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netlink: Better error handling.

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Signed-off-by: Benjamin Cama <benoar@dolka.fr>
This commit is contained in:
Benjamin Cama 2011-08-16 18:45:53 +02:00
parent 7bdb42fe54
commit 1df1b625a8
1 changed files with 22 additions and 7 deletions
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25
l2tpns.c
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@ -576,6 +576,16 @@ static ssize_t netlink_recv(void *buf, ssize_t len)
return recvmsg(nlfd, &msg, 0);
}
// messages corresponding to different phases seq number
static char *tun_nl_phase_msg[] = {
"initialized",
"getting tun interface index",
"setting tun interface parameters",
"setting tun IPv4 address",
"setting tun LL IPv6 address",
"setting tun global IPv6 address",
};
//
// Set up TUN interface
static void inittun(void)
@ -798,9 +808,9 @@ static void inittun(void)
// if we get an error for seqnum < min_initok_nlseqnum,
// we must exit as initialization went wrong
if (config->ipv6_prefix.s6_addr[0])
min_initok_nlseqnum = 3 + 1; // idx + if + addr
else
min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
else
min_initok_nlseqnum = 3 + 1; // idx + if + addr
}
}
@ -3886,13 +3896,18 @@ static void mainloop(void)
if (nh->nlmsg_type == NLMSG_ERROR)
{
struct nlmsgerr *errmsg = NLMSG_DATA(nh);
if (errmsg->error && errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
if (errmsg->error)
{
LOG(0, 0, 0, "Got a fatal netlink error: seq %d flags %d code %d\n", nh->nlmsg_seq, nh->nlmsg_flags, errmsg->error);
if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
{
LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
exit(1);
}
else
LOG(1, 0, 0, "Got a netlink error: seq %d flags %d code %d\n", nh->nlmsg_seq, nh->nlmsg_flags, errmsg->error);
LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
}
// else it's a ack
}
else
LOG(1, 0, 0, "Got a unknown netlink message: type %d seq %d flags %d\n", nh->nlmsg_type, nh->nlmsg_seq, nh->nlmsg_flags);