linux/net/key/af_key.c
<<
>>
Prefs
   1/*
   2 * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
   3 *
   4 *              This program is free software; you can redistribute it and/or
   5 *              modify it under the terms of the GNU General Public License
   6 *              as published by the Free Software Foundation; either version
   7 *              2 of the License, or (at your option) any later version.
   8 *
   9 * Authors:     Maxim Giryaev   <gem@asplinux.ru>
  10 *              David S. Miller <davem@redhat.com>
  11 *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  12 *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  13 *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
  14 *              Derek Atkins <derek@ihtfp.com>
  15 */
  16
  17#include <linux/capability.h>
  18#include <linux/module.h>
  19#include <linux/kernel.h>
  20#include <linux/socket.h>
  21#include <linux/pfkeyv2.h>
  22#include <linux/ipsec.h>
  23#include <linux/skbuff.h>
  24#include <linux/rtnetlink.h>
  25#include <linux/in.h>
  26#include <linux/in6.h>
  27#include <linux/proc_fs.h>
  28#include <linux/init.h>
  29#include <linux/slab.h>
  30#include <net/net_namespace.h>
  31#include <net/netns/generic.h>
  32#include <net/xfrm.h>
  33
  34#include <net/sock.h>
  35
  36#define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  37#define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  38
  39static int pfkey_net_id __read_mostly;
  40struct netns_pfkey {
  41        /* List of all pfkey sockets. */
  42        struct hlist_head table;
  43        atomic_t socks_nr;
  44};
  45static DEFINE_MUTEX(pfkey_mutex);
  46
  47#define DUMMY_MARK 0
  48static struct xfrm_mark dummy_mark = {0, 0};
  49struct pfkey_sock {
  50        /* struct sock must be the first member of struct pfkey_sock */
  51        struct sock     sk;
  52        int             registered;
  53        int             promisc;
  54
  55        struct {
  56                uint8_t         msg_version;
  57                uint32_t        msg_portid;
  58                int             (*dump)(struct pfkey_sock *sk);
  59                void            (*done)(struct pfkey_sock *sk);
  60                union {
  61                        struct xfrm_policy_walk policy;
  62                        struct xfrm_state_walk  state;
  63                } u;
  64                struct sk_buff  *skb;
  65        } dump;
  66};
  67
  68static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  69{
  70        return (struct pfkey_sock *)sk;
  71}
  72
  73static int pfkey_can_dump(const struct sock *sk)
  74{
  75        if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  76                return 1;
  77        return 0;
  78}
  79
  80static void pfkey_terminate_dump(struct pfkey_sock *pfk)
  81{
  82        if (pfk->dump.dump) {
  83                if (pfk->dump.skb) {
  84                        kfree_skb(pfk->dump.skb);
  85                        pfk->dump.skb = NULL;
  86                }
  87                pfk->dump.done(pfk);
  88                pfk->dump.dump = NULL;
  89                pfk->dump.done = NULL;
  90        }
  91}
  92
  93static void pfkey_sock_destruct(struct sock *sk)
  94{
  95        struct net *net = sock_net(sk);
  96        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  97
  98        pfkey_terminate_dump(pfkey_sk(sk));
  99        skb_queue_purge(&sk->sk_receive_queue);
 100
 101        if (!sock_flag(sk, SOCK_DEAD)) {
 102                pr_err("Attempt to release alive pfkey socket: %p\n", sk);
 103                return;
 104        }
 105
 106        WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 107        WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 108
 109        atomic_dec(&net_pfkey->socks_nr);
 110}
 111
 112static const struct proto_ops pfkey_ops;
 113
 114static void pfkey_insert(struct sock *sk)
 115{
 116        struct net *net = sock_net(sk);
 117        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 118
 119        mutex_lock(&pfkey_mutex);
 120        sk_add_node_rcu(sk, &net_pfkey->table);
 121        mutex_unlock(&pfkey_mutex);
 122}
 123
 124static void pfkey_remove(struct sock *sk)
 125{
 126        mutex_lock(&pfkey_mutex);
 127        sk_del_node_init_rcu(sk);
 128        mutex_unlock(&pfkey_mutex);
 129}
 130
 131static struct proto key_proto = {
 132        .name     = "KEY",
 133        .owner    = THIS_MODULE,
 134        .obj_size = sizeof(struct pfkey_sock),
 135};
 136
 137static int pfkey_create(struct net *net, struct socket *sock, int protocol,
 138                        int kern)
 139{
 140        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 141        struct sock *sk;
 142        int err;
 143
 144        if (!capable(CAP_NET_ADMIN))
 145                return -EPERM;
 146        if (sock->type != SOCK_RAW)
 147                return -ESOCKTNOSUPPORT;
 148        if (protocol != PF_KEY_V2)
 149                return -EPROTONOSUPPORT;
 150
 151        err = -ENOMEM;
 152        sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
 153        if (sk == NULL)
 154                goto out;
 155
 156        sock->ops = &pfkey_ops;
 157        sock_init_data(sock, sk);
 158
 159        sk->sk_family = PF_KEY;
 160        sk->sk_destruct = pfkey_sock_destruct;
 161
 162        atomic_inc(&net_pfkey->socks_nr);
 163
 164        pfkey_insert(sk);
 165
 166        return 0;
 167out:
 168        return err;
 169}
 170
 171static int pfkey_release(struct socket *sock)
 172{
 173        struct sock *sk = sock->sk;
 174
 175        if (!sk)
 176                return 0;
 177
 178        pfkey_remove(sk);
 179
 180        sock_orphan(sk);
 181        sock->sk = NULL;
 182        skb_queue_purge(&sk->sk_write_queue);
 183
 184        synchronize_rcu();
 185        sock_put(sk);
 186
 187        return 0;
 188}
 189
 190static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
 191                               gfp_t allocation, struct sock *sk)
 192{
 193        int err = -ENOBUFS;
 194
 195        sock_hold(sk);
 196        if (*skb2 == NULL) {
 197                if (atomic_read(&skb->users) != 1) {
 198                        *skb2 = skb_clone(skb, allocation);
 199                } else {
 200                        *skb2 = skb;
 201                        atomic_inc(&skb->users);
 202                }
 203        }
 204        if (*skb2 != NULL) {
 205                if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 206                        skb_orphan(*skb2);
 207                        skb_set_owner_r(*skb2, sk);
 208                        skb_queue_tail(&sk->sk_receive_queue, *skb2);
 209                        sk->sk_data_ready(sk, (*skb2)->len);
 210                        *skb2 = NULL;
 211                        err = 0;
 212                }
 213        }
 214        sock_put(sk);
 215        return err;
 216}
 217
 218/* Send SKB to all pfkey sockets matching selected criteria.  */
 219#define BROADCAST_ALL           0
 220#define BROADCAST_ONE           1
 221#define BROADCAST_REGISTERED    2
 222#define BROADCAST_PROMISC_ONLY  4
 223static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 224                           int broadcast_flags, struct sock *one_sk,
 225                           struct net *net)
 226{
 227        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 228        struct sock *sk;
 229        struct hlist_node *node;
 230        struct sk_buff *skb2 = NULL;
 231        int err = -ESRCH;
 232
 233        /* XXX Do we need something like netlink_overrun?  I think
 234         * XXX PF_KEY socket apps will not mind current behavior.
 235         */
 236        if (!skb)
 237                return -ENOMEM;
 238
 239        rcu_read_lock();
 240        sk_for_each_rcu(sk, node, &net_pfkey->table) {
 241                struct pfkey_sock *pfk = pfkey_sk(sk);
 242                int err2;
 243
 244                /* Yes, it means that if you are meant to receive this
 245                 * pfkey message you receive it twice as promiscuous
 246                 * socket.
 247                 */
 248                if (pfk->promisc)
 249                        pfkey_broadcast_one(skb, &skb2, allocation, sk);
 250
 251                /* the exact target will be processed later */
 252                if (sk == one_sk)
 253                        continue;
 254                if (broadcast_flags != BROADCAST_ALL) {
 255                        if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 256                                continue;
 257                        if ((broadcast_flags & BROADCAST_REGISTERED) &&
 258                            !pfk->registered)
 259                                continue;
 260                        if (broadcast_flags & BROADCAST_ONE)
 261                                continue;
 262                }
 263
 264                err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
 265
 266                /* Error is cleare after succecful sending to at least one
 267                 * registered KM */
 268                if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 269                        err = err2;
 270        }
 271        rcu_read_unlock();
 272
 273        if (one_sk != NULL)
 274                err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 275
 276        kfree_skb(skb2);
 277        kfree_skb(skb);
 278        return err;
 279}
 280
 281static int pfkey_do_dump(struct pfkey_sock *pfk)
 282{
 283        struct sadb_msg *hdr;
 284        int rc;
 285
 286        rc = pfk->dump.dump(pfk);
 287        if (rc == -ENOBUFS)
 288                return 0;
 289
 290        if (pfk->dump.skb) {
 291                if (!pfkey_can_dump(&pfk->sk))
 292                        return 0;
 293
 294                hdr = (struct sadb_msg *) pfk->dump.skb->data;
 295                hdr->sadb_msg_seq = 0;
 296                hdr->sadb_msg_errno = rc;
 297                pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
 298                                &pfk->sk, sock_net(&pfk->sk));
 299                pfk->dump.skb = NULL;
 300        }
 301
 302        pfkey_terminate_dump(pfk);
 303        return rc;
 304}
 305
 306static inline void pfkey_hdr_dup(struct sadb_msg *new,
 307                                 const struct sadb_msg *orig)
 308{
 309        *new = *orig;
 310}
 311
 312static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 313{
 314        struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 315        struct sadb_msg *hdr;
 316
 317        if (!skb)
 318                return -ENOBUFS;
 319
 320        /* Woe be to the platform trying to support PFKEY yet
 321         * having normal errnos outside the 1-255 range, inclusive.
 322         */
 323        err = -err;
 324        if (err == ERESTARTSYS ||
 325            err == ERESTARTNOHAND ||
 326            err == ERESTARTNOINTR)
 327                err = EINTR;
 328        if (err >= 512)
 329                err = EINVAL;
 330        BUG_ON(err <= 0 || err >= 256);
 331
 332        hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 333        pfkey_hdr_dup(hdr, orig);
 334        hdr->sadb_msg_errno = (uint8_t) err;
 335        hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 336                             sizeof(uint64_t));
 337
 338        pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
 339
 340        return 0;
 341}
 342
 343static u8 sadb_ext_min_len[] = {
 344        [SADB_EXT_RESERVED]             = (u8) 0,
 345        [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 346        [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 347        [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 348        [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 349        [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 350        [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 351        [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 352        [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 353        [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 354        [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 355        [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 356        [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 357        [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 358        [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 359        [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 360        [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 361        [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 362        [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 363        [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 364        [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 365        [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 366        [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 367        [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 368        [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 369        [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 370};
 371
 372/* Verify sadb_address_{len,prefixlen} against sa_family.  */
 373static int verify_address_len(const void *p)
 374{
 375        const struct sadb_address *sp = p;
 376        const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 377        const struct sockaddr_in *sin;
 378#if IS_ENABLED(CONFIG_IPV6)
 379        const struct sockaddr_in6 *sin6;
 380#endif
 381        int len;
 382
 383        switch (addr->sa_family) {
 384        case AF_INET:
 385                len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 386                if (sp->sadb_address_len != len ||
 387                    sp->sadb_address_prefixlen > 32)
 388                        return -EINVAL;
 389                break;
 390#if IS_ENABLED(CONFIG_IPV6)
 391        case AF_INET6:
 392                len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 393                if (sp->sadb_address_len != len ||
 394                    sp->sadb_address_prefixlen > 128)
 395                        return -EINVAL;
 396                break;
 397#endif
 398        default:
 399                /* It is user using kernel to keep track of security
 400                 * associations for another protocol, such as
 401                 * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 402                 * lengths.
 403                 *
 404                 * XXX Actually, association/policy database is not yet
 405                 * XXX able to cope with arbitrary sockaddr families.
 406                 * XXX When it can, remove this -EINVAL.  -DaveM
 407                 */
 408                return -EINVAL;
 409                break;
 410        }
 411
 412        return 0;
 413}
 414
 415static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 416{
 417        return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 418                            sec_ctx->sadb_x_ctx_len,
 419                            sizeof(uint64_t));
 420}
 421
 422static inline int verify_sec_ctx_len(const void *p)
 423{
 424        const struct sadb_x_sec_ctx *sec_ctx = p;
 425        int len = sec_ctx->sadb_x_ctx_len;
 426
 427        if (len > PAGE_SIZE)
 428                return -EINVAL;
 429
 430        len = pfkey_sec_ctx_len(sec_ctx);
 431
 432        if (sec_ctx->sadb_x_sec_len != len)
 433                return -EINVAL;
 434
 435        return 0;
 436}
 437
 438static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx)
 439{
 440        struct xfrm_user_sec_ctx *uctx = NULL;
 441        int ctx_size = sec_ctx->sadb_x_ctx_len;
 442
 443        uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
 444
 445        if (!uctx)
 446                return NULL;
 447
 448        uctx->len = pfkey_sec_ctx_len(sec_ctx);
 449        uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 450        uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 451        uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 452        uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 453        memcpy(uctx + 1, sec_ctx + 1,
 454               uctx->ctx_len);
 455
 456        return uctx;
 457}
 458
 459static int present_and_same_family(const struct sadb_address *src,
 460                                   const struct sadb_address *dst)
 461{
 462        const struct sockaddr *s_addr, *d_addr;
 463
 464        if (!src || !dst)
 465                return 0;
 466
 467        s_addr = (const struct sockaddr *)(src + 1);
 468        d_addr = (const struct sockaddr *)(dst + 1);
 469        if (s_addr->sa_family != d_addr->sa_family)
 470                return 0;
 471        if (s_addr->sa_family != AF_INET
 472#if IS_ENABLED(CONFIG_IPV6)
 473            && s_addr->sa_family != AF_INET6
 474#endif
 475                )
 476                return 0;
 477
 478        return 1;
 479}
 480
 481static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 482{
 483        const char *p = (char *) hdr;
 484        int len = skb->len;
 485
 486        len -= sizeof(*hdr);
 487        p += sizeof(*hdr);
 488        while (len > 0) {
 489                const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 490                uint16_t ext_type;
 491                int ext_len;
 492
 493                ext_len  = ehdr->sadb_ext_len;
 494                ext_len *= sizeof(uint64_t);
 495                ext_type = ehdr->sadb_ext_type;
 496                if (ext_len < sizeof(uint64_t) ||
 497                    ext_len > len ||
 498                    ext_type == SADB_EXT_RESERVED)
 499                        return -EINVAL;
 500
 501                if (ext_type <= SADB_EXT_MAX) {
 502                        int min = (int) sadb_ext_min_len[ext_type];
 503                        if (ext_len < min)
 504                                return -EINVAL;
 505                        if (ext_hdrs[ext_type-1] != NULL)
 506                                return -EINVAL;
 507                        if (ext_type == SADB_EXT_ADDRESS_SRC ||
 508                            ext_type == SADB_EXT_ADDRESS_DST ||
 509                            ext_type == SADB_EXT_ADDRESS_PROXY ||
 510                            ext_type == SADB_X_EXT_NAT_T_OA) {
 511                                if (verify_address_len(p))
 512                                        return -EINVAL;
 513                        }
 514                        if (ext_type == SADB_X_EXT_SEC_CTX) {
 515                                if (verify_sec_ctx_len(p))
 516                                        return -EINVAL;
 517                        }
 518                        ext_hdrs[ext_type-1] = (void *) p;
 519                }
 520                p   += ext_len;
 521                len -= ext_len;
 522        }
 523
 524        return 0;
 525}
 526
 527static uint16_t
 528pfkey_satype2proto(uint8_t satype)
 529{
 530        switch (satype) {
 531        case SADB_SATYPE_UNSPEC:
 532                return IPSEC_PROTO_ANY;
 533        case SADB_SATYPE_AH:
 534                return IPPROTO_AH;
 535        case SADB_SATYPE_ESP:
 536                return IPPROTO_ESP;
 537        case SADB_X_SATYPE_IPCOMP:
 538                return IPPROTO_COMP;
 539                break;
 540        default:
 541                return 0;
 542        }
 543        /* NOTREACHED */
 544}
 545
 546static uint8_t
 547pfkey_proto2satype(uint16_t proto)
 548{
 549        switch (proto) {
 550        case IPPROTO_AH:
 551                return SADB_SATYPE_AH;
 552        case IPPROTO_ESP:
 553                return SADB_SATYPE_ESP;
 554        case IPPROTO_COMP:
 555                return SADB_X_SATYPE_IPCOMP;
 556                break;
 557        default:
 558                return 0;
 559        }
 560        /* NOTREACHED */
 561}
 562
 563/* BTW, this scheme means that there is no way with PFKEY2 sockets to
 564 * say specifically 'just raw sockets' as we encode them as 255.
 565 */
 566
 567static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 568{
 569        return proto == IPSEC_PROTO_ANY ? 0 : proto;
 570}
 571
 572static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 573{
 574        return proto ? proto : IPSEC_PROTO_ANY;
 575}
 576
 577static inline int pfkey_sockaddr_len(sa_family_t family)
 578{
 579        switch (family) {
 580        case AF_INET:
 581                return sizeof(struct sockaddr_in);
 582#if IS_ENABLED(CONFIG_IPV6)
 583        case AF_INET6:
 584                return sizeof(struct sockaddr_in6);
 585#endif
 586        }
 587        return 0;
 588}
 589
 590static
 591int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 592{
 593        switch (sa->sa_family) {
 594        case AF_INET:
 595                xaddr->a4 =
 596                        ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 597                return AF_INET;
 598#if IS_ENABLED(CONFIG_IPV6)
 599        case AF_INET6:
 600                memcpy(xaddr->a6,
 601                       &((struct sockaddr_in6 *)sa)->sin6_addr,
 602                       sizeof(struct in6_addr));
 603                return AF_INET6;
 604#endif
 605        }
 606        return 0;
 607}
 608
 609static
 610int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 611{
 612        return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 613                                      xaddr);
 614}
 615
 616static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 617{
 618        const struct sadb_sa *sa;
 619        const struct sadb_address *addr;
 620        uint16_t proto;
 621        unsigned short family;
 622        xfrm_address_t *xaddr;
 623
 624        sa = ext_hdrs[SADB_EXT_SA - 1];
 625        if (sa == NULL)
 626                return NULL;
 627
 628        proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 629        if (proto == 0)
 630                return NULL;
 631
 632        /* sadb_address_len should be checked by caller */
 633        addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 634        if (addr == NULL)
 635                return NULL;
 636
 637        family = ((const struct sockaddr *)(addr + 1))->sa_family;
 638        switch (family) {
 639        case AF_INET:
 640                xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 641                break;
 642#if IS_ENABLED(CONFIG_IPV6)
 643        case AF_INET6:
 644                xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 645                break;
 646#endif
 647        default:
 648                xaddr = NULL;
 649        }
 650
 651        if (!xaddr)
 652                return NULL;
 653
 654        return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 655}
 656
 657#define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 658
 659static int
 660pfkey_sockaddr_size(sa_family_t family)
 661{
 662        return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 663}
 664
 665static inline int pfkey_mode_from_xfrm(int mode)
 666{
 667        switch(mode) {
 668        case XFRM_MODE_TRANSPORT:
 669                return IPSEC_MODE_TRANSPORT;
 670        case XFRM_MODE_TUNNEL:
 671                return IPSEC_MODE_TUNNEL;
 672        case XFRM_MODE_BEET:
 673                return IPSEC_MODE_BEET;
 674        default:
 675                return -1;
 676        }
 677}
 678
 679static inline int pfkey_mode_to_xfrm(int mode)
 680{
 681        switch(mode) {
 682        case IPSEC_MODE_ANY:    /*XXX*/
 683        case IPSEC_MODE_TRANSPORT:
 684                return XFRM_MODE_TRANSPORT;
 685        case IPSEC_MODE_TUNNEL:
 686                return XFRM_MODE_TUNNEL;
 687        case IPSEC_MODE_BEET:
 688                return XFRM_MODE_BEET;
 689        default:
 690                return -1;
 691        }
 692}
 693
 694static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 695                                        struct sockaddr *sa,
 696                                        unsigned short family)
 697{
 698        switch (family) {
 699        case AF_INET:
 700            {
 701                struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 702                sin->sin_family = AF_INET;
 703                sin->sin_port = port;
 704                sin->sin_addr.s_addr = xaddr->a4;
 705                memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 706                return 32;
 707            }
 708#if IS_ENABLED(CONFIG_IPV6)
 709        case AF_INET6:
 710            {
 711                struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 712                sin6->sin6_family = AF_INET6;
 713                sin6->sin6_port = port;
 714                sin6->sin6_flowinfo = 0;
 715                sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
 716                sin6->sin6_scope_id = 0;
 717                return 128;
 718            }
 719#endif
 720        }
 721        return 0;
 722}
 723
 724static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 725                                              int add_keys, int hsc)
 726{
 727        struct sk_buff *skb;
 728        struct sadb_msg *hdr;
 729        struct sadb_sa *sa;
 730        struct sadb_lifetime *lifetime;
 731        struct sadb_address *addr;
 732        struct sadb_key *key;
 733        struct sadb_x_sa2 *sa2;
 734        struct sadb_x_sec_ctx *sec_ctx;
 735        struct xfrm_sec_ctx *xfrm_ctx;
 736        int ctx_size = 0;
 737        int size;
 738        int auth_key_size = 0;
 739        int encrypt_key_size = 0;
 740        int sockaddr_size;
 741        struct xfrm_encap_tmpl *natt = NULL;
 742        int mode;
 743
 744        /* address family check */
 745        sockaddr_size = pfkey_sockaddr_size(x->props.family);
 746        if (!sockaddr_size)
 747                return ERR_PTR(-EINVAL);
 748
 749        /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 750           key(AE), (identity(SD),) (sensitivity)> */
 751        size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 752                sizeof(struct sadb_lifetime) +
 753                ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 754                ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 755                        sizeof(struct sadb_address)*2 +
 756                                sockaddr_size*2 +
 757                                        sizeof(struct sadb_x_sa2);
 758
 759        if ((xfrm_ctx = x->security)) {
 760                ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 761                size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 762        }
 763
 764        /* identity & sensitivity */
 765        if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr, x->props.family))
 766                size += sizeof(struct sadb_address) + sockaddr_size;
 767
 768        if (add_keys) {
 769                if (x->aalg && x->aalg->alg_key_len) {
 770                        auth_key_size =
 771                                PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 772                        size += sizeof(struct sadb_key) + auth_key_size;
 773                }
 774                if (x->ealg && x->ealg->alg_key_len) {
 775                        encrypt_key_size =
 776                                PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 777                        size += sizeof(struct sadb_key) + encrypt_key_size;
 778                }
 779        }
 780        if (x->encap)
 781                natt = x->encap;
 782
 783        if (natt && natt->encap_type) {
 784                size += sizeof(struct sadb_x_nat_t_type);
 785                size += sizeof(struct sadb_x_nat_t_port);
 786                size += sizeof(struct sadb_x_nat_t_port);
 787        }
 788
 789        skb =  alloc_skb(size + 16, GFP_ATOMIC);
 790        if (skb == NULL)
 791                return ERR_PTR(-ENOBUFS);
 792
 793        /* call should fill header later */
 794        hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 795        memset(hdr, 0, size);   /* XXX do we need this ? */
 796        hdr->sadb_msg_len = size / sizeof(uint64_t);
 797
 798        /* sa */
 799        sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 800        sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 801        sa->sadb_sa_exttype = SADB_EXT_SA;
 802        sa->sadb_sa_spi = x->id.spi;
 803        sa->sadb_sa_replay = x->props.replay_window;
 804        switch (x->km.state) {
 805        case XFRM_STATE_VALID:
 806                sa->sadb_sa_state = x->km.dying ?
 807                        SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 808                break;
 809        case XFRM_STATE_ACQ:
 810                sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 811                break;
 812        default:
 813                sa->sadb_sa_state = SADB_SASTATE_DEAD;
 814                break;
 815        }
 816        sa->sadb_sa_auth = 0;
 817        if (x->aalg) {
 818                struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 819                sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
 820        }
 821        sa->sadb_sa_encrypt = 0;
 822        BUG_ON(x->ealg && x->calg);
 823        if (x->ealg) {
 824                struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 825                sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 826        }
 827        /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 828        if (x->calg) {
 829                struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 830                sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 831        }
 832
 833        sa->sadb_sa_flags = 0;
 834        if (x->props.flags & XFRM_STATE_NOECN)
 835                sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 836        if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 837                sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 838        if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 839                sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 840
 841        /* hard time */
 842        if (hsc & 2) {
 843                lifetime = (struct sadb_lifetime *)  skb_put(skb,
 844                                                             sizeof(struct sadb_lifetime));
 845                lifetime->sadb_lifetime_len =
 846                        sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 847                lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 848                lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 849                lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 850                lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 851                lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 852        }
 853        /* soft time */
 854        if (hsc & 1) {
 855                lifetime = (struct sadb_lifetime *)  skb_put(skb,
 856                                                             sizeof(struct sadb_lifetime));
 857                lifetime->sadb_lifetime_len =
 858                        sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 859                lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 860                lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 861                lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 862                lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 863                lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 864        }
 865        /* current time */
 866        lifetime = (struct sadb_lifetime *)  skb_put(skb,
 867                                                     sizeof(struct sadb_lifetime));
 868        lifetime->sadb_lifetime_len =
 869                sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 870        lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 871        lifetime->sadb_lifetime_allocations = x->curlft.packets;
 872        lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 873        lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 874        lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 875        /* src address */
 876        addr = (struct sadb_address*) skb_put(skb,
 877                                              sizeof(struct sadb_address)+sockaddr_size);
 878        addr->sadb_address_len =
 879                (sizeof(struct sadb_address)+sockaddr_size)/
 880                        sizeof(uint64_t);
 881        addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 882        /* "if the ports are non-zero, then the sadb_address_proto field,
 883           normally zero, MUST be filled in with the transport
 884           protocol's number." - RFC2367 */
 885        addr->sadb_address_proto = 0;
 886        addr->sadb_address_reserved = 0;
 887
 888        addr->sadb_address_prefixlen =
 889                pfkey_sockaddr_fill(&x->props.saddr, 0,
 890                                    (struct sockaddr *) (addr + 1),
 891                                    x->props.family);
 892        if (!addr->sadb_address_prefixlen)
 893                BUG();
 894
 895        /* dst address */
 896        addr = (struct sadb_address*) skb_put(skb,
 897                                              sizeof(struct sadb_address)+sockaddr_size);
 898        addr->sadb_address_len =
 899                (sizeof(struct sadb_address)+sockaddr_size)/
 900                        sizeof(uint64_t);
 901        addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 902        addr->sadb_address_proto = 0;
 903        addr->sadb_address_reserved = 0;
 904
 905        addr->sadb_address_prefixlen =
 906                pfkey_sockaddr_fill(&x->id.daddr, 0,
 907                                    (struct sockaddr *) (addr + 1),
 908                                    x->props.family);
 909        if (!addr->sadb_address_prefixlen)
 910                BUG();
 911
 912        if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr,
 913                          x->props.family)) {
 914                addr = (struct sadb_address*) skb_put(skb,
 915                        sizeof(struct sadb_address)+sockaddr_size);
 916                addr->sadb_address_len =
 917                        (sizeof(struct sadb_address)+sockaddr_size)/
 918                        sizeof(uint64_t);
 919                addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 920                addr->sadb_address_proto =
 921                        pfkey_proto_from_xfrm(x->sel.proto);
 922                addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 923                addr->sadb_address_reserved = 0;
 924
 925                pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 926                                    (struct sockaddr *) (addr + 1),
 927                                    x->props.family);
 928        }
 929
 930        /* auth key */
 931        if (add_keys && auth_key_size) {
 932                key = (struct sadb_key *) skb_put(skb,
 933                                                  sizeof(struct sadb_key)+auth_key_size);
 934                key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 935                        sizeof(uint64_t);
 936                key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 937                key->sadb_key_bits = x->aalg->alg_key_len;
 938                key->sadb_key_reserved = 0;
 939                memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 940        }
 941        /* encrypt key */
 942        if (add_keys && encrypt_key_size) {
 943                key = (struct sadb_key *) skb_put(skb,
 944                                                  sizeof(struct sadb_key)+encrypt_key_size);
 945                key->sadb_key_len = (sizeof(struct sadb_key) +
 946                                     encrypt_key_size) / sizeof(uint64_t);
 947                key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 948                key->sadb_key_bits = x->ealg->alg_key_len;
 949                key->sadb_key_reserved = 0;
 950                memcpy(key + 1, x->ealg->alg_key,
 951                       (x->ealg->alg_key_len+7)/8);
 952        }
 953
 954        /* sa */
 955        sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 956        sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 957        sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 958        if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 959                kfree_skb(skb);
 960                return ERR_PTR(-EINVAL);
 961        }
 962        sa2->sadb_x_sa2_mode = mode;
 963        sa2->sadb_x_sa2_reserved1 = 0;
 964        sa2->sadb_x_sa2_reserved2 = 0;
 965        sa2->sadb_x_sa2_sequence = 0;
 966        sa2->sadb_x_sa2_reqid = x->props.reqid;
 967
 968        if (natt && natt->encap_type) {
 969                struct sadb_x_nat_t_type *n_type;
 970                struct sadb_x_nat_t_port *n_port;
 971
 972                /* type */
 973                n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
 974                n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 975                n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 976                n_type->sadb_x_nat_t_type_type = natt->encap_type;
 977                n_type->sadb_x_nat_t_type_reserved[0] = 0;
 978                n_type->sadb_x_nat_t_type_reserved[1] = 0;
 979                n_type->sadb_x_nat_t_type_reserved[2] = 0;
 980
 981                /* source port */
 982                n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 983                n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 984                n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
 985                n_port->sadb_x_nat_t_port_port = natt->encap_sport;
 986                n_port->sadb_x_nat_t_port_reserved = 0;
 987
 988                /* dest port */
 989                n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 990                n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 991                n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
 992                n_port->sadb_x_nat_t_port_port = natt->encap_dport;
 993                n_port->sadb_x_nat_t_port_reserved = 0;
 994        }
 995
 996        /* security context */
 997        if (xfrm_ctx) {
 998                sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
 999                                sizeof(struct sadb_x_sec_ctx) + ctx_size);
1000                sec_ctx->sadb_x_sec_len =
1001                  (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1002                sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1003                sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1004                sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1005                sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1006                memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1007                       xfrm_ctx->ctx_len);
1008        }
1009
1010        return skb;
1011}
1012
1013
1014static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1015{
1016        struct sk_buff *skb;
1017
1018        skb = __pfkey_xfrm_state2msg(x, 1, 3);
1019
1020        return skb;
1021}
1022
1023static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1024                                                          int hsc)
1025{
1026        return __pfkey_xfrm_state2msg(x, 0, hsc);
1027}
1028
1029static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1030                                                const struct sadb_msg *hdr,
1031                                                void * const *ext_hdrs)
1032{
1033        struct xfrm_state *x;
1034        const struct sadb_lifetime *lifetime;
1035        const struct sadb_sa *sa;
1036        const struct sadb_key *key;
1037        const struct sadb_x_sec_ctx *sec_ctx;
1038        uint16_t proto;
1039        int err;
1040
1041
1042        sa = ext_hdrs[SADB_EXT_SA - 1];
1043        if (!sa ||
1044            !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1045                                     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1046                return ERR_PTR(-EINVAL);
1047        if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1048            !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1049                return ERR_PTR(-EINVAL);
1050        if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1051            !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1052                return ERR_PTR(-EINVAL);
1053        if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1054            !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1055                return ERR_PTR(-EINVAL);
1056
1057        proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1058        if (proto == 0)
1059                return ERR_PTR(-EINVAL);
1060
1061        /* default error is no buffer space */
1062        err = -ENOBUFS;
1063
1064        /* RFC2367:
1065
1066   Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1067   SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1068   sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1069   Therefore, the sadb_sa_state field of all submitted SAs MUST be
1070   SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1071   not true.
1072
1073           However, KAME setkey always uses SADB_SASTATE_LARVAL.
1074           Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1075         */
1076        if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1077            (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1078             sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1079            sa->sadb_sa_encrypt > SADB_EALG_MAX)
1080                return ERR_PTR(-EINVAL);
1081        key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1082        if (key != NULL &&
1083            sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1084            ((key->sadb_key_bits+7) / 8 == 0 ||
1085             (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1086                return ERR_PTR(-EINVAL);
1087        key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1088        if (key != NULL &&
1089            sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1090            ((key->sadb_key_bits+7) / 8 == 0 ||
1091             (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1092                return ERR_PTR(-EINVAL);
1093
1094        x = xfrm_state_alloc(net);
1095        if (x == NULL)
1096                return ERR_PTR(-ENOBUFS);
1097
1098        x->id.proto = proto;
1099        x->id.spi = sa->sadb_sa_spi;
1100        x->props.replay_window = sa->sadb_sa_replay;
1101        if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1102                x->props.flags |= XFRM_STATE_NOECN;
1103        if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1104                x->props.flags |= XFRM_STATE_DECAP_DSCP;
1105        if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1106                x->props.flags |= XFRM_STATE_NOPMTUDISC;
1107
1108        lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1109        if (lifetime != NULL) {
1110                x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1111                x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1112                x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1113                x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1114        }
1115        lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1116        if (lifetime != NULL) {
1117                x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1118                x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1119                x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1120                x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1121        }
1122
1123        sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1124        if (sec_ctx != NULL) {
1125                struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1126
1127                if (!uctx)
1128                        goto out;
1129
1130                err = security_xfrm_state_alloc(x, uctx);
1131                kfree(uctx);
1132
1133                if (err)
1134                        goto out;
1135        }
1136
1137        key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1138        if (sa->sadb_sa_auth) {
1139                int keysize = 0;
1140                struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1141                if (!a) {
1142                        err = -ENOSYS;
1143                        goto out;
1144                }
1145                if (key)
1146                        keysize = (key->sadb_key_bits + 7) / 8;
1147                x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1148                if (!x->aalg)
1149                        goto out;
1150                strcpy(x->aalg->alg_name, a->name);
1151                x->aalg->alg_key_len = 0;
1152                if (key) {
1153                        x->aalg->alg_key_len = key->sadb_key_bits;
1154                        memcpy(x->aalg->alg_key, key+1, keysize);
1155                }
1156                x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1157                x->props.aalgo = sa->sadb_sa_auth;
1158                /* x->algo.flags = sa->sadb_sa_flags; */
1159        }
1160        if (sa->sadb_sa_encrypt) {
1161                if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1162                        struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1163                        if (!a) {
1164                                err = -ENOSYS;
1165                                goto out;
1166                        }
1167                        x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1168                        if (!x->calg)
1169                                goto out;
1170                        strcpy(x->calg->alg_name, a->name);
1171                        x->props.calgo = sa->sadb_sa_encrypt;
1172                } else {
1173                        int keysize = 0;
1174                        struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1175                        if (!a) {
1176                                err = -ENOSYS;
1177                                goto out;
1178                        }
1179                        key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1180                        if (key)
1181                                keysize = (key->sadb_key_bits + 7) / 8;
1182                        x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1183                        if (!x->ealg)
1184                                goto out;
1185                        strcpy(x->ealg->alg_name, a->name);
1186                        x->ealg->alg_key_len = 0;
1187                        if (key) {
1188                                x->ealg->alg_key_len = key->sadb_key_bits;
1189                                memcpy(x->ealg->alg_key, key+1, keysize);
1190                        }
1191                        x->props.ealgo = sa->sadb_sa_encrypt;
1192                }
1193        }
1194        /* x->algo.flags = sa->sadb_sa_flags; */
1195
1196        x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1197                                                    &x->props.saddr);
1198        if (!x->props.family) {
1199                err = -EAFNOSUPPORT;
1200                goto out;
1201        }
1202        pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1203                                  &x->id.daddr);
1204
1205        if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1206                const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1207                int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1208                if (mode < 0) {
1209                        err = -EINVAL;
1210                        goto out;
1211                }
1212                x->props.mode = mode;
1213                x->props.reqid = sa2->sadb_x_sa2_reqid;
1214        }
1215
1216        if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1217                const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1218
1219                /* Nobody uses this, but we try. */
1220                x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1221                x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1222        }
1223
1224        if (!x->sel.family)
1225                x->sel.family = x->props.family;
1226
1227        if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1228                const struct sadb_x_nat_t_type* n_type;
1229                struct xfrm_encap_tmpl *natt;
1230
1231                x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1232                if (!x->encap)
1233                        goto out;
1234
1235                natt = x->encap;
1236                n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1237                natt->encap_type = n_type->sadb_x_nat_t_type_type;
1238
1239                if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1240                        const struct sadb_x_nat_t_port *n_port =
1241                                ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1242                        natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1243                }
1244                if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1245                        const struct sadb_x_nat_t_port *n_port =
1246                                ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1247                        natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1248                }
1249                memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1250        }
1251
1252        err = xfrm_init_state(x);
1253        if (err)
1254                goto out;
1255
1256        x->km.seq = hdr->sadb_msg_seq;
1257        return x;
1258
1259out:
1260        x->km.state = XFRM_STATE_DEAD;
1261        xfrm_state_put(x);
1262        return ERR_PTR(err);
1263}
1264
1265static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1266{
1267        return -EOPNOTSUPP;
1268}
1269
1270static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1271{
1272        struct net *net = sock_net(sk);
1273        struct sk_buff *resp_skb;
1274        struct sadb_x_sa2 *sa2;
1275        struct sadb_address *saddr, *daddr;
1276        struct sadb_msg *out_hdr;
1277        struct sadb_spirange *range;
1278        struct xfrm_state *x = NULL;
1279        int mode;
1280        int err;
1281        u32 min_spi, max_spi;
1282        u32 reqid;
1283        u8 proto;
1284        unsigned short family;
1285        xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1286
1287        if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1288                                     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1289                return -EINVAL;
1290
1291        proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1292        if (proto == 0)
1293                return -EINVAL;
1294
1295        if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1296                mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1297                if (mode < 0)
1298                        return -EINVAL;
1299                reqid = sa2->sadb_x_sa2_reqid;
1300        } else {
1301                mode = 0;
1302                reqid = 0;
1303        }
1304
1305        saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1306        daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1307
1308        family = ((struct sockaddr *)(saddr + 1))->sa_family;
1309        switch (family) {
1310        case AF_INET:
1311                xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1312                xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1313                break;
1314#if IS_ENABLED(CONFIG_IPV6)
1315        case AF_INET6:
1316                xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1317                xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1318                break;
1319#endif
1320        }
1321
1322        if (hdr->sadb_msg_seq) {
1323                x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1324                if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1325                        xfrm_state_put(x);
1326                        x = NULL;
1327                }
1328        }
1329
1330        if (!x)
1331                x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1332
1333        if (x == NULL)
1334                return -ENOENT;
1335
1336        min_spi = 0x100;
1337        max_spi = 0x0fffffff;
1338
1339        range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1340        if (range) {
1341                min_spi = range->sadb_spirange_min;
1342                max_spi = range->sadb_spirange_max;
1343        }
1344
1345        err = xfrm_alloc_spi(x, min_spi, max_spi);
1346        resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1347
1348        if (IS_ERR(resp_skb)) {
1349                xfrm_state_put(x);
1350                return  PTR_ERR(resp_skb);
1351        }
1352
1353        out_hdr = (struct sadb_msg *) resp_skb->data;
1354        out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1355        out_hdr->sadb_msg_type = SADB_GETSPI;
1356        out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1357        out_hdr->sadb_msg_errno = 0;
1358        out_hdr->sadb_msg_reserved = 0;
1359        out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1360        out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1361
1362        xfrm_state_put(x);
1363
1364        pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1365
1366        return 0;
1367}
1368
1369static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1370{
1371        struct net *net = sock_net(sk);
1372        struct xfrm_state *x;
1373
1374        if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1375                return -EOPNOTSUPP;
1376
1377        if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1378                return 0;
1379
1380        x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1381        if (x == NULL)
1382                return 0;
1383
1384        spin_lock_bh(&x->lock);
1385        if (x->km.state == XFRM_STATE_ACQ) {
1386                x->km.state = XFRM_STATE_ERROR;
1387                wake_up(&net->xfrm.km_waitq);
1388        }
1389        spin_unlock_bh(&x->lock);
1390        xfrm_state_put(x);
1391        return 0;
1392}
1393
1394static inline int event2poltype(int event)
1395{
1396        switch (event) {
1397        case XFRM_MSG_DELPOLICY:
1398                return SADB_X_SPDDELETE;
1399        case XFRM_MSG_NEWPOLICY:
1400                return SADB_X_SPDADD;
1401        case XFRM_MSG_UPDPOLICY:
1402                return SADB_X_SPDUPDATE;
1403        case XFRM_MSG_POLEXPIRE:
1404        //      return SADB_X_SPDEXPIRE;
1405        default:
1406                pr_err("pfkey: Unknown policy event %d\n", event);
1407                break;
1408        }
1409
1410        return 0;
1411}
1412
1413static inline int event2keytype(int event)
1414{
1415        switch (event) {
1416        case XFRM_MSG_DELSA:
1417                return SADB_DELETE;
1418        case XFRM_MSG_NEWSA:
1419                return SADB_ADD;
1420        case XFRM_MSG_UPDSA:
1421                return SADB_UPDATE;
1422        case XFRM_MSG_EXPIRE:
1423                return SADB_EXPIRE;
1424        default:
1425                pr_err("pfkey: Unknown SA event %d\n", event);
1426                break;
1427        }
1428
1429        return 0;
1430}
1431
1432/* ADD/UPD/DEL */
1433static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1434{
1435        struct sk_buff *skb;
1436        struct sadb_msg *hdr;
1437
1438        skb = pfkey_xfrm_state2msg(x);
1439
1440        if (IS_ERR(skb))
1441                return PTR_ERR(skb);
1442
1443        hdr = (struct sadb_msg *) skb->data;
1444        hdr->sadb_msg_version = PF_KEY_V2;
1445        hdr->sadb_msg_type = event2keytype(c->event);
1446        hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1447        hdr->sadb_msg_errno = 0;
1448        hdr->sadb_msg_reserved = 0;
1449        hdr->sadb_msg_seq = c->seq;
1450        hdr->sadb_msg_pid = c->portid;
1451
1452        pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1453
1454        return 0;
1455}
1456
1457static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1458{
1459        struct net *net = sock_net(sk);
1460        struct xfrm_state *x;
1461        int err;
1462        struct km_event c;
1463
1464        x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1465        if (IS_ERR(x))
1466                return PTR_ERR(x);
1467
1468        xfrm_state_hold(x);
1469        if (hdr->sadb_msg_type == SADB_ADD)
1470                err = xfrm_state_add(x);
1471        else
1472                err = xfrm_state_update(x);
1473
1474        xfrm_audit_state_add(x, err ? 0 : 1,
1475                             audit_get_loginuid(current),
1476                             audit_get_sessionid(current), 0);
1477
1478        if (err < 0) {
1479                x->km.state = XFRM_STATE_DEAD;
1480                __xfrm_state_put(x);
1481                goto out;
1482        }
1483
1484        if (hdr->sadb_msg_type == SADB_ADD)
1485                c.event = XFRM_MSG_NEWSA;
1486        else
1487                c.event = XFRM_MSG_UPDSA;
1488        c.seq = hdr->sadb_msg_seq;
1489        c.portid = hdr->sadb_msg_pid;
1490        km_state_notify(x, &c);
1491out:
1492        xfrm_state_put(x);
1493        return err;
1494}
1495
1496static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1497{
1498        struct net *net = sock_net(sk);
1499        struct xfrm_state *x;
1500        struct km_event c;
1501        int err;
1502
1503        if (!ext_hdrs[SADB_EXT_SA-1] ||
1504            !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1505                                     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1506                return -EINVAL;
1507
1508        x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1509        if (x == NULL)
1510                return -ESRCH;
1511
1512        if ((err = security_xfrm_state_delete(x)))
1513                goto out;
1514
1515        if (xfrm_state_kern(x)) {
1516                err = -EPERM;
1517                goto out;
1518        }
1519
1520        err = xfrm_state_delete(x);
1521
1522        if (err < 0)
1523                goto out;
1524
1525        c.seq = hdr->sadb_msg_seq;
1526        c.portid = hdr->sadb_msg_pid;
1527        c.event = XFRM_MSG_DELSA;
1528        km_state_notify(x, &c);
1529out:
1530        xfrm_audit_state_delete(x, err ? 0 : 1,
1531                                audit_get_loginuid(current),
1532                                audit_get_sessionid(current), 0);
1533        xfrm_state_put(x);
1534
1535        return err;
1536}
1537
1538static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1539{
1540        struct net *net = sock_net(sk);
1541        __u8 proto;
1542        struct sk_buff *out_skb;
1543        struct sadb_msg *out_hdr;
1544        struct xfrm_state *x;
1545
1546        if (!ext_hdrs[SADB_EXT_SA-1] ||
1547            !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1548                                     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1549                return -EINVAL;
1550
1551        x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1552        if (x == NULL)
1553                return -ESRCH;
1554
1555        out_skb = pfkey_xfrm_state2msg(x);
1556        proto = x->id.proto;
1557        xfrm_state_put(x);
1558        if (IS_ERR(out_skb))
1559                return  PTR_ERR(out_skb);
1560
1561        out_hdr = (struct sadb_msg *) out_skb->data;
1562        out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1563        out_hdr->sadb_msg_type = SADB_GET;
1564        out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1565        out_hdr->sadb_msg_errno = 0;
1566        out_hdr->sadb_msg_reserved = 0;
1567        out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1568        out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1569        pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1570
1571        return 0;
1572}
1573
1574static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1575                                              gfp_t allocation)
1576{
1577        struct sk_buff *skb;
1578        struct sadb_msg *hdr;
1579        int len, auth_len, enc_len, i;
1580
1581        auth_len = xfrm_count_auth_supported();
1582        if (auth_len) {
1583                auth_len *= sizeof(struct sadb_alg);
1584                auth_len += sizeof(struct sadb_supported);
1585        }
1586
1587        enc_len = xfrm_count_enc_supported();
1588        if (enc_len) {
1589                enc_len *= sizeof(struct sadb_alg);
1590                enc_len += sizeof(struct sadb_supported);
1591        }
1592
1593        len = enc_len + auth_len + sizeof(struct sadb_msg);
1594
1595        skb = alloc_skb(len + 16, allocation);
1596        if (!skb)
1597                goto out_put_algs;
1598
1599        hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1600        pfkey_hdr_dup(hdr, orig);
1601        hdr->sadb_msg_errno = 0;
1602        hdr->sadb_msg_len = len / sizeof(uint64_t);
1603
1604        if (auth_len) {
1605                struct sadb_supported *sp;
1606                struct sadb_alg *ap;
1607
1608                sp = (struct sadb_supported *) skb_put(skb, auth_len);
1609                ap = (struct sadb_alg *) (sp + 1);
1610
1611                sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1612                sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1613
1614                for (i = 0; ; i++) {
1615                        struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1616                        if (!aalg)
1617                                break;
1618                        if (aalg->available)
1619                                *ap++ = aalg->desc;
1620                }
1621        }
1622
1623        if (enc_len) {
1624                struct sadb_supported *sp;
1625                struct sadb_alg *ap;
1626
1627                sp = (struct sadb_supported *) skb_put(skb, enc_len);
1628                ap = (struct sadb_alg *) (sp + 1);
1629
1630                sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1631                sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1632
1633                for (i = 0; ; i++) {
1634                        struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1635                        if (!ealg)
1636                                break;
1637                        if (ealg->available)
1638                                *ap++ = ealg->desc;
1639                }
1640        }
1641
1642out_put_algs:
1643        return skb;
1644}
1645
1646static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1647{
1648        struct pfkey_sock *pfk = pfkey_sk(sk);
1649        struct sk_buff *supp_skb;
1650
1651        if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1652                return -EINVAL;
1653
1654        if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1655                if (pfk->registered&(1<<hdr->sadb_msg_satype))
1656                        return -EEXIST;
1657                pfk->registered |= (1<<hdr->sadb_msg_satype);
1658        }
1659
1660        xfrm_probe_algs();
1661
1662        supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1663        if (!supp_skb) {
1664                if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1665                        pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1666
1667                return -ENOBUFS;
1668        }
1669
1670        pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1671
1672        return 0;
1673}
1674
1675static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1676{
1677        struct sk_buff *skb;
1678        struct sadb_msg *hdr;
1679
1680        skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1681        if (!skb)
1682                return -ENOBUFS;
1683
1684        hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1685        memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1686        hdr->sadb_msg_errno = (uint8_t) 0;
1687        hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1688
1689        return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1690}
1691
1692static int key_notify_sa_flush(const struct km_event *c)
1693{
1694        struct sk_buff *skb;
1695        struct sadb_msg *hdr;
1696
1697        skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1698        if (!skb)
1699                return -ENOBUFS;
1700        hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1701        hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1702        hdr->sadb_msg_type = SADB_FLUSH;
1703        hdr->sadb_msg_seq = c->seq;
1704        hdr->sadb_msg_pid = c->portid;
1705        hdr->sadb_msg_version = PF_KEY_V2;
1706        hdr->sadb_msg_errno = (uint8_t) 0;
1707        hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1708
1709        pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1710
1711        return 0;
1712}
1713
1714static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1715{
1716        struct net *net = sock_net(sk);
1717        unsigned int proto;
1718        struct km_event c;
1719        struct xfrm_audit audit_info;
1720        int err, err2;
1721
1722        proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1723        if (proto == 0)
1724                return -EINVAL;
1725
1726        audit_info.loginuid = audit_get_loginuid(current);
1727        audit_info.sessionid = audit_get_sessionid(current);
1728        audit_info.secid = 0;
1729        err = xfrm_state_flush(net, proto, &audit_info);
1730        err2 = unicast_flush_resp(sk, hdr);
1731        if (err || err2) {
1732                if (err == -ESRCH) /* empty table - go quietly */
1733                        err = 0;
1734                return err ? err : err2;
1735        }
1736
1737        c.data.proto = proto;
1738        c.seq = hdr->sadb_msg_seq;
1739        c.portid = hdr->sadb_msg_pid;
1740        c.event = XFRM_MSG_FLUSHSA;
1741        c.net = net;
1742        km_state_notify(NULL, &c);
1743
1744        return 0;
1745}
1746
1747static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1748{
1749        struct pfkey_sock *pfk = ptr;
1750        struct sk_buff *out_skb;
1751        struct sadb_msg *out_hdr;
1752
1753        if (!pfkey_can_dump(&pfk->sk))
1754                return -ENOBUFS;
1755
1756        out_skb = pfkey_xfrm_state2msg(x);
1757        if (IS_ERR(out_skb))
1758                return PTR_ERR(out_skb);
1759
1760        out_hdr = (struct sadb_msg *) out_skb->data;
1761        out_hdr->sadb_msg_version = pfk->dump.msg_version;
1762        out_hdr->sadb_msg_type = SADB_DUMP;
1763        out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1764        out_hdr->sadb_msg_errno = 0;
1765        out_hdr->sadb_msg_reserved = 0;
1766        out_hdr->sadb_msg_seq = count + 1;
1767        out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1768
1769        if (pfk->dump.skb)
1770                pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1771                                &pfk->sk, sock_net(&pfk->sk));
1772        pfk->dump.skb = out_skb;
1773
1774        return 0;
1775}
1776
1777static int pfkey_dump_sa(struct pfkey_sock *pfk)
1778{
1779        struct net *net = sock_net(&pfk->sk);
1780        return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1781}
1782
1783static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1784{
1785        xfrm_state_walk_done(&pfk->dump.u.state);
1786}
1787
1788static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1789{
1790        u8 proto;
1791        struct pfkey_sock *pfk = pfkey_sk(sk);
1792
1793        if (pfk->dump.dump != NULL)
1794                return -EBUSY;
1795
1796        proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1797        if (proto == 0)
1798                return -EINVAL;
1799
1800        pfk->dump.msg_version = hdr->sadb_msg_version;
1801        pfk->dump.msg_portid = hdr->sadb_msg_pid;
1802        pfk->dump.dump = pfkey_dump_sa;
1803        pfk->dump.done = pfkey_dump_sa_done;
1804        xfrm_state_walk_init(&pfk->dump.u.state, proto);
1805
1806        return pfkey_do_dump(pfk);
1807}
1808
1809static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1810{
1811        struct pfkey_sock *pfk = pfkey_sk(sk);
1812        int satype = hdr->sadb_msg_satype;
1813        bool reset_errno = false;
1814
1815        if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1816                reset_errno = true;
1817                if (satype != 0 && satype != 1)
1818                        return -EINVAL;
1819                pfk->promisc = satype;
1820        }
1821        if (reset_errno && skb_cloned(skb))
1822                skb = skb_copy(skb, GFP_KERNEL);
1823        else
1824                skb = skb_clone(skb, GFP_KERNEL);
1825
1826        if (reset_errno && skb) {
1827                struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1828                new_hdr->sadb_msg_errno = 0;
1829        }
1830
1831        pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1832        return 0;
1833}
1834
1835static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1836{
1837        int i;
1838        u32 reqid = *(u32*)ptr;
1839
1840        for (i=0; i<xp->xfrm_nr; i++) {
1841                if (xp->xfrm_vec[i].reqid == reqid)
1842                        return -EEXIST;
1843        }
1844        return 0;
1845}
1846
1847static u32 gen_reqid(struct net *net)
1848{
1849        struct xfrm_policy_walk walk;
1850        u32 start;
1851        int rc;
1852        static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1853
1854        start = reqid;
1855        do {
1856                ++reqid;
1857                if (reqid == 0)
1858                        reqid = IPSEC_MANUAL_REQID_MAX+1;
1859                xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1860                rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1861                xfrm_policy_walk_done(&walk);
1862                if (rc != -EEXIST)
1863                        return reqid;
1864        } while (reqid != start);
1865        return 0;
1866}
1867
1868static int
1869parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1870{
1871        struct net *net = xp_net(xp);
1872        struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1873        int mode;
1874
1875        if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1876                return -ELOOP;
1877
1878        if (rq->sadb_x_ipsecrequest_mode == 0)
1879                return -EINVAL;
1880
1881        t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1882        if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1883                return -EINVAL;
1884        t->mode = mode;
1885        if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1886                t->optional = 1;
1887        else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1888                t->reqid = rq->sadb_x_ipsecrequest_reqid;
1889                if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1890                        t->reqid = 0;
1891                if (!t->reqid && !(t->reqid = gen_reqid(net)))
1892                        return -ENOBUFS;
1893        }
1894
1895        /* addresses present only in tunnel mode */
1896        if (t->mode == XFRM_MODE_TUNNEL) {
1897                u8 *sa = (u8 *) (rq + 1);
1898                int family, socklen;
1899
1900                family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1901                                                &t->saddr);
1902                if (!family)
1903                        return -EINVAL;
1904
1905                socklen = pfkey_sockaddr_len(family);
1906                if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1907                                           &t->id.daddr) != family)
1908                        return -EINVAL;
1909                t->encap_family = family;
1910        } else
1911                t->encap_family = xp->family;
1912
1913        /* No way to set this via kame pfkey */
1914        t->allalgs = 1;
1915        xp->xfrm_nr++;
1916        return 0;
1917}
1918
1919static int
1920parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1921{
1922        int err;
1923        int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1924        struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1925
1926        if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1927                return -EINVAL;
1928
1929        while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1930                if ((err = parse_ipsecrequest(xp, rq)) < 0)
1931                        return err;
1932                len -= rq->sadb_x_ipsecrequest_len;
1933                rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1934        }
1935        return 0;
1936}
1937
1938static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1939{
1940  struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1941
1942        if (xfrm_ctx) {
1943                int len = sizeof(struct sadb_x_sec_ctx);
1944                len += xfrm_ctx->ctx_len;
1945                return PFKEY_ALIGN8(len);
1946        }
1947        return 0;
1948}
1949
1950static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1951{
1952        const struct xfrm_tmpl *t;
1953        int sockaddr_size = pfkey_sockaddr_size(xp->family);
1954        int socklen = 0;
1955        int i;
1956
1957        for (i=0; i<xp->xfrm_nr; i++) {
1958                t = xp->xfrm_vec + i;
1959                socklen += pfkey_sockaddr_len(t->encap_family);
1960        }
1961
1962        return sizeof(struct sadb_msg) +
1963                (sizeof(struct sadb_lifetime) * 3) +
1964                (sizeof(struct sadb_address) * 2) +
1965                (sockaddr_size * 2) +
1966                sizeof(struct sadb_x_policy) +
1967                (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1968                (socklen * 2) +
1969                pfkey_xfrm_policy2sec_ctx_size(xp);
1970}
1971
1972static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1973{
1974        struct sk_buff *skb;
1975        int size;
1976
1977        size = pfkey_xfrm_policy2msg_size(xp);
1978
1979        skb =  alloc_skb(size + 16, GFP_ATOMIC);
1980        if (skb == NULL)
1981                return ERR_PTR(-ENOBUFS);
1982
1983        return skb;
1984}
1985
1986static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1987{
1988        struct sadb_msg *hdr;
1989        struct sadb_address *addr;
1990        struct sadb_lifetime *lifetime;
1991        struct sadb_x_policy *pol;
1992        struct sadb_x_sec_ctx *sec_ctx;
1993        struct xfrm_sec_ctx *xfrm_ctx;
1994        int i;
1995        int size;
1996        int sockaddr_size = pfkey_sockaddr_size(xp->family);
1997        int socklen = pfkey_sockaddr_len(xp->family);
1998
1999        size = pfkey_xfrm_policy2msg_size(xp);
2000
2001        /* call should fill header later */
2002        hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2003        memset(hdr, 0, size);   /* XXX do we need this ? */
2004
2005        /* src address */
2006        addr = (struct sadb_address*) skb_put(skb,
2007                                              sizeof(struct sadb_address)+sockaddr_size);
2008        addr->sadb_address_len =
2009                (sizeof(struct sadb_address)+sockaddr_size)/
2010                        sizeof(uint64_t);
2011        addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2012        addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2013        addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2014        addr->sadb_address_reserved = 0;
2015        if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2016                                 xp->selector.sport,
2017                                 (struct sockaddr *) (addr + 1),
2018                                 xp->family))
2019                BUG();
2020
2021        /* dst address */
2022        addr = (struct sadb_address*) skb_put(skb,
2023                                              sizeof(struct sadb_address)+sockaddr_size);
2024        addr->sadb_address_len =
2025                (sizeof(struct sadb_address)+sockaddr_size)/
2026                        sizeof(uint64_t);
2027        addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2028        addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2029        addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2030        addr->sadb_address_reserved = 0;
2031
2032        pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2033                            (struct sockaddr *) (addr + 1),
2034                            xp->family);
2035
2036        /* hard time */
2037        lifetime = (struct sadb_lifetime *)  skb_put(skb,
2038                                                     sizeof(struct sadb_lifetime));
2039        lifetime->sadb_lifetime_len =
2040                sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2041        lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2042        lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2043        lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2044        lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2045        lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2046        /* soft time */
2047        lifetime = (struct sadb_lifetime *)  skb_put(skb,
2048                                                     sizeof(struct sadb_lifetime));
2049        lifetime->sadb_lifetime_len =
2050                sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2051        lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2052        lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2053        lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2054        lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2055        lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2056        /* current time */
2057        lifetime = (struct sadb_lifetime *)  skb_put(skb,
2058                                                     sizeof(struct sadb_lifetime));
2059        lifetime->sadb_lifetime_len =
2060                sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2061        lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2062        lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2063        lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2064        lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2065        lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2066
2067        pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2068        pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2069        pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2070        pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2071        if (xp->action == XFRM_POLICY_ALLOW) {
2072                if (xp->xfrm_nr)
2073                        pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2074                else
2075                        pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2076        }
2077        pol->sadb_x_policy_dir = dir+1;
2078        pol->sadb_x_policy_id = xp->index;
2079        pol->sadb_x_policy_priority = xp->priority;
2080
2081        for (i=0; i<xp->xfrm_nr; i++) {
2082                const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2083                struct sadb_x_ipsecrequest *rq;
2084                int req_size;
2085                int mode;
2086
2087                req_size = sizeof(struct sadb_x_ipsecrequest);
2088                if (t->mode == XFRM_MODE_TUNNEL) {
2089                        socklen = pfkey_sockaddr_len(t->encap_family);
2090                        req_size += socklen * 2;
2091                } else {
2092                        size -= 2*socklen;
2093                }
2094                rq = (void*)skb_put(skb, req_size);
2095                pol->sadb_x_policy_len += req_size/8;
2096                memset(rq, 0, sizeof(*rq));
2097                rq->sadb_x_ipsecrequest_len = req_size;
2098                rq->sadb_x_ipsecrequest_proto = t->id.proto;
2099                if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2100                        return -EINVAL;
2101                rq->sadb_x_ipsecrequest_mode = mode;
2102                rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2103                if (t->reqid)
2104                        rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2105                if (t->optional)
2106                        rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2107                rq->sadb_x_ipsecrequest_reqid = t->reqid;
2108
2109                if (t->mode == XFRM_MODE_TUNNEL) {
2110                        u8 *sa = (void *)(rq + 1);
2111                        pfkey_sockaddr_fill(&t->saddr, 0,
2112                                            (struct sockaddr *)sa,
2113                                            t->encap_family);
2114                        pfkey_sockaddr_fill(&t->id.daddr, 0,
2115                                            (struct sockaddr *) (sa + socklen),
2116                                            t->encap_family);
2117                }
2118        }
2119
2120        /* security context */
2121        if ((xfrm_ctx = xp->security)) {
2122                int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2123
2124                sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2125                sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2126                sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2127                sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2128                sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2129                sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2130                memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2131                       xfrm_ctx->ctx_len);
2132        }
2133
2134        hdr->sadb_msg_len = size / sizeof(uint64_t);
2135        hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2136
2137        return 0;
2138}
2139
2140static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2141{
2142        struct sk_buff *out_skb;
2143        struct sadb_msg *out_hdr;
2144        int err;
2145
2146        out_skb = pfkey_xfrm_policy2msg_prep(xp);
2147        if (IS_ERR(out_skb))
2148                return PTR_ERR(out_skb);
2149
2150        err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2151        if (err < 0)
2152                return err;
2153
2154        out_hdr = (struct sadb_msg *) out_skb->data;
2155        out_hdr->sadb_msg_version = PF_KEY_V2;
2156
2157        if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2158                out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2159        else
2160                out_hdr->sadb_msg_type = event2poltype(c->event);
2161        out_hdr->sadb_msg_errno = 0;
2162        out_hdr->sadb_msg_seq = c->seq;
2163        out_hdr->sadb_msg_pid = c->portid;
2164        pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2165        return 0;
2166
2167}
2168
2169static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2170{
2171        struct net *net = sock_net(sk);
2172        int err = 0;
2173        struct sadb_lifetime *lifetime;
2174        struct sadb_address *sa;
2175        struct sadb_x_policy *pol;
2176        struct xfrm_policy *xp;
2177        struct km_event c;
2178        struct sadb_x_sec_ctx *sec_ctx;
2179
2180        if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2181                                     ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2182            !ext_hdrs[SADB_X_EXT_POLICY-1])
2183                return -EINVAL;
2184
2185        pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2186        if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2187                return -EINVAL;
2188        if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2189                return -EINVAL;
2190
2191        xp = xfrm_policy_alloc(net, GFP_KERNEL);
2192        if (xp == NULL)
2193                return -ENOBUFS;
2194
2195        xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2196                      XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2197        xp->priority = pol->sadb_x_policy_priority;
2198
2199        sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2200        xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2201        if (!xp->family) {
2202                err = -EINVAL;
2203                goto out;
2204        }
2205        xp->selector.family = xp->family;
2206        xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2207        xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2208        xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2209        if (xp->selector.sport)
2210                xp->selector.sport_mask = htons(0xffff);
2211
2212        sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2213        pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2214        xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2215
2216        /* Amusing, we set this twice.  KAME apps appear to set same value
2217         * in both addresses.
2218         */
2219        xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2220
2221        xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2222        if (xp->selector.dport)
2223                xp->selector.dport_mask = htons(0xffff);
2224
2225        sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2226        if (sec_ctx != NULL) {
2227                struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2228
2229                if (!uctx) {
2230                        err = -ENOBUFS;
2231                        goto out;
2232                }
2233
2234                err = security_xfrm_policy_alloc(&xp->security, uctx);
2235                kfree(uctx);
2236
2237                if (err)
2238                        goto out;
2239        }
2240
2241        xp->lft.soft_byte_limit = XFRM_INF;
2242        xp->lft.hard_byte_limit = XFRM_INF;
2243        xp->lft.soft_packet_limit = XFRM_INF;
2244        xp->lft.hard_packet_limit = XFRM_INF;
2245        if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2246                xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2247                xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2248                xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2249                xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2250        }
2251        if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2252                xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2253                xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2254                xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2255                xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2256        }
2257        xp->xfrm_nr = 0;
2258        if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2259            (err = parse_ipsecrequests(xp, pol)) < 0)
2260                goto out;
2261
2262        err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2263                                 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2264
2265        xfrm_audit_policy_add(xp, err ? 0 : 1,
2266                              audit_get_loginuid(current),
2267                              audit_get_sessionid(current), 0);
2268
2269        if (err)
2270                goto out;
2271
2272        if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2273                c.event = XFRM_MSG_UPDPOLICY;
2274        else
2275                c.event = XFRM_MSG_NEWPOLICY;
2276
2277        c.seq = hdr->sadb_msg_seq;
2278        c.portid = hdr->sadb_msg_pid;
2279
2280        km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2281        xfrm_pol_put(xp);
2282        return 0;
2283
2284out:
2285        xp->walk.dead = 1;
2286        xfrm_policy_destroy(xp);
2287        return err;
2288}
2289
2290static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2291{
2292        struct net *net = sock_net(sk);
2293        int err;
2294        struct sadb_address *sa;
2295        struct sadb_x_policy *pol;
2296        struct xfrm_policy *xp;
2297        struct xfrm_selector sel;
2298        struct km_event c;
2299        struct sadb_x_sec_ctx *sec_ctx;
2300        struct xfrm_sec_ctx *pol_ctx = NULL;
2301
2302        if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2303                                     ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2304            !ext_hdrs[SADB_X_EXT_POLICY-1])
2305                return -EINVAL;
2306
2307        pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2308        if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2309                return -EINVAL;
2310
2311        memset(&sel, 0, sizeof(sel));
2312
2313        sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2314        sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2315        sel.prefixlen_s = sa->sadb_address_prefixlen;
2316        sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2317        sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2318        if (sel.sport)
2319                sel.sport_mask = htons(0xffff);
2320
2321        sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2322        pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2323        sel.prefixlen_d = sa->sadb_address_prefixlen;
2324        sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2325        sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2326        if (sel.dport)
2327                sel.dport_mask = htons(0xffff);
2328
2329        sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2330        if (sec_ctx != NULL) {
2331                struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2332
2333                if (!uctx)
2334                        return -ENOMEM;
2335
2336                err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2337                kfree(uctx);
2338                if (err)
2339                        return err;
2340        }
2341
2342        xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2343                                   pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2344                                   1, &err);
2345        security_xfrm_policy_free(pol_ctx);
2346        if (xp == NULL)
2347                return -ENOENT;
2348
2349        xfrm_audit_policy_delete(xp, err ? 0 : 1,
2350                                 audit_get_loginuid(current),
2351                                 audit_get_sessionid(current), 0);
2352
2353        if (err)
2354                goto out;
2355
2356        c.seq = hdr->sadb_msg_seq;
2357        c.portid = hdr->sadb_msg_pid;
2358        c.data.byid = 0;
2359        c.event = XFRM_MSG_DELPOLICY;
2360        km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2361
2362out:
2363        xfrm_pol_put(xp);
2364        return err;
2365}
2366
2367static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2368{
2369        int err;
2370        struct sk_buff *out_skb;
2371        struct sadb_msg *out_hdr;
2372        err = 0;
2373
2374        out_skb = pfkey_xfrm_policy2msg_prep(xp);
2375        if (IS_ERR(out_skb)) {
2376                err =  PTR_ERR(out_skb);
2377                goto out;
2378        }
2379        err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2380        if (err < 0)
2381                goto out;
2382
2383        out_hdr = (struct sadb_msg *) out_skb->data;
2384        out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2385        out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2386        out_hdr->sadb_msg_satype = 0;
2387        out_hdr->sadb_msg_errno = 0;
2388        out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2389        out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2390        pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2391        err = 0;
2392
2393out:
2394        return err;
2395}
2396
2397#ifdef CONFIG_NET_KEY_MIGRATE
2398static int pfkey_sockaddr_pair_size(sa_family_t family)
2399{
2400        return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2401}
2402
2403static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2404                               xfrm_address_t *saddr, xfrm_address_t *daddr,
2405                               u16 *family)
2406{
2407        int af, socklen;
2408
2409        if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2410                return -EINVAL;
2411
2412        af = pfkey_sockaddr_extract(sa, saddr);
2413        if (!af)
2414                return -EINVAL;
2415
2416        socklen = pfkey_sockaddr_len(af);
2417        if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2418                                   daddr) != af)
2419                return -EINVAL;
2420
2421        *family = af;
2422        return 0;
2423}
2424
2425static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2426                                    struct xfrm_migrate *m)
2427{
2428        int err;
2429        struct sadb_x_ipsecrequest *rq2;
2430        int mode;
2431
2432        if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2433            len < rq1->sadb_x_ipsecrequest_len)
2434                return -EINVAL;
2435
2436        /* old endoints */
2437        err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2438                                  rq1->sadb_x_ipsecrequest_len,
2439                                  &m->old_saddr, &m->old_daddr,
2440                                  &m->old_family);
2441        if (err)
2442                return err;
2443
2444        rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2445        len -= rq1->sadb_x_ipsecrequest_len;
2446
2447        if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2448            len < rq2->sadb_x_ipsecrequest_len)
2449                return -EINVAL;
2450
2451        /* new endpoints */
2452        err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2453                                  rq2->sadb_x_ipsecrequest_len,
2454                                  &m->new_saddr, &m->new_daddr,
2455                                  &m->new_family);
2456        if (err)
2457                return err;
2458
2459        if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2460            rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2461            rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2462                return -EINVAL;
2463
2464        m->proto = rq1->sadb_x_ipsecrequest_proto;
2465        if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2466                return -EINVAL;
2467        m->mode = mode;
2468        m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2469
2470        return ((int)(rq1->sadb_x_ipsecrequest_len +
2471                      rq2->sadb_x_ipsecrequest_len));
2472}
2473
2474static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2475                         const struct sadb_msg *hdr, void * const *ext_hdrs)
2476{
2477        int i, len, ret, err = -EINVAL;
2478        u8 dir;
2479        struct sadb_address *sa;
2480        struct sadb_x_kmaddress *kma;
2481        struct sadb_x_policy *pol;
2482        struct sadb_x_ipsecrequest *rq;
2483        struct xfrm_selector sel;
2484        struct xfrm_migrate m[XFRM_MAX_DEPTH];
2485        struct xfrm_kmaddress k;
2486
2487        if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2488                                     ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2489            !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2490                err = -EINVAL;
2491                goto out;
2492        }
2493
2494        kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2495        pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2496
2497        if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2498                err = -EINVAL;
2499                goto out;
2500        }
2501
2502        if (kma) {
2503                /* convert sadb_x_kmaddress to xfrm_kmaddress */
2504                k.reserved = kma->sadb_x_kmaddress_reserved;
2505                ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2506                                          8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2507                                          &k.local, &k.remote, &k.family);
2508                if (ret < 0) {
2509                        err = ret;
2510                        goto out;
2511                }
2512        }
2513
2514        dir = pol->sadb_x_policy_dir - 1;
2515        memset(&sel, 0, sizeof(sel));
2516
2517        /* set source address info of selector */
2518        sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2519        sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2520        sel.prefixlen_s = sa->sadb_address_prefixlen;
2521        sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2522        sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2523        if (sel.sport)
2524                sel.sport_mask = htons(0xffff);
2525
2526        /* set destination address info of selector */
2527        sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2528        pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2529        sel.prefixlen_d = sa->sadb_address_prefixlen;
2530        sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2531        sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2532        if (sel.dport)
2533                sel.dport_mask = htons(0xffff);
2534
2535        rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2536
2537        /* extract ipsecrequests */
2538        i = 0;
2539        len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2540
2541        while (len > 0 && i < XFRM_MAX_DEPTH) {
2542                ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2543                if (ret < 0) {
2544                        err = ret;
2545                        goto out;
2546                } else {
2547                        rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2548                        len -= ret;
2549                        i++;
2550                }
2551        }
2552
2553        if (!i || len > 0) {
2554                err = -EINVAL;
2555                goto out;
2556        }
2557
2558        return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2559                            kma ? &k : NULL);
2560
2561 out:
2562        return err;
2563}
2564#else
2565static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2566                         const struct sadb_msg *hdr, void * const *ext_hdrs)
2567{
2568        return -ENOPROTOOPT;
2569}
2570#endif
2571
2572
2573static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2574{
2575        struct net *net = sock_net(sk);
2576        unsigned int dir;
2577        int err = 0, delete;
2578        struct sadb_x_policy *pol;
2579        struct xfrm_policy *xp;
2580        struct km_event c;
2581
2582        if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2583                return -EINVAL;
2584
2585        dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2586        if (dir >= XFRM_POLICY_MAX)
2587                return -EINVAL;
2588
2589        delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2590        xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2591                              dir, pol->sadb_x_policy_id, delete, &err);
2592        if (xp == NULL)
2593                return -ENOENT;
2594
2595        if (delete) {
2596                xfrm_audit_policy_delete(xp, err ? 0 : 1,
2597                                audit_get_loginuid(current),
2598                                audit_get_sessionid(current), 0);
2599
2600                if (err)
2601                        goto out;
2602                c.seq = hdr->sadb_msg_seq;
2603                c.portid = hdr->sadb_msg_pid;
2604                c.data.byid = 1;
2605                c.event = XFRM_MSG_DELPOLICY;
2606                km_policy_notify(xp, dir, &c);
2607        } else {
2608                err = key_pol_get_resp(sk, xp, hdr, dir);
2609        }
2610
2611out:
2612        xfrm_pol_put(xp);
2613        return err;
2614}
2615
2616static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2617{
2618        struct pfkey_sock *pfk = ptr;
2619        struct sk_buff *out_skb;
2620        struct sadb_msg *out_hdr;
2621        int err;
2622
2623        if (!pfkey_can_dump(&pfk->sk))
2624                return -ENOBUFS;
2625
2626        out_skb = pfkey_xfrm_policy2msg_prep(xp);
2627        if (IS_ERR(out_skb))
2628                return PTR_ERR(out_skb);
2629
2630        err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2631        if (err < 0)
2632                return err;
2633
2634        out_hdr = (struct sadb_msg *) out_skb->data;
2635        out_hdr->sadb_msg_version = pfk->dump.msg_version;
2636        out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2637        out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2638        out_hdr->sadb_msg_errno = 0;
2639        out_hdr->sadb_msg_seq = count + 1;
2640        out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2641
2642        if (pfk->dump.skb)
2643                pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2644                                &pfk->sk, sock_net(&pfk->sk));
2645        pfk->dump.skb = out_skb;
2646
2647        return 0;
2648}
2649
2650static int pfkey_dump_sp(struct pfkey_sock *pfk)
2651{
2652        struct net *net = sock_net(&pfk->sk);
2653        return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2654}
2655
2656static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2657{
2658        xfrm_policy_walk_done(&pfk->dump.u.policy);
2659}
2660
2661static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2662{
2663        struct pfkey_sock *pfk = pfkey_sk(sk);
2664
2665        if (pfk->dump.dump != NULL)
2666                return -EBUSY;
2667
2668        pfk->dump.msg_version = hdr->sadb_msg_version;
2669        pfk->dump.msg_portid = hdr->sadb_msg_pid;
2670        pfk->dump.dump = pfkey_dump_sp;
2671        pfk->dump.done = pfkey_dump_sp_done;
2672        xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2673
2674        return pfkey_do_dump(pfk);
2675}
2676
2677static int key_notify_policy_flush(const struct km_event *c)
2678{
2679        struct sk_buff *skb_out;
2680        struct sadb_msg *hdr;
2681
2682        skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2683        if (!skb_out)
2684                return -ENOBUFS;
2685        hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2686        hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2687        hdr->sadb_msg_seq = c->seq;
2688        hdr->sadb_msg_pid = c->portid;
2689        hdr->sadb_msg_version = PF_KEY_V2;
2690        hdr->sadb_msg_errno = (uint8_t) 0;
2691        hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2692        pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2693        return 0;
2694
2695}
2696
2697static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2698{
2699        struct net *net = sock_net(sk);
2700        struct km_event c;
2701        struct xfrm_audit audit_info;
2702        int err, err2;
2703
2704        audit_info.loginuid = audit_get_loginuid(current);
2705        audit_info.sessionid = audit_get_sessionid(current);
2706        audit_info.secid = 0;
2707        err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2708        err2 = unicast_flush_resp(sk, hdr);
2709        if (err || err2) {
2710                if (err == -ESRCH) /* empty table - old silent behavior */
2711                        return 0;
2712                return err;
2713        }
2714
2715        c.data.type = XFRM_POLICY_TYPE_MAIN;
2716        c.event = XFRM_MSG_FLUSHPOLICY;
2717        c.portid = hdr->sadb_msg_pid;
2718        c.seq = hdr->sadb_msg_seq;
2719        c.net = net;
2720        km_policy_notify(NULL, 0, &c);
2721
2722        return 0;
2723}
2724
2725typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2726                             const struct sadb_msg *hdr, void * const *ext_hdrs);
2727static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2728        [SADB_RESERVED]         = pfkey_reserved,
2729        [SADB_GETSPI]           = pfkey_getspi,
2730        [SADB_UPDATE]           = pfkey_add,
2731        [SADB_ADD]              = pfkey_add,
2732        [SADB_DELETE]           = pfkey_delete,
2733        [SADB_GET]              = pfkey_get,
2734        [SADB_ACQUIRE]          = pfkey_acquire,
2735        [SADB_REGISTER]         = pfkey_register,
2736        [SADB_EXPIRE]           = NULL,
2737        [SADB_FLUSH]            = pfkey_flush,
2738        [SADB_DUMP]             = pfkey_dump,
2739        [SADB_X_PROMISC]        = pfkey_promisc,
2740        [SADB_X_PCHANGE]        = NULL,
2741        [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2742        [SADB_X_SPDADD]         = pfkey_spdadd,
2743        [SADB_X_SPDDELETE]      = pfkey_spddelete,
2744        [SADB_X_SPDGET]         = pfkey_spdget,
2745        [SADB_X_SPDACQUIRE]     = NULL,
2746        [SADB_X_SPDDUMP]        = pfkey_spddump,
2747        [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2748        [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2749        [SADB_X_SPDDELETE2]     = pfkey_spdget,
2750        [SADB_X_MIGRATE]        = pfkey_migrate,
2751};
2752
2753static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2754{
2755        void *ext_hdrs[SADB_EXT_MAX];
2756        int err;
2757
2758        pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2759                        BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2760
2761        memset(ext_hdrs, 0, sizeof(ext_hdrs));
2762        err = parse_exthdrs(skb, hdr, ext_hdrs);
2763        if (!err) {
2764                err = -EOPNOTSUPP;
2765                if (pfkey_funcs[hdr->sadb_msg_type])
2766                        err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2767        }
2768        return err;
2769}
2770
2771static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2772{
2773        struct sadb_msg *hdr = NULL;
2774
2775        if (skb->len < sizeof(*hdr)) {
2776                *errp = -EMSGSIZE;
2777        } else {
2778                hdr = (struct sadb_msg *) skb->data;
2779                if (hdr->sadb_msg_version != PF_KEY_V2 ||
2780                    hdr->sadb_msg_reserved != 0 ||
2781                    (hdr->sadb_msg_type <= SADB_RESERVED ||
2782                     hdr->sadb_msg_type > SADB_MAX)) {
2783                        hdr = NULL;
2784                        *errp = -EINVAL;
2785                } else if (hdr->sadb_msg_len != (skb->len /
2786                                                 sizeof(uint64_t)) ||
2787                           hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2788                                                sizeof(uint64_t))) {
2789                        hdr = NULL;
2790                        *errp = -EMSGSIZE;
2791                } else {
2792                        *errp = 0;
2793                }
2794        }
2795        return hdr;
2796}
2797
2798static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2799                                const struct xfrm_algo_desc *d)
2800{
2801        unsigned int id = d->desc.sadb_alg_id;
2802
2803        if (id >= sizeof(t->aalgos) * 8)
2804                return 0;
2805
2806        return (t->aalgos >> id) & 1;
2807}
2808
2809static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2810                                const struct xfrm_algo_desc *d)
2811{
2812        unsigned int id = d->desc.sadb_alg_id;
2813
2814        if (id >= sizeof(t->ealgos) * 8)
2815                return 0;
2816
2817        return (t->ealgos >> id) & 1;
2818}
2819
2820static int count_ah_combs(const struct xfrm_tmpl *t)
2821{
2822        int i, sz = 0;
2823
2824        for (i = 0; ; i++) {
2825                const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2826                if (!aalg)
2827                        break;
2828                if (aalg_tmpl_set(t, aalg) && aalg->available)
2829                        sz += sizeof(struct sadb_comb);
2830        }
2831        return sz + sizeof(struct sadb_prop);
2832}
2833
2834static int count_esp_combs(const struct xfrm_tmpl *t)
2835{
2836        int i, k, sz = 0;
2837
2838        for (i = 0; ; i++) {
2839                const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2840                if (!ealg)
2841                        break;
2842
2843                if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2844                        continue;
2845
2846                for (k = 1; ; k++) {
2847                        const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2848                        if (!aalg)
2849                                break;
2850
2851                        if (aalg_tmpl_set(t, aalg) && aalg->available)
2852                                sz += sizeof(struct sadb_comb);
2853                }
2854        }
2855        return sz + sizeof(struct sadb_prop);
2856}
2857
2858static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2859{
2860        struct sadb_prop *p;
2861        int i;
2862
2863        p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2864        p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2865        p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2866        p->sadb_prop_replay = 32;
2867        memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2868
2869        for (i = 0; ; i++) {
2870                const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2871                if (!aalg)
2872                        break;
2873
2874                if (aalg_tmpl_set(t, aalg) && aalg->available) {
2875                        struct sadb_comb *c;
2876                        c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2877                        memset(c, 0, sizeof(*c));
2878                        p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2879                        c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2880                        c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2881                        c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2882                        c->sadb_comb_hard_addtime = 24*60*60;
2883                        c->sadb_comb_soft_addtime = 20*60*60;
2884                        c->sadb_comb_hard_usetime = 8*60*60;
2885                        c->sadb_comb_soft_usetime = 7*60*60;
2886                }
2887        }
2888}
2889
2890static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2891{
2892        struct sadb_prop *p;
2893        int i, k;
2894
2895        p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2896        p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2897        p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2898        p->sadb_prop_replay = 32;
2899        memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2900
2901        for (i=0; ; i++) {
2902                const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2903                if (!ealg)
2904                        break;
2905
2906                if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2907                        continue;
2908
2909                for (k = 1; ; k++) {
2910                        struct sadb_comb *c;
2911                        const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2912                        if (!aalg)
2913                                break;
2914                        if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2915                                continue;
2916                        c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2917                        memset(c, 0, sizeof(*c));
2918                        p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2919                        c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2920                        c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2921                        c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2922                        c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2923                        c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2924                        c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2925                        c->sadb_comb_hard_addtime = 24*60*60;
2926                        c->sadb_comb_soft_addtime = 20*60*60;
2927                        c->sadb_comb_hard_usetime = 8*60*60;
2928                        c->sadb_comb_soft_usetime = 7*60*60;
2929                }
2930        }
2931}
2932
2933static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2934{
2935        return 0;
2936}
2937
2938static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2939{
2940        struct sk_buff *out_skb;
2941        struct sadb_msg *out_hdr;
2942        int hard;
2943        int hsc;
2944
2945        hard = c->data.hard;
2946        if (hard)
2947                hsc = 2;
2948        else
2949                hsc = 1;
2950
2951        out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2952        if (IS_ERR(out_skb))
2953                return PTR_ERR(out_skb);
2954
2955        out_hdr = (struct sadb_msg *) out_skb->data;
2956        out_hdr->sadb_msg_version = PF_KEY_V2;
2957        out_hdr->sadb_msg_type = SADB_EXPIRE;
2958        out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2959        out_hdr->sadb_msg_errno = 0;
2960        out_hdr->sadb_msg_reserved = 0;
2961        out_hdr->sadb_msg_seq = 0;
2962        out_hdr->sadb_msg_pid = 0;
2963
2964        pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2965        return 0;
2966}
2967
2968static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2969{
2970        struct net *net = x ? xs_net(x) : c->net;
2971        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2972
2973        if (atomic_read(&net_pfkey->socks_nr) == 0)
2974                return 0;
2975
2976        switch (c->event) {
2977        case XFRM_MSG_EXPIRE:
2978                return key_notify_sa_expire(x, c);
2979        case XFRM_MSG_DELSA:
2980        case XFRM_MSG_NEWSA:
2981        case XFRM_MSG_UPDSA:
2982                return key_notify_sa(x, c);
2983        case XFRM_MSG_FLUSHSA:
2984                return key_notify_sa_flush(c);
2985        case XFRM_MSG_NEWAE: /* not yet supported */
2986                break;
2987        default:
2988                pr_err("pfkey: Unknown SA event %d\n", c->event);
2989                break;
2990        }
2991
2992        return 0;
2993}
2994
2995static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2996{
2997        if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
2998                return 0;
2999
3000        switch (c->event) {
3001        case XFRM_MSG_POLEXPIRE:
3002                return key_notify_policy_expire(xp, c);
3003        case XFRM_MSG_DELPOLICY:
3004        case XFRM_MSG_NEWPOLICY:
3005        case XFRM_MSG_UPDPOLICY:
3006                return key_notify_policy(xp, dir, c);
3007        case XFRM_MSG_FLUSHPOLICY:
3008                if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3009                        break;
3010                return key_notify_policy_flush(c);
3011        default:
3012                pr_err("pfkey: Unknown policy event %d\n", c->event);
3013                break;
3014        }
3015
3016        return 0;
3017}
3018
3019static u32 get_acqseq(void)
3020{
3021        u32 res;
3022        static atomic_t acqseq;
3023
3024        do {
3025                res = atomic_inc_return(&acqseq);
3026        } while (!res);
3027        return res;
3028}
3029
3030static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3031{
3032        struct sk_buff *skb;
3033        struct sadb_msg *hdr;
3034        struct sadb_address *addr;
3035        struct sadb_x_policy *pol;
3036        int sockaddr_size;
3037        int size;
3038        struct sadb_x_sec_ctx *sec_ctx;
3039        struct xfrm_sec_ctx *xfrm_ctx;
3040        int ctx_size = 0;
3041
3042        sockaddr_size = pfkey_sockaddr_size(x->props.family);
3043        if (!sockaddr_size)
3044                return -EINVAL;
3045
3046        size = sizeof(struct sadb_msg) +
3047                (sizeof(struct sadb_address) * 2) +
3048                (sockaddr_size * 2) +
3049                sizeof(struct sadb_x_policy);
3050
3051        if (x->id.proto == IPPROTO_AH)
3052                size += count_ah_combs(t);
3053        else if (x->id.proto == IPPROTO_ESP)
3054                size += count_esp_combs(t);
3055
3056        if ((xfrm_ctx = x->security)) {
3057                ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3058                size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3059        }
3060
3061        skb =  alloc_skb(size + 16, GFP_ATOMIC);
3062        if (skb == NULL)
3063                return -ENOMEM;
3064
3065        hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3066        hdr->sadb_msg_version = PF_KEY_V2;
3067        hdr->sadb_msg_type = SADB_ACQUIRE;
3068        hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3069        hdr->sadb_msg_len = size / sizeof(uint64_t);
3070        hdr->sadb_msg_errno = 0;
3071        hdr->sadb_msg_reserved = 0;
3072        hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3073        hdr->sadb_msg_pid = 0;
3074
3075        /* src address */
3076        addr = (struct sadb_address*) skb_put(skb,
3077                                              sizeof(struct sadb_address)+sockaddr_size);
3078        addr->sadb_address_len =
3079                (sizeof(struct sadb_address)+sockaddr_size)/
3080                        sizeof(uint64_t);
3081        addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3082        addr->sadb_address_proto = 0;
3083        addr->sadb_address_reserved = 0;
3084        addr->sadb_address_prefixlen =
3085                pfkey_sockaddr_fill(&x->props.saddr, 0,
3086                                    (struct sockaddr *) (addr + 1),
3087                                    x->props.family);
3088        if (!addr->sadb_address_prefixlen)
3089                BUG();
3090
3091        /* dst address */
3092        addr = (struct sadb_address*) skb_put(skb,
3093                                              sizeof(struct sadb_address)+sockaddr_size);
3094        addr->sadb_address_len =
3095                (sizeof(struct sadb_address)+sockaddr_size)/
3096                        sizeof(uint64_t);
3097        addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3098        addr->sadb_address_proto = 0;
3099        addr->sadb_address_reserved = 0;
3100        addr->sadb_address_prefixlen =
3101                pfkey_sockaddr_fill(&x->id.daddr, 0,
3102                                    (struct sockaddr *) (addr + 1),
3103                                    x->props.family);
3104        if (!addr->sadb_address_prefixlen)
3105                BUG();
3106
3107        pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3108        pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3109        pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3110        pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3111        pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3112        pol->sadb_x_policy_id = xp->index;
3113
3114        /* Set sadb_comb's. */
3115        if (x->id.proto == IPPROTO_AH)
3116                dump_ah_combs(skb, t);
3117        else if (x->id.proto == IPPROTO_ESP)
3118                dump_esp_combs(skb, t);
3119
3120        /* security context */
3121        if (xfrm_ctx) {
3122                sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3123                                sizeof(struct sadb_x_sec_ctx) + ctx_size);
3124                sec_ctx->sadb_x_sec_len =
3125                  (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3126                sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3127                sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3128                sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3129                sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3130                memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3131                       xfrm_ctx->ctx_len);
3132        }
3133
3134        return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3135}
3136
3137static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3138                                                u8 *data, int len, int *dir)
3139{
3140        struct net *net = sock_net(sk);
3141        struct xfrm_policy *xp;
3142        struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3143        struct sadb_x_sec_ctx *sec_ctx;
3144
3145        switch (sk->sk_family) {
3146        case AF_INET:
3147                if (opt != IP_IPSEC_POLICY) {
3148                        *dir = -EOPNOTSUPP;
3149                        return NULL;
3150                }
3151                break;
3152#if IS_ENABLED(CONFIG_IPV6)
3153        case AF_INET6:
3154                if (opt != IPV6_IPSEC_POLICY) {
3155                        *dir = -EOPNOTSUPP;
3156                        return NULL;
3157                }
3158                break;
3159#endif
3160        default:
3161                *dir = -EINVAL;
3162                return NULL;
3163        }
3164
3165        *dir = -EINVAL;
3166
3167        if (len < sizeof(struct sadb_x_policy) ||
3168            pol->sadb_x_policy_len*8 > len ||
3169            pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3170            (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3171                return NULL;
3172
3173        xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3174        if (xp == NULL) {
3175                *dir = -ENOBUFS;
3176                return NULL;
3177        }
3178
3179        xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3180                      XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3181
3182        xp->lft.soft_byte_limit = XFRM_INF;
3183        xp->lft.hard_byte_limit = XFRM_INF;
3184        xp->lft.soft_packet_limit = XFRM_INF;
3185        xp->lft.hard_packet_limit = XFRM_INF;
3186        xp->family = sk->sk_family;
3187
3188        xp->xfrm_nr = 0;
3189        if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3190            (*dir = parse_ipsecrequests(xp, pol)) < 0)
3191                goto out;
3192
3193        /* security context too */
3194        if (len >= (pol->sadb_x_policy_len*8 +
3195            sizeof(struct sadb_x_sec_ctx))) {
3196                char *p = (char *)pol;
3197                struct xfrm_user_sec_ctx *uctx;
3198
3199                p += pol->sadb_x_policy_len*8;
3200                sec_ctx = (struct sadb_x_sec_ctx *)p;
3201                if (len < pol->sadb_x_policy_len*8 +
3202                    sec_ctx->sadb_x_sec_len) {
3203                        *dir = -EINVAL;
3204                        goto out;
3205                }
3206                if ((*dir = verify_sec_ctx_len(p)))
3207                        goto out;
3208                uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3209                *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3210                kfree(uctx);
3211
3212                if (*dir)
3213                        goto out;
3214        }
3215
3216        *dir = pol->sadb_x_policy_dir-1;
3217        return xp;
3218
3219out:
3220        xp->walk.dead = 1;
3221        xfrm_policy_destroy(xp);
3222        return NULL;
3223}
3224
3225static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3226{
3227        struct sk_buff *skb;
3228        struct sadb_msg *hdr;
3229        struct sadb_sa *sa;
3230        struct sadb_address *addr;
3231        struct sadb_x_nat_t_port *n_port;
3232        int sockaddr_size;
3233        int size;
3234        __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3235        struct xfrm_encap_tmpl *natt = NULL;
3236
3237        sockaddr_size = pfkey_sockaddr_size(x->props.family);
3238        if (!sockaddr_size)
3239                return -EINVAL;
3240
3241        if (!satype)
3242                return -EINVAL;
3243
3244        if (!x->encap)
3245                return -EINVAL;
3246
3247        natt = x->encap;
3248
3249        /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3250         *
3251         * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3252         * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3253         */
3254
3255        size = sizeof(struct sadb_msg) +
3256                sizeof(struct sadb_sa) +
3257                (sizeof(struct sadb_address) * 2) +
3258                (sockaddr_size * 2) +
3259                (sizeof(struct sadb_x_nat_t_port) * 2);
3260
3261        skb =  alloc_skb(size + 16, GFP_ATOMIC);
3262        if (skb == NULL)
3263                return -ENOMEM;
3264
3265        hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3266        hdr->sadb_msg_version = PF_KEY_V2;
3267        hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3268        hdr->sadb_msg_satype = satype;
3269        hdr->sadb_msg_len = size / sizeof(uint64_t);
3270        hdr->sadb_msg_errno = 0;
3271        hdr->sadb_msg_reserved = 0;
3272        hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3273        hdr->sadb_msg_pid = 0;
3274
3275        /* SA */
3276        sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3277        sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3278        sa->sadb_sa_exttype = SADB_EXT_SA;
3279        sa->sadb_sa_spi = x->id.spi;
3280        sa->sadb_sa_replay = 0;
3281        sa->sadb_sa_state = 0;
3282        sa->sadb_sa_auth = 0;
3283        sa->sadb_sa_encrypt = 0;
3284        sa->sadb_sa_flags = 0;
3285
3286        /* ADDRESS_SRC (old addr) */
3287        addr = (struct sadb_address*)
3288                skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3289        addr->sadb_address_len =
3290                (sizeof(struct sadb_address)+sockaddr_size)/
3291                        sizeof(uint64_t);
3292        addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3293        addr->sadb_address_proto = 0;
3294        addr->sadb_address_reserved = 0;
3295        addr->sadb_address_prefixlen =
3296                pfkey_sockaddr_fill(&x->props.saddr, 0,
3297                                    (struct sockaddr *) (addr + 1),
3298                                    x->props.family);
3299        if (!addr->sadb_address_prefixlen)
3300                BUG();
3301
3302        /* NAT_T_SPORT (old port) */
3303        n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3304        n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3305        n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3306        n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3307        n_port->sadb_x_nat_t_port_reserved = 0;
3308
3309        /* ADDRESS_DST (new addr) */
3310        addr = (struct sadb_address*)
3311                skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3312        addr->sadb_address_len =
3313                (sizeof(struct sadb_address)+sockaddr_size)/
3314                        sizeof(uint64_t);
3315        addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3316        addr->sadb_address_proto = 0;
3317        addr->sadb_address_reserved = 0;
3318        addr->sadb_address_prefixlen =
3319                pfkey_sockaddr_fill(ipaddr, 0,
3320                                    (struct sockaddr *) (addr + 1),
3321                                    x->props.family);
3322        if (!addr->sadb_address_prefixlen)
3323                BUG();
3324
3325        /* NAT_T_DPORT (new port) */
3326        n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3327        n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3328        n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3329        n_port->sadb_x_nat_t_port_port = sport;
3330        n_port->sadb_x_nat_t_port_reserved = 0;
3331
3332        return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3333}
3334
3335#ifdef CONFIG_NET_KEY_MIGRATE
3336static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3337                            const struct xfrm_selector *sel)
3338{
3339        struct sadb_address *addr;
3340        addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3341        addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3342        addr->sadb_address_exttype = type;
3343        addr->sadb_address_proto = sel->proto;
3344        addr->sadb_address_reserved = 0;
3345
3346        switch (type) {
3347        case SADB_EXT_ADDRESS_SRC:
3348                addr->sadb_address_prefixlen = sel->prefixlen_s;
3349                pfkey_sockaddr_fill(&sel->saddr, 0,
3350                                    (struct sockaddr *)(addr + 1),
3351                                    sel->family);
3352                break;
3353        case SADB_EXT_ADDRESS_DST:
3354                addr->sadb_address_prefixlen = sel->prefixlen_d;
3355                pfkey_sockaddr_fill(&sel->daddr, 0,
3356                                    (struct sockaddr *)(addr + 1),
3357                                    sel->family);
3358                break;
3359        default:
3360                return -EINVAL;
3361        }
3362
3363        return 0;
3364}
3365
3366
3367static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3368{
3369        struct sadb_x_kmaddress *kma;
3370        u8 *sa;
3371        int family = k->family;
3372        int socklen = pfkey_sockaddr_len(family);
3373        int size_req;
3374
3375        size_req = (sizeof(struct sadb_x_kmaddress) +
3376                    pfkey_sockaddr_pair_size(family));
3377
3378        kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3379        memset(kma, 0, size_req);
3380        kma->sadb_x_kmaddress_len = size_req / 8;
3381        kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3382        kma->sadb_x_kmaddress_reserved = k->reserved;
3383
3384        sa = (u8 *)(kma + 1);
3385        if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3386            !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3387                return -EINVAL;
3388
3389        return 0;
3390}
3391
3392static int set_ipsecrequest(struct sk_buff *skb,
3393                            uint8_t proto, uint8_t mode, int level,
3394                            uint32_t reqid, uint8_t family,
3395                            const xfrm_address_t *src, const xfrm_address_t *dst)
3396{
3397        struct sadb_x_ipsecrequest *rq;
3398        u8 *sa;
3399        int socklen = pfkey_sockaddr_len(family);
3400        int size_req;
3401
3402        size_req = sizeof(struct sadb_x_ipsecrequest) +
3403                   pfkey_sockaddr_pair_size(family);
3404
3405        rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3406        memset(rq, 0, size_req);
3407        rq->sadb_x_ipsecrequest_len = size_req;
3408        rq->sadb_x_ipsecrequest_proto = proto;
3409        rq->sadb_x_ipsecrequest_mode = mode;
3410        rq->sadb_x_ipsecrequest_level = level;
3411        rq->sadb_x_ipsecrequest_reqid = reqid;
3412
3413        sa = (u8 *) (rq + 1);
3414        if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3415            !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3416                return -EINVAL;
3417
3418        return 0;
3419}
3420#endif
3421
3422#ifdef CONFIG_NET_KEY_MIGRATE
3423static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3424                              const struct xfrm_migrate *m, int num_bundles,
3425                              const struct xfrm_kmaddress *k)
3426{
3427        int i;
3428        int sasize_sel;
3429        int size = 0;
3430        int size_pol = 0;
3431        struct sk_buff *skb;
3432        struct sadb_msg *hdr;
3433        struct sadb_x_policy *pol;
3434        const struct xfrm_migrate *mp;
3435
3436        if (type != XFRM_POLICY_TYPE_MAIN)
3437                return 0;
3438
3439        if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3440                return -EINVAL;
3441
3442        if (k != NULL) {
3443                /* addresses for KM */
3444                size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3445                                     pfkey_sockaddr_pair_size(k->family));
3446        }
3447
3448        /* selector */
3449        sasize_sel = pfkey_sockaddr_size(sel->family);
3450        if (!sasize_sel)
3451                return -EINVAL;
3452        size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3453
3454        /* policy info */
3455        size_pol += sizeof(struct sadb_x_policy);
3456
3457        /* ipsecrequests */
3458        for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3459                /* old locator pair */
3460                size_pol += sizeof(struct sadb_x_ipsecrequest) +
3461                            pfkey_sockaddr_pair_size(mp->old_family);
3462                /* new locator pair */
3463                size_pol += sizeof(struct sadb_x_ipsecrequest) +
3464                            pfkey_sockaddr_pair_size(mp->new_family);
3465        }
3466
3467        size += sizeof(struct sadb_msg) + size_pol;
3468
3469        /* alloc buffer */
3470        skb = alloc_skb(size, GFP_ATOMIC);
3471        if (skb == NULL)
3472                return -ENOMEM;
3473
3474        hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3475        hdr->sadb_msg_version = PF_KEY_V2;
3476        hdr->sadb_msg_type = SADB_X_MIGRATE;
3477        hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3478        hdr->sadb_msg_len = size / 8;
3479        hdr->sadb_msg_errno = 0;
3480        hdr->sadb_msg_reserved = 0;
3481        hdr->sadb_msg_seq = 0;
3482        hdr->sadb_msg_pid = 0;
3483
3484        /* Addresses to be used by KM for negotiation, if ext is available */
3485        if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3486                goto err;
3487
3488        /* selector src */
3489        set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3490
3491        /* selector dst */
3492        set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3493
3494        /* policy information */
3495        pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3496        pol->sadb_x_policy_len = size_pol / 8;
3497        pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3498        pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3499        pol->sadb_x_policy_dir = dir + 1;
3500        pol->sadb_x_policy_id = 0;
3501        pol->sadb_x_policy_priority = 0;
3502
3503        for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3504                /* old ipsecrequest */
3505                int mode = pfkey_mode_from_xfrm(mp->mode);
3506                if (mode < 0)
3507                        goto err;
3508                if (set_ipsecrequest(skb, mp->proto, mode,
3509                                     (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3510                                     mp->reqid, mp->old_family,
3511                                     &mp->old_saddr, &mp->old_daddr) < 0)
3512                        goto err;
3513
3514                /* new ipsecrequest */
3515                if (set_ipsecrequest(skb, mp->proto, mode,
3516                                     (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3517                                     mp->reqid, mp->new_family,
3518                                     &mp->new_saddr, &mp->new_daddr) < 0)
3519                        goto err;
3520        }
3521
3522        /* broadcast migrate message to sockets */
3523        pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3524
3525        return 0;
3526
3527err:
3528        kfree_skb(skb);
3529        return -EINVAL;
3530}
3531#else
3532static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3533                              const struct xfrm_migrate *m, int num_bundles,
3534                              const struct xfrm_kmaddress *k)
3535{
3536        return -ENOPROTOOPT;
3537}
3538#endif
3539
3540static int pfkey_sendmsg(struct kiocb *kiocb,
3541                         struct socket *sock, struct msghdr *msg, size_t len)
3542{
3543        struct sock *sk = sock->sk;
3544        struct sk_buff *skb = NULL;
3545        struct sadb_msg *hdr = NULL;
3546        int err;
3547
3548        err = -EOPNOTSUPP;
3549        if (msg->msg_flags & MSG_OOB)
3550                goto out;
3551
3552        err = -EMSGSIZE;
3553        if ((unsigned int)len > sk->sk_sndbuf - 32)
3554                goto out;
3555
3556        err = -ENOBUFS;
3557        skb = alloc_skb(len, GFP_KERNEL);
3558        if (skb == NULL)
3559                goto out;
3560
3561        err = -EFAULT;
3562        if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3563                goto out;
3564
3565        hdr = pfkey_get_base_msg(skb, &err);
3566        if (!hdr)
3567                goto out;
3568
3569        mutex_lock(&xfrm_cfg_mutex);
3570        err = pfkey_process(sk, skb, hdr);
3571        mutex_unlock(&xfrm_cfg_mutex);
3572
3573out:
3574        if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3575                err = 0;
3576        kfree_skb(skb);
3577
3578        return err ? : len;
3579}
3580
3581static int pfkey_recvmsg(struct kiocb *kiocb,
3582                         struct socket *sock, struct msghdr *msg, size_t len,
3583                         int flags)
3584{
3585        struct sock *sk = sock->sk;
3586        struct pfkey_sock *pfk = pfkey_sk(sk);
3587        struct sk_buff *skb;
3588        int copied, err;
3589
3590        err = -EINVAL;
3591        if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3592                goto out;
3593
3594        msg->msg_namelen = 0;
3595        skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3596        if (skb == NULL)
3597                goto out;
3598
3599        copied = skb->len;
3600        if (copied > len) {
3601                msg->msg_flags |= MSG_TRUNC;
3602                copied = len;
3603        }
3604
3605        skb_reset_transport_header(skb);
3606        err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3607        if (err)
3608                goto out_free;
3609
3610        sock_recv_ts_and_drops(msg, sk, skb);
3611
3612        err = (flags & MSG_TRUNC) ? skb->len : copied;
3613
3614        if (pfk->dump.dump != NULL &&
3615            3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3616                pfkey_do_dump(pfk);
3617
3618out_free:
3619        skb_free_datagram(sk, skb);
3620out:
3621        return err;
3622}
3623
3624static const struct proto_ops pfkey_ops = {
3625        .family         =       PF_KEY,
3626        .owner          =       THIS_MODULE,
3627        /* Operations that make no sense on pfkey sockets. */
3628        .bind           =       sock_no_bind,
3629        .connect        =       sock_no_connect,
3630        .socketpair     =       sock_no_socketpair,
3631        .accept         =       sock_no_accept,
3632        .getname        =       sock_no_getname,
3633        .ioctl          =       sock_no_ioctl,
3634        .listen         =       sock_no_listen,
3635        .shutdown       =       sock_no_shutdown,
3636        .setsockopt     =       sock_no_setsockopt,
3637        .getsockopt     =       sock_no_getsockopt,
3638        .mmap           =       sock_no_mmap,
3639        .sendpage       =       sock_no_sendpage,
3640
3641        /* Now the operations that really occur. */
3642        .release        =       pfkey_release,
3643        .poll           =       datagram_poll,
3644        .sendmsg        =       pfkey_sendmsg,
3645        .recvmsg        =       pfkey_recvmsg,
3646};
3647
3648static const struct net_proto_family pfkey_family_ops = {
3649        .family =       PF_KEY,
3650        .create =       pfkey_create,
3651        .owner  =       THIS_MODULE,
3652};
3653
3654#ifdef CONFIG_PROC_FS
3655static int pfkey_seq_show(struct seq_file *f, void *v)
3656{
3657        struct sock *s = sk_entry(v);
3658
3659        if (v == SEQ_START_TOKEN)
3660                seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3661        else
3662                seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3663                               s,
3664                               atomic_read(&s->sk_refcnt),
3665                               sk_rmem_alloc_get(s),
3666                               sk_wmem_alloc_get(s),
3667                               from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3668                               sock_i_ino(s)
3669                               );
3670        return 0;
3671}
3672
3673static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3674        __acquires(rcu)
3675{
3676        struct net *net = seq_file_net(f);
3677        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3678
3679        rcu_read_lock();
3680        return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3681}
3682
3683static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3684{
3685        struct net *net = seq_file_net(f);
3686        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3687
3688        return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3689}
3690
3691static void pfkey_seq_stop(struct seq_file *f, void *v)
3692        __releases(rcu)
3693{
3694        rcu_read_unlock();
3695}
3696
3697static const struct seq_operations pfkey_seq_ops = {
3698        .start  = pfkey_seq_start,
3699        .next   = pfkey_seq_next,
3700        .stop   = pfkey_seq_stop,
3701        .show   = pfkey_seq_show,
3702};
3703
3704static int pfkey_seq_open(struct inode *inode, struct file *file)
3705{
3706        return seq_open_net(inode, file, &pfkey_seq_ops,
3707                            sizeof(struct seq_net_private));
3708}
3709
3710static const struct file_operations pfkey_proc_ops = {
3711        .open    = pfkey_seq_open,
3712        .read    = seq_read,
3713        .llseek  = seq_lseek,
3714        .release = seq_release_net,
3715};
3716
3717static int __net_init pfkey_init_proc(struct net *net)
3718{
3719        struct proc_dir_entry *e;
3720
3721        e = proc_net_fops_create(net, "pfkey", 0, &pfkey_proc_ops);
3722        if (e == NULL)
3723                return -ENOMEM;
3724
3725        return 0;
3726}
3727
3728static void __net_exit pfkey_exit_proc(struct net *net)
3729{
3730        proc_net_remove(net, "pfkey");
3731}
3732#else
3733static inline int pfkey_init_proc(struct net *net)
3734{
3735        return 0;
3736}
3737
3738static inline void pfkey_exit_proc(struct net *net)
3739{
3740}
3741#endif
3742
3743static struct xfrm_mgr pfkeyv2_mgr =
3744{
3745        .id             = "pfkeyv2",
3746        .notify         = pfkey_send_notify,
3747        .acquire        = pfkey_send_acquire,
3748        .compile_policy = pfkey_compile_policy,
3749        .new_mapping    = pfkey_send_new_mapping,
3750        .notify_policy  = pfkey_send_policy_notify,
3751        .migrate        = pfkey_send_migrate,
3752};
3753
3754static int __net_init pfkey_net_init(struct net *net)
3755{
3756        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3757        int rv;
3758
3759        INIT_HLIST_HEAD(&net_pfkey->table);
3760        atomic_set(&net_pfkey->socks_nr, 0);
3761
3762        rv = pfkey_init_proc(net);
3763
3764        return rv;
3765}
3766
3767static void __net_exit pfkey_net_exit(struct net *net)
3768{
3769        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3770
3771        pfkey_exit_proc(net);
3772        BUG_ON(!hlist_empty(&net_pfkey->table));
3773}
3774
3775static struct pernet_operations pfkey_net_ops = {
3776        .init = pfkey_net_init,
3777        .exit = pfkey_net_exit,
3778        .id   = &pfkey_net_id,
3779        .size = sizeof(struct netns_pfkey),
3780};
3781
3782static void __exit ipsec_pfkey_exit(void)
3783{
3784        xfrm_unregister_km(&pfkeyv2_mgr);
3785        sock_unregister(PF_KEY);
3786        unregister_pernet_subsys(&pfkey_net_ops);
3787        proto_unregister(&key_proto);
3788}
3789
3790static int __init ipsec_pfkey_init(void)
3791{
3792        int err = proto_register(&key_proto, 0);
3793
3794        if (err != 0)
3795                goto out;
3796
3797        err = register_pernet_subsys(&pfkey_net_ops);
3798        if (err != 0)
3799                goto out_unregister_key_proto;
3800        err = sock_register(&pfkey_family_ops);
3801        if (err != 0)
3802                goto out_unregister_pernet;
3803        err = xfrm_register_km(&pfkeyv2_mgr);
3804        if (err != 0)
3805                goto out_sock_unregister;
3806out:
3807        return err;
3808
3809out_sock_unregister:
3810        sock_unregister(PF_KEY);
3811out_unregister_pernet:
3812        unregister_pernet_subsys(&pfkey_net_ops);
3813out_unregister_key_proto:
3814        proto_unregister(&key_proto);
3815        goto out;
3816}
3817
3818module_init(ipsec_pfkey_init);
3819module_exit(ipsec_pfkey_exit);
3820MODULE_LICENSE("GPL");
3821MODULE_ALIAS_NETPROTO(PF_KEY);
3822
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.