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 BETA_MAX 32
41
pie_parse_opt(struct qdisc_util * qu,int argc,char ** argv,struct nlmsghdr * n)42 static int pie_parse_opt(struct qdisc_util *qu, int argc, char **argv,
43 struct nlmsghdr *n)
44 {
45 unsigned int limit = 0;
46 unsigned int target = 0;
47 unsigned int tupdate = 0;
48 unsigned int alpha = 0;
49 unsigned int beta = 0;
50 int ecn = -1;
51 int bytemode = -1;
52 struct rtattr *tail;
53
54 while (argc > 0) {
55 if (strcmp(*argv, "limit") == 0) {
56 NEXT_ARG();
57 if (get_unsigned(&limit, *argv, 0)) {
58 fprintf(stderr, "Illegal \"limit\"\n");
59 return -1;
60 }
61 } else if (strcmp(*argv, "target") == 0) {
62 NEXT_ARG();
63 if (get_time(&target, *argv)) {
64 fprintf(stderr, "Illegal \"target\"\n");
65 return -1;
66 }
67 } else if (strcmp(*argv, "tupdate") == 0) {
68 NEXT_ARG();
69 if (get_time(&tupdate, *argv)) {
70 fprintf(stderr, "Illegal \"tupdate\"\n");
71 return -1;
72 }
73 } else if (strcmp(*argv, "alpha") == 0) {
74 NEXT_ARG();
75 if (get_unsigned(&alpha, *argv, 0) ||
76 (alpha > ALPHA_MAX)) {
77 fprintf(stderr, "Illegal \"alpha\"\n");
78 return -1;
79 }
80 } else if (strcmp(*argv, "beta") == 0) {
81 NEXT_ARG();
82 if (get_unsigned(&beta, *argv, 0) ||
83 (beta > BETA_MAX)) {
84 fprintf(stderr, "Illegal \"beta\"\n");
85 return -1;
86 }
87 } else if (strcmp(*argv, "ecn") == 0) {
88 ecn = 1;
89 } else if (strcmp(*argv, "noecn") == 0) {
90 ecn = 0;
91 } else if (strcmp(*argv, "bytemode") == 0) {
92 bytemode = 1;
93 } else if (strcmp(*argv, "nobytemode") == 0) {
94 bytemode = 0;
95 } else if (strcmp(*argv, "help") == 0) {
96 explain();
97 return -1;
98 } else {
99 fprintf(stderr, "What is \"%s\"?\n", *argv);
100 explain();
101 return -1;
102 }
103 argc--;
104 argv++;
105 }
106
107 tail = NLMSG_TAIL(n);
108 addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
109 if (limit)
110 addattr_l(n, 1024, TCA_PIE_LIMIT, &limit, sizeof(limit));
111 if (tupdate)
112 addattr_l(n, 1024, TCA_PIE_TUPDATE, &tupdate, sizeof(tupdate));
113 if (target)
114 addattr_l(n, 1024, TCA_PIE_TARGET, &target, sizeof(target));
115 if (alpha)
116 addattr_l(n, 1024, TCA_PIE_ALPHA, &alpha, sizeof(alpha));
117 if (beta)
118 addattr_l(n, 1024, TCA_PIE_BETA, &beta, sizeof(beta));
119 if (ecn != -1)
120 addattr_l(n, 1024, TCA_PIE_ECN, &ecn, sizeof(ecn));
121 if (bytemode != -1)
122 addattr_l(n, 1024, TCA_PIE_BYTEMODE, &bytemode,
123 sizeof(bytemode));
124
125 tail->rta_len = (void *)NLMSG_TAIL(n) - (void *)tail;
126 return 0;
127 }
128
pie_print_opt(struct qdisc_util * qu,FILE * f,struct rtattr * opt)129 static int pie_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
130 {
131 struct rtattr *tb[TCA_PIE_MAX + 1];
132 unsigned int limit;
133 unsigned int tupdate;
134 unsigned int target;
135 unsigned int alpha;
136 unsigned int beta;
137 unsigned int ecn;
138 unsigned int bytemode;
139
140 SPRINT_BUF(b1);
141
142 if (opt == NULL)
143 return 0;
144
145 parse_rtattr_nested(tb, TCA_PIE_MAX, opt);
146
147 if (tb[TCA_PIE_LIMIT] &&
148 RTA_PAYLOAD(tb[TCA_PIE_LIMIT]) >= sizeof(__u32)) {
149 limit = rta_getattr_u32(tb[TCA_PIE_LIMIT]);
150 fprintf(f, "limit %up ", limit);
151 }
152 if (tb[TCA_PIE_TARGET] &&
153 RTA_PAYLOAD(tb[TCA_PIE_TARGET]) >= sizeof(__u32)) {
154 target = rta_getattr_u32(tb[TCA_PIE_TARGET]);
155 fprintf(f, "target %s ", sprint_time(target, b1));
156 }
157 if (tb[TCA_PIE_TUPDATE] &&
158 RTA_PAYLOAD(tb[TCA_PIE_TUPDATE]) >= sizeof(__u32)) {
159 tupdate = rta_getattr_u32(tb[TCA_PIE_TUPDATE]);
160 fprintf(f, "tupdate %s ", sprint_time(tupdate, b1));
161 }
162 if (tb[TCA_PIE_ALPHA] &&
163 RTA_PAYLOAD(tb[TCA_PIE_ALPHA]) >= sizeof(__u32)) {
164 alpha = rta_getattr_u32(tb[TCA_PIE_ALPHA]);
165 fprintf(f, "alpha %u ", alpha);
166 }
167 if (tb[TCA_PIE_BETA] &&
168 RTA_PAYLOAD(tb[TCA_PIE_BETA]) >= sizeof(__u32)) {
169 beta = rta_getattr_u32(tb[TCA_PIE_BETA]);
170 fprintf(f, "beta %u ", beta);
171 }
172
173 if (tb[TCA_PIE_ECN] && RTA_PAYLOAD(tb[TCA_PIE_ECN]) >= sizeof(__u32)) {
174 ecn = rta_getattr_u32(tb[TCA_PIE_ECN]);
175 if (ecn)
176 fprintf(f, "ecn ");
177 }
178
179 if (tb[TCA_PIE_BYTEMODE] &&
180 RTA_PAYLOAD(tb[TCA_PIE_BYTEMODE]) >= sizeof(__u32)) {
181 bytemode = rta_getattr_u32(tb[TCA_PIE_BYTEMODE]);
182 if (bytemode)
183 fprintf(f, "bytemode ");
184 }
185
186 return 0;
187 }
188
pie_print_xstats(struct qdisc_util * qu,FILE * f,struct rtattr * xstats)189 static int pie_print_xstats(struct qdisc_util *qu, FILE *f,
190 struct rtattr *xstats)
191 {
192 struct tc_pie_xstats *st;
193
194 if (xstats == NULL)
195 return 0;
196
197 if (RTA_PAYLOAD(xstats) < sizeof(*st))
198 return -1;
199
200 st = RTA_DATA(xstats);
201 /*prob is returned as a fracion of maximum integer value */
202 fprintf(f, "prob %f delay %uus avg_dq_rate %u\n",
203 (double)st->prob / (double)0xffffffff, st->delay,
204 st->avg_dq_rate);
205 fprintf(f, "pkts_in %u overlimit %u dropped %u maxq %u ecn_mark %u\n",
206 st->packets_in, st->overlimit, st->dropped, st->maxq,
207 st->ecn_mark);
208 return 0;
209
210 }
211
212 struct qdisc_util pie_qdisc_util = {
213 .id = "pie",
214 .parse_qopt = pie_parse_opt,
215 .print_qopt = pie_print_opt,
216 .print_xstats = pie_print_xstats,
217 };
218