| | 1 | /* |
| | 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| | 3 | * operating system. INET is implemented using the BSD Socket |
| | 4 | * interface as the means of communication with the user level. |
| | 5 | * |
| | 6 | * The IP to API glue. |
| | 7 | * |
| | 8 | * Authors: see ip.c |
| | 9 | * |
| | 10 | * Fixes: |
| | 11 | * Many : Split from ip.c , see ip.c for history. |
| | 12 | * Martin Mares : TOS setting fixed. |
| | 13 | * Alan Cox : Fixed a couple of oopses in Martin's |
| | 14 | * TOS tweaks. |
| | 15 | * Mike McLagan : Routing by source |
| | 16 | */ |
| | 17 | |
| | 18 | #include <linux/module.h> |
| | 19 | #include <linux/types.h> |
| | 20 | #include <linux/mm.h> |
| | 21 | #include <linux/skbuff.h> |
| | 22 | #include <linux/ip.h> |
| | 23 | #include <linux/icmp.h> |
| | 24 | #include <linux/inetdevice.h> |
| | 25 | #include <linux/netdevice.h> |
| | 26 | #include <linux/slab.h> |
| | 27 | #include <net/sock.h> |
| | 28 | #include <net/ip.h> |
| | 29 | #include <net/icmp.h> |
| | 30 | #include <net/tcp_states.h> |
| | 31 | #include <linux/udp.h> |
| | 32 | #include <linux/igmp.h> |
| | 33 | #include <linux/netfilter.h> |
| | 34 | #include <linux/route.h> |
| | 35 | #include <linux/mroute.h> |
| | 36 | #include <net/route.h> |
| | 37 | #include <net/xfrm.h> |
| | 38 | #include <net/compat.h> |
| | 39 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| | 40 | #include <net/transp_v6.h> |
| | 41 | #endif |
| | 42 | |
| | 43 | #include <linux/errqueue.h> |
| | 44 | #include <asm/uaccess.h> |
| | 45 | |
| | 46 | #define IP_CMSG_PKTINFO 1 |
| | 47 | #define IP_CMSG_TTL 2 |
| | 48 | #define IP_CMSG_TOS 4 |
| | 49 | #define IP_CMSG_RECVOPTS 8 |
| | 50 | #define IP_CMSG_RETOPTS 16 |
| | 51 | #define IP_CMSG_PASSSEC 32 |
| | 52 | #define IP_CMSG_ORIGDSTADDR 64 |
| | 53 | |
| | 54 | /* |
| | 55 | * SOL_IP control messages. |
| | 56 | */ |
| | 57 | |
| | 58 | static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
| | 59 | { |
| | 60 | struct in_pktinfo info; |
| | 61 | struct rtable *rt = skb_rtable(skb); |
| | 62 | |
| | 63 | info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
| | 64 | if (rt) { |
| | 65 | info.ipi_ifindex = rt->rt_iif; |
| | 66 | info.ipi_spec_dst.s_addr = rt->rt_spec_dst; |
| | 67 | } else { |
| | 68 | info.ipi_ifindex = 0; |
| | 69 | info.ipi_spec_dst.s_addr = 0; |
| | 70 | } |
| | 71 | |
| | 72 | put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); |
| | 73 | } |
| | 74 | |
| | 75 | static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) |
| | 76 | { |
| | 77 | int ttl = ip_hdr(skb)->ttl; |
| | 78 | put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
| | 79 | } |
| | 80 | |
| | 81 | static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) |
| | 82 | { |
| | 83 | put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
| | 84 | } |
| | 85 | |
| | 86 | static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) |
| | 87 | { |
| | 88 | if (IPCB(skb)->opt.optlen == 0) |
| | 89 | return; |
| | 90 | |
| | 91 | put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
| | 92 | ip_hdr(skb) + 1); |
| | 93 | } |
| | 94 | |
| | 95 | |
| | 96 | static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) |
| | 97 | { |
| | 98 | unsigned char optbuf[sizeof(struct ip_options) + 40]; |
| | 99 | struct ip_options * opt = (struct ip_options *)optbuf; |
| | 100 | |
| | 101 | if (IPCB(skb)->opt.optlen == 0) |
| | 102 | return; |
| | 103 | |
| | 104 | if (ip_options_echo(opt, skb)) { |
| | 105 | msg->msg_flags |= MSG_CTRUNC; |
| | 106 | return; |
| | 107 | } |
| | 108 | ip_options_undo(opt); |
| | 109 | |
| | 110 | put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); |
| | 111 | } |
| | 112 | |
| | 113 | static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
| | 114 | { |
| | 115 | char *secdata; |
| | 116 | u32 seclen, secid; |
| | 117 | int err; |
| | 118 | |
| | 119 | err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
| | 120 | if (err) |
| | 121 | return; |
| | 122 | |
| | 123 | err = security_secid_to_secctx(secid, &secdata, &seclen); |
| | 124 | if (err) |
| | 125 | return; |
| | 126 | |
| | 127 | put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); |
| | 128 | security_release_secctx(secdata, seclen); |
| | 129 | } |
| | 130 | |
| | 131 | static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
| | 132 | { |
| | 133 | struct sockaddr_in sin; |
| | 134 | struct iphdr *iph = ip_hdr(skb); |
| | 135 | __be16 *ports = (__be16 *)skb_transport_header(skb); |
| | 136 | |
| | 137 | if (skb_transport_offset(skb) + 4 > skb->len) |
| | 138 | return; |
| | 139 | |
| | 140 | /* All current transport protocols have the port numbers in the |
| | 141 | * first four bytes of the transport header and this function is |
| | 142 | * written with this assumption in mind. |
| | 143 | */ |
| | 144 | |
| | 145 | sin.sin_family = AF_INET; |
| | 146 | sin.sin_addr.s_addr = iph->daddr; |
| | 147 | sin.sin_port = ports[1]; |
| | 148 | memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); |
| | 149 | |
| | 150 | put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); |
| | 151 | } |
| | 152 | |
| | 153 | void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) |
| | 154 | { |
| | 155 | struct inet_sock *inet = inet_sk(skb->sk); |
| | 156 | unsigned flags = inet->cmsg_flags; |
| | 157 | |
| | 158 | /* Ordered by supposed usage frequency */ |
| | 159 | if (flags & 1) |
| | 160 | ip_cmsg_recv_pktinfo(msg, skb); |
| | 161 | if ((flags >>= 1) == 0) |
| | 162 | return; |
| | 163 | |
| | 164 | if (flags & 1) |
| | 165 | ip_cmsg_recv_ttl(msg, skb); |
| | 166 | if ((flags >>= 1) == 0) |
| | 167 | return; |
| | 168 | |
| | 169 | if (flags & 1) |
| | 170 | ip_cmsg_recv_tos(msg, skb); |
| | 171 | if ((flags >>= 1) == 0) |
| | 172 | return; |
| | 173 | |
| | 174 | if (flags & 1) |
| | 175 | ip_cmsg_recv_opts(msg, skb); |
| | 176 | if ((flags >>= 1) == 0) |
| | 177 | return; |
| | 178 | |
| | 179 | if (flags & 1) |
| | 180 | ip_cmsg_recv_retopts(msg, skb); |
| | 181 | if ((flags >>= 1) == 0) |
| | 182 | return; |
| | 183 | |
| | 184 | if (flags & 1) |
| | 185 | ip_cmsg_recv_security(msg, skb); |
| | 186 | |
| | 187 | if ((flags >>= 1) == 0) |
| | 188 | return; |
| | 189 | if (flags & 1) |
| | 190 | ip_cmsg_recv_dstaddr(msg, skb); |
| | 191 | |
| | 192 | } |
| | 193 | EXPORT_SYMBOL(ip_cmsg_recv); |
| | 194 | |
| | 195 | int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) |
| | 196 | { |
| | 197 | int err; |
| | 198 | struct cmsghdr *cmsg; |
| | 199 | |
| | 200 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { |
| | 201 | if (!CMSG_OK(msg, cmsg)) |
| | 202 | return -EINVAL; |
| | 203 | if (cmsg->cmsg_level != SOL_IP) |
| | 204 | continue; |
| | 205 | switch (cmsg->cmsg_type) { |
| | 206 | case IP_RETOPTS: |
| | 207 | err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); |
| | 208 | err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
| | 209 | err < 40 ? err : 40); |
| | 210 | if (err) |
| | 211 | return err; |
| | 212 | break; |
| | 213 | case IP_PKTINFO: |
| | 214 | { |
| | 215 | struct in_pktinfo *info; |
| | 216 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) |
| | 217 | return -EINVAL; |
| | 218 | info = (struct in_pktinfo *)CMSG_DATA(cmsg); |
| | 219 | ipc->oif = info->ipi_ifindex; |
| | 220 | ipc->addr = info->ipi_spec_dst.s_addr; |
| | 221 | break; |
| | 222 | } |
| | 223 | default: |
| | 224 | return -EINVAL; |
| | 225 | } |
| | 226 | } |
| | 227 | return 0; |
| | 228 | } |
| | 229 | |
| | 230 | |
| | 231 | /* Special input handler for packets caught by router alert option. |
| | 232 | They are selected only by protocol field, and then processed likely |
| | 233 | local ones; but only if someone wants them! Otherwise, router |
| | 234 | not running rsvpd will kill RSVP. |
| | 235 | |
| | 236 | It is user level problem, what it will make with them. |
| | 237 | I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), |
| | 238 | but receiver should be enough clever f.e. to forward mtrace requests, |
| | 239 | sent to multicast group to reach destination designated router. |
| | 240 | */ |
| | 241 | struct ip_ra_chain __rcu *ip_ra_chain; |
| | 242 | static DEFINE_SPINLOCK(ip_ra_lock); |
| | 243 | |
| | 244 | |
| | 245 | static void ip_ra_destroy_rcu(struct rcu_head *head) |
| | 246 | { |
| | 247 | struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
| | 248 | |
| | 249 | sock_put(ra->saved_sk); |
| | 250 | kfree(ra); |
| | 251 | } |
| | 252 | |
| | 253 | int ip_ra_control(struct sock *sk, unsigned char on, |
| | 254 | void (*destructor)(struct sock *)) |
| | 255 | { |
| | 256 | struct ip_ra_chain *ra, *new_ra; |
| | 257 | struct ip_ra_chain __rcu **rap; |
| | 258 | |
| | 259 | if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
| | 260 | return -EINVAL; |
| | 261 | |
| | 262 | new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; |
| | 263 | |
| | 264 | spin_lock_bh(&ip_ra_lock); |
| | 265 | for (rap = &ip_ra_chain; |
| | 266 | (ra = rcu_dereference_protected(*rap, |
| | 267 | lockdep_is_held(&ip_ra_lock))) != NULL; |
| | 268 | rap = &ra->next) { |
| | 269 | if (ra->sk == sk) { |
| | 270 | if (on) { |
| | 271 | spin_unlock_bh(&ip_ra_lock); |
| | 272 | kfree(new_ra); |
| | 273 | return -EADDRINUSE; |
| | 274 | } |
| | 275 | /* dont let ip_call_ra_chain() use sk again */ |
| | 276 | ra->sk = NULL; |
| | 277 | rcu_assign_pointer(*rap, ra->next); |
| | 278 | spin_unlock_bh(&ip_ra_lock); |
| | 279 | |
| | 280 | if (ra->destructor) |
| | 281 | ra->destructor(sk); |
| | 282 | /* |
| | 283 | * Delay sock_put(sk) and kfree(ra) after one rcu grace |
| | 284 | * period. This guarantee ip_call_ra_chain() dont need |
| | 285 | * to mess with socket refcounts. |
| | 286 | */ |
| | 287 | ra->saved_sk = sk; |
| | 288 | call_rcu(&ra->rcu, ip_ra_destroy_rcu); |
| | 289 | return 0; |
| | 290 | } |
| | 291 | } |
| | 292 | if (new_ra == NULL) { |
| | 293 | spin_unlock_bh(&ip_ra_lock); |
| | 294 | return -ENOBUFS; |
| | 295 | } |
| | 296 | new_ra->sk = sk; |
| | 297 | new_ra->destructor = destructor; |
| | 298 | |
| | 299 | new_ra->next = ra; |
| | 300 | rcu_assign_pointer(*rap, new_ra); |
| | 301 | sock_hold(sk); |
| | 302 | spin_unlock_bh(&ip_ra_lock); |
| | 303 | |
| | 304 | return 0; |
| | 305 | } |
| | 306 | |
| | 307 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
| | 308 | __be16 port, u32 info, u8 *payload) |
| | 309 | { |
| | 310 | struct sock_exterr_skb *serr; |
| | 311 | |
| | 312 | skb = skb_clone(skb, GFP_ATOMIC); |
| | 313 | if (!skb) |
| | 314 | return; |
| | 315 | |
| | 316 | serr = SKB_EXT_ERR(skb); |
| | 317 | serr->ee.ee_errno = err; |
| | 318 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; |
| | 319 | serr->ee.ee_type = icmp_hdr(skb)->type; |
| | 320 | serr->ee.ee_code = icmp_hdr(skb)->code; |
| | 321 | serr->ee.ee_pad = 0; |
| | 322 | serr->ee.ee_info = info; |
| | 323 | serr->ee.ee_data = 0; |
| | 324 | serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
| | 325 | skb_network_header(skb); |
| | 326 | serr->port = port; |
| | 327 | |
| | 328 | if (skb_pull(skb, payload - skb->data) != NULL) { |
| | 329 | skb_reset_transport_header(skb); |
| | 330 | if (sock_queue_err_skb(sk, skb) == 0) |
| | 331 | return; |
| | 332 | } |
| | 333 | kfree_skb(skb); |
| | 334 | } |
| | 335 | |
| | 336 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
| | 337 | { |
| | 338 | struct inet_sock *inet = inet_sk(sk); |
| | 339 | struct sock_exterr_skb *serr; |
| | 340 | struct iphdr *iph; |
| | 341 | struct sk_buff *skb; |
| | 342 | |
| | 343 | if (!inet->recverr) |
| | 344 | return; |
| | 345 | |
| | 346 | skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); |
| | 347 | if (!skb) |
| | 348 | return; |
| | 349 | |
| | 350 | skb_put(skb, sizeof(struct iphdr)); |
| | 351 | skb_reset_network_header(skb); |
| | 352 | iph = ip_hdr(skb); |
| | 353 | iph->daddr = daddr; |
| | 354 | |
| | 355 | serr = SKB_EXT_ERR(skb); |
| | 356 | serr->ee.ee_errno = err; |
| | 357 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; |
| | 358 | serr->ee.ee_type = 0; |
| | 359 | serr->ee.ee_code = 0; |
| | 360 | serr->ee.ee_pad = 0; |
| | 361 | serr->ee.ee_info = info; |
| | 362 | serr->ee.ee_data = 0; |
| | 363 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
| | 364 | serr->port = port; |
| | 365 | |
| | 366 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
| | 367 | skb_reset_transport_header(skb); |
| | 368 | |
| | 369 | if (sock_queue_err_skb(sk, skb)) |
| | 370 | kfree_skb(skb); |
| | 371 | } |
| | 372 | |
| | 373 | /* |
| | 374 | * Handle MSG_ERRQUEUE |
| | 375 | */ |
| | 376 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) |
| | 377 | { |
| | 378 | struct sock_exterr_skb *serr; |
| | 379 | struct sk_buff *skb, *skb2; |
| | 380 | struct sockaddr_in *sin; |
| | 381 | struct { |
| | 382 | struct sock_extended_err ee; |
| | 383 | struct sockaddr_in offender; |
| | 384 | } errhdr; |
| | 385 | int err; |
| | 386 | int copied; |
| | 387 | |
| | 388 | err = -EAGAIN; |
| | 389 | skb = skb_dequeue(&sk->sk_error_queue); |
| | 390 | if (skb == NULL) |
| | 391 | goto out; |
| | 392 | |
| | 393 | copied = skb->len; |
| | 394 | if (copied > len) { |
| | 395 | msg->msg_flags |= MSG_TRUNC; |
| | 396 | copied = len; |
| | 397 | } |
| | 398 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| | 399 | if (err) |
| | 400 | goto out_free_skb; |
| | 401 | |
| | 402 | sock_recv_timestamp(msg, sk, skb); |
| | 403 | |
| | 404 | serr = SKB_EXT_ERR(skb); |
| | 405 | |
| | 406 | sin = (struct sockaddr_in *)msg->msg_name; |
| | 407 | if (sin) { |
| | 408 | sin->sin_family = AF_INET; |
| | 409 | sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
| | 410 | serr->addr_offset); |
| | 411 | sin->sin_port = serr->port; |
| | 412 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| | 413 | } |
| | 414 | |
| | 415 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); |
| | 416 | sin = &errhdr.offender; |
| | 417 | sin->sin_family = AF_UNSPEC; |
| | 418 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { |
| | 419 | struct inet_sock *inet = inet_sk(sk); |
| | 420 | |
| | 421 | sin->sin_family = AF_INET; |
| | 422 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
| | 423 | sin->sin_port = 0; |
| | 424 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| | 425 | if (inet->cmsg_flags) |
| | 426 | ip_cmsg_recv(msg, skb); |
| | 427 | } |
| | 428 | |
| | 429 | put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); |
| | 430 | |
| | 431 | /* Now we could try to dump offended packet options */ |
| | 432 | |
| | 433 | msg->msg_flags |= MSG_ERRQUEUE; |
| | 434 | err = copied; |
| | 435 | |
| | 436 | /* Reset and regenerate socket error */ |
| | 437 | spin_lock_bh(&sk->sk_error_queue.lock); |
| | 438 | sk->sk_err = 0; |
| | 439 | skb2 = skb_peek(&sk->sk_error_queue); |
| | 440 | if (skb2 != NULL) { |
| | 441 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; |
| | 442 | spin_unlock_bh(&sk->sk_error_queue.lock); |
| | 443 | sk->sk_error_report(sk); |
| | 444 | } else |
| | 445 | spin_unlock_bh(&sk->sk_error_queue.lock); |
| | 446 | |
| | 447 | out_free_skb: |
| | 448 | kfree_skb(skb); |
| | 449 | out: |
| | 450 | return err; |
| | 451 | } |
| | 452 | |
| | 453 | |
| | 454 | /* |
| | 455 | * Socket option code for IP. This is the end of the line after any |
| | 456 | * TCP,UDP etc options on an IP socket. |
| | 457 | */ |
| | 458 | |
| | 459 | static int do_ip_setsockopt(struct sock *sk, int level, |
| | 460 | int optname, char __user *optval, unsigned int optlen) |
| | 461 | { |
| | 462 | struct inet_sock *inet = inet_sk(sk); |
| | 463 | int val = 0, err; |
| | 464 | |
| | 465 | if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | |
| | 466 | (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | |
| | 467 | (1<<IP_RETOPTS) | (1<<IP_TOS) | |
| | 468 | (1<<IP_TTL) | (1<<IP_HDRINCL) | |
| | 469 | (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | |
| | 470 | (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) | |
| | 471 | (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) | |
| | 472 | (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) || |
| | 473 | optname == IP_MULTICAST_TTL || |
| | 474 | optname == IP_MULTICAST_ALL || |
| | 475 | optname == IP_MULTICAST_LOOP || |
| | 476 | optname == IP_RECVORIGDSTADDR) { |
| | 477 | if (optlen >= sizeof(int)) { |
| | 478 | if (get_user(val, (int __user *) optval)) |
| | 479 | return -EFAULT; |
| | 480 | } else if (optlen >= sizeof(char)) { |
| | 481 | unsigned char ucval; |
| | 482 | |
| | 483 | if (get_user(ucval, (unsigned char __user *) optval)) |
| | 484 | return -EFAULT; |
| | 485 | val = (int) ucval; |
| | 486 | } |
| | 487 | } |
| | 488 | |
| | 489 | /* If optlen==0, it is equivalent to val == 0 */ |
| | 490 | |
| | 491 | if (ip_mroute_opt(optname)) |
| | 492 | return ip_mroute_setsockopt(sk, optname, optval, optlen); |
| | 493 | |
| | 494 | err = 0; |
| | 495 | lock_sock(sk); |
| | 496 | |
| | 497 | switch (optname) { |
| | 498 | case IP_OPTIONS: |
| | 499 | { |
| | 500 | struct ip_options *opt = NULL; |
| | 501 | if (optlen > 40) |
| | 502 | goto e_inval; |
| | 503 | err = ip_options_get_from_user(sock_net(sk), &opt, |
| | 504 | optval, optlen); |
| | 505 | if (err) |
| | 506 | break; |
| | 507 | if (inet->is_icsk) { |
| | 508 | struct inet_connection_sock *icsk = inet_csk(sk); |
| | 509 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| | 510 | if (sk->sk_family == PF_INET || |
| | 511 | (!((1 << sk->sk_state) & |
| | 512 | (TCPF_LISTEN | TCPF_CLOSE)) && |
| | 513 | inet->inet_daddr != LOOPBACK4_IPV6)) { |
| | 514 | #endif |
| | 515 | if (inet->opt) |
| | 516 | icsk->icsk_ext_hdr_len -= inet->opt->optlen; |
| | 517 | if (opt) |
| | 518 | icsk->icsk_ext_hdr_len += opt->optlen; |
| | 519 | icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
| | 520 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| | 521 | } |
| | 522 | #endif |
| | 523 | } |
| | 524 | opt = xchg(&inet->opt, opt); |
| | 525 | kfree(opt); |
| | 526 | break; |
| | 527 | } |
| | 528 | case IP_PKTINFO: |
| | 529 | if (val) |
| | 530 | inet->cmsg_flags |= IP_CMSG_PKTINFO; |
| | 531 | else |
| | 532 | inet->cmsg_flags &= ~IP_CMSG_PKTINFO; |
| | 533 | break; |
| | 534 | case IP_RECVTTL: |
| | 535 | if (val) |
| | 536 | inet->cmsg_flags |= IP_CMSG_TTL; |
| | 537 | else |
| | 538 | inet->cmsg_flags &= ~IP_CMSG_TTL; |
| | 539 | break; |
| | 540 | case IP_RECVTOS: |
| | 541 | if (val) |
| | 542 | inet->cmsg_flags |= IP_CMSG_TOS; |
| | 543 | else |
| | 544 | inet->cmsg_flags &= ~IP_CMSG_TOS; |
| | 545 | break; |
| | 546 | case IP_RECVOPTS: |
| | 547 | if (val) |
| | 548 | inet->cmsg_flags |= IP_CMSG_RECVOPTS; |
| | 549 | else |
| | 550 | inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; |
| | 551 | break; |
| | 552 | case IP_RETOPTS: |
| | 553 | if (val) |
| | 554 | inet->cmsg_flags |= IP_CMSG_RETOPTS; |
| | 555 | else |
| | 556 | inet->cmsg_flags &= ~IP_CMSG_RETOPTS; |
| | 557 | break; |
| | 558 | case IP_PASSSEC: |
| | 559 | if (val) |
| | 560 | inet->cmsg_flags |= IP_CMSG_PASSSEC; |
| | 561 | else |
| | 562 | inet->cmsg_flags &= ~IP_CMSG_PASSSEC; |
| | 563 | break; |
| | 564 | case IP_RECVORIGDSTADDR: |
| | 565 | if (val) |
| | 566 | inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; |
| | 567 | else |
| | 568 | inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; |
| | 569 | break; |
| | 570 | case IP_TOS: /* This sets both TOS and Precedence */ |
| | 571 | if (sk->sk_type == SOCK_STREAM) { |
| | 572 | val &= ~3; |
| | 573 | val |= inet->tos & 3; |
| | 574 | } |
| | 575 | if (inet->tos != val) { |
| | 576 | inet->tos = val; |
| | 577 | sk->sk_priority = rt_tos2priority(val); |
| | 578 | sk_dst_reset(sk); |
| | 579 | } |
| | 580 | break; |
| | 581 | case IP_TTL: |
| | 582 | if (optlen < 1) |
| | 583 | goto e_inval; |
| | 584 | if (val != -1 && (val < 0 || val > 255)) |
| | 585 | goto e_inval; |
| | 586 | inet->uc_ttl = val; |
| | 587 | break; |
| | 588 | case IP_HDRINCL: |
| | 589 | if (sk->sk_type != SOCK_RAW) { |
| | 590 | err = -ENOPROTOOPT; |
| | 591 | break; |
| | 592 | } |
| | 593 | inet->hdrincl = val ? 1 : 0; |
| | 594 | break; |
| | 595 | case IP_NODEFRAG: |
| | 596 | if (sk->sk_type != SOCK_RAW) { |
| | 597 | err = -ENOPROTOOPT; |
| | 598 | break; |
| | 599 | } |
| | 600 | inet->nodefrag = val ? 1 : 0; |
| | 601 | break; |
| | 602 | case IP_MTU_DISCOVER: |
| | 603 | if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE) |
| | 604 | goto e_inval; |
| | 605 | inet->pmtudisc = val; |
| | 606 | break; |
| | 607 | case IP_RECVERR: |
| | 608 | inet->recverr = !!val; |
| | 609 | if (!val) |
| | 610 | skb_queue_purge(&sk->sk_error_queue); |
| | 611 | break; |
| | 612 | case IP_MULTICAST_TTL: |
| | 613 | if (sk->sk_type == SOCK_STREAM) |
| | 614 | goto e_inval; |
| | 615 | if (optlen < 1) |
| | 616 | goto e_inval; |
| | 617 | if (val == -1) |
| | 618 | val = 1; |
| | 619 | if (val < 0 || val > 255) |
| | 620 | goto e_inval; |
| | 621 | inet->mc_ttl = val; |
| | 622 | break; |
| | 623 | case IP_MULTICAST_LOOP: |
| | 624 | if (optlen < 1) |
| | 625 | goto e_inval; |
| | 626 | inet->mc_loop = !!val; |
| | 627 | break; |
| | 628 | case IP_MULTICAST_IF: |
| | 629 | { |
| | 630 | struct ip_mreqn mreq; |
| | 631 | struct net_device *dev = NULL; |
| | 632 | |
| | 633 | if (sk->sk_type == SOCK_STREAM) |
| | 634 | goto e_inval; |
| | 635 | /* |
| | 636 | * Check the arguments are allowable |
| | 637 | */ |
| | 638 | |
| | 639 | if (optlen < sizeof(struct in_addr)) |
| | 640 | goto e_inval; |
| | 641 | |
| | 642 | err = -EFAULT; |
| | 643 | if (optlen >= sizeof(struct ip_mreqn)) { |
| | 644 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
| | 645 | break; |
| | 646 | } else { |
| | 647 | memset(&mreq, 0, sizeof(mreq)); |
| | 648 | if (optlen >= sizeof(struct in_addr) && |
| | 649 | copy_from_user(&mreq.imr_address, optval, |
| | 650 | sizeof(struct in_addr))) |
| | 651 | break; |
| | 652 | } |
| | 653 | |
| | 654 | if (!mreq.imr_ifindex) { |
| | 655 | if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
| | 656 | inet->mc_index = 0; |
| | 657 | inet->mc_addr = 0; |
| | 658 | err = 0; |
| | 659 | break; |
| | 660 | } |
| | 661 | dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
| | 662 | if (dev) |
| | 663 | mreq.imr_ifindex = dev->ifindex; |
| | 664 | } else |
| | 665 | dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
| | 666 | |
| | 667 | |
| | 668 | err = -EADDRNOTAVAIL; |
| | 669 | if (!dev) |
| | 670 | break; |
| | 671 | dev_put(dev); |
| | 672 | |
| | 673 | err = -EINVAL; |
| | 674 | if (sk->sk_bound_dev_if && |
| | 675 | mreq.imr_ifindex != sk->sk_bound_dev_if) |
| | 676 | break; |
| | 677 | |
| | 678 | inet->mc_index = mreq.imr_ifindex; |
| | 679 | inet->mc_addr = mreq.imr_address.s_addr; |
| | 680 | err = 0; |
| | 681 | break; |
| | 682 | } |
| | 683 | |
| | 684 | case IP_ADD_MEMBERSHIP: |
| | 685 | case IP_DROP_MEMBERSHIP: |
| | 686 | { |
| | 687 | struct ip_mreqn mreq; |
| | 688 | |
| | 689 | err = -EPROTO; |
| | 690 | if (inet_sk(sk)->is_icsk) |
| | 691 | break; |
| | 692 | |
| | 693 | if (optlen < sizeof(struct ip_mreq)) |
| | 694 | goto e_inval; |
| | 695 | err = -EFAULT; |
| | 696 | if (optlen >= sizeof(struct ip_mreqn)) { |
| | 697 | if (copy_from_user(&mreq, optval, sizeof(mreq))) |
| | 698 | break; |
| | 699 | } else { |
| | 700 | memset(&mreq, 0, sizeof(mreq)); |
| | 701 | if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
| | 702 | break; |
| | 703 | } |
| | 704 | |
| | 705 | if (optname == IP_ADD_MEMBERSHIP) |
| | 706 | err = ip_mc_join_group(sk, &mreq); |
| | 707 | else |
| | 708 | err = ip_mc_leave_group(sk, &mreq); |
| | 709 | break; |
| | 710 | } |
| | 711 | case IP_MSFILTER: |
| | 712 | { |
| | 713 | struct ip_msfilter *msf; |
| | 714 | |
| | 715 | if (optlen < IP_MSFILTER_SIZE(0)) |
| | 716 | goto e_inval; |
| | 717 | if (optlen > sysctl_optmem_max) { |
| | 718 | err = -ENOBUFS; |
| | 719 | break; |
| | 720 | } |
| | 721 | msf = kmalloc(optlen, GFP_KERNEL); |
| | 722 | if (!msf) { |
| | 723 | err = -ENOBUFS; |
| | 724 | break; |
| | 725 | } |
| | 726 | err = -EFAULT; |
| | 727 | if (copy_from_user(msf, optval, optlen)) { |
| | 728 | kfree(msf); |
| | 729 | break; |
| | 730 | } |
| | 731 | /* numsrc >= (1G-4) overflow in 32 bits */ |
| | 732 | if (msf->imsf_numsrc >= 0x3ffffffcU || |
| | 733 | msf->imsf_numsrc > sysctl_igmp_max_msf) { |
| | 734 | kfree(msf); |
| | 735 | err = -ENOBUFS; |
| | 736 | break; |
| | 737 | } |
| | 738 | if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { |
| | 739 | kfree(msf); |
| | 740 | err = -EINVAL; |
| | 741 | break; |
| | 742 | } |
| | 743 | err = ip_mc_msfilter(sk, msf, 0); |
| | 744 | kfree(msf); |
| | 745 | break; |
| | 746 | } |
| | 747 | case IP_BLOCK_SOURCE: |
| | 748 | case IP_UNBLOCK_SOURCE: |
| | 749 | case IP_ADD_SOURCE_MEMBERSHIP: |
| | 750 | case IP_DROP_SOURCE_MEMBERSHIP: |
| | 751 | { |
| | 752 | struct ip_mreq_source mreqs; |
| | 753 | int omode, add; |
| | 754 | |
| | 755 | if (optlen != sizeof(struct ip_mreq_source)) |
| | 756 | goto e_inval; |
| | 757 | if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { |
| | 758 | err = -EFAULT; |
| | 759 | break; |
| | 760 | } |
| | 761 | if (optname == IP_BLOCK_SOURCE) { |
| | 762 | omode = MCAST_EXCLUDE; |
| | 763 | add = 1; |
| | 764 | } else if (optname == IP_UNBLOCK_SOURCE) { |
| | 765 | omode = MCAST_EXCLUDE; |
| | 766 | add = 0; |
| | 767 | } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { |
| | 768 | struct ip_mreqn mreq; |
| | 769 | |
| | 770 | mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
| | 771 | mreq.imr_address.s_addr = mreqs.imr_interface; |
| | 772 | mreq.imr_ifindex = 0; |
| | 773 | err = ip_mc_join_group(sk, &mreq); |
| | 774 | if (err && err != -EADDRINUSE) |
| | 775 | break; |
| | 776 | omode = MCAST_INCLUDE; |
| | 777 | add = 1; |
| | 778 | } else /* IP_DROP_SOURCE_MEMBERSHIP */ { |
| | 779 | omode = MCAST_INCLUDE; |
| | 780 | add = 0; |
| | 781 | } |
| | 782 | err = ip_mc_source(add, omode, sk, &mreqs, 0); |
| | 783 | break; |
| | 784 | } |
| | 785 | case MCAST_JOIN_GROUP: |
| | 786 | case MCAST_LEAVE_GROUP: |
| | 787 | { |
| | 788 | struct group_req greq; |
| | 789 | struct sockaddr_in *psin; |
| | 790 | struct ip_mreqn mreq; |
| | 791 | |
| | 792 | if (optlen < sizeof(struct group_req)) |
| | 793 | goto e_inval; |
| | 794 | err = -EFAULT; |
| | 795 | if (copy_from_user(&greq, optval, sizeof(greq))) |
| | 796 | break; |
| | 797 | psin = (struct sockaddr_in *)&greq.gr_group; |
| | 798 | if (psin->sin_family != AF_INET) |
| | 799 | goto e_inval; |
| | 800 | memset(&mreq, 0, sizeof(mreq)); |
| | 801 | mreq.imr_multiaddr = psin->sin_addr; |
| | 802 | mreq.imr_ifindex = greq.gr_interface; |
| | 803 | |
| | 804 | if (optname == MCAST_JOIN_GROUP) |
| | 805 | err = ip_mc_join_group(sk, &mreq); |
| | 806 | else |
| | 807 | err = ip_mc_leave_group(sk, &mreq); |
| | 808 | break; |
| | 809 | } |
| | 810 | case MCAST_JOIN_SOURCE_GROUP: |
| | 811 | case MCAST_LEAVE_SOURCE_GROUP: |
| | 812 | case MCAST_BLOCK_SOURCE: |
| | 813 | case MCAST_UNBLOCK_SOURCE: |
| | 814 | { |
| | 815 | struct group_source_req greqs; |
| | 816 | struct ip_mreq_source mreqs; |
| | 817 | struct sockaddr_in *psin; |
| | 818 | int omode, add; |
| | 819 | |
| | 820 | if (optlen != sizeof(struct group_source_req)) |
| | 821 | goto e_inval; |
| | 822 | if (copy_from_user(&greqs, optval, sizeof(greqs))) { |
| | 823 | err = -EFAULT; |
| | 824 | break; |
| | 825 | } |
| | 826 | if (greqs.gsr_group.ss_family != AF_INET || |
| | 827 | greqs.gsr_source.ss_family != AF_INET) { |
| | 828 | err = -EADDRNOTAVAIL; |
| | 829 | break; |
| | 830 | } |
| | 831 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
| | 832 | mreqs.imr_multiaddr = psin->sin_addr.s_addr; |
| | 833 | psin = (struct sockaddr_in *)&greqs.gsr_source; |
| | 834 | mreqs.imr_sourceaddr = psin->sin_addr.s_addr; |
| | 835 | mreqs.imr_interface = 0; /* use index for mc_source */ |
| | 836 | |
| | 837 | if (optname == MCAST_BLOCK_SOURCE) { |
| | 838 | omode = MCAST_EXCLUDE; |
| | 839 | add = 1; |
| | 840 | } else if (optname == MCAST_UNBLOCK_SOURCE) { |
| | 841 | omode = MCAST_EXCLUDE; |
| | 842 | add = 0; |
| | 843 | } else if (optname == MCAST_JOIN_SOURCE_GROUP) { |
| | 844 | struct ip_mreqn mreq; |
| | 845 | |
| | 846 | psin = (struct sockaddr_in *)&greqs.gsr_group; |
| | 847 | mreq.imr_multiaddr = psin->sin_addr; |
| | 848 | mreq.imr_address.s_addr = 0; |
| | 849 | mreq.imr_ifindex = greqs.gsr_interface; |
| | 850 | err = ip_mc_join_group(sk, &mreq); |
| | 851 | if (err && err != -EADDRINUSE) |
| | 852 | break; |
| | 853 | greqs.gsr_interface = mreq.imr_ifindex; |
| | 854 | omode = MCAST_INCLUDE; |
| | 855 | add = 1; |
| | 856 | } else /* MCAST_LEAVE_SOURCE_GROUP */ { |
| | 857 | omode = MCAST_INCLUDE; |
| | 858 | add = 0; |
| | 859 | } |
| | 860 | err = ip_mc_source(add, omode, sk, &mreqs, |
| | 861 | greqs.gsr_interface); |
| | 862 | break; |
| | 863 | } |
| | 864 | case MCAST_MSFILTER: |
| | 865 | { |
| | 866 | struct sockaddr_in *psin; |
| | 867 | struct ip_msfilter *msf = NULL; |
| | 868 | struct group_filter *gsf = NULL; |
| | 869 | int msize, i, ifindex; |
| | 870 | |
| | 871 | if (optlen < GROUP_FILTER_SIZE(0)) |
| | 872 | goto e_inval; |
| | 873 | if (optlen > sysctl_optmem_max) { |
| | 874 | err = -ENOBUFS; |
| | 875 | break; |
| | 876 | } |
| | 877 | gsf = kmalloc(optlen, GFP_KERNEL); |
| | 878 | if (!gsf) { |
| | 879 | err = -ENOBUFS; |
| | 880 | break; |
| | 881 | } |
| | 882 | err = -EFAULT; |
| | 883 | if (copy_from_user(gsf, optval, optlen)) |
| | 884 | goto mc_msf_out; |
| | 885 | |
| | 886 | /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
| | 887 | if (gsf->gf_numsrc >= 0x1ffffff || |
| | 888 | gsf->gf_numsrc > sysctl_igmp_max_msf) { |
| | 889 | err = -ENOBUFS; |
| | 890 | goto mc_msf_out; |
| | 891 | } |
| | 892 | if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { |
| | 893 | err = -EINVAL; |
| | 894 | goto mc_msf_out; |
| | 895 | } |
| | 896 | msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); |
| | 897 | msf = kmalloc(msize, GFP_KERNEL); |
| | 898 | if (!msf) { |
| | 899 | err = -ENOBUFS; |
| | 900 | goto mc_msf_out; |
| | 901 | } |
| | 902 | ifindex = gsf->gf_interface; |
| | 903 | psin = (struct sockaddr_in *)&gsf->gf_group; |
| | 904 | if (psin->sin_family != AF_INET) { |
| | 905 | err = -EADDRNOTAVAIL; |
| | 906 | goto mc_msf_out; |
| | 907 | } |
| | 908 | msf->imsf_multiaddr = psin->sin_addr.s_addr; |
| | 909 | msf->imsf_interface = 0; |
| | 910 | msf->imsf_fmode = gsf->gf_fmode; |
| | 911 | msf->imsf_numsrc = gsf->gf_numsrc; |
| | 912 | err = -EADDRNOTAVAIL; |
| | 913 | for (i = 0; i < gsf->gf_numsrc; ++i) { |
| | 914 | psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
| | 915 | |
| | 916 | if (psin->sin_family != AF_INET) |
| | 917 | goto mc_msf_out; |
| | 918 | msf->imsf_slist[i] = psin->sin_addr.s_addr; |
| | 919 | } |
| | 920 | kfree(gsf); |
| | 921 | gsf = NULL; |
| | 922 | |
| | 923 | err = ip_mc_msfilter(sk, msf, ifindex); |
| | 924 | mc_msf_out: |
| | 925 | kfree(msf); |
| | 926 | kfree(gsf); |
| | 927 | break; |
| | 928 | } |
| | 929 | case IP_MULTICAST_ALL: |
| | 930 | if (optlen < 1) |
| | 931 | goto e_inval; |
| | 932 | if (val != 0 && val != 1) |
| | 933 | goto e_inval; |
| | 934 | inet->mc_all = val; |
| | 935 | break; |
| | 936 | case IP_ROUTER_ALERT: |
| | 937 | err = ip_ra_control(sk, val ? 1 : 0, NULL); |
| | 938 | break; |
| | 939 | |
| | 940 | case IP_FREEBIND: |
| | 941 | if (optlen < 1) |
| | 942 | goto e_inval; |
| | 943 | inet->freebind = !!val; |
| | 944 | break; |
| | 945 | |
| | 946 | case IP_IPSEC_POLICY: |
| | 947 | case IP_XFRM_POLICY: |
| | 948 | err = -EPERM; |
| | 949 | if (!capable(CAP_NET_ADMIN)) |
| | 950 | break; |
| | 951 | err = xfrm_user_policy(sk, optname, optval, optlen); |
| | 952 | break; |
| | 953 | |
| | 954 | case IP_TRANSPARENT: |
| | 955 | if (!capable(CAP_NET_ADMIN)) { |
| | 956 | err = -EPERM; |
| | 957 | break; |
| | 958 | } |
| | 959 | if (optlen < 1) |
| | 960 | goto e_inval; |
| | 961 | inet->transparent = !!val; |
| | 962 | break; |
| | 963 | |
| | 964 | case IP_MINTTL: |
| | 965 | if (optlen < 1) |
| | 966 | goto e_inval; |
| | 967 | if (val < 0 || val > 255) |
| | 968 | goto e_inval; |
| | 969 | inet->min_ttl = val; |
| | 970 | break; |
| | 971 | |
| | 972 | default: |
| | 973 | err = -ENOPROTOOPT; |
| | 974 | break; |
| | 975 | } |
| | 976 | release_sock(sk); |
| | 977 | return err; |
| | 978 | |
| | 979 | e_inval: |
| | 980 | release_sock(sk); |
| | 981 | return -EINVAL; |
| | 982 | } |
| | 983 | |
| | 984 | /** |
| | 985 | * ip_queue_rcv_skb - Queue an skb into sock receive queue |
| | 986 | * @sk: socket |
| | 987 | * @skb: buffer |
| | 988 | * |
| | 989 | * Queues an skb into socket receive queue. If IP_CMSG_PKTINFO option |
| | 990 | * is not set, we drop skb dst entry now, while dst cache line is hot. |
| | 991 | */ |
| | 992 | int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| | 993 | { |
| | 994 | if (!(inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO)) |
| | 995 | skb_dst_drop(skb); |
| | 996 | return sock_queue_rcv_skb(sk, skb); |
| | 997 | } |
| | 998 | EXPORT_SYMBOL(ip_queue_rcv_skb); |
| | 999 | |
| | 1000 | int ip_setsockopt(struct sock *sk, int level, |
| | 1001 | int optname, char __user *optval, unsigned int optlen) |
| | 1002 | { |
| | 1003 | int err; |
| | 1004 | |
| | 1005 | if (level != SOL_IP) |
| | 1006 | return -ENOPROTOOPT; |
| | 1007 | |
| | 1008 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
| | 1009 | #ifdef CONFIG_NETFILTER |
| | 1010 | /* we need to exclude all possible ENOPROTOOPTs except default case */ |
| | 1011 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && |
| | 1012 | optname != IP_IPSEC_POLICY && |
| | 1013 | optname != IP_XFRM_POLICY && |
| | 1014 | !ip_mroute_opt(optname)) { |
| | 1015 | lock_sock(sk); |
| | 1016 | err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); |
| | 1017 | release_sock(sk); |
| | 1018 | } |
| | 1019 | #endif |
| | 1020 | return err; |
| | 1021 | } |
| | 1022 | EXPORT_SYMBOL(ip_setsockopt); |
| | 1023 | |
| | 1024 | #ifdef CONFIG_COMPAT |
| | 1025 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
| | 1026 | char __user *optval, unsigned int optlen) |
| | 1027 | { |
| | 1028 | int err; |
| | 1029 | |
| | 1030 | if (level != SOL_IP) |
| | 1031 | return -ENOPROTOOPT; |
| | 1032 | |
| | 1033 | if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
| | 1034 | return compat_mc_setsockopt(sk, level, optname, optval, optlen, |
| | 1035 | ip_setsockopt); |
| | 1036 | |
| | 1037 | err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
| | 1038 | #ifdef CONFIG_NETFILTER |
| | 1039 | /* we need to exclude all possible ENOPROTOOPTs except default case */ |
| | 1040 | if (err == -ENOPROTOOPT && optname != IP_HDRINCL && |
| | 1041 | optname != IP_IPSEC_POLICY && |
| | 1042 | optname != IP_XFRM_POLICY && |
| | 1043 | !ip_mroute_opt(optname)) { |
| | 1044 | lock_sock(sk); |
| | 1045 | err = compat_nf_setsockopt(sk, PF_INET, optname, |
| | 1046 | optval, optlen); |
| | 1047 | release_sock(sk); |
| | 1048 | } |
| | 1049 | #endif |
| | 1050 | return err; |
| | 1051 | } |
| | 1052 | EXPORT_SYMBOL(compat_ip_setsockopt); |
| | 1053 | #endif |
| | 1054 | |
| | 1055 | /* |
| | 1056 | * Get the options. Note for future reference. The GET of IP options gets |
| | 1057 | * the _received_ ones. The set sets the _sent_ ones. |
| | 1058 | */ |
| | 1059 | |
| | 1060 | static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
| | 1061 | char __user *optval, int __user *optlen) |
| | 1062 | { |
| | 1063 | struct inet_sock *inet = inet_sk(sk); |
| | 1064 | int val; |
| | 1065 | int len; |
| | 1066 | |
| | 1067 | if (level != SOL_IP) |
| | 1068 | return -EOPNOTSUPP; |
| | 1069 | |
| | 1070 | if (ip_mroute_opt(optname)) |
| | 1071 | return ip_mroute_getsockopt(sk, optname, optval, optlen); |
| | 1072 | |
| | 1073 | if (get_user(len, optlen)) |
| | 1074 | return -EFAULT; |
| | 1075 | if (len < 0) |
| | 1076 | return -EINVAL; |
| | 1077 | |
| | 1078 | lock_sock(sk); |
| | 1079 | |
| | 1080 | switch (optname) { |
| | 1081 | case IP_OPTIONS: |
| | 1082 | { |
| | 1083 | unsigned char optbuf[sizeof(struct ip_options)+40]; |
| | 1084 | struct ip_options * opt = (struct ip_options *)optbuf; |
| | 1085 | opt->optlen = 0; |
| | 1086 | if (inet->opt) |
| | 1087 | memcpy(optbuf, inet->opt, |
| | 1088 | sizeof(struct ip_options)+ |
| | 1089 | inet->opt->optlen); |
| | 1090 | release_sock(sk); |
| | 1091 | |
| | 1092 | if (opt->optlen == 0) |
| | 1093 | return put_user(0, optlen); |
| | 1094 | |
| | 1095 | ip_options_undo(opt); |
| | 1096 | |
| | 1097 | len = min_t(unsigned int, len, opt->optlen); |
| | 1098 | if (put_user(len, optlen)) |
| | 1099 | return -EFAULT; |
| | 1100 | if (copy_to_user(optval, opt->__data, len)) |
| | 1101 | return -EFAULT; |
| | 1102 | return 0; |
| | 1103 | } |
| | 1104 | case IP_PKTINFO: |
| | 1105 | val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; |
| | 1106 | break; |
| | 1107 | case IP_RECVTTL: |
| | 1108 | val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; |
| | 1109 | break; |
| | 1110 | case IP_RECVTOS: |
| | 1111 | val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; |
| | 1112 | break; |
| | 1113 | case IP_RECVOPTS: |
| | 1114 | val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; |
| | 1115 | break; |
| | 1116 | case IP_RETOPTS: |
| | 1117 | val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; |
| | 1118 | break; |
| | 1119 | case IP_PASSSEC: |
| | 1120 | val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; |
| | 1121 | break; |
| | 1122 | case IP_RECVORIGDSTADDR: |
| | 1123 | val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; |
| | 1124 | break; |
| | 1125 | case IP_TOS: |
| | 1126 | val = inet->tos; |
| | 1127 | break; |
| | 1128 | case IP_TTL: |
| | 1129 | val = (inet->uc_ttl == -1 ? |
| | 1130 | sysctl_ip_default_ttl : |
| | 1131 | inet->uc_ttl); |
| | 1132 | break; |
| | 1133 | case IP_HDRINCL: |
| | 1134 | val = inet->hdrincl; |
| | 1135 | break; |
| | 1136 | case IP_NODEFRAG: |
| | 1137 | val = inet->nodefrag; |
| | 1138 | break; |
| | 1139 | case IP_MTU_DISCOVER: |
| | 1140 | val = inet->pmtudisc; |
| | 1141 | break; |
| | 1142 | case IP_MTU: |
| | 1143 | { |
| | 1144 | struct dst_entry *dst; |
| | 1145 | val = 0; |
| | 1146 | dst = sk_dst_get(sk); |
| | 1147 | if (dst) { |
| | 1148 | val = dst_mtu(dst); |
| | 1149 | dst_release(dst); |
| | 1150 | } |
| | 1151 | if (!val) { |
| | 1152 | release_sock(sk); |
| | 1153 | return -ENOTCONN; |
| | 1154 | } |
| | 1155 | break; |
| | 1156 | } |
| | 1157 | case IP_RECVERR: |
| | 1158 | val = inet->recverr; |
| | 1159 | break; |
| | 1160 | case IP_MULTICAST_TTL: |
| | 1161 | val = inet->mc_ttl; |
| | 1162 | break; |
| | 1163 | case IP_MULTICAST_LOOP: |
| | 1164 | val = inet->mc_loop; |
| | 1165 | break; |
| | 1166 | case IP_MULTICAST_IF: |
| | 1167 | { |
| | 1168 | struct in_addr addr; |
| | 1169 | len = min_t(unsigned int, len, sizeof(struct in_addr)); |
| | 1170 | addr.s_addr = inet->mc_addr; |
| | 1171 | release_sock(sk); |
| | 1172 | |
| | 1173 | if (put_user(len, optlen)) |
| | 1174 | return -EFAULT; |
| | 1175 | if (copy_to_user(optval, &addr, len)) |
| | 1176 | return -EFAULT; |
| | 1177 | return 0; |
| | 1178 | } |
| | 1179 | case IP_MSFILTER: |
| | 1180 | { |
| | 1181 | struct ip_msfilter msf; |
| | 1182 | int err; |
| | 1183 | |
| | 1184 | if (len < IP_MSFILTER_SIZE(0)) { |
| | 1185 | release_sock(sk); |
| | 1186 | return -EINVAL; |
| | 1187 | } |
| | 1188 | if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
| | 1189 | release_sock(sk); |
| | 1190 | return -EFAULT; |
| | 1191 | } |
| | 1192 | err = ip_mc_msfget(sk, &msf, |
| | 1193 | (struct ip_msfilter __user *)optval, optlen); |
| | 1194 | release_sock(sk); |
| | 1195 | return err; |
| | 1196 | } |
| | 1197 | case MCAST_MSFILTER: |
| | 1198 | { |
| | 1199 | struct group_filter gsf; |
| | 1200 | int err; |
| | 1201 | |
| | 1202 | if (len < GROUP_FILTER_SIZE(0)) { |
| | 1203 | release_sock(sk); |
| | 1204 | return -EINVAL; |
| | 1205 | } |
| | 1206 | if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { |
| | 1207 | release_sock(sk); |
| | 1208 | return -EFAULT; |
| | 1209 | } |
| | 1210 | err = ip_mc_gsfget(sk, &gsf, |
| | 1211 | (struct group_filter __user *)optval, |
| | 1212 | optlen); |
| | 1213 | release_sock(sk); |
| | 1214 | return err; |
| | 1215 | } |
| | 1216 | case IP_MULTICAST_ALL: |
| | 1217 | val = inet->mc_all; |
| | 1218 | break; |
| | 1219 | case IP_PKTOPTIONS: |
| | 1220 | { |
| | 1221 | struct msghdr msg; |
| | 1222 | |
| | 1223 | release_sock(sk); |
| | 1224 | |
| | 1225 | if (sk->sk_type != SOCK_STREAM) |
| | 1226 | return -ENOPROTOOPT; |
| | 1227 | |
| | 1228 | msg.msg_control = optval; |
| | 1229 | msg.msg_controllen = len; |
| | 1230 | msg.msg_flags = 0; |
| | 1231 | |
| | 1232 | if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
| | 1233 | struct in_pktinfo info; |
| | 1234 | |
| | 1235 | info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
| | 1236 | info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; |
| | 1237 | info.ipi_ifindex = inet->mc_index; |
| | 1238 | put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); |
| | 1239 | } |
| | 1240 | if (inet->cmsg_flags & IP_CMSG_TTL) { |
| | 1241 | int hlim = inet->mc_ttl; |
| | 1242 | put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); |
| | 1243 | } |
| | 1244 | len -= msg.msg_controllen; |
| | 1245 | return put_user(len, optlen); |
| | 1246 | } |
| | 1247 | case IP_FREEBIND: |
| | 1248 | val = inet->freebind; |
| | 1249 | break; |
| | 1250 | case IP_TRANSPARENT: |
| | 1251 | val = inet->transparent; |
| | 1252 | break; |
| | 1253 | case IP_MINTTL: |
| | 1254 | val = inet->min_ttl; |
| | 1255 | break; |
| | 1256 | default: |
| | 1257 | release_sock(sk); |
| | 1258 | return -ENOPROTOOPT; |
| | 1259 | } |
| | 1260 | release_sock(sk); |
| | 1261 | |
| | 1262 | if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
| | 1263 | unsigned char ucval = (unsigned char)val; |
| | 1264 | len = 1; |
| | 1265 | if (put_user(len, optlen)) |
| | 1266 | return -EFAULT; |
| | 1267 | if (copy_to_user(optval, &ucval, 1)) |
| | 1268 | return -EFAULT; |
| | 1269 | } else { |
| | 1270 | len = min_t(unsigned int, sizeof(int), len); |
| | 1271 | if (put_user(len, optlen)) |
| | 1272 | return -EFAULT; |
| | 1273 | if (copy_to_user(optval, &val, len)) |
| | 1274 | return -EFAULT; |
| | 1275 | } |
| | 1276 | return 0; |
| | 1277 | } |
| | 1278 | |
| | 1279 | int ip_getsockopt(struct sock *sk, int level, |
| | 1280 | int optname, char __user *optval, int __user *optlen) |
| | 1281 | { |
| | 1282 | int err; |
| | 1283 | |
| | 1284 | err = do_ip_getsockopt(sk, level, optname, optval, optlen); |
| | 1285 | #ifdef CONFIG_NETFILTER |
| | 1286 | /* we need to exclude all possible ENOPROTOOPTs except default case */ |
| | 1287 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
| | 1288 | !ip_mroute_opt(optname)) { |
| | 1289 | int len; |
| | 1290 | |
| | 1291 | if (get_user(len, optlen)) |
| | 1292 | return -EFAULT; |
| | 1293 | |
| | 1294 | lock_sock(sk); |
| | 1295 | err = nf_getsockopt(sk, PF_INET, optname, optval, |
| | 1296 | &len); |
| | 1297 | release_sock(sk); |
| | 1298 | if (err >= 0) |
| | 1299 | err = put_user(len, optlen); |
| | 1300 | return err; |
| | 1301 | } |
| | 1302 | #endif |
| | 1303 | return err; |
| | 1304 | } |
| | 1305 | EXPORT_SYMBOL(ip_getsockopt); |
| | 1306 | |
| | 1307 | #ifdef CONFIG_COMPAT |
| | 1308 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
| | 1309 | char __user *optval, int __user *optlen) |
| | 1310 | { |
| | 1311 | int err; |
| | 1312 | |
| | 1313 | if (optname == MCAST_MSFILTER) |
| | 1314 | return compat_mc_getsockopt(sk, level, optname, optval, optlen, |
| | 1315 | ip_getsockopt); |
| | 1316 | |
| | 1317 | err = do_ip_getsockopt(sk, level, optname, optval, optlen); |
| | 1318 | |
| | 1319 | #ifdef CONFIG_NETFILTER |
| | 1320 | /* we need to exclude all possible ENOPROTOOPTs except default case */ |
| | 1321 | if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
| | 1322 | !ip_mroute_opt(optname)) { |
| | 1323 | int len; |
| | 1324 | |
| | 1325 | if (get_user(len, optlen)) |
| | 1326 | return -EFAULT; |
| | 1327 | |
| | 1328 | lock_sock(sk); |
| | 1329 | err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
| | 1330 | release_sock(sk); |
| | 1331 | if (err >= 0) |
| | 1332 | err = put_user(len, optlen); |
| | 1333 | return err; |
| | 1334 | } |
| | 1335 | #endif |
| | 1336 | return err; |
| | 1337 | } |
| | 1338 | EXPORT_SYMBOL(compat_ip_getsockopt); |
| | 1339 | #endif |
git://bbs.cooldavid.org / net-next-2.6.git / blame_incremental