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-rw-r--r--src/libknot/quic/quic_conn.c577
1 files changed, 577 insertions, 0 deletions
diff --git a/src/libknot/quic/quic_conn.c b/src/libknot/quic/quic_conn.c
new file mode 100644
index 0000000..6616573
--- /dev/null
+++ b/src/libknot/quic/quic_conn.c
@@ -0,0 +1,577 @@
+/* Copyright (C) 2023 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <gnutls/gnutls.h>
+#include <ngtcp2/ngtcp2.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "libknot/quic/quic_conn.h"
+
+#include "contrib/macros.h"
+#include "contrib/openbsd/siphash.h"
+#include "contrib/ucw/heap.h"
+#include "contrib/ucw/lists.h"
+#include "libdnssec/random.h"
+#include "libknot/attribute.h"
+#include "libknot/error.h"
+#include "libknot/quic/quic.h"
+#include "libknot/xdp/tcp_iobuf.h"
+#include "libknot/wire.h"
+
+#define STREAM_INCR 4 // DoQ only uses client-initiated bi-directional streams, so stream IDs increment by four
+#define BUCKETS_PER_CONNS 8 // Each connecion has several dCIDs, and each CID takes one hash table bucket.
+
+static int cmp_expiry_heap_nodes(void *c1, void *c2)
+{
+ if (((knot_quic_conn_t *)c1)->next_expiry < ((knot_quic_conn_t *)c2)->next_expiry) return -1;
+ if (((knot_quic_conn_t *)c1)->next_expiry > ((knot_quic_conn_t *)c2)->next_expiry) return 1;
+ return 0;
+}
+
+_public_
+knot_quic_table_t *knot_quic_table_new(size_t max_conns, size_t max_ibufs, size_t max_obufs,
+ size_t udp_payload, struct knot_quic_creds *creds)
+{
+ size_t table_size = max_conns * BUCKETS_PER_CONNS;
+
+ knot_quic_table_t *res = calloc(1, sizeof(*res) + table_size * sizeof(res->conns[0]));
+ if (res == NULL || creds == NULL) {
+ free(res);
+ return NULL;
+ }
+
+ res->size = table_size;
+ res->max_conns = max_conns;
+ res->ibufs_max = max_ibufs;
+ res->obufs_max = max_obufs;
+ res->udp_payload_limit = udp_payload;
+
+ res->expiry_heap = malloc(sizeof(struct heap));
+ if (res->expiry_heap == NULL || !heap_init(res->expiry_heap, cmp_expiry_heap_nodes, 0)) {
+ free(res->expiry_heap);
+ free(res);
+ return NULL;
+ }
+
+ res->creds = creds;
+
+ res->hash_secret[0] = dnssec_random_uint64_t();
+ res->hash_secret[1] = dnssec_random_uint64_t();
+ res->hash_secret[2] = dnssec_random_uint64_t();
+ res->hash_secret[3] = dnssec_random_uint64_t();
+
+ return res;
+}
+
+_public_
+void knot_quic_table_free(knot_quic_table_t *table)
+{
+ if (table != NULL) {
+ while (!EMPTY_HEAP(table->expiry_heap)) {
+ knot_quic_conn_t *c = *(knot_quic_conn_t **)HHEAD(table->expiry_heap);
+ knot_quic_table_rem(c, table);
+ knot_quic_cleanup(&c, 1);
+ }
+ assert(table->usage == 0);
+ assert(table->pointers == 0);
+ assert(table->ibufs_size == 0);
+ assert(table->obufs_size == 0);
+
+ heap_deinit(table->expiry_heap);
+ free(table->expiry_heap);
+ free(table);
+ }
+}
+
+static void send_excessive_load(knot_quic_conn_t *conn, struct knot_quic_reply *reply,
+ knot_quic_table_t *table)
+{
+ if (reply != NULL) {
+ reply->handle_ret = KNOT_QUIC_ERR_EXCESSIVE_LOAD;
+ (void)knot_quic_send(table, conn, reply, 0, 0);
+ }
+}
+
+_public_
+void knot_quic_table_sweep(knot_quic_table_t *table, struct knot_quic_reply *sweep_reply,
+ struct knot_sweep_stats *stats)
+{
+ uint64_t now = 0;
+ if (table == NULL || stats == NULL) {
+ return;
+ }
+
+ while (!EMPTY_HEAP(table->expiry_heap)) {
+ knot_quic_conn_t *c = *(knot_quic_conn_t **)HHEAD(table->expiry_heap);
+ if (table->usage > table->max_conns) {
+ knot_sweep_stats_incr(stats, KNOT_SWEEP_CTR_LIMIT_CONN);
+ send_excessive_load(c, sweep_reply, table);
+ knot_quic_table_rem(c, table);
+ } else if (table->obufs_size > table->obufs_max) {
+ knot_sweep_stats_incr(stats, KNOT_SWEEP_CTR_LIMIT_OBUF);
+ send_excessive_load(c, sweep_reply, table);
+ knot_quic_table_rem(c, table);
+ } else if (table->ibufs_size > table->ibufs_max) {
+ knot_sweep_stats_incr(stats, KNOT_SWEEP_CTR_LIMIT_IBUF);
+ send_excessive_load(c, sweep_reply, table);
+ knot_quic_table_rem(c, table);
+ } else if (quic_conn_timeout(c, &now)) {
+ int ret = ngtcp2_conn_handle_expiry(c->conn, now);
+ if (ret != NGTCP2_NO_ERROR) { // usually NGTCP2_ERR_IDLE_CLOSE or NGTCP2_ERR_HANDSHAKE_TIMEOUT
+ knot_sweep_stats_incr(stats, KNOT_SWEEP_CTR_TIMEOUT);
+ knot_quic_table_rem(c, table);
+ } else {
+ if (sweep_reply != NULL) {
+ sweep_reply->handle_ret = KNOT_EOK;
+ (void)knot_quic_send(table, c, sweep_reply, 0, 0);
+ }
+ quic_conn_mark_used(c, table);
+ }
+ }
+ knot_quic_cleanup(&c, 1);
+
+ if (*(knot_quic_conn_t **)HHEAD(table->expiry_heap) == c) { // HHEAD already handled, NOOP, avoid infinite loop
+ break;
+ }
+ }
+}
+
+static uint64_t cid2hash(const ngtcp2_cid *cid, knot_quic_table_t *table)
+{
+ SIPHASH_CTX ctx;
+ SipHash24_Init(&ctx, (const SIPHASH_KEY *)(table->hash_secret));
+ SipHash24_Update(&ctx, cid->data, MIN(cid->datalen, 8));
+ uint64_t ret = SipHash24_End(&ctx);
+ return ret;
+}
+
+knot_quic_cid_t **quic_table_insert(knot_quic_conn_t *conn, const ngtcp2_cid *cid,
+ knot_quic_table_t *table)
+{
+ uint64_t hash = cid2hash(cid, table);
+
+ knot_quic_cid_t *cidobj = malloc(sizeof(*cidobj));
+ if (cidobj == NULL) {
+ return NULL;
+ }
+ _Static_assert(sizeof(*cid) <= sizeof(cidobj->cid_placeholder), "insufficient placeholder for CID struct");
+ memcpy(cidobj->cid_placeholder, cid, sizeof(*cid));
+ cidobj->conn = conn;
+
+ knot_quic_cid_t **addto = table->conns + (hash % table->size);
+
+ cidobj->next = *addto;
+ *addto = cidobj;
+ table->pointers++;
+
+ return addto;
+}
+
+knot_quic_conn_t *quic_table_add(ngtcp2_conn *ngconn, const ngtcp2_cid *cid,
+ knot_quic_table_t *table)
+{
+ knot_quic_conn_t *conn = calloc(1, sizeof(*conn));
+ if (conn == NULL) {
+ return NULL;
+ }
+
+ conn->conn = ngconn;
+ conn->quic_table = table;
+ conn->stream_inprocess = -1;
+ conn->qlog_fd = -1;
+
+ conn->next_expiry = UINT64_MAX;
+ if (!heap_insert(table->expiry_heap, (heap_val_t *)conn)) {
+ free(conn);
+ return NULL;
+ }
+
+ knot_quic_cid_t **addto = quic_table_insert(conn, cid, table);
+ if (addto == NULL) {
+ heap_delete(table->expiry_heap, heap_find(table->expiry_heap, (heap_val_t *)conn));
+ free(conn);
+ return NULL;
+ }
+ table->usage++;
+
+ return conn;
+}
+
+knot_quic_cid_t **quic_table_lookup2(const ngtcp2_cid *cid, knot_quic_table_t *table)
+{
+ uint64_t hash = cid2hash(cid, table);
+
+ knot_quic_cid_t **res = table->conns + (hash % table->size);
+ while (*res != NULL && !ngtcp2_cid_eq(cid, (const ngtcp2_cid *)(*res)->cid_placeholder)) {
+ res = &(*res)->next;
+ }
+ return res;
+}
+
+knot_quic_conn_t *quic_table_lookup(const ngtcp2_cid *cid, knot_quic_table_t *table)
+{
+ knot_quic_cid_t **pcid = quic_table_lookup2(cid, table);
+ assert(pcid != NULL);
+ return *pcid == NULL ? NULL : (*pcid)->conn;
+}
+
+static void conn_heap_reschedule(knot_quic_conn_t *conn, knot_quic_table_t *table)
+{
+ heap_replace(table->expiry_heap, heap_find(table->expiry_heap, (heap_val_t *)conn), (heap_val_t *)conn);
+}
+
+void quic_conn_mark_used(knot_quic_conn_t *conn, knot_quic_table_t *table)
+{
+ conn->next_expiry = quic_conn_get_timeout(conn);
+ conn_heap_reschedule(conn, table);
+}
+
+void quic_table_rem2(knot_quic_cid_t **pcid, knot_quic_table_t *table)
+{
+ knot_quic_cid_t *cid = *pcid;
+ *pcid = cid->next;
+ free(cid);
+ table->pointers--;
+}
+
+_public_
+void knot_quic_conn_stream_free(knot_quic_conn_t *conn, int64_t stream_id)
+{
+ knot_quic_stream_t *s = knot_quic_conn_get_stream(conn, stream_id, false);
+ if (s != NULL && s->inbuf.iov_len > 0) {
+ free(s->inbuf.iov_base);
+ conn->ibufs_size -= buffer_alloc_size(s->inbuf.iov_len);
+ conn->quic_table->ibufs_size -= buffer_alloc_size(s->inbuf.iov_len);
+ memset(&s->inbuf, 0, sizeof(s->inbuf));
+ }
+ while (s != NULL && s->inbufs != NULL) {
+ void *tofree = s->inbufs;
+ s->inbufs = s->inbufs->next;
+ free(tofree);
+ }
+ knot_quic_stream_ack_data(conn, stream_id, SIZE_MAX, false);
+}
+
+_public_
+void knot_quic_table_rem(knot_quic_conn_t *conn, knot_quic_table_t *table)
+{
+ if (conn == NULL || conn->conn == NULL || table == NULL) {
+ return;
+ }
+
+ if (conn->streams_count == -1) { // kxdpgun special
+ conn->streams_count = 1;
+ }
+ for (ssize_t i = conn->streams_count - 1; i >= 0; i--) {
+ knot_quic_conn_stream_free(conn, (i + conn->streams_first) * 4);
+ }
+ assert(conn->streams_count <= 0);
+ assert(conn->obufs_size == 0);
+
+ size_t num_scid = ngtcp2_conn_get_scid(conn->conn, NULL);
+ ngtcp2_cid *scids = calloc(num_scid, sizeof(*scids));
+ ngtcp2_conn_get_scid(conn->conn, scids);
+
+ for (size_t i = 0; i < num_scid; i++) {
+ knot_quic_cid_t **pcid = quic_table_lookup2(&scids[i], table);
+ assert(pcid != NULL);
+ if (*pcid == NULL) {
+ continue;
+ }
+ assert((*pcid)->conn == conn);
+ quic_table_rem2(pcid, table);
+ }
+
+ int pos = heap_find(table->expiry_heap, (heap_val_t *)conn);
+ heap_delete(table->expiry_heap, pos);
+
+ free(scids);
+
+ gnutls_deinit(conn->tls_session);
+ ngtcp2_conn_del(conn->conn);
+ conn->conn = NULL;
+
+ table->usage--;
+}
+
+_public_
+knot_quic_stream_t *knot_quic_conn_get_stream(knot_quic_conn_t *conn,
+ int64_t stream_id, bool create)
+{
+ if (stream_id % 4 != 0 || conn == NULL) {
+ return NULL;
+ }
+ stream_id /= 4;
+
+ if (conn->streams_first > stream_id) {
+ return NULL;
+ }
+ if (conn->streams_count > stream_id - conn->streams_first) {
+ return &conn->streams[stream_id - conn->streams_first];
+ }
+
+ if (create) {
+ size_t new_streams_count;
+ knot_quic_stream_t *new_streams;
+
+ if (conn->streams_count == 0) {
+ new_streams = malloc(sizeof(new_streams[0]));
+ if (new_streams == NULL) {
+ return NULL;
+ }
+ new_streams_count = 1;
+ conn->streams_first = stream_id;
+ } else {
+ new_streams_count = stream_id + 1 - conn->streams_first;
+ if (new_streams_count > MAX_STREAMS_PER_CONN) {
+ return NULL;
+ }
+ new_streams = realloc(conn->streams, new_streams_count * sizeof(*new_streams));
+ if (new_streams == NULL) {
+ return NULL;
+ }
+ }
+
+ for (knot_quic_stream_t *si = new_streams;
+ si < new_streams + conn->streams_count; si++) {
+ if (si->obufs_size == 0) {
+ init_list((list_t *)&si->outbufs);
+ } else {
+ fix_list((list_t *)&si->outbufs);
+ }
+ }
+
+ for (knot_quic_stream_t *si = new_streams + conn->streams_count;
+ si < new_streams + new_streams_count; si++) {
+ memset(si, 0, sizeof(*si));
+ init_list((list_t *)&si->outbufs);
+ }
+ conn->streams = new_streams;
+ conn->streams_count = new_streams_count;
+
+ return &conn->streams[stream_id - conn->streams_first];
+ }
+ return NULL;
+}
+
+_public_
+knot_quic_stream_t *knot_quic_conn_new_stream(knot_quic_conn_t *conn)
+{
+ int64_t new_id = (conn->streams_first + conn->streams_count) * 4;
+ return knot_quic_conn_get_stream(conn, new_id, true);
+}
+
+static void stream_inprocess(knot_quic_conn_t *conn, knot_quic_stream_t *stream)
+{
+ int16_t idx = stream - conn->streams;
+ assert(idx >= 0);
+ assert(idx < conn->streams_count);
+ if (conn->stream_inprocess < 0 || conn->stream_inprocess > idx) {
+ conn->stream_inprocess = idx;
+ }
+}
+
+static void stream_outprocess(knot_quic_conn_t *conn, knot_quic_stream_t *stream)
+{
+ if (stream != &conn->streams[conn->stream_inprocess]) {
+ return;
+ }
+
+ for (int16_t idx = conn->stream_inprocess + 1; idx < conn->streams_count; idx++) {
+ stream = &conn->streams[idx];
+ if (stream->inbufs != NULL) {
+ conn->stream_inprocess = stream - conn->streams;
+ return;
+ }
+ }
+ conn->stream_inprocess = -1;
+}
+
+int knot_quic_stream_recv_data(knot_quic_conn_t *conn, int64_t stream_id,
+ const uint8_t *data, size_t len, bool fin)
+{
+ if (len == 0 || conn == NULL || data == NULL) {
+ return KNOT_EINVAL;
+ }
+
+ knot_quic_stream_t *stream = knot_quic_conn_get_stream(conn, stream_id, true);
+ if (stream == NULL) {
+ return KNOT_ENOENT;
+ }
+
+ struct iovec in = { (void *)data, len };
+ ssize_t prev_ibufs_size = conn->ibufs_size;
+ int ret = knot_tcp_inbufs_upd(&stream->inbuf, in, true,
+ &stream->inbufs, &conn->ibufs_size);
+ conn->quic_table->ibufs_size += (ssize_t)conn->ibufs_size - prev_ibufs_size;
+ if (ret != KNOT_EOK) {
+ return ret;
+ }
+
+ if (fin && stream->inbufs == NULL) {
+ return KNOT_ESEMCHECK;
+ }
+
+ if (stream->inbufs != NULL) {
+ stream_inprocess(conn, stream);
+ }
+ return KNOT_EOK;
+}
+
+_public_
+knot_quic_stream_t *knot_quic_stream_get_process(knot_quic_conn_t *conn,
+ int64_t *stream_id)
+{
+ if (conn == NULL || conn->stream_inprocess < 0) {
+ return NULL;
+ }
+
+ knot_quic_stream_t *stream = &conn->streams[conn->stream_inprocess];
+ *stream_id = (conn->streams_first + conn->stream_inprocess) * 4;
+ stream_outprocess(conn, stream);
+ return stream;
+}
+
+_public_
+uint8_t *knot_quic_stream_add_data(knot_quic_conn_t *conn, int64_t stream_id,
+ uint8_t *data, size_t len)
+{
+ knot_quic_stream_t *s = knot_quic_conn_get_stream(conn, stream_id, true);
+ if (s == NULL) {
+ return NULL;
+ }
+
+ size_t prefix = sizeof(uint16_t);
+
+ knot_quic_obuf_t *obuf = malloc(sizeof(*obuf) + prefix + len);
+ if (obuf == NULL) {
+ return NULL;
+ }
+
+ obuf->len = len + prefix;
+ knot_wire_write_u16(obuf->buf, len);
+ if (data != NULL) {
+ memcpy(obuf->buf + prefix, data, len);
+ }
+
+ list_t *list = (list_t *)&s->outbufs;
+ if (EMPTY_LIST(*list)) {
+ s->unsent_obuf = obuf;
+ }
+ add_tail((list_t *)&s->outbufs, (node_t *)obuf);
+ s->obufs_size += obuf->len;
+ conn->obufs_size += obuf->len;
+ conn->quic_table->obufs_size += obuf->len;
+
+ return obuf->buf + prefix;
+}
+
+void knot_quic_stream_ack_data(knot_quic_conn_t *conn, int64_t stream_id,
+ size_t end_acked, bool keep_stream)
+{
+ knot_quic_stream_t *s = knot_quic_conn_get_stream(conn, stream_id, false);
+ if (s == NULL) {
+ return;
+ }
+
+ list_t *obs = (list_t *)&s->outbufs;
+
+ knot_quic_obuf_t *first;
+ while (!EMPTY_LIST(*obs) && end_acked >= (first = HEAD(*obs))->len + s->first_offset) {
+ rem_node((node_t *)first);
+ assert(HEAD(*obs) != first); // help CLANG analyzer understand what rem_node did and that further usage of HEAD(*obs) is safe
+ s->obufs_size -= first->len;
+ conn->obufs_size -= first->len;
+ conn->quic_table->obufs_size -= first->len;
+ s->first_offset += first->len;
+ free(first);
+ if (s->unsent_obuf == first) {
+ s->unsent_obuf = EMPTY_LIST(*obs) ? NULL : HEAD(*obs);
+ s->unsent_offset = 0;
+ }
+ }
+
+ if (EMPTY_LIST(*obs) && !keep_stream) {
+ stream_outprocess(conn, s);
+ memset(s, 0, sizeof(*s));
+ init_list((list_t *)&s->outbufs);
+ while (s = &conn->streams[0], s->inbuf.iov_len == 0 && s->inbufs == NULL && s->obufs_size == 0) {
+ assert(conn->streams_count > 0);
+ conn->streams_count--;
+
+ if (conn->streams_count == 0) {
+ free(conn->streams);
+ conn->streams = 0;
+ conn->streams_first = 0;
+ break;
+ } else {
+ conn->streams_first++;
+ conn->stream_inprocess--;
+ memmove(s, s + 1, sizeof(*s) * conn->streams_count);
+ // possible realloc to shrink allocated space, but probably useless
+ for (knot_quic_stream_t *si = s; si < s + conn->streams_count; si++) {
+ if (si->obufs_size == 0) {
+ init_list((list_t *)&si->outbufs);
+ } else {
+ fix_list((list_t *)&si->outbufs);
+ }
+ }
+ }
+ }
+ }
+}
+
+void knot_quic_stream_mark_sent(knot_quic_conn_t *conn, int64_t stream_id,
+ size_t amount_sent)
+{
+ knot_quic_stream_t *s = knot_quic_conn_get_stream(conn, stream_id, false);
+ if (s == NULL) {
+ return;
+ }
+
+ s->unsent_offset += amount_sent;
+ assert(s->unsent_offset <= s->unsent_obuf->len);
+ if (s->unsent_offset == s->unsent_obuf->len) {
+ s->unsent_offset = 0;
+ s->unsent_obuf = (knot_quic_obuf_t *)s->unsent_obuf->node.next;
+ if (s->unsent_obuf->node.next == NULL) { // already behind the tail of list
+ s->unsent_obuf = NULL;
+ }
+ }
+}
+
+_public_
+void knot_quic_cleanup(knot_quic_conn_t *conns[], size_t n_conns)
+{
+ for (size_t i = 0; i < n_conns; i++) {
+ if (conns[i] != NULL && conns[i]->conn == NULL) {
+ free(conns[i]);
+ for (size_t j = i + 1; j < n_conns; j++) {
+ if (conns[j] == conns[i]) {
+ conns[j] = NULL;
+ }
+ }
+ }
+ }
+}
+
+bool quic_require_retry(knot_quic_table_t *table)
+{
+ (void)table;
+ return false;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-06 13:57:55 +0000