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- Improve checks of number of incoming streams limit and associated
  error reporting.
- Small improvements to the recent DNS resolution code.
This commit is contained in:
Dmitri Tikhonov 2018-05-18 10:24:20 -04:00
parent 1da9d1fdd5
commit 7a9b83ff9d
4 changed files with 81 additions and 13 deletions
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5
CHANGELOG
View file

@ -1,3 +1,8 @@
2018-05-18
- Improve checks of number of incoming streams limit and associated
error reporting.
2018-05-16
- [FEATURE] DNS resolution

82
src/liblsquic/lsquic_full_conn.c
View file

@ -95,6 +95,8 @@ enum full_conn_flags {
FC_TICK_CLOSE = (1 <<20), /* We returned TICK_CLOSE */
FC_HSK_FAILED = (1 <<21),
FC_HAVE_SAVED_ACK = (1 <<22),
FC_ABORT_COMPLAINED
= (1 <<23),
};
#define FC_IMMEDIATE_CLOSE_FLAGS \
@ -224,15 +226,17 @@ struct full_conn
snprintf((conn)->fc_errmsg, MAX_ERRMSG, __VA_ARGS__); \
} while (0)
#define ABORT_WITH_FLAG(conn, flag, ...) do { \
#define ABORT_WITH_FLAG(conn, log_level, flag, ...) do { \
SET_ERRMSG(conn, __VA_ARGS__); \
(conn)->fc_flags |= flag; \
LSQ_ERROR("Abort connection: " __VA_ARGS__); \
if (!((conn)->fc_flags & FC_ABORT_COMPLAINED)) \
LSQ_LOG(log_level, "Abort connection: " __VA_ARGS__); \
(conn)->fc_flags |= flag|FC_ABORT_COMPLAINED; \
} while (0)
#define ABORT_ERROR(...) ABORT_WITH_FLAG(conn, FC_ERROR, __VA_ARGS__)
#define ABORT_TIMEOUT(...) ABORT_WITH_FLAG(conn, FC_TIMED_OUT, __VA_ARGS__)
#define ABORT_ERROR(...) \
ABORT_WITH_FLAG(conn, LSQ_LOG_ERROR, FC_ERROR, __VA_ARGS__)
#define ABORT_WARN(...) \
ABORT_WITH_FLAG(conn, LSQ_LOG_WARN, FC_ERROR, __VA_ARGS__)
static void
idle_alarm_expired (void *ctx, lsquic_time_t expiry, lsquic_time_t now);
@ -725,13 +729,51 @@ count_streams (const struct full_conn *conn, int peer)
stream = lsquic_hashelem_getdata(el);
ours = (1 & stream->id) ^ is_server;
if (ours ^ peer)
count += !lsquic_stream_is_closed(stream);
count += !(lsquic_stream_is_closed(stream)
/* When counting peer-initiated streams, do not
* include those that have been reset:
*/
|| (peer && lsquic_stream_is_reset(stream)));
}
return count;
}
enum stream_count { SCNT_ALL, SCNT_PEER, SCNT_CLOSED, SCNT_RESET,
SCNT_RES_UNCLO /* reset and not closed */, N_SCNTS };
static void
collect_stream_counts (const struct full_conn *conn, int peer,
unsigned counts[N_SCNTS])
{
const lsquic_stream_t *stream;
int ours;
int is_server;
struct lsquic_hash_elem *el;
peer = !!peer;
is_server = !!(conn->fc_flags & FC_SERVER);
memset(counts, 0, N_SCNTS * sizeof(counts[0]));
for (el = lsquic_hash_first(conn->fc_pub.all_streams); el;
el = lsquic_hash_next(conn->fc_pub.all_streams))
{
++counts[SCNT_ALL];
stream = lsquic_hashelem_getdata(el);
ours = (1 & stream->id) ^ is_server;
if (ours ^ peer)
{
++counts[SCNT_PEER];
counts[SCNT_CLOSED] += lsquic_stream_is_closed(stream);
counts[SCNT_RESET] += lsquic_stream_is_reset(stream);
counts[SCNT_RES_UNCLO] += lsquic_stream_is_reset(stream)
&& !lsquic_stream_is_closed(stream);
}
}
}
static void
full_conn_ci_destroy (lsquic_conn_t *lconn)
{
@ -1120,8 +1162,17 @@ process_stream_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
LSQ_DEBUG("number of peer-initiated streams: %u", in_count);
if (in_count >= conn->fc_cfg.max_streams_in)
{
ABORT_ERROR("incoming stream would exceed limit: %u",
conn->fc_cfg.max_streams_in);
if (!(conn->fc_flags & FC_ABORT_COMPLAINED))
{
enum stream_count counts[N_SCNTS];
collect_stream_counts(conn, 1, counts);
ABORT_WARN("incoming stream would exceed limit: %u. "
"all: %u; peer: %u; closed: %u; reset: %u; reset "
"and not closed: %u", conn->fc_cfg.max_streams_in,
counts[SCNT_ALL], counts[SCNT_PEER],
counts[SCNT_CLOSED], counts[SCNT_RESET],
counts[SCNT_RES_UNCLO]);
}
lsquic_malo_put(stream_frame);
return 0;
}
@ -3081,8 +3132,17 @@ find_stream_on_non_stream_frame (struct full_conn *conn, uint32_t stream_id,
LSQ_DEBUG("number of peer-initiated streams: %u", in_count);
if (in_count >= conn->fc_cfg.max_streams_in)
{
ABORT_ERROR("incoming %s for stream %u would exceed "
"limit: %u", what, stream_id, conn->fc_cfg.max_streams_in);
if (!(conn->fc_flags & FC_ABORT_COMPLAINED))
{
enum stream_count counts[N_SCNTS];
collect_stream_counts(conn, 1, counts);
ABORT_WARN("incoming %s for stream %u would exceed "
"limit: %u. all: %u; peer: %u; closed: %u; reset: %u; reset "
"and not closed: %u",
what, stream_id, conn->fc_cfg.max_streams_in, counts[SCNT_ALL],
counts[SCNT_PEER], counts[SCNT_CLOSED], counts[SCNT_RESET],
counts[SCNT_RES_UNCLO]);
}
return NULL;
}
if ((conn->fc_flags & FC_GOING_AWAY) &&

5
test/prog.c
View file

@ -92,8 +92,7 @@ prog_print_common_options (const struct prog *prog, FILE *out)
#else
" -s SERVER Server address. Takes on the form of host:port or host.\n"
" If host is not an IPv4 or IPv6 address, it is resolved.\n"
" If port is not set, the default is 443. If -s is not\n"
" specified, the value of SNI is used (see the -H flag).\n"
" If port is not set, the default is 443.\n"
#endif
" Examples:\n"
" 127.0.0.1:12345\n"
@ -103,6 +102,8 @@ prog_print_common_options (const struct prog *prog, FILE *out)
#if HAVE_REGEX
" 8443\n"
#endif
" If -s is not specified, the value of SNI is used (see\n"
" the -H flag).\n"
#if LSQUIC_DONTFRAG_SUPPORTED
" -D Set `do not fragment' flag on outgoing UDP packets\n"
#endif

2
test/test_common.c
View file

@ -28,6 +28,8 @@
#include <sys/queue.h>
#include <fcntl.h>
#include <sys/types.h>
#include "test_config.h"
#if HAVE_REGEX
#include <regex.h>
#endif