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Date:      Tue, 24 Oct 2017 08:39:06 +0000 (UTC)
From:      "Andrey V. Elsukov" <ae@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r324947 - head/sys/netpfil/ipfw
Message-ID:  <201710240839.v9O8d6u0044399@repo.freebsd.org>
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Author: ae
Date: Tue Oct 24 08:39:05 2017
New Revision: 324947
URL: https://svnweb.freebsd.org/changeset/base/324947

Log:
  Add IPv6 support for O_TCPDATALEN opcode.
  
  PR:		222746
  MFC after:	1 week

Modified:
  head/sys/netpfil/ipfw/ip_fw2.c

Modified: head/sys/netpfil/ipfw/ip_fw2.c
==============================================================================
--- head/sys/netpfil/ipfw/ip_fw2.c	Tue Oct 24 06:49:06 2017	(r324946)
+++ head/sys/netpfil/ipfw/ip_fw2.c	Tue Oct 24 08:39:05 2017	(r324947)
@@ -963,7 +963,7 @@ ipfw_chk(struct ip_fw_args *args)
 	uint8_t proto;
 	uint16_t src_port = 0, dst_port = 0;	/* NOTE: host format	*/
 	struct in_addr src_ip, dst_ip;		/* NOTE: network format	*/
-	uint16_t iplen=0;
+	int iplen = 0;
 	int pktlen;
 	uint16_t	etype = 0;	/* Host order stored ether type */
 
@@ -1205,6 +1205,7 @@ do {								\
 		args->f_id.src_ip = 0;
 		args->f_id.dst_ip = 0;
 		args->f_id.flow_id6 = ntohl(ip6->ip6_flow);
+		iplen = ntohs(ip6->ip6_plen) + sizeof(*ip6);
 	} else if (pktlen >= sizeof(struct ip) &&
 	    (args->eh == NULL || etype == ETHERTYPE_IP) && ip->ip_v == 4) {
 	    	is_ipv4 = 1;
@@ -1219,7 +1220,6 @@ do {								\
 		dst_ip = ip->ip_dst;
 		offset = ntohs(ip->ip_off) & IP_OFFMASK;
 		iplen = ntohs(ip->ip_len);
-		pktlen = iplen < pktlen ? iplen : pktlen;
 
 		if (offset == 0) {
 			switch (proto) {
@@ -1258,6 +1258,7 @@ do {								\
 		args->f_id.dst_ip = ntohl(dst_ip.s_addr);
 	}
 #undef PULLUP_TO
+	pktlen = iplen < pktlen ? iplen: pktlen;
 	if (proto) { /* we may have port numbers, store them */
 		args->f_id.proto = proto;
 		args->f_id.src_port = src_port = ntohs(src_port);
@@ -1771,10 +1772,25 @@ do {								\
 				    uint16_t x;
 				    uint16_t *p;
 				    int i;
+#ifdef INET6
+				    if (is_ipv6) {
+					    struct ip6_hdr *ip6;
 
+					    ip6 = (struct ip6_hdr *)ip;
+					    if (ip6->ip6_plen == 0) {
+						    /*
+						     * Jumbo payload is not
+						     * supported by this
+						     * opcode.
+						     */
+						    break;
+					    }
+					    x = iplen - hlen;
+				    } else
+#endif /* INET6 */
+					    x = iplen - (ip->ip_hl << 2);
 				    tcp = TCP(ulp);
-				    x = iplen -
-					((ip->ip_hl + tcp->th_off) << 2);
+				    x -= tcp->th_off << 2;
 				    if (cmdlen == 1) {
 					match = (cmd->arg1 == x);
 					break;

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