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Pass a network namespace parameter into the netfilter hooks. At the call site of the netfilter hooks the path a packet is taking through the network stack is well known which allows the network namespace to be easily and reliabily. This allows the replacement of magic code like "dev_net(state->in?:state->out)" that appears at the start of most netfilter hooks with "state->net". In almost all cases the network namespace passed in is derived from the first network device passed in, guaranteeing those paths will not see any changes in practice. The exceptions are: xfrm/xfrm_output.c:xfrm_output_resume() xs_net(skb_dst(skb)->xfrm) ipvs/ip_vs_xmit.c:ip_vs_nat_send_or_cont() ip_vs_conn_net(cp) ipvs/ip_vs_xmit.c:ip_vs_send_or_cont() ip_vs_conn_net(cp) ipv4/raw.c:raw_send_hdrinc() sock_net(sk) ipv6/ip6_output.c:ip6_xmit() sock_net(sk) ipv6/ndisc.c:ndisc_send_skb() dev_net(skb->dev) not dev_net(dst->dev) ipv6/raw.c:raw6_send_hdrinc() sock_net(sk) br_netfilter_hooks.c:br_nf_pre_routing_finish() dev_net(skb->dev) before skb->dev is set to nf_bridge->physindev In all cases these exceptions seem to be a better expression for the network namespace the packet is being processed in then the historic "dev_net(in?in:out)". I am documenting them in case something odd pops up and someone starts trying to track down what happened. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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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_tables_ipv6.c | ||
nft_chain_nat_ipv6.c | ||
nft_chain_route_ipv6.c | ||
nft_dup_ipv6.c | ||
nft_masq_ipv6.c | ||
nft_redir_ipv6.c | ||
nft_reject_ipv6.c |