Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
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 | |
f6150c3c | 8 | * svc_xprt_enqueue procedure... |
1da177e4 LT |
9 | * |
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 | ||
172589cc | 22 | #include <linux/kernel.h> |
1da177e4 | 23 | #include <linux/sched.h> |
3a9a231d | 24 | #include <linux/module.h> |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/fcntl.h> | |
27 | #include <linux/net.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/inet.h> | |
30 | #include <linux/udp.h> | |
91483c4b | 31 | #include <linux/tcp.h> |
1da177e4 LT |
32 | #include <linux/unistd.h> |
33 | #include <linux/slab.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/skbuff.h> | |
b41b66d6 | 36 | #include <linux/file.h> |
7dfb7103 | 37 | #include <linux/freezer.h> |
1da177e4 LT |
38 | #include <net/sock.h> |
39 | #include <net/checksum.h> | |
40 | #include <net/ip.h> | |
b92503b2 | 41 | #include <net/ipv6.h> |
b7872fe8 | 42 | #include <net/tcp.h> |
c752f073 | 43 | #include <net/tcp_states.h> |
1da177e4 LT |
44 | #include <asm/uaccess.h> |
45 | #include <asm/ioctls.h> | |
22911fc5 | 46 | #include <trace/events/skb.h> |
1da177e4 LT |
47 | |
48 | #include <linux/sunrpc/types.h> | |
ad06e4bd | 49 | #include <linux/sunrpc/clnt.h> |
1da177e4 | 50 | #include <linux/sunrpc/xdr.h> |
c0401ea0 | 51 | #include <linux/sunrpc/msg_prot.h> |
1da177e4 LT |
52 | #include <linux/sunrpc/svcsock.h> |
53 | #include <linux/sunrpc/stats.h> | |
4cfc7e60 | 54 | #include <linux/sunrpc/xprt.h> |
1da177e4 | 55 | |
177e4f99 HS |
56 | #include "sunrpc.h" |
57 | ||
360d8738 | 58 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 LT |
59 | |
60 | ||
61 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
72c35376 | 62 | int flags); |
1da177e4 LT |
63 | static void svc_udp_data_ready(struct sock *, int); |
64 | static int svc_udp_recvfrom(struct svc_rqst *); | |
65 | static int svc_udp_sendto(struct svc_rqst *); | |
755cceab | 66 | static void svc_sock_detach(struct svc_xprt *); |
69b6ba37 | 67 | static void svc_tcp_sock_detach(struct svc_xprt *); |
755cceab | 68 | static void svc_sock_free(struct svc_xprt *); |
1da177e4 | 69 | |
b700cbb1 | 70 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
62832c03 PE |
71 | struct net *, struct sockaddr *, |
72 | int, int); | |
9e00abc3 | 73 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
74 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
75 | struct net *, struct sockaddr *, | |
76 | int, int); | |
77 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
9e00abc3 | 78 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 79 | |
ed07536e PZ |
80 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
81 | static struct lock_class_key svc_key[2]; | |
82 | static struct lock_class_key svc_slock_key[2]; | |
83 | ||
0f0257ea | 84 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
85 | { |
86 | struct sock *sk = sock->sk; | |
1b7a1819 WAA |
87 | |
88 | WARN_ON_ONCE(sock_owned_by_user(sk)); | |
89 | if (sock_owned_by_user(sk)) | |
90 | return; | |
91 | ||
ed07536e PZ |
92 | switch (sk->sk_family) { |
93 | case AF_INET: | |
94 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
95 | &svc_slock_key[0], |
96 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
97 | &svc_key[0]); | |
ed07536e PZ |
98 | break; |
99 | ||
100 | case AF_INET6: | |
101 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
102 | &svc_slock_key[1], |
103 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
104 | &svc_key[1]); | |
ed07536e PZ |
105 | break; |
106 | ||
107 | default: | |
108 | BUG(); | |
109 | } | |
110 | } | |
111 | #else | |
0f0257ea | 112 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
113 | { |
114 | } | |
115 | #endif | |
116 | ||
1da177e4 LT |
117 | /* |
118 | * Release an skbuff after use | |
119 | */ | |
5148bf4e | 120 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 121 | { |
5148bf4e | 122 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
123 | |
124 | if (skb) { | |
57b1d3ba TT |
125 | struct svc_sock *svsk = |
126 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 127 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
128 | |
129 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
9d410c79 | 130 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 | 131 | } |
1da177e4 LT |
132 | } |
133 | ||
b92503b2 CL |
134 | union svc_pktinfo_u { |
135 | struct in_pktinfo pkti; | |
b92503b2 | 136 | struct in6_pktinfo pkti6; |
b92503b2 | 137 | }; |
bc375ea7 DM |
138 | #define SVC_PKTINFO_SPACE \ |
139 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
140 | |
141 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
142 | { | |
57b1d3ba TT |
143 | struct svc_sock *svsk = |
144 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
145 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
146 | case AF_INET: { |
147 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
148 | ||
149 | cmh->cmsg_level = SOL_IP; | |
150 | cmh->cmsg_type = IP_PKTINFO; | |
151 | pki->ipi_ifindex = 0; | |
849a1cf1 MJ |
152 | pki->ipi_spec_dst.s_addr = |
153 | svc_daddr_in(rqstp)->sin_addr.s_addr; | |
b92503b2 CL |
154 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
155 | } | |
156 | break; | |
5a05ed73 | 157 | |
b92503b2 CL |
158 | case AF_INET6: { |
159 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 | 160 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
b92503b2 CL |
161 | |
162 | cmh->cmsg_level = SOL_IPV6; | |
163 | cmh->cmsg_type = IPV6_PKTINFO; | |
849a1cf1 | 164 | pki->ipi6_ifindex = daddr->sin6_scope_id; |
4e3fd7a0 | 165 | pki->ipi6_addr = daddr->sin6_addr; |
b92503b2 CL |
166 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
167 | } | |
168 | break; | |
b92503b2 | 169 | } |
b92503b2 CL |
170 | } |
171 | ||
1da177e4 | 172 | /* |
4cfc7e60 | 173 | * send routine intended to be shared by the fore- and back-channel |
1da177e4 | 174 | */ |
4cfc7e60 RI |
175 | int svc_send_common(struct socket *sock, struct xdr_buf *xdr, |
176 | struct page *headpage, unsigned long headoffset, | |
177 | struct page *tailpage, unsigned long tailoffset) | |
1da177e4 | 178 | { |
1da177e4 LT |
179 | int result; |
180 | int size; | |
181 | struct page **ppage = xdr->pages; | |
182 | size_t base = xdr->page_base; | |
183 | unsigned int pglen = xdr->page_len; | |
184 | unsigned int flags = MSG_MORE; | |
4cfc7e60 RI |
185 | int slen; |
186 | int len = 0; | |
1da177e4 LT |
187 | |
188 | slen = xdr->len; | |
189 | ||
1da177e4 LT |
190 | /* send head */ |
191 | if (slen == xdr->head[0].iov_len) | |
192 | flags = 0; | |
4cfc7e60 | 193 | len = kernel_sendpage(sock, headpage, headoffset, |
44524359 | 194 | xdr->head[0].iov_len, flags); |
1da177e4 LT |
195 | if (len != xdr->head[0].iov_len) |
196 | goto out; | |
197 | slen -= xdr->head[0].iov_len; | |
198 | if (slen == 0) | |
199 | goto out; | |
200 | ||
201 | /* send page data */ | |
202 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
203 | while (pglen > 0) { | |
204 | if (slen == size) | |
205 | flags = 0; | |
e6242e92 | 206 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
207 | if (result > 0) |
208 | len += result; | |
209 | if (result != size) | |
210 | goto out; | |
211 | slen -= size; | |
212 | pglen -= size; | |
213 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
214 | base = 0; | |
215 | ppage++; | |
216 | } | |
4cfc7e60 | 217 | |
1da177e4 LT |
218 | /* send tail */ |
219 | if (xdr->tail[0].iov_len) { | |
4cfc7e60 RI |
220 | result = kernel_sendpage(sock, tailpage, tailoffset, |
221 | xdr->tail[0].iov_len, 0); | |
1da177e4 LT |
222 | if (result > 0) |
223 | len += result; | |
224 | } | |
4cfc7e60 RI |
225 | |
226 | out: | |
227 | return len; | |
228 | } | |
229 | ||
230 | ||
231 | /* | |
232 | * Generic sendto routine | |
233 | */ | |
234 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
235 | { | |
236 | struct svc_sock *svsk = | |
237 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
238 | struct socket *sock = svsk->sk_sock; | |
239 | union { | |
240 | struct cmsghdr hdr; | |
241 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
242 | } buffer; | |
243 | struct cmsghdr *cmh = &buffer.hdr; | |
244 | int len = 0; | |
245 | unsigned long tailoff; | |
246 | unsigned long headoff; | |
247 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); | |
248 | ||
249 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
250 | struct msghdr msg = { | |
251 | .msg_name = &rqstp->rq_addr, | |
252 | .msg_namelen = rqstp->rq_addrlen, | |
253 | .msg_control = cmh, | |
254 | .msg_controllen = sizeof(buffer), | |
255 | .msg_flags = MSG_MORE, | |
256 | }; | |
257 | ||
258 | svc_set_cmsg_data(rqstp, cmh); | |
259 | ||
260 | if (sock_sendmsg(sock, &msg, 0) < 0) | |
261 | goto out; | |
262 | } | |
263 | ||
264 | tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); | |
265 | headoff = 0; | |
266 | len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, | |
267 | rqstp->rq_respages[0], tailoff); | |
268 | ||
1da177e4 | 269 | out: |
ad06e4bd | 270 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 271 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 272 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
273 | |
274 | return len; | |
275 | } | |
276 | ||
80212d59 N |
277 | /* |
278 | * Report socket names for nfsdfs | |
279 | */ | |
e7942b9f | 280 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
80212d59 | 281 | { |
017cb47f CL |
282 | const struct sock *sk = svsk->sk_sk; |
283 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? | |
284 | "udp" : "tcp"; | |
80212d59 N |
285 | int len; |
286 | ||
017cb47f | 287 | switch (sk->sk_family) { |
e7942b9f CL |
288 | case PF_INET: |
289 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", | |
017cb47f | 290 | proto_name, |
c720c7e8 ED |
291 | &inet_sk(sk)->inet_rcv_saddr, |
292 | inet_sk(sk)->inet_num); | |
80212d59 | 293 | break; |
58de2f86 CL |
294 | case PF_INET6: |
295 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", | |
017cb47f CL |
296 | proto_name, |
297 | &inet6_sk(sk)->rcv_saddr, | |
c720c7e8 | 298 | inet_sk(sk)->inet_num); |
80212d59 N |
299 | break; |
300 | default: | |
e7942b9f | 301 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
017cb47f | 302 | sk->sk_family); |
80212d59 | 303 | } |
e7942b9f CL |
304 | |
305 | if (len >= remaining) { | |
306 | *buf = '\0'; | |
307 | return -ENAMETOOLONG; | |
80212d59 N |
308 | } |
309 | return len; | |
310 | } | |
311 | ||
1da177e4 LT |
312 | /* |
313 | * Check input queue length | |
314 | */ | |
0f0257ea | 315 | static int svc_recv_available(struct svc_sock *svsk) |
1da177e4 | 316 | { |
1da177e4 LT |
317 | struct socket *sock = svsk->sk_sock; |
318 | int avail, err; | |
319 | ||
e6242e92 | 320 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); |
1da177e4 LT |
321 | |
322 | return (err >= 0)? avail : err; | |
323 | } | |
324 | ||
325 | /* | |
326 | * Generic recvfrom routine. | |
327 | */ | |
0f0257ea TT |
328 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
329 | int buflen) | |
1da177e4 | 330 | { |
57b1d3ba TT |
331 | struct svc_sock *svsk = |
332 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1ba95105 CL |
333 | struct msghdr msg = { |
334 | .msg_flags = MSG_DONTWAIT, | |
335 | }; | |
336 | int len; | |
1da177e4 | 337 | |
260c1d12 TT |
338 | rqstp->rq_xprt_hlen = 0; |
339 | ||
1ba95105 CL |
340 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
341 | msg.msg_flags); | |
1da177e4 | 342 | |
1da177e4 | 343 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
1ba95105 | 344 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
345 | return len; |
346 | } | |
347 | ||
31d68ef6 BF |
348 | static int svc_partial_recvfrom(struct svc_rqst *rqstp, |
349 | struct kvec *iov, int nr, | |
350 | int buflen, unsigned int base) | |
351 | { | |
352 | size_t save_iovlen; | |
09acfea5 | 353 | void *save_iovbase; |
31d68ef6 BF |
354 | unsigned int i; |
355 | int ret; | |
356 | ||
357 | if (base == 0) | |
358 | return svc_recvfrom(rqstp, iov, nr, buflen); | |
359 | ||
360 | for (i = 0; i < nr; i++) { | |
361 | if (iov[i].iov_len > base) | |
362 | break; | |
363 | base -= iov[i].iov_len; | |
364 | } | |
365 | save_iovlen = iov[i].iov_len; | |
366 | save_iovbase = iov[i].iov_base; | |
367 | iov[i].iov_len -= base; | |
368 | iov[i].iov_base += base; | |
369 | ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); | |
370 | iov[i].iov_len = save_iovlen; | |
371 | iov[i].iov_base = save_iovbase; | |
372 | return ret; | |
373 | } | |
374 | ||
1da177e4 LT |
375 | /* |
376 | * Set socket snd and rcv buffer lengths | |
377 | */ | |
0f0257ea TT |
378 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
379 | unsigned int rcv) | |
1da177e4 LT |
380 | { |
381 | #if 0 | |
382 | mm_segment_t oldfs; | |
383 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
384 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
385 | (char*)&snd, sizeof(snd)); | |
386 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
387 | (char*)&rcv, sizeof(rcv)); | |
388 | #else | |
389 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
390 | * which isn't acceptable. Until that is made conditional | |
391 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
392 | * DaveM said I could! | |
393 | */ | |
394 | lock_sock(sock->sk); | |
395 | sock->sk->sk_sndbuf = snd * 2; | |
396 | sock->sk->sk_rcvbuf = rcv * 2; | |
47fcb03f | 397 | sock->sk->sk_write_space(sock->sk); |
1da177e4 LT |
398 | release_sock(sock->sk); |
399 | #endif | |
400 | } | |
401 | /* | |
402 | * INET callback when data has been received on the socket. | |
403 | */ | |
0f0257ea | 404 | static void svc_udp_data_ready(struct sock *sk, int count) |
1da177e4 | 405 | { |
939bb7ef | 406 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 407 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 | 408 | |
939bb7ef NB |
409 | if (svsk) { |
410 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", | |
02fc6c36 TT |
411 | svsk, sk, count, |
412 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); | |
413 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
f6150c3c | 414 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 415 | } |
eaefd110 ED |
416 | if (wq && waitqueue_active(wq)) |
417 | wake_up_interruptible(wq); | |
1da177e4 LT |
418 | } |
419 | ||
420 | /* | |
421 | * INET callback when space is newly available on the socket. | |
422 | */ | |
0f0257ea | 423 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
424 | { |
425 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
eaefd110 | 426 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
427 | |
428 | if (svsk) { | |
429 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 430 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
f6150c3c | 431 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 LT |
432 | } |
433 | ||
eaefd110 | 434 | if (wq && waitqueue_active(wq)) { |
939bb7ef | 435 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 | 436 | svsk); |
eaefd110 | 437 | wake_up_interruptible(wq); |
1da177e4 LT |
438 | } |
439 | } | |
440 | ||
47fcb03f TM |
441 | static void svc_tcp_write_space(struct sock *sk) |
442 | { | |
443 | struct socket *sock = sk->sk_socket; | |
444 | ||
445 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock) | |
446 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
447 | svc_write_space(sk); | |
448 | } | |
449 | ||
7702ce40 CL |
450 | /* |
451 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
452 | */ | |
453 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
454 | struct cmsghdr *cmh) | |
455 | { | |
456 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
457 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
458 | ||
7702ce40 CL |
459 | if (cmh->cmsg_type != IP_PKTINFO) |
460 | return 0; | |
849a1cf1 MJ |
461 | |
462 | daddr->sin_family = AF_INET; | |
463 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; | |
7702ce40 CL |
464 | return 1; |
465 | } | |
466 | ||
467 | /* | |
468 | * See net/ipv6/datagram.c : datagram_recv_ctl | |
469 | */ | |
470 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
471 | struct cmsghdr *cmh) | |
472 | { | |
473 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
474 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
475 | ||
7702ce40 CL |
476 | if (cmh->cmsg_type != IPV6_PKTINFO) |
477 | return 0; | |
849a1cf1 MJ |
478 | |
479 | daddr->sin6_family = AF_INET6; | |
4e3fd7a0 | 480 | daddr->sin6_addr = pki->ipi6_addr; |
849a1cf1 | 481 | daddr->sin6_scope_id = pki->ipi6_ifindex; |
7702ce40 CL |
482 | return 1; |
483 | } | |
484 | ||
9dbc240f TT |
485 | /* |
486 | * Copy the UDP datagram's destination address to the rqstp structure. | |
487 | * The 'destination' address in this case is the address to which the | |
488 | * peer sent the datagram, i.e. our local address. For multihomed | |
489 | * hosts, this can change from msg to msg. Note that only the IP | |
490 | * address changes, the port number should remain the same. | |
491 | */ | |
7702ce40 CL |
492 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
493 | struct cmsghdr *cmh) | |
95756482 | 494 | { |
7702ce40 CL |
495 | switch (cmh->cmsg_level) { |
496 | case SOL_IP: | |
497 | return svc_udp_get_dest_address4(rqstp, cmh); | |
498 | case SOL_IPV6: | |
499 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 500 | } |
7702ce40 CL |
501 | |
502 | return 0; | |
95756482 CL |
503 | } |
504 | ||
1da177e4 LT |
505 | /* |
506 | * Receive a datagram from a UDP socket. | |
507 | */ | |
0f0257ea | 508 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 509 | { |
57b1d3ba TT |
510 | struct svc_sock *svsk = |
511 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 512 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 513 | struct sk_buff *skb; |
bc375ea7 DM |
514 | union { |
515 | struct cmsghdr hdr; | |
516 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
517 | } buffer; | |
518 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
519 | struct msghdr msg = { |
520 | .msg_name = svc_addr(rqstp), | |
521 | .msg_control = cmh, | |
522 | .msg_controllen = sizeof(buffer), | |
523 | .msg_flags = MSG_DONTWAIT, | |
524 | }; | |
abc5c44d CL |
525 | size_t len; |
526 | int err; | |
1da177e4 | 527 | |
02fc6c36 | 528 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
529 | /* udp sockets need large rcvbuf as all pending |
530 | * requests are still in that buffer. sndbuf must | |
531 | * also be large enough that there is enough space | |
3262c816 GB |
532 | * for one reply per thread. We count all threads |
533 | * rather than threads in a particular pool, which | |
534 | * provides an upper bound on the number of threads | |
535 | * which will access the socket. | |
1da177e4 LT |
536 | */ |
537 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
538 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
539 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 540 | |
02fc6c36 | 541 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
542 | skb = NULL; |
543 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
544 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
545 | if (err >= 0) | |
546 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
547 | ||
548 | if (skb == NULL) { | |
549 | if (err != -EAGAIN) { | |
550 | /* possibly an icmp error */ | |
551 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 552 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 553 | } |
9f9d2ebe | 554 | return 0; |
1da177e4 | 555 | } |
9dbc240f | 556 | len = svc_addr_len(svc_addr(rqstp)); |
9dbc240f | 557 | rqstp->rq_addrlen = len; |
b7aa0bf7 ED |
558 | if (skb->tstamp.tv64 == 0) { |
559 | skb->tstamp = ktime_get_real(); | |
cca5172a | 560 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
561 | need that much accuracy */ |
562 | } | |
b7aa0bf7 | 563 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 564 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 565 | |
1da177e4 LT |
566 | len = skb->len - sizeof(struct udphdr); |
567 | rqstp->rq_arg.len = len; | |
568 | ||
95756482 | 569 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 570 | |
7702ce40 | 571 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
e87cc472 JP |
572 | net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", |
573 | cmh->cmsg_level, cmh->cmsg_type); | |
f23abfdb | 574 | goto out_free; |
7a37f578 | 575 | } |
849a1cf1 | 576 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
1da177e4 LT |
577 | |
578 | if (skb_is_nonlinear(skb)) { | |
579 | /* we have to copy */ | |
580 | local_bh_disable(); | |
581 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
582 | local_bh_enable(); | |
583 | /* checksum error */ | |
22911fc5 | 584 | goto out_free; |
1da177e4 LT |
585 | } |
586 | local_bh_enable(); | |
9d410c79 | 587 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
588 | } else { |
589 | /* we can use it in-place */ | |
0f0257ea TT |
590 | rqstp->rq_arg.head[0].iov_base = skb->data + |
591 | sizeof(struct udphdr); | |
1da177e4 | 592 | rqstp->rq_arg.head[0].iov_len = len; |
22911fc5 ED |
593 | if (skb_checksum_complete(skb)) |
594 | goto out_free; | |
5148bf4e | 595 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
596 | } |
597 | ||
598 | rqstp->rq_arg.page_base = 0; | |
599 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
600 | rqstp->rq_arg.head[0].iov_len = len; | |
601 | rqstp->rq_arg.page_len = 0; | |
44524359 | 602 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
603 | } else { |
604 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 605 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 606 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 LT |
607 | } |
608 | ||
609 | if (serv->sv_stats) | |
610 | serv->sv_stats->netudpcnt++; | |
611 | ||
612 | return len; | |
f23abfdb BF |
613 | out_free: |
614 | trace_kfree_skb(skb, svc_udp_recvfrom); | |
615 | skb_free_datagram_locked(svsk->sk_sk, skb); | |
616 | return 0; | |
1da177e4 LT |
617 | } |
618 | ||
619 | static int | |
620 | svc_udp_sendto(struct svc_rqst *rqstp) | |
621 | { | |
622 | int error; | |
623 | ||
624 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
625 | if (error == -ECONNREFUSED) | |
626 | /* ICMP error on earlier request. */ | |
627 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
628 | ||
629 | return error; | |
630 | } | |
631 | ||
e831fe65 TT |
632 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
633 | { | |
634 | } | |
635 | ||
323bee32 TT |
636 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
637 | { | |
638 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 639 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
640 | unsigned long required; |
641 | ||
642 | /* | |
643 | * Set the SOCK_NOSPACE flag before checking the available | |
644 | * sock space. | |
645 | */ | |
646 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 647 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
648 | if (required*2 > sock_wspace(svsk->sk_sk)) |
649 | return 0; | |
650 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
651 | return 1; | |
652 | } | |
653 | ||
38a417cc TT |
654 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
655 | { | |
656 | BUG(); | |
657 | return NULL; | |
658 | } | |
659 | ||
b700cbb1 | 660 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
62832c03 | 661 | struct net *net, |
b700cbb1 TT |
662 | struct sockaddr *sa, int salen, |
663 | int flags) | |
664 | { | |
62832c03 | 665 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
b700cbb1 TT |
666 | } |
667 | ||
360d8738 | 668 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 669 | .xpo_create = svc_udp_create, |
5d137990 TT |
670 | .xpo_recvfrom = svc_udp_recvfrom, |
671 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 672 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
673 | .xpo_detach = svc_sock_detach, |
674 | .xpo_free = svc_sock_free, | |
e831fe65 | 675 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 676 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 677 | .xpo_accept = svc_udp_accept, |
360d8738 TT |
678 | }; |
679 | ||
680 | static struct svc_xprt_class svc_udp_class = { | |
681 | .xcl_name = "udp", | |
b700cbb1 | 682 | .xcl_owner = THIS_MODULE, |
360d8738 | 683 | .xcl_ops = &svc_udp_ops, |
49023155 | 684 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
360d8738 TT |
685 | }; |
686 | ||
bb5cf160 | 687 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 688 | { |
7702ce40 | 689 | int err, level, optname, one = 1; |
7a37f578 | 690 | |
bd4620dd SK |
691 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
692 | &svsk->sk_xprt, serv); | |
def13d74 | 693 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
694 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
695 | svsk->sk_sk->sk_write_space = svc_write_space; | |
1da177e4 LT |
696 | |
697 | /* initialise setting must have enough space to | |
cca5172a | 698 | * receive and respond to one request. |
1da177e4 LT |
699 | * svc_udp_recvfrom will re-adjust if necessary |
700 | */ | |
701 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
702 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
703 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 704 | |
0f0257ea TT |
705 | /* data might have come in before data_ready set up */ |
706 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 707 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 708 | |
7a37f578 | 709 | /* make sure we get destination address info */ |
7702ce40 CL |
710 | switch (svsk->sk_sk->sk_family) { |
711 | case AF_INET: | |
712 | level = SOL_IP; | |
713 | optname = IP_PKTINFO; | |
714 | break; | |
715 | case AF_INET6: | |
716 | level = SOL_IPV6; | |
717 | optname = IPV6_RECVPKTINFO; | |
718 | break; | |
719 | default: | |
720 | BUG(); | |
721 | } | |
722 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
723 | (char *)&one, sizeof(one)); | |
724 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
1da177e4 LT |
725 | } |
726 | ||
727 | /* | |
728 | * A data_ready event on a listening socket means there's a connection | |
729 | * pending. Do not use state_change as a substitute for it. | |
730 | */ | |
0f0257ea | 731 | static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) |
1da177e4 | 732 | { |
939bb7ef | 733 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 734 | wait_queue_head_t *wq; |
1da177e4 LT |
735 | |
736 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 737 | sk, sk->sk_state); |
1da177e4 | 738 | |
939bb7ef NB |
739 | /* |
740 | * This callback may called twice when a new connection | |
741 | * is established as a child socket inherits everything | |
742 | * from a parent LISTEN socket. | |
743 | * 1) data_ready method of the parent socket will be called | |
744 | * when one of child sockets become ESTABLISHED. | |
745 | * 2) data_ready method of the child socket may be called | |
746 | * when it receives data before the socket is accepted. | |
747 | * In case of 2, we should ignore it silently. | |
748 | */ | |
749 | if (sk->sk_state == TCP_LISTEN) { | |
750 | if (svsk) { | |
02fc6c36 | 751 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 752 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
753 | } else |
754 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 755 | } |
939bb7ef | 756 | |
eaefd110 ED |
757 | wq = sk_sleep(sk); |
758 | if (wq && waitqueue_active(wq)) | |
759 | wake_up_interruptible_all(wq); | |
1da177e4 LT |
760 | } |
761 | ||
762 | /* | |
763 | * A state change on a connected socket means it's dying or dead. | |
764 | */ | |
0f0257ea | 765 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 766 | { |
939bb7ef | 767 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 768 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
769 | |
770 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 771 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 772 | |
939bb7ef | 773 | if (!svsk) |
1da177e4 | 774 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 775 | else { |
02fc6c36 | 776 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 777 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 778 | } |
eaefd110 ED |
779 | if (wq && waitqueue_active(wq)) |
780 | wake_up_interruptible_all(wq); | |
1da177e4 LT |
781 | } |
782 | ||
0f0257ea | 783 | static void svc_tcp_data_ready(struct sock *sk, int count) |
1da177e4 | 784 | { |
939bb7ef | 785 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 786 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
787 | |
788 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
789 | sk, sk->sk_user_data); |
790 | if (svsk) { | |
02fc6c36 | 791 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 792 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 793 | } |
eaefd110 ED |
794 | if (wq && waitqueue_active(wq)) |
795 | wake_up_interruptible(wq); | |
1da177e4 LT |
796 | } |
797 | ||
798 | /* | |
799 | * Accept a TCP connection | |
800 | */ | |
38a417cc | 801 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 802 | { |
38a417cc | 803 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f | 804 | struct sockaddr_storage addr; |
805 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 806 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
807 | struct socket *sock = svsk->sk_sock; |
808 | struct socket *newsock; | |
1da177e4 LT |
809 | struct svc_sock *newsvsk; |
810 | int err, slen; | |
5216a8e7 | 811 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
812 | |
813 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
814 | if (!sock) | |
38a417cc | 815 | return NULL; |
1da177e4 | 816 | |
02fc6c36 | 817 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
818 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
819 | if (err < 0) { | |
1da177e4 LT |
820 | if (err == -ENOMEM) |
821 | printk(KERN_WARNING "%s: no more sockets!\n", | |
822 | serv->sv_name); | |
e87cc472 JP |
823 | else if (err != -EAGAIN) |
824 | net_warn_ratelimited("%s: accept failed (err %d)!\n", | |
825 | serv->sv_name, -err); | |
38a417cc | 826 | return NULL; |
1da177e4 | 827 | } |
02fc6c36 | 828 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 829 | |
cdd88b9f | 830 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 | 831 | if (err < 0) { |
e87cc472 JP |
832 | net_warn_ratelimited("%s: peername failed (err %d)!\n", |
833 | serv->sv_name, -err); | |
1da177e4 LT |
834 | goto failed; /* aborted connection or whatever */ |
835 | } | |
836 | ||
837 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
838 | * hosts here, but when we get encryption, the IP of the host won't |
839 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 840 | */ |
cdd88b9f | 841 | if (!svc_port_is_privileged(sin)) { |
1da177e4 | 842 | dprintk(KERN_WARNING |
ad06e4bd | 843 | "%s: connect from unprivileged port: %s\n", |
cca5172a | 844 | serv->sv_name, |
cdd88b9f | 845 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 846 | } |
ad06e4bd | 847 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 848 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
849 | |
850 | /* make sure that a write doesn't block forever when | |
851 | * low on memory | |
852 | */ | |
853 | newsock->sk->sk_sndtimeo = HZ*30; | |
854 | ||
72c35376 BF |
855 | newsvsk = svc_setup_socket(serv, newsock, |
856 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); | |
857 | if (IS_ERR(newsvsk)) | |
1da177e4 | 858 | goto failed; |
9dbc240f | 859 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
860 | 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 | } | |
9dbc240f | 865 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 866 | |
f9f3cc4f TT |
867 | if (serv->sv_stats) |
868 | serv->sv_stats->nettcpconn++; | |
869 | ||
870 | return &newsvsk->sk_xprt; | |
871 | ||
872 | failed: | |
873 | sock_release(newsock); | |
874 | return NULL; | |
875 | } | |
876 | ||
31d68ef6 BF |
877 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
878 | { | |
879 | unsigned int i, len, npages; | |
880 | ||
881 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
882 | return 0; | |
883 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
884 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
885 | for (i = 0; i < npages; i++) { | |
886 | if (rqstp->rq_pages[i] != NULL) | |
887 | put_page(rqstp->rq_pages[i]); | |
888 | BUG_ON(svsk->sk_pages[i] == NULL); | |
889 | rqstp->rq_pages[i] = svsk->sk_pages[i]; | |
890 | svsk->sk_pages[i] = NULL; | |
891 | } | |
892 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
893 | return len; | |
894 | } | |
895 | ||
896 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
897 | { | |
898 | unsigned int i, len, npages; | |
899 | ||
900 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
901 | return; | |
902 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
903 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
904 | for (i = 0; i < npages; i++) { | |
905 | svsk->sk_pages[i] = rqstp->rq_pages[i]; | |
906 | rqstp->rq_pages[i] = NULL; | |
907 | } | |
908 | } | |
909 | ||
910 | static void svc_tcp_clear_pages(struct svc_sock *svsk) | |
911 | { | |
912 | unsigned int i, len, npages; | |
913 | ||
914 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
915 | goto out; | |
916 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
917 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
918 | for (i = 0; i < npages; i++) { | |
919 | BUG_ON(svsk->sk_pages[i] == NULL); | |
920 | put_page(svsk->sk_pages[i]); | |
921 | svsk->sk_pages[i] = NULL; | |
922 | } | |
923 | out: | |
924 | svsk->sk_tcplen = 0; | |
925 | } | |
926 | ||
1da177e4 | 927 | /* |
8f55f3c0 AB |
928 | * Receive data. |
929 | * If we haven't gotten the record length yet, get the next four bytes. | |
930 | * Otherwise try to gobble up as much as possible up to the complete | |
931 | * record length. | |
1da177e4 | 932 | */ |
8f55f3c0 | 933 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
1da177e4 | 934 | { |
bb5cf160 | 935 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
5ee78d48 | 936 | unsigned int want; |
8f55f3c0 | 937 | int len; |
1da177e4 | 938 | |
02fc6c36 | 939 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 940 | |
c0401ea0 | 941 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
1da177e4 LT |
942 | struct kvec iov; |
943 | ||
5ee78d48 | 944 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
1da177e4 LT |
945 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
946 | iov.iov_len = want; | |
947 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
948 | goto error; | |
949 | svsk->sk_tcplen += len; | |
950 | ||
951 | if (len < want) { | |
c0401ea0 CL |
952 | dprintk("svc: short recvfrom while reading record " |
953 | "length (%d of %d)\n", len, want); | |
31d68ef6 | 954 | return -EAGAIN; |
1da177e4 LT |
955 | } |
956 | ||
957 | svsk->sk_reclen = ntohl(svsk->sk_reclen); | |
c0401ea0 | 958 | if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) { |
1da177e4 LT |
959 | /* FIXME: technically, a record can be fragmented, |
960 | * and non-terminal fragments will not have the top | |
961 | * bit set in the fragment length header. | |
962 | * But apparently no known nfs clients send fragmented | |
963 | * records. */ | |
e87cc472 | 964 | net_notice_ratelimited("RPC: multiple fragments per record not supported\n"); |
1da177e4 LT |
965 | goto err_delete; |
966 | } | |
8f55f3c0 | 967 | |
c0401ea0 | 968 | svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK; |
1da177e4 | 969 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); |
c6b0a9f8 | 970 | if (svsk->sk_reclen > serv->sv_max_mesg) { |
e87cc472 JP |
971 | net_notice_ratelimited("RPC: fragment too large: 0x%08lx\n", |
972 | (unsigned long)svsk->sk_reclen); | |
1da177e4 LT |
973 | goto err_delete; |
974 | } | |
975 | } | |
976 | ||
cc6c2127 BF |
977 | if (svsk->sk_reclen < 8) |
978 | goto err_delete; /* client is nuts. */ | |
979 | ||
1da177e4 | 980 | len = svsk->sk_reclen; |
1da177e4 | 981 | |
8f55f3c0 | 982 | return len; |
31d68ef6 BF |
983 | error: |
984 | dprintk("RPC: TCP recv_record got %d\n", len); | |
8f55f3c0 | 985 | return len; |
31d68ef6 | 986 | err_delete: |
8f55f3c0 | 987 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
8f55f3c0 AB |
988 | return -EAGAIN; |
989 | } | |
990 | ||
586c52cc | 991 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
4cfc7e60 | 992 | { |
586c52cc | 993 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
4cfc7e60 | 994 | struct rpc_rqst *req = NULL; |
586c52cc TM |
995 | struct kvec *src, *dst; |
996 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
48e6555c BF |
997 | __be32 xid; |
998 | __be32 calldir; | |
4cfc7e60 | 999 | |
4cfc7e60 RI |
1000 | xid = *p++; |
1001 | calldir = *p; | |
1002 | ||
586c52cc TM |
1003 | if (bc_xprt) |
1004 | req = xprt_lookup_rqst(bc_xprt, xid); | |
4cfc7e60 | 1005 | |
586c52cc TM |
1006 | if (!req) { |
1007 | printk(KERN_NOTICE | |
1008 | "%s: Got unrecognized reply: " | |
1009 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
1010 | __func__, ntohl(calldir), | |
1011 | bc_xprt, xid); | |
1012 | return -EAGAIN; | |
4cfc7e60 | 1013 | } |
586c52cc TM |
1014 | |
1015 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
1016 | /* | |
1017 | * XXX!: cheating for now! Only copying HEAD. | |
1018 | * But we know this is good enough for now (in fact, for any | |
1019 | * callback reply in the forseeable future). | |
1020 | */ | |
1021 | dst = &req->rq_private_buf.head[0]; | |
1022 | src = &rqstp->rq_arg.head[0]; | |
1023 | if (dst->iov_len < src->iov_len) | |
1024 | return -EAGAIN; /* whatever; just giving up. */ | |
1025 | memcpy(dst->iov_base, src->iov_base, src->iov_len); | |
1026 | xprt_complete_rqst(req->rq_task, svsk->sk_reclen); | |
1027 | rqstp->rq_arg.len = 0; | |
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) | |
1032 | { | |
1033 | int i = 0; | |
1034 | int t = 0; | |
1035 | ||
1036 | while (t < len) { | |
1037 | vec[i].iov_base = page_address(pages[i]); | |
1038 | vec[i].iov_len = PAGE_SIZE; | |
1039 | i++; | |
1040 | t += PAGE_SIZE; | |
1041 | } | |
1042 | return i; | |
4cfc7e60 RI |
1043 | } |
1044 | ||
31d68ef6 | 1045 | |
8f55f3c0 AB |
1046 | /* |
1047 | * Receive data from a TCP socket. | |
1048 | */ | |
1049 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1050 | { | |
1051 | struct svc_sock *svsk = | |
1052 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1053 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1054 | int len; | |
1055 | struct kvec *vec; | |
31d68ef6 | 1056 | unsigned int want, base; |
586c52cc TM |
1057 | __be32 *p; |
1058 | __be32 calldir; | |
5ee78d48 | 1059 | int pnum; |
8f55f3c0 AB |
1060 | |
1061 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1062 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1063 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1064 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1065 | ||
1066 | len = svc_tcp_recv_record(svsk, rqstp); | |
1067 | if (len < 0) | |
1068 | goto error; | |
1069 | ||
31d68ef6 BF |
1070 | base = svc_tcp_restore_pages(svsk, rqstp); |
1071 | want = svsk->sk_reclen - base; | |
1072 | ||
3cc03b16 | 1073 | vec = rqstp->rq_vec; |
4cfc7e60 | 1074 | |
586c52cc TM |
1075 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], |
1076 | svsk->sk_reclen); | |
1077 | ||
44524359 | 1078 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
1da177e4 LT |
1079 | |
1080 | /* Now receive data */ | |
31d68ef6 BF |
1081 | len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); |
1082 | if (len >= 0) | |
1083 | svsk->sk_tcplen += len; | |
1084 | if (len != want) { | |
be1e4444 | 1085 | svc_tcp_save_pages(svsk, rqstp); |
31d68ef6 BF |
1086 | if (len < 0 && len != -EAGAIN) |
1087 | goto err_other; | |
31d68ef6 BF |
1088 | dprintk("svc: incomplete TCP record (%d of %d)\n", |
1089 | svsk->sk_tcplen, svsk->sk_reclen); | |
1090 | goto err_noclose; | |
1091 | } | |
1da177e4 | 1092 | |
5ee78d48 | 1093 | rqstp->rq_arg.len = svsk->sk_reclen; |
1da177e4 | 1094 | rqstp->rq_arg.page_base = 0; |
5ee78d48 TM |
1095 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1096 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1da177e4 | 1097 | rqstp->rq_arg.page_len = 0; |
5ee78d48 TM |
1098 | } else |
1099 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1da177e4 | 1100 | |
5148bf4e | 1101 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
1102 | rqstp->rq_prot = IPPROTO_TCP; |
1103 | ||
586c52cc TM |
1104 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
1105 | calldir = p[1]; | |
8985ef0b | 1106 | if (calldir) |
586c52cc | 1107 | len = receive_cb_reply(svsk, rqstp); |
586c52cc | 1108 | |
1da177e4 LT |
1109 | /* Reset TCP read info */ |
1110 | svsk->sk_reclen = 0; | |
1111 | svsk->sk_tcplen = 0; | |
0601f793 TM |
1112 | /* If we have more data, signal svc_xprt_enqueue() to try again */ |
1113 | if (svc_recv_available(svsk) > sizeof(rpc_fraghdr)) | |
1114 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
1115 | ||
8985ef0b BF |
1116 | if (len < 0) |
1117 | goto error; | |
1da177e4 | 1118 | |
9dbc240f | 1119 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1120 | if (serv->sv_stats) |
1121 | serv->sv_stats->nettcpcnt++; | |
1122 | ||
31d68ef6 | 1123 | dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len); |
5ee78d48 | 1124 | return rqstp->rq_arg.len; |
1da177e4 | 1125 | |
8f55f3c0 | 1126 | error: |
31d68ef6 BF |
1127 | if (len != -EAGAIN) |
1128 | goto err_other; | |
1129 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); | |
9f9d2ebe | 1130 | return 0; |
31d68ef6 BF |
1131 | err_other: |
1132 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", | |
1133 | svsk->sk_xprt.xpt_server->sv_name, -len); | |
1134 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1135 | err_noclose: | |
9f9d2ebe | 1136 | return 0; /* record not complete */ |
1da177e4 LT |
1137 | } |
1138 | ||
1139 | /* | |
1140 | * Send out data on TCP socket. | |
1141 | */ | |
0f0257ea | 1142 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
1143 | { |
1144 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1145 | int sent; | |
d8ed029d | 1146 | __be32 reclen; |
1da177e4 LT |
1147 | |
1148 | /* Set up the first element of the reply kvec. | |
1149 | * Any other kvecs that may be in use have been taken | |
1150 | * care of by the server implementation itself. | |
1151 | */ | |
1152 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1153 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1154 | ||
1da177e4 LT |
1155 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
1156 | if (sent != xbufp->len) { | |
0f0257ea TT |
1157 | printk(KERN_NOTICE |
1158 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1159 | "- shutting down socket\n", | |
57b1d3ba | 1160 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1161 | (sent<0)?"got error":"sent only", |
1162 | sent, xbufp->len); | |
57b1d3ba | 1163 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1164 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1165 | sent = -EAGAIN; |
1166 | } | |
1167 | return sent; | |
1168 | } | |
1169 | ||
e831fe65 TT |
1170 | /* |
1171 | * Setup response header. TCP has a 4B record length field. | |
1172 | */ | |
1173 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1174 | { | |
1175 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1176 | ||
1177 | /* tcp needs a space for the record length... */ | |
1178 | svc_putnl(resv, 0); | |
1179 | } | |
1180 | ||
323bee32 TT |
1181 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
1182 | { | |
57b1d3ba | 1183 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
47fcb03f | 1184 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
323bee32 | 1185 | int required; |
323bee32 | 1186 | |
47fcb03f TM |
1187 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) |
1188 | return 1; | |
1189 | required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; | |
1190 | if (sk_stream_wspace(svsk->sk_sk) >= required) | |
1191 | return 1; | |
323bee32 | 1192 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
47fcb03f | 1193 | return 0; |
323bee32 TT |
1194 | } |
1195 | ||
b700cbb1 | 1196 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
62832c03 | 1197 | struct net *net, |
b700cbb1 TT |
1198 | struct sockaddr *sa, int salen, |
1199 | int flags) | |
1200 | { | |
62832c03 | 1201 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
b700cbb1 TT |
1202 | } |
1203 | ||
9e00abc3 | 1204 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
1205 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
1206 | struct net *, struct sockaddr *, | |
1207 | int, int); | |
1208 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
1209 | ||
1210 | static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, | |
1211 | struct net *net, | |
1212 | struct sockaddr *sa, int salen, | |
1213 | int flags) | |
1214 | { | |
1215 | return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); | |
1216 | } | |
1217 | ||
1218 | static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) | |
1219 | { | |
1220 | } | |
1221 | ||
1222 | static struct svc_xprt_ops svc_tcp_bc_ops = { | |
1223 | .xpo_create = svc_bc_tcp_create, | |
1224 | .xpo_detach = svc_bc_tcp_sock_detach, | |
1225 | .xpo_free = svc_bc_sock_free, | |
1226 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, | |
1227 | }; | |
1228 | ||
1229 | static struct svc_xprt_class svc_tcp_bc_class = { | |
1230 | .xcl_name = "tcp-bc", | |
1231 | .xcl_owner = THIS_MODULE, | |
1232 | .xcl_ops = &svc_tcp_bc_ops, | |
1233 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
1234 | }; | |
16b2d1e1 AA |
1235 | |
1236 | static void svc_init_bc_xprt_sock(void) | |
1237 | { | |
1238 | svc_reg_xprt_class(&svc_tcp_bc_class); | |
1239 | } | |
1240 | ||
1241 | static void svc_cleanup_bc_xprt_sock(void) | |
1242 | { | |
1243 | svc_unreg_xprt_class(&svc_tcp_bc_class); | |
1244 | } | |
9e00abc3 | 1245 | #else /* CONFIG_SUNRPC_BACKCHANNEL */ |
16b2d1e1 AA |
1246 | static void svc_init_bc_xprt_sock(void) |
1247 | { | |
1248 | } | |
1249 | ||
1250 | static void svc_cleanup_bc_xprt_sock(void) | |
1251 | { | |
1252 | } | |
9e00abc3 | 1253 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 1254 | |
360d8738 | 1255 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1256 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1257 | .xpo_recvfrom = svc_tcp_recvfrom, |
1258 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1259 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1260 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1261 | .xpo_free = svc_sock_free, |
e831fe65 | 1262 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1263 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1264 | .xpo_accept = svc_tcp_accept, |
360d8738 TT |
1265 | }; |
1266 | ||
1267 | static struct svc_xprt_class svc_tcp_class = { | |
1268 | .xcl_name = "tcp", | |
b700cbb1 | 1269 | .xcl_owner = THIS_MODULE, |
360d8738 | 1270 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1271 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
360d8738 TT |
1272 | }; |
1273 | ||
1274 | void svc_init_xprt_sock(void) | |
1275 | { | |
1276 | svc_reg_xprt_class(&svc_tcp_class); | |
1277 | svc_reg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1278 | svc_init_bc_xprt_sock(); |
360d8738 TT |
1279 | } |
1280 | ||
1281 | void svc_cleanup_xprt_sock(void) | |
1282 | { | |
1283 | svc_unreg_xprt_class(&svc_tcp_class); | |
1284 | svc_unreg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1285 | svc_cleanup_bc_xprt_sock(); |
360d8738 TT |
1286 | } |
1287 | ||
bb5cf160 | 1288 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1289 | { |
1290 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1291 | |
bd4620dd SK |
1292 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
1293 | &svsk->sk_xprt, serv); | |
def13d74 | 1294 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1295 | if (sk->sk_state == TCP_LISTEN) { |
1296 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1297 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1298 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1299 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1300 | } else { |
1301 | dprintk("setting up TCP socket for reading\n"); | |
1302 | sk->sk_state_change = svc_tcp_state_change; | |
1303 | sk->sk_data_ready = svc_tcp_data_ready; | |
47fcb03f | 1304 | sk->sk_write_space = svc_tcp_write_space; |
1da177e4 LT |
1305 | |
1306 | svsk->sk_reclen = 0; | |
1307 | svsk->sk_tcplen = 0; | |
31d68ef6 | 1308 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
1da177e4 | 1309 | |
b7872fe8 | 1310 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1311 | |
02fc6c36 | 1312 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
cca5172a | 1313 | if (sk->sk_state != TCP_ESTABLISHED) |
02fc6c36 | 1314 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1315 | } |
1316 | } | |
1317 | ||
0f0257ea | 1318 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1319 | { |
1320 | /* | |
1321 | * The number of server threads has changed. Update | |
1322 | * rcvbuf and sndbuf accordingly on all sockets | |
1323 | */ | |
8f3a6de3 | 1324 | struct svc_sock *svsk; |
1da177e4 LT |
1325 | |
1326 | spin_lock_bh(&serv->sv_lock); | |
8f3a6de3 | 1327 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
02fc6c36 | 1328 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1329 | spin_unlock_bh(&serv->sv_lock); |
1330 | } | |
24c3767e | 1331 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1332 | |
1da177e4 LT |
1333 | /* |
1334 | * Initialize socket for RPC use and create svc_sock struct | |
1335 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1336 | */ | |
6b174337 CL |
1337 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1338 | struct socket *sock, | |
72c35376 | 1339 | int flags) |
1da177e4 LT |
1340 | { |
1341 | struct svc_sock *svsk; | |
1342 | struct sock *inet; | |
6b174337 | 1343 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
72c35376 | 1344 | int err = 0; |
1da177e4 LT |
1345 | |
1346 | dprintk("svc: svc_setup_socket %p\n", sock); | |
72c35376 BF |
1347 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1348 | if (!svsk) | |
1349 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
1350 | |
1351 | inet = sock->sk; | |
1352 | ||
1353 | /* Register socket with portmapper */ | |
72c35376 BF |
1354 | if (pmap_register) |
1355 | err = svc_register(serv, sock_net(sock->sk), inet->sk_family, | |
5247fab5 | 1356 | inet->sk_protocol, |
c720c7e8 | 1357 | ntohs(inet_sk(inet)->inet_sport)); |
1da177e4 | 1358 | |
72c35376 | 1359 | if (err < 0) { |
1da177e4 | 1360 | kfree(svsk); |
72c35376 | 1361 | return ERR_PTR(err); |
1da177e4 LT |
1362 | } |
1363 | ||
1da177e4 LT |
1364 | inet->sk_user_data = svsk; |
1365 | svsk->sk_sock = sock; | |
1366 | svsk->sk_sk = inet; | |
1367 | svsk->sk_ostate = inet->sk_state_change; | |
1368 | svsk->sk_odata = inet->sk_data_ready; | |
1369 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1370 | |
1371 | /* Initialize the socket */ | |
1372 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1373 | svc_udp_init(svsk, serv); |
96604398 OK |
1374 | else { |
1375 | /* initialise setting must have enough space to | |
1376 | * receive and respond to one request. | |
1377 | */ | |
1378 | svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, | |
1379 | 4 * serv->sv_max_mesg); | |
bb5cf160 | 1380 | svc_tcp_init(svsk, serv); |
96604398 | 1381 | } |
1da177e4 | 1382 | |
1da177e4 LT |
1383 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
1384 | svsk, svsk->sk_sk); | |
1385 | ||
1da177e4 LT |
1386 | return svsk; |
1387 | } | |
1388 | ||
bfba9ab4 CL |
1389 | /** |
1390 | * svc_addsock - add a listener socket to an RPC service | |
1391 | * @serv: pointer to RPC service to which to add a new listener | |
1392 | * @fd: file descriptor of the new listener | |
1393 | * @name_return: pointer to buffer to fill in with name of listener | |
1394 | * @len: size of the buffer | |
1395 | * | |
1396 | * Fills in socket name and returns positive length of name if successful. | |
1397 | * Name is terminated with '\n'. On error, returns a negative errno | |
1398 | * value. | |
1399 | */ | |
1400 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
1401 | const size_t len) | |
b41b66d6 N |
1402 | { |
1403 | int err = 0; | |
1404 | struct socket *so = sockfd_lookup(fd, &err); | |
1405 | struct svc_sock *svsk = NULL; | |
a8e10078 BF |
1406 | struct sockaddr_storage addr; |
1407 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1408 | int salen; | |
b41b66d6 N |
1409 | |
1410 | if (!so) | |
1411 | return err; | |
a8e10078 | 1412 | err = -EAFNOSUPPORT; |
205ba423 | 1413 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
a8e10078 BF |
1414 | goto out; |
1415 | err = -EPROTONOSUPPORT; | |
1416 | if (so->sk->sk_protocol != IPPROTO_TCP && | |
b41b66d6 | 1417 | so->sk->sk_protocol != IPPROTO_UDP) |
a8e10078 BF |
1418 | goto out; |
1419 | err = -EISCONN; | |
1420 | if (so->state > SS_UNCONNECTED) | |
1421 | goto out; | |
1422 | err = -ENOENT; | |
1423 | if (!try_module_get(THIS_MODULE)) | |
1424 | goto out; | |
1425 | svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); | |
1426 | if (IS_ERR(svsk)) { | |
1427 | module_put(THIS_MODULE); | |
1428 | err = PTR_ERR(svsk); | |
1429 | goto out; | |
b41b66d6 | 1430 | } |
a8e10078 BF |
1431 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) |
1432 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
39b55301 | 1433 | svc_add_new_perm_xprt(serv, &svsk->sk_xprt); |
e7942b9f | 1434 | return svc_one_sock_name(svsk, name_return, len); |
a8e10078 BF |
1435 | out: |
1436 | sockfd_put(so); | |
1437 | return err; | |
b41b66d6 N |
1438 | } |
1439 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1440 | ||
1da177e4 LT |
1441 | /* |
1442 | * Create socket for RPC service. | |
1443 | */ | |
b700cbb1 TT |
1444 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1445 | int protocol, | |
62832c03 | 1446 | struct net *net, |
b700cbb1 TT |
1447 | struct sockaddr *sin, int len, |
1448 | int flags) | |
1da177e4 LT |
1449 | { |
1450 | struct svc_sock *svsk; | |
1451 | struct socket *sock; | |
1452 | int error; | |
1453 | int type; | |
9dbc240f TT |
1454 | struct sockaddr_storage addr; |
1455 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1456 | int newlen; | |
c69da774 TM |
1457 | int family; |
1458 | int val; | |
5216a8e7 | 1459 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 1460 | |
ad06e4bd CL |
1461 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1462 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1463 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1464 | |
1465 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1466 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1467 | "sockets supported\n"); | |
b700cbb1 | 1468 | return ERR_PTR(-EINVAL); |
1da177e4 | 1469 | } |
c69da774 | 1470 | |
1da177e4 | 1471 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
c69da774 TM |
1472 | switch (sin->sa_family) { |
1473 | case AF_INET6: | |
1474 | family = PF_INET6; | |
1475 | break; | |
1476 | case AF_INET: | |
1477 | family = PF_INET; | |
1478 | break; | |
1479 | default: | |
1480 | return ERR_PTR(-EINVAL); | |
1481 | } | |
1da177e4 | 1482 | |
14ec63c3 | 1483 | error = __sock_create(net, family, type, protocol, &sock, 1); |
77f1f67a | 1484 | if (error < 0) |
b700cbb1 | 1485 | return ERR_PTR(error); |
1da177e4 | 1486 | |
ed07536e PZ |
1487 | svc_reclassify_socket(sock); |
1488 | ||
c69da774 TM |
1489 | /* |
1490 | * If this is an PF_INET6 listener, we want to avoid | |
1491 | * getting requests from IPv4 remotes. Those should | |
1492 | * be shunted to a PF_INET listener via rpcbind. | |
1493 | */ | |
1494 | val = 1; | |
1495 | if (family == PF_INET6) | |
1496 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, | |
1497 | (char *)&val, sizeof(val)); | |
1498 | ||
18114746 | 1499 | if (type == SOCK_STREAM) |
4a17fd52 | 1500 | sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ |
77f1f67a | 1501 | error = kernel_bind(sock, sin, len); |
18114746 ES |
1502 | if (error < 0) |
1503 | goto bummer; | |
1da177e4 | 1504 | |
9dbc240f TT |
1505 | newlen = len; |
1506 | error = kernel_getsockname(sock, newsin, &newlen); | |
1507 | if (error < 0) | |
1508 | goto bummer; | |
1509 | ||
1da177e4 | 1510 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1511 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1512 | goto bummer; |
1513 | } | |
1514 | ||
72c35376 | 1515 | svsk = svc_setup_socket(serv, sock, flags); |
a8e10078 BF |
1516 | if (IS_ERR(svsk)) { |
1517 | error = PTR_ERR(svsk); | |
1518 | goto bummer; | |
e79eff1f | 1519 | } |
a8e10078 BF |
1520 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
1521 | return (struct svc_xprt *)svsk; | |
1da177e4 LT |
1522 | bummer: |
1523 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1524 | sock_release(sock); | |
b700cbb1 | 1525 | return ERR_PTR(error); |
1da177e4 LT |
1526 | } |
1527 | ||
755cceab TT |
1528 | /* |
1529 | * Detach the svc_sock from the socket so that no | |
1530 | * more callbacks occur. | |
1531 | */ | |
1532 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1533 | { | |
1534 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1535 | struct sock *sk = svsk->sk_sk; | |
eaefd110 | 1536 | wait_queue_head_t *wq; |
755cceab TT |
1537 | |
1538 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1539 | ||
1540 | /* put back the old socket callbacks */ | |
1541 | sk->sk_state_change = svsk->sk_ostate; | |
1542 | sk->sk_data_ready = svsk->sk_odata; | |
1543 | sk->sk_write_space = svsk->sk_owspace; | |
69b6ba37 | 1544 | |
eaefd110 ED |
1545 | wq = sk_sleep(sk); |
1546 | if (wq && waitqueue_active(wq)) | |
1547 | wake_up_interruptible(wq); | |
69b6ba37 TM |
1548 | } |
1549 | ||
1550 | /* | |
1551 | * Disconnect the socket, and reset the callbacks | |
1552 | */ | |
1553 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1554 | { | |
1555 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1556 | ||
1557 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1558 | ||
1559 | svc_sock_detach(xprt); | |
1560 | ||
31d68ef6 BF |
1561 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
1562 | svc_tcp_clear_pages(svsk); | |
69b6ba37 | 1563 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
31d68ef6 | 1564 | } |
755cceab TT |
1565 | } |
1566 | ||
1567 | /* | |
1568 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1569 | */ | |
1570 | static void svc_sock_free(struct svc_xprt *xprt) | |
1571 | { | |
1572 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1573 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1574 | ||
755cceab TT |
1575 | if (svsk->sk_sock->file) |
1576 | sockfd_put(svsk->sk_sock); | |
1577 | else | |
1578 | sock_release(svsk->sk_sock); | |
1579 | kfree(svsk); | |
1580 | } | |
7652e5a0 | 1581 | |
9e00abc3 | 1582 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
7652e5a0 | 1583 | /* |
1f11a034 | 1584 | * Create a back channel svc_xprt which shares the fore channel socket. |
7652e5a0 | 1585 | */ |
1f11a034 AA |
1586 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, |
1587 | int protocol, | |
1588 | struct net *net, | |
1589 | struct sockaddr *sin, int len, | |
1590 | int flags) | |
7652e5a0 BH |
1591 | { |
1592 | struct svc_sock *svsk; | |
1f11a034 AA |
1593 | struct svc_xprt *xprt; |
1594 | ||
1595 | if (protocol != IPPROTO_TCP) { | |
1596 | printk(KERN_WARNING "svc: only TCP sockets" | |
1597 | " supported on shared back channel\n"); | |
1598 | return ERR_PTR(-EINVAL); | |
1599 | } | |
7652e5a0 | 1600 | |
7652e5a0 BH |
1601 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1602 | if (!svsk) | |
1f11a034 | 1603 | return ERR_PTR(-ENOMEM); |
7652e5a0 BH |
1604 | |
1605 | xprt = &svsk->sk_xprt; | |
bd4620dd | 1606 | svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); |
1f11a034 | 1607 | |
4a19de0f | 1608 | serv->sv_bc_xprt = xprt; |
1f11a034 | 1609 | |
7652e5a0 BH |
1610 | return xprt; |
1611 | } | |
7652e5a0 BH |
1612 | |
1613 | /* | |
1f11a034 | 1614 | * Free a back channel svc_sock. |
7652e5a0 | 1615 | */ |
1f11a034 | 1616 | static void svc_bc_sock_free(struct svc_xprt *xprt) |
7652e5a0 | 1617 | { |
778be232 | 1618 | if (xprt) |
7652e5a0 BH |
1619 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); |
1620 | } | |
9e00abc3 | 1621 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |