Commit | Line | Data |
---|---|---|
58eb9381 | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com> |
3 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> | |
4 | * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
58eb9381 | 5 | * |
ab5be9fa | 6 | * SPDX-License-Identifier: GPL-2.0-only |
58eb9381 | 7 | * |
58eb9381 DG |
8 | */ |
9 | ||
6c1c0768 | 10 | #define _LGPL_SOURCE |
c9e313bc SM |
11 | #include "connection.hpp" |
12 | #include "stream.hpp" | |
13 | #include "viewer-session.hpp" | |
58eb9381 | 14 | |
28ab034a | 15 | #include <common/common.hpp> |
56047f5a | 16 | #include <common/urcu.hpp> |
28ab034a JG |
17 | |
18 | #include <urcu/rculist.h> | |
19 | ||
7591bab1 | 20 | bool connection_get(struct relay_connection *conn) |
58eb9381 | 21 | { |
ce4d4083 | 22 | return urcu_ref_get_unless_zero(&conn->ref); |
58eb9381 DG |
23 | } |
24 | ||
28ab034a | 25 | struct relay_connection *connection_get_by_sock(struct lttng_ht *relay_connections_ht, int sock) |
58eb9381 DG |
26 | { |
27 | struct lttng_ht_node_ulong *node; | |
28 | struct lttng_ht_iter iter; | |
cd9adb8b | 29 | struct relay_connection *conn = nullptr; |
58eb9381 | 30 | |
a0377dfe | 31 | LTTNG_ASSERT(sock >= 0); |
58eb9381 | 32 | |
56047f5a | 33 | lttng::urcu::read_lock_guard read_lock; |
28ab034a | 34 | lttng_ht_lookup(relay_connections_ht, (void *) ((unsigned long) sock), &iter); |
58eb9381 DG |
35 | node = lttng_ht_iter_get_node_ulong(&iter); |
36 | if (!node) { | |
37 | DBG2("Relay connection by sock %d not found", sock); | |
38 | goto end; | |
39 | } | |
0114db0e | 40 | conn = lttng::utils::container_of(node, &relay_connection::sock_n); |
7591bab1 | 41 | if (!connection_get(conn)) { |
cd9adb8b | 42 | conn = nullptr; |
7591bab1 | 43 | } |
58eb9381 DG |
44 | end: |
45 | return conn; | |
46 | } | |
47 | ||
5312a3ed JG |
48 | int connection_reset_protocol_state(struct relay_connection *connection) |
49 | { | |
50 | int ret = 0; | |
51 | ||
52 | switch (connection->type) { | |
53 | case RELAY_DATA: | |
28ab034a | 54 | connection->protocol.data.state_id = DATA_CONNECTION_STATE_RECEIVE_HEADER; |
5312a3ed | 55 | memset(&connection->protocol.data.state.receive_header, |
28ab034a JG |
56 | 0, |
57 | sizeof(connection->protocol.data.state.receive_header)); | |
5312a3ed | 58 | connection->protocol.data.state.receive_header.left_to_receive = |
28ab034a | 59 | sizeof(struct lttcomm_relayd_data_hdr); |
5312a3ed JG |
60 | break; |
61 | case RELAY_CONTROL: | |
28ab034a | 62 | connection->protocol.ctrl.state_id = CTRL_CONNECTION_STATE_RECEIVE_HEADER; |
5312a3ed | 63 | memset(&connection->protocol.ctrl.state.receive_header, |
28ab034a JG |
64 | 0, |
65 | sizeof(connection->protocol.ctrl.state.receive_header)); | |
5312a3ed | 66 | connection->protocol.data.state.receive_header.left_to_receive = |
28ab034a JG |
67 | sizeof(struct lttcomm_relayd_hdr); |
68 | ret = lttng_dynamic_buffer_set_size(&connection->protocol.ctrl.reception_buffer, | |
69 | sizeof(struct lttcomm_relayd_hdr)); | |
5312a3ed | 70 | if (ret) { |
28ab034a JG |
71 | ERR("Failed to reinitialize control connection reception buffer size to %zu bytes.", |
72 | sizeof(struct lttcomm_relayd_hdr)); | |
5312a3ed JG |
73 | goto end; |
74 | } | |
75 | break; | |
76 | default: | |
77 | goto end; | |
78 | } | |
28ab034a | 79 | DBG("Reset communication state of relay connection (fd = %i)", connection->sock->fd); |
5312a3ed JG |
80 | end: |
81 | return ret; | |
82 | } | |
83 | ||
28ab034a | 84 | struct relay_connection *connection_create(struct lttcomm_sock *sock, enum connection_type type) |
58eb9381 | 85 | { |
7591bab1 | 86 | struct relay_connection *conn; |
58eb9381 | 87 | |
64803277 | 88 | conn = zmalloc<relay_connection>(); |
7591bab1 MD |
89 | if (!conn) { |
90 | PERROR("zmalloc relay connection"); | |
91 | goto end; | |
92 | } | |
7591bab1 MD |
93 | urcu_ref_init(&conn->ref); |
94 | conn->type = type; | |
95 | conn->sock = sock; | |
96 | lttng_ht_node_init_ulong(&conn->sock_n, (unsigned long) conn->sock->fd); | |
5312a3ed JG |
97 | if (conn->type == RELAY_CONTROL) { |
98 | lttng_dynamic_buffer_init(&conn->protocol.ctrl.reception_buffer); | |
99 | } | |
100 | connection_reset_protocol_state(conn); | |
7591bab1 MD |
101 | end: |
102 | return conn; | |
58eb9381 DG |
103 | } |
104 | ||
7591bab1 | 105 | static void rcu_free_connection(struct rcu_head *head) |
58eb9381 | 106 | { |
7591bab1 | 107 | struct relay_connection *conn = |
0114db0e | 108 | lttng::utils::container_of(head, &relay_connection::rcu_node); |
58eb9381 | 109 | |
7591bab1 MD |
110 | lttcomm_destroy_sock(conn->sock); |
111 | if (conn->viewer_session) { | |
112 | viewer_session_destroy(conn->viewer_session); | |
cd9adb8b | 113 | conn->viewer_session = nullptr; |
7591bab1 | 114 | } |
35be817a | 115 | if (conn->type == RELAY_CONTROL) { |
28ab034a | 116 | lttng_dynamic_buffer_reset(&conn->protocol.ctrl.reception_buffer); |
35be817a | 117 | } |
7591bab1 MD |
118 | free(conn); |
119 | } | |
120 | ||
121 | static void destroy_connection(struct relay_connection *conn) | |
122 | { | |
58eb9381 DG |
123 | call_rcu(&conn->rcu_node, rcu_free_connection); |
124 | } | |
125 | ||
7591bab1 | 126 | static void connection_release(struct urcu_ref *ref) |
58eb9381 | 127 | { |
28ab034a | 128 | struct relay_connection *conn = lttng::utils::container_of(ref, &relay_connection::ref); |
58eb9381 | 129 | |
7591bab1 MD |
130 | if (conn->in_socket_ht) { |
131 | struct lttng_ht_iter iter; | |
132 | int ret; | |
133 | ||
134 | iter.iter.node = &conn->sock_n.node; | |
135 | ret = lttng_ht_del(conn->socket_ht, &iter); | |
a0377dfe | 136 | LTTNG_ASSERT(!ret); |
58eb9381 DG |
137 | } |
138 | ||
7591bab1 MD |
139 | if (conn->session) { |
140 | if (session_close(conn->session)) { | |
141 | ERR("session_close"); | |
142 | } | |
cd9adb8b | 143 | conn->session = nullptr; |
7591bab1 MD |
144 | } |
145 | if (conn->viewer_session) { | |
146 | viewer_session_close(conn->viewer_session); | |
147 | } | |
148 | destroy_connection(conn); | |
58eb9381 DG |
149 | } |
150 | ||
7591bab1 | 151 | void connection_put(struct relay_connection *conn) |
58eb9381 | 152 | { |
56047f5a | 153 | lttng::urcu::read_lock_guard read_lock; |
7591bab1 | 154 | urcu_ref_put(&conn->ref, connection_release); |
58eb9381 DG |
155 | } |
156 | ||
28ab034a | 157 | void connection_ht_add(struct lttng_ht *relay_connections_ht, struct relay_connection *conn) |
58eb9381 | 158 | { |
a0377dfe | 159 | LTTNG_ASSERT(!conn->in_socket_ht); |
7591bab1 | 160 | lttng_ht_add_unique_ulong(relay_connections_ht, &conn->sock_n); |
cd9adb8b | 161 | conn->in_socket_ht = true; |
7591bab1 | 162 | conn->socket_ht = relay_connections_ht; |
58eb9381 | 163 | } |
fd0f1e3e | 164 | |
28ab034a | 165 | int connection_set_session(struct relay_connection *conn, struct relay_session *session) |
fd0f1e3e JR |
166 | { |
167 | int ret = 0; | |
168 | ||
a0377dfe FD |
169 | LTTNG_ASSERT(conn); |
170 | LTTNG_ASSERT(session); | |
171 | LTTNG_ASSERT(!conn->session); | |
fd0f1e3e JR |
172 | |
173 | if (connection_get(conn)) { | |
174 | if (session_get(session)) { | |
175 | conn->session = session; | |
176 | } else { | |
177 | ERR("Failed to get session reference in connection_set_session()"); | |
178 | ret = -1; | |
179 | } | |
180 | connection_put(conn); | |
181 | } else { | |
182 | ERR("Failed to get connection reference in connection_set_session()"); | |
183 | ret = -1; | |
184 | } | |
185 | return ret; | |
186 | } |