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test-ndisc-rs.c: Test Router Solicitation timer computation

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Test ICMPv6 Router Solicitation exponential backoff timer by
computing the minimum and maximum values according to RFC 7559,
Section 2 and the algorithm itself described in RFC 3315, Section
14. Reset the sd_ndisc timer to trigger after a zero second delay,
which causes the ndisc timeout to be triggered immediately once
the caller of the "sending" function returns to the main loop.
This commit is contained in:
Patrik Flykt
2017-05-19 16:22:47 +03:00
parent e82a19cb18
commit 5a67ed2403
1 changed files with 100 additions and 0 deletions
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100
src/libsystemd-network/test-ndisc-rs.c
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@@ -27,6 +27,7 @@
#include "icmp6-util.h"
#include "socket-util.h"
#include "strv.h"
#include "ndisc-internal.h"
static struct ether_addr mac_addr = {
.ether_addr_octet = {'A', 'B', 'C', '1', '2', '3'}
@@ -35,6 +36,7 @@ static struct ether_addr mac_addr = {
static bool verbose = false;
static sd_event_source *test_hangcheck;
static int test_fd[2];
static sd_ndisc *test_timeout_nd;
typedef int (*send_ra_t)(uint8_t flags);
static send_ra_t send_ra_function;
@@ -237,6 +239,9 @@ static int send_ra(uint8_t flags) {
}
int icmp6_send_router_solicitation(int s, const struct ether_addr *ether_addr) {
if (!send_ra_function)
return 0;
return send_ra_function(0);
}
@@ -320,6 +325,100 @@ static void test_rs(void) {
sd_event_unref(e);
}
static int test_timeout_value(uint8_t flags) {
static int count = 0;
static usec_t last = 0;
sd_ndisc *nd = test_timeout_nd;
usec_t min, max;
char time_string_min[FORMAT_TIMESPAN_MAX];
char time_string_nd[FORMAT_TIMESPAN_MAX];
char time_string_max[FORMAT_TIMESPAN_MAX];
assert_se(nd);
assert_se(nd->event);
if (++count >= 20)
sd_event_exit(nd->event, 0);
if (last == 0) {
/* initial RT = IRT + RAND*IRT */
min = NDISC_ROUTER_SOLICITATION_INTERVAL -
NDISC_ROUTER_SOLICITATION_INTERVAL / 10;
max = NDISC_ROUTER_SOLICITATION_INTERVAL +
NDISC_ROUTER_SOLICITATION_INTERVAL / 10;
} else {
/* next RT = 2*RTprev + RAND*RTprev */
min = 2 * last - last / 10;
max = 2 * last + last / 10;
}
/* final RT > MRT */
if (last * 2 > NDISC_MAX_ROUTER_SOLICITATION_INTERVAL) {
min = NDISC_MAX_ROUTER_SOLICITATION_INTERVAL -
NDISC_MAX_ROUTER_SOLICITATION_INTERVAL / 10;
max = NDISC_MAX_ROUTER_SOLICITATION_INTERVAL +
NDISC_MAX_ROUTER_SOLICITATION_INTERVAL / 10;
}
format_timespan(time_string_min, FORMAT_TIMESPAN_MAX,
min, USEC_PER_MSEC);
format_timespan(time_string_nd, FORMAT_TIMESPAN_MAX,
nd->retransmit_time, USEC_PER_MSEC);
format_timespan(time_string_max, FORMAT_TIMESPAN_MAX,
max, USEC_PER_MSEC);
log_info("backoff timeout interval %2d %s%s <= %s <= %s",
count,
(last * 2 > NDISC_MAX_ROUTER_SOLICITATION_INTERVAL)? "(max) ": "",
time_string_min, time_string_nd, time_string_max);
assert_se(min <= nd->retransmit_time);
assert_se(max >= nd->retransmit_time);
last = nd->retransmit_time;
assert_se(sd_event_source_set_time(nd->timeout_event_source, 0) >= 0);
return 0;
}
static void test_timeout(void) {
sd_event *e;
sd_ndisc *nd;
usec_t time_now = now(clock_boottime_or_monotonic());
if (verbose)
printf("* %s\n", __FUNCTION__);
send_ra_function = test_timeout_value;
assert_se(sd_event_new(&e) >= 0);
assert_se(sd_ndisc_new(&nd) >= 0);
assert_se(nd);
test_timeout_nd = nd;
assert_se(sd_ndisc_attach_event(nd, e, 0) >= 0);
assert_se(sd_ndisc_set_ifindex(nd, 42) >= 0);
assert_se(sd_ndisc_set_mac(nd, &mac_addr) >= 0);
assert_se(sd_event_add_time(e, &test_hangcheck, clock_boottime_or_monotonic(),
time_now + 2U * USEC_PER_SEC, 0,
test_rs_hangcheck, NULL) >= 0);
assert_se(sd_ndisc_start(nd) >= 0);
sd_event_loop(e);
test_hangcheck = sd_event_source_unref(test_hangcheck);
nd = sd_ndisc_unref(nd);
sd_event_unref(e);
}
int main(int argc, char *argv[]) {
log_set_max_level(LOG_DEBUG);
@@ -327,6 +426,7 @@ int main(int argc, char *argv[]) {
log_open();
test_rs();
test_timeout();
return 0;
}