78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/*
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* PF-on-Linux netfilter hook registration + engine status surface.
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* The verdict path is staged pf.c (pf_test()); hook→pf_test wiring with
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* mbuf ingress is milestone M2's data-path task — until then the hooks
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* accept so the module is inert once loaded (never silent: pr_info at
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* registration says so). (ISC 2026)
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*/
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#include <pfk.h>
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#include <pfk_api.h>
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#include <net/pfvar.h>
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#include <net/pfvar_priv.h>
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static int pfk_enabled = 1; /* like pf_defaultwise/pf_enable on boot */
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static struct pf_status pfk_stat;
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void pfk_status(struct pf_status *s)
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{
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if (s)
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*s = pfk_stat;
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}
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int pfk_enable(int on)
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{
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pfk_enabled = on ? 1 : 0;
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return 0;
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}
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/* --- netfilter hooks: ingress/egress plumbing --- */
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static unsigned int
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pfk_ipv4_hook(void *priv, struct sk_buff *skb, const struct nf_hook_state *st)
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{
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/* PFLINUX M1: pf_test() routing arrives with the M2 data-path task;
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* until then the hooks accept (module inert). */
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return NF_ACCEPT;
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}
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static struct nf_hook_ops pfk_hooks[] = {
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{ .hook = pfk_ipv4_hook, .pf = NFPROTO_IPV4, .hooknum = NF_INET_PRE_ROUTING,
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.priority = NF_IP_PRI_FIRST },
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{ .hook = pfk_ipv4_hook, .pf = NFPROTO_IPV4, .hooknum = NF_INET_LOCAL_IN,
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.priority = NF_IP_PRI_FIRST + 1 },
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{ .hook = pfk_ipv4_hook, .pf = NFPROTO_IPV4, .hooknum = NF_INET_FORWARD,
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.priority = NF_IP_PRI_FIRST },
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{ .hook = pfk_ipv4_hook, .pf = NFPROTO_IPV4, .hooknum = NF_INET_LOCAL_OUT,
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.priority = NF_IP_PRI_CONNTRACK + 1 },
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{ .hook = pfk_ipv4_hook, .pf = NFPROTO_IPV4, .hooknum = NF_INET_POST_ROUTING,
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.priority = NF_IP_PRI_LAST - 1 },
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};
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#define PFK_NHOOKS ARRAY_SIZE(pfk_hooks)
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int
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pfk_hooks_register(void)
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{
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int i, err;
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pr_info("pfk: netfilter hooks registered (verdict path inert until M2)\n");
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for (i = 0; i < PFK_NHOOKS; i++) {
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pfk_hooks[i].priv = NULL;
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err = nf_register_net_hook(&init_net, &pfk_hooks[i]);
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if (err)
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goto fail;
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}
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return 0;
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fail:
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while (--i >= 0)
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nf_unregister_net_hook(&init_net, &pfk_hooks[i]);
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return err;
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}
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void
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pfk_hooks_unregister(void)
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{
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int i;
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for (i = 0; i < PFK_NHOOKS; i++)
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nf_unregister_net_hook(&init_net, &pfk_hooks[i]);
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}
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