blob: a29f259204e69d190a334bc0f1dc77bd1de6043a [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>
24#include <linux/errno.h>
25#include <linux/fcntl.h>
26#include <linux/net.h>
27#include <linux/in.h>
28#include <linux/inet.h>
29#include <linux/udp.h>
Andrew Morton91483c42005-08-09 20:20:07 -070030#include <linux/tcp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/unistd.h>
32#include <linux/slab.h>
33#include <linux/netdevice.h>
34#include <linux/skbuff.h>
NeilBrownb41b66d2006-10-02 02:17:48 -070035#include <linux/file.h>
Nigel Cunningham7dfb7102006-12-06 20:34:23 -080036#include <linux/freezer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <net/sock.h>
38#include <net/checksum.h>
39#include <net/ip.h>
Chuck Leverb92503b2007-02-12 00:53:36 -080040#include <net/ipv6.h>
Chuck Leverb7872fe2008-04-14 12:27:01 -040041#include <net/tcp.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070042#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <asm/uaccess.h>
44#include <asm/ioctls.h>
45
46#include <linux/sunrpc/types.h>
Chuck Leverad06e4b2007-02-12 00:53:32 -080047#include <linux/sunrpc/clnt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <linux/sunrpc/xdr.h>
Chuck Leverc0401ea2008-04-14 12:27:30 -040049#include <linux/sunrpc/msg_prot.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/sunrpc/svcsock.h>
51#include <linux/sunrpc/stats.h>
Rahul Iyer4cfc7e62009-09-10 17:32:28 +030052#include <linux/sunrpc/xprt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Tom Tucker360d87382007-12-30 21:07:17 -060054#define RPCDBG_FACILITY RPCDBG_SVCXPRT
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56
57static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
Chuck Lever6b174332007-02-12 00:53:28 -080058 int *errp, int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059static void svc_udp_data_ready(struct sock *, int);
60static int svc_udp_recvfrom(struct svc_rqst *);
61static int svc_udp_sendto(struct svc_rqst *);
Tom Tucker755ccea2007-12-30 21:07:27 -060062static void svc_sock_detach(struct svc_xprt *);
Trond Myklebust69b6ba32008-12-23 16:30:11 -050063static void svc_tcp_sock_detach(struct svc_xprt *);
Tom Tucker755ccea2007-12-30 21:07:27 -060064static void svc_sock_free(struct svc_xprt *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Tom Tuckerb700cbb2007-12-30 21:07:42 -060066static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
67 struct sockaddr *, int, int);
Peter Zijlstraed075362006-12-06 20:35:24 -080068#ifdef CONFIG_DEBUG_LOCK_ALLOC
69static struct lock_class_key svc_key[2];
70static struct lock_class_key svc_slock_key[2];
71
Tom Tucker0f0257e2007-12-30 21:08:27 -060072static void svc_reclassify_socket(struct socket *sock)
Peter Zijlstraed075362006-12-06 20:35:24 -080073{
74 struct sock *sk = sock->sk;
John Heffner02b3d342007-09-12 10:42:12 +020075 BUG_ON(sock_owned_by_user(sk));
Peter Zijlstraed075362006-12-06 20:35:24 -080076 switch (sk->sk_family) {
77 case AF_INET:
78 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
Tom Tuckerdef13d72007-12-30 21:08:08 -060079 &svc_slock_key[0],
80 "sk_xprt.xpt_lock-AF_INET-NFSD",
81 &svc_key[0]);
Peter Zijlstraed075362006-12-06 20:35:24 -080082 break;
83
84 case AF_INET6:
85 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
Tom Tuckerdef13d72007-12-30 21:08:08 -060086 &svc_slock_key[1],
87 "sk_xprt.xpt_lock-AF_INET6-NFSD",
88 &svc_key[1]);
Peter Zijlstraed075362006-12-06 20:35:24 -080089 break;
90
91 default:
92 BUG();
93 }
94}
95#else
Tom Tucker0f0257e2007-12-30 21:08:27 -060096static void svc_reclassify_socket(struct socket *sock)
Peter Zijlstraed075362006-12-06 20:35:24 -080097{
98}
99#endif
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101/*
102 * Release an skbuff after use
103 */
Tom Tucker5148bf42007-12-30 21:07:25 -0600104static void svc_release_skb(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
Tom Tucker5148bf42007-12-30 21:07:25 -0600106 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
108 if (skb) {
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600109 struct svc_sock *svsk =
110 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Tom Tucker5148bf42007-12-30 21:07:25 -0600111 rqstp->rq_xprt_ctxt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
Eric Dumazet9d410c72009-10-30 05:03:53 +0000114 skb_free_datagram_locked(svsk->sk_sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116}
117
Chuck Leverb92503b2007-02-12 00:53:36 -0800118union svc_pktinfo_u {
119 struct in_pktinfo pkti;
Chuck Leverb92503b2007-02-12 00:53:36 -0800120 struct in6_pktinfo pkti6;
Chuck Leverb92503b2007-02-12 00:53:36 -0800121};
David S. Millerbc375ea2007-04-12 13:35:59 -0700122#define SVC_PKTINFO_SPACE \
123 CMSG_SPACE(sizeof(union svc_pktinfo_u))
Chuck Leverb92503b2007-02-12 00:53:36 -0800124
125static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
126{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600127 struct svc_sock *svsk =
128 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
129 switch (svsk->sk_sk->sk_family) {
Chuck Leverb92503b2007-02-12 00:53:36 -0800130 case AF_INET: {
131 struct in_pktinfo *pki = CMSG_DATA(cmh);
132
133 cmh->cmsg_level = SOL_IP;
134 cmh->cmsg_type = IP_PKTINFO;
135 pki->ipi_ifindex = 0;
136 pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr;
137 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
138 }
139 break;
NeilBrown5a05ed72007-03-06 01:42:22 -0800140
Chuck Leverb92503b2007-02-12 00:53:36 -0800141 case AF_INET6: {
142 struct in6_pktinfo *pki = CMSG_DATA(cmh);
143
144 cmh->cmsg_level = SOL_IPV6;
145 cmh->cmsg_type = IPV6_PKTINFO;
146 pki->ipi6_ifindex = 0;
147 ipv6_addr_copy(&pki->ipi6_addr,
148 &rqstp->rq_daddr.addr6);
149 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
150 }
151 break;
Chuck Leverb92503b2007-02-12 00:53:36 -0800152 }
153 return;
154}
155
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156/*
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300157 * send routine intended to be shared by the fore- and back-channel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 */
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300159int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
160 struct page *headpage, unsigned long headoffset,
161 struct page *tailpage, unsigned long tailoffset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 int result;
164 int size;
165 struct page **ppage = xdr->pages;
166 size_t base = xdr->page_base;
167 unsigned int pglen = xdr->page_len;
168 unsigned int flags = MSG_MORE;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300169 int slen;
170 int len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172 slen = xdr->len;
173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 /* send head */
175 if (slen == xdr->head[0].iov_len)
176 flags = 0;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300177 len = kernel_sendpage(sock, headpage, headoffset,
NeilBrown44524352006-10-04 02:15:46 -0700178 xdr->head[0].iov_len, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 if (len != xdr->head[0].iov_len)
180 goto out;
181 slen -= xdr->head[0].iov_len;
182 if (slen == 0)
183 goto out;
184
185 /* send page data */
186 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
187 while (pglen > 0) {
188 if (slen == size)
189 flags = 0;
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700190 result = kernel_sendpage(sock, *ppage, base, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 if (result > 0)
192 len += result;
193 if (result != size)
194 goto out;
195 slen -= size;
196 pglen -= size;
197 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
198 base = 0;
199 ppage++;
200 }
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 /* send tail */
203 if (xdr->tail[0].iov_len) {
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300204 result = kernel_sendpage(sock, tailpage, tailoffset,
205 xdr->tail[0].iov_len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 if (result > 0)
207 len += result;
208 }
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300209
210out:
211 return len;
212}
213
214
215/*
216 * Generic sendto routine
217 */
218static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
219{
220 struct svc_sock *svsk =
221 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
222 struct socket *sock = svsk->sk_sock;
223 union {
224 struct cmsghdr hdr;
225 long all[SVC_PKTINFO_SPACE / sizeof(long)];
226 } buffer;
227 struct cmsghdr *cmh = &buffer.hdr;
228 int len = 0;
229 unsigned long tailoff;
230 unsigned long headoff;
231 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
232
233 if (rqstp->rq_prot == IPPROTO_UDP) {
234 struct msghdr msg = {
235 .msg_name = &rqstp->rq_addr,
236 .msg_namelen = rqstp->rq_addrlen,
237 .msg_control = cmh,
238 .msg_controllen = sizeof(buffer),
239 .msg_flags = MSG_MORE,
240 };
241
242 svc_set_cmsg_data(rqstp, cmh);
243
244 if (sock_sendmsg(sock, &msg, 0) < 0)
245 goto out;
246 }
247
248 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
249 headoff = 0;
250 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
251 rqstp->rq_respages[0], tailoff);
252
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253out:
Chuck Leverad06e4b2007-02-12 00:53:32 -0800254 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600255 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
Chuck Leverad06e4b2007-02-12 00:53:32 -0800256 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258 return len;
259}
260
261/*
NeilBrown80212d52006-10-02 02:17:47 -0700262 * Report socket names for nfsdfs
263 */
Chuck Levere7942b92009-04-23 19:32:48 -0400264static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
NeilBrown80212d52006-10-02 02:17:47 -0700265{
Chuck Lever017cb472009-04-23 19:33:03 -0400266 const struct sock *sk = svsk->sk_sk;
267 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
268 "udp" : "tcp";
NeilBrown80212d52006-10-02 02:17:47 -0700269 int len;
270
Chuck Lever017cb472009-04-23 19:33:03 -0400271 switch (sk->sk_family) {
Chuck Levere7942b92009-04-23 19:32:48 -0400272 case PF_INET:
273 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
Chuck Lever017cb472009-04-23 19:33:03 -0400274 proto_name,
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000275 &inet_sk(sk)->inet_rcv_saddr,
276 inet_sk(sk)->inet_num);
NeilBrown80212d52006-10-02 02:17:47 -0700277 break;
Chuck Lever58de2f82009-04-23 19:32:55 -0400278 case PF_INET6:
279 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
Chuck Lever017cb472009-04-23 19:33:03 -0400280 proto_name,
281 &inet6_sk(sk)->rcv_saddr,
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000282 inet_sk(sk)->inet_num);
NeilBrown80212d52006-10-02 02:17:47 -0700283 break;
284 default:
Chuck Levere7942b92009-04-23 19:32:48 -0400285 len = snprintf(buf, remaining, "*unknown-%d*\n",
Chuck Lever017cb472009-04-23 19:33:03 -0400286 sk->sk_family);
NeilBrown80212d52006-10-02 02:17:47 -0700287 }
Chuck Levere7942b92009-04-23 19:32:48 -0400288
289 if (len >= remaining) {
290 *buf = '\0';
291 return -ENAMETOOLONG;
NeilBrown80212d52006-10-02 02:17:47 -0700292 }
293 return len;
294}
295
Chuck Lever8435d342009-04-23 19:32:40 -0400296/**
297 * svc_sock_names - construct a list of listener names in a string
298 * @serv: pointer to RPC service
299 * @buf: pointer to a buffer to fill in with socket names
300 * @buflen: size of the buffer to be filled
301 * @toclose: pointer to '\0'-terminated C string containing the name
302 * of a listener to be closed
303 *
304 * Fills in @buf with a '\n'-separated list of names of listener
305 * sockets. If @toclose is not NULL, the socket named by @toclose
306 * is closed, and is not included in the output list.
307 *
308 * Returns positive length of the socket name string, or a negative
309 * errno value on error.
310 */
311int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen,
312 const char *toclose)
NeilBrown80212d52006-10-02 02:17:47 -0700313{
NeilBrownb41b66d2006-10-02 02:17:48 -0700314 struct svc_sock *svsk, *closesk = NULL;
NeilBrown80212d52006-10-02 02:17:47 -0700315 int len = 0;
316
317 if (!serv)
318 return 0;
Chuck Levere7942b92009-04-23 19:32:48 -0400319
NeilBrownaaf68cf2007-02-08 14:20:30 -0800320 spin_lock_bh(&serv->sv_lock);
Tom Tucker7a182082007-12-30 21:07:53 -0600321 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
Chuck Levere7942b92009-04-23 19:32:48 -0400322 int onelen = svc_one_sock_name(svsk, buf + len, buflen - len);
323 if (onelen < 0) {
324 len = onelen;
325 break;
326 }
327 if (toclose && strcmp(toclose, buf + len) == 0)
NeilBrownb41b66d2006-10-02 02:17:48 -0700328 closesk = svsk;
329 else
330 len += onelen;
NeilBrown80212d52006-10-02 02:17:47 -0700331 }
NeilBrownaaf68cf2007-02-08 14:20:30 -0800332 spin_unlock_bh(&serv->sv_lock);
Chuck Levere7942b92009-04-23 19:32:48 -0400333
NeilBrownb41b66d2006-10-02 02:17:48 -0700334 if (closesk)
NeilBrown5680c442006-10-04 02:15:45 -0700335 /* Should unregister with portmap, but you cannot
336 * unregister just one protocol...
337 */
Tom Tucker7a182082007-12-30 21:07:53 -0600338 svc_close_xprt(&closesk->sk_xprt);
NeilBrown37a03472006-10-04 02:15:44 -0700339 else if (toclose)
340 return -ENOENT;
NeilBrown80212d52006-10-02 02:17:47 -0700341 return len;
342}
Trond Myklebust24c37672008-12-23 16:30:12 -0500343EXPORT_SYMBOL_GPL(svc_sock_names);
NeilBrown80212d52006-10-02 02:17:47 -0700344
345/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 * Check input queue length
347 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600348static int svc_recv_available(struct svc_sock *svsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 struct socket *sock = svsk->sk_sock;
351 int avail, err;
352
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700353 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 return (err >= 0)? avail : err;
356}
357
358/*
359 * Generic recvfrom routine.
360 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600361static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
362 int buflen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600364 struct svc_sock *svsk =
365 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Chuck Lever1ba95102007-02-12 00:53:31 -0800366 struct msghdr msg = {
367 .msg_flags = MSG_DONTWAIT,
368 };
369 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Tom Tucker260c1d12007-12-30 21:08:29 -0600371 rqstp->rq_xprt_hlen = 0;
372
Chuck Lever1ba95102007-02-12 00:53:31 -0800373 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
374 msg.msg_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
Chuck Lever1ba95102007-02-12 00:53:31 -0800377 svsk, iov[0].iov_base, iov[0].iov_len, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 return len;
379}
380
381/*
382 * Set socket snd and rcv buffer lengths
383 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600384static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
385 unsigned int rcv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386{
387#if 0
388 mm_segment_t oldfs;
389 oldfs = get_fs(); set_fs(KERNEL_DS);
390 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
391 (char*)&snd, sizeof(snd));
392 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
393 (char*)&rcv, sizeof(rcv));
394#else
395 /* sock_setsockopt limits use to sysctl_?mem_max,
396 * which isn't acceptable. Until that is made conditional
397 * on not having CAP_SYS_RESOURCE or similar, we go direct...
398 * DaveM said I could!
399 */
400 lock_sock(sock->sk);
401 sock->sk->sk_sndbuf = snd * 2;
402 sock->sk->sk_rcvbuf = rcv * 2;
J. Bruce Fields7f421832009-05-27 18:51:06 -0400403 sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
Trond Myklebust47fcb032009-05-18 17:47:56 -0400404 sock->sk->sk_write_space(sock->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 release_sock(sock->sk);
406#endif
407}
408/*
409 * INET callback when data has been received on the socket.
410 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600411static void svc_udp_data_ready(struct sock *sk, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412{
Neil Brown939bb7e2005-09-13 01:25:39 -0700413 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
Neil Brown939bb7e2005-09-13 01:25:39 -0700415 if (svsk) {
416 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
Tom Tucker02fc6c32007-12-30 21:07:48 -0600417 svsk, sk, count,
418 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
419 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600420 svc_xprt_enqueue(&svsk->sk_xprt);
Neil Brown939bb7e2005-09-13 01:25:39 -0700421 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
423 wake_up_interruptible(sk->sk_sleep);
424}
425
426/*
427 * INET callback when space is newly available on the socket.
428 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600429static void svc_write_space(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430{
431 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
432
433 if (svsk) {
434 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
Tom Tucker02fc6c32007-12-30 21:07:48 -0600435 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
Tom Tuckerf6150c32007-12-30 21:07:57 -0600436 svc_xprt_enqueue(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 }
438
439 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) {
Neil Brown939bb7e2005-09-13 01:25:39 -0700440 dprintk("RPC svc_write_space: someone sleeping on %p\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 svsk);
442 wake_up_interruptible(sk->sk_sleep);
443 }
444}
445
Trond Myklebust47fcb032009-05-18 17:47:56 -0400446static void svc_tcp_write_space(struct sock *sk)
447{
448 struct socket *sock = sk->sk_socket;
449
450 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock)
451 clear_bit(SOCK_NOSPACE, &sock->flags);
452 svc_write_space(sk);
453}
454
Tom Tucker9dbc2402007-12-30 21:08:12 -0600455/*
Chuck Lever7702ce42009-07-13 10:54:26 -0400456 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
457 */
458static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
459 struct cmsghdr *cmh)
460{
461 struct in_pktinfo *pki = CMSG_DATA(cmh);
462 if (cmh->cmsg_type != IP_PKTINFO)
463 return 0;
464 rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr;
465 return 1;
466}
467
468/*
469 * See net/ipv6/datagram.c : datagram_recv_ctl
470 */
471static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
472 struct cmsghdr *cmh)
473{
474 struct in6_pktinfo *pki = CMSG_DATA(cmh);
475 if (cmh->cmsg_type != IPV6_PKTINFO)
476 return 0;
477 ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr);
478 return 1;
479}
480
481/*
Tom Tucker9dbc2402007-12-30 21:08:12 -0600482 * Copy the UDP datagram's destination address to the rqstp structure.
483 * The 'destination' address in this case is the address to which the
484 * peer sent the datagram, i.e. our local address. For multihomed
485 * hosts, this can change from msg to msg. Note that only the IP
486 * address changes, the port number should remain the same.
487 */
Chuck Lever7702ce42009-07-13 10:54:26 -0400488static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
489 struct cmsghdr *cmh)
Chuck Lever95756482007-02-12 00:53:38 -0800490{
Chuck Lever7702ce42009-07-13 10:54:26 -0400491 switch (cmh->cmsg_level) {
492 case SOL_IP:
493 return svc_udp_get_dest_address4(rqstp, cmh);
494 case SOL_IPV6:
495 return svc_udp_get_dest_address6(rqstp, cmh);
Chuck Lever95756482007-02-12 00:53:38 -0800496 }
Chuck Lever7702ce42009-07-13 10:54:26 -0400497
498 return 0;
Chuck Lever95756482007-02-12 00:53:38 -0800499}
500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501/*
502 * Receive a datagram from a UDP socket.
503 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600504static int svc_udp_recvfrom(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600506 struct svc_sock *svsk =
507 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600508 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 struct sk_buff *skb;
David S. Millerbc375ea2007-04-12 13:35:59 -0700510 union {
511 struct cmsghdr hdr;
512 long all[SVC_PKTINFO_SPACE / sizeof(long)];
513 } buffer;
514 struct cmsghdr *cmh = &buffer.hdr;
NeilBrown7a37f572007-03-06 01:42:21 -0800515 struct msghdr msg = {
516 .msg_name = svc_addr(rqstp),
517 .msg_control = cmh,
518 .msg_controllen = sizeof(buffer),
519 .msg_flags = MSG_DONTWAIT,
520 };
Chuck Leverabc5c442009-04-23 19:31:25 -0400521 size_t len;
522 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
Tom Tucker02fc6c32007-12-30 21:07:48 -0600524 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 /* udp sockets need large rcvbuf as all pending
526 * requests are still in that buffer. sndbuf must
527 * also be large enough that there is enough space
Greg Banks3262c812006-10-02 02:17:58 -0700528 * for one reply per thread. We count all threads
529 * rather than threads in a particular pool, which
530 * provides an upper bound on the number of threads
531 * which will access the socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 */
533 svc_sock_setbufsize(svsk->sk_sock,
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700534 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
535 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
Tom Tucker02fc6c32007-12-30 21:07:48 -0600537 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
NeilBrown05ed6902007-05-09 02:34:55 -0700538 skb = NULL;
539 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
540 0, 0, MSG_PEEK | MSG_DONTWAIT);
541 if (err >= 0)
542 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
543
544 if (skb == NULL) {
545 if (err != -EAGAIN) {
546 /* possibly an icmp error */
547 dprintk("svc: recvfrom returned error %d\n", -err);
Tom Tucker02fc6c32007-12-30 21:07:48 -0600548 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 }
Tom Tuckera6046f72007-12-30 21:08:01 -0600550 svc_xprt_received(&svsk->sk_xprt);
NeilBrown05ed6902007-05-09 02:34:55 -0700551 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 }
Tom Tucker9dbc2402007-12-30 21:08:12 -0600553 len = svc_addr_len(svc_addr(rqstp));
Chuck Leverabc5c442009-04-23 19:31:25 -0400554 if (len == 0)
555 return -EAFNOSUPPORT;
Tom Tucker9dbc2402007-12-30 21:08:12 -0600556 rqstp->rq_addrlen = len;
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700557 if (skb->tstamp.tv64 == 0) {
558 skb->tstamp = ktime_get_real();
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800559 /* Don't enable netstamp, sunrpc doesn't
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 need that much accuracy */
561 }
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700562 svsk->sk_sk->sk_stamp = skb->tstamp;
Tom Tucker02fc6c32007-12-30 21:07:48 -0600563 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
565 /*
566 * Maybe more packets - kick another thread ASAP.
567 */
Tom Tuckera6046f72007-12-30 21:08:01 -0600568 svc_xprt_received(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
570 len = skb->len - sizeof(struct udphdr);
571 rqstp->rq_arg.len = len;
572
Chuck Lever95756482007-02-12 00:53:38 -0800573 rqstp->rq_prot = IPPROTO_UDP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
Chuck Lever7702ce42009-07-13 10:54:26 -0400575 if (!svc_udp_get_dest_address(rqstp, cmh)) {
NeilBrown7a37f572007-03-06 01:42:21 -0800576 if (net_ratelimit())
Chuck Lever7702ce42009-07-13 10:54:26 -0400577 printk(KERN_WARNING
578 "svc: received unknown control message %d/%d; "
579 "dropping RPC reply datagram\n",
580 cmh->cmsg_level, cmh->cmsg_type);
Eric Dumazet9d410c72009-10-30 05:03:53 +0000581 skb_free_datagram_locked(svsk->sk_sk, skb);
NeilBrown7a37f572007-03-06 01:42:21 -0800582 return 0;
583 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
585 if (skb_is_nonlinear(skb)) {
586 /* we have to copy */
587 local_bh_disable();
588 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
589 local_bh_enable();
590 /* checksum error */
Eric Dumazet9d410c72009-10-30 05:03:53 +0000591 skb_free_datagram_locked(svsk->sk_sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 return 0;
593 }
594 local_bh_enable();
Eric Dumazet9d410c72009-10-30 05:03:53 +0000595 skb_free_datagram_locked(svsk->sk_sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 } else {
597 /* we can use it in-place */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600598 rqstp->rq_arg.head[0].iov_base = skb->data +
599 sizeof(struct udphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 rqstp->rq_arg.head[0].iov_len = len;
Herbert Xufb286bb2005-11-10 13:01:24 -0800601 if (skb_checksum_complete(skb)) {
Eric Dumazet9d410c72009-10-30 05:03:53 +0000602 skb_free_datagram_locked(svsk->sk_sk, skb);
Herbert Xufb286bb2005-11-10 13:01:24 -0800603 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 }
Tom Tucker5148bf42007-12-30 21:07:25 -0600605 rqstp->rq_xprt_ctxt = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 }
607
608 rqstp->rq_arg.page_base = 0;
609 if (len <= rqstp->rq_arg.head[0].iov_len) {
610 rqstp->rq_arg.head[0].iov_len = len;
611 rqstp->rq_arg.page_len = 0;
NeilBrown44524352006-10-04 02:15:46 -0700612 rqstp->rq_respages = rqstp->rq_pages+1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 } else {
614 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
NeilBrown44524352006-10-04 02:15:46 -0700615 rqstp->rq_respages = rqstp->rq_pages + 1 +
Ilpo Järvinen172589c2007-08-28 15:50:33 -0700616 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 }
618
619 if (serv->sv_stats)
620 serv->sv_stats->netudpcnt++;
621
622 return len;
623}
624
625static int
626svc_udp_sendto(struct svc_rqst *rqstp)
627{
628 int error;
629
630 error = svc_sendto(rqstp, &rqstp->rq_res);
631 if (error == -ECONNREFUSED)
632 /* ICMP error on earlier request. */
633 error = svc_sendto(rqstp, &rqstp->rq_res);
634
635 return error;
636}
637
Tom Tuckere831fe62007-12-30 21:07:29 -0600638static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
639{
640}
641
Tom Tucker323bee32007-12-30 21:07:31 -0600642static int svc_udp_has_wspace(struct svc_xprt *xprt)
643{
644 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600645 struct svc_serv *serv = xprt->xpt_server;
Tom Tucker323bee32007-12-30 21:07:31 -0600646 unsigned long required;
647
648 /*
649 * Set the SOCK_NOSPACE flag before checking the available
650 * sock space.
651 */
652 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
Tom Tucker7a90e8c2007-12-30 21:07:55 -0600653 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
Tom Tucker323bee32007-12-30 21:07:31 -0600654 if (required*2 > sock_wspace(svsk->sk_sk))
655 return 0;
656 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
657 return 1;
658}
659
Tom Tucker38a417c2007-12-30 21:07:36 -0600660static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
661{
662 BUG();
663 return NULL;
664}
665
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600666static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
667 struct sockaddr *sa, int salen,
668 int flags)
669{
670 return svc_create_socket(serv, IPPROTO_UDP, sa, salen, flags);
671}
672
Tom Tucker360d87382007-12-30 21:07:17 -0600673static struct svc_xprt_ops svc_udp_ops = {
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600674 .xpo_create = svc_udp_create,
Tom Tucker5d137992007-12-30 21:07:23 -0600675 .xpo_recvfrom = svc_udp_recvfrom,
676 .xpo_sendto = svc_udp_sendto,
Tom Tucker5148bf42007-12-30 21:07:25 -0600677 .xpo_release_rqst = svc_release_skb,
Tom Tucker755ccea2007-12-30 21:07:27 -0600678 .xpo_detach = svc_sock_detach,
679 .xpo_free = svc_sock_free,
Tom Tuckere831fe62007-12-30 21:07:29 -0600680 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
Tom Tucker323bee32007-12-30 21:07:31 -0600681 .xpo_has_wspace = svc_udp_has_wspace,
Tom Tucker38a417c2007-12-30 21:07:36 -0600682 .xpo_accept = svc_udp_accept,
Tom Tucker360d87382007-12-30 21:07:17 -0600683};
684
685static struct svc_xprt_class svc_udp_class = {
686 .xcl_name = "udp",
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600687 .xcl_owner = THIS_MODULE,
Tom Tucker360d87382007-12-30 21:07:17 -0600688 .xcl_ops = &svc_udp_ops,
Tom Tucker49023152007-12-30 21:07:21 -0600689 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
Tom Tucker360d87382007-12-30 21:07:17 -0600690};
691
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600692static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693{
Chuck Lever7702ce42009-07-13 10:54:26 -0400694 int err, level, optname, one = 1;
NeilBrown7a37f572007-03-06 01:42:21 -0800695
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600696 svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv);
Tom Tuckerdef13d72007-12-30 21:08:08 -0600697 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
699 svsk->sk_sk->sk_write_space = svc_write_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
701 /* initialise setting must have enough space to
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800702 * receive and respond to one request.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 * svc_udp_recvfrom will re-adjust if necessary
704 */
705 svc_sock_setbufsize(svsk->sk_sock,
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600706 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
707 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
Tom Tucker0f0257e2007-12-30 21:08:27 -0600709 /* data might have come in before data_ready set up */
710 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Tom Tucker02fc6c32007-12-30 21:07:48 -0600711 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
NeilBrown7a37f572007-03-06 01:42:21 -0800712
NeilBrown7a37f572007-03-06 01:42:21 -0800713 /* make sure we get destination address info */
Chuck Lever7702ce42009-07-13 10:54:26 -0400714 switch (svsk->sk_sk->sk_family) {
715 case AF_INET:
716 level = SOL_IP;
717 optname = IP_PKTINFO;
718 break;
719 case AF_INET6:
720 level = SOL_IPV6;
721 optname = IPV6_RECVPKTINFO;
722 break;
723 default:
724 BUG();
725 }
726 err = kernel_setsockopt(svsk->sk_sock, level, optname,
727 (char *)&one, sizeof(one));
728 dprintk("svc: kernel_setsockopt returned %d\n", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729}
730
731/*
732 * A data_ready event on a listening socket means there's a connection
733 * pending. Do not use state_change as a substitute for it.
734 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600735static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736{
Neil Brown939bb7e2005-09-13 01:25:39 -0700737 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
739 dprintk("svc: socket %p TCP (listen) state change %d\n",
Neil Brown939bb7e2005-09-13 01:25:39 -0700740 sk, sk->sk_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741
Neil Brown939bb7e2005-09-13 01:25:39 -0700742 /*
743 * This callback may called twice when a new connection
744 * is established as a child socket inherits everything
745 * from a parent LISTEN socket.
746 * 1) data_ready method of the parent socket will be called
747 * when one of child sockets become ESTABLISHED.
748 * 2) data_ready method of the child socket may be called
749 * when it receives data before the socket is accepted.
750 * In case of 2, we should ignore it silently.
751 */
752 if (sk->sk_state == TCP_LISTEN) {
753 if (svsk) {
Tom Tucker02fc6c32007-12-30 21:07:48 -0600754 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600755 svc_xprt_enqueue(&svsk->sk_xprt);
Neil Brown939bb7e2005-09-13 01:25:39 -0700756 } else
757 printk("svc: socket %p: no user data\n", sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 }
Neil Brown939bb7e2005-09-13 01:25:39 -0700759
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
761 wake_up_interruptible_all(sk->sk_sleep);
762}
763
764/*
765 * A state change on a connected socket means it's dying or dead.
766 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600767static void svc_tcp_state_change(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768{
Neil Brown939bb7e2005-09-13 01:25:39 -0700769 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
781 wake_up_interruptible_all(sk->sk_sleep);
782}
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
788 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
Neil Brown939bb7e2005-09-13 01:25:39 -0700789 sk, sk->sk_user_data);
790 if (svsk) {
Tom Tucker02fc6c32007-12-30 21:07:48 -0600791 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600792 svc_xprt_enqueue(&svsk->sk_xprt);
Neil Brown939bb7e2005-09-13 01:25:39 -0700793 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
795 wake_up_interruptible(sk->sk_sleep);
796}
797
798/*
799 * Accept a TCP connection
800 */
Tom Tucker38a417c2007-12-30 21:07:36 -0600801static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802{
Tom Tucker38a417c2007-12-30 21:07:36 -0600803 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800804 struct sockaddr_storage addr;
805 struct sockaddr *sin = (struct sockaddr *) &addr;
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600806 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 struct socket *sock = svsk->sk_sock;
808 struct socket *newsock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 struct svc_sock *newsvsk;
810 int err, slen;
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +0300811 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
813 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
814 if (!sock)
Tom Tucker38a417c2007-12-30 21:07:36 -0600815 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816
Tom Tucker02fc6c32007-12-30 21:07:48 -0600817 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700818 err = kernel_accept(sock, &newsock, O_NONBLOCK);
819 if (err < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 if (err == -ENOMEM)
821 printk(KERN_WARNING "%s: no more sockets!\n",
822 serv->sv_name);
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700823 else if (err != -EAGAIN && net_ratelimit())
824 printk(KERN_WARNING "%s: accept failed (err %d)!\n",
825 serv->sv_name, -err);
Tom Tucker38a417c2007-12-30 21:07:36 -0600826 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 }
Tom Tucker02fc6c32007-12-30 21:07:48 -0600828 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800830 err = kernel_getpeername(newsock, sin, &slen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 if (err < 0) {
832 if (net_ratelimit())
833 printk(KERN_WARNING "%s: peername failed (err %d)!\n",
834 serv->sv_name, -err);
835 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
Chuck Lever6b174332007-02-12 00:53:28 -0800856 if (!(newsvsk = svc_setup_socket(serv, newsock, &err,
857 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 goto failed;
Tom Tucker9dbc2402007-12-30 21:08:12 -0600859 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
Frank van Maarseveena9747692007-07-09 22:21:39 +0200860 err = kernel_getsockname(newsock, sin, &slen);
861 if (unlikely(err < 0)) {
862 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
863 slen = offsetof(struct sockaddr, sa_data);
864 }
Tom Tucker9dbc2402007-12-30 21:08:12 -0600865 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
Chuck Lever067d7812007-02-12 00:53:30 -0800866
Tom Tuckerf9f3cc42007-12-30 21:07:40 -0600867 if (serv->sv_stats)
868 serv->sv_stats->nettcpconn++;
869
870 return &newsvsk->sk_xprt;
871
872failed:
873 sock_release(newsock);
874 return NULL;
875}
876
877/*
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300878 * Receive data.
879 * If we haven't gotten the record length yet, get the next four bytes.
880 * Otherwise try to gobble up as much as possible up to the complete
881 * record length.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 */
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300883static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884{
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600885 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300886 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
J. Bruce Fields7f421832009-05-27 18:51:06 -0400888 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
889 /* sndbuf needs to have room for one request
890 * per thread, otherwise we can stall even when the
891 * network isn't a bottleneck.
892 *
893 * We count all threads rather than threads in a
894 * particular pool, which provides an upper bound
895 * on the number of threads which will access the socket.
896 *
897 * rcvbuf just needs to be able to hold a few requests.
898 * Normally they will be removed from the queue
899 * as soon a a complete request arrives.
900 */
901 svc_sock_setbufsize(svsk->sk_sock,
902 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
903 3 * serv->sv_max_mesg);
904
Tom Tucker02fc6c32007-12-30 21:07:48 -0600905 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
Chuck Leverc0401ea2008-04-14 12:27:30 -0400907 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
908 int want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 struct kvec iov;
910
911 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
912 iov.iov_len = want;
913 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
914 goto error;
915 svsk->sk_tcplen += len;
916
917 if (len < want) {
Chuck Leverc0401ea2008-04-14 12:27:30 -0400918 dprintk("svc: short recvfrom while reading record "
919 "length (%d of %d)\n", len, want);
Tom Tuckera6046f72007-12-30 21:08:01 -0600920 svc_xprt_received(&svsk->sk_xprt);
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300921 goto err_again; /* record header not complete */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 }
923
924 svsk->sk_reclen = ntohl(svsk->sk_reclen);
Chuck Leverc0401ea2008-04-14 12:27:30 -0400925 if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 /* FIXME: technically, a record can be fragmented,
927 * and non-terminal fragments will not have the top
928 * bit set in the fragment length header.
929 * But apparently no known nfs clients send fragmented
930 * records. */
NeilBrown34e9a632007-01-29 13:19:52 -0800931 if (net_ratelimit())
Chuck Leverc0401ea2008-04-14 12:27:30 -0400932 printk(KERN_NOTICE "RPC: multiple fragments "
933 "per record not supported\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 goto err_delete;
935 }
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300936
Chuck Leverc0401ea2008-04-14 12:27:30 -0400937 svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700939 if (svsk->sk_reclen > serv->sv_max_mesg) {
NeilBrown34e9a632007-01-29 13:19:52 -0800940 if (net_ratelimit())
Chuck Leverc0401ea2008-04-14 12:27:30 -0400941 printk(KERN_NOTICE "RPC: "
942 "fragment too large: 0x%08lx\n",
943 (unsigned long)svsk->sk_reclen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 goto err_delete;
945 }
946 }
947
948 /* Check whether enough data is available */
949 len = svc_recv_available(svsk);
950 if (len < 0)
951 goto error;
952
953 if (len < svsk->sk_reclen) {
954 dprintk("svc: incomplete TCP record (%d of %d)\n",
955 len, svsk->sk_reclen);
Tom Tuckera6046f72007-12-30 21:08:01 -0600956 svc_xprt_received(&svsk->sk_xprt);
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300957 goto err_again; /* record not complete */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 }
959 len = svsk->sk_reclen;
Tom Tucker02fc6c32007-12-30 21:07:48 -0600960 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300962 return len;
963 error:
964 if (len == -EAGAIN) {
965 dprintk("RPC: TCP recv_record got EAGAIN\n");
966 svc_xprt_received(&svsk->sk_xprt);
967 }
968 return len;
969 err_delete:
970 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
Neil Brown301e99c2010-02-28 22:01:05 -0500971 svc_xprt_received(&svsk->sk_xprt);
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +0300972 err_again:
973 return -EAGAIN;
974}
975
Rahul Iyer4cfc7e62009-09-10 17:32:28 +0300976static int svc_process_calldir(struct svc_sock *svsk, struct svc_rqst *rqstp,
977 struct rpc_rqst **reqpp, struct kvec *vec)
978{
979 struct rpc_rqst *req = NULL;
980 u32 *p;
981 u32 xid;
982 u32 calldir;
983 int len;
984
985 len = svc_recvfrom(rqstp, vec, 1, 8);
986 if (len < 0)
987 goto error;
988
989 p = (u32 *)rqstp->rq_arg.head[0].iov_base;
990 xid = *p++;
991 calldir = *p;
992
993 if (calldir == 0) {
994 /* REQUEST is the most common case */
995 vec[0] = rqstp->rq_arg.head[0];
996 } else {
997 /* REPLY */
998 if (svsk->sk_bc_xprt)
999 req = xprt_lookup_rqst(svsk->sk_bc_xprt, xid);
1000
1001 if (!req) {
1002 printk(KERN_NOTICE
1003 "%s: Got unrecognized reply: "
1004 "calldir 0x%x sk_bc_xprt %p xid %08x\n",
1005 __func__, ntohl(calldir),
1006 svsk->sk_bc_xprt, xid);
1007 vec[0] = rqstp->rq_arg.head[0];
1008 goto out;
1009 }
1010
1011 memcpy(&req->rq_private_buf, &req->rq_rcv_buf,
1012 sizeof(struct xdr_buf));
1013 /* copy the xid and call direction */
1014 memcpy(req->rq_private_buf.head[0].iov_base,
1015 rqstp->rq_arg.head[0].iov_base, 8);
1016 vec[0] = req->rq_private_buf.head[0];
1017 }
1018 out:
1019 vec[0].iov_base += 8;
1020 vec[0].iov_len -= 8;
1021 len = svsk->sk_reclen - 8;
1022 error:
1023 *reqpp = req;
1024 return len;
1025}
1026
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001027/*
1028 * Receive data from a TCP socket.
1029 */
1030static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1031{
1032 struct svc_sock *svsk =
1033 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1034 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1035 int len;
1036 struct kvec *vec;
1037 int pnum, vlen;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001038 struct rpc_rqst *req = NULL;
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001039
1040 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1041 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1042 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1043 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1044
1045 len = svc_tcp_recv_record(svsk, rqstp);
1046 if (len < 0)
1047 goto error;
1048
NeilBrown3cc03b12006-10-04 02:15:47 -07001049 vec = rqstp->rq_vec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 vec[0] = rqstp->rq_arg.head[0];
1051 vlen = PAGE_SIZE;
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001052
1053 /*
1054 * We have enough data for the whole tcp record. Let's try and read the
1055 * first 8 bytes to get the xid and the call direction. We can use this
1056 * to figure out if this is a call or a reply to a callback. If
1057 * sk_reclen is < 8 (xid and calldir), then this is a malformed packet.
1058 * In that case, don't bother with the calldir and just read the data.
1059 * It will be rejected in svc_process.
1060 */
1061 if (len >= 8) {
1062 len = svc_process_calldir(svsk, rqstp, &req, vec);
1063 if (len < 0)
1064 goto err_again;
1065 vlen -= 8;
1066 }
1067
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 pnum = 1;
1069 while (vlen < len) {
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001070 vec[pnum].iov_base = (req) ?
1071 page_address(req->rq_private_buf.pages[pnum - 1]) :
1072 page_address(rqstp->rq_pages[pnum]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 vec[pnum].iov_len = PAGE_SIZE;
1074 pnum++;
1075 vlen += PAGE_SIZE;
1076 }
NeilBrown44524352006-10-04 02:15:46 -07001077 rqstp->rq_respages = &rqstp->rq_pages[pnum];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078
1079 /* Now receive data */
1080 len = svc_recvfrom(rqstp, vec, pnum, len);
1081 if (len < 0)
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001082 goto err_again;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001084 /*
1085 * Account for the 8 bytes we read earlier
1086 */
1087 len += 8;
1088
1089 if (req) {
1090 xprt_complete_rqst(req->rq_task, len);
1091 len = 0;
1092 goto out;
1093 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 dprintk("svc: TCP complete record (%d bytes)\n", len);
1095 rqstp->rq_arg.len = len;
1096 rqstp->rq_arg.page_base = 0;
1097 if (len <= rqstp->rq_arg.head[0].iov_len) {
1098 rqstp->rq_arg.head[0].iov_len = len;
1099 rqstp->rq_arg.page_len = 0;
1100 } else {
1101 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
1102 }
1103
Tom Tucker5148bf42007-12-30 21:07:25 -06001104 rqstp->rq_xprt_ctxt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 rqstp->rq_prot = IPPROTO_TCP;
1106
Rahul Iyer4cfc7e62009-09-10 17:32:28 +03001107out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 /* Reset TCP read info */
1109 svsk->sk_reclen = 0;
1110 svsk->sk_tcplen = 0;
1111
Tom Tucker9dbc2402007-12-30 21:08:12 -06001112 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
Tom Tuckera6046f72007-12-30 21:08:01 -06001113 svc_xprt_received(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 if (serv->sv_stats)
1115 serv->sv_stats->nettcpcnt++;
1116
1117 return len;
1118
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001119err_again:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 if (len == -EAGAIN) {
1121 dprintk("RPC: TCP recvfrom got EAGAIN\n");
Tom Tuckera6046f72007-12-30 21:08:01 -06001122 svc_xprt_received(&svsk->sk_xprt);
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001123 return len;
1124 }
1125error:
1126 if (len != -EAGAIN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001128 svsk->sk_xprt.xpt_server->sv_name, -len);
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001129 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 }
Alexandros Batsakis8f55f3c2009-08-20 03:34:19 +03001131 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132}
1133
1134/*
1135 * Send out data on TCP socket.
1136 */
Tom Tucker0f0257e2007-12-30 21:08:27 -06001137static int svc_tcp_sendto(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138{
1139 struct xdr_buf *xbufp = &rqstp->rq_res;
1140 int sent;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001141 __be32 reclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142
1143 /* Set up the first element of the reply kvec.
1144 * Any other kvecs that may be in use have been taken
1145 * care of by the server implementation itself.
1146 */
1147 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1148 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1149
Tom Tucker57b1d3b2007-12-30 21:08:22 -06001150 if (test_bit(XPT_DEAD, &rqstp->rq_xprt->xpt_flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 return -ENOTCONN;
1152
1153 sent = svc_sendto(rqstp, &rqstp->rq_res);
1154 if (sent != xbufp->len) {
Tom Tucker0f0257e2007-12-30 21:08:27 -06001155 printk(KERN_NOTICE
1156 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1157 "- shutting down socket\n",
Tom Tucker57b1d3b2007-12-30 21:08:22 -06001158 rqstp->rq_xprt->xpt_server->sv_name,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 (sent<0)?"got error":"sent only",
1160 sent, xbufp->len);
Tom Tucker57b1d3b2007-12-30 21:08:22 -06001161 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -06001162 svc_xprt_enqueue(rqstp->rq_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 sent = -EAGAIN;
1164 }
1165 return sent;
1166}
1167
Tom Tuckere831fe62007-12-30 21:07:29 -06001168/*
1169 * Setup response header. TCP has a 4B record length field.
1170 */
1171static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1172{
1173 struct kvec *resv = &rqstp->rq_res.head[0];
1174
1175 /* tcp needs a space for the record length... */
1176 svc_putnl(resv, 0);
1177}
1178
Tom Tucker323bee32007-12-30 21:07:31 -06001179static int svc_tcp_has_wspace(struct svc_xprt *xprt)
1180{
Tom Tucker57b1d3b2007-12-30 21:08:22 -06001181 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
Trond Myklebust47fcb032009-05-18 17:47:56 -04001182 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Tom Tucker323bee32007-12-30 21:07:31 -06001183 int required;
Tom Tucker323bee32007-12-30 21:07:31 -06001184
Trond Myklebust47fcb032009-05-18 17:47:56 -04001185 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
1186 return 1;
1187 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
1188 if (sk_stream_wspace(svsk->sk_sk) >= required)
1189 return 1;
Tom Tucker323bee32007-12-30 21:07:31 -06001190 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
Trond Myklebust47fcb032009-05-18 17:47:56 -04001191 return 0;
Tom Tucker323bee32007-12-30 21:07:31 -06001192}
1193
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001194static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1195 struct sockaddr *sa, int salen,
1196 int flags)
1197{
1198 return svc_create_socket(serv, IPPROTO_TCP, sa, salen, flags);
1199}
1200
Tom Tucker360d87382007-12-30 21:07:17 -06001201static struct svc_xprt_ops svc_tcp_ops = {
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001202 .xpo_create = svc_tcp_create,
Tom Tucker5d137992007-12-30 21:07:23 -06001203 .xpo_recvfrom = svc_tcp_recvfrom,
1204 .xpo_sendto = svc_tcp_sendto,
Tom Tucker5148bf42007-12-30 21:07:25 -06001205 .xpo_release_rqst = svc_release_skb,
Trond Myklebust69b6ba32008-12-23 16:30:11 -05001206 .xpo_detach = svc_tcp_sock_detach,
Tom Tucker755ccea2007-12-30 21:07:27 -06001207 .xpo_free = svc_sock_free,
Tom Tuckere831fe62007-12-30 21:07:29 -06001208 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
Tom Tucker323bee32007-12-30 21:07:31 -06001209 .xpo_has_wspace = svc_tcp_has_wspace,
Tom Tucker38a417c2007-12-30 21:07:36 -06001210 .xpo_accept = svc_tcp_accept,
Tom Tucker360d87382007-12-30 21:07:17 -06001211};
1212
1213static struct svc_xprt_class svc_tcp_class = {
1214 .xcl_name = "tcp",
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001215 .xcl_owner = THIS_MODULE,
Tom Tucker360d87382007-12-30 21:07:17 -06001216 .xcl_ops = &svc_tcp_ops,
Tom Tucker49023152007-12-30 21:07:21 -06001217 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
Tom Tucker360d87382007-12-30 21:07:17 -06001218};
1219
1220void svc_init_xprt_sock(void)
1221{
1222 svc_reg_xprt_class(&svc_tcp_class);
1223 svc_reg_xprt_class(&svc_udp_class);
1224}
1225
1226void svc_cleanup_xprt_sock(void)
1227{
1228 svc_unreg_xprt_class(&svc_tcp_class);
1229 svc_unreg_xprt_class(&svc_udp_class);
1230}
1231
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001232static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233{
1234 struct sock *sk = svsk->sk_sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001236 svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv);
Tom Tuckerdef13d72007-12-30 21:08:08 -06001237 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 if (sk->sk_state == TCP_LISTEN) {
1239 dprintk("setting up TCP socket for listening\n");
Tom Tucker02fc6c32007-12-30 21:07:48 -06001240 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 sk->sk_data_ready = svc_tcp_listen_data_ready;
Tom Tucker02fc6c32007-12-30 21:07:48 -06001242 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 } else {
1244 dprintk("setting up TCP socket for reading\n");
1245 sk->sk_state_change = svc_tcp_state_change;
1246 sk->sk_data_ready = svc_tcp_data_ready;
Trond Myklebust47fcb032009-05-18 17:47:56 -04001247 sk->sk_write_space = svc_tcp_write_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248
1249 svsk->sk_reclen = 0;
1250 svsk->sk_tcplen = 0;
1251
Chuck Leverb7872fe2008-04-14 12:27:01 -04001252 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
J. Bruce Fields7f421832009-05-27 18:51:06 -04001254 /* initialise setting must have enough space to
1255 * receive and respond to one request.
1256 * svc_tcp_recvfrom will re-adjust if necessary
1257 */
1258 svc_sock_setbufsize(svsk->sk_sock,
1259 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
1260 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
1261
1262 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
Tom Tucker02fc6c32007-12-30 21:07:48 -06001263 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001264 if (sk->sk_state != TCP_ESTABLISHED)
Tom Tucker02fc6c32007-12-30 21:07:48 -06001265 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 }
1267}
1268
Tom Tucker0f0257e2007-12-30 21:08:27 -06001269void svc_sock_update_bufs(struct svc_serv *serv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270{
1271 /*
1272 * The number of server threads has changed. Update
1273 * rcvbuf and sndbuf accordingly on all sockets
1274 */
1275 struct list_head *le;
1276
1277 spin_lock_bh(&serv->sv_lock);
1278 list_for_each(le, &serv->sv_permsocks) {
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001279 struct svc_sock *svsk =
Tom Tucker7a182082007-12-30 21:07:53 -06001280 list_entry(le, struct svc_sock, sk_xprt.xpt_list);
Tom Tucker02fc6c32007-12-30 21:07:48 -06001281 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282 }
1283 list_for_each(le, &serv->sv_tempsocks) {
1284 struct svc_sock *svsk =
Tom Tucker7a182082007-12-30 21:07:53 -06001285 list_entry(le, struct svc_sock, sk_xprt.xpt_list);
Tom Tucker02fc6c32007-12-30 21:07:48 -06001286 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 }
1288 spin_unlock_bh(&serv->sv_lock);
1289}
Trond Myklebust24c37672008-12-23 16:30:12 -05001290EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291
1292/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 * Initialize socket for RPC use and create svc_sock struct
1294 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1295 */
Chuck Lever6b174332007-02-12 00:53:28 -08001296static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1297 struct socket *sock,
1298 int *errp, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299{
1300 struct svc_sock *svsk;
1301 struct sock *inet;
Chuck Lever6b174332007-02-12 00:53:28 -08001302 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303
1304 dprintk("svc: svc_setup_socket %p\n", sock);
Panagiotis Issaris0da974f2006-07-21 14:51:30 -07001305 if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 *errp = -ENOMEM;
1307 return NULL;
1308 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309
1310 inet = sock->sk;
1311
1312 /* Register socket with portmapper */
1313 if (*errp >= 0 && pmap_register)
Chuck Leverbaf01ca2009-03-18 20:46:13 -04001314 *errp = svc_register(serv, inet->sk_family, inet->sk_protocol,
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001315 ntohs(inet_sk(inet)->inet_sport));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316
1317 if (*errp < 0) {
1318 kfree(svsk);
1319 return NULL;
1320 }
1321
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 inet->sk_user_data = svsk;
1323 svsk->sk_sock = sock;
1324 svsk->sk_sk = inet;
1325 svsk->sk_ostate = inet->sk_state_change;
1326 svsk->sk_odata = inet->sk_data_ready;
1327 svsk->sk_owspace = inet->sk_write_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328
1329 /* Initialize the socket */
1330 if (sock->type == SOCK_DGRAM)
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001331 svc_udp_init(svsk, serv);
J. Bruce Fields7f421832009-05-27 18:51:06 -04001332 else
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001333 svc_tcp_init(svsk, serv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1336 svsk, svsk->sk_sk);
1337
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 return svsk;
1339}
1340
Chuck Leverbfba9ab2009-04-23 19:32:33 -04001341/**
1342 * svc_addsock - add a listener socket to an RPC service
1343 * @serv: pointer to RPC service to which to add a new listener
1344 * @fd: file descriptor of the new listener
1345 * @name_return: pointer to buffer to fill in with name of listener
1346 * @len: size of the buffer
1347 *
1348 * Fills in socket name and returns positive length of name if successful.
1349 * Name is terminated with '\n'. On error, returns a negative errno
1350 * value.
1351 */
1352int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1353 const size_t len)
NeilBrownb41b66d2006-10-02 02:17:48 -07001354{
1355 int err = 0;
1356 struct socket *so = sockfd_lookup(fd, &err);
1357 struct svc_sock *svsk = NULL;
1358
1359 if (!so)
1360 return err;
Aime Le Rouzic205ba422010-01-26 14:03:56 -05001361 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
NeilBrownb41b66d2006-10-02 02:17:48 -07001362 err = -EAFNOSUPPORT;
1363 else if (so->sk->sk_protocol != IPPROTO_TCP &&
1364 so->sk->sk_protocol != IPPROTO_UDP)
1365 err = -EPROTONOSUPPORT;
1366 else if (so->state > SS_UNCONNECTED)
1367 err = -EISCONN;
1368 else {
Tom Tucker2da2c212008-11-23 09:58:08 -06001369 if (!try_module_get(THIS_MODULE))
1370 err = -ENOENT;
1371 else
1372 svsk = svc_setup_socket(serv, so, &err,
1373 SVC_SOCK_DEFAULTS);
NeilBrowne79eff12007-02-12 00:53:30 -08001374 if (svsk) {
Tom Tucker9dbc2402007-12-30 21:08:12 -06001375 struct sockaddr_storage addr;
1376 struct sockaddr *sin = (struct sockaddr *)&addr;
1377 int salen;
1378 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1379 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
Tom Tucker4e5caaa2007-12-30 21:08:20 -06001380 clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
1381 spin_lock_bh(&serv->sv_lock);
1382 list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks);
1383 spin_unlock_bh(&serv->sv_lock);
Tom Tuckera6046f72007-12-30 21:08:01 -06001384 svc_xprt_received(&svsk->sk_xprt);
NeilBrownb41b66d2006-10-02 02:17:48 -07001385 err = 0;
Tom Tucker2da2c212008-11-23 09:58:08 -06001386 } else
1387 module_put(THIS_MODULE);
NeilBrownb41b66d2006-10-02 02:17:48 -07001388 }
1389 if (err) {
1390 sockfd_put(so);
1391 return err;
1392 }
Chuck Levere7942b92009-04-23 19:32:48 -04001393 return svc_one_sock_name(svsk, name_return, len);
NeilBrownb41b66d2006-10-02 02:17:48 -07001394}
1395EXPORT_SYMBOL_GPL(svc_addsock);
1396
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397/*
1398 * Create socket for RPC service.
1399 */
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001400static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1401 int protocol,
1402 struct sockaddr *sin, int len,
1403 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404{
1405 struct svc_sock *svsk;
1406 struct socket *sock;
1407 int error;
1408 int type;
Tom Tucker9dbc2402007-12-30 21:08:12 -06001409 struct sockaddr_storage addr;
1410 struct sockaddr *newsin = (struct sockaddr *)&addr;
1411 int newlen;
Trond Myklebustc69da772009-03-30 18:59:17 -04001412 int family;
1413 int val;
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +03001414 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415
Chuck Leverad06e4b2007-02-12 00:53:32 -08001416 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1417 serv->sv_program->pg_name, protocol,
Chuck Lever77f1f672007-02-12 00:53:39 -08001418 __svc_print_addr(sin, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419
1420 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1421 printk(KERN_WARNING "svc: only UDP and TCP "
1422 "sockets supported\n");
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001423 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425
Trond Myklebustc69da772009-03-30 18:59:17 -04001426 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1427 switch (sin->sa_family) {
1428 case AF_INET6:
1429 family = PF_INET6;
1430 break;
1431 case AF_INET:
1432 family = PF_INET;
1433 break;
1434 default:
1435 return ERR_PTR(-EINVAL);
1436 }
1437
1438 error = sock_create_kern(family, type, protocol, &sock);
Chuck Lever77f1f672007-02-12 00:53:39 -08001439 if (error < 0)
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001440 return ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441
Peter Zijlstraed075362006-12-06 20:35:24 -08001442 svc_reclassify_socket(sock);
1443
Trond Myklebustc69da772009-03-30 18:59:17 -04001444 /*
1445 * If this is an PF_INET6 listener, we want to avoid
1446 * getting requests from IPv4 remotes. Those should
1447 * be shunted to a PF_INET listener via rpcbind.
1448 */
1449 val = 1;
1450 if (family == PF_INET6)
1451 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1452 (char *)&val, sizeof(val));
1453
Eric Sesterhenn18114742006-09-28 14:37:07 -07001454 if (type == SOCK_STREAM)
Chuck Lever77f1f672007-02-12 00:53:39 -08001455 sock->sk->sk_reuse = 1; /* allow address reuse */
1456 error = kernel_bind(sock, sin, len);
Eric Sesterhenn18114742006-09-28 14:37:07 -07001457 if (error < 0)
1458 goto bummer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459
Tom Tucker9dbc2402007-12-30 21:08:12 -06001460 newlen = len;
1461 error = kernel_getsockname(sock, newsin, &newlen);
1462 if (error < 0)
1463 goto bummer;
1464
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 if (protocol == IPPROTO_TCP) {
Sridhar Samudralae6242e92006-08-07 20:58:01 -07001466 if ((error = kernel_listen(sock, 64)) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 goto bummer;
1468 }
1469
NeilBrowne79eff12007-02-12 00:53:30 -08001470 if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) {
Tom Tucker9dbc2402007-12-30 21:08:12 -06001471 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001472 return (struct svc_xprt *)svsk;
NeilBrowne79eff12007-02-12 00:53:30 -08001473 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474
1475bummer:
1476 dprintk("svc: svc_create_socket error = %d\n", -error);
1477 sock_release(sock);
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001478 return ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479}
1480
1481/*
Tom Tucker755ccea2007-12-30 21:07:27 -06001482 * Detach the svc_sock from the socket so that no
1483 * more callbacks occur.
1484 */
1485static void svc_sock_detach(struct svc_xprt *xprt)
1486{
1487 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1488 struct sock *sk = svsk->sk_sk;
1489
1490 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1491
1492 /* put back the old socket callbacks */
1493 sk->sk_state_change = svsk->sk_ostate;
1494 sk->sk_data_ready = svsk->sk_odata;
1495 sk->sk_write_space = svsk->sk_owspace;
Trond Myklebust69b6ba32008-12-23 16:30:11 -05001496
1497 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1498 wake_up_interruptible(sk->sk_sleep);
1499}
1500
1501/*
1502 * Disconnect the socket, and reset the callbacks
1503 */
1504static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1505{
1506 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1507
1508 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1509
1510 svc_sock_detach(xprt);
1511
1512 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags))
1513 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
Tom Tucker755ccea2007-12-30 21:07:27 -06001514}
1515
1516/*
1517 * Free the svc_sock's socket resources and the svc_sock itself.
1518 */
1519static void svc_sock_free(struct svc_xprt *xprt)
1520{
1521 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1522 dprintk("svc: svc_sock_free(%p)\n", svsk);
1523
Tom Tucker755ccea2007-12-30 21:07:27 -06001524 if (svsk->sk_sock->file)
1525 sockfd_put(svsk->sk_sock);
1526 else
1527 sock_release(svsk->sk_sock);
1528 kfree(svsk);
1529}
Benny Halevy7652e5a2009-04-01 09:23:09 -04001530
1531/*
1532 * Create a svc_xprt.
1533 *
1534 * For internal use only (e.g. nfsv4.1 backchannel).
1535 * Callers should typically use the xpo_create() method.
1536 */
1537struct svc_xprt *svc_sock_create(struct svc_serv *serv, int prot)
1538{
1539 struct svc_sock *svsk;
1540 struct svc_xprt *xprt = NULL;
1541
1542 dprintk("svc: %s\n", __func__);
1543 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1544 if (!svsk)
1545 goto out;
1546
1547 xprt = &svsk->sk_xprt;
1548 if (prot == IPPROTO_TCP)
1549 svc_xprt_init(&svc_tcp_class, xprt, serv);
1550 else if (prot == IPPROTO_UDP)
1551 svc_xprt_init(&svc_udp_class, xprt, serv);
1552 else
1553 BUG();
1554out:
1555 dprintk("svc: %s return %p\n", __func__, xprt);
1556 return xprt;
1557}
1558EXPORT_SYMBOL_GPL(svc_sock_create);
1559
1560/*
1561 * Destroy a svc_sock.
1562 */
1563void svc_sock_destroy(struct svc_xprt *xprt)
1564{
1565 if (xprt)
1566 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1567}
1568EXPORT_SYMBOL_GPL(svc_sock_destroy);