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| author | Yuyang Huang <sigefriedhyy@gmail.com> | 2026-08-08 09:56:35 +0900 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2026-08-13 12:30:27 +0200 |
| commit | e8636445b771c0936cf3c2fe3bbdb281b4cf6acf (patch) | |
| tree | d91e41e20de17d97bbe128d261fbffcfad656981 | |
| parent | 352c6732ffb2c5a45a10096bfef13c343484c22f (diff) | |
| download | linux-stable-e8636445b771c0936cf3c2fe3bbdb281b4cf6acf.tar.gz linux-stable-e8636445b771c0936cf3c2fe3bbdb281b4cf6acf.zip | |
ipv6: record the reason for kernel-initiated route deletions
Record why the kernel deletes an IPv6 route on its own:
- RT_DEL_REASON_EXPIRED for routes reaped by the FIB6 garbage
collector after their RTF_EXPIRES lifetime ran out.
- RT_DEL_REASON_RA_WITHDRAWN for default routes, prefix routes and
RFC 4191 route information routes withdrawn by a zero-lifetime
Router Advertisement.
Deleting a default route because its metric changed is not a
withdrawal, so it keeps RT_DEL_REASON_UNSPEC.
Signed-off-by: Yuyang Huang <sigefriedhyy@gmail.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260808005642.26901-4-sigefriedhyy@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
| -rw-r--r-- | net/ipv6/addrconf.c | 3 | ||||
| -rw-r--r-- | net/ipv6/ip6_fib.c | 2 | ||||
| -rw-r--r-- | net/ipv6/ndisc.c | 4 | ||||
| -rw-r--r-- | net/ipv6/route.c | 2 |
4 files changed, 7 insertions, 4 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index f6fa2715b450..9d89be7e0544 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -2874,7 +2874,8 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) if (rt) { /* Autoconf prefix route */ if (valid_lft == 0) { - ip6_del_rt(net, rt, false); + ip6_del_rt_reason(net, rt, + RT_DEL_REASON_RA_WITHDRAWN); rt = NULL; } else { table = rt->fib6_table; diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c index 1f6f6f33ded1..f8a9ec7fa616 100644 --- a/net/ipv6/ip6_fib.c +++ b/net/ipv6/ip6_fib.c @@ -2403,7 +2403,7 @@ static void fib6_gc_table(struct net *net, hlist_for_each_entry_safe(rt, n, &tb6->tb6_gc_hlist, gc_link) if (fib6_age(rt, gc_args) == -1) - fib6_del(rt, &info, RT_DEL_REASON_UNSPEC); + fib6_del(rt, &info, RT_DEL_REASON_EXPIRED); } static void fib6_gc_all(struct net *net, struct fib6_gc_args *gc_args) diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index 2ceb655c4229..75515fd99383 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -1362,7 +1362,9 @@ static enum skb_drop_reason ndisc_router_discovery(struct sk_buff *skb) defrtr_usr_metric = in6_dev->cnf.ra_defrtr_metric; /* delete the route if lifetime is 0 or if metric needs change */ if (rt && (lifetime == 0 || rt->fib6_metric != defrtr_usr_metric)) { - ip6_del_rt(net, rt, false); + ip6_del_rt_reason(net, rt, + lifetime == 0 ? RT_DEL_REASON_RA_WITHDRAWN : + RT_DEL_REASON_UNSPEC); rt = NULL; } diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 26cdf141666c..4f1e521b89ae 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1020,7 +1020,7 @@ int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, gwaddr, dev); if (rt && !lifetime) { - ip6_del_rt(net, rt, false); + ip6_del_rt_reason(net, rt, RT_DEL_REASON_RA_WITHDRAWN); rt = NULL; } |