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 (void)snprintf(buf, sizeof(buf), "%02x%02x%02x%02x",
301 NIPQUAD(sin->sin_addr.s_addr));
304 sin6 = xs_addr_in6(xprt);
305 (void)snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
310 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
313 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
315 struct sockaddr *sap = xs_addr(xprt);
318 (void)snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
319 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
321 (void)snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
322 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
325 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
326 const char *protocol,
329 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
330 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
331 xs_format_common_peer_addresses(xprt);
332 xs_format_common_peer_ports(xprt);
335 static void xs_update_peer_port(struct rpc_xprt *xprt)
337 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
338 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
340 xs_format_common_peer_ports(xprt);
343 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
347 for (i = 0; i < RPC_DISPLAY_MAX; i++)
349 case RPC_DISPLAY_PROTO:
350 case RPC_DISPLAY_NETID:
353 kfree(xprt->address_strings[i]);
357 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
359 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
361 struct msghdr msg = {
363 .msg_namelen = addrlen,
364 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
367 .iov_base = vec->iov_base + base,
368 .iov_len = vec->iov_len - base,
371 if (iov.iov_len != 0)
372 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
373 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
376 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
379 unsigned int remainder;
382 remainder = xdr->page_len - base;
383 base += xdr->page_base;
384 ppage = xdr->pages + (base >> PAGE_SHIFT);
387 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
388 int flags = XS_SENDMSG_FLAGS;
391 if (remainder != 0 || more)
393 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
394 if (remainder == 0 || err != len)
408 * xs_sendpages - write pages directly to a socket
409 * @sock: socket to send on
410 * @addr: UDP only -- address of destination
411 * @addrlen: UDP only -- length of destination address
412 * @xdr: buffer containing this request
413 * @base: starting position in the buffer
416 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
418 unsigned int remainder = xdr->len - base;
424 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
430 if (base < xdr->head[0].iov_len || addr != NULL) {
431 unsigned int len = xdr->head[0].iov_len - base;
433 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
434 if (remainder == 0 || err != len)
439 base -= xdr->head[0].iov_len;
441 if (base < xdr->page_len) {
442 unsigned int len = xdr->page_len - base;
444 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
445 if (remainder == 0 || err != len)
450 base -= xdr->page_len;
452 if (base >= xdr->tail[0].iov_len)
454 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
463 static void xs_nospace_callback(struct rpc_task *task)
465 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
467 transport->inet->sk_write_pending--;
468 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
472 * xs_nospace - place task on wait queue if transmit was incomplete
473 * @task: task to put to sleep
476 static int xs_nospace(struct rpc_task *task)
478 struct rpc_rqst *req = task->tk_rqstp;
479 struct rpc_xprt *xprt = req->rq_xprt;
480 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
483 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
484 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
487 /* Protect against races with write_space */
488 spin_lock_bh(&xprt->transport_lock);
490 /* Don't race with disconnect */
491 if (xprt_connected(xprt)) {
492 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
495 * Notify TCP that we're limited by the application
498 set_bit(SOCK_NOSPACE, &transport->sock->flags);
499 transport->inet->sk_write_pending++;
500 /* ...and wait for more buffer space */
501 xprt_wait_for_buffer_space(task, xs_nospace_callback);
504 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
508 spin_unlock_bh(&xprt->transport_lock);
513 * xs_udp_send_request - write an RPC request to a UDP socket
514 * @task: address of RPC task that manages the state of an RPC request
517 * 0: The request has been sent
518 * EAGAIN: The socket was blocked, please call again later to
519 * complete the request
520 * ENOTCONN: Caller needs to invoke connect logic then call again
521 * other: Some other error occured, the request was not sent
523 static int xs_udp_send_request(struct rpc_task *task)
525 struct rpc_rqst *req = task->tk_rqstp;
526 struct rpc_xprt *xprt = req->rq_xprt;
527 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
528 struct xdr_buf *xdr = &req->rq_snd_buf;
531 xs_pktdump("packet data:",
532 req->rq_svec->iov_base,
533 req->rq_svec->iov_len);
535 if (!xprt_bound(xprt))
537 status = xs_sendpages(transport->sock,
542 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
543 xdr->len - req->rq_bytes_sent, status);
546 task->tk_bytes_sent += status;
547 if (status >= req->rq_slen)
549 /* Still some bytes left; set up for a retry later. */
556 /* Should we call xs_close() here? */
559 status = xs_nospace(task);
562 dprintk("RPC: sendmsg returned unrecognized error %d\n",
567 /* When the server has died, an ICMP port unreachable message
568 * prompts ECONNREFUSED. */
569 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
576 * xs_tcp_shutdown - gracefully shut down a TCP socket
579 * Initiates a graceful shutdown of the TCP socket by calling the
580 * equivalent of shutdown(SHUT_WR);
582 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
584 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
585 struct socket *sock = transport->sock;
588 kernel_sock_shutdown(sock, SHUT_WR);
591 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
593 u32 reclen = buf->len - sizeof(rpc_fraghdr);
594 rpc_fraghdr *base = buf->head[0].iov_base;
595 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
599 * xs_tcp_send_request - write an RPC request to a TCP socket
600 * @task: address of RPC task that manages the state of an RPC request
603 * 0: The request has been sent
604 * EAGAIN: The socket was blocked, please call again later to
605 * complete the request
606 * ENOTCONN: Caller needs to invoke connect logic then call again
607 * other: Some other error occured, the request was not sent
609 * XXX: In the case of soft timeouts, should we eventually give up
610 * if sendmsg is not able to make progress?
612 static int xs_tcp_send_request(struct rpc_task *task)
614 struct rpc_rqst *req = task->tk_rqstp;
615 struct rpc_xprt *xprt = req->rq_xprt;
616 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
617 struct xdr_buf *xdr = &req->rq_snd_buf;
620 xs_encode_tcp_record_marker(&req->rq_snd_buf);
622 xs_pktdump("packet data:",
623 req->rq_svec->iov_base,
624 req->rq_svec->iov_len);
626 /* Continue transmitting the packet/record. We must be careful
627 * to cope with writespace callbacks arriving _after_ we have
628 * called sendmsg(). */
630 status = xs_sendpages(transport->sock,
631 NULL, 0, xdr, req->rq_bytes_sent);
633 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
634 xdr->len - req->rq_bytes_sent, status);
636 if (unlikely(status < 0))
639 /* If we've sent the entire packet, immediately
640 * reset the count of bytes sent. */
641 req->rq_bytes_sent += status;
642 task->tk_bytes_sent += status;
643 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
644 req->rq_bytes_sent = 0;
657 /* Should we call xs_close() here? */
660 status = xs_nospace(task);
663 dprintk("RPC: sendmsg returned unrecognized error %d\n",
667 xs_tcp_shutdown(xprt);
670 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
677 * xs_tcp_release_xprt - clean up after a tcp transmission
681 * This cleans up if an error causes us to abort the transmission of a request.
682 * In this case, the socket may need to be reset in order to avoid confusing
685 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
687 struct rpc_rqst *req;
689 if (task != xprt->snd_task)
693 req = task->tk_rqstp;
694 if (req->rq_bytes_sent == 0)
696 if (req->rq_bytes_sent == req->rq_snd_buf.len)
698 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
700 xprt_release_xprt(xprt, task);
703 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
705 transport->old_data_ready = sk->sk_data_ready;
706 transport->old_state_change = sk->sk_state_change;
707 transport->old_write_space = sk->sk_write_space;
708 transport->old_error_report = sk->sk_error_report;
711 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
713 sk->sk_data_ready = transport->old_data_ready;
714 sk->sk_state_change = transport->old_state_change;
715 sk->sk_write_space = transport->old_write_space;
716 sk->sk_error_report = transport->old_error_report;
719 static void xs_reset_transport(struct sock_xprt *transport)
721 struct socket *sock = transport->sock;
722 struct sock *sk = transport->inet;
727 write_lock_bh(&sk->sk_callback_lock);
728 transport->inet = NULL;
729 transport->sock = NULL;
731 sk->sk_user_data = NULL;
733 xs_restore_old_callbacks(transport, sk);
734 write_unlock_bh(&sk->sk_callback_lock);
742 * xs_close - close a socket
745 * This is used when all requests are complete; ie, no DRC state remains
746 * on the server we want to save.
748 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
749 * xs_reset_transport() zeroing the socket from underneath a writer.
751 static void xs_close(struct rpc_xprt *xprt)
753 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
755 dprintk("RPC: xs_close xprt %p\n", xprt);
757 xs_reset_transport(transport);
758 xprt->reestablish_timeout = 0;
760 smp_mb__before_clear_bit();
761 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
762 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
763 clear_bit(XPRT_CLOSING, &xprt->state);
764 smp_mb__after_clear_bit();
765 xprt_disconnect_done(xprt);
768 static void xs_tcp_close(struct rpc_xprt *xprt)
770 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
773 xs_tcp_shutdown(xprt);
777 * xs_destroy - prepare to shutdown a transport
778 * @xprt: doomed transport
781 static void xs_destroy(struct rpc_xprt *xprt)
783 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
785 dprintk("RPC: xs_destroy xprt %p\n", xprt);
787 cancel_rearming_delayed_work(&transport->connect_worker);
790 xs_free_peer_addresses(xprt);
793 module_put(THIS_MODULE);
796 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
798 return (struct rpc_xprt *) sk->sk_user_data;
802 * xs_udp_data_ready - "data ready" callback for UDP sockets
803 * @sk: socket with data to read
804 * @len: how much data to read
807 static void xs_udp_data_ready(struct sock *sk, int len)
809 struct rpc_task *task;
810 struct rpc_xprt *xprt;
811 struct rpc_rqst *rovr;
813 int err, repsize, copied;
817 read_lock(&sk->sk_callback_lock);
818 dprintk("RPC: xs_udp_data_ready...\n");
819 if (!(xprt = xprt_from_sock(sk)))
822 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
828 repsize = skb->len - sizeof(struct udphdr);
830 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
834 /* Copy the XID from the skb... */
835 xp = skb_header_pointer(skb, sizeof(struct udphdr),
836 sizeof(_xid), &_xid);
840 /* Look up and lock the request corresponding to the given XID */
841 spin_lock(&xprt->transport_lock);
842 rovr = xprt_lookup_rqst(xprt, *xp);
845 task = rovr->rq_task;
847 if ((copied = rovr->rq_private_buf.buflen) > repsize)
850 /* Suck it into the iovec, verify checksum if not done by hw. */
851 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
852 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
856 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
858 /* Something worked... */
859 dst_confirm(skb_dst(skb));
861 xprt_adjust_cwnd(task, copied);
862 xprt_update_rtt(task);
863 xprt_complete_rqst(task, copied);
866 spin_unlock(&xprt->transport_lock);
868 skb_free_datagram(sk, skb);
870 read_unlock(&sk->sk_callback_lock);
873 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
875 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
879 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
880 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
881 used = xdr_skb_read_bits(desc, p, len);
882 transport->tcp_offset += used;
886 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
887 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
888 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
890 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
891 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
893 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
894 transport->tcp_offset = 0;
896 /* Sanity check of the record length */
897 if (unlikely(transport->tcp_reclen < 8)) {
898 dprintk("RPC: invalid TCP record fragment length\n");
899 xprt_force_disconnect(xprt);
902 dprintk("RPC: reading TCP record fragment of length %d\n",
903 transport->tcp_reclen);
906 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
908 if (transport->tcp_offset == transport->tcp_reclen) {
909 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
910 transport->tcp_offset = 0;
911 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
912 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
913 transport->tcp_flags |= TCP_RCV_COPY_XID;
914 transport->tcp_copied = 0;
919 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
924 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
925 dprintk("RPC: reading XID (%Zu bytes)\n", len);
926 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
927 used = xdr_skb_read_bits(desc, p, len);
928 transport->tcp_offset += used;
931 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
932 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
933 transport->tcp_copied = 4;
934 dprintk("RPC: reading %s XID %08x\n",
935 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
937 ntohl(transport->tcp_xid));
938 xs_tcp_check_fraghdr(transport);
941 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
942 struct xdr_skb_reader *desc)
949 * We want transport->tcp_offset to be 8 at the end of this routine
950 * (4 bytes for the xid and 4 bytes for the call/reply flag).
951 * When this function is called for the first time,
952 * transport->tcp_offset is 4 (after having already read the xid).
954 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
955 len = sizeof(calldir) - offset;
956 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
957 used = xdr_skb_read_bits(desc, &calldir, len);
958 transport->tcp_offset += used;
961 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
962 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
963 transport->tcp_flags |= TCP_RCV_COPY_DATA;
965 * We don't yet have the XDR buffer, so we will write the calldir
966 * out after we get the buffer from the 'struct rpc_rqst'
968 if (ntohl(calldir) == RPC_REPLY)
969 transport->tcp_flags |= TCP_RPC_REPLY;
971 transport->tcp_flags &= ~TCP_RPC_REPLY;
972 dprintk("RPC: reading %s CALL/REPLY flag %08x\n",
973 (transport->tcp_flags & TCP_RPC_REPLY) ?
974 "reply for" : "request with", calldir);
975 xs_tcp_check_fraghdr(transport);
978 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
979 struct xdr_skb_reader *desc,
980 struct rpc_rqst *req)
982 struct sock_xprt *transport =
983 container_of(xprt, struct sock_xprt, xprt);
984 struct xdr_buf *rcvbuf;
988 rcvbuf = &req->rq_private_buf;
990 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
992 * Save the RPC direction in the XDR buffer
994 __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ?
995 htonl(RPC_REPLY) : 0;
997 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
998 &calldir, sizeof(calldir));
999 transport->tcp_copied += sizeof(calldir);
1000 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1004 if (len > transport->tcp_reclen - transport->tcp_offset) {
1005 struct xdr_skb_reader my_desc;
1007 len = transport->tcp_reclen - transport->tcp_offset;
1008 memcpy(&my_desc, desc, sizeof(my_desc));
1009 my_desc.count = len;
1010 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1011 &my_desc, xdr_skb_read_bits);
1015 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1016 desc, xdr_skb_read_bits);
1019 transport->tcp_copied += r;
1020 transport->tcp_offset += r;
1023 /* Error when copying to the receive buffer,
1024 * usually because we weren't able to allocate
1025 * additional buffer pages. All we can do now
1026 * is turn off TCP_RCV_COPY_DATA, so the request
1027 * will not receive any additional updates,
1029 * Any remaining data from this record will
1032 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1033 dprintk("RPC: XID %08x truncated request\n",
1034 ntohl(transport->tcp_xid));
1035 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1036 "tcp_offset = %u, tcp_reclen = %u\n",
1037 xprt, transport->tcp_copied,
1038 transport->tcp_offset, transport->tcp_reclen);
1042 dprintk("RPC: XID %08x read %Zd bytes\n",
1043 ntohl(transport->tcp_xid), r);
1044 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1045 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1046 transport->tcp_offset, transport->tcp_reclen);
1048 if (transport->tcp_copied == req->rq_private_buf.buflen)
1049 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1050 else if (transport->tcp_offset == transport->tcp_reclen) {
1051 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1052 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1059 * Finds the request corresponding to the RPC xid and invokes the common
1060 * tcp read code to read the data.
1062 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1063 struct xdr_skb_reader *desc)
1065 struct sock_xprt *transport =
1066 container_of(xprt, struct sock_xprt, xprt);
1067 struct rpc_rqst *req;
1069 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1071 /* Find and lock the request corresponding to this xid */
1072 spin_lock(&xprt->transport_lock);
1073 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1075 dprintk("RPC: XID %08x request not found!\n",
1076 ntohl(transport->tcp_xid));
1077 spin_unlock(&xprt->transport_lock);
1081 xs_tcp_read_common(xprt, desc, req);
1083 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1084 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1086 spin_unlock(&xprt->transport_lock);
1090 #if defined(CONFIG_NFS_V4_1)
1092 * Obtains an rpc_rqst previously allocated and invokes the common
1093 * tcp read code to read the data. The result is placed in the callback
1095 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1096 * connection and return -1.
1098 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1099 struct xdr_skb_reader *desc)
1101 struct sock_xprt *transport =
1102 container_of(xprt, struct sock_xprt, xprt);
1103 struct rpc_rqst *req;
1105 req = xprt_alloc_bc_request(xprt);
1107 printk(KERN_WARNING "Callback slot table overflowed\n");
1108 xprt_force_disconnect(xprt);
1112 req->rq_xid = transport->tcp_xid;
1113 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1114 xs_tcp_read_common(xprt, desc, req);
1116 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1117 struct svc_serv *bc_serv = xprt->bc_serv;
1120 * Add callback request to callback list. The callback
1121 * service sleeps on the sv_cb_waitq waiting for new
1122 * requests. Wake it up after adding enqueing the
1125 dprintk("RPC: add callback request to list\n");
1126 spin_lock(&bc_serv->sv_cb_lock);
1127 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1128 spin_unlock(&bc_serv->sv_cb_lock);
1129 wake_up(&bc_serv->sv_cb_waitq);
1132 req->rq_private_buf.len = transport->tcp_copied;
1137 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1138 struct xdr_skb_reader *desc)
1140 struct sock_xprt *transport =
1141 container_of(xprt, struct sock_xprt, xprt);
1143 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1144 xs_tcp_read_reply(xprt, desc) :
1145 xs_tcp_read_callback(xprt, desc);
1148 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1149 struct xdr_skb_reader *desc)
1151 return xs_tcp_read_reply(xprt, desc);
1153 #endif /* CONFIG_NFS_V4_1 */
1156 * Read data off the transport. This can be either an RPC_CALL or an
1157 * RPC_REPLY. Relay the processing to helper functions.
1159 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1160 struct xdr_skb_reader *desc)
1162 struct sock_xprt *transport =
1163 container_of(xprt, struct sock_xprt, xprt);
1165 if (_xs_tcp_read_data(xprt, desc) == 0)
1166 xs_tcp_check_fraghdr(transport);
1169 * The transport_lock protects the request handling.
1170 * There's no need to hold it to update the tcp_flags.
1172 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1176 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1180 len = transport->tcp_reclen - transport->tcp_offset;
1181 if (len > desc->count)
1184 desc->offset += len;
1185 transport->tcp_offset += len;
1186 dprintk("RPC: discarded %Zu bytes\n", len);
1187 xs_tcp_check_fraghdr(transport);
1190 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1192 struct rpc_xprt *xprt = rd_desc->arg.data;
1193 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1194 struct xdr_skb_reader desc = {
1200 dprintk("RPC: xs_tcp_data_recv started\n");
1202 /* Read in a new fragment marker if necessary */
1203 /* Can we ever really expect to get completely empty fragments? */
1204 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1205 xs_tcp_read_fraghdr(xprt, &desc);
1208 /* Read in the xid if necessary */
1209 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1210 xs_tcp_read_xid(transport, &desc);
1213 /* Read in the call/reply flag */
1214 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1215 xs_tcp_read_calldir(transport, &desc);
1218 /* Read in the request data */
1219 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1220 xs_tcp_read_data(xprt, &desc);
1223 /* Skip over any trailing bytes on short reads */
1224 xs_tcp_read_discard(transport, &desc);
1225 } while (desc.count);
1226 dprintk("RPC: xs_tcp_data_recv done\n");
1227 return len - desc.count;
1231 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1232 * @sk: socket with data to read
1233 * @bytes: how much data to read
1236 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1238 struct rpc_xprt *xprt;
1239 read_descriptor_t rd_desc;
1242 dprintk("RPC: xs_tcp_data_ready...\n");
1244 read_lock(&sk->sk_callback_lock);
1245 if (!(xprt = xprt_from_sock(sk)))
1250 /* Any data means we had a useful conversation, so
1251 * the we don't need to delay the next reconnect
1253 if (xprt->reestablish_timeout)
1254 xprt->reestablish_timeout = 0;
1256 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1257 rd_desc.arg.data = xprt;
1259 rd_desc.count = 65536;
1260 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1263 read_unlock(&sk->sk_callback_lock);
1267 * Do the equivalent of linger/linger2 handling for dealing with
1268 * broken servers that don't close the socket in a timely
1271 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1272 unsigned long timeout)
1274 struct sock_xprt *transport;
1276 if (xprt_test_and_set_connecting(xprt))
1278 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1279 transport = container_of(xprt, struct sock_xprt, xprt);
1280 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1284 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1286 struct sock_xprt *transport;
1288 transport = container_of(xprt, struct sock_xprt, xprt);
1290 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1291 !cancel_delayed_work(&transport->connect_worker))
1293 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1294 xprt_clear_connecting(xprt);
1297 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1299 smp_mb__before_clear_bit();
1300 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1301 clear_bit(XPRT_CLOSING, &xprt->state);
1302 smp_mb__after_clear_bit();
1303 /* Mark transport as closed and wake up all pending tasks */
1304 xprt_disconnect_done(xprt);
1308 * xs_tcp_state_change - callback to handle TCP socket state changes
1309 * @sk: socket whose state has changed
1312 static void xs_tcp_state_change(struct sock *sk)
1314 struct rpc_xprt *xprt;
1316 read_lock(&sk->sk_callback_lock);
1317 if (!(xprt = xprt_from_sock(sk)))
1319 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1320 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1321 sk->sk_state, xprt_connected(xprt),
1322 sock_flag(sk, SOCK_DEAD),
1323 sock_flag(sk, SOCK_ZAPPED));
1325 switch (sk->sk_state) {
1326 case TCP_ESTABLISHED:
1327 spin_lock_bh(&xprt->transport_lock);
1328 if (!xprt_test_and_set_connected(xprt)) {
1329 struct sock_xprt *transport = container_of(xprt,
1330 struct sock_xprt, xprt);
1332 /* Reset TCP record info */
1333 transport->tcp_offset = 0;
1334 transport->tcp_reclen = 0;
1335 transport->tcp_copied = 0;
1336 transport->tcp_flags =
1337 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1339 xprt_wake_pending_tasks(xprt, -EAGAIN);
1341 spin_unlock_bh(&xprt->transport_lock);
1344 /* The client initiated a shutdown of the socket */
1345 xprt->connect_cookie++;
1346 xprt->reestablish_timeout = 0;
1347 set_bit(XPRT_CLOSING, &xprt->state);
1348 smp_mb__before_clear_bit();
1349 clear_bit(XPRT_CONNECTED, &xprt->state);
1350 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1351 smp_mb__after_clear_bit();
1352 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1354 case TCP_CLOSE_WAIT:
1355 /* The server initiated a shutdown of the socket */
1356 xprt_force_disconnect(xprt);
1358 xprt->connect_cookie++;
1361 * If the server closed down the connection, make sure that
1362 * we back off before reconnecting
1364 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1365 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1368 set_bit(XPRT_CLOSING, &xprt->state);
1369 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1370 smp_mb__before_clear_bit();
1371 clear_bit(XPRT_CONNECTED, &xprt->state);
1372 smp_mb__after_clear_bit();
1375 xs_tcp_cancel_linger_timeout(xprt);
1376 xs_sock_mark_closed(xprt);
1379 read_unlock(&sk->sk_callback_lock);
1383 * xs_error_report - callback mainly for catching socket errors
1386 static void xs_error_report(struct sock *sk)
1388 struct rpc_xprt *xprt;
1390 read_lock(&sk->sk_callback_lock);
1391 if (!(xprt = xprt_from_sock(sk)))
1393 dprintk("RPC: %s client %p...\n"
1395 __func__, xprt, sk->sk_err);
1396 xprt_wake_pending_tasks(xprt, -EAGAIN);
1398 read_unlock(&sk->sk_callback_lock);
1401 static void xs_write_space(struct sock *sk)
1403 struct socket *sock;
1404 struct rpc_xprt *xprt;
1406 if (unlikely(!(sock = sk->sk_socket)))
1408 clear_bit(SOCK_NOSPACE, &sock->flags);
1410 if (unlikely(!(xprt = xprt_from_sock(sk))))
1412 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1415 xprt_write_space(xprt);
1419 * xs_udp_write_space - callback invoked when socket buffer space
1421 * @sk: socket whose state has changed
1423 * Called when more output buffer space is available for this socket.
1424 * We try not to wake our writers until they can make "significant"
1425 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1426 * with a bunch of small requests.
1428 static void xs_udp_write_space(struct sock *sk)
1430 read_lock(&sk->sk_callback_lock);
1432 /* from net/core/sock.c:sock_def_write_space */
1433 if (sock_writeable(sk))
1436 read_unlock(&sk->sk_callback_lock);
1440 * xs_tcp_write_space - callback invoked when socket buffer space
1442 * @sk: socket whose state has changed
1444 * Called when more output buffer space is available for this socket.
1445 * We try not to wake our writers until they can make "significant"
1446 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1447 * with a bunch of small requests.
1449 static void xs_tcp_write_space(struct sock *sk)
1451 read_lock(&sk->sk_callback_lock);
1453 /* from net/core/stream.c:sk_stream_write_space */
1454 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1457 read_unlock(&sk->sk_callback_lock);
1460 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1462 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1463 struct sock *sk = transport->inet;
1465 if (transport->rcvsize) {
1466 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1467 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1469 if (transport->sndsize) {
1470 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1471 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1472 sk->sk_write_space(sk);
1477 * xs_udp_set_buffer_size - set send and receive limits
1478 * @xprt: generic transport
1479 * @sndsize: requested size of send buffer, in bytes
1480 * @rcvsize: requested size of receive buffer, in bytes
1482 * Set socket send and receive buffer size limits.
1484 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1486 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1488 transport->sndsize = 0;
1490 transport->sndsize = sndsize + 1024;
1491 transport->rcvsize = 0;
1493 transport->rcvsize = rcvsize + 1024;
1495 xs_udp_do_set_buffer_size(xprt);
1499 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1500 * @task: task that timed out
1502 * Adjust the congestion window after a retransmit timeout has occurred.
1504 static void xs_udp_timer(struct rpc_task *task)
1506 xprt_adjust_cwnd(task, -ETIMEDOUT);
1509 static unsigned short xs_get_random_port(void)
1511 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1512 unsigned short rand = (unsigned short) net_random() % range;
1513 return rand + xprt_min_resvport;
1517 * xs_set_port - reset the port number in the remote endpoint address
1518 * @xprt: generic transport
1519 * @port: new port number
1522 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1524 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1526 rpc_set_port(xs_addr(xprt), port);
1527 xs_update_peer_port(xprt);
1530 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1532 unsigned short port = transport->srcport;
1534 if (port == 0 && transport->xprt.resvport)
1535 port = xs_get_random_port();
1539 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1541 if (transport->srcport != 0)
1542 transport->srcport = 0;
1543 if (!transport->xprt.resvport)
1545 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1546 return xprt_max_resvport;
1550 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1552 struct sockaddr_in myaddr = {
1553 .sin_family = AF_INET,
1555 struct sockaddr_in *sa;
1557 unsigned short port = xs_get_srcport(transport, sock);
1558 unsigned short last;
1560 sa = (struct sockaddr_in *)&transport->srcaddr;
1561 myaddr.sin_addr = sa->sin_addr;
1563 myaddr.sin_port = htons(port);
1564 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1569 transport->srcport = port;
1573 port = xs_next_srcport(transport, sock, port);
1576 } while (err == -EADDRINUSE && nloop != 2);
1577 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1578 __func__, &myaddr.sin_addr,
1579 port, err ? "failed" : "ok", err);
1583 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1585 struct sockaddr_in6 myaddr = {
1586 .sin6_family = AF_INET6,
1588 struct sockaddr_in6 *sa;
1590 unsigned short port = xs_get_srcport(transport, sock);
1591 unsigned short last;
1593 sa = (struct sockaddr_in6 *)&transport->srcaddr;
1594 myaddr.sin6_addr = sa->sin6_addr;
1596 myaddr.sin6_port = htons(port);
1597 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1602 transport->srcport = port;
1606 port = xs_next_srcport(transport, sock, port);
1609 } while (err == -EADDRINUSE && nloop != 2);
1610 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1611 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1615 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1616 static struct lock_class_key xs_key[2];
1617 static struct lock_class_key xs_slock_key[2];
1619 static inline void xs_reclassify_socket4(struct socket *sock)
1621 struct sock *sk = sock->sk;
1623 BUG_ON(sock_owned_by_user(sk));
1624 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1625 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1628 static inline void xs_reclassify_socket6(struct socket *sock)
1630 struct sock *sk = sock->sk;
1632 BUG_ON(sock_owned_by_user(sk));
1633 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1634 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1637 static inline void xs_reclassify_socket4(struct socket *sock)
1641 static inline void xs_reclassify_socket6(struct socket *sock)
1646 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1648 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1650 if (!transport->inet) {
1651 struct sock *sk = sock->sk;
1653 write_lock_bh(&sk->sk_callback_lock);
1655 xs_save_old_callbacks(transport, sk);
1657 sk->sk_user_data = xprt;
1658 sk->sk_data_ready = xs_udp_data_ready;
1659 sk->sk_write_space = xs_udp_write_space;
1660 sk->sk_error_report = xs_error_report;
1661 sk->sk_no_check = UDP_CSUM_NORCV;
1662 sk->sk_allocation = GFP_ATOMIC;
1664 xprt_set_connected(xprt);
1666 /* Reset to new socket */
1667 transport->sock = sock;
1668 transport->inet = sk;
1670 write_unlock_bh(&sk->sk_callback_lock);
1672 xs_udp_do_set_buffer_size(xprt);
1676 * xs_udp_connect_worker4 - set up a UDP socket
1677 * @work: RPC transport to connect
1679 * Invoked by a work queue tasklet.
1681 static void xs_udp_connect_worker4(struct work_struct *work)
1683 struct sock_xprt *transport =
1684 container_of(work, struct sock_xprt, connect_worker.work);
1685 struct rpc_xprt *xprt = &transport->xprt;
1686 struct socket *sock = transport->sock;
1687 int err, status = -EIO;
1692 /* Start by resetting any existing state */
1693 xs_reset_transport(transport);
1695 err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1697 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1700 xs_reclassify_socket4(sock);
1702 if (xs_bind4(transport, sock)) {
1707 dprintk("RPC: worker connecting xprt %p via %s to "
1708 "%s (port %s)\n", xprt,
1709 xprt->address_strings[RPC_DISPLAY_PROTO],
1710 xprt->address_strings[RPC_DISPLAY_ADDR],
1711 xprt->address_strings[RPC_DISPLAY_PORT]);
1713 xs_udp_finish_connecting(xprt, sock);
1716 xprt_clear_connecting(xprt);
1717 xprt_wake_pending_tasks(xprt, status);
1721 * xs_udp_connect_worker6 - set up a UDP socket
1722 * @work: RPC transport to connect
1724 * Invoked by a work queue tasklet.
1726 static void xs_udp_connect_worker6(struct work_struct *work)
1728 struct sock_xprt *transport =
1729 container_of(work, struct sock_xprt, connect_worker.work);
1730 struct rpc_xprt *xprt = &transport->xprt;
1731 struct socket *sock = transport->sock;
1732 int err, status = -EIO;
1737 /* Start by resetting any existing state */
1738 xs_reset_transport(transport);
1740 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
1742 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1745 xs_reclassify_socket6(sock);
1747 if (xs_bind6(transport, sock) < 0) {
1752 dprintk("RPC: worker connecting xprt %p via %s to "
1753 "%s (port %s)\n", xprt,
1754 xprt->address_strings[RPC_DISPLAY_PROTO],
1755 xprt->address_strings[RPC_DISPLAY_ADDR],
1756 xprt->address_strings[RPC_DISPLAY_PORT]);
1758 xs_udp_finish_connecting(xprt, sock);
1761 xprt_clear_connecting(xprt);
1762 xprt_wake_pending_tasks(xprt, status);
1766 * We need to preserve the port number so the reply cache on the server can
1767 * find our cached RPC replies when we get around to reconnecting.
1769 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1772 struct sockaddr any;
1774 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1777 * Disconnect the transport socket by doing a connect operation
1778 * with AF_UNSPEC. This should return immediately...
1780 memset(&any, 0, sizeof(any));
1781 any.sa_family = AF_UNSPEC;
1782 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1784 xs_sock_mark_closed(xprt);
1786 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1790 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1792 unsigned int state = transport->inet->sk_state;
1794 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED)
1796 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT))
1798 xs_abort_connection(xprt, transport);
1801 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1803 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1805 if (!transport->inet) {
1806 struct sock *sk = sock->sk;
1808 write_lock_bh(&sk->sk_callback_lock);
1810 xs_save_old_callbacks(transport, sk);
1812 sk->sk_user_data = xprt;
1813 sk->sk_data_ready = xs_tcp_data_ready;
1814 sk->sk_state_change = xs_tcp_state_change;
1815 sk->sk_write_space = xs_tcp_write_space;
1816 sk->sk_error_report = xs_error_report;
1817 sk->sk_allocation = GFP_ATOMIC;
1819 /* socket options */
1820 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1821 sock_reset_flag(sk, SOCK_LINGER);
1822 tcp_sk(sk)->linger2 = 0;
1823 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1825 xprt_clear_connected(xprt);
1827 /* Reset to new socket */
1828 transport->sock = sock;
1829 transport->inet = sk;
1831 write_unlock_bh(&sk->sk_callback_lock);
1834 if (!xprt_bound(xprt))
1837 /* Tell the socket layer to start connecting... */
1838 xprt->stat.connect_count++;
1839 xprt->stat.connect_start = jiffies;
1840 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1844 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
1845 * @xprt: RPC transport to connect
1846 * @transport: socket transport to connect
1847 * @create_sock: function to create a socket of the correct type
1849 * Invoked by a work queue tasklet.
1851 static void xs_tcp_setup_socket(struct rpc_xprt *xprt,
1852 struct sock_xprt *transport,
1853 struct socket *(*create_sock)(struct rpc_xprt *,
1854 struct sock_xprt *))
1856 struct socket *sock = transport->sock;
1863 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1864 sock = create_sock(xprt, transport);
1866 status = PTR_ERR(sock);
1872 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
1874 /* "close" the socket, preserving the local port */
1875 xs_tcp_reuse_connection(xprt, transport);
1881 dprintk("RPC: worker connecting xprt %p via %s to "
1882 "%s (port %s)\n", xprt,
1883 xprt->address_strings[RPC_DISPLAY_PROTO],
1884 xprt->address_strings[RPC_DISPLAY_ADDR],
1885 xprt->address_strings[RPC_DISPLAY_PORT]);
1887 status = xs_tcp_finish_connecting(xprt, sock);
1888 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1889 xprt, -status, xprt_connected(xprt),
1890 sock->sk->sk_state);
1893 printk("%s: connect returned unhandled error %d\n",
1895 case -EADDRNOTAVAIL:
1896 /* We're probably in TIME_WAIT. Get rid of existing socket,
1899 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1900 xprt_force_disconnect(xprt);
1905 /* retry with existing socket, after a delay */
1909 xprt_clear_connecting(xprt);
1912 /* Happens, for instance, if the user specified a link
1913 * local IPv6 address without a scope-id.
1920 xprt_clear_connecting(xprt);
1921 xprt_wake_pending_tasks(xprt, status);
1924 static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt,
1925 struct sock_xprt *transport)
1927 struct socket *sock;
1930 /* start from scratch */
1931 err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1933 dprintk("RPC: can't create TCP transport socket (%d).\n",
1937 xs_reclassify_socket4(sock);
1939 if (xs_bind4(transport, sock) < 0) {
1945 return ERR_PTR(-EIO);
1949 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1950 * @work: RPC transport to connect
1952 * Invoked by a work queue tasklet.
1954 static void xs_tcp_connect_worker4(struct work_struct *work)
1956 struct sock_xprt *transport =
1957 container_of(work, struct sock_xprt, connect_worker.work);
1958 struct rpc_xprt *xprt = &transport->xprt;
1960 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4);
1963 static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt,
1964 struct sock_xprt *transport)
1966 struct socket *sock;
1969 /* start from scratch */
1970 err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock);
1972 dprintk("RPC: can't create TCP transport socket (%d).\n",
1976 xs_reclassify_socket6(sock);
1978 if (xs_bind6(transport, sock) < 0) {
1984 return ERR_PTR(-EIO);
1988 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1989 * @work: RPC transport to connect
1991 * Invoked by a work queue tasklet.
1993 static void xs_tcp_connect_worker6(struct work_struct *work)
1995 struct sock_xprt *transport =
1996 container_of(work, struct sock_xprt, connect_worker.work);
1997 struct rpc_xprt *xprt = &transport->xprt;
1999 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6);
2003 * xs_connect - connect a socket to a remote endpoint
2004 * @task: address of RPC task that manages state of connect request
2006 * TCP: If the remote end dropped the connection, delay reconnecting.
2008 * UDP socket connects are synchronous, but we use a work queue anyway
2009 * to guarantee that even unprivileged user processes can set up a
2010 * socket on a privileged port.
2012 * If a UDP socket connect fails, the delay behavior here prevents
2013 * retry floods (hard mounts).
2015 static void xs_connect(struct rpc_task *task)
2017 struct rpc_xprt *xprt = task->tk_xprt;
2018 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2020 if (xprt_test_and_set_connecting(xprt))
2023 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2024 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2026 xprt, xprt->reestablish_timeout / HZ);
2027 queue_delayed_work(rpciod_workqueue,
2028 &transport->connect_worker,
2029 xprt->reestablish_timeout);
2030 xprt->reestablish_timeout <<= 1;
2031 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2032 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2033 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2034 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2036 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2037 queue_delayed_work(rpciod_workqueue,
2038 &transport->connect_worker, 0);
2042 static void xs_tcp_connect(struct rpc_task *task)
2044 struct rpc_xprt *xprt = task->tk_xprt;
2046 /* Exit if we need to wait for socket shutdown to complete */
2047 if (test_bit(XPRT_CLOSING, &xprt->state))
2053 * xs_udp_print_stats - display UDP socket-specifc stats
2054 * @xprt: rpc_xprt struct containing statistics
2058 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2060 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2062 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
2064 xprt->stat.bind_count,
2067 xprt->stat.bad_xids,
2069 xprt->stat.bklog_u);
2073 * xs_tcp_print_stats - display TCP socket-specifc stats
2074 * @xprt: rpc_xprt struct containing statistics
2078 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2080 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2083 if (xprt_connected(xprt))
2084 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2086 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
2088 xprt->stat.bind_count,
2089 xprt->stat.connect_count,
2090 xprt->stat.connect_time,
2094 xprt->stat.bad_xids,
2096 xprt->stat.bklog_u);
2100 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2101 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2102 * to use the server side send routines.
2104 static void *bc_malloc(struct rpc_task *task, size_t size)
2107 struct rpc_buffer *buf;
2109 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2110 page = alloc_page(GFP_KERNEL);
2115 buf = page_address(page);
2116 buf->len = PAGE_SIZE;
2122 * Free the space allocated in the bc_alloc routine
2124 static void bc_free(void *buffer)
2126 struct rpc_buffer *buf;
2131 buf = container_of(buffer, struct rpc_buffer, data);
2132 free_page((unsigned long)buf);
2136 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2137 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2139 static int bc_sendto(struct rpc_rqst *req)
2142 struct xdr_buf *xbufp = &req->rq_snd_buf;
2143 struct rpc_xprt *xprt = req->rq_xprt;
2144 struct sock_xprt *transport =
2145 container_of(xprt, struct sock_xprt, xprt);
2146 struct socket *sock = transport->sock;
2147 unsigned long headoff;
2148 unsigned long tailoff;
2151 * Set up the rpc header and record marker stuff
2153 xs_encode_tcp_record_marker(xbufp);
2155 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2156 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2157 len = svc_send_common(sock, xbufp,
2158 virt_to_page(xbufp->head[0].iov_base), headoff,
2159 xbufp->tail[0].iov_base, tailoff);
2161 if (len != xbufp->len) {
2162 printk(KERN_NOTICE "Error sending entire callback!\n");
2170 * The send routine. Borrows from svc_send
2172 static int bc_send_request(struct rpc_task *task)
2174 struct rpc_rqst *req = task->tk_rqstp;
2175 struct svc_xprt *xprt;
2176 struct svc_sock *svsk;
2179 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2181 * Get the server socket associated with this callback xprt
2183 xprt = req->rq_xprt->bc_xprt;
2184 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2187 * Grab the mutex to serialize data as the connection is shared
2188 * with the fore channel
2190 if (!mutex_trylock(&xprt->xpt_mutex)) {
2191 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2192 if (!mutex_trylock(&xprt->xpt_mutex))
2194 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2196 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2199 len = bc_sendto(req);
2200 mutex_unlock(&xprt->xpt_mutex);
2209 * The close routine. Since this is client initiated, we do nothing
2212 static void bc_close(struct rpc_xprt *xprt)
2218 * The xprt destroy routine. Again, because this connection is client
2219 * initiated, we do nothing
2222 static void bc_destroy(struct rpc_xprt *xprt)
2227 static struct rpc_xprt_ops xs_udp_ops = {
2228 .set_buffer_size = xs_udp_set_buffer_size,
2229 .reserve_xprt = xprt_reserve_xprt_cong,
2230 .release_xprt = xprt_release_xprt_cong,
2231 .rpcbind = rpcb_getport_async,
2232 .set_port = xs_set_port,
2233 .connect = xs_connect,
2234 .buf_alloc = rpc_malloc,
2235 .buf_free = rpc_free,
2236 .send_request = xs_udp_send_request,
2237 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2238 .timer = xs_udp_timer,
2239 .release_request = xprt_release_rqst_cong,
2241 .destroy = xs_destroy,
2242 .print_stats = xs_udp_print_stats,
2245 static struct rpc_xprt_ops xs_tcp_ops = {
2246 .reserve_xprt = xprt_reserve_xprt,
2247 .release_xprt = xs_tcp_release_xprt,
2248 .rpcbind = rpcb_getport_async,
2249 .set_port = xs_set_port,
2250 .connect = xs_tcp_connect,
2251 .buf_alloc = rpc_malloc,
2252 .buf_free = rpc_free,
2253 .send_request = xs_tcp_send_request,
2254 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2255 #if defined(CONFIG_NFS_V4_1)
2256 .release_request = bc_release_request,
2257 #endif /* CONFIG_NFS_V4_1 */
2258 .close = xs_tcp_close,
2259 .destroy = xs_destroy,
2260 .print_stats = xs_tcp_print_stats,
2264 * The rpc_xprt_ops for the server backchannel
2267 static struct rpc_xprt_ops bc_tcp_ops = {
2268 .reserve_xprt = xprt_reserve_xprt,
2269 .release_xprt = xprt_release_xprt,
2270 .buf_alloc = bc_malloc,
2271 .buf_free = bc_free,
2272 .send_request = bc_send_request,
2273 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2275 .destroy = bc_destroy,
2276 .print_stats = xs_tcp_print_stats,
2279 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2280 unsigned int slot_table_size)
2282 struct rpc_xprt *xprt;
2283 struct sock_xprt *new;
2285 if (args->addrlen > sizeof(xprt->addr)) {
2286 dprintk("RPC: xs_setup_xprt: address too large\n");
2287 return ERR_PTR(-EBADF);
2290 new = kzalloc(sizeof(*new), GFP_KERNEL);
2292 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2294 return ERR_PTR(-ENOMEM);
2298 xprt->max_reqs = slot_table_size;
2299 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
2300 if (xprt->slot == NULL) {
2302 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
2304 return ERR_PTR(-ENOMEM);
2307 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2308 xprt->addrlen = args->addrlen;
2310 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2315 static const struct rpc_timeout xs_udp_default_timeout = {
2316 .to_initval = 5 * HZ,
2317 .to_maxval = 30 * HZ,
2318 .to_increment = 5 * HZ,
2323 * xs_setup_udp - Set up transport to use a UDP socket
2324 * @args: rpc transport creation arguments
2327 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2329 struct sockaddr *addr = args->dstaddr;
2330 struct rpc_xprt *xprt;
2331 struct sock_xprt *transport;
2333 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
2336 transport = container_of(xprt, struct sock_xprt, xprt);
2338 xprt->prot = IPPROTO_UDP;
2340 /* XXX: header size can vary due to auth type, IPv6, etc. */
2341 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2343 xprt->bind_timeout = XS_BIND_TO;
2344 xprt->connect_timeout = XS_UDP_CONN_TO;
2345 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2346 xprt->idle_timeout = XS_IDLE_DISC_TO;
2348 xprt->ops = &xs_udp_ops;
2350 xprt->timeout = &xs_udp_default_timeout;
2352 switch (addr->sa_family) {
2354 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2355 xprt_set_bound(xprt);
2357 INIT_DELAYED_WORK(&transport->connect_worker,
2358 xs_udp_connect_worker4);
2359 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2362 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2363 xprt_set_bound(xprt);
2365 INIT_DELAYED_WORK(&transport->connect_worker,
2366 xs_udp_connect_worker6);
2367 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2371 return ERR_PTR(-EAFNOSUPPORT);
2374 if (xprt_bound(xprt))
2375 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2376 xprt->address_strings[RPC_DISPLAY_ADDR],
2377 xprt->address_strings[RPC_DISPLAY_PORT],
2378 xprt->address_strings[RPC_DISPLAY_PROTO]);
2380 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2381 xprt->address_strings[RPC_DISPLAY_ADDR],
2382 xprt->address_strings[RPC_DISPLAY_PROTO]);
2384 if (try_module_get(THIS_MODULE))
2389 return ERR_PTR(-EINVAL);
2392 static const struct rpc_timeout xs_tcp_default_timeout = {
2393 .to_initval = 60 * HZ,
2394 .to_maxval = 60 * HZ,
2399 * xs_setup_tcp - Set up transport to use a TCP socket
2400 * @args: rpc transport creation arguments
2403 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2405 struct sockaddr *addr = args->dstaddr;
2406 struct rpc_xprt *xprt;
2407 struct sock_xprt *transport;
2409 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2412 transport = container_of(xprt, struct sock_xprt, xprt);
2414 xprt->prot = IPPROTO_TCP;
2415 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2416 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2418 xprt->bind_timeout = XS_BIND_TO;
2419 xprt->connect_timeout = XS_TCP_CONN_TO;
2420 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2421 xprt->idle_timeout = XS_IDLE_DISC_TO;
2423 xprt->ops = &xs_tcp_ops;
2424 xprt->timeout = &xs_tcp_default_timeout;
2426 switch (addr->sa_family) {
2428 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2429 xprt_set_bound(xprt);
2431 INIT_DELAYED_WORK(&transport->connect_worker,
2432 xs_tcp_connect_worker4);
2433 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2436 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2437 xprt_set_bound(xprt);
2439 INIT_DELAYED_WORK(&transport->connect_worker,
2440 xs_tcp_connect_worker6);
2441 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2445 return ERR_PTR(-EAFNOSUPPORT);
2448 if (xprt_bound(xprt))
2449 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2450 xprt->address_strings[RPC_DISPLAY_ADDR],
2451 xprt->address_strings[RPC_DISPLAY_PORT],
2452 xprt->address_strings[RPC_DISPLAY_PROTO]);
2454 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2455 xprt->address_strings[RPC_DISPLAY_ADDR],
2456 xprt->address_strings[RPC_DISPLAY_PROTO]);
2459 if (try_module_get(THIS_MODULE))
2464 return ERR_PTR(-EINVAL);
2468 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2469 * @args: rpc transport creation arguments
2472 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2474 struct sockaddr *addr = args->dstaddr;
2475 struct rpc_xprt *xprt;
2476 struct sock_xprt *transport;
2477 struct svc_sock *bc_sock;
2482 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2485 transport = container_of(xprt, struct sock_xprt, xprt);
2487 xprt->prot = IPPROTO_TCP;
2488 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2489 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2490 xprt->timeout = &xs_tcp_default_timeout;
2493 xprt_set_bound(xprt);
2494 xprt->bind_timeout = 0;
2495 xprt->connect_timeout = 0;
2496 xprt->reestablish_timeout = 0;
2497 xprt->idle_timeout = 0;
2500 * The backchannel uses the same socket connection as the
2503 xprt->bc_xprt = args->bc_xprt;
2504 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2505 bc_sock->sk_bc_xprt = xprt;
2506 transport->sock = bc_sock->sk_sock;
2507 transport->inet = bc_sock->sk_sk;
2509 xprt->ops = &bc_tcp_ops;
2511 switch (addr->sa_family) {
2513 xs_format_peer_addresses(xprt, "tcp",
2517 xs_format_peer_addresses(xprt, "tcp",
2518 RPCBIND_NETID_TCP6);
2522 return ERR_PTR(-EAFNOSUPPORT);
2525 if (xprt_bound(xprt))
2526 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2527 xprt->address_strings[RPC_DISPLAY_ADDR],
2528 xprt->address_strings[RPC_DISPLAY_PORT],
2529 xprt->address_strings[RPC_DISPLAY_PROTO]);
2531 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2532 xprt->address_strings[RPC_DISPLAY_ADDR],
2533 xprt->address_strings[RPC_DISPLAY_PROTO]);
2536 * Since we don't want connections for the backchannel, we set
2537 * the xprt status to connected
2539 xprt_set_connected(xprt);
2542 if (try_module_get(THIS_MODULE))
2546 return ERR_PTR(-EINVAL);
2549 static struct xprt_class xs_udp_transport = {
2550 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2552 .owner = THIS_MODULE,
2553 .ident = XPRT_TRANSPORT_UDP,
2554 .setup = xs_setup_udp,
2557 static struct xprt_class xs_tcp_transport = {
2558 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2560 .owner = THIS_MODULE,
2561 .ident = XPRT_TRANSPORT_TCP,
2562 .setup = xs_setup_tcp,
2565 static struct xprt_class xs_bc_tcp_transport = {
2566 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2567 .name = "tcp NFSv4.1 backchannel",
2568 .owner = THIS_MODULE,
2569 .ident = XPRT_TRANSPORT_BC_TCP,
2570 .setup = xs_setup_bc_tcp,
2574 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2577 int init_socket_xprt(void)
2580 if (!sunrpc_table_header)
2581 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2584 xprt_register_transport(&xs_udp_transport);
2585 xprt_register_transport(&xs_tcp_transport);
2586 xprt_register_transport(&xs_bc_tcp_transport);
2592 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2595 void cleanup_socket_xprt(void)
2598 if (sunrpc_table_header) {
2599 unregister_sysctl_table(sunrpc_table_header);
2600 sunrpc_table_header = NULL;
2604 xprt_unregister_transport(&xs_udp_transport);
2605 xprt_unregister_transport(&xs_tcp_transport);
2606 xprt_unregister_transport(&xs_bc_tcp_transport);
2609 static int param_set_uint_minmax(const char *val, struct kernel_param *kp,
2610 unsigned int min, unsigned int max)
2617 ret = strict_strtoul(val, 0, &num);
2618 if (ret == -EINVAL || num < min || num > max)
2620 *((unsigned int *)kp->arg) = num;
2624 static int param_set_portnr(const char *val, struct kernel_param *kp)
2626 return param_set_uint_minmax(val, kp,
2631 static int param_get_portnr(char *buffer, struct kernel_param *kp)
2633 return param_get_uint(buffer, kp);
2635 #define param_check_portnr(name, p) \
2636 __param_check(name, p, unsigned int);
2638 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2639 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2641 static int param_set_slot_table_size(const char *val, struct kernel_param *kp)
2643 return param_set_uint_minmax(val, kp,
2645 RPC_MAX_SLOT_TABLE);
2648 static int param_get_slot_table_size(char *buffer, struct kernel_param *kp)
2650 return param_get_uint(buffer, kp);
2652 #define param_check_slot_table_size(name, p) \
2653 __param_check(name, p, unsigned int);
2655 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
2656 slot_table_size, 0644);
2657 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
2658 slot_table_size, 0644);