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 |
| 35 | && (overlap(ops->set_optmin, ops->set_optmax, |
| 36 | reg->set_optmin, reg->set_optmax) |
| 37 | || overlap(ops->get_optmin, ops->get_optmax, |
| 38 | reg->get_optmin, reg->get_optmax))) { |
| 39 | NFDEBUG("nf_sock overlap: %u-%u/%u-%u v %u-%u/%u-%u\n", |
| 40 | ops->set_optmin, ops->set_optmax, |
| 41 | ops->get_optmin, ops->get_optmax, |
| 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 | { |
| 58 | /* No point being interruptible: we're probably in cleanup_module() */ |
| 59 | restart: |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 60 | mutex_lock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 61 | if (reg->use != 0) { |
| 62 | /* To be woken by nf_sockopt call... */ |
| 63 | /* FIXME: Stuart Young's name appears gratuitously. */ |
| 64 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 65 | reg->cleanup_task = current; |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 66 | mutex_unlock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 67 | schedule(); |
| 68 | goto restart; |
| 69 | } |
| 70 | list_del(®->list); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 71 | mutex_unlock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 72 | } |
| 73 | EXPORT_SYMBOL(nf_unregister_sockopt); |
| 74 | |
| 75 | /* Call get/setsockopt() */ |
| 76 | static int nf_sockopt(struct sock *sk, int pf, int val, |
| 77 | char __user *opt, int *len, int get) |
| 78 | { |
| 79 | struct list_head *i; |
| 80 | struct nf_sockopt_ops *ops; |
| 81 | int ret; |
| 82 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 83 | if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0) |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 84 | return -EINTR; |
| 85 | |
| 86 | list_for_each(i, &nf_sockopts) { |
| 87 | ops = (struct nf_sockopt_ops *)i; |
| 88 | if (ops->pf == pf) { |
| 89 | if (get) { |
| 90 | if (val >= ops->get_optmin |
| 91 | && val < ops->get_optmax) { |
| 92 | ops->use++; |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 93 | mutex_unlock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 94 | ret = ops->get(sk, val, opt, len); |
| 95 | goto out; |
| 96 | } |
| 97 | } else { |
| 98 | if (val >= ops->set_optmin |
| 99 | && val < ops->set_optmax) { |
| 100 | ops->use++; |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 101 | mutex_unlock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 102 | ret = ops->set(sk, val, opt, *len); |
| 103 | goto out; |
| 104 | } |
| 105 | } |
| 106 | } |
| 107 | } |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 108 | mutex_unlock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 109 | return -ENOPROTOOPT; |
| 110 | |
| 111 | out: |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 112 | mutex_lock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 113 | ops->use--; |
| 114 | if (ops->cleanup_task) |
| 115 | wake_up_process(ops->cleanup_task); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 116 | mutex_unlock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 117 | return ret; |
| 118 | } |
| 119 | |
| 120 | int nf_setsockopt(struct sock *sk, int pf, int val, char __user *opt, |
| 121 | int len) |
| 122 | { |
| 123 | return nf_sockopt(sk, pf, val, opt, &len, 0); |
| 124 | } |
| 125 | EXPORT_SYMBOL(nf_setsockopt); |
| 126 | |
| 127 | int nf_getsockopt(struct sock *sk, int pf, int val, char __user *opt, int *len) |
| 128 | { |
| 129 | return nf_sockopt(sk, pf, val, opt, len, 1); |
| 130 | } |
| 131 | EXPORT_SYMBOL(nf_getsockopt); |
| 132 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 133 | #ifdef CONFIG_COMPAT |
| 134 | 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] | 135 | char __user *opt, int *len, int get) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 136 | { |
| 137 | struct list_head *i; |
| 138 | struct nf_sockopt_ops *ops; |
| 139 | int ret; |
| 140 | |
| 141 | if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0) |
| 142 | return -EINTR; |
| 143 | |
| 144 | list_for_each(i, &nf_sockopts) { |
| 145 | ops = (struct nf_sockopt_ops *)i; |
| 146 | if (ops->pf == pf) { |
| 147 | if (get) { |
| 148 | if (val >= ops->get_optmin |
| 149 | && val < ops->get_optmax) { |
| 150 | ops->use++; |
| 151 | mutex_unlock(&nf_sockopt_mutex); |
| 152 | if (ops->compat_get) |
| 153 | ret = ops->compat_get(sk, |
| 154 | val, opt, len); |
| 155 | else |
| 156 | ret = ops->get(sk, |
| 157 | val, opt, len); |
| 158 | goto out; |
| 159 | } |
| 160 | } else { |
| 161 | if (val >= ops->set_optmin |
| 162 | && val < ops->set_optmax) { |
| 163 | ops->use++; |
| 164 | mutex_unlock(&nf_sockopt_mutex); |
| 165 | if (ops->compat_set) |
| 166 | ret = ops->compat_set(sk, |
| 167 | val, opt, *len); |
| 168 | else |
| 169 | ret = ops->set(sk, |
| 170 | val, opt, *len); |
| 171 | goto out; |
| 172 | } |
| 173 | } |
| 174 | } |
| 175 | } |
| 176 | mutex_unlock(&nf_sockopt_mutex); |
| 177 | return -ENOPROTOOPT; |
| 178 | |
| 179 | out: |
| 180 | mutex_lock(&nf_sockopt_mutex); |
| 181 | ops->use--; |
| 182 | if (ops->cleanup_task) |
| 183 | wake_up_process(ops->cleanup_task); |
| 184 | mutex_unlock(&nf_sockopt_mutex); |
| 185 | return ret; |
| 186 | } |
| 187 | |
| 188 | int compat_nf_setsockopt(struct sock *sk, int pf, |
| 189 | int val, char __user *opt, int len) |
| 190 | { |
| 191 | return compat_nf_sockopt(sk, pf, val, opt, &len, 0); |
| 192 | } |
| 193 | EXPORT_SYMBOL(compat_nf_setsockopt); |
| 194 | |
| 195 | int compat_nf_getsockopt(struct sock *sk, int pf, |
| 196 | int val, char __user *opt, int *len) |
| 197 | { |
| 198 | return compat_nf_sockopt(sk, pf, val, opt, len, 1); |
| 199 | } |
| 200 | EXPORT_SYMBOL(compat_nf_getsockopt); |
| 201 | #endif |