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print-mpls.c (190207) print-mpls.c (235530)
1/*
2 * Copyright (C) 2001 WIDE Project. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.

--- 40 unchanged lines hidden (view full) ---

49static const char *mpls_labelname[] = {
50/*0*/ "IPv4 explicit NULL", "router alert", "IPv6 explicit NULL",
51 "implicit NULL", "rsvd",
52/*5*/ "rsvd", "rsvd", "rsvd", "rsvd", "rsvd",
53/*10*/ "rsvd", "rsvd", "rsvd", "rsvd", "rsvd",
54/*15*/ "rsvd",
55};
56
1/*
2 * Copyright (C) 2001 WIDE Project. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.

--- 40 unchanged lines hidden (view full) ---

49static const char *mpls_labelname[] = {
50/*0*/ "IPv4 explicit NULL", "router alert", "IPv6 explicit NULL",
51 "implicit NULL", "rsvd",
52/*5*/ "rsvd", "rsvd", "rsvd", "rsvd", "rsvd",
53/*10*/ "rsvd", "rsvd", "rsvd", "rsvd", "rsvd",
54/*15*/ "rsvd",
55};
56
57enum mpls_packet_type {
58 PT_UNKNOWN,
59 PT_IPV4,
60 PT_IPV6,
61 PT_OSI
62};
63
57/*
58 * RFC3032: MPLS label stack encoding
59 */
60void
61mpls_print(const u_char *bp, u_int length)
62{
63 const u_char *p;
64 u_int32_t label_entry;
64/*
65 * RFC3032: MPLS label stack encoding
66 */
67void
68mpls_print(const u_char *bp, u_int length)
69{
70 const u_char *p;
71 u_int32_t label_entry;
65 u_int16_t label_stack_depth = 0;
72 u_int16_t label_stack_depth = 0;
73 enum mpls_packet_type pt = PT_UNKNOWN;
66
67 p = bp;
68 printf("MPLS");
69 do {
70 TCHECK2(*p, sizeof(label_entry));
71 label_entry = EXTRACT_32BITS(p);
72 printf("%s(label %u",
74
75 p = bp;
76 printf("MPLS");
77 do {
78 TCHECK2(*p, sizeof(label_entry));
79 label_entry = EXTRACT_32BITS(p);
80 printf("%s(label %u",
73 label_stack_depth ? "\n\t" : " ",
74 MPLS_LABEL(label_entry));
75 label_stack_depth++;
81 (label_stack_depth && vflag) ? "\n\t" : " ",
82 MPLS_LABEL(label_entry));
83 label_stack_depth++;
76 if (vflag &&
77 MPLS_LABEL(label_entry) < sizeof(mpls_labelname) / sizeof(mpls_labelname[0]))
78 printf(" (%s)", mpls_labelname[MPLS_LABEL(label_entry)]);
79 printf(", exp %u", MPLS_EXP(label_entry));
80 if (MPLS_STACK(label_entry))
81 printf(", [S]");
82 printf(", ttl %u)", MPLS_TTL(label_entry));
83
84 p += sizeof(label_entry);
85 } while (!MPLS_STACK(label_entry));
86
84 if (vflag &&
85 MPLS_LABEL(label_entry) < sizeof(mpls_labelname) / sizeof(mpls_labelname[0]))
86 printf(" (%s)", mpls_labelname[MPLS_LABEL(label_entry)]);
87 printf(", exp %u", MPLS_EXP(label_entry));
88 if (MPLS_STACK(label_entry))
89 printf(", [S]");
90 printf(", ttl %u)", MPLS_TTL(label_entry));
91
92 p += sizeof(label_entry);
93 } while (!MPLS_STACK(label_entry));
94
95 /*
96 * Try to figure out the packet type.
97 */
87 switch (MPLS_LABEL(label_entry)) {
98 switch (MPLS_LABEL(label_entry)) {
99
88 case 0: /* IPv4 explicit NULL label */
100 case 0: /* IPv4 explicit NULL label */
89 case 3: /* IPv4 implicit NULL label */
90 if (vflag>0) {
91 printf("\n\t");
92 ip_print(gndo, p, length - (p - bp));
93 }
94 else printf(", IP, length: %u",length);
101 case 3: /* IPv4 implicit NULL label */
102 pt = PT_IPV4;
95 break;
103 break;
96#ifdef INET6
104
97 case 2: /* IPv6 explicit NULL label */
105 case 2: /* IPv6 explicit NULL label */
98 if (vflag>0) {
99 printf("\n\t");
100 ip6_print(p, length - (p - bp));
101 }
102 else printf(", IPv6, length: %u",length);
106 pt = PT_IPV6;
103 break;
107 break;
104#endif
108
105 default:
106 /*
107 * Generally there's no indication of protocol in MPLS label
109 default:
110 /*
111 * Generally there's no indication of protocol in MPLS label
108 * encoding, however draft-hsmit-isis-aal5mux-00.txt describes
109 * a technique that looks at the first payload byte if the BOS (bottom of stack)
110 * bit is set and tries to determine the network layer protocol
111 * 0x45-0x4f is IPv4
112 * 0x60-0x6f is IPv6
113 * 0x81-0x83 is OSI (CLNP,ES-IS,IS-IS)
114 * this technique is sometimes known as NULL encapsulation
115 * and decoding is particularly useful for control-plane traffic [BGP]
116 * which cisco by default sends MPLS encapsulated
112 * encoding.
113 *
114 * However, draft-hsmit-isis-aal5mux-00.txt describes a
115 * technique for encapsulating IS-IS and IP traffic on the
116 * same ATM virtual circuit; you look at the first payload
117 * byte to determine the network layer protocol, based on
118 * the fact that
119 *
120 * 1) the first byte of an IP header is 0x45-0x4f
121 * for IPv4 and 0x60-0x6f for IPv6;
122 *
123 * 2) the first byte of an OSI CLNP packet is 0x81,
124 * the first byte of an OSI ES-IS packet is 0x82,
125 * and the first byte of an OSI IS-IS packet is
126 * 0x83;
127 *
128 * so the network layer protocol can be inferred from the
129 * first byte of the packet, if the protocol is one of the
130 * ones listed above.
131 *
132 * Cisco sends control-plane traffic MPLS-encapsulated in
133 * this fashion.
117 */
134 */
135 switch(*p) {
118
136
119 if (MPLS_STACK(label_entry)) { /* only do this if the stack bit is set */
120 switch(*p) {
121 case 0x45:
122 case 0x46:
123 case 0x47:
124 case 0x48:
125 case 0x49:
126 case 0x4a:
127 case 0x4b:
128 case 0x4c:
129 case 0x4d:
130 case 0x4e:
131 case 0x4f:
132 if (vflag>0) {
133 printf("\n\t");
134 ip_print(gndo, p, length - (p - bp));
135 }
136 else printf(", IP, length: %u",length);
137 break;
137 case 0x45:
138 case 0x46:
139 case 0x47:
140 case 0x48:
141 case 0x49:
142 case 0x4a:
143 case 0x4b:
144 case 0x4c:
145 case 0x4d:
146 case 0x4e:
147 case 0x4f:
148 pt = PT_IPV4;
149 break;
150
151 case 0x60:
152 case 0x61:
153 case 0x62:
154 case 0x63:
155 case 0x64:
156 case 0x65:
157 case 0x66:
158 case 0x67:
159 case 0x68:
160 case 0x69:
161 case 0x6a:
162 case 0x6b:
163 case 0x6c:
164 case 0x6d:
165 case 0x6e:
166 case 0x6f:
167 pt = PT_IPV6;
168 break;
169
170 case 0x81:
171 case 0x82:
172 case 0x83:
173 pt = PT_OSI;
174 break;
175
176 default:
177 /* ok bail out - we did not figure out what it is*/
178 break;
179 }
180 }
181
182 /*
183 * Print the payload.
184 */
185 if (pt == PT_UNKNOWN) {
186 if (!suppress_default_print)
187 default_print(p, length - (p - bp));
188 return;
189 }
190 if (vflag)
191 printf("\n\t");
192 else
193 printf(" ");
194 switch (pt) {
195
196 case PT_IPV4:
197 ip_print(gndo, p, length - (p - bp));
198 break;
199
200 case PT_IPV6:
138#ifdef INET6
201#ifdef INET6
139 case 0x60:
140 case 0x61:
141 case 0x62:
142 case 0x63:
143 case 0x64:
144 case 0x65:
145 case 0x66:
146 case 0x67:
147 case 0x68:
148 case 0x69:
149 case 0x6a:
150 case 0x6b:
151 case 0x6c:
152 case 0x6d:
153 case 0x6e:
154 case 0x6f:
155 if (vflag>0) {
156 printf("\n\t");
157 ip6_print(p, length - (p - bp));
158 }
159 else printf(", IPv6, length: %u",length);
160 break;
202 ip6_print(gndo, p, length - (p - bp));
203#else
204 printf("IPv6, length: %u", length);
161#endif
205#endif
162 case 0x81:
163 case 0x82:
164 case 0x83:
165 if (vflag>0) {
166 printf("\n\t");
167 isoclns_print(p, length - (p - bp), length - (p - bp));
168 }
169 else printf(", OSI, length: %u",length);
170 break;
171 default:
172 /* ok bail out - we did not figure out what it is*/
173 break;
174 }
175 }
176 return;
206 break;
207
208 case PT_OSI:
209 isoclns_print(p, length - (p - bp), length - (p - bp));
210 break;
211
212 default:
213 break;
177 }
214 }
215 return;
178
179trunc:
180 printf("[|MPLS]");
181}
182
183
184/*
185 * Local Variables:
186 * c-style: whitesmith
187 * c-basic-offset: 8
188 * End:
189 */
216
217trunc:
218 printf("[|MPLS]");
219}
220
221
222/*
223 * Local Variables:
224 * c-style: whitesmith
225 * c-basic-offset: 8
226 * End:
227 */