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/tcp.h> 43 #include <net/tcp_states.h> 44 #include <asm/uaccess.h> 45 #include <asm/ioctls.h> 46 #include <trace/events/skb.h> 47 48 #include <linux/sunrpc/types.h> 49 #include <linux/sunrpc/clnt.h> 50 #include <linux/sunrpc/xdr.h> 51 #include <linux/sunrpc/msg_prot.h> 52 #include <linux/sunrpc/svcsock.h> 53 #include <linux/sunrpc/stats.h> 54 #include <linux/sunrpc/xprt.h> 55 56 #include "sunrpc.h" 57 58 #define RPCDBG_FACILITY RPCDBG_SVCXPRT 59 60 61 static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, 62 int flags); 63 static void svc_udp_data_ready(struct sock *, int); 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 BUG_ON(sock_owned_by_user(sk)); 88 switch (sk->sk_family) { 89 case AF_INET: 90 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", 91 &svc_slock_key[0], 92 "sk_xprt.xpt_lock-AF_INET-NFSD", 93 &svc_key[0]); 94 break; 95 96 case AF_INET6: 97 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", 98 &svc_slock_key[1], 99 "sk_xprt.xpt_lock-AF_INET6-NFSD", 100 &svc_key[1]); 101 break; 102 103 default: 104 BUG(); 105 } 106 } 107 #else 108 static void svc_reclassify_socket(struct socket *sock) 109 { 110 } 111 #endif 112 113 /* 114 * Release an skbuff after use 115 */ 116 static void svc_release_skb(struct svc_rqst *rqstp) 117 { 118 struct sk_buff *skb = rqstp->rq_xprt_ctxt; 119 120 if (skb) { 121 struct svc_sock *svsk = 122 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 123 rqstp->rq_xprt_ctxt = NULL; 124 125 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); 126 skb_free_datagram_locked(svsk->sk_sk, skb); 127 } 128 } 129 130 union svc_pktinfo_u { 131 struct in_pktinfo pkti; 132 struct in6_pktinfo pkti6; 133 }; 134 #define SVC_PKTINFO_SPACE \ 135 CMSG_SPACE(sizeof(union svc_pktinfo_u)) 136 137 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) 138 { 139 struct svc_sock *svsk = 140 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 141 switch (svsk->sk_sk->sk_family) { 142 case AF_INET: { 143 struct in_pktinfo *pki = CMSG_DATA(cmh); 144 145 cmh->cmsg_level = SOL_IP; 146 cmh->cmsg_type = IP_PKTINFO; 147 pki->ipi_ifindex = 0; 148 pki->ipi_spec_dst.s_addr = 149 svc_daddr_in(rqstp)->sin_addr.s_addr; 150 cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); 151 } 152 break; 153 154 case AF_INET6: { 155 struct in6_pktinfo *pki = CMSG_DATA(cmh); 156 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); 157 158 cmh->cmsg_level = SOL_IPV6; 159 cmh->cmsg_type = IPV6_PKTINFO; 160 pki->ipi6_ifindex = daddr->sin6_scope_id; 161 pki->ipi6_addr = daddr->sin6_addr; 162 cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); 163 } 164 break; 165 } 166 } 167 168 /* 169 * send routine intended to be shared by the fore- and back-channel 170 */ 171 int svc_send_common(struct socket *sock, struct xdr_buf *xdr, 172 struct page *headpage, unsigned long headoffset, 173 struct page *tailpage, unsigned long tailoffset) 174 { 175 int result; 176 int size; 177 struct page **ppage = xdr->pages; 178 size_t base = xdr->page_base; 179 unsigned int pglen = xdr->page_len; 180 unsigned int flags = MSG_MORE; 181 int slen; 182 int len = 0; 183 184 slen = xdr->len; 185 186 /* send head */ 187 if (slen == xdr->head[0].iov_len) 188 flags = 0; 189 len = kernel_sendpage(sock, headpage, headoffset, 190 xdr->head[0].iov_len, flags); 191 if (len != xdr->head[0].iov_len) 192 goto out; 193 slen -= xdr->head[0].iov_len; 194 if (slen == 0) 195 goto out; 196 197 /* send page data */ 198 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; 199 while (pglen > 0) { 200 if (slen == size) 201 flags = 0; 202 result = kernel_sendpage(sock, *ppage, base, size, flags); 203 if (result > 0) 204 len += result; 205 if (result != size) 206 goto out; 207 slen -= size; 208 pglen -= size; 209 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; 210 base = 0; 211 ppage++; 212 } 213 214 /* send tail */ 215 if (xdr->tail[0].iov_len) { 216 result = kernel_sendpage(sock, tailpage, tailoffset, 217 xdr->tail[0].iov_len, 0); 218 if (result > 0) 219 len += result; 220 } 221 222 out: 223 return len; 224 } 225 226 227 /* 228 * Generic sendto routine 229 */ 230 static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) 231 { 232 struct svc_sock *svsk = 233 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 234 struct socket *sock = svsk->sk_sock; 235 union { 236 struct cmsghdr hdr; 237 long all[SVC_PKTINFO_SPACE / sizeof(long)]; 238 } buffer; 239 struct cmsghdr *cmh = &buffer.hdr; 240 int len = 0; 241 unsigned long tailoff; 242 unsigned long headoff; 243 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 244 245 if (rqstp->rq_prot == IPPROTO_UDP) { 246 struct msghdr msg = { 247 .msg_name = &rqstp->rq_addr, 248 .msg_namelen = rqstp->rq_addrlen, 249 .msg_control = cmh, 250 .msg_controllen = sizeof(buffer), 251 .msg_flags = MSG_MORE, 252 }; 253 254 svc_set_cmsg_data(rqstp, cmh); 255 256 if (sock_sendmsg(sock, &msg, 0) < 0) 257 goto out; 258 } 259 260 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); 261 headoff = 0; 262 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, 263 rqstp->rq_respages[0], tailoff); 264 265 out: 266 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", 267 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, 268 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); 269 270 return len; 271 } 272 273 /* 274 * Report socket names for nfsdfs 275 */ 276 static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) 277 { 278 const struct sock *sk = svsk->sk_sk; 279 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? 280 "udp" : "tcp"; 281 int len; 282 283 switch (sk->sk_family) { 284 case PF_INET: 285 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", 286 proto_name, 287 &inet_sk(sk)->inet_rcv_saddr, 288 inet_sk(sk)->inet_num); 289 break; 290 case PF_INET6: 291 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", 292 proto_name, 293 &inet6_sk(sk)->rcv_saddr, 294 inet_sk(sk)->inet_num); 295 break; 296 default: 297 len = snprintf(buf, remaining, "*unknown-%d*\n", 298 sk->sk_family); 299 } 300 301 if (len >= remaining) { 302 *buf = '\0'; 303 return -ENAMETOOLONG; 304 } 305 return len; 306 } 307 308 /* 309 * Check input queue length 310 */ 311 static int svc_recv_available(struct svc_sock *svsk) 312 { 313 struct socket *sock = svsk->sk_sock; 314 int avail, err; 315 316 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); 317 318 return (err >= 0)? avail : err; 319 } 320 321 /* 322 * Generic recvfrom routine. 323 */ 324 static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, 325 int buflen) 326 { 327 struct svc_sock *svsk = 328 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 329 struct msghdr msg = { 330 .msg_flags = MSG_DONTWAIT, 331 }; 332 int len; 333 334 rqstp->rq_xprt_hlen = 0; 335 336 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, 337 msg.msg_flags); 338 339 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", 340 svsk, iov[0].iov_base, iov[0].iov_len, len); 341 return len; 342 } 343 344 static int svc_partial_recvfrom(struct svc_rqst *rqstp, 345 struct kvec *iov, int nr, 346 int buflen, unsigned int base) 347 { 348 size_t save_iovlen; 349 void *save_iovbase; 350 unsigned int i; 351 int ret; 352 353 if (base == 0) 354 return svc_recvfrom(rqstp, iov, nr, buflen); 355 356 for (i = 0; i < nr; i++) { 357 if (iov[i].iov_len > base) 358 break; 359 base -= iov[i].iov_len; 360 } 361 save_iovlen = iov[i].iov_len; 362 save_iovbase = iov[i].iov_base; 363 iov[i].iov_len -= base; 364 iov[i].iov_base += base; 365 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); 366 iov[i].iov_len = save_iovlen; 367 iov[i].iov_base = save_iovbase; 368 return ret; 369 } 370 371 /* 372 * Set socket snd and rcv buffer lengths 373 */ 374 static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, 375 unsigned int rcv) 376 { 377 #if 0 378 mm_segment_t oldfs; 379 oldfs = get_fs(); set_fs(KERNEL_DS); 380 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, 381 (char*)&snd, sizeof(snd)); 382 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 383 (char*)&rcv, sizeof(rcv)); 384 #else 385 /* sock_setsockopt limits use to sysctl_?mem_max, 386 * which isn't acceptable. Until that is made conditional 387 * on not having CAP_SYS_RESOURCE or similar, we go direct... 388 * DaveM said I could! 389 */ 390 lock_sock(sock->sk); 391 sock->sk->sk_sndbuf = snd * 2; 392 sock->sk->sk_rcvbuf = rcv * 2; 393 sock->sk->sk_write_space(sock->sk); 394 release_sock(sock->sk); 395 #endif 396 } 397 /* 398 * INET callback when data has been received on the socket. 399 */ 400 static void svc_udp_data_ready(struct sock *sk, int count) 401 { 402 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 403 wait_queue_head_t *wq = sk_sleep(sk); 404 405 if (svsk) { 406 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", 407 svsk, sk, count, 408 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); 409 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 410 svc_xprt_enqueue(&svsk->sk_xprt); 411 } 412 if (wq && waitqueue_active(wq)) 413 wake_up_interruptible(wq); 414 } 415 416 /* 417 * INET callback when space is newly available on the socket. 418 */ 419 static void svc_write_space(struct sock *sk) 420 { 421 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); 422 wait_queue_head_t *wq = sk_sleep(sk); 423 424 if (svsk) { 425 dprintk("svc: socket %p(inet %p), write_space busy=%d\n", 426 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); 427 svc_xprt_enqueue(&svsk->sk_xprt); 428 } 429 430 if (wq && waitqueue_active(wq)) { 431 dprintk("RPC svc_write_space: someone sleeping on %p\n", 432 svsk); 433 wake_up_interruptible(wq); 434 } 435 } 436 437 static void svc_tcp_write_space(struct sock *sk) 438 { 439 struct socket *sock = sk->sk_socket; 440 441 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock) 442 clear_bit(SOCK_NOSPACE, &sock->flags); 443 svc_write_space(sk); 444 } 445 446 /* 447 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo 448 */ 449 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, 450 struct cmsghdr *cmh) 451 { 452 struct in_pktinfo *pki = CMSG_DATA(cmh); 453 struct sockaddr_in *daddr = svc_daddr_in(rqstp); 454 455 if (cmh->cmsg_type != IP_PKTINFO) 456 return 0; 457 458 daddr->sin_family = AF_INET; 459 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; 460 return 1; 461 } 462 463 /* 464 * See net/ipv6/datagram.c : datagram_recv_ctl 465 */ 466 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, 467 struct cmsghdr *cmh) 468 { 469 struct in6_pktinfo *pki = CMSG_DATA(cmh); 470 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); 471 472 if (cmh->cmsg_type != IPV6_PKTINFO) 473 return 0; 474 475 daddr->sin6_family = AF_INET6; 476 daddr->sin6_addr = pki->ipi6_addr; 477 daddr->sin6_scope_id = pki->ipi6_ifindex; 478 return 1; 479 } 480 481 /* 482 * Copy the UDP datagram's destination address to the rqstp structure. 483 * The 'destination' address in this case is the address to which the 484 * peer sent the datagram, i.e. our local address. For multihomed 485 * hosts, this can change from msg to msg. Note that only the IP 486 * address changes, the port number should remain the same. 487 */ 488 static int svc_udp_get_dest_address(struct svc_rqst *rqstp, 489 struct cmsghdr *cmh) 490 { 491 switch (cmh->cmsg_level) { 492 case SOL_IP: 493 return svc_udp_get_dest_address4(rqstp, cmh); 494 case SOL_IPV6: 495 return svc_udp_get_dest_address6(rqstp, cmh); 496 } 497 498 return 0; 499 } 500 501 /* 502 * Receive a datagram from a UDP socket. 503 */ 504 static int svc_udp_recvfrom(struct svc_rqst *rqstp) 505 { 506 struct svc_sock *svsk = 507 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 508 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 509 struct sk_buff *skb; 510 union { 511 struct cmsghdr hdr; 512 long all[SVC_PKTINFO_SPACE / sizeof(long)]; 513 } buffer; 514 struct cmsghdr *cmh = &buffer.hdr; 515 struct msghdr msg = { 516 .msg_name = svc_addr(rqstp), 517 .msg_control = cmh, 518 .msg_controllen = sizeof(buffer), 519 .msg_flags = MSG_DONTWAIT, 520 }; 521 size_t len; 522 int err; 523 524 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) 525 /* udp sockets need large rcvbuf as all pending 526 * requests are still in that buffer. sndbuf must 527 * also be large enough that there is enough space 528 * for one reply per thread. We count all threads 529 * rather than threads in a particular pool, which 530 * provides an upper bound on the number of threads 531 * which will access the socket. 532 */ 533 svc_sock_setbufsize(svsk->sk_sock, 534 (serv->sv_nrthreads+3) * serv->sv_max_mesg, 535 (serv->sv_nrthreads+3) * serv->sv_max_mesg); 536 537 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 538 skb = NULL; 539 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, 540 0, 0, MSG_PEEK | MSG_DONTWAIT); 541 if (err >= 0) 542 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); 543 544 if (skb == NULL) { 545 if (err != -EAGAIN) { 546 /* possibly an icmp error */ 547 dprintk("svc: recvfrom returned error %d\n", -err); 548 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 549 } 550 return 0; 551 } 552 len = svc_addr_len(svc_addr(rqstp)); 553 rqstp->rq_addrlen = len; 554 if (skb->tstamp.tv64 == 0) { 555 skb->tstamp = ktime_get_real(); 556 /* Don't enable netstamp, sunrpc doesn't 557 need that much accuracy */ 558 } 559 svsk->sk_sk->sk_stamp = skb->tstamp; 560 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ 561 562 len = skb->len - sizeof(struct udphdr); 563 rqstp->rq_arg.len = len; 564 565 rqstp->rq_prot = IPPROTO_UDP; 566 567 if (!svc_udp_get_dest_address(rqstp, cmh)) { 568 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", 569 cmh->cmsg_level, cmh->cmsg_type); 570 goto out_free; 571 } 572 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); 573 574 if (skb_is_nonlinear(skb)) { 575 /* we have to copy */ 576 local_bh_disable(); 577 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { 578 local_bh_enable(); 579 /* checksum error */ 580 goto out_free; 581 } 582 local_bh_enable(); 583 skb_free_datagram_locked(svsk->sk_sk, skb); 584 } else { 585 /* we can use it in-place */ 586 rqstp->rq_arg.head[0].iov_base = skb->data + 587 sizeof(struct udphdr); 588 rqstp->rq_arg.head[0].iov_len = len; 589 if (skb_checksum_complete(skb)) 590 goto out_free; 591 rqstp->rq_xprt_ctxt = skb; 592 } 593 594 rqstp->rq_arg.page_base = 0; 595 if (len <= rqstp->rq_arg.head[0].iov_len) { 596 rqstp->rq_arg.head[0].iov_len = len; 597 rqstp->rq_arg.page_len = 0; 598 rqstp->rq_respages = rqstp->rq_pages+1; 599 } else { 600 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; 601 rqstp->rq_respages = rqstp->rq_pages + 1 + 602 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); 603 } 604 605 if (serv->sv_stats) 606 serv->sv_stats->netudpcnt++; 607 608 return len; 609 out_free: 610 trace_kfree_skb(skb, svc_udp_recvfrom); 611 skb_free_datagram_locked(svsk->sk_sk, skb); 612 return 0; 613 } 614 615 static int 616 svc_udp_sendto(struct svc_rqst *rqstp) 617 { 618 int error; 619 620 error = svc_sendto(rqstp, &rqstp->rq_res); 621 if (error == -ECONNREFUSED) 622 /* ICMP error on earlier request. */ 623 error = svc_sendto(rqstp, &rqstp->rq_res); 624 625 return error; 626 } 627 628 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) 629 { 630 } 631 632 static int svc_udp_has_wspace(struct svc_xprt *xprt) 633 { 634 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 635 struct svc_serv *serv = xprt->xpt_server; 636 unsigned long required; 637 638 /* 639 * Set the SOCK_NOSPACE flag before checking the available 640 * sock space. 641 */ 642 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 643 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; 644 if (required*2 > sock_wspace(svsk->sk_sk)) 645 return 0; 646 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 647 return 1; 648 } 649 650 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) 651 { 652 BUG(); 653 return NULL; 654 } 655 656 static struct svc_xprt *svc_udp_create(struct svc_serv *serv, 657 struct net *net, 658 struct sockaddr *sa, int salen, 659 int flags) 660 { 661 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); 662 } 663 664 static struct svc_xprt_ops svc_udp_ops = { 665 .xpo_create = svc_udp_create, 666 .xpo_recvfrom = svc_udp_recvfrom, 667 .xpo_sendto = svc_udp_sendto, 668 .xpo_release_rqst = svc_release_skb, 669 .xpo_detach = svc_sock_detach, 670 .xpo_free = svc_sock_free, 671 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, 672 .xpo_has_wspace = svc_udp_has_wspace, 673 .xpo_accept = svc_udp_accept, 674 }; 675 676 static struct svc_xprt_class svc_udp_class = { 677 .xcl_name = "udp", 678 .xcl_owner = THIS_MODULE, 679 .xcl_ops = &svc_udp_ops, 680 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, 681 }; 682 683 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) 684 { 685 int err, level, optname, one = 1; 686 687 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, 688 &svsk->sk_xprt, serv); 689 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); 690 svsk->sk_sk->sk_data_ready = svc_udp_data_ready; 691 svsk->sk_sk->sk_write_space = svc_write_space; 692 693 /* initialise setting must have enough space to 694 * receive and respond to one request. 695 * svc_udp_recvfrom will re-adjust if necessary 696 */ 697 svc_sock_setbufsize(svsk->sk_sock, 698 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, 699 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); 700 701 /* data might have come in before data_ready set up */ 702 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 703 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); 704 705 /* make sure we get destination address info */ 706 switch (svsk->sk_sk->sk_family) { 707 case AF_INET: 708 level = SOL_IP; 709 optname = IP_PKTINFO; 710 break; 711 case AF_INET6: 712 level = SOL_IPV6; 713 optname = IPV6_RECVPKTINFO; 714 break; 715 default: 716 BUG(); 717 } 718 err = kernel_setsockopt(svsk->sk_sock, level, optname, 719 (char *)&one, sizeof(one)); 720 dprintk("svc: kernel_setsockopt returned %d\n", err); 721 } 722 723 /* 724 * A data_ready event on a listening socket means there's a connection 725 * pending. Do not use state_change as a substitute for it. 726 */ 727 static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) 728 { 729 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 730 wait_queue_head_t *wq; 731 732 dprintk("svc: socket %p TCP (listen) state change %d\n", 733 sk, sk->sk_state); 734 735 /* 736 * This callback may called twice when a new connection 737 * is established as a child socket inherits everything 738 * from a parent LISTEN socket. 739 * 1) data_ready method of the parent socket will be called 740 * when one of child sockets become ESTABLISHED. 741 * 2) data_ready method of the child socket may be called 742 * when it receives data before the socket is accepted. 743 * In case of 2, we should ignore it silently. 744 */ 745 if (sk->sk_state == TCP_LISTEN) { 746 if (svsk) { 747 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 748 svc_xprt_enqueue(&svsk->sk_xprt); 749 } else 750 printk("svc: socket %p: no user data\n", sk); 751 } 752 753 wq = sk_sleep(sk); 754 if (wq && waitqueue_active(wq)) 755 wake_up_interruptible_all(wq); 756 } 757 758 /* 759 * A state change on a connected socket means it's dying or dead. 760 */ 761 static void svc_tcp_state_change(struct sock *sk) 762 { 763 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 764 wait_queue_head_t *wq = sk_sleep(sk); 765 766 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", 767 sk, sk->sk_state, sk->sk_user_data); 768 769 if (!svsk) 770 printk("svc: socket %p: no user data\n", sk); 771 else { 772 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 773 svc_xprt_enqueue(&svsk->sk_xprt); 774 } 775 if (wq && waitqueue_active(wq)) 776 wake_up_interruptible_all(wq); 777 } 778 779 static void svc_tcp_data_ready(struct sock *sk, int count) 780 { 781 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 782 wait_queue_head_t *wq = sk_sleep(sk); 783 784 dprintk("svc: socket %p TCP data ready (svsk %p)\n", 785 sk, sk->sk_user_data); 786 if (svsk) { 787 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 788 svc_xprt_enqueue(&svsk->sk_xprt); 789 } 790 if (wq && waitqueue_active(wq)) 791 wake_up_interruptible(wq); 792 } 793 794 /* 795 * Accept a TCP connection 796 */ 797 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) 798 { 799 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 800 struct sockaddr_storage addr; 801 struct sockaddr *sin = (struct sockaddr *) &addr; 802 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 803 struct socket *sock = svsk->sk_sock; 804 struct socket *newsock; 805 struct svc_sock *newsvsk; 806 int err, slen; 807 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 808 809 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); 810 if (!sock) 811 return NULL; 812 813 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 814 err = kernel_accept(sock, &newsock, O_NONBLOCK); 815 if (err < 0) { 816 if (err == -ENOMEM) 817 printk(KERN_WARNING "%s: no more sockets!\n", 818 serv->sv_name); 819 else if (err != -EAGAIN) 820 net_warn_ratelimited("%s: accept failed (err %d)!\n", 821 serv->sv_name, -err); 822 return NULL; 823 } 824 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 825 826 err = kernel_getpeername(newsock, sin, &slen); 827 if (err < 0) { 828 net_warn_ratelimited("%s: peername failed (err %d)!\n", 829 serv->sv_name, -err); 830 goto failed; /* aborted connection or whatever */ 831 } 832 833 /* Ideally, we would want to reject connections from unauthorized 834 * hosts here, but when we get encryption, the IP of the host won't 835 * tell us anything. For now just warn about unpriv connections. 836 */ 837 if (!svc_port_is_privileged(sin)) { 838 dprintk(KERN_WARNING 839 "%s: connect from unprivileged port: %s\n", 840 serv->sv_name, 841 __svc_print_addr(sin, buf, sizeof(buf))); 842 } 843 dprintk("%s: connect from %s\n", serv->sv_name, 844 __svc_print_addr(sin, buf, sizeof(buf))); 845 846 /* make sure that a write doesn't block forever when 847 * low on memory 848 */ 849 newsock->sk->sk_sndtimeo = HZ*30; 850 851 newsvsk = svc_setup_socket(serv, newsock, 852 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); 853 if (IS_ERR(newsvsk)) 854 goto failed; 855 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); 856 err = kernel_getsockname(newsock, sin, &slen); 857 if (unlikely(err < 0)) { 858 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); 859 slen = offsetof(struct sockaddr, sa_data); 860 } 861 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); 862 863 if (serv->sv_stats) 864 serv->sv_stats->nettcpconn++; 865 866 return &newsvsk->sk_xprt; 867 868 failed: 869 sock_release(newsock); 870 return NULL; 871 } 872 873 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) 874 { 875 unsigned int i, len, npages; 876 877 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) 878 return 0; 879 len = svsk->sk_tcplen - sizeof(rpc_fraghdr); 880 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 881 for (i = 0; i < npages; i++) { 882 if (rqstp->rq_pages[i] != NULL) 883 put_page(rqstp->rq_pages[i]); 884 BUG_ON(svsk->sk_pages[i] == NULL); 885 rqstp->rq_pages[i] = svsk->sk_pages[i]; 886 svsk->sk_pages[i] = NULL; 887 } 888 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); 889 return len; 890 } 891 892 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) 893 { 894 unsigned int i, len, npages; 895 896 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) 897 return; 898 len = svsk->sk_tcplen - sizeof(rpc_fraghdr); 899 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 900 for (i = 0; i < npages; i++) { 901 svsk->sk_pages[i] = rqstp->rq_pages[i]; 902 rqstp->rq_pages[i] = NULL; 903 } 904 } 905 906 static void svc_tcp_clear_pages(struct svc_sock *svsk) 907 { 908 unsigned int i, len, npages; 909 910 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) 911 goto out; 912 len = svsk->sk_tcplen - sizeof(rpc_fraghdr); 913 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 914 for (i = 0; i < npages; i++) { 915 BUG_ON(svsk->sk_pages[i] == NULL); 916 put_page(svsk->sk_pages[i]); 917 svsk->sk_pages[i] = NULL; 918 } 919 out: 920 svsk->sk_tcplen = 0; 921 } 922 923 /* 924 * Receive data. 925 * If we haven't gotten the record length yet, get the next four bytes. 926 * Otherwise try to gobble up as much as possible up to the complete 927 * record length. 928 */ 929 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) 930 { 931 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 932 unsigned int want; 933 int len; 934 935 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 936 937 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { 938 struct kvec iov; 939 940 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; 941 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; 942 iov.iov_len = want; 943 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) 944 goto error; 945 svsk->sk_tcplen += len; 946 947 if (len < want) { 948 dprintk("svc: short recvfrom while reading record " 949 "length (%d of %d)\n", len, want); 950 return -EAGAIN; 951 } 952 953 svsk->sk_reclen = ntohl(svsk->sk_reclen); 954 if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) { 955 /* FIXME: technically, a record can be fragmented, 956 * and non-terminal fragments will not have the top 957 * bit set in the fragment length header. 958 * But apparently no known nfs clients send fragmented 959 * records. */ 960 net_notice_ratelimited("RPC: multiple fragments per record not supported\n"); 961 goto err_delete; 962 } 963 964 svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK; 965 dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); 966 if (svsk->sk_reclen > serv->sv_max_mesg) { 967 net_notice_ratelimited("RPC: fragment too large: 0x%08lx\n", 968 (unsigned long)svsk->sk_reclen); 969 goto err_delete; 970 } 971 } 972 973 if (svsk->sk_reclen < 8) 974 goto err_delete; /* client is nuts. */ 975 976 len = svsk->sk_reclen; 977 978 return len; 979 error: 980 dprintk("RPC: TCP recv_record got %d\n", len); 981 return len; 982 err_delete: 983 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 984 return -EAGAIN; 985 } 986 987 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) 988 { 989 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; 990 struct rpc_rqst *req = NULL; 991 struct kvec *src, *dst; 992 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; 993 __be32 xid; 994 __be32 calldir; 995 996 xid = *p++; 997 calldir = *p; 998 999 if (bc_xprt) 1000 req = xprt_lookup_rqst(bc_xprt, xid); 1001 1002 if (!req) { 1003 printk(KERN_NOTICE 1004 "%s: Got unrecognized reply: " 1005 "calldir 0x%x xpt_bc_xprt %p xid %08x\n", 1006 __func__, ntohl(calldir), 1007 bc_xprt, xid); 1008 return -EAGAIN; 1009 } 1010 1011 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); 1012 /* 1013 * XXX!: cheating for now! Only copying HEAD. 1014 * But we know this is good enough for now (in fact, for any 1015 * callback reply in the forseeable future). 1016 */ 1017 dst = &req->rq_private_buf.head[0]; 1018 src = &rqstp->rq_arg.head[0]; 1019 if (dst->iov_len < src->iov_len) 1020 return -EAGAIN; /* whatever; just giving up. */ 1021 memcpy(dst->iov_base, src->iov_base, src->iov_len); 1022 xprt_complete_rqst(req->rq_task, svsk->sk_reclen); 1023 rqstp->rq_arg.len = 0; 1024 return 0; 1025 } 1026 1027 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) 1028 { 1029 int i = 0; 1030 int t = 0; 1031 1032 while (t < len) { 1033 vec[i].iov_base = page_address(pages[i]); 1034 vec[i].iov_len = PAGE_SIZE; 1035 i++; 1036 t += PAGE_SIZE; 1037 } 1038 return i; 1039 } 1040 1041 1042 /* 1043 * Receive data from a TCP socket. 1044 */ 1045 static int svc_tcp_recvfrom(struct svc_rqst *rqstp) 1046 { 1047 struct svc_sock *svsk = 1048 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 1049 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 1050 int len; 1051 struct kvec *vec; 1052 unsigned int want, base; 1053 __be32 *p; 1054 __be32 calldir; 1055 int pnum; 1056 1057 dprintk("svc: tcp_recv %p data %d conn %d close %d\n", 1058 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), 1059 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), 1060 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); 1061 1062 len = svc_tcp_recv_record(svsk, rqstp); 1063 if (len < 0) 1064 goto error; 1065 1066 base = svc_tcp_restore_pages(svsk, rqstp); 1067 want = svsk->sk_reclen - base; 1068 1069 vec = rqstp->rq_vec; 1070 1071 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], 1072 svsk->sk_reclen); 1073 1074 rqstp->rq_respages = &rqstp->rq_pages[pnum]; 1075 1076 /* Now receive data */ 1077 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); 1078 if (len >= 0) 1079 svsk->sk_tcplen += len; 1080 if (len != want) { 1081 svc_tcp_save_pages(svsk, rqstp); 1082 if (len < 0 && len != -EAGAIN) 1083 goto err_other; 1084 dprintk("svc: incomplete TCP record (%d of %d)\n", 1085 svsk->sk_tcplen, svsk->sk_reclen); 1086 goto err_noclose; 1087 } 1088 1089 rqstp->rq_arg.len = svsk->sk_reclen; 1090 rqstp->rq_arg.page_base = 0; 1091 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { 1092 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; 1093 rqstp->rq_arg.page_len = 0; 1094 } else 1095 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; 1096 1097 rqstp->rq_xprt_ctxt = NULL; 1098 rqstp->rq_prot = IPPROTO_TCP; 1099 1100 p = (__be32 *)rqstp->rq_arg.head[0].iov_base; 1101 calldir = p[1]; 1102 if (calldir) 1103 len = receive_cb_reply(svsk, rqstp); 1104 1105 /* Reset TCP read info */ 1106 svsk->sk_reclen = 0; 1107 svsk->sk_tcplen = 0; 1108 /* If we have more data, signal svc_xprt_enqueue() to try again */ 1109 if (svc_recv_available(svsk) > sizeof(rpc_fraghdr)) 1110 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 1111 1112 if (len < 0) 1113 goto error; 1114 1115 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); 1116 if (serv->sv_stats) 1117 serv->sv_stats->nettcpcnt++; 1118 1119 dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len); 1120 return rqstp->rq_arg.len; 1121 1122 error: 1123 if (len != -EAGAIN) 1124 goto err_other; 1125 dprintk("RPC: TCP recvfrom got EAGAIN\n"); 1126 return 0; 1127 err_other: 1128 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", 1129 svsk->sk_xprt.xpt_server->sv_name, -len); 1130 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1131 err_noclose: 1132 return 0; /* record not complete */ 1133 } 1134 1135 /* 1136 * Send out data on TCP socket. 1137 */ 1138 static int svc_tcp_sendto(struct svc_rqst *rqstp) 1139 { 1140 struct xdr_buf *xbufp = &rqstp->rq_res; 1141 int sent; 1142 __be32 reclen; 1143 1144 /* Set up the first element of the reply kvec. 1145 * Any other kvecs that may be in use have been taken 1146 * care of by the server implementation itself. 1147 */ 1148 reclen = htonl(0x80000000|((xbufp->len ) - 4)); 1149 memcpy(xbufp->head[0].iov_base, &reclen, 4); 1150 1151 sent = svc_sendto(rqstp, &rqstp->rq_res); 1152 if (sent != xbufp->len) { 1153 printk(KERN_NOTICE 1154 "rpc-srv/tcp: %s: %s %d when sending %d bytes " 1155 "- shutting down socket\n", 1156 rqstp->rq_xprt->xpt_server->sv_name, 1157 (sent<0)?"got error":"sent only", 1158 sent, xbufp->len); 1159 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); 1160 svc_xprt_enqueue(rqstp->rq_xprt); 1161 sent = -EAGAIN; 1162 } 1163 return sent; 1164 } 1165 1166 /* 1167 * Setup response header. TCP has a 4B record length field. 1168 */ 1169 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) 1170 { 1171 struct kvec *resv = &rqstp->rq_res.head[0]; 1172 1173 /* tcp needs a space for the record length... */ 1174 svc_putnl(resv, 0); 1175 } 1176 1177 static int svc_tcp_has_wspace(struct svc_xprt *xprt) 1178 { 1179 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1180 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 1181 int required; 1182 1183 if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) 1184 return 1; 1185 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; 1186 if (sk_stream_wspace(svsk->sk_sk) >= required) 1187 return 1; 1188 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 1189 return 0; 1190 } 1191 1192 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, 1193 struct net *net, 1194 struct sockaddr *sa, int salen, 1195 int flags) 1196 { 1197 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); 1198 } 1199 1200 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1201 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, 1202 struct net *, struct sockaddr *, 1203 int, int); 1204 static void svc_bc_sock_free(struct svc_xprt *xprt); 1205 1206 static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, 1207 struct net *net, 1208 struct sockaddr *sa, int salen, 1209 int flags) 1210 { 1211 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); 1212 } 1213 1214 static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) 1215 { 1216 } 1217 1218 static struct svc_xprt_ops svc_tcp_bc_ops = { 1219 .xpo_create = svc_bc_tcp_create, 1220 .xpo_detach = svc_bc_tcp_sock_detach, 1221 .xpo_free = svc_bc_sock_free, 1222 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, 1223 }; 1224 1225 static struct svc_xprt_class svc_tcp_bc_class = { 1226 .xcl_name = "tcp-bc", 1227 .xcl_owner = THIS_MODULE, 1228 .xcl_ops = &svc_tcp_bc_ops, 1229 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, 1230 }; 1231 1232 static void svc_init_bc_xprt_sock(void) 1233 { 1234 svc_reg_xprt_class(&svc_tcp_bc_class); 1235 } 1236 1237 static void svc_cleanup_bc_xprt_sock(void) 1238 { 1239 svc_unreg_xprt_class(&svc_tcp_bc_class); 1240 } 1241 #else /* CONFIG_SUNRPC_BACKCHANNEL */ 1242 static void svc_init_bc_xprt_sock(void) 1243 { 1244 } 1245 1246 static void svc_cleanup_bc_xprt_sock(void) 1247 { 1248 } 1249 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1250 1251 static struct svc_xprt_ops svc_tcp_ops = { 1252 .xpo_create = svc_tcp_create, 1253 .xpo_recvfrom = svc_tcp_recvfrom, 1254 .xpo_sendto = svc_tcp_sendto, 1255 .xpo_release_rqst = svc_release_skb, 1256 .xpo_detach = svc_tcp_sock_detach, 1257 .xpo_free = svc_sock_free, 1258 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, 1259 .xpo_has_wspace = svc_tcp_has_wspace, 1260 .xpo_accept = svc_tcp_accept, 1261 }; 1262 1263 static struct svc_xprt_class svc_tcp_class = { 1264 .xcl_name = "tcp", 1265 .xcl_owner = THIS_MODULE, 1266 .xcl_ops = &svc_tcp_ops, 1267 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, 1268 }; 1269 1270 void svc_init_xprt_sock(void) 1271 { 1272 svc_reg_xprt_class(&svc_tcp_class); 1273 svc_reg_xprt_class(&svc_udp_class); 1274 svc_init_bc_xprt_sock(); 1275 } 1276 1277 void svc_cleanup_xprt_sock(void) 1278 { 1279 svc_unreg_xprt_class(&svc_tcp_class); 1280 svc_unreg_xprt_class(&svc_udp_class); 1281 svc_cleanup_bc_xprt_sock(); 1282 } 1283 1284 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) 1285 { 1286 struct sock *sk = svsk->sk_sk; 1287 1288 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, 1289 &svsk->sk_xprt, serv); 1290 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); 1291 if (sk->sk_state == TCP_LISTEN) { 1292 dprintk("setting up TCP socket for listening\n"); 1293 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); 1294 sk->sk_data_ready = svc_tcp_listen_data_ready; 1295 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 1296 } else { 1297 dprintk("setting up TCP socket for reading\n"); 1298 sk->sk_state_change = svc_tcp_state_change; 1299 sk->sk_data_ready = svc_tcp_data_ready; 1300 sk->sk_write_space = svc_tcp_write_space; 1301 1302 svsk->sk_reclen = 0; 1303 svsk->sk_tcplen = 0; 1304 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); 1305 1306 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1307 1308 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 1309 if (sk->sk_state != TCP_ESTABLISHED) 1310 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1311 } 1312 } 1313 1314 void svc_sock_update_bufs(struct svc_serv *serv) 1315 { 1316 /* 1317 * The number of server threads has changed. Update 1318 * rcvbuf and sndbuf accordingly on all sockets 1319 */ 1320 struct svc_sock *svsk; 1321 1322 spin_lock_bh(&serv->sv_lock); 1323 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) 1324 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); 1325 spin_unlock_bh(&serv->sv_lock); 1326 } 1327 EXPORT_SYMBOL_GPL(svc_sock_update_bufs); 1328 1329 /* 1330 * Initialize socket for RPC use and create svc_sock struct 1331 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. 1332 */ 1333 static struct svc_sock *svc_setup_socket(struct svc_serv *serv, 1334 struct socket *sock, 1335 int flags) 1336 { 1337 struct svc_sock *svsk; 1338 struct sock *inet; 1339 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); 1340 int err = 0; 1341 1342 dprintk("svc: svc_setup_socket %p\n", sock); 1343 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); 1344 if (!svsk) 1345 return ERR_PTR(-ENOMEM); 1346 1347 inet = sock->sk; 1348 1349 /* Register socket with portmapper */ 1350 if (pmap_register) 1351 err = svc_register(serv, sock_net(sock->sk), inet->sk_family, 1352 inet->sk_protocol, 1353 ntohs(inet_sk(inet)->inet_sport)); 1354 1355 if (err < 0) { 1356 kfree(svsk); 1357 return ERR_PTR(err); 1358 } 1359 1360 inet->sk_user_data = svsk; 1361 svsk->sk_sock = sock; 1362 svsk->sk_sk = inet; 1363 svsk->sk_ostate = inet->sk_state_change; 1364 svsk->sk_odata = inet->sk_data_ready; 1365 svsk->sk_owspace = inet->sk_write_space; 1366 1367 /* Initialize the socket */ 1368 if (sock->type == SOCK_DGRAM) 1369 svc_udp_init(svsk, serv); 1370 else { 1371 /* initialise setting must have enough space to 1372 * receive and respond to one request. 1373 */ 1374 svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, 1375 4 * serv->sv_max_mesg); 1376 svc_tcp_init(svsk, serv); 1377 } 1378 1379 dprintk("svc: svc_setup_socket created %p (inet %p)\n", 1380 svsk, svsk->sk_sk); 1381 1382 return svsk; 1383 } 1384 1385 /** 1386 * svc_addsock - add a listener socket to an RPC service 1387 * @serv: pointer to RPC service to which to add a new listener 1388 * @fd: file descriptor of the new listener 1389 * @name_return: pointer to buffer to fill in with name of listener 1390 * @len: size of the buffer 1391 * 1392 * Fills in socket name and returns positive length of name if successful. 1393 * Name is terminated with '\n'. On error, returns a negative errno 1394 * value. 1395 */ 1396 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, 1397 const size_t len) 1398 { 1399 int err = 0; 1400 struct socket *so = sockfd_lookup(fd, &err); 1401 struct svc_sock *svsk = NULL; 1402 struct sockaddr_storage addr; 1403 struct sockaddr *sin = (struct sockaddr *)&addr; 1404 int salen; 1405 1406 if (!so) 1407 return err; 1408 err = -EAFNOSUPPORT; 1409 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) 1410 goto out; 1411 err = -EPROTONOSUPPORT; 1412 if (so->sk->sk_protocol != IPPROTO_TCP && 1413 so->sk->sk_protocol != IPPROTO_UDP) 1414 goto out; 1415 err = -EISCONN; 1416 if (so->state > SS_UNCONNECTED) 1417 goto out; 1418 err = -ENOENT; 1419 if (!try_module_get(THIS_MODULE)) 1420 goto out; 1421 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); 1422 if (IS_ERR(svsk)) { 1423 module_put(THIS_MODULE); 1424 err = PTR_ERR(svsk); 1425 goto out; 1426 } 1427 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) 1428 svc_xprt_set_local(&svsk->sk_xprt, sin, salen); 1429 svc_add_new_perm_xprt(serv, &svsk->sk_xprt); 1430 return svc_one_sock_name(svsk, name_return, len); 1431 out: 1432 sockfd_put(so); 1433 return err; 1434 } 1435 EXPORT_SYMBOL_GPL(svc_addsock); 1436 1437 /* 1438 * Create socket for RPC service. 1439 */ 1440 static struct svc_xprt *svc_create_socket(struct svc_serv *serv, 1441 int protocol, 1442 struct net *net, 1443 struct sockaddr *sin, int len, 1444 int flags) 1445 { 1446 struct svc_sock *svsk; 1447 struct socket *sock; 1448 int error; 1449 int type; 1450 struct sockaddr_storage addr; 1451 struct sockaddr *newsin = (struct sockaddr *)&addr; 1452 int newlen; 1453 int family; 1454 int val; 1455 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 1456 1457 dprintk("svc: svc_create_socket(%s, %d, %s)\n", 1458 serv->sv_program->pg_name, protocol, 1459 __svc_print_addr(sin, buf, sizeof(buf))); 1460 1461 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { 1462 printk(KERN_WARNING "svc: only UDP and TCP " 1463 "sockets supported\n"); 1464 return ERR_PTR(-EINVAL); 1465 } 1466 1467 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; 1468 switch (sin->sa_family) { 1469 case AF_INET6: 1470 family = PF_INET6; 1471 break; 1472 case AF_INET: 1473 family = PF_INET; 1474 break; 1475 default: 1476 return ERR_PTR(-EINVAL); 1477 } 1478 1479 error = __sock_create(net, family, type, protocol, &sock, 1); 1480 if (error < 0) 1481 return ERR_PTR(error); 1482 1483 svc_reclassify_socket(sock); 1484 1485 /* 1486 * If this is an PF_INET6 listener, we want to avoid 1487 * getting requests from IPv4 remotes. Those should 1488 * be shunted to a PF_INET listener via rpcbind. 1489 */ 1490 val = 1; 1491 if (family == PF_INET6) 1492 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, 1493 (char *)&val, sizeof(val)); 1494 1495 if (type == SOCK_STREAM) 1496 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ 1497 error = kernel_bind(sock, sin, len); 1498 if (error < 0) 1499 goto bummer; 1500 1501 newlen = len; 1502 error = kernel_getsockname(sock, newsin, &newlen); 1503 if (error < 0) 1504 goto bummer; 1505 1506 if (protocol == IPPROTO_TCP) { 1507 if ((error = kernel_listen(sock, 64)) < 0) 1508 goto bummer; 1509 } 1510 1511 svsk = svc_setup_socket(serv, sock, flags); 1512 if (IS_ERR(svsk)) { 1513 error = PTR_ERR(svsk); 1514 goto bummer; 1515 } 1516 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); 1517 return (struct svc_xprt *)svsk; 1518 bummer: 1519 dprintk("svc: svc_create_socket error = %d\n", -error); 1520 sock_release(sock); 1521 return ERR_PTR(error); 1522 } 1523 1524 /* 1525 * Detach the svc_sock from the socket so that no 1526 * more callbacks occur. 1527 */ 1528 static void svc_sock_detach(struct svc_xprt *xprt) 1529 { 1530 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1531 struct sock *sk = svsk->sk_sk; 1532 wait_queue_head_t *wq; 1533 1534 dprintk("svc: svc_sock_detach(%p)\n", svsk); 1535 1536 /* put back the old socket callbacks */ 1537 sk->sk_state_change = svsk->sk_ostate; 1538 sk->sk_data_ready = svsk->sk_odata; 1539 sk->sk_write_space = svsk->sk_owspace; 1540 1541 wq = sk_sleep(sk); 1542 if (wq && waitqueue_active(wq)) 1543 wake_up_interruptible(wq); 1544 } 1545 1546 /* 1547 * Disconnect the socket, and reset the callbacks 1548 */ 1549 static void svc_tcp_sock_detach(struct svc_xprt *xprt) 1550 { 1551 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1552 1553 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); 1554 1555 svc_sock_detach(xprt); 1556 1557 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { 1558 svc_tcp_clear_pages(svsk); 1559 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); 1560 } 1561 } 1562 1563 /* 1564 * Free the svc_sock's socket resources and the svc_sock itself. 1565 */ 1566 static void svc_sock_free(struct svc_xprt *xprt) 1567 { 1568 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1569 dprintk("svc: svc_sock_free(%p)\n", svsk); 1570 1571 if (svsk->sk_sock->file) 1572 sockfd_put(svsk->sk_sock); 1573 else 1574 sock_release(svsk->sk_sock); 1575 kfree(svsk); 1576 } 1577 1578 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1579 /* 1580 * Create a back channel svc_xprt which shares the fore channel socket. 1581 */ 1582 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, 1583 int protocol, 1584 struct net *net, 1585 struct sockaddr *sin, int len, 1586 int flags) 1587 { 1588 struct svc_sock *svsk; 1589 struct svc_xprt *xprt; 1590 1591 if (protocol != IPPROTO_TCP) { 1592 printk(KERN_WARNING "svc: only TCP sockets" 1593 " supported on shared back channel\n"); 1594 return ERR_PTR(-EINVAL); 1595 } 1596 1597 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); 1598 if (!svsk) 1599 return ERR_PTR(-ENOMEM); 1600 1601 xprt = &svsk->sk_xprt; 1602 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); 1603 1604 serv->sv_bc_xprt = xprt; 1605 1606 return xprt; 1607 } 1608 1609 /* 1610 * Free a back channel svc_sock. 1611 */ 1612 static void svc_bc_sock_free(struct svc_xprt *xprt) 1613 { 1614 if (xprt) 1615 kfree(container_of(xprt, struct svc_sock, sk_xprt)); 1616 } 1617 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1618