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bpf: Make bpf_skb_change_proto helper metadata-safe

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bpf_skb_change_proto reuses the same headroom operations as
bpf_skb_adjust_room, already updated to handle metadata safely.

The remaining step is to ensure that there is sufficient headroom to
accommodate metadata on skb_push().

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-v4-8-5ceb08a9b37b@cloudflare.com
This commit is contained in:
Jakub Sitnicki
2025-11-05 21:19:45 +01:00
committed by Martin KaFai Lau
parent be83105d38
commit 8cfc172ce2
1 changed files with 2 additions and 1 deletions
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3
net/core/filter.c
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@@ -3326,10 +3326,11 @@ static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len)
static int bpf_skb_proto_4_to_6(struct sk_buff *skb)
{
const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
const u8 meta_len = skb_metadata_len(skb);
u32 off = skb_mac_header_len(skb);
int ret;
ret = skb_cow(skb, len_diff);
ret = skb_cow(skb, meta_len + len_diff);
if (unlikely(ret < 0))
return ret;