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netfilter: nf_tables: add NFTA_CHAIN_ID attribute

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This netlink attribute allows you to refer to chains inside a
transaction as an alternative to the name and the handle. The chain
binding support requires this new chain ID approach.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2020-06-30 19:21:11 +02:00
parent f0a5e4d7a5
commit 74cccc3d38
3 changed files with 17 additions and 3 deletions
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3
include/net/netfilter/nf_tables.h
View File

@ -1433,6 +1433,7 @@ struct nft_trans_chain {
char *name;
struct nft_stats __percpu *stats;
u8 policy;
u32 chain_id;
};
#define nft_trans_chain_update(trans) \
@ -1443,6 +1444,8 @@ struct nft_trans_chain {
(((struct nft_trans_chain *)trans->data)->stats)
#define nft_trans_chain_policy(trans) \
(((struct nft_trans_chain *)trans->data)->policy)
#define nft_trans_chain_id(trans) \
(((struct nft_trans_chain *)trans->data)->chain_id)
struct nft_trans_table {
bool update;

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

@ -196,6 +196,7 @@ enum nft_table_attributes {
* @NFTA_CHAIN_TYPE: type name of the string (NLA_NUL_STRING)
* @NFTA_CHAIN_COUNTERS: counter specification of the chain (NLA_NESTED: nft_counter_attributes)
* @NFTA_CHAIN_FLAGS: chain flags
* @NFTA_CHAIN_ID: uniquely identifies a chain in a transaction (NLA_U32)
*/
enum nft_chain_attributes {
NFTA_CHAIN_UNSPEC,
@ -209,6 +210,7 @@ enum nft_chain_attributes {
NFTA_CHAIN_COUNTERS,
NFTA_CHAIN_PAD,
NFTA_CHAIN_FLAGS,
NFTA_CHAIN_ID,
__NFTA_CHAIN_MAX
};
#define NFTA_CHAIN_MAX (__NFTA_CHAIN_MAX - 1)

15
net/netfilter/nf_tables_api.c
View File

@ -280,9 +280,15 @@ static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
if (trans == NULL)
return ERR_PTR(-ENOMEM);
if (msg_type == NFT_MSG_NEWCHAIN)
if (msg_type == NFT_MSG_NEWCHAIN) {
nft_activate_next(ctx->net, ctx->chain);
if (ctx->nla[NFTA_CHAIN_ID]) {
nft_trans_chain_id(trans) =
ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
}
}
list_add_tail(&trans->list, &ctx->net->nft.commit_list);
return trans;
}
@ -1274,6 +1280,7 @@ static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
.len = NFT_MODULE_AUTOLOAD_LIMIT },
[NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
[NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
[NFTA_CHAIN_ID] = { .type = NLA_U32 },
};
static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
@ -2154,9 +2161,9 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk,
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
u8 genmask = nft_genmask_next(net);
int family = nfmsg->nfgen_family;
struct nft_chain *chain = NULL;
const struct nlattr *attr;
struct nft_table *table;
struct nft_chain *chain;
u8 policy = NF_ACCEPT;
struct nft_ctx ctx;
u64 handle = 0;
@ -2181,7 +2188,7 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk,
return PTR_ERR(chain);
}
attr = nla[NFTA_CHAIN_HANDLE];
} else {
} else if (nla[NFTA_CHAIN_NAME]) {
chain = nft_chain_lookup(net, table, attr, genmask);
if (IS_ERR(chain)) {
if (PTR_ERR(chain) != -ENOENT) {
@ -2190,6 +2197,8 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk,
}
chain = NULL;
}
} else if (!nla[NFTA_CHAIN_ID]) {
return -EINVAL;
}
if (nla[NFTA_CHAIN_POLICY]) {