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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
11bf3cce | 2 | |
b5efdb8a | 3 | #include "alloc-util.h" |
fc2f9534 | 4 | #include "networkd-address-pool.h" |
23f53b99 | 5 | #include "networkd-manager.h" |
cf1d700d | 6 | #include "set.h" |
07630cea | 7 | #include "string-util.h" |
11bf3cce | 8 | |
304e7e9d YW |
9 | #define RANDOM_PREFIX_TRIAL_MAX 1024 |
10 | ||
198afaab | 11 | static int address_pool_new( |
11bf3cce LP |
12 | Manager *m, |
13 | AddressPool **ret, | |
0dd25fb9 | 14 | int family, |
11bf3cce LP |
15 | const union in_addr_union *u, |
16 | unsigned prefixlen) { | |
17 | ||
18 | AddressPool *p; | |
19 | ||
20 | assert(m); | |
21 | assert(ret); | |
22 | assert(u); | |
23 | ||
17f9c355 | 24 | p = new(AddressPool, 1); |
11bf3cce LP |
25 | if (!p) |
26 | return -ENOMEM; | |
27 | ||
17f9c355 YW |
28 | *p = (AddressPool) { |
29 | .manager = m, | |
30 | .family = family, | |
31 | .prefixlen = prefixlen, | |
32 | .in_addr = *u, | |
33 | }; | |
11bf3cce LP |
34 | |
35 | LIST_PREPEND(address_pools, m->address_pools, p); | |
36 | ||
37 | *ret = p; | |
38 | return 0; | |
39 | } | |
40 | ||
41 | int address_pool_new_from_string( | |
42 | Manager *m, | |
43 | AddressPool **ret, | |
0dd25fb9 | 44 | int family, |
11bf3cce LP |
45 | const char *p, |
46 | unsigned prefixlen) { | |
47 | ||
48 | union in_addr_union u; | |
49 | int r; | |
50 | ||
51 | assert(m); | |
52 | assert(ret); | |
53 | assert(p); | |
54 | ||
55 | r = in_addr_from_string(family, p, &u); | |
56 | if (r < 0) | |
57 | return r; | |
58 | ||
59 | return address_pool_new(m, ret, family, &u, prefixlen); | |
60 | } | |
61 | ||
62 | void address_pool_free(AddressPool *p) { | |
63 | ||
64 | if (!p) | |
65 | return; | |
66 | ||
67 | if (p->manager) | |
68 | LIST_REMOVE(address_pools, p->manager->address_pools, p); | |
69 | ||
70 | free(p); | |
71 | } | |
72 | ||
73 | static bool address_pool_prefix_is_taken( | |
74 | AddressPool *p, | |
75 | const union in_addr_union *u, | |
76 | unsigned prefixlen) { | |
77 | ||
11bf3cce LP |
78 | Link *l; |
79 | Network *n; | |
80 | ||
81 | assert(p); | |
82 | assert(u); | |
83 | ||
90e74a66 | 84 | HASHMAP_FOREACH(l, p->manager->links) { |
11bf3cce LP |
85 | Address *a; |
86 | ||
87 | /* Don't clash with assigned addresses */ | |
90e74a66 | 88 | SET_FOREACH(a, l->addresses) { |
11bf3cce LP |
89 | if (a->family != p->family) |
90 | continue; | |
91 | ||
92 | if (in_addr_prefix_intersect(p->family, u, prefixlen, &a->in_addr, a->prefixlen)) | |
93 | return true; | |
94 | } | |
95 | ||
96 | /* Don't clash with addresses already pulled from the pool, but not assigned yet */ | |
97 | LIST_FOREACH(addresses, a, l->pool_addresses) { | |
98 | if (a->family != p->family) | |
99 | continue; | |
100 | ||
101 | if (in_addr_prefix_intersect(p->family, u, prefixlen, &a->in_addr, a->prefixlen)) | |
102 | return true; | |
103 | } | |
104 | } | |
105 | ||
106 | /* And don't clash with configured but un-assigned addresses either */ | |
90e74a66 | 107 | ORDERED_HASHMAP_FOREACH(n, p->manager->networks) { |
11bf3cce LP |
108 | Address *a; |
109 | ||
110 | LIST_FOREACH(addresses, a, n->static_addresses) { | |
111 | if (a->family != p->family) | |
112 | continue; | |
113 | ||
114 | if (in_addr_prefix_intersect(p->family, u, prefixlen, &a->in_addr, a->prefixlen)) | |
115 | return true; | |
116 | } | |
117 | } | |
118 | ||
119 | return false; | |
120 | } | |
121 | ||
122 | int address_pool_acquire(AddressPool *p, unsigned prefixlen, union in_addr_union *found) { | |
123 | union in_addr_union u; | |
304e7e9d YW |
124 | unsigned i; |
125 | int r; | |
11bf3cce LP |
126 | |
127 | assert(p); | |
128 | assert(prefixlen > 0); | |
129 | assert(found); | |
130 | ||
304e7e9d | 131 | if (p->prefixlen >= prefixlen) |
11bf3cce LP |
132 | return 0; |
133 | ||
134 | u = p->in_addr; | |
0229100b | 135 | |
304e7e9d YW |
136 | for (i = 0; i < RANDOM_PREFIX_TRIAL_MAX; i++) { |
137 | r = in_addr_random_prefix(p->family, &u, p->prefixlen, prefixlen); | |
138 | if (r <= 0) | |
139 | return r; | |
11bf3cce | 140 | |
304e7e9d YW |
141 | if (!address_pool_prefix_is_taken(p, &u, prefixlen)) { |
142 | if (DEBUG_LOGGING) { | |
143 | _cleanup_free_ char *s = NULL; | |
144 | ||
145 | (void) in_addr_to_string(p->family, &u, &s); | |
146 | log_debug("Found range %s/%u", strna(s), prefixlen); | |
147 | } | |
11bf3cce LP |
148 | |
149 | *found = u; | |
150 | return 1; | |
151 | } | |
11bf3cce LP |
152 | } |
153 | ||
154 | return 0; | |
155 | } |