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bridge: vlan dst_metadata hooks in ingress and egress paths
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- ingress hook:
    - if port is a tunnel port, use tunnel info in
      attached dst_metadata to map it to a local vlan
- egress hook:
    - if port is a tunnel port, use tunnel info attached to
      vlan to set dst_metadata on the skb

CC: Nikolay Aleksandrov <[email protected]>
Signed-off-by: Roopa Prabhu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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roopa-prabhu authored and davem330 committed Feb 3, 2017
1 parent efa5356 commit 11538d0
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Showing 6 changed files with 82 additions and 2 deletions.
2 changes: 1 addition & 1 deletion net/bridge/br_forward.c
Original file line number Diff line number Diff line change
Expand Up @@ -80,7 +80,7 @@ static void __br_forward(const struct net_bridge_port *to,
int br_hook;

vg = nbp_vlan_group_rcu(to);
skb = br_handle_vlan(to->br, vg, skb);
skb = br_handle_vlan(to->br, to, vg, skb);
if (!skb)
return;

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8 changes: 7 additions & 1 deletion net/bridge/br_input.c
Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@
#include <linux/export.h>
#include <linux/rculist.h>
#include "br_private.h"
#include "br_private_tunnel.h"

/* Hook for brouter */
br_should_route_hook_t __rcu *br_should_route_hook __read_mostly;
Expand Down Expand Up @@ -57,7 +58,7 @@ static int br_pass_frame_up(struct sk_buff *skb)

indev = skb->dev;
skb->dev = brdev;
skb = br_handle_vlan(br, vg, skb);
skb = br_handle_vlan(br, NULL, vg, skb);
if (!skb)
return NET_RX_DROP;
/* update the multicast stats if the packet is IGMP/MLD */
Expand Down Expand Up @@ -261,6 +262,11 @@ rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
return RX_HANDLER_CONSUMED;

p = br_port_get_rcu(skb->dev);
if (p->flags & BR_VLAN_TUNNEL) {
if (br_handle_ingress_vlan_tunnel(skb, p,
nbp_vlan_group_rcu(p)))
goto drop;
}

if (unlikely(is_link_local_ether_addr(dest))) {
u16 fwd_mask = p->br->group_fwd_mask_required;
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2 changes: 2 additions & 0 deletions net/bridge/br_private.h
Original file line number Diff line number Diff line change
Expand Up @@ -775,6 +775,7 @@ bool br_allowed_egress(struct net_bridge_vlan_group *vg,
const struct sk_buff *skb);
bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
struct sk_buff *br_handle_vlan(struct net_bridge *br,
const struct net_bridge_port *port,
struct net_bridge_vlan_group *vg,
struct sk_buff *skb);
int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
Expand Down Expand Up @@ -874,6 +875,7 @@ static inline bool br_should_learn(struct net_bridge_port *p,
}

static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
const struct net_bridge_port *port,
struct net_bridge_vlan_group *vg,
struct sk_buff *skb)
{
Expand Down
11 changes: 11 additions & 0 deletions net/bridge/br_private_tunnel.h
Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,11 @@ int nbp_vlan_tunnel_info_add(struct net_bridge_port *port, u16 vid, u32 tun_id);
void nbp_vlan_tunnel_info_flush(struct net_bridge_port *port);
void vlan_tunnel_info_del(struct net_bridge_vlan_group *vg,
struct net_bridge_vlan *vlan);
int br_handle_ingress_vlan_tunnel(struct sk_buff *skb,
struct net_bridge_port *p,
struct net_bridge_vlan_group *vg);
int br_handle_egress_vlan_tunnel(struct sk_buff *skb,
struct net_bridge_vlan *vlan);
#else
static inline int vlan_tunnel_init(struct net_bridge_vlan_group *vg)
{
Expand Down Expand Up @@ -67,6 +72,12 @@ static inline void vlan_tunnel_info_del(struct net_bridge_vlan_group *vg,
{
}

static inline int br_handle_ingress_vlan_tunnel(struct sk_buff *skb,
struct net_bridge_port *p,
struct net_bridge_vlan_group *vg)
{
return 0;
}
#endif

#endif
7 changes: 7 additions & 0 deletions net/bridge/br_vlan.c
Original file line number Diff line number Diff line change
Expand Up @@ -341,6 +341,7 @@ static void __vlan_flush(struct net_bridge_vlan_group *vg)
}

struct sk_buff *br_handle_vlan(struct net_bridge *br,
const struct net_bridge_port *p,
struct net_bridge_vlan_group *vg,
struct sk_buff *skb)
{
Expand Down Expand Up @@ -381,6 +382,12 @@ struct sk_buff *br_handle_vlan(struct net_bridge *br,

if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
skb->vlan_tci = 0;

if (p && (p->flags & BR_VLAN_TUNNEL) &&
br_handle_egress_vlan_tunnel(skb, v)) {
kfree_skb(skb);
return NULL;
}
out:
return skb;
}
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54 changes: 54 additions & 0 deletions net/bridge/br_vlan_tunnel.c
Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,13 @@ static const struct rhashtable_params br_vlan_tunnel_rht_params = {
.automatic_shrinking = true,
};

static struct net_bridge_vlan *br_vlan_tunnel_lookup(struct rhashtable *tbl,
u64 tunnel_id)
{
return rhashtable_lookup_fast(tbl, &tunnel_id,
br_vlan_tunnel_rht_params);
}

void vlan_tunnel_info_del(struct net_bridge_vlan_group *vg,
struct net_bridge_vlan *vlan)
{
Expand Down Expand Up @@ -147,3 +154,50 @@ void vlan_tunnel_deinit(struct net_bridge_vlan_group *vg)
{
rhashtable_destroy(&vg->tunnel_hash);
}

int br_handle_ingress_vlan_tunnel(struct sk_buff *skb,
struct net_bridge_port *p,
struct net_bridge_vlan_group *vg)
{
struct ip_tunnel_info *tinfo = skb_tunnel_info(skb);
struct net_bridge_vlan *vlan;

if (!vg || !tinfo)
return 0;

/* if already tagged, ignore */
if (skb_vlan_tagged(skb))
return 0;

/* lookup vid, given tunnel id */
vlan = br_vlan_tunnel_lookup(&vg->tunnel_hash, tinfo->key.tun_id);
if (!vlan)
return 0;

skb_dst_drop(skb);

__vlan_hwaccel_put_tag(skb, p->br->vlan_proto, vlan->vid);

return 0;
}

int br_handle_egress_vlan_tunnel(struct sk_buff *skb,
struct net_bridge_vlan *vlan)
{
int err;

if (!vlan || !vlan->tinfo.tunnel_id)
return 0;

if (unlikely(!skb_vlan_tag_present(skb)))
return 0;

skb_dst_drop(skb);
err = skb_vlan_pop(skb);
if (err)
return err;

skb_dst_set(skb, dst_clone(&vlan->tinfo.tunnel_dst->dst));

return 0;
}

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