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fb018d25 DS |
1 | /* A generic nexthop structure |
2 | * Copyright (C) 2013 Cumulus Networks, Inc. | |
3 | * | |
a399694f | 4 | * This file is part of Quagga. |
fb018d25 | 5 | * |
a399694f | 6 | * Quagga is free software; you can redistribute it and/or modify it |
fb018d25 DS |
7 | * under the terms of the GNU General Public License as published by the |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
a399694f | 11 | * Quagga is distributed in the hope that it will be useful, but |
fb018d25 DS |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
a399694f | 17 | * along with Quagga; see the file COPYING. If not, write to the Free |
fb018d25 DS |
18 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
19 | * 02111-1307, USA. | |
20 | */ | |
21 | #include <zebra.h> | |
22 | ||
23 | #include "prefix.h" | |
24 | #include "table.h" | |
25 | #include "memory.h" | |
fb018d25 DS |
26 | #include "command.h" |
27 | #include "if.h" | |
28 | #include "log.h" | |
29 | #include "sockunion.h" | |
30 | #include "linklist.h" | |
31 | #include "thread.h" | |
32 | #include "prefix.h" | |
33 | #include "nexthop.h" | |
40c7bdb0 | 34 | #include "mpls.h" |
fb018d25 | 35 | |
40c7bdb0 | 36 | DEFINE_MTYPE_STATIC(LIB, NEXTHOP, "Nexthop") |
37 | DEFINE_MTYPE_STATIC(LIB, NH_LABEL, "Nexthop label") | |
4a1ab8e4 | 38 | |
fb018d25 DS |
39 | /* check if nexthops are same, non-recursive */ |
40 | int | |
41 | nexthop_same_no_recurse (struct nexthop *next1, struct nexthop *next2) | |
42 | { | |
43 | if (next1->type != next2->type) | |
44 | return 0; | |
45 | ||
46 | switch (next1->type) | |
47 | { | |
48 | case NEXTHOP_TYPE_IPV4: | |
49 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
50 | if (! IPV4_ADDR_SAME (&next1->gate.ipv4, &next2->gate.ipv4)) | |
51 | return 0; | |
52 | if (next1->ifindex && (next1->ifindex != next2->ifindex)) | |
53 | return 0; | |
54 | break; | |
55 | case NEXTHOP_TYPE_IFINDEX: | |
fb018d25 DS |
56 | if (next1->ifindex != next2->ifindex) |
57 | return 0; | |
58 | break; | |
fb018d25 DS |
59 | case NEXTHOP_TYPE_IPV6: |
60 | if (! IPV6_ADDR_SAME (&next1->gate.ipv6, &next2->gate.ipv6)) | |
61 | return 0; | |
62 | break; | |
63 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
fb018d25 DS |
64 | if (! IPV6_ADDR_SAME (&next1->gate.ipv6, &next2->gate.ipv6)) |
65 | return 0; | |
66 | if (next1->ifindex != next2->ifindex) | |
67 | return 0; | |
68 | break; | |
fb018d25 DS |
69 | default: |
70 | /* do nothing */ | |
71 | break; | |
72 | } | |
73 | return 1; | |
74 | } | |
75 | ||
76 | /* | |
77 | * nexthop_type_to_str | |
78 | */ | |
79 | const char * | |
80 | nexthop_type_to_str (enum nexthop_types_t nh_type) | |
81 | { | |
82 | static const char *desc[] = { | |
83 | "none", | |
84 | "Directly connected", | |
fb018d25 DS |
85 | "IPv4 nexthop", |
86 | "IPv4 nexthop with ifindex", | |
fb018d25 DS |
87 | "IPv6 nexthop", |
88 | "IPv6 nexthop with ifindex", | |
fb018d25 DS |
89 | "Null0 nexthop", |
90 | }; | |
91 | ||
fb018d25 DS |
92 | return desc[nh_type]; |
93 | } | |
a399694f | 94 | |
a64448ba DS |
95 | /* |
96 | * Check if the labels match for the 2 nexthops specified. | |
97 | */ | |
98 | int | |
99 | nexthop_labels_match (struct nexthop *nh1, struct nexthop *nh2) | |
100 | { | |
101 | struct nexthop_label *nhl1, *nhl2; | |
102 | ||
103 | nhl1 = nh1->nh_label; | |
104 | nhl2 = nh2->nh_label; | |
105 | if ((nhl1 && !nhl2) || (!nhl1 && nhl2)) | |
106 | return 0; | |
107 | ||
108 | if (nhl1->num_labels != nhl2->num_labels) | |
109 | return 0; | |
110 | ||
111 | if (memcmp (nhl1->label, nhl2->label, nhl1->num_labels)) | |
112 | return 0; | |
113 | ||
114 | return 1; | |
115 | } | |
116 | ||
a399694f DS |
117 | struct nexthop * |
118 | nexthop_new (void) | |
119 | { | |
120 | return XCALLOC (MTYPE_NEXTHOP, sizeof (struct nexthop)); | |
121 | } | |
122 | ||
123 | /* Add nexthop to the end of a nexthop list. */ | |
124 | void | |
125 | nexthop_add (struct nexthop **target, struct nexthop *nexthop) | |
126 | { | |
127 | struct nexthop *last; | |
128 | ||
129 | for (last = *target; last && last->next; last = last->next) | |
130 | ; | |
131 | if (last) | |
132 | last->next = nexthop; | |
133 | else | |
134 | *target = nexthop; | |
135 | nexthop->prev = last; | |
136 | } | |
137 | ||
138 | void | |
139 | copy_nexthops (struct nexthop **tnh, struct nexthop *nh) | |
140 | { | |
141 | struct nexthop *nexthop; | |
142 | struct nexthop *nh1; | |
143 | ||
144 | for (nh1 = nh; nh1; nh1 = nh1->next) | |
145 | { | |
146 | nexthop = nexthop_new(); | |
147 | nexthop->flags = nh->flags; | |
148 | nexthop->type = nh->type; | |
149 | nexthop->ifindex = nh->ifindex; | |
a399694f DS |
150 | memcpy(&(nexthop->gate), &(nh->gate), sizeof(union g_addr)); |
151 | memcpy(&(nexthop->src), &(nh->src), sizeof(union g_addr)); | |
c0f4be83 | 152 | if (nh->nh_label) |
ce549947 RW |
153 | nexthop_add_labels (nexthop, nh->nh_label_type, |
154 | nh->nh_label->num_labels, &nh->nh_label->label[0]); | |
a399694f DS |
155 | nexthop_add(tnh, nexthop); |
156 | ||
157 | if (CHECK_FLAG(nh1->flags, NEXTHOP_FLAG_RECURSIVE)) | |
158 | copy_nexthops(&nexthop->resolved, nh1->resolved); | |
159 | } | |
160 | } | |
161 | ||
162 | /* Free nexthop. */ | |
163 | void | |
164 | nexthop_free (struct nexthop *nexthop) | |
165 | { | |
40c7bdb0 | 166 | nexthop_del_labels (nexthop); |
a399694f DS |
167 | if (nexthop->resolved) |
168 | nexthops_free(nexthop->resolved); | |
169 | XFREE (MTYPE_NEXTHOP, nexthop); | |
170 | } | |
171 | ||
172 | /* Frees a list of nexthops */ | |
173 | void | |
174 | nexthops_free (struct nexthop *nexthop) | |
175 | { | |
176 | struct nexthop *nh, *next; | |
177 | ||
178 | for (nh = nexthop; nh; nh = next) | |
179 | { | |
180 | next = nh->next; | |
181 | nexthop_free (nh); | |
182 | } | |
183 | } | |
80c2442a | 184 | |
40c7bdb0 | 185 | /* Update nexthop with label information. */ |
186 | void | |
ce549947 RW |
187 | nexthop_add_labels (struct nexthop *nexthop, enum lsp_types_t type, |
188 | u_int8_t num_labels, mpls_label_t *label) | |
40c7bdb0 | 189 | { |
190 | struct nexthop_label *nh_label; | |
191 | int i; | |
192 | ||
ce549947 | 193 | nexthop->nh_label_type = type; |
e2a4192a | 194 | nh_label = XCALLOC (MTYPE_NH_LABEL, sizeof (struct nexthop_label) + |
195 | num_labels * sizeof (mpls_label_t)); | |
40c7bdb0 | 196 | nh_label->num_labels = num_labels; |
197 | for (i = 0; i < num_labels; i++) | |
198 | nh_label->label[i] = *(label + i); | |
199 | nexthop->nh_label = nh_label; | |
200 | } | |
201 | ||
202 | /* Free label information of nexthop, if present. */ | |
203 | void | |
204 | nexthop_del_labels (struct nexthop *nexthop) | |
205 | { | |
206 | if (nexthop->nh_label) | |
ce549947 RW |
207 | { |
208 | XFREE (MTYPE_NH_LABEL, nexthop->nh_label); | |
209 | nexthop->nh_label_type = ZEBRA_LSP_NONE; | |
210 | } | |
40c7bdb0 | 211 | } |
212 | ||
80c2442a | 213 | const char * |
214 | nexthop2str (struct nexthop *nexthop, char *str, int size) | |
215 | { | |
216 | switch (nexthop->type) | |
217 | { | |
218 | case NEXTHOP_TYPE_IFINDEX: | |
219 | snprintf (str, size, "if %u", nexthop->ifindex); | |
220 | break; | |
221 | case NEXTHOP_TYPE_IPV4: | |
222 | snprintf (str, size, "%s", inet_ntoa (nexthop->gate.ipv4)); | |
223 | break; | |
224 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
225 | snprintf (str, size, "%s if %u", | |
226 | inet_ntoa (nexthop->gate.ipv4), nexthop->ifindex); | |
227 | break; | |
228 | case NEXTHOP_TYPE_IPV6: | |
229 | snprintf (str, size, "%s", inet6_ntoa (nexthop->gate.ipv6)); | |
230 | break; | |
231 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
232 | snprintf (str, size, "%s if %u", | |
233 | inet6_ntoa (nexthop->gate.ipv6), nexthop->ifindex); | |
234 | break; | |
235 | case NEXTHOP_TYPE_BLACKHOLE: | |
236 | snprintf (str, size, "blackhole"); | |
237 | break; | |
238 | default: | |
239 | snprintf (str, size, "unknown"); | |
240 | break; | |
241 | } | |
242 | ||
243 | return str; | |
244 | } |