From adb63cbe11726e8fa43f04251431ddbdaa0aa8e7 Mon Sep 17 00:00:00 2001
From: Neal Cardwell <ncardwell@google.com>
Date: Fri, 22 Nov 2013 20:39:42 -0500
Subject: [PATCH] net-test: packetdrill MPLS support: print MPLS label stacks
Code to print MPLS label stacks in a human-readable format matching
the script syntax:
mpls (label 123, tc 1, [S], ttl 255) (label 456, tc 1, [S], ttl 255)
Change-Id: I706be8aab089fbad79eabde67125345330728517
---
gtests/net/packetdrill/packet_to_string.c | 24 +++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/gtests/net/packetdrill/packet_to_string.c b/gtests/net/packetdrill/packet_to_string.c
index 64ab8f3c..fdc10dec 100644
--- a/gtests/net/packetdrill/packet_to_string.c
+++ b/gtests/net/packetdrill/packet_to_string.c
@@ -95,6 +95,29 @@ static int gre_header_to_string(FILE *s, struct packet *packet, int layer,
return STATUS_OK;
}
+static int mpls_header_to_string(FILE *s, struct packet *packet, int layer,
+ enum dump_format_t format, char **error)
+{
+ struct header *header = &packet->headers[layer];
+ int num_entries = header->header_bytes / sizeof(struct mpls);
+ int i = 0;
+
+ fprintf(s, "mpls");
+
+ for (i = 0; i < num_entries; ++i) {
+ const struct mpls *mpls = header->h.mpls + i;
+
+ fprintf(s, " (label %u, tc %u,%s ttl %u)",
+ mpls_entry_label(mpls),
+ mpls_entry_tc(mpls),
+ mpls_entry_stack(mpls) ? " [S]," : "",
+ mpls_entry_ttl(mpls));
+ }
+
+ fprintf(s, ": ");
+ return STATUS_OK;
+}
+
/* Print a string representation of the TCP packet:
* direction opt_ip_info flags seq ack window tcp_options
*/
@@ -197,6 +220,7 @@ static int encap_header_to_string(FILE *s, struct packet *packet, int layer,
[HEADER_IPV4] = ipv4_header_to_string,
[HEADER_IPV6] = ipv6_header_to_string,
[HEADER_GRE] = gre_header_to_string,
+ [HEADER_MPLS] = mpls_header_to_string,
};
header_to_string_func printer = NULL;
enum header_t type = packet->headers[layer].type;
--
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