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/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/svcsock.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/file.h>
38 #ifdef CONFIG_NFS_V4_1
39 #include <linux/sunrpc/bc_xprt.h>
43 #include <net/checksum.h>
51 unsigned int xprt_udp_slot_table_entries
= RPC_DEF_SLOT_TABLE
;
52 unsigned int xprt_tcp_slot_table_entries
= RPC_DEF_SLOT_TABLE
;
54 unsigned int xprt_min_resvport
= RPC_DEF_MIN_RESVPORT
;
55 unsigned int xprt_max_resvport
= RPC_DEF_MAX_RESVPORT
;
57 #define XS_TCP_LINGER_TO (15U * HZ)
58 static unsigned int xs_tcp_fin_timeout __read_mostly
= XS_TCP_LINGER_TO
;
61 * We can register our own files under /proc/sys/sunrpc by
62 * calling register_sysctl_table() again. The files in that
63 * directory become the union of all files registered there.
65 * We simply need to make sure that we don't collide with
66 * someone else's file names!
71 static unsigned int min_slot_table_size
= RPC_MIN_SLOT_TABLE
;
72 static unsigned int max_slot_table_size
= RPC_MAX_SLOT_TABLE
;
73 static unsigned int xprt_min_resvport_limit
= RPC_MIN_RESVPORT
;
74 static unsigned int xprt_max_resvport_limit
= RPC_MAX_RESVPORT
;
76 static struct ctl_table_header
*sunrpc_table_header
;
79 * FIXME: changing the UDP slot table size should also resize the UDP
80 * socket buffers for existing UDP transports
82 static ctl_table xs_tunables_table
[] = {
84 .procname
= "udp_slot_table_entries",
85 .data
= &xprt_udp_slot_table_entries
,
86 .maxlen
= sizeof(unsigned int),
88 .proc_handler
= proc_dointvec_minmax
,
89 .extra1
= &min_slot_table_size
,
90 .extra2
= &max_slot_table_size
93 .procname
= "tcp_slot_table_entries",
94 .data
= &xprt_tcp_slot_table_entries
,
95 .maxlen
= sizeof(unsigned int),
97 .proc_handler
= proc_dointvec_minmax
,
98 .extra1
= &min_slot_table_size
,
99 .extra2
= &max_slot_table_size
102 .procname
= "min_resvport",
103 .data
= &xprt_min_resvport
,
104 .maxlen
= sizeof(unsigned int),
106 .proc_handler
= proc_dointvec_minmax
,
107 .extra1
= &xprt_min_resvport_limit
,
108 .extra2
= &xprt_max_resvport_limit
111 .procname
= "max_resvport",
112 .data
= &xprt_max_resvport
,
113 .maxlen
= sizeof(unsigned int),
115 .proc_handler
= proc_dointvec_minmax
,
116 .extra1
= &xprt_min_resvport_limit
,
117 .extra2
= &xprt_max_resvport_limit
120 .procname
= "tcp_fin_timeout",
121 .data
= &xs_tcp_fin_timeout
,
122 .maxlen
= sizeof(xs_tcp_fin_timeout
),
124 .proc_handler
= proc_dointvec_jiffies
,
129 static ctl_table sunrpc_table
[] = {
131 .procname
= "sunrpc",
133 .child
= xs_tunables_table
141 * Wait duration for a reply from the RPC portmapper.
143 #define XS_BIND_TO (60U * HZ)
146 * Delay if a UDP socket connect error occurs. This is most likely some
147 * kind of resource problem on the local host.
149 #define XS_UDP_REEST_TO (2U * HZ)
152 * The reestablish timeout allows clients to delay for a bit before attempting
153 * to reconnect to a server that just dropped our connection.
155 * We implement an exponential backoff when trying to reestablish a TCP
156 * transport connection with the server. Some servers like to drop a TCP
157 * connection when they are overworked, so we start with a short timeout and
158 * increase over time if the server is down or not responding.
160 #define XS_TCP_INIT_REEST_TO (3U * HZ)
161 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
164 * TCP idle timeout; client drops the transport socket if it is idle
165 * for this long. Note that we also timeout UDP sockets to prevent
166 * holding port numbers when there is no RPC traffic.
168 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
171 # undef RPC_DEBUG_DATA
172 # define RPCDBG_FACILITY RPCDBG_TRANS
175 #ifdef RPC_DEBUG_DATA
176 static void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
178 u8
*buf
= (u8
*) packet
;
181 dprintk("RPC: %s\n", msg
);
182 for (j
= 0; j
< count
&& j
< 128; j
+= 4) {
186 dprintk("0x%04x ", j
);
188 dprintk("%02x%02x%02x%02x ",
189 buf
[j
], buf
[j
+1], buf
[j
+2], buf
[j
+3]);
194 static inline void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
201 struct rpc_xprt xprt
;
206 struct socket
* sock
;
210 * State of TCP reply receive
219 unsigned long tcp_copied
,
223 * Connection of transports
225 struct delayed_work connect_worker
;
226 struct sockaddr_storage srcaddr
;
227 unsigned short srcport
;
230 * UDP socket buffer size parameters
236 * Saved socket callback addresses
238 void (*old_data_ready
)(struct sock
*, int);
239 void (*old_state_change
)(struct sock
*);
240 void (*old_write_space
)(struct sock
*);
241 void (*old_error_report
)(struct sock
*);
245 * TCP receive state flags
247 #define TCP_RCV_LAST_FRAG (1UL << 0)
248 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
249 #define TCP_RCV_COPY_XID (1UL << 2)
250 #define TCP_RCV_COPY_DATA (1UL << 3)
251 #define TCP_RCV_READ_CALLDIR (1UL << 4)
252 #define TCP_RCV_COPY_CALLDIR (1UL << 5)
257 #define TCP_RPC_REPLY (1UL << 6)
259 static inline struct sockaddr
*xs_addr(struct rpc_xprt
*xprt
)
261 return (struct sockaddr
*) &xprt
->addr
;
264 static inline struct sockaddr_in
*xs_addr_in(struct rpc_xprt
*xprt
)
266 return (struct sockaddr_in
*) &xprt
->addr
;
269 static inline struct sockaddr_in6
*xs_addr_in6(struct rpc_xprt
*xprt
)
271 return (struct sockaddr_in6
*) &xprt
->addr
;
274 static void xs_format_common_peer_addresses(struct rpc_xprt
*xprt
)
276 struct sockaddr
*sap
= xs_addr(xprt
);
277 struct sockaddr_in6
*sin6
;
278 struct sockaddr_in
*sin
;
281 (void)rpc_ntop(sap
, buf
, sizeof(buf
));
282 xprt
->address_strings
[RPC_DISPLAY_ADDR
] = kstrdup(buf
, GFP_KERNEL
);
284 switch (sap
->sa_family
) {
286 sin
= xs_addr_in(xprt
);
287 snprintf(buf
, sizeof(buf
), "%08x", ntohl(sin
->sin_addr
.s_addr
));
290 sin6
= xs_addr_in6(xprt
);
291 snprintf(buf
, sizeof(buf
), "%pi6", &sin6
->sin6_addr
);
296 xprt
->address_strings
[RPC_DISPLAY_HEX_ADDR
] = kstrdup(buf
, GFP_KERNEL
);
299 static void xs_format_common_peer_ports(struct rpc_xprt
*xprt
)
301 struct sockaddr
*sap
= xs_addr(xprt
);
304 snprintf(buf
, sizeof(buf
), "%u", rpc_get_port(sap
));
305 xprt
->address_strings
[RPC_DISPLAY_PORT
] = kstrdup(buf
, GFP_KERNEL
);
307 snprintf(buf
, sizeof(buf
), "%4hx", rpc_get_port(sap
));
308 xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
] = kstrdup(buf
, GFP_KERNEL
);
311 static void xs_format_peer_addresses(struct rpc_xprt
*xprt
,
312 const char *protocol
,
315 xprt
->address_strings
[RPC_DISPLAY_PROTO
] = protocol
;
316 xprt
->address_strings
[RPC_DISPLAY_NETID
] = netid
;
317 xs_format_common_peer_addresses(xprt
);
318 xs_format_common_peer_ports(xprt
);
321 static void xs_update_peer_port(struct rpc_xprt
*xprt
)
323 kfree(xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
]);
324 kfree(xprt
->address_strings
[RPC_DISPLAY_PORT
]);
326 xs_format_common_peer_ports(xprt
);
329 static void xs_free_peer_addresses(struct rpc_xprt
*xprt
)
333 for (i
= 0; i
< RPC_DISPLAY_MAX
; i
++)
335 case RPC_DISPLAY_PROTO
:
336 case RPC_DISPLAY_NETID
:
339 kfree(xprt
->address_strings
[i
]);
343 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
345 static int xs_send_kvec(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct kvec
*vec
, unsigned int base
, int more
)
347 struct msghdr msg
= {
349 .msg_namelen
= addrlen
,
350 .msg_flags
= XS_SENDMSG_FLAGS
| (more
? MSG_MORE
: 0),
353 .iov_base
= vec
->iov_base
+ base
,
354 .iov_len
= vec
->iov_len
- base
,
357 if (iov
.iov_len
!= 0)
358 return kernel_sendmsg(sock
, &msg
, &iov
, 1, iov
.iov_len
);
359 return kernel_sendmsg(sock
, &msg
, NULL
, 0, 0);
362 static int xs_send_pagedata(struct socket
*sock
, struct xdr_buf
*xdr
, unsigned int base
, int more
)
365 unsigned int remainder
;
368 remainder
= xdr
->page_len
- base
;
369 base
+= xdr
->page_base
;
370 ppage
= xdr
->pages
+ (base
>> PAGE_SHIFT
);
373 unsigned int len
= min_t(unsigned int, PAGE_SIZE
- base
, remainder
);
374 int flags
= XS_SENDMSG_FLAGS
;
377 if (remainder
!= 0 || more
)
379 err
= sock
->ops
->sendpage(sock
, *ppage
, base
, len
, flags
);
380 if (remainder
== 0 || err
!= len
)
394 * xs_sendpages - write pages directly to a socket
395 * @sock: socket to send on
396 * @addr: UDP only -- address of destination
397 * @addrlen: UDP only -- length of destination address
398 * @xdr: buffer containing this request
399 * @base: starting position in the buffer
402 static int xs_sendpages(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct xdr_buf
*xdr
, unsigned int base
)
404 unsigned int remainder
= xdr
->len
- base
;
410 clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
);
416 if (base
< xdr
->head
[0].iov_len
|| addr
!= NULL
) {
417 unsigned int len
= xdr
->head
[0].iov_len
- base
;
419 err
= xs_send_kvec(sock
, addr
, addrlen
, &xdr
->head
[0], base
, remainder
!= 0);
420 if (remainder
== 0 || err
!= len
)
425 base
-= xdr
->head
[0].iov_len
;
427 if (base
< xdr
->page_len
) {
428 unsigned int len
= xdr
->page_len
- base
;
430 err
= xs_send_pagedata(sock
, xdr
, base
, remainder
!= 0);
431 if (remainder
== 0 || err
!= len
)
436 base
-= xdr
->page_len
;
438 if (base
>= xdr
->tail
[0].iov_len
)
440 err
= xs_send_kvec(sock
, NULL
, 0, &xdr
->tail
[0], base
, 0);
449 static void xs_nospace_callback(struct rpc_task
*task
)
451 struct sock_xprt
*transport
= container_of(task
->tk_rqstp
->rq_xprt
, struct sock_xprt
, xprt
);
453 transport
->inet
->sk_write_pending
--;
454 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
458 * xs_nospace - place task on wait queue if transmit was incomplete
459 * @task: task to put to sleep
462 static int xs_nospace(struct rpc_task
*task
)
464 struct rpc_rqst
*req
= task
->tk_rqstp
;
465 struct rpc_xprt
*xprt
= req
->rq_xprt
;
466 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
469 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
470 task
->tk_pid
, req
->rq_slen
- req
->rq_bytes_sent
,
473 /* Protect against races with write_space */
474 spin_lock_bh(&xprt
->transport_lock
);
476 /* Don't race with disconnect */
477 if (xprt_connected(xprt
)) {
478 if (test_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
)) {
481 * Notify TCP that we're limited by the application
484 set_bit(SOCK_NOSPACE
, &transport
->sock
->flags
);
485 transport
->inet
->sk_write_pending
++;
486 /* ...and wait for more buffer space */
487 xprt_wait_for_buffer_space(task
, xs_nospace_callback
);
490 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
494 spin_unlock_bh(&xprt
->transport_lock
);
499 * xs_udp_send_request - write an RPC request to a UDP socket
500 * @task: address of RPC task that manages the state of an RPC request
503 * 0: The request has been sent
504 * EAGAIN: The socket was blocked, please call again later to
505 * complete the request
506 * ENOTCONN: Caller needs to invoke connect logic then call again
507 * other: Some other error occured, the request was not sent
509 static int xs_udp_send_request(struct rpc_task
*task
)
511 struct rpc_rqst
*req
= task
->tk_rqstp
;
512 struct rpc_xprt
*xprt
= req
->rq_xprt
;
513 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
514 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
517 xs_pktdump("packet data:",
518 req
->rq_svec
->iov_base
,
519 req
->rq_svec
->iov_len
);
521 if (!xprt_bound(xprt
))
523 status
= xs_sendpages(transport
->sock
,
528 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
529 xdr
->len
- req
->rq_bytes_sent
, status
);
532 req
->rq_xmit_bytes_sent
+= status
;
533 if (status
>= req
->rq_slen
)
535 /* Still some bytes left; set up for a retry later. */
542 /* Should we call xs_close() here? */
545 status
= xs_nospace(task
);
548 dprintk("RPC: sendmsg returned unrecognized error %d\n",
553 /* When the server has died, an ICMP port unreachable message
554 * prompts ECONNREFUSED. */
555 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
562 * xs_tcp_shutdown - gracefully shut down a TCP socket
565 * Initiates a graceful shutdown of the TCP socket by calling the
566 * equivalent of shutdown(SHUT_WR);
568 static void xs_tcp_shutdown(struct rpc_xprt
*xprt
)
570 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
571 struct socket
*sock
= transport
->sock
;
574 kernel_sock_shutdown(sock
, SHUT_WR
);
577 static inline void xs_encode_tcp_record_marker(struct xdr_buf
*buf
)
579 u32 reclen
= buf
->len
- sizeof(rpc_fraghdr
);
580 rpc_fraghdr
*base
= buf
->head
[0].iov_base
;
581 *base
= htonl(RPC_LAST_STREAM_FRAGMENT
| reclen
);
585 * xs_tcp_send_request - write an RPC request to a TCP socket
586 * @task: address of RPC task that manages the state of an RPC request
589 * 0: The request has been sent
590 * EAGAIN: The socket was blocked, please call again later to
591 * complete the request
592 * ENOTCONN: Caller needs to invoke connect logic then call again
593 * other: Some other error occured, the request was not sent
595 * XXX: In the case of soft timeouts, should we eventually give up
596 * if sendmsg is not able to make progress?
598 static int xs_tcp_send_request(struct rpc_task
*task
)
600 struct rpc_rqst
*req
= task
->tk_rqstp
;
601 struct rpc_xprt
*xprt
= req
->rq_xprt
;
602 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
603 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
606 xs_encode_tcp_record_marker(&req
->rq_snd_buf
);
608 xs_pktdump("packet data:",
609 req
->rq_svec
->iov_base
,
610 req
->rq_svec
->iov_len
);
612 /* Continue transmitting the packet/record. We must be careful
613 * to cope with writespace callbacks arriving _after_ we have
614 * called sendmsg(). */
616 status
= xs_sendpages(transport
->sock
,
617 NULL
, 0, xdr
, req
->rq_bytes_sent
);
619 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
620 xdr
->len
- req
->rq_bytes_sent
, status
);
622 if (unlikely(status
< 0))
625 /* If we've sent the entire packet, immediately
626 * reset the count of bytes sent. */
627 req
->rq_bytes_sent
+= status
;
628 req
->rq_xmit_bytes_sent
+= status
;
629 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
630 req
->rq_bytes_sent
= 0;
643 /* Should we call xs_close() here? */
646 status
= xs_nospace(task
);
649 dprintk("RPC: sendmsg returned unrecognized error %d\n",
653 xs_tcp_shutdown(xprt
);
656 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
663 * xs_tcp_release_xprt - clean up after a tcp transmission
667 * This cleans up if an error causes us to abort the transmission of a request.
668 * In this case, the socket may need to be reset in order to avoid confusing
671 static void xs_tcp_release_xprt(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
673 struct rpc_rqst
*req
;
675 if (task
!= xprt
->snd_task
)
679 req
= task
->tk_rqstp
;
680 if (req
->rq_bytes_sent
== 0)
682 if (req
->rq_bytes_sent
== req
->rq_snd_buf
.len
)
684 set_bit(XPRT_CLOSE_WAIT
, &task
->tk_xprt
->state
);
686 xprt_release_xprt(xprt
, task
);
689 static void xs_save_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
691 transport
->old_data_ready
= sk
->sk_data_ready
;
692 transport
->old_state_change
= sk
->sk_state_change
;
693 transport
->old_write_space
= sk
->sk_write_space
;
694 transport
->old_error_report
= sk
->sk_error_report
;
697 static void xs_restore_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
699 sk
->sk_data_ready
= transport
->old_data_ready
;
700 sk
->sk_state_change
= transport
->old_state_change
;
701 sk
->sk_write_space
= transport
->old_write_space
;
702 sk
->sk_error_report
= transport
->old_error_report
;
705 static void xs_reset_transport(struct sock_xprt
*transport
)
707 struct socket
*sock
= transport
->sock
;
708 struct sock
*sk
= transport
->inet
;
713 write_lock_bh(&sk
->sk_callback_lock
);
714 transport
->inet
= NULL
;
715 transport
->sock
= NULL
;
717 sk
->sk_user_data
= NULL
;
719 xs_restore_old_callbacks(transport
, sk
);
720 write_unlock_bh(&sk
->sk_callback_lock
);
728 * xs_close - close a socket
731 * This is used when all requests are complete; ie, no DRC state remains
732 * on the server we want to save.
734 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
735 * xs_reset_transport() zeroing the socket from underneath a writer.
737 static void xs_close(struct rpc_xprt
*xprt
)
739 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
741 dprintk("RPC: xs_close xprt %p\n", xprt
);
743 xs_reset_transport(transport
);
744 xprt
->reestablish_timeout
= 0;
746 smp_mb__before_clear_bit();
747 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
748 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
749 clear_bit(XPRT_CLOSING
, &xprt
->state
);
750 smp_mb__after_clear_bit();
751 xprt_disconnect_done(xprt
);
754 static void xs_tcp_close(struct rpc_xprt
*xprt
)
756 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
))
759 xs_tcp_shutdown(xprt
);
763 * xs_destroy - prepare to shutdown a transport
764 * @xprt: doomed transport
767 static void xs_destroy(struct rpc_xprt
*xprt
)
769 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
771 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
773 cancel_rearming_delayed_work(&transport
->connect_worker
);
776 xs_free_peer_addresses(xprt
);
778 module_put(THIS_MODULE
);
781 static inline struct rpc_xprt
*xprt_from_sock(struct sock
*sk
)
783 return (struct rpc_xprt
*) sk
->sk_user_data
;
787 * xs_udp_data_ready - "data ready" callback for UDP sockets
788 * @sk: socket with data to read
789 * @len: how much data to read
792 static void xs_udp_data_ready(struct sock
*sk
, int len
)
794 struct rpc_task
*task
;
795 struct rpc_xprt
*xprt
;
796 struct rpc_rqst
*rovr
;
798 int err
, repsize
, copied
;
802 read_lock(&sk
->sk_callback_lock
);
803 dprintk("RPC: xs_udp_data_ready...\n");
804 if (!(xprt
= xprt_from_sock(sk
)))
807 if ((skb
= skb_recv_datagram(sk
, 0, 1, &err
)) == NULL
)
813 repsize
= skb
->len
- sizeof(struct udphdr
);
815 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
819 /* Copy the XID from the skb... */
820 xp
= skb_header_pointer(skb
, sizeof(struct udphdr
),
821 sizeof(_xid
), &_xid
);
825 /* Look up and lock the request corresponding to the given XID */
826 spin_lock(&xprt
->transport_lock
);
827 rovr
= xprt_lookup_rqst(xprt
, *xp
);
830 task
= rovr
->rq_task
;
832 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
835 /* Suck it into the iovec, verify checksum if not done by hw. */
836 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
837 UDPX_INC_STATS_BH(sk
, UDP_MIB_INERRORS
);
841 UDPX_INC_STATS_BH(sk
, UDP_MIB_INDATAGRAMS
);
843 /* Something worked... */
844 dst_confirm(skb_dst(skb
));
846 xprt_adjust_cwnd(task
, copied
);
847 xprt_complete_rqst(task
, copied
);
850 spin_unlock(&xprt
->transport_lock
);
852 skb_free_datagram(sk
, skb
);
854 read_unlock(&sk
->sk_callback_lock
);
857 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
859 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
863 p
= ((char *) &transport
->tcp_fraghdr
) + transport
->tcp_offset
;
864 len
= sizeof(transport
->tcp_fraghdr
) - transport
->tcp_offset
;
865 used
= xdr_skb_read_bits(desc
, p
, len
);
866 transport
->tcp_offset
+= used
;
870 transport
->tcp_reclen
= ntohl(transport
->tcp_fraghdr
);
871 if (transport
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
872 transport
->tcp_flags
|= TCP_RCV_LAST_FRAG
;
874 transport
->tcp_flags
&= ~TCP_RCV_LAST_FRAG
;
875 transport
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
877 transport
->tcp_flags
&= ~TCP_RCV_COPY_FRAGHDR
;
878 transport
->tcp_offset
= 0;
880 /* Sanity check of the record length */
881 if (unlikely(transport
->tcp_reclen
< 8)) {
882 dprintk("RPC: invalid TCP record fragment length\n");
883 xprt_force_disconnect(xprt
);
886 dprintk("RPC: reading TCP record fragment of length %d\n",
887 transport
->tcp_reclen
);
890 static void xs_tcp_check_fraghdr(struct sock_xprt
*transport
)
892 if (transport
->tcp_offset
== transport
->tcp_reclen
) {
893 transport
->tcp_flags
|= TCP_RCV_COPY_FRAGHDR
;
894 transport
->tcp_offset
= 0;
895 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
) {
896 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
897 transport
->tcp_flags
|= TCP_RCV_COPY_XID
;
898 transport
->tcp_copied
= 0;
903 static inline void xs_tcp_read_xid(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
908 len
= sizeof(transport
->tcp_xid
) - transport
->tcp_offset
;
909 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
910 p
= ((char *) &transport
->tcp_xid
) + transport
->tcp_offset
;
911 used
= xdr_skb_read_bits(desc
, p
, len
);
912 transport
->tcp_offset
+= used
;
915 transport
->tcp_flags
&= ~TCP_RCV_COPY_XID
;
916 transport
->tcp_flags
|= TCP_RCV_READ_CALLDIR
;
917 transport
->tcp_copied
= 4;
918 dprintk("RPC: reading %s XID %08x\n",
919 (transport
->tcp_flags
& TCP_RPC_REPLY
) ? "reply for"
921 ntohl(transport
->tcp_xid
));
922 xs_tcp_check_fraghdr(transport
);
925 static inline void xs_tcp_read_calldir(struct sock_xprt
*transport
,
926 struct xdr_skb_reader
*desc
)
933 * We want transport->tcp_offset to be 8 at the end of this routine
934 * (4 bytes for the xid and 4 bytes for the call/reply flag).
935 * When this function is called for the first time,
936 * transport->tcp_offset is 4 (after having already read the xid).
938 offset
= transport
->tcp_offset
- sizeof(transport
->tcp_xid
);
939 len
= sizeof(transport
->tcp_calldir
) - offset
;
940 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len
);
941 p
= ((char *) &transport
->tcp_calldir
) + offset
;
942 used
= xdr_skb_read_bits(desc
, p
, len
);
943 transport
->tcp_offset
+= used
;
946 transport
->tcp_flags
&= ~TCP_RCV_READ_CALLDIR
;
948 * We don't yet have the XDR buffer, so we will write the calldir
949 * out after we get the buffer from the 'struct rpc_rqst'
951 switch (ntohl(transport
->tcp_calldir
)) {
953 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
954 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
955 transport
->tcp_flags
|= TCP_RPC_REPLY
;
958 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
959 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
960 transport
->tcp_flags
&= ~TCP_RPC_REPLY
;
963 dprintk("RPC: invalid request message type\n");
964 xprt_force_disconnect(&transport
->xprt
);
966 xs_tcp_check_fraghdr(transport
);
969 static inline void xs_tcp_read_common(struct rpc_xprt
*xprt
,
970 struct xdr_skb_reader
*desc
,
971 struct rpc_rqst
*req
)
973 struct sock_xprt
*transport
=
974 container_of(xprt
, struct sock_xprt
, xprt
);
975 struct xdr_buf
*rcvbuf
;
979 rcvbuf
= &req
->rq_private_buf
;
981 if (transport
->tcp_flags
& TCP_RCV_COPY_CALLDIR
) {
983 * Save the RPC direction in the XDR buffer
985 memcpy(rcvbuf
->head
[0].iov_base
+ transport
->tcp_copied
,
986 &transport
->tcp_calldir
,
987 sizeof(transport
->tcp_calldir
));
988 transport
->tcp_copied
+= sizeof(transport
->tcp_calldir
);
989 transport
->tcp_flags
&= ~TCP_RCV_COPY_CALLDIR
;
993 if (len
> transport
->tcp_reclen
- transport
->tcp_offset
) {
994 struct xdr_skb_reader my_desc
;
996 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
997 memcpy(&my_desc
, desc
, sizeof(my_desc
));
999 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1000 &my_desc
, xdr_skb_read_bits
);
1004 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1005 desc
, xdr_skb_read_bits
);
1008 transport
->tcp_copied
+= r
;
1009 transport
->tcp_offset
+= r
;
1012 /* Error when copying to the receive buffer,
1013 * usually because we weren't able to allocate
1014 * additional buffer pages. All we can do now
1015 * is turn off TCP_RCV_COPY_DATA, so the request
1016 * will not receive any additional updates,
1018 * Any remaining data from this record will
1021 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1022 dprintk("RPC: XID %08x truncated request\n",
1023 ntohl(transport
->tcp_xid
));
1024 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1025 "tcp_offset = %u, tcp_reclen = %u\n",
1026 xprt
, transport
->tcp_copied
,
1027 transport
->tcp_offset
, transport
->tcp_reclen
);
1031 dprintk("RPC: XID %08x read %Zd bytes\n",
1032 ntohl(transport
->tcp_xid
), r
);
1033 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1034 "tcp_reclen = %u\n", xprt
, transport
->tcp_copied
,
1035 transport
->tcp_offset
, transport
->tcp_reclen
);
1037 if (transport
->tcp_copied
== req
->rq_private_buf
.buflen
)
1038 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1039 else if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1040 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
)
1041 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1046 * Finds the request corresponding to the RPC xid and invokes the common
1047 * tcp read code to read the data.
1049 static inline int xs_tcp_read_reply(struct rpc_xprt
*xprt
,
1050 struct xdr_skb_reader
*desc
)
1052 struct sock_xprt
*transport
=
1053 container_of(xprt
, struct sock_xprt
, xprt
);
1054 struct rpc_rqst
*req
;
1056 dprintk("RPC: read reply XID %08x\n", ntohl(transport
->tcp_xid
));
1058 /* Find and lock the request corresponding to this xid */
1059 spin_lock(&xprt
->transport_lock
);
1060 req
= xprt_lookup_rqst(xprt
, transport
->tcp_xid
);
1062 dprintk("RPC: XID %08x request not found!\n",
1063 ntohl(transport
->tcp_xid
));
1064 spin_unlock(&xprt
->transport_lock
);
1068 xs_tcp_read_common(xprt
, desc
, req
);
1070 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1071 xprt_complete_rqst(req
->rq_task
, transport
->tcp_copied
);
1073 spin_unlock(&xprt
->transport_lock
);
1077 #if defined(CONFIG_NFS_V4_1)
1079 * Obtains an rpc_rqst previously allocated and invokes the common
1080 * tcp read code to read the data. The result is placed in the callback
1082 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1083 * connection and return -1.
1085 static inline int xs_tcp_read_callback(struct rpc_xprt
*xprt
,
1086 struct xdr_skb_reader
*desc
)
1088 struct sock_xprt
*transport
=
1089 container_of(xprt
, struct sock_xprt
, xprt
);
1090 struct rpc_rqst
*req
;
1092 req
= xprt_alloc_bc_request(xprt
);
1094 printk(KERN_WARNING
"Callback slot table overflowed\n");
1095 xprt_force_disconnect(xprt
);
1099 req
->rq_xid
= transport
->tcp_xid
;
1100 dprintk("RPC: read callback XID %08x\n", ntohl(req
->rq_xid
));
1101 xs_tcp_read_common(xprt
, desc
, req
);
1103 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
)) {
1104 struct svc_serv
*bc_serv
= xprt
->bc_serv
;
1107 * Add callback request to callback list. The callback
1108 * service sleeps on the sv_cb_waitq waiting for new
1109 * requests. Wake it up after adding enqueing the
1112 dprintk("RPC: add callback request to list\n");
1113 spin_lock(&bc_serv
->sv_cb_lock
);
1114 list_add(&req
->rq_bc_list
, &bc_serv
->sv_cb_list
);
1115 spin_unlock(&bc_serv
->sv_cb_lock
);
1116 wake_up(&bc_serv
->sv_cb_waitq
);
1119 req
->rq_private_buf
.len
= transport
->tcp_copied
;
1124 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1125 struct xdr_skb_reader
*desc
)
1127 struct sock_xprt
*transport
=
1128 container_of(xprt
, struct sock_xprt
, xprt
);
1130 return (transport
->tcp_flags
& TCP_RPC_REPLY
) ?
1131 xs_tcp_read_reply(xprt
, desc
) :
1132 xs_tcp_read_callback(xprt
, desc
);
1135 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1136 struct xdr_skb_reader
*desc
)
1138 return xs_tcp_read_reply(xprt
, desc
);
1140 #endif /* CONFIG_NFS_V4_1 */
1143 * Read data off the transport. This can be either an RPC_CALL or an
1144 * RPC_REPLY. Relay the processing to helper functions.
1146 static void xs_tcp_read_data(struct rpc_xprt
*xprt
,
1147 struct xdr_skb_reader
*desc
)
1149 struct sock_xprt
*transport
=
1150 container_of(xprt
, struct sock_xprt
, xprt
);
1152 if (_xs_tcp_read_data(xprt
, desc
) == 0)
1153 xs_tcp_check_fraghdr(transport
);
1156 * The transport_lock protects the request handling.
1157 * There's no need to hold it to update the tcp_flags.
1159 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1163 static inline void xs_tcp_read_discard(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1167 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1168 if (len
> desc
->count
)
1171 desc
->offset
+= len
;
1172 transport
->tcp_offset
+= len
;
1173 dprintk("RPC: discarded %Zu bytes\n", len
);
1174 xs_tcp_check_fraghdr(transport
);
1177 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
1179 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
1180 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1181 struct xdr_skb_reader desc
= {
1187 dprintk("RPC: xs_tcp_data_recv started\n");
1189 /* Read in a new fragment marker if necessary */
1190 /* Can we ever really expect to get completely empty fragments? */
1191 if (transport
->tcp_flags
& TCP_RCV_COPY_FRAGHDR
) {
1192 xs_tcp_read_fraghdr(xprt
, &desc
);
1195 /* Read in the xid if necessary */
1196 if (transport
->tcp_flags
& TCP_RCV_COPY_XID
) {
1197 xs_tcp_read_xid(transport
, &desc
);
1200 /* Read in the call/reply flag */
1201 if (transport
->tcp_flags
& TCP_RCV_READ_CALLDIR
) {
1202 xs_tcp_read_calldir(transport
, &desc
);
1205 /* Read in the request data */
1206 if (transport
->tcp_flags
& TCP_RCV_COPY_DATA
) {
1207 xs_tcp_read_data(xprt
, &desc
);
1210 /* Skip over any trailing bytes on short reads */
1211 xs_tcp_read_discard(transport
, &desc
);
1212 } while (desc
.count
);
1213 dprintk("RPC: xs_tcp_data_recv done\n");
1214 return len
- desc
.count
;
1218 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1219 * @sk: socket with data to read
1220 * @bytes: how much data to read
1223 static void xs_tcp_data_ready(struct sock
*sk
, int bytes
)
1225 struct rpc_xprt
*xprt
;
1226 read_descriptor_t rd_desc
;
1229 dprintk("RPC: xs_tcp_data_ready...\n");
1231 read_lock(&sk
->sk_callback_lock
);
1232 if (!(xprt
= xprt_from_sock(sk
)))
1237 /* Any data means we had a useful conversation, so
1238 * the we don't need to delay the next reconnect
1240 if (xprt
->reestablish_timeout
)
1241 xprt
->reestablish_timeout
= 0;
1243 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1244 rd_desc
.arg
.data
= xprt
;
1246 rd_desc
.count
= 65536;
1247 read
= tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
1250 read_unlock(&sk
->sk_callback_lock
);
1254 * Do the equivalent of linger/linger2 handling for dealing with
1255 * broken servers that don't close the socket in a timely
1258 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt
*xprt
,
1259 unsigned long timeout
)
1261 struct sock_xprt
*transport
;
1263 if (xprt_test_and_set_connecting(xprt
))
1265 set_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1266 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1267 queue_delayed_work(rpciod_workqueue
, &transport
->connect_worker
,
1271 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt
*xprt
)
1273 struct sock_xprt
*transport
;
1275 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1277 if (!test_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
) ||
1278 !cancel_delayed_work(&transport
->connect_worker
))
1280 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1281 xprt_clear_connecting(xprt
);
1284 static void xs_sock_mark_closed(struct rpc_xprt
*xprt
)
1286 smp_mb__before_clear_bit();
1287 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1288 clear_bit(XPRT_CLOSING
, &xprt
->state
);
1289 smp_mb__after_clear_bit();
1290 /* Mark transport as closed and wake up all pending tasks */
1291 xprt_disconnect_done(xprt
);
1295 * xs_tcp_state_change - callback to handle TCP socket state changes
1296 * @sk: socket whose state has changed
1299 static void xs_tcp_state_change(struct sock
*sk
)
1301 struct rpc_xprt
*xprt
;
1303 read_lock(&sk
->sk_callback_lock
);
1304 if (!(xprt
= xprt_from_sock(sk
)))
1306 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
1307 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1308 sk
->sk_state
, xprt_connected(xprt
),
1309 sock_flag(sk
, SOCK_DEAD
),
1310 sock_flag(sk
, SOCK_ZAPPED
),
1313 switch (sk
->sk_state
) {
1314 case TCP_ESTABLISHED
:
1315 spin_lock_bh(&xprt
->transport_lock
);
1316 if (!xprt_test_and_set_connected(xprt
)) {
1317 struct sock_xprt
*transport
= container_of(xprt
,
1318 struct sock_xprt
, xprt
);
1320 /* Reset TCP record info */
1321 transport
->tcp_offset
= 0;
1322 transport
->tcp_reclen
= 0;
1323 transport
->tcp_copied
= 0;
1324 transport
->tcp_flags
=
1325 TCP_RCV_COPY_FRAGHDR
| TCP_RCV_COPY_XID
;
1327 xprt_wake_pending_tasks(xprt
, -EAGAIN
);
1329 spin_unlock_bh(&xprt
->transport_lock
);
1332 /* The client initiated a shutdown of the socket */
1333 xprt
->connect_cookie
++;
1334 xprt
->reestablish_timeout
= 0;
1335 set_bit(XPRT_CLOSING
, &xprt
->state
);
1336 smp_mb__before_clear_bit();
1337 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1338 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1339 smp_mb__after_clear_bit();
1340 xs_tcp_schedule_linger_timeout(xprt
, xs_tcp_fin_timeout
);
1342 case TCP_CLOSE_WAIT
:
1343 /* The server initiated a shutdown of the socket */
1344 xprt_force_disconnect(xprt
);
1346 xprt
->connect_cookie
++;
1349 * If the server closed down the connection, make sure that
1350 * we back off before reconnecting
1352 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
1353 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1356 set_bit(XPRT_CLOSING
, &xprt
->state
);
1357 xs_tcp_schedule_linger_timeout(xprt
, xs_tcp_fin_timeout
);
1358 smp_mb__before_clear_bit();
1359 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1360 smp_mb__after_clear_bit();
1363 xs_tcp_cancel_linger_timeout(xprt
);
1364 xs_sock_mark_closed(xprt
);
1367 read_unlock(&sk
->sk_callback_lock
);
1371 * xs_error_report - callback mainly for catching socket errors
1374 static void xs_error_report(struct sock
*sk
)
1376 struct rpc_xprt
*xprt
;
1378 read_lock(&sk
->sk_callback_lock
);
1379 if (!(xprt
= xprt_from_sock(sk
)))
1381 dprintk("RPC: %s client %p...\n"
1383 __func__
, xprt
, sk
->sk_err
);
1384 xprt_wake_pending_tasks(xprt
, -EAGAIN
);
1386 read_unlock(&sk
->sk_callback_lock
);
1389 static void xs_write_space(struct sock
*sk
)
1391 struct socket
*sock
;
1392 struct rpc_xprt
*xprt
;
1394 if (unlikely(!(sock
= sk
->sk_socket
)))
1396 clear_bit(SOCK_NOSPACE
, &sock
->flags
);
1398 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1400 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
) == 0)
1403 xprt_write_space(xprt
);
1407 * xs_udp_write_space - callback invoked when socket buffer space
1409 * @sk: socket whose state has changed
1411 * Called when more output buffer space is available for this socket.
1412 * We try not to wake our writers until they can make "significant"
1413 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1414 * with a bunch of small requests.
1416 static void xs_udp_write_space(struct sock
*sk
)
1418 read_lock(&sk
->sk_callback_lock
);
1420 /* from net/core/sock.c:sock_def_write_space */
1421 if (sock_writeable(sk
))
1424 read_unlock(&sk
->sk_callback_lock
);
1428 * xs_tcp_write_space - callback invoked when socket buffer space
1430 * @sk: socket whose state has changed
1432 * Called when more output buffer space is available for this socket.
1433 * We try not to wake our writers until they can make "significant"
1434 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1435 * with a bunch of small requests.
1437 static void xs_tcp_write_space(struct sock
*sk
)
1439 read_lock(&sk
->sk_callback_lock
);
1441 /* from net/core/stream.c:sk_stream_write_space */
1442 if (sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
))
1445 read_unlock(&sk
->sk_callback_lock
);
1448 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1450 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1451 struct sock
*sk
= transport
->inet
;
1453 if (transport
->rcvsize
) {
1454 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1455 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1457 if (transport
->sndsize
) {
1458 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1459 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1460 sk
->sk_write_space(sk
);
1465 * xs_udp_set_buffer_size - set send and receive limits
1466 * @xprt: generic transport
1467 * @sndsize: requested size of send buffer, in bytes
1468 * @rcvsize: requested size of receive buffer, in bytes
1470 * Set socket send and receive buffer size limits.
1472 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1474 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1476 transport
->sndsize
= 0;
1478 transport
->sndsize
= sndsize
+ 1024;
1479 transport
->rcvsize
= 0;
1481 transport
->rcvsize
= rcvsize
+ 1024;
1483 xs_udp_do_set_buffer_size(xprt
);
1487 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1488 * @task: task that timed out
1490 * Adjust the congestion window after a retransmit timeout has occurred.
1492 static void xs_udp_timer(struct rpc_task
*task
)
1494 xprt_adjust_cwnd(task
, -ETIMEDOUT
);
1497 static unsigned short xs_get_random_port(void)
1499 unsigned short range
= xprt_max_resvport
- xprt_min_resvport
;
1500 unsigned short rand
= (unsigned short) net_random() % range
;
1501 return rand
+ xprt_min_resvport
;
1505 * xs_set_port - reset the port number in the remote endpoint address
1506 * @xprt: generic transport
1507 * @port: new port number
1510 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1512 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1514 rpc_set_port(xs_addr(xprt
), port
);
1515 xs_update_peer_port(xprt
);
1518 static unsigned short xs_get_srcport(struct sock_xprt
*transport
)
1520 unsigned short port
= transport
->srcport
;
1522 if (port
== 0 && transport
->xprt
.resvport
)
1523 port
= xs_get_random_port();
1527 static unsigned short xs_next_srcport(struct sock_xprt
*transport
, unsigned short port
)
1529 if (transport
->srcport
!= 0)
1530 transport
->srcport
= 0;
1531 if (!transport
->xprt
.resvport
)
1533 if (port
<= xprt_min_resvport
|| port
> xprt_max_resvport
)
1534 return xprt_max_resvport
;
1537 static int xs_bind(struct sock_xprt
*transport
, struct socket
*sock
)
1539 struct sockaddr_storage myaddr
;
1541 unsigned short port
= xs_get_srcport(transport
);
1542 unsigned short last
;
1544 memcpy(&myaddr
, &transport
->srcaddr
, transport
->xprt
.addrlen
);
1546 rpc_set_port((struct sockaddr
*)&myaddr
, port
);
1547 err
= kernel_bind(sock
, (struct sockaddr
*)&myaddr
,
1548 transport
->xprt
.addrlen
);
1552 transport
->srcport
= port
;
1556 port
= xs_next_srcport(transport
, port
);
1559 } while (err
== -EADDRINUSE
&& nloop
!= 2);
1561 if (myaddr
.ss_family
== PF_INET
)
1562 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__
,
1563 &((struct sockaddr_in
*)&myaddr
)->sin_addr
,
1564 port
, err
? "failed" : "ok", err
);
1566 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__
,
1567 &((struct sockaddr_in6
*)&myaddr
)->sin6_addr
,
1568 port
, err
? "failed" : "ok", err
);
1573 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1574 static struct lock_class_key xs_key
[2];
1575 static struct lock_class_key xs_slock_key
[2];
1577 static inline void xs_reclassify_socket4(struct socket
*sock
)
1579 struct sock
*sk
= sock
->sk
;
1581 BUG_ON(sock_owned_by_user(sk
));
1582 sock_lock_init_class_and_name(sk
, "slock-AF_INET-RPC",
1583 &xs_slock_key
[0], "sk_lock-AF_INET-RPC", &xs_key
[0]);
1586 static inline void xs_reclassify_socket6(struct socket
*sock
)
1588 struct sock
*sk
= sock
->sk
;
1590 BUG_ON(sock_owned_by_user(sk
));
1591 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-RPC",
1592 &xs_slock_key
[1], "sk_lock-AF_INET6-RPC", &xs_key
[1]);
1595 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1597 if (family
== PF_INET
)
1598 xs_reclassify_socket4(sock
);
1600 xs_reclassify_socket6(sock
);
1603 static inline void xs_reclassify_socket4(struct socket
*sock
)
1607 static inline void xs_reclassify_socket6(struct socket
*sock
)
1611 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1616 static struct socket
*xs_create_sock(struct rpc_xprt
*xprt
,
1617 struct sock_xprt
*transport
, int family
, int type
, int protocol
)
1619 struct socket
*sock
;
1622 err
= __sock_create(xprt
->xprt_net
, family
, type
, protocol
, &sock
, 1);
1624 dprintk("RPC: can't create %d transport socket (%d).\n",
1628 transport
->srcaddr
.ss_family
= family
;
1629 xs_reclassify_socket(family
, sock
);
1631 if (xs_bind(transport
, sock
)) {
1638 return ERR_PTR(err
);
1641 static struct socket
*xs_create_sock4(struct rpc_xprt
*xprt
,
1642 struct sock_xprt
*transport
, int type
, int protocol
)
1644 return xs_create_sock(xprt
, transport
, PF_INET
, type
, protocol
);
1647 static struct socket
*xs_create_sock6(struct rpc_xprt
*xprt
,
1648 struct sock_xprt
*transport
, int type
, int protocol
)
1650 return xs_create_sock(xprt
, transport
, PF_INET6
, type
, protocol
);
1653 static void xs_udp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
1655 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1657 if (!transport
->inet
) {
1658 struct sock
*sk
= sock
->sk
;
1660 write_lock_bh(&sk
->sk_callback_lock
);
1662 xs_save_old_callbacks(transport
, sk
);
1664 sk
->sk_user_data
= xprt
;
1665 sk
->sk_data_ready
= xs_udp_data_ready
;
1666 sk
->sk_write_space
= xs_udp_write_space
;
1667 sk
->sk_error_report
= xs_error_report
;
1668 sk
->sk_no_check
= UDP_CSUM_NORCV
;
1669 sk
->sk_allocation
= GFP_ATOMIC
;
1671 xprt_set_connected(xprt
);
1673 /* Reset to new socket */
1674 transport
->sock
= sock
;
1675 transport
->inet
= sk
;
1677 write_unlock_bh(&sk
->sk_callback_lock
);
1679 xs_udp_do_set_buffer_size(xprt
);
1682 static void xs_udp_setup_socket(struct sock_xprt
*transport
,
1683 struct socket
*(*create_sock
)(struct rpc_xprt
*,
1684 struct sock_xprt
*, int type
, int protocol
))
1686 struct rpc_xprt
*xprt
= &transport
->xprt
;
1687 struct socket
*sock
= transport
->sock
;
1693 /* Start by resetting any existing state */
1694 xs_reset_transport(transport
);
1695 sock
= create_sock(xprt
, transport
, SOCK_DGRAM
, IPPROTO_UDP
);
1699 dprintk("RPC: worker connecting xprt %p via %s to "
1700 "%s (port %s)\n", xprt
,
1701 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
1702 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
1703 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
1705 xs_udp_finish_connecting(xprt
, sock
);
1708 xprt_clear_connecting(xprt
);
1709 xprt_wake_pending_tasks(xprt
, status
);
1713 * xs_udp_connect_worker4 - set up a UDP socket
1714 * @work: RPC transport to connect
1716 * Invoked by a work queue tasklet.
1719 static void xs_udp_connect_worker4(struct work_struct
*work
)
1721 struct sock_xprt
*transport
=
1722 container_of(work
, struct sock_xprt
, connect_worker
.work
);
1724 xs_udp_setup_socket(transport
, xs_create_sock4
);
1728 * xs_udp_connect_worker6 - set up a UDP socket
1729 * @work: RPC transport to connect
1731 * Invoked by a work queue tasklet.
1734 static void xs_udp_connect_worker6(struct work_struct
*work
)
1736 struct sock_xprt
*transport
=
1737 container_of(work
, struct sock_xprt
, connect_worker
.work
);
1739 xs_udp_setup_socket(transport
, xs_create_sock6
);
1743 * We need to preserve the port number so the reply cache on the server can
1744 * find our cached RPC replies when we get around to reconnecting.
1746 static void xs_abort_connection(struct sock_xprt
*transport
)
1749 struct sockaddr any
;
1751 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport
);
1754 * Disconnect the transport socket by doing a connect operation
1755 * with AF_UNSPEC. This should return immediately...
1757 memset(&any
, 0, sizeof(any
));
1758 any
.sa_family
= AF_UNSPEC
;
1759 result
= kernel_connect(transport
->sock
, &any
, sizeof(any
), 0);
1761 xs_sock_mark_closed(&transport
->xprt
);
1763 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1767 static void xs_tcp_reuse_connection(struct sock_xprt
*transport
)
1769 unsigned int state
= transport
->inet
->sk_state
;
1771 if (state
== TCP_CLOSE
&& transport
->sock
->state
== SS_UNCONNECTED
) {
1772 /* we don't need to abort the connection if the socket
1773 * hasn't undergone a shutdown
1775 if (transport
->inet
->sk_shutdown
== 0)
1777 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
1778 __func__
, transport
->inet
->sk_shutdown
);
1780 if ((1 << state
) & (TCPF_ESTABLISHED
|TCPF_SYN_SENT
)) {
1781 /* we don't need to abort the connection if the socket
1782 * hasn't undergone a shutdown
1784 if (transport
->inet
->sk_shutdown
== 0)
1786 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
1787 "sk_shutdown set to %d\n",
1788 __func__
, transport
->inet
->sk_shutdown
);
1790 xs_abort_connection(transport
);
1793 static int xs_tcp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
1795 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1797 if (!transport
->inet
) {
1798 struct sock
*sk
= sock
->sk
;
1800 write_lock_bh(&sk
->sk_callback_lock
);
1802 xs_save_old_callbacks(transport
, sk
);
1804 sk
->sk_user_data
= xprt
;
1805 sk
->sk_data_ready
= xs_tcp_data_ready
;
1806 sk
->sk_state_change
= xs_tcp_state_change
;
1807 sk
->sk_write_space
= xs_tcp_write_space
;
1808 sk
->sk_error_report
= xs_error_report
;
1809 sk
->sk_allocation
= GFP_ATOMIC
;
1811 /* socket options */
1812 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
1813 sock_reset_flag(sk
, SOCK_LINGER
);
1814 tcp_sk(sk
)->linger2
= 0;
1815 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
1817 xprt_clear_connected(xprt
);
1819 /* Reset to new socket */
1820 transport
->sock
= sock
;
1821 transport
->inet
= sk
;
1823 write_unlock_bh(&sk
->sk_callback_lock
);
1826 if (!xprt_bound(xprt
))
1829 /* Tell the socket layer to start connecting... */
1830 xprt
->stat
.connect_count
++;
1831 xprt
->stat
.connect_start
= jiffies
;
1832 return kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, O_NONBLOCK
);
1836 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
1837 * @xprt: RPC transport to connect
1838 * @transport: socket transport to connect
1839 * @create_sock: function to create a socket of the correct type
1841 * Invoked by a work queue tasklet.
1843 static void xs_tcp_setup_socket(struct sock_xprt
*transport
,
1844 struct socket
*(*create_sock
)(struct rpc_xprt
*,
1845 struct sock_xprt
*, int type
, int protocol
))
1847 struct socket
*sock
= transport
->sock
;
1848 struct rpc_xprt
*xprt
= &transport
->xprt
;
1855 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1856 sock
= create_sock(xprt
, transport
, SOCK_STREAM
, IPPROTO_TCP
);
1858 status
= PTR_ERR(sock
);
1864 abort_and_exit
= test_and_clear_bit(XPRT_CONNECTION_ABORT
,
1866 /* "close" the socket, preserving the local port */
1867 xs_tcp_reuse_connection(transport
);
1873 dprintk("RPC: worker connecting xprt %p via %s to "
1874 "%s (port %s)\n", xprt
,
1875 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
1876 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
1877 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
1879 status
= xs_tcp_finish_connecting(xprt
, sock
);
1880 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1881 xprt
, -status
, xprt_connected(xprt
),
1882 sock
->sk
->sk_state
);
1885 printk("%s: connect returned unhandled error %d\n",
1887 case -EADDRNOTAVAIL
:
1888 /* We're probably in TIME_WAIT. Get rid of existing socket,
1891 set_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
);
1892 xprt_force_disconnect(xprt
);
1897 /* retry with existing socket, after a delay */
1901 xprt_clear_connecting(xprt
);
1904 /* Happens, for instance, if the user specified a link
1905 * local IPv6 address without a scope-id.
1912 xprt_clear_connecting(xprt
);
1913 xprt_wake_pending_tasks(xprt
, status
);
1917 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1918 * @work: RPC transport to connect
1920 * Invoked by a work queue tasklet.
1922 static void xs_tcp_connect_worker4(struct work_struct
*work
)
1924 struct sock_xprt
*transport
=
1925 container_of(work
, struct sock_xprt
, connect_worker
.work
);
1927 xs_tcp_setup_socket(transport
, xs_create_sock4
);
1931 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1932 * @work: RPC transport to connect
1934 * Invoked by a work queue tasklet.
1936 static void xs_tcp_connect_worker6(struct work_struct
*work
)
1938 struct sock_xprt
*transport
=
1939 container_of(work
, struct sock_xprt
, connect_worker
.work
);
1941 xs_tcp_setup_socket(transport
, xs_create_sock6
);
1945 * xs_connect - connect a socket to a remote endpoint
1946 * @task: address of RPC task that manages state of connect request
1948 * TCP: If the remote end dropped the connection, delay reconnecting.
1950 * UDP socket connects are synchronous, but we use a work queue anyway
1951 * to guarantee that even unprivileged user processes can set up a
1952 * socket on a privileged port.
1954 * If a UDP socket connect fails, the delay behavior here prevents
1955 * retry floods (hard mounts).
1957 static void xs_connect(struct rpc_task
*task
)
1959 struct rpc_xprt
*xprt
= task
->tk_xprt
;
1960 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1962 if (transport
->sock
!= NULL
&& !RPC_IS_SOFTCONN(task
)) {
1963 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1965 xprt
, xprt
->reestablish_timeout
/ HZ
);
1966 queue_delayed_work(rpciod_workqueue
,
1967 &transport
->connect_worker
,
1968 xprt
->reestablish_timeout
);
1969 xprt
->reestablish_timeout
<<= 1;
1970 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
1971 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1972 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
1973 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
1975 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
1976 queue_delayed_work(rpciod_workqueue
,
1977 &transport
->connect_worker
, 0);
1982 * xs_udp_print_stats - display UDP socket-specifc stats
1983 * @xprt: rpc_xprt struct containing statistics
1987 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
1989 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1991 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1993 xprt
->stat
.bind_count
,
1996 xprt
->stat
.bad_xids
,
1998 xprt
->stat
.bklog_u
);
2002 * xs_tcp_print_stats - display TCP socket-specifc stats
2003 * @xprt: rpc_xprt struct containing statistics
2007 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2009 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2012 if (xprt_connected(xprt
))
2013 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2015 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
2017 xprt
->stat
.bind_count
,
2018 xprt
->stat
.connect_count
,
2019 xprt
->stat
.connect_time
,
2023 xprt
->stat
.bad_xids
,
2025 xprt
->stat
.bklog_u
);
2029 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2030 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2031 * to use the server side send routines.
2033 static void *bc_malloc(struct rpc_task
*task
, size_t size
)
2036 struct rpc_buffer
*buf
;
2038 BUG_ON(size
> PAGE_SIZE
- sizeof(struct rpc_buffer
));
2039 page
= alloc_page(GFP_KERNEL
);
2044 buf
= page_address(page
);
2045 buf
->len
= PAGE_SIZE
;
2051 * Free the space allocated in the bc_alloc routine
2053 static void bc_free(void *buffer
)
2055 struct rpc_buffer
*buf
;
2060 buf
= container_of(buffer
, struct rpc_buffer
, data
);
2061 free_page((unsigned long)buf
);
2065 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2066 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2068 static int bc_sendto(struct rpc_rqst
*req
)
2071 struct xdr_buf
*xbufp
= &req
->rq_snd_buf
;
2072 struct rpc_xprt
*xprt
= req
->rq_xprt
;
2073 struct sock_xprt
*transport
=
2074 container_of(xprt
, struct sock_xprt
, xprt
);
2075 struct socket
*sock
= transport
->sock
;
2076 unsigned long headoff
;
2077 unsigned long tailoff
;
2080 * Set up the rpc header and record marker stuff
2082 xs_encode_tcp_record_marker(xbufp
);
2084 tailoff
= (unsigned long)xbufp
->tail
[0].iov_base
& ~PAGE_MASK
;
2085 headoff
= (unsigned long)xbufp
->head
[0].iov_base
& ~PAGE_MASK
;
2086 len
= svc_send_common(sock
, xbufp
,
2087 virt_to_page(xbufp
->head
[0].iov_base
), headoff
,
2088 xbufp
->tail
[0].iov_base
, tailoff
);
2090 if (len
!= xbufp
->len
) {
2091 printk(KERN_NOTICE
"Error sending entire callback!\n");
2099 * The send routine. Borrows from svc_send
2101 static int bc_send_request(struct rpc_task
*task
)
2103 struct rpc_rqst
*req
= task
->tk_rqstp
;
2104 struct svc_xprt
*xprt
;
2105 struct svc_sock
*svsk
;
2108 dprintk("sending request with xid: %08x\n", ntohl(req
->rq_xid
));
2110 * Get the server socket associated with this callback xprt
2112 xprt
= req
->rq_xprt
->bc_xprt
;
2113 svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
2116 * Grab the mutex to serialize data as the connection is shared
2117 * with the fore channel
2119 if (!mutex_trylock(&xprt
->xpt_mutex
)) {
2120 rpc_sleep_on(&xprt
->xpt_bc_pending
, task
, NULL
);
2121 if (!mutex_trylock(&xprt
->xpt_mutex
))
2123 rpc_wake_up_queued_task(&xprt
->xpt_bc_pending
, task
);
2125 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
))
2128 len
= bc_sendto(req
);
2129 mutex_unlock(&xprt
->xpt_mutex
);
2138 * The close routine. Since this is client initiated, we do nothing
2141 static void bc_close(struct rpc_xprt
*xprt
)
2146 * The xprt destroy routine. Again, because this connection is client
2147 * initiated, we do nothing
2150 static void bc_destroy(struct rpc_xprt
*xprt
)
2154 static struct rpc_xprt_ops xs_udp_ops
= {
2155 .set_buffer_size
= xs_udp_set_buffer_size
,
2156 .reserve_xprt
= xprt_reserve_xprt_cong
,
2157 .release_xprt
= xprt_release_xprt_cong
,
2158 .rpcbind
= rpcb_getport_async
,
2159 .set_port
= xs_set_port
,
2160 .connect
= xs_connect
,
2161 .buf_alloc
= rpc_malloc
,
2162 .buf_free
= rpc_free
,
2163 .send_request
= xs_udp_send_request
,
2164 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
2165 .timer
= xs_udp_timer
,
2166 .release_request
= xprt_release_rqst_cong
,
2168 .destroy
= xs_destroy
,
2169 .print_stats
= xs_udp_print_stats
,
2172 static struct rpc_xprt_ops xs_tcp_ops
= {
2173 .reserve_xprt
= xprt_reserve_xprt
,
2174 .release_xprt
= xs_tcp_release_xprt
,
2175 .rpcbind
= rpcb_getport_async
,
2176 .set_port
= xs_set_port
,
2177 .connect
= xs_connect
,
2178 .buf_alloc
= rpc_malloc
,
2179 .buf_free
= rpc_free
,
2180 .send_request
= xs_tcp_send_request
,
2181 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2182 .close
= xs_tcp_close
,
2183 .destroy
= xs_destroy
,
2184 .print_stats
= xs_tcp_print_stats
,
2188 * The rpc_xprt_ops for the server backchannel
2191 static struct rpc_xprt_ops bc_tcp_ops
= {
2192 .reserve_xprt
= xprt_reserve_xprt
,
2193 .release_xprt
= xprt_release_xprt
,
2194 .buf_alloc
= bc_malloc
,
2195 .buf_free
= bc_free
,
2196 .send_request
= bc_send_request
,
2197 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2199 .destroy
= bc_destroy
,
2200 .print_stats
= xs_tcp_print_stats
,
2203 static struct rpc_xprt
*xs_setup_xprt(struct xprt_create
*args
,
2204 unsigned int slot_table_size
)
2206 struct rpc_xprt
*xprt
;
2207 struct sock_xprt
*new;
2209 if (args
->addrlen
> sizeof(xprt
->addr
)) {
2210 dprintk("RPC: xs_setup_xprt: address too large\n");
2211 return ERR_PTR(-EBADF
);
2214 xprt
= xprt_alloc(args
->net
, sizeof(*new), slot_table_size
);
2216 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2218 return ERR_PTR(-ENOMEM
);
2221 new = container_of(xprt
, struct sock_xprt
, xprt
);
2222 memcpy(&xprt
->addr
, args
->dstaddr
, args
->addrlen
);
2223 xprt
->addrlen
= args
->addrlen
;
2225 memcpy(&new->srcaddr
, args
->srcaddr
, args
->addrlen
);
2230 static const struct rpc_timeout xs_udp_default_timeout
= {
2231 .to_initval
= 5 * HZ
,
2232 .to_maxval
= 30 * HZ
,
2233 .to_increment
= 5 * HZ
,
2238 * xs_setup_udp - Set up transport to use a UDP socket
2239 * @args: rpc transport creation arguments
2242 static struct rpc_xprt
*xs_setup_udp(struct xprt_create
*args
)
2244 struct sockaddr
*addr
= args
->dstaddr
;
2245 struct rpc_xprt
*xprt
;
2246 struct sock_xprt
*transport
;
2247 struct rpc_xprt
*ret
;
2249 xprt
= xs_setup_xprt(args
, xprt_udp_slot_table_entries
);
2252 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2254 xprt
->prot
= IPPROTO_UDP
;
2256 /* XXX: header size can vary due to auth type, IPv6, etc. */
2257 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
2259 xprt
->bind_timeout
= XS_BIND_TO
;
2260 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
2261 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2263 xprt
->ops
= &xs_udp_ops
;
2265 xprt
->timeout
= &xs_udp_default_timeout
;
2267 switch (addr
->sa_family
) {
2269 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2270 xprt_set_bound(xprt
);
2272 INIT_DELAYED_WORK(&transport
->connect_worker
,
2273 xs_udp_connect_worker4
);
2274 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP
);
2277 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2278 xprt_set_bound(xprt
);
2280 INIT_DELAYED_WORK(&transport
->connect_worker
,
2281 xs_udp_connect_worker6
);
2282 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP6
);
2285 ret
= ERR_PTR(-EAFNOSUPPORT
);
2289 if (xprt_bound(xprt
))
2290 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2291 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2292 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2293 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2295 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2296 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2297 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2299 if (try_module_get(THIS_MODULE
))
2301 ret
= ERR_PTR(-EINVAL
);
2307 static const struct rpc_timeout xs_tcp_default_timeout
= {
2308 .to_initval
= 60 * HZ
,
2309 .to_maxval
= 60 * HZ
,
2314 * xs_setup_tcp - Set up transport to use a TCP socket
2315 * @args: rpc transport creation arguments
2318 static struct rpc_xprt
*xs_setup_tcp(struct xprt_create
*args
)
2320 struct sockaddr
*addr
= args
->dstaddr
;
2321 struct rpc_xprt
*xprt
;
2322 struct sock_xprt
*transport
;
2323 struct rpc_xprt
*ret
;
2325 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
);
2328 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2330 xprt
->prot
= IPPROTO_TCP
;
2331 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2332 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2334 xprt
->bind_timeout
= XS_BIND_TO
;
2335 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2336 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2338 xprt
->ops
= &xs_tcp_ops
;
2339 xprt
->timeout
= &xs_tcp_default_timeout
;
2341 switch (addr
->sa_family
) {
2343 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2344 xprt_set_bound(xprt
);
2346 INIT_DELAYED_WORK(&transport
->connect_worker
,
2347 xs_tcp_connect_worker4
);
2348 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP
);
2351 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2352 xprt_set_bound(xprt
);
2354 INIT_DELAYED_WORK(&transport
->connect_worker
,
2355 xs_tcp_connect_worker6
);
2356 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP6
);
2359 ret
= ERR_PTR(-EAFNOSUPPORT
);
2363 if (xprt_bound(xprt
))
2364 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2365 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2366 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2367 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2369 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2370 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2371 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2374 if (try_module_get(THIS_MODULE
))
2376 ret
= ERR_PTR(-EINVAL
);
2383 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2384 * @args: rpc transport creation arguments
2387 static struct rpc_xprt
*xs_setup_bc_tcp(struct xprt_create
*args
)
2389 struct sockaddr
*addr
= args
->dstaddr
;
2390 struct rpc_xprt
*xprt
;
2391 struct sock_xprt
*transport
;
2392 struct svc_sock
*bc_sock
;
2393 struct rpc_xprt
*ret
;
2395 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
);
2398 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2400 xprt
->prot
= IPPROTO_TCP
;
2401 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2402 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2403 xprt
->timeout
= &xs_tcp_default_timeout
;
2406 xprt_set_bound(xprt
);
2407 xprt
->bind_timeout
= 0;
2408 xprt
->reestablish_timeout
= 0;
2409 xprt
->idle_timeout
= 0;
2412 * The backchannel uses the same socket connection as the
2415 xprt
->bc_xprt
= args
->bc_xprt
;
2416 bc_sock
= container_of(args
->bc_xprt
, struct svc_sock
, sk_xprt
);
2417 bc_sock
->sk_bc_xprt
= xprt
;
2418 transport
->sock
= bc_sock
->sk_sock
;
2419 transport
->inet
= bc_sock
->sk_sk
;
2421 xprt
->ops
= &bc_tcp_ops
;
2423 switch (addr
->sa_family
) {
2425 xs_format_peer_addresses(xprt
, "tcp",
2429 xs_format_peer_addresses(xprt
, "tcp",
2430 RPCBIND_NETID_TCP6
);
2433 ret
= ERR_PTR(-EAFNOSUPPORT
);
2437 if (xprt_bound(xprt
))
2438 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2439 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2440 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2441 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2443 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2444 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2445 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2448 * Since we don't want connections for the backchannel, we set
2449 * the xprt status to connected
2451 xprt_set_connected(xprt
);
2454 if (try_module_get(THIS_MODULE
))
2456 ret
= ERR_PTR(-EINVAL
);
2462 static struct xprt_class xs_udp_transport
= {
2463 .list
= LIST_HEAD_INIT(xs_udp_transport
.list
),
2465 .owner
= THIS_MODULE
,
2466 .ident
= XPRT_TRANSPORT_UDP
,
2467 .setup
= xs_setup_udp
,
2470 static struct xprt_class xs_tcp_transport
= {
2471 .list
= LIST_HEAD_INIT(xs_tcp_transport
.list
),
2473 .owner
= THIS_MODULE
,
2474 .ident
= XPRT_TRANSPORT_TCP
,
2475 .setup
= xs_setup_tcp
,
2478 static struct xprt_class xs_bc_tcp_transport
= {
2479 .list
= LIST_HEAD_INIT(xs_bc_tcp_transport
.list
),
2480 .name
= "tcp NFSv4.1 backchannel",
2481 .owner
= THIS_MODULE
,
2482 .ident
= XPRT_TRANSPORT_BC_TCP
,
2483 .setup
= xs_setup_bc_tcp
,
2487 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2490 int init_socket_xprt(void)
2493 if (!sunrpc_table_header
)
2494 sunrpc_table_header
= register_sysctl_table(sunrpc_table
);
2497 xprt_register_transport(&xs_udp_transport
);
2498 xprt_register_transport(&xs_tcp_transport
);
2499 xprt_register_transport(&xs_bc_tcp_transport
);
2505 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2508 void cleanup_socket_xprt(void)
2511 if (sunrpc_table_header
) {
2512 unregister_sysctl_table(sunrpc_table_header
);
2513 sunrpc_table_header
= NULL
;
2517 xprt_unregister_transport(&xs_udp_transport
);
2518 xprt_unregister_transport(&xs_tcp_transport
);
2519 xprt_unregister_transport(&xs_bc_tcp_transport
);
2522 static int param_set_uint_minmax(const char *val
,
2523 const struct kernel_param
*kp
,
2524 unsigned int min
, unsigned int max
)
2531 ret
= strict_strtoul(val
, 0, &num
);
2532 if (ret
== -EINVAL
|| num
< min
|| num
> max
)
2534 *((unsigned int *)kp
->arg
) = num
;
2538 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
2540 return param_set_uint_minmax(val
, kp
,
2545 static struct kernel_param_ops param_ops_portnr
= {
2546 .set
= param_set_portnr
,
2547 .get
= param_get_uint
,
2550 #define param_check_portnr(name, p) \
2551 __param_check(name, p, unsigned int);
2553 module_param_named(min_resvport
, xprt_min_resvport
, portnr
, 0644);
2554 module_param_named(max_resvport
, xprt_max_resvport
, portnr
, 0644);
2556 static int param_set_slot_table_size(const char *val
,
2557 const struct kernel_param
*kp
)
2559 return param_set_uint_minmax(val
, kp
,
2561 RPC_MAX_SLOT_TABLE
);
2564 static struct kernel_param_ops param_ops_slot_table_size
= {
2565 .set
= param_set_slot_table_size
,
2566 .get
= param_get_uint
,
2569 #define param_check_slot_table_size(name, p) \
2570 __param_check(name, p, unsigned int);
2572 module_param_named(tcp_slot_table_entries
, xprt_tcp_slot_table_entries
,
2573 slot_table_size
, 0644);
2574 module_param_named(udp_slot_table_entries
, xprt_udp_slot_table_entries
,
2575 slot_table_size
, 0644);