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); |
676d2369 | 63 | static void svc_udp_data_ready(struct sock *); |
1da177e4 LT |
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; |
c2bb06db | 294 | #if IS_ENABLED(CONFIG_IPV6) |
58de2f86 CL |
295 | case PF_INET6: |
296 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", | |
017cb47f | 297 | proto_name, |
efe4208f | 298 | &sk->sk_v6_rcv_saddr, |
c720c7e8 | 299 | inet_sk(sk)->inet_num); |
80212d59 | 300 | break; |
c2bb06db | 301 | #endif |
80212d59 | 302 | default: |
e7942b9f | 303 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
017cb47f | 304 | sk->sk_family); |
80212d59 | 305 | } |
e7942b9f CL |
306 | |
307 | if (len >= remaining) { | |
308 | *buf = '\0'; | |
309 | return -ENAMETOOLONG; | |
80212d59 N |
310 | } |
311 | return len; | |
312 | } | |
313 | ||
1da177e4 LT |
314 | /* |
315 | * Generic recvfrom routine. | |
316 | */ | |
0f0257ea TT |
317 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
318 | int buflen) | |
1da177e4 | 319 | { |
57b1d3ba TT |
320 | struct svc_sock *svsk = |
321 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1ba95105 CL |
322 | struct msghdr msg = { |
323 | .msg_flags = MSG_DONTWAIT, | |
324 | }; | |
325 | int len; | |
1da177e4 | 326 | |
260c1d12 TT |
327 | rqstp->rq_xprt_hlen = 0; |
328 | ||
f8d1ff47 | 329 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1ba95105 CL |
330 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
331 | msg.msg_flags); | |
f8d1ff47 TM |
332 | /* If we read a full record, then assume there may be more |
333 | * data to read (stream based sockets only!) | |
334 | */ | |
335 | if (len == buflen) | |
336 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
1da177e4 | 337 | |
1da177e4 | 338 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
1ba95105 | 339 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
340 | return len; |
341 | } | |
342 | ||
31d68ef6 BF |
343 | static int svc_partial_recvfrom(struct svc_rqst *rqstp, |
344 | struct kvec *iov, int nr, | |
345 | int buflen, unsigned int base) | |
346 | { | |
347 | size_t save_iovlen; | |
09acfea5 | 348 | void *save_iovbase; |
31d68ef6 BF |
349 | unsigned int i; |
350 | int ret; | |
351 | ||
352 | if (base == 0) | |
353 | return svc_recvfrom(rqstp, iov, nr, buflen); | |
354 | ||
355 | for (i = 0; i < nr; i++) { | |
356 | if (iov[i].iov_len > base) | |
357 | break; | |
358 | base -= iov[i].iov_len; | |
359 | } | |
360 | save_iovlen = iov[i].iov_len; | |
361 | save_iovbase = iov[i].iov_base; | |
362 | iov[i].iov_len -= base; | |
363 | iov[i].iov_base += base; | |
364 | ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); | |
365 | iov[i].iov_len = save_iovlen; | |
366 | iov[i].iov_base = save_iovbase; | |
367 | return ret; | |
368 | } | |
369 | ||
1da177e4 LT |
370 | /* |
371 | * Set socket snd and rcv buffer lengths | |
372 | */ | |
0f0257ea TT |
373 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
374 | unsigned int rcv) | |
1da177e4 LT |
375 | { |
376 | #if 0 | |
377 | mm_segment_t oldfs; | |
378 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
379 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
380 | (char*)&snd, sizeof(snd)); | |
381 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
382 | (char*)&rcv, sizeof(rcv)); | |
383 | #else | |
384 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
385 | * which isn't acceptable. Until that is made conditional | |
386 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
387 | * DaveM said I could! | |
388 | */ | |
389 | lock_sock(sock->sk); | |
390 | sock->sk->sk_sndbuf = snd * 2; | |
391 | sock->sk->sk_rcvbuf = rcv * 2; | |
47fcb03f | 392 | sock->sk->sk_write_space(sock->sk); |
1da177e4 LT |
393 | release_sock(sock->sk); |
394 | #endif | |
395 | } | |
16e4d93f CL |
396 | |
397 | static int svc_sock_secure_port(struct svc_rqst *rqstp) | |
398 | { | |
399 | return svc_port_is_privileged(svc_addr(rqstp)); | |
400 | } | |
401 | ||
1da177e4 LT |
402 | /* |
403 | * INET callback when data has been received on the socket. | |
404 | */ | |
676d2369 | 405 | static void svc_udp_data_ready(struct sock *sk) |
1da177e4 | 406 | { |
939bb7ef | 407 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 408 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 | 409 | |
939bb7ef | 410 | if (svsk) { |
676d2369 DM |
411 | dprintk("svc: socket %p(inet %p), busy=%d\n", |
412 | svsk, sk, | |
02fc6c36 TT |
413 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
414 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
f6150c3c | 415 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 416 | } |
eaefd110 ED |
417 | if (wq && waitqueue_active(wq)) |
418 | wake_up_interruptible(wq); | |
1da177e4 LT |
419 | } |
420 | ||
421 | /* | |
422 | * INET callback when space is newly available on the socket. | |
423 | */ | |
0f0257ea | 424 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
425 | { |
426 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
eaefd110 | 427 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
428 | |
429 | if (svsk) { | |
430 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 431 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
f6150c3c | 432 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 LT |
433 | } |
434 | ||
eaefd110 | 435 | if (wq && waitqueue_active(wq)) { |
939bb7ef | 436 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 | 437 | svsk); |
eaefd110 | 438 | wake_up_interruptible(wq); |
1da177e4 LT |
439 | } |
440 | } | |
441 | ||
c7fb3f06 TM |
442 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
443 | { | |
444 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
445 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
446 | int required; | |
447 | ||
448 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) | |
449 | return 1; | |
450 | required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; | |
451 | if (sk_stream_wspace(svsk->sk_sk) >= required || | |
452 | (sk_stream_min_wspace(svsk->sk_sk) == 0 && | |
453 | atomic_read(&xprt->xpt_reserved) == 0)) | |
454 | return 1; | |
455 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
456 | return 0; | |
457 | } | |
458 | ||
47fcb03f TM |
459 | static void svc_tcp_write_space(struct sock *sk) |
460 | { | |
c7fb3f06 | 461 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); |
47fcb03f TM |
462 | struct socket *sock = sk->sk_socket; |
463 | ||
c7fb3f06 TM |
464 | if (!sk_stream_is_writeable(sk) || !sock) |
465 | return; | |
466 | if (!svsk || svc_tcp_has_wspace(&svsk->sk_xprt)) | |
47fcb03f TM |
467 | clear_bit(SOCK_NOSPACE, &sock->flags); |
468 | svc_write_space(sk); | |
469 | } | |
470 | ||
51877680 TM |
471 | static void svc_tcp_adjust_wspace(struct svc_xprt *xprt) |
472 | { | |
473 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
474 | ||
475 | if (svc_tcp_has_wspace(xprt)) | |
476 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
477 | } | |
478 | ||
7702ce40 CL |
479 | /* |
480 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
481 | */ | |
482 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
483 | struct cmsghdr *cmh) | |
484 | { | |
485 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
486 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
487 | ||
7702ce40 CL |
488 | if (cmh->cmsg_type != IP_PKTINFO) |
489 | return 0; | |
849a1cf1 MJ |
490 | |
491 | daddr->sin_family = AF_INET; | |
492 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; | |
7702ce40 CL |
493 | return 1; |
494 | } | |
495 | ||
496 | /* | |
73df66f8 | 497 | * See net/ipv6/datagram.c : ip6_datagram_recv_ctl |
7702ce40 CL |
498 | */ |
499 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
500 | struct cmsghdr *cmh) | |
501 | { | |
502 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
503 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
504 | ||
7702ce40 CL |
505 | if (cmh->cmsg_type != IPV6_PKTINFO) |
506 | return 0; | |
849a1cf1 MJ |
507 | |
508 | daddr->sin6_family = AF_INET6; | |
4e3fd7a0 | 509 | daddr->sin6_addr = pki->ipi6_addr; |
849a1cf1 | 510 | daddr->sin6_scope_id = pki->ipi6_ifindex; |
7702ce40 CL |
511 | return 1; |
512 | } | |
513 | ||
9dbc240f TT |
514 | /* |
515 | * Copy the UDP datagram's destination address to the rqstp structure. | |
516 | * The 'destination' address in this case is the address to which the | |
517 | * peer sent the datagram, i.e. our local address. For multihomed | |
518 | * hosts, this can change from msg to msg. Note that only the IP | |
519 | * address changes, the port number should remain the same. | |
520 | */ | |
7702ce40 CL |
521 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
522 | struct cmsghdr *cmh) | |
95756482 | 523 | { |
7702ce40 CL |
524 | switch (cmh->cmsg_level) { |
525 | case SOL_IP: | |
526 | return svc_udp_get_dest_address4(rqstp, cmh); | |
527 | case SOL_IPV6: | |
528 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 529 | } |
7702ce40 CL |
530 | |
531 | return 0; | |
95756482 CL |
532 | } |
533 | ||
1da177e4 LT |
534 | /* |
535 | * Receive a datagram from a UDP socket. | |
536 | */ | |
0f0257ea | 537 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 538 | { |
57b1d3ba TT |
539 | struct svc_sock *svsk = |
540 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 541 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 542 | struct sk_buff *skb; |
bc375ea7 DM |
543 | union { |
544 | struct cmsghdr hdr; | |
545 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
546 | } buffer; | |
547 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
548 | struct msghdr msg = { |
549 | .msg_name = svc_addr(rqstp), | |
550 | .msg_control = cmh, | |
551 | .msg_controllen = sizeof(buffer), | |
552 | .msg_flags = MSG_DONTWAIT, | |
553 | }; | |
abc5c44d CL |
554 | size_t len; |
555 | int err; | |
1da177e4 | 556 | |
02fc6c36 | 557 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
558 | /* udp sockets need large rcvbuf as all pending |
559 | * requests are still in that buffer. sndbuf must | |
560 | * also be large enough that there is enough space | |
3262c816 GB |
561 | * for one reply per thread. We count all threads |
562 | * rather than threads in a particular pool, which | |
563 | * provides an upper bound on the number of threads | |
564 | * which will access the socket. | |
1da177e4 LT |
565 | */ |
566 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
567 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
568 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 569 | |
02fc6c36 | 570 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
571 | skb = NULL; |
572 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
573 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
574 | if (err >= 0) | |
575 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
576 | ||
577 | if (skb == NULL) { | |
578 | if (err != -EAGAIN) { | |
579 | /* possibly an icmp error */ | |
580 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 581 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 582 | } |
9f9d2ebe | 583 | return 0; |
1da177e4 | 584 | } |
9dbc240f | 585 | len = svc_addr_len(svc_addr(rqstp)); |
9dbc240f | 586 | rqstp->rq_addrlen = len; |
b7aa0bf7 ED |
587 | if (skb->tstamp.tv64 == 0) { |
588 | skb->tstamp = ktime_get_real(); | |
cca5172a | 589 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
590 | need that much accuracy */ |
591 | } | |
b7aa0bf7 | 592 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 593 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 594 | |
1da177e4 LT |
595 | len = skb->len - sizeof(struct udphdr); |
596 | rqstp->rq_arg.len = len; | |
597 | ||
95756482 | 598 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 599 | |
7702ce40 | 600 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
e87cc472 JP |
601 | net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", |
602 | cmh->cmsg_level, cmh->cmsg_type); | |
f23abfdb | 603 | goto out_free; |
7a37f578 | 604 | } |
849a1cf1 | 605 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
1da177e4 LT |
606 | |
607 | if (skb_is_nonlinear(skb)) { | |
608 | /* we have to copy */ | |
609 | local_bh_disable(); | |
610 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
611 | local_bh_enable(); | |
612 | /* checksum error */ | |
22911fc5 | 613 | goto out_free; |
1da177e4 LT |
614 | } |
615 | local_bh_enable(); | |
9d410c79 | 616 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
617 | } else { |
618 | /* we can use it in-place */ | |
0f0257ea TT |
619 | rqstp->rq_arg.head[0].iov_base = skb->data + |
620 | sizeof(struct udphdr); | |
1da177e4 | 621 | rqstp->rq_arg.head[0].iov_len = len; |
22911fc5 ED |
622 | if (skb_checksum_complete(skb)) |
623 | goto out_free; | |
5148bf4e | 624 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
625 | } |
626 | ||
627 | rqstp->rq_arg.page_base = 0; | |
628 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
629 | rqstp->rq_arg.head[0].iov_len = len; | |
630 | rqstp->rq_arg.page_len = 0; | |
44524359 | 631 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
632 | } else { |
633 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 634 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 635 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 | 636 | } |
afc59400 | 637 | rqstp->rq_next_page = rqstp->rq_respages+1; |
1da177e4 LT |
638 | |
639 | if (serv->sv_stats) | |
640 | serv->sv_stats->netudpcnt++; | |
641 | ||
642 | return len; | |
f23abfdb BF |
643 | out_free: |
644 | trace_kfree_skb(skb, svc_udp_recvfrom); | |
645 | skb_free_datagram_locked(svsk->sk_sk, skb); | |
646 | return 0; | |
1da177e4 LT |
647 | } |
648 | ||
649 | static int | |
650 | svc_udp_sendto(struct svc_rqst *rqstp) | |
651 | { | |
652 | int error; | |
653 | ||
654 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
655 | if (error == -ECONNREFUSED) | |
656 | /* ICMP error on earlier request. */ | |
657 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
658 | ||
659 | return error; | |
660 | } | |
661 | ||
e831fe65 TT |
662 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
663 | { | |
664 | } | |
665 | ||
323bee32 TT |
666 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
667 | { | |
668 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 669 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
670 | unsigned long required; |
671 | ||
672 | /* | |
673 | * Set the SOCK_NOSPACE flag before checking the available | |
674 | * sock space. | |
675 | */ | |
676 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 677 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
678 | if (required*2 > sock_wspace(svsk->sk_sk)) |
679 | return 0; | |
680 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
681 | return 1; | |
682 | } | |
683 | ||
38a417cc TT |
684 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
685 | { | |
686 | BUG(); | |
687 | return NULL; | |
688 | } | |
689 | ||
b700cbb1 | 690 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
62832c03 | 691 | struct net *net, |
b700cbb1 TT |
692 | struct sockaddr *sa, int salen, |
693 | int flags) | |
694 | { | |
62832c03 | 695 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
b700cbb1 TT |
696 | } |
697 | ||
360d8738 | 698 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 699 | .xpo_create = svc_udp_create, |
5d137990 TT |
700 | .xpo_recvfrom = svc_udp_recvfrom, |
701 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 702 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
703 | .xpo_detach = svc_sock_detach, |
704 | .xpo_free = svc_sock_free, | |
e831fe65 | 705 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 706 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 707 | .xpo_accept = svc_udp_accept, |
16e4d93f | 708 | .xpo_secure_port = svc_sock_secure_port, |
360d8738 TT |
709 | }; |
710 | ||
711 | static struct svc_xprt_class svc_udp_class = { | |
712 | .xcl_name = "udp", | |
b700cbb1 | 713 | .xcl_owner = THIS_MODULE, |
360d8738 | 714 | .xcl_ops = &svc_udp_ops, |
49023155 | 715 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
3c45ddf8 | 716 | .xcl_ident = XPRT_TRANSPORT_UDP, |
360d8738 TT |
717 | }; |
718 | ||
bb5cf160 | 719 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 720 | { |
7702ce40 | 721 | int err, level, optname, one = 1; |
7a37f578 | 722 | |
bd4620dd SK |
723 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
724 | &svsk->sk_xprt, serv); | |
def13d74 | 725 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
726 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
727 | svsk->sk_sk->sk_write_space = svc_write_space; | |
1da177e4 LT |
728 | |
729 | /* initialise setting must have enough space to | |
cca5172a | 730 | * receive and respond to one request. |
1da177e4 LT |
731 | * svc_udp_recvfrom will re-adjust if necessary |
732 | */ | |
733 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
734 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
735 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 736 | |
0f0257ea TT |
737 | /* data might have come in before data_ready set up */ |
738 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 739 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 740 | |
7a37f578 | 741 | /* make sure we get destination address info */ |
7702ce40 CL |
742 | switch (svsk->sk_sk->sk_family) { |
743 | case AF_INET: | |
744 | level = SOL_IP; | |
745 | optname = IP_PKTINFO; | |
746 | break; | |
747 | case AF_INET6: | |
748 | level = SOL_IPV6; | |
749 | optname = IPV6_RECVPKTINFO; | |
750 | break; | |
751 | default: | |
752 | BUG(); | |
753 | } | |
754 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
755 | (char *)&one, sizeof(one)); | |
756 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
1da177e4 LT |
757 | } |
758 | ||
759 | /* | |
760 | * A data_ready event on a listening socket means there's a connection | |
761 | * pending. Do not use state_change as a substitute for it. | |
762 | */ | |
676d2369 | 763 | static void svc_tcp_listen_data_ready(struct sock *sk) |
1da177e4 | 764 | { |
939bb7ef | 765 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 766 | wait_queue_head_t *wq; |
1da177e4 LT |
767 | |
768 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 769 | sk, sk->sk_state); |
1da177e4 | 770 | |
939bb7ef NB |
771 | /* |
772 | * This callback may called twice when a new connection | |
773 | * is established as a child socket inherits everything | |
774 | * from a parent LISTEN socket. | |
775 | * 1) data_ready method of the parent socket will be called | |
776 | * when one of child sockets become ESTABLISHED. | |
777 | * 2) data_ready method of the child socket may be called | |
778 | * when it receives data before the socket is accepted. | |
779 | * In case of 2, we should ignore it silently. | |
780 | */ | |
781 | if (sk->sk_state == TCP_LISTEN) { | |
782 | if (svsk) { | |
02fc6c36 | 783 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 784 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
785 | } else |
786 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 787 | } |
939bb7ef | 788 | |
eaefd110 ED |
789 | wq = sk_sleep(sk); |
790 | if (wq && waitqueue_active(wq)) | |
791 | wake_up_interruptible_all(wq); | |
1da177e4 LT |
792 | } |
793 | ||
794 | /* | |
795 | * A state change on a connected socket means it's dying or dead. | |
796 | */ | |
0f0257ea | 797 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 798 | { |
939bb7ef | 799 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 800 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
801 | |
802 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 803 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 804 | |
939bb7ef | 805 | if (!svsk) |
1da177e4 | 806 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 807 | else { |
02fc6c36 | 808 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 809 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 810 | } |
eaefd110 ED |
811 | if (wq && waitqueue_active(wq)) |
812 | wake_up_interruptible_all(wq); | |
1da177e4 LT |
813 | } |
814 | ||
676d2369 | 815 | static void svc_tcp_data_ready(struct sock *sk) |
1da177e4 | 816 | { |
939bb7ef | 817 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 818 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
819 | |
820 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
821 | sk, sk->sk_user_data); |
822 | if (svsk) { | |
02fc6c36 | 823 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 824 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 825 | } |
eaefd110 ED |
826 | if (wq && waitqueue_active(wq)) |
827 | wake_up_interruptible(wq); | |
1da177e4 LT |
828 | } |
829 | ||
830 | /* | |
831 | * Accept a TCP connection | |
832 | */ | |
38a417cc | 833 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 834 | { |
38a417cc | 835 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f | 836 | struct sockaddr_storage addr; |
837 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 838 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
839 | struct socket *sock = svsk->sk_sock; |
840 | struct socket *newsock; | |
1da177e4 LT |
841 | struct svc_sock *newsvsk; |
842 | int err, slen; | |
5216a8e7 | 843 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
844 | |
845 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
846 | if (!sock) | |
38a417cc | 847 | return NULL; |
1da177e4 | 848 | |
02fc6c36 | 849 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
850 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
851 | if (err < 0) { | |
1da177e4 LT |
852 | if (err == -ENOMEM) |
853 | printk(KERN_WARNING "%s: no more sockets!\n", | |
854 | serv->sv_name); | |
e87cc472 JP |
855 | else if (err != -EAGAIN) |
856 | net_warn_ratelimited("%s: accept failed (err %d)!\n", | |
857 | serv->sv_name, -err); | |
38a417cc | 858 | return NULL; |
1da177e4 | 859 | } |
02fc6c36 | 860 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 861 | |
cdd88b9f | 862 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 | 863 | if (err < 0) { |
e87cc472 JP |
864 | net_warn_ratelimited("%s: peername failed (err %d)!\n", |
865 | serv->sv_name, -err); | |
1da177e4 LT |
866 | goto failed; /* aborted connection or whatever */ |
867 | } | |
868 | ||
869 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
870 | * hosts here, but when we get encryption, the IP of the host won't |
871 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 872 | */ |
cdd88b9f | 873 | if (!svc_port_is_privileged(sin)) { |
a48fd0f9 | 874 | dprintk("%s: connect from unprivileged port: %s\n", |
cca5172a | 875 | serv->sv_name, |
cdd88b9f | 876 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 877 | } |
ad06e4bd | 878 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 879 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
880 | |
881 | /* make sure that a write doesn't block forever when | |
882 | * low on memory | |
883 | */ | |
884 | newsock->sk->sk_sndtimeo = HZ*30; | |
885 | ||
72c35376 BF |
886 | newsvsk = svc_setup_socket(serv, newsock, |
887 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); | |
888 | if (IS_ERR(newsvsk)) | |
1da177e4 | 889 | goto failed; |
9dbc240f | 890 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
891 | err = kernel_getsockname(newsock, sin, &slen); |
892 | if (unlikely(err < 0)) { | |
893 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
894 | slen = offsetof(struct sockaddr, sa_data); | |
895 | } | |
9dbc240f | 896 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 897 | |
ef11ce24 N |
898 | if (sock_is_loopback(newsock->sk)) |
899 | set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
900 | else | |
901 | clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
f9f3cc4f TT |
902 | if (serv->sv_stats) |
903 | serv->sv_stats->nettcpconn++; | |
904 | ||
905 | return &newsvsk->sk_xprt; | |
906 | ||
907 | failed: | |
908 | sock_release(newsock); | |
909 | return NULL; | |
910 | } | |
911 | ||
31d68ef6 BF |
912 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
913 | { | |
914 | unsigned int i, len, npages; | |
915 | ||
8af345f5 | 916 | if (svsk->sk_datalen == 0) |
31d68ef6 | 917 | return 0; |
8af345f5 | 918 | len = svsk->sk_datalen; |
31d68ef6 BF |
919 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
920 | for (i = 0; i < npages; i++) { | |
921 | if (rqstp->rq_pages[i] != NULL) | |
922 | put_page(rqstp->rq_pages[i]); | |
923 | BUG_ON(svsk->sk_pages[i] == NULL); | |
924 | rqstp->rq_pages[i] = svsk->sk_pages[i]; | |
925 | svsk->sk_pages[i] = NULL; | |
926 | } | |
927 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
928 | return len; | |
929 | } | |
930 | ||
931 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
932 | { | |
933 | unsigned int i, len, npages; | |
934 | ||
8af345f5 | 935 | if (svsk->sk_datalen == 0) |
31d68ef6 | 936 | return; |
8af345f5 | 937 | len = svsk->sk_datalen; |
31d68ef6 BF |
938 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
939 | for (i = 0; i < npages; i++) { | |
940 | svsk->sk_pages[i] = rqstp->rq_pages[i]; | |
941 | rqstp->rq_pages[i] = NULL; | |
942 | } | |
943 | } | |
944 | ||
945 | static void svc_tcp_clear_pages(struct svc_sock *svsk) | |
946 | { | |
947 | unsigned int i, len, npages; | |
948 | ||
8af345f5 | 949 | if (svsk->sk_datalen == 0) |
31d68ef6 | 950 | goto out; |
8af345f5 | 951 | len = svsk->sk_datalen; |
31d68ef6 BF |
952 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
953 | for (i = 0; i < npages; i++) { | |
cf3aa02c BF |
954 | if (svsk->sk_pages[i] == NULL) { |
955 | WARN_ON_ONCE(1); | |
956 | continue; | |
957 | } | |
31d68ef6 BF |
958 | put_page(svsk->sk_pages[i]); |
959 | svsk->sk_pages[i] = NULL; | |
960 | } | |
961 | out: | |
962 | svsk->sk_tcplen = 0; | |
8af345f5 | 963 | svsk->sk_datalen = 0; |
31d68ef6 BF |
964 | } |
965 | ||
1da177e4 | 966 | /* |
ad46ccf0 | 967 | * Receive fragment record header. |
8f55f3c0 | 968 | * If we haven't gotten the record length yet, get the next four bytes. |
1da177e4 | 969 | */ |
8f55f3c0 | 970 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
1da177e4 | 971 | { |
bb5cf160 | 972 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
5ee78d48 | 973 | unsigned int want; |
8f55f3c0 | 974 | int len; |
1da177e4 | 975 | |
c0401ea0 | 976 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
1da177e4 LT |
977 | struct kvec iov; |
978 | ||
5ee78d48 | 979 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
1da177e4 LT |
980 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
981 | iov.iov_len = want; | |
982 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
983 | goto error; | |
984 | svsk->sk_tcplen += len; | |
985 | ||
986 | if (len < want) { | |
c0401ea0 CL |
987 | dprintk("svc: short recvfrom while reading record " |
988 | "length (%d of %d)\n", len, want); | |
31d68ef6 | 989 | return -EAGAIN; |
1da177e4 LT |
990 | } |
991 | ||
cc248d4b | 992 | dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk)); |
836fbadb BF |
993 | if (svc_sock_reclen(svsk) + svsk->sk_datalen > |
994 | serv->sv_max_mesg) { | |
3a28e331 BF |
995 | net_notice_ratelimited("RPC: fragment too large: %d\n", |
996 | svc_sock_reclen(svsk)); | |
1da177e4 LT |
997 | goto err_delete; |
998 | } | |
999 | } | |
1000 | ||
cc248d4b | 1001 | return svc_sock_reclen(svsk); |
31d68ef6 BF |
1002 | error: |
1003 | dprintk("RPC: TCP recv_record got %d\n", len); | |
8f55f3c0 | 1004 | return len; |
31d68ef6 | 1005 | err_delete: |
8f55f3c0 | 1006 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
8f55f3c0 AB |
1007 | return -EAGAIN; |
1008 | } | |
1009 | ||
586c52cc | 1010 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
4cfc7e60 | 1011 | { |
586c52cc | 1012 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
4cfc7e60 | 1013 | struct rpc_rqst *req = NULL; |
586c52cc TM |
1014 | struct kvec *src, *dst; |
1015 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
48e6555c BF |
1016 | __be32 xid; |
1017 | __be32 calldir; | |
4cfc7e60 | 1018 | |
4cfc7e60 RI |
1019 | xid = *p++; |
1020 | calldir = *p; | |
1021 | ||
093a1468 | 1022 | if (!bc_xprt) |
586c52cc | 1023 | return -EAGAIN; |
093a1468 TM |
1024 | spin_lock_bh(&bc_xprt->transport_lock); |
1025 | req = xprt_lookup_rqst(bc_xprt, xid); | |
1026 | if (!req) | |
1027 | goto unlock_notfound; | |
586c52cc TM |
1028 | |
1029 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
1030 | /* | |
1031 | * XXX!: cheating for now! Only copying HEAD. | |
1032 | * But we know this is good enough for now (in fact, for any | |
1033 | * callback reply in the forseeable future). | |
1034 | */ | |
1035 | dst = &req->rq_private_buf.head[0]; | |
1036 | src = &rqstp->rq_arg.head[0]; | |
1037 | if (dst->iov_len < src->iov_len) | |
093a1468 | 1038 | goto unlock_eagain; /* whatever; just giving up. */ |
586c52cc | 1039 | memcpy(dst->iov_base, src->iov_base, src->iov_len); |
cc248d4b | 1040 | xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); |
586c52cc | 1041 | rqstp->rq_arg.len = 0; |
093a1468 | 1042 | spin_unlock_bh(&bc_xprt->transport_lock); |
586c52cc | 1043 | return 0; |
093a1468 TM |
1044 | unlock_notfound: |
1045 | printk(KERN_NOTICE | |
1046 | "%s: Got unrecognized reply: " | |
1047 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
1048 | __func__, ntohl(calldir), | |
1049 | bc_xprt, ntohl(xid)); | |
1050 | unlock_eagain: | |
1051 | spin_unlock_bh(&bc_xprt->transport_lock); | |
1052 | return -EAGAIN; | |
586c52cc TM |
1053 | } |
1054 | ||
1055 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) | |
1056 | { | |
1057 | int i = 0; | |
1058 | int t = 0; | |
1059 | ||
1060 | while (t < len) { | |
1061 | vec[i].iov_base = page_address(pages[i]); | |
1062 | vec[i].iov_len = PAGE_SIZE; | |
1063 | i++; | |
1064 | t += PAGE_SIZE; | |
1065 | } | |
1066 | return i; | |
4cfc7e60 RI |
1067 | } |
1068 | ||
836fbadb BF |
1069 | static void svc_tcp_fragment_received(struct svc_sock *svsk) |
1070 | { | |
1071 | /* If we have more data, signal svc_xprt_enqueue() to try again */ | |
836fbadb BF |
1072 | dprintk("svc: TCP %s record (%d bytes)\n", |
1073 | svc_sock_final_rec(svsk) ? "final" : "nonfinal", | |
1074 | svc_sock_reclen(svsk)); | |
1075 | svsk->sk_tcplen = 0; | |
1076 | svsk->sk_reclen = 0; | |
1077 | } | |
31d68ef6 | 1078 | |
8f55f3c0 AB |
1079 | /* |
1080 | * Receive data from a TCP socket. | |
1081 | */ | |
1082 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1083 | { | |
1084 | struct svc_sock *svsk = | |
1085 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1086 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1087 | int len; | |
1088 | struct kvec *vec; | |
31d68ef6 | 1089 | unsigned int want, base; |
586c52cc TM |
1090 | __be32 *p; |
1091 | __be32 calldir; | |
5ee78d48 | 1092 | int pnum; |
8f55f3c0 AB |
1093 | |
1094 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1095 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1096 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1097 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1098 | ||
1099 | len = svc_tcp_recv_record(svsk, rqstp); | |
1100 | if (len < 0) | |
1101 | goto error; | |
1102 | ||
31d68ef6 | 1103 | base = svc_tcp_restore_pages(svsk, rqstp); |
836fbadb | 1104 | want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); |
31d68ef6 | 1105 | |
3cc03b16 | 1106 | vec = rqstp->rq_vec; |
4cfc7e60 | 1107 | |
586c52cc | 1108 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], |
836fbadb | 1109 | svsk->sk_datalen + want); |
586c52cc | 1110 | |
44524359 | 1111 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
afc59400 | 1112 | rqstp->rq_next_page = rqstp->rq_respages + 1; |
1da177e4 LT |
1113 | |
1114 | /* Now receive data */ | |
31d68ef6 | 1115 | len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); |
8af345f5 | 1116 | if (len >= 0) { |
31d68ef6 | 1117 | svsk->sk_tcplen += len; |
8af345f5 BF |
1118 | svsk->sk_datalen += len; |
1119 | } | |
836fbadb | 1120 | if (len != want || !svc_sock_final_rec(svsk)) { |
be1e4444 | 1121 | svc_tcp_save_pages(svsk, rqstp); |
31d68ef6 | 1122 | if (len < 0 && len != -EAGAIN) |
ad46ccf0 | 1123 | goto err_delete; |
836fbadb BF |
1124 | if (len == want) |
1125 | svc_tcp_fragment_received(svsk); | |
1126 | else | |
3a28e331 BF |
1127 | dprintk("svc: incomplete TCP record (%d of %d)\n", |
1128 | (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)), | |
836fbadb | 1129 | svc_sock_reclen(svsk)); |
31d68ef6 BF |
1130 | goto err_noclose; |
1131 | } | |
1da177e4 | 1132 | |
1f691b07 | 1133 | if (svsk->sk_datalen < 8) { |
cf3aa02c | 1134 | svsk->sk_datalen = 0; |
ad46ccf0 | 1135 | goto err_delete; /* client is nuts. */ |
cf3aa02c | 1136 | } |
ad46ccf0 | 1137 | |
836fbadb | 1138 | rqstp->rq_arg.len = svsk->sk_datalen; |
1da177e4 | 1139 | rqstp->rq_arg.page_base = 0; |
5ee78d48 TM |
1140 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1141 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1da177e4 | 1142 | rqstp->rq_arg.page_len = 0; |
5ee78d48 TM |
1143 | } else |
1144 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1da177e4 | 1145 | |
5148bf4e | 1146 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 | 1147 | rqstp->rq_prot = IPPROTO_TCP; |
7501cc2b JL |
1148 | if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags)) |
1149 | set_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1150 | else | |
1151 | clear_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1da177e4 | 1152 | |
586c52cc TM |
1153 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
1154 | calldir = p[1]; | |
8985ef0b | 1155 | if (calldir) |
586c52cc | 1156 | len = receive_cb_reply(svsk, rqstp); |
586c52cc | 1157 | |
1da177e4 | 1158 | /* Reset TCP read info */ |
8af345f5 | 1159 | svsk->sk_datalen = 0; |
836fbadb | 1160 | svc_tcp_fragment_received(svsk); |
0601f793 | 1161 | |
8985ef0b BF |
1162 | if (len < 0) |
1163 | goto error; | |
1da177e4 | 1164 | |
9dbc240f | 1165 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1166 | if (serv->sv_stats) |
1167 | serv->sv_stats->nettcpcnt++; | |
1168 | ||
5ee78d48 | 1169 | return rqstp->rq_arg.len; |
1da177e4 | 1170 | |
8f55f3c0 | 1171 | error: |
31d68ef6 | 1172 | if (len != -EAGAIN) |
ad46ccf0 | 1173 | goto err_delete; |
31d68ef6 | 1174 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); |
9f9d2ebe | 1175 | return 0; |
ad46ccf0 | 1176 | err_delete: |
31d68ef6 BF |
1177 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", |
1178 | svsk->sk_xprt.xpt_server->sv_name, -len); | |
1179 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1180 | err_noclose: | |
9f9d2ebe | 1181 | return 0; /* record not complete */ |
1da177e4 LT |
1182 | } |
1183 | ||
1184 | /* | |
1185 | * Send out data on TCP socket. | |
1186 | */ | |
0f0257ea | 1187 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
1188 | { |
1189 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1190 | int sent; | |
d8ed029d | 1191 | __be32 reclen; |
1da177e4 LT |
1192 | |
1193 | /* Set up the first element of the reply kvec. | |
1194 | * Any other kvecs that may be in use have been taken | |
1195 | * care of by the server implementation itself. | |
1196 | */ | |
1197 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1198 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1199 | ||
1da177e4 LT |
1200 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
1201 | if (sent != xbufp->len) { | |
0f0257ea TT |
1202 | printk(KERN_NOTICE |
1203 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1204 | "- shutting down socket\n", | |
57b1d3ba | 1205 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1206 | (sent<0)?"got error":"sent only", |
1207 | sent, xbufp->len); | |
57b1d3ba | 1208 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1209 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1210 | sent = -EAGAIN; |
1211 | } | |
1212 | return sent; | |
1213 | } | |
1214 | ||
e831fe65 TT |
1215 | /* |
1216 | * Setup response header. TCP has a 4B record length field. | |
1217 | */ | |
1218 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1219 | { | |
1220 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1221 | ||
1222 | /* tcp needs a space for the record length... */ | |
1223 | svc_putnl(resv, 0); | |
1224 | } | |
1225 | ||
b700cbb1 | 1226 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
62832c03 | 1227 | struct net *net, |
b700cbb1 TT |
1228 | struct sockaddr *sa, int salen, |
1229 | int flags) | |
1230 | { | |
62832c03 | 1231 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
b700cbb1 TT |
1232 | } |
1233 | ||
9e00abc3 | 1234 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
1235 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
1236 | struct net *, struct sockaddr *, | |
1237 | int, int); | |
1238 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
1239 | ||
1240 | static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, | |
1241 | struct net *net, | |
1242 | struct sockaddr *sa, int salen, | |
1243 | int flags) | |
1244 | { | |
1245 | return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); | |
1246 | } | |
1247 | ||
1248 | static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) | |
1249 | { | |
1250 | } | |
1251 | ||
1252 | static struct svc_xprt_ops svc_tcp_bc_ops = { | |
1253 | .xpo_create = svc_bc_tcp_create, | |
1254 | .xpo_detach = svc_bc_tcp_sock_detach, | |
1255 | .xpo_free = svc_bc_sock_free, | |
1256 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, | |
16e4d93f | 1257 | .xpo_secure_port = svc_sock_secure_port, |
1f11a034 AA |
1258 | }; |
1259 | ||
1260 | static struct svc_xprt_class svc_tcp_bc_class = { | |
1261 | .xcl_name = "tcp-bc", | |
1262 | .xcl_owner = THIS_MODULE, | |
1263 | .xcl_ops = &svc_tcp_bc_ops, | |
1264 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
1265 | }; | |
16b2d1e1 AA |
1266 | |
1267 | static void svc_init_bc_xprt_sock(void) | |
1268 | { | |
1269 | svc_reg_xprt_class(&svc_tcp_bc_class); | |
1270 | } | |
1271 | ||
1272 | static void svc_cleanup_bc_xprt_sock(void) | |
1273 | { | |
1274 | svc_unreg_xprt_class(&svc_tcp_bc_class); | |
1275 | } | |
9e00abc3 | 1276 | #else /* CONFIG_SUNRPC_BACKCHANNEL */ |
16b2d1e1 AA |
1277 | static void svc_init_bc_xprt_sock(void) |
1278 | { | |
1279 | } | |
1280 | ||
1281 | static void svc_cleanup_bc_xprt_sock(void) | |
1282 | { | |
1283 | } | |
9e00abc3 | 1284 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 1285 | |
360d8738 | 1286 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1287 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1288 | .xpo_recvfrom = svc_tcp_recvfrom, |
1289 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1290 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1291 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1292 | .xpo_free = svc_sock_free, |
e831fe65 | 1293 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1294 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1295 | .xpo_accept = svc_tcp_accept, |
16e4d93f | 1296 | .xpo_secure_port = svc_sock_secure_port, |
51877680 | 1297 | .xpo_adjust_wspace = svc_tcp_adjust_wspace, |
360d8738 TT |
1298 | }; |
1299 | ||
1300 | static struct svc_xprt_class svc_tcp_class = { | |
1301 | .xcl_name = "tcp", | |
b700cbb1 | 1302 | .xcl_owner = THIS_MODULE, |
360d8738 | 1303 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1304 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
3c45ddf8 | 1305 | .xcl_ident = XPRT_TRANSPORT_TCP, |
360d8738 TT |
1306 | }; |
1307 | ||
1308 | void svc_init_xprt_sock(void) | |
1309 | { | |
1310 | svc_reg_xprt_class(&svc_tcp_class); | |
1311 | svc_reg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1312 | svc_init_bc_xprt_sock(); |
360d8738 TT |
1313 | } |
1314 | ||
1315 | void svc_cleanup_xprt_sock(void) | |
1316 | { | |
1317 | svc_unreg_xprt_class(&svc_tcp_class); | |
1318 | svc_unreg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1319 | svc_cleanup_bc_xprt_sock(); |
360d8738 TT |
1320 | } |
1321 | ||
bb5cf160 | 1322 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1323 | { |
1324 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1325 | |
bd4620dd SK |
1326 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
1327 | &svsk->sk_xprt, serv); | |
def13d74 | 1328 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1329 | if (sk->sk_state == TCP_LISTEN) { |
1330 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1331 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1332 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1333 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1334 | } else { |
1335 | dprintk("setting up TCP socket for reading\n"); | |
1336 | sk->sk_state_change = svc_tcp_state_change; | |
1337 | sk->sk_data_ready = svc_tcp_data_ready; | |
47fcb03f | 1338 | sk->sk_write_space = svc_tcp_write_space; |
1da177e4 LT |
1339 | |
1340 | svsk->sk_reclen = 0; | |
1341 | svsk->sk_tcplen = 0; | |
8af345f5 | 1342 | svsk->sk_datalen = 0; |
31d68ef6 | 1343 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
1da177e4 | 1344 | |
b7872fe8 | 1345 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1346 | |
02fc6c36 | 1347 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
cca5172a | 1348 | if (sk->sk_state != TCP_ESTABLISHED) |
02fc6c36 | 1349 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1350 | } |
1351 | } | |
1352 | ||
0f0257ea | 1353 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1354 | { |
1355 | /* | |
1356 | * The number of server threads has changed. Update | |
1357 | * rcvbuf and sndbuf accordingly on all sockets | |
1358 | */ | |
8f3a6de3 | 1359 | struct svc_sock *svsk; |
1da177e4 LT |
1360 | |
1361 | spin_lock_bh(&serv->sv_lock); | |
8f3a6de3 | 1362 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
02fc6c36 | 1363 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1364 | spin_unlock_bh(&serv->sv_lock); |
1365 | } | |
24c3767e | 1366 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1367 | |
1da177e4 LT |
1368 | /* |
1369 | * Initialize socket for RPC use and create svc_sock struct | |
1370 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1371 | */ | |
6b174337 CL |
1372 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1373 | struct socket *sock, | |
72c35376 | 1374 | int flags) |
1da177e4 LT |
1375 | { |
1376 | struct svc_sock *svsk; | |
1377 | struct sock *inet; | |
6b174337 | 1378 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
72c35376 | 1379 | int err = 0; |
1da177e4 LT |
1380 | |
1381 | dprintk("svc: svc_setup_socket %p\n", sock); | |
72c35376 BF |
1382 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1383 | if (!svsk) | |
1384 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
1385 | |
1386 | inet = sock->sk; | |
1387 | ||
1388 | /* Register socket with portmapper */ | |
72c35376 BF |
1389 | if (pmap_register) |
1390 | err = svc_register(serv, sock_net(sock->sk), inet->sk_family, | |
5247fab5 | 1391 | inet->sk_protocol, |
c720c7e8 | 1392 | ntohs(inet_sk(inet)->inet_sport)); |
1da177e4 | 1393 | |
72c35376 | 1394 | if (err < 0) { |
1da177e4 | 1395 | kfree(svsk); |
72c35376 | 1396 | return ERR_PTR(err); |
1da177e4 LT |
1397 | } |
1398 | ||
1da177e4 LT |
1399 | inet->sk_user_data = svsk; |
1400 | svsk->sk_sock = sock; | |
1401 | svsk->sk_sk = inet; | |
1402 | svsk->sk_ostate = inet->sk_state_change; | |
1403 | svsk->sk_odata = inet->sk_data_ready; | |
1404 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1405 | |
1406 | /* Initialize the socket */ | |
1407 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1408 | svc_udp_init(svsk, serv); |
96604398 OK |
1409 | else { |
1410 | /* initialise setting must have enough space to | |
1411 | * receive and respond to one request. | |
1412 | */ | |
1413 | svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, | |
1414 | 4 * serv->sv_max_mesg); | |
bb5cf160 | 1415 | svc_tcp_init(svsk, serv); |
96604398 | 1416 | } |
1da177e4 | 1417 | |
1da177e4 LT |
1418 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
1419 | svsk, svsk->sk_sk); | |
1420 | ||
1da177e4 LT |
1421 | return svsk; |
1422 | } | |
1423 | ||
30646394 SK |
1424 | bool svc_alien_sock(struct net *net, int fd) |
1425 | { | |
1426 | int err; | |
1427 | struct socket *sock = sockfd_lookup(fd, &err); | |
1428 | bool ret = false; | |
1429 | ||
1430 | if (!sock) | |
1431 | goto out; | |
1432 | if (sock_net(sock->sk) != net) | |
1433 | ret = true; | |
1434 | sockfd_put(sock); | |
1435 | out: | |
1436 | return ret; | |
1437 | } | |
1438 | EXPORT_SYMBOL_GPL(svc_alien_sock); | |
1439 | ||
bfba9ab4 CL |
1440 | /** |
1441 | * svc_addsock - add a listener socket to an RPC service | |
1442 | * @serv: pointer to RPC service to which to add a new listener | |
1443 | * @fd: file descriptor of the new listener | |
1444 | * @name_return: pointer to buffer to fill in with name of listener | |
1445 | * @len: size of the buffer | |
1446 | * | |
1447 | * Fills in socket name and returns positive length of name if successful. | |
1448 | * Name is terminated with '\n'. On error, returns a negative errno | |
1449 | * value. | |
1450 | */ | |
1451 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
1452 | const size_t len) | |
b41b66d6 N |
1453 | { |
1454 | int err = 0; | |
1455 | struct socket *so = sockfd_lookup(fd, &err); | |
1456 | struct svc_sock *svsk = NULL; | |
a8e10078 BF |
1457 | struct sockaddr_storage addr; |
1458 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1459 | int salen; | |
b41b66d6 N |
1460 | |
1461 | if (!so) | |
1462 | return err; | |
a8e10078 | 1463 | err = -EAFNOSUPPORT; |
205ba423 | 1464 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
a8e10078 BF |
1465 | goto out; |
1466 | err = -EPROTONOSUPPORT; | |
1467 | if (so->sk->sk_protocol != IPPROTO_TCP && | |
b41b66d6 | 1468 | so->sk->sk_protocol != IPPROTO_UDP) |
a8e10078 BF |
1469 | goto out; |
1470 | err = -EISCONN; | |
1471 | if (so->state > SS_UNCONNECTED) | |
1472 | goto out; | |
1473 | err = -ENOENT; | |
1474 | if (!try_module_get(THIS_MODULE)) | |
1475 | goto out; | |
1476 | svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); | |
1477 | if (IS_ERR(svsk)) { | |
1478 | module_put(THIS_MODULE); | |
1479 | err = PTR_ERR(svsk); | |
1480 | goto out; | |
b41b66d6 | 1481 | } |
a8e10078 BF |
1482 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) |
1483 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
39b55301 | 1484 | svc_add_new_perm_xprt(serv, &svsk->sk_xprt); |
e7942b9f | 1485 | return svc_one_sock_name(svsk, name_return, len); |
a8e10078 BF |
1486 | out: |
1487 | sockfd_put(so); | |
1488 | return err; | |
b41b66d6 N |
1489 | } |
1490 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1491 | ||
1da177e4 LT |
1492 | /* |
1493 | * Create socket for RPC service. | |
1494 | */ | |
b700cbb1 TT |
1495 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1496 | int protocol, | |
62832c03 | 1497 | struct net *net, |
b700cbb1 TT |
1498 | struct sockaddr *sin, int len, |
1499 | int flags) | |
1da177e4 LT |
1500 | { |
1501 | struct svc_sock *svsk; | |
1502 | struct socket *sock; | |
1503 | int error; | |
1504 | int type; | |
9dbc240f TT |
1505 | struct sockaddr_storage addr; |
1506 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1507 | int newlen; | |
c69da774 TM |
1508 | int family; |
1509 | int val; | |
5216a8e7 | 1510 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 1511 | |
ad06e4bd CL |
1512 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1513 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1514 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1515 | |
1516 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1517 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1518 | "sockets supported\n"); | |
b700cbb1 | 1519 | return ERR_PTR(-EINVAL); |
1da177e4 | 1520 | } |
c69da774 | 1521 | |
1da177e4 | 1522 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
c69da774 TM |
1523 | switch (sin->sa_family) { |
1524 | case AF_INET6: | |
1525 | family = PF_INET6; | |
1526 | break; | |
1527 | case AF_INET: | |
1528 | family = PF_INET; | |
1529 | break; | |
1530 | default: | |
1531 | return ERR_PTR(-EINVAL); | |
1532 | } | |
1da177e4 | 1533 | |
14ec63c3 | 1534 | error = __sock_create(net, family, type, protocol, &sock, 1); |
77f1f67a | 1535 | if (error < 0) |
b700cbb1 | 1536 | return ERR_PTR(error); |
1da177e4 | 1537 | |
ed07536e PZ |
1538 | svc_reclassify_socket(sock); |
1539 | ||
c69da774 TM |
1540 | /* |
1541 | * If this is an PF_INET6 listener, we want to avoid | |
1542 | * getting requests from IPv4 remotes. Those should | |
1543 | * be shunted to a PF_INET listener via rpcbind. | |
1544 | */ | |
1545 | val = 1; | |
1546 | if (family == PF_INET6) | |
1547 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, | |
1548 | (char *)&val, sizeof(val)); | |
1549 | ||
18114746 | 1550 | if (type == SOCK_STREAM) |
4a17fd52 | 1551 | sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ |
77f1f67a | 1552 | error = kernel_bind(sock, sin, len); |
18114746 ES |
1553 | if (error < 0) |
1554 | goto bummer; | |
1da177e4 | 1555 | |
9dbc240f TT |
1556 | newlen = len; |
1557 | error = kernel_getsockname(sock, newsin, &newlen); | |
1558 | if (error < 0) | |
1559 | goto bummer; | |
1560 | ||
1da177e4 | 1561 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1562 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1563 | goto bummer; |
1564 | } | |
1565 | ||
72c35376 | 1566 | svsk = svc_setup_socket(serv, sock, flags); |
a8e10078 BF |
1567 | if (IS_ERR(svsk)) { |
1568 | error = PTR_ERR(svsk); | |
1569 | goto bummer; | |
e79eff1f | 1570 | } |
a8e10078 BF |
1571 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
1572 | return (struct svc_xprt *)svsk; | |
1da177e4 LT |
1573 | bummer: |
1574 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1575 | sock_release(sock); | |
b700cbb1 | 1576 | return ERR_PTR(error); |
1da177e4 LT |
1577 | } |
1578 | ||
755cceab TT |
1579 | /* |
1580 | * Detach the svc_sock from the socket so that no | |
1581 | * more callbacks occur. | |
1582 | */ | |
1583 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1584 | { | |
1585 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1586 | struct sock *sk = svsk->sk_sk; | |
eaefd110 | 1587 | wait_queue_head_t *wq; |
755cceab TT |
1588 | |
1589 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1590 | ||
1591 | /* put back the old socket callbacks */ | |
1592 | sk->sk_state_change = svsk->sk_ostate; | |
1593 | sk->sk_data_ready = svsk->sk_odata; | |
1594 | sk->sk_write_space = svsk->sk_owspace; | |
69b6ba37 | 1595 | |
eaefd110 ED |
1596 | wq = sk_sleep(sk); |
1597 | if (wq && waitqueue_active(wq)) | |
1598 | wake_up_interruptible(wq); | |
69b6ba37 TM |
1599 | } |
1600 | ||
1601 | /* | |
1602 | * Disconnect the socket, and reset the callbacks | |
1603 | */ | |
1604 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1605 | { | |
1606 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1607 | ||
1608 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1609 | ||
1610 | svc_sock_detach(xprt); | |
1611 | ||
31d68ef6 BF |
1612 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
1613 | svc_tcp_clear_pages(svsk); | |
69b6ba37 | 1614 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
31d68ef6 | 1615 | } |
755cceab TT |
1616 | } |
1617 | ||
1618 | /* | |
1619 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1620 | */ | |
1621 | static void svc_sock_free(struct svc_xprt *xprt) | |
1622 | { | |
1623 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1624 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1625 | ||
755cceab TT |
1626 | if (svsk->sk_sock->file) |
1627 | sockfd_put(svsk->sk_sock); | |
1628 | else | |
1629 | sock_release(svsk->sk_sock); | |
1630 | kfree(svsk); | |
1631 | } | |
7652e5a0 | 1632 | |
9e00abc3 | 1633 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
7652e5a0 | 1634 | /* |
1f11a034 | 1635 | * Create a back channel svc_xprt which shares the fore channel socket. |
7652e5a0 | 1636 | */ |
1f11a034 AA |
1637 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, |
1638 | int protocol, | |
1639 | struct net *net, | |
1640 | struct sockaddr *sin, int len, | |
1641 | int flags) | |
7652e5a0 BH |
1642 | { |
1643 | struct svc_sock *svsk; | |
1f11a034 AA |
1644 | struct svc_xprt *xprt; |
1645 | ||
1646 | if (protocol != IPPROTO_TCP) { | |
1647 | printk(KERN_WARNING "svc: only TCP sockets" | |
1648 | " supported on shared back channel\n"); | |
1649 | return ERR_PTR(-EINVAL); | |
1650 | } | |
7652e5a0 | 1651 | |
7652e5a0 BH |
1652 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1653 | if (!svsk) | |
1f11a034 | 1654 | return ERR_PTR(-ENOMEM); |
7652e5a0 BH |
1655 | |
1656 | xprt = &svsk->sk_xprt; | |
bd4620dd | 1657 | svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); |
1f11a034 | 1658 | |
4a19de0f | 1659 | serv->sv_bc_xprt = xprt; |
1f11a034 | 1660 | |
7652e5a0 BH |
1661 | return xprt; |
1662 | } | |
7652e5a0 BH |
1663 | |
1664 | /* | |
1f11a034 | 1665 | * Free a back channel svc_sock. |
7652e5a0 | 1666 | */ |
1f11a034 | 1667 | static void svc_bc_sock_free(struct svc_xprt *xprt) |
7652e5a0 | 1668 | { |
778be232 | 1669 | if (xprt) |
7652e5a0 BH |
1670 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); |
1671 | } | |
9e00abc3 | 1672 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |