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Message-Id: <20211030123921.29672-2-ap420073@gmail.com>
Date: Sat, 30 Oct 2021 12:39:17 +0000
From: Taehee Yoo <ap420073@...il.com>
To: davem@...emloft.net, kuba@...nel.org, dsahern@...nel.org,
netdev@...r.kernel.org
Cc: dkirjanov@...e.de, ap420073@...il.com
Subject: [PATCH net-next v5 1/5] amt: add control plane of amt interface
It adds definitions and control plane code for AMT.
this is very similar to udp tunneling interfaces such as gtp, vxlan, etc.
In the next patch, data plane code will be added.
Signed-off-by: Taehee Yoo <ap420073@...il.com>
---
v1 -> v2:
- Eliminate sparse warnings.
- Use bool type instead of __be16 for identifying v4/v6 protocol.
v2 -> v3:
- Fix compile warning due to unsed variable.
- Add missing spinlock comment.
- Update help message of amt in Kconfig.
v3 -> v4:
- Split patch.
- Fix compile error
v4 -> v5:
- Remove unnecessary rcu_read_lock().
- Remove unnecessary amt_change_mtu().
- Change netlink error message.
- Add validation for IFLA_AMT_LOCAL_IP and IFLA_AMT_DISCOVERY_IP.
- Add comments in amt.h.
- Add missing dev_put() in error path of amt_newlink().
- Fix typo.
MAINTAINERS | 8 +
drivers/net/Kconfig | 16 ++
drivers/net/Makefile | 1 +
drivers/net/amt.c | 488 +++++++++++++++++++++++++++++++++++++++
include/net/amt.h | 236 +++++++++++++++++++
include/uapi/linux/amt.h | 62 +++++
6 files changed, 811 insertions(+)
create mode 100644 drivers/net/amt.c
create mode 100644 include/net/amt.h
create mode 100644 include/uapi/linux/amt.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 3b85f039fbf9..917f360b3ece 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@...il.com>
+L: netdev@...r.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@...log.com>
L: linux-iio@...r.kernel.org
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index dd335ae1122b..034dbd487c33 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 739838623cf6..50b23e71065f 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 000000000000..4a855c7db06d
--- /dev/null
+++ b/drivers/net/amt.c
@@ -0,0 +1,488 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Copyright (c) 2021 Taehee Yoo <ap420073@...il.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 <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;
+ 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;
+
+ 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 (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@...il.com>");
+MODULE_ALIAS_RTNL_LINK("amt");
diff --git a/include/net/amt.h b/include/net/amt.h
new file mode 100644
index 000000000000..6dcfe5b61346
--- /dev/null
+++ b/include/net/amt.h
@@ -0,0 +1,236 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2021 Taehee Yoo <ap420073@...il.com>
+ */
+#ifndef _NET_AMT_H_
+#define _NET_AMT_H_
+
+#include <linux/siphash.h>
+#include <linux/workqueue.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 000000000000..2dccff417195
--- /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@...il.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_ */
--
2.17.1
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