r4sas/ts3init_linux_netfilter_module
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added udp checksum calculation

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This commit is contained in:
Maximilian Münchow 2016-10-14 11:55:49 +02:00
parent 4ab6b8f09d
commit cc16338fc0
1 changed files with 6 additions and 0 deletions
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6
src/ts3init_target.c
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@ -422,6 +422,9 @@ ts3init_morph_to_get_cookie_ipv4_tg(struct sk_buff *skb, const struct xt_action_
udp->len = htons(sizeof(*udp) + sizeof(payload_buf));
udp->check = 0;
udp->check = csum_tcpudp_magic(ip->saddr, ip->daddr,
ntohs(udp->len), IPPROTO_UDP,
csum_partial(udp, ntohs(udp->len), 0));
ip->tot_len = htons(skb->len);
skb->ip_summed = CHECKSUM_NONE;
@ -457,6 +460,9 @@ ts3init_morph_to_get_cookie_ipv6_tg(struct sk_buff *skb, const struct xt_action_
udp->len = htons(sizeof(*udp) + sizeof(payload_buf));
udp->check = 0;
udp->check = csum_ipv6_magic(&ip->saddr, &ip->daddr,
ntohs(udp->len), IPPROTO_UDP,
csum_partial(udp, ntohs(udp->len), 0));
ip->payload_len = htons(skb->len);
skb->ip_summed = CHECKSUM_NONE;