diff mbox series

[RFC,bpf-next,17/20] trait: Allow socket filters to access traits

Message ID 20250305-afabre-traits-010-rfc2-v1-17-d0ecfb869797@cloudflare.com (mailing list archive)
State RFC
Delegated to: BPF
Headers show
Series traits: Per packet metadata KV store | expand

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netdev/series_format fail Series longer than 15 patches
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit fail Errors and warnings before: 125 this patch: 146
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers warning 16 maintainers not CCed: jolsa@kernel.org sdf@fomichev.me horms@kernel.org haoluo@google.com martin.lau@linux.dev kuba@kernel.org yonghong.song@linux.dev daniel@iogearbox.net kpsingh@kernel.org andrii@kernel.org pabeni@redhat.com ast@kernel.org john.fastabend@gmail.com edumazet@google.com eddyz87@gmail.com song@kernel.org
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netdev/verify_fixes success No Fixes tag
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netdev/kdoc success Errors and warnings before: 6 this patch: 6
netdev/source_inline success Was 0 now: 0

Commit Message

Arthur Fabre March 5, 2025, 2:32 p.m. UTC 
From: Arthur Fabre <afabre@cloudflare.com>

Add kfuncs to allow socket filter programs access to traits in an skb.

Signed-off-by: Arthur Fabre <afabre@cloudflare.com>
---
 net/core/filter.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
diff mbox series

Patch

diff --git a/net/core/filter.c b/net/core/filter.c
index 79b78e7cd57fd78c6cc8443da54ae96408c496b0..47f18fb0e23c2c19d26f9b408653c6756a5110c7 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -12063,6 +12063,39 @@  __bpf_kfunc int bpf_sk_assign_tcp_reqsk(struct __sk_buff *s, struct sock *sk,
 #endif
 }
 
+__bpf_kfunc int bpf_skb_trait_set(const struct sk_buff *skb, u64 key,
+				  const void *val, u64 val__sz, u64 flags)
+{
+	void *traits = skb_traits(skb);
+
+	if (!traits)
+		return -EOPNOTSUPP;
+
+	return trait_set(traits, skb_metadata_end(skb) - skb_metadata_len(skb),
+			 key, val, val__sz, flags);
+}
+
+__bpf_kfunc int bpf_skb_trait_get(const struct sk_buff *skb, u64 key,
+				  void *val, u64 val__sz)
+{
+	void *traits = skb_traits(skb);
+
+	if (!traits)
+		return -EOPNOTSUPP;
+
+	return trait_get(traits, key, val, val__sz);
+}
+
+__bpf_kfunc int bpf_skb_trait_del(const struct sk_buff *skb, u64 key)
+{
+	void *traits = skb_traits(skb);
+
+	if (!traits)
+		return -EOPNOTSUPP;
+
+	return trait_del(traits, key);
+}
+
 __bpf_kfunc_end_defs();
 
 int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
@@ -12082,6 +12115,9 @@  int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
 
 BTF_KFUNCS_START(bpf_kfunc_check_set_skb)
 BTF_ID_FLAGS(func, bpf_dynptr_from_skb, KF_TRUSTED_ARGS)
+BTF_ID_FLAGS(func, bpf_skb_trait_set)
+BTF_ID_FLAGS(func, bpf_skb_trait_get)
+BTF_ID_FLAGS(func, bpf_skb_trait_del)
 BTF_KFUNCS_END(bpf_kfunc_check_set_skb)
 
 BTF_KFUNCS_START(bpf_kfunc_check_set_xdp)