support for tunnelling different L3 protocols like MPLS, IP, NSH etc. inside
a UDP tunnel.
+Special Handling
+----------------
+The bareudp device supports special handling for MPLS & IP as they can have
+multiple ethertypes.
+MPLS procotcol can have ethertypes ETH_P_MPLS_UC (unicast) & ETH_P_MPLS_MC (multicast).
+IP protocol can have ethertypes ETH_P_IP (v4) & ETH_P_IPV6 (v6).
+This special handling can be enabled only for ethertypes ETH_P_IP & ETH_P_MPLS_UC
+with a flag called multiproto mode.
+
Usage
------
b) ip link delete bareudp0
-2) Device Usage
+2) Device creation with multiple proto mode enabled
+
+There are two ways to create a bareudp device for MPLS & IP with multiproto mode
+enabled.
+
+ a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype 0x8847 multiproto
+
+ b) ip link add dev bareudp0 type bareudp dstport 6635 ethertype mpls
+
+3) Device Usage
The bareudp device could be used along with OVS or flower filter in TC.
The OVS or TC flower layer must set the tunnel information in SKB dst field before
__be16 ethertype;
__be16 port;
u16 sport_min;
+ bool multi_proto_mode;
struct socket __rcu *sock;
struct list_head next; /* bareudp node on namespace list */
struct gro_cells gro_cells;
else
family = AF_INET6;
- proto = bareudp->ethertype;
+ if (bareudp->ethertype == htons(ETH_P_IP)) {
+ struct iphdr *iphdr;
+
+ iphdr = (struct iphdr *)(skb->data + BAREUDP_BASE_HLEN);
+ if (iphdr->version == 4) {
+ proto = bareudp->ethertype;
+ } else if (bareudp->multi_proto_mode && (iphdr->version == 6)) {
+ proto = htons(ETH_P_IPV6);
+ } else {
+ bareudp->dev->stats.rx_dropped++;
+ goto drop;
+ }
+ } else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) {
+ struct iphdr *tunnel_hdr;
+
+ tunnel_hdr = (struct iphdr *)skb_network_header(skb);
+ if (tunnel_hdr->version == 4) {
+ if (!ipv4_is_multicast(tunnel_hdr->daddr)) {
+ proto = bareudp->ethertype;
+ } else if (bareudp->multi_proto_mode &&
+ ipv4_is_multicast(tunnel_hdr->daddr)) {
+ proto = htons(ETH_P_MPLS_MC);
+ } else {
+ bareudp->dev->stats.rx_dropped++;
+ goto drop;
+ }
+ } else {
+ int addr_type;
+ struct ipv6hdr *tunnel_hdr_v6;
+
+ tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb);
+ addr_type =
+ ipv6_addr_type((struct in6_addr *)&tunnel_hdr_v6->daddr);
+ if (!(addr_type & IPV6_ADDR_MULTICAST)) {
+ proto = bareudp->ethertype;
+ } else if (bareudp->multi_proto_mode &&
+ (addr_type & IPV6_ADDR_MULTICAST)) {
+ proto = htons(ETH_P_MPLS_MC);
+ } else {
+ bareudp->dev->stats.rx_dropped++;
+ goto drop;
+ }
+ }
+ } else {
+ proto = bareudp->ethertype;
+ }
if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN,
proto,
int err;
if (skb->protocol != bareudp->ethertype) {
- err = -EINVAL;
- goto tx_error;
+ if (!bareudp->multi_proto_mode ||
+ (skb->protocol != htons(ETH_P_MPLS_MC) &&
+ skb->protocol != htons(ETH_P_IPV6))) {
+ err = -EINVAL;
+ goto tx_error;
+ }
}
info = skb_tunnel_info(skb);
[IFLA_BAREUDP_PORT] = { .type = NLA_U16 },
[IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 },
[IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 },
+ [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG },
};
/* Info for udev, that this is a virtual tunnel endpoint */
if (t)
return -EBUSY;
+ if (conf->multi_proto_mode &&
+ (conf->ethertype != htons(ETH_P_MPLS_UC) &&
+ conf->ethertype != htons(ETH_P_IP)))
+ return -EINVAL;
+
bareudp->port = conf->port;
bareudp->ethertype = conf->ethertype;
bareudp->sport_min = conf->sport_min;
+ bareudp->multi_proto_mode = conf->multi_proto_mode;
err = register_netdevice(dev);
if (err)
return err;
return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */
nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */
nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */
+ nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */
0;
}
goto nla_put_failure;
if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min))
goto nla_put_failure;
+ if (bareudp->multi_proto_mode &&
+ nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE))
+ goto nla_put_failure;
return 0;