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powerpc/powernv: Report size of OPAL memcons log
[linux/fpc-iii.git] / net / ipv4 / raw.c
blob4e49e5cb001ccd6824104af273bcbc40fc864ef7
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 <linux/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 struct raw_hashinfo raw_v4_hashinfo = {
93 .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock),
94 };
95 EXPORT_SYMBOL_GPL(raw_v4_hashinfo);
96
97 int raw_hash_sk(struct sock *sk)
98 {
99 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
100 struct hlist_head *head;
101
102 head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)];
103
104 write_lock_bh(&h->lock);
105 sk_add_node(sk, head);
106 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
107 write_unlock_bh(&h->lock);
108
109 return 0;
110 }
111 EXPORT_SYMBOL_GPL(raw_hash_sk);
112
113 void raw_unhash_sk(struct sock *sk)
114 {
115 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
116
117 write_lock_bh(&h->lock);
118 if (sk_del_node_init(sk))
119 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
120 write_unlock_bh(&h->lock);
121 }
122 EXPORT_SYMBOL_GPL(raw_unhash_sk);
123
124 struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
125 unsigned short num, __be32 raddr, __be32 laddr, int dif)
126 {
127 sk_for_each_from(sk) {
128 struct inet_sock *inet = inet_sk(sk);
129
130 if (net_eq(sock_net(sk), net) && inet->inet_num == num &&
131 !(inet->inet_daddr && inet->inet_daddr != raddr) &&
132 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
133 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
134 goto found; /* gotcha */
135 }
136 sk = NULL;
137 found:
138 return sk;
139 }
140 EXPORT_SYMBOL_GPL(__raw_v4_lookup);
141
142 /*
143 * 0 - deliver
144 * 1 - block
145 */
146 static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
147 {
148 struct icmphdr _hdr;
149 const struct icmphdr *hdr;
150
151 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
152 sizeof(_hdr), &_hdr);
153 if (!hdr)
154 return 1;
155
156 if (hdr->type < 32) {
157 __u32 data = raw_sk(sk)->filter.data;
158
159 return ((1U << hdr->type) & data) != 0;
160 }
161
162 /* Do not block unknown ICMP types */
163 return 0;
164 }
165
166 /* IP input processing comes here for RAW socket delivery.
167 * Caller owns SKB, so we must make clones.
168 *
169 * RFC 1122: SHOULD pass TOS value up to the transport layer.
170 * -> It does. And not only TOS, but all IP header.
171 */
172 static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
173 {
174 struct sock *sk;
175 struct hlist_head *head;
176 int delivered = 0;
177 struct net *net;
178
179 read_lock(&raw_v4_hashinfo.lock);
180 head = &raw_v4_hashinfo.ht[hash];
181 if (hlist_empty(head))
182 goto out;
183
184 net = dev_net(skb->dev);
185 sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
186 iph->saddr, iph->daddr,
187 skb->dev->ifindex);
188
189 while (sk) {
190 delivered = 1;
191 if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
192 ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
193 skb->dev->ifindex)) {
194 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
195
196 /* Not releasing hash table! */
197 if (clone)
198 raw_rcv(sk, clone);
199 }
200 sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
201 iph->saddr, iph->daddr,
202 skb->dev->ifindex);
203 }
204 out:
205 read_unlock(&raw_v4_hashinfo.lock);
206 return delivered;
207 }
208
209 int raw_local_deliver(struct sk_buff *skb, int protocol)
210 {
211 int hash;
212 struct sock *raw_sk;
213
214 hash = protocol & (RAW_HTABLE_SIZE - 1);
215 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
216
217 /* If there maybe a raw socket we must check - if not we
218 * don't care less
219 */
220 if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
221 raw_sk = NULL;
222
223 return raw_sk != NULL;
224
225 }
226
227 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
228 {
229 struct inet_sock *inet = inet_sk(sk);
230 const int type = icmp_hdr(skb)->type;
231 const int code = icmp_hdr(skb)->code;
232 int err = 0;
233 int harderr = 0;
234
235 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
236 ipv4_sk_update_pmtu(skb, sk, info);
237 else if (type == ICMP_REDIRECT) {
238 ipv4_sk_redirect(skb, sk);
239 return;
240 }
241
242 /* Report error on raw socket, if:
243 1. User requested ip_recverr.
244 2. Socket is connected (otherwise the error indication
245 is useless without ip_recverr and error is hard.
246 */
247 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
248 return;
249
250 switch (type) {
251 default:
252 case ICMP_TIME_EXCEEDED:
253 err = EHOSTUNREACH;
254 break;
255 case ICMP_SOURCE_QUENCH:
256 return;
257 case ICMP_PARAMETERPROB:
258 err = EPROTO;
259 harderr = 1;
260 break;
261 case ICMP_DEST_UNREACH:
262 err = EHOSTUNREACH;
263 if (code > NR_ICMP_UNREACH)
264 break;
265 err = icmp_err_convert[code].errno;
266 harderr = icmp_err_convert[code].fatal;
267 if (code == ICMP_FRAG_NEEDED) {
268 harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
269 err = EMSGSIZE;
270 }
271 }
272
273 if (inet->recverr) {
274 const struct iphdr *iph = (const struct iphdr *)skb->data;
275 u8 *payload = skb->data + (iph->ihl << 2);
276
277 if (inet->hdrincl)
278 payload = skb->data;
279 ip_icmp_error(sk, skb, err, 0, info, payload);
280 }
281
282 if (inet->recverr || harderr) {
283 sk->sk_err = err;
284 sk->sk_error_report(sk);
285 }
286 }
287
288 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
289 {
290 int hash;
291 struct sock *raw_sk;
292 const struct iphdr *iph;
293 struct net *net;
294
295 hash = protocol & (RAW_HTABLE_SIZE - 1);
296
297 read_lock(&raw_v4_hashinfo.lock);
298 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
299 if (raw_sk) {
300 iph = (const struct iphdr *)skb->data;
301 net = dev_net(skb->dev);
302
303 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
304 iph->daddr, iph->saddr,
305 skb->dev->ifindex)) != NULL) {
306 raw_err(raw_sk, skb, info);
307 raw_sk = sk_next(raw_sk);
308 iph = (const struct iphdr *)skb->data;
309 }
310 }
311 read_unlock(&raw_v4_hashinfo.lock);
312 }
313
314 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
315 {
316 /* Charge it to the socket. */
317
318 ipv4_pktinfo_prepare(sk, skb);
319 if (sock_queue_rcv_skb(sk, skb) < 0) {
320 kfree_skb(skb);
321 return NET_RX_DROP;
322 }
323
324 return NET_RX_SUCCESS;
325 }
326
327 int raw_rcv(struct sock *sk, struct sk_buff *skb)
328 {
329 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
330 atomic_inc(&sk->sk_drops);
331 kfree_skb(skb);
332 return NET_RX_DROP;
333 }
334 nf_reset(skb);
335
336 skb_push(skb, skb->data - skb_network_header(skb));
337
338 raw_rcv_skb(sk, skb);
339 return 0;
340 }
341
342 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
343 struct msghdr *msg, size_t length,
344 struct rtable **rtp, unsigned int flags,
345 const struct sockcm_cookie *sockc)
346 {
347 struct inet_sock *inet = inet_sk(sk);
348 struct net *net = sock_net(sk);
349 struct iphdr *iph;
350 struct sk_buff *skb;
351 unsigned int iphlen;
352 int err;
353 struct rtable *rt = *rtp;
354 int hlen, tlen;
355
356 if (length > rt->dst.dev->mtu) {
357 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
358 rt->dst.dev->mtu);
359 return -EMSGSIZE;
360 }
361 if (flags&MSG_PROBE)
362 goto out;
363
364 hlen = LL_RESERVED_SPACE(rt->dst.dev);
365 tlen = rt->dst.dev->needed_tailroom;
366 skb = sock_alloc_send_skb(sk,
367 length + hlen + tlen + 15,
368 flags & MSG_DONTWAIT, &err);
369 if (!skb)
370 goto error;
371 skb_reserve(skb, hlen);
372
373 skb->priority = sk->sk_priority;
374 skb->mark = sk->sk_mark;
375 skb_dst_set(skb, &rt->dst);
376 *rtp = NULL;
377
378 skb_reset_network_header(skb);
379 iph = ip_hdr(skb);
380 skb_put(skb, length);
381
382 skb->ip_summed = CHECKSUM_NONE;
383
384 sock_tx_timestamp(sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
385
386 skb->transport_header = skb->network_header;
387 err = -EFAULT;
388 if (memcpy_from_msg(iph, msg, length))
389 goto error_free;
390
391 iphlen = iph->ihl * 4;
392
393 /*
394 * We don't want to modify the ip header, but we do need to
395 * be sure that it won't cause problems later along the network
396 * stack. Specifically we want to make sure that iph->ihl is a
397 * sane value. If ihl points beyond the length of the buffer passed
398 * in, reject the frame as invalid
399 */
400 err = -EINVAL;
401 if (iphlen > length)
402 goto error_free;
403
404 if (iphlen >= sizeof(*iph)) {
405 if (!iph->saddr)
406 iph->saddr = fl4->saddr;
407 iph->check = 0;
408 iph->tot_len = htons(length);
409 if (!iph->id)
410 ip_select_ident(net, skb, NULL);
411
412 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
413 skb->transport_header += iphlen;
414 if (iph->protocol == IPPROTO_ICMP &&
415 length >= iphlen + sizeof(struct icmphdr))
416 icmp_out_count(net, ((struct icmphdr *)
417 skb_transport_header(skb))->type);
418 }
419
420 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
421 net, sk, skb, NULL, rt->dst.dev,
422 dst_output);
423 if (err > 0)
424 err = net_xmit_errno(err);
425 if (err)
426 goto error;
427 out:
428 return 0;
429
430 error_free:
431 kfree_skb(skb);
432 error:
433 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
434 if (err == -ENOBUFS && !inet->recverr)
435 err = 0;
436 return err;
437 }
438
439 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4)
440 {
441 int err;
442
443 if (fl4->flowi4_proto != IPPROTO_ICMP)
444 return 0;
445
446 /* We only need the first two bytes. */
447 rfv->hlen = 2;
448
449 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
450 if (err)
451 return err;
452
453 fl4->fl4_icmp_type = rfv->hdr.icmph.type;
454 fl4->fl4_icmp_code = rfv->hdr.icmph.code;
455
456 return 0;
457 }
458
459 static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
460 struct sk_buff *skb)
461 {
462 struct raw_frag_vec *rfv = from;
463
464 if (offset < rfv->hlen) {
465 int copy = min(rfv->hlen - offset, len);
466
467 if (skb->ip_summed == CHECKSUM_PARTIAL)
468 memcpy(to, rfv->hdr.c + offset, copy);
469 else
470 skb->csum = csum_block_add(
471 skb->csum,
472 csum_partial_copy_nocheck(rfv->hdr.c + offset,
473 to, copy, 0),
474 odd);
475
476 odd = 0;
477 offset += copy;
478 to += copy;
479 len -= copy;
480
481 if (!len)
482 return 0;
483 }
484
485 offset -= rfv->hlen;
486
487 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
488 }
489
490 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
491 {
492 struct inet_sock *inet = inet_sk(sk);
493 struct net *net = sock_net(sk);
494 struct ipcm_cookie ipc;
495 struct rtable *rt = NULL;
496 struct flowi4 fl4;
497 int free = 0;
498 __be32 daddr;
499 __be32 saddr;
500 u8 tos;
501 int err;
502 struct ip_options_data opt_copy;
503 struct raw_frag_vec rfv;
504
505 err = -EMSGSIZE;
506 if (len > 0xFFFF)
507 goto out;
508
509 /*
510 * Check the flags.
511 */
512
513 err = -EOPNOTSUPP;
514 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
515 goto out; /* compatibility */
516
517 /*
518 * Get and verify the address.
519 */
520
521 if (msg->msg_namelen) {
522 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
523 err = -EINVAL;
524 if (msg->msg_namelen < sizeof(*usin))
525 goto out;
526 if (usin->sin_family != AF_INET) {
527 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
528 __func__, current->comm);
529 err = -EAFNOSUPPORT;
530 if (usin->sin_family)
531 goto out;
532 }
533 daddr = usin->sin_addr.s_addr;
534 /* ANK: I did not forget to get protocol from port field.
535 * I just do not know, who uses this weirdness.
536 * IP_HDRINCL is much more convenient.
537 */
538 } else {
539 err = -EDESTADDRREQ;
540 if (sk->sk_state != TCP_ESTABLISHED)
541 goto out;
542 daddr = inet->inet_daddr;
543 }
544
545 ipc.sockc.tsflags = sk->sk_tsflags;
546 ipc.addr = inet->inet_saddr;
547 ipc.opt = NULL;
548 ipc.tx_flags = 0;
549 ipc.ttl = 0;
550 ipc.tos = -1;
551 ipc.oif = sk->sk_bound_dev_if;
552
553 if (msg->msg_controllen) {
554 err = ip_cmsg_send(sk, msg, &ipc, false);
555 if (unlikely(err)) {
556 kfree(ipc.opt);
557 goto out;
558 }
559 if (ipc.opt)
560 free = 1;
561 }
562
563 saddr = ipc.addr;
564 ipc.addr = daddr;
565
566 if (!ipc.opt) {
567 struct ip_options_rcu *inet_opt;
568
569 rcu_read_lock();
570 inet_opt = rcu_dereference(inet->inet_opt);
571 if (inet_opt) {
572 memcpy(&opt_copy, inet_opt,
573 sizeof(*inet_opt) + inet_opt->opt.optlen);
574 ipc.opt = &opt_copy.opt;
575 }
576 rcu_read_unlock();
577 }
578
579 if (ipc.opt) {
580 err = -EINVAL;
581 /* Linux does not mangle headers on raw sockets,
582 * so that IP options + IP_HDRINCL is non-sense.
583 */
584 if (inet->hdrincl)
585 goto done;
586 if (ipc.opt->opt.srr) {
587 if (!daddr)
588 goto done;
589 daddr = ipc.opt->opt.faddr;
590 }
591 }
592 tos = get_rtconn_flags(&ipc, sk);
593 if (msg->msg_flags & MSG_DONTROUTE)
594 tos |= RTO_ONLINK;
595
596 if (ipv4_is_multicast(daddr)) {
597 if (!ipc.oif)
598 ipc.oif = inet->mc_index;
599 if (!saddr)
600 saddr = inet->mc_addr;
601 } else if (!ipc.oif)
602 ipc.oif = inet->uc_index;
603
604 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
605 RT_SCOPE_UNIVERSE,
606 inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
607 inet_sk_flowi_flags(sk) |
608 (inet->hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
609 daddr, saddr, 0, 0, sk->sk_uid);
610
611 if (!inet->hdrincl) {
612 rfv.msg = msg;
613 rfv.hlen = 0;
614
615 err = raw_probe_proto_opt(&rfv, &fl4);
616 if (err)
617 goto done;
618 }
619
620 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
621 rt = ip_route_output_flow(net, &fl4, sk);
622 if (IS_ERR(rt)) {
623 err = PTR_ERR(rt);
624 rt = NULL;
625 goto done;
626 }
627
628 err = -EACCES;
629 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
630 goto done;
631
632 if (msg->msg_flags & MSG_CONFIRM)
633 goto do_confirm;
634 back_from_confirm:
635
636 if (inet->hdrincl)
637 err = raw_send_hdrinc(sk, &fl4, msg, len,
638 &rt, msg->msg_flags, &ipc.sockc);
639
640 else {
641 sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags);
642
643 if (!ipc.addr)
644 ipc.addr = fl4.daddr;
645 lock_sock(sk);
646 err = ip_append_data(sk, &fl4, raw_getfrag,
647 &rfv, len, 0,
648 &ipc, &rt, msg->msg_flags);
649 if (err)
650 ip_flush_pending_frames(sk);
651 else if (!(msg->msg_flags & MSG_MORE)) {
652 err = ip_push_pending_frames(sk, &fl4);
653 if (err == -ENOBUFS && !inet->recverr)
654 err = 0;
655 }
656 release_sock(sk);
657 }
658 done:
659 if (free)
660 kfree(ipc.opt);
661 ip_rt_put(rt);
662
663 out:
664 if (err < 0)
665 return err;
666 return len;
667
668 do_confirm:
669 dst_confirm(&rt->dst);
670 if (!(msg->msg_flags & MSG_PROBE) || len)
671 goto back_from_confirm;
672 err = 0;
673 goto done;
674 }
675
676 static void raw_close(struct sock *sk, long timeout)
677 {
678 /*
679 * Raw sockets may have direct kernel references. Kill them.
680 */
681 ip_ra_control(sk, 0, NULL);
682
683 sk_common_release(sk);
684 }
685
686 static void raw_destroy(struct sock *sk)
687 {
688 lock_sock(sk);
689 ip_flush_pending_frames(sk);
690 release_sock(sk);
691 }
692
693 /* This gets rid of all the nasties in af_inet. -DaveM */
694 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
695 {
696 struct inet_sock *inet = inet_sk(sk);
697 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
698 u32 tb_id = RT_TABLE_LOCAL;
699 int ret = -EINVAL;
700 int chk_addr_ret;
701
702 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
703 goto out;
704
705 if (sk->sk_bound_dev_if)
706 tb_id = l3mdev_fib_table_by_index(sock_net(sk),
707 sk->sk_bound_dev_if) ? : tb_id;
708
709 chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr,
710 tb_id);
711
712 ret = -EADDRNOTAVAIL;
713 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
714 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
715 goto out;
716 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
717 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
718 inet->inet_saddr = 0; /* Use device */
719 sk_dst_reset(sk);
720 ret = 0;
721 out: return ret;
722 }
723
724 /*
725 * This should be easy, if there is something there
726 * we return it, otherwise we block.
727 */
728
729 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
730 int noblock, int flags, int *addr_len)
731 {
732 struct inet_sock *inet = inet_sk(sk);
733 size_t copied = 0;
734 int err = -EOPNOTSUPP;
735 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
736 struct sk_buff *skb;
737
738 if (flags & MSG_OOB)
739 goto out;
740
741 if (flags & MSG_ERRQUEUE) {
742 err = ip_recv_error(sk, msg, len, addr_len);
743 goto out;
744 }
745
746 skb = skb_recv_datagram(sk, flags, noblock, &err);
747 if (!skb)
748 goto out;
749
750 copied = skb->len;
751 if (len < copied) {
752 msg->msg_flags |= MSG_TRUNC;
753 copied = len;
754 }
755
756 err = skb_copy_datagram_msg(skb, 0, msg, copied);
757 if (err)
758 goto done;
759
760 sock_recv_ts_and_drops(msg, sk, skb);
761
762 /* Copy the address. */
763 if (sin) {
764 sin->sin_family = AF_INET;
765 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
766 sin->sin_port = 0;
767 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
768 *addr_len = sizeof(*sin);
769 }
770 if (inet->cmsg_flags)
771 ip_cmsg_recv(msg, skb);
772 if (flags & MSG_TRUNC)
773 copied = skb->len;
774 done:
775 skb_free_datagram(sk, skb);
776 out:
777 if (err)
778 return err;
779 return copied;
780 }
781
782 static int raw_init(struct sock *sk)
783 {
784 struct raw_sock *rp = raw_sk(sk);
785
786 if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
787 memset(&rp->filter, 0, sizeof(rp->filter));
788 return 0;
789 }
790
791 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
792 {
793 if (optlen > sizeof(struct icmp_filter))
794 optlen = sizeof(struct icmp_filter);
795 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
796 return -EFAULT;
797 return 0;
798 }
799
800 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
801 {
802 int len, ret = -EFAULT;
803
804 if (get_user(len, optlen))
805 goto out;
806 ret = -EINVAL;
807 if (len < 0)
808 goto out;
809 if (len > sizeof(struct icmp_filter))
810 len = sizeof(struct icmp_filter);
811 ret = -EFAULT;
812 if (put_user(len, optlen) ||
813 copy_to_user(optval, &raw_sk(sk)->filter, len))
814 goto out;
815 ret = 0;
816 out: return ret;
817 }
818
819 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
820 char __user *optval, unsigned int optlen)
821 {
822 if (optname == ICMP_FILTER) {
823 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
824 return -EOPNOTSUPP;
825 else
826 return raw_seticmpfilter(sk, optval, optlen);
827 }
828 return -ENOPROTOOPT;
829 }
830
831 static int raw_setsockopt(struct sock *sk, int level, int optname,
832 char __user *optval, unsigned int optlen)
833 {
834 if (level != SOL_RAW)
835 return ip_setsockopt(sk, level, optname, optval, optlen);
836 return do_raw_setsockopt(sk, level, optname, optval, optlen);
837 }
838
839 #ifdef CONFIG_COMPAT
840 static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
841 char __user *optval, unsigned int optlen)
842 {
843 if (level != SOL_RAW)
844 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
845 return do_raw_setsockopt(sk, level, optname, optval, optlen);
846 }
847 #endif
848
849 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
850 char __user *optval, int __user *optlen)
851 {
852 if (optname == ICMP_FILTER) {
853 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
854 return -EOPNOTSUPP;
855 else
856 return raw_geticmpfilter(sk, optval, optlen);
857 }
858 return -ENOPROTOOPT;
859 }
860
861 static int raw_getsockopt(struct sock *sk, int level, int optname,
862 char __user *optval, int __user *optlen)
863 {
864 if (level != SOL_RAW)
865 return ip_getsockopt(sk, level, optname, optval, optlen);
866 return do_raw_getsockopt(sk, level, optname, optval, optlen);
867 }
868
869 #ifdef CONFIG_COMPAT
870 static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
871 char __user *optval, int __user *optlen)
872 {
873 if (level != SOL_RAW)
874 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
875 return do_raw_getsockopt(sk, level, optname, optval, optlen);
876 }
877 #endif
878
879 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
880 {
881 switch (cmd) {
882 case SIOCOUTQ: {
883 int amount = sk_wmem_alloc_get(sk);
884
885 return put_user(amount, (int __user *)arg);
886 }
887 case SIOCINQ: {
888 struct sk_buff *skb;
889 int amount = 0;
890
891 spin_lock_bh(&sk->sk_receive_queue.lock);
892 skb = skb_peek(&sk->sk_receive_queue);
893 if (skb)
894 amount = skb->len;
895 spin_unlock_bh(&sk->sk_receive_queue.lock);
896 return put_user(amount, (int __user *)arg);
897 }
898
899 default:
900 #ifdef CONFIG_IP_MROUTE
901 return ipmr_ioctl(sk, cmd, (void __user *)arg);
902 #else
903 return -ENOIOCTLCMD;
904 #endif
905 }
906 }
907
908 #ifdef CONFIG_COMPAT
909 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
910 {
911 switch (cmd) {
912 case SIOCOUTQ:
913 case SIOCINQ:
914 return -ENOIOCTLCMD;
915 default:
916 #ifdef CONFIG_IP_MROUTE
917 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
918 #else
919 return -ENOIOCTLCMD;
920 #endif
921 }
922 }
923 #endif
924
925 int raw_abort(struct sock *sk, int err)
926 {
927 lock_sock(sk);
928
929 sk->sk_err = err;
930 sk->sk_error_report(sk);
931 __udp_disconnect(sk, 0);
932
933 release_sock(sk);
934
935 return 0;
936 }
937 EXPORT_SYMBOL_GPL(raw_abort);
938
939 struct proto raw_prot = {
940 .name = "RAW",
941 .owner = THIS_MODULE,
942 .close = raw_close,
943 .destroy = raw_destroy,
944 .connect = ip4_datagram_connect,
945 .disconnect = __udp_disconnect,
946 .ioctl = raw_ioctl,
947 .init = raw_init,
948 .setsockopt = raw_setsockopt,
949 .getsockopt = raw_getsockopt,
950 .sendmsg = raw_sendmsg,
951 .recvmsg = raw_recvmsg,
952 .bind = raw_bind,
953 .backlog_rcv = raw_rcv_skb,
954 .release_cb = ip4_datagram_release_cb,
955 .hash = raw_hash_sk,
956 .unhash = raw_unhash_sk,
957 .obj_size = sizeof(struct raw_sock),
958 .h.raw_hash = &raw_v4_hashinfo,
959 #ifdef CONFIG_COMPAT
960 .compat_setsockopt = compat_raw_setsockopt,
961 .compat_getsockopt = compat_raw_getsockopt,
962 .compat_ioctl = compat_raw_ioctl,
963 #endif
964 .diag_destroy = raw_abort,
965 };
966
967 #ifdef CONFIG_PROC_FS
968 static struct sock *raw_get_first(struct seq_file *seq)
969 {
970 struct sock *sk;
971 struct raw_iter_state *state = raw_seq_private(seq);
972
973 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
974 ++state->bucket) {
975 sk_for_each(sk, &state->h->ht[state->bucket])
976 if (sock_net(sk) == seq_file_net(seq))
977 goto found;
978 }
979 sk = NULL;
980 found:
981 return sk;
982 }
983
984 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
985 {
986 struct raw_iter_state *state = raw_seq_private(seq);
987
988 do {
989 sk = sk_next(sk);
990 try_again:
991 ;
992 } while (sk && sock_net(sk) != seq_file_net(seq));
993
994 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
995 sk = sk_head(&state->h->ht[state->bucket]);
996 goto try_again;
997 }
998 return sk;
999 }
1000
1001 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
1002 {
1003 struct sock *sk = raw_get_first(seq);
1004
1005 if (sk)
1006 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
1007 --pos;
1008 return pos ? NULL : sk;
1009 }
1010
1011 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
1012 {
1013 struct raw_iter_state *state = raw_seq_private(seq);
1014
1015 read_lock(&state->h->lock);
1016 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
1017 }
1018 EXPORT_SYMBOL_GPL(raw_seq_start);
1019
1020 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1021 {
1022 struct sock *sk;
1023
1024 if (v == SEQ_START_TOKEN)
1025 sk = raw_get_first(seq);
1026 else
1027 sk = raw_get_next(seq, v);
1028 ++*pos;
1029 return sk;
1030 }
1031 EXPORT_SYMBOL_GPL(raw_seq_next);
1032
1033 void raw_seq_stop(struct seq_file *seq, void *v)
1034 {
1035 struct raw_iter_state *state = raw_seq_private(seq);
1036
1037 read_unlock(&state->h->lock);
1038 }
1039 EXPORT_SYMBOL_GPL(raw_seq_stop);
1040
1041 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1042 {
1043 struct inet_sock *inet = inet_sk(sp);
1044 __be32 dest = inet->inet_daddr,
1045 src = inet->inet_rcv_saddr;
1046 __u16 destp = 0,
1047 srcp = inet->inet_num;
1048
1049 seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
1050 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
1051 i, src, srcp, dest, destp, sp->sk_state,
1052 sk_wmem_alloc_get(sp),
1053 sk_rmem_alloc_get(sp),
1054 0, 0L, 0,
1055 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1056 0, sock_i_ino(sp),
1057 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1058 }
1059
1060 static int raw_seq_show(struct seq_file *seq, void *v)
1061 {
1062 if (v == SEQ_START_TOKEN)
1063 seq_printf(seq, " sl local_address rem_address st tx_queue "
1064 "rx_queue tr tm->when retrnsmt uid timeout "
1065 "inode ref pointer drops\n");
1066 else
1067 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1068 return 0;
1069 }
1070
1071 static const struct seq_operations raw_seq_ops = {
1072 .start = raw_seq_start,
1073 .next = raw_seq_next,
1074 .stop = raw_seq_stop,
1075 .show = raw_seq_show,
1076 };
1077
1078 int raw_seq_open(struct inode *ino, struct file *file,
1079 struct raw_hashinfo *h, const struct seq_operations *ops)
1080 {
1081 int err;
1082 struct raw_iter_state *i;
1083
1084 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
1085 if (err < 0)
1086 return err;
1087
1088 i = raw_seq_private((struct seq_file *)file->private_data);
1089 i->h = h;
1090 return 0;
1091 }
1092 EXPORT_SYMBOL_GPL(raw_seq_open);
1093
1094 static int raw_v4_seq_open(struct inode *inode, struct file *file)
1095 {
1096 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
1097 }
1098
1099 static const struct file_operations raw_seq_fops = {
1100 .owner = THIS_MODULE,
1101 .open = raw_v4_seq_open,
1102 .read = seq_read,
1103 .llseek = seq_lseek,
1104 .release = seq_release_net,
1105 };
1106
1107 static __net_init int raw_init_net(struct net *net)
1108 {
1109 if (!proc_create("raw", S_IRUGO, net->proc_net, &raw_seq_fops))
1110 return -ENOMEM;
1111
1112 return 0;
1113 }
1114
1115 static __net_exit void raw_exit_net(struct net *net)
1116 {
1117 remove_proc_entry("raw", net->proc_net);
1118 }
1119
1120 static __net_initdata struct pernet_operations raw_net_ops = {
1121 .init = raw_init_net,
1122 .exit = raw_exit_net,
1123 };
1124
1125 int __init raw_proc_init(void)
1126 {
1127 return register_pernet_subsys(&raw_net_ops);
1128 }
1129
1130 void __init raw_proc_exit(void)
1131 {
1132 unregister_pernet_subsys(&raw_net_ops);
1133 }
1134 #endif /* CONFIG_PROC_FS */
Linux with added FPC-III support