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bridge: fix link notification skb size calculation to include vlan ranges

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my previous patch skipped vlan range optimizations during skb size
calculations for simplicity.

This incremental patch considers vlan ranges during
skb size calculations. This leads to a bit of code duplication
in the fill and size calculation functions. But, I could not find a
prettier way to do this. will take any suggestions.

Previously, I had reused the existing br_get_link_af_size size calculation
function to calculate skb size for notifications. Reusing it this time
around creates some change in behaviour issues for the usual
.get_link_af_size callback.

This patch adds a new br_get_link_af_size_filtered() function to
base the size calculation on the incoming filter flag and include
vlan ranges.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Reviewed-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roopa Prabhu 2015-02-25 23:55:40 -08:00 committed by David S. Miller
parent 9003019192
commit fed0a159c8
1 changed files with 85 additions and 7 deletions
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92
net/bridge/br_netlink.c
View File

@ -22,9 +22,64 @@
#include "br_private.h"
#include "br_private_stp.h"
static size_t br_get_link_af_size(const struct net_device *dev)
static int br_get_num_vlan_infos(const struct net_port_vlans *pv,
u32 filter_mask)
{
u16 vid_range_start = 0, vid_range_end = 0;
u16 vid_range_flags = 0;
u16 pvid, vid, flags;
int num_vlans = 0;
if (filter_mask & RTEXT_FILTER_BRVLAN)
return pv->num_vlans;
if (!(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
return 0;
/* Count number of vlan info's
*/
pvid = br_get_pvid(pv);
for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
flags = 0;
if (vid == pvid)
flags |= BRIDGE_VLAN_INFO_PVID;
if (test_bit(vid, pv->untagged_bitmap))
flags |= BRIDGE_VLAN_INFO_UNTAGGED;
if (vid_range_start == 0) {
goto initvars;
} else if ((vid - vid_range_end) == 1 &&
flags == vid_range_flags) {
vid_range_end = vid;
continue;
} else {
if ((vid_range_end - vid_range_start) > 0)
num_vlans += 2;
else
num_vlans += 1;
}
initvars:
vid_range_start = vid;
vid_range_end = vid;
vid_range_flags = flags;
}
if (vid_range_start != 0) {
if ((vid_range_end - vid_range_start) > 0)
num_vlans += 2;
else
num_vlans += 1;
}
return num_vlans;
}
static size_t br_get_link_af_size_filtered(const struct net_device *dev,
u32 filter_mask)
{
struct net_port_vlans *pv;
int num_vlan_infos;
if (br_port_exists(dev))
pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
@ -36,8 +91,12 @@ static size_t br_get_link_af_size(const struct net_device *dev)
if (!pv)
return 0;
num_vlan_infos = br_get_num_vlan_infos(pv, filter_mask);
if (!num_vlan_infos)
return 0;
/* Each VLAN is returned in bridge_vlan_info along with flags */
return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
return num_vlan_infos * nla_total_size(sizeof(struct bridge_vlan_info));
}
static inline size_t br_port_info_size(void)
@ -54,7 +113,7 @@ static inline size_t br_port_info_size(void)
+ 0;
}
static inline size_t br_nlmsg_size(struct net_device *dev)
static inline size_t br_nlmsg_size(struct net_device *dev, u32 filter_mask)
{
return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
@ -64,7 +123,8 @@ static inline size_t br_nlmsg_size(struct net_device *dev)
+ nla_total_size(4) /* IFLA_LINK */
+ nla_total_size(1) /* IFLA_OPERSTATE */
+ nla_total_size(br_port_info_size()) /* IFLA_PROTINFO */
+ nla_total_size(br_get_link_af_size(dev)); /* IFLA_AF_SPEC */
+ nla_total_size(br_get_link_af_size_filtered(dev,
filter_mask)); /* IFLA_AF_SPEC */
}
static int br_port_fill_attrs(struct sk_buff *skb,
@ -299,6 +359,7 @@ void br_ifinfo_notify(int event, struct net_bridge_port *port)
struct net *net;
struct sk_buff *skb;
int err = -ENOBUFS;
u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
if (!port)
return;
@ -307,12 +368,11 @@ void br_ifinfo_notify(int event, struct net_bridge_port *port)
br_debug(port->br, "port %u(%s) event %d\n",
(unsigned int)port->port_no, port->dev->name, event);
skb = nlmsg_new(br_nlmsg_size(port->dev), GFP_ATOMIC);
skb = nlmsg_new(br_nlmsg_size(port->dev, filter), GFP_ATOMIC);
if (skb == NULL)
goto errout;
err = br_fill_ifinfo(skb, port, 0, 0, event, 0,
RTEXT_FILTER_BRVLAN_COMPRESSED, port->dev);
err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, port->dev);
if (err < 0) {
/* -EMSGSIZE implies BUG in br_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
@ -723,6 +783,24 @@ static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
return 0;
}
static size_t br_get_link_af_size(const struct net_device *dev)
{
struct net_port_vlans *pv;
if (br_port_exists(dev))
pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
else if (dev->priv_flags & IFF_EBRIDGE)
pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
else
return 0;
if (!pv)
return 0;
/* Each VLAN is returned in bridge_vlan_info along with flags */
return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
}
static struct rtnl_af_ops br_af_ops __read_mostly = {
.family = AF_BRIDGE,
.get_link_af_size = br_get_link_af_size,