2 * linux/net/sunrpc/xprtsock.c
4 * Client-side transport implementation for sockets.
6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/pagemap.h>
27 #include <linux/errno.h>
28 #include <linux/socket.h>
30 #include <linux/net.h>
33 #include <linux/udp.h>
34 #include <linux/tcp.h>
35 #include <linux/sunrpc/clnt.h>
36 #include <linux/sunrpc/addr.h>
37 #include <linux/sunrpc/sched.h>
38 #include <linux/sunrpc/svcsock.h>
39 #include <linux/sunrpc/xprtsock.h>
40 #include <linux/file.h>
41 #ifdef CONFIG_SUNRPC_BACKCHANNEL
42 #include <linux/sunrpc/bc_xprt.h>
46 #include <net/checksum.h>
50 #include <trace/events/sunrpc.h>
54 static void xs_close(struct rpc_xprt
*xprt
);
59 static unsigned int xprt_udp_slot_table_entries
= RPC_DEF_SLOT_TABLE
;
60 static unsigned int xprt_tcp_slot_table_entries
= RPC_MIN_SLOT_TABLE
;
61 static unsigned int xprt_max_tcp_slot_table_entries
= RPC_MAX_SLOT_TABLE
;
63 static unsigned int xprt_min_resvport
= RPC_DEF_MIN_RESVPORT
;
64 static unsigned int xprt_max_resvport
= RPC_DEF_MAX_RESVPORT
;
66 #define XS_TCP_LINGER_TO (15U * HZ)
67 static unsigned int xs_tcp_fin_timeout __read_mostly
= XS_TCP_LINGER_TO
;
70 * We can register our own files under /proc/sys/sunrpc by
71 * calling register_sysctl_table() again. The files in that
72 * directory become the union of all files registered there.
74 * We simply need to make sure that we don't collide with
75 * someone else's file names!
78 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
80 static unsigned int min_slot_table_size
= RPC_MIN_SLOT_TABLE
;
81 static unsigned int max_slot_table_size
= RPC_MAX_SLOT_TABLE
;
82 static unsigned int max_tcp_slot_table_limit
= RPC_MAX_SLOT_TABLE_LIMIT
;
83 static unsigned int xprt_min_resvport_limit
= RPC_MIN_RESVPORT
;
84 static unsigned int xprt_max_resvport_limit
= RPC_MAX_RESVPORT
;
86 static struct ctl_table_header
*sunrpc_table_header
;
89 * FIXME: changing the UDP slot table size should also resize the UDP
90 * socket buffers for existing UDP transports
92 static struct ctl_table xs_tunables_table
[] = {
94 .procname
= "udp_slot_table_entries",
95 .data
= &xprt_udp_slot_table_entries
,
96 .maxlen
= sizeof(unsigned int),
98 .proc_handler
= proc_dointvec_minmax
,
99 .extra1
= &min_slot_table_size
,
100 .extra2
= &max_slot_table_size
103 .procname
= "tcp_slot_table_entries",
104 .data
= &xprt_tcp_slot_table_entries
,
105 .maxlen
= sizeof(unsigned int),
107 .proc_handler
= proc_dointvec_minmax
,
108 .extra1
= &min_slot_table_size
,
109 .extra2
= &max_slot_table_size
112 .procname
= "tcp_max_slot_table_entries",
113 .data
= &xprt_max_tcp_slot_table_entries
,
114 .maxlen
= sizeof(unsigned int),
116 .proc_handler
= proc_dointvec_minmax
,
117 .extra1
= &min_slot_table_size
,
118 .extra2
= &max_tcp_slot_table_limit
121 .procname
= "min_resvport",
122 .data
= &xprt_min_resvport
,
123 .maxlen
= sizeof(unsigned int),
125 .proc_handler
= proc_dointvec_minmax
,
126 .extra1
= &xprt_min_resvport_limit
,
127 .extra2
= &xprt_max_resvport_limit
130 .procname
= "max_resvport",
131 .data
= &xprt_max_resvport
,
132 .maxlen
= sizeof(unsigned int),
134 .proc_handler
= proc_dointvec_minmax
,
135 .extra1
= &xprt_min_resvport_limit
,
136 .extra2
= &xprt_max_resvport_limit
139 .procname
= "tcp_fin_timeout",
140 .data
= &xs_tcp_fin_timeout
,
141 .maxlen
= sizeof(xs_tcp_fin_timeout
),
143 .proc_handler
= proc_dointvec_jiffies
,
148 static struct ctl_table sunrpc_table
[] = {
150 .procname
= "sunrpc",
152 .child
= xs_tunables_table
160 * Wait duration for a reply from the RPC portmapper.
162 #define XS_BIND_TO (60U * HZ)
165 * Delay if a UDP socket connect error occurs. This is most likely some
166 * kind of resource problem on the local host.
168 #define XS_UDP_REEST_TO (2U * HZ)
171 * The reestablish timeout allows clients to delay for a bit before attempting
172 * to reconnect to a server that just dropped our connection.
174 * We implement an exponential backoff when trying to reestablish a TCP
175 * transport connection with the server. Some servers like to drop a TCP
176 * connection when they are overworked, so we start with a short timeout and
177 * increase over time if the server is down or not responding.
179 #define XS_TCP_INIT_REEST_TO (3U * HZ)
180 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
183 * TCP idle timeout; client drops the transport socket if it is idle
184 * for this long. Note that we also timeout UDP sockets to prevent
185 * holding port numbers when there is no RPC traffic.
187 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
189 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
190 # undef RPC_DEBUG_DATA
191 # define RPCDBG_FACILITY RPCDBG_TRANS
194 #ifdef RPC_DEBUG_DATA
195 static void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
197 u8
*buf
= (u8
*) packet
;
200 dprintk("RPC: %s\n", msg
);
201 for (j
= 0; j
< count
&& j
< 128; j
+= 4) {
205 dprintk("0x%04x ", j
);
207 dprintk("%02x%02x%02x%02x ",
208 buf
[j
], buf
[j
+1], buf
[j
+2], buf
[j
+3]);
213 static inline void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
219 static inline struct rpc_xprt
*xprt_from_sock(struct sock
*sk
)
221 return (struct rpc_xprt
*) sk
->sk_user_data
;
224 static inline struct sockaddr
*xs_addr(struct rpc_xprt
*xprt
)
226 return (struct sockaddr
*) &xprt
->addr
;
229 static inline struct sockaddr_un
*xs_addr_un(struct rpc_xprt
*xprt
)
231 return (struct sockaddr_un
*) &xprt
->addr
;
234 static inline struct sockaddr_in
*xs_addr_in(struct rpc_xprt
*xprt
)
236 return (struct sockaddr_in
*) &xprt
->addr
;
239 static inline struct sockaddr_in6
*xs_addr_in6(struct rpc_xprt
*xprt
)
241 return (struct sockaddr_in6
*) &xprt
->addr
;
244 static void xs_format_common_peer_addresses(struct rpc_xprt
*xprt
)
246 struct sockaddr
*sap
= xs_addr(xprt
);
247 struct sockaddr_in6
*sin6
;
248 struct sockaddr_in
*sin
;
249 struct sockaddr_un
*sun
;
252 switch (sap
->sa_family
) {
254 sun
= xs_addr_un(xprt
);
255 strlcpy(buf
, sun
->sun_path
, sizeof(buf
));
256 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
257 kstrdup(buf
, GFP_KERNEL
);
260 (void)rpc_ntop(sap
, buf
, sizeof(buf
));
261 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
262 kstrdup(buf
, GFP_KERNEL
);
263 sin
= xs_addr_in(xprt
);
264 snprintf(buf
, sizeof(buf
), "%08x", ntohl(sin
->sin_addr
.s_addr
));
267 (void)rpc_ntop(sap
, buf
, sizeof(buf
));
268 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
269 kstrdup(buf
, GFP_KERNEL
);
270 sin6
= xs_addr_in6(xprt
);
271 snprintf(buf
, sizeof(buf
), "%pi6", &sin6
->sin6_addr
);
277 xprt
->address_strings
[RPC_DISPLAY_HEX_ADDR
] = kstrdup(buf
, GFP_KERNEL
);
280 static void xs_format_common_peer_ports(struct rpc_xprt
*xprt
)
282 struct sockaddr
*sap
= xs_addr(xprt
);
285 snprintf(buf
, sizeof(buf
), "%u", rpc_get_port(sap
));
286 xprt
->address_strings
[RPC_DISPLAY_PORT
] = kstrdup(buf
, GFP_KERNEL
);
288 snprintf(buf
, sizeof(buf
), "%4hx", rpc_get_port(sap
));
289 xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
] = kstrdup(buf
, GFP_KERNEL
);
292 static void xs_format_peer_addresses(struct rpc_xprt
*xprt
,
293 const char *protocol
,
296 xprt
->address_strings
[RPC_DISPLAY_PROTO
] = protocol
;
297 xprt
->address_strings
[RPC_DISPLAY_NETID
] = netid
;
298 xs_format_common_peer_addresses(xprt
);
299 xs_format_common_peer_ports(xprt
);
302 static void xs_update_peer_port(struct rpc_xprt
*xprt
)
304 kfree(xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
]);
305 kfree(xprt
->address_strings
[RPC_DISPLAY_PORT
]);
307 xs_format_common_peer_ports(xprt
);
310 static void xs_free_peer_addresses(struct rpc_xprt
*xprt
)
314 for (i
= 0; i
< RPC_DISPLAY_MAX
; i
++)
316 case RPC_DISPLAY_PROTO
:
317 case RPC_DISPLAY_NETID
:
320 kfree(xprt
->address_strings
[i
]);
324 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
326 static int xs_send_kvec(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct kvec
*vec
, unsigned int base
, int more
)
328 struct msghdr msg
= {
330 .msg_namelen
= addrlen
,
331 .msg_flags
= XS_SENDMSG_FLAGS
| (more
? MSG_MORE
: 0),
334 .iov_base
= vec
->iov_base
+ base
,
335 .iov_len
= vec
->iov_len
- base
,
338 if (iov
.iov_len
!= 0)
339 return kernel_sendmsg(sock
, &msg
, &iov
, 1, iov
.iov_len
);
340 return kernel_sendmsg(sock
, &msg
, NULL
, 0, 0);
343 static int xs_send_pagedata(struct socket
*sock
, struct xdr_buf
*xdr
, unsigned int base
, int more
, bool zerocopy
, int *sent_p
)
345 ssize_t (*do_sendpage
)(struct socket
*sock
, struct page
*page
,
346 int offset
, size_t size
, int flags
);
348 unsigned int remainder
;
351 remainder
= xdr
->page_len
- base
;
352 base
+= xdr
->page_base
;
353 ppage
= xdr
->pages
+ (base
>> PAGE_SHIFT
);
355 do_sendpage
= sock
->ops
->sendpage
;
357 do_sendpage
= sock_no_sendpage
;
359 unsigned int len
= min_t(unsigned int, PAGE_SIZE
- base
, remainder
);
360 int flags
= XS_SENDMSG_FLAGS
;
363 if (remainder
!= 0 || more
)
365 err
= do_sendpage(sock
, *ppage
, base
, len
, flags
);
366 if (remainder
== 0 || err
!= len
)
380 * xs_sendpages - write pages directly to a socket
381 * @sock: socket to send on
382 * @addr: UDP only -- address of destination
383 * @addrlen: UDP only -- length of destination address
384 * @xdr: buffer containing this request
385 * @base: starting position in the buffer
386 * @zerocopy: true if it is safe to use sendpage()
387 * @sent_p: return the total number of bytes successfully queued for sending
390 static int xs_sendpages(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct xdr_buf
*xdr
, unsigned int base
, bool zerocopy
, int *sent_p
)
392 unsigned int remainder
= xdr
->len
- base
;
399 clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
);
405 if (base
< xdr
->head
[0].iov_len
|| addr
!= NULL
) {
406 unsigned int len
= xdr
->head
[0].iov_len
- base
;
408 err
= xs_send_kvec(sock
, addr
, addrlen
, &xdr
->head
[0], base
, remainder
!= 0);
409 if (remainder
== 0 || err
!= len
)
414 base
-= xdr
->head
[0].iov_len
;
416 if (base
< xdr
->page_len
) {
417 unsigned int len
= xdr
->page_len
- base
;
419 err
= xs_send_pagedata(sock
, xdr
, base
, remainder
!= 0, zerocopy
, &sent
);
421 if (remainder
== 0 || sent
!= len
)
425 base
-= xdr
->page_len
;
427 if (base
>= xdr
->tail
[0].iov_len
)
429 err
= xs_send_kvec(sock
, NULL
, 0, &xdr
->tail
[0], base
, 0);
438 static void xs_nospace_callback(struct rpc_task
*task
)
440 struct sock_xprt
*transport
= container_of(task
->tk_rqstp
->rq_xprt
, struct sock_xprt
, xprt
);
442 transport
->inet
->sk_write_pending
--;
443 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
447 * xs_nospace - place task on wait queue if transmit was incomplete
448 * @task: task to put to sleep
451 static int xs_nospace(struct rpc_task
*task
)
453 struct rpc_rqst
*req
= task
->tk_rqstp
;
454 struct rpc_xprt
*xprt
= req
->rq_xprt
;
455 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
456 struct sock
*sk
= transport
->inet
;
459 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
460 task
->tk_pid
, req
->rq_slen
- req
->rq_bytes_sent
,
463 /* Protect against races with write_space */
464 spin_lock_bh(&xprt
->transport_lock
);
466 /* Don't race with disconnect */
467 if (xprt_connected(xprt
)) {
468 if (test_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
)) {
470 * Notify TCP that we're limited by the application
473 set_bit(SOCK_NOSPACE
, &transport
->sock
->flags
);
474 sk
->sk_write_pending
++;
475 /* ...and wait for more buffer space */
476 xprt_wait_for_buffer_space(task
, xs_nospace_callback
);
479 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
483 spin_unlock_bh(&xprt
->transport_lock
);
485 /* Race breaker in case memory is freed before above code is called */
486 sk
->sk_write_space(sk
);
491 * Construct a stream transport record marker in @buf.
493 static inline void xs_encode_stream_record_marker(struct xdr_buf
*buf
)
495 u32 reclen
= buf
->len
- sizeof(rpc_fraghdr
);
496 rpc_fraghdr
*base
= buf
->head
[0].iov_base
;
497 *base
= cpu_to_be32(RPC_LAST_STREAM_FRAGMENT
| reclen
);
501 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
502 * @task: RPC task that manages the state of an RPC request
505 * 0: The request has been sent
506 * EAGAIN: The socket was blocked, please call again later to
507 * complete the request
508 * ENOTCONN: Caller needs to invoke connect logic then call again
509 * other: Some other error occured, the request was not sent
511 static int xs_local_send_request(struct rpc_task
*task
)
513 struct rpc_rqst
*req
= task
->tk_rqstp
;
514 struct rpc_xprt
*xprt
= req
->rq_xprt
;
515 struct sock_xprt
*transport
=
516 container_of(xprt
, struct sock_xprt
, xprt
);
517 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
521 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
523 xs_pktdump("packet data:",
524 req
->rq_svec
->iov_base
, req
->rq_svec
->iov_len
);
526 status
= xs_sendpages(transport
->sock
, NULL
, 0, xdr
, req
->rq_bytes_sent
,
528 dprintk("RPC: %s(%u) = %d\n",
529 __func__
, xdr
->len
- req
->rq_bytes_sent
, status
);
530 if (likely(sent
> 0) || status
== 0) {
531 req
->rq_bytes_sent
+= sent
;
532 req
->rq_xmit_bytes_sent
+= sent
;
533 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
534 req
->rq_bytes_sent
= 0;
543 status
= xs_nospace(task
);
546 dprintk("RPC: sendmsg returned unrecognized error %d\n",
557 * xs_udp_send_request - write an RPC request to a UDP socket
558 * @task: address of RPC task that manages the state of an RPC request
561 * 0: The request has been sent
562 * EAGAIN: The socket was blocked, please call again later to
563 * complete the request
564 * ENOTCONN: Caller needs to invoke connect logic then call again
565 * other: Some other error occurred, the request was not sent
567 static int xs_udp_send_request(struct rpc_task
*task
)
569 struct rpc_rqst
*req
= task
->tk_rqstp
;
570 struct rpc_xprt
*xprt
= req
->rq_xprt
;
571 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
572 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
576 xs_pktdump("packet data:",
577 req
->rq_svec
->iov_base
,
578 req
->rq_svec
->iov_len
);
580 if (!xprt_bound(xprt
))
582 status
= xs_sendpages(transport
->sock
, xs_addr(xprt
), xprt
->addrlen
,
583 xdr
, req
->rq_bytes_sent
, true, &sent
);
585 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
586 xdr
->len
- req
->rq_bytes_sent
, status
);
588 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
589 if (status
== -EPERM
)
592 if (sent
> 0 || status
== 0) {
593 req
->rq_xmit_bytes_sent
+= sent
;
594 if (sent
>= req
->rq_slen
)
596 /* Still some bytes left; set up for a retry later. */
604 /* Should we call xs_close() here? */
607 status
= xs_nospace(task
);
610 dprintk("RPC: sendmsg returned unrecognized error %d\n",
617 /* When the server has died, an ICMP port unreachable message
618 * prompts ECONNREFUSED. */
619 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
626 * xs_tcp_shutdown - gracefully shut down a TCP socket
629 * Initiates a graceful shutdown of the TCP socket by calling the
630 * equivalent of shutdown(SHUT_WR);
632 static void xs_tcp_shutdown(struct rpc_xprt
*xprt
)
634 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
635 struct socket
*sock
= transport
->sock
;
638 kernel_sock_shutdown(sock
, SHUT_WR
);
639 trace_rpc_socket_shutdown(xprt
, sock
);
644 * xs_tcp_send_request - write an RPC request to a TCP socket
645 * @task: address of RPC task that manages the state of an RPC request
648 * 0: The request has been sent
649 * EAGAIN: The socket was blocked, please call again later to
650 * complete the request
651 * ENOTCONN: Caller needs to invoke connect logic then call again
652 * other: Some other error occurred, the request was not sent
654 * XXX: In the case of soft timeouts, should we eventually give up
655 * if sendmsg is not able to make progress?
657 static int xs_tcp_send_request(struct rpc_task
*task
)
659 struct rpc_rqst
*req
= task
->tk_rqstp
;
660 struct rpc_xprt
*xprt
= req
->rq_xprt
;
661 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
662 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
663 bool zerocopy
= true;
667 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
669 xs_pktdump("packet data:",
670 req
->rq_svec
->iov_base
,
671 req
->rq_svec
->iov_len
);
672 /* Don't use zero copy if this is a resend. If the RPC call
673 * completes while the socket holds a reference to the pages,
674 * then we may end up resending corrupted data.
676 if (task
->tk_flags
& RPC_TASK_SENT
)
679 /* Continue transmitting the packet/record. We must be careful
680 * to cope with writespace callbacks arriving _after_ we have
681 * called sendmsg(). */
684 status
= xs_sendpages(transport
->sock
, NULL
, 0, xdr
,
685 req
->rq_bytes_sent
, zerocopy
, &sent
);
687 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
688 xdr
->len
- req
->rq_bytes_sent
, status
);
690 if (unlikely(sent
== 0 && status
< 0))
693 /* If we've sent the entire packet, immediately
694 * reset the count of bytes sent. */
695 req
->rq_bytes_sent
+= sent
;
696 req
->rq_xmit_bytes_sent
+= sent
;
697 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
698 req
->rq_bytes_sent
= 0;
711 /* Should we call xs_close() here? */
715 status
= xs_nospace(task
);
718 dprintk("RPC: sendmsg returned unrecognized error %d\n",
721 xs_tcp_shutdown(xprt
);
726 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
733 * xs_tcp_release_xprt - clean up after a tcp transmission
737 * This cleans up if an error causes us to abort the transmission of a request.
738 * In this case, the socket may need to be reset in order to avoid confusing
741 static void xs_tcp_release_xprt(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
743 struct rpc_rqst
*req
;
745 if (task
!= xprt
->snd_task
)
749 req
= task
->tk_rqstp
;
752 if (req
->rq_bytes_sent
== 0)
754 if (req
->rq_bytes_sent
== req
->rq_snd_buf
.len
)
756 set_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
758 xprt_release_xprt(xprt
, task
);
761 static void xs_save_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
763 transport
->old_data_ready
= sk
->sk_data_ready
;
764 transport
->old_state_change
= sk
->sk_state_change
;
765 transport
->old_write_space
= sk
->sk_write_space
;
766 transport
->old_error_report
= sk
->sk_error_report
;
769 static void xs_restore_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
771 sk
->sk_data_ready
= transport
->old_data_ready
;
772 sk
->sk_state_change
= transport
->old_state_change
;
773 sk
->sk_write_space
= transport
->old_write_space
;
774 sk
->sk_error_report
= transport
->old_error_report
;
778 * xs_error_report - callback to handle TCP socket state errors
781 * Note: we don't call sock_error() since there may be a rpc_task
782 * using the socket, and so we don't want to clear sk->sk_err.
784 static void xs_error_report(struct sock
*sk
)
786 struct rpc_xprt
*xprt
;
789 read_lock_bh(&sk
->sk_callback_lock
);
790 if (!(xprt
= xprt_from_sock(sk
)))
796 dprintk("RPC: xs_error_report client %p, error=%d...\n",
798 trace_rpc_socket_error(xprt
, sk
->sk_socket
, err
);
799 if (test_bit(XPRT_CONNECTION_REUSE
, &xprt
->state
))
801 xprt_wake_pending_tasks(xprt
, err
);
803 read_unlock_bh(&sk
->sk_callback_lock
);
806 static void xs_sock_reset_connection_flags(struct rpc_xprt
*xprt
)
808 smp_mb__before_atomic();
809 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
810 clear_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
);
811 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
812 clear_bit(XPRT_CLOSING
, &xprt
->state
);
813 smp_mb__after_atomic();
816 static void xs_reset_transport(struct sock_xprt
*transport
)
818 struct socket
*sock
= transport
->sock
;
819 struct sock
*sk
= transport
->inet
;
820 struct rpc_xprt
*xprt
= &transport
->xprt
;
825 write_lock_bh(&sk
->sk_callback_lock
);
826 transport
->inet
= NULL
;
827 transport
->sock
= NULL
;
829 sk
->sk_user_data
= NULL
;
831 xs_restore_old_callbacks(transport
, sk
);
832 write_unlock_bh(&sk
->sk_callback_lock
);
833 xs_sock_reset_connection_flags(xprt
);
835 trace_rpc_socket_close(xprt
, sock
);
840 * xs_close - close a socket
843 * This is used when all requests are complete; ie, no DRC state remains
844 * on the server we want to save.
846 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
847 * xs_reset_transport() zeroing the socket from underneath a writer.
849 static void xs_close(struct rpc_xprt
*xprt
)
851 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
853 dprintk("RPC: xs_close xprt %p\n", xprt
);
855 cancel_delayed_work_sync(&transport
->connect_worker
);
857 xs_reset_transport(transport
);
858 xprt
->reestablish_timeout
= 0;
860 xprt_disconnect_done(xprt
);
863 static void xs_tcp_close(struct rpc_xprt
*xprt
)
865 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
))
868 xs_tcp_shutdown(xprt
);
871 static void xs_xprt_free(struct rpc_xprt
*xprt
)
873 xs_free_peer_addresses(xprt
);
878 * xs_destroy - prepare to shutdown a transport
879 * @xprt: doomed transport
882 static void xs_destroy(struct rpc_xprt
*xprt
)
884 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
888 module_put(THIS_MODULE
);
891 static int xs_local_copy_to_xdr(struct xdr_buf
*xdr
, struct sk_buff
*skb
)
893 struct xdr_skb_reader desc
= {
895 .offset
= sizeof(rpc_fraghdr
),
896 .count
= skb
->len
- sizeof(rpc_fraghdr
),
899 if (xdr_partial_copy_from_skb(xdr
, 0, &desc
, xdr_skb_read_bits
) < 0)
907 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
908 * @sk: socket with data to read
909 * @len: how much data to read
911 * Currently this assumes we can read the whole reply in a single gulp.
913 static void xs_local_data_ready(struct sock
*sk
)
915 struct rpc_task
*task
;
916 struct rpc_xprt
*xprt
;
917 struct rpc_rqst
*rovr
;
919 int err
, repsize
, copied
;
923 read_lock_bh(&sk
->sk_callback_lock
);
924 dprintk("RPC: %s...\n", __func__
);
925 xprt
= xprt_from_sock(sk
);
929 skb
= skb_recv_datagram(sk
, 0, 1, &err
);
933 repsize
= skb
->len
- sizeof(rpc_fraghdr
);
935 dprintk("RPC: impossible RPC reply size %d\n", repsize
);
939 /* Copy the XID from the skb... */
940 xp
= skb_header_pointer(skb
, sizeof(rpc_fraghdr
), sizeof(_xid
), &_xid
);
944 /* Look up and lock the request corresponding to the given XID */
945 spin_lock(&xprt
->transport_lock
);
946 rovr
= xprt_lookup_rqst(xprt
, *xp
);
949 task
= rovr
->rq_task
;
951 copied
= rovr
->rq_private_buf
.buflen
;
952 if (copied
> repsize
)
955 if (xs_local_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
956 dprintk("RPC: sk_buff copy failed\n");
960 xprt_complete_rqst(task
, copied
);
963 spin_unlock(&xprt
->transport_lock
);
965 skb_free_datagram(sk
, skb
);
967 read_unlock_bh(&sk
->sk_callback_lock
);
971 * xs_udp_data_ready - "data ready" callback for UDP sockets
972 * @sk: socket with data to read
973 * @len: how much data to read
976 static void xs_udp_data_ready(struct sock
*sk
)
978 struct rpc_task
*task
;
979 struct rpc_xprt
*xprt
;
980 struct rpc_rqst
*rovr
;
982 int err
, repsize
, copied
;
986 read_lock_bh(&sk
->sk_callback_lock
);
987 dprintk("RPC: xs_udp_data_ready...\n");
988 if (!(xprt
= xprt_from_sock(sk
)))
991 if ((skb
= skb_recv_datagram(sk
, 0, 1, &err
)) == NULL
)
994 repsize
= skb
->len
- sizeof(struct udphdr
);
996 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
1000 /* Copy the XID from the skb... */
1001 xp
= skb_header_pointer(skb
, sizeof(struct udphdr
),
1002 sizeof(_xid
), &_xid
);
1006 /* Look up and lock the request corresponding to the given XID */
1007 spin_lock(&xprt
->transport_lock
);
1008 rovr
= xprt_lookup_rqst(xprt
, *xp
);
1011 task
= rovr
->rq_task
;
1013 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
1016 /* Suck it into the iovec, verify checksum if not done by hw. */
1017 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
1018 UDPX_INC_STATS_BH(sk
, UDP_MIB_INERRORS
);
1022 UDPX_INC_STATS_BH(sk
, UDP_MIB_INDATAGRAMS
);
1024 xprt_adjust_cwnd(xprt
, task
, copied
);
1025 xprt_complete_rqst(task
, copied
);
1028 spin_unlock(&xprt
->transport_lock
);
1030 skb_free_datagram(sk
, skb
);
1032 read_unlock_bh(&sk
->sk_callback_lock
);
1036 * Helper function to force a TCP close if the server is sending
1037 * junk and/or it has put us in CLOSE_WAIT
1039 static void xs_tcp_force_close(struct rpc_xprt
*xprt
)
1041 set_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
);
1042 xprt_force_disconnect(xprt
);
1045 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
1047 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1051 p
= ((char *) &transport
->tcp_fraghdr
) + transport
->tcp_offset
;
1052 len
= sizeof(transport
->tcp_fraghdr
) - transport
->tcp_offset
;
1053 used
= xdr_skb_read_bits(desc
, p
, len
);
1054 transport
->tcp_offset
+= used
;
1058 transport
->tcp_reclen
= ntohl(transport
->tcp_fraghdr
);
1059 if (transport
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
1060 transport
->tcp_flags
|= TCP_RCV_LAST_FRAG
;
1062 transport
->tcp_flags
&= ~TCP_RCV_LAST_FRAG
;
1063 transport
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
1065 transport
->tcp_flags
&= ~TCP_RCV_COPY_FRAGHDR
;
1066 transport
->tcp_offset
= 0;
1068 /* Sanity check of the record length */
1069 if (unlikely(transport
->tcp_reclen
< 8)) {
1070 dprintk("RPC: invalid TCP record fragment length\n");
1071 xs_tcp_force_close(xprt
);
1074 dprintk("RPC: reading TCP record fragment of length %d\n",
1075 transport
->tcp_reclen
);
1078 static void xs_tcp_check_fraghdr(struct sock_xprt
*transport
)
1080 if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1081 transport
->tcp_flags
|= TCP_RCV_COPY_FRAGHDR
;
1082 transport
->tcp_offset
= 0;
1083 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
) {
1084 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1085 transport
->tcp_flags
|= TCP_RCV_COPY_XID
;
1086 transport
->tcp_copied
= 0;
1091 static inline void xs_tcp_read_xid(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1096 len
= sizeof(transport
->tcp_xid
) - transport
->tcp_offset
;
1097 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
1098 p
= ((char *) &transport
->tcp_xid
) + transport
->tcp_offset
;
1099 used
= xdr_skb_read_bits(desc
, p
, len
);
1100 transport
->tcp_offset
+= used
;
1103 transport
->tcp_flags
&= ~TCP_RCV_COPY_XID
;
1104 transport
->tcp_flags
|= TCP_RCV_READ_CALLDIR
;
1105 transport
->tcp_copied
= 4;
1106 dprintk("RPC: reading %s XID %08x\n",
1107 (transport
->tcp_flags
& TCP_RPC_REPLY
) ? "reply for"
1109 ntohl(transport
->tcp_xid
));
1110 xs_tcp_check_fraghdr(transport
);
1113 static inline void xs_tcp_read_calldir(struct sock_xprt
*transport
,
1114 struct xdr_skb_reader
*desc
)
1121 * We want transport->tcp_offset to be 8 at the end of this routine
1122 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1123 * When this function is called for the first time,
1124 * transport->tcp_offset is 4 (after having already read the xid).
1126 offset
= transport
->tcp_offset
- sizeof(transport
->tcp_xid
);
1127 len
= sizeof(transport
->tcp_calldir
) - offset
;
1128 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len
);
1129 p
= ((char *) &transport
->tcp_calldir
) + offset
;
1130 used
= xdr_skb_read_bits(desc
, p
, len
);
1131 transport
->tcp_offset
+= used
;
1134 transport
->tcp_flags
&= ~TCP_RCV_READ_CALLDIR
;
1136 * We don't yet have the XDR buffer, so we will write the calldir
1137 * out after we get the buffer from the 'struct rpc_rqst'
1139 switch (ntohl(transport
->tcp_calldir
)) {
1141 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1142 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1143 transport
->tcp_flags
|= TCP_RPC_REPLY
;
1146 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1147 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1148 transport
->tcp_flags
&= ~TCP_RPC_REPLY
;
1151 dprintk("RPC: invalid request message type\n");
1152 xs_tcp_force_close(&transport
->xprt
);
1154 xs_tcp_check_fraghdr(transport
);
1157 static inline void xs_tcp_read_common(struct rpc_xprt
*xprt
,
1158 struct xdr_skb_reader
*desc
,
1159 struct rpc_rqst
*req
)
1161 struct sock_xprt
*transport
=
1162 container_of(xprt
, struct sock_xprt
, xprt
);
1163 struct xdr_buf
*rcvbuf
;
1167 rcvbuf
= &req
->rq_private_buf
;
1169 if (transport
->tcp_flags
& TCP_RCV_COPY_CALLDIR
) {
1171 * Save the RPC direction in the XDR buffer
1173 memcpy(rcvbuf
->head
[0].iov_base
+ transport
->tcp_copied
,
1174 &transport
->tcp_calldir
,
1175 sizeof(transport
->tcp_calldir
));
1176 transport
->tcp_copied
+= sizeof(transport
->tcp_calldir
);
1177 transport
->tcp_flags
&= ~TCP_RCV_COPY_CALLDIR
;
1181 if (len
> transport
->tcp_reclen
- transport
->tcp_offset
) {
1182 struct xdr_skb_reader my_desc
;
1184 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1185 memcpy(&my_desc
, desc
, sizeof(my_desc
));
1186 my_desc
.count
= len
;
1187 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1188 &my_desc
, xdr_skb_read_bits
);
1192 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1193 desc
, xdr_skb_read_bits
);
1196 transport
->tcp_copied
+= r
;
1197 transport
->tcp_offset
+= r
;
1200 /* Error when copying to the receive buffer,
1201 * usually because we weren't able to allocate
1202 * additional buffer pages. All we can do now
1203 * is turn off TCP_RCV_COPY_DATA, so the request
1204 * will not receive any additional updates,
1206 * Any remaining data from this record will
1209 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1210 dprintk("RPC: XID %08x truncated request\n",
1211 ntohl(transport
->tcp_xid
));
1212 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1213 "tcp_offset = %u, tcp_reclen = %u\n",
1214 xprt
, transport
->tcp_copied
,
1215 transport
->tcp_offset
, transport
->tcp_reclen
);
1219 dprintk("RPC: XID %08x read %Zd bytes\n",
1220 ntohl(transport
->tcp_xid
), r
);
1221 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1222 "tcp_reclen = %u\n", xprt
, transport
->tcp_copied
,
1223 transport
->tcp_offset
, transport
->tcp_reclen
);
1225 if (transport
->tcp_copied
== req
->rq_private_buf
.buflen
)
1226 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1227 else if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1228 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
)
1229 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1234 * Finds the request corresponding to the RPC xid and invokes the common
1235 * tcp read code to read the data.
1237 static inline int xs_tcp_read_reply(struct rpc_xprt
*xprt
,
1238 struct xdr_skb_reader
*desc
)
1240 struct sock_xprt
*transport
=
1241 container_of(xprt
, struct sock_xprt
, xprt
);
1242 struct rpc_rqst
*req
;
1244 dprintk("RPC: read reply XID %08x\n", ntohl(transport
->tcp_xid
));
1246 /* Find and lock the request corresponding to this xid */
1247 spin_lock(&xprt
->transport_lock
);
1248 req
= xprt_lookup_rqst(xprt
, transport
->tcp_xid
);
1250 dprintk("RPC: XID %08x request not found!\n",
1251 ntohl(transport
->tcp_xid
));
1252 spin_unlock(&xprt
->transport_lock
);
1256 xs_tcp_read_common(xprt
, desc
, req
);
1258 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1259 xprt_complete_rqst(req
->rq_task
, transport
->tcp_copied
);
1261 spin_unlock(&xprt
->transport_lock
);
1265 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1267 * Obtains an rpc_rqst previously allocated and invokes the common
1268 * tcp read code to read the data. The result is placed in the callback
1270 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1271 * connection and return -1.
1273 static int xs_tcp_read_callback(struct rpc_xprt
*xprt
,
1274 struct xdr_skb_reader
*desc
)
1276 struct sock_xprt
*transport
=
1277 container_of(xprt
, struct sock_xprt
, xprt
);
1278 struct rpc_rqst
*req
;
1280 /* Look up and lock the request corresponding to the given XID */
1281 spin_lock(&xprt
->transport_lock
);
1282 req
= xprt_lookup_bc_request(xprt
, transport
->tcp_xid
);
1284 spin_unlock(&xprt
->transport_lock
);
1285 printk(KERN_WARNING
"Callback slot table overflowed\n");
1286 xprt_force_disconnect(xprt
);
1290 dprintk("RPC: read callback XID %08x\n", ntohl(req
->rq_xid
));
1291 xs_tcp_read_common(xprt
, desc
, req
);
1293 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1294 xprt_complete_bc_request(req
, transport
->tcp_copied
);
1295 spin_unlock(&xprt
->transport_lock
);
1300 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1301 struct xdr_skb_reader
*desc
)
1303 struct sock_xprt
*transport
=
1304 container_of(xprt
, struct sock_xprt
, xprt
);
1306 return (transport
->tcp_flags
& TCP_RPC_REPLY
) ?
1307 xs_tcp_read_reply(xprt
, desc
) :
1308 xs_tcp_read_callback(xprt
, desc
);
1311 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1312 struct xdr_skb_reader
*desc
)
1314 return xs_tcp_read_reply(xprt
, desc
);
1316 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1319 * Read data off the transport. This can be either an RPC_CALL or an
1320 * RPC_REPLY. Relay the processing to helper functions.
1322 static void xs_tcp_read_data(struct rpc_xprt
*xprt
,
1323 struct xdr_skb_reader
*desc
)
1325 struct sock_xprt
*transport
=
1326 container_of(xprt
, struct sock_xprt
, xprt
);
1328 if (_xs_tcp_read_data(xprt
, desc
) == 0)
1329 xs_tcp_check_fraghdr(transport
);
1332 * The transport_lock protects the request handling.
1333 * There's no need to hold it to update the tcp_flags.
1335 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1339 static inline void xs_tcp_read_discard(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1343 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1344 if (len
> desc
->count
)
1347 desc
->offset
+= len
;
1348 transport
->tcp_offset
+= len
;
1349 dprintk("RPC: discarded %Zu bytes\n", len
);
1350 xs_tcp_check_fraghdr(transport
);
1353 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
1355 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
1356 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1357 struct xdr_skb_reader desc
= {
1363 dprintk("RPC: xs_tcp_data_recv started\n");
1365 trace_xs_tcp_data_recv(transport
);
1366 /* Read in a new fragment marker if necessary */
1367 /* Can we ever really expect to get completely empty fragments? */
1368 if (transport
->tcp_flags
& TCP_RCV_COPY_FRAGHDR
) {
1369 xs_tcp_read_fraghdr(xprt
, &desc
);
1372 /* Read in the xid if necessary */
1373 if (transport
->tcp_flags
& TCP_RCV_COPY_XID
) {
1374 xs_tcp_read_xid(transport
, &desc
);
1377 /* Read in the call/reply flag */
1378 if (transport
->tcp_flags
& TCP_RCV_READ_CALLDIR
) {
1379 xs_tcp_read_calldir(transport
, &desc
);
1382 /* Read in the request data */
1383 if (transport
->tcp_flags
& TCP_RCV_COPY_DATA
) {
1384 xs_tcp_read_data(xprt
, &desc
);
1387 /* Skip over any trailing bytes on short reads */
1388 xs_tcp_read_discard(transport
, &desc
);
1389 } while (desc
.count
);
1390 trace_xs_tcp_data_recv(transport
);
1391 dprintk("RPC: xs_tcp_data_recv done\n");
1392 return len
- desc
.count
;
1396 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1397 * @sk: socket with data to read
1398 * @bytes: how much data to read
1401 static void xs_tcp_data_ready(struct sock
*sk
)
1403 struct rpc_xprt
*xprt
;
1404 read_descriptor_t rd_desc
;
1406 unsigned long total
= 0;
1408 dprintk("RPC: xs_tcp_data_ready...\n");
1410 read_lock_bh(&sk
->sk_callback_lock
);
1411 if (!(xprt
= xprt_from_sock(sk
))) {
1415 /* Any data means we had a useful conversation, so
1416 * the we don't need to delay the next reconnect
1418 if (xprt
->reestablish_timeout
)
1419 xprt
->reestablish_timeout
= 0;
1421 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1422 rd_desc
.arg
.data
= xprt
;
1424 rd_desc
.count
= 65536;
1425 read
= tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
1430 trace_xs_tcp_data_ready(xprt
, read
, total
);
1431 read_unlock_bh(&sk
->sk_callback_lock
);
1435 * Do the equivalent of linger/linger2 handling for dealing with
1436 * broken servers that don't close the socket in a timely
1439 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt
*xprt
,
1440 unsigned long timeout
)
1442 struct sock_xprt
*transport
;
1444 if (xprt_test_and_set_connecting(xprt
))
1446 set_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1447 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1448 queue_delayed_work(rpciod_workqueue
, &transport
->connect_worker
,
1452 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt
*xprt
)
1454 struct sock_xprt
*transport
;
1456 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1458 if (!test_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
) ||
1459 !cancel_delayed_work(&transport
->connect_worker
))
1461 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1462 xprt_clear_connecting(xprt
);
1465 static void xs_sock_mark_closed(struct rpc_xprt
*xprt
)
1467 xs_sock_reset_connection_flags(xprt
);
1468 /* Mark transport as closed and wake up all pending tasks */
1469 xprt_disconnect_done(xprt
);
1473 * xs_tcp_state_change - callback to handle TCP socket state changes
1474 * @sk: socket whose state has changed
1477 static void xs_tcp_state_change(struct sock
*sk
)
1479 struct rpc_xprt
*xprt
;
1481 read_lock_bh(&sk
->sk_callback_lock
);
1482 if (!(xprt
= xprt_from_sock(sk
)))
1484 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
1485 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1486 sk
->sk_state
, xprt_connected(xprt
),
1487 sock_flag(sk
, SOCK_DEAD
),
1488 sock_flag(sk
, SOCK_ZAPPED
),
1491 trace_rpc_socket_state_change(xprt
, sk
->sk_socket
);
1492 switch (sk
->sk_state
) {
1493 case TCP_ESTABLISHED
:
1494 spin_lock(&xprt
->transport_lock
);
1495 if (!xprt_test_and_set_connected(xprt
)) {
1496 struct sock_xprt
*transport
= container_of(xprt
,
1497 struct sock_xprt
, xprt
);
1499 /* Reset TCP record info */
1500 transport
->tcp_offset
= 0;
1501 transport
->tcp_reclen
= 0;
1502 transport
->tcp_copied
= 0;
1503 transport
->tcp_flags
=
1504 TCP_RCV_COPY_FRAGHDR
| TCP_RCV_COPY_XID
;
1505 xprt
->connect_cookie
++;
1507 xprt_wake_pending_tasks(xprt
, -EAGAIN
);
1509 spin_unlock(&xprt
->transport_lock
);
1512 /* The client initiated a shutdown of the socket */
1513 xprt
->connect_cookie
++;
1514 xprt
->reestablish_timeout
= 0;
1515 set_bit(XPRT_CLOSING
, &xprt
->state
);
1516 smp_mb__before_atomic();
1517 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1518 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1519 smp_mb__after_atomic();
1520 xs_tcp_schedule_linger_timeout(xprt
, xs_tcp_fin_timeout
);
1522 case TCP_CLOSE_WAIT
:
1523 /* The server initiated a shutdown of the socket */
1524 xprt
->connect_cookie
++;
1525 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1526 xs_tcp_force_close(xprt
);
1529 * If the server closed down the connection, make sure that
1530 * we back off before reconnecting
1532 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
1533 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1536 set_bit(XPRT_CLOSING
, &xprt
->state
);
1537 xs_tcp_schedule_linger_timeout(xprt
, xs_tcp_fin_timeout
);
1538 smp_mb__before_atomic();
1539 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1540 smp_mb__after_atomic();
1543 xs_tcp_cancel_linger_timeout(xprt
);
1544 xs_sock_mark_closed(xprt
);
1547 read_unlock_bh(&sk
->sk_callback_lock
);
1550 static void xs_write_space(struct sock
*sk
)
1552 struct socket
*sock
;
1553 struct rpc_xprt
*xprt
;
1555 if (unlikely(!(sock
= sk
->sk_socket
)))
1557 clear_bit(SOCK_NOSPACE
, &sock
->flags
);
1559 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1561 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
) == 0)
1564 xprt_write_space(xprt
);
1568 * xs_udp_write_space - callback invoked when socket buffer space
1570 * @sk: socket whose state has changed
1572 * Called when more output buffer space is available for this socket.
1573 * We try not to wake our writers until they can make "significant"
1574 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1575 * with a bunch of small requests.
1577 static void xs_udp_write_space(struct sock
*sk
)
1579 read_lock_bh(&sk
->sk_callback_lock
);
1581 /* from net/core/sock.c:sock_def_write_space */
1582 if (sock_writeable(sk
))
1585 read_unlock_bh(&sk
->sk_callback_lock
);
1589 * xs_tcp_write_space - callback invoked when socket buffer space
1591 * @sk: socket whose state has changed
1593 * Called when more output buffer space is available for this socket.
1594 * We try not to wake our writers until they can make "significant"
1595 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1596 * with a bunch of small requests.
1598 static void xs_tcp_write_space(struct sock
*sk
)
1600 read_lock_bh(&sk
->sk_callback_lock
);
1602 /* from net/core/stream.c:sk_stream_write_space */
1603 if (sk_stream_is_writeable(sk
))
1606 read_unlock_bh(&sk
->sk_callback_lock
);
1609 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1611 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1612 struct sock
*sk
= transport
->inet
;
1614 if (transport
->rcvsize
) {
1615 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1616 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1618 if (transport
->sndsize
) {
1619 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1620 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1621 sk
->sk_write_space(sk
);
1626 * xs_udp_set_buffer_size - set send and receive limits
1627 * @xprt: generic transport
1628 * @sndsize: requested size of send buffer, in bytes
1629 * @rcvsize: requested size of receive buffer, in bytes
1631 * Set socket send and receive buffer size limits.
1633 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1635 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1637 transport
->sndsize
= 0;
1639 transport
->sndsize
= sndsize
+ 1024;
1640 transport
->rcvsize
= 0;
1642 transport
->rcvsize
= rcvsize
+ 1024;
1644 xs_udp_do_set_buffer_size(xprt
);
1648 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1649 * @task: task that timed out
1651 * Adjust the congestion window after a retransmit timeout has occurred.
1653 static void xs_udp_timer(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1655 xprt_adjust_cwnd(xprt
, task
, -ETIMEDOUT
);
1658 static unsigned short xs_get_random_port(void)
1660 unsigned short range
= xprt_max_resvport
- xprt_min_resvport
;
1661 unsigned short rand
= (unsigned short) prandom_u32() % range
;
1662 return rand
+ xprt_min_resvport
;
1666 * xs_set_reuseaddr_port - set the socket's port and address reuse options
1669 * Note that this function has to be called on all sockets that share the
1670 * same port, and it must be called before binding.
1672 static void xs_sock_set_reuseport(struct socket
*sock
)
1676 kernel_setsockopt(sock
, SOL_SOCKET
, SO_REUSEPORT
, &opt
, sizeof(opt
));
1679 static unsigned short xs_sock_getport(struct socket
*sock
)
1681 struct sockaddr_storage buf
;
1683 unsigned short port
= 0;
1685 if (kernel_getsockname(sock
, (struct sockaddr
*)&buf
, &buflen
) < 0)
1687 switch (buf
.ss_family
) {
1689 port
= ntohs(((struct sockaddr_in6
*)&buf
)->sin6_port
);
1692 port
= ntohs(((struct sockaddr_in
*)&buf
)->sin_port
);
1699 * xs_set_port - reset the port number in the remote endpoint address
1700 * @xprt: generic transport
1701 * @port: new port number
1704 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1706 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1708 rpc_set_port(xs_addr(xprt
), port
);
1709 xs_update_peer_port(xprt
);
1712 static void xs_set_srcport(struct sock_xprt
*transport
, struct socket
*sock
)
1714 if (transport
->srcport
== 0)
1715 transport
->srcport
= xs_sock_getport(sock
);
1718 static unsigned short xs_get_srcport(struct sock_xprt
*transport
)
1720 unsigned short port
= transport
->srcport
;
1722 if (port
== 0 && transport
->xprt
.resvport
)
1723 port
= xs_get_random_port();
1727 static unsigned short xs_next_srcport(struct sock_xprt
*transport
, unsigned short port
)
1729 if (transport
->srcport
!= 0)
1730 transport
->srcport
= 0;
1731 if (!transport
->xprt
.resvport
)
1733 if (port
<= xprt_min_resvport
|| port
> xprt_max_resvport
)
1734 return xprt_max_resvport
;
1737 static int xs_bind(struct sock_xprt
*transport
, struct socket
*sock
)
1739 struct sockaddr_storage myaddr
;
1741 unsigned short port
= xs_get_srcport(transport
);
1742 unsigned short last
;
1745 * If we are asking for any ephemeral port (i.e. port == 0 &&
1746 * transport->xprt.resvport == 0), don't bind. Let the local
1747 * port selection happen implicitly when the socket is used
1748 * (for example at connect time).
1750 * This ensures that we can continue to establish TCP
1751 * connections even when all local ephemeral ports are already
1752 * a part of some TCP connection. This makes no difference
1753 * for UDP sockets, but also doens't harm them.
1755 * If we're asking for any reserved port (i.e. port == 0 &&
1756 * transport->xprt.resvport == 1) xs_get_srcport above will
1757 * ensure that port is non-zero and we will bind as needed.
1762 memcpy(&myaddr
, &transport
->srcaddr
, transport
->xprt
.addrlen
);
1764 rpc_set_port((struct sockaddr
*)&myaddr
, port
);
1765 err
= kernel_bind(sock
, (struct sockaddr
*)&myaddr
,
1766 transport
->xprt
.addrlen
);
1768 transport
->srcport
= port
;
1772 port
= xs_next_srcport(transport
, port
);
1775 } while (err
== -EADDRINUSE
&& nloop
!= 2);
1777 if (myaddr
.ss_family
== AF_INET
)
1778 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__
,
1779 &((struct sockaddr_in
*)&myaddr
)->sin_addr
,
1780 port
, err
? "failed" : "ok", err
);
1782 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__
,
1783 &((struct sockaddr_in6
*)&myaddr
)->sin6_addr
,
1784 port
, err
? "failed" : "ok", err
);
1789 * We don't support autobind on AF_LOCAL sockets
1791 static void xs_local_rpcbind(struct rpc_task
*task
)
1794 xprt_set_bound(rcu_dereference(task
->tk_client
->cl_xprt
));
1798 static void xs_local_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1802 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1803 static struct lock_class_key xs_key
[2];
1804 static struct lock_class_key xs_slock_key
[2];
1806 static inline void xs_reclassify_socketu(struct socket
*sock
)
1808 struct sock
*sk
= sock
->sk
;
1810 sock_lock_init_class_and_name(sk
, "slock-AF_LOCAL-RPC",
1811 &xs_slock_key
[1], "sk_lock-AF_LOCAL-RPC", &xs_key
[1]);
1814 static inline void xs_reclassify_socket4(struct socket
*sock
)
1816 struct sock
*sk
= sock
->sk
;
1818 sock_lock_init_class_and_name(sk
, "slock-AF_INET-RPC",
1819 &xs_slock_key
[0], "sk_lock-AF_INET-RPC", &xs_key
[0]);
1822 static inline void xs_reclassify_socket6(struct socket
*sock
)
1824 struct sock
*sk
= sock
->sk
;
1826 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-RPC",
1827 &xs_slock_key
[1], "sk_lock-AF_INET6-RPC", &xs_key
[1]);
1830 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1832 WARN_ON_ONCE(sock_owned_by_user(sock
->sk
));
1833 if (sock_owned_by_user(sock
->sk
))
1838 xs_reclassify_socketu(sock
);
1841 xs_reclassify_socket4(sock
);
1844 xs_reclassify_socket6(sock
);
1849 static inline void xs_reclassify_socketu(struct socket
*sock
)
1853 static inline void xs_reclassify_socket4(struct socket
*sock
)
1857 static inline void xs_reclassify_socket6(struct socket
*sock
)
1861 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1866 static void xs_dummy_setup_socket(struct work_struct
*work
)
1870 static struct socket
*xs_create_sock(struct rpc_xprt
*xprt
,
1871 struct sock_xprt
*transport
, int family
, int type
,
1872 int protocol
, bool reuseport
)
1874 struct socket
*sock
;
1877 err
= __sock_create(xprt
->xprt_net
, family
, type
, protocol
, &sock
, 1);
1879 dprintk("RPC: can't create %d transport socket (%d).\n",
1883 xs_reclassify_socket(family
, sock
);
1886 xs_sock_set_reuseport(sock
);
1888 err
= xs_bind(transport
, sock
);
1896 return ERR_PTR(err
);
1899 static int xs_local_finish_connecting(struct rpc_xprt
*xprt
,
1900 struct socket
*sock
)
1902 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1905 if (!transport
->inet
) {
1906 struct sock
*sk
= sock
->sk
;
1908 write_lock_bh(&sk
->sk_callback_lock
);
1910 xs_save_old_callbacks(transport
, sk
);
1912 sk
->sk_user_data
= xprt
;
1913 sk
->sk_data_ready
= xs_local_data_ready
;
1914 sk
->sk_write_space
= xs_udp_write_space
;
1915 sk
->sk_error_report
= xs_error_report
;
1916 sk
->sk_allocation
= GFP_ATOMIC
;
1918 xprt_clear_connected(xprt
);
1920 /* Reset to new socket */
1921 transport
->sock
= sock
;
1922 transport
->inet
= sk
;
1924 write_unlock_bh(&sk
->sk_callback_lock
);
1927 /* Tell the socket layer to start connecting... */
1928 xprt
->stat
.connect_count
++;
1929 xprt
->stat
.connect_start
= jiffies
;
1930 return kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, 0);
1934 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1935 * @xprt: RPC transport to connect
1936 * @transport: socket transport to connect
1937 * @create_sock: function to create a socket of the correct type
1939 static int xs_local_setup_socket(struct sock_xprt
*transport
)
1941 struct rpc_xprt
*xprt
= &transport
->xprt
;
1942 struct socket
*sock
;
1945 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1946 status
= __sock_create(xprt
->xprt_net
, AF_LOCAL
,
1947 SOCK_STREAM
, 0, &sock
, 1);
1949 dprintk("RPC: can't create AF_LOCAL "
1950 "transport socket (%d).\n", -status
);
1953 xs_reclassify_socketu(sock
);
1955 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1956 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1958 status
= xs_local_finish_connecting(xprt
, sock
);
1959 trace_rpc_socket_connect(xprt
, sock
, status
);
1962 dprintk("RPC: xprt %p connected to %s\n",
1963 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1964 xprt_set_connected(xprt
);
1968 dprintk("RPC: xprt %p: socket %s does not exist\n",
1969 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1972 dprintk("RPC: xprt %p: connection refused for %s\n",
1973 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1976 printk(KERN_ERR
"%s: unhandled error (%d) connecting to %s\n",
1978 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1982 xprt_clear_connecting(xprt
);
1983 xprt_wake_pending_tasks(xprt
, status
);
1987 static void xs_local_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1989 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1992 if (RPC_IS_ASYNC(task
)) {
1994 * We want the AF_LOCAL connect to be resolved in the
1995 * filesystem namespace of the process making the rpc
1996 * call. Thus we connect synchronously.
1998 * If we want to support asynchronous AF_LOCAL calls,
1999 * we'll need to figure out how to pass a namespace to
2002 rpc_exit(task
, -ENOTCONN
);
2005 ret
= xs_local_setup_socket(transport
);
2006 if (ret
&& !RPC_IS_SOFTCONN(task
))
2007 msleep_interruptible(15000);
2010 #ifdef CONFIG_SUNRPC_SWAP
2011 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2013 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
2017 sk_set_memalloc(transport
->inet
);
2021 * xs_swapper - Tag this transport as being used for swap.
2022 * @xprt: transport to tag
2023 * @enable: enable/disable
2026 int xs_swapper(struct rpc_xprt
*xprt
, int enable
)
2028 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
2034 xs_set_memalloc(xprt
);
2035 } else if (xprt
->swapper
) {
2037 sk_clear_memalloc(transport
->inet
);
2042 EXPORT_SYMBOL_GPL(xs_swapper
);
2044 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2049 static void xs_udp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2051 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2053 if (!transport
->inet
) {
2054 struct sock
*sk
= sock
->sk
;
2056 write_lock_bh(&sk
->sk_callback_lock
);
2058 xs_save_old_callbacks(transport
, sk
);
2060 sk
->sk_user_data
= xprt
;
2061 sk
->sk_data_ready
= xs_udp_data_ready
;
2062 sk
->sk_write_space
= xs_udp_write_space
;
2063 sk
->sk_allocation
= GFP_ATOMIC
;
2065 xprt_set_connected(xprt
);
2067 /* Reset to new socket */
2068 transport
->sock
= sock
;
2069 transport
->inet
= sk
;
2071 xs_set_memalloc(xprt
);
2073 write_unlock_bh(&sk
->sk_callback_lock
);
2075 xs_udp_do_set_buffer_size(xprt
);
2078 static void xs_udp_setup_socket(struct work_struct
*work
)
2080 struct sock_xprt
*transport
=
2081 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2082 struct rpc_xprt
*xprt
= &transport
->xprt
;
2083 struct socket
*sock
= transport
->sock
;
2086 /* Start by resetting any existing state */
2087 xs_reset_transport(transport
);
2088 sock
= xs_create_sock(xprt
, transport
,
2089 xs_addr(xprt
)->sa_family
, SOCK_DGRAM
,
2090 IPPROTO_UDP
, false);
2094 dprintk("RPC: worker connecting xprt %p via %s to "
2095 "%s (port %s)\n", xprt
,
2096 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2097 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2098 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2100 xs_udp_finish_connecting(xprt
, sock
);
2101 trace_rpc_socket_connect(xprt
, sock
, 0);
2104 xprt_clear_connecting(xprt
);
2105 xprt_wake_pending_tasks(xprt
, status
);
2109 * We need to preserve the port number so the reply cache on the server can
2110 * find our cached RPC replies when we get around to reconnecting.
2112 static void xs_abort_connection(struct sock_xprt
*transport
)
2115 struct sockaddr any
;
2117 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport
);
2120 * Disconnect the transport socket by doing a connect operation
2121 * with AF_UNSPEC. This should return immediately...
2123 memset(&any
, 0, sizeof(any
));
2124 any
.sa_family
= AF_UNSPEC
;
2125 result
= kernel_connect(transport
->sock
, &any
, sizeof(any
), 0);
2126 trace_rpc_socket_reset_connection(&transport
->xprt
,
2127 transport
->sock
, result
);
2129 xs_sock_reset_connection_flags(&transport
->xprt
);
2130 dprintk("RPC: AF_UNSPEC connect return code %d\n", result
);
2133 static void xs_tcp_reuse_connection(struct sock_xprt
*transport
)
2135 unsigned int state
= transport
->inet
->sk_state
;
2137 if (state
== TCP_CLOSE
&& transport
->sock
->state
== SS_UNCONNECTED
) {
2138 /* we don't need to abort the connection if the socket
2139 * hasn't undergone a shutdown
2141 if (transport
->inet
->sk_shutdown
== 0)
2143 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2144 __func__
, transport
->inet
->sk_shutdown
);
2146 if ((1 << state
) & (TCPF_ESTABLISHED
|TCPF_SYN_SENT
)) {
2147 /* we don't need to abort the connection if the socket
2148 * hasn't undergone a shutdown
2150 if (transport
->inet
->sk_shutdown
== 0)
2152 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2153 "sk_shutdown set to %d\n",
2154 __func__
, transport
->inet
->sk_shutdown
);
2156 xs_abort_connection(transport
);
2159 static int xs_tcp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2161 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2162 int ret
= -ENOTCONN
;
2164 if (!transport
->inet
) {
2165 struct sock
*sk
= sock
->sk
;
2166 unsigned int keepidle
= xprt
->timeout
->to_initval
/ HZ
;
2167 unsigned int keepcnt
= xprt
->timeout
->to_retries
+ 1;
2168 unsigned int opt_on
= 1;
2170 /* TCP Keepalive options */
2171 kernel_setsockopt(sock
, SOL_SOCKET
, SO_KEEPALIVE
,
2172 (char *)&opt_on
, sizeof(opt_on
));
2173 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPIDLE
,
2174 (char *)&keepidle
, sizeof(keepidle
));
2175 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPINTVL
,
2176 (char *)&keepidle
, sizeof(keepidle
));
2177 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPCNT
,
2178 (char *)&keepcnt
, sizeof(keepcnt
));
2180 write_lock_bh(&sk
->sk_callback_lock
);
2182 xs_save_old_callbacks(transport
, sk
);
2184 sk
->sk_user_data
= xprt
;
2185 sk
->sk_data_ready
= xs_tcp_data_ready
;
2186 sk
->sk_state_change
= xs_tcp_state_change
;
2187 sk
->sk_write_space
= xs_tcp_write_space
;
2188 sk
->sk_error_report
= xs_error_report
;
2189 sk
->sk_allocation
= GFP_ATOMIC
;
2191 /* socket options */
2192 sock_reset_flag(sk
, SOCK_LINGER
);
2193 tcp_sk(sk
)->linger2
= 0;
2194 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
2196 xprt_clear_connected(xprt
);
2198 /* Reset to new socket */
2199 transport
->sock
= sock
;
2200 transport
->inet
= sk
;
2202 write_unlock_bh(&sk
->sk_callback_lock
);
2205 if (!xprt_bound(xprt
))
2208 xs_set_memalloc(xprt
);
2210 /* Tell the socket layer to start connecting... */
2211 xprt
->stat
.connect_count
++;
2212 xprt
->stat
.connect_start
= jiffies
;
2213 ret
= kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, O_NONBLOCK
);
2216 xs_set_srcport(transport
, sock
);
2219 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2220 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2227 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2228 * @xprt: RPC transport to connect
2229 * @transport: socket transport to connect
2230 * @create_sock: function to create a socket of the correct type
2232 * Invoked by a work queue tasklet.
2234 static void xs_tcp_setup_socket(struct work_struct
*work
)
2236 struct sock_xprt
*transport
=
2237 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2238 struct socket
*sock
= transport
->sock
;
2239 struct rpc_xprt
*xprt
= &transport
->xprt
;
2243 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
2244 sock
= xs_create_sock(xprt
, transport
,
2245 xs_addr(xprt
)->sa_family
, SOCK_STREAM
,
2248 status
= PTR_ERR(sock
);
2254 abort_and_exit
= test_and_clear_bit(XPRT_CONNECTION_ABORT
,
2256 /* "close" the socket, preserving the local port */
2257 set_bit(XPRT_CONNECTION_REUSE
, &xprt
->state
);
2258 xs_tcp_reuse_connection(transport
);
2259 clear_bit(XPRT_CONNECTION_REUSE
, &xprt
->state
);
2265 dprintk("RPC: worker connecting xprt %p via %s to "
2266 "%s (port %s)\n", xprt
,
2267 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2268 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2269 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2271 status
= xs_tcp_finish_connecting(xprt
, sock
);
2272 trace_rpc_socket_connect(xprt
, sock
, status
);
2273 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2274 xprt
, -status
, xprt_connected(xprt
),
2275 sock
->sk
->sk_state
);
2278 printk("%s: connect returned unhandled error %d\n",
2280 case -EADDRNOTAVAIL
:
2281 /* We're probably in TIME_WAIT. Get rid of existing socket,
2284 xs_tcp_force_close(xprt
);
2289 xprt_clear_connecting(xprt
);
2292 /* Happens, for instance, if the user specified a link
2293 * local IPv6 address without a scope-id.
2300 /* retry with existing socket, after a delay */
2306 xprt_clear_connecting(xprt
);
2307 xprt_wake_pending_tasks(xprt
, status
);
2311 * xs_connect - connect a socket to a remote endpoint
2312 * @xprt: pointer to transport structure
2313 * @task: address of RPC task that manages state of connect request
2315 * TCP: If the remote end dropped the connection, delay reconnecting.
2317 * UDP socket connects are synchronous, but we use a work queue anyway
2318 * to guarantee that even unprivileged user processes can set up a
2319 * socket on a privileged port.
2321 * If a UDP socket connect fails, the delay behavior here prevents
2322 * retry floods (hard mounts).
2324 static void xs_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
2326 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2328 if (transport
->sock
!= NULL
&& !RPC_IS_SOFTCONN(task
)) {
2329 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2331 xprt
, xprt
->reestablish_timeout
/ HZ
);
2332 queue_delayed_work(rpciod_workqueue
,
2333 &transport
->connect_worker
,
2334 xprt
->reestablish_timeout
);
2335 xprt
->reestablish_timeout
<<= 1;
2336 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2337 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2338 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
2339 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
2341 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
2342 queue_delayed_work(rpciod_workqueue
,
2343 &transport
->connect_worker
, 0);
2348 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2349 * @xprt: rpc_xprt struct containing statistics
2353 static void xs_local_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2357 if (xprt_connected(xprt
))
2358 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2360 seq_printf(seq
, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2361 "%llu %llu %lu %llu %llu\n",
2362 xprt
->stat
.bind_count
,
2363 xprt
->stat
.connect_count
,
2364 xprt
->stat
.connect_time
,
2368 xprt
->stat
.bad_xids
,
2371 xprt
->stat
.max_slots
,
2372 xprt
->stat
.sending_u
,
2373 xprt
->stat
.pending_u
);
2377 * xs_udp_print_stats - display UDP socket-specifc stats
2378 * @xprt: rpc_xprt struct containing statistics
2382 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2384 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2386 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2389 xprt
->stat
.bind_count
,
2392 xprt
->stat
.bad_xids
,
2395 xprt
->stat
.max_slots
,
2396 xprt
->stat
.sending_u
,
2397 xprt
->stat
.pending_u
);
2401 * xs_tcp_print_stats - display TCP socket-specifc stats
2402 * @xprt: rpc_xprt struct containing statistics
2406 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2408 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2411 if (xprt_connected(xprt
))
2412 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2414 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2415 "%llu %llu %lu %llu %llu\n",
2417 xprt
->stat
.bind_count
,
2418 xprt
->stat
.connect_count
,
2419 xprt
->stat
.connect_time
,
2423 xprt
->stat
.bad_xids
,
2426 xprt
->stat
.max_slots
,
2427 xprt
->stat
.sending_u
,
2428 xprt
->stat
.pending_u
);
2432 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2433 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2434 * to use the server side send routines.
2436 static void *bc_malloc(struct rpc_task
*task
, size_t size
)
2439 struct rpc_buffer
*buf
;
2441 WARN_ON_ONCE(size
> PAGE_SIZE
- sizeof(struct rpc_buffer
));
2442 if (size
> PAGE_SIZE
- sizeof(struct rpc_buffer
))
2445 page
= alloc_page(GFP_KERNEL
);
2449 buf
= page_address(page
);
2450 buf
->len
= PAGE_SIZE
;
2456 * Free the space allocated in the bc_alloc routine
2458 static void bc_free(void *buffer
)
2460 struct rpc_buffer
*buf
;
2465 buf
= container_of(buffer
, struct rpc_buffer
, data
);
2466 free_page((unsigned long)buf
);
2470 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2471 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2473 static int bc_sendto(struct rpc_rqst
*req
)
2476 struct xdr_buf
*xbufp
= &req
->rq_snd_buf
;
2477 struct rpc_xprt
*xprt
= req
->rq_xprt
;
2478 struct sock_xprt
*transport
=
2479 container_of(xprt
, struct sock_xprt
, xprt
);
2480 struct socket
*sock
= transport
->sock
;
2481 unsigned long headoff
;
2482 unsigned long tailoff
;
2484 xs_encode_stream_record_marker(xbufp
);
2486 tailoff
= (unsigned long)xbufp
->tail
[0].iov_base
& ~PAGE_MASK
;
2487 headoff
= (unsigned long)xbufp
->head
[0].iov_base
& ~PAGE_MASK
;
2488 len
= svc_send_common(sock
, xbufp
,
2489 virt_to_page(xbufp
->head
[0].iov_base
), headoff
,
2490 xbufp
->tail
[0].iov_base
, tailoff
);
2492 if (len
!= xbufp
->len
) {
2493 printk(KERN_NOTICE
"Error sending entire callback!\n");
2501 * The send routine. Borrows from svc_send
2503 static int bc_send_request(struct rpc_task
*task
)
2505 struct rpc_rqst
*req
= task
->tk_rqstp
;
2506 struct svc_xprt
*xprt
;
2509 dprintk("sending request with xid: %08x\n", ntohl(req
->rq_xid
));
2511 * Get the server socket associated with this callback xprt
2513 xprt
= req
->rq_xprt
->bc_xprt
;
2516 * Grab the mutex to serialize data as the connection is shared
2517 * with the fore channel
2519 if (!mutex_trylock(&xprt
->xpt_mutex
)) {
2520 rpc_sleep_on(&xprt
->xpt_bc_pending
, task
, NULL
);
2521 if (!mutex_trylock(&xprt
->xpt_mutex
))
2523 rpc_wake_up_queued_task(&xprt
->xpt_bc_pending
, task
);
2525 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
))
2528 len
= bc_sendto(req
);
2529 mutex_unlock(&xprt
->xpt_mutex
);
2538 * The close routine. Since this is client initiated, we do nothing
2541 static void bc_close(struct rpc_xprt
*xprt
)
2546 * The xprt destroy routine. Again, because this connection is client
2547 * initiated, we do nothing
2550 static void bc_destroy(struct rpc_xprt
*xprt
)
2552 dprintk("RPC: bc_destroy xprt %p\n", xprt
);
2555 module_put(THIS_MODULE
);
2558 static struct rpc_xprt_ops xs_local_ops
= {
2559 .reserve_xprt
= xprt_reserve_xprt
,
2560 .release_xprt
= xs_tcp_release_xprt
,
2561 .alloc_slot
= xprt_alloc_slot
,
2562 .rpcbind
= xs_local_rpcbind
,
2563 .set_port
= xs_local_set_port
,
2564 .connect
= xs_local_connect
,
2565 .buf_alloc
= rpc_malloc
,
2566 .buf_free
= rpc_free
,
2567 .send_request
= xs_local_send_request
,
2568 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2570 .destroy
= xs_destroy
,
2571 .print_stats
= xs_local_print_stats
,
2574 static struct rpc_xprt_ops xs_udp_ops
= {
2575 .set_buffer_size
= xs_udp_set_buffer_size
,
2576 .reserve_xprt
= xprt_reserve_xprt_cong
,
2577 .release_xprt
= xprt_release_xprt_cong
,
2578 .alloc_slot
= xprt_alloc_slot
,
2579 .rpcbind
= rpcb_getport_async
,
2580 .set_port
= xs_set_port
,
2581 .connect
= xs_connect
,
2582 .buf_alloc
= rpc_malloc
,
2583 .buf_free
= rpc_free
,
2584 .send_request
= xs_udp_send_request
,
2585 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
2586 .timer
= xs_udp_timer
,
2587 .release_request
= xprt_release_rqst_cong
,
2589 .destroy
= xs_destroy
,
2590 .print_stats
= xs_udp_print_stats
,
2593 static struct rpc_xprt_ops xs_tcp_ops
= {
2594 .reserve_xprt
= xprt_reserve_xprt
,
2595 .release_xprt
= xs_tcp_release_xprt
,
2596 .alloc_slot
= xprt_lock_and_alloc_slot
,
2597 .rpcbind
= rpcb_getport_async
,
2598 .set_port
= xs_set_port
,
2599 .connect
= xs_connect
,
2600 .buf_alloc
= rpc_malloc
,
2601 .buf_free
= rpc_free
,
2602 .send_request
= xs_tcp_send_request
,
2603 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2604 .close
= xs_tcp_close
,
2605 .destroy
= xs_destroy
,
2606 .print_stats
= xs_tcp_print_stats
,
2610 * The rpc_xprt_ops for the server backchannel
2613 static struct rpc_xprt_ops bc_tcp_ops
= {
2614 .reserve_xprt
= xprt_reserve_xprt
,
2615 .release_xprt
= xprt_release_xprt
,
2616 .alloc_slot
= xprt_alloc_slot
,
2617 .buf_alloc
= bc_malloc
,
2618 .buf_free
= bc_free
,
2619 .send_request
= bc_send_request
,
2620 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2622 .destroy
= bc_destroy
,
2623 .print_stats
= xs_tcp_print_stats
,
2626 static int xs_init_anyaddr(const int family
, struct sockaddr
*sap
)
2628 static const struct sockaddr_in sin
= {
2629 .sin_family
= AF_INET
,
2630 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
2632 static const struct sockaddr_in6 sin6
= {
2633 .sin6_family
= AF_INET6
,
2634 .sin6_addr
= IN6ADDR_ANY_INIT
,
2641 memcpy(sap
, &sin
, sizeof(sin
));
2644 memcpy(sap
, &sin6
, sizeof(sin6
));
2647 dprintk("RPC: %s: Bad address family\n", __func__
);
2648 return -EAFNOSUPPORT
;
2653 static struct rpc_xprt
*xs_setup_xprt(struct xprt_create
*args
,
2654 unsigned int slot_table_size
,
2655 unsigned int max_slot_table_size
)
2657 struct rpc_xprt
*xprt
;
2658 struct sock_xprt
*new;
2660 if (args
->addrlen
> sizeof(xprt
->addr
)) {
2661 dprintk("RPC: xs_setup_xprt: address too large\n");
2662 return ERR_PTR(-EBADF
);
2665 xprt
= xprt_alloc(args
->net
, sizeof(*new), slot_table_size
,
2666 max_slot_table_size
);
2668 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2670 return ERR_PTR(-ENOMEM
);
2673 new = container_of(xprt
, struct sock_xprt
, xprt
);
2674 memcpy(&xprt
->addr
, args
->dstaddr
, args
->addrlen
);
2675 xprt
->addrlen
= args
->addrlen
;
2677 memcpy(&new->srcaddr
, args
->srcaddr
, args
->addrlen
);
2680 err
= xs_init_anyaddr(args
->dstaddr
->sa_family
,
2681 (struct sockaddr
*)&new->srcaddr
);
2684 return ERR_PTR(err
);
2691 static const struct rpc_timeout xs_local_default_timeout
= {
2692 .to_initval
= 10 * HZ
,
2693 .to_maxval
= 10 * HZ
,
2698 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2699 * @args: rpc transport creation arguments
2701 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2703 static struct rpc_xprt
*xs_setup_local(struct xprt_create
*args
)
2705 struct sockaddr_un
*sun
= (struct sockaddr_un
*)args
->dstaddr
;
2706 struct sock_xprt
*transport
;
2707 struct rpc_xprt
*xprt
;
2708 struct rpc_xprt
*ret
;
2710 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2711 xprt_max_tcp_slot_table_entries
);
2714 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2717 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2718 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2720 xprt
->bind_timeout
= XS_BIND_TO
;
2721 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2722 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2724 xprt
->ops
= &xs_local_ops
;
2725 xprt
->timeout
= &xs_local_default_timeout
;
2727 INIT_DELAYED_WORK(&transport
->connect_worker
,
2728 xs_dummy_setup_socket
);
2730 switch (sun
->sun_family
) {
2732 if (sun
->sun_path
[0] != '/') {
2733 dprintk("RPC: bad AF_LOCAL address: %s\n",
2735 ret
= ERR_PTR(-EINVAL
);
2738 xprt_set_bound(xprt
);
2739 xs_format_peer_addresses(xprt
, "local", RPCBIND_NETID_LOCAL
);
2740 ret
= ERR_PTR(xs_local_setup_socket(transport
));
2745 ret
= ERR_PTR(-EAFNOSUPPORT
);
2749 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2750 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2752 if (try_module_get(THIS_MODULE
))
2754 ret
= ERR_PTR(-EINVAL
);
2760 static const struct rpc_timeout xs_udp_default_timeout
= {
2761 .to_initval
= 5 * HZ
,
2762 .to_maxval
= 30 * HZ
,
2763 .to_increment
= 5 * HZ
,
2768 * xs_setup_udp - Set up transport to use a UDP socket
2769 * @args: rpc transport creation arguments
2772 static struct rpc_xprt
*xs_setup_udp(struct xprt_create
*args
)
2774 struct sockaddr
*addr
= args
->dstaddr
;
2775 struct rpc_xprt
*xprt
;
2776 struct sock_xprt
*transport
;
2777 struct rpc_xprt
*ret
;
2779 xprt
= xs_setup_xprt(args
, xprt_udp_slot_table_entries
,
2780 xprt_udp_slot_table_entries
);
2783 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2785 xprt
->prot
= IPPROTO_UDP
;
2787 /* XXX: header size can vary due to auth type, IPv6, etc. */
2788 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
2790 xprt
->bind_timeout
= XS_BIND_TO
;
2791 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
2792 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2794 xprt
->ops
= &xs_udp_ops
;
2796 xprt
->timeout
= &xs_udp_default_timeout
;
2798 switch (addr
->sa_family
) {
2800 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2801 xprt_set_bound(xprt
);
2803 INIT_DELAYED_WORK(&transport
->connect_worker
,
2804 xs_udp_setup_socket
);
2805 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP
);
2808 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2809 xprt_set_bound(xprt
);
2811 INIT_DELAYED_WORK(&transport
->connect_worker
,
2812 xs_udp_setup_socket
);
2813 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP6
);
2816 ret
= ERR_PTR(-EAFNOSUPPORT
);
2820 if (xprt_bound(xprt
))
2821 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2822 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2823 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2824 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2826 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2827 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2828 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2830 if (try_module_get(THIS_MODULE
))
2832 ret
= ERR_PTR(-EINVAL
);
2838 static const struct rpc_timeout xs_tcp_default_timeout
= {
2839 .to_initval
= 60 * HZ
,
2840 .to_maxval
= 60 * HZ
,
2845 * xs_setup_tcp - Set up transport to use a TCP socket
2846 * @args: rpc transport creation arguments
2849 static struct rpc_xprt
*xs_setup_tcp(struct xprt_create
*args
)
2851 struct sockaddr
*addr
= args
->dstaddr
;
2852 struct rpc_xprt
*xprt
;
2853 struct sock_xprt
*transport
;
2854 struct rpc_xprt
*ret
;
2855 unsigned int max_slot_table_size
= xprt_max_tcp_slot_table_entries
;
2857 if (args
->flags
& XPRT_CREATE_INFINITE_SLOTS
)
2858 max_slot_table_size
= RPC_MAX_SLOT_TABLE_LIMIT
;
2860 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2861 max_slot_table_size
);
2864 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2866 xprt
->prot
= IPPROTO_TCP
;
2867 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2868 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2870 xprt
->bind_timeout
= XS_BIND_TO
;
2871 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2872 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2874 xprt
->ops
= &xs_tcp_ops
;
2875 xprt
->timeout
= &xs_tcp_default_timeout
;
2877 switch (addr
->sa_family
) {
2879 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2880 xprt_set_bound(xprt
);
2882 INIT_DELAYED_WORK(&transport
->connect_worker
,
2883 xs_tcp_setup_socket
);
2884 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP
);
2887 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2888 xprt_set_bound(xprt
);
2890 INIT_DELAYED_WORK(&transport
->connect_worker
,
2891 xs_tcp_setup_socket
);
2892 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP6
);
2895 ret
= ERR_PTR(-EAFNOSUPPORT
);
2899 if (xprt_bound(xprt
))
2900 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2901 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2902 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2903 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2905 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2906 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2907 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2909 if (try_module_get(THIS_MODULE
))
2911 ret
= ERR_PTR(-EINVAL
);
2918 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2919 * @args: rpc transport creation arguments
2922 static struct rpc_xprt
*xs_setup_bc_tcp(struct xprt_create
*args
)
2924 struct sockaddr
*addr
= args
->dstaddr
;
2925 struct rpc_xprt
*xprt
;
2926 struct sock_xprt
*transport
;
2927 struct svc_sock
*bc_sock
;
2928 struct rpc_xprt
*ret
;
2930 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2931 xprt_tcp_slot_table_entries
);
2934 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2936 xprt
->prot
= IPPROTO_TCP
;
2937 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2938 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2939 xprt
->timeout
= &xs_tcp_default_timeout
;
2942 xprt_set_bound(xprt
);
2943 xprt
->bind_timeout
= 0;
2944 xprt
->reestablish_timeout
= 0;
2945 xprt
->idle_timeout
= 0;
2947 xprt
->ops
= &bc_tcp_ops
;
2949 switch (addr
->sa_family
) {
2951 xs_format_peer_addresses(xprt
, "tcp",
2955 xs_format_peer_addresses(xprt
, "tcp",
2956 RPCBIND_NETID_TCP6
);
2959 ret
= ERR_PTR(-EAFNOSUPPORT
);
2963 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2964 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2965 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2966 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2969 * Once we've associated a backchannel xprt with a connection,
2970 * we want to keep it around as long as the connection lasts,
2971 * in case we need to start using it for a backchannel again;
2972 * this reference won't be dropped until bc_xprt is destroyed.
2975 args
->bc_xprt
->xpt_bc_xprt
= xprt
;
2976 xprt
->bc_xprt
= args
->bc_xprt
;
2977 bc_sock
= container_of(args
->bc_xprt
, struct svc_sock
, sk_xprt
);
2978 transport
->sock
= bc_sock
->sk_sock
;
2979 transport
->inet
= bc_sock
->sk_sk
;
2982 * Since we don't want connections for the backchannel, we set
2983 * the xprt status to connected
2985 xprt_set_connected(xprt
);
2987 if (try_module_get(THIS_MODULE
))
2990 args
->bc_xprt
->xpt_bc_xprt
= NULL
;
2992 ret
= ERR_PTR(-EINVAL
);
2998 static struct xprt_class xs_local_transport
= {
2999 .list
= LIST_HEAD_INIT(xs_local_transport
.list
),
3000 .name
= "named UNIX socket",
3001 .owner
= THIS_MODULE
,
3002 .ident
= XPRT_TRANSPORT_LOCAL
,
3003 .setup
= xs_setup_local
,
3006 static struct xprt_class xs_udp_transport
= {
3007 .list
= LIST_HEAD_INIT(xs_udp_transport
.list
),
3009 .owner
= THIS_MODULE
,
3010 .ident
= XPRT_TRANSPORT_UDP
,
3011 .setup
= xs_setup_udp
,
3014 static struct xprt_class xs_tcp_transport
= {
3015 .list
= LIST_HEAD_INIT(xs_tcp_transport
.list
),
3017 .owner
= THIS_MODULE
,
3018 .ident
= XPRT_TRANSPORT_TCP
,
3019 .setup
= xs_setup_tcp
,
3022 static struct xprt_class xs_bc_tcp_transport
= {
3023 .list
= LIST_HEAD_INIT(xs_bc_tcp_transport
.list
),
3024 .name
= "tcp NFSv4.1 backchannel",
3025 .owner
= THIS_MODULE
,
3026 .ident
= XPRT_TRANSPORT_BC_TCP
,
3027 .setup
= xs_setup_bc_tcp
,
3031 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3034 int init_socket_xprt(void)
3036 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3037 if (!sunrpc_table_header
)
3038 sunrpc_table_header
= register_sysctl_table(sunrpc_table
);
3041 xprt_register_transport(&xs_local_transport
);
3042 xprt_register_transport(&xs_udp_transport
);
3043 xprt_register_transport(&xs_tcp_transport
);
3044 xprt_register_transport(&xs_bc_tcp_transport
);
3050 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3053 void cleanup_socket_xprt(void)
3055 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3056 if (sunrpc_table_header
) {
3057 unregister_sysctl_table(sunrpc_table_header
);
3058 sunrpc_table_header
= NULL
;
3062 xprt_unregister_transport(&xs_local_transport
);
3063 xprt_unregister_transport(&xs_udp_transport
);
3064 xprt_unregister_transport(&xs_tcp_transport
);
3065 xprt_unregister_transport(&xs_bc_tcp_transport
);
3068 static int param_set_uint_minmax(const char *val
,
3069 const struct kernel_param
*kp
,
3070 unsigned int min
, unsigned int max
)
3077 ret
= kstrtouint(val
, 0, &num
);
3078 if (ret
== -EINVAL
|| num
< min
|| num
> max
)
3080 *((unsigned int *)kp
->arg
) = num
;
3084 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
3086 return param_set_uint_minmax(val
, kp
,
3091 static struct kernel_param_ops param_ops_portnr
= {
3092 .set
= param_set_portnr
,
3093 .get
= param_get_uint
,
3096 #define param_check_portnr(name, p) \
3097 __param_check(name, p, unsigned int);
3099 module_param_named(min_resvport
, xprt_min_resvport
, portnr
, 0644);
3100 module_param_named(max_resvport
, xprt_max_resvport
, portnr
, 0644);
3102 static int param_set_slot_table_size(const char *val
,
3103 const struct kernel_param
*kp
)
3105 return param_set_uint_minmax(val
, kp
,
3107 RPC_MAX_SLOT_TABLE
);
3110 static struct kernel_param_ops param_ops_slot_table_size
= {
3111 .set
= param_set_slot_table_size
,
3112 .get
= param_get_uint
,
3115 #define param_check_slot_table_size(name, p) \
3116 __param_check(name, p, unsigned int);
3118 static int param_set_max_slot_table_size(const char *val
,
3119 const struct kernel_param
*kp
)
3121 return param_set_uint_minmax(val
, kp
,
3123 RPC_MAX_SLOT_TABLE_LIMIT
);
3126 static struct kernel_param_ops param_ops_max_slot_table_size
= {
3127 .set
= param_set_max_slot_table_size
,
3128 .get
= param_get_uint
,
3131 #define param_check_max_slot_table_size(name, p) \
3132 __param_check(name, p, unsigned int);
3134 module_param_named(tcp_slot_table_entries
, xprt_tcp_slot_table_entries
,
3135 slot_table_size
, 0644);
3136 module_param_named(tcp_max_slot_table_entries
, xprt_max_tcp_slot_table_entries
,
3137 max_slot_table_size
, 0644);
3138 module_param_named(udp_slot_table_entries
, xprt_udp_slot_table_entries
,
3139 slot_table_size
, 0644);