rt-link.c

  1// SPDX-License-Identifier: GPL-2.0
  2#include <stdio.h>
  3#include <string.h>
  4
  5#include <ynl.h>
  6
  7#include <arpa/inet.h>
  8#include <net/if.h>
  9
 10#include "rt-link-user.h"
 11
 12static void rt_link_print(struct rt_link_getlink_rsp *r)
 13{
 14	unsigned int i;
 15
 16	printf("%3d: ", r->_hdr.ifi_index);
 17
 18	if (r->_len.ifname)
 19		printf("%16s: ", r->ifname);
 20
 21	if (r->_present.mtu)
 22		printf("mtu %5d  ", r->mtu);
 23
 24	if (r->linkinfo._len.kind)
 25		printf("kind %-8s  ", r->linkinfo.kind);
 26	else
 27		printf("     %8s  ", "");
 28
 29	if (r->prop_list._count.alt_ifname) {
 30		printf("altname ");
 31		for (i = 0; i < r->prop_list._count.alt_ifname; i++)
 32			printf("%s ", r->prop_list.alt_ifname[i]->str);
 33		printf(" ");
 34	}
 35
 36	if (r->linkinfo._present.data && r->linkinfo.data._present.netkit) {
 37		struct rt_link_linkinfo_netkit_attrs *netkit;
 38		const char *name;
 39
 40		netkit = &r->linkinfo.data.netkit;
 41		printf("primary %d  ", netkit->primary);
 42
 43		name = NULL;
 44		if (netkit->_present.policy)
 45			name = rt_link_netkit_policy_str(netkit->policy);
 46		if (name)
 47			printf("policy %s  ", name);
 48	}
 49
 50	printf("\n");
 51}
 52
 53static int rt_link_create_netkit(struct ynl_sock *ys)
 54{
 55	struct rt_link_getlink_ntf *ntf_gl;
 56	struct rt_link_newlink_req *req;
 57	struct ynl_ntf_base_type *ntf;
 58	int ret;
 59
 60	req = rt_link_newlink_req_alloc();
 61	if (!req) {
 62		fprintf(stderr, "Can't alloc req\n");
 63		return -1;
 64	}
 65
 66	/* rtnetlink doesn't provide info about the created object.
 67	 * It expects us to set the ECHO flag and the dig the info out
 68	 * of the notifications...
 69	 */
 70	rt_link_newlink_req_set_nlflags(req, NLM_F_CREATE | NLM_F_ECHO);
 71
 72	rt_link_newlink_req_set_linkinfo_kind(req, "netkit");
 73
 74	/* Test error messages */
 75	rt_link_newlink_req_set_linkinfo_data_netkit_policy(req, 10);
 76	ret = rt_link_newlink(ys, req);
 77	if (ret) {
 78		printf("Testing error message for policy being bad:\n\t%s\n", ys->err.msg);
 79	} else {
 80		fprintf(stderr,	"Warning: unexpected success creating netkit with bad attrs\n");
 81		goto created;
 82	}
 83
 84	rt_link_newlink_req_set_linkinfo_data_netkit_policy(req, NETKIT_DROP);
 85
 86	ret = rt_link_newlink(ys, req);
 87created:
 88	rt_link_newlink_req_free(req);
 89	if (ret) {
 90		fprintf(stderr, "YNL: %s\n", ys->err.msg);
 91		return -1;
 92	}
 93
 94	if (!ynl_has_ntf(ys)) {
 95		fprintf(stderr,
 96			"Warning: interface created but received no notification, won't delete the interface\n");
 97		return 0;
 98	}
 99
100	ntf = ynl_ntf_dequeue(ys);
101	if (ntf->cmd !=	RTM_NEWLINK) {
102		fprintf(stderr,
103			"Warning: unexpected notification type, won't delete the interface\n");
104		return 0;
105	}
106	ntf_gl = (void *)ntf;
107	ret = ntf_gl->obj._hdr.ifi_index;
108	ynl_ntf_free(ntf);
109
110	return ret;
111}
112
113static void rt_link_del(struct ynl_sock *ys, int ifindex)
114{
115	struct rt_link_dellink_req *req;
116
117	req = rt_link_dellink_req_alloc();
118	if (!req) {
119		fprintf(stderr, "Can't alloc req\n");
120		return;
121	}
122
123	req->_hdr.ifi_index = ifindex;
124	if (rt_link_dellink(ys, req))
125		fprintf(stderr, "YNL: %s\n", ys->err.msg);
126	else
127		fprintf(stderr,
128			"Trying to delete a Netkit interface (ifindex %d)\n",
129			ifindex);
130
131	rt_link_dellink_req_free(req);
132}
133
134int main(int argc, char **argv)
135{
136	struct rt_link_getlink_req_dump *req;
137	struct rt_link_getlink_list *rsp;
138	struct ynl_error yerr;
139	struct ynl_sock *ys;
140	int created = 0;
141
142	ys = ynl_sock_create(&ynl_rt_link_family, &yerr);
143	if (!ys) {
144		fprintf(stderr, "YNL: %s\n", yerr.msg);
145		return 1;
146	}
147
148	if (argc > 1) {
149		fprintf(stderr, "Trying to create a Netkit interface\n");
150		created = rt_link_create_netkit(ys);
151		if (created < 0)
152			goto err_destroy;
153	}
154
155	req = rt_link_getlink_req_dump_alloc();
156	if (!req)
157		goto err_del_ifc;
158
159	rsp = rt_link_getlink_dump(ys, req);
160	rt_link_getlink_req_dump_free(req);
161	if (!rsp)
162		goto err_close;
163
164	if (ynl_dump_empty(rsp))
165		fprintf(stderr, "Error: no links reported\n");
166	ynl_dump_foreach(rsp, link)
167		rt_link_print(link);
168	rt_link_getlink_list_free(rsp);
169
170	if (created)
171		rt_link_del(ys, created);
172
173	ynl_sock_destroy(ys);
174	return 0;
175
176err_close:
177	fprintf(stderr, "YNL: %s\n", ys->err.msg);
178err_del_ifc:
179	if (created)
180		rt_link_del(ys, created);
181err_destroy:
182	ynl_sock_destroy(ys);
183	return 2;
184}