diff options
Diffstat (limited to 'net/atm/br2684.c')
| -rw-r--r-- | net/atm/br2684.c | 872 |
1 files changed, 872 insertions, 0 deletions
diff --git a/net/atm/br2684.c b/net/atm/br2684.c new file mode 100644 index 000000000..f666f2f98 --- /dev/null +++ b/net/atm/br2684.c @@ -0,0 +1,872 @@ +// 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_RELEASED, &atmvcc->flags) || + 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(sizeof(struct br2684_vcc), GFP_KERNEL); + 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"); |