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IPv4: Extend 'fib_notify_on_flag_change' sysctl

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Add the value '2' to 'fib_notify_on_flag_change' to allow sending
notifications only for failed route installation.

Separate value is added for such notifications because there are less of
them, so they do not impact performance and some users will find them more
important.

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amit Cohen 2021-02-07 10:22:51 +02:00 committed by David S. Miller
parent 36c5100e85
commit 648106c30a
3 changed files with 9 additions and 2 deletions
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3
Documentation/networking/ip-sysctl.rst
View File

@ -180,7 +180,7 @@ min_adv_mss - INTEGER
fib_notify_on_flag_change - INTEGER
Whether to emit RTM_NEWROUTE notifications whenever RTM_F_OFFLOAD/
RTM_F_TRAP flags are changed.
RTM_F_TRAP/RTM_F_OFFLOAD_FAILED flags are changed.
After installing a route to the kernel, user space receives an
acknowledgment, which means the route was installed in the kernel,
@ -197,6 +197,7 @@ fib_notify_on_flag_change - INTEGER
- 0 - Do not emit notifications.
- 1 - Emit notifications.
- 2 - Emit notifications only for RTM_F_OFFLOAD_FAILED flag change.
IP Fragmentation:

6
net/ipv4/fib_trie.c
View File

@ -1053,6 +1053,12 @@ void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri)
fa_match->offload = fri->offload;
fa_match->trap = fri->trap;
/* 2 means send notifications only if offload_failed was changed. */
if (net->ipv4.sysctl_fib_notify_on_flag_change == 2 &&
fa_match->offload_failed == fri->offload_failed)
goto out;
fa_match->offload_failed = fri->offload_failed;
if (!net->ipv4.sysctl_fib_notify_on_flag_change)

2
net/ipv4/sysctl_net_ipv4.c
View File

@ -1361,7 +1361,7 @@ static struct ctl_table ipv4_net_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
.extra2 = &two,
},
{ }
};