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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * linux/net/sunrpc/svcsock.c
- *
- * These are the RPC server socket internals.
- *
- * The server scheduling algorithm does not always distribute the load
- * evenly when servicing a single client. May need to modify the
- * svc_xprt_enqueue procedure...
- *
- * TCP support is largely untested and may be a little slow. The problem
- * is that we currently do two separate recvfrom's, one for the 4-byte
- * record length, and the second for the actual record. This could possibly
- * be improved by always reading a minimum size of around 100 bytes and
- * tucking any superfluous bytes away in a temporary store. Still, that
- * leaves write requests out in the rain. An alternative may be to peek at
- * the first skb in the queue, and if it matches the next TCP sequence
- * number, to extract the record marker. Yuck.
- *
- * Copyright (C) 1995, 1996 Olaf Kirch <[email protected]>
- */
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/module.h>
- #include <linux/errno.h>
- #include <linux/fcntl.h>
- #include <linux/net.h>
- #include <linux/in.h>
- #include <linux/inet.h>
- #include <linux/udp.h>
- #include <linux/tcp.h>
- #include <linux/unistd.h>
- #include <linux/slab.h>
- #include <linux/netdevice.h>
- #include <linux/skbuff.h>
- #include <linux/file.h>
- #include <linux/freezer.h>
- #include <net/sock.h>
- #include <net/checksum.h>
- #include <net/ip.h>
- #include <net/ipv6.h>
- #include <net/udp.h>
- #include <net/tcp.h>
- #include <net/tcp_states.h>
- #include <linux/uaccess.h>
- #include <linux/highmem.h>
- #include <asm/ioctls.h>
- #include <linux/sunrpc/types.h>
- #include <linux/sunrpc/clnt.h>
- #include <linux/sunrpc/xdr.h>
- #include <linux/sunrpc/msg_prot.h>
- #include <linux/sunrpc/svcsock.h>
- #include <linux/sunrpc/stats.h>
- #include <linux/sunrpc/xprt.h>
- #include <trace/events/sunrpc.h>
- #include "socklib.h"
- #include "sunrpc.h"
- #define RPCDBG_FACILITY RPCDBG_SVCXPRT
- static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
- int flags);
- static int svc_udp_recvfrom(struct svc_rqst *);
- static int svc_udp_sendto(struct svc_rqst *);
- static void svc_sock_detach(struct svc_xprt *);
- static void svc_tcp_sock_detach(struct svc_xprt *);
- static void svc_sock_free(struct svc_xprt *);
- static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
- struct net *, struct sockaddr *,
- int, int);
- #ifdef CONFIG_DEBUG_LOCK_ALLOC
- static struct lock_class_key svc_key[2];
- static struct lock_class_key svc_slock_key[2];
- static void svc_reclassify_socket(struct socket *sock)
- {
- struct sock *sk = sock->sk;
- if (WARN_ON_ONCE(!sock_allow_reclassification(sk)))
- return;
- switch (sk->sk_family) {
- case AF_INET:
- sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
- &svc_slock_key[0],
- "sk_xprt.xpt_lock-AF_INET-NFSD",
- &svc_key[0]);
- break;
- case AF_INET6:
- sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
- &svc_slock_key[1],
- "sk_xprt.xpt_lock-AF_INET6-NFSD",
- &svc_key[1]);
- break;
- default:
- BUG();
- }
- }
- #else
- static void svc_reclassify_socket(struct socket *sock)
- {
- }
- #endif
- /**
- * svc_tcp_release_ctxt - Release transport-related resources
- * @xprt: the transport which owned the context
- * @ctxt: the context from rqstp->rq_xprt_ctxt or dr->xprt_ctxt
- *
- */
- static void svc_tcp_release_ctxt(struct svc_xprt *xprt, void *ctxt)
- {
- }
- /**
- * svc_udp_release_ctxt - Release transport-related resources
- * @xprt: the transport which owned the context
- * @ctxt: the context from rqstp->rq_xprt_ctxt or dr->xprt_ctxt
- *
- */
- static void svc_udp_release_ctxt(struct svc_xprt *xprt, void *ctxt)
- {
- struct sk_buff *skb = ctxt;
- if (skb)
- consume_skb(skb);
- }
- union svc_pktinfo_u {
- struct in_pktinfo pkti;
- struct in6_pktinfo pkti6;
- };
- #define SVC_PKTINFO_SPACE \
- CMSG_SPACE(sizeof(union svc_pktinfo_u))
- static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
- {
- struct svc_sock *svsk =
- container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
- switch (svsk->sk_sk->sk_family) {
- case AF_INET: {
- struct in_pktinfo *pki = CMSG_DATA(cmh);
- cmh->cmsg_level = SOL_IP;
- cmh->cmsg_type = IP_PKTINFO;
- pki->ipi_ifindex = 0;
- pki->ipi_spec_dst.s_addr =
- svc_daddr_in(rqstp)->sin_addr.s_addr;
- cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
- }
- break;
- case AF_INET6: {
- struct in6_pktinfo *pki = CMSG_DATA(cmh);
- struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
- cmh->cmsg_level = SOL_IPV6;
- cmh->cmsg_type = IPV6_PKTINFO;
- pki->ipi6_ifindex = daddr->sin6_scope_id;
- pki->ipi6_addr = daddr->sin6_addr;
- cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
- }
- break;
- }
- }
- static int svc_sock_result_payload(struct svc_rqst *rqstp, unsigned int offset,
- unsigned int length)
- {
- return 0;
- }
- /*
- * Report socket names for nfsdfs
- */
- static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
- {
- const struct sock *sk = svsk->sk_sk;
- const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
- "udp" : "tcp";
- int len;
- switch (sk->sk_family) {
- case PF_INET:
- len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
- proto_name,
- &inet_sk(sk)->inet_rcv_saddr,
- inet_sk(sk)->inet_num);
- break;
- #if IS_ENABLED(CONFIG_IPV6)
- case PF_INET6:
- len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
- proto_name,
- &sk->sk_v6_rcv_saddr,
- inet_sk(sk)->inet_num);
- break;
- #endif
- default:
- len = snprintf(buf, remaining, "*unknown-%d*\n",
- sk->sk_family);
- }
- if (len >= remaining) {
- *buf = '\0';
- return -ENAMETOOLONG;
- }
- return len;
- }
- #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
- static void svc_flush_bvec(const struct bio_vec *bvec, size_t size, size_t seek)
- {
- struct bvec_iter bi = {
- .bi_size = size + seek,
- };
- struct bio_vec bv;
- bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
- for_each_bvec(bv, bvec, bi, bi)
- flush_dcache_page(bv.bv_page);
- }
- #else
- static inline void svc_flush_bvec(const struct bio_vec *bvec, size_t size,
- size_t seek)
- {
- }
- #endif
- /*
- * Read from @rqstp's transport socket. The incoming message fills whole
- * pages in @rqstp's rq_pages array until the last page of the message
- * has been received into a partial page.
- */
- static ssize_t svc_tcp_read_msg(struct svc_rqst *rqstp, size_t buflen,
- size_t seek)
- {
- struct svc_sock *svsk =
- container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
- struct bio_vec *bvec = rqstp->rq_bvec;
- struct msghdr msg = { NULL };
- unsigned int i;
- ssize_t len;
- size_t t;
- clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
- for (i = 0, t = 0; t < buflen; i++, t += PAGE_SIZE) {
- bvec[i].bv_page = rqstp->rq_pages[i];
- bvec[i].bv_len = PAGE_SIZE;
- bvec[i].bv_offset = 0;
- }
- rqstp->rq_respages = &rqstp->rq_pages[i];
- rqstp->rq_next_page = rqstp->rq_respages + 1;
- iov_iter_bvec(&msg.msg_iter, ITER_DEST, bvec, i, buflen);
- if (seek) {
- iov_iter_advance(&msg.msg_iter, seek);
- buflen -= seek;
- }
- len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT);
- if (len > 0)
- svc_flush_bvec(bvec, len, seek);
- /* If we read a full record, then assume there may be more
- * data to read (stream based sockets only!)
- */
- if (len == buflen)
- set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
- return len;
- }
- /*
- * Set socket snd and rcv buffer lengths
- */
- static void svc_sock_setbufsize(struct svc_sock *svsk, unsigned int nreqs)
- {
- unsigned int max_mesg = svsk->sk_xprt.xpt_server->sv_max_mesg;
- struct socket *sock = svsk->sk_sock;
- nreqs = min(nreqs, INT_MAX / 2 / max_mesg);
- lock_sock(sock->sk);
- sock->sk->sk_sndbuf = nreqs * max_mesg * 2;
- sock->sk->sk_rcvbuf = nreqs * max_mesg * 2;
- sock->sk->sk_write_space(sock->sk);
- release_sock(sock->sk);
- }
- static void svc_sock_secure_port(struct svc_rqst *rqstp)
- {
- if (svc_port_is_privileged(svc_addr(rqstp)))
- set_bit(RQ_SECURE, &rqstp->rq_flags);
- else
- clear_bit(RQ_SECURE, &rqstp->rq_flags);
- }
- /*
- * INET callback when data has been received on the socket.
- */
- static void svc_data_ready(struct sock *sk)
- {
- struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
- if (svsk) {
- /* Refer to svc_setup_socket() for details. */
- rmb();
- svsk->sk_odata(sk);
- trace_svcsock_data_ready(&svsk->sk_xprt, 0);
- if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags))
- svc_xprt_enqueue(&svsk->sk_xprt);
- }
- }
- /*
- * INET callback when space is newly available on the socket.
- */
- static void svc_write_space(struct sock *sk)
- {
- struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
- if (svsk) {
- /* Refer to svc_setup_socket() for details. */
- rmb();
- trace_svcsock_write_space(&svsk->sk_xprt, 0);
- svsk->sk_owspace(sk);
- svc_xprt_enqueue(&svsk->sk_xprt);
- }
- }
- static int svc_tcp_has_wspace(struct svc_xprt *xprt)
- {
- struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
- if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
- return 1;
- return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
- }
- static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt)
- {
- struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
- sock_no_linger(svsk->sk_sock->sk);
- }
- /*
- * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
- */
- static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
- struct cmsghdr *cmh)
- {
- struct in_pktinfo *pki = CMSG_DATA(cmh);
- struct sockaddr_in *daddr = svc_daddr_in(rqstp);
- if (cmh->cmsg_type != IP_PKTINFO)
- return 0;
- daddr->sin_family = AF_INET;
- daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
- return 1;
- }
- /*
- * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
- */
- static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
- struct cmsghdr *cmh)
- {
- struct in6_pktinfo *pki = CMSG_DATA(cmh);
- struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
- if (cmh->cmsg_type != IPV6_PKTINFO)
- return 0;
- daddr->sin6_family = AF_INET6;
- daddr->sin6_addr = pki->ipi6_addr;
- daddr->sin6_scope_id = pki->ipi6_ifindex;
- return 1;
- }
- /*
- * Copy the UDP datagram's destination address to the rqstp structure.
- * The 'destination' address in this case is the address to which the
- * peer sent the datagram, i.e. our local address. For multihomed
- * hosts, this can change from msg to msg. Note that only the IP
- * address changes, the port number should remain the same.
- */
- static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
- struct cmsghdr *cmh)
- {
- switch (cmh->cmsg_level) {
- case SOL_IP:
- return svc_udp_get_dest_address4(rqstp, cmh);
- case SOL_IPV6:
- return svc_udp_get_dest_address6(rqstp, cmh);
- }
- return 0;
- }
- /**
- * svc_udp_recvfrom - Receive a datagram from a UDP socket.
- * @rqstp: request structure into which to receive an RPC Call
- *
- * Called in a loop when XPT_DATA has been set.
- *
- * Returns:
- * On success, the number of bytes in a received RPC Call, or
- * %0 if a complete RPC Call message was not ready to return
- */
- static int svc_udp_recvfrom(struct svc_rqst *rqstp)
- {
- struct svc_sock *svsk =
- container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
- struct svc_serv *serv = svsk->sk_xprt.xpt_server;
- struct sk_buff *skb;
- union {
- struct cmsghdr hdr;
- long all[SVC_PKTINFO_SPACE / sizeof(long)];
- } buffer;
- struct cmsghdr *cmh = &buffer.hdr;
- struct msghdr msg = {
- .msg_name = svc_addr(rqstp),
- .msg_control = cmh,
- .msg_controllen = sizeof(buffer),
- .msg_flags = MSG_DONTWAIT,
- };
- size_t len;
- int err;
- if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
- /* udp sockets need large rcvbuf as all pending
- * requests are still in that buffer. sndbuf must
- * also be large enough that there is enough space
- * for one reply per thread. We count all threads
- * rather than threads in a particular pool, which
- * provides an upper bound on the number of threads
- * which will access the socket.
- */
- svc_sock_setbufsize(svsk, serv->sv_nrthreads + 3);
- clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
- err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
- 0, 0, MSG_PEEK | MSG_DONTWAIT);
- if (err < 0)
- goto out_recv_err;
- skb = skb_recv_udp(svsk->sk_sk, MSG_DONTWAIT, &err);
- if (!skb)
- goto out_recv_err;
- len = svc_addr_len(svc_addr(rqstp));
- rqstp->rq_addrlen = len;
- if (skb->tstamp == 0) {
- skb->tstamp = ktime_get_real();
- /* Don't enable netstamp, sunrpc doesn't
- need that much accuracy */
- }
- sock_write_timestamp(svsk->sk_sk, skb->tstamp);
- set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
- len = skb->len;
- rqstp->rq_arg.len = len;
- trace_svcsock_udp_recv(&svsk->sk_xprt, len);
- rqstp->rq_prot = IPPROTO_UDP;
- if (!svc_udp_get_dest_address(rqstp, cmh))
- goto out_cmsg_err;
- rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
- if (skb_is_nonlinear(skb)) {
- /* we have to copy */
- local_bh_disable();
- if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb))
- goto out_bh_enable;
- local_bh_enable();
- consume_skb(skb);
- } else {
- /* we can use it in-place */
- rqstp->rq_arg.head[0].iov_base = skb->data;
- rqstp->rq_arg.head[0].iov_len = len;
- if (skb_checksum_complete(skb))
- goto out_free;
- rqstp->rq_xprt_ctxt = skb;
- }
- rqstp->rq_arg.page_base = 0;
- if (len <= rqstp->rq_arg.head[0].iov_len) {
- rqstp->rq_arg.head[0].iov_len = len;
- rqstp->rq_arg.page_len = 0;
- rqstp->rq_respages = rqstp->rq_pages+1;
- } else {
- rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
- rqstp->rq_respages = rqstp->rq_pages + 1 +
- DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
- }
- rqstp->rq_next_page = rqstp->rq_respages+1;
- if (serv->sv_stats)
- serv->sv_stats->netudpcnt++;
- svc_xprt_received(rqstp->rq_xprt);
- return len;
- out_recv_err:
- if (err != -EAGAIN) {
- /* possibly an icmp error */
- set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
- }
- trace_svcsock_udp_recv_err(&svsk->sk_xprt, err);
- goto out_clear_busy;
- out_cmsg_err:
- net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
- cmh->cmsg_level, cmh->cmsg_type);
- goto out_free;
- out_bh_enable:
- local_bh_enable();
- out_free:
- kfree_skb(skb);
- out_clear_busy:
- svc_xprt_received(rqstp->rq_xprt);
- return 0;
- }
- /**
- * svc_udp_sendto - Send out a reply on a UDP socket
- * @rqstp: completed svc_rqst
- *
- * xpt_mutex ensures @rqstp's whole message is written to the socket
- * without interruption.
- *
- * Returns the number of bytes sent, or a negative errno.
- */
- static int svc_udp_sendto(struct svc_rqst *rqstp)
- {
- struct svc_xprt *xprt = rqstp->rq_xprt;
- struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
- struct xdr_buf *xdr = &rqstp->rq_res;
- union {
- struct cmsghdr hdr;
- long all[SVC_PKTINFO_SPACE / sizeof(long)];
- } buffer;
- struct cmsghdr *cmh = &buffer.hdr;
- struct msghdr msg = {
- .msg_name = &rqstp->rq_addr,
- .msg_namelen = rqstp->rq_addrlen,
- .msg_control = cmh,
- .msg_controllen = sizeof(buffer),
- };
- unsigned int sent;
- int err;
- svc_udp_release_ctxt(xprt, rqstp->rq_xprt_ctxt);
- rqstp->rq_xprt_ctxt = NULL;
- svc_set_cmsg_data(rqstp, cmh);
- mutex_lock(&xprt->xpt_mutex);
- if (svc_xprt_is_dead(xprt))
- goto out_notconn;
- err = xdr_alloc_bvec(xdr, GFP_KERNEL);
- if (err < 0)
- goto out_unlock;
- err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent);
- if (err == -ECONNREFUSED) {
- /* ICMP error on earlier request. */
- err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent);
- }
- xdr_free_bvec(xdr);
- trace_svcsock_udp_send(xprt, err);
- out_unlock:
- mutex_unlock(&xprt->xpt_mutex);
- if (err < 0)
- return err;
- return sent;
- out_notconn:
- mutex_unlock(&xprt->xpt_mutex);
- return -ENOTCONN;
- }
- static int svc_udp_has_wspace(struct svc_xprt *xprt)
- {
- struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
- struct svc_serv *serv = xprt->xpt_server;
- unsigned long required;
- /*
- * Set the SOCK_NOSPACE flag before checking the available
- * sock space.
- */
- set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
- required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
- if (required*2 > sock_wspace(svsk->sk_sk))
- return 0;
- clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
- return 1;
- }
- static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
- {
- BUG();
- return NULL;
- }
- static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt)
- {
- }
- static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
- struct net *net,
- struct sockaddr *sa, int salen,
- int flags)
- {
- return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
- }
- static const struct svc_xprt_ops svc_udp_ops = {
- .xpo_create = svc_udp_create,
- .xpo_recvfrom = svc_udp_recvfrom,
- .xpo_sendto = svc_udp_sendto,
- .xpo_result_payload = svc_sock_result_payload,
- .xpo_release_ctxt = svc_udp_release_ctxt,
- .xpo_detach = svc_sock_detach,
- .xpo_free = svc_sock_free,
- .xpo_has_wspace = svc_udp_has_wspace,
- .xpo_accept = svc_udp_accept,
- .xpo_secure_port = svc_sock_secure_port,
- .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt,
- };
- static struct svc_xprt_class svc_udp_class = {
- .xcl_name = "udp",
- .xcl_owner = THIS_MODULE,
- .xcl_ops = &svc_udp_ops,
- .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
- .xcl_ident = XPRT_TRANSPORT_UDP,
- };
- static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
- {
- svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
- &svsk->sk_xprt, serv);
- clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
- svsk->sk_sk->sk_data_ready = svc_data_ready;
- svsk->sk_sk->sk_write_space = svc_write_space;
- /* initialise setting must have enough space to
- * receive and respond to one request.
- * svc_udp_recvfrom will re-adjust if necessary
- */
- svc_sock_setbufsize(svsk, 3);
- /* data might have come in before data_ready set up */
- set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
- set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
- /* make sure we get destination address info */
- switch (svsk->sk_sk->sk_family) {
- case AF_INET:
- ip_sock_set_pktinfo(svsk->sk_sock->sk);
- break;
- case AF_INET6:
- ip6_sock_set_recvpktinfo(svsk->sk_sock->sk);
- break;
- default:
- BUG();
- }
- }
- /*
- * A data_ready event on a listening socket means there's a connection
- * pending. Do not use state_change as a substitute for it.
- */
- static void svc_tcp_listen_data_ready(struct sock *sk)
- {
- struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
- /*
- * This callback may called twice when a new connection
- * is established as a child socket inherits everything
- * from a parent LISTEN socket.
- * 1) data_ready method of the parent socket will be called
- * when one of child sockets become ESTABLISHED.
- * 2) data_ready method of the child socket may be called
- * when it receives data before the socket is accepted.
- * In case of 2, we should ignore it silently and DO NOT
- * dereference svsk.
- */
- if (sk->sk_state != TCP_LISTEN)
- return;
- if (svsk) {
- /* Refer to svc_setup_socket() for details. */
- rmb();
- svsk->sk_odata(sk);
- set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
- svc_xprt_enqueue(&svsk->sk_xprt);
- }
- }
- /*
- * A state change on a connected socket means it's dying or dead.
- */
- static void svc_tcp_state_change(struct sock *sk)
- {
- struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
- if (svsk) {
- /* Refer to svc_setup_socket() for details. */
- rmb();
- svsk->sk_ostate(sk);
- trace_svcsock_tcp_state(&svsk->sk_xprt, svsk->sk_sock);
- if (sk->sk_state != TCP_ESTABLISHED)
- svc_xprt_deferred_close(&svsk->sk_xprt);
- }
- }
- /*
- * Accept a TCP connection
- */
- static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
- {
- struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
- struct sockaddr_storage addr;
- struct sockaddr *sin = (struct sockaddr *) &addr;
- struct svc_serv *serv = svsk->sk_xprt.xpt_server;
- struct socket *sock = svsk->sk_sock;
- struct socket *newsock;
- struct svc_sock *newsvsk;
- int err, slen;
- if (!sock)
- return NULL;
- clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
- err = kernel_accept(sock, &newsock, O_NONBLOCK);
- if (err < 0) {
- if (err == -ENOMEM)
- printk(KERN_WARNING "%s: no more sockets!\n",
- serv->sv_name);
- else if (err != -EAGAIN)
- net_warn_ratelimited("%s: accept failed (err %d)!\n",
- serv->sv_name, -err);
- trace_svcsock_accept_err(xprt, serv->sv_name, err);
- return NULL;
- }
- set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
- err = kernel_getpeername(newsock, sin);
- if (err < 0) {
- trace_svcsock_getpeername_err(xprt, serv->sv_name, err);
- goto failed; /* aborted connection or whatever */
- }
- slen = err;
- /* Reset the inherited callbacks before calling svc_setup_socket */
- newsock->sk->sk_state_change = svsk->sk_ostate;
- newsock->sk->sk_data_ready = svsk->sk_odata;
- newsock->sk->sk_write_space = svsk->sk_owspace;
- /* make sure that a write doesn't block forever when
- * low on memory
- */
- newsock->sk->sk_sndtimeo = HZ*30;
- newsvsk = svc_setup_socket(serv, newsock,
- (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
- if (IS_ERR(newsvsk))
- goto failed;
- svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
- err = kernel_getsockname(newsock, sin);
- slen = err;
- if (unlikely(err < 0))
- slen = offsetof(struct sockaddr, sa_data);
- svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
- if (sock_is_loopback(newsock->sk))
- set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
- else
- clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
- if (serv->sv_stats)
- serv->sv_stats->nettcpconn++;
- return &newsvsk->sk_xprt;
- failed:
- sock_release(newsock);
- return NULL;
- }
- static size_t svc_tcp_restore_pages(struct svc_sock *svsk,
- struct svc_rqst *rqstp)
- {
- size_t len = svsk->sk_datalen;
- unsigned int i, npages;
- if (!len)
- return 0;
- npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
- for (i = 0; i < npages; i++) {
- if (rqstp->rq_pages[i] != NULL)
- put_page(rqstp->rq_pages[i]);
- BUG_ON(svsk->sk_pages[i] == NULL);
- rqstp->rq_pages[i] = svsk->sk_pages[i];
- svsk->sk_pages[i] = NULL;
- }
- rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
- return len;
- }
- static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
- {
- unsigned int i, len, npages;
- if (svsk->sk_datalen == 0)
- return;
- len = svsk->sk_datalen;
- npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
- for (i = 0; i < npages; i++) {
- svsk->sk_pages[i] = rqstp->rq_pages[i];
- rqstp->rq_pages[i] = NULL;
- }
- }
- static void svc_tcp_clear_pages(struct svc_sock *svsk)
- {
- unsigned int i, len, npages;
- if (svsk->sk_datalen == 0)
- goto out;
- len = svsk->sk_datalen;
- npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
- for (i = 0; i < npages; i++) {
- if (svsk->sk_pages[i] == NULL) {
- WARN_ON_ONCE(1);
- continue;
- }
- put_page(svsk->sk_pages[i]);
- svsk->sk_pages[i] = NULL;
- }
- out:
- svsk->sk_tcplen = 0;
- svsk->sk_datalen = 0;
- }
- /*
- * Receive fragment record header into sk_marker.
- */
- static ssize_t svc_tcp_read_marker(struct svc_sock *svsk,
- struct svc_rqst *rqstp)
- {
- ssize_t want, len;
- /* If we haven't gotten the record length yet,
- * get the next four bytes.
- */
- if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
- struct msghdr msg = { NULL };
- struct kvec iov;
- want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
- iov.iov_base = ((char *)&svsk->sk_marker) + svsk->sk_tcplen;
- iov.iov_len = want;
- iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, want);
- len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT);
- if (len < 0)
- return len;
- svsk->sk_tcplen += len;
- if (len < want) {
- /* call again to read the remaining bytes */
- goto err_short;
- }
- trace_svcsock_marker(&svsk->sk_xprt, svsk->sk_marker);
- if (svc_sock_reclen(svsk) + svsk->sk_datalen >
- svsk->sk_xprt.xpt_server->sv_max_mesg)
- goto err_too_large;
- }
- return svc_sock_reclen(svsk);
- err_too_large:
- net_notice_ratelimited("svc: %s %s RPC fragment too large: %d\n",
- __func__, svsk->sk_xprt.xpt_server->sv_name,
- svc_sock_reclen(svsk));
- svc_xprt_deferred_close(&svsk->sk_xprt);
- err_short:
- return -EAGAIN;
- }
- static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
- {
- struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
- struct rpc_rqst *req = NULL;
- struct kvec *src, *dst;
- __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
- __be32 xid;
- __be32 calldir;
- xid = *p++;
- calldir = *p;
- if (!bc_xprt)
- return -EAGAIN;
- spin_lock(&bc_xprt->queue_lock);
- req = xprt_lookup_rqst(bc_xprt, xid);
- if (!req)
- goto unlock_notfound;
- memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
- /*
- * XXX!: cheating for now! Only copying HEAD.
- * But we know this is good enough for now (in fact, for any
- * callback reply in the forseeable future).
- */
- dst = &req->rq_private_buf.head[0];
- src = &rqstp->rq_arg.head[0];
- if (dst->iov_len < src->iov_len)
- goto unlock_eagain; /* whatever; just giving up. */
- memcpy(dst->iov_base, src->iov_base, src->iov_len);
- xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
- rqstp->rq_arg.len = 0;
- spin_unlock(&bc_xprt->queue_lock);
- return 0;
- unlock_notfound:
- printk(KERN_NOTICE
- "%s: Got unrecognized reply: "
- "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
- __func__, ntohl(calldir),
- bc_xprt, ntohl(xid));
- unlock_eagain:
- spin_unlock(&bc_xprt->queue_lock);
- return -EAGAIN;
- }
- static void svc_tcp_fragment_received(struct svc_sock *svsk)
- {
- /* If we have more data, signal svc_xprt_enqueue() to try again */
- svsk->sk_tcplen = 0;
- svsk->sk_marker = xdr_zero;
- }
- /**
- * svc_tcp_recvfrom - Receive data from a TCP socket
- * @rqstp: request structure into which to receive an RPC Call
- *
- * Called in a loop when XPT_DATA has been set.
- *
- * Read the 4-byte stream record marker, then use the record length
- * in that marker to set up exactly the resources needed to receive
- * the next RPC message into @rqstp.
- *
- * Returns:
- * On success, the number of bytes in a received RPC Call, or
- * %0 if a complete RPC Call message was not ready to return
- *
- * The zero return case handles partial receives and callback Replies.
- * The state of a partial receive is preserved in the svc_sock for
- * the next call to svc_tcp_recvfrom.
- */
- static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
- {
- struct svc_sock *svsk =
- container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
- struct svc_serv *serv = svsk->sk_xprt.xpt_server;
- size_t want, base;
- ssize_t len;
- __be32 *p;
- __be32 calldir;
- clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
- len = svc_tcp_read_marker(svsk, rqstp);
- if (len < 0)
- goto error;
- base = svc_tcp_restore_pages(svsk, rqstp);
- want = len - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
- len = svc_tcp_read_msg(rqstp, base + want, base);
- if (len >= 0) {
- trace_svcsock_tcp_recv(&svsk->sk_xprt, len);
- svsk->sk_tcplen += len;
- svsk->sk_datalen += len;
- }
- if (len != want || !svc_sock_final_rec(svsk))
- goto err_incomplete;
- if (svsk->sk_datalen < 8)
- goto err_nuts;
- rqstp->rq_arg.len = svsk->sk_datalen;
- rqstp->rq_arg.page_base = 0;
- if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
- rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
- rqstp->rq_arg.page_len = 0;
- } else
- rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
- rqstp->rq_xprt_ctxt = NULL;
- rqstp->rq_prot = IPPROTO_TCP;
- if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags))
- set_bit(RQ_LOCAL, &rqstp->rq_flags);
- else
- clear_bit(RQ_LOCAL, &rqstp->rq_flags);
- p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
- calldir = p[1];
- if (calldir)
- len = receive_cb_reply(svsk, rqstp);
- /* Reset TCP read info */
- svsk->sk_datalen = 0;
- svc_tcp_fragment_received(svsk);
- if (len < 0)
- goto error;
- svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
- if (serv->sv_stats)
- serv->sv_stats->nettcpcnt++;
- svc_xprt_received(rqstp->rq_xprt);
- return rqstp->rq_arg.len;
- err_incomplete:
- svc_tcp_save_pages(svsk, rqstp);
- if (len < 0 && len != -EAGAIN)
- goto err_delete;
- if (len == want)
- svc_tcp_fragment_received(svsk);
- else
- trace_svcsock_tcp_recv_short(&svsk->sk_xprt,
- svc_sock_reclen(svsk),
- svsk->sk_tcplen - sizeof(rpc_fraghdr));
- goto err_noclose;
- error:
- if (len != -EAGAIN)
- goto err_delete;
- trace_svcsock_tcp_recv_eagain(&svsk->sk_xprt, 0);
- goto err_noclose;
- err_nuts:
- svsk->sk_datalen = 0;
- err_delete:
- trace_svcsock_tcp_recv_err(&svsk->sk_xprt, len);
- svc_xprt_deferred_close(&svsk->sk_xprt);
- err_noclose:
- svc_xprt_received(rqstp->rq_xprt);
- return 0; /* record not complete */
- }
- static int svc_tcp_send_kvec(struct socket *sock, const struct kvec *vec,
- int flags)
- {
- return kernel_sendpage(sock, virt_to_page(vec->iov_base),
- offset_in_page(vec->iov_base),
- vec->iov_len, flags);
- }
- /*
- * kernel_sendpage() is used exclusively to reduce the number of
- * copy operations in this path. Therefore the caller must ensure
- * that the pages backing @xdr are unchanging.
- *
- * In addition, the logic assumes that * .bv_len is never larger
- * than PAGE_SIZE.
- */
- static int svc_tcp_sendmsg(struct socket *sock, struct xdr_buf *xdr,
- rpc_fraghdr marker, unsigned int *sentp)
- {
- const struct kvec *head = xdr->head;
- const struct kvec *tail = xdr->tail;
- struct kvec rm = {
- .iov_base = &marker,
- .iov_len = sizeof(marker),
- };
- struct msghdr msg = {
- .msg_flags = 0,
- };
- int ret;
- *sentp = 0;
- ret = xdr_alloc_bvec(xdr, GFP_KERNEL);
- if (ret < 0)
- return ret;
- ret = kernel_sendmsg(sock, &msg, &rm, 1, rm.iov_len);
- if (ret < 0)
- return ret;
- *sentp += ret;
- if (ret != rm.iov_len)
- return -EAGAIN;
- ret = svc_tcp_send_kvec(sock, head, 0);
- if (ret < 0)
- return ret;
- *sentp += ret;
- if (ret != head->iov_len)
- goto out;
- if (xdr->page_len) {
- unsigned int offset, len, remaining;
- struct bio_vec *bvec;
- bvec = xdr->bvec + (xdr->page_base >> PAGE_SHIFT);
- offset = offset_in_page(xdr->page_base);
- remaining = xdr->page_len;
- while (remaining > 0) {
- len = min(remaining, bvec->bv_len - offset);
- ret = kernel_sendpage(sock, bvec->bv_page,
- bvec->bv_offset + offset,
- len, 0);
- if (ret < 0)
- return ret;
- *sentp += ret;
- if (ret != len)
- goto out;
- remaining -= len;
- offset = 0;
- bvec++;
- }
- }
- if (tail->iov_len) {
- ret = svc_tcp_send_kvec(sock, tail, 0);
- if (ret < 0)
- return ret;
- *sentp += ret;
- }
- out:
- return 0;
- }
- /**
- * svc_tcp_sendto - Send out a reply on a TCP socket
- * @rqstp: completed svc_rqst
- *
- * xpt_mutex ensures @rqstp's whole message is written to the socket
- * without interruption.
- *
- * Returns the number of bytes sent, or a negative errno.
- */
- static int svc_tcp_sendto(struct svc_rqst *rqstp)
- {
- struct svc_xprt *xprt = rqstp->rq_xprt;
- struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
- struct xdr_buf *xdr = &rqstp->rq_res;
- rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
- (u32)xdr->len);
- unsigned int sent;
- int err;
- svc_tcp_release_ctxt(xprt, rqstp->rq_xprt_ctxt);
- rqstp->rq_xprt_ctxt = NULL;
- atomic_inc(&svsk->sk_sendqlen);
- mutex_lock(&xprt->xpt_mutex);
- if (svc_xprt_is_dead(xprt))
- goto out_notconn;
- tcp_sock_set_cork(svsk->sk_sk, true);
- err = svc_tcp_sendmsg(svsk->sk_sock, xdr, marker, &sent);
- xdr_free_bvec(xdr);
- trace_svcsock_tcp_send(xprt, err < 0 ? (long)err : sent);
- if (err < 0 || sent != (xdr->len + sizeof(marker)))
- goto out_close;
- if (atomic_dec_and_test(&svsk->sk_sendqlen))
- tcp_sock_set_cork(svsk->sk_sk, false);
- mutex_unlock(&xprt->xpt_mutex);
- return sent;
- out_notconn:
- atomic_dec(&svsk->sk_sendqlen);
- mutex_unlock(&xprt->xpt_mutex);
- return -ENOTCONN;
- out_close:
- pr_notice("rpc-srv/tcp: %s: %s %d when sending %d bytes - shutting down socket\n",
- xprt->xpt_server->sv_name,
- (err < 0) ? "got error" : "sent",
- (err < 0) ? err : sent, xdr->len);
- svc_xprt_deferred_close(xprt);
- atomic_dec(&svsk->sk_sendqlen);
- mutex_unlock(&xprt->xpt_mutex);
- return -EAGAIN;
- }
- static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
- struct net *net,
- struct sockaddr *sa, int salen,
- int flags)
- {
- return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
- }
- static const struct svc_xprt_ops svc_tcp_ops = {
- .xpo_create = svc_tcp_create,
- .xpo_recvfrom = svc_tcp_recvfrom,
- .xpo_sendto = svc_tcp_sendto,
- .xpo_result_payload = svc_sock_result_payload,
- .xpo_release_ctxt = svc_tcp_release_ctxt,
- .xpo_detach = svc_tcp_sock_detach,
- .xpo_free = svc_sock_free,
- .xpo_has_wspace = svc_tcp_has_wspace,
- .xpo_accept = svc_tcp_accept,
- .xpo_secure_port = svc_sock_secure_port,
- .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt,
- };
- static struct svc_xprt_class svc_tcp_class = {
- .xcl_name = "tcp",
- .xcl_owner = THIS_MODULE,
- .xcl_ops = &svc_tcp_ops,
- .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
- .xcl_ident = XPRT_TRANSPORT_TCP,
- };
- void svc_init_xprt_sock(void)
- {
- svc_reg_xprt_class(&svc_tcp_class);
- svc_reg_xprt_class(&svc_udp_class);
- }
- void svc_cleanup_xprt_sock(void)
- {
- svc_unreg_xprt_class(&svc_tcp_class);
- svc_unreg_xprt_class(&svc_udp_class);
- }
- static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
- {
- struct sock *sk = svsk->sk_sk;
- svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
- &svsk->sk_xprt, serv);
- set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
- set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags);
- if (sk->sk_state == TCP_LISTEN) {
- strcpy(svsk->sk_xprt.xpt_remotebuf, "listener");
- set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
- sk->sk_data_ready = svc_tcp_listen_data_ready;
- set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
- } else {
- sk->sk_state_change = svc_tcp_state_change;
- sk->sk_data_ready = svc_data_ready;
- sk->sk_write_space = svc_write_space;
- svsk->sk_marker = xdr_zero;
- svsk->sk_tcplen = 0;
- svsk->sk_datalen = 0;
- memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
- tcp_sock_set_nodelay(sk);
- set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
- switch (sk->sk_state) {
- case TCP_SYN_RECV:
- case TCP_ESTABLISHED:
- break;
- default:
- svc_xprt_deferred_close(&svsk->sk_xprt);
- }
- }
- }
- void svc_sock_update_bufs(struct svc_serv *serv)
- {
- /*
- * The number of server threads has changed. Update
- * rcvbuf and sndbuf accordingly on all sockets
- */
- struct svc_sock *svsk;
- spin_lock_bh(&serv->sv_lock);
- list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
- set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
- spin_unlock_bh(&serv->sv_lock);
- }
- EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
- /*
- * Initialize socket for RPC use and create svc_sock struct
- */
- static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
- struct socket *sock,
- int flags)
- {
- struct svc_sock *svsk;
- struct sock *inet;
- int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
- int err = 0;
- svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
- if (!svsk)
- return ERR_PTR(-ENOMEM);
- inet = sock->sk;
- /* Register socket with portmapper */
- if (pmap_register)
- err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
- inet->sk_protocol,
- ntohs(inet_sk(inet)->inet_sport));
- if (err < 0) {
- kfree(svsk);
- return ERR_PTR(err);
- }
- svsk->sk_sock = sock;
- svsk->sk_sk = inet;
- svsk->sk_ostate = inet->sk_state_change;
- svsk->sk_odata = inet->sk_data_ready;
- svsk->sk_owspace = inet->sk_write_space;
- /*
- * This barrier is necessary in order to prevent race condition
- * with svc_data_ready(), svc_listen_data_ready() and others
- * when calling callbacks above.
- */
- wmb();
- inet->sk_user_data = svsk;
- /* Initialize the socket */
- if (sock->type == SOCK_DGRAM)
- svc_udp_init(svsk, serv);
- else
- svc_tcp_init(svsk, serv);
- trace_svcsock_new_socket(sock);
- return svsk;
- }
- /**
- * svc_addsock - add a listener socket to an RPC service
- * @serv: pointer to RPC service to which to add a new listener
- * @net: caller's network namespace
- * @fd: file descriptor of the new listener
- * @name_return: pointer to buffer to fill in with name of listener
- * @len: size of the buffer
- * @cred: credential
- *
- * Fills in socket name and returns positive length of name if successful.
- * Name is terminated with '\n'. On error, returns a negative errno
- * value.
- */
- int svc_addsock(struct svc_serv *serv, struct net *net, const int fd,
- char *name_return, const size_t len, const struct cred *cred)
- {
- int err = 0;
- struct socket *so = sockfd_lookup(fd, &err);
- struct svc_sock *svsk = NULL;
- struct sockaddr_storage addr;
- struct sockaddr *sin = (struct sockaddr *)&addr;
- int salen;
- if (!so)
- return err;
- err = -EINVAL;
- if (sock_net(so->sk) != net)
- goto out;
- err = -EAFNOSUPPORT;
- if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
- goto out;
- err = -EPROTONOSUPPORT;
- if (so->sk->sk_protocol != IPPROTO_TCP &&
- so->sk->sk_protocol != IPPROTO_UDP)
- goto out;
- err = -EISCONN;
- if (so->state > SS_UNCONNECTED)
- goto out;
- err = -ENOENT;
- if (!try_module_get(THIS_MODULE))
- goto out;
- svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
- if (IS_ERR(svsk)) {
- module_put(THIS_MODULE);
- err = PTR_ERR(svsk);
- goto out;
- }
- salen = kernel_getsockname(svsk->sk_sock, sin);
- if (salen >= 0)
- svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
- svsk->sk_xprt.xpt_cred = get_cred(cred);
- svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
- return svc_one_sock_name(svsk, name_return, len);
- out:
- sockfd_put(so);
- return err;
- }
- EXPORT_SYMBOL_GPL(svc_addsock);
- /*
- * Create socket for RPC service.
- */
- static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
- int protocol,
- struct net *net,
- struct sockaddr *sin, int len,
- int flags)
- {
- struct svc_sock *svsk;
- struct socket *sock;
- int error;
- int type;
- struct sockaddr_storage addr;
- struct sockaddr *newsin = (struct sockaddr *)&addr;
- int newlen;
- int family;
- if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
- printk(KERN_WARNING "svc: only UDP and TCP "
- "sockets supported\n");
- return ERR_PTR(-EINVAL);
- }
- type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
- switch (sin->sa_family) {
- case AF_INET6:
- family = PF_INET6;
- break;
- case AF_INET:
- family = PF_INET;
- break;
- default:
- return ERR_PTR(-EINVAL);
- }
- error = __sock_create(net, family, type, protocol, &sock, 1);
- if (error < 0)
- return ERR_PTR(error);
- svc_reclassify_socket(sock);
- /*
- * If this is an PF_INET6 listener, we want to avoid
- * getting requests from IPv4 remotes. Those should
- * be shunted to a PF_INET listener via rpcbind.
- */
- if (family == PF_INET6)
- ip6_sock_set_v6only(sock->sk);
- if (type == SOCK_STREAM)
- sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
- error = kernel_bind(sock, sin, len);
- if (error < 0)
- goto bummer;
- error = kernel_getsockname(sock, newsin);
- if (error < 0)
- goto bummer;
- newlen = error;
- if (protocol == IPPROTO_TCP) {
- if ((error = kernel_listen(sock, 64)) < 0)
- goto bummer;
- }
- svsk = svc_setup_socket(serv, sock, flags);
- if (IS_ERR(svsk)) {
- error = PTR_ERR(svsk);
- goto bummer;
- }
- svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
- return (struct svc_xprt *)svsk;
- bummer:
- sock_release(sock);
- return ERR_PTR(error);
- }
- /*
- * Detach the svc_sock from the socket so that no
- * more callbacks occur.
- */
- static void svc_sock_detach(struct svc_xprt *xprt)
- {
- struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
- struct sock *sk = svsk->sk_sk;
- /* put back the old socket callbacks */
- lock_sock(sk);
- sk->sk_state_change = svsk->sk_ostate;
- sk->sk_data_ready = svsk->sk_odata;
- sk->sk_write_space = svsk->sk_owspace;
- sk->sk_user_data = NULL;
- release_sock(sk);
- }
- /*
- * Disconnect the socket, and reset the callbacks
- */
- static void svc_tcp_sock_detach(struct svc_xprt *xprt)
- {
- struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
- svc_sock_detach(xprt);
- if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
- svc_tcp_clear_pages(svsk);
- kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
- }
- }
- /*
- * Free the svc_sock's socket resources and the svc_sock itself.
- */
- static void svc_sock_free(struct svc_xprt *xprt)
- {
- struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
- if (svsk->sk_sock->file)
- sockfd_put(svsk->sk_sock);
- else
- sock_release(svsk->sk_sock);
- kfree(svsk);
- }
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