d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

netlink: make the maximum allowed netlink socket buffer runtime tunable.

Browse Source 
Dumping large routng tables (>1M paths with multipath) require the socket
 buffer which is larger than the currently defined limit.
Allow the limit to be set in runtime, similar to kern.ipc.maxsockbuf.

Reported by:	Marek Zarychta <zarychtam@plan-b.pwste.edu.pl>
MFC after:	1 day
This commit is contained in:
Alexander V. Chernikov 2023-02-27 10:44:54 +00:00
parent a4b92fefd2
commit 28a5d88f70
2 changed files with 27 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
share/man/man4/netlink.4
View File

@ -280,6 +280,12 @@ Default receive buffer for the netlink socket.
Note that the socket recvspace has to be least as long as the longest
message that can be received from this socket.
.El
.Bl -tag -width indent
.It Va net.netlink.nl_maxsockbuf
Maximum receive buffer for the netlink socket that can be set via
.Dv SO_RCVBUF
socket option.
.El
.Sh DEBUGGING
Netlink implements per-functional-unit debugging, with different severities
controllable via the

21
sys/netlink/netlink_domain.c
View File

@ -77,6 +77,11 @@ SYSCTL_ULONG(_net_netlink, OID_AUTO, recvspace, CTLFLAG_RW, &nl_recvspace, 0,
extern u_long sb_max_adj;
static u_long nl_maxsockbuf = 512 * 1024 * 1024; /* 512M, XXX: init based on physmem */
static int sysctl_handle_nl_maxsockbuf(SYSCTL_HANDLER_ARGS);
SYSCTL_OID(_net_netlink, OID_AUTO, nl_maxsockbuf,
CTLTYPE_ULONG | CTLFLAG_RW | CTLFLAG_MPSAFE, &nl_maxsockbuf, 0,
sysctl_handle_nl_maxsockbuf, "LU",
"Maximum Netlink socket buffer size");
uint32_t
nlp_get_pid(const struct nlpcb *nlp)
@ -675,6 +680,22 @@ nl_ctloutput(struct socket *so, struct sockopt *sopt)
return (error);
}
static int
sysctl_handle_nl_maxsockbuf(SYSCTL_HANDLER_ARGS)
{
int error = 0;
u_long tmp_maxsockbuf = nl_maxsockbuf;
error = sysctl_handle_long(oidp, &tmp_maxsockbuf, arg2, req);
if (error || !req->newptr)
return (error);
if (tmp_maxsockbuf < MSIZE + MCLBYTES)
return (EINVAL);
nl_maxsockbuf = tmp_maxsockbuf;
return (0);
}
static int
nl_setsbopt(struct socket *so, struct sockopt *sopt)
{