Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* transport.c: Rx Transport routines |
| 2 | * |
| 3 | * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <rxrpc/transport.h> |
| 16 | #include <rxrpc/peer.h> |
| 17 | #include <rxrpc/connection.h> |
| 18 | #include <rxrpc/call.h> |
| 19 | #include <rxrpc/message.h> |
| 20 | #include <rxrpc/krxiod.h> |
| 21 | #include <rxrpc/krxsecd.h> |
| 22 | #include <linux/udp.h> |
| 23 | #include <linux/in.h> |
| 24 | #include <linux/in6.h> |
| 25 | #include <linux/icmp.h> |
| 26 | #include <net/sock.h> |
| 27 | #include <net/ip.h> |
| 28 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
| 29 | #include <linux/ipv6.h> /* this should _really_ be in errqueue.h.. */ |
| 30 | #endif |
| 31 | #include <linux/errqueue.h> |
| 32 | #include <asm/uaccess.h> |
| 33 | #include <asm/checksum.h> |
| 34 | #include "internal.h" |
| 35 | |
| 36 | struct errormsg { |
| 37 | struct cmsghdr cmsg; /* control message header */ |
| 38 | struct sock_extended_err ee; /* extended error information */ |
| 39 | struct sockaddr_in icmp_src; /* ICMP packet source address */ |
| 40 | }; |
| 41 | |
| 42 | static DEFINE_SPINLOCK(rxrpc_transports_lock); |
| 43 | static struct list_head rxrpc_transports = LIST_HEAD_INIT(rxrpc_transports); |
| 44 | |
| 45 | __RXACCT_DECL(atomic_t rxrpc_transport_count); |
| 46 | LIST_HEAD(rxrpc_proc_transports); |
| 47 | DECLARE_RWSEM(rxrpc_proc_transports_sem); |
| 48 | |
| 49 | static void rxrpc_data_ready(struct sock *sk, int count); |
| 50 | static void rxrpc_error_report(struct sock *sk); |
| 51 | static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans, |
| 52 | struct list_head *msgq); |
| 53 | static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans); |
| 54 | |
| 55 | /*****************************************************************************/ |
| 56 | /* |
| 57 | * create a new transport endpoint using the specified UDP port |
| 58 | */ |
| 59 | int rxrpc_create_transport(unsigned short port, |
| 60 | struct rxrpc_transport **_trans) |
| 61 | { |
| 62 | struct rxrpc_transport *trans; |
| 63 | struct sockaddr_in sin; |
| 64 | mm_segment_t oldfs; |
| 65 | struct sock *sock; |
| 66 | int ret, opt; |
| 67 | |
| 68 | _enter("%hu", port); |
| 69 | |
| 70 | trans = kmalloc(sizeof(struct rxrpc_transport), GFP_KERNEL); |
| 71 | if (!trans) |
| 72 | return -ENOMEM; |
| 73 | |
| 74 | memset(trans, 0, sizeof(struct rxrpc_transport)); |
| 75 | atomic_set(&trans->usage, 1); |
| 76 | INIT_LIST_HEAD(&trans->services); |
| 77 | INIT_LIST_HEAD(&trans->link); |
| 78 | INIT_LIST_HEAD(&trans->krxiodq_link); |
| 79 | spin_lock_init(&trans->lock); |
| 80 | INIT_LIST_HEAD(&trans->peer_active); |
| 81 | INIT_LIST_HEAD(&trans->peer_graveyard); |
| 82 | spin_lock_init(&trans->peer_gylock); |
| 83 | init_waitqueue_head(&trans->peer_gy_waitq); |
| 84 | rwlock_init(&trans->peer_lock); |
| 85 | atomic_set(&trans->peer_count, 0); |
| 86 | trans->port = port; |
| 87 | |
| 88 | /* create a UDP socket to be my actual transport endpoint */ |
| 89 | ret = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &trans->socket); |
| 90 | if (ret < 0) |
| 91 | goto error; |
| 92 | |
| 93 | /* use the specified port */ |
| 94 | if (port) { |
| 95 | memset(&sin, 0, sizeof(sin)); |
| 96 | sin.sin_family = AF_INET; |
| 97 | sin.sin_port = htons(port); |
| 98 | ret = trans->socket->ops->bind(trans->socket, |
| 99 | (struct sockaddr *) &sin, |
| 100 | sizeof(sin)); |
| 101 | if (ret < 0) |
| 102 | goto error; |
| 103 | } |
| 104 | |
| 105 | opt = 1; |
| 106 | oldfs = get_fs(); |
| 107 | set_fs(KERNEL_DS); |
| 108 | ret = trans->socket->ops->setsockopt(trans->socket, SOL_IP, IP_RECVERR, |
| 109 | (char *) &opt, sizeof(opt)); |
| 110 | set_fs(oldfs); |
| 111 | |
| 112 | spin_lock(&rxrpc_transports_lock); |
| 113 | list_add(&trans->link, &rxrpc_transports); |
| 114 | spin_unlock(&rxrpc_transports_lock); |
| 115 | |
| 116 | /* set the socket up */ |
| 117 | sock = trans->socket->sk; |
| 118 | sock->sk_user_data = trans; |
| 119 | sock->sk_data_ready = rxrpc_data_ready; |
| 120 | sock->sk_error_report = rxrpc_error_report; |
| 121 | |
| 122 | down_write(&rxrpc_proc_transports_sem); |
| 123 | list_add_tail(&trans->proc_link, &rxrpc_proc_transports); |
| 124 | up_write(&rxrpc_proc_transports_sem); |
| 125 | |
| 126 | __RXACCT(atomic_inc(&rxrpc_transport_count)); |
| 127 | |
| 128 | *_trans = trans; |
| 129 | _leave(" = 0 (%p)", trans); |
| 130 | return 0; |
| 131 | |
| 132 | error: |
| 133 | /* finish cleaning up the transport (not really needed here, but...) */ |
| 134 | if (trans->socket) |
| 135 | trans->socket->ops->shutdown(trans->socket, 2); |
| 136 | |
| 137 | /* close the socket */ |
| 138 | if (trans->socket) { |
| 139 | trans->socket->sk->sk_user_data = NULL; |
| 140 | sock_release(trans->socket); |
| 141 | trans->socket = NULL; |
| 142 | } |
| 143 | |
| 144 | kfree(trans); |
| 145 | |
| 146 | |
| 147 | _leave(" = %d", ret); |
| 148 | return ret; |
| 149 | } /* end rxrpc_create_transport() */ |
| 150 | |
| 151 | /*****************************************************************************/ |
| 152 | /* |
| 153 | * destroy a transport endpoint |
| 154 | */ |
| 155 | void rxrpc_put_transport(struct rxrpc_transport *trans) |
| 156 | { |
| 157 | _enter("%p{u=%d p=%hu}", |
| 158 | trans, atomic_read(&trans->usage), trans->port); |
| 159 | |
| 160 | BUG_ON(atomic_read(&trans->usage) <= 0); |
| 161 | |
| 162 | /* to prevent a race, the decrement and the dequeue must be |
| 163 | * effectively atomic */ |
| 164 | spin_lock(&rxrpc_transports_lock); |
| 165 | if (likely(!atomic_dec_and_test(&trans->usage))) { |
| 166 | spin_unlock(&rxrpc_transports_lock); |
| 167 | _leave(""); |
| 168 | return; |
| 169 | } |
| 170 | |
| 171 | list_del(&trans->link); |
| 172 | spin_unlock(&rxrpc_transports_lock); |
| 173 | |
| 174 | /* finish cleaning up the transport */ |
| 175 | if (trans->socket) |
| 176 | trans->socket->ops->shutdown(trans->socket, 2); |
| 177 | |
| 178 | rxrpc_krxsecd_clear_transport(trans); |
| 179 | rxrpc_krxiod_dequeue_transport(trans); |
| 180 | |
| 181 | /* discard all peer information */ |
| 182 | rxrpc_peer_clearall(trans); |
| 183 | |
| 184 | down_write(&rxrpc_proc_transports_sem); |
| 185 | list_del(&trans->proc_link); |
| 186 | up_write(&rxrpc_proc_transports_sem); |
| 187 | __RXACCT(atomic_dec(&rxrpc_transport_count)); |
| 188 | |
| 189 | /* close the socket */ |
| 190 | if (trans->socket) { |
| 191 | trans->socket->sk->sk_user_data = NULL; |
| 192 | sock_release(trans->socket); |
| 193 | trans->socket = NULL; |
| 194 | } |
| 195 | |
| 196 | kfree(trans); |
| 197 | |
| 198 | _leave(""); |
| 199 | } /* end rxrpc_put_transport() */ |
| 200 | |
| 201 | /*****************************************************************************/ |
| 202 | /* |
| 203 | * add a service to a transport to be listened upon |
| 204 | */ |
| 205 | int rxrpc_add_service(struct rxrpc_transport *trans, |
| 206 | struct rxrpc_service *newsrv) |
| 207 | { |
| 208 | struct rxrpc_service *srv; |
| 209 | struct list_head *_p; |
| 210 | int ret = -EEXIST; |
| 211 | |
| 212 | _enter("%p{%hu},%p{%hu}", |
| 213 | trans, trans->port, newsrv, newsrv->service_id); |
| 214 | |
| 215 | /* verify that the service ID is not already present */ |
| 216 | spin_lock(&trans->lock); |
| 217 | |
| 218 | list_for_each(_p, &trans->services) { |
| 219 | srv = list_entry(_p, struct rxrpc_service, link); |
| 220 | if (srv->service_id == newsrv->service_id) |
| 221 | goto out; |
| 222 | } |
| 223 | |
| 224 | /* okay - add the transport to the list */ |
| 225 | list_add_tail(&newsrv->link, &trans->services); |
| 226 | rxrpc_get_transport(trans); |
| 227 | ret = 0; |
| 228 | |
| 229 | out: |
| 230 | spin_unlock(&trans->lock); |
| 231 | |
| 232 | _leave("= %d", ret); |
| 233 | return ret; |
| 234 | } /* end rxrpc_add_service() */ |
| 235 | |
| 236 | /*****************************************************************************/ |
| 237 | /* |
| 238 | * remove a service from a transport |
| 239 | */ |
| 240 | void rxrpc_del_service(struct rxrpc_transport *trans, struct rxrpc_service *srv) |
| 241 | { |
| 242 | _enter("%p{%hu},%p{%hu}", trans, trans->port, srv, srv->service_id); |
| 243 | |
| 244 | spin_lock(&trans->lock); |
| 245 | list_del(&srv->link); |
| 246 | spin_unlock(&trans->lock); |
| 247 | |
| 248 | rxrpc_put_transport(trans); |
| 249 | |
| 250 | _leave(""); |
| 251 | } /* end rxrpc_del_service() */ |
| 252 | |
| 253 | /*****************************************************************************/ |
| 254 | /* |
| 255 | * INET callback when data has been received on the socket. |
| 256 | */ |
| 257 | static void rxrpc_data_ready(struct sock *sk, int count) |
| 258 | { |
| 259 | struct rxrpc_transport *trans; |
| 260 | |
| 261 | _enter("%p{t=%p},%d", sk, sk->sk_user_data, count); |
| 262 | |
| 263 | /* queue the transport for attention by krxiod */ |
| 264 | trans = (struct rxrpc_transport *) sk->sk_user_data; |
| 265 | if (trans) |
| 266 | rxrpc_krxiod_queue_transport(trans); |
| 267 | |
| 268 | /* wake up anyone waiting on the socket */ |
| 269 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
| 270 | wake_up_interruptible(sk->sk_sleep); |
| 271 | |
| 272 | _leave(""); |
| 273 | } /* end rxrpc_data_ready() */ |
| 274 | |
| 275 | /*****************************************************************************/ |
| 276 | /* |
| 277 | * INET callback when an ICMP error packet is received |
| 278 | * - sk->err is error (EHOSTUNREACH, EPROTO or EMSGSIZE) |
| 279 | */ |
| 280 | static void rxrpc_error_report(struct sock *sk) |
| 281 | { |
| 282 | struct rxrpc_transport *trans; |
| 283 | |
| 284 | _enter("%p{t=%p}", sk, sk->sk_user_data); |
| 285 | |
| 286 | /* queue the transport for attention by krxiod */ |
| 287 | trans = (struct rxrpc_transport *) sk->sk_user_data; |
| 288 | if (trans) { |
| 289 | trans->error_rcvd = 1; |
| 290 | rxrpc_krxiod_queue_transport(trans); |
| 291 | } |
| 292 | |
| 293 | /* wake up anyone waiting on the socket */ |
| 294 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
| 295 | wake_up_interruptible(sk->sk_sleep); |
| 296 | |
| 297 | _leave(""); |
| 298 | } /* end rxrpc_error_report() */ |
| 299 | |
| 300 | /*****************************************************************************/ |
| 301 | /* |
| 302 | * split a message up, allocating message records and filling them in |
| 303 | * from the contents of a socket buffer |
| 304 | */ |
| 305 | static int rxrpc_incoming_msg(struct rxrpc_transport *trans, |
| 306 | struct sk_buff *pkt, |
| 307 | struct list_head *msgq) |
| 308 | { |
| 309 | struct rxrpc_message *msg; |
| 310 | int ret; |
| 311 | |
| 312 | _enter(""); |
| 313 | |
| 314 | msg = kmalloc(sizeof(struct rxrpc_message), GFP_KERNEL); |
| 315 | if (!msg) { |
| 316 | _leave(" = -ENOMEM"); |
| 317 | return -ENOMEM; |
| 318 | } |
| 319 | |
| 320 | memset(msg, 0, sizeof(*msg)); |
| 321 | atomic_set(&msg->usage, 1); |
| 322 | list_add_tail(&msg->link,msgq); |
| 323 | |
| 324 | /* dig out the Rx routing parameters */ |
| 325 | if (skb_copy_bits(pkt, sizeof(struct udphdr), |
| 326 | &msg->hdr, sizeof(msg->hdr)) < 0) { |
| 327 | ret = -EBADMSG; |
| 328 | goto error; |
| 329 | } |
| 330 | |
| 331 | msg->trans = trans; |
| 332 | msg->state = RXRPC_MSG_RECEIVED; |
Andrew Morton | 9deff7f | 2005-08-15 21:13:25 -0700 | [diff] [blame] | 333 | skb_get_timestamp(pkt, &msg->stamp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | if (msg->stamp.tv_sec == 0) { |
| 335 | do_gettimeofday(&msg->stamp); |
| 336 | if (pkt->sk) |
| 337 | sock_enable_timestamp(pkt->sk); |
| 338 | } |
| 339 | msg->seq = ntohl(msg->hdr.seq); |
| 340 | |
| 341 | /* attach the packet */ |
| 342 | skb_get(pkt); |
| 343 | msg->pkt = pkt; |
| 344 | |
| 345 | msg->offset = sizeof(struct udphdr) + sizeof(struct rxrpc_header); |
| 346 | msg->dsize = msg->pkt->len - msg->offset; |
| 347 | |
| 348 | _net("Rx Received packet from %s (%08x;%08x,%1x,%d,%s,%02x,%d,%d)", |
| 349 | msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server", |
| 350 | ntohl(msg->hdr.epoch), |
| 351 | (ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT, |
| 352 | ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK, |
| 353 | ntohl(msg->hdr.callNumber), |
| 354 | rxrpc_pkts[msg->hdr.type], |
| 355 | msg->hdr.flags, |
| 356 | ntohs(msg->hdr.serviceId), |
| 357 | msg->hdr.securityIndex); |
| 358 | |
| 359 | __RXACCT(atomic_inc(&rxrpc_message_count)); |
| 360 | |
| 361 | /* split off jumbo packets */ |
| 362 | while (msg->hdr.type == RXRPC_PACKET_TYPE_DATA && |
| 363 | msg->hdr.flags & RXRPC_JUMBO_PACKET |
| 364 | ) { |
| 365 | struct rxrpc_jumbo_header jumbo; |
| 366 | struct rxrpc_message *jumbomsg = msg; |
| 367 | |
| 368 | _debug("split jumbo packet"); |
| 369 | |
| 370 | /* quick sanity check */ |
| 371 | ret = -EBADMSG; |
| 372 | if (msg->dsize < |
| 373 | RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header)) |
| 374 | goto error; |
| 375 | if (msg->hdr.flags & RXRPC_LAST_PACKET) |
| 376 | goto error; |
| 377 | |
| 378 | /* dig out the secondary header */ |
| 379 | if (skb_copy_bits(pkt, msg->offset + RXRPC_JUMBO_DATALEN, |
| 380 | &jumbo, sizeof(jumbo)) < 0) |
| 381 | goto error; |
| 382 | |
| 383 | /* allocate a new message record */ |
| 384 | ret = -ENOMEM; |
| 385 | msg = kmalloc(sizeof(struct rxrpc_message), GFP_KERNEL); |
| 386 | if (!msg) |
| 387 | goto error; |
| 388 | |
| 389 | memcpy(msg, jumbomsg, sizeof(*msg)); |
| 390 | list_add_tail(&msg->link, msgq); |
| 391 | |
| 392 | /* adjust the jumbo packet */ |
| 393 | jumbomsg->dsize = RXRPC_JUMBO_DATALEN; |
| 394 | |
| 395 | /* attach the packet here too */ |
| 396 | skb_get(pkt); |
| 397 | |
| 398 | /* adjust the parameters */ |
| 399 | msg->seq++; |
| 400 | msg->hdr.seq = htonl(msg->seq); |
| 401 | msg->hdr.serial = htonl(ntohl(msg->hdr.serial) + 1); |
| 402 | msg->offset += RXRPC_JUMBO_DATALEN + |
| 403 | sizeof(struct rxrpc_jumbo_header); |
| 404 | msg->dsize -= RXRPC_JUMBO_DATALEN + |
| 405 | sizeof(struct rxrpc_jumbo_header); |
| 406 | msg->hdr.flags = jumbo.flags; |
| 407 | msg->hdr._rsvd = jumbo._rsvd; |
| 408 | |
| 409 | _net("Rx Split jumbo packet from %s" |
| 410 | " (%08x;%08x,%1x,%d,%s,%02x,%d,%d)", |
| 411 | msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server", |
| 412 | ntohl(msg->hdr.epoch), |
| 413 | (ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT, |
| 414 | ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK, |
| 415 | ntohl(msg->hdr.callNumber), |
| 416 | rxrpc_pkts[msg->hdr.type], |
| 417 | msg->hdr.flags, |
| 418 | ntohs(msg->hdr.serviceId), |
| 419 | msg->hdr.securityIndex); |
| 420 | |
| 421 | __RXACCT(atomic_inc(&rxrpc_message_count)); |
| 422 | } |
| 423 | |
| 424 | _leave(" = 0 #%d", atomic_read(&rxrpc_message_count)); |
| 425 | return 0; |
| 426 | |
| 427 | error: |
| 428 | while (!list_empty(msgq)) { |
| 429 | msg = list_entry(msgq->next, struct rxrpc_message, link); |
| 430 | list_del_init(&msg->link); |
| 431 | |
| 432 | rxrpc_put_message(msg); |
| 433 | } |
| 434 | |
| 435 | _leave(" = %d", ret); |
| 436 | return ret; |
| 437 | } /* end rxrpc_incoming_msg() */ |
| 438 | |
| 439 | /*****************************************************************************/ |
| 440 | /* |
| 441 | * accept a new call |
| 442 | * - called from krxiod in process context |
| 443 | */ |
| 444 | void rxrpc_trans_receive_packet(struct rxrpc_transport *trans) |
| 445 | { |
| 446 | struct rxrpc_message *msg; |
| 447 | struct rxrpc_peer *peer; |
| 448 | struct sk_buff *pkt; |
| 449 | int ret; |
| 450 | __be32 addr; |
| 451 | __be16 port; |
| 452 | |
| 453 | LIST_HEAD(msgq); |
| 454 | |
| 455 | _enter("%p{%d}", trans, trans->port); |
| 456 | |
| 457 | for (;;) { |
| 458 | /* deal with outstanting errors first */ |
| 459 | if (trans->error_rcvd) |
| 460 | rxrpc_trans_receive_error_report(trans); |
| 461 | |
| 462 | /* attempt to receive a packet */ |
| 463 | pkt = skb_recv_datagram(trans->socket->sk, 0, 1, &ret); |
| 464 | if (!pkt) { |
| 465 | if (ret == -EAGAIN) { |
| 466 | _leave(" EAGAIN"); |
| 467 | return; |
| 468 | } |
| 469 | |
| 470 | /* an icmp error may have occurred */ |
| 471 | rxrpc_krxiod_queue_transport(trans); |
| 472 | _leave(" error %d\n", ret); |
| 473 | return; |
| 474 | } |
| 475 | |
| 476 | /* we'll probably need to checksum it (didn't call |
| 477 | * sock_recvmsg) */ |
| 478 | if (pkt->ip_summed != CHECKSUM_UNNECESSARY) { |
| 479 | if ((unsigned short) |
| 480 | csum_fold(skb_checksum(pkt, 0, pkt->len, |
| 481 | pkt->csum))) { |
| 482 | kfree_skb(pkt); |
| 483 | rxrpc_krxiod_queue_transport(trans); |
| 484 | _leave(" CSUM failed"); |
| 485 | return; |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | addr = pkt->nh.iph->saddr; |
| 490 | port = pkt->h.uh->source; |
| 491 | |
| 492 | _net("Rx Received UDP packet from %08x:%04hu", |
| 493 | ntohl(addr), ntohs(port)); |
| 494 | |
| 495 | /* unmarshall the Rx parameters and split jumbo packets */ |
| 496 | ret = rxrpc_incoming_msg(trans, pkt, &msgq); |
| 497 | if (ret < 0) { |
| 498 | kfree_skb(pkt); |
| 499 | rxrpc_krxiod_queue_transport(trans); |
| 500 | _leave(" bad packet"); |
| 501 | return; |
| 502 | } |
| 503 | |
| 504 | BUG_ON(list_empty(&msgq)); |
| 505 | |
| 506 | msg = list_entry(msgq.next, struct rxrpc_message, link); |
| 507 | |
| 508 | /* locate the record for the peer from which it |
| 509 | * originated */ |
| 510 | ret = rxrpc_peer_lookup(trans, addr, &peer); |
| 511 | if (ret < 0) { |
| 512 | kdebug("Rx No connections from that peer"); |
| 513 | rxrpc_trans_immediate_abort(trans, msg, -EINVAL); |
| 514 | goto finished_msg; |
| 515 | } |
| 516 | |
| 517 | /* try and find a matching connection */ |
| 518 | ret = rxrpc_connection_lookup(peer, msg, &msg->conn); |
| 519 | if (ret < 0) { |
| 520 | kdebug("Rx Unknown Connection"); |
| 521 | rxrpc_trans_immediate_abort(trans, msg, -EINVAL); |
| 522 | rxrpc_put_peer(peer); |
| 523 | goto finished_msg; |
| 524 | } |
| 525 | rxrpc_put_peer(peer); |
| 526 | |
| 527 | /* deal with the first packet of a new call */ |
| 528 | if (msg->hdr.flags & RXRPC_CLIENT_INITIATED && |
| 529 | msg->hdr.type == RXRPC_PACKET_TYPE_DATA && |
| 530 | ntohl(msg->hdr.seq) == 1 |
| 531 | ) { |
| 532 | _debug("Rx New server call"); |
| 533 | rxrpc_trans_receive_new_call(trans, &msgq); |
| 534 | goto finished_msg; |
| 535 | } |
| 536 | |
| 537 | /* deal with subsequent packet(s) of call */ |
| 538 | _debug("Rx Call packet"); |
| 539 | while (!list_empty(&msgq)) { |
| 540 | msg = list_entry(msgq.next, struct rxrpc_message, link); |
| 541 | list_del_init(&msg->link); |
| 542 | |
| 543 | ret = rxrpc_conn_receive_call_packet(msg->conn, NULL, msg); |
| 544 | if (ret < 0) { |
| 545 | rxrpc_trans_immediate_abort(trans, msg, ret); |
| 546 | rxrpc_put_message(msg); |
| 547 | goto finished_msg; |
| 548 | } |
| 549 | |
| 550 | rxrpc_put_message(msg); |
| 551 | } |
| 552 | |
| 553 | goto finished_msg; |
| 554 | |
| 555 | /* dispose of the packets */ |
| 556 | finished_msg: |
| 557 | while (!list_empty(&msgq)) { |
| 558 | msg = list_entry(msgq.next, struct rxrpc_message, link); |
| 559 | list_del_init(&msg->link); |
| 560 | |
| 561 | rxrpc_put_message(msg); |
| 562 | } |
| 563 | kfree_skb(pkt); |
| 564 | } |
| 565 | |
| 566 | _leave(""); |
| 567 | |
| 568 | } /* end rxrpc_trans_receive_packet() */ |
| 569 | |
| 570 | /*****************************************************************************/ |
| 571 | /* |
| 572 | * accept a new call from a client trying to connect to one of my services |
| 573 | * - called in process context |
| 574 | */ |
| 575 | static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans, |
| 576 | struct list_head *msgq) |
| 577 | { |
| 578 | struct rxrpc_message *msg; |
| 579 | |
| 580 | _enter(""); |
| 581 | |
| 582 | /* only bother with the first packet */ |
| 583 | msg = list_entry(msgq->next, struct rxrpc_message, link); |
| 584 | list_del_init(&msg->link); |
| 585 | rxrpc_krxsecd_queue_incoming_call(msg); |
| 586 | rxrpc_put_message(msg); |
| 587 | |
| 588 | _leave(" = 0"); |
| 589 | |
| 590 | return 0; |
| 591 | } /* end rxrpc_trans_receive_new_call() */ |
| 592 | |
| 593 | /*****************************************************************************/ |
| 594 | /* |
| 595 | * perform an immediate abort without connection or call structures |
| 596 | */ |
| 597 | int rxrpc_trans_immediate_abort(struct rxrpc_transport *trans, |
| 598 | struct rxrpc_message *msg, |
| 599 | int error) |
| 600 | { |
| 601 | struct rxrpc_header ahdr; |
| 602 | struct sockaddr_in sin; |
| 603 | struct msghdr msghdr; |
| 604 | struct kvec iov[2]; |
| 605 | __be32 _error; |
| 606 | int len, ret; |
| 607 | |
| 608 | _enter("%p,%p,%d", trans, msg, error); |
| 609 | |
| 610 | /* don't abort an abort packet */ |
| 611 | if (msg->hdr.type == RXRPC_PACKET_TYPE_ABORT) { |
| 612 | _leave(" = 0"); |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | _error = htonl(-error); |
| 617 | |
| 618 | /* set up the message to be transmitted */ |
| 619 | memcpy(&ahdr, &msg->hdr, sizeof(ahdr)); |
| 620 | ahdr.epoch = msg->hdr.epoch; |
| 621 | ahdr.serial = htonl(1); |
| 622 | ahdr.seq = 0; |
| 623 | ahdr.type = RXRPC_PACKET_TYPE_ABORT; |
| 624 | ahdr.flags = RXRPC_LAST_PACKET; |
| 625 | ahdr.flags |= ~msg->hdr.flags & RXRPC_CLIENT_INITIATED; |
| 626 | |
| 627 | iov[0].iov_len = sizeof(ahdr); |
| 628 | iov[0].iov_base = &ahdr; |
| 629 | iov[1].iov_len = sizeof(_error); |
| 630 | iov[1].iov_base = &_error; |
| 631 | |
| 632 | len = sizeof(ahdr) + sizeof(_error); |
| 633 | |
| 634 | memset(&sin,0,sizeof(sin)); |
| 635 | sin.sin_family = AF_INET; |
| 636 | sin.sin_port = msg->pkt->h.uh->source; |
| 637 | sin.sin_addr.s_addr = msg->pkt->nh.iph->saddr; |
| 638 | |
| 639 | msghdr.msg_name = &sin; |
| 640 | msghdr.msg_namelen = sizeof(sin); |
| 641 | msghdr.msg_control = NULL; |
| 642 | msghdr.msg_controllen = 0; |
| 643 | msghdr.msg_flags = MSG_DONTWAIT; |
| 644 | |
| 645 | _net("Sending message type %d of %d bytes to %08x:%d", |
| 646 | ahdr.type, |
| 647 | len, |
| 648 | ntohl(sin.sin_addr.s_addr), |
| 649 | ntohs(sin.sin_port)); |
| 650 | |
| 651 | /* send the message */ |
| 652 | ret = kernel_sendmsg(trans->socket, &msghdr, iov, 2, len); |
| 653 | |
| 654 | _leave(" = %d", ret); |
| 655 | return ret; |
| 656 | } /* end rxrpc_trans_immediate_abort() */ |
| 657 | |
| 658 | /*****************************************************************************/ |
| 659 | /* |
| 660 | * receive an ICMP error report and percolate it to all connections |
| 661 | * heading to the affected host or port |
| 662 | */ |
| 663 | static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans) |
| 664 | { |
| 665 | struct rxrpc_connection *conn; |
| 666 | struct sockaddr_in sin; |
| 667 | struct rxrpc_peer *peer; |
| 668 | struct list_head connq, *_p; |
| 669 | struct errormsg emsg; |
| 670 | struct msghdr msg; |
| 671 | __be16 port; |
| 672 | int local, err; |
| 673 | |
| 674 | _enter("%p", trans); |
| 675 | |
| 676 | for (;;) { |
| 677 | trans->error_rcvd = 0; |
| 678 | |
| 679 | /* try and receive an error message */ |
| 680 | msg.msg_name = &sin; |
| 681 | msg.msg_namelen = sizeof(sin); |
| 682 | msg.msg_control = &emsg; |
| 683 | msg.msg_controllen = sizeof(emsg); |
| 684 | msg.msg_flags = 0; |
| 685 | |
| 686 | err = kernel_recvmsg(trans->socket, &msg, NULL, 0, 0, |
| 687 | MSG_ERRQUEUE | MSG_DONTWAIT | MSG_TRUNC); |
| 688 | |
| 689 | if (err == -EAGAIN) { |
| 690 | _leave(""); |
| 691 | return; |
| 692 | } |
| 693 | |
| 694 | if (err < 0) { |
| 695 | printk("%s: unable to recv an error report: %d\n", |
| 696 | __FUNCTION__, err); |
| 697 | _leave(""); |
| 698 | return; |
| 699 | } |
| 700 | |
| 701 | msg.msg_controllen = (char *) msg.msg_control - (char *) &emsg; |
| 702 | |
| 703 | if (msg.msg_controllen < sizeof(emsg.cmsg) || |
| 704 | msg.msg_namelen < sizeof(sin)) { |
| 705 | printk("%s: short control message" |
| 706 | " (nlen=%u clen=%Zu fl=%x)\n", |
| 707 | __FUNCTION__, |
| 708 | msg.msg_namelen, |
| 709 | msg.msg_controllen, |
| 710 | msg.msg_flags); |
| 711 | continue; |
| 712 | } |
| 713 | |
| 714 | _net("Rx Received control message" |
| 715 | " { len=%Zu level=%u type=%u }", |
| 716 | emsg.cmsg.cmsg_len, |
| 717 | emsg.cmsg.cmsg_level, |
| 718 | emsg.cmsg.cmsg_type); |
| 719 | |
| 720 | if (sin.sin_family != AF_INET) { |
| 721 | printk("Rx Ignoring error report with non-INET address" |
| 722 | " (fam=%u)", |
| 723 | sin.sin_family); |
| 724 | continue; |
| 725 | } |
| 726 | |
| 727 | _net("Rx Received message pertaining to host addr=%x port=%hu", |
| 728 | ntohl(sin.sin_addr.s_addr), ntohs(sin.sin_port)); |
| 729 | |
| 730 | if (emsg.cmsg.cmsg_level != SOL_IP || |
| 731 | emsg.cmsg.cmsg_type != IP_RECVERR) { |
| 732 | printk("Rx Ignoring unknown error report" |
| 733 | " { level=%u type=%u }", |
| 734 | emsg.cmsg.cmsg_level, |
| 735 | emsg.cmsg.cmsg_type); |
| 736 | continue; |
| 737 | } |
| 738 | |
| 739 | if (msg.msg_controllen < sizeof(emsg.cmsg) + sizeof(emsg.ee)) { |
| 740 | printk("%s: short error message (%Zu)\n", |
| 741 | __FUNCTION__, msg.msg_controllen); |
| 742 | _leave(""); |
| 743 | return; |
| 744 | } |
| 745 | |
| 746 | port = sin.sin_port; |
| 747 | |
| 748 | switch (emsg.ee.ee_origin) { |
| 749 | case SO_EE_ORIGIN_ICMP: |
| 750 | local = 0; |
| 751 | switch (emsg.ee.ee_type) { |
| 752 | case ICMP_DEST_UNREACH: |
| 753 | switch (emsg.ee.ee_code) { |
| 754 | case ICMP_NET_UNREACH: |
| 755 | _net("Rx Received ICMP Network Unreachable"); |
| 756 | port = 0; |
| 757 | err = -ENETUNREACH; |
| 758 | break; |
| 759 | case ICMP_HOST_UNREACH: |
| 760 | _net("Rx Received ICMP Host Unreachable"); |
| 761 | port = 0; |
| 762 | err = -EHOSTUNREACH; |
| 763 | break; |
| 764 | case ICMP_PORT_UNREACH: |
| 765 | _net("Rx Received ICMP Port Unreachable"); |
| 766 | err = -ECONNREFUSED; |
| 767 | break; |
| 768 | case ICMP_NET_UNKNOWN: |
| 769 | _net("Rx Received ICMP Unknown Network"); |
| 770 | port = 0; |
| 771 | err = -ENETUNREACH; |
| 772 | break; |
| 773 | case ICMP_HOST_UNKNOWN: |
| 774 | _net("Rx Received ICMP Unknown Host"); |
| 775 | port = 0; |
| 776 | err = -EHOSTUNREACH; |
| 777 | break; |
| 778 | default: |
| 779 | _net("Rx Received ICMP DestUnreach { code=%u }", |
| 780 | emsg.ee.ee_code); |
| 781 | err = emsg.ee.ee_errno; |
| 782 | break; |
| 783 | } |
| 784 | break; |
| 785 | |
| 786 | case ICMP_TIME_EXCEEDED: |
| 787 | _net("Rx Received ICMP TTL Exceeded"); |
| 788 | err = emsg.ee.ee_errno; |
| 789 | break; |
| 790 | |
| 791 | default: |
| 792 | _proto("Rx Received ICMP error { type=%u code=%u }", |
| 793 | emsg.ee.ee_type, emsg.ee.ee_code); |
| 794 | err = emsg.ee.ee_errno; |
| 795 | break; |
| 796 | } |
| 797 | break; |
| 798 | |
| 799 | case SO_EE_ORIGIN_LOCAL: |
| 800 | _proto("Rx Received local error { error=%d }", |
| 801 | emsg.ee.ee_errno); |
| 802 | local = 1; |
| 803 | err = emsg.ee.ee_errno; |
| 804 | break; |
| 805 | |
| 806 | case SO_EE_ORIGIN_NONE: |
| 807 | case SO_EE_ORIGIN_ICMP6: |
| 808 | default: |
| 809 | _proto("Rx Received error report { orig=%u }", |
| 810 | emsg.ee.ee_origin); |
| 811 | local = 0; |
| 812 | err = emsg.ee.ee_errno; |
| 813 | break; |
| 814 | } |
| 815 | |
| 816 | /* find all the connections between this transport and the |
| 817 | * affected destination */ |
| 818 | INIT_LIST_HEAD(&connq); |
| 819 | |
| 820 | if (rxrpc_peer_lookup(trans, sin.sin_addr.s_addr, |
| 821 | &peer) == 0) { |
| 822 | read_lock(&peer->conn_lock); |
| 823 | list_for_each(_p, &peer->conn_active) { |
| 824 | conn = list_entry(_p, struct rxrpc_connection, |
| 825 | link); |
| 826 | if (port && conn->addr.sin_port != port) |
| 827 | continue; |
| 828 | if (!list_empty(&conn->err_link)) |
| 829 | continue; |
| 830 | |
| 831 | rxrpc_get_connection(conn); |
| 832 | list_add_tail(&conn->err_link, &connq); |
| 833 | } |
| 834 | read_unlock(&peer->conn_lock); |
| 835 | |
| 836 | /* service all those connections */ |
| 837 | while (!list_empty(&connq)) { |
| 838 | conn = list_entry(connq.next, |
| 839 | struct rxrpc_connection, |
| 840 | err_link); |
| 841 | list_del(&conn->err_link); |
| 842 | |
| 843 | rxrpc_conn_handle_error(conn, local, err); |
| 844 | |
| 845 | rxrpc_put_connection(conn); |
| 846 | } |
| 847 | |
| 848 | rxrpc_put_peer(peer); |
| 849 | } |
| 850 | } |
| 851 | |
| 852 | _leave(""); |
| 853 | return; |
| 854 | } /* end rxrpc_trans_receive_error_report() */ |