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authorVladimir Nikishkin <vladimir@nikishkin.pw>2023-05-12 06:40:33 +0300
committerDavid S. Miller <davem@davemloft.net>2023-05-13 19:02:33 +0300
commit69474a8a5837be63f13c6f60a7d622b98ed5c539 (patch)
tree82cff7f3e374b31c188fc582bfbf876f7cc6aade /drivers/net/vxlan
parent7eef636ecc58b3bf330cd25d9129e2f2d379a65a (diff)
downloadlinux-69474a8a5837be63f13c6f60a7d622b98ed5c539.tar.xz
net: vxlan: Add nolocalbypass option to vxlan.
If a packet needs to be encapsulated towards a local destination IP, the packet will undergo a "local bypass" and 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 perform such a bypass, but instead want the packet to be encapsulated and locally received by a user space program for post-processing. To that end, add a new VXLAN device attribute that controls whether a "local bypass" is performed or not. Default to performing a bypass to maintain existing behavior. Signed-off-by: Vladimir Nikishkin <vladimir@nikishkin.pw> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/vxlan')
-rw-r--r--drivers/net/vxlan/vxlan_core.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 561fe1b314f5..78744549c1b3 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -2352,7 +2352,8 @@ static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
#endif
/* Bypass encapsulation if the destination is local */
if (rt_flags & RTCF_LOCAL &&
- !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
+ !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) &&
+ vxlan->cfg.flags & VXLAN_F_LOCALBYPASS) {
struct vxlan_dev *dst_vxlan;
dst_release(dst);
@@ -3172,6 +3173,7 @@ 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 +3204,7 @@ 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 +4014,17 @@ 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 +4246,7 @@ 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 +4323,9 @@ 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))