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c6b641a4c6
Sing GSO support is now separate, pull it out of the module and make it its own init call. Remove the cleanup functions as they are no longer called. Signed-off-by: Vlad Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
93 lines
2.2 KiB
C
93 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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.gso_send_check = tcp_v6_gso_send_check,
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.gso_segment = tcp_tso_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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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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