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79 lines
1.9 KiB
79 lines
1.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* IPV6 GSO/GRO offload support |
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* Linux INET6 implementation |
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* |
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* TCPv6 GSO/GRO support |
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*/ |
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#include <linux/indirect_call_wrapper.h> |
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#include <linux/skbuff.h> |
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#include <net/gro.h> |
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#include <net/protocol.h> |
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#include <net/tcp.h> |
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#include <net/ip6_checksum.h> |
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#include "ip6_offload.h" |
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INDIRECT_CALLABLE_SCOPE |
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struct sk_buff *tcp6_gro_receive(struct list_head *head, struct sk_buff *skb) |
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{ |
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/* Don't bother verifying checksum if we're going to flush anyway. */ |
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if (!NAPI_GRO_CB(skb)->flush && |
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skb_gro_checksum_validate(skb, IPPROTO_TCP, |
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ip6_gro_compute_pseudo)) { |
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NAPI_GRO_CB(skb)->flush = 1; |
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return NULL; |
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} |
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return tcp_gro_receive(head, skb); |
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} |
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INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int thoff) |
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{ |
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const struct ipv6hdr *iph = ipv6_hdr(skb); |
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struct tcphdr *th = tcp_hdr(skb); |
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th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr, |
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&iph->daddr, 0); |
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skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6; |
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return tcp_gro_complete(skb); |
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} |
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static struct sk_buff *tcp6_gso_segment(struct sk_buff *skb, |
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netdev_features_t features) |
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{ |
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struct tcphdr *th; |
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if (!(skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)) |
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return ERR_PTR(-EINVAL); |
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if (!pskb_may_pull(skb, sizeof(*th))) |
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return ERR_PTR(-EINVAL); |
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if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
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const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
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struct tcphdr *th = tcp_hdr(skb); |
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/* Set up pseudo header, usually expect stack to have done |
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* this. |
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*/ |
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th->check = 0; |
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skb->ip_summed = CHECKSUM_PARTIAL; |
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__tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr); |
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} |
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return tcp_gso_segment(skb, features); |
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} |
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static const struct net_offload tcpv6_offload = { |
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.callbacks = { |
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.gso_segment = tcp6_gso_segment, |
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.gro_receive = tcp6_gro_receive, |
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.gro_complete = tcp6_gro_complete, |
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}, |
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}; |
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int __init tcpv6_offload_init(void) |
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{ |
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return inet6_add_offload(&tcpv6_offload, IPPROTO_TCP); |
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}
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