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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b22d8a00 TG |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013-2014 Tom Gundersen <teg@jklm.no> | |
b22d8a00 TG |
6 | ***/ |
7 | ||
8 | #include <netinet/ether.h> | |
9 | #include <linux/if.h> | |
10 | ||
b22d8a00 | 11 | #include "network-internal.h" |
23f53b99 TG |
12 | #include "networkd-address.h" |
13 | #include "networkd-manager.h" | |
14 | #include "networkd-link.h" | |
b22d8a00 TG |
15 | |
16 | static int ipv4ll_address_lost(Link *link) { | |
8e766630 LP |
17 | _cleanup_(address_freep) Address *address = NULL; |
18 | _cleanup_(route_freep) Route *route = NULL; | |
b22d8a00 TG |
19 | struct in_addr addr; |
20 | int r; | |
21 | ||
22 | assert(link); | |
23 | ||
24 | link->ipv4ll_route = false; | |
920b52e4 | 25 | link->ipv4ll_address = false; |
b22d8a00 TG |
26 | |
27 | r = sd_ipv4ll_get_address(link->ipv4ll, &addr); | |
28 | if (r < 0) | |
29 | return 0; | |
30 | ||
79008bdd | 31 | log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr)); |
b22d8a00 | 32 | |
f0213e37 | 33 | r = address_new(&address); |
b22d8a00 | 34 | if (r < 0) { |
e53fc357 | 35 | log_link_error_errno(link, r, "Could not allocate address: %m"); |
b22d8a00 TG |
36 | return r; |
37 | } | |
38 | ||
39 | address->family = AF_INET; | |
40 | address->in_addr.in = addr; | |
41 | address->prefixlen = 16; | |
42 | address->scope = RT_SCOPE_LINK; | |
43 | ||
483d099e | 44 | address_remove(address, link, link_address_remove_handler); |
b22d8a00 | 45 | |
ed9e361a | 46 | r = route_new(&route); |
b22d8a00 | 47 | if (r < 0) { |
e53fc357 | 48 | log_link_error_errno(link, r, "Could not allocate route: %m"); |
b22d8a00 TG |
49 | return r; |
50 | } | |
51 | ||
52 | route->family = AF_INET; | |
53 | route->scope = RT_SCOPE_LINK; | |
86655331 | 54 | route->priority = IPV4LL_ROUTE_METRIC; |
b22d8a00 | 55 | |
483d099e | 56 | route_remove(route, link, link_route_remove_handler); |
b22d8a00 | 57 | |
8012cd39 | 58 | link_check_ready(link); |
b22d8a00 TG |
59 | |
60 | return 0; | |
61 | } | |
62 | ||
1c4baffc | 63 | static int ipv4ll_route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { |
8e766630 | 64 | _cleanup_(link_unrefp) Link *link = userdata; |
b22d8a00 TG |
65 | int r; |
66 | ||
67 | assert(link); | |
68 | assert(!link->ipv4ll_route); | |
69 | ||
1c4baffc | 70 | r = sd_netlink_message_get_errno(m); |
b22d8a00 | 71 | if (r < 0 && r != -EEXIST) { |
e53fc357 | 72 | log_link_error_errno(link, r, "could not set ipv4ll route: %m"); |
b22d8a00 TG |
73 | link_enter_failed(link); |
74 | } | |
75 | ||
76 | link->ipv4ll_route = true; | |
77 | ||
78 | if (link->ipv4ll_address == true) | |
8012cd39 | 79 | link_check_ready(link); |
b22d8a00 TG |
80 | |
81 | return 1; | |
82 | } | |
83 | ||
1c4baffc | 84 | static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { |
8e766630 | 85 | _cleanup_(link_unrefp) Link *link = userdata; |
b22d8a00 TG |
86 | int r; |
87 | ||
88 | assert(link); | |
89 | assert(!link->ipv4ll_address); | |
90 | ||
1c4baffc | 91 | r = sd_netlink_message_get_errno(m); |
b22d8a00 | 92 | if (r < 0 && r != -EEXIST) { |
e53fc357 | 93 | log_link_error_errno(link, r, "could not set ipv4ll address: %m"); |
b22d8a00 | 94 | link_enter_failed(link); |
45af44d4 | 95 | } else if (r >= 0) |
200a0868 | 96 | manager_rtnl_process_address(rtnl, m, link->manager); |
b22d8a00 TG |
97 | |
98 | link->ipv4ll_address = true; | |
99 | ||
c1db1a80 | 100 | if (link->ipv4ll_route) |
8012cd39 | 101 | link_check_ready(link); |
b22d8a00 TG |
102 | |
103 | return 1; | |
104 | } | |
105 | ||
106 | static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) { | |
8e766630 LP |
107 | _cleanup_(address_freep) Address *ll_addr = NULL; |
108 | _cleanup_(route_freep) Route *route = NULL; | |
b22d8a00 TG |
109 | struct in_addr address; |
110 | int r; | |
111 | ||
112 | assert(ll); | |
113 | assert(link); | |
114 | ||
115 | r = sd_ipv4ll_get_address(ll, &address); | |
116 | if (r == -ENOENT) | |
117 | return 0; | |
118 | else if (r < 0) | |
119 | return r; | |
120 | ||
79008bdd | 121 | log_link_debug(link, "IPv4 link-local claim %u.%u.%u.%u", |
b22d8a00 TG |
122 | ADDRESS_FMT_VAL(address)); |
123 | ||
f0213e37 | 124 | r = address_new(&ll_addr); |
b22d8a00 TG |
125 | if (r < 0) |
126 | return r; | |
127 | ||
128 | ll_addr->family = AF_INET; | |
129 | ll_addr->in_addr.in = address; | |
130 | ll_addr->prefixlen = 16; | |
8e38570e | 131 | ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htobe32(0xfffffffflu >> ll_addr->prefixlen); |
b22d8a00 TG |
132 | ll_addr->scope = RT_SCOPE_LINK; |
133 | ||
66669078 | 134 | r = address_configure(ll_addr, link, ipv4ll_address_handler, false); |
b22d8a00 TG |
135 | if (r < 0) |
136 | return r; | |
137 | ||
138 | link->ipv4ll_address = false; | |
139 | ||
ed9e361a | 140 | r = route_new(&route); |
b22d8a00 TG |
141 | if (r < 0) |
142 | return r; | |
143 | ||
144 | route->family = AF_INET; | |
145 | route->scope = RT_SCOPE_LINK; | |
ed9e361a | 146 | route->protocol = RTPROT_STATIC; |
86655331 | 147 | route->priority = IPV4LL_ROUTE_METRIC; |
b22d8a00 TG |
148 | |
149 | r = route_configure(route, link, ipv4ll_route_handler); | |
150 | if (r < 0) | |
151 | return r; | |
152 | ||
153 | link->ipv4ll_route = false; | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
9ed794a3 | 158 | static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata) { |
b22d8a00 TG |
159 | Link *link = userdata; |
160 | int r; | |
161 | ||
162 | assert(link); | |
163 | assert(link->network); | |
b22d8a00 TG |
164 | |
165 | if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) | |
166 | return; | |
167 | ||
168 | switch(event) { | |
be19c5b5 | 169 | case SD_IPV4LL_EVENT_STOP: |
0698ff41 JR |
170 | r = ipv4ll_address_lost(link); |
171 | if (r < 0) { | |
172 | link_enter_failed(link); | |
173 | return; | |
174 | } | |
175 | break; | |
be19c5b5 | 176 | case SD_IPV4LL_EVENT_CONFLICT: |
b22d8a00 TG |
177 | r = ipv4ll_address_lost(link); |
178 | if (r < 0) { | |
179 | link_enter_failed(link); | |
180 | return; | |
181 | } | |
0698ff41 JR |
182 | |
183 | r = sd_ipv4ll_restart(ll); | |
184 | if (r < 0) | |
185 | log_link_warning(link, "Could not acquire IPv4 link-local address"); | |
b22d8a00 | 186 | break; |
be19c5b5 | 187 | case SD_IPV4LL_EVENT_BIND: |
b22d8a00 TG |
188 | r = ipv4ll_address_claimed(ll, link); |
189 | if (r < 0) { | |
190 | link_enter_failed(link); | |
191 | return; | |
192 | } | |
193 | break; | |
194 | default: | |
b45e4eb6 | 195 | log_link_warning(link, "IPv4 link-local unknown event: %d", event); |
b22d8a00 TG |
196 | break; |
197 | } | |
198 | } | |
199 | ||
200 | int ipv4ll_configure(Link *link) { | |
dbe81cbd | 201 | uint64_t seed; |
b22d8a00 TG |
202 | int r; |
203 | ||
204 | assert(link); | |
205 | assert(link->network); | |
e0ee46f2 | 206 | assert(link->network->link_local & ADDRESS_FAMILY_IPV4); |
b22d8a00 | 207 | |
0bc70f1d TG |
208 | if (!link->ipv4ll) { |
209 | r = sd_ipv4ll_new(&link->ipv4ll); | |
210 | if (r < 0) | |
211 | return r; | |
212 | } | |
b22d8a00 TG |
213 | |
214 | if (link->udev_device) { | |
dbe81cbd | 215 | r = net_get_unique_predictable_data(link->udev_device, &seed); |
b22d8a00 | 216 | if (r >= 0) { |
38958cd6 | 217 | r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed); |
b22d8a00 TG |
218 | if (r < 0) |
219 | return r; | |
220 | } | |
221 | } | |
222 | ||
223 | r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0); | |
224 | if (r < 0) | |
225 | return r; | |
226 | ||
227 | r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac); | |
228 | if (r < 0) | |
229 | return r; | |
230 | ||
2f8e7633 | 231 | r = sd_ipv4ll_set_ifindex(link->ipv4ll, link->ifindex); |
b22d8a00 TG |
232 | if (r < 0) |
233 | return r; | |
234 | ||
235 | r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link); | |
236 | if (r < 0) | |
237 | return r; | |
238 | ||
239 | return 0; | |
240 | } |