00e4b23e27
Add missing checksum update Fixes: https://github.com/openwrt/openwrt/issues/15857 Signed-off-by: Felix Fietkau <nbd@nbd.name>
55 lines
1.6 KiB
Diff
55 lines
1.6 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Mon, 24 Feb 2025 12:18:23 +0100
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Subject: [PATCH] net: ipv6: fix TCP GSO segmentation with NAT
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When updating the source/destination address, the TCP/UDP checksum needs to
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be updated as well.
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Fixes: bee88cd5bd83 ("net: add support for segmenting TCP fraglist GSO packets")
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/ipv6/tcpv6_offload.c
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+++ b/net/ipv6/tcpv6_offload.c
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@@ -112,24 +112,36 @@ static struct sk_buff *__tcpv6_gso_segme
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struct sk_buff *seg;
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struct tcphdr *th2;
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struct ipv6hdr *iph2;
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+ bool addr_equal;
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seg = segs;
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th = tcp_hdr(seg);
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iph = ipv6_hdr(seg);
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th2 = tcp_hdr(seg->next);
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iph2 = ipv6_hdr(seg->next);
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+ addr_equal = ipv6_addr_equal(&iph->saddr, &iph2->saddr) &&
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+ ipv6_addr_equal(&iph->daddr, &iph2->daddr);
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if (!(*(const u32 *)&th->source ^ *(const u32 *)&th2->source) &&
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- ipv6_addr_equal(&iph->saddr, &iph2->saddr) &&
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- ipv6_addr_equal(&iph->daddr, &iph2->daddr))
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+ addr_equal)
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return segs;
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while ((seg = seg->next)) {
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th2 = tcp_hdr(seg);
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iph2 = ipv6_hdr(seg);
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- iph2->saddr = iph->saddr;
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- iph2->daddr = iph->daddr;
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+ if (!addr_equal) {
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+ inet_proto_csum_replace16(&th2->check, seg,
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+ iph2->saddr.s6_addr32,
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+ iph->saddr.s6_addr32,
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+ true);
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+ inet_proto_csum_replace16(&th2->check, seg,
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+ iph2->daddr.s6_addr32,
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+ iph->daddr.s6_addr32,
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+ true);
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+ iph2->saddr = iph->saddr;
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+ iph2->daddr = iph->daddr;
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+ }
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__tcpv6_gso_segment_csum(seg, &th2->source, th->source);
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__tcpv6_gso_segment_csum(seg, &th2->dest, th->dest);
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}
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