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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#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; struct mutex lock;};
struct bareudp_conf { __be16 ethertype; __be16 port; u16 sport_min; bool multi_proto_mode;};
/* 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; struct sock __rcu *sk; 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; IP_TUNNEL_DECLARE_FLAGS(key) = { }; struct bareudp_dev *bareudp; unsigned short family; unsigned int len; __be16 proto; void *oiph; int err; int nh;
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)) { __u8 ipversion;
if (skb_copy_bits(skb, BAREUDP_BASE_HLEN, &ipversion, sizeof(ipversion))) { dev_dstats_rx_dropped(bareudp->dev); goto drop; } ipversion >>= 4;
if (ipversion == 4) { proto = htons(ETH_P_IP); } else if (ipversion == 6 && bareudp->multi_proto_mode) { proto = htons(ETH_P_IPV6); } else { dev_dstats_rx_dropped(bareudp->dev); 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 { dev_dstats_rx_dropped(bareudp->dev); 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 { dev_dstats_rx_dropped(bareudp->dev); goto drop; } } } else { proto = bareudp->ethertype; }
if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN, proto, !net_eq(bareudp->net, dev_net(bareudp->dev)))) { dev_dstats_rx_dropped(bareudp->dev); goto drop; }
__set_bit(IP_TUNNEL_KEY_BIT, key);
tun_dst = udp_tun_rx_dst(skb, family, key, 0, 0); if (!tun_dst) { dev_dstats_rx_dropped(bareudp->dev); goto drop; } skb_dst_set(skb, &tun_dst->dst); skb->dev = bareudp->dev; skb_reset_mac_header(skb);
/* Save offset of outer header relative to skb->head, * because we are going to reset the network header to the inner header * and might change skb->head. */ nh = skb_network_header(skb) - skb->head;
skb_reset_network_header(skb);
if (!pskb_inet_may_pull(skb)) { DEV_STATS_INC(bareudp->dev, rx_length_errors); DEV_STATS_INC(bareudp->dev, rx_errors); goto drop; }
/* Get the outer header. */ oiph = skb->head + nh;
if (!ipv6_mod_enabled() || family == AF_INET) err = IP_ECN_decapsulate(oiph, skb); else err = IP6_ECN_decapsulate(oiph, skb);
if (unlikely(err)) { if (log_ecn_error) { if (!ipv6_mod_enabled() || 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) { DEV_STATS_INC(bareudp->dev, rx_frame_errors); DEV_STATS_INC(bareudp->dev, rx_errors); goto drop; } }
len = skb->len; err = gro_cells_receive(&bareudp->gro_cells, skb); if (likely(err == NET_RX_SUCCESS)) dev_dstats_rx_add(bareudp->dev, len);
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;
err = gro_cells_init(&bareudp->gro_cells, dev); if (err) 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);}
static struct sock *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 (ipv6_mod_enabled()) udp_conf.family = AF_INET6; else udp_conf.family = AF_INET;
udp_conf.local_udp_port = port; /* Open UDP socket */ err = udp_sock_create(net, &udp_conf, &sock); if (err < 0) return ERR_PTR(err);
udp_allow_gso(sock->sk); return sock->sk;}
/* 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 sock *sk;
sk = bareudp_create_sock(bareudp->net, port); if (IS_ERR(sk)) return PTR_ERR(sk);
/* 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, sk, &tunnel_cfg);
rcu_assign_pointer(bareudp->sk, sk); return 0;}
static int bareudp_open(struct net_device *dev){ struct bareudp_dev *bareudp = netdev_priv(dev);
return bareudp_socket_create(bareudp, bareudp->port);}
static void bareudp_sock_release(struct bareudp_dev *bareudp){ struct sock *sk;
sk = rtnl_dereference(bareudp->sk); rcu_assign_pointer(bareudp->sk, NULL); udp_tunnel_sock_release(sk);}
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 udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); bool use_cache = ip_tunnel_dst_cache_usable(skb, info); struct sock *sk = rcu_dereference(bareudp->sk); 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 (skb_vlan_inet_prepare(skb, skb->protocol != htons(ETH_P_TEB))) return -EINVAL;
if (!sk) return -ESHUTDOWN;
sport = udp_flow_src_port(bareudp->net, skb, bareudp->sport_min, USHRT_MAX, true); rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, 0, &saddr, &info->key, sport, bareudp->port, key->tos, use_cache ? (struct dst_cache *)&info->dst_cache : NULL);
if (IS_ERR(rt)) return PTR_ERR(rt);
skb_tunnel_check_pmtu(skb, &rt->dst, BAREUDP_IPV4_HLEN + info->options_len, false);
tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); ttl = key->ttl; df = test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, key->tun_flags) ? 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, skb->protocol); udp_tunnel_xmit_skb(rt, sk, skb, saddr, info->key.u.ipv4.dst, tos, ttl, df, sport, bareudp->port, !net_eq(bareudp->net, dev_net(bareudp->dev)), !test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags), 0); 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 udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev)); bool use_cache = ip_tunnel_dst_cache_usable(skb, info); struct sock *sk = rcu_dereference(bareudp->sk); 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 (skb_vlan_inet_prepare(skb, skb->protocol != htons(ETH_P_TEB))) return -EINVAL;
if (!sk) return -ESHUTDOWN;
sport = udp_flow_src_port(bareudp->net, skb, bareudp->sport_min, USHRT_MAX, true); dst = udp_tunnel6_dst_lookup(skb, dev, bareudp->net, sk, 0, &saddr, key, sport, bareudp->port, key->tos, use_cache ? (struct dst_cache *) &info->dst_cache : NULL); if (IS_ERR(dst)) return PTR_ERR(dst);
skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len, false);
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 ipv6hdr);
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, skb->protocol); daddr = info->key.u.ipv6.dst; udp_tunnel6_xmit_skb(dst, sk, skb, dev, &saddr, &daddr, prio, ttl, info->key.label, sport, bareudp->port, !test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags), 0); return 0;
free_dst: dst_release(dst); return err;}
static bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto){ if (bareudp->ethertype == proto) return true;
if (!bareudp->multi_proto_mode) return false;
if (bareudp->ethertype == htons(ETH_P_MPLS_UC) && proto == htons(ETH_P_MPLS_MC)) return true;
if (bareudp->ethertype == htons(ETH_P_IP) && proto == htons(ETH_P_IPV6)) return true;
return false;}
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 (!bareudp_proto_valid(bareudp, skb->protocol)) { 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 (ipv6_mod_enabled() && 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_INC(dev, collisions); else if (err == -ENETUNREACH) DEV_STATS_INC(dev, tx_carrier_errors);
DEV_STATS_INC(dev, 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; __be16 sport;
use_cache = ip_tunnel_dst_cache_usable(skb, info); sport = udp_flow_src_port(bareudp->net, skb, bareudp->sport_min, USHRT_MAX, true);
if (!ipv6_mod_enabled() || ip_tunnel_info_af(info) == AF_INET) { struct rtable *rt; __be32 saddr;
rt = udp_tunnel_dst_lookup(skb, dev, bareudp->net, 0, &saddr, &info->key, sport, bareudp->port, info->key.tos, use_cache ? &info->dst_cache : NULL); 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 sock *sk;
sk = rcu_dereference(bareudp->sk); if (!sk) return -ESHUTDOWN;
dst = udp_tunnel6_dst_lookup(skb, dev, bareudp->net, sk, 0, &saddr, &info->key, sport, bareudp->port, info->key.tos, use_cache ? &info->dst_cache : NULL); if (IS_ERR(dst)) return PTR_ERR(dst);
dst_release(dst); info->key.u.ipv6.src = saddr; } else { return -EINVAL; }
info->key.tp_src = sport; 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_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 const 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 | NETIF_F_FRAGLIST; dev->features |= NETIF_F_RXCSUM; dev->features |= NETIF_F_GSO_SOFTWARE; dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; dev->hw_features |= 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); netif_set_tso_max_size(dev, GSO_MAX_SIZE); dev->priv_flags |= IFF_NO_QUEUE; dev->lltx = true; dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS;}
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; }
conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]); 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;
return 0;}
static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn, const struct bareudp_conf *conf){ struct bareudp_dev *bareudp, *t = NULL;
mutex_lock(&bn->lock);
list_for_each_entry(bareudp, &bn->bareudp_list, next) { if (conf->port == bareudp->port) t = bareudp; }
mutex_unlock(&bn->lock);
return t;}
static int bareudp_configure(struct net *net, struct net_device *dev, struct bareudp_conf *conf, struct netlink_ext_ack *extack){ 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) { NL_SET_ERR_MSG(extack, "Another bareudp device using the same port already exists"); return -EBUSY; }
if (conf->multi_proto_mode && (conf->ethertype != htons(ETH_P_MPLS_UC) && conf->ethertype != htons(ETH_P_IP))) { NL_SET_ERR_MSG(extack, "Cannot set multiproto mode for this ethertype (only IPv4 and unicast MPLS are supported)"); return -EINVAL; }
bareudp->port = conf->port; bareudp->ethertype = conf->ethertype; bareudp->sport_min = conf->sport_min; bareudp->multi_proto_mode = conf->multi_proto_mode;
err = register_netdevice(dev); if (err) return err;
mutex_lock(&bn->lock); list_add(&bareudp->next, &bn->bareudp_list); mutex_unlock(&bn->lock);
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 void __bareudp_dellink(struct net *net, struct net_device *dev, struct list_head *head){ struct bareudp_dev *bareudp = netdev_priv(dev);
list_del_init(&bareudp->next); unregister_netdevice_queue_net(net, dev, head);}
static void bareudp_dellink(struct net_device *dev, struct list_head *head){ struct bareudp_dev *bareudp = netdev_priv(dev); struct bareudp_net *bn;
bn = net_generic(bareudp->net, bareudp_net_id);
mutex_lock(&bn->lock); if (!list_empty(&bareudp->next)) __bareudp_dellink(dev_net(dev), dev, head); mutex_unlock(&bn->lock);}
static int bareudp_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack){ struct net *link_net = rtnl_newlink_link_net(params); struct nlattr **data = params->data; struct nlattr **tb = params->tb; struct bareudp_conf conf; int err;
err = bareudp2info(data, &conf, extack); if (err) return err;
err = bareudp_configure(link_net, dev, &conf, extack); if (err) return err;
err = bareudp_link_config(dev, tb); if (err) goto err_unconfig;
return 0;
err_unconfig: bareudp_dellink(dev, NULL); return err;}
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 */ 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;
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,};
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); mutex_init(&bn->lock);
return 0;}
static void __net_exit bareudp_exit_rtnl_net(struct net *net, struct list_head *dev_kill_list){ struct bareudp_net *bn = net_generic(net, bareudp_net_id); struct bareudp_dev *bareudp, *next;
mutex_lock(&bn->lock);
list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next) __bareudp_dellink(net, bareudp->dev, dev_kill_list);
mutex_unlock(&bn->lock);}
static void __net_exit bareudp_exit_net(struct net *net){ struct bareudp_net *bn = net_generic(net, bareudp_net_id);
WARN_ON_ONCE(!list_empty(&bn->bareudp_list));}
static struct pernet_operations bareudp_net_ops = { .init = bareudp_init_net, .exit_rtnl = bareudp_exit_rtnl_net, .exit = bareudp_exit_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");