kernel-5.4: bump to 5.4.102 and refresh patches

5.4.102 backported a lot of stuff that our WireGuard backport already
did, in addition to other patches we had, so those patches were
removed from that part of the series. In the process other patches were
refreshed or reworked to account for upstream changes.

This commit involved `update_kernel.sh -v -u 5.4`.

Cc: John Audia <graysky@archlinux.us>
Cc: David Bauer <mail@david-bauer.net>
Cc: Petr Štetiar <ynezz@true.cz>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/080-wireguard-0109-net-ip_tunnel-add-header_ops-for-layer-3-devices.patch b/target/linux/generic/backport-5.4/080-wireguard-0109-net-ip_tunnel-add-header_ops-for-layer-3-devices.patch
new file mode 100644
index 0000000000..cfd6b1457c
--- /dev/null
+++ b/target/linux/generic/backport-5.4/080-wireguard-0109-net-ip_tunnel-add-header_ops-for-layer-3-devices.patch
@@ -0,0 +1,58 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: "Jason A. Donenfeld" <Jason@zx2c4.com>
+Date: Mon, 29 Jun 2020 19:06:18 -0600
+Subject: [PATCH] net: ip_tunnel: add header_ops for layer 3 devices
+
+commit 2606aff916854b61234bf85001be9777bab2d5f8 upstream.
+
+Some devices that take straight up layer 3 packets benefit from having a
+shared header_ops so that AF_PACKET sockets can inject packets that are
+recognized. This shared infrastructure will be used by other drivers
+that currently can't inject packets using AF_PACKET. It also exposes the
+parser function, as it is useful in standalone form too.
+
+Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+Acked-by: Willem de Bruijn <willemb@google.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+---
+ include/net/ip_tunnels.h  |  3 +++
+ net/ipv4/ip_tunnel_core.c | 18 ++++++++++++++++++
+ 2 files changed, 21 insertions(+)
+
+--- a/include/net/ip_tunnels.h
++++ b/include/net/ip_tunnels.h
+@@ -289,6 +289,9 @@ int ip_tunnel_newlink(struct net_device
+ 		      struct ip_tunnel_parm *p, __u32 fwmark);
+ void ip_tunnel_setup(struct net_device *dev, unsigned int net_id);
+ 
++extern const struct header_ops ip_tunnel_header_ops;
++__be16 ip_tunnel_parse_protocol(const struct sk_buff *skb);
++
+ struct ip_tunnel_encap_ops {
+ 	size_t (*encap_hlen)(struct ip_tunnel_encap *e);
+ 	int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
+--- a/net/ipv4/ip_tunnel_core.c
++++ b/net/ipv4/ip_tunnel_core.c
+@@ -446,3 +446,21 @@ void ip_tunnel_unneed_metadata(void)
+ 	static_branch_dec(&ip_tunnel_metadata_cnt);
+ }
+ EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
++
++/* Returns either the correct skb->protocol value, or 0 if invalid. */
++__be16 ip_tunnel_parse_protocol(const struct sk_buff *skb)
++{
++	if (skb_network_header(skb) >= skb->head &&
++	    (skb_network_header(skb) + sizeof(struct iphdr)) <= skb_tail_pointer(skb) &&
++	    ip_hdr(skb)->version == 4)
++		return htons(ETH_P_IP);
++	if (skb_network_header(skb) >= skb->head &&
++	    (skb_network_header(skb) + sizeof(struct ipv6hdr)) <= skb_tail_pointer(skb) &&
++	    ipv6_hdr(skb)->version == 6)
++		return htons(ETH_P_IPV6);
++	return 0;
++}
++EXPORT_SYMBOL(ip_tunnel_parse_protocol);
++
++const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol };
++EXPORT_SYMBOL(ip_tunnel_header_ops);