diff --git a/MAINTAINERS b/MAINTAINERS
index 3b85f039fbf9580f40c4c72bb811debff66876af..917f360b3ece7d7eddadee5587864598876edea9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1020,6 +1020,14 @@ S: Maintained
F: Documentation/devicetree/bindings/iio/light/ams,as73211.yaml
F: drivers/iio/light/as73211.c
+AMT (Automatic Multicast Tunneling)
+M: Taehee Yoo <ap420073@gmail.com>
+L: netdev@vger.kernel.org
+S: Maintained
+T: git git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git
+T: git git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git
+F: drivers/net/amt.c
+
ANALOG DEVICES INC AD7192 DRIVER
M: Alexandru Tachici <alexandru.tachici@analog.com>
L: linux-iio@vger.kernel.org
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index dd335ae1122b0d7660d961db055b22cdbd97028f..034dbd487c3347eef8674f1c1d76ecc3755a119d 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -291,6 +291,22 @@ config GTP
To compile this drivers as a module, choose M here: the module
will be called gtp.
+config AMT
+ tristate "Automatic Multicast Tunneling (AMT)"
+ depends on INET && IP_MULTICAST
+ select NET_UDP_TUNNEL
+ help
+ This allows one to create AMT(Automatic Multicast Tunneling)
+ virtual interfaces that provide multicast tunneling.
+ There are two roles, Gateway, and Relay.
+ Gateway Encapsulates IGMP/MLD traffic from listeners to the Relay.
+ Gateway Decapsulates multicast traffic from the Relay to Listeners.
+ Relay Encapsulates multicast traffic from Sources to Gateway.
+ Relay Decapsulates IGMP/MLD traffic from Gateway.
+
+ To compile this drivers as a module, choose M here: the module
+ will be called amt.
+
config MACSEC
tristate "IEEE 802.1AE MAC-level encryption (MACsec)"
select CRYPTO
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 739838623cf6569738c4125d85a17b3e47dc12f5..50b23e71065f6a8f1d6efc26d30a3fe20b39dc40 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_WIREGUARD) += wireguard/
obj-$(CONFIG_EQUALIZER) += eql.o
obj-$(CONFIG_IFB) += ifb.o
obj-$(CONFIG_MACSEC) += macsec.o
+obj-$(CONFIG_AMT) += amt.o
obj-$(CONFIG_MACVLAN) += macvlan.o
obj-$(CONFIG_MACVTAP) += macvtap.o
obj-$(CONFIG_MII) += mii.o
diff --git a/drivers/net/amt.c b/drivers/net/amt.c
new file mode 100644
index 0000000000000000000000000000000000000000..addab3b1de0a7b04889dc65779f74e14376b035b
--- /dev/null
+++ b/drivers/net/amt.c
@@ -0,0 +1,493 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Copyright (c) 2021 Taehee Yoo <ap420073@gmail.com> */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/udp.h>
+#include <linux/jhash.h>
+#include <linux/if_tunnel.h>
+#include <linux/net.h>
+#include <linux/igmp.h>
+#include <linux/workqueue.h>
+#include <net/net_namespace.h>
+#include <net/protocol.h>
+#include <net/ip.h>
+#include <net/udp.h>
+#include <net/udp_tunnel.h>
+#include <net/icmp.h>
+#include <net/mld.h>
+#include <net/amt.h>
+#include <uapi/linux/amt.h>
+#include <linux/security.h>
+#include <net/gro_cells.h>
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/if_inet6.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/ip6_route.h>
+#include <net/inet_common.h>
+
+static struct workqueue_struct *amt_wq;
+
+static struct socket *amt_create_sock(struct net *net, __be16 port)
+{
+ struct udp_port_cfg udp_conf;
+ struct socket *sock;
+ int err;
+
+ memset(&udp_conf, 0, sizeof(udp_conf));
+ udp_conf.family = AF_INET;
+ udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
+
+ udp_conf.local_udp_port = port;
+
+ err = udp_sock_create(net, &udp_conf, &sock);
+ if (err < 0)
+ return ERR_PTR(err);
+
+ return sock;
+}
+
+static int amt_socket_create(struct amt_dev *amt)
+{
+ struct udp_tunnel_sock_cfg tunnel_cfg;
+ struct socket *sock;
+
+ sock = amt_create_sock(amt->net, amt->relay_port);
+ if (IS_ERR(sock))
+ return PTR_ERR(sock);
+
+ /* Mark socket as an encapsulation socket */
+ memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
+ tunnel_cfg.sk_user_data = amt;
+ tunnel_cfg.encap_type = 1;
+ tunnel_cfg.encap_destroy = NULL;
+ setup_udp_tunnel_sock(amt->net, sock, &tunnel_cfg);
+
+ rcu_assign_pointer(amt->sock, sock);
+ return 0;
+}
+
+static int amt_dev_open(struct net_device *dev)
+{
+ struct amt_dev *amt = netdev_priv(dev);
+ int err;
+
+ amt->ready4 = false;
+ amt->ready6 = false;
+
+ err = amt_socket_create(amt);
+ if (err)
+ return err;
+
+ amt->req_cnt = 0;
+ amt->remote_ip = 0;
+ get_random_bytes(&amt->key, sizeof(siphash_key_t));
+
+ amt->status = AMT_STATUS_INIT;
+ return err;
+}
+
+static int amt_dev_stop(struct net_device *dev)
+{
+ struct amt_dev *amt = netdev_priv(dev);
+ struct socket *sock;
+
+ /* shutdown */
+ sock = rtnl_dereference(amt->sock);
+ RCU_INIT_POINTER(amt->sock, NULL);
+ synchronize_net();
+ if (sock)
+ udp_tunnel_sock_release(sock);
+
+ amt->ready4 = false;
+ amt->ready6 = false;
+ amt->req_cnt = 0;
+ amt->remote_ip = 0;
+
+ return 0;
+}
+
+static const struct device_type amt_type = {
+ .name = "amt",
+};
+
+static int amt_dev_init(struct net_device *dev)
+{
+ struct amt_dev *amt = netdev_priv(dev);
+ int err;
+
+ amt->dev = dev;
+ dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ err = gro_cells_init(&amt->gro_cells, dev);
+ if (err) {
+ free_percpu(dev->tstats);
+ return err;
+ }
+
+ return 0;
+}
+
+static void amt_dev_uninit(struct net_device *dev)
+{
+ struct amt_dev *amt = netdev_priv(dev);
+
+ gro_cells_destroy(&amt->gro_cells);
+ free_percpu(dev->tstats);
+}
+
+static const struct net_device_ops amt_netdev_ops = {
+ .ndo_init = amt_dev_init,
+ .ndo_uninit = amt_dev_uninit,
+ .ndo_open = amt_dev_open,
+ .ndo_stop = amt_dev_stop,
+ .ndo_get_stats64 = dev_get_tstats64,
+};
+
+static void amt_link_setup(struct net_device *dev)
+{
+ dev->netdev_ops = &amt_netdev_ops;
+ dev->needs_free_netdev = true;
+ SET_NETDEV_DEVTYPE(dev, &amt_type);
+ dev->min_mtu = ETH_MIN_MTU;
+ dev->max_mtu = ETH_MAX_MTU;
+ dev->type = ARPHRD_NONE;
+ dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
+ dev->hard_header_len = 0;
+ dev->addr_len = 0;
+ dev->priv_flags |= IFF_NO_QUEUE;
+ dev->features |= NETIF_F_LLTX;
+ dev->features |= NETIF_F_GSO_SOFTWARE;
+ dev->features |= NETIF_F_NETNS_LOCAL;
+ dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
+ dev->hw_features |= NETIF_F_FRAGLIST | NETIF_F_RXCSUM;
+ dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+ eth_hw_addr_random(dev);
+ eth_zero_addr(dev->broadcast);
+ ether_setup(dev);
+}
+
+static const struct nla_policy amt_policy[IFLA_AMT_MAX + 1] = {
+ [IFLA_AMT_MODE] = { .type = NLA_U32 },
+ [IFLA_AMT_RELAY_PORT] = { .type = NLA_U16 },
+ [IFLA_AMT_GATEWAY_PORT] = { .type = NLA_U16 },
+ [IFLA_AMT_LINK] = { .type = NLA_U32 },
+ [IFLA_AMT_LOCAL_IP] = { .len = sizeof_field(struct iphdr, daddr) },
+ [IFLA_AMT_REMOTE_IP] = { .len = sizeof_field(struct iphdr, daddr) },
+ [IFLA_AMT_DISCOVERY_IP] = { .len = sizeof_field(struct iphdr, daddr) },
+ [IFLA_AMT_MAX_TUNNELS] = { .type = NLA_U32 },
+};
+
+static int amt_validate(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ if (!data)
+ return -EINVAL;
+
+ if (!data[IFLA_AMT_LINK]) {
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_LINK],
+ "Link attribute is required");
+ return -EINVAL;
+ }
+
+ if (!data[IFLA_AMT_MODE]) {
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_MODE],
+ "Mode attribute is required");
+ return -EINVAL;
+ }
+
+ if (nla_get_u32(data[IFLA_AMT_MODE]) > AMT_MODE_MAX) {
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_MODE],
+ "Mode attribute is not valid");
+ return -EINVAL;
+ }
+
+ if (!data[IFLA_AMT_LOCAL_IP]) {
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_DISCOVERY_IP],
+ "Local attribute is required");
+ return -EINVAL;
+ }
+
+ if (!data[IFLA_AMT_DISCOVERY_IP] &&
+ nla_get_u32(data[IFLA_AMT_MODE]) == AMT_MODE_GATEWAY) {
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_LOCAL_IP],
+ "Discovery attribute is required");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int amt_newlink(struct net *net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct amt_dev *amt = netdev_priv(dev);
+ int err = -EINVAL;
+
+ amt->net = net;
+ amt->mode = nla_get_u32(data[IFLA_AMT_MODE]);
+
+ if (data[IFLA_AMT_MAX_TUNNELS])
+ amt->max_tunnels = nla_get_u32(data[IFLA_AMT_MAX_TUNNELS]);
+ else
+ amt->max_tunnels = AMT_MAX_TUNNELS;
+
+ spin_lock_init(&amt->lock);
+ amt->max_groups = AMT_MAX_GROUP;
+ amt->max_sources = AMT_MAX_SOURCE;
+ amt->hash_buckets = AMT_HSIZE;
+ amt->nr_tunnels = 0;
+ get_random_bytes(&amt->hash_seed, sizeof(amt->hash_seed));
+ amt->stream_dev = dev_get_by_index(net,
+ nla_get_u32(data[IFLA_AMT_LINK]));
+ if (!amt->stream_dev) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_LINK],
+ "Can't find stream device");
+ return -ENODEV;
+ }
+
+ if (amt->stream_dev->type != ARPHRD_ETHER) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_LINK],
+ "Invalid stream device type");
+ goto err;
+ }
+
+ amt->local_ip = nla_get_in_addr(data[IFLA_AMT_LOCAL_IP]);
+ if (ipv4_is_loopback(amt->local_ip) ||
+ ipv4_is_zeronet(amt->local_ip) ||
+ ipv4_is_multicast(amt->local_ip)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_LOCAL_IP],
+ "Invalid Local address");
+ goto err;
+ }
+
+ if (data[IFLA_AMT_RELAY_PORT])
+ amt->relay_port = nla_get_be16(data[IFLA_AMT_RELAY_PORT]);
+ else
+ amt->relay_port = htons(IANA_AMT_UDP_PORT);
+
+ if (data[IFLA_AMT_GATEWAY_PORT])
+ amt->gw_port = nla_get_be16(data[IFLA_AMT_GATEWAY_PORT]);
+ else
+ amt->gw_port = htons(IANA_AMT_UDP_PORT);
+
+ if (!amt->relay_port) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP],
+ "relay port must not be 0");
+ goto err;
+ }
+ if (amt->mode == AMT_MODE_RELAY) {
+ amt->qrv = amt->net->ipv4.sysctl_igmp_qrv;
+ amt->qri = 10;
+ dev->needed_headroom = amt->stream_dev->needed_headroom +
+ AMT_RELAY_HLEN;
+ dev->mtu = amt->stream_dev->mtu - AMT_RELAY_HLEN;
+ dev->max_mtu = dev->mtu;
+ dev->min_mtu = ETH_MIN_MTU + AMT_RELAY_HLEN;
+ } else {
+ if (!data[IFLA_AMT_DISCOVERY_IP]) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP],
+ "discovery must be set in gateway mode");
+ goto err;
+ }
+ if (!amt->gw_port) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP],
+ "gateway port must not be 0");
+ goto err;
+ }
+ amt->remote_ip = 0;
+ amt->discovery_ip = nla_get_in_addr(data[IFLA_AMT_DISCOVERY_IP]);
+ if (ipv4_is_loopback(amt->discovery_ip) ||
+ ipv4_is_zeronet(amt->discovery_ip) ||
+ ipv4_is_multicast(amt->discovery_ip)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP],
+ "discovery must be unicast");
+ goto err;
+ }
+
+ dev->needed_headroom = amt->stream_dev->needed_headroom +
+ AMT_GW_HLEN;
+ dev->mtu = amt->stream_dev->mtu - AMT_GW_HLEN;
+ dev->max_mtu = dev->mtu;
+ dev->min_mtu = ETH_MIN_MTU + AMT_GW_HLEN;
+ }
+ amt->qi = AMT_INIT_QUERY_INTERVAL;
+
+ err = register_netdevice(dev);
+ if (err < 0) {
+ netdev_dbg(dev, "failed to register new netdev %d\n", err);
+ goto err;
+ }
+
+ err = netdev_upper_dev_link(amt->stream_dev, dev, extack);
+ if (err < 0) {
+ unregister_netdevice(dev);
+ goto err;
+ }
+
+ return 0;
+err:
+ dev_put(amt->stream_dev);
+ return err;
+}
+
+static void amt_dellink(struct net_device *dev, struct list_head *head)
+{
+ struct amt_dev *amt = netdev_priv(dev);
+
+ unregister_netdevice_queue(dev, head);
+ netdev_upper_dev_unlink(amt->stream_dev, dev);
+ dev_put(amt->stream_dev);
+}
+
+static size_t amt_get_size(const struct net_device *dev)
+{
+ return nla_total_size(sizeof(__u32)) + /* IFLA_AMT_MODE */
+ nla_total_size(sizeof(__u16)) + /* IFLA_AMT_RELAY_PORT */
+ nla_total_size(sizeof(__u16)) + /* IFLA_AMT_GATEWAY_PORT */
+ nla_total_size(sizeof(__u32)) + /* IFLA_AMT_LINK */
+ nla_total_size(sizeof(__u32)) + /* IFLA_MAX_TUNNELS */
+ nla_total_size(sizeof(struct iphdr)) + /* IFLA_AMT_DISCOVERY_IP */
+ nla_total_size(sizeof(struct iphdr)) + /* IFLA_AMT_REMOTE_IP */
+ nla_total_size(sizeof(struct iphdr)); /* IFLA_AMT_LOCAL_IP */
+}
+
+static int amt_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+ struct amt_dev *amt = netdev_priv(dev);
+
+ if (nla_put_u32(skb, IFLA_AMT_MODE, amt->mode))
+ goto nla_put_failure;
+ if (nla_put_be16(skb, IFLA_AMT_RELAY_PORT, amt->relay_port))
+ goto nla_put_failure;
+ if (nla_put_be16(skb, IFLA_AMT_GATEWAY_PORT, amt->gw_port))
+ goto nla_put_failure;
+ if (nla_put_u32(skb, IFLA_AMT_LINK, amt->stream_dev->ifindex))
+ goto nla_put_failure;
+ if (nla_put_in_addr(skb, IFLA_AMT_LOCAL_IP, amt->local_ip))
+ goto nla_put_failure;
+ if (nla_put_in_addr(skb, IFLA_AMT_DISCOVERY_IP, amt->discovery_ip))
+ goto nla_put_failure;
+ if (amt->remote_ip)
+ if (nla_put_in_addr(skb, IFLA_AMT_REMOTE_IP, amt->remote_ip))
+ goto nla_put_failure;
+ if (nla_put_u32(skb, IFLA_AMT_MAX_TUNNELS, amt->max_tunnels))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static struct rtnl_link_ops amt_link_ops __read_mostly = {
+ .kind = "amt",
+ .maxtype = IFLA_AMT_MAX,
+ .policy = amt_policy,
+ .priv_size = sizeof(struct amt_dev),
+ .setup = amt_link_setup,
+ .validate = amt_validate,
+ .newlink = amt_newlink,
+ .dellink = amt_dellink,
+ .get_size = amt_get_size,
+ .fill_info = amt_fill_info,
+};
+
+static struct net_device *amt_lookup_upper_dev(struct net_device *dev)
+{
+ struct net_device *upper_dev;
+ struct amt_dev *amt;
+
+ for_each_netdev(dev_net(dev), upper_dev) {
+ if (netif_is_amt(upper_dev)) {
+ amt = netdev_priv(upper_dev);
+ if (amt->stream_dev == dev)
+ return upper_dev;
+ }
+ }
+
+ return NULL;
+}
+
+static int amt_device_event(struct notifier_block *unused,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct net_device *upper_dev;
+ struct amt_dev *amt;
+ LIST_HEAD(list);
+ int new_mtu;
+
+ upper_dev = amt_lookup_upper_dev(dev);
+ if (!upper_dev)
+ return NOTIFY_DONE;
+ amt = netdev_priv(upper_dev);
+
+ switch (event) {
+ case NETDEV_UNREGISTER:
+ amt_dellink(amt->dev, &list);
+ unregister_netdevice_many(&list);
+ break;
+ case NETDEV_CHANGEMTU:
+ if (amt->mode == AMT_MODE_RELAY)
+ new_mtu = dev->mtu - AMT_RELAY_HLEN;
+ else
+ new_mtu = dev->mtu - AMT_GW_HLEN;
+
+ dev_set_mtu(amt->dev, new_mtu);
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block amt_notifier_block __read_mostly = {
+ .notifier_call = amt_device_event,
+};
+
+static int __init amt_init(void)
+{
+ int err;
+
+ err = register_netdevice_notifier(&amt_notifier_block);
+ if (err < 0)
+ goto err;
+
+ err = rtnl_link_register(&amt_link_ops);
+ if (err < 0)
+ goto unregister_notifier;
+
+ amt_wq = alloc_workqueue("amt", WQ_UNBOUND, 1);
+ if (!amt_wq)
+ goto rtnl_unregister;
+
+ return 0;
+
+rtnl_unregister:
+ rtnl_link_unregister(&amt_link_ops);
+unregister_notifier:
+ unregister_netdevice_notifier(&amt_notifier_block);
+err:
+ pr_err("error loading AMT module loaded\n");
+ return err;
+}
+late_initcall(amt_init);
+
+static void __exit amt_fini(void)
+{
+ rtnl_link_unregister(&amt_link_ops);
+ unregister_netdevice_notifier(&amt_notifier_block);
+ destroy_workqueue(amt_wq);
+}
+module_exit(amt_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Taehee Yoo <ap420073@gmail.com>");
+MODULE_ALIAS_RTNL_LINK("amt");
diff --git a/include/net/amt.h b/include/net/amt.h
new file mode 100644
index 0000000000000000000000000000000000000000..ce24ff823555c2e6ec78cec7a6b5659144f850f4
--- /dev/null
+++ b/include/net/amt.h
@@ -0,0 +1,235 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2021 Taehee Yoo <ap420073@gmail.com>
+ */
+#ifndef _NET_AMT_H_
+#define _NET_AMT_H_
+
+#include <linux/siphash.h>
+#include <linux/jhash.h>
+
+enum amt_msg_type {
+ AMT_MSG_DISCOVERY = 1,
+ AMT_MSG_ADVERTISEMENT,
+ AMT_MSG_REQUEST,
+ AMT_MSG_MEMBERSHIP_QUERY,
+ AMT_MSG_MEMBERSHIP_UPDATE,
+ AMT_MSG_MULTICAST_DATA,
+ AMT_MSG_TEARDOWM,
+ __AMT_MSG_MAX,
+};
+
+#define AMT_MSG_MAX (__AMT_MSG_MAX - 1)
+
+enum amt_status {
+ AMT_STATUS_INIT,
+ AMT_STATUS_SENT_DISCOVERY,
+ AMT_STATUS_RECEIVED_DISCOVERY,
+ AMT_STATUS_SENT_ADVERTISEMENT,
+ AMT_STATUS_RECEIVED_ADVERTISEMENT,
+ AMT_STATUS_SENT_REQUEST,
+ AMT_STATUS_RECEIVED_REQUEST,
+ AMT_STATUS_SENT_QUERY,
+ AMT_STATUS_RECEIVED_QUERY,
+ AMT_STATUS_SENT_UPDATE,
+ AMT_STATUS_RECEIVED_UPDATE,
+ __AMT_STATUS_MAX,
+};
+
+#define AMT_STATUS_MAX (__AMT_STATUS_MAX - 1)
+
+struct amt_header_discovery {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ u32 type:4,
+ version:4,
+ reserved:24;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ u32 version:4,
+ type:4,
+ reserved:24;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+ __be32 nonce;
+} __packed;
+
+struct amt_header_advertisement {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ u32 type:4,
+ version:4,
+ reserved:24;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ u32 version:4,
+ type:4,
+ reserved:24;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+ __be32 nonce;
+ __be32 ip4;
+} __packed;
+
+struct amt_header_request {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ u32 type:4,
+ version:4,
+ reserved1:7,
+ p:1,
+ reserved2:16;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ u32 version:4,
+ type:4,
+ p:1,
+ reserved1:7,
+ reserved2:16;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+ __be32 nonce;
+} __packed;
+
+struct amt_header_membership_query {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ u64 type:4,
+ version:4,
+ reserved:6,
+ l:1,
+ g:1,
+ response_mac:48;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ u64 version:4,
+ type:4,
+ g:1,
+ l:1,
+ reserved:6,
+ response_mac:48;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+ __be32 nonce;
+} __packed;
+
+struct amt_header_membership_update {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ u64 type:4,
+ version:4,
+ reserved:8,
+ response_mac:48;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ u64 version:4,
+ type:4,
+ reserved:8,
+ response_mac:48;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+ __be32 nonce;
+} __packed;
+
+struct amt_header_mcast_data {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ u16 type:4,
+ version:4,
+ reserved:8;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ u16 version:4,
+ type:4,
+ reserved:8;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+} __packed;
+
+struct amt_gw_headers {
+ union {
+ struct amt_header_discovery discovery;
+ struct amt_header_request request;
+ struct amt_header_membership_update update;
+ };
+} __packed;
+
+struct amt_relay_headers {
+ union {
+ struct amt_header_advertisement advertisement;
+ struct amt_header_membership_query query;
+ struct amt_header_mcast_data data;
+ };
+} __packed;
+
+struct amt_dev {
+ struct net_device *dev;
+ struct net_device *stream_dev;
+ struct net *net;
+ /* Global lock for amt device */
+ spinlock_t lock;
+ /* Used only in relay mode */
+ struct list_head tunnel_list;
+ struct gro_cells gro_cells;
+
+ /* Protected by RTNL */
+ struct delayed_work discovery_wq;
+ /* Protected by RTNL */
+ struct delayed_work req_wq;
+ /* Protected by RTNL */
+ struct delayed_work secret_wq;
+ /* AMT status */
+ enum amt_status status;
+ /* Generated key */
+ siphash_key_t key;
+ struct socket __rcu *sock;
+ u32 max_groups;
+ u32 max_sources;
+ u32 hash_buckets;
+ u32 hash_seed;
+ /* Default 128 */
+ u32 max_tunnels;
+ /* Default 128 */
+ u32 nr_tunnels;
+ /* Gateway or Relay mode */
+ u32 mode;
+ /* Default 2268 */
+ __be16 relay_port;
+ /* Default 2268 */
+ __be16 gw_port;
+ /* Outer local ip */
+ __be32 local_ip;
+ /* Outer remote ip */
+ __be32 remote_ip;
+ /* Outer discovery ip */
+ __be32 discovery_ip;
+ /* Only used in gateway mode */
+ __be32 nonce;
+ /* Gateway sent request and received query */
+ bool ready4;
+ bool ready6;
+ u8 req_cnt;
+ u8 qi;
+ u64 qrv;
+ u64 qri;
+ /* Used only in gateway mode */
+ u64 mac:48,
+ reserved:16;
+};
+
+#define AMT_MAX_GROUP 32
+#define AMT_MAX_SOURCE 128
+#define AMT_HSIZE_SHIFT 8
+#define AMT_HSIZE (1 << AMT_HSIZE_SHIFT)
+
+#define AMT_INIT_QUERY_INTERVAL 125
+#define IANA_AMT_UDP_PORT 2268
+#define AMT_MAX_TUNNELS 128
+#define AMT_MAX_REQS 128
+#define AMT_GW_HLEN (sizeof(struct iphdr) + \
+ sizeof(struct udphdr) + \
+ sizeof(struct amt_gw_headers))
+#define AMT_RELAY_HLEN (sizeof(struct iphdr) + \
+ sizeof(struct udphdr) + \
+ sizeof(struct amt_relay_headers))
+
+static inline bool netif_is_amt(const struct net_device *dev)
+{
+ return dev->rtnl_link_ops && !strcmp(dev->rtnl_link_ops->kind, "amt");
+}
+
+#endif /* _NET_AMT_H_ */
diff --git a/include/uapi/linux/amt.h b/include/uapi/linux/amt.h
new file mode 100644
index 0000000000000000000000000000000000000000..2dccff4171956839bb394028be0db73906a2e0e1
--- /dev/null
+++ b/include/uapi/linux/amt.h
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
+/*
+ * Copyright (c) 2021 Taehee Yoo <ap420073@gmail.com>
+ */
+#ifndef _UAPI_AMT_H_
+#define _UAPI_AMT_H_
+
+enum ifla_amt_mode {
+ /* AMT interface works as Gateway mode.
+ * The Gateway mode encapsulates IGMP/MLD traffic and decapsulates
+ * multicast traffic.
+ */
+ AMT_MODE_GATEWAY = 0,
+ /* AMT interface works as Relay mode.
+ * The Relay mode encapsulates multicast traffic and decapsulates
+ * IGMP/MLD traffic.
+ */
+ AMT_MODE_RELAY,
+ __AMT_MODE_MAX,
+};
+
+#define AMT_MODE_MAX (__AMT_MODE_MAX - 1)
+
+enum {
+ IFLA_AMT_UNSPEC,
+ /* This attribute specify mode etier Gateway or Relay. */
+ IFLA_AMT_MODE,
+ /* This attribute specify Relay port.
+ * AMT interface is created as Gateway mode, this attribute is used
+ * to specify relay(remote) port.
+ * AMT interface is created as Relay mode, this attribute is used
+ * as local port.
+ */
+ IFLA_AMT_RELAY_PORT,
+ /* This attribute specify Gateway port.
+ * AMT interface is created as Gateway mode, this attribute is used
+ * as local port.
+ * AMT interface is created as Relay mode, this attribute is not used.
+ */
+ IFLA_AMT_GATEWAY_PORT,
+ /* This attribute specify physical device */
+ IFLA_AMT_LINK,
+ /* This attribute specify local ip address */
+ IFLA_AMT_LOCAL_IP,
+ /* This attribute specify Relay ip address.
+ * So, this is not used by Relay.
+ */
+ IFLA_AMT_REMOTE_IP,
+ /* This attribute specify Discovery ip address.
+ * When Gateway get started, it send discovery message to find the
+ * Relay's ip address.
+ * So, this is not used by Relay.
+ */
+ IFLA_AMT_DISCOVERY_IP,
+ /* This attribute specify number of maximum tunnel. */
+ IFLA_AMT_MAX_TUNNELS,
+ __IFLA_AMT_MAX,
+};
+
+#define IFLA_AMT_MAX (__IFLA_AMT_MAX - 1)
+
+#endif /* _UAPI_AMT_H_ */