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netfilter: nf_tables: add generation mask to chains
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Similar to ("netfilter: nf_tables: add generation mask to tables").

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Pablo Neira Ayuso committed Jun 24, 2016
1 parent f2a6d76 commit 664b0f8
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Showing 2 changed files with 60 additions and 33 deletions.
4 changes: 2 additions & 2 deletions include/net/netfilter/nf_tables.h
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Original file line number Diff line number Diff line change
Expand Up @@ -732,7 +732,6 @@ static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)

enum nft_chain_flags {
NFT_BASE_CHAIN = 0x1,
NFT_CHAIN_INACTIVE = 0x2,
};

/**
Expand All @@ -754,7 +753,8 @@ struct nft_chain {
u64 handle;
u32 use;
u16 level;
u8 flags;
u8 flags:6,
genmask:2;
char name[NFT_CHAIN_MAXNAMELEN];
};

Expand Down
89 changes: 58 additions & 31 deletions net/netfilter/nf_tables_api.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -211,7 +211,7 @@ static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
return -ENOMEM;

if (msg_type == NFT_MSG_NEWCHAIN)
ctx->chain->flags |= NFT_CHAIN_INACTIVE;
nft_activate_next(ctx->net, ctx->chain);

list_add_tail(&trans->list, &ctx->net->nft.commit_list);
return 0;
Expand All @@ -226,7 +226,7 @@ static int nft_delchain(struct nft_ctx *ctx)
return err;

ctx->table->use--;
list_del_rcu(&ctx->chain->list);
nft_deactivate_next(ctx->net, ctx->chain);

return err;
}
Expand Down Expand Up @@ -559,13 +559,16 @@ static int nf_tables_gettable(struct net *net, struct sock *nlsk,
return err;
}

static int nf_tables_table_enable(const struct nft_af_info *afi,
static int nf_tables_table_enable(struct net *net,
const struct nft_af_info *afi,
struct nft_table *table)
{
struct nft_chain *chain;
int err, i = 0;

list_for_each_entry(chain, &table->chains, list) {
if (!nft_is_active_next(net, chain))
continue;
if (!(chain->flags & NFT_BASE_CHAIN))
continue;

Expand All @@ -578,6 +581,8 @@ static int nf_tables_table_enable(const struct nft_af_info *afi,
return 0;
err:
list_for_each_entry(chain, &table->chains, list) {
if (!nft_is_active_next(net, chain))
continue;
if (!(chain->flags & NFT_BASE_CHAIN))
continue;

Expand All @@ -589,12 +594,15 @@ static int nf_tables_table_enable(const struct nft_af_info *afi,
return err;
}

static void nf_tables_table_disable(const struct nft_af_info *afi,
static void nf_tables_table_disable(struct net *net,
const struct nft_af_info *afi,
struct nft_table *table)
{
struct nft_chain *chain;

list_for_each_entry(chain, &table->chains, list) {
if (!nft_is_active_next(net, chain))
continue;
if (chain->flags & NFT_BASE_CHAIN)
nft_unregister_basechain(nft_base_chain(chain),
afi->nops);
Expand Down Expand Up @@ -627,7 +635,7 @@ static int nf_tables_updtable(struct nft_ctx *ctx)
nft_trans_table_enable(trans) = false;
} else if (!(flags & NFT_TABLE_F_DORMANT) &&
ctx->table->flags & NFT_TABLE_F_DORMANT) {
ret = nf_tables_table_enable(ctx->afi, ctx->table);
ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
if (ret >= 0) {
ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
nft_trans_table_enable(trans) = true;
Expand Down Expand Up @@ -722,6 +730,9 @@ static int nft_flush_table(struct nft_ctx *ctx)
struct nft_set *set, *ns;

list_for_each_entry(chain, &ctx->table->chains, list) {
if (!nft_is_active_next(ctx->net, chain))
continue;

ctx->chain = chain;

err = nft_delrule_by_chain(ctx);
Expand All @@ -740,6 +751,9 @@ static int nft_flush_table(struct nft_ctx *ctx)
}

list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
if (!nft_is_active_next(ctx->net, chain))
continue;

ctx->chain = chain;

err = nft_delchain(ctx);
Expand Down Expand Up @@ -849,28 +863,32 @@ EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
*/

static struct nft_chain *
nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
u8 genmask)
{
struct nft_chain *chain;

list_for_each_entry(chain, &table->chains, list) {
if (chain->handle == handle)
if (chain->handle == handle &&
nft_active_genmask(chain, genmask))
return chain;
}

return ERR_PTR(-ENOENT);
}

static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
const struct nlattr *nla)
const struct nlattr *nla,
u8 genmask)
{
struct nft_chain *chain;

if (nla == NULL)
return ERR_PTR(-EINVAL);

list_for_each_entry(chain, &table->chains, list) {
if (!nla_strcmp(nla, chain->name))
if (!nla_strcmp(nla, chain->name) &&
nft_active_genmask(chain, genmask))
return chain;
}

Expand Down Expand Up @@ -1053,6 +1071,8 @@ static int nf_tables_dump_chains(struct sk_buff *skb,
if (idx > s_idx)
memset(&cb->args[1], 0,
sizeof(cb->args) - sizeof(cb->args[0]));
if (!nft_is_active(net, chain))
continue;
if (nf_tables_fill_chain_info(skb, net,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
Expand Down Expand Up @@ -1101,11 +1121,9 @@ static int nf_tables_getchain(struct net *net, struct sock *nlsk,
if (IS_ERR(table))
return PTR_ERR(table);

chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
if (IS_ERR(chain))
return PTR_ERR(chain);
if (chain->flags & NFT_CHAIN_INACTIVE)
return -ENOENT;

skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb2)
Expand Down Expand Up @@ -1230,11 +1248,11 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk,

if (nla[NFTA_CHAIN_HANDLE]) {
handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
chain = nf_tables_chain_lookup_byhandle(table, handle);
chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
if (IS_ERR(chain))
return PTR_ERR(chain);
} else {
chain = nf_tables_chain_lookup(table, name);
chain = nf_tables_chain_lookup(table, name, genmask);
if (IS_ERR(chain)) {
if (PTR_ERR(chain) != -ENOENT)
return PTR_ERR(chain);
Expand Down Expand Up @@ -1265,16 +1283,20 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk,
struct nft_stats *stats = NULL;
struct nft_trans *trans;

if (chain->flags & NFT_CHAIN_INACTIVE)
return -ENOENT;
if (nlh->nlmsg_flags & NLM_F_EXCL)
return -EEXIST;
if (nlh->nlmsg_flags & NLM_F_REPLACE)
return -EOPNOTSUPP;

if (nla[NFTA_CHAIN_HANDLE] && name &&
!IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
return -EEXIST;
if (nla[NFTA_CHAIN_HANDLE] && name) {
struct nft_chain *chain2;

chain2 = nf_tables_chain_lookup(table,
nla[NFTA_CHAIN_NAME],
genmask);
if (IS_ERR(chain2))
return PTR_ERR(chain2);
}

if (nla[NFTA_CHAIN_COUNTERS]) {
if (!(chain->flags & NFT_BASE_CHAIN))
Expand Down Expand Up @@ -1468,7 +1490,7 @@ static int nf_tables_delchain(struct net *net, struct sock *nlsk,
if (IS_ERR(table))
return PTR_ERR(table);

chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
if (IS_ERR(chain))
return PTR_ERR(chain);
if (chain->use > 0)
Expand Down Expand Up @@ -1930,11 +1952,9 @@ static int nf_tables_getrule(struct net *net, struct sock *nlsk,
if (IS_ERR(table))
return PTR_ERR(table);

chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
if (IS_ERR(chain))
return PTR_ERR(chain);
if (chain->flags & NFT_CHAIN_INACTIVE)
return -ENOENT;

rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
if (IS_ERR(rule))
Expand Down Expand Up @@ -2008,7 +2028,7 @@ static int nf_tables_newrule(struct net *net, struct sock *nlsk,
if (IS_ERR(table))
return PTR_ERR(table);

chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
if (IS_ERR(chain))
return PTR_ERR(chain);

Expand Down Expand Up @@ -2166,7 +2186,8 @@ static int nf_tables_delrule(struct net *net, struct sock *nlsk,
return PTR_ERR(table);

if (nla[NFTA_RULE_CHAIN]) {
chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
genmask);
if (IS_ERR(chain))
return PTR_ERR(chain);
}
Expand All @@ -2186,6 +2207,9 @@ static int nf_tables_delrule(struct net *net, struct sock *nlsk,
}
} else {
list_for_each_entry(chain, &table->chains, list) {
if (!nft_is_active_next(net, chain))
continue;

ctx.chain = chain;
err = nft_delrule_by_chain(&ctx);
if (err < 0)
Expand Down Expand Up @@ -3934,7 +3958,8 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
case NFT_MSG_NEWTABLE:
if (nft_trans_table_update(trans)) {
if (!nft_trans_table_enable(trans)) {
nf_tables_table_disable(trans->ctx.afi,
nf_tables_table_disable(net,
trans->ctx.afi,
trans->ctx.table);
trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
}
Expand All @@ -3952,12 +3977,13 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
if (nft_trans_chain_update(trans))
nft_chain_commit_update(trans);
else
trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
nft_clear(net, trans->ctx.chain);

nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
nft_trans_destroy(trans);
break;
case NFT_MSG_DELCHAIN:
list_del_rcu(&trans->ctx.chain->list);
nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
nf_tables_unregister_hooks(trans->ctx.table,
trans->ctx.chain,
Expand Down Expand Up @@ -4061,7 +4087,8 @@ static int nf_tables_abort(struct net *net, struct sk_buff *skb)
case NFT_MSG_NEWTABLE:
if (nft_trans_table_update(trans)) {
if (nft_trans_table_enable(trans)) {
nf_tables_table_disable(trans->ctx.afi,
nf_tables_table_disable(net,
trans->ctx.afi,
trans->ctx.table);
trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
}
Expand Down Expand Up @@ -4089,8 +4116,7 @@ static int nf_tables_abort(struct net *net, struct sk_buff *skb)
break;
case NFT_MSG_DELCHAIN:
trans->ctx.table->use++;
list_add_tail_rcu(&trans->ctx.chain->list,
&trans->ctx.table->chains);
nft_clear(trans->ctx.net, trans->ctx.chain);
nft_trans_destroy(trans);
break;
case NFT_MSG_NEWRULE:
Expand Down Expand Up @@ -4413,6 +4439,7 @@ static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
struct nft_data_desc *desc, const struct nlattr *nla)
{
u8 genmask = nft_genmask_next(ctx->net);
struct nlattr *tb[NFTA_VERDICT_MAX + 1];
struct nft_chain *chain;
int err;
Expand Down Expand Up @@ -4445,7 +4472,7 @@ static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
if (!tb[NFTA_VERDICT_CHAIN])
return -EINVAL;
chain = nf_tables_chain_lookup(ctx->table,
tb[NFTA_VERDICT_CHAIN]);
tb[NFTA_VERDICT_CHAIN], genmask);
if (IS_ERR(chain))
return PTR_ERR(chain);
if (chain->flags & NFT_BASE_CHAIN)
Expand Down

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