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networkd: networkd: ndisc set SO_BINDTODEVICE on socket (#3294)

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From the issue #2004 we are receiving packet even if this
packet is not intended for this interface.

This can be reproduced.

lp3s0: Updating address: 2001:db8:1:0:7e7a:91ff:fe6d:ffe2/64 (valid for 1d)
wlp3s0: Updating address: fe80::7e7a:91ff:fe6d:ffe2/64 (valid forever)
NDisc CLIENT: Received RA from non-link-local address ::. Ignoring.
NDisc CLIENT: Received RA on wrong interface: 2 != 6. Ignoring.
NDisc CLIENT: Received RA on wrong interface: 2 != 3. Ignoring.
enp0s25: Updating address: 2001:db8:1:0:2ad2:44ff:fe6a:ae07/64 (valid for 1d)
enp0s25: Updating address: fe80::2ad2:44ff:fe6a:ae07/64 (valid forever)
NDisc CLIENT: Sent Router Solicitation
NDisc CLIENT: Sent Router Solicitation
NDisc CLIENT: Sent Router Solicitation
NDisc CLIENT: Received RA on wrong interface: 3 != 2. Ignoring.
NDisc CLIENT: Received RA on wrong interface: 3 != 6. Ignoring.
NDisc CLIENT: Received RA from non-link-local address ::. Ignoring.
NDisc CLIENT: Received RA on wrong interface: 2 != 6. Ignoring.
NDisc CLIENT: Received RA on wrong interface: 2 != 3. Ignoring.
enp0s25: Updating address: 2001:db8:1:0:2ad2:44ff:fe6a:ae07/64 (valid for 1d)
enp0s25: Updating address: fe80::2ad2:44ff:fe6a:ae07/64 (valid forever)

Add SO_BINDTODEVICE to socket
fixes #2004
This commit is contained in:
Susant Sahani 2016-05-23 14:43:57 +05:30 committed by Lennart Poettering
parent 4f9020fa10
commit 15fec93be3
1 changed files with 9 additions and 0 deletions
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9
src/libsystemd-network/icmp6-util.c
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@ -26,6 +26,7 @@
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <net/if.h>
#include <linux/if_packet.h>
#include "fd-util.h"
@ -47,6 +48,7 @@ int icmp6_bind_router_solicitation(int index) {
.ipv6mr_interface = index,
};
_cleanup_close_ int s = -1;
char ifname[IF_NAMESIZE] = "";
int r, zero = 0, one = 1, hops = 255;
s = socket(AF_INET6, SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK, IPPROTO_ICMPV6);
@ -83,6 +85,13 @@ int icmp6_bind_router_solicitation(int index) {
if (r < 0)
return -errno;
if (if_indextoname(index, ifname) == 0)
return -errno;
r = setsockopt(s, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
if (r < 0)
return -errno;
r = s;
s = -1;
return r;