diff options
Diffstat (limited to 'drivers/net/wan/hdlc_fr.c')
| -rw-r--r-- | drivers/net/wan/hdlc_fr.c | 1300 |
1 files changed, 1300 insertions, 0 deletions
diff --git a/drivers/net/wan/hdlc_fr.c b/drivers/net/wan/hdlc_fr.c new file mode 100644 index 000000000..81e72bc18 --- /dev/null +++ b/drivers/net/wan/hdlc_fr.c @@ -0,0 +1,1300 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Generic HDLC support routines for Linux + * Frame Relay support + * + * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl> + * + + 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 + +struct fr_hdr { +#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; + +struct pvc_device { + struct net_device *frad; + struct net_device *main; + struct net_device *ether; /* bridged Ethernet interface */ + struct pvc_device *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; +}; + +struct frad_state { + fr_proto settings; + struct pvc_device *first_pvc; + int dce_pvc_count; + + struct timer_list timer; + struct net_device *dev; + 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 if_settings *ifs); + +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 struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci) +{ + struct 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 struct pvc_device *add_pvc(struct net_device *dev, u16 dlci) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); + struct 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), 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(struct pvc_device *pvc) +{ + return pvc->main || pvc->ether; +} + +static inline void pvc_carrier(int on, struct 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) +{ + struct pvc_device **pvc_p = &state(hdlc)->first_pvc; + + while (*pvc_p) { + if (!pvc_is_used(*pvc_p)) { + struct 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(struct 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, u16 dlci) +{ + if (!skb->dev) { /* Control packets */ + switch (dlci) { + case LMI_CCITT_ANSI_DLCI: + skb_push(skb, 4); + skb->data[3] = NLPID_CCITT_ANSI_LMI; + break; + + case LMI_CISCO_DLCI: + skb_push(skb, 4); + skb->data[3] = NLPID_CISCO_LMI; + break; + + default: + return -EINVAL; + } + + } else if (skb->dev->type == ARPHRD_DLCI) { + switch (skb->protocol) { + case htons(ETH_P_IP): + skb_push(skb, 4); + skb->data[3] = NLPID_IP; + break; + + case htons(ETH_P_IPV6): + skb_push(skb, 4); + skb->data[3] = NLPID_IPV6; + break; + + default: + skb_push(skb, 10); + skb->data[3] = FR_PAD; + skb->data[4] = NLPID_SNAP; + /* OUI 00-00-00 indicates an Ethertype follows */ + skb->data[5] = 0x00; + skb->data[6] = 0x00; + skb->data[7] = 0x00; + /* This should be an Ethertype: */ + *(__be16 *)(skb->data + 8) = skb->protocol; + } + + } else if (skb->dev->type == ARPHRD_ETHER) { + skb_push(skb, 10); + skb->data[3] = FR_PAD; + skb->data[4] = NLPID_SNAP; + /* OUI 00-80-C2 stands for the 802.1 organization */ + skb->data[5] = 0x00; + skb->data[6] = 0x80; + skb->data[7] = 0xC2; + /* PID 00-07 stands for Ethernet frames without FCS */ + skb->data[8] = 0x00; + skb->data[9] = 0x07; + + } else { + return -EINVAL; + } + + dlci_to_q922(skb->data, dlci); + skb->data[2] = FR_UI; + return 0; +} + +static int pvc_open(struct net_device *dev) +{ + struct 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) +{ + struct 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 if_settings *ifs) +{ + struct pvc_device *pvc = dev->ml_priv; + fr_proto_pvc_info info; + + if (ifs->type == IF_GET_PROTO) { + if (dev->type == ARPHRD_ETHER) + ifs->type = IF_PROTO_FR_ETH_PVC; + else + ifs->type = IF_PROTO_FR_PVC; + + if (ifs->size < sizeof(info)) { + /* data size wanted */ + ifs->size = sizeof(info); + return -ENOBUFS; + } + + info.dlci = pvc->dlci; + memcpy(info.master, pvc->frad->name, IFNAMSIZ); + if (copy_to_user(ifs->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) +{ + struct pvc_device *pvc = dev->ml_priv; + + if (!pvc->state.active) + goto drop; + + if (dev->type == ARPHRD_ETHER) { + int pad = ETH_ZLEN - skb->len; + + if (pad > 0) { /* Pad the frame with zeros */ + if (__skb_pad(skb, pad, false)) + goto drop; + skb_put(skb, pad); + } + } + + /* We already requested the header space with dev->needed_headroom. + * So this is just a protection in case the upper layer didn't take + * dev->needed_headroom into consideration. + */ + if (skb_headroom(skb) < 10) { + struct sk_buff *skb2 = skb_realloc_headroom(skb, 10); + + if (!skb2) + goto drop; + dev_kfree_skb(skb); + skb = skb2; + } + + skb->dev = dev; + if (fr_hard_header(skb, pvc->dlci)) + goto drop; + + 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; + skb->protocol = htons(ETH_P_HDLC); + skb_reset_network_header(skb); + dev_queue_xmit(skb); + return NETDEV_TX_OK; + +drop: + dev->stats.tx_dropped++; + kfree_skb(skb); + return NETDEV_TX_OK; +} + +static inline void fr_log_dlci_active(struct 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; + struct 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) + return; + + memset(skb->data, 0, len); + skb_reserve(skb, 4); + if (lmi == LMI_CISCO) + fr_hard_header(skb, LMI_CISCO_DLCI); + else + 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->protocol = htons(ETH_P_HDLC); + 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); + struct 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(struct timer_list *t) +{ + struct frad_state *st = from_timer(st, t, timer); + struct net_device *dev = st->dev; + 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; + } + + 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); + struct 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_snap_parse(struct sk_buff *skb, struct pvc_device *pvc) +{ + /* OUI 00-00-00 indicates an Ethertype follows */ + if (skb->data[0] == 0x00 && + skb->data[1] == 0x00 && + skb->data[2] == 0x00) { + if (!pvc->main) + return -1; + skb->dev = pvc->main; + skb->protocol = *(__be16 *)(skb->data + 3); /* Ethertype */ + skb_pull(skb, 5); + skb_reset_mac_header(skb); + return 0; + + /* OUI 00-80-C2 stands for the 802.1 organization */ + } else if (skb->data[0] == 0x00 && + skb->data[1] == 0x80 && + skb->data[2] == 0xC2) { + /* PID 00-07 stands for Ethernet frames without FCS */ + if (skb->data[3] == 0x00 && + skb->data[4] == 0x07) { + if (!pvc->ether) + return -1; + skb_pull(skb, 5); + if (skb->len < ETH_HLEN) + return -1; + skb->protocol = eth_type_trans(skb, pvc->ether); + return 0; + + /* PID unsupported */ + } else { + return -1; + } + + /* OUI unsupported */ + } else { + return -1; + } +} + +static int fr_rx(struct sk_buff *skb) +{ + struct net_device *frad = skb->dev; + hdlc_device *hdlc = dev_to_hdlc(frad); + struct fr_hdr *fh = (struct fr_hdr *)skb->data; + u8 *data = skb->data; + u16 dlci; + struct pvc_device *pvc; + struct net_device *dev; + + if (skb->len < 4 || fh->ea1 || !fh->ea2 || 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 + goto 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; + } + + skb = skb_share_check(skb, GFP_ATOMIC); + if (!skb) { + frad->stats.rx_dropped++; + return NET_RX_DROP; + } + + if (data[3] == NLPID_IP) { + if (!pvc->main) + goto rx_drop; + skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ + skb->dev = pvc->main; + skb->protocol = htons(ETH_P_IP); + skb_reset_mac_header(skb); + + } else if (data[3] == NLPID_IPV6) { + if (!pvc->main) + goto rx_drop; + skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ + skb->dev = pvc->main; + skb->protocol = htons(ETH_P_IPV6); + skb_reset_mac_header(skb); + + } else if (data[3] == FR_PAD) { + if (skb->len < 5) + goto rx_error; + if (data[4] == NLPID_SNAP) { /* A SNAP header follows */ + skb_pull(skb, 5); + if (skb->len < 5) /* Incomplete SNAP header */ + goto rx_error; + if (fr_snap_parse(skb, pvc)) + goto rx_drop; + } else { + goto rx_drop; + } + + } else { + netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n", + data[3], skb->len); + goto rx_drop; + } + + dev = skb->dev; + dev->stats.rx_packets++; /* PVC traffic */ + dev->stats.rx_bytes += skb->len; + if (pvc->state.becn) + dev->stats.rx_compressed++; + netif_rx(skb); + return NET_RX_SUCCESS; + +rx_error: + frad->stats.rx_errors++; /* Mark error */ +rx_drop: + 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; + + state(hdlc)->dev = dev; + timer_setup(&state(hdlc)->timer, fr_timer, 0); + /* First poll after 1 s */ + state(hdlc)->timer.expires = jiffies + HZ; + 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); + struct 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 = 0; + dev->addr_len = 2; + netif_keep_dst(dev); +} + +static const struct net_device_ops pvc_ops = { + .ndo_open = pvc_open, + .ndo_stop = pvc_close, + .ndo_start_xmit = pvc_xmit, + .ndo_siocwandev = pvc_ioctl, +}; + +static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type) +{ + hdlc_device *hdlc = dev_to_hdlc(frad); + struct pvc_device *pvc; + struct net_device *dev; + int used; + + pvc = add_pvc(frad, dlci); + if (!pvc) { + 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", NET_NAME_UNKNOWN, + ether_setup); + else + dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup); + + if (!dev) { + netdev_warn(frad, "Memory squeeze on fr_pvc()\n"); + delete_unused_pvcs(hdlc); + return -ENOBUFS; + } + + if (type == ARPHRD_ETHER) { + dev->priv_flags &= ~IFF_TX_SKB_SHARING; + eth_hw_addr_random(dev); + } else { + __be16 addr = htons(dlci); + + dev_addr_set(dev, (u8 *)&addr); + dlci_to_q922(dev->broadcast, dlci); + } + dev->netdev_ops = &pvc_ops; + dev->mtu = HDLC_MAX_MTU; + dev->min_mtu = 68; + dev->max_mtu = HDLC_MAX_MTU; + dev->needed_headroom = 10; + dev->priv_flags |= IFF_NO_QUEUE; + dev->ml_priv = pvc; + + if (register_netdevice(dev) != 0) { + free_netdev(dev); + delete_unused_pvcs(hdlc); + return -EIO; + } + + dev->needs_free_netdev = true; + *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) +{ + struct pvc_device *pvc; + struct net_device *dev; + + pvc = find_pvc(hdlc, dlci); + if (!pvc) + return -ENOENT; + + dev = *get_dev_p(pvc, type); + if (!dev) + 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); + struct 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) { + struct 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 if_settings *ifs) +{ + fr_proto __user *fr_s = ifs->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 (ifs->type) { + case IF_GET_PROTO: + if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */ + return -EINVAL; + ifs->type = IF_PROTO_FR; + if (ifs->size < size) { + ifs->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; + call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); + 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, ifs->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 (ifs->type == IF_PROTO_FR_ADD_ETH_PVC || + ifs->type == IF_PROTO_FR_DEL_ETH_PVC) + result = ARPHRD_ETHER; /* bridged Ethernet device */ + else + result = ARPHRD_DLCI; + + if (ifs->type == IF_PROTO_FR_ADD_PVC || + ifs->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 hdlc_fr_init(void) +{ + register_hdlc_protocol(&proto); + return 0; +} + +static void __exit hdlc_fr_exit(void) +{ + unregister_hdlc_protocol(&proto); +} + +module_init(hdlc_fr_init); +module_exit(hdlc_fr_exit); + +MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); +MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC"); +MODULE_LICENSE("GPL v2"); |