diff options
Diffstat (limited to 'checksum.c')
| -rw-r--r-- | checksum.c | 16 |
1 files changed, 8 insertions, 8 deletions
@@ -84,16 +84,16 @@ uint16_t ip_checksum(const void *data, int len) { /* function: ipv6_pseudo_header_checksum * calculate the pseudo header checksum for use in tcp/udp/icmp headers - * ip6 - the ipv6 header - * len - the transport length (transport header + payload) - * protocol - the transport layer protocol, can be different from ip6->ip6_nxt for fragments + * current - the current checksum or 0 to start a new checksum + * ip6 - the ipv6 header + * len - the transport length (transport header + payload) */ -uint32_t ipv6_pseudo_header_checksum(const struct ip6_hdr *ip6, uint16_t len, uint8_t protocol) { +uint32_t ipv6_pseudo_header_checksum(uint32_t current, const struct ip6_hdr *ip6, uint16_t len) { uint32_t checksum_len, checksum_next; + checksum_len = htonl((uint32_t) len); - checksum_next = htonl(protocol); + checksum_next = htonl(ip6->ip6_nxt); - uint32_t current = 0; current = ip_checksum_add(current, &(ip6->ip6_src), sizeof(struct in6_addr)); current = ip_checksum_add(current, &(ip6->ip6_dst), sizeof(struct in6_addr)); current = ip_checksum_add(current, &checksum_len, sizeof(checksum_len)); @@ -104,16 +104,16 @@ uint32_t ipv6_pseudo_header_checksum(const struct ip6_hdr *ip6, uint16_t len, ui /* function: ipv4_pseudo_header_checksum * calculate the pseudo header checksum for use in tcp/udp headers + * current - the current checksum or 0 to start a new checksum * ip - the ipv4 header * len - the transport length (transport header + payload) */ -uint32_t ipv4_pseudo_header_checksum(const struct iphdr *ip, uint16_t len) { +uint32_t ipv4_pseudo_header_checksum(uint32_t current, const struct iphdr *ip, uint16_t len) { uint16_t temp_protocol, temp_length; temp_protocol = htons(ip->protocol); temp_length = htons(len); - uint32_t current = 0; current = ip_checksum_add(current, &(ip->saddr), sizeof(uint32_t)); current = ip_checksum_add(current, &(ip->daddr), sizeof(uint32_t)); current = ip_checksum_add(current, &temp_protocol, sizeof(uint16_t)); |