netdev - [PATCH iproute2-next v2 1/4] libnetlink: Add rta_getattr

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Message-ID: <e48770c7fbf45e14b2bac182d4083f56e02b7805.1710427655.git.petrm@nvidia.com>
Date: Thu, 14 Mar 2024 15:52:12 +0100
From: Petr Machata <petrm@...dia.com>
To: David Ahern <dsahern@...nel.org>, Stephen Hemminger
	<stephen@...workplumber.org>, <netdev@...r.kernel.org>
CC: Ido Schimmel <idosch@...dia.com>, Petr Machata <petrm@...dia.com>, "Jakub
 Kicinski" <kuba@...nel.org>, <mlxsw@...dia.com>
Subject: [PATCH iproute2-next v2 1/4] libnetlink: Add rta_getattr_uint()

NLA_UINT attributes have a 4-byte payload if possible, and an 8-byte one if
necessary. Add a function to extract these. Since we need to dispatch on
length anyway, make the getter truly universal by supporting also u8 and
u16.

Signed-off-by: Petr Machata <petrm@...dia.com>
---

Notes:
    v2:
    - have rta_getattr_uint() support 8- and 16-bit quantities as well

 include/libnetlink.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/libnetlink.h b/include/libnetlink.h
index ad7e7127..35a9bb57 100644
--- a/include/libnetlink.h
+++ b/include/libnetlink.h
@@ -260,6 +260,20 @@ static inline __u64 rta_getattr_u64(const struct rtattr *rta)
 	memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
 	return tmp;
 }
+static inline __u64 rta_getattr_uint(const struct rtattr *rta)
+{
+	switch (RTA_PAYLOAD(rta)) {
+	case sizeof(__u8):
+		return rta_getattr_u8(rta);
+	case sizeof(__u16):
+		return rta_getattr_u16(rta);
+	case sizeof(__u32):
+		return rta_getattr_u32(rta);
+	case sizeof(__u64):
+		return rta_getattr_u64(rta);
+	}
+	return -1ULL;
+}
 static inline __s32 rta_getattr_s32(const struct rtattr *rta)
 {
 	return *(__s32 *)RTA_DATA(rta);
-- 
2.43.0