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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; | |
40 | __sum16 sum; | |
41 | ||
42 | switch (skb->ip_summed) { | |
43 | case CHECKSUM_COMPLETE: | |
44 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, | |
45 | skb->csum)) { | |
46 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
47 | break; | |
48 | } | |
49 | flush: | |
50 | NAPI_GRO_CB(skb)->flush = 1; | |
51 | return NULL; | |
52 | ||
53 | case CHECKSUM_NONE: | |
54 | wsum = ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr, | |
55 | skb_gro_len(skb), | |
56 | IPPROTO_TCP, 0)); | |
57 | sum = csum_fold(skb_checksum(skb, | |
58 | skb_gro_offset(skb), | |
59 | skb_gro_len(skb), | |
60 | wsum)); | |
61 | if (sum) | |
62 | goto flush; | |
63 | ||
64 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
65 | break; | |
66 | } | |
67 | ||
68 | return tcp_gro_receive(head, skb); | |
69 | } | |
70 | ||
71 | static int tcp6_gro_complete(struct sk_buff *skb) | |
72 | { | |
73 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
74 | struct tcphdr *th = tcp_hdr(skb); | |
75 | ||
76 | th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), | |
77 | &iph->saddr, &iph->daddr, 0); | |
78 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
79 | ||
80 | return tcp_gro_complete(skb); | |
81 | } | |
82 | ||
83 | static const struct net_offload tcpv6_offload = { | |
84 | .gso_send_check = tcp_v6_gso_send_check, | |
85 | .gso_segment = tcp_tso_segment, | |
86 | .gro_receive = tcp6_gro_receive, | |
87 | .gro_complete = tcp6_gro_complete, | |
88 | }; | |
89 | ||
90 | int __init tcpv6_offload_init(void) | |
91 | { | |
92 | return inet6_add_offload(&tcpv6_offload, IPPROTO_TCP); | |
93 | } | |
94 | ||
95 | void tcpv6_offload_cleanup(void) | |
96 | { | |
97 | inet6_del_offload(&tcpv6_offload, IPPROTO_TCP); | |
98 | } |