[linux-2.6-block.git] / drivers / net / geneve.c

/*
 * GENEVE: Generic Network Virtualization Encapsulation
 *
 * Copyright (c) 2015 Red Hat, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/hash.h>
#include <net/rtnetlink.h>
#include <net/geneve.h>

#define GENEVE_NETDEV_VER	"0.6"

#define GENEVE_UDP_PORT		6081

#define GENEVE_N_VID		(1u << 24)
#define GENEVE_VID_MASK		(GENEVE_N_VID - 1)

#define VNI_HASH_BITS		10
#define VNI_HASH_SIZE		(1<<VNI_HASH_BITS)

static bool log_ecn_error = true;
module_param(log_ecn_error, bool, 0644);
MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");

/* per-network namespace private data for this module */
struct geneve_net {
	struct list_head  geneve_list;
	struct hlist_head vni_list[VNI_HASH_SIZE];
};

/* Pseudo network device */
struct geneve_dev {
	struct hlist_node  hlist;	/* vni hash table */
	struct net	   *net;	/* netns for packet i/o */
	struct net_device  *dev;	/* netdev for geneve tunnel */
	struct geneve_sock *sock;	/* socket used for geneve tunnel */
	u8                 vni[3];	/* virtual network ID for tunnel */
	u8                 ttl;		/* TTL override */
	u8                 tos;		/* TOS override */
	struct sockaddr_in remote;	/* IPv4 address for link partner */
	struct list_head   next;	/* geneve's per namespace list */
};

static int geneve_net_id;

static inline __u32 geneve_net_vni_hash(u8 vni[3])
{
	__u32 vnid;

	vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
	return hash_32(vnid, VNI_HASH_BITS);
}

/* geneve receive/decap routine */
static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb)
{
	struct genevehdr *gnvh = geneve_hdr(skb);
	struct geneve_dev *dummy, *geneve = NULL;
	struct geneve_net *gn;
	struct iphdr *iph = NULL;
	struct pcpu_sw_netstats *stats;
	struct hlist_head *vni_list_head;
	int err = 0;
	__u32 hash;

	iph = ip_hdr(skb); /* Still outer IP header... */

	gn = gs->rcv_data;

	/* Find the device for this VNI */
	hash = geneve_net_vni_hash(gnvh->vni);
	vni_list_head = &gn->vni_list[hash];
	hlist_for_each_entry_rcu(dummy, vni_list_head, hlist) {
		if (!memcmp(gnvh->vni, dummy->vni, sizeof(dummy->vni)) &&
		    iph->saddr == dummy->remote.sin_addr.s_addr) {
			geneve = dummy;
			break;
		}
	}
	if (!geneve)
		goto drop;

	/* Drop packets w/ critical options,
	 * since we don't support any...
	 */
	if (gnvh->critical)
		goto drop;

	skb_reset_mac_header(skb);
	skb_scrub_packet(skb, !net_eq(geneve->net, dev_net(geneve->dev)));
	skb->protocol = eth_type_trans(skb, geneve->dev);
	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);

	/* Ignore packet loops (and multicast echo) */
	if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
		goto drop;

	skb_reset_network_header(skb);

	iph = ip_hdr(skb); /* Now inner IP header... */
	err = IP_ECN_decapsulate(iph, skb);

	if (unlikely(err)) {
		if (log_ecn_error)
			net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
					     &iph->saddr, iph->tos);
		if (err > 1) {
			++geneve->dev->stats.rx_frame_errors;
			++geneve->dev->stats.rx_errors;
			goto drop;
		}
	}

	stats = this_cpu_ptr(geneve->dev->tstats);
	u64_stats_update_begin(&stats->syncp);
	stats->rx_packets++;
	stats->rx_bytes += skb->len;
	u64_stats_update_end(&stats->syncp);

	netif_rx(skb);

	return;
drop:
	/* Consume bad packet */
	kfree_skb(skb);
}

/* Setup stats when device is created */
static int geneve_init(struct net_device *dev)
{
	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
	if (!dev->tstats)
		return -ENOMEM;

	return 0;
}

static void geneve_uninit(struct net_device *dev)
{
	free_percpu(dev->tstats);
}

static int geneve_open(struct net_device *dev)
{
	struct geneve_dev *geneve = netdev_priv(dev);
	struct net *net = geneve->net;
	struct geneve_net *gn = net_generic(geneve->net, geneve_net_id);
	struct geneve_sock *gs;

	gs = geneve_sock_add(net, htons(GENEVE_UDP_PORT), geneve_rx, gn,
	                     false, false);
	if (IS_ERR(gs))
		return PTR_ERR(gs);

	geneve->sock = gs;

	return 0;
}

static int geneve_stop(struct net_device *dev)
{
	struct geneve_dev *geneve = netdev_priv(dev);
	struct geneve_sock *gs = geneve->sock;

	geneve_sock_release(gs);

	return 0;
}

static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct geneve_dev *geneve = netdev_priv(dev);
	struct geneve_sock *gs = geneve->sock;
	struct rtable *rt = NULL;
	const struct iphdr *iip; /* interior IP header */
	struct flowi4 fl4;
	int err;
	__be16 sport;
	__u8 tos, ttl;

	iip = ip_hdr(skb);

	skb_reset_mac_header(skb);

	/* TODO: port min/max limits should be configurable */
	sport = udp_flow_src_port(dev_net(dev), skb, 0, 0, true);

	tos = geneve->tos;
	if (tos == 1)
		tos = ip_tunnel_get_dsfield(iip, skb);

	memset(&fl4, 0, sizeof(fl4));
	fl4.flowi4_tos = RT_TOS(tos);
	fl4.daddr = geneve->remote.sin_addr.s_addr;
	rt = ip_route_output_key(geneve->net, &fl4);
	if (IS_ERR(rt)) {
		netdev_dbg(dev, "no route to %pI4\n", &fl4.daddr);
		dev->stats.tx_carrier_errors++;
		goto tx_error;
	}
	if (rt->dst.dev == dev) { /* is this necessary? */
		netdev_dbg(dev, "circular route to %pI4\n", &fl4.daddr);
		dev->stats.collisions++;
		goto rt_tx_error;
	}

	tos = ip_tunnel_ecn_encap(tos, iip, skb);

	ttl = geneve->ttl;
	if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
		ttl = 1;

	ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);

	/* no need to handle local destination and encap bypass...yet... */

	err = geneve_xmit_skb(gs, rt, skb, fl4.saddr, fl4.daddr,
	                      tos, ttl, 0, sport, htons(GENEVE_UDP_PORT), 0,
	                      geneve->vni, 0, NULL, false,
	                      !net_eq(geneve->net, dev_net(geneve->dev)));
	if (err < 0)
		ip_rt_put(rt);

	iptunnel_xmit_stats(err, &dev->stats, dev->tstats);

	return NETDEV_TX_OK;

rt_tx_error:
	ip_rt_put(rt);
tx_error:
	dev->stats.tx_errors++;
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
}

static const struct net_device_ops geneve_netdev_ops = {
	.ndo_init		= geneve_init,
	.ndo_uninit		= geneve_uninit,
	.ndo_open		= geneve_open,
	.ndo_stop		= geneve_stop,
	.ndo_start_xmit		= geneve_xmit,
	.ndo_get_stats64	= ip_tunnel_get_stats64,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_mac_address	= eth_mac_addr,
};

static void geneve_get_drvinfo(struct net_device *dev,
			       struct ethtool_drvinfo *drvinfo)
{
	strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
	strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
}

static const struct ethtool_ops geneve_ethtool_ops = {
	.get_drvinfo	= geneve_get_drvinfo,
	.get_link	= ethtool_op_get_link,
};

/* Info for udev, that this is a virtual tunnel endpoint */
static struct device_type geneve_type = {
	.name = "geneve",
};

/* Initialize the device structure. */
static void geneve_setup(struct net_device *dev)
{
	ether_setup(dev);

	dev->netdev_ops = &geneve_netdev_ops;
	dev->ethtool_ops = &geneve_ethtool_ops;
	dev->destructor = free_netdev;

	SET_NETDEV_DEVTYPE(dev, &geneve_type);

	dev->tx_queue_len = 0;
	dev->features    |= NETIF_F_LLTX;
	dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
	dev->features    |= NETIF_F_RXCSUM;
	dev->features    |= NETIF_F_GSO_SOFTWARE;

	dev->vlan_features = dev->features;
	dev->features    |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;

	dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
	dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;

	netif_keep_dst(dev);
	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
}

static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
	[IFLA_GENEVE_ID]		= { .type = NLA_U32 },
	[IFLA_GENEVE_REMOTE]		= { .len = FIELD_SIZEOF(struct iphdr, daddr) },
	[IFLA_GENEVE_TTL]		= { .type = NLA_U8 },
	[IFLA_GENEVE_TOS]		= { .type = NLA_U8 },
};

static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
{
	if (tb[IFLA_ADDRESS]) {
		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
			return -EINVAL;

		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
			return -EADDRNOTAVAIL;
	}

	if (!data)
		return -EINVAL;

	if (data[IFLA_GENEVE_ID]) {
		__u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);

		if (vni >= GENEVE_VID_MASK)
			return -ERANGE;
	}

	return 0;
}

static int geneve_newlink(struct net *net, struct net_device *dev,
			 struct nlattr *tb[], struct nlattr *data[])
{
	struct geneve_net *gn = net_generic(net, geneve_net_id);
	struct geneve_dev *dummy, *geneve = netdev_priv(dev);
	struct hlist_head *vni_list_head;
	struct sockaddr_in remote;	/* IPv4 address for link partner */
	__u32 vni, hash;
	int err;

	if (!data[IFLA_GENEVE_ID] || !data[IFLA_GENEVE_REMOTE])
		return -EINVAL;

	geneve->net = net;
	geneve->dev = dev;

	vni = nla_get_u32(data[IFLA_GENEVE_ID]);
	geneve->vni[0] = (vni & 0x00ff0000) >> 16;
	geneve->vni[1] = (vni & 0x0000ff00) >> 8;
	geneve->vni[2] =  vni & 0x000000ff;

	geneve->remote.sin_addr.s_addr =
		nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
	if (IN_MULTICAST(ntohl(geneve->remote.sin_addr.s_addr)))
		return -EINVAL;

	remote = geneve->remote;
	hash = geneve_net_vni_hash(geneve->vni);
	vni_list_head = &gn->vni_list[hash];
	hlist_for_each_entry_rcu(dummy, vni_list_head, hlist) {
		if (!memcmp(geneve->vni, dummy->vni, sizeof(dummy->vni)) &&
		    !memcmp(&remote, &dummy->remote, sizeof(dummy->remote)))
			return -EBUSY;
	}

	if (tb[IFLA_ADDRESS] == NULL)
		eth_hw_addr_random(dev);

	err = register_netdevice(dev);
	if (err)
		return err;

	if (data[IFLA_GENEVE_TTL])
		geneve->ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);

	if (data[IFLA_GENEVE_TOS])
		geneve->tos = nla_get_u8(data[IFLA_GENEVE_TOS]);

	list_add(&geneve->next, &gn->geneve_list);

	hlist_add_head_rcu(&geneve->hlist, &gn->vni_list[hash]);

	return 0;
}

static void geneve_dellink(struct net_device *dev, struct list_head *head)
{
	struct geneve_dev *geneve = netdev_priv(dev);

	if (!hlist_unhashed(&geneve->hlist))
		hlist_del_rcu(&geneve->hlist);

	list_del(&geneve->next);
	unregister_netdevice_queue(dev, head);
}

static size_t geneve_get_size(const struct net_device *dev)
{
	return nla_total_size(sizeof(__u32)) +	/* IFLA_GENEVE_ID */
		nla_total_size(sizeof(struct in_addr)) + /* IFLA_GENEVE_REMOTE */
		nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
		nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
		0;
}

static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
	struct geneve_dev *geneve = netdev_priv(dev);
	__u32 vni;

	vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
	if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
		goto nla_put_failure;

	if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
			    geneve->remote.sin_addr.s_addr))
		goto nla_put_failure;

	if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
	    nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos))
		goto nla_put_failure;

	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static struct rtnl_link_ops geneve_link_ops __read_mostly = {
	.kind		= "geneve",
	.maxtype	= IFLA_GENEVE_MAX,
	.policy		= geneve_policy,
	.priv_size	= sizeof(struct geneve_dev),
	.setup		= geneve_setup,
	.validate	= geneve_validate,
	.newlink	= geneve_newlink,
	.dellink	= geneve_dellink,
	.get_size	= geneve_get_size,
	.fill_info	= geneve_fill_info,
};

static __net_init int geneve_init_net(struct net *net)
{
	struct geneve_net *gn = net_generic(net, geneve_net_id);
	unsigned int h;

	INIT_LIST_HEAD(&gn->geneve_list);

	for (h = 0; h < VNI_HASH_SIZE; ++h)
		INIT_HLIST_HEAD(&gn->vni_list[h]);

	return 0;
}

static void __net_exit geneve_exit_net(struct net *net)
{
	struct geneve_net *gn = net_generic(net, geneve_net_id);
	struct geneve_dev *geneve, *next;
	struct net_device *dev, *aux;
	LIST_HEAD(list);

	rtnl_lock();

	/* gather any geneve devices that were moved into this ns */
	for_each_netdev_safe(net, dev, aux)
		if (dev->rtnl_link_ops == &geneve_link_ops)
			unregister_netdevice_queue(dev, &list);

	/* now gather any other geneve devices that were created in this ns */
	list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
		/* If geneve->dev is in the same netns, it was already added
		 * to the list by the previous loop.
		 */
		if (!net_eq(dev_net(geneve->dev), net))
			unregister_netdevice_queue(geneve->dev, &list);
	}

	/* unregister the devices gathered above */
	unregister_netdevice_many(&list);
	rtnl_unlock();
}

static struct pernet_operations geneve_net_ops = {
	.init = geneve_init_net,
	.exit = geneve_exit_net,
	.id   = &geneve_net_id,
	.size = sizeof(struct geneve_net),
};

static int __init geneve_init_module(void)
{
	int rc;

	rc = register_pernet_subsys(&geneve_net_ops);
	if (rc)
		goto out1;

	rc = rtnl_link_register(&geneve_link_ops);
	if (rc)
		goto out2;

	return 0;
out2:
	unregister_pernet_subsys(&geneve_net_ops);
out1:
	return rc;
}
late_initcall(geneve_init_module);

static void __exit geneve_cleanup_module(void)
{
	rtnl_link_unregister(&geneve_link_ops);
	unregister_pernet_subsys(&geneve_net_ops);
}
module_exit(geneve_cleanup_module);

MODULE_LICENSE("GPL");
MODULE_VERSION(GENEVE_NETDEV_VER);
MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
MODULE_ALIAS_RTNL_LINK("geneve");
Commit	Line	Data
2d07dc79 JL	1	/*
	2	* GENEVE: Generic Network Virtualization Encapsulation
	3	*
	4	* Copyright (c) 2015 Red Hat, Inc.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	12
	13	#include <linux/kernel.h>
	14	#include <linux/module.h>
	15	#include <linux/netdevice.h>
	16	#include <linux/etherdevice.h>
	17	#include <linux/hash.h>
	18	#include <net/rtnetlink.h>
	19	#include <net/geneve.h>
	20
	21	#define GENEVE_NETDEV_VER "0.6"
	22
	23	#define GENEVE_UDP_PORT 6081
	24
	25	#define GENEVE_N_VID (1u << 24)
	26	#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
	27
	28	#define VNI_HASH_BITS 10
	29	#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
	30
	31	static bool log_ecn_error = true;
	32	module_param(log_ecn_error, bool, 0644);
	33	MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
	34
	35	/* per-network namespace private data for this module */
	36	struct geneve_net {
	37	struct list_head geneve_list;
	38	struct hlist_head vni_list[VNI_HASH_SIZE];
	39	};
	40
	41	/* Pseudo network device */
	42	struct geneve_dev {
	43	struct hlist_node hlist; /* vni hash table */
	44	struct net net; / netns for packet i/o */
	45	struct net_device dev; / netdev for geneve tunnel */
	46	struct geneve_sock sock; / socket used for geneve tunnel */
8760ce58 JL	47	u8 vni[3]; /* virtual network ID for tunnel */
8760ce58 JL	48	u8 ttl; /* TTL override */
d8951125	49	u8 tos; /* TOS override */
2d07dc79 JL	50	struct sockaddr_in remote; /* IPv4 address for link partner */
	51	struct list_head next; /* geneve's per namespace list */
	52	};
	53
	54	static int geneve_net_id;
	55
	56	static inline __u32 geneve_net_vni_hash(u8 vni[3])
	57	{
	58	__u32 vnid;
	59
	60	vnid = (vni[0] << 16) \| (vni[1] << 8) \| vni[2];
	61	return hash_32(vnid, VNI_HASH_BITS);
	62	}
	63
	64	/* geneve receive/decap routine */
	65	static void geneve_rx(struct geneve_sock gs, struct sk_buff skb)
	66	{
	67	struct genevehdr *gnvh = geneve_hdr(skb);
	68	struct geneve_dev dummy, geneve = NULL;
	69	struct geneve_net *gn;
	70	struct iphdr *iph = NULL;
	71	struct pcpu_sw_netstats *stats;
	72	struct hlist_head *vni_list_head;
	73	int err = 0;
	74	__u32 hash;
	75
	76	iph = ip_hdr(skb); /* Still outer IP header... */
	77
	78	gn = gs->rcv_data;
	79
	80	/* Find the device for this VNI */
	81	hash = geneve_net_vni_hash(gnvh->vni);
	82	vni_list_head = &gn->vni_list[hash];
	83	hlist_for_each_entry_rcu(dummy, vni_list_head, hlist) {
	84	if (!memcmp(gnvh->vni, dummy->vni, sizeof(dummy->vni)) &&
	85	iph->saddr == dummy->remote.sin_addr.s_addr) {
	86	geneve = dummy;
	87	break;
	88	}
	89	}
	90	if (!geneve)
	91	goto drop;
	92
	93	/* Drop packets w/ critical options,
	94	* since we don't support any...
	95	*/
	96	if (gnvh->critical)
	97	goto drop;
	98
	99	skb_reset_mac_header(skb);
	100	skb_scrub_packet(skb, !net_eq(geneve->net, dev_net(geneve->dev)));
	101	skb->protocol = eth_type_trans(skb, geneve->dev);
	102	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
	103
	104	/* Ignore packet loops (and multicast echo) */
	105	if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
	106	goto drop;
	107
	108	skb_reset_network_header(skb);
	109
	110	iph = ip_hdr(skb); /* Now inner IP header... */
	111	err = IP_ECN_decapsulate(iph, skb);
	112
	113	if (unlikely(err)) {
114	if (log_ecn_error)
115	net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
116	&iph->saddr, iph->tos);
117	if (err > 1) {
118	++geneve->dev->stats.rx_frame_errors;
119	++geneve->dev->stats.rx_errors;
120	goto drop;
121	}
122	}
123
124	stats = this_cpu_ptr(geneve->dev->tstats);
125	u64_stats_update_begin(&stats->syncp);
126	stats->rx_packets++;
127	stats->rx_bytes += skb->len;
128	u64_stats_update_end(&stats->syncp);
129
130	netif_rx(skb);
131
132	return;
133	drop:
134	/* Consume bad packet */
135	kfree_skb(skb);
136	}
137
138	/* Setup stats when device is created */
139	static int geneve_init(struct net_device *dev)
140	{
141	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
142	if (!dev->tstats)
143	return -ENOMEM;
144
145	return 0;
146	}
147
148	static void geneve_uninit(struct net_device *dev)
149	{
150	free_percpu(dev->tstats);
151	}
152
153	static int geneve_open(struct net_device *dev)
154	{
155	struct geneve_dev *geneve = netdev_priv(dev);
156	struct net *net = geneve->net;
157	struct geneve_net *gn = net_generic(geneve->net, geneve_net_id);
158	struct geneve_sock *gs;
159
160	gs = geneve_sock_add(net, htons(GENEVE_UDP_PORT), geneve_rx, gn,
161	false, false);
162	if (IS_ERR(gs))
163	return PTR_ERR(gs);
164
165	geneve->sock = gs;
166
167	return 0;
168	}
169
170	static int geneve_stop(struct net_device *dev)
171	{
172	struct geneve_dev *geneve = netdev_priv(dev);
173	struct geneve_sock *gs = geneve->sock;
174
175	geneve_sock_release(gs);
176
177	return 0;
178	}
179
180	static netdev_tx_t geneve_xmit(struct sk_buff skb, struct net_device dev)
181	{
182	struct geneve_dev *geneve = netdev_priv(dev);
183	struct geneve_sock *gs = geneve->sock;
184	struct rtable *rt = NULL;
185	const struct iphdr iip; / interior IP header */
186	struct flowi4 fl4;
187	int err;
188	__be16 sport;
8760ce58	189	__u8 tos, ttl;
2d07dc79 JL	190
	191	iip = ip_hdr(skb);
	192
	193	skb_reset_mac_header(skb);
	194
	195	/* TODO: port min/max limits should be configurable */
	196	sport = udp_flow_src_port(dev_net(dev), skb, 0, 0, true);
	197
d8951125 JL	198	tos = geneve->tos;
	199	if (tos == 1)
	200	tos = ip_tunnel_get_dsfield(iip, skb);
	201
2d07dc79	202	memset(&fl4, 0, sizeof(fl4));
d8951125	203	fl4.flowi4_tos = RT_TOS(tos);
2d07dc79 JL	204	fl4.daddr = geneve->remote.sin_addr.s_addr;
	205	rt = ip_route_output_key(geneve->net, &fl4);
	206	if (IS_ERR(rt)) {
	207	netdev_dbg(dev, "no route to %pI4\n", &fl4.daddr);
	208	dev->stats.tx_carrier_errors++;
	209	goto tx_error;
	210	}
	211	if (rt->dst.dev == dev) { /* is this necessary? */
	212	netdev_dbg(dev, "circular route to %pI4\n", &fl4.daddr);
	213	dev->stats.collisions++;
	214	goto rt_tx_error;
	215	}
	216
d8951125	217	tos = ip_tunnel_ecn_encap(tos, iip, skb);
2d07dc79	218
8760ce58 JL	219	ttl = geneve->ttl;
8760ce58 JL	220	if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
2d07dc79 JL	221	ttl = 1;
	222
	223	ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
	224
	225	/* no need to handle local destination and encap bypass...yet... */
	226
	227	err = geneve_xmit_skb(gs, rt, skb, fl4.saddr, fl4.daddr,
	228	tos, ttl, 0, sport, htons(GENEVE_UDP_PORT), 0,
	229	geneve->vni, 0, NULL, false,
	230	!net_eq(geneve->net, dev_net(geneve->dev)));
	231	if (err < 0)
	232	ip_rt_put(rt);
	233
	234	iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
	235
	236	return NETDEV_TX_OK;
	237
	238	rt_tx_error:
	239	ip_rt_put(rt);
	240	tx_error:
	241	dev->stats.tx_errors++;
	242	dev_kfree_skb(skb);
	243	return NETDEV_TX_OK;
	244	}
	245
	246	static const struct net_device_ops geneve_netdev_ops = {
	247	.ndo_init = geneve_init,
	248	.ndo_uninit = geneve_uninit,
	249	.ndo_open = geneve_open,
	250	.ndo_stop = geneve_stop,
	251	.ndo_start_xmit = geneve_xmit,
	252	.ndo_get_stats64 = ip_tunnel_get_stats64,
	253	.ndo_change_mtu = eth_change_mtu,
	254	.ndo_validate_addr = eth_validate_addr,
	255	.ndo_set_mac_address = eth_mac_addr,
	256	};
	257
	258	static void geneve_get_drvinfo(struct net_device *dev,
	259	struct ethtool_drvinfo *drvinfo)
	260	{
	261	strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
	262	strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
	263	}
	264
	265	static const struct ethtool_ops geneve_ethtool_ops = {
	266	.get_drvinfo = geneve_get_drvinfo,
	267	.get_link = ethtool_op_get_link,
	268	};
	269
	270	/* Info for udev, that this is a virtual tunnel endpoint */
	271	static struct device_type geneve_type = {
	272	.name = "geneve",
	273	};
	274
	275	/* Initialize the device structure. */
	276	static void geneve_setup(struct net_device *dev)
	277	{
	278	ether_setup(dev);
	279
	280	dev->netdev_ops = &geneve_netdev_ops;
	281	dev->ethtool_ops = &geneve_ethtool_ops;
	282	dev->destructor = free_netdev;
	283
	284	SET_NETDEV_DEVTYPE(dev, &geneve_type);
285
286	dev->tx_queue_len = 0;
287	dev->features \|= NETIF_F_LLTX;
288	dev->features \|= NETIF_F_SG \| NETIF_F_HW_CSUM;
289	dev->features \|= NETIF_F_RXCSUM;
290	dev->features \|= NETIF_F_GSO_SOFTWARE;
291
292	dev->vlan_features = dev->features;
293	dev->features \|= NETIF_F_HW_VLAN_CTAG_TX \| NETIF_F_HW_VLAN_STAG_TX;
294
295	dev->hw_features \|= NETIF_F_SG \| NETIF_F_HW_CSUM \| NETIF_F_RXCSUM;
296	dev->hw_features \|= NETIF_F_GSO_SOFTWARE;
297	dev->hw_features \|= NETIF_F_HW_VLAN_CTAG_TX \| NETIF_F_HW_VLAN_STAG_TX;
298
299	netif_keep_dst(dev);
300	dev->priv_flags \|= IFF_LIVE_ADDR_CHANGE;
301	}
302
303	static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
304	[IFLA_GENEVE_ID] = { .type = NLA_U32 },
305	[IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
8760ce58	306	[IFLA_GENEVE_TTL] = { .type = NLA_U8 },
d8951125	307	[IFLA_GENEVE_TOS] = { .type = NLA_U8 },
2d07dc79 JL	308	};
	309
	310	static int geneve_validate(struct nlattr tb[], struct nlattr data[])
	311	{
	312	if (tb[IFLA_ADDRESS]) {
	313	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	314	return -EINVAL;
	315
	316	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	317	return -EADDRNOTAVAIL;
	318	}
	319
	320	if (!data)
	321	return -EINVAL;
	322
	323	if (data[IFLA_GENEVE_ID]) {
	324	__u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
	325
	326	if (vni >= GENEVE_VID_MASK)
	327	return -ERANGE;
	328	}
	329
	330	return 0;
	331	}
	332
	333	static int geneve_newlink(struct net net, struct net_device dev,
	334	struct nlattr tb[], struct nlattr data[])
	335	{
	336	struct geneve_net *gn = net_generic(net, geneve_net_id);
	337	struct geneve_dev dummy, geneve = netdev_priv(dev);
	338	struct hlist_head *vni_list_head;
	339	struct sockaddr_in remote; /* IPv4 address for link partner */
	340	__u32 vni, hash;
	341	int err;
	342
	343	if (!data[IFLA_GENEVE_ID] \|\| !data[IFLA_GENEVE_REMOTE])
	344	return -EINVAL;
	345
	346	geneve->net = net;
	347	geneve->dev = dev;
	348
	349	vni = nla_get_u32(data[IFLA_GENEVE_ID]);
	350	geneve->vni[0] = (vni & 0x00ff0000) >> 16;
	351	geneve->vni[1] = (vni & 0x0000ff00) >> 8;
	352	geneve->vni[2] = vni & 0x000000ff;
	353
	354	geneve->remote.sin_addr.s_addr =
	355	nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
	356	if (IN_MULTICAST(ntohl(geneve->remote.sin_addr.s_addr)))
	357	return -EINVAL;
	358
	359	remote = geneve->remote;
	360	hash = geneve_net_vni_hash(geneve->vni);
	361	vni_list_head = &gn->vni_list[hash];
	362	hlist_for_each_entry_rcu(dummy, vni_list_head, hlist) {
	363	if (!memcmp(geneve->vni, dummy->vni, sizeof(dummy->vni)) &&
	364	!memcmp(&remote, &dummy->remote, sizeof(dummy->remote)))
	365	return -EBUSY;
	366	}
	367
	368	if (tb[IFLA_ADDRESS] == NULL)
	369	eth_hw_addr_random(dev);
	370
	371	err = register_netdevice(dev);
372	if (err)
373	return err;
374
8760ce58 JL	375	if (data[IFLA_GENEVE_TTL])
	376	geneve->ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
	377
d8951125 JL	378	if (data[IFLA_GENEVE_TOS])
	379	geneve->tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
	380
2d07dc79 JL	381	list_add(&geneve->next, &gn->geneve_list);
	382
	383	hlist_add_head_rcu(&geneve->hlist, &gn->vni_list[hash]);
	384
	385	return 0;
	386	}
	387
	388	static void geneve_dellink(struct net_device dev, struct list_head head)
	389	{
	390	struct geneve_dev *geneve = netdev_priv(dev);
	391
	392	if (!hlist_unhashed(&geneve->hlist))
	393	hlist_del_rcu(&geneve->hlist);
	394
	395	list_del(&geneve->next);
	396	unregister_netdevice_queue(dev, head);
	397	}
	398
	399	static size_t geneve_get_size(const struct net_device *dev)
	400	{
	401	return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
	402	nla_total_size(sizeof(struct in_addr)) + /* IFLA_GENEVE_REMOTE */
8760ce58	403	nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
d8951125	404	nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
2d07dc79 JL	405	0;
	406	}
	407
	408	static int geneve_fill_info(struct sk_buff skb, const struct net_device dev)
	409	{
	410	struct geneve_dev *geneve = netdev_priv(dev);
	411	__u32 vni;
	412
	413	vni = (geneve->vni[0] << 16) \| (geneve->vni[1] << 8) \| geneve->vni[2];
	414	if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
	415	goto nla_put_failure;
	416
	417	if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
	418	geneve->remote.sin_addr.s_addr))
	419	goto nla_put_failure;
	420
d8951125 JL	421	if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) \|\|
d8951125 JL	422	nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos))
8760ce58 JL	423	goto nla_put_failure;
8760ce58 JL	424
2d07dc79 JL	425	return 0;
	426
	427	nla_put_failure:
	428	return -EMSGSIZE;
	429	}
	430
	431	static struct rtnl_link_ops geneve_link_ops __read_mostly = {
	432	.kind = "geneve",
	433	.maxtype = IFLA_GENEVE_MAX,
	434	.policy = geneve_policy,
	435	.priv_size = sizeof(struct geneve_dev),
	436	.setup = geneve_setup,
	437	.validate = geneve_validate,
	438	.newlink = geneve_newlink,
	439	.dellink = geneve_dellink,
	440	.get_size = geneve_get_size,
	441	.fill_info = geneve_fill_info,
	442	};
	443
	444	static __net_init int geneve_init_net(struct net *net)
	445	{
	446	struct geneve_net *gn = net_generic(net, geneve_net_id);
	447	unsigned int h;
	448
	449	INIT_LIST_HEAD(&gn->geneve_list);
	450
	451	for (h = 0; h < VNI_HASH_SIZE; ++h)
	452	INIT_HLIST_HEAD(&gn->vni_list[h]);
	453
	454	return 0;
	455	}
	456
	457	static void __net_exit geneve_exit_net(struct net *net)
	458	{
	459	struct geneve_net *gn = net_generic(net, geneve_net_id);
	460	struct geneve_dev geneve, next;
	461	struct net_device dev, aux;
	462	LIST_HEAD(list);
	463
	464	rtnl_lock();
	465
	466	/* gather any geneve devices that were moved into this ns */
	467	for_each_netdev_safe(net, dev, aux)
	468	if (dev->rtnl_link_ops == &geneve_link_ops)
	469	unregister_netdevice_queue(dev, &list);
	470
	471	/* now gather any other geneve devices that were created in this ns */
	472	list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
	473	/* If geneve->dev is in the same netns, it was already added
	474	* to the list by the previous loop.
	475	*/
	476	if (!net_eq(dev_net(geneve->dev), net))
	477	unregister_netdevice_queue(geneve->dev, &list);
	478	}
	479
	480	/* unregister the devices gathered above */
	481	unregister_netdevice_many(&list);
	482	rtnl_unlock();
	483	}
	484
	485	static struct pernet_operations geneve_net_ops = {
	486	.init = geneve_init_net,
	487	.exit = geneve_exit_net,
	488	.id = &geneve_net_id,
489	.size = sizeof(struct geneve_net),
490	};
491
492	static int __init geneve_init_module(void)
493	{
494	int rc;
495
496	rc = register_pernet_subsys(&geneve_net_ops);
497	if (rc)
498	goto out1;
499
500	rc = rtnl_link_register(&geneve_link_ops);
501	if (rc)
502	goto out2;
503
504	return 0;
505	out2:
506	unregister_pernet_subsys(&geneve_net_ops);
507	out1:
508	return rc;
509	}
510	late_initcall(geneve_init_module);
511
512	static void __exit geneve_cleanup_module(void)
513	{
514	rtnl_link_unregister(&geneve_link_ops);
515	unregister_pernet_subsys(&geneve_net_ops);
516	}
517	module_exit(geneve_cleanup_module);
518
519	MODULE_LICENSE("GPL");
520	MODULE_VERSION(GENEVE_NETDEV_VER);
521	MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
522	MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
523	MODULE_ALIAS_RTNL_LINK("geneve");