netdev - [PATCH net-next v4 11/13] gtp: Move gtp_parse

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Message-Id: <20240823201557.1794985-12-tom@herbertland.com>
Date: Fri, 23 Aug 2024 13:15:55 -0700
From: Tom Herbert <tom@...bertland.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	edumazet@...gle.com,
	netdev@...r.kernel.org,
	felipe@...anda.io,
	willemdebruijn.kernel@...il.com,
	pablo@...filter.org,
	laforge@...monks.org,
	xeb@...l.ru
Cc: Tom Herbert <tom@...bertland.com>
Subject: [PATCH net-next v4 11/13] gtp: Move gtp_parse_exthdrs into net/gtp.h

gtp_parse_exthdrs is a generic function, move into a header file
so we can call it outside of the GTP driver (specifically, we can
call it from flow dissector)

Signed-off-by: Tom Herbert <tom@...bertland.com>
---
 drivers/net/gtp.c | 37 -------------------------------------
 include/net/gtp.h | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 37 deletions(-)

diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index 0696faf60013..259c7043d20c 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -742,43 +742,6 @@ static int gtp1u_handle_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb)
 				       msg, 0, GTP_GENL_MCGRP, GFP_ATOMIC);
 }
 
-static int gtp_parse_exthdrs(struct sk_buff *skb, unsigned int *hdrlen)
-{
-	struct gtp_ext_hdr *gtp_exthdr, _gtp_exthdr;
-	unsigned int offset = *hdrlen;
-	__u8 *next_type, _next_type;
-
-	/* From 29.060: "The Extension Header Length field specifies the length
-	 * of the particular Extension header in 4 octets units."
-	 *
-	 * This length field includes length field size itself (1 byte),
-	 * payload (variable length) and next type (1 byte). The extension
-	 * header is aligned to to 4 bytes.
-	 */
-
-	do {
-		gtp_exthdr = skb_header_pointer(skb, offset, sizeof(*gtp_exthdr),
-						&_gtp_exthdr);
-		if (!gtp_exthdr || !gtp_exthdr->len)
-			return -1;
-
-		offset += gtp_exthdr->len * 4;
-
-		/* From 29.060: "If no such Header follows, then the value of
-		 * the Next Extension Header Type shall be 0."
-		 */
-		next_type = skb_header_pointer(skb, offset - 1,
-					       sizeof(_next_type), &_next_type);
-		if (!next_type)
-			return -1;
-
-	} while (*next_type != 0);
-
-	*hdrlen = offset;
-
-	return 0;
-}
-
 static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
 {
 	unsigned int hdrlen = sizeof(struct udphdr) +
diff --git a/include/net/gtp.h b/include/net/gtp.h
index c0253c8702d0..a513aa1c7394 100644
--- a/include/net/gtp.h
+++ b/include/net/gtp.h
@@ -83,4 +83,42 @@ struct gtp_ext_hdr {
 	__u8	data[];
 };
 
+static inline int gtp_parse_exthdrs(const struct sk_buff *skb,
+				    unsigned int *hdrlen)
+{
+	struct gtp_ext_hdr *gtp_exthdr, _gtp_exthdr;
+	unsigned int offset = *hdrlen;
+	__u8 *next_type, _next_type;
+
+	/* From 29.060: "The Extension Header Length field specifies the length
+	 * of the particular Extension header in 4 octets units."
+	 *
+	 * This length field includes length field size itself (1 byte),
+	 * payload (variable length) and next type (1 byte). The extension
+	 * header is aligned to 4 bytes.
+	 */
+
+	do {
+		gtp_exthdr = skb_header_pointer(skb, offset, sizeof(*gtp_exthdr),
+						&_gtp_exthdr);
+		if (!gtp_exthdr || !gtp_exthdr->len)
+			return -1;
+
+		offset += gtp_exthdr->len * 4;
+
+		/* From 29.060: "If no such Header follows, then the value of
+		 * the Next Extension Header Type shall be 0."
+		 */
+		next_type = skb_header_pointer(skb, offset - 1,
+					       sizeof(_next_type), &_next_type);
+		if (!next_type)
+			return -1;
+
+	} while (*next_type != 0);
+
+	*hdrlen = offset;
+
+	return 0;
+}
+
 #endif
-- 
2.34.1