| … | |
… | |
| 55 | |
55 | |
| 56 | #define MIN_SEND_INTERVAL 0.01 // wait at least this time between sending requests |
56 | #define MIN_SEND_INTERVAL 0.01 // wait at least this time between sending requests |
| 57 | #define MAX_SEND_INTERVAL 2. // optimistic? |
57 | #define MAX_SEND_INTERVAL 2. // optimistic? |
| 58 | |
58 | |
| 59 | #define LATENCY_FACTOR 0.5 // RTT * LATENCY_FACTOR == sending rate |
59 | #define LATENCY_FACTOR 0.5 // RTT * LATENCY_FACTOR == sending rate |
| 60 | #define MAX_OUTSTANDING 40 // max. outstanding requests |
60 | #define MAX_OUTSTANDING 100 // max. outstanding requests |
| 61 | #define MAX_WINDOW 1000 // max. for MAX_OUTSTANDING, and backlog |
61 | #define MAX_WINDOW 1000 // max. for MAX_OUTSTANDING, and backlog |
| 62 | #define MAX_BACKLOG (100*1024) // size of gvpe protocol backlog (bytes), must be > MAXSIZE |
62 | #define MAX_BACKLOG (100*1024) // size of gvpe protocol backlog (bytes), must be > MAXSIZE |
| 63 | |
63 | |
| 64 | #define MAX_DOMAIN_SIZE 200 // 255 is legal limit, but bind doesn't compress well |
64 | #define MAX_DOMAIN_SIZE 240 // 255 is legal limit, but bind doesn't compress well |
| 65 | // 240 leaves about 4 bytes of server reply data |
65 | // 240 leaves about 4 bytes of server reply data |
| 66 | // every two request bytes less give room for one reply byte |
66 | // every two request bytes less give room for one reply byte |
| 67 | |
67 | |
| 68 | #define SEQNO_MASK 0x3fff |
68 | #define SEQNO_MASK 0x3fff |
| 69 | #define SEQNO_EQ(a,b) ( 0 == ( ((a) ^ (b)) & SEQNO_MASK) ) |
69 | #define SEQNO_EQ(a,b) ( 0 == ( ((a) ^ (b)) & SEQNO_MASK) ) |
| … | |
… | |
| 1238 | } |
1238 | } |
| 1239 | else |
1239 | else |
| 1240 | NEXT (r->timeout); |
1240 | NEXT (r->timeout); |
| 1241 | } |
1241 | } |
| 1242 | |
1242 | |
| 1243 | if (send || (last_sent + send_interval <= NOW)) |
|
|
| 1244 | { |
|
|
| 1245 | if (!send) |
1243 | if (!send) |
|
|
1244 | { |
|
|
1245 | if (last_sent + send_interval <= NOW) |
| 1246 | { |
1246 | { |
| 1247 | // generate a new packet, if wise |
1247 | // generate a new packet, if wise |
| 1248 | |
1248 | |
| 1249 | if (!established) |
1249 | if (!established) |
| 1250 | { |
1250 | { |
| … | |
… | |
| 1271 | send->timeout = NOW + min_latency * 8.; |
1271 | send->timeout = NOW + min_latency * 8.; |
| 1272 | |
1272 | |
| 1273 | sndseq = (sndseq + 1) & SEQNO_MASK; |
1273 | sndseq = (sndseq + 1) & SEQNO_MASK; |
| 1274 | } |
1274 | } |
| 1275 | |
1275 | |
| 1276 | if (send && !send->retry) |
1276 | if (send) |
| 1277 | vpn->dns_sndpq.push_back (send); |
1277 | vpn->dns_sndpq.push_back (send); |
| 1278 | } |
1278 | } |
|
|
1279 | else |
|
|
1280 | NEXT (last_sent + send_interval); |
|
|
1281 | } |
| 1279 | |
1282 | |
| 1280 | if (send) |
1283 | if (send) |
| 1281 | { |
1284 | { |
| 1282 | last_sent = NOW; |
1285 | last_sent = NOW; |
| 1283 | sendto (vpn->dnsv4_fd, |
1286 | sendto (vpn->dnsv4_fd, |
| 1284 | send->pkt->at (0), send->pkt->len, 0, |
1287 | send->pkt->at (0), send->pkt->len, 0, |
| 1285 | vpn->dns_forwarder.sav4 (), vpn->dns_forwarder.salenv4 ()); |
1288 | vpn->dns_forwarder.sav4 (), vpn->dns_forwarder.salenv4 ()); |
| 1286 | } |
|
|
| 1287 | } |
1289 | } |
| 1288 | else |
|
|
| 1289 | NEXT (last_sent + send_interval); |
|
|
| 1290 | |
1290 | |
| 1291 | slog (L_NOISE, "DNS: pi %f si %f N %f (%d:%d %d)", |
1291 | slog (L_NOISE, "DNS: pi %f si %f N %f (%d:%d %d)", |
| 1292 | poll_interval, send_interval, next - NOW, |
1292 | poll_interval, send_interval, next - NOW, |
| 1293 | vpn->dns_sndpq.size (), snddq.size (), |
1293 | vpn->dns_sndpq.size (), snddq.size (), |
| 1294 | rcvpq.size ()); |
1294 | rcvpq.size ()); |
