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netfilter: nf_tables: add generation mask to sets

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

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2016-06-12 22:52:45 +02:00
parent 664b0f8cd8
commit 37a9cc5255
4 changed files with 54 additions and 35 deletions
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8
include/net/netfilter/nf_tables.h
View File

@ -296,6 +296,7 @@ void nft_unregister_set(struct nft_set_ops *ops);
* @ops: set ops * @ops: set ops
* @pnet: network namespace * @pnet: network namespace
* @flags: set flags * @flags: set flags
* @genmask: generation mask
* @klen: key length * @klen: key length
* @dlen: data length * @dlen: data length
* @data: private set data * @data: private set data
@ -317,7 +318,8 @@ struct nft_set {
/* runtime data below here */ /* runtime data below here */
const struct nft_set_ops *ops ____cacheline_aligned; const struct nft_set_ops *ops ____cacheline_aligned;
possible_net_t pnet; possible_net_t pnet;
u16 flags; u16 flags:14,
genmask:2;
u8 klen; u8 klen;
u8 dlen; u8 dlen;
unsigned char data[] unsigned char data[]
@ -335,9 +337,9 @@ static inline struct nft_set *nft_set_container_of(const void *priv)
} }
struct nft_set *nf_tables_set_lookup(const struct nft_table *table, struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
const struct nlattr *nla); const struct nlattr *nla, u8 genmask);
struct nft_set *nf_tables_set_lookup_byid(const struct net *net, struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
const struct nlattr *nla); const struct nlattr *nla, u8 genmask);
static inline unsigned long nft_set_gc_interval(const struct nft_set *set) static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
{ {

68
net/netfilter/nf_tables_api.c
View File

@ -289,9 +289,6 @@ static int nft_delrule_by_chain(struct nft_ctx *ctx)
return 0; return 0;
} }
/* Internal set flag */
#define NFT_SET_INACTIVE (1 << 15)
static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type, static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
struct nft_set *set) struct nft_set *set)
{ {
@ -304,7 +301,7 @@ static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
nft_trans_set_id(trans) = nft_trans_set_id(trans) =
ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
set->flags |= NFT_SET_INACTIVE; nft_activate_next(ctx->net, set);
} }
nft_trans_set(trans) = set; nft_trans_set(trans) = set;
list_add_tail(&trans->list, &ctx->net->nft.commit_list); list_add_tail(&trans->list, &ctx->net->nft.commit_list);
@ -320,7 +317,7 @@ static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
if (err < 0) if (err < 0)
return err; return err;
list_del_rcu(&set->list); nft_deactivate_next(ctx->net, set);
ctx->table->use--; ctx->table->use--;
return err; return err;
@ -741,6 +738,9 @@ static int nft_flush_table(struct nft_ctx *ctx)
} }
list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
if (!nft_is_active_next(ctx->net, set))
continue;
if (set->flags & NFT_SET_ANONYMOUS && if (set->flags & NFT_SET_ANONYMOUS &&
!list_empty(&set->bindings)) !list_empty(&set->bindings))
continue; continue;
@ -2367,7 +2367,7 @@ static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
} }
struct nft_set *nf_tables_set_lookup(const struct nft_table *table, struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
const struct nlattr *nla) const struct nlattr *nla, u8 genmask)
{ {
struct nft_set *set; struct nft_set *set;
@ -2375,22 +2375,27 @@ struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
list_for_each_entry(set, &table->sets, list) { list_for_each_entry(set, &table->sets, list) {
if (!nla_strcmp(nla, set->name)) if (!nla_strcmp(nla, set->name) &&
nft_active_genmask(set, genmask))
return set; return set;
} }
return ERR_PTR(-ENOENT); return ERR_PTR(-ENOENT);
} }
struct nft_set *nf_tables_set_lookup_byid(const struct net *net, struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
const struct nlattr *nla) const struct nlattr *nla,
u8 genmask)
{ {
struct nft_trans *trans; struct nft_trans *trans;
u32 id = ntohl(nla_get_be32(nla)); u32 id = ntohl(nla_get_be32(nla));
list_for_each_entry(trans, &net->nft.commit_list, list) { list_for_each_entry(trans, &net->nft.commit_list, list) {
struct nft_set *set = nft_trans_set(trans);
if (trans->msg_type == NFT_MSG_NEWSET && if (trans->msg_type == NFT_MSG_NEWSET &&
id == nft_trans_set_id(trans)) id == nft_trans_set_id(trans) &&
return nft_trans_set(trans); nft_active_genmask(set, genmask))
return set;
} }
return ERR_PTR(-ENOENT); return ERR_PTR(-ENOENT);
} }
@ -2415,6 +2420,8 @@ static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
list_for_each_entry(i, &ctx->table->sets, list) { list_for_each_entry(i, &ctx->table->sets, list) {
int tmp; int tmp;
if (!nft_is_active_next(ctx->net, set))
continue;
if (!sscanf(i->name, name, &tmp)) if (!sscanf(i->name, name, &tmp))
continue; continue;
if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
@ -2434,6 +2441,8 @@ static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
snprintf(set->name, sizeof(set->name), name, min + n); snprintf(set->name, sizeof(set->name), name, min + n);
list_for_each_entry(i, &ctx->table->sets, list) { list_for_each_entry(i, &ctx->table->sets, list) {
if (!nft_is_active_next(ctx->net, i))
continue;
if (!strcmp(set->name, i->name)) if (!strcmp(set->name, i->name))
return -ENFILE; return -ENFILE;
} }
@ -2582,6 +2591,8 @@ static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
list_for_each_entry_rcu(set, &table->sets, list) { list_for_each_entry_rcu(set, &table->sets, list) {
if (idx < s_idx) if (idx < s_idx)
goto cont; goto cont;
if (!nft_is_active(net, set))
goto cont;
ctx_set = *ctx; ctx_set = *ctx;
ctx_set.table = table; ctx_set.table = table;
@ -2651,11 +2662,9 @@ static int nf_tables_getset(struct net *net, struct sock *nlsk,
if (nfmsg->nfgen_family == NFPROTO_UNSPEC) if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
return -EAFNOSUPPORT; return -EAFNOSUPPORT;
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
if (IS_ERR(set)) if (IS_ERR(set))
return PTR_ERR(set); return PTR_ERR(set);
if (set->flags & NFT_SET_INACTIVE)
return -ENOENT;
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (skb2 == NULL) if (skb2 == NULL)
@ -2798,7 +2807,7 @@ static int nf_tables_newset(struct net *net, struct sock *nlsk,
nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla); nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]); set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
if (IS_ERR(set)) { if (IS_ERR(set)) {
if (PTR_ERR(set) != -ENOENT) if (PTR_ERR(set) != -ENOENT)
return PTR_ERR(set); return PTR_ERR(set);
@ -2911,7 +2920,7 @@ static int nf_tables_delset(struct net *net, struct sock *nlsk,
if (err < 0) if (err < 0)
return err; return err;
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
if (IS_ERR(set)) if (IS_ERR(set))
return PTR_ERR(set); return PTR_ERR(set);
if (!list_empty(&set->bindings)) if (!list_empty(&set->bindings))
@ -2980,7 +2989,7 @@ void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
list_del_rcu(&binding->list); list_del_rcu(&binding->list);
if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS && if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
!(set->flags & NFT_SET_INACTIVE)) nft_is_active(ctx->net, set))
nf_tables_set_destroy(ctx, set); nf_tables_set_destroy(ctx, set);
} }
@ -3166,11 +3175,10 @@ static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
if (err < 0) if (err < 0)
return err; return err;
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
genmask);
if (IS_ERR(set)) if (IS_ERR(set))
return PTR_ERR(set); return PTR_ERR(set);
if (set->flags & NFT_SET_INACTIVE)
return -ENOENT;
event = NFT_MSG_NEWSETELEM; event = NFT_MSG_NEWSETELEM;
event |= NFNL_SUBSYS_NFTABLES << 8; event |= NFNL_SUBSYS_NFTABLES << 8;
@ -3232,11 +3240,10 @@ static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
if (err < 0) if (err < 0)
return err; return err;
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
genmask);
if (IS_ERR(set)) if (IS_ERR(set))
return PTR_ERR(set); return PTR_ERR(set);
if (set->flags & NFT_SET_INACTIVE)
return -ENOENT;
if (nlh->nlmsg_flags & NLM_F_DUMP) { if (nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = { struct netlink_dump_control c = {
@ -3567,11 +3574,13 @@ static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
if (err < 0) if (err < 0)
return err; return err;
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
genmask);
if (IS_ERR(set)) { if (IS_ERR(set)) {
if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
set = nf_tables_set_lookup_byid(net, set = nf_tables_set_lookup_byid(net,
nla[NFTA_SET_ELEM_LIST_SET_ID]); nla[NFTA_SET_ELEM_LIST_SET_ID],
genmask);
} }
if (IS_ERR(set)) if (IS_ERR(set))
return PTR_ERR(set); return PTR_ERR(set);
@ -3690,7 +3699,8 @@ static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
if (err < 0) if (err < 0)
return err; return err;
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
genmask);
if (IS_ERR(set)) if (IS_ERR(set))
return PTR_ERR(set); return PTR_ERR(set);
if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
@ -4003,7 +4013,7 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
NFT_MSG_DELRULE); NFT_MSG_DELRULE);
break; break;
case NFT_MSG_NEWSET: case NFT_MSG_NEWSET:
nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE; nft_clear(net, nft_trans_set(trans));
/* This avoids hitting -EBUSY when deleting the table /* This avoids hitting -EBUSY when deleting the table
* from the transaction. * from the transaction.
*/ */
@ -4016,6 +4026,7 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
nft_trans_destroy(trans); nft_trans_destroy(trans);
break; break;
case NFT_MSG_DELSET: case NFT_MSG_DELSET:
list_del_rcu(&nft_trans_set(trans)->list);
nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
NFT_MSG_DELSET, GFP_KERNEL); NFT_MSG_DELSET, GFP_KERNEL);
break; break;
@ -4134,8 +4145,7 @@ static int nf_tables_abort(struct net *net, struct sk_buff *skb)
break; break;
case NFT_MSG_DELSET: case NFT_MSG_DELSET:
trans->ctx.table->use++; trans->ctx.table->use++;
list_add_tail_rcu(&nft_trans_set(trans)->list, nft_clear(trans->ctx.net, nft_trans_set(trans));
&trans->ctx.table->sets);
nft_trans_destroy(trans); nft_trans_destroy(trans);
break; break;
case NFT_MSG_NEWSETELEM: case NFT_MSG_NEWSETELEM:
@ -4282,6 +4292,8 @@ static int nf_tables_check_loops(const struct nft_ctx *ctx,
} }
list_for_each_entry(set, &ctx->table->sets, list) { list_for_each_entry(set, &ctx->table->sets, list) {
if (!nft_is_active_next(ctx->net, set))
continue;
if (!(set->flags & NFT_SET_MAP) || if (!(set->flags & NFT_SET_MAP) ||
set->dtype != NFT_DATA_VERDICT) set->dtype != NFT_DATA_VERDICT)
continue; continue;

7
net/netfilter/nft_dynset.c
View File

@ -103,6 +103,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
const struct nlattr * const tb[]) const struct nlattr * const tb[])
{ {
struct nft_dynset *priv = nft_expr_priv(expr); struct nft_dynset *priv = nft_expr_priv(expr);
u8 genmask = nft_genmask_next(ctx->net);
struct nft_set *set; struct nft_set *set;
u64 timeout; u64 timeout;
int err; int err;
@ -112,11 +113,13 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
tb[NFTA_DYNSET_SREG_KEY] == NULL) tb[NFTA_DYNSET_SREG_KEY] == NULL)
return -EINVAL; return -EINVAL;
set = nf_tables_set_lookup(ctx->table, tb[NFTA_DYNSET_SET_NAME]); set = nf_tables_set_lookup(ctx->table, tb[NFTA_DYNSET_SET_NAME],
genmask);
if (IS_ERR(set)) { if (IS_ERR(set)) {
if (tb[NFTA_DYNSET_SET_ID]) if (tb[NFTA_DYNSET_SET_ID])
set = nf_tables_set_lookup_byid(ctx->net, set = nf_tables_set_lookup_byid(ctx->net,
tb[NFTA_DYNSET_SET_ID]); tb[NFTA_DYNSET_SET_ID],
genmask);
if (IS_ERR(set)) if (IS_ERR(set))
return PTR_ERR(set); return PTR_ERR(set);
} }

6
net/netfilter/nft_lookup.c
View File

@ -54,6 +54,7 @@ static int nft_lookup_init(const struct nft_ctx *ctx,
const struct nlattr * const tb[]) const struct nlattr * const tb[])
{ {
struct nft_lookup *priv = nft_expr_priv(expr); struct nft_lookup *priv = nft_expr_priv(expr);
u8 genmask = nft_genmask_next(ctx->net);
struct nft_set *set; struct nft_set *set;
int err; int err;
@ -61,11 +62,12 @@ static int nft_lookup_init(const struct nft_ctx *ctx,
tb[NFTA_LOOKUP_SREG] == NULL) tb[NFTA_LOOKUP_SREG] == NULL)
return -EINVAL; return -EINVAL;
set = nf_tables_set_lookup(ctx->table, tb[NFTA_LOOKUP_SET]); set = nf_tables_set_lookup(ctx->table, tb[NFTA_LOOKUP_SET], genmask);
if (IS_ERR(set)) { if (IS_ERR(set)) {
if (tb[NFTA_LOOKUP_SET_ID]) { if (tb[NFTA_LOOKUP_SET_ID]) {
set = nf_tables_set_lookup_byid(ctx->net, set = nf_tables_set_lookup_byid(ctx->net,
tb[NFTA_LOOKUP_SET_ID]); tb[NFTA_LOOKUP_SET_ID],
genmask);
} }
if (IS_ERR(set)) if (IS_ERR(set))
return PTR_ERR(set); return PTR_ERR(set);