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e9e2c950 RZ |
1 | /* |
2 | * *BSD specific code | |
3 | * | |
4 | * Copyright (C) 2018 Network Device Education Foundation, Inc. ("NetDEF") | |
5 | * | |
6 | * FRR is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * FRR is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with FRR; see the file COPYING. If not, write to the Free | |
18 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
19 | * 02111-1307, USA. | |
20 | */ | |
21 | ||
22 | #include <zebra.h> | |
23 | ||
24 | #ifdef BFD_BSD | |
25 | ||
26 | #include <net/if.h> | |
27 | #include <net/if_types.h> | |
28 | #include <sys/types.h> | |
29 | #include <sys/socket.h> | |
30 | ||
31 | #include <ifaddrs.h> | |
32 | ||
33 | #include "bfd.h" | |
34 | ||
35 | /* | |
36 | * Prototypes | |
37 | */ | |
38 | static const char *sockaddr_to_string(const void *sv, char *buf, size_t buflen); | |
39 | ||
40 | /* | |
41 | * Definitions. | |
42 | */ | |
43 | static const char *sockaddr_to_string(const void *sv, char *buf, size_t buflen) | |
44 | { | |
45 | const struct sockaddr *sa = sv; | |
46 | const struct sockaddr_in *sin = sv; | |
47 | const struct sockaddr_in6 *sin6 = sv; | |
48 | int unknown = 1; | |
49 | ||
50 | switch (sa->sa_family) { | |
51 | case AF_INET: | |
52 | if (inet_ntop(AF_INET, &sin->sin_addr, buf, buflen) != NULL) | |
53 | unknown = 0; | |
54 | break; | |
55 | ||
56 | case AF_INET6: | |
57 | if (inet_ntop(AF_INET6, &sin6->sin6_addr, buf, buflen) != NULL) | |
58 | unknown = 0; | |
59 | break; | |
60 | } | |
61 | if (unknown == 0) | |
62 | return buf; | |
63 | ||
64 | snprintf(buf, buflen, "unknown (af=%d)", sa->sa_family); | |
65 | return buf; | |
66 | } | |
67 | ||
68 | int ptm_bfd_fetch_ifindex(const char *ifname) | |
69 | { | |
70 | return if_nametoindex(ifname); | |
71 | } | |
72 | ||
73 | void ptm_bfd_fetch_local_mac(const char *ifname, uint8_t *mac) | |
74 | { | |
75 | struct ifaddrs *ifap, *ifa; | |
76 | struct if_data *ifi; | |
77 | struct sockaddr_dl *sdl; | |
78 | size_t maclen; | |
79 | ||
80 | /* Always clean the target, zeroed macs mean failure. */ | |
81 | memset(mac, 0, ETHERNET_ADDRESS_LENGTH); | |
82 | ||
83 | if (getifaddrs(&ifap) != 0) | |
84 | return; | |
85 | ||
86 | for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { | |
87 | /* Find interface with that name. */ | |
88 | if (strcmp(ifa->ifa_name, ifname) != 0) | |
89 | continue; | |
90 | /* Skip non link addresses. We want the MAC address. */ | |
91 | if (ifa->ifa_addr->sa_family != AF_LINK) | |
92 | continue; | |
93 | ||
94 | sdl = (struct sockaddr_dl *)ifa->ifa_addr; | |
95 | ifi = (struct if_data *)ifa->ifa_data; | |
96 | /* Skip non ethernet related data. */ | |
97 | if (ifi->ifi_type != IFT_ETHER) | |
98 | continue; | |
99 | ||
100 | if (sdl->sdl_alen != ETHERNET_ADDRESS_LENGTH) | |
101 | log_warning("%s:%d mac address length %d (expected %d)", | |
102 | __func__, __LINE__, sdl->sdl_alen, | |
103 | ETHERNET_ADDRESS_LENGTH); | |
104 | ||
105 | maclen = (sdl->sdl_alen > ETHERNET_ADDRESS_LENGTH) | |
106 | ? ETHERNET_ADDRESS_LENGTH | |
107 | : sdl->sdl_alen; | |
108 | memcpy(mac, LLADDR(sdl), maclen); | |
109 | break; | |
110 | } | |
111 | ||
112 | freeifaddrs(ifap); | |
113 | } | |
114 | ||
115 | ||
116 | /* Was _fetch_portname_from_ifindex() */ | |
117 | void fetch_portname_from_ifindex(int ifindex, char *ifname, size_t ifnamelen) | |
118 | { | |
119 | char ifname_tmp[IF_NAMESIZE]; | |
120 | ||
121 | /* Set ifname to empty to signalize failures. */ | |
122 | memset(ifname, 0, ifnamelen); | |
123 | ||
124 | if (if_indextoname(ifindex, ifname_tmp) == NULL) | |
125 | return; | |
126 | ||
127 | if (strlcpy(ifname, ifname_tmp, ifnamelen) > ifnamelen) | |
128 | log_warning("%s:%d interface name truncated", __func__, | |
129 | __LINE__); | |
130 | } | |
131 | ||
132 | int ptm_bfd_echo_sock_init(void) | |
133 | { | |
134 | int s, ttl, yes = 1; | |
135 | struct sockaddr_in sin; | |
136 | ||
137 | s = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC); | |
138 | if (s == -1) { | |
03e7f088 | 139 | log_error("echo-socket: creation failed: %s", strerror(errno)); |
e9e2c950 RZ |
140 | return -1; |
141 | } | |
142 | ||
143 | memset(&sin, 0, sizeof(sin)); | |
144 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
145 | /* OmniOS doesn't have this field, but uses this code. */ | |
146 | sin.sin_len = sizeof(sin); | |
147 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
148 | sin.sin_family = AF_INET; | |
149 | sin.sin_port = htons(3785); | |
150 | if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) == -1) { | |
03e7f088 | 151 | log_error("echo-socket: bind failure: %s", strerror(errno)); |
e9e2c950 RZ |
152 | close(s); |
153 | return -1; | |
154 | } | |
155 | ||
156 | if (setsockopt(s, IPPROTO_IP, IP_RECVTTL, &yes, sizeof(yes)) == -1) { | |
03e7f088 | 157 | log_error("echo-socket: setsockopt(IP_RECVTTL): %s", |
e9e2c950 RZ |
158 | strerror(errno)); |
159 | close(s); | |
160 | return -1; | |
161 | } | |
162 | ||
163 | ttl = BFD_TTL_VAL; | |
164 | if (setsockopt(s, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) == -1) { | |
03e7f088 | 165 | log_error("echo-socket: setsockopt(IP_TTL): %s", |
e9e2c950 RZ |
166 | strerror(errno)); |
167 | close(s); | |
168 | return -1; | |
169 | } | |
170 | ||
171 | return s; | |
172 | } | |
173 | ||
174 | ssize_t bsd_echo_sock_read(int sd, uint8_t *buf, ssize_t *buflen, | |
175 | struct sockaddr_storage *ss, socklen_t *sslen, | |
176 | uint8_t *ttl, uint32_t *id) | |
177 | { | |
178 | struct cmsghdr *cmsg; | |
179 | struct bfd_echo_pkt *bep; | |
180 | ssize_t readlen; | |
181 | struct iovec iov; | |
182 | struct msghdr msg; | |
183 | uint8_t msgctl[255]; | |
184 | char errbuf[255]; | |
185 | ||
186 | /* Prepare socket read. */ | |
187 | memset(ss, 0, sizeof(*ss)); | |
188 | memset(&msg, 0, sizeof(msg)); | |
189 | iov.iov_base = buf; | |
190 | iov.iov_len = *buflen; | |
191 | msg.msg_iov = &iov; | |
192 | msg.msg_iovlen = 1; | |
193 | msg.msg_control = msgctl; | |
194 | msg.msg_controllen = sizeof(msgctl); | |
195 | msg.msg_name = ss; | |
196 | msg.msg_namelen = *sslen; | |
197 | ||
198 | /* Read the socket and treat errors. */ | |
199 | readlen = recvmsg(sd, &msg, 0); | |
200 | if (readlen == 0) { | |
201 | log_error("%s: recvmsg: socket closed", __func__); | |
202 | return -1; | |
203 | } | |
204 | if (readlen == -1) { | |
205 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) | |
206 | return -1; | |
207 | ||
208 | log_error("%s: recvmsg: (%d) %s", __func__, errno, | |
209 | strerror(errno)); | |
210 | return -1; | |
211 | } | |
212 | /* Short packet, better not risk reading it. */ | |
213 | if (readlen < (ssize_t)sizeof(*bep)) { | |
214 | log_warning("%s: short packet (%ld of %d) from %s", __func__, | |
215 | readlen, sizeof(*bep), | |
216 | sockaddr_to_string(ss, errbuf, sizeof(errbuf))); | |
217 | return -1; | |
218 | } | |
219 | *buflen = readlen; | |
220 | ||
221 | /* Read TTL information. */ | |
222 | *ttl = 0; | |
223 | for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; | |
224 | cmsg = CMSG_NXTHDR(&msg, cmsg)) { | |
225 | if (cmsg->cmsg_level != IPPROTO_IP) | |
226 | continue; | |
227 | if (cmsg->cmsg_type != IP_RECVTTL) | |
228 | continue; | |
229 | ||
230 | *ttl = *(uint8_t *)CMSG_DATA(cmsg); | |
231 | break; | |
232 | } | |
233 | if (*ttl == 0) { | |
234 | log_debug("%s: failed to read TTL", __func__); | |
235 | return -1; | |
236 | } | |
237 | ||
238 | /* Read my discriminator from BFD Echo packet. */ | |
239 | bep = (struct bfd_echo_pkt *)buf; | |
240 | *id = bep->my_discr; | |
241 | if (*id == 0) { | |
242 | log_debug("%s: invalid packet discriminator from: %s", __func__, | |
243 | sockaddr_to_string(ss, errbuf, sizeof(errbuf))); | |
244 | return -1; | |
245 | } | |
246 | ||
247 | /* Set the returned sockaddr new length. */ | |
248 | *sslen = msg.msg_namelen; | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | int ptm_bfd_vxlan_sock_init(void) | |
254 | { | |
255 | /* TODO: not supported yet. */ | |
256 | return -1; | |
257 | } | |
258 | ||
259 | int bp_bind_dev(int sd, const char *dev) | |
260 | { | |
261 | /* | |
262 | * *BSDs don't support `SO_BINDTODEVICE`, instead you must | |
263 | * manually specify the main address of the interface or use | |
264 | * BPF on the socket descriptor. | |
265 | */ | |
266 | return 0; | |
267 | } | |
268 | ||
269 | uint16_t udp4_checksum(struct ip *ip, uint8_t *buf, int len) | |
270 | { | |
271 | char *ptr; | |
272 | struct udp_psuedo_header pudp_hdr; | |
273 | uint16_t csum; | |
274 | ||
275 | pudp_hdr.saddr = ip->ip_src.s_addr; | |
276 | pudp_hdr.daddr = ip->ip_dst.s_addr; | |
277 | pudp_hdr.reserved = 0; | |
278 | pudp_hdr.protocol = ip->ip_p; | |
279 | pudp_hdr.len = htons(len); | |
280 | ||
281 | ptr = XMALLOC(MTYPE_BFDD_TMP, UDP_PSUEDO_HDR_LEN + len); | |
282 | memcpy(ptr, &pudp_hdr, UDP_PSUEDO_HDR_LEN); | |
283 | memcpy(ptr + UDP_PSUEDO_HDR_LEN, buf, len); | |
284 | ||
285 | csum = checksum((uint16_t *)ptr, UDP_PSUEDO_HDR_LEN + len); | |
286 | XFREE(MTYPE_BFDD_TMP, ptr); | |
287 | return csum; | |
288 | } | |
289 | ||
290 | #endif /* BFD_BSD */ |