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Revert "netfilter: nf_reject_ipv6: fix nf_reject_ip6_tcphdr_put()"

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This reverts commit 103bb84d43.
This commit is contained in:
Ksawlii 2024-11-24 00:23:18 +01:00
parent cca2e810e8
commit fffb3a7453
1 changed files with 12 additions and 2 deletions
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14
net/ipv6/netfilter/nf_reject_ipv6.c
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@ -89,23 +89,33 @@ void nf_reject_ip6_tcphdr_put(struct sk_buff *nskb,
const struct tcphdr *oth, unsigned int otcplen)
{
struct tcphdr *tcph;
int needs_ack;
skb_reset_transport_header(nskb);
tcph = skb_put_zero(nskb, sizeof(struct tcphdr));
tcph = skb_put(nskb, sizeof(struct tcphdr));
/* Truncate to length (no data) */
tcph->doff = sizeof(struct tcphdr)/4;
tcph->source = oth->dest;
tcph->dest = oth->source;
if (oth->ack) {
needs_ack = 0;
tcph->seq = oth->ack_seq;
tcph->ack_seq = 0;
} else {
needs_ack = 1;
tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin +
otcplen - (oth->doff<<2));
tcph->ack = 1;
tcph->seq = 0;
}
/* Reset flags */
((u_int8_t *)tcph)[13] = 0;
tcph->rst = 1;
tcph->ack = needs_ack;
tcph->window = 0;
tcph->urg_ptr = 0;
tcph->check = 0;
/* Adjust TCP checksum */
tcph->check = csum_ipv6_magic(&ipv6_hdr(nskb)->saddr,