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

   1 Index: linux-2.6.22.19/include/linux/rtnetlink.h
   2 ===================================================================
   3 --- linux-2.6.22.19.orig/include/linux/rtnetlink.h
   4 +++ linux-2.6.22.19/include/linux/rtnetlink.h
   5 @@ -293,6 +293,8 @@ struct rtnexthop
   6  #define RTNH_F_DEAD            1       /* Nexthop is dead (used by multipath)  */
   7  #define RTNH_F_PERVASIVE       2       /* Do recursive gateway lookup  */
   8  #define RTNH_F_ONLINK          4       /* Gateway is forced on link    */
   9 +#define RTNH_F_SUSPECT         8       /* We don't know the real state */
  10 +#define RTNH_F_BADSTATE                (RTNH_F_DEAD | RTNH_F_SUSPECT)
  11
  12  /* Macros to handle hexthops */
  13
  14 Index: linux-2.6.22.19/include/net/flow.h
  15 ===================================================================
  16 --- linux-2.6.22.19.orig/include/net/flow.h
  17 +++ linux-2.6.22.19/include/net/flow.h
  18 @@ -19,6 +19,8 @@ struct flowi {
  19                 struct {
  20                         __be32                  daddr;
  21                         __be32                  saddr;
  22 +                       __u32                   lsrc;
  23 +                       __u32                   gw;
  24                         __u8                    tos;
  25                         __u8                    scope;
  26                 } ip4_u;
  27 @@ -43,6 +45,8 @@ struct flowi {
  28  #define fl6_flowlabel  nl_u.ip6_u.flowlabel
  29  #define fl4_dst                nl_u.ip4_u.daddr
  30  #define fl4_src                nl_u.ip4_u.saddr
  31 +#define fl4_lsrc        nl_u.ip4_u.lsrc
  32 +#define fl4_gw         nl_u.ip4_u.gw
  33  #define fl4_tos                nl_u.ip4_u.tos
  34  #define fl4_scope      nl_u.ip4_u.scope
  35
  36 Index: linux-2.6.22.19/net/ipv4/route.c
  37 ===================================================================
  38 --- linux-2.6.22.19.orig/net/ipv4/route.c
  39 +++ linux-2.6.22.19/net/ipv4/route.c
  40 @@ -1208,6 +1208,7 @@ void ip_rt_redirect(__be32 old_gw, __be3
  41
  42                                 /* Gateway is different ... */
  43                                 rt->rt_gateway          = new_gw;
  44 +                               if (rt->fl.fl4_gw) rt->fl.fl4_gw = new_gw;
  45
  46                                 /* Redirect received -> path was valid */
  47                                 dst_confirm(&rth->u.dst);
  48 @@ -1643,6 +1644,7 @@ static int ip_route_input_mc(struct sk_b
  49         rth->fl.fl4_tos = tos;
  50         rth->fl.mark    = skb->mark;
  51         rth->fl.fl4_src = saddr;
  52 +       rth->fl.fl4_lsrc = 0;
  53         rth->rt_src     = saddr;
  54  #ifdef CONFIG_NET_CLS_ROUTE
  55         rth->u.dst.tclassid = itag;
  56 @@ -1653,6 +1655,7 @@ static int ip_route_input_mc(struct sk_b
  57         dev_hold(rth->u.dst.dev);
  58         rth->idev       = in_dev_get(rth->u.dst.dev);
  59         rth->fl.oif     = 0;
  60 +       rth->fl.fl4_gw  = 0;
  61         rth->rt_gateway = daddr;
  62         rth->rt_spec_dst= spec_dst;
  63         rth->rt_type    = RTN_MULTICAST;
  64 @@ -1716,7 +1719,7 @@ static void ip_handle_martian_source(str
  65  static inline int __mkroute_input(struct sk_buff *skb,
  66                                   struct fib_result* res,
  67                                   struct in_device *in_dev,
  68 -                                 __be32 daddr, __be32 saddr, u32 tos,
  69 +                                 __be32 daddr, __be32 saddr, u32 tos, u32 lsrc,
  70                                   struct rtable **result)
  71  {
  72
  73 @@ -1751,6 +1754,7 @@ static inline int __mkroute_input(struct
  74                 flags |= RTCF_DIRECTSRC;
  75
  76         if (out_dev == in_dev && err && !(flags & (RTCF_NAT | RTCF_MASQ)) &&
  77 +           !lsrc &&
  78             (IN_DEV_SHARED_MEDIA(out_dev) ||
  79              inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res))))
  80                 flags |= RTCF_DOREDIRECT;
  81 @@ -1788,6 +1792,7 @@ static inline int __mkroute_input(struct
  82         rth->fl.mark    = skb->mark;
  83         rth->fl.fl4_src = saddr;
  84         rth->rt_src     = saddr;
  85 +       rth->fl.fl4_lsrc        = lsrc;
  86         rth->rt_gateway = daddr;
  87         rth->rt_iif     =
  88                 rth->fl.iif     = in_dev->dev->ifindex;
  89 @@ -1795,6 +1800,7 @@ static inline int __mkroute_input(struct
  90         dev_hold(rth->u.dst.dev);
  91         rth->idev       = in_dev_get(rth->u.dst.dev);
  92         rth->fl.oif     = 0;
  93 +       rth->fl.fl4_gw  = 0;
  94         rth->rt_spec_dst= spec_dst;
  95
  96         rth->u.dst.input = ip_forward;
  97 @@ -1816,19 +1822,21 @@ static inline int ip_mkroute_input_def(s
  98                                        struct fib_result* res,
  99                                        const struct flowi *fl,
 100                                        struct in_device *in_dev,
 101 -                                      __be32 daddr, __be32 saddr, u32 tos)
 102 +                                      __be32 daddr, __be32 saddr, u32 tos,
 103 +                                      u32 lsrc)
 104  {
 105         struct rtable* rth = NULL;
 106         int err;
 107         unsigned hash;
 108
 109 +       fib_select_default(fl, res);
 110  #ifdef CONFIG_IP_ROUTE_MULTIPATH
 111 -       if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0)
 112 +       if (res->fi && res->fi->fib_nhs > 1)
 113                 fib_select_multipath(fl, res);
 114  #endif
 115
 116         /* create a routing cache entry */
 117 -       err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth);
 118 +       err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, lsrc, &rth);
 119         if (err)
 120                 return err;
 121
 122 @@ -1841,7 +1849,8 @@ static inline int ip_mkroute_input(struc
 123                                    struct fib_result* res,
 124                                    const struct flowi *fl,
 125                                    struct in_device *in_dev,
 126 -                                  __be32 daddr, __be32 saddr, u32 tos)
 127 +                                  __be32 daddr, __be32 saddr, u32 tos,
 128 +                                  u32 lsrc)
 129  {
 130  #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
 131         struct rtable* rth = NULL, *rtres;
 132 @@ -1857,7 +1866,7 @@ static inline int ip_mkroute_input(struc
 133         /* distinguish between multipath and singlepath */
 134         if (hopcount < 2)
 135                 return ip_mkroute_input_def(skb, res, fl, in_dev, daddr,
 136 -                                           saddr, tos);
 137 +                                           saddr, tos, 0);
 138
 139         /* add all alternatives to the routing cache */
 140         for (hop = 0; hop < hopcount; hop++) {
 141 @@ -1869,7 +1878,7 @@ static inline int ip_mkroute_input(struc
 142
 143                 /* create a routing cache entry */
 144                 err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos,
 145 -                                     &rth);
 146 +                                     0, &rth);
 147                 if (err)
 148                         return err;
 149
 150 @@ -1889,7 +1898,7 @@ static inline int ip_mkroute_input(struc
 151         skb->dst = &rtres->u.dst;
 152         return err;
 153  #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED  */
 154 -       return ip_mkroute_input_def(skb, res, fl, in_dev, daddr, saddr, tos);
 155 +       return ip_mkroute_input_def(skb, res, fl, in_dev, daddr, saddr, tos, lsrc);
 156  #endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED  */
 157  }
 158
 159 @@ -1905,18 +1914,18 @@ static inline int ip_mkroute_input(struc
 160   */
 161
 162  static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 163 -                              u8 tos, struct net_device *dev)
 164 +                              u8 tos, struct net_device *dev, u32 lsrc)
 165  {
 166         struct fib_result res;
 167         struct in_device *in_dev = in_dev_get(dev);
 168         struct flowi fl = { .nl_u = { .ip4_u =
 169                                       { .daddr = daddr,
 170 -                                       .saddr = saddr,
 171 +                                       .saddr = lsrc ? : saddr,
 172                                         .tos = tos,
 173                                         .scope = RT_SCOPE_UNIVERSE,
 174                                       } },
 175                             .mark = skb->mark,
 176 -                           .iif = dev->ifindex };
 177 +                           .iif = lsrc? loopback_dev.ifindex : dev->ifindex };
 178         unsigned        flags = 0;
 179         u32             itag = 0;
 180         struct rtable * rth;
 181 @@ -1949,6 +1958,12 @@ static int ip_route_input_slow(struct sk
 182         if (BADCLASS(daddr) || ZERONET(daddr) || LOOPBACK(daddr))
 183                 goto martian_destination;
 184
 185 +       if (lsrc) {
 186 +               if (MULTICAST(lsrc) || BADCLASS(lsrc) ||
 187 +                   ZERONET(lsrc) || LOOPBACK(lsrc))
 188 +                       goto e_inval;
 189 +       }
 190 +
 191         /*
 192          *      Now we are ready to route packet.
 193          */
 194 @@ -1958,6 +1973,10 @@ static int ip_route_input_slow(struct sk
 195                 goto no_route;
 196         }
 197         free_res = 1;
 198 +       if (lsrc && res.type != RTN_UNICAST && res.type != RTN_NAT)
 199 +               goto e_inval;
 200 +       fl.iif = dev->ifindex;
 201 +       fl.fl4_src = saddr;
 202
 203         RT_CACHE_STAT_INC(in_slow_tot);
 204
 205 @@ -1982,7 +2001,7 @@ static int ip_route_input_slow(struct sk
 206         if (res.type != RTN_UNICAST)
 207                 goto martian_destination;
 208
 209 -       err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos);
 210 +       err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos, lsrc);
 211         if (err == -ENOBUFS)
 212                 goto e_nobufs;
 213         if (err == -EINVAL)
 214 @@ -1997,6 +2016,8 @@ out:      return err;
 215  brd_input:
 216         if (skb->protocol != htons(ETH_P_IP))
 217                 goto e_inval;
 218 +       if (lsrc)
 219 +               goto e_inval;
 220
 221         if (ZERONET(saddr))
 222                 spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK);
 223 @@ -2037,6 +2058,7 @@ local_input:
 224         rth->u.dst.dev  = &loopback_dev;
 225         dev_hold(rth->u.dst.dev);
 226         rth->idev       = in_dev_get(rth->u.dst.dev);
 227 +       rth->fl.fl4_gw  = 0;
 228         rth->rt_gateway = daddr;
 229         rth->rt_spec_dst= spec_dst;
 230         rth->u.dst.input= ip_local_deliver;
 231 @@ -2086,8 +2108,9 @@ martian_source:
 232         goto e_inval;
 233  }
 234
 235 -int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 236 -                  u8 tos, struct net_device *dev)
 237 +static inline int
 238 +ip_route_input_cached(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 239 +                  u8 tos, struct net_device *dev, u32 lsrc)
 240  {
 241         struct rtable * rth;
 242         unsigned        hash;
 243 @@ -2102,6 +2125,7 @@ int ip_route_input(struct sk_buff *skb,
 244                 if (rth->fl.fl4_dst == daddr &&
 245                     rth->fl.fl4_src == saddr &&
 246                     rth->fl.iif == iif &&
 247 +                   rth->fl.fl4_lsrc == lsrc &&
 248                     rth->fl.oif == 0 &&
 249                     rth->fl.mark == skb->mark &&
 250                     rth->fl.fl4_tos == tos) {
 251 @@ -2148,7 +2172,19 @@ int ip_route_input(struct sk_buff *skb,
 252                 rcu_read_unlock();
 253                 return -EINVAL;
 254         }
 255 -       return ip_route_input_slow(skb, daddr, saddr, tos, dev);
 256 +       return ip_route_input_slow(skb, daddr, saddr, tos, dev, lsrc);
 257 +}
 258 +
 259 +int ip_route_input(struct sk_buff *skb, u32 daddr, u32 saddr,
 260 +                  u8 tos, struct net_device *dev)
 261 +{
 262 +       return ip_route_input_cached(skb, daddr, saddr, tos, dev, 0);
 263 +}
 264 +
 265 +int ip_route_input_lookup(struct sk_buff *skb, u32 daddr, u32 saddr,
 266 +                         u8 tos, struct net_device *dev, u32 lsrc)
 267 +{
 268 +       return ip_route_input_cached(skb, daddr, saddr, tos, dev, lsrc);
 269  }
 270
 271  static inline int __mkroute_output(struct rtable **result,
 272 @@ -2227,6 +2263,7 @@ static inline int __mkroute_output(struc
 273         rth->fl.fl4_tos = tos;
 274         rth->fl.fl4_src = oldflp->fl4_src;
 275         rth->fl.oif     = oldflp->oif;
 276 +       rth->fl.fl4_gw  = oldflp->fl4_gw;
 277         rth->fl.mark    = oldflp->mark;
 278         rth->rt_dst     = fl->fl4_dst;
 279         rth->rt_src     = fl->fl4_src;
 280 @@ -2367,6 +2404,7 @@ static int ip_route_output_slow(struct r
 281         struct flowi fl = { .nl_u = { .ip4_u =
 282                                       { .daddr = oldflp->fl4_dst,
 283                                         .saddr = oldflp->fl4_src,
 284 +                                       .gw = oldflp->fl4_gw,
 285                                         .tos = tos & IPTOS_RT_MASK,
 286                                         .scope = ((tos & RTO_ONLINK) ?
 287                                                   RT_SCOPE_LINK :
 288 @@ -2470,6 +2508,7 @@ static int ip_route_output_slow(struct r
 289                 dev_out = &loopback_dev;
 290                 dev_hold(dev_out);
 291                 fl.oif = loopback_dev.ifindex;
 292 +               fl.fl4_gw = 0;
 293                 res.type = RTN_LOCAL;
 294                 flags |= RTCF_LOCAL;
 295                 goto make_route;
 296 @@ -2477,7 +2516,7 @@ static int ip_route_output_slow(struct r
 297
 298         if (fib_lookup(&fl, &res)) {
 299                 res.fi = NULL;
 300 -               if (oldflp->oif) {
 301 +               if (oldflp->oif && dev_out->flags & IFF_UP) {
 302                         /* Apparently, routing tables are wrong. Assume,
 303                            that the destination is on link.
 304
 305 @@ -2517,6 +2556,7 @@ static int ip_route_output_slow(struct r
 306                 dev_out = &loopback_dev;
 307                 dev_hold(dev_out);
 308                 fl.oif = dev_out->ifindex;
 309 +               fl.fl4_gw = 0;
 310                 if (res.fi)
 311                         fib_info_put(res.fi);
 312                 res.fi = NULL;
 313 @@ -2524,13 +2564,12 @@ static int ip_route_output_slow(struct r
 314                 goto make_route;
 315         }
 316
 317 +       if (res.type == RTN_UNICAST)
 318 +               fib_select_default(&fl, &res);
 319  #ifdef CONFIG_IP_ROUTE_MULTIPATH
 320 -       if (res.fi->fib_nhs > 1 && fl.oif == 0)
 321 +       if (res.fi->fib_nhs > 1)
 322                 fib_select_multipath(&fl, &res);
 323 -       else
 324  #endif
 325 -       if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif)
 326 -               fib_select_default(&fl, &res);
 327
 328         if (!fl.fl4_src)
 329                 fl.fl4_src = FIB_RES_PREFSRC(res);
 330 @@ -2567,6 +2606,7 @@ int __ip_route_output_key(struct rtable
 331                     rth->fl.fl4_src == flp->fl4_src &&
 332                     rth->fl.iif == 0 &&
 333                     rth->fl.oif == flp->oif &&
 334 +                   rth->fl.fl4_gw == flp->fl4_gw &&
 335                     rth->fl.mark == flp->mark &&
 336                     !((rth->fl.fl4_tos ^ flp->fl4_tos) &
 337                             (IPTOS_RT_MASK | RTO_ONLINK))) {
 338 @@ -3267,3 +3307,4 @@ int __init ip_rt_init(void)
 339  EXPORT_SYMBOL(__ip_select_ident);
 340  EXPORT_SYMBOL(ip_route_input);
 341  EXPORT_SYMBOL(ip_route_output_key);
 342 +EXPORT_SYMBOL(ip_route_input_lookup);