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AP: Add support for IPv4 neighbor entry management to the BSS bridge 

This allows adding/deleting an IPv4 neighbor entry to/from the bridge,
to which the BSS belongs. This commit adds the needed functionality in
driver_nl80211.c for the Linux bridge implementation. In theory, this
could be shared with multiple Linux driver interfaces, but for now, only
the main nl80211 interface is supported.

Signed-off-by: Kyeyoon Park <kyeyoonp@qca.qualcomm.com>
This commit is contained in:
Kyeyoon Park 2014-09-23 23:02:04 -07:00 committed by Jouni Malinen
parent 6c6678e7a4
commit 71103bed42
3 changed files with 180 additions and 0 deletions
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20
src/ap/ap_drv_ops.h
View File

@ -280,6 +280,26 @@ static inline int hostapd_drv_status(struct hostapd_data *hapd, char *buf,
return hapd->driver->status(hapd->drv_priv, buf, buflen);
}
static inline int hostapd_drv_br_add_ip_neigh(struct hostapd_data *hapd,
be32 ipaddr, int prefixlen,
const u8 *addr)
{
if (hapd->driver == NULL || hapd->drv_priv == NULL ||
hapd->driver->br_add_ip_neigh == NULL)
return -1;
return hapd->driver->br_add_ip_neigh(hapd->drv_priv, ipaddr, prefixlen,
addr);
}
static inline int hostapd_drv_br_delete_ip_neigh(struct hostapd_data *hapd,
be32 ipaddr)
{
if (hapd->driver == NULL || hapd->drv_priv == NULL ||
hapd->driver->br_delete_ip_neigh == NULL)
return -1;
return hapd->driver->br_delete_ip_neigh(hapd->drv_priv, ipaddr);
}
static inline int hostapd_drv_vendor_cmd(struct hostapd_data *hapd,
int vendor_id, int subcmd,
const u8 *data, size_t data_len,

19
src/drivers/driver.h
View File

@ -2600,6 +2600,25 @@ struct wpa_driver_ops {
int (*set_qos_map)(void *priv, const u8 *qos_map_set,
u8 qos_map_set_len);
/**
* br_add_ip_neigh - Add a neigh to the bridge ip neigh table
* @priv: Private driver interface data
* @ipaddr: IPv4 address for the neigh entry
* @prefixlen: IPv4 address netmask prefix length
* @addr: Corresponding MAC address
* Returns: 0 on success, negative (<0) on failure
*/
int (*br_add_ip_neigh)(void *priv, be32 ipaddr, int prefixlen,
const u8 *addr);
/**
* br_delete_ip_neigh - Remove a neigh from the bridge ip neigh table
* @priv: Private driver interface data
* @ipaddr: IPv4 address for the neigh entry
* Returns: 0 on success, negative (<0) on failure
*/
int (*br_delete_ip_neigh)(void *priv, be32 ipaddr);
/**
* set_wowlan - Set wake-on-wireless triggers
* @priv: Private driver interface data

141
src/drivers/driver_nl80211.c
View File

@ -8835,6 +8835,145 @@ nla_put_failure:
#endif /* CONFIG_MESH */
static int wpa_driver_br_add_ip_neigh(void *priv, be32 ipaddr,
int prefixlen, const u8 *addr)
{
#ifdef CONFIG_LIBNL3_ROUTE
struct i802_bss *bss = priv;
struct wpa_driver_nl80211_data *drv = bss->drv;
struct rtnl_neigh *rn;
struct nl_addr *nl_ipaddr = NULL;
struct nl_addr *nl_lladdr = NULL;
int res;
if (ipaddr == 0 || prefixlen == 0 || !addr)
return -EINVAL;
if (bss->br_ifindex == 0) {
wpa_printf(MSG_DEBUG,
"nl80211: bridge must be set before adding an ip neigh to it");
return -1;
}
if (!drv->rtnl_sk) {
wpa_printf(MSG_DEBUG,
"nl80211: nl_sock for NETLINK_ROUTE is not initialized");
return -1;
}
rn = rtnl_neigh_alloc();
if (rn == NULL)
return -ENOMEM;
/* set the destination ip address for neigh */
nl_ipaddr = nl_addr_build(AF_INET, &ipaddr, sizeof(ipaddr));
if (nl_ipaddr == NULL) {
wpa_printf(MSG_DEBUG, "nl80211: nl_ipaddr build failed");
res = -ENOMEM;
goto errout;
}
nl_addr_set_prefixlen(nl_ipaddr, prefixlen);
res = rtnl_neigh_set_dst(rn, nl_ipaddr);
if (res) {
wpa_printf(MSG_DEBUG,
"nl80211: neigh set destination addr failed");
goto errout;
}
/* set the corresponding lladdr for neigh */
nl_lladdr = nl_addr_build(AF_BRIDGE, (u8 *) addr, ETH_ALEN);
if (nl_lladdr == NULL) {
wpa_printf(MSG_DEBUG, "nl80211: neigh set lladdr failed");
res = -ENOMEM;
goto errout;
}
rtnl_neigh_set_lladdr(rn, nl_lladdr);
rtnl_neigh_set_ifindex(rn, bss->br_ifindex);
rtnl_neigh_set_state(rn, NUD_PERMANENT);
res = rtnl_neigh_add(drv->rtnl_sk, rn, NLM_F_CREATE);
if (res) {
wpa_printf(MSG_DEBUG,
"nl80211: Adding bridge ip neigh failed: %s",
strerror(errno));
}
errout:
if (nl_lladdr)
nl_addr_put(nl_lladdr);
if (nl_ipaddr)
nl_addr_put(nl_ipaddr);
if (rn)
rtnl_neigh_put(rn);
return res;
#else /* CONFIG_LIBNL3_ROUTE */
return -1;
#endif /* CONFIG_LIBNL3_ROUTE */
}
static int wpa_driver_br_delete_ip_neigh(void *priv, be32 ipaddr)
{
#ifdef CONFIG_LIBNL3_ROUTE
struct i802_bss *bss = priv;
struct wpa_driver_nl80211_data *drv = bss->drv;
struct rtnl_neigh *rn;
struct nl_addr *nl_ipaddr;
int res;
if (ipaddr == 0)
return -EINVAL;
if (bss->br_ifindex == 0) {
wpa_printf(MSG_DEBUG,
"nl80211: bridge must be set to delete an ip neigh");
return -1;
}
if (!drv->rtnl_sk) {
wpa_printf(MSG_DEBUG,
"nl80211: nl_sock for NETLINK_ROUTE is not initialized");
return -1;
}
rn = rtnl_neigh_alloc();
if (rn == NULL)
return -ENOMEM;
/* set the destination ip address for neigh */
nl_ipaddr = nl_addr_build(AF_INET, &ipaddr, sizeof(ipaddr));
if (nl_ipaddr == NULL) {
wpa_printf(MSG_DEBUG, "nl80211: nl_ipaddr build failed");
res = -ENOMEM;
goto errout;
}
res = rtnl_neigh_set_dst(rn, nl_ipaddr);
if (res) {
wpa_printf(MSG_DEBUG,
"nl80211: neigh set destination addr failed");
goto errout;
}
rtnl_neigh_set_ifindex(rn, bss->br_ifindex);
res = rtnl_neigh_delete(drv->rtnl_sk, rn, 0);
if (res) {
wpa_printf(MSG_DEBUG,
"nl80211: Deleting bridge ip neigh failed: %s",
strerror(errno));
}
errout:
if (nl_ipaddr)
nl_addr_put(nl_ipaddr);
if (rn)
rtnl_neigh_put(rn);
return res;
#else /* CONFIG_LIBNL3_ROUTE */
return -1;
#endif /* CONFIG_LIBNL3_ROUTE */
}
const struct wpa_driver_ops wpa_driver_nl80211_ops = {
.name = "nl80211",
.desc = "Linux nl80211/cfg80211",
@ -8933,4 +9072,6 @@ const struct wpa_driver_ops wpa_driver_nl80211_ops = {
.join_mesh = wpa_driver_nl80211_join_mesh,
.leave_mesh = wpa_driver_nl80211_leave_mesh,
#endif /* CONFIG_MESH */
.br_add_ip_neigh = wpa_driver_br_add_ip_neigh,
.br_delete_ip_neigh = wpa_driver_br_delete_ip_neigh,
};