96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/*
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* IPV6 GSO/GRO offload support
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* Linux INET6 implementation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* TCPv6 GSO/GRO support
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*/
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#include <linux/skbuff.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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static int tcp_v6_gso_send_check(struct sk_buff *skb)
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{
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const struct ipv6hdr *ipv6h;
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struct tcphdr *th;
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if (!pskb_may_pull(skb, sizeof(*th)))
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return -EINVAL;
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ipv6h = ipv6_hdr(skb);
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th = tcp_hdr(skb);
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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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return 0;
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}
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static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
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struct sk_buff *skb)
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{
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const struct ipv6hdr *iph = skb_gro_network_header(skb);
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__wsum wsum;
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__sum16 sum;
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switch (skb->ip_summed) {
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case CHECKSUM_COMPLETE:
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if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr,
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skb->csum)) {
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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break;
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}
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flush:
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NAPI_GRO_CB(skb)->flush = 1;
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return NULL;
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case CHECKSUM_NONE:
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wsum = ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr,
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skb_gro_len(skb),
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IPPROTO_TCP, 0));
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sum = csum_fold(skb_checksum(skb,
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skb_gro_offset(skb),
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skb_gro_len(skb),
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wsum));
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if (sum)
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goto flush;
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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break;
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}
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return tcp_gro_receive(head, skb);
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}
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static int tcp6_gro_complete(struct sk_buff *skb)
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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 - skb_transport_offset(skb),
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&iph->saddr, &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 const struct net_offload tcpv6_offload = {
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.callbacks = {
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.gso_send_check = tcp_v6_gso_send_check,
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.gso_segment = tcp_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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