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> |
850cbadd | 42 | #include <net/udp.h> |
b7872fe8 | 43 | #include <net/tcp.h> |
c752f073 | 44 | #include <net/tcp_states.h> |
7c0f6ba6 | 45 | #include <linux/uaccess.h> |
1da177e4 | 46 | #include <asm/ioctls.h> |
22911fc5 | 47 | #include <trace/events/skb.h> |
1da177e4 LT |
48 | |
49 | #include <linux/sunrpc/types.h> | |
ad06e4bd | 50 | #include <linux/sunrpc/clnt.h> |
1da177e4 | 51 | #include <linux/sunrpc/xdr.h> |
c0401ea0 | 52 | #include <linux/sunrpc/msg_prot.h> |
1da177e4 LT |
53 | #include <linux/sunrpc/svcsock.h> |
54 | #include <linux/sunrpc/stats.h> | |
4cfc7e60 | 55 | #include <linux/sunrpc/xprt.h> |
1da177e4 | 56 | |
177e4f99 HS |
57 | #include "sunrpc.h" |
58 | ||
360d8738 | 59 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 LT |
60 | |
61 | ||
62 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
72c35376 | 63 | int flags); |
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 | 87 | |
fafc4e1e | 88 | if (WARN_ON_ONCE(!sock_allow_reclassification(sk))) |
1b7a1819 WAA |
89 | return; |
90 | ||
ed07536e PZ |
91 | switch (sk->sk_family) { |
92 | case AF_INET: | |
93 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
94 | &svc_slock_key[0], |
95 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
96 | &svc_key[0]); | |
ed07536e PZ |
97 | break; |
98 | ||
99 | case AF_INET6: | |
100 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
101 | &svc_slock_key[1], |
102 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
103 | &svc_key[1]); | |
ed07536e PZ |
104 | break; |
105 | ||
106 | default: | |
107 | BUG(); | |
108 | } | |
109 | } | |
110 | #else | |
0f0257ea | 111 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
112 | { |
113 | } | |
114 | #endif | |
115 | ||
1da177e4 LT |
116 | /* |
117 | * Release an skbuff after use | |
118 | */ | |
5148bf4e | 119 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 120 | { |
5148bf4e | 121 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
122 | |
123 | if (skb) { | |
57b1d3ba TT |
124 | struct svc_sock *svsk = |
125 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 126 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
127 | |
128 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
9d410c79 | 129 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 | 130 | } |
1da177e4 LT |
131 | } |
132 | ||
850cbadd PA |
133 | static void svc_release_udp_skb(struct svc_rqst *rqstp) |
134 | { | |
135 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; | |
136 | ||
137 | if (skb) { | |
138 | rqstp->rq_xprt_ctxt = NULL; | |
139 | ||
140 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
141 | consume_skb(skb); | |
142 | } | |
143 | } | |
144 | ||
b92503b2 CL |
145 | union svc_pktinfo_u { |
146 | struct in_pktinfo pkti; | |
b92503b2 | 147 | struct in6_pktinfo pkti6; |
b92503b2 | 148 | }; |
bc375ea7 DM |
149 | #define SVC_PKTINFO_SPACE \ |
150 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
151 | |
152 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
153 | { | |
57b1d3ba TT |
154 | struct svc_sock *svsk = |
155 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
156 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
157 | case AF_INET: { |
158 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
159 | ||
160 | cmh->cmsg_level = SOL_IP; | |
161 | cmh->cmsg_type = IP_PKTINFO; | |
162 | pki->ipi_ifindex = 0; | |
849a1cf1 MJ |
163 | pki->ipi_spec_dst.s_addr = |
164 | svc_daddr_in(rqstp)->sin_addr.s_addr; | |
b92503b2 CL |
165 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
166 | } | |
167 | break; | |
5a05ed73 | 168 | |
b92503b2 CL |
169 | case AF_INET6: { |
170 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 | 171 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
b92503b2 CL |
172 | |
173 | cmh->cmsg_level = SOL_IPV6; | |
174 | cmh->cmsg_type = IPV6_PKTINFO; | |
849a1cf1 | 175 | pki->ipi6_ifindex = daddr->sin6_scope_id; |
4e3fd7a0 | 176 | pki->ipi6_addr = daddr->sin6_addr; |
b92503b2 CL |
177 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
178 | } | |
179 | break; | |
b92503b2 | 180 | } |
b92503b2 CL |
181 | } |
182 | ||
1da177e4 | 183 | /* |
4cfc7e60 | 184 | * send routine intended to be shared by the fore- and back-channel |
1da177e4 | 185 | */ |
4cfc7e60 RI |
186 | int svc_send_common(struct socket *sock, struct xdr_buf *xdr, |
187 | struct page *headpage, unsigned long headoffset, | |
188 | struct page *tailpage, unsigned long tailoffset) | |
1da177e4 | 189 | { |
1da177e4 LT |
190 | int result; |
191 | int size; | |
192 | struct page **ppage = xdr->pages; | |
193 | size_t base = xdr->page_base; | |
194 | unsigned int pglen = xdr->page_len; | |
226453d8 | 195 | unsigned int flags = MSG_MORE | MSG_SENDPAGE_NOTLAST; |
4cfc7e60 RI |
196 | int slen; |
197 | int len = 0; | |
1da177e4 LT |
198 | |
199 | slen = xdr->len; | |
200 | ||
1da177e4 LT |
201 | /* send head */ |
202 | if (slen == xdr->head[0].iov_len) | |
203 | flags = 0; | |
4cfc7e60 | 204 | len = kernel_sendpage(sock, headpage, headoffset, |
44524359 | 205 | xdr->head[0].iov_len, flags); |
1da177e4 LT |
206 | if (len != xdr->head[0].iov_len) |
207 | goto out; | |
208 | slen -= xdr->head[0].iov_len; | |
209 | if (slen == 0) | |
210 | goto out; | |
211 | ||
212 | /* send page data */ | |
213 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
214 | while (pglen > 0) { | |
215 | if (slen == size) | |
216 | flags = 0; | |
e6242e92 | 217 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
218 | if (result > 0) |
219 | len += result; | |
220 | if (result != size) | |
221 | goto out; | |
222 | slen -= size; | |
223 | pglen -= size; | |
224 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
225 | base = 0; | |
226 | ppage++; | |
227 | } | |
4cfc7e60 | 228 | |
1da177e4 LT |
229 | /* send tail */ |
230 | if (xdr->tail[0].iov_len) { | |
4cfc7e60 RI |
231 | result = kernel_sendpage(sock, tailpage, tailoffset, |
232 | xdr->tail[0].iov_len, 0); | |
1da177e4 LT |
233 | if (result > 0) |
234 | len += result; | |
235 | } | |
4cfc7e60 RI |
236 | |
237 | out: | |
238 | return len; | |
239 | } | |
240 | ||
241 | ||
242 | /* | |
243 | * Generic sendto routine | |
244 | */ | |
245 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
246 | { | |
247 | struct svc_sock *svsk = | |
248 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
249 | struct socket *sock = svsk->sk_sock; | |
250 | union { | |
251 | struct cmsghdr hdr; | |
252 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
253 | } buffer; | |
254 | struct cmsghdr *cmh = &buffer.hdr; | |
255 | int len = 0; | |
256 | unsigned long tailoff; | |
257 | unsigned long headoff; | |
258 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); | |
259 | ||
260 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
261 | struct msghdr msg = { | |
262 | .msg_name = &rqstp->rq_addr, | |
263 | .msg_namelen = rqstp->rq_addrlen, | |
264 | .msg_control = cmh, | |
265 | .msg_controllen = sizeof(buffer), | |
266 | .msg_flags = MSG_MORE, | |
267 | }; | |
268 | ||
269 | svc_set_cmsg_data(rqstp, cmh); | |
270 | ||
d8725c86 | 271 | if (sock_sendmsg(sock, &msg) < 0) |
4cfc7e60 RI |
272 | goto out; |
273 | } | |
274 | ||
275 | tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); | |
276 | headoff = 0; | |
277 | len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, | |
278 | rqstp->rq_respages[0], tailoff); | |
279 | ||
1da177e4 | 280 | out: |
5b5e0928 | 281 | dprintk("svc: socket %p sendto([%p %zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 282 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 283 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
284 | |
285 | return len; | |
286 | } | |
287 | ||
80212d59 N |
288 | /* |
289 | * Report socket names for nfsdfs | |
290 | */ | |
e7942b9f | 291 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
80212d59 | 292 | { |
017cb47f CL |
293 | const struct sock *sk = svsk->sk_sk; |
294 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? | |
295 | "udp" : "tcp"; | |
80212d59 N |
296 | int len; |
297 | ||
017cb47f | 298 | switch (sk->sk_family) { |
e7942b9f CL |
299 | case PF_INET: |
300 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", | |
017cb47f | 301 | proto_name, |
c720c7e8 ED |
302 | &inet_sk(sk)->inet_rcv_saddr, |
303 | inet_sk(sk)->inet_num); | |
80212d59 | 304 | break; |
c2bb06db | 305 | #if IS_ENABLED(CONFIG_IPV6) |
58de2f86 CL |
306 | case PF_INET6: |
307 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", | |
017cb47f | 308 | proto_name, |
efe4208f | 309 | &sk->sk_v6_rcv_saddr, |
c720c7e8 | 310 | inet_sk(sk)->inet_num); |
80212d59 | 311 | break; |
c2bb06db | 312 | #endif |
80212d59 | 313 | default: |
e7942b9f | 314 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
017cb47f | 315 | sk->sk_family); |
80212d59 | 316 | } |
e7942b9f CL |
317 | |
318 | if (len >= remaining) { | |
319 | *buf = '\0'; | |
320 | return -ENAMETOOLONG; | |
80212d59 N |
321 | } |
322 | return len; | |
323 | } | |
324 | ||
1da177e4 LT |
325 | /* |
326 | * Generic recvfrom routine. | |
327 | */ | |
0f0257ea TT |
328 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
329 | int buflen) | |
1da177e4 | 330 | { |
57b1d3ba TT |
331 | struct svc_sock *svsk = |
332 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1ba95105 CL |
333 | struct msghdr msg = { |
334 | .msg_flags = MSG_DONTWAIT, | |
335 | }; | |
336 | int len; | |
1da177e4 | 337 | |
260c1d12 TT |
338 | rqstp->rq_xprt_hlen = 0; |
339 | ||
f8d1ff47 | 340 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1ba95105 CL |
341 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
342 | msg.msg_flags); | |
f8d1ff47 TM |
343 | /* If we read a full record, then assume there may be more |
344 | * data to read (stream based sockets only!) | |
345 | */ | |
346 | if (len == buflen) | |
347 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
1da177e4 | 348 | |
5b5e0928 | 349 | dprintk("svc: socket %p recvfrom(%p, %zu) = %d\n", |
1ba95105 | 350 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
351 | return len; |
352 | } | |
353 | ||
31d68ef6 BF |
354 | static int svc_partial_recvfrom(struct svc_rqst *rqstp, |
355 | struct kvec *iov, int nr, | |
356 | int buflen, unsigned int base) | |
357 | { | |
358 | size_t save_iovlen; | |
09acfea5 | 359 | void *save_iovbase; |
31d68ef6 BF |
360 | unsigned int i; |
361 | int ret; | |
362 | ||
363 | if (base == 0) | |
364 | return svc_recvfrom(rqstp, iov, nr, buflen); | |
365 | ||
366 | for (i = 0; i < nr; i++) { | |
367 | if (iov[i].iov_len > base) | |
368 | break; | |
369 | base -= iov[i].iov_len; | |
370 | } | |
371 | save_iovlen = iov[i].iov_len; | |
372 | save_iovbase = iov[i].iov_base; | |
373 | iov[i].iov_len -= base; | |
374 | iov[i].iov_base += base; | |
375 | ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); | |
376 | iov[i].iov_len = save_iovlen; | |
377 | iov[i].iov_base = save_iovbase; | |
378 | return ret; | |
379 | } | |
380 | ||
1da177e4 LT |
381 | /* |
382 | * Set socket snd and rcv buffer lengths | |
383 | */ | |
0f0257ea TT |
384 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
385 | unsigned int rcv) | |
1da177e4 LT |
386 | { |
387 | #if 0 | |
388 | mm_segment_t oldfs; | |
389 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
390 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
391 | (char*)&snd, sizeof(snd)); | |
392 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
393 | (char*)&rcv, sizeof(rcv)); | |
394 | #else | |
395 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
396 | * which isn't acceptable. Until that is made conditional | |
397 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
398 | * DaveM said I could! | |
399 | */ | |
400 | lock_sock(sock->sk); | |
401 | sock->sk->sk_sndbuf = snd * 2; | |
402 | sock->sk->sk_rcvbuf = rcv * 2; | |
47fcb03f | 403 | sock->sk->sk_write_space(sock->sk); |
1da177e4 LT |
404 | release_sock(sock->sk); |
405 | #endif | |
406 | } | |
16e4d93f CL |
407 | |
408 | static int svc_sock_secure_port(struct svc_rqst *rqstp) | |
409 | { | |
410 | return svc_port_is_privileged(svc_addr(rqstp)); | |
411 | } | |
412 | ||
1da177e4 LT |
413 | /* |
414 | * INET callback when data has been received on the socket. | |
415 | */ | |
fa9251af | 416 | static void svc_data_ready(struct sock *sk) |
1da177e4 | 417 | { |
939bb7ef | 418 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 419 | |
939bb7ef | 420 | if (svsk) { |
676d2369 DM |
421 | dprintk("svc: socket %p(inet %p), busy=%d\n", |
422 | svsk, sk, | |
02fc6c36 | 423 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
eebe53e8 VL |
424 | |
425 | /* Refer to svc_setup_socket() for details. */ | |
426 | rmb(); | |
fa9251af | 427 | svsk->sk_odata(sk); |
4720b070 TM |
428 | if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags)) |
429 | svc_xprt_enqueue(&svsk->sk_xprt); | |
939bb7ef | 430 | } |
1da177e4 LT |
431 | } |
432 | ||
433 | /* | |
434 | * INET callback when space is newly available on the socket. | |
435 | */ | |
0f0257ea | 436 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
437 | { |
438 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
439 | ||
440 | if (svsk) { | |
441 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 442 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
eebe53e8 VL |
443 | |
444 | /* Refer to svc_setup_socket() for details. */ | |
445 | rmb(); | |
fa9251af | 446 | svsk->sk_owspace(sk); |
f6150c3c | 447 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 448 | } |
1da177e4 LT |
449 | } |
450 | ||
c7fb3f06 TM |
451 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
452 | { | |
637600f3 | 453 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
c7fb3f06 TM |
454 | |
455 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) | |
456 | return 1; | |
637600f3 | 457 | return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
51877680 TM |
458 | } |
459 | ||
ea08e392 SM |
460 | static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt) |
461 | { | |
462 | struct svc_sock *svsk; | |
463 | struct socket *sock; | |
464 | struct linger no_linger = { | |
465 | .l_onoff = 1, | |
466 | .l_linger = 0, | |
467 | }; | |
468 | ||
469 | svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
470 | sock = svsk->sk_sock; | |
471 | kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER, | |
472 | (char *)&no_linger, sizeof(no_linger)); | |
473 | } | |
474 | ||
7702ce40 CL |
475 | /* |
476 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
477 | */ | |
478 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
479 | struct cmsghdr *cmh) | |
480 | { | |
481 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
482 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
483 | ||
7702ce40 CL |
484 | if (cmh->cmsg_type != IP_PKTINFO) |
485 | return 0; | |
849a1cf1 MJ |
486 | |
487 | daddr->sin_family = AF_INET; | |
488 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; | |
7702ce40 CL |
489 | return 1; |
490 | } | |
491 | ||
492 | /* | |
73df66f8 | 493 | * See net/ipv6/datagram.c : ip6_datagram_recv_ctl |
7702ce40 CL |
494 | */ |
495 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
496 | struct cmsghdr *cmh) | |
497 | { | |
498 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
499 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
500 | ||
7702ce40 CL |
501 | if (cmh->cmsg_type != IPV6_PKTINFO) |
502 | return 0; | |
849a1cf1 MJ |
503 | |
504 | daddr->sin6_family = AF_INET6; | |
4e3fd7a0 | 505 | daddr->sin6_addr = pki->ipi6_addr; |
849a1cf1 | 506 | daddr->sin6_scope_id = pki->ipi6_ifindex; |
7702ce40 CL |
507 | return 1; |
508 | } | |
509 | ||
9dbc240f TT |
510 | /* |
511 | * Copy the UDP datagram's destination address to the rqstp structure. | |
512 | * The 'destination' address in this case is the address to which the | |
513 | * peer sent the datagram, i.e. our local address. For multihomed | |
514 | * hosts, this can change from msg to msg. Note that only the IP | |
515 | * address changes, the port number should remain the same. | |
516 | */ | |
7702ce40 CL |
517 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
518 | struct cmsghdr *cmh) | |
95756482 | 519 | { |
7702ce40 CL |
520 | switch (cmh->cmsg_level) { |
521 | case SOL_IP: | |
522 | return svc_udp_get_dest_address4(rqstp, cmh); | |
523 | case SOL_IPV6: | |
524 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 525 | } |
7702ce40 CL |
526 | |
527 | return 0; | |
95756482 CL |
528 | } |
529 | ||
1da177e4 LT |
530 | /* |
531 | * Receive a datagram from a UDP socket. | |
532 | */ | |
0f0257ea | 533 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 534 | { |
57b1d3ba TT |
535 | struct svc_sock *svsk = |
536 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 537 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 538 | struct sk_buff *skb; |
bc375ea7 DM |
539 | union { |
540 | struct cmsghdr hdr; | |
541 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
542 | } buffer; | |
543 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
544 | struct msghdr msg = { |
545 | .msg_name = svc_addr(rqstp), | |
546 | .msg_control = cmh, | |
547 | .msg_controllen = sizeof(buffer), | |
548 | .msg_flags = MSG_DONTWAIT, | |
549 | }; | |
abc5c44d CL |
550 | size_t len; |
551 | int err; | |
1da177e4 | 552 | |
02fc6c36 | 553 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
554 | /* udp sockets need large rcvbuf as all pending |
555 | * requests are still in that buffer. sndbuf must | |
556 | * also be large enough that there is enough space | |
3262c816 GB |
557 | * for one reply per thread. We count all threads |
558 | * rather than threads in a particular pool, which | |
559 | * provides an upper bound on the number of threads | |
560 | * which will access the socket. | |
1da177e4 LT |
561 | */ |
562 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
563 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
564 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 565 | |
02fc6c36 | 566 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
567 | skb = NULL; |
568 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
569 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
570 | if (err >= 0) | |
7c13f97f | 571 | skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err); |
05ed690e N |
572 | |
573 | if (skb == NULL) { | |
574 | if (err != -EAGAIN) { | |
575 | /* possibly an icmp error */ | |
576 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 577 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 578 | } |
9f9d2ebe | 579 | return 0; |
1da177e4 | 580 | } |
9dbc240f | 581 | len = svc_addr_len(svc_addr(rqstp)); |
9dbc240f | 582 | rqstp->rq_addrlen = len; |
2456e855 | 583 | if (skb->tstamp == 0) { |
b7aa0bf7 | 584 | skb->tstamp = ktime_get_real(); |
cca5172a | 585 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
586 | need that much accuracy */ |
587 | } | |
b7aa0bf7 | 588 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 589 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 590 | |
1da8c681 | 591 | len = skb->len; |
1da177e4 LT |
592 | rqstp->rq_arg.len = len; |
593 | ||
95756482 | 594 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 595 | |
7702ce40 | 596 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
e87cc472 JP |
597 | net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", |
598 | cmh->cmsg_level, cmh->cmsg_type); | |
f23abfdb | 599 | goto out_free; |
7a37f578 | 600 | } |
849a1cf1 | 601 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
1da177e4 LT |
602 | |
603 | if (skb_is_nonlinear(skb)) { | |
604 | /* we have to copy */ | |
605 | local_bh_disable(); | |
606 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
607 | local_bh_enable(); | |
608 | /* checksum error */ | |
22911fc5 | 609 | goto out_free; |
1da177e4 LT |
610 | } |
611 | local_bh_enable(); | |
850cbadd | 612 | consume_skb(skb); |
1da177e4 LT |
613 | } else { |
614 | /* we can use it in-place */ | |
1da8c681 | 615 | rqstp->rq_arg.head[0].iov_base = skb->data; |
1da177e4 | 616 | rqstp->rq_arg.head[0].iov_len = len; |
22911fc5 ED |
617 | if (skb_checksum_complete(skb)) |
618 | goto out_free; | |
5148bf4e | 619 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
620 | } |
621 | ||
622 | rqstp->rq_arg.page_base = 0; | |
623 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
624 | rqstp->rq_arg.head[0].iov_len = len; | |
625 | rqstp->rq_arg.page_len = 0; | |
44524359 | 626 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
627 | } else { |
628 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 629 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 630 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 | 631 | } |
afc59400 | 632 | rqstp->rq_next_page = rqstp->rq_respages+1; |
1da177e4 LT |
633 | |
634 | if (serv->sv_stats) | |
635 | serv->sv_stats->netudpcnt++; | |
636 | ||
637 | return len; | |
f23abfdb | 638 | out_free: |
850cbadd | 639 | kfree_skb(skb); |
f23abfdb | 640 | return 0; |
1da177e4 LT |
641 | } |
642 | ||
643 | static int | |
644 | svc_udp_sendto(struct svc_rqst *rqstp) | |
645 | { | |
646 | int error; | |
647 | ||
648 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
649 | if (error == -ECONNREFUSED) | |
650 | /* ICMP error on earlier request. */ | |
651 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
652 | ||
653 | return error; | |
654 | } | |
655 | ||
e831fe65 TT |
656 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
657 | { | |
658 | } | |
659 | ||
323bee32 TT |
660 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
661 | { | |
662 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 663 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
664 | unsigned long required; |
665 | ||
666 | /* | |
667 | * Set the SOCK_NOSPACE flag before checking the available | |
668 | * sock space. | |
669 | */ | |
670 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 671 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
672 | if (required*2 > sock_wspace(svsk->sk_sk)) |
673 | return 0; | |
674 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
675 | return 1; | |
676 | } | |
677 | ||
38a417cc TT |
678 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
679 | { | |
680 | BUG(); | |
681 | return NULL; | |
682 | } | |
683 | ||
ea08e392 SM |
684 | static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt) |
685 | { | |
686 | } | |
687 | ||
b700cbb1 | 688 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
62832c03 | 689 | struct net *net, |
b700cbb1 TT |
690 | struct sockaddr *sa, int salen, |
691 | int flags) | |
692 | { | |
62832c03 | 693 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
b700cbb1 TT |
694 | } |
695 | ||
2412e927 | 696 | static const struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 697 | .xpo_create = svc_udp_create, |
5d137990 TT |
698 | .xpo_recvfrom = svc_udp_recvfrom, |
699 | .xpo_sendto = svc_udp_sendto, | |
850cbadd | 700 | .xpo_release_rqst = svc_release_udp_skb, |
755cceab TT |
701 | .xpo_detach = svc_sock_detach, |
702 | .xpo_free = svc_sock_free, | |
e831fe65 | 703 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 704 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 705 | .xpo_accept = svc_udp_accept, |
16e4d93f | 706 | .xpo_secure_port = svc_sock_secure_port, |
ea08e392 | 707 | .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt, |
360d8738 TT |
708 | }; |
709 | ||
710 | static struct svc_xprt_class svc_udp_class = { | |
711 | .xcl_name = "udp", | |
b700cbb1 | 712 | .xcl_owner = THIS_MODULE, |
360d8738 | 713 | .xcl_ops = &svc_udp_ops, |
49023155 | 714 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
3c45ddf8 | 715 | .xcl_ident = XPRT_TRANSPORT_UDP, |
360d8738 TT |
716 | }; |
717 | ||
bb5cf160 | 718 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 719 | { |
7702ce40 | 720 | int err, level, optname, one = 1; |
7a37f578 | 721 | |
bd4620dd SK |
722 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
723 | &svsk->sk_xprt, serv); | |
def13d74 | 724 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
fa9251af | 725 | svsk->sk_sk->sk_data_ready = svc_data_ready; |
1da177e4 | 726 | svsk->sk_sk->sk_write_space = svc_write_space; |
1da177e4 LT |
727 | |
728 | /* initialise setting must have enough space to | |
cca5172a | 729 | * receive and respond to one request. |
1da177e4 LT |
730 | * svc_udp_recvfrom will re-adjust if necessary |
731 | */ | |
732 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
733 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
734 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 735 | |
0f0257ea TT |
736 | /* data might have come in before data_ready set up */ |
737 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 738 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 739 | |
7a37f578 | 740 | /* make sure we get destination address info */ |
7702ce40 CL |
741 | switch (svsk->sk_sk->sk_family) { |
742 | case AF_INET: | |
743 | level = SOL_IP; | |
744 | optname = IP_PKTINFO; | |
745 | break; | |
746 | case AF_INET6: | |
747 | level = SOL_IPV6; | |
748 | optname = IPV6_RECVPKTINFO; | |
749 | break; | |
750 | default: | |
751 | BUG(); | |
752 | } | |
753 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
754 | (char *)&one, sizeof(one)); | |
755 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
1da177e4 LT |
756 | } |
757 | ||
758 | /* | |
759 | * A data_ready event on a listening socket means there's a connection | |
760 | * pending. Do not use state_change as a substitute for it. | |
761 | */ | |
676d2369 | 762 | static void svc_tcp_listen_data_ready(struct sock *sk) |
1da177e4 | 763 | { |
939bb7ef | 764 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
765 | |
766 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 767 | sk, sk->sk_state); |
1da177e4 | 768 | |
eebe53e8 VL |
769 | if (svsk) { |
770 | /* Refer to svc_setup_socket() for details. */ | |
771 | rmb(); | |
fa9251af | 772 | svsk->sk_odata(sk); |
eebe53e8 VL |
773 | } |
774 | ||
939bb7ef NB |
775 | /* |
776 | * This callback may called twice when a new connection | |
777 | * is established as a child socket inherits everything | |
778 | * from a parent LISTEN socket. | |
779 | * 1) data_ready method of the parent socket will be called | |
780 | * when one of child sockets become ESTABLISHED. | |
781 | * 2) data_ready method of the child socket may be called | |
782 | * when it receives data before the socket is accepted. | |
783 | * In case of 2, we should ignore it silently. | |
784 | */ | |
785 | if (sk->sk_state == TCP_LISTEN) { | |
786 | if (svsk) { | |
02fc6c36 | 787 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 788 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
789 | } else |
790 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 791 | } |
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; |
1da177e4 LT |
800 | |
801 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 802 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 803 | |
939bb7ef | 804 | if (!svsk) |
1da177e4 | 805 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 806 | else { |
eebe53e8 VL |
807 | /* Refer to svc_setup_socket() for details. */ |
808 | rmb(); | |
fa9251af | 809 | svsk->sk_ostate(sk); |
b2f21f7d TM |
810 | if (sk->sk_state != TCP_ESTABLISHED) { |
811 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
812 | svc_xprt_enqueue(&svsk->sk_xprt); | |
813 | } | |
1da177e4 | 814 | } |
1da177e4 LT |
815 | } |
816 | ||
817 | /* | |
818 | * Accept a TCP connection | |
819 | */ | |
38a417cc | 820 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 821 | { |
38a417cc | 822 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f | 823 | struct sockaddr_storage addr; |
824 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 825 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
826 | struct socket *sock = svsk->sk_sock; |
827 | struct socket *newsock; | |
1da177e4 LT |
828 | struct svc_sock *newsvsk; |
829 | int err, slen; | |
5216a8e7 | 830 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
831 | |
832 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
833 | if (!sock) | |
38a417cc | 834 | return NULL; |
1da177e4 | 835 | |
02fc6c36 | 836 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
837 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
838 | if (err < 0) { | |
1da177e4 LT |
839 | if (err == -ENOMEM) |
840 | printk(KERN_WARNING "%s: no more sockets!\n", | |
841 | serv->sv_name); | |
e87cc472 JP |
842 | else if (err != -EAGAIN) |
843 | net_warn_ratelimited("%s: accept failed (err %d)!\n", | |
844 | serv->sv_name, -err); | |
38a417cc | 845 | return NULL; |
1da177e4 | 846 | } |
02fc6c36 | 847 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 848 | |
cdd88b9f | 849 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 | 850 | if (err < 0) { |
e87cc472 JP |
851 | net_warn_ratelimited("%s: peername failed (err %d)!\n", |
852 | serv->sv_name, -err); | |
1da177e4 LT |
853 | goto failed; /* aborted connection or whatever */ |
854 | } | |
855 | ||
856 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
857 | * hosts here, but when we get encryption, the IP of the host won't |
858 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 859 | */ |
cdd88b9f | 860 | if (!svc_port_is_privileged(sin)) { |
a48fd0f9 | 861 | dprintk("%s: connect from unprivileged port: %s\n", |
cca5172a | 862 | serv->sv_name, |
cdd88b9f | 863 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 864 | } |
ad06e4bd | 865 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 866 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 867 | |
fa9251af TM |
868 | /* Reset the inherited callbacks before calling svc_setup_socket */ |
869 | newsock->sk->sk_state_change = svsk->sk_ostate; | |
870 | newsock->sk->sk_data_ready = svsk->sk_odata; | |
871 | newsock->sk->sk_write_space = svsk->sk_owspace; | |
872 | ||
1da177e4 LT |
873 | /* make sure that a write doesn't block forever when |
874 | * low on memory | |
875 | */ | |
876 | newsock->sk->sk_sndtimeo = HZ*30; | |
877 | ||
72c35376 BF |
878 | newsvsk = svc_setup_socket(serv, newsock, |
879 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); | |
880 | if (IS_ERR(newsvsk)) | |
1da177e4 | 881 | goto failed; |
9dbc240f | 882 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
883 | err = kernel_getsockname(newsock, sin, &slen); |
884 | if (unlikely(err < 0)) { | |
885 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
886 | slen = offsetof(struct sockaddr, sa_data); | |
887 | } | |
9dbc240f | 888 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 889 | |
ef11ce24 N |
890 | if (sock_is_loopback(newsock->sk)) |
891 | set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
892 | else | |
893 | clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
f9f3cc4f TT |
894 | if (serv->sv_stats) |
895 | serv->sv_stats->nettcpconn++; | |
896 | ||
897 | return &newsvsk->sk_xprt; | |
898 | ||
899 | failed: | |
900 | sock_release(newsock); | |
901 | return NULL; | |
902 | } | |
903 | ||
31d68ef6 BF |
904 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
905 | { | |
906 | unsigned int i, len, npages; | |
907 | ||
8af345f5 | 908 | if (svsk->sk_datalen == 0) |
31d68ef6 | 909 | return 0; |
8af345f5 | 910 | len = svsk->sk_datalen; |
31d68ef6 BF |
911 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
912 | for (i = 0; i < npages; i++) { | |
913 | if (rqstp->rq_pages[i] != NULL) | |
914 | put_page(rqstp->rq_pages[i]); | |
915 | BUG_ON(svsk->sk_pages[i] == NULL); | |
916 | rqstp->rq_pages[i] = svsk->sk_pages[i]; | |
917 | svsk->sk_pages[i] = NULL; | |
918 | } | |
919 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
920 | return len; | |
921 | } | |
922 | ||
923 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
924 | { | |
925 | unsigned int i, len, npages; | |
926 | ||
8af345f5 | 927 | if (svsk->sk_datalen == 0) |
31d68ef6 | 928 | return; |
8af345f5 | 929 | len = svsk->sk_datalen; |
31d68ef6 BF |
930 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
931 | for (i = 0; i < npages; i++) { | |
932 | svsk->sk_pages[i] = rqstp->rq_pages[i]; | |
933 | rqstp->rq_pages[i] = NULL; | |
934 | } | |
935 | } | |
936 | ||
937 | static void svc_tcp_clear_pages(struct svc_sock *svsk) | |
938 | { | |
939 | unsigned int i, len, npages; | |
940 | ||
8af345f5 | 941 | if (svsk->sk_datalen == 0) |
31d68ef6 | 942 | goto out; |
8af345f5 | 943 | len = svsk->sk_datalen; |
31d68ef6 BF |
944 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
945 | for (i = 0; i < npages; i++) { | |
cf3aa02c BF |
946 | if (svsk->sk_pages[i] == NULL) { |
947 | WARN_ON_ONCE(1); | |
948 | continue; | |
949 | } | |
31d68ef6 BF |
950 | put_page(svsk->sk_pages[i]); |
951 | svsk->sk_pages[i] = NULL; | |
952 | } | |
953 | out: | |
954 | svsk->sk_tcplen = 0; | |
8af345f5 | 955 | svsk->sk_datalen = 0; |
31d68ef6 BF |
956 | } |
957 | ||
1da177e4 | 958 | /* |
ad46ccf0 | 959 | * Receive fragment record header. |
8f55f3c0 | 960 | * If we haven't gotten the record length yet, get the next four bytes. |
1da177e4 | 961 | */ |
8f55f3c0 | 962 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
1da177e4 | 963 | { |
bb5cf160 | 964 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
5ee78d48 | 965 | unsigned int want; |
8f55f3c0 | 966 | int len; |
1da177e4 | 967 | |
c0401ea0 | 968 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
1da177e4 LT |
969 | struct kvec iov; |
970 | ||
5ee78d48 | 971 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
1da177e4 LT |
972 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
973 | iov.iov_len = want; | |
974 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
975 | goto error; | |
976 | svsk->sk_tcplen += len; | |
977 | ||
978 | if (len < want) { | |
c0401ea0 CL |
979 | dprintk("svc: short recvfrom while reading record " |
980 | "length (%d of %d)\n", len, want); | |
31d68ef6 | 981 | return -EAGAIN; |
1da177e4 LT |
982 | } |
983 | ||
cc248d4b | 984 | dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk)); |
836fbadb BF |
985 | if (svc_sock_reclen(svsk) + svsk->sk_datalen > |
986 | serv->sv_max_mesg) { | |
3a28e331 BF |
987 | net_notice_ratelimited("RPC: fragment too large: %d\n", |
988 | svc_sock_reclen(svsk)); | |
1da177e4 LT |
989 | goto err_delete; |
990 | } | |
991 | } | |
992 | ||
cc248d4b | 993 | return svc_sock_reclen(svsk); |
31d68ef6 BF |
994 | error: |
995 | dprintk("RPC: TCP recv_record got %d\n", len); | |
8f55f3c0 | 996 | return len; |
31d68ef6 | 997 | err_delete: |
8f55f3c0 | 998 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
8f55f3c0 AB |
999 | return -EAGAIN; |
1000 | } | |
1001 | ||
586c52cc | 1002 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
4cfc7e60 | 1003 | { |
586c52cc | 1004 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
4cfc7e60 | 1005 | struct rpc_rqst *req = NULL; |
586c52cc TM |
1006 | struct kvec *src, *dst; |
1007 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
48e6555c BF |
1008 | __be32 xid; |
1009 | __be32 calldir; | |
4cfc7e60 | 1010 | |
4cfc7e60 RI |
1011 | xid = *p++; |
1012 | calldir = *p; | |
1013 | ||
093a1468 | 1014 | if (!bc_xprt) |
586c52cc | 1015 | return -EAGAIN; |
ce7c252a | 1016 | spin_lock(&bc_xprt->recv_lock); |
093a1468 TM |
1017 | req = xprt_lookup_rqst(bc_xprt, xid); |
1018 | if (!req) | |
1019 | goto unlock_notfound; | |
586c52cc TM |
1020 | |
1021 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
1022 | /* | |
1023 | * XXX!: cheating for now! Only copying HEAD. | |
1024 | * But we know this is good enough for now (in fact, for any | |
1025 | * callback reply in the forseeable future). | |
1026 | */ | |
1027 | dst = &req->rq_private_buf.head[0]; | |
1028 | src = &rqstp->rq_arg.head[0]; | |
1029 | if (dst->iov_len < src->iov_len) | |
093a1468 | 1030 | goto unlock_eagain; /* whatever; just giving up. */ |
586c52cc | 1031 | memcpy(dst->iov_base, src->iov_base, src->iov_len); |
cc248d4b | 1032 | xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); |
586c52cc | 1033 | rqstp->rq_arg.len = 0; |
ce7c252a | 1034 | spin_unlock(&bc_xprt->recv_lock); |
586c52cc | 1035 | return 0; |
093a1468 TM |
1036 | unlock_notfound: |
1037 | printk(KERN_NOTICE | |
1038 | "%s: Got unrecognized reply: " | |
1039 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
1040 | __func__, ntohl(calldir), | |
1041 | bc_xprt, ntohl(xid)); | |
1042 | unlock_eagain: | |
ce7c252a | 1043 | spin_unlock(&bc_xprt->recv_lock); |
093a1468 | 1044 | return -EAGAIN; |
586c52cc TM |
1045 | } |
1046 | ||
1047 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) | |
1048 | { | |
1049 | int i = 0; | |
1050 | int t = 0; | |
1051 | ||
1052 | while (t < len) { | |
1053 | vec[i].iov_base = page_address(pages[i]); | |
1054 | vec[i].iov_len = PAGE_SIZE; | |
1055 | i++; | |
1056 | t += PAGE_SIZE; | |
1057 | } | |
1058 | return i; | |
4cfc7e60 RI |
1059 | } |
1060 | ||
836fbadb BF |
1061 | static void svc_tcp_fragment_received(struct svc_sock *svsk) |
1062 | { | |
1063 | /* If we have more data, signal svc_xprt_enqueue() to try again */ | |
836fbadb BF |
1064 | dprintk("svc: TCP %s record (%d bytes)\n", |
1065 | svc_sock_final_rec(svsk) ? "final" : "nonfinal", | |
1066 | svc_sock_reclen(svsk)); | |
1067 | svsk->sk_tcplen = 0; | |
1068 | svsk->sk_reclen = 0; | |
1069 | } | |
31d68ef6 | 1070 | |
8f55f3c0 AB |
1071 | /* |
1072 | * Receive data from a TCP socket. | |
1073 | */ | |
1074 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1075 | { | |
1076 | struct svc_sock *svsk = | |
1077 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1078 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1079 | int len; | |
1080 | struct kvec *vec; | |
31d68ef6 | 1081 | unsigned int want, base; |
586c52cc TM |
1082 | __be32 *p; |
1083 | __be32 calldir; | |
5ee78d48 | 1084 | int pnum; |
8f55f3c0 AB |
1085 | |
1086 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1087 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1088 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1089 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1090 | ||
1091 | len = svc_tcp_recv_record(svsk, rqstp); | |
1092 | if (len < 0) | |
1093 | goto error; | |
1094 | ||
31d68ef6 | 1095 | base = svc_tcp_restore_pages(svsk, rqstp); |
836fbadb | 1096 | want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); |
31d68ef6 | 1097 | |
3cc03b16 | 1098 | vec = rqstp->rq_vec; |
4cfc7e60 | 1099 | |
586c52cc | 1100 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], |
836fbadb | 1101 | svsk->sk_datalen + want); |
586c52cc | 1102 | |
44524359 | 1103 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
afc59400 | 1104 | rqstp->rq_next_page = rqstp->rq_respages + 1; |
1da177e4 LT |
1105 | |
1106 | /* Now receive data */ | |
31d68ef6 | 1107 | len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); |
8af345f5 | 1108 | if (len >= 0) { |
31d68ef6 | 1109 | svsk->sk_tcplen += len; |
8af345f5 BF |
1110 | svsk->sk_datalen += len; |
1111 | } | |
836fbadb | 1112 | if (len != want || !svc_sock_final_rec(svsk)) { |
be1e4444 | 1113 | svc_tcp_save_pages(svsk, rqstp); |
31d68ef6 | 1114 | if (len < 0 && len != -EAGAIN) |
ad46ccf0 | 1115 | goto err_delete; |
836fbadb BF |
1116 | if (len == want) |
1117 | svc_tcp_fragment_received(svsk); | |
1118 | else | |
3a28e331 BF |
1119 | dprintk("svc: incomplete TCP record (%d of %d)\n", |
1120 | (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)), | |
836fbadb | 1121 | svc_sock_reclen(svsk)); |
31d68ef6 BF |
1122 | goto err_noclose; |
1123 | } | |
1da177e4 | 1124 | |
1f691b07 | 1125 | if (svsk->sk_datalen < 8) { |
cf3aa02c | 1126 | svsk->sk_datalen = 0; |
ad46ccf0 | 1127 | goto err_delete; /* client is nuts. */ |
cf3aa02c | 1128 | } |
ad46ccf0 | 1129 | |
836fbadb | 1130 | rqstp->rq_arg.len = svsk->sk_datalen; |
1da177e4 | 1131 | rqstp->rq_arg.page_base = 0; |
5ee78d48 TM |
1132 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1133 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1da177e4 | 1134 | rqstp->rq_arg.page_len = 0; |
5ee78d48 TM |
1135 | } else |
1136 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1da177e4 | 1137 | |
5148bf4e | 1138 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 | 1139 | rqstp->rq_prot = IPPROTO_TCP; |
7501cc2b JL |
1140 | if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags)) |
1141 | set_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1142 | else | |
1143 | clear_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1da177e4 | 1144 | |
586c52cc TM |
1145 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
1146 | calldir = p[1]; | |
8985ef0b | 1147 | if (calldir) |
586c52cc | 1148 | len = receive_cb_reply(svsk, rqstp); |
586c52cc | 1149 | |
1da177e4 | 1150 | /* Reset TCP read info */ |
8af345f5 | 1151 | svsk->sk_datalen = 0; |
836fbadb | 1152 | svc_tcp_fragment_received(svsk); |
0601f793 | 1153 | |
8985ef0b BF |
1154 | if (len < 0) |
1155 | goto error; | |
1da177e4 | 1156 | |
9dbc240f | 1157 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1158 | if (serv->sv_stats) |
1159 | serv->sv_stats->nettcpcnt++; | |
1160 | ||
5ee78d48 | 1161 | return rqstp->rq_arg.len; |
1da177e4 | 1162 | |
8f55f3c0 | 1163 | error: |
31d68ef6 | 1164 | if (len != -EAGAIN) |
ad46ccf0 | 1165 | goto err_delete; |
31d68ef6 | 1166 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); |
9f9d2ebe | 1167 | return 0; |
ad46ccf0 | 1168 | err_delete: |
31d68ef6 BF |
1169 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", |
1170 | svsk->sk_xprt.xpt_server->sv_name, -len); | |
1171 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1172 | err_noclose: | |
9f9d2ebe | 1173 | return 0; /* record not complete */ |
1da177e4 LT |
1174 | } |
1175 | ||
1176 | /* | |
1177 | * Send out data on TCP socket. | |
1178 | */ | |
0f0257ea | 1179 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
1180 | { |
1181 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1182 | int sent; | |
d8ed029d | 1183 | __be32 reclen; |
1da177e4 LT |
1184 | |
1185 | /* Set up the first element of the reply kvec. | |
1186 | * Any other kvecs that may be in use have been taken | |
1187 | * care of by the server implementation itself. | |
1188 | */ | |
1189 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1190 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1191 | ||
1da177e4 LT |
1192 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
1193 | if (sent != xbufp->len) { | |
0f0257ea TT |
1194 | printk(KERN_NOTICE |
1195 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1196 | "- shutting down socket\n", | |
57b1d3ba | 1197 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1198 | (sent<0)?"got error":"sent only", |
1199 | sent, xbufp->len); | |
57b1d3ba | 1200 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1201 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1202 | sent = -EAGAIN; |
1203 | } | |
1204 | return sent; | |
1205 | } | |
1206 | ||
e831fe65 TT |
1207 | /* |
1208 | * Setup response header. TCP has a 4B record length field. | |
1209 | */ | |
1210 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1211 | { | |
1212 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1213 | ||
1214 | /* tcp needs a space for the record length... */ | |
1215 | svc_putnl(resv, 0); | |
1216 | } | |
1217 | ||
b700cbb1 | 1218 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
62832c03 | 1219 | struct net *net, |
b700cbb1 TT |
1220 | struct sockaddr *sa, int salen, |
1221 | int flags) | |
1222 | { | |
62832c03 | 1223 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
b700cbb1 TT |
1224 | } |
1225 | ||
9e00abc3 | 1226 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
1227 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
1228 | struct net *, struct sockaddr *, | |
1229 | int, int); | |
1230 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
1231 | ||
1232 | static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, | |
1233 | struct net *net, | |
1234 | struct sockaddr *sa, int salen, | |
1235 | int flags) | |
1236 | { | |
1237 | return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); | |
1238 | } | |
1239 | ||
1240 | static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) | |
1241 | { | |
1242 | } | |
1243 | ||
2412e927 | 1244 | static const struct svc_xprt_ops svc_tcp_bc_ops = { |
1f11a034 AA |
1245 | .xpo_create = svc_bc_tcp_create, |
1246 | .xpo_detach = svc_bc_tcp_sock_detach, | |
1247 | .xpo_free = svc_bc_sock_free, | |
1248 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, | |
16e4d93f | 1249 | .xpo_secure_port = svc_sock_secure_port, |
1f11a034 AA |
1250 | }; |
1251 | ||
1252 | static struct svc_xprt_class svc_tcp_bc_class = { | |
1253 | .xcl_name = "tcp-bc", | |
1254 | .xcl_owner = THIS_MODULE, | |
1255 | .xcl_ops = &svc_tcp_bc_ops, | |
1256 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
1257 | }; | |
16b2d1e1 AA |
1258 | |
1259 | static void svc_init_bc_xprt_sock(void) | |
1260 | { | |
1261 | svc_reg_xprt_class(&svc_tcp_bc_class); | |
1262 | } | |
1263 | ||
1264 | static void svc_cleanup_bc_xprt_sock(void) | |
1265 | { | |
1266 | svc_unreg_xprt_class(&svc_tcp_bc_class); | |
1267 | } | |
9e00abc3 | 1268 | #else /* CONFIG_SUNRPC_BACKCHANNEL */ |
16b2d1e1 AA |
1269 | static void svc_init_bc_xprt_sock(void) |
1270 | { | |
1271 | } | |
1272 | ||
1273 | static void svc_cleanup_bc_xprt_sock(void) | |
1274 | { | |
1275 | } | |
9e00abc3 | 1276 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 1277 | |
2412e927 | 1278 | static const struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1279 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1280 | .xpo_recvfrom = svc_tcp_recvfrom, |
1281 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1282 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1283 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1284 | .xpo_free = svc_sock_free, |
e831fe65 | 1285 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1286 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1287 | .xpo_accept = svc_tcp_accept, |
16e4d93f | 1288 | .xpo_secure_port = svc_sock_secure_port, |
ea08e392 | 1289 | .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt, |
360d8738 TT |
1290 | }; |
1291 | ||
1292 | static struct svc_xprt_class svc_tcp_class = { | |
1293 | .xcl_name = "tcp", | |
b700cbb1 | 1294 | .xcl_owner = THIS_MODULE, |
360d8738 | 1295 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1296 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
3c45ddf8 | 1297 | .xcl_ident = XPRT_TRANSPORT_TCP, |
360d8738 TT |
1298 | }; |
1299 | ||
1300 | void svc_init_xprt_sock(void) | |
1301 | { | |
1302 | svc_reg_xprt_class(&svc_tcp_class); | |
1303 | svc_reg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1304 | svc_init_bc_xprt_sock(); |
360d8738 TT |
1305 | } |
1306 | ||
1307 | void svc_cleanup_xprt_sock(void) | |
1308 | { | |
1309 | svc_unreg_xprt_class(&svc_tcp_class); | |
1310 | svc_unreg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1311 | svc_cleanup_bc_xprt_sock(); |
360d8738 TT |
1312 | } |
1313 | ||
bb5cf160 | 1314 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1315 | { |
1316 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1317 | |
bd4620dd SK |
1318 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
1319 | &svsk->sk_xprt, serv); | |
def13d74 | 1320 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
362142b2 | 1321 | set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1322 | if (sk->sk_state == TCP_LISTEN) { |
1323 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1324 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1325 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1326 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1327 | } else { |
1328 | dprintk("setting up TCP socket for reading\n"); | |
1329 | sk->sk_state_change = svc_tcp_state_change; | |
fa9251af | 1330 | sk->sk_data_ready = svc_data_ready; |
637600f3 | 1331 | sk->sk_write_space = svc_write_space; |
1da177e4 LT |
1332 | |
1333 | svsk->sk_reclen = 0; | |
1334 | svsk->sk_tcplen = 0; | |
8af345f5 | 1335 | svsk->sk_datalen = 0; |
31d68ef6 | 1336 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
1da177e4 | 1337 | |
b7872fe8 | 1338 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1339 | |
02fc6c36 | 1340 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
b2f21f7d TM |
1341 | switch (sk->sk_state) { |
1342 | case TCP_SYN_RECV: | |
1343 | case TCP_ESTABLISHED: | |
1344 | break; | |
1345 | default: | |
02fc6c36 | 1346 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
b2f21f7d | 1347 | } |
1da177e4 LT |
1348 | } |
1349 | } | |
1350 | ||
0f0257ea | 1351 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1352 | { |
1353 | /* | |
1354 | * The number of server threads has changed. Update | |
1355 | * rcvbuf and sndbuf accordingly on all sockets | |
1356 | */ | |
8f3a6de3 | 1357 | struct svc_sock *svsk; |
1da177e4 LT |
1358 | |
1359 | spin_lock_bh(&serv->sv_lock); | |
8f3a6de3 | 1360 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
02fc6c36 | 1361 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1362 | spin_unlock_bh(&serv->sv_lock); |
1363 | } | |
24c3767e | 1364 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1365 | |
1da177e4 LT |
1366 | /* |
1367 | * Initialize socket for RPC use and create svc_sock struct | |
1da177e4 | 1368 | */ |
6b174337 CL |
1369 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1370 | struct socket *sock, | |
72c35376 | 1371 | int flags) |
1da177e4 LT |
1372 | { |
1373 | struct svc_sock *svsk; | |
1374 | struct sock *inet; | |
6b174337 | 1375 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
72c35376 | 1376 | int err = 0; |
1da177e4 LT |
1377 | |
1378 | dprintk("svc: svc_setup_socket %p\n", sock); | |
72c35376 BF |
1379 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1380 | if (!svsk) | |
1381 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
1382 | |
1383 | inet = sock->sk; | |
1384 | ||
1385 | /* Register socket with portmapper */ | |
72c35376 BF |
1386 | if (pmap_register) |
1387 | err = svc_register(serv, sock_net(sock->sk), inet->sk_family, | |
5247fab5 | 1388 | inet->sk_protocol, |
c720c7e8 | 1389 | ntohs(inet_sk(inet)->inet_sport)); |
1da177e4 | 1390 | |
72c35376 | 1391 | if (err < 0) { |
1da177e4 | 1392 | kfree(svsk); |
72c35376 | 1393 | return ERR_PTR(err); |
1da177e4 LT |
1394 | } |
1395 | ||
1da177e4 LT |
1396 | svsk->sk_sock = sock; |
1397 | svsk->sk_sk = inet; | |
1398 | svsk->sk_ostate = inet->sk_state_change; | |
1399 | svsk->sk_odata = inet->sk_data_ready; | |
1400 | svsk->sk_owspace = inet->sk_write_space; | |
eebe53e8 VL |
1401 | /* |
1402 | * This barrier is necessary in order to prevent race condition | |
1403 | * with svc_data_ready(), svc_listen_data_ready() and others | |
1404 | * when calling callbacks above. | |
1405 | */ | |
1406 | wmb(); | |
1407 | inet->sk_user_data = svsk; | |
1da177e4 LT |
1408 | |
1409 | /* Initialize the socket */ | |
1410 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1411 | svc_udp_init(svsk, serv); |
637600f3 | 1412 | else |
bb5cf160 | 1413 | svc_tcp_init(svsk, serv); |
1da177e4 | 1414 | |
c7995f8a TM |
1415 | dprintk("svc: svc_setup_socket created %p (inet %p), " |
1416 | "listen %d close %d\n", | |
1417 | svsk, svsk->sk_sk, | |
1418 | test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags), | |
1419 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1da177e4 | 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; | |
1587 | ||
1588 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1589 | ||
1590 | /* put back the old socket callbacks */ | |
069c225b | 1591 | lock_sock(sk); |
755cceab TT |
1592 | sk->sk_state_change = svsk->sk_ostate; |
1593 | sk->sk_data_ready = svsk->sk_odata; | |
1594 | sk->sk_write_space = svsk->sk_owspace; | |
069c225b TM |
1595 | sk->sk_user_data = NULL; |
1596 | release_sock(sk); | |
69b6ba37 TM |
1597 | } |
1598 | ||
1599 | /* | |
1600 | * Disconnect the socket, and reset the callbacks | |
1601 | */ | |
1602 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1603 | { | |
1604 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1605 | ||
1606 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1607 | ||
1608 | svc_sock_detach(xprt); | |
1609 | ||
31d68ef6 BF |
1610 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
1611 | svc_tcp_clear_pages(svsk); | |
69b6ba37 | 1612 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
31d68ef6 | 1613 | } |
755cceab TT |
1614 | } |
1615 | ||
1616 | /* | |
1617 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1618 | */ | |
1619 | static void svc_sock_free(struct svc_xprt *xprt) | |
1620 | { | |
1621 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1622 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1623 | ||
755cceab TT |
1624 | if (svsk->sk_sock->file) |
1625 | sockfd_put(svsk->sk_sock); | |
1626 | else | |
1627 | sock_release(svsk->sk_sock); | |
1628 | kfree(svsk); | |
1629 | } | |
7652e5a0 | 1630 | |
9e00abc3 | 1631 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
7652e5a0 | 1632 | /* |
1f11a034 | 1633 | * Create a back channel svc_xprt which shares the fore channel socket. |
7652e5a0 | 1634 | */ |
1f11a034 AA |
1635 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, |
1636 | int protocol, | |
1637 | struct net *net, | |
1638 | struct sockaddr *sin, int len, | |
1639 | int flags) | |
7652e5a0 BH |
1640 | { |
1641 | struct svc_sock *svsk; | |
1f11a034 AA |
1642 | struct svc_xprt *xprt; |
1643 | ||
1644 | if (protocol != IPPROTO_TCP) { | |
1645 | printk(KERN_WARNING "svc: only TCP sockets" | |
1646 | " supported on shared back channel\n"); | |
1647 | return ERR_PTR(-EINVAL); | |
1648 | } | |
7652e5a0 | 1649 | |
7652e5a0 BH |
1650 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1651 | if (!svsk) | |
1f11a034 | 1652 | return ERR_PTR(-ENOMEM); |
7652e5a0 BH |
1653 | |
1654 | xprt = &svsk->sk_xprt; | |
bd4620dd | 1655 | svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); |
5427290d | 1656 | set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags); |
1f11a034 | 1657 | |
4a19de0f | 1658 | serv->sv_bc_xprt = xprt; |
1f11a034 | 1659 | |
7652e5a0 BH |
1660 | return xprt; |
1661 | } | |
7652e5a0 BH |
1662 | |
1663 | /* | |
1f11a034 | 1664 | * Free a back channel svc_sock. |
7652e5a0 | 1665 | */ |
1f11a034 | 1666 | static void svc_bc_sock_free(struct svc_xprt *xprt) |
7652e5a0 | 1667 | { |
778be232 | 1668 | if (xprt) |
7652e5a0 BH |
1669 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); |
1670 | } | |
9e00abc3 | 1671 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |