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4852ba75 ND |
1 | /* |
2 | * ipnetconf.c "ip netconf". | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Nicolas Dichtel, <nicolas.dichtel@6wind.com> | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <unistd.h> | |
16 | #include <syslog.h> | |
17 | #include <fcntl.h> | |
18 | #include <string.h> | |
19 | #include <sys/time.h> | |
20 | #include <sys/socket.h> | |
21 | #include <netinet/in.h> | |
22 | ||
23 | #include "rt_names.h" | |
24 | #include "utils.h" | |
25 | #include "ip_common.h" | |
26 | ||
27 | static struct | |
28 | { | |
29 | int family; | |
30 | int ifindex; | |
31 | } filter; | |
32 | ||
33 | static void usage(void) __attribute__((noreturn)); | |
34 | ||
35 | static void usage(void) | |
36 | { | |
37 | fprintf(stderr, "Usage: ip netconf show [ dev STRING ]\n"); | |
38 | exit(-1); | |
39 | } | |
40 | ||
41 | #define NETCONF_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct netconfmsg)))) | |
42 | ||
0628cddd ND |
43 | int print_netconf(const struct sockaddr_nl *who, struct rtnl_ctrl_data *ctrl, |
44 | struct nlmsghdr *n, void *arg) | |
4852ba75 ND |
45 | { |
46 | FILE *fp = (FILE*)arg; | |
47 | struct netconfmsg *ncm = NLMSG_DATA(n); | |
48 | int len = n->nlmsg_len; | |
49 | struct rtattr *tb[NETCONFA_MAX+1]; | |
50 | ||
51 | if (n->nlmsg_type == NLMSG_ERROR) | |
52 | return -1; | |
53 | if (n->nlmsg_type != RTM_NEWNETCONF) { | |
54 | fprintf(stderr, "Not RTM_NEWNETCONF: %08x %08x %08x\n", | |
55 | n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags); | |
56 | ||
57 | return -1; | |
58 | } | |
59 | len -= NLMSG_SPACE(sizeof(*ncm)); | |
60 | if (len < 0) { | |
61 | fprintf(stderr, "BUG: wrong nlmsg len %d\n", len); | |
62 | return -1; | |
63 | } | |
64 | ||
65 | if (filter.family && filter.family != ncm->ncm_family) | |
66 | return 0; | |
67 | ||
68 | parse_rtattr(tb, NETCONFA_MAX, NETCONF_RTA(ncm), | |
69 | NLMSG_PAYLOAD(n, sizeof(*ncm))); | |
70 | ||
71 | switch (ncm->ncm_family) { | |
72 | case AF_INET: | |
73 | fprintf(fp, "ipv4 "); | |
74 | break; | |
75 | case AF_INET6: | |
76 | fprintf(fp, "ipv6 "); | |
77 | break; | |
78 | default: | |
79 | fprintf(fp, "unknown "); | |
80 | break; | |
81 | } | |
82 | ||
83 | if (tb[NETCONFA_IFINDEX]) { | |
84 | int *ifindex = (int *)RTA_DATA(tb[NETCONFA_IFINDEX]); | |
85 | ||
86 | switch (*ifindex) { | |
87 | case NETCONFA_IFINDEX_ALL: | |
88 | fprintf(fp, "all "); | |
89 | break; | |
90 | case NETCONFA_IFINDEX_DEFAULT: | |
91 | fprintf(fp, "default "); | |
92 | break; | |
93 | default: | |
94 | fprintf(fp, "dev %s ", ll_index_to_name(*ifindex)); | |
95 | break; | |
96 | } | |
97 | } | |
98 | ||
99 | if (tb[NETCONFA_FORWARDING]) | |
100 | fprintf(fp, "forwarding %s ", | |
101 | *(int *)RTA_DATA(tb[NETCONFA_FORWARDING])?"on":"off"); | |
102 | if (tb[NETCONFA_RP_FILTER]) { | |
103 | int rp_filter = *(int *)RTA_DATA(tb[NETCONFA_RP_FILTER]); | |
104 | ||
105 | if (rp_filter == 0) | |
106 | fprintf(fp, "rp_filter off "); | |
107 | else if (rp_filter == 1) | |
108 | fprintf(fp, "rp_filter strict "); | |
109 | else if (rp_filter == 2) | |
110 | fprintf(fp, "rp_filter loose "); | |
111 | else | |
112 | fprintf(fp, "rp_filter unknown mode "); | |
113 | } | |
114 | if (tb[NETCONFA_MC_FORWARDING]) | |
115 | fprintf(fp, "mc_forwarding %d ", | |
116 | *(int *)RTA_DATA(tb[NETCONFA_MC_FORWARDING])); | |
117 | ||
29cc8640 SH |
118 | if (tb[NETCONFA_PROXY_NEIGH]) |
119 | fprintf(fp, "proxy_neigh %s ", | |
120 | *(int *)RTA_DATA(tb[NETCONFA_PROXY_NEIGH])?"on":"off"); | |
121 | ||
4852ba75 ND |
122 | fprintf(fp, "\n"); |
123 | fflush(fp); | |
124 | return 0; | |
125 | } | |
126 | ||
0628cddd ND |
127 | static int print_netconf2(const struct sockaddr_nl *who, |
128 | struct nlmsghdr *n, void *arg) | |
129 | { | |
130 | return print_netconf(who, NULL, n, arg); | |
131 | } | |
132 | ||
093b7646 | 133 | void ipnetconf_reset_filter(int ifindex) |
4852ba75 ND |
134 | { |
135 | memset(&filter, 0, sizeof(filter)); | |
093b7646 | 136 | filter.ifindex = ifindex; |
4852ba75 ND |
137 | } |
138 | ||
d1f28cf1 | 139 | static int do_show(int argc, char **argv) |
4852ba75 ND |
140 | { |
141 | struct { | |
142 | struct nlmsghdr n; | |
143 | struct netconfmsg ncm; | |
144 | char buf[1024]; | |
145 | } req; | |
146 | ||
093b7646 | 147 | ipnetconf_reset_filter(0); |
4852ba75 ND |
148 | filter.family = preferred_family; |
149 | if (filter.family == AF_UNSPEC) | |
150 | filter.family = AF_INET; | |
4852ba75 ND |
151 | |
152 | while (argc > 0) { | |
153 | if (strcmp(*argv, "dev") == 0) { | |
154 | NEXT_ARG(); | |
155 | filter.ifindex = ll_name_to_index(*argv); | |
156 | if (filter.ifindex <= 0) { | |
157 | fprintf(stderr, "Device \"%s\" does not exist.\n", | |
158 | *argv); | |
159 | return -1; | |
160 | } | |
161 | } | |
162 | argv++; argc--; | |
163 | } | |
164 | ||
165 | ll_init_map(&rth); | |
f7431e29 ND |
166 | if (filter.ifindex) { |
167 | memset(&req, 0, sizeof(req)); | |
168 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct netconfmsg)); | |
169 | req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK; | |
170 | req.n.nlmsg_type = RTM_GETNETCONF; | |
171 | req.ncm.ncm_family = filter.family; | |
172 | if (filter.ifindex) | |
173 | addattr_l(&req.n, sizeof(req), NETCONFA_IFINDEX, | |
174 | &filter.ifindex, sizeof(filter.ifindex)); | |
175 | ||
d2468da0 SH |
176 | if (rtnl_send(&rth, &req.n, req.n.nlmsg_len) < 0) { |
177 | perror("Can not send request"); | |
178 | exit(1); | |
179 | } | |
f7431e29 ND |
180 | rtnl_listen(&rth, print_netconf, stdout); |
181 | } else { | |
182 | dump: | |
183 | if (rtnl_wilddump_request(&rth, filter.family, RTM_GETNETCONF) < 0) { | |
184 | perror("Cannot send dump request"); | |
185 | exit(1); | |
186 | } | |
0628cddd | 187 | if (rtnl_dump_filter(&rth, print_netconf2, stdout) < 0) { |
f7431e29 ND |
188 | fprintf(stderr, "Dump terminated\n"); |
189 | exit(1); | |
190 | } | |
191 | if (preferred_family == AF_UNSPEC) { | |
192 | preferred_family = AF_INET6; | |
193 | filter.family = AF_INET6; | |
194 | goto dump; | |
195 | } | |
196 | } | |
4852ba75 ND |
197 | return 0; |
198 | } | |
199 | ||
200 | int do_ipnetconf(int argc, char **argv) | |
201 | { | |
202 | if (argc > 0) { | |
203 | if (matches(*argv, "show") == 0 || | |
204 | matches(*argv, "lst") == 0 || | |
205 | matches(*argv, "list") == 0) | |
206 | return do_show(argc-1, argv+1); | |
207 | if (matches(*argv, "help") == 0) | |
208 | usage(); | |
209 | } else | |
210 | return do_show(0, NULL); | |
211 | ||
212 | fprintf(stderr, "Command \"%s\" is unknown, try \"ip netconf help\".\n", *argv); | |
213 | exit(-1); | |
214 | } |