1 /* Copyright (C) 2013 Cisco Systems, Inc, 2013.
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU General Public License
5 * as published by the Free Software Foundation; either version 2
6 * of the License.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * Author: Vijay Subramanian <vijaynsu@cisco.com>
14 * Author: Mythili Prabhu <mysuryan@cisco.com>
15 *
16 */
17
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <unistd.h>
21 #include <syslog.h>
22 #include <fcntl.h>
23 #include <sys/socket.h>
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
26 #include <string.h>
27 #include <math.h>
28
29 #include "utils.h"
30 #include "tc_util.h"
31
explain(void)32 static void explain(void)
33 {
34 fprintf(stderr, "Usage: ... pie [ limit PACKETS ][ target TIME us]\n");
35 fprintf(stderr, " [ tupdate TIME us][ alpha ALPHA ]");
36 fprintf(stderr, "[beta BETA ][bytemode | nobytemode][ecn | noecn ]\n");
37 }
38
39 #define ALPHA_MAX 32
40 #define ALPHA_MIN 0
41 #define BETA_MAX 32
42 #define BETA_MIN 0
43
pie_parse_opt(struct qdisc_util * qu,int argc,char ** argv,struct nlmsghdr * n)44 static int pie_parse_opt(struct qdisc_util *qu, int argc, char **argv,
45 struct nlmsghdr *n)
46 {
47 unsigned int limit = 0;
48 unsigned int target = 0;
49 unsigned int tupdate = 0;
50 unsigned int alpha = 0;
51 unsigned int beta = 0;
52 int ecn = -1;
53 int bytemode = -1;
54 struct rtattr *tail;
55
56 while (argc > 0) {
57 if (strcmp(*argv, "limit") == 0) {
58 NEXT_ARG();
59 if (get_unsigned(&limit, *argv, 0)) {
60 fprintf(stderr, "Illegal \"limit\"\n");
61 return -1;
62 }
63 } else if (strcmp(*argv, "target") == 0) {
64 NEXT_ARG();
65 if (get_time(&target, *argv)) {
66 fprintf(stderr, "Illegal \"target\"\n");
67 return -1;
68 }
69 } else if (strcmp(*argv, "tupdate") == 0) {
70 NEXT_ARG();
71 if (get_time(&tupdate, *argv)) {
72 fprintf(stderr, "Illegal \"tupdate\"\n");
73 return -1;
74 }
75 } else if (strcmp(*argv, "alpha") == 0) {
76 NEXT_ARG();
77 if (get_unsigned(&alpha, *argv, 0) ||
78 (alpha > ALPHA_MAX) || (alpha < ALPHA_MIN)) {
79 fprintf(stderr, "Illegal \"alpha\"\n");
80 return -1;
81 }
82 } else if (strcmp(*argv, "beta") == 0) {
83 NEXT_ARG();
84 if (get_unsigned(&beta, *argv, 0) ||
85 (beta > BETA_MAX) || (beta < BETA_MIN)) {
86 fprintf(stderr, "Illegal \"beta\"\n");
87 return -1;
88 }
89 } else if (strcmp(*argv, "ecn") == 0) {
90 ecn = 1;
91 } else if (strcmp(*argv, "noecn") == 0) {
92 ecn = 0;
93 } else if (strcmp(*argv, "bytemode") == 0) {
94 bytemode = 1;
95 } else if (strcmp(*argv, "nobytemode") == 0) {
96 bytemode = 0;
97 } else if (strcmp(*argv, "help") == 0) {
98 explain();
99 return -1;
100 } else {
101 fprintf(stderr, "What is \"%s\"?\n", *argv);
102 explain();
103 return -1;
104 }
105 argc--;
106 argv++;
107 }
108
109 tail = NLMSG_TAIL(n);
110 addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
111 if (limit)
112 addattr_l(n, 1024, TCA_PIE_LIMIT, &limit, sizeof(limit));
113 if (tupdate)
114 addattr_l(n, 1024, TCA_PIE_TUPDATE, &tupdate, sizeof(tupdate));
115 if (target)
116 addattr_l(n, 1024, TCA_PIE_TARGET, &target, sizeof(target));
117 if (alpha)
118 addattr_l(n, 1024, TCA_PIE_ALPHA, &alpha, sizeof(alpha));
119 if (beta)
120 addattr_l(n, 1024, TCA_PIE_BETA, &beta, sizeof(beta));
121 if (ecn != -1)
122 addattr_l(n, 1024, TCA_PIE_ECN, &ecn, sizeof(ecn));
123 if (bytemode != -1)
124 addattr_l(n, 1024, TCA_PIE_BYTEMODE, &bytemode,
125 sizeof(bytemode));
126
127 tail->rta_len = (void *)NLMSG_TAIL(n) - (void *)tail;
128 return 0;
129 }
130
pie_print_opt(struct qdisc_util * qu,FILE * f,struct rtattr * opt)131 static int pie_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
132 {
133 struct rtattr *tb[TCA_PIE_MAX + 1];
134 unsigned int limit;
135 unsigned int tupdate;
136 unsigned int target;
137 unsigned int alpha;
138 unsigned int beta;
139 unsigned ecn;
140 unsigned bytemode;
141 SPRINT_BUF(b1);
142
143 if (opt == NULL)
144 return 0;
145
146 parse_rtattr_nested(tb, TCA_PIE_MAX, opt);
147
148 if (tb[TCA_PIE_LIMIT] &&
149 RTA_PAYLOAD(tb[TCA_PIE_LIMIT]) >= sizeof(__u32)) {
150 limit = rta_getattr_u32(tb[TCA_PIE_LIMIT]);
151 fprintf(f, "limit %up ", limit);
152 }
153 if (tb[TCA_PIE_TARGET] &&
154 RTA_PAYLOAD(tb[TCA_PIE_TARGET]) >= sizeof(__u32)) {
155 target = rta_getattr_u32(tb[TCA_PIE_TARGET]);
156 fprintf(f, "target %s ", sprint_time(target, b1));
157 }
158 if (tb[TCA_PIE_TUPDATE] &&
159 RTA_PAYLOAD(tb[TCA_PIE_TUPDATE]) >= sizeof(__u32)) {
160 tupdate = rta_getattr_u32(tb[TCA_PIE_TUPDATE]);
161 fprintf(f, "tupdate %s ", sprint_time(tupdate, b1));
162 }
163 if (tb[TCA_PIE_ALPHA] &&
164 RTA_PAYLOAD(tb[TCA_PIE_ALPHA]) >= sizeof(__u32)) {
165 alpha = rta_getattr_u32(tb[TCA_PIE_ALPHA]);
166 fprintf(f, "alpha %u ", alpha);
167 }
168 if (tb[TCA_PIE_BETA] &&
169 RTA_PAYLOAD(tb[TCA_PIE_BETA]) >= sizeof(__u32)) {
170 beta = rta_getattr_u32(tb[TCA_PIE_BETA]);
171 fprintf(f, "beta %u ", beta);
172 }
173
174 if (tb[TCA_PIE_ECN] && RTA_PAYLOAD(tb[TCA_PIE_ECN]) >= sizeof(__u32)) {
175 ecn = rta_getattr_u32(tb[TCA_PIE_ECN]);
176 if (ecn)
177 fprintf(f, "ecn ");
178 }
179
180 if (tb[TCA_PIE_BYTEMODE] &&
181 RTA_PAYLOAD(tb[TCA_PIE_BYTEMODE]) >= sizeof(__u32)) {
182 bytemode = rta_getattr_u32(tb[TCA_PIE_BYTEMODE]);
183 if (bytemode)
184 fprintf(f, "bytemode ");
185 }
186
187 return 0;
188 }
189
pie_print_xstats(struct qdisc_util * qu,FILE * f,struct rtattr * xstats)190 static int pie_print_xstats(struct qdisc_util *qu, FILE *f,
191 struct rtattr *xstats)
192 {
193 struct tc_pie_xstats *st;
194
195 if (xstats == NULL)
196 return 0;
197
198 if (RTA_PAYLOAD(xstats) < sizeof(*st))
199 return -1;
200
201 st = RTA_DATA(xstats);
202 /*prob is returned as a fracion of maximum integer value */
203 fprintf(f, "prob %f delay %uus avg_dq_rate %u\n",
204 (double)st->prob / (double)0xffffffff, st->delay,
205 st->avg_dq_rate);
206 fprintf(f, "pkts_in %u overlimit %u dropped %u maxq %u ecn_mark %u\n",
207 st->packets_in, st->overlimit, st->dropped, st->maxq,
208 st->ecn_mark);
209 return 0;
210
211 }
212
213 struct qdisc_util pie_qdisc_util = {
214 .id = "pie",
215 .parse_qopt = pie_parse_opt,
216 .print_qopt = pie_print_opt,
217 .print_xstats = pie_print_xstats,
218 };
219