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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b22d8a00 TG |
2 | |
3 | #include <netinet/ether.h> | |
4 | #include <linux/if.h> | |
5 | ||
b22d8a00 | 6 | #include "network-internal.h" |
23f53b99 TG |
7 | #include "networkd-address.h" |
8 | #include "networkd-manager.h" | |
9 | #include "networkd-link.h" | |
b22d8a00 TG |
10 | |
11 | static int ipv4ll_address_lost(Link *link) { | |
8e766630 LP |
12 | _cleanup_(address_freep) Address *address = NULL; |
13 | _cleanup_(route_freep) Route *route = NULL; | |
b22d8a00 TG |
14 | struct in_addr addr; |
15 | int r; | |
16 | ||
17 | assert(link); | |
18 | ||
19 | link->ipv4ll_route = false; | |
920b52e4 | 20 | link->ipv4ll_address = false; |
b22d8a00 TG |
21 | |
22 | r = sd_ipv4ll_get_address(link->ipv4ll, &addr); | |
23 | if (r < 0) | |
24 | return 0; | |
25 | ||
79008bdd | 26 | log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr)); |
b22d8a00 | 27 | |
f0213e37 | 28 | r = address_new(&address); |
fc95c359 YW |
29 | if (r < 0) |
30 | return log_link_error_errno(link, r, "Could not allocate address: %m"); | |
b22d8a00 TG |
31 | |
32 | address->family = AF_INET; | |
33 | address->in_addr.in = addr; | |
34 | address->prefixlen = 16; | |
35 | address->scope = RT_SCOPE_LINK; | |
36 | ||
63ae0569 | 37 | address_remove(address, link, NULL); |
b22d8a00 | 38 | |
ed9e361a | 39 | r = route_new(&route); |
fc95c359 YW |
40 | if (r < 0) |
41 | return log_link_error_errno(link, r, "Could not allocate route: %m"); | |
b22d8a00 TG |
42 | |
43 | route->family = AF_INET; | |
44 | route->scope = RT_SCOPE_LINK; | |
86655331 | 45 | route->priority = IPV4LL_ROUTE_METRIC; |
b22d8a00 | 46 | |
4645ad47 | 47 | route_remove(route, link, NULL); |
b22d8a00 | 48 | |
8012cd39 | 49 | link_check_ready(link); |
b22d8a00 TG |
50 | |
51 | return 0; | |
52 | } | |
53 | ||
302a796f | 54 | static int ipv4ll_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
b22d8a00 TG |
55 | int r; |
56 | ||
57 | assert(link); | |
58 | assert(!link->ipv4ll_route); | |
59 | ||
1c4baffc | 60 | r = sd_netlink_message_get_errno(m); |
b22d8a00 | 61 | if (r < 0 && r != -EEXIST) { |
e53fc357 | 62 | log_link_error_errno(link, r, "could not set ipv4ll route: %m"); |
b22d8a00 TG |
63 | link_enter_failed(link); |
64 | } | |
65 | ||
66 | link->ipv4ll_route = true; | |
67 | ||
79316750 | 68 | link_check_ready(link); |
b22d8a00 TG |
69 | |
70 | return 1; | |
71 | } | |
72 | ||
79316750 YW |
73 | static int ipv4ll_route_configure(Link *link) { |
74 | _cleanup_(route_freep) Route *route = NULL; | |
75 | int r; | |
76 | ||
77 | r = route_new(&route); | |
78 | if (r < 0) | |
79 | return r; | |
80 | ||
81 | route->family = AF_INET; | |
82 | route->scope = RT_SCOPE_LINK; | |
83 | route->protocol = RTPROT_STATIC; | |
84 | route->priority = IPV4LL_ROUTE_METRIC; | |
85 | route->table = link_get_vrf_table(link); | |
86 | ||
87 | return route_configure(route, link, ipv4ll_route_handler); | |
88 | } | |
89 | ||
302a796f | 90 | static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
b22d8a00 TG |
91 | int r; |
92 | ||
93 | assert(link); | |
94 | assert(!link->ipv4ll_address); | |
95 | ||
1c4baffc | 96 | r = sd_netlink_message_get_errno(m); |
b22d8a00 | 97 | if (r < 0 && r != -EEXIST) { |
e53fc357 | 98 | log_link_error_errno(link, r, "could not set ipv4ll address: %m"); |
b22d8a00 | 99 | link_enter_failed(link); |
45af44d4 | 100 | } else if (r >= 0) |
200a0868 | 101 | manager_rtnl_process_address(rtnl, m, link->manager); |
b22d8a00 TG |
102 | |
103 | link->ipv4ll_address = true; | |
104 | ||
79316750 YW |
105 | r = ipv4ll_route_configure(link); |
106 | if (r < 0) { | |
107 | log_link_error_errno(link, r, "Failed to configure ipv4ll route: %m"); | |
108 | link_enter_failed(link); | |
109 | } | |
b22d8a00 TG |
110 | |
111 | return 1; | |
112 | } | |
113 | ||
114 | static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) { | |
8e766630 | 115 | _cleanup_(address_freep) Address *ll_addr = NULL; |
b22d8a00 TG |
116 | struct in_addr address; |
117 | int r; | |
118 | ||
119 | assert(ll); | |
120 | assert(link); | |
121 | ||
79316750 YW |
122 | link->ipv4ll_address = false; |
123 | link->ipv4ll_route = false; | |
124 | ||
b22d8a00 TG |
125 | r = sd_ipv4ll_get_address(ll, &address); |
126 | if (r == -ENOENT) | |
127 | return 0; | |
128 | else if (r < 0) | |
129 | return r; | |
130 | ||
79008bdd | 131 | log_link_debug(link, "IPv4 link-local claim %u.%u.%u.%u", |
b22d8a00 TG |
132 | ADDRESS_FMT_VAL(address)); |
133 | ||
f0213e37 | 134 | r = address_new(&ll_addr); |
b22d8a00 TG |
135 | if (r < 0) |
136 | return r; | |
137 | ||
138 | ll_addr->family = AF_INET; | |
139 | ll_addr->in_addr.in = address; | |
140 | ll_addr->prefixlen = 16; | |
8e38570e | 141 | ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htobe32(0xfffffffflu >> ll_addr->prefixlen); |
b22d8a00 TG |
142 | ll_addr->scope = RT_SCOPE_LINK; |
143 | ||
66669078 | 144 | r = address_configure(ll_addr, link, ipv4ll_address_handler, false); |
b22d8a00 TG |
145 | if (r < 0) |
146 | return r; | |
147 | ||
b22d8a00 TG |
148 | return 0; |
149 | } | |
150 | ||
9ed794a3 | 151 | static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata) { |
b22d8a00 TG |
152 | Link *link = userdata; |
153 | int r; | |
154 | ||
155 | assert(link); | |
156 | assert(link->network); | |
b22d8a00 TG |
157 | |
158 | if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) | |
159 | return; | |
160 | ||
161 | switch(event) { | |
be19c5b5 | 162 | case SD_IPV4LL_EVENT_STOP: |
0698ff41 JR |
163 | r = ipv4ll_address_lost(link); |
164 | if (r < 0) { | |
165 | link_enter_failed(link); | |
166 | return; | |
167 | } | |
168 | break; | |
be19c5b5 | 169 | case SD_IPV4LL_EVENT_CONFLICT: |
b22d8a00 TG |
170 | r = ipv4ll_address_lost(link); |
171 | if (r < 0) { | |
172 | link_enter_failed(link); | |
173 | return; | |
174 | } | |
0698ff41 JR |
175 | |
176 | r = sd_ipv4ll_restart(ll); | |
177 | if (r < 0) | |
178 | log_link_warning(link, "Could not acquire IPv4 link-local address"); | |
b22d8a00 | 179 | break; |
be19c5b5 | 180 | case SD_IPV4LL_EVENT_BIND: |
b22d8a00 TG |
181 | r = ipv4ll_address_claimed(ll, link); |
182 | if (r < 0) { | |
79316750 | 183 | log_link_error(link, "Failed to configure ipv4ll address: %m"); |
b22d8a00 TG |
184 | link_enter_failed(link); |
185 | return; | |
186 | } | |
187 | break; | |
188 | default: | |
b45e4eb6 | 189 | log_link_warning(link, "IPv4 link-local unknown event: %d", event); |
b22d8a00 TG |
190 | break; |
191 | } | |
192 | } | |
193 | ||
194 | int ipv4ll_configure(Link *link) { | |
dbe81cbd | 195 | uint64_t seed; |
b22d8a00 TG |
196 | int r; |
197 | ||
198 | assert(link); | |
199 | assert(link->network); | |
e0ee46f2 | 200 | assert(link->network->link_local & ADDRESS_FAMILY_IPV4); |
b22d8a00 | 201 | |
0bc70f1d TG |
202 | if (!link->ipv4ll) { |
203 | r = sd_ipv4ll_new(&link->ipv4ll); | |
204 | if (r < 0) | |
205 | return r; | |
206 | } | |
b22d8a00 | 207 | |
51517f9e YW |
208 | if (link->sd_device && |
209 | net_get_unique_predictable_data(link->sd_device, &seed) >= 0) { | |
210 | r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed); | |
211 | if (r < 0) | |
212 | return r; | |
b22d8a00 TG |
213 | } |
214 | ||
215 | r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0); | |
216 | if (r < 0) | |
217 | return r; | |
218 | ||
219 | r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac); | |
220 | if (r < 0) | |
221 | return r; | |
222 | ||
2f8e7633 | 223 | r = sd_ipv4ll_set_ifindex(link->ipv4ll, link->ifindex); |
b22d8a00 TG |
224 | if (r < 0) |
225 | return r; | |
226 | ||
227 | r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link); | |
228 | if (r < 0) | |
229 | return r; | |
230 | ||
231 | return 0; | |
232 | } |