2 * linux/net/sunrpc/xprtsock.c
4 * Client-side transport implementation for sockets.
6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/pagemap.h>
27 #include <linux/errno.h>
28 #include <linux/socket.h>
30 #include <linux/net.h>
33 #include <linux/udp.h>
34 #include <linux/tcp.h>
35 #include <linux/sunrpc/clnt.h>
36 #include <linux/sunrpc/addr.h>
37 #include <linux/sunrpc/sched.h>
38 #include <linux/sunrpc/svcsock.h>
39 #include <linux/sunrpc/xprtsock.h>
40 #include <linux/file.h>
41 #ifdef CONFIG_SUNRPC_BACKCHANNEL
42 #include <linux/sunrpc/bc_xprt.h>
46 #include <net/checksum.h>
50 #include <trace/events/sunrpc.h>
54 static void xs_close(struct rpc_xprt *xprt);
55 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
61 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
62 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
63 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
65 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
66 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
68 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
70 #define XS_TCP_LINGER_TO (15U * HZ)
71 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
74 * We can register our own files under /proc/sys/sunrpc by
75 * calling register_sysctl_table() again. The files in that
76 * directory become the union of all files registered there.
78 * We simply need to make sure that we don't collide with
79 * someone else's file names!
82 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
83 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
84 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
85 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
86 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
88 static struct ctl_table_header *sunrpc_table_header;
91 * FIXME: changing the UDP slot table size should also resize the UDP
92 * socket buffers for existing UDP transports
94 static struct ctl_table xs_tunables_table[] = {
96 .procname = "udp_slot_table_entries",
97 .data = &xprt_udp_slot_table_entries,
98 .maxlen = sizeof(unsigned int),
100 .proc_handler = proc_dointvec_minmax,
101 .extra1 = &min_slot_table_size,
102 .extra2 = &max_slot_table_size
105 .procname = "tcp_slot_table_entries",
106 .data = &xprt_tcp_slot_table_entries,
107 .maxlen = sizeof(unsigned int),
109 .proc_handler = proc_dointvec_minmax,
110 .extra1 = &min_slot_table_size,
111 .extra2 = &max_slot_table_size
114 .procname = "tcp_max_slot_table_entries",
115 .data = &xprt_max_tcp_slot_table_entries,
116 .maxlen = sizeof(unsigned int),
118 .proc_handler = proc_dointvec_minmax,
119 .extra1 = &min_slot_table_size,
120 .extra2 = &max_tcp_slot_table_limit
123 .procname = "min_resvport",
124 .data = &xprt_min_resvport,
125 .maxlen = sizeof(unsigned int),
127 .proc_handler = proc_dointvec_minmax,
128 .extra1 = &xprt_min_resvport_limit,
129 .extra2 = &xprt_max_resvport
132 .procname = "max_resvport",
133 .data = &xprt_max_resvport,
134 .maxlen = sizeof(unsigned int),
136 .proc_handler = proc_dointvec_minmax,
137 .extra1 = &xprt_min_resvport,
138 .extra2 = &xprt_max_resvport_limit
141 .procname = "tcp_fin_timeout",
142 .data = &xs_tcp_fin_timeout,
143 .maxlen = sizeof(xs_tcp_fin_timeout),
145 .proc_handler = proc_dointvec_jiffies,
150 static struct ctl_table sunrpc_table[] = {
152 .procname = "sunrpc",
154 .child = xs_tunables_table
162 * Wait duration for a reply from the RPC portmapper.
164 #define XS_BIND_TO (60U * HZ)
167 * Delay if a UDP socket connect error occurs. This is most likely some
168 * kind of resource problem on the local host.
170 #define XS_UDP_REEST_TO (2U * HZ)
173 * The reestablish timeout allows clients to delay for a bit before attempting
174 * to reconnect to a server that just dropped our connection.
176 * We implement an exponential backoff when trying to reestablish a TCP
177 * transport connection with the server. Some servers like to drop a TCP
178 * connection when they are overworked, so we start with a short timeout and
179 * increase over time if the server is down or not responding.
181 #define XS_TCP_INIT_REEST_TO (3U * HZ)
184 * TCP idle timeout; client drops the transport socket if it is idle
185 * for this long. Note that we also timeout UDP sockets to prevent
186 * holding port numbers when there is no RPC traffic.
188 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
190 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
191 # undef RPC_DEBUG_DATA
192 # define RPCDBG_FACILITY RPCDBG_TRANS
195 #ifdef RPC_DEBUG_DATA
196 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
198 u8 *buf = (u8 *) packet;
201 dprintk("RPC: %s\n", msg);
202 for (j = 0; j < count && j < 128; j += 4) {
206 dprintk("0x%04x ", j);
208 dprintk("%02x%02x%02x%02x ",
209 buf[j], buf[j+1], buf[j+2], buf[j+3]);
214 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
220 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
222 return (struct rpc_xprt *) sk->sk_user_data;
225 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
227 return (struct sockaddr *) &xprt->addr;
230 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
232 return (struct sockaddr_un *) &xprt->addr;
235 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
237 return (struct sockaddr_in *) &xprt->addr;
240 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
242 return (struct sockaddr_in6 *) &xprt->addr;
245 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
247 struct sockaddr *sap = xs_addr(xprt);
248 struct sockaddr_in6 *sin6;
249 struct sockaddr_in *sin;
250 struct sockaddr_un *sun;
253 switch (sap->sa_family) {
255 sun = xs_addr_un(xprt);
256 strlcpy(buf, sun->sun_path, sizeof(buf));
257 xprt->address_strings[RPC_DISPLAY_ADDR] =
258 kstrdup(buf, GFP_KERNEL);
261 (void)rpc_ntop(sap, buf, sizeof(buf));
262 xprt->address_strings[RPC_DISPLAY_ADDR] =
263 kstrdup(buf, GFP_KERNEL);
264 sin = xs_addr_in(xprt);
265 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
268 (void)rpc_ntop(sap, buf, sizeof(buf));
269 xprt->address_strings[RPC_DISPLAY_ADDR] =
270 kstrdup(buf, GFP_KERNEL);
271 sin6 = xs_addr_in6(xprt);
272 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
278 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
281 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
283 struct sockaddr *sap = xs_addr(xprt);
286 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
287 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
289 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
290 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
293 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
294 const char *protocol,
297 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
298 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
299 xs_format_common_peer_addresses(xprt);
300 xs_format_common_peer_ports(xprt);
303 static void xs_update_peer_port(struct rpc_xprt *xprt)
305 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
306 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
308 xs_format_common_peer_ports(xprt);
311 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
315 for (i = 0; i < RPC_DISPLAY_MAX; i++)
317 case RPC_DISPLAY_PROTO:
318 case RPC_DISPLAY_NETID:
321 kfree(xprt->address_strings[i]);
325 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
327 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
329 struct msghdr msg = {
331 .msg_namelen = addrlen,
332 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
335 .iov_base = vec->iov_base + base,
336 .iov_len = vec->iov_len - base,
339 if (iov.iov_len != 0)
340 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
341 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
344 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
346 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
347 int offset, size_t size, int flags);
349 unsigned int remainder;
352 remainder = xdr->page_len - base;
353 base += xdr->page_base;
354 ppage = xdr->pages + (base >> PAGE_SHIFT);
356 do_sendpage = sock->ops->sendpage;
358 do_sendpage = sock_no_sendpage;
360 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
361 int flags = XS_SENDMSG_FLAGS;
367 flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE;
368 err = do_sendpage(sock, *ppage, base, len, flags);
369 if (remainder == 0 || err != len)
383 * xs_sendpages - write pages directly to a socket
384 * @sock: socket to send on
385 * @addr: UDP only -- address of destination
386 * @addrlen: UDP only -- length of destination address
387 * @xdr: buffer containing this request
388 * @base: starting position in the buffer
389 * @zerocopy: true if it is safe to use sendpage()
390 * @sent_p: return the total number of bytes successfully queued for sending
393 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
395 unsigned int remainder = xdr->len - base;
407 if (base < xdr->head[0].iov_len || addr != NULL) {
408 unsigned int len = xdr->head[0].iov_len - base;
410 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
411 if (remainder == 0 || err != len)
416 base -= xdr->head[0].iov_len;
418 if (base < xdr->page_len) {
419 unsigned int len = xdr->page_len - base;
421 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
423 if (remainder == 0 || sent != len)
427 base -= xdr->page_len;
429 if (base >= xdr->tail[0].iov_len)
431 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
440 static void xs_nospace_callback(struct rpc_task *task)
442 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
444 transport->inet->sk_write_pending--;
448 * xs_nospace - place task on wait queue if transmit was incomplete
449 * @task: task to put to sleep
452 static int xs_nospace(struct rpc_task *task)
454 struct rpc_rqst *req = task->tk_rqstp;
455 struct rpc_xprt *xprt = req->rq_xprt;
456 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
457 struct sock *sk = transport->inet;
460 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
461 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
464 /* Protect against races with write_space */
465 spin_lock_bh(&xprt->transport_lock);
467 /* Don't race with disconnect */
468 if (xprt_connected(xprt)) {
469 /* wait for more buffer space */
470 sk->sk_write_pending++;
471 xprt_wait_for_buffer_space(task, xs_nospace_callback);
475 spin_unlock_bh(&xprt->transport_lock);
477 /* Race breaker in case memory is freed before above code is called */
478 if (ret == -EAGAIN) {
479 struct socket_wq *wq;
482 wq = rcu_dereference(sk->sk_wq);
483 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
486 sk->sk_write_space(sk);
492 * Construct a stream transport record marker in @buf.
494 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
496 u32 reclen = buf->len - sizeof(rpc_fraghdr);
497 rpc_fraghdr *base = buf->head[0].iov_base;
498 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
502 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
503 * @task: RPC task that manages the state of an RPC request
506 * 0: The request has been sent
507 * EAGAIN: The socket was blocked, please call again later to
508 * complete the request
509 * ENOTCONN: Caller needs to invoke connect logic then call again
510 * other: Some other error occured, the request was not sent
512 static int xs_local_send_request(struct rpc_task *task)
514 struct rpc_rqst *req = task->tk_rqstp;
515 struct rpc_xprt *xprt = req->rq_xprt;
516 struct sock_xprt *transport =
517 container_of(xprt, struct sock_xprt, xprt);
518 struct xdr_buf *xdr = &req->rq_snd_buf;
522 xs_encode_stream_record_marker(&req->rq_snd_buf);
524 xs_pktdump("packet data:",
525 req->rq_svec->iov_base, req->rq_svec->iov_len);
527 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
529 dprintk("RPC: %s(%u) = %d\n",
530 __func__, xdr->len - req->rq_bytes_sent, status);
532 if (status == -EAGAIN && sock_writeable(transport->inet))
535 if (likely(sent > 0) || status == 0) {
536 req->rq_bytes_sent += sent;
537 req->rq_xmit_bytes_sent += sent;
538 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
539 req->rq_bytes_sent = 0;
549 status = xs_nospace(task);
552 dprintk("RPC: sendmsg returned unrecognized error %d\n",
563 * xs_udp_send_request - write an RPC request to a UDP socket
564 * @task: address of RPC task that manages the state of an RPC request
567 * 0: The request has been sent
568 * EAGAIN: The socket was blocked, please call again later to
569 * complete the request
570 * ENOTCONN: Caller needs to invoke connect logic then call again
571 * other: Some other error occurred, the request was not sent
573 static int xs_udp_send_request(struct rpc_task *task)
575 struct rpc_rqst *req = task->tk_rqstp;
576 struct rpc_xprt *xprt = req->rq_xprt;
577 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
578 struct xdr_buf *xdr = &req->rq_snd_buf;
582 xs_pktdump("packet data:",
583 req->rq_svec->iov_base,
584 req->rq_svec->iov_len);
586 if (!xprt_bound(xprt))
588 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
589 xdr, req->rq_bytes_sent, true, &sent);
591 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
592 xdr->len - req->rq_bytes_sent, status);
594 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
595 if (status == -EPERM)
598 if (status == -EAGAIN && sock_writeable(transport->inet))
601 if (sent > 0 || status == 0) {
602 req->rq_xmit_bytes_sent += sent;
603 if (sent >= req->rq_slen)
605 /* Still some bytes left; set up for a retry later. */
613 /* Should we call xs_close() here? */
616 status = xs_nospace(task);
623 /* When the server has died, an ICMP port unreachable message
624 * prompts ECONNREFUSED. */
627 dprintk("RPC: sendmsg returned unrecognized error %d\n",
635 * xs_tcp_send_request - write an RPC request to a TCP socket
636 * @task: address of RPC task that manages the state of an RPC request
639 * 0: The request has been sent
640 * EAGAIN: The socket was blocked, please call again later to
641 * complete the request
642 * ENOTCONN: Caller needs to invoke connect logic then call again
643 * other: Some other error occurred, the request was not sent
645 * XXX: In the case of soft timeouts, should we eventually give up
646 * if sendmsg is not able to make progress?
648 static int xs_tcp_send_request(struct rpc_task *task)
650 struct rpc_rqst *req = task->tk_rqstp;
651 struct rpc_xprt *xprt = req->rq_xprt;
652 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
653 struct xdr_buf *xdr = &req->rq_snd_buf;
654 bool zerocopy = true;
655 bool vm_wait = false;
659 xs_encode_stream_record_marker(&req->rq_snd_buf);
661 xs_pktdump("packet data:",
662 req->rq_svec->iov_base,
663 req->rq_svec->iov_len);
664 /* Don't use zero copy if this is a resend. If the RPC call
665 * completes while the socket holds a reference to the pages,
666 * then we may end up resending corrupted data.
668 if (task->tk_flags & RPC_TASK_SENT)
671 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
672 xs_tcp_set_socket_timeouts(xprt, transport->sock);
674 /* Continue transmitting the packet/record. We must be careful
675 * to cope with writespace callbacks arriving _after_ we have
676 * called sendmsg(). */
679 status = xs_sendpages(transport->sock, NULL, 0, xdr,
680 req->rq_bytes_sent, zerocopy, &sent);
682 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
683 xdr->len - req->rq_bytes_sent, status);
685 /* If we've sent the entire packet, immediately
686 * reset the count of bytes sent. */
687 req->rq_bytes_sent += sent;
688 req->rq_xmit_bytes_sent += sent;
689 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
690 req->rq_bytes_sent = 0;
694 WARN_ON_ONCE(sent == 0 && status == 0);
696 if (status == -EAGAIN ) {
698 * Return EAGAIN if we're sure we're hitting the
699 * socket send buffer limits.
701 if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
704 * Did we hit a memory allocation failure?
710 /* Retry, knowing now that we're below the
711 * socket send buffer limit
725 /* Should we call xs_close() here? */
728 status = xs_nospace(task);
738 dprintk("RPC: sendmsg returned unrecognized error %d\n",
746 * xs_tcp_release_xprt - clean up after a tcp transmission
750 * This cleans up if an error causes us to abort the transmission of a request.
751 * In this case, the socket may need to be reset in order to avoid confusing
754 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
756 struct rpc_rqst *req;
758 if (task != xprt->snd_task)
762 req = task->tk_rqstp;
765 if (req->rq_bytes_sent == 0)
767 if (req->rq_bytes_sent == req->rq_snd_buf.len)
769 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
771 xprt_release_xprt(xprt, task);
774 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
776 transport->old_data_ready = sk->sk_data_ready;
777 transport->old_state_change = sk->sk_state_change;
778 transport->old_write_space = sk->sk_write_space;
779 transport->old_error_report = sk->sk_error_report;
782 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
784 sk->sk_data_ready = transport->old_data_ready;
785 sk->sk_state_change = transport->old_state_change;
786 sk->sk_write_space = transport->old_write_space;
787 sk->sk_error_report = transport->old_error_report;
790 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
792 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
794 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
797 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
799 smp_mb__before_atomic();
800 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
801 clear_bit(XPRT_CLOSING, &xprt->state);
802 xs_sock_reset_state_flags(xprt);
803 smp_mb__after_atomic();
806 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
808 xs_sock_reset_connection_flags(xprt);
809 /* Mark transport as closed and wake up all pending tasks */
810 xprt_disconnect_done(xprt);
814 * xs_error_report - callback to handle TCP socket state errors
817 * Note: we don't call sock_error() since there may be a rpc_task
818 * using the socket, and so we don't want to clear sk->sk_err.
820 static void xs_error_report(struct sock *sk)
822 struct rpc_xprt *xprt;
825 read_lock_bh(&sk->sk_callback_lock);
826 if (!(xprt = xprt_from_sock(sk)))
832 /* Is this a reset event? */
833 if (sk->sk_state == TCP_CLOSE)
834 xs_sock_mark_closed(xprt);
835 dprintk("RPC: xs_error_report client %p, error=%d...\n",
837 trace_rpc_socket_error(xprt, sk->sk_socket, err);
838 xprt_wake_pending_tasks(xprt, err);
840 read_unlock_bh(&sk->sk_callback_lock);
843 static void xs_reset_transport(struct sock_xprt *transport)
845 struct socket *sock = transport->sock;
846 struct sock *sk = transport->inet;
847 struct rpc_xprt *xprt = &transport->xprt;
852 if (atomic_read(&transport->xprt.swapper))
853 sk_clear_memalloc(sk);
855 kernel_sock_shutdown(sock, SHUT_RDWR);
857 mutex_lock(&transport->recv_mutex);
858 write_lock_bh(&sk->sk_callback_lock);
859 transport->inet = NULL;
860 transport->sock = NULL;
862 sk->sk_user_data = NULL;
864 xs_restore_old_callbacks(transport, sk);
865 xprt_clear_connected(xprt);
866 write_unlock_bh(&sk->sk_callback_lock);
867 xs_sock_reset_connection_flags(xprt);
868 mutex_unlock(&transport->recv_mutex);
870 trace_rpc_socket_close(xprt, sock);
875 * xs_close - close a socket
878 * This is used when all requests are complete; ie, no DRC state remains
879 * on the server we want to save.
881 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
882 * xs_reset_transport() zeroing the socket from underneath a writer.
884 static void xs_close(struct rpc_xprt *xprt)
886 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
888 dprintk("RPC: xs_close xprt %p\n", xprt);
890 xs_reset_transport(transport);
891 xprt->reestablish_timeout = 0;
893 xprt_disconnect_done(xprt);
896 static void xs_inject_disconnect(struct rpc_xprt *xprt)
898 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
900 xprt_disconnect_done(xprt);
903 static void xs_xprt_free(struct rpc_xprt *xprt)
905 xs_free_peer_addresses(xprt);
910 * xs_destroy - prepare to shutdown a transport
911 * @xprt: doomed transport
914 static void xs_destroy(struct rpc_xprt *xprt)
916 struct sock_xprt *transport = container_of(xprt,
917 struct sock_xprt, xprt);
918 dprintk("RPC: xs_destroy xprt %p\n", xprt);
920 cancel_delayed_work_sync(&transport->connect_worker);
922 cancel_work_sync(&transport->recv_worker);
924 module_put(THIS_MODULE);
927 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
929 struct xdr_skb_reader desc = {
931 .offset = sizeof(rpc_fraghdr),
932 .count = skb->len - sizeof(rpc_fraghdr),
935 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
943 * xs_local_data_read_skb
948 * Currently this assumes we can read the whole reply in a single gulp.
950 static void xs_local_data_read_skb(struct rpc_xprt *xprt,
954 struct rpc_task *task;
955 struct rpc_rqst *rovr;
960 repsize = skb->len - sizeof(rpc_fraghdr);
962 dprintk("RPC: impossible RPC reply size %d\n", repsize);
966 /* Copy the XID from the skb... */
967 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
971 /* Look up and lock the request corresponding to the given XID */
972 spin_lock(&xprt->recv_lock);
973 rovr = xprt_lookup_rqst(xprt, *xp);
977 spin_unlock(&xprt->recv_lock);
978 task = rovr->rq_task;
980 copied = rovr->rq_private_buf.buflen;
981 if (copied > repsize)
984 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
985 dprintk("RPC: sk_buff copy failed\n");
986 spin_lock(&xprt->recv_lock);
990 spin_lock(&xprt->recv_lock);
991 xprt_complete_rqst(task, copied);
993 xprt_unpin_rqst(rovr);
995 spin_unlock(&xprt->recv_lock);
998 static void xs_local_data_receive(struct sock_xprt *transport)
1000 struct sk_buff *skb;
1004 mutex_lock(&transport->recv_mutex);
1005 sk = transport->inet;
1009 skb = skb_recv_datagram(sk, 0, 1, &err);
1011 xs_local_data_read_skb(&transport->xprt, sk, skb);
1012 skb_free_datagram(sk, skb);
1015 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1019 mutex_unlock(&transport->recv_mutex);
1022 static void xs_local_data_receive_workfn(struct work_struct *work)
1024 struct sock_xprt *transport =
1025 container_of(work, struct sock_xprt, recv_worker);
1026 xs_local_data_receive(transport);
1030 * xs_udp_data_read_skb - receive callback for UDP sockets
1036 static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1038 struct sk_buff *skb)
1040 struct rpc_task *task;
1041 struct rpc_rqst *rovr;
1042 int repsize, copied;
1048 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1052 /* Copy the XID from the skb... */
1053 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1057 /* Look up and lock the request corresponding to the given XID */
1058 spin_lock(&xprt->recv_lock);
1059 rovr = xprt_lookup_rqst(xprt, *xp);
1062 xprt_pin_rqst(rovr);
1063 spin_unlock(&xprt->recv_lock);
1064 task = rovr->rq_task;
1066 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1069 /* Suck it into the iovec, verify checksum if not done by hw. */
1070 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1071 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1072 spin_lock(&xprt->recv_lock);
1076 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1078 spin_lock_bh(&xprt->transport_lock);
1079 xprt_adjust_cwnd(xprt, task, copied);
1080 spin_unlock_bh(&xprt->transport_lock);
1081 spin_lock(&xprt->recv_lock);
1082 xprt_complete_rqst(task, copied);
1084 xprt_unpin_rqst(rovr);
1086 spin_unlock(&xprt->recv_lock);
1089 static void xs_udp_data_receive(struct sock_xprt *transport)
1091 struct sk_buff *skb;
1095 mutex_lock(&transport->recv_mutex);
1096 sk = transport->inet;
1100 skb = skb_recv_udp(sk, 0, 1, &err);
1102 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1106 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1110 mutex_unlock(&transport->recv_mutex);
1113 static void xs_udp_data_receive_workfn(struct work_struct *work)
1115 struct sock_xprt *transport =
1116 container_of(work, struct sock_xprt, recv_worker);
1117 xs_udp_data_receive(transport);
1121 * xs_data_ready - "data ready" callback for UDP sockets
1122 * @sk: socket with data to read
1125 static void xs_data_ready(struct sock *sk)
1127 struct rpc_xprt *xprt;
1129 read_lock_bh(&sk->sk_callback_lock);
1130 dprintk("RPC: xs_data_ready...\n");
1131 xprt = xprt_from_sock(sk);
1133 struct sock_xprt *transport = container_of(xprt,
1134 struct sock_xprt, xprt);
1135 transport->old_data_ready(sk);
1136 /* Any data means we had a useful conversation, so
1137 * then we don't need to delay the next reconnect
1139 if (xprt->reestablish_timeout)
1140 xprt->reestablish_timeout = 0;
1141 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1142 queue_work(xprtiod_workqueue, &transport->recv_worker);
1144 read_unlock_bh(&sk->sk_callback_lock);
1148 * Helper function to force a TCP close if the server is sending
1149 * junk and/or it has put us in CLOSE_WAIT
1151 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1153 xprt_force_disconnect(xprt);
1156 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1158 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1162 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1163 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1164 used = xdr_skb_read_bits(desc, p, len);
1165 transport->tcp_offset += used;
1169 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1170 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1171 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1173 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1174 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1176 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1177 transport->tcp_offset = 0;
1179 /* Sanity check of the record length */
1180 if (unlikely(transport->tcp_reclen < 8)) {
1181 dprintk("RPC: invalid TCP record fragment length\n");
1182 xs_tcp_force_close(xprt);
1185 dprintk("RPC: reading TCP record fragment of length %d\n",
1186 transport->tcp_reclen);
1189 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1191 if (transport->tcp_offset == transport->tcp_reclen) {
1192 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1193 transport->tcp_offset = 0;
1194 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1195 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1196 transport->tcp_flags |= TCP_RCV_COPY_XID;
1197 transport->tcp_copied = 0;
1202 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1207 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1208 dprintk("RPC: reading XID (%zu bytes)\n", len);
1209 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1210 used = xdr_skb_read_bits(desc, p, len);
1211 transport->tcp_offset += used;
1214 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1215 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1216 transport->tcp_copied = 4;
1217 dprintk("RPC: reading %s XID %08x\n",
1218 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1220 ntohl(transport->tcp_xid));
1221 xs_tcp_check_fraghdr(transport);
1224 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1225 struct xdr_skb_reader *desc)
1232 * We want transport->tcp_offset to be 8 at the end of this routine
1233 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1234 * When this function is called for the first time,
1235 * transport->tcp_offset is 4 (after having already read the xid).
1237 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1238 len = sizeof(transport->tcp_calldir) - offset;
1239 dprintk("RPC: reading CALL/REPLY flag (%zu bytes)\n", len);
1240 p = ((char *) &transport->tcp_calldir) + offset;
1241 used = xdr_skb_read_bits(desc, p, len);
1242 transport->tcp_offset += used;
1245 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1247 * We don't yet have the XDR buffer, so we will write the calldir
1248 * out after we get the buffer from the 'struct rpc_rqst'
1250 switch (ntohl(transport->tcp_calldir)) {
1252 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1253 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1254 transport->tcp_flags |= TCP_RPC_REPLY;
1257 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1258 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1259 transport->tcp_flags &= ~TCP_RPC_REPLY;
1262 dprintk("RPC: invalid request message type\n");
1263 xs_tcp_force_close(&transport->xprt);
1265 xs_tcp_check_fraghdr(transport);
1268 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1269 struct xdr_skb_reader *desc,
1270 struct rpc_rqst *req)
1272 struct sock_xprt *transport =
1273 container_of(xprt, struct sock_xprt, xprt);
1274 struct xdr_buf *rcvbuf;
1278 rcvbuf = &req->rq_private_buf;
1280 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1282 * Save the RPC direction in the XDR buffer
1284 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1285 &transport->tcp_calldir,
1286 sizeof(transport->tcp_calldir));
1287 transport->tcp_copied += sizeof(transport->tcp_calldir);
1288 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1292 if (len > transport->tcp_reclen - transport->tcp_offset)
1293 desc->count = transport->tcp_reclen - transport->tcp_offset;
1294 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1295 desc, xdr_skb_read_bits);
1298 /* Error when copying to the receive buffer,
1299 * usually because we weren't able to allocate
1300 * additional buffer pages. All we can do now
1301 * is turn off TCP_RCV_COPY_DATA, so the request
1302 * will not receive any additional updates,
1304 * Any remaining data from this record will
1307 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1308 dprintk("RPC: XID %08x truncated request\n",
1309 ntohl(transport->tcp_xid));
1310 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1311 "tcp_offset = %u, tcp_reclen = %u\n",
1312 xprt, transport->tcp_copied,
1313 transport->tcp_offset, transport->tcp_reclen);
1317 transport->tcp_copied += r;
1318 transport->tcp_offset += r;
1319 desc->count = len - r;
1321 dprintk("RPC: XID %08x read %zd bytes\n",
1322 ntohl(transport->tcp_xid), r);
1323 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1324 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1325 transport->tcp_offset, transport->tcp_reclen);
1327 if (transport->tcp_copied == req->rq_private_buf.buflen)
1328 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1329 else if (transport->tcp_offset == transport->tcp_reclen) {
1330 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1331 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1336 * Finds the request corresponding to the RPC xid and invokes the common
1337 * tcp read code to read the data.
1339 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1340 struct xdr_skb_reader *desc)
1342 struct sock_xprt *transport =
1343 container_of(xprt, struct sock_xprt, xprt);
1344 struct rpc_rqst *req;
1346 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1348 /* Find and lock the request corresponding to this xid */
1349 spin_lock(&xprt->recv_lock);
1350 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1352 dprintk("RPC: XID %08x request not found!\n",
1353 ntohl(transport->tcp_xid));
1354 spin_unlock(&xprt->recv_lock);
1358 spin_unlock(&xprt->recv_lock);
1360 xs_tcp_read_common(xprt, desc, req);
1362 spin_lock(&xprt->recv_lock);
1363 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1364 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1365 xprt_unpin_rqst(req);
1366 spin_unlock(&xprt->recv_lock);
1370 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1372 * Obtains an rpc_rqst previously allocated and invokes the common
1373 * tcp read code to read the data. The result is placed in the callback
1375 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1376 * connection and return -1.
1378 static int xs_tcp_read_callback(struct rpc_xprt *xprt,
1379 struct xdr_skb_reader *desc)
1381 struct sock_xprt *transport =
1382 container_of(xprt, struct sock_xprt, xprt);
1383 struct rpc_rqst *req;
1385 /* Look up the request corresponding to the given XID */
1386 req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
1388 printk(KERN_WARNING "Callback slot table overflowed\n");
1389 xprt_force_disconnect(xprt);
1393 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1394 xs_tcp_read_common(xprt, desc, req);
1396 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1397 xprt_complete_bc_request(req, transport->tcp_copied);
1402 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1403 struct xdr_skb_reader *desc)
1405 struct sock_xprt *transport =
1406 container_of(xprt, struct sock_xprt, xprt);
1408 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1409 xs_tcp_read_reply(xprt, desc) :
1410 xs_tcp_read_callback(xprt, desc);
1413 static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net)
1417 ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
1418 SVC_SOCK_ANONYMOUS);
1424 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1429 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1430 struct xdr_skb_reader *desc)
1432 return xs_tcp_read_reply(xprt, desc);
1434 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1437 * Read data off the transport. This can be either an RPC_CALL or an
1438 * RPC_REPLY. Relay the processing to helper functions.
1440 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1441 struct xdr_skb_reader *desc)
1443 struct sock_xprt *transport =
1444 container_of(xprt, struct sock_xprt, xprt);
1446 if (_xs_tcp_read_data(xprt, desc) == 0)
1447 xs_tcp_check_fraghdr(transport);
1450 * The transport_lock protects the request handling.
1451 * There's no need to hold it to update the tcp_flags.
1453 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1457 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1461 len = transport->tcp_reclen - transport->tcp_offset;
1462 if (len > desc->count)
1465 desc->offset += len;
1466 transport->tcp_offset += len;
1467 dprintk("RPC: discarded %zu bytes\n", len);
1468 xs_tcp_check_fraghdr(transport);
1471 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1473 struct rpc_xprt *xprt = rd_desc->arg.data;
1474 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1475 struct xdr_skb_reader desc = {
1481 dprintk("RPC: xs_tcp_data_recv started\n");
1483 trace_xs_tcp_data_recv(transport);
1484 /* Read in a new fragment marker if necessary */
1485 /* Can we ever really expect to get completely empty fragments? */
1486 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1487 xs_tcp_read_fraghdr(xprt, &desc);
1490 /* Read in the xid if necessary */
1491 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1492 xs_tcp_read_xid(transport, &desc);
1495 /* Read in the call/reply flag */
1496 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1497 xs_tcp_read_calldir(transport, &desc);
1500 /* Read in the request data */
1501 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1502 xs_tcp_read_data(xprt, &desc);
1505 /* Skip over any trailing bytes on short reads */
1506 xs_tcp_read_discard(transport, &desc);
1507 } while (desc.count);
1508 trace_xs_tcp_data_recv(transport);
1509 dprintk("RPC: xs_tcp_data_recv done\n");
1510 return len - desc.count;
1513 static void xs_tcp_data_receive(struct sock_xprt *transport)
1515 struct rpc_xprt *xprt = &transport->xprt;
1517 read_descriptor_t rd_desc = {
1518 .count = 2*1024*1024,
1521 unsigned long total = 0;
1525 mutex_lock(&transport->recv_mutex);
1526 sk = transport->inet;
1530 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1531 for (loop = 0; loop < 64; loop++) {
1533 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1535 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1541 rd_desc.count = 65536;
1543 if (test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1544 queue_work(xprtiod_workqueue, &transport->recv_worker);
1546 mutex_unlock(&transport->recv_mutex);
1547 trace_xs_tcp_data_ready(xprt, read, total);
1550 static void xs_tcp_data_receive_workfn(struct work_struct *work)
1552 struct sock_xprt *transport =
1553 container_of(work, struct sock_xprt, recv_worker);
1554 xs_tcp_data_receive(transport);
1558 * xs_tcp_state_change - callback to handle TCP socket state changes
1559 * @sk: socket whose state has changed
1562 static void xs_tcp_state_change(struct sock *sk)
1564 struct rpc_xprt *xprt;
1565 struct sock_xprt *transport;
1567 read_lock_bh(&sk->sk_callback_lock);
1568 if (!(xprt = xprt_from_sock(sk)))
1570 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1571 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1572 sk->sk_state, xprt_connected(xprt),
1573 sock_flag(sk, SOCK_DEAD),
1574 sock_flag(sk, SOCK_ZAPPED),
1577 transport = container_of(xprt, struct sock_xprt, xprt);
1578 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1579 switch (sk->sk_state) {
1580 case TCP_ESTABLISHED:
1581 spin_lock(&xprt->transport_lock);
1582 if (!xprt_test_and_set_connected(xprt)) {
1584 /* Reset TCP record info */
1585 transport->tcp_offset = 0;
1586 transport->tcp_reclen = 0;
1587 transport->tcp_copied = 0;
1588 transport->tcp_flags =
1589 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1590 xprt->connect_cookie++;
1591 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1592 xprt_clear_connecting(xprt);
1594 xprt_wake_pending_tasks(xprt, -EAGAIN);
1596 spin_unlock(&xprt->transport_lock);
1599 /* The client initiated a shutdown of the socket */
1600 xprt->connect_cookie++;
1601 xprt->reestablish_timeout = 0;
1602 set_bit(XPRT_CLOSING, &xprt->state);
1603 smp_mb__before_atomic();
1604 clear_bit(XPRT_CONNECTED, &xprt->state);
1605 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1606 smp_mb__after_atomic();
1608 case TCP_CLOSE_WAIT:
1609 /* The server initiated a shutdown of the socket */
1610 xprt->connect_cookie++;
1611 clear_bit(XPRT_CONNECTED, &xprt->state);
1612 xs_tcp_force_close(xprt);
1615 * If the server closed down the connection, make sure that
1616 * we back off before reconnecting
1618 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1619 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1622 set_bit(XPRT_CLOSING, &xprt->state);
1623 smp_mb__before_atomic();
1624 clear_bit(XPRT_CONNECTED, &xprt->state);
1625 smp_mb__after_atomic();
1628 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1629 &transport->sock_state))
1630 xprt_clear_connecting(xprt);
1632 xprt_wake_pending_tasks(xprt, -sk->sk_err);
1633 xs_sock_mark_closed(xprt);
1636 read_unlock_bh(&sk->sk_callback_lock);
1639 static void xs_write_space(struct sock *sk)
1641 struct socket_wq *wq;
1642 struct rpc_xprt *xprt;
1646 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1648 if (unlikely(!(xprt = xprt_from_sock(sk))))
1651 wq = rcu_dereference(sk->sk_wq);
1652 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1655 xprt_write_space(xprt);
1661 * xs_udp_write_space - callback invoked when socket buffer space
1663 * @sk: socket whose state has changed
1665 * Called when more output buffer space is available for this socket.
1666 * We try not to wake our writers until they can make "significant"
1667 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1668 * with a bunch of small requests.
1670 static void xs_udp_write_space(struct sock *sk)
1672 read_lock_bh(&sk->sk_callback_lock);
1674 /* from net/core/sock.c:sock_def_write_space */
1675 if (sock_writeable(sk))
1678 read_unlock_bh(&sk->sk_callback_lock);
1682 * xs_tcp_write_space - callback invoked when socket buffer space
1684 * @sk: socket whose state has changed
1686 * Called when more output buffer space is available for this socket.
1687 * We try not to wake our writers until they can make "significant"
1688 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1689 * with a bunch of small requests.
1691 static void xs_tcp_write_space(struct sock *sk)
1693 read_lock_bh(&sk->sk_callback_lock);
1695 /* from net/core/stream.c:sk_stream_write_space */
1696 if (sk_stream_is_writeable(sk))
1699 read_unlock_bh(&sk->sk_callback_lock);
1702 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1704 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1705 struct sock *sk = transport->inet;
1707 if (transport->rcvsize) {
1708 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1709 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1711 if (transport->sndsize) {
1712 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1713 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1714 sk->sk_write_space(sk);
1719 * xs_udp_set_buffer_size - set send and receive limits
1720 * @xprt: generic transport
1721 * @sndsize: requested size of send buffer, in bytes
1722 * @rcvsize: requested size of receive buffer, in bytes
1724 * Set socket send and receive buffer size limits.
1726 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1728 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1730 transport->sndsize = 0;
1732 transport->sndsize = sndsize + 1024;
1733 transport->rcvsize = 0;
1735 transport->rcvsize = rcvsize + 1024;
1737 xs_udp_do_set_buffer_size(xprt);
1741 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1742 * @task: task that timed out
1744 * Adjust the congestion window after a retransmit timeout has occurred.
1746 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1748 spin_lock_bh(&xprt->transport_lock);
1749 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1750 spin_unlock_bh(&xprt->transport_lock);
1753 static unsigned short xs_get_random_port(void)
1755 unsigned short range = xprt_max_resvport - xprt_min_resvport + 1;
1756 unsigned short rand = (unsigned short) prandom_u32() % range;
1757 return rand + xprt_min_resvport;
1761 * xs_set_reuseaddr_port - set the socket's port and address reuse options
1764 * Note that this function has to be called on all sockets that share the
1765 * same port, and it must be called before binding.
1767 static void xs_sock_set_reuseport(struct socket *sock)
1771 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
1772 (char *)&opt, sizeof(opt));
1775 static unsigned short xs_sock_getport(struct socket *sock)
1777 struct sockaddr_storage buf;
1779 unsigned short port = 0;
1781 if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0)
1783 switch (buf.ss_family) {
1785 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1788 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1795 * xs_set_port - reset the port number in the remote endpoint address
1796 * @xprt: generic transport
1797 * @port: new port number
1800 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1802 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1804 rpc_set_port(xs_addr(xprt), port);
1805 xs_update_peer_port(xprt);
1808 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1810 if (transport->srcport == 0)
1811 transport->srcport = xs_sock_getport(sock);
1814 static unsigned short xs_get_srcport(struct sock_xprt *transport)
1816 unsigned short port = transport->srcport;
1818 if (port == 0 && transport->xprt.resvport)
1819 port = xs_get_random_port();
1823 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1825 if (transport->srcport != 0)
1826 transport->srcport = 0;
1827 if (!transport->xprt.resvport)
1829 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1830 return xprt_max_resvport;
1833 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1835 struct sockaddr_storage myaddr;
1837 unsigned short port = xs_get_srcport(transport);
1838 unsigned short last;
1841 * If we are asking for any ephemeral port (i.e. port == 0 &&
1842 * transport->xprt.resvport == 0), don't bind. Let the local
1843 * port selection happen implicitly when the socket is used
1844 * (for example at connect time).
1846 * This ensures that we can continue to establish TCP
1847 * connections even when all local ephemeral ports are already
1848 * a part of some TCP connection. This makes no difference
1849 * for UDP sockets, but also doens't harm them.
1851 * If we're asking for any reserved port (i.e. port == 0 &&
1852 * transport->xprt.resvport == 1) xs_get_srcport above will
1853 * ensure that port is non-zero and we will bind as needed.
1858 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1860 rpc_set_port((struct sockaddr *)&myaddr, port);
1861 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1862 transport->xprt.addrlen);
1864 transport->srcport = port;
1868 port = xs_next_srcport(transport, port);
1871 } while (err == -EADDRINUSE && nloop != 2);
1873 if (myaddr.ss_family == AF_INET)
1874 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1875 &((struct sockaddr_in *)&myaddr)->sin_addr,
1876 port, err ? "failed" : "ok", err);
1878 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1879 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1880 port, err ? "failed" : "ok", err);
1885 * We don't support autobind on AF_LOCAL sockets
1887 static void xs_local_rpcbind(struct rpc_task *task)
1889 xprt_set_bound(task->tk_xprt);
1892 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1896 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1897 static struct lock_class_key xs_key[2];
1898 static struct lock_class_key xs_slock_key[2];
1900 static inline void xs_reclassify_socketu(struct socket *sock)
1902 struct sock *sk = sock->sk;
1904 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1905 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1908 static inline void xs_reclassify_socket4(struct socket *sock)
1910 struct sock *sk = sock->sk;
1912 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1913 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1916 static inline void xs_reclassify_socket6(struct socket *sock)
1918 struct sock *sk = sock->sk;
1920 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1921 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1924 static inline void xs_reclassify_socket(int family, struct socket *sock)
1926 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1931 xs_reclassify_socketu(sock);
1934 xs_reclassify_socket4(sock);
1937 xs_reclassify_socket6(sock);
1942 static inline void xs_reclassify_socket(int family, struct socket *sock)
1947 static void xs_dummy_setup_socket(struct work_struct *work)
1951 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1952 struct sock_xprt *transport, int family, int type,
1953 int protocol, bool reuseport)
1955 struct socket *sock;
1958 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1960 dprintk("RPC: can't create %d transport socket (%d).\n",
1964 xs_reclassify_socket(family, sock);
1967 xs_sock_set_reuseport(sock);
1969 err = xs_bind(transport, sock);
1977 return ERR_PTR(err);
1980 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1981 struct socket *sock)
1983 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1986 if (!transport->inet) {
1987 struct sock *sk = sock->sk;
1989 write_lock_bh(&sk->sk_callback_lock);
1991 xs_save_old_callbacks(transport, sk);
1993 sk->sk_user_data = xprt;
1994 sk->sk_data_ready = xs_data_ready;
1995 sk->sk_write_space = xs_udp_write_space;
1996 sock_set_flag(sk, SOCK_FASYNC);
1997 sk->sk_error_report = xs_error_report;
1998 sk->sk_allocation = GFP_NOIO;
2000 xprt_clear_connected(xprt);
2002 /* Reset to new socket */
2003 transport->sock = sock;
2004 transport->inet = sk;
2006 write_unlock_bh(&sk->sk_callback_lock);
2009 /* Tell the socket layer to start connecting... */
2010 xprt->stat.connect_count++;
2011 xprt->stat.connect_start = jiffies;
2012 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
2016 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
2017 * @transport: socket transport to connect
2019 static int xs_local_setup_socket(struct sock_xprt *transport)
2021 struct rpc_xprt *xprt = &transport->xprt;
2022 struct socket *sock;
2025 status = __sock_create(xprt->xprt_net, AF_LOCAL,
2026 SOCK_STREAM, 0, &sock, 1);
2028 dprintk("RPC: can't create AF_LOCAL "
2029 "transport socket (%d).\n", -status);
2032 xs_reclassify_socket(AF_LOCAL, sock);
2034 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
2035 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2037 status = xs_local_finish_connecting(xprt, sock);
2038 trace_rpc_socket_connect(xprt, sock, status);
2041 dprintk("RPC: xprt %p connected to %s\n",
2042 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2043 xprt_set_connected(xprt);
2047 dprintk("RPC: xprt %p: socket %s does not exist\n",
2048 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2051 dprintk("RPC: xprt %p: connection refused for %s\n",
2052 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2055 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2057 xprt->address_strings[RPC_DISPLAY_ADDR]);
2061 xprt_clear_connecting(xprt);
2062 xprt_wake_pending_tasks(xprt, status);
2066 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2068 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2071 if (RPC_IS_ASYNC(task)) {
2073 * We want the AF_LOCAL connect to be resolved in the
2074 * filesystem namespace of the process making the rpc
2075 * call. Thus we connect synchronously.
2077 * If we want to support asynchronous AF_LOCAL calls,
2078 * we'll need to figure out how to pass a namespace to
2081 rpc_exit(task, -ENOTCONN);
2084 ret = xs_local_setup_socket(transport);
2085 if (ret && !RPC_IS_SOFTCONN(task))
2086 msleep_interruptible(15000);
2089 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2091 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
2092 * know that we have exclusive access to the socket), to guard against
2093 * races with xs_reset_transport.
2095 static void xs_set_memalloc(struct rpc_xprt *xprt)
2097 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2101 * If there's no sock, then we have nothing to set. The
2102 * reconnecting process will get it for us.
2104 if (!transport->inet)
2106 if (atomic_read(&xprt->swapper))
2107 sk_set_memalloc(transport->inet);
2111 * xs_enable_swap - Tag this transport as being used for swap.
2112 * @xprt: transport to tag
2114 * Take a reference to this transport on behalf of the rpc_clnt, and
2115 * optionally mark it for swapping if it wasn't already.
2118 xs_enable_swap(struct rpc_xprt *xprt)
2120 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2122 if (atomic_inc_return(&xprt->swapper) != 1)
2124 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2125 return -ERESTARTSYS;
2127 sk_set_memalloc(xs->inet);
2128 xprt_release_xprt(xprt, NULL);
2133 * xs_disable_swap - Untag this transport as being used for swap.
2134 * @xprt: transport to tag
2136 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2137 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2140 xs_disable_swap(struct rpc_xprt *xprt)
2142 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2144 if (!atomic_dec_and_test(&xprt->swapper))
2146 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2149 sk_clear_memalloc(xs->inet);
2150 xprt_release_xprt(xprt, NULL);
2153 static void xs_set_memalloc(struct rpc_xprt *xprt)
2158 xs_enable_swap(struct rpc_xprt *xprt)
2164 xs_disable_swap(struct rpc_xprt *xprt)
2169 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2171 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2173 if (!transport->inet) {
2174 struct sock *sk = sock->sk;
2176 write_lock_bh(&sk->sk_callback_lock);
2178 xs_save_old_callbacks(transport, sk);
2180 sk->sk_user_data = xprt;
2181 sk->sk_data_ready = xs_data_ready;
2182 sk->sk_write_space = xs_udp_write_space;
2183 sock_set_flag(sk, SOCK_FASYNC);
2184 sk->sk_allocation = GFP_NOIO;
2186 xprt_set_connected(xprt);
2188 /* Reset to new socket */
2189 transport->sock = sock;
2190 transport->inet = sk;
2192 xs_set_memalloc(xprt);
2194 write_unlock_bh(&sk->sk_callback_lock);
2196 xs_udp_do_set_buffer_size(xprt);
2198 xprt->stat.connect_start = jiffies;
2201 static void xs_udp_setup_socket(struct work_struct *work)
2203 struct sock_xprt *transport =
2204 container_of(work, struct sock_xprt, connect_worker.work);
2205 struct rpc_xprt *xprt = &transport->xprt;
2206 struct socket *sock;
2209 sock = xs_create_sock(xprt, transport,
2210 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2211 IPPROTO_UDP, false);
2215 dprintk("RPC: worker connecting xprt %p via %s to "
2216 "%s (port %s)\n", xprt,
2217 xprt->address_strings[RPC_DISPLAY_PROTO],
2218 xprt->address_strings[RPC_DISPLAY_ADDR],
2219 xprt->address_strings[RPC_DISPLAY_PORT]);
2221 xs_udp_finish_connecting(xprt, sock);
2222 trace_rpc_socket_connect(xprt, sock, 0);
2225 xprt_unlock_connect(xprt, transport);
2226 xprt_clear_connecting(xprt);
2227 xprt_wake_pending_tasks(xprt, status);
2231 * xs_tcp_shutdown - gracefully shut down a TCP socket
2234 * Initiates a graceful shutdown of the TCP socket by calling the
2235 * equivalent of shutdown(SHUT_RDWR);
2237 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2239 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2240 struct socket *sock = transport->sock;
2244 if (xprt_connected(xprt)) {
2245 kernel_sock_shutdown(sock, SHUT_RDWR);
2246 trace_rpc_socket_shutdown(xprt, sock);
2248 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_bh(&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_bh(&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_bh(&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_bh(&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;
2342 sk->sk_allocation = GFP_NOIO;
2344 /* socket options */
2345 sock_reset_flag(sk, SOCK_LINGER);
2346 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2348 xprt_clear_connected(xprt);
2350 /* Reset to new socket */
2351 transport->sock = sock;
2352 transport->inet = sk;
2354 write_unlock_bh(&sk->sk_callback_lock);
2357 if (!xprt_bound(xprt))
2360 xs_set_memalloc(xprt);
2362 /* Tell the socket layer to start connecting... */
2363 xprt->stat.connect_count++;
2364 xprt->stat.connect_start = jiffies;
2365 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2366 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2369 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
2386 * Invoked by a work queue tasklet.
2388 static void xs_tcp_setup_socket(struct work_struct *work)
2390 struct sock_xprt *transport =
2391 container_of(work, struct sock_xprt, connect_worker.work);
2392 struct socket *sock = transport->sock;
2393 struct rpc_xprt *xprt = &transport->xprt;
2397 sock = xs_create_sock(xprt, transport,
2398 xs_addr(xprt)->sa_family, SOCK_STREAM,
2401 status = PTR_ERR(sock);
2406 dprintk("RPC: worker connecting xprt %p via %s to "
2407 "%s (port %s)\n", xprt,
2408 xprt->address_strings[RPC_DISPLAY_PROTO],
2409 xprt->address_strings[RPC_DISPLAY_ADDR],
2410 xprt->address_strings[RPC_DISPLAY_PORT]);
2412 status = xs_tcp_finish_connecting(xprt, sock);
2413 trace_rpc_socket_connect(xprt, sock, status);
2414 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2415 xprt, -status, xprt_connected(xprt),
2416 sock->sk->sk_state);
2419 printk("%s: connect returned unhandled error %d\n",
2421 case -EADDRNOTAVAIL:
2422 /* We're probably in TIME_WAIT. Get rid of existing socket,
2425 xs_tcp_force_close(xprt);
2430 xprt_unlock_connect(xprt, transport);
2433 /* Happens, for instance, if the user specified a link
2434 * local IPv6 address without a scope-id.
2442 * xs_tcp_force_close() wakes tasks with -EIO.
2443 * We need to wake them first to ensure the
2444 * correct error code.
2446 xprt_wake_pending_tasks(xprt, status);
2447 xs_tcp_force_close(xprt);
2452 xprt_unlock_connect(xprt, transport);
2453 xprt_clear_connecting(xprt);
2454 xprt_wake_pending_tasks(xprt, status);
2457 static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt)
2459 unsigned long start, now = jiffies;
2461 start = xprt->stat.connect_start + xprt->reestablish_timeout;
2462 if (time_after(start, now))
2467 static void xs_reconnect_backoff(struct rpc_xprt *xprt)
2469 xprt->reestablish_timeout <<= 1;
2470 if (xprt->reestablish_timeout > xprt->max_reconnect_timeout)
2471 xprt->reestablish_timeout = xprt->max_reconnect_timeout;
2472 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2473 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2477 * xs_connect - connect a socket to a remote endpoint
2478 * @xprt: pointer to transport structure
2479 * @task: address of RPC task that manages state of connect request
2481 * TCP: If the remote end dropped the connection, delay reconnecting.
2483 * UDP socket connects are synchronous, but we use a work queue anyway
2484 * to guarantee that even unprivileged user processes can set up a
2485 * socket on a privileged port.
2487 * If a UDP socket connect fails, the delay behavior here prevents
2488 * retry floods (hard mounts).
2490 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2492 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2493 unsigned long delay = 0;
2495 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2497 if (transport->sock != NULL) {
2498 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2500 xprt, xprt->reestablish_timeout / HZ);
2502 /* Start by resetting any existing state */
2503 xs_reset_transport(transport);
2505 delay = xs_reconnect_delay(xprt);
2506 xs_reconnect_backoff(xprt);
2509 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2511 queue_delayed_work(xprtiod_workqueue,
2512 &transport->connect_worker,
2517 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2518 * @xprt: rpc_xprt struct containing statistics
2522 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2526 if (xprt_connected(xprt))
2527 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2529 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2530 "%llu %llu %lu %llu %llu\n",
2531 xprt->stat.bind_count,
2532 xprt->stat.connect_count,
2533 xprt->stat.connect_time,
2537 xprt->stat.bad_xids,
2540 xprt->stat.max_slots,
2541 xprt->stat.sending_u,
2542 xprt->stat.pending_u);
2546 * xs_udp_print_stats - display UDP socket-specifc stats
2547 * @xprt: rpc_xprt struct containing statistics
2551 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2553 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2555 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2558 xprt->stat.bind_count,
2561 xprt->stat.bad_xids,
2564 xprt->stat.max_slots,
2565 xprt->stat.sending_u,
2566 xprt->stat.pending_u);
2570 * xs_tcp_print_stats - display TCP socket-specifc stats
2571 * @xprt: rpc_xprt struct containing statistics
2575 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2577 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2580 if (xprt_connected(xprt))
2581 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2583 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2584 "%llu %llu %lu %llu %llu\n",
2586 xprt->stat.bind_count,
2587 xprt->stat.connect_count,
2588 xprt->stat.connect_time,
2592 xprt->stat.bad_xids,
2595 xprt->stat.max_slots,
2596 xprt->stat.sending_u,
2597 xprt->stat.pending_u);
2601 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2602 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2603 * to use the server side send routines.
2605 static int bc_malloc(struct rpc_task *task)
2607 struct rpc_rqst *rqst = task->tk_rqstp;
2608 size_t size = rqst->rq_callsize;
2610 struct rpc_buffer *buf;
2612 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2613 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2618 page = alloc_page(GFP_KERNEL);
2622 buf = page_address(page);
2623 buf->len = PAGE_SIZE;
2625 rqst->rq_buffer = buf->data;
2626 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2631 * Free the space allocated in the bc_alloc routine
2633 static void bc_free(struct rpc_task *task)
2635 void *buffer = task->tk_rqstp->rq_buffer;
2636 struct rpc_buffer *buf;
2638 buf = container_of(buffer, struct rpc_buffer, data);
2639 free_page((unsigned long)buf);
2643 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2644 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2646 static int bc_sendto(struct rpc_rqst *req)
2649 struct xdr_buf *xbufp = &req->rq_snd_buf;
2650 struct rpc_xprt *xprt = req->rq_xprt;
2651 struct sock_xprt *transport =
2652 container_of(xprt, struct sock_xprt, xprt);
2653 struct socket *sock = transport->sock;
2654 unsigned long headoff;
2655 unsigned long tailoff;
2657 xs_encode_stream_record_marker(xbufp);
2659 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2660 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2661 len = svc_send_common(sock, xbufp,
2662 virt_to_page(xbufp->head[0].iov_base), headoff,
2663 xbufp->tail[0].iov_base, tailoff);
2665 if (len != xbufp->len) {
2666 printk(KERN_NOTICE "Error sending entire callback!\n");
2674 * The send routine. Borrows from svc_send
2676 static int bc_send_request(struct rpc_task *task)
2678 struct rpc_rqst *req = task->tk_rqstp;
2679 struct svc_xprt *xprt;
2682 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2684 * Get the server socket associated with this callback xprt
2686 xprt = req->rq_xprt->bc_xprt;
2689 * Grab the mutex to serialize data as the connection is shared
2690 * with the fore channel
2692 if (!mutex_trylock(&xprt->xpt_mutex)) {
2693 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2694 if (!mutex_trylock(&xprt->xpt_mutex))
2696 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2698 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2701 len = bc_sendto(req);
2702 mutex_unlock(&xprt->xpt_mutex);
2711 * The close routine. Since this is client initiated, we do nothing
2714 static void bc_close(struct rpc_xprt *xprt)
2719 * The xprt destroy routine. Again, because this connection is client
2720 * initiated, we do nothing
2723 static void bc_destroy(struct rpc_xprt *xprt)
2725 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2728 module_put(THIS_MODULE);
2731 static const struct rpc_xprt_ops xs_local_ops = {
2732 .reserve_xprt = xprt_reserve_xprt,
2733 .release_xprt = xs_tcp_release_xprt,
2734 .alloc_slot = xprt_alloc_slot,
2735 .rpcbind = xs_local_rpcbind,
2736 .set_port = xs_local_set_port,
2737 .connect = xs_local_connect,
2738 .buf_alloc = rpc_malloc,
2739 .buf_free = rpc_free,
2740 .send_request = xs_local_send_request,
2741 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2743 .destroy = xs_destroy,
2744 .print_stats = xs_local_print_stats,
2745 .enable_swap = xs_enable_swap,
2746 .disable_swap = xs_disable_swap,
2749 static const struct rpc_xprt_ops xs_udp_ops = {
2750 .set_buffer_size = xs_udp_set_buffer_size,
2751 .reserve_xprt = xprt_reserve_xprt_cong,
2752 .release_xprt = xprt_release_xprt_cong,
2753 .alloc_slot = xprt_alloc_slot,
2754 .rpcbind = rpcb_getport_async,
2755 .set_port = xs_set_port,
2756 .connect = xs_connect,
2757 .buf_alloc = rpc_malloc,
2758 .buf_free = rpc_free,
2759 .send_request = xs_udp_send_request,
2760 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2761 .timer = xs_udp_timer,
2762 .release_request = xprt_release_rqst_cong,
2764 .destroy = xs_destroy,
2765 .print_stats = xs_udp_print_stats,
2766 .enable_swap = xs_enable_swap,
2767 .disable_swap = xs_disable_swap,
2768 .inject_disconnect = xs_inject_disconnect,
2771 static const struct rpc_xprt_ops xs_tcp_ops = {
2772 .reserve_xprt = xprt_reserve_xprt,
2773 .release_xprt = xs_tcp_release_xprt,
2774 .alloc_slot = xprt_lock_and_alloc_slot,
2775 .rpcbind = rpcb_getport_async,
2776 .set_port = xs_set_port,
2777 .connect = xs_connect,
2778 .buf_alloc = rpc_malloc,
2779 .buf_free = rpc_free,
2780 .send_request = xs_tcp_send_request,
2781 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2782 .close = xs_tcp_shutdown,
2783 .destroy = xs_destroy,
2784 .set_connect_timeout = xs_tcp_set_connect_timeout,
2785 .print_stats = xs_tcp_print_stats,
2786 .enable_swap = xs_enable_swap,
2787 .disable_swap = xs_disable_swap,
2788 .inject_disconnect = xs_inject_disconnect,
2789 #ifdef CONFIG_SUNRPC_BACKCHANNEL
2790 .bc_setup = xprt_setup_bc,
2791 .bc_up = xs_tcp_bc_up,
2792 .bc_maxpayload = xs_tcp_bc_maxpayload,
2793 .bc_free_rqst = xprt_free_bc_rqst,
2794 .bc_destroy = xprt_destroy_bc,
2799 * The rpc_xprt_ops for the server backchannel
2802 static const struct rpc_xprt_ops bc_tcp_ops = {
2803 .reserve_xprt = xprt_reserve_xprt,
2804 .release_xprt = xprt_release_xprt,
2805 .alloc_slot = xprt_alloc_slot,
2806 .buf_alloc = bc_malloc,
2807 .buf_free = bc_free,
2808 .send_request = bc_send_request,
2809 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2811 .destroy = bc_destroy,
2812 .print_stats = xs_tcp_print_stats,
2813 .enable_swap = xs_enable_swap,
2814 .disable_swap = xs_disable_swap,
2815 .inject_disconnect = xs_inject_disconnect,
2818 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2820 static const struct sockaddr_in sin = {
2821 .sin_family = AF_INET,
2822 .sin_addr.s_addr = htonl(INADDR_ANY),
2824 static const struct sockaddr_in6 sin6 = {
2825 .sin6_family = AF_INET6,
2826 .sin6_addr = IN6ADDR_ANY_INIT,
2833 memcpy(sap, &sin, sizeof(sin));
2836 memcpy(sap, &sin6, sizeof(sin6));
2839 dprintk("RPC: %s: Bad address family\n", __func__);
2840 return -EAFNOSUPPORT;
2845 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2846 unsigned int slot_table_size,
2847 unsigned int max_slot_table_size)
2849 struct rpc_xprt *xprt;
2850 struct sock_xprt *new;
2852 if (args->addrlen > sizeof(xprt->addr)) {
2853 dprintk("RPC: xs_setup_xprt: address too large\n");
2854 return ERR_PTR(-EBADF);
2857 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2858 max_slot_table_size);
2860 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2862 return ERR_PTR(-ENOMEM);
2865 new = container_of(xprt, struct sock_xprt, xprt);
2866 mutex_init(&new->recv_mutex);
2867 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2868 xprt->addrlen = args->addrlen;
2870 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2873 err = xs_init_anyaddr(args->dstaddr->sa_family,
2874 (struct sockaddr *)&new->srcaddr);
2877 return ERR_PTR(err);
2884 static const struct rpc_timeout xs_local_default_timeout = {
2885 .to_initval = 10 * HZ,
2886 .to_maxval = 10 * HZ,
2891 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2892 * @args: rpc transport creation arguments
2894 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2896 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2898 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2899 struct sock_xprt *transport;
2900 struct rpc_xprt *xprt;
2901 struct rpc_xprt *ret;
2903 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2904 xprt_max_tcp_slot_table_entries);
2907 transport = container_of(xprt, struct sock_xprt, xprt);
2910 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2911 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2913 xprt->bind_timeout = XS_BIND_TO;
2914 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2915 xprt->idle_timeout = XS_IDLE_DISC_TO;
2917 xprt->ops = &xs_local_ops;
2918 xprt->timeout = &xs_local_default_timeout;
2920 INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn);
2921 INIT_DELAYED_WORK(&transport->connect_worker,
2922 xs_dummy_setup_socket);
2924 switch (sun->sun_family) {
2926 if (sun->sun_path[0] != '/') {
2927 dprintk("RPC: bad AF_LOCAL address: %s\n",
2929 ret = ERR_PTR(-EINVAL);
2932 xprt_set_bound(xprt);
2933 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2934 ret = ERR_PTR(xs_local_setup_socket(transport));
2939 ret = ERR_PTR(-EAFNOSUPPORT);
2943 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2944 xprt->address_strings[RPC_DISPLAY_ADDR]);
2946 if (try_module_get(THIS_MODULE))
2948 ret = ERR_PTR(-EINVAL);
2954 static const struct rpc_timeout xs_udp_default_timeout = {
2955 .to_initval = 5 * HZ,
2956 .to_maxval = 30 * HZ,
2957 .to_increment = 5 * HZ,
2962 * xs_setup_udp - Set up transport to use a UDP socket
2963 * @args: rpc transport creation arguments
2966 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2968 struct sockaddr *addr = args->dstaddr;
2969 struct rpc_xprt *xprt;
2970 struct sock_xprt *transport;
2971 struct rpc_xprt *ret;
2973 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2974 xprt_udp_slot_table_entries);
2977 transport = container_of(xprt, struct sock_xprt, xprt);
2979 xprt->prot = IPPROTO_UDP;
2981 /* XXX: header size can vary due to auth type, IPv6, etc. */
2982 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2984 xprt->bind_timeout = XS_BIND_TO;
2985 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2986 xprt->idle_timeout = XS_IDLE_DISC_TO;
2988 xprt->ops = &xs_udp_ops;
2990 xprt->timeout = &xs_udp_default_timeout;
2992 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2993 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2995 switch (addr->sa_family) {
2997 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2998 xprt_set_bound(xprt);
3000 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
3003 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3004 xprt_set_bound(xprt);
3006 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
3009 ret = ERR_PTR(-EAFNOSUPPORT);
3013 if (xprt_bound(xprt))
3014 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3015 xprt->address_strings[RPC_DISPLAY_ADDR],
3016 xprt->address_strings[RPC_DISPLAY_PORT],
3017 xprt->address_strings[RPC_DISPLAY_PROTO]);
3019 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3020 xprt->address_strings[RPC_DISPLAY_ADDR],
3021 xprt->address_strings[RPC_DISPLAY_PROTO]);
3023 if (try_module_get(THIS_MODULE))
3025 ret = ERR_PTR(-EINVAL);
3031 static const struct rpc_timeout xs_tcp_default_timeout = {
3032 .to_initval = 60 * HZ,
3033 .to_maxval = 60 * HZ,
3038 * xs_setup_tcp - Set up transport to use a TCP socket
3039 * @args: rpc transport creation arguments
3042 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
3044 struct sockaddr *addr = args->dstaddr;
3045 struct rpc_xprt *xprt;
3046 struct sock_xprt *transport;
3047 struct rpc_xprt *ret;
3048 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3050 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3051 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3053 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3054 max_slot_table_size);
3057 transport = container_of(xprt, struct sock_xprt, xprt);
3059 xprt->prot = IPPROTO_TCP;
3060 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
3061 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3063 xprt->bind_timeout = XS_BIND_TO;
3064 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3065 xprt->idle_timeout = XS_IDLE_DISC_TO;
3067 xprt->ops = &xs_tcp_ops;
3068 xprt->timeout = &xs_tcp_default_timeout;
3070 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3071 xprt->connect_timeout = xprt->timeout->to_initval *
3072 (xprt->timeout->to_retries + 1);
3074 INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn);
3075 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3077 switch (addr->sa_family) {
3079 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3080 xprt_set_bound(xprt);
3082 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3085 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3086 xprt_set_bound(xprt);
3088 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3091 ret = ERR_PTR(-EAFNOSUPPORT);
3095 if (xprt_bound(xprt))
3096 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3097 xprt->address_strings[RPC_DISPLAY_ADDR],
3098 xprt->address_strings[RPC_DISPLAY_PORT],
3099 xprt->address_strings[RPC_DISPLAY_PROTO]);
3101 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3102 xprt->address_strings[RPC_DISPLAY_ADDR],
3103 xprt->address_strings[RPC_DISPLAY_PROTO]);
3105 if (try_module_get(THIS_MODULE))
3107 ret = ERR_PTR(-EINVAL);
3114 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3115 * @args: rpc transport creation arguments
3118 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3120 struct sockaddr *addr = args->dstaddr;
3121 struct rpc_xprt *xprt;
3122 struct sock_xprt *transport;
3123 struct svc_sock *bc_sock;
3124 struct rpc_xprt *ret;
3126 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3127 xprt_tcp_slot_table_entries);
3130 transport = container_of(xprt, struct sock_xprt, xprt);
3132 xprt->prot = IPPROTO_TCP;
3133 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
3134 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3135 xprt->timeout = &xs_tcp_default_timeout;
3138 xprt_set_bound(xprt);
3139 xprt->bind_timeout = 0;
3140 xprt->reestablish_timeout = 0;
3141 xprt->idle_timeout = 0;
3143 xprt->ops = &bc_tcp_ops;
3145 switch (addr->sa_family) {
3147 xs_format_peer_addresses(xprt, "tcp",
3151 xs_format_peer_addresses(xprt, "tcp",
3152 RPCBIND_NETID_TCP6);
3155 ret = ERR_PTR(-EAFNOSUPPORT);
3159 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3160 xprt->address_strings[RPC_DISPLAY_ADDR],
3161 xprt->address_strings[RPC_DISPLAY_PORT],
3162 xprt->address_strings[RPC_DISPLAY_PROTO]);
3165 * Once we've associated a backchannel xprt with a connection,
3166 * we want to keep it around as long as the connection lasts,
3167 * in case we need to start using it for a backchannel again;
3168 * this reference won't be dropped until bc_xprt is destroyed.
3171 args->bc_xprt->xpt_bc_xprt = xprt;
3172 xprt->bc_xprt = args->bc_xprt;
3173 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3174 transport->sock = bc_sock->sk_sock;
3175 transport->inet = bc_sock->sk_sk;
3178 * Since we don't want connections for the backchannel, we set
3179 * the xprt status to connected
3181 xprt_set_connected(xprt);
3183 if (try_module_get(THIS_MODULE))
3186 args->bc_xprt->xpt_bc_xprt = NULL;
3187 args->bc_xprt->xpt_bc_xps = NULL;
3189 ret = ERR_PTR(-EINVAL);
3195 static struct xprt_class xs_local_transport = {
3196 .list = LIST_HEAD_INIT(xs_local_transport.list),
3197 .name = "named UNIX socket",
3198 .owner = THIS_MODULE,
3199 .ident = XPRT_TRANSPORT_LOCAL,
3200 .setup = xs_setup_local,
3203 static struct xprt_class xs_udp_transport = {
3204 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3206 .owner = THIS_MODULE,
3207 .ident = XPRT_TRANSPORT_UDP,
3208 .setup = xs_setup_udp,
3211 static struct xprt_class xs_tcp_transport = {
3212 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3214 .owner = THIS_MODULE,
3215 .ident = XPRT_TRANSPORT_TCP,
3216 .setup = xs_setup_tcp,
3219 static struct xprt_class xs_bc_tcp_transport = {
3220 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3221 .name = "tcp NFSv4.1 backchannel",
3222 .owner = THIS_MODULE,
3223 .ident = XPRT_TRANSPORT_BC_TCP,
3224 .setup = xs_setup_bc_tcp,
3228 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3231 int init_socket_xprt(void)
3233 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3234 if (!sunrpc_table_header)
3235 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3238 xprt_register_transport(&xs_local_transport);
3239 xprt_register_transport(&xs_udp_transport);
3240 xprt_register_transport(&xs_tcp_transport);
3241 xprt_register_transport(&xs_bc_tcp_transport);
3247 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3250 void cleanup_socket_xprt(void)
3252 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3253 if (sunrpc_table_header) {
3254 unregister_sysctl_table(sunrpc_table_header);
3255 sunrpc_table_header = NULL;
3259 xprt_unregister_transport(&xs_local_transport);
3260 xprt_unregister_transport(&xs_udp_transport);
3261 xprt_unregister_transport(&xs_tcp_transport);
3262 xprt_unregister_transport(&xs_bc_tcp_transport);
3265 static int param_set_uint_minmax(const char *val,
3266 const struct kernel_param *kp,
3267 unsigned int min, unsigned int max)
3274 ret = kstrtouint(val, 0, &num);
3277 if (num < min || num > max)
3279 *((unsigned int *)kp->arg) = num;
3283 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3285 if (kp->arg == &xprt_min_resvport)
3286 return param_set_uint_minmax(val, kp,
3289 return param_set_uint_minmax(val, kp,
3294 static const struct kernel_param_ops param_ops_portnr = {
3295 .set = param_set_portnr,
3296 .get = param_get_uint,
3299 #define param_check_portnr(name, p) \
3300 __param_check(name, p, unsigned int);
3302 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3303 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3305 static int param_set_slot_table_size(const char *val,
3306 const struct kernel_param *kp)
3308 return param_set_uint_minmax(val, kp,
3310 RPC_MAX_SLOT_TABLE);
3313 static const struct kernel_param_ops param_ops_slot_table_size = {
3314 .set = param_set_slot_table_size,
3315 .get = param_get_uint,
3318 #define param_check_slot_table_size(name, p) \
3319 __param_check(name, p, unsigned int);
3321 static int param_set_max_slot_table_size(const char *val,
3322 const struct kernel_param *kp)
3324 return param_set_uint_minmax(val, kp,
3326 RPC_MAX_SLOT_TABLE_LIMIT);
3329 static const struct kernel_param_ops param_ops_max_slot_table_size = {
3330 .set = param_set_max_slot_table_size,
3331 .get = param_get_uint,
3334 #define param_check_max_slot_table_size(name, p) \
3335 __param_check(name, p, unsigned int);
3337 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3338 slot_table_size, 0644);
3339 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3340 max_slot_table_size, 0644);
3341 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3342 slot_table_size, 0644);