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
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
,
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
;
366 flags
|= MSG_SENDPAGE_NOTLAST
| MSG_MORE
;
367 err
= do_sendpage(sock
, *ppage
, base
, len
, flags
);
368 if (remainder
== 0 || err
!= len
)
382 * xs_sendpages - write pages directly to a socket
383 * @sock: socket to send on
384 * @addr: UDP only -- address of destination
385 * @addrlen: UDP only -- length of destination address
386 * @xdr: buffer containing this request
387 * @base: starting position in the buffer
388 * @zerocopy: true if it is safe to use sendpage()
389 * @sent_p: return the total number of bytes successfully queued for sending
392 static int xs_sendpages(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct xdr_buf
*xdr
, unsigned int base
, bool zerocopy
, int *sent_p
)
394 unsigned int remainder
= xdr
->len
- base
;
406 if (base
< xdr
->head
[0].iov_len
|| addr
!= NULL
) {
407 unsigned int len
= xdr
->head
[0].iov_len
- base
;
409 err
= xs_send_kvec(sock
, addr
, addrlen
, &xdr
->head
[0], base
, remainder
!= 0);
410 if (remainder
== 0 || err
!= len
)
415 base
-= xdr
->head
[0].iov_len
;
417 if (base
< xdr
->page_len
) {
418 unsigned int len
= xdr
->page_len
- base
;
420 err
= xs_send_pagedata(sock
, xdr
, base
, remainder
!= 0, zerocopy
, &sent
);
422 if (remainder
== 0 || sent
!= len
)
426 base
-= xdr
->page_len
;
428 if (base
>= xdr
->tail
[0].iov_len
)
430 err
= xs_send_kvec(sock
, NULL
, 0, &xdr
->tail
[0], base
, 0);
439 static void xs_nospace_callback(struct rpc_task
*task
)
441 struct sock_xprt
*transport
= container_of(task
->tk_rqstp
->rq_xprt
, struct sock_xprt
, xprt
);
443 transport
->inet
->sk_write_pending
--;
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 /* wait for more buffer space */
469 sk
->sk_write_pending
++;
470 xprt_wait_for_buffer_space(task
, xs_nospace_callback
);
474 spin_unlock_bh(&xprt
->transport_lock
);
476 /* Race breaker in case memory is freed before above code is called */
477 sk
->sk_write_space(sk
);
482 * Construct a stream transport record marker in @buf.
484 static inline void xs_encode_stream_record_marker(struct xdr_buf
*buf
)
486 u32 reclen
= buf
->len
- sizeof(rpc_fraghdr
);
487 rpc_fraghdr
*base
= buf
->head
[0].iov_base
;
488 *base
= cpu_to_be32(RPC_LAST_STREAM_FRAGMENT
| reclen
);
492 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
493 * @task: RPC task that manages the state of an RPC request
496 * 0: The request has been sent
497 * EAGAIN: The socket was blocked, please call again later to
498 * complete the request
499 * ENOTCONN: Caller needs to invoke connect logic then call again
500 * other: Some other error occured, the request was not sent
502 static int xs_local_send_request(struct rpc_task
*task
)
504 struct rpc_rqst
*req
= task
->tk_rqstp
;
505 struct rpc_xprt
*xprt
= req
->rq_xprt
;
506 struct sock_xprt
*transport
=
507 container_of(xprt
, struct sock_xprt
, xprt
);
508 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
512 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
514 xs_pktdump("packet data:",
515 req
->rq_svec
->iov_base
, req
->rq_svec
->iov_len
);
517 status
= xs_sendpages(transport
->sock
, NULL
, 0, xdr
, req
->rq_bytes_sent
,
519 dprintk("RPC: %s(%u) = %d\n",
520 __func__
, xdr
->len
- req
->rq_bytes_sent
, status
);
522 if (status
== -EAGAIN
&& sock_writeable(transport
->inet
))
525 if (likely(sent
> 0) || status
== 0) {
526 req
->rq_bytes_sent
+= sent
;
527 req
->rq_xmit_bytes_sent
+= sent
;
528 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
529 req
->rq_bytes_sent
= 0;
539 status
= xs_nospace(task
);
542 dprintk("RPC: sendmsg returned unrecognized error %d\n",
553 * xs_udp_send_request - write an RPC request to a UDP socket
554 * @task: address of RPC task that manages the state of an RPC request
557 * 0: The request has been sent
558 * EAGAIN: The socket was blocked, please call again later to
559 * complete the request
560 * ENOTCONN: Caller needs to invoke connect logic then call again
561 * other: Some other error occurred, the request was not sent
563 static int xs_udp_send_request(struct rpc_task
*task
)
565 struct rpc_rqst
*req
= task
->tk_rqstp
;
566 struct rpc_xprt
*xprt
= req
->rq_xprt
;
567 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
568 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
572 xs_pktdump("packet data:",
573 req
->rq_svec
->iov_base
,
574 req
->rq_svec
->iov_len
);
576 if (!xprt_bound(xprt
))
578 status
= xs_sendpages(transport
->sock
, xs_addr(xprt
), xprt
->addrlen
,
579 xdr
, req
->rq_bytes_sent
, true, &sent
);
581 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
582 xdr
->len
- req
->rq_bytes_sent
, status
);
584 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
585 if (status
== -EPERM
)
588 if (status
== -EAGAIN
&& sock_writeable(transport
->inet
))
591 if (sent
> 0 || status
== 0) {
592 req
->rq_xmit_bytes_sent
+= sent
;
593 if (sent
>= req
->rq_slen
)
595 /* Still some bytes left; set up for a retry later. */
603 /* Should we call xs_close() here? */
606 status
= xs_nospace(task
);
613 /* When the server has died, an ICMP port unreachable message
614 * prompts ECONNREFUSED. */
617 dprintk("RPC: sendmsg returned unrecognized error %d\n",
625 * xs_tcp_send_request - write an RPC request to a TCP socket
626 * @task: address of RPC task that manages the state of an RPC request
629 * 0: The request has been sent
630 * EAGAIN: The socket was blocked, please call again later to
631 * complete the request
632 * ENOTCONN: Caller needs to invoke connect logic then call again
633 * other: Some other error occurred, the request was not sent
635 * XXX: In the case of soft timeouts, should we eventually give up
636 * if sendmsg is not able to make progress?
638 static int xs_tcp_send_request(struct rpc_task
*task
)
640 struct rpc_rqst
*req
= task
->tk_rqstp
;
641 struct rpc_xprt
*xprt
= req
->rq_xprt
;
642 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
643 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
644 bool zerocopy
= true;
645 bool vm_wait
= false;
649 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
651 xs_pktdump("packet data:",
652 req
->rq_svec
->iov_base
,
653 req
->rq_svec
->iov_len
);
654 /* Don't use zero copy if this is a resend. If the RPC call
655 * completes while the socket holds a reference to the pages,
656 * then we may end up resending corrupted data.
658 if (task
->tk_flags
& RPC_TASK_SENT
)
661 /* Continue transmitting the packet/record. We must be careful
662 * to cope with writespace callbacks arriving _after_ we have
663 * called sendmsg(). */
666 status
= xs_sendpages(transport
->sock
, NULL
, 0, xdr
,
667 req
->rq_bytes_sent
, zerocopy
, &sent
);
669 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
670 xdr
->len
- req
->rq_bytes_sent
, status
);
672 /* If we've sent the entire packet, immediately
673 * reset the count of bytes sent. */
674 req
->rq_bytes_sent
+= sent
;
675 req
->rq_xmit_bytes_sent
+= sent
;
676 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
677 req
->rq_bytes_sent
= 0;
681 WARN_ON_ONCE(sent
== 0 && status
== 0);
683 if (status
== -EAGAIN
) {
685 * Return EAGAIN if we're sure we're hitting the
686 * socket send buffer limits.
688 if (test_bit(SOCK_NOSPACE
, &transport
->sock
->flags
))
691 * Did we hit a memory allocation failure?
697 /* Retry, knowing now that we're below the
698 * socket send buffer limit
712 /* Should we call xs_close() here? */
715 status
= xs_nospace(task
);
725 dprintk("RPC: sendmsg returned unrecognized error %d\n",
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
;
777 static void xs_sock_reset_state_flags(struct rpc_xprt
*xprt
)
779 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
781 clear_bit(XPRT_SOCK_DATA_READY
, &transport
->sock_state
);
784 static void xs_sock_reset_connection_flags(struct rpc_xprt
*xprt
)
786 smp_mb__before_atomic();
787 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
788 clear_bit(XPRT_CLOSING
, &xprt
->state
);
789 xs_sock_reset_state_flags(xprt
);
790 smp_mb__after_atomic();
793 static void xs_sock_mark_closed(struct rpc_xprt
*xprt
)
795 xs_sock_reset_connection_flags(xprt
);
796 /* Mark transport as closed and wake up all pending tasks */
797 xprt_disconnect_done(xprt
);
801 * xs_error_report - callback to handle TCP socket state errors
804 * Note: we don't call sock_error() since there may be a rpc_task
805 * using the socket, and so we don't want to clear sk->sk_err.
807 static void xs_error_report(struct sock
*sk
)
809 struct rpc_xprt
*xprt
;
812 read_lock_bh(&sk
->sk_callback_lock
);
813 if (!(xprt
= xprt_from_sock(sk
)))
819 /* Is this a reset event? */
820 if (sk
->sk_state
== TCP_CLOSE
)
821 xs_sock_mark_closed(xprt
);
822 dprintk("RPC: xs_error_report client %p, error=%d...\n",
824 trace_rpc_socket_error(xprt
, sk
->sk_socket
, err
);
825 xprt_wake_pending_tasks(xprt
, err
);
827 read_unlock_bh(&sk
->sk_callback_lock
);
830 static void xs_reset_transport(struct sock_xprt
*transport
)
832 struct socket
*sock
= transport
->sock
;
833 struct sock
*sk
= transport
->inet
;
834 struct rpc_xprt
*xprt
= &transport
->xprt
;
839 if (atomic_read(&transport
->xprt
.swapper
))
840 sk_clear_memalloc(sk
);
842 kernel_sock_shutdown(sock
, SHUT_RDWR
);
844 mutex_lock(&transport
->recv_mutex
);
845 write_lock_bh(&sk
->sk_callback_lock
);
846 transport
->inet
= NULL
;
847 transport
->sock
= NULL
;
849 sk
->sk_user_data
= NULL
;
851 xs_restore_old_callbacks(transport
, sk
);
852 xprt_clear_connected(xprt
);
853 write_unlock_bh(&sk
->sk_callback_lock
);
854 xs_sock_reset_connection_flags(xprt
);
855 mutex_unlock(&transport
->recv_mutex
);
857 trace_rpc_socket_close(xprt
, sock
);
862 * xs_close - close a socket
865 * This is used when all requests are complete; ie, no DRC state remains
866 * on the server we want to save.
868 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
869 * xs_reset_transport() zeroing the socket from underneath a writer.
871 static void xs_close(struct rpc_xprt
*xprt
)
873 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
875 dprintk("RPC: xs_close xprt %p\n", xprt
);
877 xs_reset_transport(transport
);
878 xprt
->reestablish_timeout
= 0;
880 xprt_disconnect_done(xprt
);
883 static void xs_inject_disconnect(struct rpc_xprt
*xprt
)
885 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
887 xprt_disconnect_done(xprt
);
890 static void xs_xprt_free(struct rpc_xprt
*xprt
)
892 xs_free_peer_addresses(xprt
);
897 * xs_destroy - prepare to shutdown a transport
898 * @xprt: doomed transport
901 static void xs_destroy(struct rpc_xprt
*xprt
)
903 struct sock_xprt
*transport
= container_of(xprt
,
904 struct sock_xprt
, xprt
);
905 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
907 cancel_delayed_work_sync(&transport
->connect_worker
);
909 cancel_work_sync(&transport
->recv_worker
);
911 module_put(THIS_MODULE
);
914 static int xs_local_copy_to_xdr(struct xdr_buf
*xdr
, struct sk_buff
*skb
)
916 struct xdr_skb_reader desc
= {
918 .offset
= sizeof(rpc_fraghdr
),
919 .count
= skb
->len
- sizeof(rpc_fraghdr
),
922 if (xdr_partial_copy_from_skb(xdr
, 0, &desc
, xdr_skb_read_bits
) < 0)
930 * xs_local_data_read_skb
935 * Currently this assumes we can read the whole reply in a single gulp.
937 static void xs_local_data_read_skb(struct rpc_xprt
*xprt
,
941 struct rpc_task
*task
;
942 struct rpc_rqst
*rovr
;
947 repsize
= skb
->len
- sizeof(rpc_fraghdr
);
949 dprintk("RPC: impossible RPC reply size %d\n", repsize
);
953 /* Copy the XID from the skb... */
954 xp
= skb_header_pointer(skb
, sizeof(rpc_fraghdr
), sizeof(_xid
), &_xid
);
958 /* Look up and lock the request corresponding to the given XID */
959 spin_lock_bh(&xprt
->transport_lock
);
960 rovr
= xprt_lookup_rqst(xprt
, *xp
);
963 task
= rovr
->rq_task
;
965 copied
= rovr
->rq_private_buf
.buflen
;
966 if (copied
> repsize
)
969 if (xs_local_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
970 dprintk("RPC: sk_buff copy failed\n");
974 xprt_complete_rqst(task
, copied
);
977 spin_unlock_bh(&xprt
->transport_lock
);
980 static void xs_local_data_receive(struct sock_xprt
*transport
)
986 mutex_lock(&transport
->recv_mutex
);
987 sk
= transport
->inet
;
991 skb
= skb_recv_datagram(sk
, 0, 1, &err
);
993 xs_local_data_read_skb(&transport
->xprt
, sk
, skb
);
994 skb_free_datagram(sk
, skb
);
997 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY
, &transport
->sock_state
))
1001 mutex_unlock(&transport
->recv_mutex
);
1004 static void xs_local_data_receive_workfn(struct work_struct
*work
)
1006 struct sock_xprt
*transport
=
1007 container_of(work
, struct sock_xprt
, recv_worker
);
1008 xs_local_data_receive(transport
);
1012 * xs_udp_data_read_skb - receive callback for UDP sockets
1018 static void xs_udp_data_read_skb(struct rpc_xprt
*xprt
,
1020 struct sk_buff
*skb
)
1022 struct rpc_task
*task
;
1023 struct rpc_rqst
*rovr
;
1024 int repsize
, copied
;
1030 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
1034 /* Copy the XID from the skb... */
1035 xp
= skb_header_pointer(skb
, 0, sizeof(_xid
), &_xid
);
1039 /* Look up and lock the request corresponding to the given XID */
1040 spin_lock_bh(&xprt
->transport_lock
);
1041 rovr
= xprt_lookup_rqst(xprt
, *xp
);
1044 task
= rovr
->rq_task
;
1046 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
1049 /* Suck it into the iovec, verify checksum if not done by hw. */
1050 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
1051 __UDPX_INC_STATS(sk
, UDP_MIB_INERRORS
);
1055 __UDPX_INC_STATS(sk
, UDP_MIB_INDATAGRAMS
);
1057 xprt_adjust_cwnd(xprt
, task
, copied
);
1058 xprt_complete_rqst(task
, copied
);
1061 spin_unlock_bh(&xprt
->transport_lock
);
1064 static void xs_udp_data_receive(struct sock_xprt
*transport
)
1066 struct sk_buff
*skb
;
1070 mutex_lock(&transport
->recv_mutex
);
1071 sk
= transport
->inet
;
1075 skb
= skb_recv_datagram(sk
, 0, 1, &err
);
1077 xs_udp_data_read_skb(&transport
->xprt
, sk
, skb
);
1078 skb_free_datagram(sk
, skb
);
1081 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY
, &transport
->sock_state
))
1085 mutex_unlock(&transport
->recv_mutex
);
1088 static void xs_udp_data_receive_workfn(struct work_struct
*work
)
1090 struct sock_xprt
*transport
=
1091 container_of(work
, struct sock_xprt
, recv_worker
);
1092 xs_udp_data_receive(transport
);
1096 * xs_data_ready - "data ready" callback for UDP sockets
1097 * @sk: socket with data to read
1100 static void xs_data_ready(struct sock
*sk
)
1102 struct rpc_xprt
*xprt
;
1104 read_lock_bh(&sk
->sk_callback_lock
);
1105 dprintk("RPC: xs_data_ready...\n");
1106 xprt
= xprt_from_sock(sk
);
1108 struct sock_xprt
*transport
= container_of(xprt
,
1109 struct sock_xprt
, xprt
);
1110 transport
->old_data_ready(sk
);
1111 /* Any data means we had a useful conversation, so
1112 * then we don't need to delay the next reconnect
1114 if (xprt
->reestablish_timeout
)
1115 xprt
->reestablish_timeout
= 0;
1116 if (!test_and_set_bit(XPRT_SOCK_DATA_READY
, &transport
->sock_state
))
1117 queue_work(xprtiod_workqueue
, &transport
->recv_worker
);
1119 read_unlock_bh(&sk
->sk_callback_lock
);
1123 * Helper function to force a TCP close if the server is sending
1124 * junk and/or it has put us in CLOSE_WAIT
1126 static void xs_tcp_force_close(struct rpc_xprt
*xprt
)
1128 xprt_force_disconnect(xprt
);
1131 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
1133 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1137 p
= ((char *) &transport
->tcp_fraghdr
) + transport
->tcp_offset
;
1138 len
= sizeof(transport
->tcp_fraghdr
) - transport
->tcp_offset
;
1139 used
= xdr_skb_read_bits(desc
, p
, len
);
1140 transport
->tcp_offset
+= used
;
1144 transport
->tcp_reclen
= ntohl(transport
->tcp_fraghdr
);
1145 if (transport
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
1146 transport
->tcp_flags
|= TCP_RCV_LAST_FRAG
;
1148 transport
->tcp_flags
&= ~TCP_RCV_LAST_FRAG
;
1149 transport
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
1151 transport
->tcp_flags
&= ~TCP_RCV_COPY_FRAGHDR
;
1152 transport
->tcp_offset
= 0;
1154 /* Sanity check of the record length */
1155 if (unlikely(transport
->tcp_reclen
< 8)) {
1156 dprintk("RPC: invalid TCP record fragment length\n");
1157 xs_tcp_force_close(xprt
);
1160 dprintk("RPC: reading TCP record fragment of length %d\n",
1161 transport
->tcp_reclen
);
1164 static void xs_tcp_check_fraghdr(struct sock_xprt
*transport
)
1166 if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1167 transport
->tcp_flags
|= TCP_RCV_COPY_FRAGHDR
;
1168 transport
->tcp_offset
= 0;
1169 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
) {
1170 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1171 transport
->tcp_flags
|= TCP_RCV_COPY_XID
;
1172 transport
->tcp_copied
= 0;
1177 static inline void xs_tcp_read_xid(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1182 len
= sizeof(transport
->tcp_xid
) - transport
->tcp_offset
;
1183 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
1184 p
= ((char *) &transport
->tcp_xid
) + transport
->tcp_offset
;
1185 used
= xdr_skb_read_bits(desc
, p
, len
);
1186 transport
->tcp_offset
+= used
;
1189 transport
->tcp_flags
&= ~TCP_RCV_COPY_XID
;
1190 transport
->tcp_flags
|= TCP_RCV_READ_CALLDIR
;
1191 transport
->tcp_copied
= 4;
1192 dprintk("RPC: reading %s XID %08x\n",
1193 (transport
->tcp_flags
& TCP_RPC_REPLY
) ? "reply for"
1195 ntohl(transport
->tcp_xid
));
1196 xs_tcp_check_fraghdr(transport
);
1199 static inline void xs_tcp_read_calldir(struct sock_xprt
*transport
,
1200 struct xdr_skb_reader
*desc
)
1207 * We want transport->tcp_offset to be 8 at the end of this routine
1208 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1209 * When this function is called for the first time,
1210 * transport->tcp_offset is 4 (after having already read the xid).
1212 offset
= transport
->tcp_offset
- sizeof(transport
->tcp_xid
);
1213 len
= sizeof(transport
->tcp_calldir
) - offset
;
1214 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len
);
1215 p
= ((char *) &transport
->tcp_calldir
) + offset
;
1216 used
= xdr_skb_read_bits(desc
, p
, len
);
1217 transport
->tcp_offset
+= used
;
1220 transport
->tcp_flags
&= ~TCP_RCV_READ_CALLDIR
;
1222 * We don't yet have the XDR buffer, so we will write the calldir
1223 * out after we get the buffer from the 'struct rpc_rqst'
1225 switch (ntohl(transport
->tcp_calldir
)) {
1227 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1228 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1229 transport
->tcp_flags
|= TCP_RPC_REPLY
;
1232 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1233 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1234 transport
->tcp_flags
&= ~TCP_RPC_REPLY
;
1237 dprintk("RPC: invalid request message type\n");
1238 xs_tcp_force_close(&transport
->xprt
);
1240 xs_tcp_check_fraghdr(transport
);
1243 static inline void xs_tcp_read_common(struct rpc_xprt
*xprt
,
1244 struct xdr_skb_reader
*desc
,
1245 struct rpc_rqst
*req
)
1247 struct sock_xprt
*transport
=
1248 container_of(xprt
, struct sock_xprt
, xprt
);
1249 struct xdr_buf
*rcvbuf
;
1253 rcvbuf
= &req
->rq_private_buf
;
1255 if (transport
->tcp_flags
& TCP_RCV_COPY_CALLDIR
) {
1257 * Save the RPC direction in the XDR buffer
1259 memcpy(rcvbuf
->head
[0].iov_base
+ transport
->tcp_copied
,
1260 &transport
->tcp_calldir
,
1261 sizeof(transport
->tcp_calldir
));
1262 transport
->tcp_copied
+= sizeof(transport
->tcp_calldir
);
1263 transport
->tcp_flags
&= ~TCP_RCV_COPY_CALLDIR
;
1267 if (len
> transport
->tcp_reclen
- transport
->tcp_offset
) {
1268 struct xdr_skb_reader my_desc
;
1270 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1271 memcpy(&my_desc
, desc
, sizeof(my_desc
));
1272 my_desc
.count
= len
;
1273 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1274 &my_desc
, xdr_skb_read_bits
);
1278 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1279 desc
, xdr_skb_read_bits
);
1282 transport
->tcp_copied
+= r
;
1283 transport
->tcp_offset
+= r
;
1286 /* Error when copying to the receive buffer,
1287 * usually because we weren't able to allocate
1288 * additional buffer pages. All we can do now
1289 * is turn off TCP_RCV_COPY_DATA, so the request
1290 * will not receive any additional updates,
1292 * Any remaining data from this record will
1295 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1296 dprintk("RPC: XID %08x truncated request\n",
1297 ntohl(transport
->tcp_xid
));
1298 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1299 "tcp_offset = %u, tcp_reclen = %u\n",
1300 xprt
, transport
->tcp_copied
,
1301 transport
->tcp_offset
, transport
->tcp_reclen
);
1305 dprintk("RPC: XID %08x read %Zd bytes\n",
1306 ntohl(transport
->tcp_xid
), r
);
1307 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1308 "tcp_reclen = %u\n", xprt
, transport
->tcp_copied
,
1309 transport
->tcp_offset
, transport
->tcp_reclen
);
1311 if (transport
->tcp_copied
== req
->rq_private_buf
.buflen
)
1312 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1313 else if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1314 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
)
1315 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1320 * Finds the request corresponding to the RPC xid and invokes the common
1321 * tcp read code to read the data.
1323 static inline int xs_tcp_read_reply(struct rpc_xprt
*xprt
,
1324 struct xdr_skb_reader
*desc
)
1326 struct sock_xprt
*transport
=
1327 container_of(xprt
, struct sock_xprt
, xprt
);
1328 struct rpc_rqst
*req
;
1330 dprintk("RPC: read reply XID %08x\n", ntohl(transport
->tcp_xid
));
1332 /* Find and lock the request corresponding to this xid */
1333 spin_lock_bh(&xprt
->transport_lock
);
1334 req
= xprt_lookup_rqst(xprt
, transport
->tcp_xid
);
1336 dprintk("RPC: XID %08x request not found!\n",
1337 ntohl(transport
->tcp_xid
));
1338 spin_unlock_bh(&xprt
->transport_lock
);
1342 xs_tcp_read_common(xprt
, desc
, req
);
1344 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1345 xprt_complete_rqst(req
->rq_task
, transport
->tcp_copied
);
1347 spin_unlock_bh(&xprt
->transport_lock
);
1351 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1353 * Obtains an rpc_rqst previously allocated and invokes the common
1354 * tcp read code to read the data. The result is placed in the callback
1356 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1357 * connection and return -1.
1359 static int xs_tcp_read_callback(struct rpc_xprt
*xprt
,
1360 struct xdr_skb_reader
*desc
)
1362 struct sock_xprt
*transport
=
1363 container_of(xprt
, struct sock_xprt
, xprt
);
1364 struct rpc_rqst
*req
;
1366 /* Look up and lock the request corresponding to the given XID */
1367 spin_lock_bh(&xprt
->transport_lock
);
1368 req
= xprt_lookup_bc_request(xprt
, transport
->tcp_xid
);
1370 spin_unlock_bh(&xprt
->transport_lock
);
1371 printk(KERN_WARNING
"Callback slot table overflowed\n");
1372 xprt_force_disconnect(xprt
);
1376 dprintk("RPC: read callback XID %08x\n", ntohl(req
->rq_xid
));
1377 xs_tcp_read_common(xprt
, desc
, req
);
1379 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1380 xprt_complete_bc_request(req
, transport
->tcp_copied
);
1381 spin_unlock_bh(&xprt
->transport_lock
);
1386 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1387 struct xdr_skb_reader
*desc
)
1389 struct sock_xprt
*transport
=
1390 container_of(xprt
, struct sock_xprt
, xprt
);
1392 return (transport
->tcp_flags
& TCP_RPC_REPLY
) ?
1393 xs_tcp_read_reply(xprt
, desc
) :
1394 xs_tcp_read_callback(xprt
, desc
);
1397 static int xs_tcp_bc_up(struct svc_serv
*serv
, struct net
*net
)
1401 ret
= svc_create_xprt(serv
, "tcp-bc", net
, PF_INET
, 0,
1402 SVC_SOCK_ANONYMOUS
);
1408 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt
*xprt
)
1413 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1414 struct xdr_skb_reader
*desc
)
1416 return xs_tcp_read_reply(xprt
, desc
);
1418 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1421 * Read data off the transport. This can be either an RPC_CALL or an
1422 * RPC_REPLY. Relay the processing to helper functions.
1424 static void xs_tcp_read_data(struct rpc_xprt
*xprt
,
1425 struct xdr_skb_reader
*desc
)
1427 struct sock_xprt
*transport
=
1428 container_of(xprt
, struct sock_xprt
, xprt
);
1430 if (_xs_tcp_read_data(xprt
, desc
) == 0)
1431 xs_tcp_check_fraghdr(transport
);
1434 * The transport_lock protects the request handling.
1435 * There's no need to hold it to update the tcp_flags.
1437 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1441 static inline void xs_tcp_read_discard(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1445 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1446 if (len
> desc
->count
)
1449 desc
->offset
+= len
;
1450 transport
->tcp_offset
+= len
;
1451 dprintk("RPC: discarded %Zu bytes\n", len
);
1452 xs_tcp_check_fraghdr(transport
);
1455 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
1457 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
1458 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1459 struct xdr_skb_reader desc
= {
1465 dprintk("RPC: xs_tcp_data_recv started\n");
1467 trace_xs_tcp_data_recv(transport
);
1468 /* Read in a new fragment marker if necessary */
1469 /* Can we ever really expect to get completely empty fragments? */
1470 if (transport
->tcp_flags
& TCP_RCV_COPY_FRAGHDR
) {
1471 xs_tcp_read_fraghdr(xprt
, &desc
);
1474 /* Read in the xid if necessary */
1475 if (transport
->tcp_flags
& TCP_RCV_COPY_XID
) {
1476 xs_tcp_read_xid(transport
, &desc
);
1479 /* Read in the call/reply flag */
1480 if (transport
->tcp_flags
& TCP_RCV_READ_CALLDIR
) {
1481 xs_tcp_read_calldir(transport
, &desc
);
1484 /* Read in the request data */
1485 if (transport
->tcp_flags
& TCP_RCV_COPY_DATA
) {
1486 xs_tcp_read_data(xprt
, &desc
);
1489 /* Skip over any trailing bytes on short reads */
1490 xs_tcp_read_discard(transport
, &desc
);
1491 } while (desc
.count
);
1492 trace_xs_tcp_data_recv(transport
);
1493 dprintk("RPC: xs_tcp_data_recv done\n");
1494 return len
- desc
.count
;
1497 static void xs_tcp_data_receive(struct sock_xprt
*transport
)
1499 struct rpc_xprt
*xprt
= &transport
->xprt
;
1501 read_descriptor_t rd_desc
= {
1502 .count
= 2*1024*1024,
1505 unsigned long total
= 0;
1508 mutex_lock(&transport
->recv_mutex
);
1509 sk
= transport
->inet
;
1513 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1516 read
= tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
1518 clear_bit(XPRT_SOCK_DATA_READY
, &transport
->sock_state
);
1520 if (!test_bit(XPRT_SOCK_DATA_READY
, &transport
->sock_state
))
1526 rd_desc
.count
= 65536;
1529 mutex_unlock(&transport
->recv_mutex
);
1530 trace_xs_tcp_data_ready(xprt
, read
, total
);
1533 static void xs_tcp_data_receive_workfn(struct work_struct
*work
)
1535 struct sock_xprt
*transport
=
1536 container_of(work
, struct sock_xprt
, recv_worker
);
1537 xs_tcp_data_receive(transport
);
1541 * xs_tcp_state_change - callback to handle TCP socket state changes
1542 * @sk: socket whose state has changed
1545 static void xs_tcp_state_change(struct sock
*sk
)
1547 struct rpc_xprt
*xprt
;
1548 struct sock_xprt
*transport
;
1550 read_lock_bh(&sk
->sk_callback_lock
);
1551 if (!(xprt
= xprt_from_sock(sk
)))
1553 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
1554 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1555 sk
->sk_state
, xprt_connected(xprt
),
1556 sock_flag(sk
, SOCK_DEAD
),
1557 sock_flag(sk
, SOCK_ZAPPED
),
1560 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1561 trace_rpc_socket_state_change(xprt
, sk
->sk_socket
);
1562 switch (sk
->sk_state
) {
1563 case TCP_ESTABLISHED
:
1564 spin_lock(&xprt
->transport_lock
);
1565 if (!xprt_test_and_set_connected(xprt
)) {
1567 /* Reset TCP record info */
1568 transport
->tcp_offset
= 0;
1569 transport
->tcp_reclen
= 0;
1570 transport
->tcp_copied
= 0;
1571 transport
->tcp_flags
=
1572 TCP_RCV_COPY_FRAGHDR
| TCP_RCV_COPY_XID
;
1573 xprt
->connect_cookie
++;
1574 clear_bit(XPRT_SOCK_CONNECTING
, &transport
->sock_state
);
1575 xprt_clear_connecting(xprt
);
1577 xprt_wake_pending_tasks(xprt
, -EAGAIN
);
1579 spin_unlock(&xprt
->transport_lock
);
1582 /* The client initiated a shutdown of the socket */
1583 xprt
->connect_cookie
++;
1584 xprt
->reestablish_timeout
= 0;
1585 set_bit(XPRT_CLOSING
, &xprt
->state
);
1586 smp_mb__before_atomic();
1587 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1588 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1589 smp_mb__after_atomic();
1591 case TCP_CLOSE_WAIT
:
1592 /* The server initiated a shutdown of the socket */
1593 xprt
->connect_cookie
++;
1594 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1595 xs_tcp_force_close(xprt
);
1598 * If the server closed down the connection, make sure that
1599 * we back off before reconnecting
1601 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
1602 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1605 set_bit(XPRT_CLOSING
, &xprt
->state
);
1606 smp_mb__before_atomic();
1607 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1608 smp_mb__after_atomic();
1611 if (test_and_clear_bit(XPRT_SOCK_CONNECTING
,
1612 &transport
->sock_state
))
1613 xprt_clear_connecting(xprt
);
1614 xs_sock_mark_closed(xprt
);
1617 read_unlock_bh(&sk
->sk_callback_lock
);
1620 static void xs_write_space(struct sock
*sk
)
1622 struct socket_wq
*wq
;
1623 struct rpc_xprt
*xprt
;
1627 clear_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1629 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1632 wq
= rcu_dereference(sk
->sk_wq
);
1633 if (!wq
|| test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE
, &wq
->flags
) == 0)
1636 xprt_write_space(xprt
);
1642 * xs_udp_write_space - callback invoked when socket buffer space
1644 * @sk: socket whose state has changed
1646 * Called when more output buffer space is available for this socket.
1647 * We try not to wake our writers until they can make "significant"
1648 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1649 * with a bunch of small requests.
1651 static void xs_udp_write_space(struct sock
*sk
)
1653 read_lock_bh(&sk
->sk_callback_lock
);
1655 /* from net/core/sock.c:sock_def_write_space */
1656 if (sock_writeable(sk
))
1659 read_unlock_bh(&sk
->sk_callback_lock
);
1663 * xs_tcp_write_space - callback invoked when socket buffer space
1665 * @sk: socket whose state has changed
1667 * Called when more output buffer space is available for this socket.
1668 * We try not to wake our writers until they can make "significant"
1669 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1670 * with a bunch of small requests.
1672 static void xs_tcp_write_space(struct sock
*sk
)
1674 read_lock_bh(&sk
->sk_callback_lock
);
1676 /* from net/core/stream.c:sk_stream_write_space */
1677 if (sk_stream_is_writeable(sk
))
1680 read_unlock_bh(&sk
->sk_callback_lock
);
1683 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1685 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1686 struct sock
*sk
= transport
->inet
;
1688 if (transport
->rcvsize
) {
1689 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1690 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1692 if (transport
->sndsize
) {
1693 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1694 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1695 sk
->sk_write_space(sk
);
1700 * xs_udp_set_buffer_size - set send and receive limits
1701 * @xprt: generic transport
1702 * @sndsize: requested size of send buffer, in bytes
1703 * @rcvsize: requested size of receive buffer, in bytes
1705 * Set socket send and receive buffer size limits.
1707 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1709 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1711 transport
->sndsize
= 0;
1713 transport
->sndsize
= sndsize
+ 1024;
1714 transport
->rcvsize
= 0;
1716 transport
->rcvsize
= rcvsize
+ 1024;
1718 xs_udp_do_set_buffer_size(xprt
);
1722 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1723 * @task: task that timed out
1725 * Adjust the congestion window after a retransmit timeout has occurred.
1727 static void xs_udp_timer(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1729 xprt_adjust_cwnd(xprt
, task
, -ETIMEDOUT
);
1732 static unsigned short xs_get_random_port(void)
1734 unsigned short range
= xprt_max_resvport
- xprt_min_resvport
+ 1;
1735 unsigned short rand
= (unsigned short) prandom_u32() % range
;
1736 return rand
+ xprt_min_resvport
;
1740 * xs_set_reuseaddr_port - set the socket's port and address reuse options
1743 * Note that this function has to be called on all sockets that share the
1744 * same port, and it must be called before binding.
1746 static void xs_sock_set_reuseport(struct socket
*sock
)
1750 kernel_setsockopt(sock
, SOL_SOCKET
, SO_REUSEPORT
,
1751 (char *)&opt
, sizeof(opt
));
1754 static unsigned short xs_sock_getport(struct socket
*sock
)
1756 struct sockaddr_storage buf
;
1758 unsigned short port
= 0;
1760 if (kernel_getsockname(sock
, (struct sockaddr
*)&buf
, &buflen
) < 0)
1762 switch (buf
.ss_family
) {
1764 port
= ntohs(((struct sockaddr_in6
*)&buf
)->sin6_port
);
1767 port
= ntohs(((struct sockaddr_in
*)&buf
)->sin_port
);
1774 * xs_set_port - reset the port number in the remote endpoint address
1775 * @xprt: generic transport
1776 * @port: new port number
1779 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1781 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1783 rpc_set_port(xs_addr(xprt
), port
);
1784 xs_update_peer_port(xprt
);
1787 static void xs_set_srcport(struct sock_xprt
*transport
, struct socket
*sock
)
1789 if (transport
->srcport
== 0)
1790 transport
->srcport
= xs_sock_getport(sock
);
1793 static unsigned short xs_get_srcport(struct sock_xprt
*transport
)
1795 unsigned short port
= transport
->srcport
;
1797 if (port
== 0 && transport
->xprt
.resvport
)
1798 port
= xs_get_random_port();
1802 static unsigned short xs_next_srcport(struct sock_xprt
*transport
, unsigned short port
)
1804 if (transport
->srcport
!= 0)
1805 transport
->srcport
= 0;
1806 if (!transport
->xprt
.resvport
)
1808 if (port
<= xprt_min_resvport
|| port
> xprt_max_resvport
)
1809 return xprt_max_resvport
;
1812 static int xs_bind(struct sock_xprt
*transport
, struct socket
*sock
)
1814 struct sockaddr_storage myaddr
;
1816 unsigned short port
= xs_get_srcport(transport
);
1817 unsigned short last
;
1820 * If we are asking for any ephemeral port (i.e. port == 0 &&
1821 * transport->xprt.resvport == 0), don't bind. Let the local
1822 * port selection happen implicitly when the socket is used
1823 * (for example at connect time).
1825 * This ensures that we can continue to establish TCP
1826 * connections even when all local ephemeral ports are already
1827 * a part of some TCP connection. This makes no difference
1828 * for UDP sockets, but also doens't harm them.
1830 * If we're asking for any reserved port (i.e. port == 0 &&
1831 * transport->xprt.resvport == 1) xs_get_srcport above will
1832 * ensure that port is non-zero and we will bind as needed.
1837 memcpy(&myaddr
, &transport
->srcaddr
, transport
->xprt
.addrlen
);
1839 rpc_set_port((struct sockaddr
*)&myaddr
, port
);
1840 err
= kernel_bind(sock
, (struct sockaddr
*)&myaddr
,
1841 transport
->xprt
.addrlen
);
1843 transport
->srcport
= port
;
1847 port
= xs_next_srcport(transport
, port
);
1850 } while (err
== -EADDRINUSE
&& nloop
!= 2);
1852 if (myaddr
.ss_family
== AF_INET
)
1853 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__
,
1854 &((struct sockaddr_in
*)&myaddr
)->sin_addr
,
1855 port
, err
? "failed" : "ok", err
);
1857 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__
,
1858 &((struct sockaddr_in6
*)&myaddr
)->sin6_addr
,
1859 port
, err
? "failed" : "ok", err
);
1864 * We don't support autobind on AF_LOCAL sockets
1866 static void xs_local_rpcbind(struct rpc_task
*task
)
1868 xprt_set_bound(task
->tk_xprt
);
1871 static void xs_local_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1875 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1876 static struct lock_class_key xs_key
[2];
1877 static struct lock_class_key xs_slock_key
[2];
1879 static inline void xs_reclassify_socketu(struct socket
*sock
)
1881 struct sock
*sk
= sock
->sk
;
1883 sock_lock_init_class_and_name(sk
, "slock-AF_LOCAL-RPC",
1884 &xs_slock_key
[1], "sk_lock-AF_LOCAL-RPC", &xs_key
[1]);
1887 static inline void xs_reclassify_socket4(struct socket
*sock
)
1889 struct sock
*sk
= sock
->sk
;
1891 sock_lock_init_class_and_name(sk
, "slock-AF_INET-RPC",
1892 &xs_slock_key
[0], "sk_lock-AF_INET-RPC", &xs_key
[0]);
1895 static inline void xs_reclassify_socket6(struct socket
*sock
)
1897 struct sock
*sk
= sock
->sk
;
1899 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-RPC",
1900 &xs_slock_key
[1], "sk_lock-AF_INET6-RPC", &xs_key
[1]);
1903 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1905 if (WARN_ON_ONCE(!sock_allow_reclassification(sock
->sk
)))
1910 xs_reclassify_socketu(sock
);
1913 xs_reclassify_socket4(sock
);
1916 xs_reclassify_socket6(sock
);
1921 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1926 static void xs_dummy_setup_socket(struct work_struct
*work
)
1930 static struct socket
*xs_create_sock(struct rpc_xprt
*xprt
,
1931 struct sock_xprt
*transport
, int family
, int type
,
1932 int protocol
, bool reuseport
)
1934 struct socket
*sock
;
1937 err
= __sock_create(xprt
->xprt_net
, family
, type
, protocol
, &sock
, 1);
1939 dprintk("RPC: can't create %d transport socket (%d).\n",
1943 xs_reclassify_socket(family
, sock
);
1946 xs_sock_set_reuseport(sock
);
1948 err
= xs_bind(transport
, sock
);
1956 return ERR_PTR(err
);
1959 static int xs_local_finish_connecting(struct rpc_xprt
*xprt
,
1960 struct socket
*sock
)
1962 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1965 if (!transport
->inet
) {
1966 struct sock
*sk
= sock
->sk
;
1968 write_lock_bh(&sk
->sk_callback_lock
);
1970 xs_save_old_callbacks(transport
, sk
);
1972 sk
->sk_user_data
= xprt
;
1973 sk
->sk_data_ready
= xs_data_ready
;
1974 sk
->sk_write_space
= xs_udp_write_space
;
1975 sock_set_flag(sk
, SOCK_FASYNC
);
1976 sk
->sk_error_report
= xs_error_report
;
1977 sk
->sk_allocation
= GFP_NOIO
;
1979 xprt_clear_connected(xprt
);
1981 /* Reset to new socket */
1982 transport
->sock
= sock
;
1983 transport
->inet
= sk
;
1985 write_unlock_bh(&sk
->sk_callback_lock
);
1988 /* Tell the socket layer to start connecting... */
1989 xprt
->stat
.connect_count
++;
1990 xprt
->stat
.connect_start
= jiffies
;
1991 return kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, 0);
1995 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1996 * @transport: socket transport to connect
1998 static int xs_local_setup_socket(struct sock_xprt
*transport
)
2000 struct rpc_xprt
*xprt
= &transport
->xprt
;
2001 struct socket
*sock
;
2004 status
= __sock_create(xprt
->xprt_net
, AF_LOCAL
,
2005 SOCK_STREAM
, 0, &sock
, 1);
2007 dprintk("RPC: can't create AF_LOCAL "
2008 "transport socket (%d).\n", -status
);
2011 xs_reclassify_socket(AF_LOCAL
, sock
);
2013 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
2014 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2016 status
= xs_local_finish_connecting(xprt
, sock
);
2017 trace_rpc_socket_connect(xprt
, sock
, status
);
2020 dprintk("RPC: xprt %p connected to %s\n",
2021 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2022 xprt_set_connected(xprt
);
2026 dprintk("RPC: xprt %p: socket %s does not exist\n",
2027 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2030 dprintk("RPC: xprt %p: connection refused for %s\n",
2031 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2034 printk(KERN_ERR
"%s: unhandled error (%d) connecting to %s\n",
2036 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2040 xprt_clear_connecting(xprt
);
2041 xprt_wake_pending_tasks(xprt
, status
);
2045 static void xs_local_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
2047 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2050 if (RPC_IS_ASYNC(task
)) {
2052 * We want the AF_LOCAL connect to be resolved in the
2053 * filesystem namespace of the process making the rpc
2054 * call. Thus we connect synchronously.
2056 * If we want to support asynchronous AF_LOCAL calls,
2057 * we'll need to figure out how to pass a namespace to
2060 rpc_exit(task
, -ENOTCONN
);
2063 ret
= xs_local_setup_socket(transport
);
2064 if (ret
&& !RPC_IS_SOFTCONN(task
))
2065 msleep_interruptible(15000);
2068 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2070 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
2071 * know that we have exclusive access to the socket), to guard against
2072 * races with xs_reset_transport.
2074 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2076 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
2080 * If there's no sock, then we have nothing to set. The
2081 * reconnecting process will get it for us.
2083 if (!transport
->inet
)
2085 if (atomic_read(&xprt
->swapper
))
2086 sk_set_memalloc(transport
->inet
);
2090 * xs_enable_swap - Tag this transport as being used for swap.
2091 * @xprt: transport to tag
2093 * Take a reference to this transport on behalf of the rpc_clnt, and
2094 * optionally mark it for swapping if it wasn't already.
2097 xs_enable_swap(struct rpc_xprt
*xprt
)
2099 struct sock_xprt
*xs
= container_of(xprt
, struct sock_xprt
, xprt
);
2101 if (atomic_inc_return(&xprt
->swapper
) != 1)
2103 if (wait_on_bit_lock(&xprt
->state
, XPRT_LOCKED
, TASK_KILLABLE
))
2104 return -ERESTARTSYS
;
2106 sk_set_memalloc(xs
->inet
);
2107 xprt_release_xprt(xprt
, NULL
);
2112 * xs_disable_swap - Untag this transport as being used for swap.
2113 * @xprt: transport to tag
2115 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2116 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2119 xs_disable_swap(struct rpc_xprt
*xprt
)
2121 struct sock_xprt
*xs
= container_of(xprt
, struct sock_xprt
, xprt
);
2123 if (!atomic_dec_and_test(&xprt
->swapper
))
2125 if (wait_on_bit_lock(&xprt
->state
, XPRT_LOCKED
, TASK_KILLABLE
))
2128 sk_clear_memalloc(xs
->inet
);
2129 xprt_release_xprt(xprt
, NULL
);
2132 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2137 xs_enable_swap(struct rpc_xprt
*xprt
)
2143 xs_disable_swap(struct rpc_xprt
*xprt
)
2148 static void xs_udp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2150 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2152 if (!transport
->inet
) {
2153 struct sock
*sk
= sock
->sk
;
2155 write_lock_bh(&sk
->sk_callback_lock
);
2157 xs_save_old_callbacks(transport
, sk
);
2159 sk
->sk_user_data
= xprt
;
2160 sk
->sk_data_ready
= xs_data_ready
;
2161 sk
->sk_write_space
= xs_udp_write_space
;
2162 sock_set_flag(sk
, SOCK_FASYNC
);
2163 sk
->sk_allocation
= GFP_NOIO
;
2165 xprt_set_connected(xprt
);
2167 /* Reset to new socket */
2168 transport
->sock
= sock
;
2169 transport
->inet
= sk
;
2171 xs_set_memalloc(xprt
);
2173 write_unlock_bh(&sk
->sk_callback_lock
);
2175 xs_udp_do_set_buffer_size(xprt
);
2178 static void xs_udp_setup_socket(struct work_struct
*work
)
2180 struct sock_xprt
*transport
=
2181 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2182 struct rpc_xprt
*xprt
= &transport
->xprt
;
2183 struct socket
*sock
= transport
->sock
;
2186 sock
= xs_create_sock(xprt
, transport
,
2187 xs_addr(xprt
)->sa_family
, SOCK_DGRAM
,
2188 IPPROTO_UDP
, false);
2192 dprintk("RPC: worker connecting xprt %p via %s to "
2193 "%s (port %s)\n", xprt
,
2194 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2195 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2196 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2198 xs_udp_finish_connecting(xprt
, sock
);
2199 trace_rpc_socket_connect(xprt
, sock
, 0);
2202 xprt_unlock_connect(xprt
, transport
);
2203 xprt_clear_connecting(xprt
);
2204 xprt_wake_pending_tasks(xprt
, status
);
2208 * xs_tcp_shutdown - gracefully shut down a TCP socket
2211 * Initiates a graceful shutdown of the TCP socket by calling the
2212 * equivalent of shutdown(SHUT_RDWR);
2214 static void xs_tcp_shutdown(struct rpc_xprt
*xprt
)
2216 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2217 struct socket
*sock
= transport
->sock
;
2221 if (xprt_connected(xprt
)) {
2222 kernel_sock_shutdown(sock
, SHUT_RDWR
);
2223 trace_rpc_socket_shutdown(xprt
, sock
);
2225 xs_reset_transport(transport
);
2228 static int xs_tcp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2230 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2231 int ret
= -ENOTCONN
;
2233 if (!transport
->inet
) {
2234 struct sock
*sk
= sock
->sk
;
2235 unsigned int keepidle
= xprt
->timeout
->to_initval
/ HZ
;
2236 unsigned int keepcnt
= xprt
->timeout
->to_retries
+ 1;
2237 unsigned int opt_on
= 1;
2240 /* TCP Keepalive options */
2241 kernel_setsockopt(sock
, SOL_SOCKET
, SO_KEEPALIVE
,
2242 (char *)&opt_on
, sizeof(opt_on
));
2243 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPIDLE
,
2244 (char *)&keepidle
, sizeof(keepidle
));
2245 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPINTVL
,
2246 (char *)&keepidle
, sizeof(keepidle
));
2247 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPCNT
,
2248 (char *)&keepcnt
, sizeof(keepcnt
));
2250 /* TCP user timeout (see RFC5482) */
2251 timeo
= jiffies_to_msecs(xprt
->timeout
->to_initval
) *
2252 (xprt
->timeout
->to_retries
+ 1);
2253 kernel_setsockopt(sock
, SOL_TCP
, TCP_USER_TIMEOUT
,
2254 (char *)&timeo
, sizeof(timeo
));
2256 write_lock_bh(&sk
->sk_callback_lock
);
2258 xs_save_old_callbacks(transport
, sk
);
2260 sk
->sk_user_data
= xprt
;
2261 sk
->sk_data_ready
= xs_data_ready
;
2262 sk
->sk_state_change
= xs_tcp_state_change
;
2263 sk
->sk_write_space
= xs_tcp_write_space
;
2264 sock_set_flag(sk
, SOCK_FASYNC
);
2265 sk
->sk_error_report
= xs_error_report
;
2266 sk
->sk_allocation
= GFP_NOIO
;
2268 /* socket options */
2269 sock_reset_flag(sk
, SOCK_LINGER
);
2270 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
2272 xprt_clear_connected(xprt
);
2274 /* Reset to new socket */
2275 transport
->sock
= sock
;
2276 transport
->inet
= sk
;
2278 write_unlock_bh(&sk
->sk_callback_lock
);
2281 if (!xprt_bound(xprt
))
2284 xs_set_memalloc(xprt
);
2286 /* Tell the socket layer to start connecting... */
2287 xprt
->stat
.connect_count
++;
2288 xprt
->stat
.connect_start
= jiffies
;
2289 set_bit(XPRT_SOCK_CONNECTING
, &transport
->sock_state
);
2290 ret
= kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, O_NONBLOCK
);
2293 xs_set_srcport(transport
, sock
);
2296 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2297 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2304 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2306 * Invoked by a work queue tasklet.
2308 static void xs_tcp_setup_socket(struct work_struct
*work
)
2310 struct sock_xprt
*transport
=
2311 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2312 struct socket
*sock
= transport
->sock
;
2313 struct rpc_xprt
*xprt
= &transport
->xprt
;
2317 sock
= xs_create_sock(xprt
, transport
,
2318 xs_addr(xprt
)->sa_family
, SOCK_STREAM
,
2321 status
= PTR_ERR(sock
);
2326 dprintk("RPC: worker connecting xprt %p via %s to "
2327 "%s (port %s)\n", xprt
,
2328 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2329 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2330 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2332 status
= xs_tcp_finish_connecting(xprt
, sock
);
2333 trace_rpc_socket_connect(xprt
, sock
, status
);
2334 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2335 xprt
, -status
, xprt_connected(xprt
),
2336 sock
->sk
->sk_state
);
2339 printk("%s: connect returned unhandled error %d\n",
2341 case -EADDRNOTAVAIL
:
2342 /* We're probably in TIME_WAIT. Get rid of existing socket,
2345 xs_tcp_force_close(xprt
);
2350 xprt_unlock_connect(xprt
, transport
);
2353 /* Happens, for instance, if the user specified a link
2354 * local IPv6 address without a scope-id.
2361 /* retry with existing socket, after a delay */
2362 xs_tcp_force_close(xprt
);
2367 xprt_unlock_connect(xprt
, transport
);
2368 xprt_clear_connecting(xprt
);
2369 xprt_wake_pending_tasks(xprt
, status
);
2373 * xs_connect - connect a socket to a remote endpoint
2374 * @xprt: pointer to transport structure
2375 * @task: address of RPC task that manages state of connect request
2377 * TCP: If the remote end dropped the connection, delay reconnecting.
2379 * UDP socket connects are synchronous, but we use a work queue anyway
2380 * to guarantee that even unprivileged user processes can set up a
2381 * socket on a privileged port.
2383 * If a UDP socket connect fails, the delay behavior here prevents
2384 * retry floods (hard mounts).
2386 static void xs_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
2388 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2390 WARN_ON_ONCE(!xprt_lock_connect(xprt
, task
, transport
));
2392 if (transport
->sock
!= NULL
) {
2393 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2395 xprt
, xprt
->reestablish_timeout
/ HZ
);
2397 /* Start by resetting any existing state */
2398 xs_reset_transport(transport
);
2400 queue_delayed_work(xprtiod_workqueue
,
2401 &transport
->connect_worker
,
2402 xprt
->reestablish_timeout
);
2403 xprt
->reestablish_timeout
<<= 1;
2404 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2405 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2406 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
2407 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
2409 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
2410 queue_delayed_work(xprtiod_workqueue
,
2411 &transport
->connect_worker
, 0);
2416 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2417 * @xprt: rpc_xprt struct containing statistics
2421 static void xs_local_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2425 if (xprt_connected(xprt
))
2426 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2428 seq_printf(seq
, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2429 "%llu %llu %lu %llu %llu\n",
2430 xprt
->stat
.bind_count
,
2431 xprt
->stat
.connect_count
,
2432 xprt
->stat
.connect_time
,
2436 xprt
->stat
.bad_xids
,
2439 xprt
->stat
.max_slots
,
2440 xprt
->stat
.sending_u
,
2441 xprt
->stat
.pending_u
);
2445 * xs_udp_print_stats - display UDP socket-specifc stats
2446 * @xprt: rpc_xprt struct containing statistics
2450 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2452 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2454 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2457 xprt
->stat
.bind_count
,
2460 xprt
->stat
.bad_xids
,
2463 xprt
->stat
.max_slots
,
2464 xprt
->stat
.sending_u
,
2465 xprt
->stat
.pending_u
);
2469 * xs_tcp_print_stats - display TCP socket-specifc stats
2470 * @xprt: rpc_xprt struct containing statistics
2474 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2476 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2479 if (xprt_connected(xprt
))
2480 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2482 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2483 "%llu %llu %lu %llu %llu\n",
2485 xprt
->stat
.bind_count
,
2486 xprt
->stat
.connect_count
,
2487 xprt
->stat
.connect_time
,
2491 xprt
->stat
.bad_xids
,
2494 xprt
->stat
.max_slots
,
2495 xprt
->stat
.sending_u
,
2496 xprt
->stat
.pending_u
);
2500 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2501 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2502 * to use the server side send routines.
2504 static void *bc_malloc(struct rpc_task
*task
, size_t size
)
2507 struct rpc_buffer
*buf
;
2509 WARN_ON_ONCE(size
> PAGE_SIZE
- sizeof(struct rpc_buffer
));
2510 if (size
> PAGE_SIZE
- sizeof(struct rpc_buffer
))
2513 page
= alloc_page(GFP_KERNEL
);
2517 buf
= page_address(page
);
2518 buf
->len
= PAGE_SIZE
;
2524 * Free the space allocated in the bc_alloc routine
2526 static void bc_free(void *buffer
)
2528 struct rpc_buffer
*buf
;
2533 buf
= container_of(buffer
, struct rpc_buffer
, data
);
2534 free_page((unsigned long)buf
);
2538 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2539 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2541 static int bc_sendto(struct rpc_rqst
*req
)
2544 struct xdr_buf
*xbufp
= &req
->rq_snd_buf
;
2545 struct rpc_xprt
*xprt
= req
->rq_xprt
;
2546 struct sock_xprt
*transport
=
2547 container_of(xprt
, struct sock_xprt
, xprt
);
2548 struct socket
*sock
= transport
->sock
;
2549 unsigned long headoff
;
2550 unsigned long tailoff
;
2552 xs_encode_stream_record_marker(xbufp
);
2554 tailoff
= (unsigned long)xbufp
->tail
[0].iov_base
& ~PAGE_MASK
;
2555 headoff
= (unsigned long)xbufp
->head
[0].iov_base
& ~PAGE_MASK
;
2556 len
= svc_send_common(sock
, xbufp
,
2557 virt_to_page(xbufp
->head
[0].iov_base
), headoff
,
2558 xbufp
->tail
[0].iov_base
, tailoff
);
2560 if (len
!= xbufp
->len
) {
2561 printk(KERN_NOTICE
"Error sending entire callback!\n");
2569 * The send routine. Borrows from svc_send
2571 static int bc_send_request(struct rpc_task
*task
)
2573 struct rpc_rqst
*req
= task
->tk_rqstp
;
2574 struct svc_xprt
*xprt
;
2577 dprintk("sending request with xid: %08x\n", ntohl(req
->rq_xid
));
2579 * Get the server socket associated with this callback xprt
2581 xprt
= req
->rq_xprt
->bc_xprt
;
2584 * Grab the mutex to serialize data as the connection is shared
2585 * with the fore channel
2587 if (!mutex_trylock(&xprt
->xpt_mutex
)) {
2588 rpc_sleep_on(&xprt
->xpt_bc_pending
, task
, NULL
);
2589 if (!mutex_trylock(&xprt
->xpt_mutex
))
2591 rpc_wake_up_queued_task(&xprt
->xpt_bc_pending
, task
);
2593 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
))
2596 len
= bc_sendto(req
);
2597 mutex_unlock(&xprt
->xpt_mutex
);
2606 * The close routine. Since this is client initiated, we do nothing
2609 static void bc_close(struct rpc_xprt
*xprt
)
2614 * The xprt destroy routine. Again, because this connection is client
2615 * initiated, we do nothing
2618 static void bc_destroy(struct rpc_xprt
*xprt
)
2620 dprintk("RPC: bc_destroy xprt %p\n", xprt
);
2623 module_put(THIS_MODULE
);
2626 static struct rpc_xprt_ops xs_local_ops
= {
2627 .reserve_xprt
= xprt_reserve_xprt
,
2628 .release_xprt
= xs_tcp_release_xprt
,
2629 .alloc_slot
= xprt_alloc_slot
,
2630 .rpcbind
= xs_local_rpcbind
,
2631 .set_port
= xs_local_set_port
,
2632 .connect
= xs_local_connect
,
2633 .buf_alloc
= rpc_malloc
,
2634 .buf_free
= rpc_free
,
2635 .send_request
= xs_local_send_request
,
2636 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2638 .destroy
= xs_destroy
,
2639 .print_stats
= xs_local_print_stats
,
2640 .enable_swap
= xs_enable_swap
,
2641 .disable_swap
= xs_disable_swap
,
2644 static struct rpc_xprt_ops xs_udp_ops
= {
2645 .set_buffer_size
= xs_udp_set_buffer_size
,
2646 .reserve_xprt
= xprt_reserve_xprt_cong
,
2647 .release_xprt
= xprt_release_xprt_cong
,
2648 .alloc_slot
= xprt_alloc_slot
,
2649 .rpcbind
= rpcb_getport_async
,
2650 .set_port
= xs_set_port
,
2651 .connect
= xs_connect
,
2652 .buf_alloc
= rpc_malloc
,
2653 .buf_free
= rpc_free
,
2654 .send_request
= xs_udp_send_request
,
2655 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
2656 .timer
= xs_udp_timer
,
2657 .release_request
= xprt_release_rqst_cong
,
2659 .destroy
= xs_destroy
,
2660 .print_stats
= xs_udp_print_stats
,
2661 .enable_swap
= xs_enable_swap
,
2662 .disable_swap
= xs_disable_swap
,
2663 .inject_disconnect
= xs_inject_disconnect
,
2666 static struct rpc_xprt_ops xs_tcp_ops
= {
2667 .reserve_xprt
= xprt_reserve_xprt
,
2668 .release_xprt
= xs_tcp_release_xprt
,
2669 .alloc_slot
= xprt_lock_and_alloc_slot
,
2670 .rpcbind
= rpcb_getport_async
,
2671 .set_port
= xs_set_port
,
2672 .connect
= xs_connect
,
2673 .buf_alloc
= rpc_malloc
,
2674 .buf_free
= rpc_free
,
2675 .send_request
= xs_tcp_send_request
,
2676 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2677 .close
= xs_tcp_shutdown
,
2678 .destroy
= xs_destroy
,
2679 .print_stats
= xs_tcp_print_stats
,
2680 .enable_swap
= xs_enable_swap
,
2681 .disable_swap
= xs_disable_swap
,
2682 .inject_disconnect
= xs_inject_disconnect
,
2683 #ifdef CONFIG_SUNRPC_BACKCHANNEL
2684 .bc_setup
= xprt_setup_bc
,
2685 .bc_up
= xs_tcp_bc_up
,
2686 .bc_maxpayload
= xs_tcp_bc_maxpayload
,
2687 .bc_free_rqst
= xprt_free_bc_rqst
,
2688 .bc_destroy
= xprt_destroy_bc
,
2693 * The rpc_xprt_ops for the server backchannel
2696 static struct rpc_xprt_ops bc_tcp_ops
= {
2697 .reserve_xprt
= xprt_reserve_xprt
,
2698 .release_xprt
= xprt_release_xprt
,
2699 .alloc_slot
= xprt_alloc_slot
,
2700 .buf_alloc
= bc_malloc
,
2701 .buf_free
= bc_free
,
2702 .send_request
= bc_send_request
,
2703 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2705 .destroy
= bc_destroy
,
2706 .print_stats
= xs_tcp_print_stats
,
2707 .enable_swap
= xs_enable_swap
,
2708 .disable_swap
= xs_disable_swap
,
2709 .inject_disconnect
= xs_inject_disconnect
,
2712 static int xs_init_anyaddr(const int family
, struct sockaddr
*sap
)
2714 static const struct sockaddr_in sin
= {
2715 .sin_family
= AF_INET
,
2716 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
2718 static const struct sockaddr_in6 sin6
= {
2719 .sin6_family
= AF_INET6
,
2720 .sin6_addr
= IN6ADDR_ANY_INIT
,
2727 memcpy(sap
, &sin
, sizeof(sin
));
2730 memcpy(sap
, &sin6
, sizeof(sin6
));
2733 dprintk("RPC: %s: Bad address family\n", __func__
);
2734 return -EAFNOSUPPORT
;
2739 static struct rpc_xprt
*xs_setup_xprt(struct xprt_create
*args
,
2740 unsigned int slot_table_size
,
2741 unsigned int max_slot_table_size
)
2743 struct rpc_xprt
*xprt
;
2744 struct sock_xprt
*new;
2746 if (args
->addrlen
> sizeof(xprt
->addr
)) {
2747 dprintk("RPC: xs_setup_xprt: address too large\n");
2748 return ERR_PTR(-EBADF
);
2751 xprt
= xprt_alloc(args
->net
, sizeof(*new), slot_table_size
,
2752 max_slot_table_size
);
2754 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2756 return ERR_PTR(-ENOMEM
);
2759 new = container_of(xprt
, struct sock_xprt
, xprt
);
2760 mutex_init(&new->recv_mutex
);
2761 memcpy(&xprt
->addr
, args
->dstaddr
, args
->addrlen
);
2762 xprt
->addrlen
= args
->addrlen
;
2764 memcpy(&new->srcaddr
, args
->srcaddr
, args
->addrlen
);
2767 err
= xs_init_anyaddr(args
->dstaddr
->sa_family
,
2768 (struct sockaddr
*)&new->srcaddr
);
2771 return ERR_PTR(err
);
2778 static const struct rpc_timeout xs_local_default_timeout
= {
2779 .to_initval
= 10 * HZ
,
2780 .to_maxval
= 10 * HZ
,
2785 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2786 * @args: rpc transport creation arguments
2788 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2790 static struct rpc_xprt
*xs_setup_local(struct xprt_create
*args
)
2792 struct sockaddr_un
*sun
= (struct sockaddr_un
*)args
->dstaddr
;
2793 struct sock_xprt
*transport
;
2794 struct rpc_xprt
*xprt
;
2795 struct rpc_xprt
*ret
;
2797 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2798 xprt_max_tcp_slot_table_entries
);
2801 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2804 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2805 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2807 xprt
->bind_timeout
= XS_BIND_TO
;
2808 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2809 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2811 xprt
->ops
= &xs_local_ops
;
2812 xprt
->timeout
= &xs_local_default_timeout
;
2814 INIT_WORK(&transport
->recv_worker
, xs_local_data_receive_workfn
);
2815 INIT_DELAYED_WORK(&transport
->connect_worker
,
2816 xs_dummy_setup_socket
);
2818 switch (sun
->sun_family
) {
2820 if (sun
->sun_path
[0] != '/') {
2821 dprintk("RPC: bad AF_LOCAL address: %s\n",
2823 ret
= ERR_PTR(-EINVAL
);
2826 xprt_set_bound(xprt
);
2827 xs_format_peer_addresses(xprt
, "local", RPCBIND_NETID_LOCAL
);
2828 ret
= ERR_PTR(xs_local_setup_socket(transport
));
2833 ret
= ERR_PTR(-EAFNOSUPPORT
);
2837 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2838 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2840 if (try_module_get(THIS_MODULE
))
2842 ret
= ERR_PTR(-EINVAL
);
2848 static const struct rpc_timeout xs_udp_default_timeout
= {
2849 .to_initval
= 5 * HZ
,
2850 .to_maxval
= 30 * HZ
,
2851 .to_increment
= 5 * HZ
,
2856 * xs_setup_udp - Set up transport to use a UDP socket
2857 * @args: rpc transport creation arguments
2860 static struct rpc_xprt
*xs_setup_udp(struct xprt_create
*args
)
2862 struct sockaddr
*addr
= args
->dstaddr
;
2863 struct rpc_xprt
*xprt
;
2864 struct sock_xprt
*transport
;
2865 struct rpc_xprt
*ret
;
2867 xprt
= xs_setup_xprt(args
, xprt_udp_slot_table_entries
,
2868 xprt_udp_slot_table_entries
);
2871 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2873 xprt
->prot
= IPPROTO_UDP
;
2875 /* XXX: header size can vary due to auth type, IPv6, etc. */
2876 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
2878 xprt
->bind_timeout
= XS_BIND_TO
;
2879 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
2880 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2882 xprt
->ops
= &xs_udp_ops
;
2884 xprt
->timeout
= &xs_udp_default_timeout
;
2886 INIT_WORK(&transport
->recv_worker
, xs_udp_data_receive_workfn
);
2887 INIT_DELAYED_WORK(&transport
->connect_worker
, xs_udp_setup_socket
);
2889 switch (addr
->sa_family
) {
2891 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2892 xprt_set_bound(xprt
);
2894 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP
);
2897 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2898 xprt_set_bound(xprt
);
2900 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP6
);
2903 ret
= ERR_PTR(-EAFNOSUPPORT
);
2907 if (xprt_bound(xprt
))
2908 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2909 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2910 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2911 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2913 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2914 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2915 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2917 if (try_module_get(THIS_MODULE
))
2919 ret
= ERR_PTR(-EINVAL
);
2925 static const struct rpc_timeout xs_tcp_default_timeout
= {
2926 .to_initval
= 60 * HZ
,
2927 .to_maxval
= 60 * HZ
,
2932 * xs_setup_tcp - Set up transport to use a TCP socket
2933 * @args: rpc transport creation arguments
2936 static struct rpc_xprt
*xs_setup_tcp(struct xprt_create
*args
)
2938 struct sockaddr
*addr
= args
->dstaddr
;
2939 struct rpc_xprt
*xprt
;
2940 struct sock_xprt
*transport
;
2941 struct rpc_xprt
*ret
;
2942 unsigned int max_slot_table_size
= xprt_max_tcp_slot_table_entries
;
2944 if (args
->flags
& XPRT_CREATE_INFINITE_SLOTS
)
2945 max_slot_table_size
= RPC_MAX_SLOT_TABLE_LIMIT
;
2947 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2948 max_slot_table_size
);
2951 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2953 xprt
->prot
= IPPROTO_TCP
;
2954 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2955 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2957 xprt
->bind_timeout
= XS_BIND_TO
;
2958 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2959 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2961 xprt
->ops
= &xs_tcp_ops
;
2962 xprt
->timeout
= &xs_tcp_default_timeout
;
2964 INIT_WORK(&transport
->recv_worker
, xs_tcp_data_receive_workfn
);
2965 INIT_DELAYED_WORK(&transport
->connect_worker
, xs_tcp_setup_socket
);
2967 switch (addr
->sa_family
) {
2969 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2970 xprt_set_bound(xprt
);
2972 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP
);
2975 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2976 xprt_set_bound(xprt
);
2978 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP6
);
2981 ret
= ERR_PTR(-EAFNOSUPPORT
);
2985 if (xprt_bound(xprt
))
2986 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2987 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2988 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2989 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2991 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2992 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2993 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2995 if (try_module_get(THIS_MODULE
))
2997 ret
= ERR_PTR(-EINVAL
);
3004 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3005 * @args: rpc transport creation arguments
3008 static struct rpc_xprt
*xs_setup_bc_tcp(struct xprt_create
*args
)
3010 struct sockaddr
*addr
= args
->dstaddr
;
3011 struct rpc_xprt
*xprt
;
3012 struct sock_xprt
*transport
;
3013 struct svc_sock
*bc_sock
;
3014 struct rpc_xprt
*ret
;
3016 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
3017 xprt_tcp_slot_table_entries
);
3020 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
3022 xprt
->prot
= IPPROTO_TCP
;
3023 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
3024 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
3025 xprt
->timeout
= &xs_tcp_default_timeout
;
3028 xprt_set_bound(xprt
);
3029 xprt
->bind_timeout
= 0;
3030 xprt
->reestablish_timeout
= 0;
3031 xprt
->idle_timeout
= 0;
3033 xprt
->ops
= &bc_tcp_ops
;
3035 switch (addr
->sa_family
) {
3037 xs_format_peer_addresses(xprt
, "tcp",
3041 xs_format_peer_addresses(xprt
, "tcp",
3042 RPCBIND_NETID_TCP6
);
3045 ret
= ERR_PTR(-EAFNOSUPPORT
);
3049 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3050 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
3051 xprt
->address_strings
[RPC_DISPLAY_PORT
],
3052 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
3055 * Once we've associated a backchannel xprt with a connection,
3056 * we want to keep it around as long as the connection lasts,
3057 * in case we need to start using it for a backchannel again;
3058 * this reference won't be dropped until bc_xprt is destroyed.
3061 args
->bc_xprt
->xpt_bc_xprt
= xprt
;
3062 xprt
->bc_xprt
= args
->bc_xprt
;
3063 bc_sock
= container_of(args
->bc_xprt
, struct svc_sock
, sk_xprt
);
3064 transport
->sock
= bc_sock
->sk_sock
;
3065 transport
->inet
= bc_sock
->sk_sk
;
3068 * Since we don't want connections for the backchannel, we set
3069 * the xprt status to connected
3071 xprt_set_connected(xprt
);
3073 if (try_module_get(THIS_MODULE
))
3076 args
->bc_xprt
->xpt_bc_xprt
= NULL
;
3077 args
->bc_xprt
->xpt_bc_xps
= NULL
;
3079 ret
= ERR_PTR(-EINVAL
);
3085 static struct xprt_class xs_local_transport
= {
3086 .list
= LIST_HEAD_INIT(xs_local_transport
.list
),
3087 .name
= "named UNIX socket",
3088 .owner
= THIS_MODULE
,
3089 .ident
= XPRT_TRANSPORT_LOCAL
,
3090 .setup
= xs_setup_local
,
3093 static struct xprt_class xs_udp_transport
= {
3094 .list
= LIST_HEAD_INIT(xs_udp_transport
.list
),
3096 .owner
= THIS_MODULE
,
3097 .ident
= XPRT_TRANSPORT_UDP
,
3098 .setup
= xs_setup_udp
,
3101 static struct xprt_class xs_tcp_transport
= {
3102 .list
= LIST_HEAD_INIT(xs_tcp_transport
.list
),
3104 .owner
= THIS_MODULE
,
3105 .ident
= XPRT_TRANSPORT_TCP
,
3106 .setup
= xs_setup_tcp
,
3109 static struct xprt_class xs_bc_tcp_transport
= {
3110 .list
= LIST_HEAD_INIT(xs_bc_tcp_transport
.list
),
3111 .name
= "tcp NFSv4.1 backchannel",
3112 .owner
= THIS_MODULE
,
3113 .ident
= XPRT_TRANSPORT_BC_TCP
,
3114 .setup
= xs_setup_bc_tcp
,
3118 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3121 int init_socket_xprt(void)
3123 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3124 if (!sunrpc_table_header
)
3125 sunrpc_table_header
= register_sysctl_table(sunrpc_table
);
3128 xprt_register_transport(&xs_local_transport
);
3129 xprt_register_transport(&xs_udp_transport
);
3130 xprt_register_transport(&xs_tcp_transport
);
3131 xprt_register_transport(&xs_bc_tcp_transport
);
3137 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3140 void cleanup_socket_xprt(void)
3142 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3143 if (sunrpc_table_header
) {
3144 unregister_sysctl_table(sunrpc_table_header
);
3145 sunrpc_table_header
= NULL
;
3149 xprt_unregister_transport(&xs_local_transport
);
3150 xprt_unregister_transport(&xs_udp_transport
);
3151 xprt_unregister_transport(&xs_tcp_transport
);
3152 xprt_unregister_transport(&xs_bc_tcp_transport
);
3155 static int param_set_uint_minmax(const char *val
,
3156 const struct kernel_param
*kp
,
3157 unsigned int min
, unsigned int max
)
3164 ret
= kstrtouint(val
, 0, &num
);
3165 if (ret
== -EINVAL
|| num
< min
|| num
> max
)
3167 *((unsigned int *)kp
->arg
) = num
;
3171 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
3173 if (kp
->arg
== &xprt_min_resvport
)
3174 return param_set_uint_minmax(val
, kp
,
3177 return param_set_uint_minmax(val
, kp
,
3182 static const struct kernel_param_ops param_ops_portnr
= {
3183 .set
= param_set_portnr
,
3184 .get
= param_get_uint
,
3187 #define param_check_portnr(name, p) \
3188 __param_check(name, p, unsigned int);
3190 module_param_named(min_resvport
, xprt_min_resvport
, portnr
, 0644);
3191 module_param_named(max_resvport
, xprt_max_resvport
, portnr
, 0644);
3193 static int param_set_slot_table_size(const char *val
,
3194 const struct kernel_param
*kp
)
3196 return param_set_uint_minmax(val
, kp
,
3198 RPC_MAX_SLOT_TABLE
);
3201 static const struct kernel_param_ops param_ops_slot_table_size
= {
3202 .set
= param_set_slot_table_size
,
3203 .get
= param_get_uint
,
3206 #define param_check_slot_table_size(name, p) \
3207 __param_check(name, p, unsigned int);
3209 static int param_set_max_slot_table_size(const char *val
,
3210 const struct kernel_param
*kp
)
3212 return param_set_uint_minmax(val
, kp
,
3214 RPC_MAX_SLOT_TABLE_LIMIT
);
3217 static const struct kernel_param_ops param_ops_max_slot_table_size
= {
3218 .set
= param_set_max_slot_table_size
,
3219 .get
= param_get_uint
,
3222 #define param_check_max_slot_table_size(name, p) \
3223 __param_check(name, p, unsigned int);
3225 module_param_named(tcp_slot_table_entries
, xprt_tcp_slot_table_entries
,
3226 slot_table_size
, 0644);
3227 module_param_named(tcp_max_slot_table_entries
, xprt_max_tcp_slot_table_entries
,
3228 max_slot_table_size
, 0644);
3229 module_param_named(udp_slot_table_entries
, xprt_udp_slot_table_entries
,
3230 slot_table_size
, 0644);