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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; |
40 | |
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 | |
45 | wsum = NAPI_GRO_CB(skb)->csum; |
46 | |
47 | switch (skb->ip_summed) { |
48 | case CHECKSUM_NONE: |
49 | wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), |
50 | wsum); |
51 | |
52 | /* fall through */ |
53 | |
54 | case CHECKSUM_COMPLETE: |
55 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, |
56 | wsum)) { |
57 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
58 | break; |
59 | } |
60 | |
61 | NAPI_GRO_CB(skb)->flush = 1; |
62 | return NULL; |
63 | } |
64 | |
65 | skip_csum: |
66 | return tcp_gro_receive(head, skb); |
67 | } |
68 | |
69 | static int tcp6_gro_complete(struct sk_buff *skb, int thoff) |
70 | { |
71 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
72 | struct tcphdr *th = tcp_hdr(skb); |
73 | |
74 | th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr, |
75 | &iph->daddr, 0); |
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 = { |
82 | .callbacks = { |
83 | .gso_send_check = tcp_v6_gso_send_check, |
84 | .gso_segment = tcp_gso_segment, |
85 | .gro_receive = tcp6_gro_receive, |
86 | .gro_complete = tcp6_gro_complete, |
87 | }, |
88 | }; |
89 | |
90 | int __init tcpv6_offload_init(void) |
91 | { |
92 | return inet6_add_offload(&tcpv6_offload, IPPROTO_TCP); |
93 | } |
94 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9