[PATCH nft] src: avoid IPPROTO_MAX for array definitions

[Florian Westphal <fw@strlen.de>]

ip header can only accomodate 8but value, but IPPROTO_MAX has been bumped
due to uapi reasons to support MPTCP (262, which is used to toggle on
multipath support in tcp).

This results in:
exthdr.c:349:11: warning: result of comparison of constant 263 with expression of type 'uint8_t' (aka 'unsigned char') is always true [-Wtautological-constant-out-of-range-compare]
if (type < array_size(exthdr_protocols))
            ~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~

redude array sizes back to what can be used on-wire.

Signed-off-by: Florian Westphal <fw@strlen.de>
---
 include/rule.h | 2 +-
 src/exthdr.c   | 5 ++---
 src/rule.c     | 2 +-
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/include/rule.h b/include/rule.h
index b360e2614c78..5cb549c2e14e 100644
--- a/include/rule.h
+++ b/include/rule.h
@@ -786,7 +786,7 @@ struct timeout_protocol {
 	uint32_t *dflt_timeout;
 };
 
-extern struct timeout_protocol timeout_protocol[IPPROTO_MAX];
+extern struct timeout_protocol timeout_protocol[UINT8_MAX + 1];
 extern int timeout_str2num(uint16_t l4proto, struct timeout_state *ts);
 
 #endif /* NFTABLES_RULE_H */
diff --git a/src/exthdr.c b/src/exthdr.c
index d0274bea6ca0..f5527ddb4a3f 100644
--- a/src/exthdr.c
+++ b/src/exthdr.c
@@ -289,7 +289,7 @@ struct stmt *exthdr_stmt_alloc(const struct location *loc,
 	return stmt;
 }
 
-static const struct exthdr_desc *exthdr_protocols[IPPROTO_MAX] = {
+static const struct exthdr_desc *exthdr_protocols[UINT8_MAX + 1] = {
 	[IPPROTO_HOPOPTS]	= &exthdr_hbh,
 	[IPPROTO_ROUTING]	= &exthdr_rt,
 	[IPPROTO_FRAGMENT]	= &exthdr_frag,
@@ -346,8 +346,7 @@ void exthdr_init_raw(struct expr *expr, uint8_t type,
 	expr->exthdr.offset = offset;
 	expr->exthdr.desc = NULL;
 
-	if (type < array_size(exthdr_protocols))
-		expr->exthdr.desc = exthdr_protocols[type];
+	expr->exthdr.desc = exthdr_protocols[type];
 
 	if (expr->exthdr.desc == NULL)
 		goto out;
diff --git a/src/rule.c b/src/rule.c
index 3704600a87be..19d681bb74b3 100644
--- a/src/rule.c
+++ b/src/rule.c
@@ -76,7 +76,7 @@ static uint32_t udp_dflt_timeout[] = {
 	[NFTNL_CTTIMEOUT_UDP_REPLIED]		= 120,
 };
 
-struct timeout_protocol timeout_protocol[IPPROTO_MAX] = {
+struct timeout_protocol timeout_protocol[UINT8_MAX + 1] = {
 	[IPPROTO_TCP]	= {
 		.array_size	= NFTNL_CTTIMEOUT_TCP_MAX,
 		.state_to_name	= tcp_state_to_name,
-- 
2.39.3