projects / GitHub / mt8127 / android_kernel_alcatel_ttab.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 | ||
| 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 = { | |
| f191a1d1 VY |
84 | .callbacks = { |
| 85 | .gso_send_check = tcp_v6_gso_send_check, | |
| 86 | .gso_segment = tcp_tso_segment, | |
| 87 | .gro_receive = tcp6_gro_receive, | |
| 88 | .gro_complete = tcp6_gro_complete, | |
| 89 | }, | |
| 8663e02a VY |
90 | }; |
| 91 | ||
| 92 | int __init tcpv6_offload_init(void) | |
| 93 | { | |
| 94 | return inet6_add_offload(&tcpv6_offload, IPPROTO_TCP); | |
| 95 | } |