linux-2.6-522-iptables-connection-tagging.patch

   1 diff -Nurb linux-2.6.27-521/include/linux/netfilter/xt_MARK.h linux-2.6.27-522/include/linux/netfilter/xt_MARK.h
   2 --- linux-2.6.27-521/include/linux/netfilter/xt_MARK.h  2008-10-09 18:13:53.000000000 -0400
   3 +++ linux-2.6.27-522/include/linux/netfilter/xt_MARK.h  2009-12-10 12:09:35.000000000 -0500
   4 @@ -11,6 +11,7 @@
   5         XT_MARK_SET=0,
   6         XT_MARK_AND,
   7         XT_MARK_OR,
   8 +       XT_MARK_COPYXID,
   9  };
  10
  11  struct xt_mark_target_info_v1 {
  12 diff -Nurb linux-2.6.27-521/include/linux/netfilter/xt_SETXID.h linux-2.6.27-522/include/linux/netfilter/xt_SETXID.h
  13 --- linux-2.6.27-521/include/linux/netfilter/xt_SETXID.h        1969-12-31 19:00:00.000000000 -0500
  14 +++ linux-2.6.27-522/include/linux/netfilter/xt_SETXID.h        2009-12-10 12:09:35.000000000 -0500
  15 @@ -0,0 +1,14 @@
  16 +#ifndef _XT_SETXID_H_target
  17 +#define _XT_SETXID_H_target
  18 +
  19 +/* Version 1 */
  20 +enum {
  21 +       XT_SET_PACKET_XID=0
  22 +};
  23 +
  24 +struct xt_setxid_target_info_v1 {
  25 +       unsigned long mark;
  26 +       u_int8_t mode;
  27 +};
  28 +
  29 +#endif /*_XT_SETXID_H_target*/
  30 diff -Nurb linux-2.6.27-521/include/linux/netfilter_ipv4/ipt_MARK.h linux-2.6.27-522/include/linux/netfilter_ipv4/ipt_MARK.h
  31 --- linux-2.6.27-521/include/linux/netfilter_ipv4/ipt_MARK.h    2008-10-09 18:13:53.000000000 -0400
  32 +++ linux-2.6.27-522/include/linux/netfilter_ipv4/ipt_MARK.h    2009-12-10 12:09:35.000000000 -0500
  33 @@ -12,6 +12,7 @@
  34  #define IPT_MARK_SET   XT_MARK_SET
  35  #define IPT_MARK_AND   XT_MARK_AND
  36  #define        IPT_MARK_OR     XT_MARK_OR
  37 +#define IPT_MARK_COPYXID       XT_MARK_COPYXID
  38
  39  #define ipt_mark_target_info_v1 xt_mark_target_info_v1
  40
  41 diff -Nurb linux-2.6.27-521/include/linux/netfilter_ipv4/ipt_SETXID.h linux-2.6.27-522/include/linux/netfilter_ipv4/ipt_SETXID.h
  42 --- linux-2.6.27-521/include/linux/netfilter_ipv4/ipt_SETXID.h  1969-12-31 19:00:00.000000000 -0500
  43 +++ linux-2.6.27-522/include/linux/netfilter_ipv4/ipt_SETXID.h  2009-12-10 12:09:35.000000000 -0500
  44 @@ -0,0 +1,13 @@
  45 +#ifndef _IPT_SETXID_H_target
  46 +#define _IPT_SETXID_H_target
  47 +
  48 +/* Backwards compatibility for old userspace */
  49 +
  50 +#include <linux/netfilter/xt_SETXID.h>
  51 +
  52 +/* Version 1 */
  53 +#define IPT_SET_PACKET_XID     XT_SET_PACKET_XID
  54 +
  55 +#define ipt_setxid_target_info_v1 xt_setxid_target_info_v1
  56 +
  57 +#endif /*_IPT_SETXID_H_target*/
  58 diff -Nurb linux-2.6.27-521/include/net/netfilter/nf_conntrack.h linux-2.6.27-522/include/net/netfilter/nf_conntrack.h
  59 --- linux-2.6.27-521/include/net/netfilter/nf_conntrack.h       2008-10-09 18:13:53.000000000 -0400
  60 +++ linux-2.6.27-522/include/net/netfilter/nf_conntrack.h       2009-12-10 12:09:35.000000000 -0500
  61 @@ -121,6 +121,9 @@
  62         /* Storage reserved for other modules: */
  63         union nf_conntrack_proto proto;
  64
  65 +       /* PLANETLAB. VNET-specific */
  66 +       int xid[IP_CT_DIR_MAX];
  67 +
  68         /* Extensions */
  69         struct nf_ct_ext *ext;
  70
  71 diff -Nurb linux-2.6.27-521/net/netfilter/Kconfig linux-2.6.27-522/net/netfilter/Kconfig
  72 --- linux-2.6.27-521/net/netfilter/Kconfig      2008-10-09 18:13:53.000000000 -0400
  73 +++ linux-2.6.27-522/net/netfilter/Kconfig      2009-12-10 12:09:35.000000000 -0500
  74 @@ -477,6 +477,13 @@
  75           This option adds a "TCPOPTSTRIP" target, which allows you to strip
  76           TCP options from TCP packets.
  77
  78 +config NETFILTER_XT_TARGET_SETXID
  79 +       tristate '"SETXID" target support'
  80 +       depends on NETFILTER_XTABLES
  81 +       help
  82 +         This option adds a `SETXID' target, which allows you to alter the
  83 +         xid of a socket.
  84 +
  85  config NETFILTER_XT_MATCH_COMMENT
  86         tristate  '"comment" match support'
  87         depends on NETFILTER_XTABLES
  88 diff -Nurb linux-2.6.27-521/net/netfilter/Makefile linux-2.6.27-522/net/netfilter/Makefile
  89 --- linux-2.6.27-521/net/netfilter/Makefile     2008-10-09 18:13:53.000000000 -0400
  90 +++ linux-2.6.27-522/net/netfilter/Makefile     2009-12-10 12:09:35.000000000 -0500
  91 @@ -38,6 +38,7 @@
  92  obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
  93
  94  # targets
  95 +obj-$(CONFIG_NETFILTER_XT_TARGET_SETXID) += xt_SETXID.o
  96  obj-$(CONFIG_NETFILTER_XT_TARGET_CLASSIFY) += xt_CLASSIFY.o
  97  obj-$(CONFIG_NETFILTER_XT_TARGET_CONNMARK) += xt_CONNMARK.o
  98  obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSECMARK) += xt_CONNSECMARK.o
  99 diff -Nurb linux-2.6.27-521/net/netfilter/nf_conntrack_core.c linux-2.6.27-522/net/netfilter/nf_conntrack_core.c
 100 --- linux-2.6.27-521/net/netfilter/nf_conntrack_core.c  2008-10-09 18:13:53.000000000 -0400
 101 +++ linux-2.6.27-522/net/netfilter/nf_conntrack_core.c  2009-12-10 12:09:35.000000000 -0500
 102 @@ -595,6 +595,9 @@
 103         /* Overload tuple linked list to put us in unconfirmed list. */
 104         hlist_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode, &unconfirmed);
 105
 106 +       ct->xid[IP_CT_DIR_ORIGINAL] = -1;
 107 +       ct->xid[IP_CT_DIR_REPLY] = -1;
 108 +
 109         spin_unlock_bh(&nf_conntrack_lock);
 110
 111         if (exp) {
 112 diff -Nurb linux-2.6.27-521/net/netfilter/xt_MARK.c linux-2.6.27-522/net/netfilter/xt_MARK.c
 113 --- linux-2.6.27-521/net/netfilter/xt_MARK.c    2008-10-09 18:13:53.000000000 -0400
 114 +++ linux-2.6.27-522/net/netfilter/xt_MARK.c    2009-12-16 01:39:55.000000000 -0500
 115 @@ -13,7 +13,13 @@
 116  #include <linux/module.h>
 117  #include <linux/skbuff.h>
 118  #include <linux/ip.h>
 119 +#include <net/udp.h>
 120  #include <net/checksum.h>
 121 +#include <net/route.h>
 122 +#include <net/inet_hashtables.h>
 123 +#include <net/net_namespace.h>
 124 +
 125 +#include <net/netfilter/nf_conntrack.h>
 126
 127  #include <linux/netfilter/x_tables.h>
 128  #include <linux/netfilter/xt_MARK.h>
 129 @@ -24,6 +30,8 @@
 130  MODULE_ALIAS("ipt_MARK");
 131  MODULE_ALIAS("ip6t_MARK");
 132
 133 +extern DEFINE_PER_CPU(int, sknid_elevator);
 134 +
 135  static unsigned int
 136  mark_tg_v0(struct sk_buff *skb, const struct net_device *in,
 137             const struct net_device *out, unsigned int hooknum,
 138 @@ -61,14 +69,256 @@
 139         return XT_CONTINUE;
 140  }
 141
 142 +#define PEERCRED_SET(x) ((x!=0) && (x!=(unsigned int)-1))
 143 +
 144 +
 145 +static inline u_int16_t
 146 +get_dst_port(struct nf_conntrack_tuple *tuple)
 147 +{
 148 +       switch (tuple->dst.protonum) {
 149 +       case IPPROTO_GRE:
 150 +               /* XXX Truncate 32-bit GRE key to 16 bits */
 151 +               return tuple->dst.u.gre.key;
 152 +       case IPPROTO_ICMP:
 153 +               /* Bind on ICMP echo ID */
 154 +               return tuple->src.u.icmp.id;
 155 +       case IPPROTO_TCP:
 156 +               return tuple->dst.u.tcp.port;
 157 +       case IPPROTO_UDP:
 158 +               return tuple->dst.u.udp.port;
 159 +       default:
 160 +               return tuple->dst.u.all;
 161 +       }
 162 +}
 163 +
 164 +static inline u_int16_t
 165 +get_src_port(struct nf_conntrack_tuple *tuple)
 166 +{
 167 +       switch (tuple->dst.protonum) {
 168 +       case IPPROTO_GRE:
 169 +               /* XXX Truncate 32-bit GRE key to 16 bits */
 170 +               return htons(ntohl(tuple->src.u.gre.key));
 171 +       case IPPROTO_ICMP:
 172 +               /* Bind on ICMP echo ID */
 173 +               return tuple->src.u.icmp.id;
 174 +       case IPPROTO_TCP:
 175 +               return tuple->src.u.tcp.port;
 176 +       case IPPROTO_UDP:
 177 +               return tuple->src.u.udp.port;
 178 +       default:
 179 +               return tuple->src.u.all;
 180 +       }
 181 +}
 182 +
 183 +static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
 184 +               __be16 sport, __be32 daddr, __be16 dport,
 185 +               int dif, struct hlist_head udptable[])
 186 +{
 187 +       struct sock *sk, *result = NULL;
 188 +       struct hlist_node *node;
 189 +       unsigned short hnum = ntohs(dport);
 190 +       int badness = -1;
 191 +
 192 +       read_lock(&udp_hash_lock);
 193 +       sk_for_each(sk, node, &udptable[udp_hashfn(net, hnum)]) {
 194 +               struct inet_sock *inet = inet_sk(sk);
 195 +
 196 +               if (net_eq(sock_net(sk), net) && sk->sk_hash == hnum &&
 197 +                               !ipv6_only_sock(sk)) {
 198 +                       int score = (sk->sk_family == PF_INET ? 1 : 0);
 199 +
 200 +                       if (inet->rcv_saddr) {
 201 +                               if (inet->rcv_saddr != daddr)
 202 +                                       continue;
 203 +                               score+=2;
 204 +                       } else {
 205 +                               /* block non nx_info ips */
 206 +                               if (!v4_addr_in_nx_info(sk->sk_nx_info,
 207 +                                       daddr, NXA_MASK_BIND))
 208 +                                       continue;
 209 +                       }
 210 +                       if (inet->daddr) {
 211 +                               if (inet->daddr != saddr)
 212 +                                       continue;
 213 +                               score+=2;
 214 +                       }
 215 +                       if (inet->dport) {
 216 +                               if (inet->dport != sport)
 217 +                                       continue;
 218 +                               score+=2;
 219 +                       }
 220 +                       if (sk->sk_bound_dev_if) {
 221 +                               if (sk->sk_bound_dev_if != dif)
 222 +                                       continue;
 223 +                               score+=2;
 224 +                       }
 225 +                       if (score == 9) {
 226 +                               result = sk;
 227 +                               break;
 228 +                       } else if (score > badness) {
 229 +                               result = sk;
 230 +                               badness = score;
 231 +                       }
 232 +               }
 233 +       }
 234 +
 235 +       if (result)
 236 +               sock_hold(result);
 237 +       read_unlock(&udp_hash_lock);
 238 +       return result;
 239 +}
 240 +
 241 +int onceonly = 1;
 242 +
 243  static unsigned int
 244  mark_tg(struct sk_buff *skb, const struct net_device *in,
 245          const struct net_device *out, unsigned int hooknum,
 246          const struct xt_target *target, const void *targinfo)
 247  {
 248         const struct xt_mark_tginfo2 *info = targinfo;
 249 +    long mark = -1;
 250 +    enum ip_conntrack_info ctinfo;
 251 +    struct sock *connection_sk;
 252 +    int dif;
 253 +    struct nf_conn *ct;
 254 +    extern struct inet_hashinfo tcp_hashinfo;
 255 +    enum ip_conntrack_dir dir;
 256 +    int *curtag;
 257 +    u_int32_t src_ip;
 258 +    u_int32_t dst_ip;
 259 +    u_int16_t proto, src_port;
 260 +    u_int32_t ip;
 261 +    u_int16_t port;
 262 +
 263 +
 264 +    if (info->mark == ~0U) {
 265 +        // As of 2.6.27.39, Dec 8 2009,
 266 +        // NetNS + VNET = Trouble
 267 +        // Let's handle this as a special case
 268 +        struct net *net = dev_net(skb->dev);
 269 +        if (!net_eq(net, &init_net)) {
 270 +            WARN_ON(onceonly);
 271 +            onceonly = 0;
 272 +            return XT_CONTINUE;
 273 +        }
 274 +
 275 +        /* copy-xid */
 276 +        dif = ((struct rtable *)(skb->dst))->rt_iif;
 277 +
 278 +        ct = nf_ct_get(skb, &ctinfo);
 279 +        if (!ct)
 280 +            goto out_mark_finish;
 281 +
 282 +        dir = CTINFO2DIR(ctinfo);
 283 +        src_ip = ct->tuplehash[dir].tuple.src.u3.ip;
 284 +        dst_ip = ct->tuplehash[dir].tuple.dst.u3.ip;
 285 +        src_port = get_src_port(&ct->tuplehash[dir].tuple);
 286 +        proto = ct->tuplehash[dir].tuple.dst.protonum;
 287 +
 288 +        ip = ct->tuplehash[dir].tuple.dst.u3.ip;
 289 +        port = get_dst_port(&ct->tuplehash[dir].tuple);
 290 +
 291 +        if (proto == 1) {
 292 +            if (skb->mark > 0)
 293 +                /* The packet is marked, it's going out */
 294 +                ct->xid[0] = skb->mark;
 295 +
 296 +            if (ct->xid[0] > 0)
 297 +                mark = ct->xid[0];
 298 +        }
 299 +        else if (proto == 17) {
 300 +            struct sock *sk;
 301 +            if (!skb->mark) {
 302 +                sk = __udp4_lib_lookup(net,src_ip, src_port,
 303 +                        ip, port, dif, udp_hash);
 304 +
 305 +                if (sk && hooknum == NF_INET_LOCAL_IN)
 306 +                    mark = sk->sk_nid;
 307 +
 308 +                if (sk)
 309 +                    sock_put(sk);
 310 +            }
 311 +            else if (skb->mark > 0)
 312 +                /* The packet is marked, it's going out */
 313 +                ct->xid[0] = skb->mark;
 314 +        }
 315 +        else if (proto == 6) /* TCP */{
 316 +            int sockettype = 0; /* Established socket */
 317 +
 318 +            /* Looks for an established socket or a listening
 319 +               socket corresponding to the 4-tuple, in that order.
 320 +               The order is important for Codemux connections
 321 +               to be handled properly */
 322 +
 323 +            connection_sk = inet_lookup_established(net,
 324 +                    &tcp_hashinfo, src_ip, src_port, ip, port, dif);
 325 +
 326 +            if (!connection_sk) {
 327 +                connection_sk = inet_lookup_listener(net,
 328 +                        &tcp_hashinfo, ip, port, dif);
 329 +                sockettype = 1; /* Listening socket */
 330 +            }
 331 +
 332 +            if (connection_sk) {
 333 +                if (connection_sk->sk_state == TCP_TIME_WAIT) {
 334 +                    inet_twsk_put(inet_twsk(connection_sk));
 335 +                    goto out_mark_finish;
 336 +                }
 337 +
 338 +                /* The peercred is not set. We set it if the other side has an xid. */
 339 +                if (!PEERCRED_SET(connection_sk->sk_peercred.uid)
 340 +                        && ct->xid[!dir] > 0 && (sockettype == 0)) {
 341 +                    connection_sk->sk_peercred.gid =
 342 +                        connection_sk->sk_peercred.uid = ct->xid[!dir];
 343 +                }
 344 +
 345 +                /* The peercred is set, and is not equal to the XID of 'the other side' */
 346 +                else if (PEERCRED_SET(connection_sk->sk_peercred.uid) &&
 347 +                        (connection_sk->sk_peercred.uid != ct->xid[!dir]) &&
 348 +                        (sockettype == 0)) {
 349 +                    mark = connection_sk->sk_peercred.uid;
 350 +                }
 351 +
 352 +                /* Has this connection already been tagged? */
 353 +                if (ct->xid[dir] < 1) {
 354 +                    /* No - let's tag it */
 355 +                    ct->xid[dir]=connection_sk->sk_nid;
 356 +                }
 357 +
 358 +                if (mark == -1 && (ct->xid[dir] != 0))
 359 +                    mark = ct->xid[dir];
 360 +
 361 +                sock_put(connection_sk);
 362 +            }
 363 +
 364 +            /* All else failed. Is this a connection over raw sockets?
 365 +               That explains why we couldn't get anything out of skb->sk,
 366 +               or look up a "real" connection. */
 367 +            if (ct->xid[dir] < 1) {
 368 +                if (skb->skb_tag)
 369 +                    ct->xid[dir] = skb->skb_tag;
 370 +            }
 371 +
 372 +            /* Covers CoDemux case */
 373 +            if (mark < 1 && (ct->xid[dir] > 0))
 374 +                mark = ct->xid[dir];
 375 +
 376 +            if (mark < 1 && (ct->xid[!dir] > 0))
 377 +                mark = ct->xid[!dir];
 378 +            goto out_mark_finish;
 379 +        }
 380 +    }
 381 +    else
 382 +        mark = (skb->mark & ~info->mask) ^ info->mark;
 383 +
 384 +out_mark_finish:
 385 +    if (mark != -1)
 386 +        skb->mark = mark;
 387 +
 388 +    curtag = &__get_cpu_var(sknid_elevator);
 389 +    if (mark > 0 && *curtag == -2 && hooknum == NF_INET_LOCAL_IN)
 390 +        *curtag = mark;
 391
 392 -       skb->mark = (skb->mark & ~info->mask) ^ info->mark;
 393         return XT_CONTINUE;
 394  }
 395
 396 diff -Nurb linux-2.6.27-521/net/netfilter/xt_SETXID.c linux-2.6.27-522/net/netfilter/xt_SETXID.c
 397 --- linux-2.6.27-521/net/netfilter/xt_SETXID.c  1969-12-31 19:00:00.000000000 -0500
 398 +++ linux-2.6.27-522/net/netfilter/xt_SETXID.c  2009-12-10 12:09:35.000000000 -0500
 399 @@ -0,0 +1,79 @@
 400 +#include <linux/module.h>
 401 +#include <linux/skbuff.h>
 402 +#include <linux/ip.h>
 403 +#include <net/checksum.h>
 404 +#include <linux/vs_network.h>
 405 +
 406 +#include <linux/netfilter/x_tables.h>
 407 +#include <linux/netfilter/xt_SETXID.h>
 408 +
 409 +MODULE_LICENSE("GPL");
 410 +MODULE_AUTHOR("");
 411 +MODULE_DESCRIPTION("");
 412 +MODULE_ALIAS("ipt_SETXID");
 413 +
 414 +static unsigned int
 415 +target_v1(struct sk_buff **pskb,
 416 +         const struct net_device *in,
 417 +         const struct net_device *out,
 418 +         unsigned int hooknum,
 419 +         const struct xt_target *target,
 420 +         const void *targinfo)
 421 +{
 422 +       const struct xt_setxid_target_info_v1 *setxidinfo = targinfo;
 423 +
 424 +       switch (setxidinfo->mode) {
 425 +       case XT_SET_PACKET_XID:
 426 +                (*pskb)->skb_tag = setxidinfo->mark;
 427 +               break;
 428 +       }
 429 +       return XT_CONTINUE;
 430 +}
 431 +
 432 +
 433 +static int
 434 +checkentry_v1(const char *tablename,
 435 +             const void *entry,
 436 +             const struct xt_target *target,
 437 +             void *targinfo,
 438 +             unsigned int hook_mask)
 439 +{
 440 +       struct xt_setxid_target_info_v1 *setxidinfo = targinfo;
 441 +
 442 +       if (setxidinfo->mode != XT_SET_PACKET_XID) {
 443 +               printk(KERN_WARNING "SETXID: unknown mode %u\n",
 444 +                      setxidinfo->mode);
 445 +               return 0;
 446 +       }
 447 +
 448 +       return 1;
 449 +}
 450 +
 451 +static struct xt_target xt_setxid_target[] = {
 452 +       {
 453 +               .name           = "SETXID",
 454 +               .family         = AF_INET,
 455 +               .revision       = 1,
 456 +               .checkentry     = checkentry_v1,
 457 +               .target         = target_v1,
 458 +               .targetsize     = sizeof(struct xt_setxid_target_info_v1),
 459 +               .table          = "mangle",
 460 +               .me             = THIS_MODULE,
 461 +       }
 462 +};
 463 +
 464 +static int __init init(void)
 465 +{
 466 +       int err;
 467 +
 468 +       err = xt_register_targets(xt_setxid_target, ARRAY_SIZE(xt_setxid_target));
 469 +       return err;
 470 +}
 471 +
 472 +static void __exit fini(void)
 473 +{
 474 +       xt_unregister_targets(xt_setxid_target, ARRAY_SIZE(xt_setxid_target));
 475 +}
 476 +
 477 +module_init(init);
 478 +module_exit(fini);