cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tcpv6_offload.c (1956B)

      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/gro.h>
     11#include <net/protocol.h>
     12#include <net/tcp.h>
     13#include <net/ip6_checksum.h>
     14#include "ip6_offload.h"
     15
     16INDIRECT_CALLABLE_SCOPE
     17struct sk_buff *tcp6_gro_receive(struct list_head *head, struct sk_buff *skb)
     18{
     19	/* Don't bother verifying checksum if we're going to flush anyway. */
     20	if (!NAPI_GRO_CB(skb)->flush &&
     21	    skb_gro_checksum_validate(skb, IPPROTO_TCP,
     22				      ip6_gro_compute_pseudo)) {
     23		NAPI_GRO_CB(skb)->flush = 1;
     24		return NULL;
     25	}
     26
     27	return tcp_gro_receive(head, skb);
     28}
     29
     30INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int thoff)
     31{
     32	const struct ipv6hdr *iph = ipv6_hdr(skb);
     33	struct tcphdr *th = tcp_hdr(skb);
     34
     35	th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr,
     36				  &iph->daddr, 0);
     37	skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;
     38
     39	return tcp_gro_complete(skb);
     40}
     41
     42static struct sk_buff *tcp6_gso_segment(struct sk_buff *skb,
     43					netdev_features_t features)
     44{
     45	struct tcphdr *th;
     46
     47	if (!(skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6))
     48		return ERR_PTR(-EINVAL);
     49
     50	if (!pskb_may_pull(skb, sizeof(*th)))
     51		return ERR_PTR(-EINVAL);
     52
     53	if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
     54		const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
     55		struct tcphdr *th = tcp_hdr(skb);
     56
     57		/* Set up pseudo header, usually expect stack to have done
     58		 * this.
     59		 */
     60
     61		th->check = 0;
     62		skb->ip_summed = CHECKSUM_PARTIAL;
     63		__tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
     64	}
     65
     66	return tcp_gso_segment(skb, features);
     67}
     68static const struct net_offload tcpv6_offload = {
     69	.callbacks = {
     70		.gso_segment	=	tcp6_gso_segment,
     71		.gro_receive	=	tcp6_gro_receive,
     72		.gro_complete	=	tcp6_gro_complete,
     73	},
     74};
     75
     76int __init tcpv6_offload_init(void)
     77{
     78	return inet6_add_offload(&tcpv6_offload, IPPROTO_TCP);
     79}