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 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, iov, nr, buflen); 342 len = sock_recvmsg(svsk->sk_sock, &msg, 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 lock_sock(sock->sk); 388 sock->sk->sk_sndbuf = snd * 2; 389 sock->sk->sk_rcvbuf = rcv * 2; 390 sock->sk->sk_write_space(sock->sk); 391 release_sock(sock->sk); 392 } 393 394 static int svc_sock_secure_port(struct svc_rqst *rqstp) 395 { 396 return svc_port_is_privileged(svc_addr(rqstp)); 397 } 398 399 /* 400 * INET callback when data has been received on the socket. 401 */ 402 static void svc_data_ready(struct sock *sk) 403 { 404 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 405 406 if (svsk) { 407 dprintk("svc: socket %p(inet %p), busy=%d\n", 408 svsk, sk, 409 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); 410 411 /* Refer to svc_setup_socket() for details. */ 412 rmb(); 413 svsk->sk_odata(sk); 414 if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags)) 415 svc_xprt_enqueue(&svsk->sk_xprt); 416 } 417 } 418 419 /* 420 * INET callback when space is newly available on the socket. 421 */ 422 static void svc_write_space(struct sock *sk) 423 { 424 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); 425 426 if (svsk) { 427 dprintk("svc: socket %p(inet %p), write_space busy=%d\n", 428 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); 429 430 /* Refer to svc_setup_socket() for details. */ 431 rmb(); 432 svsk->sk_owspace(sk); 433 svc_xprt_enqueue(&svsk->sk_xprt); 434 } 435 } 436 437 static int svc_tcp_has_wspace(struct svc_xprt *xprt) 438 { 439 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 440 441 if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) 442 return 1; 443 return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 444 } 445 446 static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt) 447 { 448 struct svc_sock *svsk; 449 struct socket *sock; 450 struct linger no_linger = { 451 .l_onoff = 1, 452 .l_linger = 0, 453 }; 454 455 svsk = container_of(xprt, struct svc_sock, sk_xprt); 456 sock = svsk->sk_sock; 457 kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER, 458 (char *)&no_linger, sizeof(no_linger)); 459 } 460 461 /* 462 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo 463 */ 464 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, 465 struct cmsghdr *cmh) 466 { 467 struct in_pktinfo *pki = CMSG_DATA(cmh); 468 struct sockaddr_in *daddr = svc_daddr_in(rqstp); 469 470 if (cmh->cmsg_type != IP_PKTINFO) 471 return 0; 472 473 daddr->sin_family = AF_INET; 474 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; 475 return 1; 476 } 477 478 /* 479 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl 480 */ 481 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, 482 struct cmsghdr *cmh) 483 { 484 struct in6_pktinfo *pki = CMSG_DATA(cmh); 485 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); 486 487 if (cmh->cmsg_type != IPV6_PKTINFO) 488 return 0; 489 490 daddr->sin6_family = AF_INET6; 491 daddr->sin6_addr = pki->ipi6_addr; 492 daddr->sin6_scope_id = pki->ipi6_ifindex; 493 return 1; 494 } 495 496 /* 497 * Copy the UDP datagram's destination address to the rqstp structure. 498 * The 'destination' address in this case is the address to which the 499 * peer sent the datagram, i.e. our local address. For multihomed 500 * hosts, this can change from msg to msg. Note that only the IP 501 * address changes, the port number should remain the same. 502 */ 503 static int svc_udp_get_dest_address(struct svc_rqst *rqstp, 504 struct cmsghdr *cmh) 505 { 506 switch (cmh->cmsg_level) { 507 case SOL_IP: 508 return svc_udp_get_dest_address4(rqstp, cmh); 509 case SOL_IPV6: 510 return svc_udp_get_dest_address6(rqstp, cmh); 511 } 512 513 return 0; 514 } 515 516 /* 517 * Receive a datagram from a UDP socket. 518 */ 519 static int svc_udp_recvfrom(struct svc_rqst *rqstp) 520 { 521 struct svc_sock *svsk = 522 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 523 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 524 struct sk_buff *skb; 525 union { 526 struct cmsghdr hdr; 527 long all[SVC_PKTINFO_SPACE / sizeof(long)]; 528 } buffer; 529 struct cmsghdr *cmh = &buffer.hdr; 530 struct msghdr msg = { 531 .msg_name = svc_addr(rqstp), 532 .msg_control = cmh, 533 .msg_controllen = sizeof(buffer), 534 .msg_flags = MSG_DONTWAIT, 535 }; 536 size_t len; 537 int err; 538 539 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) 540 /* udp sockets need large rcvbuf as all pending 541 * requests are still in that buffer. sndbuf must 542 * also be large enough that there is enough space 543 * for one reply per thread. We count all threads 544 * rather than threads in a particular pool, which 545 * provides an upper bound on the number of threads 546 * which will access the socket. 547 */ 548 svc_sock_setbufsize(svsk->sk_sock, 549 (serv->sv_nrthreads+3) * serv->sv_max_mesg, 550 (serv->sv_nrthreads+3) * serv->sv_max_mesg); 551 552 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 553 skb = NULL; 554 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, 555 0, 0, MSG_PEEK | MSG_DONTWAIT); 556 if (err >= 0) 557 skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err); 558 559 if (skb == NULL) { 560 if (err != -EAGAIN) { 561 /* possibly an icmp error */ 562 dprintk("svc: recvfrom returned error %d\n", -err); 563 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 564 } 565 return 0; 566 } 567 len = svc_addr_len(svc_addr(rqstp)); 568 rqstp->rq_addrlen = len; 569 if (skb->tstamp == 0) { 570 skb->tstamp = ktime_get_real(); 571 /* Don't enable netstamp, sunrpc doesn't 572 need that much accuracy */ 573 } 574 svsk->sk_sk->sk_stamp = skb->tstamp; 575 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ 576 577 len = skb->len; 578 rqstp->rq_arg.len = len; 579 580 rqstp->rq_prot = IPPROTO_UDP; 581 582 if (!svc_udp_get_dest_address(rqstp, cmh)) { 583 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", 584 cmh->cmsg_level, cmh->cmsg_type); 585 goto out_free; 586 } 587 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); 588 589 if (skb_is_nonlinear(skb)) { 590 /* we have to copy */ 591 local_bh_disable(); 592 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { 593 local_bh_enable(); 594 /* checksum error */ 595 goto out_free; 596 } 597 local_bh_enable(); 598 consume_skb(skb); 599 } else { 600 /* we can use it in-place */ 601 rqstp->rq_arg.head[0].iov_base = skb->data; 602 rqstp->rq_arg.head[0].iov_len = len; 603 if (skb_checksum_complete(skb)) 604 goto out_free; 605 rqstp->rq_xprt_ctxt = skb; 606 } 607 608 rqstp->rq_arg.page_base = 0; 609 if (len <= rqstp->rq_arg.head[0].iov_len) { 610 rqstp->rq_arg.head[0].iov_len = len; 611 rqstp->rq_arg.page_len = 0; 612 rqstp->rq_respages = rqstp->rq_pages+1; 613 } else { 614 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; 615 rqstp->rq_respages = rqstp->rq_pages + 1 + 616 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); 617 } 618 rqstp->rq_next_page = rqstp->rq_respages+1; 619 620 if (serv->sv_stats) 621 serv->sv_stats->netudpcnt++; 622 623 return len; 624 out_free: 625 kfree_skb(skb); 626 return 0; 627 } 628 629 static int 630 svc_udp_sendto(struct svc_rqst *rqstp) 631 { 632 int error; 633 634 error = svc_sendto(rqstp, &rqstp->rq_res); 635 if (error == -ECONNREFUSED) 636 /* ICMP error on earlier request. */ 637 error = svc_sendto(rqstp, &rqstp->rq_res); 638 639 return error; 640 } 641 642 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) 643 { 644 } 645 646 static int svc_udp_has_wspace(struct svc_xprt *xprt) 647 { 648 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 649 struct svc_serv *serv = xprt->xpt_server; 650 unsigned long required; 651 652 /* 653 * Set the SOCK_NOSPACE flag before checking the available 654 * sock space. 655 */ 656 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 657 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; 658 if (required*2 > sock_wspace(svsk->sk_sk)) 659 return 0; 660 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 661 return 1; 662 } 663 664 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) 665 { 666 BUG(); 667 return NULL; 668 } 669 670 static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt) 671 { 672 } 673 674 static struct svc_xprt *svc_udp_create(struct svc_serv *serv, 675 struct net *net, 676 struct sockaddr *sa, int salen, 677 int flags) 678 { 679 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); 680 } 681 682 static const struct svc_xprt_ops svc_udp_ops = { 683 .xpo_create = svc_udp_create, 684 .xpo_recvfrom = svc_udp_recvfrom, 685 .xpo_sendto = svc_udp_sendto, 686 .xpo_release_rqst = svc_release_udp_skb, 687 .xpo_detach = svc_sock_detach, 688 .xpo_free = svc_sock_free, 689 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, 690 .xpo_has_wspace = svc_udp_has_wspace, 691 .xpo_accept = svc_udp_accept, 692 .xpo_secure_port = svc_sock_secure_port, 693 .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt, 694 }; 695 696 static struct svc_xprt_class svc_udp_class = { 697 .xcl_name = "udp", 698 .xcl_owner = THIS_MODULE, 699 .xcl_ops = &svc_udp_ops, 700 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, 701 .xcl_ident = XPRT_TRANSPORT_UDP, 702 }; 703 704 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) 705 { 706 int err, level, optname, one = 1; 707 708 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, 709 &svsk->sk_xprt, serv); 710 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); 711 svsk->sk_sk->sk_data_ready = svc_data_ready; 712 svsk->sk_sk->sk_write_space = svc_write_space; 713 714 /* initialise setting must have enough space to 715 * receive and respond to one request. 716 * svc_udp_recvfrom will re-adjust if necessary 717 */ 718 svc_sock_setbufsize(svsk->sk_sock, 719 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, 720 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); 721 722 /* data might have come in before data_ready set up */ 723 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 724 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); 725 726 /* make sure we get destination address info */ 727 switch (svsk->sk_sk->sk_family) { 728 case AF_INET: 729 level = SOL_IP; 730 optname = IP_PKTINFO; 731 break; 732 case AF_INET6: 733 level = SOL_IPV6; 734 optname = IPV6_RECVPKTINFO; 735 break; 736 default: 737 BUG(); 738 } 739 err = kernel_setsockopt(svsk->sk_sock, level, optname, 740 (char *)&one, sizeof(one)); 741 dprintk("svc: kernel_setsockopt returned %d\n", err); 742 } 743 744 /* 745 * A data_ready event on a listening socket means there's a connection 746 * pending. Do not use state_change as a substitute for it. 747 */ 748 static void svc_tcp_listen_data_ready(struct sock *sk) 749 { 750 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 751 752 dprintk("svc: socket %p TCP (listen) state change %d\n", 753 sk, sk->sk_state); 754 755 if (svsk) { 756 /* Refer to svc_setup_socket() for details. */ 757 rmb(); 758 svsk->sk_odata(sk); 759 } 760 761 /* 762 * This callback may called twice when a new connection 763 * is established as a child socket inherits everything 764 * from a parent LISTEN socket. 765 * 1) data_ready method of the parent socket will be called 766 * when one of child sockets become ESTABLISHED. 767 * 2) data_ready method of the child socket may be called 768 * when it receives data before the socket is accepted. 769 * In case of 2, we should ignore it silently. 770 */ 771 if (sk->sk_state == TCP_LISTEN) { 772 if (svsk) { 773 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 774 svc_xprt_enqueue(&svsk->sk_xprt); 775 } else 776 printk("svc: socket %p: no user data\n", sk); 777 } 778 } 779 780 /* 781 * A state change on a connected socket means it's dying or dead. 782 */ 783 static void svc_tcp_state_change(struct sock *sk) 784 { 785 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 786 787 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", 788 sk, sk->sk_state, sk->sk_user_data); 789 790 if (!svsk) 791 printk("svc: socket %p: no user data\n", sk); 792 else { 793 /* Refer to svc_setup_socket() for details. */ 794 rmb(); 795 svsk->sk_ostate(sk); 796 if (sk->sk_state != TCP_ESTABLISHED) { 797 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 798 svc_xprt_enqueue(&svsk->sk_xprt); 799 } 800 } 801 } 802 803 /* 804 * Accept a TCP connection 805 */ 806 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) 807 { 808 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 809 struct sockaddr_storage addr; 810 struct sockaddr *sin = (struct sockaddr *) &addr; 811 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 812 struct socket *sock = svsk->sk_sock; 813 struct socket *newsock; 814 struct svc_sock *newsvsk; 815 int err, slen; 816 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 817 818 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); 819 if (!sock) 820 return NULL; 821 822 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 823 err = kernel_accept(sock, &newsock, O_NONBLOCK); 824 if (err < 0) { 825 if (err == -ENOMEM) 826 printk(KERN_WARNING "%s: no more sockets!\n", 827 serv->sv_name); 828 else if (err != -EAGAIN) 829 net_warn_ratelimited("%s: accept failed (err %d)!\n", 830 serv->sv_name, -err); 831 return NULL; 832 } 833 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 834 835 err = kernel_getpeername(newsock, sin, &slen); 836 if (err < 0) { 837 net_warn_ratelimited("%s: peername failed (err %d)!\n", 838 serv->sv_name, -err); 839 goto failed; /* aborted connection or whatever */ 840 } 841 842 /* Ideally, we would want to reject connections from unauthorized 843 * hosts here, but when we get encryption, the IP of the host won't 844 * tell us anything. For now just warn about unpriv connections. 845 */ 846 if (!svc_port_is_privileged(sin)) { 847 dprintk("%s: connect from unprivileged port: %s\n", 848 serv->sv_name, 849 __svc_print_addr(sin, buf, sizeof(buf))); 850 } 851 dprintk("%s: connect from %s\n", serv->sv_name, 852 __svc_print_addr(sin, buf, sizeof(buf))); 853 854 /* Reset the inherited callbacks before calling svc_setup_socket */ 855 newsock->sk->sk_state_change = svsk->sk_ostate; 856 newsock->sk->sk_data_ready = svsk->sk_odata; 857 newsock->sk->sk_write_space = svsk->sk_owspace; 858 859 /* make sure that a write doesn't block forever when 860 * low on memory 861 */ 862 newsock->sk->sk_sndtimeo = HZ*30; 863 864 newsvsk = svc_setup_socket(serv, newsock, 865 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); 866 if (IS_ERR(newsvsk)) 867 goto failed; 868 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); 869 err = kernel_getsockname(newsock, sin, &slen); 870 if (unlikely(err < 0)) { 871 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); 872 slen = offsetof(struct sockaddr, sa_data); 873 } 874 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); 875 876 if (sock_is_loopback(newsock->sk)) 877 set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); 878 else 879 clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); 880 if (serv->sv_stats) 881 serv->sv_stats->nettcpconn++; 882 883 return &newsvsk->sk_xprt; 884 885 failed: 886 sock_release(newsock); 887 return NULL; 888 } 889 890 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) 891 { 892 unsigned int i, len, npages; 893 894 if (svsk->sk_datalen == 0) 895 return 0; 896 len = svsk->sk_datalen; 897 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 898 for (i = 0; i < npages; i++) { 899 if (rqstp->rq_pages[i] != NULL) 900 put_page(rqstp->rq_pages[i]); 901 BUG_ON(svsk->sk_pages[i] == NULL); 902 rqstp->rq_pages[i] = svsk->sk_pages[i]; 903 svsk->sk_pages[i] = NULL; 904 } 905 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); 906 return len; 907 } 908 909 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) 910 { 911 unsigned int i, len, npages; 912 913 if (svsk->sk_datalen == 0) 914 return; 915 len = svsk->sk_datalen; 916 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 917 for (i = 0; i < npages; i++) { 918 svsk->sk_pages[i] = rqstp->rq_pages[i]; 919 rqstp->rq_pages[i] = NULL; 920 } 921 } 922 923 static void svc_tcp_clear_pages(struct svc_sock *svsk) 924 { 925 unsigned int i, len, npages; 926 927 if (svsk->sk_datalen == 0) 928 goto out; 929 len = svsk->sk_datalen; 930 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 931 for (i = 0; i < npages; i++) { 932 if (svsk->sk_pages[i] == NULL) { 933 WARN_ON_ONCE(1); 934 continue; 935 } 936 put_page(svsk->sk_pages[i]); 937 svsk->sk_pages[i] = NULL; 938 } 939 out: 940 svsk->sk_tcplen = 0; 941 svsk->sk_datalen = 0; 942 } 943 944 /* 945 * Receive fragment record header. 946 * If we haven't gotten the record length yet, get the next four bytes. 947 */ 948 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) 949 { 950 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 951 unsigned int want; 952 int len; 953 954 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { 955 struct kvec iov; 956 957 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; 958 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; 959 iov.iov_len = want; 960 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) 961 goto error; 962 svsk->sk_tcplen += len; 963 964 if (len < want) { 965 dprintk("svc: short recvfrom while reading record " 966 "length (%d of %d)\n", len, want); 967 return -EAGAIN; 968 } 969 970 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk)); 971 if (svc_sock_reclen(svsk) + svsk->sk_datalen > 972 serv->sv_max_mesg) { 973 net_notice_ratelimited("RPC: fragment too large: %d\n", 974 svc_sock_reclen(svsk)); 975 goto err_delete; 976 } 977 } 978 979 return svc_sock_reclen(svsk); 980 error: 981 dprintk("RPC: TCP recv_record got %d\n", len); 982 return len; 983 err_delete: 984 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 985 return -EAGAIN; 986 } 987 988 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) 989 { 990 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; 991 struct rpc_rqst *req = NULL; 992 struct kvec *src, *dst; 993 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; 994 __be32 xid; 995 __be32 calldir; 996 997 xid = *p++; 998 calldir = *p; 999 1000 if (!bc_xprt) 1001 return -EAGAIN; 1002 spin_lock(&bc_xprt->recv_lock); 1003 req = xprt_lookup_rqst(bc_xprt, xid); 1004 if (!req) 1005 goto unlock_notfound; 1006 1007 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); 1008 /* 1009 * XXX!: cheating for now! Only copying HEAD. 1010 * But we know this is good enough for now (in fact, for any 1011 * callback reply in the forseeable future). 1012 */ 1013 dst = &req->rq_private_buf.head[0]; 1014 src = &rqstp->rq_arg.head[0]; 1015 if (dst->iov_len < src->iov_len) 1016 goto unlock_eagain; /* whatever; just giving up. */ 1017 memcpy(dst->iov_base, src->iov_base, src->iov_len); 1018 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); 1019 rqstp->rq_arg.len = 0; 1020 spin_unlock(&bc_xprt->recv_lock); 1021 return 0; 1022 unlock_notfound: 1023 printk(KERN_NOTICE 1024 "%s: Got unrecognized reply: " 1025 "calldir 0x%x xpt_bc_xprt %p xid %08x\n", 1026 __func__, ntohl(calldir), 1027 bc_xprt, ntohl(xid)); 1028 unlock_eagain: 1029 spin_unlock(&bc_xprt->recv_lock); 1030 return -EAGAIN; 1031 } 1032 1033 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) 1034 { 1035 int i = 0; 1036 int t = 0; 1037 1038 while (t < len) { 1039 vec[i].iov_base = page_address(pages[i]); 1040 vec[i].iov_len = PAGE_SIZE; 1041 i++; 1042 t += PAGE_SIZE; 1043 } 1044 return i; 1045 } 1046 1047 static void svc_tcp_fragment_received(struct svc_sock *svsk) 1048 { 1049 /* If we have more data, signal svc_xprt_enqueue() to try again */ 1050 dprintk("svc: TCP %s record (%d bytes)\n", 1051 svc_sock_final_rec(svsk) ? "final" : "nonfinal", 1052 svc_sock_reclen(svsk)); 1053 svsk->sk_tcplen = 0; 1054 svsk->sk_reclen = 0; 1055 } 1056 1057 /* 1058 * Receive data from a TCP socket. 1059 */ 1060 static int svc_tcp_recvfrom(struct svc_rqst *rqstp) 1061 { 1062 struct svc_sock *svsk = 1063 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 1064 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 1065 int len; 1066 struct kvec *vec; 1067 unsigned int want, base; 1068 __be32 *p; 1069 __be32 calldir; 1070 int pnum; 1071 1072 dprintk("svc: tcp_recv %p data %d conn %d close %d\n", 1073 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), 1074 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), 1075 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); 1076 1077 len = svc_tcp_recv_record(svsk, rqstp); 1078 if (len < 0) 1079 goto error; 1080 1081 base = svc_tcp_restore_pages(svsk, rqstp); 1082 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); 1083 1084 vec = rqstp->rq_vec; 1085 1086 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], 1087 svsk->sk_datalen + want); 1088 1089 rqstp->rq_respages = &rqstp->rq_pages[pnum]; 1090 rqstp->rq_next_page = rqstp->rq_respages + 1; 1091 1092 /* Now receive data */ 1093 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); 1094 if (len >= 0) { 1095 svsk->sk_tcplen += len; 1096 svsk->sk_datalen += len; 1097 } 1098 if (len != want || !svc_sock_final_rec(svsk)) { 1099 svc_tcp_save_pages(svsk, rqstp); 1100 if (len < 0 && len != -EAGAIN) 1101 goto err_delete; 1102 if (len == want) 1103 svc_tcp_fragment_received(svsk); 1104 else 1105 dprintk("svc: incomplete TCP record (%d of %d)\n", 1106 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)), 1107 svc_sock_reclen(svsk)); 1108 goto err_noclose; 1109 } 1110 1111 if (svsk->sk_datalen < 8) { 1112 svsk->sk_datalen = 0; 1113 goto err_delete; /* client is nuts. */ 1114 } 1115 1116 rqstp->rq_arg.len = svsk->sk_datalen; 1117 rqstp->rq_arg.page_base = 0; 1118 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { 1119 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; 1120 rqstp->rq_arg.page_len = 0; 1121 } else 1122 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; 1123 1124 rqstp->rq_xprt_ctxt = NULL; 1125 rqstp->rq_prot = IPPROTO_TCP; 1126 if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags)) 1127 set_bit(RQ_LOCAL, &rqstp->rq_flags); 1128 else 1129 clear_bit(RQ_LOCAL, &rqstp->rq_flags); 1130 1131 p = (__be32 *)rqstp->rq_arg.head[0].iov_base; 1132 calldir = p[1]; 1133 if (calldir) 1134 len = receive_cb_reply(svsk, rqstp); 1135 1136 /* Reset TCP read info */ 1137 svsk->sk_datalen = 0; 1138 svc_tcp_fragment_received(svsk); 1139 1140 if (len < 0) 1141 goto error; 1142 1143 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); 1144 if (serv->sv_stats) 1145 serv->sv_stats->nettcpcnt++; 1146 1147 return rqstp->rq_arg.len; 1148 1149 error: 1150 if (len != -EAGAIN) 1151 goto err_delete; 1152 dprintk("RPC: TCP recvfrom got EAGAIN\n"); 1153 return 0; 1154 err_delete: 1155 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", 1156 svsk->sk_xprt.xpt_server->sv_name, -len); 1157 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1158 err_noclose: 1159 return 0; /* record not complete */ 1160 } 1161 1162 /* 1163 * Send out data on TCP socket. 1164 */ 1165 static int svc_tcp_sendto(struct svc_rqst *rqstp) 1166 { 1167 struct xdr_buf *xbufp = &rqstp->rq_res; 1168 int sent; 1169 __be32 reclen; 1170 1171 /* Set up the first element of the reply kvec. 1172 * Any other kvecs that may be in use have been taken 1173 * care of by the server implementation itself. 1174 */ 1175 reclen = htonl(0x80000000|((xbufp->len ) - 4)); 1176 memcpy(xbufp->head[0].iov_base, &reclen, 4); 1177 1178 sent = svc_sendto(rqstp, &rqstp->rq_res); 1179 if (sent != xbufp->len) { 1180 printk(KERN_NOTICE 1181 "rpc-srv/tcp: %s: %s %d when sending %d bytes " 1182 "- shutting down socket\n", 1183 rqstp->rq_xprt->xpt_server->sv_name, 1184 (sent<0)?"got error":"sent only", 1185 sent, xbufp->len); 1186 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); 1187 svc_xprt_enqueue(rqstp->rq_xprt); 1188 sent = -EAGAIN; 1189 } 1190 return sent; 1191 } 1192 1193 /* 1194 * Setup response header. TCP has a 4B record length field. 1195 */ 1196 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) 1197 { 1198 struct kvec *resv = &rqstp->rq_res.head[0]; 1199 1200 /* tcp needs a space for the record length... */ 1201 svc_putnl(resv, 0); 1202 } 1203 1204 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, 1205 struct net *net, 1206 struct sockaddr *sa, int salen, 1207 int flags) 1208 { 1209 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); 1210 } 1211 1212 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1213 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, 1214 struct net *, struct sockaddr *, 1215 int, int); 1216 static void svc_bc_sock_free(struct svc_xprt *xprt); 1217 1218 static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, 1219 struct net *net, 1220 struct sockaddr *sa, int salen, 1221 int flags) 1222 { 1223 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); 1224 } 1225 1226 static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) 1227 { 1228 } 1229 1230 static const struct svc_xprt_ops svc_tcp_bc_ops = { 1231 .xpo_create = svc_bc_tcp_create, 1232 .xpo_detach = svc_bc_tcp_sock_detach, 1233 .xpo_free = svc_bc_sock_free, 1234 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, 1235 .xpo_secure_port = svc_sock_secure_port, 1236 }; 1237 1238 static struct svc_xprt_class svc_tcp_bc_class = { 1239 .xcl_name = "tcp-bc", 1240 .xcl_owner = THIS_MODULE, 1241 .xcl_ops = &svc_tcp_bc_ops, 1242 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, 1243 }; 1244 1245 static void svc_init_bc_xprt_sock(void) 1246 { 1247 svc_reg_xprt_class(&svc_tcp_bc_class); 1248 } 1249 1250 static void svc_cleanup_bc_xprt_sock(void) 1251 { 1252 svc_unreg_xprt_class(&svc_tcp_bc_class); 1253 } 1254 #else /* CONFIG_SUNRPC_BACKCHANNEL */ 1255 static void svc_init_bc_xprt_sock(void) 1256 { 1257 } 1258 1259 static void svc_cleanup_bc_xprt_sock(void) 1260 { 1261 } 1262 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1263 1264 static const struct svc_xprt_ops svc_tcp_ops = { 1265 .xpo_create = svc_tcp_create, 1266 .xpo_recvfrom = svc_tcp_recvfrom, 1267 .xpo_sendto = svc_tcp_sendto, 1268 .xpo_release_rqst = svc_release_skb, 1269 .xpo_detach = svc_tcp_sock_detach, 1270 .xpo_free = svc_sock_free, 1271 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, 1272 .xpo_has_wspace = svc_tcp_has_wspace, 1273 .xpo_accept = svc_tcp_accept, 1274 .xpo_secure_port = svc_sock_secure_port, 1275 .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt, 1276 }; 1277 1278 static struct svc_xprt_class svc_tcp_class = { 1279 .xcl_name = "tcp", 1280 .xcl_owner = THIS_MODULE, 1281 .xcl_ops = &svc_tcp_ops, 1282 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, 1283 .xcl_ident = XPRT_TRANSPORT_TCP, 1284 }; 1285 1286 void svc_init_xprt_sock(void) 1287 { 1288 svc_reg_xprt_class(&svc_tcp_class); 1289 svc_reg_xprt_class(&svc_udp_class); 1290 svc_init_bc_xprt_sock(); 1291 } 1292 1293 void svc_cleanup_xprt_sock(void) 1294 { 1295 svc_unreg_xprt_class(&svc_tcp_class); 1296 svc_unreg_xprt_class(&svc_udp_class); 1297 svc_cleanup_bc_xprt_sock(); 1298 } 1299 1300 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) 1301 { 1302 struct sock *sk = svsk->sk_sk; 1303 1304 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, 1305 &svsk->sk_xprt, serv); 1306 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); 1307 set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags); 1308 if (sk->sk_state == TCP_LISTEN) { 1309 dprintk("setting up TCP socket for listening\n"); 1310 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); 1311 sk->sk_data_ready = svc_tcp_listen_data_ready; 1312 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 1313 } else { 1314 dprintk("setting up TCP socket for reading\n"); 1315 sk->sk_state_change = svc_tcp_state_change; 1316 sk->sk_data_ready = svc_data_ready; 1317 sk->sk_write_space = svc_write_space; 1318 1319 svsk->sk_reclen = 0; 1320 svsk->sk_tcplen = 0; 1321 svsk->sk_datalen = 0; 1322 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); 1323 1324 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1325 1326 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 1327 switch (sk->sk_state) { 1328 case TCP_SYN_RECV: 1329 case TCP_ESTABLISHED: 1330 break; 1331 default: 1332 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1333 } 1334 } 1335 } 1336 1337 void svc_sock_update_bufs(struct svc_serv *serv) 1338 { 1339 /* 1340 * The number of server threads has changed. Update 1341 * rcvbuf and sndbuf accordingly on all sockets 1342 */ 1343 struct svc_sock *svsk; 1344 1345 spin_lock_bh(&serv->sv_lock); 1346 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) 1347 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); 1348 spin_unlock_bh(&serv->sv_lock); 1349 } 1350 EXPORT_SYMBOL_GPL(svc_sock_update_bufs); 1351 1352 /* 1353 * Initialize socket for RPC use and create svc_sock struct 1354 */ 1355 static struct svc_sock *svc_setup_socket(struct svc_serv *serv, 1356 struct socket *sock, 1357 int flags) 1358 { 1359 struct svc_sock *svsk; 1360 struct sock *inet; 1361 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); 1362 int err = 0; 1363 1364 dprintk("svc: svc_setup_socket %p\n", sock); 1365 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); 1366 if (!svsk) 1367 return ERR_PTR(-ENOMEM); 1368 1369 inet = sock->sk; 1370 1371 /* Register socket with portmapper */ 1372 if (pmap_register) 1373 err = svc_register(serv, sock_net(sock->sk), inet->sk_family, 1374 inet->sk_protocol, 1375 ntohs(inet_sk(inet)->inet_sport)); 1376 1377 if (err < 0) { 1378 kfree(svsk); 1379 return ERR_PTR(err); 1380 } 1381 1382 svsk->sk_sock = sock; 1383 svsk->sk_sk = inet; 1384 svsk->sk_ostate = inet->sk_state_change; 1385 svsk->sk_odata = inet->sk_data_ready; 1386 svsk->sk_owspace = inet->sk_write_space; 1387 /* 1388 * This barrier is necessary in order to prevent race condition 1389 * with svc_data_ready(), svc_listen_data_ready() and others 1390 * when calling callbacks above. 1391 */ 1392 wmb(); 1393 inet->sk_user_data = svsk; 1394 1395 /* Initialize the socket */ 1396 if (sock->type == SOCK_DGRAM) 1397 svc_udp_init(svsk, serv); 1398 else 1399 svc_tcp_init(svsk, serv); 1400 1401 dprintk("svc: svc_setup_socket created %p (inet %p), " 1402 "listen %d close %d\n", 1403 svsk, svsk->sk_sk, 1404 test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags), 1405 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); 1406 1407 return svsk; 1408 } 1409 1410 bool svc_alien_sock(struct net *net, int fd) 1411 { 1412 int err; 1413 struct socket *sock = sockfd_lookup(fd, &err); 1414 bool ret = false; 1415 1416 if (!sock) 1417 goto out; 1418 if (sock_net(sock->sk) != net) 1419 ret = true; 1420 sockfd_put(sock); 1421 out: 1422 return ret; 1423 } 1424 EXPORT_SYMBOL_GPL(svc_alien_sock); 1425 1426 /** 1427 * svc_addsock - add a listener socket to an RPC service 1428 * @serv: pointer to RPC service to which to add a new listener 1429 * @fd: file descriptor of the new listener 1430 * @name_return: pointer to buffer to fill in with name of listener 1431 * @len: size of the buffer 1432 * 1433 * Fills in socket name and returns positive length of name if successful. 1434 * Name is terminated with '\n'. On error, returns a negative errno 1435 * value. 1436 */ 1437 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, 1438 const size_t len) 1439 { 1440 int err = 0; 1441 struct socket *so = sockfd_lookup(fd, &err); 1442 struct svc_sock *svsk = NULL; 1443 struct sockaddr_storage addr; 1444 struct sockaddr *sin = (struct sockaddr *)&addr; 1445 int salen; 1446 1447 if (!so) 1448 return err; 1449 err = -EAFNOSUPPORT; 1450 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) 1451 goto out; 1452 err = -EPROTONOSUPPORT; 1453 if (so->sk->sk_protocol != IPPROTO_TCP && 1454 so->sk->sk_protocol != IPPROTO_UDP) 1455 goto out; 1456 err = -EISCONN; 1457 if (so->state > SS_UNCONNECTED) 1458 goto out; 1459 err = -ENOENT; 1460 if (!try_module_get(THIS_MODULE)) 1461 goto out; 1462 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); 1463 if (IS_ERR(svsk)) { 1464 module_put(THIS_MODULE); 1465 err = PTR_ERR(svsk); 1466 goto out; 1467 } 1468 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) 1469 svc_xprt_set_local(&svsk->sk_xprt, sin, salen); 1470 svc_add_new_perm_xprt(serv, &svsk->sk_xprt); 1471 return svc_one_sock_name(svsk, name_return, len); 1472 out: 1473 sockfd_put(so); 1474 return err; 1475 } 1476 EXPORT_SYMBOL_GPL(svc_addsock); 1477 1478 /* 1479 * Create socket for RPC service. 1480 */ 1481 static struct svc_xprt *svc_create_socket(struct svc_serv *serv, 1482 int protocol, 1483 struct net *net, 1484 struct sockaddr *sin, int len, 1485 int flags) 1486 { 1487 struct svc_sock *svsk; 1488 struct socket *sock; 1489 int error; 1490 int type; 1491 struct sockaddr_storage addr; 1492 struct sockaddr *newsin = (struct sockaddr *)&addr; 1493 int newlen; 1494 int family; 1495 int val; 1496 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 1497 1498 dprintk("svc: svc_create_socket(%s, %d, %s)\n", 1499 serv->sv_program->pg_name, protocol, 1500 __svc_print_addr(sin, buf, sizeof(buf))); 1501 1502 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { 1503 printk(KERN_WARNING "svc: only UDP and TCP " 1504 "sockets supported\n"); 1505 return ERR_PTR(-EINVAL); 1506 } 1507 1508 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; 1509 switch (sin->sa_family) { 1510 case AF_INET6: 1511 family = PF_INET6; 1512 break; 1513 case AF_INET: 1514 family = PF_INET; 1515 break; 1516 default: 1517 return ERR_PTR(-EINVAL); 1518 } 1519 1520 error = __sock_create(net, family, type, protocol, &sock, 1); 1521 if (error < 0) 1522 return ERR_PTR(error); 1523 1524 svc_reclassify_socket(sock); 1525 1526 /* 1527 * If this is an PF_INET6 listener, we want to avoid 1528 * getting requests from IPv4 remotes. Those should 1529 * be shunted to a PF_INET listener via rpcbind. 1530 */ 1531 val = 1; 1532 if (family == PF_INET6) 1533 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, 1534 (char *)&val, sizeof(val)); 1535 1536 if (type == SOCK_STREAM) 1537 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ 1538 error = kernel_bind(sock, sin, len); 1539 if (error < 0) 1540 goto bummer; 1541 1542 newlen = len; 1543 error = kernel_getsockname(sock, newsin, &newlen); 1544 if (error < 0) 1545 goto bummer; 1546 1547 if (protocol == IPPROTO_TCP) { 1548 if ((error = kernel_listen(sock, 64)) < 0) 1549 goto bummer; 1550 } 1551 1552 svsk = svc_setup_socket(serv, sock, flags); 1553 if (IS_ERR(svsk)) { 1554 error = PTR_ERR(svsk); 1555 goto bummer; 1556 } 1557 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); 1558 return (struct svc_xprt *)svsk; 1559 bummer: 1560 dprintk("svc: svc_create_socket error = %d\n", -error); 1561 sock_release(sock); 1562 return ERR_PTR(error); 1563 } 1564 1565 /* 1566 * Detach the svc_sock from the socket so that no 1567 * more callbacks occur. 1568 */ 1569 static void svc_sock_detach(struct svc_xprt *xprt) 1570 { 1571 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1572 struct sock *sk = svsk->sk_sk; 1573 1574 dprintk("svc: svc_sock_detach(%p)\n", svsk); 1575 1576 /* put back the old socket callbacks */ 1577 lock_sock(sk); 1578 sk->sk_state_change = svsk->sk_ostate; 1579 sk->sk_data_ready = svsk->sk_odata; 1580 sk->sk_write_space = svsk->sk_owspace; 1581 sk->sk_user_data = NULL; 1582 release_sock(sk); 1583 } 1584 1585 /* 1586 * Disconnect the socket, and reset the callbacks 1587 */ 1588 static void svc_tcp_sock_detach(struct svc_xprt *xprt) 1589 { 1590 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1591 1592 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); 1593 1594 svc_sock_detach(xprt); 1595 1596 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { 1597 svc_tcp_clear_pages(svsk); 1598 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); 1599 } 1600 } 1601 1602 /* 1603 * Free the svc_sock's socket resources and the svc_sock itself. 1604 */ 1605 static void svc_sock_free(struct svc_xprt *xprt) 1606 { 1607 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1608 dprintk("svc: svc_sock_free(%p)\n", svsk); 1609 1610 if (svsk->sk_sock->file) 1611 sockfd_put(svsk->sk_sock); 1612 else 1613 sock_release(svsk->sk_sock); 1614 kfree(svsk); 1615 } 1616 1617 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1618 /* 1619 * Create a back channel svc_xprt which shares the fore channel socket. 1620 */ 1621 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, 1622 int protocol, 1623 struct net *net, 1624 struct sockaddr *sin, int len, 1625 int flags) 1626 { 1627 struct svc_sock *svsk; 1628 struct svc_xprt *xprt; 1629 1630 if (protocol != IPPROTO_TCP) { 1631 printk(KERN_WARNING "svc: only TCP sockets" 1632 " supported on shared back channel\n"); 1633 return ERR_PTR(-EINVAL); 1634 } 1635 1636 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); 1637 if (!svsk) 1638 return ERR_PTR(-ENOMEM); 1639 1640 xprt = &svsk->sk_xprt; 1641 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); 1642 set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags); 1643 1644 serv->sv_bc_xprt = xprt; 1645 1646 return xprt; 1647 } 1648 1649 /* 1650 * Free a back channel svc_sock. 1651 */ 1652 static void svc_bc_sock_free(struct svc_xprt *xprt) 1653 { 1654 if (xprt) 1655 kfree(container_of(xprt, struct svc_sock, sk_xprt)); 1656 } 1657 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1658