diff options
| author | Jakub Sitnicki <jakub@cloudflare.com> | 2025-11-05 21:19:40 +0100 |
|---|---|---|
| committer | Martin KaFai Lau <martin.lau@kernel.org> | 2025-11-10 10:52:31 -0800 |
| commit | f38499ff45f567c932d0911e6a30b8ca022b9b52 (patch) | |
| tree | 54832a54e7699c664e5163dacb10e7b829a7d133 /include | |
| parent | 290fc0be09e2f6e08754782616bb7e67f8191fa1 (diff) | |
bpf: Unclone skb head on bpf_dynptr_write to skb metadata
Currently bpf_dynptr_from_skb_meta() marks the dynptr as read-only when
the skb is cloned, preventing writes to metadata.
Remove this restriction and unclone the skb head on bpf_dynptr_write() to
metadata, now that the metadata is preserved during uncloning. This makes
metadata dynptr consistent with skb dynptr, allowing writes regardless of
whether the skb is cloned.
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20251105-skb-meta-rx-path-v4-3-5ceb08a9b37b@cloudflare.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/filter.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h index e116de7edc58..a104b3994230 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -1781,6 +1781,8 @@ int __bpf_xdp_store_bytes(struct xdp_buff *xdp, u32 offset, void *buf, u32 len); void *bpf_xdp_pointer(struct xdp_buff *xdp, u32 offset, u32 len); void bpf_xdp_copy_buf(struct xdp_buff *xdp, unsigned long off, void *buf, unsigned long len, bool flush); +int __bpf_skb_meta_store_bytes(struct sk_buff *skb, u32 offset, + const void *from, u32 len, u64 flags); void *bpf_skb_meta_pointer(struct sk_buff *skb, u32 offset); #else /* CONFIG_NET */ static inline int __bpf_skb_load_bytes(const struct sk_buff *skb, u32 offset, @@ -1817,6 +1819,13 @@ static inline void bpf_xdp_copy_buf(struct xdp_buff *xdp, unsigned long off, voi { } +static inline int __bpf_skb_meta_store_bytes(struct sk_buff *skb, u32 offset, + const void *from, u32 len, + u64 flags) +{ + return -EOPNOTSUPP; +} + static inline void *bpf_skb_meta_pointer(struct sk_buff *skb, u32 offset) { return ERR_PTR(-EOPNOTSUPP); |