target/linux/etrax-2.6/patches/generic_2.6/160-netfilter_route.patch

   1 diff -urN linux-2.6.19.old/include/linux/netfilter_ipv4/ipt_ROUTE.h linux-2.6.19.dev/include/linux/netfilter_ipv4/ipt_ROUTE.h
   2 --- linux-2.6.19.old/include/linux/netfilter_ipv4/ipt_ROUTE.h   1970-01-01 01:00:00.000000000 +0100
   3 +++ linux-2.6.19.dev/include/linux/netfilter_ipv4/ipt_ROUTE.h   2006-12-14 03:13:49.000000000 +0100
   4 @@ -0,0 +1,23 @@
   5 +/* Header file for iptables ipt_ROUTE target
   6 + *
   7 + * (C) 2002 by Cédric de Launois <delaunois@info.ucl.ac.be>
   8 + *
   9 + * This software is distributed under GNU GPL v2, 1991
  10 + */
  11 +#ifndef _IPT_ROUTE_H_target
  12 +#define _IPT_ROUTE_H_target
  13 +
  14 +#define IPT_ROUTE_IFNAMSIZ 16
  15 +
  16 +struct ipt_route_target_info {
  17 +       char      oif[IPT_ROUTE_IFNAMSIZ];      /* Output Interface Name */
  18 +       char      iif[IPT_ROUTE_IFNAMSIZ];      /* Input Interface Name  */
  19 +       u_int32_t gw;                           /* IP address of gateway */
  20 +       u_int8_t  flags;
  21 +};
  22 +
  23 +/* Values for "flags" field */
  24 +#define IPT_ROUTE_CONTINUE        0x01
  25 +#define IPT_ROUTE_TEE             0x02
  26 +
  27 +#endif /*_IPT_ROUTE_H_target*/
  28 diff -urN linux-2.6.19.old/include/linux/netfilter_ipv6/ip6t_ROUTE.h linux-2.6.19.dev/include/linux/netfilter_ipv6/ip6t_ROUTE.h
  29 --- linux-2.6.19.old/include/linux/netfilter_ipv6/ip6t_ROUTE.h  1970-01-01 01:00:00.000000000 +0100
  30 +++ linux-2.6.19.dev/include/linux/netfilter_ipv6/ip6t_ROUTE.h  2006-12-14 03:13:49.000000000 +0100
  31 @@ -0,0 +1,23 @@
  32 +/* Header file for iptables ip6t_ROUTE target
  33 + *
  34 + * (C) 2003 by Cédric de Launois <delaunois@info.ucl.ac.be>
  35 + *
  36 + * This software is distributed under GNU GPL v2, 1991
  37 + */
  38 +#ifndef _IPT_ROUTE_H_target
  39 +#define _IPT_ROUTE_H_target
  40 +
  41 +#define IP6T_ROUTE_IFNAMSIZ 16
  42 +
  43 +struct ip6t_route_target_info {
  44 +       char      oif[IP6T_ROUTE_IFNAMSIZ];     /* Output Interface Name */
  45 +       char      iif[IP6T_ROUTE_IFNAMSIZ];     /* Input Interface Name  */
  46 +       u_int32_t gw[4];                        /* IPv6 address of gateway */
  47 +       u_int8_t  flags;
  48 +};
  49 +
  50 +/* Values for "flags" field */
  51 +#define IP6T_ROUTE_CONTINUE        0x01
  52 +#define IP6T_ROUTE_TEE             0x02
  53 +
  54 +#endif /*_IP6T_ROUTE_H_target*/
  55 diff -urN linux-2.6.19.old/net/ipv4/netfilter/ipt_ROUTE.c linux-2.6.19.dev/net/ipv4/netfilter/ipt_ROUTE.c
  56 --- linux-2.6.19.old/net/ipv4/netfilter/ipt_ROUTE.c     1970-01-01 01:00:00.000000000 +0100
  57 +++ linux-2.6.19.dev/net/ipv4/netfilter/ipt_ROUTE.c     2006-12-14 03:13:49.000000000 +0100
  58 @@ -0,0 +1,455 @@
  59 +/*
  60 + * This implements the ROUTE target, which enables you to setup unusual
  61 + * routes not supported by the standard kernel routing table.
  62 + *
  63 + * Copyright (C) 2002 Cedric de Launois <delaunois@info.ucl.ac.be>
  64 + *
  65 + * v 1.11 2004/11/23
  66 + *
  67 + * This software is distributed under GNU GPL v2, 1991
  68 + */
  69 +
  70 +#include <linux/module.h>
  71 +#include <linux/skbuff.h>
  72 +#include <linux/ip.h>
  73 +#include <linux/netfilter_ipv4/ip_tables.h>
  74 +#include <linux/netfilter_ipv4/ip_conntrack.h>
  75 +#include <linux/netfilter_ipv4/ipt_ROUTE.h>
  76 +#include <linux/netdevice.h>
  77 +#include <linux/route.h>
  78 +#include <linux/if_arp.h>
  79 +#include <net/ip.h>
  80 +#include <net/route.h>
  81 +#include <net/icmp.h>
  82 +#include <net/checksum.h>
  83 +
  84 +#if 0
  85 +#define DEBUGP printk
  86 +#else
  87 +#define DEBUGP(format, args...)
  88 +#endif
  89 +
  90 +MODULE_LICENSE("GPL");
  91 +MODULE_AUTHOR("Cedric de Launois <delaunois@info.ucl.ac.be>");
  92 +MODULE_DESCRIPTION("iptables ROUTE target module");
  93 +
  94 +/* Try to route the packet according to the routing keys specified in
  95 + * route_info. Keys are :
  96 + *  - ifindex :
  97 + *      0 if no oif preferred,
  98 + *      otherwise set to the index of the desired oif
  99 + *  - route_info->gw :
 100 + *      0 if no gateway specified,
 101 + *      otherwise set to the next host to which the pkt must be routed
 102 + * If success, skb->dev is the output device to which the packet must
 103 + * be sent and skb->dst is not NULL
 104 + *
 105 + * RETURN: -1 if an error occured
 106 + *          1 if the packet was succesfully routed to the
 107 + *            destination desired
 108 + *          0 if the kernel routing table could not route the packet
 109 + *            according to the keys specified
 110 + */
 111 +static int route(struct sk_buff *skb,
 112 +                unsigned int ifindex,
 113 +                const struct ipt_route_target_info *route_info)
 114 +{
 115 +       int err;
 116 +       struct rtable *rt;
 117 +       struct iphdr *iph = skb->nh.iph;
 118 +       struct flowi fl = {
 119 +               .oif = ifindex,
 120 +               .nl_u = {
 121 +                       .ip4_u = {
 122 +                               .daddr = iph->daddr,
 123 +                               .saddr = 0,
 124 +                               .tos = RT_TOS(iph->tos),
 125 +                               .scope = RT_SCOPE_UNIVERSE,
 126 +                       }
 127 +               }
 128 +       };
 129 +
 130 +       /* The destination address may be overloaded by the target */
 131 +       if (route_info->gw)
 132 +               fl.fl4_dst = route_info->gw;
 133 +
 134 +       /* Trying to route the packet using the standard routing table. */
 135 +       if ((err = ip_route_output_key(&rt, &fl))) {
 136 +               if (net_ratelimit())
 137 +                       DEBUGP("ipt_ROUTE: couldn't route pkt (err: %i)",err);
 138 +               return -1;
 139 +       }
 140 +
 141 +       /* Drop old route. */
 142 +       dst_release(skb->dst);
 143 +       skb->dst = NULL;
 144 +
 145 +       /* Success if no oif specified or if the oif correspond to the
 146 +        * one desired */
 147 +       if (!ifindex || rt->u.dst.dev->ifindex == ifindex) {
 148 +               skb->dst = &rt->u.dst;
 149 +               skb->dev = skb->dst->dev;
 150 +               skb->protocol = htons(ETH_P_IP);
 151 +               return 1;
 152 +       }
 153 +
 154 +       /* The interface selected by the routing table is not the one
 155 +        * specified by the user. This may happen because the dst address
 156 +        * is one of our own addresses.
 157 +        */
 158 +       if (net_ratelimit())
 159 +               DEBUGP("ipt_ROUTE: failed to route as desired gw=%u.%u.%u.%u oif=%i (got oif=%i)\n",
 160 +                      NIPQUAD(route_info->gw), ifindex, rt->u.dst.dev->ifindex);
 161 +
 162 +       return 0;
 163 +}
 164 +
 165 +
 166 +/* Stolen from ip_finish_output2
 167 + * PRE : skb->dev is set to the device we are leaving by
 168 + *       skb->dst is not NULL
 169 + * POST: the packet is sent with the link layer header pushed
 170 + *       the packet is destroyed
 171 + */
 172 +static void ip_direct_send(struct sk_buff *skb)
 173 +{
 174 +       struct dst_entry *dst = skb->dst;
 175 +       struct hh_cache *hh = dst->hh;
 176 +       struct net_device *dev = dst->dev;
 177 +       int hh_len = LL_RESERVED_SPACE(dev);
 178 +
 179 +       /* Be paranoid, rather than too clever. */
 180 +       if (unlikely(skb_headroom(skb) < hh_len && dev->hard_header)) {
 181 +               struct sk_buff *skb2;
 182 +
 183 +               skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
 184 +               if (skb2 == NULL) {
 185 +                       kfree_skb(skb);
 186 +                       return;
 187 +               }
 188 +               if (skb->sk)
 189 +                       skb_set_owner_w(skb2, skb->sk);
 190 +               kfree_skb(skb);
 191 +               skb = skb2;
 192 +       }
 193 +
 194 +       if (hh) {
 195 +               int hh_alen;
 196 +
 197 +               read_lock_bh(&hh->hh_lock);
 198 +               hh_alen = HH_DATA_ALIGN(hh->hh_len);
 199 +               memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
 200 +               read_unlock_bh(&hh->hh_lock);
 201 +               skb_push(skb, hh->hh_len);
 202 +               hh->hh_output(skb);
 203 +       } else if (dst->neighbour)
 204 +               dst->neighbour->output(skb);
 205 +       else {
 206 +               if (net_ratelimit())
 207 +                       DEBUGP(KERN_DEBUG "ipt_ROUTE: no hdr & no neighbour cache!\n");
 208 +               kfree_skb(skb);
 209 +       }
 210 +}
 211 +
 212 +
 213 +/* PRE : skb->dev is set to the device we are leaving by
 214 + * POST: - the packet is directly sent to the skb->dev device, without
 215 + *         pushing the link layer header.
 216 + *       - the packet is destroyed
 217 + */
 218 +static inline int dev_direct_send(struct sk_buff *skb)
 219 +{
 220 +       return dev_queue_xmit(skb);
 221 +}
 222 +
 223 +
 224 +static unsigned int route_oif(const struct ipt_route_target_info *route_info,
 225 +                             struct sk_buff *skb)
 226 +{
 227 +       unsigned int ifindex = 0;
 228 +       struct net_device *dev_out = NULL;
 229 +
 230 +       /* The user set the interface name to use.
 231 +        * Getting the current interface index.
 232 +        */
 233 +       if ((dev_out = dev_get_by_name(route_info->oif))) {
 234 +               ifindex = dev_out->ifindex;
 235 +       } else {
 236 +               /* Unknown interface name : packet dropped */
 237 +               if (net_ratelimit())
 238 +                       DEBUGP("ipt_ROUTE: oif interface %s not found\n", route_info->oif);
 239 +               return NF_DROP;
 240 +       }
 241 +
 242 +       /* Trying the standard way of routing packets */
 243 +       switch (route(skb, ifindex, route_info)) {
 244 +       case 1:
 245 +               dev_put(dev_out);
 246 +               if (route_info->flags & IPT_ROUTE_CONTINUE)
 247 +                       return IPT_CONTINUE;
 248 +
 249 +               ip_direct_send(skb);
 250 +               return NF_STOLEN;
 251 +
 252 +       case 0:
 253 +               /* Failed to send to oif. Trying the hard way */
 254 +               if (route_info->flags & IPT_ROUTE_CONTINUE)
 255 +                       return NF_DROP;
 256 +
 257 +               if (net_ratelimit())
 258 +                       DEBUGP("ipt_ROUTE: forcing the use of %i\n",
 259 +                              ifindex);
 260 +
 261 +               /* We have to force the use of an interface.
 262 +                * This interface must be a tunnel interface since
 263 +                * otherwise we can't guess the hw address for
 264 +                * the packet. For a tunnel interface, no hw address
 265 +                * is needed.
 266 +                */
 267 +               if ((dev_out->type != ARPHRD_TUNNEL)
 268 +                   && (dev_out->type != ARPHRD_IPGRE)) {
 269 +                       if (net_ratelimit())
 270 +                               DEBUGP("ipt_ROUTE: can't guess the hw addr !\n");
 271 +                       dev_put(dev_out);
 272 +                       return NF_DROP;
 273 +               }
 274 +
 275 +               /* Send the packet. This will also free skb
 276 +                * Do not go through the POST_ROUTING hook because
 277 +                * skb->dst is not set and because it will probably
 278 +                * get confused by the destination IP address.
 279 +                */
 280 +               skb->dev = dev_out;
 281 +               dev_direct_send(skb);
 282 +               dev_put(dev_out);
 283 +               return NF_STOLEN;
 284 +
 285 +       default:
 286 +               /* Unexpected error */
 287 +               dev_put(dev_out);
 288 +               return NF_DROP;
 289 +       }
 290 +}
 291 +
 292 +
 293 +static unsigned int route_iif(const struct ipt_route_target_info *route_info,
 294 +                             struct sk_buff *skb)
 295 +{
 296 +       struct net_device *dev_in = NULL;
 297 +
 298 +       /* Getting the current interface index. */
 299 +       if (!(dev_in = dev_get_by_name(route_info->iif))) {
 300 +               if (net_ratelimit())
 301 +                       DEBUGP("ipt_ROUTE: iif interface %s not found\n", route_info->iif);
 302 +               return NF_DROP;
 303 +       }
 304 +
 305 +       skb->dev = dev_in;
 306 +       dst_release(skb->dst);
 307 +       skb->dst = NULL;
 308 +
 309 +       netif_rx(skb);
 310 +       dev_put(dev_in);
 311 +       return NF_STOLEN;
 312 +}
 313 +
 314 +
 315 +static unsigned int route_gw(const struct ipt_route_target_info *route_info,
 316 +                            struct sk_buff *skb)
 317 +{
 318 +       if (route(skb, 0, route_info)!=1)
 319 +               return NF_DROP;
 320 +
 321 +       if (route_info->flags & IPT_ROUTE_CONTINUE)
 322 +               return IPT_CONTINUE;
 323 +
 324 +       ip_direct_send(skb);
 325 +       return NF_STOLEN;
 326 +}
 327 +
 328 +
 329 +/* To detect and deter routed packet loopback when using the --tee option,
 330 + * we take a page out of the raw.patch book: on the copied skb, we set up
 331 + * a fake ->nfct entry, pointing to the local &route_tee_track. We skip
 332 + * routing packets when we see they already have that ->nfct.
 333 + */
 334 +
 335 +static struct ip_conntrack route_tee_track;
 336 +
 337 +static unsigned int ipt_route_target(struct sk_buff **pskb,
 338 +                                    const struct net_device *in,
 339 +                                    const struct net_device *out,
 340 +                                    unsigned int hooknum,
 341 +                                   const struct xt_target *target,
 342 +                                    const void *targinfo)
 343 +{
 344 +       const struct ipt_route_target_info *route_info = targinfo;
 345 +       struct sk_buff *skb = *pskb;
 346 +       unsigned int res;
 347 +
 348 +       if (skb->nfct == &route_tee_track.ct_general) {
 349 +               /* Loopback - a packet we already routed, is to be
 350 +                * routed another time. Avoid that, now.
 351 +                */
 352 +               if (net_ratelimit())
 353 +                       DEBUGP(KERN_DEBUG "ipt_ROUTE: loopback - DROP!\n");
 354 +               return NF_DROP;
 355 +       }
 356 +
 357 +       /* If we are at PREROUTING or INPUT hook
 358 +        * the TTL isn't decreased by the IP stack
 359 +        */
 360 +       if (hooknum == NF_IP_PRE_ROUTING ||
 361 +           hooknum == NF_IP_LOCAL_IN) {
 362 +
 363 +               struct iphdr *iph = skb->nh.iph;
 364 +
 365 +               if (iph->ttl <= 1) {
 366 +                       struct rtable *rt;
 367 +                       struct flowi fl = {
 368 +                               .oif = 0,
 369 +                               .nl_u = {
 370 +                                       .ip4_u = {
 371 +                                               .daddr = iph->daddr,
 372 +                                               .saddr = iph->saddr,
 373 +                                               .tos = RT_TOS(iph->tos),
 374 +                                               .scope = ((iph->tos & RTO_ONLINK) ?
 375 +                                                         RT_SCOPE_LINK :
 376 +                                                         RT_SCOPE_UNIVERSE)
 377 +                                       }
 378 +                               }
 379 +                       };
 380 +
 381 +                       if (ip_route_output_key(&rt, &fl)) {
 382 +                               return NF_DROP;
 383 +                       }
 384 +
 385 +                       if (skb->dev == rt->u.dst.dev) {
 386 +                               /* Drop old route. */
 387 +                               dst_release(skb->dst);
 388 +                               skb->dst = &rt->u.dst;
 389 +
 390 +                               /* this will traverse normal stack, and
 391 +                                * thus call conntrack on the icmp packet */
 392 +                               icmp_send(skb, ICMP_TIME_EXCEEDED,
 393 +                                         ICMP_EXC_TTL, 0);
 394 +                       }
 395 +
 396 +                       return NF_DROP;
 397 +               }
 398 +
 399 +               /*
 400 +                * If we are at INPUT the checksum must be recalculated since
 401 +                * the length could change as the result of a defragmentation.
 402 +                */
 403 +               if(hooknum == NF_IP_LOCAL_IN) {
 404 +                       iph->ttl = iph->ttl - 1;
 405 +                       iph->check = 0;
 406 +                       iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 407 +               } else {
 408 +                       ip_decrease_ttl(iph);
 409 +               }
 410 +       }
 411 +
 412 +       if ((route_info->flags & IPT_ROUTE_TEE)) {
 413 +               /*
 414 +                * Copy the *pskb, and route the copy. Will later return
 415 +                * IPT_CONTINUE for the original skb, which should continue
 416 +                * on its way as if nothing happened. The copy should be
 417 +                * independantly delivered to the ROUTE --gw.
 418 +                */
 419 +               skb = skb_copy(*pskb, GFP_ATOMIC);
 420 +               if (!skb) {
 421 +                       if (net_ratelimit())
 422 +                               DEBUGP(KERN_DEBUG "ipt_ROUTE: copy failed!\n");
 423 +                       return IPT_CONTINUE;
 424 +               }
 425 +       }
 426 +
 427 +       /* Tell conntrack to forget this packet since it may get confused
 428 +        * when a packet is leaving with dst address == our address.
 429 +        * Good idea ? Dunno. Need advice.
 430 +        *
 431 +        * NEW: mark the skb with our &route_tee_track, so we avoid looping
 432 +        * on any already routed packet.
 433 +        */
 434 +       if (!(route_info->flags & IPT_ROUTE_CONTINUE)) {
 435 +               nf_conntrack_put(skb->nfct);
 436 +               skb->nfct = &route_tee_track.ct_general;
 437 +               skb->nfctinfo = IP_CT_NEW;
 438 +               nf_conntrack_get(skb->nfct);
 439 +       }
 440 +
 441 +       if (route_info->oif[0] != '\0') {
 442 +               res = route_oif(route_info, skb);
 443 +       } else if (route_info->iif[0] != '\0') {
 444 +               res = route_iif(route_info, skb);
 445 +       } else if (route_info->gw) {
 446 +               res = route_gw(route_info, skb);
 447 +       } else {
 448 +               if (net_ratelimit())
 449 +                       DEBUGP(KERN_DEBUG "ipt_ROUTE: no parameter !\n");
 450 +               res = IPT_CONTINUE;
 451 +       }
 452 +
 453 +       if ((route_info->flags & IPT_ROUTE_TEE))
 454 +               res = IPT_CONTINUE;
 455 +
 456 +       return res;
 457 +}
 458 +
 459 +
 460 +static int ipt_route_checkentry(const char *tablename,
 461 +                               const void *e,
 462 +                              const struct xt_target *target,
 463 +                               void *targinfo,
 464 +                               unsigned int hook_mask)
 465 +{
 466 +       if (strcmp(tablename, "mangle") != 0) {
 467 +               printk("ipt_ROUTE: bad table `%s', use the `mangle' table.\n",
 468 +                      tablename);
 469 +               return 0;
 470 +       }
 471 +
 472 +       if (hook_mask & ~(  (1 << NF_IP_PRE_ROUTING)
 473 +                           | (1 << NF_IP_LOCAL_IN)
 474 +                           | (1 << NF_IP_FORWARD)
 475 +                           | (1 << NF_IP_LOCAL_OUT)
 476 +                           | (1 << NF_IP_POST_ROUTING))) {
 477 +               printk("ipt_ROUTE: bad hook\n");
 478 +               return 0;
 479 +       }
 480 +
 481 +       return 1;
 482 +}
 483 +
 484 +
 485 +static struct ipt_target ipt_route_reg = {
 486 +       .name = "ROUTE",
 487 +       .target = ipt_route_target,
 488 +       .targetsize = sizeof(struct ipt_route_target_info),
 489 +       .checkentry = ipt_route_checkentry,
 490 +       .me = THIS_MODULE,
 491 +};
 492 +
 493 +static int __init init(void)
 494 +{
 495 +       /* Set up fake conntrack (stolen from raw.patch):
 496 +           - to never be deleted, not in any hashes */
 497 +       atomic_set(&route_tee_track.ct_general.use, 1);
 498 +       /*  - and look it like as a confirmed connection */
 499 +       set_bit(IPS_CONFIRMED_BIT, &route_tee_track.status);
 500 +       /* Initialize fake conntrack so that NAT will skip it */
 501 +       route_tee_track.status |= IPS_NAT_DONE_MASK;
 502 +
 503 +       return ipt_register_target(&ipt_route_reg);
 504 +}
 505 +
 506 +
 507 +static void __exit fini(void)
 508 +{
 509 +       ipt_unregister_target(&ipt_route_reg);
 510 +}
 511 +
 512 +module_init(init);
 513 +module_exit(fini);
 514 diff -urN linux-2.6.19.old/net/ipv4/netfilter/Kconfig linux-2.6.19.dev/net/ipv4/netfilter/Kconfig
 515 --- linux-2.6.19.old/net/ipv4/netfilter/Kconfig 2006-12-14 03:13:49.000000000 +0100
 516 +++ linux-2.6.19.dev/net/ipv4/netfilter/Kconfig 2006-12-14 03:13:49.000000000 +0100
 517 @@ -494,6 +494,23 @@
 518
 519           To compile it as a module, choose M here.  If unsure, say N.
 520
 521 +config IP_NF_TARGET_ROUTE
 522 +        tristate  'ROUTE target support'
 523 +        depends on IP_NF_MANGLE
 524 +        help
 525 +          This option adds a `ROUTE' target, which enables you to setup unusual
 526 +          routes. For example, the ROUTE lets you route a received packet through
 527 +          an interface or towards a host, even if the regular destination of the
 528 +          packet is the router itself. The ROUTE target is also able to change the
 529 +          incoming interface of a packet.
 530 +
 531 +          The target can be or not a final target. It has to be used inside the
 532 +          mangle table.
 533 +
 534 +          If you want to compile it as a module, say M here and read
 535 +          Documentation/modules.txt.  The module will be called ipt_ROUTE.o.
 536 +          If unsure, say `N'.
 537 +
 538  config IP_NF_TARGET_NETMAP
 539         tristate "NETMAP target support"
 540         depends on IP_NF_NAT
 541 diff -urN linux-2.6.19.old/net/ipv4/netfilter/Makefile linux-2.6.19.dev/net/ipv4/netfilter/Makefile
 542 --- linux-2.6.19.old/net/ipv4/netfilter/Makefile        2006-12-14 03:13:49.000000000 +0100
 543 +++ linux-2.6.19.dev/net/ipv4/netfilter/Makefile        2006-12-14 03:13:49.000000000 +0100
 544 @@ -74,6 +74,7 @@
 545  obj-$(CONFIG_IP_NF_TARGET_IMQ) += ipt_IMQ.o
 546  obj-$(CONFIG_IP_NF_TARGET_MASQUERADE) += ipt_MASQUERADE.o
 547  obj-$(CONFIG_IP_NF_TARGET_REDIRECT) += ipt_REDIRECT.o
 548 +obj-$(CONFIG_IP_NF_TARGET_ROUTE) += ipt_ROUTE.o
 549  obj-$(CONFIG_IP_NF_TARGET_NETMAP) += ipt_NETMAP.o
 550  obj-$(CONFIG_IP_NF_TARGET_SAME) += ipt_SAME.o
 551  obj-$(CONFIG_IP_NF_NAT_SNMP_BASIC) += ip_nat_snmp_basic.o
 552 diff -urN linux-2.6.19.old/net/ipv6/ipv6_syms.c linux-2.6.19.dev/net/ipv6/ipv6_syms.c
 553 --- linux-2.6.19.old/net/ipv6/ipv6_syms.c       2006-11-29 22:57:37.000000000 +0100
 554 +++ linux-2.6.19.dev/net/ipv6/ipv6_syms.c       2006-12-14 03:13:49.000000000 +0100
 555 @@ -11,6 +11,7 @@
 556  EXPORT_SYMBOL(icmpv6_statistics);
 557  EXPORT_SYMBOL(icmpv6_err_convert);
 558  EXPORT_SYMBOL(ndisc_mc_map);
 559 +EXPORT_SYMBOL(nd_tbl);
 560  EXPORT_SYMBOL(register_inet6addr_notifier);
 561  EXPORT_SYMBOL(unregister_inet6addr_notifier);
 562  EXPORT_SYMBOL(ip6_route_output);
 563 diff -urN linux-2.6.19.old/net/ipv6/netfilter/ip6t_ROUTE.c linux-2.6.19.dev/net/ipv6/netfilter/ip6t_ROUTE.c
 564 --- linux-2.6.19.old/net/ipv6/netfilter/ip6t_ROUTE.c    1970-01-01 01:00:00.000000000 +0100
 565 +++ linux-2.6.19.dev/net/ipv6/netfilter/ip6t_ROUTE.c    2006-12-14 03:13:49.000000000 +0100
 566 @@ -0,0 +1,302 @@
 567 +/*
 568 + * This implements the ROUTE v6 target, which enables you to setup unusual
 569 + * routes not supported by the standard kernel routing table.
 570 + *
 571 + * Copyright (C) 2003 Cedric de Launois <delaunois@info.ucl.ac.be>
 572 + *
 573 + * v 1.1 2004/11/23
 574 + *
 575 + * This software is distributed under GNU GPL v2, 1991
 576 + */
 577 +
 578 +#include <linux/module.h>
 579 +#include <linux/skbuff.h>
 580 +#include <linux/ipv6.h>
 581 +#include <linux/netfilter_ipv6/ip6_tables.h>
 582 +#include <linux/netfilter_ipv6/ip6t_ROUTE.h>
 583 +#include <linux/netdevice.h>
 584 +#include <net/ipv6.h>
 585 +#include <net/ndisc.h>
 586 +#include <net/ip6_route.h>
 587 +#include <linux/icmpv6.h>
 588 +
 589 +#if 1
 590 +#define DEBUGP printk
 591 +#else
 592 +#define DEBUGP(format, args...)
 593 +#endif
 594 +
 595 +#define NIP6(addr) \
 596 +       ntohs((addr).s6_addr16[0]), \
 597 +       ntohs((addr).s6_addr16[1]), \
 598 +       ntohs((addr).s6_addr16[2]), \
 599 +       ntohs((addr).s6_addr16[3]), \
 600 +       ntohs((addr).s6_addr16[4]), \
 601 +       ntohs((addr).s6_addr16[5]), \
 602 +       ntohs((addr).s6_addr16[6]), \
 603 +       ntohs((addr).s6_addr16[7])
 604 +
 605 +/* Route the packet according to the routing keys specified in
 606 + * route_info. Keys are :
 607 + *  - ifindex :
 608 + *      0 if no oif preferred,
 609 + *      otherwise set to the index of the desired oif
 610 + *  - route_info->gw :
 611 + *      0 if no gateway specified,
 612 + *      otherwise set to the next host to which the pkt must be routed
 613 + * If success, skb->dev is the output device to which the packet must
 614 + * be sent and skb->dst is not NULL
 615 + *
 616 + * RETURN:  1 if the packet was succesfully routed to the
 617 + *            destination desired
 618 + *          0 if the kernel routing table could not route the packet
 619 + *            according to the keys specified
 620 + */
 621 +static int
 622 +route6(struct sk_buff *skb,
 623 +       unsigned int ifindex,
 624 +       const struct ip6t_route_target_info *route_info)
 625 +{
 626 +       struct rt6_info *rt = NULL;
 627 +       struct ipv6hdr *ipv6h = skb->nh.ipv6h;
 628 +       struct in6_addr *gw = (struct in6_addr*)&route_info->gw;
 629 +
 630 +       DEBUGP("ip6t_ROUTE: called with: ");
 631 +       DEBUGP("DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(ipv6h->daddr));
 632 +       DEBUGP("GATEWAY=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(*gw));
 633 +       DEBUGP("OUT=%s\n", route_info->oif);
 634 +
 635 +       if (ipv6_addr_any(gw))
 636 +               rt = rt6_lookup(&ipv6h->daddr, &ipv6h->saddr, ifindex, 1);
 637 +       else
 638 +               rt = rt6_lookup(gw, &ipv6h->saddr, ifindex, 1);
 639 +
 640 +       if (!rt)
 641 +               goto no_route;
 642 +
 643 +       DEBUGP("ip6t_ROUTE: routing gives: ");
 644 +       DEBUGP("DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(rt->rt6i_dst.addr));
 645 +       DEBUGP("GATEWAY=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(rt->rt6i_gateway));
 646 +       DEBUGP("OUT=%s\n", rt->rt6i_dev->name);
 647 +
 648 +       if (ifindex && rt->rt6i_dev->ifindex!=ifindex)
 649 +               goto wrong_route;
 650 +
 651 +       if (!rt->rt6i_nexthop) {
 652 +               DEBUGP("ip6t_ROUTE: discovering neighbour\n");
 653 +               rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_dst.addr);
 654 +       }
 655 +
 656 +       /* Drop old route. */
 657 +       dst_release(skb->dst);
 658 +       skb->dst = &rt->u.dst;
 659 +       skb->dev = rt->rt6i_dev;
 660 +       return 1;
 661 +
 662 + wrong_route:
 663 +       dst_release(&rt->u.dst);
 664 + no_route:
 665 +       if (!net_ratelimit())
 666 +               return 0;
 667 +
 668 +       printk("ip6t_ROUTE: no explicit route found ");
 669 +       if (ifindex)
 670 +               printk("via interface %s ", route_info->oif);
 671 +       if (!ipv6_addr_any(gw))
 672 +               printk("via gateway %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x", NIP6(*gw));
 673 +       printk("\n");
 674 +       return 0;
 675 +}
 676 +
 677 +
 678 +/* Stolen from ip6_output_finish
 679 + * PRE : skb->dev is set to the device we are leaving by
 680 + *       skb->dst is not NULL
 681 + * POST: the packet is sent with the link layer header pushed
 682 + *       the packet is destroyed
 683 + */
 684 +static void ip_direct_send(struct sk_buff *skb)
 685 +{
 686 +       struct dst_entry *dst = skb->dst;
 687 +       struct hh_cache *hh = dst->hh;
 688 +
 689 +       if (hh) {
 690 +               read_lock_bh(&hh->hh_lock);
 691 +               memcpy(skb->data - 16, hh->hh_data, 16);
 692 +               read_unlock_bh(&hh->hh_lock);
 693 +               skb_push(skb, hh->hh_len);
 694 +               hh->hh_output(skb);
 695 +       } else if (dst->neighbour)
 696 +               dst->neighbour->output(skb);
 697 +       else {
 698 +               if (net_ratelimit())
 699 +                       DEBUGP(KERN_DEBUG "ip6t_ROUTE: no hdr & no neighbour cache!\n");
 700 +               kfree_skb(skb);
 701 +       }
 702 +}
 703 +
 704 +
 705 +static unsigned int
 706 +route6_oif(const struct ip6t_route_target_info *route_info,
 707 +          struct sk_buff *skb)
 708 +{
 709 +       unsigned int ifindex = 0;
 710 +       struct net_device *dev_out = NULL;
 711 +
 712 +       /* The user set the interface name to use.
 713 +        * Getting the current interface index.
 714 +        */
 715 +       if ((dev_out = dev_get_by_name(route_info->oif))) {
 716 +               ifindex = dev_out->ifindex;
 717 +       } else {
 718 +               /* Unknown interface name : packet dropped */
 719 +               if (net_ratelimit())
 720 +                       DEBUGP("ip6t_ROUTE: oif interface %s not found\n", route_info->oif);
 721 +
 722 +               if (route_info->flags & IP6T_ROUTE_CONTINUE)
 723 +                       return IP6T_CONTINUE;
 724 +               else
 725 +                       return NF_DROP;
 726 +       }
 727 +
 728 +       /* Trying the standard way of routing packets */
 729 +       if (route6(skb, ifindex, route_info)) {
 730 +               dev_put(dev_out);
 731 +               if (route_info->flags & IP6T_ROUTE_CONTINUE)
 732 +                       return IP6T_CONTINUE;
 733 +
 734 +               ip_direct_send(skb);
 735 +               return NF_STOLEN;
 736 +       } else
 737 +               return NF_DROP;
 738 +}
 739 +
 740 +
 741 +static unsigned int
 742 +route6_gw(const struct ip6t_route_target_info *route_info,
 743 +         struct sk_buff *skb)
 744 +{
 745 +       if (route6(skb, 0, route_info)) {
 746 +               if (route_info->flags & IP6T_ROUTE_CONTINUE)
 747 +                       return IP6T_CONTINUE;
 748 +
 749 +               ip_direct_send(skb);
 750 +               return NF_STOLEN;
 751 +       } else
 752 +               return NF_DROP;
 753 +}
 754 +
 755 +
 756 +static unsigned int
 757 +ip6t_route_target(struct sk_buff **pskb,
 758 +                 const struct net_device *in,
 759 +                 const struct net_device *out,
 760 +                 unsigned int hooknum,
 761 +                const struct xt_target *target,
 762 +                 const void *targinfo)
 763 +{
 764 +       const struct ip6t_route_target_info *route_info = targinfo;
 765 +       struct sk_buff *skb = *pskb;
 766 +       struct in6_addr *gw = (struct in6_addr*)&route_info->gw;
 767 +       unsigned int res;
 768 +
 769 +       if (route_info->flags & IP6T_ROUTE_CONTINUE)
 770 +               goto do_it;
 771 +
 772 +       /* If we are at PREROUTING or INPUT hook
 773 +        * the TTL isn't decreased by the IP stack
 774 +        */
 775 +       if (hooknum == NF_IP6_PRE_ROUTING ||
 776 +           hooknum == NF_IP6_LOCAL_IN) {
 777 +
 778 +               struct ipv6hdr *ipv6h = skb->nh.ipv6h;
 779 +
 780 +               if (ipv6h->hop_limit <= 1) {
 781 +                       /* Force OUTPUT device used as source address */
 782 +                       skb->dev = skb->dst->dev;
 783 +
 784 +                       icmpv6_send(skb, ICMPV6_TIME_EXCEED,
 785 +                                   ICMPV6_EXC_HOPLIMIT, 0, skb->dev);
 786 +
 787 +                       return NF_DROP;
 788 +               }
 789 +
 790 +               ipv6h->hop_limit--;
 791 +       }
 792 +
 793 +       if ((route_info->flags & IP6T_ROUTE_TEE)) {
 794 +               /*
 795 +                * Copy the *pskb, and route the copy. Will later return
 796 +                * IP6T_CONTINUE for the original skb, which should continue
 797 +                * on its way as if nothing happened. The copy should be
 798 +                * independantly delivered to the ROUTE --gw.
 799 +                */
 800 +               skb = skb_copy(*pskb, GFP_ATOMIC);
 801 +               if (!skb) {
 802 +                       if (net_ratelimit())
 803 +                               DEBUGP(KERN_DEBUG "ip6t_ROUTE: copy failed!\n");
 804 +                       return IP6T_CONTINUE;
 805 +               }
 806 +       }
 807 +
 808 +do_it:
 809 +       if (route_info->oif[0]) {
 810 +               res = route6_oif(route_info, skb);
 811 +       } else if (!ipv6_addr_any(gw)) {
 812 +               res = route6_gw(route_info, skb);
 813 +       } else {
 814 +               if (net_ratelimit())
 815 +                       DEBUGP(KERN_DEBUG "ip6t_ROUTE: no parameter !\n");
 816 +               res = IP6T_CONTINUE;
 817 +       }
 818 +
 819 +       if ((route_info->flags & IP6T_ROUTE_TEE))
 820 +               res = IP6T_CONTINUE;
 821 +
 822 +       return res;
 823 +}
 824 +
 825 +
 826 +static int
 827 +ip6t_route_checkentry(const char *tablename,
 828 +                     const void *e,
 829 +                    const struct xt_target *target,
 830 +                     void *targinfo,
 831 +                     unsigned int hook_mask)
 832 +{
 833 +       if (strcmp(tablename, "mangle") != 0) {
 834 +               printk("ip6t_ROUTE: can only be called from \"mangle\" table.\n");
 835 +               return 0;
 836 +       }
 837 +
 838 +       return 1;
 839 +}
 840 +
 841 +
 842 +static struct ip6t_target ip6t_route_reg = {
 843 +       .name       = "ROUTE",
 844 +       .target     = ip6t_route_target,
 845 +       .targetsize = sizeof(struct ip6t_route_target_info),
 846 +       .checkentry = ip6t_route_checkentry,
 847 +       .me         = THIS_MODULE
 848 +};
 849 +
 850 +
 851 +static int __init init(void)
 852 +{
 853 +       printk(KERN_DEBUG "registering ipv6 ROUTE target\n");
 854 +       if (ip6t_register_target(&ip6t_route_reg))
 855 +               return -EINVAL;
 856 +
 857 +       return 0;
 858 +}
 859 +
 860 +
 861 +static void __exit fini(void)
 862 +{
 863 +       ip6t_unregister_target(&ip6t_route_reg);
 864 +}
 865 +
 866 +module_init(init);
 867 +module_exit(fini);
 868 +MODULE_LICENSE("GPL");
 869 diff -urN linux-2.6.19.old/net/ipv6/netfilter/Kconfig linux-2.6.19.dev/net/ipv6/netfilter/Kconfig
 870 --- linux-2.6.19.old/net/ipv6/netfilter/Kconfig 2006-12-14 03:13:49.000000000 +0100
 871 +++ linux-2.6.19.dev/net/ipv6/netfilter/Kconfig 2006-12-14 03:13:49.000000000 +0100
 872 @@ -162,6 +162,19 @@
 873
 874           To compile it as a module, choose M here.  If unsure, say N.
 875
 876 +config IP6_NF_TARGET_ROUTE
 877 +        tristate "ROUTE target support"
 878 +        depends on IP6_NF_MANGLE
 879 +        help
 880 +          This option adds a `ROUTE' target, which enables you to setup unusual
 881 +          routes. The ROUTE target is also able to change the incoming interface
 882 +          of a packet.
 883 +
 884 +          The target can be or not a final target. It has to be used inside the
 885 +          mangle table.
 886 +
 887 +          Not working as a module.
 888 +
 889  config IP6_NF_MANGLE
 890         tristate "Packet mangling"
 891         depends on IP6_NF_IPTABLES
 892 diff -urN linux-2.6.19.old/net/ipv6/netfilter/Makefile linux-2.6.19.dev/net/ipv6/netfilter/Makefile
 893 --- linux-2.6.19.old/net/ipv6/netfilter/Makefile        2006-12-14 03:13:49.000000000 +0100
 894 +++ linux-2.6.19.dev/net/ipv6/netfilter/Makefile        2006-12-14 03:13:49.000000000 +0100
 895 @@ -20,6 +20,7 @@
 896  obj-$(CONFIG_IP6_NF_RAW) += ip6table_raw.o
 897  obj-$(CONFIG_IP6_NF_MATCH_HL) += ip6t_hl.o
 898  obj-$(CONFIG_IP6_NF_TARGET_REJECT) += ip6t_REJECT.o
 899 +obj-$(CONFIG_IP6_NF_TARGET_ROUTE) += ip6t_ROUTE.o
 900
 901  # objects for l3 independent conntrack
 902  nf_conntrack_ipv6-objs  :=  nf_conntrack_l3proto_ipv6.o nf_conntrack_proto_icmpv6.o nf_conntrack_reasm.o