From: Stephen Hemminger <shemminger@vyatta•com>
To: "David S. Miller" <davem@davemloft•net>
Cc: netdev@vger•kernel.org
Subject: [PATCH 5/7] bridge: allow creating/deleting fdb entries via netlink
Date: Mon, 04 Apr 2011 17:03:31 -0700 [thread overview]
Message-ID: <20110405000537.372602366@vyatta.com> (raw)
In-Reply-To: 20110405000326.714524584@vyatta.com
[-- Attachment #1: br-fdb-newneigh.patch --]
[-- Type: text/plain, Size: 5105 bytes --]
Use RTM_NEWNEIGH and RTM_DELNEIGH to allow updating of entries
in bridge forwarding table. This allows manipulating static entries
which is not possible with existing tools.
Example (using bridge extensions to iproute2)
# br fdb add 00:02:03:04:05:06 dev eth0
Signed-off-by: Stephen Hemminger <shemminger@vyatta•com>
---
net/bridge/br_fdb.c | 139 ++++++++++++++++++++++++++++++++++++++++++++++++
net/bridge/br_netlink.c | 3 +
net/bridge/br_private.h | 2
3 files changed, 144 insertions(+)
--- a/net/bridge/br_fdb.c 2011-03-22 10:25:00.329008182 -0700
+++ b/net/bridge/br_fdb.c 2011-03-22 10:25:01.057042585 -0700
@@ -555,3 +555,142 @@ skip:
return skb->len;
}
+
+/* Create new static fdb entry */
+static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
+ __u16 state)
+{
+ struct net_bridge *br = source->br;
+ struct hlist_head *head = &br->hash[br_mac_hash(addr)];
+ struct net_bridge_fdb_entry *fdb;
+
+ fdb = fdb_find(head, addr);
+ if (fdb)
+ return -EEXIST;
+
+ fdb = fdb_create(head, source, addr);
+ if (!fdb)
+ return -ENOMEM;
+
+ if (state & NUD_PERMANENT)
+ fdb->is_local = fdb->is_static = 1;
+ else if (state & NUD_NOARP)
+ fdb->is_static = 1;
+ return 0;
+}
+
+/* Add new permanent fdb entry with RTM_NEWNEIGH */
+int br_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct net *net = sock_net(skb->sk);
+ struct ndmsg *ndm;
+ struct nlattr *tb[NDA_MAX+1];
+ struct net_device *dev;
+ struct net_bridge_port *p;
+ const __u8 *addr;
+ int err;
+
+ ASSERT_RTNL();
+ err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
+ if (err < 0)
+ return err;
+
+ ndm = nlmsg_data(nlh);
+ if (ndm->ndm_ifindex == 0) {
+ pr_info("bridge: RTM_NEWNEIGH with invalid ifindex\n");
+ return -EINVAL;
+ }
+
+ dev = __dev_get_by_index(net, ndm->ndm_ifindex);
+ if (dev == NULL) {
+ pr_info("bridge: RTM_NEWNEIGH with unknown ifindex\n");
+ return -ENODEV;
+ }
+
+ if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
+ pr_info("bridge: RTM_NEWNEIGH with invalid address\n");
+ return -EINVAL;
+ }
+
+ addr = nla_data(tb[NDA_LLADDR]);
+ if (!is_valid_ether_addr(addr)) {
+ pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
+ return -EINVAL;
+ }
+
+ p = br_port_get_rtnl(dev);
+ if (p == NULL) {
+ pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
+ dev->name);
+ return -EINVAL;
+ }
+
+ spin_lock_bh(&p->br->hash_lock);
+ err = fdb_add_entry(p, addr, ndm->ndm_state);
+ spin_unlock_bh(&p->br->hash_lock);
+
+ return err;
+}
+
+static int fdb_delete_by_addr(struct net_bridge_port *p, const u8 *addr)
+{
+ struct net_bridge *br = p->br;
+ struct hlist_head *head = &br->hash[br_mac_hash(addr)];
+ struct net_bridge_fdb_entry *fdb;
+
+ fdb = fdb_find(head, addr);
+ if (!fdb)
+ return -ENOENT;
+
+ fdb_delete(fdb);
+ return 0;
+}
+
+/* Remove neighbor entry with RTM_DELNEIGH */
+int br_fdb_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct net *net = sock_net(skb->sk);
+ struct ndmsg *ndm;
+ struct net_bridge_port *p;
+ struct nlattr *llattr;
+ const __u8 *addr;
+ struct net_device *dev;
+ int err;
+
+ ASSERT_RTNL();
+ if (nlmsg_len(nlh) < sizeof(*ndm))
+ return -EINVAL;
+
+ ndm = nlmsg_data(nlh);
+ if (ndm->ndm_ifindex == 0) {
+ pr_info("bridge: RTM_DELNEIGH with invalid ifindex\n");
+ return -EINVAL;
+ }
+
+ dev = __dev_get_by_index(net, ndm->ndm_ifindex);
+ if (dev == NULL) {
+ pr_info("bridge: RTM_DELNEIGH with unknown ifindex\n");
+ return -ENODEV;
+ }
+
+ llattr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_LLADDR);
+ if (llattr == NULL || nla_len(llattr) != ETH_ALEN) {
+ pr_info("bridge: RTM_DELNEIGH with invalid address\n");
+ return -EINVAL;
+ }
+
+ addr = nla_data(llattr);
+
+ p = br_port_get_rtnl(dev);
+ if (p == NULL) {
+ pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
+ dev->name);
+ return -EINVAL;
+ }
+
+ spin_lock_bh(&p->br->hash_lock);
+ err = fdb_delete_by_addr(p, addr);
+ spin_unlock_bh(&p->br->hash_lock);
+
+ return err;
+}
--- a/net/bridge/br_netlink.c 2011-03-22 10:25:00.329008182 -0700
+++ b/net/bridge/br_netlink.c 2011-03-22 10:25:01.057042585 -0700
@@ -196,6 +196,9 @@ int __init br_netlink_init(void)
/* Only the first call to __rtnl_register can fail */
__rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL);
+
+ __rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, br_fdb_add, NULL);
+ __rtnl_register(PF_BRIDGE, RTM_DELNEIGH, br_fdb_delete, NULL);
__rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, br_fdb_dump);
return 0;
--- a/net/bridge/br_private.h 2011-03-22 10:25:00.329008182 -0700
+++ b/net/bridge/br_private.h 2011-03-22 10:25:01.057042585 -0700
@@ -355,6 +355,8 @@ extern void br_fdb_update(struct net_bri
struct net_bridge_port *source,
const unsigned char *addr);
extern int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb);
+extern int br_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
+extern int br_fdb_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
/* br_forward.c */
extern void br_deliver(const struct net_bridge_port *to,
next prev parent reply other threads:[~2011-04-05 0:09 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-05 0:03 [PATCH 0/7] bridge enhancements for net-next Stephen Hemminger
2011-04-05 0:03 ` [PATCH 1/7] bridge: change arguments to fdb_create Stephen Hemminger
2011-04-05 0:03 ` [PATCH 2/7] bridge: track last used time in forwarding table Stephen Hemminger
2011-04-05 0:03 ` [PATCH 3/7] bridge: split rcu and no-rcu cases of fdb lookup Stephen Hemminger
2011-04-05 0:03 ` [PATCH 4/7] bridge: add netlink notification on forward entry changes Stephen Hemminger
2011-04-05 0:03 ` Stephen Hemminger [this message]
2011-10-05 19:06 ` [PATCH 5/7] bridge: allow creating/deleting fdb entries via netlink Kevin Wilson
2011-10-05 19:13 ` Stephen Hemminger
2011-10-05 19:36 ` Ben Hutchings
2011-04-05 0:03 ` [PATCH 6/7] bridge: allow creating bridge devices with netlink Stephen Hemminger
2011-04-05 0:03 ` [PATCH 7/7] bridge: range check STP parameters Stephen Hemminger
2011-04-05 0:23 ` [PATCH 0/7] bridge enhancements for net-next David Miller
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