projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 8663e02a VY |
18 | static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, |
| 19 | struct sk_buff *skb) | |
| 20 | { | |
| cc5c00bb | 21 | /* Don't bother verifying checksum if we're going to flush anyway. */ |
| 149d0774 TH |
22 | if (!NAPI_GRO_CB(skb)->flush && |
| 23 | skb_gro_checksum_validate(skb, IPPROTO_TCP, | |
| 24 | ip6_gro_compute_pseudo)) { | |
| 8663e02a VY |
25 | NAPI_GRO_CB(skb)->flush = 1; |
| 26 | return NULL; | |
| 8663e02a VY |
27 | } |
| 28 | ||
| 29 | return tcp_gro_receive(head, skb); | |
| 30 | } | |
| 31 | ||
| 299603e8 | 32 | static int tcp6_gro_complete(struct sk_buff *skb, int thoff) |
| 8663e02a VY |
33 | { |
| 34 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
| 35 | struct tcphdr *th = tcp_hdr(skb); | |
| 36 | ||
| 299603e8 JC |
37 | th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr, |
| 38 | &iph->daddr, 0); | |
| c3caf119 | 39 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6; |
| 8663e02a VY |
40 | |
| 41 | return tcp_gro_complete(skb); | |
| 42 | } | |
| 43 | ||
| 74abc20c ED |
44 | static struct sk_buff *tcp6_gso_segment(struct sk_buff *skb, |
| 45 | netdev_features_t features) | |
| d020f8f7 TH |
46 | { |
| 47 | struct tcphdr *th; | |
| 48 | ||
| 49 | if (!pskb_may_pull(skb, sizeof(*th))) | |
| 50 | return ERR_PTR(-EINVAL); | |
| 51 | ||
| 52 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { | |
| 53 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
| 54 | struct tcphdr *th = tcp_hdr(skb); | |
| 55 | ||
| 56 | /* Set up pseudo header, usually expect stack to have done | |
| 57 | * this. | |
| 58 | */ | |
| 59 | ||
| 60 | th->check = 0; | |
| 61 | skb->ip_summed = CHECKSUM_PARTIAL; | |
| 62 | __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr); | |
| 63 | } | |
| 64 | ||
| 65 | return tcp_gso_segment(skb, features); | |
| 66 | } | |
| 8663e02a | 67 | static const struct net_offload tcpv6_offload = { |
| f191a1d1 | 68 | .callbacks = { |
| d020f8f7 | 69 | .gso_segment = tcp6_gso_segment, |
| f191a1d1 VY |
70 | .gro_receive = tcp6_gro_receive, |
| 71 | .gro_complete = tcp6_gro_complete, | |
| 72 | }, | |
| 8663e02a VY |
73 | }; |
| 74 | ||
| 75 | int __init tcpv6_offload_init(void) | |
| 76 | { | |
| 77 | return inet6_add_offload(&tcpv6_offload, IPPROTO_TCP); | |
| 78 | } |