2 * linux/net/sunrpc/xprtsock.c
4 * Client-side transport implementation for sockets.
6 * TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com>
7 * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
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/slab.h>
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/pagemap.h>
26 #include <linux/errno.h>
27 #include <linux/socket.h>
29 #include <linux/net.h>
31 #include <linux/udp.h>
32 #include <linux/tcp.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/sched.h>
35 #include <linux/sunrpc/xprtsock.h>
36 #include <linux/file.h>
39 #include <net/checksum.h>
46 unsigned int xprt_udp_slot_table_entries
= RPC_DEF_SLOT_TABLE
;
47 unsigned int xprt_tcp_slot_table_entries
= RPC_DEF_SLOT_TABLE
;
49 unsigned int xprt_min_resvport
= RPC_DEF_MIN_RESVPORT
;
50 unsigned int xprt_max_resvport
= RPC_DEF_MAX_RESVPORT
;
53 * We can register our own files under /proc/sys/sunrpc by
54 * calling register_sysctl_table() again. The files in that
55 * directory become the union of all files registered there.
57 * We simply need to make sure that we don't collide with
58 * someone else's file names!
63 static unsigned int min_slot_table_size
= RPC_MIN_SLOT_TABLE
;
64 static unsigned int max_slot_table_size
= RPC_MAX_SLOT_TABLE
;
65 static unsigned int xprt_min_resvport_limit
= RPC_MIN_RESVPORT
;
66 static unsigned int xprt_max_resvport_limit
= RPC_MAX_RESVPORT
;
68 static struct ctl_table_header
*sunrpc_table_header
;
71 * FIXME: changing the UDP slot table size should also resize the UDP
72 * socket buffers for existing UDP transports
74 static ctl_table xs_tunables_table
[] = {
76 .ctl_name
= CTL_SLOTTABLE_UDP
,
77 .procname
= "udp_slot_table_entries",
78 .data
= &xprt_udp_slot_table_entries
,
79 .maxlen
= sizeof(unsigned int),
81 .proc_handler
= &proc_dointvec_minmax
,
82 .strategy
= &sysctl_intvec
,
83 .extra1
= &min_slot_table_size
,
84 .extra2
= &max_slot_table_size
87 .ctl_name
= CTL_SLOTTABLE_TCP
,
88 .procname
= "tcp_slot_table_entries",
89 .data
= &xprt_tcp_slot_table_entries
,
90 .maxlen
= sizeof(unsigned int),
92 .proc_handler
= &proc_dointvec_minmax
,
93 .strategy
= &sysctl_intvec
,
94 .extra1
= &min_slot_table_size
,
95 .extra2
= &max_slot_table_size
98 .ctl_name
= CTL_MIN_RESVPORT
,
99 .procname
= "min_resvport",
100 .data
= &xprt_min_resvport
,
101 .maxlen
= sizeof(unsigned int),
103 .proc_handler
= &proc_dointvec_minmax
,
104 .strategy
= &sysctl_intvec
,
105 .extra1
= &xprt_min_resvport_limit
,
106 .extra2
= &xprt_max_resvport_limit
109 .ctl_name
= CTL_MAX_RESVPORT
,
110 .procname
= "max_resvport",
111 .data
= &xprt_max_resvport
,
112 .maxlen
= sizeof(unsigned int),
114 .proc_handler
= &proc_dointvec_minmax
,
115 .strategy
= &sysctl_intvec
,
116 .extra1
= &xprt_min_resvport_limit
,
117 .extra2
= &xprt_max_resvport_limit
124 static ctl_table sunrpc_table
[] = {
126 .ctl_name
= CTL_SUNRPC
,
127 .procname
= "sunrpc",
129 .child
= xs_tunables_table
139 * How many times to try sending a request on a socket before waiting
140 * for the socket buffer to clear.
142 #define XS_SENDMSG_RETRY (10U)
145 * Time out for an RPC UDP socket connect. UDP socket connects are
146 * synchronous, but we set a timeout anyway in case of resource
147 * exhaustion on the local host.
149 #define XS_UDP_CONN_TO (5U * HZ)
152 * Wait duration for an RPC TCP connection to be established. Solaris
153 * NFS over TCP uses 60 seconds, for example, which is in line with how
154 * long a server takes to reboot.
156 #define XS_TCP_CONN_TO (60U * HZ)
159 * Wait duration for a reply from the RPC portmapper.
161 #define XS_BIND_TO (60U * HZ)
164 * Delay if a UDP socket connect error occurs. This is most likely some
165 * kind of resource problem on the local host.
167 #define XS_UDP_REEST_TO (2U * HZ)
170 * The reestablish timeout allows clients to delay for a bit before attempting
171 * to reconnect to a server that just dropped our connection.
173 * We implement an exponential backoff when trying to reestablish a TCP
174 * transport connection with the server. Some servers like to drop a TCP
175 * connection when they are overworked, so we start with a short timeout and
176 * increase over time if the server is down or not responding.
178 #define XS_TCP_INIT_REEST_TO (3U * HZ)
179 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
182 * TCP idle timeout; client drops the transport socket if it is idle
183 * for this long. Note that we also timeout UDP sockets to prevent
184 * holding port numbers when there is no RPC traffic.
186 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
189 # undef RPC_DEBUG_DATA
190 # define RPCDBG_FACILITY RPCDBG_TRANS
193 #ifdef RPC_DEBUG_DATA
194 static void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
196 u8
*buf
= (u8
*) packet
;
199 dprintk("RPC: %s\n", msg
);
200 for (j
= 0; j
< count
&& j
< 128; j
+= 4) {
204 dprintk("0x%04x ", j
);
206 dprintk("%02x%02x%02x%02x ",
207 buf
[j
], buf
[j
+1], buf
[j
+2], buf
[j
+3]);
212 static inline void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
219 struct rpc_xprt xprt
;
224 struct socket
* sock
;
228 * State of TCP reply receive
236 unsigned long tcp_copied
,
240 * Connection of transports
242 struct delayed_work connect_worker
;
243 struct sockaddr_storage addr
;
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)
268 static inline struct sockaddr
*xs_addr(struct rpc_xprt
*xprt
)
270 return (struct sockaddr
*) &xprt
->addr
;
273 static inline struct sockaddr_in
*xs_addr_in(struct rpc_xprt
*xprt
)
275 return (struct sockaddr_in
*) &xprt
->addr
;
278 static inline struct sockaddr_in6
*xs_addr_in6(struct rpc_xprt
*xprt
)
280 return (struct sockaddr_in6
*) &xprt
->addr
;
283 static void xs_format_ipv4_peer_addresses(struct rpc_xprt
*xprt
,
284 const char *protocol
,
287 struct sockaddr_in
*addr
= xs_addr_in(xprt
);
290 buf
= kzalloc(20, GFP_KERNEL
);
292 snprintf(buf
, 20, NIPQUAD_FMT
,
293 NIPQUAD(addr
->sin_addr
.s_addr
));
295 xprt
->address_strings
[RPC_DISPLAY_ADDR
] = buf
;
297 buf
= kzalloc(8, GFP_KERNEL
);
299 snprintf(buf
, 8, "%u",
300 ntohs(addr
->sin_port
));
302 xprt
->address_strings
[RPC_DISPLAY_PORT
] = buf
;
304 xprt
->address_strings
[RPC_DISPLAY_PROTO
] = protocol
;
306 buf
= kzalloc(48, GFP_KERNEL
);
308 snprintf(buf
, 48, "addr="NIPQUAD_FMT
" port=%u proto=%s",
309 NIPQUAD(addr
->sin_addr
.s_addr
),
310 ntohs(addr
->sin_port
),
313 xprt
->address_strings
[RPC_DISPLAY_ALL
] = buf
;
315 buf
= kzalloc(10, GFP_KERNEL
);
317 snprintf(buf
, 10, "%02x%02x%02x%02x",
318 NIPQUAD(addr
->sin_addr
.s_addr
));
320 xprt
->address_strings
[RPC_DISPLAY_HEX_ADDR
] = buf
;
322 buf
= kzalloc(8, GFP_KERNEL
);
324 snprintf(buf
, 8, "%4hx",
325 ntohs(addr
->sin_port
));
327 xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
] = buf
;
329 buf
= kzalloc(30, GFP_KERNEL
);
331 snprintf(buf
, 30, NIPQUAD_FMT
".%u.%u",
332 NIPQUAD(addr
->sin_addr
.s_addr
),
333 ntohs(addr
->sin_port
) >> 8,
334 ntohs(addr
->sin_port
) & 0xff);
336 xprt
->address_strings
[RPC_DISPLAY_UNIVERSAL_ADDR
] = buf
;
338 xprt
->address_strings
[RPC_DISPLAY_NETID
] = netid
;
341 static void xs_format_ipv6_peer_addresses(struct rpc_xprt
*xprt
,
342 const char *protocol
,
345 struct sockaddr_in6
*addr
= xs_addr_in6(xprt
);
348 buf
= kzalloc(40, GFP_KERNEL
);
350 snprintf(buf
, 40, NIP6_FMT
,
351 NIP6(addr
->sin6_addr
));
353 xprt
->address_strings
[RPC_DISPLAY_ADDR
] = buf
;
355 buf
= kzalloc(8, GFP_KERNEL
);
357 snprintf(buf
, 8, "%u",
358 ntohs(addr
->sin6_port
));
360 xprt
->address_strings
[RPC_DISPLAY_PORT
] = buf
;
362 xprt
->address_strings
[RPC_DISPLAY_PROTO
] = protocol
;
364 buf
= kzalloc(64, GFP_KERNEL
);
366 snprintf(buf
, 64, "addr="NIP6_FMT
" port=%u proto=%s",
367 NIP6(addr
->sin6_addr
),
368 ntohs(addr
->sin6_port
),
371 xprt
->address_strings
[RPC_DISPLAY_ALL
] = buf
;
373 buf
= kzalloc(36, GFP_KERNEL
);
375 snprintf(buf
, 36, NIP6_SEQFMT
,
376 NIP6(addr
->sin6_addr
));
378 xprt
->address_strings
[RPC_DISPLAY_HEX_ADDR
] = buf
;
380 buf
= kzalloc(8, GFP_KERNEL
);
382 snprintf(buf
, 8, "%4hx",
383 ntohs(addr
->sin6_port
));
385 xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
] = buf
;
387 buf
= kzalloc(50, GFP_KERNEL
);
389 snprintf(buf
, 50, NIP6_FMT
".%u.%u",
390 NIP6(addr
->sin6_addr
),
391 ntohs(addr
->sin6_port
) >> 8,
392 ntohs(addr
->sin6_port
) & 0xff);
394 xprt
->address_strings
[RPC_DISPLAY_UNIVERSAL_ADDR
] = buf
;
396 xprt
->address_strings
[RPC_DISPLAY_NETID
] = netid
;
399 static void xs_free_peer_addresses(struct rpc_xprt
*xprt
)
401 kfree(xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
402 kfree(xprt
->address_strings
[RPC_DISPLAY_PORT
]);
403 kfree(xprt
->address_strings
[RPC_DISPLAY_ALL
]);
404 kfree(xprt
->address_strings
[RPC_DISPLAY_HEX_ADDR
]);
405 kfree(xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
]);
406 kfree(xprt
->address_strings
[RPC_DISPLAY_UNIVERSAL_ADDR
]);
409 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
411 static int xs_send_kvec(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct kvec
*vec
, unsigned int base
, int more
)
413 struct msghdr msg
= {
415 .msg_namelen
= addrlen
,
416 .msg_flags
= XS_SENDMSG_FLAGS
| (more
? MSG_MORE
: 0),
419 .iov_base
= vec
->iov_base
+ base
,
420 .iov_len
= vec
->iov_len
- base
,
423 if (iov
.iov_len
!= 0)
424 return kernel_sendmsg(sock
, &msg
, &iov
, 1, iov
.iov_len
);
425 return kernel_sendmsg(sock
, &msg
, NULL
, 0, 0);
428 static int xs_send_pagedata(struct socket
*sock
, struct xdr_buf
*xdr
, unsigned int base
, int more
)
431 unsigned int remainder
;
434 remainder
= xdr
->page_len
- base
;
435 base
+= xdr
->page_base
;
436 ppage
= xdr
->pages
+ (base
>> PAGE_SHIFT
);
439 unsigned int len
= min_t(unsigned int, PAGE_SIZE
- base
, remainder
);
440 int flags
= XS_SENDMSG_FLAGS
;
443 if (remainder
!= 0 || more
)
445 err
= sock
->ops
->sendpage(sock
, *ppage
, base
, len
, flags
);
446 if (remainder
== 0 || err
!= len
)
460 * xs_sendpages - write pages directly to a socket
461 * @sock: socket to send on
462 * @addr: UDP only -- address of destination
463 * @addrlen: UDP only -- length of destination address
464 * @xdr: buffer containing this request
465 * @base: starting position in the buffer
468 static int xs_sendpages(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct xdr_buf
*xdr
, unsigned int base
)
470 unsigned int remainder
= xdr
->len
- base
;
476 clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
);
482 if (base
< xdr
->head
[0].iov_len
|| addr
!= NULL
) {
483 unsigned int len
= xdr
->head
[0].iov_len
- base
;
485 err
= xs_send_kvec(sock
, addr
, addrlen
, &xdr
->head
[0], base
, remainder
!= 0);
486 if (remainder
== 0 || err
!= len
)
491 base
-= xdr
->head
[0].iov_len
;
493 if (base
< xdr
->page_len
) {
494 unsigned int len
= xdr
->page_len
- base
;
496 err
= xs_send_pagedata(sock
, xdr
, base
, remainder
!= 0);
497 if (remainder
== 0 || err
!= len
)
502 base
-= xdr
->page_len
;
504 if (base
>= xdr
->tail
[0].iov_len
)
506 err
= xs_send_kvec(sock
, NULL
, 0, &xdr
->tail
[0], base
, 0);
516 * xs_nospace - place task on wait queue if transmit was incomplete
517 * @task: task to put to sleep
520 static void xs_nospace(struct rpc_task
*task
)
522 struct rpc_rqst
*req
= task
->tk_rqstp
;
523 struct rpc_xprt
*xprt
= req
->rq_xprt
;
524 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
526 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
527 task
->tk_pid
, req
->rq_slen
- req
->rq_bytes_sent
,
530 if (test_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
)) {
531 /* Protect against races with write_space */
532 spin_lock_bh(&xprt
->transport_lock
);
534 /* Don't race with disconnect */
535 if (!xprt_connected(xprt
))
536 task
->tk_status
= -ENOTCONN
;
537 else if (test_bit(SOCK_NOSPACE
, &transport
->sock
->flags
))
538 xprt_wait_for_buffer_space(task
);
540 spin_unlock_bh(&xprt
->transport_lock
);
542 /* Keep holding the socket if it is blocked */
543 rpc_delay(task
, HZ
>>4);
547 * xs_udp_send_request - write an RPC request to a UDP socket
548 * @task: address of RPC task that manages the state of an RPC request
551 * 0: The request has been sent
552 * EAGAIN: The socket was blocked, please call again later to
553 * complete the request
554 * ENOTCONN: Caller needs to invoke connect logic then call again
555 * other: Some other error occured, the request was not sent
557 static int xs_udp_send_request(struct rpc_task
*task
)
559 struct rpc_rqst
*req
= task
->tk_rqstp
;
560 struct rpc_xprt
*xprt
= req
->rq_xprt
;
561 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
562 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
565 xs_pktdump("packet data:",
566 req
->rq_svec
->iov_base
,
567 req
->rq_svec
->iov_len
);
569 req
->rq_xtime
= jiffies
;
570 status
= xs_sendpages(transport
->sock
,
575 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
576 xdr
->len
- req
->rq_bytes_sent
, status
);
579 task
->tk_bytes_sent
+= status
;
580 if (status
>= req
->rq_slen
)
582 /* Still some bytes left; set up for a retry later. */
590 /* When the server has died, an ICMP port unreachable message
591 * prompts ECONNREFUSED. */
597 dprintk("RPC: sendmsg returned unrecognized error %d\n",
606 * xs_tcp_shutdown - gracefully shut down a TCP socket
609 * Initiates a graceful shutdown of the TCP socket by calling the
610 * equivalent of shutdown(SHUT_WR);
612 static void xs_tcp_shutdown(struct rpc_xprt
*xprt
)
614 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
615 struct socket
*sock
= transport
->sock
;
618 kernel_sock_shutdown(sock
, SHUT_WR
);
621 static inline void xs_encode_tcp_record_marker(struct xdr_buf
*buf
)
623 u32 reclen
= buf
->len
- sizeof(rpc_fraghdr
);
624 rpc_fraghdr
*base
= buf
->head
[0].iov_base
;
625 *base
= htonl(RPC_LAST_STREAM_FRAGMENT
| reclen
);
629 * xs_tcp_send_request - write an RPC request to a TCP socket
630 * @task: address of RPC task that manages the state of an RPC request
633 * 0: The request has been sent
634 * EAGAIN: The socket was blocked, please call again later to
635 * complete the request
636 * ENOTCONN: Caller needs to invoke connect logic then call again
637 * other: Some other error occured, the request was not sent
639 * XXX: In the case of soft timeouts, should we eventually give up
640 * if sendmsg is not able to make progress?
642 static int xs_tcp_send_request(struct rpc_task
*task
)
644 struct rpc_rqst
*req
= task
->tk_rqstp
;
645 struct rpc_xprt
*xprt
= req
->rq_xprt
;
646 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
647 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
649 unsigned int retry
= 0;
651 xs_encode_tcp_record_marker(&req
->rq_snd_buf
);
653 xs_pktdump("packet data:",
654 req
->rq_svec
->iov_base
,
655 req
->rq_svec
->iov_len
);
657 /* Continue transmitting the packet/record. We must be careful
658 * to cope with writespace callbacks arriving _after_ we have
659 * called sendmsg(). */
661 req
->rq_xtime
= jiffies
;
662 status
= xs_sendpages(transport
->sock
,
663 NULL
, 0, xdr
, req
->rq_bytes_sent
);
665 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
666 xdr
->len
- req
->rq_bytes_sent
, status
);
668 if (unlikely(status
< 0))
671 /* If we've sent the entire packet, immediately
672 * reset the count of bytes sent. */
673 req
->rq_bytes_sent
+= status
;
674 task
->tk_bytes_sent
+= status
;
675 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
676 req
->rq_bytes_sent
= 0;
681 if (retry
++ > XS_SENDMSG_RETRY
)
696 dprintk("RPC: sendmsg returned unrecognized error %d\n",
698 xs_tcp_shutdown(xprt
);
706 * xs_tcp_release_xprt - clean up after a tcp transmission
710 * This cleans up if an error causes us to abort the transmission of a request.
711 * In this case, the socket may need to be reset in order to avoid confusing
714 static void xs_tcp_release_xprt(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
716 struct rpc_rqst
*req
;
718 if (task
!= xprt
->snd_task
)
722 req
= task
->tk_rqstp
;
723 if (req
->rq_bytes_sent
== 0)
725 if (req
->rq_bytes_sent
== req
->rq_snd_buf
.len
)
727 set_bit(XPRT_CLOSE_WAIT
, &task
->tk_xprt
->state
);
729 xprt_release_xprt(xprt
, task
);
733 * xs_close - close a socket
736 * This is used when all requests are complete; ie, no DRC state remains
737 * on the server we want to save.
739 static void xs_close(struct rpc_xprt
*xprt
)
741 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
742 struct socket
*sock
= transport
->sock
;
743 struct sock
*sk
= transport
->inet
;
746 goto clear_close_wait
;
748 dprintk("RPC: xs_close xprt %p\n", xprt
);
750 write_lock_bh(&sk
->sk_callback_lock
);
751 transport
->inet
= NULL
;
752 transport
->sock
= NULL
;
754 sk
->sk_user_data
= NULL
;
755 sk
->sk_data_ready
= transport
->old_data_ready
;
756 sk
->sk_state_change
= transport
->old_state_change
;
757 sk
->sk_write_space
= transport
->old_write_space
;
758 write_unlock_bh(&sk
->sk_callback_lock
);
764 smp_mb__before_clear_bit();
765 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
766 clear_bit(XPRT_CLOSING
, &xprt
->state
);
767 smp_mb__after_clear_bit();
768 xprt_disconnect_done(xprt
);
772 * xs_destroy - prepare to shutdown a transport
773 * @xprt: doomed transport
776 static void xs_destroy(struct rpc_xprt
*xprt
)
778 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
780 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
782 cancel_rearming_delayed_work(&transport
->connect_worker
);
785 xs_free_peer_addresses(xprt
);
788 module_put(THIS_MODULE
);
791 static inline struct rpc_xprt
*xprt_from_sock(struct sock
*sk
)
793 return (struct rpc_xprt
*) sk
->sk_user_data
;
797 * xs_udp_data_ready - "data ready" callback for UDP sockets
798 * @sk: socket with data to read
799 * @len: how much data to read
802 static void xs_udp_data_ready(struct sock
*sk
, int len
)
804 struct rpc_task
*task
;
805 struct rpc_xprt
*xprt
;
806 struct rpc_rqst
*rovr
;
808 int err
, repsize
, copied
;
812 read_lock(&sk
->sk_callback_lock
);
813 dprintk("RPC: xs_udp_data_ready...\n");
814 if (!(xprt
= xprt_from_sock(sk
)))
817 if ((skb
= skb_recv_datagram(sk
, 0, 1, &err
)) == NULL
)
823 repsize
= skb
->len
- sizeof(struct udphdr
);
825 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
829 /* Copy the XID from the skb... */
830 xp
= skb_header_pointer(skb
, sizeof(struct udphdr
),
831 sizeof(_xid
), &_xid
);
835 /* Look up and lock the request corresponding to the given XID */
836 spin_lock(&xprt
->transport_lock
);
837 rovr
= xprt_lookup_rqst(xprt
, *xp
);
840 task
= rovr
->rq_task
;
842 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
845 /* Suck it into the iovec, verify checksum if not done by hw. */
846 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
847 UDPX_INC_STATS_BH(sk
, UDP_MIB_INERRORS
);
851 UDPX_INC_STATS_BH(sk
, UDP_MIB_INDATAGRAMS
);
853 /* Something worked... */
854 dst_confirm(skb
->dst
);
856 xprt_adjust_cwnd(task
, copied
);
857 xprt_update_rtt(task
);
858 xprt_complete_rqst(task
, copied
);
861 spin_unlock(&xprt
->transport_lock
);
863 skb_free_datagram(sk
, skb
);
865 read_unlock(&sk
->sk_callback_lock
);
868 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
870 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
874 p
= ((char *) &transport
->tcp_fraghdr
) + transport
->tcp_offset
;
875 len
= sizeof(transport
->tcp_fraghdr
) - transport
->tcp_offset
;
876 used
= xdr_skb_read_bits(desc
, p
, len
);
877 transport
->tcp_offset
+= used
;
881 transport
->tcp_reclen
= ntohl(transport
->tcp_fraghdr
);
882 if (transport
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
883 transport
->tcp_flags
|= TCP_RCV_LAST_FRAG
;
885 transport
->tcp_flags
&= ~TCP_RCV_LAST_FRAG
;
886 transport
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
888 transport
->tcp_flags
&= ~TCP_RCV_COPY_FRAGHDR
;
889 transport
->tcp_offset
= 0;
891 /* Sanity check of the record length */
892 if (unlikely(transport
->tcp_reclen
< 4)) {
893 dprintk("RPC: invalid TCP record fragment length\n");
894 xprt_force_disconnect(xprt
);
897 dprintk("RPC: reading TCP record fragment of length %d\n",
898 transport
->tcp_reclen
);
901 static void xs_tcp_check_fraghdr(struct sock_xprt
*transport
)
903 if (transport
->tcp_offset
== transport
->tcp_reclen
) {
904 transport
->tcp_flags
|= TCP_RCV_COPY_FRAGHDR
;
905 transport
->tcp_offset
= 0;
906 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
) {
907 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
908 transport
->tcp_flags
|= TCP_RCV_COPY_XID
;
909 transport
->tcp_copied
= 0;
914 static inline void xs_tcp_read_xid(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
919 len
= sizeof(transport
->tcp_xid
) - transport
->tcp_offset
;
920 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
921 p
= ((char *) &transport
->tcp_xid
) + transport
->tcp_offset
;
922 used
= xdr_skb_read_bits(desc
, p
, len
);
923 transport
->tcp_offset
+= used
;
926 transport
->tcp_flags
&= ~TCP_RCV_COPY_XID
;
927 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
928 transport
->tcp_copied
= 4;
929 dprintk("RPC: reading reply for XID %08x\n",
930 ntohl(transport
->tcp_xid
));
931 xs_tcp_check_fraghdr(transport
);
934 static inline void xs_tcp_read_request(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
936 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
937 struct rpc_rqst
*req
;
938 struct xdr_buf
*rcvbuf
;
942 /* Find and lock the request corresponding to this xid */
943 spin_lock(&xprt
->transport_lock
);
944 req
= xprt_lookup_rqst(xprt
, transport
->tcp_xid
);
946 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
947 dprintk("RPC: XID %08x request not found!\n",
948 ntohl(transport
->tcp_xid
));
949 spin_unlock(&xprt
->transport_lock
);
953 rcvbuf
= &req
->rq_private_buf
;
955 if (len
> transport
->tcp_reclen
- transport
->tcp_offset
) {
956 struct xdr_skb_reader my_desc
;
958 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
959 memcpy(&my_desc
, desc
, sizeof(my_desc
));
961 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
962 &my_desc
, xdr_skb_read_bits
);
966 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
967 desc
, xdr_skb_read_bits
);
970 transport
->tcp_copied
+= r
;
971 transport
->tcp_offset
+= r
;
974 /* Error when copying to the receive buffer,
975 * usually because we weren't able to allocate
976 * additional buffer pages. All we can do now
977 * is turn off TCP_RCV_COPY_DATA, so the request
978 * will not receive any additional updates,
980 * Any remaining data from this record will
983 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
984 dprintk("RPC: XID %08x truncated request\n",
985 ntohl(transport
->tcp_xid
));
986 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
987 "tcp_offset = %u, tcp_reclen = %u\n",
988 xprt
, transport
->tcp_copied
,
989 transport
->tcp_offset
, transport
->tcp_reclen
);
993 dprintk("RPC: XID %08x read %Zd bytes\n",
994 ntohl(transport
->tcp_xid
), r
);
995 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
996 "tcp_reclen = %u\n", xprt
, transport
->tcp_copied
,
997 transport
->tcp_offset
, transport
->tcp_reclen
);
999 if (transport
->tcp_copied
== req
->rq_private_buf
.buflen
)
1000 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1001 else if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1002 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
)
1003 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1007 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1008 xprt_complete_rqst(req
->rq_task
, transport
->tcp_copied
);
1009 spin_unlock(&xprt
->transport_lock
);
1010 xs_tcp_check_fraghdr(transport
);
1013 static inline void xs_tcp_read_discard(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1017 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1018 if (len
> desc
->count
)
1021 desc
->offset
+= len
;
1022 transport
->tcp_offset
+= len
;
1023 dprintk("RPC: discarded %Zu bytes\n", len
);
1024 xs_tcp_check_fraghdr(transport
);
1027 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
1029 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
1030 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1031 struct xdr_skb_reader desc
= {
1037 dprintk("RPC: xs_tcp_data_recv started\n");
1039 /* Read in a new fragment marker if necessary */
1040 /* Can we ever really expect to get completely empty fragments? */
1041 if (transport
->tcp_flags
& TCP_RCV_COPY_FRAGHDR
) {
1042 xs_tcp_read_fraghdr(xprt
, &desc
);
1045 /* Read in the xid if necessary */
1046 if (transport
->tcp_flags
& TCP_RCV_COPY_XID
) {
1047 xs_tcp_read_xid(transport
, &desc
);
1050 /* Read in the request data */
1051 if (transport
->tcp_flags
& TCP_RCV_COPY_DATA
) {
1052 xs_tcp_read_request(xprt
, &desc
);
1055 /* Skip over any trailing bytes on short reads */
1056 xs_tcp_read_discard(transport
, &desc
);
1057 } while (desc
.count
);
1058 dprintk("RPC: xs_tcp_data_recv done\n");
1059 return len
- desc
.count
;
1063 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1064 * @sk: socket with data to read
1065 * @bytes: how much data to read
1068 static void xs_tcp_data_ready(struct sock
*sk
, int bytes
)
1070 struct rpc_xprt
*xprt
;
1071 read_descriptor_t rd_desc
;
1073 dprintk("RPC: xs_tcp_data_ready...\n");
1075 read_lock(&sk
->sk_callback_lock
);
1076 if (!(xprt
= xprt_from_sock(sk
)))
1081 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1082 rd_desc
.arg
.data
= xprt
;
1083 rd_desc
.count
= 65536;
1084 tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
1086 read_unlock(&sk
->sk_callback_lock
);
1090 * xs_tcp_state_change - callback to handle TCP socket state changes
1091 * @sk: socket whose state has changed
1094 static void xs_tcp_state_change(struct sock
*sk
)
1096 struct rpc_xprt
*xprt
;
1098 read_lock(&sk
->sk_callback_lock
);
1099 if (!(xprt
= xprt_from_sock(sk
)))
1101 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
1102 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1103 sk
->sk_state
, xprt_connected(xprt
),
1104 sock_flag(sk
, SOCK_DEAD
),
1105 sock_flag(sk
, SOCK_ZAPPED
));
1107 switch (sk
->sk_state
) {
1108 case TCP_ESTABLISHED
:
1109 spin_lock_bh(&xprt
->transport_lock
);
1110 if (!xprt_test_and_set_connected(xprt
)) {
1111 struct sock_xprt
*transport
= container_of(xprt
,
1112 struct sock_xprt
, xprt
);
1114 /* Reset TCP record info */
1115 transport
->tcp_offset
= 0;
1116 transport
->tcp_reclen
= 0;
1117 transport
->tcp_copied
= 0;
1118 transport
->tcp_flags
=
1119 TCP_RCV_COPY_FRAGHDR
| TCP_RCV_COPY_XID
;
1121 xprt_wake_pending_tasks(xprt
, 0);
1123 spin_unlock_bh(&xprt
->transport_lock
);
1126 /* The client initiated a shutdown of the socket */
1127 xprt
->reestablish_timeout
= 0;
1128 set_bit(XPRT_CLOSING
, &xprt
->state
);
1129 smp_mb__before_clear_bit();
1130 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1131 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1132 smp_mb__after_clear_bit();
1134 case TCP_CLOSE_WAIT
:
1135 /* The server initiated a shutdown of the socket */
1136 set_bit(XPRT_CLOSING
, &xprt
->state
);
1137 xprt_force_disconnect(xprt
);
1141 * If the server closed down the connection, make sure that
1142 * we back off before reconnecting
1144 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
1145 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1148 smp_mb__before_clear_bit();
1149 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1150 smp_mb__after_clear_bit();
1153 smp_mb__before_clear_bit();
1154 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1155 clear_bit(XPRT_CLOSING
, &xprt
->state
);
1156 smp_mb__after_clear_bit();
1157 /* Mark transport as closed and wake up all pending tasks */
1158 xprt_disconnect_done(xprt
);
1161 read_unlock(&sk
->sk_callback_lock
);
1165 * xs_udp_write_space - callback invoked when socket buffer space
1167 * @sk: socket whose state has changed
1169 * Called when more output buffer space is available for this socket.
1170 * We try not to wake our writers until they can make "significant"
1171 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1172 * with a bunch of small requests.
1174 static void xs_udp_write_space(struct sock
*sk
)
1176 read_lock(&sk
->sk_callback_lock
);
1178 /* from net/core/sock.c:sock_def_write_space */
1179 if (sock_writeable(sk
)) {
1180 struct socket
*sock
;
1181 struct rpc_xprt
*xprt
;
1183 if (unlikely(!(sock
= sk
->sk_socket
)))
1185 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1187 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE
, &sock
->flags
)))
1190 xprt_write_space(xprt
);
1194 read_unlock(&sk
->sk_callback_lock
);
1198 * xs_tcp_write_space - callback invoked when socket buffer space
1200 * @sk: socket whose state has changed
1202 * Called when more output buffer space is available for this socket.
1203 * We try not to wake our writers until they can make "significant"
1204 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1205 * with a bunch of small requests.
1207 static void xs_tcp_write_space(struct sock
*sk
)
1209 read_lock(&sk
->sk_callback_lock
);
1211 /* from net/core/stream.c:sk_stream_write_space */
1212 if (sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
)) {
1213 struct socket
*sock
;
1214 struct rpc_xprt
*xprt
;
1216 if (unlikely(!(sock
= sk
->sk_socket
)))
1218 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1220 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE
, &sock
->flags
)))
1223 xprt_write_space(xprt
);
1227 read_unlock(&sk
->sk_callback_lock
);
1230 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1232 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1233 struct sock
*sk
= transport
->inet
;
1235 if (transport
->rcvsize
) {
1236 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1237 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1239 if (transport
->sndsize
) {
1240 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1241 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1242 sk
->sk_write_space(sk
);
1247 * xs_udp_set_buffer_size - set send and receive limits
1248 * @xprt: generic transport
1249 * @sndsize: requested size of send buffer, in bytes
1250 * @rcvsize: requested size of receive buffer, in bytes
1252 * Set socket send and receive buffer size limits.
1254 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1256 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1258 transport
->sndsize
= 0;
1260 transport
->sndsize
= sndsize
+ 1024;
1261 transport
->rcvsize
= 0;
1263 transport
->rcvsize
= rcvsize
+ 1024;
1265 xs_udp_do_set_buffer_size(xprt
);
1269 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1270 * @task: task that timed out
1272 * Adjust the congestion window after a retransmit timeout has occurred.
1274 static void xs_udp_timer(struct rpc_task
*task
)
1276 xprt_adjust_cwnd(task
, -ETIMEDOUT
);
1279 static unsigned short xs_get_random_port(void)
1281 unsigned short range
= xprt_max_resvport
- xprt_min_resvport
;
1282 unsigned short rand
= (unsigned short) net_random() % range
;
1283 return rand
+ xprt_min_resvport
;
1287 * xs_set_port - reset the port number in the remote endpoint address
1288 * @xprt: generic transport
1289 * @port: new port number
1292 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1294 struct sockaddr
*addr
= xs_addr(xprt
);
1296 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1298 switch (addr
->sa_family
) {
1300 ((struct sockaddr_in
*)addr
)->sin_port
= htons(port
);
1303 ((struct sockaddr_in6
*)addr
)->sin6_port
= htons(port
);
1310 static unsigned short xs_get_srcport(struct sock_xprt
*transport
, struct socket
*sock
)
1312 unsigned short port
= transport
->port
;
1314 if (port
== 0 && transport
->xprt
.resvport
)
1315 port
= xs_get_random_port();
1319 static unsigned short xs_next_srcport(struct sock_xprt
*transport
, struct socket
*sock
, unsigned short port
)
1321 if (transport
->port
!= 0)
1322 transport
->port
= 0;
1323 if (!transport
->xprt
.resvport
)
1325 if (port
<= xprt_min_resvport
|| port
> xprt_max_resvport
)
1326 return xprt_max_resvport
;
1330 static int xs_bind4(struct sock_xprt
*transport
, struct socket
*sock
)
1332 struct sockaddr_in myaddr
= {
1333 .sin_family
= AF_INET
,
1335 struct sockaddr_in
*sa
;
1337 unsigned short port
= xs_get_srcport(transport
, sock
);
1338 unsigned short last
;
1340 sa
= (struct sockaddr_in
*)&transport
->addr
;
1341 myaddr
.sin_addr
= sa
->sin_addr
;
1343 myaddr
.sin_port
= htons(port
);
1344 err
= kernel_bind(sock
, (struct sockaddr
*) &myaddr
,
1349 transport
->port
= port
;
1353 port
= xs_next_srcport(transport
, sock
, port
);
1356 } while (err
== -EADDRINUSE
&& nloop
!= 2);
1357 dprintk("RPC: %s "NIPQUAD_FMT
":%u: %s (%d)\n",
1358 __FUNCTION__
, NIPQUAD(myaddr
.sin_addr
),
1359 port
, err
? "failed" : "ok", err
);
1363 static int xs_bind6(struct sock_xprt
*transport
, struct socket
*sock
)
1365 struct sockaddr_in6 myaddr
= {
1366 .sin6_family
= AF_INET6
,
1368 struct sockaddr_in6
*sa
;
1370 unsigned short port
= xs_get_srcport(transport
, sock
);
1371 unsigned short last
;
1373 sa
= (struct sockaddr_in6
*)&transport
->addr
;
1374 myaddr
.sin6_addr
= sa
->sin6_addr
;
1376 myaddr
.sin6_port
= htons(port
);
1377 err
= kernel_bind(sock
, (struct sockaddr
*) &myaddr
,
1382 transport
->port
= port
;
1386 port
= xs_next_srcport(transport
, sock
, port
);
1389 } while (err
== -EADDRINUSE
&& nloop
!= 2);
1390 dprintk("RPC: xs_bind6 "NIP6_FMT
":%u: %s (%d)\n",
1391 NIP6(myaddr
.sin6_addr
), port
, err
? "failed" : "ok", err
);
1395 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1396 static struct lock_class_key xs_key
[2];
1397 static struct lock_class_key xs_slock_key
[2];
1399 static inline void xs_reclassify_socket4(struct socket
*sock
)
1401 struct sock
*sk
= sock
->sk
;
1403 BUG_ON(sock_owned_by_user(sk
));
1404 sock_lock_init_class_and_name(sk
, "slock-AF_INET-RPC",
1405 &xs_slock_key
[0], "sk_lock-AF_INET-RPC", &xs_key
[0]);
1408 static inline void xs_reclassify_socket6(struct socket
*sock
)
1410 struct sock
*sk
= sock
->sk
;
1412 BUG_ON(sock_owned_by_user(sk
));
1413 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-RPC",
1414 &xs_slock_key
[1], "sk_lock-AF_INET6-RPC", &xs_key
[1]);
1417 static inline void xs_reclassify_socket4(struct socket
*sock
)
1421 static inline void xs_reclassify_socket6(struct socket
*sock
)
1426 static void xs_udp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
1428 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1430 if (!transport
->inet
) {
1431 struct sock
*sk
= sock
->sk
;
1433 write_lock_bh(&sk
->sk_callback_lock
);
1435 sk
->sk_user_data
= xprt
;
1436 transport
->old_data_ready
= sk
->sk_data_ready
;
1437 transport
->old_state_change
= sk
->sk_state_change
;
1438 transport
->old_write_space
= sk
->sk_write_space
;
1439 sk
->sk_data_ready
= xs_udp_data_ready
;
1440 sk
->sk_write_space
= xs_udp_write_space
;
1441 sk
->sk_no_check
= UDP_CSUM_NORCV
;
1442 sk
->sk_allocation
= GFP_ATOMIC
;
1444 xprt_set_connected(xprt
);
1446 /* Reset to new socket */
1447 transport
->sock
= sock
;
1448 transport
->inet
= sk
;
1450 write_unlock_bh(&sk
->sk_callback_lock
);
1452 xs_udp_do_set_buffer_size(xprt
);
1456 * xs_udp_connect_worker4 - set up a UDP socket
1457 * @work: RPC transport to connect
1459 * Invoked by a work queue tasklet.
1461 static void xs_udp_connect_worker4(struct work_struct
*work
)
1463 struct sock_xprt
*transport
=
1464 container_of(work
, struct sock_xprt
, connect_worker
.work
);
1465 struct rpc_xprt
*xprt
= &transport
->xprt
;
1466 struct socket
*sock
= transport
->sock
;
1467 int err
, status
= -EIO
;
1469 if (xprt
->shutdown
|| !xprt_bound(xprt
))
1472 /* Start by resetting any existing state */
1475 if ((err
= sock_create_kern(PF_INET
, SOCK_DGRAM
, IPPROTO_UDP
, &sock
)) < 0) {
1476 dprintk("RPC: can't create UDP transport socket (%d).\n", -err
);
1479 xs_reclassify_socket4(sock
);
1481 if (xs_bind4(transport
, sock
)) {
1486 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1487 xprt
, xprt
->address_strings
[RPC_DISPLAY_ALL
]);
1489 xs_udp_finish_connecting(xprt
, sock
);
1492 xprt_wake_pending_tasks(xprt
, status
);
1493 xprt_clear_connecting(xprt
);
1497 * xs_udp_connect_worker6 - set up a UDP socket
1498 * @work: RPC transport to connect
1500 * Invoked by a work queue tasklet.
1502 static void xs_udp_connect_worker6(struct work_struct
*work
)
1504 struct sock_xprt
*transport
=
1505 container_of(work
, struct sock_xprt
, connect_worker
.work
);
1506 struct rpc_xprt
*xprt
= &transport
->xprt
;
1507 struct socket
*sock
= transport
->sock
;
1508 int err
, status
= -EIO
;
1510 if (xprt
->shutdown
|| !xprt_bound(xprt
))
1513 /* Start by resetting any existing state */
1516 if ((err
= sock_create_kern(PF_INET6
, SOCK_DGRAM
, IPPROTO_UDP
, &sock
)) < 0) {
1517 dprintk("RPC: can't create UDP transport socket (%d).\n", -err
);
1520 xs_reclassify_socket6(sock
);
1522 if (xs_bind6(transport
, sock
) < 0) {
1527 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1528 xprt
, xprt
->address_strings
[RPC_DISPLAY_ALL
]);
1530 xs_udp_finish_connecting(xprt
, sock
);
1533 xprt_wake_pending_tasks(xprt
, status
);
1534 xprt_clear_connecting(xprt
);
1538 * We need to preserve the port number so the reply cache on the server can
1539 * find our cached RPC replies when we get around to reconnecting.
1541 static void xs_tcp_reuse_connection(struct rpc_xprt
*xprt
)
1544 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1545 struct sockaddr any
;
1547 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt
);
1550 * Disconnect the transport socket by doing a connect operation
1551 * with AF_UNSPEC. This should return immediately...
1553 memset(&any
, 0, sizeof(any
));
1554 any
.sa_family
= AF_UNSPEC
;
1555 result
= kernel_connect(transport
->sock
, &any
, sizeof(any
), 0);
1557 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1561 static int xs_tcp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
1563 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1565 if (!transport
->inet
) {
1566 struct sock
*sk
= sock
->sk
;
1568 write_lock_bh(&sk
->sk_callback_lock
);
1570 sk
->sk_user_data
= xprt
;
1571 transport
->old_data_ready
= sk
->sk_data_ready
;
1572 transport
->old_state_change
= sk
->sk_state_change
;
1573 transport
->old_write_space
= sk
->sk_write_space
;
1574 sk
->sk_data_ready
= xs_tcp_data_ready
;
1575 sk
->sk_state_change
= xs_tcp_state_change
;
1576 sk
->sk_write_space
= xs_tcp_write_space
;
1577 sk
->sk_allocation
= GFP_ATOMIC
;
1579 /* socket options */
1580 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
1581 sock_reset_flag(sk
, SOCK_LINGER
);
1582 tcp_sk(sk
)->linger2
= 0;
1583 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
1585 xprt_clear_connected(xprt
);
1587 /* Reset to new socket */
1588 transport
->sock
= sock
;
1589 transport
->inet
= sk
;
1591 write_unlock_bh(&sk
->sk_callback_lock
);
1594 /* Tell the socket layer to start connecting... */
1595 xprt
->stat
.connect_count
++;
1596 xprt
->stat
.connect_start
= jiffies
;
1597 return kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, O_NONBLOCK
);
1601 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1602 * @work: RPC transport to connect
1604 * Invoked by a work queue tasklet.
1606 static void xs_tcp_connect_worker4(struct work_struct
*work
)
1608 struct sock_xprt
*transport
=
1609 container_of(work
, struct sock_xprt
, connect_worker
.work
);
1610 struct rpc_xprt
*xprt
= &transport
->xprt
;
1611 struct socket
*sock
= transport
->sock
;
1612 int err
, status
= -EIO
;
1614 if (xprt
->shutdown
|| !xprt_bound(xprt
))
1618 /* start from scratch */
1619 if ((err
= sock_create_kern(PF_INET
, SOCK_STREAM
, IPPROTO_TCP
, &sock
)) < 0) {
1620 dprintk("RPC: can't create TCP transport socket (%d).\n", -err
);
1623 xs_reclassify_socket4(sock
);
1625 if (xs_bind4(transport
, sock
) < 0) {
1630 /* "close" the socket, preserving the local port */
1631 xs_tcp_reuse_connection(xprt
);
1633 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1634 xprt
, xprt
->address_strings
[RPC_DISPLAY_ALL
]);
1636 status
= xs_tcp_finish_connecting(xprt
, sock
);
1637 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1638 xprt
, -status
, xprt_connected(xprt
),
1639 sock
->sk
->sk_state
);
1647 /* retry with existing socket, after a delay */
1650 /* get rid of existing socket, and retry */
1651 xs_tcp_shutdown(xprt
);
1655 xprt_wake_pending_tasks(xprt
, status
);
1657 xprt_clear_connecting(xprt
);
1661 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1662 * @work: RPC transport to connect
1664 * Invoked by a work queue tasklet.
1666 static void xs_tcp_connect_worker6(struct work_struct
*work
)
1668 struct sock_xprt
*transport
=
1669 container_of(work
, struct sock_xprt
, connect_worker
.work
);
1670 struct rpc_xprt
*xprt
= &transport
->xprt
;
1671 struct socket
*sock
= transport
->sock
;
1672 int err
, status
= -EIO
;
1674 if (xprt
->shutdown
|| !xprt_bound(xprt
))
1678 /* start from scratch */
1679 if ((err
= sock_create_kern(PF_INET6
, SOCK_STREAM
, IPPROTO_TCP
, &sock
)) < 0) {
1680 dprintk("RPC: can't create TCP transport socket (%d).\n", -err
);
1683 xs_reclassify_socket6(sock
);
1685 if (xs_bind6(transport
, sock
) < 0) {
1690 /* "close" the socket, preserving the local port */
1691 xs_tcp_reuse_connection(xprt
);
1693 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1694 xprt
, xprt
->address_strings
[RPC_DISPLAY_ALL
]);
1696 status
= xs_tcp_finish_connecting(xprt
, sock
);
1697 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1698 xprt
, -status
, xprt_connected(xprt
), sock
->sk
->sk_state
);
1706 /* retry with existing socket, after a delay */
1709 /* get rid of existing socket, and retry */
1710 xs_tcp_shutdown(xprt
);
1714 xprt_wake_pending_tasks(xprt
, status
);
1716 xprt_clear_connecting(xprt
);
1720 * xs_connect - connect a socket to a remote endpoint
1721 * @task: address of RPC task that manages state of connect request
1723 * TCP: If the remote end dropped the connection, delay reconnecting.
1725 * UDP socket connects are synchronous, but we use a work queue anyway
1726 * to guarantee that even unprivileged user processes can set up a
1727 * socket on a privileged port.
1729 * If a UDP socket connect fails, the delay behavior here prevents
1730 * retry floods (hard mounts).
1732 static void xs_connect(struct rpc_task
*task
)
1734 struct rpc_xprt
*xprt
= task
->tk_xprt
;
1735 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1737 if (xprt_test_and_set_connecting(xprt
))
1740 if (transport
->sock
!= NULL
) {
1741 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1743 xprt
, xprt
->reestablish_timeout
/ HZ
);
1744 queue_delayed_work(rpciod_workqueue
,
1745 &transport
->connect_worker
,
1746 xprt
->reestablish_timeout
);
1747 xprt
->reestablish_timeout
<<= 1;
1748 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
1749 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
1751 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
1752 queue_delayed_work(rpciod_workqueue
,
1753 &transport
->connect_worker
, 0);
1757 static void xs_tcp_connect(struct rpc_task
*task
)
1759 struct rpc_xprt
*xprt
= task
->tk_xprt
;
1761 /* Initiate graceful shutdown of the socket if not already done */
1762 if (test_bit(XPRT_CONNECTED
, &xprt
->state
))
1763 xs_tcp_shutdown(xprt
);
1764 /* Exit if we need to wait for socket shutdown to complete */
1765 if (test_bit(XPRT_CLOSING
, &xprt
->state
))
1771 * xs_udp_print_stats - display UDP socket-specifc stats
1772 * @xprt: rpc_xprt struct containing statistics
1776 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
1778 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1780 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1782 xprt
->stat
.bind_count
,
1785 xprt
->stat
.bad_xids
,
1787 xprt
->stat
.bklog_u
);
1791 * xs_tcp_print_stats - display TCP socket-specifc stats
1792 * @xprt: rpc_xprt struct containing statistics
1796 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
1798 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1801 if (xprt_connected(xprt
))
1802 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
1804 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1806 xprt
->stat
.bind_count
,
1807 xprt
->stat
.connect_count
,
1808 xprt
->stat
.connect_time
,
1812 xprt
->stat
.bad_xids
,
1814 xprt
->stat
.bklog_u
);
1817 static struct rpc_xprt_ops xs_udp_ops
= {
1818 .set_buffer_size
= xs_udp_set_buffer_size
,
1819 .reserve_xprt
= xprt_reserve_xprt_cong
,
1820 .release_xprt
= xprt_release_xprt_cong
,
1821 .rpcbind
= rpcb_getport_async
,
1822 .set_port
= xs_set_port
,
1823 .connect
= xs_connect
,
1824 .buf_alloc
= rpc_malloc
,
1825 .buf_free
= rpc_free
,
1826 .send_request
= xs_udp_send_request
,
1827 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
1828 .timer
= xs_udp_timer
,
1829 .release_request
= xprt_release_rqst_cong
,
1831 .destroy
= xs_destroy
,
1832 .print_stats
= xs_udp_print_stats
,
1835 static struct rpc_xprt_ops xs_tcp_ops
= {
1836 .reserve_xprt
= xprt_reserve_xprt
,
1837 .release_xprt
= xs_tcp_release_xprt
,
1838 .rpcbind
= rpcb_getport_async
,
1839 .set_port
= xs_set_port
,
1840 .connect
= xs_tcp_connect
,
1841 .buf_alloc
= rpc_malloc
,
1842 .buf_free
= rpc_free
,
1843 .send_request
= xs_tcp_send_request
,
1844 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
1845 .close
= xs_tcp_shutdown
,
1846 .destroy
= xs_destroy
,
1847 .print_stats
= xs_tcp_print_stats
,
1850 static struct rpc_xprt
*xs_setup_xprt(struct xprt_create
*args
,
1851 unsigned int slot_table_size
)
1853 struct rpc_xprt
*xprt
;
1854 struct sock_xprt
*new;
1856 if (args
->addrlen
> sizeof(xprt
->addr
)) {
1857 dprintk("RPC: xs_setup_xprt: address too large\n");
1858 return ERR_PTR(-EBADF
);
1861 new = kzalloc(sizeof(*new), GFP_KERNEL
);
1863 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1865 return ERR_PTR(-ENOMEM
);
1869 xprt
->max_reqs
= slot_table_size
;
1870 xprt
->slot
= kcalloc(xprt
->max_reqs
, sizeof(struct rpc_rqst
), GFP_KERNEL
);
1871 if (xprt
->slot
== NULL
) {
1873 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1875 return ERR_PTR(-ENOMEM
);
1878 memcpy(&xprt
->addr
, args
->dstaddr
, args
->addrlen
);
1879 xprt
->addrlen
= args
->addrlen
;
1881 memcpy(&new->addr
, args
->srcaddr
, args
->addrlen
);
1886 static const struct rpc_timeout xs_udp_default_timeout
= {
1887 .to_initval
= 5 * HZ
,
1888 .to_maxval
= 30 * HZ
,
1889 .to_increment
= 5 * HZ
,
1894 * xs_setup_udp - Set up transport to use a UDP socket
1895 * @args: rpc transport creation arguments
1898 static struct rpc_xprt
*xs_setup_udp(struct xprt_create
*args
)
1900 struct sockaddr
*addr
= args
->dstaddr
;
1901 struct rpc_xprt
*xprt
;
1902 struct sock_xprt
*transport
;
1904 xprt
= xs_setup_xprt(args
, xprt_udp_slot_table_entries
);
1907 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1909 xprt
->prot
= IPPROTO_UDP
;
1911 /* XXX: header size can vary due to auth type, IPv6, etc. */
1912 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
1914 xprt
->bind_timeout
= XS_BIND_TO
;
1915 xprt
->connect_timeout
= XS_UDP_CONN_TO
;
1916 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
1917 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
1919 xprt
->ops
= &xs_udp_ops
;
1921 xprt
->timeout
= &xs_udp_default_timeout
;
1923 switch (addr
->sa_family
) {
1925 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
1926 xprt_set_bound(xprt
);
1928 INIT_DELAYED_WORK(&transport
->connect_worker
,
1929 xs_udp_connect_worker4
);
1930 xs_format_ipv4_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP
);
1933 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
1934 xprt_set_bound(xprt
);
1936 INIT_DELAYED_WORK(&transport
->connect_worker
,
1937 xs_udp_connect_worker6
);
1938 xs_format_ipv6_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP6
);
1942 return ERR_PTR(-EAFNOSUPPORT
);
1945 dprintk("RPC: set up transport to address %s\n",
1946 xprt
->address_strings
[RPC_DISPLAY_ALL
]);
1948 if (try_module_get(THIS_MODULE
))
1953 return ERR_PTR(-EINVAL
);
1956 static const struct rpc_timeout xs_tcp_default_timeout
= {
1957 .to_initval
= 60 * HZ
,
1958 .to_maxval
= 60 * HZ
,
1963 * xs_setup_tcp - Set up transport to use a TCP socket
1964 * @args: rpc transport creation arguments
1967 static struct rpc_xprt
*xs_setup_tcp(struct xprt_create
*args
)
1969 struct sockaddr
*addr
= args
->dstaddr
;
1970 struct rpc_xprt
*xprt
;
1971 struct sock_xprt
*transport
;
1973 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
);
1976 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1978 xprt
->prot
= IPPROTO_TCP
;
1979 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
1980 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
1982 xprt
->bind_timeout
= XS_BIND_TO
;
1983 xprt
->connect_timeout
= XS_TCP_CONN_TO
;
1984 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1985 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
1987 xprt
->ops
= &xs_tcp_ops
;
1988 xprt
->timeout
= &xs_tcp_default_timeout
;
1990 switch (addr
->sa_family
) {
1992 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
1993 xprt_set_bound(xprt
);
1995 INIT_DELAYED_WORK(&transport
->connect_worker
, xs_tcp_connect_worker4
);
1996 xs_format_ipv4_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP
);
1999 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2000 xprt_set_bound(xprt
);
2002 INIT_DELAYED_WORK(&transport
->connect_worker
, xs_tcp_connect_worker6
);
2003 xs_format_ipv6_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP6
);
2007 return ERR_PTR(-EAFNOSUPPORT
);
2010 dprintk("RPC: set up transport to address %s\n",
2011 xprt
->address_strings
[RPC_DISPLAY_ALL
]);
2013 if (try_module_get(THIS_MODULE
))
2018 return ERR_PTR(-EINVAL
);
2021 static struct xprt_class xs_udp_transport
= {
2022 .list
= LIST_HEAD_INIT(xs_udp_transport
.list
),
2024 .owner
= THIS_MODULE
,
2025 .ident
= IPPROTO_UDP
,
2026 .setup
= xs_setup_udp
,
2029 static struct xprt_class xs_tcp_transport
= {
2030 .list
= LIST_HEAD_INIT(xs_tcp_transport
.list
),
2032 .owner
= THIS_MODULE
,
2033 .ident
= IPPROTO_TCP
,
2034 .setup
= xs_setup_tcp
,
2038 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2041 int init_socket_xprt(void)
2044 if (!sunrpc_table_header
)
2045 sunrpc_table_header
= register_sysctl_table(sunrpc_table
);
2048 xprt_register_transport(&xs_udp_transport
);
2049 xprt_register_transport(&xs_tcp_transport
);
2055 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2058 void cleanup_socket_xprt(void)
2061 if (sunrpc_table_header
) {
2062 unregister_sysctl_table(sunrpc_table_header
);
2063 sunrpc_table_header
= NULL
;
2067 xprt_unregister_transport(&xs_udp_transport
);
2068 xprt_unregister_transport(&xs_tcp_transport
);