diff options
Diffstat (limited to 'net/atm/lec.c')
| -rw-r--r-- | net/atm/lec.c | 2538 |
1 files changed, 2538 insertions, 0 deletions
diff --git a/net/atm/lec.c b/net/atm/lec.c new file mode 100644 index 00000000000..a0752487026 --- /dev/null +++ b/net/atm/lec.c @@ -0,0 +1,2538 @@ +/* + * lec.c: Lan Emulation driver + * Marko Kiiskila mkiiskila@yahoo.com + * + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/bitops.h> + +/* We are ethernet device */ +#include <linux/if_ether.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <net/sock.h> +#include <linux/skbuff.h> +#include <linux/ip.h> +#include <asm/byteorder.h> +#include <asm/uaccess.h> +#include <net/arp.h> +#include <net/dst.h> +#include <linux/proc_fs.h> +#include <linux/spinlock.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> + +/* TokenRing if needed */ +#ifdef CONFIG_TR +#include <linux/trdevice.h> +#endif + +/* And atm device */ +#include <linux/atmdev.h> +#include <linux/atmlec.h> + +/* Proxy LEC knows about bridging */ +#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) +#include <linux/if_bridge.h> +#include "../bridge/br_private.h" + +static unsigned char bridge_ula_lec[] = {0x01, 0x80, 0xc2, 0x00, 0x00}; +#endif + +/* Modular too */ +#include <linux/module.h> +#include <linux/init.h> + +#include "lec.h" +#include "lec_arpc.h" +#include "resources.h" + +#if 0 +#define DPRINTK printk +#else +#define DPRINTK(format,args...) +#endif + +#define DUMP_PACKETS 0 /* 0 = None, + * 1 = 30 first bytes + * 2 = Whole packet + */ + +#define LEC_UNRES_QUE_LEN 8 /* number of tx packets to queue for a + single destination while waiting for SVC */ + +static int lec_open(struct net_device *dev); +static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev); +static int lec_close(struct net_device *dev); +static struct net_device_stats *lec_get_stats(struct net_device *dev); +static void lec_init(struct net_device *dev); +static struct lec_arp_table* lec_arp_find(struct lec_priv *priv, + unsigned char *mac_addr); +static int lec_arp_remove(struct lec_priv *priv, + struct lec_arp_table *to_remove); +/* LANE2 functions */ +static void lane2_associate_ind (struct net_device *dev, u8 *mac_address, + u8 *tlvs, u32 sizeoftlvs); +static int lane2_resolve(struct net_device *dev, u8 *dst_mac, int force, + u8 **tlvs, u32 *sizeoftlvs); +static int lane2_associate_req (struct net_device *dev, u8 *lan_dst, + u8 *tlvs, u32 sizeoftlvs); + +static int lec_addr_delete(struct lec_priv *priv, unsigned char *atm_addr, + unsigned long permanent); +static void lec_arp_check_empties(struct lec_priv *priv, + struct atm_vcc *vcc, struct sk_buff *skb); +static void lec_arp_destroy(struct lec_priv *priv); +static void lec_arp_init(struct lec_priv *priv); +static struct atm_vcc* lec_arp_resolve(struct lec_priv *priv, + unsigned char *mac_to_find, + int is_rdesc, + struct lec_arp_table **ret_entry); +static void lec_arp_update(struct lec_priv *priv, unsigned char *mac_addr, + unsigned char *atm_addr, unsigned long remoteflag, + unsigned int targetless_le_arp); +static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id); +static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc); +static void lec_set_flush_tran_id(struct lec_priv *priv, + unsigned char *atm_addr, + unsigned long tran_id); +static void lec_vcc_added(struct lec_priv *priv, struct atmlec_ioc *ioc_data, + struct atm_vcc *vcc, + void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb)); +static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc); + +static struct lane2_ops lane2_ops = { + lane2_resolve, /* resolve, spec 3.1.3 */ + lane2_associate_req, /* associate_req, spec 3.1.4 */ + NULL /* associate indicator, spec 3.1.5 */ +}; + +static unsigned char bus_mac[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff}; + +/* Device structures */ +static struct net_device *dev_lec[MAX_LEC_ITF]; + +#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) +static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev) +{ + struct ethhdr *eth; + char *buff; + struct lec_priv *priv; + + /* Check if this is a BPDU. If so, ask zeppelin to send + * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit + * as the Config BPDU has */ + eth = (struct ethhdr *)skb->data; + buff = skb->data + skb->dev->hard_header_len; + if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) { + struct sock *sk; + struct sk_buff *skb2; + struct atmlec_msg *mesg; + + skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); + if (skb2 == NULL) return; + skb2->len = sizeof(struct atmlec_msg); + mesg = (struct atmlec_msg *)skb2->data; + mesg->type = l_topology_change; + buff += 4; + mesg->content.normal.flag = *buff & 0x01; /* 0x01 is topology change */ + + priv = (struct lec_priv *)dev->priv; + atm_force_charge(priv->lecd, skb2->truesize); + sk = sk_atm(priv->lecd); + skb_queue_tail(&sk->sk_receive_queue, skb2); + sk->sk_data_ready(sk, skb2->len); + } + + return; +} +#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */ + +/* + * Modelled after tr_type_trans + * All multicast and ARE or STE frames go to BUS. + * Non source routed frames go by destination address. + * Last hop source routed frames go by destination address. + * Not last hop source routed frames go by _next_ route descriptor. + * Returns pointer to destination MAC address or fills in rdesc + * and returns NULL. + */ +#ifdef CONFIG_TR +static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc) +{ + struct trh_hdr *trh; + int riflen, num_rdsc; + + trh = (struct trh_hdr *)packet; + if (trh->daddr[0] & (uint8_t)0x80) + return bus_mac; /* multicast */ + + if (trh->saddr[0] & TR_RII) { + riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8; + if ((ntohs(trh->rcf) >> 13) != 0) + return bus_mac; /* ARE or STE */ + } + else + return trh->daddr; /* not source routed */ + + if (riflen < 6) + return trh->daddr; /* last hop, source routed */ + + /* riflen is 6 or more, packet has more than one route descriptor */ + num_rdsc = (riflen/2) - 1; + memset(rdesc, 0, ETH_ALEN); + /* offset 4 comes from LAN destination field in LE control frames */ + if (trh->rcf & htons((uint16_t)TR_RCF_DIR_BIT)) + memcpy(&rdesc[4], &trh->rseg[num_rdsc-2], sizeof(uint16_t)); + else { + memcpy(&rdesc[4], &trh->rseg[1], sizeof(uint16_t)); + rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0)); + } + + return NULL; +} +#endif /* CONFIG_TR */ + +/* + * Open/initialize the netdevice. This is called (in the current kernel) + * sometime after booting when the 'ifconfig' program is run. + * + * This routine should set everything up anew at each open, even + * registers that "should" only need to be set once at boot, so that + * there is non-reboot way to recover if something goes wrong. + */ + +static int +lec_open(struct net_device *dev) +{ + struct lec_priv *priv = (struct lec_priv *)dev->priv; + + netif_start_queue(dev); + memset(&priv->stats,0,sizeof(struct net_device_stats)); + + return 0; +} + +static __inline__ void +lec_send(struct atm_vcc *vcc, struct sk_buff *skb, struct lec_priv *priv) +{ + ATM_SKB(skb)->vcc = vcc; + ATM_SKB(skb)->atm_options = vcc->atm_options; + + atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); + if (vcc->send(vcc, skb) < 0) { + priv->stats.tx_dropped++; + return; + } + + priv->stats.tx_packets++; + priv->stats.tx_bytes += skb->len; +} + +static void +lec_tx_timeout(struct net_device *dev) +{ + printk(KERN_INFO "%s: tx timeout\n", dev->name); + dev->trans_start = jiffies; + netif_wake_queue(dev); +} + +static int +lec_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct sk_buff *skb2; + struct lec_priv *priv = (struct lec_priv *)dev->priv; + struct lecdatahdr_8023 *lec_h; + struct atm_vcc *vcc; + struct lec_arp_table *entry; + unsigned char *dst; + int min_frame_size; +#ifdef CONFIG_TR + unsigned char rdesc[ETH_ALEN]; /* Token Ring route descriptor */ +#endif + int is_rdesc; +#if DUMP_PACKETS > 0 + char buf[300]; + int i=0; +#endif /* DUMP_PACKETS >0 */ + + DPRINTK("lec_start_xmit called\n"); + if (!priv->lecd) { + printk("%s:No lecd attached\n",dev->name); + priv->stats.tx_errors++; + netif_stop_queue(dev); + return -EUNATCH; + } + + DPRINTK("skbuff head:%lx data:%lx tail:%lx end:%lx\n", + (long)skb->head, (long)skb->data, (long)skb->tail, + (long)skb->end); +#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) + if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0) + lec_handle_bridge(skb, dev); +#endif + + /* Make sure we have room for lec_id */ + if (skb_headroom(skb) < 2) { + + DPRINTK("lec_start_xmit: reallocating skb\n"); + skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN); + kfree_skb(skb); + if (skb2 == NULL) return 0; + skb = skb2; + } + skb_push(skb, 2); + + /* Put le header to place, works for TokenRing too */ + lec_h = (struct lecdatahdr_8023*)skb->data; + lec_h->le_header = htons(priv->lecid); + +#ifdef CONFIG_TR + /* Ugly. Use this to realign Token Ring packets for + * e.g. PCA-200E driver. */ + if (priv->is_trdev) { + skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN); + kfree_skb(skb); + if (skb2 == NULL) return 0; + skb = skb2; + } +#endif + +#if DUMP_PACKETS > 0 + printk("%s: send datalen:%ld lecid:%4.4x\n", dev->name, + skb->len, priv->lecid); +#if DUMP_PACKETS >= 2 + for(i=0;i<skb->len && i <99;i++) { + sprintf(buf+i*3,"%2.2x ",0xff&skb->data[i]); + } +#elif DUMP_PACKETS >= 1 + for(i=0;i<skb->len && i < 30;i++) { + sprintf(buf+i*3,"%2.2x ", 0xff&skb->data[i]); + } +#endif /* DUMP_PACKETS >= 1 */ + if (i==skb->len) + printk("%s\n",buf); + else + printk("%s...\n",buf); +#endif /* DUMP_PACKETS > 0 */ + + /* Minimum ethernet-frame size */ +#ifdef CONFIG_TR + if (priv->is_trdev) + min_frame_size = LEC_MINIMUM_8025_SIZE; + else +#endif + min_frame_size = LEC_MINIMUM_8023_SIZE; + if (skb->len < min_frame_size) { + if ((skb->len + skb_tailroom(skb)) < min_frame_size) { + skb2 = skb_copy_expand(skb, 0, + min_frame_size - skb->truesize, GFP_ATOMIC); + dev_kfree_skb(skb); + if (skb2 == NULL) { + priv->stats.tx_dropped++; + return 0; + } + skb = skb2; + } + skb_put(skb, min_frame_size - skb->len); + } + + /* Send to right vcc */ + is_rdesc = 0; + dst = lec_h->h_dest; +#ifdef CONFIG_TR + if (priv->is_trdev) { + dst = get_tr_dst(skb->data+2, rdesc); + if (dst == NULL) { + dst = rdesc; + is_rdesc = 1; + } + } +#endif + entry = NULL; + vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry); + DPRINTK("%s:vcc:%p vcc_flags:%x, entry:%p\n", dev->name, + vcc, vcc?vcc->flags:0, entry); + if (!vcc || !test_bit(ATM_VF_READY,&vcc->flags)) { + if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) { + DPRINTK("%s:lec_start_xmit: queuing packet, ", dev->name); + DPRINTK("MAC address 0x%02x:%02x:%02x:%02x:%02x:%02x\n", + lec_h->h_dest[0], lec_h->h_dest[1], lec_h->h_dest[2], + lec_h->h_dest[3], lec_h->h_dest[4], lec_h->h_dest[5]); + skb_queue_tail(&entry->tx_wait, skb); + } else { + DPRINTK("%s:lec_start_xmit: tx queue full or no arp entry, dropping, ", dev->name); + DPRINTK("MAC address 0x%02x:%02x:%02x:%02x:%02x:%02x\n", + lec_h->h_dest[0], lec_h->h_dest[1], lec_h->h_dest[2], + lec_h->h_dest[3], lec_h->h_dest[4], lec_h->h_dest[5]); + priv->stats.tx_dropped++; + dev_kfree_skb(skb); + } + return 0; + } + +#if DUMP_PACKETS > 0 + printk("%s:sending to vpi:%d vci:%d\n", dev->name, + vcc->vpi, vcc->vci); +#endif /* DUMP_PACKETS > 0 */ + + while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) { + DPRINTK("lec.c: emptying tx queue, "); + DPRINTK("MAC address 0x%02x:%02x:%02x:%02x:%02x:%02x\n", + lec_h->h_dest[0], lec_h->h_dest[1], lec_h->h_dest[2], + lec_h->h_dest[3], lec_h->h_dest[4], lec_h->h_dest[5]); + lec_send(vcc, skb2, priv); + } + + lec_send(vcc, skb, priv); + + if (!atm_may_send(vcc, 0)) { + struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); + + vpriv->xoff = 1; + netif_stop_queue(dev); + + /* + * vcc->pop() might have occurred in between, making + * the vcc usuable again. Since xmit is serialized, + * this is the only situation we have to re-test. + */ + + if (atm_may_send(vcc, 0)) + netif_wake_queue(dev); + } + + dev->trans_start = jiffies; + return 0; +} + +/* The inverse routine to net_open(). */ +static int +lec_close(struct net_device *dev) +{ + netif_stop_queue(dev); + return 0; +} + +/* + * Get the current statistics. + * This may be called with the card open or closed. + */ +static struct net_device_stats * +lec_get_stats(struct net_device *dev) +{ + return &((struct lec_priv *)dev->priv)->stats; +} + +static int +lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) +{ + unsigned long flags; + struct net_device *dev = (struct net_device*)vcc->proto_data; + struct lec_priv *priv = (struct lec_priv*)dev->priv; + struct atmlec_msg *mesg; + struct lec_arp_table *entry; + int i; + char *tmp; /* FIXME */ + + atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); + mesg = (struct atmlec_msg *)skb->data; + tmp = skb->data; + tmp += sizeof(struct atmlec_msg); + DPRINTK("%s: msg from zeppelin:%d\n", dev->name, mesg->type); + switch(mesg->type) { + case l_set_mac_addr: + for (i=0;i<6;i++) { + dev->dev_addr[i] = mesg->content.normal.mac_addr[i]; + } + break; + case l_del_mac_addr: + for(i=0;i<6;i++) { + dev->dev_addr[i] = 0; + } + break; + case l_addr_delete: + lec_addr_delete(priv, mesg->content.normal.atm_addr, + mesg->content.normal.flag); + break; + case l_topology_change: + priv->topology_change = mesg->content.normal.flag; + break; + case l_flush_complete: + lec_flush_complete(priv, mesg->content.normal.flag); + break; + case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */ + spin_lock_irqsave(&priv->lec_arp_lock, flags); + entry = lec_arp_find(priv, mesg->content.normal.mac_addr); + lec_arp_remove(priv, entry); + spin_unlock_irqrestore(&priv->lec_arp_lock, flags); + + if (mesg->content.normal.no_source_le_narp) + break; + /* FALL THROUGH */ + case l_arp_update: + lec_arp_update(priv, mesg->content.normal.mac_addr, + mesg->content.normal.atm_addr, + mesg->content.normal.flag, + mesg->content.normal.targetless_le_arp); + DPRINTK("lec: in l_arp_update\n"); + if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */ + DPRINTK("lec: LANE2 3.1.5, got tlvs, size %d\n", mesg->sizeoftlvs); + lane2_associate_ind(dev, + mesg->content.normal.mac_addr, + tmp, mesg->sizeoftlvs); + } + break; + case l_config: + priv->maximum_unknown_frame_count = + mesg->content.config.maximum_unknown_frame_count; + priv->max_unknown_frame_time = + (mesg->content.config.max_unknown_frame_time*HZ); + priv->max_retry_count = + mesg->content.config.max_retry_count; + priv->aging_time = (mesg->content.config.aging_time*HZ); + priv->forward_delay_time = + (mesg->content.config.forward_delay_time*HZ); + priv->arp_response_time = + (mesg->content.config.arp_response_time*HZ); + priv->flush_timeout = (mesg->content.config.flush_timeout*HZ); + priv->path_switching_delay = + (mesg->content.config.path_switching_delay*HZ); + priv->lane_version = mesg->content.config.lane_version; /* LANE2 */ + priv->lane2_ops = NULL; + if (priv->lane_version > 1) + priv->lane2_ops = &lane2_ops; + if (dev->change_mtu(dev, mesg->content.config.mtu)) + printk("%s: change_mtu to %d failed\n", dev->name, + mesg->content.config.mtu); + priv->is_proxy = mesg->content.config.is_proxy; + break; + case l_flush_tran_id: + lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr, + mesg->content.normal.flag); + break; + case l_set_lecid: + priv->lecid=(unsigned short)(0xffff&mesg->content.normal.flag); + break; + case l_should_bridge: { +#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) + struct net_bridge_fdb_entry *f; + + DPRINTK("%s: bridge zeppelin asks about 0x%02x:%02x:%02x:%02x:%02x:%02x\n", + dev->name, + mesg->content.proxy.mac_addr[0], mesg->content.proxy.mac_addr[1], + mesg->content.proxy.mac_addr[2], mesg->content.proxy.mac_addr[3], + mesg->content.proxy.mac_addr[4], mesg->content.proxy.mac_addr[5]); + + if (br_fdb_get_hook == NULL || dev->br_port == NULL) + break; + + f = br_fdb_get_hook(dev->br_port->br, mesg->content.proxy.mac_addr); + if (f != NULL && + f->dst->dev != dev && + f->dst->state == BR_STATE_FORWARDING) { + /* hit from bridge table, send LE_ARP_RESPONSE */ + struct sk_buff *skb2; + struct sock *sk; + + DPRINTK("%s: entry found, responding to zeppelin\n", dev->name); + skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); + if (skb2 == NULL) { + br_fdb_put_hook(f); + break; + } + skb2->len = sizeof(struct atmlec_msg); + memcpy(skb2->data, mesg, sizeof(struct atmlec_msg)); + atm_force_charge(priv->lecd, skb2->truesize); + sk = sk_atm(priv->lecd); + skb_queue_tail(&sk->sk_receive_queue, skb2); + sk->sk_data_ready(sk, skb2->len); + } + if (f != NULL) br_fdb_put_hook(f); +#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */ + } + break; + default: + printk("%s: Unknown message type %d\n", dev->name, mesg->type); + dev_kfree_skb(skb); + return -EINVAL; + } + dev_kfree_skb(skb); + return 0; +} + +static void +lec_atm_close(struct atm_vcc *vcc) +{ + struct sk_buff *skb; + struct net_device *dev = (struct net_device *)vcc->proto_data; + struct lec_priv *priv = (struct lec_priv *)dev->priv; + + priv->lecd = NULL; + /* Do something needful? */ + + netif_stop_queue(dev); + lec_arp_destroy(priv); + + if (skb_peek(&sk_atm(vcc)->sk_receive_queue)) + printk("%s lec_atm_close: closing with messages pending\n", + dev->name); + while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue)) != NULL) { + atm_return(vcc, skb->truesize); + dev_kfree_skb(skb); + } + + printk("%s: Shut down!\n", dev->name); + module_put(THIS_MODULE); +} + +static struct atmdev_ops lecdev_ops = { + .close = lec_atm_close, + .send = lec_atm_send +}; + +static struct atm_dev lecatm_dev = { + .ops = &lecdev_ops, + .type = "lec", + .number = 999, /* dummy device number */ + .lock = SPIN_LOCK_UNLOCKED +}; + +/* + * LANE2: new argument struct sk_buff *data contains + * the LE_ARP based TLVs introduced in the LANE2 spec + */ +static int +send_to_lecd(struct lec_priv *priv, atmlec_msg_type type, + unsigned char *mac_addr, unsigned char *atm_addr, + struct sk_buff *data) +{ + struct sock *sk; + struct sk_buff *skb; + struct atmlec_msg *mesg; + + if (!priv || !priv->lecd) { + return -1; + } + skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC); + if (!skb) + return -1; + skb->len = sizeof(struct atmlec_msg); + mesg = (struct atmlec_msg *)skb->data; + memset(mesg, 0, sizeof(struct atmlec_msg)); + mesg->type = type; + if (data != NULL) + mesg->sizeoftlvs = data->len; + if (mac_addr) + memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN); + else + mesg->content.normal.targetless_le_arp = 1; + if (atm_addr) + memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN); + + atm_force_charge(priv->lecd, skb->truesize); + sk = sk_atm(priv->lecd); + skb_queue_tail(&sk->sk_receive_queue, skb); + sk->sk_data_ready(sk, skb->len); + + if (data != NULL) { + DPRINTK("lec: about to send %d bytes of data\n", data->len); + atm_force_charge(priv->lecd, data->truesize); + skb_queue_tail(&sk->sk_receive_queue, data); + sk->sk_data_ready(sk, skb->len); + } + + return 0; +} + +/* shamelessly stolen from drivers/net/net_init.c */ +static int lec_change_mtu(struct net_device *dev, int new_mtu) +{ + if ((new_mtu < 68) || (new_mtu > 18190)) + return -EINVAL; + dev->mtu = new_mtu; + return 0; +} + +static void lec_set_multicast_list(struct net_device *dev) +{ + /* by default, all multicast frames arrive over the bus. + * eventually support selective multicast service + */ + return; +} + +static void +lec_init(struct net_device *dev) +{ + dev->change_mtu = lec_change_mtu; + dev->open = lec_open; + dev->stop = lec_close; + dev->hard_start_xmit = lec_start_xmit; + dev->tx_timeout = lec_tx_timeout; + + dev->get_stats = lec_get_stats; + dev->set_multicast_list = lec_set_multicast_list; + dev->do_ioctl = NULL; + printk("%s: Initialized!\n",dev->name); + return; +} + +static unsigned char lec_ctrl_magic[] = { + 0xff, + 0x00, + 0x01, + 0x01 }; + +static void +lec_push(struct atm_vcc *vcc, struct sk_buff *skb) +{ + struct net_device *dev = (struct net_device *)vcc->proto_data; + struct lec_priv *priv = (struct lec_priv *)dev->priv; + +#if DUMP_PACKETS >0 + int i=0; + char buf[300]; + + printk("%s: lec_push vcc vpi:%d vci:%d\n", dev->name, + vcc->vpi, vcc->vci); +#endif + if (!skb) { + DPRINTK("%s: null skb\n",dev->name); + lec_vcc_close(priv, vcc); + return; + } +#if DUMP_PACKETS > 0 + printk("%s: rcv datalen:%ld lecid:%4.4x\n", dev->name, + skb->len, priv->lecid); +#if DUMP_PACKETS >= 2 + for(i=0;i<skb->len && i <99;i++) { + sprintf(buf+i*3,"%2.2x ",0xff&skb->data[i]); + } +#elif DUMP_PACKETS >= 1 + for(i=0;i<skb->len && i < 30;i++) { + sprintf(buf+i*3,"%2.2x ", 0xff&skb->data[i]); + } +#endif /* DUMP_PACKETS >= 1 */ + if (i==skb->len) + printk("%s\n",buf); + else + printk("%s...\n",buf); +#endif /* DUMP_PACKETS > 0 */ + if (memcmp(skb->data, lec_ctrl_magic, 4) ==0) { /* Control frame, to daemon*/ + struct sock *sk = sk_atm(vcc); + + DPRINTK("%s: To daemon\n",dev->name); + skb_queue_tail(&sk->sk_receive_queue, skb); + sk->sk_data_ready(sk, skb->len); + } else { /* Data frame, queue to protocol handlers */ + unsigned char *dst; + + atm_return(vcc,skb->truesize); + if (*(uint16_t *)skb->data == htons(priv->lecid) || + !priv->lecd || + !(dev->flags & IFF_UP)) { + /* Probably looping back, or if lecd is missing, + lecd has gone down */ + DPRINTK("Ignoring frame...\n"); + dev_kfree_skb(skb); + return; + } +#ifdef CONFIG_TR + if (priv->is_trdev) dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest; + else +#endif + dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest; + + if (!(dst[0]&0x01) && /* Never filter Multi/Broadcast */ + !priv->is_proxy && /* Proxy wants all the packets */ + memcmp(dst, dev->dev_addr, dev->addr_len)) { + dev_kfree_skb(skb); + return; + } + if (priv->lec_arp_empty_ones) { + lec_arp_check_empties(priv, vcc, skb); + } + skb->dev = dev; + skb_pull(skb, 2); /* skip lec_id */ +#ifdef CONFIG_TR + if (priv->is_trdev) skb->protocol = tr_type_trans(skb, dev); + else +#endif + skb->protocol = eth_type_trans(skb, dev); + priv->stats.rx_packets++; + priv->stats.rx_bytes += skb->len; + memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); + netif_rx(skb); + } +} + +static void +lec_pop(struct atm_vcc *vcc, struct sk_buff *skb) +{ + struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); + struct net_device *dev = skb->dev; + + if (vpriv == NULL) { + printk("lec_pop(): vpriv = NULL!?!?!?\n"); + return; + } + + vpriv->old_pop(vcc, skb); + + if (vpriv->xoff && atm_may_send(vcc, 0)) { + vpriv->xoff = 0; + if (netif_running(dev) && netif_queue_stopped(dev)) + netif_wake_queue(dev); + } +} + +static int +lec_vcc_attach(struct atm_vcc *vcc, void __user *arg) +{ + struct lec_vcc_priv *vpriv; + int bytes_left; + struct atmlec_ioc ioc_data; + + /* Lecd must be up in this case */ + bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc)); + if (bytes_left != 0) { + printk("lec: lec_vcc_attach, copy from user failed for %d bytes\n", + bytes_left); + } + if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF || + !dev_lec[ioc_data.dev_num]) + return -EINVAL; + if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL))) + return -ENOMEM; + vpriv->xoff = 0; + vpriv->old_pop = vcc->pop; + vcc->user_back = vpriv; + vcc->pop = lec_pop; + lec_vcc_added(dev_lec[ioc_data.dev_num]->priv, + &ioc_data, vcc, vcc->push); + vcc->proto_data = dev_lec[ioc_data.dev_num]; + vcc->push = lec_push; + return 0; +} + +static int +lec_mcast_attach(struct atm_vcc *vcc, int arg) +{ + if (arg <0 || arg >= MAX_LEC_ITF || !dev_lec[arg]) + return -EINVAL; + vcc->proto_data = dev_lec[arg]; + return (lec_mcast_make((struct lec_priv*)dev_lec[arg]->priv, vcc)); +} + +/* Initialize device. */ +static int +lecd_attach(struct atm_vcc *vcc, int arg) +{ + int i; + struct lec_priv *priv; + + if (arg<0) + i = 0; + else + i = arg; +#ifdef CONFIG_TR + if (arg >= MAX_LEC_ITF) + return -EINVAL; +#else /* Reserve the top NUM_TR_DEVS for TR */ + if (arg >= (MAX_LEC_ITF-NUM_TR_DEVS)) + return -EINVAL; +#endif + if (!dev_lec[i]) { + int is_trdev, size; + + is_trdev = 0; + if (i >= (MAX_LEC_ITF - NUM_TR_DEVS)) + is_trdev = 1; + + size = sizeof(struct lec_priv); +#ifdef CONFIG_TR + if (is_trdev) + dev_lec[i] = alloc_trdev(size); + else +#endif + dev_lec[i] = alloc_etherdev(size); + if (!dev_lec[i]) + return -ENOMEM; + snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i); + if (register_netdev(dev_lec[i])) { + free_netdev(dev_lec[i]); + return -EINVAL; + } + + priv = dev_lec[i]->priv; + priv->is_trdev = is_trdev; + lec_init(dev_lec[i]); + } else { + priv = dev_lec[i]->priv; + if (priv->lecd) + return -EADDRINUSE; + } + lec_arp_init(priv); + priv->itfnum = i; /* LANE2 addition */ + priv->lecd = vcc; + vcc->dev = &lecatm_dev; + vcc_insert_socket(sk_atm(vcc)); + + vcc->proto_data = dev_lec[i]; + set_bit(ATM_VF_META,&vcc->flags); + set_bit(ATM_VF_READY,&vcc->flags); + + /* Set default values to these variables */ + priv->maximum_unknown_frame_count = 1; + priv->max_unknown_frame_time = (1*HZ); + priv->vcc_timeout_period = (1200*HZ); + priv->max_retry_count = 1; + priv->aging_time = (300*HZ); + priv->forward_delay_time = (15*HZ); + priv->topology_change = 0; + priv->arp_response_time = (1*HZ); + priv->flush_timeout = (4*HZ); + priv->path_switching_delay = (6*HZ); + + if (dev_lec[i]->flags & IFF_UP) { + netif_start_queue(dev_lec[i]); + } + __module_get(THIS_MODULE); + return i; +} + +#ifdef CONFIG_PROC_FS +static char* lec_arp_get_status_string(unsigned char status) +{ + static char *lec_arp_status_string[] = { + "ESI_UNKNOWN ", + "ESI_ARP_PENDING ", + "ESI_VC_PENDING ", + "<Undefined> ", + "ESI_FLUSH_PENDING ", + "ESI_FORWARD_DIRECT" + }; + + if (status > ESI_FORWARD_DIRECT) + status = 3; /* ESI_UNDEFINED */ + return lec_arp_status_string[status]; +} + +static void lec_info(struct seq_file *seq, struct lec_arp_table *entry) +{ + int i; + + for (i = 0; i < ETH_ALEN; i++) + seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff); + seq_printf(seq, " "); + for (i = 0; i < ATM_ESA_LEN; i++) + seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff); + seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status), + entry->flags & 0xffff); + if (entry->vcc) + seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci); + else + seq_printf(seq, " "); + if (entry->recv_vcc) { + seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi, + entry->recv_vcc->vci); + } + seq_putc(seq, '\n'); +} + + +struct lec_state { + unsigned long flags; + struct lec_priv *locked; + struct lec_arp_table *entry; + struct net_device *dev; + int itf; + int arp_table; + int misc_table; +}; + +static void *lec_tbl_walk(struct lec_state *state, struct lec_arp_table *tbl, + loff_t *l) +{ + struct lec_arp_table *e = state->entry; + + if (!e) + e = tbl; + if (e == (void *)1) { + e = tbl; + --*l; + } + for (; e; e = e->next) { + if (--*l < 0) + break; + } + state->entry = e; + return (*l < 0) ? state : NULL; +} + +static void *lec_arp_walk(struct lec_state *state, loff_t *l, + struct lec_priv *priv) +{ + void *v = NULL; + int p; + + for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) { + v = lec_tbl_walk(state, priv->lec_arp_tables[p], l); + if (v) + break; + } + state->arp_table = p; + return v; +} + +static void *lec_misc_walk(struct lec_state *state, loff_t *l, + struct lec_priv *priv) +{ + struct lec_arp_table *lec_misc_tables[] = { + priv->lec_arp_empty_ones, + priv->lec_no_forward, + priv->mcast_fwds + }; + void *v = NULL; + int q; + + for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) { + v = lec_tbl_walk(state, lec_misc_tables[q], l); + if (v) + break; + } + state->misc_table = q; + return v; +} + +static void *lec_priv_walk(struct lec_state *state, loff_t *l, + struct lec_priv *priv) +{ + if (!state->locked) { + state->locked = priv; + spin_lock_irqsave(&priv->lec_arp_lock, state->flags); + } + if (!lec_arp_walk(state, l, priv) && + !lec_misc_walk(state, l, priv)) { + spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags); + state->locked = NULL; + /* Partial state reset for the next time we get called */ + state->arp_table = state->misc_table = 0; + } + return state->locked; +} + +static void *lec_itf_walk(struct lec_state *state, loff_t *l) +{ + struct net_device *dev; + void *v; + + dev = state->dev ? state->dev : dev_lec[state->itf]; + v = (dev && dev->priv) ? lec_priv_walk(state, l, dev->priv) : NULL; + if (!v && dev) { + dev_put(dev); + /* Partial state reset for the next time we get called */ + dev = NULL; + } + state->dev = dev; + return v; +} + +static void *lec_get_idx(struct lec_state *state, loff_t l) +{ + void *v = NULL; + + for (; state->itf < MAX_LEC_ITF; state->itf++) { + v = lec_itf_walk(state, &l); + if (v) + break; + } |