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1 /*
2  * q_drr.c              DRR.
3  *
4  *              This program is free software; you can redistribute it and/or
5  *              modify it under the terms of the GNU General Public License
6  *              as published by the Free Software Foundation; either version
7  *              2 of the License, or (at your option) any later version.
8  *
9  * Authors:     Patrick McHardy <kaber@trash.net>
10  *
11  */
12
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <unistd.h>
16 #include <syslog.h>
17 #include <fcntl.h>
18 #include <sys/socket.h>
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
21 #include <string.h>
22
23 #include "utils.h"
24 #include "tc_util.h"
25
26 static void explain(void)
27 {
28         fprintf(stderr, "Usage: ... drr\n");
29 }
30
31 static void explain2(void)
32 {
33         fprintf(stderr, "Usage: ... drr quantum SIZE\n");
34 }
35
36
37 static int drr_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
38 {
39         while (argc > 0) {
40                 if (strcmp(*argv, "help") == 0) {
41                         explain();
42                         return -1;
43                 } else {
44                         fprintf(stderr, "What is \"%s\"?\n", *argv);
45                         explain();
46                         return -1;
47                 }
48                 argc--; argv++;
49         }
50         return 0;
51 }
52
53 static int drr_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
54                                struct nlmsghdr *n)
55 {
56         struct rtattr *tail;
57         __u32 tmp;
58
59         tail = NLMSG_TAIL(n);
60         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
61
62         while (argc > 0) {
63                 if (strcmp(*argv, "quantum") == 0) {
64                         NEXT_ARG();
65                         if (get_size(&tmp, *argv)) {
66                                 fprintf(stderr, "Illegal \"quantum\"\n");
67                                 return -1;
68                         }
69                         addattr_l(n, 1024, TCA_DRR_QUANTUM, &tmp, sizeof(tmp));
70                 } else if (strcmp(*argv, "help") == 0) {
71                         explain2();
72                         return -1;
73                 } else {
74                         fprintf(stderr, "What is \"%s\"?\n", *argv);
75                         explain2();
76                         return -1;
77                 }
78                 argc--; argv++;
79         }
80
81         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *)tail;
82         return 0;
83 }
84
85 static int drr_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
86 {
87         struct rtattr *tb[TCA_DRR_MAX + 1];
88         SPRINT_BUF(b1);
89
90         if (opt == NULL)
91                 return 0;
92
93         parse_rtattr_nested(tb, TCA_DRR_MAX, opt);
94
95         if (tb[TCA_DRR_QUANTUM])
96                 fprintf(f, "quantum %s ",
97                         sprint_size(*(__u32 *)RTA_DATA(tb[TCA_DRR_QUANTUM]), b1));
98         return 0;
99 }
100
101 static int drr_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
102 {
103         struct tc_drr_stats *x;
104         SPRINT_BUF(b1);
105
106         if (xstats == NULL)
107                 return 0;
108         if (RTA_PAYLOAD(xstats) < sizeof(*x))
109                 return -1;
110         x = RTA_DATA(xstats);
111
112         fprintf(f, " deficit %s ", sprint_size(x->deficit, b1));
113         return 0;
114 }
115
116 struct qdisc_util drr_qdisc_util = {
117         .id             = "drr",
118         .parse_qopt     = drr_parse_opt,
119         .print_qopt     = drr_print_opt,
120         .print_xstats   = drr_print_xstats,
121         .parse_copt     = drr_parse_class_opt,
122         .print_copt     = drr_print_opt,
123 };