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acddc0ed | 1 | // SPDX-License-Identifier: MIT |
ca10883e DS |
2 | /* |
3 | Copyright 2007, 2008 by Grégoire Henry, Julien Cristau and Juliusz Chroboczek | |
4 | Copyright 2011, 2012 by Matthieu Boutier and Juliusz Chroboczek | |
ca10883e DS |
5 | */ |
6 | ||
b45ac5f5 DL |
7 | #ifdef HAVE_CONFIG_H |
8 | #include "config.h" | |
9 | #endif | |
10 | ||
ca10883e DS |
11 | #include <sys/time.h> |
12 | #include <sys/param.h> | |
13 | #include <time.h> | |
14 | ||
15 | #include "babeld.h" | |
16 | ||
17 | ||
18 | #include <sys/types.h> | |
19 | #include <sys/socket.h> | |
20 | #include <netinet/in.h> | |
21 | #include <netdb.h> | |
22 | #include <arpa/inet.h> | |
23 | ||
24 | #include <zebra.h> | |
25 | #include "prefix.h" | |
26 | #include "zclient.h" | |
27 | #include "kernel.h" | |
28 | #include "privs.h" | |
29 | #include "command.h" | |
30 | #include "vty.h" | |
31 | #include "memory.h" | |
32 | #include "thread.h" | |
98c02f4c | 33 | #include "nexthop.h" |
ca10883e DS |
34 | |
35 | #include "util.h" | |
36 | #include "babel_interface.h" | |
37 | #include "babel_zebra.h" | |
38 | ||
39 | ||
40 | static int | |
c8f9e916 RW |
41 | zebra_route(int add, int familt, const unsigned char *pref, unsigned short plen, |
42 | const unsigned char *gate, int ifindex, unsigned int metric); | |
ca10883e DS |
43 | |
44 | int | |
45 | kernel_interface_operational(struct interface *interface) | |
46 | { | |
47 | return if_is_operative(interface); | |
48 | } | |
49 | ||
50 | int | |
51 | kernel_interface_mtu(struct interface *interface) | |
52 | { | |
53 | return MIN(interface->mtu, interface->mtu6); | |
54 | } | |
55 | ||
56 | int | |
57 | kernel_interface_wireless(struct interface *interface) | |
58 | { | |
59 | return 0; | |
60 | } | |
61 | ||
62 | int | |
e8c8f2e0 DS |
63 | kernel_route(enum babel_kernel_routes operation, const unsigned char *pref, |
64 | unsigned short plen, const unsigned char *gate, int ifindex, | |
65 | unsigned int metric, const unsigned char *newgate, int newifindex, | |
ca10883e DS |
66 | unsigned int newmetric) |
67 | { | |
68 | int rc; | |
c8f9e916 | 69 | int family; |
ca10883e DS |
70 | |
71 | /* Check that the protocol family is consistent. */ | |
72 | if(plen >= 96 && v4mapped(pref)) { | |
73 | if(!v4mapped(gate)) { | |
74 | errno = EINVAL; | |
75 | return -1; | |
76 | } | |
c8f9e916 | 77 | family = AF_INET; |
ca10883e DS |
78 | } else { |
79 | if(v4mapped(gate)) { | |
80 | errno = EINVAL; | |
81 | return -1; | |
82 | } | |
c8f9e916 | 83 | family = AF_INET6; |
ca10883e DS |
84 | } |
85 | ||
86 | switch (operation) { | |
87 | case ROUTE_ADD: | |
c8f9e916 | 88 | return zebra_route(1, family, pref, plen, gate, ifindex, metric); |
ca10883e | 89 | case ROUTE_FLUSH: |
c8f9e916 | 90 | return zebra_route(0, family, pref, plen, gate, ifindex, metric); |
ca10883e DS |
91 | case ROUTE_MODIFY: |
92 | if(newmetric == metric && memcmp(newgate, gate, 16) == 0 && | |
93 | newifindex == ifindex) | |
94 | return 0; | |
95 | debugf(BABEL_DEBUG_ROUTE, "Modify route: delete old; add new."); | |
c8f9e916 | 96 | rc = zebra_route(0, family, pref, plen, gate, ifindex, metric); |
ca10883e DS |
97 | if (rc < 0) |
98 | return -1; | |
99 | ||
c8f9e916 RW |
100 | rc = zebra_route(1, family, pref, plen, newgate, newifindex, |
101 | newmetric); | |
ca10883e | 102 | return rc; |
ca10883e | 103 | } |
e8c8f2e0 DS |
104 | |
105 | return 0; | |
ca10883e DS |
106 | } |
107 | ||
108 | static int | |
c8f9e916 RW |
109 | zebra_route(int add, int family, const unsigned char *pref, unsigned short plen, |
110 | const unsigned char *gate, int ifindex, unsigned int metric) | |
ca10883e | 111 | { |
98c02f4c DS |
112 | struct zapi_route api; /* quagga's communication system */ |
113 | struct prefix quagga_prefix; /* quagga's prefix */ | |
c8f9e916 RW |
114 | union g_addr babel_prefix_addr; /* babeld's prefix addr */ |
115 | struct zapi_nexthop *api_nh; /* next router to go - no ECMP */ | |
bb1b9c47 RW |
116 | |
117 | api_nh = &api.nexthops[0]; | |
ca10883e DS |
118 | |
119 | /* convert to be understandable by quagga */ | |
120 | /* convert given addresses */ | |
c8f9e916 RW |
121 | switch (family) { |
122 | case AF_INET: | |
123 | uchar_to_inaddr(&babel_prefix_addr.ipv4, pref); | |
124 | break; | |
125 | case AF_INET6: | |
126 | uchar_to_in6addr(&babel_prefix_addr.ipv6, pref); | |
127 | break; | |
ca10883e DS |
128 | } |
129 | ||
ca10883e DS |
130 | /* make prefix structure */ |
131 | memset (&quagga_prefix, 0, sizeof(quagga_prefix)); | |
c8f9e916 RW |
132 | quagga_prefix.family = family; |
133 | switch (family) { | |
134 | case AF_INET: | |
135 | IPV4_ADDR_COPY (&quagga_prefix.u.prefix4, &babel_prefix_addr.ipv4); | |
136 | /* our plen is for v4mapped's addr */ | |
137 | quagga_prefix.prefixlen = plen - 96; | |
138 | break; | |
139 | case AF_INET6: | |
140 | IPV6_ADDR_COPY (&quagga_prefix.u.prefix6, &babel_prefix_addr.ipv6); | |
141 | quagga_prefix.prefixlen = plen; | |
142 | break; | |
143 | } | |
98c02f4c | 144 | apply_mask(&quagga_prefix); |
ca10883e | 145 | |
e4d9c771 | 146 | memset(&api, 0, sizeof(api)); |
ca10883e | 147 | api.type = ZEBRA_ROUTE_BABEL; |
ca10883e | 148 | api.safi = SAFI_UNICAST; |
e4d9c771 | 149 | api.vrf_id = VRF_DEFAULT; |
bb1b9c47 | 150 | api.prefix = quagga_prefix; |
e4d9c771 | 151 | |
ca10883e | 152 | if(metric >= KERNEL_INFINITY) { |
09a484dd | 153 | zapi_route_set_blackhole(&api, BLACKHOLE_REJECT); |
ca10883e DS |
154 | } else { |
155 | SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP); | |
156 | api.nexthop_num = 1; | |
bb1b9c47 | 157 | api_nh->ifindex = ifindex; |
4a7371e9 DS |
158 | api_nh->vrf_id = VRF_DEFAULT; |
159 | switch (family) { | |
c8f9e916 RW |
160 | case AF_INET: |
161 | uchar_to_inaddr(&api_nh->gate.ipv4, gate); | |
12256b84 DA |
162 | if (IPV4_ADDR_SAME(&api_nh->gate.ipv4, &quagga_prefix.u.prefix4) |
163 | && quagga_prefix.prefixlen == IPV4_MAX_BITLEN) { | |
164 | api_nh->type = NEXTHOP_TYPE_IFINDEX; | |
165 | } else { | |
166 | api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX; | |
c8f9e916 RW |
167 | } |
168 | break; | |
169 | case AF_INET6: | |
170 | uchar_to_in6addr(&api_nh->gate.ipv6, gate); | |
171 | /* difference to IPv4: always leave the linklocal as nexthop */ | |
172 | api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX; | |
173 | break; | |
174 | } | |
ca10883e DS |
175 | SET_FLAG(api.message, ZAPI_MESSAGE_METRIC); |
176 | api.metric = metric; | |
177 | } | |
178 | ||
c8f9e916 RW |
179 | debugf(BABEL_DEBUG_ROUTE, "%s route (%s) to zebra", |
180 | add ? "adding" : "removing", | |
181 | (family == AF_INET) ? "ipv4" : "ipv6"); | |
0e51b4a3 RW |
182 | return zclient_route_send (add ? ZEBRA_ROUTE_ADD : ZEBRA_ROUTE_DELETE, |
183 | zclient, &api); | |
ca10883e DS |
184 | } |
185 | ||
186 | int | |
edb1d4a0 | 187 | if_eui64(int ifindex, unsigned char *eui) |
ca10883e DS |
188 | { |
189 | struct interface *ifp = if_lookup_by_index(ifindex, VRF_DEFAULT); | |
190 | if (ifp == NULL) { | |
191 | return -1; | |
192 | } | |
7217de2d | 193 | |
d7c0a89a | 194 | uint8_t len = (uint8_t)ifp->hw_addr_len; |
ca10883e | 195 | char *tmp = (void*) ifp->hw_addr; |
7217de2d | 196 | |
ca10883e DS |
197 | if (len == 8) { |
198 | memcpy(eui, tmp, 8); | |
199 | eui[0] ^= 2; | |
200 | } else if (len == 6) { | |
201 | memcpy(eui, tmp, 3); | |
202 | eui[3] = 0xFF; | |
203 | eui[4] = 0xFE; | |
204 | memcpy(eui+5, tmp+3, 3); | |
205 | } else { | |
206 | return -1; | |
207 | } | |
208 | return 0; | |
209 | } | |
210 | ||
211 | /* Like gettimeofday, but returns monotonic time. If POSIX clocks are not | |
212 | available, falls back to gettimeofday but enforces monotonicity. */ | |
c392d9f4 | 213 | void |
ca10883e DS |
214 | gettime(struct timeval *tv) |
215 | { | |
c392d9f4 | 216 | monotime(tv); |
ca10883e DS |
217 | } |
218 | ||
219 | /* If /dev/urandom doesn't exist, this will fail with ENOENT, which the | |
220 | caller will deal with gracefully. */ | |
221 | ||
222 | int | |
223 | read_random_bytes(void *buf, size_t len) | |
224 | { | |
225 | int fd; | |
226 | int rc; | |
227 | ||
228 | fd = open("/dev/urandom", O_RDONLY); | |
229 | if(fd < 0) { | |
230 | rc = -1; | |
231 | } else { | |
232 | rc = read(fd, buf, len); | |
233 | if(rc < 0 || (unsigned) rc < len) | |
234 | rc = -1; | |
235 | close(fd); | |
236 | } | |
237 | return rc; | |
238 | } |