Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * RAW - implementation of IP "raw" sockets. |
| 7 | * |
| 8 | * Version: $Id: raw.c,v 1.64 2002/02/01 22:01:04 davem Exp $ |
| 9 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 10 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 12 | * |
| 13 | * Fixes: |
| 14 | * Alan Cox : verify_area() fixed up |
| 15 | * Alan Cox : ICMP error handling |
| 16 | * Alan Cox : EMSGSIZE if you send too big a packet |
| 17 | * Alan Cox : Now uses generic datagrams and shared |
| 18 | * skbuff library. No more peek crashes, |
| 19 | * no more backlogs |
| 20 | * Alan Cox : Checks sk->broadcast. |
| 21 | * Alan Cox : Uses skb_free_datagram/skb_copy_datagram |
| 22 | * Alan Cox : Raw passes ip options too |
| 23 | * Alan Cox : Setsocketopt added |
| 24 | * Alan Cox : Fixed error return for broadcasts |
| 25 | * Alan Cox : Removed wake_up calls |
| 26 | * Alan Cox : Use ttl/tos |
| 27 | * Alan Cox : Cleaned up old debugging |
| 28 | * Alan Cox : Use new kernel side addresses |
| 29 | * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets. |
| 30 | * Alan Cox : BSD style RAW socket demultiplexing. |
| 31 | * Alan Cox : Beginnings of mrouted support. |
| 32 | * Alan Cox : Added IP_HDRINCL option. |
| 33 | * Alan Cox : Skip broadcast check if BSDism set. |
| 34 | * David S. Miller : New socket lookup architecture. |
| 35 | * |
| 36 | * This program is free software; you can redistribute it and/or |
| 37 | * modify it under the terms of the GNU General Public License |
| 38 | * as published by the Free Software Foundation; either version |
| 39 | * 2 of the License, or (at your option) any later version. |
| 40 | */ |
Dave Jones | bf0d524 | 2006-09-22 14:00:29 -0700 | [diff] [blame] | 41 | |
Alan Cox | 715b49e | 2006-01-18 17:44:07 -0800 | [diff] [blame] | 42 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <asm/atomic.h> |
| 44 | #include <asm/byteorder.h> |
| 45 | #include <asm/current.h> |
| 46 | #include <asm/uaccess.h> |
| 47 | #include <asm/ioctls.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include <linux/stddef.h> |
| 49 | #include <linux/slab.h> |
| 50 | #include <linux/errno.h> |
| 51 | #include <linux/aio.h> |
| 52 | #include <linux/kernel.h> |
| 53 | #include <linux/spinlock.h> |
| 54 | #include <linux/sockios.h> |
| 55 | #include <linux/socket.h> |
| 56 | #include <linux/in.h> |
| 57 | #include <linux/mroute.h> |
| 58 | #include <linux/netdevice.h> |
| 59 | #include <linux/in_route.h> |
| 60 | #include <linux/route.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #include <linux/skbuff.h> |
| 62 | #include <net/dst.h> |
| 63 | #include <net/sock.h> |
| 64 | #include <linux/gfp.h> |
| 65 | #include <linux/ip.h> |
| 66 | #include <linux/net.h> |
| 67 | #include <net/ip.h> |
| 68 | #include <net/icmp.h> |
| 69 | #include <net/udp.h> |
| 70 | #include <net/raw.h> |
| 71 | #include <net/snmp.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 72 | #include <net/tcp_states.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | #include <net/inet_common.h> |
| 74 | #include <net/checksum.h> |
| 75 | #include <net/xfrm.h> |
| 76 | #include <linux/rtnetlink.h> |
| 77 | #include <linux/proc_fs.h> |
| 78 | #include <linux/seq_file.h> |
| 79 | #include <linux/netfilter.h> |
| 80 | #include <linux/netfilter_ipv4.h> |
| 81 | |
| 82 | struct hlist_head raw_v4_htable[RAWV4_HTABLE_SIZE]; |
| 83 | DEFINE_RWLOCK(raw_v4_lock); |
| 84 | |
| 85 | static void raw_v4_hash(struct sock *sk) |
| 86 | { |
| 87 | struct hlist_head *head = &raw_v4_htable[inet_sk(sk)->num & |
| 88 | (RAWV4_HTABLE_SIZE - 1)]; |
| 89 | |
| 90 | write_lock_bh(&raw_v4_lock); |
| 91 | sk_add_node(sk, head); |
| 92 | sock_prot_inc_use(sk->sk_prot); |
| 93 | write_unlock_bh(&raw_v4_lock); |
| 94 | } |
| 95 | |
| 96 | static void raw_v4_unhash(struct sock *sk) |
| 97 | { |
| 98 | write_lock_bh(&raw_v4_lock); |
| 99 | if (sk_del_node_init(sk)) |
| 100 | sock_prot_dec_use(sk->sk_prot); |
| 101 | write_unlock_bh(&raw_v4_lock); |
| 102 | } |
| 103 | |
| 104 | struct sock *__raw_v4_lookup(struct sock *sk, unsigned short num, |
Alexey Dobriyan | 6d74165 | 2006-06-05 21:06:41 -0700 | [diff] [blame] | 105 | __be32 raddr, __be32 laddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | int dif) |
| 107 | { |
| 108 | struct hlist_node *node; |
| 109 | |
| 110 | sk_for_each_from(sk, node) { |
| 111 | struct inet_sock *inet = inet_sk(sk); |
| 112 | |
| 113 | if (inet->num == num && |
| 114 | !(inet->daddr && inet->daddr != raddr) && |
| 115 | !(inet->rcv_saddr && inet->rcv_saddr != laddr) && |
| 116 | !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) |
| 117 | goto found; /* gotcha */ |
| 118 | } |
| 119 | sk = NULL; |
| 120 | found: |
| 121 | return sk; |
| 122 | } |
| 123 | |
| 124 | /* |
| 125 | * 0 - deliver |
| 126 | * 1 - block |
| 127 | */ |
| 128 | static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb) |
| 129 | { |
| 130 | int type; |
| 131 | |
| 132 | if (!pskb_may_pull(skb, sizeof(struct icmphdr))) |
| 133 | return 1; |
| 134 | |
| 135 | type = skb->h.icmph->type; |
| 136 | if (type < 32) { |
| 137 | __u32 data = raw_sk(sk)->filter.data; |
| 138 | |
| 139 | return ((1 << type) & data) != 0; |
| 140 | } |
| 141 | |
| 142 | /* Do not block unknown ICMP types */ |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | /* IP input processing comes here for RAW socket delivery. |
| 147 | * Caller owns SKB, so we must make clones. |
| 148 | * |
| 149 | * RFC 1122: SHOULD pass TOS value up to the transport layer. |
| 150 | * -> It does. And not only TOS, but all IP header. |
| 151 | */ |
Patrick McHardy | d13964f | 2005-08-09 19:45:02 -0700 | [diff] [blame] | 152 | int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | { |
| 154 | struct sock *sk; |
| 155 | struct hlist_head *head; |
Patrick McHardy | d13964f | 2005-08-09 19:45:02 -0700 | [diff] [blame] | 156 | int delivered = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
| 158 | read_lock(&raw_v4_lock); |
| 159 | head = &raw_v4_htable[hash]; |
| 160 | if (hlist_empty(head)) |
| 161 | goto out; |
| 162 | sk = __raw_v4_lookup(__sk_head(head), iph->protocol, |
| 163 | iph->saddr, iph->daddr, |
| 164 | skb->dev->ifindex); |
| 165 | |
| 166 | while (sk) { |
Patrick McHardy | d13964f | 2005-08-09 19:45:02 -0700 | [diff] [blame] | 167 | delivered = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) { |
| 169 | struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); |
| 170 | |
| 171 | /* Not releasing hash table! */ |
| 172 | if (clone) |
| 173 | raw_rcv(sk, clone); |
| 174 | } |
| 175 | sk = __raw_v4_lookup(sk_next(sk), iph->protocol, |
| 176 | iph->saddr, iph->daddr, |
| 177 | skb->dev->ifindex); |
| 178 | } |
| 179 | out: |
| 180 | read_unlock(&raw_v4_lock); |
Patrick McHardy | d13964f | 2005-08-09 19:45:02 -0700 | [diff] [blame] | 181 | return delivered; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | void raw_err (struct sock *sk, struct sk_buff *skb, u32 info) |
| 185 | { |
| 186 | struct inet_sock *inet = inet_sk(sk); |
| 187 | int type = skb->h.icmph->type; |
| 188 | int code = skb->h.icmph->code; |
| 189 | int err = 0; |
| 190 | int harderr = 0; |
| 191 | |
| 192 | /* Report error on raw socket, if: |
| 193 | 1. User requested ip_recverr. |
| 194 | 2. Socket is connected (otherwise the error indication |
| 195 | is useless without ip_recverr and error is hard. |
| 196 | */ |
| 197 | if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) |
| 198 | return; |
| 199 | |
| 200 | switch (type) { |
| 201 | default: |
| 202 | case ICMP_TIME_EXCEEDED: |
| 203 | err = EHOSTUNREACH; |
| 204 | break; |
| 205 | case ICMP_SOURCE_QUENCH: |
| 206 | return; |
| 207 | case ICMP_PARAMETERPROB: |
| 208 | err = EPROTO; |
| 209 | harderr = 1; |
| 210 | break; |
| 211 | case ICMP_DEST_UNREACH: |
| 212 | err = EHOSTUNREACH; |
| 213 | if (code > NR_ICMP_UNREACH) |
| 214 | break; |
| 215 | err = icmp_err_convert[code].errno; |
| 216 | harderr = icmp_err_convert[code].fatal; |
| 217 | if (code == ICMP_FRAG_NEEDED) { |
| 218 | harderr = inet->pmtudisc != IP_PMTUDISC_DONT; |
| 219 | err = EMSGSIZE; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | if (inet->recverr) { |
| 224 | struct iphdr *iph = (struct iphdr*)skb->data; |
| 225 | u8 *payload = skb->data + (iph->ihl << 2); |
| 226 | |
| 227 | if (inet->hdrincl) |
| 228 | payload = skb->data; |
| 229 | ip_icmp_error(sk, skb, err, 0, info, payload); |
| 230 | } |
| 231 | |
| 232 | if (inet->recverr || harderr) { |
| 233 | sk->sk_err = err; |
| 234 | sk->sk_error_report(sk); |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb) |
| 239 | { |
| 240 | /* Charge it to the socket. */ |
| 241 | |
| 242 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
| 243 | /* FIXME: increment a raw drops counter here */ |
| 244 | kfree_skb(skb); |
| 245 | return NET_RX_DROP; |
| 246 | } |
| 247 | |
| 248 | return NET_RX_SUCCESS; |
| 249 | } |
| 250 | |
| 251 | int raw_rcv(struct sock *sk, struct sk_buff *skb) |
| 252 | { |
| 253 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { |
| 254 | kfree_skb(skb); |
| 255 | return NET_RX_DROP; |
| 256 | } |
Patrick McHardy | b59c270 | 2006-01-06 23:06:10 -0800 | [diff] [blame] | 257 | nf_reset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
| 259 | skb_push(skb, skb->data - skb->nh.raw); |
| 260 | |
| 261 | raw_rcv_skb(sk, skb); |
| 262 | return 0; |
| 263 | } |
| 264 | |
Jesper Juhl | f7d7fc0 | 2005-06-18 23:00:34 -0700 | [diff] [blame] | 265 | static int raw_send_hdrinc(struct sock *sk, void *from, size_t length, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | struct rtable *rt, |
| 267 | unsigned int flags) |
| 268 | { |
| 269 | struct inet_sock *inet = inet_sk(sk); |
| 270 | int hh_len; |
| 271 | struct iphdr *iph; |
| 272 | struct sk_buff *skb; |
| 273 | int err; |
| 274 | |
| 275 | if (length > rt->u.dst.dev->mtu) { |
| 276 | ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->dport, |
| 277 | rt->u.dst.dev->mtu); |
| 278 | return -EMSGSIZE; |
| 279 | } |
| 280 | if (flags&MSG_PROBE) |
| 281 | goto out; |
| 282 | |
| 283 | hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); |
| 284 | |
| 285 | skb = sock_alloc_send_skb(sk, length+hh_len+15, |
| 286 | flags&MSG_DONTWAIT, &err); |
| 287 | if (skb == NULL) |
| 288 | goto error; |
| 289 | skb_reserve(skb, hh_len); |
| 290 | |
| 291 | skb->priority = sk->sk_priority; |
| 292 | skb->dst = dst_clone(&rt->u.dst); |
| 293 | |
| 294 | skb->nh.iph = iph = (struct iphdr *)skb_put(skb, length); |
| 295 | |
| 296 | skb->ip_summed = CHECKSUM_NONE; |
| 297 | |
| 298 | skb->h.raw = skb->nh.raw; |
| 299 | err = memcpy_fromiovecend((void *)iph, from, 0, length); |
| 300 | if (err) |
| 301 | goto error_fault; |
| 302 | |
| 303 | /* We don't modify invalid header */ |
Jesper Juhl | f7d7fc0 | 2005-06-18 23:00:34 -0700 | [diff] [blame] | 304 | if (length >= sizeof(*iph) && iph->ihl * 4U <= length) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | if (!iph->saddr) |
| 306 | iph->saddr = rt->rt_src; |
| 307 | iph->check = 0; |
| 308 | iph->tot_len = htons(length); |
| 309 | if (!iph->id) |
| 310 | ip_select_ident(iph, &rt->u.dst, NULL); |
| 311 | |
| 312 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
| 313 | } |
| 314 | |
| 315 | err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, |
| 316 | dst_output); |
| 317 | if (err > 0) |
| 318 | err = inet->recverr ? net_xmit_errno(err) : 0; |
| 319 | if (err) |
| 320 | goto error; |
| 321 | out: |
| 322 | return 0; |
| 323 | |
| 324 | error_fault: |
| 325 | err = -EFAULT; |
| 326 | kfree_skb(skb); |
| 327 | error: |
| 328 | IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS); |
| 329 | return err; |
| 330 | } |
| 331 | |
Heiko Carstens | a27b58f | 2006-10-30 15:06:12 -0800 | [diff] [blame] | 332 | static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | { |
| 334 | struct iovec *iov; |
| 335 | u8 __user *type = NULL; |
| 336 | u8 __user *code = NULL; |
| 337 | int probed = 0; |
Jesper Juhl | 93765d8 | 2005-06-18 23:00:15 -0700 | [diff] [blame] | 338 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | |
| 340 | if (!msg->msg_iov) |
Heiko Carstens | a27b58f | 2006-10-30 15:06:12 -0800 | [diff] [blame] | 341 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
| 343 | for (i = 0; i < msg->msg_iovlen; i++) { |
| 344 | iov = &msg->msg_iov[i]; |
| 345 | if (!iov) |
| 346 | continue; |
| 347 | |
| 348 | switch (fl->proto) { |
| 349 | case IPPROTO_ICMP: |
| 350 | /* check if one-byte field is readable or not. */ |
| 351 | if (iov->iov_base && iov->iov_len < 1) |
| 352 | break; |
| 353 | |
| 354 | if (!type) { |
| 355 | type = iov->iov_base; |
| 356 | /* check if code field is readable or not. */ |
| 357 | if (iov->iov_len > 1) |
| 358 | code = type + 1; |
| 359 | } else if (!code) |
| 360 | code = iov->iov_base; |
| 361 | |
| 362 | if (type && code) { |
Heiko Carstens | a27b58f | 2006-10-30 15:06:12 -0800 | [diff] [blame] | 363 | if (get_user(fl->fl_icmp_type, type) || |
| 364 | get_user(fl->fl_icmp_code, code)) |
| 365 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | probed = 1; |
| 367 | } |
| 368 | break; |
| 369 | default: |
| 370 | probed = 1; |
| 371 | break; |
| 372 | } |
| 373 | if (probed) |
| 374 | break; |
| 375 | } |
Heiko Carstens | a27b58f | 2006-10-30 15:06:12 -0800 | [diff] [blame] | 376 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | } |
| 378 | |
| 379 | static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| 380 | size_t len) |
| 381 | { |
| 382 | struct inet_sock *inet = inet_sk(sk); |
| 383 | struct ipcm_cookie ipc; |
| 384 | struct rtable *rt = NULL; |
| 385 | int free = 0; |
Al Viro | 3ca3c68 | 2006-09-27 18:28:07 -0700 | [diff] [blame] | 386 | __be32 daddr; |
Al Viro | c1d18f9 | 2006-09-27 18:28:28 -0700 | [diff] [blame] | 387 | __be32 saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | u8 tos; |
| 389 | int err; |
| 390 | |
| 391 | err = -EMSGSIZE; |
Jesper Juhl | 926d4b8 | 2005-06-18 23:00:00 -0700 | [diff] [blame] | 392 | if (len > 0xFFFF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | goto out; |
| 394 | |
| 395 | /* |
| 396 | * Check the flags. |
| 397 | */ |
| 398 | |
| 399 | err = -EOPNOTSUPP; |
| 400 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ |
| 401 | goto out; /* compatibility */ |
| 402 | |
| 403 | /* |
| 404 | * Get and verify the address. |
| 405 | */ |
| 406 | |
| 407 | if (msg->msg_namelen) { |
| 408 | struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name; |
| 409 | err = -EINVAL; |
| 410 | if (msg->msg_namelen < sizeof(*usin)) |
| 411 | goto out; |
| 412 | if (usin->sin_family != AF_INET) { |
| 413 | static int complained; |
| 414 | if (!complained++) |
| 415 | printk(KERN_INFO "%s forgot to set AF_INET in " |
| 416 | "raw sendmsg. Fix it!\n", |
| 417 | current->comm); |
| 418 | err = -EAFNOSUPPORT; |
| 419 | if (usin->sin_family) |
| 420 | goto out; |
| 421 | } |
| 422 | daddr = usin->sin_addr.s_addr; |
| 423 | /* ANK: I did not forget to get protocol from port field. |
| 424 | * I just do not know, who uses this weirdness. |
| 425 | * IP_HDRINCL is much more convenient. |
| 426 | */ |
| 427 | } else { |
| 428 | err = -EDESTADDRREQ; |
| 429 | if (sk->sk_state != TCP_ESTABLISHED) |
| 430 | goto out; |
| 431 | daddr = inet->daddr; |
| 432 | } |
| 433 | |
| 434 | ipc.addr = inet->saddr; |
| 435 | ipc.opt = NULL; |
| 436 | ipc.oif = sk->sk_bound_dev_if; |
| 437 | |
| 438 | if (msg->msg_controllen) { |
| 439 | err = ip_cmsg_send(msg, &ipc); |
| 440 | if (err) |
| 441 | goto out; |
| 442 | if (ipc.opt) |
| 443 | free = 1; |
| 444 | } |
| 445 | |
| 446 | saddr = ipc.addr; |
| 447 | ipc.addr = daddr; |
| 448 | |
| 449 | if (!ipc.opt) |
| 450 | ipc.opt = inet->opt; |
| 451 | |
| 452 | if (ipc.opt) { |
| 453 | err = -EINVAL; |
| 454 | /* Linux does not mangle headers on raw sockets, |
| 455 | * so that IP options + IP_HDRINCL is non-sense. |
| 456 | */ |
| 457 | if (inet->hdrincl) |
| 458 | goto done; |
| 459 | if (ipc.opt->srr) { |
| 460 | if (!daddr) |
| 461 | goto done; |
| 462 | daddr = ipc.opt->faddr; |
| 463 | } |
| 464 | } |
| 465 | tos = RT_CONN_FLAGS(sk); |
| 466 | if (msg->msg_flags & MSG_DONTROUTE) |
| 467 | tos |= RTO_ONLINK; |
| 468 | |
| 469 | if (MULTICAST(daddr)) { |
| 470 | if (!ipc.oif) |
| 471 | ipc.oif = inet->mc_index; |
| 472 | if (!saddr) |
| 473 | saddr = inet->mc_addr; |
| 474 | } |
| 475 | |
| 476 | { |
| 477 | struct flowi fl = { .oif = ipc.oif, |
| 478 | .nl_u = { .ip4_u = |
| 479 | { .daddr = daddr, |
| 480 | .saddr = saddr, |
| 481 | .tos = tos } }, |
| 482 | .proto = inet->hdrincl ? IPPROTO_RAW : |
| 483 | sk->sk_protocol, |
| 484 | }; |
Heiko Carstens | a27b58f | 2006-10-30 15:06:12 -0800 | [diff] [blame] | 485 | if (!inet->hdrincl) { |
| 486 | err = raw_probe_proto_opt(&fl, msg); |
| 487 | if (err) |
| 488 | goto done; |
| 489 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 491 | security_sk_classify_flow(sk, &fl); |
David S. Miller | 8eb9086 | 2007-02-08 02:09:21 -0800 | [diff] [blame^] | 492 | err = ip_route_output_flow(&rt, &fl, sk, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | } |
| 494 | if (err) |
| 495 | goto done; |
| 496 | |
| 497 | err = -EACCES; |
| 498 | if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) |
| 499 | goto done; |
| 500 | |
| 501 | if (msg->msg_flags & MSG_CONFIRM) |
| 502 | goto do_confirm; |
| 503 | back_from_confirm: |
| 504 | |
| 505 | if (inet->hdrincl) |
| 506 | err = raw_send_hdrinc(sk, msg->msg_iov, len, |
| 507 | rt, msg->msg_flags); |
| 508 | |
| 509 | else { |
| 510 | if (!ipc.addr) |
| 511 | ipc.addr = rt->rt_dst; |
| 512 | lock_sock(sk); |
| 513 | err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, |
| 514 | &ipc, rt, msg->msg_flags); |
| 515 | if (err) |
| 516 | ip_flush_pending_frames(sk); |
| 517 | else if (!(msg->msg_flags & MSG_MORE)) |
| 518 | err = ip_push_pending_frames(sk); |
| 519 | release_sock(sk); |
| 520 | } |
| 521 | done: |
| 522 | if (free) |
| 523 | kfree(ipc.opt); |
| 524 | ip_rt_put(rt); |
| 525 | |
Jesper Juhl | 5418c692 | 2005-06-18 22:59:45 -0700 | [diff] [blame] | 526 | out: |
| 527 | if (err < 0) |
| 528 | return err; |
| 529 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
| 531 | do_confirm: |
| 532 | dst_confirm(&rt->u.dst); |
| 533 | if (!(msg->msg_flags & MSG_PROBE) || len) |
| 534 | goto back_from_confirm; |
| 535 | err = 0; |
| 536 | goto done; |
| 537 | } |
| 538 | |
| 539 | static void raw_close(struct sock *sk, long timeout) |
| 540 | { |
| 541 | /* |
| 542 | * Raw sockets may have direct kernel refereneces. Kill them. |
| 543 | */ |
| 544 | ip_ra_control(sk, 0, NULL); |
| 545 | |
| 546 | sk_common_release(sk); |
| 547 | } |
| 548 | |
| 549 | /* This gets rid of all the nasties in af_inet. -DaveM */ |
| 550 | static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| 551 | { |
| 552 | struct inet_sock *inet = inet_sk(sk); |
| 553 | struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; |
| 554 | int ret = -EINVAL; |
| 555 | int chk_addr_ret; |
| 556 | |
| 557 | if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) |
| 558 | goto out; |
| 559 | chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr); |
| 560 | ret = -EADDRNOTAVAIL; |
| 561 | if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && |
| 562 | chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) |
| 563 | goto out; |
| 564 | inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; |
| 565 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) |
| 566 | inet->saddr = 0; /* Use device */ |
| 567 | sk_dst_reset(sk); |
| 568 | ret = 0; |
| 569 | out: return ret; |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * This should be easy, if there is something there |
| 574 | * we return it, otherwise we block. |
| 575 | */ |
| 576 | |
| 577 | static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| 578 | size_t len, int noblock, int flags, int *addr_len) |
| 579 | { |
| 580 | struct inet_sock *inet = inet_sk(sk); |
| 581 | size_t copied = 0; |
| 582 | int err = -EOPNOTSUPP; |
| 583 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; |
| 584 | struct sk_buff *skb; |
| 585 | |
| 586 | if (flags & MSG_OOB) |
| 587 | goto out; |
| 588 | |
| 589 | if (addr_len) |
| 590 | *addr_len = sizeof(*sin); |
| 591 | |
| 592 | if (flags & MSG_ERRQUEUE) { |
| 593 | err = ip_recv_error(sk, msg, len); |
| 594 | goto out; |
| 595 | } |
| 596 | |
| 597 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
| 598 | if (!skb) |
| 599 | goto out; |
| 600 | |
| 601 | copied = skb->len; |
| 602 | if (len < copied) { |
| 603 | msg->msg_flags |= MSG_TRUNC; |
| 604 | copied = len; |
| 605 | } |
| 606 | |
| 607 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| 608 | if (err) |
| 609 | goto done; |
| 610 | |
| 611 | sock_recv_timestamp(msg, sk, skb); |
| 612 | |
| 613 | /* Copy the address. */ |
| 614 | if (sin) { |
| 615 | sin->sin_family = AF_INET; |
| 616 | sin->sin_addr.s_addr = skb->nh.iph->saddr; |
Tetsuo Handa | f59fc7f | 2006-07-25 17:05:35 -0700 | [diff] [blame] | 617 | sin->sin_port = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| 619 | } |
| 620 | if (inet->cmsg_flags) |
| 621 | ip_cmsg_recv(msg, skb); |
| 622 | if (flags & MSG_TRUNC) |
| 623 | copied = skb->len; |
| 624 | done: |
| 625 | skb_free_datagram(sk, skb); |
Jesper Juhl | 5418c692 | 2005-06-18 22:59:45 -0700 | [diff] [blame] | 626 | out: |
| 627 | if (err) |
| 628 | return err; |
| 629 | return copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | } |
| 631 | |
| 632 | static int raw_init(struct sock *sk) |
| 633 | { |
| 634 | struct raw_sock *rp = raw_sk(sk); |
| 635 | |
| 636 | if (inet_sk(sk)->num == IPPROTO_ICMP) |
| 637 | memset(&rp->filter, 0, sizeof(rp->filter)); |
| 638 | return 0; |
| 639 | } |
| 640 | |
| 641 | static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) |
| 642 | { |
| 643 | if (optlen > sizeof(struct icmp_filter)) |
| 644 | optlen = sizeof(struct icmp_filter); |
| 645 | if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) |
| 646 | return -EFAULT; |
| 647 | return 0; |
| 648 | } |
| 649 | |
| 650 | static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) |
| 651 | { |
| 652 | int len, ret = -EFAULT; |
| 653 | |
| 654 | if (get_user(len, optlen)) |
| 655 | goto out; |
| 656 | ret = -EINVAL; |
| 657 | if (len < 0) |
| 658 | goto out; |
| 659 | if (len > sizeof(struct icmp_filter)) |
| 660 | len = sizeof(struct icmp_filter); |
| 661 | ret = -EFAULT; |
| 662 | if (put_user(len, optlen) || |
| 663 | copy_to_user(optval, &raw_sk(sk)->filter, len)) |
| 664 | goto out; |
| 665 | ret = 0; |
| 666 | out: return ret; |
| 667 | } |
| 668 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 669 | static int do_raw_setsockopt(struct sock *sk, int level, int optname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | char __user *optval, int optlen) |
| 671 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | if (optname == ICMP_FILTER) { |
| 673 | if (inet_sk(sk)->num != IPPROTO_ICMP) |
| 674 | return -EOPNOTSUPP; |
| 675 | else |
| 676 | return raw_seticmpfilter(sk, optval, optlen); |
| 677 | } |
| 678 | return -ENOPROTOOPT; |
| 679 | } |
| 680 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 681 | static int raw_setsockopt(struct sock *sk, int level, int optname, |
| 682 | char __user *optval, int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | { |
| 684 | if (level != SOL_RAW) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 685 | return ip_setsockopt(sk, level, optname, optval, optlen); |
| 686 | return do_raw_setsockopt(sk, level, optname, optval, optlen); |
| 687 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 689 | #ifdef CONFIG_COMPAT |
| 690 | static int compat_raw_setsockopt(struct sock *sk, int level, int optname, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 691 | char __user *optval, int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 692 | { |
| 693 | if (level != SOL_RAW) |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 694 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 695 | return do_raw_setsockopt(sk, level, optname, optval, optlen); |
| 696 | } |
| 697 | #endif |
| 698 | |
| 699 | static int do_raw_getsockopt(struct sock *sk, int level, int optname, |
| 700 | char __user *optval, int __user *optlen) |
| 701 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | if (optname == ICMP_FILTER) { |
| 703 | if (inet_sk(sk)->num != IPPROTO_ICMP) |
| 704 | return -EOPNOTSUPP; |
| 705 | else |
| 706 | return raw_geticmpfilter(sk, optval, optlen); |
| 707 | } |
| 708 | return -ENOPROTOOPT; |
| 709 | } |
| 710 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 711 | static int raw_getsockopt(struct sock *sk, int level, int optname, |
| 712 | char __user *optval, int __user *optlen) |
| 713 | { |
| 714 | if (level != SOL_RAW) |
| 715 | return ip_getsockopt(sk, level, optname, optval, optlen); |
| 716 | return do_raw_getsockopt(sk, level, optname, optval, optlen); |
| 717 | } |
| 718 | |
| 719 | #ifdef CONFIG_COMPAT |
| 720 | static int compat_raw_getsockopt(struct sock *sk, int level, int optname, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 721 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 722 | { |
| 723 | if (level != SOL_RAW) |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 724 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 725 | return do_raw_getsockopt(sk, level, optname, optval, optlen); |
| 726 | } |
| 727 | #endif |
| 728 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| 730 | { |
| 731 | switch (cmd) { |
| 732 | case SIOCOUTQ: { |
| 733 | int amount = atomic_read(&sk->sk_wmem_alloc); |
| 734 | return put_user(amount, (int __user *)arg); |
| 735 | } |
| 736 | case SIOCINQ: { |
| 737 | struct sk_buff *skb; |
| 738 | int amount = 0; |
| 739 | |
Herbert Xu | e0f9f85 | 2005-06-18 22:56:18 -0700 | [diff] [blame] | 740 | spin_lock_bh(&sk->sk_receive_queue.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | skb = skb_peek(&sk->sk_receive_queue); |
| 742 | if (skb != NULL) |
| 743 | amount = skb->len; |
Herbert Xu | e0f9f85 | 2005-06-18 22:56:18 -0700 | [diff] [blame] | 744 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | return put_user(amount, (int __user *)arg); |
| 746 | } |
| 747 | |
| 748 | default: |
| 749 | #ifdef CONFIG_IP_MROUTE |
| 750 | return ipmr_ioctl(sk, cmd, (void __user *)arg); |
| 751 | #else |
| 752 | return -ENOIOCTLCMD; |
| 753 | #endif |
| 754 | } |
| 755 | } |
| 756 | |
| 757 | struct proto raw_prot = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 758 | .name = "RAW", |
| 759 | .owner = THIS_MODULE, |
| 760 | .close = raw_close, |
| 761 | .connect = ip4_datagram_connect, |
| 762 | .disconnect = udp_disconnect, |
| 763 | .ioctl = raw_ioctl, |
| 764 | .init = raw_init, |
| 765 | .setsockopt = raw_setsockopt, |
| 766 | .getsockopt = raw_getsockopt, |
| 767 | .sendmsg = raw_sendmsg, |
| 768 | .recvmsg = raw_recvmsg, |
| 769 | .bind = raw_bind, |
| 770 | .backlog_rcv = raw_rcv_skb, |
| 771 | .hash = raw_v4_hash, |
| 772 | .unhash = raw_v4_unhash, |
| 773 | .obj_size = sizeof(struct raw_sock), |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 774 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 775 | .compat_setsockopt = compat_raw_setsockopt, |
| 776 | .compat_getsockopt = compat_raw_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 777 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | }; |
| 779 | |
| 780 | #ifdef CONFIG_PROC_FS |
| 781 | struct raw_iter_state { |
| 782 | int bucket; |
| 783 | }; |
| 784 | |
| 785 | #define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private) |
| 786 | |
| 787 | static struct sock *raw_get_first(struct seq_file *seq) |
| 788 | { |
| 789 | struct sock *sk; |
| 790 | struct raw_iter_state* state = raw_seq_private(seq); |
| 791 | |
| 792 | for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) { |
| 793 | struct hlist_node *node; |
| 794 | |
| 795 | sk_for_each(sk, node, &raw_v4_htable[state->bucket]) |
| 796 | if (sk->sk_family == PF_INET) |
| 797 | goto found; |
| 798 | } |
| 799 | sk = NULL; |
| 800 | found: |
| 801 | return sk; |
| 802 | } |
| 803 | |
| 804 | static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) |
| 805 | { |
| 806 | struct raw_iter_state* state = raw_seq_private(seq); |
| 807 | |
| 808 | do { |
| 809 | sk = sk_next(sk); |
| 810 | try_again: |
| 811 | ; |
| 812 | } while (sk && sk->sk_family != PF_INET); |
| 813 | |
| 814 | if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) { |
| 815 | sk = sk_head(&raw_v4_htable[state->bucket]); |
| 816 | goto try_again; |
| 817 | } |
| 818 | return sk; |
| 819 | } |
| 820 | |
| 821 | static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) |
| 822 | { |
| 823 | struct sock *sk = raw_get_first(seq); |
| 824 | |
| 825 | if (sk) |
| 826 | while (pos && (sk = raw_get_next(seq, sk)) != NULL) |
| 827 | --pos; |
| 828 | return pos ? NULL : sk; |
| 829 | } |
| 830 | |
| 831 | static void *raw_seq_start(struct seq_file *seq, loff_t *pos) |
| 832 | { |
| 833 | read_lock(&raw_v4_lock); |
| 834 | return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 835 | } |
| 836 | |
| 837 | static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 838 | { |
| 839 | struct sock *sk; |
| 840 | |
| 841 | if (v == SEQ_START_TOKEN) |
| 842 | sk = raw_get_first(seq); |
| 843 | else |
| 844 | sk = raw_get_next(seq, v); |
| 845 | ++*pos; |
| 846 | return sk; |
| 847 | } |
| 848 | |
| 849 | static void raw_seq_stop(struct seq_file *seq, void *v) |
| 850 | { |
| 851 | read_unlock(&raw_v4_lock); |
| 852 | } |
| 853 | |
| 854 | static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i) |
| 855 | { |
| 856 | struct inet_sock *inet = inet_sk(sp); |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 857 | __be32 dest = inet->daddr, |
| 858 | src = inet->rcv_saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | __u16 destp = 0, |
| 860 | srcp = inet->num; |
| 861 | |
| 862 | sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" |
| 863 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p", |
| 864 | i, src, srcp, dest, destp, sp->sk_state, |
| 865 | atomic_read(&sp->sk_wmem_alloc), |
| 866 | atomic_read(&sp->sk_rmem_alloc), |
| 867 | 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), |
| 868 | atomic_read(&sp->sk_refcnt), sp); |
| 869 | return tmpbuf; |
| 870 | } |
| 871 | |
| 872 | static int raw_seq_show(struct seq_file *seq, void *v) |
| 873 | { |
| 874 | char tmpbuf[129]; |
| 875 | |
| 876 | if (v == SEQ_START_TOKEN) |
| 877 | seq_printf(seq, "%-127s\n", |
| 878 | " sl local_address rem_address st tx_queue " |
| 879 | "rx_queue tr tm->when retrnsmt uid timeout " |
| 880 | "inode"); |
| 881 | else { |
| 882 | struct raw_iter_state *state = raw_seq_private(seq); |
| 883 | |
| 884 | seq_printf(seq, "%-127s\n", |
| 885 | get_raw_sock(v, tmpbuf, state->bucket)); |
| 886 | } |
| 887 | return 0; |
| 888 | } |
| 889 | |
| 890 | static struct seq_operations raw_seq_ops = { |
| 891 | .start = raw_seq_start, |
| 892 | .next = raw_seq_next, |
| 893 | .stop = raw_seq_stop, |
| 894 | .show = raw_seq_show, |
| 895 | }; |
| 896 | |
| 897 | static int raw_seq_open(struct inode *inode, struct file *file) |
| 898 | { |
| 899 | struct seq_file *seq; |
| 900 | int rc = -ENOMEM; |
| 901 | struct raw_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 902 | |
| 903 | if (!s) |
| 904 | goto out; |
| 905 | rc = seq_open(file, &raw_seq_ops); |
| 906 | if (rc) |
| 907 | goto out_kfree; |
| 908 | |
| 909 | seq = file->private_data; |
| 910 | seq->private = s; |
| 911 | memset(s, 0, sizeof(*s)); |
| 912 | out: |
| 913 | return rc; |
| 914 | out_kfree: |
| 915 | kfree(s); |
| 916 | goto out; |
| 917 | } |
| 918 | |
| 919 | static struct file_operations raw_seq_fops = { |
| 920 | .owner = THIS_MODULE, |
| 921 | .open = raw_seq_open, |
| 922 | .read = seq_read, |
| 923 | .llseek = seq_lseek, |
| 924 | .release = seq_release_private, |
| 925 | }; |
| 926 | |
| 927 | int __init raw_proc_init(void) |
| 928 | { |
| 929 | if (!proc_net_fops_create("raw", S_IRUGO, &raw_seq_fops)) |
| 930 | return -ENOMEM; |
| 931 | return 0; |
| 932 | } |
| 933 | |
| 934 | void __init raw_proc_exit(void) |
| 935 | { |
| 936 | proc_net_remove("raw"); |
| 937 | } |
| 938 | #endif /* CONFIG_PROC_FS */ |