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netfilter: nf_tables: Allow set names of up to 255 chars 

Same conversion as for table names, use NFT_NAME_MAXLEN as upper
boundary as well.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Phil Sutter 2017-07-27 16:56:43 +02:00 committed by Pablo Neira Ayuso
parent b7263e071a
commit 387454901b
3 changed files with 16 additions and 6 deletions
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2
include/net/netfilter/nf_tables.h
View File

@ -396,7 +396,7 @@ void nft_unregister_set(struct nft_set_type *type);
struct nft_set {
struct list_head list;
struct list_head bindings;
char name[NFT_SET_MAXNAMELEN];
char *name;
u32 ktype;
u32 dtype;
u32 objtype;

2
include/uapi/linux/netfilter/nf_tables.h
View File

@ -4,7 +4,7 @@
#define NFT_NAME_MAXLEN 256
#define NFT_TABLE_MAXNAMELEN NFT_NAME_MAXLEN
#define NFT_CHAIN_MAXNAMELEN NFT_NAME_MAXLEN
#define NFT_SET_MAXNAMELEN 32
#define NFT_SET_MAXNAMELEN NFT_NAME_MAXLEN
#define NFT_OBJ_MAXNAMELEN 32
#define NFT_USERDATA_MAXLEN 256

18
net/netfilter/nf_tables_api.c
View File

@ -2650,7 +2650,7 @@ static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
unsigned long *inuse;
unsigned int n = 0, min = 0;
p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
p = strchr(name, '%');
if (p != NULL) {
if (p[1] != 'd' || strchr(p + 2, '%'))
return -EINVAL;
@ -2681,7 +2681,10 @@ cont:
free_page((unsigned long)inuse);
}
snprintf(set->name, sizeof(set->name), name, min + n);
set->name = kasprintf(GFP_KERNEL, name, min + n);
if (!set->name)
return -ENOMEM;
list_for_each_entry(i, &ctx->table->sets, list) {
if (!nft_is_active_next(ctx->net, i))
continue;
@ -2958,7 +2961,7 @@ static int nf_tables_newset(struct net *net, struct sock *nlsk,
struct nft_table *table;
struct nft_set *set;
struct nft_ctx ctx;
char name[NFT_SET_MAXNAMELEN];
char *name;
unsigned int size;
bool create;
u64 timeout;
@ -3104,8 +3107,14 @@ static int nf_tables_newset(struct net *net, struct sock *nlsk,
goto err1;
}
nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
if (!name) {
err = -ENOMEM;
goto err2;
}
err = nf_tables_set_alloc_name(&ctx, set, name);
kfree(name);
if (err < 0)
goto err2;
@ -3155,6 +3164,7 @@ static void nft_set_destroy(struct nft_set *set)
{
set->ops->destroy(set);
module_put(set->ops->type->owner);
kfree(set->name);
kvfree(set);
}