hdlc.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:32k
- /*
- * Generic HDLC support routines for Linux
- *
- * Copyright (C) 1999, 2000 Krzysztof Halasa <khc@pm.waw.pl>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * Current status:
- * - this is work in progress
- * - not heavily tested on SMP
- * - currently supported:
- * * raw IP-in-HDLC
- * * Cisco HDLC
- * * Frame Relay with ANSI or CCITT LMI (both user and network side)
- * * PPP (using syncppp.c)
- * * X.25
- *
- * Use sethdlc utility to set line parameters, protocol and PVCs
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/slab.h>
- #include <linux/poll.h>
- #include <linux/sched.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/inetdevice.h>
- #include <linux/lapb.h>
- #include <linux/rtnetlink.h>
- #include <linux/hdlc.h>
- /* #define DEBUG_PKT */
- /* #define DEBUG_HARD_HEADER */
- /* #define DEBUG_FECN */
- /* #define DEBUG_BECN */
- static const char* version = "HDLC support module revision 1.02 for Linux 2.4";
- #define CISCO_MULTICAST 0x8F /* Cisco multicast address */
- #define CISCO_UNICAST 0x0F /* Cisco unicast address */
- #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
- #define CISCO_SYS_INFO 0x2000 /* Cisco interface/system info */
- #define CISCO_ADDR_REQ 0 /* Cisco address request */
- #define CISCO_ADDR_REPLY 1 /* Cisco address reply */
- #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
- static int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
- /********************************************************
- *
- * Cisco HDLC support
- *
- *******************************************************/
- static int cisco_hard_header(struct sk_buff *skb, struct net_device *dev,
- u16 type, void *daddr, void *saddr,
- unsigned int len)
- {
- hdlc_header *data;
- #ifdef DEBUG_HARD_HEADER
- printk(KERN_DEBUG "%s: cisco_hard_header calledn", dev->name);
- #endif
- skb_push(skb, sizeof(hdlc_header));
- data = (hdlc_header*)skb->data;
- if (type == CISCO_KEEPALIVE)
- data->address = CISCO_MULTICAST;
- else
- data->address = CISCO_UNICAST;
- data->control = 0;
- data->protocol = htons(type);
- return sizeof(hdlc_header);
- }
- static void cisco_keepalive_send(hdlc_device *hdlc, u32 type,
- u32 par1, u32 par2)
- {
- struct sk_buff *skb;
- cisco_packet *data;
- skb = dev_alloc_skb(sizeof(hdlc_header)+sizeof(cisco_packet));
- if (!skb) {
- printk(KERN_WARNING "%s: Memory squeeze on cisco_keepalive_send()n",
- hdlc_to_name(hdlc));
- return;
- }
- skb_reserve(skb, 4);
- cisco_hard_header(skb, hdlc_to_dev(hdlc), CISCO_KEEPALIVE,
- NULL, NULL, 0);
- data = (cisco_packet*)skb->tail;
- data->type = htonl(type);
- data->par1 = htonl(par1);
- data->par2 = htonl(par2);
- data->rel = 0xFFFF;
- data->time = htonl(jiffies * 1000 / HZ);
- skb_put(skb, sizeof(cisco_packet));
- skb->priority = TC_PRIO_CONTROL;
- skb->dev = hdlc_to_dev(hdlc);
- dev_queue_xmit(skb);
- }
- static void cisco_netif(hdlc_device *hdlc, struct sk_buff *skb)
- {
- hdlc_header *data = (hdlc_header*)skb->data;
- cisco_packet *cisco_data;
- struct in_device *in_dev;
- u32 addr, mask;
- if (skb->len<sizeof(hdlc_header))
- goto rx_error;
- if (data->address != CISCO_MULTICAST &&
- data->address != CISCO_UNICAST)
- goto rx_error;
- skb_pull(skb, sizeof(hdlc_header));
- switch(ntohs(data->protocol)) {
- case ETH_P_IP:
- case ETH_P_IPX:
- case ETH_P_IPV6:
- skb->protocol = data->protocol;
- skb->dev = hdlc_to_dev(hdlc);
- netif_rx(skb);
- return;
- case CISCO_SYS_INFO:
- /* Packet is not needed, drop it. */
- dev_kfree_skb_any(skb);
- return;
- case CISCO_KEEPALIVE:
- if (skb->len != CISCO_PACKET_LEN &&
- skb->len != CISCO_BIG_PACKET_LEN) {
- printk(KERN_INFO "%s: Invalid length of Cisco "
- "control packet (%d bytes)n",
- hdlc_to_name(hdlc), skb->len);
- goto rx_error;
- }
- cisco_data = (cisco_packet*)skb->data;
- switch(ntohl (cisco_data->type)) {
- case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */
- in_dev = hdlc_to_dev(hdlc)->ip_ptr;
- addr = 0;
- mask = ~0; /* is the mask correct? */
- if (in_dev != NULL) {
- struct in_ifaddr **ifap = &in_dev->ifa_list;
- while (*ifap != NULL) {
- if (strcmp(hdlc_to_name(hdlc),
- (*ifap)->ifa_label) == 0) {
- addr = (*ifap)->ifa_local;
- mask = (*ifap)->ifa_mask;
- break;
- }
- ifap = &(*ifap)->ifa_next;
- }
- cisco_keepalive_send(hdlc, CISCO_ADDR_REPLY,
- addr, mask);
- }
- dev_kfree_skb_any(skb);
- return;
- case CISCO_ADDR_REPLY:
- printk(KERN_INFO "%s: Unexpected Cisco IP address "
- "replyn", hdlc_to_name(hdlc));
- goto rx_error;
- case CISCO_KEEPALIVE_REQ:
- hdlc->lmi.rxseq = ntohl(cisco_data->par1);
- if (ntohl(cisco_data->par2) == hdlc->lmi.txseq) {
- hdlc->lmi.last_poll = jiffies;
- if (!(hdlc->lmi.state & LINK_STATE_RELIABLE)) {
- u32 sec, min, hrs, days;
- sec = ntohl(cisco_data->time) / 1000;
- min = sec / 60; sec -= min * 60;
- hrs = min / 60; min -= hrs * 60;
- days = hrs / 24; hrs -= days * 24;
- printk(KERN_INFO "%s: Link up (peer "
- "uptime %ud%uh%um%us)n",
- hdlc_to_name(hdlc), days, hrs,
- min, sec);
- }
- hdlc->lmi.state |= LINK_STATE_RELIABLE;
- }
- dev_kfree_skb_any(skb);
- return;
- } /* switch(keepalive type) */
- } /* switch(protocol) */
- printk(KERN_INFO "%s: Unsupported protocol %xn", hdlc_to_name(hdlc),
- data->protocol);
- dev_kfree_skb_any(skb);
- return;
- rx_error:
- hdlc->stats.rx_errors++; /* Mark error */
- dev_kfree_skb_any(skb);
- }
- static void cisco_timer(unsigned long arg)
- {
- hdlc_device *hdlc = (hdlc_device*)arg;
- if ((hdlc->lmi.state & LINK_STATE_RELIABLE) &&
- (jiffies - hdlc->lmi.last_poll >= hdlc->lmi.T392 * HZ)) {
- hdlc->lmi.state &= ~LINK_STATE_RELIABLE;
- printk(KERN_INFO "%s: Link downn", hdlc_to_name(hdlc));
- }
- cisco_keepalive_send(hdlc, CISCO_KEEPALIVE_REQ, ++hdlc->lmi.txseq,
- hdlc->lmi.rxseq);
- hdlc->timer.expires = jiffies + hdlc->lmi.T391*HZ;
- hdlc->timer.function = cisco_timer;
- hdlc->timer.data = arg;
- add_timer(&hdlc->timer);
- }
- /******************************************************************
- *
- * generic Frame Relay routines
- *
- *****************************************************************/
- static int fr_hard_header(struct sk_buff *skb, struct net_device *dev,
- u16 type, void *daddr, void *saddr, unsigned int len)
- {
- u16 head_len;
- if (!daddr)
- daddr = dev->broadcast;
- #ifdef DEBUG_HARD_HEADER
- printk(KERN_DEBUG "%s: fr_hard_header calledn", dev->name);
- #endif
- switch(type) {
- case ETH_P_IP:
- head_len = 4;
- skb_push(skb, head_len);
- skb->data[3] = NLPID_IP;
- break;
- case ETH_P_IPV6:
- head_len = 4;
- skb_push(skb, head_len);
- skb->data[3] = NLPID_IPV6;
- break;
- case LMI_PROTO:
- head_len = 4;
- skb_push(skb, head_len);
- skb->data[3] = LMI_PROTO;
- 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;
- skb->data[8] = type>>8;
- skb->data[9] = (u8)type;
- }
- memcpy(skb->data, daddr, 2);
- skb->data[2] = FR_UI;
- return head_len;
- }
- static inline void fr_log_dlci_active(pvc_device *pvc)
- {
- printk(KERN_INFO "%s: %sactive%sn", pvc_to_name(pvc),
- pvc->state & PVC_STATE_ACTIVE ? "" : "in",
- pvc->state & PVC_STATE_NEW ? " new" : "");
- }
- static inline u8 fr_lmi_nextseq(u8 x)
- {
- x++;
- return x ? x : 1;
- }
- static void fr_lmi_send(hdlc_device *hdlc, int fullrep)
- {
- struct sk_buff *skb;
- pvc_device *pvc = hdlc->first_pvc;
- int len = mode_is(hdlc, MODE_FR_ANSI) ? LMI_ANSI_LENGTH : LMI_LENGTH;
- int stat_len = 3;
- u8 *data;
- int i = 0;
- if (mode_is(hdlc, MODE_DCE) && fullrep) {
- len += hdlc->pvc_count * (2 + stat_len);
- if (len > HDLC_MAX_MTU) {
- printk(KERN_WARNING "%s: Too many PVCs while sending "
- "LMI full reportn", hdlc_to_name(hdlc));
- return;
- }
- }
- skb = dev_alloc_skb(len);
- if (!skb) {
- printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()n",
- hdlc_to_name(hdlc));
- return;
- }
- memset(skb->data, 0, len);
- skb_reserve(skb, 4);
- fr_hard_header(skb, hdlc_to_dev(hdlc), LMI_PROTO, NULL, NULL, 0);
- data = skb->tail;
- data[i++] = LMI_CALLREF;
- data[i++] = mode_is(hdlc, MODE_DCE) ? LMI_STATUS : LMI_STATUS_ENQUIRY;
- if (mode_is(hdlc, MODE_FR_ANSI))
- data[i++] = LMI_ANSI_LOCKSHIFT;
- data[i++] = mode_is(hdlc, MODE_FR_CCITT) ? LMI_CCITT_REPTYPE :
- LMI_REPTYPE;
- data[i++] = LMI_REPT_LEN;
- data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
- data[i++] = mode_is(hdlc, MODE_FR_CCITT) ? LMI_CCITT_ALIVE : LMI_ALIVE;
- data[i++] = LMI_INTEG_LEN;
- data[i++] = hdlc->lmi.txseq = fr_lmi_nextseq(hdlc->lmi.txseq);
- data[i++] = hdlc->lmi.rxseq;
- if (mode_is(hdlc, MODE_DCE) && fullrep) {
- while (pvc) {
- data[i++] = mode_is(hdlc, MODE_FR_CCITT) ?
- LMI_CCITT_PVCSTAT:LMI_PVCSTAT;
- data[i++] = stat_len;
- if ((hdlc->lmi.state & LINK_STATE_RELIABLE) &&
- (pvc->netdev.flags & IFF_UP) &&
- !(pvc->state & (PVC_STATE_ACTIVE|PVC_STATE_NEW))) {
- pvc->state |= PVC_STATE_NEW;
- fr_log_dlci_active(pvc);
- }
- dlci_to_status(hdlc, netdev_dlci(&pvc->netdev),
- data+i, pvc->state);
- i += stat_len;
- pvc = pvc->next;
- }
- }
- skb_put(skb, i);
- skb->priority = TC_PRIO_CONTROL;
- skb->dev = hdlc_to_dev(hdlc);
- dev_queue_xmit(skb);
- }
- static void fr_timer(unsigned long arg)
- {
- hdlc_device *hdlc = (hdlc_device*)arg;
- int i, cnt = 0, reliable;
- u32 list;
- if (mode_is(hdlc, MODE_DCE))
- reliable = (jiffies - hdlc->lmi.last_poll < hdlc->lmi.T392*HZ);
- else {
- hdlc->lmi.last_errors <<= 1; /* Shift the list */
- if (hdlc->lmi.state & LINK_STATE_REQUEST) {
- printk(KERN_INFO "%s: No LMI status reply receivedn",
- hdlc_to_name(hdlc));
- hdlc->lmi.last_errors |= 1;
- }
- for (i = 0, list = hdlc->lmi.last_errors; i < hdlc->lmi.N393;
- i++, list >>= 1)
- cnt += (list & 1); /* errors count */
- reliable = (cnt < hdlc->lmi.N392);
- }
- if ((hdlc->lmi.state & LINK_STATE_RELIABLE) !=
- (reliable ? LINK_STATE_RELIABLE : 0)) {
- pvc_device *pvc = hdlc->first_pvc;
- while (pvc) {/* Deactivate all PVCs */
- pvc->state &= ~(PVC_STATE_NEW | PVC_STATE_ACTIVE);
- pvc = pvc->next;
- }
- hdlc->lmi.state ^= LINK_STATE_RELIABLE;
- printk(KERN_INFO "%s: Link %sreliablen", hdlc_to_name(hdlc),
- reliable ? "" : "un");
- if (reliable) {
- hdlc->lmi.N391cnt = 0; /* Request full status */
- hdlc->lmi.state |= LINK_STATE_CHANGED;
- }
- }
- if (mode_is(hdlc, MODE_DCE))
- hdlc->timer.expires = jiffies + hdlc->lmi.T392*HZ;
- else {
- if (hdlc->lmi.N391cnt)
- hdlc->lmi.N391cnt--;
- fr_lmi_send(hdlc, hdlc->lmi.N391cnt == 0);
- hdlc->lmi.state |= LINK_STATE_REQUEST;
- hdlc->timer.expires = jiffies + hdlc->lmi.T391*HZ;
- }
- hdlc->timer.function = fr_timer;
- hdlc->timer.data = arg;
- add_timer(&hdlc->timer);
- }
- static int fr_lmi_recv(hdlc_device *hdlc, struct sk_buff *skb)
- {
- int stat_len;
- pvc_device *pvc;
- int reptype = -1, error;
- u8 rxseq, txseq;
- int i;
- if (skb->len < (mode_is(hdlc, MODE_FR_ANSI) ?
- LMI_ANSI_LENGTH : LMI_LENGTH)) {
- printk(KERN_INFO "%s: Short LMI framen", hdlc_to_name(hdlc));
- return 1;
- }
- if (skb->data[5] != (!mode_is(hdlc, MODE_DCE) ?
- LMI_STATUS : LMI_STATUS_ENQUIRY)) {
- printk(KERN_INFO "%s: LMI msgtype=%x, Not LMI status %sn",
- hdlc_to_name(hdlc), skb->data[2],
- mode_is(hdlc, MODE_DCE) ? "enquiry" : "reply");
- return 1;
- }
- i = mode_is(hdlc, MODE_FR_ANSI) ? 7 : 6;
- if (skb->data[i] !=
- (mode_is(hdlc, MODE_FR_CCITT) ? LMI_CCITT_REPTYPE : LMI_REPTYPE)) {
- printk(KERN_INFO "%s: Not a report type=%xn",
- hdlc_to_name(hdlc), skb->data[i]);
- return 1;
- }
- i++;
- i++; /* Skip length field */
- reptype = skb->data[i++];
- if (skb->data[i]!=
- (mode_is(hdlc, MODE_FR_CCITT) ? LMI_CCITT_ALIVE : LMI_ALIVE)) {
- printk(KERN_INFO "%s: Unsupported status element=%xn",
- hdlc_to_name(hdlc), skb->data[i]);
- return 1;
- }
- i++;
- i++; /* Skip length field */
- hdlc->lmi.rxseq = skb->data[i++]; /* TX sequence from peer */
- rxseq = skb->data[i++]; /* Should confirm our sequence */
- txseq = hdlc->lmi.txseq;
- if (mode_is(hdlc, MODE_DCE)) {
- if (reptype != LMI_FULLREP && reptype != LMI_INTEGRITY) {
- printk(KERN_INFO "%s: Unsupported report type=%xn",
- hdlc_to_name(hdlc), reptype);
- return 1;
- }
- }
- error = 0;
- if (!(hdlc->lmi.state & LINK_STATE_RELIABLE))
- error = 1;
- if (rxseq == 0 || rxseq != txseq) {
- hdlc->lmi.N391cnt = 0; /* Ask for full report next time */
- error = 1;
- }
- if (mode_is(hdlc, MODE_DCE)) {
- if ((hdlc->lmi.state & LINK_STATE_FULLREP_SENT) && !error) {
- /* Stop sending full report - the last one has been confirmed by DTE */
- hdlc->lmi.state &= ~LINK_STATE_FULLREP_SENT;
- pvc = hdlc->first_pvc;
- while (pvc) {
- if (pvc->state & PVC_STATE_NEW) {
- pvc->state &= ~PVC_STATE_NEW;
- pvc->state |= PVC_STATE_ACTIVE;
- fr_log_dlci_active(pvc);
- /* Tell DTE that new PVC is now active */
- hdlc->lmi.state |= LINK_STATE_CHANGED;
- }
- pvc = pvc->next;
- }
- }
- if (hdlc->lmi.state & LINK_STATE_CHANGED) {
- reptype = LMI_FULLREP;
- hdlc->lmi.state |= LINK_STATE_FULLREP_SENT;
- hdlc->lmi.state &= ~LINK_STATE_CHANGED;
- }
- fr_lmi_send(hdlc, reptype == LMI_FULLREP ? 1 : 0);
- return 0;
- }
- /* DTE */
- if (reptype != LMI_FULLREP || error)
- return 0;
- stat_len = 3;
- pvc = hdlc->first_pvc;
- while (pvc) {
- pvc->newstate = 0;
- pvc = pvc->next;
- }
- while (skb->len >= i + 2 + stat_len) {
- u16 dlci;
- u8 state = 0;
- if (skb->data[i] != (mode_is(hdlc, MODE_FR_CCITT) ?
- LMI_CCITT_PVCSTAT : LMI_PVCSTAT)) {
- printk(KERN_WARNING "%s: Invalid PVCSTAT ID: %xn",
- hdlc_to_name(hdlc), skb->data[i]);
- return 1;
- }
- i++;
- if (skb->data[i] != stat_len) {
- printk(KERN_WARNING "%s: Invalid PVCSTAT length: %xn",
- hdlc_to_name(hdlc), skb->data[i]);
- return 1;
- }
- i++;
- dlci = status_to_dlci(hdlc, skb->data+i, &state);
- pvc = find_pvc(hdlc, dlci);
- if (pvc)
- pvc->newstate = state;
- else if (state == PVC_STATE_NEW)
- printk(KERN_INFO "%s: new PVC available, DLCI=%un",
- hdlc_to_name(hdlc), dlci);
- i += stat_len;
- }
- pvc = hdlc->first_pvc;
- while (pvc) {
- if (pvc->newstate == PVC_STATE_NEW)
- pvc->newstate = PVC_STATE_ACTIVE;
- pvc->newstate |= (pvc->state &
- ~(PVC_STATE_NEW|PVC_STATE_ACTIVE));
- if (pvc->state != pvc->newstate) {
- pvc->state = pvc->newstate;
- fr_log_dlci_active(pvc);
- }
- pvc = pvc->next;
- }
- /* Next full report after N391 polls */
- hdlc->lmi.N391cnt = hdlc->lmi.N391;
- return 0;
- }
- static void fr_netif(hdlc_device *hdlc, struct sk_buff *skb)
- {
- fr_hdr *fh = (fr_hdr*)skb->data;
- u8 *data = skb->data;
- u16 dlci;
- pvc_device *pvc;
- if (skb->len<4 || fh->ea1 || data[2] != FR_UI)
- goto rx_error;
- dlci = q922_to_dlci(skb->data);
- if (dlci == LMI_DLCI) {
- if (data[3] == LMI_PROTO) {
- if (fr_lmi_recv(hdlc, skb))
- goto rx_error;
- else {
- /* No request pending */
- hdlc->lmi.state &= ~LINK_STATE_REQUEST;
- hdlc->lmi.last_poll = jiffies;
- dev_kfree_skb_any(skb);
- return;
- }
- }
- printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCIn",
- hdlc_to_name(hdlc));
- goto rx_error;
- }
- pvc = find_pvc(hdlc, dlci);
- if (!pvc) {
- #ifdef DEBUG_PKT
- printk(KERN_INFO "%s: No PVC for received frame's DLCI %dn",
- hdlc_to_name(hdlc), dlci);
- #endif
- goto rx_error;
- }
- if ((pvc->netdev.flags & IFF_UP) == 0) {
- #ifdef DEBUG_PKT
- printk(KERN_INFO "%s: PVC for received frame's DLCI %d is downn",
- hdlc_to_name(hdlc), dlci);
- #endif
- goto rx_error;
- }
- pvc->stats.rx_packets++; /* PVC traffic */
- pvc->stats.rx_bytes += skb->len;
- if ((pvc->state & PVC_STATE_FECN) != (fh->fecn ? PVC_STATE_FECN : 0)) {
- #ifdef DEBUG_FECN
- printk(KERN_DEBUG "%s: FECN O%sn", pvc_to_name(pvc),
- fh->fecn ? "N" : "FF");
- #endif
- pvc->state ^= PVC_STATE_FECN;
- }
- if ((pvc->state & PVC_STATE_BECN) != (fh->becn ? PVC_STATE_BECN : 0)) {
- #ifdef DEBUG_FECN
- printk(KERN_DEBUG "%s: BECN O%sn", pvc_to_name(pvc),
- fh->becn ? "N" : "FF");
- #endif
- pvc->state ^= PVC_STATE_BECN;
- }
- if (pvc->state & PVC_STATE_BECN)
- pvc->stats.rx_compressed++;
- if (data[3] == NLPID_IP) {
- skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
- skb->protocol = htons(ETH_P_IP);
- skb->dev = &pvc->netdev;
- netif_rx(skb);
- return;
- }
- if (data[3] == NLPID_IPV6) {
- skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
- skb->protocol = htons(ETH_P_IPV6);
- skb->dev = &pvc->netdev;
- netif_rx(skb);
- return;
- }
- if (data[3] == FR_PAD && data[4] == NLPID_SNAP && data[5] == FR_PAD &&
- data[6] == FR_PAD && data[7] == FR_PAD &&
- ((data[8]<<8) | data[9]) == ETH_P_ARP) {
- skb_pull(skb, 10);
- skb->protocol = htons(ETH_P_ARP);
- skb->dev = &pvc->netdev;
- netif_rx(skb);
- return;
- }
- printk(KERN_INFO "%s: Unusupported protocol %xn",
- hdlc_to_name(hdlc), data[3]);
- dev_kfree_skb_any(skb);
- return;
- rx_error:
- hdlc->stats.rx_errors++; /* Mark error */
- dev_kfree_skb_any(skb);
- }
- static void fr_cisco_open(hdlc_device *hdlc)
- {
- hdlc->lmi.state = LINK_STATE_CHANGED;
- hdlc->lmi.txseq = hdlc->lmi.rxseq = 0;
- hdlc->lmi.last_errors = 0xFFFFFFFF;
- hdlc->lmi.N391cnt = 0;
- init_timer(&hdlc->timer);
- hdlc->timer.expires = jiffies + HZ; /* First poll after 1 second */
- hdlc->timer.function = mode_is(hdlc, MODE_FR) ? fr_timer : cisco_timer;
- hdlc->timer.data = (unsigned long)hdlc;
- add_timer(&hdlc->timer);
- }
- static void fr_cisco_close(hdlc_device *hdlc)
- {
- pvc_device *pvc = hdlc->first_pvc;
- del_timer_sync(&hdlc->timer);
- while(pvc) { /* NULL in Cisco mode */
- dev_close(&pvc->netdev); /* Shutdown all PVCs for this FRAD */
- pvc = pvc->next;
- }
- }
- /******************************************************************
- *
- * generic HDLC routines
- *
- *****************************************************************/
- static int hdlc_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;
- }
- /********************************************************
- *
- * PVC device routines
- *
- *******************************************************/
- static int pvc_open(struct net_device *dev)
- {
- pvc_device *pvc = dev_to_pvc(dev);
- int result = 0;
- if ((hdlc_to_dev(pvc->master)->flags & IFF_UP) == 0)
- return -EIO; /* Master must be UP in order to activate PVC */
- memset(&(pvc->stats), 0, sizeof(struct net_device_stats));
- pvc->state = 0;
- if (!mode_is(pvc->master, MODE_SOFT) && pvc->master->open_pvc)
- result = pvc->master->open_pvc(pvc);
- if (result)
- return result;
- pvc->master->lmi.state |= LINK_STATE_CHANGED;
- return 0;
- }
- static int pvc_close(struct net_device *dev)
- {
- pvc_device *pvc = dev_to_pvc(dev);
- pvc->state = 0;
- if (!mode_is(pvc->master, MODE_SOFT) && pvc->master->close_pvc)
- pvc->master->close_pvc(pvc);
- pvc->master->lmi.state |= LINK_STATE_CHANGED;
- return 0;
- }
- static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
- {
- pvc_device *pvc = dev_to_pvc(dev);
- if (pvc->state & PVC_STATE_ACTIVE) {
- skb->dev = hdlc_to_dev(pvc->master);
- pvc->stats.tx_bytes += skb->len;
- pvc->stats.tx_packets++;
- if (pvc->state & PVC_STATE_FECN)
- pvc->stats.tx_compressed++; /* TX Congestion counter */
- dev_queue_xmit(skb);
- } else {
- pvc->stats.tx_dropped++;
- dev_kfree_skb(skb);
- }
- return 0;
- }
- static struct net_device_stats *pvc_get_stats(struct net_device *dev)
- {
- pvc_device *pvc = dev_to_pvc(dev);
- return &pvc->stats;
- }
- 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 void destroy_pvc_list(hdlc_device *hdlc)
- {
- pvc_device *pvc = hdlc->first_pvc;
- while(pvc) {
- pvc_device *next = pvc->next;
- unregister_netdevice(&pvc->netdev);
- kfree(pvc);
- pvc = next;
- }
- hdlc->first_pvc = NULL; /* All PVCs destroyed */
- hdlc->pvc_count = 0;
- hdlc->lmi.state |= LINK_STATE_CHANGED;
- }
- /********************************************************
- *
- * X.25 protocol support routines
- *
- *******************************************************/
- #ifdef CONFIG_HDLC_X25
- /* These functions are callbacks called by LAPB layer */
- void x25_connect_disconnect(void *token, int reason, int code)
- {
- hdlc_device *hdlc = token;
- struct sk_buff *skb;
- unsigned char *ptr;
- if ((skb = dev_alloc_skb(1)) == NULL) {
- printk(KERN_ERR "%s: out of memoryn", hdlc_to_name(hdlc));
- return;
- }
- ptr = skb_put(skb, 1);
- *ptr = code;
- skb->dev = hdlc_to_dev(hdlc);
- skb->protocol = htons(ETH_P_X25);
- skb->mac.raw = skb->data;
- skb->pkt_type = PACKET_HOST;
- netif_rx(skb);
- }
- void x25_connected(void *token, int reason)
- {
- x25_connect_disconnect(token, reason, 1);
- }
- void x25_disconnected(void *token, int reason)
- {
- x25_connect_disconnect(token, reason, 2);
- }
- int x25_data_indication(void *token, struct sk_buff *skb)
- {
- hdlc_device *hdlc = token;
- unsigned char *ptr;
- ptr = skb_push(skb, 1);
- *ptr = 0;
- skb->dev = hdlc_to_dev(hdlc);
- skb->protocol = htons(ETH_P_X25);
- skb->mac.raw = skb->data;
- skb->pkt_type = PACKET_HOST;
- return netif_rx(skb);
- }
- void x25_data_transmit(void *token, struct sk_buff *skb)
- {
- hdlc_device *hdlc = token;
- hdlc->xmit(hdlc, skb); /* Ignore return value :-( */
- }
- #endif /* CONFIG_HDLC_X25 */
- /********************************************************
- *
- * HDLC device routines
- *
- *******************************************************/
- static int hdlc_open(struct net_device *dev)
- {
- hdlc_device *hdlc = dev_to_hdlc(dev);
- int result;
- if (hdlc->mode == MODE_NONE)
- return -ENOSYS;
- memset(&(hdlc->stats), 0, sizeof(struct net_device_stats));
- if (mode_is(hdlc, MODE_FR | MODE_SOFT) ||
- mode_is(hdlc, MODE_CISCO | MODE_SOFT))
- fr_cisco_open(hdlc);
- #ifdef CONFIG_HDLC_PPP
- else if (mode_is(hdlc, MODE_PPP | MODE_SOFT)) {
- sppp_attach(&hdlc->pppdev);
- /* sppp_attach nukes them. We don't need syncppp's ioctl */
- dev->do_ioctl = hdlc_ioctl;
- hdlc->pppdev.sppp.pp_flags &= ~PP_CISCO;
- dev->type = ARPHRD_PPP;
- result = sppp_open(dev);
- if (result) {
- sppp_detach(dev);
- return result;
- }
- }
- #endif
- #ifdef CONFIG_HDLC_X25
- else if (mode_is(hdlc, MODE_X25)) {
- struct lapb_register_struct cb;
- cb.connect_confirmation = x25_connected;
- cb.connect_indication = x25_connected;
- cb.disconnect_confirmation = x25_disconnected;
- cb.disconnect_indication = x25_disconnected;
- cb.data_indication = x25_data_indication;
- cb.data_transmit = x25_data_transmit;
- result = lapb_register(hdlc, &cb);
- if (result != LAPB_OK)
- return result;
- }
- #endif
- result = hdlc->open(hdlc);
- if (result) {
- if (mode_is(hdlc, MODE_FR | MODE_SOFT) ||
- mode_is(hdlc, MODE_CISCO | MODE_SOFT))
- fr_cisco_close(hdlc);
- #ifdef CONFIG_HDLC_PPP
- else if (mode_is(hdlc, MODE_PPP | MODE_SOFT)) {
- sppp_close(dev);
- sppp_detach(dev);
- dev->rebuild_header = NULL;
- dev->change_mtu = hdlc_change_mtu;
- dev->mtu = HDLC_MAX_MTU;
- dev->hard_header_len = 16;
- }
- #endif
- #ifdef CONFIG_HDLC_X25
- else if (mode_is(hdlc, MODE_X25))
- lapb_unregister(hdlc);
- #endif
- }
- return result;
- }
- static int hdlc_close(struct net_device *dev)
- {
- hdlc_device *hdlc = dev_to_hdlc(dev);
- hdlc->close(hdlc);
- if (mode_is(hdlc, MODE_FR | MODE_SOFT) ||
- mode_is(hdlc, MODE_CISCO | MODE_SOFT))
- fr_cisco_close(hdlc);
- #ifdef CONFIG_HDLC_PPP
- else if (mode_is(hdlc, MODE_PPP | MODE_SOFT)) {
- sppp_close(dev);
- sppp_detach(dev);
- dev->rebuild_header = NULL;
- dev->change_mtu = hdlc_change_mtu;
- dev->mtu = HDLC_MAX_MTU;
- dev->hard_header_len = 16;
- }
- #endif
- #ifdef CONFIG_HDLC_X25
- else if (mode_is(hdlc, MODE_X25))
- lapb_unregister(hdlc);
- #endif
- return 0;
- }
- static int hdlc_xmit(struct sk_buff *skb, struct net_device *dev)
- {
- hdlc_device *hdlc = dev_to_hdlc(dev);
- #ifdef CONFIG_HDLC_X25
- if (mode_is(hdlc, MODE_X25 | MODE_SOFT)) {
- int result;
- /* X.25 to LAPB */
- switch (skb->data[0]) {
- case 0: /* Data to be transmitted */
- skb_pull(skb, 1);
- if ((result = lapb_data_request(hdlc, skb)) != LAPB_OK)
- dev_kfree_skb(skb);
- return 0;
- case 1:
- if ((result = lapb_connect_request(hdlc))!= LAPB_OK) {
- if (result == LAPB_CONNECTED) {
- /* Send connect confirm. msg to level 3 */
- x25_connected(hdlc, 0);
- } else {
- printk(KERN_ERR "%s: LAPB connect "
- "request failed, error code = "
- "%in", hdlc_to_name(hdlc),
- result);
- }
- }
- break;
- case 2:
- if ((result=lapb_disconnect_request(hdlc))!=LAPB_OK) {
- if (result == LAPB_NOTCONNECTED) {
- /* Send disconnect confirm. msg to level 3 */
- x25_disconnected(hdlc, 0);
- } else {
- printk(KERN_ERR "%s: LAPB disconnect "
- "request failed, error code = "
- "%in", hdlc_to_name(hdlc),
- result);
- }
- }
- break;
- default:
- /* to be defined */
- break;
- }
- dev_kfree_skb(skb);
- return 0;
- } /* MODE_X25 */
- #endif /* CONFIG_HDLC_X25 */
- return hdlc->xmit(hdlc, skb);
- }
- void hdlc_netif_rx(hdlc_device *hdlc, struct sk_buff *skb)
- {
- /* skb contains raw HDLC frame, in both hard- and software modes */
- skb->mac.raw = skb->data;
- switch(hdlc->mode & MODE_MASK) {
- case MODE_HDLC:
- skb->protocol = htons(ETH_P_IP);
- skb->dev = hdlc_to_dev(hdlc);
- netif_rx(skb);
- return;
- case MODE_FR:
- fr_netif(hdlc, skb);
- return;
- case MODE_CISCO:
- cisco_netif(hdlc, skb);
- return;
- #ifdef CONFIG_HDLC_PPP
- case MODE_PPP:
- #if 0
- sppp_input(hdlc_to_dev(hdlc), skb);
- #else
- skb->protocol = htons(ETH_P_WAN_PPP);
- skb->dev = hdlc_to_dev(hdlc);
- netif_rx(skb);
- #endif
- return;
- #endif
- #ifdef CONFIG_HDLC_X25
- case MODE_X25:
- skb->dev = hdlc_to_dev(hdlc);
- if (lapb_data_received(hdlc, skb) == LAPB_OK)
- return;
- break;
- #endif
- }
- hdlc->stats.rx_errors++;
- dev_kfree_skb_any(skb);
- }
- static struct net_device_stats *hdlc_get_stats(struct net_device *dev)
- {
- return &dev_to_hdlc(dev)->stats;
- }
- static int hdlc_set_mode(hdlc_device *hdlc, int mode)
- {
- int result = -1; /* Default to soft modes */
- struct net_device *dev = hdlc_to_dev(hdlc);
- if(!capable(CAP_NET_ADMIN))
- return -EPERM;
- if(dev->flags & IFF_UP)
- return -EBUSY;
- dev->addr_len = 0;
- dev->hard_header = NULL;
- hdlc->mode = MODE_NONE;
- if (!(mode & MODE_SOFT))
- switch(mode & MODE_MASK) {
- case MODE_HDLC:
- result = hdlc->set_mode ?
- hdlc->set_mode(hdlc, MODE_HDLC) : 0;
- break;
- case MODE_CISCO: /* By card */
- #ifdef CONFIG_HDLC_PPP
- case MODE_PPP:
- #endif
- #ifdef CONFIG_HDLC_X25
- case MODE_X25:
- #endif
- case MODE_FR:
- result = hdlc->set_mode ?
- hdlc->set_mode(hdlc, mode) : -ENOSYS;
- break;
- default:
- return -EINVAL;
- }
- if (result) {
- mode |= MODE_SOFT; /* Try "host software" protocol */
- switch(mode & MODE_MASK) {
- case MODE_CISCO:
- dev->hard_header = cisco_hard_header;
- break;
- #ifdef CONFIG_HDLC_PPP
- case MODE_PPP:
- break;
- #endif
- #ifdef CONFIG_HDLC_X25
- case MODE_X25:
- break;
- #endif
- case MODE_FR:
- dev->hard_header = fr_hard_header;
- dev->addr_len = 2;
- *(u16*)dev->dev_addr = htons(LMI_DLCI);
- dlci_to_q922(dev->broadcast, LMI_DLCI);
- break;
- default:
- return -EINVAL;
- }
- result = hdlc->set_mode ?
- hdlc->set_mode(hdlc, MODE_HDLC) : 0;
- }
- if (result)
- return result;
- hdlc->mode = mode;
- switch(mode & MODE_MASK) {
- #ifdef CONFIG_HDLC_PPP
- case MODE_PPP: dev->type = ARPHRD_PPP; break;
- #endif
- #ifdef CONFIG_HDLC_X25
- case MODE_X25: dev->type = ARPHRD_X25; break;
- #endif
- case MODE_FR: dev->type = ARPHRD_FRAD; break;
- case MODE_CISCO: dev->type = ARPHRD_CISCO; break;
- default: dev->type = ARPHRD_RAWHDLC;
- }
- memset(&(hdlc->stats), 0, sizeof(struct net_device_stats));
- destroy_pvc_list(hdlc);
- return 0;
- }
- static int hdlc_fr_pvc(hdlc_device *hdlc, int dlci)
- {
- pvc_device **pvc_p = &hdlc->first_pvc;
- pvc_device *pvc;
- int result, create = 1; /* Create or delete PVC */
- if(!capable(CAP_NET_ADMIN))
- return -EPERM;
- if(dlci<0) {
- dlci = -dlci;
- create = 0;
- }
- if(dlci <= 0 || dlci >= 1024)
- return -EINVAL; /* Only 10 bits for DLCI, DLCI=0 is reserved */
- if(!mode_is(hdlc, MODE_FR))
- return -EINVAL; /* Only meaningfull on FR */
- while(*pvc_p) {
- if (netdev_dlci(&(*pvc_p)->netdev) == dlci)
- break;
- pvc_p = &(*pvc_p)->next;
- }
- if (create) { /* Create PVC */
- if (*pvc_p != NULL)
- return -EEXIST;
- pvc = *pvc_p = kmalloc(sizeof(pvc_device), GFP_KERNEL);
- if (!pvc) {
- printk(KERN_WARNING "%s: Memory squeeze on "
- "hdlc_fr_pvc()n", hdlc_to_name(hdlc));
- return -ENOBUFS;
- }
- memset(pvc, 0, sizeof(pvc_device));
- pvc->netdev.hard_start_xmit = pvc_xmit;
- pvc->netdev.get_stats = pvc_get_stats;
- pvc->netdev.open = pvc_open;
- pvc->netdev.stop = pvc_close;
- pvc->netdev.change_mtu = pvc_change_mtu;
- pvc->netdev.mtu = HDLC_MAX_MTU;
- pvc->netdev.type = ARPHRD_DLCI;
- pvc->netdev.hard_header_len = 16;
- pvc->netdev.hard_header = fr_hard_header;
- pvc->netdev.tx_queue_len = 0;
- pvc->netdev.flags = IFF_POINTOPOINT;
- pvc->master = hdlc;
- *(u16*)pvc->netdev.dev_addr = htons(dlci);
- dlci_to_q922(pvc->netdev.broadcast, dlci);
- pvc->netdev.addr_len = 2;
- pvc->netdev.irq = hdlc_to_dev(hdlc)->irq;
- result = dev_alloc_name(&pvc->netdev, "pvc%d");
- if (result < 0) {
- kfree(pvc);
- *pvc_p = NULL;
- return result;
- }
- if (register_netdevice(&pvc->netdev) != 0) {
- kfree(pvc);
- *pvc_p = NULL;
- return -EIO;
- }
- if (!mode_is(hdlc, MODE_SOFT) && hdlc->create_pvc) {
- result = hdlc->create_pvc(pvc);
- if (result) {
- unregister_netdevice(&pvc->netdev);
- kfree(pvc);
- *pvc_p = NULL;
- return result;
- }
- }
- hdlc->lmi.state |= LINK_STATE_CHANGED;
- hdlc->pvc_count++;
- return 0;
- }
- if (*pvc_p == NULL) /* Delete PVC */
- return -ENOENT;
- pvc = *pvc_p;
- if (pvc->netdev.flags & IFF_UP)
- return -EBUSY; /* PVC in use */
- if (!mode_is(hdlc, MODE_SOFT) && hdlc->destroy_pvc)
- hdlc->destroy_pvc(pvc);
- hdlc->lmi.state |= LINK_STATE_CHANGED;
- hdlc->pvc_count--;
- *pvc_p = pvc->next;
- unregister_netdevice(&pvc->netdev);
- kfree(pvc);
- return 0;
- }
- static int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
- {
- hdlc_device *hdlc = dev_to_hdlc(dev);
- switch(cmd) {
- case HDLCGMODE:
- ifr->ifr_ifru.ifru_ivalue = hdlc->mode;
- return 0;
- case HDLCSMODE:
- return hdlc_set_mode(hdlc, ifr->ifr_ifru.ifru_ivalue);
- case HDLCPVC:
- return hdlc_fr_pvc(hdlc, ifr->ifr_ifru.ifru_ivalue);
- default:
- if (hdlc->ioctl != NULL)
- return hdlc->ioctl(hdlc, ifr, cmd);
- }
- return -EINVAL;
- }
- static int hdlc_init(struct net_device *dev)
- {
- hdlc_device *hdlc = dev_to_hdlc(dev);
- memset(&(hdlc->stats), 0, sizeof(struct net_device_stats));
- dev->get_stats = hdlc_get_stats;
- dev->open = hdlc_open;
- dev->stop = hdlc_close;
- dev->hard_start_xmit = hdlc_xmit;
- dev->do_ioctl = hdlc_ioctl;
- dev->change_mtu = hdlc_change_mtu;
- dev->mtu = HDLC_MAX_MTU;
- dev->type = ARPHRD_RAWHDLC;
- dev->hard_header_len = 16;
- dev->flags = IFF_POINTOPOINT | IFF_NOARP;
- return 0;
- }
- int register_hdlc_device(hdlc_device *hdlc)
- {
- int result;
- struct net_device *dev = hdlc_to_dev(hdlc);
- dev->init = hdlc_init;
- dev->priv = &hdlc->syncppp_ptr;
- hdlc->syncppp_ptr = &hdlc->pppdev;
- hdlc->pppdev.dev = dev;
- hdlc->mode = MODE_NONE;
- hdlc->lmi.T391 = 10; /* polling verification timer */
- hdlc->lmi.T392 = 15; /* link integrity verification polling timer */
- hdlc->lmi.N391 = 6; /* full status polling counter */
- hdlc->lmi.N392 = 3; /* error threshold */
- hdlc->lmi.N393 = 4; /* monitored events count */
- result = dev_alloc_name(dev, "hdlc%d");
- if (result<0)
- return result;
- result = register_netdev(dev);
- if (result != 0)
- return -EIO;
- MOD_INC_USE_COUNT;
- return 0;
- }
- void unregister_hdlc_device(hdlc_device *hdlc)
- {
- destroy_pvc_list(hdlc);
- unregister_netdev(hdlc_to_dev(hdlc));
- MOD_DEC_USE_COUNT;
- }
- MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
- MODULE_DESCRIPTION("HDLC support module");
- MODULE_LICENSE("GPL");
- EXPORT_SYMBOL(hdlc_netif_rx);
- EXPORT_SYMBOL(register_hdlc_device);
- EXPORT_SYMBOL(unregister_hdlc_device);
- static int __init hdlc_module_init(void)
- {
- printk(KERN_INFO "%sn", version);
- return 0;
- }
- module_init(hdlc_module_init);