// SPDX-License-Identifier: GPL-2.0-only /* * Generic HDLC support routines for Linux * Frame Relay support * * Copyright (C) 1999 - 2006 Krzysztof Halasa <[email protected]> * Theory of PVC state DCE mode: (exist,new) -> 0,0 when "PVC create" or if "link unreliable" 0,x -> 1,1 if "link reliable" when sending FULL STATUS 1,1 -> 1,0 if received FULL STATUS ACK (active) -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create" -> 1 when "PVC up" and (exist,new) = 1,0 DTE mode: (exist,new,active) = FULL STATUS if "link reliable" = 0, 0, 0 if "link unreliable" No LMI: active = open and "link reliable" exist = new = not used CCITT LMI: ITU-T Q.933 Annex A ANSI LMI: ANSI T1.617 Annex D CISCO LMI: the original, aka "Gang of Four" LMI */ #include <linux/errno.h> #include <linux/etherdevice.h> #include <linux/hdlc.h> #include <linux/if_arp.h> #include <linux/inetdevice.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/pkt_sched.h> #include <linux/poll.h> #include <linux/rtnetlink.h> #include <linux/skbuff.h> #include <linux/slab.h> #undef DEBUG_PKT #undef DEBUG_ECN #undef DEBUG_LINK #undef DEBUG_PROTO #undef DEBUG_PVC #define FR_UI … #define FR_PAD … #define NLPID_IP … #define NLPID_IPV6 … #define NLPID_SNAP … #define NLPID_PAD … #define NLPID_CCITT_ANSI_LMI … #define NLPID_CISCO_LMI … #define LMI_CCITT_ANSI_DLCI … #define LMI_CISCO_DLCI … #define LMI_CALLREF … #define LMI_ANSI_LOCKSHIFT … #define LMI_ANSI_CISCO_REPTYPE … #define LMI_CCITT_REPTYPE … #define LMI_ANSI_CISCO_ALIVE … #define LMI_CCITT_ALIVE … #define LMI_ANSI_CISCO_PVCSTAT … #define LMI_CCITT_PVCSTAT … #define LMI_FULLREP … #define LMI_INTEGRITY … #define LMI_SINGLE … #define LMI_STATUS_ENQUIRY … #define LMI_STATUS … #define LMI_REPT_LEN … #define LMI_INTEG_LEN … #define LMI_CCITT_CISCO_LENGTH … #define LMI_ANSI_LENGTH … struct fr_hdr { … } __packed; struct pvc_device { … }; struct frad_state { … }; static int fr_ioctl(struct net_device *dev, struct if_settings *ifs); static inline u16 q922_to_dlci(u8 *hdr) { … } static inline void dlci_to_q922(u8 *hdr, u16 dlci) { … } static inline struct frad_state *state(hdlc_device *hdlc) { … } static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci) { … } static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci) { … } static inline int pvc_is_used(struct pvc_device *pvc) { … } static inline void pvc_carrier(int on, struct pvc_device *pvc) { … } static inline void delete_unused_pvcs(hdlc_device *hdlc) { … } static inline struct net_device **get_dev_p(struct pvc_device *pvc, int type) { … } static int fr_hard_header(struct sk_buff *skb, u16 dlci) { … } static int pvc_open(struct net_device *dev) { … } static int pvc_close(struct net_device *dev) { … } static int pvc_ioctl(struct net_device *dev, struct if_settings *ifs) { … } static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev) { … } static inline void fr_log_dlci_active(struct pvc_device *pvc) { … } static inline u8 fr_lmi_nextseq(u8 x) { … } static void fr_lmi_send(struct net_device *dev, int fullrep) { … } static void fr_set_link_state(int reliable, struct net_device *dev) { … } static void fr_timer(struct timer_list *t) { … } static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb) { … } static int fr_snap_parse(struct sk_buff *skb, struct pvc_device *pvc) { … } static int fr_rx(struct sk_buff *skb) { … } static void fr_start(struct net_device *dev) { … } static void fr_stop(struct net_device *dev) { … } static void fr_close(struct net_device *dev) { … } static void pvc_setup(struct net_device *dev) { … } static const struct net_device_ops pvc_ops = …; static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type) { … } static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type) { … } static void fr_destroy(struct net_device *frad) { … } static struct hdlc_proto proto = …; static int fr_ioctl(struct net_device *dev, struct if_settings *ifs) { … } static int __init hdlc_fr_init(void) { … } static void __exit hdlc_fr_exit(void) { … } module_init(…) …; module_exit(hdlc_fr_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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