Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 1 | #include <linux/kernel.h> |
| 2 | #include <linux/init.h> |
| 3 | #include <linux/module.h> |
| 4 | #include <linux/skbuff.h> |
| 5 | #include <linux/netfilter.h> |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 6 | #include <linux/mutex.h> |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 7 | #include <net/sock.h> |
| 8 | |
| 9 | #include "nf_internals.h" |
| 10 | |
| 11 | /* Sockopts only registered and called from user context, so |
| 12 | net locking would be overkill. Also, [gs]etsockopt calls may |
| 13 | sleep. */ |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 14 | static DEFINE_MUTEX(nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 15 | static LIST_HEAD(nf_sockopts); |
| 16 | |
| 17 | /* Do exclusive ranges overlap? */ |
| 18 | static inline int overlap(int min1, int max1, int min2, int max2) |
| 19 | { |
| 20 | return max1 > min2 && min1 < max2; |
| 21 | } |
| 22 | |
| 23 | /* Functions to register sockopt ranges (exclusive). */ |
| 24 | int nf_register_sockopt(struct nf_sockopt_ops *reg) |
| 25 | { |
| 26 | struct list_head *i; |
| 27 | int ret = 0; |
| 28 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 29 | if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 30 | return -EINTR; |
| 31 | |
| 32 | list_for_each(i, &nf_sockopts) { |
| 33 | struct nf_sockopt_ops *ops = (struct nf_sockopt_ops *)i; |
| 34 | if (ops->pf == reg->pf |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 35 | && (overlap(ops->set_optmin, ops->set_optmax, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 36 | reg->set_optmin, reg->set_optmax) |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 37 | || overlap(ops->get_optmin, ops->get_optmax, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 38 | reg->get_optmin, reg->get_optmax))) { |
| 39 | NFDEBUG("nf_sock overlap: %u-%u/%u-%u v %u-%u/%u-%u\n", |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 40 | ops->set_optmin, ops->set_optmax, |
| 41 | ops->get_optmin, ops->get_optmax, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 42 | reg->set_optmin, reg->set_optmax, |
| 43 | reg->get_optmin, reg->get_optmax); |
| 44 | ret = -EBUSY; |
| 45 | goto out; |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | list_add(®->list, &nf_sockopts); |
| 50 | out: |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 51 | mutex_unlock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 52 | return ret; |
| 53 | } |
| 54 | EXPORT_SYMBOL(nf_register_sockopt); |
| 55 | |
| 56 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg) |
| 57 | { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 58 | mutex_lock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 59 | list_del(®->list); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 60 | mutex_unlock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 61 | } |
| 62 | EXPORT_SYMBOL(nf_unregister_sockopt); |
| 63 | |
| 64 | /* Call get/setsockopt() */ |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 65 | static int nf_sockopt(struct sock *sk, int pf, int val, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 66 | char __user *opt, int *len, int get) |
| 67 | { |
| 68 | struct list_head *i; |
| 69 | struct nf_sockopt_ops *ops; |
| 70 | int ret; |
| 71 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 72 | if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 73 | return -EINTR; |
| 74 | |
| 75 | list_for_each(i, &nf_sockopts) { |
| 76 | ops = (struct nf_sockopt_ops *)i; |
| 77 | if (ops->pf == pf) { |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame^] | 78 | if (!try_module_get(ops->owner)) |
| 79 | goto out_nosup; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 80 | if (get) { |
| 81 | if (val >= ops->get_optmin |
| 82 | && val < ops->get_optmax) { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 83 | mutex_unlock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 84 | ret = ops->get(sk, val, opt, len); |
| 85 | goto out; |
| 86 | } |
| 87 | } else { |
| 88 | if (val >= ops->set_optmin |
| 89 | && val < ops->set_optmax) { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 90 | mutex_unlock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 91 | ret = ops->set(sk, val, opt, *len); |
| 92 | goto out; |
| 93 | } |
| 94 | } |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame^] | 95 | module_put(ops->owner); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 96 | } |
| 97 | } |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame^] | 98 | out_nosup: |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 99 | mutex_unlock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 100 | return -ENOPROTOOPT; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 101 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 102 | out: |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame^] | 103 | module_put(ops->owner); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 104 | return ret; |
| 105 | } |
| 106 | |
| 107 | int nf_setsockopt(struct sock *sk, int pf, int val, char __user *opt, |
| 108 | int len) |
| 109 | { |
| 110 | return nf_sockopt(sk, pf, val, opt, &len, 0); |
| 111 | } |
| 112 | EXPORT_SYMBOL(nf_setsockopt); |
| 113 | |
| 114 | int nf_getsockopt(struct sock *sk, int pf, int val, char __user *opt, int *len) |
| 115 | { |
| 116 | return nf_sockopt(sk, pf, val, opt, len, 1); |
| 117 | } |
| 118 | EXPORT_SYMBOL(nf_getsockopt); |
| 119 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 120 | #ifdef CONFIG_COMPAT |
| 121 | static int compat_nf_sockopt(struct sock *sk, int pf, int val, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 122 | char __user *opt, int *len, int get) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 123 | { |
| 124 | struct list_head *i; |
| 125 | struct nf_sockopt_ops *ops; |
| 126 | int ret; |
| 127 | |
| 128 | if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0) |
| 129 | return -EINTR; |
| 130 | |
| 131 | list_for_each(i, &nf_sockopts) { |
| 132 | ops = (struct nf_sockopt_ops *)i; |
| 133 | if (ops->pf == pf) { |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame^] | 134 | if (!try_module_get(ops->owner)) |
| 135 | goto out_nosup; |
| 136 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 137 | if (get) { |
| 138 | if (val >= ops->get_optmin |
| 139 | && val < ops->get_optmax) { |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 140 | mutex_unlock(&nf_sockopt_mutex); |
| 141 | if (ops->compat_get) |
| 142 | ret = ops->compat_get(sk, |
| 143 | val, opt, len); |
| 144 | else |
| 145 | ret = ops->get(sk, |
| 146 | val, opt, len); |
| 147 | goto out; |
| 148 | } |
| 149 | } else { |
| 150 | if (val >= ops->set_optmin |
| 151 | && val < ops->set_optmax) { |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 152 | mutex_unlock(&nf_sockopt_mutex); |
| 153 | if (ops->compat_set) |
| 154 | ret = ops->compat_set(sk, |
| 155 | val, opt, *len); |
| 156 | else |
| 157 | ret = ops->set(sk, |
| 158 | val, opt, *len); |
| 159 | goto out; |
| 160 | } |
| 161 | } |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame^] | 162 | module_put(ops->owner); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 163 | } |
| 164 | } |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame^] | 165 | out_nosup: |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 166 | mutex_unlock(&nf_sockopt_mutex); |
| 167 | return -ENOPROTOOPT; |
| 168 | |
| 169 | out: |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame^] | 170 | module_put(ops->owner); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 171 | return ret; |
| 172 | } |
| 173 | |
| 174 | int compat_nf_setsockopt(struct sock *sk, int pf, |
| 175 | int val, char __user *opt, int len) |
| 176 | { |
| 177 | return compat_nf_sockopt(sk, pf, val, opt, &len, 0); |
| 178 | } |
| 179 | EXPORT_SYMBOL(compat_nf_setsockopt); |
| 180 | |
| 181 | int compat_nf_getsockopt(struct sock *sk, int pf, |
| 182 | int val, char __user *opt, int *len) |
| 183 | { |
| 184 | return compat_nf_sockopt(sk, pf, val, opt, len, 1); |
| 185 | } |
| 186 | EXPORT_SYMBOL(compat_nf_getsockopt); |
| 187 | #endif |