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xtensa: support DMA buffers in high memory
[cris-mirror.git] / net / ipv4 / raw.c
blob9b367fc48d7dde553ae5972481d813c7d313ddb9
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,
126 int dif, int sdif)
127 {
128 sk_for_each_from(sk) {
129 struct inet_sock *inet = inet_sk(sk);
130
131 if (net_eq(sock_net(sk), net) && inet->inet_num == num &&
132 !(inet->inet_daddr && inet->inet_daddr != raddr) &&
133 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
134 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif &&
135 sk->sk_bound_dev_if != sdif))
136 goto found; /* gotcha */
137 }
138 sk = NULL;
139 found:
140 return sk;
141 }
142 EXPORT_SYMBOL_GPL(__raw_v4_lookup);
143
144 /*
145 * 0 - deliver
146 * 1 - block
147 */
148 static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
149 {
150 struct icmphdr _hdr;
151 const struct icmphdr *hdr;
152
153 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
154 sizeof(_hdr), &_hdr);
155 if (!hdr)
156 return 1;
157
158 if (hdr->type < 32) {
159 __u32 data = raw_sk(sk)->filter.data;
160
161 return ((1U << hdr->type) & data) != 0;
162 }
163
164 /* Do not block unknown ICMP types */
165 return 0;
166 }
167
168 /* IP input processing comes here for RAW socket delivery.
169 * Caller owns SKB, so we must make clones.
170 *
171 * RFC 1122: SHOULD pass TOS value up to the transport layer.
172 * -> It does. And not only TOS, but all IP header.
173 */
174 static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
175 {
176 int sdif = inet_sdif(skb);
177 struct sock *sk;
178 struct hlist_head *head;
179 int delivered = 0;
180 struct net *net;
181
182 read_lock(&raw_v4_hashinfo.lock);
183 head = &raw_v4_hashinfo.ht[hash];
184 if (hlist_empty(head))
185 goto out;
186
187 net = dev_net(skb->dev);
188 sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
189 iph->saddr, iph->daddr,
190 skb->dev->ifindex, sdif);
191
192 while (sk) {
193 delivered = 1;
194 if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
195 ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
196 skb->dev->ifindex, sdif)) {
197 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
198
199 /* Not releasing hash table! */
200 if (clone)
201 raw_rcv(sk, clone);
202 }
203 sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
204 iph->saddr, iph->daddr,
205 skb->dev->ifindex, sdif);
206 }
207 out:
208 read_unlock(&raw_v4_hashinfo.lock);
209 return delivered;
210 }
211
212 int raw_local_deliver(struct sk_buff *skb, int protocol)
213 {
214 int hash;
215 struct sock *raw_sk;
216
217 hash = protocol & (RAW_HTABLE_SIZE - 1);
218 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
219
220 /* If there maybe a raw socket we must check - if not we
221 * don't care less
222 */
223 if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
224 raw_sk = NULL;
225
226 return raw_sk != NULL;
227
228 }
229
230 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
231 {
232 struct inet_sock *inet = inet_sk(sk);
233 const int type = icmp_hdr(skb)->type;
234 const int code = icmp_hdr(skb)->code;
235 int err = 0;
236 int harderr = 0;
237
238 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
239 ipv4_sk_update_pmtu(skb, sk, info);
240 else if (type == ICMP_REDIRECT) {
241 ipv4_sk_redirect(skb, sk);
242 return;
243 }
244
245 /* Report error on raw socket, if:
246 1. User requested ip_recverr.
247 2. Socket is connected (otherwise the error indication
248 is useless without ip_recverr and error is hard.
249 */
250 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
251 return;
252
253 switch (type) {
254 default:
255 case ICMP_TIME_EXCEEDED:
256 err = EHOSTUNREACH;
257 break;
258 case ICMP_SOURCE_QUENCH:
259 return;
260 case ICMP_PARAMETERPROB:
261 err = EPROTO;
262 harderr = 1;
263 break;
264 case ICMP_DEST_UNREACH:
265 err = EHOSTUNREACH;
266 if (code > NR_ICMP_UNREACH)
267 break;
268 err = icmp_err_convert[code].errno;
269 harderr = icmp_err_convert[code].fatal;
270 if (code == ICMP_FRAG_NEEDED) {
271 harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
272 err = EMSGSIZE;
273 }
274 }
275
276 if (inet->recverr) {
277 const struct iphdr *iph = (const struct iphdr *)skb->data;
278 u8 *payload = skb->data + (iph->ihl << 2);
279
280 if (inet->hdrincl)
281 payload = skb->data;
282 ip_icmp_error(sk, skb, err, 0, info, payload);
283 }
284
285 if (inet->recverr || harderr) {
286 sk->sk_err = err;
287 sk->sk_error_report(sk);
288 }
289 }
290
291 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
292 {
293 int hash;
294 struct sock *raw_sk;
295 const struct iphdr *iph;
296 struct net *net;
297
298 hash = protocol & (RAW_HTABLE_SIZE - 1);
299
300 read_lock(&raw_v4_hashinfo.lock);
301 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
302 if (raw_sk) {
303 int dif = skb->dev->ifindex;
304 int sdif = inet_sdif(skb);
305
306 iph = (const struct iphdr *)skb->data;
307 net = dev_net(skb->dev);
308
309 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
310 iph->daddr, iph->saddr,
311 dif, sdif)) != NULL) {
312 raw_err(raw_sk, skb, info);
313 raw_sk = sk_next(raw_sk);
314 iph = (const struct iphdr *)skb->data;
315 }
316 }
317 read_unlock(&raw_v4_hashinfo.lock);
318 }
319
320 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
321 {
322 /* Charge it to the socket. */
323
324 ipv4_pktinfo_prepare(sk, skb);
325 if (sock_queue_rcv_skb(sk, skb) < 0) {
326 kfree_skb(skb);
327 return NET_RX_DROP;
328 }
329
330 return NET_RX_SUCCESS;
331 }
332
333 int raw_rcv(struct sock *sk, struct sk_buff *skb)
334 {
335 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
336 atomic_inc(&sk->sk_drops);
337 kfree_skb(skb);
338 return NET_RX_DROP;
339 }
340 nf_reset(skb);
341
342 skb_push(skb, skb->data - skb_network_header(skb));
343
344 raw_rcv_skb(sk, skb);
345 return 0;
346 }
347
348 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
349 struct msghdr *msg, size_t length,
350 struct rtable **rtp, unsigned int flags,
351 const struct sockcm_cookie *sockc)
352 {
353 struct inet_sock *inet = inet_sk(sk);
354 struct net *net = sock_net(sk);
355 struct iphdr *iph;
356 struct sk_buff *skb;
357 unsigned int iphlen;
358 int err;
359 struct rtable *rt = *rtp;
360 int hlen, tlen;
361
362 if (length > rt->dst.dev->mtu) {
363 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
364 rt->dst.dev->mtu);
365 return -EMSGSIZE;
366 }
367 if (length < sizeof(struct iphdr))
368 return -EINVAL;
369
370 if (flags&MSG_PROBE)
371 goto out;
372
373 hlen = LL_RESERVED_SPACE(rt->dst.dev);
374 tlen = rt->dst.dev->needed_tailroom;
375 skb = sock_alloc_send_skb(sk,
376 length + hlen + tlen + 15,
377 flags & MSG_DONTWAIT, &err);
378 if (!skb)
379 goto error;
380 skb_reserve(skb, hlen);
381
382 skb->priority = sk->sk_priority;
383 skb->mark = sk->sk_mark;
384 skb_dst_set(skb, &rt->dst);
385 *rtp = NULL;
386
387 skb_reset_network_header(skb);
388 iph = ip_hdr(skb);
389 skb_put(skb, length);
390
391 skb->ip_summed = CHECKSUM_NONE;
392
393 sock_tx_timestamp(sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
394
395 if (flags & MSG_CONFIRM)
396 skb_set_dst_pending_confirm(skb, 1);
397
398 skb->transport_header = skb->network_header;
399 err = -EFAULT;
400 if (memcpy_from_msg(iph, msg, length))
401 goto error_free;
402
403 iphlen = iph->ihl * 4;
404
405 /*
406 * We don't want to modify the ip header, but we do need to
407 * be sure that it won't cause problems later along the network
408 * stack. Specifically we want to make sure that iph->ihl is a
409 * sane value. If ihl points beyond the length of the buffer passed
410 * in, reject the frame as invalid
411 */
412 err = -EINVAL;
413 if (iphlen > length)
414 goto error_free;
415
416 if (iphlen >= sizeof(*iph)) {
417 if (!iph->saddr)
418 iph->saddr = fl4->saddr;
419 iph->check = 0;
420 iph->tot_len = htons(length);
421 if (!iph->id)
422 ip_select_ident(net, skb, NULL);
423
424 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
425 skb->transport_header += iphlen;
426 if (iph->protocol == IPPROTO_ICMP &&
427 length >= iphlen + sizeof(struct icmphdr))
428 icmp_out_count(net, ((struct icmphdr *)
429 skb_transport_header(skb))->type);
430 }
431
432 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
433 net, sk, skb, NULL, rt->dst.dev,
434 dst_output);
435 if (err > 0)
436 err = net_xmit_errno(err);
437 if (err)
438 goto error;
439 out:
440 return 0;
441
442 error_free:
443 kfree_skb(skb);
444 error:
445 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
446 if (err == -ENOBUFS && !inet->recverr)
447 err = 0;
448 return err;
449 }
450
451 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4)
452 {
453 int err;
454
455 if (fl4->flowi4_proto != IPPROTO_ICMP)
456 return 0;
457
458 /* We only need the first two bytes. */
459 rfv->hlen = 2;
460
461 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
462 if (err)
463 return err;
464
465 fl4->fl4_icmp_type = rfv->hdr.icmph.type;
466 fl4->fl4_icmp_code = rfv->hdr.icmph.code;
467
468 return 0;
469 }
470
471 static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
472 struct sk_buff *skb)
473 {
474 struct raw_frag_vec *rfv = from;
475
476 if (offset < rfv->hlen) {
477 int copy = min(rfv->hlen - offset, len);
478
479 if (skb->ip_summed == CHECKSUM_PARTIAL)
480 memcpy(to, rfv->hdr.c + offset, copy);
481 else
482 skb->csum = csum_block_add(
483 skb->csum,
484 csum_partial_copy_nocheck(rfv->hdr.c + offset,
485 to, copy, 0),
486 odd);
487
488 odd = 0;
489 offset += copy;
490 to += copy;
491 len -= copy;
492
493 if (!len)
494 return 0;
495 }
496
497 offset -= rfv->hlen;
498
499 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
500 }
501
502 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
503 {
504 struct inet_sock *inet = inet_sk(sk);
505 struct net *net = sock_net(sk);
506 struct ipcm_cookie ipc;
507 struct rtable *rt = NULL;
508 struct flowi4 fl4;
509 int free = 0;
510 __be32 daddr;
511 __be32 saddr;
512 u8 tos;
513 int err;
514 struct ip_options_data opt_copy;
515 struct raw_frag_vec rfv;
516 int hdrincl;
517
518 err = -EMSGSIZE;
519 if (len > 0xFFFF)
520 goto out;
521
522 /* hdrincl should be READ_ONCE(inet->hdrincl)
523 * but READ_ONCE() doesn't work with bit fields.
524 * Doing this indirectly yields the same result.
525 */
526 hdrincl = inet->hdrincl;
527 hdrincl = READ_ONCE(hdrincl);
528 /*
529 * Check the flags.
530 */
531
532 err = -EOPNOTSUPP;
533 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
534 goto out; /* compatibility */
535
536 /*
537 * Get and verify the address.
538 */
539
540 if (msg->msg_namelen) {
541 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
542 err = -EINVAL;
543 if (msg->msg_namelen < sizeof(*usin))
544 goto out;
545 if (usin->sin_family != AF_INET) {
546 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
547 __func__, current->comm);
548 err = -EAFNOSUPPORT;
549 if (usin->sin_family)
550 goto out;
551 }
552 daddr = usin->sin_addr.s_addr;
553 /* ANK: I did not forget to get protocol from port field.
554 * I just do not know, who uses this weirdness.
555 * IP_HDRINCL is much more convenient.
556 */
557 } else {
558 err = -EDESTADDRREQ;
559 if (sk->sk_state != TCP_ESTABLISHED)
560 goto out;
561 daddr = inet->inet_daddr;
562 }
563
564 ipc.sockc.tsflags = sk->sk_tsflags;
565 ipc.addr = inet->inet_saddr;
566 ipc.opt = NULL;
567 ipc.tx_flags = 0;
568 ipc.ttl = 0;
569 ipc.tos = -1;
570 ipc.oif = sk->sk_bound_dev_if;
571
572 if (msg->msg_controllen) {
573 err = ip_cmsg_send(sk, msg, &ipc, false);
574 if (unlikely(err)) {
575 kfree(ipc.opt);
576 goto out;
577 }
578 if (ipc.opt)
579 free = 1;
580 }
581
582 saddr = ipc.addr;
583 ipc.addr = daddr;
584
585 if (!ipc.opt) {
586 struct ip_options_rcu *inet_opt;
587
588 rcu_read_lock();
589 inet_opt = rcu_dereference(inet->inet_opt);
590 if (inet_opt) {
591 memcpy(&opt_copy, inet_opt,
592 sizeof(*inet_opt) + inet_opt->opt.optlen);
593 ipc.opt = &opt_copy.opt;
594 }
595 rcu_read_unlock();
596 }
597
598 if (ipc.opt) {
599 err = -EINVAL;
600 /* Linux does not mangle headers on raw sockets,
601 * so that IP options + IP_HDRINCL is non-sense.
602 */
603 if (hdrincl)
604 goto done;
605 if (ipc.opt->opt.srr) {
606 if (!daddr)
607 goto done;
608 daddr = ipc.opt->opt.faddr;
609 }
610 }
611 tos = get_rtconn_flags(&ipc, sk);
612 if (msg->msg_flags & MSG_DONTROUTE)
613 tos |= RTO_ONLINK;
614
615 if (ipv4_is_multicast(daddr)) {
616 if (!ipc.oif)
617 ipc.oif = inet->mc_index;
618 if (!saddr)
619 saddr = inet->mc_addr;
620 } else if (!ipc.oif) {
621 ipc.oif = inet->uc_index;
622 } else if (ipv4_is_lbcast(daddr) && inet->uc_index) {
623 /* oif is set, packet is to local broadcast and
624 * and uc_index is set. oif is most likely set
625 * by sk_bound_dev_if. If uc_index != oif check if the
626 * oif is an L3 master and uc_index is an L3 slave.
627 * If so, we want to allow the send using the uc_index.
628 */
629 if (ipc.oif != inet->uc_index &&
630 ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk),
631 inet->uc_index)) {
632 ipc.oif = inet->uc_index;
633 }
634 }
635
636 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
637 RT_SCOPE_UNIVERSE,
638 hdrincl ? IPPROTO_RAW : sk->sk_protocol,
639 inet_sk_flowi_flags(sk) |
640 (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
641 daddr, saddr, 0, 0, sk->sk_uid);
642
643 if (!hdrincl) {
644 rfv.msg = msg;
645 rfv.hlen = 0;
646
647 err = raw_probe_proto_opt(&rfv, &fl4);
648 if (err)
649 goto done;
650 }
651
652 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
653 rt = ip_route_output_flow(net, &fl4, sk);
654 if (IS_ERR(rt)) {
655 err = PTR_ERR(rt);
656 rt = NULL;
657 goto done;
658 }
659
660 err = -EACCES;
661 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
662 goto done;
663
664 if (msg->msg_flags & MSG_CONFIRM)
665 goto do_confirm;
666 back_from_confirm:
667
668 if (hdrincl)
669 err = raw_send_hdrinc(sk, &fl4, msg, len,
670 &rt, msg->msg_flags, &ipc.sockc);
671
672 else {
673 sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags);
674
675 if (!ipc.addr)
676 ipc.addr = fl4.daddr;
677 lock_sock(sk);
678 err = ip_append_data(sk, &fl4, raw_getfrag,
679 &rfv, len, 0,
680 &ipc, &rt, msg->msg_flags);
681 if (err)
682 ip_flush_pending_frames(sk);
683 else if (!(msg->msg_flags & MSG_MORE)) {
684 err = ip_push_pending_frames(sk, &fl4);
685 if (err == -ENOBUFS && !inet->recverr)
686 err = 0;
687 }
688 release_sock(sk);
689 }
690 done:
691 if (free)
692 kfree(ipc.opt);
693 ip_rt_put(rt);
694
695 out:
696 if (err < 0)
697 return err;
698 return len;
699
700 do_confirm:
701 if (msg->msg_flags & MSG_PROBE)
702 dst_confirm_neigh(&rt->dst, &fl4.daddr);
703 if (!(msg->msg_flags & MSG_PROBE) || len)
704 goto back_from_confirm;
705 err = 0;
706 goto done;
707 }
708
709 static void raw_close(struct sock *sk, long timeout)
710 {
711 /*
712 * Raw sockets may have direct kernel references. Kill them.
713 */
714 rtnl_lock();
715 ip_ra_control(sk, 0, NULL);
716 rtnl_unlock();
717
718 sk_common_release(sk);
719 }
720
721 static void raw_destroy(struct sock *sk)
722 {
723 lock_sock(sk);
724 ip_flush_pending_frames(sk);
725 release_sock(sk);
726 }
727
728 /* This gets rid of all the nasties in af_inet. -DaveM */
729 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
730 {
731 struct inet_sock *inet = inet_sk(sk);
732 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
733 u32 tb_id = RT_TABLE_LOCAL;
734 int ret = -EINVAL;
735 int chk_addr_ret;
736
737 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
738 goto out;
739
740 if (sk->sk_bound_dev_if)
741 tb_id = l3mdev_fib_table_by_index(sock_net(sk),
742 sk->sk_bound_dev_if) ? : tb_id;
743
744 chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr,
745 tb_id);
746
747 ret = -EADDRNOTAVAIL;
748 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
749 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
750 goto out;
751 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
752 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
753 inet->inet_saddr = 0; /* Use device */
754 sk_dst_reset(sk);
755 ret = 0;
756 out: return ret;
757 }
758
759 /*
760 * This should be easy, if there is something there
761 * we return it, otherwise we block.
762 */
763
764 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
765 int noblock, int flags, int *addr_len)
766 {
767 struct inet_sock *inet = inet_sk(sk);
768 size_t copied = 0;
769 int err = -EOPNOTSUPP;
770 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
771 struct sk_buff *skb;
772
773 if (flags & MSG_OOB)
774 goto out;
775
776 if (flags & MSG_ERRQUEUE) {
777 err = ip_recv_error(sk, msg, len, addr_len);
778 goto out;
779 }
780
781 skb = skb_recv_datagram(sk, flags, noblock, &err);
782 if (!skb)
783 goto out;
784
785 copied = skb->len;
786 if (len < copied) {
787 msg->msg_flags |= MSG_TRUNC;
788 copied = len;
789 }
790
791 err = skb_copy_datagram_msg(skb, 0, msg, copied);
792 if (err)
793 goto done;
794
795 sock_recv_ts_and_drops(msg, sk, skb);
796
797 /* Copy the address. */
798 if (sin) {
799 sin->sin_family = AF_INET;
800 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
801 sin->sin_port = 0;
802 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
803 *addr_len = sizeof(*sin);
804 }
805 if (inet->cmsg_flags)
806 ip_cmsg_recv(msg, skb);
807 if (flags & MSG_TRUNC)
808 copied = skb->len;
809 done:
810 skb_free_datagram(sk, skb);
811 out:
812 if (err)
813 return err;
814 return copied;
815 }
816
817 static int raw_init(struct sock *sk)
818 {
819 struct raw_sock *rp = raw_sk(sk);
820
821 if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
822 memset(&rp->filter, 0, sizeof(rp->filter));
823 return 0;
824 }
825
826 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
827 {
828 if (optlen > sizeof(struct icmp_filter))
829 optlen = sizeof(struct icmp_filter);
830 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
831 return -EFAULT;
832 return 0;
833 }
834
835 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
836 {
837 int len, ret = -EFAULT;
838
839 if (get_user(len, optlen))
840 goto out;
841 ret = -EINVAL;
842 if (len < 0)
843 goto out;
844 if (len > sizeof(struct icmp_filter))
845 len = sizeof(struct icmp_filter);
846 ret = -EFAULT;
847 if (put_user(len, optlen) ||
848 copy_to_user(optval, &raw_sk(sk)->filter, len))
849 goto out;
850 ret = 0;
851 out: return ret;
852 }
853
854 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
855 char __user *optval, unsigned int optlen)
856 {
857 if (optname == ICMP_FILTER) {
858 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
859 return -EOPNOTSUPP;
860 else
861 return raw_seticmpfilter(sk, optval, optlen);
862 }
863 return -ENOPROTOOPT;
864 }
865
866 static int raw_setsockopt(struct sock *sk, int level, int optname,
867 char __user *optval, unsigned int optlen)
868 {
869 if (level != SOL_RAW)
870 return ip_setsockopt(sk, level, optname, optval, optlen);
871 return do_raw_setsockopt(sk, level, optname, optval, optlen);
872 }
873
874 #ifdef CONFIG_COMPAT
875 static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
876 char __user *optval, unsigned int optlen)
877 {
878 if (level != SOL_RAW)
879 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
880 return do_raw_setsockopt(sk, level, optname, optval, optlen);
881 }
882 #endif
883
884 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
885 char __user *optval, int __user *optlen)
886 {
887 if (optname == ICMP_FILTER) {
888 if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
889 return -EOPNOTSUPP;
890 else
891 return raw_geticmpfilter(sk, optval, optlen);
892 }
893 return -ENOPROTOOPT;
894 }
895
896 static int raw_getsockopt(struct sock *sk, int level, int optname,
897 char __user *optval, int __user *optlen)
898 {
899 if (level != SOL_RAW)
900 return ip_getsockopt(sk, level, optname, optval, optlen);
901 return do_raw_getsockopt(sk, level, optname, optval, optlen);
902 }
903
904 #ifdef CONFIG_COMPAT
905 static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
906 char __user *optval, int __user *optlen)
907 {
908 if (level != SOL_RAW)
909 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
910 return do_raw_getsockopt(sk, level, optname, optval, optlen);
911 }
912 #endif
913
914 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
915 {
916 switch (cmd) {
917 case SIOCOUTQ: {
918 int amount = sk_wmem_alloc_get(sk);
919
920 return put_user(amount, (int __user *)arg);
921 }
922 case SIOCINQ: {
923 struct sk_buff *skb;
924 int amount = 0;
925
926 spin_lock_bh(&sk->sk_receive_queue.lock);
927 skb = skb_peek(&sk->sk_receive_queue);
928 if (skb)
929 amount = skb->len;
930 spin_unlock_bh(&sk->sk_receive_queue.lock);
931 return put_user(amount, (int __user *)arg);
932 }
933
934 default:
935 #ifdef CONFIG_IP_MROUTE
936 return ipmr_ioctl(sk, cmd, (void __user *)arg);
937 #else
938 return -ENOIOCTLCMD;
939 #endif
940 }
941 }
942
943 #ifdef CONFIG_COMPAT
944 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
945 {
946 switch (cmd) {
947 case SIOCOUTQ:
948 case SIOCINQ:
949 return -ENOIOCTLCMD;
950 default:
951 #ifdef CONFIG_IP_MROUTE
952 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
953 #else
954 return -ENOIOCTLCMD;
955 #endif
956 }
957 }
958 #endif
959
960 int raw_abort(struct sock *sk, int err)
961 {
962 lock_sock(sk);
963
964 sk->sk_err = err;
965 sk->sk_error_report(sk);
966 __udp_disconnect(sk, 0);
967
968 release_sock(sk);
969
970 return 0;
971 }
972 EXPORT_SYMBOL_GPL(raw_abort);
973
974 struct proto raw_prot = {
975 .name = "RAW",
976 .owner = THIS_MODULE,
977 .close = raw_close,
978 .destroy = raw_destroy,
979 .connect = ip4_datagram_connect,
980 .disconnect = __udp_disconnect,
981 .ioctl = raw_ioctl,
982 .init = raw_init,
983 .setsockopt = raw_setsockopt,
984 .getsockopt = raw_getsockopt,
985 .sendmsg = raw_sendmsg,
986 .recvmsg = raw_recvmsg,
987 .bind = raw_bind,
988 .backlog_rcv = raw_rcv_skb,
989 .release_cb = ip4_datagram_release_cb,
990 .hash = raw_hash_sk,
991 .unhash = raw_unhash_sk,
992 .obj_size = sizeof(struct raw_sock),
993 .useroffset = offsetof(struct raw_sock, filter),
994 .usersize = sizeof_field(struct raw_sock, filter),
995 .h.raw_hash = &raw_v4_hashinfo,
996 #ifdef CONFIG_COMPAT
997 .compat_setsockopt = compat_raw_setsockopt,
998 .compat_getsockopt = compat_raw_getsockopt,
999 .compat_ioctl = compat_raw_ioctl,
1000 #endif
1001 .diag_destroy = raw_abort,
1002 };
1003
1004 #ifdef CONFIG_PROC_FS
1005 static struct sock *raw_get_first(struct seq_file *seq)
1006 {
1007 struct sock *sk;
1008 struct raw_iter_state *state = raw_seq_private(seq);
1009
1010 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
1011 ++state->bucket) {
1012 sk_for_each(sk, &state->h->ht[state->bucket])
1013 if (sock_net(sk) == seq_file_net(seq))
1014 goto found;
1015 }
1016 sk = NULL;
1017 found:
1018 return sk;
1019 }
1020
1021 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
1022 {
1023 struct raw_iter_state *state = raw_seq_private(seq);
1024
1025 do {
1026 sk = sk_next(sk);
1027 try_again:
1028 ;
1029 } while (sk && sock_net(sk) != seq_file_net(seq));
1030
1031 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
1032 sk = sk_head(&state->h->ht[state->bucket]);
1033 goto try_again;
1034 }
1035 return sk;
1036 }
1037
1038 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
1039 {
1040 struct sock *sk = raw_get_first(seq);
1041
1042 if (sk)
1043 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
1044 --pos;
1045 return pos ? NULL : sk;
1046 }
1047
1048 void *raw_seq_start(struct seq_file *seq, loff_t *pos)
1049 {
1050 struct raw_iter_state *state = raw_seq_private(seq);
1051
1052 read_lock(&state->h->lock);
1053 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
1054 }
1055 EXPORT_SYMBOL_GPL(raw_seq_start);
1056
1057 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1058 {
1059 struct sock *sk;
1060
1061 if (v == SEQ_START_TOKEN)
1062 sk = raw_get_first(seq);
1063 else
1064 sk = raw_get_next(seq, v);
1065 ++*pos;
1066 return sk;
1067 }
1068 EXPORT_SYMBOL_GPL(raw_seq_next);
1069
1070 void raw_seq_stop(struct seq_file *seq, void *v)
1071 {
1072 struct raw_iter_state *state = raw_seq_private(seq);
1073
1074 read_unlock(&state->h->lock);
1075 }
1076 EXPORT_SYMBOL_GPL(raw_seq_stop);
1077
1078 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1079 {
1080 struct inet_sock *inet = inet_sk(sp);
1081 __be32 dest = inet->inet_daddr,
1082 src = inet->inet_rcv_saddr;
1083 __u16 destp = 0,
1084 srcp = inet->inet_num;
1085
1086 seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
1087 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
1088 i, src, srcp, dest, destp, sp->sk_state,
1089 sk_wmem_alloc_get(sp),
1090 sk_rmem_alloc_get(sp),
1091 0, 0L, 0,
1092 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1093 0, sock_i_ino(sp),
1094 refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1095 }
1096
1097 static int raw_seq_show(struct seq_file *seq, void *v)
1098 {
1099 if (v == SEQ_START_TOKEN)
1100 seq_printf(seq, " sl local_address rem_address st tx_queue "
1101 "rx_queue tr tm->when retrnsmt uid timeout "
1102 "inode ref pointer drops\n");
1103 else
1104 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1105 return 0;
1106 }
1107
1108 static const struct seq_operations raw_seq_ops = {
1109 .start = raw_seq_start,
1110 .next = raw_seq_next,
1111 .stop = raw_seq_stop,
1112 .show = raw_seq_show,
1113 };
1114
1115 int raw_seq_open(struct inode *ino, struct file *file,
1116 struct raw_hashinfo *h, const struct seq_operations *ops)
1117 {
1118 int err;
1119 struct raw_iter_state *i;
1120
1121 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
1122 if (err < 0)
1123 return err;
1124
1125 i = raw_seq_private((struct seq_file *)file->private_data);
1126 i->h = h;
1127 return 0;
1128 }
1129 EXPORT_SYMBOL_GPL(raw_seq_open);
1130
1131 static int raw_v4_seq_open(struct inode *inode, struct file *file)
1132 {
1133 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
1134 }
1135
1136 static const struct file_operations raw_seq_fops = {
1137 .open = raw_v4_seq_open,
1138 .read = seq_read,
1139 .llseek = seq_lseek,
1140 .release = seq_release_net,
1141 };
1142
1143 static __net_init int raw_init_net(struct net *net)
1144 {
1145 if (!proc_create("raw", S_IRUGO, net->proc_net, &raw_seq_fops))
1146 return -ENOMEM;
1147
1148 return 0;
1149 }
1150
1151 static __net_exit void raw_exit_net(struct net *net)
1152 {
1153 remove_proc_entry("raw", net->proc_net);
1154 }
1155
1156 static __net_initdata struct pernet_operations raw_net_ops = {
1157 .init = raw_init_net,
1158 .exit = raw_exit_net,
1159 };
1160
1161 int __init raw_proc_init(void)
1162 {
1163 return register_pernet_subsys(&raw_net_ops);
1164 }
1165
1166 void __init raw_proc_exit(void)
1167 {
1168 unregister_pernet_subsys(&raw_net_ops);
1169 }
1170 #endif /* CONFIG_PROC_FS */
CRIS linux kernel tree