712 lines
19 KiB
C
712 lines
19 KiB
C
/*
|
|
* Generic HDLC support routines for Linux
|
|
* Point-to-point protocol support
|
|
*
|
|
* Copyright (C) 1999 - 2008 Krzysztof Halasa <khc@pm.waw.pl>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of version 2 of the GNU General Public License
|
|
* as published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/errno.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/skbuff.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#define DEBUG_CP 0 /* also bytes# to dump */
|
|
#define DEBUG_STATE 0
|
|
#define DEBUG_HARD_HEADER 0
|
|
|
|
#define HDLC_ADDR_ALLSTATIONS 0xFF
|
|
#define HDLC_CTRL_UI 0x03
|
|
|
|
#define PID_LCP 0xC021
|
|
#define PID_IP 0x0021
|
|
#define PID_IPCP 0x8021
|
|
#define PID_IPV6 0x0057
|
|
#define PID_IPV6CP 0x8057
|
|
|
|
enum {IDX_LCP = 0, IDX_IPCP, IDX_IPV6CP, IDX_COUNT};
|
|
enum {CP_CONF_REQ = 1, CP_CONF_ACK, CP_CONF_NAK, CP_CONF_REJ, CP_TERM_REQ,
|
|
CP_TERM_ACK, CP_CODE_REJ, LCP_PROTO_REJ, LCP_ECHO_REQ, LCP_ECHO_REPLY,
|
|
LCP_DISC_REQ, CP_CODES};
|
|
#if DEBUG_CP
|
|
static const char *const code_names[CP_CODES] = {
|
|
"0", "ConfReq", "ConfAck", "ConfNak", "ConfRej", "TermReq",
|
|
"TermAck", "CodeRej", "ProtoRej", "EchoReq", "EchoReply", "Discard"
|
|
};
|
|
static char debug_buffer[64 + 3 * DEBUG_CP];
|
|
#endif
|
|
|
|
enum {LCP_OPTION_MRU = 1, LCP_OPTION_ACCM, LCP_OPTION_MAGIC = 5};
|
|
|
|
struct hdlc_header {
|
|
u8 address;
|
|
u8 control;
|
|
__be16 protocol;
|
|
};
|
|
|
|
struct cp_header {
|
|
u8 code;
|
|
u8 id;
|
|
__be16 len;
|
|
};
|
|
|
|
|
|
struct proto {
|
|
struct net_device *dev;
|
|
struct timer_list timer;
|
|
unsigned long timeout;
|
|
u16 pid; /* protocol ID */
|
|
u8 state;
|
|
u8 cr_id; /* ID of last Configuration-Request */
|
|
u8 restart_counter;
|
|
};
|
|
|
|
struct ppp {
|
|
struct proto protos[IDX_COUNT];
|
|
spinlock_t lock;
|
|
unsigned long last_pong;
|
|
unsigned int req_timeout, cr_retries, term_retries;
|
|
unsigned int keepalive_interval, keepalive_timeout;
|
|
u8 seq; /* local sequence number for requests */
|
|
u8 echo_id; /* ID of last Echo-Request (LCP) */
|
|
};
|
|
|
|
enum {CLOSED = 0, STOPPED, STOPPING, REQ_SENT, ACK_RECV, ACK_SENT, OPENED,
|
|
STATES, STATE_MASK = 0xF};
|
|
enum {START = 0, STOP, TO_GOOD, TO_BAD, RCR_GOOD, RCR_BAD, RCA, RCN, RTR, RTA,
|
|
RUC, RXJ_GOOD, RXJ_BAD, EVENTS};
|
|
enum {INV = 0x10, IRC = 0x20, ZRC = 0x40, SCR = 0x80, SCA = 0x100,
|
|
SCN = 0x200, STR = 0x400, STA = 0x800, SCJ = 0x1000};
|
|
|
|
#if DEBUG_STATE
|
|
static const char *const state_names[STATES] = {
|
|
"Closed", "Stopped", "Stopping", "ReqSent", "AckRecv", "AckSent",
|
|
"Opened"
|
|
};
|
|
static const char *const event_names[EVENTS] = {
|
|
"Start", "Stop", "TO+", "TO-", "RCR+", "RCR-", "RCA", "RCN",
|
|
"RTR", "RTA", "RUC", "RXJ+", "RXJ-"
|
|
};
|
|
#endif
|
|
|
|
static struct sk_buff_head tx_queue; /* used when holding the spin lock */
|
|
|
|
static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr);
|
|
|
|
static inline struct ppp* get_ppp(struct net_device *dev)
|
|
{
|
|
return (struct ppp *)dev_to_hdlc(dev)->state;
|
|
}
|
|
|
|
static inline struct proto* get_proto(struct net_device *dev, u16 pid)
|
|
{
|
|
struct ppp *ppp = get_ppp(dev);
|
|
|
|
switch (pid) {
|
|
case PID_LCP:
|
|
return &ppp->protos[IDX_LCP];
|
|
case PID_IPCP:
|
|
return &ppp->protos[IDX_IPCP];
|
|
case PID_IPV6CP:
|
|
return &ppp->protos[IDX_IPV6CP];
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static inline const char* proto_name(u16 pid)
|
|
{
|
|
switch (pid) {
|
|
case PID_LCP:
|
|
return "LCP";
|
|
case PID_IPCP:
|
|
return "IPCP";
|
|
case PID_IPV6CP:
|
|
return "IPV6CP";
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct hdlc_header *data = (struct hdlc_header*)skb->data;
|
|
|
|
if (skb->len < sizeof(struct hdlc_header))
|
|
return htons(ETH_P_HDLC);
|
|
if (data->address != HDLC_ADDR_ALLSTATIONS ||
|
|
data->control != HDLC_CTRL_UI)
|
|
return htons(ETH_P_HDLC);
|
|
|
|
switch (data->protocol) {
|
|
case __constant_htons(PID_IP):
|
|
skb_pull(skb, sizeof(struct hdlc_header));
|
|
return htons(ETH_P_IP);
|
|
|
|
case __constant_htons(PID_IPV6):
|
|
skb_pull(skb, sizeof(struct hdlc_header));
|
|
return htons(ETH_P_IPV6);
|
|
|
|
default:
|
|
return htons(ETH_P_HDLC);
|
|
}
|
|
}
|
|
|
|
|
|
static int ppp_hard_header(struct sk_buff *skb, struct net_device *dev,
|
|
u16 type, const void *daddr, const void *saddr,
|
|
unsigned int len)
|
|
{
|
|
struct hdlc_header *data;
|
|
#if DEBUG_HARD_HEADER
|
|
printk(KERN_DEBUG "%s: ppp_hard_header() called\n", dev->name);
|
|
#endif
|
|
|
|
skb_push(skb, sizeof(struct hdlc_header));
|
|
data = (struct hdlc_header*)skb->data;
|
|
|
|
data->address = HDLC_ADDR_ALLSTATIONS;
|
|
data->control = HDLC_CTRL_UI;
|
|
switch (type) {
|
|
case ETH_P_IP:
|
|
data->protocol = htons(PID_IP);
|
|
break;
|
|
case ETH_P_IPV6:
|
|
data->protocol = htons(PID_IPV6);
|
|
break;
|
|
case PID_LCP:
|
|
case PID_IPCP:
|
|
case PID_IPV6CP:
|
|
data->protocol = htons(type);
|
|
break;
|
|
default: /* unknown protocol */
|
|
data->protocol = 0;
|
|
}
|
|
return sizeof(struct hdlc_header);
|
|
}
|
|
|
|
|
|
static void ppp_tx_flush(void)
|
|
{
|
|
struct sk_buff *skb;
|
|
while ((skb = skb_dequeue(&tx_queue)) != NULL)
|
|
dev_queue_xmit(skb);
|
|
}
|
|
|
|
static void ppp_tx_cp(struct net_device *dev, u16 pid, u8 code,
|
|
u8 id, unsigned int len, const void *data)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct cp_header *cp;
|
|
unsigned int magic_len = 0;
|
|
static u32 magic;
|
|
|
|
#if DEBUG_CP
|
|
int i;
|
|
char *ptr;
|
|
#endif
|
|
|
|
if (pid == PID_LCP && (code == LCP_ECHO_REQ || code == LCP_ECHO_REPLY))
|
|
magic_len = sizeof(magic);
|
|
|
|
skb = dev_alloc_skb(sizeof(struct hdlc_header) +
|
|
sizeof(struct cp_header) + magic_len + len);
|
|
if (!skb) {
|
|
printk(KERN_WARNING "%s: out of memory in ppp_tx_cp()\n",
|
|
dev->name);
|
|
return;
|
|
}
|
|
skb_reserve(skb, sizeof(struct hdlc_header));
|
|
|
|
cp = (struct cp_header *)skb_put(skb, sizeof(struct cp_header));
|
|
cp->code = code;
|
|
cp->id = id;
|
|
cp->len = htons(sizeof(struct cp_header) + magic_len + len);
|
|
|
|
if (magic_len)
|
|
memcpy(skb_put(skb, magic_len), &magic, magic_len);
|
|
if (len)
|
|
memcpy(skb_put(skb, len), data, len);
|
|
|
|
#if DEBUG_CP
|
|
BUG_ON(code >= CP_CODES);
|
|
ptr = debug_buffer;
|
|
*ptr = '\x0';
|
|
for (i = 0; i < min_t(unsigned int, magic_len + len, DEBUG_CP); i++) {
|
|
sprintf(ptr, " %02X", skb->data[sizeof(struct cp_header) + i]);
|
|
ptr += strlen(ptr);
|
|
}
|
|
printk(KERN_DEBUG "%s: TX %s [%s id 0x%X]%s\n", dev->name,
|
|
proto_name(pid), code_names[code], id, debug_buffer);
|
|
#endif
|
|
|
|
ppp_hard_header(skb, dev, pid, NULL, NULL, 0);
|
|
|
|
skb->priority = TC_PRIO_CONTROL;
|
|
skb->dev = dev;
|
|
skb_reset_network_header(skb);
|
|
skb_queue_tail(&tx_queue, skb);
|
|
}
|
|
|
|
|
|
/* State transition table (compare STD-51)
|
|
Events Actions
|
|
TO+ = Timeout with counter > 0 irc = Initialize-Restart-Count
|
|
TO- = Timeout with counter expired zrc = Zero-Restart-Count
|
|
|
|
RCR+ = Receive-Configure-Request (Good) scr = Send-Configure-Request
|
|
RCR- = Receive-Configure-Request (Bad)
|
|
RCA = Receive-Configure-Ack sca = Send-Configure-Ack
|
|
RCN = Receive-Configure-Nak/Rej scn = Send-Configure-Nak/Rej
|
|
|
|
RTR = Receive-Terminate-Request str = Send-Terminate-Request
|
|
RTA = Receive-Terminate-Ack sta = Send-Terminate-Ack
|
|
|
|
RUC = Receive-Unknown-Code scj = Send-Code-Reject
|
|
RXJ+ = Receive-Code-Reject (permitted)
|
|
or Receive-Protocol-Reject
|
|
RXJ- = Receive-Code-Reject (catastrophic)
|
|
or Receive-Protocol-Reject
|
|
*/
|
|
static int cp_table[EVENTS][STATES] = {
|
|
/* CLOSED STOPPED STOPPING REQ_SENT ACK_RECV ACK_SENT OPENED
|
|
0 1 2 3 4 5 6 */
|
|
{IRC|SCR|3, INV , INV , INV , INV , INV , INV }, /* START */
|
|
{ INV , 0 , 0 , 0 , 0 , 0 , 0 }, /* STOP */
|
|
{ INV , INV ,STR|2, SCR|3 ,SCR|3, SCR|5 , INV }, /* TO+ */
|
|
{ INV , INV , 1 , 1 , 1 , 1 , INV }, /* TO- */
|
|
{ STA|0 ,IRC|SCR|SCA|5, 2 , SCA|5 ,SCA|6, SCA|5 ,SCR|SCA|5}, /* RCR+ */
|
|
{ STA|0 ,IRC|SCR|SCN|3, 2 , SCN|3 ,SCN|4, SCN|3 ,SCR|SCN|3}, /* RCR- */
|
|
{ STA|0 , STA|1 , 2 , IRC|4 ,SCR|3, 6 , SCR|3 }, /* RCA */
|
|
{ STA|0 , STA|1 , 2 ,IRC|SCR|3,SCR|3,IRC|SCR|5, SCR|3 }, /* RCN */
|
|
{ STA|0 , STA|1 ,STA|2, STA|3 ,STA|3, STA|3 ,ZRC|STA|2}, /* RTR */
|
|
{ 0 , 1 , 1 , 3 , 3 , 5 , SCR|3 }, /* RTA */
|
|
{ SCJ|0 , SCJ|1 ,SCJ|2, SCJ|3 ,SCJ|4, SCJ|5 , SCJ|6 }, /* RUC */
|
|
{ 0 , 1 , 2 , 3 , 3 , 5 , 6 }, /* RXJ+ */
|
|
{ 0 , 1 , 1 , 1 , 1 , 1 ,IRC|STR|2}, /* RXJ- */
|
|
};
|
|
|
|
|
|
/* SCA: RCR+ must supply id, len and data
|
|
SCN: RCR- must supply code, id, len and data
|
|
STA: RTR must supply id
|
|
SCJ: RUC must supply CP packet len and data */
|
|
static void ppp_cp_event(struct net_device *dev, u16 pid, u16 event, u8 code,
|
|
u8 id, unsigned int len, void *data)
|
|
{
|
|
int old_state, action;
|
|
struct ppp *ppp = get_ppp(dev);
|
|
struct proto *proto = get_proto(dev, pid);
|
|
|
|
old_state = proto->state;
|
|
BUG_ON(old_state >= STATES);
|
|
BUG_ON(event >= EVENTS);
|
|
|
|
#if DEBUG_STATE
|
|
printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) %s ...\n", dev->name,
|
|
proto_name(pid), event_names[event], state_names[proto->state]);
|
|
#endif
|
|
|
|
action = cp_table[event][old_state];
|
|
|
|
proto->state = action & STATE_MASK;
|
|
if (action & (SCR | STR)) /* set Configure-Req/Terminate-Req timer */
|
|
mod_timer(&proto->timer, proto->timeout =
|
|
jiffies + ppp->req_timeout * HZ);
|
|
if (action & ZRC)
|
|
proto->restart_counter = 0;
|
|
if (action & IRC)
|
|
proto->restart_counter = (proto->state == STOPPING) ?
|
|
ppp->term_retries : ppp->cr_retries;
|
|
|
|
if (action & SCR) /* send Configure-Request */
|
|
ppp_tx_cp(dev, pid, CP_CONF_REQ, proto->cr_id = ++ppp->seq,
|
|
0, NULL);
|
|
if (action & SCA) /* send Configure-Ack */
|
|
ppp_tx_cp(dev, pid, CP_CONF_ACK, id, len, data);
|
|
if (action & SCN) /* send Configure-Nak/Reject */
|
|
ppp_tx_cp(dev, pid, code, id, len, data);
|
|
if (action & STR) /* send Terminate-Request */
|
|
ppp_tx_cp(dev, pid, CP_TERM_REQ, ++ppp->seq, 0, NULL);
|
|
if (action & STA) /* send Terminate-Ack */
|
|
ppp_tx_cp(dev, pid, CP_TERM_ACK, id, 0, NULL);
|
|
if (action & SCJ) /* send Code-Reject */
|
|
ppp_tx_cp(dev, pid, CP_CODE_REJ, ++ppp->seq, len, data);
|
|
|
|
if (old_state != OPENED && proto->state == OPENED) {
|
|
printk(KERN_INFO "%s: %s up\n", dev->name, proto_name(pid));
|
|
if (pid == PID_LCP) {
|
|
netif_dormant_off(dev);
|
|
ppp_cp_event(dev, PID_IPCP, START, 0, 0, 0, NULL);
|
|
ppp_cp_event(dev, PID_IPV6CP, START, 0, 0, 0, NULL);
|
|
ppp->last_pong = jiffies;
|
|
mod_timer(&proto->timer, proto->timeout =
|
|
jiffies + ppp->keepalive_interval * HZ);
|
|
}
|
|
}
|
|
if (old_state == OPENED && proto->state != OPENED) {
|
|
printk(KERN_INFO "%s: %s down\n", dev->name, proto_name(pid));
|
|
if (pid == PID_LCP) {
|
|
netif_dormant_on(dev);
|
|
ppp_cp_event(dev, PID_IPCP, STOP, 0, 0, 0, NULL);
|
|
ppp_cp_event(dev, PID_IPV6CP, STOP, 0, 0, 0, NULL);
|
|
}
|
|
}
|
|
if (old_state != CLOSED && proto->state == CLOSED)
|
|
del_timer(&proto->timer);
|
|
|
|
#if DEBUG_STATE
|
|
printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) ... %s\n", dev->name,
|
|
proto_name(pid), event_names[event], state_names[proto->state]);
|
|
#endif
|
|
}
|
|
|
|
|
|
static void ppp_cp_parse_cr(struct net_device *dev, u16 pid, u8 id,
|
|
unsigned int len, u8 *data)
|
|
{
|
|
static u8 const valid_accm[6] = { LCP_OPTION_ACCM, 6, 0, 0, 0, 0 };
|
|
u8 *opt, *out;
|
|
unsigned int nak_len = 0, rej_len = 0;
|
|
|
|
if (!(out = kmalloc(len, GFP_ATOMIC))) {
|
|
dev->stats.rx_dropped++;
|
|
return; /* out of memory, ignore CR packet */
|
|
}
|
|
|
|
for (opt = data; len; len -= opt[1], opt += opt[1]) {
|
|
if (len < 2 || len < opt[1]) {
|
|
dev->stats.rx_errors++;
|
|
return; /* bad packet, drop silently */
|
|
}
|
|
|
|
if (pid == PID_LCP)
|
|
switch (opt[0]) {
|
|
case LCP_OPTION_MRU:
|
|
continue; /* MRU always OK and > 1500 bytes? */
|
|
|
|
case LCP_OPTION_ACCM: /* async control character map */
|
|
if (!memcmp(opt, valid_accm,
|
|
sizeof(valid_accm)))
|
|
continue;
|
|
if (!rej_len) { /* NAK it */
|
|
memcpy(out + nak_len, valid_accm,
|
|
sizeof(valid_accm));
|
|
nak_len += sizeof(valid_accm);
|
|
continue;
|
|
}
|
|
break;
|
|
case LCP_OPTION_MAGIC:
|
|
if (opt[1] != 6 || (!opt[2] && !opt[3] &&
|
|
!opt[4] && !opt[5]))
|
|
break; /* reject invalid magic number */
|
|
continue;
|
|
}
|
|
/* reject this option */
|
|
memcpy(out + rej_len, opt, opt[1]);
|
|
rej_len += opt[1];
|
|
}
|
|
|
|
if (rej_len)
|
|
ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_REJ, id, rej_len, out);
|
|
else if (nak_len)
|
|
ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_NAK, id, nak_len, out);
|
|
else
|
|
ppp_cp_event(dev, pid, RCR_GOOD, CP_CONF_ACK, id, len, data);
|
|
|
|
kfree(out);
|
|
}
|
|
|
|
static int ppp_rx(struct sk_buff *skb)
|
|
{
|
|
struct hdlc_header *hdr = (struct hdlc_header*)skb->data;
|
|
struct net_device *dev = skb->dev;
|
|
struct ppp *ppp = get_ppp(dev);
|
|
struct proto *proto;
|
|
struct cp_header *cp;
|
|
unsigned long flags;
|
|
unsigned int len;
|
|
u16 pid;
|
|
#if DEBUG_CP
|
|
int i;
|
|
char *ptr;
|
|
#endif
|
|
|
|
spin_lock_irqsave(&ppp->lock, flags);
|
|
/* Check HDLC header */
|
|
if (skb->len < sizeof(struct hdlc_header))
|
|
goto rx_error;
|
|
cp = (struct cp_header*)skb_pull(skb, sizeof(struct hdlc_header));
|
|
if (hdr->address != HDLC_ADDR_ALLSTATIONS ||
|
|
hdr->control != HDLC_CTRL_UI)
|
|
goto rx_error;
|
|
|
|
pid = ntohs(hdr->protocol);
|
|
proto = get_proto(dev, pid);
|
|
if (!proto) {
|
|
if (ppp->protos[IDX_LCP].state == OPENED)
|
|
ppp_tx_cp(dev, PID_LCP, LCP_PROTO_REJ,
|
|
++ppp->seq, skb->len + 2, &hdr->protocol);
|
|
goto rx_error;
|
|
}
|
|
|
|
len = ntohs(cp->len);
|
|
if (len < sizeof(struct cp_header) /* no complete CP header? */ ||
|
|
skb->len < len /* truncated packet? */)
|
|
goto rx_error;
|
|
skb_pull(skb, sizeof(struct cp_header));
|
|
len -= sizeof(struct cp_header);
|
|
|
|
/* HDLC and CP headers stripped from skb */
|
|
#if DEBUG_CP
|
|
if (cp->code < CP_CODES)
|
|
sprintf(debug_buffer, "[%s id 0x%X]", code_names[cp->code],
|
|
cp->id);
|
|
else
|
|
sprintf(debug_buffer, "[code %u id 0x%X]", cp->code, cp->id);
|
|
ptr = debug_buffer + strlen(debug_buffer);
|
|
for (i = 0; i < min_t(unsigned int, len, DEBUG_CP); i++) {
|
|
sprintf(ptr, " %02X", skb->data[i]);
|
|
ptr += strlen(ptr);
|
|
}
|
|
printk(KERN_DEBUG "%s: RX %s %s\n", dev->name, proto_name(pid),
|
|
debug_buffer);
|
|
#endif
|
|
|
|
/* LCP only */
|
|
if (pid == PID_LCP)
|
|
switch (cp->code) {
|
|
case LCP_PROTO_REJ:
|
|
pid = ntohs(*(__be16*)skb->data);
|
|
if (pid == PID_LCP || pid == PID_IPCP ||
|
|
pid == PID_IPV6CP)
|
|
ppp_cp_event(dev, pid, RXJ_BAD, 0, 0,
|
|
0, NULL);
|
|
goto out;
|
|
|
|
case LCP_ECHO_REQ: /* send Echo-Reply */
|
|
if (len >= 4 && proto->state == OPENED)
|
|
ppp_tx_cp(dev, PID_LCP, LCP_ECHO_REPLY,
|
|
cp->id, len - 4, skb->data + 4);
|
|
goto out;
|
|
|
|
case LCP_ECHO_REPLY:
|
|
if (cp->id == ppp->echo_id)
|
|
ppp->last_pong = jiffies;
|
|
goto out;
|
|
|
|
case LCP_DISC_REQ: /* discard */
|
|
goto out;
|
|
}
|
|
|
|
/* LCP, IPCP and IPV6CP */
|
|
switch (cp->code) {
|
|
case CP_CONF_REQ:
|
|
ppp_cp_parse_cr(dev, pid, cp->id, len, skb->data);
|
|
goto out;
|
|
|
|
case CP_CONF_ACK:
|
|
if (cp->id == proto->cr_id)
|
|
ppp_cp_event(dev, pid, RCA, 0, 0, 0, NULL);
|
|
goto out;
|
|
|
|
case CP_CONF_REJ:
|
|
case CP_CONF_NAK:
|
|
if (cp->id == proto->cr_id)
|
|
ppp_cp_event(dev, pid, RCN, 0, 0, 0, NULL);
|
|
goto out;
|
|
|
|
case CP_TERM_REQ:
|
|
ppp_cp_event(dev, pid, RTR, 0, cp->id, 0, NULL);
|
|
goto out;
|
|
|
|
case CP_TERM_ACK:
|
|
ppp_cp_event(dev, pid, RTA, 0, 0, 0, NULL);
|
|
goto out;
|
|
|
|
case CP_CODE_REJ:
|
|
ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, 0, NULL);
|
|
goto out;
|
|
|
|
default:
|
|
len += sizeof(struct cp_header);
|
|
if (len > dev->mtu)
|
|
len = dev->mtu;
|
|
ppp_cp_event(dev, pid, RUC, 0, 0, len, cp);
|
|
goto out;
|
|
}
|
|
goto out;
|
|
|
|
rx_error:
|
|
dev->stats.rx_errors++;
|
|
out:
|
|
spin_unlock_irqrestore(&ppp->lock, flags);
|
|
dev_kfree_skb_any(skb);
|
|
ppp_tx_flush();
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
|
|
static void ppp_timer(unsigned long arg)
|
|
{
|
|
struct proto *proto = (struct proto *)arg;
|
|
struct ppp *ppp = get_ppp(proto->dev);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ppp->lock, flags);
|
|
switch (proto->state) {
|
|
case STOPPING:
|
|
case REQ_SENT:
|
|
case ACK_RECV:
|
|
case ACK_SENT:
|
|
if (proto->restart_counter) {
|
|
ppp_cp_event(proto->dev, proto->pid, TO_GOOD, 0, 0,
|
|
0, NULL);
|
|
proto->restart_counter--;
|
|
} else
|
|
ppp_cp_event(proto->dev, proto->pid, TO_BAD, 0, 0,
|
|
0, NULL);
|
|
break;
|
|
|
|
case OPENED:
|
|
if (proto->pid != PID_LCP)
|
|
break;
|
|
if (time_after(jiffies, ppp->last_pong +
|
|
ppp->keepalive_timeout * HZ)) {
|
|
printk(KERN_INFO "%s: Link down\n", proto->dev->name);
|
|
ppp_cp_event(proto->dev, PID_LCP, STOP, 0, 0, 0, NULL);
|
|
ppp_cp_event(proto->dev, PID_LCP, START, 0, 0, 0, NULL);
|
|
} else { /* send keep-alive packet */
|
|
ppp->echo_id = ++ppp->seq;
|
|
ppp_tx_cp(proto->dev, PID_LCP, LCP_ECHO_REQ,
|
|
ppp->echo_id, 0, NULL);
|
|
proto->timer.expires = jiffies +
|
|
ppp->keepalive_interval * HZ;
|
|
add_timer(&proto->timer);
|
|
}
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(&ppp->lock, flags);
|
|
ppp_tx_flush();
|
|
}
|
|
|
|
|
|
static void ppp_start(struct net_device *dev)
|
|
{
|
|
struct ppp *ppp = get_ppp(dev);
|
|
int i;
|
|
|
|
for (i = 0; i < IDX_COUNT; i++) {
|
|
struct proto *proto = &ppp->protos[i];
|
|
proto->dev = dev;
|
|
init_timer(&proto->timer);
|
|
proto->timer.function = ppp_timer;
|
|
proto->timer.data = (unsigned long)proto;
|
|
proto->state = CLOSED;
|
|
}
|
|
ppp->protos[IDX_LCP].pid = PID_LCP;
|
|
ppp->protos[IDX_IPCP].pid = PID_IPCP;
|
|
ppp->protos[IDX_IPV6CP].pid = PID_IPV6CP;
|
|
|
|
ppp_cp_event(dev, PID_LCP, START, 0, 0, 0, NULL);
|
|
}
|
|
|
|
static void ppp_stop(struct net_device *dev)
|
|
{
|
|
ppp_cp_event(dev, PID_LCP, STOP, 0, 0, 0, NULL);
|
|
}
|
|
|
|
static struct hdlc_proto proto = {
|
|
.start = ppp_start,
|
|
.stop = ppp_stop,
|
|
.type_trans = ppp_type_trans,
|
|
.ioctl = ppp_ioctl,
|
|
.netif_rx = ppp_rx,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
static const struct header_ops ppp_header_ops = {
|
|
.create = ppp_hard_header,
|
|
};
|
|
|
|
static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr)
|
|
{
|
|
hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
struct ppp *ppp;
|
|
int result;
|
|
|
|
switch (ifr->ifr_settings.type) {
|
|
case IF_GET_PROTO:
|
|
if (dev_to_hdlc(dev)->proto != &proto)
|
|
return -EINVAL;
|
|
ifr->ifr_settings.type = IF_PROTO_PPP;
|
|
return 0; /* return protocol only, no settable parameters */
|
|
|
|
case IF_PROTO_PPP:
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (dev->flags & IFF_UP)
|
|
return -EBUSY;
|
|
|
|
/* no settable parameters */
|
|
|
|
result = hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
|
|
if (result)
|
|
return result;
|
|
|
|
result = attach_hdlc_protocol(dev, &proto, sizeof(struct ppp));
|
|
if (result)
|
|
return result;
|
|
|
|
ppp = get_ppp(dev);
|
|
spin_lock_init(&ppp->lock);
|
|
ppp->req_timeout = 2;
|
|
ppp->cr_retries = 10;
|
|
ppp->term_retries = 2;
|
|
ppp->keepalive_interval = 10;
|
|
ppp->keepalive_timeout = 60;
|
|
|
|
dev->hard_start_xmit = hdlc->xmit;
|
|
dev->hard_header_len = sizeof(struct hdlc_header);
|
|
dev->header_ops = &ppp_header_ops;
|
|
dev->type = ARPHRD_PPP;
|
|
netif_dormant_on(dev);
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
static int __init mod_init(void)
|
|
{
|
|
skb_queue_head_init(&tx_queue);
|
|
register_hdlc_protocol(&proto);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit mod_exit(void)
|
|
{
|
|
unregister_hdlc_protocol(&proto);
|
|
}
|
|
|
|
|
|
module_init(mod_init);
|
|
module_exit(mod_exit);
|
|
|
|
MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
|
|
MODULE_DESCRIPTION("PPP protocol support for generic HDLC");
|
|
MODULE_LICENSE("GPL v2");
|