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, 50 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/080-wireguard-0096-wireguard-receive-use-tunnel-helpers-for-decapsulati.patch b/target/linux/generic/backport-5.4/080-wireguard-0096-wireguard-receive-use-tunnel-helpers-for-decapsulati.patch
new file mode 100644
index 0000000000..a72358c302
--- /dev/null
+++ b/target/linux/generic/backport-5.4/080-wireguard-0096-wireguard-receive-use-tunnel-helpers-for-decapsulati.patch
@@ -0,0 +1,50 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= <toke@redhat.com>
+Date: Wed, 29 Apr 2020 14:59:22 -0600
+Subject: [PATCH] wireguard: receive: use tunnel helpers for decapsulating ECN
+ markings
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+commit eebabcb26ea1e3295704477c6cd4e772c96a9559 upstream.
+
+WireGuard currently only propagates ECN markings on tunnel decap according
+to the old RFC3168 specification. However, the spec has since been updated
+in RFC6040 to recommend slightly different decapsulation semantics. This
+was implemented in the kernel as a set of common helpers for ECN
+decapsulation, so let's just switch over WireGuard to using those, so it
+can benefit from this enhancement and any future tweaks. We do not drop
+packets with invalid ECN marking combinations, because WireGuard is
+frequently used to work around broken ISPs, which could be doing that.
+
+Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
+Reported-by: Olivier Tilmans <olivier.tilmans@nokia-bell-labs.com>
+Cc: Dave Taht <dave.taht@gmail.com>
+Cc: Rodney W. Grimes <ietf@gndrsh.dnsmgr.net>
+Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
+Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+---
+ drivers/net/wireguard/receive.c | 6 ++----
+ 1 file changed, 2 insertions(+), 4 deletions(-)
+
+--- a/drivers/net/wireguard/receive.c
++++ b/drivers/net/wireguard/receive.c
+@@ -393,13 +393,11 @@ static void wg_packet_consume_data_done(
+ 		len = ntohs(ip_hdr(skb)->tot_len);
+ 		if (unlikely(len < sizeof(struct iphdr)))
+ 			goto dishonest_packet_size;
+-		if (INET_ECN_is_ce(PACKET_CB(skb)->ds))
+-			IP_ECN_set_ce(ip_hdr(skb));
++		INET_ECN_decapsulate(skb, PACKET_CB(skb)->ds, ip_hdr(skb)->tos);
+ 	} else if (skb->protocol == htons(ETH_P_IPV6)) {
+ 		len = ntohs(ipv6_hdr(skb)->payload_len) +
+ 		      sizeof(struct ipv6hdr);
+-		if (INET_ECN_is_ce(PACKET_CB(skb)->ds))
+-			IP6_ECN_set_ce(skb, ipv6_hdr(skb));
++		INET_ECN_decapsulate(skb, PACKET_CB(skb)->ds, ipv6_get_dsfield(ipv6_hdr(skb)));
+ 	} else {
+ 		goto dishonest_packet_type;
+ 	}