From 097b19a9987204b898299260ee3ebff4cf716800 Mon Sep 17 00:00:00 2001 From: Eric Kinzie Date: Sun, 30 Dec 2007 23:17:53 -0800 Subject: [PATCH] [ATM]: [br2864] routed support Signed-off-by: Chas Williams Signed-off-by: David S. Miller --- include/linux/atmbr2684.h | 18 ++++- net/atm/br2684.c | 148 +++++++++++++++++++++++++++++--------- 2 files changed, 133 insertions(+), 33 deletions(-) diff --git a/include/linux/atmbr2684.h b/include/linux/atmbr2684.h index 969fb6c9e1cc..ccdab6c216cd 100644 --- a/include/linux/atmbr2684.h +++ b/include/linux/atmbr2684.h @@ -14,6 +14,9 @@ #define BR2684_MEDIA_FDDI (3) #define BR2684_MEDIA_802_6 (4) /* 802.6 */ + /* used only at device creation: */ +#define BR2684_FLAG_ROUTED (1<<16) /* payload is routed, not bridged */ + /* * Is there FCS inbound on this VC? This currently isn't supported. */ @@ -35,6 +38,14 @@ #define BR2684_ENCAPS_LLC (1) #define BR2684_ENCAPS_AUTODETECT (2) /* Unsuported */ +/* + * Is this VC bridged or routed? + */ + +#define BR2684_PAYLOAD_ROUTED (0) +#define BR2684_PAYLOAD_BRIDGED (1) + + /* * This is for the ATM_NEWBACKENDIF call - these are like socket families: * the first element of the structure is the backend number and the rest @@ -42,7 +53,7 @@ */ struct atm_newif_br2684 { atm_backend_t backend_num; /* ATM_BACKEND_BR2684 */ - int media; /* BR2684_MEDIA_* */ + int media; /* BR2684_MEDIA_*, flags in upper bits */ char ifname[IFNAMSIZ]; int mtu; }; @@ -95,6 +106,11 @@ struct br2684_filter_set { struct br2684_filter filter; }; +enum br2684_payload { + p_routed = BR2684_PAYLOAD_ROUTED, + p_bridged = BR2684_PAYLOAD_BRIDGED, +}; + #define BR2684_SETFILT _IOW( 'a', ATMIOC_BACKEND + 0, \ struct br2684_filter_set) diff --git a/net/atm/br2684.c b/net/atm/br2684.c index ba6428f204f9..d9bb2a16b7cb 100644 --- a/net/atm/br2684.c +++ b/net/atm/br2684.c @@ -1,7 +1,8 @@ /* -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 @@ -39,9 +40,27 @@ 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, @@ -69,6 +88,7 @@ struct br2684_dev { struct list_head brvccs; /* one device <=> one vcc (before xmas) */ struct net_device_stats stats; int mac_was_set; + enum br2684_payload payload; }; /* @@ -136,6 +156,7 @@ static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev, { 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++; @@ -146,11 +167,32 @@ 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; @@ -299,7 +341,6 @@ 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 +361,50 @@ 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) { + + 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) */ - if (memcmp(skb->data, llc_oui_pid_pad, 7)) { + } 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++; @@ -482,25 +538,52 @@ static void br2684_setup(struct net_device *netdev) 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; + 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 +599,7 @@ 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); @@ -601,14 +685,14 @@ 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) -- 2.20.1