2 * linux/net/sunrpc/xprtsock.c
4 * Client-side transport implementation for sockets.
6 * TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com>
7 * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
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/xprtsock.h>
36 #include <linux/file.h>
39 #include <net/checksum.h>
46 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
47 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
49 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
50 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
53 * We can register our own files under /proc/sys/sunrpc by
54 * calling register_sysctl_table() again. The files in that
55 * directory become the union of all files registered there.
57 * We simply need to make sure that we don't collide with
58 * someone else's file names!
63 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
64 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
65 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
66 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
68 static struct ctl_table_header *sunrpc_table_header;
71 * FIXME: changing the UDP slot table size should also resize the UDP
72 * socket buffers for existing UDP transports
74 static ctl_table xs_tunables_table[] = {
76 .ctl_name = CTL_SLOTTABLE_UDP,
77 .procname = "udp_slot_table_entries",
78 .data = &xprt_udp_slot_table_entries,
79 .maxlen = sizeof(unsigned int),
81 .proc_handler = &proc_dointvec_minmax,
82 .strategy = &sysctl_intvec,
83 .extra1 = &min_slot_table_size,
84 .extra2 = &max_slot_table_size
87 .ctl_name = CTL_SLOTTABLE_TCP,
88 .procname = "tcp_slot_table_entries",
89 .data = &xprt_tcp_slot_table_entries,
90 .maxlen = sizeof(unsigned int),
92 .proc_handler = &proc_dointvec_minmax,
93 .strategy = &sysctl_intvec,
94 .extra1 = &min_slot_table_size,
95 .extra2 = &max_slot_table_size
98 .ctl_name = CTL_MIN_RESVPORT,
99 .procname = "min_resvport",
100 .data = &xprt_min_resvport,
101 .maxlen = sizeof(unsigned int),
103 .proc_handler = &proc_dointvec_minmax,
104 .strategy = &sysctl_intvec,
105 .extra1 = &xprt_min_resvport_limit,
106 .extra2 = &xprt_max_resvport_limit
109 .ctl_name = CTL_MAX_RESVPORT,
110 .procname = "max_resvport",
111 .data = &xprt_max_resvport,
112 .maxlen = sizeof(unsigned int),
114 .proc_handler = &proc_dointvec_minmax,
115 .strategy = &sysctl_intvec,
116 .extra1 = &xprt_min_resvport_limit,
117 .extra2 = &xprt_max_resvport_limit
124 static ctl_table sunrpc_table[] = {
126 .ctl_name = CTL_SUNRPC,
127 .procname = "sunrpc",
129 .child = xs_tunables_table
139 * How many times to try sending a request on a socket before waiting
140 * for the socket buffer to clear.
142 #define XS_SENDMSG_RETRY (10U)
145 * Time out for an RPC UDP socket connect. UDP socket connects are
146 * synchronous, but we set a timeout anyway in case of resource
147 * exhaustion on the local host.
149 #define XS_UDP_CONN_TO (5U * HZ)
152 * Wait duration for an RPC TCP connection to be established. Solaris
153 * NFS over TCP uses 60 seconds, for example, which is in line with how
154 * long a server takes to reboot.
156 #define XS_TCP_CONN_TO (60U * HZ)
159 * Wait duration for a reply from the RPC portmapper.
161 #define XS_BIND_TO (60U * HZ)
164 * Delay if a UDP socket connect error occurs. This is most likely some
165 * kind of resource problem on the local host.
167 #define XS_UDP_REEST_TO (2U * HZ)
170 * The reestablish timeout allows clients to delay for a bit before attempting
171 * to reconnect to a server that just dropped our connection.
173 * We implement an exponential backoff when trying to reestablish a TCP
174 * transport connection with the server. Some servers like to drop a TCP
175 * connection when they are overworked, so we start with a short timeout and
176 * increase over time if the server is down or not responding.
178 #define XS_TCP_INIT_REEST_TO (3U * HZ)
179 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
182 * TCP idle timeout; client drops the transport socket if it is idle
183 * for this long. Note that we also timeout UDP sockets to prevent
184 * holding port numbers when there is no RPC traffic.
186 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
189 # undef RPC_DEBUG_DATA
190 # define RPCDBG_FACILITY RPCDBG_TRANS
193 #ifdef RPC_DEBUG_DATA
194 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
196 u8 *buf = (u8 *) packet;
199 dprintk("RPC: %s\n", msg);
200 for (j = 0; j < count && j < 128; j += 4) {
204 dprintk("0x%04x ", j);
206 dprintk("%02x%02x%02x%02x ",
207 buf[j], buf[j+1], buf[j+2], buf[j+3]);
212 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
219 struct rpc_xprt xprt;
224 struct socket * sock;
228 * State of TCP reply receive
236 unsigned long tcp_copied,
240 * Connection of transports
242 struct delayed_work connect_worker;
243 struct sockaddr_storage addr;
247 * UDP socket buffer size parameters
253 * Saved socket callback addresses
255 void (*old_data_ready)(struct sock *, int);
256 void (*old_state_change)(struct sock *);
257 void (*old_write_space)(struct sock *);
261 * TCP receive state flags
263 #define TCP_RCV_LAST_FRAG (1UL << 0)
264 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
265 #define TCP_RCV_COPY_XID (1UL << 2)
266 #define TCP_RCV_COPY_DATA (1UL << 3)
268 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
270 return (struct sockaddr *) &xprt->addr;
273 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
275 return (struct sockaddr_in *) &xprt->addr;
278 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
280 return (struct sockaddr_in6 *) &xprt->addr;
283 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
284 const char *protocol,
287 struct sockaddr_in *addr = xs_addr_in(xprt);
290 buf = kzalloc(20, GFP_KERNEL);
292 snprintf(buf, 20, NIPQUAD_FMT,
293 NIPQUAD(addr->sin_addr.s_addr));
295 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
297 buf = kzalloc(8, GFP_KERNEL);
299 snprintf(buf, 8, "%u",
300 ntohs(addr->sin_port));
302 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
304 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
306 buf = kzalloc(48, GFP_KERNEL);
308 snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
309 NIPQUAD(addr->sin_addr.s_addr),
310 ntohs(addr->sin_port),
313 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
315 buf = kzalloc(10, GFP_KERNEL);
317 snprintf(buf, 10, "%02x%02x%02x%02x",
318 NIPQUAD(addr->sin_addr.s_addr));
320 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
322 buf = kzalloc(8, GFP_KERNEL);
324 snprintf(buf, 8, "%4hx",
325 ntohs(addr->sin_port));
327 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
329 buf = kzalloc(30, GFP_KERNEL);
331 snprintf(buf, 30, NIPQUAD_FMT".%u.%u",
332 NIPQUAD(addr->sin_addr.s_addr),
333 ntohs(addr->sin_port) >> 8,
334 ntohs(addr->sin_port) & 0xff);
336 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
338 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
341 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt,
342 const char *protocol,
345 struct sockaddr_in6 *addr = xs_addr_in6(xprt);
348 buf = kzalloc(40, GFP_KERNEL);
350 snprintf(buf, 40, NIP6_FMT,
351 NIP6(addr->sin6_addr));
353 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
355 buf = kzalloc(8, GFP_KERNEL);
357 snprintf(buf, 8, "%u",
358 ntohs(addr->sin6_port));
360 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
362 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
364 buf = kzalloc(64, GFP_KERNEL);
366 snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s",
367 NIP6(addr->sin6_addr),
368 ntohs(addr->sin6_port),
371 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
373 buf = kzalloc(36, GFP_KERNEL);
375 snprintf(buf, 36, NIP6_SEQFMT,
376 NIP6(addr->sin6_addr));
378 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
380 buf = kzalloc(8, GFP_KERNEL);
382 snprintf(buf, 8, "%4hx",
383 ntohs(addr->sin6_port));
385 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
387 buf = kzalloc(50, GFP_KERNEL);
389 snprintf(buf, 50, NIP6_FMT".%u.%u",
390 NIP6(addr->sin6_addr),
391 ntohs(addr->sin6_port) >> 8,
392 ntohs(addr->sin6_port) & 0xff);
394 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
396 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
399 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
401 kfree(xprt->address_strings[RPC_DISPLAY_ADDR]);
402 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
403 kfree(xprt->address_strings[RPC_DISPLAY_ALL]);
404 kfree(xprt->address_strings[RPC_DISPLAY_HEX_ADDR]);
405 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
406 kfree(xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR]);
409 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
411 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
413 struct msghdr msg = {
415 .msg_namelen = addrlen,
416 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
419 .iov_base = vec->iov_base + base,
420 .iov_len = vec->iov_len - base,
423 if (iov.iov_len != 0)
424 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
425 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
428 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
431 unsigned int remainder;
434 remainder = xdr->page_len - base;
435 base += xdr->page_base;
436 ppage = xdr->pages + (base >> PAGE_SHIFT);
439 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
440 int flags = XS_SENDMSG_FLAGS;
443 if (remainder != 0 || more)
445 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
446 if (remainder == 0 || err != len)
460 * xs_sendpages - write pages directly to a socket
461 * @sock: socket to send on
462 * @addr: UDP only -- address of destination
463 * @addrlen: UDP only -- length of destination address
464 * @xdr: buffer containing this request
465 * @base: starting position in the buffer
468 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
470 unsigned int remainder = xdr->len - base;
476 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
482 if (base < xdr->head[0].iov_len || addr != NULL) {
483 unsigned int len = xdr->head[0].iov_len - base;
485 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
486 if (remainder == 0 || err != len)
491 base -= xdr->head[0].iov_len;
493 if (base < xdr->page_len) {
494 unsigned int len = xdr->page_len - base;
496 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
497 if (remainder == 0 || err != len)
502 base -= xdr->page_len;
504 if (base >= xdr->tail[0].iov_len)
506 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
516 * xs_nospace - place task on wait queue if transmit was incomplete
517 * @task: task to put to sleep
520 static void xs_nospace(struct rpc_task *task)
522 struct rpc_rqst *req = task->tk_rqstp;
523 struct rpc_xprt *xprt = req->rq_xprt;
524 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
526 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
527 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
530 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
531 /* Protect against races with write_space */
532 spin_lock_bh(&xprt->transport_lock);
534 /* Don't race with disconnect */
535 if (!xprt_connected(xprt))
536 task->tk_status = -ENOTCONN;
537 else if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
538 xprt_wait_for_buffer_space(task);
540 spin_unlock_bh(&xprt->transport_lock);
542 /* Keep holding the socket if it is blocked */
543 rpc_delay(task, HZ>>4);
547 * xs_udp_send_request - write an RPC request to a UDP socket
548 * @task: address of RPC task that manages the state of an RPC request
551 * 0: The request has been sent
552 * EAGAIN: The socket was blocked, please call again later to
553 * complete the request
554 * ENOTCONN: Caller needs to invoke connect logic then call again
555 * other: Some other error occured, the request was not sent
557 static int xs_udp_send_request(struct rpc_task *task)
559 struct rpc_rqst *req = task->tk_rqstp;
560 struct rpc_xprt *xprt = req->rq_xprt;
561 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
562 struct xdr_buf *xdr = &req->rq_snd_buf;
565 xs_pktdump("packet data:",
566 req->rq_svec->iov_base,
567 req->rq_svec->iov_len);
569 req->rq_xtime = jiffies;
570 status = xs_sendpages(transport->sock,
575 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
576 xdr->len - req->rq_bytes_sent, status);
579 task->tk_bytes_sent += status;
580 if (status >= req->rq_slen)
582 /* Still some bytes left; set up for a retry later. */
590 /* When the server has died, an ICMP port unreachable message
591 * prompts ECONNREFUSED. */
597 dprintk("RPC: sendmsg returned unrecognized error %d\n",
606 * xs_tcp_shutdown - gracefully shut down a TCP socket
609 * Initiates a graceful shutdown of the TCP socket by calling the
610 * equivalent of shutdown(SHUT_WR);
612 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
614 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
615 struct socket *sock = transport->sock;
618 kernel_sock_shutdown(sock, SHUT_WR);
621 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
623 u32 reclen = buf->len - sizeof(rpc_fraghdr);
624 rpc_fraghdr *base = buf->head[0].iov_base;
625 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
629 * xs_tcp_send_request - write an RPC request to a TCP socket
630 * @task: address of RPC task that manages the state of an RPC request
633 * 0: The request has been sent
634 * EAGAIN: The socket was blocked, please call again later to
635 * complete the request
636 * ENOTCONN: Caller needs to invoke connect logic then call again
637 * other: Some other error occured, the request was not sent
639 * XXX: In the case of soft timeouts, should we eventually give up
640 * if sendmsg is not able to make progress?
642 static int xs_tcp_send_request(struct rpc_task *task)
644 struct rpc_rqst *req = task->tk_rqstp;
645 struct rpc_xprt *xprt = req->rq_xprt;
646 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
647 struct xdr_buf *xdr = &req->rq_snd_buf;
649 unsigned int retry = 0;
651 xs_encode_tcp_record_marker(&req->rq_snd_buf);
653 xs_pktdump("packet data:",
654 req->rq_svec->iov_base,
655 req->rq_svec->iov_len);
657 /* Continue transmitting the packet/record. We must be careful
658 * to cope with writespace callbacks arriving _after_ we have
659 * called sendmsg(). */
661 req->rq_xtime = jiffies;
662 status = xs_sendpages(transport->sock,
663 NULL, 0, xdr, req->rq_bytes_sent);
665 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
666 xdr->len - req->rq_bytes_sent, status);
668 if (unlikely(status < 0))
671 /* If we've sent the entire packet, immediately
672 * reset the count of bytes sent. */
673 req->rq_bytes_sent += status;
674 task->tk_bytes_sent += status;
675 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
676 req->rq_bytes_sent = 0;
681 if (retry++ > XS_SENDMSG_RETRY)
696 dprintk("RPC: sendmsg returned unrecognized error %d\n",
698 xs_tcp_shutdown(xprt);
706 * xs_tcp_release_xprt - clean up after a tcp transmission
710 * This cleans up if an error causes us to abort the transmission of a request.
711 * In this case, the socket may need to be reset in order to avoid confusing
714 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
716 struct rpc_rqst *req;
718 if (task != xprt->snd_task)
722 req = task->tk_rqstp;
723 if (req->rq_bytes_sent == 0)
725 if (req->rq_bytes_sent == req->rq_snd_buf.len)
727 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
729 xprt_release_xprt(xprt, task);
733 * xs_close - close a socket
736 * This is used when all requests are complete; ie, no DRC state remains
737 * on the server we want to save.
739 static void xs_close(struct rpc_xprt *xprt)
741 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
742 struct socket *sock = transport->sock;
743 struct sock *sk = transport->inet;
746 goto clear_close_wait;
748 dprintk("RPC: xs_close xprt %p\n", xprt);
750 write_lock_bh(&sk->sk_callback_lock);
751 transport->inet = NULL;
752 transport->sock = NULL;
754 sk->sk_user_data = NULL;
755 sk->sk_data_ready = transport->old_data_ready;
756 sk->sk_state_change = transport->old_state_change;
757 sk->sk_write_space = transport->old_write_space;
758 write_unlock_bh(&sk->sk_callback_lock);
764 smp_mb__before_clear_bit();
765 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
766 clear_bit(XPRT_CLOSING, &xprt->state);
767 smp_mb__after_clear_bit();
768 xprt_disconnect_done(xprt);
772 * xs_destroy - prepare to shutdown a transport
773 * @xprt: doomed transport
776 static void xs_destroy(struct rpc_xprt *xprt)
778 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
780 dprintk("RPC: xs_destroy xprt %p\n", xprt);
782 cancel_rearming_delayed_work(&transport->connect_worker);
785 xs_free_peer_addresses(xprt);
788 module_put(THIS_MODULE);
791 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
793 return (struct rpc_xprt *) sk->sk_user_data;
797 * xs_udp_data_ready - "data ready" callback for UDP sockets
798 * @sk: socket with data to read
799 * @len: how much data to read
802 static void xs_udp_data_ready(struct sock *sk, int len)
804 struct rpc_task *task;
805 struct rpc_xprt *xprt;
806 struct rpc_rqst *rovr;
808 int err, repsize, copied;
812 read_lock(&sk->sk_callback_lock);
813 dprintk("RPC: xs_udp_data_ready...\n");
814 if (!(xprt = xprt_from_sock(sk)))
817 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
823 repsize = skb->len - sizeof(struct udphdr);
825 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
829 /* Copy the XID from the skb... */
830 xp = skb_header_pointer(skb, sizeof(struct udphdr),
831 sizeof(_xid), &_xid);
835 /* Look up and lock the request corresponding to the given XID */
836 spin_lock(&xprt->transport_lock);
837 rovr = xprt_lookup_rqst(xprt, *xp);
840 task = rovr->rq_task;
842 if ((copied = rovr->rq_private_buf.buflen) > repsize)
845 /* Suck it into the iovec, verify checksum if not done by hw. */
846 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
847 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
851 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
853 /* Something worked... */
854 dst_confirm(skb->dst);
856 xprt_adjust_cwnd(task, copied);
857 xprt_update_rtt(task);
858 xprt_complete_rqst(task, copied);
861 spin_unlock(&xprt->transport_lock);
863 skb_free_datagram(sk, skb);
865 read_unlock(&sk->sk_callback_lock);
868 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
870 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
874 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
875 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
876 used = xdr_skb_read_bits(desc, p, len);
877 transport->tcp_offset += used;
881 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
882 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
883 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
885 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
886 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
888 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
889 transport->tcp_offset = 0;
891 /* Sanity check of the record length */
892 if (unlikely(transport->tcp_reclen < 4)) {
893 dprintk("RPC: invalid TCP record fragment length\n");
894 xprt_force_disconnect(xprt);
897 dprintk("RPC: reading TCP record fragment of length %d\n",
898 transport->tcp_reclen);
901 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
903 if (transport->tcp_offset == transport->tcp_reclen) {
904 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
905 transport->tcp_offset = 0;
906 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
907 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
908 transport->tcp_flags |= TCP_RCV_COPY_XID;
909 transport->tcp_copied = 0;
914 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
919 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
920 dprintk("RPC: reading XID (%Zu bytes)\n", len);
921 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
922 used = xdr_skb_read_bits(desc, p, len);
923 transport->tcp_offset += used;
926 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
927 transport->tcp_flags |= TCP_RCV_COPY_DATA;
928 transport->tcp_copied = 4;
929 dprintk("RPC: reading reply for XID %08x\n",
930 ntohl(transport->tcp_xid));
931 xs_tcp_check_fraghdr(transport);
934 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
936 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
937 struct rpc_rqst *req;
938 struct xdr_buf *rcvbuf;
942 /* Find and lock the request corresponding to this xid */
943 spin_lock(&xprt->transport_lock);
944 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
946 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
947 dprintk("RPC: XID %08x request not found!\n",
948 ntohl(transport->tcp_xid));
949 spin_unlock(&xprt->transport_lock);
953 rcvbuf = &req->rq_private_buf;
955 if (len > transport->tcp_reclen - transport->tcp_offset) {
956 struct xdr_skb_reader my_desc;
958 len = transport->tcp_reclen - transport->tcp_offset;
959 memcpy(&my_desc, desc, sizeof(my_desc));
961 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
962 &my_desc, xdr_skb_read_bits);
966 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
967 desc, xdr_skb_read_bits);
970 transport->tcp_copied += r;
971 transport->tcp_offset += r;
974 /* Error when copying to the receive buffer,
975 * usually because we weren't able to allocate
976 * additional buffer pages. All we can do now
977 * is turn off TCP_RCV_COPY_DATA, so the request
978 * will not receive any additional updates,
980 * Any remaining data from this record will
983 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
984 dprintk("RPC: XID %08x truncated request\n",
985 ntohl(transport->tcp_xid));
986 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
987 "tcp_offset = %u, tcp_reclen = %u\n",
988 xprt, transport->tcp_copied,
989 transport->tcp_offset, transport->tcp_reclen);
993 dprintk("RPC: XID %08x read %Zd bytes\n",
994 ntohl(transport->tcp_xid), r);
995 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
996 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
997 transport->tcp_offset, transport->tcp_reclen);
999 if (transport->tcp_copied == req->rq_private_buf.buflen)
1000 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1001 else if (transport->tcp_offset == transport->tcp_reclen) {
1002 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1003 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1007 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1008 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1009 spin_unlock(&xprt->transport_lock);
1010 xs_tcp_check_fraghdr(transport);
1013 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1017 len = transport->tcp_reclen - transport->tcp_offset;
1018 if (len > desc->count)
1021 desc->offset += len;
1022 transport->tcp_offset += len;
1023 dprintk("RPC: discarded %Zu bytes\n", len);
1024 xs_tcp_check_fraghdr(transport);
1027 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1029 struct rpc_xprt *xprt = rd_desc->arg.data;
1030 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1031 struct xdr_skb_reader desc = {
1037 dprintk("RPC: xs_tcp_data_recv started\n");
1039 /* Read in a new fragment marker if necessary */
1040 /* Can we ever really expect to get completely empty fragments? */
1041 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1042 xs_tcp_read_fraghdr(xprt, &desc);
1045 /* Read in the xid if necessary */
1046 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1047 xs_tcp_read_xid(transport, &desc);
1050 /* Read in the request data */
1051 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1052 xs_tcp_read_request(xprt, &desc);
1055 /* Skip over any trailing bytes on short reads */
1056 xs_tcp_read_discard(transport, &desc);
1057 } while (desc.count);
1058 dprintk("RPC: xs_tcp_data_recv done\n");
1059 return len - desc.count;
1063 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1064 * @sk: socket with data to read
1065 * @bytes: how much data to read
1068 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1070 struct rpc_xprt *xprt;
1071 read_descriptor_t rd_desc;
1073 dprintk("RPC: xs_tcp_data_ready...\n");
1075 read_lock(&sk->sk_callback_lock);
1076 if (!(xprt = xprt_from_sock(sk)))
1081 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1082 rd_desc.arg.data = xprt;
1083 rd_desc.count = 65536;
1084 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1086 read_unlock(&sk->sk_callback_lock);
1090 * xs_tcp_state_change - callback to handle TCP socket state changes
1091 * @sk: socket whose state has changed
1094 static void xs_tcp_state_change(struct sock *sk)
1096 struct rpc_xprt *xprt;
1098 read_lock(&sk->sk_callback_lock);
1099 if (!(xprt = xprt_from_sock(sk)))
1101 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1102 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1103 sk->sk_state, xprt_connected(xprt),
1104 sock_flag(sk, SOCK_DEAD),
1105 sock_flag(sk, SOCK_ZAPPED));
1107 switch (sk->sk_state) {
1108 case TCP_ESTABLISHED:
1109 spin_lock_bh(&xprt->transport_lock);
1110 if (!xprt_test_and_set_connected(xprt)) {
1111 struct sock_xprt *transport = container_of(xprt,
1112 struct sock_xprt, xprt);
1114 /* Reset TCP record info */
1115 transport->tcp_offset = 0;
1116 transport->tcp_reclen = 0;
1117 transport->tcp_copied = 0;
1118 transport->tcp_flags =
1119 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1121 xprt_wake_pending_tasks(xprt, 0);
1123 spin_unlock_bh(&xprt->transport_lock);
1126 /* The client initiated a shutdown of the socket */
1127 xprt->reestablish_timeout = 0;
1128 set_bit(XPRT_CLOSING, &xprt->state);
1129 smp_mb__before_clear_bit();
1130 clear_bit(XPRT_CONNECTED, &xprt->state);
1131 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1132 smp_mb__after_clear_bit();
1134 case TCP_CLOSE_WAIT:
1135 /* The server initiated a shutdown of the socket */
1136 set_bit(XPRT_CLOSING, &xprt->state);
1137 xprt_force_disconnect(xprt);
1141 * If the server closed down the connection, make sure that
1142 * we back off before reconnecting
1144 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1145 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1148 smp_mb__before_clear_bit();
1149 clear_bit(XPRT_CONNECTED, &xprt->state);
1150 smp_mb__after_clear_bit();
1153 smp_mb__before_clear_bit();
1154 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1155 clear_bit(XPRT_CLOSING, &xprt->state);
1156 smp_mb__after_clear_bit();
1157 /* Mark transport as closed and wake up all pending tasks */
1158 xprt_disconnect_done(xprt);
1161 read_unlock(&sk->sk_callback_lock);
1165 * xs_udp_write_space - callback invoked when socket buffer space
1167 * @sk: socket whose state has changed
1169 * Called when more output buffer space is available for this socket.
1170 * We try not to wake our writers until they can make "significant"
1171 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1172 * with a bunch of small requests.
1174 static void xs_udp_write_space(struct sock *sk)
1176 read_lock(&sk->sk_callback_lock);
1178 /* from net/core/sock.c:sock_def_write_space */
1179 if (sock_writeable(sk)) {
1180 struct socket *sock;
1181 struct rpc_xprt *xprt;
1183 if (unlikely(!(sock = sk->sk_socket)))
1185 if (unlikely(!(xprt = xprt_from_sock(sk))))
1187 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1190 xprt_write_space(xprt);
1194 read_unlock(&sk->sk_callback_lock);
1198 * xs_tcp_write_space - callback invoked when socket buffer space
1200 * @sk: socket whose state has changed
1202 * Called when more output buffer space is available for this socket.
1203 * We try not to wake our writers until they can make "significant"
1204 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1205 * with a bunch of small requests.
1207 static void xs_tcp_write_space(struct sock *sk)
1209 read_lock(&sk->sk_callback_lock);
1211 /* from net/core/stream.c:sk_stream_write_space */
1212 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1213 struct socket *sock;
1214 struct rpc_xprt *xprt;
1216 if (unlikely(!(sock = sk->sk_socket)))
1218 if (unlikely(!(xprt = xprt_from_sock(sk))))
1220 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1223 xprt_write_space(xprt);
1227 read_unlock(&sk->sk_callback_lock);
1230 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1232 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1233 struct sock *sk = transport->inet;
1235 if (transport->rcvsize) {
1236 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1237 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1239 if (transport->sndsize) {
1240 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1241 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1242 sk->sk_write_space(sk);
1247 * xs_udp_set_buffer_size - set send and receive limits
1248 * @xprt: generic transport
1249 * @sndsize: requested size of send buffer, in bytes
1250 * @rcvsize: requested size of receive buffer, in bytes
1252 * Set socket send and receive buffer size limits.
1254 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1256 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1258 transport->sndsize = 0;
1260 transport->sndsize = sndsize + 1024;
1261 transport->rcvsize = 0;
1263 transport->rcvsize = rcvsize + 1024;
1265 xs_udp_do_set_buffer_size(xprt);
1269 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1270 * @task: task that timed out
1272 * Adjust the congestion window after a retransmit timeout has occurred.
1274 static void xs_udp_timer(struct rpc_task *task)
1276 xprt_adjust_cwnd(task, -ETIMEDOUT);
1279 static unsigned short xs_get_random_port(void)
1281 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1282 unsigned short rand = (unsigned short) net_random() % range;
1283 return rand + xprt_min_resvport;
1287 * xs_set_port - reset the port number in the remote endpoint address
1288 * @xprt: generic transport
1289 * @port: new port number
1292 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1294 struct sockaddr *addr = xs_addr(xprt);
1296 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1298 switch (addr->sa_family) {
1300 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1303 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1310 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1312 unsigned short port = transport->port;
1314 if (port == 0 && transport->xprt.resvport)
1315 port = xs_get_random_port();
1319 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1321 if (transport->port != 0)
1322 transport->port = 0;
1323 if (!transport->xprt.resvport)
1325 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1326 return xprt_max_resvport;
1330 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1332 struct sockaddr_in myaddr = {
1333 .sin_family = AF_INET,
1335 struct sockaddr_in *sa;
1337 unsigned short port = xs_get_srcport(transport, sock);
1338 unsigned short last;
1340 sa = (struct sockaddr_in *)&transport->addr;
1341 myaddr.sin_addr = sa->sin_addr;
1343 myaddr.sin_port = htons(port);
1344 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1349 transport->port = port;
1353 port = xs_next_srcport(transport, sock, port);
1356 } while (err == -EADDRINUSE && nloop != 2);
1357 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n",
1358 __FUNCTION__, NIPQUAD(myaddr.sin_addr),
1359 port, err ? "failed" : "ok", err);
1363 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1365 struct sockaddr_in6 myaddr = {
1366 .sin6_family = AF_INET6,
1368 struct sockaddr_in6 *sa;
1370 unsigned short port = xs_get_srcport(transport, sock);
1371 unsigned short last;
1373 sa = (struct sockaddr_in6 *)&transport->addr;
1374 myaddr.sin6_addr = sa->sin6_addr;
1376 myaddr.sin6_port = htons(port);
1377 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1382 transport->port = port;
1386 port = xs_next_srcport(transport, sock, port);
1389 } while (err == -EADDRINUSE && nloop != 2);
1390 dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
1391 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
1395 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1396 static struct lock_class_key xs_key[2];
1397 static struct lock_class_key xs_slock_key[2];
1399 static inline void xs_reclassify_socket4(struct socket *sock)
1401 struct sock *sk = sock->sk;
1403 BUG_ON(sock_owned_by_user(sk));
1404 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1405 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1408 static inline void xs_reclassify_socket6(struct socket *sock)
1410 struct sock *sk = sock->sk;
1412 BUG_ON(sock_owned_by_user(sk));
1413 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1414 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1417 static inline void xs_reclassify_socket4(struct socket *sock)
1421 static inline void xs_reclassify_socket6(struct socket *sock)
1426 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1428 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1430 if (!transport->inet) {
1431 struct sock *sk = sock->sk;
1433 write_lock_bh(&sk->sk_callback_lock);
1435 sk->sk_user_data = xprt;
1436 transport->old_data_ready = sk->sk_data_ready;
1437 transport->old_state_change = sk->sk_state_change;
1438 transport->old_write_space = sk->sk_write_space;
1439 sk->sk_data_ready = xs_udp_data_ready;
1440 sk->sk_write_space = xs_udp_write_space;
1441 sk->sk_no_check = UDP_CSUM_NORCV;
1442 sk->sk_allocation = GFP_ATOMIC;
1444 xprt_set_connected(xprt);
1446 /* Reset to new socket */
1447 transport->sock = sock;
1448 transport->inet = sk;
1450 write_unlock_bh(&sk->sk_callback_lock);
1452 xs_udp_do_set_buffer_size(xprt);
1456 * xs_udp_connect_worker4 - set up a UDP socket
1457 * @work: RPC transport to connect
1459 * Invoked by a work queue tasklet.
1461 static void xs_udp_connect_worker4(struct work_struct *work)
1463 struct sock_xprt *transport =
1464 container_of(work, struct sock_xprt, connect_worker.work);
1465 struct rpc_xprt *xprt = &transport->xprt;
1466 struct socket *sock = transport->sock;
1467 int err, status = -EIO;
1469 if (xprt->shutdown || !xprt_bound(xprt))
1472 /* Start by resetting any existing state */
1475 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1476 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1479 xs_reclassify_socket4(sock);
1481 if (xs_bind4(transport, sock)) {
1486 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1487 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1489 xs_udp_finish_connecting(xprt, sock);
1492 xprt_wake_pending_tasks(xprt, status);
1493 xprt_clear_connecting(xprt);
1497 * xs_udp_connect_worker6 - set up a UDP socket
1498 * @work: RPC transport to connect
1500 * Invoked by a work queue tasklet.
1502 static void xs_udp_connect_worker6(struct work_struct *work)
1504 struct sock_xprt *transport =
1505 container_of(work, struct sock_xprt, connect_worker.work);
1506 struct rpc_xprt *xprt = &transport->xprt;
1507 struct socket *sock = transport->sock;
1508 int err, status = -EIO;
1510 if (xprt->shutdown || !xprt_bound(xprt))
1513 /* Start by resetting any existing state */
1516 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1517 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1520 xs_reclassify_socket6(sock);
1522 if (xs_bind6(transport, sock) < 0) {
1527 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1528 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1530 xs_udp_finish_connecting(xprt, sock);
1533 xprt_wake_pending_tasks(xprt, status);
1534 xprt_clear_connecting(xprt);
1538 * We need to preserve the port number so the reply cache on the server can
1539 * find our cached RPC replies when we get around to reconnecting.
1541 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1544 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1545 struct sockaddr any;
1547 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1550 * Disconnect the transport socket by doing a connect operation
1551 * with AF_UNSPEC. This should return immediately...
1553 memset(&any, 0, sizeof(any));
1554 any.sa_family = AF_UNSPEC;
1555 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1557 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1561 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1563 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1565 if (!transport->inet) {
1566 struct sock *sk = sock->sk;
1568 write_lock_bh(&sk->sk_callback_lock);
1570 sk->sk_user_data = xprt;
1571 transport->old_data_ready = sk->sk_data_ready;
1572 transport->old_state_change = sk->sk_state_change;
1573 transport->old_write_space = sk->sk_write_space;
1574 sk->sk_data_ready = xs_tcp_data_ready;
1575 sk->sk_state_change = xs_tcp_state_change;
1576 sk->sk_write_space = xs_tcp_write_space;
1577 sk->sk_allocation = GFP_ATOMIC;
1579 /* socket options */
1580 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1581 sock_reset_flag(sk, SOCK_LINGER);
1582 tcp_sk(sk)->linger2 = 0;
1583 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1585 xprt_clear_connected(xprt);
1587 /* Reset to new socket */
1588 transport->sock = sock;
1589 transport->inet = sk;
1591 write_unlock_bh(&sk->sk_callback_lock);
1594 /* Tell the socket layer to start connecting... */
1595 xprt->stat.connect_count++;
1596 xprt->stat.connect_start = jiffies;
1597 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1601 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1602 * @work: RPC transport to connect
1604 * Invoked by a work queue tasklet.
1606 static void xs_tcp_connect_worker4(struct work_struct *work)
1608 struct sock_xprt *transport =
1609 container_of(work, struct sock_xprt, connect_worker.work);
1610 struct rpc_xprt *xprt = &transport->xprt;
1611 struct socket *sock = transport->sock;
1612 int err, status = -EIO;
1614 if (xprt->shutdown || !xprt_bound(xprt))
1618 /* start from scratch */
1619 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1620 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1623 xs_reclassify_socket4(sock);
1625 if (xs_bind4(transport, sock) < 0) {
1630 /* "close" the socket, preserving the local port */
1631 xs_tcp_reuse_connection(xprt);
1633 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1634 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1636 status = xs_tcp_finish_connecting(xprt, sock);
1637 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1638 xprt, -status, xprt_connected(xprt),
1639 sock->sk->sk_state);
1647 /* retry with existing socket, after a delay */
1650 /* get rid of existing socket, and retry */
1651 xs_tcp_shutdown(xprt);
1655 xprt_wake_pending_tasks(xprt, status);
1657 xprt_clear_connecting(xprt);
1661 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1662 * @work: RPC transport to connect
1664 * Invoked by a work queue tasklet.
1666 static void xs_tcp_connect_worker6(struct work_struct *work)
1668 struct sock_xprt *transport =
1669 container_of(work, struct sock_xprt, connect_worker.work);
1670 struct rpc_xprt *xprt = &transport->xprt;
1671 struct socket *sock = transport->sock;
1672 int err, status = -EIO;
1674 if (xprt->shutdown || !xprt_bound(xprt))
1678 /* start from scratch */
1679 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1680 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1683 xs_reclassify_socket6(sock);
1685 if (xs_bind6(transport, sock) < 0) {
1690 /* "close" the socket, preserving the local port */
1691 xs_tcp_reuse_connection(xprt);
1693 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1694 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1696 status = xs_tcp_finish_connecting(xprt, sock);
1697 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1698 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1706 /* retry with existing socket, after a delay */
1709 /* get rid of existing socket, and retry */
1710 xs_tcp_shutdown(xprt);
1714 xprt_wake_pending_tasks(xprt, status);
1716 xprt_clear_connecting(xprt);
1720 * xs_connect - connect a socket to a remote endpoint
1721 * @task: address of RPC task that manages state of connect request
1723 * TCP: If the remote end dropped the connection, delay reconnecting.
1725 * UDP socket connects are synchronous, but we use a work queue anyway
1726 * to guarantee that even unprivileged user processes can set up a
1727 * socket on a privileged port.
1729 * If a UDP socket connect fails, the delay behavior here prevents
1730 * retry floods (hard mounts).
1732 static void xs_connect(struct rpc_task *task)
1734 struct rpc_xprt *xprt = task->tk_xprt;
1735 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1737 if (xprt_test_and_set_connecting(xprt))
1740 if (transport->sock != NULL) {
1741 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1743 xprt, xprt->reestablish_timeout / HZ);
1744 queue_delayed_work(rpciod_workqueue,
1745 &transport->connect_worker,
1746 xprt->reestablish_timeout);
1747 xprt->reestablish_timeout <<= 1;
1748 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1749 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1751 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1752 queue_delayed_work(rpciod_workqueue,
1753 &transport->connect_worker, 0);
1757 static void xs_tcp_connect(struct rpc_task *task)
1759 struct rpc_xprt *xprt = task->tk_xprt;
1761 /* Initiate graceful shutdown of the socket if not already done */
1762 if (test_bit(XPRT_CONNECTED, &xprt->state))
1763 xs_tcp_shutdown(xprt);
1764 /* Exit if we need to wait for socket shutdown to complete */
1765 if (test_bit(XPRT_CLOSING, &xprt->state))
1771 * xs_udp_print_stats - display UDP socket-specifc stats
1772 * @xprt: rpc_xprt struct containing statistics
1776 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1778 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1780 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1782 xprt->stat.bind_count,
1785 xprt->stat.bad_xids,
1787 xprt->stat.bklog_u);
1791 * xs_tcp_print_stats - display TCP socket-specifc stats
1792 * @xprt: rpc_xprt struct containing statistics
1796 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1798 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1801 if (xprt_connected(xprt))
1802 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1804 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1806 xprt->stat.bind_count,
1807 xprt->stat.connect_count,
1808 xprt->stat.connect_time,
1812 xprt->stat.bad_xids,
1814 xprt->stat.bklog_u);
1817 static struct rpc_xprt_ops xs_udp_ops = {
1818 .set_buffer_size = xs_udp_set_buffer_size,
1819 .reserve_xprt = xprt_reserve_xprt_cong,
1820 .release_xprt = xprt_release_xprt_cong,
1821 .rpcbind = rpcb_getport_async,
1822 .set_port = xs_set_port,
1823 .connect = xs_connect,
1824 .buf_alloc = rpc_malloc,
1825 .buf_free = rpc_free,
1826 .send_request = xs_udp_send_request,
1827 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1828 .timer = xs_udp_timer,
1829 .release_request = xprt_release_rqst_cong,
1831 .destroy = xs_destroy,
1832 .print_stats = xs_udp_print_stats,
1835 static struct rpc_xprt_ops xs_tcp_ops = {
1836 .reserve_xprt = xprt_reserve_xprt,
1837 .release_xprt = xs_tcp_release_xprt,
1838 .rpcbind = rpcb_getport_async,
1839 .set_port = xs_set_port,
1840 .connect = xs_tcp_connect,
1841 .buf_alloc = rpc_malloc,
1842 .buf_free = rpc_free,
1843 .send_request = xs_tcp_send_request,
1844 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1845 .close = xs_tcp_shutdown,
1846 .destroy = xs_destroy,
1847 .print_stats = xs_tcp_print_stats,
1850 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1851 unsigned int slot_table_size)
1853 struct rpc_xprt *xprt;
1854 struct sock_xprt *new;
1856 if (args->addrlen > sizeof(xprt->addr)) {
1857 dprintk("RPC: xs_setup_xprt: address too large\n");
1858 return ERR_PTR(-EBADF);
1861 new = kzalloc(sizeof(*new), GFP_KERNEL);
1863 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1865 return ERR_PTR(-ENOMEM);
1869 xprt->max_reqs = slot_table_size;
1870 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1871 if (xprt->slot == NULL) {
1873 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1875 return ERR_PTR(-ENOMEM);
1878 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1879 xprt->addrlen = args->addrlen;
1881 memcpy(&new->addr, args->srcaddr, args->addrlen);
1886 static const struct rpc_timeout xs_udp_default_timeout = {
1887 .to_initval = 5 * HZ,
1888 .to_maxval = 30 * HZ,
1889 .to_increment = 5 * HZ,
1894 * xs_setup_udp - Set up transport to use a UDP socket
1895 * @args: rpc transport creation arguments
1898 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1900 struct sockaddr *addr = args->dstaddr;
1901 struct rpc_xprt *xprt;
1902 struct sock_xprt *transport;
1904 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1907 transport = container_of(xprt, struct sock_xprt, xprt);
1909 xprt->prot = IPPROTO_UDP;
1911 /* XXX: header size can vary due to auth type, IPv6, etc. */
1912 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1914 xprt->bind_timeout = XS_BIND_TO;
1915 xprt->connect_timeout = XS_UDP_CONN_TO;
1916 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1917 xprt->idle_timeout = XS_IDLE_DISC_TO;
1919 xprt->ops = &xs_udp_ops;
1921 xprt->timeout = &xs_udp_default_timeout;
1923 switch (addr->sa_family) {
1925 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1926 xprt_set_bound(xprt);
1928 INIT_DELAYED_WORK(&transport->connect_worker,
1929 xs_udp_connect_worker4);
1930 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
1933 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1934 xprt_set_bound(xprt);
1936 INIT_DELAYED_WORK(&transport->connect_worker,
1937 xs_udp_connect_worker6);
1938 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
1942 return ERR_PTR(-EAFNOSUPPORT);
1945 dprintk("RPC: set up transport to address %s\n",
1946 xprt->address_strings[RPC_DISPLAY_ALL]);
1948 if (try_module_get(THIS_MODULE))
1953 return ERR_PTR(-EINVAL);
1956 static const struct rpc_timeout xs_tcp_default_timeout = {
1957 .to_initval = 60 * HZ,
1958 .to_maxval = 60 * HZ,
1963 * xs_setup_tcp - Set up transport to use a TCP socket
1964 * @args: rpc transport creation arguments
1967 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
1969 struct sockaddr *addr = args->dstaddr;
1970 struct rpc_xprt *xprt;
1971 struct sock_xprt *transport;
1973 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
1976 transport = container_of(xprt, struct sock_xprt, xprt);
1978 xprt->prot = IPPROTO_TCP;
1979 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1980 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1982 xprt->bind_timeout = XS_BIND_TO;
1983 xprt->connect_timeout = XS_TCP_CONN_TO;
1984 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1985 xprt->idle_timeout = XS_IDLE_DISC_TO;
1987 xprt->ops = &xs_tcp_ops;
1988 xprt->timeout = &xs_tcp_default_timeout;
1990 switch (addr->sa_family) {
1992 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1993 xprt_set_bound(xprt);
1995 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
1996 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
1999 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2000 xprt_set_bound(xprt);
2002 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2003 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2007 return ERR_PTR(-EAFNOSUPPORT);
2010 dprintk("RPC: set up transport to address %s\n",
2011 xprt->address_strings[RPC_DISPLAY_ALL]);
2013 if (try_module_get(THIS_MODULE))
2018 return ERR_PTR(-EINVAL);
2021 static struct xprt_class xs_udp_transport = {
2022 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2024 .owner = THIS_MODULE,
2025 .ident = IPPROTO_UDP,
2026 .setup = xs_setup_udp,
2029 static struct xprt_class xs_tcp_transport = {
2030 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2032 .owner = THIS_MODULE,
2033 .ident = IPPROTO_TCP,
2034 .setup = xs_setup_tcp,
2038 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2041 int init_socket_xprt(void)
2044 if (!sunrpc_table_header)
2045 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2048 xprt_register_transport(&xs_udp_transport);
2049 xprt_register_transport(&xs_tcp_transport);
2055 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2058 void cleanup_socket_xprt(void)
2061 if (sunrpc_table_header) {
2062 unregister_sysctl_table(sunrpc_table_header);
2063 sunrpc_table_header = NULL;
2067 xprt_unregister_transport(&xs_udp_transport);
2068 xprt_unregister_transport(&xs_tcp_transport);