mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

netfilter: nft_set_pipapo: walk over current view on netlink dump 

The generation mask can be updated while netlink dump is in progress.
The pipapo set backend walk iterator cannot rely on it to infer what
view of the datastructure is to be used. Add notation to specify if user
wants to read/update the set.

Based on patch from Florian Westphal.

Fixes: 2b84e215f8 ("netfilter: nft_set_pipapo: .walk does not deal with generations")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2024-04-10 18:50:45 +02:00
parent 751de2012e
commit 29b359cf6d
3 changed files with 23 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
include/net/netfilter/nf_tables.h
View File

@ -307,9 +307,23 @@ static inline void *nft_elem_priv_cast(const struct nft_elem_priv *priv)
return (void *)priv;
}
/**
* enum nft_iter_type - nftables set iterator type
*
* @NFT_ITER_READ: read-only iteration over set elements
* @NFT_ITER_UPDATE: iteration under mutex to update set element state
*/
enum nft_iter_type {
NFT_ITER_UNSPEC,
NFT_ITER_READ,
NFT_ITER_UPDATE,
};
struct nft_set;
struct nft_set_iter {
u8 genmask;
enum nft_iter_type type:8;
unsigned int count;
unsigned int skip;
int err;

6
net/netfilter/nf_tables_api.c
View File

@ -626,6 +626,7 @@ static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
{
struct nft_set_iter iter = {
.genmask = nft_genmask_next(ctx->net),
.type = NFT_ITER_UPDATE,
.fn = nft_mapelem_deactivate,
};
@ -5445,6 +5446,7 @@ int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
}
iter.genmask = nft_genmask_next(ctx->net);
iter.type = NFT_ITER_UPDATE;
iter.skip = 0;
iter.count = 0;
iter.err = 0;
@ -5518,6 +5520,7 @@ static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
{
struct nft_set_iter iter = {
.genmask = nft_genmask_next(ctx->net),
.type = NFT_ITER_UPDATE,
.fn = nft_mapelem_activate,
};
@ -5892,6 +5895,7 @@ static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
args.skb = skb;
args.reset = dump_ctx->reset;
args.iter.genmask = nft_genmask_cur(net);
args.iter.type = NFT_ITER_READ;
args.iter.skip = cb->args[0];
args.iter.count = 0;
args.iter.err = 0;
@ -7376,6 +7380,7 @@ static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
{
struct nft_set_iter iter = {
.genmask = genmask,
.type = NFT_ITER_UPDATE,
.fn = nft_setelem_flush,
};
@ -10879,6 +10884,7 @@ static int nf_tables_check_loops(const struct nft_ctx *ctx,
continue;
iter.genmask = nft_genmask_next(ctx->net);
iter.type = NFT_ITER_UPDATE;
iter.skip = 0;
iter.count = 0;
iter.err = 0;

5
net/netfilter/nft_set_pipapo.c
View File

@ -2115,13 +2115,14 @@ static void nft_pipapo_walk(const struct nft_ctx *ctx, struct nft_set *set,
struct nft_set_iter *iter)
{
struct nft_pipapo *priv = nft_set_priv(set);
struct net *net = read_pnet(&set->net);
const struct nft_pipapo_match *m;
const struct nft_pipapo_field *f;
unsigned int i, r;
WARN_ON_ONCE(iter->type == NFT_ITER_UNSPEC);
rcu_read_lock();
if (iter->genmask == nft_genmask_cur(net))
if (iter->type == NFT_ITER_READ)
m = rcu_dereference(priv->match);
else
m = priv->clone;