Merge tag 'net-6.15-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Pull networking fixes from Paolo Abeni:
 "Including fixes from CAN, WiFi and netfilter.

  We have still a comple of regressions open due to the recent
  drivers locking refactor. The patches are in-flight, but not
  ready yet.

  Current release - regressions:

   - core: lock netdevices during dev_shutdown

   - sch_htb: make htb_deactivate() idempotent

   - eth: virtio-net: don't re-enable refill work too early

  Current release - new code bugs:

   - eth: icssg-prueth: fix kernel panic during concurrent Tx queue
     access

  Previous releases - regressions:

   - gre: fix again IPv6 link-local address generation.

   - eth: b53: fix learning on VLAN unaware bridges

  Previous releases - always broken:

   - wifi: fix out-of-bounds access during multi-link element
     defragmentation

   - can:
       - initialize spin lock on device probe
       - fix order of unregistration calls

   - openvswitch: fix unsafe attribute parsing in output_userspace()

   - eth:
       - virtio-net: fix total qstat values
       - mtk_eth_soc: reset all TX queues on DMA free
       - fbnic: firmware IPC mailbox fixes"

* tag 'net-6.15-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (55 commits)
  virtio-net: fix total qstat values
  net: export a helper for adding up queue stats
  fbnic: Do not allow mailbox to toggle to ready outside fbnic_mbx_poll_tx_ready
  fbnic: Pull fbnic_fw_xmit_cap_msg use out of interrupt context
  fbnic: Improve responsiveness of fbnic_mbx_poll_tx_ready
  fbnic: Cleanup handling of completions
  fbnic: Actually flush_tx instead of stalling out
  fbnic: Add additional handling of IRQs
  fbnic: Gate AXI read/write enabling on FW mailbox
  fbnic: Fix initialization of mailbox descriptor rings
  net: dsa: b53: do not set learning and unicast/multicast on up
  net: dsa: b53: fix learning on VLAN unaware bridges
  net: dsa: b53: fix toggling vlan_filtering
  net: dsa: b53: do not program vlans when vlan filtering is off
  net: dsa: b53: do not allow to configure VLAN 0
  net: dsa: b53: always rejoin default untagged VLAN on bridge leave
  net: dsa: b53: fix VLAN ID for untagged vlan on bridge leave
  net: dsa: b53: fix flushing old pvid VLAN on pvid change
  net: dsa: b53: fix clearing PVID of a port
  net: dsa: b53: keep CPU port always tagged again
  ...

1 files changed, 9 insertions, 6 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 9ba83f0c9928..c6b22170dc49 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3214,16 +3214,13 @@ static void add_v4_addrs(struct inet6_dev *idev)
 	struct in6_addr addr;
 	struct net_device *dev;
 	struct net *net = dev_net(idev->dev);
-	int scope, plen, offset = 0;
+	int scope, plen;
 	u32 pflags = 0;
 
 	ASSERT_RTNL();
 
 	memset(&addr, 0, sizeof(struct in6_addr));
-	/* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
-	if (idev->dev->addr_len == sizeof(struct in6_addr))
-		offset = sizeof(struct in6_addr) - 4;
-	memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
+	memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
 
 	if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
 		scope = IPV6_ADDR_COMPATv4;
@@ -3534,7 +3531,13 @@ static void addrconf_gre_config(struct net_device *dev)
 		return;
 	}
 
-	if (dev->type == ARPHRD_ETHER) {
+	/* Generate the IPv6 link-local address using addrconf_addr_gen(),
+	 * unless we have an IPv4 GRE device not bound to an IP address and
+	 * which is in EUI64 mode (as __ipv6_isatap_ifid() would fail in this
+	 * case). Such devices fall back to add_v4_addrs() instead.
+	 */
+	if (!(dev->type == ARPHRD_IPGRE && *(__be32 *)dev->dev_addr == 0 &&
+	      idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)) {
 		addrconf_addr_gen(idev, true);
 		return;
 	}