Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Generic HDLC support routines for Linux
 * Frame Relay support
 *
 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
 *
 
            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			0x03
#define FR_PAD			0x00
 
#define NLPID_IP		0xCC
#define NLPID_IPV6		0x8E
#define NLPID_SNAP		0x80
#define NLPID_PAD		0x00
#define NLPID_CCITT_ANSI_LMI	0x08
#define NLPID_CISCO_LMI		0x09
 
 
#define LMI_CCITT_ANSI_DLCI	   0 /* LMI DLCI */
#define LMI_CISCO_DLCI		1023
 
#define LMI_CALLREF		0x00 /* Call Reference */
#define LMI_ANSI_LOCKSHIFT	0x95 /* ANSI locking shift */
#define LMI_ANSI_CISCO_REPTYPE	0x01 /* report type */
#define LMI_CCITT_REPTYPE	0x51
#define LMI_ANSI_CISCO_ALIVE	0x03 /* keep alive */
#define LMI_CCITT_ALIVE		0x53
#define LMI_ANSI_CISCO_PVCSTAT	0x07 /* PVC status */
#define LMI_CCITT_PVCSTAT	0x57
 
#define LMI_FULLREP		0x00 /* full report  */
#define LMI_INTEGRITY		0x01 /* link integrity report */
#define LMI_SINGLE		0x02 /* single PVC report */
 
#define LMI_STATUS_ENQUIRY      0x75
#define LMI_STATUS              0x7D /* reply */
 
#define LMI_REPT_LEN               1 /* report type element length */
#define LMI_INTEG_LEN              2 /* link integrity element length */
 
#define LMI_CCITT_CISCO_LENGTH	  13 /* LMI frame lengths */
#define LMI_ANSI_LENGTH		  14
 
 
struct fr_hdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
<------>unsigned ea1:	1;
<------>unsigned cr:	1;
<------>unsigned dlcih:	6;
 
<------>unsigned ea2:	1;
<------>unsigned de:	1;
<------>unsigned becn:	1;
<------>unsigned fecn:	1;
<------>unsigned dlcil:	4;
#else
<------>unsigned dlcih:	6;
<------>unsigned cr:	1;
<------>unsigned ea1:	1;
 
<------>unsigned dlcil:	4;
<------>unsigned fecn:	1;
<------>unsigned becn:	1;
<------>unsigned de:	1;
<------>unsigned ea2:	1;
#endif
} __packed;
 
 
struct pvc_device {
<------>struct net_device *frad;
<------>struct net_device *main;
<------>struct net_device *ether;	/* bridged Ethernet interface	*/
<------>struct pvc_device *next;	/* Sorted in ascending DLCI order */
<------>int dlci;
<------>int open_count;
 
<------>struct {
<------><------>unsigned int new: 1;
<------><------>unsigned int active: 1;
<------><------>unsigned int exist: 1;
<------><------>unsigned int deleted: 1;
<------><------>unsigned int fecn: 1;
<------><------>unsigned int becn: 1;
<------><------>unsigned int bandwidth;	/* Cisco LMI reporting only */
<------>}state;
};
 
struct frad_state {
<------>fr_proto settings;
<------>struct pvc_device *first_pvc;
<------>int dce_pvc_count;
 
<------>struct timer_list timer;
<------>struct net_device *dev;
<------>unsigned long last_poll;
<------>int reliable;
<------>int dce_changed;
<------>int request;
<------>int fullrep_sent;
<------>u32 last_errors; /* last errors bit list */
<------>u8 n391cnt;
<------>u8 txseq; /* TX sequence number */
<------>u8 rxseq; /* RX sequence number */
};
 
 
static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
 
 
static inline u16 q922_to_dlci(u8 *hdr)
{
<------>return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
}
 
 
static inline void dlci_to_q922(u8 *hdr, u16 dlci)
{
<------>hdr[0] = (dlci >> 2) & 0xFC;
<------>hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
}
 
 
static inline struct frad_state* state(hdlc_device *hdlc)
{
<------>return(struct frad_state *)(hdlc->state);
}
 
 
static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
{
<------>struct pvc_device *pvc = state(hdlc)->first_pvc;
 
<------>while (pvc) {
<------><------>if (pvc->dlci == dlci)
<------><------><------>return pvc;
<------><------>if (pvc->dlci > dlci)
<------><------><------>return NULL; /* the list is sorted */
<------><------>pvc = pvc->next;
<------>}
 
<------>return NULL;
}
 
 
static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
{
<------>hdlc_device *hdlc = dev_to_hdlc(dev);
<------>struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
 
<------>while (*pvc_p) {
<------><------>if ((*pvc_p)->dlci == dlci)
<------><------><------>return *pvc_p;
<------><------>if ((*pvc_p)->dlci > dlci)
<------><------><------>break;	/* the list is sorted */
<------><------>pvc_p = &(*pvc_p)->next;
<------>}
 
<------>pvc = kzalloc(sizeof(*pvc), GFP_ATOMIC);
#ifdef DEBUG_PVC
<------>printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
#endif
<------>if (!pvc)
<------><------>return NULL;
 
<------>pvc->dlci = dlci;
<------>pvc->frad = dev;
<------>pvc->next = *pvc_p;	/* Put it in the chain */
<------>*pvc_p = pvc;
<------>return pvc;
}
 
 
static inline int pvc_is_used(struct pvc_device *pvc)
{
<------>return pvc->main || pvc->ether;
}
 
 
static inline void pvc_carrier(int on, struct pvc_device *pvc)
{
<------>if (on) {
<------><------>if (pvc->main)
<------><------><------>if (!netif_carrier_ok(pvc->main))
<------><------><------><------>netif_carrier_on(pvc->main);
<------><------>if (pvc->ether)
<------><------><------>if (!netif_carrier_ok(pvc->ether))
<------><------><------><------>netif_carrier_on(pvc->ether);
<------>} else {
<------><------>if (pvc->main)
<------><------><------>if (netif_carrier_ok(pvc->main))
<------><------><------><------>netif_carrier_off(pvc->main);
<------><------>if (pvc->ether)
<------><------><------>if (netif_carrier_ok(pvc->ether))
<------><------><------><------>netif_carrier_off(pvc->ether);
<------>}
}
 
 
static inline void delete_unused_pvcs(hdlc_device *hdlc)
{
<------>struct pvc_device **pvc_p = &state(hdlc)->first_pvc;
 
<------>while (*pvc_p) {
<------><------>if (!pvc_is_used(*pvc_p)) {
<------><------><------>struct pvc_device *pvc = *pvc_p;
#ifdef DEBUG_PVC
<------><------><------>printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
#endif
<------><------><------>*pvc_p = pvc->next;
<------><------><------>kfree(pvc);
<------><------><------>continue;
<------><------>}
<------><------>pvc_p = &(*pvc_p)->next;
<------>}
}
 
 
static inline struct net_device **get_dev_p(struct pvc_device *pvc,
<------><------><------><------><------>    int type)
{
<------>if (type == ARPHRD_ETHER)
<------><------>return &pvc->ether;
<------>else
<------><------>return &pvc->main;
}
 
 
static int fr_hard_header(struct sk_buff *skb, u16 dlci)
{
<------>if (!skb->dev) { /* Control packets */
<------><------>switch (dlci) {
<------><------>case LMI_CCITT_ANSI_DLCI:
<------><------><------>skb_push(skb, 4);
<------><------><------>skb->data[3] = NLPID_CCITT_ANSI_LMI;
<------><------><------>break;
 
<------><------>case LMI_CISCO_DLCI:
<------><------><------>skb_push(skb, 4);
<------><------><------>skb->data[3] = NLPID_CISCO_LMI;
<------><------><------>break;
 
<------><------>default:
<------><------><------>return -EINVAL;
<------><------>}
 
<------>} else if (skb->dev->type == ARPHRD_DLCI) {
<------><------>switch (skb->protocol) {
<------><------>case htons(ETH_P_IP):
<------><------><------>skb_push(skb, 4);
<------><------><------>skb->data[3] = NLPID_IP;
<------><------><------>break;
 
<------><------>case htons(ETH_P_IPV6):
<------><------><------>skb_push(skb, 4);
<------><------><------>skb->data[3] = NLPID_IPV6;
<------><------><------>break;
 
<------><------>default:
<------><------><------>skb_push(skb, 10);
<------><------><------>skb->data[3] = FR_PAD;
<------><------><------>skb->data[4] = NLPID_SNAP;
<------><------><------>/* OUI 00-00-00 indicates an Ethertype follows */
<------><------><------>skb->data[5] = 0x00;
<------><------><------>skb->data[6] = 0x00;
<------><------><------>skb->data[7] = 0x00;
<------><------><------>/* This should be an Ethertype: */
<------><------><------>*(__be16 *)(skb->data + 8) = skb->protocol;
<------><------>}
 
<------>} else if (skb->dev->type == ARPHRD_ETHER) {
<------><------>skb_push(skb, 10);
<------><------>skb->data[3] = FR_PAD;
<------><------>skb->data[4] = NLPID_SNAP;
<------><------>/* OUI 00-80-C2 stands for the 802.1 organization */
<------><------>skb->data[5] = 0x00;
<------><------>skb->data[6] = 0x80;
<------><------>skb->data[7] = 0xC2;
<------><------>/* PID 00-07 stands for Ethernet frames without FCS */
<------><------>skb->data[8] = 0x00;
<------><------>skb->data[9] = 0x07;
 
<------>} else {
<------><------>return -EINVAL;
<------>}
 
<------>dlci_to_q922(skb->data, dlci);
<------>skb->data[2] = FR_UI;
<------>return 0;
}
 
 
 
static int pvc_open(struct net_device *dev)
{
<------>struct pvc_device *pvc = dev->ml_priv;
 
<------>if ((pvc->frad->flags & IFF_UP) == 0)
<------><------>return -EIO;  /* Frad must be UP in order to activate PVC */
 
<------>if (pvc->open_count++ == 0) {
<------><------>hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
<------><------>if (state(hdlc)->settings.lmi == LMI_NONE)
<------><------><------>pvc->state.active = netif_carrier_ok(pvc->frad);
 
<------><------>pvc_carrier(pvc->state.active, pvc);
<------><------>state(hdlc)->dce_changed = 1;
<------>}
<------>return 0;
}
 
 
 
static int pvc_close(struct net_device *dev)
{
<------>struct pvc_device *pvc = dev->ml_priv;
 
<------>if (--pvc->open_count == 0) {
<------><------>hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
<------><------>if (state(hdlc)->settings.lmi == LMI_NONE)
<------><------><------>pvc->state.active = 0;
 
<------><------>if (state(hdlc)->settings.dce) {
<------><------><------>state(hdlc)->dce_changed = 1;
<------><------><------>pvc->state.active = 0;
<------><------>}
<------>}
<------>return 0;
}
 
 
 
static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
<------>struct pvc_device *pvc = dev->ml_priv;
<------>fr_proto_pvc_info info;
 
<------>if (ifr->ifr_settings.type == IF_GET_PROTO) {
<------><------>if (dev->type == ARPHRD_ETHER)
<------><------><------>ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
<------><------>else
<------><------><------>ifr->ifr_settings.type = IF_PROTO_FR_PVC;
 
<------><------>if (ifr->ifr_settings.size < sizeof(info)) {
<------><------><------>/* data size wanted */
<------><------><------>ifr->ifr_settings.size = sizeof(info);
<------><------><------>return -ENOBUFS;
<------><------>}
 
<------><------>info.dlci = pvc->dlci;
<------><------>memcpy(info.master, pvc->frad->name, IFNAMSIZ);
<------><------>if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
<------><------><------><------> &info, sizeof(info)))
<------><------><------>return -EFAULT;
<------><------>return 0;
<------>}
 
<------>return -EINVAL;
}
 
static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
{
<------>struct pvc_device *pvc = dev->ml_priv;
 
<------>if (!pvc->state.active)
<------><------>goto drop;
 
<------>if (dev->type == ARPHRD_ETHER) {
<------><------>int pad = ETH_ZLEN - skb->len;
 
<------><------>if (pad > 0) { /* Pad the frame with zeros */
<------><------><------>if (__skb_pad(skb, pad, false))
<------><------><------><------>goto drop;
<------><------><------>skb_put(skb, pad);
<------><------>}
<------>}
 
<------>/* We already requested the header space with dev->needed_headroom.
<------> * So this is just a protection in case the upper layer didn't take
<------> * dev->needed_headroom into consideration.
<------> */
<------>if (skb_headroom(skb) < 10) {
<------><------>struct sk_buff *skb2 = skb_realloc_headroom(skb, 10);
 
<------><------>if (!skb2)
<------><------><------>goto drop;
<------><------>dev_kfree_skb(skb);
<------><------>skb = skb2;
<------>}
 
<------>skb->dev = dev;
<------>if (fr_hard_header(skb, pvc->dlci))
<------><------>goto drop;
 
<------>dev->stats.tx_bytes += skb->len;
<------>dev->stats.tx_packets++;
<------>if (pvc->state.fecn) /* TX Congestion counter */
<------><------>dev->stats.tx_compressed++;
<------>skb->dev = pvc->frad;
<------>skb->protocol = htons(ETH_P_HDLC);
<------>skb_reset_network_header(skb);
<------>dev_queue_xmit(skb);
<------>return NETDEV_TX_OK;
 
drop:
<------>dev->stats.tx_dropped++;
<------>kfree_skb(skb);
<------>return NETDEV_TX_OK;
}
 
static inline void fr_log_dlci_active(struct pvc_device *pvc)
{
<------>netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",
<------><------>    pvc->dlci,
<------><------>    pvc->main ? pvc->main->name : "",
<------><------>    pvc->main && pvc->ether ? " " : "",
<------><------>    pvc->ether ? pvc->ether->name : "",
<------><------>    pvc->state.new ? " new" : "",
<------><------>    !pvc->state.exist ? "deleted" :
<------><------>    pvc->state.active ? "active" : "inactive");
}
 
 
 
static inline u8 fr_lmi_nextseq(u8 x)
{
<------>x++;
<------>return x ? x : 1;
}
 
 
static void fr_lmi_send(struct net_device *dev, int fullrep)
{
<------>hdlc_device *hdlc = dev_to_hdlc(dev);
<------>struct sk_buff *skb;
<------>struct pvc_device *pvc = state(hdlc)->first_pvc;
<------>int lmi = state(hdlc)->settings.lmi;
<------>int dce = state(hdlc)->settings.dce;
<------>int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
<------>int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
<------>u8 *data;
<------>int i = 0;
 
<------>if (dce && fullrep) {
<------><------>len += state(hdlc)->dce_pvc_count * (2 + stat_len);
<------><------>if (len > HDLC_MAX_MRU) {
<------><------><------>netdev_warn(dev, "Too many PVCs while sending LMI full report\n");
<------><------><------>return;
<------><------>}
<------>}
 
<------>skb = dev_alloc_skb(len);
<------>if (!skb) {
<------><------>netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n");
<------><------>return;
<------>}
<------>memset(skb->data, 0, len);
<------>skb_reserve(skb, 4);
<------>if (lmi == LMI_CISCO) {
<------><------>fr_hard_header(skb, LMI_CISCO_DLCI);
<------>} else {
<------><------>fr_hard_header(skb, LMI_CCITT_ANSI_DLCI);
<------>}
<------>data = skb_tail_pointer(skb);
<------>data[i++] = LMI_CALLREF;
<------>data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
<------>if (lmi == LMI_ANSI)
<------><------>data[i++] = LMI_ANSI_LOCKSHIFT;
<------>data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
<------><------>LMI_ANSI_CISCO_REPTYPE;
<------>data[i++] = LMI_REPT_LEN;
<------>data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
<------>data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
<------>data[i++] = LMI_INTEG_LEN;
<------>data[i++] = state(hdlc)->txseq =
<------><------>fr_lmi_nextseq(state(hdlc)->txseq);
<------>data[i++] = state(hdlc)->rxseq;
 
<------>if (dce && fullrep) {
<------><------>while (pvc) {
<------><------><------>data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
<------><------><------><------>LMI_ANSI_CISCO_PVCSTAT;
<------><------><------>data[i++] = stat_len;
 
<------><------><------>/* LMI start/restart */
<------><------><------>if (state(hdlc)->reliable && !pvc->state.exist) {
<------><------><------><------>pvc->state.exist = pvc->state.new = 1;
<------><------><------><------>fr_log_dlci_active(pvc);
<------><------><------>}
 
<------><------><------>/* ifconfig PVC up */
<------><------><------>if (pvc->open_count && !pvc->state.active &&
<------><------><------>    pvc->state.exist && !pvc->state.new) {
<------><------><------><------>pvc_carrier(1, pvc);
<------><------><------><------>pvc->state.active = 1;
<------><------><------><------>fr_log_dlci_active(pvc);
<------><------><------>}
 
<------><------><------>if (lmi == LMI_CISCO) {
<------><------><------><------>data[i] = pvc->dlci >> 8;
<------><------><------><------>data[i + 1] = pvc->dlci & 0xFF;
<------><------><------>} else {
<------><------><------><------>data[i] = (pvc->dlci >> 4) & 0x3F;
<------><------><------><------>data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
<------><------><------><------>data[i + 2] = 0x80;
<------><------><------>}
 
<------><------><------>if (pvc->state.new)
<------><------><------><------>data[i + 2] |= 0x08;
<------><------><------>else if (pvc->state.active)
<------><------><------><------>data[i + 2] |= 0x02;
 
<------><------><------>i += stat_len;
<------><------><------>pvc = pvc->next;
<------><------>}
<------>}
 
<------>skb_put(skb, i);
<------>skb->priority = TC_PRIO_CONTROL;
<------>skb->dev = dev;
<------>skb->protocol = htons(ETH_P_HDLC);
<------>skb_reset_network_header(skb);
 
<------>dev_queue_xmit(skb);
}
 
 
 
static void fr_set_link_state(int reliable, struct net_device *dev)
{
<------>hdlc_device *hdlc = dev_to_hdlc(dev);
<------>struct pvc_device *pvc = state(hdlc)->first_pvc;
 
<------>state(hdlc)->reliable = reliable;
<------>if (reliable) {
<------><------>netif_dormant_off(dev);
<------><------>state(hdlc)->n391cnt = 0; /* Request full status */
<------><------>state(hdlc)->dce_changed = 1;
 
<------><------>if (state(hdlc)->settings.lmi == LMI_NONE) {
<------><------><------>while (pvc) {	/* Activate all PVCs */
<------><------><------><------>pvc_carrier(1, pvc);
<------><------><------><------>pvc->state.exist = pvc->state.active = 1;
<------><------><------><------>pvc->state.new = 0;
<------><------><------><------>pvc = pvc->next;
<------><------><------>}
<------><------>}
<------>} else {
<------><------>netif_dormant_on(dev);
<------><------>while (pvc) {		/* Deactivate all PVCs */
<------><------><------>pvc_carrier(0, pvc);
<------><------><------>pvc->state.exist = pvc->state.active = 0;
<------><------><------>pvc->state.new = 0;
<------><------><------>if (!state(hdlc)->settings.dce)
<------><------><------><------>pvc->state.bandwidth = 0;
<------><------><------>pvc = pvc->next;
<------><------>}
<------>}
}
 
 
static void fr_timer(struct timer_list *t)
{
<------>struct frad_state *st = from_timer(st, t, timer);
<------>struct net_device *dev = st->dev;
<------>hdlc_device *hdlc = dev_to_hdlc(dev);
<------>int i, cnt = 0, reliable;
<------>u32 list;
 
<------>if (state(hdlc)->settings.dce) {
<------><------>reliable = state(hdlc)->request &&
<------><------><------>time_before(jiffies, state(hdlc)->last_poll +
<------><------><------><------>    state(hdlc)->settings.t392 * HZ);
<------><------>state(hdlc)->request = 0;
<------>} else {
<------><------>state(hdlc)->last_errors <<= 1; /* Shift the list */
<------><------>if (state(hdlc)->request) {
<------><------><------>if (state(hdlc)->reliable)
<------><------><------><------>netdev_info(dev, "No LMI status reply received\n");
<------><------><------>state(hdlc)->last_errors |= 1;
<------><------>}
 
<------><------>list = state(hdlc)->last_errors;
<------><------>for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
<------><------><------>cnt += (list & 1);	/* errors count */
 
<------><------>reliable = (cnt < state(hdlc)->settings.n392);
<------>}
 
<------>if (state(hdlc)->reliable != reliable) {
<------><------>netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un");
<------><------>fr_set_link_state(reliable, dev);
<------>}
 
<------>if (state(hdlc)->settings.dce)
<------><------>state(hdlc)->timer.expires = jiffies +
<------><------><------>state(hdlc)->settings.t392 * HZ;
<------>else {
<------><------>if (state(hdlc)->n391cnt)
<------><------><------>state(hdlc)->n391cnt--;
 
<------><------>fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
 
<------><------>state(hdlc)->last_poll = jiffies;
<------><------>state(hdlc)->request = 1;
<------><------>state(hdlc)->timer.expires = jiffies +
<------><------><------>state(hdlc)->settings.t391 * HZ;
<------>}
 
<------>add_timer(&state(hdlc)->timer);
}
 
 
static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
{
<------>hdlc_device *hdlc = dev_to_hdlc(dev);
<------>struct pvc_device *pvc;
<------>u8 rxseq, txseq;
<------>int lmi = state(hdlc)->settings.lmi;
<------>int dce = state(hdlc)->settings.dce;
<------>int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
 
<------>if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
<------><------><------>LMI_CCITT_CISCO_LENGTH)) {
<------><------>netdev_info(dev, "Short LMI frame\n");
<------><------>return 1;
<------>}
 
<------>if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
<------><------><------>     NLPID_CCITT_ANSI_LMI)) {
<------><------>netdev_info(dev, "Received non-LMI frame with LMI DLCI\n");
<------><------>return 1;
<------>}
 
<------>if (skb->data[4] != LMI_CALLREF) {
<------><------>netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n",
<------><------><------>    skb->data[4]);
<------><------>return 1;
<------>}
 
<------>if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
<------><------>netdev_info(dev, "Invalid LMI Message type (0x%02X)\n",
<------><------><------>    skb->data[5]);
<------><------>return 1;
<------>}
 
<------>if (lmi == LMI_ANSI) {
<------><------>if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
<------><------><------>netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n",
<------><------><------><------>    skb->data[6]);
<------><------><------>return 1;
<------><------>}
<------><------>i = 7;
<------>} else
<------><------>i = 6;
 
<------>if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
<------><------><------>     LMI_ANSI_CISCO_REPTYPE)) {
<------><------>netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n",
<------><------><------>    skb->data[i]);
<------><------>return 1;
<------>}
 
<------>if (skb->data[++i] != LMI_REPT_LEN) {
<------><------>netdev_info(dev, "Invalid LMI Report type IE length (%u)\n",
<------><------><------>    skb->data[i]);
<------><------>return 1;
<------>}
 
<------>reptype = skb->data[++i];
<------>if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
<------><------>netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n",
<------><------><------>    reptype);
<------><------>return 1;
<------>}
 
<------>if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
<------><------><------>       LMI_ANSI_CISCO_ALIVE)) {
<------><------>netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n",
<------><------><------>    skb->data[i]);
<------><------>return 1;
<------>}
 
<------>if (skb->data[++i] != LMI_INTEG_LEN) {
<------><------>netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n",
<------><------><------>    skb->data[i]);
<------><------>return 1;
<------>}
<------>i++;
 
<------>state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
<------>rxseq = skb->data[i++];	/* Should confirm our sequence */
 
<------>txseq = state(hdlc)->txseq;
 
<------>if (dce)
<------><------>state(hdlc)->last_poll = jiffies;
 
<------>error = 0;
<------>if (!state(hdlc)->reliable)
<------><------>error = 1;
 
<------>if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
<------><------>state(hdlc)->n391cnt = 0;
<------><------>error = 1;
<------>}
 
<------>if (dce) {
<------><------>if (state(hdlc)->fullrep_sent && !error) {
/* Stop sending full report - the last one has been confirmed by DTE */
<------><------><------>state(hdlc)->fullrep_sent = 0;
<------><------><------>pvc = state(hdlc)->first_pvc;
<------><------><------>while (pvc) {
<------><------><------><------>if (pvc->state.new) {
<------><------><------><------><------>pvc->state.new = 0;
 
/* Tell DTE that new PVC is now active */
<------><------><------><------><------>state(hdlc)->dce_changed = 1;
<------><------><------><------>}
<------><------><------><------>pvc = pvc->next;
<------><------><------>}
<------><------>}
 
<------><------>if (state(hdlc)->dce_changed) {
<------><------><------>reptype = LMI_FULLREP;
<------><------><------>state(hdlc)->fullrep_sent = 1;
<------><------><------>state(hdlc)->dce_changed = 0;
<------><------>}
 
<------><------>state(hdlc)->request = 1; /* got request */
<------><------>fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
<------><------>return 0;
<------>}
 
<------>/* DTE */
 
<------>state(hdlc)->request = 0; /* got response, no request pending */
 
<------>if (error)
<------><------>return 0;
 
<------>if (reptype != LMI_FULLREP)
<------><------>return 0;
 
<------>pvc = state(hdlc)->first_pvc;
 
<------>while (pvc) {
<------><------>pvc->state.deleted = 1;
<------><------>pvc = pvc->next;
<------>}
 
<------>no_ram = 0;
<------>while (skb->len >= i + 2 + stat_len) {
<------><------>u16 dlci;
<------><------>u32 bw;
<------><------>unsigned int active, new;
 
<------><------>if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
<------><------><------><------>       LMI_ANSI_CISCO_PVCSTAT)) {
<------><------><------>netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n",
<------><------><------><------>    skb->data[i]);
<------><------><------>return 1;
<------><------>}
 
<------><------>if (skb->data[++i] != stat_len) {
<------><------><------>netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n",
<------><------><------><------>    skb->data[i]);
<------><------><------>return 1;
<------><------>}
<------><------>i++;
 
<------><------>new = !! (skb->data[i + 2] & 0x08);
<------><------>active = !! (skb->data[i + 2] & 0x02);
<------><------>if (lmi == LMI_CISCO) {
<------><------><------>dlci = (skb->data[i] << 8) | skb->data[i + 1];
<------><------><------>bw = (skb->data[i + 3] << 16) |
<------><------><------><------>(skb->data[i + 4] << 8) |
<------><------><------><------>(skb->data[i + 5]);
<------><------>} else {
<------><------><------>dlci = ((skb->data[i] & 0x3F) << 4) |
<------><------><------><------>((skb->data[i + 1] & 0x78) >> 3);
<------><------><------>bw = 0;
<------><------>}
 
<------><------>pvc = add_pvc(dev, dlci);
 
<------><------>if (!pvc && !no_ram) {
<------><------><------>netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n");
<------><------><------>no_ram = 1;
<------><------>}
 
<------><------>if (pvc) {
<------><------><------>pvc->state.exist = 1;
<------><------><------>pvc->state.deleted = 0;
<------><------><------>if (active != pvc->state.active ||
<------><------><------>    new != pvc->state.new ||
<------><------><------>    bw != pvc->state.bandwidth ||
<------><------><------>    !pvc->state.exist) {
<------><------><------><------>pvc->state.new = new;
<------><------><------><------>pvc->state.active = active;
<------><------><------><------>pvc->state.bandwidth = bw;
<------><------><------><------>pvc_carrier(active, pvc);
<------><------><------><------>fr_log_dlci_active(pvc);
<------><------><------>}
<------><------>}
 
<------><------>i += stat_len;
<------>}
 
<------>pvc = state(hdlc)->first_pvc;
 
<------>while (pvc) {
<------><------>if (pvc->state.deleted && pvc->state.exist) {
<------><------><------>pvc_carrier(0, pvc);
<------><------><------>pvc->state.active = pvc->state.new = 0;
<------><------><------>pvc->state.exist = 0;
<------><------><------>pvc->state.bandwidth = 0;
<------><------><------>fr_log_dlci_active(pvc);
<------><------>}
<------><------>pvc = pvc->next;
<------>}
 
<------>/* Next full report after N391 polls */
<------>state(hdlc)->n391cnt = state(hdlc)->settings.n391;
 
<------>return 0;
}
 
 
static int fr_rx(struct sk_buff *skb)
{
<------>struct net_device *frad = skb->dev;
<------>hdlc_device *hdlc = dev_to_hdlc(frad);
<------>struct fr_hdr *fh = (struct fr_hdr *)skb->data;
<------>u8 *data = skb->data;
<------>u16 dlci;
<------>struct pvc_device *pvc;
<------>struct net_device *dev = NULL;
 
<------>if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
<------><------>goto rx_error;
 
<------>dlci = q922_to_dlci(skb->data);
 
<------>if ((dlci == LMI_CCITT_ANSI_DLCI &&
<------>     (state(hdlc)->settings.lmi == LMI_ANSI ||
<------>      state(hdlc)->settings.lmi == LMI_CCITT)) ||
<------>    (dlci == LMI_CISCO_DLCI &&
<------>     state(hdlc)->settings.lmi == LMI_CISCO)) {
<------><------>if (fr_lmi_recv(frad, skb))
<------><------><------>goto rx_error;
<------><------>dev_kfree_skb_any(skb);
<------><------>return NET_RX_SUCCESS;
<------>}
 
<------>pvc = find_pvc(hdlc, dlci);
<------>if (!pvc) {
#ifdef DEBUG_PKT
<------><------>netdev_info(frad, "No PVC for received frame's DLCI %d\n",
<------><------><------>    dlci);
#endif
<------><------>dev_kfree_skb_any(skb);
<------><------>return NET_RX_DROP;
<------>}
 
<------>if (pvc->state.fecn != fh->fecn) {
#ifdef DEBUG_ECN
<------><------>printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
<------><------>       dlci, fh->fecn ? "N" : "FF");
#endif
<------><------>pvc->state.fecn ^= 1;
<------>}
 
<------>if (pvc->state.becn != fh->becn) {
#ifdef DEBUG_ECN
<------><------>printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
<------><------>       dlci, fh->becn ? "N" : "FF");
#endif
<------><------>pvc->state.becn ^= 1;
<------>}
 
 
<------>if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
<------><------>frad->stats.rx_dropped++;
<------><------>return NET_RX_DROP;
<------>}
 
<------>if (data[3] == NLPID_IP) {
<------><------>skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
<------><------>dev = pvc->main;
<------><------>skb->protocol = htons(ETH_P_IP);
 
<------>} else if (data[3] == NLPID_IPV6) {
<------><------>skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
<------><------>dev = pvc->main;
<------><------>skb->protocol = htons(ETH_P_IPV6);
 
<------>} else if (skb->len > 10 && data[3] == FR_PAD &&
<------><------>   data[4] == NLPID_SNAP && data[5] == FR_PAD) {
<------><------>u16 oui = ntohs(*(__be16*)(data + 6));
<------><------>u16 pid = ntohs(*(__be16*)(data + 8));
<------><------>skb_pull(skb, 10);
 
<------><------>switch ((((u32)oui) << 16) | pid) {
<------><------>case ETH_P_ARP: /* routed frame with SNAP */
<------><------>case ETH_P_IPX:
<------><------>case ETH_P_IP:	/* a long variant */
<------><------>case ETH_P_IPV6:
<------><------><------>dev = pvc->main;
<------><------><------>skb->protocol = htons(pid);
<------><------><------>break;
 
<------><------>case 0x80C20007: /* bridged Ethernet frame */
<------><------><------>if ((dev = pvc->ether) != NULL)
<------><------><------><------>skb->protocol = eth_type_trans(skb, dev);
<------><------><------>break;
 
<------><------>default:
<------><------><------>netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n",
<------><------><------><------>    oui, pid);
<------><------><------>dev_kfree_skb_any(skb);
<------><------><------>return NET_RX_DROP;
<------><------>}
<------>} else {
<------><------>netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",
<------><------><------>    data[3], skb->len);
<------><------>dev_kfree_skb_any(skb);
<------><------>return NET_RX_DROP;
<------>}
 
<------>if (dev) {
<------><------>dev->stats.rx_packets++; /* PVC traffic */
<------><------>dev->stats.rx_bytes += skb->len;
<------><------>if (pvc->state.becn)
<------><------><------>dev->stats.rx_compressed++;
<------><------>skb->dev = dev;
<------><------>netif_rx(skb);
<------><------>return NET_RX_SUCCESS;
<------>} else {
<------><------>dev_kfree_skb_any(skb);
<------><------>return NET_RX_DROP;
<------>}
 
 rx_error:
<------>frad->stats.rx_errors++; /* Mark error */
<------>dev_kfree_skb_any(skb);
<------>return NET_RX_DROP;
}
 
 
 
static void fr_start(struct net_device *dev)
{
<------>hdlc_device *hdlc = dev_to_hdlc(dev);
#ifdef DEBUG_LINK
<------>printk(KERN_DEBUG "fr_start\n");
#endif
<------>if (state(hdlc)->settings.lmi != LMI_NONE) {
<------><------>state(hdlc)->reliable = 0;
<------><------>state(hdlc)->dce_changed = 1;
<------><------>state(hdlc)->request = 0;
<------><------>state(hdlc)->fullrep_sent = 0;
<------><------>state(hdlc)->last_errors = 0xFFFFFFFF;
<------><------>state(hdlc)->n391cnt = 0;
<------><------>state(hdlc)->txseq = state(hdlc)->rxseq = 0;
 
<------><------>state(hdlc)->dev = dev;
<------><------>timer_setup(&state(hdlc)->timer, fr_timer, 0);
<------><------>/* First poll after 1 s */
<------><------>state(hdlc)->timer.expires = jiffies + HZ;
<------><------>add_timer(&state(hdlc)->timer);
<------>} else
<------><------>fr_set_link_state(1, dev);
}
 
 
static void fr_stop(struct net_device *dev)
{
<------>hdlc_device *hdlc = dev_to_hdlc(dev);
#ifdef DEBUG_LINK
<------>printk(KERN_DEBUG "fr_stop\n");
#endif
<------>if (state(hdlc)->settings.lmi != LMI_NONE)
<------><------>del_timer_sync(&state(hdlc)->timer);
<------>fr_set_link_state(0, dev);
}
 
 
static void fr_close(struct net_device *dev)
{
<------>hdlc_device *hdlc = dev_to_hdlc(dev);
<------>struct pvc_device *pvc = state(hdlc)->first_pvc;
 
<------>while (pvc) {		/* Shutdown all PVCs for this FRAD */
<------><------>if (pvc->main)
<------><------><------>dev_close(pvc->main);
<------><------>if (pvc->ether)
<------><------><------>dev_close(pvc->ether);
<------><------>pvc = pvc->next;
<------>}
}
 
 
static void pvc_setup(struct net_device *dev)
{
<------>dev->type = ARPHRD_DLCI;
<------>dev->flags = IFF_POINTOPOINT;
<------>dev->hard_header_len = 0;
<------>dev->addr_len = 2;
<------>netif_keep_dst(dev);
}
 
static const struct net_device_ops pvc_ops = {
<------>.ndo_open       = pvc_open,
<------>.ndo_stop       = pvc_close,
<------>.ndo_start_xmit = pvc_xmit,
<------>.ndo_do_ioctl   = pvc_ioctl,
};
 
static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
{
<------>hdlc_device *hdlc = dev_to_hdlc(frad);
<------>struct pvc_device *pvc;
<------>struct net_device *dev;
<------>int used;
 
<------>if ((pvc = add_pvc(frad, dlci)) == NULL) {
<------><------>netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
<------><------>return -ENOBUFS;
<------>}
 
<------>if (*get_dev_p(pvc, type))
<------><------>return -EEXIST;
 
<------>used = pvc_is_used(pvc);
 
<------>if (type == ARPHRD_ETHER)
<------><------>dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
<------><------><------><------>   ether_setup);
<------>else
<------><------>dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
 
<------>if (!dev) {
<------><------>netdev_warn(frad, "Memory squeeze on fr_pvc()\n");
<------><------>delete_unused_pvcs(hdlc);
<------><------>return -ENOBUFS;
<------>}
 
<------>if (type == ARPHRD_ETHER) {
<------><------>dev->priv_flags &= ~IFF_TX_SKB_SHARING;
<------><------>eth_hw_addr_random(dev);
<------>} else {
<------><------>*(__be16*)dev->dev_addr = htons(dlci);
<------><------>dlci_to_q922(dev->broadcast, dlci);
<------>}
<------>dev->netdev_ops = &pvc_ops;
<------>dev->mtu = HDLC_MAX_MTU;
<------>dev->min_mtu = 68;
<------>dev->max_mtu = HDLC_MAX_MTU;
<------>dev->needed_headroom = 10;
<------>dev->priv_flags |= IFF_NO_QUEUE;
<------>dev->ml_priv = pvc;
 
<------>if (register_netdevice(dev) != 0) {
<------><------>free_netdev(dev);
<------><------>delete_unused_pvcs(hdlc);
<------><------>return -EIO;
<------>}
 
<------>dev->needs_free_netdev = true;
<------>*get_dev_p(pvc, type) = dev;
<------>if (!used) {
<------><------>state(hdlc)->dce_changed = 1;
<------><------>state(hdlc)->dce_pvc_count++;
<------>}
<------>return 0;
}
 
 
 
static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
{
<------>struct pvc_device *pvc;
<------>struct net_device *dev;
 
<------>if ((pvc = find_pvc(hdlc, dlci)) == NULL)
<------><------>return -ENOENT;
 
<------>if ((dev = *get_dev_p(pvc, type)) == NULL)
<------><------>return -ENOENT;
 
<------>if (dev->flags & IFF_UP)
<------><------>return -EBUSY;		/* PVC in use */
 
<------>unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
<------>*get_dev_p(pvc, type) = NULL;
 
<------>if (!pvc_is_used(pvc)) {
<------><------>state(hdlc)->dce_pvc_count--;
<------><------>state(hdlc)->dce_changed = 1;
<------>}
<------>delete_unused_pvcs(hdlc);
<------>return 0;
}
 
 
 
static void fr_destroy(struct net_device *frad)
{
<------>hdlc_device *hdlc = dev_to_hdlc(frad);
<------>struct pvc_device *pvc = state(hdlc)->first_pvc;
<------>state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
<------>state(hdlc)->dce_pvc_count = 0;
<------>state(hdlc)->dce_changed = 1;
 
<------>while (pvc) {
<------><------>struct pvc_device *next = pvc->next;
<------><------>/* destructors will free_netdev() main and ether */
<------><------>if (pvc->main)
<------><------><------>unregister_netdevice(pvc->main);
 
<------><------>if (pvc->ether)
<------><------><------>unregister_netdevice(pvc->ether);
 
<------><------>kfree(pvc);
<------><------>pvc = next;
<------>}
}
 
 
static struct hdlc_proto proto = {
<------>.close		= fr_close,
<------>.start		= fr_start,
<------>.stop		= fr_stop,
<------>.detach		= fr_destroy,
<------>.ioctl		= fr_ioctl,
<------>.netif_rx	= fr_rx,
<------>.module		= THIS_MODULE,
};
 
 
static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
{
<------>fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
<------>const size_t size = sizeof(fr_proto);
<------>fr_proto new_settings;
<------>hdlc_device *hdlc = dev_to_hdlc(dev);
<------>fr_proto_pvc pvc;
<------>int result;
 
<------>switch (ifr->ifr_settings.type) {
<------>case IF_GET_PROTO:
<------><------>if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
<------><------><------>return -EINVAL;
<------><------>ifr->ifr_settings.type = IF_PROTO_FR;
<------><------>if (ifr->ifr_settings.size < size) {
<------><------><------>ifr->ifr_settings.size = size; /* data size wanted */
<------><------><------>return -ENOBUFS;
<------><------>}
<------><------>if (copy_to_user(fr_s, &state(hdlc)->settings, size))
<------><------><------>return -EFAULT;
<------><------>return 0;
 
<------>case IF_PROTO_FR:
<------><------>if (!capable(CAP_NET_ADMIN))
<------><------><------>return -EPERM;
 
<------><------>if (dev->flags & IFF_UP)
<------><------><------>return -EBUSY;
 
<------><------>if (copy_from_user(&new_settings, fr_s, size))
<------><------><------>return -EFAULT;
 
<------><------>if (new_settings.lmi == LMI_DEFAULT)
<------><------><------>new_settings.lmi = LMI_ANSI;
 
<------><------>if ((new_settings.lmi != LMI_NONE &&
<------><------>     new_settings.lmi != LMI_ANSI &&
<------><------>     new_settings.lmi != LMI_CCITT &&
<------><------>     new_settings.lmi != LMI_CISCO) ||
<------><------>    new_settings.t391 < 1 ||
<------><------>    new_settings.t392 < 2 ||
<------><------>    new_settings.n391 < 1 ||
<------><------>    new_settings.n392 < 1 ||
<------><------>    new_settings.n393 < new_settings.n392 ||
<------><------>    new_settings.n393 > 32 ||
<------><------>    (new_settings.dce != 0 &&
<------><------>     new_settings.dce != 1))
<------><------><------>return -EINVAL;
 
<------><------>result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
<------><------>if (result)
<------><------><------>return result;
 
<------><------>if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
<------><------><------>result = attach_hdlc_protocol(dev, &proto,
<------><------><------><------><------><------>      sizeof(struct frad_state));
<------><------><------>if (result)
<------><------><------><------>return result;
<------><------><------>state(hdlc)->first_pvc = NULL;
<------><------><------>state(hdlc)->dce_pvc_count = 0;
<------><------>}
<------><------>memcpy(&state(hdlc)->settings, &new_settings, size);
<------><------>dev->type = ARPHRD_FRAD;
<------><------>call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
<------><------>return 0;
 
<------>case IF_PROTO_FR_ADD_PVC:
<------>case IF_PROTO_FR_DEL_PVC:
<------>case IF_PROTO_FR_ADD_ETH_PVC:
<------>case IF_PROTO_FR_DEL_ETH_PVC:
<------><------>if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
<------><------><------>return -EINVAL;
 
<------><------>if (!capable(CAP_NET_ADMIN))
<------><------><------>return -EPERM;
 
<------><------>if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
<------><------><------><------>   sizeof(fr_proto_pvc)))
<------><------><------>return -EFAULT;
 
<------><------>if (pvc.dlci <= 0 || pvc.dlci >= 1024)
<------><------><------>return -EINVAL;	/* Only 10 bits, DLCI 0 reserved */
 
<------><------>if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
<------><------>    ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
<------><------><------>result = ARPHRD_ETHER; /* bridged Ethernet device */
<------><------>else
<------><------><------>result = ARPHRD_DLCI;
 
<------><------>if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
<------><------>    ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
<------><------><------>return fr_add_pvc(dev, pvc.dlci, result);
<------><------>else
<------><------><------>return fr_del_pvc(hdlc, pvc.dlci, result);
<------>}
 
<------>return -EINVAL;
}
 
 
static int __init mod_init(void)
{
<------>register_hdlc_protocol(&proto);
<------>return 0;
}
 
 
static void __exit mod_exit(void)
{
<------>unregister_hdlc_protocol(&proto);
}
 
 
module_init(mod_init);
module_exit(mod_exit);
 
MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
MODULE_LICENSE("GPL v2");