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gluon-radv-filterd: Reset chain when daemon shuts down

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The daemon must make sure that it doesn't filter any incoming router
advertisement when it was shut down. This can be achieved by flushing all
current rules and/or adding an ACCEPT all rule at the end. When both
commands work, the state of the chain will be the same as
/lib/gluon/ebtables/400-radv-filter created it.

This doesn't handle the problem that the daemon may have been crashed and
thus the chain is in an undefined state.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
This commit is contained in:
Sven Eckelmann 2017-12-20 14:32:39 +01:00 committed by Jan-Philipp Litza
parent bc3b3e300f
commit c39a62a63a
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GPG Key ID: 1FB658053CE27196
1 changed files with 17 additions and 0 deletions
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17
package/gluon-radv-filterd/src/gluon-radv-filterd.c
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@ -118,6 +118,8 @@ static struct global {
.mesh_iface = "bat0",
};
static int fork_execvp_timeout(struct timespec *timeout, const char *file,
const char *const argv[]);
static void error_message(int status, int errnum, char *message, ...) {
va_list ap;
@ -149,6 +151,10 @@ static int timespec_diff(struct timespec *tv1, struct timespec *tv2,
static void cleanup(void) {
struct router *router;
struct timespec timeout = {
.tv_nsec = EBTABLES_TIMEOUT,
};
close(G.sock);
while (G.routers != NULL) {
@ -156,6 +162,17 @@ static void cleanup(void) {
G.routers = router->next;
free(router);
}
if (G.chain) {
/* Reset chain to accept everything again */
if (fork_execvp_timeout(&timeout, "ebtables", (const char *[])
{ "ebtables", "-F", G.chain, NULL }))
DEBUG_MSG("warning: flushing ebtables chain %s failed, not adding a new rule", G.chain);
if (fork_execvp_timeout(&timeout, "ebtables", (const char *[])
{ "ebtables", "-A", G.chain, "-j", "ACCEPT", NULL }))
DEBUG_MSG("warning: adding new rule to ebtables chain %s failed", G.chain);
}
}
static void usage(const char *msg) {