target/linux/generic-2.6/patches-2.6.23/201-multiple_default_gateways.patch

   1 --- a/include/linux/rtnetlink.h
   2 +++ b/include/linux/rtnetlink.h
   3 @@ -293,6 +293,8 @@
   4  #define RTNH_F_DEAD            1       /* Nexthop is dead (used by multipath)  */
   5  #define RTNH_F_PERVASIVE       2       /* Do recursive gateway lookup  */
   6  #define RTNH_F_ONLINK          4       /* Gateway is forced on link    */
   7 +#define RTNH_F_SUSPECT         8       /* We don't know the real state */
   8 +#define RTNH_F_BADSTATE                (RTNH_F_DEAD | RTNH_F_SUSPECT)
   9
  10  /* Macros to handle hexthops */
  11
  12 --- a/include/net/flow.h
  13 +++ b/include/net/flow.h
  14 @@ -19,6 +19,8 @@
  15                 struct {
  16                         __be32                  daddr;
  17                         __be32                  saddr;
  18 +                       __u32                   lsrc;
  19 +                       __u32                   gw;
  20                         __u8                    tos;
  21                         __u8                    scope;
  22                 } ip4_u;
  23 @@ -43,6 +45,8 @@
  24  #define fl6_flowlabel  nl_u.ip6_u.flowlabel
  25  #define fl4_dst                nl_u.ip4_u.daddr
  26  #define fl4_src                nl_u.ip4_u.saddr
  27 +#define fl4_lsrc        nl_u.ip4_u.lsrc
  28 +#define fl4_gw         nl_u.ip4_u.gw
  29  #define fl4_tos                nl_u.ip4_u.tos
  30  #define fl4_scope      nl_u.ip4_u.scope
  31
  32 --- a/net/ipv4/route.c
  33 +++ b/net/ipv4/route.c
  34 @@ -1116,6 +1116,7 @@
  35
  36                                 /* Gateway is different ... */
  37                                 rt->rt_gateway          = new_gw;
  38 +                               if (rt->fl.fl4_gw) rt->fl.fl4_gw = new_gw;
  39
  40                                 /* Redirect received -> path was valid */
  41                                 dst_confirm(&rth->u.dst);
  42 @@ -1551,6 +1552,7 @@
  43         rth->fl.fl4_tos = tos;
  44         rth->fl.mark    = skb->mark;
  45         rth->fl.fl4_src = saddr;
  46 +       rth->fl.fl4_lsrc = 0;
  47         rth->rt_src     = saddr;
  48  #ifdef CONFIG_NET_CLS_ROUTE
  49         rth->u.dst.tclassid = itag;
  50 @@ -1561,6 +1563,7 @@
  51         dev_hold(rth->u.dst.dev);
  52         rth->idev       = in_dev_get(rth->u.dst.dev);
  53         rth->fl.oif     = 0;
  54 +       rth->fl.fl4_gw  = 0;
  55         rth->rt_gateway = daddr;
  56         rth->rt_spec_dst= spec_dst;
  57         rth->rt_type    = RTN_MULTICAST;
  58 @@ -1624,7 +1627,7 @@
  59  static inline int __mkroute_input(struct sk_buff *skb,
  60                                   struct fib_result* res,
  61                                   struct in_device *in_dev,
  62 -                                 __be32 daddr, __be32 saddr, u32 tos,
  63 +                                 __be32 daddr, __be32 saddr, u32 tos, u32 lsrc,
  64                                   struct rtable **result)
  65  {
  66
  67 @@ -1659,6 +1662,7 @@
  68                 flags |= RTCF_DIRECTSRC;
  69
  70         if (out_dev == in_dev && err && !(flags & (RTCF_NAT | RTCF_MASQ)) &&
  71 +           !lsrc &&
  72             (IN_DEV_SHARED_MEDIA(out_dev) ||
  73              inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res))))
  74                 flags |= RTCF_DOREDIRECT;
  75 @@ -1692,6 +1696,7 @@
  76         rth->fl.mark    = skb->mark;
  77         rth->fl.fl4_src = saddr;
  78         rth->rt_src     = saddr;
  79 +       rth->fl.fl4_lsrc        = lsrc;
  80         rth->rt_gateway = daddr;
  81         rth->rt_iif     =
  82                 rth->fl.iif     = in_dev->dev->ifindex;
  83 @@ -1699,6 +1704,7 @@
  84         dev_hold(rth->u.dst.dev);
  85         rth->idev       = in_dev_get(rth->u.dst.dev);
  86         rth->fl.oif     = 0;
  87 +       rth->fl.fl4_gw  = 0;
  88         rth->rt_spec_dst= spec_dst;
  89
  90         rth->u.dst.input = ip_forward;
  91 @@ -1720,19 +1726,21 @@
  92                                    struct fib_result* res,
  93                                    const struct flowi *fl,
  94                                    struct in_device *in_dev,
  95 -                                  __be32 daddr, __be32 saddr, u32 tos)
  96 +                                  __be32 daddr, __be32 saddr, u32 tos,
  97 +                                  u32 lsrc)
  98  {
  99         struct rtable* rth = NULL;
 100         int err;
 101         unsigned hash;
 102
 103 +       fib_select_default(fl, res);
 104  #ifdef CONFIG_IP_ROUTE_MULTIPATH
 105 -       if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0)
 106 +       if (res->fi && res->fi->fib_nhs > 1)
 107                 fib_select_multipath(fl, res);
 108  #endif
 109
 110         /* create a routing cache entry */
 111 -       err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth);
 112 +       err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, lsrc, &rth);
 113         if (err)
 114                 return err;
 115
 116 @@ -1752,18 +1760,18 @@
 117   */
 118
 119  static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 120 -                              u8 tos, struct net_device *dev)
 121 +                              u8 tos, struct net_device *dev, u32 lsrc)
 122  {
 123         struct fib_result res;
 124         struct in_device *in_dev = in_dev_get(dev);
 125         struct flowi fl = { .nl_u = { .ip4_u =
 126                                       { .daddr = daddr,
 127 -                                       .saddr = saddr,
 128 +                                       .saddr = lsrc ? : saddr,
 129                                         .tos = tos,
 130                                         .scope = RT_SCOPE_UNIVERSE,
 131                                       } },
 132                             .mark = skb->mark,
 133 -                           .iif = dev->ifindex };
 134 +                           .iif = lsrc? loopback_dev.ifindex : dev->ifindex };
 135         unsigned        flags = 0;
 136         u32             itag = 0;
 137         struct rtable * rth;
 138 @@ -1796,6 +1804,12 @@
 139         if (BADCLASS(daddr) || ZERONET(daddr) || LOOPBACK(daddr))
 140                 goto martian_destination;
 141
 142 +       if (lsrc) {
 143 +               if (MULTICAST(lsrc) || BADCLASS(lsrc) ||
 144 +                   ZERONET(lsrc) || LOOPBACK(lsrc))
 145 +                       goto e_inval;
 146 +       }
 147 +
 148         /*
 149          *      Now we are ready to route packet.
 150          */
 151 @@ -1805,6 +1819,10 @@
 152                 goto no_route;
 153         }
 154         free_res = 1;
 155 +       if (lsrc && res.type != RTN_UNICAST && res.type != RTN_NAT)
 156 +               goto e_inval;
 157 +       fl.iif = dev->ifindex;
 158 +       fl.fl4_src = saddr;
 159
 160         RT_CACHE_STAT_INC(in_slow_tot);
 161
 162 @@ -1829,7 +1847,7 @@
 163         if (res.type != RTN_UNICAST)
 164                 goto martian_destination;
 165
 166 -       err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos);
 167 +       err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos, lsrc);
 168         if (err == -ENOBUFS)
 169                 goto e_nobufs;
 170         if (err == -EINVAL)
 171 @@ -1844,6 +1862,8 @@
 172  brd_input:
 173         if (skb->protocol != htons(ETH_P_IP))
 174                 goto e_inval;
 175 +       if (lsrc)
 176 +               goto e_inval;
 177
 178         if (ZERONET(saddr))
 179                 spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK);
 180 @@ -1884,6 +1904,7 @@
 181         rth->u.dst.dev  = &loopback_dev;
 182         dev_hold(rth->u.dst.dev);
 183         rth->idev       = in_dev_get(rth->u.dst.dev);
 184 +       rth->fl.fl4_gw  = 0;
 185         rth->rt_gateway = daddr;
 186         rth->rt_spec_dst= spec_dst;
 187         rth->u.dst.input= ip_local_deliver;
 188 @@ -1933,8 +1954,9 @@
 189         goto e_inval;
 190  }
 191
 192 -int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 193 -                  u8 tos, struct net_device *dev)
 194 +static inline int
 195 +ip_route_input_cached(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 196 +                  u8 tos, struct net_device *dev, u32 lsrc)
 197  {
 198         struct rtable * rth;
 199         unsigned        hash;
 200 @@ -1949,6 +1971,7 @@
 201                 if (rth->fl.fl4_dst == daddr &&
 202                     rth->fl.fl4_src == saddr &&
 203                     rth->fl.iif == iif &&
 204 +                   rth->fl.fl4_lsrc == lsrc &&
 205                     rth->fl.oif == 0 &&
 206                     rth->fl.mark == skb->mark &&
 207                     rth->fl.fl4_tos == tos) {
 208 @@ -1995,7 +2018,19 @@
 209                 rcu_read_unlock();
 210                 return -EINVAL;
 211         }
 212 -       return ip_route_input_slow(skb, daddr, saddr, tos, dev);
 213 +       return ip_route_input_slow(skb, daddr, saddr, tos, dev, lsrc);
 214 +}
 215 +
 216 +int ip_route_input(struct sk_buff *skb, u32 daddr, u32 saddr,
 217 +                  u8 tos, struct net_device *dev)
 218 +{
 219 +       return ip_route_input_cached(skb, daddr, saddr, tos, dev, 0);
 220 +}
 221 +
 222 +int ip_route_input_lookup(struct sk_buff *skb, u32 daddr, u32 saddr,
 223 +                         u8 tos, struct net_device *dev, u32 lsrc)
 224 +{
 225 +       return ip_route_input_cached(skb, daddr, saddr, tos, dev, lsrc);
 226  }
 227
 228  static inline int __mkroute_output(struct rtable **result,
 229 @@ -2067,6 +2102,7 @@
 230         rth->fl.fl4_tos = tos;
 231         rth->fl.fl4_src = oldflp->fl4_src;
 232         rth->fl.oif     = oldflp->oif;
 233 +       rth->fl.fl4_gw  = oldflp->fl4_gw;
 234         rth->fl.mark    = oldflp->mark;
 235         rth->rt_dst     = fl->fl4_dst;
 236         rth->rt_src     = fl->fl4_src;
 237 @@ -2145,6 +2181,7 @@
 238         struct flowi fl = { .nl_u = { .ip4_u =
 239                                       { .daddr = oldflp->fl4_dst,
 240                                         .saddr = oldflp->fl4_src,
 241 +                                       .gw = oldflp->fl4_gw,
 242                                         .tos = tos & IPTOS_RT_MASK,
 243                                         .scope = ((tos & RTO_ONLINK) ?
 244                                                   RT_SCOPE_LINK :
 245 @@ -2248,6 +2285,7 @@
 246                 dev_out = &loopback_dev;
 247                 dev_hold(dev_out);
 248                 fl.oif = loopback_dev.ifindex;
 249 +               fl.fl4_gw = 0;
 250                 res.type = RTN_LOCAL;
 251                 flags |= RTCF_LOCAL;
 252                 goto make_route;
 253 @@ -2255,7 +2293,7 @@
 254
 255         if (fib_lookup(&fl, &res)) {
 256                 res.fi = NULL;
 257 -               if (oldflp->oif) {
 258 +               if (oldflp->oif && dev_out->flags & IFF_UP) {
 259                         /* Apparently, routing tables are wrong. Assume,
 260                            that the destination is on link.
 261
 262 @@ -2295,6 +2333,7 @@
 263                 dev_out = &loopback_dev;
 264                 dev_hold(dev_out);
 265                 fl.oif = dev_out->ifindex;
 266 +               fl.fl4_gw = 0;
 267                 if (res.fi)
 268                         fib_info_put(res.fi);
 269                 res.fi = NULL;
 270 @@ -2302,13 +2341,12 @@
 271                 goto make_route;
 272         }
 273
 274 +       if (res.type == RTN_UNICAST)
 275 +               fib_select_default(&fl, &res);
 276  #ifdef CONFIG_IP_ROUTE_MULTIPATH
 277 -       if (res.fi->fib_nhs > 1 && fl.oif == 0)
 278 +       if (res.fi->fib_nhs > 1)
 279                 fib_select_multipath(&fl, &res);
 280 -       else
 281  #endif
 282 -       if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif)
 283 -               fib_select_default(&fl, &res);
 284
 285         if (!fl.fl4_src)
 286                 fl.fl4_src = FIB_RES_PREFSRC(res);
 287 @@ -2345,6 +2383,7 @@
 288                     rth->fl.fl4_src == flp->fl4_src &&
 289                     rth->fl.iif == 0 &&
 290                     rth->fl.oif == flp->oif &&
 291 +                   rth->fl.fl4_gw == flp->fl4_gw &&
 292                     rth->fl.mark == flp->mark &&
 293                     !((rth->fl.fl4_tos ^ flp->fl4_tos) &
 294                             (IPTOS_RT_MASK | RTO_ONLINK))) {
 295 @@ -3030,3 +3069,4 @@
 296  EXPORT_SYMBOL(__ip_select_ident);
 297  EXPORT_SYMBOL(ip_route_input);
 298  EXPORT_SYMBOL(ip_route_output_key);
 299 +EXPORT_SYMBOL(ip_route_input_lookup);