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netfilter: nf_tables: Allow chain name 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 16:56:42 +02:00 committed by Pablo Neira Ayuso
parent e46abbcc05
commit b7263e071a
4 changed files with 54 additions and 13 deletions
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4
include/net/netfilter/nf_tables.h
View File

@ -859,7 +859,7 @@ struct nft_chain {
u16 level;
u8 flags:6,
genmask:2;
char name[NFT_CHAIN_MAXNAMELEN];
char *name;
};
enum nft_chain_type {
@ -1272,7 +1272,7 @@ struct nft_trans_set {
struct nft_trans_chain {
bool update;
char name[NFT_CHAIN_MAXNAMELEN];
char *name;
struct nft_stats __percpu *stats;
u8 policy;
};

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

@ -3,7 +3,7 @@
#define NFT_NAME_MAXLEN 256
#define NFT_TABLE_MAXNAMELEN NFT_NAME_MAXLEN
#define NFT_CHAIN_MAXNAMELEN 32
#define NFT_CHAIN_MAXNAMELEN NFT_NAME_MAXLEN
#define NFT_SET_MAXNAMELEN 32
#define NFT_OBJ_MAXNAMELEN 32
#define NFT_USERDATA_MAXLEN 256

34
net/netfilter/nf_tables_api.c
View File

@ -1250,8 +1250,10 @@ static void nf_tables_chain_destroy(struct nft_chain *chain)
static_branch_dec(&nft_counters_enabled);
if (basechain->ops[0].dev != NULL)
dev_put(basechain->ops[0].dev);
kfree(chain->name);
kfree(basechain);
} else {
kfree(chain->name);
kfree(chain);
}
}
@ -1476,8 +1478,13 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk,
nft_trans_chain_policy(trans) = -1;
if (nla[NFTA_CHAIN_HANDLE] && name) {
nla_strlcpy(nft_trans_chain_name(trans), name,
NFT_CHAIN_MAXNAMELEN);
nft_trans_chain_name(trans) =
nla_strdup(name, GFP_KERNEL);
if (!nft_trans_chain_name(trans)) {
kfree(trans);
free_percpu(stats);
return -ENOMEM;
}
}
list_add_tail(&trans->list, &net->nft.commit_list);
return 0;
@ -1544,7 +1551,11 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk,
INIT_LIST_HEAD(&chain->rules);
chain->handle = nf_tables_alloc_handle(table);
chain->table = table;
nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
chain->name = nla_strdup(name, GFP_KERNEL);
if (!chain->name) {
err = -ENOMEM;
goto err1;
}
err = nf_tables_register_hooks(net, table, chain, afi->nops);
if (err < 0)
@ -1979,7 +1990,7 @@ static void nf_tables_rule_notify(const struct nft_ctx *ctx,
struct nft_rule_dump_ctx {
char *table;
char chain[NFT_CHAIN_MAXNAMELEN];
char *chain;
};
static int nf_tables_dump_rules(struct sk_buff *skb,
@ -2047,6 +2058,7 @@ static int nf_tables_dump_rules_done(struct netlink_callback *cb)
if (ctx) {
kfree(ctx->table);
kfree(ctx->chain);
kfree(ctx);
}
return 0;
@ -2088,9 +2100,15 @@ static int nf_tables_getrule(struct net *net, struct sock *nlsk,
return -ENOMEM;
}
}
if (nla[NFTA_RULE_CHAIN])
nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
sizeof(ctx->chain));
if (nla[NFTA_RULE_CHAIN]) {
ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
GFP_KERNEL);
if (!ctx->chain) {
kfree(ctx->table);
kfree(ctx);
return -ENOMEM;
}
}
c.data = ctx;
}
@ -4863,7 +4881,7 @@ static void nft_chain_commit_update(struct nft_trans *trans)
{
struct nft_base_chain *basechain;
if (nft_trans_chain_name(trans)[0])
if (nft_trans_chain_name(trans))
strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
if (!nft_is_base_chain(trans->ctx.chain))

27
net/netfilter/nf_tables_trace.c
View File

@ -162,6 +162,27 @@ static int nf_trace_fill_rule_info(struct sk_buff *nlskb,
NFTA_TRACE_PAD);
}
static bool nft_trace_have_verdict_chain(struct nft_traceinfo *info)
{
switch (info->type) {
case NFT_TRACETYPE_RETURN:
case NFT_TRACETYPE_RULE:
break;
default:
return false;
}
switch (info->verdict->code) {
case NFT_JUMP:
case NFT_GOTO:
break;
default:
return false;
}
return true;
}
void nft_trace_notify(struct nft_traceinfo *info)
{
const struct nft_pktinfo *pkt = info->pkt;
@ -176,12 +197,11 @@ void nft_trace_notify(struct nft_traceinfo *info)
size = nlmsg_total_size(sizeof(struct nfgenmsg)) +
nla_total_size(strlen(info->chain->table->name)) +
nla_total_size(NFT_CHAIN_MAXNAMELEN) +
nla_total_size(strlen(info->chain->name)) +
nla_total_size_64bit(sizeof(__be64)) + /* rule handle */
nla_total_size(sizeof(__be32)) + /* trace type */
nla_total_size(0) + /* VERDICT, nested */
nla_total_size(sizeof(u32)) + /* verdict code */
nla_total_size(NFT_CHAIN_MAXNAMELEN) + /* jump target */
nla_total_size(sizeof(u32)) + /* id */
nla_total_size(NFT_TRACETYPE_LL_HSIZE) +
nla_total_size(NFT_TRACETYPE_NETWORK_HSIZE) +
@ -194,6 +214,9 @@ void nft_trace_notify(struct nft_traceinfo *info)
nla_total_size(sizeof(u32)) + /* nfproto */
nla_total_size(sizeof(u32)); /* policy */
if (nft_trace_have_verdict_chain(info))
size += nla_total_size(strlen(info->verdict->chain->name)); /* jump target */
skb = nlmsg_new(size, GFP_ATOMIC);
if (!skb)
return;