Fix GRE over IPv6 tunnels with IPFW
Previously, GRE packets in IPv6 tunnels would be dropped by IPFW (unless net.inet6.ip6.fw.deny_unknown_exthdrs was unset). PR: 220640 Submitted by: Kun Xie <kxie@xiplink.com> MFC after: 1 week
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@ -92,6 +92,8 @@ __FBSDID("$FreeBSD$");
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#include <netinet6/ip6_var.h>
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#endif
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#include <net/if_gre.h> /* for struct grehdr */
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#include <netpfil/ipfw/ip_fw_private.h>
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#include <machine/in_cksum.h> /* XXX for in_cksum */
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@ -1162,6 +1164,11 @@ do { \
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PULLUP_TO(hlen, ulp, struct pim);
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break;
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case IPPROTO_GRE: /* RFC 1701 */
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/* XXX GRE header check? */
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PULLUP_TO(hlen, ulp, struct grehdr);
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break;
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case IPPROTO_CARP:
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PULLUP_TO(hlen, ulp, struct carp_header);
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if (((struct carp_header *)ulp)->carp_version !=
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