summaryrefslogtreecommitdiffhomepage
diff options
context:
space:
mode:
authorFelix Fietkau <nbd@openwrt.org>2012-05-20 01:40:10 +0200
committerFelix Fietkau <nbd@openwrt.org>2012-05-20 01:40:10 +0200
commit575b1fe1bc8f15e65d89a0905e1640277c17fadc (patch)
tree2862c096b2c5d6cc68cab57eed6a42141506e336
parent0079ac42fcff0e703467c188c37db902ee8cead8 (diff)
replace the kernel's implicit network routes if the metric is set
-rw-r--r--interface-ip.c53
-rw-r--r--interface-ip.h5
-rw-r--r--system-linux.c2
3 files changed, 46 insertions, 14 deletions
diff --git a/interface-ip.c b/interface-ip.c
index b681b81..0558b6c 100644
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -50,23 +50,33 @@ const struct config_param_list route_attr_list = {
.params = route_attr,
};
-static bool
-match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
+static void
+clear_if_addr(union if_addr *a, int mask)
{
- uint8_t *p1, *p2;
int m_bytes = (mask + 7) / 8;
uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
+ uint8_t *p = (uint8_t *) a;
+
+ if (m_bytes < sizeof(a))
+ memset(p + m_bytes, 0, sizeof(a) - m_bytes);
+
+ p[m_bytes - 1] &= ~m_clear;
+}
- p1 = alloca(m_bytes);
- p2 = alloca(m_bytes);
+static bool
+match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
+{
+ union if_addr *p1, *p2;
- memcpy(p1, a1, m_bytes);
- memcpy(p2, a2, m_bytes);
+ p1 = alloca(sizeof(*a1));
+ p2 = alloca(sizeof(*a2));
- p1[m_bytes - 1] &= ~m_clear;
- p2[m_bytes - 1] &= ~m_clear;
+ memcpy(p1, a1, sizeof(*a1));
+ clear_if_addr(p1, mask);
+ memcpy(p2, a2, sizeof(*a2));
+ clear_if_addr(p2, mask);
- return !memcmp(p1, p2, m_bytes);
+ return !memcmp(p1, p2, sizeof(*p1));
}
static bool
@@ -252,6 +262,7 @@ interface_update_proto_addr(struct vlist_tree *tree,
struct device *dev;
struct device_addr *a_new = NULL, *a_old = NULL;
bool keep = false;
+ struct device_route *route;
ip = container_of(tree, struct interface_ip_settings, addr);
iface = ip->iface;
@@ -292,10 +303,28 @@ interface_update_proto_addr(struct vlist_tree *tree,
}
if (node_new) {
- if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep)
- system_add_address(dev, a_new);
a_new->enabled = true;
+ if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
+ system_add_address(dev, a_new);
+ if (iface->metric)
+ goto replace_route;
+ }
}
+ return;
+
+replace_route:
+ route = calloc(1, sizeof(*route));
+ route->iface = iface;
+ route->flags = a_new->flags | DEVADDR_KERNEL;
+ route->mask = a_new->mask;
+ memcpy(&route->addr, &a_new->addr, sizeof(route->addr));
+ clear_if_addr(&route->addr, route->mask);
+
+ system_del_route(dev, route);
+
+ route->flags &= ~DEVADDR_KERNEL;
+ route->metric = iface->metric;
+ vlist_add(&ip->route, &route->node, &route->flags);
}
static bool
diff --git a/interface-ip.h b/interface-ip.h
index ae5a63e..d206eca 100644
--- a/interface-ip.h
+++ b/interface-ip.h
@@ -26,7 +26,10 @@ enum device_addr_flags {
DEVADDR_EXTERNAL = (1 << 2),
/* route overrides the default interface metric */
- DEVROUTE_METRIC = (1 << 3)
+ DEVROUTE_METRIC = (1 << 3),
+
+ /* route automatically added by kernel */
+ DEVADDR_KERNEL = (1 << 4),
};
union if_addr {
diff --git a/system-linux.c b/system-linux.c
index af252ea..c7b8b8f 100644
--- a/system-linux.c
+++ b/system-linux.c
@@ -899,7 +899,7 @@ static int system_rt(struct device *dev, struct device_route *route, int cmd)
.rtm_family = (alen == 4) ? AF_INET : AF_INET6,
.rtm_dst_len = route->mask,
.rtm_table = RT_TABLE_MAIN,
- .rtm_protocol = RTPROT_BOOT,
+ .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_BOOT,
.rtm_scope = scope,
.rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
};