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 LT |
23 | #include <linux/sched.h> |
24 | #include <linux/errno.h> | |
25 | #include <linux/fcntl.h> | |
26 | #include <linux/net.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/inet.h> | |
29 | #include <linux/udp.h> | |
91483c4b | 30 | #include <linux/tcp.h> |
1da177e4 LT |
31 | #include <linux/unistd.h> |
32 | #include <linux/slab.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/skbuff.h> | |
b41b66d6 | 35 | #include <linux/file.h> |
7dfb7103 | 36 | #include <linux/freezer.h> |
1da177e4 LT |
37 | #include <net/sock.h> |
38 | #include <net/checksum.h> | |
39 | #include <net/ip.h> | |
b92503b2 | 40 | #include <net/ipv6.h> |
b7872fe8 | 41 | #include <net/tcp.h> |
c752f073 | 42 | #include <net/tcp_states.h> |
1da177e4 LT |
43 | #include <asm/uaccess.h> |
44 | #include <asm/ioctls.h> | |
45 | ||
46 | #include <linux/sunrpc/types.h> | |
ad06e4bd | 47 | #include <linux/sunrpc/clnt.h> |
1da177e4 LT |
48 | #include <linux/sunrpc/xdr.h> |
49 | #include <linux/sunrpc/svcsock.h> | |
50 | #include <linux/sunrpc/stats.h> | |
51 | ||
360d8738 | 52 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 LT |
53 | |
54 | ||
55 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
6b174337 | 56 | int *errp, int flags); |
1da177e4 LT |
57 | static void svc_udp_data_ready(struct sock *, int); |
58 | static int svc_udp_recvfrom(struct svc_rqst *); | |
59 | static int svc_udp_sendto(struct svc_rqst *); | |
755cceab TT |
60 | static void svc_sock_detach(struct svc_xprt *); |
61 | static void svc_sock_free(struct svc_xprt *); | |
1da177e4 | 62 | |
b700cbb1 TT |
63 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
64 | struct sockaddr *, int, int); | |
ed07536e PZ |
65 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
66 | static struct lock_class_key svc_key[2]; | |
67 | static struct lock_class_key svc_slock_key[2]; | |
68 | ||
0f0257ea | 69 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
70 | { |
71 | struct sock *sk = sock->sk; | |
02b3d346 | 72 | BUG_ON(sock_owned_by_user(sk)); |
ed07536e PZ |
73 | switch (sk->sk_family) { |
74 | case AF_INET: | |
75 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
76 | &svc_slock_key[0], |
77 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
78 | &svc_key[0]); | |
ed07536e PZ |
79 | break; |
80 | ||
81 | case AF_INET6: | |
82 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
83 | &svc_slock_key[1], |
84 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
85 | &svc_key[1]); | |
ed07536e PZ |
86 | break; |
87 | ||
88 | default: | |
89 | BUG(); | |
90 | } | |
91 | } | |
92 | #else | |
0f0257ea | 93 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
94 | { |
95 | } | |
96 | #endif | |
97 | ||
1da177e4 LT |
98 | /* |
99 | * Release an skbuff after use | |
100 | */ | |
5148bf4e | 101 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 102 | { |
5148bf4e | 103 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
104 | struct svc_deferred_req *dr = rqstp->rq_deferred; |
105 | ||
106 | if (skb) { | |
57b1d3ba TT |
107 | struct svc_sock *svsk = |
108 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 109 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
110 | |
111 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
57b1d3ba | 112 | skb_free_datagram(svsk->sk_sk, skb); |
1da177e4 LT |
113 | } |
114 | if (dr) { | |
115 | rqstp->rq_deferred = NULL; | |
116 | kfree(dr); | |
117 | } | |
118 | } | |
119 | ||
b92503b2 CL |
120 | union svc_pktinfo_u { |
121 | struct in_pktinfo pkti; | |
b92503b2 | 122 | struct in6_pktinfo pkti6; |
b92503b2 | 123 | }; |
bc375ea7 DM |
124 | #define SVC_PKTINFO_SPACE \ |
125 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
126 | |
127 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
128 | { | |
57b1d3ba TT |
129 | struct svc_sock *svsk = |
130 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
131 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
132 | case AF_INET: { |
133 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
134 | ||
135 | cmh->cmsg_level = SOL_IP; | |
136 | cmh->cmsg_type = IP_PKTINFO; | |
137 | pki->ipi_ifindex = 0; | |
138 | pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr; | |
139 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
140 | } | |
141 | break; | |
5a05ed73 | 142 | |
b92503b2 CL |
143 | case AF_INET6: { |
144 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
145 | ||
146 | cmh->cmsg_level = SOL_IPV6; | |
147 | cmh->cmsg_type = IPV6_PKTINFO; | |
148 | pki->ipi6_ifindex = 0; | |
149 | ipv6_addr_copy(&pki->ipi6_addr, | |
150 | &rqstp->rq_daddr.addr6); | |
151 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
152 | } | |
153 | break; | |
b92503b2 CL |
154 | } |
155 | return; | |
156 | } | |
157 | ||
1da177e4 LT |
158 | /* |
159 | * Generic sendto routine | |
160 | */ | |
0f0257ea | 161 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) |
1da177e4 | 162 | { |
57b1d3ba TT |
163 | struct svc_sock *svsk = |
164 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1da177e4 LT |
165 | struct socket *sock = svsk->sk_sock; |
166 | int slen; | |
bc375ea7 DM |
167 | union { |
168 | struct cmsghdr hdr; | |
169 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
170 | } buffer; | |
171 | struct cmsghdr *cmh = &buffer.hdr; | |
1da177e4 LT |
172 | int len = 0; |
173 | int result; | |
174 | int size; | |
175 | struct page **ppage = xdr->pages; | |
176 | size_t base = xdr->page_base; | |
177 | unsigned int pglen = xdr->page_len; | |
178 | unsigned int flags = MSG_MORE; | |
5216a8e7 | 179 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
180 | |
181 | slen = xdr->len; | |
182 | ||
183 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
b92503b2 CL |
184 | struct msghdr msg = { |
185 | .msg_name = &rqstp->rq_addr, | |
186 | .msg_namelen = rqstp->rq_addrlen, | |
187 | .msg_control = cmh, | |
188 | .msg_controllen = sizeof(buffer), | |
189 | .msg_flags = MSG_MORE, | |
190 | }; | |
191 | ||
192 | svc_set_cmsg_data(rqstp, cmh); | |
1da177e4 LT |
193 | |
194 | if (sock_sendmsg(sock, &msg, 0) < 0) | |
195 | goto out; | |
196 | } | |
197 | ||
198 | /* send head */ | |
199 | if (slen == xdr->head[0].iov_len) | |
200 | flags = 0; | |
44524359 N |
201 | len = kernel_sendpage(sock, rqstp->rq_respages[0], 0, |
202 | xdr->head[0].iov_len, flags); | |
1da177e4 LT |
203 | if (len != xdr->head[0].iov_len) |
204 | goto out; | |
205 | slen -= xdr->head[0].iov_len; | |
206 | if (slen == 0) | |
207 | goto out; | |
208 | ||
209 | /* send page data */ | |
210 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
211 | while (pglen > 0) { | |
212 | if (slen == size) | |
213 | flags = 0; | |
e6242e92 | 214 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
215 | if (result > 0) |
216 | len += result; | |
217 | if (result != size) | |
218 | goto out; | |
219 | slen -= size; | |
220 | pglen -= size; | |
221 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
222 | base = 0; | |
223 | ppage++; | |
224 | } | |
225 | /* send tail */ | |
226 | if (xdr->tail[0].iov_len) { | |
44524359 N |
227 | result = kernel_sendpage(sock, rqstp->rq_respages[0], |
228 | ((unsigned long)xdr->tail[0].iov_base) | |
cca5172a | 229 | & (PAGE_SIZE-1), |
1da177e4 LT |
230 | xdr->tail[0].iov_len, 0); |
231 | ||
232 | if (result > 0) | |
233 | len += result; | |
234 | } | |
235 | out: | |
ad06e4bd | 236 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 237 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 238 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
239 | |
240 | return len; | |
241 | } | |
242 | ||
80212d59 N |
243 | /* |
244 | * Report socket names for nfsdfs | |
245 | */ | |
246 | static int one_sock_name(char *buf, struct svc_sock *svsk) | |
247 | { | |
248 | int len; | |
249 | ||
250 | switch(svsk->sk_sk->sk_family) { | |
251 | case AF_INET: | |
252 | len = sprintf(buf, "ipv4 %s %u.%u.%u.%u %d\n", | |
253 | svsk->sk_sk->sk_protocol==IPPROTO_UDP? | |
254 | "udp" : "tcp", | |
255 | NIPQUAD(inet_sk(svsk->sk_sk)->rcv_saddr), | |
256 | inet_sk(svsk->sk_sk)->num); | |
257 | break; | |
258 | default: | |
259 | len = sprintf(buf, "*unknown-%d*\n", | |
260 | svsk->sk_sk->sk_family); | |
261 | } | |
262 | return len; | |
263 | } | |
264 | ||
265 | int | |
b41b66d6 | 266 | svc_sock_names(char *buf, struct svc_serv *serv, char *toclose) |
80212d59 | 267 | { |
b41b66d6 | 268 | struct svc_sock *svsk, *closesk = NULL; |
80212d59 N |
269 | int len = 0; |
270 | ||
271 | if (!serv) | |
272 | return 0; | |
aaf68cfb | 273 | spin_lock_bh(&serv->sv_lock); |
7a182083 | 274 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) { |
80212d59 | 275 | int onelen = one_sock_name(buf+len, svsk); |
b41b66d6 N |
276 | if (toclose && strcmp(toclose, buf+len) == 0) |
277 | closesk = svsk; | |
278 | else | |
279 | len += onelen; | |
80212d59 | 280 | } |
aaf68cfb | 281 | spin_unlock_bh(&serv->sv_lock); |
b41b66d6 | 282 | if (closesk) |
5680c446 N |
283 | /* Should unregister with portmap, but you cannot |
284 | * unregister just one protocol... | |
285 | */ | |
7a182083 | 286 | svc_close_xprt(&closesk->sk_xprt); |
37a03472 N |
287 | else if (toclose) |
288 | return -ENOENT; | |
80212d59 N |
289 | return len; |
290 | } | |
291 | EXPORT_SYMBOL(svc_sock_names); | |
292 | ||
1da177e4 LT |
293 | /* |
294 | * Check input queue length | |
295 | */ | |
0f0257ea | 296 | static int svc_recv_available(struct svc_sock *svsk) |
1da177e4 | 297 | { |
1da177e4 LT |
298 | struct socket *sock = svsk->sk_sock; |
299 | int avail, err; | |
300 | ||
e6242e92 | 301 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); |
1da177e4 LT |
302 | |
303 | return (err >= 0)? avail : err; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Generic recvfrom routine. | |
308 | */ | |
0f0257ea TT |
309 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
310 | int buflen) | |
1da177e4 | 311 | { |
57b1d3ba TT |
312 | struct svc_sock *svsk = |
313 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1ba95105 CL |
314 | struct msghdr msg = { |
315 | .msg_flags = MSG_DONTWAIT, | |
316 | }; | |
317 | int len; | |
1da177e4 | 318 | |
260c1d12 TT |
319 | rqstp->rq_xprt_hlen = 0; |
320 | ||
1ba95105 CL |
321 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
322 | msg.msg_flags); | |
1da177e4 | 323 | |
1da177e4 | 324 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
1ba95105 | 325 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
326 | return len; |
327 | } | |
328 | ||
329 | /* | |
330 | * Set socket snd and rcv buffer lengths | |
331 | */ | |
0f0257ea TT |
332 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
333 | unsigned int rcv) | |
1da177e4 LT |
334 | { |
335 | #if 0 | |
336 | mm_segment_t oldfs; | |
337 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
338 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
339 | (char*)&snd, sizeof(snd)); | |
340 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
341 | (char*)&rcv, sizeof(rcv)); | |
342 | #else | |
343 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
344 | * which isn't acceptable. Until that is made conditional | |
345 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
346 | * DaveM said I could! | |
347 | */ | |
348 | lock_sock(sock->sk); | |
349 | sock->sk->sk_sndbuf = snd * 2; | |
350 | sock->sk->sk_rcvbuf = rcv * 2; | |
351 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK; | |
352 | release_sock(sock->sk); | |
353 | #endif | |
354 | } | |
355 | /* | |
356 | * INET callback when data has been received on the socket. | |
357 | */ | |
0f0257ea | 358 | static void svc_udp_data_ready(struct sock *sk, int count) |
1da177e4 | 359 | { |
939bb7ef | 360 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 361 | |
939bb7ef NB |
362 | if (svsk) { |
363 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", | |
02fc6c36 TT |
364 | svsk, sk, count, |
365 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); | |
366 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
f6150c3c | 367 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 368 | } |
1da177e4 LT |
369 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
370 | wake_up_interruptible(sk->sk_sleep); | |
371 | } | |
372 | ||
373 | /* | |
374 | * INET callback when space is newly available on the socket. | |
375 | */ | |
0f0257ea | 376 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
377 | { |
378 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
379 | ||
380 | if (svsk) { | |
381 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 382 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
f6150c3c | 383 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 LT |
384 | } |
385 | ||
386 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) { | |
939bb7ef | 387 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 LT |
388 | svsk); |
389 | wake_up_interruptible(sk->sk_sleep); | |
390 | } | |
391 | } | |
392 | ||
9dbc240f TT |
393 | /* |
394 | * Copy the UDP datagram's destination address to the rqstp structure. | |
395 | * The 'destination' address in this case is the address to which the | |
396 | * peer sent the datagram, i.e. our local address. For multihomed | |
397 | * hosts, this can change from msg to msg. Note that only the IP | |
398 | * address changes, the port number should remain the same. | |
399 | */ | |
400 | static void svc_udp_get_dest_address(struct svc_rqst *rqstp, | |
401 | struct cmsghdr *cmh) | |
95756482 | 402 | { |
57b1d3ba TT |
403 | struct svc_sock *svsk = |
404 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
405 | switch (svsk->sk_sk->sk_family) { | |
95756482 | 406 | case AF_INET: { |
7a37f578 N |
407 | struct in_pktinfo *pki = CMSG_DATA(cmh); |
408 | rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr; | |
95756482 | 409 | break; |
7a37f578 | 410 | } |
95756482 | 411 | case AF_INET6: { |
7a37f578 N |
412 | struct in6_pktinfo *pki = CMSG_DATA(cmh); |
413 | ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr); | |
95756482 | 414 | break; |
7a37f578 | 415 | } |
95756482 | 416 | } |
95756482 CL |
417 | } |
418 | ||
1da177e4 LT |
419 | /* |
420 | * Receive a datagram from a UDP socket. | |
421 | */ | |
0f0257ea | 422 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 423 | { |
57b1d3ba TT |
424 | struct svc_sock *svsk = |
425 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 426 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 427 | struct sk_buff *skb; |
bc375ea7 DM |
428 | union { |
429 | struct cmsghdr hdr; | |
430 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
431 | } buffer; | |
432 | struct cmsghdr *cmh = &buffer.hdr; | |
1da177e4 | 433 | int err, len; |
7a37f578 N |
434 | struct msghdr msg = { |
435 | .msg_name = svc_addr(rqstp), | |
436 | .msg_control = cmh, | |
437 | .msg_controllen = sizeof(buffer), | |
438 | .msg_flags = MSG_DONTWAIT, | |
439 | }; | |
1da177e4 | 440 | |
02fc6c36 | 441 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
442 | /* udp sockets need large rcvbuf as all pending |
443 | * requests are still in that buffer. sndbuf must | |
444 | * also be large enough that there is enough space | |
3262c816 GB |
445 | * for one reply per thread. We count all threads |
446 | * rather than threads in a particular pool, which | |
447 | * provides an upper bound on the number of threads | |
448 | * which will access the socket. | |
1da177e4 LT |
449 | */ |
450 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
451 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
452 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 453 | |
02fc6c36 | 454 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
455 | skb = NULL; |
456 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
457 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
458 | if (err >= 0) | |
459 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
460 | ||
461 | if (skb == NULL) { | |
462 | if (err != -EAGAIN) { | |
463 | /* possibly an icmp error */ | |
464 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 465 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 466 | } |
a6046f71 | 467 | svc_xprt_received(&svsk->sk_xprt); |
05ed690e | 468 | return -EAGAIN; |
1da177e4 | 469 | } |
9dbc240f TT |
470 | len = svc_addr_len(svc_addr(rqstp)); |
471 | if (len < 0) | |
472 | return len; | |
473 | rqstp->rq_addrlen = len; | |
b7aa0bf7 ED |
474 | if (skb->tstamp.tv64 == 0) { |
475 | skb->tstamp = ktime_get_real(); | |
cca5172a | 476 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
477 | need that much accuracy */ |
478 | } | |
b7aa0bf7 | 479 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 480 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 LT |
481 | |
482 | /* | |
483 | * Maybe more packets - kick another thread ASAP. | |
484 | */ | |
a6046f71 | 485 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
486 | |
487 | len = skb->len - sizeof(struct udphdr); | |
488 | rqstp->rq_arg.len = len; | |
489 | ||
95756482 | 490 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 491 | |
7a37f578 N |
492 | if (cmh->cmsg_level != IPPROTO_IP || |
493 | cmh->cmsg_type != IP_PKTINFO) { | |
494 | if (net_ratelimit()) | |
495 | printk("rpcsvc: received unknown control message:" | |
496 | "%d/%d\n", | |
497 | cmh->cmsg_level, cmh->cmsg_type); | |
498 | skb_free_datagram(svsk->sk_sk, skb); | |
499 | return 0; | |
500 | } | |
501 | svc_udp_get_dest_address(rqstp, cmh); | |
1da177e4 LT |
502 | |
503 | if (skb_is_nonlinear(skb)) { | |
504 | /* we have to copy */ | |
505 | local_bh_disable(); | |
506 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
507 | local_bh_enable(); | |
508 | /* checksum error */ | |
509 | skb_free_datagram(svsk->sk_sk, skb); | |
510 | return 0; | |
511 | } | |
512 | local_bh_enable(); | |
cca5172a | 513 | skb_free_datagram(svsk->sk_sk, skb); |
1da177e4 LT |
514 | } else { |
515 | /* we can use it in-place */ | |
0f0257ea TT |
516 | rqstp->rq_arg.head[0].iov_base = skb->data + |
517 | sizeof(struct udphdr); | |
1da177e4 | 518 | rqstp->rq_arg.head[0].iov_len = len; |
fb286bb2 HX |
519 | if (skb_checksum_complete(skb)) { |
520 | skb_free_datagram(svsk->sk_sk, skb); | |
521 | return 0; | |
1da177e4 | 522 | } |
5148bf4e | 523 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
524 | } |
525 | ||
526 | rqstp->rq_arg.page_base = 0; | |
527 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
528 | rqstp->rq_arg.head[0].iov_len = len; | |
529 | rqstp->rq_arg.page_len = 0; | |
44524359 | 530 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
531 | } else { |
532 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 533 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 534 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 LT |
535 | } |
536 | ||
537 | if (serv->sv_stats) | |
538 | serv->sv_stats->netudpcnt++; | |
539 | ||
540 | return len; | |
541 | } | |
542 | ||
543 | static int | |
544 | svc_udp_sendto(struct svc_rqst *rqstp) | |
545 | { | |
546 | int error; | |
547 | ||
548 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
549 | if (error == -ECONNREFUSED) | |
550 | /* ICMP error on earlier request. */ | |
551 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
552 | ||
553 | return error; | |
554 | } | |
555 | ||
e831fe65 TT |
556 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
557 | { | |
558 | } | |
559 | ||
323bee32 TT |
560 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
561 | { | |
562 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 563 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
564 | unsigned long required; |
565 | ||
566 | /* | |
567 | * Set the SOCK_NOSPACE flag before checking the available | |
568 | * sock space. | |
569 | */ | |
570 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 571 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
572 | if (required*2 > sock_wspace(svsk->sk_sk)) |
573 | return 0; | |
574 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
575 | return 1; | |
576 | } | |
577 | ||
38a417cc TT |
578 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
579 | { | |
580 | BUG(); | |
581 | return NULL; | |
582 | } | |
583 | ||
b700cbb1 TT |
584 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
585 | struct sockaddr *sa, int salen, | |
586 | int flags) | |
587 | { | |
588 | return svc_create_socket(serv, IPPROTO_UDP, sa, salen, flags); | |
589 | } | |
590 | ||
360d8738 | 591 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 592 | .xpo_create = svc_udp_create, |
5d137990 TT |
593 | .xpo_recvfrom = svc_udp_recvfrom, |
594 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 595 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
596 | .xpo_detach = svc_sock_detach, |
597 | .xpo_free = svc_sock_free, | |
e831fe65 | 598 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 599 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 600 | .xpo_accept = svc_udp_accept, |
360d8738 TT |
601 | }; |
602 | ||
603 | static struct svc_xprt_class svc_udp_class = { | |
604 | .xcl_name = "udp", | |
b700cbb1 | 605 | .xcl_owner = THIS_MODULE, |
360d8738 | 606 | .xcl_ops = &svc_udp_ops, |
49023155 | 607 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
360d8738 TT |
608 | }; |
609 | ||
bb5cf160 | 610 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 611 | { |
7a37f578 N |
612 | int one = 1; |
613 | mm_segment_t oldfs; | |
614 | ||
bb5cf160 | 615 | svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv); |
def13d74 | 616 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
617 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
618 | svsk->sk_sk->sk_write_space = svc_write_space; | |
1da177e4 LT |
619 | |
620 | /* initialise setting must have enough space to | |
cca5172a | 621 | * receive and respond to one request. |
1da177e4 LT |
622 | * svc_udp_recvfrom will re-adjust if necessary |
623 | */ | |
624 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
625 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
626 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 627 | |
0f0257ea TT |
628 | /* data might have come in before data_ready set up */ |
629 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 630 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 N |
631 | |
632 | oldfs = get_fs(); | |
633 | set_fs(KERNEL_DS); | |
634 | /* make sure we get destination address info */ | |
635 | svsk->sk_sock->ops->setsockopt(svsk->sk_sock, IPPROTO_IP, IP_PKTINFO, | |
636 | (char __user *)&one, sizeof(one)); | |
637 | set_fs(oldfs); | |
1da177e4 LT |
638 | } |
639 | ||
640 | /* | |
641 | * A data_ready event on a listening socket means there's a connection | |
642 | * pending. Do not use state_change as a substitute for it. | |
643 | */ | |
0f0257ea | 644 | static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) |
1da177e4 | 645 | { |
939bb7ef | 646 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
647 | |
648 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 649 | sk, sk->sk_state); |
1da177e4 | 650 | |
939bb7ef NB |
651 | /* |
652 | * This callback may called twice when a new connection | |
653 | * is established as a child socket inherits everything | |
654 | * from a parent LISTEN socket. | |
655 | * 1) data_ready method of the parent socket will be called | |
656 | * when one of child sockets become ESTABLISHED. | |
657 | * 2) data_ready method of the child socket may be called | |
658 | * when it receives data before the socket is accepted. | |
659 | * In case of 2, we should ignore it silently. | |
660 | */ | |
661 | if (sk->sk_state == TCP_LISTEN) { | |
662 | if (svsk) { | |
02fc6c36 | 663 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 664 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
665 | } else |
666 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 667 | } |
939bb7ef | 668 | |
1da177e4 LT |
669 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
670 | wake_up_interruptible_all(sk->sk_sleep); | |
671 | } | |
672 | ||
673 | /* | |
674 | * A state change on a connected socket means it's dying or dead. | |
675 | */ | |
0f0257ea | 676 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 677 | { |
939bb7ef | 678 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
679 | |
680 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 681 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 682 | |
939bb7ef | 683 | if (!svsk) |
1da177e4 | 684 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 685 | else { |
02fc6c36 | 686 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 687 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 688 | } |
1da177e4 LT |
689 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
690 | wake_up_interruptible_all(sk->sk_sleep); | |
691 | } | |
692 | ||
0f0257ea | 693 | static void svc_tcp_data_ready(struct sock *sk, int count) |
1da177e4 | 694 | { |
939bb7ef | 695 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
696 | |
697 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
698 | sk, sk->sk_user_data); |
699 | if (svsk) { | |
02fc6c36 | 700 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 701 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 702 | } |
1da177e4 LT |
703 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
704 | wake_up_interruptible(sk->sk_sleep); | |
705 | } | |
706 | ||
707 | /* | |
708 | * Accept a TCP connection | |
709 | */ | |
38a417cc | 710 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 711 | { |
38a417cc | 712 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f AM |
713 | struct sockaddr_storage addr; |
714 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 715 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
716 | struct socket *sock = svsk->sk_sock; |
717 | struct socket *newsock; | |
1da177e4 LT |
718 | struct svc_sock *newsvsk; |
719 | int err, slen; | |
5216a8e7 | 720 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
721 | |
722 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
723 | if (!sock) | |
38a417cc | 724 | return NULL; |
1da177e4 | 725 | |
02fc6c36 | 726 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
727 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
728 | if (err < 0) { | |
1da177e4 LT |
729 | if (err == -ENOMEM) |
730 | printk(KERN_WARNING "%s: no more sockets!\n", | |
731 | serv->sv_name); | |
e6242e92 | 732 | else if (err != -EAGAIN && net_ratelimit()) |
1da177e4 LT |
733 | printk(KERN_WARNING "%s: accept failed (err %d)!\n", |
734 | serv->sv_name, -err); | |
38a417cc | 735 | return NULL; |
1da177e4 | 736 | } |
02fc6c36 | 737 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 738 | |
cdd88b9f | 739 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 LT |
740 | if (err < 0) { |
741 | if (net_ratelimit()) | |
742 | printk(KERN_WARNING "%s: peername failed (err %d)!\n", | |
743 | serv->sv_name, -err); | |
744 | goto failed; /* aborted connection or whatever */ | |
745 | } | |
746 | ||
747 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
748 | * hosts here, but when we get encryption, the IP of the host won't |
749 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 750 | */ |
cdd88b9f | 751 | if (!svc_port_is_privileged(sin)) { |
1da177e4 | 752 | dprintk(KERN_WARNING |
ad06e4bd | 753 | "%s: connect from unprivileged port: %s\n", |
cca5172a | 754 | serv->sv_name, |
cdd88b9f | 755 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 756 | } |
ad06e4bd | 757 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 758 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
759 | |
760 | /* make sure that a write doesn't block forever when | |
761 | * low on memory | |
762 | */ | |
763 | newsock->sk->sk_sndtimeo = HZ*30; | |
764 | ||
6b174337 CL |
765 | if (!(newsvsk = svc_setup_socket(serv, newsock, &err, |
766 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)))) | |
1da177e4 | 767 | goto failed; |
9dbc240f | 768 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
769 | err = kernel_getsockname(newsock, sin, &slen); |
770 | if (unlikely(err < 0)) { | |
771 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
772 | slen = offsetof(struct sockaddr, sa_data); | |
773 | } | |
9dbc240f | 774 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 775 | |
f9f3cc4f TT |
776 | if (serv->sv_stats) |
777 | serv->sv_stats->nettcpconn++; | |
778 | ||
779 | return &newsvsk->sk_xprt; | |
780 | ||
781 | failed: | |
782 | sock_release(newsock); | |
783 | return NULL; | |
784 | } | |
785 | ||
1da177e4 LT |
786 | /* |
787 | * Receive data from a TCP socket. | |
788 | */ | |
0f0257ea | 789 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 790 | { |
57b1d3ba TT |
791 | struct svc_sock *svsk = |
792 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 793 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 794 | int len; |
3cc03b16 | 795 | struct kvec *vec; |
1da177e4 LT |
796 | int pnum, vlen; |
797 | ||
798 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
02fc6c36 TT |
799 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), |
800 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
801 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1da177e4 | 802 | |
02fc6c36 | 803 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
804 | /* sndbuf needs to have room for one request |
805 | * per thread, otherwise we can stall even when the | |
806 | * network isn't a bottleneck. | |
3262c816 GB |
807 | * |
808 | * We count all threads rather than threads in a | |
809 | * particular pool, which provides an upper bound | |
810 | * on the number of threads which will access the socket. | |
811 | * | |
1da177e4 | 812 | * rcvbuf just needs to be able to hold a few requests. |
cca5172a | 813 | * Normally they will be removed from the queue |
1da177e4 LT |
814 | * as soon a a complete request arrives. |
815 | */ | |
816 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
817 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
818 | 3 * serv->sv_max_mesg); | |
1da177e4 | 819 | |
02fc6c36 | 820 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
821 | |
822 | /* Receive data. If we haven't got the record length yet, get | |
823 | * the next four bytes. Otherwise try to gobble up as much as | |
824 | * possible up to the complete record length. | |
825 | */ | |
826 | if (svsk->sk_tcplen < 4) { | |
827 | unsigned long want = 4 - svsk->sk_tcplen; | |
828 | struct kvec iov; | |
829 | ||
830 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; | |
831 | iov.iov_len = want; | |
832 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
833 | goto error; | |
834 | svsk->sk_tcplen += len; | |
835 | ||
836 | if (len < want) { | |
837 | dprintk("svc: short recvfrom while reading record length (%d of %lu)\n", | |
cca5172a | 838 | len, want); |
a6046f71 | 839 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
840 | return -EAGAIN; /* record header not complete */ |
841 | } | |
842 | ||
843 | svsk->sk_reclen = ntohl(svsk->sk_reclen); | |
844 | if (!(svsk->sk_reclen & 0x80000000)) { | |
845 | /* FIXME: technically, a record can be fragmented, | |
846 | * and non-terminal fragments will not have the top | |
847 | * bit set in the fragment length header. | |
848 | * But apparently no known nfs clients send fragmented | |
849 | * records. */ | |
34e9a63b N |
850 | if (net_ratelimit()) |
851 | printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx" | |
852 | " (non-terminal)\n", | |
853 | (unsigned long) svsk->sk_reclen); | |
1da177e4 LT |
854 | goto err_delete; |
855 | } | |
856 | svsk->sk_reclen &= 0x7fffffff; | |
857 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); | |
c6b0a9f8 | 858 | if (svsk->sk_reclen > serv->sv_max_mesg) { |
34e9a63b N |
859 | if (net_ratelimit()) |
860 | printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx" | |
861 | " (large)\n", | |
862 | (unsigned long) svsk->sk_reclen); | |
1da177e4 LT |
863 | goto err_delete; |
864 | } | |
865 | } | |
866 | ||
867 | /* Check whether enough data is available */ | |
868 | len = svc_recv_available(svsk); | |
869 | if (len < 0) | |
870 | goto error; | |
871 | ||
872 | if (len < svsk->sk_reclen) { | |
873 | dprintk("svc: incomplete TCP record (%d of %d)\n", | |
874 | len, svsk->sk_reclen); | |
a6046f71 | 875 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
876 | return -EAGAIN; /* record not complete */ |
877 | } | |
878 | len = svsk->sk_reclen; | |
02fc6c36 | 879 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 880 | |
3cc03b16 | 881 | vec = rqstp->rq_vec; |
1da177e4 LT |
882 | vec[0] = rqstp->rq_arg.head[0]; |
883 | vlen = PAGE_SIZE; | |
884 | pnum = 1; | |
885 | while (vlen < len) { | |
44524359 | 886 | vec[pnum].iov_base = page_address(rqstp->rq_pages[pnum]); |
1da177e4 LT |
887 | vec[pnum].iov_len = PAGE_SIZE; |
888 | pnum++; | |
889 | vlen += PAGE_SIZE; | |
890 | } | |
44524359 | 891 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
1da177e4 LT |
892 | |
893 | /* Now receive data */ | |
894 | len = svc_recvfrom(rqstp, vec, pnum, len); | |
895 | if (len < 0) | |
896 | goto error; | |
897 | ||
898 | dprintk("svc: TCP complete record (%d bytes)\n", len); | |
899 | rqstp->rq_arg.len = len; | |
900 | rqstp->rq_arg.page_base = 0; | |
901 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
902 | rqstp->rq_arg.head[0].iov_len = len; | |
903 | rqstp->rq_arg.page_len = 0; | |
904 | } else { | |
905 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
906 | } | |
907 | ||
5148bf4e | 908 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
909 | rqstp->rq_prot = IPPROTO_TCP; |
910 | ||
911 | /* Reset TCP read info */ | |
912 | svsk->sk_reclen = 0; | |
913 | svsk->sk_tcplen = 0; | |
914 | ||
9dbc240f | 915 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
a6046f71 | 916 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
917 | if (serv->sv_stats) |
918 | serv->sv_stats->nettcpcnt++; | |
919 | ||
920 | return len; | |
921 | ||
922 | err_delete: | |
02fc6c36 | 923 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
924 | return -EAGAIN; |
925 | ||
926 | error: | |
927 | if (len == -EAGAIN) { | |
928 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); | |
a6046f71 | 929 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
930 | } else { |
931 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", | |
bb5cf160 | 932 | svsk->sk_xprt.xpt_server->sv_name, -len); |
93fbf1a5 | 933 | goto err_delete; |
1da177e4 LT |
934 | } |
935 | ||
936 | return len; | |
937 | } | |
938 | ||
939 | /* | |
940 | * Send out data on TCP socket. | |
941 | */ | |
0f0257ea | 942 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
943 | { |
944 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
945 | int sent; | |
d8ed029d | 946 | __be32 reclen; |
1da177e4 LT |
947 | |
948 | /* Set up the first element of the reply kvec. | |
949 | * Any other kvecs that may be in use have been taken | |
950 | * care of by the server implementation itself. | |
951 | */ | |
952 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
953 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
954 | ||
57b1d3ba | 955 | if (test_bit(XPT_DEAD, &rqstp->rq_xprt->xpt_flags)) |
1da177e4 LT |
956 | return -ENOTCONN; |
957 | ||
958 | sent = svc_sendto(rqstp, &rqstp->rq_res); | |
959 | if (sent != xbufp->len) { | |
0f0257ea TT |
960 | printk(KERN_NOTICE |
961 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
962 | "- shutting down socket\n", | |
57b1d3ba | 963 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
964 | (sent<0)?"got error":"sent only", |
965 | sent, xbufp->len); | |
57b1d3ba | 966 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 967 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
968 | sent = -EAGAIN; |
969 | } | |
970 | return sent; | |
971 | } | |
972 | ||
e831fe65 TT |
973 | /* |
974 | * Setup response header. TCP has a 4B record length field. | |
975 | */ | |
976 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
977 | { | |
978 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
979 | ||
980 | /* tcp needs a space for the record length... */ | |
981 | svc_putnl(resv, 0); | |
982 | } | |
983 | ||
323bee32 TT |
984 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
985 | { | |
57b1d3ba | 986 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
bb5cf160 | 987 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
323bee32 TT |
988 | int required; |
989 | int wspace; | |
990 | ||
991 | /* | |
992 | * Set the SOCK_NOSPACE flag before checking the available | |
993 | * sock space. | |
994 | */ | |
995 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 996 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
997 | wspace = sk_stream_wspace(svsk->sk_sk); |
998 | ||
999 | if (wspace < sk_stream_min_wspace(svsk->sk_sk)) | |
1000 | return 0; | |
1001 | if (required * 2 > wspace) | |
1002 | return 0; | |
1003 | ||
1004 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
1005 | return 1; | |
1006 | } | |
1007 | ||
b700cbb1 TT |
1008 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
1009 | struct sockaddr *sa, int salen, | |
1010 | int flags) | |
1011 | { | |
1012 | return svc_create_socket(serv, IPPROTO_TCP, sa, salen, flags); | |
1013 | } | |
1014 | ||
360d8738 | 1015 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1016 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1017 | .xpo_recvfrom = svc_tcp_recvfrom, |
1018 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1019 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
1020 | .xpo_detach = svc_sock_detach, |
1021 | .xpo_free = svc_sock_free, | |
e831fe65 | 1022 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1023 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1024 | .xpo_accept = svc_tcp_accept, |
360d8738 TT |
1025 | }; |
1026 | ||
1027 | static struct svc_xprt_class svc_tcp_class = { | |
1028 | .xcl_name = "tcp", | |
b700cbb1 | 1029 | .xcl_owner = THIS_MODULE, |
360d8738 | 1030 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1031 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
360d8738 TT |
1032 | }; |
1033 | ||
1034 | void svc_init_xprt_sock(void) | |
1035 | { | |
1036 | svc_reg_xprt_class(&svc_tcp_class); | |
1037 | svc_reg_xprt_class(&svc_udp_class); | |
1038 | } | |
1039 | ||
1040 | void svc_cleanup_xprt_sock(void) | |
1041 | { | |
1042 | svc_unreg_xprt_class(&svc_tcp_class); | |
1043 | svc_unreg_xprt_class(&svc_udp_class); | |
1044 | } | |
1045 | ||
bb5cf160 | 1046 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1047 | { |
1048 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1049 | |
bb5cf160 | 1050 | svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv); |
def13d74 | 1051 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1052 | if (sk->sk_state == TCP_LISTEN) { |
1053 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1054 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1055 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1056 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1057 | } else { |
1058 | dprintk("setting up TCP socket for reading\n"); | |
1059 | sk->sk_state_change = svc_tcp_state_change; | |
1060 | sk->sk_data_ready = svc_tcp_data_ready; | |
1061 | sk->sk_write_space = svc_write_space; | |
1062 | ||
1063 | svsk->sk_reclen = 0; | |
1064 | svsk->sk_tcplen = 0; | |
1065 | ||
b7872fe8 | 1066 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 LT |
1067 | |
1068 | /* initialise setting must have enough space to | |
cca5172a | 1069 | * receive and respond to one request. |
1da177e4 LT |
1070 | * svc_tcp_recvfrom will re-adjust if necessary |
1071 | */ | |
1072 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
1073 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
1074 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 1075 | |
02fc6c36 TT |
1076 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1077 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
cca5172a | 1078 | if (sk->sk_state != TCP_ESTABLISHED) |
02fc6c36 | 1079 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1080 | } |
1081 | } | |
1082 | ||
0f0257ea | 1083 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1084 | { |
1085 | /* | |
1086 | * The number of server threads has changed. Update | |
1087 | * rcvbuf and sndbuf accordingly on all sockets | |
1088 | */ | |
1089 | struct list_head *le; | |
1090 | ||
1091 | spin_lock_bh(&serv->sv_lock); | |
1092 | list_for_each(le, &serv->sv_permsocks) { | |
cca5172a | 1093 | struct svc_sock *svsk = |
7a182083 | 1094 | list_entry(le, struct svc_sock, sk_xprt.xpt_list); |
02fc6c36 | 1095 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1096 | } |
1097 | list_for_each(le, &serv->sv_tempsocks) { | |
1098 | struct svc_sock *svsk = | |
7a182083 | 1099 | list_entry(le, struct svc_sock, sk_xprt.xpt_list); |
02fc6c36 | 1100 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1101 | } |
1102 | spin_unlock_bh(&serv->sv_lock); | |
1103 | } | |
23d42ee2 | 1104 | EXPORT_SYMBOL(svc_sock_update_bufs); |
1da177e4 | 1105 | |
1da177e4 LT |
1106 | /* |
1107 | * Initialize socket for RPC use and create svc_sock struct | |
1108 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1109 | */ | |
6b174337 CL |
1110 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1111 | struct socket *sock, | |
1112 | int *errp, int flags) | |
1da177e4 LT |
1113 | { |
1114 | struct svc_sock *svsk; | |
1115 | struct sock *inet; | |
6b174337 | 1116 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
1da177e4 LT |
1117 | |
1118 | dprintk("svc: svc_setup_socket %p\n", sock); | |
0da974f4 | 1119 | if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) { |
1da177e4 LT |
1120 | *errp = -ENOMEM; |
1121 | return NULL; | |
1122 | } | |
1da177e4 LT |
1123 | |
1124 | inet = sock->sk; | |
1125 | ||
1126 | /* Register socket with portmapper */ | |
1127 | if (*errp >= 0 && pmap_register) | |
1128 | *errp = svc_register(serv, inet->sk_protocol, | |
1129 | ntohs(inet_sk(inet)->sport)); | |
1130 | ||
1131 | if (*errp < 0) { | |
1132 | kfree(svsk); | |
1133 | return NULL; | |
1134 | } | |
1135 | ||
1da177e4 LT |
1136 | inet->sk_user_data = svsk; |
1137 | svsk->sk_sock = sock; | |
1138 | svsk->sk_sk = inet; | |
1139 | svsk->sk_ostate = inet->sk_state_change; | |
1140 | svsk->sk_odata = inet->sk_data_ready; | |
1141 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1142 | |
1143 | /* Initialize the socket */ | |
1144 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1145 | svc_udp_init(svsk, serv); |
1da177e4 | 1146 | else |
bb5cf160 | 1147 | svc_tcp_init(svsk, serv); |
1da177e4 | 1148 | |
1da177e4 LT |
1149 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
1150 | svsk, svsk->sk_sk); | |
1151 | ||
1da177e4 LT |
1152 | return svsk; |
1153 | } | |
1154 | ||
b41b66d6 N |
1155 | int svc_addsock(struct svc_serv *serv, |
1156 | int fd, | |
1157 | char *name_return, | |
1158 | int *proto) | |
1159 | { | |
1160 | int err = 0; | |
1161 | struct socket *so = sockfd_lookup(fd, &err); | |
1162 | struct svc_sock *svsk = NULL; | |
1163 | ||
1164 | if (!so) | |
1165 | return err; | |
1166 | if (so->sk->sk_family != AF_INET) | |
1167 | err = -EAFNOSUPPORT; | |
1168 | else if (so->sk->sk_protocol != IPPROTO_TCP && | |
1169 | so->sk->sk_protocol != IPPROTO_UDP) | |
1170 | err = -EPROTONOSUPPORT; | |
1171 | else if (so->state > SS_UNCONNECTED) | |
1172 | err = -EISCONN; | |
1173 | else { | |
6b174337 | 1174 | svsk = svc_setup_socket(serv, so, &err, SVC_SOCK_DEFAULTS); |
e79eff1f | 1175 | if (svsk) { |
9dbc240f TT |
1176 | struct sockaddr_storage addr; |
1177 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1178 | int salen; | |
1179 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) | |
1180 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
4e5caaa5 TT |
1181 | clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags); |
1182 | spin_lock_bh(&serv->sv_lock); | |
1183 | list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks); | |
1184 | spin_unlock_bh(&serv->sv_lock); | |
a6046f71 | 1185 | svc_xprt_received(&svsk->sk_xprt); |
b41b66d6 | 1186 | err = 0; |
e79eff1f | 1187 | } |
b41b66d6 N |
1188 | } |
1189 | if (err) { | |
1190 | sockfd_put(so); | |
1191 | return err; | |
1192 | } | |
1193 | if (proto) *proto = so->sk->sk_protocol; | |
1194 | return one_sock_name(name_return, svsk); | |
1195 | } | |
1196 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1197 | ||
1da177e4 LT |
1198 | /* |
1199 | * Create socket for RPC service. | |
1200 | */ | |
b700cbb1 TT |
1201 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1202 | int protocol, | |
1203 | struct sockaddr *sin, int len, | |
1204 | int flags) | |
1da177e4 LT |
1205 | { |
1206 | struct svc_sock *svsk; | |
1207 | struct socket *sock; | |
1208 | int error; | |
1209 | int type; | |
9dbc240f TT |
1210 | struct sockaddr_storage addr; |
1211 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1212 | int newlen; | |
5216a8e7 | 1213 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 1214 | |
ad06e4bd CL |
1215 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1216 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1217 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1218 | |
1219 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1220 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1221 | "sockets supported\n"); | |
b700cbb1 | 1222 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
1223 | } |
1224 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; | |
1225 | ||
77f1f67a CL |
1226 | error = sock_create_kern(sin->sa_family, type, protocol, &sock); |
1227 | if (error < 0) | |
b700cbb1 | 1228 | return ERR_PTR(error); |
1da177e4 | 1229 | |
ed07536e PZ |
1230 | svc_reclassify_socket(sock); |
1231 | ||
18114746 | 1232 | if (type == SOCK_STREAM) |
77f1f67a CL |
1233 | sock->sk->sk_reuse = 1; /* allow address reuse */ |
1234 | error = kernel_bind(sock, sin, len); | |
18114746 ES |
1235 | if (error < 0) |
1236 | goto bummer; | |
1da177e4 | 1237 | |
9dbc240f TT |
1238 | newlen = len; |
1239 | error = kernel_getsockname(sock, newsin, &newlen); | |
1240 | if (error < 0) | |
1241 | goto bummer; | |
1242 | ||
1da177e4 | 1243 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1244 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1245 | goto bummer; |
1246 | } | |
1247 | ||
e79eff1f | 1248 | if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) { |
9dbc240f | 1249 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
b700cbb1 | 1250 | return (struct svc_xprt *)svsk; |
e79eff1f | 1251 | } |
1da177e4 LT |
1252 | |
1253 | bummer: | |
1254 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1255 | sock_release(sock); | |
b700cbb1 | 1256 | return ERR_PTR(error); |
1da177e4 LT |
1257 | } |
1258 | ||
755cceab TT |
1259 | /* |
1260 | * Detach the svc_sock from the socket so that no | |
1261 | * more callbacks occur. | |
1262 | */ | |
1263 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1264 | { | |
1265 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1266 | struct sock *sk = svsk->sk_sk; | |
1267 | ||
1268 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1269 | ||
1270 | /* put back the old socket callbacks */ | |
1271 | sk->sk_state_change = svsk->sk_ostate; | |
1272 | sk->sk_data_ready = svsk->sk_odata; | |
1273 | sk->sk_write_space = svsk->sk_owspace; | |
1274 | } | |
1275 | ||
1276 | /* | |
1277 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1278 | */ | |
1279 | static void svc_sock_free(struct svc_xprt *xprt) | |
1280 | { | |
1281 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1282 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1283 | ||
755cceab TT |
1284 | if (svsk->sk_sock->file) |
1285 | sockfd_put(svsk->sk_sock); | |
1286 | else | |
1287 | sock_release(svsk->sk_sock); | |
1288 | kfree(svsk); | |
1289 | } |