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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 | /* * IP_MASQ_MOD masq modules support * * * Author: Juan Jose Ciarlante, <jjciarla@raiz.uncu.edu.ar> * * $Id: ip_masq_mod.c,v 1.5.2.1 1999/07/02 10:10:03 davem Exp $ * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Changes: * Cyrus Durgin: fixed kerneld stuff for kmod. */ #include <linux/config.h> #include <linux/module.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/errno.h> #include <net/ip_masq.h> #include <net/ip_masq_mod.h> #include <linux/ip_masq.h> #ifdef CONFIG_KMOD #include <linux/kmod.h> #endif EXPORT_SYMBOL(register_ip_masq_mod); EXPORT_SYMBOL(unregister_ip_masq_mod); EXPORT_SYMBOL(ip_masq_mod_lkp_link); EXPORT_SYMBOL(ip_masq_mod_lkp_unlink); static spinlock_t masq_mod_lock = SPIN_LOCK_UNLOCKED; /* * Base pointer for registered modules */ struct ip_masq_mod * ip_masq_mod_reg_base = NULL; /* * Base pointer for lookup (subset of above, a module could be * registered, but it could have no active rule); will avoid * unnecessary lookups. */ struct ip_masq_mod * ip_masq_mod_lkp_base = NULL; int ip_masq_mod_register_proc(struct ip_masq_mod *mmod) { #ifdef CONFIG_PROC_FS int ret; struct proc_dir_entry *ent = mmod->mmod_proc_ent; if (!ent) return 0; if (!ent->name) { ent->name = mmod->mmod_name; ent->namelen = strlen (mmod->mmod_name); } ret = ip_masq_proc_register(ent); if (ret) mmod->mmod_proc_ent = NULL; return ret; #else return 0; #endif } void ip_masq_mod_unregister_proc(struct ip_masq_mod *mmod) { #ifdef CONFIG_PROC_FS struct proc_dir_entry *ent = mmod->mmod_proc_ent; if (!ent) return; ip_masq_proc_unregister(ent); #endif } /* * Link/unlink object for lookups */ int ip_masq_mod_lkp_unlink(struct ip_masq_mod *mmod) { struct ip_masq_mod **mmod_p; write_lock_bh(&masq_mod_lock); for (mmod_p = &ip_masq_mod_lkp_base; *mmod_p ; mmod_p = &(*mmod_p)->next) if (mmod == (*mmod_p)) { *mmod_p = mmod->next; mmod->next = NULL; write_unlock_bh(&masq_mod_lock); return 0; } write_unlock_bh(&masq_mod_lock); return -EINVAL; } int ip_masq_mod_lkp_link(struct ip_masq_mod *mmod) { write_lock_bh(&masq_mod_lock); mmod->next = ip_masq_mod_lkp_base; ip_masq_mod_lkp_base=mmod; write_unlock_bh(&masq_mod_lock); return 0; } int register_ip_masq_mod(struct ip_masq_mod *mmod) { if (!mmod) { IP_MASQ_ERR("register_ip_masq_mod(): NULL arg\n"); return -EINVAL; } if (!mmod->mmod_name) { IP_MASQ_ERR("register_ip_masq_mod(): NULL mmod_name\n"); return -EINVAL; } ip_masq_mod_register_proc(mmod); mmod->next_reg = ip_masq_mod_reg_base; ip_masq_mod_reg_base=mmod; return 0; } int unregister_ip_masq_mod(struct ip_masq_mod *mmod) { struct ip_masq_mod **mmod_p; if (!mmod) { IP_MASQ_ERR( "unregister_ip_masq_mod(): NULL arg\n"); return -EINVAL; } /* * Only allow unregistration if it is not referenced */ if (atomic_read(&mmod->refcnt)) { IP_MASQ_ERR( "unregister_ip_masq_mod(): is in use by %d guys. failed\n", atomic_read(&mmod->refcnt)); return -EINVAL; } /* * Must be already unlinked from lookup list */ if (mmod->next) { IP_MASQ_WARNING("MASQ: unregistering \"%s\" while in lookup list.fixed.", mmod->mmod_name); ip_masq_mod_lkp_unlink(mmod); } for (mmod_p = &ip_masq_mod_reg_base; *mmod_p ; mmod_p = &(*mmod_p)->next_reg) if (mmod == (*mmod_p)) { ip_masq_mod_unregister_proc(mmod); *mmod_p = mmod->next_reg; return 0; } IP_MASQ_ERR("unregister_ip_masq_mod(%s): not linked \n", mmod->mmod_name); return -EINVAL; } int ip_masq_mod_in_rule(const struct sk_buff *skb, const struct iphdr *iph) { struct ip_masq_mod *mmod; int ret = IP_MASQ_MOD_NOP; for (mmod=ip_masq_mod_lkp_base;mmod;mmod=mmod->next) { if (!mmod->mmod_in_rule) continue; switch (ret=mmod->mmod_in_rule(skb, iph)) { case IP_MASQ_MOD_NOP: continue; case IP_MASQ_MOD_ACCEPT: case IP_MASQ_MOD_REJECT: goto out; } } out: return ret; } int ip_masq_mod_out_rule(const struct sk_buff *skb, const struct iphdr *iph) { struct ip_masq_mod *mmod; int ret = IP_MASQ_MOD_NOP; for (mmod=ip_masq_mod_lkp_base;mmod;mmod=mmod->next) { if (!mmod->mmod_out_rule) continue; switch (ret=mmod->mmod_out_rule(skb, iph)) { case IP_MASQ_MOD_NOP: continue; case IP_MASQ_MOD_ACCEPT: case IP_MASQ_MOD_REJECT: goto out; } } out: return ret; } struct ip_masq * ip_masq_mod_in_create(const struct sk_buff *skb, const struct iphdr *iph, __u32 maddr) { struct ip_masq_mod *mmod; struct ip_masq *ms = NULL; for (mmod=ip_masq_mod_lkp_base;mmod;mmod=mmod->next) { if (!mmod->mmod_in_create) continue; if ((ms=mmod->mmod_in_create(skb, iph, maddr))) { goto out; } } out: return ms; } struct ip_masq * ip_masq_mod_out_create(const struct sk_buff *skb, const struct iphdr *iph, __u32 maddr) { struct ip_masq_mod *mmod; struct ip_masq *ms = NULL; for (mmod=ip_masq_mod_lkp_base;mmod;mmod=mmod->next) { if (!mmod->mmod_out_create) continue; if ((ms=mmod->mmod_out_create(skb, iph, maddr))) { goto out; } } out: return ms; } int ip_masq_mod_in_update(const struct sk_buff *skb, const struct iphdr *iph, struct ip_masq *ms) { struct ip_masq_mod *mmod; int ret = IP_MASQ_MOD_NOP; for (mmod=ip_masq_mod_lkp_base;mmod;mmod=mmod->next) { if (!mmod->mmod_in_update) continue; switch (ret=mmod->mmod_in_update(skb, iph, ms)) { case IP_MASQ_MOD_NOP: continue; case IP_MASQ_MOD_ACCEPT: case IP_MASQ_MOD_REJECT: goto out; } } out: return ret; } int ip_masq_mod_out_update(const struct sk_buff *skb, const struct iphdr *iph, struct ip_masq *ms) { struct ip_masq_mod *mmod; int ret = IP_MASQ_MOD_NOP; for (mmod=ip_masq_mod_lkp_base;mmod;mmod=mmod->next) { if (!mmod->mmod_out_update) continue; switch (ret=mmod->mmod_out_update(skb, iph, ms)) { case IP_MASQ_MOD_NOP: continue; case IP_MASQ_MOD_ACCEPT: case IP_MASQ_MOD_REJECT: goto out; } } out: return ret; } struct ip_masq_mod * ip_masq_mod_getbyname(const char *mmod_name) { struct ip_masq_mod * mmod; IP_MASQ_DEBUG(1, "searching mmod_name \"%s\"\n", mmod_name); for (mmod=ip_masq_mod_reg_base; mmod ; mmod=mmod->next_reg) { if (mmod->mmod_ctl && *(mmod_name) && (strcmp(mmod_name, mmod->mmod_name)==0)) { /* HIT */ return mmod; } } return NULL; } /* * Module control entry */ int ip_masq_mod_ctl(int optname, struct ip_masq_ctl *mctl, int optlen) { struct ip_masq_mod * mmod; #ifdef CONFIG_KMOD char kmod_name[IP_MASQ_TNAME_MAX+8]; #endif /* tappo */ mctl->m_tname[IP_MASQ_TNAME_MAX-1] = 0; mmod = ip_masq_mod_getbyname(mctl->m_tname); if (mmod) return mmod->mmod_ctl(optname, mctl, optlen); #ifdef CONFIG_KMOD sprintf(kmod_name,"ip_masq_%s", mctl->m_tname); IP_MASQ_DEBUG(1, "About to request \"%s\" module\n", kmod_name); /* * Let sleep for a while ... */ request_module(kmod_name); mmod = ip_masq_mod_getbyname(mctl->m_tname); if (mmod) return mmod->mmod_ctl(optname, mctl, optlen); #endif return ESRCH; } |