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ipvlan: implement VEPA mode

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This is very similar to the Macvlan VEPA mode, however, there is some
difference. IPvlan uses the mac-address of the lower device, so the VEPA
mode has implications of ICMP-redirects for packets destined for its
immediate neighbors sharing same master since the packets will have same
source and dest mac. The external switch/router will send redirect msg.

Having said that, this will be useful tool in terms of debugging
since IPvlan will not switch packets within its slaves and rely completely
on the external entity as intended in 802.1Qbg.

Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mahesh Bandewar
2017-10-26 15:09:25 -07:00
committed by David S. Miller
parent a190d04db9
commit fe89aa6b25
5 changed files with 48 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/net/ipvlan/ipvlan.h
View File

@@ -139,6 +139,21 @@ static inline void ipvlan_clear_private(struct ipvl_port *port)
port->flags &= ~IPVLAN_F_PRIVATE;
}
static inline bool ipvlan_is_vepa(const struct ipvl_port *port)
{
return !!(port->flags & IPVLAN_F_VEPA);
}
static inline void ipvlan_mark_vepa(struct ipvl_port *port)
{
port->flags |= IPVLAN_F_VEPA;
}
static inline void ipvlan_clear_vepa(struct ipvl_port *port)
{
port->flags &= ~IPVLAN_F_VEPA;
}
void ipvlan_init_secret(void);
unsigned int ipvlan_mac_hash(const unsigned char *addr);
rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb);

17
drivers/net/ipvlan/ipvlan_core.c
View File

@@ -514,13 +514,15 @@ static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
if (!lyr3h)
goto out;
addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
if (addr) {
if (ipvlan_is_private(ipvlan->port)) {
consume_skb(skb);
return NET_XMIT_DROP;
if (!ipvlan_is_vepa(ipvlan->port)) {
addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
if (addr) {
if (ipvlan_is_private(ipvlan->port)) {
consume_skb(skb);
return NET_XMIT_DROP;
}
return ipvlan_rcv_frame(addr, &skb, true);
}
return ipvlan_rcv_frame(addr, &skb, true);
}
out:
ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
@@ -535,7 +537,8 @@ static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
void *lyr3h;
int addr_type;
if (ether_addr_equal(eth->h_dest, eth->h_source)) {
if (!ipvlan_is_vepa(ipvlan->port) &&
ether_addr_equal(eth->h_dest, eth->h_source)) {
lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
if (lyr3h) {
addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);

13
drivers/net/ipvlan/ipvlan_main.c
View File

@@ -478,6 +478,11 @@ static int ipvlan_nl_changelink(struct net_device *dev,
ipvlan_mark_private(port);
else
ipvlan_clear_private(port);
if (flags & IPVLAN_F_VEPA)
ipvlan_mark_vepa(port);
else
ipvlan_clear_vepa(port);
}
return err;
@@ -506,8 +511,12 @@ static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
if (data[IFLA_IPVLAN_FLAGS]) {
u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
/* Only one bit is used at this moment. */
if (flags & ~IPVLAN_F_PRIVATE)
/* Only two bits are used at this moment. */
if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
return -EINVAL;
/* Also both flags can't be active at the same time. */
if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
return -EINVAL;
}