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linux/drivers/net/wan/hdlc_fr.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

1237 lines
28 KiB
C
Raw Blame History

/*
* Generic HDLC support routines for Linux
* Frame Relay support
*
* Copyright (C) 1999 - 2003 Krzysztof Halasa <khc@pm.waw.pl>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License
* as published by the Free Software Foundation.
*
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
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/pkt_sched.h>
#include <linux/random.h>
#include <linux/inetdevice.h>
#include <linux/lapb.h>
#include <linux/rtnetlink.h>
#include <linux/etherdevice.h>
#include <linux/hdlc.h>
#undef DEBUG_PKT
#undef DEBUG_ECN
#undef DEBUG_LINK
#define MAXLEN_LMISTAT 20 /* max size of status enquiry frame */
#define PVC_STATE_NEW 0x01
#define PVC_STATE_ACTIVE 0x02
#define PVC_STATE_FECN 0x08 /* FECN condition */
#define PVC_STATE_BECN 0x10 /* BECN condition */
#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_Q933 0x08
#define LMI_DLCI 0 /* LMI DLCI */
#define LMI_PROTO 0x08
#define LMI_CALLREF 0x00 /* Call Reference */
#define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI lockshift */
#define LMI_REPTYPE 1 /* report type */
#define LMI_CCITT_REPTYPE 0x51
#define LMI_ALIVE 3 /* keep alive */
#define LMI_CCITT_ALIVE 0x53
#define LMI_PVCSTAT 7 /* pvc status */
#define LMI_CCITT_PVCSTAT 0x57
#define LMI_FULLREP 0 /* full report */
#define LMI_INTEGRITY 1 /* link integrity report */
#define LMI_SINGLE 2 /* 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_LENGTH 13 /* standard LMI frame length */
#define LMI_ANSI_LENGTH 14
typedef struct {
#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
}__attribute__ ((packed)) fr_hdr;
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 pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
{
pvc_device *pvc = hdlc->state.fr.first_pvc;
while (pvc) {
if (pvc->dlci == dlci)
return pvc;
if (pvc->dlci > dlci)
return NULL; /* the listed is sorted */
pvc = pvc->next;
}
return NULL;
}
static inline pvc_device* add_pvc(struct net_device *dev, u16 dlci)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
pvc_device *pvc, **pvc_p = &hdlc->state.fr.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 = kmalloc(sizeof(pvc_device), GFP_ATOMIC);
if (!pvc)
return NULL;
memset(pvc, 0, sizeof(pvc_device));
pvc->dlci = dlci;
pvc->master = dev;
pvc->next = *pvc_p; /* Put it in the chain */
*pvc_p = pvc;
return pvc;
}
static inline int pvc_is_used(pvc_device *pvc)
{
return pvc->main != NULL || pvc->ether != NULL;
}
static inline void pvc_carrier(int on, 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)
{
pvc_device **pvc_p = &hdlc->state.fr.first_pvc;
while (*pvc_p) {
if (!pvc_is_used(*pvc_p)) {
pvc_device *pvc = *pvc_p;
*pvc_p = pvc->next;
kfree(pvc);
continue;
}
pvc_p = &(*pvc_p)->next;
}
}
static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
{
if (type == ARPHRD_ETHER)
return &pvc->ether;
else
return &pvc->main;
}
static inline u16 status_to_dlci(u8 *status, int *active, int *new)
{
*new = (status[2] & 0x08) ? 1 : 0;
*active = (status[2] & 0x02) ? 1 : 0;
return ((status[0] & 0x3F) << 4) | ((status[1] & 0x78) >> 3);
}
static inline void dlci_to_status(u16 dlci, u8 *status, int active, int new)
{
status[0] = (dlci >> 4) & 0x3F;
status[1] = ((dlci << 3) & 0x78) | 0x80;
status[2] = 0x80;
if (new)
status[2] |= 0x08;
else if (active)
status[2] |= 0x02;
}
static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
{
u16 head_len;
struct sk_buff *skb = *skb_p;
switch (skb->protocol) {
case __constant_ntohs(ETH_P_IP):
head_len = 4;
skb_push(skb, head_len);
skb->data[3] = NLPID_IP;
break;
case __constant_ntohs(ETH_P_IPV6):
head_len = 4;
skb_push(skb, head_len);
skb->data[3] = NLPID_IPV6;
break;
case __constant_ntohs(LMI_PROTO):
head_len = 4;
skb_push(skb, head_len);
skb->data[3] = LMI_PROTO;
break;
case __constant_ntohs(ETH_P_802_3):
head_len = 10;
if (skb_headroom(skb) < head_len) {
struct sk_buff *skb2 = skb_realloc_headroom(skb,
head_len);
if (!skb2)
return -ENOBUFS;
dev_kfree_skb(skb);
skb = *skb_p = skb2;
}
skb_push(skb, head_len);
skb->data[3] = FR_PAD;
skb->data[4] = NLPID_SNAP;
skb->data[5] = FR_PAD;
skb->data[6] = 0x80;
skb->data[7] = 0xC2;
skb->data[8] = 0x00;
skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
break;
default:
head_len = 10;
skb_push(skb, head_len);
skb->data[3] = FR_PAD;
skb->data[4] = NLPID_SNAP;
skb->data[5] = FR_PAD;
skb->data[6] = FR_PAD;
skb->data[7] = FR_PAD;
*(u16*)(skb->data + 8) = skb->protocol;
}
dlci_to_q922(skb->data, dlci);
skb->data[2] = FR_UI;
return 0;
}
static int pvc_open(struct net_device *dev)
{
pvc_device *pvc = dev_to_pvc(dev);
if ((pvc->master->flags & IFF_UP) == 0)
return -EIO; /* Master must be UP in order to activate PVC */
if (pvc->open_count++ == 0) {
hdlc_device *hdlc = dev_to_hdlc(pvc->master);
if (hdlc->state.fr.settings.lmi == LMI_NONE)
pvc->state.active = hdlc->carrier;
pvc_carrier(pvc->state.active, pvc);
hdlc->state.fr.dce_changed = 1;
}
return 0;
}
static int pvc_close(struct net_device *dev)
{
pvc_device *pvc = dev_to_pvc(dev);
if (--pvc->open_count == 0) {
hdlc_device *hdlc = dev_to_hdlc(pvc->master);
if (hdlc->state.fr.settings.lmi == LMI_NONE)
pvc->state.active = 0;
if (hdlc->state.fr.settings.dce) {
hdlc->state.fr.dce_changed = 1;
pvc->state.active = 0;
}
}
return 0;
}
int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
pvc_device *pvc = dev_to_pvc(dev);
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->master->name, IFNAMSIZ);
if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
&info, sizeof(info)))
return -EFAULT;
return 0;
}
return -EINVAL;
}
static inline struct net_device_stats *pvc_get_stats(struct net_device *dev)
{
return netdev_priv(dev);
}
static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
{
pvc_device *pvc = dev_to_pvc(dev);
struct net_device_stats *stats = pvc_get_stats(dev);
if (pvc->state.active) {
if (dev->type == ARPHRD_ETHER) {
int pad = ETH_ZLEN - skb->len;
if (pad > 0) { /* Pad the frame with zeros */
int len = skb->len;
if (skb_tailroom(skb) < pad)
if (pskb_expand_head(skb, 0, pad,
GFP_ATOMIC)) {
stats->tx_dropped++;
dev_kfree_skb(skb);
return 0;
}
skb_put(skb, pad);
memset(skb->data + len, 0, pad);
}
skb->protocol = __constant_htons(ETH_P_802_3);
}
if (!fr_hard_header(&skb, pvc->dlci)) {
stats->tx_bytes += skb->len;
stats->tx_packets++;
if (pvc->state.fecn) /* TX Congestion counter */
stats->tx_compressed++;
skb->dev = pvc->master;
dev_queue_xmit(skb);
return 0;
}
}
stats->tx_dropped++;
dev_kfree_skb(skb);
return 0;
}
static int pvc_change_mtu(struct net_device *dev, int new_mtu)
{
if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
return -EINVAL;
dev->mtu = new_mtu;
return 0;
}
static inline void fr_log_dlci_active(pvc_device *pvc)
{
printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
pvc->master->name,
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;
pvc_device *pvc = hdlc->state.fr.first_pvc;
int len = (hdlc->state.fr.settings.lmi == LMI_ANSI) ? LMI_ANSI_LENGTH
: LMI_LENGTH;
int stat_len = 3;
u8 *data;
int i = 0;
if (hdlc->state.fr.settings.dce && fullrep) {
len += hdlc->state.fr.dce_pvc_count * (2 + stat_len);
if (len > HDLC_MAX_MRU) {
printk(KERN_WARNING "%s: Too many PVCs while sending "
"LMI full report\n", dev->name);
return;
}
}
skb = dev_alloc_skb(len);
if (!skb) {
printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
dev->name);
return;
}
memset(skb->data, 0, len);
skb_reserve(skb, 4);
skb->protocol = __constant_htons(LMI_PROTO);
fr_hard_header(&skb, LMI_DLCI);
data = skb->tail;
data[i++] = LMI_CALLREF;
data[i++] = hdlc->state.fr.settings.dce
? LMI_STATUS : LMI_STATUS_ENQUIRY;
if (hdlc->state.fr.settings.lmi == LMI_ANSI)
data[i++] = LMI_ANSI_LOCKSHIFT;
data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT)
? LMI_CCITT_REPTYPE : LMI_REPTYPE;
data[i++] = LMI_REPT_LEN;
data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT)
? LMI_CCITT_ALIVE : LMI_ALIVE;
data[i++] = LMI_INTEG_LEN;
data[i++] = hdlc->state.fr.txseq =fr_lmi_nextseq(hdlc->state.fr.txseq);
data[i++] = hdlc->state.fr.rxseq;
if (hdlc->state.fr.settings.dce && fullrep) {
while (pvc) {
data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT)
? LMI_CCITT_PVCSTAT : LMI_PVCSTAT;
data[i++] = stat_len;
/* LMI start/restart */
if (hdlc->state.fr.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);
}
dlci_to_status(pvc->dlci, data + i,
pvc->state.active, pvc->state.new);
i += stat_len;
pvc = pvc->next;
}
}
skb_put(skb, i);
skb->priority = TC_PRIO_CONTROL;
skb->dev = dev;
skb->nh.raw = skb->data;
dev_queue_xmit(skb);
}
static void fr_set_link_state(int reliable, struct net_device *dev)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
pvc_device *pvc = hdlc->state.fr.first_pvc;
hdlc->state.fr.reliable = reliable;
if (reliable) {
if (!netif_carrier_ok(dev))
netif_carrier_on(dev);
hdlc->state.fr.n391cnt = 0; /* Request full status */
hdlc->state.fr.dce_changed = 1;
if (hdlc->state.fr.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 {
if (netif_carrier_ok(dev))
netif_carrier_off(dev);
while (pvc) { /* Deactivate all PVCs */
pvc_carrier(0, pvc);
pvc->state.exist = pvc->state.active = 0;
pvc->state.new = 0;
pvc = pvc->next;
}
}
}
static void fr_timer(unsigned long arg)
{
struct net_device *dev = (struct net_device *)arg;
hdlc_device *hdlc = dev_to_hdlc(dev);
int i, cnt = 0, reliable;
u32 list;
if (hdlc->state.fr.settings.dce)
reliable = hdlc->state.fr.request &&
time_before(jiffies, hdlc->state.fr.last_poll +
hdlc->state.fr.settings.t392 * HZ);
else {
hdlc->state.fr.last_errors <<= 1; /* Shift the list */
if (hdlc->state.fr.request) {
if (hdlc->state.fr.reliable)
printk(KERN_INFO "%s: No LMI status reply "
"received\n", dev->name);
hdlc->state.fr.last_errors |= 1;
}
list = hdlc->state.fr.last_errors;
for (i = 0; i < hdlc->state.fr.settings.n393; i++, list >>= 1)
cnt += (list & 1); /* errors count */
reliable = (cnt < hdlc->state.fr.settings.n392);
}
if (hdlc->state.fr.reliable != reliable) {
printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
reliable ? "" : "un");
fr_set_link_state(reliable, dev);
}
if (hdlc->state.fr.settings.dce)
hdlc->state.fr.timer.expires = jiffies +
hdlc->state.fr.settings.t392 * HZ;
else {
if (hdlc->state.fr.n391cnt)
hdlc->state.fr.n391cnt--;
fr_lmi_send(dev, hdlc->state.fr.n391cnt == 0);
hdlc->state.fr.last_poll = jiffies;
hdlc->state.fr.request = 1;
hdlc->state.fr.timer.expires = jiffies +
hdlc->state.fr.settings.t391 * HZ;
}
hdlc->state.fr.timer.function = fr_timer;
hdlc->state.fr.timer.data = arg;
add_timer(&hdlc->state.fr.timer);
}
static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
int stat_len;
pvc_device *pvc;
int reptype = -1, error, no_ram;
u8 rxseq, txseq;
int i;
if (skb->len < ((hdlc->state.fr.settings.lmi == LMI_ANSI)
? LMI_ANSI_LENGTH : LMI_LENGTH)) {
printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
return 1;
}
if (skb->data[5] != (!hdlc->state.fr.settings.dce ?
LMI_STATUS : LMI_STATUS_ENQUIRY)) {
printk(KERN_INFO "%s: LMI msgtype=%x, Not LMI status %s\n",
dev->name, skb->data[2],
hdlc->state.fr.settings.dce ? "enquiry" : "reply");
return 1;
}
i = (hdlc->state.fr.settings.lmi == LMI_ANSI) ? 7 : 6;
if (skb->data[i] !=
((hdlc->state.fr.settings.lmi == LMI_CCITT)
? LMI_CCITT_REPTYPE : LMI_REPTYPE)) {
printk(KERN_INFO "%s: Not a report type=%x\n",
dev->name, skb->data[i]);
return 1;
}
i++;
i++; /* Skip length field */
reptype = skb->data[i++];
if (skb->data[i]!=
((hdlc->state.fr.settings.lmi == LMI_CCITT)
? LMI_CCITT_ALIVE : LMI_ALIVE)) {
printk(KERN_INFO "%s: Unsupported status element=%x\n",
dev->name, skb->data[i]);
return 1;
}
i++;
i++; /* Skip length field */
hdlc->state.fr.rxseq = skb->data[i++]; /* TX sequence from peer */
rxseq = skb->data[i++]; /* Should confirm our sequence */
txseq = hdlc->state.fr.txseq;
if (hdlc->state.fr.settings.dce) {
if (reptype != LMI_FULLREP && reptype != LMI_INTEGRITY) {
printk(KERN_INFO "%s: Unsupported report type=%x\n",
dev->name, reptype);
return 1;
}
hdlc->state.fr.last_poll = jiffies;
}
error = 0;
if (!hdlc->state.fr.reliable)
error = 1;
if (rxseq == 0 || rxseq != txseq) {
hdlc->state.fr.n391cnt = 0; /* Ask for full report next time */
error = 1;
}
if (hdlc->state.fr.settings.dce) {
if (hdlc->state.fr.fullrep_sent && !error) {
/* Stop sending full report - the last one has been confirmed by DTE */
hdlc->state.fr.fullrep_sent = 0;
pvc = hdlc->state.fr.first_pvc;
while (pvc) {
if (pvc->state.new) {
pvc->state.new = 0;
/* Tell DTE that new PVC is now active */
hdlc->state.fr.dce_changed = 1;
}
pvc = pvc->next;
}
}
if (hdlc->state.fr.dce_changed) {
reptype = LMI_FULLREP;
hdlc->state.fr.fullrep_sent = 1;
hdlc->state.fr.dce_changed = 0;
}
fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
return 0;
}
/* DTE */
hdlc->state.fr.request = 0; /* got response, no request pending */
if (error)
return 0;
if (reptype != LMI_FULLREP)
return 0;
stat_len = 3;
pvc = hdlc->state.fr.first_pvc;
while (pvc) {
pvc->state.deleted = 1;
pvc = pvc->next;
}
no_ram = 0;
while (skb->len >= i + 2 + stat_len) {
u16 dlci;
unsigned int active, new;
if (skb->data[i] != ((hdlc->state.fr.settings.lmi == LMI_CCITT)
? LMI_CCITT_PVCSTAT : LMI_PVCSTAT)) {
printk(KERN_WARNING "%s: Invalid PVCSTAT ID: %x\n",
dev->name, skb->data[i]);
return 1;
}
i++;
if (skb->data[i] != stat_len) {
printk(KERN_WARNING "%s: Invalid PVCSTAT length: %x\n",
dev->name, skb->data[i]);
return 1;
}
i++;
dlci = status_to_dlci(skb->data + i, &active, &new);
pvc = add_pvc(dev, dlci);
if (!pvc && !no_ram) {
printk(KERN_WARNING
"%s: Memory squeeze on fr_lmi_recv()\n",
dev->name);
no_ram = 1;
}
if (pvc) {
pvc->state.exist = 1;
pvc->state.deleted = 0;
if (active != pvc->state.active ||
new != pvc->state.new ||
!pvc->state.exist) {
pvc->state.new = new;
pvc->state.active = active;
pvc_carrier(active, pvc);
fr_log_dlci_active(pvc);
}
}
i += stat_len;
}
pvc = hdlc->state.fr.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;
fr_log_dlci_active(pvc);
}
pvc = pvc->next;
}
/* Next full report after N391 polls */
hdlc->state.fr.n391cnt = hdlc->state.fr.settings.n391;
return 0;
}
static int fr_rx(struct sk_buff *skb)
{
struct net_device *ndev = skb->dev;
hdlc_device *hdlc = dev_to_hdlc(ndev);
fr_hdr *fh = (fr_hdr*)skb->data;
u8 *data = skb->data;
u16 dlci;
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_DLCI) {
if (hdlc->state.fr.settings.lmi == LMI_NONE)
goto rx_error; /* LMI packet with no LMI? */
if (data[3] == LMI_PROTO) {
if (fr_lmi_recv(ndev, skb))
goto rx_error;
else {
dev_kfree_skb_any(skb);
return NET_RX_SUCCESS;
}
}
printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
ndev->name);
goto rx_error;
}
pvc = find_pvc(hdlc, dlci);
if (!pvc) {
#ifdef DEBUG_PKT
printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
ndev->name, 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", ndev->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", ndev->name,
dlci, fh->becn ? "N" : "FF");
#endif
pvc->state.becn ^= 1;
}
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
hdlc->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(*(u16*)(data + 6));
u16 pid = ntohs(*(u16*)(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:
printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
"PID=%x\n", ndev->name, oui, pid);
dev_kfree_skb_any(skb);
return NET_RX_DROP;
}
} else {
printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
"length = %i\n", ndev->name, data[3], skb->len);
dev_kfree_skb_any(skb);
return NET_RX_DROP;
}
if (dev) {
struct net_device_stats *stats = pvc_get_stats(dev);
stats->rx_packets++; /* PVC traffic */
stats->rx_bytes += skb->len;
if (pvc->state.becn)
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:
hdlc->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 (hdlc->state.fr.settings.lmi != LMI_NONE) {
hdlc->state.fr.reliable = 0;
hdlc->state.fr.dce_changed = 1;
hdlc->state.fr.request = 0;
hdlc->state.fr.fullrep_sent = 0;
hdlc->state.fr.last_errors = 0xFFFFFFFF;
hdlc->state.fr.n391cnt = 0;
hdlc->state.fr.txseq = hdlc->state.fr.rxseq = 0;
init_timer(&hdlc->state.fr.timer);
/* First poll after 1 s */
hdlc->state.fr.timer.expires = jiffies + HZ;
hdlc->state.fr.timer.function = fr_timer;
hdlc->state.fr.timer.data = (unsigned long)dev;
add_timer(&hdlc->state.fr.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 (hdlc->state.fr.settings.lmi != LMI_NONE)
del_timer_sync(&hdlc->state.fr.timer);
fr_set_link_state(0, dev);
}
static void fr_close(struct net_device *dev)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
pvc_device *pvc = hdlc->state.fr.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 dlci_setup(struct net_device *dev)
{
dev->type = ARPHRD_DLCI;
dev->flags = IFF_POINTOPOINT;
dev->hard_header_len = 10;
dev->addr_len = 2;
}
static int fr_add_pvc(struct net_device *master, unsigned int dlci, int type)
{
hdlc_device *hdlc = dev_to_hdlc(master);
pvc_device *pvc = NULL;
struct net_device *dev;
int result, used;
char * prefix = "pvc%d";
if (type == ARPHRD_ETHER)
prefix = "pvceth%d";
if ((pvc = add_pvc(master, dlci)) == NULL) {
printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
master->name);
return -ENOBUFS;
}
if (*get_dev_p(pvc, type))
return -EEXIST;
used = pvc_is_used(pvc);
if (type == ARPHRD_ETHER)
dev = alloc_netdev(sizeof(struct net_device_stats),
"pvceth%d", ether_setup);
else
dev = alloc_netdev(sizeof(struct net_device_stats),
"pvc%d", dlci_setup);
if (!dev) {
printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
master->name);
delete_unused_pvcs(hdlc);
return -ENOBUFS;
}
if (type == ARPHRD_ETHER) {
memcpy(dev->dev_addr, "\x00\x01", 2);
get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2);
} else {
*(u16*)dev->dev_addr = htons(dlci);
dlci_to_q922(dev->broadcast, dlci);
}
dev->hard_start_xmit = pvc_xmit;
dev->get_stats = pvc_get_stats;
dev->open = pvc_open;
dev->stop = pvc_close;
dev->do_ioctl = pvc_ioctl;
dev->change_mtu = pvc_change_mtu;
dev->mtu = HDLC_MAX_MTU;
dev->tx_queue_len = 0;
dev->priv = pvc;
result = dev_alloc_name(dev, dev->name);
if (result < 0) {
free_netdev(dev);
delete_unused_pvcs(hdlc);
return result;
}
if (register_netdevice(dev) != 0) {
free_netdev(dev);
delete_unused_pvcs(hdlc);
return -EIO;
}
dev->destructor = free_netdev;
*get_dev_p(pvc, type) = dev;
if (!used) {
hdlc->state.fr.dce_changed = 1;
hdlc->state.fr.dce_pvc_count++;
}
return 0;
}
static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
{
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)) {
hdlc->state.fr.dce_pvc_count--;
hdlc->state.fr.dce_changed = 1;
}
delete_unused_pvcs(hdlc);
return 0;
}
static void fr_destroy(hdlc_device *hdlc)
{
pvc_device *pvc;
pvc = hdlc->state.fr.first_pvc;
hdlc->state.fr.first_pvc = NULL; /* All PVCs destroyed */
hdlc->state.fr.dce_pvc_count = 0;
hdlc->state.fr.dce_changed = 1;
while (pvc) {
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;
}
}
int hdlc_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:
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, &hdlc->state.fr.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.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 (hdlc->proto.id != IF_PROTO_FR) {
hdlc_proto_detach(hdlc);
hdlc->state.fr.first_pvc = NULL;
hdlc->state.fr.dce_pvc_count = 0;
}
memcpy(&hdlc->state.fr.settings, &new_settings, size);
memset(&hdlc->proto, 0, sizeof(hdlc->proto));
hdlc->proto.close = fr_close;
hdlc->proto.start = fr_start;
hdlc->proto.stop = fr_stop;
hdlc->proto.detach = fr_destroy;
hdlc->proto.netif_rx = fr_rx;
hdlc->proto.id = IF_PROTO_FR;
dev->hard_start_xmit = hdlc->xmit;
dev->hard_header = NULL;
dev->type = ARPHRD_FRAD;
dev->flags = IFF_POINTOPOINT | IFF_NOARP;
dev->addr_len = 0;
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(!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;
}
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