@@ -2355,11 +2355,13 @@ static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
!(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
struct vxlan_dev *dst_vxlan;
- dst_release(dst);
dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
daddr->sa.sa_family, dst_port,
vxlan->cfg.flags);
if (!dst_vxlan) {
+ if (!(vxlan->cfg.flags & VXLAN_F_LOCALBYPASS))
+ return 0;
+ dst_release(dst);
dev->stats.tx_errors++;
vxlan_vnifilter_count(vxlan, vni, NULL,
VXLAN_VNI_STATS_TX_ERRORS, 0);
@@ -2367,6 +2369,7 @@ static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
return -ENOENT;
}
+ dst_release(dst);
vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true);
return 1;
}
@@ -2568,7 +2571,6 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
if (!info) {
u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
-
err = encap_bypass_if_local(skb, dev, vxlan, dst,
dst_port, ifindex, vni,
ndst, rt6i_flags);
@@ -3172,6 +3174,7 @@ static void vxlan_raw_setup(struct net_device *dev)
}
static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
+ [IFLA_VXLAN_UNSPEC] = { .strict_start_type = IFLA_VXLAN_LOCALBYPASS },
[IFLA_VXLAN_ID] = { .type = NLA_U32 },
[IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) },
[IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
@@ -3202,6 +3205,7 @@ static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
[IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
[IFLA_VXLAN_DF] = { .type = NLA_U8 },
[IFLA_VXLAN_VNIFILTER] = { .type = NLA_U8 },
+ [IFLA_VXLAN_LOCALBYPASS] = NLA_POLICY_MAX(NLA_U8, 1),
};
static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
@@ -4011,6 +4015,17 @@ static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
}
+ if (data[IFLA_VXLAN_LOCALBYPASS]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LOCALBYPASS,
+ VXLAN_F_LOCALBYPASS, changelink,
+ true, extack);
+ if (err)
+ return err;
+ } else if (!changelink) {
+ /* default to local bypass on a new device */
+ conf->flags |= VXLAN_F_LOCALBYPASS;
+ }
+
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
@@ -4232,6 +4247,7 @@ static size_t vxlan_get_size(const struct net_device *dev)
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LOCALBYPASS */
0;
}
@@ -4308,7 +4324,9 @@ static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
!!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
- !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
+ !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)) ||
+ nla_put_u8(skb, IFLA_VXLAN_LOCALBYPASS,
+ !!(vxlan->cfg.flags & VXLAN_F_LOCALBYPASS)))
goto nla_put_failure;
if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
@@ -328,6 +328,7 @@ struct vxlan_dev {
#define VXLAN_F_TTL_INHERIT 0x10000
#define VXLAN_F_VNIFILTER 0x20000
#define VXLAN_F_MDB 0x40000
+#define VXLAN_F_LOCALBYPASS 0x80000
/* Flags that are used in the receive path. These flags must match in
* order for a socket to be shareable
@@ -348,7 +349,8 @@ struct vxlan_dev {
VXLAN_F_UDP_ZERO_CSUM6_TX | \
VXLAN_F_UDP_ZERO_CSUM6_RX | \
VXLAN_F_COLLECT_METADATA | \
- VXLAN_F_VNIFILTER)
+ VXLAN_F_VNIFILTER | \
+ VXLAN_F_LOCALBYPASS)
struct net_device *vxlan_dev_create(struct net *net, const char *name,
u8 name_assign_type, struct vxlan_config *conf);
@@ -828,6 +828,7 @@ enum {
IFLA_VXLAN_TTL_INHERIT,
IFLA_VXLAN_DF,
IFLA_VXLAN_VNIFILTER, /* only applicable with COLLECT_METADATA mode */
+ IFLA_VXLAN_LOCALBYPASS,
__IFLA_VXLAN_MAX
};
#define IFLA_VXLAN_MAX (__IFLA_VXLAN_MAX - 1)
If a packet needs to be encapsulated towards a local destination IP and a VXLAN device that matches the destination port and VNI exists, then the packet will be injected into the Rx path as if it was received by the target VXLAN device without undergoing encapsulation. If such a device does not exist, the packet will be dropped. There are scenarios where we do not want to drop such packets and instead want to let them be encapsulated and locally received by a user space program that post-processes these VXLAN packets. To that end, add a new VXLAN device attribute that controls whether such packets are dropped or not. When set ("localbypass") these packets are dropped and when unset ("nolocalbypass") the packets are encapsulated and locally delivered to the listening user space application. Default to "localbypass" to maintain existing behavior. Signed-off-by: Vladimir Nikishkin <vladimir@nikishkin.pw> --- drivers/net/vxlan/vxlan_core.c | 24 +++++++++++++++++++++--- include/net/vxlan.h | 4 +++- include/uapi/linux/if_link.h | 1 + 3 files changed, 25 insertions(+), 4 deletions(-)