diff options
Diffstat (limited to 'drivers/net/wan/hdlc_fr.c')
| -rw-r--r-- | drivers/net/wan/hdlc_fr.c | 1237 |
1 files changed, 1237 insertions, 0 deletions
diff --git a/drivers/net/wan/hdlc_fr.c b/drivers/net/wan/hdlc_fr.c new file mode 100644 index 00000000000..7f450b51a6c --- /dev/null +++ b/drivers/net/wan/hdlc_fr.c @@ -0,0 +1,1237 @@ +/* + * Generic HDLC support routines for Linux + * Frame Relay support + * + * Copyright (C) 1999 - 2003 Krzysztof Halasa <khc@pm.waw.pl> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License + * as published by the Free Software Foundation. + * + + Theory of PVC state + + DCE mode: + + (exist,new) -> 0,0 when "PVC create" or if "link unreliable" + 0,x -> 1,1 if "link reliable" when sending FULL STATUS + 1,1 -> 1,0 if received FULL STATUS ACK + + (active) -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create" + -> 1 when "PVC up" and (exist,new) = 1,0 + + DTE mode: + (exist,new,active) = FULL STATUS if "link reliable" + = 0, 0, 0 if "link unreliable" + No LMI: + active = open and "link reliable" + exist = new = not used + +*/ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/poll.h> +#include <linux/errno.h> +#include <linux/if_arp.h> +#include <linux/init.h> +#include <linux/skbuff.h> +#include <linux/pkt_sched.h> +#include <linux/random.h> +#include <linux/inetdevice.h> +#include <linux/lapb.h> +#include <linux/rtnetlink.h> +#include <linux/etherdevice.h> +#include <linux/hdlc.h> + +#undef DEBUG_PKT +#undef DEBUG_ECN +#undef DEBUG_LINK + +#define MAXLEN_LMISTAT 20 /* max size of status enquiry frame */ + +#define PVC_STATE_NEW 0x01 +#define PVC_STATE_ACTIVE 0x02 +#define PVC_STATE_FECN 0x08 /* FECN condition */ +#define PVC_STATE_BECN 0x10 /* BECN condition */ + + +#define FR_UI 0x03 +#define FR_PAD 0x00 + +#define NLPID_IP 0xCC +#define NLPID_IPV6 0x8E +#define NLPID_SNAP 0x80 +#define NLPID_PAD 0x00 +#define NLPID_Q933 0x08 + + +#define LMI_DLCI 0 /* LMI DLCI */ +#define LMI_PROTO 0x08 +#define LMI_CALLREF 0x00 /* Call Reference */ +#define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI lockshift */ +#define LMI_REPTYPE 1 /* report type */ +#define LMI_CCITT_REPTYPE 0x51 +#define LMI_ALIVE 3 /* keep alive */ +#define LMI_CCITT_ALIVE 0x53 +#define LMI_PVCSTAT 7 /* pvc status */ +#define LMI_CCITT_PVCSTAT 0x57 +#define LMI_FULLREP 0 /* full report */ +#define LMI_INTEGRITY 1 /* link integrity report */ +#define LMI_SINGLE 2 /* single pvc report */ +#define LMI_STATUS_ENQUIRY 0x75 +#define LMI_STATUS 0x7D /* reply */ + +#define LMI_REPT_LEN 1 /* report type element length */ +#define LMI_INTEG_LEN 2 /* link integrity element length */ + +#define LMI_LENGTH 13 /* standard LMI frame length */ +#define LMI_ANSI_LENGTH 14 + + +typedef struct { +#if defined(__LITTLE_ENDIAN_BITFIELD) + unsigned ea1: 1; + unsigned cr: 1; + unsigned dlcih: 6; + + unsigned ea2: 1; + unsigned de: 1; + unsigned becn: 1; + unsigned fecn: 1; + unsigned dlcil: 4; +#else + unsigned dlcih: 6; + unsigned cr: 1; + unsigned ea1: 1; + + unsigned dlcil: 4; + unsigned fecn: 1; + unsigned becn: 1; + unsigned de: 1; + unsigned ea2: 1; +#endif +}__attribute__ ((packed)) fr_hdr; + + +static inline u16 q922_to_dlci(u8 *hdr) +{ + return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4); +} + + + +static inline void dlci_to_q922(u8 *hdr, u16 dlci) +{ + hdr[0] = (dlci >> 2) & 0xFC; + hdr[1] = ((dlci << 4) & 0xF0) | 0x01; +} + + + +static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci) +{ + pvc_device *pvc = hdlc->state.fr.first_pvc; + + while (pvc) { + if (pvc->dlci == dlci) + return pvc; + if (pvc->dlci > dlci) + return NULL; /* the listed is sorted */ + pvc = pvc->next; + } + + return NULL; +} + + +static inline pvc_device* add_pvc(struct net_device *dev, u16 dlci) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); + pvc_device *pvc, **pvc_p = &hdlc->state.fr.first_pvc; + + while (*pvc_p) { + if ((*pvc_p)->dlci == dlci) + return *pvc_p; + if ((*pvc_p)->dlci > dlci) + break; /* the list is sorted */ + pvc_p = &(*pvc_p)->next; + } + + pvc = kmalloc(sizeof(pvc_device), GFP_ATOMIC); + if (!pvc) + return NULL; + + memset(pvc, 0, sizeof(pvc_device)); + pvc->dlci = dlci; + pvc->master = dev; + pvc->next = *pvc_p; /* Put it in the chain */ + *pvc_p = pvc; + return pvc; +} + + +static inline int pvc_is_used(pvc_device *pvc) +{ + return pvc->main != NULL || pvc->ether != NULL; +} + + +static inline void pvc_carrier(int on, pvc_device *pvc) +{ + if (on) { + if (pvc->main) + if (!netif_carrier_ok(pvc->main)) + netif_carrier_on(pvc->main); + if (pvc->ether) + if (!netif_carrier_ok(pvc->ether)) + netif_carrier_on(pvc->ether); + } else { + if (pvc->main) + if (netif_carrier_ok(pvc->main)) + netif_carrier_off(pvc->main); + if (pvc->ether) + if (netif_carrier_ok(pvc->ether)) + netif_carrier_off(pvc->ether); + } +} + + +static inline void delete_unused_pvcs(hdlc_device *hdlc) +{ + pvc_device **pvc_p = &hdlc->state.fr.first_pvc; + + while (*pvc_p) { + if (!pvc_is_used(*pvc_p)) { + pvc_device *pvc = *pvc_p; + *pvc_p = pvc->next; + kfree(pvc); + continue; + } + pvc_p = &(*pvc_p)->next; + } +} + + +static inline struct net_device** get_dev_p(pvc_device *pvc, int type) +{ + if (type == ARPHRD_ETHER) + return &pvc->ether; + else + return &pvc->main; +} + + +static inline u16 status_to_dlci(u8 *status, int *active, int *new) +{ + *new = (status[2] & 0x08) ? 1 : 0; + *active = (status[2] & 0x02) ? 1 : 0; + + return ((status[0] & 0x3F) << 4) | ((status[1] & 0x78) >> 3); +} + + +static inline void dlci_to_status(u16 dlci, u8 *status, int active, int new) +{ + status[0] = (dlci >> 4) & 0x3F; + status[1] = ((dlci << 3) & 0x78) | 0x80; + status[2] = 0x80; + + if (new) + status[2] |= 0x08; + else if (active) + status[2] |= 0x02; +} + + + +static int fr_hard_header(struct sk_buff **skb_p, u16 dlci) +{ + u16 head_len; + struct sk_buff *skb = *skb_p; + + switch (skb->protocol) { + case __constant_ntohs(ETH_P_IP): + head_len = 4; + skb_push(skb, head_len); + skb->data[3] = NLPID_IP; + break; + + case __constant_ntohs(ETH_P_IPV6): + head_len = 4; + skb_push(skb, head_len); + skb->data[3] = NLPID_IPV6; + break; + + case __constant_ntohs(LMI_PROTO): + head_len = 4; + skb_push(skb, head_len); + skb->data[3] = LMI_PROTO; + break; + + case __constant_ntohs(ETH_P_802_3): + head_len = 10; + if (skb_headroom(skb) < head_len) { + struct sk_buff *skb2 = skb_realloc_headroom(skb, + head_len); + if (!skb2) + return -ENOBUFS; + dev_kfree_skb(skb); + skb = *skb_p = skb2; + } + skb_push(skb, head_len); + skb->data[3] = FR_PAD; + skb->data[4] = NLPID_SNAP; + skb->data[5] = FR_PAD; + skb->data[6] = 0x80; + skb->data[7] = 0xC2; + skb->data[8] = 0x00; + skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */ + break; + + default: + head_len = 10; + skb_push(skb, head_len); + skb->data[3] = FR_PAD; + skb->data[4] = NLPID_SNAP; + skb->data[5] = FR_PAD; + skb->data[6] = FR_PAD; + skb->data[7] = FR_PAD; + *(u16*)(skb->data + 8) = skb->protocol; + } + + dlci_to_q922(skb->data, dlci); + skb->data[2] = FR_UI; + return 0; +} + + + +static int pvc_open(struct net_device *dev) +{ + pvc_device *pvc = dev_to_pvc(dev); + + if ((pvc->master->flags & IFF_UP) == 0) + return -EIO; /* Master must be UP in order to activate PVC */ + + if (pvc->open_count++ == 0) { + hdlc_device *hdlc = dev_to_hdlc(pvc->master); + if (hdlc->state.fr.settings.lmi == LMI_NONE) + pvc->state.active = hdlc->carrier; + + pvc_carrier(pvc->state.active, pvc); + hdlc->state.fr.dce_changed = 1; + } + return 0; +} + + + +static int pvc_close(struct net_device *dev) +{ + pvc_device *pvc = dev_to_pvc(dev); + + if (--pvc->open_count == 0) { + hdlc_device *hdlc = dev_to_hdlc(pvc->master); + if (hdlc->state.fr.settings.lmi == LMI_NONE) + pvc->state.active = 0; + + if (hdlc->state.fr.settings.dce) { + hdlc->state.fr.dce_changed = 1; + pvc->state.active = 0; + } + } + return 0; +} + + + +int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) +{ + pvc_device *pvc = dev_to_pvc(dev); + fr_proto_pvc_info info; + + if (ifr->ifr_settings.type == IF_GET_PROTO) { + if (dev->type == ARPHRD_ETHER) + ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC; + else + ifr->ifr_settings.type = IF_PROTO_FR_PVC; + + if (ifr->ifr_settings.size < sizeof(info)) { + /* data size wanted */ + ifr->ifr_settings.size = sizeof(info); + return -ENOBUFS; + } + + info.dlci = pvc->dlci; + memcpy(info.master, pvc->master->name, IFNAMSIZ); + if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info, + &info, sizeof(info))) + return -EFAULT; + return 0; + } + + return -EINVAL; +} + + +static inline struct net_device_stats *pvc_get_stats(struct net_device *dev) +{ + return netdev_priv(dev); +} + + + +static int pvc_xmit(struct sk_buff *skb, struct net_device *dev) +{ + pvc_device *pvc = dev_to_pvc(dev); + struct net_device_stats *stats = pvc_get_stats(dev); + + if (pvc->state.active) { + if (dev->type == ARPHRD_ETHER) { + int pad = ETH_ZLEN - skb->len; + if (pad > 0) { /* Pad the frame with zeros */ + int len = skb->len; + if (skb_tailroom(skb) < pad) + if (pskb_expand_head(skb, 0, pad, + GFP_ATOMIC)) { + stats->tx_dropped++; + dev_kfree_skb(skb); + return 0; + } + skb_put(skb, pad); + memset(skb->data + len, 0, pad); + } + skb->protocol = __constant_htons(ETH_P_802_3); + } + if (!fr_hard_header(&skb, pvc->dlci)) { + stats->tx_bytes += skb->len; + stats->tx_packets++; + if (pvc->state.fecn) /* TX Congestion counter */ + stats->tx_compressed++; + skb->dev = pvc->master; + dev_queue_xmit(skb); + return 0; + } + } + + stats->tx_dropped++; + dev_kfree_skb(skb); + return 0; +} + + + +static int pvc_change_mtu(struct net_device *dev, int new_mtu) +{ + if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU)) + return -EINVAL; + dev->mtu = new_mtu; + return 0; +} + + + +static inline void fr_log_dlci_active(pvc_device *pvc) +{ + printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n", + pvc->master->name, + pvc->dlci, + pvc->main ? pvc->main->name : "", + pvc->main && pvc->ether ? " " : "", + pvc->ether ? pvc->ether->name : "", + pvc->state.new ? " new" : "", + !pvc->state.exist ? "deleted" : + pvc->state.active ? "active" : "inactive"); +} + + + +static inline u8 fr_lmi_nextseq(u8 x) +{ + x++; + return x ? x : 1; +} + + + +static void fr_lmi_send(struct net_device *dev, int fullrep) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); + struct sk_buff *skb; + pvc_device *pvc = hdlc->state.fr.first_pvc; + int len = (hdlc->state.fr.settings.lmi == LMI_ANSI) ? LMI_ANSI_LENGTH + : LMI_LENGTH; + int stat_len = 3; + u8 *data; + int i = 0; + + if (hdlc->state.fr.settings.dce && fullrep) { + len += hdlc->state.fr.dce_pvc_count * (2 + stat_len); + if (len > HDLC_MAX_MRU) { + printk(KERN_WARNING "%s: Too many PVCs while sending " + "LMI full report\n", dev->name); + return; + } + } + + skb = dev_alloc_skb(len); + if (!skb) { + printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n", + dev->name); + return; + } + memset(skb->data, 0, len); + skb_reserve(skb, 4); + skb->protocol = __constant_htons(LMI_PROTO); + fr_hard_header(&skb, LMI_DLCI); + data = skb->tail; + data[i++] = LMI_CALLREF; + data[i++] = hdlc->state.fr.settings.dce + ? LMI_STATUS : LMI_STATUS_ENQUIRY; + if (hdlc->state.fr.settings.lmi == LMI_ANSI) + data[i++] = LMI_ANSI_LOCKSHIFT; + data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT) + ? LMI_CCITT_REPTYPE : LMI_REPTYPE; + data[i++] = LMI_REPT_LEN; + data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY; + + data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT) + ? LMI_CCITT_ALIVE : LMI_ALIVE; + data[i++] = LMI_INTEG_LEN; + data[i++] = hdlc->state.fr.txseq =fr_lmi_nextseq(hdlc->state.fr.txseq); + data[i++] = hdlc->state.fr.rxseq; + + if (hdlc->state.fr.settings.dce && fullrep) { + while (pvc) { + data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT) + ? LMI_CCITT_PVCSTAT : LMI_PVCSTAT; + data[i++] = stat_len; + + /* LMI start/restart */ + if (hdlc->state.fr.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); + } + + dlci_to_status(pvc->dlci, data + i, + pvc->state.active, pvc->state.new); + i += stat_len; + pvc = pvc->next; + } + } + + skb_put(skb, i); + skb->priority = TC_PRIO_CONTROL; + skb->dev = dev; + skb->nh.raw = skb->data; + + 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 = hdlc->state.fr.first_pvc; + + hdlc->state.fr.reliable = reliable; + if (reliable) { + if (!netif_carrier_ok(dev)) + netif_carrier_on(dev); + + hdlc->state.fr.n391cnt = 0; /* Request full status */ + hdlc->state.fr.dce_changed = 1; + + if (hdlc->state.fr.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 { + if (netif_carrier_ok(dev)) + netif_carrier_off(dev); + + while (pvc) { /* Deactivate all PVCs */ + pvc_carrier(0, pvc); + pvc->state.exist = pvc->state.active = 0; + pvc->state.new = 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 (hdlc->state.fr.settings.dce) + reliable = hdlc->state.fr.request && + time_before(jiffies, hdlc->state.fr.last_poll + + hdlc->state.fr.settings.t392 * HZ); + else { + hdlc->state.fr.last_errors <<= 1; /* Shift the list */ + if (hdlc->state.fr.request) { + if (hdlc->state.fr.reliable) + printk(KERN_INFO "%s: No LMI status reply " + "received\n", dev->name); + hdlc->state.fr.last_errors |= 1; + } + + list = hdlc->state.fr.last_errors; + for (i = 0; i < hdlc->state.fr.settings.n393; i++, list >>= 1) + cnt += (list & 1); /* errors count */ + + reliable = (cnt < hdlc->state.fr.settings.n392); + } + + if (hdlc->state.fr.reliable != reliable) { + printk(KERN_INFO "%s: Link %sreliable\n", dev->name, + reliable ? "" : "un"); + fr_set_link_state(reliable, dev); + } + + if (hdlc->state.fr.settings.dce) + hdlc->state.fr.timer.expires = jiffies + + hdlc->state.fr.settings.t392 * HZ; + else { + if (hdlc->state.fr.n391cnt) + hdlc->state.fr.n391cnt--; + + fr_lmi_send(dev, hdlc->state.fr.n391cnt == 0); + + hdlc->state.fr.last_poll = jiffies; + hdlc->state.fr.request = 1; + hdlc->state.fr.timer.expires = jiffies + + hdlc->state.fr.settings.t391 * HZ; + } + + hdlc->state.fr.timer.function = fr_timer; + hdlc->state.fr.timer.data = arg; + add_timer(&hdlc->state.fr.timer); +} + + + +static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); + int stat_len; + pvc_device *pvc; + int reptype = -1, error, no_ram; + u8 rxseq, txseq; + int i; + + if (skb->len < ((hdlc->state.fr.settings.lmi == LMI_ANSI) + ? LMI_ANSI_LENGTH : LMI_LENGTH)) { + printk(KERN_INFO "%s: Short LMI frame\n", dev->name); + return 1; + } + + if (skb->data[5] != (!hdlc->state.fr.settings.dce ? + LMI_STATUS : LMI_STATUS_ENQUIRY)) { + printk(KERN_INFO "%s: LMI msgtype=%x, Not LMI status %s\n", + dev->name, skb->data[2], + hdlc->state.fr.settings.dce ? "enquiry" : "reply"); + return 1; + } + + i = (hdlc->state.fr.settings.lmi == LMI_ANSI) ? 7 : 6; + + if (skb->data[i] != + ((hdlc->state.fr.settings.lmi == LMI_CCITT) + ? LMI_CCITT_REPTYPE : LMI_REPTYPE)) { + printk(KERN_INFO "%s: Not a report type=%x\n", + dev->name, skb->data[i]); + return 1; + } + i++; + + i++; /* Skip length field */ + + reptype = skb->data[i++]; + + if (skb->data[i]!= + ((hdlc->state.fr.settings.lmi == LMI_CCITT) + ? LMI_CCITT_ALIVE : LMI_ALIVE)) { + printk(KERN_INFO "%s: Unsupported status element=%x\n", + dev->name, skb->data[i]); + return 1; + } + i++; + + i++; /* Skip length field */ + + hdlc->state.fr.rxseq = skb->data[i++]; /* TX sequence from peer */ + rxseq = skb->data[i++]; /* Should confirm our sequence */ + + txseq = hdlc->state.fr.txseq; + + if (hdlc->state.fr.settings.dce) { + if (reptype != LMI_FULLREP && reptype != LMI_INTEGRITY) { + printk(KERN_INFO "%s: Unsupported report type=%x\n", + dev->name, reptype); + return 1; + } + hdlc->state.fr.last_poll = jiffies; + } + + error = 0; + if (!hdlc->state.fr.reliable) + error = 1; + + if (rxseq == 0 || rxseq != txseq) { + hdlc->state.fr.n391cnt = 0; /* Ask for full report next time */ + error = 1; + } + + if (hdlc->state.fr.settings.dce) { + if (hdlc->state.fr.fullrep_sent && !error) { +/* Stop sending full report - the last one has been confirmed by DTE */ + hdlc->state.fr.fullrep_sent = 0; + pvc = hdlc->state.fr.first_pvc; + while (pvc) { + if (pvc->state.new) { + pvc->state.new = 0; + +/* Tell DTE that new PVC is now active */ + hdlc->state.fr.dce_changed = 1; + } + pvc = pvc->next; + } + } + + if (hdlc->state.fr.dce_changed) { + reptype = LMI_FULLREP; + hdlc->state.fr.fullrep_sent = 1; + hdlc->state.fr.dce_changed = 0; + } + + fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0); + return 0; + } + + /* DTE */ + + hdlc->state.fr.request = 0; /* got response, no request pending */ + + if (error) + return 0; + + if (reptype != LMI_FULLREP) + return 0; + + stat_len = 3; + pvc = hdlc->state.fr.first_pvc; + + while (pvc) { + pvc->state.deleted = 1; + pvc = pvc->next; + } + + no_ram = 0; + while (skb->len >= i + 2 + stat_len) { + u16 dlci; + unsigned int active, new; + + if (skb->data[i] != ((hdlc->state.fr.settings.lmi == LMI_CCITT) + ? LMI_CCITT_PVCSTAT : LMI_PVCSTAT)) { + printk(KERN_WARNING "%s: Invalid PVCSTAT ID: %x\n", + dev->name, skb->data[i]); + return 1; + } + i++; + + if (skb->data[i] != stat_len) { + printk(KERN_WARNING "%s: Invalid PVCSTAT length: %x\n", + dev->name, skb->data[i]); + return 1; + } + i++; + + dlci = status_to_dlci(skb->data + i, &active, &new); + + 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 || + !pvc->state.exist) { + pvc->state.new = new; + pvc->state.active = active; + pvc_carrier(active, pvc); + fr_log_dlci_active(pvc); + } + } + + i += stat_len; + } + + pvc = hdlc->state.fr.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; + fr_log_dlci_active(pvc); + } + pvc = pvc->next; + } + + /* Next full report after N391 polls */ + hdlc->state.fr.n391cnt = hdlc->state.fr.settings.n391; + + return 0; +} + + + +static int fr_rx(struct sk_buff *skb) +{ + struct net_device *ndev = skb->dev; + hdlc_device *hdlc = dev_to_hdlc(ndev); + 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_DLCI) { + if (hdlc->state.fr.settings.lmi == LMI_NONE) + goto rx_error; /* LMI packet with no LMI? */ + + if (data[3] == LMI_PROTO) { + if (fr_lmi_recv(ndev, skb)) + goto rx_error; + else { + dev_kfree_skb_any(skb); + return NET_RX_SUCCESS; + } + } + + printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n", + ndev->name); + goto rx_error; + } + + pvc = find_pvc(hdlc, dlci); + if (!pvc) { +#ifdef DEBUG_PKT + printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n", + ndev->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", ndev->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", ndev->name, + dlci, fh->becn ? "N" : "FF"); +#endif + pvc->state.becn ^= 1; + } + + + if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { + hdlc->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(*(u16*)(data + 6)); + u16 pid = ntohs(*(u16*)(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", ndev->name, oui, pid); + dev_kfree_skb_any(skb); + return NET_RX_DROP; + } + } else { + printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x " + "length = %i\n", ndev->name, data[3], skb->len); + dev_kfree_skb_any(skb); + return NET_RX_DROP; + } + + if (dev) { + struct net_device_stats *stats = pvc_get_stats(dev); + stats->rx_packets++; /* PVC traffic */ + stats->rx_bytes += skb->len; + if (pvc->state.becn) + 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: + hdlc->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 (hdlc->state.fr.settings.lmi != LMI_NONE) { + hdlc->state.fr.reliable = 0; + hdlc->state.fr.dce_changed = 1; + hdlc->state.fr.request = 0; + hdlc->state.fr.fullrep_sent = 0; + hdlc->state.fr.last_errors = 0xFFFFFFFF; + hdlc->state.fr.n391cnt = 0; + hdlc->state.fr.txseq = hdlc->state.fr.rxseq = 0; + + init_timer(&hdlc->state.fr.timer); + /* First poll after 1 s */ + hdlc->state.fr.timer.expires = jiffies + HZ; + hdlc->state.fr.timer.function = fr_timer; + hdlc->state.fr.timer.data = (unsigned long)dev; + add_timer(&hdlc->state.fr.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 (hdlc->state.fr.settings.lmi != LMI_NONE) + del_timer_sync(&hdlc->state.fr.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 = hdlc->state.fr.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 dlci_setup(struct net_device *dev) +{ + dev->type = ARPHRD_DLCI; + dev->flags = IFF_POINTOPOINT; + dev->hard_header_len = 10; + dev->addr_len = 2; +} + +static int fr_add_pvc(struct net_device *master, unsigned int dlci, int type) +{ + hdlc_device *hdlc = dev_to_hdlc(master); + pvc_device *pvc = NULL; + struct net_device *dev; + int result, used; + char * prefix = "pvc%d"; + + if (type == ARPHRD_ETHER) + prefix = "pvceth%d"; + + if ((pvc = add_pvc(master, dlci)) == NULL) { + printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n", + master->name); + return -ENOBUFS; + } + + if (*get_dev_p(pvc, type)) + return -EEXIST; + + used = pvc_is_used(pvc); + + if (type == ARPHRD_ETHER) + dev = alloc_netdev(sizeof(struct net_device_stats), + "pvceth%d", ether_setup); + else + dev = alloc_netdev(sizeof(struct net_device_stats), + "pvc%d", dlci_setup); + + if (!dev) { + printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n", + master->name); + delete_unused_pvcs(hdlc); + return -ENOBUFS; + } + + if (type == ARPHRD_ETHER) { + memcpy(dev->dev_addr, "\x00\x01", 2); + get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2); + } else { + *(u16*)dev->dev_addr = htons(dlci); + dlci_to_q922(dev->broadcast, dlci); + } + dev->hard_start_xmit = pvc_xmit; + dev->get_stats = pvc_get_stats; + dev->open = pvc_open; + dev->stop = pvc_close; + dev->do_ioctl = pvc_ioctl; + dev->change_mtu = pvc_change_mtu; + dev->mtu = HDLC_MAX_MTU; + dev->tx_queue_len = 0; + dev->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) { + hdlc->state.fr.dce_changed = 1; + hdlc->state.fr.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)) { + hdlc->state.fr.dce_pvc_count--; + hdlc->state.fr.dce_changed = 1; + } + delete_unused_pvcs(hdlc); + return 0; +} + + + +static void fr_destroy(hdlc_device *hdlc) +{ + pvc_device *pvc; + + pvc = hdlc->state.fr.first_pvc; + hdlc->state.fr.first_pvc = NULL; /* All PVCs destroyed */ + hdlc->state.fr.dce_pvc_count = 0; + hdlc->state.fr.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; + } +} + + + +int hdlc_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: + 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, &hdlc->state.fr.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.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 (hdlc->proto.id != IF_PROTO_FR) { + hdlc_proto_detach(hdlc); + hdlc->state.fr.first_pvc = NULL; + hdlc->state.fr.dce_pvc_count = 0; + } + memcpy(&hdlc->state.fr.settings, &new_settings, size); + memset(&hdlc->proto, 0, sizeof(hdlc->proto)); + + hdlc->proto.close = fr_close; + hdlc->proto.start = fr_start; + hdlc->proto.stop = fr_stop; + hdlc->proto.detach = fr_destroy; + hdlc->proto.netif_rx = fr_rx; + hdlc->proto.id = IF_PROTO_FR; + dev->hard_start_xmit = hdlc->xmit; + dev->hard_header = NULL; + dev->type = ARPHRD_FRAD; + dev->flags = IFF_POINTOPOINT | IFF_NOARP; + dev->addr_len = 0; + 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(!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; +} |