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[NetLabel]: rework the Netlink attribute handling (part 1)

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At the suggestion of Thomas Graf, rewrite NetLabel's use of Netlink attributes
to better follow the common Netlink attribute usage.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Moore
2006-09-25 15:56:09 -07:00
committed by David S. Miller
parent 4fe5d5c07a
commit fcd4828064
7 changed files with 77 additions and 605 deletions
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183
net/netlabel/netlabel_domainhash.c
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@@ -354,160 +354,51 @@ struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain)
}
/**
* netlbl_domhsh_dump - Dump the domain hash table into a sk_buff
* netlbl_domhsh_walk - Iterate through the domain mapping hash table
* @skip_bkt: the number of buckets to skip at the start
* @skip_chain: the number of entries to skip in the first iterated bucket
* @callback: callback for each entry
* @cb_arg: argument for the callback function
*
* Description:
* Dump the domain hash table into a buffer suitable for returning to an
* application in response to a NetLabel management DOMAIN message. This
* function may fail if another process is growing the hash table at the same
* time. The returned sk_buff has room at the front of the sk_buff for
* @headroom bytes. See netlabel.h for the DOMAIN message format. Returns a
* pointer to a sk_buff on success, NULL on error.
* Interate over the domain mapping hash table, skipping the first @skip_bkt
* buckets and @skip_chain entries. For each entry in the table call
* @callback, if @callback returns a negative value stop 'walking' through the
* table and return. Updates the values in @skip_bkt and @skip_chain on
* return. Returns zero on succcess, negative values on failure.
*
*/
struct sk_buff *netlbl_domhsh_dump(size_t headroom)
int netlbl_domhsh_walk(u32 *skip_bkt,
u32 *skip_chain,
int (*callback) (struct netlbl_dom_map *entry, void *arg),
void *cb_arg)
{
struct sk_buff *skb = NULL;
ssize_t buf_len;
u32 bkt_iter;
u32 dom_cnt = 0;
struct netlbl_domhsh_tbl *hsh_tbl;
struct netlbl_dom_map *list_iter;
ssize_t tmp_len;
int ret_val = -ENOENT;
u32 iter_bkt;
struct netlbl_dom_map *iter_entry;
u32 chain_cnt = 0;
buf_len = NETLBL_LEN_U32;
rcu_read_lock();
hsh_tbl = rcu_dereference(netlbl_domhsh);
for (bkt_iter = 0; bkt_iter < hsh_tbl->size; bkt_iter++)
list_for_each_entry_rcu(list_iter,
&hsh_tbl->tbl[bkt_iter], list) {
buf_len += NETLBL_LEN_U32 +
nla_total_size(strlen(list_iter->domain) + 1);
switch (list_iter->type) {
case NETLBL_NLTYPE_UNLABELED:
break;
case NETLBL_NLTYPE_CIPSOV4:
buf_len += 2 * NETLBL_LEN_U32;
break;
for (iter_bkt = *skip_bkt;
iter_bkt < rcu_dereference(netlbl_domhsh)->size;
iter_bkt++, chain_cnt = 0) {
list_for_each_entry_rcu(iter_entry,
&netlbl_domhsh->tbl[iter_bkt],
list)
if (iter_entry->valid) {
if (chain_cnt++ < *skip_chain)
continue;
ret_val = callback(iter_entry, cb_arg);
if (ret_val < 0) {
chain_cnt--;
goto walk_return;
}
}
dom_cnt++;
}
}
skb = netlbl_netlink_alloc_skb(headroom, buf_len, GFP_ATOMIC);
if (skb == NULL)
goto dump_failure;
if (nla_put_u32(skb, NLA_U32, dom_cnt) != 0)
goto dump_failure;
buf_len -= NETLBL_LEN_U32;
hsh_tbl = rcu_dereference(netlbl_domhsh);
for (bkt_iter = 0; bkt_iter < hsh_tbl->size; bkt_iter++)
list_for_each_entry_rcu(list_iter,
&hsh_tbl->tbl[bkt_iter], list) {
tmp_len = nla_total_size(strlen(list_iter->domain) +
1);
if (buf_len < NETLBL_LEN_U32 + tmp_len)
goto dump_failure;
if (nla_put_string(skb,
NLA_STRING,
list_iter->domain) != 0)
goto dump_failure;
if (nla_put_u32(skb, NLA_U32, list_iter->type) != 0)
goto dump_failure;
buf_len -= NETLBL_LEN_U32 + tmp_len;
switch (list_iter->type) {
case NETLBL_NLTYPE_UNLABELED:
break;
case NETLBL_NLTYPE_CIPSOV4:
if (buf_len < 2 * NETLBL_LEN_U32)
goto dump_failure;
if (nla_put_u32(skb,
NLA_U32,
list_iter->type_def.cipsov4->type) != 0)
goto dump_failure;
if (nla_put_u32(skb,
NLA_U32,
list_iter->type_def.cipsov4->doi) != 0)
goto dump_failure;
buf_len -= 2 * NETLBL_LEN_U32;
break;
}
}
walk_return:
rcu_read_unlock();
return skb;
dump_failure:
rcu_read_unlock();
kfree_skb(skb);
return NULL;
}
/**
* netlbl_domhsh_dump_default - Dump the default domain mapping into a sk_buff
*
* Description:
* Dump the default domain mapping into a buffer suitable for returning to an
* application in response to a NetLabel management DEFDOMAIN message. This
* function may fail if another process is changing the default domain mapping
* at the same time. The returned sk_buff has room at the front of the
* skb_buff for @headroom bytes. See netlabel.h for the DEFDOMAIN message
* format. Returns a pointer to a sk_buff on success, NULL on error.
*
*/
struct sk_buff *netlbl_domhsh_dump_default(size_t headroom)
{
struct sk_buff *skb;
ssize_t buf_len;
struct netlbl_dom_map *entry;
buf_len = NETLBL_LEN_U32;
rcu_read_lock();
entry = rcu_dereference(netlbl_domhsh_def);
if (entry != NULL)
switch (entry->type) {
case NETLBL_NLTYPE_UNLABELED:
break;
case NETLBL_NLTYPE_CIPSOV4:
buf_len += 2 * NETLBL_LEN_U32;
break;
}
skb = netlbl_netlink_alloc_skb(headroom, buf_len, GFP_ATOMIC);
if (skb == NULL)
goto dump_default_failure;
if (entry != rcu_dereference(netlbl_domhsh_def))
goto dump_default_failure;
if (entry != NULL) {
if (nla_put_u32(skb, NLA_U32, entry->type) != 0)
goto dump_default_failure;
buf_len -= NETLBL_LEN_U32;
switch (entry->type) {
case NETLBL_NLTYPE_UNLABELED:
break;
case NETLBL_NLTYPE_CIPSOV4:
if (buf_len < 2 * NETLBL_LEN_U32)
goto dump_default_failure;
if (nla_put_u32(skb,
NLA_U32,
entry->type_def.cipsov4->type) != 0)
goto dump_default_failure;
if (nla_put_u32(skb,
NLA_U32,
entry->type_def.cipsov4->doi) != 0)
goto dump_default_failure;
buf_len -= 2 * NETLBL_LEN_U32;
break;
}
} else
nla_put_u32(skb, NLA_U32, NETLBL_NLTYPE_NONE);
rcu_read_unlock();
return skb;
dump_default_failure:
rcu_read_unlock();
kfree_skb(skb);
return NULL;
*skip_bkt = iter_bkt;
*skip_chain = chain_cnt;
return ret_val;
}