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gro: Allow tunnel stacking in the case of FOU/GUE
[linux/fpc-iii.git] / net / ipv4 / raw.c
blobc77aac75759d94fc2dca10aee4f83d7ece21b1a7
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 void 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 EXPORT_SYMBOL_GPL(raw_hash_sk);
109
110 void raw_unhash_sk(struct sock *sk)
111 {
112 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
113
114 write_lock_bh(&h->lock);
115 if (sk_del_node_init(sk))
116 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
117 write_unlock_bh(&h->lock);
118 }
119 EXPORT_SYMBOL_GPL(raw_unhash_sk);
120
121 static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
122 unsigned short num, __be32 raddr, __be32 laddr, int dif)
123 {
124 sk_for_each_from(sk) {
125 struct inet_sock *inet = inet_sk(sk);
126
127 if (net_eq(sock_net(sk), net) && inet->inet_num == num &&
128 !(inet->inet_daddr && inet->inet_daddr != raddr) &&
129 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
130 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
131 goto found; /* gotcha */
132 }
133 sk = NULL;
134 found:
135 return sk;
136 }
137
138 /*
139 * 0 - deliver
140 * 1 - block
141 */
142 static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
143 {
144 struct icmphdr _hdr;
145 const struct icmphdr *hdr;
146
147 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
148 sizeof(_hdr), &_hdr);
149 if (!hdr)
150 return 1;
151
152 if (hdr->type < 32) {
153 __u32 data = raw_sk(sk)->filter.data;
154
155 return ((1U << hdr->type) & data) != 0;
156 }
157
158 /* Do not block unknown ICMP types */
159 return 0;
160 }
161
162 /* IP input processing comes here for RAW socket delivery.
163 * Caller owns SKB, so we must make clones.
164 *
165 * RFC 1122: SHOULD pass TOS value up to the transport layer.
166 * -> It does. And not only TOS, but all IP header.
167 */
168 static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
169 {
170 struct sock *sk;
171 struct hlist_head *head;
172 int delivered = 0;
173 struct net *net;
174
175 read_lock(&raw_v4_hashinfo.lock);
176 head = &raw_v4_hashinfo.ht[hash];
177 if (hlist_empty(head))
178 goto out;
179
180 net = dev_net(skb->dev);
181 sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
182 iph->saddr, iph->daddr,
183 skb->dev->ifindex);
184
185 while (sk) {
186 delivered = 1;
187 if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
188 ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
189 skb->dev->ifindex)) {
190 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
191
192 /* Not releasing hash table! */
193 if (clone)
194 raw_rcv(sk, clone);
195 }
196 sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
197 iph->saddr, iph->daddr,
198 skb->dev->ifindex);
199 }
200 out:
201 read_unlock(&raw_v4_hashinfo.lock);
202 return delivered;
203 }
204
205 int raw_local_deliver(struct sk_buff *skb, int protocol)
206 {
207 int hash;
208 struct sock *raw_sk;
209
210 hash = protocol & (RAW_HTABLE_SIZE - 1);
211 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
212
213 /* If there maybe a raw socket we must check - if not we
214 * don't care less
215 */
216 if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
217 raw_sk = NULL;
218
219 return raw_sk != NULL;
220
221 }
222
223 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
224 {
225 struct inet_sock *inet = inet_sk(sk);
226 const int type = icmp_hdr(skb)->type;
227 const int code = icmp_hdr(skb)->code;
228 int err = 0;
229 int harderr = 0;
230
231 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
232 ipv4_sk_update_pmtu(skb, sk, info);
233 else if (type == ICMP_REDIRECT) {
234 ipv4_sk_redirect(skb, sk);
235 return;
236 }
237
238 /* Report error on raw socket, if:
239 1. User requested ip_recverr.
240 2. Socket is connected (otherwise the error indication
241 is useless without ip_recverr and error is hard.
242 */
243 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
244 return;
245
246 switch (type) {
247 default:
248 case ICMP_TIME_EXCEEDED:
249 err = EHOSTUNREACH;
250 break;
251 case ICMP_SOURCE_QUENCH:
252 return;
253 case ICMP_PARAMETERPROB:
254 err = EPROTO;
255 harderr = 1;
256 break;
257 case ICMP_DEST_UNREACH:
258 err = EHOSTUNREACH;
259 if (code > NR_ICMP_UNREACH)
260 break;
261 err = icmp_err_convert[code].errno;
262 harderr = icmp_err_convert[code].fatal;
263 if (code == ICMP_FRAG_NEEDED) {
264 harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
265 err = EMSGSIZE;
266 }
267 }
268
269 if (inet->recverr) {
270 const struct iphdr *iph = (const struct iphdr *)skb->data;
271 u8 *payload = skb->data + (iph->ihl << 2);
272
273 if (inet->hdrincl)
274 payload = skb->data;
275 ip_icmp_error(sk, skb, err, 0, info, payload);
276 }
277
278 if (inet->recverr || harderr) {
279 sk->sk_err = err;
280 sk->sk_error_report(sk);
281 }
282 }
283
284 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
285 {
286 int hash;
287 struct sock *raw_sk;
288 const struct iphdr *iph;
289 struct net *net;
290
291 hash = protocol & (RAW_HTABLE_SIZE - 1);
292
293 read_lock(&raw_v4_hashinfo.lock);
294 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
295 if (raw_sk) {
296 iph = (const struct iphdr *)skb->data;
297 net = dev_net(skb->dev);
298
299 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
300 iph->daddr, iph->saddr,
301 skb->dev->ifindex)) != NULL) {
302 raw_err(raw_sk, skb, info);
303 raw_sk = sk_next(raw_sk);
304 iph = (const struct iphdr *)skb->data;
305 }
306 }
307 read_unlock(&raw_v4_hashinfo.lock);
308 }
309
310 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
311 {
312 /* Charge it to the socket. */
313
314 ipv4_pktinfo_prepare(sk, skb);
315 if (sock_queue_rcv_skb(sk, skb) < 0) {
316 kfree_skb(skb);
317 return NET_RX_DROP;
318 }
319
320 return NET_RX_SUCCESS;
321 }
322
323 int raw_rcv(struct sock *sk, struct sk_buff *skb)
324 {
325 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
326 atomic_inc(&sk->sk_drops);
327 kfree_skb(skb);
328 return NET_RX_DROP;
329 }
330 nf_reset(skb);
331
332 skb_push(skb, skb->data - skb_network_header(skb));
333
334 raw_rcv_skb(sk, skb);
335 return 0;
336 }
337
338 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
339 struct msghdr *msg, size_t length,
340 struct rtable **rtp,
341 unsigned int flags)
342 {
343 struct inet_sock *inet = inet_sk(sk);
344 struct net *net = sock_net(sk);
345 struct iphdr *iph;
346 struct sk_buff *skb;
347 unsigned int iphlen;
348 int err;
349 struct rtable *rt = *rtp;
350 int hlen, tlen;
351
352 if (length > rt->dst.dev->mtu) {
353 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
354 rt->dst.dev->mtu);
355 return -EMSGSIZE;
356 }
357 if (flags&MSG_PROBE)
358 goto out;
359
360 hlen = LL_RESERVED_SPACE(rt->dst.dev);
361 tlen = rt->dst.dev->needed_tailroom;
362 skb = sock_alloc_send_skb(sk,
363 length + hlen + tlen + 15,
364 flags & MSG_DONTWAIT, &err);
365 if (!skb)
366 goto error;
367 skb_reserve(skb, hlen);
368
369 skb->priority = sk->sk_priority;
370 skb->mark = sk->sk_mark;
371 skb_dst_set(skb, &rt->dst);
372 *rtp = NULL;
373
374 skb_reset_network_header(skb);
375 iph = ip_hdr(skb);
376 skb_put(skb, length);
377
378 skb->ip_summed = CHECKSUM_NONE;
379
380 sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
381
382 skb->transport_header = skb->network_header;
383 err = -EFAULT;
384 if (memcpy_from_msg(iph, msg, length))
385 goto error_free;
386
387 iphlen = iph->ihl * 4;
388
389 /*
390 * We don't want to modify the ip header, but we do need to
391 * be sure that it won't cause problems later along the network
392 * stack. Specifically we want to make sure that iph->ihl is a
393 * sane value. If ihl points beyond the length of the buffer passed
394 * in, reject the frame as invalid
395 */
396 err = -EINVAL;
397 if (iphlen > length)
398 goto error_free;
399
400 if (iphlen >= sizeof(*iph)) {
401 if (!iph->saddr)
402 iph->saddr = fl4->saddr;
403 iph->check = 0;
404 iph->tot_len = htons(length);
405 if (!iph->id)
406 ip_select_ident(net, skb, NULL);
407
408 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
409 }
410 if (iph->protocol == IPPROTO_ICMP)
411 icmp_out_count(net, ((struct icmphdr *)
412 skb_transport_header(skb))->type);
413
414 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, sk, skb,
415 NULL, rt->dst.dev, dst_output_sk);
416 if (err > 0)
417 err = net_xmit_errno(err);
418 if (err)
419 goto error;
420 out:
421 return 0;
422
423 error_free:
424 kfree_skb(skb);
425 error:
426 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
427 if (err == -ENOBUFS && !inet->recverr)
428 err = 0;
429 return err;
430 }
431
432 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4)
433 {
434 int err;
435
436 if (fl4->flowi4_proto != IPPROTO_ICMP)
437 return 0;
438
439 /* We only need the first two bytes. */
440 rfv->hlen = 2;
441
442 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
443 if (err)
444 return err;
445
446 fl4->fl4_icmp_type = rfv->hdr.icmph.type;
447 fl4->fl4_icmp_code = rfv->hdr.icmph.code;
448
449 return 0;
450 }
451
452 static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
453 struct sk_buff *skb)
454 {
455 struct raw_frag_vec *rfv = from;
456
457 if (offset < rfv->hlen) {
458 int copy = min(rfv->hlen - offset, len);
459
460 if (skb->ip_summed == CHECKSUM_PARTIAL)
461 memcpy(to, rfv->hdr.c + offset, copy);
462 else
463 skb->csum = csum_block_add(
464 skb->csum,
465 csum_partial_copy_nocheck(rfv->hdr.c + offset,
466 to, copy, 0),
467 odd);
468
469 odd = 0;
470 offset += copy;
471 to += copy;
472 len -= copy;
473
474 if (!len)
475 return 0;
476 }
477
478 offset -= rfv->hlen;
479
480 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
481 }
482
483 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
484 {
485 struct inet_sock *inet = inet_sk(sk);
486 struct ipcm_cookie ipc;
487 struct rtable *rt = NULL;
488 struct flowi4 fl4;
489 int free = 0;
490 __be32 daddr;
491 __be32 saddr;
492 u8 tos;
493 int err;
494 struct ip_options_data opt_copy;
495 struct raw_frag_vec rfv;
496
497 err = -EMSGSIZE;
498 if (len > 0xFFFF)
499 goto out;
500
501 /*
502 * Check the flags.
503 */
504
505 err = -EOPNOTSUPP;
506 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
507 goto out; /* compatibility */
508
509 /*
510 * Get and verify the address.
511 */
512
513 if (msg->msg_namelen) {
514 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
515 err = -EINVAL;
516 if (msg->msg_namelen < sizeof(*usin))
517 goto out;
518 if (usin->sin_family != AF_INET) {
519 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
520 __func__, current->comm);
521 err = -EAFNOSUPPORT;
522 if (usin->sin_family)
523 goto out;
524 }
525 daddr = usin->sin_addr.s_addr;
526 /* ANK: I did not forget to get protocol from port field.
527 * I just do not know, who uses this weirdness.
528 * IP_HDRINCL is much more convenient.
529 */
530 } else {
531 err = -EDESTADDRREQ;
532 if (sk->sk_state != TCP_ESTABLISHED)
533 goto out;
534 daddr = inet->inet_daddr;
535 }
536
537 ipc.addr = inet->inet_saddr;
538 ipc.opt = NULL;
539 ipc.tx_flags = 0;
540 ipc.ttl = 0;
541 ipc.tos = -1;
542 ipc.oif = sk->sk_bound_dev_if;
543
544 if (msg->msg_controllen) {
545 err = ip_cmsg_send(sock_net(sk), msg, &ipc, false);
546 if (unlikely(err)) {
547 kfree(ipc.opt);
548 goto out;
549 }
550 if (ipc.opt)
551 free = 1;
552 }
553
554 saddr = ipc.addr;
555 ipc.addr = daddr;
556
557 if (!ipc.opt) {
558 struct ip_options_rcu *inet_opt;
559
560 rcu_read_lock();
561 inet_opt = rcu_dereference(inet->inet_opt);
562 if (inet_opt) {
563 memcpy(&opt_copy, inet_opt,
564 sizeof(*inet_opt) + inet_opt->opt.optlen);
565 ipc.opt = &opt_copy.opt;
566 }
567 rcu_read_unlock();
568 }
569
570 if (ipc.opt) {
571 err = -EINVAL;
572 /* Linux does not mangle headers on raw sockets,
573 * so that IP options + IP_HDRINCL is non-sense.
574 */
575 if (inet->hdrincl)
576 goto done;
577 if (ipc.opt->opt.srr) {
578 if (!daddr)
579 goto done;
580 daddr = ipc.opt->opt.faddr;
581 }
582 }
583 tos = get_rtconn_flags(&ipc, sk);
584 if (msg->msg_flags & MSG_DONTROUTE)
585 tos |= RTO_ONLINK;
586
587 if (ipv4_is_multicast(daddr)) {
588 if (!ipc.oif)
589 ipc.oif = inet->mc_index;
590 if (!saddr)
591 saddr = inet->mc_addr;
592 } else if (!ipc.oif)
593 ipc.oif = inet->uc_index;
594
595 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
596 RT_SCOPE_UNIVERSE,
597 inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
598 inet_sk_flowi_flags(sk) |
599 (inet->hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
600 daddr, saddr, 0, 0);
601
602 if (!inet->hdrincl) {
603 rfv.msg = msg;
604 rfv.hlen = 0;
605
606 err = raw_probe_proto_opt(&rfv, &fl4);
607 if (err)
608 goto done;
609 }
610
611 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
612 rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
613 if (IS_ERR(rt)) {
614 err = PTR_ERR(rt);
615 rt = NULL;
616 goto done;
617 }
618
619 err = -EACCES;
620 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
621 goto done;
622
623 if (msg->msg_flags & MSG_CONFIRM)
624 goto do_confirm;
625 back_from_confirm:
626
627 if (inet->hdrincl)
628 err = raw_send_hdrinc(sk, &fl4, msg, len,
629 &rt, msg->msg_flags);
630
631 else {
632 sock_tx_timestamp(sk, &ipc.tx_flags);
633
634 if (!ipc.addr)
635 ipc.addr = fl4.daddr;
636 lock_sock(sk);
637 err = ip_append_data(sk, &fl4, raw_getfrag,
638 &rfv, len, 0,
639 &ipc, &rt, msg->msg_flags);
640 if (err)
641 ip_flush_pending_frames(sk);
642 else if (!(msg->msg_flags & MSG_MORE)) {
643 err = ip_push_pending_frames(sk, &fl4);
644 if (err == -ENOBUFS && !inet->recverr)
645 err = 0;
646 }
647 release_sock(sk);
648 }
649 done:
650 if (free)
651 kfree(ipc.opt);
652 ip_rt_put(rt);
653
654 out:
655 if (err < 0)
656 return err;
657 return len;
658
659 do_confirm:
660 dst_confirm(&rt->dst);
661 if (!(msg->msg_flags & MSG_PROBE) || len)
662 goto back_from_confirm;
663 err = 0;
664 goto done;
665 }
666
667 static void raw_close(struct sock *sk, long timeout)
668 {
669 /*
670 * Raw sockets may have direct kernel references. Kill them.
671 */
672 ip_ra_control(sk, 0, NULL);
673
674 sk_common_release(sk);
675 }
676
677 static void raw_destroy(struct sock *sk)
678 {
679 lock_sock(sk);
680 ip_flush_pending_frames(sk);
681 release_sock(sk);
682 }
683
684 /* This gets rid of all the nasties in af_inet. -DaveM */
685 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
686 {
687 struct inet_sock *inet = inet_sk(sk);
688 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
689 int ret = -EINVAL;
690 int chk_addr_ret;
691
692 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
693 goto out;
694 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
695 ret = -EADDRNOTAVAIL;
696 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
697 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
698 goto out;
699 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
700 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
701 inet->inet_saddr = 0; /* Use device */
702 sk_dst_reset(sk);
703 ret = 0;
704 out: return ret;
705 }
706
707 /*
708 * This should be easy, if there is something there
709 * we return it, otherwise we block.
710 */
711
712 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
713 int noblock, int flags, int *addr_len)
714 {
715 struct inet_sock *inet = inet_sk(sk);
716 size_t copied = 0;
717 int err = -EOPNOTSUPP;
718 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
719 struct sk_buff *skb;
720
721 if (flags & MSG_OOB)
722 goto out;
723
724 if (flags & MSG_ERRQUEUE) {
725 err = ip_recv_error(sk, msg, len, addr_len);
726 goto out;
727 }
728
729 skb = skb_recv_datagram(sk, flags, noblock, &err);
730 if (!skb)
731 goto out;
732
733 copied = skb->len;
734 if (len < copied) {
735 msg->msg_flags |= MSG_TRUNC;
736 copied = len;
737 }
738
739 err = skb_copy_datagram_msg(skb, 0, msg, copied);
740 if (err)
741 goto done;
742
743 sock_recv_ts_and_drops(msg, sk, skb);
744
745 /* Copy the address. */
746 if (sin) {
747 sin->sin_family = AF_INET;
748 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
749 sin->sin_port = 0;
750 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
751 *addr_len = sizeof(*sin);
752 }
753 if (inet->cmsg_flags)
754 ip_cmsg_recv(msg, skb);
755 if (flags & MSG_TRUNC)
756 copied = skb->len;
757 done:
758 skb_free_datagram(sk, skb);
759 out:
760 if (err)
761 return err;
762 return copied;
763 }
764
765 static int raw_init(struct sock *sk)
766 {
767 struct raw_sock *rp = raw_sk(sk);
768
769 if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
770 memset(&rp->filter, 0, sizeof(rp->filter));
771 return 0;
772 }
773
774 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
775 {
776 if (optlen > sizeof(struct icmp_filter))
777 optlen = sizeof(struct icmp_filter);
778 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
779 return -EFAULT;
780 return 0;
781 }
782
783 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
784 {
785 int len, ret = -EFAULT;
786
787 if (get_user(len, optlen))
788 goto out;
789 ret = -EINVAL;
790 if (len < 0)
791 goto out;
792 if (len > sizeof(struct icmp_filter))
793 len = sizeof(struct icmp_filter);
794 ret = -EFAULT;
795 if (put_user(len, optlen) ||
796 copy_to_user(optval, &raw_sk(sk)->filter, len))
797 goto out;
798 ret = 0;
799 out: return ret;
800 }
801
802 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
803 char __user *optval, unsigned int optlen)
804 {
805 if (optname == ICMP_FILTER) {
806 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
807 return -EOPNOTSUPP;
808 else
809 return raw_seticmpfilter(sk, optval, optlen);
810 }
811 return -ENOPROTOOPT;
812 }
813
814 static int raw_setsockopt(struct sock *sk, int level, int optname,
815 char __user *optval, unsigned int optlen)
816 {
817 if (level != SOL_RAW)
818 return ip_setsockopt(sk, level, optname, optval, optlen);
819 return do_raw_setsockopt(sk, level, optname, optval, optlen);
820 }
821
822 #ifdef CONFIG_COMPAT
823 static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
824 char __user *optval, unsigned int optlen)
825 {
826 if (level != SOL_RAW)
827 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
828 return do_raw_setsockopt(sk, level, optname, optval, optlen);
829 }
830 #endif
831
832 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
833 char __user *optval, int __user *optlen)
834 {
835 if (optname == ICMP_FILTER) {
836 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
837 return -EOPNOTSUPP;
838 else
839 return raw_geticmpfilter(sk, optval, optlen);
840 }
841 return -ENOPROTOOPT;
842 }
843
844 static int raw_getsockopt(struct sock *sk, int level, int optname,
845 char __user *optval, int __user *optlen)
846 {
847 if (level != SOL_RAW)
848 return ip_getsockopt(sk, level, optname, optval, optlen);
849 return do_raw_getsockopt(sk, level, optname, optval, optlen);
850 }
851
852 #ifdef CONFIG_COMPAT
853 static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
854 char __user *optval, int __user *optlen)
855 {
856 if (level != SOL_RAW)
857 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
858 return do_raw_getsockopt(sk, level, optname, optval, optlen);
859 }
860 #endif
861
862 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
863 {
864 switch (cmd) {
865 case SIOCOUTQ: {
866 int amount = sk_wmem_alloc_get(sk);
867
868 return put_user(amount, (int __user *)arg);
869 }
870 case SIOCINQ: {
871 struct sk_buff *skb;
872 int amount = 0;
873
874 spin_lock_bh(&sk->sk_receive_queue.lock);
875 skb = skb_peek(&sk->sk_receive_queue);
876 if (skb)
877 amount = skb->len;
878 spin_unlock_bh(&sk->sk_receive_queue.lock);
879 return put_user(amount, (int __user *)arg);
880 }
881
882 default:
883 #ifdef CONFIG_IP_MROUTE
884 return ipmr_ioctl(sk, cmd, (void __user *)arg);
885 #else
886 return -ENOIOCTLCMD;
887 #endif
888 }
889 }
890
891 #ifdef CONFIG_COMPAT
892 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
893 {
894 switch (cmd) {
895 case SIOCOUTQ:
896 case SIOCINQ:
897 return -ENOIOCTLCMD;
898 default:
899 #ifdef CONFIG_IP_MROUTE
900 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
901 #else
902 return -ENOIOCTLCMD;
903 #endif
904 }
905 }
906 #endif
907
908 struct proto raw_prot = {
909 .name = "RAW",
910 .owner = THIS_MODULE,
911 .close = raw_close,
912 .destroy = raw_destroy,
913 .connect = ip4_datagram_connect,
914 .disconnect = udp_disconnect,
915 .ioctl = raw_ioctl,
916 .init = raw_init,
917 .setsockopt = raw_setsockopt,
918 .getsockopt = raw_getsockopt,
919 .sendmsg = raw_sendmsg,
920 .recvmsg = raw_recvmsg,
921 .bind = raw_bind,
922 .backlog_rcv = raw_rcv_skb,
923 .release_cb = ip4_datagram_release_cb,
924 .hash = raw_hash_sk,
925 .unhash = raw_unhash_sk,
926 .obj_size = sizeof(struct raw_sock),
927 .h.raw_hash = &raw_v4_hashinfo,
928 #ifdef CONFIG_COMPAT
929 .compat_setsockopt = compat_raw_setsockopt,
930 .compat_getsockopt = compat_raw_getsockopt,
931 .compat_ioctl = compat_raw_ioctl,
932 #endif
933 };
934
935 #ifdef CONFIG_PROC_FS
936 static struct sock *raw_get_first(struct seq_file *seq)
937 {
938 struct sock *sk;
939 struct raw_iter_state *state = raw_seq_private(seq);
940
941 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
942 ++state->bucket) {
943 sk_for_each(sk, &state->h->ht[state->bucket])
944 if (sock_net(sk) == seq_file_net(seq))
945 goto found;
946 }
947 sk = NULL;
948 found:
949 return sk;
950 }
951
952 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
953 {
954 struct raw_iter_state *state = raw_seq_private(seq);
955
956 do {
957 sk = sk_next(sk);
958 try_again:
959 ;
960 } while (sk && sock_net(sk) != seq_file_net(seq));
961
962 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
963 sk = sk_head(&state->h->ht[state->bucket]);
964 goto try_again;
965 }
966 return sk;
967 }
968
969 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
970 {
971 struct sock *sk = raw_get_first(seq);
972
973 if (sk)
974 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
975 --pos;
976 return pos ? NULL : sk;
977 }
978
979 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
980 {
981 struct raw_iter_state *state = raw_seq_private(seq);
982
983 read_lock(&state->h->lock);
984 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
985 }
986 EXPORT_SYMBOL_GPL(raw_seq_start);
987
988 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
989 {
990 struct sock *sk;
991
992 if (v == SEQ_START_TOKEN)
993 sk = raw_get_first(seq);
994 else
995 sk = raw_get_next(seq, v);
996 ++*pos;
997 return sk;
998 }
999 EXPORT_SYMBOL_GPL(raw_seq_next);
1000
1001 void raw_seq_stop(struct seq_file *seq, void *v)
1002 {
1003 struct raw_iter_state *state = raw_seq_private(seq);
1004
1005 read_unlock(&state->h->lock);
1006 }
1007 EXPORT_SYMBOL_GPL(raw_seq_stop);
1008
1009 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1010 {
1011 struct inet_sock *inet = inet_sk(sp);
1012 __be32 dest = inet->inet_daddr,
1013 src = inet->inet_rcv_saddr;
1014 __u16 destp = 0,
1015 srcp = inet->inet_num;
1016
1017 seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
1018 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
1019 i, src, srcp, dest, destp, sp->sk_state,
1020 sk_wmem_alloc_get(sp),
1021 sk_rmem_alloc_get(sp),
1022 0, 0L, 0,
1023 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1024 0, sock_i_ino(sp),
1025 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1026 }
1027
1028 static int raw_seq_show(struct seq_file *seq, void *v)
1029 {
1030 if (v == SEQ_START_TOKEN)
1031 seq_printf(seq, " sl local_address rem_address st tx_queue "
1032 "rx_queue tr tm->when retrnsmt uid timeout "
1033 "inode ref pointer drops\n");
1034 else
1035 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1036 return 0;
1037 }
1038
1039 static const struct seq_operations raw_seq_ops = {
1040 .start = raw_seq_start,
1041 .next = raw_seq_next,
1042 .stop = raw_seq_stop,
1043 .show = raw_seq_show,
1044 };
1045
1046 int raw_seq_open(struct inode *ino, struct file *file,
1047 struct raw_hashinfo *h, const struct seq_operations *ops)
1048 {
1049 int err;
1050 struct raw_iter_state *i;
1051
1052 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
1053 if (err < 0)
1054 return err;
1055
1056 i = raw_seq_private((struct seq_file *)file->private_data);
1057 i->h = h;
1058 return 0;
1059 }
1060 EXPORT_SYMBOL_GPL(raw_seq_open);
1061
1062 static int raw_v4_seq_open(struct inode *inode, struct file *file)
1063 {
1064 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
1065 }
1066
1067 static const struct file_operations raw_seq_fops = {
1068 .owner = THIS_MODULE,
1069 .open = raw_v4_seq_open,
1070 .read = seq_read,
1071 .llseek = seq_lseek,
1072 .release = seq_release_net,
1073 };
1074
1075 static __net_init int raw_init_net(struct net *net)
1076 {
1077 if (!proc_create("raw", S_IRUGO, net->proc_net, &raw_seq_fops))
1078 return -ENOMEM;
1079
1080 return 0;
1081 }
1082
1083 static __net_exit void raw_exit_net(struct net *net)
1084 {
1085 remove_proc_entry("raw", net->proc_net);
1086 }
1087
1088 static __net_initdata struct pernet_operations raw_net_ops = {
1089 .init = raw_init_net,
1090 .exit = raw_exit_net,
1091 };
1092
1093 int __init raw_proc_init(void)
1094 {
1095 return register_pernet_subsys(&raw_net_ops);
1096 }
1097
1098 void __init raw_proc_exit(void)
1099 {
1100 unregister_pernet_subsys(&raw_net_ops);
1101 }
1102 #endif /* CONFIG_PROC_FS */
Linux with added FPC-III support