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, 64 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/080-wireguard-0085-wireguard-device-use-icmp_ndo_send-helper.patch b/target/linux/generic/backport-5.4/080-wireguard-0085-wireguard-device-use-icmp_ndo_send-helper.patch
new file mode 100644
index 0000000000..321db189e1
--- /dev/null
+++ b/target/linux/generic/backport-5.4/080-wireguard-0085-wireguard-device-use-icmp_ndo_send-helper.patch
@@ -0,0 +1,64 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: "Jason A. Donenfeld" <Jason@zx2c4.com>
+Date: Tue, 11 Feb 2020 20:47:08 +0100
+Subject: [PATCH] wireguard: device: use icmp_ndo_send helper
+
+commit a12d7f3cbdc72c7625881c8dc2660fc2c979fdf2 upstream.
+
+Because wireguard is calling icmp from network device context, it should
+use the ndo helper so that the rate limiting applies correctly.  This
+commit adds a small test to the wireguard test suite to ensure that the
+new functions continue doing the right thing in the context of
+wireguard. It does this by setting up a condition that will definately
+evoke an icmp error message from the driver, but along a nat'd path.
+
+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/device.c             |  4 ++--
+ tools/testing/selftests/wireguard/netns.sh | 11 +++++++++++
+ 2 files changed, 13 insertions(+), 2 deletions(-)
+
+--- a/drivers/net/wireguard/device.c
++++ b/drivers/net/wireguard/device.c
+@@ -203,9 +203,9 @@ err_peer:
+ err:
+ 	++dev->stats.tx_errors;
+ 	if (skb->protocol == htons(ETH_P_IP))
+-		icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
++		icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
+ 	else if (skb->protocol == htons(ETH_P_IPV6))
+-		icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
++		icmpv6_ndo_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
+ 	kfree_skb(skb);
+ 	return ret;
+ }
+--- a/tools/testing/selftests/wireguard/netns.sh
++++ b/tools/testing/selftests/wireguard/netns.sh
+@@ -24,6 +24,7 @@
+ set -e
+ 
+ exec 3>&1
++export LANG=C
+ export WG_HIDE_KEYS=never
+ netns0="wg-test-$$-0"
+ netns1="wg-test-$$-1"
+@@ -297,7 +298,17 @@ ip1 -4 rule add table main suppress_pref
+ n1 ping -W 1 -c 100 -f 192.168.99.7
+ n1 ping -W 1 -c 100 -f abab::1111
+ 
++# Have ns2 NAT into wg0 packets from ns0, but return an icmp error along the right route.
++n2 iptables -t nat -A POSTROUTING -s 10.0.0.0/24 -d 192.168.241.0/24 -j SNAT --to 192.168.241.2
++n0 iptables -t filter -A INPUT \! -s 10.0.0.0/24 -i vethrs -j DROP # Manual rpfilter just to be explicit.
++n2 bash -c 'printf 1 > /proc/sys/net/ipv4/ip_forward'
++ip0 -4 route add 192.168.241.1 via 10.0.0.100
++n2 wg set wg0 peer "$pub1" remove
++[[ $(! n0 ping -W 1 -c 1 192.168.241.1 || false) == *"From 10.0.0.100 icmp_seq=1 Destination Host Unreachable"* ]]
++
+ n0 iptables -t nat -F
++n0 iptables -t filter -F
++n2 iptables -t nat -F
+ ip0 link del vethrc
+ ip0 link del vethrs
+ ip1 link del wg0