AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-13 19:46:40 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

netfilter: nf_conncount: expose connection list interface

Browse Source 
This patch provides an interface to maintain the list of connections and
the lookup function to obtain the number of connections in the list.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2018-06-02 23:38:47 +02:00
parent 00bfb3205e
commit 5e5cbc7b23
2 changed files with 34 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/net/netfilter/nf_conntrack_count.h
View File

@ -13,4 +13,15 @@ unsigned int nf_conncount_count(struct net *net,
const u32 *key,
const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_zone *zone);
unsigned int nf_conncount_lookup(struct net *net, struct hlist_head *head,
const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_zone *zone,
bool *addit);
bool nf_conncount_add(struct hlist_head *head,
const struct nf_conntrack_tuple *tuple);
void nf_conncount_cache_free(struct hlist_head *hhead);
#endif

36
net/netfilter/nf_conncount.c
View File

@ -79,7 +79,7 @@ static int key_diff(const u32 *a, const u32 *b, unsigned int klen)
return memcmp(a, b, klen * sizeof(u32));
}
static bool add_hlist(struct hlist_head *head,
bool nf_conncount_add(struct hlist_head *head,
const struct nf_conntrack_tuple *tuple)
{
struct nf_conncount_tuple *conn;
@ -91,12 +91,12 @@ static bool add_hlist(struct hlist_head *head,
hlist_add_head(&conn->node, head);
return true;
}
EXPORT_SYMBOL_GPL(nf_conncount_add);
static unsigned int check_hlist(struct net *net,
struct hlist_head *head,
const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_zone *zone,
bool *addit)
unsigned int nf_conncount_lookup(struct net *net, struct hlist_head *head,
const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_zone *zone,
bool *addit)
{
const struct nf_conntrack_tuple_hash *found;
struct nf_conncount_tuple *conn;
@ -141,6 +141,7 @@ static unsigned int check_hlist(struct net *net,
return length;
}
EXPORT_SYMBOL_GPL(nf_conncount_lookup);
static void tree_nodes_free(struct rb_root *root,
struct nf_conncount_rb *gc_nodes[],
@ -187,13 +188,15 @@ count_tree(struct net *net, struct rb_root *root,
} else {
/* same source network -> be counted! */
unsigned int count;
count = check_hlist(net, &rbconn->hhead, tuple, zone, &addit);
count = nf_conncount_lookup(net, &rbconn->hhead, tuple,
zone, &addit);
tree_nodes_free(root, gc_nodes, gc_count);
if (!addit)
return count;
if (!add_hlist(&rbconn->hhead, tuple))
if (!nf_conncount_add(&rbconn->hhead, tuple))
return 0; /* hotdrop */
return count + 1;
@ -203,7 +206,7 @@ count_tree(struct net *net, struct rb_root *root,
continue;
/* only used for GC on hhead, retval and 'addit' ignored */
check_hlist(net, &rbconn->hhead, tuple, zone, &addit);
nf_conncount_lookup(net, &rbconn->hhead, tuple, zone, &addit);
if (hlist_empty(&rbconn->hhead))
gc_nodes[gc_count++] = rbconn;
}
@ -303,11 +306,19 @@ struct nf_conncount_data *nf_conncount_init(struct net *net, unsigned int family
}
EXPORT_SYMBOL_GPL(nf_conncount_init);
static void destroy_tree(struct rb_root *r)
void nf_conncount_cache_free(struct hlist_head *hhead)
{
struct nf_conncount_tuple *conn;
struct nf_conncount_rb *rbconn;
struct hlist_node *n;
hlist_for_each_entry_safe(conn, n, hhead, node)
kmem_cache_free(conncount_conn_cachep, conn);
}
EXPORT_SYMBOL_GPL(nf_conncount_cache_free);
static void destroy_tree(struct rb_root *r)
{
struct nf_conncount_rb *rbconn;
struct rb_node *node;
while ((node = rb_first(r)) != NULL) {
@ -315,8 +326,7 @@ static void destroy_tree(struct rb_root *r)
rb_erase(node, r);
hlist_for_each_entry_safe(conn, n, &rbconn->hhead, node)
kmem_cache_free(conncount_conn_cachep, conn);
nf_conncount_cache_free(&rbconn->hhead);
kmem_cache_free(conncount_rb_cachep, rbconn);
}