| 1 | /* |
| 2 | * common UDP/RAW code |
| 3 | * Linux INET6 implementation |
| 4 | * |
| 5 | * Authors: |
| 6 | * Pedro Roque <roque@di.fc.ul.pt> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/capability.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/interrupt.h> |
| 19 | #include <linux/socket.h> |
| 20 | #include <linux/sockios.h> |
| 21 | #include <linux/in6.h> |
| 22 | #include <linux/ipv6.h> |
| 23 | #include <linux/route.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/export.h> |
| 26 | |
| 27 | #include <net/ipv6.h> |
| 28 | #include <net/ndisc.h> |
| 29 | #include <net/addrconf.h> |
| 30 | #include <net/transp_v6.h> |
| 31 | #include <net/ip6_route.h> |
| 32 | #include <net/tcp_states.h> |
| 33 | #include <net/dsfield.h> |
| 34 | |
| 35 | #include <linux/errqueue.h> |
| 36 | #include <asm/uaccess.h> |
| 37 | |
| 38 | static bool ipv6_mapped_addr_any(const struct in6_addr *a) |
| 39 | { |
| 40 | return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); |
| 41 | } |
| 42 | |
| 43 | int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| 44 | { |
| 45 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; |
| 46 | struct inet_sock *inet = inet_sk(sk); |
| 47 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 48 | struct in6_addr *daddr, *final_p, final; |
| 49 | struct dst_entry *dst; |
| 50 | struct flowi6 fl6; |
| 51 | struct ip6_flowlabel *flowlabel = NULL; |
| 52 | struct ipv6_txoptions *opt; |
| 53 | int addr_type; |
| 54 | int err; |
| 55 | |
| 56 | if (usin->sin6_family == AF_INET) { |
| 57 | if (__ipv6_only_sock(sk)) |
| 58 | return -EAFNOSUPPORT; |
| 59 | err = ip4_datagram_connect(sk, uaddr, addr_len); |
| 60 | goto ipv4_connected; |
| 61 | } |
| 62 | |
| 63 | if (addr_len < SIN6_LEN_RFC2133) |
| 64 | return -EINVAL; |
| 65 | |
| 66 | if (usin->sin6_family != AF_INET6) |
| 67 | return -EAFNOSUPPORT; |
| 68 | |
| 69 | memset(&fl6, 0, sizeof(fl6)); |
| 70 | if (np->sndflow) { |
| 71 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| 72 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { |
| 73 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
| 74 | if (flowlabel == NULL) |
| 75 | return -EINVAL; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | addr_type = ipv6_addr_type(&usin->sin6_addr); |
| 80 | |
| 81 | if (addr_type == IPV6_ADDR_ANY) { |
| 82 | /* |
| 83 | * connect to self |
| 84 | */ |
| 85 | usin->sin6_addr.s6_addr[15] = 0x01; |
| 86 | } |
| 87 | |
| 88 | daddr = &usin->sin6_addr; |
| 89 | |
| 90 | if (addr_type == IPV6_ADDR_MAPPED) { |
| 91 | struct sockaddr_in sin; |
| 92 | |
| 93 | if (__ipv6_only_sock(sk)) { |
| 94 | err = -ENETUNREACH; |
| 95 | goto out; |
| 96 | } |
| 97 | sin.sin_family = AF_INET; |
| 98 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
| 99 | sin.sin_port = usin->sin6_port; |
| 100 | |
| 101 | err = ip4_datagram_connect(sk, |
| 102 | (struct sockaddr *) &sin, |
| 103 | sizeof(sin)); |
| 104 | |
| 105 | ipv4_connected: |
| 106 | if (err) |
| 107 | goto out; |
| 108 | |
| 109 | ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); |
| 110 | |
| 111 | if (ipv6_addr_any(&np->saddr) || |
| 112 | ipv6_mapped_addr_any(&np->saddr)) |
| 113 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
| 114 | |
| 115 | if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || |
| 116 | ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { |
| 117 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, |
| 118 | &sk->sk_v6_rcv_saddr); |
| 119 | if (sk->sk_prot->rehash) |
| 120 | sk->sk_prot->rehash(sk); |
| 121 | } |
| 122 | |
| 123 | goto out; |
| 124 | } |
| 125 | |
| 126 | if (__ipv6_addr_needs_scope_id(addr_type)) { |
| 127 | if (addr_len >= sizeof(struct sockaddr_in6) && |
| 128 | usin->sin6_scope_id) { |
| 129 | if (sk->sk_bound_dev_if && |
| 130 | sk->sk_bound_dev_if != usin->sin6_scope_id) { |
| 131 | err = -EINVAL; |
| 132 | goto out; |
| 133 | } |
| 134 | sk->sk_bound_dev_if = usin->sin6_scope_id; |
| 135 | } |
| 136 | |
| 137 | if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) |
| 138 | sk->sk_bound_dev_if = np->mcast_oif; |
| 139 | |
| 140 | /* Connect to link-local address requires an interface */ |
| 141 | if (!sk->sk_bound_dev_if) { |
| 142 | err = -EINVAL; |
| 143 | goto out; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | sk->sk_v6_daddr = *daddr; |
| 148 | np->flow_label = fl6.flowlabel; |
| 149 | |
| 150 | inet->inet_dport = usin->sin6_port; |
| 151 | |
| 152 | /* |
| 153 | * Check for a route to destination an obtain the |
| 154 | * destination cache for it. |
| 155 | */ |
| 156 | |
| 157 | fl6.flowi6_proto = sk->sk_protocol; |
| 158 | fl6.daddr = sk->sk_v6_daddr; |
| 159 | fl6.saddr = np->saddr; |
| 160 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
| 161 | fl6.flowi6_mark = sk->sk_mark; |
| 162 | fl6.fl6_dport = inet->inet_dport; |
| 163 | fl6.fl6_sport = inet->inet_sport; |
| 164 | |
| 165 | if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) |
| 166 | fl6.flowi6_oif = np->mcast_oif; |
| 167 | |
| 168 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
| 169 | |
| 170 | opt = flowlabel ? flowlabel->opt : np->opt; |
| 171 | final_p = fl6_update_dst(&fl6, opt, &final); |
| 172 | |
| 173 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
| 174 | err = 0; |
| 175 | if (IS_ERR(dst)) { |
| 176 | err = PTR_ERR(dst); |
| 177 | goto out; |
| 178 | } |
| 179 | |
| 180 | /* source address lookup done in ip6_dst_lookup */ |
| 181 | |
| 182 | if (ipv6_addr_any(&np->saddr)) |
| 183 | np->saddr = fl6.saddr; |
| 184 | |
| 185 | if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
| 186 | sk->sk_v6_rcv_saddr = fl6.saddr; |
| 187 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
| 188 | if (sk->sk_prot->rehash) |
| 189 | sk->sk_prot->rehash(sk); |
| 190 | } |
| 191 | |
| 192 | ip6_dst_store(sk, dst, |
| 193 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
| 194 | &sk->sk_v6_daddr : NULL, |
| 195 | #ifdef CONFIG_IPV6_SUBTREES |
| 196 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
| 197 | &np->saddr : |
| 198 | #endif |
| 199 | NULL); |
| 200 | |
| 201 | sk->sk_state = TCP_ESTABLISHED; |
| 202 | ip6_set_txhash(sk); |
| 203 | out: |
| 204 | fl6_sock_release(flowlabel); |
| 205 | return err; |
| 206 | } |
| 207 | EXPORT_SYMBOL_GPL(ip6_datagram_connect); |
| 208 | |
| 209 | int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, |
| 210 | int addr_len) |
| 211 | { |
| 212 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); |
| 213 | if (sin6->sin6_family != AF_INET6) |
| 214 | return -EAFNOSUPPORT; |
| 215 | return ip6_datagram_connect(sk, uaddr, addr_len); |
| 216 | } |
| 217 | EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); |
| 218 | |
| 219 | void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
| 220 | __be16 port, u32 info, u8 *payload) |
| 221 | { |
| 222 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 223 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
| 224 | struct sock_exterr_skb *serr; |
| 225 | |
| 226 | if (!np->recverr) |
| 227 | return; |
| 228 | |
| 229 | skb = skb_clone(skb, GFP_ATOMIC); |
| 230 | if (!skb) |
| 231 | return; |
| 232 | |
| 233 | skb->protocol = htons(ETH_P_IPV6); |
| 234 | |
| 235 | serr = SKB_EXT_ERR(skb); |
| 236 | serr->ee.ee_errno = err; |
| 237 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; |
| 238 | serr->ee.ee_type = icmph->icmp6_type; |
| 239 | serr->ee.ee_code = icmph->icmp6_code; |
| 240 | serr->ee.ee_pad = 0; |
| 241 | serr->ee.ee_info = info; |
| 242 | serr->ee.ee_data = 0; |
| 243 | serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - |
| 244 | skb_network_header(skb); |
| 245 | serr->port = port; |
| 246 | |
| 247 | __skb_pull(skb, payload - skb->data); |
| 248 | skb_reset_transport_header(skb); |
| 249 | |
| 250 | if (sock_queue_err_skb(sk, skb)) |
| 251 | kfree_skb(skb); |
| 252 | } |
| 253 | |
| 254 | void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) |
| 255 | { |
| 256 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 257 | struct sock_exterr_skb *serr; |
| 258 | struct ipv6hdr *iph; |
| 259 | struct sk_buff *skb; |
| 260 | |
| 261 | if (!np->recverr) |
| 262 | return; |
| 263 | |
| 264 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); |
| 265 | if (!skb) |
| 266 | return; |
| 267 | |
| 268 | skb->protocol = htons(ETH_P_IPV6); |
| 269 | |
| 270 | skb_put(skb, sizeof(struct ipv6hdr)); |
| 271 | skb_reset_network_header(skb); |
| 272 | iph = ipv6_hdr(skb); |
| 273 | iph->daddr = fl6->daddr; |
| 274 | |
| 275 | serr = SKB_EXT_ERR(skb); |
| 276 | serr->ee.ee_errno = err; |
| 277 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; |
| 278 | serr->ee.ee_type = 0; |
| 279 | serr->ee.ee_code = 0; |
| 280 | serr->ee.ee_pad = 0; |
| 281 | serr->ee.ee_info = info; |
| 282 | serr->ee.ee_data = 0; |
| 283 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
| 284 | serr->port = fl6->fl6_dport; |
| 285 | |
| 286 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
| 287 | skb_reset_transport_header(skb); |
| 288 | |
| 289 | if (sock_queue_err_skb(sk, skb)) |
| 290 | kfree_skb(skb); |
| 291 | } |
| 292 | |
| 293 | void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) |
| 294 | { |
| 295 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 296 | struct ipv6hdr *iph; |
| 297 | struct sk_buff *skb; |
| 298 | struct ip6_mtuinfo *mtu_info; |
| 299 | |
| 300 | if (!np->rxopt.bits.rxpmtu) |
| 301 | return; |
| 302 | |
| 303 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); |
| 304 | if (!skb) |
| 305 | return; |
| 306 | |
| 307 | skb_put(skb, sizeof(struct ipv6hdr)); |
| 308 | skb_reset_network_header(skb); |
| 309 | iph = ipv6_hdr(skb); |
| 310 | iph->daddr = fl6->daddr; |
| 311 | |
| 312 | mtu_info = IP6CBMTU(skb); |
| 313 | |
| 314 | mtu_info->ip6m_mtu = mtu; |
| 315 | mtu_info->ip6m_addr.sin6_family = AF_INET6; |
| 316 | mtu_info->ip6m_addr.sin6_port = 0; |
| 317 | mtu_info->ip6m_addr.sin6_flowinfo = 0; |
| 318 | mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; |
| 319 | mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; |
| 320 | |
| 321 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
| 322 | skb_reset_transport_header(skb); |
| 323 | |
| 324 | skb = xchg(&np->rxpmtu, skb); |
| 325 | kfree_skb(skb); |
| 326 | } |
| 327 | |
| 328 | static void ip6_datagram_prepare_pktinfo_errqueue(struct sk_buff *skb) |
| 329 | { |
| 330 | int ifindex = skb->dev ? skb->dev->ifindex : -1; |
| 331 | |
| 332 | if (skb->protocol == htons(ETH_P_IPV6)) |
| 333 | IP6CB(skb)->iif = ifindex; |
| 334 | else |
| 335 | PKTINFO_SKB_CB(skb)->ipi_ifindex = ifindex; |
| 336 | } |
| 337 | |
| 338 | /* |
| 339 | * Handle MSG_ERRQUEUE |
| 340 | */ |
| 341 | int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
| 342 | { |
| 343 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 344 | struct sock_exterr_skb *serr; |
| 345 | struct sk_buff *skb; |
| 346 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); |
| 347 | struct { |
| 348 | struct sock_extended_err ee; |
| 349 | struct sockaddr_in6 offender; |
| 350 | } errhdr; |
| 351 | int err; |
| 352 | int copied; |
| 353 | |
| 354 | err = -EAGAIN; |
| 355 | skb = sock_dequeue_err_skb(sk); |
| 356 | if (skb == NULL) |
| 357 | goto out; |
| 358 | |
| 359 | copied = skb->len; |
| 360 | if (copied > len) { |
| 361 | msg->msg_flags |= MSG_TRUNC; |
| 362 | copied = len; |
| 363 | } |
| 364 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
| 365 | if (err) |
| 366 | goto out_free_skb; |
| 367 | |
| 368 | sock_recv_timestamp(msg, sk, skb); |
| 369 | |
| 370 | serr = SKB_EXT_ERR(skb); |
| 371 | |
| 372 | if (sin) { |
| 373 | const unsigned char *nh = skb_network_header(skb); |
| 374 | sin->sin6_family = AF_INET6; |
| 375 | sin->sin6_flowinfo = 0; |
| 376 | sin->sin6_port = serr->port; |
| 377 | if (skb->protocol == htons(ETH_P_IPV6)) { |
| 378 | const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), |
| 379 | struct ipv6hdr, daddr); |
| 380 | sin->sin6_addr = ip6h->daddr; |
| 381 | if (np->sndflow) |
| 382 | sin->sin6_flowinfo = ip6_flowinfo(ip6h); |
| 383 | sin->sin6_scope_id = |
| 384 | ipv6_iface_scope_id(&sin->sin6_addr, |
| 385 | IP6CB(skb)->iif); |
| 386 | } else { |
| 387 | ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), |
| 388 | &sin->sin6_addr); |
| 389 | sin->sin6_scope_id = 0; |
| 390 | } |
| 391 | *addr_len = sizeof(*sin); |
| 392 | } |
| 393 | |
| 394 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); |
| 395 | sin = &errhdr.offender; |
| 396 | sin->sin6_family = AF_UNSPEC; |
| 397 | if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { |
| 398 | sin->sin6_family = AF_INET6; |
| 399 | sin->sin6_flowinfo = 0; |
| 400 | sin->sin6_port = 0; |
| 401 | if (np->rxopt.all) { |
| 402 | if (serr->ee.ee_origin != SO_EE_ORIGIN_ICMP && |
| 403 | serr->ee.ee_origin != SO_EE_ORIGIN_ICMP6) |
| 404 | ip6_datagram_prepare_pktinfo_errqueue(skb); |
| 405 | ip6_datagram_recv_common_ctl(sk, msg, skb); |
| 406 | } |
| 407 | if (skb->protocol == htons(ETH_P_IPV6)) { |
| 408 | sin->sin6_addr = ipv6_hdr(skb)->saddr; |
| 409 | if (np->rxopt.all) |
| 410 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
| 411 | sin->sin6_scope_id = |
| 412 | ipv6_iface_scope_id(&sin->sin6_addr, |
| 413 | IP6CB(skb)->iif); |
| 414 | } else { |
| 415 | struct inet_sock *inet = inet_sk(sk); |
| 416 | |
| 417 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
| 418 | &sin->sin6_addr); |
| 419 | sin->sin6_scope_id = 0; |
| 420 | if (inet->cmsg_flags) |
| 421 | ip_cmsg_recv(msg, skb); |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); |
| 426 | |
| 427 | /* Now we could try to dump offended packet options */ |
| 428 | |
| 429 | msg->msg_flags |= MSG_ERRQUEUE; |
| 430 | err = copied; |
| 431 | |
| 432 | out_free_skb: |
| 433 | kfree_skb(skb); |
| 434 | out: |
| 435 | return err; |
| 436 | } |
| 437 | EXPORT_SYMBOL_GPL(ipv6_recv_error); |
| 438 | |
| 439 | /* |
| 440 | * Handle IPV6_RECVPATHMTU |
| 441 | */ |
| 442 | int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, |
| 443 | int *addr_len) |
| 444 | { |
| 445 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 446 | struct sk_buff *skb; |
| 447 | struct ip6_mtuinfo mtu_info; |
| 448 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); |
| 449 | int err; |
| 450 | int copied; |
| 451 | |
| 452 | err = -EAGAIN; |
| 453 | skb = xchg(&np->rxpmtu, NULL); |
| 454 | if (skb == NULL) |
| 455 | goto out; |
| 456 | |
| 457 | copied = skb->len; |
| 458 | if (copied > len) { |
| 459 | msg->msg_flags |= MSG_TRUNC; |
| 460 | copied = len; |
| 461 | } |
| 462 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
| 463 | if (err) |
| 464 | goto out_free_skb; |
| 465 | |
| 466 | sock_recv_timestamp(msg, sk, skb); |
| 467 | |
| 468 | memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); |
| 469 | |
| 470 | if (sin) { |
| 471 | sin->sin6_family = AF_INET6; |
| 472 | sin->sin6_flowinfo = 0; |
| 473 | sin->sin6_port = 0; |
| 474 | sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; |
| 475 | sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; |
| 476 | *addr_len = sizeof(*sin); |
| 477 | } |
| 478 | |
| 479 | put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); |
| 480 | |
| 481 | err = copied; |
| 482 | |
| 483 | out_free_skb: |
| 484 | kfree_skb(skb); |
| 485 | out: |
| 486 | return err; |
| 487 | } |
| 488 | |
| 489 | |
| 490 | void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, |
| 491 | struct sk_buff *skb) |
| 492 | { |
| 493 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 494 | bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); |
| 495 | |
| 496 | if (np->rxopt.bits.rxinfo) { |
| 497 | struct in6_pktinfo src_info; |
| 498 | |
| 499 | if (is_ipv6) { |
| 500 | src_info.ipi6_ifindex = IP6CB(skb)->iif; |
| 501 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; |
| 502 | } else { |
| 503 | src_info.ipi6_ifindex = |
| 504 | PKTINFO_SKB_CB(skb)->ipi_ifindex; |
| 505 | ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, |
| 506 | &src_info.ipi6_addr); |
| 507 | } |
| 508 | |
| 509 | if (src_info.ipi6_ifindex >= 0) |
| 510 | put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, |
| 511 | sizeof(src_info), &src_info); |
| 512 | } |
| 513 | } |
| 514 | |
| 515 | void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, |
| 516 | struct sk_buff *skb) |
| 517 | { |
| 518 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 519 | struct inet6_skb_parm *opt = IP6CB(skb); |
| 520 | unsigned char *nh = skb_network_header(skb); |
| 521 | |
| 522 | if (np->rxopt.bits.rxhlim) { |
| 523 | int hlim = ipv6_hdr(skb)->hop_limit; |
| 524 | put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); |
| 525 | } |
| 526 | |
| 527 | if (np->rxopt.bits.rxtclass) { |
| 528 | int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
| 529 | put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); |
| 530 | } |
| 531 | |
| 532 | if (np->rxopt.bits.rxflow) { |
| 533 | __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); |
| 534 | if (flowinfo) |
| 535 | put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); |
| 536 | } |
| 537 | |
| 538 | /* HbH is allowed only once */ |
| 539 | if (np->rxopt.bits.hopopts && opt->hop) { |
| 540 | u8 *ptr = nh + opt->hop; |
| 541 | put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); |
| 542 | } |
| 543 | |
| 544 | if (opt->lastopt && |
| 545 | (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { |
| 546 | /* |
| 547 | * Silly enough, but we need to reparse in order to |
| 548 | * report extension headers (except for HbH) |
| 549 | * in order. |
| 550 | * |
| 551 | * Also note that IPV6_RECVRTHDRDSTOPTS is NOT |
| 552 | * (and WILL NOT be) defined because |
| 553 | * IPV6_RECVDSTOPTS is more generic. --yoshfuji |
| 554 | */ |
| 555 | unsigned int off = sizeof(struct ipv6hdr); |
| 556 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
| 557 | |
| 558 | while (off <= opt->lastopt) { |
| 559 | unsigned int len; |
| 560 | u8 *ptr = nh + off; |
| 561 | |
| 562 | switch (nexthdr) { |
| 563 | case IPPROTO_DSTOPTS: |
| 564 | nexthdr = ptr[0]; |
| 565 | len = (ptr[1] + 1) << 3; |
| 566 | if (np->rxopt.bits.dstopts) |
| 567 | put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); |
| 568 | break; |
| 569 | case IPPROTO_ROUTING: |
| 570 | nexthdr = ptr[0]; |
| 571 | len = (ptr[1] + 1) << 3; |
| 572 | if (np->rxopt.bits.srcrt) |
| 573 | put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); |
| 574 | break; |
| 575 | case IPPROTO_AH: |
| 576 | nexthdr = ptr[0]; |
| 577 | len = (ptr[1] + 2) << 2; |
| 578 | break; |
| 579 | default: |
| 580 | nexthdr = ptr[0]; |
| 581 | len = (ptr[1] + 1) << 3; |
| 582 | break; |
| 583 | } |
| 584 | |
| 585 | off += len; |
| 586 | } |
| 587 | } |
| 588 | |
| 589 | /* socket options in old style */ |
| 590 | if (np->rxopt.bits.rxoinfo) { |
| 591 | struct in6_pktinfo src_info; |
| 592 | |
| 593 | src_info.ipi6_ifindex = opt->iif; |
| 594 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; |
| 595 | put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); |
| 596 | } |
| 597 | if (np->rxopt.bits.rxohlim) { |
| 598 | int hlim = ipv6_hdr(skb)->hop_limit; |
| 599 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); |
| 600 | } |
| 601 | if (np->rxopt.bits.ohopopts && opt->hop) { |
| 602 | u8 *ptr = nh + opt->hop; |
| 603 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); |
| 604 | } |
| 605 | if (np->rxopt.bits.odstopts && opt->dst0) { |
| 606 | u8 *ptr = nh + opt->dst0; |
| 607 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
| 608 | } |
| 609 | if (np->rxopt.bits.osrcrt && opt->srcrt) { |
| 610 | struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); |
| 611 | put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); |
| 612 | } |
| 613 | if (np->rxopt.bits.odstopts && opt->dst1) { |
| 614 | u8 *ptr = nh + opt->dst1; |
| 615 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
| 616 | } |
| 617 | if (np->rxopt.bits.rxorigdstaddr) { |
| 618 | struct sockaddr_in6 sin6; |
| 619 | __be16 *ports = (__be16 *) skb_transport_header(skb); |
| 620 | |
| 621 | if (skb_transport_offset(skb) + 4 <= skb->len) { |
| 622 | /* All current transport protocols have the port numbers in the |
| 623 | * first four bytes of the transport header and this function is |
| 624 | * written with this assumption in mind. |
| 625 | */ |
| 626 | |
| 627 | sin6.sin6_family = AF_INET6; |
| 628 | sin6.sin6_addr = ipv6_hdr(skb)->daddr; |
| 629 | sin6.sin6_port = ports[1]; |
| 630 | sin6.sin6_flowinfo = 0; |
| 631 | sin6.sin6_scope_id = |
| 632 | ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, |
| 633 | opt->iif); |
| 634 | |
| 635 | put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); |
| 636 | } |
| 637 | } |
| 638 | } |
| 639 | |
| 640 | void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, |
| 641 | struct sk_buff *skb) |
| 642 | { |
| 643 | ip6_datagram_recv_common_ctl(sk, msg, skb); |
| 644 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
| 645 | } |
| 646 | EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); |
| 647 | |
| 648 | int ip6_datagram_send_ctl(struct net *net, struct sock *sk, |
| 649 | struct msghdr *msg, struct flowi6 *fl6, |
| 650 | struct ipv6_txoptions *opt, |
| 651 | int *hlimit, int *tclass, int *dontfrag) |
| 652 | { |
| 653 | struct in6_pktinfo *src_info; |
| 654 | struct cmsghdr *cmsg; |
| 655 | struct ipv6_rt_hdr *rthdr; |
| 656 | struct ipv6_opt_hdr *hdr; |
| 657 | int len; |
| 658 | int err = 0; |
| 659 | |
| 660 | for_each_cmsghdr(cmsg, msg) { |
| 661 | int addr_type; |
| 662 | |
| 663 | if (!CMSG_OK(msg, cmsg)) { |
| 664 | err = -EINVAL; |
| 665 | goto exit_f; |
| 666 | } |
| 667 | |
| 668 | if (cmsg->cmsg_level != SOL_IPV6) |
| 669 | continue; |
| 670 | |
| 671 | switch (cmsg->cmsg_type) { |
| 672 | case IPV6_PKTINFO: |
| 673 | case IPV6_2292PKTINFO: |
| 674 | { |
| 675 | struct net_device *dev = NULL; |
| 676 | |
| 677 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { |
| 678 | err = -EINVAL; |
| 679 | goto exit_f; |
| 680 | } |
| 681 | |
| 682 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); |
| 683 | |
| 684 | if (src_info->ipi6_ifindex) { |
| 685 | if (fl6->flowi6_oif && |
| 686 | src_info->ipi6_ifindex != fl6->flowi6_oif) |
| 687 | return -EINVAL; |
| 688 | fl6->flowi6_oif = src_info->ipi6_ifindex; |
| 689 | } |
| 690 | |
| 691 | addr_type = __ipv6_addr_type(&src_info->ipi6_addr); |
| 692 | |
| 693 | rcu_read_lock(); |
| 694 | if (fl6->flowi6_oif) { |
| 695 | dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); |
| 696 | if (!dev) { |
| 697 | rcu_read_unlock(); |
| 698 | return -ENODEV; |
| 699 | } |
| 700 | } else if (addr_type & IPV6_ADDR_LINKLOCAL) { |
| 701 | rcu_read_unlock(); |
| 702 | return -EINVAL; |
| 703 | } |
| 704 | |
| 705 | if (addr_type != IPV6_ADDR_ANY) { |
| 706 | int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; |
| 707 | if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && |
| 708 | !ipv6_chk_addr(net, &src_info->ipi6_addr, |
| 709 | strict ? dev : NULL, 0) && |
| 710 | !ipv6_chk_acast_addr_src(net, dev, |
| 711 | &src_info->ipi6_addr)) |
| 712 | err = -EINVAL; |
| 713 | else |
| 714 | fl6->saddr = src_info->ipi6_addr; |
| 715 | } |
| 716 | |
| 717 | rcu_read_unlock(); |
| 718 | |
| 719 | if (err) |
| 720 | goto exit_f; |
| 721 | |
| 722 | break; |
| 723 | } |
| 724 | |
| 725 | case IPV6_FLOWINFO: |
| 726 | if (cmsg->cmsg_len < CMSG_LEN(4)) { |
| 727 | err = -EINVAL; |
| 728 | goto exit_f; |
| 729 | } |
| 730 | |
| 731 | if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { |
| 732 | if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { |
| 733 | err = -EINVAL; |
| 734 | goto exit_f; |
| 735 | } |
| 736 | } |
| 737 | fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); |
| 738 | break; |
| 739 | |
| 740 | case IPV6_2292HOPOPTS: |
| 741 | case IPV6_HOPOPTS: |
| 742 | if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
| 743 | err = -EINVAL; |
| 744 | goto exit_f; |
| 745 | } |
| 746 | |
| 747 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); |
| 748 | len = ((hdr->hdrlen + 1) << 3); |
| 749 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| 750 | err = -EINVAL; |
| 751 | goto exit_f; |
| 752 | } |
| 753 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
| 754 | err = -EPERM; |
| 755 | goto exit_f; |
| 756 | } |
| 757 | opt->opt_nflen += len; |
| 758 | opt->hopopt = hdr; |
| 759 | break; |
| 760 | |
| 761 | case IPV6_2292DSTOPTS: |
| 762 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
| 763 | err = -EINVAL; |
| 764 | goto exit_f; |
| 765 | } |
| 766 | |
| 767 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); |
| 768 | len = ((hdr->hdrlen + 1) << 3); |
| 769 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| 770 | err = -EINVAL; |
| 771 | goto exit_f; |
| 772 | } |
| 773 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
| 774 | err = -EPERM; |
| 775 | goto exit_f; |
| 776 | } |
| 777 | if (opt->dst1opt) { |
| 778 | err = -EINVAL; |
| 779 | goto exit_f; |
| 780 | } |
| 781 | opt->opt_flen += len; |
| 782 | opt->dst1opt = hdr; |
| 783 | break; |
| 784 | |
| 785 | case IPV6_DSTOPTS: |
| 786 | case IPV6_RTHDRDSTOPTS: |
| 787 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
| 788 | err = -EINVAL; |
| 789 | goto exit_f; |
| 790 | } |
| 791 | |
| 792 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); |
| 793 | len = ((hdr->hdrlen + 1) << 3); |
| 794 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| 795 | err = -EINVAL; |
| 796 | goto exit_f; |
| 797 | } |
| 798 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
| 799 | err = -EPERM; |
| 800 | goto exit_f; |
| 801 | } |
| 802 | if (cmsg->cmsg_type == IPV6_DSTOPTS) { |
| 803 | opt->opt_flen += len; |
| 804 | opt->dst1opt = hdr; |
| 805 | } else { |
| 806 | opt->opt_nflen += len; |
| 807 | opt->dst0opt = hdr; |
| 808 | } |
| 809 | break; |
| 810 | |
| 811 | case IPV6_2292RTHDR: |
| 812 | case IPV6_RTHDR: |
| 813 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { |
| 814 | err = -EINVAL; |
| 815 | goto exit_f; |
| 816 | } |
| 817 | |
| 818 | rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); |
| 819 | |
| 820 | switch (rthdr->type) { |
| 821 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
| 822 | case IPV6_SRCRT_TYPE_2: |
| 823 | if (rthdr->hdrlen != 2 || |
| 824 | rthdr->segments_left != 1) { |
| 825 | err = -EINVAL; |
| 826 | goto exit_f; |
| 827 | } |
| 828 | break; |
| 829 | #endif |
| 830 | default: |
| 831 | err = -EINVAL; |
| 832 | goto exit_f; |
| 833 | } |
| 834 | |
| 835 | len = ((rthdr->hdrlen + 1) << 3); |
| 836 | |
| 837 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| 838 | err = -EINVAL; |
| 839 | goto exit_f; |
| 840 | } |
| 841 | |
| 842 | /* segments left must also match */ |
| 843 | if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { |
| 844 | err = -EINVAL; |
| 845 | goto exit_f; |
| 846 | } |
| 847 | |
| 848 | opt->opt_nflen += len; |
| 849 | opt->srcrt = rthdr; |
| 850 | |
| 851 | if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { |
| 852 | int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); |
| 853 | |
| 854 | opt->opt_nflen += dsthdrlen; |
| 855 | opt->dst0opt = opt->dst1opt; |
| 856 | opt->dst1opt = NULL; |
| 857 | opt->opt_flen -= dsthdrlen; |
| 858 | } |
| 859 | |
| 860 | break; |
| 861 | |
| 862 | case IPV6_2292HOPLIMIT: |
| 863 | case IPV6_HOPLIMIT: |
| 864 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { |
| 865 | err = -EINVAL; |
| 866 | goto exit_f; |
| 867 | } |
| 868 | |
| 869 | *hlimit = *(int *)CMSG_DATA(cmsg); |
| 870 | if (*hlimit < -1 || *hlimit > 0xff) { |
| 871 | err = -EINVAL; |
| 872 | goto exit_f; |
| 873 | } |
| 874 | |
| 875 | break; |
| 876 | |
| 877 | case IPV6_TCLASS: |
| 878 | { |
| 879 | int tc; |
| 880 | |
| 881 | err = -EINVAL; |
| 882 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
| 883 | goto exit_f; |
| 884 | |
| 885 | tc = *(int *)CMSG_DATA(cmsg); |
| 886 | if (tc < -1 || tc > 0xff) |
| 887 | goto exit_f; |
| 888 | |
| 889 | err = 0; |
| 890 | *tclass = tc; |
| 891 | |
| 892 | break; |
| 893 | } |
| 894 | |
| 895 | case IPV6_DONTFRAG: |
| 896 | { |
| 897 | int df; |
| 898 | |
| 899 | err = -EINVAL; |
| 900 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
| 901 | goto exit_f; |
| 902 | |
| 903 | df = *(int *)CMSG_DATA(cmsg); |
| 904 | if (df < 0 || df > 1) |
| 905 | goto exit_f; |
| 906 | |
| 907 | err = 0; |
| 908 | *dontfrag = df; |
| 909 | |
| 910 | break; |
| 911 | } |
| 912 | default: |
| 913 | net_dbg_ratelimited("invalid cmsg type: %d\n", |
| 914 | cmsg->cmsg_type); |
| 915 | err = -EINVAL; |
| 916 | goto exit_f; |
| 917 | } |
| 918 | } |
| 919 | |
| 920 | exit_f: |
| 921 | return err; |
| 922 | } |
| 923 | EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); |
| 924 | |
| 925 | void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, |
| 926 | __u16 srcp, __u16 destp, int bucket) |
| 927 | { |
| 928 | const struct in6_addr *dest, *src; |
| 929 | |
| 930 | dest = &sp->sk_v6_daddr; |
| 931 | src = &sp->sk_v6_rcv_saddr; |
| 932 | seq_printf(seq, |
| 933 | "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| 934 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", |
| 935 | bucket, |
| 936 | src->s6_addr32[0], src->s6_addr32[1], |
| 937 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
| 938 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 939 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
| 940 | sp->sk_state, |
| 941 | sk_wmem_alloc_get(sp), |
| 942 | sk_rmem_alloc_get(sp), |
| 943 | 0, 0L, 0, |
| 944 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
| 945 | 0, |
| 946 | sock_i_ino(sp), |
| 947 | atomic_read(&sp->sk_refcnt), sp, |
| 948 | atomic_read(&sp->sk_drops)); |
| 949 | } |