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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 #define usage() return(-1)
37
38 static int drr_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
39 {
40         while (argc > 0) {
41                 if (strcmp(*argv, "help") == 0) {
42                         explain();
43                         return -1;
44                 } else {
45                         fprintf(stderr, "What is \"%s\"?\n", *argv);
46                         explain();
47                         return -1;
48                 }
49                 argc--; argv++;
50         }
51         return 0;
52 }
53
54 static int drr_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
55                                struct nlmsghdr *n)
56 {
57         struct rtattr *tail;
58         __u32 tmp;
59
60         tail = NLMSG_TAIL(n);
61         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
62
63         while (argc > 0) {
64                 if (strcmp(*argv, "quantum") == 0) {
65                         NEXT_ARG();
66                         if (get_size(&tmp, *argv)) {
67                                 fprintf(stderr, "Illegal \"quantum\"\n");
68                                 return -1;
69                         }
70                         addattr_l(n, 1024, TCA_DRR_QUANTUM, &tmp, sizeof(tmp));
71                 } else if (strcmp(*argv, "help") == 0) {
72                         explain2();
73                         return -1;
74                 } else {
75                         fprintf(stderr, "What is \"%s\"?\n", *argv);
76                         explain2();
77                         return -1;
78                 }
79                 argc--; argv++;
80         }
81
82         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *)tail;
83         return 0;
84 }
85
86 static int drr_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
87 {
88         struct rtattr *tb[TCA_DRR_MAX + 1];
89         SPRINT_BUF(b1);
90
91         if (opt == NULL)
92                 return 0;
93
94         parse_rtattr_nested(tb, TCA_DRR_MAX, opt);
95
96         if (tb[TCA_DRR_QUANTUM])
97                 fprintf(f, "quantum %s ",
98                         sprint_size(*(__u32 *)RTA_DATA(tb[TCA_DRR_QUANTUM]), b1));
99         return 0;
100 }
101
102 static int drr_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
103 {
104         struct tc_drr_stats *x;
105         SPRINT_BUF(b1);
106
107         if (xstats == NULL)
108                 return 0;
109         if (RTA_PAYLOAD(xstats) < sizeof(*x))
110                 return -1;
111         x = RTA_DATA(xstats);
112
113         fprintf(f, " deficit %s ", sprint_size(x->deficit, b1));
114         return 0;
115 }
116
117 struct qdisc_util drr_qdisc_util = {
118         .id             = "drr",
119         .parse_qopt     = drr_parse_opt,
120         .print_qopt     = drr_print_opt,
121         .print_xstats   = drr_print_xstats,
122         .parse_copt     = drr_parse_class_opt,
123         .print_copt     = drr_print_opt,
124 };