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> | |
46 | ||
47 | #include <linux/sunrpc/types.h> | |
ad06e4bd | 48 | #include <linux/sunrpc/clnt.h> |
1da177e4 | 49 | #include <linux/sunrpc/xdr.h> |
c0401ea0 | 50 | #include <linux/sunrpc/msg_prot.h> |
1da177e4 LT |
51 | #include <linux/sunrpc/svcsock.h> |
52 | #include <linux/sunrpc/stats.h> | |
4cfc7e60 | 53 | #include <linux/sunrpc/xprt.h> |
1da177e4 | 54 | |
177e4f99 HS |
55 | #include "sunrpc.h" |
56 | ||
360d8738 | 57 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 LT |
58 | |
59 | ||
60 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
6b174337 | 61 | int *errp, int flags); |
1da177e4 LT |
62 | static void svc_udp_data_ready(struct sock *, int); |
63 | static int svc_udp_recvfrom(struct svc_rqst *); | |
64 | static int svc_udp_sendto(struct svc_rqst *); | |
755cceab | 65 | static void svc_sock_detach(struct svc_xprt *); |
69b6ba37 | 66 | static void svc_tcp_sock_detach(struct svc_xprt *); |
755cceab | 67 | static void svc_sock_free(struct svc_xprt *); |
1da177e4 | 68 | |
b700cbb1 | 69 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
62832c03 PE |
70 | struct net *, struct sockaddr *, |
71 | int, int); | |
9e00abc3 | 72 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
73 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
74 | struct net *, struct sockaddr *, | |
75 | int, int); | |
76 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
9e00abc3 | 77 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 78 | |
ed07536e PZ |
79 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
80 | static struct lock_class_key svc_key[2]; | |
81 | static struct lock_class_key svc_slock_key[2]; | |
82 | ||
0f0257ea | 83 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
84 | { |
85 | struct sock *sk = sock->sk; | |
02b3d346 | 86 | BUG_ON(sock_owned_by_user(sk)); |
ed07536e PZ |
87 | switch (sk->sk_family) { |
88 | case AF_INET: | |
89 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
90 | &svc_slock_key[0], |
91 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
92 | &svc_key[0]); | |
ed07536e PZ |
93 | break; |
94 | ||
95 | case AF_INET6: | |
96 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
97 | &svc_slock_key[1], |
98 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
99 | &svc_key[1]); | |
ed07536e PZ |
100 | break; |
101 | ||
102 | default: | |
103 | BUG(); | |
104 | } | |
105 | } | |
106 | #else | |
0f0257ea | 107 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
108 | { |
109 | } | |
110 | #endif | |
111 | ||
1da177e4 LT |
112 | /* |
113 | * Release an skbuff after use | |
114 | */ | |
5148bf4e | 115 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 116 | { |
5148bf4e | 117 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
118 | |
119 | if (skb) { | |
57b1d3ba TT |
120 | struct svc_sock *svsk = |
121 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 122 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
123 | |
124 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
9d410c79 | 125 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 | 126 | } |
1da177e4 LT |
127 | } |
128 | ||
b92503b2 CL |
129 | union svc_pktinfo_u { |
130 | struct in_pktinfo pkti; | |
b92503b2 | 131 | struct in6_pktinfo pkti6; |
b92503b2 | 132 | }; |
bc375ea7 DM |
133 | #define SVC_PKTINFO_SPACE \ |
134 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
135 | |
136 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
137 | { | |
57b1d3ba TT |
138 | struct svc_sock *svsk = |
139 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
140 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
141 | case AF_INET: { |
142 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
143 | ||
144 | cmh->cmsg_level = SOL_IP; | |
145 | cmh->cmsg_type = IP_PKTINFO; | |
146 | pki->ipi_ifindex = 0; | |
849a1cf1 MJ |
147 | pki->ipi_spec_dst.s_addr = |
148 | svc_daddr_in(rqstp)->sin_addr.s_addr; | |
b92503b2 CL |
149 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
150 | } | |
151 | break; | |
5a05ed73 | 152 | |
b92503b2 CL |
153 | case AF_INET6: { |
154 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 | 155 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
b92503b2 CL |
156 | |
157 | cmh->cmsg_level = SOL_IPV6; | |
158 | cmh->cmsg_type = IPV6_PKTINFO; | |
849a1cf1 | 159 | pki->ipi6_ifindex = daddr->sin6_scope_id; |
4e3fd7a0 | 160 | pki->ipi6_addr = daddr->sin6_addr; |
b92503b2 CL |
161 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
162 | } | |
163 | break; | |
b92503b2 | 164 | } |
b92503b2 CL |
165 | } |
166 | ||
1da177e4 | 167 | /* |
4cfc7e60 | 168 | * send routine intended to be shared by the fore- and back-channel |
1da177e4 | 169 | */ |
4cfc7e60 RI |
170 | int svc_send_common(struct socket *sock, struct xdr_buf *xdr, |
171 | struct page *headpage, unsigned long headoffset, | |
172 | struct page *tailpage, unsigned long tailoffset) | |
1da177e4 | 173 | { |
1da177e4 LT |
174 | int result; |
175 | int size; | |
176 | struct page **ppage = xdr->pages; | |
177 | size_t base = xdr->page_base; | |
178 | unsigned int pglen = xdr->page_len; | |
179 | unsigned int flags = MSG_MORE; | |
4cfc7e60 RI |
180 | int slen; |
181 | int len = 0; | |
1da177e4 LT |
182 | |
183 | slen = xdr->len; | |
184 | ||
1da177e4 LT |
185 | /* send head */ |
186 | if (slen == xdr->head[0].iov_len) | |
187 | flags = 0; | |
4cfc7e60 | 188 | len = kernel_sendpage(sock, headpage, headoffset, |
44524359 | 189 | xdr->head[0].iov_len, flags); |
1da177e4 LT |
190 | if (len != xdr->head[0].iov_len) |
191 | goto out; | |
192 | slen -= xdr->head[0].iov_len; | |
193 | if (slen == 0) | |
194 | goto out; | |
195 | ||
196 | /* send page data */ | |
197 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
198 | while (pglen > 0) { | |
199 | if (slen == size) | |
200 | flags = 0; | |
e6242e92 | 201 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
202 | if (result > 0) |
203 | len += result; | |
204 | if (result != size) | |
205 | goto out; | |
206 | slen -= size; | |
207 | pglen -= size; | |
208 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
209 | base = 0; | |
210 | ppage++; | |
211 | } | |
4cfc7e60 | 212 | |
1da177e4 LT |
213 | /* send tail */ |
214 | if (xdr->tail[0].iov_len) { | |
4cfc7e60 RI |
215 | result = kernel_sendpage(sock, tailpage, tailoffset, |
216 | xdr->tail[0].iov_len, 0); | |
1da177e4 LT |
217 | if (result > 0) |
218 | len += result; | |
219 | } | |
4cfc7e60 RI |
220 | |
221 | out: | |
222 | return len; | |
223 | } | |
224 | ||
225 | ||
226 | /* | |
227 | * Generic sendto routine | |
228 | */ | |
229 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
230 | { | |
231 | struct svc_sock *svsk = | |
232 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
233 | struct socket *sock = svsk->sk_sock; | |
234 | union { | |
235 | struct cmsghdr hdr; | |
236 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
237 | } buffer; | |
238 | struct cmsghdr *cmh = &buffer.hdr; | |
239 | int len = 0; | |
240 | unsigned long tailoff; | |
241 | unsigned long headoff; | |
242 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); | |
243 | ||
244 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
245 | struct msghdr msg = { | |
246 | .msg_name = &rqstp->rq_addr, | |
247 | .msg_namelen = rqstp->rq_addrlen, | |
248 | .msg_control = cmh, | |
249 | .msg_controllen = sizeof(buffer), | |
250 | .msg_flags = MSG_MORE, | |
251 | }; | |
252 | ||
253 | svc_set_cmsg_data(rqstp, cmh); | |
254 | ||
255 | if (sock_sendmsg(sock, &msg, 0) < 0) | |
256 | goto out; | |
257 | } | |
258 | ||
259 | tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); | |
260 | headoff = 0; | |
261 | len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, | |
262 | rqstp->rq_respages[0], tailoff); | |
263 | ||
1da177e4 | 264 | out: |
ad06e4bd | 265 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 266 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 267 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
268 | |
269 | return len; | |
270 | } | |
271 | ||
80212d59 N |
272 | /* |
273 | * Report socket names for nfsdfs | |
274 | */ | |
e7942b9f | 275 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
80212d59 | 276 | { |
017cb47f CL |
277 | const struct sock *sk = svsk->sk_sk; |
278 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? | |
279 | "udp" : "tcp"; | |
80212d59 N |
280 | int len; |
281 | ||
017cb47f | 282 | switch (sk->sk_family) { |
e7942b9f CL |
283 | case PF_INET: |
284 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", | |
017cb47f | 285 | proto_name, |
c720c7e8 ED |
286 | &inet_sk(sk)->inet_rcv_saddr, |
287 | inet_sk(sk)->inet_num); | |
80212d59 | 288 | break; |
58de2f86 CL |
289 | case PF_INET6: |
290 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", | |
017cb47f CL |
291 | proto_name, |
292 | &inet6_sk(sk)->rcv_saddr, | |
c720c7e8 | 293 | inet_sk(sk)->inet_num); |
80212d59 N |
294 | break; |
295 | default: | |
e7942b9f | 296 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
017cb47f | 297 | sk->sk_family); |
80212d59 | 298 | } |
e7942b9f CL |
299 | |
300 | if (len >= remaining) { | |
301 | *buf = '\0'; | |
302 | return -ENAMETOOLONG; | |
80212d59 N |
303 | } |
304 | return len; | |
305 | } | |
306 | ||
8435d34d CL |
307 | /** |
308 | * svc_sock_names - construct a list of listener names in a string | |
309 | * @serv: pointer to RPC service | |
310 | * @buf: pointer to a buffer to fill in with socket names | |
311 | * @buflen: size of the buffer to be filled | |
312 | * @toclose: pointer to '\0'-terminated C string containing the name | |
313 | * of a listener to be closed | |
314 | * | |
315 | * Fills in @buf with a '\n'-separated list of names of listener | |
316 | * sockets. If @toclose is not NULL, the socket named by @toclose | |
317 | * is closed, and is not included in the output list. | |
318 | * | |
319 | * Returns positive length of the socket name string, or a negative | |
320 | * errno value on error. | |
321 | */ | |
322 | int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen, | |
323 | const char *toclose) | |
80212d59 | 324 | { |
b41b66d6 | 325 | struct svc_sock *svsk, *closesk = NULL; |
80212d59 N |
326 | int len = 0; |
327 | ||
328 | if (!serv) | |
329 | return 0; | |
e7942b9f | 330 | |
aaf68cfb | 331 | spin_lock_bh(&serv->sv_lock); |
7a182083 | 332 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) { |
e7942b9f CL |
333 | int onelen = svc_one_sock_name(svsk, buf + len, buflen - len); |
334 | if (onelen < 0) { | |
335 | len = onelen; | |
336 | break; | |
337 | } | |
3942302e | 338 | if (toclose && strcmp(toclose, buf + len) == 0) { |
b41b66d6 | 339 | closesk = svsk; |
3942302e N |
340 | svc_xprt_get(&closesk->sk_xprt); |
341 | } else | |
b41b66d6 | 342 | len += onelen; |
80212d59 | 343 | } |
aaf68cfb | 344 | spin_unlock_bh(&serv->sv_lock); |
e7942b9f | 345 | |
3942302e | 346 | if (closesk) { |
5680c446 N |
347 | /* Should unregister with portmap, but you cannot |
348 | * unregister just one protocol... | |
349 | */ | |
7a182083 | 350 | svc_close_xprt(&closesk->sk_xprt); |
3942302e N |
351 | svc_xprt_put(&closesk->sk_xprt); |
352 | } else if (toclose) | |
37a03472 | 353 | return -ENOENT; |
80212d59 N |
354 | return len; |
355 | } | |
24c3767e | 356 | EXPORT_SYMBOL_GPL(svc_sock_names); |
80212d59 | 357 | |
1da177e4 LT |
358 | /* |
359 | * Check input queue length | |
360 | */ | |
0f0257ea | 361 | static int svc_recv_available(struct svc_sock *svsk) |
1da177e4 | 362 | { |
1da177e4 LT |
363 | struct socket *sock = svsk->sk_sock; |
364 | int avail, err; | |
365 | ||
e6242e92 | 366 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); |
1da177e4 LT |
367 | |
368 | return (err >= 0)? avail : err; | |
369 | } | |
370 | ||
371 | /* | |
372 | * Generic recvfrom routine. | |
373 | */ | |
0f0257ea TT |
374 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
375 | int buflen) | |
1da177e4 | 376 | { |
57b1d3ba TT |
377 | struct svc_sock *svsk = |
378 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1ba95105 CL |
379 | struct msghdr msg = { |
380 | .msg_flags = MSG_DONTWAIT, | |
381 | }; | |
382 | int len; | |
1da177e4 | 383 | |
260c1d12 TT |
384 | rqstp->rq_xprt_hlen = 0; |
385 | ||
1ba95105 CL |
386 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
387 | msg.msg_flags); | |
1da177e4 | 388 | |
1da177e4 | 389 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
1ba95105 | 390 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
391 | return len; |
392 | } | |
393 | ||
31d68ef6 BF |
394 | static int svc_partial_recvfrom(struct svc_rqst *rqstp, |
395 | struct kvec *iov, int nr, | |
396 | int buflen, unsigned int base) | |
397 | { | |
398 | size_t save_iovlen; | |
09acfea5 | 399 | void *save_iovbase; |
31d68ef6 BF |
400 | unsigned int i; |
401 | int ret; | |
402 | ||
403 | if (base == 0) | |
404 | return svc_recvfrom(rqstp, iov, nr, buflen); | |
405 | ||
406 | for (i = 0; i < nr; i++) { | |
407 | if (iov[i].iov_len > base) | |
408 | break; | |
409 | base -= iov[i].iov_len; | |
410 | } | |
411 | save_iovlen = iov[i].iov_len; | |
412 | save_iovbase = iov[i].iov_base; | |
413 | iov[i].iov_len -= base; | |
414 | iov[i].iov_base += base; | |
415 | ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); | |
416 | iov[i].iov_len = save_iovlen; | |
417 | iov[i].iov_base = save_iovbase; | |
418 | return ret; | |
419 | } | |
420 | ||
1da177e4 LT |
421 | /* |
422 | * Set socket snd and rcv buffer lengths | |
423 | */ | |
0f0257ea TT |
424 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
425 | unsigned int rcv) | |
1da177e4 LT |
426 | { |
427 | #if 0 | |
428 | mm_segment_t oldfs; | |
429 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
430 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
431 | (char*)&snd, sizeof(snd)); | |
432 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
433 | (char*)&rcv, sizeof(rcv)); | |
434 | #else | |
435 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
436 | * which isn't acceptable. Until that is made conditional | |
437 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
438 | * DaveM said I could! | |
439 | */ | |
440 | lock_sock(sock->sk); | |
441 | sock->sk->sk_sndbuf = snd * 2; | |
442 | sock->sk->sk_rcvbuf = rcv * 2; | |
47fcb03f | 443 | sock->sk->sk_write_space(sock->sk); |
1da177e4 LT |
444 | release_sock(sock->sk); |
445 | #endif | |
446 | } | |
447 | /* | |
448 | * INET callback when data has been received on the socket. | |
449 | */ | |
0f0257ea | 450 | static void svc_udp_data_ready(struct sock *sk, int count) |
1da177e4 | 451 | { |
939bb7ef | 452 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 453 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 | 454 | |
939bb7ef NB |
455 | if (svsk) { |
456 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", | |
02fc6c36 TT |
457 | svsk, sk, count, |
458 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); | |
459 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
f6150c3c | 460 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 461 | } |
eaefd110 ED |
462 | if (wq && waitqueue_active(wq)) |
463 | wake_up_interruptible(wq); | |
1da177e4 LT |
464 | } |
465 | ||
466 | /* | |
467 | * INET callback when space is newly available on the socket. | |
468 | */ | |
0f0257ea | 469 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
470 | { |
471 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
eaefd110 | 472 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
473 | |
474 | if (svsk) { | |
475 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 476 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
f6150c3c | 477 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 LT |
478 | } |
479 | ||
eaefd110 | 480 | if (wq && waitqueue_active(wq)) { |
939bb7ef | 481 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 | 482 | svsk); |
eaefd110 | 483 | wake_up_interruptible(wq); |
1da177e4 LT |
484 | } |
485 | } | |
486 | ||
47fcb03f TM |
487 | static void svc_tcp_write_space(struct sock *sk) |
488 | { | |
489 | struct socket *sock = sk->sk_socket; | |
490 | ||
491 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock) | |
492 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
493 | svc_write_space(sk); | |
494 | } | |
495 | ||
7702ce40 CL |
496 | /* |
497 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
498 | */ | |
499 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
500 | struct cmsghdr *cmh) | |
501 | { | |
502 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
503 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
504 | ||
7702ce40 CL |
505 | if (cmh->cmsg_type != IP_PKTINFO) |
506 | return 0; | |
849a1cf1 MJ |
507 | |
508 | daddr->sin_family = AF_INET; | |
509 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; | |
7702ce40 CL |
510 | return 1; |
511 | } | |
512 | ||
513 | /* | |
514 | * See net/ipv6/datagram.c : datagram_recv_ctl | |
515 | */ | |
516 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
517 | struct cmsghdr *cmh) | |
518 | { | |
519 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
520 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
521 | ||
7702ce40 CL |
522 | if (cmh->cmsg_type != IPV6_PKTINFO) |
523 | return 0; | |
849a1cf1 MJ |
524 | |
525 | daddr->sin6_family = AF_INET6; | |
4e3fd7a0 | 526 | daddr->sin6_addr = pki->ipi6_addr; |
849a1cf1 | 527 | daddr->sin6_scope_id = pki->ipi6_ifindex; |
7702ce40 CL |
528 | return 1; |
529 | } | |
530 | ||
9dbc240f TT |
531 | /* |
532 | * Copy the UDP datagram's destination address to the rqstp structure. | |
533 | * The 'destination' address in this case is the address to which the | |
534 | * peer sent the datagram, i.e. our local address. For multihomed | |
535 | * hosts, this can change from msg to msg. Note that only the IP | |
536 | * address changes, the port number should remain the same. | |
537 | */ | |
7702ce40 CL |
538 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
539 | struct cmsghdr *cmh) | |
95756482 | 540 | { |
7702ce40 CL |
541 | switch (cmh->cmsg_level) { |
542 | case SOL_IP: | |
543 | return svc_udp_get_dest_address4(rqstp, cmh); | |
544 | case SOL_IPV6: | |
545 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 546 | } |
7702ce40 CL |
547 | |
548 | return 0; | |
95756482 CL |
549 | } |
550 | ||
1da177e4 LT |
551 | /* |
552 | * Receive a datagram from a UDP socket. | |
553 | */ | |
0f0257ea | 554 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 555 | { |
57b1d3ba TT |
556 | struct svc_sock *svsk = |
557 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 558 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 559 | struct sk_buff *skb; |
bc375ea7 DM |
560 | union { |
561 | struct cmsghdr hdr; | |
562 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
563 | } buffer; | |
564 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
565 | struct msghdr msg = { |
566 | .msg_name = svc_addr(rqstp), | |
567 | .msg_control = cmh, | |
568 | .msg_controllen = sizeof(buffer), | |
569 | .msg_flags = MSG_DONTWAIT, | |
570 | }; | |
abc5c44d CL |
571 | size_t len; |
572 | int err; | |
1da177e4 | 573 | |
02fc6c36 | 574 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
575 | /* udp sockets need large rcvbuf as all pending |
576 | * requests are still in that buffer. sndbuf must | |
577 | * also be large enough that there is enough space | |
3262c816 GB |
578 | * for one reply per thread. We count all threads |
579 | * rather than threads in a particular pool, which | |
580 | * provides an upper bound on the number of threads | |
581 | * which will access the socket. | |
1da177e4 LT |
582 | */ |
583 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
584 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
585 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 586 | |
02fc6c36 | 587 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
588 | skb = NULL; |
589 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
590 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
591 | if (err >= 0) | |
592 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
593 | ||
594 | if (skb == NULL) { | |
595 | if (err != -EAGAIN) { | |
596 | /* possibly an icmp error */ | |
597 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 598 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 599 | } |
05ed690e | 600 | return -EAGAIN; |
1da177e4 | 601 | } |
9dbc240f | 602 | len = svc_addr_len(svc_addr(rqstp)); |
abc5c44d CL |
603 | if (len == 0) |
604 | return -EAFNOSUPPORT; | |
9dbc240f | 605 | rqstp->rq_addrlen = len; |
b7aa0bf7 ED |
606 | if (skb->tstamp.tv64 == 0) { |
607 | skb->tstamp = ktime_get_real(); | |
cca5172a | 608 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
609 | need that much accuracy */ |
610 | } | |
b7aa0bf7 | 611 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 612 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 613 | |
1da177e4 LT |
614 | len = skb->len - sizeof(struct udphdr); |
615 | rqstp->rq_arg.len = len; | |
616 | ||
95756482 | 617 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 618 | |
7702ce40 | 619 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
e87cc472 JP |
620 | net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", |
621 | cmh->cmsg_level, cmh->cmsg_type); | |
9d410c79 | 622 | skb_free_datagram_locked(svsk->sk_sk, skb); |
7a37f578 N |
623 | return 0; |
624 | } | |
849a1cf1 | 625 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
1da177e4 LT |
626 | |
627 | if (skb_is_nonlinear(skb)) { | |
628 | /* we have to copy */ | |
629 | local_bh_disable(); | |
630 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
631 | local_bh_enable(); | |
632 | /* checksum error */ | |
9d410c79 | 633 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
634 | return 0; |
635 | } | |
636 | local_bh_enable(); | |
9d410c79 | 637 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
638 | } else { |
639 | /* we can use it in-place */ | |
0f0257ea TT |
640 | rqstp->rq_arg.head[0].iov_base = skb->data + |
641 | sizeof(struct udphdr); | |
1da177e4 | 642 | rqstp->rq_arg.head[0].iov_len = len; |
fb286bb2 | 643 | if (skb_checksum_complete(skb)) { |
9d410c79 | 644 | skb_free_datagram_locked(svsk->sk_sk, skb); |
fb286bb2 | 645 | return 0; |
1da177e4 | 646 | } |
5148bf4e | 647 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
648 | } |
649 | ||
650 | rqstp->rq_arg.page_base = 0; | |
651 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
652 | rqstp->rq_arg.head[0].iov_len = len; | |
653 | rqstp->rq_arg.page_len = 0; | |
44524359 | 654 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
655 | } else { |
656 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 657 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 658 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 LT |
659 | } |
660 | ||
661 | if (serv->sv_stats) | |
662 | serv->sv_stats->netudpcnt++; | |
663 | ||
664 | return len; | |
665 | } | |
666 | ||
667 | static int | |
668 | svc_udp_sendto(struct svc_rqst *rqstp) | |
669 | { | |
670 | int error; | |
671 | ||
672 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
673 | if (error == -ECONNREFUSED) | |
674 | /* ICMP error on earlier request. */ | |
675 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
676 | ||
677 | return error; | |
678 | } | |
679 | ||
e831fe65 TT |
680 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
681 | { | |
682 | } | |
683 | ||
323bee32 TT |
684 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
685 | { | |
686 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 687 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
688 | unsigned long required; |
689 | ||
690 | /* | |
691 | * Set the SOCK_NOSPACE flag before checking the available | |
692 | * sock space. | |
693 | */ | |
694 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 695 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
696 | if (required*2 > sock_wspace(svsk->sk_sk)) |
697 | return 0; | |
698 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
699 | return 1; | |
700 | } | |
701 | ||
38a417cc TT |
702 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
703 | { | |
704 | BUG(); | |
705 | return NULL; | |
706 | } | |
707 | ||
b700cbb1 | 708 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
62832c03 | 709 | struct net *net, |
b700cbb1 TT |
710 | struct sockaddr *sa, int salen, |
711 | int flags) | |
712 | { | |
62832c03 | 713 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
b700cbb1 TT |
714 | } |
715 | ||
360d8738 | 716 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 717 | .xpo_create = svc_udp_create, |
5d137990 TT |
718 | .xpo_recvfrom = svc_udp_recvfrom, |
719 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 720 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
721 | .xpo_detach = svc_sock_detach, |
722 | .xpo_free = svc_sock_free, | |
e831fe65 | 723 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 724 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 725 | .xpo_accept = svc_udp_accept, |
360d8738 TT |
726 | }; |
727 | ||
728 | static struct svc_xprt_class svc_udp_class = { | |
729 | .xcl_name = "udp", | |
b700cbb1 | 730 | .xcl_owner = THIS_MODULE, |
360d8738 | 731 | .xcl_ops = &svc_udp_ops, |
49023155 | 732 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
360d8738 TT |
733 | }; |
734 | ||
bb5cf160 | 735 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 736 | { |
7702ce40 | 737 | int err, level, optname, one = 1; |
7a37f578 | 738 | |
bd4620dd SK |
739 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
740 | &svsk->sk_xprt, serv); | |
def13d74 | 741 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
742 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
743 | svsk->sk_sk->sk_write_space = svc_write_space; | |
1da177e4 LT |
744 | |
745 | /* initialise setting must have enough space to | |
cca5172a | 746 | * receive and respond to one request. |
1da177e4 LT |
747 | * svc_udp_recvfrom will re-adjust if necessary |
748 | */ | |
749 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
750 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
751 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 752 | |
0f0257ea TT |
753 | /* data might have come in before data_ready set up */ |
754 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 755 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 756 | |
7a37f578 | 757 | /* make sure we get destination address info */ |
7702ce40 CL |
758 | switch (svsk->sk_sk->sk_family) { |
759 | case AF_INET: | |
760 | level = SOL_IP; | |
761 | optname = IP_PKTINFO; | |
762 | break; | |
763 | case AF_INET6: | |
764 | level = SOL_IPV6; | |
765 | optname = IPV6_RECVPKTINFO; | |
766 | break; | |
767 | default: | |
768 | BUG(); | |
769 | } | |
770 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
771 | (char *)&one, sizeof(one)); | |
772 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
1da177e4 LT |
773 | } |
774 | ||
775 | /* | |
776 | * A data_ready event on a listening socket means there's a connection | |
777 | * pending. Do not use state_change as a substitute for it. | |
778 | */ | |
0f0257ea | 779 | static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) |
1da177e4 | 780 | { |
939bb7ef | 781 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 782 | wait_queue_head_t *wq; |
1da177e4 LT |
783 | |
784 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 785 | sk, sk->sk_state); |
1da177e4 | 786 | |
939bb7ef NB |
787 | /* |
788 | * This callback may called twice when a new connection | |
789 | * is established as a child socket inherits everything | |
790 | * from a parent LISTEN socket. | |
791 | * 1) data_ready method of the parent socket will be called | |
792 | * when one of child sockets become ESTABLISHED. | |
793 | * 2) data_ready method of the child socket may be called | |
794 | * when it receives data before the socket is accepted. | |
795 | * In case of 2, we should ignore it silently. | |
796 | */ | |
797 | if (sk->sk_state == TCP_LISTEN) { | |
798 | if (svsk) { | |
02fc6c36 | 799 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 800 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
801 | } else |
802 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 803 | } |
939bb7ef | 804 | |
eaefd110 ED |
805 | wq = sk_sleep(sk); |
806 | if (wq && waitqueue_active(wq)) | |
807 | wake_up_interruptible_all(wq); | |
1da177e4 LT |
808 | } |
809 | ||
810 | /* | |
811 | * A state change on a connected socket means it's dying or dead. | |
812 | */ | |
0f0257ea | 813 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 814 | { |
939bb7ef | 815 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 816 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
817 | |
818 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 819 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 820 | |
939bb7ef | 821 | if (!svsk) |
1da177e4 | 822 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 823 | else { |
02fc6c36 | 824 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 825 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 826 | } |
eaefd110 ED |
827 | if (wq && waitqueue_active(wq)) |
828 | wake_up_interruptible_all(wq); | |
1da177e4 LT |
829 | } |
830 | ||
0f0257ea | 831 | static void svc_tcp_data_ready(struct sock *sk, int count) |
1da177e4 | 832 | { |
939bb7ef | 833 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 834 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
835 | |
836 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
837 | sk, sk->sk_user_data); |
838 | if (svsk) { | |
02fc6c36 | 839 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 840 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 841 | } |
eaefd110 ED |
842 | if (wq && waitqueue_active(wq)) |
843 | wake_up_interruptible(wq); | |
1da177e4 LT |
844 | } |
845 | ||
846 | /* | |
847 | * Accept a TCP connection | |
848 | */ | |
38a417cc | 849 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 850 | { |
38a417cc | 851 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f | 852 | struct sockaddr_storage addr; |
853 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 854 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
855 | struct socket *sock = svsk->sk_sock; |
856 | struct socket *newsock; | |
1da177e4 LT |
857 | struct svc_sock *newsvsk; |
858 | int err, slen; | |
5216a8e7 | 859 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
860 | |
861 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
862 | if (!sock) | |
38a417cc | 863 | return NULL; |
1da177e4 | 864 | |
02fc6c36 | 865 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
866 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
867 | if (err < 0) { | |
1da177e4 LT |
868 | if (err == -ENOMEM) |
869 | printk(KERN_WARNING "%s: no more sockets!\n", | |
870 | serv->sv_name); | |
e87cc472 JP |
871 | else if (err != -EAGAIN) |
872 | net_warn_ratelimited("%s: accept failed (err %d)!\n", | |
873 | serv->sv_name, -err); | |
38a417cc | 874 | return NULL; |
1da177e4 | 875 | } |
02fc6c36 | 876 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 877 | |
cdd88b9f | 878 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 | 879 | if (err < 0) { |
e87cc472 JP |
880 | net_warn_ratelimited("%s: peername failed (err %d)!\n", |
881 | serv->sv_name, -err); | |
1da177e4 LT |
882 | goto failed; /* aborted connection or whatever */ |
883 | } | |
884 | ||
885 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
886 | * hosts here, but when we get encryption, the IP of the host won't |
887 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 888 | */ |
cdd88b9f | 889 | if (!svc_port_is_privileged(sin)) { |
1da177e4 | 890 | dprintk(KERN_WARNING |
ad06e4bd | 891 | "%s: connect from unprivileged port: %s\n", |
cca5172a | 892 | serv->sv_name, |
cdd88b9f | 893 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 894 | } |
ad06e4bd | 895 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 896 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
897 | |
898 | /* make sure that a write doesn't block forever when | |
899 | * low on memory | |
900 | */ | |
901 | newsock->sk->sk_sndtimeo = HZ*30; | |
902 | ||
6b174337 CL |
903 | if (!(newsvsk = svc_setup_socket(serv, newsock, &err, |
904 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)))) | |
1da177e4 | 905 | goto failed; |
9dbc240f | 906 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
907 | err = kernel_getsockname(newsock, sin, &slen); |
908 | if (unlikely(err < 0)) { | |
909 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
910 | slen = offsetof(struct sockaddr, sa_data); | |
911 | } | |
9dbc240f | 912 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 913 | |
f9f3cc4f TT |
914 | if (serv->sv_stats) |
915 | serv->sv_stats->nettcpconn++; | |
916 | ||
917 | return &newsvsk->sk_xprt; | |
918 | ||
919 | failed: | |
920 | sock_release(newsock); | |
921 | return NULL; | |
922 | } | |
923 | ||
31d68ef6 BF |
924 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
925 | { | |
926 | unsigned int i, len, npages; | |
927 | ||
928 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
929 | return 0; | |
930 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
931 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
932 | for (i = 0; i < npages; i++) { | |
933 | if (rqstp->rq_pages[i] != NULL) | |
934 | put_page(rqstp->rq_pages[i]); | |
935 | BUG_ON(svsk->sk_pages[i] == NULL); | |
936 | rqstp->rq_pages[i] = svsk->sk_pages[i]; | |
937 | svsk->sk_pages[i] = NULL; | |
938 | } | |
939 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
940 | return len; | |
941 | } | |
942 | ||
943 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
944 | { | |
945 | unsigned int i, len, npages; | |
946 | ||
947 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
948 | return; | |
949 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
950 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
951 | for (i = 0; i < npages; i++) { | |
952 | svsk->sk_pages[i] = rqstp->rq_pages[i]; | |
953 | rqstp->rq_pages[i] = NULL; | |
954 | } | |
955 | } | |
956 | ||
957 | static void svc_tcp_clear_pages(struct svc_sock *svsk) | |
958 | { | |
959 | unsigned int i, len, npages; | |
960 | ||
961 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
962 | goto out; | |
963 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
964 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
965 | for (i = 0; i < npages; i++) { | |
966 | BUG_ON(svsk->sk_pages[i] == NULL); | |
967 | put_page(svsk->sk_pages[i]); | |
968 | svsk->sk_pages[i] = NULL; | |
969 | } | |
970 | out: | |
971 | svsk->sk_tcplen = 0; | |
972 | } | |
973 | ||
1da177e4 | 974 | /* |
8f55f3c0 AB |
975 | * Receive data. |
976 | * If we haven't gotten the record length yet, get the next four bytes. | |
977 | * Otherwise try to gobble up as much as possible up to the complete | |
978 | * record length. | |
1da177e4 | 979 | */ |
8f55f3c0 | 980 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
1da177e4 | 981 | { |
bb5cf160 | 982 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
5ee78d48 | 983 | unsigned int want; |
8f55f3c0 | 984 | int len; |
1da177e4 | 985 | |
02fc6c36 | 986 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 987 | |
c0401ea0 | 988 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
1da177e4 LT |
989 | struct kvec iov; |
990 | ||
5ee78d48 | 991 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
1da177e4 LT |
992 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
993 | iov.iov_len = want; | |
994 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
995 | goto error; | |
996 | svsk->sk_tcplen += len; | |
997 | ||
998 | if (len < want) { | |
c0401ea0 CL |
999 | dprintk("svc: short recvfrom while reading record " |
1000 | "length (%d of %d)\n", len, want); | |
31d68ef6 | 1001 | return -EAGAIN; |
1da177e4 LT |
1002 | } |
1003 | ||
1004 | svsk->sk_reclen = ntohl(svsk->sk_reclen); | |
c0401ea0 | 1005 | if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) { |
1da177e4 LT |
1006 | /* FIXME: technically, a record can be fragmented, |
1007 | * and non-terminal fragments will not have the top | |
1008 | * bit set in the fragment length header. | |
1009 | * But apparently no known nfs clients send fragmented | |
1010 | * records. */ | |
e87cc472 | 1011 | net_notice_ratelimited("RPC: multiple fragments per record not supported\n"); |
1da177e4 LT |
1012 | goto err_delete; |
1013 | } | |
8f55f3c0 | 1014 | |
c0401ea0 | 1015 | svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK; |
1da177e4 | 1016 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); |
c6b0a9f8 | 1017 | if (svsk->sk_reclen > serv->sv_max_mesg) { |
e87cc472 JP |
1018 | net_notice_ratelimited("RPC: fragment too large: 0x%08lx\n", |
1019 | (unsigned long)svsk->sk_reclen); | |
1da177e4 LT |
1020 | goto err_delete; |
1021 | } | |
1022 | } | |
1023 | ||
cc6c2127 BF |
1024 | if (svsk->sk_reclen < 8) |
1025 | goto err_delete; /* client is nuts. */ | |
1026 | ||
1da177e4 | 1027 | len = svsk->sk_reclen; |
1da177e4 | 1028 | |
8f55f3c0 | 1029 | return len; |
31d68ef6 BF |
1030 | error: |
1031 | dprintk("RPC: TCP recv_record got %d\n", len); | |
8f55f3c0 | 1032 | return len; |
31d68ef6 | 1033 | err_delete: |
8f55f3c0 | 1034 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
8f55f3c0 AB |
1035 | return -EAGAIN; |
1036 | } | |
1037 | ||
586c52cc | 1038 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
4cfc7e60 | 1039 | { |
586c52cc | 1040 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
4cfc7e60 | 1041 | struct rpc_rqst *req = NULL; |
586c52cc TM |
1042 | struct kvec *src, *dst; |
1043 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
48e6555c BF |
1044 | __be32 xid; |
1045 | __be32 calldir; | |
4cfc7e60 | 1046 | |
4cfc7e60 RI |
1047 | xid = *p++; |
1048 | calldir = *p; | |
1049 | ||
586c52cc TM |
1050 | if (bc_xprt) |
1051 | req = xprt_lookup_rqst(bc_xprt, xid); | |
4cfc7e60 | 1052 | |
586c52cc TM |
1053 | if (!req) { |
1054 | printk(KERN_NOTICE | |
1055 | "%s: Got unrecognized reply: " | |
1056 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
1057 | __func__, ntohl(calldir), | |
1058 | bc_xprt, xid); | |
1059 | return -EAGAIN; | |
4cfc7e60 | 1060 | } |
586c52cc TM |
1061 | |
1062 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
1063 | /* | |
1064 | * XXX!: cheating for now! Only copying HEAD. | |
1065 | * But we know this is good enough for now (in fact, for any | |
1066 | * callback reply in the forseeable future). | |
1067 | */ | |
1068 | dst = &req->rq_private_buf.head[0]; | |
1069 | src = &rqstp->rq_arg.head[0]; | |
1070 | if (dst->iov_len < src->iov_len) | |
1071 | return -EAGAIN; /* whatever; just giving up. */ | |
1072 | memcpy(dst->iov_base, src->iov_base, src->iov_len); | |
1073 | xprt_complete_rqst(req->rq_task, svsk->sk_reclen); | |
1074 | rqstp->rq_arg.len = 0; | |
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) | |
1079 | { | |
1080 | int i = 0; | |
1081 | int t = 0; | |
1082 | ||
1083 | while (t < len) { | |
1084 | vec[i].iov_base = page_address(pages[i]); | |
1085 | vec[i].iov_len = PAGE_SIZE; | |
1086 | i++; | |
1087 | t += PAGE_SIZE; | |
1088 | } | |
1089 | return i; | |
4cfc7e60 RI |
1090 | } |
1091 | ||
31d68ef6 | 1092 | |
8f55f3c0 AB |
1093 | /* |
1094 | * Receive data from a TCP socket. | |
1095 | */ | |
1096 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1097 | { | |
1098 | struct svc_sock *svsk = | |
1099 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1100 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1101 | int len; | |
1102 | struct kvec *vec; | |
31d68ef6 | 1103 | unsigned int want, base; |
586c52cc TM |
1104 | __be32 *p; |
1105 | __be32 calldir; | |
5ee78d48 | 1106 | int pnum; |
8f55f3c0 AB |
1107 | |
1108 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1109 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1110 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1111 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1112 | ||
1113 | len = svc_tcp_recv_record(svsk, rqstp); | |
1114 | if (len < 0) | |
1115 | goto error; | |
1116 | ||
31d68ef6 BF |
1117 | base = svc_tcp_restore_pages(svsk, rqstp); |
1118 | want = svsk->sk_reclen - base; | |
1119 | ||
3cc03b16 | 1120 | vec = rqstp->rq_vec; |
4cfc7e60 | 1121 | |
586c52cc TM |
1122 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], |
1123 | svsk->sk_reclen); | |
1124 | ||
44524359 | 1125 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
1da177e4 LT |
1126 | |
1127 | /* Now receive data */ | |
31d68ef6 BF |
1128 | len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); |
1129 | if (len >= 0) | |
1130 | svsk->sk_tcplen += len; | |
1131 | if (len != want) { | |
1132 | if (len < 0 && len != -EAGAIN) | |
1133 | goto err_other; | |
1134 | svc_tcp_save_pages(svsk, rqstp); | |
1135 | dprintk("svc: incomplete TCP record (%d of %d)\n", | |
1136 | svsk->sk_tcplen, svsk->sk_reclen); | |
1137 | goto err_noclose; | |
1138 | } | |
1da177e4 | 1139 | |
5ee78d48 | 1140 | rqstp->rq_arg.len = svsk->sk_reclen; |
1da177e4 | 1141 | rqstp->rq_arg.page_base = 0; |
5ee78d48 TM |
1142 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1143 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1da177e4 | 1144 | rqstp->rq_arg.page_len = 0; |
5ee78d48 TM |
1145 | } else |
1146 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1da177e4 | 1147 | |
5148bf4e | 1148 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
1149 | rqstp->rq_prot = IPPROTO_TCP; |
1150 | ||
586c52cc TM |
1151 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
1152 | calldir = p[1]; | |
8985ef0b | 1153 | if (calldir) |
586c52cc | 1154 | len = receive_cb_reply(svsk, rqstp); |
586c52cc | 1155 | |
1da177e4 LT |
1156 | /* Reset TCP read info */ |
1157 | svsk->sk_reclen = 0; | |
1158 | svsk->sk_tcplen = 0; | |
0601f793 TM |
1159 | /* If we have more data, signal svc_xprt_enqueue() to try again */ |
1160 | if (svc_recv_available(svsk) > sizeof(rpc_fraghdr)) | |
1161 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
1162 | ||
8985ef0b BF |
1163 | if (len < 0) |
1164 | goto error; | |
1da177e4 | 1165 | |
9dbc240f | 1166 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1167 | if (serv->sv_stats) |
1168 | serv->sv_stats->nettcpcnt++; | |
1169 | ||
31d68ef6 | 1170 | dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len); |
5ee78d48 | 1171 | return rqstp->rq_arg.len; |
1da177e4 | 1172 | |
8f55f3c0 | 1173 | error: |
31d68ef6 BF |
1174 | if (len != -EAGAIN) |
1175 | goto err_other; | |
1176 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); | |
8f55f3c0 | 1177 | return -EAGAIN; |
31d68ef6 BF |
1178 | err_other: |
1179 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", | |
1180 | svsk->sk_xprt.xpt_server->sv_name, -len); | |
1181 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1182 | err_noclose: | |
1183 | return -EAGAIN; /* record not complete */ | |
1da177e4 LT |
1184 | } |
1185 | ||
1186 | /* | |
1187 | * Send out data on TCP socket. | |
1188 | */ | |
0f0257ea | 1189 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
1190 | { |
1191 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1192 | int sent; | |
d8ed029d | 1193 | __be32 reclen; |
1da177e4 LT |
1194 | |
1195 | /* Set up the first element of the reply kvec. | |
1196 | * Any other kvecs that may be in use have been taken | |
1197 | * care of by the server implementation itself. | |
1198 | */ | |
1199 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1200 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1201 | ||
1da177e4 LT |
1202 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
1203 | if (sent != xbufp->len) { | |
0f0257ea TT |
1204 | printk(KERN_NOTICE |
1205 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1206 | "- shutting down socket\n", | |
57b1d3ba | 1207 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1208 | (sent<0)?"got error":"sent only", |
1209 | sent, xbufp->len); | |
57b1d3ba | 1210 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1211 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1212 | sent = -EAGAIN; |
1213 | } | |
1214 | return sent; | |
1215 | } | |
1216 | ||
e831fe65 TT |
1217 | /* |
1218 | * Setup response header. TCP has a 4B record length field. | |
1219 | */ | |
1220 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1221 | { | |
1222 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1223 | ||
1224 | /* tcp needs a space for the record length... */ | |
1225 | svc_putnl(resv, 0); | |
1226 | } | |
1227 | ||
323bee32 TT |
1228 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
1229 | { | |
57b1d3ba | 1230 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
47fcb03f | 1231 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
323bee32 | 1232 | int required; |
323bee32 | 1233 | |
47fcb03f TM |
1234 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) |
1235 | return 1; | |
1236 | required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; | |
1237 | if (sk_stream_wspace(svsk->sk_sk) >= required) | |
1238 | return 1; | |
323bee32 | 1239 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
47fcb03f | 1240 | return 0; |
323bee32 TT |
1241 | } |
1242 | ||
b700cbb1 | 1243 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
62832c03 | 1244 | struct net *net, |
b700cbb1 TT |
1245 | struct sockaddr *sa, int salen, |
1246 | int flags) | |
1247 | { | |
62832c03 | 1248 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
b700cbb1 TT |
1249 | } |
1250 | ||
9e00abc3 | 1251 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
1252 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
1253 | struct net *, struct sockaddr *, | |
1254 | int, int); | |
1255 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
1256 | ||
1257 | static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, | |
1258 | struct net *net, | |
1259 | struct sockaddr *sa, int salen, | |
1260 | int flags) | |
1261 | { | |
1262 | return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); | |
1263 | } | |
1264 | ||
1265 | static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) | |
1266 | { | |
1267 | } | |
1268 | ||
1269 | static struct svc_xprt_ops svc_tcp_bc_ops = { | |
1270 | .xpo_create = svc_bc_tcp_create, | |
1271 | .xpo_detach = svc_bc_tcp_sock_detach, | |
1272 | .xpo_free = svc_bc_sock_free, | |
1273 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, | |
1274 | }; | |
1275 | ||
1276 | static struct svc_xprt_class svc_tcp_bc_class = { | |
1277 | .xcl_name = "tcp-bc", | |
1278 | .xcl_owner = THIS_MODULE, | |
1279 | .xcl_ops = &svc_tcp_bc_ops, | |
1280 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
1281 | }; | |
16b2d1e1 AA |
1282 | |
1283 | static void svc_init_bc_xprt_sock(void) | |
1284 | { | |
1285 | svc_reg_xprt_class(&svc_tcp_bc_class); | |
1286 | } | |
1287 | ||
1288 | static void svc_cleanup_bc_xprt_sock(void) | |
1289 | { | |
1290 | svc_unreg_xprt_class(&svc_tcp_bc_class); | |
1291 | } | |
9e00abc3 | 1292 | #else /* CONFIG_SUNRPC_BACKCHANNEL */ |
16b2d1e1 AA |
1293 | static void svc_init_bc_xprt_sock(void) |
1294 | { | |
1295 | } | |
1296 | ||
1297 | static void svc_cleanup_bc_xprt_sock(void) | |
1298 | { | |
1299 | } | |
9e00abc3 | 1300 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 1301 | |
360d8738 | 1302 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1303 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1304 | .xpo_recvfrom = svc_tcp_recvfrom, |
1305 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1306 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1307 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1308 | .xpo_free = svc_sock_free, |
e831fe65 | 1309 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1310 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1311 | .xpo_accept = svc_tcp_accept, |
360d8738 TT |
1312 | }; |
1313 | ||
1314 | static struct svc_xprt_class svc_tcp_class = { | |
1315 | .xcl_name = "tcp", | |
b700cbb1 | 1316 | .xcl_owner = THIS_MODULE, |
360d8738 | 1317 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1318 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
360d8738 TT |
1319 | }; |
1320 | ||
1321 | void svc_init_xprt_sock(void) | |
1322 | { | |
1323 | svc_reg_xprt_class(&svc_tcp_class); | |
1324 | svc_reg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1325 | svc_init_bc_xprt_sock(); |
360d8738 TT |
1326 | } |
1327 | ||
1328 | void svc_cleanup_xprt_sock(void) | |
1329 | { | |
1330 | svc_unreg_xprt_class(&svc_tcp_class); | |
1331 | svc_unreg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1332 | svc_cleanup_bc_xprt_sock(); |
360d8738 TT |
1333 | } |
1334 | ||
bb5cf160 | 1335 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1336 | { |
1337 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1338 | |
bd4620dd SK |
1339 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
1340 | &svsk->sk_xprt, serv); | |
def13d74 | 1341 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1342 | if (sk->sk_state == TCP_LISTEN) { |
1343 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1344 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1345 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1346 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1347 | } else { |
1348 | dprintk("setting up TCP socket for reading\n"); | |
1349 | sk->sk_state_change = svc_tcp_state_change; | |
1350 | sk->sk_data_ready = svc_tcp_data_ready; | |
47fcb03f | 1351 | sk->sk_write_space = svc_tcp_write_space; |
1da177e4 LT |
1352 | |
1353 | svsk->sk_reclen = 0; | |
1354 | svsk->sk_tcplen = 0; | |
31d68ef6 | 1355 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
1da177e4 | 1356 | |
b7872fe8 | 1357 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1358 | |
02fc6c36 | 1359 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
cca5172a | 1360 | if (sk->sk_state != TCP_ESTABLISHED) |
02fc6c36 | 1361 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1362 | } |
1363 | } | |
1364 | ||
0f0257ea | 1365 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1366 | { |
1367 | /* | |
1368 | * The number of server threads has changed. Update | |
1369 | * rcvbuf and sndbuf accordingly on all sockets | |
1370 | */ | |
8f3a6de3 | 1371 | struct svc_sock *svsk; |
1da177e4 LT |
1372 | |
1373 | spin_lock_bh(&serv->sv_lock); | |
8f3a6de3 | 1374 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
02fc6c36 | 1375 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1376 | spin_unlock_bh(&serv->sv_lock); |
1377 | } | |
24c3767e | 1378 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1379 | |
1da177e4 LT |
1380 | /* |
1381 | * Initialize socket for RPC use and create svc_sock struct | |
1382 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1383 | */ | |
6b174337 CL |
1384 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1385 | struct socket *sock, | |
1386 | int *errp, int flags) | |
1da177e4 LT |
1387 | { |
1388 | struct svc_sock *svsk; | |
1389 | struct sock *inet; | |
6b174337 | 1390 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
1da177e4 LT |
1391 | |
1392 | dprintk("svc: svc_setup_socket %p\n", sock); | |
0da974f4 | 1393 | if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) { |
1da177e4 LT |
1394 | *errp = -ENOMEM; |
1395 | return NULL; | |
1396 | } | |
1da177e4 LT |
1397 | |
1398 | inet = sock->sk; | |
1399 | ||
1400 | /* Register socket with portmapper */ | |
1401 | if (*errp >= 0 && pmap_register) | |
d3b773e4 | 1402 | *errp = svc_register(serv, sock_net(sock->sk), inet->sk_family, |
5247fab5 | 1403 | inet->sk_protocol, |
c720c7e8 | 1404 | ntohs(inet_sk(inet)->inet_sport)); |
1da177e4 LT |
1405 | |
1406 | if (*errp < 0) { | |
1407 | kfree(svsk); | |
1408 | return NULL; | |
1409 | } | |
1410 | ||
1da177e4 LT |
1411 | inet->sk_user_data = svsk; |
1412 | svsk->sk_sock = sock; | |
1413 | svsk->sk_sk = inet; | |
1414 | svsk->sk_ostate = inet->sk_state_change; | |
1415 | svsk->sk_odata = inet->sk_data_ready; | |
1416 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1417 | |
1418 | /* Initialize the socket */ | |
1419 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1420 | svc_udp_init(svsk, serv); |
96604398 OK |
1421 | else { |
1422 | /* initialise setting must have enough space to | |
1423 | * receive and respond to one request. | |
1424 | */ | |
1425 | svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, | |
1426 | 4 * serv->sv_max_mesg); | |
bb5cf160 | 1427 | svc_tcp_init(svsk, serv); |
96604398 | 1428 | } |
1da177e4 | 1429 | |
1da177e4 LT |
1430 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
1431 | svsk, svsk->sk_sk); | |
1432 | ||
1da177e4 LT |
1433 | return svsk; |
1434 | } | |
1435 | ||
bfba9ab4 CL |
1436 | /** |
1437 | * svc_addsock - add a listener socket to an RPC service | |
1438 | * @serv: pointer to RPC service to which to add a new listener | |
1439 | * @fd: file descriptor of the new listener | |
1440 | * @name_return: pointer to buffer to fill in with name of listener | |
1441 | * @len: size of the buffer | |
1442 | * | |
1443 | * Fills in socket name and returns positive length of name if successful. | |
1444 | * Name is terminated with '\n'. On error, returns a negative errno | |
1445 | * value. | |
1446 | */ | |
1447 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
1448 | const size_t len) | |
b41b66d6 N |
1449 | { |
1450 | int err = 0; | |
1451 | struct socket *so = sockfd_lookup(fd, &err); | |
1452 | struct svc_sock *svsk = NULL; | |
1453 | ||
1454 | if (!so) | |
1455 | return err; | |
205ba423 | 1456 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
b41b66d6 N |
1457 | err = -EAFNOSUPPORT; |
1458 | else if (so->sk->sk_protocol != IPPROTO_TCP && | |
1459 | so->sk->sk_protocol != IPPROTO_UDP) | |
1460 | err = -EPROTONOSUPPORT; | |
1461 | else if (so->state > SS_UNCONNECTED) | |
1462 | err = -EISCONN; | |
1463 | else { | |
2da2c21d TT |
1464 | if (!try_module_get(THIS_MODULE)) |
1465 | err = -ENOENT; | |
1466 | else | |
1467 | svsk = svc_setup_socket(serv, so, &err, | |
1468 | SVC_SOCK_DEFAULTS); | |
e79eff1f | 1469 | if (svsk) { |
9dbc240f TT |
1470 | struct sockaddr_storage addr; |
1471 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1472 | int salen; | |
1473 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) | |
1474 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
4e5caaa5 TT |
1475 | clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags); |
1476 | spin_lock_bh(&serv->sv_lock); | |
1477 | list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks); | |
1478 | spin_unlock_bh(&serv->sv_lock); | |
a6046f71 | 1479 | svc_xprt_received(&svsk->sk_xprt); |
b41b66d6 | 1480 | err = 0; |
2da2c21d TT |
1481 | } else |
1482 | module_put(THIS_MODULE); | |
b41b66d6 N |
1483 | } |
1484 | if (err) { | |
1485 | sockfd_put(so); | |
1486 | return err; | |
1487 | } | |
e7942b9f | 1488 | return svc_one_sock_name(svsk, name_return, len); |
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 | ||
e79eff1f | 1566 | if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) { |
9dbc240f | 1567 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
b700cbb1 | 1568 | return (struct svc_xprt *)svsk; |
e79eff1f | 1569 | } |
1da177e4 LT |
1570 | |
1571 | bummer: | |
1572 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1573 | sock_release(sock); | |
b700cbb1 | 1574 | return ERR_PTR(error); |
1da177e4 LT |
1575 | } |
1576 | ||
755cceab TT |
1577 | /* |
1578 | * Detach the svc_sock from the socket so that no | |
1579 | * more callbacks occur. | |
1580 | */ | |
1581 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1582 | { | |
1583 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1584 | struct sock *sk = svsk->sk_sk; | |
eaefd110 | 1585 | wait_queue_head_t *wq; |
755cceab TT |
1586 | |
1587 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1588 | ||
1589 | /* put back the old socket callbacks */ | |
1590 | sk->sk_state_change = svsk->sk_ostate; | |
1591 | sk->sk_data_ready = svsk->sk_odata; | |
1592 | sk->sk_write_space = svsk->sk_owspace; | |
69b6ba37 | 1593 | |
eaefd110 ED |
1594 | wq = sk_sleep(sk); |
1595 | if (wq && waitqueue_active(wq)) | |
1596 | wake_up_interruptible(wq); | |
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); |
1f11a034 | 1656 | |
4a19de0f | 1657 | serv->sv_bc_xprt = xprt; |
1f11a034 | 1658 | |
7652e5a0 BH |
1659 | return xprt; |
1660 | } | |
7652e5a0 BH |
1661 | |
1662 | /* | |
1f11a034 | 1663 | * Free a back channel svc_sock. |
7652e5a0 | 1664 | */ |
1f11a034 | 1665 | static void svc_bc_sock_free(struct svc_xprt *xprt) |
7652e5a0 | 1666 | { |
778be232 | 1667 | if (xprt) |
7652e5a0 BH |
1668 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); |
1669 | } | |
9e00abc3 | 1670 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |