Merge tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Martin KaFai Lau says:

====================
pull-request: bpf-next 2025-11-10

We've added 19 non-merge commits during the last 3 day(s) which contain
a total of 22 files changed, 1345 insertions(+), 197 deletions(-).

The main changes are:

1) Preserve skb metadata after a TC BPF program has changed the skb,
   from Jakub Sitnicki.
   This allows a TC program at the end of a TC filter chain to still see
   the skb metadata, even if another TC program at the front of the chain
   has changed the skb using BPF helpers.

2) Initial af_smc bpf_struct_ops support to control the smc specific
   syn/synack options, from D. Wythe.

* tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next:
  bpf/selftests: Add selftest for bpf_smc_hs_ctrl
  net/smc: bpf: Introduce generic hook for handshake flow
  bpf: Export necessary symbols for modules with struct_ops
  selftests/bpf: Cover skb metadata access after bpf_skb_change_proto
  selftests/bpf: Cover skb metadata access after change_head/tail helper
  selftests/bpf: Cover skb metadata access after bpf_skb_adjust_room
  selftests/bpf: Cover skb metadata access after vlan push/pop helper
  selftests/bpf: Expect unclone to preserve skb metadata
  selftests/bpf: Dump skb metadata on verification failure
  selftests/bpf: Verify skb metadata in BPF instead of userspace
  bpf: Make bpf_skb_change_head helper metadata-safe
  bpf: Make bpf_skb_change_proto helper metadata-safe
  bpf: Make bpf_skb_adjust_room metadata-safe
  bpf: Make bpf_skb_vlan_push helper metadata-safe
  bpf: Make bpf_skb_vlan_pop helper metadata-safe
  vlan: Make vlan_remove_tag return nothing
  bpf: Unclone skb head on bpf_dynptr_write to skb metadata
  net: Preserve metadata on pskb_expand_head
  net: Helper to move packet data and metadata after skb_push/pull
====================

Link: https://patch.msgid.link/20251110232427.3929291-1-martin.lau@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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);