+++ /dev/null
-From 1b5aaa4b16f6e6471ab1c07b38068197a1b4c395 Mon Sep 17 00:00:00 2001
-From: Jonas Gorski <jogo@openwrt.org>
-Date: Fri, 24 May 2013 14:40:54 +0200
-Subject: [PATCH 1/2] 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
-@@ -61,6 +61,7 @@ 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
-@@ -64,6 +64,10 @@ 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
-@@ -210,6 +210,7 @@ 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
-@@ -2348,6 +2348,7 @@ 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
-@@ -182,6 +182,7 @@ 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
-@@ -73,6 +73,10 @@ 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;
- }
-
- table = fib6_get_table(net, rule->table);
---- 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
-@@ -87,6 +87,8 @@ static int ip6_pkt_discard(struct sk_bu
- static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
- static int ip6_pkt_prohibit(struct sk_buff *skb);
- static int ip6_pkt_prohibit_out(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 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);
-@@ -281,6 +283,21 @@ 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),
-@@ -1632,6 +1649,11 @@ int ip6_route_info_create(struct fib6_co
- 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:
- default:
- rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
-@@ -2223,6 +2245,17 @@ static int ip6_pkt_prohibit_out(struct s
- 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 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.
- */
-@@ -2449,7 +2482,8 @@ 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)
-@@ -2791,6 +2825,9 @@ 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;
-@@ -3048,6 +3085,8 @@ 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
-@@ -3264,6 +3303,17 @@ 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;
-@@ -3282,6 +3332,8 @@ 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:
-@@ -3299,6 +3351,7 @@ 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);
- }
-@@ -3395,6 +3448,9 @@ int __init ip6_route_init(void)
- 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
- ret = fib6_init();
- if (ret)
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