1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
3 * lttng-context-net-ns.c
5 * LTTng net namespace context.
7 * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * 2019 Michael Jeanson <mjeanson@efficios.com>
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/sched.h>
17 #include <linux/nsproxy.h>
18 #include <net/net_namespace.h>
19 #include <lttng/events.h>
20 #include <lttng/events-internal.h>
21 #include <ringbuffer/frontend_types.h>
22 #include <wrapper/vmalloc.h>
23 #include <lttng/tracer.h>
26 size_t net_ns_get_size(void *priv
, struct lttng_kernel_probe_ctx
*probe_ctx
, size_t offset
)
30 size
+= lib_ring_buffer_align(offset
, lttng_alignof(unsigned int));
31 size
+= sizeof(unsigned int);
36 void net_ns_record(void *priv
, struct lttng_kernel_probe_ctx
*probe_ctx
,
37 struct lttng_kernel_ring_buffer_ctx
*ctx
,
38 struct lttng_kernel_channel_buffer
*chan
)
40 unsigned int net_ns_inum
= 0;
43 * nsproxy can be NULL when scheduled out of exit.
45 * As documented in 'linux/nsproxy.h' namespaces access rules, no
46 * precautions should be taken when accessing the current task's
47 * namespaces, just dereference the pointers.
50 net_ns_inum
= current
->nsproxy
->net_ns
->ns
.inum
;
52 chan
->ops
->event_write(ctx
, &net_ns_inum
, sizeof(net_ns_inum
), lttng_alignof(net_ns_inum
));
56 void net_ns_get_value(void *priv
,
57 struct lttng_kernel_probe_ctx
*lttng_probe_ctx
,
58 struct lttng_ctx_value
*value
)
60 unsigned int net_ns_inum
= 0;
63 * nsproxy can be NULL when scheduled out of exit.
65 * As documented in 'linux/nsproxy.h' namespaces access rules, no
66 * precautions should be taken when accessing the current task's
67 * namespaces, just dereference the pointers.
70 net_ns_inum
= current
->nsproxy
->net_ns
->ns
.inum
;
72 value
->u
.s64
= net_ns_inum
;
75 static const struct lttng_kernel_ctx_field
*ctx_field
= lttng_kernel_static_ctx_field(
76 lttng_kernel_static_event_field("net_ns",
77 lttng_kernel_static_type_integer_from_type(unsigned int, __BYTE_ORDER
, 10),
84 int lttng_add_net_ns_to_ctx(struct lttng_kernel_ctx
**ctx
)
88 if (lttng_kernel_find_context(*ctx
, ctx_field
->event_field
->name
))
90 ret
= lttng_kernel_context_append(ctx
, ctx_field
);
91 wrapper_vmalloc_sync_mappings();
94 EXPORT_SYMBOL_GPL(lttng_add_net_ns_to_ctx
);