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1da177e4 LT |
1 | /* |
2 | * linux/drivers/net/netconsole.c | |
3 | * | |
4 | * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> | |
5 | * | |
6 | * This file contains the implementation of an IRQ-safe, crash-safe | |
7 | * kernel console implementation that outputs kernel messages to the | |
8 | * network. | |
9 | * | |
10 | * Modification history: | |
11 | * | |
12 | * 2001-09-17 started by Ingo Molnar. | |
13 | * 2003-08-11 2.6 port by Matt Mackall | |
14 | * simplified options | |
15 | * generic card hooks | |
16 | * works non-modular | |
17 | * 2003-09-07 rewritten with netpoll api | |
18 | */ | |
19 | ||
20 | /**************************************************************** | |
21 | * This program is free software; you can redistribute it and/or modify | |
22 | * it under the terms of the GNU General Public License as published by | |
23 | * the Free Software Foundation; either version 2, or (at your option) | |
24 | * any later version. | |
25 | * | |
26 | * This program is distributed in the hope that it will be useful, | |
27 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
29 | * GNU General Public License for more details. | |
30 | * | |
31 | * You should have received a copy of the GNU General Public License | |
32 | * along with this program; if not, write to the Free Software | |
33 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
34 | * | |
35 | ****************************************************************/ | |
36 | ||
37 | #include <linux/mm.h> | |
1da177e4 LT |
38 | #include <linux/init.h> |
39 | #include <linux/module.h> | |
40 | #include <linux/console.h> | |
1da177e4 LT |
41 | #include <linux/moduleparam.h> |
42 | #include <linux/string.h> | |
1da177e4 LT |
43 | #include <linux/netpoll.h> |
44 | ||
45 | MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>"); | |
46 | MODULE_DESCRIPTION("Console driver for network interfaces"); | |
47 | MODULE_LICENSE("GPL"); | |
48 | ||
d39badf0 SS |
49 | #define MAX_PARAM_LENGTH 256 |
50 | #define MAX_PRINT_CHUNK 1000 | |
51 | ||
52 | static char config[MAX_PARAM_LENGTH]; | |
53 | module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0); | |
1da177e4 LT |
54 | MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]\n"); |
55 | ||
d2b60881 SS |
56 | #ifndef MODULE |
57 | static int __init option_setup(char *opt) | |
58 | { | |
59 | strlcpy(config, opt, MAX_PARAM_LENGTH); | |
60 | return 1; | |
61 | } | |
62 | __setup("netconsole=", option_setup); | |
63 | #endif /* MODULE */ | |
64 | ||
df180e36 SS |
65 | /** |
66 | * struct netconsole_target - Represents a configured netconsole target. | |
67 | * @np: The netpoll structure for this target. | |
68 | */ | |
69 | struct netconsole_target { | |
70 | struct netpoll np; | |
71 | }; | |
72 | ||
73 | static struct netconsole_target default_target = { | |
74 | .np = { | |
75 | .name = "netconsole", | |
76 | .dev_name = "eth0", | |
77 | .local_port = 6665, | |
78 | .remote_port = 6666, | |
79 | .remote_mac = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, | |
80 | }, | |
1da177e4 | 81 | }; |
1da177e4 LT |
82 | |
83 | static void write_msg(struct console *con, const char *msg, unsigned int len) | |
84 | { | |
85 | int frag, left; | |
86 | unsigned long flags; | |
df180e36 | 87 | struct netconsole_target *nt = &default_target; |
1da177e4 | 88 | |
df180e36 | 89 | if (netif_running(nt->np.dev)) { |
0cc120be SS |
90 | local_irq_save(flags); |
91 | for (left = len; left;) { | |
92 | frag = min(left, MAX_PRINT_CHUNK); | |
df180e36 | 93 | netpoll_send_udp(&nt->np, msg, frag); |
0cc120be SS |
94 | msg += frag; |
95 | left -= frag; | |
96 | } | |
97 | local_irq_restore(flags); | |
1da177e4 | 98 | } |
1da177e4 LT |
99 | } |
100 | ||
101 | static struct console netconsole = { | |
d39badf0 SS |
102 | .name = "netcon", |
103 | .flags = CON_ENABLED | CON_PRINTBUFFER, | |
104 | .write = write_msg, | |
1da177e4 LT |
105 | }; |
106 | ||
d39badf0 | 107 | static int __init init_netconsole(void) |
1da177e4 | 108 | { |
d39badf0 | 109 | int err = 0; |
df180e36 | 110 | struct netconsole_target *nt = &default_target; |
b41848b6 | 111 | |
d2b60881 | 112 | if (!strnlen(config, MAX_PARAM_LENGTH)) { |
d39badf0 SS |
113 | printk(KERN_INFO "netconsole: not configured, aborting\n"); |
114 | goto out; | |
1da177e4 LT |
115 | } |
116 | ||
df180e36 | 117 | err = netpoll_parse_options(&nt->np, config); |
d2b60881 SS |
118 | if (err) |
119 | goto out; | |
120 | ||
df180e36 | 121 | err = netpoll_setup(&nt->np); |
b41848b6 | 122 | if (err) |
d39badf0 | 123 | goto out; |
1da177e4 LT |
124 | |
125 | register_console(&netconsole); | |
126 | printk(KERN_INFO "netconsole: network logging started\n"); | |
d39badf0 SS |
127 | |
128 | out: | |
129 | return err; | |
1da177e4 LT |
130 | } |
131 | ||
d39badf0 | 132 | static void __exit cleanup_netconsole(void) |
1da177e4 | 133 | { |
df180e36 SS |
134 | struct netconsole_target *nt = &default_target; |
135 | ||
1da177e4 | 136 | unregister_console(&netconsole); |
df180e36 | 137 | netpoll_cleanup(&nt->np); |
1da177e4 LT |
138 | } |
139 | ||
140 | module_init(init_netconsole); | |
141 | module_exit(cleanup_netconsole); |