2 * Copyright (c) 2009 Robert N. M. Watson
3 * Copyright (c) 2009 Bjoern A. Zeeb <bz@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
37 #include <sys/_lock.h>
38 #include <sys/_mutex.h>
39 #include <sys/_task.h>
42 #include <sys/types.h>
51 #include "kvm_private.h"
54 * Set up libkvm to handle virtual network stack symbols by selecting a
58 _kvm_vnet_selectpid(kvm_t *kd, pid_t pid)
64 struct kvm_nlist nl[] = {
66 * Note: kvm_nlist strips the first '_' so add an extra one
67 * here to __{start,stop}_set_vnet.
69 #define NLIST_START_VNET 0
70 { .n_name = "___start_" VNET_SETNAME },
71 #define NLIST_STOP_VNET 1
72 { .n_name = "___stop_" VNET_SETNAME },
73 #define NLIST_VNET_HEAD 2
74 { .n_name = "vnet_head" },
75 #define NLIST_ALLPROC 3
76 { .n_name = "allproc" },
77 #define NLIST_DUMPTID 4
78 { .n_name = "dumptid" },
80 { .n_name = "proc0" },
83 uintptr_t procp, credp;
84 #define VMCORE_VNET_OF_PROC0
85 #ifndef VMCORE_VNET_OF_PROC0
92 * XXX: This only works for native kernels for now.
98 * Locate and cache locations of important symbols
99 * using the internal version of _kvm_nlist, turning
100 * off initialization to avoid recursion in case of
101 * unresolveable symbols.
103 if (_kvm_nlist(kd, nl, 0) != 0) {
105 * XXX-BZ: ___start_/___stop_VNET_SETNAME may fail.
106 * For now do not report an error here as we are called
107 * internally and in `void context' until we merge the
108 * functionality to optionally activate this into programs.
109 * By that time we can properly fail and let the callers
112 /* _kvm_err(kd, kd->program, "%s: no namelist", __func__); */
117 * Auto-detect if this is a crashdump by reading dumptid.
120 if (nl[NLIST_DUMPTID].n_value) {
121 if (kvm_read(kd, nl[NLIST_DUMPTID].n_value, &dumptid,
122 sizeof(dumptid)) != sizeof(dumptid)) {
123 _kvm_err(kd, kd->program, "%s: dumptid", __func__);
129 * First, find the process for this pid. If we are working on a
130 * dump, either locate the thread dumptid is referring to or proc0.
131 * Based on either, take the address of the ucred.
135 procp = nl[NLIST_ALLPROC].n_value;
136 #ifdef VMCORE_VNET_OF_PROC0
138 procp = nl[NLIST_PROC0].n_value;
143 if (kvm_read(kd, procp, &proc, sizeof(proc)) != sizeof(proc)) {
144 _kvm_err(kd, kd->program, "%s: proc", __func__);
147 #ifndef VMCORE_VNET_OF_PROC0
149 tdp = (uintptr_t)TAILQ_FIRST(&proc.p_threads);
151 if (kvm_read(kd, tdp, &td, sizeof(td)) !=
153 _kvm_err(kd, kd->program, "%s: thread",
157 if (td.td_tid == dumptid) {
158 credp = (uintptr_t)td.td_ucred;
161 tdp = (uintptr_t)TAILQ_NEXT(&td, td_plist);
165 if (proc.p_pid == pid)
166 credp = (uintptr_t)proc.p_ucred;
169 procp = (uintptr_t)LIST_NEXT(&proc, p_list);
172 _kvm_err(kd, kd->program, "%s: pid/tid not found", __func__);
175 if (kvm_read(kd, (uintptr_t)credp, &cred, sizeof(cred)) !=
177 _kvm_err(kd, kd->program, "%s: cred", __func__);
180 if (cred.cr_prison == NULL) {
181 _kvm_err(kd, kd->program, "%s: no jail", __func__);
184 if (kvm_read(kd, (uintptr_t)cred.cr_prison, &prison, sizeof(prison)) !=
186 _kvm_err(kd, kd->program, "%s: prison", __func__);
189 if (prison.pr_vnet == NULL) {
190 _kvm_err(kd, kd->program, "%s: no vnet", __func__);
193 if (kvm_read(kd, (uintptr_t)prison.pr_vnet, &vnet, sizeof(vnet)) !=
195 _kvm_err(kd, kd->program, "%s: vnet", __func__);
198 if (vnet.vnet_magic_n != VNET_MAGIC_N) {
199 _kvm_err(kd, kd->program, "%s: invalid vnet magic#", __func__);
202 kd->vnet_initialized = 1;
203 kd->vnet_start = nl[NLIST_START_VNET].n_value;
204 kd->vnet_stop = nl[NLIST_STOP_VNET].n_value;
205 kd->vnet_current = (uintptr_t)prison.pr_vnet;
206 kd->vnet_base = vnet.vnet_data_base;
211 * Check whether the vnet module has been initialized successfully
212 * or not, initialize it if permitted.
215 _kvm_vnet_initialized(kvm_t *kd, int intialize)
218 if (kd->vnet_initialized || !intialize)
219 return (kd->vnet_initialized);
221 (void) _kvm_vnet_selectpid(kd, getpid());
223 return (kd->vnet_initialized);
227 * Check whether the value is within the vnet symbol range and
228 * only if so adjust the offset relative to the current base.
231 _kvm_vnet_validaddr(kvm_t *kd, kvaddr_t value)
237 if (!kd->vnet_initialized)
240 if (value < kd->vnet_start || value >= kd->vnet_stop)
243 return (kd->vnet_base + value);