-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
ipv6: Separate tcp offload functionality
Pull TCPv6 offload functionality into its won file in preparation for moving it out of the module. Signed-off-by: Vlad Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
- Loading branch information
Vlad Yasevich
authored and
David S. Miller
committed
Nov 15, 2012
1 parent
d1da932
commit 8663e02
Showing
5 changed files
with
141 additions
and
110 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| /* | ||
| * IPV6 GSO/GRO offload support | ||
| * Linux INET6 implementation | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License | ||
| * as published by the Free Software Foundation; either version | ||
| * 2 of the License, or (at your option) any later version. | ||
| * | ||
| * TCPv6 GSO/GRO support | ||
| */ | ||
| #include <linux/skbuff.h> | ||
| #include <net/protocol.h> | ||
| #include <net/tcp.h> | ||
| #include <net/ip6_checksum.h> | ||
| #include "ip6_offload.h" | ||
|
|
||
| static int tcp_v6_gso_send_check(struct sk_buff *skb) | ||
| { | ||
| const struct ipv6hdr *ipv6h; | ||
| struct tcphdr *th; | ||
|
|
||
| if (!pskb_may_pull(skb, sizeof(*th))) | ||
| return -EINVAL; | ||
|
|
||
| ipv6h = ipv6_hdr(skb); | ||
| th = tcp_hdr(skb); | ||
|
|
||
| th->check = 0; | ||
| skb->ip_summed = CHECKSUM_PARTIAL; | ||
| __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr); | ||
| return 0; | ||
| } | ||
|
|
||
| static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, | ||
| struct sk_buff *skb) | ||
| { | ||
| const struct ipv6hdr *iph = skb_gro_network_header(skb); | ||
| __wsum wsum; | ||
| __sum16 sum; | ||
|
|
||
| switch (skb->ip_summed) { | ||
| case CHECKSUM_COMPLETE: | ||
| if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, | ||
| skb->csum)) { | ||
| skb->ip_summed = CHECKSUM_UNNECESSARY; | ||
| break; | ||
| } | ||
| flush: | ||
| NAPI_GRO_CB(skb)->flush = 1; | ||
| return NULL; | ||
|
|
||
| case CHECKSUM_NONE: | ||
| wsum = ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr, | ||
| skb_gro_len(skb), | ||
| IPPROTO_TCP, 0)); | ||
| sum = csum_fold(skb_checksum(skb, | ||
| skb_gro_offset(skb), | ||
| skb_gro_len(skb), | ||
| wsum)); | ||
| if (sum) | ||
| goto flush; | ||
|
|
||
| skb->ip_summed = CHECKSUM_UNNECESSARY; | ||
| break; | ||
| } | ||
|
|
||
| return tcp_gro_receive(head, skb); | ||
| } | ||
|
|
||
| static int tcp6_gro_complete(struct sk_buff *skb) | ||
| { | ||
| const struct ipv6hdr *iph = ipv6_hdr(skb); | ||
| struct tcphdr *th = tcp_hdr(skb); | ||
|
|
||
| th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), | ||
| &iph->saddr, &iph->daddr, 0); | ||
| skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | ||
|
|
||
| return tcp_gro_complete(skb); | ||
| } | ||
|
|
||
| static const struct net_offload tcpv6_offload = { | ||
| .gso_send_check = tcp_v6_gso_send_check, | ||
| .gso_segment = tcp_tso_segment, | ||
| .gro_receive = tcp6_gro_receive, | ||
| .gro_complete = tcp6_gro_complete, | ||
| }; | ||
|
|
||
| int __init tcpv6_offload_init(void) | ||
| { | ||
| return inet6_add_offload(&tcpv6_offload, IPPROTO_TCP); | ||
| } | ||
|
|
||
| void tcpv6_offload_cleanup(void) | ||
| { | ||
| inet6_del_offload(&tcpv6_offload, IPPROTO_TCP); | ||
| } |