1 // SPDX-License-Identifier: GPL-2.0
3 * linux/net/sunrpc/xprtsock.c
5 * Client-side transport implementation for sockets.
7 * TCP callback races fixes (C) 1998 Red Hat
8 * TCP send fixes (C) 1998 Red Hat
9 * TCP NFS related read + write fixes
10 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
12 * Rewrite of larges part of the code in order to stabilize TCP stuff.
13 * Fix behaviour when socket buffer is full.
14 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
16 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
18 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
19 * <gilles.quillard@bull.net>
22 #include <linux/types.h>
23 #include <linux/string.h>
24 #include <linux/slab.h>
25 #include <linux/module.h>
26 #include <linux/capability.h>
27 #include <linux/pagemap.h>
28 #include <linux/errno.h>
29 #include <linux/socket.h>
31 #include <linux/net.h>
34 #include <linux/udp.h>
35 #include <linux/tcp.h>
36 #include <linux/sunrpc/clnt.h>
37 #include <linux/sunrpc/addr.h>
38 #include <linux/sunrpc/sched.h>
39 #include <linux/sunrpc/svcsock.h>
40 #include <linux/sunrpc/xprtsock.h>
41 #include <linux/file.h>
42 #ifdef CONFIG_SUNRPC_BACKCHANNEL
43 #include <linux/sunrpc/bc_xprt.h>
47 #include <net/checksum.h>
50 #include <linux/bvec.h>
51 #include <linux/highmem.h>
52 #include <linux/uio.h>
53 #include <linux/sched/mm.h>
55 #include <trace/events/sunrpc.h>
59 static void xs_close(struct rpc_xprt *xprt);
60 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
66 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
67 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
68 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
70 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
71 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
73 #define XS_TCP_LINGER_TO (15U * HZ)
74 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
77 * We can register our own files under /proc/sys/sunrpc by
78 * calling register_sysctl_table() again. The files in that
79 * directory become the union of all files registered there.
81 * We simply need to make sure that we don't collide with
82 * someone else's file names!
85 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
86 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
87 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
88 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
89 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
91 static struct ctl_table_header *sunrpc_table_header;
94 * FIXME: changing the UDP slot table size should also resize the UDP
95 * socket buffers for existing UDP transports
97 static struct ctl_table xs_tunables_table[] = {
99 .procname = "udp_slot_table_entries",
100 .data = &xprt_udp_slot_table_entries,
101 .maxlen = sizeof(unsigned int),
103 .proc_handler = proc_dointvec_minmax,
104 .extra1 = &min_slot_table_size,
105 .extra2 = &max_slot_table_size
108 .procname = "tcp_slot_table_entries",
109 .data = &xprt_tcp_slot_table_entries,
110 .maxlen = sizeof(unsigned int),
112 .proc_handler = proc_dointvec_minmax,
113 .extra1 = &min_slot_table_size,
114 .extra2 = &max_slot_table_size
117 .procname = "tcp_max_slot_table_entries",
118 .data = &xprt_max_tcp_slot_table_entries,
119 .maxlen = sizeof(unsigned int),
121 .proc_handler = proc_dointvec_minmax,
122 .extra1 = &min_slot_table_size,
123 .extra2 = &max_tcp_slot_table_limit
126 .procname = "min_resvport",
127 .data = &xprt_min_resvport,
128 .maxlen = sizeof(unsigned int),
130 .proc_handler = proc_dointvec_minmax,
131 .extra1 = &xprt_min_resvport_limit,
132 .extra2 = &xprt_max_resvport_limit
135 .procname = "max_resvport",
136 .data = &xprt_max_resvport,
137 .maxlen = sizeof(unsigned int),
139 .proc_handler = proc_dointvec_minmax,
140 .extra1 = &xprt_min_resvport_limit,
141 .extra2 = &xprt_max_resvport_limit
144 .procname = "tcp_fin_timeout",
145 .data = &xs_tcp_fin_timeout,
146 .maxlen = sizeof(xs_tcp_fin_timeout),
148 .proc_handler = proc_dointvec_jiffies,
153 static struct ctl_table sunrpc_table[] = {
155 .procname = "sunrpc",
157 .child = xs_tunables_table
163 * Wait duration for a reply from the RPC portmapper.
165 #define XS_BIND_TO (60U * HZ)
168 * Delay if a UDP socket connect error occurs. This is most likely some
169 * kind of resource problem on the local host.
171 #define XS_UDP_REEST_TO (2U * HZ)
174 * The reestablish timeout allows clients to delay for a bit before attempting
175 * to reconnect to a server that just dropped our connection.
177 * We implement an exponential backoff when trying to reestablish a TCP
178 * transport connection with the server. Some servers like to drop a TCP
179 * connection when they are overworked, so we start with a short timeout and
180 * increase over time if the server is down or not responding.
182 #define XS_TCP_INIT_REEST_TO (3U * HZ)
185 * TCP idle timeout; client drops the transport socket if it is idle
186 * for this long. Note that we also timeout UDP sockets to prevent
187 * holding port numbers when there is no RPC traffic.
189 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
191 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
192 # undef RPC_DEBUG_DATA
193 # define RPCDBG_FACILITY RPCDBG_TRANS
196 #ifdef RPC_DEBUG_DATA
197 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
199 u8 *buf = (u8 *) packet;
202 dprintk("RPC: %s\n", msg);
203 for (j = 0; j < count && j < 128; j += 4) {
207 dprintk("0x%04x ", j);
209 dprintk("%02x%02x%02x%02x ",
210 buf[j], buf[j+1], buf[j+2], buf[j+3]);
215 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
221 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
223 return (struct rpc_xprt *) sk->sk_user_data;
226 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
228 return (struct sockaddr *) &xprt->addr;
231 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
233 return (struct sockaddr_un *) &xprt->addr;
236 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
238 return (struct sockaddr_in *) &xprt->addr;
241 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
243 return (struct sockaddr_in6 *) &xprt->addr;
246 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
248 struct sockaddr *sap = xs_addr(xprt);
249 struct sockaddr_in6 *sin6;
250 struct sockaddr_in *sin;
251 struct sockaddr_un *sun;
254 switch (sap->sa_family) {
256 sun = xs_addr_un(xprt);
257 strlcpy(buf, sun->sun_path, sizeof(buf));
258 xprt->address_strings[RPC_DISPLAY_ADDR] =
259 kstrdup(buf, GFP_KERNEL);
262 (void)rpc_ntop(sap, buf, sizeof(buf));
263 xprt->address_strings[RPC_DISPLAY_ADDR] =
264 kstrdup(buf, GFP_KERNEL);
265 sin = xs_addr_in(xprt);
266 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
269 (void)rpc_ntop(sap, buf, sizeof(buf));
270 xprt->address_strings[RPC_DISPLAY_ADDR] =
271 kstrdup(buf, GFP_KERNEL);
272 sin6 = xs_addr_in6(xprt);
273 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
279 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
282 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
284 struct sockaddr *sap = xs_addr(xprt);
287 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
288 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
290 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
291 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
294 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
295 const char *protocol,
298 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
299 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
300 xs_format_common_peer_addresses(xprt);
301 xs_format_common_peer_ports(xprt);
304 static void xs_update_peer_port(struct rpc_xprt *xprt)
306 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
307 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
309 xs_format_common_peer_ports(xprt);
312 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
316 for (i = 0; i < RPC_DISPLAY_MAX; i++)
318 case RPC_DISPLAY_PROTO:
319 case RPC_DISPLAY_NETID:
322 kfree(xprt->address_strings[i]);
327 xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
331 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
333 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
334 for (i = 0; i < n; i++) {
337 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
338 if (!buf->pages[i]) {
340 return i > buf->page_base ? i - buf->page_base : 0;
347 xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
351 iov_iter_advance(&msg->msg_iter, seek);
352 ret = sock_recvmsg(sock, msg, flags);
353 return ret > 0 ? ret + seek : ret;
357 xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
358 struct kvec *kvec, size_t count, size_t seek)
360 iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count);
361 return xs_sock_recvmsg(sock, msg, flags, seek);
365 xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
366 struct bio_vec *bvec, unsigned long nr, size_t count,
369 iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count);
370 return xs_sock_recvmsg(sock, msg, flags, seek);
374 xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
377 iov_iter_discard(&msg->msg_iter, READ, count);
378 return sock_recvmsg(sock, msg, flags);
381 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
383 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
385 struct bvec_iter bi = {
390 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
391 for_each_bvec(bv, bvec, bi, bi)
392 flush_dcache_page(bv.bv_page);
396 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
402 xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
403 struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
405 size_t want, seek_init = seek, offset = 0;
408 want = min_t(size_t, count, buf->head[0].iov_len);
410 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
414 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
424 want = xs_alloc_sparse_pages(buf,
425 min_t(size_t, count - offset, buf->page_len),
428 ret = xs_read_bvec(sock, msg, flags, buf->bvec,
429 xdr_buf_pagecount(buf),
430 want + buf->page_base,
431 seek + buf->page_base);
434 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
435 ret -= buf->page_base;
437 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
447 want = min_t(size_t, count - offset, buf->tail[0].iov_len);
449 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
453 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
457 } else if (offset < seek_init)
461 *read = offset - seek_init;
469 xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
471 if (!transport->recv.copied) {
472 if (buf->head[0].iov_len >= transport->recv.offset)
473 memcpy(buf->head[0].iov_base,
474 &transport->recv.xid,
475 transport->recv.offset);
476 transport->recv.copied = transport->recv.offset;
481 xs_read_stream_request_done(struct sock_xprt *transport)
483 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
487 xs_read_stream_check_eor(struct sock_xprt *transport,
490 if (xs_read_stream_request_done(transport))
491 msg->msg_flags |= MSG_EOR;
495 xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
496 int flags, struct rpc_rqst *req)
498 struct xdr_buf *buf = &req->rq_private_buf;
499 size_t want, uninitialized_var(read);
500 ssize_t uninitialized_var(ret);
502 xs_read_header(transport, buf);
504 want = transport->recv.len - transport->recv.offset;
506 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
507 transport->recv.copied + want,
508 transport->recv.copied,
510 transport->recv.offset += read;
511 transport->recv.copied += read;
514 if (transport->recv.offset == transport->recv.len)
515 xs_read_stream_check_eor(transport, msg);
525 msg->msg_flags |= MSG_TRUNC;
530 return ret < 0 ? ret : read;
534 xs_read_stream_headersize(bool isfrag)
537 return sizeof(__be32);
538 return 3 * sizeof(__be32);
542 xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
543 int flags, size_t want, size_t seek)
546 .iov_base = &transport->recv.fraghdr,
549 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
552 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
554 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
556 struct rpc_xprt *xprt = &transport->xprt;
557 struct rpc_rqst *req;
560 /* Look up and lock the request corresponding to the given XID */
561 req = xprt_lookup_bc_request(xprt, transport->recv.xid);
563 printk(KERN_WARNING "Callback slot table overflowed\n");
566 if (transport->recv.copied && !req->rq_private_buf.len)
569 ret = xs_read_stream_request(transport, msg, flags, req);
570 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
571 xprt_complete_bc_request(req, transport->recv.copied);
573 req->rq_private_buf.len = transport->recv.copied;
577 #else /* CONFIG_SUNRPC_BACKCHANNEL */
579 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
583 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
586 xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
588 struct rpc_xprt *xprt = &transport->xprt;
589 struct rpc_rqst *req;
592 /* Look up and lock the request corresponding to the given XID */
593 spin_lock(&xprt->queue_lock);
594 req = xprt_lookup_rqst(xprt, transport->recv.xid);
595 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
596 msg->msg_flags |= MSG_TRUNC;
600 spin_unlock(&xprt->queue_lock);
602 ret = xs_read_stream_request(transport, msg, flags, req);
604 spin_lock(&xprt->queue_lock);
605 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
606 xprt_complete_rqst(req->rq_task, transport->recv.copied);
608 req->rq_private_buf.len = transport->recv.copied;
609 xprt_unpin_rqst(req);
611 spin_unlock(&xprt->queue_lock);
616 xs_read_stream(struct sock_xprt *transport, int flags)
618 struct msghdr msg = { 0 };
619 size_t want, read = 0;
622 if (transport->recv.len == 0) {
623 want = xs_read_stream_headersize(transport->recv.copied != 0);
624 ret = xs_read_stream_header(transport, &msg, flags, want,
625 transport->recv.offset);
628 transport->recv.offset = ret;
629 if (transport->recv.offset != want)
630 return transport->recv.offset;
631 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
632 RPC_FRAGMENT_SIZE_MASK;
633 transport->recv.offset -= sizeof(transport->recv.fraghdr);
637 switch (be32_to_cpu(transport->recv.calldir)) {
639 msg.msg_flags |= MSG_TRUNC;
642 ret = xs_read_stream_call(transport, &msg, flags);
645 ret = xs_read_stream_reply(transport, &msg, flags);
647 if (msg.msg_flags & MSG_TRUNC) {
648 transport->recv.calldir = cpu_to_be32(-1);
649 transport->recv.copied = -1;
654 if (transport->recv.offset < transport->recv.len) {
655 if (!(msg.msg_flags & MSG_TRUNC))
658 ret = xs_read_discard(transport->sock, &msg, flags,
659 transport->recv.len - transport->recv.offset);
662 transport->recv.offset += ret;
664 if (transport->recv.offset != transport->recv.len)
667 if (xs_read_stream_request_done(transport)) {
668 trace_xs_stream_read_request(transport);
669 transport->recv.copied = 0;
671 transport->recv.offset = 0;
672 transport->recv.len = 0;
675 return ret != 0 ? ret : -ESHUTDOWN;
678 static __poll_t xs_poll_socket(struct sock_xprt *transport)
680 return transport->sock->ops->poll(transport->file, transport->sock,
684 static bool xs_poll_socket_readable(struct sock_xprt *transport)
686 __poll_t events = xs_poll_socket(transport);
688 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
691 static void xs_poll_check_readable(struct sock_xprt *transport)
694 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
695 if (!xs_poll_socket_readable(transport))
697 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
698 queue_work(xprtiod_workqueue, &transport->recv_worker);
701 static void xs_stream_data_receive(struct sock_xprt *transport)
706 mutex_lock(&transport->recv_mutex);
707 if (transport->sock == NULL)
710 ret = xs_read_stream(transport, MSG_DONTWAIT);
716 if (ret == -ESHUTDOWN)
717 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
719 xs_poll_check_readable(transport);
721 mutex_unlock(&transport->recv_mutex);
722 trace_xs_stream_read_data(&transport->xprt, ret, read);
725 static void xs_stream_data_receive_workfn(struct work_struct *work)
727 struct sock_xprt *transport =
728 container_of(work, struct sock_xprt, recv_worker);
729 unsigned int pflags = memalloc_nofs_save();
731 xs_stream_data_receive(transport);
732 memalloc_nofs_restore(pflags);
736 xs_stream_reset_connect(struct sock_xprt *transport)
738 transport->recv.offset = 0;
739 transport->recv.len = 0;
740 transport->recv.copied = 0;
741 transport->xmit.offset = 0;
745 xs_stream_start_connect(struct sock_xprt *transport)
747 transport->xprt.stat.connect_count++;
748 transport->xprt.stat.connect_start = jiffies;
751 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
753 static int xs_sendmsg(struct socket *sock, struct msghdr *msg, size_t seek)
756 iov_iter_advance(&msg->msg_iter, seek);
757 return sock_sendmsg(sock, msg);
760 static int xs_send_kvec(struct socket *sock, struct msghdr *msg, struct kvec *vec, size_t seek)
762 iov_iter_kvec(&msg->msg_iter, WRITE, vec, 1, vec->iov_len);
763 return xs_sendmsg(sock, msg, seek);
766 static int xs_send_pagedata(struct socket *sock, struct msghdr *msg, struct xdr_buf *xdr, size_t base)
770 err = xdr_alloc_bvec(xdr, GFP_KERNEL);
774 iov_iter_bvec(&msg->msg_iter, WRITE, xdr->bvec,
775 xdr_buf_pagecount(xdr),
776 xdr->page_len + xdr->page_base);
777 return xs_sendmsg(sock, msg, base + xdr->page_base);
780 #define xs_record_marker_len() sizeof(rpc_fraghdr)
784 * - sending from byte 0 of the message
785 * - the message is wholly contained in @xdr's head iovec
787 static int xs_send_rm_and_kvec(struct socket *sock, struct msghdr *msg,
788 rpc_fraghdr marker, struct kvec *vec, size_t base)
790 struct kvec iov[2] = {
793 .iov_len = sizeof(marker)
797 size_t len = iov[0].iov_len + iov[1].iov_len;
799 iov_iter_kvec(&msg->msg_iter, WRITE, iov, 2, len);
800 return xs_sendmsg(sock, msg, base);
804 * xs_sendpages - write pages directly to a socket
805 * @sock: socket to send on
806 * @addr: UDP only -- address of destination
807 * @addrlen: UDP only -- length of destination address
808 * @xdr: buffer containing this request
809 * @base: starting position in the buffer
810 * @rm: stream record marker field
811 * @sent_p: return the total number of bytes successfully queued for sending
814 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, rpc_fraghdr rm, int *sent_p)
816 struct msghdr msg = {
818 .msg_namelen = addrlen,
819 .msg_flags = XS_SENDMSG_FLAGS | MSG_MORE,
821 unsigned int rmsize = rm ? sizeof(rm) : 0;
822 unsigned int remainder = rmsize + xdr->len - base;
829 want = xdr->head[0].iov_len + rmsize;
831 unsigned int len = want - base;
834 msg.msg_flags &= ~MSG_MORE;
836 err = xs_send_rm_and_kvec(sock, &msg, rm,
837 &xdr->head[0], base);
839 err = xs_send_kvec(sock, &msg, &xdr->head[0], base);
840 if (remainder == 0 || err != len)
847 if (base < xdr->page_len) {
848 unsigned int len = xdr->page_len - base;
851 msg.msg_flags &= ~MSG_MORE;
852 err = xs_send_pagedata(sock, &msg, xdr, base);
853 if (remainder == 0 || err != len)
858 base -= xdr->page_len;
860 if (base >= xdr->tail[0].iov_len)
862 msg.msg_flags &= ~MSG_MORE;
863 err = xs_send_kvec(sock, &msg, &xdr->tail[0], base);
873 * xs_nospace - handle transmit was incomplete
874 * @req: pointer to RPC request
875 * @transport: pointer to struct sock_xprt
878 static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport)
880 struct rpc_xprt *xprt = &transport->xprt;
881 struct sock *sk = transport->inet;
884 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
885 req->rq_task->tk_pid,
886 req->rq_slen - transport->xmit.offset,
889 /* Protect against races with write_space */
890 spin_lock(&xprt->transport_lock);
892 /* Don't race with disconnect */
893 if (xprt_connected(xprt)) {
894 struct socket_wq *wq;
897 wq = rcu_dereference(sk->sk_wq);
898 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
901 /* wait for more buffer space */
902 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
903 sk->sk_write_pending++;
904 xprt_wait_for_buffer_space(xprt);
908 spin_unlock(&xprt->transport_lock);
912 static int xs_sock_nospace(struct rpc_rqst *req)
914 struct sock_xprt *transport =
915 container_of(req->rq_xprt, struct sock_xprt, xprt);
916 struct sock *sk = transport->inet;
920 if (!sock_writeable(sk))
921 ret = xs_nospace(req, transport);
926 static int xs_stream_nospace(struct rpc_rqst *req)
928 struct sock_xprt *transport =
929 container_of(req->rq_xprt, struct sock_xprt, xprt);
930 struct sock *sk = transport->inet;
934 if (!sk_stream_memory_free(sk))
935 ret = xs_nospace(req, transport);
941 xs_stream_prepare_request(struct rpc_rqst *req)
943 xdr_free_bvec(&req->rq_rcv_buf);
944 req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL);
948 * Determine if the previous message in the stream was aborted before it
949 * could complete transmission.
952 xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
954 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
958 * Return the stream record marker field for a record of length < 2^31-1
961 xs_stream_record_marker(struct xdr_buf *xdr)
965 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
969 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
970 * @req: pointer to RPC request
973 * 0: The request has been sent
974 * EAGAIN: The socket was blocked, please call again later to
975 * complete the request
976 * ENOTCONN: Caller needs to invoke connect logic then call again
977 * other: Some other error occured, the request was not sent
979 static int xs_local_send_request(struct rpc_rqst *req)
981 struct rpc_xprt *xprt = req->rq_xprt;
982 struct sock_xprt *transport =
983 container_of(xprt, struct sock_xprt, xprt);
984 struct xdr_buf *xdr = &req->rq_snd_buf;
985 rpc_fraghdr rm = xs_stream_record_marker(xdr);
986 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
990 /* Close the stream if the previous transmission was incomplete */
991 if (xs_send_request_was_aborted(transport, req)) {
992 xprt_force_disconnect(xprt);
996 xs_pktdump("packet data:",
997 req->rq_svec->iov_base, req->rq_svec->iov_len);
999 req->rq_xtime = ktime_get();
1000 status = xs_sendpages(transport->sock, NULL, 0, xdr,
1001 transport->xmit.offset, rm, &sent);
1002 dprintk("RPC: %s(%u) = %d\n",
1003 __func__, xdr->len - transport->xmit.offset, status);
1005 if (status == -EAGAIN && sock_writeable(transport->inet))
1008 if (likely(sent > 0) || status == 0) {
1009 transport->xmit.offset += sent;
1010 req->rq_bytes_sent = transport->xmit.offset;
1011 if (likely(req->rq_bytes_sent >= msglen)) {
1012 req->rq_xmit_bytes_sent += transport->xmit.offset;
1013 transport->xmit.offset = 0;
1023 status = xs_stream_nospace(req);
1026 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1030 xprt_force_disconnect(xprt);
1038 * xs_udp_send_request - write an RPC request to a UDP socket
1039 * @req: pointer to RPC request
1042 * 0: The request has been sent
1043 * EAGAIN: The socket was blocked, please call again later to
1044 * complete the request
1045 * ENOTCONN: Caller needs to invoke connect logic then call again
1046 * other: Some other error occurred, the request was not sent
1048 static int xs_udp_send_request(struct rpc_rqst *req)
1050 struct rpc_xprt *xprt = req->rq_xprt;
1051 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1052 struct xdr_buf *xdr = &req->rq_snd_buf;
1056 xs_pktdump("packet data:",
1057 req->rq_svec->iov_base,
1058 req->rq_svec->iov_len);
1060 if (!xprt_bound(xprt))
1063 if (!xprt_request_get_cong(xprt, req))
1066 req->rq_xtime = ktime_get();
1067 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
1070 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
1073 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
1074 if (status == -EPERM)
1075 goto process_status;
1077 if (status == -EAGAIN && sock_writeable(transport->inet))
1080 if (sent > 0 || status == 0) {
1081 req->rq_xmit_bytes_sent += sent;
1082 if (sent >= req->rq_slen)
1084 /* Still some bytes left; set up for a retry later. */
1092 /* Should we call xs_close() here? */
1095 status = xs_sock_nospace(req);
1102 /* When the server has died, an ICMP port unreachable message
1103 * prompts ECONNREFUSED. */
1106 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1114 * xs_tcp_send_request - write an RPC request to a TCP socket
1115 * @req: pointer to RPC request
1118 * 0: The request has been sent
1119 * EAGAIN: The socket was blocked, please call again later to
1120 * complete the request
1121 * ENOTCONN: Caller needs to invoke connect logic then call again
1122 * other: Some other error occurred, the request was not sent
1124 * XXX: In the case of soft timeouts, should we eventually give up
1125 * if sendmsg is not able to make progress?
1127 static int xs_tcp_send_request(struct rpc_rqst *req)
1129 struct rpc_xprt *xprt = req->rq_xprt;
1130 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1131 struct xdr_buf *xdr = &req->rq_snd_buf;
1132 rpc_fraghdr rm = xs_stream_record_marker(xdr);
1133 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1134 bool vm_wait = false;
1138 /* Close the stream if the previous transmission was incomplete */
1139 if (xs_send_request_was_aborted(transport, req)) {
1140 if (transport->sock != NULL)
1141 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1145 xs_pktdump("packet data:",
1146 req->rq_svec->iov_base,
1147 req->rq_svec->iov_len);
1149 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1150 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1152 /* Continue transmitting the packet/record. We must be careful
1153 * to cope with writespace callbacks arriving _after_ we have
1154 * called sendmsg(). */
1155 req->rq_xtime = ktime_get();
1158 status = xs_sendpages(transport->sock, NULL, 0, xdr,
1159 transport->xmit.offset, rm, &sent);
1161 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1162 xdr->len - transport->xmit.offset, status);
1164 /* If we've sent the entire packet, immediately
1165 * reset the count of bytes sent. */
1166 transport->xmit.offset += sent;
1167 req->rq_bytes_sent = transport->xmit.offset;
1168 if (likely(req->rq_bytes_sent >= msglen)) {
1169 req->rq_xmit_bytes_sent += transport->xmit.offset;
1170 transport->xmit.offset = 0;
1174 WARN_ON_ONCE(sent == 0 && status == 0);
1176 if (status == -EAGAIN ) {
1178 * Return EAGAIN if we're sure we're hitting the
1179 * socket send buffer limits.
1181 if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
1184 * Did we hit a memory allocation failure?
1190 /* Retry, knowing now that we're below the
1191 * socket send buffer limit
1205 /* Should we call xs_close() here? */
1208 status = xs_stream_nospace(req);
1218 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1225 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1227 transport->old_data_ready = sk->sk_data_ready;
1228 transport->old_state_change = sk->sk_state_change;
1229 transport->old_write_space = sk->sk_write_space;
1230 transport->old_error_report = sk->sk_error_report;
1233 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1235 sk->sk_data_ready = transport->old_data_ready;
1236 sk->sk_state_change = transport->old_state_change;
1237 sk->sk_write_space = transport->old_write_space;
1238 sk->sk_error_report = transport->old_error_report;
1241 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1243 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1245 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1246 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1247 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1248 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1251 static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1253 set_bit(nr, &transport->sock_state);
1254 queue_work(xprtiod_workqueue, &transport->error_worker);
1257 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1259 smp_mb__before_atomic();
1260 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1261 clear_bit(XPRT_CLOSING, &xprt->state);
1262 xs_sock_reset_state_flags(xprt);
1263 smp_mb__after_atomic();
1267 * xs_error_report - callback to handle TCP socket state errors
1270 * Note: we don't call sock_error() since there may be a rpc_task
1271 * using the socket, and so we don't want to clear sk->sk_err.
1273 static void xs_error_report(struct sock *sk)
1275 struct sock_xprt *transport;
1276 struct rpc_xprt *xprt;
1278 read_lock_bh(&sk->sk_callback_lock);
1279 if (!(xprt = xprt_from_sock(sk)))
1282 transport = container_of(xprt, struct sock_xprt, xprt);
1283 transport->xprt_err = -sk->sk_err;
1284 if (transport->xprt_err == 0)
1286 dprintk("RPC: xs_error_report client %p, error=%d...\n",
1287 xprt, -transport->xprt_err);
1288 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1290 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1291 smp_mb__before_atomic();
1292 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1294 read_unlock_bh(&sk->sk_callback_lock);
1297 static void xs_reset_transport(struct sock_xprt *transport)
1299 struct socket *sock = transport->sock;
1300 struct sock *sk = transport->inet;
1301 struct rpc_xprt *xprt = &transport->xprt;
1302 struct file *filp = transport->file;
1307 * Make sure we're calling this in a context from which it is safe
1308 * to call __fput_sync(). In practice that means rpciod and the
1311 if (!(current->flags & PF_WQ_WORKER)) {
1313 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1317 if (atomic_read(&transport->xprt.swapper))
1318 sk_clear_memalloc(sk);
1320 kernel_sock_shutdown(sock, SHUT_RDWR);
1322 mutex_lock(&transport->recv_mutex);
1323 write_lock_bh(&sk->sk_callback_lock);
1324 transport->inet = NULL;
1325 transport->sock = NULL;
1326 transport->file = NULL;
1328 sk->sk_user_data = NULL;
1330 xs_restore_old_callbacks(transport, sk);
1331 xprt_clear_connected(xprt);
1332 write_unlock_bh(&sk->sk_callback_lock);
1333 xs_sock_reset_connection_flags(xprt);
1334 /* Reset stream record info */
1335 xs_stream_reset_connect(transport);
1336 mutex_unlock(&transport->recv_mutex);
1338 trace_rpc_socket_close(xprt, sock);
1341 xprt_disconnect_done(xprt);
1345 * xs_close - close a socket
1348 * This is used when all requests are complete; ie, no DRC state remains
1349 * on the server we want to save.
1351 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1352 * xs_reset_transport() zeroing the socket from underneath a writer.
1354 static void xs_close(struct rpc_xprt *xprt)
1356 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1358 dprintk("RPC: xs_close xprt %p\n", xprt);
1360 xs_reset_transport(transport);
1361 xprt->reestablish_timeout = 0;
1364 static void xs_inject_disconnect(struct rpc_xprt *xprt)
1366 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1368 xprt_disconnect_done(xprt);
1371 static void xs_xprt_free(struct rpc_xprt *xprt)
1373 xs_free_peer_addresses(xprt);
1378 * xs_destroy - prepare to shutdown a transport
1379 * @xprt: doomed transport
1382 static void xs_destroy(struct rpc_xprt *xprt)
1384 struct sock_xprt *transport = container_of(xprt,
1385 struct sock_xprt, xprt);
1386 dprintk("RPC: xs_destroy xprt %p\n", xprt);
1388 cancel_delayed_work_sync(&transport->connect_worker);
1390 cancel_work_sync(&transport->recv_worker);
1391 cancel_work_sync(&transport->error_worker);
1393 module_put(THIS_MODULE);
1397 * xs_udp_data_read_skb - receive callback for UDP sockets
1403 static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1405 struct sk_buff *skb)
1407 struct rpc_task *task;
1408 struct rpc_rqst *rovr;
1409 int repsize, copied;
1415 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1419 /* Copy the XID from the skb... */
1420 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1424 /* Look up and lock the request corresponding to the given XID */
1425 spin_lock(&xprt->queue_lock);
1426 rovr = xprt_lookup_rqst(xprt, *xp);
1429 xprt_pin_rqst(rovr);
1430 xprt_update_rtt(rovr->rq_task);
1431 spin_unlock(&xprt->queue_lock);
1432 task = rovr->rq_task;
1434 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1437 /* Suck it into the iovec, verify checksum if not done by hw. */
1438 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1439 spin_lock(&xprt->queue_lock);
1440 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1445 spin_lock(&xprt->transport_lock);
1446 xprt_adjust_cwnd(xprt, task, copied);
1447 spin_unlock(&xprt->transport_lock);
1448 spin_lock(&xprt->queue_lock);
1449 xprt_complete_rqst(task, copied);
1450 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1452 xprt_unpin_rqst(rovr);
1454 spin_unlock(&xprt->queue_lock);
1457 static void xs_udp_data_receive(struct sock_xprt *transport)
1459 struct sk_buff *skb;
1463 mutex_lock(&transport->recv_mutex);
1464 sk = transport->inet;
1468 skb = skb_recv_udp(sk, 0, 1, &err);
1471 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1475 xs_poll_check_readable(transport);
1477 mutex_unlock(&transport->recv_mutex);
1480 static void xs_udp_data_receive_workfn(struct work_struct *work)
1482 struct sock_xprt *transport =
1483 container_of(work, struct sock_xprt, recv_worker);
1484 unsigned int pflags = memalloc_nofs_save();
1486 xs_udp_data_receive(transport);
1487 memalloc_nofs_restore(pflags);
1491 * xs_data_ready - "data ready" callback for UDP sockets
1492 * @sk: socket with data to read
1495 static void xs_data_ready(struct sock *sk)
1497 struct rpc_xprt *xprt;
1499 read_lock_bh(&sk->sk_callback_lock);
1500 dprintk("RPC: xs_data_ready...\n");
1501 xprt = xprt_from_sock(sk);
1503 struct sock_xprt *transport = container_of(xprt,
1504 struct sock_xprt, xprt);
1505 transport->old_data_ready(sk);
1506 /* Any data means we had a useful conversation, so
1507 * then we don't need to delay the next reconnect
1509 if (xprt->reestablish_timeout)
1510 xprt->reestablish_timeout = 0;
1511 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1512 queue_work(xprtiod_workqueue, &transport->recv_worker);
1514 read_unlock_bh(&sk->sk_callback_lock);
1518 * Helper function to force a TCP close if the server is sending
1519 * junk and/or it has put us in CLOSE_WAIT
1521 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1523 xprt_force_disconnect(xprt);
1526 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1527 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1531 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1534 * xs_tcp_state_change - callback to handle TCP socket state changes
1535 * @sk: socket whose state has changed
1538 static void xs_tcp_state_change(struct sock *sk)
1540 struct rpc_xprt *xprt;
1541 struct sock_xprt *transport;
1543 read_lock_bh(&sk->sk_callback_lock);
1544 if (!(xprt = xprt_from_sock(sk)))
1546 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1547 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1548 sk->sk_state, xprt_connected(xprt),
1549 sock_flag(sk, SOCK_DEAD),
1550 sock_flag(sk, SOCK_ZAPPED),
1553 transport = container_of(xprt, struct sock_xprt, xprt);
1554 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1555 switch (sk->sk_state) {
1556 case TCP_ESTABLISHED:
1557 if (!xprt_test_and_set_connected(xprt)) {
1558 xprt->connect_cookie++;
1559 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1560 xprt_clear_connecting(xprt);
1562 xprt->stat.connect_count++;
1563 xprt->stat.connect_time += (long)jiffies -
1564 xprt->stat.connect_start;
1565 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1569 /* The client initiated a shutdown of the socket */
1570 xprt->connect_cookie++;
1571 xprt->reestablish_timeout = 0;
1572 set_bit(XPRT_CLOSING, &xprt->state);
1573 smp_mb__before_atomic();
1574 clear_bit(XPRT_CONNECTED, &xprt->state);
1575 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1576 smp_mb__after_atomic();
1578 case TCP_CLOSE_WAIT:
1579 /* The server initiated a shutdown of the socket */
1580 xprt->connect_cookie++;
1581 clear_bit(XPRT_CONNECTED, &xprt->state);
1582 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1586 * If the server closed down the connection, make sure that
1587 * we back off before reconnecting
1589 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1590 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1593 set_bit(XPRT_CLOSING, &xprt->state);
1594 smp_mb__before_atomic();
1595 clear_bit(XPRT_CONNECTED, &xprt->state);
1596 smp_mb__after_atomic();
1599 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1600 &transport->sock_state))
1601 xprt_clear_connecting(xprt);
1602 clear_bit(XPRT_CLOSING, &xprt->state);
1603 /* Trigger the socket release */
1604 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1607 read_unlock_bh(&sk->sk_callback_lock);
1610 static void xs_write_space(struct sock *sk)
1612 struct socket_wq *wq;
1613 struct sock_xprt *transport;
1614 struct rpc_xprt *xprt;
1618 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1620 if (unlikely(!(xprt = xprt_from_sock(sk))))
1622 transport = container_of(xprt, struct sock_xprt, xprt);
1624 wq = rcu_dereference(sk->sk_wq);
1625 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1628 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1629 sk->sk_write_pending--;
1635 * xs_udp_write_space - callback invoked when socket buffer space
1637 * @sk: socket whose state has changed
1639 * Called when more output buffer space is available for this socket.
1640 * We try not to wake our writers until they can make "significant"
1641 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1642 * with a bunch of small requests.
1644 static void xs_udp_write_space(struct sock *sk)
1646 read_lock_bh(&sk->sk_callback_lock);
1648 /* from net/core/sock.c:sock_def_write_space */
1649 if (sock_writeable(sk))
1652 read_unlock_bh(&sk->sk_callback_lock);
1656 * xs_tcp_write_space - callback invoked when socket buffer space
1658 * @sk: socket whose state has changed
1660 * Called when more output buffer space is available for this socket.
1661 * We try not to wake our writers until they can make "significant"
1662 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1663 * with a bunch of small requests.
1665 static void xs_tcp_write_space(struct sock *sk)
1667 read_lock_bh(&sk->sk_callback_lock);
1669 /* from net/core/stream.c:sk_stream_write_space */
1670 if (sk_stream_is_writeable(sk))
1673 read_unlock_bh(&sk->sk_callback_lock);
1676 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1678 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1679 struct sock *sk = transport->inet;
1681 if (transport->rcvsize) {
1682 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1683 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1685 if (transport->sndsize) {
1686 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1687 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1688 sk->sk_write_space(sk);
1693 * xs_udp_set_buffer_size - set send and receive limits
1694 * @xprt: generic transport
1695 * @sndsize: requested size of send buffer, in bytes
1696 * @rcvsize: requested size of receive buffer, in bytes
1698 * Set socket send and receive buffer size limits.
1700 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1702 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1704 transport->sndsize = 0;
1706 transport->sndsize = sndsize + 1024;
1707 transport->rcvsize = 0;
1709 transport->rcvsize = rcvsize + 1024;
1711 xs_udp_do_set_buffer_size(xprt);
1715 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1716 * @xprt: controlling transport
1717 * @task: task that timed out
1719 * Adjust the congestion window after a retransmit timeout has occurred.
1721 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1723 spin_lock(&xprt->transport_lock);
1724 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1725 spin_unlock(&xprt->transport_lock);
1728 static int xs_get_random_port(void)
1730 unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1731 unsigned short range;
1732 unsigned short rand;
1736 range = max - min + 1;
1737 rand = (unsigned short) prandom_u32() % range;
1742 * xs_set_reuseaddr_port - set the socket's port and address reuse options
1745 * Note that this function has to be called on all sockets that share the
1746 * same port, and it must be called before binding.
1748 static void xs_sock_set_reuseport(struct socket *sock)
1752 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
1753 (char *)&opt, sizeof(opt));
1756 static unsigned short xs_sock_getport(struct socket *sock)
1758 struct sockaddr_storage buf;
1759 unsigned short port = 0;
1761 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1763 switch (buf.ss_family) {
1765 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1768 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1775 * xs_set_port - reset the port number in the remote endpoint address
1776 * @xprt: generic transport
1777 * @port: new port number
1780 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1782 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1784 rpc_set_port(xs_addr(xprt), port);
1785 xs_update_peer_port(xprt);
1788 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1790 if (transport->srcport == 0)
1791 transport->srcport = xs_sock_getport(sock);
1794 static int xs_get_srcport(struct sock_xprt *transport)
1796 int port = transport->srcport;
1798 if (port == 0 && transport->xprt.resvport)
1799 port = xs_get_random_port();
1803 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1805 if (transport->srcport != 0)
1806 transport->srcport = 0;
1807 if (!transport->xprt.resvport)
1809 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1810 return xprt_max_resvport;
1813 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1815 struct sockaddr_storage myaddr;
1817 int port = xs_get_srcport(transport);
1818 unsigned short last;
1821 * If we are asking for any ephemeral port (i.e. port == 0 &&
1822 * transport->xprt.resvport == 0), don't bind. Let the local
1823 * port selection happen implicitly when the socket is used
1824 * (for example at connect time).
1826 * This ensures that we can continue to establish TCP
1827 * connections even when all local ephemeral ports are already
1828 * a part of some TCP connection. This makes no difference
1829 * for UDP sockets, but also doens't harm them.
1831 * If we're asking for any reserved port (i.e. port == 0 &&
1832 * transport->xprt.resvport == 1) xs_get_srcport above will
1833 * ensure that port is non-zero and we will bind as needed.
1838 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1840 rpc_set_port((struct sockaddr *)&myaddr, port);
1841 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1842 transport->xprt.addrlen);
1844 transport->srcport = port;
1848 port = xs_next_srcport(transport, port);
1851 } while (err == -EADDRINUSE && nloop != 2);
1853 if (myaddr.ss_family == AF_INET)
1854 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1855 &((struct sockaddr_in *)&myaddr)->sin_addr,
1856 port, err ? "failed" : "ok", err);
1858 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1859 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1860 port, err ? "failed" : "ok", err);
1865 * We don't support autobind on AF_LOCAL sockets
1867 static void xs_local_rpcbind(struct rpc_task *task)
1869 xprt_set_bound(task->tk_xprt);
1872 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1876 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1877 static struct lock_class_key xs_key[2];
1878 static struct lock_class_key xs_slock_key[2];
1880 static inline void xs_reclassify_socketu(struct socket *sock)
1882 struct sock *sk = sock->sk;
1884 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1885 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1888 static inline void xs_reclassify_socket4(struct socket *sock)
1890 struct sock *sk = sock->sk;
1892 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1893 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1896 static inline void xs_reclassify_socket6(struct socket *sock)
1898 struct sock *sk = sock->sk;
1900 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1901 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1904 static inline void xs_reclassify_socket(int family, struct socket *sock)
1906 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1911 xs_reclassify_socketu(sock);
1914 xs_reclassify_socket4(sock);
1917 xs_reclassify_socket6(sock);
1922 static inline void xs_reclassify_socket(int family, struct socket *sock)
1927 static void xs_dummy_setup_socket(struct work_struct *work)
1931 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1932 struct sock_xprt *transport, int family, int type,
1933 int protocol, bool reuseport)
1936 struct socket *sock;
1939 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1941 dprintk("RPC: can't create %d transport socket (%d).\n",
1945 xs_reclassify_socket(family, sock);
1948 xs_sock_set_reuseport(sock);
1950 err = xs_bind(transport, sock);
1956 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1958 return ERR_CAST(filp);
1959 transport->file = filp;
1963 return ERR_PTR(err);
1966 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1967 struct socket *sock)
1969 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1972 if (!transport->inet) {
1973 struct sock *sk = sock->sk;
1975 write_lock_bh(&sk->sk_callback_lock);
1977 xs_save_old_callbacks(transport, sk);
1979 sk->sk_user_data = xprt;
1980 sk->sk_data_ready = xs_data_ready;
1981 sk->sk_write_space = xs_udp_write_space;
1982 sock_set_flag(sk, SOCK_FASYNC);
1983 sk->sk_error_report = xs_error_report;
1985 xprt_clear_connected(xprt);
1987 /* Reset to new socket */
1988 transport->sock = sock;
1989 transport->inet = sk;
1991 write_unlock_bh(&sk->sk_callback_lock);
1994 xs_stream_start_connect(transport);
1996 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
2000 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
2001 * @transport: socket transport to connect
2003 static int xs_local_setup_socket(struct sock_xprt *transport)
2005 struct rpc_xprt *xprt = &transport->xprt;
2007 struct socket *sock;
2010 status = __sock_create(xprt->xprt_net, AF_LOCAL,
2011 SOCK_STREAM, 0, &sock, 1);
2013 dprintk("RPC: can't create AF_LOCAL "
2014 "transport socket (%d).\n", -status);
2017 xs_reclassify_socket(AF_LOCAL, sock);
2019 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
2021 status = PTR_ERR(filp);
2024 transport->file = filp;
2026 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
2027 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2029 status = xs_local_finish_connecting(xprt, sock);
2030 trace_rpc_socket_connect(xprt, sock, status);
2033 dprintk("RPC: xprt %p connected to %s\n",
2034 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2035 xprt->stat.connect_count++;
2036 xprt->stat.connect_time += (long)jiffies -
2037 xprt->stat.connect_start;
2038 xprt_set_connected(xprt);
2042 dprintk("RPC: xprt %p: socket %s does not exist\n",
2043 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2046 dprintk("RPC: xprt %p: connection refused for %s\n",
2047 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2050 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2052 xprt->address_strings[RPC_DISPLAY_ADDR]);
2056 xprt_clear_connecting(xprt);
2057 xprt_wake_pending_tasks(xprt, status);
2061 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2063 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2066 if (RPC_IS_ASYNC(task)) {
2068 * We want the AF_LOCAL connect to be resolved in the
2069 * filesystem namespace of the process making the rpc
2070 * call. Thus we connect synchronously.
2072 * If we want to support asynchronous AF_LOCAL calls,
2073 * we'll need to figure out how to pass a namespace to
2076 task->tk_rpc_status = -ENOTCONN;
2077 rpc_exit(task, -ENOTCONN);
2080 ret = xs_local_setup_socket(transport);
2081 if (ret && !RPC_IS_SOFTCONN(task))
2082 msleep_interruptible(15000);
2085 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2087 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
2088 * know that we have exclusive access to the socket), to guard against
2089 * races with xs_reset_transport.
2091 static void xs_set_memalloc(struct rpc_xprt *xprt)
2093 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2097 * If there's no sock, then we have nothing to set. The
2098 * reconnecting process will get it for us.
2100 if (!transport->inet)
2102 if (atomic_read(&xprt->swapper))
2103 sk_set_memalloc(transport->inet);
2107 * xs_enable_swap - Tag this transport as being used for swap.
2108 * @xprt: transport to tag
2110 * Take a reference to this transport on behalf of the rpc_clnt, and
2111 * optionally mark it for swapping if it wasn't already.
2114 xs_enable_swap(struct rpc_xprt *xprt)
2116 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2118 if (atomic_inc_return(&xprt->swapper) != 1)
2120 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2121 return -ERESTARTSYS;
2123 sk_set_memalloc(xs->inet);
2124 xprt_release_xprt(xprt, NULL);
2129 * xs_disable_swap - Untag this transport as being used for swap.
2130 * @xprt: transport to tag
2132 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2133 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2136 xs_disable_swap(struct rpc_xprt *xprt)
2138 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2140 if (!atomic_dec_and_test(&xprt->swapper))
2142 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2145 sk_clear_memalloc(xs->inet);
2146 xprt_release_xprt(xprt, NULL);
2149 static void xs_set_memalloc(struct rpc_xprt *xprt)
2154 xs_enable_swap(struct rpc_xprt *xprt)
2160 xs_disable_swap(struct rpc_xprt *xprt)
2165 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2167 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2169 if (!transport->inet) {
2170 struct sock *sk = sock->sk;
2172 write_lock_bh(&sk->sk_callback_lock);
2174 xs_save_old_callbacks(transport, sk);
2176 sk->sk_user_data = xprt;
2177 sk->sk_data_ready = xs_data_ready;
2178 sk->sk_write_space = xs_udp_write_space;
2179 sock_set_flag(sk, SOCK_FASYNC);
2181 xprt_set_connected(xprt);
2183 /* Reset to new socket */
2184 transport->sock = sock;
2185 transport->inet = sk;
2187 xs_set_memalloc(xprt);
2189 write_unlock_bh(&sk->sk_callback_lock);
2191 xs_udp_do_set_buffer_size(xprt);
2193 xprt->stat.connect_start = jiffies;
2196 static void xs_udp_setup_socket(struct work_struct *work)
2198 struct sock_xprt *transport =
2199 container_of(work, struct sock_xprt, connect_worker.work);
2200 struct rpc_xprt *xprt = &transport->xprt;
2201 struct socket *sock;
2204 sock = xs_create_sock(xprt, transport,
2205 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2206 IPPROTO_UDP, false);
2210 dprintk("RPC: worker connecting xprt %p via %s to "
2211 "%s (port %s)\n", xprt,
2212 xprt->address_strings[RPC_DISPLAY_PROTO],
2213 xprt->address_strings[RPC_DISPLAY_ADDR],
2214 xprt->address_strings[RPC_DISPLAY_PORT]);
2216 xs_udp_finish_connecting(xprt, sock);
2217 trace_rpc_socket_connect(xprt, sock, 0);
2220 xprt_clear_connecting(xprt);
2221 xprt_unlock_connect(xprt, transport);
2222 xprt_wake_pending_tasks(xprt, status);
2226 * xs_tcp_shutdown - gracefully shut down a TCP socket
2229 * Initiates a graceful shutdown of the TCP socket by calling the
2230 * equivalent of shutdown(SHUT_RDWR);
2232 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2234 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2235 struct socket *sock = transport->sock;
2236 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2242 kernel_sock_shutdown(sock, SHUT_RDWR);
2243 trace_rpc_socket_shutdown(xprt, sock);
2247 xs_reset_transport(transport);
2251 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2252 struct socket *sock)
2254 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2255 unsigned int keepidle;
2256 unsigned int keepcnt;
2257 unsigned int opt_on = 1;
2260 spin_lock(&xprt->transport_lock);
2261 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2262 keepcnt = xprt->timeout->to_retries + 1;
2263 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2264 (xprt->timeout->to_retries + 1);
2265 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2266 spin_unlock(&xprt->transport_lock);
2268 /* TCP Keepalive options */
2269 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2270 (char *)&opt_on, sizeof(opt_on));
2271 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2272 (char *)&keepidle, sizeof(keepidle));
2273 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2274 (char *)&keepidle, sizeof(keepidle));
2275 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2276 (char *)&keepcnt, sizeof(keepcnt));
2278 /* TCP user timeout (see RFC5482) */
2279 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
2280 (char *)&timeo, sizeof(timeo));
2283 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2284 unsigned long connect_timeout,
2285 unsigned long reconnect_timeout)
2287 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2288 struct rpc_timeout to;
2289 unsigned long initval;
2291 spin_lock(&xprt->transport_lock);
2292 if (reconnect_timeout < xprt->max_reconnect_timeout)
2293 xprt->max_reconnect_timeout = reconnect_timeout;
2294 if (connect_timeout < xprt->connect_timeout) {
2295 memcpy(&to, xprt->timeout, sizeof(to));
2296 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2297 /* Arbitrary lower limit */
2298 if (initval < XS_TCP_INIT_REEST_TO << 1)
2299 initval = XS_TCP_INIT_REEST_TO << 1;
2300 to.to_initval = initval;
2301 to.to_maxval = initval;
2302 memcpy(&transport->tcp_timeout, &to,
2303 sizeof(transport->tcp_timeout));
2304 xprt->timeout = &transport->tcp_timeout;
2305 xprt->connect_timeout = connect_timeout;
2307 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2308 spin_unlock(&xprt->transport_lock);
2311 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2313 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2314 int ret = -ENOTCONN;
2316 if (!transport->inet) {
2317 struct sock *sk = sock->sk;
2318 unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC;
2320 /* Avoid temporary address, they are bad for long-lived
2321 * connections such as NFS mounts.
2322 * RFC4941, section 3.6 suggests that:
2323 * Individual applications, which have specific
2324 * knowledge about the normal duration of connections,
2325 * MAY override this as appropriate.
2327 kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES,
2328 (char *)&addr_pref, sizeof(addr_pref));
2330 xs_tcp_set_socket_timeouts(xprt, sock);
2332 write_lock_bh(&sk->sk_callback_lock);
2334 xs_save_old_callbacks(transport, sk);
2336 sk->sk_user_data = xprt;
2337 sk->sk_data_ready = xs_data_ready;
2338 sk->sk_state_change = xs_tcp_state_change;
2339 sk->sk_write_space = xs_tcp_write_space;
2340 sock_set_flag(sk, SOCK_FASYNC);
2341 sk->sk_error_report = xs_error_report;
2343 /* socket options */
2344 sock_reset_flag(sk, SOCK_LINGER);
2345 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2347 xprt_clear_connected(xprt);
2349 /* Reset to new socket */
2350 transport->sock = sock;
2351 transport->inet = sk;
2353 write_unlock_bh(&sk->sk_callback_lock);
2356 if (!xprt_bound(xprt))
2359 xs_set_memalloc(xprt);
2361 xs_stream_start_connect(transport);
2363 /* Tell the socket layer to start connecting... */
2364 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2365 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2368 xs_set_srcport(transport, sock);
2372 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2373 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2375 case -EADDRNOTAVAIL:
2376 /* Source port number is unavailable. Try a new one! */
2377 transport->srcport = 0;
2384 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2385 * @work: queued work item
2387 * Invoked by a work queue tasklet.
2389 static void xs_tcp_setup_socket(struct work_struct *work)
2391 struct sock_xprt *transport =
2392 container_of(work, struct sock_xprt, connect_worker.work);
2393 struct socket *sock = transport->sock;
2394 struct rpc_xprt *xprt = &transport->xprt;
2397 if (xprt_connected(xprt))
2399 if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT,
2400 &transport->sock_state) ||
2402 xs_reset_transport(transport);
2403 sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family,
2404 SOCK_STREAM, IPPROTO_TCP, true);
2406 status = PTR_ERR(sock);
2411 dprintk("RPC: worker connecting xprt %p via %s to "
2412 "%s (port %s)\n", xprt,
2413 xprt->address_strings[RPC_DISPLAY_PROTO],
2414 xprt->address_strings[RPC_DISPLAY_ADDR],
2415 xprt->address_strings[RPC_DISPLAY_PORT]);
2417 status = xs_tcp_finish_connecting(xprt, sock);
2418 trace_rpc_socket_connect(xprt, sock, status);
2419 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2420 xprt, -status, xprt_connected(xprt),
2421 sock->sk->sk_state);
2424 printk("%s: connect returned unhandled error %d\n",
2427 case -EADDRNOTAVAIL:
2428 /* We're probably in TIME_WAIT. Get rid of existing socket,
2431 xs_tcp_force_close(xprt);
2435 set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state);
2438 xprt_unlock_connect(xprt, transport);
2441 /* Happens, for instance, if the user specified a link
2442 * local IPv6 address without a scope-id.
2452 * xs_tcp_force_close() wakes tasks with -EIO.
2453 * We need to wake them first to ensure the
2454 * correct error code.
2456 xprt_wake_pending_tasks(xprt, status);
2457 xs_tcp_force_close(xprt);
2462 xprt_clear_connecting(xprt);
2463 xprt_unlock_connect(xprt, transport);
2464 xprt_wake_pending_tasks(xprt, status);
2468 * xs_connect - connect a socket to a remote endpoint
2469 * @xprt: pointer to transport structure
2470 * @task: address of RPC task that manages state of connect request
2472 * TCP: If the remote end dropped the connection, delay reconnecting.
2474 * UDP socket connects are synchronous, but we use a work queue anyway
2475 * to guarantee that even unprivileged user processes can set up a
2476 * socket on a privileged port.
2478 * If a UDP socket connect fails, the delay behavior here prevents
2479 * retry floods (hard mounts).
2481 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2483 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2484 unsigned long delay = 0;
2486 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2488 if (transport->sock != NULL) {
2489 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2490 "seconds\n", xprt, xprt->reestablish_timeout / HZ);
2492 delay = xprt_reconnect_delay(xprt);
2493 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2496 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2498 queue_delayed_work(xprtiod_workqueue,
2499 &transport->connect_worker,
2503 static void xs_wake_disconnect(struct sock_xprt *transport)
2505 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2506 xs_tcp_force_close(&transport->xprt);
2509 static void xs_wake_write(struct sock_xprt *transport)
2511 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2512 xprt_write_space(&transport->xprt);
2515 static void xs_wake_error(struct sock_xprt *transport)
2519 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2521 mutex_lock(&transport->recv_mutex);
2522 if (transport->sock == NULL)
2524 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2526 sockerr = xchg(&transport->xprt_err, 0);
2528 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2530 mutex_unlock(&transport->recv_mutex);
2533 static void xs_wake_pending(struct sock_xprt *transport)
2535 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2536 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2539 static void xs_error_handle(struct work_struct *work)
2541 struct sock_xprt *transport = container_of(work,
2542 struct sock_xprt, error_worker);
2544 xs_wake_disconnect(transport);
2545 xs_wake_write(transport);
2546 xs_wake_error(transport);
2547 xs_wake_pending(transport);
2551 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2552 * @xprt: rpc_xprt struct containing statistics
2556 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2560 if (xprt_connected(xprt))
2561 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2563 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2564 "%llu %llu %lu %llu %llu\n",
2565 xprt->stat.bind_count,
2566 xprt->stat.connect_count,
2567 xprt->stat.connect_time / HZ,
2571 xprt->stat.bad_xids,
2574 xprt->stat.max_slots,
2575 xprt->stat.sending_u,
2576 xprt->stat.pending_u);
2580 * xs_udp_print_stats - display UDP socket-specifc stats
2581 * @xprt: rpc_xprt struct containing statistics
2585 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2587 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2589 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2592 xprt->stat.bind_count,
2595 xprt->stat.bad_xids,
2598 xprt->stat.max_slots,
2599 xprt->stat.sending_u,
2600 xprt->stat.pending_u);
2604 * xs_tcp_print_stats - display TCP socket-specifc stats
2605 * @xprt: rpc_xprt struct containing statistics
2609 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2611 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2614 if (xprt_connected(xprt))
2615 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2617 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2618 "%llu %llu %lu %llu %llu\n",
2620 xprt->stat.bind_count,
2621 xprt->stat.connect_count,
2622 xprt->stat.connect_time / HZ,
2626 xprt->stat.bad_xids,
2629 xprt->stat.max_slots,
2630 xprt->stat.sending_u,
2631 xprt->stat.pending_u);
2635 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2636 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2637 * to use the server side send routines.
2639 static int bc_malloc(struct rpc_task *task)
2641 struct rpc_rqst *rqst = task->tk_rqstp;
2642 size_t size = rqst->rq_callsize;
2644 struct rpc_buffer *buf;
2646 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2647 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2652 page = alloc_page(GFP_KERNEL);
2656 buf = page_address(page);
2657 buf->len = PAGE_SIZE;
2659 rqst->rq_buffer = buf->data;
2660 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2665 * Free the space allocated in the bc_alloc routine
2667 static void bc_free(struct rpc_task *task)
2669 void *buffer = task->tk_rqstp->rq_buffer;
2670 struct rpc_buffer *buf;
2672 buf = container_of(buffer, struct rpc_buffer, data);
2673 free_page((unsigned long)buf);
2677 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2678 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2680 static int bc_sendto(struct rpc_rqst *req)
2683 struct xdr_buf *xbufp = &req->rq_snd_buf;
2684 struct sock_xprt *transport =
2685 container_of(req->rq_xprt, struct sock_xprt, xprt);
2686 unsigned long headoff;
2687 unsigned long tailoff;
2688 struct page *tailpage;
2689 struct msghdr msg = {
2690 .msg_flags = MSG_MORE
2692 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2695 .iov_base = &marker,
2696 .iov_len = sizeof(marker),
2699 req->rq_xtime = ktime_get();
2701 len = kernel_sendmsg(transport->sock, &msg, &iov, 1, iov.iov_len);
2702 if (len != iov.iov_len)
2706 if (xbufp->tail[0].iov_len)
2707 tailpage = virt_to_page(xbufp->tail[0].iov_base);
2708 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2709 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2710 len = svc_send_common(transport->sock, xbufp,
2711 virt_to_page(xbufp->head[0].iov_base), headoff,
2713 if (len != xbufp->len)
2719 * The send routine. Borrows from svc_send
2721 static int bc_send_request(struct rpc_rqst *req)
2723 struct svc_xprt *xprt;
2727 * Get the server socket associated with this callback xprt
2729 xprt = req->rq_xprt->bc_xprt;
2732 * Grab the mutex to serialize data as the connection is shared
2733 * with the fore channel
2735 mutex_lock(&xprt->xpt_mutex);
2736 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2739 len = bc_sendto(req);
2740 mutex_unlock(&xprt->xpt_mutex);
2749 * The close routine. Since this is client initiated, we do nothing
2752 static void bc_close(struct rpc_xprt *xprt)
2754 xprt_disconnect_done(xprt);
2758 * The xprt destroy routine. Again, because this connection is client
2759 * initiated, we do nothing
2762 static void bc_destroy(struct rpc_xprt *xprt)
2764 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2767 module_put(THIS_MODULE);
2770 static const struct rpc_xprt_ops xs_local_ops = {
2771 .reserve_xprt = xprt_reserve_xprt,
2772 .release_xprt = xprt_release_xprt,
2773 .alloc_slot = xprt_alloc_slot,
2774 .free_slot = xprt_free_slot,
2775 .rpcbind = xs_local_rpcbind,
2776 .set_port = xs_local_set_port,
2777 .connect = xs_local_connect,
2778 .buf_alloc = rpc_malloc,
2779 .buf_free = rpc_free,
2780 .prepare_request = xs_stream_prepare_request,
2781 .send_request = xs_local_send_request,
2782 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2784 .destroy = xs_destroy,
2785 .print_stats = xs_local_print_stats,
2786 .enable_swap = xs_enable_swap,
2787 .disable_swap = xs_disable_swap,
2790 static const struct rpc_xprt_ops xs_udp_ops = {
2791 .set_buffer_size = xs_udp_set_buffer_size,
2792 .reserve_xprt = xprt_reserve_xprt_cong,
2793 .release_xprt = xprt_release_xprt_cong,
2794 .alloc_slot = xprt_alloc_slot,
2795 .free_slot = xprt_free_slot,
2796 .rpcbind = rpcb_getport_async,
2797 .set_port = xs_set_port,
2798 .connect = xs_connect,
2799 .buf_alloc = rpc_malloc,
2800 .buf_free = rpc_free,
2801 .send_request = xs_udp_send_request,
2802 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
2803 .timer = xs_udp_timer,
2804 .release_request = xprt_release_rqst_cong,
2806 .destroy = xs_destroy,
2807 .print_stats = xs_udp_print_stats,
2808 .enable_swap = xs_enable_swap,
2809 .disable_swap = xs_disable_swap,
2810 .inject_disconnect = xs_inject_disconnect,
2813 static const struct rpc_xprt_ops xs_tcp_ops = {
2814 .reserve_xprt = xprt_reserve_xprt,
2815 .release_xprt = xprt_release_xprt,
2816 .alloc_slot = xprt_alloc_slot,
2817 .free_slot = xprt_free_slot,
2818 .rpcbind = rpcb_getport_async,
2819 .set_port = xs_set_port,
2820 .connect = xs_connect,
2821 .buf_alloc = rpc_malloc,
2822 .buf_free = rpc_free,
2823 .prepare_request = xs_stream_prepare_request,
2824 .send_request = xs_tcp_send_request,
2825 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2826 .close = xs_tcp_shutdown,
2827 .destroy = xs_destroy,
2828 .set_connect_timeout = xs_tcp_set_connect_timeout,
2829 .print_stats = xs_tcp_print_stats,
2830 .enable_swap = xs_enable_swap,
2831 .disable_swap = xs_disable_swap,
2832 .inject_disconnect = xs_inject_disconnect,
2833 #ifdef CONFIG_SUNRPC_BACKCHANNEL
2834 .bc_setup = xprt_setup_bc,
2835 .bc_maxpayload = xs_tcp_bc_maxpayload,
2836 .bc_num_slots = xprt_bc_max_slots,
2837 .bc_free_rqst = xprt_free_bc_rqst,
2838 .bc_destroy = xprt_destroy_bc,
2843 * The rpc_xprt_ops for the server backchannel
2846 static const struct rpc_xprt_ops bc_tcp_ops = {
2847 .reserve_xprt = xprt_reserve_xprt,
2848 .release_xprt = xprt_release_xprt,
2849 .alloc_slot = xprt_alloc_slot,
2850 .free_slot = xprt_free_slot,
2851 .buf_alloc = bc_malloc,
2852 .buf_free = bc_free,
2853 .send_request = bc_send_request,
2854 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2856 .destroy = bc_destroy,
2857 .print_stats = xs_tcp_print_stats,
2858 .enable_swap = xs_enable_swap,
2859 .disable_swap = xs_disable_swap,
2860 .inject_disconnect = xs_inject_disconnect,
2863 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2865 static const struct sockaddr_in sin = {
2866 .sin_family = AF_INET,
2867 .sin_addr.s_addr = htonl(INADDR_ANY),
2869 static const struct sockaddr_in6 sin6 = {
2870 .sin6_family = AF_INET6,
2871 .sin6_addr = IN6ADDR_ANY_INIT,
2878 memcpy(sap, &sin, sizeof(sin));
2881 memcpy(sap, &sin6, sizeof(sin6));
2884 dprintk("RPC: %s: Bad address family\n", __func__);
2885 return -EAFNOSUPPORT;
2890 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2891 unsigned int slot_table_size,
2892 unsigned int max_slot_table_size)
2894 struct rpc_xprt *xprt;
2895 struct sock_xprt *new;
2897 if (args->addrlen > sizeof(xprt->addr)) {
2898 dprintk("RPC: xs_setup_xprt: address too large\n");
2899 return ERR_PTR(-EBADF);
2902 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2903 max_slot_table_size);
2905 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2907 return ERR_PTR(-ENOMEM);
2910 new = container_of(xprt, struct sock_xprt, xprt);
2911 mutex_init(&new->recv_mutex);
2912 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2913 xprt->addrlen = args->addrlen;
2915 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2918 err = xs_init_anyaddr(args->dstaddr->sa_family,
2919 (struct sockaddr *)&new->srcaddr);
2922 return ERR_PTR(err);
2929 static const struct rpc_timeout xs_local_default_timeout = {
2930 .to_initval = 10 * HZ,
2931 .to_maxval = 10 * HZ,
2936 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2937 * @args: rpc transport creation arguments
2939 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2941 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2943 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2944 struct sock_xprt *transport;
2945 struct rpc_xprt *xprt;
2946 struct rpc_xprt *ret;
2948 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2949 xprt_max_tcp_slot_table_entries);
2952 transport = container_of(xprt, struct sock_xprt, xprt);
2955 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2957 xprt->bind_timeout = XS_BIND_TO;
2958 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2959 xprt->idle_timeout = XS_IDLE_DISC_TO;
2961 xprt->ops = &xs_local_ops;
2962 xprt->timeout = &xs_local_default_timeout;
2964 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2965 INIT_WORK(&transport->error_worker, xs_error_handle);
2966 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
2968 switch (sun->sun_family) {
2970 if (sun->sun_path[0] != '/') {
2971 dprintk("RPC: bad AF_LOCAL address: %s\n",
2973 ret = ERR_PTR(-EINVAL);
2976 xprt_set_bound(xprt);
2977 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2980 ret = ERR_PTR(-EAFNOSUPPORT);
2984 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2985 xprt->address_strings[RPC_DISPLAY_ADDR]);
2987 if (try_module_get(THIS_MODULE))
2989 ret = ERR_PTR(-EINVAL);
2995 static const struct rpc_timeout xs_udp_default_timeout = {
2996 .to_initval = 5 * HZ,
2997 .to_maxval = 30 * HZ,
2998 .to_increment = 5 * HZ,
3003 * xs_setup_udp - Set up transport to use a UDP socket
3004 * @args: rpc transport creation arguments
3007 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
3009 struct sockaddr *addr = args->dstaddr;
3010 struct rpc_xprt *xprt;
3011 struct sock_xprt *transport;
3012 struct rpc_xprt *ret;
3014 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
3015 xprt_udp_slot_table_entries);
3018 transport = container_of(xprt, struct sock_xprt, xprt);
3020 xprt->prot = IPPROTO_UDP;
3021 /* XXX: header size can vary due to auth type, IPv6, etc. */
3022 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
3024 xprt->bind_timeout = XS_BIND_TO;
3025 xprt->reestablish_timeout = XS_UDP_REEST_TO;
3026 xprt->idle_timeout = XS_IDLE_DISC_TO;
3028 xprt->ops = &xs_udp_ops;
3030 xprt->timeout = &xs_udp_default_timeout;
3032 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
3033 INIT_WORK(&transport->error_worker, xs_error_handle);
3034 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
3036 switch (addr->sa_family) {
3038 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3039 xprt_set_bound(xprt);
3041 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
3044 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3045 xprt_set_bound(xprt);
3047 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
3050 ret = ERR_PTR(-EAFNOSUPPORT);
3054 if (xprt_bound(xprt))
3055 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3056 xprt->address_strings[RPC_DISPLAY_ADDR],
3057 xprt->address_strings[RPC_DISPLAY_PORT],
3058 xprt->address_strings[RPC_DISPLAY_PROTO]);
3060 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3061 xprt->address_strings[RPC_DISPLAY_ADDR],
3062 xprt->address_strings[RPC_DISPLAY_PROTO]);
3064 if (try_module_get(THIS_MODULE))
3066 ret = ERR_PTR(-EINVAL);
3072 static const struct rpc_timeout xs_tcp_default_timeout = {
3073 .to_initval = 60 * HZ,
3074 .to_maxval = 60 * HZ,
3079 * xs_setup_tcp - Set up transport to use a TCP socket
3080 * @args: rpc transport creation arguments
3083 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
3085 struct sockaddr *addr = args->dstaddr;
3086 struct rpc_xprt *xprt;
3087 struct sock_xprt *transport;
3088 struct rpc_xprt *ret;
3089 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3091 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3092 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3094 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3095 max_slot_table_size);
3098 transport = container_of(xprt, struct sock_xprt, xprt);
3100 xprt->prot = IPPROTO_TCP;
3101 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3103 xprt->bind_timeout = XS_BIND_TO;
3104 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3105 xprt->idle_timeout = XS_IDLE_DISC_TO;
3107 xprt->ops = &xs_tcp_ops;
3108 xprt->timeout = &xs_tcp_default_timeout;
3110 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3111 xprt->connect_timeout = xprt->timeout->to_initval *
3112 (xprt->timeout->to_retries + 1);
3114 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3115 INIT_WORK(&transport->error_worker, xs_error_handle);
3116 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3118 switch (addr->sa_family) {
3120 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3121 xprt_set_bound(xprt);
3123 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3126 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3127 xprt_set_bound(xprt);
3129 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3132 ret = ERR_PTR(-EAFNOSUPPORT);
3136 if (xprt_bound(xprt))
3137 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3138 xprt->address_strings[RPC_DISPLAY_ADDR],
3139 xprt->address_strings[RPC_DISPLAY_PORT],
3140 xprt->address_strings[RPC_DISPLAY_PROTO]);
3142 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3143 xprt->address_strings[RPC_DISPLAY_ADDR],
3144 xprt->address_strings[RPC_DISPLAY_PROTO]);
3146 if (try_module_get(THIS_MODULE))
3148 ret = ERR_PTR(-EINVAL);
3155 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3156 * @args: rpc transport creation arguments
3159 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3161 struct sockaddr *addr = args->dstaddr;
3162 struct rpc_xprt *xprt;
3163 struct sock_xprt *transport;
3164 struct svc_sock *bc_sock;
3165 struct rpc_xprt *ret;
3167 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3168 xprt_tcp_slot_table_entries);
3171 transport = container_of(xprt, struct sock_xprt, xprt);
3173 xprt->prot = IPPROTO_TCP;
3174 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3175 xprt->timeout = &xs_tcp_default_timeout;
3178 xprt_set_bound(xprt);
3179 xprt->bind_timeout = 0;
3180 xprt->reestablish_timeout = 0;
3181 xprt->idle_timeout = 0;
3183 xprt->ops = &bc_tcp_ops;
3185 switch (addr->sa_family) {
3187 xs_format_peer_addresses(xprt, "tcp",
3191 xs_format_peer_addresses(xprt, "tcp",
3192 RPCBIND_NETID_TCP6);
3195 ret = ERR_PTR(-EAFNOSUPPORT);
3199 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3200 xprt->address_strings[RPC_DISPLAY_ADDR],
3201 xprt->address_strings[RPC_DISPLAY_PORT],
3202 xprt->address_strings[RPC_DISPLAY_PROTO]);
3205 * Once we've associated a backchannel xprt with a connection,
3206 * we want to keep it around as long as the connection lasts,
3207 * in case we need to start using it for a backchannel again;
3208 * this reference won't be dropped until bc_xprt is destroyed.
3211 args->bc_xprt->xpt_bc_xprt = xprt;
3212 xprt->bc_xprt = args->bc_xprt;
3213 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3214 transport->sock = bc_sock->sk_sock;
3215 transport->inet = bc_sock->sk_sk;
3218 * Since we don't want connections for the backchannel, we set
3219 * the xprt status to connected
3221 xprt_set_connected(xprt);
3223 if (try_module_get(THIS_MODULE))
3226 args->bc_xprt->xpt_bc_xprt = NULL;
3227 args->bc_xprt->xpt_bc_xps = NULL;
3229 ret = ERR_PTR(-EINVAL);
3235 static struct xprt_class xs_local_transport = {
3236 .list = LIST_HEAD_INIT(xs_local_transport.list),
3237 .name = "named UNIX socket",
3238 .owner = THIS_MODULE,
3239 .ident = XPRT_TRANSPORT_LOCAL,
3240 .setup = xs_setup_local,
3244 static struct xprt_class xs_udp_transport = {
3245 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3247 .owner = THIS_MODULE,
3248 .ident = XPRT_TRANSPORT_UDP,
3249 .setup = xs_setup_udp,
3250 .netid = { "udp", "udp6", "" },
3253 static struct xprt_class xs_tcp_transport = {
3254 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3256 .owner = THIS_MODULE,
3257 .ident = XPRT_TRANSPORT_TCP,
3258 .setup = xs_setup_tcp,
3259 .netid = { "tcp", "tcp6", "" },
3262 static struct xprt_class xs_bc_tcp_transport = {
3263 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3264 .name = "tcp NFSv4.1 backchannel",
3265 .owner = THIS_MODULE,
3266 .ident = XPRT_TRANSPORT_BC_TCP,
3267 .setup = xs_setup_bc_tcp,
3272 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3275 int init_socket_xprt(void)
3277 if (!sunrpc_table_header)
3278 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3280 xprt_register_transport(&xs_local_transport);
3281 xprt_register_transport(&xs_udp_transport);
3282 xprt_register_transport(&xs_tcp_transport);
3283 xprt_register_transport(&xs_bc_tcp_transport);
3289 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3292 void cleanup_socket_xprt(void)
3294 if (sunrpc_table_header) {
3295 unregister_sysctl_table(sunrpc_table_header);
3296 sunrpc_table_header = NULL;
3299 xprt_unregister_transport(&xs_local_transport);
3300 xprt_unregister_transport(&xs_udp_transport);
3301 xprt_unregister_transport(&xs_tcp_transport);
3302 xprt_unregister_transport(&xs_bc_tcp_transport);
3305 static int param_set_uint_minmax(const char *val,
3306 const struct kernel_param *kp,
3307 unsigned int min, unsigned int max)
3314 ret = kstrtouint(val, 0, &num);
3317 if (num < min || num > max)
3319 *((unsigned int *)kp->arg) = num;
3323 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3325 return param_set_uint_minmax(val, kp,
3330 static const struct kernel_param_ops param_ops_portnr = {
3331 .set = param_set_portnr,
3332 .get = param_get_uint,
3335 #define param_check_portnr(name, p) \
3336 __param_check(name, p, unsigned int);
3338 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3339 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3341 static int param_set_slot_table_size(const char *val,
3342 const struct kernel_param *kp)
3344 return param_set_uint_minmax(val, kp,
3346 RPC_MAX_SLOT_TABLE);
3349 static const struct kernel_param_ops param_ops_slot_table_size = {
3350 .set = param_set_slot_table_size,
3351 .get = param_get_uint,
3354 #define param_check_slot_table_size(name, p) \
3355 __param_check(name, p, unsigned int);
3357 static int param_set_max_slot_table_size(const char *val,
3358 const struct kernel_param *kp)
3360 return param_set_uint_minmax(val, kp,
3362 RPC_MAX_SLOT_TABLE_LIMIT);
3365 static const struct kernel_param_ops param_ops_max_slot_table_size = {
3366 .set = param_set_max_slot_table_size,
3367 .get = param_get_uint,
3370 #define param_check_max_slot_table_size(name, p) \
3371 __param_check(name, p, unsigned int);
3373 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3374 slot_table_size, 0644);
3375 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3376 max_slot_table_size, 0644);
3377 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3378 slot_table_size, 0644);