Ubuntu 18.04 kernel 4.15.0-106-generic breaks wireguard-1.0.20200520

[Thilo-Alexander Ginkel]

Hi there,

after updating to the current Ubuntu 18.04 kernel 4.15.0-106-generic
kernel wireguard-dkms no longer compiles with the following build
failure:

DKMS make.log for wireguard-1.0.20200520 for kernel 4.15.0-106-generic (x86_64)
Wed Jun 10 12:32:13 CEST 2020
make: Entering directory '/usr/src/linux-headers-4.15.0-106-generic'
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/main.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/noise.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/device.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/peer.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/timers.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/queueing.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/send.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/receive.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/socket.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/peerlookup.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/allowedips.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/ratelimiter.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/cookie.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/netlink.o
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/crypto/zinc/chacha20/chacha20.o
  PERLASM /var/lib/dkms/wireguard/1.0.20200520/build/crypto/zinc/chacha20/chacha20-x86_64.S
  CC [M]  /var/lib/dkms/wireguard/1.0.20200520/build/crypto/zinc/poly1305/poly1305.o
In file included from <command-line>:0:0:
/var/lib/dkms/wireguard/1.0.20200520/build/socket.c: In function ‘send6’:
/var/lib/dkms/wireguard/1.0.20200520/build/compat/compat.h:102:42:
error: ‘const struct ipv6_stub’ has no member named ‘ipv6_dst_lookup’;
did you mean ‘ipv6_dst_lookup_flow’?
 #define ipv6_dst_lookup_flow(a, b, c, d) ipv6_dst_lookup(a, b, &dst,
c) + (void *)0 ?: dst
                                          ^
/var/lib/dkms/wireguard/1.0.20200520/build/socket.c:139:20: note: in
expansion of macro ‘ipv6_dst_lookup_flow’
   dst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(sock), sock, &fl,
                    ^~~~~~~~~~~~~~~~~~~~
scripts/Makefile.build:330: recipe for target
'/var/lib/dkms/wireguard/1.0.20200520/build/socket.o' failed
make[1]: *** [/var/lib/dkms/wireguard/1.0.20200520/build/socket.o] Error 1
make[1]: *** Waiting for unfinished jobs....
Makefile:1577: recipe for target
'_module_/var/lib/dkms/wireguard/1.0.20200520/build' failed
make: *** [_module_/var/lib/dkms/wireguard/1.0.20200520/build] Error 2
make: Leaving directory '/usr/src/linux-headers-4.15.0-106-generic'

Regards,
Thilo