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mpc.c
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mpc.c
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#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/capability.h>
#include <linux/seq_file.h>
/* We are an 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/checksum.h> /* for ip_fast_csum() */
#include <net/arp.h>
#include <net/dst.h>
#include <linux/proc_fs.h>
/* And atm device */
#include <linux/atmdev.h>
#include <linux/atmlec.h>
#include <linux/atmmpc.h>
/* Modular too */
#include <linux/module.h>
#include "lec.h"
#include "mpc.h"
#include "resources.h"
/*
* mpc.c: Implementation of MPOA client kernel part
*/
#if 0
#define dprintk printk /* debug */
#else
#define dprintk(format,args...)
#endif
#if 0
#define ddprintk printk /* more debug */
#else
#define ddprintk(format,args...)
#endif
#define MPOA_TAG_LEN 4
/* mpc_daemon -> kernel */
static void MPOA_trigger_rcvd (struct k_message *msg, struct mpoa_client *mpc);
static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action);
static void MPOA_cache_impos_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
static void set_mps_mac_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type);
static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc);
static void mpoad_close(struct atm_vcc *vcc);
static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev);
static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
static void mpc_timer_refresh(void);
static void mpc_cache_check( unsigned long checking_time );
static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
0xaa, 0xaa, 0x03,
{0x00, 0x00, 0x5e},
{0x00, 0x03} /* For MPOA control PDUs */
};
static struct llc_snap_hdr llc_snap_mpoa_data = {
0xaa, 0xaa, 0x03,
{0x00, 0x00, 0x00},
{0x08, 0x00} /* This is for IP PDUs only */
};
static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
0xaa, 0xaa, 0x03,
{0x00, 0x00, 0x00},
{0x88, 0x4c} /* This is for tagged data PDUs */
};
static struct notifier_block mpoa_notifier = {
mpoa_event_listener,
NULL,
0
};
struct mpoa_client *mpcs = NULL; /* FIXME */
static struct atm_mpoa_qos *qos_head = NULL;
static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
static struct mpoa_client *find_mpc_by_itfnum(int itf)
{
struct mpoa_client *mpc;
mpc = mpcs; /* our global linked list */
while (mpc != NULL) {
if (mpc->dev_num == itf)
return mpc;
mpc = mpc->next;
}
return NULL; /* not found */
}
static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
{
struct mpoa_client *mpc;
mpc = mpcs; /* our global linked list */
while (mpc != NULL) {
if (mpc->mpoad_vcc == vcc)
return mpc;
mpc = mpc->next;
}
return NULL; /* not found */
}
static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
{
struct mpoa_client *mpc;
mpc = mpcs; /* our global linked list */
while (mpc != NULL) {
if (mpc->dev == dev)
return mpc;
mpc = mpc->next;
}
return NULL; /* not found */
}
/*
* Functions for managing QoS list
*/
/*
* Overwrites the old entry or makes a new one.
*/
struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)
{
struct atm_mpoa_qos *entry;
entry = atm_mpoa_search_qos(dst_ip);
if (entry != NULL) {
entry->qos = *qos;
return entry;
}
entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
if (entry == NULL) {
printk("mpoa: atm_mpoa_add_qos: out of memory\n");
return entry;
}
entry->ipaddr = dst_ip;
entry->qos = *qos;
entry->next = qos_head;
qos_head = entry;
return entry;
}
struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)
{
struct atm_mpoa_qos *qos;
qos = qos_head;
while( qos != NULL ){
if(qos->ipaddr == dst_ip) {
break;
}
qos = qos->next;
}
return qos;
}
/*
* Returns 0 for failure
*/
int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
{
struct atm_mpoa_qos *curr;
if (entry == NULL) return 0;
if (entry == qos_head) {
qos_head = qos_head->next;
kfree(entry);
return 1;
}
curr = qos_head;
while (curr != NULL) {
if (curr->next == entry) {
curr->next = entry->next;
kfree(entry);
return 1;
}
curr = curr->next;
}
return 0;
}
/* this is buggered - we need locking for qos_head */
void atm_mpoa_disp_qos(struct seq_file *m)
{
struct atm_mpoa_qos *qos;
qos = qos_head;
seq_printf(m, "QoS entries for shortcuts:\n");
seq_printf(m, "IP address\n TX:max_pcr pcr min_pcr max_cdv max_sdu\n RX:max_pcr pcr min_pcr max_cdv max_sdu\n");
while (qos != NULL) {
seq_printf(m, "%u.%u.%u.%u\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
NIPQUAD(qos->ipaddr),
qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
qos = qos->next;
}
}
static struct net_device *find_lec_by_itfnum(int itf)
{
struct net_device *dev;
char name[IFNAMSIZ];
sprintf(name, "lec%d", itf);
dev = dev_get_by_name(name);
return dev;
}
static struct mpoa_client *alloc_mpc(void)
{
struct mpoa_client *mpc;
mpc = kzalloc(sizeof (struct mpoa_client), GFP_KERNEL);
if (mpc == NULL)
return NULL;
rwlock_init(&mpc->ingress_lock);
rwlock_init(&mpc->egress_lock);
mpc->next = mpcs;
atm_mpoa_init_cache(mpc);
mpc->parameters.mpc_p1 = MPC_P1;
mpc->parameters.mpc_p2 = MPC_P2;
memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
mpc->parameters.mpc_p4 = MPC_P4;
mpc->parameters.mpc_p5 = MPC_P5;
mpc->parameters.mpc_p6 = MPC_P6;
mpcs = mpc;
return mpc;
}
/*
*
* start_mpc() puts the MPC on line. All the packets destined
* to the lec underneath us are now being monitored and
* shortcuts will be established.
*
*/
static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
{
dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
if (dev->hard_start_xmit == NULL) {
printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
dev->name);
return;
}
mpc->old_hard_start_xmit = dev->hard_start_xmit;
dev->hard_start_xmit = mpc_send_packet;
return;
}
static void stop_mpc(struct mpoa_client *mpc)
{
dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
/* Lets not nullify lec device's dev->hard_start_xmit */
if (mpc->dev->hard_start_xmit != mpc_send_packet) {
dprintk(" mpc already stopped, not fatal\n");
return;
}
dprintk("\n");
mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
mpc->old_hard_start_xmit = NULL;
/* close_shortcuts(mpc); ??? FIXME */
return;
}
static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
static const char *mpoa_device_type_string(char type)
{
switch(type) {
case NON_MPOA:
return "non-MPOA device";
break;
case MPS:
return "MPS";
break;
case MPC:
return "MPC";
break;
case MPS_AND_MPC:
return "both MPS and MPC";
break;
default:
return "unspecified (non-MPOA) device";
break;
}
return ""; /* not reached */
}
/*
* lec device calls this via its dev->priv->lane2_ops->associate_indicator()
* when it sees a TLV in LE_ARP packet.
* We fill in the pointer above when we see a LANE2 lec initializing
* See LANE2 spec 3.1.5
*
* Quite a big and ugly function but when you look at it
* all it does is to try to locate and parse MPOA Device
* Type TLV.
* We give our lec a pointer to this function and when the
* lec sees a TLV it uses the pointer to call this function.
*
*/
static void lane2_assoc_ind(struct net_device *dev, uint8_t *mac_addr,
uint8_t *tlvs, uint32_t sizeoftlvs)
{
uint32_t type;
uint8_t length, mpoa_device_type, number_of_mps_macs;
uint8_t *end_of_tlvs;
struct mpoa_client *mpc;
mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
dprintk("total length of all TLVs %d\n", sizeoftlvs);
mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
if (mpc == NULL) {
printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
return;
}
end_of_tlvs = tlvs + sizeoftlvs;
while (end_of_tlvs - tlvs >= 5) {
type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
length = tlvs[4];
tlvs += 5;
dprintk(" type 0x%x length %02x\n", type, length);
if (tlvs + length > end_of_tlvs) {
printk("TLV value extends past its buffer, aborting parse\n");
return;
}
if (type == 0) {
printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
return;
}
if (type != TLV_MPOA_DEVICE_TYPE) {
tlvs += length;
continue; /* skip other TLVs */
}
mpoa_device_type = *tlvs++;
number_of_mps_macs = *tlvs++;
dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
if (mpoa_device_type == MPS_AND_MPC &&
length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
dev->name);
continue;
}
if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
&& length < 22 + number_of_mps_macs*ETH_ALEN) {
printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
dev->name);
continue;
}
if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
dprintk("ignoring non-MPS device\n");
if (mpoa_device_type == MPC) tlvs += 20;
continue; /* we are only interested in MPSs */
}
if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
continue; /* someone should read the spec */
}
dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
/* ok, now we can go and tell our daemon the control address of MPS */
send_set_mps_ctrl_addr(tlvs, mpc);
tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
if (tlvs == NULL) return;
}
if (end_of_tlvs - tlvs != 0)
printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
dev->name, end_of_tlvs - tlvs);
return;
}
/*
* Store at least advertizing router's MAC address
* plus the possible MAC address(es) to mpc->mps_macs.
* For a freshly allocated MPOA client mpc->mps_macs == 0.
*/
static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type)
{
int num_macs;
num_macs = (mps_macs > 1) ? mps_macs : 1;
if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
mpc->number_of_mps_macs = 0;
mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
if (mpc->mps_macs == NULL) {
printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
return NULL;
}
}
memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
if (mps_macs > 0)
memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
tlvs += mps_macs*ETH_ALEN;
mpc->number_of_mps_macs = num_macs;
return tlvs;
}
static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
{
in_cache_entry *entry;
struct iphdr *iph;
char *buff;
__be32 ipaddr = 0;
static struct {
struct llc_snap_hdr hdr;
__be32 tag;
} tagged_llc_snap_hdr = {
{0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
0
};
buff = skb->data + mpc->dev->hard_header_len;
iph = (struct iphdr *)buff;
ipaddr = iph->daddr;
ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
entry = mpc->in_ops->get(ipaddr, mpc);
if (entry == NULL) {
entry = mpc->in_ops->add_entry(ipaddr, mpc);
if (entry != NULL) mpc->in_ops->put(entry);
return 1;
}
if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
mpc->in_ops->put(entry);
return 1;
}
ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
/* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
if (iph->ttl <= 1) {
ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
mpc->in_ops->put(entry);
return 1;
}
iph->ttl--;
iph->check = 0;
iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
if (entry->ctrl_info.tag != 0) {
ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
sizeof(tagged_llc_snap_hdr));
} else {
skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
sizeof(struct llc_snap_hdr));
}
atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
entry->shortcut->send(entry->shortcut, skb);
entry->packets_fwded++;
mpc->in_ops->put(entry);
return 0;
}
/*
* Probably needs some error checks and locking, not sure...
*/
static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev)
{
int retval;
struct mpoa_client *mpc;
struct ethhdr *eth;
int i = 0;
mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
if(mpc == NULL) {
printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
goto non_ip;
}
eth = (struct ethhdr *)skb->data;
if (eth->h_proto != htons(ETH_P_IP))
goto non_ip; /* Multi-Protocol Over ATM :-) */
while (i < mpc->number_of_mps_macs) {
if (!compare_ether_addr(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN)))
if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
return 0; /* success! */
i++;
}
non_ip:
retval = mpc->old_hard_start_xmit(skb,dev);
return retval;
}
static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
{
int bytes_left;
struct mpoa_client *mpc;
struct atmmpc_ioc ioc_data;
in_cache_entry *in_entry;
__be32 ipaddr;
bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
if (bytes_left != 0) {
printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
return -EFAULT;
}
ipaddr = ioc_data.ipaddr;
if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
return -EINVAL;
mpc = find_mpc_by_itfnum(ioc_data.dev_num);
if (mpc == NULL)
return -EINVAL;
if (ioc_data.type == MPC_SOCKET_INGRESS) {
in_entry = mpc->in_ops->get(ipaddr, mpc);
if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
mpc->dev->name);
if (in_entry != NULL) mpc->in_ops->put(in_entry);
return -EINVAL;
}
printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u\n",
mpc->dev->name, NIPQUAD(in_entry->ctrl_info.in_dst_ip));
in_entry->shortcut = vcc;
mpc->in_ops->put(in_entry);
} else {
printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
}
vcc->proto_data = mpc->dev;
vcc->push = mpc_push;
return 0;
}
/*
*
*/
static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
{
struct mpoa_client *mpc;
in_cache_entry *in_entry;
eg_cache_entry *eg_entry;
mpc = find_mpc_by_lec(dev);
if (mpc == NULL) {
printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
return;
}
dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
if (in_entry) {
dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u\n",
mpc->dev->name, NIPQUAD(in_entry->ctrl_info.in_dst_ip));
in_entry->shortcut = NULL;
mpc->in_ops->put(in_entry);
}
eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
if (eg_entry) {
dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name);
eg_entry->shortcut = NULL;
mpc->eg_ops->put(eg_entry);
}
if (in_entry == NULL && eg_entry == NULL)
dprintk("mpoa: (%s) mpc_vcc_close: unused vcc closed\n", dev->name);
return;
}
static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
{
struct net_device *dev = (struct net_device *)vcc->proto_data;
struct sk_buff *new_skb;
eg_cache_entry *eg;
struct mpoa_client *mpc;
__be32 tag;
char *tmp;
ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
if (skb == NULL) {
dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name);
mpc_vcc_close(vcc, dev);
return;
}
skb->dev = dev;
if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
struct sock *sk = sk_atm(vcc);
dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name);
/* Pass control packets to daemon */
skb_queue_tail(&sk->sk_receive_queue, skb);
sk->sk_data_ready(sk, skb->len);
return;
}
/* data coming over the shortcut */
atm_return(vcc, skb->truesize);
mpc = find_mpc_by_lec(dev);
if (mpc == NULL) {
printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name);
return;
}
if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name);
} else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name);
printk(" mpc_push: non-tagged data unsupported, purging\n");
dev_kfree_skb_any(skb);
return;
} else {
printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
dev_kfree_skb_any(skb);
return;
}
tmp = skb->data + sizeof(struct llc_snap_hdr);
tag = *(__be32 *)tmp;
eg = mpc->eg_ops->get_by_tag(tag, mpc);
if (eg == NULL) {
printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n",
dev->name,tag);
purge_egress_shortcut(vcc, NULL);
dev_kfree_skb_any(skb);
return;
}
/*
* See if ingress MPC is using shortcut we opened as a return channel.
* This means we have a bi-directional vcc opened by us.
*/
if (eg->shortcut == NULL) {
eg->shortcut = vcc;
printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name);
}
skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
dev_kfree_skb_any(skb);
if (new_skb == NULL){
mpc->eg_ops->put(eg);
return;
}
skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
eg->ctrl_info.DH_length);
new_skb->protocol = eth_type_trans(new_skb, dev);
skb_reset_network_header(new_skb);
eg->latest_ip_addr = ip_hdr(new_skb)->saddr;
eg->packets_rcvd++;
mpc->eg_ops->put(eg);
memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
netif_rx(new_skb);
return;
}
static struct atmdev_ops mpc_ops = { /* only send is required */
.close = mpoad_close,
.send = msg_from_mpoad
};
static struct atm_dev mpc_dev = {
.ops = &mpc_ops,
.type = "mpc",
.number = 42,
.lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock)
/* members not explicitly initialised will be 0 */
};
static int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
{
struct mpoa_client *mpc;
struct lec_priv *priv;
int err;
if (mpcs == NULL) {
init_timer(&mpc_timer);
mpc_timer_refresh();
/* This lets us now how our LECs are doing */
err = register_netdevice_notifier(&mpoa_notifier);
if (err < 0) {
del_timer(&mpc_timer);
return err;
}
}
mpc = find_mpc_by_itfnum(arg);
if (mpc == NULL) {
dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg);
mpc = alloc_mpc();
if (mpc == NULL)
return -ENOMEM;
mpc->dev_num = arg;
mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
}
if (mpc->mpoad_vcc) {
printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg);
return -EADDRINUSE;
}
if (mpc->dev) { /* check if the lec is LANE2 capable */
priv = (struct lec_priv *)mpc->dev->priv;
if (priv->lane_version < 2) {
dev_put(mpc->dev);
mpc->dev = NULL;
} else
priv->lane2_ops->associate_indicator = lane2_assoc_ind;
}
mpc->mpoad_vcc = vcc;
vcc->dev = &mpc_dev;
vcc_insert_socket(sk_atm(vcc));
set_bit(ATM_VF_META,&vcc->flags);
set_bit(ATM_VF_READY,&vcc->flags);
if (mpc->dev) {
char empty[ATM_ESA_LEN];
memset(empty, 0, ATM_ESA_LEN);
start_mpc(mpc, mpc->dev);
/* set address if mpcd e.g. gets killed and restarted.
* If we do not do it now we have to wait for the next LE_ARP
*/
if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
}
__module_get(THIS_MODULE);
return arg;
}
static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc)
{
struct k_message mesg;
memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
mesg.type = SET_MPS_CTRL_ADDR;
memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
msg_to_mpoad(&mesg, mpc);
return;
}
static void mpoad_close(struct atm_vcc *vcc)
{
struct mpoa_client *mpc;
struct sk_buff *skb;
mpc = find_mpc_by_vcc(vcc);
if (mpc == NULL) {
printk("mpoa: mpoad_close: did not find MPC\n");
return;
}
if (!mpc->mpoad_vcc) {
printk("mpoa: mpoad_close: close for non-present mpoad\n");
return;
}
mpc->mpoad_vcc = NULL;
if (mpc->dev) {
struct lec_priv *priv = (struct lec_priv *)mpc->dev->priv;
priv->lane2_ops->associate_indicator = NULL;
stop_mpc(mpc);
dev_put(mpc->dev);
}
mpc->in_ops->destroy_cache(mpc);
mpc->eg_ops->destroy_cache(mpc);
while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
atm_return(vcc, skb->truesize);
kfree_skb(skb);
}
printk("mpoa: (%s) going down\n",
(mpc->dev) ? mpc->dev->name : "<unknown>");
module_put(THIS_MODULE);
return;
}
/*
*
*/
static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
{
struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
struct k_message *mesg = (struct k_message*)skb->data;
atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
if (mpc == NULL) {
printk("mpoa: msg_from_mpoad: no mpc found\n");
return 0;
}
dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
switch(mesg->type) {
case MPOA_RES_REPLY_RCVD:
dprintk(" mpoa_res_reply_rcvd\n");
MPOA_res_reply_rcvd(mesg, mpc);
break;
case MPOA_TRIGGER_RCVD:
dprintk(" mpoa_trigger_rcvd\n");
MPOA_trigger_rcvd(mesg, mpc);
break;
case INGRESS_PURGE_RCVD:
dprintk(" nhrp_purge_rcvd\n");
ingress_purge_rcvd(mesg, mpc);
break;
case EGRESS_PURGE_RCVD:
dprintk(" egress_purge_reply_rcvd\n");
egress_purge_rcvd(mesg, mpc);
break;
case MPS_DEATH:
dprintk(" mps_death\n");
mps_death(mesg, mpc);
break;
case CACHE_IMPOS_RCVD:
dprintk(" cache_impos_rcvd\n");
MPOA_cache_impos_rcvd(mesg, mpc);
break;
case SET_MPC_CTRL_ADDR:
dprintk(" set_mpc_ctrl_addr\n");
set_mpc_ctrl_addr_rcvd(mesg, mpc);
break;
case SET_MPS_MAC_ADDR:
dprintk(" set_mps_mac_addr\n");
set_mps_mac_addr_rcvd(mesg, mpc);
break;
case CLEAN_UP_AND_EXIT:
dprintk(" clean_up_and_exit\n");
clean_up(mesg, mpc, DIE);
break;
case RELOAD:
dprintk(" reload\n");
clean_up(mesg, mpc, RELOAD);
break;
case SET_MPC_PARAMS:
dprintk(" set_mpc_params\n");
mpc->parameters = mesg->content.params;
break;
default:
dprintk(" unknown message %d\n", mesg->type);
break;
}
kfree_skb(skb);
return 0;
}
/* Remember that this function may not do things that sleep */
int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
{
struct sk_buff *skb;
struct sock *sk;
if (mpc == NULL || !mpc->mpoad_vcc) {
printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
return -ENXIO;
}
skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
skb_put(skb, sizeof(struct k_message));
skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
atm_force_charge(mpc->mpoad_vcc, skb->truesize);
sk = sk_atm(mpc->mpoad_vcc);
skb_queue_tail(&sk->sk_receive_queue, skb);
sk->sk_data_ready(sk, skb->len);
return 0;
}
static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
{
struct net_device *dev;
struct mpoa_client *mpc;
struct lec_priv *priv;
dev = (struct net_device *)dev_ptr;
if (dev->name == NULL || strncmp(dev->name, "lec", 3))
return NOTIFY_DONE; /* we are only interested in lec:s */
switch (event) {
case NETDEV_REGISTER: /* a new lec device was allocated */
priv = (struct lec_priv *)dev->priv;
if (priv->lane_version < 2)
break;
priv->lane2_ops->associate_indicator = lane2_assoc_ind;
mpc = find_mpc_by_itfnum(priv->itfnum);
if (mpc == NULL) {
dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
dev->name);
mpc = alloc_mpc();
if (mpc == NULL) {
printk("mpoa: mpoa_event_listener: no new mpc");
break;
}
}
mpc->dev_num = priv->itfnum;
mpc->dev = dev;
dev_hold(dev);
dprintk("mpoa: (%s) was initialized\n", dev->name);
break;
case NETDEV_UNREGISTER:
/* the lec device was deallocated */
mpc = find_mpc_by_lec(dev);
if (mpc == NULL)
break;
dprintk("mpoa: device (%s) was deallocated\n", dev->name);
stop_mpc(mpc);
dev_put(mpc->dev);
mpc->dev = NULL;
break;
case NETDEV_UP:
/* the dev was ifconfig'ed up */
mpc = find_mpc_by_lec(dev);
if (mpc == NULL)
break;
if (mpc->mpoad_vcc != NULL) {
start_mpc(mpc, dev);
}