linux/net/sunrpc/svcsock.c
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   1/*
   2 * linux/net/sunrpc/svcsock.c
   3 *
   4 * These are the RPC server socket internals.
   5 *
   6 * The server scheduling algorithm does not always distribute the load
   7 * evenly when servicing a single client. May need to modify the
   8 * svc_xprt_enqueue procedure...
   9 *
  10 * TCP support is largely untested and may be a little slow. The problem
  11 * is that we currently do two separate recvfrom's, one for the 4-byte
  12 * record length, and the second for the actual record. This could possibly
  13 * be improved by always reading a minimum size of around 100 bytes and
  14 * tucking any superfluous bytes away in a temporary store. Still, that
  15 * leaves write requests out in the rain. An alternative may be to peek at
  16 * the first skb in the queue, and if it matches the next TCP sequence
  17 * number, to extract the record marker. Yuck.
  18 *
  19 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  20 */
  21
  22#include <linux/kernel.h>
  23#include <linux/sched.h>
  24#include <linux/module.h>
  25#include <linux/errno.h>
  26#include <linux/fcntl.h>
  27#include <linux/net.h>
  28#include <linux/in.h>
  29#include <linux/inet.h>
  30#include <linux/udp.h>
  31#include <linux/tcp.h>
  32#include <linux/unistd.h>
  33#include <linux/slab.h>
  34#include <linux/netdevice.h>
  35#include <linux/skbuff.h>
  36#include <linux/file.h>
  37#include <linux/freezer.h>
  38#include <net/sock.h>
  39#include <net/checksum.h>
  40#include <net/ip.h>
  41#include <net/ipv6.h>
  42#include <net/tcp.h>
  43#include <net/tcp_states.h>
  44#include <asm/uaccess.h>
  45#include <asm/ioctls.h>
  46#include <trace/events/skb.h>
  47
  48#include <linux/sunrpc/types.h>
  49#include <linux/sunrpc/clnt.h>
  50#include <linux/sunrpc/xdr.h>
  51#include <linux/sunrpc/msg_prot.h>
  52#include <linux/sunrpc/svcsock.h>
  53#include <linux/sunrpc/stats.h>
  54#include <linux/sunrpc/xprt.h>
  55
  56#include "sunrpc.h"
  57
  58#define RPCDBG_FACILITY RPCDBG_SVCXPRT
  59
  60
  61static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
  62                                         int flags);
  63static void             svc_udp_data_ready(struct sock *, int);
  64static int              svc_udp_recvfrom(struct svc_rqst *);
  65static int              svc_udp_sendto(struct svc_rqst *);
  66static void             svc_sock_detach(struct svc_xprt *);
  67static void             svc_tcp_sock_detach(struct svc_xprt *);
  68static void             svc_sock_free(struct svc_xprt *);
  69
  70static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
  71                                          struct net *, struct sockaddr *,
  72                                          int, int);
  73#if defined(CONFIG_SUNRPC_BACKCHANNEL)
  74static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
  75                                             struct net *, struct sockaddr *,
  76                                             int, int);
  77static void svc_bc_sock_free(struct svc_xprt *xprt);
  78#endif /* CONFIG_SUNRPC_BACKCHANNEL */
  79
  80#ifdef CONFIG_DEBUG_LOCK_ALLOC
  81static struct lock_class_key svc_key[2];
  82static struct lock_class_key svc_slock_key[2];
  83
  84static void svc_reclassify_socket(struct socket *sock)
  85{
  86        struct sock *sk = sock->sk;
  87        BUG_ON(sock_owned_by_user(sk));
  88        switch (sk->sk_family) {
  89        case AF_INET:
  90                sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
  91                                              &svc_slock_key[0],
  92                                              "sk_xprt.xpt_lock-AF_INET-NFSD",
  93                                              &svc_key[0]);
  94                break;
  95
  96        case AF_INET6:
  97                sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
  98                                              &svc_slock_key[1],
  99                                              "sk_xprt.xpt_lock-AF_INET6-NFSD",
 100                                              &svc_key[1]);
 101                break;
 102
 103        default:
 104                BUG();
 105        }
 106}
 107#else
 108static void svc_reclassify_socket(struct socket *sock)
 109{
 110}
 111#endif
 112
 113/*
 114 * Release an skbuff after use
 115 */
 116static void svc_release_skb(struct svc_rqst *rqstp)
 117{
 118        struct sk_buff *skb = rqstp->rq_xprt_ctxt;
 119
 120        if (skb) {
 121                struct svc_sock *svsk =
 122                        container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
 123                rqstp->rq_xprt_ctxt = NULL;
 124
 125                dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
 126                skb_free_datagram_locked(svsk->sk_sk, skb);
 127        }
 128}
 129
 130union svc_pktinfo_u {
 131        struct in_pktinfo pkti;
 132        struct in6_pktinfo pkti6;
 133};
 134#define SVC_PKTINFO_SPACE \
 135        CMSG_SPACE(sizeof(union svc_pktinfo_u))
 136
 137static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
 138{
 139        struct svc_sock *svsk =
 140                container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
 141        switch (svsk->sk_sk->sk_family) {
 142        case AF_INET: {
 143                        struct in_pktinfo *pki = CMSG_DATA(cmh);
 144
 145                        cmh->cmsg_level = SOL_IP;
 146                        cmh->cmsg_type = IP_PKTINFO;
 147                        pki->ipi_ifindex = 0;
 148                        pki->ipi_spec_dst.s_addr =
 149                                 svc_daddr_in(rqstp)->sin_addr.s_addr;
 150                        cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
 151                }
 152                break;
 153
 154        case AF_INET6: {
 155                        struct in6_pktinfo *pki = CMSG_DATA(cmh);
 156                        struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
 157
 158                        cmh->cmsg_level = SOL_IPV6;
 159                        cmh->cmsg_type = IPV6_PKTINFO;
 160                        pki->ipi6_ifindex = daddr->sin6_scope_id;
 161                        pki->ipi6_addr = daddr->sin6_addr;
 162                        cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
 163                }
 164                break;
 165        }
 166}
 167
 168/*
 169 * send routine intended to be shared by the fore- and back-channel
 170 */
 171int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
 172                    struct page *headpage, unsigned long headoffset,
 173                    struct page *tailpage, unsigned long tailoffset)
 174{
 175        int             result;
 176        int             size;
 177        struct page     **ppage = xdr->pages;
 178        size_t          base = xdr->page_base;
 179        unsigned int    pglen = xdr->page_len;
 180        unsigned int    flags = MSG_MORE;
 181        int             slen;
 182        int             len = 0;
 183
 184        slen = xdr->len;
 185
 186        /* send head */
 187        if (slen == xdr->head[0].iov_len)
 188                flags = 0;
 189        len = kernel_sendpage(sock, headpage, headoffset,
 190                                  xdr->head[0].iov_len, flags);
 191        if (len != xdr->head[0].iov_len)
 192                goto out;
 193        slen -= xdr->head[0].iov_len;
 194        if (slen == 0)
 195                goto out;
 196
 197        /* send page data */
 198        size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
 199        while (pglen > 0) {
 200                if (slen == size)
 201                        flags = 0;
 202                result = kernel_sendpage(sock, *ppage, base, size, flags);
 203                if (result > 0)
 204                        len += result;
 205                if (result != size)
 206                        goto out;
 207                slen -= size;
 208                pglen -= size;
 209                size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
 210                base = 0;
 211                ppage++;
 212        }
 213
 214        /* send tail */
 215        if (xdr->tail[0].iov_len) {
 216                result = kernel_sendpage(sock, tailpage, tailoffset,
 217                                   xdr->tail[0].iov_len, 0);
 218                if (result > 0)
 219                        len += result;
 220        }
 221
 222out:
 223        return len;
 224}
 225
 226
 227/*
 228 * Generic sendto routine
 229 */
 230static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
 231{
 232        struct svc_sock *svsk =
 233                container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
 234        struct socket   *sock = svsk->sk_sock;
 235        union {
 236                struct cmsghdr  hdr;
 237                long            all[SVC_PKTINFO_SPACE / sizeof(long)];
 238        } buffer;
 239        struct cmsghdr *cmh = &buffer.hdr;
 240        int             len = 0;
 241        unsigned long tailoff;
 242        unsigned long headoff;
 243        RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
 244
 245        if (rqstp->rq_prot == IPPROTO_UDP) {
 246                struct msghdr msg = {
 247                        .msg_name       = &rqstp->rq_addr,
 248                        .msg_namelen    = rqstp->rq_addrlen,
 249                        .msg_control    = cmh,
 250                        .msg_controllen = sizeof(buffer),
 251                        .msg_flags      = MSG_MORE,
 252                };
 253
 254                svc_set_cmsg_data(rqstp, cmh);
 255
 256                if (sock_sendmsg(sock, &msg, 0) < 0)
 257                        goto out;
 258        }
 259
 260        tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
 261        headoff = 0;
 262        len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
 263                               rqstp->rq_respages[0], tailoff);
 264
 265out:
 266        dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
 267                svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
 268                xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
 269
 270        return len;
 271}
 272
 273/*
 274 * Report socket names for nfsdfs
 275 */
 276static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
 277{
 278        const struct sock *sk = svsk->sk_sk;
 279        const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
 280                                                        "udp" : "tcp";
 281        int len;
 282
 283        switch (sk->sk_family) {
 284        case PF_INET:
 285                len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
 286                                proto_name,
 287                                &inet_sk(sk)->inet_rcv_saddr,
 288                                inet_sk(sk)->inet_num);
 289                break;
 290        case PF_INET6:
 291                len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
 292                                proto_name,
 293                                &inet6_sk(sk)->rcv_saddr,
 294                                inet_sk(sk)->inet_num);
 295                break;
 296        default:
 297                len = snprintf(buf, remaining, "*unknown-%d*\n",
 298                                sk->sk_family);
 299        }
 300
 301        if (len >= remaining) {
 302                *buf = '\0';
 303                return -ENAMETOOLONG;
 304        }
 305        return len;
 306}
 307
 308/*
 309 * Check input queue length
 310 */
 311static int svc_recv_available(struct svc_sock *svsk)
 312{
 313        struct socket   *sock = svsk->sk_sock;
 314        int             avail, err;
 315
 316        err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
 317
 318        return (err >= 0)? avail : err;
 319}
 320
 321/*
 322 * Generic recvfrom routine.
 323 */
 324static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
 325                        int buflen)
 326{
 327        struct svc_sock *svsk =
 328                container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
 329        struct msghdr msg = {
 330                .msg_flags      = MSG_DONTWAIT,
 331        };
 332        int len;
 333
 334        rqstp->rq_xprt_hlen = 0;
 335
 336        len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
 337                                msg.msg_flags);
 338
 339        dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
 340                svsk, iov[0].iov_base, iov[0].iov_len, len);
 341        return len;
 342}
 343
 344static int svc_partial_recvfrom(struct svc_rqst *rqstp,
 345                                struct kvec *iov, int nr,
 346                                int buflen, unsigned int base)
 347{
 348        size_t save_iovlen;
 349        void *save_iovbase;
 350        unsigned int i;
 351        int ret;
 352
 353        if (base == 0)
 354                return svc_recvfrom(rqstp, iov, nr, buflen);
 355
 356        for (i = 0; i < nr; i++) {
 357                if (iov[i].iov_len > base)
 358                        break;
 359                base -= iov[i].iov_len;
 360        }
 361        save_iovlen = iov[i].iov_len;
 362        save_iovbase = iov[i].iov_base;
 363        iov[i].iov_len -= base;
 364        iov[i].iov_base += base;
 365        ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
 366        iov[i].iov_len = save_iovlen;
 367        iov[i].iov_base = save_iovbase;
 368        return ret;
 369}
 370
 371/*
 372 * Set socket snd and rcv buffer lengths
 373 */
 374static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
 375                                unsigned int rcv)
 376{
 377#if 0
 378        mm_segment_t    oldfs;
 379        oldfs = get_fs(); set_fs(KERNEL_DS);
 380        sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
 381                        (char*)&snd, sizeof(snd));
 382        sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
 383                        (char*)&rcv, sizeof(rcv));
 384#else
 385        /* sock_setsockopt limits use to sysctl_?mem_max,
 386         * which isn't acceptable.  Until that is made conditional
 387         * on not having CAP_SYS_RESOURCE or similar, we go direct...
 388         * DaveM said I could!
 389         */
 390        lock_sock(sock->sk);
 391        sock->sk->sk_sndbuf = snd * 2;
 392        sock->sk->sk_rcvbuf = rcv * 2;
 393        sock->sk->sk_write_space(sock->sk);
 394        release_sock(sock->sk);
 395#endif
 396}
 397/*
 398 * INET callback when data has been received on the socket.
 399 */
 400static void svc_udp_data_ready(struct sock *sk, int count)
 401{
 402        struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
 403        wait_queue_head_t *wq = sk_sleep(sk);
 404
 405        if (svsk) {
 406                dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
 407                        svsk, sk, count,
 408                        test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
 409                set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
 410                svc_xprt_enqueue(&svsk->sk_xprt);
 411        }
 412        if (wq && waitqueue_active(wq))
 413                wake_up_interruptible(wq);
 414}
 415
 416/*
 417 * INET callback when space is newly available on the socket.
 418 */
 419static void svc_write_space(struct sock *sk)
 420{
 421        struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
 422        wait_queue_head_t *wq = sk_sleep(sk);
 423
 424        if (svsk) {
 425                dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
 426                        svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
 427                svc_xprt_enqueue(&svsk->sk_xprt);
 428        }
 429
 430        if (wq && waitqueue_active(wq)) {
 431                dprintk("RPC svc_write_space: someone sleeping on %p\n",
 432                       svsk);
 433                wake_up_interruptible(wq);
 434        }
 435}
 436
 437static void svc_tcp_write_space(struct sock *sk)
 438{
 439        struct socket *sock = sk->sk_socket;
 440
 441        if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock)
 442                clear_bit(SOCK_NOSPACE, &sock->flags);
 443        svc_write_space(sk);
 444}
 445
 446/*
 447 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
 448 */
 449static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
 450                                     struct cmsghdr *cmh)
 451{
 452        struct in_pktinfo *pki = CMSG_DATA(cmh);
 453        struct sockaddr_in *daddr = svc_daddr_in(rqstp);
 454
 455        if (cmh->cmsg_type != IP_PKTINFO)
 456                return 0;
 457
 458        daddr->sin_family = AF_INET;
 459        daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
 460        return 1;
 461}
 462
 463/*
 464 * See net/ipv6/datagram.c : datagram_recv_ctl
 465 */
 466static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
 467                                     struct cmsghdr *cmh)
 468{
 469        struct in6_pktinfo *pki = CMSG_DATA(cmh);
 470        struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
 471
 472        if (cmh->cmsg_type != IPV6_PKTINFO)
 473                return 0;
 474
 475        daddr->sin6_family = AF_INET6;
 476        daddr->sin6_addr = pki->ipi6_addr;
 477        daddr->sin6_scope_id = pki->ipi6_ifindex;
 478        return 1;
 479}
 480
 481/*
 482 * Copy the UDP datagram's destination address to the rqstp structure.
 483 * The 'destination' address in this case is the address to which the
 484 * peer sent the datagram, i.e. our local address. For multihomed
 485 * hosts, this can change from msg to msg. Note that only the IP
 486 * address changes, the port number should remain the same.
 487 */
 488static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
 489                                    struct cmsghdr *cmh)
 490{
 491        switch (cmh->cmsg_level) {
 492        case SOL_IP:
 493                return svc_udp_get_dest_address4(rqstp, cmh);
 494        case SOL_IPV6:
 495                return svc_udp_get_dest_address6(rqstp, cmh);
 496        }
 497
 498        return 0;
 499}
 500
 501/*
 502 * Receive a datagram from a UDP socket.
 503 */
 504static int svc_udp_recvfrom(struct svc_rqst *rqstp)
 505{
 506        struct svc_sock *svsk =
 507                container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
 508        struct svc_serv *serv = svsk->sk_xprt.xpt_server;
 509        struct sk_buff  *skb;
 510        union {
 511                struct cmsghdr  hdr;
 512                long            all[SVC_PKTINFO_SPACE / sizeof(long)];
 513        } buffer;
 514        struct cmsghdr *cmh = &buffer.hdr;
 515        struct msghdr msg = {
 516                .msg_name = svc_addr(rqstp),
 517                .msg_control = cmh,
 518                .msg_controllen = sizeof(buffer),
 519                .msg_flags = MSG_DONTWAIT,
 520        };
 521        size_t len;
 522        int err;
 523
 524        if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
 525            /* udp sockets need large rcvbuf as all pending
 526             * requests are still in that buffer.  sndbuf must
 527             * also be large enough that there is enough space
 528             * for one reply per thread.  We count all threads
 529             * rather than threads in a particular pool, which
 530             * provides an upper bound on the number of threads
 531             * which will access the socket.
 532             */
 533            svc_sock_setbufsize(svsk->sk_sock,
 534                                (serv->sv_nrthreads+3) * serv->sv_max_mesg,
 535                                (serv->sv_nrthreads+3) * serv->sv_max_mesg);
 536
 537        clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
 538        skb = NULL;
 539        err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
 540                             0, 0, MSG_PEEK | MSG_DONTWAIT);
 541        if (err >= 0)
 542                skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
 543
 544        if (skb == NULL) {
 545                if (err != -EAGAIN) {
 546                        /* possibly an icmp error */
 547                        dprintk("svc: recvfrom returned error %d\n", -err);
 548                        set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
 549                }
 550                return 0;
 551        }
 552        len = svc_addr_len(svc_addr(rqstp));
 553        rqstp->rq_addrlen = len;
 554        if (skb->tstamp.tv64 == 0) {
 555                skb->tstamp = ktime_get_real();
 556                /* Don't enable netstamp, sunrpc doesn't
 557                   need that much accuracy */
 558        }
 559        svsk->sk_sk->sk_stamp = skb->tstamp;
 560        set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
 561
 562        len  = skb->len - sizeof(struct udphdr);
 563        rqstp->rq_arg.len = len;
 564
 565        rqstp->rq_prot = IPPROTO_UDP;
 566
 567        if (!svc_udp_get_dest_address(rqstp, cmh)) {
 568                net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
 569                                     cmh->cmsg_level, cmh->cmsg_type);
 570                goto out_free;
 571        }
 572        rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
 573
 574        if (skb_is_nonlinear(skb)) {
 575                /* we have to copy */
 576                local_bh_disable();
 577                if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
 578                        local_bh_enable();
 579                        /* checksum error */
 580                        goto out_free;
 581                }
 582                local_bh_enable();
 583                skb_free_datagram_locked(svsk->sk_sk, skb);
 584        } else {
 585                /* we can use it in-place */
 586                rqstp->rq_arg.head[0].iov_base = skb->data +
 587                        sizeof(struct udphdr);
 588                rqstp->rq_arg.head[0].iov_len = len;
 589                if (skb_checksum_complete(skb))
 590                        goto out_free;
 591                rqstp->rq_xprt_ctxt = skb;
 592        }
 593
 594        rqstp->rq_arg.page_base = 0;
 595        if (len <= rqstp->rq_arg.head[0].iov_len) {
 596                rqstp->rq_arg.head[0].iov_len = len;
 597                rqstp->rq_arg.page_len = 0;
 598                rqstp->rq_respages = rqstp->rq_pages+1;
 599        } else {
 600                rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
 601                rqstp->rq_respages = rqstp->rq_pages + 1 +
 602                        DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
 603        }
 604
 605        if (serv->sv_stats)
 606                serv->sv_stats->netudpcnt++;
 607
 608        return len;
 609out_free:
 610        trace_kfree_skb(skb, svc_udp_recvfrom);
 611        skb_free_datagram_locked(svsk->sk_sk, skb);
 612        return 0;
 613}
 614
 615static int
 616svc_udp_sendto(struct svc_rqst *rqstp)
 617{
 618        int             error;
 619
 620        error = svc_sendto(rqstp, &rqstp->rq_res);
 621        if (error == -ECONNREFUSED)
 622                /* ICMP error on earlier request. */
 623                error = svc_sendto(rqstp, &rqstp->rq_res);
 624
 625        return error;
 626}
 627
 628static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
 629{
 630}
 631
 632static int svc_udp_has_wspace(struct svc_xprt *xprt)
 633{
 634        struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
 635        struct svc_serv *serv = xprt->xpt_server;
 636        unsigned long required;
 637
 638        /*
 639         * Set the SOCK_NOSPACE flag before checking the available
 640         * sock space.
 641         */
 642        set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
 643        required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
 644        if (required*2 > sock_wspace(svsk->sk_sk))
 645                return 0;
 646        clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
 647        return 1;
 648}
 649
 650static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
 651{
 652        BUG();
 653        return NULL;
 654}
 655
 656static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
 657                                       struct net *net,
 658                                       struct sockaddr *sa, int salen,
 659                                       int flags)
 660{
 661        return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
 662}
 663
 664static struct svc_xprt_ops svc_udp_ops = {
 665        .xpo_create = svc_udp_create,
 666        .xpo_recvfrom = svc_udp_recvfrom,
 667        .xpo_sendto = svc_udp_sendto,
 668        .xpo_release_rqst = svc_release_skb,
 669        .xpo_detach = svc_sock_detach,
 670        .xpo_free = svc_sock_free,
 671        .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
 672        .xpo_has_wspace = svc_udp_has_wspace,
 673        .xpo_accept = svc_udp_accept,
 674};
 675
 676static struct svc_xprt_class svc_udp_class = {
 677        .xcl_name = "udp",
 678        .xcl_owner = THIS_MODULE,
 679        .xcl_ops = &svc_udp_ops,
 680        .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
 681};
 682
 683static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
 684{
 685        int err, level, optname, one = 1;
 686
 687        svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
 688                      &svsk->sk_xprt, serv);
 689        clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
 690        svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
 691        svsk->sk_sk->sk_write_space = svc_write_space;
 692
 693        /* initialise setting must have enough space to
 694         * receive and respond to one request.
 695         * svc_udp_recvfrom will re-adjust if necessary
 696         */
 697        svc_sock_setbufsize(svsk->sk_sock,
 698                            3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
 699                            3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
 700
 701        /* data might have come in before data_ready set up */
 702        set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
 703        set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
 704
 705        /* make sure we get destination address info */
 706        switch (svsk->sk_sk->sk_family) {
 707        case AF_INET:
 708                level = SOL_IP;
 709                optname = IP_PKTINFO;
 710                break;
 711        case AF_INET6:
 712                level = SOL_IPV6;
 713                optname = IPV6_RECVPKTINFO;
 714                break;
 715        default:
 716                BUG();
 717        }
 718        err = kernel_setsockopt(svsk->sk_sock, level, optname,
 719                                        (char *)&one, sizeof(one));
 720        dprintk("svc: kernel_setsockopt returned %d\n", err);
 721}
 722
 723/*
 724 * A data_ready event on a listening socket means there's a connection
 725 * pending. Do not use state_change as a substitute for it.
 726 */
 727static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
 728{
 729        struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
 730        wait_queue_head_t *wq;
 731
 732        dprintk("svc: socket %p TCP (listen) state change %d\n",
 733                sk, sk->sk_state);
 734
 735        /*
 736         * This callback may called twice when a new connection
 737         * is established as a child socket inherits everything
 738         * from a parent LISTEN socket.
 739         * 1) data_ready method of the parent socket will be called
 740         *    when one of child sockets become ESTABLISHED.
 741         * 2) data_ready method of the child socket may be called
 742         *    when it receives data before the socket is accepted.
 743         * In case of 2, we should ignore it silently.
 744         */
 745        if (sk->sk_state == TCP_LISTEN) {
 746                if (svsk) {
 747                        set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
 748                        svc_xprt_enqueue(&svsk->sk_xprt);
 749                } else
 750                        printk("svc: socket %p: no user data\n", sk);
 751        }
 752
 753        wq = sk_sleep(sk);
 754        if (wq && waitqueue_active(wq))
 755                wake_up_interruptible_all(wq);
 756}
 757
 758/*
 759 * A state change on a connected socket means it's dying or dead.
 760 */
 761static void svc_tcp_state_change(struct sock *sk)
 762{
 763        struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
 764        wait_queue_head_t *wq = sk_sleep(sk);
 765
 766        dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
 767                sk, sk->sk_state, sk->sk_user_data);
 768
 769        if (!svsk)
 770                printk("svc: socket %p: no user data\n", sk);
 771        else {
 772                set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
 773                svc_xprt_enqueue(&svsk->sk_xprt);
 774        }
 775        if (wq && waitqueue_active(wq))
 776                wake_up_interruptible_all(wq);
 777}
 778
 779static void svc_tcp_data_ready(struct sock *sk, int count)
 780{
 781        struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
 782        wait_queue_head_t *wq = sk_sleep(sk);
 783
 784        dprintk("svc: socket %p TCP data ready (svsk %p)\n",
 785                sk, sk->sk_user_data);
 786        if (svsk) {
 787                set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
 788                svc_xprt_enqueue(&svsk->sk_xprt);
 789        }
 790        if (wq && waitqueue_active(wq))
 791                wake_up_interruptible(wq);
 792}
 793
 794/*
 795 * Accept a TCP connection
 796 */
 797static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
 798{
 799        struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
 800        struct sockaddr_storage addr;
 801        struct sockaddr *sin = (struct sockaddr *) &addr;
 802        struct svc_serv *serv = svsk->sk_xprt.xpt_server;
 803        struct socket   *sock = svsk->sk_sock;
 804        struct socket   *newsock;
 805        struct svc_sock *newsvsk;
 806        int             err, slen;
 807        RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
 808
 809        dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
 810        if (!sock)
 811                return NULL;
 812
 813        clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
 814        err = kernel_accept(sock, &newsock, O_NONBLOCK);
 815        if (err < 0) {
 816                if (err == -ENOMEM)
 817                        printk(KERN_WARNING "%s: no more sockets!\n",
 818                               serv->sv_name);
 819                else if (err != -EAGAIN)
 820                        net_warn_ratelimited("%s: accept failed (err %d)!\n",
 821                                             serv->sv_name, -err);
 822                return NULL;
 823        }
 824        set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
 825
 826        err = kernel_getpeername(newsock, sin, &slen);
 827        if (err < 0) {
 828                net_warn_ratelimited("%s: peername failed (err %d)!\n",
 829                                     serv->sv_name, -err);
 830                goto failed;            /* aborted connection or whatever */
 831        }
 832
 833        /* Ideally, we would want to reject connections from unauthorized
 834         * hosts here, but when we get encryption, the IP of the host won't
 835         * tell us anything.  For now just warn about unpriv connections.
 836         */
 837        if (!svc_port_is_privileged(sin)) {
 838                dprintk(KERN_WARNING
 839                        "%s: connect from unprivileged port: %s\n",
 840                        serv->sv_name,
 841                        __svc_print_addr(sin, buf, sizeof(buf)));
 842        }
 843        dprintk("%s: connect from %s\n", serv->sv_name,
 844                __svc_print_addr(sin, buf, sizeof(buf)));
 845
 846        /* make sure that a write doesn't block forever when
 847         * low on memory
 848         */
 849        newsock->sk->sk_sndtimeo = HZ*30;
 850
 851        newsvsk = svc_setup_socket(serv, newsock,
 852                                 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
 853        if (IS_ERR(newsvsk))
 854                goto failed;
 855        svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
 856        err = kernel_getsockname(newsock, sin, &slen);
 857        if (unlikely(err < 0)) {
 858                dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
 859                slen = offsetof(struct sockaddr, sa_data);
 860        }
 861        svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
 862
 863        if (serv->sv_stats)
 864                serv->sv_stats->nettcpconn++;
 865
 866        return &newsvsk->sk_xprt;
 867
 868failed:
 869        sock_release(newsock);
 870        return NULL;
 871}
 872
 873static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
 874{
 875        unsigned int i, len, npages;
 876
 877        if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
 878                return 0;
 879        len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
 880        npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
 881        for (i = 0; i < npages; i++) {
 882                if (rqstp->rq_pages[i] != NULL)
 883                        put_page(rqstp->rq_pages[i]);
 884                BUG_ON(svsk->sk_pages[i] == NULL);
 885                rqstp->rq_pages[i] = svsk->sk_pages[i];
 886                svsk->sk_pages[i] = NULL;
 887        }
 888        rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
 889        return len;
 890}
 891
 892static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
 893{
 894        unsigned int i, len, npages;
 895
 896        if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
 897                return;
 898        len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
 899        npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
 900        for (i = 0; i < npages; i++) {
 901                svsk->sk_pages[i] = rqstp->rq_pages[i];
 902                rqstp->rq_pages[i] = NULL;
 903        }
 904}
 905
 906static void svc_tcp_clear_pages(struct svc_sock *svsk)
 907{
 908        unsigned int i, len, npages;
 909
 910        if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
 911                goto out;
 912        len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
 913        npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
 914        for (i = 0; i < npages; i++) {
 915                BUG_ON(svsk->sk_pages[i] == NULL);
 916                put_page(svsk->sk_pages[i]);
 917                svsk->sk_pages[i] = NULL;
 918        }
 919out:
 920        svsk->sk_tcplen = 0;
 921}
 922
 923/*
 924 * Receive data.
 925 * If we haven't gotten the record length yet, get the next four bytes.
 926 * Otherwise try to gobble up as much as possible up to the complete
 927 * record length.
 928 */
 929static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
 930{
 931        struct svc_serv *serv = svsk->sk_xprt.xpt_server;
 932        unsigned int want;
 933        int len;
 934
 935        clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
 936
 937        if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
 938                struct kvec     iov;
 939
 940                want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
 941                iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
 942                iov.iov_len  = want;
 943                if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
 944                        goto error;
 945                svsk->sk_tcplen += len;
 946
 947                if (len < want) {
 948                        dprintk("svc: short recvfrom while reading record "
 949                                "length (%d of %d)\n", len, want);
 950                        return -EAGAIN;
 951                }
 952
 953                svsk->sk_reclen = ntohl(svsk->sk_reclen);
 954                if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) {
 955                        /* FIXME: technically, a record can be fragmented,
 956                         *  and non-terminal fragments will not have the top
 957                         *  bit set in the fragment length header.
 958                         *  But apparently no known nfs clients send fragmented
 959                         *  records. */
 960                        net_notice_ratelimited("RPC: multiple fragments per record not supported\n");
 961                        goto err_delete;
 962                }
 963
 964                svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK;
 965                dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
 966                if (svsk->sk_reclen > serv->sv_max_mesg) {
 967                        net_notice_ratelimited("RPC: fragment too large: 0x%08lx\n",
 968                                               (unsigned long)svsk->sk_reclen);
 969                        goto err_delete;
 970                }
 971        }
 972
 973        if (svsk->sk_reclen < 8)
 974                goto err_delete; /* client is nuts. */
 975
 976        len = svsk->sk_reclen;
 977
 978        return len;
 979error:
 980        dprintk("RPC: TCP recv_record got %d\n", len);
 981        return len;
 982err_delete:
 983        set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
 984        return -EAGAIN;
 985}
 986
 987static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
 988{
 989        struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
 990        struct rpc_rqst *req = NULL;
 991        struct kvec *src, *dst;
 992        __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
 993        __be32 xid;
 994        __be32 calldir;
 995
 996        xid = *p++;
 997        calldir = *p;
 998
 999        if (bc_xprt)
1000                req = xprt_lookup_rqst(bc_xprt, xid);
1001
1002        if (!req) {
1003                printk(KERN_NOTICE
1004                        "%s: Got unrecognized reply: "
1005                        "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
1006                        __func__, ntohl(calldir),
1007                        bc_xprt, xid);
1008                return -EAGAIN;
1009        }
1010
1011        memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
1012        /*
1013         * XXX!: cheating for now!  Only copying HEAD.
1014         * But we know this is good enough for now (in fact, for any
1015         * callback reply in the forseeable future).
1016         */
1017        dst = &req->rq_private_buf.head[0];
1018        src = &rqstp->rq_arg.head[0];
1019        if (dst->iov_len < src->iov_len)
1020                return -EAGAIN; /* whatever; just giving up. */
1021        memcpy(dst->iov_base, src->iov_base, src->iov_len);
1022        xprt_complete_rqst(req->rq_task, svsk->sk_reclen);
1023        rqstp->rq_arg.len = 0;
1024        return 0;
1025}
1026
1027static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1028{
1029        int i = 0;
1030        int t = 0;
1031
1032        while (t < len) {
1033                vec[i].iov_base = page_address(pages[i]);
1034                vec[i].iov_len = PAGE_SIZE;
1035                i++;
1036                t += PAGE_SIZE;
1037        }
1038        return i;
1039}
1040
1041
1042/*
1043 * Receive data from a TCP socket.
1044 */
1045static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1046{
1047        struct svc_sock *svsk =
1048                container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1049        struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1050        int             len;
1051        struct kvec *vec;
1052        unsigned int want, base;
1053        __be32 *p;
1054        __be32 calldir;
1055        int pnum;
1056
1057        dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1058                svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1059                test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1060                test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1061
1062        len = svc_tcp_recv_record(svsk, rqstp);
1063        if (len < 0)
1064                goto error;
1065
1066        base = svc_tcp_restore_pages(svsk, rqstp);
1067        want = svsk->sk_reclen - base;
1068
1069        vec = rqstp->rq_vec;
1070
1071        pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
1072                                                svsk->sk_reclen);
1073
1074        rqstp->rq_respages = &rqstp->rq_pages[pnum];
1075
1076        /* Now receive data */
1077        len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
1078        if (len >= 0)
1079                svsk->sk_tcplen += len;
1080        if (len != want) {
1081                svc_tcp_save_pages(svsk, rqstp);
1082                if (len < 0 && len != -EAGAIN)
1083                        goto err_other;
1084                dprintk("svc: incomplete TCP record (%d of %d)\n",
1085                        svsk->sk_tcplen, svsk->sk_reclen);
1086                goto err_noclose;
1087        }
1088
1089        rqstp->rq_arg.len = svsk->sk_reclen;
1090        rqstp->rq_arg.page_base = 0;
1091        if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1092                rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1093                rqstp->rq_arg.page_len = 0;
1094        } else
1095                rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1096
1097        rqstp->rq_xprt_ctxt   = NULL;
1098        rqstp->rq_prot        = IPPROTO_TCP;
1099
1100        p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1101        calldir = p[1];
1102        if (calldir)
1103                len = receive_cb_reply(svsk, rqstp);
1104
1105        /* Reset TCP read info */
1106        svsk->sk_reclen = 0;
1107        svsk->sk_tcplen = 0;
1108        /* If we have more data, signal svc_xprt_enqueue() to try again */
1109        if (svc_recv_available(svsk) > sizeof(rpc_fraghdr))
1110                set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1111
1112        if (len < 0)
1113                goto error;
1114
1115        svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1116        if (serv->sv_stats)
1117                serv->sv_stats->nettcpcnt++;
1118
1119        dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len);
1120        return rqstp->rq_arg.len;
1121
1122error:
1123        if (len != -EAGAIN)
1124                goto err_other;
1125        dprintk("RPC: TCP recvfrom got EAGAIN\n");
1126        return 0;
1127err_other:
1128        printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1129               svsk->sk_xprt.xpt_server->sv_name, -len);
1130        set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1131err_noclose:
1132        return 0;       /* record not complete */
1133}
1134
1135/*
1136 * Send out data on TCP socket.
1137 */
1138static int svc_tcp_sendto(struct svc_rqst *rqstp)
1139{
1140        struct xdr_buf  *xbufp = &rqstp->rq_res;
1141        int sent;
1142        __be32 reclen;
1143
1144        /* Set up the first element of the reply kvec.
1145         * Any other kvecs that may be in use have been taken
1146         * care of by the server implementation itself.
1147         */
1148        reclen = htonl(0x80000000|((xbufp->len ) - 4));
1149        memcpy(xbufp->head[0].iov_base, &reclen, 4);
1150
1151        sent = svc_sendto(rqstp, &rqstp->rq_res);
1152        if (sent != xbufp->len) {
1153                printk(KERN_NOTICE
1154                       "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1155                       "- shutting down socket\n",
1156                       rqstp->rq_xprt->xpt_server->sv_name,
1157                       (sent<0)?"got error":"sent only",
1158                       sent, xbufp->len);
1159                set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1160                svc_xprt_enqueue(rqstp->rq_xprt);
1161                sent = -EAGAIN;
1162        }
1163        return sent;
1164}
1165
1166/*
1167 * Setup response header. TCP has a 4B record length field.
1168 */
1169static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1170{
1171        struct kvec *resv = &rqstp->rq_res.head[0];
1172
1173        /* tcp needs a space for the record length... */
1174        svc_putnl(resv, 0);
1175}
1176
1177static int svc_tcp_has_wspace(struct svc_xprt *xprt)
1178{
1179        struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1180        struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1181        int required;
1182
1183        if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
1184                return 1;
1185        required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
1186        if (sk_stream_wspace(svsk->sk_sk) >= required)
1187                return 1;
1188        set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
1189        return 0;
1190}
1191
1192static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1193                                       struct net *net,
1194                                       struct sockaddr *sa, int salen,
1195                                       int flags)
1196{
1197        return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1198}
1199
1200#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1201static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
1202                                             struct net *, struct sockaddr *,
1203                                             int, int);
1204static void svc_bc_sock_free(struct svc_xprt *xprt);
1205
1206static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
1207                                       struct net *net,
1208                                       struct sockaddr *sa, int salen,
1209                                       int flags)
1210{
1211        return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1212}
1213
1214static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
1215{
1216}
1217
1218static struct svc_xprt_ops svc_tcp_bc_ops = {
1219        .xpo_create = svc_bc_tcp_create,
1220        .xpo_detach = svc_bc_tcp_sock_detach,
1221        .xpo_free = svc_bc_sock_free,
1222        .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1223};
1224
1225static struct svc_xprt_class svc_tcp_bc_class = {
1226        .xcl_name = "tcp-bc",
1227        .xcl_owner = THIS_MODULE,
1228        .xcl_ops = &svc_tcp_bc_ops,
1229        .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1230};
1231
1232static void svc_init_bc_xprt_sock(void)
1233{
1234        svc_reg_xprt_class(&svc_tcp_bc_class);
1235}
1236
1237static void svc_cleanup_bc_xprt_sock(void)
1238{
1239        svc_unreg_xprt_class(&svc_tcp_bc_class);
1240}
1241#else /* CONFIG_SUNRPC_BACKCHANNEL */
1242static void svc_init_bc_xprt_sock(void)
1243{
1244}
1245
1246static void svc_cleanup_bc_xprt_sock(void)
1247{
1248}
1249#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1250
1251static struct svc_xprt_ops svc_tcp_ops = {
1252        .xpo_create = svc_tcp_create,
1253        .xpo_recvfrom = svc_tcp_recvfrom,
1254        .xpo_sendto = svc_tcp_sendto,
1255        .xpo_release_rqst = svc_release_skb,
1256        .xpo_detach = svc_tcp_sock_detach,
1257        .xpo_free = svc_sock_free,
1258        .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1259        .xpo_has_wspace = svc_tcp_has_wspace,
1260        .xpo_accept = svc_tcp_accept,
1261};
1262
1263static struct svc_xprt_class svc_tcp_class = {
1264        .xcl_name = "tcp",
1265        .xcl_owner = THIS_MODULE,
1266        .xcl_ops = &svc_tcp_ops,
1267        .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1268};
1269
1270void svc_init_xprt_sock(void)
1271{
1272        svc_reg_xprt_class(&svc_tcp_class);
1273        svc_reg_xprt_class(&svc_udp_class);
1274        svc_init_bc_xprt_sock();
1275}
1276
1277void svc_cleanup_xprt_sock(void)
1278{
1279        svc_unreg_xprt_class(&svc_tcp_class);
1280        svc_unreg_xprt_class(&svc_udp_class);
1281        svc_cleanup_bc_xprt_sock();
1282}
1283
1284static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1285{
1286        struct sock     *sk = svsk->sk_sk;
1287
1288        svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1289                      &svsk->sk_xprt, serv);
1290        set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1291        if (sk->sk_state == TCP_LISTEN) {
1292                dprintk("setting up TCP socket for listening\n");
1293                set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1294                sk->sk_data_ready = svc_tcp_listen_data_ready;
1295                set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1296        } else {
1297                dprintk("setting up TCP socket for reading\n");
1298                sk->sk_state_change = svc_tcp_state_change;
1299                sk->sk_data_ready = svc_tcp_data_ready;
1300                sk->sk_write_space = svc_tcp_write_space;
1301
1302                svsk->sk_reclen = 0;
1303                svsk->sk_tcplen = 0;
1304                memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1305
1306                tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1307
1308                set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1309                if (sk->sk_state != TCP_ESTABLISHED)
1310                        set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1311        }
1312}
1313
1314void svc_sock_update_bufs(struct svc_serv *serv)
1315{
1316        /*
1317         * The number of server threads has changed. Update
1318         * rcvbuf and sndbuf accordingly on all sockets
1319         */
1320        struct svc_sock *svsk;
1321
1322        spin_lock_bh(&serv->sv_lock);
1323        list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1324                set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1325        spin_unlock_bh(&serv->sv_lock);
1326}
1327EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1328
1329/*
1330 * Initialize socket for RPC use and create svc_sock struct
1331 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1332 */
1333static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1334                                                struct socket *sock,
1335                                                int flags)
1336{
1337        struct svc_sock *svsk;
1338        struct sock     *inet;
1339        int             pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1340        int             err = 0;
1341
1342        dprintk("svc: svc_setup_socket %p\n", sock);
1343        svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1344        if (!svsk)
1345                return ERR_PTR(-ENOMEM);
1346
1347        inet = sock->sk;
1348
1349        /* Register socket with portmapper */
1350        if (pmap_register)
1351                err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1352                                     inet->sk_protocol,
1353                                     ntohs(inet_sk(inet)->inet_sport));
1354
1355        if (err < 0) {
1356                kfree(svsk);
1357                return ERR_PTR(err);
1358        }
1359
1360        inet->sk_user_data = svsk;
1361        svsk->sk_sock = sock;
1362        svsk->sk_sk = inet;
1363        svsk->sk_ostate = inet->sk_state_change;
1364        svsk->sk_odata = inet->sk_data_ready;
1365        svsk->sk_owspace = inet->sk_write_space;
1366
1367        /* Initialize the socket */
1368        if (sock->type == SOCK_DGRAM)
1369                svc_udp_init(svsk, serv);
1370        else {
1371                /* initialise setting must have enough space to
1372                 * receive and respond to one request.
1373                 */
1374                svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg,
1375                                        4 * serv->sv_max_mesg);
1376                svc_tcp_init(svsk, serv);
1377        }
1378
1379        dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1380                                svsk, svsk->sk_sk);
1381
1382        return svsk;
1383}
1384
1385/**
1386 * svc_addsock - add a listener socket to an RPC service
1387 * @serv: pointer to RPC service to which to add a new listener
1388 * @fd: file descriptor of the new listener
1389 * @name_return: pointer to buffer to fill in with name of listener
1390 * @len: size of the buffer
1391 *
1392 * Fills in socket name and returns positive length of name if successful.
1393 * Name is terminated with '\n'.  On error, returns a negative errno
1394 * value.
1395 */
1396int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1397                const size_t len)
1398{
1399        int err = 0;
1400        struct socket *so = sockfd_lookup(fd, &err);
1401        struct svc_sock *svsk = NULL;
1402        struct sockaddr_storage addr;
1403        struct sockaddr *sin = (struct sockaddr *)&addr;
1404        int salen;
1405
1406        if (!so)
1407                return err;
1408        err = -EAFNOSUPPORT;
1409        if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1410                goto out;
1411        err =  -EPROTONOSUPPORT;
1412        if (so->sk->sk_protocol != IPPROTO_TCP &&
1413            so->sk->sk_protocol != IPPROTO_UDP)
1414                goto out;
1415        err = -EISCONN;
1416        if (so->state > SS_UNCONNECTED)
1417                goto out;
1418        err = -ENOENT;
1419        if (!try_module_get(THIS_MODULE))
1420                goto out;
1421        svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
1422        if (IS_ERR(svsk)) {
1423                module_put(THIS_MODULE);
1424                err = PTR_ERR(svsk);
1425                goto out;
1426        }
1427        if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1428                svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1429        svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
1430        return svc_one_sock_name(svsk, name_return, len);
1431out:
1432        sockfd_put(so);
1433        return err;
1434}
1435EXPORT_SYMBOL_GPL(svc_addsock);
1436
1437/*
1438 * Create socket for RPC service.
1439 */
1440static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1441                                          int protocol,
1442                                          struct net *net,
1443                                          struct sockaddr *sin, int len,
1444                                          int flags)
1445{
1446        struct svc_sock *svsk;
1447        struct socket   *sock;
1448        int             error;
1449        int             type;
1450        struct sockaddr_storage addr;
1451        struct sockaddr *newsin = (struct sockaddr *)&addr;
1452        int             newlen;
1453        int             family;
1454        int             val;
1455        RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1456
1457        dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1458                        serv->sv_program->pg_name, protocol,
1459                        __svc_print_addr(sin, buf, sizeof(buf)));
1460
1461        if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1462                printk(KERN_WARNING "svc: only UDP and TCP "
1463                                "sockets supported\n");
1464                return ERR_PTR(-EINVAL);
1465        }
1466
1467        type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1468        switch (sin->sa_family) {
1469        case AF_INET6:
1470                family = PF_INET6;
1471                break;
1472        case AF_INET:
1473                family = PF_INET;
1474                break;
1475        default:
1476                return ERR_PTR(-EINVAL);
1477        }
1478
1479        error = __sock_create(net, family, type, protocol, &sock, 1);
1480        if (error < 0)
1481                return ERR_PTR(error);
1482
1483        svc_reclassify_socket(sock);
1484
1485        /*
1486         * If this is an PF_INET6 listener, we want to avoid
1487         * getting requests from IPv4 remotes.  Those should
1488         * be shunted to a PF_INET listener via rpcbind.
1489         */
1490        val = 1;
1491        if (family == PF_INET6)
1492                kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1493                                        (char *)&val, sizeof(val));
1494
1495        if (type == SOCK_STREAM)
1496                sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1497        error = kernel_bind(sock, sin, len);
1498        if (error < 0)
1499                goto bummer;
1500
1501        newlen = len;
1502        error = kernel_getsockname(sock, newsin, &newlen);
1503        if (error < 0)
1504                goto bummer;
1505
1506        if (protocol == IPPROTO_TCP) {
1507                if ((error = kernel_listen(sock, 64)) < 0)
1508                        goto bummer;
1509        }
1510
1511        svsk = svc_setup_socket(serv, sock, flags);
1512        if (IS_ERR(svsk)) {
1513                error = PTR_ERR(svsk);
1514                goto bummer;
1515        }
1516        svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1517        return (struct svc_xprt *)svsk;
1518bummer:
1519        dprintk("svc: svc_create_socket error = %d\n", -error);
1520        sock_release(sock);
1521        return ERR_PTR(error);
1522}
1523
1524/*
1525 * Detach the svc_sock from the socket so that no
1526 * more callbacks occur.
1527 */
1528static void svc_sock_detach(struct svc_xprt *xprt)
1529{
1530        struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1531        struct sock *sk = svsk->sk_sk;
1532        wait_queue_head_t *wq;
1533
1534        dprintk("svc: svc_sock_detach(%p)\n", svsk);
1535
1536        /* put back the old socket callbacks */
1537        sk->sk_state_change = svsk->sk_ostate;
1538        sk->sk_data_ready = svsk->sk_odata;
1539        sk->sk_write_space = svsk->sk_owspace;
1540
1541        wq = sk_sleep(sk);
1542        if (wq && waitqueue_active(wq))
1543                wake_up_interruptible(wq);
1544}
1545
1546/*
1547 * Disconnect the socket, and reset the callbacks
1548 */
1549static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1550{
1551        struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1552
1553        dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1554
1555        svc_sock_detach(xprt);
1556
1557        if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1558                svc_tcp_clear_pages(svsk);
1559                kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1560        }
1561}
1562
1563/*
1564 * Free the svc_sock's socket resources and the svc_sock itself.
1565 */
1566static void svc_sock_free(struct svc_xprt *xprt)
1567{
1568        struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1569        dprintk("svc: svc_sock_free(%p)\n", svsk);
1570
1571        if (svsk->sk_sock->file)
1572                sockfd_put(svsk->sk_sock);
1573        else
1574                sock_release(svsk->sk_sock);
1575        kfree(svsk);
1576}
1577
1578#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1579/*
1580 * Create a back channel svc_xprt which shares the fore channel socket.
1581 */
1582static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
1583                                             int protocol,
1584                                             struct net *net,
1585                                             struct sockaddr *sin, int len,
1586                                             int flags)
1587{
1588        struct svc_sock *svsk;
1589        struct svc_xprt *xprt;
1590
1591        if (protocol != IPPROTO_TCP) {
1592                printk(KERN_WARNING "svc: only TCP sockets"
1593                        " supported on shared back channel\n");
1594                return ERR_PTR(-EINVAL);
1595        }
1596
1597        svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1598        if (!svsk)
1599                return ERR_PTR(-ENOMEM);
1600
1601        xprt = &svsk->sk_xprt;
1602        svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
1603
1604        serv->sv_bc_xprt = xprt;
1605
1606        return xprt;
1607}
1608
1609/*
1610 * Free a back channel svc_sock.
1611 */
1612static void svc_bc_sock_free(struct svc_xprt *xprt)
1613{
1614        if (xprt)
1615                kfree(container_of(xprt, struct svc_sock, sk_xprt));
1616}
1617#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1618
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