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1 | /* BGP RD definitions for BGP-based VPNs (IP/EVPN) | |
2 | * -- brought over from bgpd/bgp_mplsvpn.c | |
3 | * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org> | |
4 | * | |
5 | * This file is part of FRR. | |
6 | * | |
7 | * FRR is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * FRR is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with FRR; see the file COPYING. If not, write to the Free | |
19 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | * 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #include <zebra.h> | |
24 | #include "command.h" | |
25 | #include "log.h" | |
26 | #include "prefix.h" | |
27 | #include "memory.h" | |
28 | #include "stream.h" | |
29 | #include "filter.h" | |
30 | #include "frrstr.h" | |
31 | ||
32 | #include "bgpd/bgpd.h" | |
33 | #include "bgpd/bgp_rd.h" | |
34 | #include "bgpd/bgp_attr.h" | |
35 | ||
36 | #ifdef ENABLE_BGP_VNC | |
37 | #include "bgpd/rfapi/rfapi_backend.h" | |
38 | #endif | |
39 | ||
40 | uint16_t decode_rd_type(const uint8_t *pnt) | |
41 | { | |
42 | uint16_t v; | |
43 | ||
44 | v = ((uint16_t)*pnt++ << 8); | |
45 | #ifdef ENABLE_BGP_VNC | |
46 | /* | |
47 | * VNC L2 stores LHI in lower byte, so omit it | |
48 | */ | |
49 | if (v != RD_TYPE_VNC_ETH) | |
50 | v |= (uint16_t)*pnt; | |
51 | #else /* duplicate code for clarity */ | |
52 | v |= (uint16_t)*pnt; | |
53 | #endif | |
54 | return v; | |
55 | } | |
56 | ||
57 | void encode_rd_type(uint16_t v, uint8_t *pnt) | |
58 | { | |
59 | *((uint16_t *)pnt) = htons(v); | |
60 | } | |
61 | ||
62 | /* type == RD_TYPE_AS */ | |
63 | void decode_rd_as(const uint8_t *pnt, struct rd_as *rd_as) | |
64 | { | |
65 | rd_as->as = (uint16_t)*pnt++ << 8; | |
66 | rd_as->as |= (uint16_t)*pnt++; | |
67 | ptr_get_be32(pnt, &rd_as->val); | |
68 | } | |
69 | ||
70 | /* type == RD_TYPE_AS4 */ | |
71 | void decode_rd_as4(const uint8_t *pnt, struct rd_as *rd_as) | |
72 | { | |
73 | pnt = ptr_get_be32(pnt, &rd_as->as); | |
74 | rd_as->val = ((uint16_t)*pnt++ << 8); | |
75 | rd_as->val |= (uint16_t)*pnt; | |
76 | } | |
77 | ||
78 | /* type == RD_TYPE_IP */ | |
79 | void decode_rd_ip(const uint8_t *pnt, struct rd_ip *rd_ip) | |
80 | { | |
81 | memcpy(&rd_ip->ip, pnt, 4); | |
82 | pnt += 4; | |
83 | ||
84 | rd_ip->val = ((uint16_t)*pnt++ << 8); | |
85 | rd_ip->val |= (uint16_t)*pnt; | |
86 | } | |
87 | ||
88 | #ifdef ENABLE_BGP_VNC | |
89 | /* type == RD_TYPE_VNC_ETH */ | |
90 | void decode_rd_vnc_eth(const uint8_t *pnt, struct rd_vnc_eth *rd_vnc_eth) | |
91 | { | |
92 | rd_vnc_eth->type = RD_TYPE_VNC_ETH; | |
93 | rd_vnc_eth->local_nve_id = pnt[1]; | |
94 | memcpy(rd_vnc_eth->macaddr.octet, pnt + 2, ETH_ALEN); | |
95 | } | |
96 | #endif | |
97 | ||
98 | int str2prefix_rd(const char *str, struct prefix_rd *prd) | |
99 | { | |
100 | int ret; /* ret of called functions */ | |
101 | int lret; /* local ret, of this func */ | |
102 | char *p; | |
103 | char *p2; | |
104 | struct stream *s = NULL; | |
105 | char *half = NULL; | |
106 | struct in_addr addr; | |
107 | ||
108 | s = stream_new(8); | |
109 | ||
110 | prd->family = AF_UNSPEC; | |
111 | prd->prefixlen = 64; | |
112 | ||
113 | lret = 0; | |
114 | p = strchr(str, ':'); | |
115 | if (!p) | |
116 | goto out; | |
117 | ||
118 | if (!all_digit(p + 1)) | |
119 | goto out; | |
120 | ||
121 | half = XMALLOC(MTYPE_TMP, (p - str) + 1); | |
122 | memcpy(half, str, (p - str)); | |
123 | half[p - str] = '\0'; | |
124 | ||
125 | p2 = strchr(str, '.'); | |
126 | ||
127 | if (!p2) { | |
128 | unsigned long as_val; | |
129 | ||
130 | if (!all_digit(half)) | |
131 | goto out; | |
132 | ||
133 | as_val = atol(half); | |
134 | if (as_val > 0xffff) { | |
135 | stream_putw(s, RD_TYPE_AS4); | |
136 | stream_putl(s, as_val); | |
137 | stream_putw(s, atol(p + 1)); | |
138 | } else { | |
139 | stream_putw(s, RD_TYPE_AS); | |
140 | stream_putw(s, as_val); | |
141 | stream_putl(s, atol(p + 1)); | |
142 | } | |
143 | } else { | |
144 | ret = inet_aton(half, &addr); | |
145 | if (!ret) | |
146 | goto out; | |
147 | ||
148 | stream_putw(s, RD_TYPE_IP); | |
149 | stream_put_in_addr(s, &addr); | |
150 | stream_putw(s, atol(p + 1)); | |
151 | } | |
152 | memcpy(prd->val, s->data, 8); | |
153 | lret = 1; | |
154 | ||
155 | out: | |
156 | if (s) | |
157 | stream_free(s); | |
158 | XFREE(MTYPE_TMP, half); | |
159 | return lret; | |
160 | } | |
161 | ||
162 | char *prefix_rd2str(const struct prefix_rd *prd, char *buf, size_t size) | |
163 | { | |
164 | const uint8_t *pnt; | |
165 | uint16_t type; | |
166 | struct rd_as rd_as; | |
167 | struct rd_ip rd_ip; | |
168 | ||
169 | assert(size >= RD_ADDRSTRLEN); | |
170 | ||
171 | pnt = prd->val; | |
172 | ||
173 | type = decode_rd_type(pnt); | |
174 | ||
175 | if (type == RD_TYPE_AS) { | |
176 | decode_rd_as(pnt + 2, &rd_as); | |
177 | snprintf(buf, size, "%u:%u", rd_as.as, rd_as.val); | |
178 | return buf; | |
179 | } else if (type == RD_TYPE_AS4) { | |
180 | decode_rd_as4(pnt + 2, &rd_as); | |
181 | snprintf(buf, size, "%u:%u", rd_as.as, rd_as.val); | |
182 | return buf; | |
183 | } else if (type == RD_TYPE_IP) { | |
184 | decode_rd_ip(pnt + 2, &rd_ip); | |
185 | snprintf(buf, size, "%s:%hu", inet_ntoa(rd_ip.ip), | |
186 | rd_ip.val); | |
187 | return buf; | |
188 | } | |
189 | #ifdef ENABLE_BGP_VNC | |
190 | else if (type == RD_TYPE_VNC_ETH) { | |
191 | snprintf(buf, size, "LHI:%d, %02x:%02x:%02x:%02x:%02x:%02x", | |
192 | *(pnt + 1), /* LHI */ | |
193 | *(pnt + 2), /* MAC[0] */ | |
194 | *(pnt + 3), *(pnt + 4), *(pnt + 5), *(pnt + 6), | |
195 | *(pnt + 7)); | |
196 | ||
197 | return buf; | |
198 | } | |
199 | #endif | |
200 | ||
201 | snprintf(buf, size, "Unknown Type: %d", type); | |
202 | return buf; | |
203 | } | |
204 | ||
205 | void form_auto_rd(struct in_addr router_id, | |
206 | uint16_t rd_id, | |
207 | struct prefix_rd *prd) | |
208 | { | |
209 | char buf[100]; | |
210 | ||
211 | prd->family = AF_UNSPEC; | |
212 | prd->prefixlen = 64; | |
213 | snprintf(buf, sizeof(buf), "%s:%hu", inet_ntoa(router_id), rd_id); | |
214 | (void)str2prefix_rd(buf, prd); | |
215 | } |