1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
21da177e4SLinus Torvalds /* net/atm/addr.c - Local ATM address registry */
31da177e4SLinus Torvalds
41da177e4SLinus Torvalds /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
51da177e4SLinus Torvalds
61da177e4SLinus Torvalds #include <linux/atm.h>
71da177e4SLinus Torvalds #include <linux/atmdev.h>
85a0e3ad6STejun Heo #include <linux/slab.h>
9c39f01d7SJoe Perches #include <linux/uaccess.h>
101da177e4SLinus Torvalds
111da177e4SLinus Torvalds #include "signaling.h"
121da177e4SLinus Torvalds #include "addr.h"
131da177e4SLinus Torvalds
check_addr(const struct sockaddr_atmsvc * addr)1461c33e01SMitchell Blank Jr static int check_addr(const struct sockaddr_atmsvc *addr)
151da177e4SLinus Torvalds {
161da177e4SLinus Torvalds int i;
171da177e4SLinus Torvalds
181da177e4SLinus Torvalds if (addr->sas_family != AF_ATMSVC)
191da177e4SLinus Torvalds return -EAFNOSUPPORT;
201da177e4SLinus Torvalds if (!*addr->sas_addr.pub)
211da177e4SLinus Torvalds return *addr->sas_addr.prv ? 0 : -EINVAL;
221da177e4SLinus Torvalds for (i = 1; i < ATM_E164_LEN + 1; i++) /* make sure it's \0-terminated */
231da177e4SLinus Torvalds if (!addr->sas_addr.pub[i])
241da177e4SLinus Torvalds return 0;
251da177e4SLinus Torvalds return -EINVAL;
261da177e4SLinus Torvalds }
271da177e4SLinus Torvalds
identical(const struct sockaddr_atmsvc * a,const struct sockaddr_atmsvc * b)2861c33e01SMitchell Blank Jr static int identical(const struct sockaddr_atmsvc *a, const struct sockaddr_atmsvc *b)
291da177e4SLinus Torvalds {
301da177e4SLinus Torvalds if (*a->sas_addr.prv)
311da177e4SLinus Torvalds if (memcmp(a->sas_addr.prv, b->sas_addr.prv, ATM_ESA_LEN))
321da177e4SLinus Torvalds return 0;
331da177e4SLinus Torvalds if (!*a->sas_addr.pub)
341da177e4SLinus Torvalds return !*b->sas_addr.pub;
351da177e4SLinus Torvalds if (!*b->sas_addr.pub)
361da177e4SLinus Torvalds return 0;
371da177e4SLinus Torvalds return !strcmp(a->sas_addr.pub, b->sas_addr.pub);
381da177e4SLinus Torvalds }
391da177e4SLinus Torvalds
notify_sigd(const struct atm_dev * dev)4061c33e01SMitchell Blank Jr static void notify_sigd(const struct atm_dev *dev)
411da177e4SLinus Torvalds {
421da177e4SLinus Torvalds struct sockaddr_atmpvc pvc;
431da177e4SLinus Torvalds
441da177e4SLinus Torvalds pvc.sap_addr.itf = dev->number;
451da177e4SLinus Torvalds sigd_enq(NULL, as_itf_notify, NULL, &pvc, NULL);
461da177e4SLinus Torvalds }
471da177e4SLinus Torvalds
atm_reset_addr(struct atm_dev * dev,enum atm_addr_type_t atype)480f21ba7cSEric Kinzie void atm_reset_addr(struct atm_dev *dev, enum atm_addr_type_t atype)
491da177e4SLinus Torvalds {
501da177e4SLinus Torvalds unsigned long flags;
511da177e4SLinus Torvalds struct atm_dev_addr *this, *p;
520f21ba7cSEric Kinzie struct list_head *head;
531da177e4SLinus Torvalds
541da177e4SLinus Torvalds spin_lock_irqsave(&dev->lock, flags);
550f21ba7cSEric Kinzie if (atype == ATM_ADDR_LECS)
560f21ba7cSEric Kinzie head = &dev->lecs;
570f21ba7cSEric Kinzie else
580f21ba7cSEric Kinzie head = &dev->local;
590f21ba7cSEric Kinzie list_for_each_entry_safe(this, p, head, entry) {
60735631a9SMartin Whitaker list_del(&this->entry);
611da177e4SLinus Torvalds kfree(this);
62735631a9SMartin Whitaker }
631da177e4SLinus Torvalds spin_unlock_irqrestore(&dev->lock, flags);
640f21ba7cSEric Kinzie if (head == &dev->local)
651da177e4SLinus Torvalds notify_sigd(dev);
661da177e4SLinus Torvalds }
671da177e4SLinus Torvalds
atm_add_addr(struct atm_dev * dev,const struct sockaddr_atmsvc * addr,enum atm_addr_type_t atype)6861c33e01SMitchell Blank Jr int atm_add_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
690f21ba7cSEric Kinzie enum atm_addr_type_t atype)
701da177e4SLinus Torvalds {
711da177e4SLinus Torvalds unsigned long flags;
721da177e4SLinus Torvalds struct atm_dev_addr *this;
730f21ba7cSEric Kinzie struct list_head *head;
741da177e4SLinus Torvalds int error;
751da177e4SLinus Torvalds
761da177e4SLinus Torvalds error = check_addr(addr);
771da177e4SLinus Torvalds if (error)
781da177e4SLinus Torvalds return error;
791da177e4SLinus Torvalds spin_lock_irqsave(&dev->lock, flags);
800f21ba7cSEric Kinzie if (atype == ATM_ADDR_LECS)
810f21ba7cSEric Kinzie head = &dev->lecs;
820f21ba7cSEric Kinzie else
830f21ba7cSEric Kinzie head = &dev->local;
840f21ba7cSEric Kinzie list_for_each_entry(this, head, entry) {
851da177e4SLinus Torvalds if (identical(&this->addr, addr)) {
861da177e4SLinus Torvalds spin_unlock_irqrestore(&dev->lock, flags);
871da177e4SLinus Torvalds return -EEXIST;
881da177e4SLinus Torvalds }
891da177e4SLinus Torvalds }
901da177e4SLinus Torvalds this = kmalloc(sizeof(struct atm_dev_addr), GFP_ATOMIC);
911da177e4SLinus Torvalds if (!this) {
921da177e4SLinus Torvalds spin_unlock_irqrestore(&dev->lock, flags);
931da177e4SLinus Torvalds return -ENOMEM;
941da177e4SLinus Torvalds }
951da177e4SLinus Torvalds this->addr = *addr;
960f21ba7cSEric Kinzie list_add(&this->entry, head);
971da177e4SLinus Torvalds spin_unlock_irqrestore(&dev->lock, flags);
980f21ba7cSEric Kinzie if (head == &dev->local)
991da177e4SLinus Torvalds notify_sigd(dev);
1001da177e4SLinus Torvalds return 0;
1011da177e4SLinus Torvalds }
1021da177e4SLinus Torvalds
atm_del_addr(struct atm_dev * dev,const struct sockaddr_atmsvc * addr,enum atm_addr_type_t atype)10361c33e01SMitchell Blank Jr int atm_del_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
1040f21ba7cSEric Kinzie enum atm_addr_type_t atype)
1051da177e4SLinus Torvalds {
1061da177e4SLinus Torvalds unsigned long flags;
1071da177e4SLinus Torvalds struct atm_dev_addr *this;
1080f21ba7cSEric Kinzie struct list_head *head;
1091da177e4SLinus Torvalds int error;
1101da177e4SLinus Torvalds
1111da177e4SLinus Torvalds error = check_addr(addr);
1121da177e4SLinus Torvalds if (error)
1131da177e4SLinus Torvalds return error;
1141da177e4SLinus Torvalds spin_lock_irqsave(&dev->lock, flags);
1150f21ba7cSEric Kinzie if (atype == ATM_ADDR_LECS)
1160f21ba7cSEric Kinzie head = &dev->lecs;
1170f21ba7cSEric Kinzie else
1180f21ba7cSEric Kinzie head = &dev->local;
1190f21ba7cSEric Kinzie list_for_each_entry(this, head, entry) {
1201da177e4SLinus Torvalds if (identical(&this->addr, addr)) {
1211da177e4SLinus Torvalds list_del(&this->entry);
1221da177e4SLinus Torvalds spin_unlock_irqrestore(&dev->lock, flags);
1231da177e4SLinus Torvalds kfree(this);
1240f21ba7cSEric Kinzie if (head == &dev->local)
1251da177e4SLinus Torvalds notify_sigd(dev);
1261da177e4SLinus Torvalds return 0;
1271da177e4SLinus Torvalds }
1281da177e4SLinus Torvalds }
1291da177e4SLinus Torvalds spin_unlock_irqrestore(&dev->lock, flags);
1301da177e4SLinus Torvalds return -ENOENT;
1311da177e4SLinus Torvalds }
1321da177e4SLinus Torvalds
atm_get_addr(struct atm_dev * dev,struct sockaddr_atmsvc __user * buf,size_t size,enum atm_addr_type_t atype)1331da177e4SLinus Torvalds int atm_get_addr(struct atm_dev *dev, struct sockaddr_atmsvc __user * buf,
1340f21ba7cSEric Kinzie size_t size, enum atm_addr_type_t atype)
1351da177e4SLinus Torvalds {
1361da177e4SLinus Torvalds unsigned long flags;
1371da177e4SLinus Torvalds struct atm_dev_addr *this;
1380f21ba7cSEric Kinzie struct list_head *head;
1391da177e4SLinus Torvalds int total = 0, error;
1401da177e4SLinus Torvalds struct sockaddr_atmsvc *tmp_buf, *tmp_bufp;
1411da177e4SLinus Torvalds
1421da177e4SLinus Torvalds spin_lock_irqsave(&dev->lock, flags);
1430f21ba7cSEric Kinzie if (atype == ATM_ADDR_LECS)
1440f21ba7cSEric Kinzie head = &dev->lecs;
1450f21ba7cSEric Kinzie else
1460f21ba7cSEric Kinzie head = &dev->local;
1470f21ba7cSEric Kinzie list_for_each_entry(this, head, entry)
1481da177e4SLinus Torvalds total += sizeof(struct sockaddr_atmsvc);
1491da177e4SLinus Torvalds tmp_buf = tmp_bufp = kmalloc(total, GFP_ATOMIC);
1501da177e4SLinus Torvalds if (!tmp_buf) {
1511da177e4SLinus Torvalds spin_unlock_irqrestore(&dev->lock, flags);
1521da177e4SLinus Torvalds return -ENOMEM;
1531da177e4SLinus Torvalds }
1540f21ba7cSEric Kinzie list_for_each_entry(this, head, entry)
1551da177e4SLinus Torvalds memcpy(tmp_bufp++, &this->addr, sizeof(struct sockaddr_atmsvc));
1561da177e4SLinus Torvalds spin_unlock_irqrestore(&dev->lock, flags);
1571da177e4SLinus Torvalds error = total > size ? -E2BIG : total;
1581da177e4SLinus Torvalds if (copy_to_user(buf, tmp_buf, total < size ? total : size))
1591da177e4SLinus Torvalds error = -EFAULT;
1601da177e4SLinus Torvalds kfree(tmp_buf);
1611da177e4SLinus Torvalds return error;
1621da177e4SLinus Torvalds }
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