Line data    Source code

       1             : // SPDX-License-Identifier: GPL-2.0-or-later
       2             : /*
       3             :  *      IPV6 GSO/GRO offload support
       4             :  *      Linux INET6 implementation
       5             :  *
       6             :  *      TCPv6 GSO/GRO support
       7             :  */
       8             : #include <linux/indirect_call_wrapper.h>
       9             : #include <linux/skbuff.h>
      10             : #include <net/protocol.h>
      11             : #include <net/tcp.h>
      12             : #include <net/ip6_checksum.h>
      13             : #include "ip6_offload.h"
      14             : 
      15             : INDIRECT_CALLABLE_SCOPE
      16           0 : struct sk_buff *tcp6_gro_receive(struct list_head *head, struct sk_buff *skb)
      17             : {
      18             :         /* Don't bother verifying checksum if we're going to flush anyway. */
      19           0 :         if (!NAPI_GRO_CB(skb)->flush &&
      20           0 :             skb_gro_checksum_validate(skb, IPPROTO_TCP,
      21             :                                       ip6_gro_compute_pseudo)) {
      22           0 :                 NAPI_GRO_CB(skb)->flush = 1;
      23           0 :                 return NULL;
      24             :         }
      25             : 
      26           0 :         return tcp_gro_receive(head, skb);
      27             : }
      28             : 
      29           0 : INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int thoff)
      30             : {
      31           0 :         const struct ipv6hdr *iph = ipv6_hdr(skb);
      32           0 :         struct tcphdr *th = tcp_hdr(skb);
      33             : 
      34           0 :         th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr,
      35             :                                   &iph->daddr, 0);
      36           0 :         skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;
      37             : 
      38           0 :         return tcp_gro_complete(skb);
      39             : }
      40             : 
      41           0 : static struct sk_buff *tcp6_gso_segment(struct sk_buff *skb,
      42             :                                         netdev_features_t features)
      43             : {
      44           0 :         struct tcphdr *th;
      45             : 
      46           0 :         if (!(skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6))
      47           0 :                 return ERR_PTR(-EINVAL);
      48             : 
      49           0 :         if (!pskb_may_pull(skb, sizeof(*th)))
      50           0 :                 return ERR_PTR(-EINVAL);
      51             : 
      52           0 :         if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
      53           0 :                 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
      54           0 :                 struct tcphdr *th = tcp_hdr(skb);
      55             : 
      56             :                 /* Set up pseudo header, usually expect stack to have done
      57             :                  * this.
      58             :                  */
      59             : 
      60           0 :                 th->check = 0;
      61           0 :                 skb->ip_summed = CHECKSUM_PARTIAL;
      62           0 :                 __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
      63             :         }
      64             : 
      65           0 :         return tcp_gso_segment(skb, features);
      66             : }
      67             : static const struct net_offload tcpv6_offload = {
      68             :         .callbacks = {
      69             :                 .gso_segment    =       tcp6_gso_segment,
      70             :                 .gro_receive    =       tcp6_gro_receive,
      71             :                 .gro_complete   =       tcp6_gro_complete,
      72             :         },
      73             : };
      74             : 
      75           1 : int __init tcpv6_offload_init(void)
      76             : {
      77           1 :         return inet6_add_offload(&tcpv6_offload, IPPROTO_TCP);
      78             : }