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Better classification

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This commit is contained in:
Quentin 2019-08-30 10:39:00 +02:00
parent f4fa63fcef
commit 3f40d205c9
1 changed files with 57 additions and 6 deletions
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61
src/algo_thunder.c
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@ -7,7 +7,7 @@
// A Tor cell size is 512 bytes but handle only 498 bytes of data
#define TOR_CELL_SIZE 498
#define ALLOWED_JITTER_MS 100
#define ALLOWED_JITTER_MS 200
#define MAX_LINKS 64
struct thunder_ctx {
@ -16,10 +16,11 @@ struct thunder_ctx {
uint8_t selected_link;
uint8_t total_links;
uint64_t delta_t_per_link[MAX_LINKS];
uint64_t rcv_delta_t_per_link[MAX_LINKS];
uint64_t received_pkts_on_link[MAX_LINKS];
uint64_t blacklisted[MAX_LINKS];
size_t monit_pkt_size;
struct timespec prev_link_time, prev_packet_time;
struct timespec prev_link_time, prev_rcv_link_time;
};
uint64_t compute_delta(struct timespec* prev_time, uint64_t max) {
@ -176,6 +177,16 @@ release:
free(bi);
}
int is_in_order(struct thunder_ctx* thunderc, uint8_t link_id) {
uint64_t ref = thunderc->received_pkts_on_link[link_id];
for (int i = 0; i < thunderc->total_links; i++) {
uint64_t expected = link_id > i ? ref - 1 : ref;
if (thunderc->received_pkts_on_link[i] > expected) return 0;
}
return 1;
}
void classify(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct buffer_packet* bp) {
struct algo_ctx* app_ctx = fdinfo->cat->app_ctx;
struct thunder_ctx* thunderc = app_ctx->misc;
@ -187,27 +198,67 @@ void classify(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct b
exit(EXIT_FAILURE);
}
/*
if (ap->fmt.headers.flags & FLAG_RESET) {
for (int i = 0; i < MAX_LINKS; i++) thunderc->received_pkts_on_link[i] = 1;
}
*/
// 1. Update link info
int link_id = url_get_port_int(fdinfo->url) - 7500;
thunderc->received_pkts_on_link[link_id]++;
printf("Received %ld packets on link %d\n", thunderc->received_pkts_on_link[link_id], link_id);
struct link_info *li = &ap->fmt.content.link_monitoring_thunder.links_status;
uint64_t mili_sec = compute_delta (&thunderc->prev_rcv_link_time, UINT16_MAX);
for (int i = 0; i < thunderc->total_links; i++) {
thunderc->rcv_delta_t_per_link[i] += mili_sec;
}
thunderc->rcv_delta_t_per_link[link_id] = 0;
// 2. Disable links that have received packets too late
if (is_in_order (thunderc, link_id)) {
printf("Local: ");
for (int i = 0; i < thunderc->total_links; i++) {
printf("%ld ", thunderc->rcv_delta_t_per_link[i]);
}
printf("\n");
printf("Packet: ");
for (int i = 0; i < thunderc->total_links; i++) {
printf("%d ", li[i].delta_t);
}
printf("\n");
for (int i = 0; i < thunderc->total_links; i++) {
if (ALLOWED_JITTER_MS >= li[i].delta_t) continue;
if (li[i].delta_t - ALLOWED_JITTER_MS <= thunderc->rcv_delta_t_per_link[i]) continue;
struct block_info *bi = malloc(sizeof(struct block_info));
bi->i = i; bi->app_ctx = app_ctx; bi->missing = thunderc->received_pkts_on_link[i]+1;
printf(" Packet Too Late - Blocked link %d (expected: at least %dms ago, received: %ldms ago)\n", i, li[i].delta_t - ALLOWED_JITTER_MS, thunderc->rcv_delta_t_per_link[i]);
on_block(ctx, bi);
}
}
// 3. Disable links that miss packets
for (uint8_t i = 0; i < thunderc->total_links; i++) {
uint64_t expected = i <= link_id ? thunderc->received_pkts_on_link[link_id] : thunderc->received_pkts_on_link[link_id] - 1;
if (thunderc->received_pkts_on_link[i] >= expected) continue; // Nothing to do, all packets have been received
int64_t timeout = ALLOWED_JITTER_MS - li[i].delta_t;
if (timeout < 0) timeout = 0;
struct block_info *bi = malloc(sizeof(struct block_info));
bi->i = i; bi->app_ctx = app_ctx; bi->missing = expected;
if (timeout <= 0) {
on_block(ctx, bi);
printf(" Missing Packet - Blocked link %d (expected: %ld, seen: %ld, )\n", i, expected, thunderc->received_pkts_on_link[i]);
continue;
}
set_timeout (ctx, timeout, bi, on_block);
printf(" Triggered timeout for link %d in %ldms (expected: %ld, seen: %ld)\n", i, timeout, expected, thunderc->received_pkts_on_link[i]);
printf(" Missing Packet - Triggered timeout for link %d in %ldms (expected: %ld, seen: %ld)\n", i, timeout, expected, thunderc->received_pkts_on_link[i]);
if (ctx->verbose > 1) {
fprintf(stderr, " [algo_thunder] Set timeout on link %d of %ld ms (packets expected: %ld, seen: %ld)\n",
i, timeout, expected, thunderc->received_pkts_on_link[i]);