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-rw-r--r--include/linux/ipv6.h1
-rw-r--r--include/uapi/linux/ipv6.h1
-rw-r--r--net/ipv6/addrconf.c105
-rw-r--r--net/ipv6/route.c11
4 files changed, 116 insertions, 2 deletions
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index cb9dcad72372..f1f32af6d9b9 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -31,6 +31,7 @@ struct ipv6_devconf {
__s32 accept_ra_defrtr;
__s32 accept_ra_min_hop_limit;
__s32 accept_ra_pinfo;
+ __s32 ignore_routes_with_linkdown;
#ifdef CONFIG_IPV6_ROUTER_PREF
__s32 accept_ra_rtr_pref;
__s32 rtr_probe_interval;
diff --git a/include/uapi/linux/ipv6.h b/include/uapi/linux/ipv6.h
index 80f3b74446a1..38b4fef20219 100644
--- a/include/uapi/linux/ipv6.h
+++ b/include/uapi/linux/ipv6.h
@@ -173,6 +173,7 @@ enum {
DEVCONF_STABLE_SECRET,
DEVCONF_USE_OIF_ADDRS_ONLY,
DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT,
+ DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
DEVCONF_MAX
};
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 53e3a9d756b0..5dfbac72f1ab 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -214,6 +214,7 @@ static struct ipv6_devconf ipv6_devconf __read_mostly = {
.initialized = false,
},
.use_oif_addrs_only = 0,
+ .ignore_routes_with_linkdown = 0,
};
static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
@@ -257,6 +258,7 @@ static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
.initialized = false,
},
.use_oif_addrs_only = 0,
+ .ignore_routes_with_linkdown = 0,
};
/* Check if a valid qdisc is available */
@@ -472,6 +474,9 @@ static int inet6_netconf_msgsize_devconf(int type)
if (type == -1 || type == NETCONFA_PROXY_NEIGH)
size += nla_total_size(4);
+ if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
+ size += nla_total_size(4);
+
return size;
}
@@ -508,6 +513,11 @@ static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
goto nla_put_failure;
+ if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
+ nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
+ devconf->ignore_routes_with_linkdown) < 0)
+ goto nla_put_failure;
+
nlmsg_end(skb, nlh);
return 0;
@@ -544,6 +554,7 @@ static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
[NETCONFA_IFINDEX] = { .len = sizeof(int) },
[NETCONFA_FORWARDING] = { .len = sizeof(int) },
[NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
+ [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
};
static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
@@ -766,6 +777,63 @@ static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
rt6_purge_dflt_routers(net);
return 1;
}
+
+static void addrconf_linkdown_change(struct net *net, __s32 newf)
+{
+ struct net_device *dev;
+ struct inet6_dev *idev;
+
+ for_each_netdev(net, dev) {
+ idev = __in6_dev_get(dev);
+ if (idev) {
+ int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
+
+ idev->cnf.ignore_routes_with_linkdown = newf;
+ if (changed)
+ inet6_netconf_notify_devconf(dev_net(dev),
+ NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
+ dev->ifindex,
+ &idev->cnf);
+ }
+ }
+}
+
+static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
+{
+ struct net *net;
+ int old;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ net = (struct net *)table->extra2;
+ old = *p;
+ *p = newf;
+
+ if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
+ if ((!newf) ^ (!old))
+ inet6_netconf_notify_devconf(net,
+ NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
+ NETCONFA_IFINDEX_DEFAULT,
+ net->ipv6.devconf_dflt);
+ rtnl_unlock();
+ return 0;
+ }
+
+ if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
+ net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
+ addrconf_linkdown_change(net, newf);
+ if ((!newf) ^ (!old))
+ inet6_netconf_notify_devconf(net,
+ NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all);
+ }
+ rtnl_unlock();
+
+ return 1;
+}
+
#endif
/* Nobody refers to this ifaddr, destroy it */
@@ -4616,6 +4684,7 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
+ array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
/* we omit DEVCONF_STABLE_SECRET for now */
array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
}
@@ -5338,6 +5407,34 @@ out:
return err;
}
+static
+int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
+ int write,
+ void __user *buffer,
+ size_t *lenp,
+ loff_t *ppos)
+{
+ int *valp = ctl->data;
+ int val = *valp;
+ loff_t pos = *ppos;
+ struct ctl_table lctl;
+ int ret;
+
+ /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
+ * we should not modify it until we get the rtnl lock.
+ */
+ lctl = *ctl;
+ lctl.data = &val;
+
+ ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
+
+ if (write)
+ ret = addrconf_fixup_linkdown(ctl, valp, val);
+ if (ret)
+ *ppos = pos;
+ return ret;
+}
+
static struct addrconf_sysctl_table
{
struct ctl_table_header *sysctl_header;
@@ -5629,7 +5726,13 @@ static struct addrconf_sysctl_table
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
-
+ },
+ {
+ .procname = "ignore_routes_with_linkdown",
+ .data = &ipv6_devconf.ignore_routes_with_linkdown,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
},
{
/* sentinel */
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 370f72785385..1c0217e61357 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -665,6 +665,12 @@ static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
{
int m;
bool match_do_rr = false;
+ struct inet6_dev *idev = rt->rt6i_idev;
+ struct net_device *dev = rt->dst.dev;
+
+ if (dev && !netif_carrier_ok(dev) &&
+ idev->cnf.ignore_routes_with_linkdown)
+ goto out;
if (rt6_check_expired(rt))
goto out;
@@ -2887,8 +2893,11 @@ static int rt6_fill_node(struct net *net,
else
rtm->rtm_type = RTN_UNICAST;
rtm->rtm_flags = 0;
- if (!netif_carrier_ok(rt->dst.dev))
+ if (!netif_carrier_ok(rt->dst.dev)) {
rtm->rtm_flags |= RTNH_F_LINKDOWN;
+ if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
+ rtm->rtm_flags |= RTNH_F_DEAD;
+ }
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
rtm->rtm_protocol = rt->rt6i_protocol;
if (rt->rt6i_flags & RTF_DYNAMIC)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.