--- /dev/null
+From: Jonas Gorski <jogo@openwrt.org>
+Subject: ipv6: allow rejecting with "source address failed policy"
+
+RFC6204 L-14 requires rejecting traffic from invalid addresses with
+ICMPv6 Destination Unreachable, Code 5 (Source address failed ingress/
+egress policy) on the LAN side, so add an appropriate rule for that.
+
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ include/net/netns/ipv6.h | 1 +
+ include/uapi/linux/fib_rules.h | 4 +++
+ include/uapi/linux/rtnetlink.h | 1 +
+ net/ipv4/fib_semantics.c | 4 +++
+ net/ipv4/fib_trie.c | 1 +
+ net/ipv4/ipmr.c | 1 +
+ net/ipv6/fib6_rules.c | 4 +++
+ net/ipv6/ip6mr.c | 2 ++
+ net/ipv6/route.c | 58 +++++++++++++++++++++++++++++++++++++++++-
+ 9 files changed, 75 insertions(+), 1 deletion(-)
+
+--- a/include/net/netns/ipv6.h
++++ b/include/net/netns/ipv6.h
+@@ -66,6 +66,7 @@ struct netns_ipv6 {
+ unsigned long ip6_rt_last_gc;
+ #ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ struct rt6_info *ip6_prohibit_entry;
++ struct rt6_info *ip6_policy_failed_entry;
+ struct rt6_info *ip6_blk_hole_entry;
+ struct fib6_table *fib6_local_tbl;
+ struct fib_rules_ops *fib6_rules_ops;
+--- a/include/uapi/linux/fib_rules.h
++++ b/include/uapi/linux/fib_rules.h
+@@ -66,6 +66,10 @@ enum {
+ FR_ACT_BLACKHOLE, /* Drop without notification */
+ FR_ACT_UNREACHABLE, /* Drop with ENETUNREACH */
+ FR_ACT_PROHIBIT, /* Drop with EACCES */
++ FR_ACT_RES9,
++ FR_ACT_RES10,
++ FR_ACT_RES11,
++ FR_ACT_POLICY_FAILED, /* Drop with EACCES */
+ __FR_ACT_MAX,
+ };
+
+--- a/include/uapi/linux/rtnetlink.h
++++ b/include/uapi/linux/rtnetlink.h
+@@ -215,6 +215,7 @@ enum {
+ RTN_THROW, /* Not in this table */
+ RTN_NAT, /* Translate this address */
+ RTN_XRESOLVE, /* Use external resolver */
++ RTN_POLICY_FAILED, /* Failed ingress/egress policy */
+ __RTN_MAX
+ };
+
+--- a/net/ipv4/fib_semantics.c
++++ b/net/ipv4/fib_semantics.c
+@@ -138,6 +138,10 @@ const struct fib_prop fib_props[RTN_MAX
+ .error = -EINVAL,
+ .scope = RT_SCOPE_NOWHERE,
+ },
++ [RTN_POLICY_FAILED] = {
++ .error = -EACCES,
++ .scope = RT_SCOPE_UNIVERSE,
++ },
+ };
+
+ static void rt_fibinfo_free(struct rtable __rcu **rtp)
+--- a/net/ipv4/fib_trie.c
++++ b/net/ipv4/fib_trie.c
+@@ -2396,6 +2396,7 @@ static const char *const rtn_type_names[
+ [RTN_THROW] = "THROW",
+ [RTN_NAT] = "NAT",
+ [RTN_XRESOLVE] = "XRESOLVE",
++ [RTN_POLICY_FAILED] = "POLICY_FAILED",
+ };
+
+ static inline const char *rtn_type(char *buf, size_t len, unsigned int t)
+--- a/net/ipv4/ipmr.c
++++ b/net/ipv4/ipmr.c
+@@ -157,6 +157,7 @@ static int ipmr_rule_action(struct fib_r
+ case FR_ACT_UNREACHABLE:
+ return -ENETUNREACH;
+ case FR_ACT_PROHIBIT:
++ case FR_ACT_POLICY_FAILED:
+ return -EACCES;
+ case FR_ACT_BLACKHOLE:
+ default:
+--- a/net/ipv6/fib6_rules.c
++++ b/net/ipv6/fib6_rules.c
+@@ -88,6 +88,10 @@ static int fib6_rule_action(struct fib_r
+ err = -EACCES;
+ rt = net->ipv6.ip6_prohibit_entry;
+ goto discard_pkt;
++ case FR_ACT_POLICY_FAILED:
++ err = -EACCES;
++ rt = net->ipv6.ip6_policy_failed_entry;
++ goto discard_pkt;
+ }
+
+ tb_id = fib_rule_get_table(rule, arg);
+--- a/net/ipv6/ip6mr.c
++++ b/net/ipv6/ip6mr.c
+@@ -167,6 +167,8 @@ static int ip6mr_rule_action(struct fib_
+ return -ENETUNREACH;
+ case FR_ACT_PROHIBIT:
+ return -EACCES;
++ case FR_ACT_POLICY_FAILED:
++ return -EACCES;
+ case FR_ACT_BLACKHOLE:
+ default:
+ return -EINVAL;
+--- a/net/ipv6/route.c
++++ b/net/ipv6/route.c
+@@ -91,6 +91,8 @@ static int ip6_pkt_discard(struct sk_bu
+ static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
+ static int ip6_pkt_prohibit(struct sk_buff *skb);
+ static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
++static int ip6_pkt_policy_failed(struct sk_buff *skb);
++static int ip6_pkt_policy_failed_out(struct net *net, struct sock *sk, struct sk_buff *skb);
+ static void ip6_link_failure(struct sk_buff *skb);
+ static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb, u32 mtu);
+@@ -300,6 +302,21 @@ static const struct rt6_info ip6_prohibi
+ .rt6i_ref = ATOMIC_INIT(1),
+ };
+
++static const struct rt6_info ip6_policy_failed_entry_template = {
++ .dst = {
++ .__refcnt = ATOMIC_INIT(1),
++ .__use = 1,
++ .obsolete = DST_OBSOLETE_FORCE_CHK,
++ .error = -EACCES,
++ .input = ip6_pkt_policy_failed,
++ .output = ip6_pkt_policy_failed_out,
++ },
++ .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
++ .rt6i_protocol = RTPROT_KERNEL,
++ .rt6i_metric = ~(u32) 0,
++ .rt6i_ref = ATOMIC_INIT(1),
++};
++
+ static const struct rt6_info ip6_blk_hole_entry_template = {
+ .dst = {
+ .__refcnt = ATOMIC_INIT(1),
+@@ -1957,6 +1974,11 @@ static struct rt6_info *ip6_route_info_c
+ rt->dst.output = ip6_pkt_prohibit_out;
+ rt->dst.input = ip6_pkt_prohibit;
+ break;
++ case RTN_POLICY_FAILED:
++ rt->dst.error = -EACCES;
++ rt->dst.output = ip6_pkt_policy_failed_out;
++ rt->dst.input = ip6_pkt_policy_failed;
++ break;
+ case RTN_THROW:
+ case RTN_UNREACHABLE:
+ default:
+@@ -2600,6 +2622,17 @@ static int ip6_pkt_prohibit_out(struct n
+ return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
+ }
+
++static int ip6_pkt_policy_failed(struct sk_buff *skb)
++{
++ return ip6_pkt_drop(skb, ICMPV6_POLICY_FAIL, IPSTATS_MIB_INNOROUTES);
++}
++
++static int ip6_pkt_policy_failed_out(struct net *net, struct sock *sk, struct sk_buff *skb)
++{
++ skb->dev = skb_dst(skb)->dev;
++ return ip6_pkt_drop(skb, ICMPV6_POLICY_FAIL, IPSTATS_MIB_OUTNOROUTES);
++}
++
+ /*
+ * Allocate a dst for local (unicast / anycast) address.
+ */
+@@ -2835,7 +2868,8 @@ static int rtm_to_fib6_config(struct sk_
+ if (rtm->rtm_type == RTN_UNREACHABLE ||
+ rtm->rtm_type == RTN_BLACKHOLE ||
+ rtm->rtm_type == RTN_PROHIBIT ||
+- rtm->rtm_type == RTN_THROW)
++ rtm->rtm_type == RTN_THROW ||
++ rtm->rtm_type == RTN_POLICY_FAILED)
+ cfg->fc_flags |= RTF_REJECT;
+
+ if (rtm->rtm_type == RTN_LOCAL)
+@@ -3213,6 +3247,9 @@ static int rt6_fill_node(struct net *net
+ case -EACCES:
+ rtm->rtm_type = RTN_PROHIBIT;
+ break;
++ case -EPERM:
++ rtm->rtm_type = RTN_POLICY_FAILED;
++ break;
+ case -EAGAIN:
+ rtm->rtm_type = RTN_THROW;
+ break;
+@@ -3489,6 +3526,8 @@ static int ip6_route_dev_notify(struct n
+ #ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ net->ipv6.ip6_prohibit_entry->dst.dev = dev;
+ net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
++ net->ipv6.ip6_policy_failed_entry->dst.dev = dev;
++ net->ipv6.ip6_policy_failed_entry->rt6i_idev = in6_dev_get(dev);
+ net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
+ net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
+ #endif
+@@ -3711,6 +3750,17 @@ static int __net_init ip6_route_net_init
+ net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
+ dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
+ ip6_template_metrics, true);
++
++ net->ipv6.ip6_policy_failed_entry =
++ kmemdup(&ip6_policy_failed_entry_template,
++ sizeof(*net->ipv6.ip6_policy_failed_entry), GFP_KERNEL);
++ if (!net->ipv6.ip6_policy_failed_entry)
++ goto out_ip6_blk_hole_entry;
++ net->ipv6.ip6_policy_failed_entry->dst.path =
++ (struct dst_entry *)net->ipv6.ip6_policy_failed_entry;
++ net->ipv6.ip6_policy_failed_entry->dst.ops = &net->ipv6.ip6_dst_ops;
++ dst_init_metrics(&net->ipv6.ip6_policy_failed_entry->dst,
++ ip6_template_metrics, true);
+ #endif
+
+ net->ipv6.sysctl.flush_delay = 0;
+@@ -3729,6 +3779,8 @@ out:
+ return ret;
+
+ #ifdef CONFIG_IPV6_MULTIPLE_TABLES
++out_ip6_blk_hole_entry:
++ kfree(net->ipv6.ip6_blk_hole_entry);
+ out_ip6_prohibit_entry:
+ kfree(net->ipv6.ip6_prohibit_entry);
+ out_ip6_null_entry:
+@@ -3746,6 +3798,7 @@ static void __net_exit ip6_route_net_exi
+ #ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ kfree(net->ipv6.ip6_prohibit_entry);
+ kfree(net->ipv6.ip6_blk_hole_entry);
++ kfree(net->ipv6.ip6_policy_failed_entry);
+ #endif
+ dst_entries_destroy(&net->ipv6.ip6_dst_ops);
+ }
+@@ -3819,6 +3872,9 @@ void __init ip6_route_init_special_entri
+ init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
+ init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
+ init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
++ init_net.ipv6.ip6_policy_failed_entry->dst.dev = init_net.loopback_dev;
++ init_net.ipv6.ip6_policy_failed_entry->rt6i_idev =
++ in6_dev_get(init_net.loopback_dev);
+ #endif
+ }
+
projects / openwrt / staging / dedeckeh.git / blobdiff