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linux/drivers/net/bareudp.c

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// SPDX-License-Identifier: GPL-2.0
/* Bareudp: UDP tunnel encasulation for different Payload types like
* MPLS, NSH, IP, etc.
* Copyright (c) 2019 Nokia, Inc.
* Authors: Martin Varghese, <martin.varghese@nokia.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/etherdevice.h>
#include <linux/hash.h>
#include <net/dst_metadata.h>
#include <net/gro_cells.h>
#include <net/rtnetlink.h>
#include <net/protocol.h>
#include <net/ip6_tunnel.h>
#include <net/ip_tunnels.h>
#include <net/udp_tunnel.h>
#include <net/bareudp.h>
#define BAREUDP_BASE_HLEN sizeof(struct udphdr)
#define BAREUDP_IPV4_HLEN (sizeof(struct iphdr) + \
sizeof(struct udphdr))
#define BAREUDP_IPV6_HLEN (sizeof(struct ipv6hdr) + \
sizeof(struct udphdr))
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 */
static unsigned int bareudp_net_id;
struct bareudp_net {
struct list_head bareudp_list;
};
/* Pseudo network device */
struct bareudp_dev {
struct net *net; /* netns for packet i/o */
struct net_device *dev; /* netdev for bareudp tunnel */
__be16 ethertype;
__be16 port;
u16 sport_min;
bool multi_proto_mode;
bool rx_collect_metadata;
struct socket __rcu *sock;
struct list_head next; /* bareudp node on namespace list */
struct gro_cells gro_cells;
};
static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
{
struct metadata_dst *tun_dst = NULL;
struct pcpu_sw_netstats *stats;
struct bareudp_dev *bareudp;
unsigned short family;
unsigned int len;
__be16 proto;
void *oiph;
int err;
bareudp = rcu_dereference_sk_user_data(sk);
if (!bareudp)
goto drop;
if (skb->protocol == htons(ETH_P_IP))
family = AF_INET;
else
family = AF_INET6;
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,
!net_eq(bareudp->net,
dev_net(bareudp->dev)))) {
bareudp->dev->stats.rx_dropped++;
goto drop;
}
if (bareudp->rx_collect_metadata) {
tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0);
if (!tun_dst) {
bareudp->dev->stats.rx_dropped++;
goto drop;
}
skb_dst_set(skb, &tun_dst->dst);
}
skb->dev = bareudp->dev;
oiph = skb_network_header(skb);
skb_reset_network_header(skb);
if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET)
err = IP_ECN_decapsulate(oiph, skb);
else
err = IP6_ECN_decapsulate(oiph, skb);
if (unlikely(err)) {
if (log_ecn_error) {
if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET)
net_info_ratelimited("non-ECT from %pI4 "
"with TOS=%#x\n",
&((struct iphdr *)oiph)->saddr,
((struct iphdr *)oiph)->tos);
else
net_info_ratelimited("non-ECT from %pI6\n",
&((struct ipv6hdr *)oiph)->saddr);
}
if (err > 1) {
++bareudp->dev->stats.rx_frame_errors;
++bareudp->dev->stats.rx_errors;
goto drop;
}
}
len = skb->len;
err = gro_cells_receive(&bareudp->gro_cells, skb);
if (likely(err == NET_RX_SUCCESS)) {
stats = this_cpu_ptr(bareudp->dev->tstats);
u64_stats_update_begin(&stats->syncp);
stats->rx_packets++;
stats->rx_bytes += len;
u64_stats_update_end(&stats->syncp);
}
return 0;
drop:
/* Consume bad packet */
kfree_skb(skb);
return 0;
}
static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb)
{
return 0;
}
static int bareudp_init(struct net_device *dev)
{
struct bareudp_dev *bareudp = netdev_priv(dev);
int err;
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!dev->tstats)
return -ENOMEM;
err = gro_cells_init(&bareudp->gro_cells, dev);
if (err) {
free_percpu(dev->tstats);
return err;
}
return 0;
}
static void bareudp_uninit(struct net_device *dev)
{
struct bareudp_dev *bareudp = netdev_priv(dev);
gro_cells_destroy(&bareudp->gro_cells);
free_percpu(dev->tstats);
}
static struct socket *bareudp_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));
#if IS_ENABLED(CONFIG_IPV6)
udp_conf.family = AF_INET6;
#else
udp_conf.family = AF_INET;
#endif
udp_conf.local_udp_port = port;
/* Open UDP socket */
err = udp_sock_create(net, &udp_conf, &sock);
if (err < 0)
return ERR_PTR(err);
return sock;
}
/* Create new listen socket if needed */
static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port)
{
struct udp_tunnel_sock_cfg tunnel_cfg;
struct socket *sock;
sock = bareudp_create_sock(bareudp->net, 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 = bareudp;
tunnel_cfg.encap_type = 1;
tunnel_cfg.encap_rcv = bareudp_udp_encap_recv;
tunnel_cfg.encap_err_lookup = bareudp_err_lookup;
tunnel_cfg.encap_destroy = NULL;
setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg);
/* As the setup_udp_tunnel_sock does not call udp_encap_enable if the
* socket type is v6 an explicit call to udp_encap_enable is needed.
*/
if (sock->sk->sk_family == AF_INET6)
udp_encap_enable();
rcu_assign_pointer(bareudp->sock, sock);
return 0;
}
static int bareudp_open(struct net_device *dev)
{
struct bareudp_dev *bareudp = netdev_priv(dev);
int ret = 0;
ret = bareudp_socket_create(bareudp, bareudp->port);
return ret;
}
static void bareudp_sock_release(struct bareudp_dev *bareudp)
{
struct socket *sock;
sock = bareudp->sock;
rcu_assign_pointer(bareudp->sock, NULL);
synchronize_net();
udp_tunnel_sock_release(sock);
}
static int bareudp_stop(struct net_device *dev)
{
struct bareudp_dev *bareudp = netdev_priv(dev);
bareudp_sock_release(bareudp);
return 0;
}
static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev,
struct bareudp_dev *bareudp,
const struct ip_tunnel_info *info)
{
bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
struct socket *sock = rcu_dereference(bareudp->sock);
bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
const struct ip_tunnel_key *key = &info->key;
struct rtable *rt;
__be16 sport, df;
int min_headroom;
__u8 tos, ttl;
__be32 saddr;
int err;
if (!sock)
return -ESHUTDOWN;
rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info,
IPPROTO_UDP, use_cache);
if (IS_ERR(rt))
return PTR_ERR(rt);
skb_tunnel_check_pmtu(skb, &rt->dst,
BAREUDP_IPV4_HLEN + info->options_len);
sport = udp_flow_src_port(bareudp->net, skb,
bareudp->sport_min, USHRT_MAX,
true);
tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
ttl = key->ttl;
df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
skb_scrub_packet(skb, xnet);
err = -ENOSPC;
if (!skb_pull(skb, skb_network_offset(skb)))
goto free_dst;
min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len +
BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
err = skb_cow_head(skb, min_headroom);
if (unlikely(err))
goto free_dst;
err = udp_tunnel_handle_offloads(skb, udp_sum);
if (err)
goto free_dst;
skb_set_inner_protocol(skb, bareudp->ethertype);
udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst,
tos, ttl, df, sport, bareudp->port,
!net_eq(bareudp->net, dev_net(bareudp->dev)),
!(info->key.tun_flags & TUNNEL_CSUM));
return 0;
free_dst:
dst_release(&rt->dst);
return err;
}
static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
struct bareudp_dev *bareudp,
const struct ip_tunnel_info *info)
{
bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
struct socket *sock = rcu_dereference(bareudp->sock);
bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
const struct ip_tunnel_key *key = &info->key;
struct dst_entry *dst = NULL;
struct in6_addr saddr, daddr;
int min_headroom;
__u8 prio, ttl;
__be16 sport;
int err;
if (!sock)
return -ESHUTDOWN;
dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info,
IPPROTO_UDP, use_cache);
if (IS_ERR(dst))
return PTR_ERR(dst);
skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len);
sport = udp_flow_src_port(bareudp->net, skb,
bareudp->sport_min, USHRT_MAX,
true);
prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
ttl = key->ttl;
skb_scrub_packet(skb, xnet);
err = -ENOSPC;
if (!skb_pull(skb, skb_network_offset(skb)))
goto free_dst;
min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
err = skb_cow_head(skb, min_headroom);
if (unlikely(err))
goto free_dst;
err = udp_tunnel_handle_offloads(skb, udp_sum);
if (err)
goto free_dst;
daddr = info->key.u.ipv6.dst;
udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev,
&saddr, &daddr, prio, ttl,
info->key.label, sport, bareudp->port,
!(info->key.tun_flags & TUNNEL_CSUM));
return 0;
free_dst:
dst_release(dst);
return err;
}
static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct bareudp_dev *bareudp = netdev_priv(dev);
struct ip_tunnel_info *info = NULL;
int err;
if (skb->protocol != bareudp->ethertype) {
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);
if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
err = -EINVAL;
goto tx_error;
}
rcu_read_lock();
if (IS_ENABLED(CONFIG_IPV6) && info->mode & IP_TUNNEL_INFO_IPV6)
err = bareudp6_xmit_skb(skb, dev, bareudp, info);
else
err = bareudp_xmit_skb(skb, dev, bareudp, info);
rcu_read_unlock();
if (likely(!err))
return NETDEV_TX_OK;
tx_error:
dev_kfree_skb(skb);
if (err == -ELOOP)
dev->stats.collisions++;
else if (err == -ENETUNREACH)
dev->stats.tx_carrier_errors++;
dev->stats.tx_errors++;
return NETDEV_TX_OK;
}
static int bareudp_fill_metadata_dst(struct net_device *dev,
struct sk_buff *skb)
{
struct ip_tunnel_info *info = skb_tunnel_info(skb);
struct bareudp_dev *bareudp = netdev_priv(dev);
bool use_cache;
use_cache = ip_tunnel_dst_cache_usable(skb, info);
if (!IS_ENABLED(CONFIG_IPV6) || ip_tunnel_info_af(info) == AF_INET) {
struct rtable *rt;
__be32 saddr;
rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr,
info, IPPROTO_UDP, use_cache);
if (IS_ERR(rt))
return PTR_ERR(rt);
ip_rt_put(rt);
info->key.u.ipv4.src = saddr;
} else if (ip_tunnel_info_af(info) == AF_INET6) {
struct dst_entry *dst;
struct in6_addr saddr;
struct socket *sock = rcu_dereference(bareudp->sock);
dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock,
&saddr, info, IPPROTO_UDP,
use_cache);
if (IS_ERR(dst))
return PTR_ERR(dst);
dst_release(dst);
info->key.u.ipv6.src = saddr;
} else {
return -EINVAL;
}
info->key.tp_src = udp_flow_src_port(bareudp->net, skb,
bareudp->sport_min,
USHRT_MAX, true);
info->key.tp_dst = bareudp->port;
return 0;
}
static const struct net_device_ops bareudp_netdev_ops = {
.ndo_init = bareudp_init,
.ndo_uninit = bareudp_uninit,
.ndo_open = bareudp_open,
.ndo_stop = bareudp_stop,
.ndo_start_xmit = bareudp_xmit,
.ndo_get_stats64 = ip_tunnel_get_stats64,
.ndo_fill_metadata_dst = bareudp_fill_metadata_dst,
};
static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = {
[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 */
static struct device_type bareudp_type = {
.name = "bareudp",
};
/* Initialize the device structure. */
static void bareudp_setup(struct net_device *dev)
{
dev->netdev_ops = &bareudp_netdev_ops;
dev->needs_free_netdev = true;
SET_NETDEV_DEVTYPE(dev, &bareudp_type);
dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
dev->features |= NETIF_F_RXCSUM;
dev->features |= NETIF_F_GSO_SOFTWARE;
dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
dev->hard_header_len = 0;
dev->addr_len = 0;
dev->mtu = ETH_DATA_LEN;
dev->min_mtu = IPV4_MIN_MTU;
dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN;
dev->type = ARPHRD_NONE;
netif_keep_dst(dev);
dev->priv_flags |= IFF_NO_QUEUE;
dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
}
static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
if (!data) {
NL_SET_ERR_MSG(extack,
"Not enough attributes provided to perform the operation");
return -EINVAL;
}
return 0;
}
static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf,
struct netlink_ext_ack *extack)
{
memset(conf, 0, sizeof(*conf));
if (!data[IFLA_BAREUDP_PORT]) {
NL_SET_ERR_MSG(extack, "port not specified");
return -EINVAL;
}
if (!data[IFLA_BAREUDP_ETHERTYPE]) {
NL_SET_ERR_MSG(extack, "ethertype not specified");
return -EINVAL;
}
if (data[IFLA_BAREUDP_PORT])
conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]);
if (data[IFLA_BAREUDP_ETHERTYPE])
conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]);
if (data[IFLA_BAREUDP_SRCPORT_MIN])
conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]);
if (data[IFLA_BAREUDP_MULTIPROTO_MODE])
conf->multi_proto_mode = true;
if (data[IFLA_BAREUDP_RX_COLLECT_METADATA])
conf->rx_collect_metadata = true;
return 0;
}
static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn,
const struct bareudp_conf *conf)
{
struct bareudp_dev *bareudp, *t = NULL;
list_for_each_entry(bareudp, &bn->bareudp_list, next) {
if (conf->port == bareudp->port)
t = bareudp;
}
return t;
}
static int bareudp_configure(struct net *net, struct net_device *dev,
struct bareudp_conf *conf)
{
struct bareudp_net *bn = net_generic(net, bareudp_net_id);
struct bareudp_dev *t, *bareudp = netdev_priv(dev);
int err;
bareudp->net = net;
bareudp->dev = dev;
t = bareudp_find_dev(bn, conf);
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;
bareudp->rx_collect_metadata = conf->rx_collect_metadata;
err = register_netdevice(dev);
if (err)
return err;
list_add(&bareudp->next, &bn->bareudp_list);
return 0;
}
static int bareudp_link_config(struct net_device *dev,
struct nlattr *tb[])
{
int err;
if (tb[IFLA_MTU]) {
err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
if (err)
return err;
}
return 0;
}
static int bareudp_newlink(struct net *net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct bareudp_conf conf;
int err;
err = bareudp2info(data, &conf, extack);
if (err)
return err;
err = bareudp_configure(net, dev, &conf);
if (err)
return err;
err = bareudp_link_config(dev, tb);
if (err)
return err;
return 0;
}
static void bareudp_dellink(struct net_device *dev, struct list_head *head)
{
struct bareudp_dev *bareudp = netdev_priv(dev);
list_del(&bareudp->next);
unregister_netdevice_queue(dev, head);
}
static size_t bareudp_get_size(const struct net_device *dev)
{
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 */
nla_total_size(0) + /* IFLA_BAREUDP_RX_COLLECT_METADATA */
0;
}
static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
struct bareudp_dev *bareudp = netdev_priv(dev);
if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port))
goto nla_put_failure;
if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype))
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;
if (bareudp->rx_collect_metadata &&
nla_put_flag(skb, IFLA_BAREUDP_RX_COLLECT_METADATA))
goto nla_put_failure;
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static struct rtnl_link_ops bareudp_link_ops __read_mostly = {
.kind = "bareudp",
.maxtype = IFLA_BAREUDP_MAX,
.policy = bareudp_policy,
.priv_size = sizeof(struct bareudp_dev),
.setup = bareudp_setup,
.validate = bareudp_validate,
.newlink = bareudp_newlink,
.dellink = bareudp_dellink,
.get_size = bareudp_get_size,
.fill_info = bareudp_fill_info,
};
struct net_device *bareudp_dev_create(struct net *net, const char *name,
u8 name_assign_type,
struct bareudp_conf *conf)
{
struct nlattr *tb[IFLA_MAX + 1];
struct net_device *dev;
LIST_HEAD(list_kill);
int err;
memset(tb, 0, sizeof(tb));
dev = rtnl_create_link(net, name, name_assign_type,
&bareudp_link_ops, tb, NULL);
if (IS_ERR(dev))
return dev;
err = bareudp_configure(net, dev, conf);
if (err) {
free_netdev(dev);
return ERR_PTR(err);
}
err = dev_set_mtu(dev, IP_MAX_MTU - BAREUDP_BASE_HLEN);
if (err)
goto err;
err = rtnl_configure_link(dev, NULL);
if (err < 0)
goto err;
return dev;
err:
bareudp_dellink(dev, &list_kill);
unregister_netdevice_many(&list_kill);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(bareudp_dev_create);
static __net_init int bareudp_init_net(struct net *net)
{
struct bareudp_net *bn = net_generic(net, bareudp_net_id);
INIT_LIST_HEAD(&bn->bareudp_list);
return 0;
}
static void bareudp_destroy_tunnels(struct net *net, struct list_head *head)
{
struct bareudp_net *bn = net_generic(net, bareudp_net_id);
struct bareudp_dev *bareudp, *next;
list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next)
unregister_netdevice_queue(bareudp->dev, head);
}
static void __net_exit bareudp_exit_batch_net(struct list_head *net_list)
{
struct net *net;
LIST_HEAD(list);
rtnl_lock();
list_for_each_entry(net, net_list, exit_list)
bareudp_destroy_tunnels(net, &list);
/* unregister the devices gathered above */
unregister_netdevice_many(&list);
rtnl_unlock();
}
static struct pernet_operations bareudp_net_ops = {
.init = bareudp_init_net,
.exit_batch = bareudp_exit_batch_net,
.id = &bareudp_net_id,
.size = sizeof(struct bareudp_net),
};
static int __init bareudp_init_module(void)
{
int rc;
rc = register_pernet_subsys(&bareudp_net_ops);
if (rc)
goto out1;
rc = rtnl_link_register(&bareudp_link_ops);
if (rc)
goto out2;
return 0;
out2:
unregister_pernet_subsys(&bareudp_net_ops);
out1:
return rc;
}
late_initcall(bareudp_init_module);
static void __exit bareudp_cleanup_module(void)
{
rtnl_link_unregister(&bareudp_link_ops);
unregister_pernet_subsys(&bareudp_net_ops);
}
module_exit(bareudp_cleanup_module);
MODULE_ALIAS_RTNL_LINK("bareudp");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>");
MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic");
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