blob: 0d78132ff18aa018fa4e9918dbfb0dd57f95147a [file] [log] [blame]
Vlad Yasevich8663e022012-11-15 08:49:17 +00001/*
2 * IPV6 GSO/GRO offload support
3 * Linux INET6 implementation
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
9 *
10 * TCPv6 GSO/GRO support
11 */
12#include <linux/skbuff.h>
13#include <net/protocol.h>
14#include <net/tcp.h>
15#include <net/ip6_checksum.h>
16#include "ip6_offload.h"
17
18static int tcp_v6_gso_send_check(struct sk_buff *skb)
19{
20 const struct ipv6hdr *ipv6h;
21 struct tcphdr *th;
22
23 if (!pskb_may_pull(skb, sizeof(*th)))
24 return -EINVAL;
25
26 ipv6h = ipv6_hdr(skb);
27 th = tcp_hdr(skb);
28
29 th->check = 0;
30 skb->ip_summed = CHECKSUM_PARTIAL;
31 __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
32 return 0;
33}
34
35static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
36 struct sk_buff *skb)
37{
38 const struct ipv6hdr *iph = skb_gro_network_header(skb);
39 __wsum wsum;
Vlad Yasevich8663e022012-11-15 08:49:17 +000040
Herbert Xucc5c00b2013-11-22 10:31:29 +080041 /* Don't bother verifying checksum if we're going to flush anyway. */
42 if (NAPI_GRO_CB(skb)->flush)
43 goto skip_csum;
44
Herbert Xub8ee93b2013-11-22 10:32:11 +080045 wsum = skb->csum;
46
Vlad Yasevich8663e022012-11-15 08:49:17 +000047 switch (skb->ip_summed) {
Herbert Xub8ee93b2013-11-22 10:32:11 +080048 case CHECKSUM_NONE:
49 wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb),
50 wsum);
51
52 /* fall through */
53
Vlad Yasevich8663e022012-11-15 08:49:17 +000054 case CHECKSUM_COMPLETE:
55 if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr,
Herbert Xub8ee93b2013-11-22 10:32:11 +080056 wsum)) {
Vlad Yasevich8663e022012-11-15 08:49:17 +000057 skb->ip_summed = CHECKSUM_UNNECESSARY;
58 break;
59 }
Herbert Xub8ee93b2013-11-22 10:32:11 +080060
Vlad Yasevich8663e022012-11-15 08:49:17 +000061 NAPI_GRO_CB(skb)->flush = 1;
62 return NULL;
Vlad Yasevich8663e022012-11-15 08:49:17 +000063 }
64
Herbert Xucc5c00b2013-11-22 10:31:29 +080065skip_csum:
Vlad Yasevich8663e022012-11-15 08:49:17 +000066 return tcp_gro_receive(head, skb);
67}
68
Jerry Chu299603e82013-12-11 20:53:45 -080069static int tcp6_gro_complete(struct sk_buff *skb, int thoff)
Vlad Yasevich8663e022012-11-15 08:49:17 +000070{
71 const struct ipv6hdr *iph = ipv6_hdr(skb);
72 struct tcphdr *th = tcp_hdr(skb);
73
Jerry Chu299603e82013-12-11 20:53:45 -080074 th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr,
75 &iph->daddr, 0);
Vlad Yasevich8663e022012-11-15 08:49:17 +000076 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
77
78 return tcp_gro_complete(skb);
79}
80
81static const struct net_offload tcpv6_offload = {
Vlad Yasevichf191a1d2012-11-15 08:49:23 +000082 .callbacks = {
83 .gso_send_check = tcp_v6_gso_send_check,
Eric Dumazet28be6e02013-10-18 10:36:17 -070084 .gso_segment = tcp_gso_segment,
Vlad Yasevichf191a1d2012-11-15 08:49:23 +000085 .gro_receive = tcp6_gro_receive,
86 .gro_complete = tcp6_gro_complete,
87 },
Vlad Yasevich8663e022012-11-15 08:49:17 +000088};
89
90int __init tcpv6_offload_init(void)
91{
92 return inet6_add_offload(&tcpv6_offload, IPPROTO_TCP);
93}