lib, bgp: add initial support for asdot format

AS number can be defined as an unsigned long number, or
two uint16 values separated by a period (.). The possible
valus are:
- usual 32 bit values : [1;2^32 -1]
- <1.65535>.<0.65535> for dot notation
- <0.65535>.<0.65535> for dot+ notation.

The 0.0 value is forbidden when configuring BGP instances
or peer configurations.

A new ASN type is added for parsing in the vty.
The following commands use that new identifier:
- router bgp ..
- bgp confederation ..
- neighbor <> remote-as <>
- neighbor <> local-as <>
- clear ip bgp <>
- route-map / set as-path <>

An asn library is available in lib/ and provides some
services:
- convert an as string into an as number.
- parse an as path list string and extract a number.
- convert an as number into a string.

Also, the bgp tests forge an as_zero_path, and to do that,
an API to relax the possibility to have a 0 as value is
specifically called from the tests.

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

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/command_match.c b/lib/command_match.c
index 6c1d05d926..3318e2c7e6 100644
--- a/lib/command_match.c
+++ b/lib/command_match.c
@@ -25,6 +25,7 @@
 
 #include "command_match.h"
 #include "memory.h"
+#include "asn.h"
 
 DEFINE_MTYPE_STATIC(LIB, CMD_MATCHSTACK, "Command Match Stack");
 
@@ -556,6 +557,7 @@ static enum match_type min_match_level(enum cmd_token_type type)
 	case END_TKN:
 	case NEG_ONLY_TKN:
 	case VARIABLE_TKN:
+	case ASNUM_TKN:
 		return exact_match;
 	}
 
@@ -579,6 +581,7 @@ static int score_precedence(enum cmd_token_type type)
 	case IPV6_PREFIX_TKN:
 	case MAC_TKN:
 	case MAC_PREFIX_TKN:
+	case ASNUM_TKN:
 	case RANGE_TKN:
 		return 2;
 	case WORD_TKN:
@@ -713,6 +716,8 @@ static enum match_type match_token(struct cmd_token *token, char *input_token)
 		return match_mac(input_token, false);
 	case MAC_PREFIX_TKN:
 		return match_mac(input_token, true);
+	case ASNUM_TKN:
+		return asn_str2asn_match(input_token);
 	case END_TKN:
 	case FORK_TKN:
 	case JOIN_TKN:
@@ -855,7 +860,6 @@ static enum match_type match_ipv4_prefix(const char *str)
 	return exact_match;
 }
 
-
 #define IPV6_ADDR_STR   "0123456789abcdefABCDEF:."
 #define IPV6_PREFIX_STR "0123456789abcdefABCDEF:./"
 #define STATE_START     1