netdev - [PATCH net-next 1/2] net: add skb_get

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Message-Id: <20211014175918.60188-2-eric.dumazet@gmail.com>
Date:   Thu, 14 Oct 2021 10:59:17 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Neal Cardwell <ncardwell@...gle.com>,
        Ingemar Johansson S <ingemar.s.johansson@...csson.com>,
        Tom Henderson <tomh@...h.org>
Subject: [PATCH net-next 1/2] net: add skb_get_dsfield() helper

From: Eric Dumazet <edumazet@...gle.com>

skb_get_dsfield(skb) gets dsfield from skb, or -1
if an error was found.

This is basically a wrapper around ipv4_get_dsfield()
and ipv6_get_dsfield().

Used by following patch for fq_codel.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Neal Cardwell <ncardwell@...gle.com>
Cc: Ingemar Johansson S <ingemar.s.johansson@...csson.com>
Cc: Tom Henderson <tomh@...h.org>
---
 include/net/inet_ecn.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/net/inet_ecn.h b/include/net/inet_ecn.h
index ba77f47ef61ed3dbb38504ece304c00825f461fd..ea32393464a291aad77400b34fcdcb5031f01676 100644
--- a/include/net/inet_ecn.h
+++ b/include/net/inet_ecn.h
@@ -188,6 +188,23 @@ static inline int INET_ECN_set_ce(struct sk_buff *skb)
 	return 0;
 }
 
+static inline int skb_get_dsfield(struct sk_buff *skb)
+{
+	switch (skb_protocol(skb, true)) {
+	case cpu_to_be16(ETH_P_IP):
+		if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
+			break;
+		return ipv4_get_dsfield(ip_hdr(skb));
+
+	case cpu_to_be16(ETH_P_IPV6):
+		if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
+			break;
+		return ipv6_get_dsfield(ipv6_hdr(skb));
+	}
+
+	return -1;
+}
+
 static inline int INET_ECN_set_ect1(struct sk_buff *skb)
 {
 	switch (skb_protocol(skb, true)) {
-- 
2.33.0.1079.g6e70778dc9-goog