| 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 |
| 8 | * svc_xprt_enqueue procedure... |
| 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 | |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/sched.h> |
| 24 | #include <linux/module.h> |
| 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> |
| 31 | #include <linux/tcp.h> |
| 32 | #include <linux/unistd.h> |
| 33 | #include <linux/slab.h> |
| 34 | #include <linux/netdevice.h> |
| 35 | #include <linux/skbuff.h> |
| 36 | #include <linux/file.h> |
| 37 | #include <linux/freezer.h> |
| 38 | #include <net/sock.h> |
| 39 | #include <net/checksum.h> |
| 40 | #include <net/ip.h> |
| 41 | #include <net/ipv6.h> |
| 42 | #include <net/udp.h> |
| 43 | #include <net/tcp.h> |
| 44 | #include <net/tcp_states.h> |
| 45 | #include <linux/uaccess.h> |
| 46 | #include <asm/ioctls.h> |
| 47 | #include <trace/events/skb.h> |
| 48 | |
| 49 | #include <linux/sunrpc/types.h> |
| 50 | #include <linux/sunrpc/clnt.h> |
| 51 | #include <linux/sunrpc/xdr.h> |
| 52 | #include <linux/sunrpc/msg_prot.h> |
| 53 | #include <linux/sunrpc/svcsock.h> |
| 54 | #include <linux/sunrpc/stats.h> |
| 55 | #include <linux/sunrpc/xprt.h> |
| 56 | |
| 57 | #include "sunrpc.h" |
| 58 | |
| 59 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
| 60 | |
| 61 | |
| 62 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, |
| 63 | int flags); |
| 64 | static int svc_udp_recvfrom(struct svc_rqst *); |
| 65 | static int svc_udp_sendto(struct svc_rqst *); |
| 66 | static void svc_sock_detach(struct svc_xprt *); |
| 67 | static void svc_tcp_sock_detach(struct svc_xprt *); |
| 68 | static void svc_sock_free(struct svc_xprt *); |
| 69 | |
| 70 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
| 71 | struct net *, struct sockaddr *, |
| 72 | int, int); |
| 73 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
| 74 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
| 75 | struct net *, struct sockaddr *, |
| 76 | int, int); |
| 77 | static void svc_bc_sock_free(struct svc_xprt *xprt); |
| 78 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
| 79 | |
| 80 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 81 | static struct lock_class_key svc_key[2]; |
| 82 | static struct lock_class_key svc_slock_key[2]; |
| 83 | |
| 84 | static void svc_reclassify_socket(struct socket *sock) |
| 85 | { |
| 86 | struct sock *sk = sock->sk; |
| 87 | |
| 88 | if (WARN_ON_ONCE(!sock_allow_reclassification(sk))) |
| 89 | return; |
| 90 | |
| 91 | switch (sk->sk_family) { |
| 92 | case AF_INET: |
| 93 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", |
| 94 | &svc_slock_key[0], |
| 95 | "sk_xprt.xpt_lock-AF_INET-NFSD", |
| 96 | &svc_key[0]); |
| 97 | break; |
| 98 | |
| 99 | case AF_INET6: |
| 100 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", |
| 101 | &svc_slock_key[1], |
| 102 | "sk_xprt.xpt_lock-AF_INET6-NFSD", |
| 103 | &svc_key[1]); |
| 104 | break; |
| 105 | |
| 106 | default: |
| 107 | BUG(); |
| 108 | } |
| 109 | } |
| 110 | #else |
| 111 | static void svc_reclassify_socket(struct socket *sock) |
| 112 | { |
| 113 | } |
| 114 | #endif |
| 115 | |
| 116 | /* |
| 117 | * Release an skbuff after use |
| 118 | */ |
| 119 | static void svc_release_skb(struct svc_rqst *rqstp) |
| 120 | { |
| 121 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
| 122 | |
| 123 | if (skb) { |
| 124 | struct svc_sock *svsk = |
| 125 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| 126 | rqstp->rq_xprt_ctxt = NULL; |
| 127 | |
| 128 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); |
| 129 | skb_free_datagram_locked(svsk->sk_sk, skb); |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | static void svc_release_udp_skb(struct svc_rqst *rqstp) |
| 134 | { |
| 135 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
| 136 | |
| 137 | if (skb) { |
| 138 | rqstp->rq_xprt_ctxt = NULL; |
| 139 | |
| 140 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); |
| 141 | consume_skb(skb); |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | union svc_pktinfo_u { |
| 146 | struct in_pktinfo pkti; |
| 147 | struct in6_pktinfo pkti6; |
| 148 | }; |
| 149 | #define SVC_PKTINFO_SPACE \ |
| 150 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) |
| 151 | |
| 152 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) |
| 153 | { |
| 154 | struct svc_sock *svsk = |
| 155 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| 156 | switch (svsk->sk_sk->sk_family) { |
| 157 | case AF_INET: { |
| 158 | struct in_pktinfo *pki = CMSG_DATA(cmh); |
| 159 | |
| 160 | cmh->cmsg_level = SOL_IP; |
| 161 | cmh->cmsg_type = IP_PKTINFO; |
| 162 | pki->ipi_ifindex = 0; |
| 163 | pki->ipi_spec_dst.s_addr = |
| 164 | svc_daddr_in(rqstp)->sin_addr.s_addr; |
| 165 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
| 166 | } |
| 167 | break; |
| 168 | |
| 169 | case AF_INET6: { |
| 170 | struct in6_pktinfo *pki = CMSG_DATA(cmh); |
| 171 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
| 172 | |
| 173 | cmh->cmsg_level = SOL_IPV6; |
| 174 | cmh->cmsg_type = IPV6_PKTINFO; |
| 175 | pki->ipi6_ifindex = daddr->sin6_scope_id; |
| 176 | pki->ipi6_addr = daddr->sin6_addr; |
| 177 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
| 178 | } |
| 179 | break; |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * send routine intended to be shared by the fore- and back-channel |
| 185 | */ |
| 186 | int svc_send_common(struct socket *sock, struct xdr_buf *xdr, |
| 187 | struct page *headpage, unsigned long headoffset, |
| 188 | struct page *tailpage, unsigned long tailoffset) |
| 189 | { |
| 190 | int result; |
| 191 | int size; |
| 192 | struct page **ppage = xdr->pages; |
| 193 | size_t base = xdr->page_base; |
| 194 | unsigned int pglen = xdr->page_len; |
| 195 | unsigned int flags = MSG_MORE | MSG_SENDPAGE_NOTLAST; |
| 196 | int slen; |
| 197 | int len = 0; |
| 198 | |
| 199 | slen = xdr->len; |
| 200 | |
| 201 | /* send head */ |
| 202 | if (slen == xdr->head[0].iov_len) |
| 203 | flags = 0; |
| 204 | len = kernel_sendpage(sock, headpage, headoffset, |
| 205 | xdr->head[0].iov_len, flags); |
| 206 | if (len != xdr->head[0].iov_len) |
| 207 | goto out; |
| 208 | slen -= xdr->head[0].iov_len; |
| 209 | if (slen == 0) |
| 210 | goto out; |
| 211 | |
| 212 | /* send page data */ |
| 213 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; |
| 214 | while (pglen > 0) { |
| 215 | if (slen == size) |
| 216 | flags = 0; |
| 217 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
| 218 | if (result > 0) |
| 219 | len += result; |
| 220 | if (result != size) |
| 221 | goto out; |
| 222 | slen -= size; |
| 223 | pglen -= size; |
| 224 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; |
| 225 | base = 0; |
| 226 | ppage++; |
| 227 | } |
| 228 | |
| 229 | /* send tail */ |
| 230 | if (xdr->tail[0].iov_len) { |
| 231 | result = kernel_sendpage(sock, tailpage, tailoffset, |
| 232 | xdr->tail[0].iov_len, 0); |
| 233 | if (result > 0) |
| 234 | len += result; |
| 235 | } |
| 236 | |
| 237 | out: |
| 238 | return len; |
| 239 | } |
| 240 | |
| 241 | |
| 242 | /* |
| 243 | * Generic sendto routine |
| 244 | */ |
| 245 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) |
| 246 | { |
| 247 | struct svc_sock *svsk = |
| 248 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| 249 | struct socket *sock = svsk->sk_sock; |
| 250 | union { |
| 251 | struct cmsghdr hdr; |
| 252 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; |
| 253 | } buffer; |
| 254 | struct cmsghdr *cmh = &buffer.hdr; |
| 255 | int len = 0; |
| 256 | unsigned long tailoff; |
| 257 | unsigned long headoff; |
| 258 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
| 259 | |
| 260 | if (rqstp->rq_prot == IPPROTO_UDP) { |
| 261 | struct msghdr msg = { |
| 262 | .msg_name = &rqstp->rq_addr, |
| 263 | .msg_namelen = rqstp->rq_addrlen, |
| 264 | .msg_control = cmh, |
| 265 | .msg_controllen = sizeof(buffer), |
| 266 | .msg_flags = MSG_MORE, |
| 267 | }; |
| 268 | |
| 269 | svc_set_cmsg_data(rqstp, cmh); |
| 270 | |
| 271 | if (sock_sendmsg(sock, &msg) < 0) |
| 272 | goto out; |
| 273 | } |
| 274 | |
| 275 | tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); |
| 276 | headoff = 0; |
| 277 | len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, |
| 278 | rqstp->rq_respages[0], tailoff); |
| 279 | |
| 280 | out: |
| 281 | dprintk("svc: socket %p sendto([%p %zu... ], %d) = %d (addr %s)\n", |
| 282 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
| 283 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
| 284 | |
| 285 | return len; |
| 286 | } |
| 287 | |
| 288 | /* |
| 289 | * Report socket names for nfsdfs |
| 290 | */ |
| 291 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
| 292 | { |
| 293 | const struct sock *sk = svsk->sk_sk; |
| 294 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? |
| 295 | "udp" : "tcp"; |
| 296 | int len; |
| 297 | |
| 298 | switch (sk->sk_family) { |
| 299 | case PF_INET: |
| 300 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", |
| 301 | proto_name, |
| 302 | &inet_sk(sk)->inet_rcv_saddr, |
| 303 | inet_sk(sk)->inet_num); |
| 304 | break; |
| 305 | #if IS_ENABLED(CONFIG_IPV6) |
| 306 | case PF_INET6: |
| 307 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", |
| 308 | proto_name, |
| 309 | &sk->sk_v6_rcv_saddr, |
| 310 | inet_sk(sk)->inet_num); |
| 311 | break; |
| 312 | #endif |
| 313 | default: |
| 314 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
| 315 | sk->sk_family); |
| 316 | } |
| 317 | |
| 318 | if (len >= remaining) { |
| 319 | *buf = '\0'; |
| 320 | return -ENAMETOOLONG; |
| 321 | } |
| 322 | return len; |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Generic recvfrom routine. |
| 327 | */ |
| 328 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
| 329 | int buflen) |
| 330 | { |
| 331 | struct svc_sock *svsk = |
| 332 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| 333 | struct msghdr msg = { |
| 334 | .msg_flags = MSG_DONTWAIT, |
| 335 | }; |
| 336 | int len; |
| 337 | |
| 338 | rqstp->rq_xprt_hlen = 0; |
| 339 | |
| 340 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
| 341 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
| 342 | msg.msg_flags); |
| 343 | /* If we read a full record, then assume there may be more |
| 344 | * data to read (stream based sockets only!) |
| 345 | */ |
| 346 | if (len == buflen) |
| 347 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
| 348 | |
| 349 | dprintk("svc: socket %p recvfrom(%p, %zu) = %d\n", |
| 350 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
| 351 | return len; |
| 352 | } |
| 353 | |
| 354 | static int svc_partial_recvfrom(struct svc_rqst *rqstp, |
| 355 | struct kvec *iov, int nr, |
| 356 | int buflen, unsigned int base) |
| 357 | { |
| 358 | size_t save_iovlen; |
| 359 | void *save_iovbase; |
| 360 | unsigned int i; |
| 361 | int ret; |
| 362 | |
| 363 | if (base == 0) |
| 364 | return svc_recvfrom(rqstp, iov, nr, buflen); |
| 365 | |
| 366 | for (i = 0; i < nr; i++) { |
| 367 | if (iov[i].iov_len > base) |
| 368 | break; |
| 369 | base -= iov[i].iov_len; |
| 370 | } |
| 371 | save_iovlen = iov[i].iov_len; |
| 372 | save_iovbase = iov[i].iov_base; |
| 373 | iov[i].iov_len -= base; |
| 374 | iov[i].iov_base += base; |
| 375 | ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); |
| 376 | iov[i].iov_len = save_iovlen; |
| 377 | iov[i].iov_base = save_iovbase; |
| 378 | return ret; |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * Set socket snd and rcv buffer lengths |
| 383 | */ |
| 384 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
| 385 | unsigned int rcv) |
| 386 | { |
| 387 | #if 0 |
| 388 | mm_segment_t oldfs; |
| 389 | oldfs = get_fs(); set_fs(KERNEL_DS); |
| 390 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, |
| 391 | (char*)&snd, sizeof(snd)); |
| 392 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, |
| 393 | (char*)&rcv, sizeof(rcv)); |
| 394 | #else |
| 395 | /* sock_setsockopt limits use to sysctl_?mem_max, |
| 396 | * which isn't acceptable. Until that is made conditional |
| 397 | * on not having CAP_SYS_RESOURCE or similar, we go direct... |
| 398 | * DaveM said I could! |
| 399 | */ |
| 400 | lock_sock(sock->sk); |
| 401 | sock->sk->sk_sndbuf = snd * 2; |
| 402 | sock->sk->sk_rcvbuf = rcv * 2; |
| 403 | sock->sk->sk_write_space(sock->sk); |
| 404 | release_sock(sock->sk); |
| 405 | #endif |
| 406 | } |
| 407 | |
| 408 | static int svc_sock_secure_port(struct svc_rqst *rqstp) |
| 409 | { |
| 410 | return svc_port_is_privileged(svc_addr(rqstp)); |
| 411 | } |
| 412 | |
| 413 | /* |
| 414 | * INET callback when data has been received on the socket. |
| 415 | */ |
| 416 | static void svc_data_ready(struct sock *sk) |
| 417 | { |
| 418 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
| 419 | |
| 420 | if (svsk) { |
| 421 | dprintk("svc: socket %p(inet %p), busy=%d\n", |
| 422 | svsk, sk, |
| 423 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
| 424 | |
| 425 | /* Refer to svc_setup_socket() for details. */ |
| 426 | rmb(); |
| 427 | svsk->sk_odata(sk); |
| 428 | if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags)) |
| 429 | svc_xprt_enqueue(&svsk->sk_xprt); |
| 430 | } |
| 431 | } |
| 432 | |
| 433 | /* |
| 434 | * INET callback when space is newly available on the socket. |
| 435 | */ |
| 436 | static void svc_write_space(struct sock *sk) |
| 437 | { |
| 438 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); |
| 439 | |
| 440 | if (svsk) { |
| 441 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", |
| 442 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
| 443 | |
| 444 | /* Refer to svc_setup_socket() for details. */ |
| 445 | rmb(); |
| 446 | svsk->sk_owspace(sk); |
| 447 | svc_xprt_enqueue(&svsk->sk_xprt); |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
| 452 | { |
| 453 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| 454 | |
| 455 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) |
| 456 | return 1; |
| 457 | return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
| 458 | } |
| 459 | |
| 460 | static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt) |
| 461 | { |
| 462 | struct svc_sock *svsk; |
| 463 | struct socket *sock; |
| 464 | struct linger no_linger = { |
| 465 | .l_onoff = 1, |
| 466 | .l_linger = 0, |
| 467 | }; |
| 468 | |
| 469 | svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| 470 | sock = svsk->sk_sock; |
| 471 | kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER, |
| 472 | (char *)&no_linger, sizeof(no_linger)); |
| 473 | } |
| 474 | |
| 475 | /* |
| 476 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo |
| 477 | */ |
| 478 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, |
| 479 | struct cmsghdr *cmh) |
| 480 | { |
| 481 | struct in_pktinfo *pki = CMSG_DATA(cmh); |
| 482 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
| 483 | |
| 484 | if (cmh->cmsg_type != IP_PKTINFO) |
| 485 | return 0; |
| 486 | |
| 487 | daddr->sin_family = AF_INET; |
| 488 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; |
| 489 | return 1; |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * See net/ipv6/datagram.c : ip6_datagram_recv_ctl |
| 494 | */ |
| 495 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, |
| 496 | struct cmsghdr *cmh) |
| 497 | { |
| 498 | struct in6_pktinfo *pki = CMSG_DATA(cmh); |
| 499 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
| 500 | |
| 501 | if (cmh->cmsg_type != IPV6_PKTINFO) |
| 502 | return 0; |
| 503 | |
| 504 | daddr->sin6_family = AF_INET6; |
| 505 | daddr->sin6_addr = pki->ipi6_addr; |
| 506 | daddr->sin6_scope_id = pki->ipi6_ifindex; |
| 507 | return 1; |
| 508 | } |
| 509 | |
| 510 | /* |
| 511 | * Copy the UDP datagram's destination address to the rqstp structure. |
| 512 | * The 'destination' address in this case is the address to which the |
| 513 | * peer sent the datagram, i.e. our local address. For multihomed |
| 514 | * hosts, this can change from msg to msg. Note that only the IP |
| 515 | * address changes, the port number should remain the same. |
| 516 | */ |
| 517 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
| 518 | struct cmsghdr *cmh) |
| 519 | { |
| 520 | switch (cmh->cmsg_level) { |
| 521 | case SOL_IP: |
| 522 | return svc_udp_get_dest_address4(rqstp, cmh); |
| 523 | case SOL_IPV6: |
| 524 | return svc_udp_get_dest_address6(rqstp, cmh); |
| 525 | } |
| 526 | |
| 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | /* |
| 531 | * Receive a datagram from a UDP socket. |
| 532 | */ |
| 533 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
| 534 | { |
| 535 | struct svc_sock *svsk = |
| 536 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| 537 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
| 538 | struct sk_buff *skb; |
| 539 | union { |
| 540 | struct cmsghdr hdr; |
| 541 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; |
| 542 | } buffer; |
| 543 | struct cmsghdr *cmh = &buffer.hdr; |
| 544 | struct msghdr msg = { |
| 545 | .msg_name = svc_addr(rqstp), |
| 546 | .msg_control = cmh, |
| 547 | .msg_controllen = sizeof(buffer), |
| 548 | .msg_flags = MSG_DONTWAIT, |
| 549 | }; |
| 550 | size_t len; |
| 551 | int err; |
| 552 | |
| 553 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
| 554 | /* udp sockets need large rcvbuf as all pending |
| 555 | * requests are still in that buffer. sndbuf must |
| 556 | * also be large enough that there is enough space |
| 557 | * for one reply per thread. We count all threads |
| 558 | * rather than threads in a particular pool, which |
| 559 | * provides an upper bound on the number of threads |
| 560 | * which will access the socket. |
| 561 | */ |
| 562 | svc_sock_setbufsize(svsk->sk_sock, |
| 563 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
| 564 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); |
| 565 | |
| 566 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
| 567 | skb = NULL; |
| 568 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, |
| 569 | 0, 0, MSG_PEEK | MSG_DONTWAIT); |
| 570 | if (err >= 0) |
| 571 | skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err); |
| 572 | |
| 573 | if (skb == NULL) { |
| 574 | if (err != -EAGAIN) { |
| 575 | /* possibly an icmp error */ |
| 576 | dprintk("svc: recvfrom returned error %d\n", -err); |
| 577 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
| 578 | } |
| 579 | return 0; |
| 580 | } |
| 581 | len = svc_addr_len(svc_addr(rqstp)); |
| 582 | rqstp->rq_addrlen = len; |
| 583 | if (skb->tstamp == 0) { |
| 584 | skb->tstamp = ktime_get_real(); |
| 585 | /* Don't enable netstamp, sunrpc doesn't |
| 586 | need that much accuracy */ |
| 587 | } |
| 588 | sock_write_timestamp(svsk->sk_sk, skb->tstamp); |
| 589 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
| 590 | |
| 591 | len = skb->len; |
| 592 | rqstp->rq_arg.len = len; |
| 593 | |
| 594 | rqstp->rq_prot = IPPROTO_UDP; |
| 595 | |
| 596 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
| 597 | net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", |
| 598 | cmh->cmsg_level, cmh->cmsg_type); |
| 599 | goto out_free; |
| 600 | } |
| 601 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
| 602 | |
| 603 | if (skb_is_nonlinear(skb)) { |
| 604 | /* we have to copy */ |
| 605 | local_bh_disable(); |
| 606 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { |
| 607 | local_bh_enable(); |
| 608 | /* checksum error */ |
| 609 | goto out_free; |
| 610 | } |
| 611 | local_bh_enable(); |
| 612 | consume_skb(skb); |
| 613 | } else { |
| 614 | /* we can use it in-place */ |
| 615 | rqstp->rq_arg.head[0].iov_base = skb->data; |
| 616 | rqstp->rq_arg.head[0].iov_len = len; |
| 617 | if (skb_checksum_complete(skb)) |
| 618 | goto out_free; |
| 619 | rqstp->rq_xprt_ctxt = skb; |
| 620 | } |
| 621 | |
| 622 | rqstp->rq_arg.page_base = 0; |
| 623 | if (len <= rqstp->rq_arg.head[0].iov_len) { |
| 624 | rqstp->rq_arg.head[0].iov_len = len; |
| 625 | rqstp->rq_arg.page_len = 0; |
| 626 | rqstp->rq_respages = rqstp->rq_pages+1; |
| 627 | } else { |
| 628 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; |
| 629 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
| 630 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
| 631 | } |
| 632 | rqstp->rq_next_page = rqstp->rq_respages+1; |
| 633 | |
| 634 | if (serv->sv_stats) |
| 635 | serv->sv_stats->netudpcnt++; |
| 636 | |
| 637 | return len; |
| 638 | out_free: |
| 639 | kfree_skb(skb); |
| 640 | return 0; |
| 641 | } |
| 642 | |
| 643 | static int |
| 644 | svc_udp_sendto(struct svc_rqst *rqstp) |
| 645 | { |
| 646 | int error; |
| 647 | |
| 648 | error = svc_sendto(rqstp, &rqstp->rq_res); |
| 649 | if (error == -ECONNREFUSED) |
| 650 | /* ICMP error on earlier request. */ |
| 651 | error = svc_sendto(rqstp, &rqstp->rq_res); |
| 652 | |
| 653 | return error; |
| 654 | } |
| 655 | |
| 656 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
| 657 | { |
| 658 | } |
| 659 | |
| 660 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
| 661 | { |
| 662 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| 663 | struct svc_serv *serv = xprt->xpt_server; |
| 664 | unsigned long required; |
| 665 | |
| 666 | /* |
| 667 | * Set the SOCK_NOSPACE flag before checking the available |
| 668 | * sock space. |
| 669 | */ |
| 670 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
| 671 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
| 672 | if (required*2 > sock_wspace(svsk->sk_sk)) |
| 673 | return 0; |
| 674 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
| 675 | return 1; |
| 676 | } |
| 677 | |
| 678 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
| 679 | { |
| 680 | BUG(); |
| 681 | return NULL; |
| 682 | } |
| 683 | |
| 684 | static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt) |
| 685 | { |
| 686 | } |
| 687 | |
| 688 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
| 689 | struct net *net, |
| 690 | struct sockaddr *sa, int salen, |
| 691 | int flags) |
| 692 | { |
| 693 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
| 694 | } |
| 695 | |
| 696 | static const struct svc_xprt_ops svc_udp_ops = { |
| 697 | .xpo_create = svc_udp_create, |
| 698 | .xpo_recvfrom = svc_udp_recvfrom, |
| 699 | .xpo_sendto = svc_udp_sendto, |
| 700 | .xpo_release_rqst = svc_release_udp_skb, |
| 701 | .xpo_detach = svc_sock_detach, |
| 702 | .xpo_free = svc_sock_free, |
| 703 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
| 704 | .xpo_has_wspace = svc_udp_has_wspace, |
| 705 | .xpo_accept = svc_udp_accept, |
| 706 | .xpo_secure_port = svc_sock_secure_port, |
| 707 | .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt, |
| 708 | }; |
| 709 | |
| 710 | static struct svc_xprt_class svc_udp_class = { |
| 711 | .xcl_name = "udp", |
| 712 | .xcl_owner = THIS_MODULE, |
| 713 | .xcl_ops = &svc_udp_ops, |
| 714 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
| 715 | .xcl_ident = XPRT_TRANSPORT_UDP, |
| 716 | }; |
| 717 | |
| 718 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
| 719 | { |
| 720 | int err, level, optname, one = 1; |
| 721 | |
| 722 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
| 723 | &svsk->sk_xprt, serv); |
| 724 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
| 725 | svsk->sk_sk->sk_data_ready = svc_data_ready; |
| 726 | svsk->sk_sk->sk_write_space = svc_write_space; |
| 727 | |
| 728 | /* initialise setting must have enough space to |
| 729 | * receive and respond to one request. |
| 730 | * svc_udp_recvfrom will re-adjust if necessary |
| 731 | */ |
| 732 | svc_sock_setbufsize(svsk->sk_sock, |
| 733 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
| 734 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); |
| 735 | |
| 736 | /* data might have come in before data_ready set up */ |
| 737 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
| 738 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
| 739 | |
| 740 | /* make sure we get destination address info */ |
| 741 | switch (svsk->sk_sk->sk_family) { |
| 742 | case AF_INET: |
| 743 | level = SOL_IP; |
| 744 | optname = IP_PKTINFO; |
| 745 | break; |
| 746 | case AF_INET6: |
| 747 | level = SOL_IPV6; |
| 748 | optname = IPV6_RECVPKTINFO; |
| 749 | break; |
| 750 | default: |
| 751 | BUG(); |
| 752 | } |
| 753 | err = kernel_setsockopt(svsk->sk_sock, level, optname, |
| 754 | (char *)&one, sizeof(one)); |
| 755 | dprintk("svc: kernel_setsockopt returned %d\n", err); |
| 756 | } |
| 757 | |
| 758 | /* |
| 759 | * A data_ready event on a listening socket means there's a connection |
| 760 | * pending. Do not use state_change as a substitute for it. |
| 761 | */ |
| 762 | static void svc_tcp_listen_data_ready(struct sock *sk) |
| 763 | { |
| 764 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
| 765 | |
| 766 | dprintk("svc: socket %p TCP (listen) state change %d\n", |
| 767 | sk, sk->sk_state); |
| 768 | |
| 769 | if (svsk) { |
| 770 | /* Refer to svc_setup_socket() for details. */ |
| 771 | rmb(); |
| 772 | svsk->sk_odata(sk); |
| 773 | } |
| 774 | |
| 775 | /* |
| 776 | * This callback may called twice when a new connection |
| 777 | * is established as a child socket inherits everything |
| 778 | * from a parent LISTEN socket. |
| 779 | * 1) data_ready method of the parent socket will be called |
| 780 | * when one of child sockets become ESTABLISHED. |
| 781 | * 2) data_ready method of the child socket may be called |
| 782 | * when it receives data before the socket is accepted. |
| 783 | * In case of 2, we should ignore it silently. |
| 784 | */ |
| 785 | if (sk->sk_state == TCP_LISTEN) { |
| 786 | if (svsk) { |
| 787 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
| 788 | svc_xprt_enqueue(&svsk->sk_xprt); |
| 789 | } else |
| 790 | printk("svc: socket %p: no user data\n", sk); |
| 791 | } |
| 792 | } |
| 793 | |
| 794 | /* |
| 795 | * A state change on a connected socket means it's dying or dead. |
| 796 | */ |
| 797 | static void svc_tcp_state_change(struct sock *sk) |
| 798 | { |
| 799 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
| 800 | |
| 801 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", |
| 802 | sk, sk->sk_state, sk->sk_user_data); |
| 803 | |
| 804 | if (!svsk) |
| 805 | printk("svc: socket %p: no user data\n", sk); |
| 806 | else { |
| 807 | /* Refer to svc_setup_socket() for details. */ |
| 808 | rmb(); |
| 809 | svsk->sk_ostate(sk); |
| 810 | if (sk->sk_state != TCP_ESTABLISHED) { |
| 811 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
| 812 | svc_xprt_enqueue(&svsk->sk_xprt); |
| 813 | } |
| 814 | } |
| 815 | } |
| 816 | |
| 817 | /* |
| 818 | * Accept a TCP connection |
| 819 | */ |
| 820 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
| 821 | { |
| 822 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| 823 | struct sockaddr_storage addr; |
| 824 | struct sockaddr *sin = (struct sockaddr *) &addr; |
| 825 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
| 826 | struct socket *sock = svsk->sk_sock; |
| 827 | struct socket *newsock; |
| 828 | struct svc_sock *newsvsk; |
| 829 | int err, slen; |
| 830 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
| 831 | |
| 832 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); |
| 833 | if (!sock) |
| 834 | return NULL; |
| 835 | |
| 836 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
| 837 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
| 838 | if (err < 0) { |
| 839 | if (err == -ENOMEM) |
| 840 | printk(KERN_WARNING "%s: no more sockets!\n", |
| 841 | serv->sv_name); |
| 842 | else if (err != -EAGAIN) |
| 843 | net_warn_ratelimited("%s: accept failed (err %d)!\n", |
| 844 | serv->sv_name, -err); |
| 845 | return NULL; |
| 846 | } |
| 847 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
| 848 | |
| 849 | err = kernel_getpeername(newsock, sin, &slen); |
| 850 | if (err < 0) { |
| 851 | net_warn_ratelimited("%s: peername failed (err %d)!\n", |
| 852 | serv->sv_name, -err); |
| 853 | goto failed; /* aborted connection or whatever */ |
| 854 | } |
| 855 | |
| 856 | /* Ideally, we would want to reject connections from unauthorized |
| 857 | * hosts here, but when we get encryption, the IP of the host won't |
| 858 | * tell us anything. For now just warn about unpriv connections. |
| 859 | */ |
| 860 | if (!svc_port_is_privileged(sin)) { |
| 861 | dprintk("%s: connect from unprivileged port: %s\n", |
| 862 | serv->sv_name, |
| 863 | __svc_print_addr(sin, buf, sizeof(buf))); |
| 864 | } |
| 865 | dprintk("%s: connect from %s\n", serv->sv_name, |
| 866 | __svc_print_addr(sin, buf, sizeof(buf))); |
| 867 | |
| 868 | /* Reset the inherited callbacks before calling svc_setup_socket */ |
| 869 | newsock->sk->sk_state_change = svsk->sk_ostate; |
| 870 | newsock->sk->sk_data_ready = svsk->sk_odata; |
| 871 | newsock->sk->sk_write_space = svsk->sk_owspace; |
| 872 | |
| 873 | /* make sure that a write doesn't block forever when |
| 874 | * low on memory |
| 875 | */ |
| 876 | newsock->sk->sk_sndtimeo = HZ*30; |
| 877 | |
| 878 | newsvsk = svc_setup_socket(serv, newsock, |
| 879 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); |
| 880 | if (IS_ERR(newsvsk)) |
| 881 | goto failed; |
| 882 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
| 883 | err = kernel_getsockname(newsock, sin, &slen); |
| 884 | if (unlikely(err < 0)) { |
| 885 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); |
| 886 | slen = offsetof(struct sockaddr, sa_data); |
| 887 | } |
| 888 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
| 889 | |
| 890 | if (sock_is_loopback(newsock->sk)) |
| 891 | set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); |
| 892 | else |
| 893 | clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); |
| 894 | if (serv->sv_stats) |
| 895 | serv->sv_stats->nettcpconn++; |
| 896 | |
| 897 | return &newsvsk->sk_xprt; |
| 898 | |
| 899 | failed: |
| 900 | sock_release(newsock); |
| 901 | return NULL; |
| 902 | } |
| 903 | |
| 904 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
| 905 | { |
| 906 | unsigned int i, len, npages; |
| 907 | |
| 908 | if (svsk->sk_datalen == 0) |
| 909 | return 0; |
| 910 | len = svsk->sk_datalen; |
| 911 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 912 | for (i = 0; i < npages; i++) { |
| 913 | if (rqstp->rq_pages[i] != NULL) |
| 914 | put_page(rqstp->rq_pages[i]); |
| 915 | BUG_ON(svsk->sk_pages[i] == NULL); |
| 916 | rqstp->rq_pages[i] = svsk->sk_pages[i]; |
| 917 | svsk->sk_pages[i] = NULL; |
| 918 | } |
| 919 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); |
| 920 | return len; |
| 921 | } |
| 922 | |
| 923 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
| 924 | { |
| 925 | unsigned int i, len, npages; |
| 926 | |
| 927 | if (svsk->sk_datalen == 0) |
| 928 | return; |
| 929 | len = svsk->sk_datalen; |
| 930 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 931 | for (i = 0; i < npages; i++) { |
| 932 | svsk->sk_pages[i] = rqstp->rq_pages[i]; |
| 933 | rqstp->rq_pages[i] = NULL; |
| 934 | } |
| 935 | } |
| 936 | |
| 937 | static void svc_tcp_clear_pages(struct svc_sock *svsk) |
| 938 | { |
| 939 | unsigned int i, len, npages; |
| 940 | |
| 941 | if (svsk->sk_datalen == 0) |
| 942 | goto out; |
| 943 | len = svsk->sk_datalen; |
| 944 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 945 | for (i = 0; i < npages; i++) { |
| 946 | if (svsk->sk_pages[i] == NULL) { |
| 947 | WARN_ON_ONCE(1); |
| 948 | continue; |
| 949 | } |
| 950 | put_page(svsk->sk_pages[i]); |
| 951 | svsk->sk_pages[i] = NULL; |
| 952 | } |
| 953 | out: |
| 954 | svsk->sk_tcplen = 0; |
| 955 | svsk->sk_datalen = 0; |
| 956 | } |
| 957 | |
| 958 | /* |
| 959 | * Receive fragment record header. |
| 960 | * If we haven't gotten the record length yet, get the next four bytes. |
| 961 | */ |
| 962 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
| 963 | { |
| 964 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
| 965 | unsigned int want; |
| 966 | int len; |
| 967 | |
| 968 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
| 969 | struct kvec iov; |
| 970 | |
| 971 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
| 972 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
| 973 | iov.iov_len = want; |
| 974 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) |
| 975 | goto error; |
| 976 | svsk->sk_tcplen += len; |
| 977 | |
| 978 | if (len < want) { |
| 979 | dprintk("svc: short recvfrom while reading record " |
| 980 | "length (%d of %d)\n", len, want); |
| 981 | return -EAGAIN; |
| 982 | } |
| 983 | |
| 984 | dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk)); |
| 985 | if (svc_sock_reclen(svsk) + svsk->sk_datalen > |
| 986 | serv->sv_max_mesg) { |
| 987 | net_notice_ratelimited("RPC: fragment too large: %d\n", |
| 988 | svc_sock_reclen(svsk)); |
| 989 | goto err_delete; |
| 990 | } |
| 991 | } |
| 992 | |
| 993 | return svc_sock_reclen(svsk); |
| 994 | error: |
| 995 | dprintk("RPC: TCP recv_record got %d\n", len); |
| 996 | return len; |
| 997 | err_delete: |
| 998 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
| 999 | return -EAGAIN; |
| 1000 | } |
| 1001 | |
| 1002 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
| 1003 | { |
| 1004 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
| 1005 | struct rpc_rqst *req = NULL; |
| 1006 | struct kvec *src, *dst; |
| 1007 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
| 1008 | __be32 xid; |
| 1009 | __be32 calldir; |
| 1010 | |
| 1011 | xid = *p++; |
| 1012 | calldir = *p; |
| 1013 | |
| 1014 | if (!bc_xprt) |
| 1015 | return -EAGAIN; |
| 1016 | spin_lock(&bc_xprt->recv_lock); |
| 1017 | req = xprt_lookup_rqst(bc_xprt, xid); |
| 1018 | if (!req) |
| 1019 | goto unlock_notfound; |
| 1020 | |
| 1021 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); |
| 1022 | /* |
| 1023 | * XXX!: cheating for now! Only copying HEAD. |
| 1024 | * But we know this is good enough for now (in fact, for any |
| 1025 | * callback reply in the forseeable future). |
| 1026 | */ |
| 1027 | dst = &req->rq_private_buf.head[0]; |
| 1028 | src = &rqstp->rq_arg.head[0]; |
| 1029 | if (dst->iov_len < src->iov_len) |
| 1030 | goto unlock_eagain; /* whatever; just giving up. */ |
| 1031 | memcpy(dst->iov_base, src->iov_base, src->iov_len); |
| 1032 | xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); |
| 1033 | rqstp->rq_arg.len = 0; |
| 1034 | spin_unlock(&bc_xprt->recv_lock); |
| 1035 | return 0; |
| 1036 | unlock_notfound: |
| 1037 | printk(KERN_NOTICE |
| 1038 | "%s: Got unrecognized reply: " |
| 1039 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", |
| 1040 | __func__, ntohl(calldir), |
| 1041 | bc_xprt, ntohl(xid)); |
| 1042 | unlock_eagain: |
| 1043 | spin_unlock(&bc_xprt->recv_lock); |
| 1044 | return -EAGAIN; |
| 1045 | } |
| 1046 | |
| 1047 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) |
| 1048 | { |
| 1049 | int i = 0; |
| 1050 | int t = 0; |
| 1051 | |
| 1052 | while (t < len) { |
| 1053 | vec[i].iov_base = page_address(pages[i]); |
| 1054 | vec[i].iov_len = PAGE_SIZE; |
| 1055 | i++; |
| 1056 | t += PAGE_SIZE; |
| 1057 | } |
| 1058 | return i; |
| 1059 | } |
| 1060 | |
| 1061 | static void svc_tcp_fragment_received(struct svc_sock *svsk) |
| 1062 | { |
| 1063 | /* If we have more data, signal svc_xprt_enqueue() to try again */ |
| 1064 | dprintk("svc: TCP %s record (%d bytes)\n", |
| 1065 | svc_sock_final_rec(svsk) ? "final" : "nonfinal", |
| 1066 | svc_sock_reclen(svsk)); |
| 1067 | svsk->sk_tcplen = 0; |
| 1068 | svsk->sk_reclen = 0; |
| 1069 | } |
| 1070 | |
| 1071 | /* |
| 1072 | * Receive data from a TCP socket. |
| 1073 | */ |
| 1074 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) |
| 1075 | { |
| 1076 | struct svc_sock *svsk = |
| 1077 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| 1078 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
| 1079 | int len; |
| 1080 | struct kvec *vec; |
| 1081 | unsigned int want, base; |
| 1082 | __be32 *p; |
| 1083 | __be32 calldir; |
| 1084 | int pnum; |
| 1085 | |
| 1086 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", |
| 1087 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), |
| 1088 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), |
| 1089 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); |
| 1090 | |
| 1091 | len = svc_tcp_recv_record(svsk, rqstp); |
| 1092 | if (len < 0) |
| 1093 | goto error; |
| 1094 | |
| 1095 | base = svc_tcp_restore_pages(svsk, rqstp); |
| 1096 | want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); |
| 1097 | |
| 1098 | vec = rqstp->rq_vec; |
| 1099 | |
| 1100 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], |
| 1101 | svsk->sk_datalen + want); |
| 1102 | |
| 1103 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
| 1104 | rqstp->rq_next_page = rqstp->rq_respages + 1; |
| 1105 | |
| 1106 | /* Now receive data */ |
| 1107 | len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); |
| 1108 | if (len >= 0) { |
| 1109 | svsk->sk_tcplen += len; |
| 1110 | svsk->sk_datalen += len; |
| 1111 | } |
| 1112 | if (len != want || !svc_sock_final_rec(svsk)) { |
| 1113 | svc_tcp_save_pages(svsk, rqstp); |
| 1114 | if (len < 0 && len != -EAGAIN) |
| 1115 | goto err_delete; |
| 1116 | if (len == want) |
| 1117 | svc_tcp_fragment_received(svsk); |
| 1118 | else |
| 1119 | dprintk("svc: incomplete TCP record (%d of %d)\n", |
| 1120 | (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)), |
| 1121 | svc_sock_reclen(svsk)); |
| 1122 | goto err_noclose; |
| 1123 | } |
| 1124 | |
| 1125 | if (svsk->sk_datalen < 8) { |
| 1126 | svsk->sk_datalen = 0; |
| 1127 | goto err_delete; /* client is nuts. */ |
| 1128 | } |
| 1129 | |
| 1130 | rqstp->rq_arg.len = svsk->sk_datalen; |
| 1131 | rqstp->rq_arg.page_base = 0; |
| 1132 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
| 1133 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; |
| 1134 | rqstp->rq_arg.page_len = 0; |
| 1135 | } else |
| 1136 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; |
| 1137 | |
| 1138 | rqstp->rq_xprt_ctxt = NULL; |
| 1139 | rqstp->rq_prot = IPPROTO_TCP; |
| 1140 | if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags)) |
| 1141 | set_bit(RQ_LOCAL, &rqstp->rq_flags); |
| 1142 | else |
| 1143 | clear_bit(RQ_LOCAL, &rqstp->rq_flags); |
| 1144 | |
| 1145 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
| 1146 | calldir = p[1]; |
| 1147 | if (calldir) |
| 1148 | len = receive_cb_reply(svsk, rqstp); |
| 1149 | |
| 1150 | /* Reset TCP read info */ |
| 1151 | svsk->sk_datalen = 0; |
| 1152 | svc_tcp_fragment_received(svsk); |
| 1153 | |
| 1154 | if (len < 0) |
| 1155 | goto error; |
| 1156 | |
| 1157 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
| 1158 | if (serv->sv_stats) |
| 1159 | serv->sv_stats->nettcpcnt++; |
| 1160 | |
| 1161 | return rqstp->rq_arg.len; |
| 1162 | |
| 1163 | error: |
| 1164 | if (len != -EAGAIN) |
| 1165 | goto err_delete; |
| 1166 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); |
| 1167 | return 0; |
| 1168 | err_delete: |
| 1169 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", |
| 1170 | svsk->sk_xprt.xpt_server->sv_name, -len); |
| 1171 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
| 1172 | err_noclose: |
| 1173 | return 0; /* record not complete */ |
| 1174 | } |
| 1175 | |
| 1176 | /* |
| 1177 | * Send out data on TCP socket. |
| 1178 | */ |
| 1179 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
| 1180 | { |
| 1181 | struct xdr_buf *xbufp = &rqstp->rq_res; |
| 1182 | int sent; |
| 1183 | __be32 reclen; |
| 1184 | |
| 1185 | /* Set up the first element of the reply kvec. |
| 1186 | * Any other kvecs that may be in use have been taken |
| 1187 | * care of by the server implementation itself. |
| 1188 | */ |
| 1189 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); |
| 1190 | memcpy(xbufp->head[0].iov_base, &reclen, 4); |
| 1191 | |
| 1192 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
| 1193 | if (sent != xbufp->len) { |
| 1194 | printk(KERN_NOTICE |
| 1195 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " |
| 1196 | "- shutting down socket\n", |
| 1197 | rqstp->rq_xprt->xpt_server->sv_name, |
| 1198 | (sent<0)?"got error":"sent only", |
| 1199 | sent, xbufp->len); |
| 1200 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
| 1201 | svc_xprt_enqueue(rqstp->rq_xprt); |
| 1202 | sent = -EAGAIN; |
| 1203 | } |
| 1204 | return sent; |
| 1205 | } |
| 1206 | |
| 1207 | /* |
| 1208 | * Setup response header. TCP has a 4B record length field. |
| 1209 | */ |
| 1210 | void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) |
| 1211 | { |
| 1212 | struct kvec *resv = &rqstp->rq_res.head[0]; |
| 1213 | |
| 1214 | /* tcp needs a space for the record length... */ |
| 1215 | svc_putnl(resv, 0); |
| 1216 | } |
| 1217 | |
| 1218 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
| 1219 | struct net *net, |
| 1220 | struct sockaddr *sa, int salen, |
| 1221 | int flags) |
| 1222 | { |
| 1223 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
| 1224 | } |
| 1225 | |
| 1226 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
| 1227 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
| 1228 | struct net *, struct sockaddr *, |
| 1229 | int, int); |
| 1230 | static void svc_bc_sock_free(struct svc_xprt *xprt); |
| 1231 | |
| 1232 | static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, |
| 1233 | struct net *net, |
| 1234 | struct sockaddr *sa, int salen, |
| 1235 | int flags) |
| 1236 | { |
| 1237 | return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
| 1238 | } |
| 1239 | |
| 1240 | static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) |
| 1241 | { |
| 1242 | } |
| 1243 | |
| 1244 | static const struct svc_xprt_ops svc_tcp_bc_ops = { |
| 1245 | .xpo_create = svc_bc_tcp_create, |
| 1246 | .xpo_detach = svc_bc_tcp_sock_detach, |
| 1247 | .xpo_free = svc_bc_sock_free, |
| 1248 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
| 1249 | .xpo_secure_port = svc_sock_secure_port, |
| 1250 | }; |
| 1251 | |
| 1252 | static struct svc_xprt_class svc_tcp_bc_class = { |
| 1253 | .xcl_name = "tcp-bc", |
| 1254 | .xcl_owner = THIS_MODULE, |
| 1255 | .xcl_ops = &svc_tcp_bc_ops, |
| 1256 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
| 1257 | }; |
| 1258 | |
| 1259 | static void svc_init_bc_xprt_sock(void) |
| 1260 | { |
| 1261 | svc_reg_xprt_class(&svc_tcp_bc_class); |
| 1262 | } |
| 1263 | |
| 1264 | static void svc_cleanup_bc_xprt_sock(void) |
| 1265 | { |
| 1266 | svc_unreg_xprt_class(&svc_tcp_bc_class); |
| 1267 | } |
| 1268 | #else /* CONFIG_SUNRPC_BACKCHANNEL */ |
| 1269 | static void svc_init_bc_xprt_sock(void) |
| 1270 | { |
| 1271 | } |
| 1272 | |
| 1273 | static void svc_cleanup_bc_xprt_sock(void) |
| 1274 | { |
| 1275 | } |
| 1276 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
| 1277 | |
| 1278 | static const struct svc_xprt_ops svc_tcp_ops = { |
| 1279 | .xpo_create = svc_tcp_create, |
| 1280 | .xpo_recvfrom = svc_tcp_recvfrom, |
| 1281 | .xpo_sendto = svc_tcp_sendto, |
| 1282 | .xpo_release_rqst = svc_release_skb, |
| 1283 | .xpo_detach = svc_tcp_sock_detach, |
| 1284 | .xpo_free = svc_sock_free, |
| 1285 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
| 1286 | .xpo_has_wspace = svc_tcp_has_wspace, |
| 1287 | .xpo_accept = svc_tcp_accept, |
| 1288 | .xpo_secure_port = svc_sock_secure_port, |
| 1289 | .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt, |
| 1290 | }; |
| 1291 | |
| 1292 | static struct svc_xprt_class svc_tcp_class = { |
| 1293 | .xcl_name = "tcp", |
| 1294 | .xcl_owner = THIS_MODULE, |
| 1295 | .xcl_ops = &svc_tcp_ops, |
| 1296 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
| 1297 | .xcl_ident = XPRT_TRANSPORT_TCP, |
| 1298 | }; |
| 1299 | |
| 1300 | void svc_init_xprt_sock(void) |
| 1301 | { |
| 1302 | svc_reg_xprt_class(&svc_tcp_class); |
| 1303 | svc_reg_xprt_class(&svc_udp_class); |
| 1304 | svc_init_bc_xprt_sock(); |
| 1305 | } |
| 1306 | |
| 1307 | void svc_cleanup_xprt_sock(void) |
| 1308 | { |
| 1309 | svc_unreg_xprt_class(&svc_tcp_class); |
| 1310 | svc_unreg_xprt_class(&svc_udp_class); |
| 1311 | svc_cleanup_bc_xprt_sock(); |
| 1312 | } |
| 1313 | |
| 1314 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
| 1315 | { |
| 1316 | struct sock *sk = svsk->sk_sk; |
| 1317 | |
| 1318 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
| 1319 | &svsk->sk_xprt, serv); |
| 1320 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
| 1321 | set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags); |
| 1322 | if (sk->sk_state == TCP_LISTEN) { |
| 1323 | dprintk("setting up TCP socket for listening\n"); |
| 1324 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
| 1325 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
| 1326 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
| 1327 | } else { |
| 1328 | dprintk("setting up TCP socket for reading\n"); |
| 1329 | sk->sk_state_change = svc_tcp_state_change; |
| 1330 | sk->sk_data_ready = svc_data_ready; |
| 1331 | sk->sk_write_space = svc_write_space; |
| 1332 | |
| 1333 | svsk->sk_reclen = 0; |
| 1334 | svsk->sk_tcplen = 0; |
| 1335 | svsk->sk_datalen = 0; |
| 1336 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
| 1337 | |
| 1338 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
| 1339 | |
| 1340 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
| 1341 | switch (sk->sk_state) { |
| 1342 | case TCP_SYN_RECV: |
| 1343 | case TCP_ESTABLISHED: |
| 1344 | break; |
| 1345 | default: |
| 1346 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
| 1347 | } |
| 1348 | } |
| 1349 | } |
| 1350 | |
| 1351 | void svc_sock_update_bufs(struct svc_serv *serv) |
| 1352 | { |
| 1353 | /* |
| 1354 | * The number of server threads has changed. Update |
| 1355 | * rcvbuf and sndbuf accordingly on all sockets |
| 1356 | */ |
| 1357 | struct svc_sock *svsk; |
| 1358 | |
| 1359 | spin_lock_bh(&serv->sv_lock); |
| 1360 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
| 1361 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
| 1362 | spin_unlock_bh(&serv->sv_lock); |
| 1363 | } |
| 1364 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
| 1365 | |
| 1366 | /* |
| 1367 | * Initialize socket for RPC use and create svc_sock struct |
| 1368 | */ |
| 1369 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
| 1370 | struct socket *sock, |
| 1371 | int flags) |
| 1372 | { |
| 1373 | struct svc_sock *svsk; |
| 1374 | struct sock *inet; |
| 1375 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
| 1376 | int err = 0; |
| 1377 | |
| 1378 | dprintk("svc: svc_setup_socket %p\n", sock); |
| 1379 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
| 1380 | if (!svsk) |
| 1381 | return ERR_PTR(-ENOMEM); |
| 1382 | |
| 1383 | inet = sock->sk; |
| 1384 | |
| 1385 | /* Register socket with portmapper */ |
| 1386 | if (pmap_register) |
| 1387 | err = svc_register(serv, sock_net(sock->sk), inet->sk_family, |
| 1388 | inet->sk_protocol, |
| 1389 | ntohs(inet_sk(inet)->inet_sport)); |
| 1390 | |
| 1391 | if (err < 0) { |
| 1392 | kfree(svsk); |
| 1393 | return ERR_PTR(err); |
| 1394 | } |
| 1395 | |
| 1396 | svsk->sk_sock = sock; |
| 1397 | svsk->sk_sk = inet; |
| 1398 | svsk->sk_ostate = inet->sk_state_change; |
| 1399 | svsk->sk_odata = inet->sk_data_ready; |
| 1400 | svsk->sk_owspace = inet->sk_write_space; |
| 1401 | /* |
| 1402 | * This barrier is necessary in order to prevent race condition |
| 1403 | * with svc_data_ready(), svc_listen_data_ready() and others |
| 1404 | * when calling callbacks above. |
| 1405 | */ |
| 1406 | wmb(); |
| 1407 | inet->sk_user_data = svsk; |
| 1408 | |
| 1409 | /* Initialize the socket */ |
| 1410 | if (sock->type == SOCK_DGRAM) |
| 1411 | svc_udp_init(svsk, serv); |
| 1412 | else |
| 1413 | svc_tcp_init(svsk, serv); |
| 1414 | |
| 1415 | dprintk("svc: svc_setup_socket created %p (inet %p), " |
| 1416 | "listen %d close %d\n", |
| 1417 | svsk, svsk->sk_sk, |
| 1418 | test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags), |
| 1419 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); |
| 1420 | |
| 1421 | return svsk; |
| 1422 | } |
| 1423 | |
| 1424 | bool svc_alien_sock(struct net *net, int fd) |
| 1425 | { |
| 1426 | int err; |
| 1427 | struct socket *sock = sockfd_lookup(fd, &err); |
| 1428 | bool ret = false; |
| 1429 | |
| 1430 | if (!sock) |
| 1431 | goto out; |
| 1432 | if (sock_net(sock->sk) != net) |
| 1433 | ret = true; |
| 1434 | sockfd_put(sock); |
| 1435 | out: |
| 1436 | return ret; |
| 1437 | } |
| 1438 | EXPORT_SYMBOL_GPL(svc_alien_sock); |
| 1439 | |
| 1440 | /** |
| 1441 | * svc_addsock - add a listener socket to an RPC service |
| 1442 | * @serv: pointer to RPC service to which to add a new listener |
| 1443 | * @fd: file descriptor of the new listener |
| 1444 | * @name_return: pointer to buffer to fill in with name of listener |
| 1445 | * @len: size of the buffer |
| 1446 | * |
| 1447 | * Fills in socket name and returns positive length of name if successful. |
| 1448 | * Name is terminated with '\n'. On error, returns a negative errno |
| 1449 | * value. |
| 1450 | */ |
| 1451 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, |
| 1452 | const size_t len) |
| 1453 | { |
| 1454 | int err = 0; |
| 1455 | struct socket *so = sockfd_lookup(fd, &err); |
| 1456 | struct svc_sock *svsk = NULL; |
| 1457 | struct sockaddr_storage addr; |
| 1458 | struct sockaddr *sin = (struct sockaddr *)&addr; |
| 1459 | int salen; |
| 1460 | |
| 1461 | if (!so) |
| 1462 | return err; |
| 1463 | err = -EAFNOSUPPORT; |
| 1464 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
| 1465 | goto out; |
| 1466 | err = -EPROTONOSUPPORT; |
| 1467 | if (so->sk->sk_protocol != IPPROTO_TCP && |
| 1468 | so->sk->sk_protocol != IPPROTO_UDP) |
| 1469 | goto out; |
| 1470 | err = -EISCONN; |
| 1471 | if (so->state > SS_UNCONNECTED) |
| 1472 | goto out; |
| 1473 | err = -ENOENT; |
| 1474 | if (!try_module_get(THIS_MODULE)) |
| 1475 | goto out; |
| 1476 | svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); |
| 1477 | if (IS_ERR(svsk)) { |
| 1478 | module_put(THIS_MODULE); |
| 1479 | err = PTR_ERR(svsk); |
| 1480 | goto out; |
| 1481 | } |
| 1482 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) |
| 1483 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); |
| 1484 | svc_add_new_perm_xprt(serv, &svsk->sk_xprt); |
| 1485 | return svc_one_sock_name(svsk, name_return, len); |
| 1486 | out: |
| 1487 | sockfd_put(so); |
| 1488 | return err; |
| 1489 | } |
| 1490 | EXPORT_SYMBOL_GPL(svc_addsock); |
| 1491 | |
| 1492 | /* |
| 1493 | * Create socket for RPC service. |
| 1494 | */ |
| 1495 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
| 1496 | int protocol, |
| 1497 | struct net *net, |
| 1498 | struct sockaddr *sin, int len, |
| 1499 | int flags) |
| 1500 | { |
| 1501 | struct svc_sock *svsk; |
| 1502 | struct socket *sock; |
| 1503 | int error; |
| 1504 | int type; |
| 1505 | struct sockaddr_storage addr; |
| 1506 | struct sockaddr *newsin = (struct sockaddr *)&addr; |
| 1507 | int newlen; |
| 1508 | int family; |
| 1509 | int val; |
| 1510 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
| 1511 | |
| 1512 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
| 1513 | serv->sv_program->pg_name, protocol, |
| 1514 | __svc_print_addr(sin, buf, sizeof(buf))); |
| 1515 | |
| 1516 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { |
| 1517 | printk(KERN_WARNING "svc: only UDP and TCP " |
| 1518 | "sockets supported\n"); |
| 1519 | return ERR_PTR(-EINVAL); |
| 1520 | } |
| 1521 | |
| 1522 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
| 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 | } |
| 1533 | |
| 1534 | error = __sock_create(net, family, type, protocol, &sock, 1); |
| 1535 | if (error < 0) |
| 1536 | return ERR_PTR(error); |
| 1537 | |
| 1538 | svc_reclassify_socket(sock); |
| 1539 | |
| 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 | |
| 1550 | if (type == SOCK_STREAM) |
| 1551 | sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ |
| 1552 | error = kernel_bind(sock, sin, len); |
| 1553 | if (error < 0) |
| 1554 | goto bummer; |
| 1555 | |
| 1556 | newlen = len; |
| 1557 | error = kernel_getsockname(sock, newsin, &newlen); |
| 1558 | if (error < 0) |
| 1559 | goto bummer; |
| 1560 | |
| 1561 | if (protocol == IPPROTO_TCP) { |
| 1562 | if ((error = kernel_listen(sock, 64)) < 0) |
| 1563 | goto bummer; |
| 1564 | } |
| 1565 | |
| 1566 | svsk = svc_setup_socket(serv, sock, flags); |
| 1567 | if (IS_ERR(svsk)) { |
| 1568 | error = PTR_ERR(svsk); |
| 1569 | goto bummer; |
| 1570 | } |
| 1571 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
| 1572 | return (struct svc_xprt *)svsk; |
| 1573 | bummer: |
| 1574 | dprintk("svc: svc_create_socket error = %d\n", -error); |
| 1575 | sock_release(sock); |
| 1576 | return ERR_PTR(error); |
| 1577 | } |
| 1578 | |
| 1579 | /* |
| 1580 | * Detach the svc_sock from the socket so that no |
| 1581 | * more callbacks occur. |
| 1582 | */ |
| 1583 | static void svc_sock_detach(struct svc_xprt *xprt) |
| 1584 | { |
| 1585 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| 1586 | struct sock *sk = svsk->sk_sk; |
| 1587 | |
| 1588 | dprintk("svc: svc_sock_detach(%p)\n", svsk); |
| 1589 | |
| 1590 | /* put back the old socket callbacks */ |
| 1591 | lock_sock(sk); |
| 1592 | sk->sk_state_change = svsk->sk_ostate; |
| 1593 | sk->sk_data_ready = svsk->sk_odata; |
| 1594 | sk->sk_write_space = svsk->sk_owspace; |
| 1595 | sk->sk_user_data = NULL; |
| 1596 | release_sock(sk); |
| 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 | |
| 1610 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
| 1611 | svc_tcp_clear_pages(svsk); |
| 1612 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
| 1613 | } |
| 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 | |
| 1624 | if (svsk->sk_sock->file) |
| 1625 | sockfd_put(svsk->sk_sock); |
| 1626 | else |
| 1627 | sock_release(svsk->sk_sock); |
| 1628 | kfree(svsk); |
| 1629 | } |
| 1630 | |
| 1631 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
| 1632 | /* |
| 1633 | * Create a back channel svc_xprt which shares the fore channel socket. |
| 1634 | */ |
| 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) |
| 1640 | { |
| 1641 | struct svc_sock *svsk; |
| 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 | } |
| 1649 | |
| 1650 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
| 1651 | if (!svsk) |
| 1652 | return ERR_PTR(-ENOMEM); |
| 1653 | |
| 1654 | xprt = &svsk->sk_xprt; |
| 1655 | svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); |
| 1656 | set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags); |
| 1657 | |
| 1658 | serv->sv_bc_xprt = xprt; |
| 1659 | |
| 1660 | return xprt; |
| 1661 | } |
| 1662 | |
| 1663 | /* |
| 1664 | * Free a back channel svc_sock. |
| 1665 | */ |
| 1666 | static void svc_bc_sock_free(struct svc_xprt *xprt) |
| 1667 | { |
| 1668 | if (xprt) |
| 1669 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); |
| 1670 | } |
| 1671 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |