[ovs-dev] conntrack: check the result of extract_l3_ipv4/6
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Message ID 1566193181-5477-1-git-send-email-lirongqing@baidu.com
State New
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  • [ovs-dev] conntrack: check the result of extract_l3_ipv4/6
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Commit Message

Li RongQing Aug. 19, 2019, 5:39 a.m. UTC
the result of extract_l3_ipv4/6 should be checked in reverse_nat_packet
when it is false, meaning this packet is wrong, should not do handle it
continually

Signed-off-by: Li RongQing <lirongqing@baidu.com>
---
 lib/conntrack.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

Patch
diff mbox series

diff --git a/lib/conntrack.c b/lib/conntrack.c
index 5f60fea18..c26d5438c 100644
--- a/lib/conntrack.c
+++ b/lib/conntrack.c
@@ -695,11 +695,18 @@  reverse_nat_packet(struct dp_packet *pkt, const struct conn *conn)
     uint16_t orig_l4_ofs = pkt->l4_ofs;
 
     if (conn->key.dl_type == htons(ETH_TYPE_IP)) {
+        bool ok;
         struct ip_header *nh = dp_packet_l3(pkt);
         struct icmp_header *icmp = dp_packet_l4(pkt);
         struct ip_header *inner_l3 = (struct ip_header *) (icmp + 1);
-        extract_l3_ipv4(&inner_key, inner_l3, tail - ((char *)inner_l3) - pad,
+
+        ok = extract_l3_ipv4(&inner_key, inner_l3,
+                        tail - ((char *)inner_l3) - pad,
                         &inner_l4, false);
+        if (!ok) {
+            return;
+        }
+
         pkt->l3_ofs += (char *) inner_l3 - (char *) nh;
         pkt->l4_ofs += inner_l4 - (char *) icmp;
 
@@ -715,13 +722,19 @@  reverse_nat_packet(struct dp_packet *pkt, const struct conn *conn)
         icmp->icmp_csum = 0;
         icmp->icmp_csum = csum(icmp, tail - (char *) icmp - pad);
     } else {
+        bool ok;
         struct ovs_16aligned_ip6_hdr *nh6 = dp_packet_l3(pkt);
         struct icmp6_error_header *icmp6 = dp_packet_l4(pkt);
         struct ovs_16aligned_ip6_hdr *inner_l3_6 =
             (struct ovs_16aligned_ip6_hdr *) (icmp6 + 1);
-        extract_l3_ipv6(&inner_key, inner_l3_6,
+
+        ok = extract_l3_ipv6(&inner_key, inner_l3_6,
                         tail - ((char *)inner_l3_6) - pad,
                         &inner_l4);
+
+        if (!ok) {
+            return;
+        }
         pkt->l3_ofs += (char *) inner_l3_6 - (char *) nh6;
         pkt->l4_ofs += inner_l4 - (char *) icmp6;