1 files changed, 8 insertions, 10 deletions

diff --git a/net/eth.c b/net/eth.c
index 70bcd8e355..d7b30df79f 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -136,7 +136,7 @@ _eth_tcp_has_data(bool is_ip4,
     return l4len > TCP_HEADER_DATA_OFFSET(tcp);
 }
 
-void eth_get_protocols(const struct iovec *iov, int iovcnt,
+void eth_get_protocols(const struct iovec *iov, size_t iovcnt, size_t iovoff,
                        bool *hasip4, bool *hasip6,
                        size_t *l3hdr_off,
                        size_t *l4hdr_off,
@@ -147,26 +147,24 @@ void eth_get_protocols(const struct iovec *iov, int iovcnt,
 {
     int proto;
     bool fragment = false;
-    size_t l2hdr_len = eth_get_l2_hdr_length_iov(iov, iovcnt);
     size_t input_size = iov_size(iov, iovcnt);
     size_t copied;
     uint8_t ip_p;
 
     *hasip4 = *hasip6 = false;
+    *l3hdr_off = iovoff + eth_get_l2_hdr_length_iov(iov, iovcnt, iovoff);
     l4hdr_info->proto = ETH_L4_HDR_PROTO_INVALID;
 
-    proto = eth_get_l3_proto(iov, iovcnt, l2hdr_len);
-
-    *l3hdr_off = l2hdr_len;
+    proto = eth_get_l3_proto(iov, iovcnt, *l3hdr_off);
 
     if (proto == ETH_P_IP) {
         struct ip_header *iphdr = &ip4hdr_info->ip4_hdr;
 
-        if (input_size < l2hdr_len) {
+        if (input_size < *l3hdr_off) {
             return;
         }
 
-        copied = iov_to_buf(iov, iovcnt, l2hdr_len, iphdr, sizeof(*iphdr));
+        copied = iov_to_buf(iov, iovcnt, *l3hdr_off, iphdr, sizeof(*iphdr));
         if (copied < sizeof(*iphdr) ||
             IP_HEADER_VERSION(iphdr) != IP_HEADER_VERSION_4) {
             return;
@@ -175,17 +173,17 @@ void eth_get_protocols(const struct iovec *iov, int iovcnt,
         *hasip4 = true;
         ip_p = iphdr->ip_p;
         ip4hdr_info->fragment = IP4_IS_FRAGMENT(iphdr);
-        *l4hdr_off = l2hdr_len + IP_HDR_GET_LEN(iphdr);
+        *l4hdr_off = *l3hdr_off + IP_HDR_GET_LEN(iphdr);
 
         fragment = ip4hdr_info->fragment;
     } else if (proto == ETH_P_IPV6) {
-        if (!eth_parse_ipv6_hdr(iov, iovcnt, l2hdr_len, ip6hdr_info)) {
+        if (!eth_parse_ipv6_hdr(iov, iovcnt, *l3hdr_off, ip6hdr_info)) {
             return;
         }
 
         *hasip6 = true;
         ip_p = ip6hdr_info->l4proto;
-        *l4hdr_off = l2hdr_len + ip6hdr_info->full_hdr_len;
+        *l4hdr_off = *l3hdr_off + ip6hdr_info->full_hdr_len;
         fragment = ip6hdr_info->fragment;
     } else {
         return;