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3b6a2571 EJ |
1 | /* |
2 | * Copyright (c) 2011 Nicira Networks. | |
3 | * | |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #include <config.h> | |
18 | ||
19 | #include "autopath.h" | |
20 | ||
21 | #include <inttypes.h> | |
22 | #include <stdlib.h> | |
23 | ||
24 | #include "flow.h" | |
25 | #include "nx-match.h" | |
90bf1e07 | 26 | #include "ofp-errors.h" |
3b6a2571 EJ |
27 | #include "ofp-util.h" |
28 | #include "openflow/nicira-ext.h" | |
29 | #include "vlog.h" | |
30 | ||
31 | VLOG_DEFINE_THIS_MODULE(autopath); | |
32 | ||
3b6a2571 EJ |
33 | /* Loads 'ofp_port' into the appropriate register in accordance with the |
34 | * autopath action. */ | |
35 | void | |
36 | autopath_execute(const struct nx_action_autopath *ap, struct flow *flow, | |
37 | uint16_t ofp_port) | |
38 | { | |
43edca57 | 39 | nxm_reg_load(ap->dst, ap->ofs_nbits, ofp_port, flow); |
3b6a2571 EJ |
40 | } |
41 | ||
42 | void | |
43 | autopath_parse(struct nx_action_autopath *ap, const char *s_) | |
44 | { | |
45 | char *s; | |
46 | uint32_t reg; | |
47 | int id_int, ofs, n_bits; | |
48 | char *id_str, *dst, *save_ptr; | |
49 | ||
50 | s = xstrdup(s_); | |
51 | save_ptr = NULL; | |
52 | id_str = strtok_r(s, ", ", &save_ptr); | |
53 | dst = strtok_r(NULL, ", ", &save_ptr); | |
54 | ||
55 | if (!dst) { | |
56 | ovs_fatal(0, "%s: not enough arguments to autopath action", s_); | |
57 | } | |
58 | ||
59 | id_int = atoi(id_str); | |
60 | if (id_int < 1 || id_int > UINT32_MAX) { | |
61 | ovs_fatal(0, "%s: autopath id %d is not in valid range " | |
62 | "1 to %"PRIu32, s_, id_int, UINT32_MAX); | |
63 | } | |
64 | ||
65 | nxm_parse_field_bits(dst, ®, &ofs, &n_bits); | |
3b6a2571 EJ |
66 | if (n_bits < 16) { |
67 | ovs_fatal(0, "%s: %d-bit destination field has %u possible values, " | |
68 | "less than required 65536", s_, n_bits, 1u << n_bits); | |
69 | } | |
70 | ||
93996add | 71 | ofputil_init_NXAST_AUTOPATH(ap); |
3b6a2571 EJ |
72 | ap->id = htonl(id_int); |
73 | ap->ofs_nbits = nxm_encode_ofs_nbits(ofs, n_bits); | |
74 | ap->dst = htonl(reg); | |
75 | ||
76 | free(s); | |
77 | } | |
78 | ||
90bf1e07 | 79 | enum ofperr |
43edca57 | 80 | autopath_check(const struct nx_action_autopath *ap, const struct flow *flow) |
3b6a2571 | 81 | { |
ce523f65 EJ |
82 | int n_bits = nxm_decode_n_bits(ap->ofs_nbits); |
83 | int ofs = nxm_decode_ofs(ap->ofs_nbits); | |
84 | ||
85 | if (n_bits < 16) { | |
86 | VLOG_WARN("at least 16 bit destination is required for autopath " | |
87 | "action."); | |
90bf1e07 | 88 | return OFPERR_OFPBAC_BAD_ARGUMENT; |
ce523f65 EJ |
89 | } |
90 | ||
91 | return nxm_dst_check(ap->dst, ofs, n_bits, flow); | |
3b6a2571 | 92 | } |