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26#include <stdio.h>
27#include <stdlib.h>
28#include <unistd.h>
29#include <fcntl.h>
30#include <sys/socket.h>
31#include <netinet/in.h>
32#include <netinet/ip.h>
33#include <arpa/inet.h>
34#include <string.h>
35#include <linux/types.h>
36#include <linux/if_addrlabel.h>
37
38#include "rt_names.h"
39#include "utils.h"
40#include "ip_common.h"
41#include "json_print.h"
42
43#define IFAL_RTA(r) ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrlblmsg))))
44#define IFAL_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifaddrlblmsg))
45
46extern struct rtnl_handle rth;
47
48static void usage(void) __attribute__((noreturn));
49
50static void usage(void)
51{
52 fprintf(stderr,
53 "Usage: ip addrlabel { add | del } prefix PREFIX [ dev DEV ] [ label LABEL ]\n"
54 " ip addrlabel [ list | flush | help ]\n");
55 exit(-1);
56}
57
58int print_addrlabel(struct nlmsghdr *n, void *arg)
59{
60 struct ifaddrlblmsg *ifal = NLMSG_DATA(n);
61 int len = n->nlmsg_len;
62 struct rtattr *tb[IFAL_MAX+1];
63
64 if (n->nlmsg_type != RTM_NEWADDRLABEL && n->nlmsg_type != RTM_DELADDRLABEL)
65 return 0;
66
67 len -= NLMSG_LENGTH(sizeof(*ifal));
68 if (len < 0)
69 return -1;
70
71 parse_rtattr(tb, IFAL_MAX, IFAL_RTA(ifal), len);
72
73 open_json_object(NULL);
74 if (n->nlmsg_type == RTM_DELADDRLABEL)
75 print_bool(PRINT_ANY, "deleted", "Deleted ", true);
76
77 if (tb[IFAL_ADDRESS]) {
78 const char *host
79 = format_host_rta(ifal->ifal_family,
80 tb[IFAL_ADDRESS]);
81
82 print_string(PRINT_FP, NULL, "prefix ", NULL);
83 print_color_string(PRINT_ANY,
84 ifa_family_color(ifal->ifal_family),
85 "address", "%s", host);
86
87 print_uint(PRINT_ANY, "prefixlen", "/%u ",
88 ifal->ifal_prefixlen);
89 }
90
91 if (ifal->ifal_index) {
92 print_string(PRINT_FP, NULL, "dev ", NULL);
93 print_color_string(PRINT_ANY, COLOR_IFNAME,
94 "ifname", "%s ",
95 ll_index_to_name(ifal->ifal_index));
96 }
97
98 if (tb[IFAL_LABEL] && RTA_PAYLOAD(tb[IFAL_LABEL]) == sizeof(uint32_t)) {
99 uint32_t label = rta_getattr_u32(tb[IFAL_LABEL]);
100
101 print_uint(PRINT_ANY,
102 "label", "label %u ", label);
103 }
104 print_string(PRINT_FP, NULL, "\n", "");
105 close_json_object();
106
107 return 0;
108}
109
110static int ipaddrlabel_list(int argc, char **argv)
111{
112 int af = preferred_family;
113
114 if (af == AF_UNSPEC)
115 af = AF_INET6;
116
117 if (argc > 0) {
118 fprintf(stderr, "\"ip addrlabel show\" does not take any arguments.\n");
119 return -1;
120 }
121
122 if (rtnl_addrlbldump_req(&rth, af) < 0) {
123 perror("Cannot send dump request");
124 return 1;
125 }
126
127 new_json_obj(json);
128 if (rtnl_dump_filter(&rth, print_addrlabel, stdout) < 0) {
129 fprintf(stderr, "Dump terminated\n");
130 return 1;
131 }
132 delete_json_obj();
133
134 return 0;
135}
136
137
138static int ipaddrlabel_modify(int cmd, int argc, char **argv)
139{
140 struct {
141 struct nlmsghdr n;
142 struct ifaddrlblmsg ifal;
143 char buf[1024];
144 } req = {
145 .n.nlmsg_type = cmd,
146 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrlblmsg)),
147 .n.nlmsg_flags = NLM_F_REQUEST,
148 .ifal.ifal_family = preferred_family,
149 };
150
151 inet_prefix prefix = {};
152 uint32_t label = 0xffffffffUL;
153 char *p = NULL;
154 char *l = NULL;
155
156 if (cmd == RTM_NEWADDRLABEL) {
157 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
158 }
159
160 while (argc > 0) {
161 if (strcmp(*argv, "prefix") == 0) {
162 NEXT_ARG();
163 p = *argv;
164 get_prefix(&prefix, *argv, preferred_family);
165 } else if (strcmp(*argv, "dev") == 0) {
166 NEXT_ARG();
167 if ((req.ifal.ifal_index = ll_name_to_index(*argv)) == 0)
168 invarg("dev is invalid\n", *argv);
169 } else if (strcmp(*argv, "label") == 0) {
170 NEXT_ARG();
171 l = *argv;
172 if (get_u32(&label, *argv, 0) || label == 0xffffffffUL)
173 invarg("label is invalid\n", *argv);
174 }
175 argc--;
176 argv++;
177 }
178 if (p == NULL) {
179 fprintf(stderr, "Not enough information: \"prefix\" argument is required.\n");
180 return -1;
181 }
182 if (l == NULL) {
183 fprintf(stderr, "Not enough information: \"label\" argument is required.\n");
184 return -1;
185 }
186 addattr32(&req.n, sizeof(req), IFAL_LABEL, label);
187 addattr_l(&req.n, sizeof(req), IFAL_ADDRESS, &prefix.data, prefix.bytelen);
188 req.ifal.ifal_prefixlen = prefix.bitlen;
189
190 if (req.ifal.ifal_family == AF_UNSPEC)
191 req.ifal.ifal_family = AF_INET6;
192
193 if (rtnl_talk(&rth, &req.n, NULL) < 0)
194 return -2;
195
196 return 0;
197}
198
199
200static int flush_addrlabel(struct nlmsghdr *n, void *arg)
201{
202 struct rtnl_handle rth2;
203 struct rtmsg *r = NLMSG_DATA(n);
204 int len = n->nlmsg_len;
205 struct rtattr *tb[IFAL_MAX+1];
206
207 len -= NLMSG_LENGTH(sizeof(*r));
208 if (len < 0)
209 return -1;
210
211 parse_rtattr(tb, IFAL_MAX, RTM_RTA(r), len);
212
213 if (tb[IFAL_ADDRESS]) {
214 n->nlmsg_type = RTM_DELADDRLABEL;
215 n->nlmsg_flags = NLM_F_REQUEST;
216
217 if (rtnl_open(&rth2, 0) < 0)
218 return -1;
219
220 if (rtnl_talk(&rth2, n, NULL) < 0)
221 return -2;
222
223 rtnl_close(&rth2);
224 }
225
226 return 0;
227}
228
229static int ipaddrlabel_flush(int argc, char **argv)
230{
231 int af = preferred_family;
232
233 if (af == AF_UNSPEC)
234 af = AF_INET6;
235
236 if (argc > 0) {
237 fprintf(stderr, "\"ip addrlabel flush\" does not allow extra arguments\n");
238 return -1;
239 }
240
241 if (rtnl_addrlbldump_req(&rth, af) < 0) {
242 perror("Cannot send dump request");
243 return -1;
244 }
245
246 if (rtnl_dump_filter(&rth, flush_addrlabel, NULL) < 0) {
247 fprintf(stderr, "Flush terminated\n");
248 return -1;
249 }
250
251 return 0;
252}
253
254int do_ipaddrlabel(int argc, char **argv)
255{
256 if (argc < 1) {
257 return ipaddrlabel_list(0, NULL);
258 } else if (matches(argv[0], "list") == 0 ||
259 matches(argv[0], "lst") == 0 ||
260 matches(argv[0], "show") == 0) {
261 return ipaddrlabel_list(argc-1, argv+1);
262 } else if (matches(argv[0], "add") == 0) {
263 return ipaddrlabel_modify(RTM_NEWADDRLABEL, argc-1, argv+1);
264 } else if (matches(argv[0], "delete") == 0) {
265 return ipaddrlabel_modify(RTM_DELADDRLABEL, argc-1, argv+1);
266 } else if (matches(argv[0], "flush") == 0) {
267 return ipaddrlabel_flush(argc-1, argv+1);
268 } else if (matches(argv[0], "help") == 0)
269 usage();
270
271 fprintf(stderr, "Command \"%s\" is unknown, try \"ip addrlabel help\".\n", *argv);
272 exit(-1);
273}
274
