<p>laforge <strong>submitted</strong> this change.</p><p><a href="https://gerrit.osmocom.org/c/libosmocore/+/17418">View Change</a></p><div style="white-space:pre-wrap">Approvals:
  laforge: Looks good to me, approved
  fixeria: Looks good to me, but someone else must approve
  Jenkins Builder: Verified

</div><pre style="font-family: monospace,monospace; white-space: pre-wrap;">socket: Add osmo_sock_mcast_iface_set() to bind multicast to device<br><br>Change-Id: Ib52d22710020b56965aefcef09bde8247ace4a9c<br>Related: OS#2966<br>---<br>M include/osmocom/core/socket.h<br>M src/socket.c<br>2 files changed, 23 insertions(+), 0 deletions(-)<br><br></pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;"><span>diff --git a/include/osmocom/core/socket.h b/include/osmocom/core/socket.h</span><br><span>index e26ca0d..129612c 100644</span><br><span>--- a/include/osmocom/core/socket.h</span><br><span>+++ b/include/osmocom/core/socket.h</span><br><span>@@ -87,6 +87,7 @@</span><br><span> int osmo_sock_mcast_loop_set(int fd, bool enable);</span><br><span> int osmo_sock_mcast_ttl_set(int fd, uint8_t ttl);</span><br><span> int osmo_sock_mcast_all_set(int fd, bool enable);</span><br><span style="color: hsl(120, 100%, 40%);">+int osmo_sock_mcast_iface_set(int fd, const char *ifname);</span><br><span> int osmo_sock_mcast_subscribe(int fd, const char *grp_addr);</span><br><span> </span><br><span> int osmo_sock_local_ip(char *local_ip, const char *remote_ip);</span><br><span>diff --git a/src/socket.c b/src/socket.c</span><br><span>index 9b1d30e..503ceaf 100644</span><br><span>--- a/src/socket.c</span><br><span>+++ b/src/socket.c</span><br><span>@@ -41,6 +41,7 @@</span><br><span> #include <sys/socket.h></span><br><span> #include <sys/types.h></span><br><span> #include <sys/un.h></span><br><span style="color: hsl(120, 100%, 40%);">+#include <net/if.h></span><br><span> </span><br><span> #include <netinet/in.h></span><br><span> #include <arpa/inet.h></span><br><span>@@ -1194,6 +1195,27 @@</span><br><span>       }</span><br><span> }</span><br><span> </span><br><span style="color: hsl(120, 100%, 40%);">+/*! Set the network device to which we should bind the multicast socket</span><br><span style="color: hsl(120, 100%, 40%);">+ *  \param[in] fd file descriptor of related socket</span><br><span style="color: hsl(120, 100%, 40%);">+ *  \param[in] ifname name of network interface to user for multicast</span><br><span style="color: hsl(120, 100%, 40%);">+ *  \returns 0 on success; negative otherwise */</span><br><span style="color: hsl(120, 100%, 40%);">+int osmo_sock_mcast_iface_set(int fd, const char *ifname)</span><br><span style="color: hsl(120, 100%, 40%);">+{</span><br><span style="color: hsl(120, 100%, 40%);">+       unsigned int ifindex;</span><br><span style="color: hsl(120, 100%, 40%);">+ struct ip_mreqn mr;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ /* first, resolve interface name to ifindex */</span><br><span style="color: hsl(120, 100%, 40%);">+        ifindex = if_nametoindex(ifname);</span><br><span style="color: hsl(120, 100%, 40%);">+     if (ifindex == 0)</span><br><span style="color: hsl(120, 100%, 40%);">+             return -errno;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+      /* next, configure kernel to use that ifindex for this sockets multicast traffic */</span><br><span style="color: hsl(120, 100%, 40%);">+   memset(&mr, 0, sizeof(mr));</span><br><span style="color: hsl(120, 100%, 40%);">+       mr.imr_ifindex = ifindex;</span><br><span style="color: hsl(120, 100%, 40%);">+     return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, &mr, sizeof(mr));</span><br><span style="color: hsl(120, 100%, 40%);">+}</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span> /*! Enable/disable receiving all multicast packets, even for non-subscribed groups</span><br><span>  *  \param[in] fd file descriptor of related socket</span><br><span>  *  \param[in] enable Enable or Disable receiving of all packets</span><br><span></span><br></pre><p>To view, visit <a href="https://gerrit.osmocom.org/c/libosmocore/+/17418">change 17418</a>. To unsubscribe, or for help writing mail filters, visit <a href="https://gerrit.osmocom.org/settings">settings</a>.</p><div itemscope itemtype="http://schema.org/EmailMessage"><div itemscope itemprop="action" itemtype="http://schema.org/ViewAction"><link itemprop="url" href="https://gerrit.osmocom.org/c/libosmocore/+/17418"/><meta itemprop="name" content="View Change"/></div></div>

<div style="display:none"> Gerrit-Project: libosmocore </div>
<div style="display:none"> Gerrit-Branch: master </div>
<div style="display:none"> Gerrit-Change-Id: Ib52d22710020b56965aefcef09bde8247ace4a9c </div>
<div style="display:none"> Gerrit-Change-Number: 17418 </div>
<div style="display:none"> Gerrit-PatchSet: 5 </div>
<div style="display:none"> Gerrit-Owner: laforge <laforge@osmocom.org> </div>
<div style="display:none"> Gerrit-Reviewer: Jenkins Builder </div>
<div style="display:none"> Gerrit-Reviewer: fixeria <axilirator@gmail.com> </div>
<div style="display:none"> Gerrit-Reviewer: laforge <laforge@osmocom.org> </div>
<div style="display:none"> Gerrit-Reviewer: pespin <pespin@sysmocom.de> </div>
<div style="display:none"> Gerrit-CC: neels <nhofmeyr@sysmocom.de> </div>
<div style="display:none"> Gerrit-MessageType: merged </div>