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

   1 Index: linux-2.6.23-rc6/include/linux/rtnetlink.h
   2 ===================================================================
   3 --- linux-2.6.23-rc6.orig/include/linux/rtnetlink.h     2007-09-21 16:23:53.000000000 +0800
   4 +++ linux-2.6.23-rc6/include/linux/rtnetlink.h  2007-09-21 16:24:04.000000000 +0800
   5 @@ -293,6 +293,8 @@
   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-2.6.23-rc6/include/net/flow.h
  15 ===================================================================
  16 --- linux-2.6.23-rc6.orig/include/net/flow.h    2007-09-21 16:23:53.000000000 +0800
  17 +++ linux-2.6.23-rc6/include/net/flow.h 2007-09-21 16:24:04.000000000 +0800
  18 @@ -19,6 +19,8 @@
  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 @@
  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-2.6.23-rc6/net/ipv4/route.c
  37 ===================================================================
  38 --- linux-2.6.23-rc6.orig/net/ipv4/route.c      2007-09-21 16:23:53.000000000 +0800
  39 +++ linux-2.6.23-rc6/net/ipv4/route.c   2007-09-21 16:24:04.000000000 +0800
  40 @@ -1116,6 +1116,7 @@
  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 @@ -1551,6 +1552,7 @@
  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 @@ -1561,6 +1563,7 @@
  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 @@ -1624,7 +1627,7 @@
  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 @@ -1659,6 +1662,7 @@
  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 @@ -1692,6 +1696,7 @@
  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 @@ -1699,6 +1704,7 @@
  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 @@ -1720,19 +1726,21 @@
  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 @@ -1752,18 +1760,18 @@
 123   */
 124
 125  static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 126 -                              u8 tos, struct net_device *dev)
 127 +                              u8 tos, struct net_device *dev, u32 lsrc)
 128  {
 129         struct fib_result res;
 130         struct in_device *in_dev = in_dev_get(dev);
 131         struct flowi fl = { .nl_u = { .ip4_u =
 132                                       { .daddr = daddr,
 133 -                                       .saddr = saddr,
 134 +                                       .saddr = lsrc ? : saddr,
 135                                         .tos = tos,
 136                                         .scope = RT_SCOPE_UNIVERSE,
 137                                       } },
 138                             .mark = skb->mark,
 139 -                           .iif = dev->ifindex };
 140 +                           .iif = lsrc? loopback_dev.ifindex : dev->ifindex };
 141         unsigned        flags = 0;
 142         u32             itag = 0;
 143         struct rtable * rth;
 144 @@ -1796,6 +1804,12 @@
 145         if (BADCLASS(daddr) || ZERONET(daddr) || LOOPBACK(daddr))
 146                 goto martian_destination;
 147
 148 +       if (lsrc) {
 149 +               if (MULTICAST(lsrc) || BADCLASS(lsrc) ||
 150 +                   ZERONET(lsrc) || LOOPBACK(lsrc))
 151 +                       goto e_inval;
 152 +       }
 153 +
 154         /*
 155          *      Now we are ready to route packet.
 156          */
 157 @@ -1805,6 +1819,10 @@
 158                 goto no_route;
 159         }
 160         free_res = 1;
 161 +       if (lsrc && res.type != RTN_UNICAST && res.type != RTN_NAT)
 162 +               goto e_inval;
 163 +       fl.iif = dev->ifindex;
 164 +       fl.fl4_src = saddr;
 165
 166         RT_CACHE_STAT_INC(in_slow_tot);
 167
 168 @@ -1829,7 +1847,7 @@
 169         if (res.type != RTN_UNICAST)
 170                 goto martian_destination;
 171
 172 -       err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos);
 173 +       err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos, lsrc);
 174         if (err == -ENOBUFS)
 175                 goto e_nobufs;
 176         if (err == -EINVAL)
 177 @@ -1844,6 +1862,8 @@
 178  brd_input:
 179         if (skb->protocol != htons(ETH_P_IP))
 180                 goto e_inval;
 181 +       if (lsrc)
 182 +               goto e_inval;
 183
 184         if (ZERONET(saddr))
 185                 spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK);
 186 @@ -1884,6 +1904,7 @@
 187         rth->u.dst.dev  = &loopback_dev;
 188         dev_hold(rth->u.dst.dev);
 189         rth->idev       = in_dev_get(rth->u.dst.dev);
 190 +       rth->fl.fl4_gw  = 0;
 191         rth->rt_gateway = daddr;
 192         rth->rt_spec_dst= spec_dst;
 193         rth->u.dst.input= ip_local_deliver;
 194 @@ -1933,8 +1954,9 @@
 195         goto e_inval;
 196  }
 197
 198 -int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 199 -                  u8 tos, struct net_device *dev)
 200 +static inline int
 201 +ip_route_input_cached(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 202 +                  u8 tos, struct net_device *dev, u32 lsrc)
 203  {
 204         struct rtable * rth;
 205         unsigned        hash;
 206 @@ -1949,6 +1971,7 @@
 207                 if (rth->fl.fl4_dst == daddr &&
 208                     rth->fl.fl4_src == saddr &&
 209                     rth->fl.iif == iif &&
 210 +                   rth->fl.fl4_lsrc == lsrc &&
 211                     rth->fl.oif == 0 &&
 212                     rth->fl.mark == skb->mark &&
 213                     rth->fl.fl4_tos == tos) {
 214 @@ -1995,7 +2018,19 @@
 215                 rcu_read_unlock();
 216                 return -EINVAL;
 217         }
 218 -       return ip_route_input_slow(skb, daddr, saddr, tos, dev);
 219 +       return ip_route_input_slow(skb, daddr, saddr, tos, dev, lsrc);
 220 +}
 221 +
 222 +int ip_route_input(struct sk_buff *skb, u32 daddr, u32 saddr,
 223 +                  u8 tos, struct net_device *dev)
 224 +{
 225 +       return ip_route_input_cached(skb, daddr, saddr, tos, dev, 0);
 226 +}
 227 +
 228 +int ip_route_input_lookup(struct sk_buff *skb, u32 daddr, u32 saddr,
 229 +                         u8 tos, struct net_device *dev, u32 lsrc)
 230 +{
 231 +       return ip_route_input_cached(skb, daddr, saddr, tos, dev, lsrc);
 232  }
 233
 234  static inline int __mkroute_output(struct rtable **result,
 235 @@ -2067,6 +2102,7 @@
 236         rth->fl.fl4_tos = tos;
 237         rth->fl.fl4_src = oldflp->fl4_src;
 238         rth->fl.oif     = oldflp->oif;
 239 +       rth->fl.fl4_gw  = oldflp->fl4_gw;
 240         rth->fl.mark    = oldflp->mark;
 241         rth->rt_dst     = fl->fl4_dst;
 242         rth->rt_src     = fl->fl4_src;
 243 @@ -2145,6 +2181,7 @@
 244         struct flowi fl = { .nl_u = { .ip4_u =
 245                                       { .daddr = oldflp->fl4_dst,
 246                                         .saddr = oldflp->fl4_src,
 247 +                                       .gw = oldflp->fl4_gw,
 248                                         .tos = tos & IPTOS_RT_MASK,
 249                                         .scope = ((tos & RTO_ONLINK) ?
 250                                                   RT_SCOPE_LINK :
 251 @@ -2248,6 +2285,7 @@
 252                 dev_out = &loopback_dev;
 253                 dev_hold(dev_out);
 254                 fl.oif = loopback_dev.ifindex;
 255 +               fl.fl4_gw = 0;
 256                 res.type = RTN_LOCAL;
 257                 flags |= RTCF_LOCAL;
 258                 goto make_route;
 259 @@ -2255,7 +2293,7 @@
 260
 261         if (fib_lookup(&fl, &res)) {
 262                 res.fi = NULL;
 263 -               if (oldflp->oif) {
 264 +               if (oldflp->oif && dev_out->flags & IFF_UP) {
 265                         /* Apparently, routing tables are wrong. Assume,
 266                            that the destination is on link.
 267
 268 @@ -2295,6 +2333,7 @@
 269                 dev_out = &loopback_dev;
 270                 dev_hold(dev_out);
 271                 fl.oif = dev_out->ifindex;
 272 +               fl.fl4_gw = 0;
 273                 if (res.fi)
 274                         fib_info_put(res.fi);
 275                 res.fi = NULL;
 276 @@ -2302,13 +2341,12 @@
 277                 goto make_route;
 278         }
 279
 280 +       if (res.type == RTN_UNICAST)
 281 +               fib_select_default(&fl, &res);
 282  #ifdef CONFIG_IP_ROUTE_MULTIPATH
 283 -       if (res.fi->fib_nhs > 1 && fl.oif == 0)
 284 +       if (res.fi->fib_nhs > 1)
 285                 fib_select_multipath(&fl, &res);
 286 -       else
 287  #endif
 288 -       if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif)
 289 -               fib_select_default(&fl, &res);
 290
 291         if (!fl.fl4_src)
 292                 fl.fl4_src = FIB_RES_PREFSRC(res);
 293 @@ -2345,6 +2383,7 @@
 294                     rth->fl.fl4_src == flp->fl4_src &&
 295                     rth->fl.iif == 0 &&
 296                     rth->fl.oif == flp->oif &&
 297 +                   rth->fl.fl4_gw == flp->fl4_gw &&
 298                     rth->fl.mark == flp->mark &&
 299                     !((rth->fl.fl4_tos ^ flp->fl4_tos) &
 300                             (IPTOS_RT_MASK | RTO_ONLINK))) {
 301 @@ -3034,3 +3073,4 @@
 302  EXPORT_SYMBOL(__ip_select_ident);
 303  EXPORT_SYMBOL(ip_route_input);
 304  EXPORT_SYMBOL(ip_route_output_key);
 305 +EXPORT_SYMBOL(ip_route_input_lookup);