1/* linux/net/ipv4/arp.c 2 * 3 * Version: $Id: arp.c,v 1.1.1.1 2007/08/03 18:53:51 Exp $ 4 * 5 * Copyright (C) 1994 by Florian La Roche 6 * 7 * This module implements the Address Resolution Protocol ARP (RFC 826), 8 * which is used to convert IP addresses (or in the future maybe other 9 * high-level addresses) into a low-level hardware address (like an Ethernet 10 * address). 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 * 17 * Fixes: 18 * Alan Cox : Removed the Ethernet assumptions in 19 * Florian's code 20 * Alan Cox : Fixed some small errors in the ARP 21 * logic 22 * Alan Cox : Allow >4K in /proc 23 * Alan Cox : Make ARP add its own protocol entry 24 * Ross Martin : Rewrote arp_rcv() and arp_get_info() 25 * Stephen Henson : Add AX25 support to arp_get_info() 26 * Alan Cox : Drop data when a device is downed. 27 * Alan Cox : Use init_timer(). 28 * Alan Cox : Double lock fixes. 29 * Martin Seine : Move the arphdr structure 30 * to if_arp.h for compatibility. 31 * with BSD based programs. 32 * Andrew Tridgell : Added ARP netmask code and 33 * re-arranged proxy handling. 34 * Alan Cox : Changed to use notifiers. 35 * Niibe Yutaka : Reply for this device or proxies only. 36 * Alan Cox : Don't proxy across hardware types! 37 * Jonathan Naylor : Added support for NET/ROM. 38 * Mike Shaver : RFC1122 checks. 39 * Jonathan Naylor : Only lookup the hardware address for 40 * the correct hardware type. 41 * Germano Caronni : Assorted subtle races. 42 * Craig Schlenter : Don't modify permanent entry 43 * during arp_rcv. 44 * Russ Nelson : Tidied up a few bits. 45 * Alexey Kuznetsov: Major changes to caching and behaviour, 46 * eg intelligent arp probing and 47 * generation 48 * of host down events. 49 * Alan Cox : Missing unlock in device events. 50 * Eckes : ARP ioctl control errors. 51 * Alexey Kuznetsov: Arp free fix. 52 * Manuel Rodriguez: Gratuitous ARP. 53 * Jonathan Layes : Added arpd support through kerneld 54 * message queue (960314) 55 * Mike Shaver : /proc/sys/net/ipv4/arp_* support 56 * Mike McLagan : Routing by source 57 * Stuart Cheshire : Metricom and grat arp fixes 58 * *** FOR 2.1 clean this up *** 59 * Lawrence V. Stefani: (08/12/96) Added FDDI support. 60 * Alan Cox : Took the AP1000 nasty FDDI hack and 61 * folded into the mainstream FDDI code. 62 * Ack spit, Linus how did you allow that 63 * one in... 64 * Jes Sorensen : Make FDDI work again in 2.1.x and 65 * clean up the APFDDI & gen. FDDI bits. 66 * Alexey Kuznetsov: new arp state machine; 67 * now it is in net/core/neighbour.c. 68 * Krzysztof Halasa: Added Frame Relay ARP support. 69 * Arnaldo C. Melo : convert /proc/net/arp to seq_file 70 * Shmulik Hen: Split arp_send to arp_create and 71 * arp_xmit so intermediate drivers like 72 * bonding can change the skb before 73 * sending (e.g. insert 8021q tag). 74 * Harald Welte : convert to make use of jenkins hash 75 */ 76 77#include <linux/module.h> 78#include <linux/types.h> 79#include <linux/string.h> 80#include <linux/kernel.h> 81#include <linux/capability.h> 82#include <linux/socket.h> 83#include <linux/sockios.h> 84#include <linux/errno.h> 85#include <linux/in.h> 86#include <linux/mm.h> 87#include <linux/inet.h> 88#include <linux/inetdevice.h> 89#include <linux/netdevice.h> 90#include <linux/etherdevice.h> 91#include <linux/fddidevice.h> 92#include <linux/if_arp.h> 93#include <linux/trdevice.h> 94#include <linux/skbuff.h> 95#include <linux/proc_fs.h> 96#include <linux/seq_file.h> 97#include <linux/stat.h> 98#include <linux/init.h> 99#include <linux/net.h> 100#include <linux/rcupdate.h> 101#include <linux/jhash.h> 102#ifdef CONFIG_SYSCTL 103#include <linux/sysctl.h> 104#endif 105 106#include <net/ip.h> 107#include <net/icmp.h> 108#include <net/route.h> 109#include <net/protocol.h> 110#include <net/tcp.h> 111#include <net/sock.h> 112#include <net/arp.h> 113#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 114#include <net/ax25.h> 115#if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE) 116#include <net/netrom.h> 117#endif 118#endif 119#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE) 120#include <net/atmclip.h> 121struct neigh_table *clip_tbl_hook; 122#endif 123 124#include <asm/system.h> 125#include <asm/uaccess.h> 126 127#include <linux/netfilter_arp.h> 128 129/* 130 * Interface to generic neighbour cache. 131 */ 132static u32 arp_hash(const void *pkey, const struct net_device *dev); 133static int arp_constructor(struct neighbour *neigh); 134static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb); 135static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb); 136static void parp_redo(struct sk_buff *skb); 137/* foxconn wklin modified start, 2010/06/15 @attach_dev */ 138static int attadev_update(u32 sip, char *sha, struct net_device *indev); 139/* foxconn wklin modified end, 2010/06/15 */ 140static int wandev_update(u32 sip, char *sha, struct net_device *indev); 141static int wandev_init(void); 142static int attadev_init(void); 143 144static struct neigh_ops arp_generic_ops = { 145 .family = AF_INET, 146 .solicit = arp_solicit, 147 .error_report = arp_error_report, 148 .output = neigh_resolve_output, 149 .connected_output = neigh_connected_output, 150 .hh_output = dev_queue_xmit, 151 .queue_xmit = dev_queue_xmit, 152}; 153 154static struct neigh_ops arp_hh_ops = { 155 .family = AF_INET, 156 .solicit = arp_solicit, 157 .error_report = arp_error_report, 158 .output = neigh_resolve_output, 159 .connected_output = neigh_resolve_output, 160 .hh_output = dev_queue_xmit, 161 .queue_xmit = dev_queue_xmit, 162}; 163 164static struct neigh_ops arp_direct_ops = { 165 .family = AF_INET, 166 .output = dev_queue_xmit, 167 .connected_output = dev_queue_xmit, 168 .hh_output = dev_queue_xmit, 169 .queue_xmit = dev_queue_xmit, 170}; 171 172struct neigh_ops arp_broken_ops = { 173 .family = AF_INET, 174 .solicit = arp_solicit, 175 .error_report = arp_error_report, 176 .output = neigh_compat_output, 177 .connected_output = neigh_compat_output, 178 .hh_output = dev_queue_xmit, 179 .queue_xmit = dev_queue_xmit, 180}; 181 182struct neigh_table arp_tbl = { 183 .family = AF_INET, 184 .entry_size = sizeof(struct neighbour) + 4, 185 .key_len = 4, 186 .hash = arp_hash, 187 .constructor = arp_constructor, 188 .proxy_redo = parp_redo, 189 .id = "arp_cache", 190 .parms = { 191 .tbl = &arp_tbl, 192 .base_reachable_time = 30 * HZ, 193 .retrans_time = 1 * HZ, 194 .gc_staletime = 60 * HZ, 195 .reachable_time = 30 * HZ, 196 .delay_probe_time = 5 * HZ, 197 .queue_len = 3, 198 .ucast_probes = 3, 199 .mcast_probes = 3, 200 .anycast_delay = 1 * HZ, 201 .proxy_delay = (8 * HZ) / 10, 202 .proxy_qlen = 64, 203 .locktime = 1 * HZ, 204 }, 205 .gc_interval = 30 * HZ, 206 .gc_thresh1 = 128, 207 .gc_thresh2 = 512, 208 .gc_thresh3 = 1024, 209}; 210 211int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir) 212{ 213 switch (dev->type) { 214 case ARPHRD_ETHER: 215 case ARPHRD_FDDI: 216 case ARPHRD_IEEE802: 217 ip_eth_mc_map(addr, haddr); 218 return 0; 219 case ARPHRD_IEEE802_TR: 220 ip_tr_mc_map(addr, haddr); 221 return 0; 222 case ARPHRD_INFINIBAND: 223 ip_ib_mc_map(addr, haddr); 224 return 0; 225 default: 226 if (dir) { 227 memcpy(haddr, dev->broadcast, dev->addr_len); 228 return 0; 229 } 230 } 231 return -EINVAL; 232} 233 234 235static u32 arp_hash(const void *pkey, const struct net_device *dev) 236{ 237 return jhash_2words(*(u32 *)pkey, dev->ifindex, arp_tbl.hash_rnd); 238} 239 240static int arp_constructor(struct neighbour *neigh) 241{ 242 __be32 addr = *(__be32*)neigh->primary_key; 243 struct net_device *dev = neigh->dev; 244 struct in_device *in_dev; 245 struct neigh_parms *parms; 246 247 neigh->type = inet_addr_type(addr); 248 249 rcu_read_lock(); 250 in_dev = __in_dev_get_rcu(dev); 251 if (in_dev == NULL) { 252 rcu_read_unlock(); 253 return -EINVAL; 254 } 255 256 parms = in_dev->arp_parms; 257 __neigh_parms_put(neigh->parms); 258 neigh->parms = neigh_parms_clone(parms); 259 rcu_read_unlock(); 260 261 if (dev->hard_header == NULL) { 262 neigh->nud_state = NUD_NOARP; 263 neigh->ops = &arp_direct_ops; 264 neigh->output = neigh->ops->queue_xmit; 265 } else { 266 /* Good devices (checked by reading texts, but only Ethernet is 267 tested) 268 269 ARPHRD_ETHER: (ethernet, apfddi) 270 ARPHRD_FDDI: (fddi) 271 ARPHRD_IEEE802: (tr) 272 ARPHRD_METRICOM: (strip) 273 ARPHRD_ARCNET: 274 etc. etc. etc. 275 276 ARPHRD_IPDDP will also work, if author repairs it. 277 I did not it, because this driver does not work even 278 in old paradigm. 279 */ 280 281 /* So... these "amateur" devices are hopeless. 282 The only thing, that I can say now: 283 It is very sad that we need to keep ugly obsolete 284 code to make them happy. 285 286 They should be moved to more reasonable state, now 287 they use rebuild_header INSTEAD OF hard_start_xmit!!! 288 Besides that, they are sort of out of date 289 (a lot of redundant clones/copies, useless in 2.1), 290 I wonder why people believe that they work. 291 */ 292 switch (dev->type) { 293 default: 294 break; 295 case ARPHRD_ROSE: 296#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 297 case ARPHRD_AX25: 298#if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE) 299 case ARPHRD_NETROM: 300#endif 301 neigh->ops = &arp_broken_ops; 302 neigh->output = neigh->ops->output; 303 return 0; 304#endif 305 ;} 306 if (neigh->type == RTN_MULTICAST) { 307 neigh->nud_state = NUD_NOARP; 308 arp_mc_map(addr, neigh->ha, dev, 1); 309 } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { 310 neigh->nud_state = NUD_NOARP; 311 memcpy(neigh->ha, dev->dev_addr, dev->addr_len); 312 } else if (neigh->type == RTN_BROADCAST || dev->flags&IFF_POINTOPOINT) { 313 neigh->nud_state = NUD_NOARP; 314 memcpy(neigh->ha, dev->broadcast, dev->addr_len); 315 } 316 if (dev->hard_header_cache) 317 neigh->ops = &arp_hh_ops; 318 else 319 neigh->ops = &arp_generic_ops; 320 if (neigh->nud_state&NUD_VALID) 321 neigh->output = neigh->ops->connected_output; 322 else 323 neigh->output = neigh->ops->output; 324 } 325 return 0; 326} 327 328static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb) 329{ 330 dst_link_failure(skb); 331 kfree_skb(skb); 332} 333 334static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb) 335{ 336 __be32 saddr = 0; 337 u8 *dst_ha = NULL; 338 struct net_device *dev = neigh->dev; 339 __be32 target = *(__be32*)neigh->primary_key; 340 int probes = atomic_read(&neigh->probes); 341 struct in_device *in_dev = in_dev_get(dev); 342 343 if (!in_dev) 344 return; 345 346 switch (IN_DEV_ARP_ANNOUNCE(in_dev)) { 347 default: 348 case 0: /* By default announce any local IP */ 349 if (skb && inet_addr_type(ip_hdr(skb)->saddr) == RTN_LOCAL) 350 saddr = ip_hdr(skb)->saddr; 351 break; 352 case 1: /* Restrict announcements of saddr in same subnet */ 353 if (!skb) 354 break; 355 saddr = ip_hdr(skb)->saddr; 356 if (inet_addr_type(saddr) == RTN_LOCAL) { 357 /* saddr should be known to target */ 358 if (inet_addr_onlink(in_dev, target, saddr)) 359 break; 360 } 361 saddr = 0; 362 break; 363 case 2: /* Avoid secondary IPs, get a primary/preferred one */ 364 break; 365 } 366 367 if (in_dev) 368 in_dev_put(in_dev); 369 if (!saddr) 370 saddr = inet_select_addr(dev, target, RT_SCOPE_LINK); 371 372 if ((probes -= neigh->parms->ucast_probes) < 0) { 373 if (!(neigh->nud_state&NUD_VALID)) 374 printk(KERN_DEBUG "trying to ucast probe in NUD_INVALID\n"); 375 dst_ha = neigh->ha; 376 read_lock_bh(&neigh->lock); 377 } else if ((probes -= neigh->parms->app_probes) < 0) { 378#ifdef CONFIG_ARPD 379 neigh_app_ns(neigh); 380#endif 381 return; 382 } 383 384 arp_send(ARPOP_REQUEST, ETH_P_ARP, target, dev, saddr, 385 dst_ha, dev->dev_addr, NULL); 386 if (dst_ha) 387 read_unlock_bh(&neigh->lock); 388} 389 390static int arp_ignore(struct in_device *in_dev, struct net_device *dev, 391 __be32 sip, __be32 tip) 392{ 393 int scope; 394 395 switch (IN_DEV_ARP_IGNORE(in_dev)) { 396 case 0: /* Reply, the tip is already validated */ 397 return 0; 398 case 1: /* Reply only if tip is configured on the incoming interface */ 399 sip = 0; 400 scope = RT_SCOPE_HOST; 401 break; 402 case 2: /* 403 * Reply only if tip is configured on the incoming interface 404 * and is in same subnet as sip 405 */ 406 scope = RT_SCOPE_HOST; 407 break; 408 case 3: /* Do not reply for scope host addresses */ 409 sip = 0; 410 scope = RT_SCOPE_LINK; 411 dev = NULL; 412 break; 413 case 4: /* Reserved */ 414 case 5: 415 case 6: 416 case 7: 417 return 0; 418 case 8: /* Do not reply */ 419 return 1; 420 default: 421 return 0; 422 } 423 return !inet_confirm_addr(dev, sip, tip, scope); 424} 425 426static int arp_filter(__be32 sip, __be32 tip, struct net_device *dev) 427{ 428 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = sip, 429 .saddr = tip } } }; 430 struct rtable *rt; 431 int flag = 0; 432 /*unsigned long now; */ 433 434 if (ip_route_output_key(&rt, &fl) < 0) 435 return 1; 436 if (rt->u.dst.dev != dev) { 437 NET_INC_STATS_BH(LINUX_MIB_ARPFILTER); 438 flag = 1; 439 } 440 ip_rt_put(rt); 441 return flag; 442} 443 444/* OBSOLETE FUNCTIONS */ 445 446/* 447 * Find an arp mapping in the cache. If not found, post a request. 448 * 449 * It is very UGLY routine: it DOES NOT use skb->dst->neighbour, 450 * even if it exists. It is supposed that skb->dev was mangled 451 * by a virtual device (eql, shaper). Nobody but broken devices 452 * is allowed to use this function, it is scheduled to be removed. --ANK 453 */ 454 455static int arp_set_predefined(int addr_hint, unsigned char * haddr, __be32 paddr, struct net_device * dev) 456{ 457 switch (addr_hint) { 458 case RTN_LOCAL: 459 printk(KERN_DEBUG "ARP: arp called for own IP address\n"); 460 memcpy(haddr, dev->dev_addr, dev->addr_len); 461 return 1; 462 case RTN_MULTICAST: 463 arp_mc_map(paddr, haddr, dev, 1); 464 return 1; 465 case RTN_BROADCAST: 466 memcpy(haddr, dev->broadcast, dev->addr_len); 467 return 1; 468 } 469 return 0; 470} 471 472 473int arp_find(unsigned char *haddr, struct sk_buff *skb) 474{ 475 struct net_device *dev = skb->dev; 476 __be32 paddr; 477 struct neighbour *n; 478 479 if (!skb->dst) { 480 printk(KERN_DEBUG "arp_find is called with dst==NULL\n"); 481 kfree_skb(skb); 482 return 1; 483 } 484 485 paddr = ((struct rtable*)skb->dst)->rt_gateway; 486 487 if (arp_set_predefined(inet_addr_type(paddr), haddr, paddr, dev)) 488 return 0; 489 490 n = __neigh_lookup(&arp_tbl, &paddr, dev, 1); 491 492 if (n) { 493 n->used = jiffies; 494 if (n->nud_state&NUD_VALID || neigh_event_send(n, skb) == 0) { 495 read_lock_bh(&n->lock); 496 memcpy(haddr, n->ha, dev->addr_len); 497 read_unlock_bh(&n->lock); 498 neigh_release(n); 499 return 0; 500 } 501 neigh_release(n); 502 } else 503 kfree_skb(skb); 504 return 1; 505} 506 507/* END OF OBSOLETE FUNCTIONS */ 508 509int arp_bind_neighbour(struct dst_entry *dst) 510{ 511 struct net_device *dev = dst->dev; 512 struct neighbour *n = dst->neighbour; 513 514 if (dev == NULL) 515 return -EINVAL; 516 if (n == NULL) { 517 __be32 nexthop = ((struct rtable*)dst)->rt_gateway; 518 if (dev->flags&(IFF_LOOPBACK|IFF_POINTOPOINT)) 519 nexthop = 0; 520 n = __neigh_lookup_errno( 521#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE) 522 dev->type == ARPHRD_ATM ? clip_tbl_hook : 523#endif 524 &arp_tbl, &nexthop, dev); 525 if (IS_ERR(n)) 526 return PTR_ERR(n); 527 dst->neighbour = n; 528 } 529 return 0; 530} 531 532/* 533 * Check if we can use proxy ARP for this path 534 */ 535 536static inline int arp_fwd_proxy(struct in_device *in_dev, struct rtable *rt) 537{ 538 struct in_device *out_dev; 539 int imi, omi = -1; 540 541 if (!IN_DEV_PROXY_ARP(in_dev)) 542 return 0; 543 544 if ((imi = IN_DEV_MEDIUM_ID(in_dev)) == 0) 545 return 1; 546 if (imi == -1) 547 return 0; 548 549 /* place to check for proxy_arp for routes */ 550 551 if ((out_dev = in_dev_get(rt->u.dst.dev)) != NULL) { 552 omi = IN_DEV_MEDIUM_ID(out_dev); 553 in_dev_put(out_dev); 554 } 555 return (omi != imi && omi != -1); 556} 557 558/* 559 * Interface to link layer: send routine and receive handler. 560 */ 561 562/* 563 * Create an arp packet. If (dest_hw == NULL), we create a broadcast 564 * message. 565 */ 566struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, 567 struct net_device *dev, __be32 src_ip, 568 unsigned char *dest_hw, unsigned char *src_hw, 569 unsigned char *target_hw) 570{ 571 struct sk_buff *skb; 572 struct arphdr *arp; 573 unsigned char *arp_ptr; 574 575 /* 576 * Allocate a buffer 577 */ 578 579 skb = alloc_skb(sizeof(struct arphdr)+ 2*(dev->addr_len+4) 580 + LL_RESERVED_SPACE(dev), GFP_ATOMIC); 581 if (skb == NULL) 582 return NULL; 583 584 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 585 skb_reset_network_header(skb); 586 arp = (struct arphdr *) skb_put(skb,sizeof(struct arphdr) + 2*(dev->addr_len+4)); 587 skb->dev = dev; 588 skb->protocol = htons(ETH_P_ARP); 589 if (src_hw == NULL) 590 src_hw = dev->dev_addr; 591 if (dest_hw == NULL) 592 dest_hw = dev->broadcast; 593 594 /* 595 * Fill the device header for the ARP frame 596 */ 597 if (dev->hard_header && 598 dev->hard_header(skb,dev,ptype,dest_hw,src_hw,skb->len) < 0) 599 goto out; 600 601 /* 602 * Fill out the arp protocol part. 603 * 604 * The arp hardware type should match the device type, except for FDDI, 605 * which (according to RFC 1390) should always equal 1 (Ethernet). 606 */ 607 /* 608 * Exceptions everywhere. AX.25 uses the AX.25 PID value not the 609 * DIX code for the protocol. Make these device structure fields. 610 */ 611 switch (dev->type) { 612 default: 613 arp->ar_hrd = htons(dev->type); 614 arp->ar_pro = htons(ETH_P_IP); 615 break; 616 617#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 618 case ARPHRD_AX25: 619 arp->ar_hrd = htons(ARPHRD_AX25); 620 arp->ar_pro = htons(AX25_P_IP); 621 break; 622 623#if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE) 624 case ARPHRD_NETROM: 625 arp->ar_hrd = htons(ARPHRD_NETROM); 626 arp->ar_pro = htons(AX25_P_IP); 627 break; 628#endif 629#endif 630 631#ifdef CONFIG_FDDI 632 case ARPHRD_FDDI: 633 arp->ar_hrd = htons(ARPHRD_ETHER); 634 arp->ar_pro = htons(ETH_P_IP); 635 break; 636#endif 637#ifdef CONFIG_TR 638 case ARPHRD_IEEE802_TR: 639 arp->ar_hrd = htons(ARPHRD_IEEE802); 640 arp->ar_pro = htons(ETH_P_IP); 641 break; 642#endif 643 } 644 645 arp->ar_hln = dev->addr_len; 646 arp->ar_pln = 4; 647 arp->ar_op = htons(type); 648 649 arp_ptr=(unsigned char *)(arp+1); 650 651 memcpy(arp_ptr, src_hw, dev->addr_len); 652 arp_ptr+=dev->addr_len; 653 memcpy(arp_ptr, &src_ip,4); 654 arp_ptr+=4; 655 if (target_hw != NULL) 656 memcpy(arp_ptr, target_hw, dev->addr_len); 657 else 658 memset(arp_ptr, 0, dev->addr_len); 659 arp_ptr+=dev->addr_len; 660 memcpy(arp_ptr, &dest_ip, 4); 661 662 return skb; 663 664out: 665 kfree_skb(skb); 666 return NULL; 667} 668 669/* 670 * Send an arp packet. 671 */ 672void arp_xmit(struct sk_buff *skb) 673{ 674 /* Send it off, maybe filter it using firewalling first. */ 675 NF_HOOK(NF_ARP, NF_ARP_OUT, skb, NULL, skb->dev, dev_queue_xmit); 676} 677 678/* 679 * Create and send an arp packet. 680 */ 681void arp_send(int type, int ptype, __be32 dest_ip, 682 struct net_device *dev, __be32 src_ip, 683 unsigned char *dest_hw, unsigned char *src_hw, 684 unsigned char *target_hw) 685{ 686 struct sk_buff *skb; 687 688 /* 689 * No arp on this interface. 690 */ 691 692 if (dev->flags&IFF_NOARP) 693 return; 694 /* Foxconn added start pling 03/25/2011 */ 695 /* If we are using auto IP, the ARP reply should be in Broadcast */ 696 if (type == ARPOP_REPLY && 697 ((htonl(src_ip) & 0xFFFF0000) == 0xa9fe0000)) 698 skb = arp_create(type, ptype, dest_ip, dev, src_ip, 699 NULL, src_hw, target_hw); 700 else 701 /* Foxconn added end pling 03/25/2011 */ 702 703 skb = arp_create(type, ptype, dest_ip, dev, src_ip, 704 dest_hw, src_hw, target_hw); 705 if (skb == NULL) { 706 return; 707 } 708 709 arp_xmit(skb); 710} 711 712/* 713 * Process an arp request. 714 */ 715 716static int arp_process(struct sk_buff *skb) 717{ 718 struct net_device *dev = skb->dev; 719 /* foxconn wklin added, 2010/06/15 @attach_dev */ 720 struct net_device *bridge_indev = NULL; 721 struct in_device *in_dev = in_dev_get(dev); 722 struct arphdr *arp; 723 unsigned char *arp_ptr; 724 struct rtable *rt; 725 unsigned char *sha, *tha; 726 __be32 sip, tip; 727 u16 dev_type = dev->type; 728 int addr_type; 729 struct neighbour *n; 730 731 /* arp_rcv below verifies the ARP header and verifies the device 732 * is ARP'able. 733 */ 734 735 if (in_dev == NULL) 736 goto out; 737 738 /* foxconn wklin added, 2010/06/15 @attach_dev */ 739 bridge_indev = *(pp_bridge_indev(skb)); 740 arp = arp_hdr(skb); 741 742 switch (dev_type) { 743 default: 744 if (arp->ar_pro != htons(ETH_P_IP) || 745 htons(dev_type) != arp->ar_hrd) 746 goto out; 747 break; 748#ifdef CONFIG_NET_ETHERNET 749 case ARPHRD_ETHER: 750#endif 751#ifdef CONFIG_TR 752 case ARPHRD_IEEE802_TR: 753#endif 754#ifdef CONFIG_FDDI 755 case ARPHRD_FDDI: 756#endif 757#ifdef CONFIG_NET_FC 758 case ARPHRD_IEEE802: 759#endif 760#if defined(CONFIG_NET_ETHERNET) || defined(CONFIG_TR) || defined(CONFIG_FDDI) || \ 761 defined(CONFIG_NET_FC) 762 /* 763 * ETHERNET, Token Ring and Fibre Channel (which are IEEE 802 764 * devices, according to RFC 2625) devices will accept ARP 765 * hardware types of either 1 (Ethernet) or 6 (IEEE 802.2). 766 * This is the case also of FDDI, where the RFC 1390 says that 767 * FDDI devices should accept ARP hardware of (1) Ethernet, 768 * however, to be more robust, we'll accept both 1 (Ethernet) 769 * or 6 (IEEE 802.2) 770 */ 771 if ((arp->ar_hrd != htons(ARPHRD_ETHER) && 772 arp->ar_hrd != htons(ARPHRD_IEEE802)) || 773 arp->ar_pro != htons(ETH_P_IP)) 774 goto out; 775 break; 776#endif 777#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 778 case ARPHRD_AX25: 779 if (arp->ar_pro != htons(AX25_P_IP) || 780 arp->ar_hrd != htons(ARPHRD_AX25)) 781 goto out; 782 break; 783#if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE) 784 case ARPHRD_NETROM: 785 if (arp->ar_pro != htons(AX25_P_IP) || 786 arp->ar_hrd != htons(ARPHRD_NETROM)) 787 goto out; 788 break; 789#endif 790#endif 791 } 792 793 /* Understand only these message types */ 794 795 if (arp->ar_op != htons(ARPOP_REPLY) && 796 arp->ar_op != htons(ARPOP_REQUEST)) 797 goto out; 798 799/* 800 * Extract fields 801 */ 802 arp_ptr= (unsigned char *)(arp+1); 803 sha = arp_ptr; 804 arp_ptr += dev->addr_len; 805 memcpy(&sip, arp_ptr, 4); 806 arp_ptr += 4; 807 tha = arp_ptr; 808 arp_ptr += dev->addr_len; 809 memcpy(&tip, arp_ptr, 4); 810/* 811 * Check for bad requests for 127.x.x.x and requests for multicast 812 * addresses. If this is one such, delete it. 813 */ 814 if (LOOPBACK(tip) || MULTICAST(tip)) 815 goto out; 816 817/* 818 * Special case: We must set Frame Relay source Q.922 address 819 */ 820 if (dev_type == ARPHRD_DLCI) 821 sha = dev->broadcast; 822 823/* 824 * Process entry. The idea here is we want to send a reply if it is a 825 * request for us or if it is a request for someone else that we hold 826 * a proxy for. We want to add an entry to our cache if it is a reply 827 * to us or if it is a request for our address. 828 * (The assumption for this last is that if someone is requesting our 829 * address, they are probably intending to talk to us, so it saves time 830 * if we cache their address. Their address is also probably not in 831 * our cache, since ours is not in their cache.) 832 * 833 * Putting this another way, we only care about replies if they are to 834 * us, in which case we add them to the cache. For requests, we care 835 * about those for us and those for our proxies. We reply to both, 836 * and in the case of requests for us we add the requester to the arp 837 * cache. 838 */ 839 840 /* Special case: IPv4 duplicate address detection packet (RFC2131) */ 841 if (sip == 0) { 842 if (arp->ar_op == htons(ARPOP_REQUEST) && 843 inet_addr_type(tip) == RTN_LOCAL && 844 !arp_ignore(in_dev,dev,sip,tip)) 845 arp_send(ARPOP_REPLY,ETH_P_ARP,tip,dev,tip,sha,dev->dev_addr,dev->dev_addr); 846 goto out; 847 } 848 849 /* foxconn wklin modified sart, 02/02/2007 */ 850#define ATTADEV 851#ifdef ATTADEV 852 if ((arp->ar_op == htons(ARPOP_REQUEST) || arp->ar_op == htons(ARPOP_REPLY)) 853 && inet_addr_type(sip)==RTN_UNICAST && memcmp(dev->name,"br0", 3) == 0) { 854 /* foxconn wklin modified start, 2010/06/15 @attach_dev */ 855 //static int attadev_update(u32 sip, char *sha, struct net_device *indev); 856 attadev_update(sip, sha, bridge_indev); 857 /* foxconn wklin modified end, 2010/06/15 */ 858 } 859#endif 860#ifdef INCLUDE_DETECT_AP_MODE 861if ((arp->ar_op == htons(ARPOP_REQUEST) || arp->ar_op == htons(ARPOP_REPLY)) 862 && inet_addr_type(sip)==RTN_UNICAST && (memcmp(dev->name,"eth0", 4) == 0||memcmp(dev->name,"vlan2", 5) == 0)) { 863 wandev_update(sip, sha, bridge_indev); 864 } 865#endif 866 /* foxconn wklin modified end, 02/02/2007 */ 867 868 if (arp->ar_op == htons(ARPOP_REQUEST) && 869 ip_route_input(skb, tip, sip, 0, dev) == 0) { 870 871 rt = (struct rtable*)skb->dst; 872 addr_type = rt->rt_type; 873 874 if (addr_type == RTN_LOCAL) { 875 n = neigh_event_ns(&arp_tbl, sha, &sip, dev); 876 if (n) { 877 int dont_send = 0; 878 879 if (!dont_send) 880 dont_send |= arp_ignore(in_dev,dev,sip,tip); 881 if (!dont_send && IN_DEV_ARPFILTER(in_dev)) 882 dont_send |= arp_filter(sip,tip,dev); 883 if (!dont_send) 884 arp_send(ARPOP_REPLY,ETH_P_ARP,sip,dev,tip,sha,dev->dev_addr,sha); 885 886 neigh_release(n); 887 } 888 goto out; 889 } else if (IN_DEV_FORWARD(in_dev)) { 890 if ((rt->rt_flags&RTCF_DNAT) || 891 (addr_type == RTN_UNICAST && rt->u.dst.dev != dev && 892 (arp_fwd_proxy(in_dev, rt) || pneigh_lookup(&arp_tbl, &tip, dev, 0)))) { 893 n = neigh_event_ns(&arp_tbl, sha, &sip, dev); 894 if (n) 895 neigh_release(n); 896 897 if (NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED || 898 skb->pkt_type == PACKET_HOST || 899 in_dev->arp_parms->proxy_delay == 0) { 900 arp_send(ARPOP_REPLY,ETH_P_ARP,sip,dev,tip,sha,dev->dev_addr,sha); 901 } else { 902 pneigh_enqueue(&arp_tbl, in_dev->arp_parms, skb); 903 in_dev_put(in_dev); 904 return 0; 905 } 906 goto out; 907 } 908 } 909 } 910 911 /* Update our ARP tables */ 912 913 n = __neigh_lookup(&arp_tbl, &sip, dev, 0); 914 915 if (IPV4_DEVCONF_ALL(ARP_ACCEPT)) { 916 /* Unsolicited ARP is not accepted by default. 917 It is possible, that this option should be enabled for some 918 devices (strip is candidate) 919 */ 920 if (n == NULL && 921 arp->ar_op == htons(ARPOP_REPLY) && 922 inet_addr_type(sip) == RTN_UNICAST) 923 n = __neigh_lookup(&arp_tbl, &sip, dev, -1); 924 } 925 926 if (n) { 927 int state = NUD_REACHABLE; 928 int override; 929 930 /* If several different ARP replies follows back-to-back, 931 use the FIRST one. It is possible, if several proxy 932 agents are active. Taking the first reply prevents 933 arp trashing and chooses the fastest router. 934 */ 935 override = time_after(jiffies, n->updated + n->parms->locktime); 936 937 /* Broadcast replies and request packets 938 do not assert neighbour reachability. 939 */ 940 if (arp->ar_op != htons(ARPOP_REPLY) || 941 skb->pkt_type != PACKET_HOST) 942 state = NUD_STALE; 943 neigh_update(n, sha, state, override ? NEIGH_UPDATE_F_OVERRIDE : 0); 944 neigh_release(n); 945 } 946 947out: 948 if (in_dev) 949 in_dev_put(in_dev); 950 kfree_skb(skb); 951 return 0; 952} 953 954static void parp_redo(struct sk_buff *skb) 955{ 956 arp_process(skb); 957} 958 959 960/* 961 * Receive an arp request from the device layer. 962 */ 963 964static int arp_rcv(struct sk_buff *skb, struct net_device *dev, 965 struct packet_type *pt, struct net_device *orig_dev) 966{ 967 struct arphdr *arp; 968 969 /* ARP header, plus 2 device addresses, plus 2 IP addresses. */ 970 if (!pskb_may_pull(skb, (sizeof(struct arphdr) + 971 (2 * dev->addr_len) + 972 (2 * sizeof(u32))))) 973 goto freeskb; 974 975 arp = arp_hdr(skb); 976 if (arp->ar_hln != dev->addr_len || 977 dev->flags & IFF_NOARP || 978 skb->pkt_type == PACKET_OTHERHOST || 979 skb->pkt_type == PACKET_LOOPBACK || 980 arp->ar_pln != 4) 981 goto freeskb; 982 983 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 984 goto out_of_mem; 985 986 memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); 987 988 return NF_HOOK(NF_ARP, NF_ARP_IN, skb, dev, NULL, arp_process); 989 990freeskb: 991 kfree_skb(skb); 992out_of_mem: 993 return 0; 994} 995 996/* 997 * User level interface (ioctl) 998 */ 999 1000/* 1001 * Set (create) an ARP cache entry. 1002 */ 1003 1004static int arp_req_set(struct arpreq *r, struct net_device * dev) 1005{ 1006 __be32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr; 1007 struct neighbour *neigh; 1008 int err; 1009 1010 if (r->arp_flags&ATF_PUBL) { 1011 __be32 mask = ((struct sockaddr_in *) &r->arp_netmask)->sin_addr.s_addr; 1012 if (mask && mask != htonl(0xFFFFFFFF)) 1013 return -EINVAL; 1014 if (!dev && (r->arp_flags & ATF_COM)) { 1015 dev = dev_getbyhwaddr(r->arp_ha.sa_family, r->arp_ha.sa_data); 1016 if (!dev) 1017 return -ENODEV; 1018 } 1019 if (mask) { 1020 if (pneigh_lookup(&arp_tbl, &ip, dev, 1) == NULL) 1021 return -ENOBUFS; 1022 return 0; 1023 } 1024 if (dev == NULL) { 1025 IPV4_DEVCONF_ALL(PROXY_ARP) = 1; 1026 return 0; 1027 } 1028 if (__in_dev_get_rtnl(dev)) { 1029 IN_DEV_CONF_SET(__in_dev_get_rtnl(dev), PROXY_ARP, 1); 1030 return 0; 1031 } 1032 return -ENXIO; 1033 } 1034 1035 if (r->arp_flags & ATF_PERM) 1036 r->arp_flags |= ATF_COM; 1037 if (dev == NULL) { 1038 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, 1039 .tos = RTO_ONLINK } } }; 1040 struct rtable * rt; 1041 if ((err = ip_route_output_key(&rt, &fl)) != 0) 1042 return err; 1043 dev = rt->u.dst.dev; 1044 ip_rt_put(rt); 1045 if (!dev) 1046 return -EINVAL; 1047 } 1048 switch (dev->type) { 1049#ifdef CONFIG_FDDI 1050 case ARPHRD_FDDI: 1051 /* 1052 * According to RFC 1390, FDDI devices should accept ARP 1053 * hardware types of 1 (Ethernet). However, to be more 1054 * robust, we'll accept hardware types of either 1 (Ethernet) 1055 * or 6 (IEEE 802.2). 1056 */ 1057 if (r->arp_ha.sa_family != ARPHRD_FDDI && 1058 r->arp_ha.sa_family != ARPHRD_ETHER && 1059 r->arp_ha.sa_family != ARPHRD_IEEE802) 1060 return -EINVAL; 1061 break; 1062#endif 1063 default: 1064 if (r->arp_ha.sa_family != dev->type) 1065 return -EINVAL; 1066 break; 1067 } 1068 1069 neigh = __neigh_lookup_errno(&arp_tbl, &ip, dev); 1070 err = PTR_ERR(neigh); 1071 if (!IS_ERR(neigh)) { 1072 unsigned state = NUD_STALE; 1073 if (r->arp_flags & ATF_PERM) 1074 state = NUD_PERMANENT; 1075 err = neigh_update(neigh, (r->arp_flags&ATF_COM) ? 1076 r->arp_ha.sa_data : NULL, state, 1077 NEIGH_UPDATE_F_OVERRIDE| 1078 NEIGH_UPDATE_F_ADMIN); 1079 neigh_release(neigh); 1080 } 1081 return err; 1082} 1083 1084static unsigned arp_state_to_flags(struct neighbour *neigh) 1085{ 1086 unsigned flags = 0; 1087 if (neigh->nud_state&NUD_PERMANENT) 1088 flags = ATF_PERM|ATF_COM; 1089 else if (neigh->nud_state&NUD_VALID) 1090 flags = ATF_COM; 1091 return flags; 1092} 1093 1094/* 1095 * Get an ARP cache entry. 1096 */ 1097 1098static int arp_req_get(struct arpreq *r, struct net_device *dev) 1099{ 1100 __be32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr; 1101 struct neighbour *neigh; 1102 int err = -ENXIO; 1103 1104 neigh = neigh_lookup(&arp_tbl, &ip, dev); 1105 if (neigh) { 1106 read_lock_bh(&neigh->lock); 1107 memcpy(r->arp_ha.sa_data, neigh->ha, dev->addr_len); 1108 r->arp_flags = arp_state_to_flags(neigh); 1109 read_unlock_bh(&neigh->lock); 1110 r->arp_ha.sa_family = dev->type; 1111 strlcpy(r->arp_dev, dev->name, sizeof(r->arp_dev)); 1112 neigh_release(neigh); 1113 err = 0; 1114 } 1115 return err; 1116} 1117 1118static int arp_req_delete(struct arpreq *r, struct net_device * dev) 1119{ 1120 int err; 1121 __be32 ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr; 1122 struct neighbour *neigh; 1123 1124 if (r->arp_flags & ATF_PUBL) { 1125 __be32 mask = 1126 ((struct sockaddr_in *)&r->arp_netmask)->sin_addr.s_addr; 1127 if (mask == htonl(0xFFFFFFFF)) 1128 return pneigh_delete(&arp_tbl, &ip, dev); 1129 if (mask == 0) { 1130 if (dev == NULL) { 1131 IPV4_DEVCONF_ALL(PROXY_ARP) = 0; 1132 return 0; 1133 } 1134 if (__in_dev_get_rtnl(dev)) { 1135 IN_DEV_CONF_SET(__in_dev_get_rtnl(dev), 1136 PROXY_ARP, 0); 1137 return 0; 1138 } 1139 return -ENXIO; 1140 } 1141 return -EINVAL; 1142 } 1143 1144 if (dev == NULL) { 1145 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, 1146 .tos = RTO_ONLINK } } }; 1147 struct rtable * rt; 1148 if ((err = ip_route_output_key(&rt, &fl)) != 0) 1149 return err; 1150 dev = rt->u.dst.dev; 1151 ip_rt_put(rt); 1152 if (!dev) 1153 return -EINVAL; 1154 } 1155 err = -ENXIO; 1156 neigh = neigh_lookup(&arp_tbl, &ip, dev); 1157 if (neigh) { 1158 if (neigh->nud_state&~NUD_NOARP) 1159 err = neigh_update(neigh, NULL, NUD_FAILED, 1160 NEIGH_UPDATE_F_OVERRIDE| 1161 NEIGH_UPDATE_F_ADMIN); 1162 neigh_release(neigh); 1163 } 1164 return err; 1165} 1166 1167/* 1168 * Handle an ARP layer I/O control request. 1169 */ 1170 1171int arp_ioctl(unsigned int cmd, void __user *arg) 1172{ 1173 int err; 1174 struct arpreq r; 1175 struct net_device *dev = NULL; 1176 1177 switch (cmd) { 1178 case SIOCDARP: 1179 case SIOCSARP: 1180 if (!capable(CAP_NET_ADMIN)) 1181 return -EPERM; 1182 case SIOCGARP: 1183 err = copy_from_user(&r, arg, sizeof(struct arpreq)); 1184 if (err) 1185 return -EFAULT; 1186 break; 1187 default: 1188 return -EINVAL; 1189 } 1190 1191 if (r.arp_pa.sa_family != AF_INET) 1192 return -EPFNOSUPPORT; 1193 1194 if (!(r.arp_flags & ATF_PUBL) && 1195 (r.arp_flags & (ATF_NETMASK|ATF_DONTPUB))) 1196 return -EINVAL; 1197 if (!(r.arp_flags & ATF_NETMASK)) 1198 ((struct sockaddr_in *)&r.arp_netmask)->sin_addr.s_addr = 1199 htonl(0xFFFFFFFFUL); 1200 rtnl_lock(); 1201 if (r.arp_dev[0]) { 1202 err = -ENODEV; 1203 if ((dev = __dev_get_by_name(r.arp_dev)) == NULL) 1204 goto out; 1205 1206 /* Mmmm... It is wrong... ARPHRD_NETROM==0 */ 1207 if (!r.arp_ha.sa_family) 1208 r.arp_ha.sa_family = dev->type; 1209 err = -EINVAL; 1210 if ((r.arp_flags & ATF_COM) && r.arp_ha.sa_family != dev->type) 1211 goto out; 1212 } else if (cmd == SIOCGARP) { 1213 err = -ENODEV; 1214 goto out; 1215 } 1216 1217 switch (cmd) { 1218 case SIOCDARP: 1219 err = arp_req_delete(&r, dev); 1220 break; 1221 case SIOCSARP: 1222 err = arp_req_set(&r, dev); 1223 break; 1224 case SIOCGARP: 1225 err = arp_req_get(&r, dev); 1226 if (!err && copy_to_user(arg, &r, sizeof(r))) 1227 err = -EFAULT; 1228 break; 1229 } 1230out: 1231 rtnl_unlock(); 1232 return err; 1233} 1234 1235static int arp_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) 1236{ 1237 struct net_device *dev = ptr; 1238 1239 switch (event) { 1240 case NETDEV_CHANGEADDR: 1241 neigh_changeaddr(&arp_tbl, dev); 1242 rt_cache_flush(0); 1243 break; 1244 default: 1245 break; 1246 } 1247 1248 return NOTIFY_DONE; 1249} 1250 1251static struct notifier_block arp_netdev_notifier = { 1252 .notifier_call = arp_netdev_event, 1253}; 1254 1255/* Note, that it is not on notifier chain. 1256 It is necessary, that this routine was called after route cache will be 1257 flushed. 1258 */ 1259void arp_ifdown(struct net_device *dev) 1260{ 1261 neigh_ifdown(&arp_tbl, dev); 1262} 1263 1264 1265/* 1266 * Called once on startup. 1267 */ 1268 1269static struct packet_type arp_packet_type = { 1270 .type = __constant_htons(ETH_P_ARP), 1271 .func = arp_rcv, 1272}; 1273 1274static int arp_proc_init(void); 1275 1276void __init arp_init(void) 1277{ 1278 neigh_table_init(&arp_tbl); 1279 1280 dev_add_pack(&arp_packet_type); 1281 arp_proc_init(); 1282 /* wklin added start, 01/08/2007, for attadev */ 1283#ifdef ATTADEV 1284 { 1285 //static int attadev_init(void); 1286 attadev_init(); 1287 } 1288#endif 1289#if INCLUDE_DETECT_AP_MODE 1290 { 1291 wandev_init(); 1292 } 1293#endif 1294 /* wklin added end, 01/08/2007 */ 1295 1296#ifdef CONFIG_SYSCTL 1297 neigh_sysctl_register(NULL, &arp_tbl.parms, NET_IPV4, 1298 NET_IPV4_NEIGH, "ipv4", NULL, NULL); 1299#endif 1300 register_netdevice_notifier(&arp_netdev_notifier); 1301} 1302 1303#ifdef CONFIG_PROC_FS 1304#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 1305 1306/* ------------------------------------------------------------------------ */ 1307/* 1308 * ax25 -> ASCII conversion 1309 */ 1310static char *ax2asc2(ax25_address *a, char *buf) 1311{ 1312 char c, *s; 1313 int n; 1314 1315 for (n = 0, s = buf; n < 6; n++) { 1316 c = (a->ax25_call[n] >> 1) & 0x7F; 1317 1318 if (c != ' ') *s++ = c; 1319 } 1320 1321 *s++ = '-'; 1322 1323 if ((n = ((a->ax25_call[6] >> 1) & 0x0F)) > 9) { 1324 *s++ = '1'; 1325 n -= 10; 1326 } 1327 1328 *s++ = n + '0'; 1329 *s++ = '\0'; 1330 1331 if (*buf == '\0' || *buf == '-') 1332 return "*"; 1333 1334 return buf; 1335 1336} 1337#endif /* CONFIG_AX25 */ 1338 1339#define HBUFFERLEN 30 1340 1341static void arp_format_neigh_entry(struct seq_file *seq, 1342 struct neighbour *n) 1343{ 1344 char hbuffer[HBUFFERLEN]; 1345 const char hexbuf[] = "0123456789ABCDEF"; 1346 int k, j; 1347 char tbuf[16]; 1348 struct net_device *dev = n->dev; 1349 int hatype = dev->type; 1350 1351 read_lock(&n->lock); 1352 /* Convert hardware address to XX:XX:XX:XX ... form. */ 1353#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 1354 if (hatype == ARPHRD_AX25 || hatype == ARPHRD_NETROM) 1355 ax2asc2((ax25_address *)n->ha, hbuffer); 1356 else { 1357#endif 1358 for (k = 0, j = 0; k < HBUFFERLEN - 3 && j < dev->addr_len; j++) { 1359 hbuffer[k++] = hexbuf[(n->ha[j] >> 4) & 15]; 1360 hbuffer[k++] = hexbuf[n->ha[j] & 15]; 1361 hbuffer[k++] = ':'; 1362 } 1363 hbuffer[--k] = 0; 1364#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) 1365 } 1366#endif 1367 sprintf(tbuf, "%u.%u.%u.%u", NIPQUAD(*(u32*)n->primary_key)); 1368 seq_printf(seq, "%-16s 0x%-10x0x%-10x%s * %s\n", 1369 tbuf, hatype, arp_state_to_flags(n), hbuffer, dev->name); 1370 read_unlock(&n->lock); 1371} 1372 1373static void arp_format_pneigh_entry(struct seq_file *seq, 1374 struct pneigh_entry *n) 1375{ 1376 struct net_device *dev = n->dev; 1377 int hatype = dev ? dev->type : 0; 1378 char tbuf[16]; 1379 1380 sprintf(tbuf, "%u.%u.%u.%u", NIPQUAD(*(u32*)n->key)); 1381 seq_printf(seq, "%-16s 0x%-10x0x%-10x%s * %s\n", 1382 tbuf, hatype, ATF_PUBL | ATF_PERM, "00:00:00:00:00:00", 1383 dev ? dev->name : "*"); 1384} 1385 1386static int arp_seq_show(struct seq_file *seq, void *v) 1387{ 1388 if (v == SEQ_START_TOKEN) { 1389 seq_puts(seq, "IP address HW type Flags " 1390 "HW address Mask Device\n"); 1391 } else { 1392 struct neigh_seq_state *state = seq->private; 1393 1394 if (state->flags & NEIGH_SEQ_IS_PNEIGH) 1395 arp_format_pneigh_entry(seq, v); 1396 else 1397 arp_format_neigh_entry(seq, v); 1398 } 1399 1400 return 0; 1401} 1402 1403static void *arp_seq_start(struct seq_file *seq, loff_t *pos) 1404{ 1405 /* Don't want to confuse "arp -a" w/ magic entries, 1406 * so we tell the generic iterator to skip NUD_NOARP. 1407 */ 1408 return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_SKIP_NOARP); 1409} 1410 1411/* ------------------------------------------------------------------------ */ 1412 1413static const struct seq_operations arp_seq_ops = { 1414 .start = arp_seq_start, 1415 .next = neigh_seq_next, 1416 .stop = neigh_seq_stop, 1417 .show = arp_seq_show, 1418}; 1419 1420static int arp_seq_open(struct inode *inode, struct file *file) 1421{ 1422 struct seq_file *seq; 1423 int rc = -ENOMEM; 1424 struct neigh_seq_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 1425 1426 if (!s) 1427 goto out; 1428 1429 rc = seq_open(file, &arp_seq_ops); 1430 if (rc) 1431 goto out_kfree; 1432 1433 seq = file->private_data; 1434 seq->private = s; 1435out: 1436 return rc; 1437out_kfree: 1438 kfree(s); 1439 goto out; 1440} 1441 1442static const struct file_operations arp_seq_fops = { 1443 .owner = THIS_MODULE, 1444 .open = arp_seq_open, 1445 .read = seq_read, 1446 .llseek = seq_lseek, 1447 .release = seq_release_private, 1448}; 1449 1450static int __init arp_proc_init(void) 1451{ 1452 if (!proc_net_fops_create("arp", S_IRUGO, &arp_seq_fops)) 1453 return -ENOMEM; 1454 return 0; 1455} 1456 1457#else /* CONFIG_PROC_FS */ 1458 1459static int __init arp_proc_init(void) 1460{ 1461 return 0; 1462} 1463 1464#endif /* CONFIG_PROC_FS */ 1465 1466EXPORT_SYMBOL(arp_broken_ops); 1467EXPORT_SYMBOL(arp_find); 1468EXPORT_SYMBOL(arp_create); 1469EXPORT_SYMBOL(arp_xmit); 1470EXPORT_SYMBOL(arp_send); 1471EXPORT_SYMBOL(arp_tbl); 1472 1473#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE) 1474EXPORT_SYMBOL(clip_tbl_hook); 1475#endif 1476 1477/* foxconn wklin added start, 02/06/2007 */ 1478#ifdef ATTADEV 1479#define FLAG_VALID 1 1480#define FLAG_INVALID 0 1481#define MAX_ATTADEV_ENTRY 128 1482#define ATTADEV_HASHMASK 0x7f 1483 1484typedef struct { 1485 u32 sip; 1486 unsigned char sha[6]; 1487 unsigned short flag; 1488 /* foxconn added, 2010/06/15 @attach_dev */ 1489 char ifname[IFNAMSIZ]; 1490} attadev_t; 1491 1492static rwlock_t attadev_lock = RW_LOCK_UNLOCKED; 1493static attadev_t attadevs[MAX_ATTADEV_ENTRY]; 1494static int attadev_get_info(char *buffer, char **start, off_t offset, 1495 int length); 1496static int attadev_del_info(char *buffer, char **start, off_t offset, 1497 int length); 1498 1499static int attadev_init(void) { 1500 int i; 1501 attadev_t *p = &attadevs[0]; 1502 1503 /* init data structure */ 1504 for (i=0; i<MAX_ATTADEV_ENTRY; i++) { 1505 (p+i)->sip = 0; 1506 memset((p+i)->sha,'\0', 6); 1507 (p+i)->flag = FLAG_INVALID; 1508 } 1509 1510 /* create /proc/net/attadev for r/w */ 1511 proc_net_create ("attadev", 0, attadev_get_info); 1512 proc_net_create ("delatta", 0, attadev_del_info); 1513 return 0; 1514} 1515 1516static int attadev_del_info(char *buffer, char **start, off_t offset, int length) 1517{ 1518 attadev_t *p = &attadevs[0]; 1519 int i=0; 1520 1521 write_lock_bh(&attadev_lock); 1522 for (i=0; i<MAX_ATTADEV_ENTRY; i++) { 1523 (p+i)->sip = 0; 1524 memset((p+i)->sha,'\0', 6); 1525 (p+i)->flag = FLAG_INVALID; 1526 } 1527 write_unlock_bh(&attadev_lock); 1528 return 0; 1529} 1530 1531static int attadev_get_info(char *buffer, char **start, off_t offset, int length) 1532{ 1533 attadev_t *p = &attadevs[0]; 1534 int i, size, len=0; 1535 1536 read_lock_bh(&attadev_lock); 1537 for (i=0; i<MAX_ATTADEV_ENTRY; i++) { 1538 if ((p+i)->flag == FLAG_VALID) { 1539 /* foxconn wklin modified start, 2010/06/15 @attach_dev */ 1540 size = sprintf(buffer+len, "%08X %02X:%02X:%02X:%02X:%02X:%02X %s\n", 1541 ntohl((p+i)->sip), 1542 ((p+i)->sha)[0], ((p+i)->sha)[1], ((p+i)->sha)[2], 1543 ((p+i)->sha)[3], ((p+i)->sha)[4], ((p+i)->sha)[5], 1544 (p+i)->ifname); 1545 /* foxconn wklin modified end, 2010/06/15 */ 1546 len+=size; 1547 } 1548 } 1549 read_unlock_bh(&attadev_lock); 1550 1551 if (offset >= len) { 1552 *start = buffer; 1553 return 0; 1554 } 1555 1556 *start = buffer+offset; 1557 len -= offset; 1558 if (len > length) 1559 len = length; 1560 if (len < 0) 1561 len = 0; 1562 return len; 1563} 1564 1565static u32 attadev_hash(u32 *pkey) 1566{ 1567 u32 hash_val; 1568 1569 hash_val = *(u32*)pkey; 1570 hash_val ^= (hash_val>>16); 1571 hash_val ^= hash_val>>8; 1572 hash_val ^= hash_val>>3; 1573 hash_val &= ATTADEV_HASHMASK; 1574 1575 return hash_val; 1576} 1577 1578/* foxconn wklin modified ,2010/06/15 @attach_dev */ 1579static int attadev_update(u32 sip, char *sha, struct net_device *dev) { 1580 int hash_id = attadev_hash(&sip); 1581 int i; 1582 i = hash_id; 1583 attadev_t *p = &attadevs[0]; 1584 1585 /* printk("sip=%08x, hashid = %d\n", sip, hash_id); */ 1586 write_lock_bh(&attadev_lock); 1587 for(;;) { 1588 if ((p+i)->flag == FLAG_INVALID || (p+i)->sip == sip) { 1589 (p+i)->sip = sip; 1590 (p+i)->flag = FLAG_VALID; 1591 memcpy((p+i)->sha, sha, 6); 1592 /* foxconn wklin modified start, 2010/06/15 @attach_dev */ 1593 if (dev && dev->name) { 1594 strcpy((p+i)->ifname, dev->name); 1595 } 1596 /* foxconn wklin modified end, 2010/06/15 */ 1597 break; 1598 } 1599 i++; 1600 if (i >= MAX_ATTADEV_ENTRY) /* foxconn wklin modified, 08/01/2007 */ 1601 i = 0; 1602 if (i == hash_id) { 1603 /* printk("attadev table is full\n"); */ 1604 break; 1605 } 1606 } 1607 write_unlock_bh(&attadev_lock); 1608 return 0; 1609} 1610/*added by dennis start,01/02/2013,@ ap mode detection*/ 1611#ifdef INCLUDE_DETECT_AP_MODE 1612static rwlock_t wandev_lock = RW_LOCK_UNLOCKED; 1613static int wandev_get_info(char *buffer, char **start, off_t offset, 1614 int length); 1615static int wandev_del_info(char *buffer, char **start, off_t offset, 1616 int length); 1617static attadev_t wandevs[MAX_ATTADEV_ENTRY]; 1618 1619static int wandev_init(void) { 1620 int i; 1621 attadev_t *p = &wandevs[0]; 1622 1623 /* init data structure */ 1624 for (i=0; i<MAX_ATTADEV_ENTRY; i++) { 1625 (p+i)->sip = 0; 1626 memset((p+i)->sha,'\0', 6); 1627 (p+i)->flag = FLAG_INVALID; 1628 } 1629 1630 /* create /proc/net/wandev for r/w */ 1631 proc_net_create ("wandev", 0, wandev_get_info); //added by dennis,01/02/2013 1632 proc_net_create ("delwandev", 0, wandev_del_info); //added by dennis,01/02/2013 1633 return 0; 1634} 1635static int wandev_del_info(char *buffer, char **start, off_t offset, int length) 1636{ 1637 attadev_t *p = &wandevs[0]; 1638 int i=0; 1639 1640 write_lock_bh(&wandev_lock); 1641 for (i=0; i<MAX_ATTADEV_ENTRY; i++) { 1642 (p+i)->sip = 0; 1643 memset((p+i)->sha,'\0', 6); 1644 (p+i)->flag = FLAG_INVALID; 1645 } 1646 write_unlock_bh(&wandev_lock); 1647 return 0; 1648} 1649 1650static int wandev_get_info(char *buffer, char **start, off_t offset, int length) 1651{ 1652 attadev_t *p = &wandevs[0]; 1653 int i, size, len=0; 1654 1655 read_lock_bh(&wandev_lock); 1656 for (i=0; i<MAX_ATTADEV_ENTRY; i++) { 1657 if ((p+i)->flag == FLAG_VALID) { 1658 /* foxconn wklin modified start, 2010/06/15 @attach_dev */ 1659 size = sprintf(buffer+len, "%08X %02X:%02X:%02X:%02X:%02X:%02X %s\n", 1660 ntohl((p+i)->sip), 1661 ((p+i)->sha)[0], ((p+i)->sha)[1], ((p+i)->sha)[2], 1662 ((p+i)->sha)[3], ((p+i)->sha)[4], ((p+i)->sha)[5], 1663 (p+i)->ifname); 1664 /* foxconn wklin modified end, 2010/06/15 */ 1665 len+=size; 1666 } 1667 } 1668 read_unlock_bh(&wandev_lock); 1669 1670 if (offset >= len) { 1671 *start = buffer; 1672 return 0; 1673 } 1674 1675 *start = buffer+offset; 1676 len -= offset; 1677 if (len > length) 1678 len = length; 1679 if (len < 0) 1680 len = 0; 1681 return len; 1682} 1683static int wandev_update(u32 sip, char *sha, struct net_device *dev) { 1684 int hash_id = attadev_hash(&sip); 1685 int i; 1686 i = hash_id; 1687 attadev_t *p = &wandevs[0]; 1688 1689 /* printk("sip=%08x, hashid = %d\n", sip, hash_id); */ 1690 write_lock_bh(&wandev_lock); 1691 for(;;) { 1692 if ((p+i)->flag == FLAG_INVALID || (p+i)->sip == sip) { 1693 (p+i)->sip = sip; 1694 (p+i)->flag = FLAG_VALID; 1695 memcpy((p+i)->sha, sha, 6); 1696 /* foxconn wklin modified start, 2010/06/15 @attach_dev */ 1697 if (dev && dev->name) { 1698 strcpy((p+i)->ifname, dev->name); 1699 } 1700 /* foxconn wklin modified end, 2010/06/15 */ 1701 break; 1702 } 1703 i++; 1704 if (i >= MAX_ATTADEV_ENTRY) /* foxconn wklin modified, 08/01/2007 */ 1705 i = 0; 1706 if (i == hash_id) { 1707 /* printk("attadev table is full\n"); */ 1708 break; 1709 } 1710 } 1711 write_unlock_bh(&wandev_lock); 1712 return 0; 1713} 1714#endif /*INCLUDE_DETECT_AP_MODE*/ 1715/*added by dennis end,01/02/2013,@ ap mode detection*/ 1716#endif 1717