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Revert "gre: Fix IPv6 link-local address generation."

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This reverts commit 183185a18f.

This patch broke net/forwarding/ip6gre_custom_multipath_hash.sh in some
circumstances (https://lore.kernel.org/netdev/Z9RIyKZDNoka53EO@mini-arch/).
Let's revert it while the problem is being investigated.

Fixes: 183185a18f ("gre: Fix IPv6 link-local address generation.")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Link: https://patch.msgid.link/8b1ce738eb15dd841aab9ef888640cab4f6ccfea.1742418408.git.gnault@redhat.com
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Guillaume Nault 2025-03-19 22:26:50 +01:00 • committed by Paolo Abeni
parent 355d940f4d
commit fc486c2d06
1 changed files with 6 additions and 9 deletions
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15
net/ipv6/addrconf.c
View file

@ -3209,13 +3209,16 @@ 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;
int scope, plen, offset = 0;
u32 pflags = 0;
ASSERT_RTNL();
memset(&addr, 0, sizeof(struct in6_addr));
memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
/* 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);
if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
scope = IPV6_ADDR_COMPATv4;
@ -3526,13 +3529,7 @@ static void addrconf_gre_config(struct net_device *dev)
return;
}
/* 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)) {
if (dev->type == ARPHRD_ETHER) {
addrconf_addr_gen(idev, true);
return;
}