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openwrt-mirror/target/linux/generic-2.4/patches/226-atm_br2684.patch
Andy Boyett 22dfa7ae22 refresh patches 
SVN-Revision: 17553
2009-09-10 10:06:35 +00:00

577 lines
17 KiB
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--- a/net/atm/br2684.c
+++ b/net/atm/br2684.c
@@ -55,36 +55,55 @@ static void skb_debug(const struct sk_bu
#define skb_debug(skb) do {} while (0)
#endif
+#define BR2684_LLC_LEN 3
+#define BR2684_SNAP_LEN 3
+#define BR2684_ETHERTYPE_LEN 2
+#define BR2684_PID_LEN 2
+#define BR2684_PAD_LEN 2
+
+static unsigned char llc_common[] = { 0xaa, 0xaa, 0x03 };
+static unsigned char snap_bridged[] = { 0x00, 0x80, 0xc2 };
+static unsigned char snap_routed[] = { 0x00, 0x00, 0x00 };
+static unsigned char pid_ipv4[] = { 0x00, 0x07 };
+static unsigned char ethertype_ipv4[] = { 0x08, 0x00 };
+static unsigned char ethertype_ipv6[] = { 0x86, 0xdd };
+static unsigned char pad_bridged[] = { 0x00, 0x00 };
+
static unsigned char llc_oui_pid_pad[] =
{ 0xAA, 0xAA, 0x03, 0x00, 0x80, 0xC2, 0x00, 0x07, 0x00, 0x00 };
+static unsigned char llc_oui_ipv6[] =
+ { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x00, 0x86, 0xdd };
+static unsigned char llc_oui_ipv4[] =
+ { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x00, 0x08, 0x00 };
#define PADLEN (2)
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 br2684_dev *brdev;
/* keep old push,pop functions for chaining */
- void (*old_push)(struct atm_vcc *vcc,struct sk_buff *skb);
+ 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;
+ enum br2684_payload payload;
struct list_head brvccs;
#ifdef CONFIG_ATM_BR2684_IPFILTER
struct br2684_filter filter;
-#endif /* CONFIG_ATM_BR2684_IPFILTER */
+#endif /* CONFIG_ATM_BR2684_IPFILTER */
#ifndef FASTER_VERSION
unsigned copies_needed, copies_failed;
-#endif /* FASTER_VERSION */
+#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 list_head brvccs; /* one device <=> one vcc (before xmas) */
struct net_device_stats stats;
int mac_was_set;
};
@@ -173,24 +192,84 @@ static int br2684_xmit_vcc(struct sk_buf
}
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 */
+
+ /* This skb_push is a problem: routed packets need less headroom than
+ * bridged packets.
+ */
+
+/* skb_push(skb, minheadroom); */
+ if (brvcc->encaps == e_llc) {
+ int offset = 0;
+ int actual_headroom;
+
+ actual_headroom =
+ BR2684_LLC_LEN +
+ BR2684_SNAP_LEN +
+ ((brvcc->payload == p_bridged) ?
+ (BR2684_PID_LEN + BR2684_PAD_LEN) :
+ BR2684_ETHERTYPE_LEN);
+
+ skb_push(skb, actual_headroom);
+ memcpy(skb->data, llc_common, BR2684_LLC_LEN);
+ offset += BR2684_LLC_LEN;
+
+ if (brvcc->payload == p_bridged) {
+ memcpy(skb->data + offset, snap_bridged,
+ BR2684_SNAP_LEN);
+ offset += BR2684_SNAP_LEN;
+ /* pid_ipv4 is poorly named. should probably be
+ * pid_ethernet
+ */
+ memcpy(skb->data + offset, pid_ipv4,
+ BR2684_PID_LEN);
+ offset += BR2684_PID_LEN;
+ memcpy(skb->data + offset, pad_bridged,
+ BR2684_PAD_LEN);
+ offset += BR2684_PAD_LEN;
+ } else if (brvcc->payload == p_routed) {
+ unsigned short prot =
+ __constant_ntohs(skb->protocol);
+ memcpy(skb->data + offset, snap_routed,
+ BR2684_SNAP_LEN);
+ offset += BR2684_SNAP_LEN;
+
+ switch (prot) {
+ case ETH_P_IP:
+ memcpy(skb->data + offset,
+ ethertype_ipv4,
+ BR2684_ETHERTYPE_LEN);
+ break;
+ case ETH_P_IPV6:
+ memcpy(skb->data + offset,
+ ethertype_ipv6,
+ BR2684_ETHERTYPE_LEN);
+ break;
+ default:
+ dev_kfree_skb(skb);
+ return 0;
+ }
+ offset += BR2684_ETHERTYPE_LEN;
+
+ }
+ } else {
+ skb_push(skb, 2);
+ if (brvcc->payload == p_bridged)
+ 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);
+ 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.
- */
+ 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, &atmvcc->sk->wmem_alloc);
ATM_SKB(skb)->atm_options = atmvcc->atm_options;
brdev->stats.tx_packets++;
@@ -428,18 +507,39 @@ static void br2684_push(struct atm_vcc *
atm_return(atmvcc, skb->truesize);
DPRINTK("skb from brdev %p\n", brdev);
if (brvcc->encaps == e_llc) {
+ /* accept packets that have "ipv[46]" in the snap header */
+ /* 8 - 2 == sizeof(llc_oui_ipv6) - BR2684_ETHERTYPE_LEN */
+ if (memcmp(skb->data, llc_oui_ipv6, 8 - 2) == 0) {
+ plen = sizeof(llc_oui_ipv6);
+
+ if (memcmp(skb->data + 6, ethertype_ipv6, 2) == 0)
+ skb->protocol =
+ __constant_htons(ETH_P_IPV6);
+ else if (memcmp(skb->data + 6, ethertype_ipv4, 2)
+ == 0)
+ skb->protocol = __constant_htons(ETH_P_IP);
+ else {
+ brdev->stats.rx_errors++;
+ dev_kfree_skb(skb);
+ return;
+ }
+ skb_pull(skb, plen);
+ skb->nh.raw = skb->data;
+ 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 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0) {
+ skb_pull(skb, plen - ETH_HLEN);
+ skb->protocol =
+ eth_type_trans(skb, &brdev->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 */
@@ -448,13 +548,14 @@ static void br2684_push(struct atm_vcc *
dev_kfree_skb(skb);
return;
}
+ skb_pull(skb, plen - ETH_HLEN);
+ skb->protocol = eth_type_trans(skb, &brdev->net_dev);
}
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? */
@@ -465,30 +566,29 @@ static void br2684_push(struct atm_vcc *
skb->protocol = ((u16 *) skb->data)[-1];
#else /* some protocols might require this: */
skb->protocol = br_type_trans(skb, &brdev->net_dev);
-#endif /* CONFIG_BR2684_FAST_TRANS */
+#endif /* CONFIG_BR2684_FAST_TRANS */
#else
- skb_pull(skb, plen - ETH_HLEN);
- skb->protocol = eth_type_trans(skb, &brdev->net_dev);
-#endif /* FASTER_VERSION */
+ /* skb_pull(skb, plen - ETH_HLEN); */
+ /* skb->protocol = eth_type_trans(skb, &brdev->net_dev); */
+#endif /* FASTER_VERSION */
#ifdef CONFIG_ATM_BR2684_IPFILTER
if (packet_fails_filter(skb->protocol, brvcc, skb)) {
brdev->stats.rx_dropped++;
dev_kfree_skb(skb);
return;
}
-#endif /* CONFIG_ATM_BR2684_IPFILTER */
+#endif /* CONFIG_ATM_BR2684_IPFILTER */
skb->dev = &brdev->net_dev;
- ATM_SKB(skb)->vcc = atmvcc; /* needed ? */
+ /* ATM_SKB(skb)->vcc = atmvcc; *//* needed ? */
DPRINTK("received packet's protocol: %x\n", ntohs(skb->protocol));
skb_debug(skb);
- if (!(brdev->net_dev.flags & IFF_UP)) { /* sigh, interface is down */
+ if (!(brdev->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);
}
@@ -529,10 +629,10 @@ Note: we do not have explicit unassign,
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) {
+ 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;
}
@@ -553,18 +653,21 @@ Note: we do not have explicit unassign,
brvcc->atmvcc = atmvcc;
atmvcc->user_back = brvcc;
brvcc->encaps = (enum br2684_encaps) be.encaps;
+ brvcc->payload = (enum br2684_payload) be.payload;
brvcc->old_push = atmvcc->push;
barrier();
atmvcc->push = br2684_push;
skb_queue_head_init(&copy);
skb_migrate(&atmvcc->sk->receive_queue, &copy);
while ((skb = skb_dequeue(&copy))) {
+#ifdef notdef
BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
BRPRIV(skb->dev)->stats.rx_packets--;
+#endif
br2684_push(atmvcc, skb);
}
return 0;
- error:
+ error:
write_unlock_irq(&devs_lock);
kfree(brvcc);
MOD_DEC_USE_COUNT;
@@ -608,12 +711,25 @@ static int br2684_create(unsigned long a
if (ni.ifname[0] != '\0') {
memcpy(brdev->net_dev.name, ni.ifname,
- sizeof(brdev->net_dev.name));
- brdev->net_dev.name[sizeof(brdev->net_dev.name) - 1] = '\0';
+ sizeof(brdev->net_dev.name));
+ brdev->net_dev.name[sizeof(brdev->net_dev.name) - 1] =
+ '\0';
} else
sprintf(brdev->net_dev.name, "nas%d", brdev->number);
DPRINTK("registered netdev %s\n", brdev->net_dev.name);
- ether_setup(&brdev->net_dev);
+ if (ni.payload == p_routed) {
+ brdev->net_dev.hard_header_len = 0;
+ brdev->net_dev.addr_len = 0;
+ brdev->net_dev.mtu = 1500;
+
+ /* Type PPP seems most suitable */
+ brdev->net_dev.type = ARPHRD_PPP;
+ brdev->net_dev.flags =
+ IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
+ brdev->net_dev.tx_queue_len = 100;
+ } else {
+ ether_setup(&brdev->net_dev);
+ }
brdev->mac_was_set = 0;
#ifdef FASTER_VERSION
my_eth_header = brdev->net_dev.hard_header;
@@ -677,12 +793,11 @@ static int br2684_ioctl(struct atm_vcc *
err = br2684_setfilt(atmvcc, arg);
MOD_DEC_USE_COUNT;
return err;
-#endif /* CONFIG_ATM_BR2684_IPFILTER */
+#endif /* CONFIG_ATM_BR2684_IPFILTER */
}
return -ENOIOCTLCMD;
}
-#ifdef CONFIG_PROC_FS
/* Never put more than 256 bytes in at once */
static int br2684_proc_engine(loff_t pos, char *buf)
{
@@ -692,52 +807,62 @@ static int br2684_proc_engine(loff_t pos
list_for_each(lhd, &br2684_devs) {
brdev = list_entry_brdev(lhd);
if (pos-- == 0)
- return sprintf(buf, "dev %.16s: num=%d, mac=%02X:%02X:"
- "%02X:%02X:%02X:%02X (%s)\n", brdev->net_dev.name,
- brdev->number,
- brdev->net_dev.dev_addr[0],
- brdev->net_dev.dev_addr[1],
- brdev->net_dev.dev_addr[2],
- brdev->net_dev.dev_addr[3],
- brdev->net_dev.dev_addr[4],
- brdev->net_dev.dev_addr[5],
- brdev->mac_was_set ? "set" : "auto");
+ return sprintf(buf,
+ "dev %.16s: num=%d, mac=%02X:%02X:"
+ "%02X:%02X:%02X:%02X (%s)\n",
+ brdev->net_dev.name, brdev->number,
+ brdev->net_dev.dev_addr[0],
+ brdev->net_dev.dev_addr[1],
+ brdev->net_dev.dev_addr[2],
+ brdev->net_dev.dev_addr[3],
+ brdev->net_dev.dev_addr[4],
+ brdev->net_dev.dev_addr[5],
+ brdev->
+ mac_was_set ? "set" : "auto");
list_for_each(lhc, &brdev->brvccs) {
brvcc = list_entry_brvcc(lhc);
if (pos-- == 0)
- return sprintf(buf, " vcc %d.%d.%d: encaps=%s"
+ return sprintf(buf,
+ " vcc %d.%d.%d: encaps=%s"
+ ", payload=%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"
+ ", failed copies %u/%u"
+#endif /* FASTER_VERSION */
+ "\n",
+ brvcc->atmvcc->dev->number,
+ brvcc->atmvcc->vpi,
+ brvcc->atmvcc->vci,
+ (brvcc->encaps ==
+ e_llc) ? "LLC" : "VC",
+ (brvcc->payload ==
+ p_bridged) ? "bridged" :
+ "routed"
#ifndef FASTER_VERSION
- , brvcc->copies_failed
- , brvcc->copies_needed
-#endif /* 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 && pos-- == 0)
- return sprintf(buf, " filter=%d.%d.%d.%d/"
- "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
+ return sprintf(buf,
+ " filter=%d.%d.%d.%d/"
+ "%d.%d.%d.%d\n", bs(prefix),
+ bs(netmask));
#undef bs
#undef b1
-#endif /* CONFIG_ATM_BR2684_IPFILTER */
+#endif /* CONFIG_ATM_BR2684_IPFILTER */
}
}
return 0;
}
static ssize_t br2684_proc_read(struct file *file, char *buf, size_t count,
- loff_t *pos)
+ loff_t * pos)
{
unsigned long page;
int len = 0, x, left;
- loff_t n = *pos;
-
page = get_free_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
@@ -746,7 +871,7 @@ static ssize_t br2684_proc_read(struct f
left = count;
read_lock(&devs_lock);
for (;;) {
- x = br2684_proc_engine(n, &((char *) page)[len]);
+ x = br2684_proc_engine(*pos, &((char *) page)[len]);
if (x == 0)
break;
if (x > left)
@@ -761,12 +886,11 @@ static ssize_t br2684_proc_read(struct f
}
len += x;
left -= x;
- n++;
+ (*pos)++;
if (left < 256)
break;
}
read_unlock(&devs_lock);
- *pos = n;
if (len > 0 && copy_to_user(buf, (char *) page, len))
len = -EFAULT;
free_page(page);
@@ -774,23 +898,20 @@ static ssize_t br2684_proc_read(struct f
}
static struct file_operations br2684_proc_operations = {
- read: br2684_proc_read,
+ read:br2684_proc_read,
};
extern struct proc_dir_entry *atm_proc_root; /* from proc.c */
-#endif /* CONFIG_PROC_FS */
/* the following avoids some spurious warnings from the compiler */
#define UNUSED __attribute__((unused))
static int __init UNUSED 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_operations;
-#endif /* CONFIG_PROC_FS */
br2684_ioctl_set(br2684_ioctl);
return 0;
}
@@ -799,9 +920,7 @@ static void __exit UNUSED br2684_exit(vo
{
struct br2684_dev *brdev;
br2684_ioctl_set(NULL);
-#ifdef CONFIG_PROC_FS
remove_proc_entry("br2684", atm_proc_root);
-#endif /* CONFIG_PROC_FS */
while (!list_empty(&br2684_devs)) {
brdev = list_entry_brdev(br2684_devs.next);
unregister_netdev(&brdev->net_dev);
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -158,6 +158,7 @@ void br2684_ioctl_set(int (*hook)(struct
}
#ifdef CONFIG_ATM_BR2684_MODULE
EXPORT_SYMBOL(br2684_ioctl_set);
+EXPORT_SYMBOL(br2684_ioctl_hook);
#endif
#endif
--- a/include/linux/atmbr2684.h
+++ b/include/linux/atmbr2684.h
@@ -3,6 +3,7 @@
#include <linux/atm.h>
#include <linux/if.h> /* For IFNAMSIZ */
+#include <linux/if_ether.h> /* ETH_P_* */
/*
* Type of media we're bridging (ethernet, token ring, etc) Currently only
@@ -36,15 +37,24 @@
#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
* is per-backend specific
*/
struct atm_newif_br2684 {
- atm_backend_t backend_num; /* ATM_BACKEND_BR2684 */
- int media; /* BR2684_MEDIA_* */
- char ifname[IFNAMSIZ];
- int mtu;
+ atm_backend_t backend_num; /* ATM_BACKEND_BR2684 */
+ int media; /* BR2684_MEDIA_* */
+ char ifname[IFNAMSIZ];
+ int mtu;
+ int payload; /* bridged or routed */
};
/*
@@ -68,16 +78,17 @@ struct br2684_if_spec {
* is per-backend specific
*/
struct atm_backend_br2684 {
- atm_backend_t backend_num; /* ATM_BACKEND_BR2684 */
+ atm_backend_t backend_num; /* ATM_BACKEND_BR2684 */
struct br2684_if_spec ifspec;
- int fcs_in; /* BR2684_FCSIN_* */
- int fcs_out; /* BR2684_FCSOUT_* */
- int fcs_auto; /* 1: fcs_{in,out} disabled if no FCS rx'ed */
- int encaps; /* BR2684_ENCAPS_* */
- int has_vpiid; /* 1: use vpn_id - Unsupported */
- __u8 vpn_id[7];
- int send_padding; /* unsupported */
- int min_size; /* we will pad smaller packets than this */
+ int fcs_in; /* BR2684_FCSIN_* */
+ int fcs_out; /* BR2684_FCSOUT_* */
+ int fcs_auto; /* 1: fcs_{in,out} disabled if no FCS rx'ed */
+ int encaps; /* BR2684_ENCAPS_* */
+ int payload; /* BR2684_PAYLOAD_* */
+ int has_vpiid; /* 1: use vpn_id - Unsupported */
+ __u8 vpn_id[7];
+ int send_padding; /* unsupported */
+ int min_size; /* we will pad smaller packets than this */
};
/*
@@ -95,7 +106,12 @@ 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)
-#endif /* _LINUX_ATMBR2684_H */
+#endif /* _LINUX_ATMBR2684_H */
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