From bee88cd5bd83d40b8aec4d6cb729378f707f6197 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Thu, 2 May 2024 10:44:43 +0200 Subject: net: add support for segmenting TCP fraglist GSO packets Preparation for adding TCP fraglist GRO support. It expects packets to be combined in a similar way as UDP fraglist GSO packets. For IPv4 packets, NAT is handled in the same way as UDP fraglist GSO. Acked-by: Paolo Abeni Reviewed-by: Eric Dumazet Signed-off-by: Felix Fietkau Reviewed-by: David Ahern Reviewed-by: Willem de Bruijn Signed-off-by: Paolo Abeni --- net/ipv4/tcp_offload.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) (limited to 'net/ipv4/tcp_offload.c') diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c index fab0973f995b..affd4ed28cfe 100644 --- a/net/ipv4/tcp_offload.c +++ b/net/ipv4/tcp_offload.c @@ -28,6 +28,70 @@ static void tcp_gso_tstamp(struct sk_buff *skb, unsigned int ts_seq, } } +static void __tcpv4_gso_segment_csum(struct sk_buff *seg, + __be32 *oldip, __be32 newip, + __be16 *oldport, __be16 newport) +{ + struct tcphdr *th; + struct iphdr *iph; + + if (*oldip == newip && *oldport == newport) + return; + + th = tcp_hdr(seg); + iph = ip_hdr(seg); + + inet_proto_csum_replace4(&th->check, seg, *oldip, newip, true); + inet_proto_csum_replace2(&th->check, seg, *oldport, newport, false); + *oldport = newport; + + csum_replace4(&iph->check, *oldip, newip); + *oldip = newip; +} + +static struct sk_buff *__tcpv4_gso_segment_list_csum(struct sk_buff *segs) +{ + const struct tcphdr *th; + const struct iphdr *iph; + struct sk_buff *seg; + struct tcphdr *th2; + struct iphdr *iph2; + + seg = segs; + th = tcp_hdr(seg); + iph = ip_hdr(seg); + th2 = tcp_hdr(seg->next); + iph2 = ip_hdr(seg->next); + + if (!(*(const u32 *)&th->source ^ *(const u32 *)&th2->source) && + iph->daddr == iph2->daddr && iph->saddr == iph2->saddr) + return segs; + + while ((seg = seg->next)) { + th2 = tcp_hdr(seg); + iph2 = ip_hdr(seg); + + __tcpv4_gso_segment_csum(seg, + &iph2->saddr, iph->saddr, + &th2->source, th->source); + __tcpv4_gso_segment_csum(seg, + &iph2->daddr, iph->daddr, + &th2->dest, th->dest); + } + + return segs; +} + +static struct sk_buff *__tcp4_gso_segment_list(struct sk_buff *skb, + netdev_features_t features) +{ + skb = skb_segment_list(skb, features, skb_mac_header_len(skb)); + if (IS_ERR(skb)) + return skb; + + return __tcpv4_gso_segment_list_csum(skb); +} + static struct sk_buff *tcp4_gso_segment(struct sk_buff *skb, netdev_features_t features) { @@ -37,6 +101,9 @@ static struct sk_buff *tcp4_gso_segment(struct sk_buff *skb, if (!pskb_may_pull(skb, sizeof(struct tcphdr))) return ERR_PTR(-EINVAL); + if (skb_shinfo(skb)->gso_type & SKB_GSO_FRAGLIST) + return __tcp4_gso_segment_list(skb, features); + if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { const struct iphdr *iph = ip_hdr(skb); struct tcphdr *th = tcp_hdr(skb); -- cgit v1.2.3