target/linux/generic/patches-3.10/670-ipv6-allow-rejecting-with-source-address-failed-policy.patch

   1 --- a/include/net/netns/ipv6.h
   2 +++ b/include/net/netns/ipv6.h
   3 @@ -55,6 +55,7 @@ struct netns_ipv6 {
   4         unsigned long            ip6_rt_last_gc;
   5  #ifdef CONFIG_IPV6_MULTIPLE_TABLES
   6         struct rt6_info         *ip6_prohibit_entry;
   7 +       struct rt6_info         *ip6_failed_policy_entry;
   8         struct rt6_info         *ip6_blk_hole_entry;
   9         struct fib6_table       *fib6_local_tbl;
  10         struct fib_rules_ops    *fib6_rules_ops;
  11 --- a/include/uapi/linux/fib_rules.h
  12 +++ b/include/uapi/linux/fib_rules.h
  13 @@ -64,6 +64,10 @@ enum {
  14         FR_ACT_BLACKHOLE,       /* Drop without notification */
  15         FR_ACT_UNREACHABLE,     /* Drop with ENETUNREACH */
  16         FR_ACT_PROHIBIT,        /* Drop with EACCES */
  17 +       FR_ACT_RES9,
  18 +       FR_ACT_RES10,
  19 +       FR_ACT_RES11,
  20 +       FR_ACT_FAILED_POLICY,   /* Drop with EPERM */
  21         __FR_ACT_MAX,
  22  };
  23
  24 --- a/include/uapi/linux/icmpv6.h
  25 +++ b/include/uapi/linux/icmpv6.h
  26 @@ -115,6 +115,7 @@ struct icmp6hdr {
  27  #define ICMPV6_NOT_NEIGHBOUR           2
  28  #define ICMPV6_ADDR_UNREACH            3
  29  #define ICMPV6_PORT_UNREACH            4
  30 +#define ICMPV6_FAILED_POLICY           5
  31
  32  /*
  33   *     Codes for Time Exceeded
  34 --- a/include/uapi/linux/rtnetlink.h
  35 +++ b/include/uapi/linux/rtnetlink.h
  36 @@ -203,6 +203,7 @@ enum {
  37         RTN_THROW,              /* Not in this table            */
  38         RTN_NAT,                /* Translate this address       */
  39         RTN_XRESOLVE,           /* Use external resolver        */
  40 +       RTN_FAILED_POLICY,      /* Failed ingress/egress policy */
  41         __RTN_MAX
  42  };
  43
  44 --- a/net/ipv4/fib_rules.c
  45 +++ b/net/ipv4/fib_rules.c
  46 @@ -84,6 +84,10 @@ static int fib4_rule_action(struct fib_r
  47                 err = -EACCES;
  48                 goto errout;
  49
  50 +       case FR_ACT_FAILED_POLICY:
  51 +               err = -EPERM;
  52 +               goto errout;
  53 +
  54         case FR_ACT_BLACKHOLE:
  55         default:
  56                 err = -EINVAL;
  57 --- a/net/ipv4/fib_semantics.c
  58 +++ b/net/ipv4/fib_semantics.c
  59 @@ -138,6 +138,10 @@ const struct fib_prop fib_props[RTN_MAX
  60                 .error  = -EINVAL,
  61                 .scope  = RT_SCOPE_NOWHERE,
  62         },
  63 +       [RTN_FAILED_POLICY] = {
  64 +               .error  = -EPERM,
  65 +               .scope  = RT_SCOPE_UNIVERSE,
  66 +       },
  67  };
  68
  69  static void rt_fibinfo_free(struct rtable __rcu **rtp)
  70 --- a/net/ipv4/fib_trie.c
  71 +++ b/net/ipv4/fib_trie.c
  72 @@ -2334,6 +2334,7 @@ static const char *const rtn_type_names[
  73         [RTN_THROW] = "THROW",
  74         [RTN_NAT] = "NAT",
  75         [RTN_XRESOLVE] = "XRESOLVE",
  76 +       [RTN_FAILED_POLICY] = "FAILED_POLICY",
  77  };
  78
  79  static inline const char *rtn_type(char *buf, size_t len, unsigned int t)
  80 --- a/net/ipv4/ipmr.c
  81 +++ b/net/ipv4/ipmr.c
  82 @@ -181,6 +181,7 @@ static int ipmr_rule_action(struct fib_r
  83         case FR_ACT_UNREACHABLE:
  84                 return -ENETUNREACH;
  85         case FR_ACT_PROHIBIT:
  86 +       case FR_ACT_FAILED_POLICY:
  87                 return -EACCES;
  88         case FR_ACT_BLACKHOLE:
  89         default:
  90 --- a/net/ipv6/fib6_rules.c
  91 +++ b/net/ipv6/fib6_rules.c
  92 @@ -69,6 +69,9 @@ static int fib6_rule_action(struct fib_r
  93         case FR_ACT_PROHIBIT:
  94                 rt = net->ipv6.ip6_prohibit_entry;
  95                 goto discard_pkt;
  96 +       case FR_ACT_FAILED_POLICY:
  97 +               rt = net->ipv6.ip6_failed_policy_entry;
  98 +               goto discard_pkt;
  99         }
 100
 101         table = fib6_get_table(net, rule->table);
 102 --- a/net/ipv6/ip6mr.c
 103 +++ b/net/ipv6/ip6mr.c
 104 @@ -166,6 +166,8 @@ static int ip6mr_rule_action(struct fib_
 105                 return -ENETUNREACH;
 106         case FR_ACT_PROHIBIT:
 107                 return -EACCES;
 108 +       case FR_ACT_FAILED_POLICY:
 109 +               return -EPERM;
 110         case FR_ACT_BLACKHOLE:
 111         default:
 112                 return -EINVAL;
 113 --- a/net/ipv6/route.c
 114 +++ b/net/ipv6/route.c
 115 @@ -245,6 +245,24 @@ static const struct rt6_info ip6_prohibi
 116         .rt6i_ref       = ATOMIC_INIT(1),
 117  };
 118
 119 +static int ip6_pkt_failed_policy(struct sk_buff *skb);
 120 +static int ip6_pkt_failed_policy_out(struct sk_buff *skb);
 121 +
 122 +static const struct rt6_info ip6_failed_policy_entry_template = {
 123 +       .dst = {
 124 +               .__refcnt       = ATOMIC_INIT(1),
 125 +               .__use          = 1,
 126 +               .obsolete       = DST_OBSOLETE_FORCE_CHK,
 127 +               .error          = -EPERM,
 128 +               .input          = ip6_pkt_failed_policy,
 129 +               .output         = ip6_pkt_failed_policy_out,
 130 +       },
 131 +       .rt6i_flags     = (RTF_REJECT | RTF_NONEXTHOP),
 132 +       .rt6i_protocol  = RTPROT_KERNEL,
 133 +       .rt6i_metric    = ~(u32) 0,
 134 +       .rt6i_ref       = ATOMIC_INIT(1),
 135 +};
 136 +
 137  static const struct rt6_info ip6_blk_hole_entry_template = {
 138         .dst = {
 139                 .__refcnt       = ATOMIC_INIT(1),
 140 @@ -1459,6 +1477,9 @@ int ip6_route_add(struct fib6_config *cf
 141                 case RTN_THROW:
 142                         rt->dst.error = -EAGAIN;
 143                         break;
 144 +               case RTN_FAILED_POLICY:
 145 +                       rt->dst.error = -EPERM;
 146 +                       break;
 147                 default:
 148                         rt->dst.error = -ENETUNREACH;
 149                         break;
 150 @@ -2035,6 +2056,17 @@ static int ip6_pkt_prohibit_out(struct s
 151         return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
 152  }
 153
 154 +static int ip6_pkt_failed_policy(struct sk_buff *skb)
 155 +{
 156 +       return ip6_pkt_drop(skb, ICMPV6_FAILED_POLICY, IPSTATS_MIB_INNOROUTES);
 157 +}
 158 +
 159 +static int ip6_pkt_failed_policy_out(struct sk_buff *skb)
 160 +{
 161 +       skb->dev = skb_dst(skb)->dev;
 162 +       return ip6_pkt_drop(skb, ICMPV6_FAILED_POLICY, IPSTATS_MIB_OUTNOROUTES);
 163 +}
 164 +
 165  #endif
 166
 167  /*
 168 @@ -2240,7 +2272,8 @@ static int rtm_to_fib6_config(struct sk_
 169         if (rtm->rtm_type == RTN_UNREACHABLE ||
 170             rtm->rtm_type == RTN_BLACKHOLE ||
 171             rtm->rtm_type == RTN_PROHIBIT ||
 172 -           rtm->rtm_type == RTN_THROW)
 173 +           rtm->rtm_type == RTN_THROW ||
 174 +           rtm->rtm_type == RTN_FAILED_POLICY)
 175                 cfg->fc_flags |= RTF_REJECT;
 176
 177         if (rtm->rtm_type == RTN_LOCAL)
 178 @@ -2442,6 +2475,9 @@ static int rt6_fill_node(struct net *net
 179                 case -EACCES:
 180                         rtm->rtm_type = RTN_PROHIBIT;
 181                         break;
 182 +               case -EPERM:
 183 +                       rtm->rtm_type = RTN_FAILED_POLICY;
 184 +                       break;
 185                 case -EAGAIN:
 186                         rtm->rtm_type = RTN_THROW;
 187                         break;
 188 @@ -2692,6 +2728,8 @@ static int ip6_route_dev_notify(struct n
 189  #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 190                 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
 191                 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
 192 +               net->ipv6.ip6_failed_policy_entry->dst.dev = dev;
 193 +               net->ipv6.ip6_failed_policy_entry->rt6i_idev = in6_dev_get(dev);
 194                 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
 195                 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
 196  #endif
 197 @@ -2952,6 +2990,17 @@ static int __net_init ip6_route_net_init
 198         net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
 199         dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
 200                          ip6_template_metrics, true);
 201 +
 202 +       net->ipv6.ip6_failed_policy_entry =
 203 +               kmemdup(&ip6_failed_policy_entry_template,
 204 +                       sizeof(*net->ipv6.ip6_failed_policy_entry), GFP_KERNEL);
 205 +       if (!net->ipv6.ip6_failed_policy_entry)
 206 +               goto out_ip6_blk_hole_entry;
 207 +       net->ipv6.ip6_failed_policy_entry->dst.path =
 208 +               (struct dst_entry *)net->ipv6.ip6_failed_policy_entry;
 209 +       net->ipv6.ip6_failed_policy_entry->dst.ops = &net->ipv6.ip6_dst_ops;
 210 +       dst_init_metrics(&net->ipv6.ip6_failed_policy_entry->dst,
 211 +                        ip6_template_metrics, true);
 212  #endif
 213
 214         net->ipv6.sysctl.flush_delay = 0;
 215 @@ -2970,6 +3019,8 @@ out:
 216         return ret;
 217
 218  #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 219 +out_ip6_blk_hole_entry:
 220 +       kfree(net->ipv6.ip6_blk_hole_entry);
 221  out_ip6_prohibit_entry:
 222         kfree(net->ipv6.ip6_prohibit_entry);
 223  out_ip6_null_entry:
 224 @@ -2987,6 +3038,7 @@ static void __net_exit ip6_route_net_exi
 225  #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 226         kfree(net->ipv6.ip6_prohibit_entry);
 227         kfree(net->ipv6.ip6_blk_hole_entry);
 228 +       kfree(net->ipv6.ip6_failed_policy_entry);
 229  #endif
 230         dst_entries_destroy(&net->ipv6.ip6_dst_ops);
 231  }
 232 @@ -3083,6 +3135,9 @@ int __init ip6_route_init(void)
 233         init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
 234         init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
 235         init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
 236 +       init_net.ipv6.ip6_failed_policy_entry->dst.dev = init_net.loopback_dev;
 237 +       init_net.ipv6.ip6_failed_policy_entry->rt6i_idev =
 238 +               in6_dev_get(init_net.loopback_dev);
 239    #endif
 240         ret = fib6_init();
 241         if (ret)