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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b22d8a00 | 2 | |
9aa5d8ba | 3 | #include <netinet/in.h> |
b22d8a00 TG |
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 | ||
807341ec YW |
37 | r = address_remove(address, link, NULL); |
38 | if (r < 0) | |
39 | return r; | |
b22d8a00 | 40 | |
ed9e361a | 41 | r = route_new(&route); |
fc95c359 YW |
42 | if (r < 0) |
43 | return log_link_error_errno(link, r, "Could not allocate route: %m"); | |
b22d8a00 TG |
44 | |
45 | route->family = AF_INET; | |
46 | route->scope = RT_SCOPE_LINK; | |
86655331 | 47 | route->priority = IPV4LL_ROUTE_METRIC; |
b22d8a00 | 48 | |
807341ec YW |
49 | r = route_remove(route, link, NULL); |
50 | if (r < 0) | |
51 | return r; | |
b22d8a00 | 52 | |
8012cd39 | 53 | link_check_ready(link); |
b22d8a00 TG |
54 | |
55 | return 0; | |
56 | } | |
57 | ||
302a796f | 58 | static int ipv4ll_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
b22d8a00 TG |
59 | int r; |
60 | ||
61 | assert(link); | |
62 | assert(!link->ipv4ll_route); | |
63 | ||
1c4baffc | 64 | r = sd_netlink_message_get_errno(m); |
b22d8a00 | 65 | if (r < 0 && r != -EEXIST) { |
e53fc357 | 66 | log_link_error_errno(link, r, "could not set ipv4ll route: %m"); |
b22d8a00 TG |
67 | link_enter_failed(link); |
68 | } | |
69 | ||
70 | link->ipv4ll_route = true; | |
71 | ||
79316750 | 72 | link_check_ready(link); |
b22d8a00 TG |
73 | |
74 | return 1; | |
75 | } | |
76 | ||
79316750 YW |
77 | static int ipv4ll_route_configure(Link *link) { |
78 | _cleanup_(route_freep) Route *route = NULL; | |
79 | int r; | |
80 | ||
81 | r = route_new(&route); | |
82 | if (r < 0) | |
83 | return r; | |
84 | ||
85 | route->family = AF_INET; | |
86 | route->scope = RT_SCOPE_LINK; | |
87 | route->protocol = RTPROT_STATIC; | |
88 | route->priority = IPV4LL_ROUTE_METRIC; | |
89 | route->table = link_get_vrf_table(link); | |
90 | ||
91 | return route_configure(route, link, ipv4ll_route_handler); | |
92 | } | |
93 | ||
302a796f | 94 | static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { |
b22d8a00 TG |
95 | int r; |
96 | ||
97 | assert(link); | |
98 | assert(!link->ipv4ll_address); | |
99 | ||
1c4baffc | 100 | r = sd_netlink_message_get_errno(m); |
b22d8a00 | 101 | if (r < 0 && r != -EEXIST) { |
e53fc357 | 102 | log_link_error_errno(link, r, "could not set ipv4ll address: %m"); |
b22d8a00 | 103 | link_enter_failed(link); |
45af44d4 | 104 | } else if (r >= 0) |
200a0868 | 105 | manager_rtnl_process_address(rtnl, m, link->manager); |
b22d8a00 TG |
106 | |
107 | link->ipv4ll_address = true; | |
108 | ||
79316750 YW |
109 | r = ipv4ll_route_configure(link); |
110 | if (r < 0) { | |
111 | log_link_error_errno(link, r, "Failed to configure ipv4ll route: %m"); | |
112 | link_enter_failed(link); | |
113 | } | |
b22d8a00 TG |
114 | |
115 | return 1; | |
116 | } | |
117 | ||
118 | static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) { | |
8e766630 | 119 | _cleanup_(address_freep) Address *ll_addr = NULL; |
b22d8a00 TG |
120 | struct in_addr address; |
121 | int r; | |
122 | ||
123 | assert(ll); | |
124 | assert(link); | |
125 | ||
79316750 YW |
126 | link->ipv4ll_address = false; |
127 | link->ipv4ll_route = false; | |
128 | ||
b22d8a00 TG |
129 | r = sd_ipv4ll_get_address(ll, &address); |
130 | if (r == -ENOENT) | |
131 | return 0; | |
132 | else if (r < 0) | |
133 | return r; | |
134 | ||
79008bdd | 135 | log_link_debug(link, "IPv4 link-local claim %u.%u.%u.%u", |
b22d8a00 TG |
136 | ADDRESS_FMT_VAL(address)); |
137 | ||
f0213e37 | 138 | r = address_new(&ll_addr); |
b22d8a00 TG |
139 | if (r < 0) |
140 | return r; | |
141 | ||
142 | ll_addr->family = AF_INET; | |
143 | ll_addr->in_addr.in = address; | |
144 | ll_addr->prefixlen = 16; | |
8e38570e | 145 | ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htobe32(0xfffffffflu >> ll_addr->prefixlen); |
b22d8a00 TG |
146 | ll_addr->scope = RT_SCOPE_LINK; |
147 | ||
66669078 | 148 | r = address_configure(ll_addr, link, ipv4ll_address_handler, false); |
b22d8a00 TG |
149 | if (r < 0) |
150 | return r; | |
151 | ||
b22d8a00 TG |
152 | return 0; |
153 | } | |
154 | ||
9ed794a3 | 155 | static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata) { |
b22d8a00 TG |
156 | Link *link = userdata; |
157 | int r; | |
158 | ||
159 | assert(link); | |
160 | assert(link->network); | |
b22d8a00 TG |
161 | |
162 | if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) | |
163 | return; | |
164 | ||
165 | switch(event) { | |
be19c5b5 | 166 | case SD_IPV4LL_EVENT_STOP: |
0698ff41 JR |
167 | r = ipv4ll_address_lost(link); |
168 | if (r < 0) { | |
169 | link_enter_failed(link); | |
170 | return; | |
171 | } | |
172 | break; | |
be19c5b5 | 173 | case SD_IPV4LL_EVENT_CONFLICT: |
b22d8a00 TG |
174 | r = ipv4ll_address_lost(link); |
175 | if (r < 0) { | |
176 | link_enter_failed(link); | |
177 | return; | |
178 | } | |
0698ff41 JR |
179 | |
180 | r = sd_ipv4ll_restart(ll); | |
181 | if (r < 0) | |
aa5f4c77 | 182 | log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m"); |
b22d8a00 | 183 | break; |
be19c5b5 | 184 | case SD_IPV4LL_EVENT_BIND: |
b22d8a00 TG |
185 | r = ipv4ll_address_claimed(ll, link); |
186 | if (r < 0) { | |
79316750 | 187 | log_link_error(link, "Failed to configure ipv4ll address: %m"); |
b22d8a00 TG |
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); | |
8bc17bb3 | 204 | assert(link->network->link_local & (ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_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 | 211 | |
51517f9e YW |
212 | if (link->sd_device && |
213 | net_get_unique_predictable_data(link->sd_device, &seed) >= 0) { | |
214 | r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed); | |
215 | if (r < 0) | |
216 | return r; | |
b22d8a00 TG |
217 | } |
218 | ||
219 | r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0); | |
220 | if (r < 0) | |
221 | return r; | |
222 | ||
223 | r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac); | |
224 | if (r < 0) | |
225 | return r; | |
226 | ||
2f8e7633 | 227 | r = sd_ipv4ll_set_ifindex(link->ipv4ll, link->ifindex); |
b22d8a00 TG |
228 | if (r < 0) |
229 | return r; | |
230 | ||
231 | r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link); | |
232 | if (r < 0) | |
233 | return r; | |
234 | ||
235 | return 0; | |
236 | } |