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>
52 static void xs_close(struct rpc_xprt
*xprt
);
57 static unsigned int xprt_udp_slot_table_entries
= RPC_DEF_SLOT_TABLE
;
58 static unsigned int xprt_tcp_slot_table_entries
= RPC_MIN_SLOT_TABLE
;
59 static unsigned int xprt_max_tcp_slot_table_entries
= RPC_MAX_SLOT_TABLE
;
61 static unsigned int xprt_min_resvport
= RPC_DEF_MIN_RESVPORT
;
62 static unsigned int xprt_max_resvport
= RPC_DEF_MAX_RESVPORT
;
64 #define XS_TCP_LINGER_TO (15U * HZ)
65 static unsigned int xs_tcp_fin_timeout __read_mostly
= XS_TCP_LINGER_TO
;
68 * We can register our own files under /proc/sys/sunrpc by
69 * calling register_sysctl_table() again. The files in that
70 * directory become the union of all files registered there.
72 * We simply need to make sure that we don't collide with
73 * someone else's file names!
78 static unsigned int min_slot_table_size
= RPC_MIN_SLOT_TABLE
;
79 static unsigned int max_slot_table_size
= RPC_MAX_SLOT_TABLE
;
80 static unsigned int max_tcp_slot_table_limit
= RPC_MAX_SLOT_TABLE_LIMIT
;
81 static unsigned int xprt_min_resvport_limit
= RPC_MIN_RESVPORT
;
82 static unsigned int xprt_max_resvport_limit
= RPC_MAX_RESVPORT
;
84 static struct ctl_table_header
*sunrpc_table_header
;
87 * FIXME: changing the UDP slot table size should also resize the UDP
88 * socket buffers for existing UDP transports
90 static ctl_table xs_tunables_table
[] = {
92 .procname
= "udp_slot_table_entries",
93 .data
= &xprt_udp_slot_table_entries
,
94 .maxlen
= sizeof(unsigned int),
96 .proc_handler
= proc_dointvec_minmax
,
97 .extra1
= &min_slot_table_size
,
98 .extra2
= &max_slot_table_size
101 .procname
= "tcp_slot_table_entries",
102 .data
= &xprt_tcp_slot_table_entries
,
103 .maxlen
= sizeof(unsigned int),
105 .proc_handler
= proc_dointvec_minmax
,
106 .extra1
= &min_slot_table_size
,
107 .extra2
= &max_slot_table_size
110 .procname
= "tcp_max_slot_table_entries",
111 .data
= &xprt_max_tcp_slot_table_entries
,
112 .maxlen
= sizeof(unsigned int),
114 .proc_handler
= proc_dointvec_minmax
,
115 .extra1
= &min_slot_table_size
,
116 .extra2
= &max_tcp_slot_table_limit
119 .procname
= "min_resvport",
120 .data
= &xprt_min_resvport
,
121 .maxlen
= sizeof(unsigned int),
123 .proc_handler
= proc_dointvec_minmax
,
124 .extra1
= &xprt_min_resvport_limit
,
125 .extra2
= &xprt_max_resvport_limit
128 .procname
= "max_resvport",
129 .data
= &xprt_max_resvport
,
130 .maxlen
= sizeof(unsigned int),
132 .proc_handler
= proc_dointvec_minmax
,
133 .extra1
= &xprt_min_resvport_limit
,
134 .extra2
= &xprt_max_resvport_limit
137 .procname
= "tcp_fin_timeout",
138 .data
= &xs_tcp_fin_timeout
,
139 .maxlen
= sizeof(xs_tcp_fin_timeout
),
141 .proc_handler
= proc_dointvec_jiffies
,
146 static ctl_table sunrpc_table
[] = {
148 .procname
= "sunrpc",
150 .child
= xs_tunables_table
158 * Wait duration for a reply from the RPC portmapper.
160 #define XS_BIND_TO (60U * HZ)
163 * Delay if a UDP socket connect error occurs. This is most likely some
164 * kind of resource problem on the local host.
166 #define XS_UDP_REEST_TO (2U * HZ)
169 * The reestablish timeout allows clients to delay for a bit before attempting
170 * to reconnect to a server that just dropped our connection.
172 * We implement an exponential backoff when trying to reestablish a TCP
173 * transport connection with the server. Some servers like to drop a TCP
174 * connection when they are overworked, so we start with a short timeout and
175 * increase over time if the server is down or not responding.
177 #define XS_TCP_INIT_REEST_TO (3U * HZ)
178 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
181 * TCP idle timeout; client drops the transport socket if it is idle
182 * for this long. Note that we also timeout UDP sockets to prevent
183 * holding port numbers when there is no RPC traffic.
185 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
188 # undef RPC_DEBUG_DATA
189 # define RPCDBG_FACILITY RPCDBG_TRANS
192 #ifdef RPC_DEBUG_DATA
193 static void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
195 u8
*buf
= (u8
*) packet
;
198 dprintk("RPC: %s\n", msg
);
199 for (j
= 0; j
< count
&& j
< 128; j
+= 4) {
203 dprintk("0x%04x ", j
);
205 dprintk("%02x%02x%02x%02x ",
206 buf
[j
], buf
[j
+1], buf
[j
+2], buf
[j
+3]);
211 static inline void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
218 struct rpc_xprt xprt
;
223 struct socket
* sock
;
227 * State of TCP reply receive
236 unsigned long tcp_copied
,
240 * Connection of transports
242 struct delayed_work connect_worker
;
243 struct sockaddr_storage srcaddr
;
244 unsigned short srcport
;
247 * UDP socket buffer size parameters
253 * Saved socket callback addresses
255 void (*old_data_ready
)(struct sock
*, int);
256 void (*old_state_change
)(struct sock
*);
257 void (*old_write_space
)(struct sock
*);
261 * TCP receive state flags
263 #define TCP_RCV_LAST_FRAG (1UL << 0)
264 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
265 #define TCP_RCV_COPY_XID (1UL << 2)
266 #define TCP_RCV_COPY_DATA (1UL << 3)
267 #define TCP_RCV_READ_CALLDIR (1UL << 4)
268 #define TCP_RCV_COPY_CALLDIR (1UL << 5)
273 #define TCP_RPC_REPLY (1UL << 6)
275 static inline struct sockaddr
*xs_addr(struct rpc_xprt
*xprt
)
277 return (struct sockaddr
*) &xprt
->addr
;
280 static inline struct sockaddr_un
*xs_addr_un(struct rpc_xprt
*xprt
)
282 return (struct sockaddr_un
*) &xprt
->addr
;
285 static inline struct sockaddr_in
*xs_addr_in(struct rpc_xprt
*xprt
)
287 return (struct sockaddr_in
*) &xprt
->addr
;
290 static inline struct sockaddr_in6
*xs_addr_in6(struct rpc_xprt
*xprt
)
292 return (struct sockaddr_in6
*) &xprt
->addr
;
295 static void xs_format_common_peer_addresses(struct rpc_xprt
*xprt
)
297 struct sockaddr
*sap
= xs_addr(xprt
);
298 struct sockaddr_in6
*sin6
;
299 struct sockaddr_in
*sin
;
300 struct sockaddr_un
*sun
;
303 switch (sap
->sa_family
) {
305 sun
= xs_addr_un(xprt
);
306 strlcpy(buf
, sun
->sun_path
, sizeof(buf
));
307 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
308 kstrdup(buf
, GFP_KERNEL
);
311 (void)rpc_ntop(sap
, buf
, sizeof(buf
));
312 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
313 kstrdup(buf
, GFP_KERNEL
);
314 sin
= xs_addr_in(xprt
);
315 snprintf(buf
, sizeof(buf
), "%08x", ntohl(sin
->sin_addr
.s_addr
));
318 (void)rpc_ntop(sap
, buf
, sizeof(buf
));
319 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
320 kstrdup(buf
, GFP_KERNEL
);
321 sin6
= xs_addr_in6(xprt
);
322 snprintf(buf
, sizeof(buf
), "%pi6", &sin6
->sin6_addr
);
328 xprt
->address_strings
[RPC_DISPLAY_HEX_ADDR
] = kstrdup(buf
, GFP_KERNEL
);
331 static void xs_format_common_peer_ports(struct rpc_xprt
*xprt
)
333 struct sockaddr
*sap
= xs_addr(xprt
);
336 snprintf(buf
, sizeof(buf
), "%u", rpc_get_port(sap
));
337 xprt
->address_strings
[RPC_DISPLAY_PORT
] = kstrdup(buf
, GFP_KERNEL
);
339 snprintf(buf
, sizeof(buf
), "%4hx", rpc_get_port(sap
));
340 xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
] = kstrdup(buf
, GFP_KERNEL
);
343 static void xs_format_peer_addresses(struct rpc_xprt
*xprt
,
344 const char *protocol
,
347 xprt
->address_strings
[RPC_DISPLAY_PROTO
] = protocol
;
348 xprt
->address_strings
[RPC_DISPLAY_NETID
] = netid
;
349 xs_format_common_peer_addresses(xprt
);
350 xs_format_common_peer_ports(xprt
);
353 static void xs_update_peer_port(struct rpc_xprt
*xprt
)
355 kfree(xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
]);
356 kfree(xprt
->address_strings
[RPC_DISPLAY_PORT
]);
358 xs_format_common_peer_ports(xprt
);
361 static void xs_free_peer_addresses(struct rpc_xprt
*xprt
)
365 for (i
= 0; i
< RPC_DISPLAY_MAX
; i
++)
367 case RPC_DISPLAY_PROTO
:
368 case RPC_DISPLAY_NETID
:
371 kfree(xprt
->address_strings
[i
]);
375 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
377 static int xs_send_kvec(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct kvec
*vec
, unsigned int base
, int more
)
379 struct msghdr msg
= {
381 .msg_namelen
= addrlen
,
382 .msg_flags
= XS_SENDMSG_FLAGS
| (more
? MSG_MORE
: 0),
385 .iov_base
= vec
->iov_base
+ base
,
386 .iov_len
= vec
->iov_len
- base
,
389 if (iov
.iov_len
!= 0)
390 return kernel_sendmsg(sock
, &msg
, &iov
, 1, iov
.iov_len
);
391 return kernel_sendmsg(sock
, &msg
, NULL
, 0, 0);
394 static int xs_send_pagedata(struct socket
*sock
, struct xdr_buf
*xdr
, unsigned int base
, int more
, bool zerocopy
)
396 ssize_t (*do_sendpage
)(struct socket
*sock
, struct page
*page
,
397 int offset
, size_t size
, int flags
);
399 unsigned int remainder
;
402 remainder
= xdr
->page_len
- base
;
403 base
+= xdr
->page_base
;
404 ppage
= xdr
->pages
+ (base
>> PAGE_SHIFT
);
406 do_sendpage
= sock
->ops
->sendpage
;
408 do_sendpage
= sock_no_sendpage
;
410 unsigned int len
= min_t(unsigned int, PAGE_SIZE
- base
, remainder
);
411 int flags
= XS_SENDMSG_FLAGS
;
414 if (remainder
!= 0 || more
)
416 err
= do_sendpage(sock
, *ppage
, base
, len
, flags
);
417 if (remainder
== 0 || err
!= len
)
431 * xs_sendpages - write pages directly to a socket
432 * @sock: socket to send on
433 * @addr: UDP only -- address of destination
434 * @addrlen: UDP only -- length of destination address
435 * @xdr: buffer containing this request
436 * @base: starting position in the buffer
437 * @zerocopy: true if it is safe to use sendpage()
440 static int xs_sendpages(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct xdr_buf
*xdr
, unsigned int base
, bool zerocopy
)
442 unsigned int remainder
= xdr
->len
- base
;
448 clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
);
454 if (base
< xdr
->head
[0].iov_len
|| addr
!= NULL
) {
455 unsigned int len
= xdr
->head
[0].iov_len
- base
;
457 err
= xs_send_kvec(sock
, addr
, addrlen
, &xdr
->head
[0], base
, remainder
!= 0);
458 if (remainder
== 0 || err
!= len
)
463 base
-= xdr
->head
[0].iov_len
;
465 if (base
< xdr
->page_len
) {
466 unsigned int len
= xdr
->page_len
- base
;
468 err
= xs_send_pagedata(sock
, xdr
, base
, remainder
!= 0, zerocopy
);
469 if (remainder
== 0 || err
!= len
)
474 base
-= xdr
->page_len
;
476 if (base
>= xdr
->tail
[0].iov_len
)
478 err
= xs_send_kvec(sock
, NULL
, 0, &xdr
->tail
[0], base
, 0);
487 static void xs_nospace_callback(struct rpc_task
*task
)
489 struct sock_xprt
*transport
= container_of(task
->tk_rqstp
->rq_xprt
, struct sock_xprt
, xprt
);
491 transport
->inet
->sk_write_pending
--;
492 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
496 * xs_nospace - place task on wait queue if transmit was incomplete
497 * @task: task to put to sleep
500 static int xs_nospace(struct rpc_task
*task
)
502 struct rpc_rqst
*req
= task
->tk_rqstp
;
503 struct rpc_xprt
*xprt
= req
->rq_xprt
;
504 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
505 struct sock
*sk
= transport
->inet
;
508 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
509 task
->tk_pid
, req
->rq_slen
- req
->rq_bytes_sent
,
512 /* Protect against races with write_space */
513 spin_lock_bh(&xprt
->transport_lock
);
515 /* Don't race with disconnect */
516 if (xprt_connected(xprt
)) {
517 if (test_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
)) {
519 * Notify TCP that we're limited by the application
522 set_bit(SOCK_NOSPACE
, &transport
->sock
->flags
);
523 sk
->sk_write_pending
++;
524 /* ...and wait for more buffer space */
525 xprt_wait_for_buffer_space(task
, xs_nospace_callback
);
528 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
532 spin_unlock_bh(&xprt
->transport_lock
);
534 /* Race breaker in case memory is freed before above code is called */
535 sk
->sk_write_space(sk
);
540 * Construct a stream transport record marker in @buf.
542 static inline void xs_encode_stream_record_marker(struct xdr_buf
*buf
)
544 u32 reclen
= buf
->len
- sizeof(rpc_fraghdr
);
545 rpc_fraghdr
*base
= buf
->head
[0].iov_base
;
546 *base
= cpu_to_be32(RPC_LAST_STREAM_FRAGMENT
| reclen
);
550 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
551 * @task: RPC task that manages the state of an RPC request
554 * 0: The request has been sent
555 * EAGAIN: The socket was blocked, please call again later to
556 * complete the request
557 * ENOTCONN: Caller needs to invoke connect logic then call again
558 * other: Some other error occured, the request was not sent
560 static int xs_local_send_request(struct rpc_task
*task
)
562 struct rpc_rqst
*req
= task
->tk_rqstp
;
563 struct rpc_xprt
*xprt
= req
->rq_xprt
;
564 struct sock_xprt
*transport
=
565 container_of(xprt
, struct sock_xprt
, xprt
);
566 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
569 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
571 xs_pktdump("packet data:",
572 req
->rq_svec
->iov_base
, req
->rq_svec
->iov_len
);
574 status
= xs_sendpages(transport
->sock
, NULL
, 0,
575 xdr
, req
->rq_bytes_sent
, true);
576 dprintk("RPC: %s(%u) = %d\n",
577 __func__
, xdr
->len
- req
->rq_bytes_sent
, status
);
578 if (likely(status
>= 0)) {
579 req
->rq_bytes_sent
+= status
;
580 req
->rq_xmit_bytes_sent
+= status
;
581 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
582 req
->rq_bytes_sent
= 0;
590 status
= xs_nospace(task
);
593 dprintk("RPC: sendmsg returned unrecognized error %d\n",
604 * xs_udp_send_request - write an RPC request to a UDP socket
605 * @task: address of RPC task that manages the state of an RPC request
608 * 0: The request has been sent
609 * EAGAIN: The socket was blocked, please call again later to
610 * complete the request
611 * ENOTCONN: Caller needs to invoke connect logic then call again
612 * other: Some other error occurred, the request was not sent
614 static int xs_udp_send_request(struct rpc_task
*task
)
616 struct rpc_rqst
*req
= task
->tk_rqstp
;
617 struct rpc_xprt
*xprt
= req
->rq_xprt
;
618 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
619 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
622 xs_pktdump("packet data:",
623 req
->rq_svec
->iov_base
,
624 req
->rq_svec
->iov_len
);
626 if (!xprt_bound(xprt
))
628 status
= xs_sendpages(transport
->sock
,
631 req
->rq_bytes_sent
, true);
633 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
634 xdr
->len
- req
->rq_bytes_sent
, status
);
637 req
->rq_xmit_bytes_sent
+= status
;
638 if (status
>= req
->rq_slen
)
640 /* Still some bytes left; set up for a retry later. */
647 /* Should we call xs_close() here? */
650 status
= xs_nospace(task
);
653 dprintk("RPC: sendmsg returned unrecognized error %d\n",
658 /* When the server has died, an ICMP port unreachable message
659 * prompts ECONNREFUSED. */
660 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
667 * xs_tcp_shutdown - gracefully shut down a TCP socket
670 * Initiates a graceful shutdown of the TCP socket by calling the
671 * equivalent of shutdown(SHUT_WR);
673 static void xs_tcp_shutdown(struct rpc_xprt
*xprt
)
675 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
676 struct socket
*sock
= transport
->sock
;
679 kernel_sock_shutdown(sock
, SHUT_WR
);
683 * xs_tcp_send_request - write an RPC request to a TCP socket
684 * @task: address of RPC task that manages the state of an RPC request
687 * 0: The request has been sent
688 * EAGAIN: The socket was blocked, please call again later to
689 * complete the request
690 * ENOTCONN: Caller needs to invoke connect logic then call again
691 * other: Some other error occurred, the request was not sent
693 * XXX: In the case of soft timeouts, should we eventually give up
694 * if sendmsg is not able to make progress?
696 static int xs_tcp_send_request(struct rpc_task
*task
)
698 struct rpc_rqst
*req
= task
->tk_rqstp
;
699 struct rpc_xprt
*xprt
= req
->rq_xprt
;
700 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
701 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
702 bool zerocopy
= true;
705 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
707 xs_pktdump("packet data:",
708 req
->rq_svec
->iov_base
,
709 req
->rq_svec
->iov_len
);
710 /* Don't use zero copy if this is a resend. If the RPC call
711 * completes while the socket holds a reference to the pages,
712 * then we may end up resending corrupted data.
714 if (task
->tk_flags
& RPC_TASK_SENT
)
717 /* Continue transmitting the packet/record. We must be careful
718 * to cope with writespace callbacks arriving _after_ we have
719 * called sendmsg(). */
721 status
= xs_sendpages(transport
->sock
,
722 NULL
, 0, xdr
, req
->rq_bytes_sent
,
725 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
726 xdr
->len
- req
->rq_bytes_sent
, status
);
728 if (unlikely(status
< 0))
731 /* If we've sent the entire packet, immediately
732 * reset the count of bytes sent. */
733 req
->rq_bytes_sent
+= status
;
734 req
->rq_xmit_bytes_sent
+= status
;
735 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
736 req
->rq_bytes_sent
= 0;
749 /* Should we call xs_close() here? */
752 status
= xs_nospace(task
);
755 dprintk("RPC: sendmsg returned unrecognized error %d\n",
758 xs_tcp_shutdown(xprt
);
762 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
769 * xs_tcp_release_xprt - clean up after a tcp transmission
773 * This cleans up if an error causes us to abort the transmission of a request.
774 * In this case, the socket may need to be reset in order to avoid confusing
777 static void xs_tcp_release_xprt(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
779 struct rpc_rqst
*req
;
781 if (task
!= xprt
->snd_task
)
785 req
= task
->tk_rqstp
;
788 if (req
->rq_bytes_sent
== 0)
790 if (req
->rq_bytes_sent
== req
->rq_snd_buf
.len
)
792 set_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
794 xprt_release_xprt(xprt
, task
);
797 static void xs_save_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
799 transport
->old_data_ready
= sk
->sk_data_ready
;
800 transport
->old_state_change
= sk
->sk_state_change
;
801 transport
->old_write_space
= sk
->sk_write_space
;
804 static void xs_restore_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
806 sk
->sk_data_ready
= transport
->old_data_ready
;
807 sk
->sk_state_change
= transport
->old_state_change
;
808 sk
->sk_write_space
= transport
->old_write_space
;
811 static void xs_reset_transport(struct sock_xprt
*transport
)
813 struct socket
*sock
= transport
->sock
;
814 struct sock
*sk
= transport
->inet
;
819 transport
->srcport
= 0;
821 write_lock_bh(&sk
->sk_callback_lock
);
822 transport
->inet
= NULL
;
823 transport
->sock
= NULL
;
825 sk
->sk_user_data
= NULL
;
827 xs_restore_old_callbacks(transport
, sk
);
828 write_unlock_bh(&sk
->sk_callback_lock
);
836 * xs_close - close a socket
839 * This is used when all requests are complete; ie, no DRC state remains
840 * on the server we want to save.
842 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
843 * xs_reset_transport() zeroing the socket from underneath a writer.
845 static void xs_close(struct rpc_xprt
*xprt
)
847 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
849 dprintk("RPC: xs_close xprt %p\n", xprt
);
851 xs_reset_transport(transport
);
852 xprt
->reestablish_timeout
= 0;
854 smp_mb__before_clear_bit();
855 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
856 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
857 clear_bit(XPRT_CLOSING
, &xprt
->state
);
858 smp_mb__after_clear_bit();
859 xprt_disconnect_done(xprt
);
862 static void xs_tcp_close(struct rpc_xprt
*xprt
)
864 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
))
867 xs_tcp_shutdown(xprt
);
870 static void xs_local_destroy(struct rpc_xprt
*xprt
)
873 xs_free_peer_addresses(xprt
);
875 module_put(THIS_MODULE
);
879 * xs_destroy - prepare to shutdown a transport
880 * @xprt: doomed transport
883 static void xs_destroy(struct rpc_xprt
*xprt
)
885 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
887 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
889 cancel_delayed_work_sync(&transport
->connect_worker
);
891 xs_local_destroy(xprt
);
894 static inline struct rpc_xprt
*xprt_from_sock(struct sock
*sk
)
896 return (struct rpc_xprt
*) sk
->sk_user_data
;
899 static int xs_local_copy_to_xdr(struct xdr_buf
*xdr
, struct sk_buff
*skb
)
901 struct xdr_skb_reader desc
= {
903 .offset
= sizeof(rpc_fraghdr
),
904 .count
= skb
->len
- sizeof(rpc_fraghdr
),
907 if (xdr_partial_copy_from_skb(xdr
, 0, &desc
, xdr_skb_read_bits
) < 0)
915 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
916 * @sk: socket with data to read
917 * @len: how much data to read
919 * Currently this assumes we can read the whole reply in a single gulp.
921 static void xs_local_data_ready(struct sock
*sk
, int len
)
923 struct rpc_task
*task
;
924 struct rpc_xprt
*xprt
;
925 struct rpc_rqst
*rovr
;
927 int err
, repsize
, copied
;
931 read_lock_bh(&sk
->sk_callback_lock
);
932 dprintk("RPC: %s...\n", __func__
);
933 xprt
= xprt_from_sock(sk
);
937 skb
= skb_recv_datagram(sk
, 0, 1, &err
);
941 repsize
= skb
->len
- sizeof(rpc_fraghdr
);
943 dprintk("RPC: impossible RPC reply size %d\n", repsize
);
947 /* Copy the XID from the skb... */
948 xp
= skb_header_pointer(skb
, sizeof(rpc_fraghdr
), sizeof(_xid
), &_xid
);
952 /* Look up and lock the request corresponding to the given XID */
953 spin_lock(&xprt
->transport_lock
);
954 rovr
= xprt_lookup_rqst(xprt
, *xp
);
957 task
= rovr
->rq_task
;
959 copied
= rovr
->rq_private_buf
.buflen
;
960 if (copied
> repsize
)
963 if (xs_local_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
964 dprintk("RPC: sk_buff copy failed\n");
968 xprt_complete_rqst(task
, copied
);
971 spin_unlock(&xprt
->transport_lock
);
973 skb_free_datagram(sk
, skb
);
975 read_unlock_bh(&sk
->sk_callback_lock
);
979 * xs_udp_data_ready - "data ready" callback for UDP sockets
980 * @sk: socket with data to read
981 * @len: how much data to read
984 static void xs_udp_data_ready(struct sock
*sk
, int len
)
986 struct rpc_task
*task
;
987 struct rpc_xprt
*xprt
;
988 struct rpc_rqst
*rovr
;
990 int err
, repsize
, copied
;
994 read_lock_bh(&sk
->sk_callback_lock
);
995 dprintk("RPC: xs_udp_data_ready...\n");
996 if (!(xprt
= xprt_from_sock(sk
)))
999 if ((skb
= skb_recv_datagram(sk
, 0, 1, &err
)) == NULL
)
1002 repsize
= skb
->len
- sizeof(struct udphdr
);
1004 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
1008 /* Copy the XID from the skb... */
1009 xp
= skb_header_pointer(skb
, sizeof(struct udphdr
),
1010 sizeof(_xid
), &_xid
);
1014 /* Look up and lock the request corresponding to the given XID */
1015 spin_lock(&xprt
->transport_lock
);
1016 rovr
= xprt_lookup_rqst(xprt
, *xp
);
1019 task
= rovr
->rq_task
;
1021 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
1024 /* Suck it into the iovec, verify checksum if not done by hw. */
1025 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
1026 UDPX_INC_STATS_BH(sk
, UDP_MIB_INERRORS
);
1030 UDPX_INC_STATS_BH(sk
, UDP_MIB_INDATAGRAMS
);
1032 xprt_adjust_cwnd(xprt
, task
, copied
);
1033 xprt_complete_rqst(task
, copied
);
1036 spin_unlock(&xprt
->transport_lock
);
1038 skb_free_datagram(sk
, skb
);
1040 read_unlock_bh(&sk
->sk_callback_lock
);
1044 * Helper function to force a TCP close if the server is sending
1045 * junk and/or it has put us in CLOSE_WAIT
1047 static void xs_tcp_force_close(struct rpc_xprt
*xprt
)
1049 set_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
);
1050 xprt_force_disconnect(xprt
);
1053 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
1055 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1059 p
= ((char *) &transport
->tcp_fraghdr
) + transport
->tcp_offset
;
1060 len
= sizeof(transport
->tcp_fraghdr
) - transport
->tcp_offset
;
1061 used
= xdr_skb_read_bits(desc
, p
, len
);
1062 transport
->tcp_offset
+= used
;
1066 transport
->tcp_reclen
= ntohl(transport
->tcp_fraghdr
);
1067 if (transport
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
1068 transport
->tcp_flags
|= TCP_RCV_LAST_FRAG
;
1070 transport
->tcp_flags
&= ~TCP_RCV_LAST_FRAG
;
1071 transport
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
1073 transport
->tcp_flags
&= ~TCP_RCV_COPY_FRAGHDR
;
1074 transport
->tcp_offset
= 0;
1076 /* Sanity check of the record length */
1077 if (unlikely(transport
->tcp_reclen
< 8)) {
1078 dprintk("RPC: invalid TCP record fragment length\n");
1079 xs_tcp_force_close(xprt
);
1082 dprintk("RPC: reading TCP record fragment of length %d\n",
1083 transport
->tcp_reclen
);
1086 static void xs_tcp_check_fraghdr(struct sock_xprt
*transport
)
1088 if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1089 transport
->tcp_flags
|= TCP_RCV_COPY_FRAGHDR
;
1090 transport
->tcp_offset
= 0;
1091 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
) {
1092 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1093 transport
->tcp_flags
|= TCP_RCV_COPY_XID
;
1094 transport
->tcp_copied
= 0;
1099 static inline void xs_tcp_read_xid(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1104 len
= sizeof(transport
->tcp_xid
) - transport
->tcp_offset
;
1105 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
1106 p
= ((char *) &transport
->tcp_xid
) + transport
->tcp_offset
;
1107 used
= xdr_skb_read_bits(desc
, p
, len
);
1108 transport
->tcp_offset
+= used
;
1111 transport
->tcp_flags
&= ~TCP_RCV_COPY_XID
;
1112 transport
->tcp_flags
|= TCP_RCV_READ_CALLDIR
;
1113 transport
->tcp_copied
= 4;
1114 dprintk("RPC: reading %s XID %08x\n",
1115 (transport
->tcp_flags
& TCP_RPC_REPLY
) ? "reply for"
1117 ntohl(transport
->tcp_xid
));
1118 xs_tcp_check_fraghdr(transport
);
1121 static inline void xs_tcp_read_calldir(struct sock_xprt
*transport
,
1122 struct xdr_skb_reader
*desc
)
1129 * We want transport->tcp_offset to be 8 at the end of this routine
1130 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1131 * When this function is called for the first time,
1132 * transport->tcp_offset is 4 (after having already read the xid).
1134 offset
= transport
->tcp_offset
- sizeof(transport
->tcp_xid
);
1135 len
= sizeof(transport
->tcp_calldir
) - offset
;
1136 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len
);
1137 p
= ((char *) &transport
->tcp_calldir
) + offset
;
1138 used
= xdr_skb_read_bits(desc
, p
, len
);
1139 transport
->tcp_offset
+= used
;
1142 transport
->tcp_flags
&= ~TCP_RCV_READ_CALLDIR
;
1144 * We don't yet have the XDR buffer, so we will write the calldir
1145 * out after we get the buffer from the 'struct rpc_rqst'
1147 switch (ntohl(transport
->tcp_calldir
)) {
1149 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1150 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1151 transport
->tcp_flags
|= TCP_RPC_REPLY
;
1154 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1155 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1156 transport
->tcp_flags
&= ~TCP_RPC_REPLY
;
1159 dprintk("RPC: invalid request message type\n");
1160 xs_tcp_force_close(&transport
->xprt
);
1162 xs_tcp_check_fraghdr(transport
);
1165 static inline void xs_tcp_read_common(struct rpc_xprt
*xprt
,
1166 struct xdr_skb_reader
*desc
,
1167 struct rpc_rqst
*req
)
1169 struct sock_xprt
*transport
=
1170 container_of(xprt
, struct sock_xprt
, xprt
);
1171 struct xdr_buf
*rcvbuf
;
1175 rcvbuf
= &req
->rq_private_buf
;
1177 if (transport
->tcp_flags
& TCP_RCV_COPY_CALLDIR
) {
1179 * Save the RPC direction in the XDR buffer
1181 memcpy(rcvbuf
->head
[0].iov_base
+ transport
->tcp_copied
,
1182 &transport
->tcp_calldir
,
1183 sizeof(transport
->tcp_calldir
));
1184 transport
->tcp_copied
+= sizeof(transport
->tcp_calldir
);
1185 transport
->tcp_flags
&= ~TCP_RCV_COPY_CALLDIR
;
1189 if (len
> transport
->tcp_reclen
- transport
->tcp_offset
) {
1190 struct xdr_skb_reader my_desc
;
1192 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1193 memcpy(&my_desc
, desc
, sizeof(my_desc
));
1194 my_desc
.count
= len
;
1195 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1196 &my_desc
, xdr_skb_read_bits
);
1200 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1201 desc
, xdr_skb_read_bits
);
1204 transport
->tcp_copied
+= r
;
1205 transport
->tcp_offset
+= r
;
1208 /* Error when copying to the receive buffer,
1209 * usually because we weren't able to allocate
1210 * additional buffer pages. All we can do now
1211 * is turn off TCP_RCV_COPY_DATA, so the request
1212 * will not receive any additional updates,
1214 * Any remaining data from this record will
1217 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1218 dprintk("RPC: XID %08x truncated request\n",
1219 ntohl(transport
->tcp_xid
));
1220 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1221 "tcp_offset = %u, tcp_reclen = %u\n",
1222 xprt
, transport
->tcp_copied
,
1223 transport
->tcp_offset
, transport
->tcp_reclen
);
1227 dprintk("RPC: XID %08x read %Zd bytes\n",
1228 ntohl(transport
->tcp_xid
), r
);
1229 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1230 "tcp_reclen = %u\n", xprt
, transport
->tcp_copied
,
1231 transport
->tcp_offset
, transport
->tcp_reclen
);
1233 if (transport
->tcp_copied
== req
->rq_private_buf
.buflen
)
1234 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1235 else if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1236 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
)
1237 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1242 * Finds the request corresponding to the RPC xid and invokes the common
1243 * tcp read code to read the data.
1245 static inline int xs_tcp_read_reply(struct rpc_xprt
*xprt
,
1246 struct xdr_skb_reader
*desc
)
1248 struct sock_xprt
*transport
=
1249 container_of(xprt
, struct sock_xprt
, xprt
);
1250 struct rpc_rqst
*req
;
1252 dprintk("RPC: read reply XID %08x\n", ntohl(transport
->tcp_xid
));
1254 /* Find and lock the request corresponding to this xid */
1255 spin_lock(&xprt
->transport_lock
);
1256 req
= xprt_lookup_rqst(xprt
, transport
->tcp_xid
);
1258 dprintk("RPC: XID %08x request not found!\n",
1259 ntohl(transport
->tcp_xid
));
1260 spin_unlock(&xprt
->transport_lock
);
1264 xs_tcp_read_common(xprt
, desc
, req
);
1266 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1267 xprt_complete_rqst(req
->rq_task
, transport
->tcp_copied
);
1269 spin_unlock(&xprt
->transport_lock
);
1273 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1275 * Obtains an rpc_rqst previously allocated and invokes the common
1276 * tcp read code to read the data. The result is placed in the callback
1278 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1279 * connection and return -1.
1281 static inline int xs_tcp_read_callback(struct rpc_xprt
*xprt
,
1282 struct xdr_skb_reader
*desc
)
1284 struct sock_xprt
*transport
=
1285 container_of(xprt
, struct sock_xprt
, xprt
);
1286 struct rpc_rqst
*req
;
1288 req
= xprt_alloc_bc_request(xprt
);
1290 printk(KERN_WARNING
"Callback slot table overflowed\n");
1291 xprt_force_disconnect(xprt
);
1295 req
->rq_xid
= transport
->tcp_xid
;
1296 dprintk("RPC: read callback XID %08x\n", ntohl(req
->rq_xid
));
1297 xs_tcp_read_common(xprt
, desc
, req
);
1299 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
)) {
1300 struct svc_serv
*bc_serv
= xprt
->bc_serv
;
1303 * Add callback request to callback list. The callback
1304 * service sleeps on the sv_cb_waitq waiting for new
1305 * requests. Wake it up after adding enqueing the
1308 dprintk("RPC: add callback request to list\n");
1309 spin_lock(&bc_serv
->sv_cb_lock
);
1310 list_add(&req
->rq_bc_list
, &bc_serv
->sv_cb_list
);
1311 spin_unlock(&bc_serv
->sv_cb_lock
);
1312 wake_up(&bc_serv
->sv_cb_waitq
);
1315 req
->rq_private_buf
.len
= transport
->tcp_copied
;
1320 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1321 struct xdr_skb_reader
*desc
)
1323 struct sock_xprt
*transport
=
1324 container_of(xprt
, struct sock_xprt
, xprt
);
1326 return (transport
->tcp_flags
& TCP_RPC_REPLY
) ?
1327 xs_tcp_read_reply(xprt
, desc
) :
1328 xs_tcp_read_callback(xprt
, desc
);
1331 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1332 struct xdr_skb_reader
*desc
)
1334 return xs_tcp_read_reply(xprt
, desc
);
1336 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1339 * Read data off the transport. This can be either an RPC_CALL or an
1340 * RPC_REPLY. Relay the processing to helper functions.
1342 static void xs_tcp_read_data(struct rpc_xprt
*xprt
,
1343 struct xdr_skb_reader
*desc
)
1345 struct sock_xprt
*transport
=
1346 container_of(xprt
, struct sock_xprt
, xprt
);
1348 if (_xs_tcp_read_data(xprt
, desc
) == 0)
1349 xs_tcp_check_fraghdr(transport
);
1352 * The transport_lock protects the request handling.
1353 * There's no need to hold it to update the tcp_flags.
1355 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1359 static inline void xs_tcp_read_discard(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1363 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1364 if (len
> desc
->count
)
1367 desc
->offset
+= len
;
1368 transport
->tcp_offset
+= len
;
1369 dprintk("RPC: discarded %Zu bytes\n", len
);
1370 xs_tcp_check_fraghdr(transport
);
1373 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
1375 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
1376 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1377 struct xdr_skb_reader desc
= {
1383 dprintk("RPC: xs_tcp_data_recv started\n");
1385 /* Read in a new fragment marker if necessary */
1386 /* Can we ever really expect to get completely empty fragments? */
1387 if (transport
->tcp_flags
& TCP_RCV_COPY_FRAGHDR
) {
1388 xs_tcp_read_fraghdr(xprt
, &desc
);
1391 /* Read in the xid if necessary */
1392 if (transport
->tcp_flags
& TCP_RCV_COPY_XID
) {
1393 xs_tcp_read_xid(transport
, &desc
);
1396 /* Read in the call/reply flag */
1397 if (transport
->tcp_flags
& TCP_RCV_READ_CALLDIR
) {
1398 xs_tcp_read_calldir(transport
, &desc
);
1401 /* Read in the request data */
1402 if (transport
->tcp_flags
& TCP_RCV_COPY_DATA
) {
1403 xs_tcp_read_data(xprt
, &desc
);
1406 /* Skip over any trailing bytes on short reads */
1407 xs_tcp_read_discard(transport
, &desc
);
1408 } while (desc
.count
);
1409 dprintk("RPC: xs_tcp_data_recv done\n");
1410 return len
- desc
.count
;
1414 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1415 * @sk: socket with data to read
1416 * @bytes: how much data to read
1419 static void xs_tcp_data_ready(struct sock
*sk
, int bytes
)
1421 struct rpc_xprt
*xprt
;
1422 read_descriptor_t rd_desc
;
1425 dprintk("RPC: xs_tcp_data_ready...\n");
1427 read_lock_bh(&sk
->sk_callback_lock
);
1428 if (!(xprt
= xprt_from_sock(sk
)))
1430 /* Any data means we had a useful conversation, so
1431 * the we don't need to delay the next reconnect
1433 if (xprt
->reestablish_timeout
)
1434 xprt
->reestablish_timeout
= 0;
1436 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1437 rd_desc
.arg
.data
= xprt
;
1439 rd_desc
.count
= 65536;
1440 read
= tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
1443 read_unlock_bh(&sk
->sk_callback_lock
);
1447 * Do the equivalent of linger/linger2 handling for dealing with
1448 * broken servers that don't close the socket in a timely
1451 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt
*xprt
,
1452 unsigned long timeout
)
1454 struct sock_xprt
*transport
;
1456 if (xprt_test_and_set_connecting(xprt
))
1458 set_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1459 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1460 queue_delayed_work(rpciod_workqueue
, &transport
->connect_worker
,
1464 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt
*xprt
)
1466 struct sock_xprt
*transport
;
1468 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1470 if (!test_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
) ||
1471 !cancel_delayed_work(&transport
->connect_worker
))
1473 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1474 xprt_clear_connecting(xprt
);
1477 static void xs_sock_reset_connection_flags(struct rpc_xprt
*xprt
)
1479 smp_mb__before_clear_bit();
1480 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1481 clear_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
);
1482 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1483 clear_bit(XPRT_CLOSING
, &xprt
->state
);
1484 smp_mb__after_clear_bit();
1487 static void xs_sock_mark_closed(struct rpc_xprt
*xprt
)
1489 xs_sock_reset_connection_flags(xprt
);
1490 /* Mark transport as closed and wake up all pending tasks */
1491 xprt_disconnect_done(xprt
);
1495 * xs_tcp_state_change - callback to handle TCP socket state changes
1496 * @sk: socket whose state has changed
1499 static void xs_tcp_state_change(struct sock
*sk
)
1501 struct rpc_xprt
*xprt
;
1503 read_lock_bh(&sk
->sk_callback_lock
);
1504 if (!(xprt
= xprt_from_sock(sk
)))
1506 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
1507 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1508 sk
->sk_state
, xprt_connected(xprt
),
1509 sock_flag(sk
, SOCK_DEAD
),
1510 sock_flag(sk
, SOCK_ZAPPED
),
1513 switch (sk
->sk_state
) {
1514 case TCP_ESTABLISHED
:
1515 spin_lock(&xprt
->transport_lock
);
1516 if (!xprt_test_and_set_connected(xprt
)) {
1517 struct sock_xprt
*transport
= container_of(xprt
,
1518 struct sock_xprt
, xprt
);
1520 /* Reset TCP record info */
1521 transport
->tcp_offset
= 0;
1522 transport
->tcp_reclen
= 0;
1523 transport
->tcp_copied
= 0;
1524 transport
->tcp_flags
=
1525 TCP_RCV_COPY_FRAGHDR
| TCP_RCV_COPY_XID
;
1527 xprt_wake_pending_tasks(xprt
, -EAGAIN
);
1529 spin_unlock(&xprt
->transport_lock
);
1532 /* The client initiated a shutdown of the socket */
1533 xprt
->connect_cookie
++;
1534 xprt
->reestablish_timeout
= 0;
1535 set_bit(XPRT_CLOSING
, &xprt
->state
);
1536 smp_mb__before_clear_bit();
1537 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1538 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1539 smp_mb__after_clear_bit();
1540 xs_tcp_schedule_linger_timeout(xprt
, xs_tcp_fin_timeout
);
1542 case TCP_CLOSE_WAIT
:
1543 /* The server initiated a shutdown of the socket */
1544 xprt
->connect_cookie
++;
1545 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1546 xs_tcp_force_close(xprt
);
1549 * If the server closed down the connection, make sure that
1550 * we back off before reconnecting
1552 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
1553 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1556 set_bit(XPRT_CLOSING
, &xprt
->state
);
1557 xs_tcp_schedule_linger_timeout(xprt
, xs_tcp_fin_timeout
);
1558 smp_mb__before_clear_bit();
1559 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1560 smp_mb__after_clear_bit();
1563 xs_tcp_cancel_linger_timeout(xprt
);
1564 xs_sock_mark_closed(xprt
);
1567 read_unlock_bh(&sk
->sk_callback_lock
);
1570 static void xs_write_space(struct sock
*sk
)
1572 struct socket
*sock
;
1573 struct rpc_xprt
*xprt
;
1575 if (unlikely(!(sock
= sk
->sk_socket
)))
1577 clear_bit(SOCK_NOSPACE
, &sock
->flags
);
1579 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1581 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
) == 0)
1584 xprt_write_space(xprt
);
1588 * xs_udp_write_space - callback invoked when socket buffer space
1590 * @sk: socket whose state has changed
1592 * Called when more output buffer space is available for this socket.
1593 * We try not to wake our writers until they can make "significant"
1594 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1595 * with a bunch of small requests.
1597 static void xs_udp_write_space(struct sock
*sk
)
1599 read_lock_bh(&sk
->sk_callback_lock
);
1601 /* from net/core/sock.c:sock_def_write_space */
1602 if (sock_writeable(sk
))
1605 read_unlock_bh(&sk
->sk_callback_lock
);
1609 * xs_tcp_write_space - callback invoked when socket buffer space
1611 * @sk: socket whose state has changed
1613 * Called when more output buffer space is available for this socket.
1614 * We try not to wake our writers until they can make "significant"
1615 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1616 * with a bunch of small requests.
1618 static void xs_tcp_write_space(struct sock
*sk
)
1620 read_lock_bh(&sk
->sk_callback_lock
);
1622 /* from net/core/stream.c:sk_stream_write_space */
1623 if (sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
))
1626 read_unlock_bh(&sk
->sk_callback_lock
);
1629 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1631 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1632 struct sock
*sk
= transport
->inet
;
1634 if (transport
->rcvsize
) {
1635 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1636 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1638 if (transport
->sndsize
) {
1639 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1640 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1641 sk
->sk_write_space(sk
);
1646 * xs_udp_set_buffer_size - set send and receive limits
1647 * @xprt: generic transport
1648 * @sndsize: requested size of send buffer, in bytes
1649 * @rcvsize: requested size of receive buffer, in bytes
1651 * Set socket send and receive buffer size limits.
1653 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1655 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1657 transport
->sndsize
= 0;
1659 transport
->sndsize
= sndsize
+ 1024;
1660 transport
->rcvsize
= 0;
1662 transport
->rcvsize
= rcvsize
+ 1024;
1664 xs_udp_do_set_buffer_size(xprt
);
1668 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1669 * @task: task that timed out
1671 * Adjust the congestion window after a retransmit timeout has occurred.
1673 static void xs_udp_timer(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1675 xprt_adjust_cwnd(xprt
, task
, -ETIMEDOUT
);
1678 static unsigned short xs_get_random_port(void)
1680 unsigned short range
= xprt_max_resvport
- xprt_min_resvport
;
1681 unsigned short rand
= (unsigned short) net_random() % range
;
1682 return rand
+ xprt_min_resvport
;
1686 * xs_set_port - reset the port number in the remote endpoint address
1687 * @xprt: generic transport
1688 * @port: new port number
1691 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1693 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1695 rpc_set_port(xs_addr(xprt
), port
);
1696 xs_update_peer_port(xprt
);
1699 static unsigned short xs_get_srcport(struct sock_xprt
*transport
)
1701 unsigned short port
= transport
->srcport
;
1703 if (port
== 0 && transport
->xprt
.resvport
)
1704 port
= xs_get_random_port();
1708 static unsigned short xs_next_srcport(struct sock_xprt
*transport
, unsigned short port
)
1710 if (transport
->srcport
!= 0)
1711 transport
->srcport
= 0;
1712 if (!transport
->xprt
.resvport
)
1714 if (port
<= xprt_min_resvport
|| port
> xprt_max_resvport
)
1715 return xprt_max_resvport
;
1718 static int xs_bind(struct sock_xprt
*transport
, struct socket
*sock
)
1720 struct sockaddr_storage myaddr
;
1722 unsigned short port
= xs_get_srcport(transport
);
1723 unsigned short last
;
1725 memcpy(&myaddr
, &transport
->srcaddr
, transport
->xprt
.addrlen
);
1727 rpc_set_port((struct sockaddr
*)&myaddr
, port
);
1728 err
= kernel_bind(sock
, (struct sockaddr
*)&myaddr
,
1729 transport
->xprt
.addrlen
);
1733 transport
->srcport
= port
;
1737 port
= xs_next_srcport(transport
, port
);
1740 } while (err
== -EADDRINUSE
&& nloop
!= 2);
1742 if (myaddr
.ss_family
== AF_INET
)
1743 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__
,
1744 &((struct sockaddr_in
*)&myaddr
)->sin_addr
,
1745 port
, err
? "failed" : "ok", err
);
1747 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__
,
1748 &((struct sockaddr_in6
*)&myaddr
)->sin6_addr
,
1749 port
, err
? "failed" : "ok", err
);
1754 * We don't support autobind on AF_LOCAL sockets
1756 static void xs_local_rpcbind(struct rpc_task
*task
)
1759 xprt_set_bound(rcu_dereference(task
->tk_client
->cl_xprt
));
1763 static void xs_local_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1767 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1768 static struct lock_class_key xs_key
[2];
1769 static struct lock_class_key xs_slock_key
[2];
1771 static inline void xs_reclassify_socketu(struct socket
*sock
)
1773 struct sock
*sk
= sock
->sk
;
1775 sock_lock_init_class_and_name(sk
, "slock-AF_LOCAL-RPC",
1776 &xs_slock_key
[1], "sk_lock-AF_LOCAL-RPC", &xs_key
[1]);
1779 static inline void xs_reclassify_socket4(struct socket
*sock
)
1781 struct sock
*sk
= sock
->sk
;
1783 sock_lock_init_class_and_name(sk
, "slock-AF_INET-RPC",
1784 &xs_slock_key
[0], "sk_lock-AF_INET-RPC", &xs_key
[0]);
1787 static inline void xs_reclassify_socket6(struct socket
*sock
)
1789 struct sock
*sk
= sock
->sk
;
1791 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-RPC",
1792 &xs_slock_key
[1], "sk_lock-AF_INET6-RPC", &xs_key
[1]);
1795 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1797 WARN_ON_ONCE(sock_owned_by_user(sock
->sk
));
1798 if (sock_owned_by_user(sock
->sk
))
1803 xs_reclassify_socketu(sock
);
1806 xs_reclassify_socket4(sock
);
1809 xs_reclassify_socket6(sock
);
1814 static inline void xs_reclassify_socketu(struct socket
*sock
)
1818 static inline void xs_reclassify_socket4(struct socket
*sock
)
1822 static inline void xs_reclassify_socket6(struct socket
*sock
)
1826 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1831 static struct socket
*xs_create_sock(struct rpc_xprt
*xprt
,
1832 struct sock_xprt
*transport
, int family
, int type
, int protocol
)
1834 struct socket
*sock
;
1837 err
= __sock_create(xprt
->xprt_net
, family
, type
, protocol
, &sock
, 1);
1839 dprintk("RPC: can't create %d transport socket (%d).\n",
1843 xs_reclassify_socket(family
, sock
);
1845 err
= xs_bind(transport
, sock
);
1853 return ERR_PTR(err
);
1856 static int xs_local_finish_connecting(struct rpc_xprt
*xprt
,
1857 struct socket
*sock
)
1859 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1862 if (!transport
->inet
) {
1863 struct sock
*sk
= sock
->sk
;
1865 write_lock_bh(&sk
->sk_callback_lock
);
1867 xs_save_old_callbacks(transport
, sk
);
1869 sk
->sk_user_data
= xprt
;
1870 sk
->sk_data_ready
= xs_local_data_ready
;
1871 sk
->sk_write_space
= xs_udp_write_space
;
1872 sk
->sk_allocation
= GFP_ATOMIC
;
1874 xprt_clear_connected(xprt
);
1876 /* Reset to new socket */
1877 transport
->sock
= sock
;
1878 transport
->inet
= sk
;
1880 write_unlock_bh(&sk
->sk_callback_lock
);
1883 /* Tell the socket layer to start connecting... */
1884 xprt
->stat
.connect_count
++;
1885 xprt
->stat
.connect_start
= jiffies
;
1886 return kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, 0);
1890 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1891 * @xprt: RPC transport to connect
1892 * @transport: socket transport to connect
1893 * @create_sock: function to create a socket of the correct type
1895 static int xs_local_setup_socket(struct sock_xprt
*transport
)
1897 struct rpc_xprt
*xprt
= &transport
->xprt
;
1898 struct socket
*sock
;
1901 current
->flags
|= PF_FSTRANS
;
1903 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1904 status
= __sock_create(xprt
->xprt_net
, AF_LOCAL
,
1905 SOCK_STREAM
, 0, &sock
, 1);
1907 dprintk("RPC: can't create AF_LOCAL "
1908 "transport socket (%d).\n", -status
);
1911 xs_reclassify_socketu(sock
);
1913 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1914 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1916 status
= xs_local_finish_connecting(xprt
, sock
);
1919 dprintk("RPC: xprt %p connected to %s\n",
1920 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1921 xprt_set_connected(xprt
);
1924 dprintk("RPC: xprt %p: socket %s does not exist\n",
1925 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1928 dprintk("RPC: xprt %p: connection refused for %s\n",
1929 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1932 printk(KERN_ERR
"%s: unhandled error (%d) connecting to %s\n",
1934 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1938 xprt_clear_connecting(xprt
);
1939 xprt_wake_pending_tasks(xprt
, status
);
1940 current
->flags
&= ~PF_FSTRANS
;
1944 static void xs_local_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1946 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1949 if (RPC_IS_ASYNC(task
)) {
1951 * We want the AF_LOCAL connect to be resolved in the
1952 * filesystem namespace of the process making the rpc
1953 * call. Thus we connect synchronously.
1955 * If we want to support asynchronous AF_LOCAL calls,
1956 * we'll need to figure out how to pass a namespace to
1959 rpc_exit(task
, -ENOTCONN
);
1962 ret
= xs_local_setup_socket(transport
);
1963 if (ret
&& !RPC_IS_SOFTCONN(task
))
1964 msleep_interruptible(15000);
1967 #ifdef CONFIG_SUNRPC_SWAP
1968 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
1970 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1974 sk_set_memalloc(transport
->inet
);
1978 * xs_swapper - Tag this transport as being used for swap.
1979 * @xprt: transport to tag
1980 * @enable: enable/disable
1983 int xs_swapper(struct rpc_xprt
*xprt
, int enable
)
1985 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1991 xs_set_memalloc(xprt
);
1992 } else if (xprt
->swapper
) {
1994 sk_clear_memalloc(transport
->inet
);
1999 EXPORT_SYMBOL_GPL(xs_swapper
);
2001 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2006 static void xs_udp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2008 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2010 if (!transport
->inet
) {
2011 struct sock
*sk
= sock
->sk
;
2013 write_lock_bh(&sk
->sk_callback_lock
);
2015 xs_save_old_callbacks(transport
, sk
);
2017 sk
->sk_user_data
= xprt
;
2018 sk
->sk_data_ready
= xs_udp_data_ready
;
2019 sk
->sk_write_space
= xs_udp_write_space
;
2020 sk
->sk_no_check
= UDP_CSUM_NORCV
;
2021 sk
->sk_allocation
= GFP_ATOMIC
;
2023 xprt_set_connected(xprt
);
2025 /* Reset to new socket */
2026 transport
->sock
= sock
;
2027 transport
->inet
= sk
;
2029 xs_set_memalloc(xprt
);
2031 write_unlock_bh(&sk
->sk_callback_lock
);
2033 xs_udp_do_set_buffer_size(xprt
);
2036 static void xs_udp_setup_socket(struct work_struct
*work
)
2038 struct sock_xprt
*transport
=
2039 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2040 struct rpc_xprt
*xprt
= &transport
->xprt
;
2041 struct socket
*sock
= transport
->sock
;
2044 current
->flags
|= PF_FSTRANS
;
2046 /* Start by resetting any existing state */
2047 xs_reset_transport(transport
);
2048 sock
= xs_create_sock(xprt
, transport
,
2049 xs_addr(xprt
)->sa_family
, SOCK_DGRAM
, IPPROTO_UDP
);
2053 dprintk("RPC: worker connecting xprt %p via %s to "
2054 "%s (port %s)\n", xprt
,
2055 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2056 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2057 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2059 xs_udp_finish_connecting(xprt
, sock
);
2062 xprt_clear_connecting(xprt
);
2063 xprt_wake_pending_tasks(xprt
, status
);
2064 current
->flags
&= ~PF_FSTRANS
;
2068 * We need to preserve the port number so the reply cache on the server can
2069 * find our cached RPC replies when we get around to reconnecting.
2071 static void xs_abort_connection(struct sock_xprt
*transport
)
2074 struct sockaddr any
;
2076 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport
);
2079 * Disconnect the transport socket by doing a connect operation
2080 * with AF_UNSPEC. This should return immediately...
2082 memset(&any
, 0, sizeof(any
));
2083 any
.sa_family
= AF_UNSPEC
;
2084 result
= kernel_connect(transport
->sock
, &any
, sizeof(any
), 0);
2086 xs_sock_reset_connection_flags(&transport
->xprt
);
2087 dprintk("RPC: AF_UNSPEC connect return code %d\n", result
);
2090 static void xs_tcp_reuse_connection(struct sock_xprt
*transport
)
2092 unsigned int state
= transport
->inet
->sk_state
;
2094 if (state
== TCP_CLOSE
&& transport
->sock
->state
== SS_UNCONNECTED
) {
2095 /* we don't need to abort the connection if the socket
2096 * hasn't undergone a shutdown
2098 if (transport
->inet
->sk_shutdown
== 0)
2100 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2101 __func__
, transport
->inet
->sk_shutdown
);
2103 if ((1 << state
) & (TCPF_ESTABLISHED
|TCPF_SYN_SENT
)) {
2104 /* we don't need to abort the connection if the socket
2105 * hasn't undergone a shutdown
2107 if (transport
->inet
->sk_shutdown
== 0)
2109 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2110 "sk_shutdown set to %d\n",
2111 __func__
, transport
->inet
->sk_shutdown
);
2113 xs_abort_connection(transport
);
2116 static int xs_tcp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2118 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2119 int ret
= -ENOTCONN
;
2121 if (!transport
->inet
) {
2122 struct sock
*sk
= sock
->sk
;
2124 write_lock_bh(&sk
->sk_callback_lock
);
2126 xs_save_old_callbacks(transport
, sk
);
2128 sk
->sk_user_data
= xprt
;
2129 sk
->sk_data_ready
= xs_tcp_data_ready
;
2130 sk
->sk_state_change
= xs_tcp_state_change
;
2131 sk
->sk_write_space
= xs_tcp_write_space
;
2132 sk
->sk_allocation
= GFP_ATOMIC
;
2134 /* socket options */
2135 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
2136 sock_reset_flag(sk
, SOCK_LINGER
);
2137 tcp_sk(sk
)->linger2
= 0;
2138 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
2140 xprt_clear_connected(xprt
);
2142 /* Reset to new socket */
2143 transport
->sock
= sock
;
2144 transport
->inet
= sk
;
2146 write_unlock_bh(&sk
->sk_callback_lock
);
2149 if (!xprt_bound(xprt
))
2152 xs_set_memalloc(xprt
);
2154 /* Tell the socket layer to start connecting... */
2155 xprt
->stat
.connect_count
++;
2156 xprt
->stat
.connect_start
= jiffies
;
2157 ret
= kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, O_NONBLOCK
);
2162 xprt
->connect_cookie
++;
2163 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2164 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2171 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2172 * @xprt: RPC transport to connect
2173 * @transport: socket transport to connect
2174 * @create_sock: function to create a socket of the correct type
2176 * Invoked by a work queue tasklet.
2178 static void xs_tcp_setup_socket(struct work_struct
*work
)
2180 struct sock_xprt
*transport
=
2181 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2182 struct socket
*sock
= transport
->sock
;
2183 struct rpc_xprt
*xprt
= &transport
->xprt
;
2186 current
->flags
|= PF_FSTRANS
;
2189 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
2190 sock
= xs_create_sock(xprt
, transport
,
2191 xs_addr(xprt
)->sa_family
, SOCK_STREAM
, IPPROTO_TCP
);
2193 status
= PTR_ERR(sock
);
2199 abort_and_exit
= test_and_clear_bit(XPRT_CONNECTION_ABORT
,
2201 /* "close" the socket, preserving the local port */
2202 xs_tcp_reuse_connection(transport
);
2208 dprintk("RPC: worker connecting xprt %p via %s to "
2209 "%s (port %s)\n", xprt
,
2210 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2211 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2212 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2214 status
= xs_tcp_finish_connecting(xprt
, sock
);
2215 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2216 xprt
, -status
, xprt_connected(xprt
),
2217 sock
->sk
->sk_state
);
2220 printk("%s: connect returned unhandled error %d\n",
2222 case -EADDRNOTAVAIL
:
2223 /* We're probably in TIME_WAIT. Get rid of existing socket,
2226 xs_tcp_force_close(xprt
);
2231 xprt_clear_connecting(xprt
);
2232 current
->flags
&= ~PF_FSTRANS
;
2235 /* Happens, for instance, if the user specified a link
2236 * local IPv6 address without a scope-id.
2241 /* retry with existing socket, after a delay */
2247 xprt_clear_connecting(xprt
);
2248 xprt_wake_pending_tasks(xprt
, status
);
2249 current
->flags
&= ~PF_FSTRANS
;
2253 * xs_connect - connect a socket to a remote endpoint
2254 * @xprt: pointer to transport structure
2255 * @task: address of RPC task that manages state of connect request
2257 * TCP: If the remote end dropped the connection, delay reconnecting.
2259 * UDP socket connects are synchronous, but we use a work queue anyway
2260 * to guarantee that even unprivileged user processes can set up a
2261 * socket on a privileged port.
2263 * If a UDP socket connect fails, the delay behavior here prevents
2264 * retry floods (hard mounts).
2266 static void xs_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
2268 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2270 if (transport
->sock
!= NULL
&& !RPC_IS_SOFTCONN(task
)) {
2271 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2273 xprt
, xprt
->reestablish_timeout
/ HZ
);
2274 queue_delayed_work(rpciod_workqueue
,
2275 &transport
->connect_worker
,
2276 xprt
->reestablish_timeout
);
2277 xprt
->reestablish_timeout
<<= 1;
2278 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2279 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2280 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
2281 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
2283 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
2284 queue_delayed_work(rpciod_workqueue
,
2285 &transport
->connect_worker
, 0);
2290 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2291 * @xprt: rpc_xprt struct containing statistics
2295 static void xs_local_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2299 if (xprt_connected(xprt
))
2300 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2302 seq_printf(seq
, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2303 "%llu %llu %lu %llu %llu\n",
2304 xprt
->stat
.bind_count
,
2305 xprt
->stat
.connect_count
,
2306 xprt
->stat
.connect_time
,
2310 xprt
->stat
.bad_xids
,
2313 xprt
->stat
.max_slots
,
2314 xprt
->stat
.sending_u
,
2315 xprt
->stat
.pending_u
);
2319 * xs_udp_print_stats - display UDP socket-specifc stats
2320 * @xprt: rpc_xprt struct containing statistics
2324 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2326 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2328 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2331 xprt
->stat
.bind_count
,
2334 xprt
->stat
.bad_xids
,
2337 xprt
->stat
.max_slots
,
2338 xprt
->stat
.sending_u
,
2339 xprt
->stat
.pending_u
);
2343 * xs_tcp_print_stats - display TCP socket-specifc stats
2344 * @xprt: rpc_xprt struct containing statistics
2348 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2350 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2353 if (xprt_connected(xprt
))
2354 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2356 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2357 "%llu %llu %lu %llu %llu\n",
2359 xprt
->stat
.bind_count
,
2360 xprt
->stat
.connect_count
,
2361 xprt
->stat
.connect_time
,
2365 xprt
->stat
.bad_xids
,
2368 xprt
->stat
.max_slots
,
2369 xprt
->stat
.sending_u
,
2370 xprt
->stat
.pending_u
);
2374 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2375 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2376 * to use the server side send routines.
2378 static void *bc_malloc(struct rpc_task
*task
, size_t size
)
2381 struct rpc_buffer
*buf
;
2383 WARN_ON_ONCE(size
> PAGE_SIZE
- sizeof(struct rpc_buffer
));
2384 if (size
> PAGE_SIZE
- sizeof(struct rpc_buffer
))
2387 page
= alloc_page(GFP_KERNEL
);
2391 buf
= page_address(page
);
2392 buf
->len
= PAGE_SIZE
;
2398 * Free the space allocated in the bc_alloc routine
2400 static void bc_free(void *buffer
)
2402 struct rpc_buffer
*buf
;
2407 buf
= container_of(buffer
, struct rpc_buffer
, data
);
2408 free_page((unsigned long)buf
);
2412 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2413 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2415 static int bc_sendto(struct rpc_rqst
*req
)
2418 struct xdr_buf
*xbufp
= &req
->rq_snd_buf
;
2419 struct rpc_xprt
*xprt
= req
->rq_xprt
;
2420 struct sock_xprt
*transport
=
2421 container_of(xprt
, struct sock_xprt
, xprt
);
2422 struct socket
*sock
= transport
->sock
;
2423 unsigned long headoff
;
2424 unsigned long tailoff
;
2426 xs_encode_stream_record_marker(xbufp
);
2428 tailoff
= (unsigned long)xbufp
->tail
[0].iov_base
& ~PAGE_MASK
;
2429 headoff
= (unsigned long)xbufp
->head
[0].iov_base
& ~PAGE_MASK
;
2430 len
= svc_send_common(sock
, xbufp
,
2431 virt_to_page(xbufp
->head
[0].iov_base
), headoff
,
2432 xbufp
->tail
[0].iov_base
, tailoff
);
2434 if (len
!= xbufp
->len
) {
2435 printk(KERN_NOTICE
"Error sending entire callback!\n");
2443 * The send routine. Borrows from svc_send
2445 static int bc_send_request(struct rpc_task
*task
)
2447 struct rpc_rqst
*req
= task
->tk_rqstp
;
2448 struct svc_xprt
*xprt
;
2451 dprintk("sending request with xid: %08x\n", ntohl(req
->rq_xid
));
2453 * Get the server socket associated with this callback xprt
2455 xprt
= req
->rq_xprt
->bc_xprt
;
2458 * Grab the mutex to serialize data as the connection is shared
2459 * with the fore channel
2461 if (!mutex_trylock(&xprt
->xpt_mutex
)) {
2462 rpc_sleep_on(&xprt
->xpt_bc_pending
, task
, NULL
);
2463 if (!mutex_trylock(&xprt
->xpt_mutex
))
2465 rpc_wake_up_queued_task(&xprt
->xpt_bc_pending
, task
);
2467 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
))
2470 len
= bc_sendto(req
);
2471 mutex_unlock(&xprt
->xpt_mutex
);
2480 * The close routine. Since this is client initiated, we do nothing
2483 static void bc_close(struct rpc_xprt
*xprt
)
2488 * The xprt destroy routine. Again, because this connection is client
2489 * initiated, we do nothing
2492 static void bc_destroy(struct rpc_xprt
*xprt
)
2496 static struct rpc_xprt_ops xs_local_ops
= {
2497 .reserve_xprt
= xprt_reserve_xprt
,
2498 .release_xprt
= xs_tcp_release_xprt
,
2499 .alloc_slot
= xprt_alloc_slot
,
2500 .rpcbind
= xs_local_rpcbind
,
2501 .set_port
= xs_local_set_port
,
2502 .connect
= xs_local_connect
,
2503 .buf_alloc
= rpc_malloc
,
2504 .buf_free
= rpc_free
,
2505 .send_request
= xs_local_send_request
,
2506 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2508 .destroy
= xs_local_destroy
,
2509 .print_stats
= xs_local_print_stats
,
2512 static struct rpc_xprt_ops xs_udp_ops
= {
2513 .set_buffer_size
= xs_udp_set_buffer_size
,
2514 .reserve_xprt
= xprt_reserve_xprt_cong
,
2515 .release_xprt
= xprt_release_xprt_cong
,
2516 .alloc_slot
= xprt_alloc_slot
,
2517 .rpcbind
= rpcb_getport_async
,
2518 .set_port
= xs_set_port
,
2519 .connect
= xs_connect
,
2520 .buf_alloc
= rpc_malloc
,
2521 .buf_free
= rpc_free
,
2522 .send_request
= xs_udp_send_request
,
2523 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
2524 .timer
= xs_udp_timer
,
2525 .release_request
= xprt_release_rqst_cong
,
2527 .destroy
= xs_destroy
,
2528 .print_stats
= xs_udp_print_stats
,
2531 static struct rpc_xprt_ops xs_tcp_ops
= {
2532 .reserve_xprt
= xprt_reserve_xprt
,
2533 .release_xprt
= xs_tcp_release_xprt
,
2534 .alloc_slot
= xprt_lock_and_alloc_slot
,
2535 .rpcbind
= rpcb_getport_async
,
2536 .set_port
= xs_set_port
,
2537 .connect
= xs_connect
,
2538 .buf_alloc
= rpc_malloc
,
2539 .buf_free
= rpc_free
,
2540 .send_request
= xs_tcp_send_request
,
2541 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2542 .close
= xs_tcp_close
,
2543 .destroy
= xs_destroy
,
2544 .print_stats
= xs_tcp_print_stats
,
2548 * The rpc_xprt_ops for the server backchannel
2551 static struct rpc_xprt_ops bc_tcp_ops
= {
2552 .reserve_xprt
= xprt_reserve_xprt
,
2553 .release_xprt
= xprt_release_xprt
,
2554 .alloc_slot
= xprt_alloc_slot
,
2555 .rpcbind
= xs_local_rpcbind
,
2556 .buf_alloc
= bc_malloc
,
2557 .buf_free
= bc_free
,
2558 .send_request
= bc_send_request
,
2559 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2561 .destroy
= bc_destroy
,
2562 .print_stats
= xs_tcp_print_stats
,
2565 static int xs_init_anyaddr(const int family
, struct sockaddr
*sap
)
2567 static const struct sockaddr_in sin
= {
2568 .sin_family
= AF_INET
,
2569 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
2571 static const struct sockaddr_in6 sin6
= {
2572 .sin6_family
= AF_INET6
,
2573 .sin6_addr
= IN6ADDR_ANY_INIT
,
2580 memcpy(sap
, &sin
, sizeof(sin
));
2583 memcpy(sap
, &sin6
, sizeof(sin6
));
2586 dprintk("RPC: %s: Bad address family\n", __func__
);
2587 return -EAFNOSUPPORT
;
2592 static struct rpc_xprt
*xs_setup_xprt(struct xprt_create
*args
,
2593 unsigned int slot_table_size
,
2594 unsigned int max_slot_table_size
)
2596 struct rpc_xprt
*xprt
;
2597 struct sock_xprt
*new;
2599 if (args
->addrlen
> sizeof(xprt
->addr
)) {
2600 dprintk("RPC: xs_setup_xprt: address too large\n");
2601 return ERR_PTR(-EBADF
);
2604 xprt
= xprt_alloc(args
->net
, sizeof(*new), slot_table_size
,
2605 max_slot_table_size
);
2607 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2609 return ERR_PTR(-ENOMEM
);
2612 new = container_of(xprt
, struct sock_xprt
, xprt
);
2613 memcpy(&xprt
->addr
, args
->dstaddr
, args
->addrlen
);
2614 xprt
->addrlen
= args
->addrlen
;
2616 memcpy(&new->srcaddr
, args
->srcaddr
, args
->addrlen
);
2619 err
= xs_init_anyaddr(args
->dstaddr
->sa_family
,
2620 (struct sockaddr
*)&new->srcaddr
);
2623 return ERR_PTR(err
);
2630 static const struct rpc_timeout xs_local_default_timeout
= {
2631 .to_initval
= 10 * HZ
,
2632 .to_maxval
= 10 * HZ
,
2637 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2638 * @args: rpc transport creation arguments
2640 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2642 static struct rpc_xprt
*xs_setup_local(struct xprt_create
*args
)
2644 struct sockaddr_un
*sun
= (struct sockaddr_un
*)args
->dstaddr
;
2645 struct sock_xprt
*transport
;
2646 struct rpc_xprt
*xprt
;
2647 struct rpc_xprt
*ret
;
2649 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2650 xprt_max_tcp_slot_table_entries
);
2653 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2656 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2657 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2659 xprt
->bind_timeout
= XS_BIND_TO
;
2660 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2661 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2663 xprt
->ops
= &xs_local_ops
;
2664 xprt
->timeout
= &xs_local_default_timeout
;
2666 switch (sun
->sun_family
) {
2668 if (sun
->sun_path
[0] != '/') {
2669 dprintk("RPC: bad AF_LOCAL address: %s\n",
2671 ret
= ERR_PTR(-EINVAL
);
2674 xprt_set_bound(xprt
);
2675 xs_format_peer_addresses(xprt
, "local", RPCBIND_NETID_LOCAL
);
2676 ret
= ERR_PTR(xs_local_setup_socket(transport
));
2681 ret
= ERR_PTR(-EAFNOSUPPORT
);
2685 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2686 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2688 if (try_module_get(THIS_MODULE
))
2690 ret
= ERR_PTR(-EINVAL
);
2696 static const struct rpc_timeout xs_udp_default_timeout
= {
2697 .to_initval
= 5 * HZ
,
2698 .to_maxval
= 30 * HZ
,
2699 .to_increment
= 5 * HZ
,
2704 * xs_setup_udp - Set up transport to use a UDP socket
2705 * @args: rpc transport creation arguments
2708 static struct rpc_xprt
*xs_setup_udp(struct xprt_create
*args
)
2710 struct sockaddr
*addr
= args
->dstaddr
;
2711 struct rpc_xprt
*xprt
;
2712 struct sock_xprt
*transport
;
2713 struct rpc_xprt
*ret
;
2715 xprt
= xs_setup_xprt(args
, xprt_udp_slot_table_entries
,
2716 xprt_udp_slot_table_entries
);
2719 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2721 xprt
->prot
= IPPROTO_UDP
;
2723 /* XXX: header size can vary due to auth type, IPv6, etc. */
2724 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
2726 xprt
->bind_timeout
= XS_BIND_TO
;
2727 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
2728 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2730 xprt
->ops
= &xs_udp_ops
;
2732 xprt
->timeout
= &xs_udp_default_timeout
;
2734 switch (addr
->sa_family
) {
2736 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2737 xprt_set_bound(xprt
);
2739 INIT_DELAYED_WORK(&transport
->connect_worker
,
2740 xs_udp_setup_socket
);
2741 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP
);
2744 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2745 xprt_set_bound(xprt
);
2747 INIT_DELAYED_WORK(&transport
->connect_worker
,
2748 xs_udp_setup_socket
);
2749 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP6
);
2752 ret
= ERR_PTR(-EAFNOSUPPORT
);
2756 if (xprt_bound(xprt
))
2757 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2758 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2759 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2760 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2762 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2763 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2764 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2766 if (try_module_get(THIS_MODULE
))
2768 ret
= ERR_PTR(-EINVAL
);
2774 static const struct rpc_timeout xs_tcp_default_timeout
= {
2775 .to_initval
= 60 * HZ
,
2776 .to_maxval
= 60 * HZ
,
2781 * xs_setup_tcp - Set up transport to use a TCP socket
2782 * @args: rpc transport creation arguments
2785 static struct rpc_xprt
*xs_setup_tcp(struct xprt_create
*args
)
2787 struct sockaddr
*addr
= args
->dstaddr
;
2788 struct rpc_xprt
*xprt
;
2789 struct sock_xprt
*transport
;
2790 struct rpc_xprt
*ret
;
2791 unsigned int max_slot_table_size
= xprt_max_tcp_slot_table_entries
;
2793 if (args
->flags
& XPRT_CREATE_INFINITE_SLOTS
)
2794 max_slot_table_size
= RPC_MAX_SLOT_TABLE_LIMIT
;
2796 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2797 max_slot_table_size
);
2800 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2802 xprt
->prot
= IPPROTO_TCP
;
2803 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2804 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2806 xprt
->bind_timeout
= XS_BIND_TO
;
2807 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2808 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2810 xprt
->ops
= &xs_tcp_ops
;
2811 xprt
->timeout
= &xs_tcp_default_timeout
;
2813 switch (addr
->sa_family
) {
2815 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2816 xprt_set_bound(xprt
);
2818 INIT_DELAYED_WORK(&transport
->connect_worker
,
2819 xs_tcp_setup_socket
);
2820 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP
);
2823 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2824 xprt_set_bound(xprt
);
2826 INIT_DELAYED_WORK(&transport
->connect_worker
,
2827 xs_tcp_setup_socket
);
2828 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP6
);
2831 ret
= ERR_PTR(-EAFNOSUPPORT
);
2835 if (xprt_bound(xprt
))
2836 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2837 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2838 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2839 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2841 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2842 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2843 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2846 if (try_module_get(THIS_MODULE
))
2848 ret
= ERR_PTR(-EINVAL
);
2855 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2856 * @args: rpc transport creation arguments
2859 static struct rpc_xprt
*xs_setup_bc_tcp(struct xprt_create
*args
)
2861 struct sockaddr
*addr
= args
->dstaddr
;
2862 struct rpc_xprt
*xprt
;
2863 struct sock_xprt
*transport
;
2864 struct svc_sock
*bc_sock
;
2865 struct rpc_xprt
*ret
;
2867 if (args
->bc_xprt
->xpt_bc_xprt
) {
2869 * This server connection already has a backchannel
2870 * export; we can't create a new one, as we wouldn't be
2871 * able to match replies based on xid any more. So,
2872 * reuse the already-existing one:
2874 return args
->bc_xprt
->xpt_bc_xprt
;
2876 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2877 xprt_tcp_slot_table_entries
);
2880 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2882 xprt
->prot
= IPPROTO_TCP
;
2883 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2884 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2885 xprt
->timeout
= &xs_tcp_default_timeout
;
2888 xprt_set_bound(xprt
);
2889 xprt
->bind_timeout
= 0;
2890 xprt
->reestablish_timeout
= 0;
2891 xprt
->idle_timeout
= 0;
2893 xprt
->ops
= &bc_tcp_ops
;
2895 switch (addr
->sa_family
) {
2897 xs_format_peer_addresses(xprt
, "tcp",
2901 xs_format_peer_addresses(xprt
, "tcp",
2902 RPCBIND_NETID_TCP6
);
2905 ret
= ERR_PTR(-EAFNOSUPPORT
);
2909 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2910 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2911 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2912 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2915 * Once we've associated a backchannel xprt with a connection,
2916 * we want to keep it around as long as long as the connection
2917 * lasts, in case we need to start using it for a backchannel
2918 * again; this reference won't be dropped until bc_xprt is
2922 args
->bc_xprt
->xpt_bc_xprt
= xprt
;
2923 xprt
->bc_xprt
= args
->bc_xprt
;
2924 bc_sock
= container_of(args
->bc_xprt
, struct svc_sock
, sk_xprt
);
2925 transport
->sock
= bc_sock
->sk_sock
;
2926 transport
->inet
= bc_sock
->sk_sk
;
2929 * Since we don't want connections for the backchannel, we set
2930 * the xprt status to connected
2932 xprt_set_connected(xprt
);
2935 if (try_module_get(THIS_MODULE
))
2938 ret
= ERR_PTR(-EINVAL
);
2944 static struct xprt_class xs_local_transport
= {
2945 .list
= LIST_HEAD_INIT(xs_local_transport
.list
),
2946 .name
= "named UNIX socket",
2947 .owner
= THIS_MODULE
,
2948 .ident
= XPRT_TRANSPORT_LOCAL
,
2949 .setup
= xs_setup_local
,
2952 static struct xprt_class xs_udp_transport
= {
2953 .list
= LIST_HEAD_INIT(xs_udp_transport
.list
),
2955 .owner
= THIS_MODULE
,
2956 .ident
= XPRT_TRANSPORT_UDP
,
2957 .setup
= xs_setup_udp
,
2960 static struct xprt_class xs_tcp_transport
= {
2961 .list
= LIST_HEAD_INIT(xs_tcp_transport
.list
),
2963 .owner
= THIS_MODULE
,
2964 .ident
= XPRT_TRANSPORT_TCP
,
2965 .setup
= xs_setup_tcp
,
2968 static struct xprt_class xs_bc_tcp_transport
= {
2969 .list
= LIST_HEAD_INIT(xs_bc_tcp_transport
.list
),
2970 .name
= "tcp NFSv4.1 backchannel",
2971 .owner
= THIS_MODULE
,
2972 .ident
= XPRT_TRANSPORT_BC_TCP
,
2973 .setup
= xs_setup_bc_tcp
,
2977 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2980 int init_socket_xprt(void)
2983 if (!sunrpc_table_header
)
2984 sunrpc_table_header
= register_sysctl_table(sunrpc_table
);
2987 xprt_register_transport(&xs_local_transport
);
2988 xprt_register_transport(&xs_udp_transport
);
2989 xprt_register_transport(&xs_tcp_transport
);
2990 xprt_register_transport(&xs_bc_tcp_transport
);
2996 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2999 void cleanup_socket_xprt(void)
3002 if (sunrpc_table_header
) {
3003 unregister_sysctl_table(sunrpc_table_header
);
3004 sunrpc_table_header
= NULL
;
3008 xprt_unregister_transport(&xs_local_transport
);
3009 xprt_unregister_transport(&xs_udp_transport
);
3010 xprt_unregister_transport(&xs_tcp_transport
);
3011 xprt_unregister_transport(&xs_bc_tcp_transport
);
3014 static int param_set_uint_minmax(const char *val
,
3015 const struct kernel_param
*kp
,
3016 unsigned int min
, unsigned int max
)
3023 ret
= strict_strtoul(val
, 0, &num
);
3024 if (ret
== -EINVAL
|| num
< min
|| num
> max
)
3026 *((unsigned int *)kp
->arg
) = num
;
3030 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
3032 return param_set_uint_minmax(val
, kp
,
3037 static struct kernel_param_ops param_ops_portnr
= {
3038 .set
= param_set_portnr
,
3039 .get
= param_get_uint
,
3042 #define param_check_portnr(name, p) \
3043 __param_check(name, p, unsigned int);
3045 module_param_named(min_resvport
, xprt_min_resvport
, portnr
, 0644);
3046 module_param_named(max_resvport
, xprt_max_resvport
, portnr
, 0644);
3048 static int param_set_slot_table_size(const char *val
,
3049 const struct kernel_param
*kp
)
3051 return param_set_uint_minmax(val
, kp
,
3053 RPC_MAX_SLOT_TABLE
);
3056 static struct kernel_param_ops param_ops_slot_table_size
= {
3057 .set
= param_set_slot_table_size
,
3058 .get
= param_get_uint
,
3061 #define param_check_slot_table_size(name, p) \
3062 __param_check(name, p, unsigned int);
3064 static int param_set_max_slot_table_size(const char *val
,
3065 const struct kernel_param
*kp
)
3067 return param_set_uint_minmax(val
, kp
,
3069 RPC_MAX_SLOT_TABLE_LIMIT
);
3072 static struct kernel_param_ops param_ops_max_slot_table_size
= {
3073 .set
= param_set_max_slot_table_size
,
3074 .get
= param_get_uint
,
3077 #define param_check_max_slot_table_size(name, p) \
3078 __param_check(name, p, unsigned int);
3080 module_param_named(tcp_slot_table_entries
, xprt_tcp_slot_table_entries
,
3081 slot_table_size
, 0644);
3082 module_param_named(tcp_max_slot_table_entries
, xprt_max_tcp_slot_table_entries
,
3083 max_slot_table_size
, 0644);
3084 module_param_named(udp_slot_table_entries
, xprt_udp_slot_table_entries
,
3085 slot_table_size
, 0644);