/* Gets the escaped stringified version of an attribute list.
*
* The string returned must be free()'d by the caller.
*
* If find_delta is set to true, only the attributes that have changed since
* the last serialize are updated.
*/
SLPError SLPAttrSerialize(SLPAttributes attr_h, size_t *count, char **str, SLPBoolean find_delta) {
struct xx_SLPAttributes *slp_attr = (struct xx_SLPAttributes *)attr_h;
var_t *var; /* For iterating. */
unsigned int size; /* Size of the string to allocate. */
unsigned int var_count; /* To count the number of variables. */
char *build_str; /* The string that is being built. */
char *cur; /* Current location within the already allocated str. */
size = 0;
var_count = 0;
/***** Find the size of string needed for the attribute string. *****/
for (var = slp_attr->attrs; var != NULL; var = var->next) {
/*** Skip old attributes. ***/
if (find_delta == SLP_TRUE && var->modified == SLP_FALSE) {
continue;
}
/*** Get size of tag ***/
size += var->tag_len;
/*** Count the size needed for the value list ***/
if (var->type != SLP_KEYWORD) {
value_t *value;
/** Get size of data **/
value = var->list;
while (value) {
size += value->escaped_len;
value = value->next;
}
/** Count number of commas needed for multivalued attributes. **/
assert(var->list_size >= 0);
size += (var->list_size - 1) * VAR_SEPARATOR_LEN;
/** Count the semantics needed to store a multivalue list **/
size += VAR_NON_KEYWORD_SEMANTIC_LEN;
} else {
assert(var->list == NULL);
}
/*** Count number of variables ***/
var_count++;
}
/*** Count the number of characters between attributes. ***/
if (var_count > 0) {
size += (var_count - 1) * VAR_SEPARATOR_LEN;
}
/***** Create the string. *****/
build_str = (char *)malloc( size + 1);
if (build_str == NULL) {
return SLP_MEMORY_ALLOC_FAILED;
}
build_str[0] = '\0';
/***** Add values *****/
cur = build_str;
for (var = slp_attr->attrs; var != NULL; var = var->next) {
/*** Skip old attributes. ***/
if (find_delta == SLP_TRUE && var->modified == SLP_FALSE) {
continue;
}
if (var->type == SLP_KEYWORD) {
/**** Handle keywords. ****/
strcpy(cur, var->tag);
cur += var->tag_len;
} else {
/**** Handle everything else. ****/
char *to_add;
size_t to_add_len;
value_t *value;
/*** Add the prefix. ***/
strcpy(cur, VAR_PREFIX);
cur += VAR_PREFIX_LEN;
/*** Add the tag. ***/
strcpy(cur, var->tag);
cur += var->tag_len;
/*** Add the infix. ***/
strcpy(cur, VAR_INFIX);
cur += VAR_INFIX_LEN;
/*** Insert value (list) ***/
value = var->list;
assert(value);
while (value) { /* foreach member value of an attribute. */
assert(var->type != SLP_KEYWORD);
switch(var->type) {
case(SLP_BOOLEAN):
assert(value->next == NULL); /* Can't be a multivalued list. */
assert(value->data.va_bool == SLP_TRUE
|| value->data.va_bool == SLP_FALSE);
if (value->data.va_bool == SLP_TRUE) {
to_add = BOOL_TRUE_STR;
to_add_len = BOOL_TRUE_STR_LEN;
} else {
to_add = BOOL_FALSE_STR;
to_add_len = BOOL_FALSE_STR_LEN;
}
strcpy(cur, to_add);
cur += to_add_len;
break;
case(SLP_STRING):
cur = escape_into(cur, value->data.va_str, -1);
break;
case(SLP_INTEGER):
sprintf(cur, "%ld", value->data.va_int);
cur += value->escaped_len;
break;
case(SLP_OPAQUE):
strcpy(cur, OPAQUE_PREFIX);
cur += OPAQUE_PREFIX_LEN;
cur = escape_opaque_into(cur, value->data.va_str, value->unescaped_len);
break;
default:
printf("Unknown type (%s:%d).\n", __FILE__, __LINE__);
return SLP_INTERNAL_SYSTEM_ERROR;
}
value = value->next;
/*** Add separator (if necessary) ***/
if (value != NULL) {
strcpy(cur, VAR_SEPARATOR);
cur += VAR_SEPARATOR_LEN;
}
}
/*** Add the suffix. ***/
strcpy(cur, VAR_SUFFIX);
cur += VAR_SUFFIX_LEN;
}
/*** Add separator (if necessary) ***/
if (var->next != NULL) {
strcpy(cur, VAR_SEPARATOR);
cur += VAR_SEPARATOR_LEN;
}
/*** Reset the modified flag. ***/
var->modified = SLP_FALSE;
}
assert((cur - build_str) == size && size == strlen(build_str));
/***** Append a null (This is actually done by strcpy, but its better to
* be safe than sorry =) *****/
*cur = '\0';
*str = build_str;
return SLP_OK;
}
static netdev_tx_t ieee802154_xbee_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct ieee802154_mac_cb* cb;
int framelen, datalen;
char *frame;
struct xbee_priv *priv = netdev_priv(dev);
struct xbee_tx_header header = {
.length = 0x00,
.api_id = 0x00,
.frame_id = 0x02,
.options = 0x04
};
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
if(main_tty == NULL) {
printk(KERN_ALERT "No tty attached!\nMake sure ldisc_daemon is running\n");
return 0;
}
printk(KERN_ALERT "[NET tx called, %d bytes in sk_buff, pkt type %hu, protocol %hu]\n", skb->len, skb->pkt_type, skb->protocol);
cb = mac_cb(skb);
//header.address = cpu_to_be64(0x000000000000FFFF); // So far broadcast
header.address = cpu_to_be64p( (__be64*) &(cb->dest.extended_addr) );
printk(KERN_ALERT "MAC DST addr %llx\n", cb->dest.extended_addr);
header.length = cpu_to_be16(skb->len + 1 + 10);
datalen = skb->len + 1;
// Allocate buffer to hold entire serial frame, including start byte and checksum
frame = kmalloc(sizeof(struct xbee_tx_header) + (2*datalen) + 2, GFP_KERNEL);
/* Assemble the frame */
/* Escaping the XBee header */
printk(KERN_ALERT "Adding XBEE header- length is %lu\n", sizeof(header) + 1);
framelen = escape_into((frame + 1), &header, sizeof(header));
printk(KERN_ALERT "Adding data - length is %u\n", datalen);
framelen += escape_into((frame + framelen + 1 ), (skb->data), datalen );
framelen++; // Checksum char at the beginning
/* save the timestamp */
dev->trans_start = jiffies;
//Stop the interface from sending more data, get the spinlock, and send it!
netif_stop_queue(dev);
spin_lock(&priv->lock);
xbee_hw_tx(frame, framelen, dev);
//Free the skbuff, we've copied all the data out
dev_kfree_skb(skb);
spin_unlock(&priv->lock);
return NETDEV_TX_OK;
}
/*
* Copies bytes from one array into another, escaping them if necessary.
* Returns the size of the new array, including character escapes.
* The destination array MUST be at least twice the size of the source
*/
static int escape_into(char *dest, const void *srcarray, int len) {
int i, j=0;
const char *src = srcarray;
for(i=0; i<len; i++) {
char unesc = *(src + i);
// We support API mode 1 (escape characters is for API 2, if we want to enable mode 2 we need to implement escape management at RX)
if( unesc == 0x7D || unesc == 0x7E || unesc == 0x11 || unesc == 0x13) {
dest[j] = 0x7D;
dest[j+1] = unesc ^ 0x20;
j+=2;
} else {
dest[j] = unesc;
j++;
}
}
return j;
}