// SPDX-License-Identifier: GPL-2.0-only /* * Ethernet netdevice using ATM AAL5 as underlying carrier * (RFC1483 obsoleted by RFC2684) for Linux * * Authors: Marcell GAL, 2000, XDSL Ltd, Hungary * Eric Kinzie, 2006-2007, US Naval Research Laboratory */ #define pr_fmt(fmt) … #include <linux/module.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/netdevice.h> #include <linux/skbuff.h> #include <linux/etherdevice.h> #include <linux/rtnetlink.h> #include <linux/ip.h> #include <linux/uaccess.h> #include <linux/slab.h> #include <net/arp.h> #include <linux/atm.h> #include <linux/atmdev.h> #include <linux/capability.h> #include <linux/seq_file.h> #include <linux/atmbr2684.h> #include "common.h" static void skb_debug(const struct sk_buff *skb) { … } #define BR2684_ETHERTYPE_LEN … #define BR2684_PAD_LEN … #define LLC … #define SNAP_BRIDGED … #define SNAP_ROUTED … #define PID_ETHERNET … #define ETHERTYPE_IPV4 … #define ETHERTYPE_IPV6 … #define PAD_BRIDGED … static const unsigned char ethertype_ipv4[] = …; static const unsigned char ethertype_ipv6[] = …; static const unsigned char llc_oui_pid_pad[] = …; static const unsigned char pad[] = …; static const unsigned char llc_oui_ipv4[] = …; static const unsigned char llc_oui_ipv6[] = …; enum br2684_encaps { … }; struct br2684_vcc { … }; struct br2684_dev { … }; /* * This lock should be held for writing any time the list of devices or * their attached vcc's could be altered. It should be held for reading * any time these are being queried. Note that we sometimes need to * do read-locking under interrupting context, so write locking must block * the current CPU's interrupts. */ static DEFINE_RWLOCK(devs_lock); static LIST_HEAD(br2684_devs); static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) { … } static inline struct net_device *list_entry_brdev(const struct list_head *le) { … } static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) { … } static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) { … } /* Caller should hold read_lock(&devs_lock) */ static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) { … } static int atm_dev_event(struct notifier_block *this, unsigned long event, void *arg) { … } static struct notifier_block atm_dev_notifier = …; /* chained vcc->pop function. Check if we should wake the netif_queue */ static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb) { … } /* * Send a packet out a particular vcc. Not to useful right now, but paves * the way for multiple vcc's per itf. Returns true if we can send, * otherwise false */ static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev, struct br2684_vcc *brvcc) { … } static void br2684_release_cb(struct atm_vcc *atmvcc) { … } static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb, const struct br2684_dev *brdev) { … } static netdev_tx_t br2684_start_xmit(struct sk_buff *skb, struct net_device *dev) { … } /* * We remember when the MAC gets set, so we don't override it later with * the ESI of the ATM card of the first VC */ static int br2684_mac_addr(struct net_device *dev, void *p) { … } #ifdef CONFIG_ATM_BR2684_IPFILTER /* this IOCTL is experimental. */ static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) { … } /* Returns 1 if packet should be dropped */ static inline int packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) { … } #endif /* CONFIG_ATM_BR2684_IPFILTER */ static void br2684_close_vcc(struct br2684_vcc *brvcc) { … } /* when AAL5 PDU comes in: */ static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) { … } /* * Assign a vcc to a dev * Note: we do not have explicit unassign, but look at _push() */ static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) { … } static const struct net_device_ops br2684_netdev_ops = …; static const struct net_device_ops br2684_netdev_ops_routed = …; static void br2684_setup(struct net_device *netdev) { … } static void br2684_setup_routed(struct net_device *netdev) { … } static int br2684_create(void __user *arg) { … } /* * This handles ioctls actually performed on our vcc - we must return * -ENOIOCTLCMD for any unrecognized ioctl */ static int br2684_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) { … } static struct atm_ioctl br2684_ioctl_ops = …; #ifdef CONFIG_PROC_FS static void *br2684_seq_start(struct seq_file *seq, loff_t * pos) __acquires(devs_lock) { … } static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos) { … } static void br2684_seq_stop(struct seq_file *seq, void *v) __releases(devs_lock) { … } static int br2684_seq_show(struct seq_file *seq, void *v) { … } static const struct seq_operations br2684_seq_ops = …; extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ #endif /* CONFIG_PROC_FS */ static int __init br2684_init(void) { … } static void __exit br2684_exit(void) { … } module_init(…) …; module_exit(br2684_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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