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 .ctl_name = CTL_SLOTTABLE_UDP,
85 .procname = "udp_slot_table_entries",
86 .data = &xprt_udp_slot_table_entries,
87 .maxlen = sizeof(unsigned int),
89 .proc_handler = &proc_dointvec_minmax,
90 .strategy = &sysctl_intvec,
91 .extra1 = &min_slot_table_size,
92 .extra2 = &max_slot_table_size
95 .ctl_name = CTL_SLOTTABLE_TCP,
96 .procname = "tcp_slot_table_entries",
97 .data = &xprt_tcp_slot_table_entries,
98 .maxlen = sizeof(unsigned int),
100 .proc_handler = &proc_dointvec_minmax,
101 .strategy = &sysctl_intvec,
102 .extra1 = &min_slot_table_size,
103 .extra2 = &max_slot_table_size
106 .ctl_name = CTL_MIN_RESVPORT,
107 .procname = "min_resvport",
108 .data = &xprt_min_resvport,
109 .maxlen = sizeof(unsigned int),
111 .proc_handler = &proc_dointvec_minmax,
112 .strategy = &sysctl_intvec,
113 .extra1 = &xprt_min_resvport_limit,
114 .extra2 = &xprt_max_resvport_limit
117 .ctl_name = CTL_MAX_RESVPORT,
118 .procname = "max_resvport",
119 .data = &xprt_max_resvport,
120 .maxlen = sizeof(unsigned int),
122 .proc_handler = &proc_dointvec_minmax,
123 .strategy = &sysctl_intvec,
124 .extra1 = &xprt_min_resvport_limit,
125 .extra2 = &xprt_max_resvport_limit
128 .procname = "tcp_fin_timeout",
129 .data = &xs_tcp_fin_timeout,
130 .maxlen = sizeof(xs_tcp_fin_timeout),
132 .proc_handler = &proc_dointvec_jiffies,
133 .strategy = sysctl_jiffies
140 static ctl_table sunrpc_table[] = {
142 .ctl_name = CTL_SUNRPC,
143 .procname = "sunrpc",
145 .child = xs_tunables_table
155 * Time out for an RPC UDP socket connect. UDP socket connects are
156 * synchronous, but we set a timeout anyway in case of resource
157 * exhaustion on the local host.
159 #define XS_UDP_CONN_TO (5U * HZ)
162 * Wait duration for an RPC TCP connection to be established. Solaris
163 * NFS over TCP uses 60 seconds, for example, which is in line with how
164 * long a server takes to reboot.
166 #define XS_TCP_CONN_TO (60U * HZ)
169 * Wait duration for a reply from the RPC portmapper.
171 #define XS_BIND_TO (60U * HZ)
174 * Delay if a UDP socket connect error occurs. This is most likely some
175 * kind of resource problem on the local host.
177 #define XS_UDP_REEST_TO (2U * HZ)
180 * The reestablish timeout allows clients to delay for a bit before attempting
181 * to reconnect to a server that just dropped our connection.
183 * We implement an exponential backoff when trying to reestablish a TCP
184 * transport connection with the server. Some servers like to drop a TCP
185 * connection when they are overworked, so we start with a short timeout and
186 * increase over time if the server is down or not responding.
188 #define XS_TCP_INIT_REEST_TO (3U * HZ)
189 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
192 * TCP idle timeout; client drops the transport socket if it is idle
193 * for this long. Note that we also timeout UDP sockets to prevent
194 * holding port numbers when there is no RPC traffic.
196 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
199 # undef RPC_DEBUG_DATA
200 # define RPCDBG_FACILITY RPCDBG_TRANS
203 #ifdef RPC_DEBUG_DATA
204 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
206 u8 *buf = (u8 *) packet;
209 dprintk("RPC: %s\n", msg);
210 for (j = 0; j < count && j < 128; j += 4) {
214 dprintk("0x%04x ", j);
216 dprintk("%02x%02x%02x%02x ",
217 buf[j], buf[j+1], buf[j+2], buf[j+3]);
222 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
229 struct rpc_xprt xprt;
234 struct socket * sock;
238 * State of TCP reply receive
246 unsigned long tcp_copied,
250 * Connection of transports
252 struct delayed_work connect_worker;
253 struct sockaddr_storage srcaddr;
254 unsigned short srcport;
257 * UDP socket buffer size parameters
263 * Saved socket callback addresses
265 void (*old_data_ready)(struct sock *, int);
266 void (*old_state_change)(struct sock *);
267 void (*old_write_space)(struct sock *);
268 void (*old_error_report)(struct sock *);
272 * TCP receive state flags
274 #define TCP_RCV_LAST_FRAG (1UL << 0)
275 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
276 #define TCP_RCV_COPY_XID (1UL << 2)
277 #define TCP_RCV_COPY_DATA (1UL << 3)
278 #define TCP_RCV_READ_CALLDIR (1UL << 4)
279 #define TCP_RCV_COPY_CALLDIR (1UL << 5)
284 #define TCP_RPC_REPLY (1UL << 6)
286 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
288 return (struct sockaddr *) &xprt->addr;
291 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
293 return (struct sockaddr_in *) &xprt->addr;
296 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
298 return (struct sockaddr_in6 *) &xprt->addr;
301 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
303 struct sockaddr *sap = xs_addr(xprt);
304 struct sockaddr_in6 *sin6;
305 struct sockaddr_in *sin;
308 (void)rpc_ntop(sap, buf, sizeof(buf));
309 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
311 switch (sap->sa_family) {
313 sin = xs_addr_in(xprt);
314 (void)snprintf(buf, sizeof(buf), "%02x%02x%02x%02x",
315 NIPQUAD(sin->sin_addr.s_addr));
318 sin6 = xs_addr_in6(xprt);
319 (void)snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
324 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
327 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
329 struct sockaddr *sap = xs_addr(xprt);
332 (void)snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
333 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
335 (void)snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
336 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
339 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
340 const char *protocol,
343 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
344 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
345 xs_format_common_peer_addresses(xprt);
346 xs_format_common_peer_ports(xprt);
349 static void xs_update_peer_port(struct rpc_xprt *xprt)
351 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
352 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
354 xs_format_common_peer_ports(xprt);
357 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
361 for (i = 0; i < RPC_DISPLAY_MAX; i++)
363 case RPC_DISPLAY_PROTO:
364 case RPC_DISPLAY_NETID:
367 kfree(xprt->address_strings[i]);
371 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
373 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
375 struct msghdr msg = {
377 .msg_namelen = addrlen,
378 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
381 .iov_base = vec->iov_base + base,
382 .iov_len = vec->iov_len - base,
385 if (iov.iov_len != 0)
386 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
387 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
390 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
393 unsigned int remainder;
396 remainder = xdr->page_len - base;
397 base += xdr->page_base;
398 ppage = xdr->pages + (base >> PAGE_SHIFT);
401 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
402 int flags = XS_SENDMSG_FLAGS;
405 if (remainder != 0 || more)
407 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
408 if (remainder == 0 || err != len)
422 * xs_sendpages - write pages directly to a socket
423 * @sock: socket to send on
424 * @addr: UDP only -- address of destination
425 * @addrlen: UDP only -- length of destination address
426 * @xdr: buffer containing this request
427 * @base: starting position in the buffer
430 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
432 unsigned int remainder = xdr->len - base;
438 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
444 if (base < xdr->head[0].iov_len || addr != NULL) {
445 unsigned int len = xdr->head[0].iov_len - base;
447 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
448 if (remainder == 0 || err != len)
453 base -= xdr->head[0].iov_len;
455 if (base < xdr->page_len) {
456 unsigned int len = xdr->page_len - base;
458 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
459 if (remainder == 0 || err != len)
464 base -= xdr->page_len;
466 if (base >= xdr->tail[0].iov_len)
468 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
477 static void xs_nospace_callback(struct rpc_task *task)
479 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
481 transport->inet->sk_write_pending--;
482 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
486 * xs_nospace - place task on wait queue if transmit was incomplete
487 * @task: task to put to sleep
490 static int xs_nospace(struct rpc_task *task)
492 struct rpc_rqst *req = task->tk_rqstp;
493 struct rpc_xprt *xprt = req->rq_xprt;
494 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
497 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
498 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
501 /* Protect against races with write_space */
502 spin_lock_bh(&xprt->transport_lock);
504 /* Don't race with disconnect */
505 if (xprt_connected(xprt)) {
506 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
509 * Notify TCP that we're limited by the application
512 set_bit(SOCK_NOSPACE, &transport->sock->flags);
513 transport->inet->sk_write_pending++;
514 /* ...and wait for more buffer space */
515 xprt_wait_for_buffer_space(task, xs_nospace_callback);
518 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
522 spin_unlock_bh(&xprt->transport_lock);
527 * xs_udp_send_request - write an RPC request to a UDP socket
528 * @task: address of RPC task that manages the state of an RPC request
531 * 0: The request has been sent
532 * EAGAIN: The socket was blocked, please call again later to
533 * complete the request
534 * ENOTCONN: Caller needs to invoke connect logic then call again
535 * other: Some other error occured, the request was not sent
537 static int xs_udp_send_request(struct rpc_task *task)
539 struct rpc_rqst *req = task->tk_rqstp;
540 struct rpc_xprt *xprt = req->rq_xprt;
541 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
542 struct xdr_buf *xdr = &req->rq_snd_buf;
545 xs_pktdump("packet data:",
546 req->rq_svec->iov_base,
547 req->rq_svec->iov_len);
549 if (!xprt_bound(xprt))
551 status = xs_sendpages(transport->sock,
556 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
557 xdr->len - req->rq_bytes_sent, status);
560 task->tk_bytes_sent += status;
561 if (status >= req->rq_slen)
563 /* Still some bytes left; set up for a retry later. */
566 if (!transport->sock)
572 /* Should we call xs_close() here? */
575 status = xs_nospace(task);
578 dprintk("RPC: sendmsg returned unrecognized error %d\n",
583 /* When the server has died, an ICMP port unreachable message
584 * prompts ECONNREFUSED. */
585 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
592 * xs_tcp_shutdown - gracefully shut down a TCP socket
595 * Initiates a graceful shutdown of the TCP socket by calling the
596 * equivalent of shutdown(SHUT_WR);
598 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
600 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
601 struct socket *sock = transport->sock;
604 kernel_sock_shutdown(sock, SHUT_WR);
607 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
609 u32 reclen = buf->len - sizeof(rpc_fraghdr);
610 rpc_fraghdr *base = buf->head[0].iov_base;
611 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
615 * xs_tcp_send_request - write an RPC request to a TCP socket
616 * @task: address of RPC task that manages the state of an RPC request
619 * 0: The request has been sent
620 * EAGAIN: The socket was blocked, please call again later to
621 * complete the request
622 * ENOTCONN: Caller needs to invoke connect logic then call again
623 * other: Some other error occured, the request was not sent
625 * XXX: In the case of soft timeouts, should we eventually give up
626 * if sendmsg is not able to make progress?
628 static int xs_tcp_send_request(struct rpc_task *task)
630 struct rpc_rqst *req = task->tk_rqstp;
631 struct rpc_xprt *xprt = req->rq_xprt;
632 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
633 struct xdr_buf *xdr = &req->rq_snd_buf;
636 xs_encode_tcp_record_marker(&req->rq_snd_buf);
638 xs_pktdump("packet data:",
639 req->rq_svec->iov_base,
640 req->rq_svec->iov_len);
642 /* Continue transmitting the packet/record. We must be careful
643 * to cope with writespace callbacks arriving _after_ we have
644 * called sendmsg(). */
646 status = xs_sendpages(transport->sock,
647 NULL, 0, xdr, req->rq_bytes_sent);
649 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
650 xdr->len - req->rq_bytes_sent, status);
652 if (unlikely(status < 0))
655 /* If we've sent the entire packet, immediately
656 * reset the count of bytes sent. */
657 req->rq_bytes_sent += status;
658 task->tk_bytes_sent += status;
659 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
660 req->rq_bytes_sent = 0;
669 if (!transport->sock)
675 /* Should we call xs_close() here? */
678 status = xs_nospace(task);
681 dprintk("RPC: sendmsg returned unrecognized error %d\n",
685 xs_tcp_shutdown(xprt);
688 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
695 * xs_tcp_release_xprt - clean up after a tcp transmission
699 * This cleans up if an error causes us to abort the transmission of a request.
700 * In this case, the socket may need to be reset in order to avoid confusing
703 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
705 struct rpc_rqst *req;
707 if (task != xprt->snd_task)
711 req = task->tk_rqstp;
712 if (req->rq_bytes_sent == 0)
714 if (req->rq_bytes_sent == req->rq_snd_buf.len)
716 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
718 xprt_release_xprt(xprt, task);
721 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
723 transport->old_data_ready = sk->sk_data_ready;
724 transport->old_state_change = sk->sk_state_change;
725 transport->old_write_space = sk->sk_write_space;
726 transport->old_error_report = sk->sk_error_report;
729 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
731 sk->sk_data_ready = transport->old_data_ready;
732 sk->sk_state_change = transport->old_state_change;
733 sk->sk_write_space = transport->old_write_space;
734 sk->sk_error_report = transport->old_error_report;
737 static void xs_reset_transport(struct sock_xprt *transport)
739 struct socket *sock = transport->sock;
740 struct sock *sk = transport->inet;
745 write_lock_bh(&sk->sk_callback_lock);
746 transport->inet = NULL;
747 transport->sock = NULL;
749 sk->sk_user_data = NULL;
751 xs_restore_old_callbacks(transport, sk);
752 write_unlock_bh(&sk->sk_callback_lock);
760 * xs_close - close a socket
763 * This is used when all requests are complete; ie, no DRC state remains
764 * on the server we want to save.
766 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
767 * xs_reset_transport() zeroing the socket from underneath a writer.
769 static void xs_close(struct rpc_xprt *xprt)
771 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
773 dprintk("RPC: xs_close xprt %p\n", xprt);
775 xs_reset_transport(transport);
777 smp_mb__before_clear_bit();
778 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
779 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
780 clear_bit(XPRT_CLOSING, &xprt->state);
781 smp_mb__after_clear_bit();
782 xprt_disconnect_done(xprt);
785 static void xs_tcp_close(struct rpc_xprt *xprt)
787 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
790 xs_tcp_shutdown(xprt);
794 * xs_destroy - prepare to shutdown a transport
795 * @xprt: doomed transport
798 static void xs_destroy(struct rpc_xprt *xprt)
800 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
802 dprintk("RPC: xs_destroy xprt %p\n", xprt);
804 cancel_rearming_delayed_work(&transport->connect_worker);
807 xs_free_peer_addresses(xprt);
810 module_put(THIS_MODULE);
813 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
815 return (struct rpc_xprt *) sk->sk_user_data;
819 * xs_udp_data_ready - "data ready" callback for UDP sockets
820 * @sk: socket with data to read
821 * @len: how much data to read
824 static void xs_udp_data_ready(struct sock *sk, int len)
826 struct rpc_task *task;
827 struct rpc_xprt *xprt;
828 struct rpc_rqst *rovr;
830 int err, repsize, copied;
834 read_lock(&sk->sk_callback_lock);
835 dprintk("RPC: xs_udp_data_ready...\n");
836 if (!(xprt = xprt_from_sock(sk)))
839 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
845 repsize = skb->len - sizeof(struct udphdr);
847 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
851 /* Copy the XID from the skb... */
852 xp = skb_header_pointer(skb, sizeof(struct udphdr),
853 sizeof(_xid), &_xid);
857 /* Look up and lock the request corresponding to the given XID */
858 spin_lock(&xprt->transport_lock);
859 rovr = xprt_lookup_rqst(xprt, *xp);
862 task = rovr->rq_task;
864 if ((copied = rovr->rq_private_buf.buflen) > repsize)
867 /* Suck it into the iovec, verify checksum if not done by hw. */
868 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
869 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
873 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
875 /* Something worked... */
876 dst_confirm(skb_dst(skb));
878 xprt_adjust_cwnd(task, copied);
879 xprt_update_rtt(task);
880 xprt_complete_rqst(task, copied);
883 spin_unlock(&xprt->transport_lock);
885 skb_free_datagram(sk, skb);
887 read_unlock(&sk->sk_callback_lock);
890 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
892 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
896 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
897 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
898 used = xdr_skb_read_bits(desc, p, len);
899 transport->tcp_offset += used;
903 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
904 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
905 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
907 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
908 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
910 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
911 transport->tcp_offset = 0;
913 /* Sanity check of the record length */
914 if (unlikely(transport->tcp_reclen < 8)) {
915 dprintk("RPC: invalid TCP record fragment length\n");
916 xprt_force_disconnect(xprt);
919 dprintk("RPC: reading TCP record fragment of length %d\n",
920 transport->tcp_reclen);
923 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
925 if (transport->tcp_offset == transport->tcp_reclen) {
926 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
927 transport->tcp_offset = 0;
928 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
929 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
930 transport->tcp_flags |= TCP_RCV_COPY_XID;
931 transport->tcp_copied = 0;
936 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
941 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
942 dprintk("RPC: reading XID (%Zu bytes)\n", len);
943 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
944 used = xdr_skb_read_bits(desc, p, len);
945 transport->tcp_offset += used;
948 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
949 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
950 transport->tcp_copied = 4;
951 dprintk("RPC: reading %s XID %08x\n",
952 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
954 ntohl(transport->tcp_xid));
955 xs_tcp_check_fraghdr(transport);
958 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
959 struct xdr_skb_reader *desc)
966 * We want transport->tcp_offset to be 8 at the end of this routine
967 * (4 bytes for the xid and 4 bytes for the call/reply flag).
968 * When this function is called for the first time,
969 * transport->tcp_offset is 4 (after having already read the xid).
971 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
972 len = sizeof(calldir) - offset;
973 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
974 used = xdr_skb_read_bits(desc, &calldir, len);
975 transport->tcp_offset += used;
978 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
979 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
980 transport->tcp_flags |= TCP_RCV_COPY_DATA;
982 * We don't yet have the XDR buffer, so we will write the calldir
983 * out after we get the buffer from the 'struct rpc_rqst'
985 if (ntohl(calldir) == RPC_REPLY)
986 transport->tcp_flags |= TCP_RPC_REPLY;
988 transport->tcp_flags &= ~TCP_RPC_REPLY;
989 dprintk("RPC: reading %s CALL/REPLY flag %08x\n",
990 (transport->tcp_flags & TCP_RPC_REPLY) ?
991 "reply for" : "request with", calldir);
992 xs_tcp_check_fraghdr(transport);
995 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
996 struct xdr_skb_reader *desc,
997 struct rpc_rqst *req)
999 struct sock_xprt *transport =
1000 container_of(xprt, struct sock_xprt, xprt);
1001 struct xdr_buf *rcvbuf;
1005 rcvbuf = &req->rq_private_buf;
1007 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1009 * Save the RPC direction in the XDR buffer
1011 __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ?
1012 htonl(RPC_REPLY) : 0;
1014 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1015 &calldir, sizeof(calldir));
1016 transport->tcp_copied += sizeof(calldir);
1017 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1021 if (len > transport->tcp_reclen - transport->tcp_offset) {
1022 struct xdr_skb_reader my_desc;
1024 len = transport->tcp_reclen - transport->tcp_offset;
1025 memcpy(&my_desc, desc, sizeof(my_desc));
1026 my_desc.count = len;
1027 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1028 &my_desc, xdr_skb_read_bits);
1032 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1033 desc, xdr_skb_read_bits);
1036 transport->tcp_copied += r;
1037 transport->tcp_offset += r;
1040 /* Error when copying to the receive buffer,
1041 * usually because we weren't able to allocate
1042 * additional buffer pages. All we can do now
1043 * is turn off TCP_RCV_COPY_DATA, so the request
1044 * will not receive any additional updates,
1046 * Any remaining data from this record will
1049 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1050 dprintk("RPC: XID %08x truncated request\n",
1051 ntohl(transport->tcp_xid));
1052 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1053 "tcp_offset = %u, tcp_reclen = %u\n",
1054 xprt, transport->tcp_copied,
1055 transport->tcp_offset, transport->tcp_reclen);
1059 dprintk("RPC: XID %08x read %Zd bytes\n",
1060 ntohl(transport->tcp_xid), r);
1061 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1062 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1063 transport->tcp_offset, transport->tcp_reclen);
1065 if (transport->tcp_copied == req->rq_private_buf.buflen)
1066 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1067 else if (transport->tcp_offset == transport->tcp_reclen) {
1068 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1069 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1076 * Finds the request corresponding to the RPC xid and invokes the common
1077 * tcp read code to read the data.
1079 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1080 struct xdr_skb_reader *desc)
1082 struct sock_xprt *transport =
1083 container_of(xprt, struct sock_xprt, xprt);
1084 struct rpc_rqst *req;
1086 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1088 /* Find and lock the request corresponding to this xid */
1089 spin_lock(&xprt->transport_lock);
1090 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1092 dprintk("RPC: XID %08x request not found!\n",
1093 ntohl(transport->tcp_xid));
1094 spin_unlock(&xprt->transport_lock);
1098 xs_tcp_read_common(xprt, desc, req);
1100 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1101 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1103 spin_unlock(&xprt->transport_lock);
1107 #if defined(CONFIG_NFS_V4_1)
1109 * Obtains an rpc_rqst previously allocated and invokes the common
1110 * tcp read code to read the data. The result is placed in the callback
1112 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1113 * connection and return -1.
1115 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1116 struct xdr_skb_reader *desc)
1118 struct sock_xprt *transport =
1119 container_of(xprt, struct sock_xprt, xprt);
1120 struct rpc_rqst *req;
1122 req = xprt_alloc_bc_request(xprt);
1124 printk(KERN_WARNING "Callback slot table overflowed\n");
1125 xprt_force_disconnect(xprt);
1129 req->rq_xid = transport->tcp_xid;
1130 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1131 xs_tcp_read_common(xprt, desc, req);
1133 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1134 struct svc_serv *bc_serv = xprt->bc_serv;
1137 * Add callback request to callback list. The callback
1138 * service sleeps on the sv_cb_waitq waiting for new
1139 * requests. Wake it up after adding enqueing the
1142 dprintk("RPC: add callback request to list\n");
1143 spin_lock(&bc_serv->sv_cb_lock);
1144 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1145 spin_unlock(&bc_serv->sv_cb_lock);
1146 wake_up(&bc_serv->sv_cb_waitq);
1149 req->rq_private_buf.len = transport->tcp_copied;
1154 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1155 struct xdr_skb_reader *desc)
1157 struct sock_xprt *transport =
1158 container_of(xprt, struct sock_xprt, xprt);
1160 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1161 xs_tcp_read_reply(xprt, desc) :
1162 xs_tcp_read_callback(xprt, desc);
1165 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1166 struct xdr_skb_reader *desc)
1168 return xs_tcp_read_reply(xprt, desc);
1170 #endif /* CONFIG_NFS_V4_1 */
1173 * Read data off the transport. This can be either an RPC_CALL or an
1174 * RPC_REPLY. Relay the processing to helper functions.
1176 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1177 struct xdr_skb_reader *desc)
1179 struct sock_xprt *transport =
1180 container_of(xprt, struct sock_xprt, xprt);
1182 if (_xs_tcp_read_data(xprt, desc) == 0)
1183 xs_tcp_check_fraghdr(transport);
1186 * The transport_lock protects the request handling.
1187 * There's no need to hold it to update the tcp_flags.
1189 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1193 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1197 len = transport->tcp_reclen - transport->tcp_offset;
1198 if (len > desc->count)
1201 desc->offset += len;
1202 transport->tcp_offset += len;
1203 dprintk("RPC: discarded %Zu bytes\n", len);
1204 xs_tcp_check_fraghdr(transport);
1207 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1209 struct rpc_xprt *xprt = rd_desc->arg.data;
1210 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1211 struct xdr_skb_reader desc = {
1217 dprintk("RPC: xs_tcp_data_recv started\n");
1219 /* Read in a new fragment marker if necessary */
1220 /* Can we ever really expect to get completely empty fragments? */
1221 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1222 xs_tcp_read_fraghdr(xprt, &desc);
1225 /* Read in the xid if necessary */
1226 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1227 xs_tcp_read_xid(transport, &desc);
1230 /* Read in the call/reply flag */
1231 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1232 xs_tcp_read_calldir(transport, &desc);
1235 /* Read in the request data */
1236 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1237 xs_tcp_read_data(xprt, &desc);
1240 /* Skip over any trailing bytes on short reads */
1241 xs_tcp_read_discard(transport, &desc);
1242 } while (desc.count);
1243 dprintk("RPC: xs_tcp_data_recv done\n");
1244 return len - desc.count;
1248 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1249 * @sk: socket with data to read
1250 * @bytes: how much data to read
1253 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1255 struct rpc_xprt *xprt;
1256 read_descriptor_t rd_desc;
1259 dprintk("RPC: xs_tcp_data_ready...\n");
1261 read_lock(&sk->sk_callback_lock);
1262 if (!(xprt = xprt_from_sock(sk)))
1267 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1268 rd_desc.arg.data = xprt;
1270 rd_desc.count = 65536;
1271 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1274 read_unlock(&sk->sk_callback_lock);
1278 * Do the equivalent of linger/linger2 handling for dealing with
1279 * broken servers that don't close the socket in a timely
1282 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1283 unsigned long timeout)
1285 struct sock_xprt *transport;
1287 if (xprt_test_and_set_connecting(xprt))
1289 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1290 transport = container_of(xprt, struct sock_xprt, xprt);
1291 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1295 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1297 struct sock_xprt *transport;
1299 transport = container_of(xprt, struct sock_xprt, xprt);
1301 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1302 !cancel_delayed_work(&transport->connect_worker))
1304 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1305 xprt_clear_connecting(xprt);
1308 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1310 smp_mb__before_clear_bit();
1311 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1312 clear_bit(XPRT_CLOSING, &xprt->state);
1313 smp_mb__after_clear_bit();
1314 /* Mark transport as closed and wake up all pending tasks */
1315 xprt_disconnect_done(xprt);
1319 * xs_tcp_state_change - callback to handle TCP socket state changes
1320 * @sk: socket whose state has changed
1323 static void xs_tcp_state_change(struct sock *sk)
1325 struct rpc_xprt *xprt;
1327 read_lock(&sk->sk_callback_lock);
1328 if (!(xprt = xprt_from_sock(sk)))
1330 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1331 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1332 sk->sk_state, xprt_connected(xprt),
1333 sock_flag(sk, SOCK_DEAD),
1334 sock_flag(sk, SOCK_ZAPPED));
1336 switch (sk->sk_state) {
1337 case TCP_ESTABLISHED:
1338 spin_lock_bh(&xprt->transport_lock);
1339 if (!xprt_test_and_set_connected(xprt)) {
1340 struct sock_xprt *transport = container_of(xprt,
1341 struct sock_xprt, xprt);
1343 /* Reset TCP record info */
1344 transport->tcp_offset = 0;
1345 transport->tcp_reclen = 0;
1346 transport->tcp_copied = 0;
1347 transport->tcp_flags =
1348 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1350 xprt_wake_pending_tasks(xprt, -EAGAIN);
1352 spin_unlock_bh(&xprt->transport_lock);
1355 /* The client initiated a shutdown of the socket */
1356 xprt->connect_cookie++;
1357 xprt->reestablish_timeout = 0;
1358 set_bit(XPRT_CLOSING, &xprt->state);
1359 smp_mb__before_clear_bit();
1360 clear_bit(XPRT_CONNECTED, &xprt->state);
1361 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1362 smp_mb__after_clear_bit();
1363 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1365 case TCP_CLOSE_WAIT:
1366 /* The server initiated a shutdown of the socket */
1367 xprt_force_disconnect(xprt);
1369 xprt->connect_cookie++;
1372 * If the server closed down the connection, make sure that
1373 * we back off before reconnecting
1375 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1376 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1379 set_bit(XPRT_CLOSING, &xprt->state);
1380 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1381 smp_mb__before_clear_bit();
1382 clear_bit(XPRT_CONNECTED, &xprt->state);
1383 smp_mb__after_clear_bit();
1386 xs_tcp_cancel_linger_timeout(xprt);
1387 xs_sock_mark_closed(xprt);
1390 read_unlock(&sk->sk_callback_lock);
1394 * xs_error_report - callback mainly for catching socket errors
1397 static void xs_error_report(struct sock *sk)
1399 struct rpc_xprt *xprt;
1401 read_lock(&sk->sk_callback_lock);
1402 if (!(xprt = xprt_from_sock(sk)))
1404 dprintk("RPC: %s client %p...\n"
1406 __func__, xprt, sk->sk_err);
1407 xprt_wake_pending_tasks(xprt, -EAGAIN);
1409 read_unlock(&sk->sk_callback_lock);
1412 static void xs_write_space(struct sock *sk)
1414 struct socket *sock;
1415 struct rpc_xprt *xprt;
1417 if (unlikely(!(sock = sk->sk_socket)))
1419 clear_bit(SOCK_NOSPACE, &sock->flags);
1421 if (unlikely(!(xprt = xprt_from_sock(sk))))
1423 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1426 xprt_write_space(xprt);
1430 * xs_udp_write_space - callback invoked when socket buffer space
1432 * @sk: socket whose state has changed
1434 * Called when more output buffer space is available for this socket.
1435 * We try not to wake our writers until they can make "significant"
1436 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1437 * with a bunch of small requests.
1439 static void xs_udp_write_space(struct sock *sk)
1441 read_lock(&sk->sk_callback_lock);
1443 /* from net/core/sock.c:sock_def_write_space */
1444 if (sock_writeable(sk))
1447 read_unlock(&sk->sk_callback_lock);
1451 * xs_tcp_write_space - callback invoked when socket buffer space
1453 * @sk: socket whose state has changed
1455 * Called when more output buffer space is available for this socket.
1456 * We try not to wake our writers until they can make "significant"
1457 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1458 * with a bunch of small requests.
1460 static void xs_tcp_write_space(struct sock *sk)
1462 read_lock(&sk->sk_callback_lock);
1464 /* from net/core/stream.c:sk_stream_write_space */
1465 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1468 read_unlock(&sk->sk_callback_lock);
1471 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1473 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1474 struct sock *sk = transport->inet;
1476 if (transport->rcvsize) {
1477 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1478 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1480 if (transport->sndsize) {
1481 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1482 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1483 sk->sk_write_space(sk);
1488 * xs_udp_set_buffer_size - set send and receive limits
1489 * @xprt: generic transport
1490 * @sndsize: requested size of send buffer, in bytes
1491 * @rcvsize: requested size of receive buffer, in bytes
1493 * Set socket send and receive buffer size limits.
1495 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1497 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1499 transport->sndsize = 0;
1501 transport->sndsize = sndsize + 1024;
1502 transport->rcvsize = 0;
1504 transport->rcvsize = rcvsize + 1024;
1506 xs_udp_do_set_buffer_size(xprt);
1510 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1511 * @task: task that timed out
1513 * Adjust the congestion window after a retransmit timeout has occurred.
1515 static void xs_udp_timer(struct rpc_task *task)
1517 xprt_adjust_cwnd(task, -ETIMEDOUT);
1520 static unsigned short xs_get_random_port(void)
1522 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1523 unsigned short rand = (unsigned short) net_random() % range;
1524 return rand + xprt_min_resvport;
1528 * xs_set_port - reset the port number in the remote endpoint address
1529 * @xprt: generic transport
1530 * @port: new port number
1533 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1535 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1537 rpc_set_port(xs_addr(xprt), port);
1538 xs_update_peer_port(xprt);
1541 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1543 unsigned short port = transport->srcport;
1545 if (port == 0 && transport->xprt.resvport)
1546 port = xs_get_random_port();
1550 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1552 if (transport->srcport != 0)
1553 transport->srcport = 0;
1554 if (!transport->xprt.resvport)
1556 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1557 return xprt_max_resvport;
1561 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1563 struct sockaddr_in myaddr = {
1564 .sin_family = AF_INET,
1566 struct sockaddr_in *sa;
1568 unsigned short port = xs_get_srcport(transport, sock);
1569 unsigned short last;
1571 sa = (struct sockaddr_in *)&transport->srcaddr;
1572 myaddr.sin_addr = sa->sin_addr;
1574 myaddr.sin_port = htons(port);
1575 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1580 transport->srcport = port;
1584 port = xs_next_srcport(transport, sock, port);
1587 } while (err == -EADDRINUSE && nloop != 2);
1588 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1589 __func__, &myaddr.sin_addr,
1590 port, err ? "failed" : "ok", err);
1594 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1596 struct sockaddr_in6 myaddr = {
1597 .sin6_family = AF_INET6,
1599 struct sockaddr_in6 *sa;
1601 unsigned short port = xs_get_srcport(transport, sock);
1602 unsigned short last;
1604 sa = (struct sockaddr_in6 *)&transport->srcaddr;
1605 myaddr.sin6_addr = sa->sin6_addr;
1607 myaddr.sin6_port = htons(port);
1608 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1613 transport->srcport = port;
1617 port = xs_next_srcport(transport, sock, port);
1620 } while (err == -EADDRINUSE && nloop != 2);
1621 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1622 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1626 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1627 static struct lock_class_key xs_key[2];
1628 static struct lock_class_key xs_slock_key[2];
1630 static inline void xs_reclassify_socket4(struct socket *sock)
1632 struct sock *sk = sock->sk;
1634 BUG_ON(sock_owned_by_user(sk));
1635 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1636 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1639 static inline void xs_reclassify_socket6(struct socket *sock)
1641 struct sock *sk = sock->sk;
1643 BUG_ON(sock_owned_by_user(sk));
1644 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1645 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1648 static inline void xs_reclassify_socket4(struct socket *sock)
1652 static inline void xs_reclassify_socket6(struct socket *sock)
1657 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1659 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1661 if (!transport->inet) {
1662 struct sock *sk = sock->sk;
1664 write_lock_bh(&sk->sk_callback_lock);
1666 xs_save_old_callbacks(transport, sk);
1668 sk->sk_user_data = xprt;
1669 sk->sk_data_ready = xs_udp_data_ready;
1670 sk->sk_write_space = xs_udp_write_space;
1671 sk->sk_error_report = xs_error_report;
1672 sk->sk_no_check = UDP_CSUM_NORCV;
1673 sk->sk_allocation = GFP_ATOMIC;
1675 xprt_set_connected(xprt);
1677 /* Reset to new socket */
1678 transport->sock = sock;
1679 transport->inet = sk;
1681 write_unlock_bh(&sk->sk_callback_lock);
1683 xs_udp_do_set_buffer_size(xprt);
1687 * xs_udp_connect_worker4 - set up a UDP socket
1688 * @work: RPC transport to connect
1690 * Invoked by a work queue tasklet.
1692 static void xs_udp_connect_worker4(struct work_struct *work)
1694 struct sock_xprt *transport =
1695 container_of(work, struct sock_xprt, connect_worker.work);
1696 struct rpc_xprt *xprt = &transport->xprt;
1697 struct socket *sock = transport->sock;
1698 int err, status = -EIO;
1703 /* Start by resetting any existing state */
1704 xs_reset_transport(transport);
1706 err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1708 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1711 xs_reclassify_socket4(sock);
1713 if (xs_bind4(transport, sock)) {
1718 dprintk("RPC: worker connecting xprt %p via %s to "
1719 "%s (port %s)\n", xprt,
1720 xprt->address_strings[RPC_DISPLAY_PROTO],
1721 xprt->address_strings[RPC_DISPLAY_ADDR],
1722 xprt->address_strings[RPC_DISPLAY_PORT]);
1724 xs_udp_finish_connecting(xprt, sock);
1727 xprt_clear_connecting(xprt);
1728 xprt_wake_pending_tasks(xprt, status);
1732 * xs_udp_connect_worker6 - set up a UDP socket
1733 * @work: RPC transport to connect
1735 * Invoked by a work queue tasklet.
1737 static void xs_udp_connect_worker6(struct work_struct *work)
1739 struct sock_xprt *transport =
1740 container_of(work, struct sock_xprt, connect_worker.work);
1741 struct rpc_xprt *xprt = &transport->xprt;
1742 struct socket *sock = transport->sock;
1743 int err, status = -EIO;
1748 /* Start by resetting any existing state */
1749 xs_reset_transport(transport);
1751 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
1753 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1756 xs_reclassify_socket6(sock);
1758 if (xs_bind6(transport, sock) < 0) {
1763 dprintk("RPC: worker connecting xprt %p via %s to "
1764 "%s (port %s)\n", xprt,
1765 xprt->address_strings[RPC_DISPLAY_PROTO],
1766 xprt->address_strings[RPC_DISPLAY_ADDR],
1767 xprt->address_strings[RPC_DISPLAY_PORT]);
1769 xs_udp_finish_connecting(xprt, sock);
1772 xprt_clear_connecting(xprt);
1773 xprt_wake_pending_tasks(xprt, status);
1777 * We need to preserve the port number so the reply cache on the server can
1778 * find our cached RPC replies when we get around to reconnecting.
1780 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1783 struct sockaddr any;
1785 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1788 * Disconnect the transport socket by doing a connect operation
1789 * with AF_UNSPEC. This should return immediately...
1791 memset(&any, 0, sizeof(any));
1792 any.sa_family = AF_UNSPEC;
1793 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1795 xs_sock_mark_closed(xprt);
1797 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1801 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1803 unsigned int state = transport->inet->sk_state;
1805 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED)
1807 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT))
1809 xs_abort_connection(xprt, transport);
1812 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1814 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1816 if (!transport->inet) {
1817 struct sock *sk = sock->sk;
1819 write_lock_bh(&sk->sk_callback_lock);
1821 xs_save_old_callbacks(transport, sk);
1823 sk->sk_user_data = xprt;
1824 sk->sk_data_ready = xs_tcp_data_ready;
1825 sk->sk_state_change = xs_tcp_state_change;
1826 sk->sk_write_space = xs_tcp_write_space;
1827 sk->sk_error_report = xs_error_report;
1828 sk->sk_allocation = GFP_ATOMIC;
1830 /* socket options */
1831 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1832 sock_reset_flag(sk, SOCK_LINGER);
1833 tcp_sk(sk)->linger2 = 0;
1834 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1836 xprt_clear_connected(xprt);
1838 /* Reset to new socket */
1839 transport->sock = sock;
1840 transport->inet = sk;
1842 write_unlock_bh(&sk->sk_callback_lock);
1845 if (!xprt_bound(xprt))
1848 /* Tell the socket layer to start connecting... */
1849 xprt->stat.connect_count++;
1850 xprt->stat.connect_start = jiffies;
1851 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1855 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
1856 * @xprt: RPC transport to connect
1857 * @transport: socket transport to connect
1858 * @create_sock: function to create a socket of the correct type
1860 * Invoked by a work queue tasklet.
1862 static void xs_tcp_setup_socket(struct rpc_xprt *xprt,
1863 struct sock_xprt *transport,
1864 struct socket *(*create_sock)(struct rpc_xprt *,
1865 struct sock_xprt *))
1867 struct socket *sock = transport->sock;
1874 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1875 sock = create_sock(xprt, transport);
1877 status = PTR_ERR(sock);
1883 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
1885 /* "close" the socket, preserving the local port */
1886 xs_tcp_reuse_connection(xprt, transport);
1892 dprintk("RPC: worker connecting xprt %p via %s to "
1893 "%s (port %s)\n", xprt,
1894 xprt->address_strings[RPC_DISPLAY_PROTO],
1895 xprt->address_strings[RPC_DISPLAY_ADDR],
1896 xprt->address_strings[RPC_DISPLAY_PORT]);
1898 status = xs_tcp_finish_connecting(xprt, sock);
1899 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1900 xprt, -status, xprt_connected(xprt),
1901 sock->sk->sk_state);
1904 printk("%s: connect returned unhandled error %d\n",
1906 case -EADDRNOTAVAIL:
1907 /* We're probably in TIME_WAIT. Get rid of existing socket,
1910 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1911 xprt_force_disconnect(xprt);
1916 /* retry with existing socket, after a delay */
1920 xprt_clear_connecting(xprt);
1926 xprt_clear_connecting(xprt);
1927 xprt_wake_pending_tasks(xprt, status);
1930 static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt,
1931 struct sock_xprt *transport)
1933 struct socket *sock;
1936 /* start from scratch */
1937 err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1939 dprintk("RPC: can't create TCP transport socket (%d).\n",
1943 xs_reclassify_socket4(sock);
1945 if (xs_bind4(transport, sock) < 0) {
1951 return ERR_PTR(-EIO);
1955 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1956 * @work: RPC transport to connect
1958 * Invoked by a work queue tasklet.
1960 static void xs_tcp_connect_worker4(struct work_struct *work)
1962 struct sock_xprt *transport =
1963 container_of(work, struct sock_xprt, connect_worker.work);
1964 struct rpc_xprt *xprt = &transport->xprt;
1966 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4);
1969 static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt,
1970 struct sock_xprt *transport)
1972 struct socket *sock;
1975 /* start from scratch */
1976 err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock);
1978 dprintk("RPC: can't create TCP transport socket (%d).\n",
1982 xs_reclassify_socket6(sock);
1984 if (xs_bind6(transport, sock) < 0) {
1990 return ERR_PTR(-EIO);
1994 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1995 * @work: RPC transport to connect
1997 * Invoked by a work queue tasklet.
1999 static void xs_tcp_connect_worker6(struct work_struct *work)
2001 struct sock_xprt *transport =
2002 container_of(work, struct sock_xprt, connect_worker.work);
2003 struct rpc_xprt *xprt = &transport->xprt;
2005 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6);
2009 * xs_connect - connect a socket to a remote endpoint
2010 * @task: address of RPC task that manages state of connect request
2012 * TCP: If the remote end dropped the connection, delay reconnecting.
2014 * UDP socket connects are synchronous, but we use a work queue anyway
2015 * to guarantee that even unprivileged user processes can set up a
2016 * socket on a privileged port.
2018 * If a UDP socket connect fails, the delay behavior here prevents
2019 * retry floods (hard mounts).
2021 static void xs_connect(struct rpc_task *task)
2023 struct rpc_xprt *xprt = task->tk_xprt;
2024 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2026 if (xprt_test_and_set_connecting(xprt))
2029 if (transport->sock != NULL) {
2030 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2032 xprt, xprt->reestablish_timeout / HZ);
2033 queue_delayed_work(rpciod_workqueue,
2034 &transport->connect_worker,
2035 xprt->reestablish_timeout);
2036 xprt->reestablish_timeout <<= 1;
2037 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2038 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2040 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2041 queue_delayed_work(rpciod_workqueue,
2042 &transport->connect_worker, 0);
2046 static void xs_tcp_connect(struct rpc_task *task)
2048 struct rpc_xprt *xprt = task->tk_xprt;
2050 /* Exit if we need to wait for socket shutdown to complete */
2051 if (test_bit(XPRT_CLOSING, &xprt->state))
2057 * xs_udp_print_stats - display UDP socket-specifc stats
2058 * @xprt: rpc_xprt struct containing statistics
2062 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2064 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2066 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
2068 xprt->stat.bind_count,
2071 xprt->stat.bad_xids,
2073 xprt->stat.bklog_u);
2077 * xs_tcp_print_stats - display TCP socket-specifc stats
2078 * @xprt: rpc_xprt struct containing statistics
2082 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2084 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2087 if (xprt_connected(xprt))
2088 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2090 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
2092 xprt->stat.bind_count,
2093 xprt->stat.connect_count,
2094 xprt->stat.connect_time,
2098 xprt->stat.bad_xids,
2100 xprt->stat.bklog_u);
2104 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2105 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2106 * to use the server side send routines.
2108 void *bc_malloc(struct rpc_task *task, size_t size)
2111 struct rpc_buffer *buf;
2113 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2114 page = alloc_page(GFP_KERNEL);
2119 buf = page_address(page);
2120 buf->len = PAGE_SIZE;
2126 * Free the space allocated in the bc_alloc routine
2128 void bc_free(void *buffer)
2130 struct rpc_buffer *buf;
2135 buf = container_of(buffer, struct rpc_buffer, data);
2136 free_page((unsigned long)buf);
2140 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2141 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2143 static int bc_sendto(struct rpc_rqst *req)
2146 struct xdr_buf *xbufp = &req->rq_snd_buf;
2147 struct rpc_xprt *xprt = req->rq_xprt;
2148 struct sock_xprt *transport =
2149 container_of(xprt, struct sock_xprt, xprt);
2150 struct socket *sock = transport->sock;
2151 unsigned long headoff;
2152 unsigned long tailoff;
2155 * Set up the rpc header and record marker stuff
2157 xs_encode_tcp_record_marker(xbufp);
2159 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2160 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2161 len = svc_send_common(sock, xbufp,
2162 virt_to_page(xbufp->head[0].iov_base), headoff,
2163 xbufp->tail[0].iov_base, tailoff);
2165 if (len != xbufp->len) {
2166 printk(KERN_NOTICE "Error sending entire callback!\n");
2174 * The send routine. Borrows from svc_send
2176 static int bc_send_request(struct rpc_task *task)
2178 struct rpc_rqst *req = task->tk_rqstp;
2179 struct svc_xprt *xprt;
2180 struct svc_sock *svsk;
2183 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2185 * Get the server socket associated with this callback xprt
2187 xprt = req->rq_xprt->bc_xprt;
2188 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2191 * Grab the mutex to serialize data as the connection is shared
2192 * with the fore channel
2194 if (!mutex_trylock(&xprt->xpt_mutex)) {
2195 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2196 if (!mutex_trylock(&xprt->xpt_mutex))
2198 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2200 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2203 len = bc_sendto(req);
2204 mutex_unlock(&xprt->xpt_mutex);
2213 * The close routine. Since this is client initiated, we do nothing
2216 static void bc_close(struct rpc_xprt *xprt)
2222 * The xprt destroy routine. Again, because this connection is client
2223 * initiated, we do nothing
2226 static void bc_destroy(struct rpc_xprt *xprt)
2231 static struct rpc_xprt_ops xs_udp_ops = {
2232 .set_buffer_size = xs_udp_set_buffer_size,
2233 .reserve_xprt = xprt_reserve_xprt_cong,
2234 .release_xprt = xprt_release_xprt_cong,
2235 .rpcbind = rpcb_getport_async,
2236 .set_port = xs_set_port,
2237 .connect = xs_connect,
2238 .buf_alloc = rpc_malloc,
2239 .buf_free = rpc_free,
2240 .send_request = xs_udp_send_request,
2241 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2242 .timer = xs_udp_timer,
2243 .release_request = xprt_release_rqst_cong,
2245 .destroy = xs_destroy,
2246 .print_stats = xs_udp_print_stats,
2249 static struct rpc_xprt_ops xs_tcp_ops = {
2250 .reserve_xprt = xprt_reserve_xprt,
2251 .release_xprt = xs_tcp_release_xprt,
2252 .rpcbind = rpcb_getport_async,
2253 .set_port = xs_set_port,
2254 .connect = xs_tcp_connect,
2255 .buf_alloc = rpc_malloc,
2256 .buf_free = rpc_free,
2257 .send_request = xs_tcp_send_request,
2258 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2259 #if defined(CONFIG_NFS_V4_1)
2260 .release_request = bc_release_request,
2261 #endif /* CONFIG_NFS_V4_1 */
2262 .close = xs_tcp_close,
2263 .destroy = xs_destroy,
2264 .print_stats = xs_tcp_print_stats,
2268 * The rpc_xprt_ops for the server backchannel
2271 static struct rpc_xprt_ops bc_tcp_ops = {
2272 .reserve_xprt = xprt_reserve_xprt,
2273 .release_xprt = xprt_release_xprt,
2274 .buf_alloc = bc_malloc,
2275 .buf_free = bc_free,
2276 .send_request = bc_send_request,
2277 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2279 .destroy = bc_destroy,
2280 .print_stats = xs_tcp_print_stats,
2283 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2284 unsigned int slot_table_size)
2286 struct rpc_xprt *xprt;
2287 struct sock_xprt *new;
2289 if (args->addrlen > sizeof(xprt->addr)) {
2290 dprintk("RPC: xs_setup_xprt: address too large\n");
2291 return ERR_PTR(-EBADF);
2294 new = kzalloc(sizeof(*new), GFP_KERNEL);
2296 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2298 return ERR_PTR(-ENOMEM);
2302 xprt->max_reqs = slot_table_size;
2303 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
2304 if (xprt->slot == NULL) {
2306 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
2308 return ERR_PTR(-ENOMEM);
2311 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2312 xprt->addrlen = args->addrlen;
2314 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2319 static const struct rpc_timeout xs_udp_default_timeout = {
2320 .to_initval = 5 * HZ,
2321 .to_maxval = 30 * HZ,
2322 .to_increment = 5 * HZ,
2327 * xs_setup_udp - Set up transport to use a UDP socket
2328 * @args: rpc transport creation arguments
2331 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2333 struct sockaddr *addr = args->dstaddr;
2334 struct rpc_xprt *xprt;
2335 struct sock_xprt *transport;
2337 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
2340 transport = container_of(xprt, struct sock_xprt, xprt);
2342 xprt->prot = IPPROTO_UDP;
2344 /* XXX: header size can vary due to auth type, IPv6, etc. */
2345 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2347 xprt->bind_timeout = XS_BIND_TO;
2348 xprt->connect_timeout = XS_UDP_CONN_TO;
2349 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2350 xprt->idle_timeout = XS_IDLE_DISC_TO;
2352 xprt->ops = &xs_udp_ops;
2354 xprt->timeout = &xs_udp_default_timeout;
2356 switch (addr->sa_family) {
2358 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2359 xprt_set_bound(xprt);
2361 INIT_DELAYED_WORK(&transport->connect_worker,
2362 xs_udp_connect_worker4);
2363 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2366 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2367 xprt_set_bound(xprt);
2369 INIT_DELAYED_WORK(&transport->connect_worker,
2370 xs_udp_connect_worker6);
2371 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2375 return ERR_PTR(-EAFNOSUPPORT);
2378 if (xprt_bound(xprt))
2379 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2380 xprt->address_strings[RPC_DISPLAY_ADDR],
2381 xprt->address_strings[RPC_DISPLAY_PORT],
2382 xprt->address_strings[RPC_DISPLAY_PROTO]);
2384 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2385 xprt->address_strings[RPC_DISPLAY_ADDR],
2386 xprt->address_strings[RPC_DISPLAY_PROTO]);
2388 if (try_module_get(THIS_MODULE))
2393 return ERR_PTR(-EINVAL);
2396 static const struct rpc_timeout xs_tcp_default_timeout = {
2397 .to_initval = 60 * HZ,
2398 .to_maxval = 60 * HZ,
2403 * xs_setup_tcp - Set up transport to use a TCP socket
2404 * @args: rpc transport creation arguments
2407 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2409 struct sockaddr *addr = args->dstaddr;
2410 struct rpc_xprt *xprt;
2411 struct sock_xprt *transport;
2413 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2416 transport = container_of(xprt, struct sock_xprt, xprt);
2418 xprt->prot = IPPROTO_TCP;
2419 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2420 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2422 xprt->bind_timeout = XS_BIND_TO;
2423 xprt->connect_timeout = XS_TCP_CONN_TO;
2424 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2425 xprt->idle_timeout = XS_IDLE_DISC_TO;
2427 xprt->ops = &xs_tcp_ops;
2428 xprt->timeout = &xs_tcp_default_timeout;
2430 switch (addr->sa_family) {
2432 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2433 xprt_set_bound(xprt);
2435 INIT_DELAYED_WORK(&transport->connect_worker,
2436 xs_tcp_connect_worker4);
2437 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2440 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2441 xprt_set_bound(xprt);
2443 INIT_DELAYED_WORK(&transport->connect_worker,
2444 xs_tcp_connect_worker6);
2445 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2449 return ERR_PTR(-EAFNOSUPPORT);
2452 if (xprt_bound(xprt))
2453 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2454 xprt->address_strings[RPC_DISPLAY_ADDR],
2455 xprt->address_strings[RPC_DISPLAY_PORT],
2456 xprt->address_strings[RPC_DISPLAY_PROTO]);
2458 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2459 xprt->address_strings[RPC_DISPLAY_ADDR],
2460 xprt->address_strings[RPC_DISPLAY_PROTO]);
2463 if (try_module_get(THIS_MODULE))
2468 return ERR_PTR(-EINVAL);
2472 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2473 * @args: rpc transport creation arguments
2476 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2478 struct sockaddr *addr = args->dstaddr;
2479 struct rpc_xprt *xprt;
2480 struct sock_xprt *transport;
2481 struct svc_sock *bc_sock;
2486 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2489 transport = container_of(xprt, struct sock_xprt, xprt);
2491 xprt->prot = IPPROTO_TCP;
2492 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2493 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2494 xprt->timeout = &xs_tcp_default_timeout;
2497 xprt_set_bound(xprt);
2498 xprt->bind_timeout = 0;
2499 xprt->connect_timeout = 0;
2500 xprt->reestablish_timeout = 0;
2501 xprt->idle_timeout = 0;
2504 * The backchannel uses the same socket connection as the
2507 xprt->bc_xprt = args->bc_xprt;
2508 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2509 bc_sock->sk_bc_xprt = xprt;
2510 transport->sock = bc_sock->sk_sock;
2511 transport->inet = bc_sock->sk_sk;
2513 xprt->ops = &bc_tcp_ops;
2515 switch (addr->sa_family) {
2517 xs_format_peer_addresses(xprt, "tcp",
2521 xs_format_peer_addresses(xprt, "tcp",
2522 RPCBIND_NETID_TCP6);
2526 return ERR_PTR(-EAFNOSUPPORT);
2529 if (xprt_bound(xprt))
2530 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2531 xprt->address_strings[RPC_DISPLAY_ADDR],
2532 xprt->address_strings[RPC_DISPLAY_PORT],
2533 xprt->address_strings[RPC_DISPLAY_PROTO]);
2535 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2536 xprt->address_strings[RPC_DISPLAY_ADDR],
2537 xprt->address_strings[RPC_DISPLAY_PROTO]);
2540 * Since we don't want connections for the backchannel, we set
2541 * the xprt status to connected
2543 xprt_set_connected(xprt);
2546 if (try_module_get(THIS_MODULE))
2550 return ERR_PTR(-EINVAL);
2553 static struct xprt_class xs_udp_transport = {
2554 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2556 .owner = THIS_MODULE,
2557 .ident = XPRT_TRANSPORT_UDP,
2558 .setup = xs_setup_udp,
2561 static struct xprt_class xs_tcp_transport = {
2562 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2564 .owner = THIS_MODULE,
2565 .ident = XPRT_TRANSPORT_TCP,
2566 .setup = xs_setup_tcp,
2569 static struct xprt_class xs_bc_tcp_transport = {
2570 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2571 .name = "tcp NFSv4.1 backchannel",
2572 .owner = THIS_MODULE,
2573 .ident = XPRT_TRANSPORT_BC_TCP,
2574 .setup = xs_setup_bc_tcp,
2578 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2581 int init_socket_xprt(void)
2584 if (!sunrpc_table_header)
2585 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2588 xprt_register_transport(&xs_udp_transport);
2589 xprt_register_transport(&xs_tcp_transport);
2590 xprt_register_transport(&xs_bc_tcp_transport);
2596 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2599 void cleanup_socket_xprt(void)
2602 if (sunrpc_table_header) {
2603 unregister_sysctl_table(sunrpc_table_header);
2604 sunrpc_table_header = NULL;
2608 xprt_unregister_transport(&xs_udp_transport);
2609 xprt_unregister_transport(&xs_tcp_transport);
2610 xprt_unregister_transport(&xs_bc_tcp_transport);
2613 static int param_set_uint_minmax(const char *val, struct kernel_param *kp,
2614 unsigned int min, unsigned int max)
2621 ret = strict_strtoul(val, 0, &num);
2622 if (ret == -EINVAL || num < min || num > max)
2624 *((unsigned int *)kp->arg) = num;
2628 static int param_set_portnr(const char *val, struct kernel_param *kp)
2630 return param_set_uint_minmax(val, kp,
2635 static int param_get_portnr(char *buffer, struct kernel_param *kp)
2637 return param_get_uint(buffer, kp);
2639 #define param_check_portnr(name, p) \
2640 __param_check(name, p, unsigned int);
2642 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2643 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2645 static int param_set_slot_table_size(const char *val, struct kernel_param *kp)
2647 return param_set_uint_minmax(val, kp,
2649 RPC_MAX_SLOT_TABLE);
2652 static int param_get_slot_table_size(char *buffer, struct kernel_param *kp)
2654 return param_get_uint(buffer, kp);
2656 #define param_check_slot_table_size(name, p) \
2657 __param_check(name, p, unsigned int);
2659 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
2660 slot_table_size, 0644);
2661 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
2662 slot_table_size, 0644);