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Commit | Line | Data |
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8663e02a VY |
1 | /* |
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 | ||
18 | static 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 | ||
35 | static 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; | |
8663e02a | 40 | |
cc5c00bb HX |
41 | /* Don't bother verifying checksum if we're going to flush anyway. */ |
42 | if (NAPI_GRO_CB(skb)->flush) | |
43 | goto skip_csum; | |
44 | ||
4de462ab | 45 | wsum = NAPI_GRO_CB(skb)->csum; |
b8ee93ba | 46 | |
8663e02a | 47 | switch (skb->ip_summed) { |
b8ee93ba HX |
48 | case CHECKSUM_NONE: |
49 | wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), | |
50 | wsum); | |
51 | ||
52 | /* fall through */ | |
53 | ||
8663e02a VY |
54 | case CHECKSUM_COMPLETE: |
55 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, | |
b8ee93ba | 56 | wsum)) { |
8663e02a VY |
57 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
58 | break; | |
59 | } | |
b8ee93ba | 60 | |
8663e02a VY |
61 | NAPI_GRO_CB(skb)->flush = 1; |
62 | return NULL; | |
8663e02a VY |
63 | } |
64 | ||
cc5c00bb | 65 | skip_csum: |
8663e02a VY |
66 | return tcp_gro_receive(head, skb); |
67 | } | |
68 | ||
299603e8 | 69 | static int tcp6_gro_complete(struct sk_buff *skb, int thoff) |
8663e02a VY |
70 | { |
71 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
72 | struct tcphdr *th = tcp_hdr(skb); | |
73 | ||
299603e8 JC |
74 | th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr, |
75 | &iph->daddr, 0); | |
8663e02a VY |
76 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
77 | ||
78 | return tcp_gro_complete(skb); | |
79 | } | |
80 | ||
81 | static const struct net_offload tcpv6_offload = { | |
f191a1d1 VY |
82 | .callbacks = { |
83 | .gso_send_check = tcp_v6_gso_send_check, | |
28be6e07 | 84 | .gso_segment = tcp_gso_segment, |
f191a1d1 VY |
85 | .gro_receive = tcp6_gro_receive, |
86 | .gro_complete = tcp6_gro_complete, | |
87 | }, | |
8663e02a VY |
88 | }; |
89 | ||
90 | int __init tcpv6_offload_init(void) | |
91 | { | |
92 | return inet6_add_offload(&tcpv6_offload, IPPROTO_TCP); | |
93 | } |