From: Fernando Fernandez Mancera Date: Sat, 23 May 2026 10:38:10 +0000 (+0200) Subject: ipv6: addrconf: fix temp address generation after prefix deprecation X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e20d8922aa8fe441d291364c96c2179a005b79ea;p=thirdparty%2Flinux.git ipv6: addrconf: fix temp address generation after prefix deprecation When a router temporarily deprecates an IPv6 prefix (either by sending a Router Advertisement with Preferred Lifetime = 0 or by letting the lifetime expire) and later restores it, the kernel permanently loses its ability to generate temporary privacy addresses (RFC 8981) for that prefix. This happens because the address worker attempts to generate a replacement temporary address when the current one nears expiration. As the base prefix is deprecated already, the generation fails after marking the temporary address as already having spawned a replacement (ifp->regen_count++). When the router eventually restores the prefix, the temporary address becomes active again. However, once it naturally expires, the address worker sees this temporary address already tried to generate one and skips the regeneration. Fix the issue by resetting the regen_count check of the latest temp address generated for the prefix updated by the incoming RA. Reported-by: Łukasz Stelmach Closes: https://lore.kernel.org/netdev/87340td30q.fsf%25steelman@post.pl/ Suggested-by: Ido Schimmel Signed-off-by: Fernando Fernandez Mancera Reviewed-by: Ido Schimmel Link: https://patch.msgid.link/20260523103811.3790-1-fmancera@suse.de Signed-off-by: Jakub Kicinski --- diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index da0f07e21e3f..d7b03196725f 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -1174,6 +1174,7 @@ ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, ipv6_link_dev_addr(idev, ifa); if (ifa->flags&IFA_F_TEMPORARY) { + /* manage_tempaddrs() relies on addresses being added to the head */ list_add(&ifa->tmp_list, &idev->tempaddr_list); in6_ifa_hold(ifa); } @@ -2602,8 +2603,10 @@ static void manage_tempaddrs(struct inet6_dev *idev, __u32 valid_lft, __u32 prefered_lft, bool create, unsigned long now) { - u32 flags; + u32 orig_prefered_lft = prefered_lft; struct inet6_ifaddr *ift; + bool reset_done = false; + u32 flags; read_lock_bh(&idev->lock); /* update all temporary addresses in the list */ @@ -2638,6 +2641,11 @@ static void manage_tempaddrs(struct inet6_dev *idev, prefered_lft = max_prefered; spin_lock(&ift->lock); + /* the first match is the most recent temp address */ + if (!reset_done && orig_prefered_lft > 0) { + ift->regen_count = 0; + reset_done = true; + } flags = ift->flags; ift->valid_lft = valid_lft; ift->prefered_lft = prefered_lft;