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Merge remote-tracking branches 'asoc/topic/es8328', 'asoc/topic/find-dai', 'asoc...
[deliverable/linux.git] / net / ipv4 / raw.c
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 * Authors: Ross Biro
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 *
11 * Fixes:
12 * Alan Cox : verify_area() fixed up
13 * Alan Cox : ICMP error handling
14 * Alan Cox : EMSGSIZE if you send too big a packet
15 * Alan Cox : Now uses generic datagrams and shared
16 * skbuff library. No more peek crashes,
17 * no more backlogs
18 * Alan Cox : Checks sk->broadcast.
19 * Alan Cox : Uses skb_free_datagram/skb_copy_datagram
20 * Alan Cox : Raw passes ip options too
21 * Alan Cox : Setsocketopt added
22 * Alan Cox : Fixed error return for broadcasts
23 * Alan Cox : Removed wake_up calls
24 * Alan Cox : Use ttl/tos
25 * Alan Cox : Cleaned up old debugging
26 * Alan Cox : Use new kernel side addresses
27 * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets.
28 * Alan Cox : BSD style RAW socket demultiplexing.
29 * Alan Cox : Beginnings of mrouted support.
30 * Alan Cox : Added IP_HDRINCL option.
31 * Alan Cox : Skip broadcast check if BSDism set.
32 * David S. Miller : New socket lookup architecture.
33 *
34 * This program is free software; you can redistribute it and/or
35 * modify it under the terms of the GNU General Public License
36 * as published by the Free Software Foundation; either version
37 * 2 of the License, or (at your option) any later version.
38 */
39
40 #include <linux/types.h>
41 #include <linux/atomic.h>
42 #include <asm/byteorder.h>
43 #include <asm/current.h>
44 #include <asm/uaccess.h>
45 #include <asm/ioctls.h>
46 #include <linux/stddef.h>
47 #include <linux/slab.h>
48 #include <linux/errno.h>
49 #include <linux/kernel.h>
50 #include <linux/export.h>
51 #include <linux/spinlock.h>
52 #include <linux/sockios.h>
53 #include <linux/socket.h>
54 #include <linux/in.h>
55 #include <linux/mroute.h>
56 #include <linux/netdevice.h>
57 #include <linux/in_route.h>
58 #include <linux/route.h>
59 #include <linux/skbuff.h>
60 #include <linux/igmp.h>
61 #include <net/net_namespace.h>
62 #include <net/dst.h>
63 #include <net/sock.h>
64 #include <linux/ip.h>
65 #include <linux/net.h>
66 #include <net/ip.h>
67 #include <net/icmp.h>
68 #include <net/udp.h>
69 #include <net/raw.h>
70 #include <net/snmp.h>
71 #include <net/tcp_states.h>
72 #include <net/inet_common.h>
73 #include <net/checksum.h>
74 #include <net/xfrm.h>
75 #include <linux/rtnetlink.h>
76 #include <linux/proc_fs.h>
77 #include <linux/seq_file.h>
78 #include <linux/netfilter.h>
79 #include <linux/netfilter_ipv4.h>
80 #include <linux/compat.h>
81 #include <linux/uio.h>
82
83 struct raw_frag_vec {
84 struct msghdr *msg;
85 union {
86 struct icmphdr icmph;
87 char c[1];
88 } hdr;
89 int hlen;
90 };
91
92 static struct raw_hashinfo raw_v4_hashinfo = {
93 .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock),
94 };
95
96 int raw_hash_sk(struct sock *sk)
97 {
98 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
99 struct hlist_head *head;
100
101 head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)];
102
103 write_lock_bh(&h->lock);
104 sk_add_node(sk, head);
105 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
106 write_unlock_bh(&h->lock);
107
108 return 0;
109 }
110 EXPORT_SYMBOL_GPL(raw_hash_sk);
111
112 void raw_unhash_sk(struct sock *sk)
113 {
114 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
115
116 write_lock_bh(&h->lock);
117 if (sk_del_node_init(sk))
118 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
119 write_unlock_bh(&h->lock);
120 }
121 EXPORT_SYMBOL_GPL(raw_unhash_sk);
122
123 static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
124 unsigned short num, __be32 raddr, __be32 laddr, int dif)
125 {
126 sk_for_each_from(sk) {
127 struct inet_sock *inet = inet_sk(sk);
128
129 if (net_eq(sock_net(sk), net) && inet->inet_num == num &&
130 !(inet->inet_daddr && inet->inet_daddr != raddr) &&
131 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
132 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
133 goto found; /* gotcha */
134 }
135 sk = NULL;
136 found:
137 return sk;
138 }
139
140 /*
141 * 0 - deliver
142 * 1 - block
143 */
144 static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
145 {
146 struct icmphdr _hdr;
147 const struct icmphdr *hdr;
148
149 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
150 sizeof(_hdr), &_hdr);
151 if (!hdr)
152 return 1;
153
154 if (hdr->type < 32) {
155 __u32 data = raw_sk(sk)->filter.data;
156
157 return ((1U << hdr->type) & data) != 0;
158 }
159
160 /* Do not block unknown ICMP types */
161 return 0;
162 }
163
164 /* IP input processing comes here for RAW socket delivery.
165 * Caller owns SKB, so we must make clones.
166 *
167 * RFC 1122: SHOULD pass TOS value up to the transport layer.
168 * -> It does. And not only TOS, but all IP header.
169 */
170 static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
171 {
172 struct sock *sk;
173 struct hlist_head *head;
174 int delivered = 0;
175 struct net *net;
176
177 read_lock(&raw_v4_hashinfo.lock);
178 head = &raw_v4_hashinfo.ht[hash];
179 if (hlist_empty(head))
180 goto out;
181
182 net = dev_net(skb->dev);
183 sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
184 iph->saddr, iph->daddr,
185 skb->dev->ifindex);
186
187 while (sk) {
188 delivered = 1;
189 if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
190 ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
191 skb->dev->ifindex)) {
192 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
193
194 /* Not releasing hash table! */
195 if (clone)
196 raw_rcv(sk, clone);
197 }
198 sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
199 iph->saddr, iph->daddr,
200 skb->dev->ifindex);
201 }
202 out:
203 read_unlock(&raw_v4_hashinfo.lock);
204 return delivered;
205 }
206
207 int raw_local_deliver(struct sk_buff *skb, int protocol)
208 {
209 int hash;
210 struct sock *raw_sk;
211
212 hash = protocol & (RAW_HTABLE_SIZE - 1);
213 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
214
215 /* If there maybe a raw socket we must check - if not we
216 * don't care less
217 */
218 if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
219 raw_sk = NULL;
220
221 return raw_sk != NULL;
222
223 }
224
225 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
226 {
227 struct inet_sock *inet = inet_sk(sk);
228 const int type = icmp_hdr(skb)->type;
229 const int code = icmp_hdr(skb)->code;
230 int err = 0;
231 int harderr = 0;
232
233 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
234 ipv4_sk_update_pmtu(skb, sk, info);
235 else if (type == ICMP_REDIRECT) {
236 ipv4_sk_redirect(skb, sk);
237 return;
238 }
239
240 /* Report error on raw socket, if:
241 1. User requested ip_recverr.
242 2. Socket is connected (otherwise the error indication
243 is useless without ip_recverr and error is hard.
244 */
245 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
246 return;
247
248 switch (type) {
249 default:
250 case ICMP_TIME_EXCEEDED:
251 err = EHOSTUNREACH;
252 break;
253 case ICMP_SOURCE_QUENCH:
254 return;
255 case ICMP_PARAMETERPROB:
256 err = EPROTO;
257 harderr = 1;
258 break;
259 case ICMP_DEST_UNREACH:
260 err = EHOSTUNREACH;
261 if (code > NR_ICMP_UNREACH)
262 break;
263 err = icmp_err_convert[code].errno;
264 harderr = icmp_err_convert[code].fatal;
265 if (code == ICMP_FRAG_NEEDED) {
266 harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
267 err = EMSGSIZE;
268 }
269 }
270
271 if (inet->recverr) {
272 const struct iphdr *iph = (const struct iphdr *)skb->data;
273 u8 *payload = skb->data + (iph->ihl << 2);
274
275 if (inet->hdrincl)
276 payload = skb->data;
277 ip_icmp_error(sk, skb, err, 0, info, payload);
278 }
279
280 if (inet->recverr || harderr) {
281 sk->sk_err = err;
282 sk->sk_error_report(sk);
283 }
284 }
285
286 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
287 {
288 int hash;
289 struct sock *raw_sk;
290 const struct iphdr *iph;
291 struct net *net;
292
293 hash = protocol & (RAW_HTABLE_SIZE - 1);
294
295 read_lock(&raw_v4_hashinfo.lock);
296 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
297 if (raw_sk) {
298 iph = (const struct iphdr *)skb->data;
299 net = dev_net(skb->dev);
300
301 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
302 iph->daddr, iph->saddr,
303 skb->dev->ifindex)) != NULL) {
304 raw_err(raw_sk, skb, info);
305 raw_sk = sk_next(raw_sk);
306 iph = (const struct iphdr *)skb->data;
307 }
308 }
309 read_unlock(&raw_v4_hashinfo.lock);
310 }
311
312 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
313 {
314 /* Charge it to the socket. */
315
316 ipv4_pktinfo_prepare(sk, skb);
317 if (sock_queue_rcv_skb(sk, skb) < 0) {
318 kfree_skb(skb);
319 return NET_RX_DROP;
320 }
321
322 return NET_RX_SUCCESS;
323 }
324
325 int raw_rcv(struct sock *sk, struct sk_buff *skb)
326 {
327 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
328 atomic_inc(&sk->sk_drops);
329 kfree_skb(skb);
330 return NET_RX_DROP;
331 }
332 nf_reset(skb);
333
334 skb_push(skb, skb->data - skb_network_header(skb));
335
336 raw_rcv_skb(sk, skb);
337 return 0;
338 }
339
340 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
341 struct msghdr *msg, size_t length,
342 struct rtable **rtp,
343 unsigned int flags)
344 {
345 struct inet_sock *inet = inet_sk(sk);
346 struct net *net = sock_net(sk);
347 struct iphdr *iph;
348 struct sk_buff *skb;
349 unsigned int iphlen;
350 int err;
351 struct rtable *rt = *rtp;
352 int hlen, tlen;
353
354 if (length > rt->dst.dev->mtu) {
355 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
356 rt->dst.dev->mtu);
357 return -EMSGSIZE;
358 }
359 if (flags&MSG_PROBE)
360 goto out;
361
362 hlen = LL_RESERVED_SPACE(rt->dst.dev);
363 tlen = rt->dst.dev->needed_tailroom;
364 skb = sock_alloc_send_skb(sk,
365 length + hlen + tlen + 15,
366 flags & MSG_DONTWAIT, &err);
367 if (!skb)
368 goto error;
369 skb_reserve(skb, hlen);
370
371 skb->priority = sk->sk_priority;
372 skb->mark = sk->sk_mark;
373 skb_dst_set(skb, &rt->dst);
374 *rtp = NULL;
375
376 skb_reset_network_header(skb);
377 iph = ip_hdr(skb);
378 skb_put(skb, length);
379
380 skb->ip_summed = CHECKSUM_NONE;
381
382 sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
383
384 skb->transport_header = skb->network_header;
385 err = -EFAULT;
386 if (memcpy_from_msg(iph, msg, length))
387 goto error_free;
388
389 iphlen = iph->ihl * 4;
390
391 /*
392 * We don't want to modify the ip header, but we do need to
393 * be sure that it won't cause problems later along the network
394 * stack. Specifically we want to make sure that iph->ihl is a
395 * sane value. If ihl points beyond the length of the buffer passed
396 * in, reject the frame as invalid
397 */
398 err = -EINVAL;
399 if (iphlen > length)
400 goto error_free;
401
402 if (iphlen >= sizeof(*iph)) {
403 if (!iph->saddr)
404 iph->saddr = fl4->saddr;
405 iph->check = 0;
406 iph->tot_len = htons(length);
407 if (!iph->id)
408 ip_select_ident(net, skb, NULL);
409
410 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
411 skb->transport_header += iphlen;
412 if (iph->protocol == IPPROTO_ICMP &&
413 length >= iphlen + sizeof(struct icmphdr))
414 icmp_out_count(net, ((struct icmphdr *)
415 skb_transport_header(skb))->type);
416 }
417
418 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
419 net, sk, skb, NULL, rt->dst.dev,
420 dst_output);
421 if (err > 0)
422 err = net_xmit_errno(err);
423 if (err)
424 goto error;
425 out:
426 return 0;
427
428 error_free:
429 kfree_skb(skb);
430 error:
431 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
432 if (err == -ENOBUFS && !inet->recverr)
433 err = 0;
434 return err;
435 }
436
437 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4)
438 {
439 int err;
440
441 if (fl4->flowi4_proto != IPPROTO_ICMP)
442 return 0;
443
444 /* We only need the first two bytes. */
445 rfv->hlen = 2;
446
447 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
448 if (err)
449 return err;
450
451 fl4->fl4_icmp_type = rfv->hdr.icmph.type;
452 fl4->fl4_icmp_code = rfv->hdr.icmph.code;
453
454 return 0;
455 }
456
457 static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
458 struct sk_buff *skb)
459 {
460 struct raw_frag_vec *rfv = from;
461
462 if (offset < rfv->hlen) {
463 int copy = min(rfv->hlen - offset, len);
464
465 if (skb->ip_summed == CHECKSUM_PARTIAL)
466 memcpy(to, rfv->hdr.c + offset, copy);
467 else
468 skb->csum = csum_block_add(
469 skb->csum,
470 csum_partial_copy_nocheck(rfv->hdr.c + offset,
471 to, copy, 0),
472 odd);
473
474 odd = 0;
475 offset += copy;
476 to += copy;
477 len -= copy;
478
479 if (!len)
480 return 0;
481 }
482
483 offset -= rfv->hlen;
484
485 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
486 }
487
488 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
489 {
490 struct inet_sock *inet = inet_sk(sk);
491 struct net *net = sock_net(sk);
492 struct ipcm_cookie ipc;
493 struct rtable *rt = NULL;
494 struct flowi4 fl4;
495 int free = 0;
496 __be32 daddr;
497 __be32 saddr;
498 u8 tos;
499 int err;
500 struct ip_options_data opt_copy;
501 struct raw_frag_vec rfv;
502
503 err = -EMSGSIZE;
504 if (len > 0xFFFF)
505 goto out;
506
507 /*
508 * Check the flags.
509 */
510
511 err = -EOPNOTSUPP;
512 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
513 goto out; /* compatibility */
514
515 /*
516 * Get and verify the address.
517 */
518
519 if (msg->msg_namelen) {
520 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
521 err = -EINVAL;
522 if (msg->msg_namelen < sizeof(*usin))
523 goto out;
524 if (usin->sin_family != AF_INET) {
525 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
526 __func__, current->comm);
527 err = -EAFNOSUPPORT;
528 if (usin->sin_family)
529 goto out;
530 }
531 daddr = usin->sin_addr.s_addr;
532 /* ANK: I did not forget to get protocol from port field.
533 * I just do not know, who uses this weirdness.
534 * IP_HDRINCL is much more convenient.
535 */
536 } else {
537 err = -EDESTADDRREQ;
538 if (sk->sk_state != TCP_ESTABLISHED)
539 goto out;
540 daddr = inet->inet_daddr;
541 }
542
543 ipc.addr = inet->inet_saddr;
544 ipc.opt = NULL;
545 ipc.tx_flags = 0;
546 ipc.ttl = 0;
547 ipc.tos = -1;
548 ipc.oif = sk->sk_bound_dev_if;
549
550 if (msg->msg_controllen) {
551 err = ip_cmsg_send(net, msg, &ipc, false);
552 if (unlikely(err)) {
553 kfree(ipc.opt);
554 goto out;
555 }
556 if (ipc.opt)
557 free = 1;
558 }
559
560 saddr = ipc.addr;
561 ipc.addr = daddr;
562
563 if (!ipc.opt) {
564 struct ip_options_rcu *inet_opt;
565
566 rcu_read_lock();
567 inet_opt = rcu_dereference(inet->inet_opt);
568 if (inet_opt) {
569 memcpy(&opt_copy, inet_opt,
570 sizeof(*inet_opt) + inet_opt->opt.optlen);
571 ipc.opt = &opt_copy.opt;
572 }
573 rcu_read_unlock();
574 }
575
576 if (ipc.opt) {
577 err = -EINVAL;
578 /* Linux does not mangle headers on raw sockets,
579 * so that IP options + IP_HDRINCL is non-sense.
580 */
581 if (inet->hdrincl)
582 goto done;
583 if (ipc.opt->opt.srr) {
584 if (!daddr)
585 goto done;
586 daddr = ipc.opt->opt.faddr;
587 }
588 }
589 tos = get_rtconn_flags(&ipc, sk);
590 if (msg->msg_flags & MSG_DONTROUTE)
591 tos |= RTO_ONLINK;
592
593 if (ipv4_is_multicast(daddr)) {
594 if (!ipc.oif)
595 ipc.oif = inet->mc_index;
596 if (!saddr)
597 saddr = inet->mc_addr;
598 } else if (!ipc.oif)
599 ipc.oif = inet->uc_index;
600
601 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
602 RT_SCOPE_UNIVERSE,
603 inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
604 inet_sk_flowi_flags(sk) |
605 (inet->hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
606 daddr, saddr, 0, 0);
607
608 if (!saddr && ipc.oif) {
609 err = l3mdev_get_saddr(net, ipc.oif, &fl4);
610 if (err < 0)
611 goto done;
612 }
613
614 if (!inet->hdrincl) {
615 rfv.msg = msg;
616 rfv.hlen = 0;
617
618 err = raw_probe_proto_opt(&rfv, &fl4);
619 if (err)
620 goto done;
621 }
622
623 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
624 rt = ip_route_output_flow(net, &fl4, sk);
625 if (IS_ERR(rt)) {
626 err = PTR_ERR(rt);
627 rt = NULL;
628 goto done;
629 }
630
631 err = -EACCES;
632 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
633 goto done;
634
635 if (msg->msg_flags & MSG_CONFIRM)
636 goto do_confirm;
637 back_from_confirm:
638
639 if (inet->hdrincl)
640 err = raw_send_hdrinc(sk, &fl4, msg, len,
641 &rt, msg->msg_flags);
642
643 else {
644 sock_tx_timestamp(sk, &ipc.tx_flags);
645
646 if (!ipc.addr)
647 ipc.addr = fl4.daddr;
648 lock_sock(sk);
649 err = ip_append_data(sk, &fl4, raw_getfrag,
650 &rfv, len, 0,
651 &ipc, &rt, msg->msg_flags);
652 if (err)
653 ip_flush_pending_frames(sk);
654 else if (!(msg->msg_flags & MSG_MORE)) {
655 err = ip_push_pending_frames(sk, &fl4);
656 if (err == -ENOBUFS && !inet->recverr)
657 err = 0;
658 }
659 release_sock(sk);
660 }
661 done:
662 if (free)
663 kfree(ipc.opt);
664 ip_rt_put(rt);
665
666 out:
667 if (err < 0)
668 return err;
669 return len;
670
671 do_confirm:
672 dst_confirm(&rt->dst);
673 if (!(msg->msg_flags & MSG_PROBE) || len)
674 goto back_from_confirm;
675 err = 0;
676 goto done;
677 }
678
679 static void raw_close(struct sock *sk, long timeout)
680 {
681 /*
682 * Raw sockets may have direct kernel references. Kill them.
683 */
684 ip_ra_control(sk, 0, NULL);
685
686 sk_common_release(sk);
687 }
688
689 static void raw_destroy(struct sock *sk)
690 {
691 lock_sock(sk);
692 ip_flush_pending_frames(sk);
693 release_sock(sk);
694 }
695
696 /* This gets rid of all the nasties in af_inet. -DaveM */
697 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
698 {
699 struct inet_sock *inet = inet_sk(sk);
700 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
701 int ret = -EINVAL;
702 int chk_addr_ret;
703
704 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
705 goto out;
706 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
707 ret = -EADDRNOTAVAIL;
708 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
709 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
710 goto out;
711 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
712 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
713 inet->inet_saddr = 0; /* Use device */
714 sk_dst_reset(sk);
715 ret = 0;
716 out: return ret;
717 }
718
719 /*
720 * This should be easy, if there is something there
721 * we return it, otherwise we block.
722 */
723
724 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
725 int noblock, int flags, int *addr_len)
726 {
727 struct inet_sock *inet = inet_sk(sk);
728 size_t copied = 0;
729 int err = -EOPNOTSUPP;
730 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
731 struct sk_buff *skb;
732
733 if (flags & MSG_OOB)
734 goto out;
735
736 if (flags & MSG_ERRQUEUE) {
737 err = ip_recv_error(sk, msg, len, addr_len);
738 goto out;
739 }
740
741 skb = skb_recv_datagram(sk, flags, noblock, &err);
742 if (!skb)
743 goto out;
744
745 copied = skb->len;
746 if (len < copied) {
747 msg->msg_flags |= MSG_TRUNC;
748 copied = len;
749 }
750
751 err = skb_copy_datagram_msg(skb, 0, msg, copied);
752 if (err)
753 goto done;
754
755 sock_recv_ts_and_drops(msg, sk, skb);
756
757 /* Copy the address. */
758 if (sin) {
759 sin->sin_family = AF_INET;
760 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
761 sin->sin_port = 0;
762 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
763 *addr_len = sizeof(*sin);
764 }
765 if (inet->cmsg_flags)
766 ip_cmsg_recv(msg, skb);
767 if (flags & MSG_TRUNC)
768 copied = skb->len;
769 done:
770 skb_free_datagram(sk, skb);
771 out:
772 if (err)
773 return err;
774 return copied;
775 }
776
777 static int raw_init(struct sock *sk)
778 {
779 struct raw_sock *rp = raw_sk(sk);
780
781 if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
782 memset(&rp->filter, 0, sizeof(rp->filter));
783 return 0;
784 }
785
786 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
787 {
788 if (optlen > sizeof(struct icmp_filter))
789 optlen = sizeof(struct icmp_filter);
790 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
791 return -EFAULT;
792 return 0;
793 }
794
795 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
796 {
797 int len, ret = -EFAULT;
798
799 if (get_user(len, optlen))
800 goto out;
801 ret = -EINVAL;
802 if (len < 0)
803 goto out;
804 if (len > sizeof(struct icmp_filter))
805 len = sizeof(struct icmp_filter);
806 ret = -EFAULT;
807 if (put_user(len, optlen) ||
808 copy_to_user(optval, &raw_sk(sk)->filter, len))
809 goto out;
810 ret = 0;
811 out: return ret;
812 }
813
814 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
815 char __user *optval, unsigned int optlen)
816 {
817 if (optname == ICMP_FILTER) {
818 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
819 return -EOPNOTSUPP;
820 else
821 return raw_seticmpfilter(sk, optval, optlen);
822 }
823 return -ENOPROTOOPT;
824 }
825
826 static int raw_setsockopt(struct sock *sk, int level, int optname,
827 char __user *optval, unsigned int optlen)
828 {
829 if (level != SOL_RAW)
830 return ip_setsockopt(sk, level, optname, optval, optlen);
831 return do_raw_setsockopt(sk, level, optname, optval, optlen);
832 }
833
834 #ifdef CONFIG_COMPAT
835 static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
836 char __user *optval, unsigned int optlen)
837 {
838 if (level != SOL_RAW)
839 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
840 return do_raw_setsockopt(sk, level, optname, optval, optlen);
841 }
842 #endif
843
844 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
845 char __user *optval, int __user *optlen)
846 {
847 if (optname == ICMP_FILTER) {
848 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
849 return -EOPNOTSUPP;
850 else
851 return raw_geticmpfilter(sk, optval, optlen);
852 }
853 return -ENOPROTOOPT;
854 }
855
856 static int raw_getsockopt(struct sock *sk, int level, int optname,
857 char __user *optval, int __user *optlen)
858 {
859 if (level != SOL_RAW)
860 return ip_getsockopt(sk, level, optname, optval, optlen);
861 return do_raw_getsockopt(sk, level, optname, optval, optlen);
862 }
863
864 #ifdef CONFIG_COMPAT
865 static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
866 char __user *optval, int __user *optlen)
867 {
868 if (level != SOL_RAW)
869 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
870 return do_raw_getsockopt(sk, level, optname, optval, optlen);
871 }
872 #endif
873
874 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
875 {
876 switch (cmd) {
877 case SIOCOUTQ: {
878 int amount = sk_wmem_alloc_get(sk);
879
880 return put_user(amount, (int __user *)arg);
881 }
882 case SIOCINQ: {
883 struct sk_buff *skb;
884 int amount = 0;
885
886 spin_lock_bh(&sk->sk_receive_queue.lock);
887 skb = skb_peek(&sk->sk_receive_queue);
888 if (skb)
889 amount = skb->len;
890 spin_unlock_bh(&sk->sk_receive_queue.lock);
891 return put_user(amount, (int __user *)arg);
892 }
893
894 default:
895 #ifdef CONFIG_IP_MROUTE
896 return ipmr_ioctl(sk, cmd, (void __user *)arg);
897 #else
898 return -ENOIOCTLCMD;
899 #endif
900 }
901 }
902
903 #ifdef CONFIG_COMPAT
904 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
905 {
906 switch (cmd) {
907 case SIOCOUTQ:
908 case SIOCINQ:
909 return -ENOIOCTLCMD;
910 default:
911 #ifdef CONFIG_IP_MROUTE
912 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
913 #else
914 return -ENOIOCTLCMD;
915 #endif
916 }
917 }
918 #endif
919
920 struct proto raw_prot = {
921 .name = "RAW",
922 .owner = THIS_MODULE,
923 .close = raw_close,
924 .destroy = raw_destroy,
925 .connect = ip4_datagram_connect,
926 .disconnect = udp_disconnect,
927 .ioctl = raw_ioctl,
928 .init = raw_init,
929 .setsockopt = raw_setsockopt,
930 .getsockopt = raw_getsockopt,
931 .sendmsg = raw_sendmsg,
932 .recvmsg = raw_recvmsg,
933 .bind = raw_bind,
934 .backlog_rcv = raw_rcv_skb,
935 .release_cb = ip4_datagram_release_cb,
936 .hash = raw_hash_sk,
937 .unhash = raw_unhash_sk,
938 .obj_size = sizeof(struct raw_sock),
939 .h.raw_hash = &raw_v4_hashinfo,
940 #ifdef CONFIG_COMPAT
941 .compat_setsockopt = compat_raw_setsockopt,
942 .compat_getsockopt = compat_raw_getsockopt,
943 .compat_ioctl = compat_raw_ioctl,
944 #endif
945 };
946
947 #ifdef CONFIG_PROC_FS
948 static struct sock *raw_get_first(struct seq_file *seq)
949 {
950 struct sock *sk;
951 struct raw_iter_state *state = raw_seq_private(seq);
952
953 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
954 ++state->bucket) {
955 sk_for_each(sk, &state->h->ht[state->bucket])
956 if (sock_net(sk) == seq_file_net(seq))
957 goto found;
958 }
959 sk = NULL;
960 found:
961 return sk;
962 }
963
964 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
965 {
966 struct raw_iter_state *state = raw_seq_private(seq);
967
968 do {
969 sk = sk_next(sk);
970 try_again:
971 ;
972 } while (sk && sock_net(sk) != seq_file_net(seq));
973
974 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
975 sk = sk_head(&state->h->ht[state->bucket]);
976 goto try_again;
977 }
978 return sk;
979 }
980
981 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
982 {
983 struct sock *sk = raw_get_first(seq);
984
985 if (sk)
986 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
987 --pos;
988 return pos ? NULL : sk;
989 }
990
991 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
992 {
993 struct raw_iter_state *state = raw_seq_private(seq);
994
995 read_lock(&state->h->lock);
996 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
997 }
998 EXPORT_SYMBOL_GPL(raw_seq_start);
999
1000 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1001 {
1002 struct sock *sk;
1003
1004 if (v == SEQ_START_TOKEN)
1005 sk = raw_get_first(seq);
1006 else
1007 sk = raw_get_next(seq, v);
1008 ++*pos;
1009 return sk;
1010 }
1011 EXPORT_SYMBOL_GPL(raw_seq_next);
1012
1013 void raw_seq_stop(struct seq_file *seq, void *v)
1014 {
1015 struct raw_iter_state *state = raw_seq_private(seq);
1016
1017 read_unlock(&state->h->lock);
1018 }
1019 EXPORT_SYMBOL_GPL(raw_seq_stop);
1020
1021 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1022 {
1023 struct inet_sock *inet = inet_sk(sp);
1024 __be32 dest = inet->inet_daddr,
1025 src = inet->inet_rcv_saddr;
1026 __u16 destp = 0,
1027 srcp = inet->inet_num;
1028
1029 seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
1030 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
1031 i, src, srcp, dest, destp, sp->sk_state,
1032 sk_wmem_alloc_get(sp),
1033 sk_rmem_alloc_get(sp),
1034 0, 0L, 0,
1035 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1036 0, sock_i_ino(sp),
1037 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1038 }
1039
1040 static int raw_seq_show(struct seq_file *seq, void *v)
1041 {
1042 if (v == SEQ_START_TOKEN)
1043 seq_printf(seq, " sl local_address rem_address st tx_queue "
1044 "rx_queue tr tm->when retrnsmt uid timeout "
1045 "inode ref pointer drops\n");
1046 else
1047 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1048 return 0;
1049 }
1050
1051 static const struct seq_operations raw_seq_ops = {
1052 .start = raw_seq_start,
1053 .next = raw_seq_next,
1054 .stop = raw_seq_stop,
1055 .show = raw_seq_show,
1056 };
1057
1058 int raw_seq_open(struct inode *ino, struct file *file,
1059 struct raw_hashinfo *h, const struct seq_operations *ops)
1060 {
1061 int err;
1062 struct raw_iter_state *i;
1063
1064 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
1065 if (err < 0)
1066 return err;
1067
1068 i = raw_seq_private((struct seq_file *)file->private_data);
1069 i->h = h;
1070 return 0;
1071 }
1072 EXPORT_SYMBOL_GPL(raw_seq_open);
1073
1074 static int raw_v4_seq_open(struct inode *inode, struct file *file)
1075 {
1076 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
1077 }
1078
1079 static const struct file_operations raw_seq_fops = {
1080 .owner = THIS_MODULE,
1081 .open = raw_v4_seq_open,
1082 .read = seq_read,
1083 .llseek = seq_lseek,
1084 .release = seq_release_net,
1085 };
1086
1087 static __net_init int raw_init_net(struct net *net)
1088 {
1089 if (!proc_create("raw", S_IRUGO, net->proc_net, &raw_seq_fops))
1090 return -ENOMEM;
1091
1092 return 0;
1093 }
1094
1095 static __net_exit void raw_exit_net(struct net *net)
1096 {
1097 remove_proc_entry("raw", net->proc_net);
1098 }
1099
1100 static __net_initdata struct pernet_operations raw_net_ops = {
1101 .init = raw_init_net,
1102 .exit = raw_exit_net,
1103 };
1104
1105 int __init raw_proc_init(void)
1106 {
1107 return register_pernet_subsys(&raw_net_ops);
1108 }
1109
1110 void __init raw_proc_exit(void)
1111 {
1112 unregister_pernet_subsys(&raw_net_ops);
1113 }
1114 #endif /* CONFIG_PROC_FS */
Linux kernel - Deliverables
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