ubuntu-users Digest, Vol 56, Issue 170

[Jose Rodriguez]

------------------------------

>
> Message: 3
> Date: Thu, 16 Apr 2009 01:29:33 -0400
> From: Matthew Flaschen <matthew.flaschen at gatech.edu>
> Subject: Re: PC freeze while executing Iproute2
> To: "Ubuntu user technical support,     not for general discussions"
>        <ubuntu-users at lists.ubuntu.com>
> Message-ID: <49E6C23D.6060806 at gatech.edu>
> Content-Type: text/plain; charset=UTF-8
>
> Jose Rodriguez wrote:
> > I compiled it and everything was fine but when i use the commands in a
> shell
> > to activate the algorithm it seems like iproute2 accepts the commands and
> > parameters i give but then the computer freeze. I cant do anything in it.
> > The only thing that works is the led or light of the "caps lock" button.
> So
> > i have to turn it off and turn it on again. I suspect it's a bad use or
> > memory or something like that. Im asking for some guidance here!!!!!
> Where
> > should i start looking for the problem?? What type of commmand might i
> have
> > used incorrectly??
>
> This (debugging private non-standard additions to the kernel) is way
> outside the scope of this list.  Also, I don't know how you expect
> anyone to seriously help you without the source of your module/patch.
>
> Matt Flaschen
> ------------------------------
>

I know this kind of things is not what is this list is made of, but you
never know who can help you man. Maybe one of the readers is a genius or an
expert in linux kernel but also knows a lot about Ubuntu, hehe! But you
helped me somehow, i think i know where to start looking for some answer.
Thnxs!

And for the curious eyes here is the source of what i did and it's giving me
headaches:
(Remeber: this code is made for working in iproute2)

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>

#include "utils.h"
#include "tc_util.h"

static void explain(void)
{
    fprintf(stderr, "Usage: ... pi qmax PKTS qref PKTS a VALUE b VALUE\n");
}

#define usage() return(-1)

static int pi_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct
nlmsghdr *n)
{
    int ok=0;
    struct tc_pi_qopt opt;
    int ecn_ok = 0;
    __u8 sbuf[256];
    struct rtattr *tail;

    memset(&opt, 0, sizeof(opt));

    while (argc > 0) {
        if (strcmp(*argv, "qmax") == 0) {
            NEXT_ARG();
            if (get_size(&opt.qmax, *argv)) {
                fprintf(stderr, "Illegal \"qmax\"\n");
                return -1;
            }
            ok++;
        } else if (strcmp(*argv, "qref") == 0) {
            NEXT_ARG();
            if (get_size(&opt.qref, *argv)) {
                fprintf(stderr, "Illegal \"qref\"\n");
                return -1;
            }
            ok++;
        } else if (strcmp(*argv, "a") == 0) {
            NEXT_ARG();
            if (get_size(&opt.a, *argv)) {
                fprintf(stderr, "Illegal \"a\"\n");
                return -1;
            }
            ok++;
        } else if (strcmp(*argv, "b") == 0) {
            NEXT_ARG();
            if (get_size(&opt.b, *argv)) {
                fprintf(stderr, "Illegal \"b\"\n");
                return -1;
            }
            ok++;
        } else if (strcmp(*argv, "ecn") == 0) {
            ecn_ok = 1;
            ok++;
        } else if (strcmp(*argv, "help") == 0) {
            explain();
            return -1;
        } else {
            fprintf(stderr, "What is \"%s\"?\n", *argv);
            explain();
            return -1;
        }
        argc--; argv++;
    }

    if (!ok)
        return 0;

    if (!opt.qmax || !opt.qref || !opt.a || !opt.b) {
        fprintf(stderr, "Required parameter (qmax, qref, a, b) is
missing\n");
        return -1;
    }

    if (ecn_ok) {
#ifdef TC_RED_ECN
        opt.flags |= TC_PI_ECN;
#else
        fprintf(stderr, "PI: ECN support is missing in this binary.\n");
        return -1;
#endif
    }

    tail = NLMSG_TAIL(n);
    addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
    addattr_l(n, 1024, TCA_PI_PARMS, &opt, sizeof(opt));
    addattr_l(n, 1024, TCA_PI_STAB, sbuf, 256);
    tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
    return 0;
}

static int pi_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
{
    struct rtattr *tb[TCA_PI_STAB+1];
    struct tc_pi_qopt *qopt;
    SPRINT_BUF(b1);
    SPRINT_BUF(b2);
    SPRINT_BUF(b3);
    SPRINT_BUF(b4);

    if (opt == NULL)
        return 0;

    parse_rtattr_nested(tb, TCA_PI_STAB, opt);

    if (tb[TCA_PI_PARMS] == NULL)
        return -1;
    qopt = RTA_DATA(tb[TCA_PI_PARMS]);
    if (RTA_PAYLOAD(tb[TCA_PI_PARMS])  < sizeof(*qopt))
        return -1;
    fprintf(f, "qref %s qmax %s a %s b %s ",
        sprint_size(qopt->qref, b1),
        sprint_size(qopt->qmax, b2),
        sprint_size(qopt->a, b3),
        sprint_size(qopt->b, b4));
#ifdef TC_PI_ECN
    if (qopt->flags & TC_PI_ECN)
        fprintf(f, "ecn ");
#endif
    return 0;
}

static int pi_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr
*xstats)
{
#ifdef TC_RED_ECN
    struct tc_pi_xstats *st;

    if (xstats == NULL)
        return 0;

    if (RTA_PAYLOAD(xstats) < sizeof(*st))
        return -1;

    st = RTA_DATA(xstats);
    fprintf(f, "  marked %u early %u pdrop %u other %u",
        st->marked, st->early, st->pdrop, st->other);
    return 0;

#endif
    return 0;
}


struct qdisc_util pi_qdisc_util = {
    .id        = "pi",
    .parse_qopt    = pi_parse_opt,
    .print_qopt    = pi_print_opt,
    .print_xstats    = pi_print_xstats,
};



-- 
A day without sunshine is like, you know...night.
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