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add a checksum routine for tcp over ipv6

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(This used to be ctdb commit b712762a1b8a3028625085e32136df4458b292c0)
This commit is contained in:
Ronnie Sahlberg 2008-05-14 12:25:55 +10:00
parent d3e24f744a
commit 7178dfb656
1 changed files with 24 additions and 0 deletions
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24
ctdb/common/system_linux.c
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@ -176,6 +176,30 @@ static uint16_t tcp_checksum(uint16_t *data, size_t n, struct iphdr *ip)
return sum2;
}
/*
calculate the tcp checksum for tcp over ipv6
*/
static uint16_t tcp_checksum6(uint16_t *data, size_t n, struct ip6_hdr *ip6)
{
uint32_t sum = uint16_checksum(data, n);
uint16_t sum2;
int i;
sum += uint16_checksum((uint16_t *)(void *)&ip6->ip6_src, 16);
sum += uint16_checksum((uint16_t *)(void *)&ip6->ip6_dst, 16);
sum += ip6->ip6_plen;
sum += ip6->ip6_nxt;
sum = (sum & 0xFFFF) + (sum >> 16);
sum = (sum & 0xFFFF) + (sum >> 16);
sum2 = htons(sum);
sum2 = ~sum2;
if (sum2 == 0) {
return 0xFFFF;
}
return sum2;
}
/*
Send tcp segment from the specified IP/port to the specified
destination IP/port.