diff options
Diffstat (limited to 'checksum.c')
| -rw-r--r-- | checksum.c | 7 |
1 files changed, 5 insertions, 2 deletions
@@ -108,10 +108,13 @@ uint16_t csum_unaligned(const void *buf, size_t len, uint32_t init) */ void csum_tcp4(struct iphdr *iph) { - struct tcphdr *th = (struct tcphdr *)((char *)iph + iph->ihl * 4); - uint16_t tlen = ntohs(iph->tot_len) - iph->ihl * 4, *p = (uint16_t *)th; + uint16_t tlen = ntohs(iph->tot_len) - iph->ihl * 4, *p; + struct tcphdr *th; uint32_t sum = 0; + th = (struct tcphdr *)((char *)iph + (intptr_t)(iph->ihl * 4)); + p = (uint16_t *)th; + sum += (iph->saddr >> 16) & 0xffff; sum += iph->saddr & 0xffff; sum += (iph->daddr >> 16) & 0xffff; |