1312 lines
30 KiB
C
1312 lines
30 KiB
C
/*
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* Generic HDLC support routines for Linux
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* Frame Relay support
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*
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* Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*
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Theory of PVC state
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DCE mode:
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(exist,new) -> 0,0 when "PVC create" or if "link unreliable"
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0,x -> 1,1 if "link reliable" when sending FULL STATUS
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1,1 -> 1,0 if received FULL STATUS ACK
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(active) -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"
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-> 1 when "PVC up" and (exist,new) = 1,0
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DTE mode:
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(exist,new,active) = FULL STATUS if "link reliable"
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= 0, 0, 0 if "link unreliable"
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No LMI:
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active = open and "link reliable"
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exist = new = not used
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CCITT LMI: ITU-T Q.933 Annex A
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ANSI LMI: ANSI T1.617 Annex D
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CISCO LMI: the original, aka "Gang of Four" LMI
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*/
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#include <linux/errno.h>
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#include <linux/etherdevice.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/rtnetlink.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#undef DEBUG_PKT
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#undef DEBUG_ECN
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#undef DEBUG_LINK
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#undef DEBUG_PROTO
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#undef DEBUG_PVC
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#define FR_UI 0x03
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#define FR_PAD 0x00
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#define NLPID_IP 0xCC
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#define NLPID_IPV6 0x8E
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#define NLPID_SNAP 0x80
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#define NLPID_PAD 0x00
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#define NLPID_CCITT_ANSI_LMI 0x08
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#define NLPID_CISCO_LMI 0x09
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#define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */
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#define LMI_CISCO_DLCI 1023
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#define LMI_CALLREF 0x00 /* Call Reference */
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#define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */
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#define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */
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#define LMI_CCITT_REPTYPE 0x51
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#define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */
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#define LMI_CCITT_ALIVE 0x53
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#define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */
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#define LMI_CCITT_PVCSTAT 0x57
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#define LMI_FULLREP 0x00 /* full report */
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#define LMI_INTEGRITY 0x01 /* link integrity report */
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#define LMI_SINGLE 0x02 /* single PVC report */
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#define LMI_STATUS_ENQUIRY 0x75
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#define LMI_STATUS 0x7D /* reply */
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#define LMI_REPT_LEN 1 /* report type element length */
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#define LMI_INTEG_LEN 2 /* link integrity element length */
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#define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */
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#define LMI_ANSI_LENGTH 14
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typedef struct {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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unsigned ea1: 1;
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unsigned cr: 1;
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unsigned dlcih: 6;
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unsigned ea2: 1;
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unsigned de: 1;
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unsigned becn: 1;
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unsigned fecn: 1;
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unsigned dlcil: 4;
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#else
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unsigned dlcih: 6;
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unsigned cr: 1;
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unsigned ea1: 1;
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unsigned dlcil: 4;
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unsigned fecn: 1;
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unsigned becn: 1;
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unsigned de: 1;
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unsigned ea2: 1;
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#endif
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}__attribute__ ((packed)) fr_hdr;
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typedef struct pvc_device_struct {
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struct net_device *frad;
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struct net_device *main;
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struct net_device *ether; /* bridged Ethernet interface */
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struct pvc_device_struct *next; /* Sorted in ascending DLCI order */
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int dlci;
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int open_count;
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struct {
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unsigned int new: 1;
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unsigned int active: 1;
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unsigned int exist: 1;
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unsigned int deleted: 1;
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unsigned int fecn: 1;
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unsigned int becn: 1;
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unsigned int bandwidth; /* Cisco LMI reporting only */
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}state;
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}pvc_device;
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struct frad_state {
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fr_proto settings;
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pvc_device *first_pvc;
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int dce_pvc_count;
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struct timer_list timer;
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unsigned long last_poll;
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int reliable;
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int dce_changed;
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int request;
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int fullrep_sent;
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u32 last_errors; /* last errors bit list */
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u8 n391cnt;
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u8 txseq; /* TX sequence number */
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u8 rxseq; /* RX sequence number */
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};
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static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
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static inline u16 q922_to_dlci(u8 *hdr)
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{
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return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
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}
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static inline void dlci_to_q922(u8 *hdr, u16 dlci)
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{
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hdr[0] = (dlci >> 2) & 0xFC;
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hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
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}
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static inline struct frad_state* state(hdlc_device *hdlc)
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{
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return(struct frad_state *)(hdlc->state);
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}
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static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
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{
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pvc_device *pvc = state(hdlc)->first_pvc;
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while (pvc) {
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if (pvc->dlci == dlci)
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return pvc;
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if (pvc->dlci > dlci)
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return NULL; /* the listed is sorted */
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pvc = pvc->next;
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}
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return NULL;
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}
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static pvc_device* add_pvc(struct net_device *dev, u16 dlci)
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{
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hdlc_device *hdlc = dev_to_hdlc(dev);
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pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
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while (*pvc_p) {
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if ((*pvc_p)->dlci == dlci)
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return *pvc_p;
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if ((*pvc_p)->dlci > dlci)
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break; /* the list is sorted */
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pvc_p = &(*pvc_p)->next;
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}
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pvc = kzalloc(sizeof(pvc_device), GFP_ATOMIC);
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#ifdef DEBUG_PVC
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printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
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#endif
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if (!pvc)
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return NULL;
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pvc->dlci = dlci;
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pvc->frad = dev;
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pvc->next = *pvc_p; /* Put it in the chain */
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*pvc_p = pvc;
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return pvc;
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}
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static inline int pvc_is_used(pvc_device *pvc)
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{
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return pvc->main || pvc->ether;
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}
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static inline void pvc_carrier(int on, pvc_device *pvc)
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{
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if (on) {
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if (pvc->main)
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if (!netif_carrier_ok(pvc->main))
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netif_carrier_on(pvc->main);
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if (pvc->ether)
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if (!netif_carrier_ok(pvc->ether))
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netif_carrier_on(pvc->ether);
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} else {
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if (pvc->main)
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if (netif_carrier_ok(pvc->main))
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netif_carrier_off(pvc->main);
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if (pvc->ether)
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if (netif_carrier_ok(pvc->ether))
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netif_carrier_off(pvc->ether);
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}
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}
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static inline void delete_unused_pvcs(hdlc_device *hdlc)
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{
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pvc_device **pvc_p = &state(hdlc)->first_pvc;
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while (*pvc_p) {
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if (!pvc_is_used(*pvc_p)) {
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pvc_device *pvc = *pvc_p;
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#ifdef DEBUG_PVC
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printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
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#endif
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*pvc_p = pvc->next;
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kfree(pvc);
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continue;
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}
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pvc_p = &(*pvc_p)->next;
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}
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}
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static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
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{
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if (type == ARPHRD_ETHER)
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return &pvc->ether;
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else
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return &pvc->main;
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}
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static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
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{
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u16 head_len;
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struct sk_buff *skb = *skb_p;
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switch (skb->protocol) {
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case cpu_to_be16(NLPID_CCITT_ANSI_LMI):
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head_len = 4;
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skb_push(skb, head_len);
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skb->data[3] = NLPID_CCITT_ANSI_LMI;
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break;
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case cpu_to_be16(NLPID_CISCO_LMI):
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head_len = 4;
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skb_push(skb, head_len);
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skb->data[3] = NLPID_CISCO_LMI;
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break;
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case cpu_to_be16(ETH_P_IP):
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head_len = 4;
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skb_push(skb, head_len);
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skb->data[3] = NLPID_IP;
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break;
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case cpu_to_be16(ETH_P_IPV6):
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head_len = 4;
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skb_push(skb, head_len);
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skb->data[3] = NLPID_IPV6;
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break;
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case cpu_to_be16(ETH_P_802_3):
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head_len = 10;
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if (skb_headroom(skb) < head_len) {
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struct sk_buff *skb2 = skb_realloc_headroom(skb,
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head_len);
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if (!skb2)
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return -ENOBUFS;
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dev_kfree_skb(skb);
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skb = *skb_p = skb2;
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}
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skb_push(skb, head_len);
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skb->data[3] = FR_PAD;
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skb->data[4] = NLPID_SNAP;
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skb->data[5] = FR_PAD;
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skb->data[6] = 0x80;
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skb->data[7] = 0xC2;
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skb->data[8] = 0x00;
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skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
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break;
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default:
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head_len = 10;
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skb_push(skb, head_len);
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skb->data[3] = FR_PAD;
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skb->data[4] = NLPID_SNAP;
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skb->data[5] = FR_PAD;
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skb->data[6] = FR_PAD;
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skb->data[7] = FR_PAD;
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*(__be16*)(skb->data + 8) = skb->protocol;
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}
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dlci_to_q922(skb->data, dlci);
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skb->data[2] = FR_UI;
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return 0;
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}
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static int pvc_open(struct net_device *dev)
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{
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pvc_device *pvc = dev->ml_priv;
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if ((pvc->frad->flags & IFF_UP) == 0)
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return -EIO; /* Frad must be UP in order to activate PVC */
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if (pvc->open_count++ == 0) {
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hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
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if (state(hdlc)->settings.lmi == LMI_NONE)
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pvc->state.active = netif_carrier_ok(pvc->frad);
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pvc_carrier(pvc->state.active, pvc);
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state(hdlc)->dce_changed = 1;
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}
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return 0;
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}
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static int pvc_close(struct net_device *dev)
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{
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pvc_device *pvc = dev->ml_priv;
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if (--pvc->open_count == 0) {
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hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
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if (state(hdlc)->settings.lmi == LMI_NONE)
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pvc->state.active = 0;
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if (state(hdlc)->settings.dce) {
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state(hdlc)->dce_changed = 1;
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pvc->state.active = 0;
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}
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}
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return 0;
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}
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static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
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{
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pvc_device *pvc = dev->ml_priv;
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fr_proto_pvc_info info;
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if (ifr->ifr_settings.type == IF_GET_PROTO) {
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if (dev->type == ARPHRD_ETHER)
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ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
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else
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ifr->ifr_settings.type = IF_PROTO_FR_PVC;
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if (ifr->ifr_settings.size < sizeof(info)) {
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/* data size wanted */
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ifr->ifr_settings.size = sizeof(info);
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return -ENOBUFS;
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}
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info.dlci = pvc->dlci;
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memcpy(info.master, pvc->frad->name, IFNAMSIZ);
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if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
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&info, sizeof(info)))
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return -EFAULT;
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return 0;
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}
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return -EINVAL;
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}
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static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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pvc_device *pvc = dev->ml_priv;
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if (pvc->state.active) {
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if (dev->type == ARPHRD_ETHER) {
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int pad = ETH_ZLEN - skb->len;
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if (pad > 0) { /* Pad the frame with zeros */
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int len = skb->len;
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if (skb_tailroom(skb) < pad)
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if (pskb_expand_head(skb, 0, pad,
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GFP_ATOMIC)) {
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dev->stats.tx_dropped++;
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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skb_put(skb, pad);
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memset(skb->data + len, 0, pad);
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}
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skb->protocol = cpu_to_be16(ETH_P_802_3);
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}
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if (!fr_hard_header(&skb, pvc->dlci)) {
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dev->stats.tx_bytes += skb->len;
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dev->stats.tx_packets++;
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if (pvc->state.fecn) /* TX Congestion counter */
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dev->stats.tx_compressed++;
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skb->dev = pvc->frad;
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dev_queue_xmit(skb);
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return NETDEV_TX_OK;
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}
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}
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dev->stats.tx_dropped++;
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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static inline void fr_log_dlci_active(pvc_device *pvc)
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{
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printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
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pvc->frad->name,
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pvc->dlci,
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pvc->main ? pvc->main->name : "",
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pvc->main && pvc->ether ? " " : "",
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pvc->ether ? pvc->ether->name : "",
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pvc->state.new ? " new" : "",
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!pvc->state.exist ? "deleted" :
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pvc->state.active ? "active" : "inactive");
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}
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static inline u8 fr_lmi_nextseq(u8 x)
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{
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x++;
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return x ? x : 1;
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}
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static void fr_lmi_send(struct net_device *dev, int fullrep)
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{
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hdlc_device *hdlc = dev_to_hdlc(dev);
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struct sk_buff *skb;
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pvc_device *pvc = state(hdlc)->first_pvc;
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int lmi = state(hdlc)->settings.lmi;
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int dce = state(hdlc)->settings.dce;
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int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
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int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
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u8 *data;
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int i = 0;
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if (dce && fullrep) {
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len += state(hdlc)->dce_pvc_count * (2 + stat_len);
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if (len > HDLC_MAX_MRU) {
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printk(KERN_WARNING "%s: Too many PVCs while sending "
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"LMI full report\n", dev->name);
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return;
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}
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}
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skb = dev_alloc_skb(len);
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if (!skb) {
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printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
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dev->name);
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return;
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}
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memset(skb->data, 0, len);
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skb_reserve(skb, 4);
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if (lmi == LMI_CISCO) {
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skb->protocol = cpu_to_be16(NLPID_CISCO_LMI);
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fr_hard_header(&skb, LMI_CISCO_DLCI);
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} else {
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skb->protocol = cpu_to_be16(NLPID_CCITT_ANSI_LMI);
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fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
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}
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data = skb_tail_pointer(skb);
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data[i++] = LMI_CALLREF;
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data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
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if (lmi == LMI_ANSI)
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data[i++] = LMI_ANSI_LOCKSHIFT;
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data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
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LMI_ANSI_CISCO_REPTYPE;
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data[i++] = LMI_REPT_LEN;
|
|
data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
|
|
data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
|
|
data[i++] = LMI_INTEG_LEN;
|
|
data[i++] = state(hdlc)->txseq =
|
|
fr_lmi_nextseq(state(hdlc)->txseq);
|
|
data[i++] = state(hdlc)->rxseq;
|
|
|
|
if (dce && fullrep) {
|
|
while (pvc) {
|
|
data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
|
|
LMI_ANSI_CISCO_PVCSTAT;
|
|
data[i++] = stat_len;
|
|
|
|
/* LMI start/restart */
|
|
if (state(hdlc)->reliable && !pvc->state.exist) {
|
|
pvc->state.exist = pvc->state.new = 1;
|
|
fr_log_dlci_active(pvc);
|
|
}
|
|
|
|
/* ifconfig PVC up */
|
|
if (pvc->open_count && !pvc->state.active &&
|
|
pvc->state.exist && !pvc->state.new) {
|
|
pvc_carrier(1, pvc);
|
|
pvc->state.active = 1;
|
|
fr_log_dlci_active(pvc);
|
|
}
|
|
|
|
if (lmi == LMI_CISCO) {
|
|
data[i] = pvc->dlci >> 8;
|
|
data[i + 1] = pvc->dlci & 0xFF;
|
|
} else {
|
|
data[i] = (pvc->dlci >> 4) & 0x3F;
|
|
data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
|
|
data[i + 2] = 0x80;
|
|
}
|
|
|
|
if (pvc->state.new)
|
|
data[i + 2] |= 0x08;
|
|
else if (pvc->state.active)
|
|
data[i + 2] |= 0x02;
|
|
|
|
i += stat_len;
|
|
pvc = pvc->next;
|
|
}
|
|
}
|
|
|
|
skb_put(skb, i);
|
|
skb->priority = TC_PRIO_CONTROL;
|
|
skb->dev = dev;
|
|
skb_reset_network_header(skb);
|
|
|
|
dev_queue_xmit(skb);
|
|
}
|
|
|
|
|
|
|
|
static void fr_set_link_state(int reliable, struct net_device *dev)
|
|
{
|
|
hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
pvc_device *pvc = state(hdlc)->first_pvc;
|
|
|
|
state(hdlc)->reliable = reliable;
|
|
if (reliable) {
|
|
netif_dormant_off(dev);
|
|
state(hdlc)->n391cnt = 0; /* Request full status */
|
|
state(hdlc)->dce_changed = 1;
|
|
|
|
if (state(hdlc)->settings.lmi == LMI_NONE) {
|
|
while (pvc) { /* Activate all PVCs */
|
|
pvc_carrier(1, pvc);
|
|
pvc->state.exist = pvc->state.active = 1;
|
|
pvc->state.new = 0;
|
|
pvc = pvc->next;
|
|
}
|
|
}
|
|
} else {
|
|
netif_dormant_on(dev);
|
|
while (pvc) { /* Deactivate all PVCs */
|
|
pvc_carrier(0, pvc);
|
|
pvc->state.exist = pvc->state.active = 0;
|
|
pvc->state.new = 0;
|
|
if (!state(hdlc)->settings.dce)
|
|
pvc->state.bandwidth = 0;
|
|
pvc = pvc->next;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void fr_timer(unsigned long arg)
|
|
{
|
|
struct net_device *dev = (struct net_device *)arg;
|
|
hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
int i, cnt = 0, reliable;
|
|
u32 list;
|
|
|
|
if (state(hdlc)->settings.dce) {
|
|
reliable = state(hdlc)->request &&
|
|
time_before(jiffies, state(hdlc)->last_poll +
|
|
state(hdlc)->settings.t392 * HZ);
|
|
state(hdlc)->request = 0;
|
|
} else {
|
|
state(hdlc)->last_errors <<= 1; /* Shift the list */
|
|
if (state(hdlc)->request) {
|
|
if (state(hdlc)->reliable)
|
|
printk(KERN_INFO "%s: No LMI status reply "
|
|
"received\n", dev->name);
|
|
state(hdlc)->last_errors |= 1;
|
|
}
|
|
|
|
list = state(hdlc)->last_errors;
|
|
for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
|
|
cnt += (list & 1); /* errors count */
|
|
|
|
reliable = (cnt < state(hdlc)->settings.n392);
|
|
}
|
|
|
|
if (state(hdlc)->reliable != reliable) {
|
|
printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
|
|
reliable ? "" : "un");
|
|
fr_set_link_state(reliable, dev);
|
|
}
|
|
|
|
if (state(hdlc)->settings.dce)
|
|
state(hdlc)->timer.expires = jiffies +
|
|
state(hdlc)->settings.t392 * HZ;
|
|
else {
|
|
if (state(hdlc)->n391cnt)
|
|
state(hdlc)->n391cnt--;
|
|
|
|
fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
|
|
|
|
state(hdlc)->last_poll = jiffies;
|
|
state(hdlc)->request = 1;
|
|
state(hdlc)->timer.expires = jiffies +
|
|
state(hdlc)->settings.t391 * HZ;
|
|
}
|
|
|
|
state(hdlc)->timer.function = fr_timer;
|
|
state(hdlc)->timer.data = arg;
|
|
add_timer(&state(hdlc)->timer);
|
|
}
|
|
|
|
|
|
static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
|
|
{
|
|
hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
pvc_device *pvc;
|
|
u8 rxseq, txseq;
|
|
int lmi = state(hdlc)->settings.lmi;
|
|
int dce = state(hdlc)->settings.dce;
|
|
int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
|
|
|
|
if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
|
|
LMI_CCITT_CISCO_LENGTH)) {
|
|
printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
|
|
return 1;
|
|
}
|
|
|
|
if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
|
|
NLPID_CCITT_ANSI_LMI)) {
|
|
printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
|
|
dev->name);
|
|
return 1;
|
|
}
|
|
|
|
if (skb->data[4] != LMI_CALLREF) {
|
|
printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
|
|
dev->name, skb->data[4]);
|
|
return 1;
|
|
}
|
|
|
|
if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
|
|
printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
|
|
dev->name, skb->data[5]);
|
|
return 1;
|
|
}
|
|
|
|
if (lmi == LMI_ANSI) {
|
|
if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
|
|
printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
|
|
" message (0x%02X)\n", dev->name, skb->data[6]);
|
|
return 1;
|
|
}
|
|
i = 7;
|
|
} else
|
|
i = 6;
|
|
|
|
if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
|
|
LMI_ANSI_CISCO_REPTYPE)) {
|
|
printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
|
|
dev->name, skb->data[i]);
|
|
return 1;
|
|
}
|
|
|
|
if (skb->data[++i] != LMI_REPT_LEN) {
|
|
printk(KERN_INFO "%s: Invalid LMI Report type IE length"
|
|
" (%u)\n", dev->name, skb->data[i]);
|
|
return 1;
|
|
}
|
|
|
|
reptype = skb->data[++i];
|
|
if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
|
|
printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
|
|
dev->name, reptype);
|
|
return 1;
|
|
}
|
|
|
|
if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
|
|
LMI_ANSI_CISCO_ALIVE)) {
|
|
printk(KERN_INFO "%s: Not an LMI Link integrity verification"
|
|
" IE (0x%02X)\n", dev->name, skb->data[i]);
|
|
return 1;
|
|
}
|
|
|
|
if (skb->data[++i] != LMI_INTEG_LEN) {
|
|
printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
|
|
" IE length (%u)\n", dev->name, skb->data[i]);
|
|
return 1;
|
|
}
|
|
i++;
|
|
|
|
state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
|
|
rxseq = skb->data[i++]; /* Should confirm our sequence */
|
|
|
|
txseq = state(hdlc)->txseq;
|
|
|
|
if (dce)
|
|
state(hdlc)->last_poll = jiffies;
|
|
|
|
error = 0;
|
|
if (!state(hdlc)->reliable)
|
|
error = 1;
|
|
|
|
if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
|
|
state(hdlc)->n391cnt = 0;
|
|
error = 1;
|
|
}
|
|
|
|
if (dce) {
|
|
if (state(hdlc)->fullrep_sent && !error) {
|
|
/* Stop sending full report - the last one has been confirmed by DTE */
|
|
state(hdlc)->fullrep_sent = 0;
|
|
pvc = state(hdlc)->first_pvc;
|
|
while (pvc) {
|
|
if (pvc->state.new) {
|
|
pvc->state.new = 0;
|
|
|
|
/* Tell DTE that new PVC is now active */
|
|
state(hdlc)->dce_changed = 1;
|
|
}
|
|
pvc = pvc->next;
|
|
}
|
|
}
|
|
|
|
if (state(hdlc)->dce_changed) {
|
|
reptype = LMI_FULLREP;
|
|
state(hdlc)->fullrep_sent = 1;
|
|
state(hdlc)->dce_changed = 0;
|
|
}
|
|
|
|
state(hdlc)->request = 1; /* got request */
|
|
fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
|
|
return 0;
|
|
}
|
|
|
|
/* DTE */
|
|
|
|
state(hdlc)->request = 0; /* got response, no request pending */
|
|
|
|
if (error)
|
|
return 0;
|
|
|
|
if (reptype != LMI_FULLREP)
|
|
return 0;
|
|
|
|
pvc = state(hdlc)->first_pvc;
|
|
|
|
while (pvc) {
|
|
pvc->state.deleted = 1;
|
|
pvc = pvc->next;
|
|
}
|
|
|
|
no_ram = 0;
|
|
while (skb->len >= i + 2 + stat_len) {
|
|
u16 dlci;
|
|
u32 bw;
|
|
unsigned int active, new;
|
|
|
|
if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
|
|
LMI_ANSI_CISCO_PVCSTAT)) {
|
|
printk(KERN_INFO "%s: Not an LMI PVC status IE"
|
|
" (0x%02X)\n", dev->name, skb->data[i]);
|
|
return 1;
|
|
}
|
|
|
|
if (skb->data[++i] != stat_len) {
|
|
printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
|
|
" (%u)\n", dev->name, skb->data[i]);
|
|
return 1;
|
|
}
|
|
i++;
|
|
|
|
new = !! (skb->data[i + 2] & 0x08);
|
|
active = !! (skb->data[i + 2] & 0x02);
|
|
if (lmi == LMI_CISCO) {
|
|
dlci = (skb->data[i] << 8) | skb->data[i + 1];
|
|
bw = (skb->data[i + 3] << 16) |
|
|
(skb->data[i + 4] << 8) |
|
|
(skb->data[i + 5]);
|
|
} else {
|
|
dlci = ((skb->data[i] & 0x3F) << 4) |
|
|
((skb->data[i + 1] & 0x78) >> 3);
|
|
bw = 0;
|
|
}
|
|
|
|
pvc = add_pvc(dev, dlci);
|
|
|
|
if (!pvc && !no_ram) {
|
|
printk(KERN_WARNING
|
|
"%s: Memory squeeze on fr_lmi_recv()\n",
|
|
dev->name);
|
|
no_ram = 1;
|
|
}
|
|
|
|
if (pvc) {
|
|
pvc->state.exist = 1;
|
|
pvc->state.deleted = 0;
|
|
if (active != pvc->state.active ||
|
|
new != pvc->state.new ||
|
|
bw != pvc->state.bandwidth ||
|
|
!pvc->state.exist) {
|
|
pvc->state.new = new;
|
|
pvc->state.active = active;
|
|
pvc->state.bandwidth = bw;
|
|
pvc_carrier(active, pvc);
|
|
fr_log_dlci_active(pvc);
|
|
}
|
|
}
|
|
|
|
i += stat_len;
|
|
}
|
|
|
|
pvc = state(hdlc)->first_pvc;
|
|
|
|
while (pvc) {
|
|
if (pvc->state.deleted && pvc->state.exist) {
|
|
pvc_carrier(0, pvc);
|
|
pvc->state.active = pvc->state.new = 0;
|
|
pvc->state.exist = 0;
|
|
pvc->state.bandwidth = 0;
|
|
fr_log_dlci_active(pvc);
|
|
}
|
|
pvc = pvc->next;
|
|
}
|
|
|
|
/* Next full report after N391 polls */
|
|
state(hdlc)->n391cnt = state(hdlc)->settings.n391;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int fr_rx(struct sk_buff *skb)
|
|
{
|
|
struct net_device *frad = skb->dev;
|
|
hdlc_device *hdlc = dev_to_hdlc(frad);
|
|
fr_hdr *fh = (fr_hdr*)skb->data;
|
|
u8 *data = skb->data;
|
|
u16 dlci;
|
|
pvc_device *pvc;
|
|
struct net_device *dev = NULL;
|
|
|
|
if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
|
|
goto rx_error;
|
|
|
|
dlci = q922_to_dlci(skb->data);
|
|
|
|
if ((dlci == LMI_CCITT_ANSI_DLCI &&
|
|
(state(hdlc)->settings.lmi == LMI_ANSI ||
|
|
state(hdlc)->settings.lmi == LMI_CCITT)) ||
|
|
(dlci == LMI_CISCO_DLCI &&
|
|
state(hdlc)->settings.lmi == LMI_CISCO)) {
|
|
if (fr_lmi_recv(frad, skb))
|
|
goto rx_error;
|
|
dev_kfree_skb_any(skb);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
pvc = find_pvc(hdlc, dlci);
|
|
if (!pvc) {
|
|
#ifdef DEBUG_PKT
|
|
printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
|
|
frad->name, dlci);
|
|
#endif
|
|
dev_kfree_skb_any(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
if (pvc->state.fecn != fh->fecn) {
|
|
#ifdef DEBUG_ECN
|
|
printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
|
|
dlci, fh->fecn ? "N" : "FF");
|
|
#endif
|
|
pvc->state.fecn ^= 1;
|
|
}
|
|
|
|
if (pvc->state.becn != fh->becn) {
|
|
#ifdef DEBUG_ECN
|
|
printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
|
|
dlci, fh->becn ? "N" : "FF");
|
|
#endif
|
|
pvc->state.becn ^= 1;
|
|
}
|
|
|
|
|
|
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
|
|
frad->stats.rx_dropped++;
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
if (data[3] == NLPID_IP) {
|
|
skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
|
|
dev = pvc->main;
|
|
skb->protocol = htons(ETH_P_IP);
|
|
|
|
} else if (data[3] == NLPID_IPV6) {
|
|
skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
|
|
dev = pvc->main;
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
|
|
} else if (skb->len > 10 && data[3] == FR_PAD &&
|
|
data[4] == NLPID_SNAP && data[5] == FR_PAD) {
|
|
u16 oui = ntohs(*(__be16*)(data + 6));
|
|
u16 pid = ntohs(*(__be16*)(data + 8));
|
|
skb_pull(skb, 10);
|
|
|
|
switch ((((u32)oui) << 16) | pid) {
|
|
case ETH_P_ARP: /* routed frame with SNAP */
|
|
case ETH_P_IPX:
|
|
case ETH_P_IP: /* a long variant */
|
|
case ETH_P_IPV6:
|
|
dev = pvc->main;
|
|
skb->protocol = htons(pid);
|
|
break;
|
|
|
|
case 0x80C20007: /* bridged Ethernet frame */
|
|
if ((dev = pvc->ether) != NULL)
|
|
skb->protocol = eth_type_trans(skb, dev);
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
|
|
"PID=%x\n", frad->name, oui, pid);
|
|
dev_kfree_skb_any(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
} else {
|
|
printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
|
|
"length = %i\n", frad->name, data[3], skb->len);
|
|
dev_kfree_skb_any(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
if (dev) {
|
|
dev->stats.rx_packets++; /* PVC traffic */
|
|
dev->stats.rx_bytes += skb->len;
|
|
if (pvc->state.becn)
|
|
dev->stats.rx_compressed++;
|
|
skb->dev = dev;
|
|
netif_rx(skb);
|
|
return NET_RX_SUCCESS;
|
|
} else {
|
|
dev_kfree_skb_any(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
rx_error:
|
|
frad->stats.rx_errors++; /* Mark error */
|
|
dev_kfree_skb_any(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
|
|
|
|
static void fr_start(struct net_device *dev)
|
|
{
|
|
hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
#ifdef DEBUG_LINK
|
|
printk(KERN_DEBUG "fr_start\n");
|
|
#endif
|
|
if (state(hdlc)->settings.lmi != LMI_NONE) {
|
|
state(hdlc)->reliable = 0;
|
|
state(hdlc)->dce_changed = 1;
|
|
state(hdlc)->request = 0;
|
|
state(hdlc)->fullrep_sent = 0;
|
|
state(hdlc)->last_errors = 0xFFFFFFFF;
|
|
state(hdlc)->n391cnt = 0;
|
|
state(hdlc)->txseq = state(hdlc)->rxseq = 0;
|
|
|
|
init_timer(&state(hdlc)->timer);
|
|
/* First poll after 1 s */
|
|
state(hdlc)->timer.expires = jiffies + HZ;
|
|
state(hdlc)->timer.function = fr_timer;
|
|
state(hdlc)->timer.data = (unsigned long)dev;
|
|
add_timer(&state(hdlc)->timer);
|
|
} else
|
|
fr_set_link_state(1, dev);
|
|
}
|
|
|
|
|
|
static void fr_stop(struct net_device *dev)
|
|
{
|
|
hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
#ifdef DEBUG_LINK
|
|
printk(KERN_DEBUG "fr_stop\n");
|
|
#endif
|
|
if (state(hdlc)->settings.lmi != LMI_NONE)
|
|
del_timer_sync(&state(hdlc)->timer);
|
|
fr_set_link_state(0, dev);
|
|
}
|
|
|
|
|
|
static void fr_close(struct net_device *dev)
|
|
{
|
|
hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
pvc_device *pvc = state(hdlc)->first_pvc;
|
|
|
|
while (pvc) { /* Shutdown all PVCs for this FRAD */
|
|
if (pvc->main)
|
|
dev_close(pvc->main);
|
|
if (pvc->ether)
|
|
dev_close(pvc->ether);
|
|
pvc = pvc->next;
|
|
}
|
|
}
|
|
|
|
|
|
static void pvc_setup(struct net_device *dev)
|
|
{
|
|
dev->type = ARPHRD_DLCI;
|
|
dev->flags = IFF_POINTOPOINT;
|
|
dev->hard_header_len = 10;
|
|
dev->addr_len = 2;
|
|
dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
|
|
}
|
|
|
|
static const struct net_device_ops pvc_ops = {
|
|
.ndo_open = pvc_open,
|
|
.ndo_stop = pvc_close,
|
|
.ndo_change_mtu = hdlc_change_mtu,
|
|
.ndo_start_xmit = pvc_xmit,
|
|
.ndo_do_ioctl = pvc_ioctl,
|
|
};
|
|
|
|
static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
|
|
{
|
|
hdlc_device *hdlc = dev_to_hdlc(frad);
|
|
pvc_device *pvc;
|
|
struct net_device *dev;
|
|
int result, used;
|
|
|
|
if ((pvc = add_pvc(frad, dlci)) == NULL) {
|
|
printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
|
|
frad->name);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
if (*get_dev_p(pvc, type))
|
|
return -EEXIST;
|
|
|
|
used = pvc_is_used(pvc);
|
|
|
|
if (type == ARPHRD_ETHER)
|
|
dev = alloc_netdev(0, "pvceth%d", ether_setup);
|
|
else
|
|
dev = alloc_netdev(0, "pvc%d", pvc_setup);
|
|
|
|
if (!dev) {
|
|
printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
|
|
frad->name);
|
|
delete_unused_pvcs(hdlc);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
if (type == ARPHRD_ETHER)
|
|
random_ether_addr(dev->dev_addr);
|
|
else {
|
|
*(__be16*)dev->dev_addr = htons(dlci);
|
|
dlci_to_q922(dev->broadcast, dlci);
|
|
}
|
|
dev->netdev_ops = &pvc_ops;
|
|
dev->mtu = HDLC_MAX_MTU;
|
|
dev->tx_queue_len = 0;
|
|
dev->ml_priv = pvc;
|
|
|
|
result = dev_alloc_name(dev, dev->name);
|
|
if (result < 0) {
|
|
free_netdev(dev);
|
|
delete_unused_pvcs(hdlc);
|
|
return result;
|
|
}
|
|
|
|
if (register_netdevice(dev) != 0) {
|
|
free_netdev(dev);
|
|
delete_unused_pvcs(hdlc);
|
|
return -EIO;
|
|
}
|
|
|
|
dev->destructor = free_netdev;
|
|
*get_dev_p(pvc, type) = dev;
|
|
if (!used) {
|
|
state(hdlc)->dce_changed = 1;
|
|
state(hdlc)->dce_pvc_count++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
|
|
{
|
|
pvc_device *pvc;
|
|
struct net_device *dev;
|
|
|
|
if ((pvc = find_pvc(hdlc, dlci)) == NULL)
|
|
return -ENOENT;
|
|
|
|
if ((dev = *get_dev_p(pvc, type)) == NULL)
|
|
return -ENOENT;
|
|
|
|
if (dev->flags & IFF_UP)
|
|
return -EBUSY; /* PVC in use */
|
|
|
|
unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
|
|
*get_dev_p(pvc, type) = NULL;
|
|
|
|
if (!pvc_is_used(pvc)) {
|
|
state(hdlc)->dce_pvc_count--;
|
|
state(hdlc)->dce_changed = 1;
|
|
}
|
|
delete_unused_pvcs(hdlc);
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
static void fr_destroy(struct net_device *frad)
|
|
{
|
|
hdlc_device *hdlc = dev_to_hdlc(frad);
|
|
pvc_device *pvc = state(hdlc)->first_pvc;
|
|
state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
|
|
state(hdlc)->dce_pvc_count = 0;
|
|
state(hdlc)->dce_changed = 1;
|
|
|
|
while (pvc) {
|
|
pvc_device *next = pvc->next;
|
|
/* destructors will free_netdev() main and ether */
|
|
if (pvc->main)
|
|
unregister_netdevice(pvc->main);
|
|
|
|
if (pvc->ether)
|
|
unregister_netdevice(pvc->ether);
|
|
|
|
kfree(pvc);
|
|
pvc = next;
|
|
}
|
|
}
|
|
|
|
|
|
static struct hdlc_proto proto = {
|
|
.close = fr_close,
|
|
.start = fr_start,
|
|
.stop = fr_stop,
|
|
.detach = fr_destroy,
|
|
.ioctl = fr_ioctl,
|
|
.netif_rx = fr_rx,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
|
|
static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
|
|
{
|
|
fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
|
|
const size_t size = sizeof(fr_proto);
|
|
fr_proto new_settings;
|
|
hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
fr_proto_pvc pvc;
|
|
int result;
|
|
|
|
switch (ifr->ifr_settings.type) {
|
|
case IF_GET_PROTO:
|
|
if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
|
|
return -EINVAL;
|
|
ifr->ifr_settings.type = IF_PROTO_FR;
|
|
if (ifr->ifr_settings.size < size) {
|
|
ifr->ifr_settings.size = size; /* data size wanted */
|
|
return -ENOBUFS;
|
|
}
|
|
if (copy_to_user(fr_s, &state(hdlc)->settings, size))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case IF_PROTO_FR:
|
|
if(!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if(dev->flags & IFF_UP)
|
|
return -EBUSY;
|
|
|
|
if (copy_from_user(&new_settings, fr_s, size))
|
|
return -EFAULT;
|
|
|
|
if (new_settings.lmi == LMI_DEFAULT)
|
|
new_settings.lmi = LMI_ANSI;
|
|
|
|
if ((new_settings.lmi != LMI_NONE &&
|
|
new_settings.lmi != LMI_ANSI &&
|
|
new_settings.lmi != LMI_CCITT &&
|
|
new_settings.lmi != LMI_CISCO) ||
|
|
new_settings.t391 < 1 ||
|
|
new_settings.t392 < 2 ||
|
|
new_settings.n391 < 1 ||
|
|
new_settings.n392 < 1 ||
|
|
new_settings.n393 < new_settings.n392 ||
|
|
new_settings.n393 > 32 ||
|
|
(new_settings.dce != 0 &&
|
|
new_settings.dce != 1))
|
|
return -EINVAL;
|
|
|
|
result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
|
|
if (result)
|
|
return result;
|
|
|
|
if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
|
|
result = attach_hdlc_protocol(dev, &proto,
|
|
sizeof(struct frad_state));
|
|
if (result)
|
|
return result;
|
|
state(hdlc)->first_pvc = NULL;
|
|
state(hdlc)->dce_pvc_count = 0;
|
|
}
|
|
memcpy(&state(hdlc)->settings, &new_settings, size);
|
|
dev->type = ARPHRD_FRAD;
|
|
return 0;
|
|
|
|
case IF_PROTO_FR_ADD_PVC:
|
|
case IF_PROTO_FR_DEL_PVC:
|
|
case IF_PROTO_FR_ADD_ETH_PVC:
|
|
case IF_PROTO_FR_DEL_ETH_PVC:
|
|
if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
|
|
return -EINVAL;
|
|
|
|
if(!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
|
|
sizeof(fr_proto_pvc)))
|
|
return -EFAULT;
|
|
|
|
if (pvc.dlci <= 0 || pvc.dlci >= 1024)
|
|
return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
|
|
|
|
if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
|
|
ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
|
|
result = ARPHRD_ETHER; /* bridged Ethernet device */
|
|
else
|
|
result = ARPHRD_DLCI;
|
|
|
|
if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
|
|
ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
|
|
return fr_add_pvc(dev, pvc.dlci, result);
|
|
else
|
|
return fr_del_pvc(hdlc, pvc.dlci, result);
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
static int __init mod_init(void)
|
|
{
|
|
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("Frame-Relay protocol support for generic HDLC");
|
|
MODULE_LICENSE("GPL v2");
|