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authorJethro Beekman <kernel@jbeekman.nl>2021-04-25 11:22:03 +0200
committerDavid S. Miller <davem@davemloft.net>2021-04-25 18:35:01 -0700
commit427f0c8c194b22edcafef1b0a42995ddc5c2227d (patch)
treeb951db0ad2e9ab59002c76d2d9f4fc8ac8e93a2e /drivers/net/macvlan.c
parent1e5e4acb66ed8f337e60bb1b15b46cc91361d181 (diff)
downloadlinux-427f0c8c194b22edcafef1b0a42995ddc5c2227d.tar.bz2
macvlan: Add nodst option to macvlan type source
The default behavior for source MACVLAN is to duplicate packets to appropriate type source devices, and then do the normal destination MACVLAN flow. This patch adds an option to skip destination MACVLAN processing if any matching source MACVLAN device has the option set. This allows setting up a "catch all" device for source MACVLAN: create one or more devices with type source nodst, and one device with e.g. type vepa, and incoming traffic will be received on exactly one device. v2: netdev wants non-standard line length Signed-off-by: Jethro Beekman <kernel@jbeekman.nl> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/macvlan.c')
-rw-r--r--drivers/net/macvlan.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 9a9a5cf36a4b..7427b989607e 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -423,18 +423,24 @@ static void macvlan_forward_source_one(struct sk_buff *skb,
macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
}
-static void macvlan_forward_source(struct sk_buff *skb,
+static bool macvlan_forward_source(struct sk_buff *skb,
struct macvlan_port *port,
const unsigned char *addr)
{
struct macvlan_source_entry *entry;
u32 idx = macvlan_eth_hash(addr);
struct hlist_head *h = &port->vlan_source_hash[idx];
+ bool consume = false;
hlist_for_each_entry_rcu(entry, h, hlist) {
- if (ether_addr_equal_64bits(entry->addr, addr))
+ if (ether_addr_equal_64bits(entry->addr, addr)) {
+ if (entry->vlan->flags & MACVLAN_FLAG_NODST)
+ consume = true;
macvlan_forward_source_one(skb, entry->vlan);
+ }
}
+
+ return consume;
}
/* called under rcu_read_lock() from netif_receive_skb */
@@ -463,7 +469,8 @@ static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
return RX_HANDLER_CONSUMED;
*pskb = skb;
eth = eth_hdr(skb);
- macvlan_forward_source(skb, port, eth->h_source);
+ if (macvlan_forward_source(skb, port, eth->h_source))
+ return RX_HANDLER_CONSUMED;
src = macvlan_hash_lookup(port, eth->h_source);
if (src && src->mode != MACVLAN_MODE_VEPA &&
src->mode != MACVLAN_MODE_BRIDGE) {
@@ -482,7 +489,8 @@ static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
return RX_HANDLER_PASS;
}
- macvlan_forward_source(skb, port, eth->h_source);
+ if (macvlan_forward_source(skb, port, eth->h_source))
+ return RX_HANDLER_CONSUMED;
if (macvlan_passthru(port))
vlan = list_first_or_null_rcu(&port->vlans,
struct macvlan_dev, list);
@@ -1286,7 +1294,8 @@ static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
return 0;
if (data[IFLA_MACVLAN_FLAGS] &&
- nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
+ nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC |
+ MACVLAN_FLAG_NODST))
return -EINVAL;
if (data[IFLA_MACVLAN_MODE]) {