c5e9d0096a
nghttpx: Fix crash when ConnectionHandler is deleted while doing memcached request
2021-08-29 17:17:36 +09:00
ef694923f7
Provide enum bpf_stats_type if not defined in linux/bpf.h for older kernel
2021-08-29 14:30:59 +09:00
8d02203bb6
Add LIBBPF_CFLAGS for eBPF program and nghttpx
2021-08-29 13:58:10 +09:00
7d13891066
nghttpx: Rename eBPF options
2021-08-27 21:34:18 +09:00
4292bd7ad9
nghttpx: Set max udp payload size to IPv4 minimum payload size for now
2021-08-27 21:26:50 +09:00
82cd110dbe
nghttpx: Use SHRPX_MAX_UDP_PAYLOAD_SIZE
2021-08-27 21:13:26 +09:00
d2729193c7
nghttpx: Add --frontend-http3-max-concurrent-streams option
2021-08-27 21:11:03 +09:00
87fb325357
nghttpx: Add window size options for HTTP/3 connection
2021-08-27 21:02:45 +09:00
fb8ff7b892
nghttpx: Format duration for frontend-quic-idle-timeout default value
2021-08-27 19:52:24 +09:00
5aeae7444f
nghttpx: Add --frontend-quic-debug-log option
2021-08-27 19:16:25 +09:00
c9b11e9fbf
nghttpx: Rename --quic-idle-timeout to --frontend-quic-idle-timeout
2021-08-27 19:03:06 +09:00
0005efa508
nghttpx: --frontend-http3-read-timeout should be noop if HTTP/3 is disabled
2021-08-27 18:45:19 +09:00
6931cb9d65
nghttpx: Add --quic-idle-timeout option
2021-08-27 18:44:33 +09:00
c1bcf0f11a
nghttpx: Do not dump HTTP/3 header fields
2021-08-27 18:35:27 +09:00
717e7ae8b2
nghttpx: Add --frontend-http3-read-timeout option
...
Add --frontend-http3-read-timeout option. QUIC idle timeout option
will be added later.
2021-08-27 18:29:06 +09:00
bed00fb8e1
nghttpx: Use buf.size()
2021-08-27 18:20:17 +09:00
2010401b81
nghttpx: Send APPLICATION_CLOSE on app read timeout
2021-08-27 18:19:44 +09:00
80c9d46b70
Update doc
2021-08-26 22:10:02 +09:00
1517c77d9c
h2load: Do not use legacy QUIC transport_parameters code point
2021-08-26 21:34:49 +09:00
51bf79bb8c
nghttpx: Add --http2-altsvc option
2021-08-26 21:34:49 +09:00
d88eadff13
nghttpx: Make sure each quic frontend endpoint has a unique address
2021-08-26 21:34:49 +09:00
0d35e8e15e
nghttpx: Do not allow quic on UNIX domain socket for now
2021-08-26 21:34:49 +09:00
a0066a1ccf
nghttpx: Send NEW_TOKEN and very token from client
2021-08-26 21:34:49 +09:00
7a5082e8c4
nghttpx: Clean up confusing dcid/scid mixup
2021-08-26 21:34:49 +09:00
dfc345756c
nghttpx: Send Retry packet
2021-08-26 21:34:49 +09:00
137da6adf6
nghttpx: Generate and set QUIC secrets
2021-08-26 21:34:49 +09:00
8563ec5a7a
nghttpx: Add options to specify eBPF program file path and disable eBPF
2021-08-26 21:34:49 +09:00
8ac4bee3bc
nghttpx: Add eBPF program to steer QUIC datagram to a correct socket
2021-08-26 21:34:49 +09:00
579fb478b5
nghttpx: Fix heap-use-after-free on initialization failure
2021-08-26 13:26:37 +09:00
33c580ebbf
Forward QUIC packet to the correct worker
2021-08-23 22:21:48 +09:00
29694e2945
nghttpx: Fix build error regarding RAND_bytes
2021-08-22 23:54:29 +09:00
9fe08d3913
nghttpx: Fix build without mruby
2021-08-22 23:54:29 +09:00
c07a0d9005
Allow HTTP/3 in cmake build
2021-08-22 23:54:29 +09:00
cbd45478e0
Cleanup flags/libs order
2021-08-22 23:54:29 +09:00
6f243108e9
nghttpx: Fix CI build error
2021-08-22 23:54:29 +09:00
102d960106
nghttpx: Compile without UDP_SEGMENT
2021-08-22 23:54:29 +09:00
4eced8a393
Build without HTTP/3 support
2021-08-22 23:54:29 +09:00
f46984d218
nghttpx: Enable QUIC 0RTT
2021-08-21 18:34:08 +09:00
44663a7e6e
nghttpx: Handle backend reset and early response
2021-08-21 18:34:08 +09:00
446124f378
nghttpx: Process request body
2021-08-21 18:34:08 +09:00
c45f2085d5
nghttpx: Fix veccnt assertion
2021-08-21 18:34:08 +09:00
3abf62b41a
nghttpx: Send stateless reset token in TP
2021-08-21 18:34:08 +09:00
9b2982510e
nghttpx: Send stateless reset
2021-08-21 18:34:08 +09:00
48bb1ebe01
nghttpx: Add configuration to enable ngtcp2 logging (no cmd-line opt yet)
2021-08-21 18:34:08 +09:00
fe4c6e4c56
nghttpx: Generate stateless reset secret
2021-08-21 18:34:08 +09:00
37bd9ffc48
nghttpx: Implement http_reset_stream and http_send_stop_sending
2021-08-21 18:34:08 +09:00
b0548b4944
nghttpx: Complete HTTP request and response
2021-08-21 18:34:08 +09:00
12425556c1
nghttpx: Extend Downstream stream_id to 64 bits
2021-08-21 18:34:07 +09:00
3ed2da562b
nghttpx: Add HTTP3 skeleton and minor SSL_CTX fix
2021-08-21 18:34:07 +09:00
354f46d8c5
nghttpx: Add QUIC timeouts
2021-08-21 18:34:07 +09:00
e70f0db83c
nghttpx: QUIC handshake now works
2021-08-21 18:34:07 +09:00
49b8c56fde
nghttpx: Use existing QUIC error object
2021-08-21 18:34:07 +09:00
940fdd5573
nghttpx: Read quic packet
2021-08-21 18:34:04 +09:00
ef53db201e
nghttpx: Create QUIC SSL_CTX
...
We choose an easier route to duplicate SSL_CTX for QUIC.
2021-08-21 18:33:39 +09:00
aeb0b0728d
nghttpx: Add QUICConnectionHandler and HTTP3Upstream skeleton
2021-08-21 18:33:39 +09:00
8b2746abf1
nghttpx: Add QUICListener
2021-08-21 18:33:39 +09:00
01da060496
nghttpx: Create quic server socket
2021-08-21 18:33:39 +09:00
20cbd269c4
Compile with the latest ngtcp2
2021-08-21 18:33:39 +09:00
7c2cd43dfa
Compile with the latest ngtcp2 and nghttp3
2021-08-21 18:33:39 +09:00
de5feff720
Compile with the latest nghttp3
2021-08-21 18:33:39 +09:00
7342de837d
Compile with the latest ngtcp2
2021-08-21 18:33:39 +09:00
e914b50d16
Compile with the latest ngtcp2
2021-08-21 18:33:39 +09:00
f79554f918
Count outgoing packets
2021-08-21 18:33:39 +09:00
213cc9c4b5
Enlarge receive buffer
2021-08-21 18:33:39 +09:00
05f3b8fa0f
Adopt ngtcp2_crypto_recv_crypto_data_cb
2021-08-21 18:33:39 +09:00
bc53624133
Do not specify max_udp_payload_size for now
2021-08-21 18:33:39 +09:00
5944d034da
Avoid std::ostringstream
2021-08-21 18:33:39 +09:00
df400feb61
make clang-format
2021-08-21 18:33:39 +09:00
48e10c57da
h2load: Add qlog output support
2021-08-21 18:33:39 +09:00
1eb818b64c
QUIC UDP GSO
2021-08-21 18:33:39 +09:00
e584d9cd2e
Measure the number of UDP datagrams sent and received
2021-08-21 18:33:39 +09:00
09a2e50fc2
Support both h3 and h3-29 ALPN and their corresponding QUIC versions
2021-08-21 18:33:39 +09:00
35d8ef33ef
Compile with the latest ngtcp2
2021-08-21 18:33:39 +09:00
f1ff2af47a
Deal with 0 length HTTP data write case
2021-08-21 18:33:39 +09:00
d2d2c31ec7
Follow ngtcp2_conn_writev_stream specification change
2021-08-21 18:33:39 +09:00
95102c1c6c
Compile with the latest ngtcp2
2021-08-21 18:33:39 +09:00
fa8c16ae01
Compile with the latest ngtcp2 and nghttp3
2021-08-21 18:33:39 +09:00
7ca2a8213d
h2load: Enable --data for HTTP/3
2021-08-21 18:33:39 +09:00
1c8e5046e5
Compile with the latest ngtcp2
2021-08-21 18:33:39 +09:00
6b4be30c64
Cap --window-bits to 26 for QUIC
2021-08-21 18:33:39 +09:00
6ce952ad4a
Set X25519 as default
2021-08-21 18:33:39 +09:00
5ae62dd9d7
Cap --window-bits to 23 for QUIC
2021-08-21 18:33:39 +09:00
51987107a2
Compile with the latest ngtcp2
2021-08-21 18:33:39 +09:00
e4a8c4813c
Compile with the latest ngtcp2
2021-08-21 18:33:39 +09:00
3d708f7dc4
Compile with the latest ngtcp2
2021-08-21 18:33:39 +09:00
10ec8c9558
Compile with the latest ngtcp2
2021-08-21 18:33:38 +09:00
3900f758ea
QUIC needs termination without session
2021-08-21 18:33:38 +09:00
a3346fbad8
Compile with latest ngtcp2
2021-08-21 18:33:38 +09:00
813d5e1ddf
Compile with latest ngtcp2
2021-08-21 18:33:38 +09:00
acb661df72
Fix bug for platform which does not have SOCK_NONBLOCK
2021-08-21 18:33:38 +09:00
4bc7710de9
Fix compile error
2021-08-21 18:33:38 +09:00
b8c1f4f138
Compile with latest ngtcp2
2021-08-21 18:33:38 +09:00
387b67472c
Compile latest ngtcp2 crypto lib
2021-08-21 18:33:38 +09:00
b2c099bac6
Use ngtcp2_conn_handle_expiry
2021-08-21 18:33:38 +09:00
1acebb1cc4
draft-28
2021-08-21 18:33:38 +09:00
8d89a8dcb0
Assert ndatalen
2021-08-21 18:33:38 +09:00
a60a34331b
Revert "Ensure complete packet is written"
...
This reverts commit c19046b09f8e66713f0e067f986ed92d676eb6b6.
2021-08-21 18:33:38 +09:00
749015eb86
Ensure complete packet is written
2021-08-21 18:33:38 +09:00
4b45142e72
Fix compile error with the latest ngtcp2
2021-08-21 18:33:38 +09:00
2722119776
Handle stream limit increment
2021-08-21 18:33:38 +09:00
0b61e46f95
draft-25
2021-08-21 18:33:38 +09:00
5c0da486b9
Remove unused member function declaration
2021-08-21 18:33:38 +09:00
9701e5e6e4
Fix compile error
2021-08-21 18:33:38 +09:00
a93eb8b8f5
Optimize QUIC write
2021-08-21 18:33:38 +09:00
c591ab5e6f
Only count STREAM data as bytes_total
2021-08-21 18:33:38 +09:00
b3fbebed55
Use correct type
2021-08-21 18:33:38 +09:00
4621f88441
Follow ngtcp2 API update
2021-08-21 18:33:38 +09:00
747edb3a99
quic draft-24
2021-08-21 18:33:38 +09:00
73fd20a608
Add SSLKEYLOGFILE support
2021-08-21 18:33:38 +09:00
78c2c33b9e
Compile with the latest ngtcp2
2021-08-21 18:33:38 +09:00
610add1f59
Send SNI
2021-08-21 18:33:38 +09:00
f7414700f4
Small adjustment of successful HTTP/3 error code
...
Non-zero successful error code is a bit annoying because ngtcp2 does
not know it. Enforcing successful application error code to 0 is a
lot simpler.
2021-08-21 18:33:38 +09:00
53a860a5bf
Simplify write_quic
2021-08-21 18:33:38 +09:00
1aae450303
Handle sending just fine
2021-08-21 18:33:38 +09:00
b3a2f8837c
Avoid setting 0 to repeat field
2021-08-21 18:33:38 +09:00
33d2a93294
Add missing acked_stream_data_offset callback
2021-08-21 18:33:38 +09:00
2da0db70de
Fix return value
2021-08-21 18:33:38 +09:00
ff7067f3a3
Compile with the latest ngtcp2 and ngtcp2_crypto_openssl
2021-08-21 18:33:38 +09:00
6b8b152444
Remove error handling which does not happen
2021-08-21 18:33:38 +09:00
3dbe3b3e7f
Follow ngtcp2 API changes and use libngtcp2_crypto_openssl
2021-08-21 18:33:38 +09:00
7aa4bff97b
quic: Support TLS_AES_128_CCM_SHA256
2021-08-21 18:33:38 +09:00
6002fac9f1
h2load: Add --tls13-ciphers option
2021-08-21 18:33:38 +09:00
c3eb7e1634
Handle preferred address
2021-08-21 18:33:38 +09:00
05a6ee2b49
Show ngtcp2 debug log with --verbose
2021-08-21 18:33:38 +09:00
94d76c042d
h2load: Add --groups option
2021-08-21 18:33:38 +09:00
23ccaa6191
Always call write_quic when timer expires
2021-08-21 18:33:38 +09:00
476e9d0a48
h3-22
2021-08-21 18:33:38 +09:00
7cd5ed6fc6
Handle Retry
2021-08-21 18:33:38 +09:00
750c23f319
quic: Configure settings with options
2021-08-21 18:33:38 +09:00
bb36df8b2e
h2load: Fix possible deadlock
2021-08-21 18:33:38 +09:00
9c748d20d5
[WIP] Add QUIC to h2load
2021-08-21 18:33:38 +09:00
80c9c705b8
Merge pull request #1607 from nghttp2/dnf
...
Add "dnf" (= "do not forward") parameter to backend option
2021-08-14 17:35:20 +09:00
138419d232
Add "dnf" (= "do not forward") parameter to backend option
2021-08-14 17:16:21 +09:00
c2d4a53b67
Fix prototype mismatch for function 'file_read_callback'
...
Summary:
The [data_flags](https://github.com/lhuang04/nghttp2/blob/master/src/HttpServer.cc#L1078 ) is defined as `uint32_t*` in definition, but delared as [int*](https://github.com/lhuang04/nghttp2/blob/master/src/HttpServer.h#L245 ) in the prototype.
```
stderr: error: no previous prototype for function 'file_read_callback' [-Werror,-Wmissing-prototypes]
ssize_t file_read_callback(nghttp2_session *session, int32_t stream_id,
^
```
Test Plan:
Reviewers:
Subscribers:
Tasks:
Tags:
2021-08-07 07:24:21 -07:00
29cbf8b83f
clang-format-12
2021-08-04 15:04:58 +09:00
fa16e66a6d
nghttpx: Fix max distance in weight group/address cycle comparison
2021-07-14 23:26:33 +09:00
40af31da4c
nghttpx: Set connect_blocker and live_check after shuffling addresses
2021-07-14 23:09:28 +09:00
43a47aa08b
Do not return HPE_USER from where it is prohibited
2021-05-13 13:59:44 +09:00
cef458c31c
Replace black-list with block-list
...
nghttpx --no-http2-cipher-black-list and
--client-no-http2-cipher-black-list are deprecated and replaced with
--no-http2-cipher-block-list and --client-no-http2-cipher-block-list
respectively.
2021-04-02 22:35:37 +09:00
617a5766a2
Replace master with main
2021-04-02 22:08:19 +09:00
f1d6733554
Initialize Config rps field
2021-03-10 13:45:20 +09:00
5f3bcb1f58
Add precious variables for libev and jemalloc and use JEMALLOC_CFLAGS
2021-03-06 22:32:17 +09:00
e406a2c15e
Update doc
2021-02-23 17:41:27 +09:00
6cdc13d6c6
h2load: Add --rps option
2021-02-23 16:40:17 +09:00
92944f7847
h2load: Allow unit in -D option
2021-02-23 15:31:54 +09:00
276792a812
Remove unnecessary function
...
on_stream_close is called after on_frame_not_send_callback with
success=false without this function.
2021-02-23 14:32:43 +09:00
2f2b211766
Add LIBTOOL_LDFLAGS configure variable
2021-02-21 21:32:48 +09:00
40679cf638
Merge pull request #1553 from nghttp2/nghttpx-fix-accesslog-method
...
nghttpx: Remove trailing white space after $method log variable
2021-02-08 23:02:19 +09:00
50a1121d81
nghttpx: Remove trailing white space after $method log variable
2021-02-08 22:22:05 +09:00
5b9892a902
docs: asio: fix some typos
...
Really just a s/pusedo/pseudo/g and s/exluced/excluded/g.
2021-01-15 00:39:39 +01:00
d32e20bcaa
nghttpx: Make sure that Pool gets cleared when all buffers are returned
2020-12-16 23:27:58 +09:00
81fb015391
nghttpx: Choose ECDSA cert if compatible signature algorithm available
2020-12-13 23:40:43 +09:00
6787423edc
nghttpx: Add workaround to include ':' in backend pattern
2020-11-27 22:15:46 +09:00
da7959c2e8
nghttpx: Deal with the case when h2 backend is retired before it is initialized
2020-11-15 11:19:07 +09:00
4e3c61ef4d
nghttpx: Add accesslog variables to record request path without query
...
This commit the following variables to construct request line without
including query component:
* $method
* $path
* $path_without_query
* $protocol_version
2020-09-19 23:58:37 +09:00
7b4de401d2
nghttpx: Check worker wide blocker before creating new downstream connection
2020-09-19 23:22:14 +09:00
7df73a5d90
nghttpx: mrb_run was removed
2020-09-02 22:12:45 +09:00
d5550e946d
Amend f1d8547b29
...
Better handling of tls and early data buffer
2020-07-14 19:47:08 +09:00
62411f5a6e
nghttpx: Set client_handler to special frontend objects
2020-07-14 01:13:29 +09:00
e9465f0ee5
Revert "nghttpx: Fix ubsan error"
...
This reverts commit 14dfeee4ed
2020-07-14 01:13:29 +09:00
14dfeee4ed
nghttpx: Fix ubsan error
2020-07-14 00:12:07 +09:00
f1d8547b29
nghttpx: Fix stall when TLS follows after proxy protocol
...
This fixes that nghttpx stalls when TLS handshake and data follow
after proxy protocol header and no extra read notification is
triggered (e.g., just small 1 HTTP request).
2020-07-13 23:39:17 +09:00
abe80e371e
nghttpx: Fix logging integer
2020-06-10 20:56:33 +09:00
854e9fe395
nghttpx: Always call init_forwarded_for
...
Always call init_forwarded_for to get the default when source address
in PROXY protocol is ignored. This ensures that forwarded header
field has the same value as x-forwarded-for.
2020-04-18 17:16:45 +09:00
49cd8e6e73
nghttpx: Add PROXY-protocol v2 support
2020-04-18 17:16:30 +09:00
4922bb41d6
static_cast size parameter in StringRef constructor to size_t
2020-03-31 00:54:08 -07:00
aad8697575
Fix get_x509_serial for long serial numbers
2020-03-31 00:19:06 -07:00
5e13274b7c
Fix typo
2019-12-21 11:39:05 +09:00
e0d7f7de5e
h2load: Allow port in --connect-to
2019-12-21 11:39:05 +09:00
df575f968f
h2load: add --connect-to option
2019-12-21 11:39:05 +09:00
29042f1c95
priority_spec::valid(): remove const qualifier from return value
...
gcc generates warning:
* type qualifiers ignored on function return type [-Wignored-qualifiers]
2019-10-29 11:28:26 +01:00
6f967c6ef3
Fix errors reported by coverity scan
2019-09-21 13:45:20 +09:00
fe8946ddc7
nghttpx: Fix bug that mruby is incorrectly shared between backends
...
Previously, mruby context is wrongly shared by multiple patterns if
the underlying SharedDownstreamAddr is shared by multiple
DownstreamAddrGroups. This commit fixes it.
2019-09-16 22:25:06 +09:00
f8933fe504
nghttpx: Reconnect h1 backend if it lost connection before sending headers
...
This is the second attempt. The first attempt was
8a59ce6d37
2019-09-07 18:20:24 +09:00
5080db84e2
Revert "nghttpx: Reconnect h1 backend if it lost connection before sending headers"
...
This reverts commit 8a59ce6d37
2019-09-06 22:01:03 +09:00
053c7ac588
nghttpx: Returns 408 if backend timed out before sending headers
2019-09-03 00:29:01 +09:00
8a59ce6d37
nghttpx: Reconnect h1 backend if it lost connection before sending headers
2019-09-03 00:28:21 +09:00
f2fde180cd
Remove redundant null check before delete
...
Reported in https://github.com/nghttp2/nghttp2/issues/1384
2019-08-19 22:27:32 +09:00
95efb3e19d
Don't read too greedily
2019-08-14 11:44:28 +09:00
319d5ab1c6
nghttpx: Fix request stall
...
Fix request stall if backend connection is reused and buffer is full.
2019-08-06 20:50:29 +09:00
4f7aedc9d2
cmake: Support building nghttpx with systemd
2019-07-29 13:55:05 +03:00
7a5908933e
Fix clang-8 warning
2019-06-22 17:44:16 +09:00
ee44313445
Fix FPE with default backend
2019-06-11 23:15:01 +09:00
abef9b90ef
Fix log-level is not set with cmd-line or configuration file
2019-06-11 23:13:43 +09:00
b7220f075c
cmake: Remove SPDY related files
2019-06-08 00:23:17 +09:00
77f1c872b1
nghttpx: Fix unchanged log level on configuration reload
...
Previously, if log-level is not mentioned in configuration file and
reload happens, the log level was not set to the default value NOTICE.
Instead, the log level stayed the same. This commit fixes this bug.
2019-06-05 21:17:23 +09:00
b0f5e5cc79
Implement daemon() using fork() for OSX
2019-05-30 23:22:44 +09:00
2e1975ddf6
clang-format-8
2019-05-18 10:28:35 +09:00
4fca2502d8
nghttpx: Ignore Content-Length and Transfer-Encoding in 1xx or 200 to CONNECT
...
A well known server sends content-length: 0 in 101 response. RFC 7230
says Content-Length or Transfer-Encoding in 200 response to CONNECT
request: https://tools.ietf.org/html/rfc7230#section-3.3.3
2019-05-17 22:58:26 +09:00
0288093caf
Fix llhttp_get_error_pos usage
...
It returns NULL if return value is HPE_OK.
2019-04-21 00:07:11 +09:00
c64d2573dc
Replace http-parser with llhttp
...
llhttp does not include URL parser. We extracted URL parser code from
http-parser and put it under third-party/url-parser.
llhttp bd3d224eb8cdc92c6fc8f508d7bbe0ba266e8e92
2019-04-20 18:42:30 +09:00
f028cc4392
clang-format
2019-04-18 23:37:48 +09:00
cbba1ebf8f
asio: support boost-1.70
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In boost 1.70, deprecated get_io_context() has finally been removed.
Introduce GET_IO_SERVICE macro that based on boost version uses
old get_io_service() interface (boost < 1.70), or get_executor().context()
for boost 1.70+.
Commit based idea seen in monero-project/monero@17769db946
2019-04-18 12:35:54 +02:00
a35059e3f1
nghttpx: Fix bug that altered authority and path affect backend selection
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Fix bug that altered authority and path by per-pattern mruby script
affect backend selection on retry.
2019-04-16 22:18:30 +09:00
5a30fafdda
Merge branch 'nghttpx-fix-chunked-request-stall'
2019-04-16 00:26:18 +09:00
2cff8b43cf
nghttpx: Fix bug that chunked request stalls
2019-04-15 23:58:30 +09:00
be96654d56
nghttpx: Don't log authorization request header field value with -LINFO
2019-04-15 22:59:26 +09:00
ec519f22dc
Merge pull request #1270 from baitisj/master
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Fix for compilation against modern LibreSSL
2019-03-13 20:52:50 +09:00
371bc3a8f7
clang-format
2019-03-08 00:19:34 +09:00
f5feb16ef4
Merge pull request #1295 from bratkartoffel/fix-compile-boringssl
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Fix compilation with boringssl
2019-02-20 00:13:00 +09:00
Tatsuhiro Tsujikawa
Hajime Fujita
Lucas Pardue
Tatsuhiro Tsujikawa
lhuang04
Jan Kundrát
Jacky Tian
lucas
Richard Wolfert
Andrew Penkrat
Adam Gołębiowski