Willy Tarreau | 62f5269 | 2017-10-08 23:01:42 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * HTTP/2 mux-demux for connections |
| 3 | * |
| 4 | * Copyright 2017 Willy Tarreau <w@1wt.eu> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <common/cfgparse.h> |
| 14 | #include <common/config.h> |
| 15 | #include <proto/connection.h> |
| 16 | #include <proto/stream.h> |
| 17 | |
| 18 | |
| 19 | /*****************************************************************/ |
| 20 | /* functions below are dedicated to the mux setup and management */ |
| 21 | /*****************************************************************/ |
| 22 | |
| 23 | /* Initialize the mux once it's attached. For outgoing connections, the context |
| 24 | * is already initialized before installing the mux, so we detect incoming |
| 25 | * connections from the fact that the context is still NULL. Returns < 0 on |
| 26 | * error. |
| 27 | */ |
| 28 | static int h2_init(struct connection *conn) |
| 29 | { |
| 30 | if (conn->mux_ctx) { |
| 31 | /* we don't support outgoing connections for now */ |
| 32 | return -1; |
| 33 | } |
| 34 | |
| 35 | /* not implemented yet */ |
| 36 | return -1; |
| 37 | } |
| 38 | |
| 39 | /* release function for a connection. This one should be called to free all |
| 40 | * resources allocated to the mux. |
| 41 | */ |
| 42 | static void h2_release(struct connection *conn) |
| 43 | { |
| 44 | } |
| 45 | |
| 46 | |
| 47 | /*********************************************************/ |
| 48 | /* functions below are I/O callbacks from the connection */ |
| 49 | /*********************************************************/ |
| 50 | |
| 51 | /* callback called on recv event by the connection handler */ |
| 52 | static void h2_recv(struct connection *conn) |
| 53 | { |
| 54 | } |
| 55 | |
| 56 | /* callback called on send event by the connection handler */ |
| 57 | static void h2_send(struct connection *conn) |
| 58 | { |
| 59 | } |
| 60 | |
| 61 | /* callback called on any event by the connection handler. |
| 62 | * It applies changes and returns zero, or < 0 if it wants immediate |
| 63 | * destruction of the connection (which normally doesn not happen in h2). |
| 64 | */ |
| 65 | static int h2_wake(struct connection *conn) |
| 66 | { |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | /*******************************************/ |
| 71 | /* functions below are used by the streams */ |
| 72 | /*******************************************/ |
| 73 | |
| 74 | /* |
| 75 | * Attach a new stream to a connection |
| 76 | * (Used for outgoing connections) |
| 77 | */ |
| 78 | static struct conn_stream *h2_attach(struct connection *conn) |
| 79 | { |
| 80 | return NULL; |
| 81 | } |
| 82 | |
| 83 | /* callback used to update the mux's polling flags after changing a cs' status. |
| 84 | * The caller (cs_update_mux_polling) will take care of propagating any changes |
| 85 | * to the transport layer. |
| 86 | */ |
| 87 | static void h2_update_poll(struct conn_stream *cs) |
| 88 | { |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * Detach the stream from the connection and possibly release the connection. |
| 93 | */ |
| 94 | static void h2_detach(struct conn_stream *cs) |
| 95 | { |
| 96 | } |
| 97 | |
| 98 | static void h2_shutr(struct conn_stream *cs, enum cs_shr_mode mode) |
| 99 | { |
| 100 | } |
| 101 | |
| 102 | static void h2_shutw(struct conn_stream *cs, enum cs_shw_mode mode) |
| 103 | { |
| 104 | } |
| 105 | |
| 106 | /* |
| 107 | * Called from the upper layer, to get more data |
| 108 | */ |
| 109 | static int h2_rcv_buf(struct conn_stream *cs, struct buffer *buf, int count) |
| 110 | { |
| 111 | /* FIXME: not handled for now */ |
| 112 | cs->flags |= CS_FL_ERROR; |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | /* Called from the upper layer, to send data */ |
| 117 | static int h2_snd_buf(struct conn_stream *cs, struct buffer *buf, int flags) |
| 118 | { |
| 119 | /* FIXME: not handled for now */ |
| 120 | cs->flags |= CS_FL_ERROR; |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | |
| 125 | /*******************************************************/ |
| 126 | /* functions below are dedicated to the config parsers */ |
| 127 | /*******************************************************/ |
| 128 | |
| 129 | |
| 130 | |
| 131 | /****************************************/ |
| 132 | /* MUX initialization and instanciation */ |
| 133 | /***************************************/ |
| 134 | |
| 135 | /* The mux operations */ |
| 136 | const struct mux_ops h2_ops = { |
| 137 | .init = h2_init, |
| 138 | .recv = h2_recv, |
| 139 | .send = h2_send, |
| 140 | .wake = h2_wake, |
| 141 | .update_poll = h2_update_poll, |
| 142 | .rcv_buf = h2_rcv_buf, |
| 143 | .snd_buf = h2_snd_buf, |
| 144 | .attach = h2_attach, |
| 145 | .detach = h2_detach, |
| 146 | .shutr = h2_shutr, |
| 147 | .shutw = h2_shutw, |
| 148 | .release = h2_release, |
| 149 | .name = "H2", |
| 150 | }; |
| 151 | |
| 152 | /* ALPN selection : this mux registers ALPN tolen "h2" */ |
| 153 | static struct alpn_mux_list alpn_mux_h2 = |
| 154 | { .token = IST("h2"), .mode = ALPN_MODE_HTTP, .mux = &h2_ops }; |
| 155 | |
| 156 | /* config keyword parsers */ |
| 157 | static struct cfg_kw_list cfg_kws = {ILH, { |
| 158 | { 0, NULL, NULL } |
| 159 | }}; |
| 160 | |
| 161 | __attribute__((constructor)) |
| 162 | static void __h2_init(void) |
| 163 | { |
| 164 | alpn_register_mux(&alpn_mux_h2); |
| 165 | cfg_register_keywords(&cfg_kws); |
| 166 | } |