blob: 7762b9f8a8b72581f00003ad266ab060754f43b9 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/net/sunrpc/svcsock.c
3 *
4 * These are the RPC server socket internals.
5 *
6 * The server scheduling algorithm does not always distribute the load
7 * evenly when servicing a single client. May need to modify the
Tom Tuckerf6150c32007-12-30 21:07:57 -06008 * svc_xprt_enqueue procedure...
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 *
10 * TCP support is largely untested and may be a little slow. The problem
11 * is that we currently do two separate recvfrom's, one for the 4-byte
12 * record length, and the second for the actual record. This could possibly
13 * be improved by always reading a minimum size of around 100 bytes and
14 * tucking any superfluous bytes away in a temporary store. Still, that
15 * leaves write requests out in the rain. An alternative may be to peek at
16 * the first skb in the queue, and if it matches the next TCP sequence
17 * number, to extract the record marker. Yuck.
18 *
19 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
20 */
21
Ilpo Järvinen172589c2007-08-28 15:50:33 -070022#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/sched.h>
Paul Gortmaker3a9a2312011-05-27 09:12:25 -040024#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/errno.h>
26#include <linux/fcntl.h>
27#include <linux/net.h>
28#include <linux/in.h>
29#include <linux/inet.h>
30#include <linux/udp.h>
Andrew Morton91483c42005-08-09 20:20:07 -070031#include <linux/tcp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/unistd.h>
33#include <linux/slab.h>
34#include <linux/netdevice.h>
35#include <linux/skbuff.h>
NeilBrownb41b66d2006-10-02 02:17:48 -070036#include <linux/file.h>
Nigel Cunningham7dfb7102006-12-06 20:34:23 -080037#include <linux/freezer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <net/sock.h>
39#include <net/checksum.h>
40#include <net/ip.h>
Chuck Leverb92503b2007-02-12 00:53:36 -080041#include <net/ipv6.h>
Chuck Leverb7872fe2008-04-14 12:27:01 -040042#include <net/tcp.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070043#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <asm/uaccess.h>
45#include <asm/ioctls.h>
Eric Dumazet22911fc2012-06-27 00:23:44 +000046#include <trace/events/skb.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#include <linux/sunrpc/types.h>
Chuck Leverad06e4b2007-02-12 00:53:32 -080049#include <linux/sunrpc/clnt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/sunrpc/xdr.h>
Chuck Leverc0401ea2008-04-14 12:27:30 -040051#include <linux/sunrpc/msg_prot.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <linux/sunrpc/svcsock.h>
53#include <linux/sunrpc/stats.h>
Rahul Iyer4cfc7e62009-09-10 17:32:28 +030054#include <linux/sunrpc/xprt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
H Hartley Sweeten177e4f92011-06-20 17:54:51 -070056#include "sunrpc.h"
57
Tom Tucker360d87382007-12-30 21:07:17 -060058#define RPCDBG_FACILITY RPCDBG_SVCXPRT
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60
61static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
J. Bruce Fields72c35372012-08-13 17:46:17 -040062 int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063static void svc_udp_data_ready(struct sock *, int);
64static int svc_udp_recvfrom(struct svc_rqst *);
65static int svc_udp_sendto(struct svc_rqst *);
Tom Tucker755ccea2007-12-30 21:07:27 -060066static void svc_sock_detach(struct svc_xprt *);
Trond Myklebust69b6ba32008-12-23 16:30:11 -050067static void svc_tcp_sock_detach(struct svc_xprt *);
Tom Tucker755ccea2007-12-30 21:07:27 -060068static void svc_sock_free(struct svc_xprt *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Tom Tuckerb700cbb2007-12-30 21:07:42 -060070static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
Pavel Emelyanov62832c02010-09-29 16:04:18 +040071 struct net *, struct sockaddr *,
72 int, int);
Trond Myklebust9e00abc2011-07-13 19:20:49 -040073#if defined(CONFIG_SUNRPC_BACKCHANNEL)
Andy Adamson1f11a032011-01-06 02:04:26 +000074static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
75 struct net *, struct sockaddr *,
76 int, int);
77static void svc_bc_sock_free(struct svc_xprt *xprt);
Trond Myklebust9e00abc2011-07-13 19:20:49 -040078#endif /* CONFIG_SUNRPC_BACKCHANNEL */
Andy Adamson1f11a032011-01-06 02:04:26 +000079
Peter Zijlstraed075362006-12-06 20:35:24 -080080#ifdef CONFIG_DEBUG_LOCK_ALLOC
81static struct lock_class_key svc_key[2];
82static struct lock_class_key svc_slock_key[2];
83
Tom Tucker0f0257e2007-12-30 21:08:27 -060084static void svc_reclassify_socket(struct socket *sock)
Peter Zijlstraed075362006-12-06 20:35:24 -080085{
86 struct sock *sk = sock->sk;
Weston Andros Adamson1b7a1812012-10-23 10:43:39 -040087
88 WARN_ON_ONCE(sock_owned_by_user(sk));
89 if (sock_owned_by_user(sk))
90 return;
91
Peter Zijlstraed075362006-12-06 20:35:24 -080092 switch (sk->sk_family) {
93 case AF_INET:
94 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
Tom Tuckerdef13d72007-12-30 21:08:08 -060095 &svc_slock_key[0],
96 "sk_xprt.xpt_lock-AF_INET-NFSD",
97 &svc_key[0]);
Peter Zijlstraed075362006-12-06 20:35:24 -080098 break;
99
100 case AF_INET6:
101 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
Tom Tuckerdef13d72007-12-30 21:08:08 -0600102 &svc_slock_key[1],
103 "sk_xprt.xpt_lock-AF_INET6-NFSD",
104 &svc_key[1]);
Peter Zijlstraed075362006-12-06 20:35:24 -0800105 break;
106
107 default:
108 BUG();
109 }
110}
111#else
Tom Tucker0f0257e2007-12-30 21:08:27 -0600112static void svc_reclassify_socket(struct socket *sock)
Peter Zijlstraed075362006-12-06 20:35:24 -0800113{
114}
115#endif
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117/*
118 * Release an skbuff after use
119 */
Tom Tucker5148bf42007-12-30 21:07:25 -0600120static void svc_release_skb(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121{
Tom Tucker5148bf42007-12-30 21:07:25 -0600122 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124 if (skb) {
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600125 struct svc_sock *svsk =
126 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Tom Tucker5148bf42007-12-30 21:07:25 -0600127 rqstp->rq_xprt_ctxt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
Eric Dumazet9d410c72009-10-30 05:03:53 +0000130 skb_free_datagram_locked(svsk->sk_sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132}
133
Chuck Leverb92503b2007-02-12 00:53:36 -0800134union svc_pktinfo_u {
135 struct in_pktinfo pkti;
Chuck Leverb92503b2007-02-12 00:53:36 -0800136 struct in6_pktinfo pkti6;
Chuck Leverb92503b2007-02-12 00:53:36 -0800137};
David S. Millerbc375ea2007-04-12 13:35:59 -0700138#define SVC_PKTINFO_SPACE \
139 CMSG_SPACE(sizeof(union svc_pktinfo_u))
Chuck Leverb92503b2007-02-12 00:53:36 -0800140
141static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
142{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600143 struct svc_sock *svsk =
144 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
145 switch (svsk->sk_sk->sk_family) {
Chuck Leverb92503b2007-02-12 00:53:36 -0800146 case AF_INET: {
147 struct in_pktinfo *pki = CMSG_DATA(cmh);
148
149 cmh->cmsg_level = SOL_IP;
150 cmh->cmsg_type = IP_PKTINFO;
151 pki->ipi_ifindex = 0;
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800152 pki->ipi_spec_dst.s_addr =
153 svc_daddr_in(rqstp)->sin_addr.s_addr;
Chuck Leverb92503b2007-02-12 00:53:36 -0800154 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
155 }
156 break;
NeilBrown5a05ed72007-03-06 01:42:22 -0800157
Chuck Leverb92503b2007-02-12 00:53:36 -0800158 case AF_INET6: {
159 struct in6_pktinfo *pki = CMSG_DATA(cmh);
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800160 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
Chuck Leverb92503b2007-02-12 00:53:36 -0800161
162 cmh->cmsg_level = SOL_IPV6;
163 cmh->cmsg_type = IPV6_PKTINFO;
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800164 pki->ipi6_ifindex = daddr->sin6_scope_id;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000165 pki->ipi6_addr = daddr->sin6_addr;
Chuck Leverb92503b2007-02-12 00:53:36 -0800166 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
167 }
168 break;
Chuck Leverb92503b2007-02-12 00:53:36 -0800169 }
Chuck Leverb92503b2007-02-12 00:53:36 -0800170}
171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172/*
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300173 * send routine intended to be shared by the fore- and back-channel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 */
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300175int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
176 struct page *headpage, unsigned long headoffset,
177 struct page *tailpage, unsigned long tailoffset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 int result;
180 int size;
181 struct page **ppage = xdr->pages;
182 size_t base = xdr->page_base;
183 unsigned int pglen = xdr->page_len;
184 unsigned int flags = MSG_MORE;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300185 int slen;
186 int len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
188 slen = xdr->len;
189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 /* send head */
191 if (slen == xdr->head[0].iov_len)
192 flags = 0;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300193 len = kernel_sendpage(sock, headpage, headoffset,
NeilBrown44524352006-10-04 02:15:46 -0700194 xdr->head[0].iov_len, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 if (len != xdr->head[0].iov_len)
196 goto out;
197 slen -= xdr->head[0].iov_len;
198 if (slen == 0)
199 goto out;
200
201 /* send page data */
202 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
203 while (pglen > 0) {
204 if (slen == size)
205 flags = 0;
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700206 result = kernel_sendpage(sock, *ppage, base, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 if (result > 0)
208 len += result;
209 if (result != size)
210 goto out;
211 slen -= size;
212 pglen -= size;
213 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
214 base = 0;
215 ppage++;
216 }
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 /* send tail */
219 if (xdr->tail[0].iov_len) {
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300220 result = kernel_sendpage(sock, tailpage, tailoffset,
221 xdr->tail[0].iov_len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 if (result > 0)
223 len += result;
224 }
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300225
226out:
227 return len;
228}
229
230
231/*
232 * Generic sendto routine
233 */
234static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
235{
236 struct svc_sock *svsk =
237 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
238 struct socket *sock = svsk->sk_sock;
239 union {
240 struct cmsghdr hdr;
241 long all[SVC_PKTINFO_SPACE / sizeof(long)];
242 } buffer;
243 struct cmsghdr *cmh = &buffer.hdr;
244 int len = 0;
245 unsigned long tailoff;
246 unsigned long headoff;
247 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
248
249 if (rqstp->rq_prot == IPPROTO_UDP) {
250 struct msghdr msg = {
251 .msg_name = &rqstp->rq_addr,
252 .msg_namelen = rqstp->rq_addrlen,
253 .msg_control = cmh,
254 .msg_controllen = sizeof(buffer),
255 .msg_flags = MSG_MORE,
256 };
257
258 svc_set_cmsg_data(rqstp, cmh);
259
260 if (sock_sendmsg(sock, &msg, 0) < 0)
261 goto out;
262 }
263
264 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
265 headoff = 0;
266 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
267 rqstp->rq_respages[0], tailoff);
268
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269out:
Chuck Leverad06e4b2007-02-12 00:53:32 -0800270 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600271 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
Chuck Leverad06e4b2007-02-12 00:53:32 -0800272 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274 return len;
275}
276
277/*
NeilBrown80212d52006-10-02 02:17:47 -0700278 * Report socket names for nfsdfs
279 */
Chuck Levere7942b92009-04-23 19:32:48 -0400280static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
NeilBrown80212d52006-10-02 02:17:47 -0700281{
Chuck Lever017cb472009-04-23 19:33:03 -0400282 const struct sock *sk = svsk->sk_sk;
283 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
284 "udp" : "tcp";
NeilBrown80212d52006-10-02 02:17:47 -0700285 int len;
286
Chuck Lever017cb472009-04-23 19:33:03 -0400287 switch (sk->sk_family) {
Chuck Levere7942b92009-04-23 19:32:48 -0400288 case PF_INET:
289 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
Chuck Lever017cb472009-04-23 19:33:03 -0400290 proto_name,
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000291 &inet_sk(sk)->inet_rcv_saddr,
292 inet_sk(sk)->inet_num);
NeilBrown80212d52006-10-02 02:17:47 -0700293 break;
Chuck Lever58de2f82009-04-23 19:32:55 -0400294 case PF_INET6:
295 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
Chuck Lever017cb472009-04-23 19:33:03 -0400296 proto_name,
297 &inet6_sk(sk)->rcv_saddr,
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000298 inet_sk(sk)->inet_num);
NeilBrown80212d52006-10-02 02:17:47 -0700299 break;
300 default:
Chuck Levere7942b92009-04-23 19:32:48 -0400301 len = snprintf(buf, remaining, "*unknown-%d*\n",
Chuck Lever017cb472009-04-23 19:33:03 -0400302 sk->sk_family);
NeilBrown80212d52006-10-02 02:17:47 -0700303 }
Chuck Levere7942b92009-04-23 19:32:48 -0400304
305 if (len >= remaining) {
306 *buf = '\0';
307 return -ENAMETOOLONG;
NeilBrown80212d52006-10-02 02:17:47 -0700308 }
309 return len;
310}
311
NeilBrown80212d52006-10-02 02:17:47 -0700312/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 * Check input queue length
314 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600315static int svc_recv_available(struct svc_sock *svsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 struct socket *sock = svsk->sk_sock;
318 int avail, err;
319
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700320 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
322 return (err >= 0)? avail : err;
323}
324
325/*
326 * Generic recvfrom routine.
327 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600328static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
329 int buflen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600331 struct svc_sock *svsk =
332 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Chuck Lever1ba95102007-02-12 00:53:31 -0800333 struct msghdr msg = {
334 .msg_flags = MSG_DONTWAIT,
335 };
336 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
Tom Tucker260c1d12007-12-30 21:08:29 -0600338 rqstp->rq_xprt_hlen = 0;
339
Chuck Lever1ba95102007-02-12 00:53:31 -0800340 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
341 msg.msg_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
Chuck Lever1ba95102007-02-12 00:53:31 -0800344 svsk, iov[0].iov_base, iov[0].iov_len, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 return len;
346}
347
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800348static int svc_partial_recvfrom(struct svc_rqst *rqstp,
349 struct kvec *iov, int nr,
350 int buflen, unsigned int base)
351{
352 size_t save_iovlen;
Trond Myklebust09acfea2012-03-11 15:22:54 -0400353 void *save_iovbase;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800354 unsigned int i;
355 int ret;
356
357 if (base == 0)
358 return svc_recvfrom(rqstp, iov, nr, buflen);
359
360 for (i = 0; i < nr; i++) {
361 if (iov[i].iov_len > base)
362 break;
363 base -= iov[i].iov_len;
364 }
365 save_iovlen = iov[i].iov_len;
366 save_iovbase = iov[i].iov_base;
367 iov[i].iov_len -= base;
368 iov[i].iov_base += base;
369 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
370 iov[i].iov_len = save_iovlen;
371 iov[i].iov_base = save_iovbase;
372 return ret;
373}
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375/*
376 * Set socket snd and rcv buffer lengths
377 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600378static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
379 unsigned int rcv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380{
381#if 0
382 mm_segment_t oldfs;
383 oldfs = get_fs(); set_fs(KERNEL_DS);
384 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
385 (char*)&snd, sizeof(snd));
386 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
387 (char*)&rcv, sizeof(rcv));
388#else
389 /* sock_setsockopt limits use to sysctl_?mem_max,
390 * which isn't acceptable. Until that is made conditional
391 * on not having CAP_SYS_RESOURCE or similar, we go direct...
392 * DaveM said I could!
393 */
394 lock_sock(sock->sk);
395 sock->sk->sk_sndbuf = snd * 2;
396 sock->sk->sk_rcvbuf = rcv * 2;
Trond Myklebust47fcb032009-05-18 17:47:56 -0400397 sock->sk->sk_write_space(sock->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 release_sock(sock->sk);
399#endif
400}
401/*
402 * INET callback when data has been received on the socket.
403 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600404static void svc_udp_data_ready(struct sock *sk, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405{
Neil Brown939bb7e2005-09-13 01:25:39 -0700406 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000407 wait_queue_head_t *wq = sk_sleep(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
Neil Brown939bb7e2005-09-13 01:25:39 -0700409 if (svsk) {
410 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
Tom Tucker02fc6c32007-12-30 21:07:48 -0600411 svsk, sk, count,
412 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
413 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600414 svc_xprt_enqueue(&svsk->sk_xprt);
Neil Brown939bb7e2005-09-13 01:25:39 -0700415 }
Eric Dumazeteaefd112011-02-18 03:26:36 +0000416 if (wq && waitqueue_active(wq))
417 wake_up_interruptible(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418}
419
420/*
421 * INET callback when space is newly available on the socket.
422 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600423static void svc_write_space(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424{
425 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
Eric Dumazeteaefd112011-02-18 03:26:36 +0000426 wait_queue_head_t *wq = sk_sleep(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
428 if (svsk) {
429 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
Tom Tucker02fc6c32007-12-30 21:07:48 -0600430 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
Tom Tuckerf6150c32007-12-30 21:07:57 -0600431 svc_xprt_enqueue(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 }
433
Eric Dumazeteaefd112011-02-18 03:26:36 +0000434 if (wq && waitqueue_active(wq)) {
Neil Brown939bb7e2005-09-13 01:25:39 -0700435 dprintk("RPC svc_write_space: someone sleeping on %p\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 svsk);
Eric Dumazeteaefd112011-02-18 03:26:36 +0000437 wake_up_interruptible(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 }
439}
440
Trond Myklebust47fcb032009-05-18 17:47:56 -0400441static void svc_tcp_write_space(struct sock *sk)
442{
443 struct socket *sock = sk->sk_socket;
444
445 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock)
446 clear_bit(SOCK_NOSPACE, &sock->flags);
447 svc_write_space(sk);
448}
449
Tom Tucker9dbc2402007-12-30 21:08:12 -0600450/*
Chuck Lever7702ce42009-07-13 10:54:26 -0400451 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
452 */
453static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
454 struct cmsghdr *cmh)
455{
456 struct in_pktinfo *pki = CMSG_DATA(cmh);
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800457 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
458
Chuck Lever7702ce42009-07-13 10:54:26 -0400459 if (cmh->cmsg_type != IP_PKTINFO)
460 return 0;
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800461
462 daddr->sin_family = AF_INET;
463 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
Chuck Lever7702ce42009-07-13 10:54:26 -0400464 return 1;
465}
466
467/*
Tom Parkin73df66f2013-01-31 01:02:24 +0000468 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
Chuck Lever7702ce42009-07-13 10:54:26 -0400469 */
470static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
471 struct cmsghdr *cmh)
472{
473 struct in6_pktinfo *pki = CMSG_DATA(cmh);
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800474 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
475
Chuck Lever7702ce42009-07-13 10:54:26 -0400476 if (cmh->cmsg_type != IPV6_PKTINFO)
477 return 0;
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800478
479 daddr->sin6_family = AF_INET6;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000480 daddr->sin6_addr = pki->ipi6_addr;
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800481 daddr->sin6_scope_id = pki->ipi6_ifindex;
Chuck Lever7702ce42009-07-13 10:54:26 -0400482 return 1;
483}
484
485/*
Tom Tucker9dbc2402007-12-30 21:08:12 -0600486 * Copy the UDP datagram's destination address to the rqstp structure.
487 * The 'destination' address in this case is the address to which the
488 * peer sent the datagram, i.e. our local address. For multihomed
489 * hosts, this can change from msg to msg. Note that only the IP
490 * address changes, the port number should remain the same.
491 */
Chuck Lever7702ce42009-07-13 10:54:26 -0400492static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
493 struct cmsghdr *cmh)
Chuck Lever95756482007-02-12 00:53:38 -0800494{
Chuck Lever7702ce42009-07-13 10:54:26 -0400495 switch (cmh->cmsg_level) {
496 case SOL_IP:
497 return svc_udp_get_dest_address4(rqstp, cmh);
498 case SOL_IPV6:
499 return svc_udp_get_dest_address6(rqstp, cmh);
Chuck Lever95756482007-02-12 00:53:38 -0800500 }
Chuck Lever7702ce42009-07-13 10:54:26 -0400501
502 return 0;
Chuck Lever95756482007-02-12 00:53:38 -0800503}
504
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505/*
506 * Receive a datagram from a UDP socket.
507 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600508static int svc_udp_recvfrom(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600510 struct svc_sock *svsk =
511 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600512 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 struct sk_buff *skb;
David S. Millerbc375ea2007-04-12 13:35:59 -0700514 union {
515 struct cmsghdr hdr;
516 long all[SVC_PKTINFO_SPACE / sizeof(long)];
517 } buffer;
518 struct cmsghdr *cmh = &buffer.hdr;
NeilBrown7a37f572007-03-06 01:42:21 -0800519 struct msghdr msg = {
520 .msg_name = svc_addr(rqstp),
521 .msg_control = cmh,
522 .msg_controllen = sizeof(buffer),
523 .msg_flags = MSG_DONTWAIT,
524 };
Chuck Leverabc5c442009-04-23 19:31:25 -0400525 size_t len;
526 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Tom Tucker02fc6c32007-12-30 21:07:48 -0600528 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 /* udp sockets need large rcvbuf as all pending
530 * requests are still in that buffer. sndbuf must
531 * also be large enough that there is enough space
Greg Banks3262c812006-10-02 02:17:58 -0700532 * for one reply per thread. We count all threads
533 * rather than threads in a particular pool, which
534 * provides an upper bound on the number of threads
535 * which will access the socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 */
537 svc_sock_setbufsize(svsk->sk_sock,
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700538 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
539 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
Tom Tucker02fc6c32007-12-30 21:07:48 -0600541 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
NeilBrown05ed6902007-05-09 02:34:55 -0700542 skb = NULL;
543 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
544 0, 0, MSG_PEEK | MSG_DONTWAIT);
545 if (err >= 0)
546 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
547
548 if (skb == NULL) {
549 if (err != -EAGAIN) {
550 /* possibly an icmp error */
551 dprintk("svc: recvfrom returned error %d\n", -err);
Tom Tucker02fc6c32007-12-30 21:07:48 -0600552 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 }
J. Bruce Fields9f9d2eb2012-08-17 21:35:24 -0400554 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 }
Tom Tucker9dbc2402007-12-30 21:08:12 -0600556 len = svc_addr_len(svc_addr(rqstp));
Tom Tucker9dbc2402007-12-30 21:08:12 -0600557 rqstp->rq_addrlen = len;
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700558 if (skb->tstamp.tv64 == 0) {
559 skb->tstamp = ktime_get_real();
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800560 /* Don't enable netstamp, sunrpc doesn't
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 need that much accuracy */
562 }
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700563 svsk->sk_sk->sk_stamp = skb->tstamp;
Tom Tucker02fc6c32007-12-30 21:07:48 -0600564 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 len = skb->len - sizeof(struct udphdr);
567 rqstp->rq_arg.len = len;
568
Chuck Lever95756482007-02-12 00:53:38 -0800569 rqstp->rq_prot = IPPROTO_UDP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Chuck Lever7702ce42009-07-13 10:54:26 -0400571 if (!svc_udp_get_dest_address(rqstp, cmh)) {
Joe Perchese87cc472012-05-13 21:56:26 +0000572 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
573 cmh->cmsg_level, cmh->cmsg_type);
J. Bruce Fieldsf23abfd2012-08-17 20:32:27 -0400574 goto out_free;
NeilBrown7a37f572007-03-06 01:42:21 -0800575 }
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800576 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
578 if (skb_is_nonlinear(skb)) {
579 /* we have to copy */
580 local_bh_disable();
581 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
582 local_bh_enable();
583 /* checksum error */
Eric Dumazet22911fc2012-06-27 00:23:44 +0000584 goto out_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 }
586 local_bh_enable();
Eric Dumazet9d410c72009-10-30 05:03:53 +0000587 skb_free_datagram_locked(svsk->sk_sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 } else {
589 /* we can use it in-place */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600590 rqstp->rq_arg.head[0].iov_base = skb->data +
591 sizeof(struct udphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 rqstp->rq_arg.head[0].iov_len = len;
Eric Dumazet22911fc2012-06-27 00:23:44 +0000593 if (skb_checksum_complete(skb))
594 goto out_free;
Tom Tucker5148bf42007-12-30 21:07:25 -0600595 rqstp->rq_xprt_ctxt = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 }
597
598 rqstp->rq_arg.page_base = 0;
599 if (len <= rqstp->rq_arg.head[0].iov_len) {
600 rqstp->rq_arg.head[0].iov_len = len;
601 rqstp->rq_arg.page_len = 0;
NeilBrown44524352006-10-04 02:15:46 -0700602 rqstp->rq_respages = rqstp->rq_pages+1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 } else {
604 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
NeilBrown44524352006-10-04 02:15:46 -0700605 rqstp->rq_respages = rqstp->rq_pages + 1 +
Ilpo Järvinen172589c2007-08-28 15:50:33 -0700606 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 }
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500608 rqstp->rq_next_page = rqstp->rq_respages+1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
610 if (serv->sv_stats)
611 serv->sv_stats->netudpcnt++;
612
613 return len;
J. Bruce Fieldsf23abfd2012-08-17 20:32:27 -0400614out_free:
615 trace_kfree_skb(skb, svc_udp_recvfrom);
616 skb_free_datagram_locked(svsk->sk_sk, skb);
617 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618}
619
620static int
621svc_udp_sendto(struct svc_rqst *rqstp)
622{
623 int error;
624
625 error = svc_sendto(rqstp, &rqstp->rq_res);
626 if (error == -ECONNREFUSED)
627 /* ICMP error on earlier request. */
628 error = svc_sendto(rqstp, &rqstp->rq_res);
629
630 return error;
631}
632
Tom Tuckere831fe62007-12-30 21:07:29 -0600633static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
634{
635}
636
Tom Tucker323bee32007-12-30 21:07:31 -0600637static int svc_udp_has_wspace(struct svc_xprt *xprt)
638{
639 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600640 struct svc_serv *serv = xprt->xpt_server;
Tom Tucker323bee32007-12-30 21:07:31 -0600641 unsigned long required;
642
643 /*
644 * Set the SOCK_NOSPACE flag before checking the available
645 * sock space.
646 */
647 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
Tom Tucker7a90e8c2007-12-30 21:07:55 -0600648 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
Tom Tucker323bee32007-12-30 21:07:31 -0600649 if (required*2 > sock_wspace(svsk->sk_sk))
650 return 0;
651 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
652 return 1;
653}
654
Tom Tucker38a417c2007-12-30 21:07:36 -0600655static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
656{
657 BUG();
658 return NULL;
659}
660
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600661static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
Pavel Emelyanov62832c02010-09-29 16:04:18 +0400662 struct net *net,
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600663 struct sockaddr *sa, int salen,
664 int flags)
665{
Pavel Emelyanov62832c02010-09-29 16:04:18 +0400666 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600667}
668
Tom Tucker360d87382007-12-30 21:07:17 -0600669static struct svc_xprt_ops svc_udp_ops = {
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600670 .xpo_create = svc_udp_create,
Tom Tucker5d137992007-12-30 21:07:23 -0600671 .xpo_recvfrom = svc_udp_recvfrom,
672 .xpo_sendto = svc_udp_sendto,
Tom Tucker5148bf42007-12-30 21:07:25 -0600673 .xpo_release_rqst = svc_release_skb,
Tom Tucker755ccea2007-12-30 21:07:27 -0600674 .xpo_detach = svc_sock_detach,
675 .xpo_free = svc_sock_free,
Tom Tuckere831fe62007-12-30 21:07:29 -0600676 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
Tom Tucker323bee32007-12-30 21:07:31 -0600677 .xpo_has_wspace = svc_udp_has_wspace,
Tom Tucker38a417c2007-12-30 21:07:36 -0600678 .xpo_accept = svc_udp_accept,
Tom Tucker360d87382007-12-30 21:07:17 -0600679};
680
681static struct svc_xprt_class svc_udp_class = {
682 .xcl_name = "udp",
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600683 .xcl_owner = THIS_MODULE,
Tom Tucker360d87382007-12-30 21:07:17 -0600684 .xcl_ops = &svc_udp_ops,
Tom Tucker49023152007-12-30 21:07:21 -0600685 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
Tom Tucker360d87382007-12-30 21:07:17 -0600686};
687
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600688static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689{
Chuck Lever7702ce42009-07-13 10:54:26 -0400690 int err, level, optname, one = 1;
NeilBrown7a37f572007-03-06 01:42:21 -0800691
Stanislav Kinsburskybd4620d2011-12-06 14:19:10 +0300692 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
693 &svsk->sk_xprt, serv);
Tom Tuckerdef13d72007-12-30 21:08:08 -0600694 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
696 svsk->sk_sk->sk_write_space = svc_write_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
698 /* initialise setting must have enough space to
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800699 * receive and respond to one request.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 * svc_udp_recvfrom will re-adjust if necessary
701 */
702 svc_sock_setbufsize(svsk->sk_sock,
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600703 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
704 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
Tom Tucker0f0257e2007-12-30 21:08:27 -0600706 /* data might have come in before data_ready set up */
707 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Tom Tucker02fc6c32007-12-30 21:07:48 -0600708 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
NeilBrown7a37f572007-03-06 01:42:21 -0800709
NeilBrown7a37f572007-03-06 01:42:21 -0800710 /* make sure we get destination address info */
Chuck Lever7702ce42009-07-13 10:54:26 -0400711 switch (svsk->sk_sk->sk_family) {
712 case AF_INET:
713 level = SOL_IP;
714 optname = IP_PKTINFO;
715 break;
716 case AF_INET6:
717 level = SOL_IPV6;
718 optname = IPV6_RECVPKTINFO;
719 break;
720 default:
721 BUG();
722 }
723 err = kernel_setsockopt(svsk->sk_sock, level, optname,
724 (char *)&one, sizeof(one));
725 dprintk("svc: kernel_setsockopt returned %d\n", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726}
727
728/*
729 * A data_ready event on a listening socket means there's a connection
730 * pending. Do not use state_change as a substitute for it.
731 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600732static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733{
Neil Brown939bb7e2005-09-13 01:25:39 -0700734 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000735 wait_queue_head_t *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736
737 dprintk("svc: socket %p TCP (listen) state change %d\n",
Neil Brown939bb7e2005-09-13 01:25:39 -0700738 sk, sk->sk_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
Neil Brown939bb7e2005-09-13 01:25:39 -0700740 /*
741 * This callback may called twice when a new connection
742 * is established as a child socket inherits everything
743 * from a parent LISTEN socket.
744 * 1) data_ready method of the parent socket will be called
745 * when one of child sockets become ESTABLISHED.
746 * 2) data_ready method of the child socket may be called
747 * when it receives data before the socket is accepted.
748 * In case of 2, we should ignore it silently.
749 */
750 if (sk->sk_state == TCP_LISTEN) {
751 if (svsk) {
Tom Tucker02fc6c32007-12-30 21:07:48 -0600752 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600753 svc_xprt_enqueue(&svsk->sk_xprt);
Neil Brown939bb7e2005-09-13 01:25:39 -0700754 } else
755 printk("svc: socket %p: no user data\n", sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 }
Neil Brown939bb7e2005-09-13 01:25:39 -0700757
Eric Dumazeteaefd112011-02-18 03:26:36 +0000758 wq = sk_sleep(sk);
759 if (wq && waitqueue_active(wq))
760 wake_up_interruptible_all(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761}
762
763/*
764 * A state change on a connected socket means it's dying or dead.
765 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600766static void svc_tcp_state_change(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
Neil Brown939bb7e2005-09-13 01:25:39 -0700768 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000769 wait_queue_head_t *wq = sk_sleep(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
771 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
Neil Brown939bb7e2005-09-13 01:25:39 -0700772 sk, sk->sk_state, sk->sk_user_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
Neil Brown939bb7e2005-09-13 01:25:39 -0700774 if (!svsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 printk("svc: socket %p: no user data\n", sk);
Neil Brown939bb7e2005-09-13 01:25:39 -0700776 else {
Tom Tucker02fc6c32007-12-30 21:07:48 -0600777 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600778 svc_xprt_enqueue(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 }
Eric Dumazeteaefd112011-02-18 03:26:36 +0000780 if (wq && waitqueue_active(wq))
781 wake_up_interruptible_all(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782}
783
Tom Tucker0f0257e2007-12-30 21:08:27 -0600784static void svc_tcp_data_ready(struct sock *sk, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785{
Neil Brown939bb7e2005-09-13 01:25:39 -0700786 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000787 wait_queue_head_t *wq = sk_sleep(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
789 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
Neil Brown939bb7e2005-09-13 01:25:39 -0700790 sk, sk->sk_user_data);
791 if (svsk) {
Tom Tucker02fc6c32007-12-30 21:07:48 -0600792 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600793 svc_xprt_enqueue(&svsk->sk_xprt);
Neil Brown939bb7e2005-09-13 01:25:39 -0700794 }
Eric Dumazeteaefd112011-02-18 03:26:36 +0000795 if (wq && waitqueue_active(wq))
796 wake_up_interruptible(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797}
798
799/*
800 * Accept a TCP connection
801 */
Tom Tucker38a417c2007-12-30 21:07:36 -0600802static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803{
Tom Tucker38a417c2007-12-30 21:07:36 -0600804 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800805 struct sockaddr_storage addr;
806 struct sockaddr *sin = (struct sockaddr *) &addr;
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600807 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 struct socket *sock = svsk->sk_sock;
809 struct socket *newsock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 struct svc_sock *newsvsk;
811 int err, slen;
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +0300812 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
814 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
815 if (!sock)
Tom Tucker38a417c2007-12-30 21:07:36 -0600816 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
Tom Tucker02fc6c32007-12-30 21:07:48 -0600818 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700819 err = kernel_accept(sock, &newsock, O_NONBLOCK);
820 if (err < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 if (err == -ENOMEM)
822 printk(KERN_WARNING "%s: no more sockets!\n",
823 serv->sv_name);
Joe Perchese87cc472012-05-13 21:56:26 +0000824 else if (err != -EAGAIN)
825 net_warn_ratelimited("%s: accept failed (err %d)!\n",
826 serv->sv_name, -err);
Tom Tucker38a417c2007-12-30 21:07:36 -0600827 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 }
Tom Tucker02fc6c32007-12-30 21:07:48 -0600829 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800831 err = kernel_getpeername(newsock, sin, &slen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 if (err < 0) {
Joe Perchese87cc472012-05-13 21:56:26 +0000833 net_warn_ratelimited("%s: peername failed (err %d)!\n",
834 serv->sv_name, -err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 goto failed; /* aborted connection or whatever */
836 }
837
838 /* Ideally, we would want to reject connections from unauthorized
Chuck Leverad06e4b2007-02-12 00:53:32 -0800839 * hosts here, but when we get encryption, the IP of the host won't
840 * tell us anything. For now just warn about unpriv connections.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 */
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800842 if (!svc_port_is_privileged(sin)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 dprintk(KERN_WARNING
Chuck Leverad06e4b2007-02-12 00:53:32 -0800844 "%s: connect from unprivileged port: %s\n",
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800845 serv->sv_name,
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800846 __svc_print_addr(sin, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 }
Chuck Leverad06e4b2007-02-12 00:53:32 -0800848 dprintk("%s: connect from %s\n", serv->sv_name,
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800849 __svc_print_addr(sin, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
851 /* make sure that a write doesn't block forever when
852 * low on memory
853 */
854 newsock->sk->sk_sndtimeo = HZ*30;
855
J. Bruce Fields72c35372012-08-13 17:46:17 -0400856 newsvsk = svc_setup_socket(serv, newsock,
857 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
858 if (IS_ERR(newsvsk))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 goto failed;
Tom Tucker9dbc2402007-12-30 21:08:12 -0600860 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
Frank van Maarseveena9747692007-07-09 22:21:39 +0200861 err = kernel_getsockname(newsock, sin, &slen);
862 if (unlikely(err < 0)) {
863 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
864 slen = offsetof(struct sockaddr, sa_data);
865 }
Tom Tucker9dbc2402007-12-30 21:08:12 -0600866 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
Chuck Lever067d7812007-02-12 00:53:30 -0800867
Tom Tuckerf9f3cc42007-12-30 21:07:40 -0600868 if (serv->sv_stats)
869 serv->sv_stats->nettcpconn++;
870
871 return &newsvsk->sk_xprt;
872
873failed:
874 sock_release(newsock);
875 return NULL;
876}
877
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800878static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
879{
880 unsigned int i, len, npages;
881
J. Bruce Fields8af345f2012-12-03 16:45:35 -0500882 if (svsk->sk_datalen == 0)
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800883 return 0;
J. Bruce Fields8af345f2012-12-03 16:45:35 -0500884 len = svsk->sk_datalen;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800885 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
886 for (i = 0; i < npages; i++) {
887 if (rqstp->rq_pages[i] != NULL)
888 put_page(rqstp->rq_pages[i]);
889 BUG_ON(svsk->sk_pages[i] == NULL);
890 rqstp->rq_pages[i] = svsk->sk_pages[i];
891 svsk->sk_pages[i] = NULL;
892 }
893 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
894 return len;
895}
896
897static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
898{
899 unsigned int i, len, npages;
900
J. Bruce Fields8af345f2012-12-03 16:45:35 -0500901 if (svsk->sk_datalen == 0)
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800902 return;
J. Bruce Fields8af345f2012-12-03 16:45:35 -0500903 len = svsk->sk_datalen;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800904 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
905 for (i = 0; i < npages; i++) {
906 svsk->sk_pages[i] = rqstp->rq_pages[i];
907 rqstp->rq_pages[i] = NULL;
908 }
909}
910
911static void svc_tcp_clear_pages(struct svc_sock *svsk)
912{
913 unsigned int i, len, npages;
914
J. Bruce Fields8af345f2012-12-03 16:45:35 -0500915 if (svsk->sk_datalen == 0)
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800916 goto out;
J. Bruce Fields8af345f2012-12-03 16:45:35 -0500917 len = svsk->sk_datalen;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800918 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
919 for (i = 0; i < npages; i++) {
J. Bruce Fieldscf3aa022013-06-26 11:09:06 -0400920 if (svsk->sk_pages[i] == NULL) {
921 WARN_ON_ONCE(1);
922 continue;
923 }
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800924 put_page(svsk->sk_pages[i]);
925 svsk->sk_pages[i] = NULL;
926 }
927out:
928 svsk->sk_tcplen = 0;
J. Bruce Fields8af345f2012-12-03 16:45:35 -0500929 svsk->sk_datalen = 0;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800930}
931
Tom Tuckerf9f3cc42007-12-30 21:07:40 -0600932/*
J. Bruce Fieldsad46ccf2012-12-03 16:30:42 -0500933 * Receive fragment record header.
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300934 * If we haven't gotten the record length yet, get the next four bytes.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 */
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300936static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937{
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600938 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Trond Myklebust5ee78d42009-05-18 17:47:56 -0400939 unsigned int want;
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300940 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
Tom Tucker02fc6c32007-12-30 21:07:48 -0600942 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
Chuck Leverc0401ea2008-04-14 12:27:30 -0400944 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 struct kvec iov;
946
Trond Myklebust5ee78d42009-05-18 17:47:56 -0400947 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
949 iov.iov_len = want;
950 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
951 goto error;
952 svsk->sk_tcplen += len;
953
954 if (len < want) {
Chuck Leverc0401ea2008-04-14 12:27:30 -0400955 dprintk("svc: short recvfrom while reading record "
956 "length (%d of %d)\n", len, want);
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800957 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 }
959
J. Bruce Fieldscc248d42012-12-03 16:11:13 -0500960 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));
J. Bruce Fields836fbad2012-12-03 15:50:38 -0500961 if (svc_sock_reclen(svsk) + svsk->sk_datalen >
962 serv->sv_max_mesg) {
J. Bruce Fields3a28e332012-12-10 18:15:07 -0500963 net_notice_ratelimited("RPC: fragment too large: %d\n",
964 svc_sock_reclen(svsk));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 goto err_delete;
966 }
967 }
968
J. Bruce Fieldscc248d42012-12-03 16:11:13 -0500969 return svc_sock_reclen(svsk);
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800970error:
971 dprintk("RPC: TCP recv_record got %d\n", len);
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300972 return len;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800973err_delete:
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300974 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300975 return -EAGAIN;
976}
977
Trond Myklebust586c52c2009-05-18 17:47:56 -0400978static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300979{
Trond Myklebust586c52c2009-05-18 17:47:56 -0400980 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300981 struct rpc_rqst *req = NULL;
Trond Myklebust586c52c2009-05-18 17:47:56 -0400982 struct kvec *src, *dst;
983 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
J. Bruce Fields48e65552011-02-14 14:52:03 -0500984 __be32 xid;
985 __be32 calldir;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300986
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300987 xid = *p++;
988 calldir = *p;
989
Trond Myklebust586c52c2009-05-18 17:47:56 -0400990 if (bc_xprt)
991 req = xprt_lookup_rqst(bc_xprt, xid);
J. Bruce Fieldsd75faea2010-11-30 19:15:01 -0500992
Trond Myklebust586c52c2009-05-18 17:47:56 -0400993 if (!req) {
994 printk(KERN_NOTICE
995 "%s: Got unrecognized reply: "
996 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
997 __func__, ntohl(calldir),
998 bc_xprt, xid);
999 return -EAGAIN;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001000 }
Trond Myklebust586c52c2009-05-18 17:47:56 -04001001
1002 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
1003 /*
1004 * XXX!: cheating for now! Only copying HEAD.
1005 * But we know this is good enough for now (in fact, for any
1006 * callback reply in the forseeable future).
1007 */
1008 dst = &req->rq_private_buf.head[0];
1009 src = &rqstp->rq_arg.head[0];
1010 if (dst->iov_len < src->iov_len)
1011 return -EAGAIN; /* whatever; just giving up. */
1012 memcpy(dst->iov_base, src->iov_base, src->iov_len);
J. Bruce Fieldscc248d42012-12-03 16:11:13 -05001013 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
Trond Myklebust586c52c2009-05-18 17:47:56 -04001014 rqstp->rq_arg.len = 0;
1015 return 0;
1016}
1017
1018static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1019{
1020 int i = 0;
1021 int t = 0;
1022
1023 while (t < len) {
1024 vec[i].iov_base = page_address(pages[i]);
1025 vec[i].iov_len = PAGE_SIZE;
1026 i++;
1027 t += PAGE_SIZE;
1028 }
1029 return i;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001030}
1031
J. Bruce Fields836fbad2012-12-03 15:50:38 -05001032static void svc_tcp_fragment_received(struct svc_sock *svsk)
1033{
1034 /* If we have more data, signal svc_xprt_enqueue() to try again */
1035 if (svc_recv_available(svsk) > sizeof(rpc_fraghdr))
1036 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1037 dprintk("svc: TCP %s record (%d bytes)\n",
1038 svc_sock_final_rec(svsk) ? "final" : "nonfinal",
1039 svc_sock_reclen(svsk));
1040 svsk->sk_tcplen = 0;
1041 svsk->sk_reclen = 0;
1042}
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001043
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001044/*
1045 * Receive data from a TCP socket.
1046 */
1047static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1048{
1049 struct svc_sock *svsk =
1050 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1051 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1052 int len;
1053 struct kvec *vec;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001054 unsigned int want, base;
Trond Myklebust586c52c2009-05-18 17:47:56 -04001055 __be32 *p;
1056 __be32 calldir;
Trond Myklebust5ee78d42009-05-18 17:47:56 -04001057 int pnum;
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001058
1059 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1060 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1061 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1062 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1063
1064 len = svc_tcp_recv_record(svsk, rqstp);
1065 if (len < 0)
1066 goto error;
1067
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001068 base = svc_tcp_restore_pages(svsk, rqstp);
J. Bruce Fields836fbad2012-12-03 15:50:38 -05001069 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001070
NeilBrown3cc03b12006-10-04 02:15:47 -07001071 vec = rqstp->rq_vec;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001072
Trond Myklebust586c52c2009-05-18 17:47:56 -04001073 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
J. Bruce Fields836fbad2012-12-03 15:50:38 -05001074 svsk->sk_datalen + want);
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001075
NeilBrown44524352006-10-04 02:15:46 -07001076 rqstp->rq_respages = &rqstp->rq_pages[pnum];
J. Bruce Fieldsafc59402012-12-10 18:01:37 -05001077 rqstp->rq_next_page = rqstp->rq_respages + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078
1079 /* Now receive data */
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001080 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
J. Bruce Fields8af345f2012-12-03 16:45:35 -05001081 if (len >= 0) {
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001082 svsk->sk_tcplen += len;
J. Bruce Fields8af345f2012-12-03 16:45:35 -05001083 svsk->sk_datalen += len;
1084 }
J. Bruce Fields836fbad2012-12-03 15:50:38 -05001085 if (len != want || !svc_sock_final_rec(svsk)) {
J. Bruce Fieldsbe1e4442012-08-09 18:12:28 -04001086 svc_tcp_save_pages(svsk, rqstp);
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001087 if (len < 0 && len != -EAGAIN)
J. Bruce Fieldsad46ccf2012-12-03 16:30:42 -05001088 goto err_delete;
J. Bruce Fields836fbad2012-12-03 15:50:38 -05001089 if (len == want)
1090 svc_tcp_fragment_received(svsk);
1091 else
J. Bruce Fields3a28e332012-12-10 18:15:07 -05001092 dprintk("svc: incomplete TCP record (%d of %d)\n",
1093 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
J. Bruce Fields836fbad2012-12-03 15:50:38 -05001094 svc_sock_reclen(svsk));
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001095 goto err_noclose;
1096 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097
J. Bruce Fields1f691b02013-06-26 10:55:40 -04001098 if (svsk->sk_datalen < 8) {
J. Bruce Fieldscf3aa022013-06-26 11:09:06 -04001099 svsk->sk_datalen = 0;
J. Bruce Fieldsad46ccf2012-12-03 16:30:42 -05001100 goto err_delete; /* client is nuts. */
J. Bruce Fieldscf3aa022013-06-26 11:09:06 -04001101 }
J. Bruce Fieldsad46ccf2012-12-03 16:30:42 -05001102
J. Bruce Fields836fbad2012-12-03 15:50:38 -05001103 rqstp->rq_arg.len = svsk->sk_datalen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 rqstp->rq_arg.page_base = 0;
Trond Myklebust5ee78d42009-05-18 17:47:56 -04001105 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1106 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 rqstp->rq_arg.page_len = 0;
Trond Myklebust5ee78d42009-05-18 17:47:56 -04001108 } else
1109 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110
Tom Tucker5148bf42007-12-30 21:07:25 -06001111 rqstp->rq_xprt_ctxt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 rqstp->rq_prot = IPPROTO_TCP;
1113
Trond Myklebust586c52c2009-05-18 17:47:56 -04001114 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1115 calldir = p[1];
J. Bruce Fields8985ef02011-04-09 10:03:10 -04001116 if (calldir)
Trond Myklebust586c52c2009-05-18 17:47:56 -04001117 len = receive_cb_reply(svsk, rqstp);
Trond Myklebust586c52c2009-05-18 17:47:56 -04001118
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 /* Reset TCP read info */
J. Bruce Fields8af345f2012-12-03 16:45:35 -05001120 svsk->sk_datalen = 0;
J. Bruce Fields836fbad2012-12-03 15:50:38 -05001121 svc_tcp_fragment_received(svsk);
Trond Myklebust0601f792009-05-18 17:47:56 -04001122
J. Bruce Fields8985ef02011-04-09 10:03:10 -04001123 if (len < 0)
1124 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125
Tom Tucker9dbc2402007-12-30 21:08:12 -06001126 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 if (serv->sv_stats)
1128 serv->sv_stats->nettcpcnt++;
1129
Trond Myklebust5ee78d42009-05-18 17:47:56 -04001130 return rqstp->rq_arg.len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001132error:
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001133 if (len != -EAGAIN)
J. Bruce Fieldsad46ccf2012-12-03 16:30:42 -05001134 goto err_delete;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001135 dprintk("RPC: TCP recvfrom got EAGAIN\n");
J. Bruce Fields9f9d2eb2012-08-17 21:35:24 -04001136 return 0;
J. Bruce Fieldsad46ccf2012-12-03 16:30:42 -05001137err_delete:
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001138 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1139 svsk->sk_xprt.xpt_server->sv_name, -len);
1140 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1141err_noclose:
J. Bruce Fields9f9d2eb2012-08-17 21:35:24 -04001142 return 0; /* record not complete */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143}
1144
1145/*
1146 * Send out data on TCP socket.
1147 */
Tom Tucker0f0257e2007-12-30 21:08:27 -06001148static int svc_tcp_sendto(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149{
1150 struct xdr_buf *xbufp = &rqstp->rq_res;
1151 int sent;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001152 __be32 reclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153
1154 /* Set up the first element of the reply kvec.
1155 * Any other kvecs that may be in use have been taken
1156 * care of by the server implementation itself.
1157 */
1158 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1159 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1160
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 sent = svc_sendto(rqstp, &rqstp->rq_res);
1162 if (sent != xbufp->len) {
Tom Tucker0f0257e2007-12-30 21:08:27 -06001163 printk(KERN_NOTICE
1164 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1165 "- shutting down socket\n",
Tom Tucker57b1d3b2007-12-30 21:08:22 -06001166 rqstp->rq_xprt->xpt_server->sv_name,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 (sent<0)?"got error":"sent only",
1168 sent, xbufp->len);
Tom Tucker57b1d3b2007-12-30 21:08:22 -06001169 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -06001170 svc_xprt_enqueue(rqstp->rq_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 sent = -EAGAIN;
1172 }
1173 return sent;
1174}
1175
Tom Tuckere831fe62007-12-30 21:07:29 -06001176/*
1177 * Setup response header. TCP has a 4B record length field.
1178 */
1179static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1180{
1181 struct kvec *resv = &rqstp->rq_res.head[0];
1182
1183 /* tcp needs a space for the record length... */
1184 svc_putnl(resv, 0);
1185}
1186
Tom Tucker323bee32007-12-30 21:07:31 -06001187static int svc_tcp_has_wspace(struct svc_xprt *xprt)
1188{
Tom Tucker57b1d3b2007-12-30 21:08:22 -06001189 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
Trond Myklebust47fcb032009-05-18 17:47:56 -04001190 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Tom Tucker323bee32007-12-30 21:07:31 -06001191 int required;
Tom Tucker323bee32007-12-30 21:07:31 -06001192
Trond Myklebust47fcb032009-05-18 17:47:56 -04001193 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
1194 return 1;
1195 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
NeilBrown447383d2013-07-25 11:30:23 +10001196 if (sk_stream_wspace(svsk->sk_sk) >= required ||
1197 (sk_stream_min_wspace(svsk->sk_sk) == 0 &&
1198 atomic_read(&xprt->xpt_reserved) == 0))
Trond Myklebust47fcb032009-05-18 17:47:56 -04001199 return 1;
Tom Tucker323bee32007-12-30 21:07:31 -06001200 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
Trond Myklebust47fcb032009-05-18 17:47:56 -04001201 return 0;
Tom Tucker323bee32007-12-30 21:07:31 -06001202}
1203
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001204static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
Pavel Emelyanov62832c02010-09-29 16:04:18 +04001205 struct net *net,
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001206 struct sockaddr *sa, int salen,
1207 int flags)
1208{
Pavel Emelyanov62832c02010-09-29 16:04:18 +04001209 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001210}
1211
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001212#if defined(CONFIG_SUNRPC_BACKCHANNEL)
Andy Adamson1f11a032011-01-06 02:04:26 +00001213static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
1214 struct net *, struct sockaddr *,
1215 int, int);
1216static void svc_bc_sock_free(struct svc_xprt *xprt);
1217
1218static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
1219 struct net *net,
1220 struct sockaddr *sa, int salen,
1221 int flags)
1222{
1223 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1224}
1225
1226static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
1227{
1228}
1229
1230static struct svc_xprt_ops svc_tcp_bc_ops = {
1231 .xpo_create = svc_bc_tcp_create,
1232 .xpo_detach = svc_bc_tcp_sock_detach,
1233 .xpo_free = svc_bc_sock_free,
1234 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1235};
1236
1237static struct svc_xprt_class svc_tcp_bc_class = {
1238 .xcl_name = "tcp-bc",
1239 .xcl_owner = THIS_MODULE,
1240 .xcl_ops = &svc_tcp_bc_ops,
1241 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1242};
Andy Adamson16b2d1e2011-01-06 02:04:27 +00001243
1244static void svc_init_bc_xprt_sock(void)
1245{
1246 svc_reg_xprt_class(&svc_tcp_bc_class);
1247}
1248
1249static void svc_cleanup_bc_xprt_sock(void)
1250{
1251 svc_unreg_xprt_class(&svc_tcp_bc_class);
1252}
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001253#else /* CONFIG_SUNRPC_BACKCHANNEL */
Andy Adamson16b2d1e2011-01-06 02:04:27 +00001254static void svc_init_bc_xprt_sock(void)
1255{
1256}
1257
1258static void svc_cleanup_bc_xprt_sock(void)
1259{
1260}
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001261#endif /* CONFIG_SUNRPC_BACKCHANNEL */
Andy Adamson1f11a032011-01-06 02:04:26 +00001262
Tom Tucker360d87382007-12-30 21:07:17 -06001263static struct svc_xprt_ops svc_tcp_ops = {
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001264 .xpo_create = svc_tcp_create,
Tom Tucker5d137992007-12-30 21:07:23 -06001265 .xpo_recvfrom = svc_tcp_recvfrom,
1266 .xpo_sendto = svc_tcp_sendto,
Tom Tucker5148bf42007-12-30 21:07:25 -06001267 .xpo_release_rqst = svc_release_skb,
Trond Myklebust69b6ba32008-12-23 16:30:11 -05001268 .xpo_detach = svc_tcp_sock_detach,
Tom Tucker755ccea2007-12-30 21:07:27 -06001269 .xpo_free = svc_sock_free,
Tom Tuckere831fe62007-12-30 21:07:29 -06001270 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
Tom Tucker323bee32007-12-30 21:07:31 -06001271 .xpo_has_wspace = svc_tcp_has_wspace,
Tom Tucker38a417c2007-12-30 21:07:36 -06001272 .xpo_accept = svc_tcp_accept,
Tom Tucker360d87382007-12-30 21:07:17 -06001273};
1274
1275static struct svc_xprt_class svc_tcp_class = {
1276 .xcl_name = "tcp",
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001277 .xcl_owner = THIS_MODULE,
Tom Tucker360d87382007-12-30 21:07:17 -06001278 .xcl_ops = &svc_tcp_ops,
Tom Tucker49023152007-12-30 21:07:21 -06001279 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
Tom Tucker360d87382007-12-30 21:07:17 -06001280};
1281
1282void svc_init_xprt_sock(void)
1283{
1284 svc_reg_xprt_class(&svc_tcp_class);
1285 svc_reg_xprt_class(&svc_udp_class);
Andy Adamson16b2d1e2011-01-06 02:04:27 +00001286 svc_init_bc_xprt_sock();
Tom Tucker360d87382007-12-30 21:07:17 -06001287}
1288
1289void svc_cleanup_xprt_sock(void)
1290{
1291 svc_unreg_xprt_class(&svc_tcp_class);
1292 svc_unreg_xprt_class(&svc_udp_class);
Andy Adamson16b2d1e2011-01-06 02:04:27 +00001293 svc_cleanup_bc_xprt_sock();
Tom Tucker360d87382007-12-30 21:07:17 -06001294}
1295
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001296static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297{
1298 struct sock *sk = svsk->sk_sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299
Stanislav Kinsburskybd4620d2011-12-06 14:19:10 +03001300 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1301 &svsk->sk_xprt, serv);
Tom Tuckerdef13d72007-12-30 21:08:08 -06001302 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 if (sk->sk_state == TCP_LISTEN) {
1304 dprintk("setting up TCP socket for listening\n");
Tom Tucker02fc6c32007-12-30 21:07:48 -06001305 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 sk->sk_data_ready = svc_tcp_listen_data_ready;
Tom Tucker02fc6c32007-12-30 21:07:48 -06001307 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 } else {
1309 dprintk("setting up TCP socket for reading\n");
1310 sk->sk_state_change = svc_tcp_state_change;
1311 sk->sk_data_ready = svc_tcp_data_ready;
Trond Myklebust47fcb032009-05-18 17:47:56 -04001312 sk->sk_write_space = svc_tcp_write_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313
1314 svsk->sk_reclen = 0;
1315 svsk->sk_tcplen = 0;
J. Bruce Fields8af345f2012-12-03 16:45:35 -05001316 svsk->sk_datalen = 0;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001317 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318
Chuck Leverb7872fe2008-04-14 12:27:01 -04001319 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320
Tom Tucker02fc6c32007-12-30 21:07:48 -06001321 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001322 if (sk->sk_state != TCP_ESTABLISHED)
Tom Tucker02fc6c32007-12-30 21:07:48 -06001323 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 }
1325}
1326
Tom Tucker0f0257e2007-12-30 21:08:27 -06001327void svc_sock_update_bufs(struct svc_serv *serv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328{
1329 /*
1330 * The number of server threads has changed. Update
1331 * rcvbuf and sndbuf accordingly on all sockets
1332 */
Pavel Emelyanov8f3a6de2010-10-05 23:30:19 +04001333 struct svc_sock *svsk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334
1335 spin_lock_bh(&serv->sv_lock);
Pavel Emelyanov8f3a6de2010-10-05 23:30:19 +04001336 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
Tom Tucker02fc6c32007-12-30 21:07:48 -06001337 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 spin_unlock_bh(&serv->sv_lock);
1339}
Trond Myklebust24c37672008-12-23 16:30:12 -05001340EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341
1342/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 * Initialize socket for RPC use and create svc_sock struct
1344 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1345 */
Chuck Lever6b174332007-02-12 00:53:28 -08001346static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1347 struct socket *sock,
J. Bruce Fields72c35372012-08-13 17:46:17 -04001348 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349{
1350 struct svc_sock *svsk;
1351 struct sock *inet;
Chuck Lever6b174332007-02-12 00:53:28 -08001352 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
J. Bruce Fields72c35372012-08-13 17:46:17 -04001353 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354
1355 dprintk("svc: svc_setup_socket %p\n", sock);
J. Bruce Fields72c35372012-08-13 17:46:17 -04001356 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1357 if (!svsk)
1358 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359
1360 inet = sock->sk;
1361
1362 /* Register socket with portmapper */
J. Bruce Fields72c35372012-08-13 17:46:17 -04001363 if (pmap_register)
1364 err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +04001365 inet->sk_protocol,
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001366 ntohs(inet_sk(inet)->inet_sport));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367
J. Bruce Fields72c35372012-08-13 17:46:17 -04001368 if (err < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 kfree(svsk);
J. Bruce Fields72c35372012-08-13 17:46:17 -04001370 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 }
1372
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 inet->sk_user_data = svsk;
1374 svsk->sk_sock = sock;
1375 svsk->sk_sk = inet;
1376 svsk->sk_ostate = inet->sk_state_change;
1377 svsk->sk_odata = inet->sk_data_ready;
1378 svsk->sk_owspace = inet->sk_write_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379
1380 /* Initialize the socket */
1381 if (sock->type == SOCK_DGRAM)
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001382 svc_udp_init(svsk, serv);
Olga Kornievskaia96604392008-10-21 14:13:47 -04001383 else {
1384 /* initialise setting must have enough space to
1385 * receive and respond to one request.
1386 */
1387 svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg,
1388 4 * serv->sv_max_mesg);
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001389 svc_tcp_init(svsk, serv);
Olga Kornievskaia96604392008-10-21 14:13:47 -04001390 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1393 svsk, svsk->sk_sk);
1394
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 return svsk;
1396}
1397
Chuck Leverbfba9ab2009-04-23 19:32:33 -04001398/**
1399 * svc_addsock - add a listener socket to an RPC service
1400 * @serv: pointer to RPC service to which to add a new listener
1401 * @fd: file descriptor of the new listener
1402 * @name_return: pointer to buffer to fill in with name of listener
1403 * @len: size of the buffer
1404 *
1405 * Fills in socket name and returns positive length of name if successful.
1406 * Name is terminated with '\n'. On error, returns a negative errno
1407 * value.
1408 */
1409int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1410 const size_t len)
NeilBrownb41b66d2006-10-02 02:17:48 -07001411{
1412 int err = 0;
1413 struct socket *so = sockfd_lookup(fd, &err);
1414 struct svc_sock *svsk = NULL;
J. Bruce Fieldsa8e10072012-08-13 18:01:03 -04001415 struct sockaddr_storage addr;
1416 struct sockaddr *sin = (struct sockaddr *)&addr;
1417 int salen;
NeilBrownb41b66d2006-10-02 02:17:48 -07001418
1419 if (!so)
1420 return err;
J. Bruce Fieldsa8e10072012-08-13 18:01:03 -04001421 err = -EAFNOSUPPORT;
Aime Le Rouzic205ba422010-01-26 14:03:56 -05001422 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
J. Bruce Fieldsa8e10072012-08-13 18:01:03 -04001423 goto out;
1424 err = -EPROTONOSUPPORT;
1425 if (so->sk->sk_protocol != IPPROTO_TCP &&
NeilBrownb41b66d2006-10-02 02:17:48 -07001426 so->sk->sk_protocol != IPPROTO_UDP)
J. Bruce Fieldsa8e10072012-08-13 18:01:03 -04001427 goto out;
1428 err = -EISCONN;
1429 if (so->state > SS_UNCONNECTED)
1430 goto out;
1431 err = -ENOENT;
1432 if (!try_module_get(THIS_MODULE))
1433 goto out;
1434 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
1435 if (IS_ERR(svsk)) {
1436 module_put(THIS_MODULE);
1437 err = PTR_ERR(svsk);
1438 goto out;
NeilBrownb41b66d2006-10-02 02:17:48 -07001439 }
J. Bruce Fieldsa8e10072012-08-13 18:01:03 -04001440 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1441 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
J. Bruce Fields39b55302012-08-14 15:50:34 -04001442 svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
Chuck Levere7942b92009-04-23 19:32:48 -04001443 return svc_one_sock_name(svsk, name_return, len);
J. Bruce Fieldsa8e10072012-08-13 18:01:03 -04001444out:
1445 sockfd_put(so);
1446 return err;
NeilBrownb41b66d2006-10-02 02:17:48 -07001447}
1448EXPORT_SYMBOL_GPL(svc_addsock);
1449
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450/*
1451 * Create socket for RPC service.
1452 */
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001453static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1454 int protocol,
Pavel Emelyanov62832c02010-09-29 16:04:18 +04001455 struct net *net,
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001456 struct sockaddr *sin, int len,
1457 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458{
1459 struct svc_sock *svsk;
1460 struct socket *sock;
1461 int error;
1462 int type;
Tom Tucker9dbc2402007-12-30 21:08:12 -06001463 struct sockaddr_storage addr;
1464 struct sockaddr *newsin = (struct sockaddr *)&addr;
1465 int newlen;
Trond Myklebustc69da772009-03-30 18:59:17 -04001466 int family;
1467 int val;
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +03001468 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469
Chuck Leverad06e4b2007-02-12 00:53:32 -08001470 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1471 serv->sv_program->pg_name, protocol,
Chuck Lever77f1f672007-02-12 00:53:39 -08001472 __svc_print_addr(sin, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473
1474 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1475 printk(KERN_WARNING "svc: only UDP and TCP "
1476 "sockets supported\n");
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001477 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479
Trond Myklebustc69da772009-03-30 18:59:17 -04001480 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1481 switch (sin->sa_family) {
1482 case AF_INET6:
1483 family = PF_INET6;
1484 break;
1485 case AF_INET:
1486 family = PF_INET;
1487 break;
1488 default:
1489 return ERR_PTR(-EINVAL);
1490 }
1491
Pavel Emelyanov14ec63c2010-09-29 16:06:57 +04001492 error = __sock_create(net, family, type, protocol, &sock, 1);
Chuck Lever77f1f672007-02-12 00:53:39 -08001493 if (error < 0)
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001494 return ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495
Peter Zijlstraed075362006-12-06 20:35:24 -08001496 svc_reclassify_socket(sock);
1497
Trond Myklebustc69da772009-03-30 18:59:17 -04001498 /*
1499 * If this is an PF_INET6 listener, we want to avoid
1500 * getting requests from IPv4 remotes. Those should
1501 * be shunted to a PF_INET listener via rpcbind.
1502 */
1503 val = 1;
1504 if (family == PF_INET6)
1505 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1506 (char *)&val, sizeof(val));
1507
Eric Sesterhenn18114742006-09-28 14:37:07 -07001508 if (type == SOCK_STREAM)
Pavel Emelyanov4a17fd52012-04-19 03:39:36 +00001509 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
Chuck Lever77f1f672007-02-12 00:53:39 -08001510 error = kernel_bind(sock, sin, len);
Eric Sesterhenn18114742006-09-28 14:37:07 -07001511 if (error < 0)
1512 goto bummer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513
Tom Tucker9dbc2402007-12-30 21:08:12 -06001514 newlen = len;
1515 error = kernel_getsockname(sock, newsin, &newlen);
1516 if (error < 0)
1517 goto bummer;
1518
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 if (protocol == IPPROTO_TCP) {
Sridhar Samudralae6242e92006-08-07 20:58:01 -07001520 if ((error = kernel_listen(sock, 64)) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 goto bummer;
1522 }
1523
J. Bruce Fields72c35372012-08-13 17:46:17 -04001524 svsk = svc_setup_socket(serv, sock, flags);
J. Bruce Fieldsa8e10072012-08-13 18:01:03 -04001525 if (IS_ERR(svsk)) {
1526 error = PTR_ERR(svsk);
1527 goto bummer;
NeilBrowne79eff12007-02-12 00:53:30 -08001528 }
J. Bruce Fieldsa8e10072012-08-13 18:01:03 -04001529 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1530 return (struct svc_xprt *)svsk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531bummer:
1532 dprintk("svc: svc_create_socket error = %d\n", -error);
1533 sock_release(sock);
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001534 return ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535}
1536
1537/*
Tom Tucker755ccea2007-12-30 21:07:27 -06001538 * Detach the svc_sock from the socket so that no
1539 * more callbacks occur.
1540 */
1541static void svc_sock_detach(struct svc_xprt *xprt)
1542{
1543 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1544 struct sock *sk = svsk->sk_sk;
Eric Dumazeteaefd112011-02-18 03:26:36 +00001545 wait_queue_head_t *wq;
Tom Tucker755ccea2007-12-30 21:07:27 -06001546
1547 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1548
1549 /* put back the old socket callbacks */
1550 sk->sk_state_change = svsk->sk_ostate;
1551 sk->sk_data_ready = svsk->sk_odata;
1552 sk->sk_write_space = svsk->sk_owspace;
Trond Myklebust69b6ba32008-12-23 16:30:11 -05001553
Eric Dumazeteaefd112011-02-18 03:26:36 +00001554 wq = sk_sleep(sk);
1555 if (wq && waitqueue_active(wq))
1556 wake_up_interruptible(wq);
Trond Myklebust69b6ba32008-12-23 16:30:11 -05001557}
1558
1559/*
1560 * Disconnect the socket, and reset the callbacks
1561 */
1562static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1563{
1564 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1565
1566 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1567
1568 svc_sock_detach(xprt);
1569
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001570 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1571 svc_tcp_clear_pages(svsk);
Trond Myklebust69b6ba32008-12-23 16:30:11 -05001572 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001573 }
Tom Tucker755ccea2007-12-30 21:07:27 -06001574}
1575
1576/*
1577 * Free the svc_sock's socket resources and the svc_sock itself.
1578 */
1579static void svc_sock_free(struct svc_xprt *xprt)
1580{
1581 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1582 dprintk("svc: svc_sock_free(%p)\n", svsk);
1583
Tom Tucker755ccea2007-12-30 21:07:27 -06001584 if (svsk->sk_sock->file)
1585 sockfd_put(svsk->sk_sock);
1586 else
1587 sock_release(svsk->sk_sock);
1588 kfree(svsk);
1589}
Benny Halevy7652e5a2009-04-01 09:23:09 -04001590
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001591#if defined(CONFIG_SUNRPC_BACKCHANNEL)
Benny Halevy7652e5a2009-04-01 09:23:09 -04001592/*
Andy Adamson1f11a032011-01-06 02:04:26 +00001593 * Create a back channel svc_xprt which shares the fore channel socket.
Benny Halevy7652e5a2009-04-01 09:23:09 -04001594 */
Andy Adamson1f11a032011-01-06 02:04:26 +00001595static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
1596 int protocol,
1597 struct net *net,
1598 struct sockaddr *sin, int len,
1599 int flags)
Benny Halevy7652e5a2009-04-01 09:23:09 -04001600{
1601 struct svc_sock *svsk;
Andy Adamson1f11a032011-01-06 02:04:26 +00001602 struct svc_xprt *xprt;
Benny Halevy7652e5a2009-04-01 09:23:09 -04001603
Andy Adamson1f11a032011-01-06 02:04:26 +00001604 if (protocol != IPPROTO_TCP) {
1605 printk(KERN_WARNING "svc: only TCP sockets"
1606 " supported on shared back channel\n");
1607 return ERR_PTR(-EINVAL);
1608 }
1609
Benny Halevy7652e5a2009-04-01 09:23:09 -04001610 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1611 if (!svsk)
Andy Adamson1f11a032011-01-06 02:04:26 +00001612 return ERR_PTR(-ENOMEM);
Benny Halevy7652e5a2009-04-01 09:23:09 -04001613
1614 xprt = &svsk->sk_xprt;
Stanislav Kinsburskybd4620d2011-12-06 14:19:10 +03001615 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
Andy Adamson1f11a032011-01-06 02:04:26 +00001616
Andy Adamson4a19de02011-01-06 02:04:35 +00001617 serv->sv_bc_xprt = xprt;
Andy Adamson1f11a032011-01-06 02:04:26 +00001618
Benny Halevy7652e5a2009-04-01 09:23:09 -04001619 return xprt;
1620}
Benny Halevy7652e5a2009-04-01 09:23:09 -04001621
1622/*
Andy Adamson1f11a032011-01-06 02:04:26 +00001623 * Free a back channel svc_sock.
Benny Halevy7652e5a2009-04-01 09:23:09 -04001624 */
Andy Adamson1f11a032011-01-06 02:04:26 +00001625static void svc_bc_sock_free(struct svc_xprt *xprt)
Benny Halevy7652e5a2009-04-01 09:23:09 -04001626{
Andy Adamson778be232011-01-25 15:38:01 +00001627 if (xprt)
Benny Halevy7652e5a2009-04-01 09:23:09 -04001628 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1629}
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001630#endif /* CONFIG_SUNRPC_BACKCHANNEL */