Commit abf981bb authored by Oliver Hartkopp's avatar Oliver Hartkopp Committed by Jakub Kicinski
Browse files

net: skb: allow up to 8 skb extension ids 

The skb extension ids range from 0 .. 7 to fit their bits as flags into
a single byte. The ids are automatically enumnerated in enum skb_ext_id
in skbuff.h, where SKB_EXT_NUM is defined as the last value.

When having 8 skb extension ids (0 .. 7), SKB_EXT_NUM becomes 8 which is
a valid value for SKB_EXT_NUM.

Fixes: 96ea3a1e ("can: add CAN skb extension infrastructure")
Link: https://lore.kernel.org/netdev/aXoMqaA7b2CqJZNA@strlen.de/


Reviewed-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarOliver Hartkopp <socketcan@hartkopp.net>
Link: https://patch.msgid.link/20260205-skb_ext-v1-1-9ba992ccee8b@hartkopp.net


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent dddb0198

net/core/skbuff.c

+1 −1
Original line number Diff line number Diff line
@@ -5158,7 +5158,7 @@ static __always_inline unsigned int skb_ext_total_length(void) 


static void skb_extensions_init(void)

{

	BUILD_BUG_ON(SKB_EXT_NUM >= 8);

	BUILD_BUG_ON(SKB_EXT_NUM > 8);

#if !IS_ENABLED(CONFIG_KCOV_INSTRUMENT_ALL)

	BUILD_BUG_ON(skb_ext_total_length() > 255);

#endif