diff options
Diffstat (limited to 'drivers/net/wan/syncppp.c')
| -rw-r--r-- | drivers/net/wan/syncppp.c | 1488 |
1 files changed, 1488 insertions, 0 deletions
diff --git a/drivers/net/wan/syncppp.c b/drivers/net/wan/syncppp.c new file mode 100644 index 00000000000..84b65c60c79 --- /dev/null +++ b/drivers/net/wan/syncppp.c @@ -0,0 +1,1488 @@ +/* + * NET3: A (fairly minimal) implementation of synchronous PPP for Linux + * as well as a CISCO HDLC implementation. See the copyright + * message below for the original source. + * + * 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. + * + * Note however. This code is also used in a different form by FreeBSD. + * Therefore when making any non OS specific change please consider + * contributing it back to the original author under the terms + * below in addition. + * -- Alan + * + * Port for Linux-2.1 by Jan "Yenya" Kasprzak <kas@fi.muni.cz> + */ + +/* + * Synchronous PPP/Cisco link level subroutines. + * Keepalive protocol implemented in both Cisco and PPP modes. + * + * Copyright (C) 1994 Cronyx Ltd. + * Author: Serge Vakulenko, <vak@zebub.msk.su> + * + * This software is distributed with NO WARRANTIES, not even the implied + * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + * Authors grant any other persons or organisations permission to use + * or modify this software as long as this message is kept with the software, + * all derivative works or modified versions. + * + * Version 1.9, Wed Oct 4 18:58:15 MSK 1995 + * + * $Id: syncppp.c,v 1.18 2000/04/11 05:25:31 asj Exp $ + */ +#undef DEBUG + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/if_arp.h> +#include <linux/skbuff.h> +#include <linux/route.h> +#include <linux/netdevice.h> +#include <linux/inetdevice.h> +#include <linux/random.h> +#include <linux/pkt_sched.h> +#include <linux/spinlock.h> +#include <linux/rcupdate.h> + +#include <net/syncppp.h> + +#include <asm/byteorder.h> +#include <asm/uaccess.h> + +#define MAXALIVECNT 6 /* max. alive packets */ + +#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */ +#define PPP_UI 0x03 /* Unnumbered Information */ +#define PPP_IP 0x0021 /* Internet Protocol */ +#define PPP_ISO 0x0023 /* ISO OSI Protocol */ +#define PPP_XNS 0x0025 /* Xerox NS Protocol */ +#define PPP_IPX 0x002b /* Novell IPX Protocol */ +#define PPP_LCP 0xc021 /* Link Control Protocol */ +#define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */ + +#define LCP_CONF_REQ 1 /* PPP LCP configure request */ +#define LCP_CONF_ACK 2 /* PPP LCP configure acknowledge */ +#define LCP_CONF_NAK 3 /* PPP LCP configure negative ack */ +#define LCP_CONF_REJ 4 /* PPP LCP configure reject */ +#define LCP_TERM_REQ 5 /* PPP LCP terminate request */ +#define LCP_TERM_ACK 6 /* PPP LCP terminate acknowledge */ +#define LCP_CODE_REJ 7 /* PPP LCP code reject */ +#define LCP_PROTO_REJ 8 /* PPP LCP protocol reject */ +#define LCP_ECHO_REQ 9 /* PPP LCP echo request */ +#define LCP_ECHO_REPLY 10 /* PPP LCP echo reply */ +#define LCP_DISC_REQ 11 /* PPP LCP discard request */ + +#define LCP_OPT_MRU 1 /* maximum receive unit */ +#define LCP_OPT_ASYNC_MAP 2 /* async control character map */ +#define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ +#define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ +#define LCP_OPT_MAGIC 5 /* magic number */ +#define LCP_OPT_RESERVED 6 /* reserved */ +#define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ +#define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ + +#define IPCP_CONF_REQ LCP_CONF_REQ /* PPP IPCP configure request */ +#define IPCP_CONF_ACK LCP_CONF_ACK /* PPP IPCP configure acknowledge */ +#define IPCP_CONF_NAK LCP_CONF_NAK /* PPP IPCP configure negative ack */ +#define IPCP_CONF_REJ LCP_CONF_REJ /* PPP IPCP configure reject */ +#define IPCP_TERM_REQ LCP_TERM_REQ /* PPP IPCP terminate request */ +#define IPCP_TERM_ACK LCP_TERM_ACK /* PPP IPCP terminate acknowledge */ +#define IPCP_CODE_REJ LCP_CODE_REJ /* PPP IPCP code reject */ + +#define CISCO_MULTICAST 0x8f /* Cisco multicast address */ +#define CISCO_UNICAST 0x0f /* Cisco unicast address */ +#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ +#define CISCO_ADDR_REQ 0 /* Cisco address request */ +#define CISCO_ADDR_REPLY 1 /* Cisco address reply */ +#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ + +struct ppp_header { + u8 address; + u8 control; + u16 protocol; +}; +#define PPP_HEADER_LEN sizeof (struct ppp_header) + +struct lcp_header { + u8 type; + u8 ident; + u16 len; +}; +#define LCP_HEADER_LEN sizeof (struct lcp_header) + +struct cisco_packet { + u32 type; + u32 par1; + u32 par2; + u16 rel; + u16 time0; + u16 time1; +}; +#define CISCO_PACKET_LEN 18 +#define CISCO_BIG_PACKET_LEN 20 + +static struct sppp *spppq; +static struct timer_list sppp_keepalive_timer; +static DEFINE_SPINLOCK(spppq_lock); + +/* global xmit queue for sending packets while spinlock is held */ +static struct sk_buff_head tx_queue; + +static void sppp_keepalive (unsigned long dummy); +static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type, + u8 ident, u16 len, void *data); +static void sppp_cisco_send (struct sppp *sp, int type, long par1, long par2); +static void sppp_lcp_input (struct sppp *sp, struct sk_buff *m); +static void sppp_cisco_input (struct sppp *sp, struct sk_buff *m); +static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *m); +static void sppp_lcp_open (struct sppp *sp); +static void sppp_ipcp_open (struct sppp *sp); +static int sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h, + int len, u32 *magic); +static void sppp_cp_timeout (unsigned long arg); +static char *sppp_lcp_type_name (u8 type); +static char *sppp_ipcp_type_name (u8 type); +static void sppp_print_bytes (u8 *p, u16 len); + +static int debug; + +/* Flush global outgoing packet queue to dev_queue_xmit(). + * + * dev_queue_xmit() must be called with interrupts enabled + * which means it can't be called with spinlocks held. + * If a packet needs to be sent while a spinlock is held, + * then put the packet into tx_queue, and call sppp_flush_xmit() + * after spinlock is released. + */ +static void sppp_flush_xmit(void) +{ + struct sk_buff *skb; + while ((skb = skb_dequeue(&tx_queue)) != NULL) + dev_queue_xmit(skb); +} + +/* + * Interface down stub + */ + +static void if_down(struct net_device *dev) +{ + struct sppp *sp = (struct sppp *)sppp_of(dev); + + sp->pp_link_state=SPPP_LINK_DOWN; +} + +/* + * Timeout routine activations. + */ + +static void sppp_set_timeout(struct sppp *p,int s) +{ + if (! (p->pp_flags & PP_TIMO)) + { + init_timer(&p->pp_timer); + p->pp_timer.function=sppp_cp_timeout; + p->pp_timer.expires=jiffies+s*HZ; + p->pp_timer.data=(unsigned long)p; + p->pp_flags |= PP_TIMO; + add_timer(&p->pp_timer); + } +} + +static void sppp_clear_timeout(struct sppp *p) +{ + if (p->pp_flags & PP_TIMO) + { + del_timer(&p->pp_timer); + p->pp_flags &= ~PP_TIMO; + } +} + +/** + * sppp_input - receive and process a WAN PPP frame + * @skb: The buffer to process + * @dev: The device it arrived on + * + * This can be called directly by cards that do not have + * timing constraints but is normally called from the network layer + * after interrupt servicing to process frames queued via netif_rx(). + * + * We process the options in the card. If the frame is destined for + * the protocol stacks then it requeues the frame for the upper level + * protocol. If it is a control from it is processed and discarded + * here. + */ + +void sppp_input (struct net_device *dev, struct sk_buff *skb) +{ + struct ppp_header *h; + struct sppp *sp = (struct sppp *)sppp_of(dev); + unsigned long flags; + + skb->dev=dev; + skb->mac.raw=skb->data; + + if (dev->flags & IFF_RUNNING) + { + /* Count received bytes, add FCS and one flag */ + sp->ibytes+= skb->len + 3; + sp->ipkts++; + } + + if (!pskb_may_pull(skb, PPP_HEADER_LEN)) { + /* Too small packet, drop it. */ + if (sp->pp_flags & PP_DEBUG) + printk (KERN_DEBUG "%s: input packet is too small, %d bytes\n", + dev->name, skb->len); + kfree_skb(skb); + return; + } + + /* Get PPP header. */ + h = (struct ppp_header *)skb->data; + skb_pull(skb,sizeof(struct ppp_header)); + + spin_lock_irqsave(&sp->lock, flags); + + switch (h->address) { + default: /* Invalid PPP packet. */ + goto invalid; + case PPP_ALLSTATIONS: + if (h->control != PPP_UI) + goto invalid; + if (sp->pp_flags & PP_CISCO) { + if (sp->pp_flags & PP_DEBUG) + printk (KERN_WARNING "%s: PPP packet in Cisco mode <0x%x 0x%x 0x%x>\n", + dev->name, + h->address, h->control, ntohs (h->protocol)); + goto drop; + } + switch (ntohs (h->protocol)) { + default: + if (sp->lcp.state == LCP_STATE_OPENED) + sppp_cp_send (sp, PPP_LCP, LCP_PROTO_REJ, + ++sp->pp_seq, skb->len + 2, + &h->protocol); + if (sp->pp_flags & PP_DEBUG) + printk (KERN_WARNING "%s: invalid input protocol <0x%x 0x%x 0x%x>\n", + dev->name, + h->address, h->control, ntohs (h->protocol)); + goto drop; + case PPP_LCP: + sppp_lcp_input (sp, skb); + goto drop; + case PPP_IPCP: + if (sp->lcp.state == LCP_STATE_OPENED) + sppp_ipcp_input (sp, skb); + else + printk(KERN_DEBUG "IPCP when still waiting LCP finish.\n"); + goto drop; + case PPP_IP: + if (sp->ipcp.state == IPCP_STATE_OPENED) { + if(sp->pp_flags&PP_DEBUG) + printk(KERN_DEBUG "Yow an IP frame.\n"); + skb->protocol=htons(ETH_P_IP); + netif_rx(skb); + dev->last_rx = jiffies; + goto done; + } + break; +#ifdef IPX + case PPP_IPX: + /* IPX IPXCP not implemented yet */ + if (sp->lcp.state == LCP_STATE_OPENED) { + skb->protocol=htons(ETH_P_IPX); + netif_rx(skb); + dev->last_rx = jiffies; + goto done; + } + break; +#endif + } + break; + case CISCO_MULTICAST: + case CISCO_UNICAST: + /* Don't check the control field here (RFC 1547). */ + if (! (sp->pp_flags & PP_CISCO)) { + if (sp->pp_flags & PP_DEBUG) + printk (KERN_WARNING "%s: Cisco packet in PPP mode <0x%x 0x%x 0x%x>\n", + dev->name, + h->address, h->control, ntohs (h->protocol)); + goto drop; + } + switch (ntohs (h->protocol)) { + default: + goto invalid; + case CISCO_KEEPALIVE: + sppp_cisco_input (sp, skb); + goto drop; +#ifdef CONFIG_INET + case ETH_P_IP: + skb->protocol=htons(ETH_P_IP); + netif_rx(skb); + dev->last_rx = jiffies; + goto done; +#endif +#ifdef CONFIG_IPX + case ETH_P_IPX: + skb->protocol=htons(ETH_P_IPX); + netif_rx(skb); + dev->last_rx = jiffies; + goto done; +#endif + } + break; + } + goto drop; + +invalid: + if (sp->pp_flags & PP_DEBUG) + printk (KERN_WARNING "%s: invalid input packet <0x%x 0x%x 0x%x>\n", + dev->name, h->address, h->control, ntohs (h->protocol)); +drop: + kfree_skb(skb); +done: + spin_unlock_irqrestore(&sp->lock, flags); + sppp_flush_xmit(); + return; +} + +EXPORT_SYMBOL(sppp_input); + +/* + * Handle transmit packets. + */ + +static int sppp_hard_header(struct sk_buff *skb, struct net_device *dev, __u16 type, + void *daddr, void *saddr, unsigned int len) +{ + struct sppp *sp = (struct sppp *)sppp_of(dev); + struct ppp_header *h; + skb_push(skb,sizeof(struct ppp_header)); + h=(struct ppp_header *)skb->data; + if(sp->pp_flags&PP_CISCO) + { + h->address = CISCO_UNICAST; + h->control = 0; + } + else + { + h->address = PPP_ALLSTATIONS; + h->control = PPP_UI; + } + if(sp->pp_flags & PP_CISCO) + { + h->protocol = htons(type); + } + else switch(type) + { + case ETH_P_IP: + h->protocol = htons(PPP_IP); + break; + case ETH_P_IPX: + h->protocol = htons(PPP_IPX); + break; + } + return sizeof(struct ppp_header); +} + +static int sppp_rebuild_header(struct sk_buff *skb) +{ + return 0; +} + +/* + * Send keepalive packets, every 10 seconds. + */ + +static void sppp_keepalive (unsigned long dummy) +{ + struct sppp *sp; + unsigned long flags; + + spin_lock_irqsave(&spppq_lock, flags); + + for (sp=spppq; sp; sp=sp->pp_next) + { + struct net_device *dev = sp->pp_if; + + /* Keepalive mode disabled or channel down? */ + if (! (sp->pp_flags & PP_KEEPALIVE) || + ! (dev->flags & IFF_UP)) + continue; + + spin_lock(&sp->lock); + + /* No keepalive in PPP mode if LCP not opened yet. */ + if (! (sp->pp_flags & PP_CISCO) && + sp->lcp.state != LCP_STATE_OPENED) { + spin_unlock(&sp->lock); + continue; + } + + if (sp->pp_alivecnt == MAXALIVECNT) { + /* No keepalive packets got. Stop the interface. */ + printk (KERN_WARNING "%s: protocol down\n", dev->name); + if_down (dev); + if (! (sp->pp_flags & PP_CISCO)) { + /* Shut down the PPP link. */ + sp->lcp.magic = jiffies; + sp->lcp.state = LCP_STATE_CLOSED; + sp->ipcp.state = IPCP_STATE_CLOSED; + sppp_clear_timeout (sp); + /* Initiate negotiation. */ + sppp_lcp_open (sp); + } + } + if (sp->pp_alivecnt <= MAXALIVECNT) + ++sp->pp_alivecnt; + if (sp->pp_flags & PP_CISCO) + sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, ++sp->pp_seq, + sp->pp_rseq); + else if (sp->lcp.state == LCP_STATE_OPENED) { + long nmagic = htonl (sp->lcp.magic); + sp->lcp.echoid = ++sp->pp_seq; + sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REQ, + sp->lcp.echoid, 4, &nmagic); + } + + spin_unlock(&sp->lock); + } + spin_unlock_irqrestore(&spppq_lock, flags); + sppp_flush_xmit(); + sppp_keepalive_timer.expires=jiffies+10*HZ; + add_timer(&sppp_keepalive_timer); +} + +/* + * Handle incoming PPP Link Control Protocol packets. + */ + +static void sppp_lcp_input (struct sppp *sp, struct sk_buff *skb) +{ + struct lcp_header *h; + struct net_device *dev = sp->pp_if; + int len = skb->len; + u8 *p, opt[6]; + u32 rmagic; + + if (!pskb_may_pull(skb, sizeof(struct lcp_header))) { + if (sp->pp_flags & PP_DEBUG) + printk (KERN_WARNING "%s: invalid lcp packet length: %d bytes\n", + dev->name, len); + return; + } + h = (struct lcp_header *)skb->data; + skb_pull(skb,sizeof(struct lcp_header *)); + + if (sp->pp_flags & PP_DEBUG) + { + char state = '?'; + switch (sp->lcp.state) { + case LCP_STATE_CLOSED: state = 'C'; break; + case LCP_STATE_ACK_RCVD: state = 'R'; break; + case LCP_STATE_ACK_SENT: state = 'S'; break; + case LCP_STATE_OPENED: state = 'O'; break; + } + printk (KERN_WARNING "%s: lcp input(%c): %d bytes <%s id=%xh len=%xh", + dev->name, state, len, + sppp_lcp_type_name (h->type), h->ident, ntohs (h->len)); + if (len > 4) + sppp_print_bytes ((u8*) (h+1), len-4); + printk (">\n"); + } + if (len > ntohs (h->len)) + len = ntohs (h->len); + switch (h->type) { + default: + /* Unknown packet type -- send Code-Reject packet. */ + sppp_cp_send (sp, PPP_LCP, LCP_CODE_REJ, ++sp->pp_seq, + skb->len, h); + break; + case LCP_CONF_REQ: + if (len < 4) { + if (sp->pp_flags & PP_DEBUG) + printk (KERN_DEBUG"%s: invalid lcp configure request packet length: %d bytes\n", + dev->name, len); + break; + } + if (len>4 && !sppp_lcp_conf_parse_options (sp, h, len, &rmagic)) + goto badreq; + if (rmagic == sp->lcp.magic) { + /* Local and remote magics equal -- loopback? */ + if (sp->pp_loopcnt >= MAXALIVECNT*5) { + printk (KERN_WARNING "%s: loopback\n", + dev->name); + sp->pp_loopcnt = 0; + if (dev->flags & IFF_UP) { + if_down (dev); + } + } else if (sp->pp_flags & PP_DEBUG) + printk (KERN_DEBUG "%s: conf req: magic glitch\n", + dev->name); + ++sp->pp_loopcnt; + + /* MUST send Conf-Nack packet. */ + rmagic = ~sp->lcp.magic; + opt[0] = LCP_OPT_MAGIC; + opt[1] = sizeof (opt); + opt[2] = rmagic >> 24; + opt[3] = rmagic >> 16; + opt[4] = rmagic >> 8; + opt[5] = rmagic; + sppp_cp_send (sp, PPP_LCP, LCP_CONF_NAK, + h->ident, sizeof (opt), &opt); +badreq: + switch (sp->lcp.state) { + case LCP_STATE_OPENED: + /* Initiate renegotiation. */ + sppp_lcp_open (sp); + /* fall through... */ + case LCP_STATE_ACK_SENT: + /* Go to closed state. */ + sp->lcp.state = LCP_STATE_CLOSED; + sp->ipcp.state = IPCP_STATE_CLOSED; + } + break; + } + /* Send Configure-Ack packet. */ + sp->pp_loopcnt = 0; + if (sp->lcp.state != LCP_STATE_OPENED) { + sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK, + h->ident, len-4, h+1); + } + /* Change the state. */ + switch (sp->lcp.state) { + case LCP_STATE_CLOSED: + sp->lcp.state = LCP_STATE_ACK_SENT; + break; + case LCP_STATE_ACK_RCVD: + sp->lcp.state = LCP_STATE_OPENED; + sppp_ipcp_open (sp); + break; + case LCP_STATE_OPENED: + /* Remote magic changed -- close session. */ + sp->lcp.state = LCP_STATE_CLOSED; + sp->ipcp.state = IPCP_STATE_CLOSED; + /* Initiate renegotiation. */ + sppp_lcp_open (sp); + /* Send ACK after our REQ in attempt to break loop */ + sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK, + h->ident, len-4, h+1); + sp->lcp.state = LCP_STATE_ACK_SENT; + break; + } + break; + case LCP_CONF_ACK: + if (h->ident != sp->lcp.confid) + break; + sppp_clear_timeout (sp); + if ((sp->pp_link_state != SPPP_LINK_UP) && + (dev->flags & IFF_UP)) { + /* Coming out of loopback mode. */ + sp->pp_link_state=SPPP_LINK_UP; + printk (KERN_INFO "%s: protocol up\n", dev->name); + } + switch (sp->lcp.state) { + case LCP_STATE_CLOSED: + sp->lcp.state = LCP_STATE_ACK_RCVD; + sppp_set_timeout (sp, 5); + break; + case LCP_STATE_ACK_SENT: + sp->lcp.state = LCP_STATE_OPENED; + sppp_ipcp_open (sp); + break; + } + break; + case LCP_CONF_NAK: + if (h->ident != sp->lcp.confid) + break; + p = (u8*) (h+1); + if (len>=10 && p[0] == LCP_OPT_MAGIC && p[1] >= 4) { + rmagic = (u32)p[2] << 24 | + (u32)p[3] << 16 | p[4] << 8 | p[5]; + if (rmagic == ~sp->lcp.magic) { + int newmagic; + if (sp->pp_flags & PP_DEBUG) + printk (KERN_DEBUG "%s: conf nak: magic glitch\n", + dev->name); + get_random_bytes(&newmagic, sizeof(newmagic)); + sp->lcp.magic += newmagic; + } else + sp->lcp.magic = rmagic; + } + if (sp->lcp.state != LCP_STATE_ACK_SENT) { + /* Go to closed state. */ + sp->lcp.state = LCP_STATE_CLOSED; + sp->ipcp.state = IPCP_STATE_CLOSED; + } + /* The link will be renegotiated after timeout, + * to avoid endless req-nack loop. */ + sppp_clear_timeout (sp); + sppp_set_timeout (sp, 2); + break; + case LCP_CONF_REJ: + if (h->ident != sp->lcp.confid) + break; + sppp_clear_timeout (sp); + /* Initiate renegotiation. */ + sppp_lcp_open (sp); + if (sp->lcp.state != LCP_STATE_ACK_SENT) { + /* Go to closed state. */ + sp->lcp.state = LCP_STATE_CLOSED; + sp->ipcp.state = IPCP_STATE_CLOSED; + } + break; + case LCP_TERM_REQ: + sppp_clear_timeout (sp); + /* Send Terminate-Ack packet. */ + sppp_cp_send (sp, PPP_LCP, LCP_TERM_ACK, h->ident, 0, NULL); + /* Go to closed state. */ + sp->lcp.state = LCP_STATE_CLOSED; + sp->ipcp.state = IPCP_STATE_CLOSED; + /* Initiate renegotiation. */ + sppp_lcp_open (sp); + break; + case LCP_TERM_ACK: + case LCP_CODE_REJ: + case LCP_PROTO_REJ: + /* Ignore for now. */ + break; + case LCP_DISC_REQ: + /* Discard the packet. */ + break; + case LCP_ECHO_REQ: + if (sp->lcp.state != LCP_STATE_OPENED) + break; + if (len < 8) { + if (sp->pp_flags & PP_DEBUG) + printk (KERN_WARNING "%s: invalid lcp echo request packet length: %d bytes\n", + dev->name, len); + break; + } + if (ntohl (*(long*)(h+1)) == sp->lcp.magic) { + /* Line loopback mode detected. */ + printk (KERN_WARNING "%s: loopback\n", dev->name); + if_down (dev); + + /* Shut down the PPP link. */ + sp->lcp.state = LCP_STATE_CLOSED; + sp->ipcp.state = IPCP_STATE_CLOSED; + sppp_clear_timeout (sp); + /* Initiate negotiation. */ + sppp_lcp_open (sp); + break; + } + *(long*)(h+1) = htonl (sp->lcp.magic); + sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REPLY, h->ident, len-4, h+1); + break; + case LCP_ECHO_REPLY: + if (h->ident != sp->lcp.echoid) + break; + if (len < 8) { + if (sp->pp_flags & PP_DEBUG) + printk (KERN_WARNING "%s: invalid lcp echo reply packet length: %d bytes\n", + dev->name, len); + break; + } + if (ntohl (*(long*)(h+1)) != sp->lcp.magic) + sp->pp_alivecnt = 0; + break; + } +} + +/* + * Handle incoming Cisco keepalive protocol packets. + */ + +static void sppp_cisco_input (struct sppp *sp, struct sk_buff *skb) +{ + struct cisco_packet *h; + struct net_device *dev = sp->pp_if; + + if (!pskb_may_pull(skb, sizeof(struct cisco_packet)) + || (skb->len != CISCO_PACKET_LEN + && skb->len != CISCO_BIG_PACKET_LEN)) { + if (sp->pp_flags & PP_DEBUG) + printk (KERN_WARNING "%s: invalid cisco packet length: %d bytes\n", + dev->name, skb->len); + return; + } + h = (struct cisco_packet *)skb->data; + skb_pull(skb, sizeof(struct cisco_packet*)); + if (sp->pp_flags & PP_DEBUG) + printk (KERN_WARNING "%s: cisco input: %d bytes <%xh %xh %xh %xh %xh-%xh>\n", + dev->name, skb->len, + ntohl (h->type), h->par1, h->par2, h->rel, + h->time0, h->time1); + switch (ntohl (h->type)) { + default: + if (sp->pp_flags & PP_DEBUG) + printk (KERN_WARNING "%s: unknown cisco packet type: 0x%x\n", + dev->name, ntohl (h->type)); + break; + case CISCO_ADDR_REPLY: + /* Reply on address request, ignore */ + break; + case CISCO_KEEPALIVE_REQ: + sp->pp_alivecnt = 0; + sp->pp_rseq = ntohl (h->par1); + if (sp->pp_seq == sp->pp_rseq) { + /* Local and remote sequence numbers are equal. + * Probably, the line is in loopback mode. */ + int newseq; + if (sp->pp_loopcnt >= MAXALIVECNT) { + printk (KERN_WARNING "%s: loopback\n", + dev->name); + sp->pp_loopcnt = 0; + if (dev->flags & IFF_UP) { + if_down (dev); + } + } + ++sp->pp_loopcnt; + + /* Generate new local sequence number */ + get_random_bytes(&newseq, sizeof(newseq)); + sp->pp_seq ^= newseq; + break; + } + sp->pp_loopcnt = 0; + if (sp->pp_link_state==SPPP_LINK_DOWN && + (dev->flags & IFF_UP)) { + sp->pp_link_state=SPPP_LINK_UP; + printk (KERN_INFO "%s: protocol up\n", dev->name); + } + break; + case CISCO_ADDR_REQ: + /* Stolen from net/ipv4/devinet.c -- SIOCGIFADDR ioctl */ + { + struct in_device *in_dev; + struct in_ifaddr *ifa; + u32 addr = 0, mask = ~0; /* FIXME: is the mask correct? */ +#ifdef CONFIG_INET + rcu_read_lock(); + if ((in_dev = __in_dev_get(dev)) != NULL) + { + for (ifa=in_dev->ifa_list; ifa != NULL; + ifa=ifa->ifa_next) { + if (strcmp(dev->name, ifa->ifa_label) == 0) + { + addr = ifa->ifa_local; + mask = ifa->ifa_mask; + break; + } + } + } + rcu_read_unlock(); +#endif + /* I hope both addr and mask are in the net order */ + sppp_cisco_send (sp, CISCO_ADDR_REPLY, addr, mask); + break; + } + } +} + + +/* + * Send PPP LCP packet. + */ + +static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type, + u8 ident, u16 len, void *data) +{ + struct ppp_header *h; + struct lcp_header *lh; + struct sk_buff *skb; + struct net_device *dev = sp->pp_if; + + skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+LCP_HEADER_LEN+len, + GFP_ATOMIC); + if (skb==NULL) + return; + + skb_reserve(skb,dev->hard_header_len); + + h = (struct ppp_header *)skb_put(skb, sizeof(struct ppp_header)); + h->address = PPP_ALLSTATIONS; /* broadcast address */ + h->control = PPP_UI; /* Unnumbered Info */ + h->protocol = htons (proto); /* Link Control Protocol */ + + lh = (struct lcp_header *)skb_put(skb, sizeof(struct lcp_header)); + lh->type = type; + lh->ident = ident; + lh->len = htons (LCP_HEADER_LEN + len); + + if (len) + memcpy(skb_put(skb,len),data, len); + + if (sp->pp_flags & PP_DEBUG) { + printk (KERN_WARNING "%s: %s output <%s id=%xh len=%xh", + dev->name, + proto==PPP_LCP ? "lcp" : "ipcp", + proto==PPP_LCP ? sppp_lcp_type_name (lh->type) : + sppp_ipcp_type_name (lh->type), lh->ident, + ntohs (lh->len)); + if (len) + sppp_print_bytes ((u8*) (lh+1), len); + printk (">\n"); + } + sp->obytes += skb->len; + /* Control is high priority so it doesn't get queued behind data */ + skb->priority=TC_PRIO_CONTROL; + skb->dev = dev; + skb_queue_tail(&tx_queue, skb); +} + +/* + * Send Cisco keepalive packet. + */ + +static void sppp_cisco_send (struct sppp *sp, int type, long par1, long par2) +{ + struct ppp_header *h; + struct cisco_packet *ch; + struct sk_buff *skb; + struct net_device *dev = sp->pp_if; + u32 t = jiffies * 1000/HZ; + + skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+CISCO_PACKET_LEN, + GFP_ATOMIC); + + if(skb==NULL) + return; + + skb_reserve(skb, dev->hard_header_len); + h = (struct ppp_header *)skb_put (skb, sizeof(struct ppp_header)); + h->address = CISCO_MULTICAST; + h->control = 0; + h->protocol = htons (CISCO_KEEPALIVE); + + ch = (struct cisco_packet*)skb_put(skb, CISCO_PACKET_LEN); + ch->type = htonl (type); + ch->par1 = htonl (par1); + ch->par2 = htonl (par2); + ch->rel = -1; + ch->time0 = htons ((u16) (t >> 16)); + ch->time1 = htons ((u16) t); + + if (sp->pp_flags & PP_DEBUG) + printk (KERN_WARNING "%s: cisco output: <%xh %xh %xh %xh %xh-%xh>\n", + dev->name, ntohl (ch->type), ch->par1, + ch->par2, ch->rel, ch->time0, ch->time1); + sp->obytes += skb->len; + skb->priority=TC_PRIO_CONTROL; + skb->dev = dev; + skb_queue_tail(&tx_queue, skb); +} + +/** + * sppp_close - close down a synchronous PPP or Cisco HDLC link + * @dev: The network device to drop the link of + * + * This drops the logical interface to the channel. It is not + * done politely as we assume we will also be dropping DTR. Any + * timeouts are killed. + */ + +int sppp_close (struct net_device *dev) +{ + struct sppp *sp = (struct sppp *)sppp_of(dev); + unsigned long flags; + + spin_lock_irqsave(&sp->lock, flags); + sp->pp_link_state = SPPP_LINK_DOWN; + sp->lcp.state = LCP_STATE_CLOSED; + sp->ipcp.state = IPCP_STATE_CLOSED; + sppp_clear_timeout (sp); + spin_unlock_irqrestore(&sp->lock, flags); + + return 0; +} + +EXPORT_SYMBOL(sppp_close); + +/** + * sppp_open - open a synchronous PPP or Cisco HDLC link + * @dev: Network device to activate + * + * Close down any existing synchronous session and commence + * from scratch. In the PPP case this means negotiating LCP/IPCP + * and friends, while for Cisco HDLC we simply need to start sending + * keepalives + */ + +int sppp_open (struct net_device *dev) +{ + struct sppp *sp = (struct sppp *)sppp_of(dev); + unsigned long flags; + + sppp_close(dev); + + spin_lock_irqsave(&sp->lock, flags); + if (!(sp->pp_flags & PP_CISCO)) { + sppp_lcp_open (sp); + } + sp->pp_link_state = SPPP_LINK_DOWN; + spin_unlock_irqrestore(&sp->lock, flags); + sppp_flush_xmit(); + + return 0; +} + +EXPORT_SYMBOL(sppp_open); + +/** + * sppp_reopen - notify of physical link loss + * @dev: Device that lost the link + * + * This function informs the synchronous protocol code that + * the underlying link died (for example a carrier drop on X.21) + * + * We increment the magic numbers to ensure that if the other end + * failed to notice we will correctly start a new session. It happens + * do to the nature of telco circuits is that you can lose carrier on + * one endonly. + * + * Having done this we go back to negotiating. This function may + * be called from an interrupt context. + */ + +int sppp_reopen (struct net_device *dev) +{ + struct sppp *sp = (struct sppp *)sppp_of(dev); + unsigned long flags; + + sppp_close(dev); + + spin_lock_irqsave(&sp->lock, flags); + if (!(sp->pp_flags & PP_CISCO)) + { + sp->lcp.magic = jiffies; + ++sp->pp_seq; + sp->lcp.state = LCP_STATE_CLOSED; + sp->ipcp.state = IPCP_STATE_CLOSED; + /* Give it a moment for the line to settle then go */ + sppp_set_timeout (sp, 1); + } + sp->pp_link_state=SPPP_LINK_DOWN; + spin_unlock_irqrestore(&sp->lock, flags); + + return 0; +} + +EXPORT_SYMBOL(sppp_reopen); + +/** + * sppp_change_mtu - Change the link MTU + * @dev: Device to change MTU on + * @new_mtu: New MTU + * + * Change the MTU on the link. This can only be called with + * the link down. It returns an error if the link is up or + * the mtu is out of range. + */ + +int sppp_change_mtu(struct net_device *dev, int new_mtu) +{ + if(new_mtu<128||new_mtu>PPP_MTU||(dev->flags&IFF_UP)) + return -EINVAL; + dev->mtu=new_mtu; + return 0; +} + +EXPORT_SYMBOL(sppp_change_mtu); + +/** + * sppp_do_ioctl - Ioctl handler for ppp/hdlc + * @dev: Device subject to ioctl + * @ifr: Interface request block from the user + * @cmd: Command that is being issued + * + * This function handles the ioctls that may be issued by the user + * to control the settings of a PPP/HDLC link. It does both busy + * and security checks. This function is intended to be wrapped by + * callers who wish to add additional ioctl calls of their own. + */ + +int sppp_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) +{ + struct sppp *sp = (struct sppp *)sppp_of(dev); + + if(dev->flags&IFF_UP) + return -EBUSY; + + if(!capable(CAP_NET_ADMIN)) + return -EPERM; + + switch(cmd) + { + case SPPPIOCCISCO: + sp->pp_flags|=PP_CISCO; + dev->type = ARPHRD_HDLC; + break; + case SPPPIOCPPP: + sp->pp_flags&=~PP_CISCO; + dev->type = ARPHRD_PPP; + break; + case SPPPIOCDEBUG: + sp->pp_flags&=~PP_DEBUG; + if(ifr->ifr_flags) + sp->pp_flags|=PP_DEBUG; + break; + case SPPPIOCGFLAGS: + if(copy_to_user(ifr->ifr_data, &sp->pp_flags, sizeof(sp->pp_flags))) + return -EFAULT; + break; + case SPPPIOCSFLAGS: + if(copy_from_user(&sp->pp_flags, ifr->ifr_data, sizeof(sp->pp_flags))) + return -EFAULT; + break; + default: + return -EINVAL; + } + return 0; +} + +EXPORT_SYMBOL(sppp_do_ioctl); + +/** + * sppp_attach - attach synchronous PPP/HDLC to a device + * @pd: PPP device to initialise + * + * This initialises the PPP/HDLC support on an interface. At the + * time of calling the dev element must point to the network device + * that this interface is attached to. The interface should not yet + * be registered. + */ + +void sppp_attach(struct ppp_device *pd) +{ + struct net_device *dev = pd->dev; + struct sppp *sp = &pd->sppp; + unsigned long flags; + + /* Make sure embedding is safe for sppp_of */ + BUG_ON(sppp_of(dev) != sp); + + spin_lock_irqsave(&spppq_lock, flags); + /* Initialize keepalive handler. */ + if (! spppq) + { + init_timer(&sppp_keepalive_timer); + sppp_keepalive_timer.expires=jiffies+10*HZ; + sppp_keepalive_timer.function=sppp_keepalive; + add_timer(&sppp_keepalive_timer); + } + /* Insert new entry into the keepalive list. */ + sp->pp_next = spppq; + spppq = sp; + spin_unlock_irqrestore(&spppq_lock, flags); + + sp->pp_loopcnt = 0; + sp->pp_alivecnt = 0; + sp->pp_seq = 0; + sp->pp_rseq = 0; + sp->pp_flags = PP_KEEPALIVE|PP_CISCO|debug;/*PP_DEBUG;*/ + sp->lcp.magic = 0; + sp->lcp.state = LCP_STATE_CLOSED; + sp->ipcp.state = IPCP_STATE_CLOSED; + sp->pp_if = dev; + spin_lock_init(&sp->lock); + + /* + * Device specific setup. All but interrupt handler and + * hard_start_xmit. + */ + + dev->hard_header = sppp_hard_header; + dev->rebuild_header = sppp_rebuild_header; + dev->tx_queue_len = 10; + dev->type = ARPHRD_HDLC; + dev->addr_len = 0; + dev->hard_header_len = sizeof(struct ppp_header); + dev->mtu = PPP_MTU; + /* + * These 4 are callers but MUST also call sppp_ functions + */ + dev->do_ioctl = sppp_do_ioctl; +#if 0 + dev->get_stats = NULL; /* Let the driver override these */ + dev->open = sppp_open; + dev->stop = sppp_close; +#endif + dev->change_mtu = sppp_change_mtu; + dev->hard_header_cache = NULL; + dev->header_cache_update = NULL; + dev->flags = IFF_MULTICAST|IFF_POINTOPOINT|IFF_NOARP; +} + +EXPORT_SYMBOL(sppp_attach); + +/** + * sppp_detach - release PPP resources from a device + * @dev: Network device to release + * + * Stop and free up any PPP/HDLC resources used by this + * interface. This must be called before the device is + * freed. + */ + +void sppp_detach (struct net_device *dev) +{ + struct sppp **q, *p, *sp = (struct sppp *)sppp_of(dev); + unsigned long flags; + + spin_lock_irqsave(&spppq_lock, flags); + /* Remove the entry from the keepalive list. */ + for (q = &spppq; (p = *q); q = &p->pp_next) + if (p == sp) { + *q = p->pp_next; + break; + } + + /* Stop keepalive handler. */ + if (! spppq) + del_timer(&sppp_keepalive_timer); + sppp_clear_timeout (sp); + spin_unlock_irqrestore(&spppq_lock, flags); +} + +EXPORT_SYMBOL(sppp_detach); + +/* + * Analyze the LCP Configure-Request options list + * for the presence of unknown options. + * If the request contains unknown options, build and + * send Configure-reject packet, containing only unknown options. + */ +static int +sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h, + int len, u32 *magic) +{ + u8 *buf, *r, *p; + int rlen; + + len -= 4; + buf = r = kmalloc (len, GFP_ATOMIC); + if (! buf) + return (0); + + p = (void*) (h+1); + for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { + switch (*p) { + case LCP_OPT_MAGIC: + /* Magic number -- extract. */ + if (len >= 6 && p[1] == 6) { + *magic = (u32)p[2] << 24 | + (u32)p[3] << 16 | p[4] << 8 | p[5]; + continue; + } + break; + case LCP_OPT_ASYNC_MAP: + /* Async control character map -- check to be zero. */ + if (len >= 6 && p[1] == 6 && ! p[2] && ! p[3] && + ! p[4] && ! p[5]) + continue; + break; + case LCP_OPT_MRU: + /* Maximum receive unit -- always OK. */ + continue; + default: + /* Others not supported. */ + break; + } + /* Add the option to rejected list. */ + memcpy(r, p, p[1]); + r += p[1]; + rlen += p[1]; + } + if (rlen) + sppp_cp_send (sp, PPP_LCP, LCP_CONF_REJ, h->ident, rlen, buf); + kfree(buf); + return (rlen == 0); +} + +static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *skb) +{ + struct lcp_header *h; + struct net_device *dev = sp->pp_if; + int len = skb->len; + + if (!pskb_may_pull(skb, sizeof(struct lcp_header))) { + if (sp->pp_flags & PP_DEBUG) + printk (KERN_WARNING "%s: invalid ipcp packet length: %d bytes\n", + dev->name, len); + return; + } + h = (struct lcp_header *)skb->data; + skb_pull(skb,sizeof(struct lcp_header)); + if (sp->pp_flags & PP_DEBUG) { + printk (KERN_WARNING "%s: ipcp input: %d bytes <%s id=%xh len=%xh", + dev->name, len, + sppp_ipcp_type_name (h->type), h->ident, ntohs (h->len)); + if (len > 4) + sppp_print_bytes ((u8*) (h+1), len-4); + printk (">\n"); + } + if (len > ntohs (h->len)) + len = ntohs (h->len); + switch (h->type) { + default: + /* Unknown packet type -- send Code-Reject packet. */ + sppp_cp_send (sp, PPP_IPCP, IPCP_CODE_REJ, ++sp->pp_seq, len, h); + break; + case IPCP_CONF_REQ: + if (len < 4) { + if (sp->pp_flags & PP_DEBUG) + printk (KERN_WARNING "%s: invalid ipcp configure request packet length: %d bytes\n", + dev->name, len); + return; + } + if (len > 4) { + sppp_cp_send (sp, PPP_IPCP, LCP_CONF_REJ, h->ident, + len-4, h+1); + + switch (sp->ipcp.state) { + case IPCP_STATE_OPENED: + /* Initiate renegotiation. */ + sppp_ipcp_open (sp); + /* fall through... */ + case IPCP_STATE_ACK_SENT: + /* Go to closed state. */ + sp->ipcp.state = IPCP_STATE_CLOSED; + } + } else { + /* Send Configure-Ack packet. */ + sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_ACK, h->ident, + 0, NULL); + /* Change the state. */ + if (sp->ipcp.state == IPCP_STATE_ACK_RCVD) + sp->ipcp.state = IPCP_STATE_OPENED; + else + sp->ipcp.state = IPCP_STATE_ACK_SENT; + } + break; + case IPCP_CONF_ACK: + if (h->ident != sp->ipcp.confid) + break; + sppp_clear_timeout (sp); + switch (sp->ipcp.state) { + case IPCP_STATE_CLOSED: + sp->ipcp.state = IPCP_STATE_ACK_RCVD; + sppp_set_timeout (sp, 5); + break; + case IPCP_STATE_ACK_SENT: + sp->ipcp.state = IPCP_STATE_OPENED; + break; + } + break; + case IPCP_CONF_NAK: + case IPCP_CONF_REJ: + if (h->ident != sp->ipcp.confid) + break; + sppp_clear_timeout (sp); + /* Initiate renegotiation. */ + sppp_ipcp_open (sp); + if (sp->ipcp.state != IPCP_STATE_ACK_SENT) + /* Go to closed state. */ + sp->ipcp.state = IPCP_STATE_CLOSED; + break; + case IPCP_TERM_REQ: + /* Send Terminate-Ack packet. */ + sppp_cp_send (sp, PPP_IPCP, IPCP_TERM_ACK, h->ident, 0, NULL); + /* Go to closed state. */ + sp->ipcp.state = IPCP_STATE_CLOSED; + /* Initiate renegotiation. */ + sppp_ipcp_open (sp); + break; + case IPCP_TERM_ACK: + /* Ignore for now. */ + case IPCP_CODE_REJ: + /* Ignore for now. */ + break; + } +} + +static void sppp_lcp_open (struct sppp *sp) +{ + char opt[6]; + + if (! sp->lcp.magic) + sp->lcp.magic = jiffies; + opt[0] = LCP_OPT_MAGIC; + opt[1] = sizeof (opt); + opt[2] = sp->lcp.magic >> 24; + opt[3] = sp->lcp.magic >> 16; + opt[4] = sp->lcp.magic >> 8; + opt[5] = sp->lcp.magic; + sp->lcp.confid = ++sp->pp_seq; + sppp_cp_send (sp, PPP_LCP, LCP_CONF_REQ, sp->lcp.confid, + sizeof (opt), &opt); + sppp_set_timeout (sp, 2); +} + +static void sppp_ipcp_open (struct sppp *sp) +{ + sp->ipcp.confid = ++sp->pp_seq; + sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_REQ, sp->ipcp.confid, 0, NULL); + sppp_set_timeout (sp, 2); +} + +/* + * Process PPP control protocol timeouts. + */ + +static void sppp_cp_timeout (unsigned long arg) +{ + struct sppp *sp = (struct sppp*) arg; + unsigned long flags; + + spin_lock_irqsave(&sp->lock, flags); + + sp->pp_flags &= ~PP_TIMO; + if (! (sp->pp_if->flags & IFF_UP) || (sp->pp_flags & PP_CISCO)) { + spin_unlock_irqrestore(&sp->lock, flags); + return; + } + switch (sp->lcp.state) { + case LCP_STATE_CLOSED: + /* No ACK for Configure-Request, retry. */ + sppp_lcp_open (sp); + break; + case LCP_STATE_ACK_RCVD: + /* ACK got, but no Configure-Request for peer, retry. */ + sppp_lcp_open (sp); + sp->lcp.state = LCP_STATE_CLOSED; + break; + case LCP_STATE_ACK_SENT: + /* ACK sent but no ACK for Configure-Request, retry. */ + sppp_lcp_open (sp); + break; + case LCP_STATE_OPENED: + /* LCP is already OK, try IPCP. */ + switch (sp->ipcp.state) { + case IPCP_STATE_CLOSED: + /* No ACK for Configure-Request, retry. */ + sppp_ipcp_open (sp); + break; + case IPCP_STATE_ACK_RCVD: + /* ACK got, but no Configure-Request for peer, retry. */ + sppp_ipcp_open (sp); + sp->ipcp.state = IPCP_STATE_CLOSED; + break; + case IPCP_STATE_ACK_SENT: + /* ACK sent but no ACK for Configure-Request, retry. */ + sppp_ipcp_open (sp); + break; + case IPCP_STATE_OPENED: + /* IPCP is OK. */ + break; + } + break; + } + spin_unlock_irqrestore(&sp->lock, flags); + sppp_flush_xmit(); +} + +static char *sppp_lcp_type_name (u8 type) +{ + static char buf [8]; + switch (type) { + case LCP_CONF_REQ: return ("conf-req"); + case LCP_CONF_ACK: return ("conf-ack"); + case LCP_CONF_NAK: return ("conf-nack"); + case LCP_CONF_REJ: return ("conf-rej"); + case LCP_TERM_REQ: return ("term-req"); + case LCP_TERM_ACK: return ("term-ack"); + case LCP_CODE_REJ: return ("code-rej"); + case LCP_PROTO_REJ: return ("proto-rej"); + case LCP_ECHO_REQ: return ("echo-req"); + case LCP_ECHO_REPLY: return ("echo-reply"); + case LCP_DISC_REQ: return ("discard-req"); + } + sprintf (buf, "%xh", type); + return (buf); +} + +static char *sppp_ipcp_type_name (u8 type) +{ + static char buf [8]; + switch (type) { + case IPCP_CONF_REQ: return ("conf-req"); + case IPCP_CONF_ACK: return ("conf-ack"); + case IPCP_CONF_NAK: return ("conf-nack"); + case IPCP_CONF_REJ: return ("conf-rej"); + case IPCP_TERM_REQ: return ("term-req"); + case IPCP_TERM_ACK: return ("term-ack"); + case IPCP_CODE_REJ: return ("code-rej"); + } + sprintf (buf, "%xh", type); + return (buf); +} + +static void sppp_print_bytes (u_char *p, u16 len) +{ + printk (" %x", *p++); + while (--len > 0) + printk ("-%x", *p++); +} + +/** + * sppp_rcv - receive and process a WAN PPP frame + * @skb: The buffer to process + * @dev: The device it arrived on + * @p: Unused + * + * Protocol glue. This drives the deferred processing mode the poorer + * cards use. This can be called directly by cards that do not have + * timing constraints but is normally called from the network layer + * after interrupt servicing to process frames queued via netif_rx. + */ + +static int sppp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *p) +{ + if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) + return NET_RX_DROP; + sppp_input(dev,skb); + return 0; +} + +struct packet_type sppp_packet_type = { + .type = __constant_htons(ETH_P_WAN_PPP), + .func = sppp_rcv, +}; + +static char banner[] __initdata = + KERN_INFO "Cronyx Ltd, Synchronous PPP and CISCO HDLC (c) 1994\n" + KERN_INFO "Linux port (c) 1998 Building Number Three Ltd & " + "Jan \"Yenya\" Kasprzak.\n"; + +static int __init sync_ppp_init(void) +{ + if(debug) + debug=PP_DEBUG; + printk(banner); + skb_queue_head_init(&tx_queue); + dev_add_pack(&sppp_packet_type); + return 0; +} + + +static void __exit sync_ppp_cleanup(void) +{ + dev_remove_pack(&sppp_packet_type); +} + +module_init(sync_ppp_init); +module_exit(sync_ppp_cleanup); +module_param(debug, int, 0); +MODULE_LICENSE("GPL"); + |