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 | { |
Alexey Dobriyan | 55d84ac | 2007-11-05 20:44:06 -0800 | [diff] [blame] | 26 | struct nf_sockopt_ops *ops; |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 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 | |
Alexey Dobriyan | 55d84ac | 2007-11-05 20:44:06 -0800 | [diff] [blame] | 32 | list_for_each_entry(ops, &nf_sockopts, list) { |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 33 | if (ops->pf == reg->pf |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 34 | && (overlap(ops->set_optmin, ops->set_optmax, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 35 | reg->set_optmin, reg->set_optmax) |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 36 | || overlap(ops->get_optmin, ops->get_optmax, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 37 | reg->get_optmin, reg->get_optmax))) { |
| 38 | 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] | 39 | ops->set_optmin, ops->set_optmax, |
| 40 | ops->get_optmin, ops->get_optmax, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 41 | reg->set_optmin, reg->set_optmax, |
| 42 | reg->get_optmin, reg->get_optmax); |
| 43 | ret = -EBUSY; |
| 44 | goto out; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | list_add(®->list, &nf_sockopts); |
| 49 | out: |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 50 | mutex_unlock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 51 | return ret; |
| 52 | } |
| 53 | EXPORT_SYMBOL(nf_register_sockopt); |
| 54 | |
| 55 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg) |
| 56 | { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 57 | mutex_lock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 58 | list_del(®->list); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 59 | mutex_unlock(&nf_sockopt_mutex); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 60 | } |
| 61 | EXPORT_SYMBOL(nf_unregister_sockopt); |
| 62 | |
Pavel Emelyanov | 4ce5ba6 | 2007-11-13 02:58:09 -0800 | [diff] [blame] | 63 | static struct nf_sockopt_ops *nf_sockopt_find(struct sock *sk, int pf, |
| 64 | int val, int get) |
| 65 | { |
| 66 | struct nf_sockopt_ops *ops; |
| 67 | |
| 68 | if (sk->sk_net != &init_net) |
| 69 | return ERR_PTR(-ENOPROTOOPT); |
| 70 | |
| 71 | if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0) |
| 72 | return ERR_PTR(-EINTR); |
| 73 | |
| 74 | list_for_each_entry(ops, &nf_sockopts, list) { |
| 75 | if (ops->pf == pf) { |
| 76 | if (!try_module_get(ops->owner)) |
| 77 | goto out_nosup; |
| 78 | |
| 79 | if (get) { |
| 80 | if (val >= ops->get_optmin && |
| 81 | val < ops->get_optmax) |
| 82 | goto out; |
| 83 | } else { |
| 84 | if (val >= ops->set_optmin && |
| 85 | val < ops->set_optmax) |
| 86 | goto out; |
| 87 | } |
| 88 | module_put(ops->owner); |
| 89 | } |
| 90 | } |
| 91 | out_nosup: |
| 92 | ops = ERR_PTR(-ENOPROTOOPT); |
| 93 | out: |
| 94 | mutex_unlock(&nf_sockopt_mutex); |
| 95 | return ops; |
| 96 | } |
| 97 | |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 98 | /* Call get/setsockopt() */ |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 99 | static int nf_sockopt(struct sock *sk, int pf, int val, |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 100 | char __user *opt, int *len, int get) |
| 101 | { |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 102 | struct nf_sockopt_ops *ops; |
| 103 | int ret; |
| 104 | |
Pavel Emelyanov | 4ce5ba6 | 2007-11-13 02:58:09 -0800 | [diff] [blame] | 105 | ops = nf_sockopt_find(sk, pf, val, get); |
| 106 | if (IS_ERR(ops)) |
| 107 | return PTR_ERR(ops); |
Eric W. Biederman | c48dad7 | 2007-09-12 13:58:02 +0200 | [diff] [blame] | 108 | |
Pavel Emelyanov | 4ce5ba6 | 2007-11-13 02:58:09 -0800 | [diff] [blame] | 109 | if (get) |
| 110 | ret = ops->get(sk, val, opt, len); |
| 111 | else |
| 112 | ret = ops->set(sk, val, opt, *len); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 113 | |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 114 | module_put(ops->owner); |
Harald Welte | f6ebe77 | 2005-08-09 20:21:49 -0700 | [diff] [blame] | 115 | return ret; |
| 116 | } |
| 117 | |
| 118 | int nf_setsockopt(struct sock *sk, int pf, int val, char __user *opt, |
| 119 | int len) |
| 120 | { |
| 121 | return nf_sockopt(sk, pf, val, opt, &len, 0); |
| 122 | } |
| 123 | EXPORT_SYMBOL(nf_setsockopt); |
| 124 | |
| 125 | int nf_getsockopt(struct sock *sk, int pf, int val, char __user *opt, int *len) |
| 126 | { |
| 127 | return nf_sockopt(sk, pf, val, opt, len, 1); |
| 128 | } |
| 129 | EXPORT_SYMBOL(nf_getsockopt); |
| 130 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 131 | #ifdef CONFIG_COMPAT |
| 132 | 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] | 133 | char __user *opt, int *len, int get) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 134 | { |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 135 | struct nf_sockopt_ops *ops; |
| 136 | int ret; |
| 137 | |
Pavel Emelyanov | 4ce5ba6 | 2007-11-13 02:58:09 -0800 | [diff] [blame] | 138 | ops = nf_sockopt_find(sk, pf, val, get); |
| 139 | if (IS_ERR(ops)) |
| 140 | return PTR_ERR(ops); |
Eric W. Biederman | c48dad7 | 2007-09-12 13:58:02 +0200 | [diff] [blame] | 141 | |
Pavel Emelyanov | 4ce5ba6 | 2007-11-13 02:58:09 -0800 | [diff] [blame] | 142 | if (get) { |
| 143 | if (ops->compat_get) |
| 144 | ret = ops->compat_get(sk, val, opt, len); |
| 145 | else |
Patrick McHardy | 6452a5f | 2007-11-15 14:29:21 -0800 | [diff] [blame] | 146 | ret = ops->get(sk, val, opt, len); |
Pavel Emelyanov | 4ce5ba6 | 2007-11-13 02:58:09 -0800 | [diff] [blame] | 147 | } else { |
| 148 | if (ops->compat_set) |
Patrick McHardy | 6452a5f | 2007-11-15 14:29:21 -0800 | [diff] [blame] | 149 | ret = ops->compat_set(sk, val, opt, *len); |
Pavel Emelyanov | 4ce5ba6 | 2007-11-13 02:58:09 -0800 | [diff] [blame] | 150 | else |
Patrick McHardy | 6452a5f | 2007-11-15 14:29:21 -0800 | [diff] [blame] | 151 | ret = ops->set(sk, val, opt, *len); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 152 | } |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 153 | |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 154 | module_put(ops->owner); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 155 | return ret; |
| 156 | } |
| 157 | |
| 158 | int compat_nf_setsockopt(struct sock *sk, int pf, |
| 159 | int val, char __user *opt, int len) |
| 160 | { |
| 161 | return compat_nf_sockopt(sk, pf, val, opt, &len, 0); |
| 162 | } |
| 163 | EXPORT_SYMBOL(compat_nf_setsockopt); |
| 164 | |
| 165 | int compat_nf_getsockopt(struct sock *sk, int pf, |
| 166 | int val, char __user *opt, int *len) |
| 167 | { |
| 168 | return compat_nf_sockopt(sk, pf, val, opt, len, 1); |
| 169 | } |
| 170 | EXPORT_SYMBOL(compat_nf_getsockopt); |
| 171 | #endif |