| /* |
| Experimental ethernet netdevice using ATM AAL5 as underlying carrier |
| (RFC1483 obsoleted by RFC2684) for Linux 2.4 |
| Author: Marcell GAL, 2000, XDSL Ltd, Hungary |
| */ |
| |
| #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" |
| |
| /* |
| * Define this to use a version of the code which interacts with the higher |
| * layers in a more intellegent way, by always reserving enough space for |
| * our header at the begining of the packet. However, there may still be |
| * some problems with programs like tcpdump. In 2.5 we'll sort out what |
| * we need to do to get this perfect. For now we just will copy the packet |
| * if we need space for the header |
| */ |
| /* #define FASTER_VERSION */ |
| |
| #ifdef DEBUG |
| #define DPRINTK(format, args...) printk(KERN_DEBUG "br2684: " format, ##args) |
| #else |
| #define DPRINTK(format, args...) |
| #endif |
| |
| #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 |
| |
| static unsigned char llc_oui_pid_pad[] = |
| { 0xAA, 0xAA, 0x03, 0x00, 0x80, 0xC2, 0x00, 0x07, 0x00, 0x00 }; |
| #define PADLEN (2) |
| |
| 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 */ |
| #ifndef FASTER_VERSION |
| unsigned copies_needed, copies_failed; |
| #endif /* FASTER_VERSION */ |
| }; |
| |
| 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) */ |
| struct net_device_stats stats; |
| int mac_was_set; |
| }; |
| |
| /* |
| * 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 *) net_dev->priv; |
| } |
| |
| 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; |
| } |
| |
| /* |
| * 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 br2684_dev *brdev, |
| struct br2684_vcc *brvcc) |
| { |
| struct atm_vcc *atmvcc; |
| #ifdef FASTER_VERSION |
| if (brvcc->encaps == e_llc) |
| memcpy(skb_push(skb, 8), llc_oui_pid_pad, 8); |
| /* last 2 bytes of llc_oui_pid_pad are managed by header routines; |
| yes, you got it: 8 + 2 = sizeof(llc_oui_pid_pad) |
| */ |
| #else |
| 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; |
| } |
| skb_push(skb, minheadroom); |
| if (brvcc->encaps == e_llc) |
| memcpy(skb->data, llc_oui_pid_pad, 10); |
| else |
| memset(skb->data, 0, 2); |
| #endif /* FASTER_VERSION */ |
| skb_debug(skb); |
| |
| ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; |
| DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); |
| if (!atm_may_send(atmvcc, skb->truesize)) { |
| /* we free this here for now, because we cannot know in a higher |
| layer whether the skb point it supplied wasn't freed yet. |
| now, it always is. |
| */ |
| dev_kfree_skb(skb); |
| return 0; |
| } |
| atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); |
| ATM_SKB(skb)->atm_options = atmvcc->atm_options; |
| brdev->stats.tx_packets++; |
| brdev->stats.tx_bytes += skb->len; |
| atmvcc->send(atmvcc, skb); |
| return 1; |
| } |
| |
| static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb, |
| struct br2684_dev *brdev) |
| { |
| return list_empty(&brdev->brvccs) ? NULL : |
| list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ |
| } |
| |
| static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct br2684_dev *brdev = BRPRIV(dev); |
| struct br2684_vcc *brvcc; |
| |
| DPRINTK("br2684_start_xmit, skb->dst=%p\n", skb->dst); |
| read_lock(&devs_lock); |
| brvcc = pick_outgoing_vcc(skb, brdev); |
| if (brvcc == NULL) { |
| DPRINTK("no vcc attached to dev %s\n", dev->name); |
| brdev->stats.tx_errors++; |
| brdev->stats.tx_carrier_errors++; |
| /* netif_stop_queue(dev); */ |
| dev_kfree_skb(skb); |
| read_unlock(&devs_lock); |
| return 0; |
| } |
| if (!br2684_xmit_vcc(skb, brdev, 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_kfree_skb(skb); |
| */ |
| brdev->stats.tx_errors++; |
| brdev->stats.tx_fifo_errors++; |
| } |
| read_unlock(&devs_lock); |
| return 0; |
| } |
| |
| static struct net_device_stats *br2684_get_stats(struct net_device *dev) |
| { |
| DPRINTK("br2684_get_stats\n"); |
| return &BRPRIV(dev)->stats; |
| } |
| |
| #ifdef FASTER_VERSION |
| /* |
| * These mirror eth_header and eth_header_cache. They are not usually |
| * exported for use in modules, so we grab them from net_device |
| * after ether_setup() is done with it. Bit of a hack. |
| */ |
| static int (*my_eth_header)(struct sk_buff *, struct net_device *, |
| unsigned short, void *, void *, unsigned); |
| static int (*my_eth_header_cache)(struct neighbour *, struct hh_cache *); |
| |
| static int |
| br2684_header(struct sk_buff *skb, struct net_device *dev, |
| unsigned short type, void *daddr, void *saddr, unsigned len) |
| { |
| u16 *pad_before_eth; |
| int t = my_eth_header(skb, dev, type, daddr, saddr, len); |
| if (t > 0) { |
| pad_before_eth = (u16 *) skb_push(skb, 2); |
| *pad_before_eth = 0; |
| return dev->hard_header_len; /* or return 16; ? */ |
| } else |
| return t; |
| } |
| |
| static int |
| br2684_header_cache(struct neighbour *neigh, struct hh_cache *hh) |
| { |
| /* hh_data is 16 bytes long. if encaps is ether-llc we need 24, so |
| xmit will add the additional header part in that case */ |
| u16 *pad_before_eth = (u16 *)(hh->hh_data); |
| int t = my_eth_header_cache(neigh, hh); |
| DPRINTK("br2684_header_cache, neigh=%p, hh_cache=%p\n", neigh, hh); |
| if (t < 0) |
| return t; |
| else { |
| *pad_before_eth = 0; |
| hh->hh_len = PADLEN + ETH_HLEN; |
| } |
| return 0; |
| } |
| |
| /* |
| * This is similar to eth_type_trans, which cannot be used because of |
| * our dev->hard_header_len |
| */ |
| static inline __be16 br_type_trans(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct ethhdr *eth; |
| unsigned char *rawp; |
| eth = eth_hdr(skb); |
| |
| if (is_multicast_ether_addr(eth->h_dest)) { |
| if (!compare_ether_addr(eth->h_dest, dev->broadcast)) |
| skb->pkt_type = PACKET_BROADCAST; |
| else |
| skb->pkt_type = PACKET_MULTICAST; |
| } |
| |
| else if (compare_ether_addr(eth->h_dest, dev->dev_addr)) |
| skb->pkt_type = PACKET_OTHERHOST; |
| |
| if (ntohs(eth->h_proto) >= 1536) |
| return eth->h_proto; |
| |
| rawp = skb->data; |
| |
| /* |
| * This is a magic hack to spot IPX packets. Older Novell breaks |
| * the protocol design and runs IPX over 802.3 without an 802.2 LLC |
| * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This |
| * won't work for fault tolerant netware but does for the rest. |
| */ |
| if (*(unsigned short *) rawp == 0xFFFF) |
| return htons(ETH_P_802_3); |
| |
| /* |
| * Real 802.2 LLC |
| */ |
| return htons(ETH_P_802_2); |
| } |
| #endif /* FASTER_VERSION */ |
| |
| /* |
| * 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 (*my_eth_mac_addr)(struct net_device *, void *); |
| static int br2684_mac_addr(struct net_device *dev, void *p) |
| { |
| int err = my_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) |
| { |
| DPRINTK("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); |
| int plen = sizeof(llc_oui_pid_pad) + ETH_HLEN; |
| |
| DPRINTK("br2684_push\n"); |
| |
| if (unlikely(skb == NULL)) { |
| /* skb==NULL means VCC is being destroyed */ |
| br2684_close_vcc(brvcc); |
| if (list_empty(&brdev->brvccs)) { |
| read_lock(&devs_lock); |
| list_del(&brdev->br2684_devs); |
| read_unlock(&devs_lock); |
| unregister_netdev(net_dev); |
| free_netdev(net_dev); |
| } |
| return; |
| } |
| |
| skb_debug(skb); |
| atm_return(atmvcc, skb->truesize); |
| DPRINTK("skb from brdev %p\n", brdev); |
| if (brvcc->encaps == e_llc) { |
| /* 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) */ |
| if (memcmp(skb->data, llc_oui_pid_pad, 7)) { |
| brdev->stats.rx_errors++; |
| dev_kfree_skb(skb); |
| return; |
| } |
| |
| /* Strip FCS if present */ |
| if (skb->len > 7 && skb->data[7] == 0x01) |
| __skb_trim(skb, skb->len - 4); |
| } else { |
| plen = PADLEN + ETH_HLEN; /* pad, dstmac,srcmac, ethtype */ |
| /* first 2 chars should be 0 */ |
| if (*((u16 *) (skb->data)) != 0) { |
| brdev->stats.rx_errors++; |
| dev_kfree_skb(skb); |
| return; |
| } |
| } |
| if (skb->len < plen) { |
| brdev->stats.rx_errors++; |
| dev_kfree_skb(skb); /* dev_ not needed? */ |
| return; |
| } |
| |
| #ifdef FASTER_VERSION |
| /* FIXME: tcpdump shows that pointer to mac header is 2 bytes earlier, |
| than should be. What else should I set? */ |
| skb_pull(skb, plen); |
| skb->mac.raw = skb->data - ETH_HLEN; |
| skb->pkt_type = PACKET_HOST; |
| #ifdef CONFIG_BR2684_FAST_TRANS |
| skb->protocol = ((u16 *) skb->data)[-1]; |
| #else /* some protocols might require this: */ |
| skb->protocol = br_type_trans(skb, net_dev); |
| #endif /* CONFIG_BR2684_FAST_TRANS */ |
| #else |
| skb_pull(skb, plen - ETH_HLEN); |
| skb->protocol = eth_type_trans(skb, net_dev); |
| #endif /* FASTER_VERSION */ |
| #ifdef CONFIG_ATM_BR2684_IPFILTER |
| if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) { |
| brdev->stats.rx_dropped++; |
| dev_kfree_skb(skb); |
| return; |
| } |
| #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
| skb->dev = net_dev; |
| ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ |
| DPRINTK("received packet's protocol: %x\n", ntohs(skb->protocol)); |
| skb_debug(skb); |
| if (unlikely(!(net_dev->flags & IFF_UP))) { |
| /* sigh, interface is down */ |
| brdev->stats.rx_dropped++; |
| dev_kfree_skb(skb); |
| return; |
| } |
| brdev->stats.rx_packets++; |
| brdev->stats.rx_bytes += skb->len; |
| memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); |
| netif_rx(skb); |
| } |
| |
| static int br2684_regvcc(struct atm_vcc *atmvcc, void __user *arg) |
| { |
| /* assign a vcc to a dev |
| Note: we do not have explicit unassign, but look at _push() |
| */ |
| int err; |
| struct br2684_vcc *brvcc; |
| struct sk_buff *skb; |
| 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; |
| } |
| DPRINTK("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; |
| barrier(); |
| atmvcc->push = br2684_push; |
| |
| rq = &sk_atm(atmvcc)->sk_receive_queue; |
| |
| spin_lock_irqsave(&rq->lock, flags); |
| if (skb_queue_empty(rq)) { |
| skb = NULL; |
| } else { |
| /* NULL terminate the list. */ |
| rq->prev->next = NULL; |
| skb = rq->next; |
| } |
| rq->prev = rq->next = (struct sk_buff *)rq; |
| rq->qlen = 0; |
| spin_unlock_irqrestore(&rq->lock, flags); |
| |
| while (skb) { |
| struct sk_buff *next = skb->next; |
| |
| skb->next = skb->prev = NULL; |
| BRPRIV(skb->dev)->stats.rx_bytes -= skb->len; |
| BRPRIV(skb->dev)->stats.rx_packets--; |
| br2684_push(atmvcc, skb); |
| |
| skb = next; |
| } |
| __module_get(THIS_MODULE); |
| return 0; |
| error: |
| write_unlock_irq(&devs_lock); |
| kfree(brvcc); |
| return err; |
| } |
| |
| static void br2684_setup(struct net_device *netdev) |
| { |
| struct br2684_dev *brdev = BRPRIV(netdev); |
| |
| ether_setup(netdev); |
| brdev->net_dev = netdev; |
| |
| #ifdef FASTER_VERSION |
| my_eth_header = netdev->hard_header; |
| netdev->hard_header = br2684_header; |
| my_eth_header_cache = netdev->hard_header_cache; |
| netdev->hard_header_cache = br2684_header_cache; |
| netdev->hard_header_len = sizeof(llc_oui_pid_pad) + ETH_HLEN; /* 10 + 14 */ |
| #endif |
| my_eth_mac_addr = netdev->set_mac_address; |
| netdev->set_mac_address = br2684_mac_addr; |
| netdev->hard_start_xmit = br2684_start_xmit; |
| netdev->get_stats = br2684_get_stats; |
| |
| 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; |
| |
| DPRINTK("br2684_create\n"); |
| |
| if (copy_from_user(&ni, arg, sizeof ni)) { |
| return -EFAULT; |
| } |
| 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", |
| br2684_setup); |
| if (!netdev) |
| return -ENOMEM; |
| |
| brdev = BRPRIV(netdev); |
| |
| DPRINTK("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->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; |
| |
| int err; |
| switch(cmd) { |
| case ATM_SETBACKEND: |
| case ATM_NEWBACKENDIF: { |
| atm_backend_t b; |
| 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) |
| { |
| loff_t offs = 0; |
| struct br2684_dev *brd; |
| |
| read_lock(&devs_lock); |
| |
| list_for_each_entry(brd, &br2684_devs, br2684_devs) { |
| if (offs == *pos) |
| return brd; |
| ++offs; |
| } |
| return NULL; |
| } |
| |
| static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct br2684_dev *brd = v; |
| |
| ++*pos; |
| |
| brd = list_entry(brd->br2684_devs.next, |
| struct br2684_dev, br2684_devs); |
| return (&brd->br2684_devs != &br2684_devs) ? brd : NULL; |
| } |
| |
| static void br2684_seq_stop(struct seq_file *seq, void *v) |
| { |
| read_unlock(&devs_lock); |
| } |
| |
| static int br2684_seq_show(struct seq_file *seq, void *v) |
| { |
| const struct br2684_dev *brdev = v; |
| const struct net_device *net_dev = brdev->net_dev; |
| const struct br2684_vcc *brvcc; |
| |
| seq_printf(seq, "dev %.16s: num=%d, mac=%02X:%02X:" |
| "%02X:%02X:%02X:%02X (%s)\n", net_dev->name, |
| brdev->number, |
| net_dev->dev_addr[0], |
| net_dev->dev_addr[1], |
| net_dev->dev_addr[2], |
| net_dev->dev_addr[3], |
| net_dev->dev_addr[4], |
| net_dev->dev_addr[5], |
| brdev->mac_was_set ? "set" : "auto"); |
| |
| list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { |
| seq_printf(seq, " vcc %d.%d.%d: encaps=%s" |
| #ifndef FASTER_VERSION |
| ", failed copies %u/%u" |
| #endif /* FASTER_VERSION */ |
| "\n", brvcc->atmvcc->dev->number, |
| brvcc->atmvcc->vpi, brvcc->atmvcc->vci, |
| (brvcc->encaps == e_llc) ? "LLC" : "VC" |
| #ifndef FASTER_VERSION |
| , brvcc->copies_failed |
| , brvcc->copies_needed |
| #endif /* FASTER_VERSION */ |
| ); |
| #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 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 |
| |
| static int __init br2684_init(void) |
| { |
| #ifdef CONFIG_PROC_FS |
| struct proc_dir_entry *p; |
| if ((p = create_proc_entry("br2684", 0, atm_proc_root)) == NULL) |
| return -ENOMEM; |
| p->proc_fops = &br2684_proc_ops; |
| #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"); |