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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/net/ipv6/udp_offload.c
..
..
@@ -1,16 +1,13 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  *	IPV6 GSO/GRO offload support
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  *	Linux INET6 implementation
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- *
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- *	This program is free software; you can redistribute it and/or
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- *      modify it under the terms of the GNU General Public License
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- *      as published by the Free Software Foundation; either version
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- *      2 of the License, or (at your option) any later version.
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  *
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6
  *      UDPv6 GSO support
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7
  */
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8
 #include <linux/skbuff.h>
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9
 #include <linux/netdevice.h>
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+#include <linux/indirect_call_wrapper.h>
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 #include <net/protocol.h>
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12
 #include <net/ipv6.h>
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13
 #include <net/udp.h>
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@@ -49,7 +46,7 @@
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 			goto out;
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47
 
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 		if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
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-			return __udp_gso_segment(skb, features);
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+			return __udp_gso_segment(skb, features, true);
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50
 
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 		/* Do software UFO. Complete and fill in the UDP checksum as HW cannot
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 		 * do checksum of UDP packets sent as multiple IP fragments.
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@@ -114,10 +111,22 @@
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 	return segs;
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 }
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113
 
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-static struct sk_buff *udp6_gro_receive(struct list_head *head,
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-					struct sk_buff *skb)
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+static struct sock *udp6_gro_lookup_skb(struct sk_buff *skb, __be16 sport,
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+					__be16 dport)
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+{
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+	const struct ipv6hdr *iph = skb_gro_network_header(skb);
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+
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+	return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
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+				 &iph->daddr, dport, inet6_iif(skb),
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+				 inet6_sdif(skb), &udp_table, NULL);
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+}
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+
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+INDIRECT_CALLABLE_SCOPE
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+struct sk_buff *udp6_gro_receive(struct list_head *head, struct sk_buff *skb)
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 {
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 	struct udphdr *uh = udp_gro_udphdr(skb);
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+	struct sock *sk = NULL;
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+	struct sk_buff *pp;
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130
 
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 	if (unlikely(!uh))
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 		goto flush;
..
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@@ -130,30 +139,50 @@
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139
 						 ip6_gro_compute_pseudo))
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 		goto flush;
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 	else if (uh->check)
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-		skb_gro_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
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+		skb_gro_checksum_try_convert(skb, IPPROTO_UDP,
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 					     ip6_gro_compute_pseudo);
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144
 
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 skip:
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 	NAPI_GRO_CB(skb)->is_ipv6 = 1;
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-	return udp_gro_receive(head, skb, uh, udp6_lib_lookup_skb);
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+	rcu_read_lock();
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+
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+	if (static_branch_unlikely(&udpv6_encap_needed_key))
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+		sk = udp6_gro_lookup_skb(skb, uh->source, uh->dest);
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+
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+	pp = udp_gro_receive(head, skb, uh, sk);
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+	rcu_read_unlock();
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+	return pp;
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155
 
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 flush:
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 	NAPI_GRO_CB(skb)->flush = 1;
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 	return NULL;
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159
 }
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160
 
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-static int udp6_gro_complete(struct sk_buff *skb, int nhoff)
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+INDIRECT_CALLABLE_SCOPE int udp6_gro_complete(struct sk_buff *skb, int nhoff)
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162
 {
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 	const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
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 	struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
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165
 
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-	if (uh->check) {
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-		skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM;
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+	if (NAPI_GRO_CB(skb)->is_flist) {
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+		uh->len = htons(skb->len - nhoff);
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+
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+		skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4);
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+		skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
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+
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+		if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
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+			if (skb->csum_level < SKB_MAX_CSUM_LEVEL)
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+				skb->csum_level++;
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+		} else {
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+			skb->ip_summed = CHECKSUM_UNNECESSARY;
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+			skb->csum_level = 0;
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+		}
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+
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+		return 0;
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+	}
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+
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+	if (uh->check)
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 		uh->check = ~udp_v6_check(skb->len - nhoff, &ipv6h->saddr,
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185
 					  &ipv6h->daddr, 0);
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-	} else {
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-		skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
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-	}
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186
 
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 	return udp_gro_complete(skb, nhoff, udp6_lib_lookup_skb);
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188
 }