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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2024-08-12 13:27:41 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-08-19 06:41:22 +0300 |
| commit | d5f87c11114b5a6293cd44d94132bb8784c124b6 (patch) | |
| tree | 52d546be7262b4423f385cb8e534984c0e9da98d /include/net | |
| parent | 7b17de2a71e56c10335b565cc7ad238e6d984379 (diff) | |
| download | linux-d5f87c11114b5a6293cd44d94132bb8784c124b6.tar.xz | |
netfilter: nf_tables: allow clone callbacks to sleep
commit fa23e0d4b756d25829e124d6b670a4c6bbd4bf7e upstream.
Sven Auhagen reports transaction failures with following error:
./main.nft:13:1-26: Error: Could not process rule: Cannot allocate memory
percpu: allocation failed, size=16 align=8 atomic=1, atomic alloc failed, no space left
This points to failing pcpu allocation with GFP_ATOMIC flag.
However, transactions happen from user context and are allowed to sleep.
One case where we can call into percpu allocator with GFP_ATOMIC is
nft_counter expression.
Normally this happens from control plane, so this could use GFP_KERNEL
instead. But one use case, element insertion from packet path,
needs to use GFP_ATOMIC allocations (nft_dynset expression).
At this time, .clone callbacks always use GFP_ATOMIC for this reason.
Add gfp_t argument to the .clone function and pass GFP_KERNEL or
GFP_ATOMIC flag depending on context, this allows all clone memory
allocations to sleep for the normal (transaction) case.
Cc: Sven Auhagen <sven.auhagen@voleatech.de>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/netfilter/nf_tables.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h index dd7c310e7216..3cc25a5faa23 100644 --- a/include/net/netfilter/nf_tables.h +++ b/include/net/netfilter/nf_tables.h @@ -786,7 +786,7 @@ struct nft_expr_ops { struct nft_regs *regs, const struct nft_pktinfo *pkt); int (*clone)(struct nft_expr *dst, - const struct nft_expr *src); + const struct nft_expr *src, gfp_t gfp); unsigned int size; int (*init)(const struct nft_ctx *ctx, @@ -837,7 +837,7 @@ static inline void *nft_expr_priv(const struct nft_expr *expr) return (void *)expr->data; } -int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src); +int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src, gfp_t gfp); void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr); int nft_expr_dump(struct sk_buff *skb, unsigned int attr, const struct nft_expr *expr); |