Requeue mbuf via netisr when we use IPSec tunnel mode and IPv6.
ipsec6_common_input_cb() uses partial copy of ip6_input() to parse headers. But this isn't correct, when we use tunnel mode IPSec. When we stripped outer IPv6 header from the decrypted packet, it can become IPv4 packet and should be handled by ip_input. Also when we use tunnel mode IPSec with IPv6 traffic, we should pass decrypted packet with inner IPv6 header to ip6_input, it will correctly handle it and also can decide to forward it. The "skip" variable points to offset where payload starts. In tunnel mode we reset it to zero after stripping the outer header. So, when it is zero, we should requeue mbuf via netisr. Differential Revision: https://reviews.freebsd.org/D2306 Reviewed by: adrian, gnn Sponsored by: Yandex LLC
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parent
1ae800e7a6
commit
1d3b268c04
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=281694
@ -627,7 +627,7 @@ ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip,
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struct m_tag *mtag;
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struct tdb_ident *tdbi;
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struct secasindex *saidx;
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int nxt;
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int nxt, isr_prot;
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u_int8_t nxt8;
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int error, nest;
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#ifdef notyet
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@ -803,6 +803,35 @@ ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip,
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if ((error = ipsec_filter(&m, PFIL_IN, ENC_IN|ENC_AFTER)) != 0)
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return (error);
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#endif /* DEV_ENC */
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if (skip == 0) {
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/*
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* We stripped outer IPv6 header.
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* Now we should requeue decrypted packet via netisr.
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*/
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switch (prot) {
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#ifdef INET
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case IPPROTO_IPIP:
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isr_prot = NETISR_IP;
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break;
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#endif
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case IPPROTO_IPV6:
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isr_prot = NETISR_IPV6;
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break;
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default:
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DPRINTF(("%s: cannot handle inner ip proto %d\n",
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__func__, prot));
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IPSEC_ISTAT(sproto, nopf);
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error = EPFNOSUPPORT;
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goto bad;
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}
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error = netisr_queue_src(isr_prot, (uintptr_t)sav->spi, m);
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if (error) {
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IPSEC_ISTAT(sproto, qfull);
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DPRINTF(("%s: queue full; proto %u packet dropped\n",
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__func__, sproto));
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}
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return (error);
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}
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/*
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* See the end of ip6_input for this logic.
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* IPPROTO_IPV[46] case will be processed just like other ones
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