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socket: Add osmo_sock_mcast_iface_set() to bind multicast to device 

Change-Id: Ib52d22710020b56965aefcef09bde8247ace4a9c
Related: OS#2966
This commit is contained in:
Harald Welte 2020-03-07 14:59:05 +01:00
parent 31c29ea051
commit 44b9926c84
2 changed files with 23 additions and 0 deletions
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1
include/osmocom/core/socket.h
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@ -87,6 +87,7 @@ int osmo_sock_get_remote_ip_port(int fd, char *port, size_t len);
int osmo_sock_mcast_loop_set(int fd, bool enable);
int osmo_sock_mcast_ttl_set(int fd, uint8_t ttl);
int osmo_sock_mcast_all_set(int fd, bool enable);
int osmo_sock_mcast_iface_set(int fd, const char *ifname);
int osmo_sock_mcast_subscribe(int fd, const char *grp_addr);
int osmo_sock_local_ip(char *local_ip, const char *remote_ip);

22
src/socket.c
View File

@ -41,6 +41,7 @@
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
@ -1194,6 +1195,27 @@ int osmo_sock_mcast_ttl_set(int fd, uint8_t ttl)
}
}
/*! Set the network device to which we should bind the multicast socket
* \param[in] fd file descriptor of related socket
* \param[in] ifname name of network interface to user for multicast
* \returns 0 on success; negative otherwise */
int osmo_sock_mcast_iface_set(int fd, const char *ifname)
{
unsigned int ifindex;
struct ip_mreqn mr;
/* first, resolve interface name to ifindex */
ifindex = if_nametoindex(ifname);
if (ifindex == 0)
return -errno;
/* next, configure kernel to use that ifindex for this sockets multicast traffic */
memset(&mr, 0, sizeof(mr));
mr.imr_ifindex = ifindex;
return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, &mr, sizeof(mr));
}
/*! Enable/disable receiving all multicast packets, even for non-subscribed groups
* \param[in] fd file descriptor of related socket
* \param[in] enable Enable or Disable receiving of all packets