tor_multipath_voip/src/algo_thunder.c

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#include <sys/timerfd.h>
#include "algo_utils.h"
#include "utils.h"
#include "url.h"
#include "proxy.h"
#include "timer.h"
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#include "proxy.h"
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#define PROBE_EVERY 2
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uint64_t compute_delta(struct timespec* prev_time, uint64_t max, uint8_t update) {
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struct timespec curr;
int secs, nsecs;
uint64_t mili_sec;
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// 1. We compute the time difference
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if (clock_gettime(CLOCK_MONOTONIC, &curr) == -1){
perror("clock_gettime error");
exit(EXIT_FAILURE);
}
secs = curr.tv_sec - prev_time->tv_sec;
nsecs = curr.tv_nsec - prev_time->tv_nsec;
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if(update) *prev_time = curr;
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mili_sec = secs * 1000 + nsecs / 1000000;
if (mili_sec > max) mili_sec = max;
return mili_sec;
}
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int is_blacklisted(struct thunder_ctx* thunderc, int link_id) {
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if (thunderc->scheduler_activated)
return thunderc->blacklisted[link_id] >= thunderc->received_pkts_on_link[link_id];
return 0;
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}
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void prepare(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct buffer_packet* bp) {
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struct algo_ctx* app_ctx = fdinfo->cat->app_ctx;
struct thunder_ctx* thunderc = app_ctx->misc;
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thunderc->emit_id++;
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union abstract_packet metadata = {
.fmt.headers.cmd = CMD_UDP_METADATA_THUNDER,
.fmt.headers.size = sizeof(metadata.fmt.headers) + sizeof(metadata.fmt.content.udp_metadata_thunder),
.fmt.headers.flags = 0,
.fmt.content.udp_metadata_thunder.id = thunderc->emit_id,
};
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buffer_append_ap (bp, &metadata);
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if (ctx->verbose > 1) fprintf(stderr, " [algo_thunder] UDP metadata added\n");
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}
void pad(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct buffer_packet* bp) {
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struct algo_ctx* app_ctx = fdinfo->cat->app_ctx;
struct thunder_ctx* thunderc = app_ctx->misc;
uint64_t ref = 0l + thunderc->emit_id;
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dup_buffer_toa (&app_ctx->br, bp, (void *)ref);
// 1. Clean old buffers (we keep only thunderc->total_links buffer, keeping more would be useless)
if (ref > thunderc->total_links && get_app_buffer (&app_ctx->br, (void *)(ref - thunderc->total_links))) {
mv_buffer_atof (&app_ctx->br, (void *)(ref - thunderc->total_links));
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}
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// 2. Append abstract packets stored in our buffers
uint64_t add_ref = ref;
while(1) {
if (add_ref < 1) break;
add_ref--;
struct buffer_packet *bp_iter = get_app_buffer (&app_ctx->br, (void *)add_ref);
if (bp_iter == NULL) break;
union abstract_packet *ap = buffer_first_ap (bp_iter);
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if (ap->fmt.headers.cmd != CMD_UDP_ENCAPSULATED) {
fprintf(stderr, "Invalid buffer payload!\n");
exit(EXIT_FAILURE);
}
union abstract_packet *ap_meta = ap_next (ap);
if (ap_meta->fmt.headers.cmd != CMD_UDP_METADATA_THUNDER) {
fprintf(stderr, "Invalid buffer metadata!\n");
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exit(EXIT_FAILURE);
}
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if (buffer_full_size (bp) + ap->fmt.headers.size + ap_meta->fmt.headers.size > TOR_CELL_SIZE - thunderc->monit_pkt_size) break;
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buffer_append_ap (bp, ap);
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buffer_append_ap (bp, ap_meta);
if (ctx->verbose > 1) fprintf(stderr, " [algo_thunder] Pad packet (now %ld bytes)\n", buffer_full_size (bp));
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}
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}
int schedule(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct buffer_packet* bp) {
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char url[256];
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struct algo_ctx* app_ctx = fdinfo->cat->app_ctx;
struct thunder_ctx* thunderc = app_ctx->misc;
struct evt_core_fdinfo *to_fdinfo = NULL;
struct evt_core_cat* cat = evt_core_get_from_cat (ctx, "tcp-write");
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int64_t protect = thunderc->total_links;
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do {
// 1. We choose the link
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if (cat->socklist->len == 0) {
if (ctx->verbose > 1) fprintf(stderr, " [algo_thunder] No link available, packet will be dropped\n");
break;
}
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int64_t protect2 = thunderc->total_links;
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to_fdinfo = NULL;
do {
thunderc->selected_link = (thunderc->selected_link + 1) % thunderc->total_links;
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thunderc->to_increment[thunderc->selected_link]++;
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sprintf(url, "tcp:write:127.0.0.1:%d", 7500 + thunderc->selected_link);
to_fdinfo = evt_core_get_from_url (ctx, url);
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} while (to_fdinfo == NULL && --protect2 >= 0);
if (protect2 < 0) {
fprintf(stderr, " [algo_thunder] scheduler/no link available\n");
goto schedule_release;
}
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// We let some time for blacklisted links to recover
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if (is_blacklisted (thunderc, thunderc->selected_link) && thunderc->to_increment[thunderc->selected_link] < PROBE_EVERY) continue;
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//printf("URL %s has been retained\n", url);
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// 2. We create the packet template
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union abstract_packet links = {
.fmt.headers.cmd = CMD_LINK_MONITORING_THUNDER,
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.fmt.headers.size = thunderc->monit_pkt_size,
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.fmt.headers.flags = 0,
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.fmt.content.link_monitoring_thunder.to_increment = thunderc->to_increment[thunderc->selected_link],
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.fmt.content.link_monitoring_thunder.links_status = {}
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};
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thunderc->to_increment[thunderc->selected_link] = 0;
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// 3. We append the template to the buffer
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struct buffer_packet* bp_dup = dup_buffer_tow (&app_ctx->br, bp, to_fdinfo);
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union abstract_packet *new_ap = buffer_append_ap (bp_dup, &links);
// 4. We compute the time difference
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uint64_t mili_sec = 0;
if (protect == thunderc->total_links)
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mili_sec = compute_delta (&thunderc->prev_link_time, UINT16_MAX, 1);
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//printf("send packet on link %d with delta=%ld\n", thunderc->selected_link, mili_sec);
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// 5. We create the array
struct link_info *li = &new_ap->fmt.content.link_monitoring_thunder.links_status;
for (int i = 0; i < thunderc->total_links; i++) {
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if (thunderc->sent_pkts_on_link[i] == 0) continue;
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thunderc->delta_t_per_link[i] += mili_sec;
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li[i].delta_t = thunderc->delta_t_per_link[i] > UINT16_MAX ? UINT16_MAX : thunderc->delta_t_per_link[i];
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}
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thunderc->delta_t_per_link[thunderc->selected_link] = 0;
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li[thunderc->selected_link].delta_t = 0;
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thunderc->sent_pkts_on_link[thunderc->selected_link]++;
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if (ctx->verbose > 1) {
dump_buffer_packet(bp_dup);
fprintf(stderr, " [algo_thunder] Will send this info\n");
}
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main_on_tcp_write(ctx, to_fdinfo);
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} while (is_blacklisted (thunderc, thunderc->selected_link) && --protect >= 0);
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if (protect < 0) {
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fprintf(stderr, "all links were blacklisted, resetting\n");
for (int i = 0; i < thunderc->total_links; i++) {
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fprintf(stderr, " link=%d, blacklisted=%ld, rcved=%ld\n", i, thunderc->blacklisted[i], thunderc->received_pkts_on_link[i]);
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thunderc->received_pkts_on_link[i] = thunderc->blacklisted[i] + 1;
}
}
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if (ctx->verbose > 1) fprintf(stderr, " [algo_thunder] Packets sent\n");
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schedule_release:
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// Release the buffer
mv_buffer_rtof (&app_ctx->br, fdinfo);
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return 0;
}
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struct block_info {
uint8_t i;
struct algo_ctx* app_ctx;
uint64_t missing;
uint8_t is_timeout;
char reason[1024];
};
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void on_block (struct evt_core_ctx* ctx, void* raw) {
struct block_info* bi = raw;
struct thunder_ctx* thunderc = bi->app_ctx->misc;
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if (bi->is_timeout && thunderc->received_pkts_on_link[bi->i] >= bi->missing) goto release;
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if (thunderc->blacklisted[bi->i] >= bi->missing) goto release;
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printf("%s\n", bi->reason);
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thunderc->blacklisted[bi->i] = bi->missing;
release:
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if (bi->is_timeout) free(bi);
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}
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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++) {
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uint64_t expected = link_id >= i ? ref : ref - 1;
if (thunderc->received_pkts_on_link[i] > expected) {
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//printf("link_id=%d, i=%d, pkt_i=%ld, pkt_i_expected=%ld, pkt_link_id=%ld\n", link_id, i, thunderc->received_pkts_on_link[i], expected, ref);
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return 0;
}
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}
return 1;
}
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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;
union abstract_packet* ap = buffer_first_ap (bp);
while (ap != NULL && ap->fmt.headers.cmd != CMD_LINK_MONITORING_THUNDER) ap = ap_next(ap);
if (ap == NULL) {
fprintf(stderr, "Unable to find our packet\n");
exit(EXIT_FAILURE);
}
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// 1. Update link info
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int link_id = url_get_port_int(fdinfo->url) - 7500;
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thunderc->received_pkts_on_link[link_id] += ap->fmt.content.link_monitoring_thunder.to_increment;
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//printf("Received %ld packets on link %d\n", thunderc->received_pkts_on_link[link_id], link_id);
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struct link_info *li = &ap->fmt.content.link_monitoring_thunder.links_status;
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uint64_t mili_sec = compute_delta (&thunderc->prev_rcv_link_time, UINT16_MAX, 1);
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for (int i = 0; i < thunderc->total_links; i++) {
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if (thunderc->received_pkts_on_link[i] <= 1) continue;
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thunderc->rcv_delta_t_per_link[i] += mili_sec;
}
thunderc->rcv_delta_t_per_link[link_id] = 0;
// 3. Disable links that miss packets
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for (uint8_t i = 0; i < thunderc->total_links; i++) {
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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
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int64_t timeout = thunderc->allowed_jitter_ms - li[i].delta_t;
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struct block_info *bi = malloc(sizeof(struct block_info));
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bi->i = i; bi->app_ctx = app_ctx; bi->missing = expected; bi->is_timeout = 1;
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sprintf(bi->reason, " Missing Packet - Timeout for link %d after %ldms (expected: %ld, seen: %ld)", i, timeout, expected, thunderc->received_pkts_on_link[i]);
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if (timeout <= 0) {
on_block(ctx, bi);
continue;
}
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set_timeout (ctx, timeout, bi, on_block);
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}
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if (ctx->verbose > 1) fprintf(stderr, " [algo_thunder] Classify done\n");
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if (thunderc->scheduler_activated) {
uint64_t ts = compute_delta (&thunderc->start_time, UINT64_MAX, 0);
printf("[%ld] Blacklisted links: ", ts);
for (int i = 0; i < thunderc->total_links; i++) {
if (is_blacklisted (thunderc, i)) printf("_");
else printf("U");
}
printf("\n");
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}
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}
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struct unpad_info {
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union abstract_packet *ap_arr_pl[MAX_LINKS],
*ap_arr_meta[MAX_LINKS];
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uint8_t ap_arr_vals;
};
void unpad(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct buffer_packet* bp, struct unpad_info *ui) {
struct algo_ctx* app_ctx = fdinfo->cat->app_ctx;
struct thunder_ctx* thunderc = app_ctx->misc;
for (union abstract_packet* ap = buffer_first_ap (bp); ap != NULL; ap = ap_next(ap)) {
if (ap->fmt.headers.cmd != CMD_UDP_ENCAPSULATED) continue;
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union abstract_packet* ap_meta = ap_next(ap);
if (ap_meta == NULL || ap_meta->fmt.headers.cmd != CMD_UDP_METADATA_THUNDER) {
fprintf(stderr, "Unexpected packet, expecting udp metadata\n");
}
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ui->ap_arr_pl[ui->ap_arr_vals] = ap;
ui->ap_arr_meta[ui->ap_arr_vals] = ap_meta;
ui->ap_arr_vals++;
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}
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if (ctx->verbose > 1) fprintf(stderr, " [algo_thunder] Unpad done\n");
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}
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int compare_int64(const void *a,const void *b) {
int64_t *x = (int64_t *) a;
int64_t *y = (int64_t *) b;
return *x - *y;
}
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void adapt(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct buffer_packet* bp, struct unpad_info *ui) {
struct algo_ctx* app_ctx = fdinfo->cat->app_ctx;
struct thunder_ctx* thunderc = app_ctx->misc;
char url[256];
struct evt_core_fdinfo *to_fdinfo = NULL;
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uint64_t delivered = 0;
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for (int i = ui->ap_arr_vals-1; i >= 0; i--) {
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//fprintf(stderr, "i=%d, ui->ap_arr_vals=%d\n", i, ui->ap_arr_vals);
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if (ui->ap_arr_meta[i]->fmt.content.udp_metadata_thunder.id <= thunderc->recv_id) continue; // already delivered
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thunderc->recv_id = ui->ap_arr_meta[i]->fmt.content.udp_metadata_thunder.id;
// Find destination
sprintf(url, "udp:write:127.0.0.1:%d", ui->ap_arr_pl[i]->fmt.content.udp_encapsulated.port);
to_fdinfo = evt_core_get_from_url (ctx, url);
if (to_fdinfo == NULL) {
fprintf(stderr, "No fd for URL %s in tcp-read. Dropping packet :( \n", url);
}
struct buffer_packet *bp_dest = inject_buffer_tow (&app_ctx->br, to_fdinfo);
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bp_dest->mode = BP_WRITING;
//dump_buffer_packet (bp_dest);
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buffer_append_ap (bp_dest, ui->ap_arr_pl[i]);
main_on_udp_write(ctx, to_fdinfo);
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delivered++;
}
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printf("[algo_thunder] Delivered %ld packets (now id=%d)\n", delivered, thunderc->recv_id);
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if (delivered > 4) {
dump_buffer_packet (bp);
}
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mv_buffer_rtof (&app_ctx->br, fdinfo);
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if (ctx->verbose > 1) fprintf(stderr, " [algo_thunder] Adapt done\n");
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}
int algo_thunder_on_stream(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct buffer_packet* bp) {
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struct unpad_info ui = {0};
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classify(ctx, fdinfo, bp);
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unpad(ctx, fdinfo, bp, &ui);
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adapt(ctx, fdinfo, bp, &ui);
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return 0;
}
int algo_thunder_on_datagram(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct buffer_packet* bp) {
prepare(ctx, fdinfo, bp);
pad(ctx, fdinfo, bp);
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schedule(ctx, fdinfo, bp);
return 0;
}
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void algo_thunder_free(void* v) {
struct rr_ctx* rr = v;
free(rr);
}
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void algo_thunder_init(struct evt_core_ctx* ctx, struct algo_ctx* app_ctx, struct algo_params* ap) {
app_ctx->misc = malloc(sizeof(struct thunder_ctx));
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app_ctx->free_misc = algo_thunder_free;
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if (app_ctx->misc == NULL) {
perror("malloc failed in algo thunder init");
exit(EXIT_FAILURE);
}
memset(app_ctx->misc, 0, sizeof(struct thunder_ctx));
struct thunder_ctx* thunderc = app_ctx->misc;
thunderc->recv_id = 1;
thunderc->emit_id = 1;
thunderc->total_links = app_ctx->ap.links;
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thunderc->selected_link = thunderc->total_links - 1;
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thunderc->allowed_jitter_ms = 200;
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for (int i = 0; i < thunderc->total_links; i++) {
thunderc->received_pkts_on_link[i] = 1;
thunderc->rcv_delta_t_per_link[i] = 0;
}
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if (clock_gettime(CLOCK_MONOTONIC, &thunderc->start_time) == -1){
perror("clock_gettime error");
exit(EXIT_FAILURE);
}
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union abstract_packet links = {};
//fprintf(stderr, "Total links %d\n", thunderc->total_links);
thunderc->monit_pkt_size = sizeof(links.fmt.headers) + sizeof(links.fmt.content.link_monitoring_thunder) + sizeof(struct link_info) * (thunderc->total_links - 1);
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if (ap->algo_specific_params != NULL) {
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char *parse_ptr, *token, *params;
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for (params = ap->algo_specific_params; ; params = NULL) {
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token = strtok_r(params, ",", &parse_ptr);
if (token == NULL) break;
sscanf(token, "jitter=%ld", &thunderc->allowed_jitter_ms);
sscanf(token, "scheduler=%d", &thunderc->scheduler_activated);
}
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}
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printf("Allowed jitter set to %ld ms\n", thunderc->allowed_jitter_ms);
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printf("Scheduler is %s\n", thunderc->scheduler_activated ? "activated" : "deactivated");
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init_timer(ctx);
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}
int algo_thunder_on_err(struct evt_core_ctx *ctx, struct evt_core_fdinfo *fdinfo) {
if (strstr(fdinfo->cat->name, "udp") != NULL) return 1;
return 0;
}