[PATCH] libosmocore[master]: socket: Add new OSMO_SOCK_F_NO_MCAST_ALL option

[Harald Welte]

Review at  https://gerrit.osmocom.org/3241

socket: Add new OSMO_SOCK_F_NO_MCAST_ALL option

Using this option at socket creation, the caller can request disabling
the IP_MULTICAST_ALL socket option.

Change-Id: I5ab5de45c0b64ceb3636ea98245a23defa24ffd4
---
M include/osmocom/core/socket.h
M src/socket.c
2 files changed, 10 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/41/3241/1

diff --git a/include/osmocom/core/socket.h b/include/osmocom/core/socket.h
index 695e1d7..ebfcab3 100644
--- a/include/osmocom/core/socket.h
+++ b/include/osmocom/core/socket.h
@@ -22,6 +22,8 @@
 #define OSMO_SOCK_F_NONBLOCK	(1 << 2)
 /*! disable multiast loop (IP_MULTICAST_LOOP) */
 #define OSMO_SOCK_F_NO_MCAST_LOOP (1 << 3)
+/*! disable receiving all multiast even for non-subscribed groups */
+#define OSMO_SOCK_F_NO_MCAST_ALL  (1 << 4)
 
 int osmo_sock_init(uint16_t family, uint16_t type, uint8_t proto,
 		   const char *host, uint16_t port, unsigned int flags);
diff --git a/src/socket.c b/src/socket.c
index 0b8c22d..871873b 100644
--- a/src/socket.c
+++ b/src/socket.c
@@ -132,6 +132,14 @@
 		}
 	}
 
+	if (flags & OSMO_SOCK_F_NO_MCAST_ALL) {
+		rc = osmo_sock_mcast_all_set(fd, false);
+		if (rc < 0) {
+			LOGP(DLGLOBAL, LOGL_ERROR, "unable to disable receive of all multicast: %s\n",
+				strerror(errno));
+			return rc;
+		}
+	}
 	return 0;
 }
 

-- 
To view, visit https://gerrit.osmocom.org/3241
To unsubscribe, visit https://gerrit.osmocom.org/settings

Gerrit-MessageType: newchange
Gerrit-Change-Id: I5ab5de45c0b64ceb3636ea98245a23defa24ffd4
Gerrit-PatchSet: 1
Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Owner: Harald Welte <laforge at gnumonks.org>