X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=flowspec-xdp;a=blobdiff_plain;f=xdp.c;h=4e4d6c6308437ed759239c1f166f982dca36256c;hp=01feac657723f2e290a91f5d9721752626b5ee14;hb=a8be3b609743627f58a464d7b75217a778eb4fa9;hpb=827e945d6361b743f2b9c765758e914ccc2a689e

diff --git a/xdp.c b/xdp.c
index 01feac6..4e4d6c6 100644
--- a/xdp.c
+++ b/xdp.c
@@ -204,7 +204,7 @@ int xdp_drop_prog(struct xdp_md *ctx)
 
 	const void *l4hdr = NULL;
 	const struct tcphdr *tcp = NULL;
-	const struct udphdr *udp = NULL;
+	uint8_t ports_valid = 0;
 	uint16_t sport, dport; // Host Endian! Only valid with tcp || udp
 
 #ifdef NEED_V4_PARSE
@@ -227,11 +227,13 @@ int xdp_drop_prog(struct xdp_md *ctx)
 				tcp = (struct tcphdr*) l4hdr;
 				sport = BE16(tcp->source);
 				dport = BE16(tcp->dest);
+				ports_valid = 1;
 			} else if (ip->protocol == IP_PROTO_UDP) {
 				CHECK_LEN(l4hdr, udphdr);
-				udp = (struct udphdr*) l4hdr;
+				const struct udphdr *udp = (struct udphdr*) l4hdr;
 				sport = BE16(udp->source);
 				dport = BE16(udp->dest);
+				ports_valid = 1;
 			} else if (ip->protocol == IP_PROTO_ICMP) {
 				CHECK_LEN(l4hdr, icmphdr);
 				icmp = (struct icmphdr*) l4hdr;
@@ -272,11 +274,13 @@ int xdp_drop_prog(struct xdp_md *ctx)
 				tcp = (struct tcphdr*) l4hdr;
 				sport = BE16(tcp->source);
 				dport = BE16(tcp->dest);
+				ports_valid = 1;
 			} else if (v6nexthdr == IP_PROTO_UDP) {
 				CHECK_LEN(l4hdr, udphdr);
-				udp = (struct udphdr*) l4hdr;
+				const struct udphdr *udp = (struct udphdr*) l4hdr;
 				sport = BE16(udp->source);
 				dport = BE16(udp->dest);
+				ports_valid = 1;
 			} else if (v6nexthdr == IP6_PROTO_ICMPV6) {
 				CHECK_LEN(l4hdr, icmp6hdr);
 				icmpv6 = (struct icmp6hdr*) l4hdr;