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 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
68 #define XS_TCP_LINGER_TO (15U * HZ)
69 static unsigned int xs_tcp_fin_timeout __read_mostly
= XS_TCP_LINGER_TO
;
72 * We can register our own files under /proc/sys/sunrpc by
73 * calling register_sysctl_table() again. The files in that
74 * directory become the union of all files registered there.
76 * We simply need to make sure that we don't collide with
77 * someone else's file names!
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
);
531 if (status
== -EAGAIN
&& sock_writeable(transport
->inet
))
534 if (likely(sent
> 0) || status
== 0) {
535 req
->rq_bytes_sent
+= sent
;
536 req
->rq_xmit_bytes_sent
+= sent
;
537 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
538 req
->rq_bytes_sent
= 0;
548 status
= xs_nospace(task
);
551 dprintk("RPC: sendmsg returned unrecognized error %d\n",
562 * xs_udp_send_request - write an RPC request to a UDP socket
563 * @task: address of RPC task that manages the state of an RPC request
566 * 0: The request has been sent
567 * EAGAIN: The socket was blocked, please call again later to
568 * complete the request
569 * ENOTCONN: Caller needs to invoke connect logic then call again
570 * other: Some other error occurred, the request was not sent
572 static int xs_udp_send_request(struct rpc_task
*task
)
574 struct rpc_rqst
*req
= task
->tk_rqstp
;
575 struct rpc_xprt
*xprt
= req
->rq_xprt
;
576 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
577 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
581 xs_pktdump("packet data:",
582 req
->rq_svec
->iov_base
,
583 req
->rq_svec
->iov_len
);
585 if (!xprt_bound(xprt
))
587 status
= xs_sendpages(transport
->sock
, xs_addr(xprt
), xprt
->addrlen
,
588 xdr
, req
->rq_bytes_sent
, true, &sent
);
590 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
591 xdr
->len
- req
->rq_bytes_sent
, status
);
593 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
594 if (status
== -EPERM
)
597 if (status
== -EAGAIN
&& sock_writeable(transport
->inet
))
600 if (sent
> 0 || status
== 0) {
601 req
->rq_xmit_bytes_sent
+= sent
;
602 if (sent
>= req
->rq_slen
)
604 /* Still some bytes left; set up for a retry later. */
612 /* Should we call xs_close() here? */
615 status
= xs_nospace(task
);
618 dprintk("RPC: sendmsg returned unrecognized error %d\n",
625 /* When the server has died, an ICMP port unreachable message
626 * prompts ECONNREFUSED. */
627 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
634 * xs_tcp_send_request - write an RPC request to a TCP socket
635 * @task: address of RPC task that manages the state of an RPC request
638 * 0: The request has been sent
639 * EAGAIN: The socket was blocked, please call again later to
640 * complete the request
641 * ENOTCONN: Caller needs to invoke connect logic then call again
642 * other: Some other error occurred, the request was not sent
644 * XXX: In the case of soft timeouts, should we eventually give up
645 * if sendmsg is not able to make progress?
647 static int xs_tcp_send_request(struct rpc_task
*task
)
649 struct rpc_rqst
*req
= task
->tk_rqstp
;
650 struct rpc_xprt
*xprt
= req
->rq_xprt
;
651 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
652 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
653 bool zerocopy
= true;
657 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
659 xs_pktdump("packet data:",
660 req
->rq_svec
->iov_base
,
661 req
->rq_svec
->iov_len
);
662 /* Don't use zero copy if this is a resend. If the RPC call
663 * completes while the socket holds a reference to the pages,
664 * then we may end up resending corrupted data.
666 if (task
->tk_flags
& RPC_TASK_SENT
)
669 /* Continue transmitting the packet/record. We must be careful
670 * to cope with writespace callbacks arriving _after_ we have
671 * called sendmsg(). */
674 status
= xs_sendpages(transport
->sock
, NULL
, 0, xdr
,
675 req
->rq_bytes_sent
, zerocopy
, &sent
);
677 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
678 xdr
->len
- req
->rq_bytes_sent
, status
);
680 /* If we've sent the entire packet, immediately
681 * reset the count of bytes sent. */
682 req
->rq_bytes_sent
+= sent
;
683 req
->rq_xmit_bytes_sent
+= sent
;
684 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
685 req
->rq_bytes_sent
= 0;
696 if (status
== -EAGAIN
&& sk_stream_is_writeable(transport
->inet
))
702 /* Should we call xs_close() here? */
705 status
= xs_nospace(task
);
708 dprintk("RPC: sendmsg returned unrecognized error %d\n",
716 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
723 * xs_tcp_release_xprt - clean up after a tcp transmission
727 * This cleans up if an error causes us to abort the transmission of a request.
728 * In this case, the socket may need to be reset in order to avoid confusing
731 static void xs_tcp_release_xprt(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
733 struct rpc_rqst
*req
;
735 if (task
!= xprt
->snd_task
)
739 req
= task
->tk_rqstp
;
742 if (req
->rq_bytes_sent
== 0)
744 if (req
->rq_bytes_sent
== req
->rq_snd_buf
.len
)
746 set_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
748 xprt_release_xprt(xprt
, task
);
751 static void xs_save_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
753 transport
->old_data_ready
= sk
->sk_data_ready
;
754 transport
->old_state_change
= sk
->sk_state_change
;
755 transport
->old_write_space
= sk
->sk_write_space
;
756 transport
->old_error_report
= sk
->sk_error_report
;
759 static void xs_restore_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
761 sk
->sk_data_ready
= transport
->old_data_ready
;
762 sk
->sk_state_change
= transport
->old_state_change
;
763 sk
->sk_write_space
= transport
->old_write_space
;
764 sk
->sk_error_report
= transport
->old_error_report
;
767 static void xs_sock_reset_connection_flags(struct rpc_xprt
*xprt
)
769 smp_mb__before_atomic();
770 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
771 clear_bit(XPRT_CLOSING
, &xprt
->state
);
772 smp_mb__after_atomic();
775 static void xs_sock_mark_closed(struct rpc_xprt
*xprt
)
777 xs_sock_reset_connection_flags(xprt
);
778 /* Mark transport as closed and wake up all pending tasks */
779 xprt_disconnect_done(xprt
);
783 * xs_error_report - callback to handle TCP socket state errors
786 * Note: we don't call sock_error() since there may be a rpc_task
787 * using the socket, and so we don't want to clear sk->sk_err.
789 static void xs_error_report(struct sock
*sk
)
791 struct rpc_xprt
*xprt
;
794 read_lock_bh(&sk
->sk_callback_lock
);
795 if (!(xprt
= xprt_from_sock(sk
)))
801 /* Is this a reset event? */
802 if (sk
->sk_state
== TCP_CLOSE
)
803 xs_sock_mark_closed(xprt
);
804 dprintk("RPC: xs_error_report client %p, error=%d...\n",
806 trace_rpc_socket_error(xprt
, sk
->sk_socket
, err
);
807 xprt_wake_pending_tasks(xprt
, err
);
809 read_unlock_bh(&sk
->sk_callback_lock
);
812 static void xs_reset_transport(struct sock_xprt
*transport
)
814 struct socket
*sock
= transport
->sock
;
815 struct sock
*sk
= transport
->inet
;
816 struct rpc_xprt
*xprt
= &transport
->xprt
;
821 if (atomic_read(&transport
->xprt
.swapper
))
822 sk_clear_memalloc(sk
);
824 kernel_sock_shutdown(sock
, SHUT_RDWR
);
826 write_lock_bh(&sk
->sk_callback_lock
);
827 transport
->inet
= NULL
;
828 transport
->sock
= NULL
;
830 sk
->sk_user_data
= NULL
;
832 xs_restore_old_callbacks(transport
, sk
);
833 xprt_clear_connected(xprt
);
834 write_unlock_bh(&sk
->sk_callback_lock
);
835 xs_sock_reset_connection_flags(xprt
);
837 trace_rpc_socket_close(xprt
, sock
);
842 * xs_close - close a socket
845 * This is used when all requests are complete; ie, no DRC state remains
846 * on the server we want to save.
848 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
849 * xs_reset_transport() zeroing the socket from underneath a writer.
851 static void xs_close(struct rpc_xprt
*xprt
)
853 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
855 dprintk("RPC: xs_close xprt %p\n", xprt
);
857 xs_reset_transport(transport
);
858 xprt
->reestablish_timeout
= 0;
860 xprt_disconnect_done(xprt
);
863 static void xs_inject_disconnect(struct rpc_xprt
*xprt
)
865 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
867 xprt_disconnect_done(xprt
);
870 static void xs_xprt_free(struct rpc_xprt
*xprt
)
872 xs_free_peer_addresses(xprt
);
877 * xs_destroy - prepare to shutdown a transport
878 * @xprt: doomed transport
881 static void xs_destroy(struct rpc_xprt
*xprt
)
883 struct sock_xprt
*transport
= container_of(xprt
,
884 struct sock_xprt
, xprt
);
885 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
887 cancel_delayed_work_sync(&transport
->connect_worker
);
890 module_put(THIS_MODULE
);
893 static int xs_local_copy_to_xdr(struct xdr_buf
*xdr
, struct sk_buff
*skb
)
895 struct xdr_skb_reader desc
= {
897 .offset
= sizeof(rpc_fraghdr
),
898 .count
= skb
->len
- sizeof(rpc_fraghdr
),
901 if (xdr_partial_copy_from_skb(xdr
, 0, &desc
, xdr_skb_read_bits
) < 0)
909 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
910 * @sk: socket with data to read
912 * Currently this assumes we can read the whole reply in a single gulp.
914 static void xs_local_data_ready(struct sock
*sk
)
916 struct rpc_task
*task
;
917 struct rpc_xprt
*xprt
;
918 struct rpc_rqst
*rovr
;
920 int err
, repsize
, copied
;
924 read_lock_bh(&sk
->sk_callback_lock
);
925 dprintk("RPC: %s...\n", __func__
);
926 xprt
= xprt_from_sock(sk
);
930 skb
= skb_recv_datagram(sk
, 0, 1, &err
);
934 repsize
= skb
->len
- sizeof(rpc_fraghdr
);
936 dprintk("RPC: impossible RPC reply size %d\n", repsize
);
940 /* Copy the XID from the skb... */
941 xp
= skb_header_pointer(skb
, sizeof(rpc_fraghdr
), sizeof(_xid
), &_xid
);
945 /* Look up and lock the request corresponding to the given XID */
946 spin_lock(&xprt
->transport_lock
);
947 rovr
= xprt_lookup_rqst(xprt
, *xp
);
950 task
= rovr
->rq_task
;
952 copied
= rovr
->rq_private_buf
.buflen
;
953 if (copied
> repsize
)
956 if (xs_local_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
957 dprintk("RPC: sk_buff copy failed\n");
961 xprt_complete_rqst(task
, copied
);
964 spin_unlock(&xprt
->transport_lock
);
966 skb_free_datagram(sk
, skb
);
968 read_unlock_bh(&sk
->sk_callback_lock
);
972 * xs_udp_data_ready - "data ready" callback for UDP sockets
973 * @sk: socket with 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 xprt_force_disconnect(xprt
);
1044 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
1046 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1050 p
= ((char *) &transport
->tcp_fraghdr
) + transport
->tcp_offset
;
1051 len
= sizeof(transport
->tcp_fraghdr
) - transport
->tcp_offset
;
1052 used
= xdr_skb_read_bits(desc
, p
, len
);
1053 transport
->tcp_offset
+= used
;
1057 transport
->tcp_reclen
= ntohl(transport
->tcp_fraghdr
);
1058 if (transport
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
1059 transport
->tcp_flags
|= TCP_RCV_LAST_FRAG
;
1061 transport
->tcp_flags
&= ~TCP_RCV_LAST_FRAG
;
1062 transport
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
1064 transport
->tcp_flags
&= ~TCP_RCV_COPY_FRAGHDR
;
1065 transport
->tcp_offset
= 0;
1067 /* Sanity check of the record length */
1068 if (unlikely(transport
->tcp_reclen
< 8)) {
1069 dprintk("RPC: invalid TCP record fragment length\n");
1070 xs_tcp_force_close(xprt
);
1073 dprintk("RPC: reading TCP record fragment of length %d\n",
1074 transport
->tcp_reclen
);
1077 static void xs_tcp_check_fraghdr(struct sock_xprt
*transport
)
1079 if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1080 transport
->tcp_flags
|= TCP_RCV_COPY_FRAGHDR
;
1081 transport
->tcp_offset
= 0;
1082 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
) {
1083 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1084 transport
->tcp_flags
|= TCP_RCV_COPY_XID
;
1085 transport
->tcp_copied
= 0;
1090 static inline void xs_tcp_read_xid(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1095 len
= sizeof(transport
->tcp_xid
) - transport
->tcp_offset
;
1096 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
1097 p
= ((char *) &transport
->tcp_xid
) + transport
->tcp_offset
;
1098 used
= xdr_skb_read_bits(desc
, p
, len
);
1099 transport
->tcp_offset
+= used
;
1102 transport
->tcp_flags
&= ~TCP_RCV_COPY_XID
;
1103 transport
->tcp_flags
|= TCP_RCV_READ_CALLDIR
;
1104 transport
->tcp_copied
= 4;
1105 dprintk("RPC: reading %s XID %08x\n",
1106 (transport
->tcp_flags
& TCP_RPC_REPLY
) ? "reply for"
1108 ntohl(transport
->tcp_xid
));
1109 xs_tcp_check_fraghdr(transport
);
1112 static inline void xs_tcp_read_calldir(struct sock_xprt
*transport
,
1113 struct xdr_skb_reader
*desc
)
1120 * We want transport->tcp_offset to be 8 at the end of this routine
1121 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1122 * When this function is called for the first time,
1123 * transport->tcp_offset is 4 (after having already read the xid).
1125 offset
= transport
->tcp_offset
- sizeof(transport
->tcp_xid
);
1126 len
= sizeof(transport
->tcp_calldir
) - offset
;
1127 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len
);
1128 p
= ((char *) &transport
->tcp_calldir
) + offset
;
1129 used
= xdr_skb_read_bits(desc
, p
, len
);
1130 transport
->tcp_offset
+= used
;
1133 transport
->tcp_flags
&= ~TCP_RCV_READ_CALLDIR
;
1135 * We don't yet have the XDR buffer, so we will write the calldir
1136 * out after we get the buffer from the 'struct rpc_rqst'
1138 switch (ntohl(transport
->tcp_calldir
)) {
1140 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1141 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1142 transport
->tcp_flags
|= TCP_RPC_REPLY
;
1145 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1146 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1147 transport
->tcp_flags
&= ~TCP_RPC_REPLY
;
1150 dprintk("RPC: invalid request message type\n");
1151 xs_tcp_force_close(&transport
->xprt
);
1153 xs_tcp_check_fraghdr(transport
);
1156 static inline void xs_tcp_read_common(struct rpc_xprt
*xprt
,
1157 struct xdr_skb_reader
*desc
,
1158 struct rpc_rqst
*req
)
1160 struct sock_xprt
*transport
=
1161 container_of(xprt
, struct sock_xprt
, xprt
);
1162 struct xdr_buf
*rcvbuf
;
1166 rcvbuf
= &req
->rq_private_buf
;
1168 if (transport
->tcp_flags
& TCP_RCV_COPY_CALLDIR
) {
1170 * Save the RPC direction in the XDR buffer
1172 memcpy(rcvbuf
->head
[0].iov_base
+ transport
->tcp_copied
,
1173 &transport
->tcp_calldir
,
1174 sizeof(transport
->tcp_calldir
));
1175 transport
->tcp_copied
+= sizeof(transport
->tcp_calldir
);
1176 transport
->tcp_flags
&= ~TCP_RCV_COPY_CALLDIR
;
1180 if (len
> transport
->tcp_reclen
- transport
->tcp_offset
) {
1181 struct xdr_skb_reader my_desc
;
1183 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1184 memcpy(&my_desc
, desc
, sizeof(my_desc
));
1185 my_desc
.count
= len
;
1186 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1187 &my_desc
, xdr_skb_read_bits
);
1191 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1192 desc
, xdr_skb_read_bits
);
1195 transport
->tcp_copied
+= r
;
1196 transport
->tcp_offset
+= r
;
1199 /* Error when copying to the receive buffer,
1200 * usually because we weren't able to allocate
1201 * additional buffer pages. All we can do now
1202 * is turn off TCP_RCV_COPY_DATA, so the request
1203 * will not receive any additional updates,
1205 * Any remaining data from this record will
1208 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1209 dprintk("RPC: XID %08x truncated request\n",
1210 ntohl(transport
->tcp_xid
));
1211 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1212 "tcp_offset = %u, tcp_reclen = %u\n",
1213 xprt
, transport
->tcp_copied
,
1214 transport
->tcp_offset
, transport
->tcp_reclen
);
1218 dprintk("RPC: XID %08x read %Zd bytes\n",
1219 ntohl(transport
->tcp_xid
), r
);
1220 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1221 "tcp_reclen = %u\n", xprt
, transport
->tcp_copied
,
1222 transport
->tcp_offset
, transport
->tcp_reclen
);
1224 if (transport
->tcp_copied
== req
->rq_private_buf
.buflen
)
1225 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1226 else if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1227 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
)
1228 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1233 * Finds the request corresponding to the RPC xid and invokes the common
1234 * tcp read code to read the data.
1236 static inline int xs_tcp_read_reply(struct rpc_xprt
*xprt
,
1237 struct xdr_skb_reader
*desc
)
1239 struct sock_xprt
*transport
=
1240 container_of(xprt
, struct sock_xprt
, xprt
);
1241 struct rpc_rqst
*req
;
1243 dprintk("RPC: read reply XID %08x\n", ntohl(transport
->tcp_xid
));
1245 /* Find and lock the request corresponding to this xid */
1246 spin_lock(&xprt
->transport_lock
);
1247 req
= xprt_lookup_rqst(xprt
, transport
->tcp_xid
);
1249 dprintk("RPC: XID %08x request not found!\n",
1250 ntohl(transport
->tcp_xid
));
1251 spin_unlock(&xprt
->transport_lock
);
1255 xs_tcp_read_common(xprt
, desc
, req
);
1257 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1258 xprt_complete_rqst(req
->rq_task
, transport
->tcp_copied
);
1260 spin_unlock(&xprt
->transport_lock
);
1264 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1266 * Obtains an rpc_rqst previously allocated and invokes the common
1267 * tcp read code to read the data. The result is placed in the callback
1269 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1270 * connection and return -1.
1272 static int xs_tcp_read_callback(struct rpc_xprt
*xprt
,
1273 struct xdr_skb_reader
*desc
)
1275 struct sock_xprt
*transport
=
1276 container_of(xprt
, struct sock_xprt
, xprt
);
1277 struct rpc_rqst
*req
;
1279 /* Look up and lock the request corresponding to the given XID */
1280 spin_lock(&xprt
->transport_lock
);
1281 req
= xprt_lookup_bc_request(xprt
, transport
->tcp_xid
);
1283 spin_unlock(&xprt
->transport_lock
);
1284 printk(KERN_WARNING
"Callback slot table overflowed\n");
1285 xprt_force_disconnect(xprt
);
1289 dprintk("RPC: read callback XID %08x\n", ntohl(req
->rq_xid
));
1290 xs_tcp_read_common(xprt
, desc
, req
);
1292 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1293 xprt_complete_bc_request(req
, transport
->tcp_copied
);
1294 spin_unlock(&xprt
->transport_lock
);
1299 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1300 struct xdr_skb_reader
*desc
)
1302 struct sock_xprt
*transport
=
1303 container_of(xprt
, struct sock_xprt
, xprt
);
1305 return (transport
->tcp_flags
& TCP_RPC_REPLY
) ?
1306 xs_tcp_read_reply(xprt
, desc
) :
1307 xs_tcp_read_callback(xprt
, desc
);
1310 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1311 struct xdr_skb_reader
*desc
)
1313 return xs_tcp_read_reply(xprt
, desc
);
1315 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1318 * Read data off the transport. This can be either an RPC_CALL or an
1319 * RPC_REPLY. Relay the processing to helper functions.
1321 static void xs_tcp_read_data(struct rpc_xprt
*xprt
,
1322 struct xdr_skb_reader
*desc
)
1324 struct sock_xprt
*transport
=
1325 container_of(xprt
, struct sock_xprt
, xprt
);
1327 if (_xs_tcp_read_data(xprt
, desc
) == 0)
1328 xs_tcp_check_fraghdr(transport
);
1331 * The transport_lock protects the request handling.
1332 * There's no need to hold it to update the tcp_flags.
1334 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1338 static inline void xs_tcp_read_discard(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1342 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1343 if (len
> desc
->count
)
1346 desc
->offset
+= len
;
1347 transport
->tcp_offset
+= len
;
1348 dprintk("RPC: discarded %Zu bytes\n", len
);
1349 xs_tcp_check_fraghdr(transport
);
1352 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
1354 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
1355 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1356 struct xdr_skb_reader desc
= {
1362 dprintk("RPC: xs_tcp_data_recv started\n");
1364 trace_xs_tcp_data_recv(transport
);
1365 /* Read in a new fragment marker if necessary */
1366 /* Can we ever really expect to get completely empty fragments? */
1367 if (transport
->tcp_flags
& TCP_RCV_COPY_FRAGHDR
) {
1368 xs_tcp_read_fraghdr(xprt
, &desc
);
1371 /* Read in the xid if necessary */
1372 if (transport
->tcp_flags
& TCP_RCV_COPY_XID
) {
1373 xs_tcp_read_xid(transport
, &desc
);
1376 /* Read in the call/reply flag */
1377 if (transport
->tcp_flags
& TCP_RCV_READ_CALLDIR
) {
1378 xs_tcp_read_calldir(transport
, &desc
);
1381 /* Read in the request data */
1382 if (transport
->tcp_flags
& TCP_RCV_COPY_DATA
) {
1383 xs_tcp_read_data(xprt
, &desc
);
1386 /* Skip over any trailing bytes on short reads */
1387 xs_tcp_read_discard(transport
, &desc
);
1388 } while (desc
.count
);
1389 trace_xs_tcp_data_recv(transport
);
1390 dprintk("RPC: xs_tcp_data_recv done\n");
1391 return len
- desc
.count
;
1395 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1396 * @sk: socket with data to read
1399 static void xs_tcp_data_ready(struct sock
*sk
)
1401 struct rpc_xprt
*xprt
;
1402 read_descriptor_t rd_desc
;
1404 unsigned long total
= 0;
1406 dprintk("RPC: xs_tcp_data_ready...\n");
1408 read_lock_bh(&sk
->sk_callback_lock
);
1409 if (!(xprt
= xprt_from_sock(sk
))) {
1413 /* Any data means we had a useful conversation, so
1414 * the we don't need to delay the next reconnect
1416 if (xprt
->reestablish_timeout
)
1417 xprt
->reestablish_timeout
= 0;
1419 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1420 rd_desc
.arg
.data
= xprt
;
1422 rd_desc
.count
= 65536;
1423 read
= tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
1428 trace_xs_tcp_data_ready(xprt
, read
, total
);
1429 read_unlock_bh(&sk
->sk_callback_lock
);
1433 * xs_tcp_state_change - callback to handle TCP socket state changes
1434 * @sk: socket whose state has changed
1437 static void xs_tcp_state_change(struct sock
*sk
)
1439 struct rpc_xprt
*xprt
;
1440 struct sock_xprt
*transport
;
1442 read_lock_bh(&sk
->sk_callback_lock
);
1443 if (!(xprt
= xprt_from_sock(sk
)))
1445 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
1446 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1447 sk
->sk_state
, xprt_connected(xprt
),
1448 sock_flag(sk
, SOCK_DEAD
),
1449 sock_flag(sk
, SOCK_ZAPPED
),
1452 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1453 trace_rpc_socket_state_change(xprt
, sk
->sk_socket
);
1454 switch (sk
->sk_state
) {
1455 case TCP_ESTABLISHED
:
1456 spin_lock(&xprt
->transport_lock
);
1457 if (!xprt_test_and_set_connected(xprt
)) {
1459 /* Reset TCP record info */
1460 transport
->tcp_offset
= 0;
1461 transport
->tcp_reclen
= 0;
1462 transport
->tcp_copied
= 0;
1463 transport
->tcp_flags
=
1464 TCP_RCV_COPY_FRAGHDR
| TCP_RCV_COPY_XID
;
1465 xprt
->connect_cookie
++;
1466 clear_bit(XPRT_SOCK_CONNECTING
, &transport
->sock_state
);
1467 xprt_clear_connecting(xprt
);
1469 xprt_wake_pending_tasks(xprt
, -EAGAIN
);
1471 spin_unlock(&xprt
->transport_lock
);
1474 /* The client initiated a shutdown of the socket */
1475 xprt
->connect_cookie
++;
1476 xprt
->reestablish_timeout
= 0;
1477 set_bit(XPRT_CLOSING
, &xprt
->state
);
1478 smp_mb__before_atomic();
1479 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1480 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1481 smp_mb__after_atomic();
1483 case TCP_CLOSE_WAIT
:
1484 /* The server initiated a shutdown of the socket */
1485 xprt
->connect_cookie
++;
1486 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1487 xs_tcp_force_close(xprt
);
1490 * If the server closed down the connection, make sure that
1491 * we back off before reconnecting
1493 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
1494 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1497 set_bit(XPRT_CLOSING
, &xprt
->state
);
1498 smp_mb__before_atomic();
1499 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1500 smp_mb__after_atomic();
1503 if (test_and_clear_bit(XPRT_SOCK_CONNECTING
,
1504 &transport
->sock_state
))
1505 xprt_clear_connecting(xprt
);
1506 xs_sock_mark_closed(xprt
);
1509 read_unlock_bh(&sk
->sk_callback_lock
);
1512 static void xs_write_space(struct sock
*sk
)
1514 struct socket
*sock
;
1515 struct rpc_xprt
*xprt
;
1517 if (unlikely(!(sock
= sk
->sk_socket
)))
1519 clear_bit(SOCK_NOSPACE
, &sock
->flags
);
1521 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1523 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
) == 0)
1526 xprt_write_space(xprt
);
1530 * xs_udp_write_space - callback invoked when socket buffer space
1532 * @sk: socket whose state has changed
1534 * Called when more output buffer space is available for this socket.
1535 * We try not to wake our writers until they can make "significant"
1536 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1537 * with a bunch of small requests.
1539 static void xs_udp_write_space(struct sock
*sk
)
1541 read_lock_bh(&sk
->sk_callback_lock
);
1543 /* from net/core/sock.c:sock_def_write_space */
1544 if (sock_writeable(sk
))
1547 read_unlock_bh(&sk
->sk_callback_lock
);
1551 * xs_tcp_write_space - callback invoked when socket buffer space
1553 * @sk: socket whose state has changed
1555 * Called when more output buffer space is available for this socket.
1556 * We try not to wake our writers until they can make "significant"
1557 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1558 * with a bunch of small requests.
1560 static void xs_tcp_write_space(struct sock
*sk
)
1562 read_lock_bh(&sk
->sk_callback_lock
);
1564 /* from net/core/stream.c:sk_stream_write_space */
1565 if (sk_stream_is_writeable(sk
))
1568 read_unlock_bh(&sk
->sk_callback_lock
);
1571 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1573 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1574 struct sock
*sk
= transport
->inet
;
1576 if (transport
->rcvsize
) {
1577 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1578 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1580 if (transport
->sndsize
) {
1581 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1582 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1583 sk
->sk_write_space(sk
);
1588 * xs_udp_set_buffer_size - set send and receive limits
1589 * @xprt: generic transport
1590 * @sndsize: requested size of send buffer, in bytes
1591 * @rcvsize: requested size of receive buffer, in bytes
1593 * Set socket send and receive buffer size limits.
1595 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1597 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1599 transport
->sndsize
= 0;
1601 transport
->sndsize
= sndsize
+ 1024;
1602 transport
->rcvsize
= 0;
1604 transport
->rcvsize
= rcvsize
+ 1024;
1606 xs_udp_do_set_buffer_size(xprt
);
1610 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1611 * @task: task that timed out
1613 * Adjust the congestion window after a retransmit timeout has occurred.
1615 static void xs_udp_timer(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1617 xprt_adjust_cwnd(xprt
, task
, -ETIMEDOUT
);
1620 static unsigned short xs_get_random_port(void)
1622 unsigned short range
= xprt_max_resvport
- xprt_min_resvport
;
1623 unsigned short rand
= (unsigned short) prandom_u32() % range
;
1624 return rand
+ xprt_min_resvport
;
1628 * xs_set_reuseaddr_port - set the socket's port and address reuse options
1631 * Note that this function has to be called on all sockets that share the
1632 * same port, and it must be called before binding.
1634 static void xs_sock_set_reuseport(struct socket
*sock
)
1638 kernel_setsockopt(sock
, SOL_SOCKET
, SO_REUSEPORT
,
1639 (char *)&opt
, sizeof(opt
));
1642 static unsigned short xs_sock_getport(struct socket
*sock
)
1644 struct sockaddr_storage buf
;
1646 unsigned short port
= 0;
1648 if (kernel_getsockname(sock
, (struct sockaddr
*)&buf
, &buflen
) < 0)
1650 switch (buf
.ss_family
) {
1652 port
= ntohs(((struct sockaddr_in6
*)&buf
)->sin6_port
);
1655 port
= ntohs(((struct sockaddr_in
*)&buf
)->sin_port
);
1662 * xs_set_port - reset the port number in the remote endpoint address
1663 * @xprt: generic transport
1664 * @port: new port number
1667 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1669 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1671 rpc_set_port(xs_addr(xprt
), port
);
1672 xs_update_peer_port(xprt
);
1675 static void xs_set_srcport(struct sock_xprt
*transport
, struct socket
*sock
)
1677 if (transport
->srcport
== 0)
1678 transport
->srcport
= xs_sock_getport(sock
);
1681 static unsigned short xs_get_srcport(struct sock_xprt
*transport
)
1683 unsigned short port
= transport
->srcport
;
1685 if (port
== 0 && transport
->xprt
.resvport
)
1686 port
= xs_get_random_port();
1690 static unsigned short xs_next_srcport(struct sock_xprt
*transport
, unsigned short port
)
1692 if (transport
->srcport
!= 0)
1693 transport
->srcport
= 0;
1694 if (!transport
->xprt
.resvport
)
1696 if (port
<= xprt_min_resvport
|| port
> xprt_max_resvport
)
1697 return xprt_max_resvport
;
1700 static int xs_bind(struct sock_xprt
*transport
, struct socket
*sock
)
1702 struct sockaddr_storage myaddr
;
1704 unsigned short port
= xs_get_srcport(transport
);
1705 unsigned short last
;
1708 * If we are asking for any ephemeral port (i.e. port == 0 &&
1709 * transport->xprt.resvport == 0), don't bind. Let the local
1710 * port selection happen implicitly when the socket is used
1711 * (for example at connect time).
1713 * This ensures that we can continue to establish TCP
1714 * connections even when all local ephemeral ports are already
1715 * a part of some TCP connection. This makes no difference
1716 * for UDP sockets, but also doens't harm them.
1718 * If we're asking for any reserved port (i.e. port == 0 &&
1719 * transport->xprt.resvport == 1) xs_get_srcport above will
1720 * ensure that port is non-zero and we will bind as needed.
1725 memcpy(&myaddr
, &transport
->srcaddr
, transport
->xprt
.addrlen
);
1727 rpc_set_port((struct sockaddr
*)&myaddr
, port
);
1728 err
= kernel_bind(sock
, (struct sockaddr
*)&myaddr
,
1729 transport
->xprt
.addrlen
);
1731 transport
->srcport
= port
;
1735 port
= xs_next_srcport(transport
, port
);
1738 } while (err
== -EADDRINUSE
&& nloop
!= 2);
1740 if (myaddr
.ss_family
== AF_INET
)
1741 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__
,
1742 &((struct sockaddr_in
*)&myaddr
)->sin_addr
,
1743 port
, err
? "failed" : "ok", err
);
1745 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__
,
1746 &((struct sockaddr_in6
*)&myaddr
)->sin6_addr
,
1747 port
, err
? "failed" : "ok", err
);
1752 * We don't support autobind on AF_LOCAL sockets
1754 static void xs_local_rpcbind(struct rpc_task
*task
)
1757 xprt_set_bound(rcu_dereference(task
->tk_client
->cl_xprt
));
1761 static void xs_local_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1765 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1766 static struct lock_class_key xs_key
[2];
1767 static struct lock_class_key xs_slock_key
[2];
1769 static inline void xs_reclassify_socketu(struct socket
*sock
)
1771 struct sock
*sk
= sock
->sk
;
1773 sock_lock_init_class_and_name(sk
, "slock-AF_LOCAL-RPC",
1774 &xs_slock_key
[1], "sk_lock-AF_LOCAL-RPC", &xs_key
[1]);
1777 static inline void xs_reclassify_socket4(struct socket
*sock
)
1779 struct sock
*sk
= sock
->sk
;
1781 sock_lock_init_class_and_name(sk
, "slock-AF_INET-RPC",
1782 &xs_slock_key
[0], "sk_lock-AF_INET-RPC", &xs_key
[0]);
1785 static inline void xs_reclassify_socket6(struct socket
*sock
)
1787 struct sock
*sk
= sock
->sk
;
1789 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-RPC",
1790 &xs_slock_key
[1], "sk_lock-AF_INET6-RPC", &xs_key
[1]);
1793 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1795 WARN_ON_ONCE(sock_owned_by_user(sock
->sk
));
1796 if (sock_owned_by_user(sock
->sk
))
1801 xs_reclassify_socketu(sock
);
1804 xs_reclassify_socket4(sock
);
1807 xs_reclassify_socket6(sock
);
1812 static inline void xs_reclassify_socketu(struct socket
*sock
)
1816 static inline void xs_reclassify_socket4(struct socket
*sock
)
1820 static inline void xs_reclassify_socket6(struct socket
*sock
)
1824 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1829 static void xs_dummy_setup_socket(struct work_struct
*work
)
1833 static struct socket
*xs_create_sock(struct rpc_xprt
*xprt
,
1834 struct sock_xprt
*transport
, int family
, int type
,
1835 int protocol
, bool reuseport
)
1837 struct socket
*sock
;
1840 err
= __sock_create(xprt
->xprt_net
, family
, type
, protocol
, &sock
, 1);
1842 dprintk("RPC: can't create %d transport socket (%d).\n",
1846 xs_reclassify_socket(family
, sock
);
1849 xs_sock_set_reuseport(sock
);
1851 err
= xs_bind(transport
, sock
);
1859 return ERR_PTR(err
);
1862 static int xs_local_finish_connecting(struct rpc_xprt
*xprt
,
1863 struct socket
*sock
)
1865 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1868 if (!transport
->inet
) {
1869 struct sock
*sk
= sock
->sk
;
1871 write_lock_bh(&sk
->sk_callback_lock
);
1873 xs_save_old_callbacks(transport
, sk
);
1875 sk
->sk_user_data
= xprt
;
1876 sk
->sk_data_ready
= xs_local_data_ready
;
1877 sk
->sk_write_space
= xs_udp_write_space
;
1878 sk
->sk_error_report
= xs_error_report
;
1879 sk
->sk_allocation
= GFP_NOIO
;
1881 xprt_clear_connected(xprt
);
1883 /* Reset to new socket */
1884 transport
->sock
= sock
;
1885 transport
->inet
= sk
;
1887 write_unlock_bh(&sk
->sk_callback_lock
);
1890 /* Tell the socket layer to start connecting... */
1891 xprt
->stat
.connect_count
++;
1892 xprt
->stat
.connect_start
= jiffies
;
1893 return kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, 0);
1897 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1898 * @transport: socket transport to connect
1900 static int xs_local_setup_socket(struct sock_xprt
*transport
)
1902 struct rpc_xprt
*xprt
= &transport
->xprt
;
1903 struct socket
*sock
;
1906 status
= __sock_create(xprt
->xprt_net
, AF_LOCAL
,
1907 SOCK_STREAM
, 0, &sock
, 1);
1909 dprintk("RPC: can't create AF_LOCAL "
1910 "transport socket (%d).\n", -status
);
1913 xs_reclassify_socketu(sock
);
1915 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1916 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1918 status
= xs_local_finish_connecting(xprt
, sock
);
1919 trace_rpc_socket_connect(xprt
, sock
, status
);
1922 dprintk("RPC: xprt %p connected to %s\n",
1923 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1924 xprt_set_connected(xprt
);
1928 dprintk("RPC: xprt %p: socket %s does not exist\n",
1929 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1932 dprintk("RPC: xprt %p: connection refused for %s\n",
1933 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1936 printk(KERN_ERR
"%s: unhandled error (%d) connecting to %s\n",
1938 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1942 xprt_clear_connecting(xprt
);
1943 xprt_wake_pending_tasks(xprt
, status
);
1947 static void xs_local_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1949 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1952 if (RPC_IS_ASYNC(task
)) {
1954 * We want the AF_LOCAL connect to be resolved in the
1955 * filesystem namespace of the process making the rpc
1956 * call. Thus we connect synchronously.
1958 * If we want to support asynchronous AF_LOCAL calls,
1959 * we'll need to figure out how to pass a namespace to
1962 rpc_exit(task
, -ENOTCONN
);
1965 ret
= xs_local_setup_socket(transport
);
1966 if (ret
&& !RPC_IS_SOFTCONN(task
))
1967 msleep_interruptible(15000);
1970 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
1972 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
1973 * know that we have exclusive access to the socket), to guard against
1974 * races with xs_reset_transport.
1976 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
1978 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1982 * If there's no sock, then we have nothing to set. The
1983 * reconnecting process will get it for us.
1985 if (!transport
->inet
)
1987 if (atomic_read(&xprt
->swapper
))
1988 sk_set_memalloc(transport
->inet
);
1992 * xs_enable_swap - Tag this transport as being used for swap.
1993 * @xprt: transport to tag
1995 * Take a reference to this transport on behalf of the rpc_clnt, and
1996 * optionally mark it for swapping if it wasn't already.
1999 xs_enable_swap(struct rpc_xprt
*xprt
)
2001 struct sock_xprt
*xs
= container_of(xprt
, struct sock_xprt
, xprt
);
2003 if (atomic_inc_return(&xprt
->swapper
) != 1)
2005 if (wait_on_bit_lock(&xprt
->state
, XPRT_LOCKED
, TASK_KILLABLE
))
2006 return -ERESTARTSYS
;
2008 sk_set_memalloc(xs
->inet
);
2009 xprt_release_xprt(xprt
, NULL
);
2014 * xs_disable_swap - Untag this transport as being used for swap.
2015 * @xprt: transport to tag
2017 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2018 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2021 xs_disable_swap(struct rpc_xprt
*xprt
)
2023 struct sock_xprt
*xs
= container_of(xprt
, struct sock_xprt
, xprt
);
2025 if (!atomic_dec_and_test(&xprt
->swapper
))
2027 if (wait_on_bit_lock(&xprt
->state
, XPRT_LOCKED
, TASK_KILLABLE
))
2030 sk_clear_memalloc(xs
->inet
);
2031 xprt_release_xprt(xprt
, NULL
);
2034 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2039 xs_enable_swap(struct rpc_xprt
*xprt
)
2045 xs_disable_swap(struct rpc_xprt
*xprt
)
2050 static void xs_udp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2052 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2054 if (!transport
->inet
) {
2055 struct sock
*sk
= sock
->sk
;
2057 write_lock_bh(&sk
->sk_callback_lock
);
2059 xs_save_old_callbacks(transport
, sk
);
2061 sk
->sk_user_data
= xprt
;
2062 sk
->sk_data_ready
= xs_udp_data_ready
;
2063 sk
->sk_write_space
= xs_udp_write_space
;
2064 sk
->sk_allocation
= GFP_NOIO
;
2066 xprt_set_connected(xprt
);
2068 /* Reset to new socket */
2069 transport
->sock
= sock
;
2070 transport
->inet
= sk
;
2072 xs_set_memalloc(xprt
);
2074 write_unlock_bh(&sk
->sk_callback_lock
);
2076 xs_udp_do_set_buffer_size(xprt
);
2079 static void xs_udp_setup_socket(struct work_struct
*work
)
2081 struct sock_xprt
*transport
=
2082 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2083 struct rpc_xprt
*xprt
= &transport
->xprt
;
2084 struct socket
*sock
= transport
->sock
;
2087 sock
= xs_create_sock(xprt
, transport
,
2088 xs_addr(xprt
)->sa_family
, SOCK_DGRAM
,
2089 IPPROTO_UDP
, false);
2093 dprintk("RPC: worker connecting xprt %p via %s to "
2094 "%s (port %s)\n", xprt
,
2095 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2096 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2097 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2099 xs_udp_finish_connecting(xprt
, sock
);
2100 trace_rpc_socket_connect(xprt
, sock
, 0);
2103 xprt_unlock_connect(xprt
, transport
);
2104 xprt_clear_connecting(xprt
);
2105 xprt_wake_pending_tasks(xprt
, status
);
2109 * xs_tcp_shutdown - gracefully shut down a TCP socket
2112 * Initiates a graceful shutdown of the TCP socket by calling the
2113 * equivalent of shutdown(SHUT_RDWR);
2115 static void xs_tcp_shutdown(struct rpc_xprt
*xprt
)
2117 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2118 struct socket
*sock
= transport
->sock
;
2122 if (xprt_connected(xprt
)) {
2123 kernel_sock_shutdown(sock
, SHUT_RDWR
);
2124 trace_rpc_socket_shutdown(xprt
, sock
);
2126 xs_reset_transport(transport
);
2129 static int xs_tcp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2131 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2132 int ret
= -ENOTCONN
;
2134 if (!transport
->inet
) {
2135 struct sock
*sk
= sock
->sk
;
2136 unsigned int keepidle
= xprt
->timeout
->to_initval
/ HZ
;
2137 unsigned int keepcnt
= xprt
->timeout
->to_retries
+ 1;
2138 unsigned int opt_on
= 1;
2141 /* TCP Keepalive options */
2142 kernel_setsockopt(sock
, SOL_SOCKET
, SO_KEEPALIVE
,
2143 (char *)&opt_on
, sizeof(opt_on
));
2144 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPIDLE
,
2145 (char *)&keepidle
, sizeof(keepidle
));
2146 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPINTVL
,
2147 (char *)&keepidle
, sizeof(keepidle
));
2148 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPCNT
,
2149 (char *)&keepcnt
, sizeof(keepcnt
));
2151 /* TCP user timeout (see RFC5482) */
2152 timeo
= jiffies_to_msecs(xprt
->timeout
->to_initval
) *
2153 (xprt
->timeout
->to_retries
+ 1);
2154 kernel_setsockopt(sock
, SOL_TCP
, TCP_USER_TIMEOUT
,
2155 (char *)&timeo
, sizeof(timeo
));
2157 write_lock_bh(&sk
->sk_callback_lock
);
2159 xs_save_old_callbacks(transport
, sk
);
2161 sk
->sk_user_data
= xprt
;
2162 sk
->sk_data_ready
= xs_tcp_data_ready
;
2163 sk
->sk_state_change
= xs_tcp_state_change
;
2164 sk
->sk_write_space
= xs_tcp_write_space
;
2165 sk
->sk_error_report
= xs_error_report
;
2166 sk
->sk_allocation
= GFP_NOIO
;
2168 /* socket options */
2169 sock_reset_flag(sk
, SOCK_LINGER
);
2170 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
2172 xprt_clear_connected(xprt
);
2174 /* Reset to new socket */
2175 transport
->sock
= sock
;
2176 transport
->inet
= sk
;
2178 write_unlock_bh(&sk
->sk_callback_lock
);
2181 if (!xprt_bound(xprt
))
2184 xs_set_memalloc(xprt
);
2186 /* Tell the socket layer to start connecting... */
2187 xprt
->stat
.connect_count
++;
2188 xprt
->stat
.connect_start
= jiffies
;
2189 set_bit(XPRT_SOCK_CONNECTING
, &transport
->sock_state
);
2190 ret
= kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, O_NONBLOCK
);
2193 xs_set_srcport(transport
, sock
);
2196 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2197 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2204 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2206 * Invoked by a work queue tasklet.
2208 static void xs_tcp_setup_socket(struct work_struct
*work
)
2210 struct sock_xprt
*transport
=
2211 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2212 struct socket
*sock
= transport
->sock
;
2213 struct rpc_xprt
*xprt
= &transport
->xprt
;
2217 sock
= xs_create_sock(xprt
, transport
,
2218 xs_addr(xprt
)->sa_family
, SOCK_STREAM
,
2221 status
= PTR_ERR(sock
);
2226 dprintk("RPC: worker connecting xprt %p via %s to "
2227 "%s (port %s)\n", xprt
,
2228 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2229 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2230 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2232 status
= xs_tcp_finish_connecting(xprt
, sock
);
2233 trace_rpc_socket_connect(xprt
, sock
, status
);
2234 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2235 xprt
, -status
, xprt_connected(xprt
),
2236 sock
->sk
->sk_state
);
2239 printk("%s: connect returned unhandled error %d\n",
2241 case -EADDRNOTAVAIL
:
2242 /* We're probably in TIME_WAIT. Get rid of existing socket,
2245 xs_tcp_force_close(xprt
);
2250 xprt_unlock_connect(xprt
, transport
);
2253 /* Happens, for instance, if the user specified a link
2254 * local IPv6 address without a scope-id.
2261 /* retry with existing socket, after a delay */
2262 xs_tcp_force_close(xprt
);
2267 xprt_unlock_connect(xprt
, transport
);
2268 xprt_clear_connecting(xprt
);
2269 xprt_wake_pending_tasks(xprt
, status
);
2273 * xs_connect - connect a socket to a remote endpoint
2274 * @xprt: pointer to transport structure
2275 * @task: address of RPC task that manages state of connect request
2277 * TCP: If the remote end dropped the connection, delay reconnecting.
2279 * UDP socket connects are synchronous, but we use a work queue anyway
2280 * to guarantee that even unprivileged user processes can set up a
2281 * socket on a privileged port.
2283 * If a UDP socket connect fails, the delay behavior here prevents
2284 * retry floods (hard mounts).
2286 static void xs_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
2288 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2290 WARN_ON_ONCE(!xprt_lock_connect(xprt
, task
, transport
));
2292 if (transport
->sock
!= NULL
) {
2293 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2295 xprt
, xprt
->reestablish_timeout
/ HZ
);
2297 /* Start by resetting any existing state */
2298 xs_reset_transport(transport
);
2300 queue_delayed_work(rpciod_workqueue
,
2301 &transport
->connect_worker
,
2302 xprt
->reestablish_timeout
);
2303 xprt
->reestablish_timeout
<<= 1;
2304 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2305 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2306 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
2307 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
2309 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
2310 queue_delayed_work(rpciod_workqueue
,
2311 &transport
->connect_worker
, 0);
2316 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2317 * @xprt: rpc_xprt struct containing statistics
2321 static void xs_local_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2325 if (xprt_connected(xprt
))
2326 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2328 seq_printf(seq
, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2329 "%llu %llu %lu %llu %llu\n",
2330 xprt
->stat
.bind_count
,
2331 xprt
->stat
.connect_count
,
2332 xprt
->stat
.connect_time
,
2336 xprt
->stat
.bad_xids
,
2339 xprt
->stat
.max_slots
,
2340 xprt
->stat
.sending_u
,
2341 xprt
->stat
.pending_u
);
2345 * xs_udp_print_stats - display UDP socket-specifc stats
2346 * @xprt: rpc_xprt struct containing statistics
2350 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2352 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2354 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2357 xprt
->stat
.bind_count
,
2360 xprt
->stat
.bad_xids
,
2363 xprt
->stat
.max_slots
,
2364 xprt
->stat
.sending_u
,
2365 xprt
->stat
.pending_u
);
2369 * xs_tcp_print_stats - display TCP socket-specifc stats
2370 * @xprt: rpc_xprt struct containing statistics
2374 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2376 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2379 if (xprt_connected(xprt
))
2380 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2382 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2383 "%llu %llu %lu %llu %llu\n",
2385 xprt
->stat
.bind_count
,
2386 xprt
->stat
.connect_count
,
2387 xprt
->stat
.connect_time
,
2391 xprt
->stat
.bad_xids
,
2394 xprt
->stat
.max_slots
,
2395 xprt
->stat
.sending_u
,
2396 xprt
->stat
.pending_u
);
2400 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2401 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2402 * to use the server side send routines.
2404 static void *bc_malloc(struct rpc_task
*task
, size_t size
)
2407 struct rpc_buffer
*buf
;
2409 WARN_ON_ONCE(size
> PAGE_SIZE
- sizeof(struct rpc_buffer
));
2410 if (size
> PAGE_SIZE
- sizeof(struct rpc_buffer
))
2413 page
= alloc_page(GFP_KERNEL
);
2417 buf
= page_address(page
);
2418 buf
->len
= PAGE_SIZE
;
2424 * Free the space allocated in the bc_alloc routine
2426 static void bc_free(void *buffer
)
2428 struct rpc_buffer
*buf
;
2433 buf
= container_of(buffer
, struct rpc_buffer
, data
);
2434 free_page((unsigned long)buf
);
2438 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2439 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2441 static int bc_sendto(struct rpc_rqst
*req
)
2444 struct xdr_buf
*xbufp
= &req
->rq_snd_buf
;
2445 struct rpc_xprt
*xprt
= req
->rq_xprt
;
2446 struct sock_xprt
*transport
=
2447 container_of(xprt
, struct sock_xprt
, xprt
);
2448 struct socket
*sock
= transport
->sock
;
2449 unsigned long headoff
;
2450 unsigned long tailoff
;
2452 xs_encode_stream_record_marker(xbufp
);
2454 tailoff
= (unsigned long)xbufp
->tail
[0].iov_base
& ~PAGE_MASK
;
2455 headoff
= (unsigned long)xbufp
->head
[0].iov_base
& ~PAGE_MASK
;
2456 len
= svc_send_common(sock
, xbufp
,
2457 virt_to_page(xbufp
->head
[0].iov_base
), headoff
,
2458 xbufp
->tail
[0].iov_base
, tailoff
);
2460 if (len
!= xbufp
->len
) {
2461 printk(KERN_NOTICE
"Error sending entire callback!\n");
2469 * The send routine. Borrows from svc_send
2471 static int bc_send_request(struct rpc_task
*task
)
2473 struct rpc_rqst
*req
= task
->tk_rqstp
;
2474 struct svc_xprt
*xprt
;
2477 dprintk("sending request with xid: %08x\n", ntohl(req
->rq_xid
));
2479 * Get the server socket associated with this callback xprt
2481 xprt
= req
->rq_xprt
->bc_xprt
;
2484 * Grab the mutex to serialize data as the connection is shared
2485 * with the fore channel
2487 if (!mutex_trylock(&xprt
->xpt_mutex
)) {
2488 rpc_sleep_on(&xprt
->xpt_bc_pending
, task
, NULL
);
2489 if (!mutex_trylock(&xprt
->xpt_mutex
))
2491 rpc_wake_up_queued_task(&xprt
->xpt_bc_pending
, task
);
2493 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
))
2496 len
= bc_sendto(req
);
2497 mutex_unlock(&xprt
->xpt_mutex
);
2506 * The close routine. Since this is client initiated, we do nothing
2509 static void bc_close(struct rpc_xprt
*xprt
)
2514 * The xprt destroy routine. Again, because this connection is client
2515 * initiated, we do nothing
2518 static void bc_destroy(struct rpc_xprt
*xprt
)
2520 dprintk("RPC: bc_destroy xprt %p\n", xprt
);
2523 module_put(THIS_MODULE
);
2526 static struct rpc_xprt_ops xs_local_ops
= {
2527 .reserve_xprt
= xprt_reserve_xprt
,
2528 .release_xprt
= xs_tcp_release_xprt
,
2529 .alloc_slot
= xprt_alloc_slot
,
2530 .rpcbind
= xs_local_rpcbind
,
2531 .set_port
= xs_local_set_port
,
2532 .connect
= xs_local_connect
,
2533 .buf_alloc
= rpc_malloc
,
2534 .buf_free
= rpc_free
,
2535 .send_request
= xs_local_send_request
,
2536 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2538 .destroy
= xs_destroy
,
2539 .print_stats
= xs_local_print_stats
,
2540 .enable_swap
= xs_enable_swap
,
2541 .disable_swap
= xs_disable_swap
,
2544 static struct rpc_xprt_ops xs_udp_ops
= {
2545 .set_buffer_size
= xs_udp_set_buffer_size
,
2546 .reserve_xprt
= xprt_reserve_xprt_cong
,
2547 .release_xprt
= xprt_release_xprt_cong
,
2548 .alloc_slot
= xprt_alloc_slot
,
2549 .rpcbind
= rpcb_getport_async
,
2550 .set_port
= xs_set_port
,
2551 .connect
= xs_connect
,
2552 .buf_alloc
= rpc_malloc
,
2553 .buf_free
= rpc_free
,
2554 .send_request
= xs_udp_send_request
,
2555 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
2556 .timer
= xs_udp_timer
,
2557 .release_request
= xprt_release_rqst_cong
,
2559 .destroy
= xs_destroy
,
2560 .print_stats
= xs_udp_print_stats
,
2561 .enable_swap
= xs_enable_swap
,
2562 .disable_swap
= xs_disable_swap
,
2563 .inject_disconnect
= xs_inject_disconnect
,
2566 static struct rpc_xprt_ops xs_tcp_ops
= {
2567 .reserve_xprt
= xprt_reserve_xprt
,
2568 .release_xprt
= xs_tcp_release_xprt
,
2569 .alloc_slot
= xprt_lock_and_alloc_slot
,
2570 .rpcbind
= rpcb_getport_async
,
2571 .set_port
= xs_set_port
,
2572 .connect
= xs_connect
,
2573 .buf_alloc
= rpc_malloc
,
2574 .buf_free
= rpc_free
,
2575 .send_request
= xs_tcp_send_request
,
2576 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2577 .close
= xs_tcp_shutdown
,
2578 .destroy
= xs_destroy
,
2579 .print_stats
= xs_tcp_print_stats
,
2580 .enable_swap
= xs_enable_swap
,
2581 .disable_swap
= xs_disable_swap
,
2582 .inject_disconnect
= xs_inject_disconnect
,
2586 * The rpc_xprt_ops for the server backchannel
2589 static struct rpc_xprt_ops bc_tcp_ops
= {
2590 .reserve_xprt
= xprt_reserve_xprt
,
2591 .release_xprt
= xprt_release_xprt
,
2592 .alloc_slot
= xprt_alloc_slot
,
2593 .buf_alloc
= bc_malloc
,
2594 .buf_free
= bc_free
,
2595 .send_request
= bc_send_request
,
2596 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2598 .destroy
= bc_destroy
,
2599 .print_stats
= xs_tcp_print_stats
,
2600 .enable_swap
= xs_enable_swap
,
2601 .disable_swap
= xs_disable_swap
,
2602 .inject_disconnect
= xs_inject_disconnect
,
2605 static int xs_init_anyaddr(const int family
, struct sockaddr
*sap
)
2607 static const struct sockaddr_in sin
= {
2608 .sin_family
= AF_INET
,
2609 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
2611 static const struct sockaddr_in6 sin6
= {
2612 .sin6_family
= AF_INET6
,
2613 .sin6_addr
= IN6ADDR_ANY_INIT
,
2620 memcpy(sap
, &sin
, sizeof(sin
));
2623 memcpy(sap
, &sin6
, sizeof(sin6
));
2626 dprintk("RPC: %s: Bad address family\n", __func__
);
2627 return -EAFNOSUPPORT
;
2632 static struct rpc_xprt
*xs_setup_xprt(struct xprt_create
*args
,
2633 unsigned int slot_table_size
,
2634 unsigned int max_slot_table_size
)
2636 struct rpc_xprt
*xprt
;
2637 struct sock_xprt
*new;
2639 if (args
->addrlen
> sizeof(xprt
->addr
)) {
2640 dprintk("RPC: xs_setup_xprt: address too large\n");
2641 return ERR_PTR(-EBADF
);
2644 xprt
= xprt_alloc(args
->net
, sizeof(*new), slot_table_size
,
2645 max_slot_table_size
);
2647 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2649 return ERR_PTR(-ENOMEM
);
2652 new = container_of(xprt
, struct sock_xprt
, xprt
);
2653 memcpy(&xprt
->addr
, args
->dstaddr
, args
->addrlen
);
2654 xprt
->addrlen
= args
->addrlen
;
2656 memcpy(&new->srcaddr
, args
->srcaddr
, args
->addrlen
);
2659 err
= xs_init_anyaddr(args
->dstaddr
->sa_family
,
2660 (struct sockaddr
*)&new->srcaddr
);
2663 return ERR_PTR(err
);
2670 static const struct rpc_timeout xs_local_default_timeout
= {
2671 .to_initval
= 10 * HZ
,
2672 .to_maxval
= 10 * HZ
,
2677 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2678 * @args: rpc transport creation arguments
2680 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2682 static struct rpc_xprt
*xs_setup_local(struct xprt_create
*args
)
2684 struct sockaddr_un
*sun
= (struct sockaddr_un
*)args
->dstaddr
;
2685 struct sock_xprt
*transport
;
2686 struct rpc_xprt
*xprt
;
2687 struct rpc_xprt
*ret
;
2689 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2690 xprt_max_tcp_slot_table_entries
);
2693 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2696 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2697 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2699 xprt
->bind_timeout
= XS_BIND_TO
;
2700 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2701 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2703 xprt
->ops
= &xs_local_ops
;
2704 xprt
->timeout
= &xs_local_default_timeout
;
2706 INIT_DELAYED_WORK(&transport
->connect_worker
,
2707 xs_dummy_setup_socket
);
2709 switch (sun
->sun_family
) {
2711 if (sun
->sun_path
[0] != '/') {
2712 dprintk("RPC: bad AF_LOCAL address: %s\n",
2714 ret
= ERR_PTR(-EINVAL
);
2717 xprt_set_bound(xprt
);
2718 xs_format_peer_addresses(xprt
, "local", RPCBIND_NETID_LOCAL
);
2719 ret
= ERR_PTR(xs_local_setup_socket(transport
));
2724 ret
= ERR_PTR(-EAFNOSUPPORT
);
2728 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2729 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2731 if (try_module_get(THIS_MODULE
))
2733 ret
= ERR_PTR(-EINVAL
);
2739 static const struct rpc_timeout xs_udp_default_timeout
= {
2740 .to_initval
= 5 * HZ
,
2741 .to_maxval
= 30 * HZ
,
2742 .to_increment
= 5 * HZ
,
2747 * xs_setup_udp - Set up transport to use a UDP socket
2748 * @args: rpc transport creation arguments
2751 static struct rpc_xprt
*xs_setup_udp(struct xprt_create
*args
)
2753 struct sockaddr
*addr
= args
->dstaddr
;
2754 struct rpc_xprt
*xprt
;
2755 struct sock_xprt
*transport
;
2756 struct rpc_xprt
*ret
;
2758 xprt
= xs_setup_xprt(args
, xprt_udp_slot_table_entries
,
2759 xprt_udp_slot_table_entries
);
2762 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2764 xprt
->prot
= IPPROTO_UDP
;
2766 /* XXX: header size can vary due to auth type, IPv6, etc. */
2767 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
2769 xprt
->bind_timeout
= XS_BIND_TO
;
2770 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
2771 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2773 xprt
->ops
= &xs_udp_ops
;
2775 xprt
->timeout
= &xs_udp_default_timeout
;
2777 switch (addr
->sa_family
) {
2779 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2780 xprt_set_bound(xprt
);
2782 INIT_DELAYED_WORK(&transport
->connect_worker
,
2783 xs_udp_setup_socket
);
2784 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP
);
2787 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2788 xprt_set_bound(xprt
);
2790 INIT_DELAYED_WORK(&transport
->connect_worker
,
2791 xs_udp_setup_socket
);
2792 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP6
);
2795 ret
= ERR_PTR(-EAFNOSUPPORT
);
2799 if (xprt_bound(xprt
))
2800 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2801 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2802 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2803 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2805 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2806 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2807 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2809 if (try_module_get(THIS_MODULE
))
2811 ret
= ERR_PTR(-EINVAL
);
2817 static const struct rpc_timeout xs_tcp_default_timeout
= {
2818 .to_initval
= 60 * HZ
,
2819 .to_maxval
= 60 * HZ
,
2824 * xs_setup_tcp - Set up transport to use a TCP socket
2825 * @args: rpc transport creation arguments
2828 static struct rpc_xprt
*xs_setup_tcp(struct xprt_create
*args
)
2830 struct sockaddr
*addr
= args
->dstaddr
;
2831 struct rpc_xprt
*xprt
;
2832 struct sock_xprt
*transport
;
2833 struct rpc_xprt
*ret
;
2834 unsigned int max_slot_table_size
= xprt_max_tcp_slot_table_entries
;
2836 if (args
->flags
& XPRT_CREATE_INFINITE_SLOTS
)
2837 max_slot_table_size
= RPC_MAX_SLOT_TABLE_LIMIT
;
2839 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2840 max_slot_table_size
);
2843 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2845 xprt
->prot
= IPPROTO_TCP
;
2846 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2847 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2849 xprt
->bind_timeout
= XS_BIND_TO
;
2850 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2851 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2853 xprt
->ops
= &xs_tcp_ops
;
2854 xprt
->timeout
= &xs_tcp_default_timeout
;
2856 switch (addr
->sa_family
) {
2858 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2859 xprt_set_bound(xprt
);
2861 INIT_DELAYED_WORK(&transport
->connect_worker
,
2862 xs_tcp_setup_socket
);
2863 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP
);
2866 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2867 xprt_set_bound(xprt
);
2869 INIT_DELAYED_WORK(&transport
->connect_worker
,
2870 xs_tcp_setup_socket
);
2871 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP6
);
2874 ret
= ERR_PTR(-EAFNOSUPPORT
);
2878 if (xprt_bound(xprt
))
2879 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2880 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2881 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2882 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2884 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2885 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2886 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2888 if (try_module_get(THIS_MODULE
))
2890 ret
= ERR_PTR(-EINVAL
);
2897 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2898 * @args: rpc transport creation arguments
2901 static struct rpc_xprt
*xs_setup_bc_tcp(struct xprt_create
*args
)
2903 struct sockaddr
*addr
= args
->dstaddr
;
2904 struct rpc_xprt
*xprt
;
2905 struct sock_xprt
*transport
;
2906 struct svc_sock
*bc_sock
;
2907 struct rpc_xprt
*ret
;
2909 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2910 xprt_tcp_slot_table_entries
);
2913 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2915 xprt
->prot
= IPPROTO_TCP
;
2916 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2917 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2918 xprt
->timeout
= &xs_tcp_default_timeout
;
2921 xprt_set_bound(xprt
);
2922 xprt
->bind_timeout
= 0;
2923 xprt
->reestablish_timeout
= 0;
2924 xprt
->idle_timeout
= 0;
2926 xprt
->ops
= &bc_tcp_ops
;
2928 switch (addr
->sa_family
) {
2930 xs_format_peer_addresses(xprt
, "tcp",
2934 xs_format_peer_addresses(xprt
, "tcp",
2935 RPCBIND_NETID_TCP6
);
2938 ret
= ERR_PTR(-EAFNOSUPPORT
);
2942 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2943 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2944 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2945 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2948 * Once we've associated a backchannel xprt with a connection,
2949 * we want to keep it around as long as the connection lasts,
2950 * in case we need to start using it for a backchannel again;
2951 * this reference won't be dropped until bc_xprt is destroyed.
2954 args
->bc_xprt
->xpt_bc_xprt
= xprt
;
2955 xprt
->bc_xprt
= args
->bc_xprt
;
2956 bc_sock
= container_of(args
->bc_xprt
, struct svc_sock
, sk_xprt
);
2957 transport
->sock
= bc_sock
->sk_sock
;
2958 transport
->inet
= bc_sock
->sk_sk
;
2961 * Since we don't want connections for the backchannel, we set
2962 * the xprt status to connected
2964 xprt_set_connected(xprt
);
2966 if (try_module_get(THIS_MODULE
))
2969 args
->bc_xprt
->xpt_bc_xprt
= NULL
;
2971 ret
= ERR_PTR(-EINVAL
);
2977 static struct xprt_class xs_local_transport
= {
2978 .list
= LIST_HEAD_INIT(xs_local_transport
.list
),
2979 .name
= "named UNIX socket",
2980 .owner
= THIS_MODULE
,
2981 .ident
= XPRT_TRANSPORT_LOCAL
,
2982 .setup
= xs_setup_local
,
2985 static struct xprt_class xs_udp_transport
= {
2986 .list
= LIST_HEAD_INIT(xs_udp_transport
.list
),
2988 .owner
= THIS_MODULE
,
2989 .ident
= XPRT_TRANSPORT_UDP
,
2990 .setup
= xs_setup_udp
,
2993 static struct xprt_class xs_tcp_transport
= {
2994 .list
= LIST_HEAD_INIT(xs_tcp_transport
.list
),
2996 .owner
= THIS_MODULE
,
2997 .ident
= XPRT_TRANSPORT_TCP
,
2998 .setup
= xs_setup_tcp
,
3001 static struct xprt_class xs_bc_tcp_transport
= {
3002 .list
= LIST_HEAD_INIT(xs_bc_tcp_transport
.list
),
3003 .name
= "tcp NFSv4.1 backchannel",
3004 .owner
= THIS_MODULE
,
3005 .ident
= XPRT_TRANSPORT_BC_TCP
,
3006 .setup
= xs_setup_bc_tcp
,
3010 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3013 int init_socket_xprt(void)
3015 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3016 if (!sunrpc_table_header
)
3017 sunrpc_table_header
= register_sysctl_table(sunrpc_table
);
3020 xprt_register_transport(&xs_local_transport
);
3021 xprt_register_transport(&xs_udp_transport
);
3022 xprt_register_transport(&xs_tcp_transport
);
3023 xprt_register_transport(&xs_bc_tcp_transport
);
3029 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3032 void cleanup_socket_xprt(void)
3034 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3035 if (sunrpc_table_header
) {
3036 unregister_sysctl_table(sunrpc_table_header
);
3037 sunrpc_table_header
= NULL
;
3041 xprt_unregister_transport(&xs_local_transport
);
3042 xprt_unregister_transport(&xs_udp_transport
);
3043 xprt_unregister_transport(&xs_tcp_transport
);
3044 xprt_unregister_transport(&xs_bc_tcp_transport
);
3047 static int param_set_uint_minmax(const char *val
,
3048 const struct kernel_param
*kp
,
3049 unsigned int min
, unsigned int max
)
3056 ret
= kstrtouint(val
, 0, &num
);
3057 if (ret
== -EINVAL
|| num
< min
|| num
> max
)
3059 *((unsigned int *)kp
->arg
) = num
;
3063 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
3065 return param_set_uint_minmax(val
, kp
,
3070 static const struct kernel_param_ops param_ops_portnr
= {
3071 .set
= param_set_portnr
,
3072 .get
= param_get_uint
,
3075 #define param_check_portnr(name, p) \
3076 __param_check(name, p, unsigned int);
3078 module_param_named(min_resvport
, xprt_min_resvport
, portnr
, 0644);
3079 module_param_named(max_resvport
, xprt_max_resvport
, portnr
, 0644);
3081 static int param_set_slot_table_size(const char *val
,
3082 const struct kernel_param
*kp
)
3084 return param_set_uint_minmax(val
, kp
,
3086 RPC_MAX_SLOT_TABLE
);
3089 static const struct kernel_param_ops param_ops_slot_table_size
= {
3090 .set
= param_set_slot_table_size
,
3091 .get
= param_get_uint
,
3094 #define param_check_slot_table_size(name, p) \
3095 __param_check(name, p, unsigned int);
3097 static int param_set_max_slot_table_size(const char *val
,
3098 const struct kernel_param
*kp
)
3100 return param_set_uint_minmax(val
, kp
,
3102 RPC_MAX_SLOT_TABLE_LIMIT
);
3105 static const struct kernel_param_ops param_ops_max_slot_table_size
= {
3106 .set
= param_set_max_slot_table_size
,
3107 .get
= param_get_uint
,
3110 #define param_check_max_slot_table_size(name, p) \
3111 __param_check(name, p, unsigned int);
3113 module_param_named(tcp_slot_table_entries
, xprt_tcp_slot_table_entries
,
3114 slot_table_size
, 0644);
3115 module_param_named(tcp_max_slot_table_entries
, xprt_max_tcp_slot_table_entries
,
3116 max_slot_table_size
, 0644);
3117 module_param_named(udp_slot_table_entries
, xprt_udp_slot_table_entries
,
3118 slot_table_size
, 0644);