diff options
Diffstat (limited to 'nixos/modules/kernel-patches/0068-ipv6-allow-rejecting-with-source-address-failed-poli.patch')
| -rw-r--r-- | nixos/modules/kernel-patches/0068-ipv6-allow-rejecting-with-source-address-failed-poli.patch | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/nixos/modules/kernel-patches/0068-ipv6-allow-rejecting-with-source-address-failed-poli.patch b/nixos/modules/kernel-patches/0068-ipv6-allow-rejecting-with-source-address-failed-poli.patch new file mode 100644 index 0000000..a05d094 --- /dev/null +++ b/nixos/modules/kernel-patches/0068-ipv6-allow-rejecting-with-source-address-failed-poli.patch @@ -0,0 +1,287 @@ +From 24dbd611c9221c07bd1e7f24b472171e2a34f68b Mon Sep 17 00:00:00 2001 +From: Jonas Gorski <jogo@openwrt.org> +Date: Tue, 27 Sep 2022 16:22:06 +0200 +Subject: [PATCH 68/96] 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 | 56 ++++++++++++++++++++++++++++++++-- + 9 files changed, 72 insertions(+), 2 deletions(-) + +diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h +index b4af4837d80b..094872c7df4a 100644 +--- a/include/net/netns/ipv6.h ++++ b/include/net/netns/ipv6.h +@@ -85,6 +85,7 @@ struct netns_ipv6 { + unsigned int fib6_routes_require_src; + #endif + 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; +diff --git a/include/uapi/linux/fib_rules.h b/include/uapi/linux/fib_rules.h +index 232df14e1287..fdc18621ab75 100644 +--- a/include/uapi/linux/fib_rules.h ++++ b/include/uapi/linux/fib_rules.h +@@ -82,6 +82,10 @@ 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, + }; + +diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h +index 83849a37db5b..b8e58371c0ef 100644 +--- a/include/uapi/linux/rtnetlink.h ++++ b/include/uapi/linux/rtnetlink.h +@@ -265,6 +265,7 @@ 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 + }; + +diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c +index db7b2503f068..dfeb22580309 100644 +--- a/net/ipv4/fib_semantics.c ++++ b/net/ipv4/fib_semantics.c +@@ -144,6 +144,10 @@ const struct fib_prop fib_props[RTN_MAX + 1] = { + .error = -EINVAL, + .scope = RT_SCOPE_NOWHERE, + }, ++ [RTN_POLICY_FAILED] = { ++ .error = -EACCES, ++ .scope = RT_SCOPE_UNIVERSE, ++ }, + }; + + static void rt_fibinfo_free(struct rtable __rcu **rtp) +diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c +index 452ff177e4da..833514126e1a 100644 +--- a/net/ipv4/fib_trie.c ++++ b/net/ipv4/fib_trie.c +@@ -2776,6 +2776,7 @@ static const char *const rtn_type_names[__RTN_MAX] = { + [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) +diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c +index 13e6329784fb..31ab9eca976b 100644 +--- a/net/ipv4/ipmr.c ++++ b/net/ipv4/ipmr.c +@@ -175,6 +175,7 @@ static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, + case FR_ACT_UNREACHABLE: + return -ENETUNREACH; + case FR_ACT_PROHIBIT: ++ case FR_ACT_POLICY_FAILED: + return -EACCES; + case FR_ACT_BLACKHOLE: + default: +diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c +index 7c2003833010..4679e25843d6 100644 +--- a/net/ipv6/fib6_rules.c ++++ b/net/ipv6/fib6_rules.c +@@ -221,6 +221,10 @@ static int __fib6_rule_action(struct fib_rule *rule, struct flowi *flp, + 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); +diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c +index 4e74bc61a3db..b51a175e35b0 100644 +--- a/net/ipv6/ip6mr.c ++++ b/net/ipv6/ip6mr.c +@@ -163,6 +163,8 @@ static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp, + return -ENETUNREACH; + case FR_ACT_PROHIBIT: + return -EACCES; ++ case FR_ACT_POLICY_FAILED: ++ return -EACCES; + case FR_ACT_BLACKHOLE: + default: + return -EINVAL; +diff --git a/net/ipv6/route.c b/net/ipv6/route.c +index 916417944ec8..43bc02822169 100644 +--- a/net/ipv6/route.c ++++ b/net/ipv6/route.c +@@ -97,6 +97,8 @@ static int ip6_pkt_discard(struct sk_buff *skb); + 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, +@@ -317,6 +319,18 @@ static const struct rt6_info ip6_prohibit_entry_template = { + .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), + }; + ++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), ++}; ++ + static const struct rt6_info ip6_blk_hole_entry_template = { + .dst = { + .__refcnt = ATOMIC_INIT(1), +@@ -1036,6 +1050,7 @@ static const int fib6_prop[RTN_MAX + 1] = { + [RTN_BLACKHOLE] = -EINVAL, + [RTN_UNREACHABLE] = -EHOSTUNREACH, + [RTN_PROHIBIT] = -EACCES, ++ [RTN_POLICY_FAILED] = -EACCES, + [RTN_THROW] = -EAGAIN, + [RTN_NAT] = -EINVAL, + [RTN_XRESOLVE] = -EINVAL, +@@ -1071,6 +1086,10 @@ static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type) + rt->dst.output = ip6_pkt_prohibit_out; + rt->dst.input = ip6_pkt_prohibit; + break; ++ case RTN_POLICY_FAILED: ++ rt->dst.output = ip6_pkt_policy_failed_out; ++ rt->dst.input = ip6_pkt_policy_failed; ++ break; + case RTN_THROW: + case RTN_UNREACHABLE: + default: +@@ -4539,6 +4558,17 @@ static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff + 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. + */ +@@ -5032,7 +5062,8 @@ static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, + 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) +@@ -6285,6 +6316,8 @@ static int ip6_route_dev_notify(struct notifier_block *this, + #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 +@@ -6296,6 +6329,7 @@ static int ip6_route_dev_notify(struct notifier_block *this, + in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev); + #ifdef CONFIG_IPV6_MULTIPLE_TABLES + in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev); ++ in6_dev_put_clear(&net->ipv6.ip6_policy_failed_entry->rt6i_idev); + in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev); + #endif + } +@@ -6487,6 +6521,8 @@ static int __net_init ip6_route_net_init(struct net *net) + + #ifdef CONFIG_IPV6_MULTIPLE_TABLES + net->ipv6.fib6_has_custom_rules = false; ++ ++ + net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, + sizeof(*net->ipv6.ip6_prohibit_entry), + GFP_KERNEL); +@@ -6497,11 +6533,21 @@ static int __net_init ip6_route_net_init(struct net *net) + ip6_template_metrics, true); + INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->rt6i_uncached); + ++ 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_prohibit_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); ++ INIT_LIST_HEAD(&net->ipv6.ip6_policy_failed_entry->rt6i_uncached); ++ + net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, + sizeof(*net->ipv6.ip6_blk_hole_entry), + GFP_KERNEL); + if (!net->ipv6.ip6_blk_hole_entry) +- goto out_ip6_prohibit_entry; ++ goto out_ip6_policy_failed_entry; + 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); +@@ -6528,6 +6574,8 @@ static int __net_init ip6_route_net_init(struct net *net) + return ret; + + #ifdef CONFIG_IPV6_MULTIPLE_TABLES ++out_ip6_policy_failed_entry: ++ kfree(net->ipv6.ip6_policy_failed_entry); + out_ip6_prohibit_entry: + kfree(net->ipv6.ip6_prohibit_entry); + out_ip6_null_entry: +@@ -6547,6 +6595,7 @@ static void __net_exit ip6_route_net_exit(struct net *net) + kfree(net->ipv6.ip6_null_entry); + #ifdef CONFIG_IPV6_MULTIPLE_TABLES + kfree(net->ipv6.ip6_prohibit_entry); ++ kfree(net->ipv6.ip6_policy_failed_entry); + kfree(net->ipv6.ip6_blk_hole_entry); + #endif + dst_entries_destroy(&net->ipv6.ip6_dst_ops); +@@ -6624,6 +6673,9 @@ void __init ip6_route_init_special_entries(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 + } + +-- +2.37.2 + |