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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:24:08 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:24:08 +0000 |
commit | f449f278dd3c70e479a035f50a9bb817a9b433ba (patch) | |
tree | 8ca2bfb785dda9bb4d573acdf9b42aea9cd51383 /src/contrib/libngtcp2/ngtcp2/lib/ngtcp2_pmtud.h | |
parent | Initial commit. (diff) | |
download | knot-upstream/3.2.6.tar.xz knot-upstream/3.2.6.zip |
Adding upstream version 3.2.6.upstream/3.2.6upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/contrib/libngtcp2/ngtcp2/lib/ngtcp2_pmtud.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/src/contrib/libngtcp2/ngtcp2/lib/ngtcp2_pmtud.h b/src/contrib/libngtcp2/ngtcp2/lib/ngtcp2_pmtud.h new file mode 100644 index 0000000..6b2e691 --- /dev/null +++ b/src/contrib/libngtcp2/ngtcp2/lib/ngtcp2_pmtud.h @@ -0,0 +1,123 @@ +/* + * ngtcp2 + * + * Copyright (c) 2022 ngtcp2 contributors + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ +#ifndef NGTCP2_PMTUD_H +#define NGTCP2_PMTUD_H + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif /* HAVE_CONFIG_H */ + +#include <ngtcp2/ngtcp2.h> + +typedef struct ngtcp2_pmtud { + const ngtcp2_mem *mem; + /* mtu_idx is the index of UDP payload size candidates to try + out. */ + size_t mtu_idx; + /* num_pkts_sent is the number of mtu_idx sized UDP datagram payload + sent */ + size_t num_pkts_sent; + /* expiry is the expired, if it is reached, send out the next UDP + datagram. UINT64_MAX means no expiry, or expiration is canceled. + In either case, new probe packet should be sent unless we have + done all attempts. */ + ngtcp2_tstamp expiry; + /* tx_pkt_num is the smallest outgoing packet number where the + current discovery is performed. In other words, acknowledging + packet whose packet number lower than that does not indicate the + success of Path MTU Discovery. */ + int64_t tx_pkt_num; + /* max_udp_payload_size is the maximum UDP payload size which is + known to work. */ + size_t max_udp_payload_size; + /* hard_max_udp_payload_size is the maximum UDP payload size that is + going to be probed. */ + size_t hard_max_udp_payload_size; + /* min_fail_udp_payload_size is the minimum UDP payload size that is + known to fail. */ + size_t min_fail_udp_payload_size; +} ngtcp2_pmtud; + +/* + * ngtcp2_pmtud_new creates new ngtcp2_pmtud object, and assigns its + * pointer to |*ppmtud|. |max_udp_payload_size| is the maximum UDP + * payload size that is known to work for the current path. + * |tx_pkt_num| should be the next packet number to send, which is + * used to differentiate the PMTUD probe packet sent by the previous + * PMTUD. PMTUD might finish immediately if |max_udp_payload_size| is + * larger than or equal to all UDP payload probe candidates. + * Therefore, call ngtcp2_pmtud_finished to check this situation. + * + * This function returns 0 if it succeeds, or one of the following + * negative error codes: + * + * NGTCP2_ERR_NOMEM + * Out of memory. + */ +int ngtcp2_pmtud_new(ngtcp2_pmtud **ppmtud, size_t max_udp_payload_size, + size_t hard_max_udp_payload_size, int64_t tx_pkt_num, + const ngtcp2_mem *mem); + +/* + * ngtcp2_pmtud_del deletes |pmtud|. + */ +void ngtcp2_pmtud_del(ngtcp2_pmtud *pmtud); + +/* + * ngtcp2_pmtud_probelen returns the length of UDP payload size for a + * PMTUD probe packet. + */ +size_t ngtcp2_pmtud_probelen(ngtcp2_pmtud *pmtud); + +/* + * ngtcp2_pmtud_probe_sent should be invoked when a PMTUD probe packet is + * sent. + */ +void ngtcp2_pmtud_probe_sent(ngtcp2_pmtud *pmtud, ngtcp2_duration pto, + ngtcp2_tstamp ts); + +/* + * ngtcp2_pmtud_require_probe returns nonzero if a PMTUD probe packet + * should be sent. + */ +int ngtcp2_pmtud_require_probe(ngtcp2_pmtud *pmtud); + +/* + * ngtcp2_pmtud_probe_success should be invoked when a PMTUD probe + * UDP datagram sized |payloadlen| is acknowledged. + */ +void ngtcp2_pmtud_probe_success(ngtcp2_pmtud *pmtud, size_t payloadlen); + +/* + * ngtcp2_pmtud_handle_expiry handles expiry. + */ +void ngtcp2_pmtud_handle_expiry(ngtcp2_pmtud *pmtud, ngtcp2_tstamp ts); + +/* + * ngtcp2_pmtud_finished returns nonzero if PMTUD has finished. + */ +int ngtcp2_pmtud_finished(ngtcp2_pmtud *pmtud); + +#endif /* NGTCP2_PMTUD_H */ |