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confd: use force_forwarding sysctl for IPv6

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Introduced in Linux 6.17, the force_forwding flag corresponds to the
ipv4 forwarding flag, which maps perfectly to the ietf-ip.yang model.

Fixes #515

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2026-01-30 09:11:40 +01:00
parent 50514b4fc2
commit 717c1c02f1
1 changed files with 1 additions and 37 deletions
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src/confd/src/interfaces.c
+1 -37
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@@ -337,7 +337,7 @@ static int netdag_gen_sysctl(struct dagger *net,
node = lydx_get_descendant(lyd_child(dif), "ipv6", "forwarding", NULL);
err = err ? : netdag_gen_sysctl_setting(net, ifname, &sysctl, 1, "0", node,
"net.ipv6.conf.%s.forwarding", ifname);
"net.ipv6.conf.%s.force_forwarding", ifname);
if (!strcmp(ifname, "lo")) /* skip for now */
goto skip_mtu;
@@ -353,39 +353,6 @@ skip_mtu:
return err;
}
/*
* The global IPv6 forwarding lever is off by default, enabled when any
* interface has IPv6 forwarding enabled.
*/
static int netdag_ipv6_forwarding(struct lyd_node *cifs, struct dagger *net)
{
struct lyd_node *cif;
FILE *sysctl = NULL;
int ena = 0;
LYX_LIST_FOR_EACH(cifs, cif, "interface")
ena |= lydx_is_enabled(lydx_get_child(cif, "ipv6"), "forwarding");
if (ena)
sysctl = dagger_fopen_next(net, "init", "@post", NETDAG_INIT_POST, "ipv6.sysctl");
else
sysctl = dagger_fopen_current(net, "exit", "@pre", NETDAG_EXIT_PRE, "ipv6.sysctl");
if (!sysctl) {
/*
* Cannot create exit code in gen: -1. Safe to ignore
* since ipv6 forwarding is disabled by default.
*/
if (dagger_is_bootstrap(net) && !ena)
return 0;
return -EIO;
}
fprintf(sysctl, "net.ipv6.conf.all.forwarding = %d\n", ena);
fclose(sysctl);
return 0;
}
static int dummy_gen(struct lyd_node *dif, struct lyd_node *cif, FILE *ip)
{
const char *ifname = lydx_get_cattr(cif, "name");
@@ -782,9 +749,6 @@ static sr_error_t ifchange_post(sr_session_ctx_t *session, struct dagger *net,
{
int err = 0;
/* Figure out value of global IPv6 forwarding flag. Issue #785 */
err |= netdag_ipv6_forwarding(cifs, net);
/* For each configured bridge, the corresponding multicast
* querier settings depend on both the bridge config and on
* the presence of matching VLAN uppers. Since these can be