blob: 18bc130255a75e537f87d15bddde82faf165d91e [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 *,
Chuck Lever6b174332007-02-12 00:53:28 -080062 int *errp, 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;
John Heffner02b3d342007-09-12 10:42:12 +020087 BUG_ON(sock_owned_by_user(sk));
Peter Zijlstraed075362006-12-06 20:35:24 -080088 switch (sk->sk_family) {
89 case AF_INET:
90 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
Tom Tuckerdef13d72007-12-30 21:08:08 -060091 &svc_slock_key[0],
92 "sk_xprt.xpt_lock-AF_INET-NFSD",
93 &svc_key[0]);
Peter Zijlstraed075362006-12-06 20:35:24 -080094 break;
95
96 case AF_INET6:
97 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
Tom Tuckerdef13d72007-12-30 21:08:08 -060098 &svc_slock_key[1],
99 "sk_xprt.xpt_lock-AF_INET6-NFSD",
100 &svc_key[1]);
Peter Zijlstraed075362006-12-06 20:35:24 -0800101 break;
102
103 default:
104 BUG();
105 }
106}
107#else
Tom Tucker0f0257e2007-12-30 21:08:27 -0600108static void svc_reclassify_socket(struct socket *sock)
Peter Zijlstraed075362006-12-06 20:35:24 -0800109{
110}
111#endif
112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113/*
114 * Release an skbuff after use
115 */
Tom Tucker5148bf42007-12-30 21:07:25 -0600116static void svc_release_skb(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117{
Tom Tucker5148bf42007-12-30 21:07:25 -0600118 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120 if (skb) {
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600121 struct svc_sock *svsk =
122 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Tom Tucker5148bf42007-12-30 21:07:25 -0600123 rqstp->rq_xprt_ctxt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
Eric Dumazet9d410c72009-10-30 05:03:53 +0000126 skb_free_datagram_locked(svsk->sk_sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128}
129
Chuck Leverb92503b2007-02-12 00:53:36 -0800130union svc_pktinfo_u {
131 struct in_pktinfo pkti;
Chuck Leverb92503b2007-02-12 00:53:36 -0800132 struct in6_pktinfo pkti6;
Chuck Leverb92503b2007-02-12 00:53:36 -0800133};
David S. Millerbc375ea2007-04-12 13:35:59 -0700134#define SVC_PKTINFO_SPACE \
135 CMSG_SPACE(sizeof(union svc_pktinfo_u))
Chuck Leverb92503b2007-02-12 00:53:36 -0800136
137static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
138{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600139 struct svc_sock *svsk =
140 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
141 switch (svsk->sk_sk->sk_family) {
Chuck Leverb92503b2007-02-12 00:53:36 -0800142 case AF_INET: {
143 struct in_pktinfo *pki = CMSG_DATA(cmh);
144
145 cmh->cmsg_level = SOL_IP;
146 cmh->cmsg_type = IP_PKTINFO;
147 pki->ipi_ifindex = 0;
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800148 pki->ipi_spec_dst.s_addr =
149 svc_daddr_in(rqstp)->sin_addr.s_addr;
Chuck Leverb92503b2007-02-12 00:53:36 -0800150 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
151 }
152 break;
NeilBrown5a05ed72007-03-06 01:42:22 -0800153
Chuck Leverb92503b2007-02-12 00:53:36 -0800154 case AF_INET6: {
155 struct in6_pktinfo *pki = CMSG_DATA(cmh);
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800156 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
Chuck Leverb92503b2007-02-12 00:53:36 -0800157
158 cmh->cmsg_level = SOL_IPV6;
159 cmh->cmsg_type = IPV6_PKTINFO;
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800160 pki->ipi6_ifindex = daddr->sin6_scope_id;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000161 pki->ipi6_addr = daddr->sin6_addr;
Chuck Leverb92503b2007-02-12 00:53:36 -0800162 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
163 }
164 break;
Chuck Leverb92503b2007-02-12 00:53:36 -0800165 }
Chuck Leverb92503b2007-02-12 00:53:36 -0800166}
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168/*
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300169 * send routine intended to be shared by the fore- and back-channel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 */
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300171int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
172 struct page *headpage, unsigned long headoffset,
173 struct page *tailpage, unsigned long tailoffset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 int result;
176 int size;
177 struct page **ppage = xdr->pages;
178 size_t base = xdr->page_base;
179 unsigned int pglen = xdr->page_len;
180 unsigned int flags = MSG_MORE;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300181 int slen;
182 int len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184 slen = xdr->len;
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 /* send head */
187 if (slen == xdr->head[0].iov_len)
188 flags = 0;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300189 len = kernel_sendpage(sock, headpage, headoffset,
NeilBrown44524352006-10-04 02:15:46 -0700190 xdr->head[0].iov_len, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 if (len != xdr->head[0].iov_len)
192 goto out;
193 slen -= xdr->head[0].iov_len;
194 if (slen == 0)
195 goto out;
196
197 /* send page data */
198 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
199 while (pglen > 0) {
200 if (slen == size)
201 flags = 0;
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700202 result = kernel_sendpage(sock, *ppage, base, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (result > 0)
204 len += result;
205 if (result != size)
206 goto out;
207 slen -= size;
208 pglen -= size;
209 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
210 base = 0;
211 ppage++;
212 }
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 /* send tail */
215 if (xdr->tail[0].iov_len) {
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300216 result = kernel_sendpage(sock, tailpage, tailoffset,
217 xdr->tail[0].iov_len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 if (result > 0)
219 len += result;
220 }
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300221
222out:
223 return len;
224}
225
226
227/*
228 * Generic sendto routine
229 */
230static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
231{
232 struct svc_sock *svsk =
233 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
234 struct socket *sock = svsk->sk_sock;
235 union {
236 struct cmsghdr hdr;
237 long all[SVC_PKTINFO_SPACE / sizeof(long)];
238 } buffer;
239 struct cmsghdr *cmh = &buffer.hdr;
240 int len = 0;
241 unsigned long tailoff;
242 unsigned long headoff;
243 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
244
245 if (rqstp->rq_prot == IPPROTO_UDP) {
246 struct msghdr msg = {
247 .msg_name = &rqstp->rq_addr,
248 .msg_namelen = rqstp->rq_addrlen,
249 .msg_control = cmh,
250 .msg_controllen = sizeof(buffer),
251 .msg_flags = MSG_MORE,
252 };
253
254 svc_set_cmsg_data(rqstp, cmh);
255
256 if (sock_sendmsg(sock, &msg, 0) < 0)
257 goto out;
258 }
259
260 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
261 headoff = 0;
262 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
263 rqstp->rq_respages[0], tailoff);
264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265out:
Chuck Leverad06e4b2007-02-12 00:53:32 -0800266 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600267 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
Chuck Leverad06e4b2007-02-12 00:53:32 -0800268 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
270 return len;
271}
272
273/*
NeilBrown80212d52006-10-02 02:17:47 -0700274 * Report socket names for nfsdfs
275 */
Chuck Levere7942b92009-04-23 19:32:48 -0400276static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
NeilBrown80212d52006-10-02 02:17:47 -0700277{
Chuck Lever017cb472009-04-23 19:33:03 -0400278 const struct sock *sk = svsk->sk_sk;
279 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
280 "udp" : "tcp";
NeilBrown80212d52006-10-02 02:17:47 -0700281 int len;
282
Chuck Lever017cb472009-04-23 19:33:03 -0400283 switch (sk->sk_family) {
Chuck Levere7942b92009-04-23 19:32:48 -0400284 case PF_INET:
285 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
Chuck Lever017cb472009-04-23 19:33:03 -0400286 proto_name,
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000287 &inet_sk(sk)->inet_rcv_saddr,
288 inet_sk(sk)->inet_num);
NeilBrown80212d52006-10-02 02:17:47 -0700289 break;
Chuck Lever58de2f82009-04-23 19:32:55 -0400290 case PF_INET6:
291 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
Chuck Lever017cb472009-04-23 19:33:03 -0400292 proto_name,
293 &inet6_sk(sk)->rcv_saddr,
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000294 inet_sk(sk)->inet_num);
NeilBrown80212d52006-10-02 02:17:47 -0700295 break;
296 default:
Chuck Levere7942b92009-04-23 19:32:48 -0400297 len = snprintf(buf, remaining, "*unknown-%d*\n",
Chuck Lever017cb472009-04-23 19:33:03 -0400298 sk->sk_family);
NeilBrown80212d52006-10-02 02:17:47 -0700299 }
Chuck Levere7942b92009-04-23 19:32:48 -0400300
301 if (len >= remaining) {
302 *buf = '\0';
303 return -ENAMETOOLONG;
NeilBrown80212d52006-10-02 02:17:47 -0700304 }
305 return len;
306}
307
Chuck Lever8435d342009-04-23 19:32:40 -0400308/**
309 * svc_sock_names - construct a list of listener names in a string
310 * @serv: pointer to RPC service
311 * @buf: pointer to a buffer to fill in with socket names
312 * @buflen: size of the buffer to be filled
313 * @toclose: pointer to '\0'-terminated C string containing the name
314 * of a listener to be closed
315 *
316 * Fills in @buf with a '\n'-separated list of names of listener
317 * sockets. If @toclose is not NULL, the socket named by @toclose
318 * is closed, and is not included in the output list.
319 *
320 * Returns positive length of the socket name string, or a negative
321 * errno value on error.
322 */
323int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen,
324 const char *toclose)
NeilBrown80212d52006-10-02 02:17:47 -0700325{
NeilBrownb41b66d2006-10-02 02:17:48 -0700326 struct svc_sock *svsk, *closesk = NULL;
NeilBrown80212d52006-10-02 02:17:47 -0700327 int len = 0;
328
329 if (!serv)
330 return 0;
Chuck Levere7942b92009-04-23 19:32:48 -0400331
NeilBrownaaf68cf2007-02-08 14:20:30 -0800332 spin_lock_bh(&serv->sv_lock);
Tom Tucker7a182082007-12-30 21:07:53 -0600333 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
Chuck Levere7942b92009-04-23 19:32:48 -0400334 int onelen = svc_one_sock_name(svsk, buf + len, buflen - len);
335 if (onelen < 0) {
336 len = onelen;
337 break;
338 }
NeilBrown39423022010-11-15 11:27:01 +1100339 if (toclose && strcmp(toclose, buf + len) == 0) {
NeilBrownb41b66d2006-10-02 02:17:48 -0700340 closesk = svsk;
NeilBrown39423022010-11-15 11:27:01 +1100341 svc_xprt_get(&closesk->sk_xprt);
342 } else
NeilBrownb41b66d2006-10-02 02:17:48 -0700343 len += onelen;
NeilBrown80212d52006-10-02 02:17:47 -0700344 }
NeilBrownaaf68cf2007-02-08 14:20:30 -0800345 spin_unlock_bh(&serv->sv_lock);
Chuck Levere7942b92009-04-23 19:32:48 -0400346
NeilBrown39423022010-11-15 11:27:01 +1100347 if (closesk) {
NeilBrown5680c442006-10-04 02:15:45 -0700348 /* Should unregister with portmap, but you cannot
349 * unregister just one protocol...
350 */
Tom Tucker7a182082007-12-30 21:07:53 -0600351 svc_close_xprt(&closesk->sk_xprt);
NeilBrown39423022010-11-15 11:27:01 +1100352 svc_xprt_put(&closesk->sk_xprt);
353 } else if (toclose)
NeilBrown37a03472006-10-04 02:15:44 -0700354 return -ENOENT;
NeilBrown80212d52006-10-02 02:17:47 -0700355 return len;
356}
Trond Myklebust24c37672008-12-23 16:30:12 -0500357EXPORT_SYMBOL_GPL(svc_sock_names);
NeilBrown80212d52006-10-02 02:17:47 -0700358
359/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 * Check input queue length
361 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600362static int svc_recv_available(struct svc_sock *svsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 struct socket *sock = svsk->sk_sock;
365 int avail, err;
366
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700367 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
369 return (err >= 0)? avail : err;
370}
371
372/*
373 * Generic recvfrom routine.
374 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600375static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
376 int buflen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600378 struct svc_sock *svsk =
379 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Chuck Lever1ba95102007-02-12 00:53:31 -0800380 struct msghdr msg = {
381 .msg_flags = MSG_DONTWAIT,
382 };
383 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
Tom Tucker260c1d12007-12-30 21:08:29 -0600385 rqstp->rq_xprt_hlen = 0;
386
Chuck Lever1ba95102007-02-12 00:53:31 -0800387 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
388 msg.msg_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
Chuck Lever1ba95102007-02-12 00:53:31 -0800391 svsk, iov[0].iov_base, iov[0].iov_len, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 return len;
393}
394
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800395static int svc_partial_recvfrom(struct svc_rqst *rqstp,
396 struct kvec *iov, int nr,
397 int buflen, unsigned int base)
398{
399 size_t save_iovlen;
Trond Myklebust09acfea2012-03-11 15:22:54 -0400400 void *save_iovbase;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800401 unsigned int i;
402 int ret;
403
404 if (base == 0)
405 return svc_recvfrom(rqstp, iov, nr, buflen);
406
407 for (i = 0; i < nr; i++) {
408 if (iov[i].iov_len > base)
409 break;
410 base -= iov[i].iov_len;
411 }
412 save_iovlen = iov[i].iov_len;
413 save_iovbase = iov[i].iov_base;
414 iov[i].iov_len -= base;
415 iov[i].iov_base += base;
416 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
417 iov[i].iov_len = save_iovlen;
418 iov[i].iov_base = save_iovbase;
419 return ret;
420}
421
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422/*
423 * Set socket snd and rcv buffer lengths
424 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600425static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
426 unsigned int rcv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427{
428#if 0
429 mm_segment_t oldfs;
430 oldfs = get_fs(); set_fs(KERNEL_DS);
431 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
432 (char*)&snd, sizeof(snd));
433 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
434 (char*)&rcv, sizeof(rcv));
435#else
436 /* sock_setsockopt limits use to sysctl_?mem_max,
437 * which isn't acceptable. Until that is made conditional
438 * on not having CAP_SYS_RESOURCE or similar, we go direct...
439 * DaveM said I could!
440 */
441 lock_sock(sock->sk);
442 sock->sk->sk_sndbuf = snd * 2;
443 sock->sk->sk_rcvbuf = rcv * 2;
Trond Myklebust47fcb032009-05-18 17:47:56 -0400444 sock->sk->sk_write_space(sock->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 release_sock(sock->sk);
446#endif
447}
448/*
449 * INET callback when data has been received on the socket.
450 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600451static void svc_udp_data_ready(struct sock *sk, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452{
Neil Brown939bb7e2005-09-13 01:25:39 -0700453 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000454 wait_queue_head_t *wq = sk_sleep(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
Neil Brown939bb7e2005-09-13 01:25:39 -0700456 if (svsk) {
457 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
Tom Tucker02fc6c32007-12-30 21:07:48 -0600458 svsk, sk, count,
459 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
460 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600461 svc_xprt_enqueue(&svsk->sk_xprt);
Neil Brown939bb7e2005-09-13 01:25:39 -0700462 }
Eric Dumazeteaefd112011-02-18 03:26:36 +0000463 if (wq && waitqueue_active(wq))
464 wake_up_interruptible(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465}
466
467/*
468 * INET callback when space is newly available on the socket.
469 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600470static void svc_write_space(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
472 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
Eric Dumazeteaefd112011-02-18 03:26:36 +0000473 wait_queue_head_t *wq = sk_sleep(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475 if (svsk) {
476 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
Tom Tucker02fc6c32007-12-30 21:07:48 -0600477 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
Tom Tuckerf6150c32007-12-30 21:07:57 -0600478 svc_xprt_enqueue(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 }
480
Eric Dumazeteaefd112011-02-18 03:26:36 +0000481 if (wq && waitqueue_active(wq)) {
Neil Brown939bb7e2005-09-13 01:25:39 -0700482 dprintk("RPC svc_write_space: someone sleeping on %p\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 svsk);
Eric Dumazeteaefd112011-02-18 03:26:36 +0000484 wake_up_interruptible(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 }
486}
487
Trond Myklebust47fcb032009-05-18 17:47:56 -0400488static void svc_tcp_write_space(struct sock *sk)
489{
490 struct socket *sock = sk->sk_socket;
491
492 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock)
493 clear_bit(SOCK_NOSPACE, &sock->flags);
494 svc_write_space(sk);
495}
496
Tom Tucker9dbc2402007-12-30 21:08:12 -0600497/*
Chuck Lever7702ce42009-07-13 10:54:26 -0400498 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
499 */
500static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
501 struct cmsghdr *cmh)
502{
503 struct in_pktinfo *pki = CMSG_DATA(cmh);
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800504 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
505
Chuck Lever7702ce42009-07-13 10:54:26 -0400506 if (cmh->cmsg_type != IP_PKTINFO)
507 return 0;
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800508
509 daddr->sin_family = AF_INET;
510 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
Chuck Lever7702ce42009-07-13 10:54:26 -0400511 return 1;
512}
513
514/*
515 * See net/ipv6/datagram.c : datagram_recv_ctl
516 */
517static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
518 struct cmsghdr *cmh)
519{
520 struct in6_pktinfo *pki = CMSG_DATA(cmh);
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800521 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
522
Chuck Lever7702ce42009-07-13 10:54:26 -0400523 if (cmh->cmsg_type != IPV6_PKTINFO)
524 return 0;
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800525
526 daddr->sin6_family = AF_INET6;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000527 daddr->sin6_addr = pki->ipi6_addr;
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800528 daddr->sin6_scope_id = pki->ipi6_ifindex;
Chuck Lever7702ce42009-07-13 10:54:26 -0400529 return 1;
530}
531
532/*
Tom Tucker9dbc2402007-12-30 21:08:12 -0600533 * Copy the UDP datagram's destination address to the rqstp structure.
534 * The 'destination' address in this case is the address to which the
535 * peer sent the datagram, i.e. our local address. For multihomed
536 * hosts, this can change from msg to msg. Note that only the IP
537 * address changes, the port number should remain the same.
538 */
Chuck Lever7702ce42009-07-13 10:54:26 -0400539static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
540 struct cmsghdr *cmh)
Chuck Lever95756482007-02-12 00:53:38 -0800541{
Chuck Lever7702ce42009-07-13 10:54:26 -0400542 switch (cmh->cmsg_level) {
543 case SOL_IP:
544 return svc_udp_get_dest_address4(rqstp, cmh);
545 case SOL_IPV6:
546 return svc_udp_get_dest_address6(rqstp, cmh);
Chuck Lever95756482007-02-12 00:53:38 -0800547 }
Chuck Lever7702ce42009-07-13 10:54:26 -0400548
549 return 0;
Chuck Lever95756482007-02-12 00:53:38 -0800550}
551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552/*
553 * Receive a datagram from a UDP socket.
554 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600555static int svc_udp_recvfrom(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600557 struct svc_sock *svsk =
558 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600559 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 struct sk_buff *skb;
David S. Millerbc375ea2007-04-12 13:35:59 -0700561 union {
562 struct cmsghdr hdr;
563 long all[SVC_PKTINFO_SPACE / sizeof(long)];
564 } buffer;
565 struct cmsghdr *cmh = &buffer.hdr;
NeilBrown7a37f572007-03-06 01:42:21 -0800566 struct msghdr msg = {
567 .msg_name = svc_addr(rqstp),
568 .msg_control = cmh,
569 .msg_controllen = sizeof(buffer),
570 .msg_flags = MSG_DONTWAIT,
571 };
Chuck Leverabc5c442009-04-23 19:31:25 -0400572 size_t len;
573 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
Tom Tucker02fc6c32007-12-30 21:07:48 -0600575 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 /* udp sockets need large rcvbuf as all pending
577 * requests are still in that buffer. sndbuf must
578 * also be large enough that there is enough space
Greg Banks3262c812006-10-02 02:17:58 -0700579 * for one reply per thread. We count all threads
580 * rather than threads in a particular pool, which
581 * provides an upper bound on the number of threads
582 * which will access the socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 */
584 svc_sock_setbufsize(svsk->sk_sock,
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700585 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
586 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
Tom Tucker02fc6c32007-12-30 21:07:48 -0600588 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
NeilBrown05ed6902007-05-09 02:34:55 -0700589 skb = NULL;
590 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
591 0, 0, MSG_PEEK | MSG_DONTWAIT);
592 if (err >= 0)
593 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
594
595 if (skb == NULL) {
596 if (err != -EAGAIN) {
597 /* possibly an icmp error */
598 dprintk("svc: recvfrom returned error %d\n", -err);
Tom Tucker02fc6c32007-12-30 21:07:48 -0600599 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 }
NeilBrown05ed6902007-05-09 02:34:55 -0700601 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 }
Tom Tucker9dbc2402007-12-30 21:08:12 -0600603 len = svc_addr_len(svc_addr(rqstp));
Chuck Leverabc5c442009-04-23 19:31:25 -0400604 if (len == 0)
605 return -EAFNOSUPPORT;
Tom Tucker9dbc2402007-12-30 21:08:12 -0600606 rqstp->rq_addrlen = len;
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700607 if (skb->tstamp.tv64 == 0) {
608 skb->tstamp = ktime_get_real();
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800609 /* Don't enable netstamp, sunrpc doesn't
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 need that much accuracy */
611 }
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700612 svsk->sk_sk->sk_stamp = skb->tstamp;
Tom Tucker02fc6c32007-12-30 21:07:48 -0600613 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 len = skb->len - sizeof(struct udphdr);
616 rqstp->rq_arg.len = len;
617
Chuck Lever95756482007-02-12 00:53:38 -0800618 rqstp->rq_prot = IPPROTO_UDP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Chuck Lever7702ce42009-07-13 10:54:26 -0400620 if (!svc_udp_get_dest_address(rqstp, cmh)) {
Joe Perchese87cc472012-05-13 21:56:26 +0000621 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
622 cmh->cmsg_level, cmh->cmsg_type);
Eric Dumazet22911fc2012-06-27 00:23:44 +0000623out_free:
624 trace_kfree_skb(skb, svc_udp_recvfrom);
Eric Dumazet9d410c72009-10-30 05:03:53 +0000625 skb_free_datagram_locked(svsk->sk_sk, skb);
NeilBrown7a37f572007-03-06 01:42:21 -0800626 return 0;
627 }
Mi Jinlong849a1cf2011-08-30 17:18:41 +0800628 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
630 if (skb_is_nonlinear(skb)) {
631 /* we have to copy */
632 local_bh_disable();
633 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
634 local_bh_enable();
635 /* checksum error */
Eric Dumazet22911fc2012-06-27 00:23:44 +0000636 goto out_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 }
638 local_bh_enable();
Eric Dumazet9d410c72009-10-30 05:03:53 +0000639 skb_free_datagram_locked(svsk->sk_sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 } else {
641 /* we can use it in-place */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600642 rqstp->rq_arg.head[0].iov_base = skb->data +
643 sizeof(struct udphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 rqstp->rq_arg.head[0].iov_len = len;
Eric Dumazet22911fc2012-06-27 00:23:44 +0000645 if (skb_checksum_complete(skb))
646 goto out_free;
Tom Tucker5148bf42007-12-30 21:07:25 -0600647 rqstp->rq_xprt_ctxt = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 }
649
650 rqstp->rq_arg.page_base = 0;
651 if (len <= rqstp->rq_arg.head[0].iov_len) {
652 rqstp->rq_arg.head[0].iov_len = len;
653 rqstp->rq_arg.page_len = 0;
NeilBrown44524352006-10-04 02:15:46 -0700654 rqstp->rq_respages = rqstp->rq_pages+1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 } else {
656 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
NeilBrown44524352006-10-04 02:15:46 -0700657 rqstp->rq_respages = rqstp->rq_pages + 1 +
Ilpo Järvinen172589c2007-08-28 15:50:33 -0700658 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 }
660
661 if (serv->sv_stats)
662 serv->sv_stats->netudpcnt++;
663
664 return len;
665}
666
667static int
668svc_udp_sendto(struct svc_rqst *rqstp)
669{
670 int error;
671
672 error = svc_sendto(rqstp, &rqstp->rq_res);
673 if (error == -ECONNREFUSED)
674 /* ICMP error on earlier request. */
675 error = svc_sendto(rqstp, &rqstp->rq_res);
676
677 return error;
678}
679
Tom Tuckere831fe62007-12-30 21:07:29 -0600680static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
681{
682}
683
Tom Tucker323bee32007-12-30 21:07:31 -0600684static int svc_udp_has_wspace(struct svc_xprt *xprt)
685{
686 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600687 struct svc_serv *serv = xprt->xpt_server;
Tom Tucker323bee32007-12-30 21:07:31 -0600688 unsigned long required;
689
690 /*
691 * Set the SOCK_NOSPACE flag before checking the available
692 * sock space.
693 */
694 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
Tom Tucker7a90e8c2007-12-30 21:07:55 -0600695 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
Tom Tucker323bee32007-12-30 21:07:31 -0600696 if (required*2 > sock_wspace(svsk->sk_sk))
697 return 0;
698 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
699 return 1;
700}
701
Tom Tucker38a417c2007-12-30 21:07:36 -0600702static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
703{
704 BUG();
705 return NULL;
706}
707
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600708static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
Pavel Emelyanov62832c02010-09-29 16:04:18 +0400709 struct net *net,
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600710 struct sockaddr *sa, int salen,
711 int flags)
712{
Pavel Emelyanov62832c02010-09-29 16:04:18 +0400713 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600714}
715
Tom Tucker360d87382007-12-30 21:07:17 -0600716static struct svc_xprt_ops svc_udp_ops = {
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600717 .xpo_create = svc_udp_create,
Tom Tucker5d137992007-12-30 21:07:23 -0600718 .xpo_recvfrom = svc_udp_recvfrom,
719 .xpo_sendto = svc_udp_sendto,
Tom Tucker5148bf42007-12-30 21:07:25 -0600720 .xpo_release_rqst = svc_release_skb,
Tom Tucker755ccea2007-12-30 21:07:27 -0600721 .xpo_detach = svc_sock_detach,
722 .xpo_free = svc_sock_free,
Tom Tuckere831fe62007-12-30 21:07:29 -0600723 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
Tom Tucker323bee32007-12-30 21:07:31 -0600724 .xpo_has_wspace = svc_udp_has_wspace,
Tom Tucker38a417c2007-12-30 21:07:36 -0600725 .xpo_accept = svc_udp_accept,
Tom Tucker360d87382007-12-30 21:07:17 -0600726};
727
728static struct svc_xprt_class svc_udp_class = {
729 .xcl_name = "udp",
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600730 .xcl_owner = THIS_MODULE,
Tom Tucker360d87382007-12-30 21:07:17 -0600731 .xcl_ops = &svc_udp_ops,
Tom Tucker49023152007-12-30 21:07:21 -0600732 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
Tom Tucker360d87382007-12-30 21:07:17 -0600733};
734
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600735static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736{
Chuck Lever7702ce42009-07-13 10:54:26 -0400737 int err, level, optname, one = 1;
NeilBrown7a37f572007-03-06 01:42:21 -0800738
Stanislav Kinsburskybd4620d2011-12-06 14:19:10 +0300739 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
740 &svsk->sk_xprt, serv);
Tom Tuckerdef13d72007-12-30 21:08:08 -0600741 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
743 svsk->sk_sk->sk_write_space = svc_write_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
745 /* initialise setting must have enough space to
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800746 * receive and respond to one request.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 * svc_udp_recvfrom will re-adjust if necessary
748 */
749 svc_sock_setbufsize(svsk->sk_sock,
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600750 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
751 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
Tom Tucker0f0257e2007-12-30 21:08:27 -0600753 /* data might have come in before data_ready set up */
754 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Tom Tucker02fc6c32007-12-30 21:07:48 -0600755 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
NeilBrown7a37f572007-03-06 01:42:21 -0800756
NeilBrown7a37f572007-03-06 01:42:21 -0800757 /* make sure we get destination address info */
Chuck Lever7702ce42009-07-13 10:54:26 -0400758 switch (svsk->sk_sk->sk_family) {
759 case AF_INET:
760 level = SOL_IP;
761 optname = IP_PKTINFO;
762 break;
763 case AF_INET6:
764 level = SOL_IPV6;
765 optname = IPV6_RECVPKTINFO;
766 break;
767 default:
768 BUG();
769 }
770 err = kernel_setsockopt(svsk->sk_sock, level, optname,
771 (char *)&one, sizeof(one));
772 dprintk("svc: kernel_setsockopt returned %d\n", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773}
774
775/*
776 * A data_ready event on a listening socket means there's a connection
777 * pending. Do not use state_change as a substitute for it.
778 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600779static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780{
Neil Brown939bb7e2005-09-13 01:25:39 -0700781 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000782 wait_queue_head_t *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
784 dprintk("svc: socket %p TCP (listen) state change %d\n",
Neil Brown939bb7e2005-09-13 01:25:39 -0700785 sk, sk->sk_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
Neil Brown939bb7e2005-09-13 01:25:39 -0700787 /*
788 * This callback may called twice when a new connection
789 * is established as a child socket inherits everything
790 * from a parent LISTEN socket.
791 * 1) data_ready method of the parent socket will be called
792 * when one of child sockets become ESTABLISHED.
793 * 2) data_ready method of the child socket may be called
794 * when it receives data before the socket is accepted.
795 * In case of 2, we should ignore it silently.
796 */
797 if (sk->sk_state == TCP_LISTEN) {
798 if (svsk) {
Tom Tucker02fc6c32007-12-30 21:07:48 -0600799 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600800 svc_xprt_enqueue(&svsk->sk_xprt);
Neil Brown939bb7e2005-09-13 01:25:39 -0700801 } else
802 printk("svc: socket %p: no user data\n", sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 }
Neil Brown939bb7e2005-09-13 01:25:39 -0700804
Eric Dumazeteaefd112011-02-18 03:26:36 +0000805 wq = sk_sleep(sk);
806 if (wq && waitqueue_active(wq))
807 wake_up_interruptible_all(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808}
809
810/*
811 * A state change on a connected socket means it's dying or dead.
812 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600813static void svc_tcp_state_change(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814{
Neil Brown939bb7e2005-09-13 01:25:39 -0700815 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000816 wait_queue_head_t *wq = sk_sleep(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
818 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
Neil Brown939bb7e2005-09-13 01:25:39 -0700819 sk, sk->sk_state, sk->sk_user_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
Neil Brown939bb7e2005-09-13 01:25:39 -0700821 if (!svsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 printk("svc: socket %p: no user data\n", sk);
Neil Brown939bb7e2005-09-13 01:25:39 -0700823 else {
Tom Tucker02fc6c32007-12-30 21:07:48 -0600824 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600825 svc_xprt_enqueue(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 }
Eric Dumazeteaefd112011-02-18 03:26:36 +0000827 if (wq && waitqueue_active(wq))
828 wake_up_interruptible_all(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829}
830
Tom Tucker0f0257e2007-12-30 21:08:27 -0600831static void svc_tcp_data_ready(struct sock *sk, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832{
Neil Brown939bb7e2005-09-13 01:25:39 -0700833 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000834 wait_queue_head_t *wq = sk_sleep(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835
836 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
Neil Brown939bb7e2005-09-13 01:25:39 -0700837 sk, sk->sk_user_data);
838 if (svsk) {
Tom Tucker02fc6c32007-12-30 21:07:48 -0600839 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600840 svc_xprt_enqueue(&svsk->sk_xprt);
Neil Brown939bb7e2005-09-13 01:25:39 -0700841 }
Eric Dumazeteaefd112011-02-18 03:26:36 +0000842 if (wq && waitqueue_active(wq))
843 wake_up_interruptible(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844}
845
846/*
847 * Accept a TCP connection
848 */
Tom Tucker38a417c2007-12-30 21:07:36 -0600849static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850{
Tom Tucker38a417c2007-12-30 21:07:36 -0600851 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800852 struct sockaddr_storage addr;
853 struct sockaddr *sin = (struct sockaddr *) &addr;
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600854 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 struct socket *sock = svsk->sk_sock;
856 struct socket *newsock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 struct svc_sock *newsvsk;
858 int err, slen;
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +0300859 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
861 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
862 if (!sock)
Tom Tucker38a417c2007-12-30 21:07:36 -0600863 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
Tom Tucker02fc6c32007-12-30 21:07:48 -0600865 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700866 err = kernel_accept(sock, &newsock, O_NONBLOCK);
867 if (err < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 if (err == -ENOMEM)
869 printk(KERN_WARNING "%s: no more sockets!\n",
870 serv->sv_name);
Joe Perchese87cc472012-05-13 21:56:26 +0000871 else if (err != -EAGAIN)
872 net_warn_ratelimited("%s: accept failed (err %d)!\n",
873 serv->sv_name, -err);
Tom Tucker38a417c2007-12-30 21:07:36 -0600874 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 }
Tom Tucker02fc6c32007-12-30 21:07:48 -0600876 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800878 err = kernel_getpeername(newsock, sin, &slen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 if (err < 0) {
Joe Perchese87cc472012-05-13 21:56:26 +0000880 net_warn_ratelimited("%s: peername failed (err %d)!\n",
881 serv->sv_name, -err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 goto failed; /* aborted connection or whatever */
883 }
884
885 /* Ideally, we would want to reject connections from unauthorized
Chuck Leverad06e4b2007-02-12 00:53:32 -0800886 * hosts here, but when we get encryption, the IP of the host won't
887 * tell us anything. For now just warn about unpriv connections.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 */
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800889 if (!svc_port_is_privileged(sin)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 dprintk(KERN_WARNING
Chuck Leverad06e4b2007-02-12 00:53:32 -0800891 "%s: connect from unprivileged port: %s\n",
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800892 serv->sv_name,
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800893 __svc_print_addr(sin, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 }
Chuck Leverad06e4b2007-02-12 00:53:32 -0800895 dprintk("%s: connect from %s\n", serv->sv_name,
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800896 __svc_print_addr(sin, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
898 /* make sure that a write doesn't block forever when
899 * low on memory
900 */
901 newsock->sk->sk_sndtimeo = HZ*30;
902
Chuck Lever6b174332007-02-12 00:53:28 -0800903 if (!(newsvsk = svc_setup_socket(serv, newsock, &err,
904 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 goto failed;
Tom Tucker9dbc2402007-12-30 21:08:12 -0600906 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
Frank van Maarseveena9747692007-07-09 22:21:39 +0200907 err = kernel_getsockname(newsock, sin, &slen);
908 if (unlikely(err < 0)) {
909 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
910 slen = offsetof(struct sockaddr, sa_data);
911 }
Tom Tucker9dbc2402007-12-30 21:08:12 -0600912 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
Chuck Lever067d7812007-02-12 00:53:30 -0800913
Tom Tuckerf9f3cc42007-12-30 21:07:40 -0600914 if (serv->sv_stats)
915 serv->sv_stats->nettcpconn++;
916
917 return &newsvsk->sk_xprt;
918
919failed:
920 sock_release(newsock);
921 return NULL;
922}
923
J. Bruce Fields31d68ef2011-02-24 11:25:33 -0800924static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
925{
926 unsigned int i, len, npages;
927
928 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
929 return 0;
930 len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
931 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
932 for (i = 0; i < npages; i++) {
933 if (rqstp->rq_pages[i] != NULL)
934 put_page(rqstp->rq_pages[i]);
935 BUG_ON(svsk->sk_pages[i] == NULL);
936 rqstp->rq_pages[i] = svsk->sk_pages[i];
937 svsk->sk_pages[i] = NULL;
938 }
939 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
940 return len;
941}
942
943static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
944{
945 unsigned int i, len, npages;
946
947 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
948 return;
949 len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
950 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
951 for (i = 0; i < npages; i++) {
952 svsk->sk_pages[i] = rqstp->rq_pages[i];
953 rqstp->rq_pages[i] = NULL;
954 }
955}
956
957static void svc_tcp_clear_pages(struct svc_sock *svsk)
958{
959 unsigned int i, len, npages;
960
961 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
962 goto out;
963 len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
964 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
965 for (i = 0; i < npages; i++) {
966 BUG_ON(svsk->sk_pages[i] == NULL);
967 put_page(svsk->sk_pages[i]);
968 svsk->sk_pages[i] = NULL;
969 }
970out:
971 svsk->sk_tcplen = 0;
972}
973
Tom Tuckerf9f3cc42007-12-30 21:07:40 -0600974/*
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300975 * Receive data.
976 * If we haven't gotten the record length yet, get the next four bytes.
977 * Otherwise try to gobble up as much as possible up to the complete
978 * record length.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 */
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300980static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981{
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600982 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Trond Myklebust5ee78d42009-05-18 17:47:56 -0400983 unsigned int want;
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300984 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
Tom Tucker02fc6c32007-12-30 21:07:48 -0600986 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987
Chuck Leverc0401ea2008-04-14 12:27:30 -0400988 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 struct kvec iov;
990
Trond Myklebust5ee78d42009-05-18 17:47:56 -0400991 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
993 iov.iov_len = want;
994 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
995 goto error;
996 svsk->sk_tcplen += len;
997
998 if (len < want) {
Chuck Leverc0401ea2008-04-14 12:27:30 -0400999 dprintk("svc: short recvfrom while reading record "
1000 "length (%d of %d)\n", len, want);
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001001 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 }
1003
1004 svsk->sk_reclen = ntohl(svsk->sk_reclen);
Chuck Leverc0401ea2008-04-14 12:27:30 -04001005 if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 /* FIXME: technically, a record can be fragmented,
1007 * and non-terminal fragments will not have the top
1008 * bit set in the fragment length header.
1009 * But apparently no known nfs clients send fragmented
1010 * records. */
Joe Perchese87cc472012-05-13 21:56:26 +00001011 net_notice_ratelimited("RPC: multiple fragments per record not supported\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 goto err_delete;
1013 }
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001014
Chuck Leverc0401ea2008-04-14 12:27:30 -04001015 svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
NeilBrownc6b0a9f2006-10-06 00:44:05 -07001017 if (svsk->sk_reclen > serv->sv_max_mesg) {
Joe Perchese87cc472012-05-13 21:56:26 +00001018 net_notice_ratelimited("RPC: fragment too large: 0x%08lx\n",
1019 (unsigned long)svsk->sk_reclen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 goto err_delete;
1021 }
1022 }
1023
J. Bruce Fieldscc6c2122011-02-14 15:03:35 -05001024 if (svsk->sk_reclen < 8)
1025 goto err_delete; /* client is nuts. */
1026
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 len = svsk->sk_reclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001029 return len;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001030error:
1031 dprintk("RPC: TCP recv_record got %d\n", len);
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001032 return len;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001033err_delete:
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001034 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001035 return -EAGAIN;
1036}
1037
Trond Myklebust586c52c2009-05-18 17:47:56 -04001038static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001039{
Trond Myklebust586c52c2009-05-18 17:47:56 -04001040 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001041 struct rpc_rqst *req = NULL;
Trond Myklebust586c52c2009-05-18 17:47:56 -04001042 struct kvec *src, *dst;
1043 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
J. Bruce Fields48e65552011-02-14 14:52:03 -05001044 __be32 xid;
1045 __be32 calldir;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001046
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001047 xid = *p++;
1048 calldir = *p;
1049
Trond Myklebust586c52c2009-05-18 17:47:56 -04001050 if (bc_xprt)
1051 req = xprt_lookup_rqst(bc_xprt, xid);
J. Bruce Fieldsd75faea2010-11-30 19:15:01 -05001052
Trond Myklebust586c52c2009-05-18 17:47:56 -04001053 if (!req) {
1054 printk(KERN_NOTICE
1055 "%s: Got unrecognized reply: "
1056 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
1057 __func__, ntohl(calldir),
1058 bc_xprt, xid);
1059 return -EAGAIN;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001060 }
Trond Myklebust586c52c2009-05-18 17:47:56 -04001061
1062 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
1063 /*
1064 * XXX!: cheating for now! Only copying HEAD.
1065 * But we know this is good enough for now (in fact, for any
1066 * callback reply in the forseeable future).
1067 */
1068 dst = &req->rq_private_buf.head[0];
1069 src = &rqstp->rq_arg.head[0];
1070 if (dst->iov_len < src->iov_len)
1071 return -EAGAIN; /* whatever; just giving up. */
1072 memcpy(dst->iov_base, src->iov_base, src->iov_len);
1073 xprt_complete_rqst(req->rq_task, svsk->sk_reclen);
1074 rqstp->rq_arg.len = 0;
1075 return 0;
1076}
1077
1078static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1079{
1080 int i = 0;
1081 int t = 0;
1082
1083 while (t < len) {
1084 vec[i].iov_base = page_address(pages[i]);
1085 vec[i].iov_len = PAGE_SIZE;
1086 i++;
1087 t += PAGE_SIZE;
1088 }
1089 return i;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001090}
1091
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001092
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001093/*
1094 * Receive data from a TCP socket.
1095 */
1096static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1097{
1098 struct svc_sock *svsk =
1099 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1100 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1101 int len;
1102 struct kvec *vec;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001103 unsigned int want, base;
Trond Myklebust586c52c2009-05-18 17:47:56 -04001104 __be32 *p;
1105 __be32 calldir;
Trond Myklebust5ee78d42009-05-18 17:47:56 -04001106 int pnum;
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001107
1108 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1109 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1110 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1111 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1112
1113 len = svc_tcp_recv_record(svsk, rqstp);
1114 if (len < 0)
1115 goto error;
1116
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001117 base = svc_tcp_restore_pages(svsk, rqstp);
1118 want = svsk->sk_reclen - base;
1119
NeilBrown3cc03b12006-10-04 02:15:47 -07001120 vec = rqstp->rq_vec;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001121
Trond Myklebust586c52c2009-05-18 17:47:56 -04001122 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
1123 svsk->sk_reclen);
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001124
NeilBrown44524352006-10-04 02:15:46 -07001125 rqstp->rq_respages = &rqstp->rq_pages[pnum];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
1127 /* Now receive data */
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001128 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
1129 if (len >= 0)
1130 svsk->sk_tcplen += len;
1131 if (len != want) {
1132 if (len < 0 && len != -EAGAIN)
1133 goto err_other;
1134 svc_tcp_save_pages(svsk, rqstp);
1135 dprintk("svc: incomplete TCP record (%d of %d)\n",
1136 svsk->sk_tcplen, svsk->sk_reclen);
1137 goto err_noclose;
1138 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139
Trond Myklebust5ee78d42009-05-18 17:47:56 -04001140 rqstp->rq_arg.len = svsk->sk_reclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 rqstp->rq_arg.page_base = 0;
Trond Myklebust5ee78d42009-05-18 17:47:56 -04001142 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1143 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 rqstp->rq_arg.page_len = 0;
Trond Myklebust5ee78d42009-05-18 17:47:56 -04001145 } else
1146 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147
Tom Tucker5148bf42007-12-30 21:07:25 -06001148 rqstp->rq_xprt_ctxt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 rqstp->rq_prot = IPPROTO_TCP;
1150
Trond Myklebust586c52c2009-05-18 17:47:56 -04001151 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1152 calldir = p[1];
J. Bruce Fields8985ef02011-04-09 10:03:10 -04001153 if (calldir)
Trond Myklebust586c52c2009-05-18 17:47:56 -04001154 len = receive_cb_reply(svsk, rqstp);
Trond Myklebust586c52c2009-05-18 17:47:56 -04001155
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 /* Reset TCP read info */
1157 svsk->sk_reclen = 0;
1158 svsk->sk_tcplen = 0;
Trond Myklebust0601f792009-05-18 17:47:56 -04001159 /* If we have more data, signal svc_xprt_enqueue() to try again */
1160 if (svc_recv_available(svsk) > sizeof(rpc_fraghdr))
1161 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1162
J. Bruce Fields8985ef02011-04-09 10:03:10 -04001163 if (len < 0)
1164 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165
Tom Tucker9dbc2402007-12-30 21:08:12 -06001166 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 if (serv->sv_stats)
1168 serv->sv_stats->nettcpcnt++;
1169
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001170 dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len);
Trond Myklebust5ee78d42009-05-18 17:47:56 -04001171 return rqstp->rq_arg.len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001173error:
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001174 if (len != -EAGAIN)
1175 goto err_other;
1176 dprintk("RPC: TCP recvfrom got EAGAIN\n");
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001177 return -EAGAIN;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001178err_other:
1179 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1180 svsk->sk_xprt.xpt_server->sv_name, -len);
1181 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1182err_noclose:
1183 return -EAGAIN; /* record not complete */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184}
1185
1186/*
1187 * Send out data on TCP socket.
1188 */
Tom Tucker0f0257e2007-12-30 21:08:27 -06001189static int svc_tcp_sendto(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190{
1191 struct xdr_buf *xbufp = &rqstp->rq_res;
1192 int sent;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001193 __be32 reclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
1195 /* Set up the first element of the reply kvec.
1196 * Any other kvecs that may be in use have been taken
1197 * care of by the server implementation itself.
1198 */
1199 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1200 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1201
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 sent = svc_sendto(rqstp, &rqstp->rq_res);
1203 if (sent != xbufp->len) {
Tom Tucker0f0257e2007-12-30 21:08:27 -06001204 printk(KERN_NOTICE
1205 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1206 "- shutting down socket\n",
Tom Tucker57b1d3b2007-12-30 21:08:22 -06001207 rqstp->rq_xprt->xpt_server->sv_name,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 (sent<0)?"got error":"sent only",
1209 sent, xbufp->len);
Tom Tucker57b1d3b2007-12-30 21:08:22 -06001210 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -06001211 svc_xprt_enqueue(rqstp->rq_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 sent = -EAGAIN;
1213 }
1214 return sent;
1215}
1216
Tom Tuckere831fe62007-12-30 21:07:29 -06001217/*
1218 * Setup response header. TCP has a 4B record length field.
1219 */
1220static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1221{
1222 struct kvec *resv = &rqstp->rq_res.head[0];
1223
1224 /* tcp needs a space for the record length... */
1225 svc_putnl(resv, 0);
1226}
1227
Tom Tucker323bee32007-12-30 21:07:31 -06001228static int svc_tcp_has_wspace(struct svc_xprt *xprt)
1229{
Tom Tucker57b1d3b2007-12-30 21:08:22 -06001230 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
Trond Myklebust47fcb032009-05-18 17:47:56 -04001231 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Tom Tucker323bee32007-12-30 21:07:31 -06001232 int required;
Tom Tucker323bee32007-12-30 21:07:31 -06001233
Trond Myklebust47fcb032009-05-18 17:47:56 -04001234 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
1235 return 1;
1236 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
1237 if (sk_stream_wspace(svsk->sk_sk) >= required)
1238 return 1;
Tom Tucker323bee32007-12-30 21:07:31 -06001239 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
Trond Myklebust47fcb032009-05-18 17:47:56 -04001240 return 0;
Tom Tucker323bee32007-12-30 21:07:31 -06001241}
1242
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001243static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
Pavel Emelyanov62832c02010-09-29 16:04:18 +04001244 struct net *net,
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001245 struct sockaddr *sa, int salen,
1246 int flags)
1247{
Pavel Emelyanov62832c02010-09-29 16:04:18 +04001248 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001249}
1250
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001251#if defined(CONFIG_SUNRPC_BACKCHANNEL)
Andy Adamson1f11a032011-01-06 02:04:26 +00001252static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
1253 struct net *, struct sockaddr *,
1254 int, int);
1255static void svc_bc_sock_free(struct svc_xprt *xprt);
1256
1257static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
1258 struct net *net,
1259 struct sockaddr *sa, int salen,
1260 int flags)
1261{
1262 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1263}
1264
1265static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
1266{
1267}
1268
1269static struct svc_xprt_ops svc_tcp_bc_ops = {
1270 .xpo_create = svc_bc_tcp_create,
1271 .xpo_detach = svc_bc_tcp_sock_detach,
1272 .xpo_free = svc_bc_sock_free,
1273 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1274};
1275
1276static struct svc_xprt_class svc_tcp_bc_class = {
1277 .xcl_name = "tcp-bc",
1278 .xcl_owner = THIS_MODULE,
1279 .xcl_ops = &svc_tcp_bc_ops,
1280 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1281};
Andy Adamson16b2d1e2011-01-06 02:04:27 +00001282
1283static void svc_init_bc_xprt_sock(void)
1284{
1285 svc_reg_xprt_class(&svc_tcp_bc_class);
1286}
1287
1288static void svc_cleanup_bc_xprt_sock(void)
1289{
1290 svc_unreg_xprt_class(&svc_tcp_bc_class);
1291}
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001292#else /* CONFIG_SUNRPC_BACKCHANNEL */
Andy Adamson16b2d1e2011-01-06 02:04:27 +00001293static void svc_init_bc_xprt_sock(void)
1294{
1295}
1296
1297static void svc_cleanup_bc_xprt_sock(void)
1298{
1299}
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001300#endif /* CONFIG_SUNRPC_BACKCHANNEL */
Andy Adamson1f11a032011-01-06 02:04:26 +00001301
Tom Tucker360d87382007-12-30 21:07:17 -06001302static struct svc_xprt_ops svc_tcp_ops = {
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001303 .xpo_create = svc_tcp_create,
Tom Tucker5d137992007-12-30 21:07:23 -06001304 .xpo_recvfrom = svc_tcp_recvfrom,
1305 .xpo_sendto = svc_tcp_sendto,
Tom Tucker5148bf42007-12-30 21:07:25 -06001306 .xpo_release_rqst = svc_release_skb,
Trond Myklebust69b6ba32008-12-23 16:30:11 -05001307 .xpo_detach = svc_tcp_sock_detach,
Tom Tucker755ccea2007-12-30 21:07:27 -06001308 .xpo_free = svc_sock_free,
Tom Tuckere831fe62007-12-30 21:07:29 -06001309 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
Tom Tucker323bee32007-12-30 21:07:31 -06001310 .xpo_has_wspace = svc_tcp_has_wspace,
Tom Tucker38a417c2007-12-30 21:07:36 -06001311 .xpo_accept = svc_tcp_accept,
Tom Tucker360d87382007-12-30 21:07:17 -06001312};
1313
1314static struct svc_xprt_class svc_tcp_class = {
1315 .xcl_name = "tcp",
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001316 .xcl_owner = THIS_MODULE,
Tom Tucker360d87382007-12-30 21:07:17 -06001317 .xcl_ops = &svc_tcp_ops,
Tom Tucker49023152007-12-30 21:07:21 -06001318 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
Tom Tucker360d87382007-12-30 21:07:17 -06001319};
1320
1321void svc_init_xprt_sock(void)
1322{
1323 svc_reg_xprt_class(&svc_tcp_class);
1324 svc_reg_xprt_class(&svc_udp_class);
Andy Adamson16b2d1e2011-01-06 02:04:27 +00001325 svc_init_bc_xprt_sock();
Tom Tucker360d87382007-12-30 21:07:17 -06001326}
1327
1328void svc_cleanup_xprt_sock(void)
1329{
1330 svc_unreg_xprt_class(&svc_tcp_class);
1331 svc_unreg_xprt_class(&svc_udp_class);
Andy Adamson16b2d1e2011-01-06 02:04:27 +00001332 svc_cleanup_bc_xprt_sock();
Tom Tucker360d87382007-12-30 21:07:17 -06001333}
1334
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001335static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336{
1337 struct sock *sk = svsk->sk_sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
Stanislav Kinsburskybd4620d2011-12-06 14:19:10 +03001339 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1340 &svsk->sk_xprt, serv);
Tom Tuckerdef13d72007-12-30 21:08:08 -06001341 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 if (sk->sk_state == TCP_LISTEN) {
1343 dprintk("setting up TCP socket for listening\n");
Tom Tucker02fc6c32007-12-30 21:07:48 -06001344 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 sk->sk_data_ready = svc_tcp_listen_data_ready;
Tom Tucker02fc6c32007-12-30 21:07:48 -06001346 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 } else {
1348 dprintk("setting up TCP socket for reading\n");
1349 sk->sk_state_change = svc_tcp_state_change;
1350 sk->sk_data_ready = svc_tcp_data_ready;
Trond Myklebust47fcb032009-05-18 17:47:56 -04001351 sk->sk_write_space = svc_tcp_write_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352
1353 svsk->sk_reclen = 0;
1354 svsk->sk_tcplen = 0;
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001355 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356
Chuck Leverb7872fe2008-04-14 12:27:01 -04001357 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358
Tom Tucker02fc6c32007-12-30 21:07:48 -06001359 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001360 if (sk->sk_state != TCP_ESTABLISHED)
Tom Tucker02fc6c32007-12-30 21:07:48 -06001361 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 }
1363}
1364
Tom Tucker0f0257e2007-12-30 21:08:27 -06001365void svc_sock_update_bufs(struct svc_serv *serv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366{
1367 /*
1368 * The number of server threads has changed. Update
1369 * rcvbuf and sndbuf accordingly on all sockets
1370 */
Pavel Emelyanov8f3a6de2010-10-05 23:30:19 +04001371 struct svc_sock *svsk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372
1373 spin_lock_bh(&serv->sv_lock);
Pavel Emelyanov8f3a6de2010-10-05 23:30:19 +04001374 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
Tom Tucker02fc6c32007-12-30 21:07:48 -06001375 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 spin_unlock_bh(&serv->sv_lock);
1377}
Trond Myklebust24c37672008-12-23 16:30:12 -05001378EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379
1380/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 * Initialize socket for RPC use and create svc_sock struct
1382 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1383 */
Chuck Lever6b174332007-02-12 00:53:28 -08001384static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1385 struct socket *sock,
1386 int *errp, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387{
1388 struct svc_sock *svsk;
1389 struct sock *inet;
Chuck Lever6b174332007-02-12 00:53:28 -08001390 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391
1392 dprintk("svc: svc_setup_socket %p\n", sock);
Panagiotis Issaris0da974f2006-07-21 14:51:30 -07001393 if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 *errp = -ENOMEM;
1395 return NULL;
1396 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397
1398 inet = sock->sk;
1399
1400 /* Register socket with portmapper */
1401 if (*errp >= 0 && pmap_register)
Trond Myklebustd3b773e2012-01-23 13:22:45 -05001402 *errp = svc_register(serv, sock_net(sock->sk), inet->sk_family,
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +04001403 inet->sk_protocol,
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001404 ntohs(inet_sk(inet)->inet_sport));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405
1406 if (*errp < 0) {
1407 kfree(svsk);
1408 return NULL;
1409 }
1410
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 inet->sk_user_data = svsk;
1412 svsk->sk_sock = sock;
1413 svsk->sk_sk = inet;
1414 svsk->sk_ostate = inet->sk_state_change;
1415 svsk->sk_odata = inet->sk_data_ready;
1416 svsk->sk_owspace = inet->sk_write_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417
1418 /* Initialize the socket */
1419 if (sock->type == SOCK_DGRAM)
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001420 svc_udp_init(svsk, serv);
Olga Kornievskaia96604392008-10-21 14:13:47 -04001421 else {
1422 /* initialise setting must have enough space to
1423 * receive and respond to one request.
1424 */
1425 svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg,
1426 4 * serv->sv_max_mesg);
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001427 svc_tcp_init(svsk, serv);
Olga Kornievskaia96604392008-10-21 14:13:47 -04001428 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1431 svsk, svsk->sk_sk);
1432
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 return svsk;
1434}
1435
Chuck Leverbfba9ab2009-04-23 19:32:33 -04001436/**
1437 * svc_addsock - add a listener socket to an RPC service
1438 * @serv: pointer to RPC service to which to add a new listener
1439 * @fd: file descriptor of the new listener
1440 * @name_return: pointer to buffer to fill in with name of listener
1441 * @len: size of the buffer
1442 *
1443 * Fills in socket name and returns positive length of name if successful.
1444 * Name is terminated with '\n'. On error, returns a negative errno
1445 * value.
1446 */
1447int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1448 const size_t len)
NeilBrownb41b66d2006-10-02 02:17:48 -07001449{
1450 int err = 0;
1451 struct socket *so = sockfd_lookup(fd, &err);
1452 struct svc_sock *svsk = NULL;
1453
1454 if (!so)
1455 return err;
Aime Le Rouzic205ba422010-01-26 14:03:56 -05001456 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
NeilBrownb41b66d2006-10-02 02:17:48 -07001457 err = -EAFNOSUPPORT;
1458 else if (so->sk->sk_protocol != IPPROTO_TCP &&
1459 so->sk->sk_protocol != IPPROTO_UDP)
1460 err = -EPROTONOSUPPORT;
1461 else if (so->state > SS_UNCONNECTED)
1462 err = -EISCONN;
1463 else {
Tom Tucker2da2c212008-11-23 09:58:08 -06001464 if (!try_module_get(THIS_MODULE))
1465 err = -ENOENT;
1466 else
1467 svsk = svc_setup_socket(serv, so, &err,
1468 SVC_SOCK_DEFAULTS);
NeilBrowne79eff12007-02-12 00:53:30 -08001469 if (svsk) {
Tom Tucker9dbc2402007-12-30 21:08:12 -06001470 struct sockaddr_storage addr;
1471 struct sockaddr *sin = (struct sockaddr *)&addr;
1472 int salen;
1473 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1474 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
Tom Tucker4e5caaa2007-12-30 21:08:20 -06001475 clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
1476 spin_lock_bh(&serv->sv_lock);
1477 list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks);
1478 spin_unlock_bh(&serv->sv_lock);
Tom Tuckera6046f72007-12-30 21:08:01 -06001479 svc_xprt_received(&svsk->sk_xprt);
NeilBrownb41b66d2006-10-02 02:17:48 -07001480 err = 0;
Tom Tucker2da2c212008-11-23 09:58:08 -06001481 } else
1482 module_put(THIS_MODULE);
NeilBrownb41b66d2006-10-02 02:17:48 -07001483 }
1484 if (err) {
1485 sockfd_put(so);
1486 return err;
1487 }
Chuck Levere7942b92009-04-23 19:32:48 -04001488 return svc_one_sock_name(svsk, name_return, len);
NeilBrownb41b66d2006-10-02 02:17:48 -07001489}
1490EXPORT_SYMBOL_GPL(svc_addsock);
1491
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492/*
1493 * Create socket for RPC service.
1494 */
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001495static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1496 int protocol,
Pavel Emelyanov62832c02010-09-29 16:04:18 +04001497 struct net *net,
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001498 struct sockaddr *sin, int len,
1499 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500{
1501 struct svc_sock *svsk;
1502 struct socket *sock;
1503 int error;
1504 int type;
Tom Tucker9dbc2402007-12-30 21:08:12 -06001505 struct sockaddr_storage addr;
1506 struct sockaddr *newsin = (struct sockaddr *)&addr;
1507 int newlen;
Trond Myklebustc69da772009-03-30 18:59:17 -04001508 int family;
1509 int val;
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +03001510 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
Chuck Leverad06e4b2007-02-12 00:53:32 -08001512 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1513 serv->sv_program->pg_name, protocol,
Chuck Lever77f1f672007-02-12 00:53:39 -08001514 __svc_print_addr(sin, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515
1516 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1517 printk(KERN_WARNING "svc: only UDP and TCP "
1518 "sockets supported\n");
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001519 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521
Trond Myklebustc69da772009-03-30 18:59:17 -04001522 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1523 switch (sin->sa_family) {
1524 case AF_INET6:
1525 family = PF_INET6;
1526 break;
1527 case AF_INET:
1528 family = PF_INET;
1529 break;
1530 default:
1531 return ERR_PTR(-EINVAL);
1532 }
1533
Pavel Emelyanov14ec63c2010-09-29 16:06:57 +04001534 error = __sock_create(net, family, type, protocol, &sock, 1);
Chuck Lever77f1f672007-02-12 00:53:39 -08001535 if (error < 0)
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001536 return ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537
Peter Zijlstraed075362006-12-06 20:35:24 -08001538 svc_reclassify_socket(sock);
1539
Trond Myklebustc69da772009-03-30 18:59:17 -04001540 /*
1541 * If this is an PF_INET6 listener, we want to avoid
1542 * getting requests from IPv4 remotes. Those should
1543 * be shunted to a PF_INET listener via rpcbind.
1544 */
1545 val = 1;
1546 if (family == PF_INET6)
1547 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1548 (char *)&val, sizeof(val));
1549
Eric Sesterhenn18114742006-09-28 14:37:07 -07001550 if (type == SOCK_STREAM)
Pavel Emelyanov4a17fd52012-04-19 03:39:36 +00001551 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
Chuck Lever77f1f672007-02-12 00:53:39 -08001552 error = kernel_bind(sock, sin, len);
Eric Sesterhenn18114742006-09-28 14:37:07 -07001553 if (error < 0)
1554 goto bummer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555
Tom Tucker9dbc2402007-12-30 21:08:12 -06001556 newlen = len;
1557 error = kernel_getsockname(sock, newsin, &newlen);
1558 if (error < 0)
1559 goto bummer;
1560
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561 if (protocol == IPPROTO_TCP) {
Sridhar Samudralae6242e92006-08-07 20:58:01 -07001562 if ((error = kernel_listen(sock, 64)) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 goto bummer;
1564 }
1565
NeilBrowne79eff12007-02-12 00:53:30 -08001566 if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) {
Tom Tucker9dbc2402007-12-30 21:08:12 -06001567 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001568 return (struct svc_xprt *)svsk;
NeilBrowne79eff12007-02-12 00:53:30 -08001569 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570
1571bummer:
1572 dprintk("svc: svc_create_socket error = %d\n", -error);
1573 sock_release(sock);
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001574 return ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575}
1576
1577/*
Tom Tucker755ccea2007-12-30 21:07:27 -06001578 * Detach the svc_sock from the socket so that no
1579 * more callbacks occur.
1580 */
1581static void svc_sock_detach(struct svc_xprt *xprt)
1582{
1583 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1584 struct sock *sk = svsk->sk_sk;
Eric Dumazeteaefd112011-02-18 03:26:36 +00001585 wait_queue_head_t *wq;
Tom Tucker755ccea2007-12-30 21:07:27 -06001586
1587 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1588
1589 /* put back the old socket callbacks */
1590 sk->sk_state_change = svsk->sk_ostate;
1591 sk->sk_data_ready = svsk->sk_odata;
1592 sk->sk_write_space = svsk->sk_owspace;
Trond Myklebust69b6ba32008-12-23 16:30:11 -05001593
Eric Dumazeteaefd112011-02-18 03:26:36 +00001594 wq = sk_sleep(sk);
1595 if (wq && waitqueue_active(wq))
1596 wake_up_interruptible(wq);
Trond Myklebust69b6ba32008-12-23 16:30:11 -05001597}
1598
1599/*
1600 * Disconnect the socket, and reset the callbacks
1601 */
1602static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1603{
1604 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1605
1606 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1607
1608 svc_sock_detach(xprt);
1609
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001610 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1611 svc_tcp_clear_pages(svsk);
Trond Myklebust69b6ba32008-12-23 16:30:11 -05001612 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
J. Bruce Fields31d68ef2011-02-24 11:25:33 -08001613 }
Tom Tucker755ccea2007-12-30 21:07:27 -06001614}
1615
1616/*
1617 * Free the svc_sock's socket resources and the svc_sock itself.
1618 */
1619static void svc_sock_free(struct svc_xprt *xprt)
1620{
1621 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1622 dprintk("svc: svc_sock_free(%p)\n", svsk);
1623
Tom Tucker755ccea2007-12-30 21:07:27 -06001624 if (svsk->sk_sock->file)
1625 sockfd_put(svsk->sk_sock);
1626 else
1627 sock_release(svsk->sk_sock);
1628 kfree(svsk);
1629}
Benny Halevy7652e5a2009-04-01 09:23:09 -04001630
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001631#if defined(CONFIG_SUNRPC_BACKCHANNEL)
Benny Halevy7652e5a2009-04-01 09:23:09 -04001632/*
Andy Adamson1f11a032011-01-06 02:04:26 +00001633 * Create a back channel svc_xprt which shares the fore channel socket.
Benny Halevy7652e5a2009-04-01 09:23:09 -04001634 */
Andy Adamson1f11a032011-01-06 02:04:26 +00001635static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
1636 int protocol,
1637 struct net *net,
1638 struct sockaddr *sin, int len,
1639 int flags)
Benny Halevy7652e5a2009-04-01 09:23:09 -04001640{
1641 struct svc_sock *svsk;
Andy Adamson1f11a032011-01-06 02:04:26 +00001642 struct svc_xprt *xprt;
Benny Halevy7652e5a2009-04-01 09:23:09 -04001643
Andy Adamson1f11a032011-01-06 02:04:26 +00001644 if (protocol != IPPROTO_TCP) {
1645 printk(KERN_WARNING "svc: only TCP sockets"
1646 " supported on shared back channel\n");
1647 return ERR_PTR(-EINVAL);
1648 }
1649
Benny Halevy7652e5a2009-04-01 09:23:09 -04001650 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1651 if (!svsk)
Andy Adamson1f11a032011-01-06 02:04:26 +00001652 return ERR_PTR(-ENOMEM);
Benny Halevy7652e5a2009-04-01 09:23:09 -04001653
1654 xprt = &svsk->sk_xprt;
Stanislav Kinsburskybd4620d2011-12-06 14:19:10 +03001655 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
Andy Adamson1f11a032011-01-06 02:04:26 +00001656
Andy Adamson4a19de02011-01-06 02:04:35 +00001657 serv->sv_bc_xprt = xprt;
Andy Adamson1f11a032011-01-06 02:04:26 +00001658
Benny Halevy7652e5a2009-04-01 09:23:09 -04001659 return xprt;
1660}
Benny Halevy7652e5a2009-04-01 09:23:09 -04001661
1662/*
Andy Adamson1f11a032011-01-06 02:04:26 +00001663 * Free a back channel svc_sock.
Benny Halevy7652e5a2009-04-01 09:23:09 -04001664 */
Andy Adamson1f11a032011-01-06 02:04:26 +00001665static void svc_bc_sock_free(struct svc_xprt *xprt)
Benny Halevy7652e5a2009-04-01 09:23:09 -04001666{
Andy Adamson778be232011-01-25 15:38:01 +00001667 if (xprt)
Benny Halevy7652e5a2009-04-01 09:23:09 -04001668 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1669}
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001670#endif /* CONFIG_SUNRPC_BACKCHANNEL */