1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 Copyright 2008-2011 Lennart Poettering
4 Copyright 2014 Tom Gundersen
7 #include "sd-netlink.h"
9 #include "alloc-util.h"
10 #include "local-addresses.h"
12 #include "netlink-util.h"
14 static int address_compare(const void *_a
, const void *_b
) {
15 const struct local_address
*a
= _a
, *b
= _b
;
17 /* Order lowest scope first, IPv4 before IPv6, lowest interface index first */
19 if (a
->family
== AF_INET
&& b
->family
== AF_INET6
)
21 if (a
->family
== AF_INET6
&& b
->family
== AF_INET
)
24 if (a
->scope
< b
->scope
)
26 if (a
->scope
> b
->scope
)
29 if (a
->metric
< b
->metric
)
31 if (a
->metric
> b
->metric
)
34 if (a
->ifindex
< b
->ifindex
)
36 if (a
->ifindex
> b
->ifindex
)
39 return memcmp(&a
->address
, &b
->address
, FAMILY_ADDRESS_SIZE(a
->family
));
42 int local_addresses(sd_netlink
*context
, int ifindex
, int af
, struct local_address
**ret
) {
43 _cleanup_(sd_netlink_message_unrefp
) sd_netlink_message
*req
= NULL
, *reply
= NULL
;
44 _cleanup_(sd_netlink_unrefp
) sd_netlink
*rtnl
= NULL
;
45 _cleanup_free_
struct local_address
*list
= NULL
;
46 size_t n_list
= 0, n_allocated
= 0;
47 sd_netlink_message
*m
;
53 rtnl
= sd_netlink_ref(context
);
55 r
= sd_netlink_open(&rtnl
);
60 r
= sd_rtnl_message_new_addr(rtnl
, &req
, RTM_GETADDR
, 0, af
);
64 r
= sd_netlink_call(rtnl
, req
, 0, &reply
);
68 for (m
= reply
; m
; m
= sd_netlink_message_next(m
)) {
69 struct local_address
*a
;
74 r
= sd_netlink_message_get_errno(m
);
78 r
= sd_netlink_message_get_type(m
, &type
);
81 if (type
!= RTM_NEWADDR
)
84 r
= sd_rtnl_message_addr_get_ifindex(m
, &ifi
);
87 if (ifindex
> 0 && ifi
!= ifindex
)
90 r
= sd_rtnl_message_addr_get_family(m
, &family
);
93 if (af
!= AF_UNSPEC
&& af
!= family
)
96 r
= sd_rtnl_message_addr_get_flags(m
, &flags
);
99 if (flags
& IFA_F_DEPRECATED
)
102 if (!GREEDY_REALLOC0(list
, n_allocated
, n_list
+1))
107 r
= sd_rtnl_message_addr_get_scope(m
, &a
->scope
);
111 if (ifindex
== 0 && IN_SET(a
->scope
, RT_SCOPE_HOST
, RT_SCOPE_NOWHERE
))
117 r
= sd_netlink_message_read_in_addr(m
, IFA_LOCAL
, &a
->address
.in
);
119 r
= sd_netlink_message_read_in_addr(m
, IFA_ADDRESS
, &a
->address
.in
);
126 r
= sd_netlink_message_read_in6_addr(m
, IFA_LOCAL
, &a
->address
.in6
);
128 r
= sd_netlink_message_read_in6_addr(m
, IFA_ADDRESS
, &a
->address
.in6
);
144 qsort_safe(list
, n_list
, sizeof(struct local_address
), address_compare
);
146 *ret
= TAKE_PTR(list
);
151 int local_gateways(sd_netlink
*context
, int ifindex
, int af
, struct local_address
**ret
) {
152 _cleanup_(sd_netlink_message_unrefp
) sd_netlink_message
*req
= NULL
, *reply
= NULL
;
153 _cleanup_(sd_netlink_unrefp
) sd_netlink
*rtnl
= NULL
;
154 _cleanup_free_
struct local_address
*list
= NULL
;
155 sd_netlink_message
*m
= NULL
;
156 size_t n_list
= 0, n_allocated
= 0;
162 rtnl
= sd_netlink_ref(context
);
164 r
= sd_netlink_open(&rtnl
);
169 r
= sd_rtnl_message_new_route(rtnl
, &req
, RTM_GETROUTE
, af
, RTPROT_UNSPEC
);
173 r
= sd_netlink_message_request_dump(req
, true);
177 r
= sd_netlink_call(rtnl
, req
, 0, &reply
);
181 for (m
= reply
; m
; m
= sd_netlink_message_next(m
)) {
182 struct local_address
*a
;
184 unsigned char dst_len
, src_len
;
188 r
= sd_netlink_message_get_errno(m
);
192 r
= sd_netlink_message_get_type(m
, &type
);
195 if (type
!= RTM_NEWROUTE
)
198 /* We only care for default routes */
199 r
= sd_rtnl_message_route_get_dst_prefixlen(m
, &dst_len
);
205 r
= sd_rtnl_message_route_get_src_prefixlen(m
, &src_len
);
211 r
= sd_netlink_message_read_u32(m
, RTA_OIF
, &ifi
);
212 if (r
== -ENODATA
) /* Not all routes have an RTA_OIF attribute (for example nexthop ones) */
216 if (ifindex
> 0 && (int) ifi
!= ifindex
)
219 r
= sd_rtnl_message_route_get_family(m
, &family
);
222 if (af
!= AF_UNSPEC
&& af
!= family
)
225 if (!GREEDY_REALLOC0(list
, n_allocated
, n_list
+ 1))
232 r
= sd_netlink_message_read_in_addr(m
, RTA_GATEWAY
, &a
->address
.in
);
238 r
= sd_netlink_message_read_in6_addr(m
, RTA_GATEWAY
, &a
->address
.in6
);
247 sd_netlink_message_read_u32(m
, RTA_PRIORITY
, &a
->metric
);
256 qsort(list
, n_list
, sizeof(struct local_address
), address_compare
);
258 *ret
= TAKE_PTR(list
);