Move to kernel style SPDX license identifiers
[lttng-tools.git] / src / bin / lttng-relayd / connection.c
1 /*
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>
5 *
6 * SPDX-License-Identifier: GPL-2.0-only
7 *
8 */
9
10 #define _LGPL_SOURCE
11 #include <common/common.h>
12 #include <urcu/rculist.h>
13
14 #include "connection.h"
15 #include "stream.h"
16 #include "viewer-session.h"
17
18 bool connection_get(struct relay_connection *conn)
19 {
20 return urcu_ref_get_unless_zero(&conn->ref);
21 }
22
23 struct relay_connection *connection_get_by_sock(struct lttng_ht *relay_connections_ht,
24 int sock)
25 {
26 struct lttng_ht_node_ulong *node;
27 struct lttng_ht_iter iter;
28 struct relay_connection *conn = NULL;
29
30 assert(sock >= 0);
31
32 rcu_read_lock();
33 lttng_ht_lookup(relay_connections_ht, (void *)((unsigned long) sock),
34 &iter);
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 }
40 conn = caa_container_of(node, struct relay_connection, sock_n);
41 if (!connection_get(conn)) {
42 conn = NULL;
43 }
44 end:
45 rcu_read_unlock();
46 return conn;
47 }
48
49 int connection_reset_protocol_state(struct relay_connection *connection)
50 {
51 int ret = 0;
52
53 switch (connection->type) {
54 case RELAY_DATA:
55 connection->protocol.data.state_id =
56 DATA_CONNECTION_STATE_RECEIVE_HEADER;
57 memset(&connection->protocol.data.state.receive_header,
58 0,
59 sizeof(connection->protocol.data.state.receive_header));
60 connection->protocol.data.state.receive_header.left_to_receive =
61 sizeof(struct lttcomm_relayd_data_hdr);
62 break;
63 case RELAY_CONTROL:
64 connection->protocol.ctrl.state_id =
65 CTRL_CONNECTION_STATE_RECEIVE_HEADER;
66 memset(&connection->protocol.ctrl.state.receive_header,
67 0,
68 sizeof(connection->protocol.ctrl.state.receive_header));
69 connection->protocol.data.state.receive_header.left_to_receive =
70 sizeof(struct lttcomm_relayd_hdr);
71 ret = lttng_dynamic_buffer_set_size(
72 &connection->protocol.ctrl.reception_buffer,
73 sizeof(struct lttcomm_relayd_hdr));
74 if (ret) {
75 ERR("Failed to reinitialize control connection reception buffer size to %zu bytes.", sizeof(struct lttcomm_relayd_hdr));
76 goto end;
77 }
78 break;
79 default:
80 goto end;
81 }
82 DBG("Reset communication state of relay connection (fd = %i)",
83 connection->sock->fd);
84 end:
85 return ret;
86 }
87
88 struct relay_connection *connection_create(struct lttcomm_sock *sock,
89 enum connection_type type)
90 {
91 struct relay_connection *conn;
92
93 conn = zmalloc(sizeof(*conn));
94 if (!conn) {
95 PERROR("zmalloc relay connection");
96 goto end;
97 }
98 urcu_ref_init(&conn->ref);
99 conn->type = type;
100 conn->sock = sock;
101 lttng_ht_node_init_ulong(&conn->sock_n, (unsigned long) conn->sock->fd);
102 if (conn->type == RELAY_CONTROL) {
103 lttng_dynamic_buffer_init(&conn->protocol.ctrl.reception_buffer);
104 }
105 connection_reset_protocol_state(conn);
106 end:
107 return conn;
108 }
109
110 static void rcu_free_connection(struct rcu_head *head)
111 {
112 struct relay_connection *conn =
113 caa_container_of(head, struct relay_connection, rcu_node);
114
115 lttcomm_destroy_sock(conn->sock);
116 if (conn->viewer_session) {
117 viewer_session_destroy(conn->viewer_session);
118 conn->viewer_session = NULL;
119 }
120 if (conn->type == RELAY_CONTROL) {
121 lttng_dynamic_buffer_reset(
122 &conn->protocol.ctrl.reception_buffer);
123 }
124 free(conn);
125 }
126
127 static void destroy_connection(struct relay_connection *conn)
128 {
129 call_rcu(&conn->rcu_node, rcu_free_connection);
130 }
131
132 static void connection_release(struct urcu_ref *ref)
133 {
134 struct relay_connection *conn =
135 caa_container_of(ref, struct relay_connection, ref);
136
137 if (conn->in_socket_ht) {
138 struct lttng_ht_iter iter;
139 int ret;
140
141 iter.iter.node = &conn->sock_n.node;
142 ret = lttng_ht_del(conn->socket_ht, &iter);
143 assert(!ret);
144 }
145
146 if (conn->session) {
147 if (session_close(conn->session)) {
148 ERR("session_close");
149 }
150 conn->session = NULL;
151 }
152 if (conn->viewer_session) {
153 viewer_session_close(conn->viewer_session);
154 }
155 destroy_connection(conn);
156 }
157
158 void connection_put(struct relay_connection *conn)
159 {
160 rcu_read_lock();
161 urcu_ref_put(&conn->ref, connection_release);
162 rcu_read_unlock();
163 }
164
165 void connection_ht_add(struct lttng_ht *relay_connections_ht,
166 struct relay_connection *conn)
167 {
168 assert(!conn->in_socket_ht);
169 lttng_ht_add_unique_ulong(relay_connections_ht, &conn->sock_n);
170 conn->in_socket_ht = 1;
171 conn->socket_ht = relay_connections_ht;
172 }
173
174 int connection_set_session(struct relay_connection *conn,
175 struct relay_session *session)
176 {
177 int ret = 0;
178
179 assert(conn);
180 assert(session);
181 assert(!conn->session);
182
183 if (connection_get(conn)) {
184 if (session_get(session)) {
185 conn->session = session;
186 } else {
187 ERR("Failed to get session reference in connection_set_session()");
188 ret = -1;
189 }
190 connection_put(conn);
191 } else {
192 ERR("Failed to get connection reference in connection_set_session()");
193 ret = -1;
194 }
195 return ret;
196 }
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