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tcp md5sig: Share MD5 Signature option parser between IPv4 and IPv6.

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Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
This commit is contained in:
YOSHIFUJI Hideaki
2008-04-17 12:29:53 +09:00
parent 81b302a321
commit 7d5d5525bd
4 changed files with 44 additions and 73 deletions
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33
net/ipv6/tcp_ipv6.c
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@@ -844,43 +844,12 @@ static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
struct tcp_md5sig_key *hash_expected;
struct ipv6hdr *ip6h = ipv6_hdr(skb);
struct tcphdr *th = tcp_hdr(skb);
int length = (th->doff << 2) - sizeof (*th);
int genhash;
u8 *ptr;
u8 newhash[16];
hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
hash_location = tcp_parse_md5sig_option(th);
/* If the TCP option is too short, we can short cut */
if (length < TCPOLEN_MD5SIG)
return hash_expected ? 1 : 0;
/* parse options */
ptr = (u8*)(th + 1);
while (length > 0) {
int opcode = *ptr++;
int opsize;
switch(opcode) {
case TCPOPT_EOL:
goto done_opts;
case TCPOPT_NOP:
length--;
continue;
default:
opsize = *ptr++;
if (opsize < 2 || opsize > length)
goto done_opts;
if (opcode == TCPOPT_MD5SIG) {
hash_location = ptr;
goto done_opts;
}
}
ptr += opsize - 2;
length -= opsize;
}
done_opts:
/* do we have a hash as expected? */
if (!hash_expected) {
if (!hash_location)