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| author |   Nikolay Aleksandrov <nikolay@nvidia.com> | 2021-12-27 19:21:16 +0200 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2021-12-29 12:59:38 -0800 |
| commit | f83a112bd91a494cdee671aec74e777470fb4a07 (patch) | |
| tree | d28b66672917adc72af376b2e1a64b1c1f0e8fa8 /net/bridge/br_private.h | |
| parent | net: bridge: mcast: add and enforce query interval minimum (diff) | |
| download | linux-dev-f83a112bd91a494cdee671aec74e777470fb4a07.tar.xz linux-dev-f83a112bd91a494cdee671aec74e777470fb4a07.zip | |
net: bridge: mcast: add and enforce startup query interval minimum
As reported[1] if startup query interval is set too low in combination with
large number of startup queries and we have multiple bridges or even a
single bridge with multiple querier vlans configured we can crash the
machine. Add a 1 second minimum which must be enforced by overwriting the
value if set lower (i.e. without returning an error) to avoid breaking
user-space. If that happens a log message is emitted to let the admin know
that the startup interval has been set to the minimum. It doesn't make
sense to make the startup interval lower than the normal query interval
so use the same value of 1 second. The issue has been present since these
intervals could be user-controlled.
[1] https://lore.kernel.org/netdev/e8b9ce41-57b9-b6e2-a46a-ff9c791cf0ba@gmail.com/
Fixes: d902eee43f19 ("bridge: Add multicast count/interval sysfs entries")
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | net/bridge/br_private.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 4ed7f11042e8..2187a0c3fd22 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -29,6 +29,7 @@ #define BR_MULTICAST_DEFAULT_HASH_MAX 4096 #define BR_MULTICAST_QUERY_INTVL_MIN msecs_to_jiffies(1000) +#define BR_MULTICAST_STARTUP_QUERY_INTVL_MIN BR_MULTICAST_QUERY_INTVL_MIN #define BR_HWDOM_MAX BITS_PER_LONG @@ -966,6 +967,8 @@ size_t br_multicast_querier_state_size(void); size_t br_rports_size(const struct net_bridge_mcast *brmctx); void br_multicast_set_query_intvl(struct net_bridge_mcast *brmctx, unsigned long val); +void br_multicast_set_startup_query_intvl(struct net_bridge_mcast *brmctx, + unsigned long val); static inline bool br_group_is_l2(const struct br_ip *group) { |