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From: Justin Iurman <justin.iurman@uliege.be>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, kuba@kernel.org, yoshfuji@linux-ipv6.org,
	dsahern@kernel.org, justin.iurman@uliege.be
Subject: [PATCH net-next v2 1/4] ipv6: ioam: Distinguish input and output for hop-limit
Date: Sun,  3 Oct 2021 20:45:36 +0200	[thread overview]
Message-ID: <20211003184539.23629-2-justin.iurman@uliege.be> (raw)
In-Reply-To: <20211003184539.23629-1-justin.iurman@uliege.be>

This patch anticipates the support for the IOAM insertion inside in-transit
packets, by making a difference between input and output in order to determine
the right value for its hop-limit (inherited from the IPv6 hop-limit).

Input case: happens before ip6_forward, the IPv6 hop-limit is not decremented
yet -> decrement the IOAM hop-limit to reflect the new hop inside the trace.

Output case: happens after ip6_forward, the IPv6 hop-limit has already been
decremented -> keep the same value for the IOAM hop-limit.

Signed-off-by: Justin Iurman <justin.iurman@uliege.be>
---
 include/net/ioam6.h |  3 ++-
 net/ipv6/exthdrs.c  |  2 +-
 net/ipv6/ioam6.c    | 11 ++++++-----
 3 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/include/net/ioam6.h b/include/net/ioam6.h
index 3c2993bc48c8..3f45ba37a2c6 100644
--- a/include/net/ioam6.h
+++ b/include/net/ioam6.h
@@ -56,7 +56,8 @@ static inline struct ioam6_pernet_data *ioam6_pernet(struct net *net)
 struct ioam6_namespace *ioam6_namespace(struct net *net, __be16 id);
 void ioam6_fill_trace_data(struct sk_buff *skb,
 			   struct ioam6_namespace *ns,
-			   struct ioam6_trace_hdr *trace);
+			   struct ioam6_trace_hdr *trace,
+			   bool is_input);
 
 int ioam6_init(void);
 void ioam6_exit(void);
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index 3a871a09f962..38ece3b7b839 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -979,7 +979,7 @@ static bool ipv6_hop_ioam(struct sk_buff *skb, int optoff)
 		if (!skb_valid_dst(skb))
 			ip6_route_input(skb);
 
-		ioam6_fill_trace_data(skb, ns, trace);
+		ioam6_fill_trace_data(skb, ns, trace, true);
 		break;
 	default:
 		break;
diff --git a/net/ipv6/ioam6.c b/net/ipv6/ioam6.c
index 5e8961004832..4e5583dbadac 100644
--- a/net/ipv6/ioam6.c
+++ b/net/ipv6/ioam6.c
@@ -631,7 +631,7 @@ static void __ioam6_fill_trace_data(struct sk_buff *skb,
 				    struct ioam6_namespace *ns,
 				    struct ioam6_trace_hdr *trace,
 				    struct ioam6_schema *sc,
-				    u8 sclen)
+				    u8 sclen, bool is_input)
 {
 	struct __kernel_sock_timeval ts;
 	u64 raw64;
@@ -645,7 +645,7 @@ static void __ioam6_fill_trace_data(struct sk_buff *skb,
 	/* hop_lim and node_id */
 	if (trace->type.bit0) {
 		byte = ipv6_hdr(skb)->hop_limit;
-		if (skb->dev)
+		if (is_input)
 			byte--;
 
 		raw32 = dev_net(skb_dst(skb)->dev)->ipv6.sysctl.ioam6_id;
@@ -730,7 +730,7 @@ static void __ioam6_fill_trace_data(struct sk_buff *skb,
 	/* hop_lim and node_id (wide) */
 	if (trace->type.bit8) {
 		byte = ipv6_hdr(skb)->hop_limit;
-		if (skb->dev)
+		if (is_input)
 			byte--;
 
 		raw64 = dev_net(skb_dst(skb)->dev)->ipv6.sysctl.ioam6_id_wide;
@@ -786,7 +786,8 @@ static void __ioam6_fill_trace_data(struct sk_buff *skb,
 /* called with rcu_read_lock() */
 void ioam6_fill_trace_data(struct sk_buff *skb,
 			   struct ioam6_namespace *ns,
-			   struct ioam6_trace_hdr *trace)
+			   struct ioam6_trace_hdr *trace,
+			   bool is_input)
 {
 	struct ioam6_schema *sc;
 	u8 sclen = 0;
@@ -822,7 +823,7 @@ void ioam6_fill_trace_data(struct sk_buff *skb,
 		return;
 	}
 
-	__ioam6_fill_trace_data(skb, ns, trace, sc, sclen);
+	__ioam6_fill_trace_data(skb, ns, trace, sc, sclen, is_input);
 	trace->remlen -= trace->nodelen + sclen;
 }
 
-- 
2.25.1


  reply	other threads:[~2021-10-03 18:46 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-03 18:45 [PATCH net-next v2 0/4] Support for the ip6ip6 encapsulation of IOAM Justin Iurman
2021-10-03 18:45 ` Justin Iurman [this message]
2021-10-03 18:45 ` [PATCH net-next v2 2/4] ipv6: ioam: Prerequisite patch for ioam6_iptunnel Justin Iurman
2021-10-03 18:45 ` [PATCH net-next v2 3/4] ipv6: ioam: Add support for the ip6ip6 encapsulation Justin Iurman
2021-10-03 18:45 ` [PATCH net-next v2 4/4] selftests: net: Test for the IOAM encapsulation with IPv6 Justin Iurman
2021-10-04 12:20 ` [PATCH net-next v2 0/4] Support for the ip6ip6 encapsulation of IOAM patchwork-bot+netdevbpf

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