static int usnic_is_nlreply_err(struct nlmsghdr *nlm_hdr)
{
if (nlm_hdr->nlmsg_type == NLMSG_ERROR) {
struct nlmsgerr *e = (struct nlmsgerr *)nlmsg_data(nlm_hdr);
if (nlm_hdr->nlmsg_len >= (__u32)NLMSG_SIZE(sizeof(*e)))
usnic_strerror(e->error,
"Received a netlink error message");
else
usnic_err(
"Received a truncated netlink error message\n");
return 1;
}
return 0;
}
static int usnic_is_nlreply_err(struct nlmsghdr *nlm_hdr,
struct usnic_rt_cb_arg *arg)
{
if (nlm_hdr->nlmsg_type == NLMSG_ERROR) {
struct nlmsgerr *e = (struct nlmsgerr *)nlmsg_data(nlm_hdr);
if (nlm_hdr->nlmsg_len >= (__u32)NLMSG_SIZE(sizeof(*e))) {
usnic_strerror(e->error,
"Received a netlink error message");
/* Sometimes nl_send() succeeds, but the
* request fails because the kernel is
* temporarily out of resources. In these
* cases, we should tell the caller that they
* should try again. */
if (e->error == -ECONNREFUSED) {
arg->retry = 1;
}
} else
usnic_err(
"Received a truncated netlink error message\n");
return 1;
}
return 0;
}