1 // SPDX-License-Identifier: GPL-2.0
3 * linux/net/sunrpc/xprtsock.c
5 * Client-side transport implementation for sockets.
7 * TCP callback races fixes (C) 1998 Red Hat
8 * TCP send fixes (C) 1998 Red Hat
9 * TCP NFS related read + write fixes
10 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
12 * Rewrite of larges part of the code in order to stabilize TCP stuff.
13 * Fix behaviour when socket buffer is full.
14 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
16 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
18 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
19 * <gilles.quillard@bull.net>
22 #include <linux/types.h>
23 #include <linux/string.h>
24 #include <linux/slab.h>
25 #include <linux/module.h>
26 #include <linux/capability.h>
27 #include <linux/pagemap.h>
28 #include <linux/errno.h>
29 #include <linux/socket.h>
31 #include <linux/net.h>
34 #include <linux/udp.h>
35 #include <linux/tcp.h>
36 #include <linux/sunrpc/clnt.h>
37 #include <linux/sunrpc/addr.h>
38 #include <linux/sunrpc/sched.h>
39 #include <linux/sunrpc/svcsock.h>
40 #include <linux/sunrpc/xprtsock.h>
41 #include <linux/file.h>
42 #ifdef CONFIG_SUNRPC_BACKCHANNEL
43 #include <linux/sunrpc/bc_xprt.h>
47 #include <net/checksum.h>
50 #include <linux/bvec.h>
51 #include <linux/highmem.h>
52 #include <linux/uio.h>
53 #include <linux/sched/mm.h>
55 #include <trace/events/sunrpc.h>
60 static void xs_close(struct rpc_xprt
*xprt
);
61 static void xs_tcp_set_socket_timeouts(struct rpc_xprt
*xprt
,
67 static unsigned int xprt_udp_slot_table_entries
= RPC_DEF_SLOT_TABLE
;
68 static unsigned int xprt_tcp_slot_table_entries
= RPC_MIN_SLOT_TABLE
;
69 static unsigned int xprt_max_tcp_slot_table_entries
= RPC_MAX_SLOT_TABLE
;
71 static unsigned int xprt_min_resvport
= RPC_DEF_MIN_RESVPORT
;
72 static unsigned int xprt_max_resvport
= RPC_DEF_MAX_RESVPORT
;
74 #define XS_TCP_LINGER_TO (15U * HZ)
75 static unsigned int xs_tcp_fin_timeout __read_mostly
= XS_TCP_LINGER_TO
;
78 * We can register our own files under /proc/sys/sunrpc by
79 * calling register_sysctl_table() again. The files in that
80 * directory become the union of all files registered there.
82 * We simply need to make sure that we don't collide with
83 * someone else's file names!
86 static unsigned int min_slot_table_size
= RPC_MIN_SLOT_TABLE
;
87 static unsigned int max_slot_table_size
= RPC_MAX_SLOT_TABLE
;
88 static unsigned int max_tcp_slot_table_limit
= RPC_MAX_SLOT_TABLE_LIMIT
;
89 static unsigned int xprt_min_resvport_limit
= RPC_MIN_RESVPORT
;
90 static unsigned int xprt_max_resvport_limit
= RPC_MAX_RESVPORT
;
92 static struct ctl_table_header
*sunrpc_table_header
;
94 static struct xprt_class xs_local_transport
;
95 static struct xprt_class xs_udp_transport
;
96 static struct xprt_class xs_tcp_transport
;
97 static struct xprt_class xs_bc_tcp_transport
;
100 * FIXME: changing the UDP slot table size should also resize the UDP
101 * socket buffers for existing UDP transports
103 static struct ctl_table xs_tunables_table
[] = {
105 .procname
= "udp_slot_table_entries",
106 .data
= &xprt_udp_slot_table_entries
,
107 .maxlen
= sizeof(unsigned int),
109 .proc_handler
= proc_dointvec_minmax
,
110 .extra1
= &min_slot_table_size
,
111 .extra2
= &max_slot_table_size
114 .procname
= "tcp_slot_table_entries",
115 .data
= &xprt_tcp_slot_table_entries
,
116 .maxlen
= sizeof(unsigned int),
118 .proc_handler
= proc_dointvec_minmax
,
119 .extra1
= &min_slot_table_size
,
120 .extra2
= &max_slot_table_size
123 .procname
= "tcp_max_slot_table_entries",
124 .data
= &xprt_max_tcp_slot_table_entries
,
125 .maxlen
= sizeof(unsigned int),
127 .proc_handler
= proc_dointvec_minmax
,
128 .extra1
= &min_slot_table_size
,
129 .extra2
= &max_tcp_slot_table_limit
132 .procname
= "min_resvport",
133 .data
= &xprt_min_resvport
,
134 .maxlen
= sizeof(unsigned int),
136 .proc_handler
= proc_dointvec_minmax
,
137 .extra1
= &xprt_min_resvport_limit
,
138 .extra2
= &xprt_max_resvport_limit
141 .procname
= "max_resvport",
142 .data
= &xprt_max_resvport
,
143 .maxlen
= sizeof(unsigned int),
145 .proc_handler
= proc_dointvec_minmax
,
146 .extra1
= &xprt_min_resvport_limit
,
147 .extra2
= &xprt_max_resvport_limit
150 .procname
= "tcp_fin_timeout",
151 .data
= &xs_tcp_fin_timeout
,
152 .maxlen
= sizeof(xs_tcp_fin_timeout
),
154 .proc_handler
= proc_dointvec_jiffies
,
159 static struct ctl_table sunrpc_table
[] = {
161 .procname
= "sunrpc",
163 .child
= xs_tunables_table
169 * Wait duration for a reply from the RPC portmapper.
171 #define XS_BIND_TO (60U * HZ)
174 * Delay if a UDP socket connect error occurs. This is most likely some
175 * kind of resource problem on the local host.
177 #define XS_UDP_REEST_TO (2U * HZ)
180 * The reestablish timeout allows clients to delay for a bit before attempting
181 * to reconnect to a server that just dropped our connection.
183 * We implement an exponential backoff when trying to reestablish a TCP
184 * transport connection with the server. Some servers like to drop a TCP
185 * connection when they are overworked, so we start with a short timeout and
186 * increase over time if the server is down or not responding.
188 #define XS_TCP_INIT_REEST_TO (3U * HZ)
191 * TCP idle timeout; client drops the transport socket if it is idle
192 * for this long. Note that we also timeout UDP sockets to prevent
193 * holding port numbers when there is no RPC traffic.
195 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
197 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
198 # undef RPC_DEBUG_DATA
199 # define RPCDBG_FACILITY RPCDBG_TRANS
202 #ifdef RPC_DEBUG_DATA
203 static void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
205 u8
*buf
= (u8
*) packet
;
208 dprintk("RPC: %s\n", msg
);
209 for (j
= 0; j
< count
&& j
< 128; j
+= 4) {
213 dprintk("0x%04x ", j
);
215 dprintk("%02x%02x%02x%02x ",
216 buf
[j
], buf
[j
+1], buf
[j
+2], buf
[j
+3]);
221 static inline void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
227 static inline struct rpc_xprt
*xprt_from_sock(struct sock
*sk
)
229 return (struct rpc_xprt
*) sk
->sk_user_data
;
232 static inline struct sockaddr
*xs_addr(struct rpc_xprt
*xprt
)
234 return (struct sockaddr
*) &xprt
->addr
;
237 static inline struct sockaddr_un
*xs_addr_un(struct rpc_xprt
*xprt
)
239 return (struct sockaddr_un
*) &xprt
->addr
;
242 static inline struct sockaddr_in
*xs_addr_in(struct rpc_xprt
*xprt
)
244 return (struct sockaddr_in
*) &xprt
->addr
;
247 static inline struct sockaddr_in6
*xs_addr_in6(struct rpc_xprt
*xprt
)
249 return (struct sockaddr_in6
*) &xprt
->addr
;
252 static void xs_format_common_peer_addresses(struct rpc_xprt
*xprt
)
254 struct sockaddr
*sap
= xs_addr(xprt
);
255 struct sockaddr_in6
*sin6
;
256 struct sockaddr_in
*sin
;
257 struct sockaddr_un
*sun
;
260 switch (sap
->sa_family
) {
262 sun
= xs_addr_un(xprt
);
263 strlcpy(buf
, sun
->sun_path
, sizeof(buf
));
264 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
265 kstrdup(buf
, GFP_KERNEL
);
268 (void)rpc_ntop(sap
, buf
, sizeof(buf
));
269 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
270 kstrdup(buf
, GFP_KERNEL
);
271 sin
= xs_addr_in(xprt
);
272 snprintf(buf
, sizeof(buf
), "%08x", ntohl(sin
->sin_addr
.s_addr
));
275 (void)rpc_ntop(sap
, buf
, sizeof(buf
));
276 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
277 kstrdup(buf
, GFP_KERNEL
);
278 sin6
= xs_addr_in6(xprt
);
279 snprintf(buf
, sizeof(buf
), "%pi6", &sin6
->sin6_addr
);
285 xprt
->address_strings
[RPC_DISPLAY_HEX_ADDR
] = kstrdup(buf
, GFP_KERNEL
);
288 static void xs_format_common_peer_ports(struct rpc_xprt
*xprt
)
290 struct sockaddr
*sap
= xs_addr(xprt
);
293 snprintf(buf
, sizeof(buf
), "%u", rpc_get_port(sap
));
294 xprt
->address_strings
[RPC_DISPLAY_PORT
] = kstrdup(buf
, GFP_KERNEL
);
296 snprintf(buf
, sizeof(buf
), "%4hx", rpc_get_port(sap
));
297 xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
] = kstrdup(buf
, GFP_KERNEL
);
300 static void xs_format_peer_addresses(struct rpc_xprt
*xprt
,
301 const char *protocol
,
304 xprt
->address_strings
[RPC_DISPLAY_PROTO
] = protocol
;
305 xprt
->address_strings
[RPC_DISPLAY_NETID
] = netid
;
306 xs_format_common_peer_addresses(xprt
);
307 xs_format_common_peer_ports(xprt
);
310 static void xs_update_peer_port(struct rpc_xprt
*xprt
)
312 kfree(xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
]);
313 kfree(xprt
->address_strings
[RPC_DISPLAY_PORT
]);
315 xs_format_common_peer_ports(xprt
);
318 static void xs_free_peer_addresses(struct rpc_xprt
*xprt
)
322 for (i
= 0; i
< RPC_DISPLAY_MAX
; i
++)
324 case RPC_DISPLAY_PROTO
:
325 case RPC_DISPLAY_NETID
:
328 kfree(xprt
->address_strings
[i
]);
333 xs_alloc_sparse_pages(struct xdr_buf
*buf
, size_t want
, gfp_t gfp
)
337 if (!want
|| !(buf
->flags
& XDRBUF_SPARSE_PAGES
))
339 n
= (buf
->page_base
+ want
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
340 for (i
= 0; i
< n
; i
++) {
343 buf
->bvec
[i
].bv_page
= buf
->pages
[i
] = alloc_page(gfp
);
344 if (!buf
->pages
[i
]) {
346 return i
> buf
->page_base
? i
- buf
->page_base
: 0;
353 xs_sock_recvmsg(struct socket
*sock
, struct msghdr
*msg
, int flags
, size_t seek
)
357 iov_iter_advance(&msg
->msg_iter
, seek
);
358 ret
= sock_recvmsg(sock
, msg
, flags
);
359 return ret
> 0 ? ret
+ seek
: ret
;
363 xs_read_kvec(struct socket
*sock
, struct msghdr
*msg
, int flags
,
364 struct kvec
*kvec
, size_t count
, size_t seek
)
366 iov_iter_kvec(&msg
->msg_iter
, READ
, kvec
, 1, count
);
367 return xs_sock_recvmsg(sock
, msg
, flags
, seek
);
371 xs_read_bvec(struct socket
*sock
, struct msghdr
*msg
, int flags
,
372 struct bio_vec
*bvec
, unsigned long nr
, size_t count
,
375 iov_iter_bvec(&msg
->msg_iter
, READ
, bvec
, nr
, count
);
376 return xs_sock_recvmsg(sock
, msg
, flags
, seek
);
380 xs_read_discard(struct socket
*sock
, struct msghdr
*msg
, int flags
,
383 iov_iter_discard(&msg
->msg_iter
, READ
, count
);
384 return sock_recvmsg(sock
, msg
, flags
);
387 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
389 xs_flush_bvec(const struct bio_vec
*bvec
, size_t count
, size_t seek
)
391 struct bvec_iter bi
= {
396 bvec_iter_advance(bvec
, &bi
, seek
& PAGE_MASK
);
397 for_each_bvec(bv
, bvec
, bi
, bi
)
398 flush_dcache_page(bv
.bv_page
);
402 xs_flush_bvec(const struct bio_vec
*bvec
, size_t count
, size_t seek
)
408 xs_read_xdr_buf(struct socket
*sock
, struct msghdr
*msg
, int flags
,
409 struct xdr_buf
*buf
, size_t count
, size_t seek
, size_t *read
)
411 size_t want
, seek_init
= seek
, offset
= 0;
414 want
= min_t(size_t, count
, buf
->head
[0].iov_len
);
416 ret
= xs_read_kvec(sock
, msg
, flags
, &buf
->head
[0], want
, seek
);
420 if (offset
== count
|| msg
->msg_flags
& (MSG_EOR
|MSG_TRUNC
))
430 want
= xs_alloc_sparse_pages(buf
,
431 min_t(size_t, count
- offset
, buf
->page_len
),
434 ret
= xs_read_bvec(sock
, msg
, flags
, buf
->bvec
,
435 xdr_buf_pagecount(buf
),
436 want
+ buf
->page_base
,
437 seek
+ buf
->page_base
);
440 xs_flush_bvec(buf
->bvec
, ret
, seek
+ buf
->page_base
);
441 ret
-= buf
->page_base
;
443 if (offset
== count
|| msg
->msg_flags
& (MSG_EOR
|MSG_TRUNC
))
453 want
= min_t(size_t, count
- offset
, buf
->tail
[0].iov_len
);
455 ret
= xs_read_kvec(sock
, msg
, flags
, &buf
->tail
[0], want
, seek
);
459 if (offset
== count
|| msg
->msg_flags
& (MSG_EOR
|MSG_TRUNC
))
463 } else if (offset
< seek_init
)
467 *read
= offset
- seek_init
;
475 xs_read_header(struct sock_xprt
*transport
, struct xdr_buf
*buf
)
477 if (!transport
->recv
.copied
) {
478 if (buf
->head
[0].iov_len
>= transport
->recv
.offset
)
479 memcpy(buf
->head
[0].iov_base
,
480 &transport
->recv
.xid
,
481 transport
->recv
.offset
);
482 transport
->recv
.copied
= transport
->recv
.offset
;
487 xs_read_stream_request_done(struct sock_xprt
*transport
)
489 return transport
->recv
.fraghdr
& cpu_to_be32(RPC_LAST_STREAM_FRAGMENT
);
493 xs_read_stream_check_eor(struct sock_xprt
*transport
,
496 if (xs_read_stream_request_done(transport
))
497 msg
->msg_flags
|= MSG_EOR
;
501 xs_read_stream_request(struct sock_xprt
*transport
, struct msghdr
*msg
,
502 int flags
, struct rpc_rqst
*req
)
504 struct xdr_buf
*buf
= &req
->rq_private_buf
;
508 xs_read_header(transport
, buf
);
510 want
= transport
->recv
.len
- transport
->recv
.offset
;
512 ret
= xs_read_xdr_buf(transport
->sock
, msg
, flags
, buf
,
513 transport
->recv
.copied
+ want
,
514 transport
->recv
.copied
,
516 transport
->recv
.offset
+= read
;
517 transport
->recv
.copied
+= read
;
520 if (transport
->recv
.offset
== transport
->recv
.len
)
521 xs_read_stream_check_eor(transport
, msg
);
531 msg
->msg_flags
|= MSG_TRUNC
;
536 return ret
< 0 ? ret
: read
;
540 xs_read_stream_headersize(bool isfrag
)
543 return sizeof(__be32
);
544 return 3 * sizeof(__be32
);
548 xs_read_stream_header(struct sock_xprt
*transport
, struct msghdr
*msg
,
549 int flags
, size_t want
, size_t seek
)
552 .iov_base
= &transport
->recv
.fraghdr
,
555 return xs_read_kvec(transport
->sock
, msg
, flags
, &kvec
, want
, seek
);
558 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
560 xs_read_stream_call(struct sock_xprt
*transport
, struct msghdr
*msg
, int flags
)
562 struct rpc_xprt
*xprt
= &transport
->xprt
;
563 struct rpc_rqst
*req
;
566 /* Is this transport associated with the backchannel? */
570 /* Look up and lock the request corresponding to the given XID */
571 req
= xprt_lookup_bc_request(xprt
, transport
->recv
.xid
);
573 printk(KERN_WARNING
"Callback slot table overflowed\n");
576 if (transport
->recv
.copied
&& !req
->rq_private_buf
.len
)
579 ret
= xs_read_stream_request(transport
, msg
, flags
, req
);
580 if (msg
->msg_flags
& (MSG_EOR
|MSG_TRUNC
))
581 xprt_complete_bc_request(req
, transport
->recv
.copied
);
583 req
->rq_private_buf
.len
= transport
->recv
.copied
;
587 #else /* CONFIG_SUNRPC_BACKCHANNEL */
589 xs_read_stream_call(struct sock_xprt
*transport
, struct msghdr
*msg
, int flags
)
593 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
596 xs_read_stream_reply(struct sock_xprt
*transport
, struct msghdr
*msg
, int flags
)
598 struct rpc_xprt
*xprt
= &transport
->xprt
;
599 struct rpc_rqst
*req
;
602 /* Look up and lock the request corresponding to the given XID */
603 spin_lock(&xprt
->queue_lock
);
604 req
= xprt_lookup_rqst(xprt
, transport
->recv
.xid
);
605 if (!req
|| (transport
->recv
.copied
&& !req
->rq_private_buf
.len
)) {
606 msg
->msg_flags
|= MSG_TRUNC
;
610 spin_unlock(&xprt
->queue_lock
);
612 ret
= xs_read_stream_request(transport
, msg
, flags
, req
);
614 spin_lock(&xprt
->queue_lock
);
615 if (msg
->msg_flags
& (MSG_EOR
|MSG_TRUNC
))
616 xprt_complete_rqst(req
->rq_task
, transport
->recv
.copied
);
618 req
->rq_private_buf
.len
= transport
->recv
.copied
;
619 xprt_unpin_rqst(req
);
621 spin_unlock(&xprt
->queue_lock
);
626 xs_read_stream(struct sock_xprt
*transport
, int flags
)
628 struct msghdr msg
= { 0 };
629 size_t want
, read
= 0;
632 if (transport
->recv
.len
== 0) {
633 want
= xs_read_stream_headersize(transport
->recv
.copied
!= 0);
634 ret
= xs_read_stream_header(transport
, &msg
, flags
, want
,
635 transport
->recv
.offset
);
638 transport
->recv
.offset
= ret
;
639 if (transport
->recv
.offset
!= want
)
640 return transport
->recv
.offset
;
641 transport
->recv
.len
= be32_to_cpu(transport
->recv
.fraghdr
) &
642 RPC_FRAGMENT_SIZE_MASK
;
643 transport
->recv
.offset
-= sizeof(transport
->recv
.fraghdr
);
647 switch (be32_to_cpu(transport
->recv
.calldir
)) {
649 msg
.msg_flags
|= MSG_TRUNC
;
652 ret
= xs_read_stream_call(transport
, &msg
, flags
);
655 ret
= xs_read_stream_reply(transport
, &msg
, flags
);
657 if (msg
.msg_flags
& MSG_TRUNC
) {
658 transport
->recv
.calldir
= cpu_to_be32(-1);
659 transport
->recv
.copied
= -1;
664 if (transport
->recv
.offset
< transport
->recv
.len
) {
665 if (!(msg
.msg_flags
& MSG_TRUNC
))
668 ret
= xs_read_discard(transport
->sock
, &msg
, flags
,
669 transport
->recv
.len
- transport
->recv
.offset
);
672 transport
->recv
.offset
+= ret
;
674 if (transport
->recv
.offset
!= transport
->recv
.len
)
677 if (xs_read_stream_request_done(transport
)) {
678 trace_xs_stream_read_request(transport
);
679 transport
->recv
.copied
= 0;
681 transport
->recv
.offset
= 0;
682 transport
->recv
.len
= 0;
685 return ret
!= 0 ? ret
: -ESHUTDOWN
;
688 static __poll_t
xs_poll_socket(struct sock_xprt
*transport
)
690 return transport
->sock
->ops
->poll(transport
->file
, transport
->sock
,
694 static bool xs_poll_socket_readable(struct sock_xprt
*transport
)
696 __poll_t events
= xs_poll_socket(transport
);
698 return (events
& (EPOLLIN
| EPOLLRDNORM
)) && !(events
& EPOLLRDHUP
);
701 static void xs_poll_check_readable(struct sock_xprt
*transport
)
704 clear_bit(XPRT_SOCK_DATA_READY
, &transport
->sock_state
);
705 if (!xs_poll_socket_readable(transport
))
707 if (!test_and_set_bit(XPRT_SOCK_DATA_READY
, &transport
->sock_state
))
708 queue_work(xprtiod_workqueue
, &transport
->recv_worker
);
711 static void xs_stream_data_receive(struct sock_xprt
*transport
)
716 mutex_lock(&transport
->recv_mutex
);
717 if (transport
->sock
== NULL
)
720 ret
= xs_read_stream(transport
, MSG_DONTWAIT
);
726 if (ret
== -ESHUTDOWN
)
727 kernel_sock_shutdown(transport
->sock
, SHUT_RDWR
);
729 xs_poll_check_readable(transport
);
731 mutex_unlock(&transport
->recv_mutex
);
732 trace_xs_stream_read_data(&transport
->xprt
, ret
, read
);
735 static void xs_stream_data_receive_workfn(struct work_struct
*work
)
737 struct sock_xprt
*transport
=
738 container_of(work
, struct sock_xprt
, recv_worker
);
739 unsigned int pflags
= memalloc_nofs_save();
741 xs_stream_data_receive(transport
);
742 memalloc_nofs_restore(pflags
);
746 xs_stream_reset_connect(struct sock_xprt
*transport
)
748 transport
->recv
.offset
= 0;
749 transport
->recv
.len
= 0;
750 transport
->recv
.copied
= 0;
751 transport
->xmit
.offset
= 0;
755 xs_stream_start_connect(struct sock_xprt
*transport
)
757 transport
->xprt
.stat
.connect_count
++;
758 transport
->xprt
.stat
.connect_start
= jiffies
;
761 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
764 * xs_nospace - handle transmit was incomplete
765 * @req: pointer to RPC request
766 * @transport: pointer to struct sock_xprt
769 static int xs_nospace(struct rpc_rqst
*req
, struct sock_xprt
*transport
)
771 struct rpc_xprt
*xprt
= &transport
->xprt
;
772 struct sock
*sk
= transport
->inet
;
775 trace_rpc_socket_nospace(req
, transport
);
777 /* Protect against races with write_space */
778 spin_lock(&xprt
->transport_lock
);
780 /* Don't race with disconnect */
781 if (xprt_connected(xprt
)) {
782 struct socket_wq
*wq
;
785 wq
= rcu_dereference(sk
->sk_wq
);
786 set_bit(SOCKWQ_ASYNC_NOSPACE
, &wq
->flags
);
789 /* wait for more buffer space */
790 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
791 sk
->sk_write_pending
++;
792 xprt_wait_for_buffer_space(xprt
);
796 spin_unlock(&xprt
->transport_lock
);
800 static int xs_sock_nospace(struct rpc_rqst
*req
)
802 struct sock_xprt
*transport
=
803 container_of(req
->rq_xprt
, struct sock_xprt
, xprt
);
804 struct sock
*sk
= transport
->inet
;
808 if (!sock_writeable(sk
))
809 ret
= xs_nospace(req
, transport
);
814 static int xs_stream_nospace(struct rpc_rqst
*req
)
816 struct sock_xprt
*transport
=
817 container_of(req
->rq_xprt
, struct sock_xprt
, xprt
);
818 struct sock
*sk
= transport
->inet
;
822 if (!sk_stream_memory_free(sk
))
823 ret
= xs_nospace(req
, transport
);
829 xs_stream_prepare_request(struct rpc_rqst
*req
)
831 xdr_free_bvec(&req
->rq_rcv_buf
);
832 req
->rq_task
->tk_status
= xdr_alloc_bvec(&req
->rq_rcv_buf
, GFP_KERNEL
);
836 * Determine if the previous message in the stream was aborted before it
837 * could complete transmission.
840 xs_send_request_was_aborted(struct sock_xprt
*transport
, struct rpc_rqst
*req
)
842 return transport
->xmit
.offset
!= 0 && req
->rq_bytes_sent
== 0;
846 * Return the stream record marker field for a record of length < 2^31-1
849 xs_stream_record_marker(struct xdr_buf
*xdr
)
853 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT
| (u32
)xdr
->len
);
857 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
858 * @req: pointer to RPC request
861 * 0: The request has been sent
862 * EAGAIN: The socket was blocked, please call again later to
863 * complete the request
864 * ENOTCONN: Caller needs to invoke connect logic then call again
865 * other: Some other error occurred, the request was not sent
867 static int xs_local_send_request(struct rpc_rqst
*req
)
869 struct rpc_xprt
*xprt
= req
->rq_xprt
;
870 struct sock_xprt
*transport
=
871 container_of(xprt
, struct sock_xprt
, xprt
);
872 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
873 rpc_fraghdr rm
= xs_stream_record_marker(xdr
);
874 unsigned int msglen
= rm
? req
->rq_slen
+ sizeof(rm
) : req
->rq_slen
;
875 struct msghdr msg
= {
876 .msg_flags
= XS_SENDMSG_FLAGS
,
881 /* Close the stream if the previous transmission was incomplete */
882 if (xs_send_request_was_aborted(transport
, req
)) {
887 xs_pktdump("packet data:",
888 req
->rq_svec
->iov_base
, req
->rq_svec
->iov_len
);
890 req
->rq_xtime
= ktime_get();
891 status
= xprt_sock_sendmsg(transport
->sock
, &msg
, xdr
,
892 transport
->xmit
.offset
, rm
, &sent
);
893 dprintk("RPC: %s(%u) = %d\n",
894 __func__
, xdr
->len
- transport
->xmit
.offset
, status
);
896 if (status
== -EAGAIN
&& sock_writeable(transport
->inet
))
899 if (likely(sent
> 0) || status
== 0) {
900 transport
->xmit
.offset
+= sent
;
901 req
->rq_bytes_sent
= transport
->xmit
.offset
;
902 if (likely(req
->rq_bytes_sent
>= msglen
)) {
903 req
->rq_xmit_bytes_sent
+= transport
->xmit
.offset
;
904 transport
->xmit
.offset
= 0;
914 status
= xs_stream_nospace(req
);
917 dprintk("RPC: sendmsg returned unrecognized error %d\n",
929 * xs_udp_send_request - write an RPC request to a UDP socket
930 * @req: pointer to RPC request
933 * 0: The request has been sent
934 * EAGAIN: The socket was blocked, please call again later to
935 * complete the request
936 * ENOTCONN: Caller needs to invoke connect logic then call again
937 * other: Some other error occurred, the request was not sent
939 static int xs_udp_send_request(struct rpc_rqst
*req
)
941 struct rpc_xprt
*xprt
= req
->rq_xprt
;
942 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
943 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
944 struct msghdr msg
= {
945 .msg_name
= xs_addr(xprt
),
946 .msg_namelen
= xprt
->addrlen
,
947 .msg_flags
= XS_SENDMSG_FLAGS
,
952 xs_pktdump("packet data:",
953 req
->rq_svec
->iov_base
,
954 req
->rq_svec
->iov_len
);
956 if (!xprt_bound(xprt
))
959 if (!xprt_request_get_cong(xprt
, req
))
962 req
->rq_xtime
= ktime_get();
963 status
= xprt_sock_sendmsg(transport
->sock
, &msg
, xdr
, 0, 0, &sent
);
965 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
968 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
969 if (status
== -EPERM
)
972 if (status
== -EAGAIN
&& sock_writeable(transport
->inet
))
975 if (sent
> 0 || status
== 0) {
976 req
->rq_xmit_bytes_sent
+= sent
;
977 if (sent
>= req
->rq_slen
)
979 /* Still some bytes left; set up for a retry later. */
987 /* Should we call xs_close() here? */
990 status
= xs_sock_nospace(req
);
997 /* When the server has died, an ICMP port unreachable message
998 * prompts ECONNREFUSED. */
1001 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1009 * xs_tcp_send_request - write an RPC request to a TCP socket
1010 * @req: pointer to RPC request
1013 * 0: The request has been sent
1014 * EAGAIN: The socket was blocked, please call again later to
1015 * complete the request
1016 * ENOTCONN: Caller needs to invoke connect logic then call again
1017 * other: Some other error occurred, the request was not sent
1019 * XXX: In the case of soft timeouts, should we eventually give up
1020 * if sendmsg is not able to make progress?
1022 static int xs_tcp_send_request(struct rpc_rqst
*req
)
1024 struct rpc_xprt
*xprt
= req
->rq_xprt
;
1025 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1026 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
1027 rpc_fraghdr rm
= xs_stream_record_marker(xdr
);
1028 unsigned int msglen
= rm
? req
->rq_slen
+ sizeof(rm
) : req
->rq_slen
;
1029 struct msghdr msg
= {
1030 .msg_flags
= XS_SENDMSG_FLAGS
,
1032 bool vm_wait
= false;
1036 /* Close the stream if the previous transmission was incomplete */
1037 if (xs_send_request_was_aborted(transport
, req
)) {
1038 if (transport
->sock
!= NULL
)
1039 kernel_sock_shutdown(transport
->sock
, SHUT_RDWR
);
1042 if (!transport
->inet
)
1045 xs_pktdump("packet data:",
1046 req
->rq_svec
->iov_base
,
1047 req
->rq_svec
->iov_len
);
1049 if (test_bit(XPRT_SOCK_UPD_TIMEOUT
, &transport
->sock_state
))
1050 xs_tcp_set_socket_timeouts(xprt
, transport
->sock
);
1052 /* Continue transmitting the packet/record. We must be careful
1053 * to cope with writespace callbacks arriving _after_ we have
1054 * called sendmsg(). */
1055 req
->rq_xtime
= ktime_get();
1056 tcp_sock_set_cork(transport
->inet
, true);
1058 status
= xprt_sock_sendmsg(transport
->sock
, &msg
, xdr
,
1059 transport
->xmit
.offset
, rm
, &sent
);
1061 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1062 xdr
->len
- transport
->xmit
.offset
, status
);
1064 /* If we've sent the entire packet, immediately
1065 * reset the count of bytes sent. */
1066 transport
->xmit
.offset
+= sent
;
1067 req
->rq_bytes_sent
= transport
->xmit
.offset
;
1068 if (likely(req
->rq_bytes_sent
>= msglen
)) {
1069 req
->rq_xmit_bytes_sent
+= transport
->xmit
.offset
;
1070 transport
->xmit
.offset
= 0;
1071 if (atomic_long_read(&xprt
->xmit_queuelen
) == 1)
1072 tcp_sock_set_cork(transport
->inet
, false);
1076 WARN_ON_ONCE(sent
== 0 && status
== 0);
1078 if (status
== -EAGAIN
) {
1080 * Return EAGAIN if we're sure we're hitting the
1081 * socket send buffer limits.
1083 if (test_bit(SOCK_NOSPACE
, &transport
->sock
->flags
))
1086 * Did we hit a memory allocation failure?
1092 /* Retry, knowing now that we're below the
1093 * socket send buffer limit
1107 /* Should we call xs_close() here? */
1110 status
= xs_stream_nospace(req
);
1120 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1127 static void xs_save_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
1129 transport
->old_data_ready
= sk
->sk_data_ready
;
1130 transport
->old_state_change
= sk
->sk_state_change
;
1131 transport
->old_write_space
= sk
->sk_write_space
;
1132 transport
->old_error_report
= sk
->sk_error_report
;
1135 static void xs_restore_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
1137 sk
->sk_data_ready
= transport
->old_data_ready
;
1138 sk
->sk_state_change
= transport
->old_state_change
;
1139 sk
->sk_write_space
= transport
->old_write_space
;
1140 sk
->sk_error_report
= transport
->old_error_report
;
1143 static void xs_sock_reset_state_flags(struct rpc_xprt
*xprt
)
1145 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1147 clear_bit(XPRT_SOCK_DATA_READY
, &transport
->sock_state
);
1148 clear_bit(XPRT_SOCK_WAKE_ERROR
, &transport
->sock_state
);
1149 clear_bit(XPRT_SOCK_WAKE_WRITE
, &transport
->sock_state
);
1150 clear_bit(XPRT_SOCK_WAKE_DISCONNECT
, &transport
->sock_state
);
1153 static void xs_run_error_worker(struct sock_xprt
*transport
, unsigned int nr
)
1155 set_bit(nr
, &transport
->sock_state
);
1156 queue_work(xprtiod_workqueue
, &transport
->error_worker
);
1159 static void xs_sock_reset_connection_flags(struct rpc_xprt
*xprt
)
1161 smp_mb__before_atomic();
1162 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1163 clear_bit(XPRT_CLOSING
, &xprt
->state
);
1164 xs_sock_reset_state_flags(xprt
);
1165 smp_mb__after_atomic();
1169 * xs_error_report - callback to handle TCP socket state errors
1172 * Note: we don't call sock_error() since there may be a rpc_task
1173 * using the socket, and so we don't want to clear sk->sk_err.
1175 static void xs_error_report(struct sock
*sk
)
1177 struct sock_xprt
*transport
;
1178 struct rpc_xprt
*xprt
;
1180 read_lock_bh(&sk
->sk_callback_lock
);
1181 if (!(xprt
= xprt_from_sock(sk
)))
1184 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1185 transport
->xprt_err
= -sk
->sk_err
;
1186 if (transport
->xprt_err
== 0)
1188 dprintk("RPC: xs_error_report client %p, error=%d...\n",
1189 xprt
, -transport
->xprt_err
);
1190 trace_rpc_socket_error(xprt
, sk
->sk_socket
, transport
->xprt_err
);
1192 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1193 smp_mb__before_atomic();
1194 xs_run_error_worker(transport
, XPRT_SOCK_WAKE_ERROR
);
1196 read_unlock_bh(&sk
->sk_callback_lock
);
1199 static void xs_reset_transport(struct sock_xprt
*transport
)
1201 struct socket
*sock
= transport
->sock
;
1202 struct sock
*sk
= transport
->inet
;
1203 struct rpc_xprt
*xprt
= &transport
->xprt
;
1204 struct file
*filp
= transport
->file
;
1209 if (atomic_read(&transport
->xprt
.swapper
))
1210 sk_clear_memalloc(sk
);
1212 kernel_sock_shutdown(sock
, SHUT_RDWR
);
1214 mutex_lock(&transport
->recv_mutex
);
1215 write_lock_bh(&sk
->sk_callback_lock
);
1216 transport
->inet
= NULL
;
1217 transport
->sock
= NULL
;
1218 transport
->file
= NULL
;
1220 sk
->sk_user_data
= NULL
;
1222 xs_restore_old_callbacks(transport
, sk
);
1223 xprt_clear_connected(xprt
);
1224 write_unlock_bh(&sk
->sk_callback_lock
);
1225 xs_sock_reset_connection_flags(xprt
);
1226 /* Reset stream record info */
1227 xs_stream_reset_connect(transport
);
1228 mutex_unlock(&transport
->recv_mutex
);
1230 trace_rpc_socket_close(xprt
, sock
);
1233 xprt_disconnect_done(xprt
);
1237 * xs_close - close a socket
1240 * This is used when all requests are complete; ie, no DRC state remains
1241 * on the server we want to save.
1243 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1244 * xs_reset_transport() zeroing the socket from underneath a writer.
1246 static void xs_close(struct rpc_xprt
*xprt
)
1248 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1250 dprintk("RPC: xs_close xprt %p\n", xprt
);
1252 xs_reset_transport(transport
);
1253 xprt
->reestablish_timeout
= 0;
1256 static void xs_inject_disconnect(struct rpc_xprt
*xprt
)
1258 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1260 xprt_disconnect_done(xprt
);
1263 static void xs_xprt_free(struct rpc_xprt
*xprt
)
1265 xs_free_peer_addresses(xprt
);
1270 * xs_destroy - prepare to shutdown a transport
1271 * @xprt: doomed transport
1274 static void xs_destroy(struct rpc_xprt
*xprt
)
1276 struct sock_xprt
*transport
= container_of(xprt
,
1277 struct sock_xprt
, xprt
);
1278 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
1280 cancel_delayed_work_sync(&transport
->connect_worker
);
1282 cancel_work_sync(&transport
->recv_worker
);
1283 cancel_work_sync(&transport
->error_worker
);
1285 module_put(THIS_MODULE
);
1289 * xs_udp_data_read_skb - receive callback for UDP sockets
1295 static void xs_udp_data_read_skb(struct rpc_xprt
*xprt
,
1297 struct sk_buff
*skb
)
1299 struct rpc_task
*task
;
1300 struct rpc_rqst
*rovr
;
1301 int repsize
, copied
;
1307 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
1311 /* Copy the XID from the skb... */
1312 xp
= skb_header_pointer(skb
, 0, sizeof(_xid
), &_xid
);
1316 /* Look up and lock the request corresponding to the given XID */
1317 spin_lock(&xprt
->queue_lock
);
1318 rovr
= xprt_lookup_rqst(xprt
, *xp
);
1321 xprt_pin_rqst(rovr
);
1322 xprt_update_rtt(rovr
->rq_task
);
1323 spin_unlock(&xprt
->queue_lock
);
1324 task
= rovr
->rq_task
;
1326 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
1329 /* Suck it into the iovec, verify checksum if not done by hw. */
1330 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
1331 spin_lock(&xprt
->queue_lock
);
1332 __UDPX_INC_STATS(sk
, UDP_MIB_INERRORS
);
1337 spin_lock(&xprt
->transport_lock
);
1338 xprt_adjust_cwnd(xprt
, task
, copied
);
1339 spin_unlock(&xprt
->transport_lock
);
1340 spin_lock(&xprt
->queue_lock
);
1341 xprt_complete_rqst(task
, copied
);
1342 __UDPX_INC_STATS(sk
, UDP_MIB_INDATAGRAMS
);
1344 xprt_unpin_rqst(rovr
);
1346 spin_unlock(&xprt
->queue_lock
);
1349 static void xs_udp_data_receive(struct sock_xprt
*transport
)
1351 struct sk_buff
*skb
;
1355 mutex_lock(&transport
->recv_mutex
);
1356 sk
= transport
->inet
;
1360 skb
= skb_recv_udp(sk
, 0, 1, &err
);
1363 xs_udp_data_read_skb(&transport
->xprt
, sk
, skb
);
1367 xs_poll_check_readable(transport
);
1369 mutex_unlock(&transport
->recv_mutex
);
1372 static void xs_udp_data_receive_workfn(struct work_struct
*work
)
1374 struct sock_xprt
*transport
=
1375 container_of(work
, struct sock_xprt
, recv_worker
);
1376 unsigned int pflags
= memalloc_nofs_save();
1378 xs_udp_data_receive(transport
);
1379 memalloc_nofs_restore(pflags
);
1383 * xs_data_ready - "data ready" callback for UDP sockets
1384 * @sk: socket with data to read
1387 static void xs_data_ready(struct sock
*sk
)
1389 struct rpc_xprt
*xprt
;
1391 read_lock_bh(&sk
->sk_callback_lock
);
1392 dprintk("RPC: xs_data_ready...\n");
1393 xprt
= xprt_from_sock(sk
);
1395 struct sock_xprt
*transport
= container_of(xprt
,
1396 struct sock_xprt
, xprt
);
1397 transport
->old_data_ready(sk
);
1398 /* Any data means we had a useful conversation, so
1399 * then we don't need to delay the next reconnect
1401 if (xprt
->reestablish_timeout
)
1402 xprt
->reestablish_timeout
= 0;
1403 if (!test_and_set_bit(XPRT_SOCK_DATA_READY
, &transport
->sock_state
))
1404 queue_work(xprtiod_workqueue
, &transport
->recv_worker
);
1406 read_unlock_bh(&sk
->sk_callback_lock
);
1410 * Helper function to force a TCP close if the server is sending
1411 * junk and/or it has put us in CLOSE_WAIT
1413 static void xs_tcp_force_close(struct rpc_xprt
*xprt
)
1415 xprt_force_disconnect(xprt
);
1418 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1419 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt
*xprt
)
1423 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1426 * xs_tcp_state_change - callback to handle TCP socket state changes
1427 * @sk: socket whose state has changed
1430 static void xs_tcp_state_change(struct sock
*sk
)
1432 struct rpc_xprt
*xprt
;
1433 struct sock_xprt
*transport
;
1435 read_lock_bh(&sk
->sk_callback_lock
);
1436 if (!(xprt
= xprt_from_sock(sk
)))
1438 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
1439 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1440 sk
->sk_state
, xprt_connected(xprt
),
1441 sock_flag(sk
, SOCK_DEAD
),
1442 sock_flag(sk
, SOCK_ZAPPED
),
1445 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1446 trace_rpc_socket_state_change(xprt
, sk
->sk_socket
);
1447 switch (sk
->sk_state
) {
1448 case TCP_ESTABLISHED
:
1449 if (!xprt_test_and_set_connected(xprt
)) {
1450 xprt
->connect_cookie
++;
1451 clear_bit(XPRT_SOCK_CONNECTING
, &transport
->sock_state
);
1452 xprt_clear_connecting(xprt
);
1454 xprt
->stat
.connect_count
++;
1455 xprt
->stat
.connect_time
+= (long)jiffies
-
1456 xprt
->stat
.connect_start
;
1457 xs_run_error_worker(transport
, XPRT_SOCK_WAKE_PENDING
);
1461 /* The client initiated a shutdown of the socket */
1462 xprt
->connect_cookie
++;
1463 xprt
->reestablish_timeout
= 0;
1464 set_bit(XPRT_CLOSING
, &xprt
->state
);
1465 smp_mb__before_atomic();
1466 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1467 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1468 smp_mb__after_atomic();
1470 case TCP_CLOSE_WAIT
:
1471 /* The server initiated a shutdown of the socket */
1472 xprt
->connect_cookie
++;
1473 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1474 xs_run_error_worker(transport
, XPRT_SOCK_WAKE_DISCONNECT
);
1478 * If the server closed down the connection, make sure that
1479 * we back off before reconnecting
1481 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
1482 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1485 set_bit(XPRT_CLOSING
, &xprt
->state
);
1486 smp_mb__before_atomic();
1487 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1488 smp_mb__after_atomic();
1491 if (test_and_clear_bit(XPRT_SOCK_CONNECTING
,
1492 &transport
->sock_state
))
1493 xprt_clear_connecting(xprt
);
1494 clear_bit(XPRT_CLOSING
, &xprt
->state
);
1495 /* Trigger the socket release */
1496 xs_run_error_worker(transport
, XPRT_SOCK_WAKE_DISCONNECT
);
1499 read_unlock_bh(&sk
->sk_callback_lock
);
1502 static void xs_write_space(struct sock
*sk
)
1504 struct socket_wq
*wq
;
1505 struct sock_xprt
*transport
;
1506 struct rpc_xprt
*xprt
;
1510 clear_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1512 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1514 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1516 wq
= rcu_dereference(sk
->sk_wq
);
1517 if (!wq
|| test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE
, &wq
->flags
) == 0)
1520 xs_run_error_worker(transport
, XPRT_SOCK_WAKE_WRITE
);
1521 sk
->sk_write_pending
--;
1527 * xs_udp_write_space - callback invoked when socket buffer space
1529 * @sk: socket whose state has changed
1531 * Called when more output buffer space is available for this socket.
1532 * We try not to wake our writers until they can make "significant"
1533 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1534 * with a bunch of small requests.
1536 static void xs_udp_write_space(struct sock
*sk
)
1538 read_lock_bh(&sk
->sk_callback_lock
);
1540 /* from net/core/sock.c:sock_def_write_space */
1541 if (sock_writeable(sk
))
1544 read_unlock_bh(&sk
->sk_callback_lock
);
1548 * xs_tcp_write_space - callback invoked when socket buffer space
1550 * @sk: socket whose state has changed
1552 * Called when more output buffer space is available for this socket.
1553 * We try not to wake our writers until they can make "significant"
1554 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1555 * with a bunch of small requests.
1557 static void xs_tcp_write_space(struct sock
*sk
)
1559 read_lock_bh(&sk
->sk_callback_lock
);
1561 /* from net/core/stream.c:sk_stream_write_space */
1562 if (sk_stream_is_writeable(sk
))
1565 read_unlock_bh(&sk
->sk_callback_lock
);
1568 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1570 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1571 struct sock
*sk
= transport
->inet
;
1573 if (transport
->rcvsize
) {
1574 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1575 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1577 if (transport
->sndsize
) {
1578 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1579 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1580 sk
->sk_write_space(sk
);
1585 * xs_udp_set_buffer_size - set send and receive limits
1586 * @xprt: generic transport
1587 * @sndsize: requested size of send buffer, in bytes
1588 * @rcvsize: requested size of receive buffer, in bytes
1590 * Set socket send and receive buffer size limits.
1592 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1594 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1596 transport
->sndsize
= 0;
1598 transport
->sndsize
= sndsize
+ 1024;
1599 transport
->rcvsize
= 0;
1601 transport
->rcvsize
= rcvsize
+ 1024;
1603 xs_udp_do_set_buffer_size(xprt
);
1607 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1608 * @xprt: controlling transport
1609 * @task: task that timed out
1611 * Adjust the congestion window after a retransmit timeout has occurred.
1613 static void xs_udp_timer(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1615 spin_lock(&xprt
->transport_lock
);
1616 xprt_adjust_cwnd(xprt
, task
, -ETIMEDOUT
);
1617 spin_unlock(&xprt
->transport_lock
);
1620 static int xs_get_random_port(void)
1622 unsigned short min
= xprt_min_resvport
, max
= xprt_max_resvport
;
1623 unsigned short range
;
1624 unsigned short rand
;
1628 range
= max
- min
+ 1;
1629 rand
= (unsigned short) prandom_u32() % range
;
1633 static unsigned short xs_sock_getport(struct socket
*sock
)
1635 struct sockaddr_storage buf
;
1636 unsigned short port
= 0;
1638 if (kernel_getsockname(sock
, (struct sockaddr
*)&buf
) < 0)
1640 switch (buf
.ss_family
) {
1642 port
= ntohs(((struct sockaddr_in6
*)&buf
)->sin6_port
);
1645 port
= ntohs(((struct sockaddr_in
*)&buf
)->sin_port
);
1652 * xs_set_port - reset the port number in the remote endpoint address
1653 * @xprt: generic transport
1654 * @port: new port number
1657 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1659 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1661 rpc_set_port(xs_addr(xprt
), port
);
1662 xs_update_peer_port(xprt
);
1665 static void xs_set_srcport(struct sock_xprt
*transport
, struct socket
*sock
)
1667 if (transport
->srcport
== 0 && transport
->xprt
.reuseport
)
1668 transport
->srcport
= xs_sock_getport(sock
);
1671 static int xs_get_srcport(struct sock_xprt
*transport
)
1673 int port
= transport
->srcport
;
1675 if (port
== 0 && transport
->xprt
.resvport
)
1676 port
= xs_get_random_port();
1680 unsigned short get_srcport(struct rpc_xprt
*xprt
)
1682 struct sock_xprt
*sock
= container_of(xprt
, struct sock_xprt
, xprt
);
1683 return xs_sock_getport(sock
->sock
);
1685 EXPORT_SYMBOL(get_srcport
);
1687 static unsigned short xs_next_srcport(struct sock_xprt
*transport
, unsigned short port
)
1689 if (transport
->srcport
!= 0)
1690 transport
->srcport
= 0;
1691 if (!transport
->xprt
.resvport
)
1693 if (port
<= xprt_min_resvport
|| port
> xprt_max_resvport
)
1694 return xprt_max_resvport
;
1697 static int xs_bind(struct sock_xprt
*transport
, struct socket
*sock
)
1699 struct sockaddr_storage myaddr
;
1701 int port
= xs_get_srcport(transport
);
1702 unsigned short last
;
1705 * If we are asking for any ephemeral port (i.e. port == 0 &&
1706 * transport->xprt.resvport == 0), don't bind. Let the local
1707 * port selection happen implicitly when the socket is used
1708 * (for example at connect time).
1710 * This ensures that we can continue to establish TCP
1711 * connections even when all local ephemeral ports are already
1712 * a part of some TCP connection. This makes no difference
1713 * for UDP sockets, but also doesn't harm them.
1715 * If we're asking for any reserved port (i.e. port == 0 &&
1716 * transport->xprt.resvport == 1) xs_get_srcport above will
1717 * ensure that port is non-zero and we will bind as needed.
1722 memcpy(&myaddr
, &transport
->srcaddr
, transport
->xprt
.addrlen
);
1724 rpc_set_port((struct sockaddr
*)&myaddr
, port
);
1725 err
= kernel_bind(sock
, (struct sockaddr
*)&myaddr
,
1726 transport
->xprt
.addrlen
);
1728 if (transport
->xprt
.reuseport
)
1729 transport
->srcport
= port
;
1733 port
= xs_next_srcport(transport
, port
);
1736 } while (err
== -EADDRINUSE
&& nloop
!= 2);
1738 if (myaddr
.ss_family
== AF_INET
)
1739 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__
,
1740 &((struct sockaddr_in
*)&myaddr
)->sin_addr
,
1741 port
, err
? "failed" : "ok", err
);
1743 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__
,
1744 &((struct sockaddr_in6
*)&myaddr
)->sin6_addr
,
1745 port
, err
? "failed" : "ok", err
);
1750 * We don't support autobind on AF_LOCAL sockets
1752 static void xs_local_rpcbind(struct rpc_task
*task
)
1754 xprt_set_bound(task
->tk_xprt
);
1757 static void xs_local_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1761 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1762 static struct lock_class_key xs_key
[2];
1763 static struct lock_class_key xs_slock_key
[2];
1765 static inline void xs_reclassify_socketu(struct socket
*sock
)
1767 struct sock
*sk
= sock
->sk
;
1769 sock_lock_init_class_and_name(sk
, "slock-AF_LOCAL-RPC",
1770 &xs_slock_key
[1], "sk_lock-AF_LOCAL-RPC", &xs_key
[1]);
1773 static inline void xs_reclassify_socket4(struct socket
*sock
)
1775 struct sock
*sk
= sock
->sk
;
1777 sock_lock_init_class_and_name(sk
, "slock-AF_INET-RPC",
1778 &xs_slock_key
[0], "sk_lock-AF_INET-RPC", &xs_key
[0]);
1781 static inline void xs_reclassify_socket6(struct socket
*sock
)
1783 struct sock
*sk
= sock
->sk
;
1785 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-RPC",
1786 &xs_slock_key
[1], "sk_lock-AF_INET6-RPC", &xs_key
[1]);
1789 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1791 if (WARN_ON_ONCE(!sock_allow_reclassification(sock
->sk
)))
1796 xs_reclassify_socketu(sock
);
1799 xs_reclassify_socket4(sock
);
1802 xs_reclassify_socket6(sock
);
1807 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1812 static void xs_dummy_setup_socket(struct work_struct
*work
)
1816 static struct socket
*xs_create_sock(struct rpc_xprt
*xprt
,
1817 struct sock_xprt
*transport
, int family
, int type
,
1818 int protocol
, bool reuseport
)
1821 struct socket
*sock
;
1824 err
= __sock_create(xprt
->xprt_net
, family
, type
, protocol
, &sock
, 1);
1826 dprintk("RPC: can't create %d transport socket (%d).\n",
1830 xs_reclassify_socket(family
, sock
);
1833 sock_set_reuseport(sock
->sk
);
1835 err
= xs_bind(transport
, sock
);
1841 filp
= sock_alloc_file(sock
, O_NONBLOCK
, NULL
);
1843 return ERR_CAST(filp
);
1844 transport
->file
= filp
;
1848 return ERR_PTR(err
);
1851 static int xs_local_finish_connecting(struct rpc_xprt
*xprt
,
1852 struct socket
*sock
)
1854 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1857 if (!transport
->inet
) {
1858 struct sock
*sk
= sock
->sk
;
1860 write_lock_bh(&sk
->sk_callback_lock
);
1862 xs_save_old_callbacks(transport
, sk
);
1864 sk
->sk_user_data
= xprt
;
1865 sk
->sk_data_ready
= xs_data_ready
;
1866 sk
->sk_write_space
= xs_udp_write_space
;
1867 sock_set_flag(sk
, SOCK_FASYNC
);
1868 sk
->sk_error_report
= xs_error_report
;
1870 xprt_clear_connected(xprt
);
1872 /* Reset to new socket */
1873 transport
->sock
= sock
;
1874 transport
->inet
= sk
;
1876 write_unlock_bh(&sk
->sk_callback_lock
);
1879 xs_stream_start_connect(transport
);
1881 return kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, 0);
1885 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1886 * @transport: socket transport to connect
1888 static int xs_local_setup_socket(struct sock_xprt
*transport
)
1890 struct rpc_xprt
*xprt
= &transport
->xprt
;
1892 struct socket
*sock
;
1895 status
= __sock_create(xprt
->xprt_net
, AF_LOCAL
,
1896 SOCK_STREAM
, 0, &sock
, 1);
1898 dprintk("RPC: can't create AF_LOCAL "
1899 "transport socket (%d).\n", -status
);
1902 xs_reclassify_socket(AF_LOCAL
, sock
);
1904 filp
= sock_alloc_file(sock
, O_NONBLOCK
, NULL
);
1906 status
= PTR_ERR(filp
);
1909 transport
->file
= filp
;
1911 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1912 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1914 status
= xs_local_finish_connecting(xprt
, sock
);
1915 trace_rpc_socket_connect(xprt
, sock
, status
);
1918 dprintk("RPC: xprt %p connected to %s\n",
1919 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1920 xprt
->stat
.connect_count
++;
1921 xprt
->stat
.connect_time
+= (long)jiffies
-
1922 xprt
->stat
.connect_start
;
1923 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 task
->tk_rpc_status
= -ENOTCONN
;
1963 rpc_exit(task
, -ENOTCONN
);
1966 ret
= xs_local_setup_socket(transport
);
1967 if (ret
&& !RPC_IS_SOFTCONN(task
))
1968 msleep_interruptible(15000);
1971 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
1973 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
1974 * know that we have exclusive access to the socket), to guard against
1975 * races with xs_reset_transport.
1977 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
1979 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1983 * If there's no sock, then we have nothing to set. The
1984 * reconnecting process will get it for us.
1986 if (!transport
->inet
)
1988 if (atomic_read(&xprt
->swapper
))
1989 sk_set_memalloc(transport
->inet
);
1993 * xs_enable_swap - Tag this transport as being used for swap.
1994 * @xprt: transport to tag
1996 * Take a reference to this transport on behalf of the rpc_clnt, and
1997 * optionally mark it for swapping if it wasn't already.
2000 xs_enable_swap(struct rpc_xprt
*xprt
)
2002 struct sock_xprt
*xs
= container_of(xprt
, struct sock_xprt
, xprt
);
2004 if (atomic_inc_return(&xprt
->swapper
) != 1)
2006 if (wait_on_bit_lock(&xprt
->state
, XPRT_LOCKED
, TASK_KILLABLE
))
2007 return -ERESTARTSYS
;
2009 sk_set_memalloc(xs
->inet
);
2010 xprt_release_xprt(xprt
, NULL
);
2015 * xs_disable_swap - Untag this transport as being used for swap.
2016 * @xprt: transport to tag
2018 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2019 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2022 xs_disable_swap(struct rpc_xprt
*xprt
)
2024 struct sock_xprt
*xs
= container_of(xprt
, struct sock_xprt
, xprt
);
2026 if (!atomic_dec_and_test(&xprt
->swapper
))
2028 if (wait_on_bit_lock(&xprt
->state
, XPRT_LOCKED
, TASK_KILLABLE
))
2031 sk_clear_memalloc(xs
->inet
);
2032 xprt_release_xprt(xprt
, NULL
);
2035 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2040 xs_enable_swap(struct rpc_xprt
*xprt
)
2046 xs_disable_swap(struct rpc_xprt
*xprt
)
2051 static void xs_udp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2053 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2055 if (!transport
->inet
) {
2056 struct sock
*sk
= sock
->sk
;
2058 write_lock_bh(&sk
->sk_callback_lock
);
2060 xs_save_old_callbacks(transport
, sk
);
2062 sk
->sk_user_data
= xprt
;
2063 sk
->sk_data_ready
= xs_data_ready
;
2064 sk
->sk_write_space
= xs_udp_write_space
;
2065 sock_set_flag(sk
, SOCK_FASYNC
);
2067 xprt_set_connected(xprt
);
2069 /* Reset to new socket */
2070 transport
->sock
= sock
;
2071 transport
->inet
= sk
;
2073 xs_set_memalloc(xprt
);
2075 write_unlock_bh(&sk
->sk_callback_lock
);
2077 xs_udp_do_set_buffer_size(xprt
);
2079 xprt
->stat
.connect_start
= jiffies
;
2082 static void xs_udp_setup_socket(struct work_struct
*work
)
2084 struct sock_xprt
*transport
=
2085 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2086 struct rpc_xprt
*xprt
= &transport
->xprt
;
2087 struct socket
*sock
;
2090 sock
= xs_create_sock(xprt
, transport
,
2091 xs_addr(xprt
)->sa_family
, SOCK_DGRAM
,
2092 IPPROTO_UDP
, false);
2096 dprintk("RPC: worker connecting xprt %p via %s to "
2097 "%s (port %s)\n", xprt
,
2098 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2099 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2100 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2102 xs_udp_finish_connecting(xprt
, sock
);
2103 trace_rpc_socket_connect(xprt
, sock
, 0);
2106 xprt_clear_connecting(xprt
);
2107 xprt_unlock_connect(xprt
, transport
);
2108 xprt_wake_pending_tasks(xprt
, status
);
2112 * xs_tcp_shutdown - gracefully shut down a TCP socket
2115 * Initiates a graceful shutdown of the TCP socket by calling the
2116 * equivalent of shutdown(SHUT_RDWR);
2118 static void xs_tcp_shutdown(struct rpc_xprt
*xprt
)
2120 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2121 struct socket
*sock
= transport
->sock
;
2122 int skst
= transport
->inet
? transport
->inet
->sk_state
: TCP_CLOSE
;
2126 if (!xprt
->reuseport
) {
2134 case TCP_ESTABLISHED
:
2135 case TCP_CLOSE_WAIT
:
2136 kernel_sock_shutdown(sock
, SHUT_RDWR
);
2137 trace_rpc_socket_shutdown(xprt
, sock
);
2140 xs_reset_transport(transport
);
2144 static void xs_tcp_set_socket_timeouts(struct rpc_xprt
*xprt
,
2145 struct socket
*sock
)
2147 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2148 unsigned int keepidle
;
2149 unsigned int keepcnt
;
2152 spin_lock(&xprt
->transport_lock
);
2153 keepidle
= DIV_ROUND_UP(xprt
->timeout
->to_initval
, HZ
);
2154 keepcnt
= xprt
->timeout
->to_retries
+ 1;
2155 timeo
= jiffies_to_msecs(xprt
->timeout
->to_initval
) *
2156 (xprt
->timeout
->to_retries
+ 1);
2157 clear_bit(XPRT_SOCK_UPD_TIMEOUT
, &transport
->sock_state
);
2158 spin_unlock(&xprt
->transport_lock
);
2160 /* TCP Keepalive options */
2161 sock_set_keepalive(sock
->sk
);
2162 tcp_sock_set_keepidle(sock
->sk
, keepidle
);
2163 tcp_sock_set_keepintvl(sock
->sk
, keepidle
);
2164 tcp_sock_set_keepcnt(sock
->sk
, keepcnt
);
2166 /* TCP user timeout (see RFC5482) */
2167 tcp_sock_set_user_timeout(sock
->sk
, timeo
);
2170 static void xs_tcp_set_connect_timeout(struct rpc_xprt
*xprt
,
2171 unsigned long connect_timeout
,
2172 unsigned long reconnect_timeout
)
2174 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2175 struct rpc_timeout to
;
2176 unsigned long initval
;
2178 spin_lock(&xprt
->transport_lock
);
2179 if (reconnect_timeout
< xprt
->max_reconnect_timeout
)
2180 xprt
->max_reconnect_timeout
= reconnect_timeout
;
2181 if (connect_timeout
< xprt
->connect_timeout
) {
2182 memcpy(&to
, xprt
->timeout
, sizeof(to
));
2183 initval
= DIV_ROUND_UP(connect_timeout
, to
.to_retries
+ 1);
2184 /* Arbitrary lower limit */
2185 if (initval
< XS_TCP_INIT_REEST_TO
<< 1)
2186 initval
= XS_TCP_INIT_REEST_TO
<< 1;
2187 to
.to_initval
= initval
;
2188 to
.to_maxval
= initval
;
2189 memcpy(&transport
->tcp_timeout
, &to
,
2190 sizeof(transport
->tcp_timeout
));
2191 xprt
->timeout
= &transport
->tcp_timeout
;
2192 xprt
->connect_timeout
= connect_timeout
;
2194 set_bit(XPRT_SOCK_UPD_TIMEOUT
, &transport
->sock_state
);
2195 spin_unlock(&xprt
->transport_lock
);
2198 static int xs_tcp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2200 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2201 int ret
= -ENOTCONN
;
2203 if (!transport
->inet
) {
2204 struct sock
*sk
= sock
->sk
;
2206 /* Avoid temporary address, they are bad for long-lived
2207 * connections such as NFS mounts.
2208 * RFC4941, section 3.6 suggests that:
2209 * Individual applications, which have specific
2210 * knowledge about the normal duration of connections,
2211 * MAY override this as appropriate.
2213 if (xs_addr(xprt
)->sa_family
== PF_INET6
) {
2214 ip6_sock_set_addr_preferences(sk
,
2215 IPV6_PREFER_SRC_PUBLIC
);
2218 xs_tcp_set_socket_timeouts(xprt
, sock
);
2219 tcp_sock_set_nodelay(sk
);
2221 write_lock_bh(&sk
->sk_callback_lock
);
2223 xs_save_old_callbacks(transport
, sk
);
2225 sk
->sk_user_data
= xprt
;
2226 sk
->sk_data_ready
= xs_data_ready
;
2227 sk
->sk_state_change
= xs_tcp_state_change
;
2228 sk
->sk_write_space
= xs_tcp_write_space
;
2229 sock_set_flag(sk
, SOCK_FASYNC
);
2230 sk
->sk_error_report
= xs_error_report
;
2232 /* socket options */
2233 sock_reset_flag(sk
, SOCK_LINGER
);
2235 xprt_clear_connected(xprt
);
2237 /* Reset to new socket */
2238 transport
->sock
= sock
;
2239 transport
->inet
= sk
;
2241 write_unlock_bh(&sk
->sk_callback_lock
);
2244 if (!xprt_bound(xprt
))
2247 xs_set_memalloc(xprt
);
2249 xs_stream_start_connect(transport
);
2251 /* Tell the socket layer to start connecting... */
2252 set_bit(XPRT_SOCK_CONNECTING
, &transport
->sock_state
);
2253 ret
= kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, O_NONBLOCK
);
2256 xs_set_srcport(transport
, sock
);
2260 set_bit(XPRT_SOCK_CONNECT_SENT
, &transport
->sock_state
);
2261 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2262 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2264 case -EADDRNOTAVAIL
:
2265 /* Source port number is unavailable. Try a new one! */
2266 transport
->srcport
= 0;
2273 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2274 * @work: queued work item
2276 * Invoked by a work queue tasklet.
2278 static void xs_tcp_setup_socket(struct work_struct
*work
)
2280 struct sock_xprt
*transport
=
2281 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2282 struct socket
*sock
= transport
->sock
;
2283 struct rpc_xprt
*xprt
= &transport
->xprt
;
2286 if (xprt_connected(xprt
))
2288 if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT
,
2289 &transport
->sock_state
) ||
2291 xs_reset_transport(transport
);
2292 sock
= xs_create_sock(xprt
, transport
, xs_addr(xprt
)->sa_family
,
2293 SOCK_STREAM
, IPPROTO_TCP
, true);
2295 status
= PTR_ERR(sock
);
2300 dprintk("RPC: worker connecting xprt %p via %s to "
2301 "%s (port %s)\n", xprt
,
2302 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2303 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2304 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2306 status
= xs_tcp_finish_connecting(xprt
, sock
);
2307 trace_rpc_socket_connect(xprt
, sock
, status
);
2308 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2309 xprt
, -status
, xprt_connected(xprt
),
2310 sock
->sk
->sk_state
);
2313 printk("%s: connect returned unhandled error %d\n",
2316 case -EADDRNOTAVAIL
:
2317 /* We're probably in TIME_WAIT. Get rid of existing socket,
2320 xs_tcp_force_close(xprt
);
2325 xprt_unlock_connect(xprt
, transport
);
2328 /* Happens, for instance, if the user specified a link
2329 * local IPv6 address without a scope-id.
2338 /* xs_tcp_force_close() wakes tasks with a fixed error code.
2339 * We need to wake them first to ensure the correct error code.
2341 xprt_wake_pending_tasks(xprt
, status
);
2342 xs_tcp_force_close(xprt
);
2347 xprt_clear_connecting(xprt
);
2348 xprt_unlock_connect(xprt
, transport
);
2349 xprt_wake_pending_tasks(xprt
, status
);
2353 * xs_connect - connect a socket to a remote endpoint
2354 * @xprt: pointer to transport structure
2355 * @task: address of RPC task that manages state of connect request
2357 * TCP: If the remote end dropped the connection, delay reconnecting.
2359 * UDP socket connects are synchronous, but we use a work queue anyway
2360 * to guarantee that even unprivileged user processes can set up a
2361 * socket on a privileged port.
2363 * If a UDP socket connect fails, the delay behavior here prevents
2364 * retry floods (hard mounts).
2366 static void xs_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
2368 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2369 unsigned long delay
= 0;
2371 WARN_ON_ONCE(!xprt_lock_connect(xprt
, task
, transport
));
2373 if (transport
->sock
!= NULL
) {
2374 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2375 "seconds\n", xprt
, xprt
->reestablish_timeout
/ HZ
);
2377 delay
= xprt_reconnect_delay(xprt
);
2378 xprt_reconnect_backoff(xprt
, XS_TCP_INIT_REEST_TO
);
2381 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
2383 queue_delayed_work(xprtiod_workqueue
,
2384 &transport
->connect_worker
,
2388 static void xs_wake_disconnect(struct sock_xprt
*transport
)
2390 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT
, &transport
->sock_state
))
2391 xs_tcp_force_close(&transport
->xprt
);
2394 static void xs_wake_write(struct sock_xprt
*transport
)
2396 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE
, &transport
->sock_state
))
2397 xprt_write_space(&transport
->xprt
);
2400 static void xs_wake_error(struct sock_xprt
*transport
)
2404 if (!test_bit(XPRT_SOCK_WAKE_ERROR
, &transport
->sock_state
))
2406 mutex_lock(&transport
->recv_mutex
);
2407 if (transport
->sock
== NULL
)
2409 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR
, &transport
->sock_state
))
2411 sockerr
= xchg(&transport
->xprt_err
, 0);
2413 xprt_wake_pending_tasks(&transport
->xprt
, sockerr
);
2415 mutex_unlock(&transport
->recv_mutex
);
2418 static void xs_wake_pending(struct sock_xprt
*transport
)
2420 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING
, &transport
->sock_state
))
2421 xprt_wake_pending_tasks(&transport
->xprt
, -EAGAIN
);
2424 static void xs_error_handle(struct work_struct
*work
)
2426 struct sock_xprt
*transport
= container_of(work
,
2427 struct sock_xprt
, error_worker
);
2429 xs_wake_disconnect(transport
);
2430 xs_wake_write(transport
);
2431 xs_wake_error(transport
);
2432 xs_wake_pending(transport
);
2436 * xs_local_print_stats - display AF_LOCAL socket-specific stats
2437 * @xprt: rpc_xprt struct containing statistics
2441 static void xs_local_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2445 if (xprt_connected(xprt
))
2446 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2448 seq_printf(seq
, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2449 "%llu %llu %lu %llu %llu\n",
2450 xprt
->stat
.bind_count
,
2451 xprt
->stat
.connect_count
,
2452 xprt
->stat
.connect_time
/ HZ
,
2456 xprt
->stat
.bad_xids
,
2459 xprt
->stat
.max_slots
,
2460 xprt
->stat
.sending_u
,
2461 xprt
->stat
.pending_u
);
2465 * xs_udp_print_stats - display UDP socket-specific stats
2466 * @xprt: rpc_xprt struct containing statistics
2470 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2472 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2474 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2477 xprt
->stat
.bind_count
,
2480 xprt
->stat
.bad_xids
,
2483 xprt
->stat
.max_slots
,
2484 xprt
->stat
.sending_u
,
2485 xprt
->stat
.pending_u
);
2489 * xs_tcp_print_stats - display TCP socket-specific stats
2490 * @xprt: rpc_xprt struct containing statistics
2494 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2496 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2499 if (xprt_connected(xprt
))
2500 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2502 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2503 "%llu %llu %lu %llu %llu\n",
2505 xprt
->stat
.bind_count
,
2506 xprt
->stat
.connect_count
,
2507 xprt
->stat
.connect_time
/ HZ
,
2511 xprt
->stat
.bad_xids
,
2514 xprt
->stat
.max_slots
,
2515 xprt
->stat
.sending_u
,
2516 xprt
->stat
.pending_u
);
2520 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2521 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2522 * to use the server side send routines.
2524 static int bc_malloc(struct rpc_task
*task
)
2526 struct rpc_rqst
*rqst
= task
->tk_rqstp
;
2527 size_t size
= rqst
->rq_callsize
;
2529 struct rpc_buffer
*buf
;
2531 if (size
> PAGE_SIZE
- sizeof(struct rpc_buffer
)) {
2532 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2537 page
= alloc_page(GFP_KERNEL
);
2541 buf
= page_address(page
);
2542 buf
->len
= PAGE_SIZE
;
2544 rqst
->rq_buffer
= buf
->data
;
2545 rqst
->rq_rbuffer
= (char *)rqst
->rq_buffer
+ rqst
->rq_callsize
;
2550 * Free the space allocated in the bc_alloc routine
2552 static void bc_free(struct rpc_task
*task
)
2554 void *buffer
= task
->tk_rqstp
->rq_buffer
;
2555 struct rpc_buffer
*buf
;
2557 buf
= container_of(buffer
, struct rpc_buffer
, data
);
2558 free_page((unsigned long)buf
);
2561 static int bc_sendto(struct rpc_rqst
*req
)
2563 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
2564 struct sock_xprt
*transport
=
2565 container_of(req
->rq_xprt
, struct sock_xprt
, xprt
);
2566 struct msghdr msg
= {
2569 rpc_fraghdr marker
= cpu_to_be32(RPC_LAST_STREAM_FRAGMENT
|
2571 unsigned int sent
= 0;
2574 req
->rq_xtime
= ktime_get();
2575 err
= xprt_sock_sendmsg(transport
->sock
, &msg
, xdr
, 0, marker
, &sent
);
2577 if (err
< 0 || sent
!= (xdr
->len
+ sizeof(marker
)))
2583 * bc_send_request - Send a backchannel Call on a TCP socket
2584 * @req: rpc_rqst containing Call message to be sent
2586 * xpt_mutex ensures @rqstp's whole message is written to the socket
2587 * without interruption.
2590 * %0 if the message was sent successfully
2591 * %ENOTCONN if the message was not sent
2593 static int bc_send_request(struct rpc_rqst
*req
)
2595 struct svc_xprt
*xprt
;
2599 * Get the server socket associated with this callback xprt
2601 xprt
= req
->rq_xprt
->bc_xprt
;
2604 * Grab the mutex to serialize data as the connection is shared
2605 * with the fore channel
2607 mutex_lock(&xprt
->xpt_mutex
);
2608 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
))
2611 len
= bc_sendto(req
);
2612 mutex_unlock(&xprt
->xpt_mutex
);
2621 * The close routine. Since this is client initiated, we do nothing
2624 static void bc_close(struct rpc_xprt
*xprt
)
2626 xprt_disconnect_done(xprt
);
2630 * The xprt destroy routine. Again, because this connection is client
2631 * initiated, we do nothing
2634 static void bc_destroy(struct rpc_xprt
*xprt
)
2636 dprintk("RPC: bc_destroy xprt %p\n", xprt
);
2639 module_put(THIS_MODULE
);
2642 static const struct rpc_xprt_ops xs_local_ops
= {
2643 .reserve_xprt
= xprt_reserve_xprt
,
2644 .release_xprt
= xprt_release_xprt
,
2645 .alloc_slot
= xprt_alloc_slot
,
2646 .free_slot
= xprt_free_slot
,
2647 .rpcbind
= xs_local_rpcbind
,
2648 .set_port
= xs_local_set_port
,
2649 .connect
= xs_local_connect
,
2650 .buf_alloc
= rpc_malloc
,
2651 .buf_free
= rpc_free
,
2652 .prepare_request
= xs_stream_prepare_request
,
2653 .send_request
= xs_local_send_request
,
2654 .wait_for_reply_request
= xprt_wait_for_reply_request_def
,
2656 .destroy
= xs_destroy
,
2657 .print_stats
= xs_local_print_stats
,
2658 .enable_swap
= xs_enable_swap
,
2659 .disable_swap
= xs_disable_swap
,
2662 static const struct rpc_xprt_ops xs_udp_ops
= {
2663 .set_buffer_size
= xs_udp_set_buffer_size
,
2664 .reserve_xprt
= xprt_reserve_xprt_cong
,
2665 .release_xprt
= xprt_release_xprt_cong
,
2666 .alloc_slot
= xprt_alloc_slot
,
2667 .free_slot
= xprt_free_slot
,
2668 .rpcbind
= rpcb_getport_async
,
2669 .set_port
= xs_set_port
,
2670 .connect
= xs_connect
,
2671 .buf_alloc
= rpc_malloc
,
2672 .buf_free
= rpc_free
,
2673 .send_request
= xs_udp_send_request
,
2674 .wait_for_reply_request
= xprt_wait_for_reply_request_rtt
,
2675 .timer
= xs_udp_timer
,
2676 .release_request
= xprt_release_rqst_cong
,
2678 .destroy
= xs_destroy
,
2679 .print_stats
= xs_udp_print_stats
,
2680 .enable_swap
= xs_enable_swap
,
2681 .disable_swap
= xs_disable_swap
,
2682 .inject_disconnect
= xs_inject_disconnect
,
2685 static const struct rpc_xprt_ops xs_tcp_ops
= {
2686 .reserve_xprt
= xprt_reserve_xprt
,
2687 .release_xprt
= xprt_release_xprt
,
2688 .alloc_slot
= xprt_alloc_slot
,
2689 .free_slot
= xprt_free_slot
,
2690 .rpcbind
= rpcb_getport_async
,
2691 .set_port
= xs_set_port
,
2692 .connect
= xs_connect
,
2693 .buf_alloc
= rpc_malloc
,
2694 .buf_free
= rpc_free
,
2695 .prepare_request
= xs_stream_prepare_request
,
2696 .send_request
= xs_tcp_send_request
,
2697 .wait_for_reply_request
= xprt_wait_for_reply_request_def
,
2698 .close
= xs_tcp_shutdown
,
2699 .destroy
= xs_destroy
,
2700 .set_connect_timeout
= xs_tcp_set_connect_timeout
,
2701 .print_stats
= xs_tcp_print_stats
,
2702 .enable_swap
= xs_enable_swap
,
2703 .disable_swap
= xs_disable_swap
,
2704 .inject_disconnect
= xs_inject_disconnect
,
2705 #ifdef CONFIG_SUNRPC_BACKCHANNEL
2706 .bc_setup
= xprt_setup_bc
,
2707 .bc_maxpayload
= xs_tcp_bc_maxpayload
,
2708 .bc_num_slots
= xprt_bc_max_slots
,
2709 .bc_free_rqst
= xprt_free_bc_rqst
,
2710 .bc_destroy
= xprt_destroy_bc
,
2715 * The rpc_xprt_ops for the server backchannel
2718 static const struct rpc_xprt_ops bc_tcp_ops
= {
2719 .reserve_xprt
= xprt_reserve_xprt
,
2720 .release_xprt
= xprt_release_xprt
,
2721 .alloc_slot
= xprt_alloc_slot
,
2722 .free_slot
= xprt_free_slot
,
2723 .buf_alloc
= bc_malloc
,
2724 .buf_free
= bc_free
,
2725 .send_request
= bc_send_request
,
2726 .wait_for_reply_request
= xprt_wait_for_reply_request_def
,
2728 .destroy
= bc_destroy
,
2729 .print_stats
= xs_tcp_print_stats
,
2730 .enable_swap
= xs_enable_swap
,
2731 .disable_swap
= xs_disable_swap
,
2732 .inject_disconnect
= xs_inject_disconnect
,
2735 static int xs_init_anyaddr(const int family
, struct sockaddr
*sap
)
2737 static const struct sockaddr_in sin
= {
2738 .sin_family
= AF_INET
,
2739 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
2741 static const struct sockaddr_in6 sin6
= {
2742 .sin6_family
= AF_INET6
,
2743 .sin6_addr
= IN6ADDR_ANY_INIT
,
2750 memcpy(sap
, &sin
, sizeof(sin
));
2753 memcpy(sap
, &sin6
, sizeof(sin6
));
2756 dprintk("RPC: %s: Bad address family\n", __func__
);
2757 return -EAFNOSUPPORT
;
2762 static struct rpc_xprt
*xs_setup_xprt(struct xprt_create
*args
,
2763 unsigned int slot_table_size
,
2764 unsigned int max_slot_table_size
)
2766 struct rpc_xprt
*xprt
;
2767 struct sock_xprt
*new;
2769 if (args
->addrlen
> sizeof(xprt
->addr
)) {
2770 dprintk("RPC: xs_setup_xprt: address too large\n");
2771 return ERR_PTR(-EBADF
);
2774 xprt
= xprt_alloc(args
->net
, sizeof(*new), slot_table_size
,
2775 max_slot_table_size
);
2777 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2779 return ERR_PTR(-ENOMEM
);
2782 new = container_of(xprt
, struct sock_xprt
, xprt
);
2783 mutex_init(&new->recv_mutex
);
2784 memcpy(&xprt
->addr
, args
->dstaddr
, args
->addrlen
);
2785 xprt
->addrlen
= args
->addrlen
;
2787 memcpy(&new->srcaddr
, args
->srcaddr
, args
->addrlen
);
2790 err
= xs_init_anyaddr(args
->dstaddr
->sa_family
,
2791 (struct sockaddr
*)&new->srcaddr
);
2794 return ERR_PTR(err
);
2801 static const struct rpc_timeout xs_local_default_timeout
= {
2802 .to_initval
= 10 * HZ
,
2803 .to_maxval
= 10 * HZ
,
2808 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2809 * @args: rpc transport creation arguments
2811 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2813 static struct rpc_xprt
*xs_setup_local(struct xprt_create
*args
)
2815 struct sockaddr_un
*sun
= (struct sockaddr_un
*)args
->dstaddr
;
2816 struct sock_xprt
*transport
;
2817 struct rpc_xprt
*xprt
;
2818 struct rpc_xprt
*ret
;
2820 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2821 xprt_max_tcp_slot_table_entries
);
2824 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2827 xprt
->xprt_class
= &xs_local_transport
;
2828 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2830 xprt
->bind_timeout
= XS_BIND_TO
;
2831 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2832 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2834 xprt
->ops
= &xs_local_ops
;
2835 xprt
->timeout
= &xs_local_default_timeout
;
2837 INIT_WORK(&transport
->recv_worker
, xs_stream_data_receive_workfn
);
2838 INIT_WORK(&transport
->error_worker
, xs_error_handle
);
2839 INIT_DELAYED_WORK(&transport
->connect_worker
, xs_dummy_setup_socket
);
2841 switch (sun
->sun_family
) {
2843 if (sun
->sun_path
[0] != '/') {
2844 dprintk("RPC: bad AF_LOCAL address: %s\n",
2846 ret
= ERR_PTR(-EINVAL
);
2849 xprt_set_bound(xprt
);
2850 xs_format_peer_addresses(xprt
, "local", RPCBIND_NETID_LOCAL
);
2851 ret
= ERR_PTR(xs_local_setup_socket(transport
));
2856 ret
= ERR_PTR(-EAFNOSUPPORT
);
2860 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2861 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2863 if (try_module_get(THIS_MODULE
))
2865 ret
= ERR_PTR(-EINVAL
);
2871 static const struct rpc_timeout xs_udp_default_timeout
= {
2872 .to_initval
= 5 * HZ
,
2873 .to_maxval
= 30 * HZ
,
2874 .to_increment
= 5 * HZ
,
2879 * xs_setup_udp - Set up transport to use a UDP socket
2880 * @args: rpc transport creation arguments
2883 static struct rpc_xprt
*xs_setup_udp(struct xprt_create
*args
)
2885 struct sockaddr
*addr
= args
->dstaddr
;
2886 struct rpc_xprt
*xprt
;
2887 struct sock_xprt
*transport
;
2888 struct rpc_xprt
*ret
;
2890 xprt
= xs_setup_xprt(args
, xprt_udp_slot_table_entries
,
2891 xprt_udp_slot_table_entries
);
2894 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2896 xprt
->prot
= IPPROTO_UDP
;
2897 xprt
->xprt_class
= &xs_udp_transport
;
2898 /* XXX: header size can vary due to auth type, IPv6, etc. */
2899 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
2901 xprt
->bind_timeout
= XS_BIND_TO
;
2902 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
2903 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2905 xprt
->ops
= &xs_udp_ops
;
2907 xprt
->timeout
= &xs_udp_default_timeout
;
2909 INIT_WORK(&transport
->recv_worker
, xs_udp_data_receive_workfn
);
2910 INIT_WORK(&transport
->error_worker
, xs_error_handle
);
2911 INIT_DELAYED_WORK(&transport
->connect_worker
, xs_udp_setup_socket
);
2913 switch (addr
->sa_family
) {
2915 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2916 xprt_set_bound(xprt
);
2918 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP
);
2921 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2922 xprt_set_bound(xprt
);
2924 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP6
);
2927 ret
= ERR_PTR(-EAFNOSUPPORT
);
2931 if (xprt_bound(xprt
))
2932 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2933 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2934 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2935 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2937 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2938 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2939 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2941 if (try_module_get(THIS_MODULE
))
2943 ret
= ERR_PTR(-EINVAL
);
2949 static const struct rpc_timeout xs_tcp_default_timeout
= {
2950 .to_initval
= 60 * HZ
,
2951 .to_maxval
= 60 * HZ
,
2956 * xs_setup_tcp - Set up transport to use a TCP socket
2957 * @args: rpc transport creation arguments
2960 static struct rpc_xprt
*xs_setup_tcp(struct xprt_create
*args
)
2962 struct sockaddr
*addr
= args
->dstaddr
;
2963 struct rpc_xprt
*xprt
;
2964 struct sock_xprt
*transport
;
2965 struct rpc_xprt
*ret
;
2966 unsigned int max_slot_table_size
= xprt_max_tcp_slot_table_entries
;
2968 if (args
->flags
& XPRT_CREATE_INFINITE_SLOTS
)
2969 max_slot_table_size
= RPC_MAX_SLOT_TABLE_LIMIT
;
2971 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2972 max_slot_table_size
);
2975 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2977 xprt
->prot
= IPPROTO_TCP
;
2978 xprt
->xprt_class
= &xs_tcp_transport
;
2979 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2981 xprt
->bind_timeout
= XS_BIND_TO
;
2982 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2983 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2985 xprt
->ops
= &xs_tcp_ops
;
2986 xprt
->timeout
= &xs_tcp_default_timeout
;
2988 xprt
->max_reconnect_timeout
= xprt
->timeout
->to_maxval
;
2989 xprt
->connect_timeout
= xprt
->timeout
->to_initval
*
2990 (xprt
->timeout
->to_retries
+ 1);
2992 INIT_WORK(&transport
->recv_worker
, xs_stream_data_receive_workfn
);
2993 INIT_WORK(&transport
->error_worker
, xs_error_handle
);
2994 INIT_DELAYED_WORK(&transport
->connect_worker
, xs_tcp_setup_socket
);
2996 switch (addr
->sa_family
) {
2998 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2999 xprt_set_bound(xprt
);
3001 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP
);
3004 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
3005 xprt_set_bound(xprt
);
3007 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP6
);
3010 ret
= ERR_PTR(-EAFNOSUPPORT
);
3014 if (xprt_bound(xprt
))
3015 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3016 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
3017 xprt
->address_strings
[RPC_DISPLAY_PORT
],
3018 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
3020 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3021 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
3022 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
3024 if (try_module_get(THIS_MODULE
))
3026 ret
= ERR_PTR(-EINVAL
);
3033 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3034 * @args: rpc transport creation arguments
3037 static struct rpc_xprt
*xs_setup_bc_tcp(struct xprt_create
*args
)
3039 struct sockaddr
*addr
= args
->dstaddr
;
3040 struct rpc_xprt
*xprt
;
3041 struct sock_xprt
*transport
;
3042 struct svc_sock
*bc_sock
;
3043 struct rpc_xprt
*ret
;
3045 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
3046 xprt_tcp_slot_table_entries
);
3049 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
3051 xprt
->prot
= IPPROTO_TCP
;
3052 xprt
->xprt_class
= &xs_bc_tcp_transport
;
3053 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
3054 xprt
->timeout
= &xs_tcp_default_timeout
;
3057 xprt_set_bound(xprt
);
3058 xprt
->bind_timeout
= 0;
3059 xprt
->reestablish_timeout
= 0;
3060 xprt
->idle_timeout
= 0;
3062 xprt
->ops
= &bc_tcp_ops
;
3064 switch (addr
->sa_family
) {
3066 xs_format_peer_addresses(xprt
, "tcp",
3070 xs_format_peer_addresses(xprt
, "tcp",
3071 RPCBIND_NETID_TCP6
);
3074 ret
= ERR_PTR(-EAFNOSUPPORT
);
3078 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3079 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
3080 xprt
->address_strings
[RPC_DISPLAY_PORT
],
3081 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
3084 * Once we've associated a backchannel xprt with a connection,
3085 * we want to keep it around as long as the connection lasts,
3086 * in case we need to start using it for a backchannel again;
3087 * this reference won't be dropped until bc_xprt is destroyed.
3090 args
->bc_xprt
->xpt_bc_xprt
= xprt
;
3091 xprt
->bc_xprt
= args
->bc_xprt
;
3092 bc_sock
= container_of(args
->bc_xprt
, struct svc_sock
, sk_xprt
);
3093 transport
->sock
= bc_sock
->sk_sock
;
3094 transport
->inet
= bc_sock
->sk_sk
;
3097 * Since we don't want connections for the backchannel, we set
3098 * the xprt status to connected
3100 xprt_set_connected(xprt
);
3102 if (try_module_get(THIS_MODULE
))
3105 args
->bc_xprt
->xpt_bc_xprt
= NULL
;
3106 args
->bc_xprt
->xpt_bc_xps
= NULL
;
3108 ret
= ERR_PTR(-EINVAL
);
3114 static struct xprt_class xs_local_transport
= {
3115 .list
= LIST_HEAD_INIT(xs_local_transport
.list
),
3116 .name
= "named UNIX socket",
3117 .owner
= THIS_MODULE
,
3118 .ident
= XPRT_TRANSPORT_LOCAL
,
3119 .setup
= xs_setup_local
,
3123 static struct xprt_class xs_udp_transport
= {
3124 .list
= LIST_HEAD_INIT(xs_udp_transport
.list
),
3126 .owner
= THIS_MODULE
,
3127 .ident
= XPRT_TRANSPORT_UDP
,
3128 .setup
= xs_setup_udp
,
3129 .netid
= { "udp", "udp6", "" },
3132 static struct xprt_class xs_tcp_transport
= {
3133 .list
= LIST_HEAD_INIT(xs_tcp_transport
.list
),
3135 .owner
= THIS_MODULE
,
3136 .ident
= XPRT_TRANSPORT_TCP
,
3137 .setup
= xs_setup_tcp
,
3138 .netid
= { "tcp", "tcp6", "" },
3141 static struct xprt_class xs_bc_tcp_transport
= {
3142 .list
= LIST_HEAD_INIT(xs_bc_tcp_transport
.list
),
3143 .name
= "tcp NFSv4.1 backchannel",
3144 .owner
= THIS_MODULE
,
3145 .ident
= XPRT_TRANSPORT_BC_TCP
,
3146 .setup
= xs_setup_bc_tcp
,
3151 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3154 int init_socket_xprt(void)
3156 if (!sunrpc_table_header
)
3157 sunrpc_table_header
= register_sysctl_table(sunrpc_table
);
3159 xprt_register_transport(&xs_local_transport
);
3160 xprt_register_transport(&xs_udp_transport
);
3161 xprt_register_transport(&xs_tcp_transport
);
3162 xprt_register_transport(&xs_bc_tcp_transport
);
3168 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3171 void cleanup_socket_xprt(void)
3173 if (sunrpc_table_header
) {
3174 unregister_sysctl_table(sunrpc_table_header
);
3175 sunrpc_table_header
= NULL
;
3178 xprt_unregister_transport(&xs_local_transport
);
3179 xprt_unregister_transport(&xs_udp_transport
);
3180 xprt_unregister_transport(&xs_tcp_transport
);
3181 xprt_unregister_transport(&xs_bc_tcp_transport
);
3184 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
3186 return param_set_uint_minmax(val
, kp
,
3191 static const struct kernel_param_ops param_ops_portnr
= {
3192 .set
= param_set_portnr
,
3193 .get
= param_get_uint
,
3196 #define param_check_portnr(name, p) \
3197 __param_check(name, p, unsigned int);
3199 module_param_named(min_resvport
, xprt_min_resvport
, portnr
, 0644);
3200 module_param_named(max_resvport
, xprt_max_resvport
, portnr
, 0644);
3202 static int param_set_slot_table_size(const char *val
,
3203 const struct kernel_param
*kp
)
3205 return param_set_uint_minmax(val
, kp
,
3207 RPC_MAX_SLOT_TABLE
);
3210 static const struct kernel_param_ops param_ops_slot_table_size
= {
3211 .set
= param_set_slot_table_size
,
3212 .get
= param_get_uint
,
3215 #define param_check_slot_table_size(name, p) \
3216 __param_check(name, p, unsigned int);
3218 static int param_set_max_slot_table_size(const char *val
,
3219 const struct kernel_param
*kp
)
3221 return param_set_uint_minmax(val
, kp
,
3223 RPC_MAX_SLOT_TABLE_LIMIT
);
3226 static const struct kernel_param_ops param_ops_max_slot_table_size
= {
3227 .set
= param_set_max_slot_table_size
,
3228 .get
= param_get_uint
,
3231 #define param_check_max_slot_table_size(name, p) \
3232 __param_check(name, p, unsigned int);
3234 module_param_named(tcp_slot_table_entries
, xprt_tcp_slot_table_entries
,
3235 slot_table_size
, 0644);
3236 module_param_named(tcp_max_slot_table_entries
, xprt_max_tcp_slot_table_entries
,
3237 max_slot_table_size
, 0644);
3238 module_param_named(udp_slot_table_entries
, xprt_udp_slot_table_entries
,
3239 slot_table_size
, 0644);