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6443ebc3fd
Currently, we check the existing rtable in PREROUTING hook, if RTCF_LOCAL is set, we assume that the packet is loopback. But this assumption is incorrect, for example, a packet encapsulated in ipsec transport mode was received and routed to local, after decapsulation, it would be delivered to local again, and the rtable was not dropped, so RTCF_LOCAL check would trigger. But actually, the packet was not loopback. So for these normal loopback packets, we can check whether the in device is IFF_LOOPBACK or not. For these locally generated broadcast/multicast, we can check whether the skb->pkt_type is PACKET_LOOPBACK or not. Finally, there's a subtle difference between nft fib expr and xtables rpfilter extension, user can add the following nft rule to do strict rpfilter check: # nft add rule x y meta iif eth0 fib saddr . iif oif != eth0 drop So when the packet is loopback, it's better to store the in device instead of the LOOPBACK_IFINDEX, otherwise, after adding the above nft rule, locally generated broad/multicast packets will be dropped incorrectly. Fixes: |
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| .. | ||
| ip6_tables.c | ||
| ip6t_ah.c | ||
| ip6t_eui64.c | ||
| ip6t_frag.c | ||
| ip6t_hbh.c | ||
| ip6t_ipv6header.c | ||
| ip6t_MASQUERADE.c | ||
| ip6t_mh.c | ||
| ip6t_NPT.c | ||
| ip6t_REJECT.c | ||
| ip6t_rpfilter.c | ||
| ip6t_rt.c | ||
| ip6t_SYNPROXY.c | ||
| ip6table_filter.c | ||
| ip6table_mangle.c | ||
| ip6table_nat.c | ||
| ip6table_raw.c | ||
| ip6table_security.c | ||
| Kconfig | ||
| Makefile | ||
| nf_conntrack_l3proto_ipv6.c | ||
| nf_conntrack_proto_icmpv6.c | ||
| nf_conntrack_reasm.c | ||
| nf_defrag_ipv6_hooks.c | ||
| nf_dup_ipv6.c | ||
| nf_log_ipv6.c | ||
| nf_nat_l3proto_ipv6.c | ||
| nf_nat_masquerade_ipv6.c | ||
| nf_nat_proto_icmpv6.c | ||
| nf_reject_ipv6.c | ||
| nf_socket_ipv6.c | ||
| nf_tables_ipv6.c | ||
| nft_chain_nat_ipv6.c | ||
| nft_chain_route_ipv6.c | ||
| nft_dup_ipv6.c | ||
| nft_fib_ipv6.c | ||
| nft_masq_ipv6.c | ||
| nft_redir_ipv6.c | ||
| nft_reject_ipv6.c | ||