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openwrt/target/linux/generic/pending-6.6/670-ipv6-allow-rejecting-with-source-address-failed-policy.patch
John Audia 832e2f6dd0 kernel: bump 6.6 to 6.6.35 
Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.35

Removed upstreamed:
	bcm27xx/patches-6.6/950-1135-ax25-Fix-refcount-imbalance-on-inbound-connections.patch[1]

Removed no longer needed:
	generic/pending-6.6/779-net-vxlan-don-t-learn-non-unicast-L2-destinations.patch[2]

All other patches automatically rebased.

Build system: x86/64
Build-tested: x86/64/AMD Cezanne, flogic/glinet_gl-mt6000, flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3
Run-tested: x86/64/AMD Cezanne, flogic/glinet_gl-mt6000, flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3

1. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.35&id=52100fd74ad07b53a4666feafff1cd11436362d3
2. As suggested by @DragonBluep, "This patch can be removed. It will never return false. And the upstream commit should fix the same issue: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit?h=v6.6.35&id=924f7bbfc5cfd029e417c56357ca01eae681fba6"

Signed-off-by: John Audia <therealgraysky@proton.me>
2024-06-22 16:50:57 +02:00

264 lines
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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
@@ -86,6 +86,7 @@ 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;
--- 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,
};
--- 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
};
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -145,6 +145,10 @@ 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
@@ -2783,6 +2783,7 @@ 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
@@ -180,6 +180,7 @@ 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
@@ -221,6 +221,10 @@ static int __fib6_rule_action(struct fib
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
@@ -170,6 +170,8 @@ 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
@@ -98,6 +98,8 @@ 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,
@@ -318,6 +320,18 @@ static const struct rt6_info ip6_prohibi
.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
};
+static const struct rt6_info ip6_policy_failed_entry_template = {
+ .dst = {
+ .__rcuref = RCUREF_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 = {
.__rcuref = RCUREF_INIT(1),
@@ -1038,6 +1052,7 @@ 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,
@@ -1073,6 +1088,10 @@ static void ip6_rt_init_dst_reject(struc
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:
@@ -4544,6 +4563,17 @@ 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.
*/
@@ -5035,7 +5065,8 @@ 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)
@@ -6282,6 +6313,8 @@ 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
@@ -6293,6 +6326,7 @@ static int ip6_route_dev_notify(struct n
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
}
@@ -6493,6 +6527,8 @@ static int __net_init ip6_route_net_init
#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);
@@ -6503,11 +6539,21 @@ static int __net_init ip6_route_net_init
ip6_template_metrics, true);
INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->dst.rt_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->dst.rt_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);
@@ -6534,6 +6580,8 @@ out:
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:
@@ -6553,6 +6601,7 @@ static void __net_exit ip6_route_net_exi
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);
@@ -6636,6 +6685,9 @@ 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
}
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