// SPDX-License-Identifier: GPL-2.0-only
/*
* Generic HDLC support routines for Linux
* Frame Relay support
*
* Copyright (C) 1999 - 2006 Krzysztof Halasa <[email protected]>
*
Theory of PVC state
DCE mode:
(exist,new) -> 0,0 when "PVC create" or if "link unreliable"
0,x -> 1,1 if "link reliable" when sending FULL STATUS
1,1 -> 1,0 if received FULL STATUS ACK
(active) -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"
-> 1 when "PVC up" and (exist,new) = 1,0
DTE mode:
(exist,new,active) = FULL STATUS if "link reliable"
= 0, 0, 0 if "link unreliable"
No LMI:
active = open and "link reliable"
exist = new = not used
CCITT LMI: ITU-T Q.933 Annex A
ANSI LMI: ANSI T1.617 Annex D
CISCO LMI: the original, aka "Gang of Four" LMI
*/
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/hdlc.h>
#include <linux/if_arp.h>
#include <linux/inetdevice.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pkt_sched.h>
#include <linux/poll.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#undef DEBUG_PKT
#undef DEBUG_ECN
#undef DEBUG_LINK
#undef DEBUG_PROTO
#undef DEBUG_PVC
#define FR_UI 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 if_settings *ifs);
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 if_settings *ifs)
{
struct pvc_device *pvc = dev->ml_priv;
fr_proto_pvc_info info;
if (ifs->type == IF_GET_PROTO) {
if (dev->type == ARPHRD_ETHER)
ifs->type = IF_PROTO_FR_ETH_PVC;
else
ifs->type = IF_PROTO_FR_PVC;
if (ifs->size < sizeof(info)) {
/* data size wanted */
ifs->size = sizeof(info);
return -ENOBUFS;
}
info.dlci = pvc->dlci;
memcpy(info.master, pvc->frad->name, IFNAMSIZ);
if (copy_to_user(ifs->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)
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_snap_parse(struct sk_buff *skb, struct pvc_device *pvc)
{
/* OUI 00-00-00 indicates an Ethertype follows */
if (skb->data[0] == 0x00 &&
skb->data[1] == 0x00 &&
skb->data[2] == 0x00) {
if (!pvc->main)
return -1;
skb->dev = pvc->main;
skb->protocol = *(__be16 *)(skb->data + 3); /* Ethertype */
skb_pull(skb, 5);
skb_reset_mac_header(skb);
return 0;
/* OUI 00-80-C2 stands for the 802.1 organization */
} else if (skb->data[0] == 0x00 &&
skb->data[1] == 0x80 &&
skb->data[2] == 0xC2) {
/* PID 00-07 stands for Ethernet frames without FCS */
if (skb->data[3] == 0x00 &&
skb->data[4] == 0x07) {
if (!pvc->ether)
return -1;
skb_pull(skb, 5);
if (skb->len < ETH_HLEN)
return -1;
skb->protocol = eth_type_trans(skb, pvc->ether);
return 0;
/* PID unsupported */
} else {
return -1;
}
/* OUI unsupported */
} else {
return -1;
}
}
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;
if (skb->len < 4 || fh->ea1 || !fh->ea2 || 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
goto 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;
}
skb = skb_share_check(skb, GFP_ATOMIC);
if (!skb) {
frad->stats.rx_dropped++;
return NET_RX_DROP;
}
if (data[3] == NLPID_IP) {
if (!pvc->main)
goto rx_drop;
skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
skb->dev = pvc->main;
skb->protocol = htons(ETH_P_IP);
skb_reset_mac_header(skb);
} else if (data[3] == NLPID_IPV6) {
if (!pvc->main)
goto rx_drop;
skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
skb->dev = pvc->main;
skb->protocol = htons(ETH_P_IPV6);
skb_reset_mac_header(skb);
} else if (data[3] == FR_PAD) {
if (skb->len < 5)
goto rx_error;
if (data[4] == NLPID_SNAP) { /* A SNAP header follows */
skb_pull(skb, 5);
if (skb->len < 5) /* Incomplete SNAP header */
goto rx_error;
if (fr_snap_parse(skb, pvc))
goto rx_drop;
} else {
goto rx_drop;
}
} else {
netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",
data[3], skb->len);
goto rx_drop;
}
dev = skb->dev;
dev->stats.rx_packets++; /* PVC traffic */
dev->stats.rx_bytes += skb->len;
if (pvc->state.becn)
dev->stats.rx_compressed++;
netif_rx(skb);
return NET_RX_SUCCESS;
rx_error:
frad->stats.rx_errors++; /* Mark error */
rx_drop:
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_siocwandev = 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;
pvc = add_pvc(frad, dlci);
if (!pvc) {
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 addr = htons(dlci);
dev_addr_set(dev, (u8 *)&addr);
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;
pvc = find_pvc(hdlc, dlci);
if (!pvc)
return -ENOENT;
dev = *get_dev_p(pvc, type);
if (!dev)
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 if_settings *ifs)
{
fr_proto __user *fr_s = ifs->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 (ifs->type) {
case IF_GET_PROTO:
if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
return -EINVAL;
ifs->type = IF_PROTO_FR;
if (ifs->size < size) {
ifs->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, ifs->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 (ifs->type == IF_PROTO_FR_ADD_ETH_PVC ||
ifs->type == IF_PROTO_FR_DEL_ETH_PVC)
result = ARPHRD_ETHER; /* bridged Ethernet device */
else
result = ARPHRD_DLCI;
if (ifs->type == IF_PROTO_FR_ADD_PVC ||
ifs->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 hdlc_fr_init(void)
{
register_hdlc_protocol(&proto);
return 0;
}
static void __exit hdlc_fr_exit(void)
{
unregister_hdlc_protocol(&proto);
}
module_init(hdlc_fr_init);
module_exit(hdlc_fr_exit);
MODULE_AUTHOR("Krzysztof Halasa <[email protected]>");
MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
MODULE_LICENSE("GPL v2");
Codebase Browser
linux