diff options
| author | Jakub Sitnicki <jakub@cloudflare.com> | 2025-08-14 11:59:28 +0200 |
|---|---|---|
| committer | Martin KaFai Lau <martin.lau@kernel.org> | 2025-08-18 10:29:42 -0700 |
| commit | 6877cd392baecf816c2ba896a9d42874628004a5 (patch) | |
| tree | 13fa85d0eca4b82cf9cef66df15c1da5c5f28776 /include/linux | |
| parent | 89d912e494f786e79f69ed9d567a8842c71dbb03 (diff) | |
bpf: Enable read/write access to skb metadata through a dynptr
Now that we can create a dynptr to skb metadata, make reads to the metadata
area possible with bpf_dynptr_read() or through a bpf_dynptr_slice(), and
make writes to the metadata area possible with bpf_dynptr_write() or
through a bpf_dynptr_slice_rdwr().
Note that for cloned skbs which share data with the original, we limit the
skb metadata dynptr to be read-only since we don't unclone on a
bpf_dynptr_write to metadata.
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20250814-skb-metadata-thru-dynptr-v7-2-8a39e636e0fb@cloudflare.com
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/filter.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h index 1e7fd3ee759e..9ed21b65e2e9 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -1784,6 +1784,7 @@ 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); +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, void *to, u32 len) @@ -1818,6 +1819,11 @@ static inline void bpf_xdp_copy_buf(struct xdp_buff *xdp, unsigned long off, voi unsigned long len, bool flush) { } + +static inline void *bpf_skb_meta_pointer(struct sk_buff *skb, u32 offset) +{ + return NULL; +} #endif /* CONFIG_NET */ #endif /* __LINUX_FILTER_H__ */ |