diff options
Diffstat (limited to 'net/atm')
| -rw-r--r-- | net/atm/Kconfig | 37 | ||||
| -rw-r--r-- | net/atm/Makefile | 12 | ||||
| -rw-r--r-- | net/atm/atm_misc.c | 23 | ||||
| -rw-r--r-- | net/atm/atm_sysfs.c | 158 | ||||
| -rw-r--r-- | net/atm/br2684.c | 871 | ||||
| -rw-r--r-- | net/atm/common.c | 857 | ||||
| -rw-r--r-- | net/atm/common.h | 51 | ||||
| -rw-r--r-- | net/atm/ioctl.c | 293 | ||||
| -rw-r--r-- | net/atm/pppoatm.c | 490 | ||||
| -rw-r--r-- | net/atm/proc.c | 333 | ||||
| -rw-r--r-- | net/atm/protocols.h | 13 | ||||
| -rw-r--r-- | net/atm/pvc.c | 162 | ||||
| -rw-r--r-- | net/atm/raw.c | 75 | ||||
| -rw-r--r-- | net/atm/resources.c | 363 | ||||
| -rw-r--r-- | net/atm/resources.h | 49 |
15 files changed, 3787 insertions, 0 deletions
diff --git a/net/atm/Kconfig b/net/atm/Kconfig new file mode 100644 index 000000000..dfdc3a855 --- /dev/null +++ b/net/atm/Kconfig @@ -0,0 +1,37 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Asynchronous Transfer Mode (ATM) +# + +config ATM + tristate "Asynchronous Transfer Mode (ATM)" + help + ATM is a high-speed networking technology for Local Area Networks + and Wide Area Networks. It uses a fixed packet size and is + connection oriented, allowing for the negotiation of minimum + bandwidth requirements. + + In order to participate in an ATM network, your Linux box needs an + ATM networking card. If you have that, say Y here and to the driver + of your ATM card below. + + Note that you need a set of user-space programs to actually make use + of ATM. See the file <file:Documentation/networking/atm.rst> for + further details. + +config ATM_BR2684 + tristate "RFC1483/2684 Bridged protocols" + depends on ATM && INET + help + ATM PVCs can carry ethernet PDUs according to RFC2684 (formerly 1483) + This device will act like an ethernet from the kernels point of view, + with the traffic being carried by ATM PVCs (currently 1 PVC/device). + This is sometimes used over DSL lines. If in doubt, say N. + +config ATM_BR2684_IPFILTER + bool "Per-VC IP filter kludge" + depends on ATM_BR2684 + help + This is an experimental mechanism for users who need to terminate a + large number of IP-only vcc's. Do not enable this unless you are sure + you know what you are doing. diff --git a/net/atm/Makefile b/net/atm/Makefile new file mode 100644 index 000000000..0a14ea7d4 --- /dev/null +++ b/net/atm/Makefile @@ -0,0 +1,12 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the ATM Protocol Families. +# + +atm-y := pvc.o ioctl.o common.o atm_misc.o raw.o resources.o atm_sysfs.o + +obj-$(CONFIG_ATM) += atm.o +obj-$(CONFIG_ATM_BR2684) += br2684.o +atm-$(CONFIG_PROC_FS) += proc.o + +obj-$(CONFIG_PPPOATM) += pppoatm.o diff --git a/net/atm/atm_misc.c b/net/atm/atm_misc.c new file mode 100644 index 000000000..c9d7609da --- /dev/null +++ b/net/atm/atm_misc.c @@ -0,0 +1,23 @@ +// SPDX-License-Identifier: GPL-2.0 +/* net/atm/atm_misc.c - Various functions for use by ATM drivers */ + +/* Written 1995-2000 by Werner Almesberger, EPFL ICA */ + +#include <linux/module.h> +#include <linux/atm.h> +#include <linux/atmdev.h> +#include <linux/skbuff.h> +#include <linux/bitops.h> +#include <linux/errno.h> +#include <linux/atomic.h> + +int atm_charge(struct atm_vcc *vcc, int truesize) +{ + atm_force_charge(vcc, truesize); + if (atomic_read(&sk_atm(vcc)->sk_rmem_alloc) <= sk_atm(vcc)->sk_rcvbuf) + return 1; + atm_return(vcc, truesize); + atomic_inc(&vcc->stats->rx_drop); + return 0; +} +EXPORT_SYMBOL(atm_charge); diff --git a/net/atm/atm_sysfs.c b/net/atm/atm_sysfs.c new file mode 100644 index 000000000..0676a9c33 --- /dev/null +++ b/net/atm/atm_sysfs.c @@ -0,0 +1,158 @@ +// SPDX-License-Identifier: GPL-2.0 +/* ATM driver model support. */ + +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/kobject.h> +#include <linux/atmdev.h> +#include "common.h" +#include "resources.h" + +#define to_atm_dev(cldev) container_of(cldev, struct atm_dev, class_dev) + +static ssize_t type_show(struct device *cdev, + struct device_attribute *attr, char *buf) +{ + struct atm_dev *adev = to_atm_dev(cdev); + + return scnprintf(buf, PAGE_SIZE, "%s\n", adev->type); +} + +static ssize_t address_show(struct device *cdev, + struct device_attribute *attr, char *buf) +{ + struct atm_dev *adev = to_atm_dev(cdev); + + return scnprintf(buf, PAGE_SIZE, "%pM\n", adev->esi); +} + +static ssize_t atmindex_show(struct device *cdev, + struct device_attribute *attr, char *buf) +{ + struct atm_dev *adev = to_atm_dev(cdev); + + return scnprintf(buf, PAGE_SIZE, "%d\n", adev->number); +} + +static ssize_t carrier_show(struct device *cdev, + struct device_attribute *attr, char *buf) +{ + struct atm_dev *adev = to_atm_dev(cdev); + + return scnprintf(buf, PAGE_SIZE, "%d\n", + adev->signal == ATM_PHY_SIG_LOST ? 0 : 1); +} + +static ssize_t link_rate_show(struct device *cdev, + struct device_attribute *attr, char *buf) +{ + struct atm_dev *adev = to_atm_dev(cdev); + int link_rate; + + /* show the link rate, not the data rate */ + switch (adev->link_rate) { + case ATM_OC3_PCR: + link_rate = 155520000; + break; + case ATM_OC12_PCR: + link_rate = 622080000; + break; + case ATM_25_PCR: + link_rate = 25600000; + break; + default: + link_rate = adev->link_rate * 8 * 53; + } + return scnprintf(buf, PAGE_SIZE, "%d\n", link_rate); +} + +static DEVICE_ATTR_RO(address); +static DEVICE_ATTR_RO(atmindex); +static DEVICE_ATTR_RO(carrier); +static DEVICE_ATTR_RO(type); +static DEVICE_ATTR_RO(link_rate); + +static struct device_attribute *atm_attrs[] = { + &dev_attr_address, + &dev_attr_atmindex, + &dev_attr_carrier, + &dev_attr_type, + &dev_attr_link_rate, + NULL +}; + + +static int atm_uevent(const struct device *cdev, struct kobj_uevent_env *env) +{ + const struct atm_dev *adev; + + if (!cdev) + return -ENODEV; + + adev = to_atm_dev(cdev); + + if (add_uevent_var(env, "NAME=%s%d", adev->type, adev->number)) + return -ENOMEM; + + return 0; +} + +static void atm_release(struct device *cdev) +{ + struct atm_dev *adev = to_atm_dev(cdev); + + kfree(adev); +} + +static struct class atm_class = { + .name = "atm", + .dev_release = atm_release, + .dev_uevent = atm_uevent, +}; + +int atm_register_sysfs(struct atm_dev *adev, struct device *parent) +{ + struct device *cdev = &adev->class_dev; + int i, j, err; + + cdev->class = &atm_class; + cdev->parent = parent; + dev_set_drvdata(cdev, adev); + + dev_set_name(cdev, "%s%d", adev->type, adev->number); + err = device_register(cdev); + if (err < 0) + return err; + + for (i = 0; atm_attrs[i]; i++) { + err = device_create_file(cdev, atm_attrs[i]); + if (err) + goto err_out; + } + + return 0; + +err_out: + for (j = 0; j < i; j++) + device_remove_file(cdev, atm_attrs[j]); + device_del(cdev); + return err; +} + +void atm_unregister_sysfs(struct atm_dev *adev) +{ + struct device *cdev = &adev->class_dev; + + device_del(cdev); +} + +int __init atm_sysfs_init(void) +{ + return class_register(&atm_class); +} + +void __exit atm_sysfs_exit(void) +{ + class_unregister(&atm_class); +} diff --git a/net/atm/br2684.c b/net/atm/br2684.c new file mode 100644 index 000000000..05712c283 --- /dev/null +++ b/net/atm/br2684.c @@ -0,0 +1,871 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Ethernet netdevice using ATM AAL5 as underlying carrier + * (RFC1483 obsoleted by RFC2684) for Linux + * + * Authors: Marcell GAL, 2000, XDSL Ltd, Hungary + * Eric Kinzie, 2006-2007, US Naval Research Laboratory + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/netdevice.h> +#include <linux/skbuff.h> +#include <linux/etherdevice.h> +#include <linux/rtnetlink.h> +#include <linux/ip.h> +#include <linux/uaccess.h> +#include <linux/slab.h> +#include <net/arp.h> +#include <linux/atm.h> +#include <linux/atmdev.h> +#include <linux/capability.h> +#include <linux/seq_file.h> + +#include <linux/atmbr2684.h> + +#include "common.h" + +static void skb_debug(const struct sk_buff *skb) +{ +#ifdef SKB_DEBUG +#define NUM2PRINT 50 + print_hex_dump(KERN_DEBUG, "br2684: skb: ", DUMP_OFFSET, + 16, 1, skb->data, min(NUM2PRINT, skb->len), true); +#endif +} + +#define BR2684_ETHERTYPE_LEN 2 +#define BR2684_PAD_LEN 2 + +#define LLC 0xaa, 0xaa, 0x03 +#define SNAP_BRIDGED 0x00, 0x80, 0xc2 +#define SNAP_ROUTED 0x00, 0x00, 0x00 +#define PID_ETHERNET 0x00, 0x07 +#define ETHERTYPE_IPV4 0x08, 0x00 +#define ETHERTYPE_IPV6 0x86, 0xdd +#define PAD_BRIDGED 0x00, 0x00 + +static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 }; +static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 }; +static const unsigned char llc_oui_pid_pad[] = + { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED }; +static const unsigned char pad[] = { PAD_BRIDGED }; +static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 }; +static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 }; + +enum br2684_encaps { + e_vc = BR2684_ENCAPS_VC, + e_llc = BR2684_ENCAPS_LLC, +}; + +struct br2684_vcc { + struct atm_vcc *atmvcc; + struct net_device *device; + /* keep old push, pop functions for chaining */ + void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb); + void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb); + void (*old_release_cb)(struct atm_vcc *vcc); + struct module *old_owner; + enum br2684_encaps encaps; + struct list_head brvccs; +#ifdef CONFIG_ATM_BR2684_IPFILTER + struct br2684_filter filter; +#endif /* CONFIG_ATM_BR2684_IPFILTER */ + unsigned int copies_needed, copies_failed; + atomic_t qspace; +}; + +struct br2684_dev { + struct net_device *net_dev; + struct list_head br2684_devs; + int number; + struct list_head brvccs; /* one device <=> one vcc (before xmas) */ + int mac_was_set; + enum br2684_payload payload; +}; + +/* + * This lock should be held for writing any time the list of devices or + * their attached vcc's could be altered. It should be held for reading + * any time these are being queried. Note that we sometimes need to + * do read-locking under interrupting context, so write locking must block + * the current CPU's interrupts. + */ +static DEFINE_RWLOCK(devs_lock); + +static LIST_HEAD(br2684_devs); + +static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) +{ + return netdev_priv(net_dev); +} + +static inline struct net_device *list_entry_brdev(const struct list_head *le) +{ + return list_entry(le, struct br2684_dev, br2684_devs)->net_dev; +} + +static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) +{ + return (struct br2684_vcc *)(atmvcc->user_back); +} + +static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) +{ + return list_entry(le, struct br2684_vcc, brvccs); +} + +/* Caller should hold read_lock(&devs_lock) */ +static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) +{ + struct list_head *lh; + struct net_device *net_dev; + switch (s->method) { + case BR2684_FIND_BYNUM: + list_for_each(lh, &br2684_devs) { + net_dev = list_entry_brdev(lh); + if (BRPRIV(net_dev)->number == s->spec.devnum) + return net_dev; + } + break; + case BR2684_FIND_BYIFNAME: + list_for_each(lh, &br2684_devs) { + net_dev = list_entry_brdev(lh); + if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ)) + return net_dev; + } + break; + } + return NULL; +} + +static int atm_dev_event(struct notifier_block *this, unsigned long event, + void *arg) +{ + struct atm_dev *atm_dev = arg; + struct list_head *lh; + struct net_device *net_dev; + struct br2684_vcc *brvcc; + struct atm_vcc *atm_vcc; + unsigned long flags; + + pr_debug("event=%ld dev=%p\n", event, atm_dev); + + read_lock_irqsave(&devs_lock, flags); + list_for_each(lh, &br2684_devs) { + net_dev = list_entry_brdev(lh); + + list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) { + atm_vcc = brvcc->atmvcc; + if (atm_vcc && brvcc->atmvcc->dev == atm_dev) { + + if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST) + netif_carrier_off(net_dev); + else + netif_carrier_on(net_dev); + + } + } + } + read_unlock_irqrestore(&devs_lock, flags); + + return NOTIFY_DONE; +} + +static struct notifier_block atm_dev_notifier = { + .notifier_call = atm_dev_event, +}; + +/* chained vcc->pop function. Check if we should wake the netif_queue */ +static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb) +{ + struct br2684_vcc *brvcc = BR2684_VCC(vcc); + + pr_debug("(vcc %p ; net_dev %p )\n", vcc, brvcc->device); + brvcc->old_pop(vcc, skb); + + /* If the queue space just went up from zero, wake */ + if (atomic_inc_return(&brvcc->qspace) == 1) + netif_wake_queue(brvcc->device); +} + +/* + * Send a packet out a particular vcc. Not to useful right now, but paves + * the way for multiple vcc's per itf. Returns true if we can send, + * otherwise false + */ +static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev, + struct br2684_vcc *brvcc) +{ + struct br2684_dev *brdev = BRPRIV(dev); + struct atm_vcc *atmvcc; + int minheadroom = (brvcc->encaps == e_llc) ? + ((brdev->payload == p_bridged) ? + sizeof(llc_oui_pid_pad) : sizeof(llc_oui_ipv4)) : + ((brdev->payload == p_bridged) ? BR2684_PAD_LEN : 0); + + if (skb_headroom(skb) < minheadroom) { + struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); + brvcc->copies_needed++; + dev_kfree_skb(skb); + if (skb2 == NULL) { + brvcc->copies_failed++; + return 0; + } + skb = skb2; + } + + if (brvcc->encaps == e_llc) { + if (brdev->payload == p_bridged) { + skb_push(skb, sizeof(llc_oui_pid_pad)); + skb_copy_to_linear_data(skb, llc_oui_pid_pad, + sizeof(llc_oui_pid_pad)); + } else if (brdev->payload == p_routed) { + unsigned short prot = ntohs(skb->protocol); + + skb_push(skb, sizeof(llc_oui_ipv4)); + switch (prot) { + case ETH_P_IP: + skb_copy_to_linear_data(skb, llc_oui_ipv4, + sizeof(llc_oui_ipv4)); + break; + case ETH_P_IPV6: + skb_copy_to_linear_data(skb, llc_oui_ipv6, + sizeof(llc_oui_ipv6)); + break; + default: + dev_kfree_skb(skb); + return 0; + } + } + } else { /* e_vc */ + if (brdev->payload == p_bridged) { + skb_push(skb, 2); + memset(skb->data, 0, 2); + } + } + skb_debug(skb); + + ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; + pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); + atm_account_tx(atmvcc, skb); + dev->stats.tx_packets++; + dev->stats.tx_bytes += skb->len; + + if (atomic_dec_return(&brvcc->qspace) < 1) { + /* No more please! */ + netif_stop_queue(brvcc->device); + /* We might have raced with br2684_pop() */ + if (unlikely(atomic_read(&brvcc->qspace) > 0)) + netif_wake_queue(brvcc->device); + } + + /* If this fails immediately, the skb will be freed and br2684_pop() + will wake the queue if appropriate. Just return an error so that + the stats are updated correctly */ + return !atmvcc->send(atmvcc, skb); +} + +static void br2684_release_cb(struct atm_vcc *atmvcc) +{ + struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); + + if (atomic_read(&brvcc->qspace) > 0) + netif_wake_queue(brvcc->device); + + if (brvcc->old_release_cb) + brvcc->old_release_cb(atmvcc); +} + +static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb, + const struct br2684_dev *brdev) +{ + return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ +} + +static netdev_tx_t br2684_start_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct br2684_dev *brdev = BRPRIV(dev); + struct br2684_vcc *brvcc; + struct atm_vcc *atmvcc; + netdev_tx_t ret = NETDEV_TX_OK; + + pr_debug("skb_dst(skb)=%p\n", skb_dst(skb)); + read_lock(&devs_lock); + brvcc = pick_outgoing_vcc(skb, brdev); + if (brvcc == NULL) { + pr_debug("no vcc attached to dev %s\n", dev->name); + dev->stats.tx_errors++; + dev->stats.tx_carrier_errors++; + /* netif_stop_queue(dev); */ + dev_kfree_skb(skb); + goto out_devs; + } + atmvcc = brvcc->atmvcc; + + bh_lock_sock(sk_atm(atmvcc)); + + if (test_bit(ATM_VF_CLOSE, &atmvcc->flags) || + !test_bit(ATM_VF_READY, &atmvcc->flags)) { + dev->stats.tx_dropped++; + dev_kfree_skb(skb); + goto out; + } + + if (sock_owned_by_user(sk_atm(atmvcc))) { + netif_stop_queue(brvcc->device); + ret = NETDEV_TX_BUSY; + goto out; + } + + if (!br2684_xmit_vcc(skb, dev, brvcc)) { + /* + * We should probably use netif_*_queue() here, but that + * involves added complication. We need to walk before + * we can run. + * + * Don't free here! this pointer might be no longer valid! + */ + dev->stats.tx_errors++; + dev->stats.tx_fifo_errors++; + } + out: + bh_unlock_sock(sk_atm(atmvcc)); + out_devs: + read_unlock(&devs_lock); + return ret; +} + +/* + * We remember when the MAC gets set, so we don't override it later with + * the ESI of the ATM card of the first VC + */ +static int br2684_mac_addr(struct net_device *dev, void *p) +{ + int err = eth_mac_addr(dev, p); + if (!err) + BRPRIV(dev)->mac_was_set = 1; + return err; +} + +#ifdef CONFIG_ATM_BR2684_IPFILTER +/* this IOCTL is experimental. */ +static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) +{ + struct br2684_vcc *brvcc; + struct br2684_filter_set fs; + + if (copy_from_user(&fs, arg, sizeof fs)) + return -EFAULT; + if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { + /* + * This is really a per-vcc thing, but we can also search + * by device. + */ + struct br2684_dev *brdev; + read_lock(&devs_lock); + brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); + if (brdev == NULL || list_empty(&brdev->brvccs) || + brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ + brvcc = NULL; + else + brvcc = list_entry_brvcc(brdev->brvccs.next); + read_unlock(&devs_lock); + if (brvcc == NULL) + return -ESRCH; + } else + brvcc = BR2684_VCC(atmvcc); + memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); + return 0; +} + +/* Returns 1 if packet should be dropped */ +static inline int +packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) +{ + if (brvcc->filter.netmask == 0) + return 0; /* no filter in place */ + if (type == htons(ETH_P_IP) && + (((struct iphdr *)(skb->data))->daddr & brvcc->filter. + netmask) == brvcc->filter.prefix) + return 0; + if (type == htons(ETH_P_ARP)) + return 0; + /* + * TODO: we should probably filter ARPs too.. don't want to have + * them returning values that don't make sense, or is that ok? + */ + return 1; /* drop */ +} +#endif /* CONFIG_ATM_BR2684_IPFILTER */ + +static void br2684_close_vcc(struct br2684_vcc *brvcc) +{ + pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); + write_lock_irq(&devs_lock); + list_del(&brvcc->brvccs); + write_unlock_irq(&devs_lock); + brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ + brvcc->atmvcc->release_cb = brvcc->old_release_cb; + brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ + module_put(brvcc->old_owner); + kfree(brvcc); +} + +/* when AAL5 PDU comes in: */ +static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) +{ + struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); + struct net_device *net_dev = brvcc->device; + struct br2684_dev *brdev = BRPRIV(net_dev); + + pr_debug("\n"); + + if (unlikely(skb == NULL)) { + /* skb==NULL means VCC is being destroyed */ + br2684_close_vcc(brvcc); + if (list_empty(&brdev->brvccs)) { + write_lock_irq(&devs_lock); + list_del(&brdev->br2684_devs); + write_unlock_irq(&devs_lock); + unregister_netdev(net_dev); + free_netdev(net_dev); + } + return; + } + + skb_debug(skb); + atm_return(atmvcc, skb->truesize); + pr_debug("skb from brdev %p\n", brdev); + if (brvcc->encaps == e_llc) { + + if (skb->len > 7 && skb->data[7] == 0x01) + __skb_trim(skb, skb->len - 4); + + /* accept packets that have "ipv[46]" in the snap header */ + if ((skb->len >= (sizeof(llc_oui_ipv4))) && + (memcmp(skb->data, llc_oui_ipv4, + sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { + if (memcmp(skb->data + 6, ethertype_ipv6, + sizeof(ethertype_ipv6)) == 0) + skb->protocol = htons(ETH_P_IPV6); + else if (memcmp(skb->data + 6, ethertype_ipv4, + sizeof(ethertype_ipv4)) == 0) + skb->protocol = htons(ETH_P_IP); + else + goto error; + skb_pull(skb, sizeof(llc_oui_ipv4)); + skb_reset_network_header(skb); + skb->pkt_type = PACKET_HOST; + /* + * Let us waste some time for checking the encapsulation. + * Note, that only 7 char is checked so frames with a valid FCS + * are also accepted (but FCS is not checked of course). + */ + } else if ((skb->len >= sizeof(llc_oui_pid_pad)) && + (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { + skb_pull(skb, sizeof(llc_oui_pid_pad)); + skb->protocol = eth_type_trans(skb, net_dev); + } else + goto error; + + } else { /* e_vc */ + if (brdev->payload == p_routed) { + struct iphdr *iph; + + skb_reset_network_header(skb); + iph = ip_hdr(skb); + if (iph->version == 4) + skb->protocol = htons(ETH_P_IP); + else if (iph->version == 6) + skb->protocol = htons(ETH_P_IPV6); + else + goto error; + skb->pkt_type = PACKET_HOST; + } else { /* p_bridged */ + /* first 2 chars should be 0 */ + if (memcmp(skb->data, pad, BR2684_PAD_LEN) != 0) + goto error; + skb_pull(skb, BR2684_PAD_LEN); + skb->protocol = eth_type_trans(skb, net_dev); + } + } + +#ifdef CONFIG_ATM_BR2684_IPFILTER + if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) + goto dropped; +#endif /* CONFIG_ATM_BR2684_IPFILTER */ + skb->dev = net_dev; + ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ + pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); + skb_debug(skb); + /* sigh, interface is down? */ + if (unlikely(!(net_dev->flags & IFF_UP))) + goto dropped; + net_dev->stats.rx_packets++; + net_dev->stats.rx_bytes += skb->len; + memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); + netif_rx(skb); + return; + +dropped: + net_dev->stats.rx_dropped++; + goto free_skb; +error: + net_dev->stats.rx_errors++; +free_skb: + dev_kfree_skb(skb); +} + +/* + * Assign a vcc to a dev + * Note: we do not have explicit unassign, but look at _push() + */ +static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) +{ + struct br2684_vcc *brvcc; + struct br2684_dev *brdev; + struct net_device *net_dev; + struct atm_backend_br2684 be; + int err; + + if (copy_from_user(&be, arg, sizeof be)) + return -EFAULT; + brvcc = kzalloc_obj(struct br2684_vcc); + if (!brvcc) + return -ENOMEM; + /* + * Allow two packets in the ATM queue. One actually being sent, and one + * for the ATM 'TX done' handler to send. It shouldn't take long to get + * the next one from the netdev queue, when we need it. More than that + * would be bufferbloat. + */ + atomic_set(&brvcc->qspace, 2); + write_lock_irq(&devs_lock); + net_dev = br2684_find_dev(&be.ifspec); + if (net_dev == NULL) { + pr_err("tried to attach to non-existent device\n"); + err = -ENXIO; + goto error; + } + brdev = BRPRIV(net_dev); + if (atmvcc->push == NULL) { + err = -EBADFD; + goto error; + } + if (!list_empty(&brdev->brvccs)) { + /* Only 1 VCC/dev right now */ + err = -EEXIST; + goto error; + } + if (be.fcs_in != BR2684_FCSIN_NO || + be.fcs_out != BR2684_FCSOUT_NO || + be.fcs_auto || be.has_vpiid || be.send_padding || + (be.encaps != BR2684_ENCAPS_VC && + be.encaps != BR2684_ENCAPS_LLC) || + be.min_size != 0) { + err = -EINVAL; + goto error; + } + pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc); + if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { + unsigned char *esi = atmvcc->dev->esi; + const u8 one = 1; + + if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) + dev_addr_set(net_dev, esi); + else + dev_addr_mod(net_dev, 2, &one, 1); + } + list_add(&brvcc->brvccs, &brdev->brvccs); + write_unlock_irq(&devs_lock); + brvcc->device = net_dev; + brvcc->atmvcc = atmvcc; + atmvcc->user_back = brvcc; + brvcc->encaps = (enum br2684_encaps)be.encaps; + brvcc->old_push = atmvcc->push; + brvcc->old_pop = atmvcc->pop; + brvcc->old_release_cb = atmvcc->release_cb; + brvcc->old_owner = atmvcc->owner; + barrier(); + atmvcc->push = br2684_push; + atmvcc->pop = br2684_pop; + atmvcc->release_cb = br2684_release_cb; + atmvcc->owner = THIS_MODULE; + + /* initialize netdev carrier state */ + if (atmvcc->dev->signal == ATM_PHY_SIG_LOST) + netif_carrier_off(net_dev); + else + netif_carrier_on(net_dev); + + __module_get(THIS_MODULE); + + /* re-process everything received between connection setup and + backend setup */ + vcc_process_recv_queue(atmvcc); + return 0; + +error: + write_unlock_irq(&devs_lock); + kfree(brvcc); + return err; +} + +static const struct net_device_ops br2684_netdev_ops = { + .ndo_start_xmit = br2684_start_xmit, + .ndo_set_mac_address = br2684_mac_addr, + .ndo_validate_addr = eth_validate_addr, +}; + +static const struct net_device_ops br2684_netdev_ops_routed = { + .ndo_start_xmit = br2684_start_xmit, + .ndo_set_mac_address = br2684_mac_addr, +}; + +static void br2684_setup(struct net_device *netdev) +{ + struct br2684_dev *brdev = BRPRIV(netdev); + + ether_setup(netdev); + netdev->hard_header_len += sizeof(llc_oui_pid_pad); /* worst case */ + brdev->net_dev = netdev; + + netdev->netdev_ops = &br2684_netdev_ops; + + INIT_LIST_HEAD(&brdev->brvccs); +} + +static void br2684_setup_routed(struct net_device *netdev) +{ + struct br2684_dev *brdev = BRPRIV(netdev); + + brdev->net_dev = netdev; + netdev->hard_header_len = sizeof(llc_oui_ipv4); /* worst case */ + netdev->netdev_ops = &br2684_netdev_ops_routed; + netdev->addr_len = 0; + netdev->mtu = ETH_DATA_LEN; + netdev->min_mtu = 0; + netdev->max_mtu = ETH_MAX_MTU; + netdev->type = ARPHRD_PPP; + netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; + netdev->tx_queue_len = 100; + INIT_LIST_HEAD(&brdev->brvccs); +} + +static int br2684_create(void __user *arg) +{ + int err; + struct net_device *netdev; + struct br2684_dev *brdev; + struct atm_newif_br2684 ni; + enum br2684_payload payload; + + pr_debug("\n"); + + if (copy_from_user(&ni, arg, sizeof ni)) + return -EFAULT; + + if (ni.media & BR2684_FLAG_ROUTED) + payload = p_routed; + else + payload = p_bridged; + ni.media &= 0xffff; /* strip flags */ + + if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) + return -EINVAL; + + netdev = alloc_netdev(sizeof(struct br2684_dev), + ni.ifname[0] ? ni.ifname : "nas%d", + NET_NAME_UNKNOWN, + (payload == p_routed) ? br2684_setup_routed : br2684_setup); + if (!netdev) + return -ENOMEM; + + brdev = BRPRIV(netdev); + + pr_debug("registered netdev %s\n", netdev->name); + /* open, stop, do_ioctl ? */ + err = register_netdev(netdev); + if (err < 0) { + pr_err("register_netdev failed\n"); + free_netdev(netdev); + return err; + } + + write_lock_irq(&devs_lock); + + brdev->payload = payload; + + if (list_empty(&br2684_devs)) { + /* 1st br2684 device */ + brdev->number = 1; + } else + brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; + + list_add_tail(&brdev->br2684_devs, &br2684_devs); + write_unlock_irq(&devs_lock); + return 0; +} + +/* + * This handles ioctls actually performed on our vcc - we must return + * -ENOIOCTLCMD for any unrecognized ioctl + */ +static int br2684_ioctl(struct socket *sock, unsigned int cmd, + unsigned long arg) +{ + struct atm_vcc *atmvcc = ATM_SD(sock); + void __user *argp = (void __user *)arg; + atm_backend_t b; + + int err; + switch (cmd) { + case ATM_SETBACKEND: + case ATM_NEWBACKENDIF: + err = get_user(b, (atm_backend_t __user *) argp); + if (err) + return -EFAULT; + if (b != ATM_BACKEND_BR2684) + return -ENOIOCTLCMD; + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + if (cmd == ATM_SETBACKEND) { + if (sock->state != SS_CONNECTED) + return -EINVAL; + return br2684_regvcc(atmvcc, argp); + } else { + return br2684_create(argp); + } +#ifdef CONFIG_ATM_BR2684_IPFILTER + case BR2684_SETFILT: + if (atmvcc->push != br2684_push) + return -ENOIOCTLCMD; + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + err = br2684_setfilt(atmvcc, argp); + + return err; +#endif /* CONFIG_ATM_BR2684_IPFILTER */ + } + return -ENOIOCTLCMD; +} + +static struct atm_ioctl br2684_ioctl_ops = { + .owner = THIS_MODULE, + .ioctl = br2684_ioctl, +}; + +#ifdef CONFIG_PROC_FS +static void *br2684_seq_start(struct seq_file *seq, loff_t * pos) + __acquires(devs_lock) +{ + read_lock(&devs_lock); + return seq_list_start(&br2684_devs, *pos); +} + +static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos) +{ + return seq_list_next(v, &br2684_devs, pos); +} + +static void br2684_seq_stop(struct seq_file *seq, void *v) + __releases(devs_lock) +{ + read_unlock(&devs_lock); +} + +static int br2684_seq_show(struct seq_file *seq, void *v) +{ + const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, + br2684_devs); + const struct net_device *net_dev = brdev->net_dev; + const struct br2684_vcc *brvcc; + + seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n", + net_dev->name, + brdev->number, + net_dev->dev_addr, + brdev->mac_was_set ? "set" : "auto"); + + list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { + seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s" + ", failed copies %u/%u" + "\n", brvcc->atmvcc->dev->number, + brvcc->atmvcc->vpi, brvcc->atmvcc->vci, + (brvcc->encaps == e_llc) ? "LLC" : "VC", + (brdev->payload == p_bridged) ? "bridged" : "routed", + brvcc->copies_failed, brvcc->copies_needed); +#ifdef CONFIG_ATM_BR2684_IPFILTER + if (brvcc->filter.netmask != 0) + seq_printf(seq, " filter=%pI4/%pI4\n", + &brvcc->filter.prefix, + &brvcc->filter.netmask); +#endif /* CONFIG_ATM_BR2684_IPFILTER */ + } + return 0; +} + +static const struct seq_operations br2684_seq_ops = { + .start = br2684_seq_start, + .next = br2684_seq_next, + .stop = br2684_seq_stop, + .show = br2684_seq_show, +}; + +extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ +#endif /* CONFIG_PROC_FS */ + +static int __init br2684_init(void) +{ +#ifdef CONFIG_PROC_FS + struct proc_dir_entry *p; + p = proc_create_seq("br2684", 0, atm_proc_root, &br2684_seq_ops); + if (p == NULL) + return -ENOMEM; +#endif + register_atm_ioctl(&br2684_ioctl_ops); + register_atmdevice_notifier(&atm_dev_notifier); + return 0; +} + +static void __exit br2684_exit(void) +{ + struct net_device *net_dev; + struct br2684_dev *brdev; + struct br2684_vcc *brvcc; + deregister_atm_ioctl(&br2684_ioctl_ops); + +#ifdef CONFIG_PROC_FS + remove_proc_entry("br2684", atm_proc_root); +#endif + + + unregister_atmdevice_notifier(&atm_dev_notifier); + + while (!list_empty(&br2684_devs)) { + net_dev = list_entry_brdev(br2684_devs.next); + brdev = BRPRIV(net_dev); + while (!list_empty(&brdev->brvccs)) { + brvcc = list_entry_brvcc(brdev->brvccs.next); + br2684_close_vcc(brvcc); + } + + list_del(&brdev->br2684_devs); + unregister_netdev(net_dev); + free_netdev(net_dev); + } +} + +module_init(br2684_init); +module_exit(br2684_exit); + +MODULE_AUTHOR("Marcell GAL"); +MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); +MODULE_LICENSE("GPL"); diff --git a/net/atm/common.c b/net/atm/common.c new file mode 100644 index 000000000..81195727f --- /dev/null +++ b/net/atm/common.c @@ -0,0 +1,857 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* net/atm/common.c - ATM sockets (common part for PVC and SVC) */ + +/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ + +#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ + +#include <linux/module.h> +#include <linux/kmod.h> +#include <linux/net.h> /* struct socket, struct proto_ops */ +#include <linux/atm.h> /* ATM stuff */ +#include <linux/atmdev.h> +#include <linux/socket.h> /* SOL_SOCKET */ +#include <linux/errno.h> /* error codes */ +#include <linux/capability.h> +#include <linux/mm.h> +#include <linux/sched/signal.h> +#include <linux/time64.h> /* 64-bit time for seconds */ +#include <linux/skbuff.h> +#include <linux/bitops.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <net/sock.h> /* struct sock */ +#include <linux/uaccess.h> +#include <linux/poll.h> +#include <linux/uio.h> + +#include <linux/atomic.h> + +#include "resources.h" /* atm_find_dev */ +#include "common.h" /* prototypes */ +#include "protocols.h" /* atm_init_<transport> */ + +struct hlist_head vcc_hash[VCC_HTABLE_SIZE]; +EXPORT_SYMBOL(vcc_hash); + +DEFINE_RWLOCK(vcc_sklist_lock); +EXPORT_SYMBOL(vcc_sklist_lock); + +static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain); + +static void __vcc_insert_socket(struct sock *sk) +{ + struct atm_vcc *vcc = atm_sk(sk); + struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)]; + sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1); + sk_add_node(sk, head); +} + +void vcc_insert_socket(struct sock *sk) +{ + write_lock_irq(&vcc_sklist_lock); + __vcc_insert_socket(sk); + write_unlock_irq(&vcc_sklist_lock); +} +EXPORT_SYMBOL(vcc_insert_socket); + +static void vcc_remove_socket(struct sock *sk) +{ + write_lock_irq(&vcc_sklist_lock); + sk_del_node_init(sk); + write_unlock_irq(&vcc_sklist_lock); +} + +static bool vcc_tx_ready(struct atm_vcc *vcc, unsigned int size) +{ + struct sock *sk = sk_atm(vcc); + + if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) { + pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n", + sk_wmem_alloc_get(sk), size, sk->sk_sndbuf); + return false; + } + return true; +} + +static void vcc_sock_destruct(struct sock *sk) +{ + if (atomic_read(&sk->sk_rmem_alloc)) + printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n", + __func__, atomic_read(&sk->sk_rmem_alloc)); + + if (refcount_read(&sk->sk_wmem_alloc)) + printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n", + __func__, refcount_read(&sk->sk_wmem_alloc)); +} + +static void vcc_def_wakeup(struct sock *sk) +{ + struct socket_wq *wq; + + rcu_read_lock(); + wq = rcu_dereference(sk->sk_wq); + if (skwq_has_sleeper(wq)) + wake_up(&wq->wait); + rcu_read_unlock(); +} + +static inline int vcc_writable(struct sock *sk) +{ + struct atm_vcc *vcc = atm_sk(sk); + + return (vcc->qos.txtp.max_sdu + + refcount_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf; +} + +static void vcc_write_space(struct sock *sk) +{ + struct socket_wq *wq; + + rcu_read_lock(); + + if (vcc_writable(sk)) { + wq = rcu_dereference(sk->sk_wq); + if (skwq_has_sleeper(wq)) + wake_up_interruptible(&wq->wait); + + sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT); + } + + rcu_read_unlock(); +} + +static void vcc_release_cb(struct sock *sk) +{ + struct atm_vcc *vcc = atm_sk(sk); + + if (vcc->release_cb) + vcc->release_cb(vcc); +} + +static struct proto vcc_proto = { + .name = "VCC", + .owner = THIS_MODULE, + .obj_size = sizeof(struct atm_vcc), + .release_cb = vcc_release_cb, +}; + +int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern) +{ + struct sock *sk; + struct atm_vcc *vcc; + + sock->sk = NULL; + if (sock->type == SOCK_STREAM) + return -EINVAL; + sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto, kern); + if (!sk) + return -ENOMEM; + sock_init_data(sock, sk); + sk->sk_state_change = vcc_def_wakeup; + sk->sk_write_space = vcc_write_space; + + vcc = atm_sk(sk); + vcc->dev = NULL; + vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */ + refcount_set(&sk->sk_wmem_alloc, SK_WMEM_ALLOC_BIAS); + atomic_set(&sk->sk_rmem_alloc, 0); + vcc->push = NULL; + vcc->pop = NULL; + vcc->owner = NULL; + vcc->release_cb = NULL; + vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */ + vcc->atm_options = vcc->aal_options = 0; + sk->sk_destruct = vcc_sock_destruct; + return 0; +} + +static void vcc_destroy_socket(struct sock *sk) +{ + struct atm_vcc *vcc = atm_sk(sk); + struct sk_buff *skb; + + set_bit(ATM_VF_CLOSE, &vcc->flags); + clear_bit(ATM_VF_READY, &vcc->flags); + if (vcc->dev && vcc->dev->ops->close) + vcc->dev->ops->close(vcc); + if (vcc->push) + vcc->push(vcc, NULL); /* atmarpd has no push */ + module_put(vcc->owner); + + while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { + atm_return(vcc, skb->truesize); + kfree_skb(skb); + } + + if (vcc->dev && vcc->dev->ops->owner) { + module_put(vcc->dev->ops->owner); + atm_dev_put(vcc->dev); + } + + vcc_remove_socket(sk); +} + +int vcc_release(struct socket *sock) +{ + struct sock *sk = sock->sk; + + if (sk) { + lock_sock(sk); + vcc_destroy_socket(sock->sk); + release_sock(sk); + sock_put(sk); + } + + return 0; +} + +void vcc_release_async(struct atm_vcc *vcc, int reply) +{ + struct sock *sk = sk_atm(vcc); + + set_bit(ATM_VF_CLOSE, &vcc->flags); + sk->sk_shutdown |= RCV_SHUTDOWN; + sk->sk_err = -reply; + sk->sk_state_change(sk); +} +EXPORT_SYMBOL(vcc_release_async); + +void vcc_process_recv_queue(struct atm_vcc *vcc) +{ + struct sk_buff_head queue, *rq; + struct sk_buff *skb, *tmp; + unsigned long flags; + + __skb_queue_head_init(&queue); + rq = &sk_atm(vcc)->sk_receive_queue; + + spin_lock_irqsave(&rq->lock, flags); + skb_queue_splice_init(rq, &queue); + spin_unlock_irqrestore(&rq->lock, flags); + + skb_queue_walk_safe(&queue, skb, tmp) { + __skb_unlink(skb, &queue); + vcc->push(vcc, skb); + } +} +EXPORT_SYMBOL(vcc_process_recv_queue); + +void atm_dev_signal_change(struct atm_dev *dev, char signal) +{ + pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n", + __func__, signal, dev, dev->number, dev->signal); + + /* atm driver sending invalid signal */ + WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND); + + if (dev->signal == signal) + return; /* no change */ + + dev->signal = signal; + + atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev); +} +EXPORT_SYMBOL(atm_dev_signal_change); + +void atm_dev_release_vccs(struct atm_dev *dev) +{ + int i; + + write_lock_irq(&vcc_sklist_lock); + for (i = 0; i < VCC_HTABLE_SIZE; i++) { + struct hlist_head *head = &vcc_hash[i]; + struct hlist_node *tmp; + struct sock *s; + struct atm_vcc *vcc; + + sk_for_each_safe(s, tmp, head) { + vcc = atm_sk(s); + if (vcc->dev == dev) { + vcc_release_async(vcc, -EPIPE); + sk_del_node_init(s); + } + } + } + write_unlock_irq(&vcc_sklist_lock); +} +EXPORT_SYMBOL(atm_dev_release_vccs); + +static int adjust_tp(struct atm_trafprm *tp, unsigned char aal) +{ + int max_sdu; + + if (!tp->traffic_class) + return 0; + switch (aal) { + case ATM_AAL0: + max_sdu = ATM_CELL_SIZE-1; + break; + default: + pr_warn("AAL problems ... (%d)\n", aal); + fallthrough; + case ATM_AAL5: + max_sdu = ATM_MAX_AAL5_PDU; + } + if (!tp->max_sdu) + tp->max_sdu = max_sdu; + else if (tp->max_sdu > max_sdu) + return -EINVAL; + if (!tp->max_cdv) + tp->max_cdv = ATM_MAX_CDV; + return 0; +} + +static int check_ci(const struct atm_vcc *vcc, short vpi, int vci) +{ + struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)]; + struct sock *s; + struct atm_vcc *walk; + + sk_for_each(s, head) { + walk = atm_sk(s); + if (walk->dev != vcc->dev) + continue; + if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi && + walk->vci == vci && ((walk->qos.txtp.traffic_class != + ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) || + (walk->qos.rxtp.traffic_class != ATM_NONE && + vcc->qos.rxtp.traffic_class != ATM_NONE))) + return -EADDRINUSE; + } + + /* allow VCCs with same VPI/VCI iff they don't collide on + TX/RX (but we may refuse such sharing for other reasons, + e.g. if protocol requires to have both channels) */ + + return 0; +} + +static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci) +{ + static short p; /* poor man's per-device cache */ + static int c; + short old_p; + int old_c; + int err; + + if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) { + err = check_ci(vcc, *vpi, *vci); + return err; + } + /* last scan may have left values out of bounds for current device */ + if (*vpi != ATM_VPI_ANY) + p = *vpi; + else if (p >= 1 << vcc->dev->ci_range.vpi_bits) + p = 0; + if (*vci != ATM_VCI_ANY) + c = *vci; + else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits) + c = ATM_NOT_RSV_VCI; + old_p = p; + old_c = c; + do { + if (!check_ci(vcc, p, c)) { + *vpi = p; + *vci = c; + return 0; + } + if (*vci == ATM_VCI_ANY) { + c++; + if (c >= 1 << vcc->dev->ci_range.vci_bits) + c = ATM_NOT_RSV_VCI; + } + if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) && + *vpi == ATM_VPI_ANY) { + p++; + if (p >= 1 << vcc->dev->ci_range.vpi_bits) + p = 0; + } + } while (old_p != p || old_c != c); + return -EADDRINUSE; +} + +static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi, + int vci) +{ + struct sock *sk = sk_atm(vcc); + int error; + + if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY && + vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC && + vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits)) + return -EINVAL; + if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE)) + return -EPERM; + error = -ENODEV; + if (!try_module_get(dev->ops->owner)) + return error; + vcc->dev = dev; + write_lock_irq(&vcc_sklist_lock); + if (test_bit(ATM_DF_REMOVED, &dev->flags) || + (error = find_ci(vcc, &vpi, &vci))) { + write_unlock_irq(&vcc_sklist_lock); + goto fail_module_put; + } + vcc->vpi = vpi; + vcc->vci = vci; + __vcc_insert_socket(sk); + write_unlock_irq(&vcc_sklist_lock); + switch (vcc->qos.aal) { + case ATM_AAL0: + error = atm_init_aal0(vcc); + vcc->stats = &dev->stats.aal0; + break; + case ATM_NO_AAL: + /* ATM_AAL5 is also used in the "0 for default" case */ + vcc->qos.aal = ATM_AAL5; + fallthrough; + case ATM_AAL5: + error = atm_init_aal5(vcc); + vcc->stats = &dev->stats.aal5; + break; + default: + error = -EPROTOTYPE; + } + if (!error) + error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal); + if (!error) + error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal); + if (error) + goto fail; + pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal); + pr_debug(" TX: %d, PCR %d..%d, SDU %d\n", + vcc->qos.txtp.traffic_class, + vcc->qos.txtp.min_pcr, + vcc->qos.txtp.max_pcr, + vcc->qos.txtp.max_sdu); + pr_debug(" RX: %d, PCR %d..%d, SDU %d\n", + vcc->qos.rxtp.traffic_class, + vcc->qos.rxtp.min_pcr, + vcc->qos.rxtp.max_pcr, + vcc->qos.rxtp.max_sdu); + + if (dev->ops->open) { + error = dev->ops->open(vcc); + if (error) + goto fail; + } + return 0; + +fail: + vcc_remove_socket(sk); +fail_module_put: + module_put(dev->ops->owner); + /* ensure we get dev module ref count correct */ + vcc->dev = NULL; + return error; +} + +int vcc_connect(struct socket *sock, int itf, short vpi, int vci) +{ + struct atm_dev *dev; + struct atm_vcc *vcc = ATM_SD(sock); + int error; + + pr_debug("(vpi %d, vci %d)\n", vpi, vci); + if (sock->state == SS_CONNECTED) + return -EISCONN; + if (sock->state != SS_UNCONNECTED) + return -EINVAL; + if (!(vpi || vci)) + return -EINVAL; + + if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC) + clear_bit(ATM_VF_PARTIAL, &vcc->flags); + else + if (test_bit(ATM_VF_PARTIAL, &vcc->flags)) + return -EINVAL; + pr_debug("(TX: cl %d,bw %d-%d,sdu %d; " + "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n", + vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr, + vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu, + vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr, + vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu, + vcc->qos.aal == ATM_AAL5 ? "" : + vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ", + vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal); + if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) + return -EBADFD; + if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS || + vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) + return -EINVAL; + if (likely(itf != ATM_ITF_ANY)) { + dev = try_then_request_module(atm_dev_lookup(itf), + "atm-device-%d", itf); + } else { + dev = NULL; + mutex_lock(&atm_dev_mutex); + if (!list_empty(&atm_devs)) { + dev = list_entry(atm_devs.next, + struct atm_dev, dev_list); + atm_dev_hold(dev); + } + mutex_unlock(&atm_dev_mutex); + } + if (!dev) + return -ENODEV; + error = __vcc_connect(vcc, dev, vpi, vci); + if (error) { + atm_dev_put(dev); + return error; + } + if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) + set_bit(ATM_VF_PARTIAL, &vcc->flags); + if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags)) + sock->state = SS_CONNECTED; + return 0; +} + +int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, + int flags) +{ + struct sock *sk = sock->sk; + struct atm_vcc *vcc; + struct sk_buff *skb; + int copied, error = -EINVAL; + + if (sock->state != SS_CONNECTED) + return -ENOTCONN; + + /* only handle MSG_DONTWAIT and MSG_PEEK */ + if (flags & ~(MSG_DONTWAIT | MSG_PEEK)) + return -EOPNOTSUPP; + + vcc = ATM_SD(sock); + if (test_bit(ATM_VF_CLOSE, &vcc->flags) || + !test_bit(ATM_VF_READY, &vcc->flags)) + return 0; + + skb = skb_recv_datagram(sk, flags, &error); + if (!skb) + return error; + + copied = skb->len; + if (copied > size) { + copied = size; + msg->msg_flags |= MSG_TRUNC; + } + + error = skb_copy_datagram_msg(skb, 0, msg, copied); + if (error) + return error; + sock_recv_cmsgs(msg, sk, skb); + + if (!(flags & MSG_PEEK)) { + pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), + skb->truesize); + atm_return(vcc, skb->truesize); + } + + skb_free_datagram(sk, skb); + return copied; +} + +int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size) +{ + struct sock *sk = sock->sk; + DEFINE_WAIT(wait); + struct atm_vcc *vcc; + struct sk_buff *skb; + int eff, error; + + lock_sock(sk); + if (sock->state != SS_CONNECTED) { + error = -ENOTCONN; + goto out; + } + if (m->msg_name) { + error = -EISCONN; + goto out; + } + vcc = ATM_SD(sock); + if (test_bit(ATM_VF_CLOSE, &vcc->flags) || + !test_bit(ATM_VF_READY, &vcc->flags)) { + error = -EPIPE; + send_sig(SIGPIPE, current, 0); + goto out; + } + if (!size) { + error = 0; + goto out; + } + if (size > vcc->qos.txtp.max_sdu) { + error = -EMSGSIZE; + goto out; + } + + eff = (size+3) & ~3; /* align to word boundary */ + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + error = 0; + while (!vcc_tx_ready(vcc, eff)) { + if (m->msg_flags & MSG_DONTWAIT) { + error = -EAGAIN; + break; + } + schedule(); + if (signal_pending(current)) { + error = -ERESTARTSYS; + break; + } + if (test_bit(ATM_VF_CLOSE, &vcc->flags) || + !test_bit(ATM_VF_READY, &vcc->flags)) { + error = -EPIPE; + send_sig(SIGPIPE, current, 0); + break; + } + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + } + finish_wait(sk_sleep(sk), &wait); + if (error) + goto out; + + skb = alloc_skb(eff, GFP_KERNEL); + if (!skb) { + error = -ENOMEM; + goto out; + } + pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize); + atm_account_tx(vcc, skb); + + skb->dev = NULL; /* for paths shared with net_device interfaces */ + if (!copy_from_iter_full(skb_put(skb, size), size, &m->msg_iter)) { + error = -EFAULT; + goto free_skb; + } + if (eff != size) + memset(skb->data + size, 0, eff-size); + + error = vcc->dev->ops->send(vcc, skb); + error = error ? error : size; +out: + release_sock(sk); + return error; +free_skb: + atm_return_tx(vcc, skb); + kfree_skb(skb); + goto out; +} + +__poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait) +{ + struct sock *sk = sock->sk; + struct atm_vcc *vcc; + __poll_t mask; + + sock_poll_wait(file, sock, wait); + mask = 0; + + vcc = ATM_SD(sock); + + /* exceptional events */ + if (sk->sk_err) + mask = EPOLLERR; + + if (test_bit(ATM_VF_CLOSE, &vcc->flags)) + mask |= EPOLLHUP; + + /* readable? */ + if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) + mask |= EPOLLIN | EPOLLRDNORM; + + /* writable? */ + if (vcc->qos.txtp.traffic_class != ATM_NONE && + vcc_writable(sk)) + mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; + + return mask; +} + +static int check_tp(const struct atm_trafprm *tp) +{ + /* @@@ Should be merged with adjust_tp */ + if (tp->traffic_class > ATM_ANYCLASS) + return -EINVAL; + if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS) + return 0; + if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr && + !tp->max_pcr) + return -EINVAL; + if (tp->min_pcr == ATM_MAX_PCR) + return -EINVAL; + if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR && + tp->min_pcr > tp->max_pcr) + return -EINVAL; + /* + * We allow pcr to be outside [min_pcr,max_pcr], because later + * adjustment may still push it in the valid range. + */ + return 0; +} + +static int check_qos(const struct atm_qos *qos) +{ + int error; + + if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class) + return -EINVAL; + if (qos->txtp.traffic_class != qos->rxtp.traffic_class && + qos->txtp.traffic_class && qos->rxtp.traffic_class && + qos->txtp.traffic_class != ATM_ANYCLASS && + qos->rxtp.traffic_class != ATM_ANYCLASS) + return -EINVAL; + error = check_tp(&qos->txtp); + if (error) + return error; + return check_tp(&qos->rxtp); +} + +int vcc_setsockopt(struct socket *sock, int level, int optname, + sockptr_t optval, unsigned int optlen) +{ + struct atm_vcc *vcc; + int value; + int error; + + if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) + return -EINVAL; + + vcc = ATM_SD(sock); + switch (optname) { + case SO_ATMQOS: + { + struct atm_qos qos; + + error = copy_safe_from_sockptr(&qos, sizeof(qos), optval, + optlen); + if (error) + return error; + error = check_qos(&qos); + if (error) + return error; + /* QoS cannot be renegotiated on an already connected VCC. */ + if (sock->state == SS_CONNECTED) + return -EOPNOTSUPP; + if (sock->state != SS_UNCONNECTED) + return -EBADFD; + vcc->qos = qos; + set_bit(ATM_VF_HASQOS, &vcc->flags); + return 0; + } + case SO_SETCLP: + error = copy_safe_from_sockptr(&value, sizeof(value), optval, + optlen); + if (error) + return error; + if (value) + vcc->atm_options |= ATM_ATMOPT_CLP; + else + vcc->atm_options &= ~ATM_ATMOPT_CLP; + return 0; + default: + return -EINVAL; + } +} + +int vcc_getsockopt(struct socket *sock, int level, int optname, + sockopt_t *opt) +{ + struct atm_vcc *vcc; + int val; + int len; + + len = opt->optlen; + if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname)) + return -EINVAL; + + vcc = ATM_SD(sock); + switch (optname) { + case SO_ATMQOS: + if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) + return -EINVAL; + return copy_to_iter(&vcc->qos, sizeof(vcc->qos), + &opt->iter_out) != sizeof(vcc->qos) + ? -EFAULT : 0; + case SO_SETCLP: + val = vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0; + return copy_to_iter(&val, sizeof(val), &opt->iter_out) != + sizeof(val) ? -EFAULT : 0; + case SO_ATMPVC: + { + struct sockaddr_atmpvc pvc; + + if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags)) + return -ENOTCONN; + memset(&pvc, 0, sizeof(pvc)); + pvc.sap_family = AF_ATMPVC; + pvc.sap_addr.itf = vcc->dev->number; + pvc.sap_addr.vpi = vcc->vpi; + pvc.sap_addr.vci = vcc->vci; + return copy_to_iter(&pvc, sizeof(pvc), &opt->iter_out) != + sizeof(pvc) ? -EFAULT : 0; + } + default: + return -EINVAL; + } +} + +int register_atmdevice_notifier(struct notifier_block *nb) +{ + return atomic_notifier_chain_register(&atm_dev_notify_chain, nb); +} +EXPORT_SYMBOL_GPL(register_atmdevice_notifier); + +void unregister_atmdevice_notifier(struct notifier_block *nb) +{ + atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb); +} +EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier); + +static int __init atm_init(void) +{ + int error; + + error = proto_register(&vcc_proto, 0); + if (error < 0) + goto out; + error = atmpvc_init(); + if (error < 0) { + pr_err("atmpvc_init() failed with %d\n", error); + goto out_unregister_vcc_proto; + } + error = atm_proc_init(); + if (error < 0) { + pr_err("atm_proc_init() failed with %d\n", error); + goto out_atmpvc_exit; + } + error = atm_sysfs_init(); + if (error < 0) { + pr_err("atm_sysfs_init() failed with %d\n", error); + goto out_atmproc_exit; + } +out: + return error; +out_atmproc_exit: + atm_proc_exit(); +out_atmpvc_exit: + atmpvc_exit(); +out_unregister_vcc_proto: + proto_unregister(&vcc_proto); + goto out; +} + +static void __exit atm_exit(void) +{ + atm_proc_exit(); + atm_sysfs_exit(); + atmpvc_exit(); + proto_unregister(&vcc_proto); +} + +subsys_initcall(atm_init); + +module_exit(atm_exit); + +MODULE_DESCRIPTION("Asynchronous Transfer Mode (ATM) networking core"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_NETPROTO(PF_ATMPVC); diff --git a/net/atm/common.h b/net/atm/common.h new file mode 100644 index 000000000..11cb51dd7 --- /dev/null +++ b/net/atm/common.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* net/atm/common.h - ATM sockets (common part for PVC and SVC) */ + +/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ + + +#ifndef NET_ATM_COMMON_H +#define NET_ATM_COMMON_H + +#include <linux/net.h> +#include <linux/poll.h> /* for poll_table */ + + +int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern); +int vcc_release(struct socket *sock); +int vcc_connect(struct socket *sock, int itf, short vpi, int vci); +int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, + int flags); +int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len); +__poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait); +int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); +int vcc_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); +int vcc_setsockopt(struct socket *sock, int level, int optname, + sockptr_t optval, unsigned int optlen); +int vcc_getsockopt(struct socket *sock, int level, int optname, + sockopt_t *opt); +void vcc_process_recv_queue(struct atm_vcc *vcc); + +int atmpvc_init(void); +void atmpvc_exit(void); +int atm_sysfs_init(void); +void atm_sysfs_exit(void); + +#ifdef CONFIG_PROC_FS +int atm_proc_init(void); +void atm_proc_exit(void); +#else +static inline int atm_proc_init(void) +{ + return 0; +} + +static inline void atm_proc_exit(void) +{ + /* nothing */ +} +#endif /* CONFIG_PROC_FS */ + +void atm_dev_release_vccs(struct atm_dev *dev); + +#endif diff --git a/net/atm/ioctl.c b/net/atm/ioctl.c new file mode 100644 index 000000000..194587fc1 --- /dev/null +++ b/net/atm/ioctl.c @@ -0,0 +1,293 @@ +// SPDX-License-Identifier: GPL-2.0 +/* ATM ioctl handling */ + +/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ +/* 2003 John Levon <levon@movementarian.org> */ + +#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ + +#include <linux/module.h> +#include <linux/kmod.h> +#include <linux/net.h> /* struct socket, struct proto_ops */ +#include <linux/atm.h> /* ATM stuff */ +#include <linux/atmdev.h> +#include <linux/capability.h> +#include <linux/mutex.h> +#include <asm/ioctls.h> +#include <net/compat.h> + +#include "resources.h" +#include "common.h" + + +static DEFINE_MUTEX(ioctl_mutex); +static LIST_HEAD(ioctl_list); + + +void register_atm_ioctl(struct atm_ioctl *ioctl) +{ + mutex_lock(&ioctl_mutex); + list_add_tail(&ioctl->list, &ioctl_list); + mutex_unlock(&ioctl_mutex); +} +EXPORT_SYMBOL(register_atm_ioctl); + +void deregister_atm_ioctl(struct atm_ioctl *ioctl) +{ + mutex_lock(&ioctl_mutex); + list_del(&ioctl->list); + mutex_unlock(&ioctl_mutex); +} +EXPORT_SYMBOL(deregister_atm_ioctl); + +static int do_vcc_ioctl(struct socket *sock, unsigned int cmd, + unsigned long arg, int compat) +{ + struct sock *sk = sock->sk; + struct atm_vcc *vcc; + int error; + struct list_head *pos; + void __user *argp = (void __user *)arg; + void __user *buf; + int __user *len; + + vcc = ATM_SD(sock); + switch (cmd) { + case SIOCOUTQ: + if (sock->state != SS_CONNECTED || + !test_bit(ATM_VF_READY, &vcc->flags)) { + error = -EINVAL; + goto done; + } + error = put_user(sk->sk_sndbuf - sk_wmem_alloc_get(sk), + (int __user *)argp); + goto done; + case SIOCINQ: + { + struct sk_buff *skb; + int amount; + + if (sock->state != SS_CONNECTED) { + error = -EINVAL; + goto done; + } + spin_lock_irq(&sk->sk_receive_queue.lock); + skb = skb_peek(&sk->sk_receive_queue); + amount = skb ? skb->len : 0; + spin_unlock_irq(&sk->sk_receive_queue.lock); + error = put_user(amount, (int __user *)argp); + goto done; + } + case ATM_SETSC: + net_warn_ratelimited("ATM_SETSC is obsolete; used by %s:%d\n", + current->comm, task_pid_nr(current)); + error = 0; + goto done; + case ATM_SETBACKEND: + case ATM_NEWBACKENDIF: + { + atm_backend_t backend; + error = get_user(backend, (atm_backend_t __user *)argp); + if (error) + goto done; + switch (backend) { + case ATM_BACKEND_PPP: + request_module("pppoatm"); + break; + case ATM_BACKEND_BR2684: + request_module("br2684"); + break; + } + break; + } + } + + error = -ENOIOCTLCMD; + + mutex_lock(&ioctl_mutex); + list_for_each(pos, &ioctl_list) { + struct atm_ioctl *ic = list_entry(pos, struct atm_ioctl, list); + if (try_module_get(ic->owner)) { + error = ic->ioctl(sock, cmd, arg); + module_put(ic->owner); + if (error != -ENOIOCTLCMD) + break; + } + } + mutex_unlock(&ioctl_mutex); + + if (error != -ENOIOCTLCMD) + goto done; + + if (cmd == ATM_GETNAMES) { + if (IS_ENABLED(CONFIG_COMPAT) && compat) { +#ifdef CONFIG_COMPAT + struct compat_atm_iobuf __user *ciobuf = argp; + compat_uptr_t cbuf; + len = &ciobuf->length; + if (get_user(cbuf, &ciobuf->buffer)) + return -EFAULT; + buf = compat_ptr(cbuf); +#endif + } else { + struct atm_iobuf __user *iobuf = argp; + len = &iobuf->length; + if (get_user(buf, &iobuf->buffer)) + return -EFAULT; + } + error = atm_getnames(buf, len); + } else { + int number; + + if (IS_ENABLED(CONFIG_COMPAT) && compat) { +#ifdef CONFIG_COMPAT + struct compat_atmif_sioc __user *csioc = argp; + compat_uptr_t carg; + + len = &csioc->length; + if (get_user(carg, &csioc->arg)) + return -EFAULT; + buf = compat_ptr(carg); + if (get_user(number, &csioc->number)) + return -EFAULT; +#endif + } else { + struct atmif_sioc __user *sioc = argp; + + len = &sioc->length; + if (get_user(buf, &sioc->arg)) + return -EFAULT; + if (get_user(number, &sioc->number)) + return -EFAULT; + } + error = atm_dev_ioctl(cmd, buf, len, number, compat); + } + +done: + return error; +} + +int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) +{ + return do_vcc_ioctl(sock, cmd, arg, 0); +} + +#ifdef CONFIG_COMPAT +/* + * FIXME: + * The compat_ioctl handling is duplicated, using both these conversion + * routines and the compat argument to the actual handlers. Both + * versions are somewhat incomplete and should be merged, e.g. by + * moving the ioctl number translation into the actual handlers and + * killing the conversion code. + * + * -arnd, November 2009 + */ +#define ATM_GETLINKRATE32 _IOW('a', ATMIOC_ITF+1, struct compat_atmif_sioc) +#define ATM_GETNAMES32 _IOW('a', ATMIOC_ITF+3, struct compat_atm_iobuf) +#define ATM_GETTYPE32 _IOW('a', ATMIOC_ITF+4, struct compat_atmif_sioc) +#define ATM_GETESI32 _IOW('a', ATMIOC_ITF+5, struct compat_atmif_sioc) +#define ATM_GETCIRANGE32 _IOW('a', ATMIOC_ITF+10, struct compat_atmif_sioc) +#define ATM_SETCIRANGE32 _IOW('a', ATMIOC_ITF+11, struct compat_atmif_sioc) +#define ATM_SETESI32 _IOW('a', ATMIOC_ITF+12, struct compat_atmif_sioc) +#define ATM_SETESIF32 _IOW('a', ATMIOC_ITF+13, struct compat_atmif_sioc) +#define ATM_GETSTAT32 _IOW('a', ATMIOC_SARCOM+0, struct compat_atmif_sioc) +#define ATM_GETSTATZ32 _IOW('a', ATMIOC_SARCOM+1, struct compat_atmif_sioc) +#define ATM_GETLOOP32 _IOW('a', ATMIOC_SARCOM+2, struct compat_atmif_sioc) +#define ATM_SETLOOP32 _IOW('a', ATMIOC_SARCOM+3, struct compat_atmif_sioc) +#define ATM_QUERYLOOP32 _IOW('a', ATMIOC_SARCOM+4, struct compat_atmif_sioc) + +static struct { + unsigned int cmd32; + unsigned int cmd; +} atm_ioctl_map[] = { + { ATM_GETLINKRATE32, ATM_GETLINKRATE }, + { ATM_GETNAMES32, ATM_GETNAMES }, + { ATM_GETTYPE32, ATM_GETTYPE }, + { ATM_GETESI32, ATM_GETESI }, + { ATM_GETCIRANGE32, ATM_GETCIRANGE }, + { ATM_SETCIRANGE32, ATM_SETCIRANGE }, + { ATM_SETESI32, ATM_SETESI }, + { ATM_SETESIF32, ATM_SETESIF }, + { ATM_GETSTAT32, ATM_GETSTAT }, + { ATM_GETSTATZ32, ATM_GETSTATZ }, + { ATM_GETLOOP32, ATM_GETLOOP }, + { ATM_SETLOOP32, ATM_SETLOOP }, + { ATM_QUERYLOOP32, ATM_QUERYLOOP }, +}; + +#define NR_ATM_IOCTL ARRAY_SIZE(atm_ioctl_map) + +static int do_atm_iobuf(struct socket *sock, unsigned int cmd, + unsigned long arg) +{ + struct compat_atm_iobuf __user *iobuf32 = compat_ptr(arg); + u32 data; + + if (get_user(data, &iobuf32->buffer)) + return -EFAULT; + + return atm_getnames(&iobuf32->length, compat_ptr(data)); +} + +static int do_atmif_sioc(struct socket *sock, unsigned int cmd, + unsigned long arg) +{ + struct compat_atmif_sioc __user *sioc32 = compat_ptr(arg); + int number; + u32 data; + + if (get_user(data, &sioc32->arg) || get_user(number, &sioc32->number)) + return -EFAULT; + return atm_dev_ioctl(cmd, compat_ptr(data), &sioc32->length, number, 0); +} + +static int do_atm_ioctl(struct socket *sock, unsigned int cmd32, + unsigned long arg) +{ + int i; + unsigned int cmd = 0; + + for (i = 0; i < NR_ATM_IOCTL; i++) { + if (cmd32 == atm_ioctl_map[i].cmd32) { + cmd = atm_ioctl_map[i].cmd; + break; + } + } + if (i == NR_ATM_IOCTL) + return -EINVAL; + + switch (cmd) { + case ATM_GETNAMES: + return do_atm_iobuf(sock, cmd, arg); + + case ATM_GETLINKRATE: + case ATM_GETTYPE: + case ATM_GETESI: + case ATM_GETCIRANGE: + case ATM_SETCIRANGE: + case ATM_SETESI: + case ATM_SETESIF: + case ATM_GETSTAT: + case ATM_GETSTATZ: + case ATM_GETLOOP: + case ATM_SETLOOP: + case ATM_QUERYLOOP: + return do_atmif_sioc(sock, cmd, arg); + } + + return -EINVAL; +} + +int vcc_compat_ioctl(struct socket *sock, unsigned int cmd, + unsigned long arg) +{ + int ret; + + ret = do_vcc_ioctl(sock, cmd, arg, 1); + if (ret != -ENOIOCTLCMD) + return ret; + + return do_atm_ioctl(sock, cmd, arg); +} +#endif diff --git a/net/atm/pppoatm.c b/net/atm/pppoatm.c new file mode 100644 index 000000000..6da52d12d --- /dev/null +++ b/net/atm/pppoatm.c @@ -0,0 +1,490 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* net/atm/pppoatm.c - RFC2364 PPP over ATM/AAL5 */ + +/* Copyright 1999-2000 by Mitchell Blank Jr */ +/* Based on clip.c; 1995-1999 by Werner Almesberger, EPFL LRC/ICA */ +/* And on ppp_async.c; Copyright 1999 Paul Mackerras */ +/* And help from Jens Axboe */ + +/* + * + * This driver provides the encapsulation and framing for sending + * and receiving PPP frames in ATM AAL5 PDUs. + */ + +/* + * One shortcoming of this driver is that it does not comply with + * section 8 of RFC2364 - we are supposed to detect a change + * in encapsulation and immediately abort the connection (in order + * to avoid a black-hole being created if our peer loses state + * and changes encapsulation unilaterally. However, since the + * ppp_generic layer actually does the decapsulation, we need + * a way of notifying it when we _think_ there might be a problem) + * There's two cases: + * 1. LLC-encapsulation was missing when it was enabled. In + * this case, we should tell the upper layer "tear down + * this session if this skb looks ok to you" + * 2. LLC-encapsulation was present when it was disabled. Then + * we need to tell the upper layer "this packet may be + * ok, but if its in error tear down the session" + * These hooks are not yet available in ppp_generic + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/atm.h> +#include <linux/atmdev.h> +#include <linux/capability.h> +#include <linux/ppp_defs.h> +#include <linux/ppp-ioctl.h> +#include <linux/ppp_channel.h> +#include <linux/atmppp.h> + +#include "common.h" + +enum pppoatm_encaps { + e_autodetect = PPPOATM_ENCAPS_AUTODETECT, + e_vc = PPPOATM_ENCAPS_VC, + e_llc = PPPOATM_ENCAPS_LLC, +}; + +struct pppoatm_vcc { + struct atm_vcc *atmvcc; /* VCC descriptor */ + void (*old_push)(struct atm_vcc *, struct sk_buff *); + void (*old_pop)(struct atm_vcc *, struct sk_buff *); + void (*old_release_cb)(struct atm_vcc *); + struct module *old_owner; + /* keep old push/pop for detaching */ + enum pppoatm_encaps encaps; + atomic_t inflight; + unsigned long blocked; + int flags; /* SC_COMP_PROT - compress protocol */ + struct ppp_channel chan; /* interface to generic ppp layer */ + struct tasklet_struct wakeup_tasklet; +}; + +/* + * We want to allow two packets in the queue. The one that's currently in + * flight, and *one* queued up ready for the ATM device to send immediately + * from its TX done IRQ. We want to be able to use atomic_inc_not_zero(), so + * inflight == -2 represents an empty queue, -1 one packet, and zero means + * there are two packets in the queue. + */ +#define NONE_INFLIGHT -2 + +#define BLOCKED 0 + +/* + * Header used for LLC Encapsulated PPP (4 bytes) followed by the LCP protocol + * ID (0xC021) used in autodetection + */ +static const unsigned char pppllc[6] = { 0xFE, 0xFE, 0x03, 0xCF, 0xC0, 0x21 }; +#define LLC_LEN (4) + +static inline struct pppoatm_vcc *atmvcc_to_pvcc(const struct atm_vcc *atmvcc) +{ + return (struct pppoatm_vcc *) (atmvcc->user_back); +} + +static inline struct pppoatm_vcc *chan_to_pvcc(const struct ppp_channel *chan) +{ + return (struct pppoatm_vcc *) (chan->private); +} + +/* + * We can't do this directly from our _pop handler, since the ppp code + * doesn't want to be called in interrupt context, so we do it from + * a tasklet + */ +static void pppoatm_wakeup_sender(struct tasklet_struct *t) +{ + struct pppoatm_vcc *pvcc = from_tasklet(pvcc, t, wakeup_tasklet); + + ppp_output_wakeup(&pvcc->chan); +} + +static void pppoatm_release_cb(struct atm_vcc *atmvcc) +{ + struct pppoatm_vcc *pvcc = atmvcc_to_pvcc(atmvcc); + + /* + * As in pppoatm_pop(), it's safe to clear the BLOCKED bit here because + * the wakeup *can't* race with pppoatm_send(). They both hold the PPP + * channel's ->downl lock. And the potential race with *setting* it, + * which leads to the double-check dance in pppoatm_may_send(), doesn't + * exist here. In the sock_owned_by_user() case in pppoatm_send(), we + * set the BLOCKED bit while the socket is still locked. We know that + * ->release_cb() can't be called until that's done. + */ + if (test_and_clear_bit(BLOCKED, &pvcc->blocked)) + tasklet_schedule(&pvcc->wakeup_tasklet); + if (pvcc->old_release_cb) + pvcc->old_release_cb(atmvcc); +} +/* + * This gets called every time the ATM card has finished sending our + * skb. The ->old_pop will take care up normal atm flow control, + * but we also need to wake up the device if we blocked it + */ +static void pppoatm_pop(struct atm_vcc *atmvcc, struct sk_buff *skb) +{ + struct pppoatm_vcc *pvcc = atmvcc_to_pvcc(atmvcc); + + pvcc->old_pop(atmvcc, skb); + atomic_dec(&pvcc->inflight); + + /* + * We always used to run the wakeup tasklet unconditionally here, for + * fear of race conditions where we clear the BLOCKED flag just as we + * refuse another packet in pppoatm_send(). This was quite inefficient. + * + * In fact it's OK. The PPP core will only ever call pppoatm_send() + * while holding the channel->downl lock. And ppp_output_wakeup() as + * called by the tasklet will *also* grab that lock. So even if another + * CPU is in pppoatm_send() right now, the tasklet isn't going to race + * with it. The wakeup *will* happen after the other CPU is safely out + * of pppoatm_send() again. + * + * So if the CPU in pppoatm_send() has already set the BLOCKED bit and + * it about to return, that's fine. We trigger a wakeup which will + * happen later. And if the CPU in pppoatm_send() *hasn't* set the + * BLOCKED bit yet, that's fine too because of the double check in + * pppoatm_may_send() which is commented there. + */ + if (test_and_clear_bit(BLOCKED, &pvcc->blocked)) + tasklet_schedule(&pvcc->wakeup_tasklet); +} + +/* + * Unbind from PPP - currently we only do this when closing the socket, + * but we could put this into an ioctl if need be + */ +static void pppoatm_unassign_vcc(struct atm_vcc *atmvcc) +{ + struct pppoatm_vcc *pvcc; + pvcc = atmvcc_to_pvcc(atmvcc); + atmvcc->push = pvcc->old_push; + atmvcc->pop = pvcc->old_pop; + atmvcc->release_cb = pvcc->old_release_cb; + tasklet_kill(&pvcc->wakeup_tasklet); + ppp_unregister_channel(&pvcc->chan); + atmvcc->user_back = NULL; + kfree(pvcc); +} + +/* Called when an AAL5 PDU comes in */ +static void pppoatm_push(struct atm_vcc *atmvcc, struct sk_buff *skb) +{ + struct pppoatm_vcc *pvcc = atmvcc_to_pvcc(atmvcc); + pr_debug("\n"); + if (skb == NULL) { /* VCC was closed */ + struct module *module; + + pr_debug("removing ATMPPP VCC %p\n", pvcc); + module = pvcc->old_owner; + pppoatm_unassign_vcc(atmvcc); + atmvcc->push(atmvcc, NULL); /* Pass along bad news */ + module_put(module); + return; + } + atm_return(atmvcc, skb->truesize); + switch (pvcc->encaps) { + case e_llc: + if (skb->len < LLC_LEN || + memcmp(skb->data, pppllc, LLC_LEN)) + goto error; + skb_pull(skb, LLC_LEN); + break; + case e_autodetect: + if (pvcc->chan.ppp == NULL) { /* Not bound yet! */ + kfree_skb(skb); + return; + } + if (skb->len >= sizeof(pppllc) && + !memcmp(skb->data, pppllc, sizeof(pppllc))) { + pvcc->encaps = e_llc; + skb_pull(skb, LLC_LEN); + break; + } + if (skb->len >= (sizeof(pppllc) - LLC_LEN) && + !memcmp(skb->data, &pppllc[LLC_LEN], + sizeof(pppllc) - LLC_LEN)) { + pvcc->encaps = e_vc; + pvcc->chan.mtu += LLC_LEN; + break; + } + pr_debug("Couldn't autodetect yet (skb: %6ph)\n", skb->data); + goto error; + case e_vc: + break; + } + ppp_input(&pvcc->chan, skb); + return; + +error: + kfree_skb(skb); + ppp_input_error(&pvcc->chan); +} + +static int pppoatm_may_send(struct pppoatm_vcc *pvcc, int size) +{ + /* + * It's not clear that we need to bother with using atm_may_send() + * to check we don't exceed sk->sk_sndbuf. If userspace sets a + * value of sk_sndbuf which is lower than the MTU, we're going to + * block for ever. But the code always did that before we introduced + * the packet count limit, so... + */ + if (atm_may_send(pvcc->atmvcc, size) && + atomic_inc_not_zero(&pvcc->inflight)) + return 1; + + /* + * We use test_and_set_bit() rather than set_bit() here because + * we need to ensure there's a memory barrier after it. The bit + * *must* be set before we do the atomic_inc() on pvcc->inflight. + * There's no smp_mb__after_set_bit(), so it's this or abuse + * smp_mb__after_atomic(). + */ + test_and_set_bit(BLOCKED, &pvcc->blocked); + + /* + * We may have raced with pppoatm_pop(). If it ran for the + * last packet in the queue, *just* before we set the BLOCKED + * bit, then it might never run again and the channel could + * remain permanently blocked. Cope with that race by checking + * *again*. If it did run in that window, we'll have space on + * the queue now and can return success. It's harmless to leave + * the BLOCKED flag set, since it's only used as a trigger to + * run the wakeup tasklet. Another wakeup will never hurt. + * If pppoatm_pop() is running but hasn't got as far as making + * space on the queue yet, then it hasn't checked the BLOCKED + * flag yet either, so we're safe in that case too. It'll issue + * an "immediate" wakeup... where "immediate" actually involves + * taking the PPP channel's ->downl lock, which is held by the + * code path that calls pppoatm_send(), and is thus going to + * wait for us to finish. + */ + if (atm_may_send(pvcc->atmvcc, size) && + atomic_inc_not_zero(&pvcc->inflight)) + return 1; + + return 0; +} +/* + * Called by the ppp_generic.c to send a packet - returns true if packet + * was accepted. If we return false, then it's our job to call + * ppp_output_wakeup(chan) when we're feeling more up to it. + * Note that in the ENOMEM case (as opposed to the !atm_may_send case) + * we should really drop the packet, but the generic layer doesn't + * support this yet. We just return 'DROP_PACKET' which we actually define + * as success, just to be clear what we're really doing. + */ +#define DROP_PACKET 1 +static int pppoatm_send(struct ppp_channel *chan, struct sk_buff *skb) +{ + struct pppoatm_vcc *pvcc = chan_to_pvcc(chan); + struct atm_vcc *vcc; + int ret; + + ATM_SKB(skb)->vcc = pvcc->atmvcc; + pr_debug("(skb=0x%p, vcc=0x%p)\n", skb, pvcc->atmvcc); + if (skb->data[0] == '\0' && (pvcc->flags & SC_COMP_PROT)) + (void) skb_pull(skb, 1); + + vcc = ATM_SKB(skb)->vcc; + bh_lock_sock(sk_atm(vcc)); + if (sock_owned_by_user(sk_atm(vcc))) { + /* + * Needs to happen (and be flushed, hence test_and_) before we unlock + * the socket. It needs to be seen by the time our ->release_cb gets + * called. + */ + test_and_set_bit(BLOCKED, &pvcc->blocked); + goto nospace; + } + if (test_bit(ATM_VF_CLOSE, &vcc->flags) || + !test_bit(ATM_VF_READY, &vcc->flags)) { + bh_unlock_sock(sk_atm(vcc)); + kfree_skb(skb); + return DROP_PACKET; + } + + switch (pvcc->encaps) { /* LLC encapsulation needed */ + case e_llc: + if (skb_headroom(skb) < LLC_LEN) { + struct sk_buff *n; + n = skb_realloc_headroom(skb, LLC_LEN); + if (n != NULL && + !pppoatm_may_send(pvcc, n->truesize)) { + kfree_skb(n); + goto nospace; + } + consume_skb(skb); + skb = n; + if (skb == NULL) { + bh_unlock_sock(sk_atm(vcc)); + return DROP_PACKET; + } + } else if (!pppoatm_may_send(pvcc, skb->truesize)) + goto nospace; + memcpy(skb_push(skb, LLC_LEN), pppllc, LLC_LEN); + break; + case e_vc: + if (!pppoatm_may_send(pvcc, skb->truesize)) + goto nospace; + break; + case e_autodetect: + bh_unlock_sock(sk_atm(vcc)); + pr_debug("Trying to send without setting encaps!\n"); + kfree_skb(skb); + return 1; + } + + atm_account_tx(vcc, skb); + pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", + skb, ATM_SKB(skb)->vcc, ATM_SKB(skb)->vcc->dev); + ret = ATM_SKB(skb)->vcc->send(ATM_SKB(skb)->vcc, skb) + ? DROP_PACKET : 1; + bh_unlock_sock(sk_atm(vcc)); + return ret; +nospace: + bh_unlock_sock(sk_atm(vcc)); + /* + * We don't have space to send this SKB now, but we might have + * already applied SC_COMP_PROT compression, so may need to undo + */ + if ((pvcc->flags & SC_COMP_PROT) && skb_headroom(skb) > 0 && + skb->data[-1] == '\0') + (void) skb_push(skb, 1); + return 0; +} + +/* This handles ioctls sent to the /dev/ppp interface */ +static int pppoatm_devppp_ioctl(struct ppp_channel *chan, unsigned int cmd, + unsigned long arg) +{ + switch (cmd) { + case PPPIOCGFLAGS: + return put_user(chan_to_pvcc(chan)->flags, (int __user *) arg) + ? -EFAULT : 0; + case PPPIOCSFLAGS: + return get_user(chan_to_pvcc(chan)->flags, (int __user *) arg) + ? -EFAULT : 0; + } + return -ENOTTY; +} + +static const struct ppp_channel_ops pppoatm_ops = { + .start_xmit = pppoatm_send, + .ioctl = pppoatm_devppp_ioctl, +}; + +static int pppoatm_assign_vcc(struct atm_vcc *atmvcc, void __user *arg) +{ + struct atm_backend_ppp be; + struct pppoatm_vcc *pvcc; + int err; + + if (copy_from_user(&be, arg, sizeof be)) + return -EFAULT; + if (be.encaps != PPPOATM_ENCAPS_AUTODETECT && + be.encaps != PPPOATM_ENCAPS_VC && be.encaps != PPPOATM_ENCAPS_LLC) + return -EINVAL; + pvcc = kzalloc_obj(*pvcc); + if (pvcc == NULL) + return -ENOMEM; + pvcc->atmvcc = atmvcc; + + /* Maximum is zero, so that we can use atomic_inc_not_zero() */ + atomic_set(&pvcc->inflight, NONE_INFLIGHT); + pvcc->old_push = atmvcc->push; + pvcc->old_pop = atmvcc->pop; + pvcc->old_owner = atmvcc->owner; + pvcc->old_release_cb = atmvcc->release_cb; + pvcc->encaps = (enum pppoatm_encaps) be.encaps; + pvcc->chan.private = pvcc; + pvcc->chan.ops = &pppoatm_ops; + pvcc->chan.mtu = atmvcc->qos.txtp.max_sdu - PPP_HDRLEN - + (be.encaps == e_vc ? 0 : LLC_LEN); + tasklet_setup(&pvcc->wakeup_tasklet, pppoatm_wakeup_sender); + err = ppp_register_channel(&pvcc->chan); + if (err != 0) { + kfree(pvcc); + return err; + } + atmvcc->user_back = pvcc; + atmvcc->push = pppoatm_push; + atmvcc->pop = pppoatm_pop; + atmvcc->release_cb = pppoatm_release_cb; + __module_get(THIS_MODULE); + atmvcc->owner = THIS_MODULE; + + /* re-process everything received between connection setup and + backend setup */ + vcc_process_recv_queue(atmvcc); + return 0; +} + +/* + * This handles ioctls actually performed on our vcc - we must return + * -ENOIOCTLCMD for any unrecognized ioctl + */ +static int pppoatm_ioctl(struct socket *sock, unsigned int cmd, + unsigned long arg) +{ + struct atm_vcc *atmvcc = ATM_SD(sock); + void __user *argp = (void __user *)arg; + + if (cmd != ATM_SETBACKEND && atmvcc->push != pppoatm_push) + return -ENOIOCTLCMD; + switch (cmd) { + case ATM_SETBACKEND: { + atm_backend_t b; + if (get_user(b, (atm_backend_t __user *) argp)) + return -EFAULT; + if (b != ATM_BACKEND_PPP) + return -ENOIOCTLCMD; + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + if (sock->state != SS_CONNECTED) + return -EINVAL; + return pppoatm_assign_vcc(atmvcc, argp); + } + case PPPIOCGCHAN: + return put_user(ppp_channel_index(&atmvcc_to_pvcc(atmvcc)-> + chan), (int __user *) argp) ? -EFAULT : 0; + case PPPIOCGUNIT: + return put_user(ppp_unit_number(&atmvcc_to_pvcc(atmvcc)-> + chan), (int __user *) argp) ? -EFAULT : 0; + } + return -ENOIOCTLCMD; +} + +static struct atm_ioctl pppoatm_ioctl_ops = { + .owner = THIS_MODULE, + .ioctl = pppoatm_ioctl, +}; + +static int __init pppoatm_init(void) +{ + register_atm_ioctl(&pppoatm_ioctl_ops); + return 0; +} + +static void __exit pppoatm_exit(void) +{ + deregister_atm_ioctl(&pppoatm_ioctl_ops); +} + +module_init(pppoatm_init); +module_exit(pppoatm_exit); + +MODULE_AUTHOR("Mitchell Blank Jr <mitch@sfgoth.com>"); +MODULE_DESCRIPTION("RFC2364 PPP over ATM/AAL5"); +MODULE_LICENSE("GPL"); diff --git a/net/atm/proc.c b/net/atm/proc.c new file mode 100644 index 000000000..8f20b49b9 --- /dev/null +++ b/net/atm/proc.c @@ -0,0 +1,333 @@ +// SPDX-License-Identifier: GPL-2.0 +/* net/atm/proc.c - ATM /proc interface + * + * Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA + * + * seq_file api usage by romieu@fr.zoreil.com + * + * Evaluating the efficiency of the whole thing if left as an exercise to + * the reader. + */ + +#include <linux/module.h> /* for EXPORT_SYMBOL */ +#include <linux/string.h> +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/fs.h> +#include <linux/stat.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/errno.h> +#include <linux/atm.h> +#include <linux/atmdev.h> +#include <linux/netdevice.h> +#include <linux/init.h> /* for __init */ +#include <linux/slab.h> +#include <net/net_namespace.h> +#include <linux/uaccess.h> +#include <linux/param.h> /* for HZ */ +#include <linux/atomic.h> +#include "resources.h" +#include "common.h" /* atm_proc_init prototype */ + +static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, + size_t count, loff_t *pos); + +static const struct proc_ops atm_dev_proc_ops = { + .proc_read = proc_dev_atm_read, + .proc_lseek = noop_llseek, +}; + +static void add_stats(struct seq_file *seq, const char *aal, + const struct k_atm_aal_stats *stats) +{ + seq_printf(seq, "%s ( %d %d %d %d %d )", aal, + atomic_read(&stats->tx), atomic_read(&stats->tx_err), + atomic_read(&stats->rx), atomic_read(&stats->rx_err), + atomic_read(&stats->rx_drop)); +} + +static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev) +{ + int i; + + seq_printf(seq, "%3d %-8s", dev->number, dev->type); + for (i = 0; i < ESI_LEN; i++) + seq_printf(seq, "%02x", dev->esi[i]); + seq_puts(seq, " "); + add_stats(seq, "0", &dev->stats.aal0); + seq_puts(seq, " "); + add_stats(seq, "5", &dev->stats.aal5); + seq_printf(seq, "\t[%d]", refcount_read(&dev->refcnt)); + seq_putc(seq, '\n'); +} + +struct vcc_state { + int bucket; + struct sock *sk; +}; + +static inline int compare_family(struct sock *sk, int family) +{ + return !family || (sk->sk_family == family); +} + +static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l) +{ + struct sock *sk = *sock; + + if (sk == SEQ_START_TOKEN) { + for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) { + struct hlist_head *head = &vcc_hash[*bucket]; + + sk = hlist_empty(head) ? NULL : __sk_head(head); + if (sk) + break; + } + l--; + } +try_again: + for (; sk; sk = sk_next(sk)) { + l -= compare_family(sk, family); + if (l < 0) + goto out; + } + if (!sk && ++*bucket < VCC_HTABLE_SIZE) { + sk = sk_head(&vcc_hash[*bucket]); + goto try_again; + } + sk = SEQ_START_TOKEN; +out: + *sock = sk; + return (l < 0); +} + +static inline void *vcc_walk(struct seq_file *seq, loff_t l) +{ + struct vcc_state *state = seq->private; + int family = (uintptr_t)(pde_data(file_inode(seq->file))); + + return __vcc_walk(&state->sk, family, &state->bucket, l) ? + state : NULL; +} + +static void *vcc_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(vcc_sklist_lock) +{ + struct vcc_state *state = seq->private; + loff_t left = *pos; + + read_lock(&vcc_sklist_lock); + state->sk = SEQ_START_TOKEN; + return left ? vcc_walk(seq, left) : SEQ_START_TOKEN; +} + +static void vcc_seq_stop(struct seq_file *seq, void *v) + __releases(vcc_sklist_lock) +{ + read_unlock(&vcc_sklist_lock); +} + +static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + v = vcc_walk(seq, 1); + (*pos)++; + return v; +} + +static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc) +{ + static const char *const class_name[] = { + "off", "UBR", "CBR", "VBR", "ABR"}; + static const char *const aal_name[] = { + "---", "1", "2", "3/4", /* 0- 3 */ + "???", "5", "???", "???", /* 4- 7 */ + "???", "???", "???", "???", /* 8-11 */ + "???", "0", "???", "???"}; /* 12-15 */ + + seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s", + vcc->dev->number, vcc->vpi, vcc->vci, + vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" : + aal_name[vcc->qos.aal], vcc->qos.rxtp.min_pcr, + class_name[vcc->qos.rxtp.traffic_class], + vcc->qos.txtp.min_pcr, + class_name[vcc->qos.txtp.traffic_class]); + seq_putc(seq, '\n'); +} + +static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc) +{ + struct sock *sk = sk_atm(vcc); + + seq_printf(seq, "%pK ", vcc); + if (!vcc->dev) + seq_printf(seq, "Unassigned "); + else + seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi, + vcc->vci); + switch (sk->sk_family) { + case AF_ATMPVC: + seq_printf(seq, "PVC"); + break; + default: + seq_printf(seq, "%3d", sk->sk_family); + } + seq_printf(seq, " %04lx %5d %7d/%7d %7d/%7d [%d]\n", + vcc->flags, sk->sk_err, + sk_wmem_alloc_get(sk), sk->sk_sndbuf, + sk_rmem_alloc_get(sk), sk->sk_rcvbuf, + refcount_read(&sk->sk_refcnt)); +} + +static int atm_dev_seq_show(struct seq_file *seq, void *v) +{ + static char atm_dev_banner[] = + "Itf Type ESI/\"MAC\"addr " + "AAL(TX,err,RX,err,drop) ... [refcnt]\n"; + + if (v == &atm_devs) + seq_puts(seq, atm_dev_banner); + else { + struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list); + + atm_dev_info(seq, dev); + } + return 0; +} + +static const struct seq_operations atm_dev_seq_ops = { + .start = atm_dev_seq_start, + .next = atm_dev_seq_next, + .stop = atm_dev_seq_stop, + .show = atm_dev_seq_show, +}; + +static int pvc_seq_show(struct seq_file *seq, void *v) +{ + static char atm_pvc_banner[] = + "Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n"; + + if (v == SEQ_START_TOKEN) + seq_puts(seq, atm_pvc_banner); + else { + struct vcc_state *state = seq->private; + struct atm_vcc *vcc = atm_sk(state->sk); + + pvc_info(seq, vcc); + } + return 0; +} + +static const struct seq_operations pvc_seq_ops = { + .start = vcc_seq_start, + .next = vcc_seq_next, + .stop = vcc_seq_stop, + .show = pvc_seq_show, +}; + +static int vcc_seq_show(struct seq_file *seq, void *v) +{ + if (v == SEQ_START_TOKEN) { + seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s", + "Address ", "Itf VPI VCI Fam Flags Reply " + "Send buffer Recv buffer [refcnt]\n"); + } else { + struct vcc_state *state = seq->private; + struct atm_vcc *vcc = atm_sk(state->sk); + + vcc_info(seq, vcc); + } + return 0; +} + +static const struct seq_operations vcc_seq_ops = { + .start = vcc_seq_start, + .next = vcc_seq_next, + .stop = vcc_seq_stop, + .show = vcc_seq_show, +}; + +static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, + size_t count, loff_t *pos) +{ + struct atm_dev *dev; + unsigned long page; + int length; + + if (count == 0) + return 0; + page = get_zeroed_page(GFP_KERNEL); + if (!page) + return -ENOMEM; + dev = pde_data(file_inode(file)); + if (!dev->ops->proc_read) + length = -EINVAL; + else { + length = dev->ops->proc_read(dev, pos, (char *)page); + if (length > count) + length = -EINVAL; + } + if (length >= 0) { + if (copy_to_user(buf, (char *)page, length)) + length = -EFAULT; + (*pos)++; + } + free_page(page); + return length; +} + +struct proc_dir_entry *atm_proc_root; +EXPORT_SYMBOL(atm_proc_root); + + +int atm_proc_dev_register(struct atm_dev *dev) +{ + int error; + + /* No proc info */ + if (!dev->ops->proc_read) + return 0; + + error = -ENOMEM; + dev->proc_name = kasprintf(GFP_KERNEL, "%s:%d", dev->type, dev->number); + if (!dev->proc_name) + goto err_out; + + dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root, + &atm_dev_proc_ops, dev); + if (!dev->proc_entry) + goto err_free_name; + return 0; + +err_free_name: + kfree(dev->proc_name); +err_out: + return error; +} + +void atm_proc_dev_deregister(struct atm_dev *dev) +{ + if (!dev->ops->proc_read) + return; + + remove_proc_entry(dev->proc_name, atm_proc_root); + kfree(dev->proc_name); +} + +int __init atm_proc_init(void) +{ + atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net); + if (!atm_proc_root) + return -ENOMEM; + proc_create_seq("devices", 0444, atm_proc_root, &atm_dev_seq_ops); + proc_create_seq_private("pvc", 0444, atm_proc_root, &pvc_seq_ops, + sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMPVC); + proc_create_seq_private("vc", 0444, atm_proc_root, &vcc_seq_ops, + sizeof(struct vcc_state), NULL); + return 0; +} + +void atm_proc_exit(void) +{ + remove_proc_subtree("atm", init_net.proc_net); +} diff --git a/net/atm/protocols.h b/net/atm/protocols.h new file mode 100644 index 000000000..30158efb5 --- /dev/null +++ b/net/atm/protocols.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* net/atm/protocols.h - ATM protocol handler entry points */ + +/* Written 1995-1997 by Werner Almesberger, EPFL LRC */ + + +#ifndef NET_ATM_PROTOCOLS_H +#define NET_ATM_PROTOCOLS_H + +int atm_init_aal0(struct atm_vcc *vcc); /* "raw" AAL0 */ +int atm_init_aal5(struct atm_vcc *vcc); /* "raw" AAL5 transport */ + +#endif diff --git a/net/atm/pvc.c b/net/atm/pvc.c new file mode 100644 index 000000000..8b2c3e515 --- /dev/null +++ b/net/atm/pvc.c @@ -0,0 +1,162 @@ +// SPDX-License-Identifier: GPL-2.0 +/* net/atm/pvc.c - ATM PVC sockets */ + +/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ + + +#include <linux/net.h> /* struct socket, struct proto_ops */ +#include <linux/atm.h> /* ATM stuff */ +#include <linux/atmdev.h> /* ATM devices */ +#include <linux/errno.h> /* error codes */ +#include <linux/kernel.h> /* printk */ +#include <linux/init.h> +#include <linux/skbuff.h> +#include <linux/bitops.h> +#include <linux/export.h> +#include <net/sock.h> /* for sock_no_* */ + +#include "resources.h" /* devs and vccs */ +#include "common.h" /* common for PVCs and SVCs */ + + +static int pvc_shutdown(struct socket *sock, int how) +{ + return 0; +} + +static int pvc_bind(struct socket *sock, struct sockaddr_unsized *sockaddr, + int sockaddr_len) +{ + struct sock *sk = sock->sk; + struct sockaddr_atmpvc *addr; + struct atm_vcc *vcc; + int error; + + if (sockaddr_len != sizeof(struct sockaddr_atmpvc)) + return -EINVAL; + addr = (struct sockaddr_atmpvc *)sockaddr; + if (addr->sap_family != AF_ATMPVC) + return -EAFNOSUPPORT; + lock_sock(sk); + vcc = ATM_SD(sock); + if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) { + error = -EBADFD; + goto out; + } + if (test_bit(ATM_VF_PARTIAL, &vcc->flags)) { + if (vcc->vpi != ATM_VPI_UNSPEC) + addr->sap_addr.vpi = vcc->vpi; + if (vcc->vci != ATM_VCI_UNSPEC) + addr->sap_addr.vci = vcc->vci; + } + error = vcc_connect(sock, addr->sap_addr.itf, addr->sap_addr.vpi, + addr->sap_addr.vci); +out: + release_sock(sk); + return error; +} + +static int pvc_connect(struct socket *sock, struct sockaddr_unsized *sockaddr, + int sockaddr_len, int flags) +{ + return pvc_bind(sock, sockaddr, sockaddr_len); +} + +static int pvc_setsockopt(struct socket *sock, int level, int optname, + sockptr_t optval, unsigned int optlen) +{ + struct sock *sk = sock->sk; + int error; + + lock_sock(sk); + error = vcc_setsockopt(sock, level, optname, optval, optlen); + release_sock(sk); + return error; +} + +static int pvc_getsockopt(struct socket *sock, int level, int optname, + sockopt_t *opt) +{ + struct sock *sk = sock->sk; + int error; + + lock_sock(sk); + error = vcc_getsockopt(sock, level, optname, opt); + release_sock(sk); + return error; +} + +static int pvc_getname(struct socket *sock, struct sockaddr *sockaddr, + int peer) +{ + struct sockaddr_atmpvc *addr; + struct atm_vcc *vcc = ATM_SD(sock); + + if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags)) + return -ENOTCONN; + addr = (struct sockaddr_atmpvc *)sockaddr; + memset(addr, 0, sizeof(*addr)); + addr->sap_family = AF_ATMPVC; + addr->sap_addr.itf = vcc->dev->number; + addr->sap_addr.vpi = vcc->vpi; + addr->sap_addr.vci = vcc->vci; + return sizeof(struct sockaddr_atmpvc); +} + +static const struct proto_ops pvc_proto_ops = { + .family = PF_ATMPVC, + .owner = THIS_MODULE, + + .release = vcc_release, + .bind = pvc_bind, + .connect = pvc_connect, + .socketpair = sock_no_socketpair, + .accept = sock_no_accept, + .getname = pvc_getname, + .poll = vcc_poll, + .ioctl = vcc_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = vcc_compat_ioctl, +#endif + .gettstamp = sock_gettstamp, + .listen = sock_no_listen, + .shutdown = pvc_shutdown, + .setsockopt = pvc_setsockopt, + .getsockopt_iter = pvc_getsockopt, + .sendmsg = vcc_sendmsg, + .recvmsg = vcc_recvmsg, + .mmap = sock_no_mmap, +}; + + +static int pvc_create(struct net *net, struct socket *sock, int protocol, + int kern) +{ + if (net != &init_net) + return -EAFNOSUPPORT; + + sock->ops = &pvc_proto_ops; + return vcc_create(net, sock, protocol, PF_ATMPVC, kern); +} + +static const struct net_proto_family pvc_family_ops = { + .family = PF_ATMPVC, + .create = pvc_create, + .owner = THIS_MODULE, +}; + + +/* + * Initialize the ATM PVC protocol family + */ + + +int __init atmpvc_init(void) +{ + return sock_register(&pvc_family_ops); +} + +void atmpvc_exit(void) +{ + sock_unregister(PF_ATMPVC); +} diff --git a/net/atm/raw.c b/net/atm/raw.c new file mode 100644 index 000000000..87d136c75 --- /dev/null +++ b/net/atm/raw.c @@ -0,0 +1,75 @@ +// SPDX-License-Identifier: GPL-2.0 +/* net/atm/raw.c - Raw AAL0 and AAL5 transports */ + +/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ + +#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ + +#include <linux/module.h> +#include <linux/atmdev.h> +#include <linux/capability.h> +#include <linux/kernel.h> +#include <linux/skbuff.h> +#include <linux/mm.h> +#include <linux/slab.h> + +#include "common.h" +#include "protocols.h" + +/* + * SKB == NULL indicates that the link is being closed + */ + +static void atm_push_raw(struct atm_vcc *vcc, struct sk_buff *skb) +{ + if (skb) { + struct sock *sk = sk_atm(vcc); + + skb_queue_tail(&sk->sk_receive_queue, skb); + sk->sk_data_ready(sk); + } +} + +static void atm_pop_raw(struct atm_vcc *vcc, struct sk_buff *skb) +{ + struct sock *sk = sk_atm(vcc); + + pr_debug("(%d) %d -= %d\n", + vcc->vci, sk_wmem_alloc_get(sk), ATM_SKB(skb)->acct_truesize); + atm_return_tx(vcc, skb); + dev_kfree_skb_any(skb); + sk->sk_write_space(sk); +} + +static int atm_send_aal0(struct atm_vcc *vcc, struct sk_buff *skb) +{ + /* + * Note that if vpi/vci are _ANY or _UNSPEC the below will + * still work + */ + if (!capable(CAP_NET_ADMIN) && + (((u32 *)skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) != + ((vcc->vpi << ATM_HDR_VPI_SHIFT) | + (vcc->vci << ATM_HDR_VCI_SHIFT))) { + kfree_skb(skb); + return -EADDRNOTAVAIL; + } + return vcc->dev->ops->send(vcc, skb); +} + +int atm_init_aal0(struct atm_vcc *vcc) +{ + vcc->push = atm_push_raw; + vcc->pop = atm_pop_raw; + vcc->send = atm_send_aal0; + return 0; +} + +int atm_init_aal5(struct atm_vcc *vcc) +{ + vcc->push = atm_push_raw; + vcc->pop = atm_pop_raw; + vcc->send = vcc->dev->ops->send; + return 0; +} +EXPORT_SYMBOL(atm_init_aal5); diff --git a/net/atm/resources.c b/net/atm/resources.c new file mode 100644 index 000000000..d94dc8221 --- /dev/null +++ b/net/atm/resources.c @@ -0,0 +1,363 @@ +// SPDX-License-Identifier: GPL-2.0 +/* net/atm/resources.c - Statically allocated resources */ + +/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ + +/* Fixes + * Arnaldo Carvalho de Melo <acme@conectiva.com.br> + * 2002/01 - don't free the whole struct sock on sk->destruct time, + * use the default destruct function initialized by sock_init_data */ + +#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ + +#include <linux/ctype.h> +#include <linux/string.h> +#include <linux/atmdev.h> +#include <linux/kernel.h> /* for barrier */ +#include <linux/module.h> +#include <linux/bitops.h> +#include <linux/capability.h> +#include <linux/delay.h> +#include <linux/mutex.h> +#include <linux/slab.h> + +#include <net/sock.h> /* for struct sock */ + +#include "common.h" +#include "resources.h" + + +LIST_HEAD(atm_devs); +DEFINE_MUTEX(atm_dev_mutex); + +static struct atm_dev *__alloc_atm_dev(const char *type) +{ + struct atm_dev *dev; + + dev = kzalloc_obj(*dev); + if (!dev) + return NULL; + dev->type = type; + dev->signal = ATM_PHY_SIG_UNKNOWN; + dev->link_rate = ATM_OC3_PCR; + + return dev; +} + +static struct atm_dev *__atm_dev_lookup(int number) +{ + struct atm_dev *dev; + + list_for_each_entry(dev, &atm_devs, dev_list) { + if (dev->number == number) { + atm_dev_hold(dev); + return dev; + } + } + return NULL; +} + +struct atm_dev *atm_dev_lookup(int number) +{ + struct atm_dev *dev; + + mutex_lock(&atm_dev_mutex); + dev = __atm_dev_lookup(number); + mutex_unlock(&atm_dev_mutex); + return dev; +} +EXPORT_SYMBOL(atm_dev_lookup); + +struct atm_dev *atm_dev_register(const char *type, struct device *parent, + const struct atmdev_ops *ops, int number, + unsigned long *flags) +{ + struct atm_dev *dev, *inuse; + + dev = __alloc_atm_dev(type); + if (!dev) { + pr_err("no space for dev %s\n", type); + return NULL; + } + mutex_lock(&atm_dev_mutex); + if (number != -1) { + inuse = __atm_dev_lookup(number); + if (inuse) { + atm_dev_put(inuse); + mutex_unlock(&atm_dev_mutex); + kfree(dev); + return NULL; + } + dev->number = number; + } else { + dev->number = 0; + while ((inuse = __atm_dev_lookup(dev->number))) { + atm_dev_put(inuse); + dev->number++; + } + } + + dev->ops = ops; + if (flags) + dev->flags = *flags; + else + memset(&dev->flags, 0, sizeof(dev->flags)); + memset(&dev->stats, 0, sizeof(dev->stats)); + refcount_set(&dev->refcnt, 1); + + if (atm_proc_dev_register(dev) < 0) { + pr_err("atm_proc_dev_register failed for dev %s\n", type); + mutex_unlock(&atm_dev_mutex); + kfree(dev); + return NULL; + } + + if (atm_register_sysfs(dev, parent) < 0) { + pr_err("atm_register_sysfs failed for dev %s\n", type); + atm_proc_dev_deregister(dev); + goto out_fail; + } + + list_add_tail(&dev->dev_list, &atm_devs); + +out: + mutex_unlock(&atm_dev_mutex); + return dev; + +out_fail: + put_device(&dev->class_dev); + dev = NULL; + goto out; +} +EXPORT_SYMBOL(atm_dev_register); + +void atm_dev_deregister(struct atm_dev *dev) +{ + BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags)); + set_bit(ATM_DF_REMOVED, &dev->flags); + + /* + * if we remove current device from atm_devs list, new device + * with same number can appear, such we need deregister proc, + * release async all vccs and remove them from vccs list too + */ + mutex_lock(&atm_dev_mutex); + list_del(&dev->dev_list); + atm_dev_release_vccs(dev); + atm_unregister_sysfs(dev); + atm_proc_dev_deregister(dev); + mutex_unlock(&atm_dev_mutex); + + atm_dev_put(dev); +} +EXPORT_SYMBOL(atm_dev_deregister); + +static void copy_aal_stats(struct k_atm_aal_stats *from, + struct atm_aal_stats *to) +{ +#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i) + __AAL_STAT_ITEMS +#undef __HANDLE_ITEM +} + +static void subtract_aal_stats(struct k_atm_aal_stats *from, + struct atm_aal_stats *to) +{ +#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i) + __AAL_STAT_ITEMS +#undef __HANDLE_ITEM +} + +static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, + int zero) +{ + struct atm_dev_stats tmp; + int error = 0; + + copy_aal_stats(&dev->stats.aal0, &tmp.aal0); + copy_aal_stats(&dev->stats.aal34, &tmp.aal34); + copy_aal_stats(&dev->stats.aal5, &tmp.aal5); + if (arg) + error = copy_to_user(arg, &tmp, sizeof(tmp)); + if (zero && !error) { + subtract_aal_stats(&dev->stats.aal0, &tmp.aal0); + subtract_aal_stats(&dev->stats.aal34, &tmp.aal34); + subtract_aal_stats(&dev->stats.aal5, &tmp.aal5); + } + return error ? -EFAULT : 0; +} + +int atm_getnames(void __user *buf, int __user *iobuf_len) +{ + int error, len, size = 0; + struct atm_dev *dev; + struct list_head *p; + int *tmp_buf, *tmp_p; + + if (get_user(len, iobuf_len)) + return -EFAULT; + mutex_lock(&atm_dev_mutex); + list_for_each(p, &atm_devs) + size += sizeof(int); + if (size > len) { + mutex_unlock(&atm_dev_mutex); + return -E2BIG; + } + tmp_buf = kmalloc(size, GFP_ATOMIC); + if (!tmp_buf) { + mutex_unlock(&atm_dev_mutex); + return -ENOMEM; + } + tmp_p = tmp_buf; + list_for_each_entry(dev, &atm_devs, dev_list) { + *tmp_p++ = dev->number; + } + mutex_unlock(&atm_dev_mutex); + error = ((copy_to_user(buf, tmp_buf, size)) || + put_user(size, iobuf_len)) + ? -EFAULT : 0; + kfree(tmp_buf); + return error; +} + +int atm_dev_ioctl(unsigned int cmd, void __user *buf, int __user *sioc_len, + int number, int compat) +{ + struct atm_dev *dev; + int error, size = 0; + + dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d", + number); + if (!dev) + return -ENODEV; + + switch (cmd) { + case ATM_GETTYPE: + size = strlen(dev->type) + 1; + if (copy_to_user(buf, dev->type, size)) { + error = -EFAULT; + goto done; + } + break; + case ATM_GETESI: + size = ESI_LEN; + if (copy_to_user(buf, dev->esi, size)) { + error = -EFAULT; + goto done; + } + break; + case ATM_SETESI: + { + int i; + + for (i = 0; i < ESI_LEN; i++) + if (dev->esi[i]) { + error = -EEXIST; + goto done; + } + } + fallthrough; + case ATM_SETESIF: + { + unsigned char esi[ESI_LEN]; + + if (!capable(CAP_NET_ADMIN)) { + error = -EPERM; + goto done; + } + if (copy_from_user(esi, buf, ESI_LEN)) { + error = -EFAULT; + goto done; + } + memcpy(dev->esi, esi, ESI_LEN); + error = ESI_LEN; + goto done; + } + case ATM_GETSTATZ: + if (!capable(CAP_NET_ADMIN)) { + error = -EPERM; + goto done; + } + fallthrough; + case ATM_GETSTAT: + size = sizeof(struct atm_dev_stats); + error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ); + if (error) + goto done; + break; + case ATM_GETCIRANGE: + size = sizeof(struct atm_cirange); + if (copy_to_user(buf, &dev->ci_range, size)) { + error = -EFAULT; + goto done; + } + break; + case ATM_GETLINKRATE: + size = sizeof(int); + if (copy_to_user(buf, &dev->link_rate, size)) { + error = -EFAULT; + goto done; + } + break; + case ATM_SETLOOP: + if (__ATM_LM_XTRMT((int) (unsigned long) buf) && + __ATM_LM_XTLOC((int) (unsigned long) buf) > + __ATM_LM_XTRMT((int) (unsigned long) buf)) { + error = -EINVAL; + goto done; + } + fallthrough; + case ATM_SETCIRANGE: + if (!capable(CAP_NET_ADMIN)) { + error = -EPERM; + goto done; + } + fallthrough; + default: + if (IS_ENABLED(CONFIG_COMPAT) && compat) { +#ifdef CONFIG_COMPAT + if (!dev->ops->compat_ioctl) { + error = -EINVAL; + goto done; + } + size = dev->ops->compat_ioctl(dev, cmd, buf); +#endif + } else { + if (!dev->ops->ioctl) { + error = -EINVAL; + goto done; + } + size = dev->ops->ioctl(dev, cmd, buf); + } + if (size < 0) { + error = (size == -ENOIOCTLCMD ? -ENOTTY : size); + goto done; + } + } + + if (size) + error = put_user(size, sioc_len) ? -EFAULT : 0; + else + error = 0; +done: + atm_dev_put(dev); + return error; +} + +#ifdef CONFIG_PROC_FS +void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos) +{ + mutex_lock(&atm_dev_mutex); + return seq_list_start_head(&atm_devs, *pos); +} + +void atm_dev_seq_stop(struct seq_file *seq, void *v) +{ + mutex_unlock(&atm_dev_mutex); +} + +void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + return seq_list_next(v, &atm_devs, pos); +} +#endif diff --git a/net/atm/resources.h b/net/atm/resources.h new file mode 100644 index 000000000..4a0839e92 --- /dev/null +++ b/net/atm/resources.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* net/atm/resources.h - ATM-related resources */ + +/* Written 1995-1998 by Werner Almesberger, EPFL LRC/ICA */ + + +#ifndef NET_ATM_RESOURCES_H +#define NET_ATM_RESOURCES_H + +#include <linux/atmdev.h> +#include <linux/mutex.h> + + +extern struct list_head atm_devs; +extern struct mutex atm_dev_mutex; + +int atm_getnames(void __user *buf, int __user *iobuf_len); +int atm_dev_ioctl(unsigned int cmd, void __user *buf, int __user *sioc_len, + int number, int compat); + +#ifdef CONFIG_PROC_FS + +#include <linux/proc_fs.h> + +void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos); +void atm_dev_seq_stop(struct seq_file *seq, void *v); +void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); + + +int atm_proc_dev_register(struct atm_dev *dev); +void atm_proc_dev_deregister(struct atm_dev *dev); + +#else + +static inline int atm_proc_dev_register(struct atm_dev *dev) +{ + return 0; +} + +static inline void atm_proc_dev_deregister(struct atm_dev *dev) +{ + /* nothing */ +} + +#endif /* CONFIG_PROC_FS */ + +int atm_register_sysfs(struct atm_dev *adev, struct device *parent); +void atm_unregister_sysfs(struct atm_dev *adev); +#endif |