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/* net/atm/addr.c - Local ATM address registry */

/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */

#include <linux/atm.h>

#include <linux/atmdev.h>

#include <linux/sched.h>

#include <asm/uaccess.h>

#include "signaling.h"

#include "addr.h"

static int check_addr(struct sockaddr_atmsvc *addr)

{

        int i;

        if (addr->sas_family != AF_ATMSVC) return -EAFNOSUPPORT;

        if (!*addr->sas_addr.pub)

                return *addr->sas_addr.prv ? 0 : -EINVAL;

        for (i = 1; i < ATM_E164_LEN+1; i++) /* make sure it's \0-terminated */

                if (!addr->sas_addr.pub[i]) return 0;

        return -EINVAL;

}

static int identical(struct sockaddr_atmsvc *a,struct sockaddr_atmsvc *b)

{

        if (*a->sas_addr.prv)

                if (memcmp(a->sas_addr.prv,b->sas_addr.prv,ATM_ESA_LEN))

                        return 0;

        if (!*a->sas_addr.pub) return !*b->sas_addr.pub;

        if (!*b->sas_addr.pub) return 0;

        return !strcmp(a->sas_addr.pub,b->sas_addr.pub);

}

static void notify_sigd(struct atm_dev *dev)

{

        struct sockaddr_atmpvc pvc;

        pvc.sap_addr.itf = dev->number;

        sigd_enq(NULL,as_itf_notify,NULL,&pvc,NULL);

}

void atm_reset_addr(struct atm_dev *dev)

{

        unsigned long flags;

        struct atm_dev_addr *this;

        spin_lock_irqsave(&dev->lock, flags);

        while (dev->local) {

                this = dev->local;

                dev->local = this->next;

                kfree(this);

        }

        spin_unlock_irqrestore(&dev->lock, flags);

        notify_sigd(dev);

}

int atm_add_addr(struct atm_dev *dev,struct sockaddr_atmsvc *addr)

{

        unsigned long flags;

        struct atm_dev_addr **walk;

        int error;

        error = check_addr(addr);

        if (error)

                return error;

        spin_lock_irqsave(&dev->lock, flags);

        for (walk = &dev->local; *walk; walk = &(*walk)->next)

                if (identical(&(*walk)->addr,addr)) {

                        spin_unlock_irqrestore(&dev->lock, flags);

                        return -EEXIST;

                }

        *walk = kmalloc(sizeof(struct atm_dev_addr), GFP_ATOMIC);

        if (!*walk) {

                spin_unlock_irqrestore(&dev->lock, flags);

                return -ENOMEM;

        }

        (*walk)->addr = *addr;

        (*walk)->next = NULL;

        spin_unlock_irqrestore(&dev->lock, flags);

        notify_sigd(dev);

        return 0;

}

int atm_del_addr(struct atm_dev *dev,struct sockaddr_atmsvc *addr)

{

        unsigned long flags;

        struct atm_dev_addr **walk,*this;

        int error;

        error = check_addr(addr);

        if (error)

                return error;

        spin_lock_irqsave(&dev->lock, flags);

        for (walk = &dev->local; *walk; walk = &(*walk)->next)

                if (identical(&(*walk)->addr,addr)) break;

        if (!*walk) {

                spin_unlock_irqrestore(&dev->lock, flags);

                return -ENOENT;

        }

        this = *walk;

        *walk = this->next;

        kfree(this);

        spin_unlock_irqrestore(&dev->lock, flags);

        notify_sigd(dev);

        return 0;

}

int atm_get_addr(struct atm_dev *dev,struct sockaddr_atmsvc *u_buf,int size)

{

        unsigned long flags;

        struct atm_dev_addr *walk;

        int total = 0, error;

        struct sockaddr_atmsvc *tmp_buf, *tmp_bufp;

        spin_lock_irqsave(&dev->lock, flags);

        for (walk = dev->local; walk; walk = walk->next)

                total += sizeof(struct sockaddr_atmsvc);

        tmp_buf = tmp_bufp = kmalloc(total, GFP_ATOMIC);

        if (!tmp_buf) {

                spin_unlock_irqrestore(&dev->lock, flags);

                return -ENOMEM;

        }

        for (walk = dev->local; walk; walk = walk->next)

                memcpy(tmp_bufp++, &walk->addr, sizeof(struct sockaddr_atmsvc));

        spin_unlock_irqrestore(&dev->lock, flags);

        error = total > size ? -E2BIG : total;

        if (copy_to_user(u_buf, tmp_buf, total < size ? total : size))

                error = -EFAULT;

        kfree(tmp_buf);

        return error;

}