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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* IPV6 GSO/GRO offload support
* Linux INET6 implementation
*
* TCPv6 GSO/GRO support
*/
#include <linux/indirect_call_wrapper.h>
#include <linux/skbuff.h>
#include <net/inet6_hashtables.h>
#include <net/gro.h>
#include <net/protocol.h>
#include <net/tcp.h>
#include <net/ip6_checksum.h>
#include "ip6_offload.h"
static void tcp6_check_fraglist_gro(struct list_head *head, struct sk_buff *skb,
struct tcphdr *th)
{
#if IS_ENABLED(CONFIG_IPV6)
const struct ipv6hdr *hdr;
struct sk_buff *p;
struct sock *sk;
struct net *net;
int iif, sdif;
if (likely(!(skb->dev->features & NETIF_F_GRO_FRAGLIST)))
return;
p = tcp_gro_lookup(head, th);
if (p) {
NAPI_GRO_CB(skb)->is_flist = NAPI_GRO_CB(p)->is_flist;
return;
}
inet6_get_iif_sdif(skb, &iif, &sdif);
hdr = skb_gro_network_header(skb);
net = dev_net(skb->dev);
sk = __inet6_lookup_established(net, net->ipv4.tcp_death_row.hashinfo,
&hdr->saddr, th->source,
&hdr->daddr, ntohs(th->dest),
iif, sdif);
NAPI_GRO_CB(skb)->is_flist = !sk;
if (sk)
sock_put(sk);
#endif /* IS_ENABLED(CONFIG_IPV6) */
}
INDIRECT_CALLABLE_SCOPE
struct sk_buff *tcp6_gro_receive(struct list_head *head, struct sk_buff *skb)
{
struct tcphdr *th;
/* Don't bother verifying checksum if we're going to flush anyway. */
if (!NAPI_GRO_CB(skb)->flush &&
skb_gro_checksum_validate(skb, IPPROTO_TCP,
ip6_gro_compute_pseudo))
goto flush;
th = tcp_gro_pull_header(skb);
if (!th)
goto flush;
tcp6_check_fraglist_gro(head, skb, th);
return tcp_gro_receive(head, skb, th);
flush:
NAPI_GRO_CB(skb)->flush = 1;
return NULL;
}
INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int thoff)
{
const struct ipv6hdr *iph = ipv6_hdr(skb);
struct tcphdr *th = tcp_hdr(skb);
if (unlikely(NAPI_GRO_CB(skb)->is_flist)) {
skb_shinfo(skb)->gso_type |= SKB_GSO_FRAGLIST | SKB_GSO_TCPV6;
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
__skb_incr_checksum_unnecessary(skb);
return 0;
}
th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr,
&iph->daddr, 0);
skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;
tcp_gro_complete(skb);
return 0;
}
static void __tcpv6_gso_segment_csum(struct sk_buff *seg,
__be16 *oldport, __be16 newport)
{
struct tcphdr *th;
if (*oldport == newport)
return;
th = tcp_hdr(seg);
inet_proto_csum_replace2(&th->check, seg, *oldport, newport, false);
*oldport = newport;
}
static struct sk_buff *__tcpv6_gso_segment_list_csum(struct sk_buff *segs)
{
const struct tcphdr *th;
const struct ipv6hdr *iph;
struct sk_buff *seg;
struct tcphdr *th2;
struct ipv6hdr *iph2;
seg = segs;
th = tcp_hdr(seg);
iph = ipv6_hdr(seg);
th2 = tcp_hdr(seg->next);
iph2 = ipv6_hdr(seg->next);
if (!(*(const u32 *)&th->source ^ *(const u32 *)&th2->source) &&
ipv6_addr_equal(&iph->saddr, &iph2->saddr) &&
ipv6_addr_equal(&iph->daddr, &iph2->daddr))
return segs;
while ((seg = seg->next)) {
th2 = tcp_hdr(seg);
iph2 = ipv6_hdr(seg);
iph2->saddr = iph->saddr;
iph2->daddr = iph->daddr;
__tcpv6_gso_segment_csum(seg, &th2->source, th->source);
__tcpv6_gso_segment_csum(seg, &th2->dest, th->dest);
}
return segs;
}
static struct sk_buff *__tcp6_gso_segment_list(struct sk_buff *skb,
netdev_features_t features)
{
skb = skb_segment_list(skb, features, skb_mac_header_len(skb));
if (IS_ERR(skb))
return skb;
return __tcpv6_gso_segment_list_csum(skb);
}
static struct sk_buff *tcp6_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
struct tcphdr *th;
if (!(skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6))
return ERR_PTR(-EINVAL);
if (!pskb_may_pull(skb, sizeof(*th)))
return ERR_PTR(-EINVAL);
if (skb_shinfo(skb)->gso_type & SKB_GSO_FRAGLIST)
return __tcp6_gso_segment_list(skb, features);
if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
struct tcphdr *th = tcp_hdr(skb);
/* Set up pseudo header, usually expect stack to have done
* this.
*/
th->check = 0;
skb->ip_summed = CHECKSUM_PARTIAL;
__tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
}
return tcp_gso_segment(skb, features);
}
int __init tcpv6_offload_init(void)
{
net_hotdata.tcpv6_offload = (struct net_offload) {
.callbacks = {
.gso_segment = tcp6_gso_segment,
.gro_receive = tcp6_gro_receive,
.gro_complete = tcp6_gro_complete,
},
};
return inet6_add_offload(&net_hotdata.tcpv6_offload, IPPROTO_TCP);
}
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