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![Florian Westphal](/assets/img/avatar_default.png)
Defer registration of the synproxy hooks until the first SYNPROXY rule is added. Also means we only register hooks in namespaces that need it. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
#ifndef _NF_CONNTRACK_SYNPROXY_H
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#define _NF_CONNTRACK_SYNPROXY_H
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#include <net/netns/generic.h>
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struct nf_conn_synproxy {
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u32 isn;
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u32 its;
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u32 tsoff;
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};
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static inline struct nf_conn_synproxy *nfct_synproxy(const struct nf_conn *ct)
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{
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#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
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return nf_ct_ext_find(ct, NF_CT_EXT_SYNPROXY);
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#else
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return NULL;
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#endif
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}
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static inline struct nf_conn_synproxy *nfct_synproxy_ext_add(struct nf_conn *ct)
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{
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#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
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return nf_ct_ext_add(ct, NF_CT_EXT_SYNPROXY, GFP_ATOMIC);
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#else
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return NULL;
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#endif
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}
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static inline bool nf_ct_add_synproxy(struct nf_conn *ct,
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const struct nf_conn *tmpl)
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{
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if (tmpl && nfct_synproxy(tmpl)) {
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if (!nfct_seqadj_ext_add(ct))
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return false;
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if (!nfct_synproxy_ext_add(ct))
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return false;
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}
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return true;
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}
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struct synproxy_stats {
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unsigned int syn_received;
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unsigned int cookie_invalid;
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unsigned int cookie_valid;
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unsigned int cookie_retrans;
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unsigned int conn_reopened;
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};
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struct synproxy_net {
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struct nf_conn *tmpl;
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struct synproxy_stats __percpu *stats;
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unsigned int hook_ref4;
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unsigned int hook_ref6;
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};
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extern unsigned int synproxy_net_id;
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static inline struct synproxy_net *synproxy_pernet(struct net *net)
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{
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return net_generic(net, synproxy_net_id);
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}
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struct synproxy_options {
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u8 options;
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u8 wscale;
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u16 mss;
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u32 tsval;
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u32 tsecr;
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};
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struct tcphdr;
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struct xt_synproxy_info;
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bool synproxy_parse_options(const struct sk_buff *skb, unsigned int doff,
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const struct tcphdr *th,
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struct synproxy_options *opts);
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unsigned int synproxy_options_size(const struct synproxy_options *opts);
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void synproxy_build_options(struct tcphdr *th,
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const struct synproxy_options *opts);
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void synproxy_init_timestamp_cookie(const struct xt_synproxy_info *info,
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struct synproxy_options *opts);
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void synproxy_check_timestamp_cookie(struct synproxy_options *opts);
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unsigned int synproxy_tstamp_adjust(struct sk_buff *skb, unsigned int protoff,
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struct tcphdr *th, struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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const struct nf_conn_synproxy *synproxy);
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#endif /* _NF_CONNTRACK_SYNPROXY_H */
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