| /* |
| * 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, const 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 req_len, const u8 *data) |
| { |
| static u8 const valid_accm[6] = { LCP_OPTION_ACCM, 6, 0, 0, 0, 0 }; |
| const u8 *opt; |
| u8 *out; |
| unsigned int len = req_len, 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, req_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"); |