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https://blog.csdn.net/maimang1001/article/details/124857591
https://blog.csdn.net/weixin_35056480/article/details/116803025
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//arp内核过滤
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//iptables包的记录日志
nf_conntrack的记录:
kernel/msm-5.4/net/netfilter/nf_conntrack_proto.c
注册conntrack的几个hook:
- /* Connection tracking may drop packets, but never alters them, so
- * make it the first hook.
- */
- static const struct nf_hook_ops ipv4_conntrack_ops[] = {
- {
- .hook = ipv4_conntrack_in,
- .pf = NFPROTO_IPV4,
- .hooknum = NF_INET_PRE_ROUTING,
- .priority = NF_IP_PRI_CONNTRACK,
- },
- {
- .hook = ipv4_conntrack_local,
- .pf = NFPROTO_IPV4,
- .hooknum = NF_INET_LOCAL_OUT,
- .priority = NF_IP_PRI_CONNTRACK,
- },
- {
- .hook = ipv4_confirm,
- .pf = NFPROTO_IPV4,
- .hooknum = NF_INET_POST_ROUTING,
- .priority = NF_IP_PRI_CONNTRACK_CONFIRM,
- },
- {
- .hook = ipv4_confirm,
- .pf = NFPROTO_IPV4,
- .hooknum = NF_INET_LOCAL_IN,
- .priority = NF_IP_PRI_CONNTRACK_CONFIRM,
- },
- };
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