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Linux/net/ipv4/raw.c

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  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  * Version:     $Id: raw.c,v 1.64 2002/02/01 22:01:04 davem Exp $
  9  *
 10  * Authors:     Ross Biro, <bir7@leland.Stanford.Edu>
 11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 12  *
 13  * Fixes:
 14  *              Alan Cox        :       verify_area() fixed up
 15  *              Alan Cox        :       ICMP error handling
 16  *              Alan Cox        :       EMSGSIZE if you send too big a packet
 17  *              Alan Cox        :       Now uses generic datagrams and shared
 18  *                                      skbuff library. No more peek crashes,
 19  *                                      no more backlogs
 20  *              Alan Cox        :       Checks sk->broadcast.
 21  *              Alan Cox        :       Uses skb_free_datagram/skb_copy_datagram
 22  *              Alan Cox        :       Raw passes ip options too
 23  *              Alan Cox        :       Setsocketopt added
 24  *              Alan Cox        :       Fixed error return for broadcasts
 25  *              Alan Cox        :       Removed wake_up calls
 26  *              Alan Cox        :       Use ttl/tos
 27  *              Alan Cox        :       Cleaned up old debugging
 28  *              Alan Cox        :       Use new kernel side addresses
 29  *      Arnt Gulbrandsen        :       Fixed MSG_DONTROUTE in raw sockets.
 30  *              Alan Cox        :       BSD style RAW socket demultiplexing.
 31  *              Alan Cox        :       Beginnings of mrouted support.
 32  *              Alan Cox        :       Added IP_HDRINCL option.
 33  *              Alan Cox        :       Skip broadcast check if BSDism set.
 34  *              David S. Miller :       New socket lookup architecture.
 35  *
 36  *              This program is free software; you can redistribute it and/or
 37  *              modify it under the terms of the GNU General Public License
 38  *              as published by the Free Software Foundation; either version
 39  *              2 of the License, or (at your option) any later version.
 40  */
 41  
 42 #include <linux/config.h> 
 43 #include <asm/atomic.h>
 44 #include <asm/byteorder.h>
 45 #include <asm/current.h>
 46 #include <asm/uaccess.h>
 47 #include <asm/ioctls.h>
 48 #include <linux/types.h>
 49 #include <linux/stddef.h>
 50 #include <linux/slab.h>
 51 #include <linux/errno.h>
 52 #include <linux/aio.h>
 53 #include <linux/kernel.h>
 54 #include <linux/spinlock.h>
 55 #include <linux/sockios.h>
 56 #include <linux/socket.h>
 57 #include <linux/in.h>
 58 #include <linux/mroute.h>
 59 #include <linux/netdevice.h>
 60 #include <linux/in_route.h>
 61 #include <linux/route.h>
 62 #include <linux/tcp.h>
 63 #include <linux/skbuff.h>
 64 #include <net/dst.h>
 65 #include <net/sock.h>
 66 #include <linux/gfp.h>
 67 #include <linux/ip.h>
 68 #include <linux/net.h>
 69 #include <net/ip.h>
 70 #include <net/icmp.h>
 71 #include <net/udp.h>
 72 #include <net/raw.h>
 73 #include <net/snmp.h>
 74 #include <net/inet_common.h>
 75 #include <net/checksum.h>
 76 #include <net/xfrm.h>
 77 #include <linux/rtnetlink.h>
 78 #include <linux/proc_fs.h>
 79 #include <linux/seq_file.h>
 80 #include <linux/netfilter.h>
 81 #include <linux/netfilter_ipv4.h>
 82 
 83 struct hlist_head raw_v4_htable[RAWV4_HTABLE_SIZE];
 84 rwlock_t raw_v4_lock = RW_LOCK_UNLOCKED;
 85 
 86 static void raw_v4_hash(struct sock *sk)
 87 {
 88         struct hlist_head *head = &raw_v4_htable[inet_sk(sk)->num &
 89                                                  (RAWV4_HTABLE_SIZE - 1)];
 90 
 91         write_lock_bh(&raw_v4_lock);
 92         sk_add_node(sk, head);
 93         sock_prot_inc_use(sk->sk_prot);
 94         write_unlock_bh(&raw_v4_lock);
 95 }
 96 
 97 static void raw_v4_unhash(struct sock *sk)
 98 {
 99         write_lock_bh(&raw_v4_lock);
100         if (sk_del_node_init(sk))
101                 sock_prot_dec_use(sk->sk_prot);
102         write_unlock_bh(&raw_v4_lock);
103 }
104 
105 struct sock *__raw_v4_lookup(struct sock *sk, unsigned short num,
106                              unsigned long raddr, unsigned long laddr,
107                              int dif)
108 {
109         struct hlist_node *node;
110 
111         sk_for_each_from(sk, node) {
112                 struct inet_opt *inet = inet_sk(sk);
113 
114                 if (inet->num == num                                    &&
115                     !(inet->daddr && inet->daddr != raddr)              &&
116                     !(inet->rcv_saddr && inet->rcv_saddr != laddr)      &&
117                     !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
118                         goto found; /* gotcha */
119         }
120         sk = NULL;
121 found:
122         return sk;
123 }
124 
125 /*
126  *      0 - deliver
127  *      1 - block
128  */
129 static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
130 {
131         int type;
132 
133         type = skb->h.icmph->type;
134         if (type < 32) {
135                 __u32 data = raw4_sk(sk)->filter.data;
136 
137                 return ((1 << type) & data) != 0;
138         }
139 
140         /* Do not block unknown ICMP types */
141         return 0;
142 }
143 
144 /* IP input processing comes here for RAW socket delivery.
145  * Caller owns SKB, so we must make clones.
146  *
147  * RFC 1122: SHOULD pass TOS value up to the transport layer.
148  * -> It does. And not only TOS, but all IP header.
149  */
150 void raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
151 {
152         struct sock *sk;
153         struct hlist_head *head;
154 
155         read_lock(&raw_v4_lock);
156         head = &raw_v4_htable[hash];
157         if (hlist_empty(head))
158                 goto out;
159         sk = __raw_v4_lookup(__sk_head(head), iph->protocol,
160                              iph->saddr, iph->daddr,
161                              skb->dev->ifindex);
162 
163         while (sk) {
164                 if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
165                         struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
166 
167                         /* Not releasing hash table! */
168                         if (clone)
169                                 raw_rcv(sk, clone);
170                 }
171                 sk = __raw_v4_lookup(sk_next(sk), iph->protocol,
172                                      iph->saddr, iph->daddr,
173                                      skb->dev->ifindex);
174         }
175 out:
176         read_unlock(&raw_v4_lock);
177 }
178 
179 void raw_err (struct sock *sk, struct sk_buff *skb, u32 info)
180 {
181         struct inet_opt *inet = inet_sk(sk);
182         int type = skb->h.icmph->type;
183         int code = skb->h.icmph->code;
184         int err = 0;
185         int harderr = 0;
186 
187         /* Report error on raw socket, if:
188            1. User requested ip_recverr.
189            2. Socket is connected (otherwise the error indication
190               is useless without ip_recverr and error is hard.
191          */
192         if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
193                 return;
194 
195         switch (type) {
196         default:
197         case ICMP_TIME_EXCEEDED:
198                 err = EHOSTUNREACH;
199                 break;
200         case ICMP_SOURCE_QUENCH:
201                 return;
202         case ICMP_PARAMETERPROB:
203                 err = EPROTO;
204                 harderr = 1;
205                 break;
206         case ICMP_DEST_UNREACH:
207                 err = EHOSTUNREACH;
208                 if (code > NR_ICMP_UNREACH)
209                         break;
210                 err = icmp_err_convert[code].errno;
211                 harderr = icmp_err_convert[code].fatal;
212                 if (code == ICMP_FRAG_NEEDED) {
213                         harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
214                         err = EMSGSIZE;
215                 }
216         }
217 
218         if (inet->recverr) {
219                 struct iphdr *iph = (struct iphdr*)skb->data;
220                 u8 *payload = skb->data + (iph->ihl << 2);
221 
222                 if (inet->hdrincl)
223                         payload = skb->data;
224                 ip_icmp_error(sk, skb, err, 0, info, payload);
225         }
226 
227         if (inet->recverr || harderr) {
228                 sk->sk_err = err;
229                 sk->sk_error_report(sk);
230         }
231 }
232 
233 static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb)
234 {
235         /* Charge it to the socket. */
236         
237         if (sock_queue_rcv_skb(sk, skb) < 0) {
238                 /* FIXME: increment a raw drops counter here */
239                 kfree_skb(skb);
240                 return NET_RX_DROP;
241         }
242 
243         return NET_RX_SUCCESS;
244 }
245 
246 int raw_rcv(struct sock *sk, struct sk_buff *skb)
247 {
248         if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
249                 kfree_skb(skb);
250                 return NET_RX_DROP;
251         }
252 
253         skb_push(skb, skb->data - skb->nh.raw);
254 
255         raw_rcv_skb(sk, skb);
256         return 0;
257 }
258 
259 static int raw_send_hdrinc(struct sock *sk, void *from, int length,
260                         struct rtable *rt, 
261                         unsigned int flags)
262 {
263         struct inet_opt *inet = inet_sk(sk);
264         int hh_len;
265         struct iphdr *iph;
266         struct sk_buff *skb;
267         int err;
268 
269         if (length > rt->u.dst.dev->mtu) {
270                 ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->dport,
271                                rt->u.dst.dev->mtu);
272                 return -EMSGSIZE;
273         }
274         if (flags&MSG_PROBE)
275                 goto out;
276 
277         hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
278 
279         skb = sock_alloc_send_skb(sk, length+hh_len+15,
280                                   flags&MSG_DONTWAIT, &err);
281         if (skb == NULL)
282                 goto error; 
283         skb_reserve(skb, hh_len);
284 
285         skb->priority = sk->sk_priority;
286         skb->dst = dst_clone(&rt->u.dst);
287 
288         skb->nh.iph = iph = (struct iphdr *)skb_put(skb, length);
289 
290         skb->ip_summed = CHECKSUM_NONE;
291 
292         skb->h.raw = skb->nh.raw;
293         err = memcpy_fromiovecend((void *)iph, from, 0, length);
294         if (err)
295                 goto error_fault;
296 
297         /* We don't modify invalid header */
298         if (length >= sizeof(*iph) && iph->ihl * 4 <= length) {
299                 if (!iph->saddr)
300                         iph->saddr = rt->rt_src;
301                 iph->check   = 0;
302                 iph->tot_len = htons(length);
303                 if (!iph->id)
304                         ip_select_ident(iph, &rt->u.dst, NULL);
305 
306                 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
307         }
308 
309         err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
310                       dst_output);
311         if (err > 0)
312                 err = inet->recverr ? net_xmit_errno(err) : 0;
313         if (err)
314                 goto error;
315 out:
316         return 0;
317 
318 error_fault:
319         err = -EFAULT;
320         kfree_skb(skb);
321 error:
322         IP_INC_STATS(IpOutDiscards);
323         return err; 
324 }
325 
326 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
327                        int len)
328 {
329         struct inet_opt *inet = inet_sk(sk);
330         struct ipcm_cookie ipc;
331         struct rtable *rt = NULL;
332         int free = 0;
333         u32 daddr;
334         u32 saddr;
335         u8  tos;
336         int err;
337 
338         /* This check is ONLY to check for arithmetic overflow
339            on integer(!) len. Not more! Real check will be made
340            in ip_build_xmit --ANK
341 
342            BTW socket.c -> af_*.c -> ... make multiple
343            invalid conversions size_t -> int. We MUST repair it f.e.
344            by replacing all of them with size_t and revise all
345            the places sort of len += sizeof(struct iphdr)
346            If len was ULONG_MAX-10 it would be cathastrophe  --ANK
347          */
348 
349         err = -EMSGSIZE;
350         if (len < 0 || len > 0xFFFF)
351                 goto out;
352 
353         /*
354          *      Check the flags.
355          */
356 
357         err = -EOPNOTSUPP;
358         if (msg->msg_flags & MSG_OOB)   /* Mirror BSD error message */
359                 goto out;               /* compatibility */
360                          
361         /*
362          *      Get and verify the address. 
363          */
364 
365         if (msg->msg_namelen) {
366                 struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name;
367                 err = -EINVAL;
368                 if (msg->msg_namelen < sizeof(*usin))
369                         goto out;
370                 if (usin->sin_family != AF_INET) {
371                         static int complained;
372                         if (!complained++)
373                                 printk(KERN_INFO "%s forgot to set AF_INET in "
374                                                  "raw sendmsg. Fix it!\n",
375                                                  current->comm);
376                         err = -EINVAL;
377                         if (usin->sin_family)
378                                 goto out;
379                 }
380                 daddr = usin->sin_addr.s_addr;
381                 /* ANK: I did not forget to get protocol from port field.
382                  * I just do not know, who uses this weirdness.
383                  * IP_HDRINCL is much more convenient.
384                  */
385         } else {
386                 err = -EDESTADDRREQ;
387                 if (sk->sk_state != TCP_ESTABLISHED) 
388                         goto out;
389                 daddr = inet->daddr;
390         }
391 
392         ipc.addr = inet->saddr;
393         ipc.opt = NULL;
394         ipc.oif = sk->sk_bound_dev_if;
395 
396         if (msg->msg_controllen) {
397                 err = ip_cmsg_send(msg, &ipc);
398                 if (err)
399                         goto out;
400                 if (ipc.opt)
401                         free = 1;
402         }
403 
404         saddr = ipc.addr;
405         ipc.addr = daddr;
406 
407         if (!ipc.opt)
408                 ipc.opt = inet->opt;
409 
410         if (ipc.opt) {
411                 err = -EINVAL;
412                 /* Linux does not mangle headers on raw sockets,
413                  * so that IP options + IP_HDRINCL is non-sense.
414                  */
415                 if (inet->hdrincl)
416                         goto done;
417                 if (ipc.opt->srr) {
418                         if (!daddr)
419                                 goto done;
420                         daddr = ipc.opt->faddr;
421                 }
422         }
423         tos = RT_TOS(inet->tos) | sk->sk_localroute;
424         if (msg->msg_flags & MSG_DONTROUTE)
425                 tos |= RTO_ONLINK;
426 
427         if (MULTICAST(daddr)) {
428                 if (!ipc.oif)
429                         ipc.oif = inet->mc_index;
430                 if (!saddr)
431                         saddr = inet->mc_addr;
432         }
433 
434         {
435                 struct flowi fl = { .oif = ipc.oif,
436                                     .nl_u = { .ip4_u =
437                                               { .daddr = daddr,
438                                                 .saddr = saddr,
439                                                 .tos = tos } },
440                                     .proto = inet->hdrincl ? IPPROTO_RAW :
441                                                              sk->sk_protocol,
442                                   };
443                 err = ip_route_output_flow(&rt, &fl, sk, !(msg->msg_flags&MSG_DONTWAIT));
444         }
445         if (err)
446                 goto done;
447 
448         err = -EACCES;
449         if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
450                 goto done;
451 
452         if (msg->msg_flags & MSG_CONFIRM)
453                 goto do_confirm;
454 back_from_confirm:
455 
456         if (inet->hdrincl)
457                 err = raw_send_hdrinc(sk, msg->msg_iov, len, 
458                                         rt, msg->msg_flags);
459         
460          else {
461                 if (!ipc.addr)
462                         ipc.addr = rt->rt_dst;
463                 lock_sock(sk);
464                 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
465                                         &ipc, rt, msg->msg_flags);
466                 if (err)
467                         ip_flush_pending_frames(sk);
468                 else if (!(msg->msg_flags & MSG_MORE))
469                         err = ip_push_pending_frames(sk);
470                 release_sock(sk);
471         }
472 done:
473         if (free)
474                 kfree(ipc.opt);
475         ip_rt_put(rt);
476 
477 out:    return err < 0 ? err : len;
478 
479 do_confirm:
480         dst_confirm(&rt->u.dst);
481         if (!(msg->msg_flags & MSG_PROBE) || len)
482                 goto back_from_confirm;
483         err = 0;
484         goto done;
485 }
486 
487 static void raw_close(struct sock *sk, long timeout)
488 {
489         /*
490          * Raw sockets may have direct kernel refereneces. Kill them.
491          */
492         ip_ra_control(sk, 0, NULL);
493 
494         inet_sock_release(sk);
495 }
496 
497 /* This gets rid of all the nasties in af_inet. -DaveM */
498 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
499 {
500         struct inet_opt *inet = inet_sk(sk);
501         struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
502         int ret = -EINVAL;
503         int chk_addr_ret;
504 
505         if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
506                 goto out;
507         chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
508         ret = -EADDRNOTAVAIL;
509         if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
510             chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
511                 goto out;
512         inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
513         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
514                 inet->saddr = 0;  /* Use device */
515         sk_dst_reset(sk);
516         ret = 0;
517 out:    return ret;
518 }
519 
520 /*
521  *      This should be easy, if there is something there
522  *      we return it, otherwise we block.
523  */
524 
525 int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
526                 int len, int noblock, int flags, int *addr_len)
527 {
528         struct inet_opt *inet = inet_sk(sk);
529         int copied = 0;
530         int err = -EOPNOTSUPP;
531         struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
532         struct sk_buff *skb;
533 
534         if (flags & MSG_OOB)
535                 goto out;
536 
537         if (addr_len)
538                 *addr_len = sizeof(*sin);
539 
540         if (flags & MSG_ERRQUEUE) {
541                 err = ip_recv_error(sk, msg, len);
542                 goto out;
543         }
544 
545         skb = skb_recv_datagram(sk, flags, noblock, &err);
546         if (!skb)
547                 goto out;
548 
549         copied = skb->len;
550         if (len < copied) {
551                 msg->msg_flags |= MSG_TRUNC;
552                 copied = len;
553         }
554 
555         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
556         if (err)
557                 goto done;
558 
559         sock_recv_timestamp(msg, sk, skb);
560 
561         /* Copy the address. */
562         if (sin) {
563                 sin->sin_family = AF_INET;
564                 sin->sin_addr.s_addr = skb->nh.iph->saddr;
565                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
566         }
567         if (inet->cmsg_flags)
568                 ip_cmsg_recv(msg, skb);
569 done:
570         skb_free_datagram(sk, skb);
571 out:    return err ? : copied;
572 }
573 
574 static int raw_init(struct sock *sk)
575 {
576         struct raw_opt *tp = raw4_sk(sk);
577         if (inet_sk(sk)->num == IPPROTO_ICMP)
578                 memset(&tp->filter, 0, sizeof(tp->filter));
579         return 0;
580 }
581 
582 static int raw_seticmpfilter(struct sock *sk, char *optval, int optlen)
583 {
584         if (optlen > sizeof(struct icmp_filter))
585                 optlen = sizeof(struct icmp_filter);
586         if (copy_from_user(&raw4_sk(sk)->filter, optval, optlen))
587                 return -EFAULT;
588         return 0;
589 }
590 
591 static int raw_geticmpfilter(struct sock *sk, char *optval, int *optlen)
592 {
593         int len, ret = -EFAULT;
594 
595         if (get_user(len, optlen))
596                 goto out;
597         ret = -EINVAL;
598         if (len < 0)
599                 goto out;
600         if (len > sizeof(struct icmp_filter))
601                 len = sizeof(struct icmp_filter);
602         ret = -EFAULT;
603         if (put_user(len, optlen) ||
604             copy_to_user(optval, &raw4_sk(sk)->filter, len))
605                 goto out;
606         ret = 0;
607 out:    return ret;
608 }
609 
610 static int raw_setsockopt(struct sock *sk, int level, int optname, 
611                           char *optval, int optlen)
612 {
613         if (level != SOL_RAW)
614                 return ip_setsockopt(sk, level, optname, optval, optlen);
615 
616         if (optname == ICMP_FILTER) {
617                 if (inet_sk(sk)->num != IPPROTO_ICMP)
618                         return -EOPNOTSUPP;
619                 else
620                         return raw_seticmpfilter(sk, optval, optlen);
621         }
622         return -ENOPROTOOPT;
623 }
624 
625 static int raw_getsockopt(struct sock *sk, int level, int optname, 
626                           char *optval, int *optlen)
627 {
628         if (level != SOL_RAW)
629                 return ip_getsockopt(sk, level, optname, optval, optlen);
630 
631         if (optname == ICMP_FILTER) {
632                 if (inet_sk(sk)->num != IPPROTO_ICMP)
633                         return -EOPNOTSUPP;
634                 else
635                         return raw_geticmpfilter(sk, optval, optlen);
636         }
637         return -ENOPROTOOPT;
638 }
639 
640 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
641 {
642         switch (cmd) {
643                 case SIOCOUTQ: {
644                         int amount = atomic_read(&sk->sk_wmem_alloc);
645                         return put_user(amount, (int *)arg);
646                 }
647                 case SIOCINQ: {
648                         struct sk_buff *skb;
649                         int amount = 0;
650 
651                         spin_lock_irq(&sk->sk_receive_queue.lock);
652                         skb = skb_peek(&sk->sk_receive_queue);
653                         if (skb != NULL)
654                                 amount = skb->len;
655                         spin_unlock_irq(&sk->sk_receive_queue.lock);
656                         return put_user(amount, (int *)arg);
657                 }
658 
659                 default:
660 #ifdef CONFIG_IP_MROUTE
661                         return ipmr_ioctl(sk, cmd, arg);
662 #else
663                         return -ENOIOCTLCMD;
664 #endif
665         }
666 }
667 
668 struct proto raw_prot = {
669         .name =         "RAW",
670         .close =        raw_close,
671         .connect =      udp_connect,
672         .disconnect =   udp_disconnect,
673         .ioctl =        raw_ioctl,
674         .init =         raw_init,
675         .setsockopt =   raw_setsockopt,
676         .getsockopt =   raw_getsockopt,
677         .sendmsg =      raw_sendmsg,
678         .recvmsg =      raw_recvmsg,
679         .bind =         raw_bind,
680         .backlog_rcv =  raw_rcv_skb,
681         .hash =         raw_v4_hash,
682         .unhash =       raw_v4_unhash,
683 };
684 
685 #ifdef CONFIG_PROC_FS
686 struct raw_iter_state {
687         int bucket;
688 };
689 
690 #define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private)
691 
692 static struct sock *raw_get_first(struct seq_file *seq)
693 {
694         struct sock *sk;
695         struct raw_iter_state* state = raw_seq_private(seq);
696 
697         for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) {
698                 struct hlist_node *node;
699 
700                 sk_for_each(sk, node, &raw_v4_htable[state->bucket])
701                         if (sk->sk_family == PF_INET)
702                                 goto found;
703         }
704         sk = NULL;
705 found:
706         return sk;
707 }
708 
709 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
710 {
711         struct raw_iter_state* state = raw_seq_private(seq);
712 
713         do {
714                 sk = sk_next(sk);
715 try_again:
716                 ;
717         } while (sk && sk->sk_family != PF_INET);
718 
719         if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) {
720                 sk = sk_head(&raw_v4_htable[state->bucket]);
721                 goto try_again;
722         }
723         return sk;
724 }
725 
726 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
727 {
728         struct sock *sk = raw_get_first(seq);
729 
730         if (sk)
731                 while (pos && (sk = raw_get_next(seq, sk)) != NULL)
732                         --pos;
733         return pos ? NULL : sk;
734 }
735 
736 static void *raw_seq_start(struct seq_file *seq, loff_t *pos)
737 {
738         read_lock(&raw_v4_lock);
739         return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
740 }
741 
742 static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
743 {
744         struct sock *sk;
745 
746         if (v == SEQ_START_TOKEN)
747                 sk = raw_get_first(seq);
748         else
749                 sk = raw_get_next(seq, v);
750         ++*pos;
751         return sk;
752 }
753 
754 static void raw_seq_stop(struct seq_file *seq, void *v)
755 {
756         read_unlock(&raw_v4_lock);
757 }
758 
759 static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i)
760 {
761         struct inet_opt *inet = inet_sk(sp);
762         unsigned int dest = inet->daddr,
763                      src = inet->rcv_saddr;
764         __u16 destp = 0,
765               srcp  = inet->num;
766 
767         sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
768                 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
769                 i, src, srcp, dest, destp, sp->sk_state, 
770                 atomic_read(&sp->sk_wmem_alloc),
771                 atomic_read(&sp->sk_rmem_alloc),
772                 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
773                 atomic_read(&sp->sk_refcnt), sp);
774         return tmpbuf;
775 }
776 
777 static int raw_seq_show(struct seq_file *seq, void *v)
778 {
779         char tmpbuf[129];
780 
781         if (v == SEQ_START_TOKEN)
782                 seq_printf(seq, "%-127s\n",
783                                "  sl  local_address rem_address   st tx_queue "
784                                "rx_queue tr tm->when retrnsmt   uid  timeout "
785                                "inode");
786         else {
787                 struct raw_iter_state *state = raw_seq_private(seq);
788 
789                 seq_printf(seq, "%-127s\n",
790                            get_raw_sock(v, tmpbuf, state->bucket));
791         }
792         return 0;
793 }
794 
795 static struct seq_operations raw_seq_ops = {
796         .start = raw_seq_start,
797         .next  = raw_seq_next,
798         .stop  = raw_seq_stop,
799         .show  = raw_seq_show,
800 };
801 
802 static int raw_seq_open(struct inode *inode, struct file *file)
803 {
804         struct seq_file *seq;
805         int rc = -ENOMEM;
806         struct raw_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
807 
808         if (!s)
809                 goto out;
810         rc = seq_open(file, &raw_seq_ops);
811         if (rc)
812                 goto out_kfree;
813 
814         seq = file->private_data;
815         seq->private = s;
816         memset(s, 0, sizeof(*s));
817 out:
818         return rc;
819 out_kfree:
820         kfree(s);
821         goto out;
822 }
823 
824 static struct file_operations raw_seq_fops = {
825         .owner   = THIS_MODULE,
826         .open    = raw_seq_open,
827         .read    = seq_read,
828         .llseek  = seq_lseek,
829         .release = seq_release_private,
830 };
831 
832 int __init raw_proc_init(void)
833 {
834         if (!proc_net_fops_create("raw", S_IRUGO, &raw_seq_fops))
835                 return -ENOMEM;
836         return 0;
837 }
838 
839 void __init raw_proc_exit(void)
840 {
841         proc_net_remove("raw");
842 }
843 #endif /* CONFIG_PROC_FS */
844 

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