diff options
| author | Eric Dumazet <edumazet@google.com> | 2025-08-28 19:58:17 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-08-29 19:36:32 -0700 |
| commit | b775ecf1655cedbc465fd6699ab18a2bc4e7a352 (patch) | |
| tree | b7bc33be5c13dfd4f2fdda429de36aa390dce43b /net/ipv6/output_core.c | |
| parent | caedcc5b6df1b2e2b5f39079e3369c1d4d5c5f50 (diff) | |
ipv6: start using dst_dev_rcu()
Refactor icmpv6_xrlim_allow() and ip6_dst_hoplimit()
so that we acquire rcu_read_lock() a bit longer
to be able to use dst_dev_rcu() instead of dst_dev().
__ip6_rt_update_pmtu() and rt6_do_redirect can directly
use dst_dev_rcu() in sections already holding rcu_read_lock().
Small changes to use dst_dev_net_rcu() in
ip6_default_advmss(), ipv6_sock_ac_join(),
ip6_mc_find_dev() and ndisc_send_skb().
Fixes: 4a6ce2b6f2ec ("net: introduce a new function dst_dev_put()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20250828195823.3958522-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv6/output_core.c')
| -rw-r--r-- | net/ipv6/output_core.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c index d21fe27fe21e..1c9b283a4132 100644 --- a/net/ipv6/output_core.c +++ b/net/ipv6/output_core.c @@ -104,18 +104,20 @@ EXPORT_SYMBOL(ip6_find_1stfragopt); int ip6_dst_hoplimit(struct dst_entry *dst) { int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); + + rcu_read_lock(); if (hoplimit == 0) { - struct net_device *dev = dst_dev(dst); + struct net_device *dev = dst_dev_rcu(dst); struct inet6_dev *idev; - rcu_read_lock(); idev = __in6_dev_get(dev); if (idev) hoplimit = READ_ONCE(idev->cnf.hop_limit); else hoplimit = READ_ONCE(dev_net(dev)->ipv6.devconf_all->hop_limit); - rcu_read_unlock(); } + rcu_read_unlock(); + return hoplimit; } EXPORT_SYMBOL(ip6_dst_hoplimit); |