diff options
Diffstat (limited to 'net/atm/br2684.c')
-rw-r--r-- | net/atm/br2684.c | 296 |
1 files changed, 194 insertions, 102 deletions
diff --git a/net/atm/br2684.c b/net/atm/br2684.c index ba6428f..574d9a9 100644 --- a/net/atm/br2684.c +++ b/net/atm/br2684.c @@ -1,8 +1,10 @@ /* -Experimental ethernet netdevice using ATM AAL5 as underlying carrier -(RFC1483 obsoleted by RFC2684) for Linux 2.4 -Author: Marcell GAL, 2000, XDSL Ltd, Hungary -*/ + * 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> @@ -39,21 +41,35 @@ static void skb_debug(const struct sk_buff *skb) #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 unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 }; +static unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 }; static unsigned char llc_oui_pid_pad[] = - { 0xAA, 0xAA, 0x03, 0x00, 0x80, 0xC2, 0x00, 0x07, 0x00, 0x00 }; -#define PADLEN (2) + { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED }; +static unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 }; +static unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 }; enum br2684_encaps { - e_vc = BR2684_ENCAPS_VC, + e_vc = BR2684_ENCAPS_VC, e_llc = BR2684_ENCAPS_LLC, }; struct br2684_vcc { - struct atm_vcc *atmvcc; + 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); */ + /* 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 @@ -66,9 +82,10 @@ 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 list_head brvccs; /* one device <=> one vcc (before xmas) */ struct net_device_stats stats; int mac_was_set; + enum br2684_payload payload; }; /* @@ -84,7 +101,7 @@ static LIST_HEAD(br2684_devs); static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) { - return (struct br2684_dev *) net_dev->priv; + return (struct br2684_dev *)net_dev->priv; } static inline struct net_device *list_entry_brdev(const struct list_head *le) @@ -94,7 +111,7 @@ static inline struct net_device *list_entry_brdev(const struct list_head *le) static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) { - return (struct br2684_vcc *) (atmvcc->user_back); + return (struct br2684_vcc *)(atmvcc->user_back); } static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) @@ -132,10 +149,11 @@ static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) * otherwise false */ static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev, - struct br2684_vcc *brvcc) + struct br2684_vcc *brvcc) { 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++; @@ -146,23 +164,48 @@ static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev, } skb = skb2; } - skb_push(skb, minheadroom); - if (brvcc->encaps == e_llc) - skb_copy_to_linear_data(skb, llc_oui_pid_pad, 10); - else - memset(skb->data, 0, 2); + + 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 { + skb_push(skb, 2); + if (brdev->payload == p_bridged) + 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); 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. - */ + /* + * We free this here for now, because we cannot know in a higher + * layer whether the skb pointer 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++; @@ -172,10 +215,9 @@ static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev, } static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb, - struct br2684_dev *brdev) + struct br2684_dev *brdev) { - return list_empty(&brdev->brvccs) ? NULL : - list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ + 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) @@ -199,11 +241,10 @@ static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev) /* * We should probably use netif_*_queue() here, but that * involves added complication. We need to walk before - * we can run + * we can run. + * + * Don't free here! this pointer might be no longer valid! */ - /* don't free here! this pointer might be no longer valid! - dev_kfree_skb(skb); - */ brdev->stats.tx_errors++; brdev->stats.tx_fifo_errors++; } @@ -217,12 +258,11 @@ static struct net_device_stats *br2684_get_stats(struct net_device *dev) return &BRPRIV(dev)->stats; } - /* * 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 (*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); @@ -233,7 +273,7 @@ static int br2684_mac_addr(struct net_device *dev, void *p) #ifdef CONFIG_ATM_BR2684_IPFILTER /* this IOCTL is experimental. */ -static int br2684_setfilt(struct atm_vcc *atmvcc, void __user *arg) +static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) { struct br2684_vcc *brvcc; struct br2684_filter_set fs; @@ -243,13 +283,12 @@ static int br2684_setfilt(struct atm_vcc *atmvcc, void __user *arg) if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { /* * This is really a per-vcc thing, but we can also search - * by device + * 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 */ + 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); @@ -267,15 +306,16 @@ 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 */ + return 0; /* no filter in place */ if (type == htons(ETH_P_IP) && - (((struct iphdr *) (skb->data))->daddr & brvcc->filter. + (((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? + /* + * 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 */ } @@ -299,7 +339,6 @@ 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; pr_debug("br2684_push\n"); @@ -320,35 +359,58 @@ static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) atm_return(atmvcc, skb->truesize); pr_debug("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)) { + + 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 = __constant_htons(ETH_P_IPV6); + else if (memcmp + (skb->data + 6, ethertype_ipv4, + sizeof(ethertype_ipv4)) == 0) + skb->protocol = __constant_htons(ETH_P_IP); + else { + brdev->stats.rx_errors++; + dev_kfree_skb(skb); + return; + } + 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 { 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; + skb_pull(skb, BR2684_PAD_LEN + ETH_HLEN); /* pad, dstmac, srcmac, ethtype */ + skb->protocol = eth_type_trans(skb, net_dev); } - skb_pull(skb, plen - ETH_HLEN); - skb->protocol = eth_type_trans(skb, net_dev); #ifdef CONFIG_ATM_BR2684_IPFILTER if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) { brdev->stats.rx_dropped++; @@ -372,11 +434,12 @@ static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) 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() + */ +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; @@ -395,7 +458,7 @@ Note: we do not have explicit unassign, but look at _push() net_dev = br2684_find_dev(&be.ifspec); if (net_dev == NULL) { printk(KERN_ERR - "br2684: tried to attach to non-existant device\n"); + "br2684: tried to attach to non-existant device\n"); err = -ENXIO; goto error; } @@ -411,13 +474,15 @@ Note: we do not have explicit unassign, but look at _push() } 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) { + 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); + 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]) @@ -430,7 +495,7 @@ Note: we do not have explicit unassign, but look at _push() brvcc->device = net_dev; brvcc->atmvcc = atmvcc; atmvcc->user_back = brvcc; - brvcc->encaps = (enum br2684_encaps) be.encaps; + brvcc->encaps = (enum br2684_encaps)be.encaps; brvcc->old_push = atmvcc->push; barrier(); atmvcc->push = br2684_push; @@ -461,7 +526,7 @@ Note: we do not have explicit unassign, but look at _push() } __module_get(THIS_MODULE); return 0; - error: + error: write_unlock_irq(&devs_lock); kfree(brvcc); return err; @@ -482,25 +547,52 @@ static void br2684_setup(struct net_device *netdev) INIT_LIST_HEAD(&brdev->brvccs); } -static int br2684_create(void __user *arg) +static void br2684_setup_routed(struct net_device *netdev) +{ + struct br2684_dev *brdev = BRPRIV(netdev); + brdev->net_dev = netdev; + + netdev->hard_header_len = 0; + 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; + 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", - br2684_setup); + (payload == p_routed) ? + br2684_setup_routed : br2684_setup); if (!netdev) return -ENOMEM; @@ -516,6 +608,7 @@ static int br2684_create(void __user *arg) } 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); @@ -528,16 +621,16 @@ static int br2684_create(void __user *arg) * -ENOIOCTLCMD for any unrecognized ioctl */ static int br2684_ioctl(struct socket *sock, unsigned int cmd, - unsigned long arg) + unsigned long arg) { struct atm_vcc *atmvcc = ATM_SD(sock); void __user *argp = (void __user *)arg; + atm_backend_t b; int err; - switch(cmd) { + switch (cmd) { case ATM_SETBACKEND: - case ATM_NEWBACKENDIF: { - atm_backend_t b; + case ATM_NEWBACKENDIF: err = get_user(b, (atm_backend_t __user *) argp); if (err) return -EFAULT; @@ -549,7 +642,6 @@ static int br2684_ioctl(struct socket *sock, unsigned int cmd, return br2684_regvcc(atmvcc, argp); else return br2684_create(argp); - } #ifdef CONFIG_ATM_BR2684_IPFILTER case BR2684_SETFILT: if (atmvcc->push != br2684_push) @@ -557,6 +649,7 @@ static int br2684_ioctl(struct socket *sock, unsigned int cmd, if (!capable(CAP_NET_ADMIN)) return -EPERM; err = br2684_setfilt(atmvcc, argp); + return err; #endif /* CONFIG_ATM_BR2684_IPFILTER */ } @@ -564,24 +657,25 @@ static int br2684_ioctl(struct socket *sock, unsigned int cmd, } static struct atm_ioctl br2684_ioctl_ops = { - .owner = THIS_MODULE, - .ioctl = br2684_ioctl, + .owner = THIS_MODULE, + .ioctl = br2684_ioctl, }; - #ifdef CONFIG_PROC_FS -static void *br2684_seq_start(struct seq_file *seq, loff_t *pos) +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) +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); } @@ -589,7 +683,7 @@ static void br2684_seq_stop(struct seq_file *seq, void *v) static int br2684_seq_show(struct seq_file *seq, void *v) { const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, - br2684_devs); + br2684_devs); const struct net_device *net_dev = brdev->net_dev; const struct br2684_vcc *brvcc; DECLARE_MAC_BUF(mac); @@ -601,21 +695,19 @@ static int br2684_seq_show(struct seq_file *seq, void *v) brdev->mac_was_set ? "set" : "auto"); list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { - seq_printf(seq, " vcc %d.%d.%d: encaps=%s" - ", failed copies %u/%u" - "\n", brvcc->atmvcc->dev->number, - brvcc->atmvcc->vpi, brvcc->atmvcc->vci, - (brvcc->encaps == e_llc) ? "LLC" : "VC" - , brvcc->copies_failed - , brvcc->copies_needed - ); + 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)); + 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 */ @@ -625,9 +717,9 @@ static int br2684_seq_show(struct seq_file *seq, void *v) static const struct seq_operations br2684_seq_ops = { .start = br2684_seq_start, - .next = br2684_seq_next, - .stop = br2684_seq_stop, - .show = br2684_seq_show, + .next = br2684_seq_next, + .stop = br2684_seq_stop, + .show = br2684_seq_show, }; static int br2684_proc_open(struct inode *inode, struct file *file) @@ -636,15 +728,15 @@ static int br2684_proc_open(struct inode *inode, struct file *file) } static const struct file_operations br2684_proc_ops = { - .owner = THIS_MODULE, - .open = br2684_proc_open, - .read = seq_read, - .llseek = seq_lseek, + .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 +#endif /* CONFIG_PROC_FS */ static int __init br2684_init(void) { |