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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b22d8a00 | 2 | /*** |
96b2fb93 | 3 | Copyright © 2013-2014 Tom Gundersen <teg@jklm.no> |
b22d8a00 TG |
4 | ***/ |
5 | ||
6 | #include <netinet/ether.h> | |
7 | #include <linux/if.h> | |
8 | ||
b22d8a00 | 9 | #include "network-internal.h" |
23f53b99 TG |
10 | #include "networkd-address.h" |
11 | #include "networkd-manager.h" | |
12 | #include "networkd-link.h" | |
b22d8a00 TG |
13 | |
14 | static int ipv4ll_address_lost(Link *link) { | |
8e766630 LP |
15 | _cleanup_(address_freep) Address *address = NULL; |
16 | _cleanup_(route_freep) Route *route = NULL; | |
b22d8a00 TG |
17 | struct in_addr addr; |
18 | int r; | |
19 | ||
20 | assert(link); | |
21 | ||
22 | link->ipv4ll_route = false; | |
920b52e4 | 23 | link->ipv4ll_address = false; |
b22d8a00 TG |
24 | |
25 | r = sd_ipv4ll_get_address(link->ipv4ll, &addr); | |
26 | if (r < 0) | |
27 | return 0; | |
28 | ||
79008bdd | 29 | log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr)); |
b22d8a00 | 30 | |
f0213e37 | 31 | r = address_new(&address); |
b22d8a00 | 32 | if (r < 0) { |
e53fc357 | 33 | log_link_error_errno(link, r, "Could not allocate address: %m"); |
b22d8a00 TG |
34 | return r; |
35 | } | |
36 | ||
37 | address->family = AF_INET; | |
38 | address->in_addr.in = addr; | |
39 | address->prefixlen = 16; | |
40 | address->scope = RT_SCOPE_LINK; | |
41 | ||
483d099e | 42 | address_remove(address, link, link_address_remove_handler); |
b22d8a00 | 43 | |
ed9e361a | 44 | r = route_new(&route); |
b22d8a00 | 45 | if (r < 0) { |
e53fc357 | 46 | log_link_error_errno(link, r, "Could not allocate route: %m"); |
b22d8a00 TG |
47 | return r; |
48 | } | |
49 | ||
50 | route->family = AF_INET; | |
51 | route->scope = RT_SCOPE_LINK; | |
86655331 | 52 | route->priority = IPV4LL_ROUTE_METRIC; |
b22d8a00 | 53 | |
483d099e | 54 | route_remove(route, link, link_route_remove_handler); |
b22d8a00 | 55 | |
8012cd39 | 56 | link_check_ready(link); |
b22d8a00 TG |
57 | |
58 | return 0; | |
59 | } | |
60 | ||
1c4baffc | 61 | static int ipv4ll_route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { |
8e766630 | 62 | _cleanup_(link_unrefp) Link *link = userdata; |
b22d8a00 TG |
63 | int r; |
64 | ||
65 | assert(link); | |
66 | assert(!link->ipv4ll_route); | |
67 | ||
1c4baffc | 68 | r = sd_netlink_message_get_errno(m); |
b22d8a00 | 69 | if (r < 0 && r != -EEXIST) { |
e53fc357 | 70 | log_link_error_errno(link, r, "could not set ipv4ll route: %m"); |
b22d8a00 TG |
71 | link_enter_failed(link); |
72 | } | |
73 | ||
74 | link->ipv4ll_route = true; | |
75 | ||
76 | if (link->ipv4ll_address == true) | |
8012cd39 | 77 | link_check_ready(link); |
b22d8a00 TG |
78 | |
79 | return 1; | |
80 | } | |
81 | ||
1c4baffc | 82 | static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { |
8e766630 | 83 | _cleanup_(link_unrefp) Link *link = userdata; |
b22d8a00 TG |
84 | int r; |
85 | ||
86 | assert(link); | |
87 | assert(!link->ipv4ll_address); | |
88 | ||
1c4baffc | 89 | r = sd_netlink_message_get_errno(m); |
b22d8a00 | 90 | if (r < 0 && r != -EEXIST) { |
e53fc357 | 91 | log_link_error_errno(link, r, "could not set ipv4ll address: %m"); |
b22d8a00 | 92 | link_enter_failed(link); |
45af44d4 | 93 | } else if (r >= 0) |
200a0868 | 94 | manager_rtnl_process_address(rtnl, m, link->manager); |
b22d8a00 TG |
95 | |
96 | link->ipv4ll_address = true; | |
97 | ||
c1db1a80 | 98 | if (link->ipv4ll_route) |
8012cd39 | 99 | link_check_ready(link); |
b22d8a00 TG |
100 | |
101 | return 1; | |
102 | } | |
103 | ||
104 | static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) { | |
8e766630 LP |
105 | _cleanup_(address_freep) Address *ll_addr = NULL; |
106 | _cleanup_(route_freep) Route *route = NULL; | |
b22d8a00 TG |
107 | struct in_addr address; |
108 | int r; | |
109 | ||
110 | assert(ll); | |
111 | assert(link); | |
112 | ||
113 | r = sd_ipv4ll_get_address(ll, &address); | |
114 | if (r == -ENOENT) | |
115 | return 0; | |
116 | else if (r < 0) | |
117 | return r; | |
118 | ||
79008bdd | 119 | log_link_debug(link, "IPv4 link-local claim %u.%u.%u.%u", |
b22d8a00 TG |
120 | ADDRESS_FMT_VAL(address)); |
121 | ||
f0213e37 | 122 | r = address_new(&ll_addr); |
b22d8a00 TG |
123 | if (r < 0) |
124 | return r; | |
125 | ||
126 | ll_addr->family = AF_INET; | |
127 | ll_addr->in_addr.in = address; | |
128 | ll_addr->prefixlen = 16; | |
8e38570e | 129 | ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htobe32(0xfffffffflu >> ll_addr->prefixlen); |
b22d8a00 TG |
130 | ll_addr->scope = RT_SCOPE_LINK; |
131 | ||
66669078 | 132 | r = address_configure(ll_addr, link, ipv4ll_address_handler, false); |
b22d8a00 TG |
133 | if (r < 0) |
134 | return r; | |
135 | ||
136 | link->ipv4ll_address = false; | |
137 | ||
ed9e361a | 138 | r = route_new(&route); |
b22d8a00 TG |
139 | if (r < 0) |
140 | return r; | |
141 | ||
142 | route->family = AF_INET; | |
143 | route->scope = RT_SCOPE_LINK; | |
ed9e361a | 144 | route->protocol = RTPROT_STATIC; |
86655331 | 145 | route->priority = IPV4LL_ROUTE_METRIC; |
b22d8a00 TG |
146 | |
147 | r = route_configure(route, link, ipv4ll_route_handler); | |
148 | if (r < 0) | |
149 | return r; | |
150 | ||
151 | link->ipv4ll_route = false; | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
9ed794a3 | 156 | static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata) { |
b22d8a00 TG |
157 | Link *link = userdata; |
158 | int r; | |
159 | ||
160 | assert(link); | |
161 | assert(link->network); | |
b22d8a00 TG |
162 | |
163 | if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) | |
164 | return; | |
165 | ||
166 | switch(event) { | |
be19c5b5 | 167 | case SD_IPV4LL_EVENT_STOP: |
0698ff41 JR |
168 | r = ipv4ll_address_lost(link); |
169 | if (r < 0) { | |
170 | link_enter_failed(link); | |
171 | return; | |
172 | } | |
173 | break; | |
be19c5b5 | 174 | case SD_IPV4LL_EVENT_CONFLICT: |
b22d8a00 TG |
175 | r = ipv4ll_address_lost(link); |
176 | if (r < 0) { | |
177 | link_enter_failed(link); | |
178 | return; | |
179 | } | |
0698ff41 JR |
180 | |
181 | r = sd_ipv4ll_restart(ll); | |
182 | if (r < 0) | |
183 | log_link_warning(link, "Could not acquire IPv4 link-local address"); | |
b22d8a00 | 184 | break; |
be19c5b5 | 185 | case SD_IPV4LL_EVENT_BIND: |
b22d8a00 TG |
186 | r = ipv4ll_address_claimed(ll, link); |
187 | if (r < 0) { | |
188 | link_enter_failed(link); | |
189 | return; | |
190 | } | |
191 | break; | |
192 | default: | |
b45e4eb6 | 193 | log_link_warning(link, "IPv4 link-local unknown event: %d", event); |
b22d8a00 TG |
194 | break; |
195 | } | |
196 | } | |
197 | ||
198 | int ipv4ll_configure(Link *link) { | |
dbe81cbd | 199 | uint64_t seed; |
b22d8a00 TG |
200 | int r; |
201 | ||
202 | assert(link); | |
203 | assert(link->network); | |
e0ee46f2 | 204 | assert(link->network->link_local & ADDRESS_FAMILY_IPV4); |
b22d8a00 | 205 | |
0bc70f1d TG |
206 | if (!link->ipv4ll) { |
207 | r = sd_ipv4ll_new(&link->ipv4ll); | |
208 | if (r < 0) | |
209 | return r; | |
210 | } | |
b22d8a00 TG |
211 | |
212 | if (link->udev_device) { | |
dbe81cbd | 213 | r = net_get_unique_predictable_data(link->udev_device, &seed); |
b22d8a00 | 214 | if (r >= 0) { |
38958cd6 | 215 | r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed); |
b22d8a00 TG |
216 | if (r < 0) |
217 | return r; | |
218 | } | |
219 | } | |
220 | ||
221 | r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0); | |
222 | if (r < 0) | |
223 | return r; | |
224 | ||
225 | r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac); | |
226 | if (r < 0) | |
227 | return r; | |
228 | ||
2f8e7633 | 229 | r = sd_ipv4ll_set_ifindex(link->ipv4ll, link->ifindex); |
b22d8a00 TG |
230 | if (r < 0) |
231 | return r; | |
232 | ||
233 | r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link); | |
234 | if (r < 0) | |
235 | return r; | |
236 | ||
237 | return 0; | |
238 | } |