mirror of
https://github.com/Telecominfraproject/wlan-ap.git
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89 lines
2.3 KiB
Diff
89 lines
2.3 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Sat, 26 Apr 2025 17:18:03 +0200
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Subject: [PATCH] net: ipv6: fix UDPv6 GSO segmentation with NAT
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If any address or port is changed, update it in all packets and recalculate
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checksum.
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Fixes: 9fd1ff5d2ac7 ("udp: Support UDP fraglist GRO/GSO.")
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/ipv4/udp_offload.c
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+++ b/net/ipv4/udp_offload.c
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@@ -247,6 +247,62 @@ static struct sk_buff *__udpv4_gso_segme
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return segs;
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}
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+static void __udpv6_gso_segment_csum(struct sk_buff *seg,
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+ struct in6_addr *oldip,
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+ const struct in6_addr *newip,
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+ __be16 *oldport, __be16 newport)
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+{
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+ struct udphdr *uh = udp_hdr(seg);
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+
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+ if (ipv6_addr_equal(oldip, newip) && *oldport == newport)
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+ return;
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+
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+ if (uh->check) {
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+ inet_proto_csum_replace16(&uh->check, seg, oldip->s6_addr32,
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+ newip->s6_addr32, true);
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+
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+ inet_proto_csum_replace2(&uh->check, seg, *oldport, newport,
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+ false);
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+ if (!uh->check)
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+ uh->check = CSUM_MANGLED_0;
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+ }
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+
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+ *oldip = *newip;
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+ *oldport = newport;
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+}
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+
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+static struct sk_buff *__udpv6_gso_segment_list_csum(struct sk_buff *segs)
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+{
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+ const struct ipv6hdr *iph;
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+ const struct udphdr *uh;
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+ struct ipv6hdr *iph2;
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+ struct sk_buff *seg;
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+ struct udphdr *uh2;
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+
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+ seg = segs;
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+ uh = udp_hdr(seg);
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+ iph = ipv6_hdr(seg);
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+ uh2 = udp_hdr(seg->next);
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+ iph2 = ipv6_hdr(seg->next);
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+
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+ if (!(*(const u32 *)&uh->source ^ *(const u32 *)&uh2->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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+ return segs;
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+
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+ while ((seg = seg->next)) {
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+ uh2 = udp_hdr(seg);
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+ iph2 = ipv6_hdr(seg);
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+
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+ __udpv6_gso_segment_csum(seg, &iph2->saddr, &iph->saddr,
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+ &uh2->source, uh->source);
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+ __udpv6_gso_segment_csum(seg, &iph2->daddr, &iph->daddr,
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+ &uh2->dest, uh->dest);
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+ }
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+
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+ return segs;
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+}
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+
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static struct sk_buff *__udp_gso_segment_list(struct sk_buff *skb,
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netdev_features_t features,
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bool is_ipv6)
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@@ -259,7 +315,10 @@ static struct sk_buff *__udp_gso_segment
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udp_hdr(skb)->len = htons(sizeof(struct udphdr) + mss);
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- return is_ipv6 ? skb : __udpv4_gso_segment_list_csum(skb);
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+ if (is_ipv6)
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+ return __udpv6_gso_segment_list_csum(skb);
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+ else
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+ return __udpv4_gso_segment_list_csum(skb);
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}
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struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
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