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

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Allocate all table names dynamically to allow for arbitrary lengths but
introduce NFT_NAME_MAXLEN as an upper sanity boundary. It's value was
chosen to allow using a domain name as per RFC 1035.

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 16:56:41 +02:00 committed by Pablo Neira Ayuso
parent 2cf0c8b3e6
commit e46abbcc05
4 changed files with 40 additions and 16 deletions
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2
include/net/netfilter/nf_tables.h
View File

@ -957,7 +957,7 @@ struct nft_table {
u32 use;
u16 flags:14,
genmask:2;
char name[NFT_TABLE_MAXNAMELEN];
char *name;
};
enum nft_af_flags {

3
include/uapi/linux/netfilter/nf_tables.h
View File

@ -1,7 +1,8 @@
#ifndef _LINUX_NF_TABLES_H
#define _LINUX_NF_TABLES_H
#define NFT_TABLE_MAXNAMELEN 32
#define NFT_NAME_MAXLEN 256
#define NFT_TABLE_MAXNAMELEN NFT_NAME_MAXLEN
#define NFT_CHAIN_MAXNAMELEN 32
#define NFT_SET_MAXNAMELEN 32
#define NFT_OBJ_MAXNAMELEN 32

49
net/netfilter/nf_tables_api.c
View File

@ -726,7 +726,10 @@ static int nf_tables_newtable(struct net *net, struct sock *nlsk,
if (table == NULL)
goto err2;
nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
table->name = nla_strdup(name, GFP_KERNEL);
if (table->name == NULL)
goto err3;
INIT_LIST_HEAD(&table->chains);
INIT_LIST_HEAD(&table->sets);
INIT_LIST_HEAD(&table->objects);
@ -735,10 +738,12 @@ static int nf_tables_newtable(struct net *net, struct sock *nlsk,
nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
if (err < 0)
goto err3;
goto err4;
list_add_tail_rcu(&table->list, &afi->tables);
return 0;
err4:
kfree(table->name);
err3:
kfree(table);
err2:
@ -865,6 +870,7 @@ static void nf_tables_table_destroy(struct nft_ctx *ctx)
{
BUG_ON(ctx->table->use > 0);
kfree(ctx->table->name);
kfree(ctx->table);
module_put(ctx->afi->owner);
}
@ -1972,7 +1978,7 @@ static void nf_tables_rule_notify(const struct nft_ctx *ctx,
}
struct nft_rule_dump_ctx {
char table[NFT_TABLE_MAXNAMELEN];
char *table;
char chain[NFT_CHAIN_MAXNAMELEN];
};
@ -1997,7 +2003,7 @@ static int nf_tables_dump_rules(struct sk_buff *skb,
continue;
list_for_each_entry_rcu(table, &afi->tables, list) {
if (ctx && ctx->table[0] &&
if (ctx && ctx->table &&
strcmp(ctx->table, table->name) != 0)
continue;
@ -2037,7 +2043,12 @@ static int nf_tables_dump_rules(struct sk_buff *skb,
static int nf_tables_dump_rules_done(struct netlink_callback *cb)
{
kfree(cb->data);
struct nft_rule_dump_ctx *ctx = cb->data;
if (ctx) {
kfree(ctx->table);
kfree(ctx);
}
return 0;
}
@ -2069,9 +2080,14 @@ static int nf_tables_getrule(struct net *net, struct sock *nlsk,
if (!ctx)
return -ENOMEM;
if (nla[NFTA_RULE_TABLE])
nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
sizeof(ctx->table));
if (nla[NFTA_RULE_TABLE]) {
ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
GFP_KERNEL);
if (!ctx->table) {
kfree(ctx);
return -ENOMEM;
}
}
if (nla[NFTA_RULE_CHAIN])
nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
sizeof(ctx->chain));
@ -4410,7 +4426,7 @@ static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
}
struct nft_obj_filter {
char table[NFT_OBJ_MAXNAMELEN];
char *table;
u32 type;
};
@ -4475,7 +4491,10 @@ static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
static int nf_tables_dump_obj_done(struct netlink_callback *cb)
{
kfree(cb->data);
struct nft_obj_filter *filter = cb->data;
kfree(filter->table);
kfree(filter);
return 0;
}
@ -4489,9 +4508,13 @@ nft_obj_filter_alloc(const struct nlattr * const nla[])
if (!filter)
return ERR_PTR(-ENOMEM);
if (nla[NFTA_OBJ_TABLE])
nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
NFT_TABLE_MAXNAMELEN);
if (nla[NFTA_OBJ_TABLE]) {
filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_KERNEL);
if (!filter->table) {
kfree(filter);
return ERR_PTR(-ENOMEM);
}
}
if (nla[NFTA_OBJ_TYPE])
filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));

2
net/netfilter/nf_tables_trace.c
View File

@ -175,7 +175,7 @@ void nft_trace_notify(struct nft_traceinfo *info)
return;
size = nlmsg_total_size(sizeof(struct nfgenmsg)) +
nla_total_size(NFT_TABLE_MAXNAMELEN) +
nla_total_size(strlen(info->chain->table->name)) +
nla_total_size(NFT_CHAIN_MAXNAMELEN) +
nla_total_size_64bit(sizeof(__be64)) + /* rule handle */
nla_total_size(sizeof(__be32)) + /* trace type */