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| author |   Nikolay Aleksandrov <nikolay@nvidia.com> | 2021-12-27 19:21:15 +0200 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2021-12-29 12:59:37 -0800 |
| commit | 99b40610956a8a8755653a67392e2a8b772453be (patch) | |
| tree | 53c62e4e8b7202de4f28fc10af540f87de143ce1 /net/bridge/br_private.h | |
| parent | ipv6: raw: check passed optlen before reading (diff) | |
| download | linux-dev-99b40610956a8a8755653a67392e2a8b772453be.tar.xz linux-dev-99b40610956a8a8755653a67392e2a8b772453be.zip | |
net: bridge: mcast: add and enforce query interval minimum
As reported[1] if query interval is set too low 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 administrator know that the interval has been set to the minimum.
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 c0efd697865a..4ed7f11042e8 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -28,6 +28,7 @@ #define BR_MAX_PORTS (1<<BR_PORT_BITS) #define BR_MULTICAST_DEFAULT_HASH_MAX 4096 +#define BR_MULTICAST_QUERY_INTVL_MIN msecs_to_jiffies(1000) #define BR_HWDOM_MAX BITS_PER_LONG @@ -963,6 +964,8 @@ int br_multicast_dump_querier_state(struct sk_buff *skb, int nest_attr); 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); static inline bool br_group_is_l2(const struct br_ip *group) { |