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netutils/dhcpd: bind socket to the interface

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Change-Id: Icf7cf8147ceca5e27b7b923d520e2189741d9882
Signed-off-by: chao.an <anchao@xiaomi.com>
This commit is contained in:
chao.an 2021-06-16 16:11:34 +08:00 committed by Alan Carvalho de Assis
parent 8ba32a8c16
commit 496aa3ef4f
1 changed files with 19 additions and 2 deletions
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21
netutils/dhcpd/dhcpd.c
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@ -56,6 +56,7 @@
#include <net/if.h> #include <net/if.h>
#include <netinet/in.h> #include <netinet/in.h>
#include <netinet/udp.h>
#include <arpa/inet.h> #include <arpa/inet.h>
#include "netutils/netlib.h" #include "netutils/netlib.h"
@ -820,7 +821,7 @@ static int dhcp_addoption32p(uint8_t code, FAR uint8_t *value)
* Name: dhcpd_socket * Name: dhcpd_socket
****************************************************************************/ ****************************************************************************/
static inline int dhcpd_socket(void) static inline int dhcpd_socket(FAR const char *interface)
{ {
int sockfd; int sockfd;
#if defined(HAVE_SO_REUSEADDR) || defined(HAVE_SO_BROADCAST) #if defined(HAVE_SO_REUSEADDR) || defined(HAVE_SO_BROADCAST)
@ -863,6 +864,22 @@ static inline int dhcpd_socket(void)
} }
#endif #endif
#ifdef CONFIG_NET_UDP_BINDTODEVICE
/* Bind socket to interface, because UDP packets have to be sent to the
* broadcast address at a moment when it is not possible to decide the
* target network device using the local or remote address (which is,
* by definition and purpose of DHCP, undefined yet).
*/
if (setsockopt(sockfd, IPPROTO_UDP, UDP_BINDTODEVICE,
interface, strlen(interface)) < 0)
{
ninfo("ERROR: setsockopt UDP_BINDTODEVICE failed: %d\n", errno);
close(sockfd);
return ERROR;
}
#endif
return sockfd; return sockfd;
} }
@ -1396,7 +1413,7 @@ static inline int dhcpd_openlistener(FAR const char *interface)
/* Create a socket to listen for requests from DHCP clients */ /* Create a socket to listen for requests from DHCP clients */
sockfd = dhcpd_socket(); sockfd = dhcpd_socket(interface);
if (sockfd < 0) if (sockfd < 0)
{ {
nerr("ERROR: socket failed: %d\n", errno); nerr("ERROR: socket failed: %d\n", errno);