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725 lines
19 KiB
725 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Generic HDLC support routines for Linux |
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* Point-to-point protocol support |
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* |
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* Copyright (C) 1999 - 2008 Krzysztof Halasa <[email protected]> |
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*/ |
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#include <linux/errno.h> |
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#include <linux/hdlc.h> |
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#include <linux/if_arp.h> |
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#include <linux/inetdevice.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/pkt_sched.h> |
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#include <linux/poll.h> |
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#include <linux/skbuff.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#define DEBUG_CP 0 /* also bytes# to dump */ |
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#define DEBUG_STATE 0 |
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#define DEBUG_HARD_HEADER 0 |
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#define HDLC_ADDR_ALLSTATIONS 0xFF |
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#define HDLC_CTRL_UI 0x03 |
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#define PID_LCP 0xC021 |
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#define PID_IP 0x0021 |
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#define PID_IPCP 0x8021 |
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#define PID_IPV6 0x0057 |
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#define PID_IPV6CP 0x8057 |
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enum {IDX_LCP = 0, IDX_IPCP, IDX_IPV6CP, IDX_COUNT}; |
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enum {CP_CONF_REQ = 1, CP_CONF_ACK, CP_CONF_NAK, CP_CONF_REJ, CP_TERM_REQ, |
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CP_TERM_ACK, CP_CODE_REJ, LCP_PROTO_REJ, LCP_ECHO_REQ, LCP_ECHO_REPLY, |
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LCP_DISC_REQ, CP_CODES}; |
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#if DEBUG_CP |
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static const char *const code_names[CP_CODES] = { |
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"0", "ConfReq", "ConfAck", "ConfNak", "ConfRej", "TermReq", |
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"TermAck", "CodeRej", "ProtoRej", "EchoReq", "EchoReply", "Discard" |
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}; |
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static char debug_buffer[64 + 3 * DEBUG_CP]; |
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#endif |
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enum {LCP_OPTION_MRU = 1, LCP_OPTION_ACCM, LCP_OPTION_MAGIC = 5}; |
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struct hdlc_header { |
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u8 address; |
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u8 control; |
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__be16 protocol; |
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}; |
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struct cp_header { |
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u8 code; |
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u8 id; |
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__be16 len; |
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}; |
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struct proto { |
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struct net_device *dev; |
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struct timer_list timer; |
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unsigned long timeout; |
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u16 pid; /* protocol ID */ |
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u8 state; |
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u8 cr_id; /* ID of last Configuration-Request */ |
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u8 restart_counter; |
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}; |
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struct ppp { |
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struct proto protos[IDX_COUNT]; |
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spinlock_t lock; |
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unsigned long last_pong; |
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unsigned int req_timeout, cr_retries, term_retries; |
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unsigned int keepalive_interval, keepalive_timeout; |
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u8 seq; /* local sequence number for requests */ |
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u8 echo_id; /* ID of last Echo-Request (LCP) */ |
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}; |
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enum {CLOSED = 0, STOPPED, STOPPING, REQ_SENT, ACK_RECV, ACK_SENT, OPENED, |
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STATES, STATE_MASK = 0xF}; |
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enum {START = 0, STOP, TO_GOOD, TO_BAD, RCR_GOOD, RCR_BAD, RCA, RCN, RTR, RTA, |
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RUC, RXJ_GOOD, RXJ_BAD, EVENTS}; |
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enum {INV = 0x10, IRC = 0x20, ZRC = 0x40, SCR = 0x80, SCA = 0x100, |
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SCN = 0x200, STR = 0x400, STA = 0x800, SCJ = 0x1000}; |
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#if DEBUG_STATE |
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static const char *const state_names[STATES] = { |
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"Closed", "Stopped", "Stopping", "ReqSent", "AckRecv", "AckSent", |
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"Opened" |
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}; |
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static const char *const event_names[EVENTS] = { |
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"Start", "Stop", "TO+", "TO-", "RCR+", "RCR-", "RCA", "RCN", |
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"RTR", "RTA", "RUC", "RXJ+", "RXJ-" |
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}; |
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#endif |
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static struct sk_buff_head tx_queue; /* used when holding the spin lock */ |
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static int ppp_ioctl(struct net_device *dev, struct if_settings *ifs); |
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static inline struct ppp *get_ppp(struct net_device *dev) |
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{ |
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return (struct ppp *)dev_to_hdlc(dev)->state; |
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} |
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static inline struct proto *get_proto(struct net_device *dev, u16 pid) |
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{ |
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struct ppp *ppp = get_ppp(dev); |
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switch (pid) { |
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case PID_LCP: |
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return &ppp->protos[IDX_LCP]; |
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case PID_IPCP: |
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return &ppp->protos[IDX_IPCP]; |
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case PID_IPV6CP: |
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return &ppp->protos[IDX_IPV6CP]; |
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default: |
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return NULL; |
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} |
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} |
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static inline const char *proto_name(u16 pid) |
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{ |
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switch (pid) { |
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case PID_LCP: |
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return "LCP"; |
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case PID_IPCP: |
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return "IPCP"; |
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case PID_IPV6CP: |
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return "IPV6CP"; |
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default: |
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return NULL; |
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} |
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} |
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static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev) |
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{ |
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struct hdlc_header *data = (struct hdlc_header *)skb->data; |
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if (skb->len < sizeof(struct hdlc_header)) |
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return htons(ETH_P_HDLC); |
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if (data->address != HDLC_ADDR_ALLSTATIONS || |
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data->control != HDLC_CTRL_UI) |
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return htons(ETH_P_HDLC); |
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switch (data->protocol) { |
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case cpu_to_be16(PID_IP): |
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skb_pull(skb, sizeof(struct hdlc_header)); |
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return htons(ETH_P_IP); |
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case cpu_to_be16(PID_IPV6): |
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skb_pull(skb, sizeof(struct hdlc_header)); |
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return htons(ETH_P_IPV6); |
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default: |
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return htons(ETH_P_HDLC); |
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} |
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} |
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static int ppp_hard_header(struct sk_buff *skb, struct net_device *dev, |
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u16 type, const void *daddr, const void *saddr, |
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unsigned int len) |
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{ |
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struct hdlc_header *data; |
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#if DEBUG_HARD_HEADER |
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printk(KERN_DEBUG "%s: ppp_hard_header() called\n", dev->name); |
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#endif |
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skb_push(skb, sizeof(struct hdlc_header)); |
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data = (struct hdlc_header *)skb->data; |
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data->address = HDLC_ADDR_ALLSTATIONS; |
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data->control = HDLC_CTRL_UI; |
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switch (type) { |
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case ETH_P_IP: |
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data->protocol = htons(PID_IP); |
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break; |
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case ETH_P_IPV6: |
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data->protocol = htons(PID_IPV6); |
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break; |
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case PID_LCP: |
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case PID_IPCP: |
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case PID_IPV6CP: |
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data->protocol = htons(type); |
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break; |
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default: /* unknown protocol */ |
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data->protocol = 0; |
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} |
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return sizeof(struct hdlc_header); |
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} |
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static void ppp_tx_flush(void) |
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{ |
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struct sk_buff *skb; |
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while ((skb = skb_dequeue(&tx_queue)) != NULL) |
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dev_queue_xmit(skb); |
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} |
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static void ppp_tx_cp(struct net_device *dev, u16 pid, u8 code, |
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u8 id, unsigned int len, const void *data) |
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{ |
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struct sk_buff *skb; |
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struct cp_header *cp; |
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unsigned int magic_len = 0; |
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static u32 magic; |
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#if DEBUG_CP |
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int i; |
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char *ptr; |
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#endif |
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if (pid == PID_LCP && (code == LCP_ECHO_REQ || code == LCP_ECHO_REPLY)) |
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magic_len = sizeof(magic); |
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skb = dev_alloc_skb(sizeof(struct hdlc_header) + |
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sizeof(struct cp_header) + magic_len + len); |
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if (!skb) |
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return; |
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skb_reserve(skb, sizeof(struct hdlc_header)); |
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cp = skb_put(skb, sizeof(struct cp_header)); |
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cp->code = code; |
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cp->id = id; |
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cp->len = htons(sizeof(struct cp_header) + magic_len + len); |
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if (magic_len) |
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skb_put_data(skb, &magic, magic_len); |
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if (len) |
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skb_put_data(skb, data, len); |
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#if DEBUG_CP |
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BUG_ON(code >= CP_CODES); |
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ptr = debug_buffer; |
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*ptr = '\x0'; |
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for (i = 0; i < min_t(unsigned int, magic_len + len, DEBUG_CP); i++) { |
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sprintf(ptr, " %02X", skb->data[sizeof(struct cp_header) + i]); |
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ptr += strlen(ptr); |
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} |
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printk(KERN_DEBUG "%s: TX %s [%s id 0x%X]%s\n", dev->name, |
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proto_name(pid), code_names[code], id, debug_buffer); |
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#endif |
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ppp_hard_header(skb, dev, pid, NULL, NULL, 0); |
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skb->priority = TC_PRIO_CONTROL; |
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skb->dev = dev; |
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skb->protocol = htons(ETH_P_HDLC); |
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skb_reset_network_header(skb); |
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skb_queue_tail(&tx_queue, skb); |
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} |
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/* State transition table (compare STD-51) |
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Events Actions |
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TO+ = Timeout with counter > 0 irc = Initialize-Restart-Count |
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TO- = Timeout with counter expired zrc = Zero-Restart-Count |
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RCR+ = Receive-Configure-Request (Good) scr = Send-Configure-Request |
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RCR- = Receive-Configure-Request (Bad) |
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RCA = Receive-Configure-Ack sca = Send-Configure-Ack |
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RCN = Receive-Configure-Nak/Rej scn = Send-Configure-Nak/Rej |
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RTR = Receive-Terminate-Request str = Send-Terminate-Request |
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RTA = Receive-Terminate-Ack sta = Send-Terminate-Ack |
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RUC = Receive-Unknown-Code scj = Send-Code-Reject |
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RXJ+ = Receive-Code-Reject (permitted) |
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or Receive-Protocol-Reject |
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RXJ- = Receive-Code-Reject (catastrophic) |
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or Receive-Protocol-Reject |
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*/ |
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static int cp_table[EVENTS][STATES] = { |
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/* CLOSED STOPPED STOPPING REQ_SENT ACK_RECV ACK_SENT OPENED |
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0 1 2 3 4 5 6 */ |
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{IRC|SCR|3, INV , INV , INV , INV , INV , INV }, /* START */ |
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{ INV , 0 , 0 , 0 , 0 , 0 , 0 }, /* STOP */ |
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{ INV , INV ,STR|2, SCR|3 ,SCR|3, SCR|5 , INV }, /* TO+ */ |
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{ INV , INV , 1 , 1 , 1 , 1 , INV }, /* TO- */ |
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{ STA|0 ,IRC|SCR|SCA|5, 2 , SCA|5 ,SCA|6, SCA|5 ,SCR|SCA|5}, /* RCR+ */ |
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{ STA|0 ,IRC|SCR|SCN|3, 2 , SCN|3 ,SCN|4, SCN|3 ,SCR|SCN|3}, /* RCR- */ |
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{ STA|0 , STA|1 , 2 , IRC|4 ,SCR|3, 6 , SCR|3 }, /* RCA */ |
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{ STA|0 , STA|1 , 2 ,IRC|SCR|3,SCR|3,IRC|SCR|5, SCR|3 }, /* RCN */ |
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{ STA|0 , STA|1 ,STA|2, STA|3 ,STA|3, STA|3 ,ZRC|STA|2}, /* RTR */ |
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{ 0 , 1 , 1 , 3 , 3 , 5 , SCR|3 }, /* RTA */ |
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{ SCJ|0 , SCJ|1 ,SCJ|2, SCJ|3 ,SCJ|4, SCJ|5 , SCJ|6 }, /* RUC */ |
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{ 0 , 1 , 2 , 3 , 3 , 5 , 6 }, /* RXJ+ */ |
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{ 0 , 1 , 1 , 1 , 1 , 1 ,IRC|STR|2}, /* RXJ- */ |
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}; |
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/* SCA: RCR+ must supply id, len and data |
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SCN: RCR- must supply code, id, len and data |
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STA: RTR must supply id |
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SCJ: RUC must supply CP packet len and data */ |
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static void ppp_cp_event(struct net_device *dev, u16 pid, u16 event, u8 code, |
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u8 id, unsigned int len, const void *data) |
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{ |
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int old_state, action; |
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struct ppp *ppp = get_ppp(dev); |
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struct proto *proto = get_proto(dev, pid); |
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old_state = proto->state; |
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BUG_ON(old_state >= STATES); |
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BUG_ON(event >= EVENTS); |
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#if DEBUG_STATE |
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printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) %s ...\n", dev->name, |
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proto_name(pid), event_names[event], state_names[proto->state]); |
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#endif |
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action = cp_table[event][old_state]; |
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proto->state = action & STATE_MASK; |
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if (action & (SCR | STR)) /* set Configure-Req/Terminate-Req timer */ |
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mod_timer(&proto->timer, proto->timeout = |
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jiffies + ppp->req_timeout * HZ); |
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if (action & ZRC) |
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proto->restart_counter = 0; |
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if (action & IRC) |
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proto->restart_counter = (proto->state == STOPPING) ? |
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ppp->term_retries : ppp->cr_retries; |
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if (action & SCR) /* send Configure-Request */ |
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ppp_tx_cp(dev, pid, CP_CONF_REQ, proto->cr_id = ++ppp->seq, |
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0, NULL); |
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if (action & SCA) /* send Configure-Ack */ |
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ppp_tx_cp(dev, pid, CP_CONF_ACK, id, len, data); |
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if (action & SCN) /* send Configure-Nak/Reject */ |
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ppp_tx_cp(dev, pid, code, id, len, data); |
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if (action & STR) /* send Terminate-Request */ |
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ppp_tx_cp(dev, pid, CP_TERM_REQ, ++ppp->seq, 0, NULL); |
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if (action & STA) /* send Terminate-Ack */ |
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ppp_tx_cp(dev, pid, CP_TERM_ACK, id, 0, NULL); |
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if (action & SCJ) /* send Code-Reject */ |
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ppp_tx_cp(dev, pid, CP_CODE_REJ, ++ppp->seq, len, data); |
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if (old_state != OPENED && proto->state == OPENED) { |
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netdev_info(dev, "%s up\n", proto_name(pid)); |
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if (pid == PID_LCP) { |
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netif_dormant_off(dev); |
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ppp_cp_event(dev, PID_IPCP, START, 0, 0, 0, NULL); |
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ppp_cp_event(dev, PID_IPV6CP, START, 0, 0, 0, NULL); |
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ppp->last_pong = jiffies; |
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mod_timer(&proto->timer, proto->timeout = |
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jiffies + ppp->keepalive_interval * HZ); |
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} |
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} |
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if (old_state == OPENED && proto->state != OPENED) { |
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netdev_info(dev, "%s down\n", proto_name(pid)); |
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if (pid == PID_LCP) { |
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netif_dormant_on(dev); |
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ppp_cp_event(dev, PID_IPCP, STOP, 0, 0, 0, NULL); |
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ppp_cp_event(dev, PID_IPV6CP, STOP, 0, 0, 0, NULL); |
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} |
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} |
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if (old_state != CLOSED && proto->state == CLOSED) |
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del_timer(&proto->timer); |
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#if DEBUG_STATE |
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printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) ... %s\n", dev->name, |
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proto_name(pid), event_names[event], state_names[proto->state]); |
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#endif |
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} |
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static void ppp_cp_parse_cr(struct net_device *dev, u16 pid, u8 id, |
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unsigned int req_len, const u8 *data) |
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{ |
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static u8 const valid_accm[6] = { LCP_OPTION_ACCM, 6, 0, 0, 0, 0 }; |
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const u8 *opt; |
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u8 *out; |
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unsigned int len = req_len, nak_len = 0, rej_len = 0; |
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out = kmalloc(len, GFP_ATOMIC); |
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if (!out) { |
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dev->stats.rx_dropped++; |
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return; /* out of memory, ignore CR packet */ |
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} |
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for (opt = data; len; len -= opt[1], opt += opt[1]) { |
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if (len < 2 || opt[1] < 2 || len < opt[1]) |
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goto err_out; |
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if (pid == PID_LCP) |
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switch (opt[0]) { |
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case LCP_OPTION_MRU: |
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continue; /* MRU always OK and > 1500 bytes? */ |
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|
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case LCP_OPTION_ACCM: /* async control character map */ |
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if (opt[1] < sizeof(valid_accm)) |
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goto err_out; |
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if (!memcmp(opt, valid_accm, |
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sizeof(valid_accm))) |
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continue; |
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if (!rej_len) { /* NAK it */ |
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memcpy(out + nak_len, valid_accm, |
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sizeof(valid_accm)); |
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nak_len += sizeof(valid_accm); |
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continue; |
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} |
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break; |
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case LCP_OPTION_MAGIC: |
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if (len < 6) |
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goto err_out; |
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if (opt[1] != 6 || (!opt[2] && !opt[3] && |
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!opt[4] && !opt[5])) |
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break; /* reject invalid magic number */ |
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continue; |
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} |
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/* reject this option */ |
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memcpy(out + rej_len, opt, opt[1]); |
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rej_len += opt[1]; |
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} |
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if (rej_len) |
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ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_REJ, id, rej_len, out); |
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else if (nak_len) |
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ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_NAK, id, nak_len, out); |
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else |
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ppp_cp_event(dev, pid, RCR_GOOD, CP_CONF_ACK, id, req_len, data); |
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kfree(out); |
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return; |
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err_out: |
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dev->stats.rx_errors++; |
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kfree(out); |
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} |
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static int ppp_rx(struct sk_buff *skb) |
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{ |
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struct hdlc_header *hdr = (struct hdlc_header *)skb->data; |
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struct net_device *dev = skb->dev; |
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struct ppp *ppp = get_ppp(dev); |
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struct proto *proto; |
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struct cp_header *cp; |
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unsigned long flags; |
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unsigned int len; |
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u16 pid; |
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#if DEBUG_CP |
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int i; |
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char *ptr; |
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#endif |
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spin_lock_irqsave(&ppp->lock, flags); |
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/* Check HDLC header */ |
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if (skb->len < sizeof(struct hdlc_header)) |
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goto rx_error; |
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cp = skb_pull(skb, sizeof(struct hdlc_header)); |
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if (hdr->address != HDLC_ADDR_ALLSTATIONS || |
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hdr->control != HDLC_CTRL_UI) |
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goto rx_error; |
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pid = ntohs(hdr->protocol); |
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proto = get_proto(dev, pid); |
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if (!proto) { |
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if (ppp->protos[IDX_LCP].state == OPENED) |
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ppp_tx_cp(dev, PID_LCP, LCP_PROTO_REJ, |
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++ppp->seq, skb->len + 2, &hdr->protocol); |
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goto rx_error; |
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} |
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len = ntohs(cp->len); |
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if (len < sizeof(struct cp_header) /* no complete CP header? */ || |
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skb->len < len /* truncated packet? */) |
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goto rx_error; |
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skb_pull(skb, sizeof(struct cp_header)); |
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len -= sizeof(struct cp_header); |
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|
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/* HDLC and CP headers stripped from skb */ |
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#if DEBUG_CP |
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if (cp->code < CP_CODES) |
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sprintf(debug_buffer, "[%s id 0x%X]", code_names[cp->code], |
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cp->id); |
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else |
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sprintf(debug_buffer, "[code %u id 0x%X]", cp->code, cp->id); |
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ptr = debug_buffer + strlen(debug_buffer); |
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for (i = 0; i < min_t(unsigned int, len, DEBUG_CP); i++) { |
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sprintf(ptr, " %02X", skb->data[i]); |
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ptr += strlen(ptr); |
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} |
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printk(KERN_DEBUG "%s: RX %s %s\n", dev->name, proto_name(pid), |
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debug_buffer); |
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#endif |
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/* LCP only */ |
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if (pid == PID_LCP) |
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switch (cp->code) { |
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case LCP_PROTO_REJ: |
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pid = ntohs(*(__be16 *)skb->data); |
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if (pid == PID_LCP || pid == PID_IPCP || |
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pid == PID_IPV6CP) |
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ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, |
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0, NULL); |
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goto out; |
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|
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case LCP_ECHO_REQ: /* send Echo-Reply */ |
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if (len >= 4 && proto->state == OPENED) |
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ppp_tx_cp(dev, PID_LCP, LCP_ECHO_REPLY, |
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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); |
|
break; |
|
|
|
case CP_CONF_ACK: |
|
if (cp->id == proto->cr_id) |
|
ppp_cp_event(dev, pid, RCA, 0, 0, 0, NULL); |
|
break; |
|
|
|
case CP_CONF_REJ: |
|
case CP_CONF_NAK: |
|
if (cp->id == proto->cr_id) |
|
ppp_cp_event(dev, pid, RCN, 0, 0, 0, NULL); |
|
break; |
|
|
|
case CP_TERM_REQ: |
|
ppp_cp_event(dev, pid, RTR, 0, cp->id, 0, NULL); |
|
break; |
|
|
|
case CP_TERM_ACK: |
|
ppp_cp_event(dev, pid, RTA, 0, 0, 0, NULL); |
|
break; |
|
|
|
case CP_CODE_REJ: |
|
ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, 0, NULL); |
|
break; |
|
|
|
default: |
|
len += sizeof(struct cp_header); |
|
if (len > dev->mtu) |
|
len = dev->mtu; |
|
ppp_cp_event(dev, pid, RUC, 0, 0, len, cp); |
|
break; |
|
} |
|
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(struct timer_list *t) |
|
{ |
|
struct proto *proto = from_timer(proto, t, timer); |
|
struct ppp *ppp = get_ppp(proto->dev); |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&ppp->lock, flags); |
|
/* mod_timer could be called after we entered this function but |
|
* before we got the lock. |
|
*/ |
|
if (timer_pending(&proto->timer)) { |
|
spin_unlock_irqrestore(&ppp->lock, flags); |
|
return; |
|
} |
|
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 if (netif_carrier_ok(proto->dev)) |
|
ppp_cp_event(proto->dev, proto->pid, TO_GOOD, 0, 0, |
|
0, NULL); |
|
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)) { |
|
netdev_info(proto->dev, "Link down\n"); |
|
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; |
|
timer_setup(&proto->timer, ppp_timer, 0); |
|
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 void ppp_close(struct net_device *dev) |
|
{ |
|
ppp_tx_flush(); |
|
} |
|
|
|
static struct hdlc_proto proto = { |
|
.start = ppp_start, |
|
.stop = ppp_stop, |
|
.close = ppp_close, |
|
.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 if_settings *ifs) |
|
{ |
|
hdlc_device *hdlc = dev_to_hdlc(dev); |
|
struct ppp *ppp; |
|
int result; |
|
|
|
switch (ifs->type) { |
|
case IF_GET_PROTO: |
|
if (dev_to_hdlc(dev)->proto != &proto) |
|
return -EINVAL; |
|
ifs->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_header_len = sizeof(struct hdlc_header); |
|
dev->header_ops = &ppp_header_ops; |
|
dev->type = ARPHRD_PPP; |
|
call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); |
|
netif_dormant_on(dev); |
|
return 0; |
|
} |
|
|
|
return -EINVAL; |
|
} |
|
|
|
static int __init hdlc_ppp_init(void) |
|
{ |
|
skb_queue_head_init(&tx_queue); |
|
register_hdlc_protocol(&proto); |
|
return 0; |
|
} |
|
|
|
static void __exit hdlc_ppp_exit(void) |
|
{ |
|
unregister_hdlc_protocol(&proto); |
|
} |
|
|
|
module_init(hdlc_ppp_init); |
|
module_exit(hdlc_ppp_exit); |
|
|
|
MODULE_AUTHOR("Krzysztof Halasa <[email protected]>"); |
|
MODULE_DESCRIPTION("PPP protocol support for generic HDLC"); |
|
MODULE_LICENSE("GPL v2");
|
|
|