// SPDX-License-Identifier: GPL-2.0-or-later /* GTP according to GSM TS 09.60 / 3GPP TS 29.060 * * (C) 2012-2014 by sysmocom - s.f.m.c. GmbH * (C) 2016 by Pablo Neira Ayuso <[email protected]> * * Author: Harald Welte <[email protected]> * Pablo Neira Ayuso <[email protected]> * Andreas Schultz <[email protected]> */ #define pr_fmt(fmt) … #include <linux/module.h> #include <linux/skbuff.h> #include <linux/udp.h> #include <linux/rculist.h> #include <linux/jhash.h> #include <linux/if_tunnel.h> #include <linux/net.h> #include <linux/file.h> #include <linux/gtp.h> #include <net/net_namespace.h> #include <net/protocol.h> #include <net/ip.h> #include <net/ipv6.h> #include <net/udp.h> #include <net/udp_tunnel.h> #include <net/icmp.h> #include <net/xfrm.h> #include <net/genetlink.h> #include <net/netns/generic.h> #include <net/gtp.h> /* An active session for the subscriber. */ struct pdp_ctx { … }; /* One instance of the GTP device. */ struct gtp_dev { … }; struct echo_info { … }; static unsigned int gtp_net_id __read_mostly; struct gtp_net { … }; static u32 gtp_h_initval; static struct genl_family gtp_genl_family; enum gtp_multicast_groups { … }; static const struct genl_multicast_group gtp_genl_mcgrps[] = …; static void pdp_context_delete(struct pdp_ctx *pctx); static inline u32 gtp0_hashfn(u64 tid) { … } static inline u32 gtp1u_hashfn(u32 tid) { … } static inline u32 ipv4_hashfn(__be32 ip) { … } static u32 ipv6_hashfn(const struct in6_addr *ip6) { … } /* Resolve a PDP context structure based on the 64bit TID. */ static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid, u16 family) { … } /* Resolve a PDP context structure based on the 32bit TEI. */ static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid, u16 family) { … } /* Resolve a PDP context based on IPv4 address of MS. */ static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr) { … } /* 3GPP TS 29.060: PDN Connection: the association between a MS represented by * [...] one IPv6 *prefix* and a PDN represented by an APN. * * Then, 3GPP TS 29.061, Section 11.2.1.3 says: The size of the prefix shall be * according to the maximum prefix length for a global IPv6 address as * specified in the IPv6 Addressing Architecture, see RFC 4291. * * Finally, RFC 4291 section 2.5.4 states: All Global Unicast addresses other * than those that start with binary 000 have a 64-bit interface ID field * (i.e., n + m = 64). */ static bool ipv6_pdp_addr_equal(const struct in6_addr *a, const struct in6_addr *b) { … } static struct pdp_ctx *ipv6_pdp_find(struct gtp_dev *gtp, const struct in6_addr *ms_addr) { … } static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx, unsigned int hdrlen, unsigned int role) { … } static bool gtp_check_ms_ipv6(struct sk_buff *skb, struct pdp_ctx *pctx, unsigned int hdrlen, unsigned int role) { … } /* Check if the inner IP address in this packet is assigned to any * existing mobile subscriber. */ static bool gtp_check_ms(struct sk_buff *skb, struct pdp_ctx *pctx, unsigned int hdrlen, unsigned int role, __u16 inner_proto) { … } static int gtp_inner_proto(struct sk_buff *skb, unsigned int hdrlen, __u16 *inner_proto) { … } static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb, unsigned int hdrlen, unsigned int role, __u16 inner_proto) { … } static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4, const struct sock *sk, __be32 daddr, __be32 saddr) { … } static struct rt6_info *ip6_route_output_gtp(struct net *net, struct flowi6 *fl6, const struct sock *sk, const struct in6_addr *daddr, struct in6_addr *saddr) { … } /* GSM TS 09.60. 7.3 * In all Path Management messages: * - TID: is not used and shall be set to 0. * - Flow Label is not used and shall be set to 0 * In signalling messages: * - number: this field is not yet used in signalling messages. * It shall be set to 255 by the sender and shall be ignored * by the receiver * Returns true if the echo req was correct, false otherwise. */ static bool gtp0_validate_echo_hdr(struct gtp0_header *gtp0) { … } /* msg_type has to be GTP_ECHO_REQ or GTP_ECHO_RSP */ static void gtp0_build_echo_msg(struct gtp0_header *hdr, __u8 msg_type) { … } static int gtp0_send_echo_resp_ip(struct gtp_dev *gtp, struct sk_buff *skb) { … } static int gtp0_send_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb) { … } static int gtp_genl_fill_echo(struct sk_buff *skb, u32 snd_portid, u32 snd_seq, int flags, u32 type, struct echo_info echo) { … } static void gtp0_handle_echo_resp_ip(struct sk_buff *skb, struct echo_info *echo) { … } static int gtp0_handle_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb) { … } static int gtp_proto_to_family(__u16 proto) { … } /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) { … } /* msg_type has to be GTP_ECHO_REQ or GTP_ECHO_RSP */ static void gtp1u_build_echo_msg(struct gtp1_header_long *hdr, __u8 msg_type) { … } static int gtp1u_send_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb) { … } static int gtp1u_handle_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb) { … } static int gtp_parse_exthdrs(struct sk_buff *skb, unsigned int *hdrlen) { … } static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) { … } static void __gtp_encap_destroy(struct sock *sk) { … } static void gtp_encap_destroy(struct sock *sk) { … } static void gtp_encap_disable_sock(struct sock *sk) { … } static void gtp_encap_disable(struct gtp_dev *gtp) { … } /* UDP encapsulation receive handler. See net/ipv4/udp.c. * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket. */ static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) { … } static void gtp_dev_uninit(struct net_device *dev) { … } static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) { … } static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) { … } struct gtp_pktinfo { … }; static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo) { … } static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo, struct sock *sk, __u8 tos, struct pdp_ctx *pctx, struct rtable *rt, struct flowi4 *fl4, struct net_device *dev) { … } static void gtp_set_pktinfo_ipv6(struct gtp_pktinfo *pktinfo, struct sock *sk, __u8 tos, struct pdp_ctx *pctx, struct rt6_info *rt6, struct flowi6 *fl6, struct net_device *dev) { … } static int gtp_build_skb_outer_ip4(struct sk_buff *skb, struct net_device *dev, struct gtp_pktinfo *pktinfo, struct pdp_ctx *pctx, __u8 tos, __be16 frag_off) { … } static int gtp_build_skb_outer_ip6(struct net *net, struct sk_buff *skb, struct net_device *dev, struct gtp_pktinfo *pktinfo, struct pdp_ctx *pctx, __u8 tos) { … } static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, struct gtp_pktinfo *pktinfo) { … } static int gtp_build_skb_ip6(struct sk_buff *skb, struct net_device *dev, struct gtp_pktinfo *pktinfo) { … } static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev) { … } static const struct net_device_ops gtp_netdev_ops = …; static const struct device_type gtp_type = …; #define GTP_TH_MAXLEN … #define GTP_IPV4_MAXLEN … static void gtp_link_setup(struct net_device *dev) { … } static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize); static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]); static void gtp_destructor(struct net_device *dev) { … } static int gtp_sock_udp_config(struct udp_port_cfg *udp_conf, const struct nlattr *nla, int family) { … } static struct sock *gtp_create_sock(int type, struct gtp_dev *gtp, const struct nlattr *nla, int family) { … } static int gtp_create_sockets(struct gtp_dev *gtp, const struct nlattr *nla, int family) { … } #define GTP_TH_MAXLEN … #define GTP_IPV6_MAXLEN … static int gtp_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { … } static void gtp_dellink(struct net_device *dev, struct list_head *head) { … } static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = …; static int gtp_validate(struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { … } static size_t gtp_get_size(const struct net_device *dev) { … } static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev) { … } static struct rtnl_link_ops gtp_link_ops __read_mostly = …; static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize) { … } static struct sock *gtp_encap_enable_socket(int fd, int type, struct gtp_dev *gtp) { … } static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]) { … } static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[]) { … } static void gtp_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info) { … } static void ip_pdp_peer_fill(struct pdp_ctx *pctx, struct genl_info *info) { … } static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info) { … } static bool ipv6_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info) { … } static struct pdp_ctx *gtp_pdp_add(struct gtp_dev *gtp, struct sock *sk, struct genl_info *info) { … } static void pdp_context_free(struct rcu_head *head) { … } static void pdp_context_delete(struct pdp_ctx *pctx) { … } static int gtp_tunnel_notify(struct pdp_ctx *pctx, u8 cmd, gfp_t allocation); static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info) { … } static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net, struct nlattr *nla[]) { … } static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[]) { … } static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info) { … } static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq, int flags, u32 type, struct pdp_ctx *pctx) { … } static int gtp_tunnel_notify(struct pdp_ctx *pctx, u8 cmd, gfp_t allocation) { … } static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info) { … } static int gtp_genl_dump_pdp(struct sk_buff *skb, struct netlink_callback *cb) { … } static int gtp_genl_send_echo_req(struct sk_buff *skb, struct genl_info *info) { … } static const struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = …; static const struct genl_small_ops gtp_genl_ops[] = …; static struct genl_family gtp_genl_family __ro_after_init = …; static int __net_init gtp_net_init(struct net *net) { … } static void __net_exit gtp_net_exit_batch_rtnl(struct list_head *net_list, struct list_head *dev_to_kill) { … } static struct pernet_operations gtp_net_ops = …; static int __init gtp_init(void) { … } late_initcall(gtp_init); static void __exit gtp_fini(void) { … } module_exit(gtp_fini); MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_ALIAS_RTNL_LINK(…) …; MODULE_ALIAS_GENL_FAMILY(…) …;
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