1// SPDX-License-Identifier: GPL-2.0 2/* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * The IP to API glue. 8 * 9 * Authors: see ip.c 10 * 11 * Fixes: 12 * Many : Split from ip.c , see ip.c for history. 13 * Martin Mares : TOS setting fixed. 14 * Alan Cox : Fixed a couple of oopses in Martin's 15 * TOS tweaks. 16 * Mike McLagan : Routing by source 17 */ 18 19#include <linux/module.h> 20#include <linux/types.h> 21#include <linux/mm.h> 22#include <linux/skbuff.h> 23#include <linux/ip.h> 24#include <linux/icmp.h> 25#include <linux/inetdevice.h> 26#include <linux/netdevice.h> 27#include <linux/slab.h> 28#include <net/sock.h> 29#include <net/ip.h> 30#include <net/icmp.h> 31#include <net/tcp_states.h> 32#include <linux/udp.h> 33#include <linux/igmp.h> 34#include <linux/netfilter.h> 35#include <linux/route.h> 36#include <linux/mroute.h> 37#include <net/inet_ecn.h> 38#include <net/route.h> 39#include <net/xfrm.h> 40#include <net/compat.h> 41#include <net/checksum.h> 42#if IS_ENABLED(CONFIG_IPV6) 43#include <net/transp_v6.h> 44#endif 45#include <net/ip_fib.h> 46 47#include <linux/errqueue.h> 48#include <linux/uaccess.h> 49 50#include <linux/bpfilter.h> 51 52/* 53 * SOL_IP control messages. 54 */ 55 56static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) 57{ 58 struct in_pktinfo info = *PKTINFO_SKB_CB(skb); 59 60 info.ipi_addr.s_addr = ip_hdr(skb)->daddr; 61 62 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 63} 64 65static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) 66{ 67 int ttl = ip_hdr(skb)->ttl; 68 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); 69} 70 71static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) 72{ 73 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); 74} 75 76static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) 77{ 78 if (IPCB(skb)->opt.optlen == 0) 79 return; 80 81 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, 82 ip_hdr(skb) + 1); 83} 84 85 86static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg, 87 struct sk_buff *skb) 88{ 89 unsigned char optbuf[sizeof(struct ip_options) + 40]; 90 struct ip_options *opt = (struct ip_options *)optbuf; 91 92 if (IPCB(skb)->opt.optlen == 0) 93 return; 94 95 if (ip_options_echo(net, opt, skb)) { 96 msg->msg_flags |= MSG_CTRUNC; 97 return; 98 } 99 ip_options_undo(opt); 100 101 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); 102} 103 104static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb) 105{ 106 int val; 107 108 if (IPCB(skb)->frag_max_size == 0) 109 return; 110 111 val = IPCB(skb)->frag_max_size; 112 put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val); 113} 114 115static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, 116 int tlen, int offset) 117{ 118 __wsum csum = skb->csum; 119 120 if (skb->ip_summed != CHECKSUM_COMPLETE) 121 return; 122 123 if (offset != 0) { 124 int tend_off = skb_transport_offset(skb) + tlen; 125 csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0)); 126 } 127 128 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); 129} 130 131static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 132{ 133 char *secdata; 134 u32 seclen, secid; 135 int err; 136 137 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 138 if (err) 139 return; 140 141 err = security_secid_to_secctx(secid, &secdata, &seclen); 142 if (err) 143 return; 144 145 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 146 security_release_secctx(secdata, seclen); 147} 148 149static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) 150{ 151 __be16 _ports[2], *ports; 152 struct sockaddr_in sin; 153 154 /* All current transport protocols have the port numbers in the 155 * first four bytes of the transport header and this function is 156 * written with this assumption in mind. 157 */ 158 ports = skb_header_pointer(skb, skb_transport_offset(skb), 159 sizeof(_ports), &_ports); 160 if (!ports) 161 return; 162 163 sin.sin_family = AF_INET; 164 sin.sin_addr.s_addr = ip_hdr(skb)->daddr; 165 sin.sin_port = ports[1]; 166 memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); 167 168 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); 169} 170 171void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, 172 struct sk_buff *skb, int tlen, int offset) 173{ 174 struct inet_sock *inet = inet_sk(sk); 175 unsigned int flags = inet->cmsg_flags; 176 177 /* Ordered by supposed usage frequency */ 178 if (flags & IP_CMSG_PKTINFO) { 179 ip_cmsg_recv_pktinfo(msg, skb); 180 181 flags &= ~IP_CMSG_PKTINFO; 182 if (!flags) 183 return; 184 } 185 186 if (flags & IP_CMSG_TTL) { 187 ip_cmsg_recv_ttl(msg, skb); 188 189 flags &= ~IP_CMSG_TTL; 190 if (!flags) 191 return; 192 } 193 194 if (flags & IP_CMSG_TOS) { 195 ip_cmsg_recv_tos(msg, skb); 196 197 flags &= ~IP_CMSG_TOS; 198 if (!flags) 199 return; 200 } 201 202 if (flags & IP_CMSG_RECVOPTS) { 203 ip_cmsg_recv_opts(msg, skb); 204 205 flags &= ~IP_CMSG_RECVOPTS; 206 if (!flags) 207 return; 208 } 209 210 if (flags & IP_CMSG_RETOPTS) { 211 ip_cmsg_recv_retopts(sock_net(sk), msg, skb); 212 213 flags &= ~IP_CMSG_RETOPTS; 214 if (!flags) 215 return; 216 } 217 218 if (flags & IP_CMSG_PASSSEC) { 219 ip_cmsg_recv_security(msg, skb); 220 221 flags &= ~IP_CMSG_PASSSEC; 222 if (!flags) 223 return; 224 } 225 226 if (flags & IP_CMSG_ORIGDSTADDR) { 227 ip_cmsg_recv_dstaddr(msg, skb); 228 229 flags &= ~IP_CMSG_ORIGDSTADDR; 230 if (!flags) 231 return; 232 } 233 234 if (flags & IP_CMSG_CHECKSUM) 235 ip_cmsg_recv_checksum(msg, skb, tlen, offset); 236 237 if (flags & IP_CMSG_RECVFRAGSIZE) 238 ip_cmsg_recv_fragsize(msg, skb); 239} 240EXPORT_SYMBOL(ip_cmsg_recv_offset); 241 242int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, 243 bool allow_ipv6) 244{ 245 int err, val; 246 struct cmsghdr *cmsg; 247 struct net *net = sock_net(sk); 248 249 for_each_cmsghdr(cmsg, msg) { 250 if (!CMSG_OK(msg, cmsg)) 251 return -EINVAL; 252#if IS_ENABLED(CONFIG_IPV6) 253 if (allow_ipv6 && 254 cmsg->cmsg_level == SOL_IPV6 && 255 cmsg->cmsg_type == IPV6_PKTINFO) { 256 struct in6_pktinfo *src_info; 257 258 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) 259 return -EINVAL; 260 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 261 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) 262 return -EINVAL; 263 if (src_info->ipi6_ifindex) 264 ipc->oif = src_info->ipi6_ifindex; 265 ipc->addr = src_info->ipi6_addr.s6_addr32[3]; 266 continue; 267 } 268#endif 269 if (cmsg->cmsg_level == SOL_SOCKET) { 270 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); 271 if (err) 272 return err; 273 continue; 274 } 275 276 if (cmsg->cmsg_level != SOL_IP) 277 continue; 278 switch (cmsg->cmsg_type) { 279 case IP_RETOPTS: 280 err = cmsg->cmsg_len - sizeof(struct cmsghdr); 281 282 /* Our caller is responsible for freeing ipc->opt */ 283 err = ip_options_get(net, &ipc->opt, 284 KERNEL_SOCKPTR(CMSG_DATA(cmsg)), 285 err < 40 ? err : 40); 286 if (err) 287 return err; 288 break; 289 case IP_PKTINFO: 290 { 291 struct in_pktinfo *info; 292 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 293 return -EINVAL; 294 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 295 if (info->ipi_ifindex) 296 ipc->oif = info->ipi_ifindex; 297 ipc->addr = info->ipi_spec_dst.s_addr; 298 break; 299 } 300 case IP_TTL: 301 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 302 return -EINVAL; 303 val = *(int *)CMSG_DATA(cmsg); 304 if (val < 1 || val > 255) 305 return -EINVAL; 306 ipc->ttl = val; 307 break; 308 case IP_TOS: 309 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) 310 val = *(int *)CMSG_DATA(cmsg); 311 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8))) 312 val = *(u8 *)CMSG_DATA(cmsg); 313 else 314 return -EINVAL; 315 if (val < 0 || val > 255) 316 return -EINVAL; 317 ipc->tos = val; 318 ipc->priority = rt_tos2priority(ipc->tos); 319 break; 320 case IP_PROTOCOL: 321 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 322 return -EINVAL; 323 val = *(int *)CMSG_DATA(cmsg); 324 if (val < 1 || val > 255) 325 return -EINVAL; 326 ipc->protocol = val; 327 break; 328 default: 329 return -EINVAL; 330 } 331 } 332 return 0; 333} 334 335static void ip_ra_destroy_rcu(struct rcu_head *head) 336{ 337 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 338 339 sock_put(ra->saved_sk); 340 kfree(ra); 341} 342 343int ip_ra_control(struct sock *sk, unsigned char on, 344 void (*destructor)(struct sock *)) 345{ 346 struct ip_ra_chain *ra, *new_ra; 347 struct ip_ra_chain __rcu **rap; 348 struct net *net = sock_net(sk); 349 350 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 351 return -EINVAL; 352 353 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 354 if (on && !new_ra) 355 return -ENOMEM; 356 357 mutex_lock(&net->ipv4.ra_mutex); 358 for (rap = &net->ipv4.ra_chain; 359 (ra = rcu_dereference_protected(*rap, 360 lockdep_is_held(&net->ipv4.ra_mutex))) != NULL; 361 rap = &ra->next) { 362 if (ra->sk == sk) { 363 if (on) { 364 mutex_unlock(&net->ipv4.ra_mutex); 365 kfree(new_ra); 366 return -EADDRINUSE; 367 } 368 /* dont let ip_call_ra_chain() use sk again */ 369 ra->sk = NULL; 370 RCU_INIT_POINTER(*rap, ra->next); 371 mutex_unlock(&net->ipv4.ra_mutex); 372 373 if (ra->destructor) 374 ra->destructor(sk); 375 /* 376 * Delay sock_put(sk) and kfree(ra) after one rcu grace 377 * period. This guarantee ip_call_ra_chain() dont need 378 * to mess with socket refcounts. 379 */ 380 ra->saved_sk = sk; 381 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 382 return 0; 383 } 384 } 385 if (!new_ra) { 386 mutex_unlock(&net->ipv4.ra_mutex); 387 return -ENOBUFS; 388 } 389 new_ra->sk = sk; 390 new_ra->destructor = destructor; 391 392 RCU_INIT_POINTER(new_ra->next, ra); 393 rcu_assign_pointer(*rap, new_ra); 394 sock_hold(sk); 395 mutex_unlock(&net->ipv4.ra_mutex); 396 397 return 0; 398} 399 400static void ipv4_icmp_error_rfc4884(const struct sk_buff *skb, 401 struct sock_ee_data_rfc4884 *out) 402{ 403 switch (icmp_hdr(skb)->type) { 404 case ICMP_DEST_UNREACH: 405 case ICMP_TIME_EXCEEDED: 406 case ICMP_PARAMETERPROB: 407 ip_icmp_error_rfc4884(skb, out, sizeof(struct icmphdr), 408 icmp_hdr(skb)->un.reserved[1] * 4); 409 } 410} 411 412void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 413 __be16 port, u32 info, u8 *payload) 414{ 415 struct sock_exterr_skb *serr; 416 417 skb = skb_clone(skb, GFP_ATOMIC); 418 if (!skb) 419 return; 420 421 serr = SKB_EXT_ERR(skb); 422 serr->ee.ee_errno = err; 423 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 424 serr->ee.ee_type = icmp_hdr(skb)->type; 425 serr->ee.ee_code = icmp_hdr(skb)->code; 426 serr->ee.ee_pad = 0; 427 serr->ee.ee_info = info; 428 serr->ee.ee_data = 0; 429 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 430 skb_network_header(skb); 431 serr->port = port; 432 433 if (skb_pull(skb, payload - skb->data)) { 434 if (inet_sk(sk)->recverr_rfc4884) 435 ipv4_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884); 436 437 skb_reset_transport_header(skb); 438 if (sock_queue_err_skb(sk, skb) == 0) 439 return; 440 } 441 kfree_skb(skb); 442} 443 444void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 445{ 446 struct inet_sock *inet = inet_sk(sk); 447 struct sock_exterr_skb *serr; 448 struct iphdr *iph; 449 struct sk_buff *skb; 450 451 if (!inet->recverr) 452 return; 453 454 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 455 if (!skb) 456 return; 457 458 skb_put(skb, sizeof(struct iphdr)); 459 skb_reset_network_header(skb); 460 iph = ip_hdr(skb); 461 iph->daddr = daddr; 462 463 serr = SKB_EXT_ERR(skb); 464 serr->ee.ee_errno = err; 465 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 466 serr->ee.ee_type = 0; 467 serr->ee.ee_code = 0; 468 serr->ee.ee_pad = 0; 469 serr->ee.ee_info = info; 470 serr->ee.ee_data = 0; 471 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 472 serr->port = port; 473 474 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 475 skb_reset_transport_header(skb); 476 477 if (sock_queue_err_skb(sk, skb)) 478 kfree_skb(skb); 479} 480 481/* For some errors we have valid addr_offset even with zero payload and 482 * zero port. Also, addr_offset should be supported if port is set. 483 */ 484static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) 485{ 486 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 487 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 488} 489 490/* IPv4 supports cmsg on all imcp errors and some timestamps 491 * 492 * Timestamp code paths do not initialize the fields expected by cmsg: 493 * the PKTINFO fields in skb->cb[]. Fill those in here. 494 */ 495static bool ipv4_datagram_support_cmsg(const struct sock *sk, 496 struct sk_buff *skb, 497 int ee_origin) 498{ 499 struct in_pktinfo *info; 500 501 if (ee_origin == SO_EE_ORIGIN_ICMP) 502 return true; 503 504 if (ee_origin == SO_EE_ORIGIN_LOCAL) 505 return false; 506 507 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 508 * timestamp with egress dev. Not possible for packets without iif 509 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 510 */ 511 info = PKTINFO_SKB_CB(skb); 512 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || 513 !info->ipi_ifindex) 514 return false; 515 516 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 517 return true; 518} 519 520/* 521 * Handle MSG_ERRQUEUE 522 */ 523int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 524{ 525 struct sock_exterr_skb *serr; 526 struct sk_buff *skb; 527 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 528 struct { 529 struct sock_extended_err ee; 530 struct sockaddr_in offender; 531 } errhdr; 532 int err; 533 int copied; 534 535 err = -EAGAIN; 536 skb = sock_dequeue_err_skb(sk); 537 if (!skb) 538 goto out; 539 540 copied = skb->len; 541 if (copied > len) { 542 msg->msg_flags |= MSG_TRUNC; 543 copied = len; 544 } 545 err = skb_copy_datagram_msg(skb, 0, msg, copied); 546 if (unlikely(err)) { 547 kfree_skb(skb); 548 return err; 549 } 550 sock_recv_timestamp(msg, sk, skb); 551 552 serr = SKB_EXT_ERR(skb); 553 554 if (sin && ipv4_datagram_support_addr(serr)) { 555 sin->sin_family = AF_INET; 556 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 557 serr->addr_offset); 558 sin->sin_port = serr->port; 559 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 560 *addr_len = sizeof(*sin); 561 } 562 563 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 564 sin = &errhdr.offender; 565 memset(sin, 0, sizeof(*sin)); 566 567 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { 568 sin->sin_family = AF_INET; 569 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 570 if (inet_sk(sk)->cmsg_flags) 571 ip_cmsg_recv(msg, skb); 572 } 573 574 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 575 576 /* Now we could try to dump offended packet options */ 577 578 msg->msg_flags |= MSG_ERRQUEUE; 579 err = copied; 580 581 consume_skb(skb); 582out: 583 return err; 584} 585 586static void __ip_sock_set_tos(struct sock *sk, int val) 587{ 588 if (sk->sk_type == SOCK_STREAM) { 589 val &= ~INET_ECN_MASK; 590 val |= inet_sk(sk)->tos & INET_ECN_MASK; 591 } 592 if (inet_sk(sk)->tos != val) { 593 inet_sk(sk)->tos = val; 594 sk->sk_priority = rt_tos2priority(val); 595 sk_dst_reset(sk); 596 } 597} 598 599void ip_sock_set_tos(struct sock *sk, int val) 600{ 601 lock_sock(sk); 602 __ip_sock_set_tos(sk, val); 603 release_sock(sk); 604} 605EXPORT_SYMBOL(ip_sock_set_tos); 606 607void ip_sock_set_freebind(struct sock *sk) 608{ 609 lock_sock(sk); 610 inet_sk(sk)->freebind = true; 611 release_sock(sk); 612} 613EXPORT_SYMBOL(ip_sock_set_freebind); 614 615void ip_sock_set_recverr(struct sock *sk) 616{ 617 lock_sock(sk); 618 inet_sk(sk)->recverr = true; 619 release_sock(sk); 620} 621EXPORT_SYMBOL(ip_sock_set_recverr); 622 623int ip_sock_set_mtu_discover(struct sock *sk, int val) 624{ 625 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 626 return -EINVAL; 627 lock_sock(sk); 628 inet_sk(sk)->pmtudisc = val; 629 release_sock(sk); 630 return 0; 631} 632EXPORT_SYMBOL(ip_sock_set_mtu_discover); 633 634void ip_sock_set_pktinfo(struct sock *sk) 635{ 636 lock_sock(sk); 637 inet_sk(sk)->cmsg_flags |= IP_CMSG_PKTINFO; 638 release_sock(sk); 639} 640EXPORT_SYMBOL(ip_sock_set_pktinfo); 641 642/* 643 * Socket option code for IP. This is the end of the line after any 644 * TCP,UDP etc options on an IP socket. 645 */ 646static bool setsockopt_needs_rtnl(int optname) 647{ 648 switch (optname) { 649 case IP_ADD_MEMBERSHIP: 650 case IP_ADD_SOURCE_MEMBERSHIP: 651 case IP_BLOCK_SOURCE: 652 case IP_DROP_MEMBERSHIP: 653 case IP_DROP_SOURCE_MEMBERSHIP: 654 case IP_MSFILTER: 655 case IP_UNBLOCK_SOURCE: 656 case MCAST_BLOCK_SOURCE: 657 case MCAST_MSFILTER: 658 case MCAST_JOIN_GROUP: 659 case MCAST_JOIN_SOURCE_GROUP: 660 case MCAST_LEAVE_GROUP: 661 case MCAST_LEAVE_SOURCE_GROUP: 662 case MCAST_UNBLOCK_SOURCE: 663 return true; 664 } 665 return false; 666} 667 668static int set_mcast_msfilter(struct sock *sk, int ifindex, 669 int numsrc, int fmode, 670 struct sockaddr_storage *group, 671 struct sockaddr_storage *list) 672{ 673 int msize = IP_MSFILTER_SIZE(numsrc); 674 struct ip_msfilter *msf; 675 struct sockaddr_in *psin; 676 int err, i; 677 678 msf = kmalloc(msize, GFP_KERNEL); 679 if (!msf) 680 return -ENOBUFS; 681 682 psin = (struct sockaddr_in *)group; 683 if (psin->sin_family != AF_INET) 684 goto Eaddrnotavail; 685 msf->imsf_multiaddr = psin->sin_addr.s_addr; 686 msf->imsf_interface = 0; 687 msf->imsf_fmode = fmode; 688 msf->imsf_numsrc = numsrc; 689 for (i = 0; i < numsrc; ++i) { 690 psin = (struct sockaddr_in *)&list[i]; 691 692 if (psin->sin_family != AF_INET) 693 goto Eaddrnotavail; 694 msf->imsf_slist[i] = psin->sin_addr.s_addr; 695 } 696 err = ip_mc_msfilter(sk, msf, ifindex); 697 kfree(msf); 698 return err; 699 700Eaddrnotavail: 701 kfree(msf); 702 return -EADDRNOTAVAIL; 703} 704 705static int copy_group_source_from_sockptr(struct group_source_req *greqs, 706 sockptr_t optval, int optlen) 707{ 708 if (in_compat_syscall()) { 709 struct compat_group_source_req gr32; 710 711 if (optlen != sizeof(gr32)) 712 return -EINVAL; 713 if (copy_from_sockptr(&gr32, optval, sizeof(gr32))) 714 return -EFAULT; 715 greqs->gsr_interface = gr32.gsr_interface; 716 greqs->gsr_group = gr32.gsr_group; 717 greqs->gsr_source = gr32.gsr_source; 718 } else { 719 if (optlen != sizeof(*greqs)) 720 return -EINVAL; 721 if (copy_from_sockptr(greqs, optval, sizeof(*greqs))) 722 return -EFAULT; 723 } 724 725 return 0; 726} 727 728static int do_mcast_group_source(struct sock *sk, int optname, 729 sockptr_t optval, int optlen) 730{ 731 struct group_source_req greqs; 732 struct ip_mreq_source mreqs; 733 struct sockaddr_in *psin; 734 int omode, add, err; 735 736 err = copy_group_source_from_sockptr(&greqs, optval, optlen); 737 if (err) 738 return err; 739 740 if (greqs.gsr_group.ss_family != AF_INET || 741 greqs.gsr_source.ss_family != AF_INET) 742 return -EADDRNOTAVAIL; 743 744 psin = (struct sockaddr_in *)&greqs.gsr_group; 745 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 746 psin = (struct sockaddr_in *)&greqs.gsr_source; 747 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 748 mreqs.imr_interface = 0; /* use index for mc_source */ 749 750 if (optname == MCAST_BLOCK_SOURCE) { 751 omode = MCAST_EXCLUDE; 752 add = 1; 753 } else if (optname == MCAST_UNBLOCK_SOURCE) { 754 omode = MCAST_EXCLUDE; 755 add = 0; 756 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 757 struct ip_mreqn mreq; 758 759 psin = (struct sockaddr_in *)&greqs.gsr_group; 760 mreq.imr_multiaddr = psin->sin_addr; 761 mreq.imr_address.s_addr = 0; 762 mreq.imr_ifindex = greqs.gsr_interface; 763 err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); 764 if (err && err != -EADDRINUSE) 765 return err; 766 greqs.gsr_interface = mreq.imr_ifindex; 767 omode = MCAST_INCLUDE; 768 add = 1; 769 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 770 omode = MCAST_INCLUDE; 771 add = 0; 772 } 773 return ip_mc_source(add, omode, sk, &mreqs, greqs.gsr_interface); 774} 775 776static int ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval, int optlen) 777{ 778 struct group_filter *gsf = NULL; 779 int err; 780 781 if (optlen < GROUP_FILTER_SIZE(0)) 782 return -EINVAL; 783 if (optlen > READ_ONCE(sysctl_optmem_max)) 784 return -ENOBUFS; 785 786 gsf = memdup_sockptr(optval, optlen); 787 if (IS_ERR(gsf)) 788 return PTR_ERR(gsf); 789 790 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 791 err = -ENOBUFS; 792 if (gsf->gf_numsrc >= 0x1ffffff || 793 gsf->gf_numsrc > READ_ONCE(sock_net(sk)->ipv4.sysctl_igmp_max_msf)) 794 goto out_free_gsf; 795 796 err = -EINVAL; 797 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) 798 goto out_free_gsf; 799 800 err = set_mcast_msfilter(sk, gsf->gf_interface, gsf->gf_numsrc, 801 gsf->gf_fmode, &gsf->gf_group, gsf->gf_slist); 802out_free_gsf: 803 kfree(gsf); 804 return err; 805} 806 807static int compat_ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval, 808 int optlen) 809{ 810 const int size0 = offsetof(struct compat_group_filter, gf_slist); 811 struct compat_group_filter *gf32; 812 unsigned int n; 813 void *p; 814 int err; 815 816 if (optlen < size0) 817 return -EINVAL; 818 if (optlen > READ_ONCE(sysctl_optmem_max) - 4) 819 return -ENOBUFS; 820 821 p = kmalloc(optlen + 4, GFP_KERNEL); 822 if (!p) 823 return -ENOMEM; 824 gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */ 825 826 err = -EFAULT; 827 if (copy_from_sockptr(gf32, optval, optlen)) 828 goto out_free_gsf; 829 830 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 831 n = gf32->gf_numsrc; 832 err = -ENOBUFS; 833 if (n >= 0x1ffffff) 834 goto out_free_gsf; 835 836 err = -EINVAL; 837 if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen) 838 goto out_free_gsf; 839 840 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 841 err = -ENOBUFS; 842 if (n > READ_ONCE(sock_net(sk)->ipv4.sysctl_igmp_max_msf)) 843 goto out_free_gsf; 844 err = set_mcast_msfilter(sk, gf32->gf_interface, n, gf32->gf_fmode, 845 &gf32->gf_group, gf32->gf_slist); 846out_free_gsf: 847 kfree(p); 848 return err; 849} 850 851static int ip_mcast_join_leave(struct sock *sk, int optname, 852 sockptr_t optval, int optlen) 853{ 854 struct ip_mreqn mreq = { }; 855 struct sockaddr_in *psin; 856 struct group_req greq; 857 858 if (optlen < sizeof(struct group_req)) 859 return -EINVAL; 860 if (copy_from_sockptr(&greq, optval, sizeof(greq))) 861 return -EFAULT; 862 863 psin = (struct sockaddr_in *)&greq.gr_group; 864 if (psin->sin_family != AF_INET) 865 return -EINVAL; 866 mreq.imr_multiaddr = psin->sin_addr; 867 mreq.imr_ifindex = greq.gr_interface; 868 if (optname == MCAST_JOIN_GROUP) 869 return ip_mc_join_group(sk, &mreq); 870 return ip_mc_leave_group(sk, &mreq); 871} 872 873static int compat_ip_mcast_join_leave(struct sock *sk, int optname, 874 sockptr_t optval, int optlen) 875{ 876 struct compat_group_req greq; 877 struct ip_mreqn mreq = { }; 878 struct sockaddr_in *psin; 879 880 if (optlen < sizeof(struct compat_group_req)) 881 return -EINVAL; 882 if (copy_from_sockptr(&greq, optval, sizeof(greq))) 883 return -EFAULT; 884 885 psin = (struct sockaddr_in *)&greq.gr_group; 886 if (psin->sin_family != AF_INET) 887 return -EINVAL; 888 mreq.imr_multiaddr = psin->sin_addr; 889 mreq.imr_ifindex = greq.gr_interface; 890 891 if (optname == MCAST_JOIN_GROUP) 892 return ip_mc_join_group(sk, &mreq); 893 return ip_mc_leave_group(sk, &mreq); 894} 895 896static int do_ip_setsockopt(struct sock *sk, int level, int optname, 897 sockptr_t optval, unsigned int optlen) 898{ 899 struct inet_sock *inet = inet_sk(sk); 900 struct net *net = sock_net(sk); 901 int val = 0, err; 902 bool needs_rtnl = setsockopt_needs_rtnl(optname); 903 904 switch (optname) { 905 case IP_PKTINFO: 906 case IP_RECVTTL: 907 case IP_RECVOPTS: 908 case IP_RECVTOS: 909 case IP_RETOPTS: 910 case IP_TOS: 911 case IP_TTL: 912 case IP_HDRINCL: 913 case IP_MTU_DISCOVER: 914 case IP_RECVERR: 915 case IP_ROUTER_ALERT: 916 case IP_FREEBIND: 917 case IP_PASSSEC: 918 case IP_TRANSPARENT: 919 case IP_MINTTL: 920 case IP_NODEFRAG: 921 case IP_BIND_ADDRESS_NO_PORT: 922 case IP_UNICAST_IF: 923 case IP_MULTICAST_TTL: 924 case IP_MULTICAST_ALL: 925 case IP_MULTICAST_LOOP: 926 case IP_RECVORIGDSTADDR: 927 case IP_CHECKSUM: 928 case IP_RECVFRAGSIZE: 929 case IP_RECVERR_RFC4884: 930 if (optlen >= sizeof(int)) { 931 if (copy_from_sockptr(&val, optval, sizeof(val))) 932 return -EFAULT; 933 } else if (optlen >= sizeof(char)) { 934 unsigned char ucval; 935 936 if (copy_from_sockptr(&ucval, optval, sizeof(ucval))) 937 return -EFAULT; 938 val = (int) ucval; 939 } 940 } 941 942 /* If optlen==0, it is equivalent to val == 0 */ 943 944 if (optname == IP_ROUTER_ALERT) 945 return ip_ra_control(sk, val ? 1 : 0, NULL); 946 if (ip_mroute_opt(optname)) 947 return ip_mroute_setsockopt(sk, optname, optval, optlen); 948 949 err = 0; 950 if (needs_rtnl) 951 rtnl_lock(); 952 lock_sock(sk); 953 954 switch (optname) { 955 case IP_OPTIONS: 956 { 957 struct ip_options_rcu *old, *opt = NULL; 958 959 if (optlen > 40) 960 goto e_inval; 961 err = ip_options_get(sock_net(sk), &opt, optval, optlen); 962 if (err) 963 break; 964 old = rcu_dereference_protected(inet->inet_opt, 965 lockdep_sock_is_held(sk)); 966 if (inet->is_icsk) { 967 struct inet_connection_sock *icsk = inet_csk(sk); 968#if IS_ENABLED(CONFIG_IPV6) 969 if (sk->sk_family == PF_INET || 970 (!((1 << sk->sk_state) & 971 (TCPF_LISTEN | TCPF_CLOSE)) && 972 inet->inet_daddr != LOOPBACK4_IPV6)) { 973#endif 974 if (old) 975 icsk->icsk_ext_hdr_len -= old->opt.optlen; 976 if (opt) 977 icsk->icsk_ext_hdr_len += opt->opt.optlen; 978 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 979#if IS_ENABLED(CONFIG_IPV6) 980 } 981#endif 982 } 983 rcu_assign_pointer(inet->inet_opt, opt); 984 if (old) 985 kfree_rcu(old, rcu); 986 break; 987 } 988 case IP_PKTINFO: 989 if (val) 990 inet->cmsg_flags |= IP_CMSG_PKTINFO; 991 else 992 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 993 break; 994 case IP_RECVTTL: 995 if (val) 996 inet->cmsg_flags |= IP_CMSG_TTL; 997 else 998 inet->cmsg_flags &= ~IP_CMSG_TTL; 999 break; 1000 case IP_RECVTOS: 1001 if (val) 1002 inet->cmsg_flags |= IP_CMSG_TOS; 1003 else 1004 inet->cmsg_flags &= ~IP_CMSG_TOS; 1005 break; 1006 case IP_RECVOPTS: 1007 if (val) 1008 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 1009 else 1010 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 1011 break; 1012 case IP_RETOPTS: 1013 if (val) 1014 inet->cmsg_flags |= IP_CMSG_RETOPTS; 1015 else 1016 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 1017 break; 1018 case IP_PASSSEC: 1019 if (val) 1020 inet->cmsg_flags |= IP_CMSG_PASSSEC; 1021 else 1022 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 1023 break; 1024 case IP_RECVORIGDSTADDR: 1025 if (val) 1026 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 1027 else 1028 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 1029 break; 1030 case IP_CHECKSUM: 1031 if (val) { 1032 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 1033 inet_inc_convert_csum(sk); 1034 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 1035 } 1036 } else { 1037 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 1038 inet_dec_convert_csum(sk); 1039 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 1040 } 1041 } 1042 break; 1043 case IP_RECVFRAGSIZE: 1044 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) 1045 goto e_inval; 1046 if (val) 1047 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; 1048 else 1049 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; 1050 break; 1051 case IP_TOS: /* This sets both TOS and Precedence */ 1052 __ip_sock_set_tos(sk, val); 1053 break; 1054 case IP_TTL: 1055 if (optlen < 1) 1056 goto e_inval; 1057 if (val != -1 && (val < 1 || val > 255)) 1058 goto e_inval; 1059 inet->uc_ttl = val; 1060 break; 1061 case IP_HDRINCL: 1062 if (sk->sk_type != SOCK_RAW) { 1063 err = -ENOPROTOOPT; 1064 break; 1065 } 1066 inet->hdrincl = val ? 1 : 0; 1067 break; 1068 case IP_NODEFRAG: 1069 if (sk->sk_type != SOCK_RAW) { 1070 err = -ENOPROTOOPT; 1071 break; 1072 } 1073 inet->nodefrag = val ? 1 : 0; 1074 break; 1075 case IP_BIND_ADDRESS_NO_PORT: 1076 inet->bind_address_no_port = val ? 1 : 0; 1077 break; 1078 case IP_MTU_DISCOVER: 1079 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 1080 goto e_inval; 1081 inet->pmtudisc = val; 1082 break; 1083 case IP_RECVERR: 1084 inet->recverr = !!val; 1085 if (!val) 1086 skb_queue_purge(&sk->sk_error_queue); 1087 break; 1088 case IP_RECVERR_RFC4884: 1089 if (val < 0 || val > 1) 1090 goto e_inval; 1091 inet->recverr_rfc4884 = !!val; 1092 break; 1093 case IP_MULTICAST_TTL: 1094 if (sk->sk_type == SOCK_STREAM) 1095 goto e_inval; 1096 if (optlen < 1) 1097 goto e_inval; 1098 if (val == -1) 1099 val = 1; 1100 if (val < 0 || val > 255) 1101 goto e_inval; 1102 inet->mc_ttl = val; 1103 break; 1104 case IP_MULTICAST_LOOP: 1105 if (optlen < 1) 1106 goto e_inval; 1107 inet->mc_loop = !!val; 1108 break; 1109 case IP_UNICAST_IF: 1110 { 1111 struct net_device *dev = NULL; 1112 int ifindex; 1113 int midx; 1114 1115 if (optlen != sizeof(int)) 1116 goto e_inval; 1117 1118 ifindex = (__force int)ntohl((__force __be32)val); 1119 if (ifindex == 0) { 1120 inet->uc_index = 0; 1121 err = 0; 1122 break; 1123 } 1124 1125 dev = dev_get_by_index(sock_net(sk), ifindex); 1126 err = -EADDRNOTAVAIL; 1127 if (!dev) 1128 break; 1129 1130 midx = l3mdev_master_ifindex(dev); 1131 dev_put(dev); 1132 1133 err = -EINVAL; 1134 if (sk->sk_bound_dev_if && midx != sk->sk_bound_dev_if) 1135 break; 1136 1137 inet->uc_index = ifindex; 1138 err = 0; 1139 break; 1140 } 1141 case IP_MULTICAST_IF: 1142 { 1143 struct ip_mreqn mreq; 1144 struct net_device *dev = NULL; 1145 int midx; 1146 1147 if (sk->sk_type == SOCK_STREAM) 1148 goto e_inval; 1149 /* 1150 * Check the arguments are allowable 1151 */ 1152 1153 if (optlen < sizeof(struct in_addr)) 1154 goto e_inval; 1155 1156 err = -EFAULT; 1157 if (optlen >= sizeof(struct ip_mreqn)) { 1158 if (copy_from_sockptr(&mreq, optval, sizeof(mreq))) 1159 break; 1160 } else { 1161 memset(&mreq, 0, sizeof(mreq)); 1162 if (optlen >= sizeof(struct ip_mreq)) { 1163 if (copy_from_sockptr(&mreq, optval, 1164 sizeof(struct ip_mreq))) 1165 break; 1166 } else if (optlen >= sizeof(struct in_addr)) { 1167 if (copy_from_sockptr(&mreq.imr_address, optval, 1168 sizeof(struct in_addr))) 1169 break; 1170 } 1171 } 1172 1173 if (!mreq.imr_ifindex) { 1174 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 1175 inet->mc_index = 0; 1176 inet->mc_addr = 0; 1177 err = 0; 1178 break; 1179 } 1180 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 1181 if (dev) 1182 mreq.imr_ifindex = dev->ifindex; 1183 } else 1184 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 1185 1186 1187 err = -EADDRNOTAVAIL; 1188 if (!dev) 1189 break; 1190 1191 midx = l3mdev_master_ifindex(dev); 1192 1193 dev_put(dev); 1194 1195 err = -EINVAL; 1196 if (sk->sk_bound_dev_if && 1197 mreq.imr_ifindex != sk->sk_bound_dev_if && 1198 midx != sk->sk_bound_dev_if) 1199 break; 1200 1201 inet->mc_index = mreq.imr_ifindex; 1202 inet->mc_addr = mreq.imr_address.s_addr; 1203 err = 0; 1204 break; 1205 } 1206 1207 case IP_ADD_MEMBERSHIP: 1208 case IP_DROP_MEMBERSHIP: 1209 { 1210 struct ip_mreqn mreq; 1211 1212 err = -EPROTO; 1213 if (inet_sk(sk)->is_icsk) 1214 break; 1215 1216 if (optlen < sizeof(struct ip_mreq)) 1217 goto e_inval; 1218 err = -EFAULT; 1219 if (optlen >= sizeof(struct ip_mreqn)) { 1220 if (copy_from_sockptr(&mreq, optval, sizeof(mreq))) 1221 break; 1222 } else { 1223 memset(&mreq, 0, sizeof(mreq)); 1224 if (copy_from_sockptr(&mreq, optval, 1225 sizeof(struct ip_mreq))) 1226 break; 1227 } 1228 1229 if (optname == IP_ADD_MEMBERSHIP) 1230 err = ip_mc_join_group(sk, &mreq); 1231 else 1232 err = ip_mc_leave_group(sk, &mreq); 1233 break; 1234 } 1235 case IP_MSFILTER: 1236 { 1237 struct ip_msfilter *msf; 1238 1239 if (optlen < IP_MSFILTER_SIZE(0)) 1240 goto e_inval; 1241 if (optlen > READ_ONCE(sysctl_optmem_max)) { 1242 err = -ENOBUFS; 1243 break; 1244 } 1245 msf = memdup_sockptr(optval, optlen); 1246 if (IS_ERR(msf)) { 1247 err = PTR_ERR(msf); 1248 break; 1249 } 1250 /* numsrc >= (1G-4) overflow in 32 bits */ 1251 if (msf->imsf_numsrc >= 0x3ffffffcU || 1252 msf->imsf_numsrc > READ_ONCE(net->ipv4.sysctl_igmp_max_msf)) { 1253 kfree(msf); 1254 err = -ENOBUFS; 1255 break; 1256 } 1257 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 1258 kfree(msf); 1259 err = -EINVAL; 1260 break; 1261 } 1262 err = ip_mc_msfilter(sk, msf, 0); 1263 kfree(msf); 1264 break; 1265 } 1266 case IP_BLOCK_SOURCE: 1267 case IP_UNBLOCK_SOURCE: 1268 case IP_ADD_SOURCE_MEMBERSHIP: 1269 case IP_DROP_SOURCE_MEMBERSHIP: 1270 { 1271 struct ip_mreq_source mreqs; 1272 int omode, add; 1273 1274 if (optlen != sizeof(struct ip_mreq_source)) 1275 goto e_inval; 1276 if (copy_from_sockptr(&mreqs, optval, sizeof(mreqs))) { 1277 err = -EFAULT; 1278 break; 1279 } 1280 if (optname == IP_BLOCK_SOURCE) { 1281 omode = MCAST_EXCLUDE; 1282 add = 1; 1283 } else if (optname == IP_UNBLOCK_SOURCE) { 1284 omode = MCAST_EXCLUDE; 1285 add = 0; 1286 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 1287 struct ip_mreqn mreq; 1288 1289 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 1290 mreq.imr_address.s_addr = mreqs.imr_interface; 1291 mreq.imr_ifindex = 0; 1292 err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); 1293 if (err && err != -EADDRINUSE) 1294 break; 1295 omode = MCAST_INCLUDE; 1296 add = 1; 1297 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 1298 omode = MCAST_INCLUDE; 1299 add = 0; 1300 } 1301 err = ip_mc_source(add, omode, sk, &mreqs, 0); 1302 break; 1303 } 1304 case MCAST_JOIN_GROUP: 1305 case MCAST_LEAVE_GROUP: 1306 if (in_compat_syscall()) 1307 err = compat_ip_mcast_join_leave(sk, optname, optval, 1308 optlen); 1309 else 1310 err = ip_mcast_join_leave(sk, optname, optval, optlen); 1311 break; 1312 case MCAST_JOIN_SOURCE_GROUP: 1313 case MCAST_LEAVE_SOURCE_GROUP: 1314 case MCAST_BLOCK_SOURCE: 1315 case MCAST_UNBLOCK_SOURCE: 1316 err = do_mcast_group_source(sk, optname, optval, optlen); 1317 break; 1318 case MCAST_MSFILTER: 1319 if (in_compat_syscall()) 1320 err = compat_ip_set_mcast_msfilter(sk, optval, optlen); 1321 else 1322 err = ip_set_mcast_msfilter(sk, optval, optlen); 1323 break; 1324 case IP_MULTICAST_ALL: 1325 if (optlen < 1) 1326 goto e_inval; 1327 if (val != 0 && val != 1) 1328 goto e_inval; 1329 inet->mc_all = val; 1330 break; 1331 1332 case IP_FREEBIND: 1333 if (optlen < 1) 1334 goto e_inval; 1335 inet->freebind = !!val; 1336 break; 1337 1338 case IP_IPSEC_POLICY: 1339 case IP_XFRM_POLICY: 1340 err = -EPERM; 1341 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1342 break; 1343 err = xfrm_user_policy(sk, optname, optval, optlen); 1344 break; 1345 1346 case IP_TRANSPARENT: 1347 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1348 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1349 err = -EPERM; 1350 break; 1351 } 1352 if (optlen < 1) 1353 goto e_inval; 1354 inet->transparent = !!val; 1355 break; 1356 1357 case IP_MINTTL: 1358 if (optlen < 1) 1359 goto e_inval; 1360 if (val < 0 || val > 255) 1361 goto e_inval; 1362 inet->min_ttl = val; 1363 break; 1364 1365 default: 1366 err = -ENOPROTOOPT; 1367 break; 1368 } 1369 release_sock(sk); 1370 if (needs_rtnl) 1371 rtnl_unlock(); 1372 return err; 1373 1374e_inval: 1375 release_sock(sk); 1376 if (needs_rtnl) 1377 rtnl_unlock(); 1378 return -EINVAL; 1379} 1380 1381/** 1382 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1383 * @sk: socket 1384 * @skb: buffer 1385 * 1386 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1387 * destination in skb->cb[] before dst drop. 1388 * This way, receiver doesn't make cache line misses to read rtable. 1389 */ 1390void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1391{ 1392 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1393 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1394 ipv6_sk_rxinfo(sk); 1395 1396 if (prepare && skb_rtable(skb)) { 1397 /* skb->cb is overloaded: prior to this point it is IP{6}CB 1398 * which has interface index (iif) as the first member of the 1399 * underlying inet{6}_skb_parm struct. This code then overlays 1400 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first 1401 * element so the iif is picked up from the prior IPCB. If iif 1402 * is the loopback interface, then return the sending interface 1403 * (e.g., process binds socket to eth0 for Tx which is 1404 * redirected to loopback in the rtable/dst). 1405 */ 1406 struct rtable *rt = skb_rtable(skb); 1407 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); 1408 1409 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) 1410 pktinfo->ipi_ifindex = inet_iif(skb); 1411 else if (l3slave && rt && rt->rt_iif) 1412 pktinfo->ipi_ifindex = rt->rt_iif; 1413 1414 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1415 } else { 1416 pktinfo->ipi_ifindex = 0; 1417 pktinfo->ipi_spec_dst.s_addr = 0; 1418 } 1419 skb_dst_drop(skb); 1420} 1421 1422int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1423 unsigned int optlen) 1424{ 1425 int err; 1426 1427 if (level != SOL_IP) 1428 return -ENOPROTOOPT; 1429 1430 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1431#if IS_ENABLED(CONFIG_BPFILTER_UMH) 1432 if (optname >= BPFILTER_IPT_SO_SET_REPLACE && 1433 optname < BPFILTER_IPT_SET_MAX) 1434 err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen); 1435#endif 1436#ifdef CONFIG_NETFILTER 1437 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1438 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1439 optname != IP_IPSEC_POLICY && 1440 optname != IP_XFRM_POLICY && 1441 !ip_mroute_opt(optname)) 1442 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1443#endif 1444 return err; 1445} 1446EXPORT_SYMBOL(ip_setsockopt); 1447 1448/* 1449 * Get the options. Note for future reference. The GET of IP options gets 1450 * the _received_ ones. The set sets the _sent_ ones. 1451 */ 1452 1453static bool getsockopt_needs_rtnl(int optname) 1454{ 1455 switch (optname) { 1456 case IP_MSFILTER: 1457 case MCAST_MSFILTER: 1458 return true; 1459 } 1460 return false; 1461} 1462 1463static int ip_get_mcast_msfilter(struct sock *sk, void __user *optval, 1464 int __user *optlen, int len) 1465{ 1466 const int size0 = offsetof(struct group_filter, gf_slist); 1467 struct group_filter __user *p = optval; 1468 struct group_filter gsf; 1469 int num; 1470 int err; 1471 1472 if (len < size0) 1473 return -EINVAL; 1474 if (copy_from_user(&gsf, p, size0)) 1475 return -EFAULT; 1476 1477 num = gsf.gf_numsrc; 1478 err = ip_mc_gsfget(sk, &gsf, p->gf_slist); 1479 if (err) 1480 return err; 1481 if (gsf.gf_numsrc < num) 1482 num = gsf.gf_numsrc; 1483 if (put_user(GROUP_FILTER_SIZE(num), optlen) || 1484 copy_to_user(p, &gsf, size0)) 1485 return -EFAULT; 1486 return 0; 1487} 1488 1489static int compat_ip_get_mcast_msfilter(struct sock *sk, void __user *optval, 1490 int __user *optlen, int len) 1491{ 1492 const int size0 = offsetof(struct compat_group_filter, gf_slist); 1493 struct compat_group_filter __user *p = optval; 1494 struct compat_group_filter gf32; 1495 struct group_filter gf; 1496 int num; 1497 int err; 1498 1499 if (len < size0) 1500 return -EINVAL; 1501 if (copy_from_user(&gf32, p, size0)) 1502 return -EFAULT; 1503 1504 gf.gf_interface = gf32.gf_interface; 1505 gf.gf_fmode = gf32.gf_fmode; 1506 num = gf.gf_numsrc = gf32.gf_numsrc; 1507 gf.gf_group = gf32.gf_group; 1508 1509 err = ip_mc_gsfget(sk, &gf, p->gf_slist); 1510 if (err) 1511 return err; 1512 if (gf.gf_numsrc < num) 1513 num = gf.gf_numsrc; 1514 len = GROUP_FILTER_SIZE(num) - (sizeof(gf) - sizeof(gf32)); 1515 if (put_user(len, optlen) || 1516 put_user(gf.gf_fmode, &p->gf_fmode) || 1517 put_user(gf.gf_numsrc, &p->gf_numsrc)) 1518 return -EFAULT; 1519 return 0; 1520} 1521 1522static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1523 char __user *optval, int __user *optlen) 1524{ 1525 struct inet_sock *inet = inet_sk(sk); 1526 bool needs_rtnl = getsockopt_needs_rtnl(optname); 1527 int val, err = 0; 1528 int len; 1529 1530 if (level != SOL_IP) 1531 return -EOPNOTSUPP; 1532 1533 if (ip_mroute_opt(optname)) 1534 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1535 1536 if (get_user(len, optlen)) 1537 return -EFAULT; 1538 if (len < 0) 1539 return -EINVAL; 1540 1541 if (needs_rtnl) 1542 rtnl_lock(); 1543 lock_sock(sk); 1544 1545 switch (optname) { 1546 case IP_OPTIONS: 1547 { 1548 unsigned char optbuf[sizeof(struct ip_options)+40]; 1549 struct ip_options *opt = (struct ip_options *)optbuf; 1550 struct ip_options_rcu *inet_opt; 1551 1552 inet_opt = rcu_dereference_protected(inet->inet_opt, 1553 lockdep_sock_is_held(sk)); 1554 opt->optlen = 0; 1555 if (inet_opt) 1556 memcpy(optbuf, &inet_opt->opt, 1557 sizeof(struct ip_options) + 1558 inet_opt->opt.optlen); 1559 release_sock(sk); 1560 1561 if (opt->optlen == 0) 1562 return put_user(0, optlen); 1563 1564 ip_options_undo(opt); 1565 1566 len = min_t(unsigned int, len, opt->optlen); 1567 if (put_user(len, optlen)) 1568 return -EFAULT; 1569 if (copy_to_user(optval, opt->__data, len)) 1570 return -EFAULT; 1571 return 0; 1572 } 1573 case IP_PKTINFO: 1574 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1575 break; 1576 case IP_RECVTTL: 1577 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1578 break; 1579 case IP_RECVTOS: 1580 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1581 break; 1582 case IP_RECVOPTS: 1583 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1584 break; 1585 case IP_RETOPTS: 1586 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1587 break; 1588 case IP_PASSSEC: 1589 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1590 break; 1591 case IP_RECVORIGDSTADDR: 1592 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1593 break; 1594 case IP_CHECKSUM: 1595 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; 1596 break; 1597 case IP_RECVFRAGSIZE: 1598 val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; 1599 break; 1600 case IP_TOS: 1601 val = inet->tos; 1602 break; 1603 case IP_TTL: 1604 { 1605 struct net *net = sock_net(sk); 1606 val = (inet->uc_ttl == -1 ? 1607 net->ipv4.sysctl_ip_default_ttl : 1608 inet->uc_ttl); 1609 break; 1610 } 1611 case IP_HDRINCL: 1612 val = inet->hdrincl; 1613 break; 1614 case IP_NODEFRAG: 1615 val = inet->nodefrag; 1616 break; 1617 case IP_BIND_ADDRESS_NO_PORT: 1618 val = inet->bind_address_no_port; 1619 break; 1620 case IP_MTU_DISCOVER: 1621 val = inet->pmtudisc; 1622 break; 1623 case IP_MTU: 1624 { 1625 struct dst_entry *dst; 1626 val = 0; 1627 dst = sk_dst_get(sk); 1628 if (dst) { 1629 val = dst_mtu(dst); 1630 dst_release(dst); 1631 } 1632 if (!val) { 1633 release_sock(sk); 1634 return -ENOTCONN; 1635 } 1636 break; 1637 } 1638 case IP_RECVERR: 1639 val = inet->recverr; 1640 break; 1641 case IP_RECVERR_RFC4884: 1642 val = inet->recverr_rfc4884; 1643 break; 1644 case IP_MULTICAST_TTL: 1645 val = inet->mc_ttl; 1646 break; 1647 case IP_MULTICAST_LOOP: 1648 val = inet->mc_loop; 1649 break; 1650 case IP_UNICAST_IF: 1651 val = (__force int)htonl((__u32) inet->uc_index); 1652 break; 1653 case IP_MULTICAST_IF: 1654 { 1655 struct in_addr addr; 1656 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1657 addr.s_addr = inet->mc_addr; 1658 release_sock(sk); 1659 1660 if (put_user(len, optlen)) 1661 return -EFAULT; 1662 if (copy_to_user(optval, &addr, len)) 1663 return -EFAULT; 1664 return 0; 1665 } 1666 case IP_MSFILTER: 1667 { 1668 struct ip_msfilter msf; 1669 1670 if (len < IP_MSFILTER_SIZE(0)) { 1671 err = -EINVAL; 1672 goto out; 1673 } 1674 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1675 err = -EFAULT; 1676 goto out; 1677 } 1678 err = ip_mc_msfget(sk, &msf, 1679 (struct ip_msfilter __user *)optval, optlen); 1680 goto out; 1681 } 1682 case MCAST_MSFILTER: 1683 if (in_compat_syscall()) 1684 err = compat_ip_get_mcast_msfilter(sk, optval, optlen, 1685 len); 1686 else 1687 err = ip_get_mcast_msfilter(sk, optval, optlen, len); 1688 goto out; 1689 case IP_MULTICAST_ALL: 1690 val = inet->mc_all; 1691 break; 1692 case IP_PKTOPTIONS: 1693 { 1694 struct msghdr msg; 1695 1696 release_sock(sk); 1697 1698 if (sk->sk_type != SOCK_STREAM) 1699 return -ENOPROTOOPT; 1700 1701 msg.msg_control_is_user = true; 1702 msg.msg_control_user = optval; 1703 msg.msg_controllen = len; 1704 msg.msg_flags = in_compat_syscall() ? MSG_CMSG_COMPAT : 0; 1705 1706 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1707 struct in_pktinfo info; 1708 1709 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1710 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1711 info.ipi_ifindex = inet->mc_index; 1712 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1713 } 1714 if (inet->cmsg_flags & IP_CMSG_TTL) { 1715 int hlim = inet->mc_ttl; 1716 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1717 } 1718 if (inet->cmsg_flags & IP_CMSG_TOS) { 1719 int tos = inet->rcv_tos; 1720 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1721 } 1722 len -= msg.msg_controllen; 1723 return put_user(len, optlen); 1724 } 1725 case IP_FREEBIND: 1726 val = inet->freebind; 1727 break; 1728 case IP_TRANSPARENT: 1729 val = inet->transparent; 1730 break; 1731 case IP_MINTTL: 1732 val = inet->min_ttl; 1733 break; 1734 case IP_PROTOCOL: 1735 val = inet_sk(sk)->inet_num; 1736 break; 1737 default: 1738 release_sock(sk); 1739 return -ENOPROTOOPT; 1740 } 1741 release_sock(sk); 1742 1743 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1744 unsigned char ucval = (unsigned char)val; 1745 len = 1; 1746 if (put_user(len, optlen)) 1747 return -EFAULT; 1748 if (copy_to_user(optval, &ucval, 1)) 1749 return -EFAULT; 1750 } else { 1751 len = min_t(unsigned int, sizeof(int), len); 1752 if (put_user(len, optlen)) 1753 return -EFAULT; 1754 if (copy_to_user(optval, &val, len)) 1755 return -EFAULT; 1756 } 1757 return 0; 1758 1759out: 1760 release_sock(sk); 1761 if (needs_rtnl) 1762 rtnl_unlock(); 1763 return err; 1764} 1765 1766int ip_getsockopt(struct sock *sk, int level, 1767 int optname, char __user *optval, int __user *optlen) 1768{ 1769 int err; 1770 1771 err = do_ip_getsockopt(sk, level, optname, optval, optlen); 1772 1773#if IS_ENABLED(CONFIG_BPFILTER_UMH) 1774 if (optname >= BPFILTER_IPT_SO_GET_INFO && 1775 optname < BPFILTER_IPT_GET_MAX) 1776 err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen); 1777#endif 1778#ifdef CONFIG_NETFILTER 1779 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1780 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1781 !ip_mroute_opt(optname)) { 1782 int len; 1783 1784 if (get_user(len, optlen)) 1785 return -EFAULT; 1786 1787 err = nf_getsockopt(sk, PF_INET, optname, optval, &len); 1788 if (err >= 0) 1789 err = put_user(len, optlen); 1790 return err; 1791 } 1792#endif 1793 return err; 1794} 1795EXPORT_SYMBOL(ip_getsockopt); 1796