blob: 343a85b700f0fd91b11e01b0ba0cb2a0b345968e [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>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070041#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <asm/uaccess.h>
43#include <asm/ioctls.h>
44
45#include <linux/sunrpc/types.h>
Chuck Leverad06e4b2007-02-12 00:53:32 -080046#include <linux/sunrpc/clnt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <linux/sunrpc/xdr.h>
48#include <linux/sunrpc/svcsock.h>
49#include <linux/sunrpc/stats.h>
50
Tom Tucker360d87382007-12-30 21:07:17 -060051#define RPCDBG_FACILITY RPCDBG_SVCXPRT
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53
54static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
Chuck Lever6b174332007-02-12 00:53:28 -080055 int *errp, int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056static void svc_udp_data_ready(struct sock *, int);
57static int svc_udp_recvfrom(struct svc_rqst *);
58static int svc_udp_sendto(struct svc_rqst *);
Tom Tucker755ccea2007-12-30 21:07:27 -060059static void svc_sock_detach(struct svc_xprt *);
60static void svc_sock_free(struct svc_xprt *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Tom Tuckerb700cbb2007-12-30 21:07:42 -060062static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
63 struct sockaddr *, int, int);
Peter Zijlstraed075362006-12-06 20:35:24 -080064#ifdef CONFIG_DEBUG_LOCK_ALLOC
65static struct lock_class_key svc_key[2];
66static struct lock_class_key svc_slock_key[2];
67
Tom Tucker0f0257e2007-12-30 21:08:27 -060068static void svc_reclassify_socket(struct socket *sock)
Peter Zijlstraed075362006-12-06 20:35:24 -080069{
70 struct sock *sk = sock->sk;
John Heffner02b3d342007-09-12 10:42:12 +020071 BUG_ON(sock_owned_by_user(sk));
Peter Zijlstraed075362006-12-06 20:35:24 -080072 switch (sk->sk_family) {
73 case AF_INET:
74 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
Tom Tuckerdef13d72007-12-30 21:08:08 -060075 &svc_slock_key[0],
76 "sk_xprt.xpt_lock-AF_INET-NFSD",
77 &svc_key[0]);
Peter Zijlstraed075362006-12-06 20:35:24 -080078 break;
79
80 case AF_INET6:
81 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
Tom Tuckerdef13d72007-12-30 21:08:08 -060082 &svc_slock_key[1],
83 "sk_xprt.xpt_lock-AF_INET6-NFSD",
84 &svc_key[1]);
Peter Zijlstraed075362006-12-06 20:35:24 -080085 break;
86
87 default:
88 BUG();
89 }
90}
91#else
Tom Tucker0f0257e2007-12-30 21:08:27 -060092static void svc_reclassify_socket(struct socket *sock)
Peter Zijlstraed075362006-12-06 20:35:24 -080093{
94}
95#endif
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097/*
98 * Release an skbuff after use
99 */
Tom Tucker5148bf42007-12-30 21:07:25 -0600100static void svc_release_skb(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
Tom Tucker5148bf42007-12-30 21:07:25 -0600102 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 struct svc_deferred_req *dr = rqstp->rq_deferred;
104
105 if (skb) {
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600106 struct svc_sock *svsk =
107 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Tom Tucker5148bf42007-12-30 21:07:25 -0600108 rqstp->rq_xprt_ctxt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
110 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600111 skb_free_datagram(svsk->sk_sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 }
113 if (dr) {
114 rqstp->rq_deferred = NULL;
115 kfree(dr);
116 }
117}
118
Chuck Leverb92503b2007-02-12 00:53:36 -0800119union svc_pktinfo_u {
120 struct in_pktinfo pkti;
Chuck Leverb92503b2007-02-12 00:53:36 -0800121 struct in6_pktinfo pkti6;
Chuck Leverb92503b2007-02-12 00:53:36 -0800122};
David S. Millerbc375ea2007-04-12 13:35:59 -0700123#define SVC_PKTINFO_SPACE \
124 CMSG_SPACE(sizeof(union svc_pktinfo_u))
Chuck Leverb92503b2007-02-12 00:53:36 -0800125
126static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
127{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600128 struct svc_sock *svsk =
129 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
130 switch (svsk->sk_sk->sk_family) {
Chuck Leverb92503b2007-02-12 00:53:36 -0800131 case AF_INET: {
132 struct in_pktinfo *pki = CMSG_DATA(cmh);
133
134 cmh->cmsg_level = SOL_IP;
135 cmh->cmsg_type = IP_PKTINFO;
136 pki->ipi_ifindex = 0;
137 pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr;
138 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
139 }
140 break;
NeilBrown5a05ed72007-03-06 01:42:22 -0800141
Chuck Leverb92503b2007-02-12 00:53:36 -0800142 case AF_INET6: {
143 struct in6_pktinfo *pki = CMSG_DATA(cmh);
144
145 cmh->cmsg_level = SOL_IPV6;
146 cmh->cmsg_type = IPV6_PKTINFO;
147 pki->ipi6_ifindex = 0;
148 ipv6_addr_copy(&pki->ipi6_addr,
149 &rqstp->rq_daddr.addr6);
150 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
151 }
152 break;
Chuck Leverb92503b2007-02-12 00:53:36 -0800153 }
154 return;
155}
156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157/*
158 * Generic sendto routine
159 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600160static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600162 struct svc_sock *svsk =
163 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 struct socket *sock = svsk->sk_sock;
165 int slen;
David S. Millerbc375ea2007-04-12 13:35:59 -0700166 union {
167 struct cmsghdr hdr;
168 long all[SVC_PKTINFO_SPACE / sizeof(long)];
169 } buffer;
170 struct cmsghdr *cmh = &buffer.hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 int len = 0;
172 int result;
173 int size;
174 struct page **ppage = xdr->pages;
175 size_t base = xdr->page_base;
176 unsigned int pglen = xdr->page_len;
177 unsigned int flags = MSG_MORE;
Chuck Leverad06e4b2007-02-12 00:53:32 -0800178 char buf[RPC_MAX_ADDRBUFLEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180 slen = xdr->len;
181
182 if (rqstp->rq_prot == IPPROTO_UDP) {
Chuck Leverb92503b2007-02-12 00:53:36 -0800183 struct msghdr msg = {
184 .msg_name = &rqstp->rq_addr,
185 .msg_namelen = rqstp->rq_addrlen,
186 .msg_control = cmh,
187 .msg_controllen = sizeof(buffer),
188 .msg_flags = MSG_MORE,
189 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Chuck Leverb92503b2007-02-12 00:53:36 -0800191 svc_set_cmsg_data(rqstp, cmh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
193 if (sock_sendmsg(sock, &msg, 0) < 0)
194 goto out;
195 }
196
197 /* send head */
198 if (slen == xdr->head[0].iov_len)
199 flags = 0;
NeilBrown44524352006-10-04 02:15:46 -0700200 len = kernel_sendpage(sock, rqstp->rq_respages[0], 0,
201 xdr->head[0].iov_len, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 if (len != xdr->head[0].iov_len)
203 goto out;
204 slen -= xdr->head[0].iov_len;
205 if (slen == 0)
206 goto out;
207
208 /* send page data */
209 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
210 while (pglen > 0) {
211 if (slen == size)
212 flags = 0;
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700213 result = kernel_sendpage(sock, *ppage, base, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 if (result > 0)
215 len += result;
216 if (result != size)
217 goto out;
218 slen -= size;
219 pglen -= size;
220 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
221 base = 0;
222 ppage++;
223 }
224 /* send tail */
225 if (xdr->tail[0].iov_len) {
NeilBrown44524352006-10-04 02:15:46 -0700226 result = kernel_sendpage(sock, rqstp->rq_respages[0],
227 ((unsigned long)xdr->tail[0].iov_base)
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800228 & (PAGE_SIZE-1),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 xdr->tail[0].iov_len, 0);
230
231 if (result > 0)
232 len += result;
233 }
234out:
Chuck Leverad06e4b2007-02-12 00:53:32 -0800235 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600236 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
Chuck Leverad06e4b2007-02-12 00:53:32 -0800237 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239 return len;
240}
241
242/*
NeilBrown80212d52006-10-02 02:17:47 -0700243 * Report socket names for nfsdfs
244 */
245static int one_sock_name(char *buf, struct svc_sock *svsk)
246{
247 int len;
248
249 switch(svsk->sk_sk->sk_family) {
250 case AF_INET:
251 len = sprintf(buf, "ipv4 %s %u.%u.%u.%u %d\n",
252 svsk->sk_sk->sk_protocol==IPPROTO_UDP?
253 "udp" : "tcp",
254 NIPQUAD(inet_sk(svsk->sk_sk)->rcv_saddr),
255 inet_sk(svsk->sk_sk)->num);
256 break;
257 default:
258 len = sprintf(buf, "*unknown-%d*\n",
259 svsk->sk_sk->sk_family);
260 }
261 return len;
262}
263
264int
NeilBrownb41b66d2006-10-02 02:17:48 -0700265svc_sock_names(char *buf, struct svc_serv *serv, char *toclose)
NeilBrown80212d52006-10-02 02:17:47 -0700266{
NeilBrownb41b66d2006-10-02 02:17:48 -0700267 struct svc_sock *svsk, *closesk = NULL;
NeilBrown80212d52006-10-02 02:17:47 -0700268 int len = 0;
269
270 if (!serv)
271 return 0;
NeilBrownaaf68cf2007-02-08 14:20:30 -0800272 spin_lock_bh(&serv->sv_lock);
Tom Tucker7a182082007-12-30 21:07:53 -0600273 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
NeilBrown80212d52006-10-02 02:17:47 -0700274 int onelen = one_sock_name(buf+len, svsk);
NeilBrownb41b66d2006-10-02 02:17:48 -0700275 if (toclose && strcmp(toclose, buf+len) == 0)
276 closesk = svsk;
277 else
278 len += onelen;
NeilBrown80212d52006-10-02 02:17:47 -0700279 }
NeilBrownaaf68cf2007-02-08 14:20:30 -0800280 spin_unlock_bh(&serv->sv_lock);
NeilBrownb41b66d2006-10-02 02:17:48 -0700281 if (closesk)
NeilBrown5680c442006-10-04 02:15:45 -0700282 /* Should unregister with portmap, but you cannot
283 * unregister just one protocol...
284 */
Tom Tucker7a182082007-12-30 21:07:53 -0600285 svc_close_xprt(&closesk->sk_xprt);
NeilBrown37a03472006-10-04 02:15:44 -0700286 else if (toclose)
287 return -ENOENT;
NeilBrown80212d52006-10-02 02:17:47 -0700288 return len;
289}
290EXPORT_SYMBOL(svc_sock_names);
291
292/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 * Check input queue length
294 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600295static int svc_recv_available(struct svc_sock *svsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 struct socket *sock = svsk->sk_sock;
298 int avail, err;
299
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700300 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302 return (err >= 0)? avail : err;
303}
304
305/*
306 * Generic recvfrom routine.
307 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600308static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
309 int buflen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600311 struct svc_sock *svsk =
312 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Chuck Lever1ba95102007-02-12 00:53:31 -0800313 struct msghdr msg = {
314 .msg_flags = MSG_DONTWAIT,
315 };
316 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
Chuck Lever1ba95102007-02-12 00:53:31 -0800318 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
319 msg.msg_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
Chuck Lever1ba95102007-02-12 00:53:31 -0800322 svsk, iov[0].iov_base, iov[0].iov_len, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 return len;
324}
325
326/*
327 * Set socket snd and rcv buffer lengths
328 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600329static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
330 unsigned int rcv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331{
332#if 0
333 mm_segment_t oldfs;
334 oldfs = get_fs(); set_fs(KERNEL_DS);
335 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
336 (char*)&snd, sizeof(snd));
337 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
338 (char*)&rcv, sizeof(rcv));
339#else
340 /* sock_setsockopt limits use to sysctl_?mem_max,
341 * which isn't acceptable. Until that is made conditional
342 * on not having CAP_SYS_RESOURCE or similar, we go direct...
343 * DaveM said I could!
344 */
345 lock_sock(sock->sk);
346 sock->sk->sk_sndbuf = snd * 2;
347 sock->sk->sk_rcvbuf = rcv * 2;
348 sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
349 release_sock(sock->sk);
350#endif
351}
352/*
353 * INET callback when data has been received on the socket.
354 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600355static void svc_udp_data_ready(struct sock *sk, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356{
Neil Brown939bb7e2005-09-13 01:25:39 -0700357 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Neil Brown939bb7e2005-09-13 01:25:39 -0700359 if (svsk) {
360 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
Tom Tucker02fc6c32007-12-30 21:07:48 -0600361 svsk, sk, count,
362 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
363 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600364 svc_xprt_enqueue(&svsk->sk_xprt);
Neil Brown939bb7e2005-09-13 01:25:39 -0700365 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
367 wake_up_interruptible(sk->sk_sleep);
368}
369
370/*
371 * INET callback when space is newly available on the socket.
372 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600373static void svc_write_space(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374{
375 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
376
377 if (svsk) {
378 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
Tom Tucker02fc6c32007-12-30 21:07:48 -0600379 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
Tom Tuckerf6150c32007-12-30 21:07:57 -0600380 svc_xprt_enqueue(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 }
382
383 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) {
Neil Brown939bb7e2005-09-13 01:25:39 -0700384 dprintk("RPC svc_write_space: someone sleeping on %p\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 svsk);
386 wake_up_interruptible(sk->sk_sleep);
387 }
388}
389
Tom Tucker9dbc2402007-12-30 21:08:12 -0600390/*
391 * Copy the UDP datagram's destination address to the rqstp structure.
392 * The 'destination' address in this case is the address to which the
393 * peer sent the datagram, i.e. our local address. For multihomed
394 * hosts, this can change from msg to msg. Note that only the IP
395 * address changes, the port number should remain the same.
396 */
397static void svc_udp_get_dest_address(struct svc_rqst *rqstp,
398 struct cmsghdr *cmh)
Chuck Lever95756482007-02-12 00:53:38 -0800399{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600400 struct svc_sock *svsk =
401 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
402 switch (svsk->sk_sk->sk_family) {
Chuck Lever95756482007-02-12 00:53:38 -0800403 case AF_INET: {
NeilBrown7a37f572007-03-06 01:42:21 -0800404 struct in_pktinfo *pki = CMSG_DATA(cmh);
405 rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr;
Chuck Lever95756482007-02-12 00:53:38 -0800406 break;
NeilBrown7a37f572007-03-06 01:42:21 -0800407 }
Chuck Lever95756482007-02-12 00:53:38 -0800408 case AF_INET6: {
NeilBrown7a37f572007-03-06 01:42:21 -0800409 struct in6_pktinfo *pki = CMSG_DATA(cmh);
410 ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr);
Chuck Lever95756482007-02-12 00:53:38 -0800411 break;
NeilBrown7a37f572007-03-06 01:42:21 -0800412 }
Chuck Lever95756482007-02-12 00:53:38 -0800413 }
Chuck Lever95756482007-02-12 00:53:38 -0800414}
415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416/*
417 * Receive a datagram from a UDP socket.
418 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600419static int svc_udp_recvfrom(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600421 struct svc_sock *svsk =
422 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600423 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 struct sk_buff *skb;
David S. Millerbc375ea2007-04-12 13:35:59 -0700425 union {
426 struct cmsghdr hdr;
427 long all[SVC_PKTINFO_SPACE / sizeof(long)];
428 } buffer;
429 struct cmsghdr *cmh = &buffer.hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 int err, len;
NeilBrown7a37f572007-03-06 01:42:21 -0800431 struct msghdr msg = {
432 .msg_name = svc_addr(rqstp),
433 .msg_control = cmh,
434 .msg_controllen = sizeof(buffer),
435 .msg_flags = MSG_DONTWAIT,
436 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
Tom Tucker02fc6c32007-12-30 21:07:48 -0600438 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 /* udp sockets need large rcvbuf as all pending
440 * requests are still in that buffer. sndbuf must
441 * also be large enough that there is enough space
Greg Banks3262c812006-10-02 02:17:58 -0700442 * for one reply per thread. We count all threads
443 * rather than threads in a particular pool, which
444 * provides an upper bound on the number of threads
445 * which will access the socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 */
447 svc_sock_setbufsize(svsk->sk_sock,
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700448 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
449 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
Tom Tucker02fc6c32007-12-30 21:07:48 -0600451 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
NeilBrown05ed6902007-05-09 02:34:55 -0700452 skb = NULL;
453 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
454 0, 0, MSG_PEEK | MSG_DONTWAIT);
455 if (err >= 0)
456 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
457
458 if (skb == NULL) {
459 if (err != -EAGAIN) {
460 /* possibly an icmp error */
461 dprintk("svc: recvfrom returned error %d\n", -err);
Tom Tucker02fc6c32007-12-30 21:07:48 -0600462 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 }
Tom Tuckera6046f72007-12-30 21:08:01 -0600464 svc_xprt_received(&svsk->sk_xprt);
NeilBrown05ed6902007-05-09 02:34:55 -0700465 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 }
Tom Tucker9dbc2402007-12-30 21:08:12 -0600467 len = svc_addr_len(svc_addr(rqstp));
468 if (len < 0)
469 return len;
470 rqstp->rq_addrlen = len;
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700471 if (skb->tstamp.tv64 == 0) {
472 skb->tstamp = ktime_get_real();
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800473 /* Don't enable netstamp, sunrpc doesn't
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 need that much accuracy */
475 }
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700476 svsk->sk_sk->sk_stamp = skb->tstamp;
Tom Tucker02fc6c32007-12-30 21:07:48 -0600477 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
479 /*
480 * Maybe more packets - kick another thread ASAP.
481 */
Tom Tuckera6046f72007-12-30 21:08:01 -0600482 svc_xprt_received(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 len = skb->len - sizeof(struct udphdr);
485 rqstp->rq_arg.len = len;
486
Chuck Lever95756482007-02-12 00:53:38 -0800487 rqstp->rq_prot = IPPROTO_UDP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
NeilBrown7a37f572007-03-06 01:42:21 -0800489 if (cmh->cmsg_level != IPPROTO_IP ||
490 cmh->cmsg_type != IP_PKTINFO) {
491 if (net_ratelimit())
492 printk("rpcsvc: received unknown control message:"
493 "%d/%d\n",
494 cmh->cmsg_level, cmh->cmsg_type);
495 skb_free_datagram(svsk->sk_sk, skb);
496 return 0;
497 }
498 svc_udp_get_dest_address(rqstp, cmh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 if (skb_is_nonlinear(skb)) {
501 /* we have to copy */
502 local_bh_disable();
503 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
504 local_bh_enable();
505 /* checksum error */
506 skb_free_datagram(svsk->sk_sk, skb);
507 return 0;
508 }
509 local_bh_enable();
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800510 skb_free_datagram(svsk->sk_sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 } else {
512 /* we can use it in-place */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600513 rqstp->rq_arg.head[0].iov_base = skb->data +
514 sizeof(struct udphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 rqstp->rq_arg.head[0].iov_len = len;
Herbert Xufb286bb2005-11-10 13:01:24 -0800516 if (skb_checksum_complete(skb)) {
517 skb_free_datagram(svsk->sk_sk, skb);
518 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 }
Tom Tucker5148bf42007-12-30 21:07:25 -0600520 rqstp->rq_xprt_ctxt = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 }
522
523 rqstp->rq_arg.page_base = 0;
524 if (len <= rqstp->rq_arg.head[0].iov_len) {
525 rqstp->rq_arg.head[0].iov_len = len;
526 rqstp->rq_arg.page_len = 0;
NeilBrown44524352006-10-04 02:15:46 -0700527 rqstp->rq_respages = rqstp->rq_pages+1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 } else {
529 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
NeilBrown44524352006-10-04 02:15:46 -0700530 rqstp->rq_respages = rqstp->rq_pages + 1 +
Ilpo Järvinen172589c2007-08-28 15:50:33 -0700531 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 }
533
534 if (serv->sv_stats)
535 serv->sv_stats->netudpcnt++;
536
537 return len;
538}
539
540static int
541svc_udp_sendto(struct svc_rqst *rqstp)
542{
543 int error;
544
545 error = svc_sendto(rqstp, &rqstp->rq_res);
546 if (error == -ECONNREFUSED)
547 /* ICMP error on earlier request. */
548 error = svc_sendto(rqstp, &rqstp->rq_res);
549
550 return error;
551}
552
Tom Tuckere831fe62007-12-30 21:07:29 -0600553static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
554{
555}
556
Tom Tucker323bee32007-12-30 21:07:31 -0600557static int svc_udp_has_wspace(struct svc_xprt *xprt)
558{
559 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600560 struct svc_serv *serv = xprt->xpt_server;
Tom Tucker323bee32007-12-30 21:07:31 -0600561 unsigned long required;
562
563 /*
564 * Set the SOCK_NOSPACE flag before checking the available
565 * sock space.
566 */
567 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
Tom Tucker7a90e8c2007-12-30 21:07:55 -0600568 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
Tom Tucker323bee32007-12-30 21:07:31 -0600569 if (required*2 > sock_wspace(svsk->sk_sk))
570 return 0;
571 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
572 return 1;
573}
574
Tom Tucker38a417c2007-12-30 21:07:36 -0600575static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
576{
577 BUG();
578 return NULL;
579}
580
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600581static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
582 struct sockaddr *sa, int salen,
583 int flags)
584{
585 return svc_create_socket(serv, IPPROTO_UDP, sa, salen, flags);
586}
587
Tom Tucker360d87382007-12-30 21:07:17 -0600588static struct svc_xprt_ops svc_udp_ops = {
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600589 .xpo_create = svc_udp_create,
Tom Tucker5d137992007-12-30 21:07:23 -0600590 .xpo_recvfrom = svc_udp_recvfrom,
591 .xpo_sendto = svc_udp_sendto,
Tom Tucker5148bf42007-12-30 21:07:25 -0600592 .xpo_release_rqst = svc_release_skb,
Tom Tucker755ccea2007-12-30 21:07:27 -0600593 .xpo_detach = svc_sock_detach,
594 .xpo_free = svc_sock_free,
Tom Tuckere831fe62007-12-30 21:07:29 -0600595 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
Tom Tucker323bee32007-12-30 21:07:31 -0600596 .xpo_has_wspace = svc_udp_has_wspace,
Tom Tucker38a417c2007-12-30 21:07:36 -0600597 .xpo_accept = svc_udp_accept,
Tom Tucker360d87382007-12-30 21:07:17 -0600598};
599
600static struct svc_xprt_class svc_udp_class = {
601 .xcl_name = "udp",
Tom Tuckerb700cbb2007-12-30 21:07:42 -0600602 .xcl_owner = THIS_MODULE,
Tom Tucker360d87382007-12-30 21:07:17 -0600603 .xcl_ops = &svc_udp_ops,
Tom Tucker49023152007-12-30 21:07:21 -0600604 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
Tom Tucker360d87382007-12-30 21:07:17 -0600605};
606
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600607static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608{
NeilBrown7a37f572007-03-06 01:42:21 -0800609 int one = 1;
610 mm_segment_t oldfs;
611
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600612 svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv);
Tom Tuckerdef13d72007-12-30 21:08:08 -0600613 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
615 svsk->sk_sk->sk_write_space = svc_write_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
617 /* initialise setting must have enough space to
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800618 * receive and respond to one request.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 * svc_udp_recvfrom will re-adjust if necessary
620 */
621 svc_sock_setbufsize(svsk->sk_sock,
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600622 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
623 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
Tom Tucker0f0257e2007-12-30 21:08:27 -0600625 /* data might have come in before data_ready set up */
626 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Tom Tucker02fc6c32007-12-30 21:07:48 -0600627 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
NeilBrown7a37f572007-03-06 01:42:21 -0800628
629 oldfs = get_fs();
630 set_fs(KERNEL_DS);
631 /* make sure we get destination address info */
632 svsk->sk_sock->ops->setsockopt(svsk->sk_sock, IPPROTO_IP, IP_PKTINFO,
633 (char __user *)&one, sizeof(one));
634 set_fs(oldfs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635}
636
637/*
638 * A data_ready event on a listening socket means there's a connection
639 * pending. Do not use state_change as a substitute for it.
640 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600641static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642{
Neil Brown939bb7e2005-09-13 01:25:39 -0700643 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
645 dprintk("svc: socket %p TCP (listen) state change %d\n",
Neil Brown939bb7e2005-09-13 01:25:39 -0700646 sk, sk->sk_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647
Neil Brown939bb7e2005-09-13 01:25:39 -0700648 /*
649 * This callback may called twice when a new connection
650 * is established as a child socket inherits everything
651 * from a parent LISTEN socket.
652 * 1) data_ready method of the parent socket will be called
653 * when one of child sockets become ESTABLISHED.
654 * 2) data_ready method of the child socket may be called
655 * when it receives data before the socket is accepted.
656 * In case of 2, we should ignore it silently.
657 */
658 if (sk->sk_state == TCP_LISTEN) {
659 if (svsk) {
Tom Tucker02fc6c32007-12-30 21:07:48 -0600660 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600661 svc_xprt_enqueue(&svsk->sk_xprt);
Neil Brown939bb7e2005-09-13 01:25:39 -0700662 } else
663 printk("svc: socket %p: no user data\n", sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 }
Neil Brown939bb7e2005-09-13 01:25:39 -0700665
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
667 wake_up_interruptible_all(sk->sk_sleep);
668}
669
670/*
671 * A state change on a connected socket means it's dying or dead.
672 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600673static void svc_tcp_state_change(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674{
Neil Brown939bb7e2005-09-13 01:25:39 -0700675 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
677 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
Neil Brown939bb7e2005-09-13 01:25:39 -0700678 sk, sk->sk_state, sk->sk_user_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
Neil Brown939bb7e2005-09-13 01:25:39 -0700680 if (!svsk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 printk("svc: socket %p: no user data\n", sk);
Neil Brown939bb7e2005-09-13 01:25:39 -0700682 else {
Tom Tucker02fc6c32007-12-30 21:07:48 -0600683 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600684 svc_xprt_enqueue(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
687 wake_up_interruptible_all(sk->sk_sleep);
688}
689
Tom Tucker0f0257e2007-12-30 21:08:27 -0600690static void svc_tcp_data_ready(struct sock *sk, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691{
Neil Brown939bb7e2005-09-13 01:25:39 -0700692 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693
694 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
Neil Brown939bb7e2005-09-13 01:25:39 -0700695 sk, sk->sk_user_data);
696 if (svsk) {
Tom Tucker02fc6c32007-12-30 21:07:48 -0600697 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600698 svc_xprt_enqueue(&svsk->sk_xprt);
Neil Brown939bb7e2005-09-13 01:25:39 -0700699 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
701 wake_up_interruptible(sk->sk_sleep);
702}
703
704/*
705 * Accept a TCP connection
706 */
Tom Tucker38a417c2007-12-30 21:07:36 -0600707static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708{
Tom Tucker38a417c2007-12-30 21:07:36 -0600709 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800710 struct sockaddr_storage addr;
711 struct sockaddr *sin = (struct sockaddr *) &addr;
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600712 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 struct socket *sock = svsk->sk_sock;
714 struct socket *newsock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 struct svc_sock *newsvsk;
716 int err, slen;
Chuck Leverad06e4b2007-02-12 00:53:32 -0800717 char buf[RPC_MAX_ADDRBUFLEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718
719 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
720 if (!sock)
Tom Tucker38a417c2007-12-30 21:07:36 -0600721 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
Tom Tucker02fc6c32007-12-30 21:07:48 -0600723 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700724 err = kernel_accept(sock, &newsock, O_NONBLOCK);
725 if (err < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 if (err == -ENOMEM)
727 printk(KERN_WARNING "%s: no more sockets!\n",
728 serv->sv_name);
Sridhar Samudralae6242e92006-08-07 20:58:01 -0700729 else if (err != -EAGAIN && net_ratelimit())
730 printk(KERN_WARNING "%s: accept failed (err %d)!\n",
731 serv->sv_name, -err);
Tom Tucker38a417c2007-12-30 21:07:36 -0600732 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 }
Tom Tucker02fc6c32007-12-30 21:07:48 -0600734 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800736 err = kernel_getpeername(newsock, sin, &slen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 if (err < 0) {
738 if (net_ratelimit())
739 printk(KERN_WARNING "%s: peername failed (err %d)!\n",
740 serv->sv_name, -err);
741 goto failed; /* aborted connection or whatever */
742 }
743
744 /* Ideally, we would want to reject connections from unauthorized
Chuck Leverad06e4b2007-02-12 00:53:32 -0800745 * hosts here, but when we get encryption, the IP of the host won't
746 * tell us anything. For now just warn about unpriv connections.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 */
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800748 if (!svc_port_is_privileged(sin)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 dprintk(KERN_WARNING
Chuck Leverad06e4b2007-02-12 00:53:32 -0800750 "%s: connect from unprivileged port: %s\n",
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800751 serv->sv_name,
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800752 __svc_print_addr(sin, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 }
Chuck Leverad06e4b2007-02-12 00:53:32 -0800754 dprintk("%s: connect from %s\n", serv->sv_name,
akpm@linux-foundation.orgcdd88b92007-02-12 00:53:38 -0800755 __svc_print_addr(sin, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
757 /* make sure that a write doesn't block forever when
758 * low on memory
759 */
760 newsock->sk->sk_sndtimeo = HZ*30;
761
Chuck Lever6b174332007-02-12 00:53:28 -0800762 if (!(newsvsk = svc_setup_socket(serv, newsock, &err,
763 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 goto failed;
Tom Tucker9dbc2402007-12-30 21:08:12 -0600765 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
Frank van Maarseveena9747692007-07-09 22:21:39 +0200766 err = kernel_getsockname(newsock, sin, &slen);
767 if (unlikely(err < 0)) {
768 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
769 slen = offsetof(struct sockaddr, sa_data);
770 }
Tom Tucker9dbc2402007-12-30 21:08:12 -0600771 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
Chuck Lever067d7812007-02-12 00:53:30 -0800772
Tom Tuckerf9f3cc42007-12-30 21:07:40 -0600773 if (serv->sv_stats)
774 serv->sv_stats->nettcpconn++;
775
776 return &newsvsk->sk_xprt;
777
778failed:
779 sock_release(newsock);
780 return NULL;
781}
782
783/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 * Receive data from a TCP socket.
785 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600786static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600788 struct svc_sock *svsk =
789 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600790 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 int len;
NeilBrown3cc03b12006-10-04 02:15:47 -0700792 struct kvec *vec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 int pnum, vlen;
794
795 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
Tom Tucker02fc6c32007-12-30 21:07:48 -0600796 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
797 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
798 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
Tom Tucker02fc6c32007-12-30 21:07:48 -0600800 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 /* sndbuf needs to have room for one request
802 * per thread, otherwise we can stall even when the
803 * network isn't a bottleneck.
Greg Banks3262c812006-10-02 02:17:58 -0700804 *
805 * We count all threads rather than threads in a
806 * particular pool, which provides an upper bound
807 * on the number of threads which will access the socket.
808 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 * rcvbuf just needs to be able to hold a few requests.
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800810 * Normally they will be removed from the queue
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 * as soon a a complete request arrives.
812 */
813 svc_sock_setbufsize(svsk->sk_sock,
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700814 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
815 3 * serv->sv_max_mesg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816
Tom Tucker02fc6c32007-12-30 21:07:48 -0600817 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818
819 /* Receive data. If we haven't got the record length yet, get
820 * the next four bytes. Otherwise try to gobble up as much as
821 * possible up to the complete record length.
822 */
823 if (svsk->sk_tcplen < 4) {
824 unsigned long want = 4 - svsk->sk_tcplen;
825 struct kvec iov;
826
827 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
828 iov.iov_len = want;
829 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
830 goto error;
831 svsk->sk_tcplen += len;
832
833 if (len < want) {
834 dprintk("svc: short recvfrom while reading record length (%d of %lu)\n",
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800835 len, want);
Tom Tuckera6046f72007-12-30 21:08:01 -0600836 svc_xprt_received(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 return -EAGAIN; /* record header not complete */
838 }
839
840 svsk->sk_reclen = ntohl(svsk->sk_reclen);
841 if (!(svsk->sk_reclen & 0x80000000)) {
842 /* FIXME: technically, a record can be fragmented,
843 * and non-terminal fragments will not have the top
844 * bit set in the fragment length header.
845 * But apparently no known nfs clients send fragmented
846 * records. */
NeilBrown34e9a632007-01-29 13:19:52 -0800847 if (net_ratelimit())
848 printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx"
849 " (non-terminal)\n",
850 (unsigned long) svsk->sk_reclen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 goto err_delete;
852 }
853 svsk->sk_reclen &= 0x7fffffff;
854 dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700855 if (svsk->sk_reclen > serv->sv_max_mesg) {
NeilBrown34e9a632007-01-29 13:19:52 -0800856 if (net_ratelimit())
857 printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx"
858 " (large)\n",
859 (unsigned long) svsk->sk_reclen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 goto err_delete;
861 }
862 }
863
864 /* Check whether enough data is available */
865 len = svc_recv_available(svsk);
866 if (len < 0)
867 goto error;
868
869 if (len < svsk->sk_reclen) {
870 dprintk("svc: incomplete TCP record (%d of %d)\n",
871 len, svsk->sk_reclen);
Tom Tuckera6046f72007-12-30 21:08:01 -0600872 svc_xprt_received(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 return -EAGAIN; /* record not complete */
874 }
875 len = svsk->sk_reclen;
Tom Tucker02fc6c32007-12-30 21:07:48 -0600876 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
NeilBrown3cc03b12006-10-04 02:15:47 -0700878 vec = rqstp->rq_vec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 vec[0] = rqstp->rq_arg.head[0];
880 vlen = PAGE_SIZE;
881 pnum = 1;
882 while (vlen < len) {
NeilBrown44524352006-10-04 02:15:46 -0700883 vec[pnum].iov_base = page_address(rqstp->rq_pages[pnum]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 vec[pnum].iov_len = PAGE_SIZE;
885 pnum++;
886 vlen += PAGE_SIZE;
887 }
NeilBrown44524352006-10-04 02:15:46 -0700888 rqstp->rq_respages = &rqstp->rq_pages[pnum];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
890 /* Now receive data */
891 len = svc_recvfrom(rqstp, vec, pnum, len);
892 if (len < 0)
893 goto error;
894
895 dprintk("svc: TCP complete record (%d bytes)\n", len);
896 rqstp->rq_arg.len = len;
897 rqstp->rq_arg.page_base = 0;
898 if (len <= rqstp->rq_arg.head[0].iov_len) {
899 rqstp->rq_arg.head[0].iov_len = len;
900 rqstp->rq_arg.page_len = 0;
901 } else {
902 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
903 }
904
Tom Tucker5148bf42007-12-30 21:07:25 -0600905 rqstp->rq_xprt_ctxt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 rqstp->rq_prot = IPPROTO_TCP;
907
908 /* Reset TCP read info */
909 svsk->sk_reclen = 0;
910 svsk->sk_tcplen = 0;
911
Tom Tucker9dbc2402007-12-30 21:08:12 -0600912 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
Tom Tuckera6046f72007-12-30 21:08:01 -0600913 svc_xprt_received(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 if (serv->sv_stats)
915 serv->sv_stats->nettcpcnt++;
916
917 return len;
918
919 err_delete:
Tom Tucker02fc6c32007-12-30 21:07:48 -0600920 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 return -EAGAIN;
922
923 error:
924 if (len == -EAGAIN) {
925 dprintk("RPC: TCP recvfrom got EAGAIN\n");
Tom Tuckera6046f72007-12-30 21:08:01 -0600926 svc_xprt_received(&svsk->sk_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 } else {
928 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600929 svsk->sk_xprt.xpt_server->sv_name, -len);
Olaf Kirch93fbf1a2006-01-06 00:19:56 -0800930 goto err_delete;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 }
932
933 return len;
934}
935
936/*
937 * Send out data on TCP socket.
938 */
Tom Tucker0f0257e2007-12-30 21:08:27 -0600939static int svc_tcp_sendto(struct svc_rqst *rqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940{
941 struct xdr_buf *xbufp = &rqstp->rq_res;
942 int sent;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -0700943 __be32 reclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944
945 /* Set up the first element of the reply kvec.
946 * Any other kvecs that may be in use have been taken
947 * care of by the server implementation itself.
948 */
949 reclen = htonl(0x80000000|((xbufp->len ) - 4));
950 memcpy(xbufp->head[0].iov_base, &reclen, 4);
951
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600952 if (test_bit(XPT_DEAD, &rqstp->rq_xprt->xpt_flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 return -ENOTCONN;
954
955 sent = svc_sendto(rqstp, &rqstp->rq_res);
956 if (sent != xbufp->len) {
Tom Tucker0f0257e2007-12-30 21:08:27 -0600957 printk(KERN_NOTICE
958 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
959 "- shutting down socket\n",
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600960 rqstp->rq_xprt->xpt_server->sv_name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 (sent<0)?"got error":"sent only",
962 sent, xbufp->len);
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600963 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
Tom Tuckerf6150c32007-12-30 21:07:57 -0600964 svc_xprt_enqueue(rqstp->rq_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 sent = -EAGAIN;
966 }
967 return sent;
968}
969
Tom Tuckere831fe62007-12-30 21:07:29 -0600970/*
971 * Setup response header. TCP has a 4B record length field.
972 */
973static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
974{
975 struct kvec *resv = &rqstp->rq_res.head[0];
976
977 /* tcp needs a space for the record length... */
978 svc_putnl(resv, 0);
979}
980
Tom Tucker323bee32007-12-30 21:07:31 -0600981static int svc_tcp_has_wspace(struct svc_xprt *xprt)
982{
Tom Tucker57b1d3b2007-12-30 21:08:22 -0600983 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
Tom Tuckerbb5cf162007-12-30 21:07:50 -0600984 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
Tom Tucker323bee32007-12-30 21:07:31 -0600985 int required;
986 int wspace;
987
988 /*
989 * Set the SOCK_NOSPACE flag before checking the available
990 * sock space.
991 */
992 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
Tom Tucker7a90e8c2007-12-30 21:07:55 -0600993 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
Tom Tucker323bee32007-12-30 21:07:31 -0600994 wspace = sk_stream_wspace(svsk->sk_sk);
995
996 if (wspace < sk_stream_min_wspace(svsk->sk_sk))
997 return 0;
998 if (required * 2 > wspace)
999 return 0;
1000
1001 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
1002 return 1;
1003}
1004
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001005static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1006 struct sockaddr *sa, int salen,
1007 int flags)
1008{
1009 return svc_create_socket(serv, IPPROTO_TCP, sa, salen, flags);
1010}
1011
Tom Tucker360d87382007-12-30 21:07:17 -06001012static struct svc_xprt_ops svc_tcp_ops = {
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001013 .xpo_create = svc_tcp_create,
Tom Tucker5d137992007-12-30 21:07:23 -06001014 .xpo_recvfrom = svc_tcp_recvfrom,
1015 .xpo_sendto = svc_tcp_sendto,
Tom Tucker5148bf42007-12-30 21:07:25 -06001016 .xpo_release_rqst = svc_release_skb,
Tom Tucker755ccea2007-12-30 21:07:27 -06001017 .xpo_detach = svc_sock_detach,
1018 .xpo_free = svc_sock_free,
Tom Tuckere831fe62007-12-30 21:07:29 -06001019 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
Tom Tucker323bee32007-12-30 21:07:31 -06001020 .xpo_has_wspace = svc_tcp_has_wspace,
Tom Tucker38a417c2007-12-30 21:07:36 -06001021 .xpo_accept = svc_tcp_accept,
Tom Tucker360d87382007-12-30 21:07:17 -06001022};
1023
1024static struct svc_xprt_class svc_tcp_class = {
1025 .xcl_name = "tcp",
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001026 .xcl_owner = THIS_MODULE,
Tom Tucker360d87382007-12-30 21:07:17 -06001027 .xcl_ops = &svc_tcp_ops,
Tom Tucker49023152007-12-30 21:07:21 -06001028 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
Tom Tucker360d87382007-12-30 21:07:17 -06001029};
1030
1031void svc_init_xprt_sock(void)
1032{
1033 svc_reg_xprt_class(&svc_tcp_class);
1034 svc_reg_xprt_class(&svc_udp_class);
1035}
1036
1037void svc_cleanup_xprt_sock(void)
1038{
1039 svc_unreg_xprt_class(&svc_tcp_class);
1040 svc_unreg_xprt_class(&svc_udp_class);
1041}
1042
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001043static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044{
1045 struct sock *sk = svsk->sk_sk;
1046 struct tcp_sock *tp = tcp_sk(sk);
1047
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001048 svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv);
Tom Tuckerdef13d72007-12-30 21:08:08 -06001049 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 if (sk->sk_state == TCP_LISTEN) {
1051 dprintk("setting up TCP socket for listening\n");
Tom Tucker02fc6c32007-12-30 21:07:48 -06001052 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 sk->sk_data_ready = svc_tcp_listen_data_ready;
Tom Tucker02fc6c32007-12-30 21:07:48 -06001054 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 } else {
1056 dprintk("setting up TCP socket for reading\n");
1057 sk->sk_state_change = svc_tcp_state_change;
1058 sk->sk_data_ready = svc_tcp_data_ready;
1059 sk->sk_write_space = svc_write_space;
1060
1061 svsk->sk_reclen = 0;
1062 svsk->sk_tcplen = 0;
1063
1064 tp->nonagle = 1; /* disable Nagle's algorithm */
1065
1066 /* initialise setting must have enough space to
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001067 * receive and respond to one request.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 * svc_tcp_recvfrom will re-adjust if necessary
1069 */
1070 svc_sock_setbufsize(svsk->sk_sock,
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001071 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
1072 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073
Tom Tucker02fc6c32007-12-30 21:07:48 -06001074 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1075 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001076 if (sk->sk_state != TCP_ESTABLISHED)
Tom Tucker02fc6c32007-12-30 21:07:48 -06001077 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 }
1079}
1080
Tom Tucker0f0257e2007-12-30 21:08:27 -06001081void svc_sock_update_bufs(struct svc_serv *serv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082{
1083 /*
1084 * The number of server threads has changed. Update
1085 * rcvbuf and sndbuf accordingly on all sockets
1086 */
1087 struct list_head *le;
1088
1089 spin_lock_bh(&serv->sv_lock);
1090 list_for_each(le, &serv->sv_permsocks) {
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001091 struct svc_sock *svsk =
Tom Tucker7a182082007-12-30 21:07:53 -06001092 list_entry(le, struct svc_sock, sk_xprt.xpt_list);
Tom Tucker02fc6c32007-12-30 21:07:48 -06001093 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 }
1095 list_for_each(le, &serv->sv_tempsocks) {
1096 struct svc_sock *svsk =
Tom Tucker7a182082007-12-30 21:07:53 -06001097 list_entry(le, struct svc_sock, sk_xprt.xpt_list);
Tom Tucker02fc6c32007-12-30 21:07:48 -06001098 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 }
1100 spin_unlock_bh(&serv->sv_lock);
1101}
1102
1103/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 * Initialize socket for RPC use and create svc_sock struct
1105 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
1106 */
Chuck Lever6b174332007-02-12 00:53:28 -08001107static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1108 struct socket *sock,
1109 int *errp, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110{
1111 struct svc_sock *svsk;
1112 struct sock *inet;
Chuck Lever6b174332007-02-12 00:53:28 -08001113 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114
1115 dprintk("svc: svc_setup_socket %p\n", sock);
Panagiotis Issaris0da974f2006-07-21 14:51:30 -07001116 if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 *errp = -ENOMEM;
1118 return NULL;
1119 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120
1121 inet = sock->sk;
1122
1123 /* Register socket with portmapper */
1124 if (*errp >= 0 && pmap_register)
1125 *errp = svc_register(serv, inet->sk_protocol,
1126 ntohs(inet_sk(inet)->sport));
1127
1128 if (*errp < 0) {
1129 kfree(svsk);
1130 return NULL;
1131 }
1132
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 inet->sk_user_data = svsk;
1134 svsk->sk_sock = sock;
1135 svsk->sk_sk = inet;
1136 svsk->sk_ostate = inet->sk_state_change;
1137 svsk->sk_odata = inet->sk_data_ready;
1138 svsk->sk_owspace = inet->sk_write_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139
1140 /* Initialize the socket */
1141 if (sock->type == SOCK_DGRAM)
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001142 svc_udp_init(svsk, serv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 else
Tom Tuckerbb5cf162007-12-30 21:07:50 -06001144 svc_tcp_init(svsk, serv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1147 svsk, svsk->sk_sk);
1148
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 return svsk;
1150}
1151
NeilBrownb41b66d2006-10-02 02:17:48 -07001152int svc_addsock(struct svc_serv *serv,
1153 int fd,
1154 char *name_return,
1155 int *proto)
1156{
1157 int err = 0;
1158 struct socket *so = sockfd_lookup(fd, &err);
1159 struct svc_sock *svsk = NULL;
1160
1161 if (!so)
1162 return err;
1163 if (so->sk->sk_family != AF_INET)
1164 err = -EAFNOSUPPORT;
1165 else if (so->sk->sk_protocol != IPPROTO_TCP &&
1166 so->sk->sk_protocol != IPPROTO_UDP)
1167 err = -EPROTONOSUPPORT;
1168 else if (so->state > SS_UNCONNECTED)
1169 err = -EISCONN;
1170 else {
Chuck Lever6b174332007-02-12 00:53:28 -08001171 svsk = svc_setup_socket(serv, so, &err, SVC_SOCK_DEFAULTS);
NeilBrowne79eff12007-02-12 00:53:30 -08001172 if (svsk) {
Tom Tucker9dbc2402007-12-30 21:08:12 -06001173 struct sockaddr_storage addr;
1174 struct sockaddr *sin = (struct sockaddr *)&addr;
1175 int salen;
1176 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1177 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
Tom Tucker4e5caaa2007-12-30 21:08:20 -06001178 clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
1179 spin_lock_bh(&serv->sv_lock);
1180 list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks);
1181 spin_unlock_bh(&serv->sv_lock);
Tom Tuckera6046f72007-12-30 21:08:01 -06001182 svc_xprt_received(&svsk->sk_xprt);
NeilBrownb41b66d2006-10-02 02:17:48 -07001183 err = 0;
NeilBrowne79eff12007-02-12 00:53:30 -08001184 }
NeilBrownb41b66d2006-10-02 02:17:48 -07001185 }
1186 if (err) {
1187 sockfd_put(so);
1188 return err;
1189 }
1190 if (proto) *proto = so->sk->sk_protocol;
1191 return one_sock_name(name_return, svsk);
1192}
1193EXPORT_SYMBOL_GPL(svc_addsock);
1194
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195/*
1196 * Create socket for RPC service.
1197 */
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001198static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1199 int protocol,
1200 struct sockaddr *sin, int len,
1201 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202{
1203 struct svc_sock *svsk;
1204 struct socket *sock;
1205 int error;
1206 int type;
Chuck Leverad06e4b2007-02-12 00:53:32 -08001207 char buf[RPC_MAX_ADDRBUFLEN];
Tom Tucker9dbc2402007-12-30 21:08:12 -06001208 struct sockaddr_storage addr;
1209 struct sockaddr *newsin = (struct sockaddr *)&addr;
1210 int newlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211
Chuck Leverad06e4b2007-02-12 00:53:32 -08001212 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1213 serv->sv_program->pg_name, protocol,
Chuck Lever77f1f672007-02-12 00:53:39 -08001214 __svc_print_addr(sin, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215
1216 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1217 printk(KERN_WARNING "svc: only UDP and TCP "
1218 "sockets supported\n");
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001219 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 }
1221 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1222
Chuck Lever77f1f672007-02-12 00:53:39 -08001223 error = sock_create_kern(sin->sa_family, type, protocol, &sock);
1224 if (error < 0)
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001225 return ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226
Peter Zijlstraed075362006-12-06 20:35:24 -08001227 svc_reclassify_socket(sock);
1228
Eric Sesterhenn18114742006-09-28 14:37:07 -07001229 if (type == SOCK_STREAM)
Chuck Lever77f1f672007-02-12 00:53:39 -08001230 sock->sk->sk_reuse = 1; /* allow address reuse */
1231 error = kernel_bind(sock, sin, len);
Eric Sesterhenn18114742006-09-28 14:37:07 -07001232 if (error < 0)
1233 goto bummer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234
Tom Tucker9dbc2402007-12-30 21:08:12 -06001235 newlen = len;
1236 error = kernel_getsockname(sock, newsin, &newlen);
1237 if (error < 0)
1238 goto bummer;
1239
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 if (protocol == IPPROTO_TCP) {
Sridhar Samudralae6242e92006-08-07 20:58:01 -07001241 if ((error = kernel_listen(sock, 64)) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 goto bummer;
1243 }
1244
NeilBrowne79eff12007-02-12 00:53:30 -08001245 if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) {
Tom Tucker9dbc2402007-12-30 21:08:12 -06001246 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001247 return (struct svc_xprt *)svsk;
NeilBrowne79eff12007-02-12 00:53:30 -08001248 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249
1250bummer:
1251 dprintk("svc: svc_create_socket error = %d\n", -error);
1252 sock_release(sock);
Tom Tuckerb700cbb2007-12-30 21:07:42 -06001253 return ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254}
1255
1256/*
Tom Tucker755ccea2007-12-30 21:07:27 -06001257 * Detach the svc_sock from the socket so that no
1258 * more callbacks occur.
1259 */
1260static void svc_sock_detach(struct svc_xprt *xprt)
1261{
1262 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1263 struct sock *sk = svsk->sk_sk;
1264
1265 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1266
1267 /* put back the old socket callbacks */
1268 sk->sk_state_change = svsk->sk_ostate;
1269 sk->sk_data_ready = svsk->sk_odata;
1270 sk->sk_write_space = svsk->sk_owspace;
1271}
1272
1273/*
1274 * Free the svc_sock's socket resources and the svc_sock itself.
1275 */
1276static void svc_sock_free(struct svc_xprt *xprt)
1277{
1278 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1279 dprintk("svc: svc_sock_free(%p)\n", svsk);
1280
Tom Tucker755ccea2007-12-30 21:07:27 -06001281 if (svsk->sk_sock->file)
1282 sockfd_put(svsk->sk_sock);
1283 else
1284 sock_release(svsk->sk_sock);
1285 kfree(svsk);
1286}