| /* |
| * 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 |
| */ |
| |
| #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 <asm/uaccess.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" |
| |
| #ifdef SKB_DEBUG |
| static void skb_debug(const struct sk_buff *skb) |
| { |
| #define NUM2PRINT 50 |
| char buf[NUM2PRINT * 3 + 1]; /* 3 chars per byte */ |
| int i = 0; |
| for (i = 0; i < skb->len && i < NUM2PRINT; i++) { |
| sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]); |
| } |
| printk(KERN_DEBUG "br2684: skb: %s\n", buf); |
| } |
| #else |
| #define skb_debug(skb) do {} while (0) |
| #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 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); |
| enum br2684_encaps encaps; |
| struct list_head brvccs; |
| #ifdef CONFIG_ATM_BR2684_IPFILTER |
| struct br2684_filter filter; |
| #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
| unsigned copies_needed, copies_failed; |
| }; |
| |
| 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 interrupt 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 (struct br2684_dev *)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; |
| } |
| |
| /* 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); |
| struct net_device *net_dev = skb->dev; |
| |
| pr_debug("br2684_pop(vcc %p ; net_dev %p )\n", vcc, net_dev); |
| brvcc->old_pop(vcc, skb); |
| |
| if (!net_dev) |
| return; |
| |
| if (atm_may_send(vcc, 0)) |
| netif_wake_queue(net_dev); |
| |
| } |
| /* |
| * 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) ? 10 : 2; |
| |
| 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); |
| atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); |
| ATM_SKB(skb)->atm_options = atmvcc->atm_options; |
| dev->stats.tx_packets++; |
| dev->stats.tx_bytes += skb->len; |
| atmvcc->send(atmvcc, skb); |
| |
| if (!atm_may_send(atmvcc, 0)) { |
| netif_stop_queue(brvcc->device); |
| /*check for race with br2684_pop*/ |
| if (atm_may_send(atmvcc, 0)) |
| netif_start_queue(brvcc->device); |
| } |
| |
| return 1; |
| } |
| |
| 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; |
| |
| pr_debug("br2684_start_xmit, 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); |
| read_unlock(&devs_lock); |
| return NETDEV_TX_OK; |
| } |
| 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++; |
| } |
| read_unlock(&devs_lock); |
| return NETDEV_TX_OK; |
| } |
| |
| /* |
| * 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->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ |
| kfree(brvcc); |
| module_put(THIS_MODULE); |
| } |
| |
| /* 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("br2684_push\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 (*((u16 *) (skb->data)) != 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); |
| return; |
| } |
| |
| /* |
| * 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 sk_buff_head queue; |
| int err; |
| struct br2684_vcc *brvcc; |
| struct sk_buff *skb, *tmp; |
| struct sk_buff_head *rq; |
| struct br2684_dev *brdev; |
| struct net_device *net_dev; |
| struct atm_backend_br2684 be; |
| unsigned long flags; |
| |
| if (copy_from_user(&be, arg, sizeof be)) |
| return -EFAULT; |
| brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); |
| if (!brvcc) |
| return -ENOMEM; |
| write_lock_irq(&devs_lock); |
| net_dev = br2684_find_dev(&be.ifspec); |
| if (net_dev == NULL) { |
| printk(KERN_ERR |
| "br2684: tried to attach to non-existant 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("br2684_regvcc 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; |
| if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) |
| memcpy(net_dev->dev_addr, esi, net_dev->addr_len); |
| else |
| net_dev->dev_addr[2] = 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; |
| barrier(); |
| atmvcc->push = br2684_push; |
| atmvcc->pop = br2684_pop; |
| |
| __skb_queue_head_init(&queue); |
| rq = &sk_atm(atmvcc)->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) { |
| struct net_device *dev; |
| |
| br2684_push(atmvcc, skb); |
| dev = skb->dev; |
| |
| dev->stats.rx_bytes -= skb->len; |
| dev->stats.rx_packets--; |
| } |
| __module_get(THIS_MODULE); |
| 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_change_mtu = eth_change_mtu, |
| .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, |
| .ndo_change_mtu = eth_change_mtu |
| }; |
| |
| static void br2684_setup(struct net_device *netdev) |
| { |
| struct br2684_dev *brdev = BRPRIV(netdev); |
| |
| ether_setup(netdev); |
| 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 = 0; |
| netdev->netdev_ops = &br2684_netdev_ops_routed; |
| netdev->addr_len = 0; |
| netdev->mtu = 1500; |
| 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("br2684_create\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", |
| (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) { |
| printk(KERN_ERR "br2684_create: register_netdev failed\n"); |
| free_netdev(netdev); |
| return err; |
| } |
| |
| write_lock_irq(&devs_lock); |
| brdev->payload = payload; |
| brdev->number = list_empty(&br2684_devs) ? 1 : |
| 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) |
| 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 |
| #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte] |
| #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3) |
| if (brvcc->filter.netmask != 0) |
| seq_printf(seq, " filter=%d.%d.%d.%d/" |
| "%d.%d.%d.%d\n", bs(prefix), bs(netmask)); |
| #undef bs |
| #undef b1 |
| #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, |
| }; |
| |
| static int br2684_proc_open(struct inode *inode, struct file *file) |
| { |
| return seq_open(file, &br2684_seq_ops); |
| } |
| |
| static const struct file_operations br2684_proc_ops = { |
| .owner = THIS_MODULE, |
| .open = br2684_proc_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| |
| 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("br2684", 0, atm_proc_root, &br2684_proc_ops); |
| if (p == NULL) |
| return -ENOMEM; |
| #endif |
| register_atm_ioctl(&br2684_ioctl_ops); |
| 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 |
| |
| 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"); |