static int
bridge_read_fdb(const char *bridge, struct fdb_entry *fdbs, unsigned long offset, int num)
{
FILE *f;
int i, n;
struct __fdb_entry fe[num];
char path[256];
snprintf(path, 256, "/sys/class/net/%s/brforward", bridge);
f = fopen(path, "r");
if (f) {
fseek(f, offset*sizeof(struct __fdb_entry), SEEK_SET);
n = fread(fe, sizeof(struct __fdb_entry), num, f);
fclose(f);
}
for (i = 0; i < n; i++)
copy_fdb(fdbs+i, fe+i);
return n;
}
int br_fdb_get_entries(struct net_bridge *br,
unsigned char *_buf,
int maxnum,
int offset)
{
int i;
int num;
struct __fdb_entry *walk;
num = 0;
walk = (struct __fdb_entry *)_buf;
read_lock_bh(&br->hash_lock);
for (i=0;i<BR_HASH_SIZE;i++) {
struct net_bridge_fdb_entry *f;
f = br->hash[i];
while (f != NULL && num < maxnum) {
struct __fdb_entry ent;
int err;
struct net_bridge_fdb_entry *g;
struct net_bridge_fdb_entry **pp;
if (has_expired(br, f)) {
f = f->next_hash;
continue;
}
if (offset) {
offset--;
f = f->next_hash;
continue;
}
copy_fdb(&ent, f);
atomic_inc(&f->use_count);
read_unlock_bh(&br->hash_lock);
err = copy_to_user(walk, &ent, sizeof(struct __fdb_entry));
read_lock_bh(&br->hash_lock);
g = f->next_hash;
pp = f->pprev_hash;
br_fdb_put(f);
if (err)
goto out_fault;
if (g == NULL && pp == NULL)
goto out_disappeared;
num++;
walk++;
f = g;
}
}
out:
read_unlock_bh(&br->hash_lock);
return num;
out_disappeared:
num = -EAGAIN;
goto out;
out_fault:
num = -EFAULT;
goto out;
}
