netdev - [net-next] ipv6: sr: export some functions of seg6local

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Date:   Fri, 29 Dec 2017 22:09:44 +0100
From:   Ahmed Abdelsalam <amsalam20@...il.com>
To:     davem@...emloft.net, kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org
Cc:     david.lebrun@...ouvain.be, netdev@...r.kernel.org,
        amsalam20@...il.com
Subject: [net-next] ipv6: sr: export some functions of seg6local

Some functions of seg6local are very useful to process SRv6
encapsulated packets.

This patch exports some functions of seg6local that are useful and
can be re-used at different parts of the kernel.

The set of exported functions are:
(1) get_srh()
(2) advance_nextseg()
(3) lookup_nexthop

Signed-off-by: Ahmed Abdelsalam <amsalam20@...il.com>
---
I'm writing some extensions to netfilter framework to support
Segment Routing. These function are useful to process
SR-encapsulated packets

 include/net/seg6.h    |  4 ++++
 net/ipv6/seg6_local.c | 11 +++++++----
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/include/net/seg6.h b/include/net/seg6.h
index 099bad5..4058f23 100644
--- a/include/net/seg6.h
+++ b/include/net/seg6.h
@@ -60,6 +60,10 @@ extern int seg6_local_init(void);
 extern void seg6_local_exit(void);
 
 extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len);
+extern struct ipv6_sr_hdr *get_srh(struct sk_buff *skb);
+extern void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr);
+extern void lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
+			u32 tbl_id);
 extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
 			     int proto);
 extern int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh);
diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c
index 825b8e0..5661d6c 100644
--- a/net/ipv6/seg6_local.c
+++ b/net/ipv6/seg6_local.c
@@ -59,7 +59,7 @@ static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt)
 	return (struct seg6_local_lwt *)lwt->data;
 }
 
-static struct ipv6_sr_hdr *get_srh(struct sk_buff *skb)
+struct ipv6_sr_hdr *get_srh(struct sk_buff *skb)
 {
 	struct ipv6_sr_hdr *srh;
 	int len, srhoff = 0;
@@ -82,6 +82,7 @@ static struct ipv6_sr_hdr *get_srh(struct sk_buff *skb)
 
 	return srh;
 }
+EXPORT_SYMBOL_GPL(get_srh);
 
 static struct ipv6_sr_hdr *get_and_validate_srh(struct sk_buff *skb)
 {
@@ -131,7 +132,7 @@ static bool decap_and_validate(struct sk_buff *skb, int proto)
 	return true;
 }
 
-static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr)
+void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr)
 {
 	struct in6_addr *addr;
 
@@ -139,9 +140,10 @@ static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr)
 	addr = srh->segments + srh->segments_left;
 	*daddr = *addr;
 }
+EXPORT_SYMBOL_GPL(advance_nextseg);
 
-static void lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
-			   u32 tbl_id)
+void lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
+		    u32 tbl_id)
 {
 	struct net *net = dev_net(skb->dev);
 	struct ipv6hdr *hdr = ipv6_hdr(skb);
@@ -188,6 +190,7 @@ static void lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
 	skb_dst_drop(skb);
 	skb_dst_set(skb, dst);
 }
+EXPORT_SYMBOL_GPL(lookup_nexthop);
 
 /* regular endpoint function */
 static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt)
-- 
2.1.4