// SPDX-License-Identifier: GPL-2.0-or-later /* * GRE over IPv6 protocol decoder. * * Authors: Dmitry Kozlov ([email protected]) */ #define pr_fmt(fmt) … #include <linux/capability.h> #include <linux/module.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/uaccess.h> #include <linux/skbuff.h> #include <linux/netdevice.h> #include <linux/in.h> #include <linux/tcp.h> #include <linux/udp.h> #include <linux/if_arp.h> #include <linux/init.h> #include <linux/in6.h> #include <linux/inetdevice.h> #include <linux/igmp.h> #include <linux/netfilter_ipv4.h> #include <linux/etherdevice.h> #include <linux/if_ether.h> #include <linux/hash.h> #include <linux/if_tunnel.h> #include <linux/ip6_tunnel.h> #include <net/sock.h> #include <net/ip.h> #include <net/ip_tunnels.h> #include <net/icmp.h> #include <net/protocol.h> #include <net/addrconf.h> #include <net/arp.h> #include <net/checksum.h> #include <net/dsfield.h> #include <net/inet_ecn.h> #include <net/xfrm.h> #include <net/net_namespace.h> #include <net/netns/generic.h> #include <net/rtnetlink.h> #include <net/ipv6.h> #include <net/ip6_fib.h> #include <net/ip6_route.h> #include <net/ip6_tunnel.h> #include <net/gre.h> #include <net/erspan.h> #include <net/dst_metadata.h> static bool log_ecn_error = …; module_param(log_ecn_error, bool, 0644); MODULE_PARM_DESC(…) …; #define IP6_GRE_HASH_SIZE_SHIFT … #define IP6_GRE_HASH_SIZE … static unsigned int ip6gre_net_id __read_mostly; struct ip6gre_net { … }; static struct rtnl_link_ops ip6gre_link_ops __read_mostly; static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly; static int ip6gre_tunnel_init(struct net_device *dev); static void ip6gre_tunnel_setup(struct net_device *dev); static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu); /* Tunnel hash table */ /* 4 hash tables: 3: (remote,local) 2: (remote,*) 1: (*,local) 0: (*,*) We require exact key match i.e. if a key is present in packet it will match only tunnel with the same key; if it is not present, it will match only keyless tunnel. All keysless packets, if not matched configured keyless tunnels will match fallback tunnel. */ #define HASH_KEY(key) … static u32 HASH_ADDR(const struct in6_addr *addr) { … } #define tunnels_r_l … #define tunnels_r … #define tunnels_l … #define tunnels_wc … /* Given src, dst and key, find appropriate for input tunnel. */ static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, const struct in6_addr *remote, const struct in6_addr *local, __be32 key, __be16 gre_proto) { … } static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, const struct __ip6_tnl_parm *p) { … } static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) { … } static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) { … } static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t) { … } static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t) { … } static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, const struct ip6_tnl *t) { … } static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) { … } static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) { … } static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, const struct __ip6_tnl_parm *parms, int type) { … } static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, const struct __ip6_tnl_parm *parms, int create) { … } static void ip6erspan_tunnel_uninit(struct net_device *dev) { … } static void ip6gre_tunnel_uninit(struct net_device *dev) { … } static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, u8 type, u8 code, int offset, __be32 info) { … } static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) { … } static int ip6erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi, int gre_hdr_len) { … } static int gre_rcv(struct sk_buff *skb) { … } static int gre_handle_offloads(struct sk_buff *skb, bool csum) { … } static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev, struct flowi6 *fl6, __u8 *dsfield, int *encap_limit) { … } static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev, struct flowi6 *fl6, __u8 *dsfield, int *encap_limit) { … } static int prepare_ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev, struct flowi6 *fl6, __u8 *dsfield, int *encap_limit) { … } static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb) { … } static netdev_tx_t __gre6_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __be16 proto) { … } static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) { … } static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) { … } static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) { … } static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) { … } static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) { … } static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) { … } static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, int t_hlen) { … } static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) { … } static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) { … } static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) { … } static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, int set_mtu) { … } static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u) { … } static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p) { … } static int ip6gre_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr, void __user *data, int cmd) { … } static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, const void *daddr, const void *saddr, unsigned int len) { … } static const struct header_ops ip6gre_header_ops = …; static const struct net_device_ops ip6gre_netdev_ops = …; static void ip6gre_dev_free(struct net_device *dev) { … } static void ip6gre_tunnel_setup(struct net_device *dev) { … } #define GRE6_FEATURES … static void ip6gre_tnl_init_features(struct net_device *dev) { … } static int ip6gre_tunnel_init_common(struct net_device *dev) { … } static int ip6gre_tunnel_init(struct net_device *dev) { … } static void ip6gre_fb_tunnel_init(struct net_device *dev) { … } static struct inet6_protocol ip6gre_protocol __read_mostly = …; static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) { … } static int __net_init ip6gre_init_net(struct net *net) { … } static void __net_exit ip6gre_exit_batch_rtnl(struct list_head *net_list, struct list_head *dev_to_kill) { … } static struct pernet_operations ip6gre_net_ops = …; static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { … } static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { … } static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { … } static void ip6erspan_set_version(struct nlattr *data[], struct __ip6_tnl_parm *parms) { … } static void ip6gre_netlink_parms(struct nlattr *data[], struct __ip6_tnl_parm *parms) { … } static int ip6gre_tap_init(struct net_device *dev) { … } static const struct net_device_ops ip6gre_tap_netdev_ops = …; static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) { … } static int ip6erspan_tap_init(struct net_device *dev) { … } static const struct net_device_ops ip6erspan_netdev_ops = …; static void ip6gre_tap_setup(struct net_device *dev) { … } static bool ip6gre_netlink_encap_parms(struct nlattr *data[], struct ip_tunnel_encap *ipencap) { … } static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { … } static int ip6gre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { … } static struct ip6_tnl * ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct __ip6_tnl_parm *p_p, struct netlink_ext_ack *extack) { … } static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { … } static void ip6gre_dellink(struct net_device *dev, struct list_head *head) { … } static size_t ip6gre_get_size(const struct net_device *dev) { … } static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) { … } static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = …; static void ip6erspan_tap_setup(struct net_device *dev) { … } static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { … } static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) { … } static int ip6erspan_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, int set_mtu) { … } static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { … } static struct rtnl_link_ops ip6gre_link_ops __read_mostly = …; static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = …; static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = …; /* * And now the modules code and kernel interface. */ static int __init ip6gre_init(void) { … } static void __exit ip6gre_fini(void) { … } module_init(…) …; module_exit(ip6gre_fini); MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_ALIAS_RTNL_LINK(…) …; MODULE_ALIAS_RTNL_LINK(…) …; MODULE_ALIAS_RTNL_LINK(…) …; MODULE_ALIAS_NETDEV(…) …;
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