[PATCH net-next 1/2] net: add skb_get_dsfield() helper
From: Eric Dumazet <hidden>
Date: 2021-10-14 17:59:25
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Eric Dumazet <edumazet@google.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@google.com> Cc: Neal Cardwell <ncardwell@google.com> Cc: Ingemar Johansson S <redacted> Cc: Tom Henderson <redacted> --- 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)) {
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2.33.0.1079.g6e70778dc9-goog