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@ -1,10 +1,32 @@
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From 1b5aaa4b16f6e6471ab1c07b38068197a1b4c395 Mon Sep 17 00:00:00 2001
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From: Jonas Gorski <jogo@openwrt.org>
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Date: Fri, 24 May 2013 14:40:54 +0200
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Subject: [PATCH 1/2] ipv6: allow rejecting with "source address failed policy"
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RFC6204 L-14 requires rejecting traffic from invalid addresses with
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ICMPv6 Destination Unreachable, Code 5 (Source address failed ingress/
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egress policy) on the LAN side, so add an appropriate rule for that.
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Signed-off-by: Jonas Gorski <jogo@openwrt.org>
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---
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include/net/netns/ipv6.h | 1 +
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include/uapi/linux/fib_rules.h | 4 +++
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include/uapi/linux/rtnetlink.h | 1 +
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net/ipv4/fib_semantics.c | 4 +++
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net/ipv4/fib_trie.c | 1 +
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net/ipv4/ipmr.c | 1 +
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net/ipv6/fib6_rules.c | 4 +++
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net/ipv6/ip6mr.c | 2 ++
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net/ipv6/route.c | 58 +++++++++++++++++++++++++++++++++++++++++-
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9 files changed, 75 insertions(+), 1 deletion(-)
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--- a/include/net/netns/ipv6.h
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+++ b/include/net/netns/ipv6.h
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@@ -55,6 +55,7 @@ struct netns_ipv6 {
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unsigned long ip6_rt_last_gc;
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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struct rt6_info *ip6_prohibit_entry;
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+ struct rt6_info *ip6_failed_policy_entry;
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+ struct rt6_info *ip6_policy_failed_entry;
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struct rt6_info *ip6_blk_hole_entry;
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struct fib6_table *fib6_local_tbl;
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struct fib_rules_ops *fib6_rules_ops;
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@ -17,7 +39,7 @@
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+ FR_ACT_RES9,
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+ FR_ACT_RES10,
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+ FR_ACT_RES11,
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+ FR_ACT_FAILED_POLICY, /* Drop with EPERM */
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+ FR_ACT_POLICY_FAILED, /* Drop with EACCES */
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__FR_ACT_MAX,
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};
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@ -27,31 +49,18 @@
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RTN_THROW, /* Not in this table */
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RTN_NAT, /* Translate this address */
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RTN_XRESOLVE, /* Use external resolver */
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+ RTN_FAILED_POLICY, /* Failed ingress/egress policy */
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+ RTN_POLICY_FAILED, /* Failed ingress/egress policy */
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__RTN_MAX
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};
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--- a/net/ipv4/fib_rules.c
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+++ b/net/ipv4/fib_rules.c
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@@ -84,6 +84,10 @@ static int fib4_rule_action(struct fib_r
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err = -EACCES;
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goto errout;
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+ case FR_ACT_FAILED_POLICY:
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+ err = -EPERM;
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+ goto errout;
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+
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case FR_ACT_BLACKHOLE:
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default:
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err = -EINVAL;
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--- a/net/ipv4/fib_semantics.c
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+++ b/net/ipv4/fib_semantics.c
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@@ -138,6 +138,10 @@ const struct fib_prop fib_props[RTN_MAX
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.error = -EINVAL,
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.scope = RT_SCOPE_NOWHERE,
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},
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+ [RTN_FAILED_POLICY] = {
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+ .error = -EPERM,
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+ [RTN_POLICY_FAILED] = {
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+ .error = -EACCES,
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+ .scope = RT_SCOPE_UNIVERSE,
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+ },
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};
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@ -63,60 +72,67 @@
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[RTN_THROW] = "THROW",
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[RTN_NAT] = "NAT",
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[RTN_XRESOLVE] = "XRESOLVE",
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+ [RTN_FAILED_POLICY] = "FAILED_POLICY",
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+ [RTN_POLICY_FAILED] = "POLICY_FAILED",
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};
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static inline const char *rtn_type(char *buf, size_t len, unsigned int t)
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--- a/net/ipv4/ipmr.c
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+++ b/net/ipv4/ipmr.c
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@@ -181,6 +181,7 @@ static int ipmr_rule_action(struct fib_r
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@@ -184,6 +184,7 @@ static int ipmr_rule_action(struct fib_r
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case FR_ACT_UNREACHABLE:
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return -ENETUNREACH;
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case FR_ACT_PROHIBIT:
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+ case FR_ACT_FAILED_POLICY:
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+ case FR_ACT_POLICY_FAILED:
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return -EACCES;
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case FR_ACT_BLACKHOLE:
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default:
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--- a/net/ipv6/fib6_rules.c
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+++ b/net/ipv6/fib6_rules.c
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@@ -73,6 +73,9 @@ static int fib6_rule_action(struct fib_r
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@@ -73,6 +73,10 @@ static int fib6_rule_action(struct fib_r
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err = -EACCES;
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rt = net->ipv6.ip6_prohibit_entry;
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goto discard_pkt;
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+ case FR_ACT_FAILED_POLICY:
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+ rt = net->ipv6.ip6_failed_policy_entry;
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+ case FR_ACT_POLICY_FAILED:
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+ err = -EACCES;
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+ rt = net->ipv6.ip6_policy_failed_entry;
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+ goto discard_pkt;
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}
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table = fib6_get_table(net, rule->table);
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--- a/net/ipv6/ip6mr.c
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+++ b/net/ipv6/ip6mr.c
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@@ -166,6 +166,8 @@ static int ip6mr_rule_action(struct fib_
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@@ -169,6 +169,8 @@ static int ip6mr_rule_action(struct fib_
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return -ENETUNREACH;
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case FR_ACT_PROHIBIT:
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return -EACCES;
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+ case FR_ACT_FAILED_POLICY:
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+ return -EPERM;
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+ case FR_ACT_POLICY_FAILED:
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+ return -EACCES;
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case FR_ACT_BLACKHOLE:
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default:
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return -EINVAL;
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--- a/net/ipv6/route.c
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+++ b/net/ipv6/route.c
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@@ -252,6 +252,24 @@ static const struct rt6_info ip6_prohibi
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@@ -86,6 +86,8 @@ static int ip6_pkt_discard(struct sk_bu
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static int ip6_pkt_discard_out(struct sk_buff *skb);
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static int ip6_pkt_prohibit(struct sk_buff *skb);
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static int ip6_pkt_prohibit_out(struct sk_buff *skb);
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+static int ip6_pkt_policy_failed(struct sk_buff *skb);
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+static int ip6_pkt_policy_failed_out(struct sk_buff *skb);
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static void ip6_link_failure(struct sk_buff *skb);
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static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
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struct sk_buff *skb, u32 mtu);
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@@ -251,6 +253,21 @@ static const struct rt6_info ip6_prohibi
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.rt6i_ref = ATOMIC_INIT(1),
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};
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+static int ip6_pkt_failed_policy(struct sk_buff *skb);
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+static int ip6_pkt_failed_policy_out(struct sk_buff *skb);
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+
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+static const struct rt6_info ip6_failed_policy_entry_template = {
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+static const struct rt6_info ip6_policy_failed_entry_template = {
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+ .dst = {
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+ .__refcnt = ATOMIC_INIT(1),
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+ .__use = 1,
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+ .obsolete = DST_OBSOLETE_FORCE_CHK,
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+ .error = -EPERM,
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+ .input = ip6_pkt_failed_policy,
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+ .output = ip6_pkt_failed_policy_out,
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+ .error = -EACCES,
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+ .input = ip6_pkt_policy_failed,
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+ .output = ip6_pkt_policy_failed_out,
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+ },
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+ .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
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+ .rt6i_protocol = RTPROT_KERNEL,
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@ -127,82 +143,84 @@
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static const struct rt6_info ip6_blk_hole_entry_template = {
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.dst = {
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.__refcnt = ATOMIC_INIT(1),
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@@ -1583,6 +1601,9 @@ int ip6_route_add(struct fib6_config *cf
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case RTN_THROW:
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rt->dst.error = -EAGAIN;
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@@ -1581,6 +1598,11 @@ int ip6_route_add(struct fib6_config *cf
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rt->dst.output = ip6_pkt_prohibit_out;
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rt->dst.input = ip6_pkt_prohibit;
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break;
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+ case RTN_FAILED_POLICY:
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+ rt->dst.error = -EPERM;
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+ case RTN_POLICY_FAILED:
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+ rt->dst.error = -EACCES;
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+ rt->dst.output = ip6_pkt_policy_failed_out;
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+ rt->dst.input = ip6_pkt_policy_failed;
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+ break;
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case RTN_THROW:
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default:
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rt->dst.error = -ENETUNREACH;
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break;
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@@ -2162,6 +2183,17 @@ static int ip6_pkt_prohibit_out(struct s
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rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
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@@ -2160,6 +2182,17 @@ static int ip6_pkt_prohibit_out(struct s
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return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
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}
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+static int ip6_pkt_failed_policy(struct sk_buff *skb)
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+static int ip6_pkt_policy_failed(struct sk_buff *skb)
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+{
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+ return ip6_pkt_drop(skb, ICMPV6_POLICY_FAIL, IPSTATS_MIB_INNOROUTES);
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+}
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+
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+static int ip6_pkt_failed_policy_out(struct sk_buff *skb)
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+static int ip6_pkt_policy_failed_out(struct sk_buff *skb)
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+{
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+ skb->dev = skb_dst(skb)->dev;
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+ return ip6_pkt_drop(skb, ICMPV6_POLICY_FAIL, IPSTATS_MIB_OUTNOROUTES);
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+}
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+
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#endif
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/*
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@@ -2368,7 +2400,8 @@ static int rtm_to_fib6_config(struct sk_
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* Allocate a dst for local (unicast / anycast) address.
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*/
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@@ -2362,7 +2395,8 @@ static int rtm_to_fib6_config(struct sk_
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if (rtm->rtm_type == RTN_UNREACHABLE ||
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rtm->rtm_type == RTN_BLACKHOLE ||
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rtm->rtm_type == RTN_PROHIBIT ||
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- rtm->rtm_type == RTN_THROW)
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+ rtm->rtm_type == RTN_THROW ||
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+ rtm->rtm_type == RTN_FAILED_POLICY)
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+ rtm->rtm_type == RTN_POLICY_FAILED)
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cfg->fc_flags |= RTF_REJECT;
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if (rtm->rtm_type == RTN_LOCAL)
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@@ -2570,6 +2603,9 @@ static int rt6_fill_node(struct net *net
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@@ -2564,6 +2598,9 @@ static int rt6_fill_node(struct net *net
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case -EACCES:
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rtm->rtm_type = RTN_PROHIBIT;
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break;
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+ case -EPERM:
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+ rtm->rtm_type = RTN_FAILED_POLICY;
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+ rtm->rtm_type = RTN_POLICY_FAILED;
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+ break;
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case -EAGAIN:
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rtm->rtm_type = RTN_THROW;
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break;
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@@ -2820,6 +2856,8 @@ static int ip6_route_dev_notify(struct n
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@@ -2814,6 +2851,8 @@ static int ip6_route_dev_notify(struct n
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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net->ipv6.ip6_prohibit_entry->dst.dev = dev;
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net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
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+ net->ipv6.ip6_failed_policy_entry->dst.dev = dev;
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+ net->ipv6.ip6_failed_policy_entry->rt6i_idev = in6_dev_get(dev);
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+ net->ipv6.ip6_policy_failed_entry->dst.dev = dev;
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+ net->ipv6.ip6_policy_failed_entry->rt6i_idev = in6_dev_get(dev);
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net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
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net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
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#endif
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@@ -3080,6 +3118,17 @@ static int __net_init ip6_route_net_init
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@@ -3074,6 +3113,17 @@ static int __net_init ip6_route_net_init
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net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
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dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
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ip6_template_metrics, true);
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+
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+ net->ipv6.ip6_failed_policy_entry =
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+ kmemdup(&ip6_failed_policy_entry_template,
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+ sizeof(*net->ipv6.ip6_failed_policy_entry), GFP_KERNEL);
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+ if (!net->ipv6.ip6_failed_policy_entry)
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+ net->ipv6.ip6_policy_failed_entry =
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+ kmemdup(&ip6_policy_failed_entry_template,
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+ sizeof(*net->ipv6.ip6_policy_failed_entry), GFP_KERNEL);
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+ if (!net->ipv6.ip6_policy_failed_entry)
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+ goto out_ip6_blk_hole_entry;
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+ net->ipv6.ip6_failed_policy_entry->dst.path =
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+ (struct dst_entry *)net->ipv6.ip6_failed_policy_entry;
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+ net->ipv6.ip6_failed_policy_entry->dst.ops = &net->ipv6.ip6_dst_ops;
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+ dst_init_metrics(&net->ipv6.ip6_failed_policy_entry->dst,
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+ net->ipv6.ip6_policy_failed_entry->dst.path =
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+ (struct dst_entry *)net->ipv6.ip6_policy_failed_entry;
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+ net->ipv6.ip6_policy_failed_entry->dst.ops = &net->ipv6.ip6_dst_ops;
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+ dst_init_metrics(&net->ipv6.ip6_policy_failed_entry->dst,
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+ ip6_template_metrics, true);
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#endif
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net->ipv6.sysctl.flush_delay = 0;
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@@ -3098,6 +3147,8 @@ out:
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@@ -3092,6 +3142,8 @@ out:
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return ret;
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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@ -211,20 +229,20 @@
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out_ip6_prohibit_entry:
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kfree(net->ipv6.ip6_prohibit_entry);
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out_ip6_null_entry:
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@@ -3115,6 +3166,7 @@ static void __net_exit ip6_route_net_exi
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@@ -3109,6 +3161,7 @@ static void __net_exit ip6_route_net_exi
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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kfree(net->ipv6.ip6_prohibit_entry);
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kfree(net->ipv6.ip6_blk_hole_entry);
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+ kfree(net->ipv6.ip6_failed_policy_entry);
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+ kfree(net->ipv6.ip6_policy_failed_entry);
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#endif
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dst_entries_destroy(&net->ipv6.ip6_dst_ops);
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}
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@@ -3211,6 +3263,9 @@ int __init ip6_route_init(void)
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@@ -3205,6 +3258,9 @@ int __init ip6_route_init(void)
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init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
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init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
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init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
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+ init_net.ipv6.ip6_failed_policy_entry->dst.dev = init_net.loopback_dev;
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+ init_net.ipv6.ip6_failed_policy_entry->rt6i_idev =
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+ init_net.ipv6.ip6_policy_failed_entry->dst.dev = init_net.loopback_dev;
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+ init_net.ipv6.ip6_policy_failed_entry->rt6i_idev =
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+ in6_dev_get(init_net.loopback_dev);
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|
#endif
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|
ret = fib6_init();
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Imre Kaloz
10 years ago