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/types.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/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>
57 #include <linux/mroute.h>
58 #include <linux/netdevice.h>
59 #include <linux/in_route.h>
60 #include <linux/route.h>
61 #include <linux/skbuff.h>
64 #include <linux/gfp.h>
66 #include <linux/net.h>
72 #include <net/tcp_states.h>
73 #include <net/inet_common.h>
74 #include <net/checksum.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>
82 struct hlist_head raw_v4_htable[RAWV4_HTABLE_SIZE];
83 DEFINE_RWLOCK(raw_v4_lock);
85 static void raw_v4_hash(struct sock *sk)
87 struct hlist_head *head = &raw_v4_htable[inet_sk(sk)->num &
88 (RAWV4_HTABLE_SIZE - 1)];
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);
96 static void raw_v4_unhash(struct sock *sk)
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);
104 struct sock *__raw_v4_lookup(struct sock *sk, unsigned short num,
105 __be32 raddr, __be32 laddr,
108 struct hlist_node *node;
110 sk_for_each_from(sk, node) {
111 struct inet_sock *inet = inet_sk(sk);
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 */
128 static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
132 if (!pskb_may_pull(skb, sizeof(struct icmphdr)))
135 type = icmp_hdr(skb)->type;
137 __u32 data = raw_sk(sk)->filter.data;
139 return ((1 << type) & data) != 0;
142 /* Do not block unknown ICMP types */
146 /* IP input processing comes here for RAW socket delivery.
147 * Caller owns SKB, so we must make clones.
149 * RFC 1122: SHOULD pass TOS value up to the transport layer.
150 * -> It does. And not only TOS, but all IP header.
152 int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
155 struct hlist_head *head;
158 read_lock(&raw_v4_lock);
159 head = &raw_v4_htable[hash];
160 if (hlist_empty(head))
162 sk = __raw_v4_lookup(__sk_head(head), iph->protocol,
163 iph->saddr, iph->daddr,
168 if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
169 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
171 /* Not releasing hash table! */
175 sk = __raw_v4_lookup(sk_next(sk), iph->protocol,
176 iph->saddr, iph->daddr,
180 read_unlock(&raw_v4_lock);
184 void raw_err (struct sock *sk, struct sk_buff *skb, u32 info)
186 struct inet_sock *inet = inet_sk(sk);
187 const int type = icmp_hdr(skb)->type;
188 const int code = icmp_hdr(skb)->code;
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.
197 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
202 case ICMP_TIME_EXCEEDED:
205 case ICMP_SOURCE_QUENCH:
207 case ICMP_PARAMETERPROB:
211 case ICMP_DEST_UNREACH:
213 if (code > NR_ICMP_UNREACH)
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;
224 struct iphdr *iph = (struct iphdr*)skb->data;
225 u8 *payload = skb->data + (iph->ihl << 2);
229 ip_icmp_error(sk, skb, err, 0, info, payload);
232 if (inet->recverr || harderr) {
234 sk->sk_error_report(sk);
238 static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb)
240 /* Charge it to the socket. */
242 if (sock_queue_rcv_skb(sk, skb) < 0) {
243 /* FIXME: increment a raw drops counter here */
248 return NET_RX_SUCCESS;
251 int raw_rcv(struct sock *sk, struct sk_buff *skb)
253 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
259 skb_push(skb, skb->data - skb_network_header(skb));
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_reset_network_header(skb);
296 skb_put(skb, length);
298 skb->ip_summed = CHECKSUM_NONE;
300 skb->transport_header = skb->network_header;
301 err = memcpy_fromiovecend((void *)iph, from, 0, length);
305 /* We don't modify invalid header */
306 if (length >= sizeof(*iph) && iph->ihl * 4U <= length) {
308 iph->saddr = rt->rt_src;
310 iph->tot_len = htons(length);
312 ip_select_ident(iph, &rt->u.dst, NULL);
314 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
317 err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
320 err = inet->recverr ? net_xmit_errno(err) : 0;
330 IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
334 static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
337 u8 __user *type = NULL;
338 u8 __user *code = NULL;
345 for (i = 0; i < msg->msg_iovlen; i++) {
346 iov = &msg->msg_iov[i];
352 /* check if one-byte field is readable or not. */
353 if (iov->iov_base && iov->iov_len < 1)
357 type = iov->iov_base;
358 /* check if code field is readable or not. */
359 if (iov->iov_len > 1)
362 code = iov->iov_base;
365 if (get_user(fl->fl_icmp_type, type) ||
366 get_user(fl->fl_icmp_code, code))
381 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
384 struct inet_sock *inet = inet_sk(sk);
385 struct ipcm_cookie ipc;
386 struct rtable *rt = NULL;
402 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
403 goto out; /* compatibility */
406 * Get and verify the address.
409 if (msg->msg_namelen) {
410 struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name;
412 if (msg->msg_namelen < sizeof(*usin))
414 if (usin->sin_family != AF_INET) {
415 static int complained;
417 printk(KERN_INFO "%s forgot to set AF_INET in "
418 "raw sendmsg. Fix it!\n",
421 if (usin->sin_family)
424 daddr = usin->sin_addr.s_addr;
425 /* ANK: I did not forget to get protocol from port field.
426 * I just do not know, who uses this weirdness.
427 * IP_HDRINCL is much more convenient.
431 if (sk->sk_state != TCP_ESTABLISHED)
436 ipc.addr = inet->saddr;
438 ipc.oif = sk->sk_bound_dev_if;
440 if (msg->msg_controllen) {
441 err = ip_cmsg_send(msg, &ipc);
456 /* Linux does not mangle headers on raw sockets,
457 * so that IP options + IP_HDRINCL is non-sense.
464 daddr = ipc.opt->faddr;
467 tos = RT_CONN_FLAGS(sk);
468 if (msg->msg_flags & MSG_DONTROUTE)
471 if (MULTICAST(daddr)) {
473 ipc.oif = inet->mc_index;
475 saddr = inet->mc_addr;
479 struct flowi fl = { .oif = ipc.oif,
484 .proto = inet->hdrincl ? IPPROTO_RAW :
487 if (!inet->hdrincl) {
488 err = raw_probe_proto_opt(&fl, msg);
493 security_sk_classify_flow(sk, &fl);
494 err = ip_route_output_flow(&rt, &fl, sk, 1);
500 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
503 if (msg->msg_flags & MSG_CONFIRM)
508 err = raw_send_hdrinc(sk, msg->msg_iov, len,
513 ipc.addr = rt->rt_dst;
515 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
516 &ipc, rt, msg->msg_flags);
518 ip_flush_pending_frames(sk);
519 else if (!(msg->msg_flags & MSG_MORE))
520 err = ip_push_pending_frames(sk);
534 dst_confirm(&rt->u.dst);
535 if (!(msg->msg_flags & MSG_PROBE) || len)
536 goto back_from_confirm;
541 static void raw_close(struct sock *sk, long timeout)
544 * Raw sockets may have direct kernel refereneces. Kill them.
546 ip_ra_control(sk, 0, NULL);
548 sk_common_release(sk);
551 /* This gets rid of all the nasties in af_inet. -DaveM */
552 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
554 struct inet_sock *inet = inet_sk(sk);
555 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
559 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
561 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
562 ret = -EADDRNOTAVAIL;
563 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
564 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
566 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
567 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
568 inet->saddr = 0; /* Use device */
575 * This should be easy, if there is something there
576 * we return it, otherwise we block.
579 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
580 size_t len, int noblock, int flags, int *addr_len)
582 struct inet_sock *inet = inet_sk(sk);
584 int err = -EOPNOTSUPP;
585 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
592 *addr_len = sizeof(*sin);
594 if (flags & MSG_ERRQUEUE) {
595 err = ip_recv_error(sk, msg, len);
599 skb = skb_recv_datagram(sk, flags, noblock, &err);
605 msg->msg_flags |= MSG_TRUNC;
609 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
613 sock_recv_timestamp(msg, sk, skb);
615 /* Copy the address. */
617 sin->sin_family = AF_INET;
618 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
620 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
622 if (inet->cmsg_flags)
623 ip_cmsg_recv(msg, skb);
624 if (flags & MSG_TRUNC)
627 skb_free_datagram(sk, skb);
634 static int raw_init(struct sock *sk)
636 struct raw_sock *rp = raw_sk(sk);
638 if (inet_sk(sk)->num == IPPROTO_ICMP)
639 memset(&rp->filter, 0, sizeof(rp->filter));
643 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
645 if (optlen > sizeof(struct icmp_filter))
646 optlen = sizeof(struct icmp_filter);
647 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
652 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
654 int len, ret = -EFAULT;
656 if (get_user(len, optlen))
661 if (len > sizeof(struct icmp_filter))
662 len = sizeof(struct icmp_filter);
664 if (put_user(len, optlen) ||
665 copy_to_user(optval, &raw_sk(sk)->filter, len))
671 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
672 char __user *optval, int optlen)
674 if (optname == ICMP_FILTER) {
675 if (inet_sk(sk)->num != IPPROTO_ICMP)
678 return raw_seticmpfilter(sk, optval, optlen);
683 static int raw_setsockopt(struct sock *sk, int level, int optname,
684 char __user *optval, int optlen)
686 if (level != SOL_RAW)
687 return ip_setsockopt(sk, level, optname, optval, optlen);
688 return do_raw_setsockopt(sk, level, optname, optval, optlen);
692 static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
693 char __user *optval, int optlen)
695 if (level != SOL_RAW)
696 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
697 return do_raw_setsockopt(sk, level, optname, optval, optlen);
701 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
702 char __user *optval, int __user *optlen)
704 if (optname == ICMP_FILTER) {
705 if (inet_sk(sk)->num != IPPROTO_ICMP)
708 return raw_geticmpfilter(sk, optval, optlen);
713 static int raw_getsockopt(struct sock *sk, int level, int optname,
714 char __user *optval, int __user *optlen)
716 if (level != SOL_RAW)
717 return ip_getsockopt(sk, level, optname, optval, optlen);
718 return do_raw_getsockopt(sk, level, optname, optval, optlen);
722 static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
723 char __user *optval, int __user *optlen)
725 if (level != SOL_RAW)
726 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
727 return do_raw_getsockopt(sk, level, optname, optval, optlen);
731 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
735 int amount = atomic_read(&sk->sk_wmem_alloc);
736 return put_user(amount, (int __user *)arg);
742 spin_lock_bh(&sk->sk_receive_queue.lock);
743 skb = skb_peek(&sk->sk_receive_queue);
746 spin_unlock_bh(&sk->sk_receive_queue.lock);
747 return put_user(amount, (int __user *)arg);
751 #ifdef CONFIG_IP_MROUTE
752 return ipmr_ioctl(sk, cmd, (void __user *)arg);
759 struct proto raw_prot = {
761 .owner = THIS_MODULE,
763 .connect = ip4_datagram_connect,
764 .disconnect = udp_disconnect,
767 .setsockopt = raw_setsockopt,
768 .getsockopt = raw_getsockopt,
769 .sendmsg = raw_sendmsg,
770 .recvmsg = raw_recvmsg,
772 .backlog_rcv = raw_rcv_skb,
774 .unhash = raw_v4_unhash,
775 .obj_size = sizeof(struct raw_sock),
777 .compat_setsockopt = compat_raw_setsockopt,
778 .compat_getsockopt = compat_raw_getsockopt,
782 #ifdef CONFIG_PROC_FS
783 struct raw_iter_state {
787 #define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private)
789 static struct sock *raw_get_first(struct seq_file *seq)
792 struct raw_iter_state* state = raw_seq_private(seq);
794 for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) {
795 struct hlist_node *node;
797 sk_for_each(sk, node, &raw_v4_htable[state->bucket])
798 if (sk->sk_family == PF_INET)
806 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
808 struct raw_iter_state* state = raw_seq_private(seq);
814 } while (sk && sk->sk_family != PF_INET);
816 if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) {
817 sk = sk_head(&raw_v4_htable[state->bucket]);
823 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
825 struct sock *sk = raw_get_first(seq);
828 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
830 return pos ? NULL : sk;
833 static void *raw_seq_start(struct seq_file *seq, loff_t *pos)
835 read_lock(&raw_v4_lock);
836 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
839 static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
843 if (v == SEQ_START_TOKEN)
844 sk = raw_get_first(seq);
846 sk = raw_get_next(seq, v);
851 static void raw_seq_stop(struct seq_file *seq, void *v)
853 read_unlock(&raw_v4_lock);
856 static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i)
858 struct inet_sock *inet = inet_sk(sp);
859 __be32 dest = inet->daddr,
860 src = inet->rcv_saddr;
864 sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
865 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
866 i, src, srcp, dest, destp, sp->sk_state,
867 atomic_read(&sp->sk_wmem_alloc),
868 atomic_read(&sp->sk_rmem_alloc),
869 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
870 atomic_read(&sp->sk_refcnt), sp);
874 static int raw_seq_show(struct seq_file *seq, void *v)
878 if (v == SEQ_START_TOKEN)
879 seq_printf(seq, "%-127s\n",
880 " sl local_address rem_address st tx_queue "
881 "rx_queue tr tm->when retrnsmt uid timeout "
884 struct raw_iter_state *state = raw_seq_private(seq);
886 seq_printf(seq, "%-127s\n",
887 get_raw_sock(v, tmpbuf, state->bucket));
892 static const struct seq_operations raw_seq_ops = {
893 .start = raw_seq_start,
894 .next = raw_seq_next,
895 .stop = raw_seq_stop,
896 .show = raw_seq_show,
899 static int raw_seq_open(struct inode *inode, struct file *file)
901 struct seq_file *seq;
903 struct raw_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
907 rc = seq_open(file, &raw_seq_ops);
911 seq = file->private_data;
913 memset(s, 0, sizeof(*s));
921 static const struct file_operations raw_seq_fops = {
922 .owner = THIS_MODULE,
923 .open = raw_seq_open,
926 .release = seq_release_private,
929 int __init raw_proc_init(void)
931 if (!proc_net_fops_create("raw", S_IRUGO, &raw_seq_fops))
936 void __init raw_proc_exit(void)
938 proc_net_remove("raw");
940 #endif /* CONFIG_PROC_FS */