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| author | Florian Westphal <fw@strlen.de> | 2023-10-26 16:45:42 +0200 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2023-10-27 10:12:09 +0200 |
| commit | eefed7662ff223f70ba8b1af07f1a096a5ece588 (patch) | |
| tree | 4699ec490e0ab0364feacc96a1723d4f38dea25e | |
| parent | 53a5b4f2ea858482a427878bca988a7fa9b2ebdc (diff) | |
| download | linux-eefed7662ff223f70ba8b1af07f1a096a5ece588.tar.gz linux-eefed7662ff223f70ba8b1af07f1a096a5ece588.tar.bz2 linux-eefed7662ff223f70ba8b1af07f1a096a5ece588.zip | |
xfrm: policy: fix layer 4 flowi decoding
The commit shipped with two bugs:
fl4->fl4_icmp_type = flkeys->icmp.type;
fl4->fl4_icmp_type = flkeys->icmp.code;
~~~~ should have been "code".
But the more severe bug is that I got fooled by flowi member defines:
fl4_icmp_type, fl4_gre_key and fl4_dport share the same union/address.
Fix typo and make gre/icmp key setting depend on the l4 protocol.
Fixes: 7a0207094f1b ("xfrm: policy: replace session decode with flow dissector")
Reported-and-tested-by: Antony Antony <antony@phenome.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 6aea8b2f45e0..d2dddc570f4f 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -3400,11 +3400,18 @@ decode_session4(const struct xfrm_flow_keys *flkeys, struct flowi *fl, bool reve fl4->fl4_dport = flkeys->ports.dst; } + switch (flkeys->basic.ip_proto) { + case IPPROTO_GRE: + fl4->fl4_gre_key = flkeys->gre.keyid; + break; + case IPPROTO_ICMP: + fl4->fl4_icmp_type = flkeys->icmp.type; + fl4->fl4_icmp_code = flkeys->icmp.code; + break; + } + fl4->flowi4_proto = flkeys->basic.ip_proto; fl4->flowi4_tos = flkeys->ip.tos; - fl4->fl4_icmp_type = flkeys->icmp.type; - fl4->fl4_icmp_type = flkeys->icmp.code; - fl4->fl4_gre_key = flkeys->gre.keyid; } #if IS_ENABLED(CONFIG_IPV6) @@ -3427,10 +3434,17 @@ decode_session6(const struct xfrm_flow_keys *flkeys, struct flowi *fl, bool reve fl6->fl6_dport = flkeys->ports.dst; } + switch (flkeys->basic.ip_proto) { + case IPPROTO_GRE: + fl6->fl6_gre_key = flkeys->gre.keyid; + break; + case IPPROTO_ICMPV6: + fl6->fl6_icmp_type = flkeys->icmp.type; + fl6->fl6_icmp_code = flkeys->icmp.code; + break; + } + fl6->flowi6_proto = flkeys->basic.ip_proto; - fl6->fl6_icmp_type = flkeys->icmp.type; - fl6->fl6_icmp_type = flkeys->icmp.code; - fl6->fl6_gre_key = flkeys->gre.keyid; } #endif |