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net: generic fdb support for drivers without ndo_fdb_<op> 

If the driver does not support the ndo_op use the generic
handler for it. This should work in the majority of cases.
Eventually the fdb_dflt_add call gets translated into a
__dev_set_rx_mode() call which should handle hardware
support for filtering via the IFF_UNICAST_FLT flag.

Namely IFF_UNICAST_FLT indicates if the hardware can do
unicast address filtering. If no support is available
the device is put into promisc mode.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich 2013-03-06 15:39:42 +00:00 committed by David S. Miller
parent 6906f4ed6f
commit 090096bf3d
2 changed files with 84 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/linux/rtnetlink.h
View File

@ -69,6 +69,15 @@ extern int ndo_dflt_fdb_dump(struct sk_buff *skb,
struct netlink_callback *cb,
struct net_device *dev,
int idx);
extern int ndo_dflt_fdb_add(struct ndmsg *ndm,
struct nlattr *tb[],
struct net_device *dev,
const unsigned char *addr,
u16 flags);
extern int ndo_dflt_fdb_del(struct ndmsg *ndm,
struct nlattr *tb[],
struct net_device *dev,
const unsigned char *addr);
extern int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
struct net_device *dev, u16 mode);

81
net/core/rtnetlink.c
View File

@ -2048,6 +2048,38 @@ errout:
rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
}
/**
* ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
*/
int ndo_dflt_fdb_add(struct ndmsg *ndm,
struct nlattr *tb[],
struct net_device *dev,
const unsigned char *addr,
u16 flags)
{
int err = -EINVAL;
/* If aging addresses are supported device will need to
* implement its own handler for this.
*/
if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
pr_info("%s: FDB only supports static addresses\n", dev->name);
return err;
}
if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
err = dev_uc_add_excl(dev, addr);
else if (is_multicast_ether_addr(addr))
err = dev_mc_add_excl(dev, addr);
/* Only return duplicate errors if NLM_F_EXCL is set */
if (err == -EEXIST && !(flags & NLM_F_EXCL))
err = 0;
return err;
}
EXPORT_SYMBOL(ndo_dflt_fdb_add);
static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
struct net *net = sock_net(skb->sk);
@ -2100,10 +2132,13 @@ static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
}
/* Embedded bridge, macvlan, and any other device support */
if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_add) {
err = dev->netdev_ops->ndo_fdb_add(ndm, tb,
dev, addr,
nlh->nlmsg_flags);
if ((ndm->ndm_flags & NTF_SELF)) {
if (dev->netdev_ops->ndo_fdb_add)
err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
nlh->nlmsg_flags);
else
err = ndo_dflt_fdb_add(ndm, tb, dev, addr,
nlh->nlmsg_flags);
if (!err) {
rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
@ -2114,6 +2149,35 @@ out:
return err;
}
/**
* ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
*/
int ndo_dflt_fdb_del(struct ndmsg *ndm,
struct nlattr *tb[],
struct net_device *dev,
const unsigned char *addr)
{
int err = -EOPNOTSUPP;
/* If aging addresses are supported device will need to
* implement its own handler for this.
*/
if (ndm->ndm_state & NUD_PERMANENT) {
pr_info("%s: FDB only supports static addresses\n", dev->name);
return -EINVAL;
}
if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
err = dev_uc_del(dev, addr);
else if (is_multicast_ether_addr(addr))
err = dev_mc_del(dev, addr);
else
err = -EINVAL;
return err;
}
EXPORT_SYMBOL(ndo_dflt_fdb_del);
static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
struct net *net = sock_net(skb->sk);
@ -2171,8 +2235,11 @@ static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
}
/* Embedded bridge, macvlan, and any other device support */
if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_del) {
err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr);
if (ndm->ndm_flags & NTF_SELF) {
if (dev->netdev_ops->ndo_fdb_del)
err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr);
else
err = ndo_dflt_fdb_del(ndm, tb, dev, addr);
if (!err) {
rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
@ -2257,6 +2324,8 @@ static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
if (dev->netdev_ops->ndo_fdb_dump)
idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx);
else
ndo_dflt_fdb_dump(skb, cb, dev, idx);
}
rcu_read_unlock();