bgpd: aspath list format binds on as-notation format

Each BGP prefix may have an as-path list attached. A forged
string is stored in the BGP attribute and shows the as-path
list output.

Before this commit, the as-path list output was expressed as
a list of AS values in plain format. Now, if a given BGP instance
uses a specific asnotation, then the output is changed:

new output:
router bgp 1.1 asnotation dot
!
 address-family ipv4 unicast
  network 10.200.0.0/24 route-map rmap
  network 10.201.0.0/24 route-map rmap
  redistribute connected route-map rmap
 exit-address-family
exit
!
route-map rmap permit 1
 set as-path prepend 1.1 5433.55 264564564
exit

ubuntu2004# do show bgp ipv4
BGP table version is 2, local router ID is 10.0.2.15, vrf id 0
Default local pref 100, local AS 1.1
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

    Network          Next Hop            Metric LocPrf Weight Path
 *> 4.4.4.4/32       0.0.0.0                  0         32768 1.1 5433.55 4036.61268 ?
 *> 10.0.2.0/24      0.0.0.0                  0         32768 1.1 5433.55 4036.61268 ?
    10.200.0.0/24    0.0.0.0                  0         32768 1.1 5433.55 4036.61268 i
    10.201.0.0/24    0.0.0.0                  0         32768 1.1 5433.55 4036.61268 i

The changes include:
- the aspath structure has a new field: asnotation type
The ashash list will differentiate 2 aspaths using a different
asnotation.
- 3 new printf extensions display the as number in the wished
format: pASP, pASD, pASE for plain, dot, or dot+ format (extended).

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/asn.h b/lib/asn.h
index 2884aafd5..902516ef7 100644
--- a/lib/asn.h
+++ b/lib/asn.h
@@ -24,6 +24,7 @@
 
 #include "zebra.h"
 #include "command_match.h"
+#include "json.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -48,6 +49,20 @@ extern enum match_type asn_str2asn_match(const char *str);
 extern bool asn_str2asn_notation(const char *asstring, as_t *asn,
 				 enum asnotation_mode *asnotation);
 extern const char *asn_mode2str(enum asnotation_mode asnotation);
+void asn_asn2json_array(json_object *jseg_list, as_t asn,
+			enum asnotation_mode asnotation);
+/* display AS in appropriate format */
+#ifdef _FRR_ATTRIBUTE_PRINTFRR
+#pragma FRR printfrr_ext "%pASP"  (as_t *)
+#pragma FRR printfrr_ext "%pASD"  (as_t *)
+#pragma FRR printfrr_ext "%pASE"  (as_t *)
+#endif
+
+#define ASN_FORMAT(mode)  \
+	((mode == ASNOTATION_DOT) ? "%pASD" :	    \
+	 ((mode == ASNOTATION_DOTPLUS) ? "%pASE" :	\
+	  "%pASP"))
+
 /* for test */
 extern void asn_relax_as_zero(bool relax);