diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/net/wan/hdlc_fr.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/net/wan/hdlc_fr.c | 1295 |
1 files changed, 0 insertions, 1295 deletions
diff --git a/ANDROID_3.4.5/drivers/net/wan/hdlc_fr.c b/ANDROID_3.4.5/drivers/net/wan/hdlc_fr.c deleted file mode 100644 index 7c6cb4f3..00000000 --- a/ANDROID_3.4.5/drivers/net/wan/hdlc_fr.c +++ /dev/null @@ -1,1295 +0,0 @@ -/* - * Generic HDLC support routines for Linux - * Frame Relay support - * - * Copyright (C) 1999 - 2006 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 - - CCITT LMI: ITU-T Q.933 Annex A - ANSI LMI: ANSI T1.617 Annex D - CISCO LMI: the original, aka "Gang of Four" LMI - -*/ - -#include <linux/errno.h> -#include <linux/etherdevice.h> -#include <linux/hdlc.h> -#include <linux/if_arp.h> -#include <linux/inetdevice.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/pkt_sched.h> -#include <linux/poll.h> -#include <linux/rtnetlink.h> -#include <linux/skbuff.h> -#include <linux/slab.h> - -#undef DEBUG_PKT -#undef DEBUG_ECN -#undef DEBUG_LINK -#undef DEBUG_PROTO -#undef DEBUG_PVC - -#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_CCITT_ANSI_LMI 0x08 -#define NLPID_CISCO_LMI 0x09 - - -#define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */ -#define LMI_CISCO_DLCI 1023 - -#define LMI_CALLREF 0x00 /* Call Reference */ -#define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */ -#define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */ -#define LMI_CCITT_REPTYPE 0x51 -#define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */ -#define LMI_CCITT_ALIVE 0x53 -#define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */ -#define LMI_CCITT_PVCSTAT 0x57 - -#define LMI_FULLREP 0x00 /* full report */ -#define LMI_INTEGRITY 0x01 /* link integrity report */ -#define LMI_SINGLE 0x02 /* 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_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */ -#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 -}__packed fr_hdr; - - -typedef struct pvc_device_struct { - struct net_device *frad; - struct net_device *main; - struct net_device *ether; /* bridged Ethernet interface */ - struct pvc_device_struct *next; /* Sorted in ascending DLCI order */ - int dlci; - int open_count; - - struct { - unsigned int new: 1; - unsigned int active: 1; - unsigned int exist: 1; - unsigned int deleted: 1; - unsigned int fecn: 1; - unsigned int becn: 1; - unsigned int bandwidth; /* Cisco LMI reporting only */ - }state; -}pvc_device; - -struct frad_state { - fr_proto settings; - pvc_device *first_pvc; - int dce_pvc_count; - - struct timer_list timer; - unsigned long last_poll; - int reliable; - int dce_changed; - int request; - int fullrep_sent; - u32 last_errors; /* last errors bit list */ - u8 n391cnt; - u8 txseq; /* TX sequence number */ - u8 rxseq; /* RX sequence number */ -}; - - -static int fr_ioctl(struct net_device *dev, struct ifreq *ifr); - - -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 struct frad_state* state(hdlc_device *hdlc) -{ - return(struct frad_state *)(hdlc->state); -} - - -static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci) -{ - pvc_device *pvc = state(hdlc)->first_pvc; - - while (pvc) { - if (pvc->dlci == dlci) - return pvc; - if (pvc->dlci > dlci) - return NULL; /* the list is sorted */ - pvc = pvc->next; - } - - return NULL; -} - - -static pvc_device* add_pvc(struct net_device *dev, u16 dlci) -{ - hdlc_device *hdlc = dev_to_hdlc(dev); - pvc_device *pvc, **pvc_p = &state(hdlc)->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 = kzalloc(sizeof(pvc_device), GFP_ATOMIC); -#ifdef DEBUG_PVC - printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev); -#endif - if (!pvc) - return NULL; - - pvc->dlci = dlci; - pvc->frad = 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 || pvc->ether; -} - - -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 = &state(hdlc)->first_pvc; - - while (*pvc_p) { - if (!pvc_is_used(*pvc_p)) { - pvc_device *pvc = *pvc_p; -#ifdef DEBUG_PVC - printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc); -#endif - *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 int fr_hard_header(struct sk_buff **skb_p, u16 dlci) -{ - u16 head_len; - struct sk_buff *skb = *skb_p; - - switch (skb->protocol) { - case cpu_to_be16(NLPID_CCITT_ANSI_LMI): - head_len = 4; - skb_push(skb, head_len); - skb->data[3] = NLPID_CCITT_ANSI_LMI; - break; - - case cpu_to_be16(NLPID_CISCO_LMI): - head_len = 4; - skb_push(skb, head_len); - skb->data[3] = NLPID_CISCO_LMI; - break; - - case cpu_to_be16(ETH_P_IP): - head_len = 4; - skb_push(skb, head_len); - skb->data[3] = NLPID_IP; - break; - - case cpu_to_be16(ETH_P_IPV6): - head_len = 4; - skb_push(skb, head_len); - skb->data[3] = NLPID_IPV6; - break; - - case cpu_to_be16(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; - *(__be16*)(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->ml_priv; - - if ((pvc->frad->flags & IFF_UP) == 0) - return -EIO; /* Frad must be UP in order to activate PVC */ - - if (pvc->open_count++ == 0) { - hdlc_device *hdlc = dev_to_hdlc(pvc->frad); - if (state(hdlc)->settings.lmi == LMI_NONE) - pvc->state.active = netif_carrier_ok(pvc->frad); - - pvc_carrier(pvc->state.active, pvc); - state(hdlc)->dce_changed = 1; - } - return 0; -} - - - -static int pvc_close(struct net_device *dev) -{ - pvc_device *pvc = dev->ml_priv; - - if (--pvc->open_count == 0) { - hdlc_device *hdlc = dev_to_hdlc(pvc->frad); - if (state(hdlc)->settings.lmi == LMI_NONE) - pvc->state.active = 0; - - if (state(hdlc)->settings.dce) { - state(hdlc)->dce_changed = 1; - pvc->state.active = 0; - } - } - return 0; -} - - - -static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) -{ - pvc_device *pvc = dev->ml_priv; - 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->frad->name, IFNAMSIZ); - if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info, - &info, sizeof(info))) - return -EFAULT; - return 0; - } - - return -EINVAL; -} - -static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev) -{ - pvc_device *pvc = dev->ml_priv; - - 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)) { - dev->stats.tx_dropped++; - dev_kfree_skb(skb); - return NETDEV_TX_OK; - } - skb_put(skb, pad); - memset(skb->data + len, 0, pad); - } - skb->protocol = cpu_to_be16(ETH_P_802_3); - } - if (!fr_hard_header(&skb, pvc->dlci)) { - dev->stats.tx_bytes += skb->len; - dev->stats.tx_packets++; - if (pvc->state.fecn) /* TX Congestion counter */ - dev->stats.tx_compressed++; - skb->dev = pvc->frad; - dev_queue_xmit(skb); - return NETDEV_TX_OK; - } - } - - dev->stats.tx_dropped++; - dev_kfree_skb(skb); - return NETDEV_TX_OK; -} - -static inline void fr_log_dlci_active(pvc_device *pvc) -{ - netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n", - 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 = state(hdlc)->first_pvc; - int lmi = state(hdlc)->settings.lmi; - int dce = state(hdlc)->settings.dce; - int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH; - int stat_len = (lmi == LMI_CISCO) ? 6 : 3; - u8 *data; - int i = 0; - - if (dce && fullrep) { - len += state(hdlc)->dce_pvc_count * (2 + stat_len); - if (len > HDLC_MAX_MRU) { - netdev_warn(dev, "Too many PVCs while sending LMI full report\n"); - return; - } - } - - skb = dev_alloc_skb(len); - if (!skb) { - netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n"); - return; - } - memset(skb->data, 0, len); - skb_reserve(skb, 4); - if (lmi == LMI_CISCO) { - skb->protocol = cpu_to_be16(NLPID_CISCO_LMI); - fr_hard_header(&skb, LMI_CISCO_DLCI); - } else { - skb->protocol = cpu_to_be16(NLPID_CCITT_ANSI_LMI); - fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI); - } - data = skb_tail_pointer(skb); - data[i++] = LMI_CALLREF; - data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY; - if (lmi == LMI_ANSI) - data[i++] = LMI_ANSI_LOCKSHIFT; - data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE : - LMI_ANSI_CISCO_REPTYPE; - 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) - netdev_info(dev, "No LMI status reply received\n"); - 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) { - netdev_info(dev, "Link %sreliable\n", 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)) { - netdev_info(dev, "Short LMI frame\n"); - return 1; - } - - if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI : - NLPID_CCITT_ANSI_LMI)) { - netdev_info(dev, "Received non-LMI frame with LMI DLCI\n"); - return 1; - } - - if (skb->data[4] != LMI_CALLREF) { - netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n", - skb->data[4]); - return 1; - } - - if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) { - netdev_info(dev, "Invalid LMI Message type (0x%02X)\n", - skb->data[5]); - return 1; - } - - if (lmi == LMI_ANSI) { - if (skb->data[6] != LMI_ANSI_LOCKSHIFT) { - netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n", - skb->data[6]); - return 1; - } - i = 7; - } else - i = 6; - - if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE : - LMI_ANSI_CISCO_REPTYPE)) { - netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n", - skb->data[i]); - return 1; - } - - if (skb->data[++i] != LMI_REPT_LEN) { - netdev_info(dev, "Invalid LMI Report type IE length (%u)\n", - skb->data[i]); - return 1; - } - - reptype = skb->data[++i]; - if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) { - netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n", - reptype); - return 1; - } - - if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE : - LMI_ANSI_CISCO_ALIVE)) { - netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n", - skb->data[i]); - return 1; - } - - if (skb->data[++i] != LMI_INTEG_LEN) { - netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n", - 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)) { - netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n", - skb->data[i]); - return 1; - } - - if (skb->data[++i] != stat_len) { - netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n", - 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) { - netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n"); - 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 - netdev_info(frad, "No PVC for received frame's DLCI %d\n", - 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: - netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n", - oui, pid); - dev_kfree_skb_any(skb); - return NET_RX_DROP; - } - } else { - netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n", - 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 used; - - if ((pvc = add_pvc(frad, dlci)) == NULL) { - netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n"); - 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); - dev->priv_flags &= ~IFF_TX_SKB_SHARING; - } else - dev = alloc_netdev(0, "pvc%d", pvc_setup); - - if (!dev) { - netdev_warn(frad, "Memory squeeze on fr_pvc()\n"); - delete_unused_pvcs(hdlc); - return -ENOBUFS; - } - - if (type == ARPHRD_ETHER) - eth_hw_addr_random(dev); - 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; - - 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"); |