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      1 /*
      2  * q_fifo.c		FIFO.
      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:	Alexey Kuznetsov, <kuznet (at) ms2.inr.ac.ru>
     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: ... <[p|b]fifo | pfifo_head_drop> [ limit NUMBER ]\n");
     29 }
     30 
     31 static int fifo_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
     32 {
     33 	int ok=0;
     34 	struct tc_fifo_qopt opt;
     35 	memset(&opt, 0, sizeof(opt));
     36 
     37 	while (argc > 0) {
     38 		if (strcmp(*argv, "limit") == 0) {
     39 			NEXT_ARG();
     40 			if (get_size(&opt.limit, *argv)) {
     41 				fprintf(stderr, "%s: Illegal value for \"limit\": \"%s\"\n", qu->id, *argv);
     42 				return -1;
     43 			}
     44 			ok++;
     45 		} else if (strcmp(*argv, "help") == 0) {
     46 			explain();
     47 			return -1;
     48 		} else {
     49 			fprintf(stderr, "%s: unknown parameter \"%s\"\n", qu->id, *argv);
     50 			explain();
     51 			return -1;
     52 		}
     53 		argc--; argv++;
     54 	}
     55 
     56 	if (ok)
     57 		addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
     58 	return 0;
     59 }
     60 
     61 static int fifo_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
     62 {
     63 	struct tc_fifo_qopt *qopt;
     64 
     65 	if (opt == NULL)
     66 		return 0;
     67 
     68 	if (RTA_PAYLOAD(opt)  < sizeof(*qopt))
     69 		return -1;
     70 	qopt = RTA_DATA(opt);
     71 	if (strcmp(qu->id, "bfifo") == 0) {
     72 		SPRINT_BUF(b1);
     73 		fprintf(f, "limit %s", sprint_size(qopt->limit, b1));
     74 	} else
     75 		fprintf(f, "limit %up", qopt->limit);
     76 	return 0;
     77 }
     78 
     79 
     80 struct qdisc_util bfifo_qdisc_util = {
     81 	.id = "bfifo",
     82 	.parse_qopt = fifo_parse_opt,
     83 	.print_qopt = fifo_print_opt,
     84 };
     85 
     86 struct qdisc_util pfifo_qdisc_util = {
     87 	.id = "pfifo",
     88 	.parse_qopt = fifo_parse_opt,
     89 	.print_qopt = fifo_print_opt,
     90 };
     91 
     92 struct qdisc_util pfifo_head_drop_qdisc_util = {
     93 	.id = "pfifo_head_drop",
     94 	.parse_qopt = fifo_parse_opt,
     95 	.print_qopt = fifo_print_opt,
     96 };
     97 
     98 extern int prio_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt);
     99 struct qdisc_util pfifo_fast_qdisc_util = {
    100 	.id = "pfifo_fast",
    101 	.print_qopt = prio_print_opt,
    102 };
    103