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_pid;
  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->pid;
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.pid = 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.pid = 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->pid;
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.pid = 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_pid;
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_pid = 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        while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1927                if ((err = parse_ipsecrequest(xp, rq)) < 0)
1928                        return err;
1929                len -= rq->sadb_x_ipsecrequest_len;
1930                rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1931        }
1932        return 0;
1933}
1934
1935static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1936{
1937  struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1938
1939        if (xfrm_ctx) {
1940                int len = sizeof(struct sadb_x_sec_ctx);
1941                len += xfrm_ctx->ctx_len;
1942                return PFKEY_ALIGN8(len);
1943        }
1944        return 0;
1945}
1946
1947static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1948{
1949        const struct xfrm_tmpl *t;
1950        int sockaddr_size = pfkey_sockaddr_size(xp->family);
1951        int socklen = 0;
1952        int i;
1953
1954        for (i=0; i<xp->xfrm_nr; i++) {
1955                t = xp->xfrm_vec + i;
1956                socklen += pfkey_sockaddr_len(t->encap_family);
1957        }
1958
1959        return sizeof(struct sadb_msg) +
1960                (sizeof(struct sadb_lifetime) * 3) +
1961                (sizeof(struct sadb_address) * 2) +
1962                (sockaddr_size * 2) +
1963                sizeof(struct sadb_x_policy) +
1964                (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1965                (socklen * 2) +
1966                pfkey_xfrm_policy2sec_ctx_size(xp);
1967}
1968
1969static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1970{
1971        struct sk_buff *skb;
1972        int size;
1973
1974        size = pfkey_xfrm_policy2msg_size(xp);
1975
1976        skb =  alloc_skb(size + 16, GFP_ATOMIC);
1977        if (skb == NULL)
1978                return ERR_PTR(-ENOBUFS);
1979
1980        return skb;
1981}
1982
1983static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1984{
1985        struct sadb_msg *hdr;
1986        struct sadb_address *addr;
1987        struct sadb_lifetime *lifetime;
1988        struct sadb_x_policy *pol;
1989        struct sadb_x_sec_ctx *sec_ctx;
1990        struct xfrm_sec_ctx *xfrm_ctx;
1991        int i;
1992        int size;
1993        int sockaddr_size = pfkey_sockaddr_size(xp->family);
1994        int socklen = pfkey_sockaddr_len(xp->family);
1995
1996        size = pfkey_xfrm_policy2msg_size(xp);
1997
1998        /* call should fill header later */
1999        hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2000        memset(hdr, 0, size);   /* XXX do we need this ? */
2001
2002        /* src address */
2003        addr = (struct sadb_address*) skb_put(skb,
2004                                              sizeof(struct sadb_address)+sockaddr_size);
2005        addr->sadb_address_len =
2006                (sizeof(struct sadb_address)+sockaddr_size)/
2007                        sizeof(uint64_t);
2008        addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2009        addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2010        addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2011        addr->sadb_address_reserved = 0;
2012        if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2013                                 xp->selector.sport,
2014                                 (struct sockaddr *) (addr + 1),
2015                                 xp->family))
2016                BUG();
2017
2018        /* dst address */
2019        addr = (struct sadb_address*) skb_put(skb,
2020                                              sizeof(struct sadb_address)+sockaddr_size);
2021        addr->sadb_address_len =
2022                (sizeof(struct sadb_address)+sockaddr_size)/
2023                        sizeof(uint64_t);
2024        addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2025        addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2026        addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2027        addr->sadb_address_reserved = 0;
2028
2029        pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2030                            (struct sockaddr *) (addr + 1),
2031                            xp->family);
2032
2033        /* hard time */
2034        lifetime = (struct sadb_lifetime *)  skb_put(skb,
2035                                                     sizeof(struct sadb_lifetime));
2036        lifetime->sadb_lifetime_len =
2037                sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2038        lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2039        lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2040        lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2041        lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2042        lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2043        /* soft time */
2044        lifetime = (struct sadb_lifetime *)  skb_put(skb,
2045                                                     sizeof(struct sadb_lifetime));
2046        lifetime->sadb_lifetime_len =
2047                sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2048        lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2049        lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2050        lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2051        lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2052        lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2053        /* current time */
2054        lifetime = (struct sadb_lifetime *)  skb_put(skb,
2055                                                     sizeof(struct sadb_lifetime));
2056        lifetime->sadb_lifetime_len =
2057                sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2058        lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2059        lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2060        lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2061        lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2062        lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2063
2064        pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2065        pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2066        pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2067        pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2068        if (xp->action == XFRM_POLICY_ALLOW) {
2069                if (xp->xfrm_nr)
2070                        pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2071                else
2072                        pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2073        }
2074        pol->sadb_x_policy_dir = dir+1;
2075        pol->sadb_x_policy_id = xp->index;
2076        pol->sadb_x_policy_priority = xp->priority;
2077
2078        for (i=0; i<xp->xfrm_nr; i++) {
2079                const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2080                struct sadb_x_ipsecrequest *rq;
2081                int req_size;
2082                int mode;
2083
2084                req_size = sizeof(struct sadb_x_ipsecrequest);
2085                if (t->mode == XFRM_MODE_TUNNEL) {
2086                        socklen = pfkey_sockaddr_len(t->encap_family);
2087                        req_size += socklen * 2;
2088                } else {
2089                        size -= 2*socklen;
2090                }
2091                rq = (void*)skb_put(skb, req_size);
2092                pol->sadb_x_policy_len += req_size/8;
2093                memset(rq, 0, sizeof(*rq));
2094                rq->sadb_x_ipsecrequest_len = req_size;
2095                rq->sadb_x_ipsecrequest_proto = t->id.proto;
2096                if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2097                        return -EINVAL;
2098                rq->sadb_x_ipsecrequest_mode = mode;
2099                rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2100                if (t->reqid)
2101                        rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2102                if (t->optional)
2103                        rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2104                rq->sadb_x_ipsecrequest_reqid = t->reqid;
2105
2106                if (t->mode == XFRM_MODE_TUNNEL) {
2107                        u8 *sa = (void *)(rq + 1);
2108                        pfkey_sockaddr_fill(&t->saddr, 0,
2109                                            (struct sockaddr *)sa,
2110                                            t->encap_family);
2111                        pfkey_sockaddr_fill(&t->id.daddr, 0,
2112                                            (struct sockaddr *) (sa + socklen),
2113                                            t->encap_family);
2114                }
2115        }
2116
2117        /* security context */
2118        if ((xfrm_ctx = xp->security)) {
2119                int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2120
2121                sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2122                sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2123                sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2124                sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2125                sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2126                sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2127                memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2128                       xfrm_ctx->ctx_len);
2129        }
2130
2131        hdr->sadb_msg_len = size / sizeof(uint64_t);
2132        hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2133
2134        return 0;
2135}
2136
2137static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2138{
2139        struct sk_buff *out_skb;
2140        struct sadb_msg *out_hdr;
2141        int err;
2142
2143        out_skb = pfkey_xfrm_policy2msg_prep(xp);
2144        if (IS_ERR(out_skb))
2145                return PTR_ERR(out_skb);
2146
2147        err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2148        if (err < 0)
2149                return err;
2150
2151        out_hdr = (struct sadb_msg *) out_skb->data;
2152        out_hdr->sadb_msg_version = PF_KEY_V2;
2153
2154        if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2155                out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2156        else
2157                out_hdr->sadb_msg_type = event2poltype(c->event);
2158        out_hdr->sadb_msg_errno = 0;
2159        out_hdr->sadb_msg_seq = c->seq;
2160        out_hdr->sadb_msg_pid = c->pid;
2161        pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2162        return 0;
2163
2164}
2165
2166static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2167{
2168        struct net *net = sock_net(sk);
2169        int err = 0;
2170        struct sadb_lifetime *lifetime;
2171        struct sadb_address *sa;
2172        struct sadb_x_policy *pol;
2173        struct xfrm_policy *xp;
2174        struct km_event c;
2175        struct sadb_x_sec_ctx *sec_ctx;
2176
2177        if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2178                                     ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2179            !ext_hdrs[SADB_X_EXT_POLICY-1])
2180                return -EINVAL;
2181
2182        pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2183        if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2184                return -EINVAL;
2185        if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2186                return -EINVAL;
2187
2188        xp = xfrm_policy_alloc(net, GFP_KERNEL);
2189        if (xp == NULL)
2190                return -ENOBUFS;
2191
2192        xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2193                      XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2194        xp->priority = pol->sadb_x_policy_priority;
2195
2196        sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2197        xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2198        if (!xp->family) {
2199                err = -EINVAL;
2200                goto out;
2201        }
2202        xp->selector.family = xp->family;
2203        xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2204        xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2205        xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2206        if (xp->selector.sport)
2207                xp->selector.sport_mask = htons(0xffff);
2208
2209        sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2210        pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2211        xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2212
2213        /* Amusing, we set this twice.  KAME apps appear to set same value
2214         * in both addresses.
2215         */
2216        xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2217
2218        xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2219        if (xp->selector.dport)
2220                xp->selector.dport_mask = htons(0xffff);
2221
2222        sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2223        if (sec_ctx != NULL) {
2224                struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2225
2226                if (!uctx) {
2227                        err = -ENOBUFS;
2228                        goto out;
2229                }
2230
2231                err = security_xfrm_policy_alloc(&xp->security, uctx);
2232                kfree(uctx);
2233
2234                if (err)
2235                        goto out;
2236        }
2237
2238        xp->lft.soft_byte_limit = XFRM_INF;
2239        xp->lft.hard_byte_limit = XFRM_INF;
2240        xp->lft.soft_packet_limit = XFRM_INF;
2241        xp->lft.hard_packet_limit = XFRM_INF;
2242        if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2243                xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2244                xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2245                xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2246                xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2247        }
2248        if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2249                xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2250                xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2251                xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2252                xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2253        }
2254        xp->xfrm_nr = 0;
2255        if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2256            (err = parse_ipsecrequests(xp, pol)) < 0)
2257                goto out;
2258
2259        err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2260                                 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2261
2262        xfrm_audit_policy_add(xp, err ? 0 : 1,
2263                              audit_get_loginuid(current),
2264                              audit_get_sessionid(current), 0);
2265
2266        if (err)
2267                goto out;
2268
2269        if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2270                c.event = XFRM_MSG_UPDPOLICY;
2271        else
2272                c.event = XFRM_MSG_NEWPOLICY;
2273
2274        c.seq = hdr->sadb_msg_seq;
2275        c.pid = hdr->sadb_msg_pid;
2276
2277        km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2278        xfrm_pol_put(xp);
2279        return 0;
2280
2281out:
2282        xp->walk.dead = 1;
2283        xfrm_policy_destroy(xp);
2284        return err;
2285}
2286
2287static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2288{
2289        struct net *net = sock_net(sk);
2290        int err;
2291        struct sadb_address *sa;
2292        struct sadb_x_policy *pol;
2293        struct xfrm_policy *xp;
2294        struct xfrm_selector sel;
2295        struct km_event c;
2296        struct sadb_x_sec_ctx *sec_ctx;
2297        struct xfrm_sec_ctx *pol_ctx = NULL;
2298
2299        if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2300                                     ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2301            !ext_hdrs[SADB_X_EXT_POLICY-1])
2302                return -EINVAL;
2303
2304        pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2305        if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2306                return -EINVAL;
2307
2308        memset(&sel, 0, sizeof(sel));
2309
2310        sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2311        sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2312        sel.prefixlen_s = sa->sadb_address_prefixlen;
2313        sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2314        sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2315        if (sel.sport)
2316                sel.sport_mask = htons(0xffff);
2317
2318        sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2319        pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2320        sel.prefixlen_d = sa->sadb_address_prefixlen;
2321        sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2322        sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2323        if (sel.dport)
2324                sel.dport_mask = htons(0xffff);
2325
2326        sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2327        if (sec_ctx != NULL) {
2328                struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2329
2330                if (!uctx)
2331                        return -ENOMEM;
2332
2333                err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2334                kfree(uctx);
2335                if (err)
2336                        return err;
2337        }
2338
2339        xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2340                                   pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2341                                   1, &err);
2342        security_xfrm_policy_free(pol_ctx);
2343        if (xp == NULL)
2344                return -ENOENT;
2345
2346        xfrm_audit_policy_delete(xp, err ? 0 : 1,
2347                                 audit_get_loginuid(current),
2348                                 audit_get_sessionid(current), 0);
2349
2350        if (err)
2351                goto out;
2352
2353        c.seq = hdr->sadb_msg_seq;
2354        c.pid = hdr->sadb_msg_pid;
2355        c.data.byid = 0;
2356        c.event = XFRM_MSG_DELPOLICY;
2357        km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2358
2359out:
2360        xfrm_pol_put(xp);
2361        return err;
2362}
2363
2364static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2365{
2366        int err;
2367        struct sk_buff *out_skb;
2368        struct sadb_msg *out_hdr;
2369        err = 0;
2370
2371        out_skb = pfkey_xfrm_policy2msg_prep(xp);
2372        if (IS_ERR(out_skb)) {
2373                err =  PTR_ERR(out_skb);
2374                goto out;
2375        }
2376        err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2377        if (err < 0)
2378                goto out;
2379
2380        out_hdr = (struct sadb_msg *) out_skb->data;
2381        out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2382        out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2383        out_hdr->sadb_msg_satype = 0;
2384        out_hdr->sadb_msg_errno = 0;
2385        out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2386        out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2387        pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2388        err = 0;
2389
2390out:
2391        return err;
2392}
2393
2394#ifdef CONFIG_NET_KEY_MIGRATE
2395static int pfkey_sockaddr_pair_size(sa_family_t family)
2396{
2397        return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2398}
2399
2400static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2401                               xfrm_address_t *saddr, xfrm_address_t *daddr,
2402                               u16 *family)
2403{
2404        int af, socklen;
2405
2406        if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2407                return -EINVAL;
2408
2409        af = pfkey_sockaddr_extract(sa, saddr);
2410        if (!af)
2411                return -EINVAL;
2412
2413        socklen = pfkey_sockaddr_len(af);
2414        if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2415                                   daddr) != af)
2416                return -EINVAL;
2417
2418        *family = af;
2419        return 0;
2420}
2421
2422static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2423                                    struct xfrm_migrate *m)
2424{
2425        int err;
2426        struct sadb_x_ipsecrequest *rq2;
2427        int mode;
2428
2429        if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2430            len < rq1->sadb_x_ipsecrequest_len)
2431                return -EINVAL;
2432
2433        /* old endoints */
2434        err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2435                                  rq1->sadb_x_ipsecrequest_len,
2436                                  &m->old_saddr, &m->old_daddr,
2437                                  &m->old_family);
2438        if (err)
2439                return err;
2440
2441        rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2442        len -= rq1->sadb_x_ipsecrequest_len;
2443
2444        if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2445            len < rq2->sadb_x_ipsecrequest_len)
2446                return -EINVAL;
2447
2448        /* new endpoints */
2449        err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2450                                  rq2->sadb_x_ipsecrequest_len,
2451                                  &m->new_saddr, &m->new_daddr,
2452                                  &m->new_family);
2453        if (err)
2454                return err;
2455
2456        if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2457            rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2458            rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2459                return -EINVAL;
2460
2461        m->proto = rq1->sadb_x_ipsecrequest_proto;
2462        if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2463                return -EINVAL;
2464        m->mode = mode;
2465        m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2466
2467        return ((int)(rq1->sadb_x_ipsecrequest_len +
2468                      rq2->sadb_x_ipsecrequest_len));
2469}
2470
2471static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2472                         const struct sadb_msg *hdr, void * const *ext_hdrs)
2473{
2474        int i, len, ret, err = -EINVAL;
2475        u8 dir;
2476        struct sadb_address *sa;
2477        struct sadb_x_kmaddress *kma;
2478        struct sadb_x_policy *pol;
2479        struct sadb_x_ipsecrequest *rq;
2480        struct xfrm_selector sel;
2481        struct xfrm_migrate m[XFRM_MAX_DEPTH];
2482        struct xfrm_kmaddress k;
2483
2484        if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2485                                     ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2486            !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2487                err = -EINVAL;
2488                goto out;
2489        }
2490
2491        kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2492        pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2493
2494        if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2495                err = -EINVAL;
2496                goto out;
2497        }
2498
2499        if (kma) {
2500                /* convert sadb_x_kmaddress to xfrm_kmaddress */
2501                k.reserved = kma->sadb_x_kmaddress_reserved;
2502                ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2503                                          8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2504                                          &k.local, &k.remote, &k.family);
2505                if (ret < 0) {
2506                        err = ret;
2507                        goto out;
2508                }
2509        }
2510
2511        dir = pol->sadb_x_policy_dir - 1;
2512        memset(&sel, 0, sizeof(sel));
2513
2514        /* set source address info of selector */
2515        sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2516        sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2517        sel.prefixlen_s = sa->sadb_address_prefixlen;
2518        sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2519        sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2520        if (sel.sport)
2521                sel.sport_mask = htons(0xffff);
2522
2523        /* set destination address info of selector */
2524        sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2525        pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2526        sel.prefixlen_d = sa->sadb_address_prefixlen;
2527        sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2528        sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2529        if (sel.dport)
2530                sel.dport_mask = htons(0xffff);
2531
2532        rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2533
2534        /* extract ipsecrequests */
2535        i = 0;
2536        len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2537
2538        while (len > 0 && i < XFRM_MAX_DEPTH) {
2539                ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2540                if (ret < 0) {
2541                        err = ret;
2542                        goto out;
2543                } else {
2544                        rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2545                        len -= ret;
2546                        i++;
2547                }
2548        }
2549
2550        if (!i || len > 0) {
2551                err = -EINVAL;
2552                goto out;
2553        }
2554
2555        return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2556                            kma ? &k : NULL);
2557
2558 out:
2559        return err;
2560}
2561#else
2562static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2563                         const struct sadb_msg *hdr, void * const *ext_hdrs)
2564{
2565        return -ENOPROTOOPT;
2566}
2567#endif
2568
2569
2570static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2571{
2572        struct net *net = sock_net(sk);
2573        unsigned int dir;
2574        int err = 0, delete;
2575        struct sadb_x_policy *pol;
2576        struct xfrm_policy *xp;
2577        struct km_event c;
2578
2579        if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2580                return -EINVAL;
2581
2582        dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2583        if (dir >= XFRM_POLICY_MAX)
2584                return -EINVAL;
2585
2586        delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2587        xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2588                              dir, pol->sadb_x_policy_id, delete, &err);
2589        if (xp == NULL)
2590                return -ENOENT;
2591
2592        if (delete) {
2593                xfrm_audit_policy_delete(xp, err ? 0 : 1,
2594                                audit_get_loginuid(current),
2595                                audit_get_sessionid(current), 0);
2596
2597                if (err)
2598                        goto out;
2599                c.seq = hdr->sadb_msg_seq;
2600                c.pid = hdr->sadb_msg_pid;
2601                c.data.byid = 1;
2602                c.event = XFRM_MSG_DELPOLICY;
2603                km_policy_notify(xp, dir, &c);
2604        } else {
2605                err = key_pol_get_resp(sk, xp, hdr, dir);
2606        }
2607
2608out:
2609        xfrm_pol_put(xp);
2610        return err;
2611}
2612
2613static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2614{
2615        struct pfkey_sock *pfk = ptr;
2616        struct sk_buff *out_skb;
2617        struct sadb_msg *out_hdr;
2618        int err;
2619
2620        if (!pfkey_can_dump(&pfk->sk))
2621                return -ENOBUFS;
2622
2623        out_skb = pfkey_xfrm_policy2msg_prep(xp);
2624        if (IS_ERR(out_skb))
2625                return PTR_ERR(out_skb);
2626
2627        err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2628        if (err < 0)
2629                return err;
2630
2631        out_hdr = (struct sadb_msg *) out_skb->data;
2632        out_hdr->sadb_msg_version = pfk->dump.msg_version;
2633        out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2634        out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2635        out_hdr->sadb_msg_errno = 0;
2636        out_hdr->sadb_msg_seq = count + 1;
2637        out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
2638
2639        if (pfk->dump.skb)
2640                pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2641                                &pfk->sk, sock_net(&pfk->sk));
2642        pfk->dump.skb = out_skb;
2643
2644        return 0;
2645}
2646
2647static int pfkey_dump_sp(struct pfkey_sock *pfk)
2648{
2649        struct net *net = sock_net(&pfk->sk);
2650        return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2651}
2652
2653static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2654{
2655        xfrm_policy_walk_done(&pfk->dump.u.policy);
2656}
2657
2658static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2659{
2660        struct pfkey_sock *pfk = pfkey_sk(sk);
2661
2662        if (pfk->dump.dump != NULL)
2663                return -EBUSY;
2664
2665        pfk->dump.msg_version = hdr->sadb_msg_version;
2666        pfk->dump.msg_pid = hdr->sadb_msg_pid;
2667        pfk->dump.dump = pfkey_dump_sp;
2668        pfk->dump.done = pfkey_dump_sp_done;
2669        xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2670
2671        return pfkey_do_dump(pfk);
2672}
2673
2674static int key_notify_policy_flush(const struct km_event *c)
2675{
2676        struct sk_buff *skb_out;
2677        struct sadb_msg *hdr;
2678
2679        skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2680        if (!skb_out)
2681                return -ENOBUFS;
2682        hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2683        hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2684        hdr->sadb_msg_seq = c->seq;
2685        hdr->sadb_msg_pid = c->pid;
2686        hdr->sadb_msg_version = PF_KEY_V2;
2687        hdr->sadb_msg_errno = (uint8_t) 0;
2688        hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2689        pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2690        return 0;
2691
2692}
2693
2694static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2695{
2696        struct net *net = sock_net(sk);
2697        struct km_event c;
2698        struct xfrm_audit audit_info;
2699        int err, err2;
2700
2701        audit_info.loginuid = audit_get_loginuid(current);
2702        audit_info.sessionid = audit_get_sessionid(current);
2703        audit_info.secid = 0;
2704        err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2705        err2 = unicast_flush_resp(sk, hdr);
2706        if (err || err2) {
2707                if (err == -ESRCH) /* empty table - old silent behavior */
2708                        return 0;
2709                return err;
2710        }
2711
2712        c.data.type = XFRM_POLICY_TYPE_MAIN;
2713        c.event = XFRM_MSG_FLUSHPOLICY;
2714        c.pid = hdr->sadb_msg_pid;
2715        c.seq = hdr->sadb_msg_seq;
2716        c.net = net;
2717        km_policy_notify(NULL, 0, &c);
2718
2719        return 0;
2720}
2721
2722typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2723                             const struct sadb_msg *hdr, void * const *ext_hdrs);
2724static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2725        [SADB_RESERVED]         = pfkey_reserved,
2726        [SADB_GETSPI]           = pfkey_getspi,
2727        [SADB_UPDATE]           = pfkey_add,
2728        [SADB_ADD]              = pfkey_add,
2729        [SADB_DELETE]           = pfkey_delete,
2730        [SADB_GET]              = pfkey_get,
2731        [SADB_ACQUIRE]          = pfkey_acquire,
2732        [SADB_REGISTER]         = pfkey_register,
2733        [SADB_EXPIRE]           = NULL,
2734        [SADB_FLUSH]            = pfkey_flush,
2735        [SADB_DUMP]             = pfkey_dump,
2736        [SADB_X_PROMISC]        = pfkey_promisc,
2737        [SADB_X_PCHANGE]        = NULL,
2738        [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2739        [SADB_X_SPDADD]         = pfkey_spdadd,
2740        [SADB_X_SPDDELETE]      = pfkey_spddelete,
2741        [SADB_X_SPDGET]         = pfkey_spdget,
2742        [SADB_X_SPDACQUIRE]     = NULL,
2743        [SADB_X_SPDDUMP]        = pfkey_spddump,
2744        [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2745        [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2746        [SADB_X_SPDDELETE2]     = pfkey_spdget,
2747        [SADB_X_MIGRATE]        = pfkey_migrate,
2748};
2749
2750static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2751{
2752        void *ext_hdrs[SADB_EXT_MAX];
2753        int err;
2754
2755        pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2756                        BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2757
2758        memset(ext_hdrs, 0, sizeof(ext_hdrs));
2759        err = parse_exthdrs(skb, hdr, ext_hdrs);
2760        if (!err) {
2761                err = -EOPNOTSUPP;
2762                if (pfkey_funcs[hdr->sadb_msg_type])
2763                        err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2764        }
2765        return err;
2766}
2767
2768static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2769{
2770        struct sadb_msg *hdr = NULL;
2771
2772        if (skb->len < sizeof(*hdr)) {
2773                *errp = -EMSGSIZE;
2774        } else {
2775                hdr = (struct sadb_msg *) skb->data;
2776                if (hdr->sadb_msg_version != PF_KEY_V2 ||
2777                    hdr->sadb_msg_reserved != 0 ||
2778                    (hdr->sadb_msg_type <= SADB_RESERVED ||
2779                     hdr->sadb_msg_type > SADB_MAX)) {
2780                        hdr = NULL;
2781                        *errp = -EINVAL;
2782                } else if (hdr->sadb_msg_len != (skb->len /
2783                                                 sizeof(uint64_t)) ||
2784                           hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2785                                                sizeof(uint64_t))) {
2786                        hdr = NULL;
2787                        *errp = -EMSGSIZE;
2788                } else {
2789                        *errp = 0;
2790                }
2791        }
2792        return hdr;
2793}
2794
2795static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2796                                const struct xfrm_algo_desc *d)
2797{
2798        unsigned int id = d->desc.sadb_alg_id;
2799
2800        if (id >= sizeof(t->aalgos) * 8)
2801                return 0;
2802
2803        return (t->aalgos >> id) & 1;
2804}
2805
2806static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2807                                const struct xfrm_algo_desc *d)
2808{
2809        unsigned int id = d->desc.sadb_alg_id;
2810
2811        if (id >= sizeof(t->ealgos) * 8)
2812                return 0;
2813
2814        return (t->ealgos >> id) & 1;
2815}
2816
2817static int count_ah_combs(const struct xfrm_tmpl *t)
2818{
2819        int i, sz = 0;
2820
2821        for (i = 0; ; i++) {
2822                const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2823                if (!aalg)
2824                        break;
2825                if (aalg_tmpl_set(t, aalg) && aalg->available)
2826                        sz += sizeof(struct sadb_comb);
2827        }
2828        return sz + sizeof(struct sadb_prop);
2829}
2830
2831static int count_esp_combs(const struct xfrm_tmpl *t)
2832{
2833        int i, k, sz = 0;
2834
2835        for (i = 0; ; i++) {
2836                const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2837                if (!ealg)
2838                        break;
2839
2840                if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2841                        continue;
2842
2843                for (k = 1; ; k++) {
2844                        const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2845                        if (!aalg)
2846                                break;
2847
2848                        if (aalg_tmpl_set(t, aalg) && aalg->available)
2849                                sz += sizeof(struct sadb_comb);
2850                }
2851        }
2852        return sz + sizeof(struct sadb_prop);
2853}
2854
2855static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2856{
2857        struct sadb_prop *p;
2858        int i;
2859
2860        p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2861        p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2862        p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2863        p->sadb_prop_replay = 32;
2864        memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2865
2866        for (i = 0; ; i++) {
2867                const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2868                if (!aalg)
2869                        break;
2870
2871                if (aalg_tmpl_set(t, aalg) && aalg->available) {
2872                        struct sadb_comb *c;
2873                        c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2874                        memset(c, 0, sizeof(*c));
2875                        p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2876                        c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2877                        c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2878                        c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2879                        c->sadb_comb_hard_addtime = 24*60*60;
2880                        c->sadb_comb_soft_addtime = 20*60*60;
2881                        c->sadb_comb_hard_usetime = 8*60*60;
2882                        c->sadb_comb_soft_usetime = 7*60*60;
2883                }
2884        }
2885}
2886
2887static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2888{
2889        struct sadb_prop *p;
2890        int i, k;
2891
2892        p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2893        p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2894        p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2895        p->sadb_prop_replay = 32;
2896        memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2897
2898        for (i=0; ; i++) {
2899                const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2900                if (!ealg)
2901                        break;
2902
2903                if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2904                        continue;
2905
2906                for (k = 1; ; k++) {
2907                        struct sadb_comb *c;
2908                        const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2909                        if (!aalg)
2910                                break;
2911                        if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2912                                continue;
2913                        c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2914                        memset(c, 0, sizeof(*c));
2915                        p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2916                        c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2917                        c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2918                        c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2919                        c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2920                        c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2921                        c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2922                        c->sadb_comb_hard_addtime = 24*60*60;
2923                        c->sadb_comb_soft_addtime = 20*60*60;
2924                        c->sadb_comb_hard_usetime = 8*60*60;
2925                        c->sadb_comb_soft_usetime = 7*60*60;
2926                }
2927        }
2928}
2929
2930static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2931{
2932        return 0;
2933}
2934
2935static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2936{
2937        struct sk_buff *out_skb;
2938        struct sadb_msg *out_hdr;
2939        int hard;
2940        int hsc;
2941
2942        hard = c->data.hard;
2943        if (hard)
2944                hsc = 2;
2945        else
2946                hsc = 1;
2947
2948        out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2949        if (IS_ERR(out_skb))
2950                return PTR_ERR(out_skb);
2951
2952        out_hdr = (struct sadb_msg *) out_skb->data;
2953        out_hdr->sadb_msg_version = PF_KEY_V2;
2954        out_hdr->sadb_msg_type = SADB_EXPIRE;
2955        out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2956        out_hdr->sadb_msg_errno = 0;
2957        out_hdr->sadb_msg_reserved = 0;
2958        out_hdr->sadb_msg_seq = 0;
2959        out_hdr->sadb_msg_pid = 0;
2960
2961        pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2962        return 0;
2963}
2964
2965static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2966{
2967        struct net *net = x ? xs_net(x) : c->net;
2968        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2969
2970        if (atomic_read(&net_pfkey->socks_nr) == 0)
2971                return 0;
2972
2973        switch (c->event) {
2974        case XFRM_MSG_EXPIRE:
2975                return key_notify_sa_expire(x, c);
2976        case XFRM_MSG_DELSA:
2977        case XFRM_MSG_NEWSA:
2978        case XFRM_MSG_UPDSA:
2979                return key_notify_sa(x, c);
2980        case XFRM_MSG_FLUSHSA:
2981                return key_notify_sa_flush(c);
2982        case XFRM_MSG_NEWAE: /* not yet supported */
2983                break;
2984        default:
2985                pr_err("pfkey: Unknown SA event %d\n", c->event);
2986                break;
2987        }
2988
2989        return 0;
2990}
2991
2992static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2993{
2994        if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
2995                return 0;
2996
2997        switch (c->event) {
2998        case XFRM_MSG_POLEXPIRE:
2999                return key_notify_policy_expire(xp, c);
3000        case XFRM_MSG_DELPOLICY:
3001        case XFRM_MSG_NEWPOLICY:
3002        case XFRM_MSG_UPDPOLICY:
3003                return key_notify_policy(xp, dir, c);
3004        case XFRM_MSG_FLUSHPOLICY:
3005                if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3006                        break;
3007                return key_notify_policy_flush(c);
3008        default:
3009                pr_err("pfkey: Unknown policy event %d\n", c->event);
3010                break;
3011        }
3012
3013        return 0;
3014}
3015
3016static u32 get_acqseq(void)
3017{
3018        u32 res;
3019        static atomic_t acqseq;
3020
3021        do {
3022                res = atomic_inc_return(&acqseq);
3023        } while (!res);
3024        return res;
3025}
3026
3027static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
3028{
3029        struct sk_buff *skb;
3030        struct sadb_msg *hdr;
3031        struct sadb_address *addr;
3032        struct sadb_x_policy *pol;
3033        int sockaddr_size;
3034        int size;
3035        struct sadb_x_sec_ctx *sec_ctx;
3036        struct xfrm_sec_ctx *xfrm_ctx;
3037        int ctx_size = 0;
3038
3039        sockaddr_size = pfkey_sockaddr_size(x->props.family);
3040        if (!sockaddr_size)
3041                return -EINVAL;
3042
3043        size = sizeof(struct sadb_msg) +
3044                (sizeof(struct sadb_address) * 2) +
3045                (sockaddr_size * 2) +
3046                sizeof(struct sadb_x_policy);
3047
3048        if (x->id.proto == IPPROTO_AH)
3049                size += count_ah_combs(t);
3050        else if (x->id.proto == IPPROTO_ESP)
3051                size += count_esp_combs(t);
3052
3053        if ((xfrm_ctx = x->security)) {
3054                ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3055                size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3056        }
3057
3058        skb =  alloc_skb(size + 16, GFP_ATOMIC);
3059        if (skb == NULL)
3060                return -ENOMEM;
3061
3062        hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3063        hdr->sadb_msg_version = PF_KEY_V2;
3064        hdr->sadb_msg_type = SADB_ACQUIRE;
3065        hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3066        hdr->sadb_msg_len = size / sizeof(uint64_t);
3067        hdr->sadb_msg_errno = 0;
3068        hdr->sadb_msg_reserved = 0;
3069        hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3070        hdr->sadb_msg_pid = 0;
3071
3072        /* src address */
3073        addr = (struct sadb_address*) skb_put(skb,
3074                                              sizeof(struct sadb_address)+sockaddr_size);
3075        addr->sadb_address_len =
3076                (sizeof(struct sadb_address)+sockaddr_size)/
3077                        sizeof(uint64_t);
3078        addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3079        addr->sadb_address_proto = 0;
3080        addr->sadb_address_reserved = 0;
3081        addr->sadb_address_prefixlen =
3082                pfkey_sockaddr_fill(&x->props.saddr, 0,
3083                                    (struct sockaddr *) (addr + 1),
3084                                    x->props.family);
3085        if (!addr->sadb_address_prefixlen)
3086                BUG();
3087
3088        /* dst address */
3089        addr = (struct sadb_address*) skb_put(skb,
3090                                              sizeof(struct sadb_address)+sockaddr_size);
3091        addr->sadb_address_len =
3092                (sizeof(struct sadb_address)+sockaddr_size)/
3093                        sizeof(uint64_t);
3094        addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3095        addr->sadb_address_proto = 0;
3096        addr->sadb_address_reserved = 0;
3097        addr->sadb_address_prefixlen =
3098                pfkey_sockaddr_fill(&x->id.daddr, 0,
3099                                    (struct sockaddr *) (addr + 1),
3100                                    x->props.family);
3101        if (!addr->sadb_address_prefixlen)
3102                BUG();
3103
3104        pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3105        pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3106        pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3107        pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3108        pol->sadb_x_policy_dir = dir+1;
3109        pol->sadb_x_policy_id = xp->index;
3110
3111        /* Set sadb_comb's. */
3112        if (x->id.proto == IPPROTO_AH)
3113                dump_ah_combs(skb, t);
3114        else if (x->id.proto == IPPROTO_ESP)
3115                dump_esp_combs(skb, t);
3116
3117        /* security context */
3118        if (xfrm_ctx) {
3119                sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3120                                sizeof(struct sadb_x_sec_ctx) + ctx_size);
3121                sec_ctx->sadb_x_sec_len =
3122                  (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3123                sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3124                sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3125                sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3126                sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3127                memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3128                       xfrm_ctx->ctx_len);
3129        }
3130
3131        return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3132}
3133
3134static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3135                                                u8 *data, int len, int *dir)
3136{
3137        struct net *net = sock_net(sk);
3138        struct xfrm_policy *xp;
3139        struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3140        struct sadb_x_sec_ctx *sec_ctx;
3141
3142        switch (sk->sk_family) {
3143        case AF_INET:
3144                if (opt != IP_IPSEC_POLICY) {
3145                        *dir = -EOPNOTSUPP;
3146                        return NULL;
3147                }
3148                break;
3149#if IS_ENABLED(CONFIG_IPV6)
3150        case AF_INET6:
3151                if (opt != IPV6_IPSEC_POLICY) {
3152                        *dir = -EOPNOTSUPP;
3153                        return NULL;
3154                }
3155                break;
3156#endif
3157        default:
3158                *dir = -EINVAL;
3159                return NULL;
3160        }
3161
3162        *dir = -EINVAL;
3163
3164        if (len < sizeof(struct sadb_x_policy) ||
3165            pol->sadb_x_policy_len*8 > len ||
3166            pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3167            (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3168                return NULL;
3169
3170        xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3171        if (xp == NULL) {
3172                *dir = -ENOBUFS;
3173                return NULL;
3174        }
3175
3176        xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3177                      XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3178
3179        xp->lft.soft_byte_limit = XFRM_INF;
3180        xp->lft.hard_byte_limit = XFRM_INF;
3181        xp->lft.soft_packet_limit = XFRM_INF;
3182        xp->lft.hard_packet_limit = XFRM_INF;
3183        xp->family = sk->sk_family;
3184
3185        xp->xfrm_nr = 0;
3186        if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3187            (*dir = parse_ipsecrequests(xp, pol)) < 0)
3188                goto out;
3189
3190        /* security context too */
3191        if (len >= (pol->sadb_x_policy_len*8 +
3192            sizeof(struct sadb_x_sec_ctx))) {
3193                char *p = (char *)pol;
3194                struct xfrm_user_sec_ctx *uctx;
3195
3196                p += pol->sadb_x_policy_len*8;
3197                sec_ctx = (struct sadb_x_sec_ctx *)p;
3198                if (len < pol->sadb_x_policy_len*8 +
3199                    sec_ctx->sadb_x_sec_len) {
3200                        *dir = -EINVAL;
3201                        goto out;
3202                }
3203                if ((*dir = verify_sec_ctx_len(p)))
3204                        goto out;
3205                uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3206                *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3207                kfree(uctx);
3208
3209                if (*dir)
3210                        goto out;
3211        }
3212
3213        *dir = pol->sadb_x_policy_dir-1;
3214        return xp;
3215
3216out:
3217        xp->walk.dead = 1;
3218        xfrm_policy_destroy(xp);
3219        return NULL;
3220}
3221
3222static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3223{
3224        struct sk_buff *skb;
3225        struct sadb_msg *hdr;
3226        struct sadb_sa *sa;
3227        struct sadb_address *addr;
3228        struct sadb_x_nat_t_port *n_port;
3229        int sockaddr_size;
3230        int size;
3231        __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3232        struct xfrm_encap_tmpl *natt = NULL;
3233
3234        sockaddr_size = pfkey_sockaddr_size(x->props.family);
3235        if (!sockaddr_size)
3236                return -EINVAL;
3237
3238        if (!satype)
3239                return -EINVAL;
3240
3241        if (!x->encap)
3242                return -EINVAL;
3243
3244        natt = x->encap;
3245
3246        /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3247         *
3248         * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3249         * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3250         */
3251
3252        size = sizeof(struct sadb_msg) +
3253                sizeof(struct sadb_sa) +
3254                (sizeof(struct sadb_address) * 2) +
3255                (sockaddr_size * 2) +
3256                (sizeof(struct sadb_x_nat_t_port) * 2);
3257
3258        skb =  alloc_skb(size + 16, GFP_ATOMIC);
3259        if (skb == NULL)
3260                return -ENOMEM;
3261
3262        hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3263        hdr->sadb_msg_version = PF_KEY_V2;
3264        hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3265        hdr->sadb_msg_satype = satype;
3266        hdr->sadb_msg_len = size / sizeof(uint64_t);
3267        hdr->sadb_msg_errno = 0;
3268        hdr->sadb_msg_reserved = 0;
3269        hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3270        hdr->sadb_msg_pid = 0;
3271
3272        /* SA */
3273        sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3274        sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3275        sa->sadb_sa_exttype = SADB_EXT_SA;
3276        sa->sadb_sa_spi = x->id.spi;
3277        sa->sadb_sa_replay = 0;
3278        sa->sadb_sa_state = 0;
3279        sa->sadb_sa_auth = 0;
3280        sa->sadb_sa_encrypt = 0;
3281        sa->sadb_sa_flags = 0;
3282
3283        /* ADDRESS_SRC (old addr) */
3284        addr = (struct sadb_address*)
3285                skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3286        addr->sadb_address_len =
3287                (sizeof(struct sadb_address)+sockaddr_size)/
3288                        sizeof(uint64_t);
3289        addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3290        addr->sadb_address_proto = 0;
3291        addr->sadb_address_reserved = 0;
3292        addr->sadb_address_prefixlen =
3293                pfkey_sockaddr_fill(&x->props.saddr, 0,
3294                                    (struct sockaddr *) (addr + 1),
3295                                    x->props.family);
3296        if (!addr->sadb_address_prefixlen)
3297                BUG();
3298
3299        /* NAT_T_SPORT (old port) */
3300        n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3301        n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3302        n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3303        n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3304        n_port->sadb_x_nat_t_port_reserved = 0;
3305
3306        /* ADDRESS_DST (new addr) */
3307        addr = (struct sadb_address*)
3308                skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3309        addr->sadb_address_len =
3310                (sizeof(struct sadb_address)+sockaddr_size)/
3311                        sizeof(uint64_t);
3312        addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3313        addr->sadb_address_proto = 0;
3314        addr->sadb_address_reserved = 0;
3315        addr->sadb_address_prefixlen =
3316                pfkey_sockaddr_fill(ipaddr, 0,
3317                                    (struct sockaddr *) (addr + 1),
3318                                    x->props.family);
3319        if (!addr->sadb_address_prefixlen)
3320                BUG();
3321
3322        /* NAT_T_DPORT (new port) */
3323        n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3324        n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3325        n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3326        n_port->sadb_x_nat_t_port_port = sport;
3327        n_port->sadb_x_nat_t_port_reserved = 0;
3328
3329        return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3330}
3331
3332#ifdef CONFIG_NET_KEY_MIGRATE
3333static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3334                            const struct xfrm_selector *sel)
3335{
3336        struct sadb_address *addr;
3337        addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3338        addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3339        addr->sadb_address_exttype = type;
3340        addr->sadb_address_proto = sel->proto;
3341        addr->sadb_address_reserved = 0;
3342
3343        switch (type) {
3344        case SADB_EXT_ADDRESS_SRC:
3345                addr->sadb_address_prefixlen = sel->prefixlen_s;
3346                pfkey_sockaddr_fill(&sel->saddr, 0,
3347                                    (struct sockaddr *)(addr + 1),
3348                                    sel->family);
3349                break;
3350        case SADB_EXT_ADDRESS_DST:
3351                addr->sadb_address_prefixlen = sel->prefixlen_d;
3352                pfkey_sockaddr_fill(&sel->daddr, 0,
3353                                    (struct sockaddr *)(addr + 1),
3354                                    sel->family);
3355                break;
3356        default:
3357                return -EINVAL;
3358        }
3359
3360        return 0;
3361}
3362
3363
3364static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3365{
3366        struct sadb_x_kmaddress *kma;
3367        u8 *sa;
3368        int family = k->family;
3369        int socklen = pfkey_sockaddr_len(family);
3370        int size_req;
3371
3372        size_req = (sizeof(struct sadb_x_kmaddress) +
3373                    pfkey_sockaddr_pair_size(family));
3374
3375        kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3376        memset(kma, 0, size_req);
3377        kma->sadb_x_kmaddress_len = size_req / 8;
3378        kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3379        kma->sadb_x_kmaddress_reserved = k->reserved;
3380
3381        sa = (u8 *)(kma + 1);
3382        if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3383            !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3384                return -EINVAL;
3385
3386        return 0;
3387}
3388
3389static int set_ipsecrequest(struct sk_buff *skb,
3390                            uint8_t proto, uint8_t mode, int level,
3391                            uint32_t reqid, uint8_t family,
3392                            const xfrm_address_t *src, const xfrm_address_t *dst)
3393{
3394        struct sadb_x_ipsecrequest *rq;
3395        u8 *sa;
3396        int socklen = pfkey_sockaddr_len(family);
3397        int size_req;
3398
3399        size_req = sizeof(struct sadb_x_ipsecrequest) +
3400                   pfkey_sockaddr_pair_size(family);
3401
3402        rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3403        memset(rq, 0, size_req);
3404        rq->sadb_x_ipsecrequest_len = size_req;
3405        rq->sadb_x_ipsecrequest_proto = proto;
3406        rq->sadb_x_ipsecrequest_mode = mode;
3407        rq->sadb_x_ipsecrequest_level = level;
3408        rq->sadb_x_ipsecrequest_reqid = reqid;
3409
3410        sa = (u8 *) (rq + 1);
3411        if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3412            !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3413                return -EINVAL;
3414
3415        return 0;
3416}
3417#endif
3418
3419#ifdef CONFIG_NET_KEY_MIGRATE
3420static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3421                              const struct xfrm_migrate *m, int num_bundles,
3422                              const struct xfrm_kmaddress *k)
3423{
3424        int i;
3425        int sasize_sel;
3426        int size = 0;
3427        int size_pol = 0;
3428        struct sk_buff *skb;
3429        struct sadb_msg *hdr;
3430        struct sadb_x_policy *pol;
3431        const struct xfrm_migrate *mp;
3432
3433        if (type != XFRM_POLICY_TYPE_MAIN)
3434                return 0;
3435
3436        if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3437                return -EINVAL;
3438
3439        if (k != NULL) {
3440                /* addresses for KM */
3441                size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3442                                     pfkey_sockaddr_pair_size(k->family));
3443        }
3444
3445        /* selector */
3446        sasize_sel = pfkey_sockaddr_size(sel->family);
3447        if (!sasize_sel)
3448                return -EINVAL;
3449        size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3450
3451        /* policy info */
3452        size_pol += sizeof(struct sadb_x_policy);
3453
3454        /* ipsecrequests */
3455        for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3456                /* old locator pair */
3457                size_pol += sizeof(struct sadb_x_ipsecrequest) +
3458                            pfkey_sockaddr_pair_size(mp->old_family);
3459                /* new locator pair */
3460                size_pol += sizeof(struct sadb_x_ipsecrequest) +
3461                            pfkey_sockaddr_pair_size(mp->new_family);
3462        }
3463
3464        size += sizeof(struct sadb_msg) + size_pol;
3465
3466        /* alloc buffer */
3467        skb = alloc_skb(size, GFP_ATOMIC);
3468        if (skb == NULL)
3469                return -ENOMEM;
3470
3471        hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3472        hdr->sadb_msg_version = PF_KEY_V2;
3473        hdr->sadb_msg_type = SADB_X_MIGRATE;
3474        hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3475        hdr->sadb_msg_len = size / 8;
3476        hdr->sadb_msg_errno = 0;
3477        hdr->sadb_msg_reserved = 0;
3478        hdr->sadb_msg_seq = 0;
3479        hdr->sadb_msg_pid = 0;
3480
3481        /* Addresses to be used by KM for negotiation, if ext is available */
3482        if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3483                goto err;
3484
3485        /* selector src */
3486        set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3487
3488        /* selector dst */
3489        set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3490
3491        /* policy information */
3492        pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3493        pol->sadb_x_policy_len = size_pol / 8;
3494        pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3495        pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3496        pol->sadb_x_policy_dir = dir + 1;
3497        pol->sadb_x_policy_id = 0;
3498        pol->sadb_x_policy_priority = 0;
3499
3500        for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3501                /* old ipsecrequest */
3502                int mode = pfkey_mode_from_xfrm(mp->mode);
3503                if (mode < 0)
3504                        goto err;
3505                if (set_ipsecrequest(skb, mp->proto, mode,
3506                                     (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3507                                     mp->reqid, mp->old_family,
3508                                     &mp->old_saddr, &mp->old_daddr) < 0)
3509                        goto err;
3510
3511                /* new ipsecrequest */
3512                if (set_ipsecrequest(skb, mp->proto, mode,
3513                                     (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3514                                     mp->reqid, mp->new_family,
3515                                     &mp->new_saddr, &mp->new_daddr) < 0)
3516                        goto err;
3517        }
3518
3519        /* broadcast migrate message to sockets */
3520        pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3521
3522        return 0;
3523
3524err:
3525        kfree_skb(skb);
3526        return -EINVAL;
3527}
3528#else
3529static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3530                              const struct xfrm_migrate *m, int num_bundles,
3531                              const struct xfrm_kmaddress *k)
3532{
3533        return -ENOPROTOOPT;
3534}
3535#endif
3536
3537static int pfkey_sendmsg(struct kiocb *kiocb,
3538                         struct socket *sock, struct msghdr *msg, size_t len)
3539{
3540        struct sock *sk = sock->sk;
3541        struct sk_buff *skb = NULL;
3542        struct sadb_msg *hdr = NULL;
3543        int err;
3544
3545        err = -EOPNOTSUPP;
3546        if (msg->msg_flags & MSG_OOB)
3547                goto out;
3548
3549        err = -EMSGSIZE;
3550        if ((unsigned int)len > sk->sk_sndbuf - 32)
3551                goto out;
3552
3553        err = -ENOBUFS;
3554        skb = alloc_skb(len, GFP_KERNEL);
3555        if (skb == NULL)
3556                goto out;
3557
3558        err = -EFAULT;
3559        if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3560                goto out;
3561
3562        hdr = pfkey_get_base_msg(skb, &err);
3563        if (!hdr)
3564                goto out;
3565
3566        mutex_lock(&xfrm_cfg_mutex);
3567        err = pfkey_process(sk, skb, hdr);
3568        mutex_unlock(&xfrm_cfg_mutex);
3569
3570out:
3571        if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3572                err = 0;
3573        kfree_skb(skb);
3574
3575        return err ? : len;
3576}
3577
3578static int pfkey_recvmsg(struct kiocb *kiocb,
3579                         struct socket *sock, struct msghdr *msg, size_t len,
3580                         int flags)
3581{
3582        struct sock *sk = sock->sk;
3583        struct pfkey_sock *pfk = pfkey_sk(sk);
3584        struct sk_buff *skb;
3585        int copied, err;
3586
3587        err = -EINVAL;
3588        if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3589                goto out;
3590
3591        msg->msg_namelen = 0;
3592        skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3593        if (skb == NULL)
3594                goto out;
3595
3596        copied = skb->len;
3597        if (copied > len) {
3598                msg->msg_flags |= MSG_TRUNC;
3599                copied = len;
3600        }
3601
3602        skb_reset_transport_header(skb);
3603        err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3604        if (err)
3605                goto out_free;
3606
3607        sock_recv_ts_and_drops(msg, sk, skb);
3608
3609        err = (flags & MSG_TRUNC) ? skb->len : copied;
3610
3611        if (pfk->dump.dump != NULL &&
3612            3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3613                pfkey_do_dump(pfk);
3614
3615out_free:
3616        skb_free_datagram(sk, skb);
3617out:
3618        return err;
3619}
3620
3621static const struct proto_ops pfkey_ops = {
3622        .family         =       PF_KEY,
3623        .owner          =       THIS_MODULE,
3624        /* Operations that make no sense on pfkey sockets. */
3625        .bind           =       sock_no_bind,
3626        .connect        =       sock_no_connect,
3627        .socketpair     =       sock_no_socketpair,
3628        .accept         =       sock_no_accept,
3629        .getname        =       sock_no_getname,
3630        .ioctl          =       sock_no_ioctl,
3631        .listen         =       sock_no_listen,
3632        .shutdown       =       sock_no_shutdown,
3633        .setsockopt     =       sock_no_setsockopt,
3634        .getsockopt     =       sock_no_getsockopt,
3635        .mmap           =       sock_no_mmap,
3636        .sendpage       =       sock_no_sendpage,
3637
3638        /* Now the operations that really occur. */
3639        .release        =       pfkey_release,
3640        .poll           =       datagram_poll,
3641        .sendmsg        =       pfkey_sendmsg,
3642        .recvmsg        =       pfkey_recvmsg,
3643};
3644
3645static const struct net_proto_family pfkey_family_ops = {
3646        .family =       PF_KEY,
3647        .create =       pfkey_create,
3648        .owner  =       THIS_MODULE,
3649};
3650
3651#ifdef CONFIG_PROC_FS
3652static int pfkey_seq_show(struct seq_file *f, void *v)
3653{
3654        struct sock *s = sk_entry(v);
3655
3656        if (v == SEQ_START_TOKEN)
3657                seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3658        else
3659                seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3660                               s,
3661                               atomic_read(&s->sk_refcnt),
3662                               sk_rmem_alloc_get(s),
3663                               sk_wmem_alloc_get(s),
3664                               sock_i_uid(s),
3665                               sock_i_ino(s)
3666                               );
3667        return 0;
3668}
3669
3670static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3671        __acquires(rcu)
3672{
3673        struct net *net = seq_file_net(f);
3674        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3675
3676        rcu_read_lock();
3677        return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3678}
3679
3680static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3681{
3682        struct net *net = seq_file_net(f);
3683        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3684
3685        return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3686}
3687
3688static void pfkey_seq_stop(struct seq_file *f, void *v)
3689        __releases(rcu)
3690{
3691        rcu_read_unlock();
3692}
3693
3694static const struct seq_operations pfkey_seq_ops = {
3695        .start  = pfkey_seq_start,
3696        .next   = pfkey_seq_next,
3697        .stop   = pfkey_seq_stop,
3698        .show   = pfkey_seq_show,
3699};
3700
3701static int pfkey_seq_open(struct inode *inode, struct file *file)
3702{
3703        return seq_open_net(inode, file, &pfkey_seq_ops,
3704                            sizeof(struct seq_net_private));
3705}
3706
3707static const struct file_operations pfkey_proc_ops = {
3708        .open    = pfkey_seq_open,
3709        .read    = seq_read,
3710        .llseek  = seq_lseek,
3711        .release = seq_release_net,
3712};
3713
3714static int __net_init pfkey_init_proc(struct net *net)
3715{
3716        struct proc_dir_entry *e;
3717
3718        e = proc_net_fops_create(net, "pfkey", 0, &pfkey_proc_ops);
3719        if (e == NULL)
3720                return -ENOMEM;
3721
3722        return 0;
3723}
3724
3725static void __net_exit pfkey_exit_proc(struct net *net)
3726{
3727        proc_net_remove(net, "pfkey");
3728}
3729#else
3730static inline int pfkey_init_proc(struct net *net)
3731{
3732        return 0;
3733}
3734
3735static inline void pfkey_exit_proc(struct net *net)
3736{
3737}
3738#endif
3739
3740static struct xfrm_mgr pfkeyv2_mgr =
3741{
3742        .id             = "pfkeyv2",
3743        .notify         = pfkey_send_notify,
3744        .acquire        = pfkey_send_acquire,
3745        .compile_policy = pfkey_compile_policy,
3746        .new_mapping    = pfkey_send_new_mapping,
3747        .notify_policy  = pfkey_send_policy_notify,
3748        .migrate        = pfkey_send_migrate,
3749};
3750
3751static int __net_init pfkey_net_init(struct net *net)
3752{
3753        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3754        int rv;
3755
3756        INIT_HLIST_HEAD(&net_pfkey->table);
3757        atomic_set(&net_pfkey->socks_nr, 0);
3758
3759        rv = pfkey_init_proc(net);
3760
3761        return rv;
3762}
3763
3764static void __net_exit pfkey_net_exit(struct net *net)
3765{
3766        struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3767
3768        pfkey_exit_proc(net);
3769        BUG_ON(!hlist_empty(&net_pfkey->table));
3770}
3771
3772static struct pernet_operations pfkey_net_ops = {
3773        .init = pfkey_net_init,
3774        .exit = pfkey_net_exit,
3775        .id   = &pfkey_net_id,
3776        .size = sizeof(struct netns_pfkey),
3777};
3778
3779static void __exit ipsec_pfkey_exit(void)
3780{
3781        xfrm_unregister_km(&pfkeyv2_mgr);
3782        sock_unregister(PF_KEY);
3783        unregister_pernet_subsys(&pfkey_net_ops);
3784        proto_unregister(&key_proto);
3785}
3786
3787static int __init ipsec_pfkey_init(void)
3788{
3789        int err = proto_register(&key_proto, 0);
3790
3791        if (err != 0)
3792                goto out;
3793
3794        err = register_pernet_subsys(&pfkey_net_ops);
3795        if (err != 0)
3796                goto out_unregister_key_proto;
3797        err = sock_register(&pfkey_family_ops);
3798        if (err != 0)
3799                goto out_unregister_pernet;
3800        err = xfrm_register_km(&pfkeyv2_mgr);
3801        if (err != 0)
3802                goto out_sock_unregister;
3803out:
3804        return err;
3805
3806out_sock_unregister:
3807        sock_unregister(PF_KEY);
3808out_unregister_pernet:
3809        unregister_pernet_subsys(&pfkey_net_ops);
3810out_unregister_key_proto:
3811        proto_unregister(&key_proto);
3812        goto out;
3813}
3814
3815module_init(ipsec_pfkey_init);
3816module_exit(ipsec_pfkey_exit);
3817MODULE_LICENSE("GPL");
3818MODULE_ALIAS_NETPROTO(PF_KEY);
3819
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.