target/linux/generic-2.6/patches-2.6.22/201-multiple_default_gateways.patch

   1 diff -urN linux-2.6.21.1.old/include/linux/rtnetlink.h linux-2.6.21.1.dev/include/linux/rtnetlink.h
   2 --- linux-2.6.21.1.old/include/linux/rtnetlink.h        2007-04-27 23:49:26.000000000 +0200
   3 +++ linux-2.6.21.1.dev/include/linux/rtnetlink.h        2007-05-26 20:46:11.883321560 +0200
   4 @@ -293,6 +293,8 @@
   5  #define RTNH_F_DEAD            1       /* Nexthop is dead (used by multipath)  */
   6  #define RTNH_F_PERVASIVE       2       /* Do recursive gateway lookup  */
   7  #define RTNH_F_ONLINK          4       /* Gateway is forced on link    */
   8 +#define RTNH_F_SUSPECT         8       /* We don't know the real state */
   9 +#define RTNH_F_BADSTATE                (RTNH_F_DEAD | RTNH_F_SUSPECT)
  10
  11  /* Macros to handle hexthops */
  12
  13 diff -urN linux-2.6.21.1.old/include/net/flow.h linux-2.6.21.1.dev/include/net/flow.h
  14 --- linux-2.6.21.1.old/include/net/flow.h       2007-04-27 23:49:26.000000000 +0200
  15 +++ linux-2.6.21.1.dev/include/net/flow.h       2007-05-26 20:46:11.922315632 +0200
  16 @@ -19,6 +19,8 @@
  17                 struct {
  18                         __be32                  daddr;
  19                         __be32                  saddr;
  20 +                       __u32                   lsrc;
  21 +                       __u32                   gw;
  22                         __u8                    tos;
  23                         __u8                    scope;
  24                 } ip4_u;
  25 @@ -43,6 +45,8 @@
  26  #define fl6_flowlabel  nl_u.ip6_u.flowlabel
  27  #define fl4_dst                nl_u.ip4_u.daddr
  28  #define fl4_src                nl_u.ip4_u.saddr
  29 +#define fl4_lsrc        nl_u.ip4_u.lsrc
  30 +#define fl4_gw         nl_u.ip4_u.gw
  31  #define fl4_tos                nl_u.ip4_u.tos
  32  #define fl4_scope      nl_u.ip4_u.scope
  33
  34 diff -urN linux-2.6.21.1.old/net/ipv4/route.c linux-2.6.21.1.dev/net/ipv4/route.c
  35 --- linux-2.6.21.1.old/net/ipv4/route.c 2007-04-27 23:49:26.000000000 +0200
  36 +++ linux-2.6.21.1.dev/net/ipv4/route.c 2007-05-26 20:46:11.967308792 +0200
  37 @@ -1208,6 +1208,7 @@
  38
  39                                 /* Gateway is different ... */
  40                                 rt->rt_gateway          = new_gw;
  41 +                               if (rt->fl.fl4_gw) rt->fl.fl4_gw = new_gw;
  42
  43                                 /* Redirect received -> path was valid */
  44                                 dst_confirm(&rth->u.dst);
  45 @@ -1643,6 +1644,7 @@
  46         rth->fl.fl4_tos = tos;
  47         rth->fl.mark    = skb->mark;
  48         rth->fl.fl4_src = saddr;
  49 +       rth->fl.fl4_lsrc = 0;
  50         rth->rt_src     = saddr;
  51  #ifdef CONFIG_NET_CLS_ROUTE
  52         rth->u.dst.tclassid = itag;
  53 @@ -1653,6 +1655,7 @@
  54         dev_hold(rth->u.dst.dev);
  55         rth->idev       = in_dev_get(rth->u.dst.dev);
  56         rth->fl.oif     = 0;
  57 +       rth->fl.fl4_gw  = 0;
  58         rth->rt_gateway = daddr;
  59         rth->rt_spec_dst= spec_dst;
  60         rth->rt_type    = RTN_MULTICAST;
  61 @@ -1716,7 +1719,7 @@
  62  static inline int __mkroute_input(struct sk_buff *skb,
  63                                   struct fib_result* res,
  64                                   struct in_device *in_dev,
  65 -                                 __be32 daddr, __be32 saddr, u32 tos,
  66 +                                 __be32 daddr, __be32 saddr, u32 tos, u32 lsrc,
  67                                   struct rtable **result)
  68  {
  69
  70 @@ -1751,6 +1754,7 @@
  71                 flags |= RTCF_DIRECTSRC;
  72
  73         if (out_dev == in_dev && err && !(flags & (RTCF_NAT | RTCF_MASQ)) &&
  74 +           !lsrc &&
  75             (IN_DEV_SHARED_MEDIA(out_dev) ||
  76              inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res))))
  77                 flags |= RTCF_DOREDIRECT;
  78 @@ -1788,6 +1792,7 @@
  79         rth->fl.mark    = skb->mark;
  80         rth->fl.fl4_src = saddr;
  81         rth->rt_src     = saddr;
  82 +       rth->fl.fl4_lsrc        = lsrc;
  83         rth->rt_gateway = daddr;
  84         rth->rt_iif     =
  85                 rth->fl.iif     = in_dev->dev->ifindex;
  86 @@ -1795,6 +1800,7 @@
  87         dev_hold(rth->u.dst.dev);
  88         rth->idev       = in_dev_get(rth->u.dst.dev);
  89         rth->fl.oif     = 0;
  90 +       rth->fl.fl4_gw  = 0;
  91         rth->rt_spec_dst= spec_dst;
  92
  93         rth->u.dst.input = ip_forward;
  94 @@ -1816,19 +1822,21 @@
  95                                        struct fib_result* res,
  96                                        const struct flowi *fl,
  97                                        struct in_device *in_dev,
  98 -                                      __be32 daddr, __be32 saddr, u32 tos)
  99 +                                      __be32 daddr, __be32 saddr, u32 tos,
 100 +                                      u32 lsrc)
 101  {
 102         struct rtable* rth = NULL;
 103         int err;
 104         unsigned hash;
 105
 106 +       fib_select_default(fl, res);
 107  #ifdef CONFIG_IP_ROUTE_MULTIPATH
 108 -       if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0)
 109 +       if (res->fi && res->fi->fib_nhs > 1)
 110                 fib_select_multipath(fl, res);
 111  #endif
 112
 113         /* create a routing cache entry */
 114 -       err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth);
 115 +       err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, lsrc, &rth);
 116         if (err)
 117                 return err;
 118
 119 @@ -1841,7 +1849,8 @@
 120                                    struct fib_result* res,
 121                                    const struct flowi *fl,
 122                                    struct in_device *in_dev,
 123 -                                  __be32 daddr, __be32 saddr, u32 tos)
 124 +                                  __be32 daddr, __be32 saddr, u32 tos,
 125 +                                  u32 lsrc)
 126  {
 127  #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
 128         struct rtable* rth = NULL, *rtres;
 129 @@ -1857,7 +1866,7 @@
 130         /* distinguish between multipath and singlepath */
 131         if (hopcount < 2)
 132                 return ip_mkroute_input_def(skb, res, fl, in_dev, daddr,
 133 -                                           saddr, tos);
 134 +                                           saddr, tos, 0);
 135
 136         /* add all alternatives to the routing cache */
 137         for (hop = 0; hop < hopcount; hop++) {
 138 @@ -1869,7 +1878,7 @@
 139
 140                 /* create a routing cache entry */
 141                 err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos,
 142 -                                     &rth);
 143 +                                     0, &rth);
 144                 if (err)
 145                         return err;
 146
 147 @@ -1889,7 +1898,7 @@
 148         skb->dst = &rtres->u.dst;
 149         return err;
 150  #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED  */
 151 -       return ip_mkroute_input_def(skb, res, fl, in_dev, daddr, saddr, tos);
 152 +       return ip_mkroute_input_def(skb, res, fl, in_dev, daddr, saddr, tos, lsrc);
 153  #endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED  */
 154  }
 155
 156 @@ -1905,18 +1914,18 @@
 157   */
 158
 159  static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 160 -                              u8 tos, struct net_device *dev)
 161 +                              u8 tos, struct net_device *dev, u32 lsrc)
 162  {
 163         struct fib_result res;
 164         struct in_device *in_dev = in_dev_get(dev);
 165         struct flowi fl = { .nl_u = { .ip4_u =
 166                                       { .daddr = daddr,
 167 -                                       .saddr = saddr,
 168 +                                       .saddr = lsrc ? : saddr,
 169                                         .tos = tos,
 170                                         .scope = RT_SCOPE_UNIVERSE,
 171                                       } },
 172                             .mark = skb->mark,
 173 -                           .iif = dev->ifindex };
 174 +                           .iif = lsrc? loopback_dev.ifindex : dev->ifindex };
 175         unsigned        flags = 0;
 176         u32             itag = 0;
 177         struct rtable * rth;
 178 @@ -1949,6 +1958,12 @@
 179         if (BADCLASS(daddr) || ZERONET(daddr) || LOOPBACK(daddr))
 180                 goto martian_destination;
 181
 182 +       if (lsrc) {
 183 +               if (MULTICAST(lsrc) || BADCLASS(lsrc) ||
 184 +                   ZERONET(lsrc) || LOOPBACK(lsrc))
 185 +                       goto e_inval;
 186 +       }
 187 +
 188         /*
 189          *      Now we are ready to route packet.
 190          */
 191 @@ -1958,6 +1973,10 @@
 192                 goto no_route;
 193         }
 194         free_res = 1;
 195 +       if (lsrc && res.type != RTN_UNICAST && res.type != RTN_NAT)
 196 +               goto e_inval;
 197 +       fl.iif = dev->ifindex;
 198 +       fl.fl4_src = saddr;
 199
 200         RT_CACHE_STAT_INC(in_slow_tot);
 201
 202 @@ -1982,7 +2001,7 @@
 203         if (res.type != RTN_UNICAST)
 204                 goto martian_destination;
 205
 206 -       err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos);
 207 +       err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos, lsrc);
 208         if (err == -ENOBUFS)
 209                 goto e_nobufs;
 210         if (err == -EINVAL)
 211 @@ -1997,6 +2016,8 @@
 212  brd_input:
 213         if (skb->protocol != htons(ETH_P_IP))
 214                 goto e_inval;
 215 +       if (lsrc)
 216 +               goto e_inval;
 217
 218         if (ZERONET(saddr))
 219                 spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK);
 220 @@ -2037,6 +2058,7 @@
 221         rth->u.dst.dev  = &loopback_dev;
 222         dev_hold(rth->u.dst.dev);
 223         rth->idev       = in_dev_get(rth->u.dst.dev);
 224 +       rth->fl.fl4_gw  = 0;
 225         rth->rt_gateway = daddr;
 226         rth->rt_spec_dst= spec_dst;
 227         rth->u.dst.input= ip_local_deliver;
 228 @@ -2086,8 +2108,9 @@
 229         goto e_inval;
 230  }
 231
 232 -int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 233 -                  u8 tos, struct net_device *dev)
 234 +static inline int
 235 +ip_route_input_cached(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 236 +                  u8 tos, struct net_device *dev, u32 lsrc)
 237  {
 238         struct rtable * rth;
 239         unsigned        hash;
 240 @@ -2102,6 +2125,7 @@
 241                 if (rth->fl.fl4_dst == daddr &&
 242                     rth->fl.fl4_src == saddr &&
 243                     rth->fl.iif == iif &&
 244 +                   rth->fl.fl4_lsrc == lsrc &&
 245                     rth->fl.oif == 0 &&
 246                     rth->fl.mark == skb->mark &&
 247                     rth->fl.fl4_tos == tos) {
 248 @@ -2148,7 +2172,19 @@
 249                 rcu_read_unlock();
 250                 return -EINVAL;
 251         }
 252 -       return ip_route_input_slow(skb, daddr, saddr, tos, dev);
 253 +       return ip_route_input_slow(skb, daddr, saddr, tos, dev, lsrc);
 254 +}
 255 +
 256 +int ip_route_input(struct sk_buff *skb, u32 daddr, u32 saddr,
 257 +                  u8 tos, struct net_device *dev)
 258 +{
 259 +       return ip_route_input_cached(skb, daddr, saddr, tos, dev, 0);
 260 +}
 261 +
 262 +int ip_route_input_lookup(struct sk_buff *skb, u32 daddr, u32 saddr,
 263 +                         u8 tos, struct net_device *dev, u32 lsrc)
 264 +{
 265 +       return ip_route_input_cached(skb, daddr, saddr, tos, dev, lsrc);
 266  }
 267
 268  static inline int __mkroute_output(struct rtable **result,
 269 @@ -2227,6 +2263,7 @@
 270         rth->fl.fl4_tos = tos;
 271         rth->fl.fl4_src = oldflp->fl4_src;
 272         rth->fl.oif     = oldflp->oif;
 273 +       rth->fl.fl4_gw  = oldflp->fl4_gw;
 274         rth->fl.mark    = oldflp->mark;
 275         rth->rt_dst     = fl->fl4_dst;
 276         rth->rt_src     = fl->fl4_src;
 277 @@ -2367,6 +2404,7 @@
 278         struct flowi fl = { .nl_u = { .ip4_u =
 279                                       { .daddr = oldflp->fl4_dst,
 280                                         .saddr = oldflp->fl4_src,
 281 +                                       .gw = oldflp->fl4_gw,
 282                                         .tos = tos & IPTOS_RT_MASK,
 283                                         .scope = ((tos & RTO_ONLINK) ?
 284                                                   RT_SCOPE_LINK :
 285 @@ -2470,6 +2508,7 @@
 286                 dev_out = &loopback_dev;
 287                 dev_hold(dev_out);
 288                 fl.oif = loopback_dev.ifindex;
 289 +               fl.fl4_gw = 0;
 290                 res.type = RTN_LOCAL;
 291                 flags |= RTCF_LOCAL;
 292                 goto make_route;
 293 @@ -2477,7 +2516,7 @@
 294
 295         if (fib_lookup(&fl, &res)) {
 296                 res.fi = NULL;
 297 -               if (oldflp->oif) {
 298 +               if (oldflp->oif && dev_out->flags & IFF_UP) {
 299                         /* Apparently, routing tables are wrong. Assume,
 300                            that the destination is on link.
 301
 302 @@ -2517,6 +2556,7 @@
 303                 dev_out = &loopback_dev;
 304                 dev_hold(dev_out);
 305                 fl.oif = dev_out->ifindex;
 306 +               fl.fl4_gw = 0;
 307                 if (res.fi)
 308                         fib_info_put(res.fi);
 309                 res.fi = NULL;
 310 @@ -2524,13 +2564,12 @@
 311                 goto make_route;
 312         }
 313
 314 +       if (res.type == RTN_UNICAST)
 315 +               fib_select_default(&fl, &res);
 316  #ifdef CONFIG_IP_ROUTE_MULTIPATH
 317 -       if (res.fi->fib_nhs > 1 && fl.oif == 0)
 318 +       if (res.fi->fib_nhs > 1)
 319                 fib_select_multipath(&fl, &res);
 320 -       else
 321  #endif
 322 -       if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif)
 323 -               fib_select_default(&fl, &res);
 324
 325         if (!fl.fl4_src)
 326                 fl.fl4_src = FIB_RES_PREFSRC(res);
 327 @@ -2567,6 +2606,7 @@
 328                     rth->fl.fl4_src == flp->fl4_src &&
 329                     rth->fl.iif == 0 &&
 330                     rth->fl.oif == flp->oif &&
 331 +                   rth->fl.fl4_gw == flp->fl4_gw &&
 332                     rth->fl.mark == flp->mark &&
 333                     !((rth->fl.fl4_tos ^ flp->fl4_tos) &
 334                             (IPTOS_RT_MASK | RTO_ONLINK))) {
 335 @@ -3271,3 +3311,4 @@
 336  EXPORT_SYMBOL(__ip_select_ident);
 337  EXPORT_SYMBOL(ip_route_input);
 338  EXPORT_SYMBOL(ip_route_output_key);
 339 +EXPORT_SYMBOL(ip_route_input_lookup);