6.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Florian Westphal <fw@xxxxxxxxx>
[ Upstream commit 8aae7625ff3f0bd5484d01f1b8d5af82e44bec2d ]
New skbs allocated via nf_send_reset() have skb->dev == NULL.
fib*_rules_early_flow_dissect helpers already have a 'struct net'
argument but its not passed down to the flow dissector core, which
will then WARN as it can't derive a net namespace to use:
WARNING: CPU: 0 PID: 0 at net/core/flow_dissector.c:1016 __skb_flow_dissect+0xa91/0x1cd0
[..]
ip_route_me_harder+0x143/0x330
nf_send_reset+0x17c/0x2d0 [nf_reject_ipv4]
nft_reject_inet_eval+0xa9/0xf2 [nft_reject_inet]
nft_do_chain+0x198/0x5d0 [nf_tables]
nft_do_chain_inet+0xa4/0x110 [nf_tables]
nf_hook_slow+0x41/0xc0
ip_local_deliver+0xce/0x110
..
Cc: Stanislav Fomichev <sdf@xxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxxx>
Cc: Ido Schimmel <idosch@xxxxxxxxxx>
Fixes: 812fa71f0d96 ("netfilter: Dissect flow after packet mangling")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217826
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Reviewed-by: Ido Schimmel <idosch@xxxxxxxxxx>
Reviewed-by: David Ahern <dsahern@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230830110043.30497-1-fw@xxxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
include/net/ip6_fib.h | 5 ++++-
include/net/ip_fib.h | 5 ++++-
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 05e6f756feafe..9ba6413fd2e3e 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -604,7 +604,10 @@ static inline bool fib6_rules_early_flow_dissect(struct net *net,
if (!net->ipv6.fib6_rules_require_fldissect)
return false;
- skb_flow_dissect_flow_keys(skb, flkeys, flag);
+ memset(flkeys, 0, sizeof(*flkeys));
+ __skb_flow_dissect(net, skb, &flow_keys_dissector,
+ flkeys, NULL, 0, 0, 0, flag);
+
fl6->fl6_sport = flkeys->ports.src;
fl6->fl6_dport = flkeys->ports.dst;
fl6->flowi6_proto = flkeys->basic.ip_proto;
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index a378eff827c74..f0c13864180e2 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -418,7 +418,10 @@ static inline bool fib4_rules_early_flow_dissect(struct net *net,
if (!net->ipv4.fib_rules_require_fldissect)
return false;
- skb_flow_dissect_flow_keys(skb, flkeys, flag);
+ memset(flkeys, 0, sizeof(*flkeys));
+ __skb_flow_dissect(net, skb, &flow_keys_dissector,
+ flkeys, NULL, 0, 0, 0, flag);
+
fl4->fl4_sport = flkeys->ports.src;
fl4->fl4_dport = flkeys->ports.dst;
fl4->flowi4_proto = flkeys->basic.ip_proto;
--
2.40.1
