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netlink: NETLINK_GET_STRICT_CHK is not available on older kernels

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For example on 4.19. Don't fail if we can't set it, filter on
interface index in nl_addr().

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-10-19 09:08:06 +02:00
parent 8a874ecf58
commit 5496074862
1 changed files with 6 additions and 3 deletions
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9
netlink.c
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@ -50,14 +50,15 @@ static int __nl_sock_init(void *arg)
int *s = &nl_sock, v = 1;
ns:
if (((*s) = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0 ||
bind(*s, (struct sockaddr *)&addr, sizeof(addr)) ||
setsockopt(*s, SOL_NETLINK, NETLINK_GET_STRICT_CHK, &v, sizeof(v)))
if (((*s) = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0 ||
bind(*s, (struct sockaddr *)&addr, sizeof(addr)))
*s = -1;
if (*s == -1 || !c || s == &nl_sock_ns)
return 0;
setsockopt(*s, SOL_NETLINK, NETLINK_GET_STRICT_CHK, &v, sizeof(v));
ns_enter((struct ctx *)arg);
s = &nl_sock_ns;
goto ns;
@ -425,6 +426,8 @@ void nl_addr(int ns, unsigned int ifi, sa_family_t af,
goto next;
ifa = (struct ifaddrmsg *)NLMSG_DATA(nh);
if (ifa->ifa_index != ifi)
goto next;
for (rta = (struct rtattr *)IFA_RTA(ifa), na = RTM_PAYLOAD(nh);
RTA_OK(rta, na); rta = RTA_NEXT(rta, na)) {