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modules: Support interface creation at runtime

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Interfaces might be created at runtime, e.g. USB network adapters or VPN
connections.  To support these we (a) don't close the module if the
interface can't be found at startup and (b) check the interface index
for every link event, as it might have changed after recreation.
This commit is contained in:
Timur Celik 2021-07-06 00:15:18 +02:00
parent e4a0b375e5
commit a6126c774f
1 changed files with 5 additions and 11 deletions
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16
modules/network.c
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@ -230,13 +230,9 @@ handle_link(struct module *mod, uint16_t type,
struct private *m = mod->private;
if (m->ifindex == -1) {
/* We don't know our own ifindex yet. Let's see if we can find
* it in the message */
if (!find_my_ifindex(mod, msg, len)) {
/* Nope, message wasn't for us (IFLA_IFNAME mismatch) */
return;
}
if (!find_my_ifindex(mod, msg, len)) {
/* Message wasn't for us (IFLA_IFNAME mismatch) */
return;
}
assert(m->ifindex >= 0);
@ -314,8 +310,6 @@ handle_address(struct module *mod, uint16_t type,
struct private *m = mod->private;
assert(m->ifindex >= 0);
if (msg->ifa_index != m->ifindex) {
/* Not for us */
return;
@ -420,8 +414,8 @@ parse_reply(struct module *mod, const struct nlmsghdr *hdr, size_t len)
switch (hdr->nlmsg_type) {
case NLMSG_DONE:
if (m->ifindex == -1) {
LOG_ERR("%s: failed to find interface", m->iface);
return false;
LOG_WARN("%s: failed to find interface", m->iface);
return true;
}
/* Request initial list of IPv4/6 addresses */