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linux/drivers/net/wan/hdlc_fr.c
Andrew Lunn 2f8364a291 WAN: HDLC: Call notifiers before and after changing device type 
An HDLC device can change type when the protocol driver is changed.
Calling the notifier change allows potential users of the interface
know about this planned change, and even block it. After the change
has occurred, send a second notification to users can evaluate the new
device type etc.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-12-05 17:41:42 -05:00

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/*
* Generic HDLC support routines for Linux
* Frame Relay support
*
* Copyright (C) 1999 - 2006 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
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;
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_p, u16 dlci)
{
u16 head_len;
struct sk_buff *skb = *skb_p;
switch (skb->protocol) {
case cpu_to_be16(NLPID_CCITT_ANSI_LMI):
head_len = 4;
skb_push(skb, head_len);
skb->data[3] = NLPID_CCITT_ANSI_LMI;
break;
case cpu_to_be16(NLPID_CISCO_LMI):
head_len = 4;
skb_push(skb, head_len);
skb->data[3] = NLPID_CISCO_LMI;
break;
case cpu_to_be16(ETH_P_IP):
head_len = 4;
skb_push(skb, head_len);
skb->data[3] = NLPID_IP;
break;
case cpu_to_be16(ETH_P_IPV6):
head_len = 4;
skb_push(skb, head_len);
skb->data[3] = NLPID_IPV6;
break;
case cpu_to_be16(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;
*(__be16*)(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)
{
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) {
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)) {
dev->stats.tx_dropped++;
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
skb_put(skb, pad);
memset(skb->data + len, 0, pad);
}
skb->protocol = cpu_to_be16(ETH_P_802_3);
}
if (!fr_hard_header(&skb, pvc->dlci)) {
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;
dev_queue_xmit(skb);
return NETDEV_TX_OK;
}
}
dev->stats.tx_dropped++;
dev_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) {
skb->protocol = cpu_to_be16(NLPID_CISCO_LMI);
fr_hard_header(&skb, LMI_CISCO_DLCI);
} else {
skb->protocol = cpu_to_be16(NLPID_CCITT_ANSI_LMI);
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_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(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 (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;
}
state(hdlc)->timer.function = fr_timer;
state(hdlc)->timer.data = arg;
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;
init_timer(&state(hdlc)->timer);
/* First poll after 1 s */
state(hdlc)->timer.expires = jiffies + HZ;
state(hdlc)->timer.function = fr_timer;
state(hdlc)->timer.data = (unsigned long)dev;
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 = 10;
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_change_mtu = hdlc_change_mtu,
.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->priv_flags |= IFF_NO_QUEUE;
dev->ml_priv = pvc;
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) {
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");
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