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; | |
226453d8 | 184 | unsigned int flags = MSG_MORE | MSG_SENDPAGE_NOTLAST; |
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 | ||
d8725c86 | 260 | if (sock_sendmsg(sock, &msg) < 0) |
4cfc7e60 RI |
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 | ||
0442f14b BF |
402 | static bool sunrpc_waitqueue_active(wait_queue_head_t *wq) |
403 | { | |
404 | if (!wq) | |
405 | return false; | |
406 | /* | |
407 | * There should normally be a memory * barrier here--see | |
408 | * wq_has_sleeper(). | |
409 | * | |
410 | * It appears that isn't currently necessary, though, basically | |
411 | * because callers all appear to have sufficient memory barriers | |
412 | * between the time the relevant change is made and the | |
413 | * time they call these callbacks. | |
414 | * | |
415 | * The nfsd code itself doesn't actually explicitly wait on | |
416 | * these waitqueues, but it may wait on them for example in | |
417 | * sendpage() or sendmsg() calls. (And those may be the only | |
418 | * places, since it it uses nonblocking reads.) | |
419 | * | |
420 | * Maybe we should add the memory barriers anyway, but these are | |
421 | * hot paths so we'd need to be convinced there's no sigificant | |
422 | * penalty. | |
423 | */ | |
424 | return waitqueue_active(wq); | |
425 | } | |
426 | ||
1da177e4 LT |
427 | /* |
428 | * INET callback when data has been received on the socket. | |
429 | */ | |
676d2369 | 430 | static void svc_udp_data_ready(struct sock *sk) |
1da177e4 | 431 | { |
939bb7ef | 432 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 433 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 | 434 | |
939bb7ef | 435 | if (svsk) { |
676d2369 DM |
436 | dprintk("svc: socket %p(inet %p), busy=%d\n", |
437 | svsk, sk, | |
02fc6c36 TT |
438 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
439 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
f6150c3c | 440 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 441 | } |
0442f14b | 442 | if (sunrpc_waitqueue_active(wq)) |
eaefd110 | 443 | wake_up_interruptible(wq); |
1da177e4 LT |
444 | } |
445 | ||
446 | /* | |
447 | * INET callback when space is newly available on the socket. | |
448 | */ | |
0f0257ea | 449 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
450 | { |
451 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
eaefd110 | 452 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
453 | |
454 | if (svsk) { | |
455 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 456 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
f6150c3c | 457 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 LT |
458 | } |
459 | ||
0442f14b | 460 | if (sunrpc_waitqueue_active(wq)) { |
939bb7ef | 461 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 | 462 | svsk); |
eaefd110 | 463 | wake_up_interruptible(wq); |
1da177e4 LT |
464 | } |
465 | } | |
466 | ||
c7fb3f06 TM |
467 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
468 | { | |
469 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
470 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
471 | int required; | |
472 | ||
473 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) | |
474 | return 1; | |
475 | required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; | |
476 | if (sk_stream_wspace(svsk->sk_sk) >= required || | |
477 | (sk_stream_min_wspace(svsk->sk_sk) == 0 && | |
478 | atomic_read(&xprt->xpt_reserved) == 0)) | |
479 | return 1; | |
480 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
481 | return 0; | |
482 | } | |
483 | ||
47fcb03f TM |
484 | static void svc_tcp_write_space(struct sock *sk) |
485 | { | |
c7fb3f06 | 486 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); |
47fcb03f TM |
487 | struct socket *sock = sk->sk_socket; |
488 | ||
c7fb3f06 TM |
489 | if (!sk_stream_is_writeable(sk) || !sock) |
490 | return; | |
491 | if (!svsk || svc_tcp_has_wspace(&svsk->sk_xprt)) | |
47fcb03f TM |
492 | clear_bit(SOCK_NOSPACE, &sock->flags); |
493 | svc_write_space(sk); | |
494 | } | |
495 | ||
51877680 TM |
496 | static void svc_tcp_adjust_wspace(struct svc_xprt *xprt) |
497 | { | |
498 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
499 | ||
500 | if (svc_tcp_has_wspace(xprt)) | |
501 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
502 | } | |
503 | ||
7702ce40 CL |
504 | /* |
505 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
506 | */ | |
507 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
508 | struct cmsghdr *cmh) | |
509 | { | |
510 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
511 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
512 | ||
7702ce40 CL |
513 | if (cmh->cmsg_type != IP_PKTINFO) |
514 | return 0; | |
849a1cf1 MJ |
515 | |
516 | daddr->sin_family = AF_INET; | |
517 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; | |
7702ce40 CL |
518 | return 1; |
519 | } | |
520 | ||
521 | /* | |
73df66f8 | 522 | * See net/ipv6/datagram.c : ip6_datagram_recv_ctl |
7702ce40 CL |
523 | */ |
524 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
525 | struct cmsghdr *cmh) | |
526 | { | |
527 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
528 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
529 | ||
7702ce40 CL |
530 | if (cmh->cmsg_type != IPV6_PKTINFO) |
531 | return 0; | |
849a1cf1 MJ |
532 | |
533 | daddr->sin6_family = AF_INET6; | |
4e3fd7a0 | 534 | daddr->sin6_addr = pki->ipi6_addr; |
849a1cf1 | 535 | daddr->sin6_scope_id = pki->ipi6_ifindex; |
7702ce40 CL |
536 | return 1; |
537 | } | |
538 | ||
9dbc240f TT |
539 | /* |
540 | * Copy the UDP datagram's destination address to the rqstp structure. | |
541 | * The 'destination' address in this case is the address to which the | |
542 | * peer sent the datagram, i.e. our local address. For multihomed | |
543 | * hosts, this can change from msg to msg. Note that only the IP | |
544 | * address changes, the port number should remain the same. | |
545 | */ | |
7702ce40 CL |
546 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
547 | struct cmsghdr *cmh) | |
95756482 | 548 | { |
7702ce40 CL |
549 | switch (cmh->cmsg_level) { |
550 | case SOL_IP: | |
551 | return svc_udp_get_dest_address4(rqstp, cmh); | |
552 | case SOL_IPV6: | |
553 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 554 | } |
7702ce40 CL |
555 | |
556 | return 0; | |
95756482 CL |
557 | } |
558 | ||
1da177e4 LT |
559 | /* |
560 | * Receive a datagram from a UDP socket. | |
561 | */ | |
0f0257ea | 562 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 563 | { |
57b1d3ba TT |
564 | struct svc_sock *svsk = |
565 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 566 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 567 | struct sk_buff *skb; |
bc375ea7 DM |
568 | union { |
569 | struct cmsghdr hdr; | |
570 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
571 | } buffer; | |
572 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
573 | struct msghdr msg = { |
574 | .msg_name = svc_addr(rqstp), | |
575 | .msg_control = cmh, | |
576 | .msg_controllen = sizeof(buffer), | |
577 | .msg_flags = MSG_DONTWAIT, | |
578 | }; | |
abc5c44d CL |
579 | size_t len; |
580 | int err; | |
1da177e4 | 581 | |
02fc6c36 | 582 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
583 | /* udp sockets need large rcvbuf as all pending |
584 | * requests are still in that buffer. sndbuf must | |
585 | * also be large enough that there is enough space | |
3262c816 GB |
586 | * for one reply per thread. We count all threads |
587 | * rather than threads in a particular pool, which | |
588 | * provides an upper bound on the number of threads | |
589 | * which will access the socket. | |
1da177e4 LT |
590 | */ |
591 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
592 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
593 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 594 | |
02fc6c36 | 595 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
596 | skb = NULL; |
597 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
598 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
599 | if (err >= 0) | |
600 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
601 | ||
602 | if (skb == NULL) { | |
603 | if (err != -EAGAIN) { | |
604 | /* possibly an icmp error */ | |
605 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 606 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 607 | } |
9f9d2ebe | 608 | return 0; |
1da177e4 | 609 | } |
9dbc240f | 610 | len = svc_addr_len(svc_addr(rqstp)); |
9dbc240f | 611 | rqstp->rq_addrlen = len; |
b7aa0bf7 ED |
612 | if (skb->tstamp.tv64 == 0) { |
613 | skb->tstamp = ktime_get_real(); | |
cca5172a | 614 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
615 | need that much accuracy */ |
616 | } | |
b7aa0bf7 | 617 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 618 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 619 | |
1da177e4 LT |
620 | len = skb->len - sizeof(struct udphdr); |
621 | rqstp->rq_arg.len = len; | |
622 | ||
95756482 | 623 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 624 | |
7702ce40 | 625 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
e87cc472 JP |
626 | net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", |
627 | cmh->cmsg_level, cmh->cmsg_type); | |
f23abfdb | 628 | goto out_free; |
7a37f578 | 629 | } |
849a1cf1 | 630 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
1da177e4 LT |
631 | |
632 | if (skb_is_nonlinear(skb)) { | |
633 | /* we have to copy */ | |
634 | local_bh_disable(); | |
635 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
636 | local_bh_enable(); | |
637 | /* checksum error */ | |
22911fc5 | 638 | goto out_free; |
1da177e4 LT |
639 | } |
640 | local_bh_enable(); | |
9d410c79 | 641 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
642 | } else { |
643 | /* we can use it in-place */ | |
0f0257ea TT |
644 | rqstp->rq_arg.head[0].iov_base = skb->data + |
645 | sizeof(struct udphdr); | |
1da177e4 | 646 | rqstp->rq_arg.head[0].iov_len = len; |
22911fc5 ED |
647 | if (skb_checksum_complete(skb)) |
648 | goto out_free; | |
5148bf4e | 649 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
650 | } |
651 | ||
652 | rqstp->rq_arg.page_base = 0; | |
653 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
654 | rqstp->rq_arg.head[0].iov_len = len; | |
655 | rqstp->rq_arg.page_len = 0; | |
44524359 | 656 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
657 | } else { |
658 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 659 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 660 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 | 661 | } |
afc59400 | 662 | rqstp->rq_next_page = rqstp->rq_respages+1; |
1da177e4 LT |
663 | |
664 | if (serv->sv_stats) | |
665 | serv->sv_stats->netudpcnt++; | |
666 | ||
667 | return len; | |
f23abfdb BF |
668 | out_free: |
669 | trace_kfree_skb(skb, svc_udp_recvfrom); | |
670 | skb_free_datagram_locked(svsk->sk_sk, skb); | |
671 | return 0; | |
1da177e4 LT |
672 | } |
673 | ||
674 | static int | |
675 | svc_udp_sendto(struct svc_rqst *rqstp) | |
676 | { | |
677 | int error; | |
678 | ||
679 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
680 | if (error == -ECONNREFUSED) | |
681 | /* ICMP error on earlier request. */ | |
682 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
683 | ||
684 | return error; | |
685 | } | |
686 | ||
e831fe65 TT |
687 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
688 | { | |
689 | } | |
690 | ||
323bee32 TT |
691 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
692 | { | |
693 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 694 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
695 | unsigned long required; |
696 | ||
697 | /* | |
698 | * Set the SOCK_NOSPACE flag before checking the available | |
699 | * sock space. | |
700 | */ | |
701 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 702 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
703 | if (required*2 > sock_wspace(svsk->sk_sk)) |
704 | return 0; | |
705 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
706 | return 1; | |
707 | } | |
708 | ||
38a417cc TT |
709 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
710 | { | |
711 | BUG(); | |
712 | return NULL; | |
713 | } | |
714 | ||
b700cbb1 | 715 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
62832c03 | 716 | struct net *net, |
b700cbb1 TT |
717 | struct sockaddr *sa, int salen, |
718 | int flags) | |
719 | { | |
62832c03 | 720 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
b700cbb1 TT |
721 | } |
722 | ||
360d8738 | 723 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 724 | .xpo_create = svc_udp_create, |
5d137990 TT |
725 | .xpo_recvfrom = svc_udp_recvfrom, |
726 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 727 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
728 | .xpo_detach = svc_sock_detach, |
729 | .xpo_free = svc_sock_free, | |
e831fe65 | 730 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 731 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 732 | .xpo_accept = svc_udp_accept, |
16e4d93f | 733 | .xpo_secure_port = svc_sock_secure_port, |
360d8738 TT |
734 | }; |
735 | ||
736 | static struct svc_xprt_class svc_udp_class = { | |
737 | .xcl_name = "udp", | |
b700cbb1 | 738 | .xcl_owner = THIS_MODULE, |
360d8738 | 739 | .xcl_ops = &svc_udp_ops, |
49023155 | 740 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
3c45ddf8 | 741 | .xcl_ident = XPRT_TRANSPORT_UDP, |
360d8738 TT |
742 | }; |
743 | ||
bb5cf160 | 744 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 745 | { |
7702ce40 | 746 | int err, level, optname, one = 1; |
7a37f578 | 747 | |
bd4620dd SK |
748 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
749 | &svsk->sk_xprt, serv); | |
def13d74 | 750 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
751 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
752 | svsk->sk_sk->sk_write_space = svc_write_space; | |
1da177e4 LT |
753 | |
754 | /* initialise setting must have enough space to | |
cca5172a | 755 | * receive and respond to one request. |
1da177e4 LT |
756 | * svc_udp_recvfrom will re-adjust if necessary |
757 | */ | |
758 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
759 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
760 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 761 | |
0f0257ea TT |
762 | /* data might have come in before data_ready set up */ |
763 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 764 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 765 | |
7a37f578 | 766 | /* make sure we get destination address info */ |
7702ce40 CL |
767 | switch (svsk->sk_sk->sk_family) { |
768 | case AF_INET: | |
769 | level = SOL_IP; | |
770 | optname = IP_PKTINFO; | |
771 | break; | |
772 | case AF_INET6: | |
773 | level = SOL_IPV6; | |
774 | optname = IPV6_RECVPKTINFO; | |
775 | break; | |
776 | default: | |
777 | BUG(); | |
778 | } | |
779 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
780 | (char *)&one, sizeof(one)); | |
781 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
1da177e4 LT |
782 | } |
783 | ||
784 | /* | |
785 | * A data_ready event on a listening socket means there's a connection | |
786 | * pending. Do not use state_change as a substitute for it. | |
787 | */ | |
676d2369 | 788 | static void svc_tcp_listen_data_ready(struct sock *sk) |
1da177e4 | 789 | { |
939bb7ef | 790 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 791 | wait_queue_head_t *wq; |
1da177e4 LT |
792 | |
793 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 794 | sk, sk->sk_state); |
1da177e4 | 795 | |
939bb7ef NB |
796 | /* |
797 | * This callback may called twice when a new connection | |
798 | * is established as a child socket inherits everything | |
799 | * from a parent LISTEN socket. | |
800 | * 1) data_ready method of the parent socket will be called | |
801 | * when one of child sockets become ESTABLISHED. | |
802 | * 2) data_ready method of the child socket may be called | |
803 | * when it receives data before the socket is accepted. | |
804 | * In case of 2, we should ignore it silently. | |
805 | */ | |
806 | if (sk->sk_state == TCP_LISTEN) { | |
807 | if (svsk) { | |
02fc6c36 | 808 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 809 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
810 | } else |
811 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 812 | } |
939bb7ef | 813 | |
eaefd110 | 814 | wq = sk_sleep(sk); |
0442f14b | 815 | if (sunrpc_waitqueue_active(wq)) |
eaefd110 | 816 | wake_up_interruptible_all(wq); |
1da177e4 LT |
817 | } |
818 | ||
819 | /* | |
820 | * A state change on a connected socket means it's dying or dead. | |
821 | */ | |
0f0257ea | 822 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 823 | { |
939bb7ef | 824 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 825 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
826 | |
827 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 828 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 829 | |
939bb7ef | 830 | if (!svsk) |
1da177e4 | 831 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 832 | else { |
02fc6c36 | 833 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 834 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 835 | } |
0442f14b | 836 | if (sunrpc_waitqueue_active(wq)) |
eaefd110 | 837 | wake_up_interruptible_all(wq); |
1da177e4 LT |
838 | } |
839 | ||
676d2369 | 840 | static void svc_tcp_data_ready(struct sock *sk) |
1da177e4 | 841 | { |
939bb7ef | 842 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 843 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
844 | |
845 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
846 | sk, sk->sk_user_data); |
847 | if (svsk) { | |
02fc6c36 | 848 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 849 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 850 | } |
0442f14b | 851 | if (sunrpc_waitqueue_active(wq)) |
eaefd110 | 852 | wake_up_interruptible(wq); |
1da177e4 LT |
853 | } |
854 | ||
855 | /* | |
856 | * Accept a TCP connection | |
857 | */ | |
38a417cc | 858 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 859 | { |
38a417cc | 860 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f | 861 | struct sockaddr_storage addr; |
862 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 863 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
864 | struct socket *sock = svsk->sk_sock; |
865 | struct socket *newsock; | |
1da177e4 LT |
866 | struct svc_sock *newsvsk; |
867 | int err, slen; | |
5216a8e7 | 868 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
869 | |
870 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
871 | if (!sock) | |
38a417cc | 872 | return NULL; |
1da177e4 | 873 | |
02fc6c36 | 874 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
875 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
876 | if (err < 0) { | |
1da177e4 LT |
877 | if (err == -ENOMEM) |
878 | printk(KERN_WARNING "%s: no more sockets!\n", | |
879 | serv->sv_name); | |
e87cc472 JP |
880 | else if (err != -EAGAIN) |
881 | net_warn_ratelimited("%s: accept failed (err %d)!\n", | |
882 | serv->sv_name, -err); | |
38a417cc | 883 | return NULL; |
1da177e4 | 884 | } |
02fc6c36 | 885 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 886 | |
cdd88b9f | 887 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 | 888 | if (err < 0) { |
e87cc472 JP |
889 | net_warn_ratelimited("%s: peername failed (err %d)!\n", |
890 | serv->sv_name, -err); | |
1da177e4 LT |
891 | goto failed; /* aborted connection or whatever */ |
892 | } | |
893 | ||
894 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
895 | * hosts here, but when we get encryption, the IP of the host won't |
896 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 897 | */ |
cdd88b9f | 898 | if (!svc_port_is_privileged(sin)) { |
a48fd0f9 | 899 | dprintk("%s: connect from unprivileged port: %s\n", |
cca5172a | 900 | serv->sv_name, |
cdd88b9f | 901 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 902 | } |
ad06e4bd | 903 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 904 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
905 | |
906 | /* make sure that a write doesn't block forever when | |
907 | * low on memory | |
908 | */ | |
909 | newsock->sk->sk_sndtimeo = HZ*30; | |
910 | ||
72c35376 BF |
911 | newsvsk = svc_setup_socket(serv, newsock, |
912 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); | |
913 | if (IS_ERR(newsvsk)) | |
1da177e4 | 914 | goto failed; |
9dbc240f | 915 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
916 | err = kernel_getsockname(newsock, sin, &slen); |
917 | if (unlikely(err < 0)) { | |
918 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
919 | slen = offsetof(struct sockaddr, sa_data); | |
920 | } | |
9dbc240f | 921 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 922 | |
ef11ce24 N |
923 | if (sock_is_loopback(newsock->sk)) |
924 | set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
925 | else | |
926 | clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
f9f3cc4f TT |
927 | if (serv->sv_stats) |
928 | serv->sv_stats->nettcpconn++; | |
929 | ||
930 | return &newsvsk->sk_xprt; | |
931 | ||
932 | failed: | |
933 | sock_release(newsock); | |
934 | return NULL; | |
935 | } | |
936 | ||
31d68ef6 BF |
937 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
938 | { | |
939 | unsigned int i, len, npages; | |
940 | ||
8af345f5 | 941 | if (svsk->sk_datalen == 0) |
31d68ef6 | 942 | return 0; |
8af345f5 | 943 | len = svsk->sk_datalen; |
31d68ef6 BF |
944 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
945 | for (i = 0; i < npages; i++) { | |
946 | if (rqstp->rq_pages[i] != NULL) | |
947 | put_page(rqstp->rq_pages[i]); | |
948 | BUG_ON(svsk->sk_pages[i] == NULL); | |
949 | rqstp->rq_pages[i] = svsk->sk_pages[i]; | |
950 | svsk->sk_pages[i] = NULL; | |
951 | } | |
952 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
953 | return len; | |
954 | } | |
955 | ||
956 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
957 | { | |
958 | unsigned int i, len, npages; | |
959 | ||
8af345f5 | 960 | if (svsk->sk_datalen == 0) |
31d68ef6 | 961 | return; |
8af345f5 | 962 | len = svsk->sk_datalen; |
31d68ef6 BF |
963 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
964 | for (i = 0; i < npages; i++) { | |
965 | svsk->sk_pages[i] = rqstp->rq_pages[i]; | |
966 | rqstp->rq_pages[i] = NULL; | |
967 | } | |
968 | } | |
969 | ||
970 | static void svc_tcp_clear_pages(struct svc_sock *svsk) | |
971 | { | |
972 | unsigned int i, len, npages; | |
973 | ||
8af345f5 | 974 | if (svsk->sk_datalen == 0) |
31d68ef6 | 975 | goto out; |
8af345f5 | 976 | len = svsk->sk_datalen; |
31d68ef6 BF |
977 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
978 | for (i = 0; i < npages; i++) { | |
cf3aa02c BF |
979 | if (svsk->sk_pages[i] == NULL) { |
980 | WARN_ON_ONCE(1); | |
981 | continue; | |
982 | } | |
31d68ef6 BF |
983 | put_page(svsk->sk_pages[i]); |
984 | svsk->sk_pages[i] = NULL; | |
985 | } | |
986 | out: | |
987 | svsk->sk_tcplen = 0; | |
8af345f5 | 988 | svsk->sk_datalen = 0; |
31d68ef6 BF |
989 | } |
990 | ||
1da177e4 | 991 | /* |
ad46ccf0 | 992 | * Receive fragment record header. |
8f55f3c0 | 993 | * If we haven't gotten the record length yet, get the next four bytes. |
1da177e4 | 994 | */ |
8f55f3c0 | 995 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
1da177e4 | 996 | { |
bb5cf160 | 997 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
5ee78d48 | 998 | unsigned int want; |
8f55f3c0 | 999 | int len; |
1da177e4 | 1000 | |
c0401ea0 | 1001 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
1da177e4 LT |
1002 | struct kvec iov; |
1003 | ||
5ee78d48 | 1004 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
1da177e4 LT |
1005 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
1006 | iov.iov_len = want; | |
1007 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
1008 | goto error; | |
1009 | svsk->sk_tcplen += len; | |
1010 | ||
1011 | if (len < want) { | |
c0401ea0 CL |
1012 | dprintk("svc: short recvfrom while reading record " |
1013 | "length (%d of %d)\n", len, want); | |
31d68ef6 | 1014 | return -EAGAIN; |
1da177e4 LT |
1015 | } |
1016 | ||
cc248d4b | 1017 | dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk)); |
836fbadb BF |
1018 | if (svc_sock_reclen(svsk) + svsk->sk_datalen > |
1019 | serv->sv_max_mesg) { | |
3a28e331 BF |
1020 | net_notice_ratelimited("RPC: fragment too large: %d\n", |
1021 | svc_sock_reclen(svsk)); | |
1da177e4 LT |
1022 | goto err_delete; |
1023 | } | |
1024 | } | |
1025 | ||
cc248d4b | 1026 | return svc_sock_reclen(svsk); |
31d68ef6 BF |
1027 | error: |
1028 | dprintk("RPC: TCP recv_record got %d\n", len); | |
8f55f3c0 | 1029 | return len; |
31d68ef6 | 1030 | err_delete: |
8f55f3c0 | 1031 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
8f55f3c0 AB |
1032 | return -EAGAIN; |
1033 | } | |
1034 | ||
586c52cc | 1035 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
4cfc7e60 | 1036 | { |
586c52cc | 1037 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
4cfc7e60 | 1038 | struct rpc_rqst *req = NULL; |
586c52cc TM |
1039 | struct kvec *src, *dst; |
1040 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
48e6555c BF |
1041 | __be32 xid; |
1042 | __be32 calldir; | |
4cfc7e60 | 1043 | |
4cfc7e60 RI |
1044 | xid = *p++; |
1045 | calldir = *p; | |
1046 | ||
093a1468 | 1047 | if (!bc_xprt) |
586c52cc | 1048 | return -EAGAIN; |
093a1468 TM |
1049 | spin_lock_bh(&bc_xprt->transport_lock); |
1050 | req = xprt_lookup_rqst(bc_xprt, xid); | |
1051 | if (!req) | |
1052 | goto unlock_notfound; | |
586c52cc TM |
1053 | |
1054 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
1055 | /* | |
1056 | * XXX!: cheating for now! Only copying HEAD. | |
1057 | * But we know this is good enough for now (in fact, for any | |
1058 | * callback reply in the forseeable future). | |
1059 | */ | |
1060 | dst = &req->rq_private_buf.head[0]; | |
1061 | src = &rqstp->rq_arg.head[0]; | |
1062 | if (dst->iov_len < src->iov_len) | |
093a1468 | 1063 | goto unlock_eagain; /* whatever; just giving up. */ |
586c52cc | 1064 | memcpy(dst->iov_base, src->iov_base, src->iov_len); |
cc248d4b | 1065 | xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); |
586c52cc | 1066 | rqstp->rq_arg.len = 0; |
093a1468 | 1067 | spin_unlock_bh(&bc_xprt->transport_lock); |
586c52cc | 1068 | return 0; |
093a1468 TM |
1069 | unlock_notfound: |
1070 | printk(KERN_NOTICE | |
1071 | "%s: Got unrecognized reply: " | |
1072 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
1073 | __func__, ntohl(calldir), | |
1074 | bc_xprt, ntohl(xid)); | |
1075 | unlock_eagain: | |
1076 | spin_unlock_bh(&bc_xprt->transport_lock); | |
1077 | return -EAGAIN; | |
586c52cc TM |
1078 | } |
1079 | ||
1080 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) | |
1081 | { | |
1082 | int i = 0; | |
1083 | int t = 0; | |
1084 | ||
1085 | while (t < len) { | |
1086 | vec[i].iov_base = page_address(pages[i]); | |
1087 | vec[i].iov_len = PAGE_SIZE; | |
1088 | i++; | |
1089 | t += PAGE_SIZE; | |
1090 | } | |
1091 | return i; | |
4cfc7e60 RI |
1092 | } |
1093 | ||
836fbadb BF |
1094 | static void svc_tcp_fragment_received(struct svc_sock *svsk) |
1095 | { | |
1096 | /* If we have more data, signal svc_xprt_enqueue() to try again */ | |
836fbadb BF |
1097 | dprintk("svc: TCP %s record (%d bytes)\n", |
1098 | svc_sock_final_rec(svsk) ? "final" : "nonfinal", | |
1099 | svc_sock_reclen(svsk)); | |
1100 | svsk->sk_tcplen = 0; | |
1101 | svsk->sk_reclen = 0; | |
1102 | } | |
31d68ef6 | 1103 | |
8f55f3c0 AB |
1104 | /* |
1105 | * Receive data from a TCP socket. | |
1106 | */ | |
1107 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1108 | { | |
1109 | struct svc_sock *svsk = | |
1110 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1111 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1112 | int len; | |
1113 | struct kvec *vec; | |
31d68ef6 | 1114 | unsigned int want, base; |
586c52cc TM |
1115 | __be32 *p; |
1116 | __be32 calldir; | |
5ee78d48 | 1117 | int pnum; |
8f55f3c0 AB |
1118 | |
1119 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1120 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1121 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1122 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1123 | ||
1124 | len = svc_tcp_recv_record(svsk, rqstp); | |
1125 | if (len < 0) | |
1126 | goto error; | |
1127 | ||
31d68ef6 | 1128 | base = svc_tcp_restore_pages(svsk, rqstp); |
836fbadb | 1129 | want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); |
31d68ef6 | 1130 | |
3cc03b16 | 1131 | vec = rqstp->rq_vec; |
4cfc7e60 | 1132 | |
586c52cc | 1133 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], |
836fbadb | 1134 | svsk->sk_datalen + want); |
586c52cc | 1135 | |
44524359 | 1136 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
afc59400 | 1137 | rqstp->rq_next_page = rqstp->rq_respages + 1; |
1da177e4 LT |
1138 | |
1139 | /* Now receive data */ | |
31d68ef6 | 1140 | len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); |
8af345f5 | 1141 | if (len >= 0) { |
31d68ef6 | 1142 | svsk->sk_tcplen += len; |
8af345f5 BF |
1143 | svsk->sk_datalen += len; |
1144 | } | |
836fbadb | 1145 | if (len != want || !svc_sock_final_rec(svsk)) { |
be1e4444 | 1146 | svc_tcp_save_pages(svsk, rqstp); |
31d68ef6 | 1147 | if (len < 0 && len != -EAGAIN) |
ad46ccf0 | 1148 | goto err_delete; |
836fbadb BF |
1149 | if (len == want) |
1150 | svc_tcp_fragment_received(svsk); | |
1151 | else | |
3a28e331 BF |
1152 | dprintk("svc: incomplete TCP record (%d of %d)\n", |
1153 | (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)), | |
836fbadb | 1154 | svc_sock_reclen(svsk)); |
31d68ef6 BF |
1155 | goto err_noclose; |
1156 | } | |
1da177e4 | 1157 | |
1f691b07 | 1158 | if (svsk->sk_datalen < 8) { |
cf3aa02c | 1159 | svsk->sk_datalen = 0; |
ad46ccf0 | 1160 | goto err_delete; /* client is nuts. */ |
cf3aa02c | 1161 | } |
ad46ccf0 | 1162 | |
836fbadb | 1163 | rqstp->rq_arg.len = svsk->sk_datalen; |
1da177e4 | 1164 | rqstp->rq_arg.page_base = 0; |
5ee78d48 TM |
1165 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1166 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1da177e4 | 1167 | rqstp->rq_arg.page_len = 0; |
5ee78d48 TM |
1168 | } else |
1169 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1da177e4 | 1170 | |
5148bf4e | 1171 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 | 1172 | rqstp->rq_prot = IPPROTO_TCP; |
7501cc2b JL |
1173 | if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags)) |
1174 | set_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1175 | else | |
1176 | clear_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1da177e4 | 1177 | |
586c52cc TM |
1178 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
1179 | calldir = p[1]; | |
8985ef0b | 1180 | if (calldir) |
586c52cc | 1181 | len = receive_cb_reply(svsk, rqstp); |
586c52cc | 1182 | |
1da177e4 | 1183 | /* Reset TCP read info */ |
8af345f5 | 1184 | svsk->sk_datalen = 0; |
836fbadb | 1185 | svc_tcp_fragment_received(svsk); |
0601f793 | 1186 | |
8985ef0b BF |
1187 | if (len < 0) |
1188 | goto error; | |
1da177e4 | 1189 | |
9dbc240f | 1190 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1191 | if (serv->sv_stats) |
1192 | serv->sv_stats->nettcpcnt++; | |
1193 | ||
5ee78d48 | 1194 | return rqstp->rq_arg.len; |
1da177e4 | 1195 | |
8f55f3c0 | 1196 | error: |
31d68ef6 | 1197 | if (len != -EAGAIN) |
ad46ccf0 | 1198 | goto err_delete; |
31d68ef6 | 1199 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); |
9f9d2ebe | 1200 | return 0; |
ad46ccf0 | 1201 | err_delete: |
31d68ef6 BF |
1202 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", |
1203 | svsk->sk_xprt.xpt_server->sv_name, -len); | |
1204 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1205 | err_noclose: | |
9f9d2ebe | 1206 | return 0; /* record not complete */ |
1da177e4 LT |
1207 | } |
1208 | ||
1209 | /* | |
1210 | * Send out data on TCP socket. | |
1211 | */ | |
0f0257ea | 1212 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
1213 | { |
1214 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1215 | int sent; | |
d8ed029d | 1216 | __be32 reclen; |
1da177e4 LT |
1217 | |
1218 | /* Set up the first element of the reply kvec. | |
1219 | * Any other kvecs that may be in use have been taken | |
1220 | * care of by the server implementation itself. | |
1221 | */ | |
1222 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1223 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1224 | ||
1da177e4 LT |
1225 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
1226 | if (sent != xbufp->len) { | |
0f0257ea TT |
1227 | printk(KERN_NOTICE |
1228 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1229 | "- shutting down socket\n", | |
57b1d3ba | 1230 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1231 | (sent<0)?"got error":"sent only", |
1232 | sent, xbufp->len); | |
57b1d3ba | 1233 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1234 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1235 | sent = -EAGAIN; |
1236 | } | |
1237 | return sent; | |
1238 | } | |
1239 | ||
e831fe65 TT |
1240 | /* |
1241 | * Setup response header. TCP has a 4B record length field. | |
1242 | */ | |
1243 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1244 | { | |
1245 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1246 | ||
1247 | /* tcp needs a space for the record length... */ | |
1248 | svc_putnl(resv, 0); | |
1249 | } | |
1250 | ||
b700cbb1 | 1251 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
62832c03 | 1252 | struct net *net, |
b700cbb1 TT |
1253 | struct sockaddr *sa, int salen, |
1254 | int flags) | |
1255 | { | |
62832c03 | 1256 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
b700cbb1 TT |
1257 | } |
1258 | ||
9e00abc3 | 1259 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
1260 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
1261 | struct net *, struct sockaddr *, | |
1262 | int, int); | |
1263 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
1264 | ||
1265 | static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, | |
1266 | struct net *net, | |
1267 | struct sockaddr *sa, int salen, | |
1268 | int flags) | |
1269 | { | |
1270 | return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); | |
1271 | } | |
1272 | ||
1273 | static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) | |
1274 | { | |
1275 | } | |
1276 | ||
1277 | static struct svc_xprt_ops svc_tcp_bc_ops = { | |
1278 | .xpo_create = svc_bc_tcp_create, | |
1279 | .xpo_detach = svc_bc_tcp_sock_detach, | |
1280 | .xpo_free = svc_bc_sock_free, | |
1281 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, | |
16e4d93f | 1282 | .xpo_secure_port = svc_sock_secure_port, |
1f11a034 AA |
1283 | }; |
1284 | ||
1285 | static struct svc_xprt_class svc_tcp_bc_class = { | |
1286 | .xcl_name = "tcp-bc", | |
1287 | .xcl_owner = THIS_MODULE, | |
1288 | .xcl_ops = &svc_tcp_bc_ops, | |
1289 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
1290 | }; | |
16b2d1e1 AA |
1291 | |
1292 | static void svc_init_bc_xprt_sock(void) | |
1293 | { | |
1294 | svc_reg_xprt_class(&svc_tcp_bc_class); | |
1295 | } | |
1296 | ||
1297 | static void svc_cleanup_bc_xprt_sock(void) | |
1298 | { | |
1299 | svc_unreg_xprt_class(&svc_tcp_bc_class); | |
1300 | } | |
9e00abc3 | 1301 | #else /* CONFIG_SUNRPC_BACKCHANNEL */ |
16b2d1e1 AA |
1302 | static void svc_init_bc_xprt_sock(void) |
1303 | { | |
1304 | } | |
1305 | ||
1306 | static void svc_cleanup_bc_xprt_sock(void) | |
1307 | { | |
1308 | } | |
9e00abc3 | 1309 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 1310 | |
360d8738 | 1311 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1312 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1313 | .xpo_recvfrom = svc_tcp_recvfrom, |
1314 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1315 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1316 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1317 | .xpo_free = svc_sock_free, |
e831fe65 | 1318 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1319 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1320 | .xpo_accept = svc_tcp_accept, |
16e4d93f | 1321 | .xpo_secure_port = svc_sock_secure_port, |
51877680 | 1322 | .xpo_adjust_wspace = svc_tcp_adjust_wspace, |
360d8738 TT |
1323 | }; |
1324 | ||
1325 | static struct svc_xprt_class svc_tcp_class = { | |
1326 | .xcl_name = "tcp", | |
b700cbb1 | 1327 | .xcl_owner = THIS_MODULE, |
360d8738 | 1328 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1329 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
3c45ddf8 | 1330 | .xcl_ident = XPRT_TRANSPORT_TCP, |
360d8738 TT |
1331 | }; |
1332 | ||
1333 | void svc_init_xprt_sock(void) | |
1334 | { | |
1335 | svc_reg_xprt_class(&svc_tcp_class); | |
1336 | svc_reg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1337 | svc_init_bc_xprt_sock(); |
360d8738 TT |
1338 | } |
1339 | ||
1340 | void svc_cleanup_xprt_sock(void) | |
1341 | { | |
1342 | svc_unreg_xprt_class(&svc_tcp_class); | |
1343 | svc_unreg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1344 | svc_cleanup_bc_xprt_sock(); |
360d8738 TT |
1345 | } |
1346 | ||
bb5cf160 | 1347 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1348 | { |
1349 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1350 | |
bd4620dd SK |
1351 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
1352 | &svsk->sk_xprt, serv); | |
def13d74 | 1353 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1354 | if (sk->sk_state == TCP_LISTEN) { |
1355 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1356 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1357 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1358 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1359 | } else { |
1360 | dprintk("setting up TCP socket for reading\n"); | |
1361 | sk->sk_state_change = svc_tcp_state_change; | |
1362 | sk->sk_data_ready = svc_tcp_data_ready; | |
47fcb03f | 1363 | sk->sk_write_space = svc_tcp_write_space; |
1da177e4 LT |
1364 | |
1365 | svsk->sk_reclen = 0; | |
1366 | svsk->sk_tcplen = 0; | |
8af345f5 | 1367 | svsk->sk_datalen = 0; |
31d68ef6 | 1368 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
1da177e4 | 1369 | |
b7872fe8 | 1370 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1371 | |
02fc6c36 | 1372 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
cca5172a | 1373 | if (sk->sk_state != TCP_ESTABLISHED) |
02fc6c36 | 1374 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1375 | } |
1376 | } | |
1377 | ||
0f0257ea | 1378 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1379 | { |
1380 | /* | |
1381 | * The number of server threads has changed. Update | |
1382 | * rcvbuf and sndbuf accordingly on all sockets | |
1383 | */ | |
8f3a6de3 | 1384 | struct svc_sock *svsk; |
1da177e4 LT |
1385 | |
1386 | spin_lock_bh(&serv->sv_lock); | |
8f3a6de3 | 1387 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
02fc6c36 | 1388 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1389 | spin_unlock_bh(&serv->sv_lock); |
1390 | } | |
24c3767e | 1391 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1392 | |
1da177e4 LT |
1393 | /* |
1394 | * Initialize socket for RPC use and create svc_sock struct | |
1da177e4 | 1395 | */ |
6b174337 CL |
1396 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1397 | struct socket *sock, | |
72c35376 | 1398 | int flags) |
1da177e4 LT |
1399 | { |
1400 | struct svc_sock *svsk; | |
1401 | struct sock *inet; | |
6b174337 | 1402 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
72c35376 | 1403 | int err = 0; |
1da177e4 LT |
1404 | |
1405 | dprintk("svc: svc_setup_socket %p\n", sock); | |
72c35376 BF |
1406 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1407 | if (!svsk) | |
1408 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
1409 | |
1410 | inet = sock->sk; | |
1411 | ||
1412 | /* Register socket with portmapper */ | |
72c35376 BF |
1413 | if (pmap_register) |
1414 | err = svc_register(serv, sock_net(sock->sk), inet->sk_family, | |
5247fab5 | 1415 | inet->sk_protocol, |
c720c7e8 | 1416 | ntohs(inet_sk(inet)->inet_sport)); |
1da177e4 | 1417 | |
72c35376 | 1418 | if (err < 0) { |
1da177e4 | 1419 | kfree(svsk); |
72c35376 | 1420 | return ERR_PTR(err); |
1da177e4 LT |
1421 | } |
1422 | ||
1da177e4 LT |
1423 | inet->sk_user_data = svsk; |
1424 | svsk->sk_sock = sock; | |
1425 | svsk->sk_sk = inet; | |
1426 | svsk->sk_ostate = inet->sk_state_change; | |
1427 | svsk->sk_odata = inet->sk_data_ready; | |
1428 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1429 | |
1430 | /* Initialize the socket */ | |
1431 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1432 | svc_udp_init(svsk, serv); |
96604398 OK |
1433 | else { |
1434 | /* initialise setting must have enough space to | |
1435 | * receive and respond to one request. | |
1436 | */ | |
1437 | svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, | |
1438 | 4 * serv->sv_max_mesg); | |
bb5cf160 | 1439 | svc_tcp_init(svsk, serv); |
96604398 | 1440 | } |
1da177e4 | 1441 | |
1da177e4 LT |
1442 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
1443 | svsk, svsk->sk_sk); | |
1444 | ||
1da177e4 LT |
1445 | return svsk; |
1446 | } | |
1447 | ||
30646394 SK |
1448 | bool svc_alien_sock(struct net *net, int fd) |
1449 | { | |
1450 | int err; | |
1451 | struct socket *sock = sockfd_lookup(fd, &err); | |
1452 | bool ret = false; | |
1453 | ||
1454 | if (!sock) | |
1455 | goto out; | |
1456 | if (sock_net(sock->sk) != net) | |
1457 | ret = true; | |
1458 | sockfd_put(sock); | |
1459 | out: | |
1460 | return ret; | |
1461 | } | |
1462 | EXPORT_SYMBOL_GPL(svc_alien_sock); | |
1463 | ||
bfba9ab4 CL |
1464 | /** |
1465 | * svc_addsock - add a listener socket to an RPC service | |
1466 | * @serv: pointer to RPC service to which to add a new listener | |
1467 | * @fd: file descriptor of the new listener | |
1468 | * @name_return: pointer to buffer to fill in with name of listener | |
1469 | * @len: size of the buffer | |
1470 | * | |
1471 | * Fills in socket name and returns positive length of name if successful. | |
1472 | * Name is terminated with '\n'. On error, returns a negative errno | |
1473 | * value. | |
1474 | */ | |
1475 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
1476 | const size_t len) | |
b41b66d6 N |
1477 | { |
1478 | int err = 0; | |
1479 | struct socket *so = sockfd_lookup(fd, &err); | |
1480 | struct svc_sock *svsk = NULL; | |
a8e10078 BF |
1481 | struct sockaddr_storage addr; |
1482 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1483 | int salen; | |
b41b66d6 N |
1484 | |
1485 | if (!so) | |
1486 | return err; | |
a8e10078 | 1487 | err = -EAFNOSUPPORT; |
205ba423 | 1488 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
a8e10078 BF |
1489 | goto out; |
1490 | err = -EPROTONOSUPPORT; | |
1491 | if (so->sk->sk_protocol != IPPROTO_TCP && | |
b41b66d6 | 1492 | so->sk->sk_protocol != IPPROTO_UDP) |
a8e10078 BF |
1493 | goto out; |
1494 | err = -EISCONN; | |
1495 | if (so->state > SS_UNCONNECTED) | |
1496 | goto out; | |
1497 | err = -ENOENT; | |
1498 | if (!try_module_get(THIS_MODULE)) | |
1499 | goto out; | |
1500 | svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); | |
1501 | if (IS_ERR(svsk)) { | |
1502 | module_put(THIS_MODULE); | |
1503 | err = PTR_ERR(svsk); | |
1504 | goto out; | |
b41b66d6 | 1505 | } |
a8e10078 BF |
1506 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) |
1507 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
39b55301 | 1508 | svc_add_new_perm_xprt(serv, &svsk->sk_xprt); |
e7942b9f | 1509 | return svc_one_sock_name(svsk, name_return, len); |
a8e10078 BF |
1510 | out: |
1511 | sockfd_put(so); | |
1512 | return err; | |
b41b66d6 N |
1513 | } |
1514 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1515 | ||
1da177e4 LT |
1516 | /* |
1517 | * Create socket for RPC service. | |
1518 | */ | |
b700cbb1 TT |
1519 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1520 | int protocol, | |
62832c03 | 1521 | struct net *net, |
b700cbb1 TT |
1522 | struct sockaddr *sin, int len, |
1523 | int flags) | |
1da177e4 LT |
1524 | { |
1525 | struct svc_sock *svsk; | |
1526 | struct socket *sock; | |
1527 | int error; | |
1528 | int type; | |
9dbc240f TT |
1529 | struct sockaddr_storage addr; |
1530 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1531 | int newlen; | |
c69da774 TM |
1532 | int family; |
1533 | int val; | |
5216a8e7 | 1534 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 1535 | |
ad06e4bd CL |
1536 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1537 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1538 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1539 | |
1540 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1541 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1542 | "sockets supported\n"); | |
b700cbb1 | 1543 | return ERR_PTR(-EINVAL); |
1da177e4 | 1544 | } |
c69da774 | 1545 | |
1da177e4 | 1546 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
c69da774 TM |
1547 | switch (sin->sa_family) { |
1548 | case AF_INET6: | |
1549 | family = PF_INET6; | |
1550 | break; | |
1551 | case AF_INET: | |
1552 | family = PF_INET; | |
1553 | break; | |
1554 | default: | |
1555 | return ERR_PTR(-EINVAL); | |
1556 | } | |
1da177e4 | 1557 | |
14ec63c3 | 1558 | error = __sock_create(net, family, type, protocol, &sock, 1); |
77f1f67a | 1559 | if (error < 0) |
b700cbb1 | 1560 | return ERR_PTR(error); |
1da177e4 | 1561 | |
ed07536e PZ |
1562 | svc_reclassify_socket(sock); |
1563 | ||
c69da774 TM |
1564 | /* |
1565 | * If this is an PF_INET6 listener, we want to avoid | |
1566 | * getting requests from IPv4 remotes. Those should | |
1567 | * be shunted to a PF_INET listener via rpcbind. | |
1568 | */ | |
1569 | val = 1; | |
1570 | if (family == PF_INET6) | |
1571 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, | |
1572 | (char *)&val, sizeof(val)); | |
1573 | ||
18114746 | 1574 | if (type == SOCK_STREAM) |
4a17fd52 | 1575 | sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ |
77f1f67a | 1576 | error = kernel_bind(sock, sin, len); |
18114746 ES |
1577 | if (error < 0) |
1578 | goto bummer; | |
1da177e4 | 1579 | |
9dbc240f TT |
1580 | newlen = len; |
1581 | error = kernel_getsockname(sock, newsin, &newlen); | |
1582 | if (error < 0) | |
1583 | goto bummer; | |
1584 | ||
1da177e4 | 1585 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1586 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1587 | goto bummer; |
1588 | } | |
1589 | ||
72c35376 | 1590 | svsk = svc_setup_socket(serv, sock, flags); |
a8e10078 BF |
1591 | if (IS_ERR(svsk)) { |
1592 | error = PTR_ERR(svsk); | |
1593 | goto bummer; | |
e79eff1f | 1594 | } |
a8e10078 BF |
1595 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
1596 | return (struct svc_xprt *)svsk; | |
1da177e4 LT |
1597 | bummer: |
1598 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1599 | sock_release(sock); | |
b700cbb1 | 1600 | return ERR_PTR(error); |
1da177e4 LT |
1601 | } |
1602 | ||
755cceab TT |
1603 | /* |
1604 | * Detach the svc_sock from the socket so that no | |
1605 | * more callbacks occur. | |
1606 | */ | |
1607 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1608 | { | |
1609 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1610 | struct sock *sk = svsk->sk_sk; | |
eaefd110 | 1611 | wait_queue_head_t *wq; |
755cceab TT |
1612 | |
1613 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1614 | ||
1615 | /* put back the old socket callbacks */ | |
1616 | sk->sk_state_change = svsk->sk_ostate; | |
1617 | sk->sk_data_ready = svsk->sk_odata; | |
1618 | sk->sk_write_space = svsk->sk_owspace; | |
69b6ba37 | 1619 | |
eaefd110 | 1620 | wq = sk_sleep(sk); |
0442f14b | 1621 | if (sunrpc_waitqueue_active(wq)) |
eaefd110 | 1622 | wake_up_interruptible(wq); |
69b6ba37 TM |
1623 | } |
1624 | ||
1625 | /* | |
1626 | * Disconnect the socket, and reset the callbacks | |
1627 | */ | |
1628 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1629 | { | |
1630 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1631 | ||
1632 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1633 | ||
1634 | svc_sock_detach(xprt); | |
1635 | ||
31d68ef6 BF |
1636 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
1637 | svc_tcp_clear_pages(svsk); | |
69b6ba37 | 1638 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
31d68ef6 | 1639 | } |
755cceab TT |
1640 | } |
1641 | ||
1642 | /* | |
1643 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1644 | */ | |
1645 | static void svc_sock_free(struct svc_xprt *xprt) | |
1646 | { | |
1647 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1648 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1649 | ||
755cceab TT |
1650 | if (svsk->sk_sock->file) |
1651 | sockfd_put(svsk->sk_sock); | |
1652 | else | |
1653 | sock_release(svsk->sk_sock); | |
1654 | kfree(svsk); | |
1655 | } | |
7652e5a0 | 1656 | |
9e00abc3 | 1657 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
7652e5a0 | 1658 | /* |
1f11a034 | 1659 | * Create a back channel svc_xprt which shares the fore channel socket. |
7652e5a0 | 1660 | */ |
1f11a034 AA |
1661 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, |
1662 | int protocol, | |
1663 | struct net *net, | |
1664 | struct sockaddr *sin, int len, | |
1665 | int flags) | |
7652e5a0 BH |
1666 | { |
1667 | struct svc_sock *svsk; | |
1f11a034 AA |
1668 | struct svc_xprt *xprt; |
1669 | ||
1670 | if (protocol != IPPROTO_TCP) { | |
1671 | printk(KERN_WARNING "svc: only TCP sockets" | |
1672 | " supported on shared back channel\n"); | |
1673 | return ERR_PTR(-EINVAL); | |
1674 | } | |
7652e5a0 | 1675 | |
7652e5a0 BH |
1676 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1677 | if (!svsk) | |
1f11a034 | 1678 | return ERR_PTR(-ENOMEM); |
7652e5a0 BH |
1679 | |
1680 | xprt = &svsk->sk_xprt; | |
bd4620dd | 1681 | svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); |
1f11a034 | 1682 | |
4a19de0f | 1683 | serv->sv_bc_xprt = xprt; |
1f11a034 | 1684 | |
7652e5a0 BH |
1685 | return xprt; |
1686 | } | |
7652e5a0 BH |
1687 | |
1688 | /* | |
1f11a034 | 1689 | * Free a back channel svc_sock. |
7652e5a0 | 1690 | */ |
1f11a034 | 1691 | static void svc_bc_sock_free(struct svc_xprt *xprt) |
7652e5a0 | 1692 | { |
778be232 | 1693 | if (xprt) |
7652e5a0 BH |
1694 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); |
1695 | } | |
9e00abc3 | 1696 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |