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multicast.4: Fix disabling multicast forwarding

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Reviewed by: markj, glebius
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D55266
This commit is contained in:
Pouria Mousavizadeh Tehrani
2026-02-13 02:36:15 +03:30
parent fd52a9becc
commit f2c2e5b0bf
1 changed files with 22 additions and 4 deletions
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share/man/man4/multicast.4
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@@ -23,7 +23,7 @@
.\" FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER .\" FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
.\" DEALINGS IN THE SOFTWARE. .\" DEALINGS IN THE SOFTWARE.
.\" .\"
.Dd May 27, 2009 .Dd February 13, 2026
.Dt MULTICAST 4 .Dt MULTICAST 4
.Os .Os
.\" .\"
@@ -124,15 +124,15 @@ Therefore, for portability reason the multicast
routing socket should be reused for IGMP and MLD messages as well. routing socket should be reused for IGMP and MLD messages as well.
.Pp .Pp
After the multicast routing socket is open, it can be used to enable After the multicast routing socket is open, it can be used to enable
or disable multicast forwarding in the kernel: multicast forwarding in the kernel:
.Bd -literal .Bd -literal
/* IPv4 */ /* IPv4 */
int v = 1; /* 1 to enable, or 0 to disable */ int v = 1;
setsockopt(mrouter_s4, IPPROTO_IP, MRT_INIT, (void *)&v, sizeof(v)); setsockopt(mrouter_s4, IPPROTO_IP, MRT_INIT, (void *)&v, sizeof(v));
.Ed .Ed
.Bd -literal .Bd -literal
/* IPv6 */ /* IPv6 */
int v = 1; /* 1 to enable, or 0 to disable */ int v = 1;
setsockopt(mrouter_s6, IPPROTO_IPV6, MRT6_INIT, (void *)&v, sizeof(v)); setsockopt(mrouter_s6, IPPROTO_IPV6, MRT6_INIT, (void *)&v, sizeof(v));
\&... \&...
/* If necessary, filter all ICMPv6 messages */ /* If necessary, filter all ICMPv6 messages */
@@ -142,6 +142,24 @@ setsockopt(mrouter_s6, IPPROTO_ICMPV6, ICMP6_FILTER, (void *)&filter,
sizeof(filter)); sizeof(filter));
.Ed .Ed
.Pp .Pp
When applied to the multicast routing socket, the
.Dv MRT_DONE
and
.Dv MRT6_DONE
socket options disable multicast forwarding in the kernel:
.Bd -literal
/* IPv4 */
int v = 1;
setsockopt(mrouter_s4, IPPROTO_IP, MRT_DONE, (void *)&v, sizeof(v));
.Ed
.Bd -literal
/* IPv6 */
int v = 1;
setsockopt(mrouter_s6, IPPROTO_IPV6, MRT6_DONE, (void *)&v, sizeof(v));
.Ed
.Pp
Closing the socket has the same effect.
.Pp
After multicast forwarding is enabled, the multicast routing socket After multicast forwarding is enabled, the multicast routing socket
can be used to enable PIM processing in the kernel if we are running PIM-SM or can be used to enable PIM processing in the kernel if we are running PIM-SM or
PIM-DM PIM-DM