This is to be used by an implementation of MSS clamping which
requires access to the mtu of interfaces.
Cc: Jesse Gross <je...@nicira.com>
Cc: Kyle Mestery <kmest...@cisco.com>
Signed-off-by: Simon Horman <ho...@verge.net.au>
---
* v5
Initial posting
---
lib/route-table.c | 53 ++++++++++++++++++++++++++++++++++++++++++-----------
lib/route-table.h | 1 +
2 files changed, 43 insertions(+), 11 deletions(-)
diff --git a/lib/route-table.c b/lib/route-table.c
index 63a09f2..cde9ee4 100644
--- a/lib/route-table.c
+++ b/lib/route-table.c
@@ -62,6 +62,7 @@ struct name_node {
uint32_t ifi_index; /* Kernel interface index. */
char ifname[IFNAMSIZ]; /* Interface name. */
+ int mtu; /* Current MTU */
};
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
@@ -92,6 +93,7 @@ static int name_table_reset(void);
static void name_table_change(const struct rtnetlink_link_change *, void *);
static void name_map_clear(void);
static struct name_node *name_node_lookup(int ifi_index);
+static struct name_node *name_node_lookup_by_ip(ovs_be32 ip);
/* Populates 'name' with the name of the interface traffic destined for 'ip'
* is likely to egress out of (see route_table_get_ifindex).
@@ -100,23 +102,30 @@ static struct name_node *name_node_lookup(int ifi_index);
bool
route_table_get_name(ovs_be32 ip, char name[IFNAMSIZ])
{
- int ifindex;
+ struct name_node *nn = name_node_lookup_by_ip(ip);
- if (!name_table_valid) {
- name_table_reset();
+ if (!nn) {
+ ovs_strlcpy(name, nn->ifname, IFNAMSIZ);
+ return true;
}
- if (route_table_get_ifindex(ip, &ifindex)) {
- struct name_node *nn;
+ return false;
+}
- nn = name_node_lookup(ifindex);
- if (nn) {
- ovs_strlcpy(name, nn->ifname, IFNAMSIZ);
- return true;
- }
+/* Returns the MTU of the interface traffic destined for 'ip'
+ * is likely to egress out of (see route_table_get_ifindex).
+ *
+ * Returns a the MTU if successful, otherwise 0. */
+int
+route_table_get_mtu(ovs_be32 ip)
+{
+ struct name_node *nn = name_node_lookup_by_ip(ip);
+
+ if (nn && nn->mtu > 0) {
+ return nn->mtu;
}
- return false;
+ return 0;
}
/* Populates 'ifindex' with the interface index traffic destined for 'ip' is
@@ -450,6 +459,7 @@ name_table_reset(void)
nn = xzalloc(sizeof *nn);
nn->ifi_index = change.ifi_index;
+ nn->mtu = change.mtu;
ovs_strlcpy(nn->ifname, change.ifname, IFNAMSIZ);
hmap_insert(&name_map, &nn->node, hash_int(nn->ifi_index, 0));
}
@@ -482,6 +492,27 @@ name_node_lookup(int ifi_index)
return NULL;
}
+static struct name_node *
+name_node_lookup_by_ip(ovs_be32 ip)
+{
+ int ifindex;
+
+ if (!name_table_valid) {
+ name_table_reset();
+ }
+
+ if (route_table_get_ifindex(ip, &ifindex)) {
+ struct name_node *nn;
+
+ nn = name_node_lookup(ifindex);
+ if (nn) {
+ return nn;
+ }
+ }
+
+ return NULL;
+}
+
static void
name_map_clear(void)
{
diff --git a/lib/route-table.h b/lib/route-table.h
index 1479249..264c199 100644
--- a/lib/route-table.h
+++ b/lib/route-table.h
@@ -25,6 +25,7 @@
bool route_table_get_ifindex(ovs_be32 ip, int *ifindex);
bool route_table_get_name(ovs_be32 ip, char name[IFNAMSIZ]);
+int route_table_get_mtu(ovs_be32 ip);
void route_table_register(void);
void route_table_unregister(void);
void route_table_run(void);
--
1.7.10.2.484.gcd07cc5
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