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.
6 * RAW - implementation of IP "raw" sockets.
8 * Version: $Id: raw.c,v 1.64 2002/02/01 22:01:04 davem Exp $
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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,
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.
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.
42 #include <linux/config.h>
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>
48 #include <linux/types.h>
49 #include <linux/stddef.h>
50 #include <linux/slab.h>
51 #include <linux/errno.h>
52 #include <linux/aio.h>
53 #include <linux/kernel.h>
54 #include <linux/spinlock.h>
55 #include <linux/sockios.h>
56 #include <linux/socket.h>
58 #include <linux/mroute.h>
59 #include <linux/netdevice.h>
60 #include <linux/in_route.h>
61 #include <linux/route.h>
62 #include <linux/skbuff.h>
65 #include <linux/gfp.h>
67 #include <linux/net.h>
73 #include <net/tcp_states.h>
74 #include <net/inet_common.h>
75 #include <net/checksum.h>
77 #include <linux/rtnetlink.h>
78 #include <linux/proc_fs.h>
79 #include <linux/seq_file.h>
80 #include <linux/netfilter.h>
81 #include <linux/netfilter_ipv4.h>
83 struct hlist_head raw_v4_htable[RAWV4_HTABLE_SIZE];
84 DEFINE_RWLOCK(raw_v4_lock);
86 static void raw_v4_hash(struct sock *sk)
88 struct hlist_head *head = &raw_v4_htable[inet_sk(sk)->num &
89 (RAWV4_HTABLE_SIZE - 1)];
91 write_lock_bh(&raw_v4_lock);
92 sk_add_node(sk, head);
93 sock_prot_inc_use(sk->sk_prot);
94 write_unlock_bh(&raw_v4_lock);
97 static void raw_v4_unhash(struct sock *sk)
99 write_lock_bh(&raw_v4_lock);
100 if (sk_del_node_init(sk))
101 sock_prot_dec_use(sk->sk_prot);
102 write_unlock_bh(&raw_v4_lock);
105 struct sock *__raw_v4_lookup(struct sock *sk, unsigned short num,
106 unsigned long raddr, unsigned long laddr,
109 struct hlist_node *node;
111 sk_for_each_from(sk, node) {
112 struct inet_sock *inet = inet_sk(sk);
114 if (inet->num == num &&
115 !(inet->daddr && inet->daddr != raddr) &&
116 !(inet->rcv_saddr && inet->rcv_saddr != laddr) &&
117 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
118 goto found; /* gotcha */
129 static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
133 if (!pskb_may_pull(skb, sizeof(struct icmphdr)))
136 type = skb->h.icmph->type;
138 __u32 data = raw_sk(sk)->filter.data;
140 return ((1 << type) & data) != 0;
143 /* Do not block unknown ICMP types */
147 /* IP input processing comes here for RAW socket delivery.
148 * Caller owns SKB, so we must make clones.
150 * RFC 1122: SHOULD pass TOS value up to the transport layer.
151 * -> It does. And not only TOS, but all IP header.
153 int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
156 struct hlist_head *head;
159 read_lock(&raw_v4_lock);
160 head = &raw_v4_htable[hash];
161 if (hlist_empty(head))
163 sk = __raw_v4_lookup(__sk_head(head), iph->protocol,
164 iph->saddr, iph->daddr,
169 if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
170 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
172 /* Not releasing hash table! */
176 sk = __raw_v4_lookup(sk_next(sk), iph->protocol,
177 iph->saddr, iph->daddr,
181 read_unlock(&raw_v4_lock);
185 void raw_err (struct sock *sk, struct sk_buff *skb, u32 info)
187 struct inet_sock *inet = inet_sk(sk);
188 int type = skb->h.icmph->type;
189 int code = skb->h.icmph->code;
193 /* Report error on raw socket, if:
194 1. User requested ip_recverr.
195 2. Socket is connected (otherwise the error indication
196 is useless without ip_recverr and error is hard.
198 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
203 case ICMP_TIME_EXCEEDED:
206 case ICMP_SOURCE_QUENCH:
208 case ICMP_PARAMETERPROB:
212 case ICMP_DEST_UNREACH:
214 if (code > NR_ICMP_UNREACH)
216 err = icmp_err_convert[code].errno;
217 harderr = icmp_err_convert[code].fatal;
218 if (code == ICMP_FRAG_NEEDED) {
219 harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
225 struct iphdr *iph = (struct iphdr*)skb->data;
226 u8 *payload = skb->data + (iph->ihl << 2);
230 ip_icmp_error(sk, skb, err, 0, info, payload);
233 if (inet->recverr || harderr) {
235 sk->sk_error_report(sk);
239 static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb)
241 /* Charge it to the socket. */
243 if (sock_queue_rcv_skb(sk, skb) < 0) {
244 /* FIXME: increment a raw drops counter here */
249 return NET_RX_SUCCESS;
252 int raw_rcv(struct sock *sk, struct sk_buff *skb)
254 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
259 skb_push(skb, skb->data - skb->nh.raw);
261 raw_rcv_skb(sk, skb);
265 static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
269 struct inet_sock *inet = inet_sk(sk);
275 if (length > rt->u.dst.dev->mtu) {
276 ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->dport,
283 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
285 skb = sock_alloc_send_skb(sk, length+hh_len+15,
286 flags&MSG_DONTWAIT, &err);
289 skb_reserve(skb, hh_len);
291 skb->priority = sk->sk_priority;
292 skb->dst = dst_clone(&rt->u.dst);
294 skb->nh.iph = iph = (struct iphdr *)skb_put(skb, length);
296 skb->ip_summed = CHECKSUM_NONE;
298 skb->h.raw = skb->nh.raw;
299 err = memcpy_fromiovecend((void *)iph, from, 0, length);
303 /* We don't modify invalid header */
304 if (length >= sizeof(*iph) && iph->ihl * 4U <= length) {
306 iph->saddr = rt->rt_src;
308 iph->tot_len = htons(length);
310 ip_select_ident(iph, &rt->u.dst, NULL);
312 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
315 err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
318 err = inet->recverr ? net_xmit_errno(err) : 0;
328 IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
332 static void raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
335 u8 __user *type = NULL;
336 u8 __user *code = NULL;
343 for (i = 0; i < msg->msg_iovlen; i++) {
344 iov = &msg->msg_iov[i];
350 /* check if one-byte field is readable or not. */
351 if (iov->iov_base && iov->iov_len < 1)
355 type = iov->iov_base;
356 /* check if code field is readable or not. */
357 if (iov->iov_len > 1)
360 code = iov->iov_base;
363 get_user(fl->fl_icmp_type, type);
364 get_user(fl->fl_icmp_code, code);
377 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
380 struct inet_sock *inet = inet_sk(sk);
381 struct ipcm_cookie ipc;
382 struct rtable *rt = NULL;
398 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
399 goto out; /* compatibility */
402 * Get and verify the address.
405 if (msg->msg_namelen) {
406 struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name;
408 if (msg->msg_namelen < sizeof(*usin))
410 if (usin->sin_family != AF_INET) {
411 static int complained;
413 printk(KERN_INFO "%s forgot to set AF_INET in "
414 "raw sendmsg. Fix it!\n",
417 if (usin->sin_family)
420 daddr = usin->sin_addr.s_addr;
421 /* ANK: I did not forget to get protocol from port field.
422 * I just do not know, who uses this weirdness.
423 * IP_HDRINCL is much more convenient.
427 if (sk->sk_state != TCP_ESTABLISHED)
432 ipc.addr = inet->saddr;
434 ipc.oif = sk->sk_bound_dev_if;
436 if (msg->msg_controllen) {
437 err = ip_cmsg_send(msg, &ipc);
452 /* Linux does not mangle headers on raw sockets,
453 * so that IP options + IP_HDRINCL is non-sense.
460 daddr = ipc.opt->faddr;
463 tos = RT_CONN_FLAGS(sk);
464 if (msg->msg_flags & MSG_DONTROUTE)
467 if (MULTICAST(daddr)) {
469 ipc.oif = inet->mc_index;
471 saddr = inet->mc_addr;
475 struct flowi fl = { .oif = ipc.oif,
480 .proto = inet->hdrincl ? IPPROTO_RAW :
484 raw_probe_proto_opt(&fl, msg);
486 err = ip_route_output_flow(&rt, &fl, sk, !(msg->msg_flags&MSG_DONTWAIT));
492 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
495 if (msg->msg_flags & MSG_CONFIRM)
500 err = raw_send_hdrinc(sk, msg->msg_iov, len,
505 ipc.addr = rt->rt_dst;
507 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
508 &ipc, rt, msg->msg_flags);
510 ip_flush_pending_frames(sk);
511 else if (!(msg->msg_flags & MSG_MORE))
512 err = ip_push_pending_frames(sk);
526 dst_confirm(&rt->u.dst);
527 if (!(msg->msg_flags & MSG_PROBE) || len)
528 goto back_from_confirm;
533 static void raw_close(struct sock *sk, long timeout)
536 * Raw sockets may have direct kernel refereneces. Kill them.
538 ip_ra_control(sk, 0, NULL);
540 sk_common_release(sk);
543 /* This gets rid of all the nasties in af_inet. -DaveM */
544 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
546 struct inet_sock *inet = inet_sk(sk);
547 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
551 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
553 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
554 ret = -EADDRNOTAVAIL;
555 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
556 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
558 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
559 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
560 inet->saddr = 0; /* Use device */
567 * This should be easy, if there is something there
568 * we return it, otherwise we block.
571 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
572 size_t len, int noblock, int flags, int *addr_len)
574 struct inet_sock *inet = inet_sk(sk);
576 int err = -EOPNOTSUPP;
577 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
584 *addr_len = sizeof(*sin);
586 if (flags & MSG_ERRQUEUE) {
587 err = ip_recv_error(sk, msg, len);
591 skb = skb_recv_datagram(sk, flags, noblock, &err);
597 msg->msg_flags |= MSG_TRUNC;
601 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
605 sock_recv_timestamp(msg, sk, skb);
607 /* Copy the address. */
609 sin->sin_family = AF_INET;
610 sin->sin_addr.s_addr = skb->nh.iph->saddr;
611 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
613 if (inet->cmsg_flags)
614 ip_cmsg_recv(msg, skb);
615 if (flags & MSG_TRUNC)
618 skb_free_datagram(sk, skb);
625 static int raw_init(struct sock *sk)
627 struct raw_sock *rp = raw_sk(sk);
629 if (inet_sk(sk)->num == IPPROTO_ICMP)
630 memset(&rp->filter, 0, sizeof(rp->filter));
634 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
636 if (optlen > sizeof(struct icmp_filter))
637 optlen = sizeof(struct icmp_filter);
638 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
643 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
645 int len, ret = -EFAULT;
647 if (get_user(len, optlen))
652 if (len > sizeof(struct icmp_filter))
653 len = sizeof(struct icmp_filter);
655 if (put_user(len, optlen) ||
656 copy_to_user(optval, &raw_sk(sk)->filter, len))
662 static int raw_setsockopt(struct sock *sk, int level, int optname,
663 char __user *optval, int optlen)
665 if (level != SOL_RAW)
666 return ip_setsockopt(sk, level, optname, optval, optlen);
668 if (optname == ICMP_FILTER) {
669 if (inet_sk(sk)->num != IPPROTO_ICMP)
672 return raw_seticmpfilter(sk, optval, optlen);
677 static int raw_getsockopt(struct sock *sk, int level, int optname,
678 char __user *optval, int __user *optlen)
680 if (level != SOL_RAW)
681 return ip_getsockopt(sk, level, optname, optval, optlen);
683 if (optname == ICMP_FILTER) {
684 if (inet_sk(sk)->num != IPPROTO_ICMP)
687 return raw_geticmpfilter(sk, optval, optlen);
692 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
696 int amount = atomic_read(&sk->sk_wmem_alloc);
697 return put_user(amount, (int __user *)arg);
703 spin_lock_bh(&sk->sk_receive_queue.lock);
704 skb = skb_peek(&sk->sk_receive_queue);
707 spin_unlock_bh(&sk->sk_receive_queue.lock);
708 return put_user(amount, (int __user *)arg);
712 #ifdef CONFIG_IP_MROUTE
713 return ipmr_ioctl(sk, cmd, (void __user *)arg);
720 struct proto raw_prot = {
722 .owner = THIS_MODULE,
724 .connect = ip4_datagram_connect,
725 .disconnect = udp_disconnect,
728 .setsockopt = raw_setsockopt,
729 .getsockopt = raw_getsockopt,
730 .sendmsg = raw_sendmsg,
731 .recvmsg = raw_recvmsg,
733 .backlog_rcv = raw_rcv_skb,
735 .unhash = raw_v4_unhash,
736 .obj_size = sizeof(struct raw_sock),
739 #ifdef CONFIG_PROC_FS
740 struct raw_iter_state {
744 #define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private)
746 static struct sock *raw_get_first(struct seq_file *seq)
749 struct raw_iter_state* state = raw_seq_private(seq);
751 for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) {
752 struct hlist_node *node;
754 sk_for_each(sk, node, &raw_v4_htable[state->bucket])
755 if (sk->sk_family == PF_INET)
763 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
765 struct raw_iter_state* state = raw_seq_private(seq);
771 } while (sk && sk->sk_family != PF_INET);
773 if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) {
774 sk = sk_head(&raw_v4_htable[state->bucket]);
780 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
782 struct sock *sk = raw_get_first(seq);
785 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
787 return pos ? NULL : sk;
790 static void *raw_seq_start(struct seq_file *seq, loff_t *pos)
792 read_lock(&raw_v4_lock);
793 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
796 static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
800 if (v == SEQ_START_TOKEN)
801 sk = raw_get_first(seq);
803 sk = raw_get_next(seq, v);
808 static void raw_seq_stop(struct seq_file *seq, void *v)
810 read_unlock(&raw_v4_lock);
813 static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i)
815 struct inet_sock *inet = inet_sk(sp);
816 unsigned int dest = inet->daddr,
817 src = inet->rcv_saddr;
821 sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
822 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
823 i, src, srcp, dest, destp, sp->sk_state,
824 atomic_read(&sp->sk_wmem_alloc),
825 atomic_read(&sp->sk_rmem_alloc),
826 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
827 atomic_read(&sp->sk_refcnt), sp);
831 static int raw_seq_show(struct seq_file *seq, void *v)
835 if (v == SEQ_START_TOKEN)
836 seq_printf(seq, "%-127s\n",
837 " sl local_address rem_address st tx_queue "
838 "rx_queue tr tm->when retrnsmt uid timeout "
841 struct raw_iter_state *state = raw_seq_private(seq);
843 seq_printf(seq, "%-127s\n",
844 get_raw_sock(v, tmpbuf, state->bucket));
849 static struct seq_operations raw_seq_ops = {
850 .start = raw_seq_start,
851 .next = raw_seq_next,
852 .stop = raw_seq_stop,
853 .show = raw_seq_show,
856 static int raw_seq_open(struct inode *inode, struct file *file)
858 struct seq_file *seq;
860 struct raw_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
864 rc = seq_open(file, &raw_seq_ops);
868 seq = file->private_data;
870 memset(s, 0, sizeof(*s));
878 static struct file_operations raw_seq_fops = {
879 .owner = THIS_MODULE,
880 .open = raw_seq_open,
883 .release = seq_release_private,
886 int __init raw_proc_init(void)
888 if (!proc_net_fops_create("raw", S_IRUGO, &raw_seq_fops))
893 void __init raw_proc_exit(void)
895 proc_net_remove("raw");
897 #endif /* CONFIG_PROC_FS */