Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *	IPV6 GSO/GRO offload support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *	Linux INET6 implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *      TCPv6 GSO/GRO support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/indirect_call_wrapper.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <net/tcp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <net/ip6_checksum.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "ip6_offload.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) INDIRECT_CALLABLE_SCOPE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) struct sk_buff *tcp6_gro_receive(struct list_head *head, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	/* Don't bother verifying checksum if we're going to flush anyway. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	if (!NAPI_GRO_CB(skb)->flush &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	    skb_gro_checksum_validate(skb, IPPROTO_TCP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 				      ip6_gro_compute_pseudo)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 		NAPI_GRO_CB(skb)->flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	return tcp_gro_receive(head, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int thoff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	const struct ipv6hdr *iph = ipv6_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	struct tcphdr *th = tcp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 				  &iph->daddr, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	return tcp_gro_complete(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static struct sk_buff *tcp6_gso_segment(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 					netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	struct tcphdr *th;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	if (!(skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	if (!pskb_may_pull(skb, sizeof(*th)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		struct tcphdr *th = tcp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		/* Set up pseudo header, usually expect stack to have done
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		 * this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 		th->check = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 		skb->ip_summed = CHECKSUM_PARTIAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 		__tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	return tcp_gso_segment(skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static const struct net_offload tcpv6_offload = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	.callbacks = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 		.gso_segment	=	tcp6_gso_segment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 		.gro_receive	=	tcp6_gro_receive,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 		.gro_complete	=	tcp6_gro_complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) int __init tcpv6_offload_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	return inet6_add_offload(&tcpv6_offload, IPPROTO_TCP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }