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 #ifdef CONFIG_DEBUG_LOCK_ALLOC 74 static struct lock_class_key svc_key[2]; 75 static struct lock_class_key svc_slock_key[2]; 76 77 static void svc_reclassify_socket(struct socket *sock) 78 { 79 struct sock *sk = sock->sk; 80 81 if (WARN_ON_ONCE(!sock_allow_reclassification(sk))) 82 return; 83 84 switch (sk->sk_family) { 85 case AF_INET: 86 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", 87 &svc_slock_key[0], 88 "sk_xprt.xpt_lock-AF_INET-NFSD", 89 &svc_key[0]); 90 break; 91 92 case AF_INET6: 93 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", 94 &svc_slock_key[1], 95 "sk_xprt.xpt_lock-AF_INET6-NFSD", 96 &svc_key[1]); 97 break; 98 99 default: 100 BUG(); 101 } 102 } 103 #else 104 static void svc_reclassify_socket(struct socket *sock) 105 { 106 } 107 #endif 108 109 /* 110 * Release an skbuff after use 111 */ 112 static void svc_release_skb(struct svc_rqst *rqstp) 113 { 114 struct sk_buff *skb = rqstp->rq_xprt_ctxt; 115 116 if (skb) { 117 struct svc_sock *svsk = 118 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 119 rqstp->rq_xprt_ctxt = NULL; 120 121 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); 122 skb_free_datagram_locked(svsk->sk_sk, skb); 123 } 124 } 125 126 static void svc_release_udp_skb(struct svc_rqst *rqstp) 127 { 128 struct sk_buff *skb = rqstp->rq_xprt_ctxt; 129 130 if (skb) { 131 rqstp->rq_xprt_ctxt = NULL; 132 133 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); 134 consume_skb(skb); 135 } 136 } 137 138 union svc_pktinfo_u { 139 struct in_pktinfo pkti; 140 struct in6_pktinfo pkti6; 141 }; 142 #define SVC_PKTINFO_SPACE \ 143 CMSG_SPACE(sizeof(union svc_pktinfo_u)) 144 145 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) 146 { 147 struct svc_sock *svsk = 148 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 149 switch (svsk->sk_sk->sk_family) { 150 case AF_INET: { 151 struct in_pktinfo *pki = CMSG_DATA(cmh); 152 153 cmh->cmsg_level = SOL_IP; 154 cmh->cmsg_type = IP_PKTINFO; 155 pki->ipi_ifindex = 0; 156 pki->ipi_spec_dst.s_addr = 157 svc_daddr_in(rqstp)->sin_addr.s_addr; 158 cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); 159 } 160 break; 161 162 case AF_INET6: { 163 struct in6_pktinfo *pki = CMSG_DATA(cmh); 164 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); 165 166 cmh->cmsg_level = SOL_IPV6; 167 cmh->cmsg_type = IPV6_PKTINFO; 168 pki->ipi6_ifindex = daddr->sin6_scope_id; 169 pki->ipi6_addr = daddr->sin6_addr; 170 cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); 171 } 172 break; 173 } 174 } 175 176 /* 177 * send routine intended to be shared by the fore- and back-channel 178 */ 179 int svc_send_common(struct socket *sock, struct xdr_buf *xdr, 180 struct page *headpage, unsigned long headoffset, 181 struct page *tailpage, unsigned long tailoffset) 182 { 183 int result; 184 int size; 185 struct page **ppage = xdr->pages; 186 size_t base = xdr->page_base; 187 unsigned int pglen = xdr->page_len; 188 unsigned int flags = MSG_MORE | MSG_SENDPAGE_NOTLAST; 189 int slen; 190 int len = 0; 191 192 slen = xdr->len; 193 194 /* send head */ 195 if (slen == xdr->head[0].iov_len) 196 flags = 0; 197 len = kernel_sendpage(sock, headpage, headoffset, 198 xdr->head[0].iov_len, flags); 199 if (len != xdr->head[0].iov_len) 200 goto out; 201 slen -= xdr->head[0].iov_len; 202 if (slen == 0) 203 goto out; 204 205 /* send page data */ 206 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; 207 while (pglen > 0) { 208 if (slen == size) 209 flags = 0; 210 result = kernel_sendpage(sock, *ppage, base, size, flags); 211 if (result > 0) 212 len += result; 213 if (result != size) 214 goto out; 215 slen -= size; 216 pglen -= size; 217 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; 218 base = 0; 219 ppage++; 220 } 221 222 /* send tail */ 223 if (xdr->tail[0].iov_len) { 224 result = kernel_sendpage(sock, tailpage, tailoffset, 225 xdr->tail[0].iov_len, 0); 226 if (result > 0) 227 len += result; 228 } 229 230 out: 231 return len; 232 } 233 234 235 /* 236 * Generic sendto routine 237 */ 238 static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) 239 { 240 struct svc_sock *svsk = 241 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 242 struct socket *sock = svsk->sk_sock; 243 union { 244 struct cmsghdr hdr; 245 long all[SVC_PKTINFO_SPACE / sizeof(long)]; 246 } buffer; 247 struct cmsghdr *cmh = &buffer.hdr; 248 int len = 0; 249 unsigned long tailoff; 250 unsigned long headoff; 251 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 252 253 if (rqstp->rq_prot == IPPROTO_UDP) { 254 struct msghdr msg = { 255 .msg_name = &rqstp->rq_addr, 256 .msg_namelen = rqstp->rq_addrlen, 257 .msg_control = cmh, 258 .msg_controllen = sizeof(buffer), 259 .msg_flags = MSG_MORE, 260 }; 261 262 svc_set_cmsg_data(rqstp, cmh); 263 264 if (sock_sendmsg(sock, &msg) < 0) 265 goto out; 266 } 267 268 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); 269 headoff = 0; 270 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, 271 rqstp->rq_respages[0], tailoff); 272 273 out: 274 dprintk("svc: socket %p sendto([%p %zu... ], %d) = %d (addr %s)\n", 275 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, 276 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); 277 278 return len; 279 } 280 281 /* 282 * Report socket names for nfsdfs 283 */ 284 static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) 285 { 286 const struct sock *sk = svsk->sk_sk; 287 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? 288 "udp" : "tcp"; 289 int len; 290 291 switch (sk->sk_family) { 292 case PF_INET: 293 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", 294 proto_name, 295 &inet_sk(sk)->inet_rcv_saddr, 296 inet_sk(sk)->inet_num); 297 break; 298 #if IS_ENABLED(CONFIG_IPV6) 299 case PF_INET6: 300 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", 301 proto_name, 302 &sk->sk_v6_rcv_saddr, 303 inet_sk(sk)->inet_num); 304 break; 305 #endif 306 default: 307 len = snprintf(buf, remaining, "*unknown-%d*\n", 308 sk->sk_family); 309 } 310 311 if (len >= remaining) { 312 *buf = '\0'; 313 return -ENAMETOOLONG; 314 } 315 return len; 316 } 317 318 /* 319 * Generic recvfrom routine. 320 */ 321 static ssize_t svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, 322 unsigned int nr, size_t buflen, unsigned int base) 323 { 324 struct svc_sock *svsk = 325 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 326 struct msghdr msg = { NULL }; 327 ssize_t len; 328 329 rqstp->rq_xprt_hlen = 0; 330 331 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 332 iov_iter_kvec(&msg.msg_iter, READ, iov, nr, buflen); 333 if (base != 0) { 334 iov_iter_advance(&msg.msg_iter, base); 335 buflen -= base; 336 } 337 len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT); 338 /* If we read a full record, then assume there may be more 339 * data to read (stream based sockets only!) 340 */ 341 if (len == buflen) 342 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 343 344 dprintk("svc: socket %p recvfrom(%p, %zu) = %zd\n", 345 svsk, iov[0].iov_base, iov[0].iov_len, len); 346 return len; 347 } 348 349 /* 350 * Set socket snd and rcv buffer lengths 351 */ 352 static void svc_sock_setbufsize(struct svc_sock *svsk, unsigned int nreqs) 353 { 354 unsigned int max_mesg = svsk->sk_xprt.xpt_server->sv_max_mesg; 355 struct socket *sock = svsk->sk_sock; 356 357 nreqs = min(nreqs, INT_MAX / 2 / max_mesg); 358 359 lock_sock(sock->sk); 360 sock->sk->sk_sndbuf = nreqs * max_mesg * 2; 361 sock->sk->sk_rcvbuf = nreqs * max_mesg * 2; 362 sock->sk->sk_write_space(sock->sk); 363 release_sock(sock->sk); 364 } 365 366 static void svc_sock_secure_port(struct svc_rqst *rqstp) 367 { 368 if (svc_port_is_privileged(svc_addr(rqstp))) 369 set_bit(RQ_SECURE, &rqstp->rq_flags); 370 else 371 clear_bit(RQ_SECURE, &rqstp->rq_flags); 372 } 373 374 /* 375 * INET callback when data has been received on the socket. 376 */ 377 static void svc_data_ready(struct sock *sk) 378 { 379 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 380 381 if (svsk) { 382 dprintk("svc: socket %p(inet %p), busy=%d\n", 383 svsk, sk, 384 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); 385 386 /* Refer to svc_setup_socket() for details. */ 387 rmb(); 388 svsk->sk_odata(sk); 389 if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags)) 390 svc_xprt_enqueue(&svsk->sk_xprt); 391 } 392 } 393 394 /* 395 * INET callback when space is newly available on the socket. 396 */ 397 static void svc_write_space(struct sock *sk) 398 { 399 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); 400 401 if (svsk) { 402 dprintk("svc: socket %p(inet %p), write_space busy=%d\n", 403 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); 404 405 /* Refer to svc_setup_socket() for details. */ 406 rmb(); 407 svsk->sk_owspace(sk); 408 svc_xprt_enqueue(&svsk->sk_xprt); 409 } 410 } 411 412 static int svc_tcp_has_wspace(struct svc_xprt *xprt) 413 { 414 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 415 416 if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) 417 return 1; 418 return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 419 } 420 421 static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt) 422 { 423 struct svc_sock *svsk; 424 struct socket *sock; 425 struct linger no_linger = { 426 .l_onoff = 1, 427 .l_linger = 0, 428 }; 429 430 svsk = container_of(xprt, struct svc_sock, sk_xprt); 431 sock = svsk->sk_sock; 432 kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER, 433 (char *)&no_linger, sizeof(no_linger)); 434 } 435 436 /* 437 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo 438 */ 439 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, 440 struct cmsghdr *cmh) 441 { 442 struct in_pktinfo *pki = CMSG_DATA(cmh); 443 struct sockaddr_in *daddr = svc_daddr_in(rqstp); 444 445 if (cmh->cmsg_type != IP_PKTINFO) 446 return 0; 447 448 daddr->sin_family = AF_INET; 449 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; 450 return 1; 451 } 452 453 /* 454 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl 455 */ 456 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, 457 struct cmsghdr *cmh) 458 { 459 struct in6_pktinfo *pki = CMSG_DATA(cmh); 460 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); 461 462 if (cmh->cmsg_type != IPV6_PKTINFO) 463 return 0; 464 465 daddr->sin6_family = AF_INET6; 466 daddr->sin6_addr = pki->ipi6_addr; 467 daddr->sin6_scope_id = pki->ipi6_ifindex; 468 return 1; 469 } 470 471 /* 472 * Copy the UDP datagram's destination address to the rqstp structure. 473 * The 'destination' address in this case is the address to which the 474 * peer sent the datagram, i.e. our local address. For multihomed 475 * hosts, this can change from msg to msg. Note that only the IP 476 * address changes, the port number should remain the same. 477 */ 478 static int svc_udp_get_dest_address(struct svc_rqst *rqstp, 479 struct cmsghdr *cmh) 480 { 481 switch (cmh->cmsg_level) { 482 case SOL_IP: 483 return svc_udp_get_dest_address4(rqstp, cmh); 484 case SOL_IPV6: 485 return svc_udp_get_dest_address6(rqstp, cmh); 486 } 487 488 return 0; 489 } 490 491 /* 492 * Receive a datagram from a UDP socket. 493 */ 494 static int svc_udp_recvfrom(struct svc_rqst *rqstp) 495 { 496 struct svc_sock *svsk = 497 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 498 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 499 struct sk_buff *skb; 500 union { 501 struct cmsghdr hdr; 502 long all[SVC_PKTINFO_SPACE / sizeof(long)]; 503 } buffer; 504 struct cmsghdr *cmh = &buffer.hdr; 505 struct msghdr msg = { 506 .msg_name = svc_addr(rqstp), 507 .msg_control = cmh, 508 .msg_controllen = sizeof(buffer), 509 .msg_flags = MSG_DONTWAIT, 510 }; 511 size_t len; 512 int err; 513 514 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) 515 /* udp sockets need large rcvbuf as all pending 516 * requests are still in that buffer. sndbuf must 517 * also be large enough that there is enough space 518 * for one reply per thread. We count all threads 519 * rather than threads in a particular pool, which 520 * provides an upper bound on the number of threads 521 * which will access the socket. 522 */ 523 svc_sock_setbufsize(svsk, serv->sv_nrthreads + 3); 524 525 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 526 skb = NULL; 527 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, 528 0, 0, MSG_PEEK | MSG_DONTWAIT); 529 if (err >= 0) 530 skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err); 531 532 if (skb == NULL) { 533 if (err != -EAGAIN) { 534 /* possibly an icmp error */ 535 dprintk("svc: recvfrom returned error %d\n", -err); 536 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 537 } 538 return 0; 539 } 540 len = svc_addr_len(svc_addr(rqstp)); 541 rqstp->rq_addrlen = len; 542 if (skb->tstamp == 0) { 543 skb->tstamp = ktime_get_real(); 544 /* Don't enable netstamp, sunrpc doesn't 545 need that much accuracy */ 546 } 547 sock_write_timestamp(svsk->sk_sk, skb->tstamp); 548 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ 549 550 len = skb->len; 551 rqstp->rq_arg.len = len; 552 553 rqstp->rq_prot = IPPROTO_UDP; 554 555 if (!svc_udp_get_dest_address(rqstp, cmh)) { 556 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", 557 cmh->cmsg_level, cmh->cmsg_type); 558 goto out_free; 559 } 560 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); 561 562 if (skb_is_nonlinear(skb)) { 563 /* we have to copy */ 564 local_bh_disable(); 565 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { 566 local_bh_enable(); 567 /* checksum error */ 568 goto out_free; 569 } 570 local_bh_enable(); 571 consume_skb(skb); 572 } else { 573 /* we can use it in-place */ 574 rqstp->rq_arg.head[0].iov_base = skb->data; 575 rqstp->rq_arg.head[0].iov_len = len; 576 if (skb_checksum_complete(skb)) 577 goto out_free; 578 rqstp->rq_xprt_ctxt = skb; 579 } 580 581 rqstp->rq_arg.page_base = 0; 582 if (len <= rqstp->rq_arg.head[0].iov_len) { 583 rqstp->rq_arg.head[0].iov_len = len; 584 rqstp->rq_arg.page_len = 0; 585 rqstp->rq_respages = rqstp->rq_pages+1; 586 } else { 587 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; 588 rqstp->rq_respages = rqstp->rq_pages + 1 + 589 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); 590 } 591 rqstp->rq_next_page = rqstp->rq_respages+1; 592 593 if (serv->sv_stats) 594 serv->sv_stats->netudpcnt++; 595 596 return len; 597 out_free: 598 kfree_skb(skb); 599 return 0; 600 } 601 602 static int 603 svc_udp_sendto(struct svc_rqst *rqstp) 604 { 605 int error; 606 607 error = svc_sendto(rqstp, &rqstp->rq_res); 608 if (error == -ECONNREFUSED) 609 /* ICMP error on earlier request. */ 610 error = svc_sendto(rqstp, &rqstp->rq_res); 611 612 return error; 613 } 614 615 static int svc_udp_has_wspace(struct svc_xprt *xprt) 616 { 617 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 618 struct svc_serv *serv = xprt->xpt_server; 619 unsigned long required; 620 621 /* 622 * Set the SOCK_NOSPACE flag before checking the available 623 * sock space. 624 */ 625 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 626 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; 627 if (required*2 > sock_wspace(svsk->sk_sk)) 628 return 0; 629 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 630 return 1; 631 } 632 633 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) 634 { 635 BUG(); 636 return NULL; 637 } 638 639 static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt) 640 { 641 } 642 643 static struct svc_xprt *svc_udp_create(struct svc_serv *serv, 644 struct net *net, 645 struct sockaddr *sa, int salen, 646 int flags) 647 { 648 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); 649 } 650 651 static const struct svc_xprt_ops svc_udp_ops = { 652 .xpo_create = svc_udp_create, 653 .xpo_recvfrom = svc_udp_recvfrom, 654 .xpo_sendto = svc_udp_sendto, 655 .xpo_release_rqst = svc_release_udp_skb, 656 .xpo_detach = svc_sock_detach, 657 .xpo_free = svc_sock_free, 658 .xpo_has_wspace = svc_udp_has_wspace, 659 .xpo_accept = svc_udp_accept, 660 .xpo_secure_port = svc_sock_secure_port, 661 .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt, 662 }; 663 664 static struct svc_xprt_class svc_udp_class = { 665 .xcl_name = "udp", 666 .xcl_owner = THIS_MODULE, 667 .xcl_ops = &svc_udp_ops, 668 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, 669 .xcl_ident = XPRT_TRANSPORT_UDP, 670 }; 671 672 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) 673 { 674 int err, level, optname, one = 1; 675 676 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, 677 &svsk->sk_xprt, serv); 678 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); 679 svsk->sk_sk->sk_data_ready = svc_data_ready; 680 svsk->sk_sk->sk_write_space = svc_write_space; 681 682 /* initialise setting must have enough space to 683 * receive and respond to one request. 684 * svc_udp_recvfrom will re-adjust if necessary 685 */ 686 svc_sock_setbufsize(svsk, 3); 687 688 /* data might have come in before data_ready set up */ 689 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 690 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); 691 692 /* make sure we get destination address info */ 693 switch (svsk->sk_sk->sk_family) { 694 case AF_INET: 695 level = SOL_IP; 696 optname = IP_PKTINFO; 697 break; 698 case AF_INET6: 699 level = SOL_IPV6; 700 optname = IPV6_RECVPKTINFO; 701 break; 702 default: 703 BUG(); 704 } 705 err = kernel_setsockopt(svsk->sk_sock, level, optname, 706 (char *)&one, sizeof(one)); 707 dprintk("svc: kernel_setsockopt returned %d\n", err); 708 } 709 710 /* 711 * A data_ready event on a listening socket means there's a connection 712 * pending. Do not use state_change as a substitute for it. 713 */ 714 static void svc_tcp_listen_data_ready(struct sock *sk) 715 { 716 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 717 718 dprintk("svc: socket %p TCP (listen) state change %d\n", 719 sk, sk->sk_state); 720 721 if (svsk) { 722 /* Refer to svc_setup_socket() for details. */ 723 rmb(); 724 svsk->sk_odata(sk); 725 } 726 727 /* 728 * This callback may called twice when a new connection 729 * is established as a child socket inherits everything 730 * from a parent LISTEN socket. 731 * 1) data_ready method of the parent socket will be called 732 * when one of child sockets become ESTABLISHED. 733 * 2) data_ready method of the child socket may be called 734 * when it receives data before the socket is accepted. 735 * In case of 2, we should ignore it silently. 736 */ 737 if (sk->sk_state == TCP_LISTEN) { 738 if (svsk) { 739 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 740 svc_xprt_enqueue(&svsk->sk_xprt); 741 } else 742 printk("svc: socket %p: no user data\n", sk); 743 } 744 } 745 746 /* 747 * A state change on a connected socket means it's dying or dead. 748 */ 749 static void svc_tcp_state_change(struct sock *sk) 750 { 751 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 752 753 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", 754 sk, sk->sk_state, sk->sk_user_data); 755 756 if (!svsk) 757 printk("svc: socket %p: no user data\n", sk); 758 else { 759 /* Refer to svc_setup_socket() for details. */ 760 rmb(); 761 svsk->sk_ostate(sk); 762 if (sk->sk_state != TCP_ESTABLISHED) { 763 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 764 svc_xprt_enqueue(&svsk->sk_xprt); 765 } 766 } 767 } 768 769 /* 770 * Accept a TCP connection 771 */ 772 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) 773 { 774 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 775 struct sockaddr_storage addr; 776 struct sockaddr *sin = (struct sockaddr *) &addr; 777 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 778 struct socket *sock = svsk->sk_sock; 779 struct socket *newsock; 780 struct svc_sock *newsvsk; 781 int err, slen; 782 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 783 784 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); 785 if (!sock) 786 return NULL; 787 788 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 789 err = kernel_accept(sock, &newsock, O_NONBLOCK); 790 if (err < 0) { 791 if (err == -ENOMEM) 792 printk(KERN_WARNING "%s: no more sockets!\n", 793 serv->sv_name); 794 else if (err != -EAGAIN) 795 net_warn_ratelimited("%s: accept failed (err %d)!\n", 796 serv->sv_name, -err); 797 return NULL; 798 } 799 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 800 801 err = kernel_getpeername(newsock, sin); 802 if (err < 0) { 803 net_warn_ratelimited("%s: peername failed (err %d)!\n", 804 serv->sv_name, -err); 805 goto failed; /* aborted connection or whatever */ 806 } 807 slen = err; 808 809 /* Ideally, we would want to reject connections from unauthorized 810 * hosts here, but when we get encryption, the IP of the host won't 811 * tell us anything. For now just warn about unpriv connections. 812 */ 813 if (!svc_port_is_privileged(sin)) { 814 dprintk("%s: connect from unprivileged port: %s\n", 815 serv->sv_name, 816 __svc_print_addr(sin, buf, sizeof(buf))); 817 } 818 dprintk("%s: connect from %s\n", serv->sv_name, 819 __svc_print_addr(sin, buf, sizeof(buf))); 820 821 /* Reset the inherited callbacks before calling svc_setup_socket */ 822 newsock->sk->sk_state_change = svsk->sk_ostate; 823 newsock->sk->sk_data_ready = svsk->sk_odata; 824 newsock->sk->sk_write_space = svsk->sk_owspace; 825 826 /* make sure that a write doesn't block forever when 827 * low on memory 828 */ 829 newsock->sk->sk_sndtimeo = HZ*30; 830 831 newsvsk = svc_setup_socket(serv, newsock, 832 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); 833 if (IS_ERR(newsvsk)) 834 goto failed; 835 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); 836 err = kernel_getsockname(newsock, sin); 837 slen = err; 838 if (unlikely(err < 0)) { 839 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); 840 slen = offsetof(struct sockaddr, sa_data); 841 } 842 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); 843 844 if (sock_is_loopback(newsock->sk)) 845 set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); 846 else 847 clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); 848 if (serv->sv_stats) 849 serv->sv_stats->nettcpconn++; 850 851 return &newsvsk->sk_xprt; 852 853 failed: 854 sock_release(newsock); 855 return NULL; 856 } 857 858 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) 859 { 860 unsigned int i, len, npages; 861 862 if (svsk->sk_datalen == 0) 863 return 0; 864 len = svsk->sk_datalen; 865 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 866 for (i = 0; i < npages; i++) { 867 if (rqstp->rq_pages[i] != NULL) 868 put_page(rqstp->rq_pages[i]); 869 BUG_ON(svsk->sk_pages[i] == NULL); 870 rqstp->rq_pages[i] = svsk->sk_pages[i]; 871 svsk->sk_pages[i] = NULL; 872 } 873 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); 874 return len; 875 } 876 877 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) 878 { 879 unsigned int i, len, npages; 880 881 if (svsk->sk_datalen == 0) 882 return; 883 len = svsk->sk_datalen; 884 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 885 for (i = 0; i < npages; i++) { 886 svsk->sk_pages[i] = rqstp->rq_pages[i]; 887 rqstp->rq_pages[i] = NULL; 888 } 889 } 890 891 static void svc_tcp_clear_pages(struct svc_sock *svsk) 892 { 893 unsigned int i, len, npages; 894 895 if (svsk->sk_datalen == 0) 896 goto out; 897 len = svsk->sk_datalen; 898 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 899 for (i = 0; i < npages; i++) { 900 if (svsk->sk_pages[i] == NULL) { 901 WARN_ON_ONCE(1); 902 continue; 903 } 904 put_page(svsk->sk_pages[i]); 905 svsk->sk_pages[i] = NULL; 906 } 907 out: 908 svsk->sk_tcplen = 0; 909 svsk->sk_datalen = 0; 910 } 911 912 /* 913 * Receive fragment record header. 914 * If we haven't gotten the record length yet, get the next four bytes. 915 */ 916 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) 917 { 918 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 919 unsigned int want; 920 int len; 921 922 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { 923 struct kvec iov; 924 925 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; 926 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; 927 iov.iov_len = want; 928 len = svc_recvfrom(rqstp, &iov, 1, want, 0); 929 if (len < 0) 930 goto error; 931 svsk->sk_tcplen += len; 932 933 if (len < want) { 934 dprintk("svc: short recvfrom while reading record " 935 "length (%d of %d)\n", len, want); 936 return -EAGAIN; 937 } 938 939 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk)); 940 if (svc_sock_reclen(svsk) + svsk->sk_datalen > 941 serv->sv_max_mesg) { 942 net_notice_ratelimited("RPC: fragment too large: %d\n", 943 svc_sock_reclen(svsk)); 944 goto err_delete; 945 } 946 } 947 948 return svc_sock_reclen(svsk); 949 error: 950 dprintk("RPC: TCP recv_record got %d\n", len); 951 return len; 952 err_delete: 953 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 954 return -EAGAIN; 955 } 956 957 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) 958 { 959 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; 960 struct rpc_rqst *req = NULL; 961 struct kvec *src, *dst; 962 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; 963 __be32 xid; 964 __be32 calldir; 965 966 xid = *p++; 967 calldir = *p; 968 969 if (!bc_xprt) 970 return -EAGAIN; 971 spin_lock(&bc_xprt->queue_lock); 972 req = xprt_lookup_rqst(bc_xprt, xid); 973 if (!req) 974 goto unlock_notfound; 975 976 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); 977 /* 978 * XXX!: cheating for now! Only copying HEAD. 979 * But we know this is good enough for now (in fact, for any 980 * callback reply in the forseeable future). 981 */ 982 dst = &req->rq_private_buf.head[0]; 983 src = &rqstp->rq_arg.head[0]; 984 if (dst->iov_len < src->iov_len) 985 goto unlock_eagain; /* whatever; just giving up. */ 986 memcpy(dst->iov_base, src->iov_base, src->iov_len); 987 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); 988 rqstp->rq_arg.len = 0; 989 spin_unlock(&bc_xprt->queue_lock); 990 return 0; 991 unlock_notfound: 992 printk(KERN_NOTICE 993 "%s: Got unrecognized reply: " 994 "calldir 0x%x xpt_bc_xprt %p xid %08x\n", 995 __func__, ntohl(calldir), 996 bc_xprt, ntohl(xid)); 997 unlock_eagain: 998 spin_unlock(&bc_xprt->queue_lock); 999 return -EAGAIN; 1000 } 1001 1002 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) 1003 { 1004 int i = 0; 1005 int t = 0; 1006 1007 while (t < len) { 1008 vec[i].iov_base = page_address(pages[i]); 1009 vec[i].iov_len = PAGE_SIZE; 1010 i++; 1011 t += PAGE_SIZE; 1012 } 1013 return i; 1014 } 1015 1016 static void svc_tcp_fragment_received(struct svc_sock *svsk) 1017 { 1018 /* If we have more data, signal svc_xprt_enqueue() to try again */ 1019 dprintk("svc: TCP %s record (%d bytes)\n", 1020 svc_sock_final_rec(svsk) ? "final" : "nonfinal", 1021 svc_sock_reclen(svsk)); 1022 svsk->sk_tcplen = 0; 1023 svsk->sk_reclen = 0; 1024 } 1025 1026 /* 1027 * Receive data from a TCP socket. 1028 */ 1029 static int svc_tcp_recvfrom(struct svc_rqst *rqstp) 1030 { 1031 struct svc_sock *svsk = 1032 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 1033 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 1034 int len; 1035 struct kvec *vec; 1036 unsigned int want, base; 1037 __be32 *p; 1038 __be32 calldir; 1039 int pnum; 1040 1041 dprintk("svc: tcp_recv %p data %d conn %d close %d\n", 1042 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), 1043 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), 1044 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); 1045 1046 len = svc_tcp_recv_record(svsk, rqstp); 1047 if (len < 0) 1048 goto error; 1049 1050 base = svc_tcp_restore_pages(svsk, rqstp); 1051 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); 1052 1053 vec = rqstp->rq_vec; 1054 1055 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], base + want); 1056 1057 rqstp->rq_respages = &rqstp->rq_pages[pnum]; 1058 rqstp->rq_next_page = rqstp->rq_respages + 1; 1059 1060 /* Now receive data */ 1061 len = svc_recvfrom(rqstp, vec, pnum, base + want, base); 1062 if (len >= 0) { 1063 svsk->sk_tcplen += len; 1064 svsk->sk_datalen += len; 1065 } 1066 if (len != want || !svc_sock_final_rec(svsk)) { 1067 svc_tcp_save_pages(svsk, rqstp); 1068 if (len < 0 && len != -EAGAIN) 1069 goto err_delete; 1070 if (len == want) 1071 svc_tcp_fragment_received(svsk); 1072 else 1073 dprintk("svc: incomplete TCP record (%d of %d)\n", 1074 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)), 1075 svc_sock_reclen(svsk)); 1076 goto err_noclose; 1077 } 1078 1079 if (svsk->sk_datalen < 8) { 1080 svsk->sk_datalen = 0; 1081 goto err_delete; /* client is nuts. */ 1082 } 1083 1084 rqstp->rq_arg.len = svsk->sk_datalen; 1085 rqstp->rq_arg.page_base = 0; 1086 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { 1087 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; 1088 rqstp->rq_arg.page_len = 0; 1089 } else 1090 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; 1091 1092 rqstp->rq_xprt_ctxt = NULL; 1093 rqstp->rq_prot = IPPROTO_TCP; 1094 if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags)) 1095 set_bit(RQ_LOCAL, &rqstp->rq_flags); 1096 else 1097 clear_bit(RQ_LOCAL, &rqstp->rq_flags); 1098 1099 p = (__be32 *)rqstp->rq_arg.head[0].iov_base; 1100 calldir = p[1]; 1101 if (calldir) 1102 len = receive_cb_reply(svsk, rqstp); 1103 1104 /* Reset TCP read info */ 1105 svsk->sk_datalen = 0; 1106 svc_tcp_fragment_received(svsk); 1107 1108 if (len < 0) 1109 goto error; 1110 1111 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); 1112 if (serv->sv_stats) 1113 serv->sv_stats->nettcpcnt++; 1114 1115 return rqstp->rq_arg.len; 1116 1117 error: 1118 if (len != -EAGAIN) 1119 goto err_delete; 1120 dprintk("RPC: TCP recvfrom got EAGAIN\n"); 1121 return 0; 1122 err_delete: 1123 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", 1124 svsk->sk_xprt.xpt_server->sv_name, -len); 1125 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1126 err_noclose: 1127 return 0; /* record not complete */ 1128 } 1129 1130 /* 1131 * Send out data on TCP socket. 1132 */ 1133 static int svc_tcp_sendto(struct svc_rqst *rqstp) 1134 { 1135 struct xdr_buf *xbufp = &rqstp->rq_res; 1136 int sent; 1137 __be32 reclen; 1138 1139 /* Set up the first element of the reply kvec. 1140 * Any other kvecs that may be in use have been taken 1141 * care of by the server implementation itself. 1142 */ 1143 reclen = htonl(0x80000000|((xbufp->len ) - 4)); 1144 memcpy(xbufp->head[0].iov_base, &reclen, 4); 1145 1146 sent = svc_sendto(rqstp, &rqstp->rq_res); 1147 if (sent != xbufp->len) { 1148 printk(KERN_NOTICE 1149 "rpc-srv/tcp: %s: %s %d when sending %d bytes " 1150 "- shutting down socket\n", 1151 rqstp->rq_xprt->xpt_server->sv_name, 1152 (sent<0)?"got error":"sent only", 1153 sent, xbufp->len); 1154 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); 1155 svc_xprt_enqueue(rqstp->rq_xprt); 1156 sent = -EAGAIN; 1157 } 1158 return sent; 1159 } 1160 1161 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, 1162 struct net *net, 1163 struct sockaddr *sa, int salen, 1164 int flags) 1165 { 1166 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); 1167 } 1168 1169 static const struct svc_xprt_ops svc_tcp_ops = { 1170 .xpo_create = svc_tcp_create, 1171 .xpo_recvfrom = svc_tcp_recvfrom, 1172 .xpo_sendto = svc_tcp_sendto, 1173 .xpo_release_rqst = svc_release_skb, 1174 .xpo_detach = svc_tcp_sock_detach, 1175 .xpo_free = svc_sock_free, 1176 .xpo_has_wspace = svc_tcp_has_wspace, 1177 .xpo_accept = svc_tcp_accept, 1178 .xpo_secure_port = svc_sock_secure_port, 1179 .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt, 1180 }; 1181 1182 static struct svc_xprt_class svc_tcp_class = { 1183 .xcl_name = "tcp", 1184 .xcl_owner = THIS_MODULE, 1185 .xcl_ops = &svc_tcp_ops, 1186 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, 1187 .xcl_ident = XPRT_TRANSPORT_TCP, 1188 }; 1189 1190 void svc_init_xprt_sock(void) 1191 { 1192 svc_reg_xprt_class(&svc_tcp_class); 1193 svc_reg_xprt_class(&svc_udp_class); 1194 } 1195 1196 void svc_cleanup_xprt_sock(void) 1197 { 1198 svc_unreg_xprt_class(&svc_tcp_class); 1199 svc_unreg_xprt_class(&svc_udp_class); 1200 } 1201 1202 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) 1203 { 1204 struct sock *sk = svsk->sk_sk; 1205 1206 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, 1207 &svsk->sk_xprt, serv); 1208 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); 1209 set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags); 1210 if (sk->sk_state == TCP_LISTEN) { 1211 dprintk("setting up TCP socket for listening\n"); 1212 strcpy(svsk->sk_xprt.xpt_remotebuf, "listener"); 1213 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); 1214 sk->sk_data_ready = svc_tcp_listen_data_ready; 1215 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 1216 } else { 1217 dprintk("setting up TCP socket for reading\n"); 1218 sk->sk_state_change = svc_tcp_state_change; 1219 sk->sk_data_ready = svc_data_ready; 1220 sk->sk_write_space = svc_write_space; 1221 1222 svsk->sk_reclen = 0; 1223 svsk->sk_tcplen = 0; 1224 svsk->sk_datalen = 0; 1225 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); 1226 1227 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1228 1229 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 1230 switch (sk->sk_state) { 1231 case TCP_SYN_RECV: 1232 case TCP_ESTABLISHED: 1233 break; 1234 default: 1235 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1236 } 1237 } 1238 } 1239 1240 void svc_sock_update_bufs(struct svc_serv *serv) 1241 { 1242 /* 1243 * The number of server threads has changed. Update 1244 * rcvbuf and sndbuf accordingly on all sockets 1245 */ 1246 struct svc_sock *svsk; 1247 1248 spin_lock_bh(&serv->sv_lock); 1249 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) 1250 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); 1251 spin_unlock_bh(&serv->sv_lock); 1252 } 1253 EXPORT_SYMBOL_GPL(svc_sock_update_bufs); 1254 1255 /* 1256 * Initialize socket for RPC use and create svc_sock struct 1257 */ 1258 static struct svc_sock *svc_setup_socket(struct svc_serv *serv, 1259 struct socket *sock, 1260 int flags) 1261 { 1262 struct svc_sock *svsk; 1263 struct sock *inet; 1264 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); 1265 int err = 0; 1266 1267 dprintk("svc: svc_setup_socket %p\n", sock); 1268 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); 1269 if (!svsk) 1270 return ERR_PTR(-ENOMEM); 1271 1272 inet = sock->sk; 1273 1274 /* Register socket with portmapper */ 1275 if (pmap_register) 1276 err = svc_register(serv, sock_net(sock->sk), inet->sk_family, 1277 inet->sk_protocol, 1278 ntohs(inet_sk(inet)->inet_sport)); 1279 1280 if (err < 0) { 1281 kfree(svsk); 1282 return ERR_PTR(err); 1283 } 1284 1285 svsk->sk_sock = sock; 1286 svsk->sk_sk = inet; 1287 svsk->sk_ostate = inet->sk_state_change; 1288 svsk->sk_odata = inet->sk_data_ready; 1289 svsk->sk_owspace = inet->sk_write_space; 1290 /* 1291 * This barrier is necessary in order to prevent race condition 1292 * with svc_data_ready(), svc_listen_data_ready() and others 1293 * when calling callbacks above. 1294 */ 1295 wmb(); 1296 inet->sk_user_data = svsk; 1297 1298 /* Initialize the socket */ 1299 if (sock->type == SOCK_DGRAM) 1300 svc_udp_init(svsk, serv); 1301 else 1302 svc_tcp_init(svsk, serv); 1303 1304 dprintk("svc: svc_setup_socket created %p (inet %p), " 1305 "listen %d close %d\n", 1306 svsk, svsk->sk_sk, 1307 test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags), 1308 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); 1309 1310 return svsk; 1311 } 1312 1313 bool svc_alien_sock(struct net *net, int fd) 1314 { 1315 int err; 1316 struct socket *sock = sockfd_lookup(fd, &err); 1317 bool ret = false; 1318 1319 if (!sock) 1320 goto out; 1321 if (sock_net(sock->sk) != net) 1322 ret = true; 1323 sockfd_put(sock); 1324 out: 1325 return ret; 1326 } 1327 EXPORT_SYMBOL_GPL(svc_alien_sock); 1328 1329 /** 1330 * svc_addsock - add a listener socket to an RPC service 1331 * @serv: pointer to RPC service to which to add a new listener 1332 * @fd: file descriptor of the new listener 1333 * @name_return: pointer to buffer to fill in with name of listener 1334 * @len: size of the buffer 1335 * @cred: credential 1336 * 1337 * Fills in socket name and returns positive length of name if successful. 1338 * Name is terminated with '\n'. On error, returns a negative errno 1339 * value. 1340 */ 1341 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, 1342 const size_t len, const struct cred *cred) 1343 { 1344 int err = 0; 1345 struct socket *so = sockfd_lookup(fd, &err); 1346 struct svc_sock *svsk = NULL; 1347 struct sockaddr_storage addr; 1348 struct sockaddr *sin = (struct sockaddr *)&addr; 1349 int salen; 1350 1351 if (!so) 1352 return err; 1353 err = -EAFNOSUPPORT; 1354 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) 1355 goto out; 1356 err = -EPROTONOSUPPORT; 1357 if (so->sk->sk_protocol != IPPROTO_TCP && 1358 so->sk->sk_protocol != IPPROTO_UDP) 1359 goto out; 1360 err = -EISCONN; 1361 if (so->state > SS_UNCONNECTED) 1362 goto out; 1363 err = -ENOENT; 1364 if (!try_module_get(THIS_MODULE)) 1365 goto out; 1366 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); 1367 if (IS_ERR(svsk)) { 1368 module_put(THIS_MODULE); 1369 err = PTR_ERR(svsk); 1370 goto out; 1371 } 1372 salen = kernel_getsockname(svsk->sk_sock, sin); 1373 if (salen >= 0) 1374 svc_xprt_set_local(&svsk->sk_xprt, sin, salen); 1375 svsk->sk_xprt.xpt_cred = get_cred(cred); 1376 svc_add_new_perm_xprt(serv, &svsk->sk_xprt); 1377 return svc_one_sock_name(svsk, name_return, len); 1378 out: 1379 sockfd_put(so); 1380 return err; 1381 } 1382 EXPORT_SYMBOL_GPL(svc_addsock); 1383 1384 /* 1385 * Create socket for RPC service. 1386 */ 1387 static struct svc_xprt *svc_create_socket(struct svc_serv *serv, 1388 int protocol, 1389 struct net *net, 1390 struct sockaddr *sin, int len, 1391 int flags) 1392 { 1393 struct svc_sock *svsk; 1394 struct socket *sock; 1395 int error; 1396 int type; 1397 struct sockaddr_storage addr; 1398 struct sockaddr *newsin = (struct sockaddr *)&addr; 1399 int newlen; 1400 int family; 1401 int val; 1402 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 1403 1404 dprintk("svc: svc_create_socket(%s, %d, %s)\n", 1405 serv->sv_program->pg_name, protocol, 1406 __svc_print_addr(sin, buf, sizeof(buf))); 1407 1408 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { 1409 printk(KERN_WARNING "svc: only UDP and TCP " 1410 "sockets supported\n"); 1411 return ERR_PTR(-EINVAL); 1412 } 1413 1414 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; 1415 switch (sin->sa_family) { 1416 case AF_INET6: 1417 family = PF_INET6; 1418 break; 1419 case AF_INET: 1420 family = PF_INET; 1421 break; 1422 default: 1423 return ERR_PTR(-EINVAL); 1424 } 1425 1426 error = __sock_create(net, family, type, protocol, &sock, 1); 1427 if (error < 0) 1428 return ERR_PTR(error); 1429 1430 svc_reclassify_socket(sock); 1431 1432 /* 1433 * If this is an PF_INET6 listener, we want to avoid 1434 * getting requests from IPv4 remotes. Those should 1435 * be shunted to a PF_INET listener via rpcbind. 1436 */ 1437 val = 1; 1438 if (family == PF_INET6) 1439 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, 1440 (char *)&val, sizeof(val)); 1441 1442 if (type == SOCK_STREAM) 1443 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ 1444 error = kernel_bind(sock, sin, len); 1445 if (error < 0) 1446 goto bummer; 1447 1448 error = kernel_getsockname(sock, newsin); 1449 if (error < 0) 1450 goto bummer; 1451 newlen = error; 1452 1453 if (protocol == IPPROTO_TCP) { 1454 if ((error = kernel_listen(sock, 64)) < 0) 1455 goto bummer; 1456 } 1457 1458 svsk = svc_setup_socket(serv, sock, flags); 1459 if (IS_ERR(svsk)) { 1460 error = PTR_ERR(svsk); 1461 goto bummer; 1462 } 1463 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); 1464 return (struct svc_xprt *)svsk; 1465 bummer: 1466 dprintk("svc: svc_create_socket error = %d\n", -error); 1467 sock_release(sock); 1468 return ERR_PTR(error); 1469 } 1470 1471 /* 1472 * Detach the svc_sock from the socket so that no 1473 * more callbacks occur. 1474 */ 1475 static void svc_sock_detach(struct svc_xprt *xprt) 1476 { 1477 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1478 struct sock *sk = svsk->sk_sk; 1479 1480 dprintk("svc: svc_sock_detach(%p)\n", svsk); 1481 1482 /* put back the old socket callbacks */ 1483 lock_sock(sk); 1484 sk->sk_state_change = svsk->sk_ostate; 1485 sk->sk_data_ready = svsk->sk_odata; 1486 sk->sk_write_space = svsk->sk_owspace; 1487 sk->sk_user_data = NULL; 1488 release_sock(sk); 1489 } 1490 1491 /* 1492 * Disconnect the socket, and reset the callbacks 1493 */ 1494 static void svc_tcp_sock_detach(struct svc_xprt *xprt) 1495 { 1496 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1497 1498 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); 1499 1500 svc_sock_detach(xprt); 1501 1502 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { 1503 svc_tcp_clear_pages(svsk); 1504 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); 1505 } 1506 } 1507 1508 /* 1509 * Free the svc_sock's socket resources and the svc_sock itself. 1510 */ 1511 static void svc_sock_free(struct svc_xprt *xprt) 1512 { 1513 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1514 dprintk("svc: svc_sock_free(%p)\n", svsk); 1515 1516 if (svsk->sk_sock->file) 1517 sockfd_put(svsk->sk_sock); 1518 else 1519 sock_release(svsk->sk_sock); 1520 kfree(svsk); 1521 } 1522