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netfilter: nf_tables: allow to bind table to net_device

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This patch adds the internal NFT_AF_NEEDS_DEV flag to indicate that you must
attach this table to a net_device.

This change is required by the follow up patch that introduces the new netdev
table.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2015-05-26 18:41:20 +02:00
parent 529985de20
commit ebddf1a8d7
3 changed files with 51 additions and 5 deletions
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8
include/net/netfilter/nf_tables.h
View File

@ -819,6 +819,7 @@ unsigned int nft_do_chain(struct nft_pktinfo *pkt,
* @use: number of chain references to this table
* @flags: table flag (see enum nft_table_flags)
* @name: name of the table
* @dev: this table is bound to this device (if any)
*/
struct nft_table {
struct list_head list;
@ -828,6 +829,11 @@ struct nft_table {
u32 use;
u16 flags;
char name[NFT_TABLE_MAXNAMELEN];
struct net_device *dev;
};
enum nft_af_flags {
NFT_AF_NEEDS_DEV = (1 << 0),
};
/**
@ -838,6 +844,7 @@ struct nft_table {
* @nhooks: number of hooks in this family
* @owner: module owner
* @tables: used internally
* @flags: family flags
* @nops: number of hook ops in this family
* @hook_ops_init: initialization function for chain hook ops
* @hooks: hookfn overrides for packet validation
@ -848,6 +855,7 @@ struct nft_af_info {
unsigned int nhooks;
struct module *owner;
struct list_head tables;
u32 flags;
unsigned int nops;
void (*hook_ops_init)(struct nf_hook_ops *,
unsigned int);

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

@ -146,12 +146,14 @@ enum nft_table_flags {
* @NFTA_TABLE_NAME: name of the table (NLA_STRING)
* @NFTA_TABLE_FLAGS: bitmask of enum nft_table_flags (NLA_U32)
* @NFTA_TABLE_USE: number of chains in this table (NLA_U32)
* @NFTA_TABLE_DEV: net device name (NLA_STRING)
*/
enum nft_table_attributes {
NFTA_TABLE_UNSPEC,
NFTA_TABLE_NAME,
NFTA_TABLE_FLAGS,
NFTA_TABLE_USE,
NFTA_TABLE_DEV,
__NFTA_TABLE_MAX
};
#define NFTA_TABLE_MAX (__NFTA_TABLE_MAX - 1)

46
net/netfilter/nf_tables_api.c
View File

@ -399,6 +399,8 @@ static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
[NFTA_TABLE_NAME] = { .type = NLA_STRING,
.len = NFT_TABLE_MAXNAMELEN - 1 },
[NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
[NFTA_TABLE_DEV] = { .type = NLA_STRING,
.len = IFNAMSIZ - 1 },
};
static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
@ -423,6 +425,10 @@ static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
goto nla_put_failure;
if (table->dev &&
nla_put_string(skb, NFTA_TABLE_DEV, table->dev->name))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return 0;
@ -608,6 +614,11 @@ static int nf_tables_updtable(struct nft_ctx *ctx)
if (flags == ctx->table->flags)
return 0;
if ((ctx->afi->flags & NFT_AF_NEEDS_DEV) &&
ctx->nla[NFTA_TABLE_DEV] &&
nla_strcmp(ctx->nla[NFTA_TABLE_DEV], ctx->table->dev->name))
return -EOPNOTSUPP;
trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
sizeof(struct nft_trans_table));
if (trans == NULL)
@ -645,6 +656,7 @@ static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
struct nft_table *table;
struct net *net = sock_net(skb->sk);
int family = nfmsg->nfgen_family;
struct net_device *dev = NULL;
u32 flags = 0;
struct nft_ctx ctx;
int err;
@ -679,30 +691,50 @@ static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
return -EINVAL;
}
if (afi->flags & NFT_AF_NEEDS_DEV) {
char ifname[IFNAMSIZ];
if (!nla[NFTA_TABLE_DEV])
return -EOPNOTSUPP;
nla_strlcpy(ifname, nla[NFTA_TABLE_DEV], IFNAMSIZ);
dev = dev_get_by_name(net, ifname);
if (!dev)
return -ENOENT;
} else if (nla[NFTA_TABLE_DEV]) {
return -EOPNOTSUPP;
}
err = -EAFNOSUPPORT;
if (!try_module_get(afi->owner))
return -EAFNOSUPPORT;
goto err1;
err = -ENOMEM;
table = kzalloc(sizeof(*table), GFP_KERNEL);
if (table == NULL)
goto err1;
goto err2;
nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
INIT_LIST_HEAD(&table->chains);
INIT_LIST_HEAD(&table->sets);
table->flags = flags;
table->dev = dev;
nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
if (err < 0)
goto err2;
goto err3;
list_add_tail_rcu(&table->list, &afi->tables);
return 0;
err2:
err3:
kfree(table);
err1:
err2:
module_put(afi->owner);
err1:
if (dev != NULL)
dev_put(dev);
return err;
}
@ -806,6 +838,9 @@ static void nf_tables_table_destroy(struct nft_ctx *ctx)
{
BUG_ON(ctx->table->use > 0);
if (ctx->table->dev)
dev_put(ctx->table->dev);
kfree(ctx->table);
module_put(ctx->afi->owner);
}
@ -1361,6 +1396,7 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
ops->priority = priority;
ops->priv = chain;
ops->hook = afi->hooks[ops->hooknum];
ops->dev = table->dev;
if (hookfn)
ops->hook = hookfn;
if (afi->hook_ops_init)