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/slab.h>
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/pagemap.h>
26 #include <linux/errno.h>
27 #include <linux/socket.h>
29 #include <linux/net.h>
31 #include <linux/udp.h>
32 #include <linux/tcp.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/sched.h>
35 #include <linux/sunrpc/svcsock.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/file.h>
38 #ifdef CONFIG_NFS_V4_1
39 #include <linux/sunrpc/bc_xprt.h>
43 #include <net/checksum.h>
51 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
52 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
54 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
55 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
57 #define XS_TCP_LINGER_TO (15U * HZ)
58 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
61 * We can register our own files under /proc/sys/sunrpc by
62 * calling register_sysctl_table() again. The files in that
63 * directory become the union of all files registered there.
65 * We simply need to make sure that we don't collide with
66 * someone else's file names!
71 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
72 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
73 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
74 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
76 static struct ctl_table_header *sunrpc_table_header;
79 * FIXME: changing the UDP slot table size should also resize the UDP
80 * socket buffers for existing UDP transports
82 static ctl_table xs_tunables_table[] = {
84 .procname = "udp_slot_table_entries",
85 .data = &xprt_udp_slot_table_entries,
86 .maxlen = sizeof(unsigned int),
88 .proc_handler = proc_dointvec_minmax,
89 .extra1 = &min_slot_table_size,
90 .extra2 = &max_slot_table_size
93 .procname = "tcp_slot_table_entries",
94 .data = &xprt_tcp_slot_table_entries,
95 .maxlen = sizeof(unsigned int),
97 .proc_handler = proc_dointvec_minmax,
98 .extra1 = &min_slot_table_size,
99 .extra2 = &max_slot_table_size
102 .procname = "min_resvport",
103 .data = &xprt_min_resvport,
104 .maxlen = sizeof(unsigned int),
106 .proc_handler = proc_dointvec_minmax,
107 .extra1 = &xprt_min_resvport_limit,
108 .extra2 = &xprt_max_resvport_limit
111 .procname = "max_resvport",
112 .data = &xprt_max_resvport,
113 .maxlen = sizeof(unsigned int),
115 .proc_handler = proc_dointvec_minmax,
116 .extra1 = &xprt_min_resvport_limit,
117 .extra2 = &xprt_max_resvport_limit
120 .procname = "tcp_fin_timeout",
121 .data = &xs_tcp_fin_timeout,
122 .maxlen = sizeof(xs_tcp_fin_timeout),
124 .proc_handler = proc_dointvec_jiffies,
129 static ctl_table sunrpc_table[] = {
131 .procname = "sunrpc",
133 .child = xs_tunables_table
141 * Time out for an RPC UDP socket connect. UDP socket connects are
142 * synchronous, but we set a timeout anyway in case of resource
143 * exhaustion on the local host.
145 #define XS_UDP_CONN_TO (5U * HZ)
148 * Wait duration for an RPC TCP connection to be established. Solaris
149 * NFS over TCP uses 60 seconds, for example, which is in line with how
150 * long a server takes to reboot.
152 #define XS_TCP_CONN_TO (60U * HZ)
155 * Wait duration for a reply from the RPC portmapper.
157 #define XS_BIND_TO (60U * HZ)
160 * Delay if a UDP socket connect error occurs. This is most likely some
161 * kind of resource problem on the local host.
163 #define XS_UDP_REEST_TO (2U * HZ)
166 * The reestablish timeout allows clients to delay for a bit before attempting
167 * to reconnect to a server that just dropped our connection.
169 * We implement an exponential backoff when trying to reestablish a TCP
170 * transport connection with the server. Some servers like to drop a TCP
171 * connection when they are overworked, so we start with a short timeout and
172 * increase over time if the server is down or not responding.
174 #define XS_TCP_INIT_REEST_TO (3U * HZ)
175 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
178 * TCP idle timeout; client drops the transport socket if it is idle
179 * for this long. Note that we also timeout UDP sockets to prevent
180 * holding port numbers when there is no RPC traffic.
182 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
185 # undef RPC_DEBUG_DATA
186 # define RPCDBG_FACILITY RPCDBG_TRANS
189 #ifdef RPC_DEBUG_DATA
190 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
192 u8 *buf = (u8 *) packet;
195 dprintk("RPC: %s\n", msg);
196 for (j = 0; j < count && j < 128; j += 4) {
200 dprintk("0x%04x ", j);
202 dprintk("%02x%02x%02x%02x ",
203 buf[j], buf[j+1], buf[j+2], buf[j+3]);
208 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
215 struct rpc_xprt xprt;
220 struct socket * sock;
224 * State of TCP reply receive
232 unsigned long tcp_copied,
236 * Connection of transports
238 struct delayed_work connect_worker;
239 struct sockaddr_storage srcaddr;
240 unsigned short srcport;
243 * UDP socket buffer size parameters
249 * Saved socket callback addresses
251 void (*old_data_ready)(struct sock *, int);
252 void (*old_state_change)(struct sock *);
253 void (*old_write_space)(struct sock *);
254 void (*old_error_report)(struct sock *);
258 * TCP receive state flags
260 #define TCP_RCV_LAST_FRAG (1UL << 0)
261 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
262 #define TCP_RCV_COPY_XID (1UL << 2)
263 #define TCP_RCV_COPY_DATA (1UL << 3)
264 #define TCP_RCV_READ_CALLDIR (1UL << 4)
265 #define TCP_RCV_COPY_CALLDIR (1UL << 5)
270 #define TCP_RPC_REPLY (1UL << 6)
272 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
274 return (struct sockaddr *) &xprt->addr;
277 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
279 return (struct sockaddr_in *) &xprt->addr;
282 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
284 return (struct sockaddr_in6 *) &xprt->addr;
287 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
289 struct sockaddr *sap = xs_addr(xprt);
290 struct sockaddr_in6 *sin6;
291 struct sockaddr_in *sin;
294 (void)rpc_ntop(sap, buf, sizeof(buf));
295 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
297 switch (sap->sa_family) {
299 sin = xs_addr_in(xprt);
300 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
303 sin6 = xs_addr_in6(xprt);
304 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
309 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
312 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
314 struct sockaddr *sap = xs_addr(xprt);
317 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
318 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
320 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
321 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
324 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
325 const char *protocol,
328 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
329 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
330 xs_format_common_peer_addresses(xprt);
331 xs_format_common_peer_ports(xprt);
334 static void xs_update_peer_port(struct rpc_xprt *xprt)
336 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
337 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
339 xs_format_common_peer_ports(xprt);
342 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
346 for (i = 0; i < RPC_DISPLAY_MAX; i++)
348 case RPC_DISPLAY_PROTO:
349 case RPC_DISPLAY_NETID:
352 kfree(xprt->address_strings[i]);
356 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
358 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
360 struct msghdr msg = {
362 .msg_namelen = addrlen,
363 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
366 .iov_base = vec->iov_base + base,
367 .iov_len = vec->iov_len - base,
370 if (iov.iov_len != 0)
371 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
372 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
375 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
378 unsigned int remainder;
381 remainder = xdr->page_len - base;
382 base += xdr->page_base;
383 ppage = xdr->pages + (base >> PAGE_SHIFT);
386 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
387 int flags = XS_SENDMSG_FLAGS;
390 if (remainder != 0 || more)
392 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
393 if (remainder == 0 || err != len)
407 * xs_sendpages - write pages directly to a socket
408 * @sock: socket to send on
409 * @addr: UDP only -- address of destination
410 * @addrlen: UDP only -- length of destination address
411 * @xdr: buffer containing this request
412 * @base: starting position in the buffer
415 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
417 unsigned int remainder = xdr->len - base;
423 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
429 if (base < xdr->head[0].iov_len || addr != NULL) {
430 unsigned int len = xdr->head[0].iov_len - base;
432 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
433 if (remainder == 0 || err != len)
438 base -= xdr->head[0].iov_len;
440 if (base < xdr->page_len) {
441 unsigned int len = xdr->page_len - base;
443 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
444 if (remainder == 0 || err != len)
449 base -= xdr->page_len;
451 if (base >= xdr->tail[0].iov_len)
453 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
462 static void xs_nospace_callback(struct rpc_task *task)
464 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
466 transport->inet->sk_write_pending--;
467 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
471 * xs_nospace - place task on wait queue if transmit was incomplete
472 * @task: task to put to sleep
475 static int xs_nospace(struct rpc_task *task)
477 struct rpc_rqst *req = task->tk_rqstp;
478 struct rpc_xprt *xprt = req->rq_xprt;
479 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
482 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
483 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
486 /* Protect against races with write_space */
487 spin_lock_bh(&xprt->transport_lock);
489 /* Don't race with disconnect */
490 if (xprt_connected(xprt)) {
491 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
494 * Notify TCP that we're limited by the application
497 set_bit(SOCK_NOSPACE, &transport->sock->flags);
498 transport->inet->sk_write_pending++;
499 /* ...and wait for more buffer space */
500 xprt_wait_for_buffer_space(task, xs_nospace_callback);
503 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
507 spin_unlock_bh(&xprt->transport_lock);
512 * xs_udp_send_request - write an RPC request to a UDP socket
513 * @task: address of RPC task that manages the state of an RPC request
516 * 0: The request has been sent
517 * EAGAIN: The socket was blocked, please call again later to
518 * complete the request
519 * ENOTCONN: Caller needs to invoke connect logic then call again
520 * other: Some other error occured, the request was not sent
522 static int xs_udp_send_request(struct rpc_task *task)
524 struct rpc_rqst *req = task->tk_rqstp;
525 struct rpc_xprt *xprt = req->rq_xprt;
526 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
527 struct xdr_buf *xdr = &req->rq_snd_buf;
530 xs_pktdump("packet data:",
531 req->rq_svec->iov_base,
532 req->rq_svec->iov_len);
534 if (!xprt_bound(xprt))
536 status = xs_sendpages(transport->sock,
541 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
542 xdr->len - req->rq_bytes_sent, status);
545 task->tk_bytes_sent += status;
546 if (status >= req->rq_slen)
548 /* Still some bytes left; set up for a retry later. */
551 if (!transport->sock)
557 /* Should we call xs_close() here? */
560 status = xs_nospace(task);
563 dprintk("RPC: sendmsg returned unrecognized error %d\n",
568 /* When the server has died, an ICMP port unreachable message
569 * prompts ECONNREFUSED. */
570 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
577 * xs_tcp_shutdown - gracefully shut down a TCP socket
580 * Initiates a graceful shutdown of the TCP socket by calling the
581 * equivalent of shutdown(SHUT_WR);
583 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
585 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
586 struct socket *sock = transport->sock;
589 kernel_sock_shutdown(sock, SHUT_WR);
592 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
594 u32 reclen = buf->len - sizeof(rpc_fraghdr);
595 rpc_fraghdr *base = buf->head[0].iov_base;
596 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
600 * xs_tcp_send_request - write an RPC request to a TCP socket
601 * @task: address of RPC task that manages the state of an RPC request
604 * 0: The request has been sent
605 * EAGAIN: The socket was blocked, please call again later to
606 * complete the request
607 * ENOTCONN: Caller needs to invoke connect logic then call again
608 * other: Some other error occured, the request was not sent
610 * XXX: In the case of soft timeouts, should we eventually give up
611 * if sendmsg is not able to make progress?
613 static int xs_tcp_send_request(struct rpc_task *task)
615 struct rpc_rqst *req = task->tk_rqstp;
616 struct rpc_xprt *xprt = req->rq_xprt;
617 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
618 struct xdr_buf *xdr = &req->rq_snd_buf;
621 xs_encode_tcp_record_marker(&req->rq_snd_buf);
623 xs_pktdump("packet data:",
624 req->rq_svec->iov_base,
625 req->rq_svec->iov_len);
627 /* Continue transmitting the packet/record. We must be careful
628 * to cope with writespace callbacks arriving _after_ we have
629 * called sendmsg(). */
631 status = xs_sendpages(transport->sock,
632 NULL, 0, xdr, req->rq_bytes_sent);
634 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
635 xdr->len - req->rq_bytes_sent, status);
637 if (unlikely(status < 0))
640 /* If we've sent the entire packet, immediately
641 * reset the count of bytes sent. */
642 req->rq_bytes_sent += status;
643 task->tk_bytes_sent += status;
644 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
645 req->rq_bytes_sent = 0;
654 if (!transport->sock)
660 /* Should we call xs_close() here? */
663 status = xs_nospace(task);
666 dprintk("RPC: sendmsg returned unrecognized error %d\n",
670 xs_tcp_shutdown(xprt);
673 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
680 * xs_tcp_release_xprt - clean up after a tcp transmission
684 * This cleans up if an error causes us to abort the transmission of a request.
685 * In this case, the socket may need to be reset in order to avoid confusing
688 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
690 struct rpc_rqst *req;
692 if (task != xprt->snd_task)
696 req = task->tk_rqstp;
697 if (req->rq_bytes_sent == 0)
699 if (req->rq_bytes_sent == req->rq_snd_buf.len)
701 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
703 xprt_release_xprt(xprt, task);
706 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
708 transport->old_data_ready = sk->sk_data_ready;
709 transport->old_state_change = sk->sk_state_change;
710 transport->old_write_space = sk->sk_write_space;
711 transport->old_error_report = sk->sk_error_report;
714 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
716 sk->sk_data_ready = transport->old_data_ready;
717 sk->sk_state_change = transport->old_state_change;
718 sk->sk_write_space = transport->old_write_space;
719 sk->sk_error_report = transport->old_error_report;
722 static void xs_reset_transport(struct sock_xprt *transport)
724 struct socket *sock = transport->sock;
725 struct sock *sk = transport->inet;
730 write_lock_bh(&sk->sk_callback_lock);
731 transport->inet = NULL;
732 transport->sock = NULL;
734 sk->sk_user_data = NULL;
736 xs_restore_old_callbacks(transport, sk);
737 write_unlock_bh(&sk->sk_callback_lock);
745 * xs_close - close a socket
748 * This is used when all requests are complete; ie, no DRC state remains
749 * on the server we want to save.
751 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
752 * xs_reset_transport() zeroing the socket from underneath a writer.
754 static void xs_close(struct rpc_xprt *xprt)
756 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
758 dprintk("RPC: xs_close xprt %p\n", xprt);
760 xs_reset_transport(transport);
761 xprt->reestablish_timeout = 0;
763 smp_mb__before_clear_bit();
764 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
765 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
766 clear_bit(XPRT_CLOSING, &xprt->state);
767 smp_mb__after_clear_bit();
768 xprt_disconnect_done(xprt);
771 static void xs_tcp_close(struct rpc_xprt *xprt)
773 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
776 xs_tcp_shutdown(xprt);
780 * xs_destroy - prepare to shutdown a transport
781 * @xprt: doomed transport
784 static void xs_destroy(struct rpc_xprt *xprt)
786 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
788 dprintk("RPC: xs_destroy xprt %p\n", xprt);
790 cancel_rearming_delayed_work(&transport->connect_worker);
793 xs_free_peer_addresses(xprt);
796 module_put(THIS_MODULE);
799 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
801 return (struct rpc_xprt *) sk->sk_user_data;
805 * xs_udp_data_ready - "data ready" callback for UDP sockets
806 * @sk: socket with data to read
807 * @len: how much data to read
810 static void xs_udp_data_ready(struct sock *sk, int len)
812 struct rpc_task *task;
813 struct rpc_xprt *xprt;
814 struct rpc_rqst *rovr;
816 int err, repsize, copied;
820 read_lock(&sk->sk_callback_lock);
821 dprintk("RPC: xs_udp_data_ready...\n");
822 if (!(xprt = xprt_from_sock(sk)))
825 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
831 repsize = skb->len - sizeof(struct udphdr);
833 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
837 /* Copy the XID from the skb... */
838 xp = skb_header_pointer(skb, sizeof(struct udphdr),
839 sizeof(_xid), &_xid);
843 /* Look up and lock the request corresponding to the given XID */
844 spin_lock(&xprt->transport_lock);
845 rovr = xprt_lookup_rqst(xprt, *xp);
848 task = rovr->rq_task;
850 if ((copied = rovr->rq_private_buf.buflen) > repsize)
853 /* Suck it into the iovec, verify checksum if not done by hw. */
854 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
855 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
859 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
861 /* Something worked... */
862 dst_confirm(skb_dst(skb));
864 xprt_adjust_cwnd(task, copied);
865 xprt_update_rtt(task);
866 xprt_complete_rqst(task, copied);
869 spin_unlock(&xprt->transport_lock);
871 skb_free_datagram(sk, skb);
873 read_unlock(&sk->sk_callback_lock);
876 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
878 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
882 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
883 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
884 used = xdr_skb_read_bits(desc, p, len);
885 transport->tcp_offset += used;
889 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
890 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
891 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
893 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
894 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
896 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
897 transport->tcp_offset = 0;
899 /* Sanity check of the record length */
900 if (unlikely(transport->tcp_reclen < 8)) {
901 dprintk("RPC: invalid TCP record fragment length\n");
902 xprt_force_disconnect(xprt);
905 dprintk("RPC: reading TCP record fragment of length %d\n",
906 transport->tcp_reclen);
909 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
911 if (transport->tcp_offset == transport->tcp_reclen) {
912 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
913 transport->tcp_offset = 0;
914 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
915 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
916 transport->tcp_flags |= TCP_RCV_COPY_XID;
917 transport->tcp_copied = 0;
922 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
927 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
928 dprintk("RPC: reading XID (%Zu bytes)\n", len);
929 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
930 used = xdr_skb_read_bits(desc, p, len);
931 transport->tcp_offset += used;
934 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
935 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
936 transport->tcp_copied = 4;
937 dprintk("RPC: reading %s XID %08x\n",
938 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
940 ntohl(transport->tcp_xid));
941 xs_tcp_check_fraghdr(transport);
944 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
945 struct xdr_skb_reader *desc)
952 * We want transport->tcp_offset to be 8 at the end of this routine
953 * (4 bytes for the xid and 4 bytes for the call/reply flag).
954 * When this function is called for the first time,
955 * transport->tcp_offset is 4 (after having already read the xid).
957 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
958 len = sizeof(calldir) - offset;
959 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
960 used = xdr_skb_read_bits(desc, &calldir, len);
961 transport->tcp_offset += used;
964 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
965 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
966 transport->tcp_flags |= TCP_RCV_COPY_DATA;
968 * We don't yet have the XDR buffer, so we will write the calldir
969 * out after we get the buffer from the 'struct rpc_rqst'
971 if (ntohl(calldir) == RPC_REPLY)
972 transport->tcp_flags |= TCP_RPC_REPLY;
974 transport->tcp_flags &= ~TCP_RPC_REPLY;
975 dprintk("RPC: reading %s CALL/REPLY flag %08x\n",
976 (transport->tcp_flags & TCP_RPC_REPLY) ?
977 "reply for" : "request with", calldir);
978 xs_tcp_check_fraghdr(transport);
981 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
982 struct xdr_skb_reader *desc,
983 struct rpc_rqst *req)
985 struct sock_xprt *transport =
986 container_of(xprt, struct sock_xprt, xprt);
987 struct xdr_buf *rcvbuf;
991 rcvbuf = &req->rq_private_buf;
993 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
995 * Save the RPC direction in the XDR buffer
997 __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ?
998 htonl(RPC_REPLY) : 0;
1000 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1001 &calldir, sizeof(calldir));
1002 transport->tcp_copied += sizeof(calldir);
1003 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1007 if (len > transport->tcp_reclen - transport->tcp_offset) {
1008 struct xdr_skb_reader my_desc;
1010 len = transport->tcp_reclen - transport->tcp_offset;
1011 memcpy(&my_desc, desc, sizeof(my_desc));
1012 my_desc.count = len;
1013 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1014 &my_desc, xdr_skb_read_bits);
1018 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1019 desc, xdr_skb_read_bits);
1022 transport->tcp_copied += r;
1023 transport->tcp_offset += r;
1026 /* Error when copying to the receive buffer,
1027 * usually because we weren't able to allocate
1028 * additional buffer pages. All we can do now
1029 * is turn off TCP_RCV_COPY_DATA, so the request
1030 * will not receive any additional updates,
1032 * Any remaining data from this record will
1035 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1036 dprintk("RPC: XID %08x truncated request\n",
1037 ntohl(transport->tcp_xid));
1038 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1039 "tcp_offset = %u, tcp_reclen = %u\n",
1040 xprt, transport->tcp_copied,
1041 transport->tcp_offset, transport->tcp_reclen);
1045 dprintk("RPC: XID %08x read %Zd bytes\n",
1046 ntohl(transport->tcp_xid), r);
1047 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1048 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1049 transport->tcp_offset, transport->tcp_reclen);
1051 if (transport->tcp_copied == req->rq_private_buf.buflen)
1052 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1053 else if (transport->tcp_offset == transport->tcp_reclen) {
1054 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1055 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1062 * Finds the request corresponding to the RPC xid and invokes the common
1063 * tcp read code to read the data.
1065 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1066 struct xdr_skb_reader *desc)
1068 struct sock_xprt *transport =
1069 container_of(xprt, struct sock_xprt, xprt);
1070 struct rpc_rqst *req;
1072 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1074 /* Find and lock the request corresponding to this xid */
1075 spin_lock(&xprt->transport_lock);
1076 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1078 dprintk("RPC: XID %08x request not found!\n",
1079 ntohl(transport->tcp_xid));
1080 spin_unlock(&xprt->transport_lock);
1084 xs_tcp_read_common(xprt, desc, req);
1086 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1087 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1089 spin_unlock(&xprt->transport_lock);
1093 #if defined(CONFIG_NFS_V4_1)
1095 * Obtains an rpc_rqst previously allocated and invokes the common
1096 * tcp read code to read the data. The result is placed in the callback
1098 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1099 * connection and return -1.
1101 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1102 struct xdr_skb_reader *desc)
1104 struct sock_xprt *transport =
1105 container_of(xprt, struct sock_xprt, xprt);
1106 struct rpc_rqst *req;
1108 req = xprt_alloc_bc_request(xprt);
1110 printk(KERN_WARNING "Callback slot table overflowed\n");
1111 xprt_force_disconnect(xprt);
1115 req->rq_xid = transport->tcp_xid;
1116 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1117 xs_tcp_read_common(xprt, desc, req);
1119 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1120 struct svc_serv *bc_serv = xprt->bc_serv;
1123 * Add callback request to callback list. The callback
1124 * service sleeps on the sv_cb_waitq waiting for new
1125 * requests. Wake it up after adding enqueing the
1128 dprintk("RPC: add callback request to list\n");
1129 spin_lock(&bc_serv->sv_cb_lock);
1130 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1131 spin_unlock(&bc_serv->sv_cb_lock);
1132 wake_up(&bc_serv->sv_cb_waitq);
1135 req->rq_private_buf.len = transport->tcp_copied;
1140 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1141 struct xdr_skb_reader *desc)
1143 struct sock_xprt *transport =
1144 container_of(xprt, struct sock_xprt, xprt);
1146 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1147 xs_tcp_read_reply(xprt, desc) :
1148 xs_tcp_read_callback(xprt, desc);
1151 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1152 struct xdr_skb_reader *desc)
1154 return xs_tcp_read_reply(xprt, desc);
1156 #endif /* CONFIG_NFS_V4_1 */
1159 * Read data off the transport. This can be either an RPC_CALL or an
1160 * RPC_REPLY. Relay the processing to helper functions.
1162 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1163 struct xdr_skb_reader *desc)
1165 struct sock_xprt *transport =
1166 container_of(xprt, struct sock_xprt, xprt);
1168 if (_xs_tcp_read_data(xprt, desc) == 0)
1169 xs_tcp_check_fraghdr(transport);
1172 * The transport_lock protects the request handling.
1173 * There's no need to hold it to update the tcp_flags.
1175 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1179 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1183 len = transport->tcp_reclen - transport->tcp_offset;
1184 if (len > desc->count)
1187 desc->offset += len;
1188 transport->tcp_offset += len;
1189 dprintk("RPC: discarded %Zu bytes\n", len);
1190 xs_tcp_check_fraghdr(transport);
1193 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1195 struct rpc_xprt *xprt = rd_desc->arg.data;
1196 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1197 struct xdr_skb_reader desc = {
1203 dprintk("RPC: xs_tcp_data_recv started\n");
1205 /* Read in a new fragment marker if necessary */
1206 /* Can we ever really expect to get completely empty fragments? */
1207 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1208 xs_tcp_read_fraghdr(xprt, &desc);
1211 /* Read in the xid if necessary */
1212 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1213 xs_tcp_read_xid(transport, &desc);
1216 /* Read in the call/reply flag */
1217 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1218 xs_tcp_read_calldir(transport, &desc);
1221 /* Read in the request data */
1222 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1223 xs_tcp_read_data(xprt, &desc);
1226 /* Skip over any trailing bytes on short reads */
1227 xs_tcp_read_discard(transport, &desc);
1228 } while (desc.count);
1229 dprintk("RPC: xs_tcp_data_recv done\n");
1230 return len - desc.count;
1234 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1235 * @sk: socket with data to read
1236 * @bytes: how much data to read
1239 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1241 struct rpc_xprt *xprt;
1242 read_descriptor_t rd_desc;
1245 dprintk("RPC: xs_tcp_data_ready...\n");
1247 read_lock(&sk->sk_callback_lock);
1248 if (!(xprt = xprt_from_sock(sk)))
1253 /* Any data means we had a useful conversation, so
1254 * the we don't need to delay the next reconnect
1256 if (xprt->reestablish_timeout)
1257 xprt->reestablish_timeout = 0;
1259 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1260 rd_desc.arg.data = xprt;
1262 rd_desc.count = 65536;
1263 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1266 read_unlock(&sk->sk_callback_lock);
1270 * Do the equivalent of linger/linger2 handling for dealing with
1271 * broken servers that don't close the socket in a timely
1274 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1275 unsigned long timeout)
1277 struct sock_xprt *transport;
1279 if (xprt_test_and_set_connecting(xprt))
1281 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1282 transport = container_of(xprt, struct sock_xprt, xprt);
1283 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1287 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1289 struct sock_xprt *transport;
1291 transport = container_of(xprt, struct sock_xprt, xprt);
1293 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1294 !cancel_delayed_work(&transport->connect_worker))
1296 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1297 xprt_clear_connecting(xprt);
1300 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1302 smp_mb__before_clear_bit();
1303 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1304 clear_bit(XPRT_CLOSING, &xprt->state);
1305 smp_mb__after_clear_bit();
1306 /* Mark transport as closed and wake up all pending tasks */
1307 xprt_disconnect_done(xprt);
1311 * xs_tcp_state_change - callback to handle TCP socket state changes
1312 * @sk: socket whose state has changed
1315 static void xs_tcp_state_change(struct sock *sk)
1317 struct rpc_xprt *xprt;
1319 read_lock(&sk->sk_callback_lock);
1320 if (!(xprt = xprt_from_sock(sk)))
1322 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1323 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1324 sk->sk_state, xprt_connected(xprt),
1325 sock_flag(sk, SOCK_DEAD),
1326 sock_flag(sk, SOCK_ZAPPED));
1328 switch (sk->sk_state) {
1329 case TCP_ESTABLISHED:
1330 spin_lock_bh(&xprt->transport_lock);
1331 if (!xprt_test_and_set_connected(xprt)) {
1332 struct sock_xprt *transport = container_of(xprt,
1333 struct sock_xprt, xprt);
1335 /* Reset TCP record info */
1336 transport->tcp_offset = 0;
1337 transport->tcp_reclen = 0;
1338 transport->tcp_copied = 0;
1339 transport->tcp_flags =
1340 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1342 xprt_wake_pending_tasks(xprt, -EAGAIN);
1344 spin_unlock_bh(&xprt->transport_lock);
1347 /* The client initiated a shutdown of the socket */
1348 xprt->connect_cookie++;
1349 xprt->reestablish_timeout = 0;
1350 set_bit(XPRT_CLOSING, &xprt->state);
1351 smp_mb__before_clear_bit();
1352 clear_bit(XPRT_CONNECTED, &xprt->state);
1353 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1354 smp_mb__after_clear_bit();
1355 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1357 case TCP_CLOSE_WAIT:
1358 /* The server initiated a shutdown of the socket */
1359 xprt_force_disconnect(xprt);
1361 xprt->connect_cookie++;
1364 * If the server closed down the connection, make sure that
1365 * we back off before reconnecting
1367 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1368 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1371 set_bit(XPRT_CLOSING, &xprt->state);
1372 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1373 smp_mb__before_clear_bit();
1374 clear_bit(XPRT_CONNECTED, &xprt->state);
1375 smp_mb__after_clear_bit();
1378 xs_tcp_cancel_linger_timeout(xprt);
1379 xs_sock_mark_closed(xprt);
1382 read_unlock(&sk->sk_callback_lock);
1386 * xs_error_report - callback mainly for catching socket errors
1389 static void xs_error_report(struct sock *sk)
1391 struct rpc_xprt *xprt;
1393 read_lock(&sk->sk_callback_lock);
1394 if (!(xprt = xprt_from_sock(sk)))
1396 dprintk("RPC: %s client %p...\n"
1398 __func__, xprt, sk->sk_err);
1399 xprt_wake_pending_tasks(xprt, -EAGAIN);
1401 read_unlock(&sk->sk_callback_lock);
1404 static void xs_write_space(struct sock *sk)
1406 struct socket *sock;
1407 struct rpc_xprt *xprt;
1409 if (unlikely(!(sock = sk->sk_socket)))
1411 clear_bit(SOCK_NOSPACE, &sock->flags);
1413 if (unlikely(!(xprt = xprt_from_sock(sk))))
1415 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1418 xprt_write_space(xprt);
1422 * xs_udp_write_space - callback invoked when socket buffer space
1424 * @sk: socket whose state has changed
1426 * Called when more output buffer space is available for this socket.
1427 * We try not to wake our writers until they can make "significant"
1428 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1429 * with a bunch of small requests.
1431 static void xs_udp_write_space(struct sock *sk)
1433 read_lock(&sk->sk_callback_lock);
1435 /* from net/core/sock.c:sock_def_write_space */
1436 if (sock_writeable(sk))
1439 read_unlock(&sk->sk_callback_lock);
1443 * xs_tcp_write_space - callback invoked when socket buffer space
1445 * @sk: socket whose state has changed
1447 * Called when more output buffer space is available for this socket.
1448 * We try not to wake our writers until they can make "significant"
1449 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1450 * with a bunch of small requests.
1452 static void xs_tcp_write_space(struct sock *sk)
1454 read_lock(&sk->sk_callback_lock);
1456 /* from net/core/stream.c:sk_stream_write_space */
1457 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1460 read_unlock(&sk->sk_callback_lock);
1463 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1465 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1466 struct sock *sk = transport->inet;
1468 if (transport->rcvsize) {
1469 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1470 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1472 if (transport->sndsize) {
1473 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1474 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1475 sk->sk_write_space(sk);
1480 * xs_udp_set_buffer_size - set send and receive limits
1481 * @xprt: generic transport
1482 * @sndsize: requested size of send buffer, in bytes
1483 * @rcvsize: requested size of receive buffer, in bytes
1485 * Set socket send and receive buffer size limits.
1487 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1489 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1491 transport->sndsize = 0;
1493 transport->sndsize = sndsize + 1024;
1494 transport->rcvsize = 0;
1496 transport->rcvsize = rcvsize + 1024;
1498 xs_udp_do_set_buffer_size(xprt);
1502 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1503 * @task: task that timed out
1505 * Adjust the congestion window after a retransmit timeout has occurred.
1507 static void xs_udp_timer(struct rpc_task *task)
1509 xprt_adjust_cwnd(task, -ETIMEDOUT);
1512 static unsigned short xs_get_random_port(void)
1514 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1515 unsigned short rand = (unsigned short) net_random() % range;
1516 return rand + xprt_min_resvport;
1520 * xs_set_port - reset the port number in the remote endpoint address
1521 * @xprt: generic transport
1522 * @port: new port number
1525 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1527 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1529 rpc_set_port(xs_addr(xprt), port);
1530 xs_update_peer_port(xprt);
1533 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1535 unsigned short port = transport->srcport;
1537 if (port == 0 && transport->xprt.resvport)
1538 port = xs_get_random_port();
1542 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1544 if (transport->srcport != 0)
1545 transport->srcport = 0;
1546 if (!transport->xprt.resvport)
1548 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1549 return xprt_max_resvport;
1553 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1555 struct sockaddr_in myaddr = {
1556 .sin_family = AF_INET,
1558 struct sockaddr_in *sa;
1560 unsigned short port = xs_get_srcport(transport, sock);
1561 unsigned short last;
1563 sa = (struct sockaddr_in *)&transport->srcaddr;
1564 myaddr.sin_addr = sa->sin_addr;
1566 myaddr.sin_port = htons(port);
1567 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1572 transport->srcport = port;
1576 port = xs_next_srcport(transport, sock, port);
1579 } while (err == -EADDRINUSE && nloop != 2);
1580 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1581 __func__, &myaddr.sin_addr,
1582 port, err ? "failed" : "ok", err);
1586 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1588 struct sockaddr_in6 myaddr = {
1589 .sin6_family = AF_INET6,
1591 struct sockaddr_in6 *sa;
1593 unsigned short port = xs_get_srcport(transport, sock);
1594 unsigned short last;
1596 sa = (struct sockaddr_in6 *)&transport->srcaddr;
1597 myaddr.sin6_addr = sa->sin6_addr;
1599 myaddr.sin6_port = htons(port);
1600 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1605 transport->srcport = port;
1609 port = xs_next_srcport(transport, sock, port);
1612 } while (err == -EADDRINUSE && nloop != 2);
1613 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1614 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1618 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1619 static struct lock_class_key xs_key[2];
1620 static struct lock_class_key xs_slock_key[2];
1622 static inline void xs_reclassify_socket4(struct socket *sock)
1624 struct sock *sk = sock->sk;
1626 BUG_ON(sock_owned_by_user(sk));
1627 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1628 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1631 static inline void xs_reclassify_socket6(struct socket *sock)
1633 struct sock *sk = sock->sk;
1635 BUG_ON(sock_owned_by_user(sk));
1636 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1637 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1640 static inline void xs_reclassify_socket4(struct socket *sock)
1644 static inline void xs_reclassify_socket6(struct socket *sock)
1649 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1651 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1653 if (!transport->inet) {
1654 struct sock *sk = sock->sk;
1656 write_lock_bh(&sk->sk_callback_lock);
1658 xs_save_old_callbacks(transport, sk);
1660 sk->sk_user_data = xprt;
1661 sk->sk_data_ready = xs_udp_data_ready;
1662 sk->sk_write_space = xs_udp_write_space;
1663 sk->sk_error_report = xs_error_report;
1664 sk->sk_no_check = UDP_CSUM_NORCV;
1665 sk->sk_allocation = GFP_ATOMIC;
1667 xprt_set_connected(xprt);
1669 /* Reset to new socket */
1670 transport->sock = sock;
1671 transport->inet = sk;
1673 write_unlock_bh(&sk->sk_callback_lock);
1675 xs_udp_do_set_buffer_size(xprt);
1679 * xs_udp_connect_worker4 - set up a UDP socket
1680 * @work: RPC transport to connect
1682 * Invoked by a work queue tasklet.
1684 static void xs_udp_connect_worker4(struct work_struct *work)
1686 struct sock_xprt *transport =
1687 container_of(work, struct sock_xprt, connect_worker.work);
1688 struct rpc_xprt *xprt = &transport->xprt;
1689 struct socket *sock = transport->sock;
1690 int err, status = -EIO;
1695 /* Start by resetting any existing state */
1696 xs_reset_transport(transport);
1698 err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1700 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1703 xs_reclassify_socket4(sock);
1705 if (xs_bind4(transport, sock)) {
1710 dprintk("RPC: worker connecting xprt %p via %s to "
1711 "%s (port %s)\n", xprt,
1712 xprt->address_strings[RPC_DISPLAY_PROTO],
1713 xprt->address_strings[RPC_DISPLAY_ADDR],
1714 xprt->address_strings[RPC_DISPLAY_PORT]);
1716 xs_udp_finish_connecting(xprt, sock);
1719 xprt_clear_connecting(xprt);
1720 xprt_wake_pending_tasks(xprt, status);
1724 * xs_udp_connect_worker6 - set up a UDP socket
1725 * @work: RPC transport to connect
1727 * Invoked by a work queue tasklet.
1729 static void xs_udp_connect_worker6(struct work_struct *work)
1731 struct sock_xprt *transport =
1732 container_of(work, struct sock_xprt, connect_worker.work);
1733 struct rpc_xprt *xprt = &transport->xprt;
1734 struct socket *sock = transport->sock;
1735 int err, status = -EIO;
1740 /* Start by resetting any existing state */
1741 xs_reset_transport(transport);
1743 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
1745 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1748 xs_reclassify_socket6(sock);
1750 if (xs_bind6(transport, sock) < 0) {
1755 dprintk("RPC: worker connecting xprt %p via %s to "
1756 "%s (port %s)\n", xprt,
1757 xprt->address_strings[RPC_DISPLAY_PROTO],
1758 xprt->address_strings[RPC_DISPLAY_ADDR],
1759 xprt->address_strings[RPC_DISPLAY_PORT]);
1761 xs_udp_finish_connecting(xprt, sock);
1764 xprt_clear_connecting(xprt);
1765 xprt_wake_pending_tasks(xprt, status);
1769 * We need to preserve the port number so the reply cache on the server can
1770 * find our cached RPC replies when we get around to reconnecting.
1772 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1775 struct sockaddr any;
1777 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1780 * Disconnect the transport socket by doing a connect operation
1781 * with AF_UNSPEC. This should return immediately...
1783 memset(&any, 0, sizeof(any));
1784 any.sa_family = AF_UNSPEC;
1785 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1787 xs_sock_mark_closed(xprt);
1789 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1793 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1795 unsigned int state = transport->inet->sk_state;
1797 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED)
1799 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT))
1801 xs_abort_connection(xprt, transport);
1804 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1806 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1808 if (!transport->inet) {
1809 struct sock *sk = sock->sk;
1811 write_lock_bh(&sk->sk_callback_lock);
1813 xs_save_old_callbacks(transport, sk);
1815 sk->sk_user_data = xprt;
1816 sk->sk_data_ready = xs_tcp_data_ready;
1817 sk->sk_state_change = xs_tcp_state_change;
1818 sk->sk_write_space = xs_tcp_write_space;
1819 sk->sk_error_report = xs_error_report;
1820 sk->sk_allocation = GFP_ATOMIC;
1822 /* socket options */
1823 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1824 sock_reset_flag(sk, SOCK_LINGER);
1825 tcp_sk(sk)->linger2 = 0;
1826 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1828 xprt_clear_connected(xprt);
1830 /* Reset to new socket */
1831 transport->sock = sock;
1832 transport->inet = sk;
1834 write_unlock_bh(&sk->sk_callback_lock);
1837 if (!xprt_bound(xprt))
1840 /* Tell the socket layer to start connecting... */
1841 xprt->stat.connect_count++;
1842 xprt->stat.connect_start = jiffies;
1843 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1847 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
1848 * @xprt: RPC transport to connect
1849 * @transport: socket transport to connect
1850 * @create_sock: function to create a socket of the correct type
1852 * Invoked by a work queue tasklet.
1854 static void xs_tcp_setup_socket(struct rpc_xprt *xprt,
1855 struct sock_xprt *transport,
1856 struct socket *(*create_sock)(struct rpc_xprt *,
1857 struct sock_xprt *))
1859 struct socket *sock = transport->sock;
1866 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1867 sock = create_sock(xprt, transport);
1869 status = PTR_ERR(sock);
1875 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
1877 /* "close" the socket, preserving the local port */
1878 xs_tcp_reuse_connection(xprt, transport);
1884 dprintk("RPC: worker connecting xprt %p via %s to "
1885 "%s (port %s)\n", xprt,
1886 xprt->address_strings[RPC_DISPLAY_PROTO],
1887 xprt->address_strings[RPC_DISPLAY_ADDR],
1888 xprt->address_strings[RPC_DISPLAY_PORT]);
1890 status = xs_tcp_finish_connecting(xprt, sock);
1891 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1892 xprt, -status, xprt_connected(xprt),
1893 sock->sk->sk_state);
1896 printk("%s: connect returned unhandled error %d\n",
1898 case -EADDRNOTAVAIL:
1899 /* We're probably in TIME_WAIT. Get rid of existing socket,
1902 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1903 xprt_force_disconnect(xprt);
1908 /* retry with existing socket, after a delay */
1912 xprt_clear_connecting(xprt);
1915 /* Happens, for instance, if the user specified a link
1916 * local IPv6 address without a scope-id.
1923 xprt_clear_connecting(xprt);
1924 xprt_wake_pending_tasks(xprt, status);
1927 static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt,
1928 struct sock_xprt *transport)
1930 struct socket *sock;
1933 /* start from scratch */
1934 err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1936 dprintk("RPC: can't create TCP transport socket (%d).\n",
1940 xs_reclassify_socket4(sock);
1942 if (xs_bind4(transport, sock) < 0) {
1948 return ERR_PTR(-EIO);
1952 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1953 * @work: RPC transport to connect
1955 * Invoked by a work queue tasklet.
1957 static void xs_tcp_connect_worker4(struct work_struct *work)
1959 struct sock_xprt *transport =
1960 container_of(work, struct sock_xprt, connect_worker.work);
1961 struct rpc_xprt *xprt = &transport->xprt;
1963 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4);
1966 static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt,
1967 struct sock_xprt *transport)
1969 struct socket *sock;
1972 /* start from scratch */
1973 err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock);
1975 dprintk("RPC: can't create TCP transport socket (%d).\n",
1979 xs_reclassify_socket6(sock);
1981 if (xs_bind6(transport, sock) < 0) {
1987 return ERR_PTR(-EIO);
1991 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1992 * @work: RPC transport to connect
1994 * Invoked by a work queue tasklet.
1996 static void xs_tcp_connect_worker6(struct work_struct *work)
1998 struct sock_xprt *transport =
1999 container_of(work, struct sock_xprt, connect_worker.work);
2000 struct rpc_xprt *xprt = &transport->xprt;
2002 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6);
2006 * xs_connect - connect a socket to a remote endpoint
2007 * @task: address of RPC task that manages state of connect request
2009 * TCP: If the remote end dropped the connection, delay reconnecting.
2011 * UDP socket connects are synchronous, but we use a work queue anyway
2012 * to guarantee that even unprivileged user processes can set up a
2013 * socket on a privileged port.
2015 * If a UDP socket connect fails, the delay behavior here prevents
2016 * retry floods (hard mounts).
2018 static void xs_connect(struct rpc_task *task)
2020 struct rpc_xprt *xprt = task->tk_xprt;
2021 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2023 if (xprt_test_and_set_connecting(xprt))
2026 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2027 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2029 xprt, xprt->reestablish_timeout / HZ);
2030 queue_delayed_work(rpciod_workqueue,
2031 &transport->connect_worker,
2032 xprt->reestablish_timeout);
2033 xprt->reestablish_timeout <<= 1;
2034 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2035 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2036 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2037 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2039 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2040 queue_delayed_work(rpciod_workqueue,
2041 &transport->connect_worker, 0);
2045 static void xs_tcp_connect(struct rpc_task *task)
2047 struct rpc_xprt *xprt = task->tk_xprt;
2049 /* Exit if we need to wait for socket shutdown to complete */
2050 if (test_bit(XPRT_CLOSING, &xprt->state))
2056 * xs_udp_print_stats - display UDP socket-specifc stats
2057 * @xprt: rpc_xprt struct containing statistics
2061 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2063 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2065 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
2067 xprt->stat.bind_count,
2070 xprt->stat.bad_xids,
2072 xprt->stat.bklog_u);
2076 * xs_tcp_print_stats - display TCP socket-specifc stats
2077 * @xprt: rpc_xprt struct containing statistics
2081 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2083 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2086 if (xprt_connected(xprt))
2087 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2089 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
2091 xprt->stat.bind_count,
2092 xprt->stat.connect_count,
2093 xprt->stat.connect_time,
2097 xprt->stat.bad_xids,
2099 xprt->stat.bklog_u);
2103 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2104 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2105 * to use the server side send routines.
2107 static void *bc_malloc(struct rpc_task *task, size_t size)
2110 struct rpc_buffer *buf;
2112 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2113 page = alloc_page(GFP_KERNEL);
2118 buf = page_address(page);
2119 buf->len = PAGE_SIZE;
2125 * Free the space allocated in the bc_alloc routine
2127 static void bc_free(void *buffer)
2129 struct rpc_buffer *buf;
2134 buf = container_of(buffer, struct rpc_buffer, data);
2135 free_page((unsigned long)buf);
2139 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2140 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2142 static int bc_sendto(struct rpc_rqst *req)
2145 struct xdr_buf *xbufp = &req->rq_snd_buf;
2146 struct rpc_xprt *xprt = req->rq_xprt;
2147 struct sock_xprt *transport =
2148 container_of(xprt, struct sock_xprt, xprt);
2149 struct socket *sock = transport->sock;
2150 unsigned long headoff;
2151 unsigned long tailoff;
2154 * Set up the rpc header and record marker stuff
2156 xs_encode_tcp_record_marker(xbufp);
2158 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2159 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2160 len = svc_send_common(sock, xbufp,
2161 virt_to_page(xbufp->head[0].iov_base), headoff,
2162 xbufp->tail[0].iov_base, tailoff);
2164 if (len != xbufp->len) {
2165 printk(KERN_NOTICE "Error sending entire callback!\n");
2173 * The send routine. Borrows from svc_send
2175 static int bc_send_request(struct rpc_task *task)
2177 struct rpc_rqst *req = task->tk_rqstp;
2178 struct svc_xprt *xprt;
2179 struct svc_sock *svsk;
2182 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2184 * Get the server socket associated with this callback xprt
2186 xprt = req->rq_xprt->bc_xprt;
2187 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2190 * Grab the mutex to serialize data as the connection is shared
2191 * with the fore channel
2193 if (!mutex_trylock(&xprt->xpt_mutex)) {
2194 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2195 if (!mutex_trylock(&xprt->xpt_mutex))
2197 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2199 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2202 len = bc_sendto(req);
2203 mutex_unlock(&xprt->xpt_mutex);
2212 * The close routine. Since this is client initiated, we do nothing
2215 static void bc_close(struct rpc_xprt *xprt)
2221 * The xprt destroy routine. Again, because this connection is client
2222 * initiated, we do nothing
2225 static void bc_destroy(struct rpc_xprt *xprt)
2230 static struct rpc_xprt_ops xs_udp_ops = {
2231 .set_buffer_size = xs_udp_set_buffer_size,
2232 .reserve_xprt = xprt_reserve_xprt_cong,
2233 .release_xprt = xprt_release_xprt_cong,
2234 .rpcbind = rpcb_getport_async,
2235 .set_port = xs_set_port,
2236 .connect = xs_connect,
2237 .buf_alloc = rpc_malloc,
2238 .buf_free = rpc_free,
2239 .send_request = xs_udp_send_request,
2240 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2241 .timer = xs_udp_timer,
2242 .release_request = xprt_release_rqst_cong,
2244 .destroy = xs_destroy,
2245 .print_stats = xs_udp_print_stats,
2248 static struct rpc_xprt_ops xs_tcp_ops = {
2249 .reserve_xprt = xprt_reserve_xprt,
2250 .release_xprt = xs_tcp_release_xprt,
2251 .rpcbind = rpcb_getport_async,
2252 .set_port = xs_set_port,
2253 .connect = xs_tcp_connect,
2254 .buf_alloc = rpc_malloc,
2255 .buf_free = rpc_free,
2256 .send_request = xs_tcp_send_request,
2257 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2258 #if defined(CONFIG_NFS_V4_1)
2259 .release_request = bc_release_request,
2260 #endif /* CONFIG_NFS_V4_1 */
2261 .close = xs_tcp_close,
2262 .destroy = xs_destroy,
2263 .print_stats = xs_tcp_print_stats,
2267 * The rpc_xprt_ops for the server backchannel
2270 static struct rpc_xprt_ops bc_tcp_ops = {
2271 .reserve_xprt = xprt_reserve_xprt,
2272 .release_xprt = xprt_release_xprt,
2273 .buf_alloc = bc_malloc,
2274 .buf_free = bc_free,
2275 .send_request = bc_send_request,
2276 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2278 .destroy = bc_destroy,
2279 .print_stats = xs_tcp_print_stats,
2282 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2283 unsigned int slot_table_size)
2285 struct rpc_xprt *xprt;
2286 struct sock_xprt *new;
2288 if (args->addrlen > sizeof(xprt->addr)) {
2289 dprintk("RPC: xs_setup_xprt: address too large\n");
2290 return ERR_PTR(-EBADF);
2293 new = kzalloc(sizeof(*new), GFP_KERNEL);
2295 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2297 return ERR_PTR(-ENOMEM);
2301 xprt->max_reqs = slot_table_size;
2302 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
2303 if (xprt->slot == NULL) {
2305 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
2307 return ERR_PTR(-ENOMEM);
2310 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2311 xprt->addrlen = args->addrlen;
2313 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2318 static const struct rpc_timeout xs_udp_default_timeout = {
2319 .to_initval = 5 * HZ,
2320 .to_maxval = 30 * HZ,
2321 .to_increment = 5 * HZ,
2326 * xs_setup_udp - Set up transport to use a UDP socket
2327 * @args: rpc transport creation arguments
2330 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2332 struct sockaddr *addr = args->dstaddr;
2333 struct rpc_xprt *xprt;
2334 struct sock_xprt *transport;
2336 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
2339 transport = container_of(xprt, struct sock_xprt, xprt);
2341 xprt->prot = IPPROTO_UDP;
2343 /* XXX: header size can vary due to auth type, IPv6, etc. */
2344 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2346 xprt->bind_timeout = XS_BIND_TO;
2347 xprt->connect_timeout = XS_UDP_CONN_TO;
2348 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2349 xprt->idle_timeout = XS_IDLE_DISC_TO;
2351 xprt->ops = &xs_udp_ops;
2353 xprt->timeout = &xs_udp_default_timeout;
2355 switch (addr->sa_family) {
2357 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2358 xprt_set_bound(xprt);
2360 INIT_DELAYED_WORK(&transport->connect_worker,
2361 xs_udp_connect_worker4);
2362 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2365 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2366 xprt_set_bound(xprt);
2368 INIT_DELAYED_WORK(&transport->connect_worker,
2369 xs_udp_connect_worker6);
2370 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2374 return ERR_PTR(-EAFNOSUPPORT);
2377 if (xprt_bound(xprt))
2378 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2379 xprt->address_strings[RPC_DISPLAY_ADDR],
2380 xprt->address_strings[RPC_DISPLAY_PORT],
2381 xprt->address_strings[RPC_DISPLAY_PROTO]);
2383 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2384 xprt->address_strings[RPC_DISPLAY_ADDR],
2385 xprt->address_strings[RPC_DISPLAY_PROTO]);
2387 if (try_module_get(THIS_MODULE))
2392 return ERR_PTR(-EINVAL);
2395 static const struct rpc_timeout xs_tcp_default_timeout = {
2396 .to_initval = 60 * HZ,
2397 .to_maxval = 60 * HZ,
2402 * xs_setup_tcp - Set up transport to use a TCP socket
2403 * @args: rpc transport creation arguments
2406 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2408 struct sockaddr *addr = args->dstaddr;
2409 struct rpc_xprt *xprt;
2410 struct sock_xprt *transport;
2412 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2415 transport = container_of(xprt, struct sock_xprt, xprt);
2417 xprt->prot = IPPROTO_TCP;
2418 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2419 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2421 xprt->bind_timeout = XS_BIND_TO;
2422 xprt->connect_timeout = XS_TCP_CONN_TO;
2423 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2424 xprt->idle_timeout = XS_IDLE_DISC_TO;
2426 xprt->ops = &xs_tcp_ops;
2427 xprt->timeout = &xs_tcp_default_timeout;
2429 switch (addr->sa_family) {
2431 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2432 xprt_set_bound(xprt);
2434 INIT_DELAYED_WORK(&transport->connect_worker,
2435 xs_tcp_connect_worker4);
2436 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2439 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2440 xprt_set_bound(xprt);
2442 INIT_DELAYED_WORK(&transport->connect_worker,
2443 xs_tcp_connect_worker6);
2444 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2448 return ERR_PTR(-EAFNOSUPPORT);
2451 if (xprt_bound(xprt))
2452 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2453 xprt->address_strings[RPC_DISPLAY_ADDR],
2454 xprt->address_strings[RPC_DISPLAY_PORT],
2455 xprt->address_strings[RPC_DISPLAY_PROTO]);
2457 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2458 xprt->address_strings[RPC_DISPLAY_ADDR],
2459 xprt->address_strings[RPC_DISPLAY_PROTO]);
2462 if (try_module_get(THIS_MODULE))
2467 return ERR_PTR(-EINVAL);
2471 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2472 * @args: rpc transport creation arguments
2475 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2477 struct sockaddr *addr = args->dstaddr;
2478 struct rpc_xprt *xprt;
2479 struct sock_xprt *transport;
2480 struct svc_sock *bc_sock;
2485 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2488 transport = container_of(xprt, struct sock_xprt, xprt);
2490 xprt->prot = IPPROTO_TCP;
2491 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2492 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2493 xprt->timeout = &xs_tcp_default_timeout;
2496 xprt_set_bound(xprt);
2497 xprt->bind_timeout = 0;
2498 xprt->connect_timeout = 0;
2499 xprt->reestablish_timeout = 0;
2500 xprt->idle_timeout = 0;
2503 * The backchannel uses the same socket connection as the
2506 xprt->bc_xprt = args->bc_xprt;
2507 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2508 bc_sock->sk_bc_xprt = xprt;
2509 transport->sock = bc_sock->sk_sock;
2510 transport->inet = bc_sock->sk_sk;
2512 xprt->ops = &bc_tcp_ops;
2514 switch (addr->sa_family) {
2516 xs_format_peer_addresses(xprt, "tcp",
2520 xs_format_peer_addresses(xprt, "tcp",
2521 RPCBIND_NETID_TCP6);
2525 return ERR_PTR(-EAFNOSUPPORT);
2528 if (xprt_bound(xprt))
2529 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2530 xprt->address_strings[RPC_DISPLAY_ADDR],
2531 xprt->address_strings[RPC_DISPLAY_PORT],
2532 xprt->address_strings[RPC_DISPLAY_PROTO]);
2534 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2535 xprt->address_strings[RPC_DISPLAY_ADDR],
2536 xprt->address_strings[RPC_DISPLAY_PROTO]);
2539 * Since we don't want connections for the backchannel, we set
2540 * the xprt status to connected
2542 xprt_set_connected(xprt);
2545 if (try_module_get(THIS_MODULE))
2549 return ERR_PTR(-EINVAL);
2552 static struct xprt_class xs_udp_transport = {
2553 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2555 .owner = THIS_MODULE,
2556 .ident = XPRT_TRANSPORT_UDP,
2557 .setup = xs_setup_udp,
2560 static struct xprt_class xs_tcp_transport = {
2561 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2563 .owner = THIS_MODULE,
2564 .ident = XPRT_TRANSPORT_TCP,
2565 .setup = xs_setup_tcp,
2568 static struct xprt_class xs_bc_tcp_transport = {
2569 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2570 .name = "tcp NFSv4.1 backchannel",
2571 .owner = THIS_MODULE,
2572 .ident = XPRT_TRANSPORT_BC_TCP,
2573 .setup = xs_setup_bc_tcp,
2577 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2580 int init_socket_xprt(void)
2583 if (!sunrpc_table_header)
2584 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2587 xprt_register_transport(&xs_udp_transport);
2588 xprt_register_transport(&xs_tcp_transport);
2589 xprt_register_transport(&xs_bc_tcp_transport);
2595 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2598 void cleanup_socket_xprt(void)
2601 if (sunrpc_table_header) {
2602 unregister_sysctl_table(sunrpc_table_header);
2603 sunrpc_table_header = NULL;
2607 xprt_unregister_transport(&xs_udp_transport);
2608 xprt_unregister_transport(&xs_tcp_transport);
2609 xprt_unregister_transport(&xs_bc_tcp_transport);
2612 static int param_set_uint_minmax(const char *val, struct kernel_param *kp,
2613 unsigned int min, unsigned int max)
2620 ret = strict_strtoul(val, 0, &num);
2621 if (ret == -EINVAL || num < min || num > max)
2623 *((unsigned int *)kp->arg) = num;
2627 static int param_set_portnr(const char *val, struct kernel_param *kp)
2629 return param_set_uint_minmax(val, kp,
2634 static int param_get_portnr(char *buffer, struct kernel_param *kp)
2636 return param_get_uint(buffer, kp);
2638 #define param_check_portnr(name, p) \
2639 __param_check(name, p, unsigned int);
2641 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2642 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2644 static int param_set_slot_table_size(const char *val, struct kernel_param *kp)
2646 return param_set_uint_minmax(val, kp,
2648 RPC_MAX_SLOT_TABLE);
2651 static int param_get_slot_table_size(char *buffer, struct kernel_param *kp)
2653 return param_get_uint(buffer, kp);
2655 #define param_check_slot_table_size(name, p) \
2656 __param_check(name, p, unsigned int);
2658 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
2659 slot_table_size, 0644);
2660 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
2661 slot_table_size, 0644);