Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* xfrm_user.c: User interface to configure xfrm engine. |
| 2 | * |
| 3 | * Copyright (C) 2002 David S. Miller (davem@redhat.com) |
| 4 | * |
| 5 | * Changes: |
| 6 | * Mitsuru KANDA @USAGI |
| 7 | * Kazunori MIYAZAWA @USAGI |
| 8 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> |
| 9 | * IPv6 support |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 10 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
| 12 | |
Herbert Xu | 9409f38 | 2006-08-06 19:49:12 +1000 | [diff] [blame] | 13 | #include <linux/crypto.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/socket.h> |
| 19 | #include <linux/string.h> |
| 20 | #include <linux/net.h> |
| 21 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/rtnetlink.h> |
| 23 | #include <linux/pfkeyv2.h> |
| 24 | #include <linux/ipsec.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/security.h> |
| 27 | #include <net/sock.h> |
| 28 | #include <net/xfrm.h> |
Thomas Graf | 88fc2c8 | 2005-11-10 02:25:54 +0100 | [diff] [blame] | 29 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <asm/uaccess.h> |
| 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type) |
| 33 | { |
| 34 | struct rtattr *rt = xfrma[type - 1]; |
| 35 | struct xfrm_algo *algp; |
Herbert Xu | 31c2685 | 2005-05-19 12:39:49 -0700 | [diff] [blame] | 36 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | if (!rt) |
| 39 | return 0; |
| 40 | |
Herbert Xu | 31c2685 | 2005-05-19 12:39:49 -0700 | [diff] [blame] | 41 | len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp); |
| 42 | if (len < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | return -EINVAL; |
| 44 | |
| 45 | algp = RTA_DATA(rt); |
Herbert Xu | 31c2685 | 2005-05-19 12:39:49 -0700 | [diff] [blame] | 46 | |
| 47 | len -= (algp->alg_key_len + 7U) / 8; |
| 48 | if (len < 0) |
| 49 | return -EINVAL; |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | switch (type) { |
| 52 | case XFRMA_ALG_AUTH: |
| 53 | if (!algp->alg_key_len && |
| 54 | strcmp(algp->alg_name, "digest_null") != 0) |
| 55 | return -EINVAL; |
| 56 | break; |
| 57 | |
| 58 | case XFRMA_ALG_CRYPT: |
| 59 | if (!algp->alg_key_len && |
| 60 | strcmp(algp->alg_name, "cipher_null") != 0) |
| 61 | return -EINVAL; |
| 62 | break; |
| 63 | |
| 64 | case XFRMA_ALG_COMP: |
| 65 | /* Zero length keys are legal. */ |
| 66 | break; |
| 67 | |
| 68 | default: |
| 69 | return -EINVAL; |
| 70 | }; |
| 71 | |
| 72 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | static int verify_encap_tmpl(struct rtattr **xfrma) |
| 77 | { |
| 78 | struct rtattr *rt = xfrma[XFRMA_ENCAP - 1]; |
| 79 | struct xfrm_encap_tmpl *encap; |
| 80 | |
| 81 | if (!rt) |
| 82 | return 0; |
| 83 | |
| 84 | if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap)) |
| 85 | return -EINVAL; |
| 86 | |
| 87 | return 0; |
| 88 | } |
| 89 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 90 | |
| 91 | static inline int verify_sec_ctx_len(struct rtattr **xfrma) |
| 92 | { |
| 93 | struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1]; |
| 94 | struct xfrm_user_sec_ctx *uctx; |
| 95 | int len = 0; |
| 96 | |
| 97 | if (!rt) |
| 98 | return 0; |
| 99 | |
| 100 | if (rt->rta_len < sizeof(*uctx)) |
| 101 | return -EINVAL; |
| 102 | |
| 103 | uctx = RTA_DATA(rt); |
| 104 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 105 | len += sizeof(struct xfrm_user_sec_ctx); |
| 106 | len += uctx->ctx_len; |
| 107 | |
| 108 | if (uctx->len != len) |
| 109 | return -EINVAL; |
| 110 | |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | static int verify_newsa_info(struct xfrm_usersa_info *p, |
| 116 | struct rtattr **xfrma) |
| 117 | { |
| 118 | int err; |
| 119 | |
| 120 | err = -EINVAL; |
| 121 | switch (p->family) { |
| 122 | case AF_INET: |
| 123 | break; |
| 124 | |
| 125 | case AF_INET6: |
| 126 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 127 | break; |
| 128 | #else |
| 129 | err = -EAFNOSUPPORT; |
| 130 | goto out; |
| 131 | #endif |
| 132 | |
| 133 | default: |
| 134 | goto out; |
| 135 | }; |
| 136 | |
| 137 | err = -EINVAL; |
| 138 | switch (p->id.proto) { |
| 139 | case IPPROTO_AH: |
| 140 | if (!xfrma[XFRMA_ALG_AUTH-1] || |
| 141 | xfrma[XFRMA_ALG_CRYPT-1] || |
| 142 | xfrma[XFRMA_ALG_COMP-1]) |
| 143 | goto out; |
| 144 | break; |
| 145 | |
| 146 | case IPPROTO_ESP: |
| 147 | if ((!xfrma[XFRMA_ALG_AUTH-1] && |
| 148 | !xfrma[XFRMA_ALG_CRYPT-1]) || |
| 149 | xfrma[XFRMA_ALG_COMP-1]) |
| 150 | goto out; |
| 151 | break; |
| 152 | |
| 153 | case IPPROTO_COMP: |
| 154 | if (!xfrma[XFRMA_ALG_COMP-1] || |
| 155 | xfrma[XFRMA_ALG_AUTH-1] || |
| 156 | xfrma[XFRMA_ALG_CRYPT-1]) |
| 157 | goto out; |
| 158 | break; |
| 159 | |
| 160 | default: |
| 161 | goto out; |
| 162 | }; |
| 163 | |
| 164 | if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH))) |
| 165 | goto out; |
| 166 | if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT))) |
| 167 | goto out; |
| 168 | if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP))) |
| 169 | goto out; |
| 170 | if ((err = verify_encap_tmpl(xfrma))) |
| 171 | goto out; |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 172 | if ((err = verify_sec_ctx_len(xfrma))) |
| 173 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
| 175 | err = -EINVAL; |
| 176 | switch (p->mode) { |
| 177 | case 0: |
| 178 | case 1: |
| 179 | break; |
| 180 | |
| 181 | default: |
| 182 | goto out; |
| 183 | }; |
| 184 | |
| 185 | err = 0; |
| 186 | |
| 187 | out: |
| 188 | return err; |
| 189 | } |
| 190 | |
| 191 | static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, |
| 192 | struct xfrm_algo_desc *(*get_byname)(char *, int), |
| 193 | struct rtattr *u_arg) |
| 194 | { |
| 195 | struct rtattr *rta = u_arg; |
| 196 | struct xfrm_algo *p, *ualg; |
| 197 | struct xfrm_algo_desc *algo; |
Herbert Xu | b9e9dea | 2005-05-19 12:39:04 -0700 | [diff] [blame] | 198 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
| 200 | if (!rta) |
| 201 | return 0; |
| 202 | |
| 203 | ualg = RTA_DATA(rta); |
| 204 | |
| 205 | algo = get_byname(ualg->alg_name, 1); |
| 206 | if (!algo) |
| 207 | return -ENOSYS; |
| 208 | *props = algo->desc.sadb_alg_id; |
| 209 | |
Herbert Xu | b9e9dea | 2005-05-19 12:39:04 -0700 | [diff] [blame] | 210 | len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8; |
| 211 | p = kmalloc(len, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | if (!p) |
| 213 | return -ENOMEM; |
| 214 | |
Herbert Xu | b9e9dea | 2005-05-19 12:39:04 -0700 | [diff] [blame] | 215 | memcpy(p, ualg, len); |
Herbert Xu | 04ff126 | 2006-08-13 08:50:00 +1000 | [diff] [blame] | 216 | strcpy(p->alg_name, algo->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | *algpp = p; |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg) |
| 222 | { |
| 223 | struct rtattr *rta = u_arg; |
| 224 | struct xfrm_encap_tmpl *p, *uencap; |
| 225 | |
| 226 | if (!rta) |
| 227 | return 0; |
| 228 | |
| 229 | uencap = RTA_DATA(rta); |
| 230 | p = kmalloc(sizeof(*p), GFP_KERNEL); |
| 231 | if (!p) |
| 232 | return -ENOMEM; |
| 233 | |
| 234 | memcpy(p, uencap, sizeof(*p)); |
| 235 | *encapp = p; |
| 236 | return 0; |
| 237 | } |
| 238 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 239 | |
| 240 | static inline int xfrm_user_sec_ctx_size(struct xfrm_policy *xp) |
| 241 | { |
| 242 | struct xfrm_sec_ctx *xfrm_ctx = xp->security; |
| 243 | int len = 0; |
| 244 | |
| 245 | if (xfrm_ctx) { |
| 246 | len += sizeof(struct xfrm_user_sec_ctx); |
| 247 | len += xfrm_ctx->ctx_len; |
| 248 | } |
| 249 | return len; |
| 250 | } |
| 251 | |
| 252 | static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg) |
| 253 | { |
| 254 | struct xfrm_user_sec_ctx *uctx; |
| 255 | |
| 256 | if (!u_arg) |
| 257 | return 0; |
| 258 | |
| 259 | uctx = RTA_DATA(u_arg); |
| 260 | return security_xfrm_state_alloc(x, uctx); |
| 261 | } |
| 262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) |
| 264 | { |
| 265 | memcpy(&x->id, &p->id, sizeof(x->id)); |
| 266 | memcpy(&x->sel, &p->sel, sizeof(x->sel)); |
| 267 | memcpy(&x->lft, &p->lft, sizeof(x->lft)); |
| 268 | x->props.mode = p->mode; |
| 269 | x->props.replay_window = p->replay_window; |
| 270 | x->props.reqid = p->reqid; |
| 271 | x->props.family = p->family; |
| 272 | x->props.saddr = p->saddr; |
| 273 | x->props.flags = p->flags; |
| 274 | } |
| 275 | |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 276 | /* |
| 277 | * someday when pfkey also has support, we could have the code |
| 278 | * somehow made shareable and move it to xfrm_state.c - JHS |
| 279 | * |
| 280 | */ |
| 281 | static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma) |
| 282 | { |
| 283 | int err = - EINVAL; |
| 284 | struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1]; |
| 285 | struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1]; |
| 286 | struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1]; |
| 287 | struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1]; |
| 288 | |
| 289 | if (rp) { |
| 290 | struct xfrm_replay_state *replay; |
| 291 | if (RTA_PAYLOAD(rp) < sizeof(*replay)) |
| 292 | goto error; |
| 293 | replay = RTA_DATA(rp); |
| 294 | memcpy(&x->replay, replay, sizeof(*replay)); |
| 295 | memcpy(&x->preplay, replay, sizeof(*replay)); |
| 296 | } |
| 297 | |
| 298 | if (lt) { |
| 299 | struct xfrm_lifetime_cur *ltime; |
| 300 | if (RTA_PAYLOAD(lt) < sizeof(*ltime)) |
| 301 | goto error; |
| 302 | ltime = RTA_DATA(lt); |
| 303 | x->curlft.bytes = ltime->bytes; |
| 304 | x->curlft.packets = ltime->packets; |
| 305 | x->curlft.add_time = ltime->add_time; |
| 306 | x->curlft.use_time = ltime->use_time; |
| 307 | } |
| 308 | |
| 309 | if (et) { |
| 310 | if (RTA_PAYLOAD(et) < sizeof(u32)) |
| 311 | goto error; |
| 312 | x->replay_maxage = *(u32*)RTA_DATA(et); |
| 313 | } |
| 314 | |
| 315 | if (rt) { |
| 316 | if (RTA_PAYLOAD(rt) < sizeof(u32)) |
| 317 | goto error; |
| 318 | x->replay_maxdiff = *(u32*)RTA_DATA(rt); |
| 319 | } |
| 320 | |
| 321 | return 0; |
| 322 | error: |
| 323 | return err; |
| 324 | } |
| 325 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p, |
| 327 | struct rtattr **xfrma, |
| 328 | int *errp) |
| 329 | { |
| 330 | struct xfrm_state *x = xfrm_state_alloc(); |
| 331 | int err = -ENOMEM; |
| 332 | |
| 333 | if (!x) |
| 334 | goto error_no_put; |
| 335 | |
| 336 | copy_from_user_state(x, p); |
| 337 | |
| 338 | if ((err = attach_one_algo(&x->aalg, &x->props.aalgo, |
| 339 | xfrm_aalg_get_byname, |
| 340 | xfrma[XFRMA_ALG_AUTH-1]))) |
| 341 | goto error; |
| 342 | if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, |
| 343 | xfrm_ealg_get_byname, |
| 344 | xfrma[XFRMA_ALG_CRYPT-1]))) |
| 345 | goto error; |
| 346 | if ((err = attach_one_algo(&x->calg, &x->props.calgo, |
| 347 | xfrm_calg_get_byname, |
| 348 | xfrma[XFRMA_ALG_COMP-1]))) |
| 349 | goto error; |
| 350 | if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1]))) |
| 351 | goto error; |
| 352 | |
Herbert Xu | 72cb696 | 2005-06-20 13:18:08 -0700 | [diff] [blame] | 353 | err = xfrm_init_state(x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | if (err) |
| 355 | goto error; |
| 356 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 357 | if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1]))) |
| 358 | goto error; |
| 359 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | x->km.seq = p->seq; |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 361 | x->replay_maxdiff = sysctl_xfrm_aevent_rseqth; |
| 362 | /* sysctl_xfrm_aevent_etime is in 100ms units */ |
| 363 | x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M; |
| 364 | x->preplay.bitmap = 0; |
| 365 | x->preplay.seq = x->replay.seq+x->replay_maxdiff; |
| 366 | x->preplay.oseq = x->replay.oseq +x->replay_maxdiff; |
| 367 | |
| 368 | /* override default values from above */ |
| 369 | |
| 370 | err = xfrm_update_ae_params(x, (struct rtattr **)xfrma); |
| 371 | if (err < 0) |
| 372 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
| 374 | return x; |
| 375 | |
| 376 | error: |
| 377 | x->km.state = XFRM_STATE_DEAD; |
| 378 | xfrm_state_put(x); |
| 379 | error_no_put: |
| 380 | *errp = err; |
| 381 | return NULL; |
| 382 | } |
| 383 | |
| 384 | static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
| 385 | { |
| 386 | struct xfrm_usersa_info *p = NLMSG_DATA(nlh); |
| 387 | struct xfrm_state *x; |
| 388 | int err; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 389 | struct km_event c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 391 | err = verify_newsa_info(p, (struct rtattr **)xfrma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | if (err) |
| 393 | return err; |
| 394 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 395 | x = xfrm_state_construct(p, (struct rtattr **)xfrma, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | if (!x) |
| 397 | return err; |
| 398 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 399 | xfrm_state_hold(x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | if (nlh->nlmsg_type == XFRM_MSG_NEWSA) |
| 401 | err = xfrm_state_add(x); |
| 402 | else |
| 403 | err = xfrm_state_update(x); |
| 404 | |
| 405 | if (err < 0) { |
| 406 | x->km.state = XFRM_STATE_DEAD; |
Herbert Xu | 21380b8 | 2006-02-22 14:47:13 -0800 | [diff] [blame] | 407 | __xfrm_state_put(x); |
Patrick McHardy | 7d6dfe1 | 2005-06-18 22:45:31 -0700 | [diff] [blame] | 408 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | } |
| 410 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 411 | c.seq = nlh->nlmsg_seq; |
| 412 | c.pid = nlh->nlmsg_pid; |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 413 | c.event = nlh->nlmsg_type; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 414 | |
| 415 | km_state_notify(x, &c); |
Patrick McHardy | 7d6dfe1 | 2005-06-18 22:45:31 -0700 | [diff] [blame] | 416 | out: |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 417 | xfrm_state_put(x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | return err; |
| 419 | } |
| 420 | |
| 421 | static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
| 422 | { |
| 423 | struct xfrm_state *x; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 424 | int err; |
| 425 | struct km_event c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | struct xfrm_usersa_id *p = NLMSG_DATA(nlh); |
| 427 | |
| 428 | x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family); |
| 429 | if (x == NULL) |
| 430 | return -ESRCH; |
| 431 | |
David S. Miller | 6f68dc3 | 2006-06-08 23:58:52 -0700 | [diff] [blame] | 432 | if ((err = security_xfrm_state_delete(x)) != 0) |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 433 | goto out; |
| 434 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | if (xfrm_state_kern(x)) { |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 436 | err = -EPERM; |
| 437 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | } |
| 439 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 440 | err = xfrm_state_delete(x); |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 441 | if (err < 0) |
| 442 | goto out; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 443 | |
| 444 | c.seq = nlh->nlmsg_seq; |
| 445 | c.pid = nlh->nlmsg_pid; |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 446 | c.event = nlh->nlmsg_type; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 447 | km_state_notify(x, &c); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 449 | out: |
| 450 | xfrm_state_put(x); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 451 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) |
| 455 | { |
| 456 | memcpy(&p->id, &x->id, sizeof(p->id)); |
| 457 | memcpy(&p->sel, &x->sel, sizeof(p->sel)); |
| 458 | memcpy(&p->lft, &x->lft, sizeof(p->lft)); |
| 459 | memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); |
| 460 | memcpy(&p->stats, &x->stats, sizeof(p->stats)); |
| 461 | p->saddr = x->props.saddr; |
| 462 | p->mode = x->props.mode; |
| 463 | p->replay_window = x->props.replay_window; |
| 464 | p->reqid = x->props.reqid; |
| 465 | p->family = x->props.family; |
| 466 | p->flags = x->props.flags; |
| 467 | p->seq = x->km.seq; |
| 468 | } |
| 469 | |
| 470 | struct xfrm_dump_info { |
| 471 | struct sk_buff *in_skb; |
| 472 | struct sk_buff *out_skb; |
| 473 | u32 nlmsg_seq; |
| 474 | u16 nlmsg_flags; |
| 475 | int start_idx; |
| 476 | int this_idx; |
| 477 | }; |
| 478 | |
| 479 | static int dump_one_state(struct xfrm_state *x, int count, void *ptr) |
| 480 | { |
| 481 | struct xfrm_dump_info *sp = ptr; |
| 482 | struct sk_buff *in_skb = sp->in_skb; |
| 483 | struct sk_buff *skb = sp->out_skb; |
| 484 | struct xfrm_usersa_info *p; |
| 485 | struct nlmsghdr *nlh; |
| 486 | unsigned char *b = skb->tail; |
| 487 | |
| 488 | if (sp->this_idx < sp->start_idx) |
| 489 | goto out; |
| 490 | |
| 491 | nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, |
| 492 | sp->nlmsg_seq, |
| 493 | XFRM_MSG_NEWSA, sizeof(*p)); |
| 494 | nlh->nlmsg_flags = sp->nlmsg_flags; |
| 495 | |
| 496 | p = NLMSG_DATA(nlh); |
| 497 | copy_to_user_state(x, p); |
| 498 | |
| 499 | if (x->aalg) |
| 500 | RTA_PUT(skb, XFRMA_ALG_AUTH, |
| 501 | sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg); |
| 502 | if (x->ealg) |
| 503 | RTA_PUT(skb, XFRMA_ALG_CRYPT, |
| 504 | sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg); |
| 505 | if (x->calg) |
| 506 | RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); |
| 507 | |
| 508 | if (x->encap) |
| 509 | RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); |
| 510 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 511 | if (x->security) { |
| 512 | int ctx_size = sizeof(struct xfrm_sec_ctx) + |
| 513 | x->security->ctx_len; |
| 514 | struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size); |
| 515 | struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); |
| 516 | |
| 517 | uctx->exttype = XFRMA_SEC_CTX; |
| 518 | uctx->len = ctx_size; |
| 519 | uctx->ctx_doi = x->security->ctx_doi; |
| 520 | uctx->ctx_alg = x->security->ctx_alg; |
| 521 | uctx->ctx_len = x->security->ctx_len; |
| 522 | memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len); |
| 523 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | nlh->nlmsg_len = skb->tail - b; |
| 525 | out: |
| 526 | sp->this_idx++; |
| 527 | return 0; |
| 528 | |
| 529 | nlmsg_failure: |
| 530 | rtattr_failure: |
| 531 | skb_trim(skb, b - skb->data); |
| 532 | return -1; |
| 533 | } |
| 534 | |
| 535 | static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) |
| 536 | { |
| 537 | struct xfrm_dump_info info; |
| 538 | |
| 539 | info.in_skb = cb->skb; |
| 540 | info.out_skb = skb; |
| 541 | info.nlmsg_seq = cb->nlh->nlmsg_seq; |
| 542 | info.nlmsg_flags = NLM_F_MULTI; |
| 543 | info.this_idx = 0; |
| 544 | info.start_idx = cb->args[0]; |
| 545 | (void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info); |
| 546 | cb->args[0] = info.this_idx; |
| 547 | |
| 548 | return skb->len; |
| 549 | } |
| 550 | |
| 551 | static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, |
| 552 | struct xfrm_state *x, u32 seq) |
| 553 | { |
| 554 | struct xfrm_dump_info info; |
| 555 | struct sk_buff *skb; |
| 556 | |
| 557 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
| 558 | if (!skb) |
| 559 | return ERR_PTR(-ENOMEM); |
| 560 | |
| 561 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; |
| 562 | info.in_skb = in_skb; |
| 563 | info.out_skb = skb; |
| 564 | info.nlmsg_seq = seq; |
| 565 | info.nlmsg_flags = 0; |
| 566 | info.this_idx = info.start_idx = 0; |
| 567 | |
| 568 | if (dump_one_state(x, 0, &info)) { |
| 569 | kfree_skb(skb); |
| 570 | return NULL; |
| 571 | } |
| 572 | |
| 573 | return skb; |
| 574 | } |
| 575 | |
| 576 | static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
| 577 | { |
| 578 | struct xfrm_usersa_id *p = NLMSG_DATA(nlh); |
| 579 | struct xfrm_state *x; |
| 580 | struct sk_buff *resp_skb; |
| 581 | int err; |
| 582 | |
| 583 | x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family); |
| 584 | err = -ESRCH; |
| 585 | if (x == NULL) |
| 586 | goto out_noput; |
| 587 | |
| 588 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); |
| 589 | if (IS_ERR(resp_skb)) { |
| 590 | err = PTR_ERR(resp_skb); |
| 591 | } else { |
| 592 | err = netlink_unicast(xfrm_nl, resp_skb, |
| 593 | NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| 594 | } |
| 595 | xfrm_state_put(x); |
| 596 | out_noput: |
| 597 | return err; |
| 598 | } |
| 599 | |
| 600 | static int verify_userspi_info(struct xfrm_userspi_info *p) |
| 601 | { |
| 602 | switch (p->info.id.proto) { |
| 603 | case IPPROTO_AH: |
| 604 | case IPPROTO_ESP: |
| 605 | break; |
| 606 | |
| 607 | case IPPROTO_COMP: |
| 608 | /* IPCOMP spi is 16-bits. */ |
| 609 | if (p->max >= 0x10000) |
| 610 | return -EINVAL; |
| 611 | break; |
| 612 | |
| 613 | default: |
| 614 | return -EINVAL; |
| 615 | }; |
| 616 | |
| 617 | if (p->min > p->max) |
| 618 | return -EINVAL; |
| 619 | |
| 620 | return 0; |
| 621 | } |
| 622 | |
| 623 | static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
| 624 | { |
| 625 | struct xfrm_state *x; |
| 626 | struct xfrm_userspi_info *p; |
| 627 | struct sk_buff *resp_skb; |
| 628 | xfrm_address_t *daddr; |
| 629 | int family; |
| 630 | int err; |
| 631 | |
| 632 | p = NLMSG_DATA(nlh); |
| 633 | err = verify_userspi_info(p); |
| 634 | if (err) |
| 635 | goto out_noput; |
| 636 | |
| 637 | family = p->info.family; |
| 638 | daddr = &p->info.id.daddr; |
| 639 | |
| 640 | x = NULL; |
| 641 | if (p->info.seq) { |
| 642 | x = xfrm_find_acq_byseq(p->info.seq); |
| 643 | if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { |
| 644 | xfrm_state_put(x); |
| 645 | x = NULL; |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | if (!x) |
| 650 | x = xfrm_find_acq(p->info.mode, p->info.reqid, |
| 651 | p->info.id.proto, daddr, |
| 652 | &p->info.saddr, 1, |
| 653 | family); |
| 654 | err = -ENOENT; |
| 655 | if (x == NULL) |
| 656 | goto out_noput; |
| 657 | |
| 658 | resp_skb = ERR_PTR(-ENOENT); |
| 659 | |
| 660 | spin_lock_bh(&x->lock); |
| 661 | if (x->km.state != XFRM_STATE_DEAD) { |
| 662 | xfrm_alloc_spi(x, htonl(p->min), htonl(p->max)); |
| 663 | if (x->id.spi) |
| 664 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); |
| 665 | } |
| 666 | spin_unlock_bh(&x->lock); |
| 667 | |
| 668 | if (IS_ERR(resp_skb)) { |
| 669 | err = PTR_ERR(resp_skb); |
| 670 | goto out; |
| 671 | } |
| 672 | |
| 673 | err = netlink_unicast(xfrm_nl, resp_skb, |
| 674 | NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| 675 | |
| 676 | out: |
| 677 | xfrm_state_put(x); |
| 678 | out_noput: |
| 679 | return err; |
| 680 | } |
| 681 | |
| 682 | static int verify_policy_dir(__u8 dir) |
| 683 | { |
| 684 | switch (dir) { |
| 685 | case XFRM_POLICY_IN: |
| 686 | case XFRM_POLICY_OUT: |
| 687 | case XFRM_POLICY_FWD: |
| 688 | break; |
| 689 | |
| 690 | default: |
| 691 | return -EINVAL; |
| 692 | }; |
| 693 | |
| 694 | return 0; |
| 695 | } |
| 696 | |
| 697 | static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) |
| 698 | { |
| 699 | switch (p->share) { |
| 700 | case XFRM_SHARE_ANY: |
| 701 | case XFRM_SHARE_SESSION: |
| 702 | case XFRM_SHARE_USER: |
| 703 | case XFRM_SHARE_UNIQUE: |
| 704 | break; |
| 705 | |
| 706 | default: |
| 707 | return -EINVAL; |
| 708 | }; |
| 709 | |
| 710 | switch (p->action) { |
| 711 | case XFRM_POLICY_ALLOW: |
| 712 | case XFRM_POLICY_BLOCK: |
| 713 | break; |
| 714 | |
| 715 | default: |
| 716 | return -EINVAL; |
| 717 | }; |
| 718 | |
| 719 | switch (p->sel.family) { |
| 720 | case AF_INET: |
| 721 | break; |
| 722 | |
| 723 | case AF_INET6: |
| 724 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 725 | break; |
| 726 | #else |
| 727 | return -EAFNOSUPPORT; |
| 728 | #endif |
| 729 | |
| 730 | default: |
| 731 | return -EINVAL; |
| 732 | }; |
| 733 | |
| 734 | return verify_policy_dir(p->dir); |
| 735 | } |
| 736 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 737 | static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma) |
| 738 | { |
| 739 | struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1]; |
| 740 | struct xfrm_user_sec_ctx *uctx; |
| 741 | |
| 742 | if (!rt) |
| 743 | return 0; |
| 744 | |
| 745 | uctx = RTA_DATA(rt); |
| 746 | return security_xfrm_policy_alloc(pol, uctx); |
| 747 | } |
| 748 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, |
| 750 | int nr) |
| 751 | { |
| 752 | int i; |
| 753 | |
| 754 | xp->xfrm_nr = nr; |
| 755 | for (i = 0; i < nr; i++, ut++) { |
| 756 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; |
| 757 | |
| 758 | memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); |
| 759 | memcpy(&t->saddr, &ut->saddr, |
| 760 | sizeof(xfrm_address_t)); |
| 761 | t->reqid = ut->reqid; |
| 762 | t->mode = ut->mode; |
| 763 | t->share = ut->share; |
| 764 | t->optional = ut->optional; |
| 765 | t->aalgos = ut->aalgos; |
| 766 | t->ealgos = ut->ealgos; |
| 767 | t->calgos = ut->calgos; |
| 768 | } |
| 769 | } |
| 770 | |
| 771 | static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma) |
| 772 | { |
| 773 | struct rtattr *rt = xfrma[XFRMA_TMPL-1]; |
| 774 | struct xfrm_user_tmpl *utmpl; |
| 775 | int nr; |
| 776 | |
| 777 | if (!rt) { |
| 778 | pol->xfrm_nr = 0; |
| 779 | } else { |
| 780 | nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl); |
| 781 | |
| 782 | if (nr > XFRM_MAX_DEPTH) |
| 783 | return -EINVAL; |
| 784 | |
| 785 | copy_templates(pol, RTA_DATA(rt), nr); |
| 786 | } |
| 787 | return 0; |
| 788 | } |
| 789 | |
| 790 | static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) |
| 791 | { |
| 792 | xp->priority = p->priority; |
| 793 | xp->index = p->index; |
| 794 | memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); |
| 795 | memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); |
| 796 | xp->action = p->action; |
| 797 | xp->flags = p->flags; |
| 798 | xp->family = p->sel.family; |
| 799 | /* XXX xp->share = p->share; */ |
| 800 | } |
| 801 | |
| 802 | static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) |
| 803 | { |
| 804 | memcpy(&p->sel, &xp->selector, sizeof(p->sel)); |
| 805 | memcpy(&p->lft, &xp->lft, sizeof(p->lft)); |
| 806 | memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); |
| 807 | p->priority = xp->priority; |
| 808 | p->index = xp->index; |
| 809 | p->sel.family = xp->family; |
| 810 | p->dir = dir; |
| 811 | p->action = xp->action; |
| 812 | p->flags = xp->flags; |
| 813 | p->share = XFRM_SHARE_ANY; /* XXX xp->share */ |
| 814 | } |
| 815 | |
| 816 | static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp) |
| 817 | { |
| 818 | struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL); |
| 819 | int err; |
| 820 | |
| 821 | if (!xp) { |
| 822 | *errp = -ENOMEM; |
| 823 | return NULL; |
| 824 | } |
| 825 | |
| 826 | copy_from_user_policy(xp, p); |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 827 | |
| 828 | if (!(err = copy_from_user_tmpl(xp, xfrma))) |
| 829 | err = copy_from_user_sec_ctx(xp, xfrma); |
| 830 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | if (err) { |
| 832 | *errp = err; |
| 833 | kfree(xp); |
| 834 | xp = NULL; |
| 835 | } |
| 836 | |
| 837 | return xp; |
| 838 | } |
| 839 | |
| 840 | static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
| 841 | { |
| 842 | struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh); |
| 843 | struct xfrm_policy *xp; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 844 | struct km_event c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | int err; |
| 846 | int excl; |
| 847 | |
| 848 | err = verify_newpolicy_info(p); |
| 849 | if (err) |
| 850 | return err; |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 851 | err = verify_sec_ctx_len((struct rtattr **)xfrma); |
| 852 | if (err) |
| 853 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 855 | xp = xfrm_policy_construct(p, (struct rtattr **)xfrma, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | if (!xp) |
| 857 | return err; |
| 858 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 859 | /* shouldnt excl be based on nlh flags?? |
| 860 | * Aha! this is anti-netlink really i.e more pfkey derived |
| 861 | * in netlink excl is a flag and you wouldnt need |
| 862 | * a type XFRM_MSG_UPDPOLICY - JHS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; |
| 864 | err = xfrm_policy_insert(p->dir, xp, excl); |
| 865 | if (err) { |
Trent Jaeger | 5f8ac64 | 2006-01-06 13:22:39 -0800 | [diff] [blame] | 866 | security_xfrm_policy_free(xp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | kfree(xp); |
| 868 | return err; |
| 869 | } |
| 870 | |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 871 | c.event = nlh->nlmsg_type; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 872 | c.seq = nlh->nlmsg_seq; |
| 873 | c.pid = nlh->nlmsg_pid; |
| 874 | km_policy_notify(xp, p->dir, &c); |
| 875 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | xfrm_pol_put(xp); |
| 877 | |
| 878 | return 0; |
| 879 | } |
| 880 | |
| 881 | static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) |
| 882 | { |
| 883 | struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; |
| 884 | int i; |
| 885 | |
| 886 | if (xp->xfrm_nr == 0) |
| 887 | return 0; |
| 888 | |
| 889 | for (i = 0; i < xp->xfrm_nr; i++) { |
| 890 | struct xfrm_user_tmpl *up = &vec[i]; |
| 891 | struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; |
| 892 | |
| 893 | memcpy(&up->id, &kp->id, sizeof(up->id)); |
| 894 | up->family = xp->family; |
| 895 | memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); |
| 896 | up->reqid = kp->reqid; |
| 897 | up->mode = kp->mode; |
| 898 | up->share = kp->share; |
| 899 | up->optional = kp->optional; |
| 900 | up->aalgos = kp->aalgos; |
| 901 | up->ealgos = kp->ealgos; |
| 902 | up->calgos = kp->calgos; |
| 903 | } |
| 904 | RTA_PUT(skb, XFRMA_TMPL, |
| 905 | (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr), |
| 906 | vec); |
| 907 | |
| 908 | return 0; |
| 909 | |
| 910 | rtattr_failure: |
| 911 | return -1; |
| 912 | } |
| 913 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 914 | static int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) |
| 915 | { |
| 916 | if (xp->security) { |
| 917 | int ctx_size = sizeof(struct xfrm_sec_ctx) + |
| 918 | xp->security->ctx_len; |
| 919 | struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size); |
| 920 | struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); |
| 921 | |
| 922 | uctx->exttype = XFRMA_SEC_CTX; |
| 923 | uctx->len = ctx_size; |
| 924 | uctx->ctx_doi = xp->security->ctx_doi; |
| 925 | uctx->ctx_alg = xp->security->ctx_alg; |
| 926 | uctx->ctx_len = xp->security->ctx_len; |
| 927 | memcpy(uctx + 1, xp->security->ctx_str, xp->security->ctx_len); |
| 928 | } |
| 929 | return 0; |
| 930 | |
| 931 | rtattr_failure: |
| 932 | return -1; |
| 933 | } |
| 934 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) |
| 936 | { |
| 937 | struct xfrm_dump_info *sp = ptr; |
| 938 | struct xfrm_userpolicy_info *p; |
| 939 | struct sk_buff *in_skb = sp->in_skb; |
| 940 | struct sk_buff *skb = sp->out_skb; |
| 941 | struct nlmsghdr *nlh; |
| 942 | unsigned char *b = skb->tail; |
| 943 | |
| 944 | if (sp->this_idx < sp->start_idx) |
| 945 | goto out; |
| 946 | |
| 947 | nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, |
| 948 | sp->nlmsg_seq, |
| 949 | XFRM_MSG_NEWPOLICY, sizeof(*p)); |
| 950 | p = NLMSG_DATA(nlh); |
| 951 | nlh->nlmsg_flags = sp->nlmsg_flags; |
| 952 | |
| 953 | copy_to_user_policy(xp, p, dir); |
| 954 | if (copy_to_user_tmpl(xp, skb) < 0) |
| 955 | goto nlmsg_failure; |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 956 | if (copy_to_user_sec_ctx(xp, skb)) |
| 957 | goto nlmsg_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | |
| 959 | nlh->nlmsg_len = skb->tail - b; |
| 960 | out: |
| 961 | sp->this_idx++; |
| 962 | return 0; |
| 963 | |
| 964 | nlmsg_failure: |
| 965 | skb_trim(skb, b - skb->data); |
| 966 | return -1; |
| 967 | } |
| 968 | |
| 969 | static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) |
| 970 | { |
| 971 | struct xfrm_dump_info info; |
| 972 | |
| 973 | info.in_skb = cb->skb; |
| 974 | info.out_skb = skb; |
| 975 | info.nlmsg_seq = cb->nlh->nlmsg_seq; |
| 976 | info.nlmsg_flags = NLM_F_MULTI; |
| 977 | info.this_idx = 0; |
| 978 | info.start_idx = cb->args[0]; |
| 979 | (void) xfrm_policy_walk(dump_one_policy, &info); |
| 980 | cb->args[0] = info.this_idx; |
| 981 | |
| 982 | return skb->len; |
| 983 | } |
| 984 | |
| 985 | static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, |
| 986 | struct xfrm_policy *xp, |
| 987 | int dir, u32 seq) |
| 988 | { |
| 989 | struct xfrm_dump_info info; |
| 990 | struct sk_buff *skb; |
| 991 | |
| 992 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 993 | if (!skb) |
| 994 | return ERR_PTR(-ENOMEM); |
| 995 | |
| 996 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; |
| 997 | info.in_skb = in_skb; |
| 998 | info.out_skb = skb; |
| 999 | info.nlmsg_seq = seq; |
| 1000 | info.nlmsg_flags = 0; |
| 1001 | info.this_idx = info.start_idx = 0; |
| 1002 | |
| 1003 | if (dump_one_policy(xp, dir, 0, &info) < 0) { |
| 1004 | kfree_skb(skb); |
| 1005 | return NULL; |
| 1006 | } |
| 1007 | |
| 1008 | return skb; |
| 1009 | } |
| 1010 | |
| 1011 | static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
| 1012 | { |
| 1013 | struct xfrm_policy *xp; |
| 1014 | struct xfrm_userpolicy_id *p; |
| 1015 | int err; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1016 | struct km_event c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | int delete; |
| 1018 | |
| 1019 | p = NLMSG_DATA(nlh); |
| 1020 | delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; |
| 1021 | |
| 1022 | err = verify_policy_dir(p->dir); |
| 1023 | if (err) |
| 1024 | return err; |
| 1025 | |
| 1026 | if (p->index) |
| 1027 | xp = xfrm_policy_byid(p->dir, p->index, delete); |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1028 | else { |
| 1029 | struct rtattr **rtattrs = (struct rtattr **)xfrma; |
| 1030 | struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1]; |
| 1031 | struct xfrm_policy tmp; |
| 1032 | |
| 1033 | err = verify_sec_ctx_len(rtattrs); |
| 1034 | if (err) |
| 1035 | return err; |
| 1036 | |
| 1037 | memset(&tmp, 0, sizeof(struct xfrm_policy)); |
| 1038 | if (rt) { |
| 1039 | struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); |
| 1040 | |
| 1041 | if ((err = security_xfrm_policy_alloc(&tmp, uctx))) |
| 1042 | return err; |
| 1043 | } |
| 1044 | xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, delete); |
| 1045 | security_xfrm_policy_free(&tmp); |
| 1046 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | if (xp == NULL) |
| 1048 | return -ENOENT; |
| 1049 | |
| 1050 | if (!delete) { |
| 1051 | struct sk_buff *resp_skb; |
| 1052 | |
| 1053 | resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); |
| 1054 | if (IS_ERR(resp_skb)) { |
| 1055 | err = PTR_ERR(resp_skb); |
| 1056 | } else { |
| 1057 | err = netlink_unicast(xfrm_nl, resp_skb, |
| 1058 | NETLINK_CB(skb).pid, |
| 1059 | MSG_DONTWAIT); |
| 1060 | } |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1061 | } else { |
David S. Miller | 6f68dc3 | 2006-06-08 23:58:52 -0700 | [diff] [blame] | 1062 | if ((err = security_xfrm_policy_delete(xp)) != 0) |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 1063 | goto out; |
Herbert Xu | e744389 | 2005-06-18 22:44:18 -0700 | [diff] [blame] | 1064 | c.data.byid = p->index; |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 1065 | c.event = nlh->nlmsg_type; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1066 | c.seq = nlh->nlmsg_seq; |
| 1067 | c.pid = nlh->nlmsg_pid; |
| 1068 | km_policy_notify(xp, p->dir, &c); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | } |
| 1070 | |
| 1071 | xfrm_pol_put(xp); |
| 1072 | |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 1073 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | return err; |
| 1075 | } |
| 1076 | |
| 1077 | static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
| 1078 | { |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1079 | struct km_event c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | struct xfrm_usersa_flush *p = NLMSG_DATA(nlh); |
| 1081 | |
| 1082 | xfrm_state_flush(p->proto); |
Herbert Xu | bf08867 | 2005-06-18 22:44:00 -0700 | [diff] [blame] | 1083 | c.data.proto = p->proto; |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 1084 | c.event = nlh->nlmsg_type; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1085 | c.seq = nlh->nlmsg_seq; |
| 1086 | c.pid = nlh->nlmsg_pid; |
| 1087 | km_state_notify(NULL, &c); |
| 1088 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | return 0; |
| 1090 | } |
| 1091 | |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1092 | |
| 1093 | static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) |
| 1094 | { |
| 1095 | struct xfrm_aevent_id *id; |
| 1096 | struct nlmsghdr *nlh; |
| 1097 | struct xfrm_lifetime_cur ltime; |
| 1098 | unsigned char *b = skb->tail; |
| 1099 | |
| 1100 | nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id)); |
| 1101 | id = NLMSG_DATA(nlh); |
| 1102 | nlh->nlmsg_flags = 0; |
| 1103 | |
| 1104 | id->sa_id.daddr = x->id.daddr; |
| 1105 | id->sa_id.spi = x->id.spi; |
| 1106 | id->sa_id.family = x->props.family; |
| 1107 | id->sa_id.proto = x->id.proto; |
| 1108 | id->flags = c->data.aevent; |
| 1109 | |
| 1110 | RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay); |
| 1111 | |
| 1112 | ltime.bytes = x->curlft.bytes; |
| 1113 | ltime.packets = x->curlft.packets; |
| 1114 | ltime.add_time = x->curlft.add_time; |
| 1115 | ltime.use_time = x->curlft.use_time; |
| 1116 | |
| 1117 | RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), <ime); |
| 1118 | |
| 1119 | if (id->flags&XFRM_AE_RTHR) { |
| 1120 | RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff); |
| 1121 | } |
| 1122 | |
| 1123 | if (id->flags&XFRM_AE_ETHR) { |
| 1124 | u32 etimer = x->replay_maxage*10/HZ; |
| 1125 | RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer); |
| 1126 | } |
| 1127 | |
| 1128 | nlh->nlmsg_len = skb->tail - b; |
| 1129 | return skb->len; |
| 1130 | |
| 1131 | rtattr_failure: |
| 1132 | nlmsg_failure: |
| 1133 | skb_trim(skb, b - skb->data); |
| 1134 | return -1; |
| 1135 | } |
| 1136 | |
| 1137 | static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
| 1138 | { |
| 1139 | struct xfrm_state *x; |
| 1140 | struct sk_buff *r_skb; |
| 1141 | int err; |
| 1142 | struct km_event c; |
| 1143 | struct xfrm_aevent_id *p = NLMSG_DATA(nlh); |
| 1144 | int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id)); |
| 1145 | struct xfrm_usersa_id *id = &p->sa_id; |
| 1146 | |
| 1147 | len += RTA_SPACE(sizeof(struct xfrm_replay_state)); |
| 1148 | len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur)); |
| 1149 | |
| 1150 | if (p->flags&XFRM_AE_RTHR) |
| 1151 | len+=RTA_SPACE(sizeof(u32)); |
| 1152 | |
| 1153 | if (p->flags&XFRM_AE_ETHR) |
| 1154 | len+=RTA_SPACE(sizeof(u32)); |
| 1155 | |
| 1156 | r_skb = alloc_skb(len, GFP_ATOMIC); |
| 1157 | if (r_skb == NULL) |
| 1158 | return -ENOMEM; |
| 1159 | |
| 1160 | x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family); |
| 1161 | if (x == NULL) { |
| 1162 | kfree(r_skb); |
| 1163 | return -ESRCH; |
| 1164 | } |
| 1165 | |
| 1166 | /* |
| 1167 | * XXX: is this lock really needed - none of the other |
| 1168 | * gets lock (the concern is things getting updated |
| 1169 | * while we are still reading) - jhs |
| 1170 | */ |
| 1171 | spin_lock_bh(&x->lock); |
| 1172 | c.data.aevent = p->flags; |
| 1173 | c.seq = nlh->nlmsg_seq; |
| 1174 | c.pid = nlh->nlmsg_pid; |
| 1175 | |
| 1176 | if (build_aevent(r_skb, x, &c) < 0) |
| 1177 | BUG(); |
| 1178 | err = netlink_unicast(xfrm_nl, r_skb, |
| 1179 | NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| 1180 | spin_unlock_bh(&x->lock); |
| 1181 | xfrm_state_put(x); |
| 1182 | return err; |
| 1183 | } |
| 1184 | |
| 1185 | static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
| 1186 | { |
| 1187 | struct xfrm_state *x; |
| 1188 | struct km_event c; |
| 1189 | int err = - EINVAL; |
| 1190 | struct xfrm_aevent_id *p = NLMSG_DATA(nlh); |
| 1191 | struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1]; |
| 1192 | struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1]; |
| 1193 | |
| 1194 | if (!lt && !rp) |
| 1195 | return err; |
| 1196 | |
| 1197 | /* pedantic mode - thou shalt sayeth replaceth */ |
| 1198 | if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) |
| 1199 | return err; |
| 1200 | |
| 1201 | x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); |
| 1202 | if (x == NULL) |
| 1203 | return -ESRCH; |
| 1204 | |
| 1205 | if (x->km.state != XFRM_STATE_VALID) |
| 1206 | goto out; |
| 1207 | |
| 1208 | spin_lock_bh(&x->lock); |
| 1209 | err = xfrm_update_ae_params(x,(struct rtattr **)xfrma); |
| 1210 | spin_unlock_bh(&x->lock); |
| 1211 | if (err < 0) |
| 1212 | goto out; |
| 1213 | |
| 1214 | c.event = nlh->nlmsg_type; |
| 1215 | c.seq = nlh->nlmsg_seq; |
| 1216 | c.pid = nlh->nlmsg_pid; |
| 1217 | c.data.aevent = XFRM_AE_CU; |
| 1218 | km_state_notify(x, &c); |
| 1219 | err = 0; |
| 1220 | out: |
| 1221 | xfrm_state_put(x); |
| 1222 | return err; |
| 1223 | } |
| 1224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
| 1226 | { |
Jamal Hadi Salim | 6c5c8ca | 2006-03-20 19:17:25 -0800 | [diff] [blame] | 1227 | struct km_event c; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | xfrm_policy_flush(); |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 1230 | c.event = nlh->nlmsg_type; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1231 | c.seq = nlh->nlmsg_seq; |
| 1232 | c.pid = nlh->nlmsg_pid; |
| 1233 | km_policy_notify(NULL, 0, &c); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | return 0; |
| 1235 | } |
| 1236 | |
Jamal Hadi Salim | 6c5c8ca | 2006-03-20 19:17:25 -0800 | [diff] [blame] | 1237 | static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
| 1238 | { |
| 1239 | struct xfrm_policy *xp; |
| 1240 | struct xfrm_user_polexpire *up = NLMSG_DATA(nlh); |
| 1241 | struct xfrm_userpolicy_info *p = &up->pol; |
| 1242 | int err = -ENOENT; |
| 1243 | |
| 1244 | if (p->index) |
| 1245 | xp = xfrm_policy_byid(p->dir, p->index, 0); |
| 1246 | else { |
| 1247 | struct rtattr **rtattrs = (struct rtattr **)xfrma; |
| 1248 | struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1]; |
| 1249 | struct xfrm_policy tmp; |
| 1250 | |
| 1251 | err = verify_sec_ctx_len(rtattrs); |
| 1252 | if (err) |
| 1253 | return err; |
| 1254 | |
| 1255 | memset(&tmp, 0, sizeof(struct xfrm_policy)); |
| 1256 | if (rt) { |
| 1257 | struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); |
| 1258 | |
| 1259 | if ((err = security_xfrm_policy_alloc(&tmp, uctx))) |
| 1260 | return err; |
| 1261 | } |
| 1262 | xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, 0); |
| 1263 | security_xfrm_policy_free(&tmp); |
| 1264 | } |
| 1265 | |
| 1266 | if (xp == NULL) |
| 1267 | return err; |
| 1268 | read_lock(&xp->lock); |
| 1269 | if (xp->dead) { |
| 1270 | read_unlock(&xp->lock); |
| 1271 | goto out; |
| 1272 | } |
| 1273 | |
| 1274 | read_unlock(&xp->lock); |
| 1275 | err = 0; |
| 1276 | if (up->hard) { |
| 1277 | xfrm_policy_delete(xp, p->dir); |
| 1278 | } else { |
| 1279 | // reset the timers here? |
| 1280 | printk("Dont know what to do with soft policy expire\n"); |
| 1281 | } |
| 1282 | km_policy_expired(xp, p->dir, up->hard, current->pid); |
| 1283 | |
| 1284 | out: |
| 1285 | xfrm_pol_put(xp); |
| 1286 | return err; |
| 1287 | } |
| 1288 | |
Jamal Hadi Salim | 53bc6b4 | 2006-03-20 19:17:03 -0800 | [diff] [blame] | 1289 | static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
| 1290 | { |
| 1291 | struct xfrm_state *x; |
| 1292 | int err; |
| 1293 | struct xfrm_user_expire *ue = NLMSG_DATA(nlh); |
| 1294 | struct xfrm_usersa_info *p = &ue->state; |
| 1295 | |
| 1296 | x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family); |
| 1297 | err = -ENOENT; |
| 1298 | |
| 1299 | if (x == NULL) |
| 1300 | return err; |
| 1301 | |
| 1302 | err = -EINVAL; |
| 1303 | |
| 1304 | spin_lock_bh(&x->lock); |
| 1305 | if (x->km.state != XFRM_STATE_VALID) |
| 1306 | goto out; |
| 1307 | km_state_expired(x, ue->hard, current->pid); |
| 1308 | |
| 1309 | if (ue->hard) |
| 1310 | __xfrm_state_delete(x); |
| 1311 | out: |
| 1312 | spin_unlock_bh(&x->lock); |
| 1313 | xfrm_state_put(x); |
| 1314 | return err; |
| 1315 | } |
| 1316 | |
Jamal Hadi Salim | 980ebd2 | 2006-03-20 19:16:40 -0800 | [diff] [blame] | 1317 | static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) |
| 1318 | { |
| 1319 | struct xfrm_policy *xp; |
| 1320 | struct xfrm_user_tmpl *ut; |
| 1321 | int i; |
| 1322 | struct rtattr *rt = xfrma[XFRMA_TMPL-1]; |
| 1323 | |
| 1324 | struct xfrm_user_acquire *ua = NLMSG_DATA(nlh); |
| 1325 | struct xfrm_state *x = xfrm_state_alloc(); |
| 1326 | int err = -ENOMEM; |
| 1327 | |
| 1328 | if (!x) |
| 1329 | return err; |
| 1330 | |
| 1331 | err = verify_newpolicy_info(&ua->policy); |
| 1332 | if (err) { |
| 1333 | printk("BAD policy passed\n"); |
| 1334 | kfree(x); |
| 1335 | return err; |
| 1336 | } |
| 1337 | |
| 1338 | /* build an XP */ |
| 1339 | xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err); if (!xp) { |
| 1340 | kfree(x); |
| 1341 | return err; |
| 1342 | } |
| 1343 | |
| 1344 | memcpy(&x->id, &ua->id, sizeof(ua->id)); |
| 1345 | memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); |
| 1346 | memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); |
| 1347 | |
| 1348 | ut = RTA_DATA(rt); |
| 1349 | /* extract the templates and for each call km_key */ |
| 1350 | for (i = 0; i < xp->xfrm_nr; i++, ut++) { |
| 1351 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; |
| 1352 | memcpy(&x->id, &t->id, sizeof(x->id)); |
| 1353 | x->props.mode = t->mode; |
| 1354 | x->props.reqid = t->reqid; |
| 1355 | x->props.family = ut->family; |
| 1356 | t->aalgos = ua->aalgos; |
| 1357 | t->ealgos = ua->ealgos; |
| 1358 | t->calgos = ua->calgos; |
| 1359 | err = km_query(x, t, xp); |
| 1360 | |
| 1361 | } |
| 1362 | |
| 1363 | kfree(x); |
| 1364 | kfree(xp); |
| 1365 | |
| 1366 | return 0; |
| 1367 | } |
| 1368 | |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1369 | |
Thomas Graf | 492b558 | 2005-05-03 14:26:40 -0700 | [diff] [blame] | 1370 | #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type)) |
| 1371 | |
| 1372 | static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { |
| 1373 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), |
| 1374 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), |
| 1375 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), |
| 1376 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), |
| 1377 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), |
| 1378 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), |
| 1379 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), |
Jamal Hadi Salim | 980ebd2 | 2006-03-20 19:16:40 -0800 | [diff] [blame] | 1380 | [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), |
Jamal Hadi Salim | 53bc6b4 | 2006-03-20 19:17:03 -0800 | [diff] [blame] | 1381 | [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), |
Thomas Graf | 492b558 | 2005-05-03 14:26:40 -0700 | [diff] [blame] | 1382 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), |
| 1383 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), |
Jamal Hadi Salim | 6c5c8ca | 2006-03-20 19:17:25 -0800 | [diff] [blame] | 1384 | [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), |
Thomas Graf | 492b558 | 2005-05-03 14:26:40 -0700 | [diff] [blame] | 1385 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), |
| 1386 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0), |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1387 | [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), |
| 1388 | [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | }; |
| 1390 | |
Thomas Graf | 492b558 | 2005-05-03 14:26:40 -0700 | [diff] [blame] | 1391 | #undef XMSGSIZE |
| 1392 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | static struct xfrm_link { |
| 1394 | int (*doit)(struct sk_buff *, struct nlmsghdr *, void **); |
| 1395 | int (*dump)(struct sk_buff *, struct netlink_callback *); |
Thomas Graf | 492b558 | 2005-05-03 14:26:40 -0700 | [diff] [blame] | 1396 | } xfrm_dispatch[XFRM_NR_MSGTYPES] = { |
| 1397 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, |
| 1398 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, |
| 1399 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, |
| 1400 | .dump = xfrm_dump_sa }, |
| 1401 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, |
| 1402 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, |
| 1403 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, |
| 1404 | .dump = xfrm_dump_policy }, |
| 1405 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, |
Jamal Hadi Salim | 980ebd2 | 2006-03-20 19:16:40 -0800 | [diff] [blame] | 1406 | [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, |
Jamal Hadi Salim | 53bc6b4 | 2006-03-20 19:17:03 -0800 | [diff] [blame] | 1407 | [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, |
Thomas Graf | 492b558 | 2005-05-03 14:26:40 -0700 | [diff] [blame] | 1408 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, |
| 1409 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, |
Jamal Hadi Salim | 6c5c8ca | 2006-03-20 19:17:25 -0800 | [diff] [blame] | 1410 | [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, |
Thomas Graf | 492b558 | 2005-05-03 14:26:40 -0700 | [diff] [blame] | 1411 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, |
| 1412 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1413 | [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, |
| 1414 | [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | }; |
| 1416 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp) |
| 1418 | { |
| 1419 | struct rtattr *xfrma[XFRMA_MAX]; |
| 1420 | struct xfrm_link *link; |
| 1421 | int type, min_len; |
| 1422 | |
| 1423 | if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) |
| 1424 | return 0; |
| 1425 | |
| 1426 | type = nlh->nlmsg_type; |
| 1427 | |
| 1428 | /* A control message: ignore them */ |
| 1429 | if (type < XFRM_MSG_BASE) |
| 1430 | return 0; |
| 1431 | |
| 1432 | /* Unknown message: reply with EINVAL */ |
| 1433 | if (type > XFRM_MSG_MAX) |
| 1434 | goto err_einval; |
| 1435 | |
| 1436 | type -= XFRM_MSG_BASE; |
| 1437 | link = &xfrm_dispatch[type]; |
| 1438 | |
| 1439 | /* All operations require privileges, even GET */ |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 1440 | if (security_netlink_recv(skb, CAP_NET_ADMIN)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | *errp = -EPERM; |
| 1442 | return -1; |
| 1443 | } |
| 1444 | |
Thomas Graf | 492b558 | 2005-05-03 14:26:40 -0700 | [diff] [blame] | 1445 | if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || |
| 1446 | type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && |
| 1447 | (nlh->nlmsg_flags & NLM_F_DUMP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | if (link->dump == NULL) |
| 1449 | goto err_einval; |
| 1450 | |
| 1451 | if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh, |
Thomas Graf | a8f74b2 | 2005-11-10 02:25:52 +0100 | [diff] [blame] | 1452 | link->dump, NULL)) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | return -1; |
| 1454 | } |
Thomas Graf | 88fc2c8 | 2005-11-10 02:25:54 +0100 | [diff] [blame] | 1455 | |
| 1456 | netlink_queue_skip(nlh, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | return -1; |
| 1458 | } |
| 1459 | |
| 1460 | memset(xfrma, 0, sizeof(xfrma)); |
| 1461 | |
| 1462 | if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type])) |
| 1463 | goto err_einval; |
| 1464 | |
| 1465 | if (nlh->nlmsg_len > min_len) { |
| 1466 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); |
| 1467 | struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len); |
| 1468 | |
| 1469 | while (RTA_OK(attr, attrlen)) { |
| 1470 | unsigned short flavor = attr->rta_type; |
| 1471 | if (flavor) { |
| 1472 | if (flavor > XFRMA_MAX) |
| 1473 | goto err_einval; |
| 1474 | xfrma[flavor - 1] = attr; |
| 1475 | } |
| 1476 | attr = RTA_NEXT(attr, attrlen); |
| 1477 | } |
| 1478 | } |
| 1479 | |
| 1480 | if (link->doit == NULL) |
| 1481 | goto err_einval; |
| 1482 | *errp = link->doit(skb, nlh, (void **) &xfrma); |
| 1483 | |
| 1484 | return *errp; |
| 1485 | |
| 1486 | err_einval: |
| 1487 | *errp = -EINVAL; |
| 1488 | return -1; |
| 1489 | } |
| 1490 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | static void xfrm_netlink_rcv(struct sock *sk, int len) |
| 1492 | { |
Thomas Graf | 88fc2c8 | 2005-11-10 02:25:54 +0100 | [diff] [blame] | 1493 | unsigned int qlen = 0; |
Herbert Xu | 2a0a6eb | 2005-05-03 14:55:09 -0700 | [diff] [blame] | 1494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | do { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 1496 | mutex_lock(&xfrm_cfg_mutex); |
Thomas Graf | 88fc2c8 | 2005-11-10 02:25:54 +0100 | [diff] [blame] | 1497 | netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 1498 | mutex_unlock(&xfrm_cfg_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | |
Herbert Xu | 2a0a6eb | 2005-05-03 14:55:09 -0700 | [diff] [blame] | 1500 | } while (qlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | } |
| 1502 | |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1503 | static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | { |
| 1505 | struct xfrm_user_expire *ue; |
| 1506 | struct nlmsghdr *nlh; |
| 1507 | unsigned char *b = skb->tail; |
| 1508 | |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1509 | nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | sizeof(*ue)); |
| 1511 | ue = NLMSG_DATA(nlh); |
| 1512 | nlh->nlmsg_flags = 0; |
| 1513 | |
| 1514 | copy_to_user_state(x, &ue->state); |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1515 | ue->hard = (c->data.hard != 0) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | |
| 1517 | nlh->nlmsg_len = skb->tail - b; |
| 1518 | return skb->len; |
| 1519 | |
| 1520 | nlmsg_failure: |
| 1521 | skb_trim(skb, b - skb->data); |
| 1522 | return -1; |
| 1523 | } |
| 1524 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1525 | static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | { |
| 1527 | struct sk_buff *skb; |
Jamal Hadi Salim | ee57eef | 2005-06-18 22:45:56 -0700 | [diff] [blame] | 1528 | int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1529 | |
Jamal Hadi Salim | ee57eef | 2005-06-18 22:45:56 -0700 | [diff] [blame] | 1530 | skb = alloc_skb(len, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | if (skb == NULL) |
| 1532 | return -ENOMEM; |
| 1533 | |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1534 | if (build_expire(skb, x, c) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | BUG(); |
| 1536 | |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 1537 | NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE; |
| 1538 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | } |
| 1540 | |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1541 | static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c) |
| 1542 | { |
| 1543 | struct sk_buff *skb; |
| 1544 | int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id)); |
| 1545 | |
| 1546 | len += RTA_SPACE(sizeof(struct xfrm_replay_state)); |
| 1547 | len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur)); |
| 1548 | skb = alloc_skb(len, GFP_ATOMIC); |
| 1549 | if (skb == NULL) |
| 1550 | return -ENOMEM; |
| 1551 | |
| 1552 | if (build_aevent(skb, x, c) < 0) |
| 1553 | BUG(); |
| 1554 | |
| 1555 | NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS; |
| 1556 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); |
| 1557 | } |
| 1558 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1559 | static int xfrm_notify_sa_flush(struct km_event *c) |
| 1560 | { |
| 1561 | struct xfrm_usersa_flush *p; |
| 1562 | struct nlmsghdr *nlh; |
| 1563 | struct sk_buff *skb; |
| 1564 | unsigned char *b; |
| 1565 | int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush)); |
| 1566 | |
| 1567 | skb = alloc_skb(len, GFP_ATOMIC); |
| 1568 | if (skb == NULL) |
| 1569 | return -ENOMEM; |
| 1570 | b = skb->tail; |
| 1571 | |
| 1572 | nlh = NLMSG_PUT(skb, c->pid, c->seq, |
| 1573 | XFRM_MSG_FLUSHSA, sizeof(*p)); |
| 1574 | nlh->nlmsg_flags = 0; |
| 1575 | |
| 1576 | p = NLMSG_DATA(nlh); |
Herbert Xu | bf08867 | 2005-06-18 22:44:00 -0700 | [diff] [blame] | 1577 | p->proto = c->data.proto; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1578 | |
| 1579 | nlh->nlmsg_len = skb->tail - b; |
| 1580 | |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 1581 | NETLINK_CB(skb).dst_group = XFRMNLGRP_SA; |
| 1582 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1583 | |
| 1584 | nlmsg_failure: |
| 1585 | kfree_skb(skb); |
| 1586 | return -1; |
| 1587 | } |
| 1588 | |
| 1589 | static int inline xfrm_sa_len(struct xfrm_state *x) |
| 1590 | { |
Herbert Xu | 0603eac | 2005-06-18 22:54:36 -0700 | [diff] [blame] | 1591 | int l = 0; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1592 | if (x->aalg) |
| 1593 | l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8); |
| 1594 | if (x->ealg) |
| 1595 | l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8); |
| 1596 | if (x->calg) |
| 1597 | l += RTA_SPACE(sizeof(*x->calg)); |
| 1598 | if (x->encap) |
| 1599 | l += RTA_SPACE(sizeof(*x->encap)); |
| 1600 | |
| 1601 | return l; |
| 1602 | } |
| 1603 | |
| 1604 | static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c) |
| 1605 | { |
| 1606 | struct xfrm_usersa_info *p; |
Herbert Xu | 0603eac | 2005-06-18 22:54:36 -0700 | [diff] [blame] | 1607 | struct xfrm_usersa_id *id; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1608 | struct nlmsghdr *nlh; |
| 1609 | struct sk_buff *skb; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1610 | unsigned char *b; |
| 1611 | int len = xfrm_sa_len(x); |
Herbert Xu | 0603eac | 2005-06-18 22:54:36 -0700 | [diff] [blame] | 1612 | int headlen; |
| 1613 | |
| 1614 | headlen = sizeof(*p); |
| 1615 | if (c->event == XFRM_MSG_DELSA) { |
| 1616 | len += RTA_SPACE(headlen); |
| 1617 | headlen = sizeof(*id); |
| 1618 | } |
| 1619 | len += NLMSG_SPACE(headlen); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1620 | |
| 1621 | skb = alloc_skb(len, GFP_ATOMIC); |
| 1622 | if (skb == NULL) |
| 1623 | return -ENOMEM; |
| 1624 | b = skb->tail; |
| 1625 | |
Herbert Xu | 0603eac | 2005-06-18 22:54:36 -0700 | [diff] [blame] | 1626 | nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1627 | nlh->nlmsg_flags = 0; |
| 1628 | |
| 1629 | p = NLMSG_DATA(nlh); |
Herbert Xu | 0603eac | 2005-06-18 22:54:36 -0700 | [diff] [blame] | 1630 | if (c->event == XFRM_MSG_DELSA) { |
| 1631 | id = NLMSG_DATA(nlh); |
| 1632 | memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); |
| 1633 | id->spi = x->id.spi; |
| 1634 | id->family = x->props.family; |
| 1635 | id->proto = x->id.proto; |
| 1636 | |
| 1637 | p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p))); |
| 1638 | } |
| 1639 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1640 | copy_to_user_state(x, p); |
| 1641 | |
| 1642 | if (x->aalg) |
| 1643 | RTA_PUT(skb, XFRMA_ALG_AUTH, |
| 1644 | sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg); |
| 1645 | if (x->ealg) |
| 1646 | RTA_PUT(skb, XFRMA_ALG_CRYPT, |
| 1647 | sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg); |
| 1648 | if (x->calg) |
| 1649 | RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); |
| 1650 | |
| 1651 | if (x->encap) |
| 1652 | RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); |
| 1653 | |
| 1654 | nlh->nlmsg_len = skb->tail - b; |
| 1655 | |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 1656 | NETLINK_CB(skb).dst_group = XFRMNLGRP_SA; |
| 1657 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1658 | |
| 1659 | nlmsg_failure: |
| 1660 | rtattr_failure: |
| 1661 | kfree_skb(skb); |
| 1662 | return -1; |
| 1663 | } |
| 1664 | |
| 1665 | static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c) |
| 1666 | { |
| 1667 | |
| 1668 | switch (c->event) { |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 1669 | case XFRM_MSG_EXPIRE: |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1670 | return xfrm_exp_state_notify(x, c); |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1671 | case XFRM_MSG_NEWAE: |
| 1672 | return xfrm_aevent_state_notify(x, c); |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 1673 | case XFRM_MSG_DELSA: |
| 1674 | case XFRM_MSG_UPDSA: |
| 1675 | case XFRM_MSG_NEWSA: |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1676 | return xfrm_notify_sa(x, c); |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 1677 | case XFRM_MSG_FLUSHSA: |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1678 | return xfrm_notify_sa_flush(c); |
| 1679 | default: |
| 1680 | printk("xfrm_user: Unknown SA event %d\n", c->event); |
| 1681 | break; |
| 1682 | } |
| 1683 | |
| 1684 | return 0; |
| 1685 | |
| 1686 | } |
| 1687 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, |
| 1689 | struct xfrm_tmpl *xt, struct xfrm_policy *xp, |
| 1690 | int dir) |
| 1691 | { |
| 1692 | struct xfrm_user_acquire *ua; |
| 1693 | struct nlmsghdr *nlh; |
| 1694 | unsigned char *b = skb->tail; |
| 1695 | __u32 seq = xfrm_get_acqseq(); |
| 1696 | |
| 1697 | nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE, |
| 1698 | sizeof(*ua)); |
| 1699 | ua = NLMSG_DATA(nlh); |
| 1700 | nlh->nlmsg_flags = 0; |
| 1701 | |
| 1702 | memcpy(&ua->id, &x->id, sizeof(ua->id)); |
| 1703 | memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); |
| 1704 | memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); |
| 1705 | copy_to_user_policy(xp, &ua->policy, dir); |
| 1706 | ua->aalgos = xt->aalgos; |
| 1707 | ua->ealgos = xt->ealgos; |
| 1708 | ua->calgos = xt->calgos; |
| 1709 | ua->seq = x->km.seq = seq; |
| 1710 | |
| 1711 | if (copy_to_user_tmpl(xp, skb) < 0) |
| 1712 | goto nlmsg_failure; |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1713 | if (copy_to_user_sec_ctx(xp, skb)) |
| 1714 | goto nlmsg_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | |
| 1716 | nlh->nlmsg_len = skb->tail - b; |
| 1717 | return skb->len; |
| 1718 | |
| 1719 | nlmsg_failure: |
| 1720 | skb_trim(skb, b - skb->data); |
| 1721 | return -1; |
| 1722 | } |
| 1723 | |
| 1724 | static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, |
| 1725 | struct xfrm_policy *xp, int dir) |
| 1726 | { |
| 1727 | struct sk_buff *skb; |
| 1728 | size_t len; |
| 1729 | |
| 1730 | len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); |
| 1731 | len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire)); |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1732 | len += RTA_SPACE(xfrm_user_sec_ctx_size(xp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | skb = alloc_skb(len, GFP_ATOMIC); |
| 1734 | if (skb == NULL) |
| 1735 | return -ENOMEM; |
| 1736 | |
| 1737 | if (build_acquire(skb, x, xt, xp, dir) < 0) |
| 1738 | BUG(); |
| 1739 | |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 1740 | NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE; |
| 1741 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | } |
| 1743 | |
| 1744 | /* User gives us xfrm_user_policy_info followed by an array of 0 |
| 1745 | * or more templates. |
| 1746 | */ |
| 1747 | static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt, |
| 1748 | u8 *data, int len, int *dir) |
| 1749 | { |
| 1750 | struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; |
| 1751 | struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); |
| 1752 | struct xfrm_policy *xp; |
| 1753 | int nr; |
| 1754 | |
| 1755 | switch (family) { |
| 1756 | case AF_INET: |
| 1757 | if (opt != IP_XFRM_POLICY) { |
| 1758 | *dir = -EOPNOTSUPP; |
| 1759 | return NULL; |
| 1760 | } |
| 1761 | break; |
| 1762 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 1763 | case AF_INET6: |
| 1764 | if (opt != IPV6_XFRM_POLICY) { |
| 1765 | *dir = -EOPNOTSUPP; |
| 1766 | return NULL; |
| 1767 | } |
| 1768 | break; |
| 1769 | #endif |
| 1770 | default: |
| 1771 | *dir = -EINVAL; |
| 1772 | return NULL; |
| 1773 | } |
| 1774 | |
| 1775 | *dir = -EINVAL; |
| 1776 | |
| 1777 | if (len < sizeof(*p) || |
| 1778 | verify_newpolicy_info(p)) |
| 1779 | return NULL; |
| 1780 | |
| 1781 | nr = ((len - sizeof(*p)) / sizeof(*ut)); |
| 1782 | if (nr > XFRM_MAX_DEPTH) |
| 1783 | return NULL; |
| 1784 | |
Herbert Xu | a4f1bac | 2005-07-26 15:43:17 -0700 | [diff] [blame] | 1785 | if (p->dir > XFRM_POLICY_OUT) |
| 1786 | return NULL; |
| 1787 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1788 | xp = xfrm_policy_alloc(GFP_KERNEL); |
| 1789 | if (xp == NULL) { |
| 1790 | *dir = -ENOBUFS; |
| 1791 | return NULL; |
| 1792 | } |
| 1793 | |
| 1794 | copy_from_user_policy(xp, p); |
| 1795 | copy_templates(xp, ut, nr); |
| 1796 | |
| 1797 | *dir = p->dir; |
| 1798 | |
| 1799 | return xp; |
| 1800 | } |
| 1801 | |
| 1802 | static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1803 | int dir, struct km_event *c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | { |
| 1805 | struct xfrm_user_polexpire *upe; |
| 1806 | struct nlmsghdr *nlh; |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1807 | int hard = c->data.hard; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | unsigned char *b = skb->tail; |
| 1809 | |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1810 | nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | upe = NLMSG_DATA(nlh); |
| 1812 | nlh->nlmsg_flags = 0; |
| 1813 | |
| 1814 | copy_to_user_policy(xp, &upe->pol, dir); |
| 1815 | if (copy_to_user_tmpl(xp, skb) < 0) |
| 1816 | goto nlmsg_failure; |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1817 | if (copy_to_user_sec_ctx(xp, skb)) |
| 1818 | goto nlmsg_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | upe->hard = !!hard; |
| 1820 | |
| 1821 | nlh->nlmsg_len = skb->tail - b; |
| 1822 | return skb->len; |
| 1823 | |
| 1824 | nlmsg_failure: |
| 1825 | skb_trim(skb, b - skb->data); |
| 1826 | return -1; |
| 1827 | } |
| 1828 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1829 | static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1830 | { |
| 1831 | struct sk_buff *skb; |
| 1832 | size_t len; |
| 1833 | |
| 1834 | len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); |
| 1835 | len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire)); |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1836 | len += RTA_SPACE(xfrm_user_sec_ctx_size(xp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | skb = alloc_skb(len, GFP_ATOMIC); |
| 1838 | if (skb == NULL) |
| 1839 | return -ENOMEM; |
| 1840 | |
Jamal Hadi Salim | d51d081 | 2006-03-20 19:16:12 -0800 | [diff] [blame] | 1841 | if (build_polexpire(skb, xp, dir, c) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | BUG(); |
| 1843 | |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 1844 | NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE; |
| 1845 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1846 | } |
| 1847 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1848 | static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) |
| 1849 | { |
| 1850 | struct xfrm_userpolicy_info *p; |
Herbert Xu | 0603eac | 2005-06-18 22:54:36 -0700 | [diff] [blame] | 1851 | struct xfrm_userpolicy_id *id; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1852 | struct nlmsghdr *nlh; |
| 1853 | struct sk_buff *skb; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1854 | unsigned char *b; |
| 1855 | int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); |
Herbert Xu | 0603eac | 2005-06-18 22:54:36 -0700 | [diff] [blame] | 1856 | int headlen; |
| 1857 | |
| 1858 | headlen = sizeof(*p); |
| 1859 | if (c->event == XFRM_MSG_DELPOLICY) { |
| 1860 | len += RTA_SPACE(headlen); |
| 1861 | headlen = sizeof(*id); |
| 1862 | } |
| 1863 | len += NLMSG_SPACE(headlen); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1864 | |
| 1865 | skb = alloc_skb(len, GFP_ATOMIC); |
| 1866 | if (skb == NULL) |
| 1867 | return -ENOMEM; |
| 1868 | b = skb->tail; |
| 1869 | |
Herbert Xu | 0603eac | 2005-06-18 22:54:36 -0700 | [diff] [blame] | 1870 | nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1871 | |
| 1872 | p = NLMSG_DATA(nlh); |
Herbert Xu | 0603eac | 2005-06-18 22:54:36 -0700 | [diff] [blame] | 1873 | if (c->event == XFRM_MSG_DELPOLICY) { |
| 1874 | id = NLMSG_DATA(nlh); |
| 1875 | memset(id, 0, sizeof(*id)); |
| 1876 | id->dir = dir; |
| 1877 | if (c->data.byid) |
| 1878 | id->index = xp->index; |
| 1879 | else |
| 1880 | memcpy(&id->sel, &xp->selector, sizeof(id->sel)); |
| 1881 | |
| 1882 | p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p))); |
| 1883 | } |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1884 | |
| 1885 | nlh->nlmsg_flags = 0; |
| 1886 | |
| 1887 | copy_to_user_policy(xp, p, dir); |
| 1888 | if (copy_to_user_tmpl(xp, skb) < 0) |
| 1889 | goto nlmsg_failure; |
| 1890 | |
| 1891 | nlh->nlmsg_len = skb->tail - b; |
| 1892 | |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 1893 | NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY; |
| 1894 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1895 | |
| 1896 | nlmsg_failure: |
Herbert Xu | 0603eac | 2005-06-18 22:54:36 -0700 | [diff] [blame] | 1897 | rtattr_failure: |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1898 | kfree_skb(skb); |
| 1899 | return -1; |
| 1900 | } |
| 1901 | |
| 1902 | static int xfrm_notify_policy_flush(struct km_event *c) |
| 1903 | { |
| 1904 | struct nlmsghdr *nlh; |
| 1905 | struct sk_buff *skb; |
| 1906 | unsigned char *b; |
| 1907 | int len = NLMSG_LENGTH(0); |
| 1908 | |
| 1909 | skb = alloc_skb(len, GFP_ATOMIC); |
| 1910 | if (skb == NULL) |
| 1911 | return -ENOMEM; |
| 1912 | b = skb->tail; |
| 1913 | |
| 1914 | |
| 1915 | nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0); |
| 1916 | |
| 1917 | nlh->nlmsg_len = skb->tail - b; |
| 1918 | |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 1919 | NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY; |
| 1920 | return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1921 | |
| 1922 | nlmsg_failure: |
| 1923 | kfree_skb(skb); |
| 1924 | return -1; |
| 1925 | } |
| 1926 | |
| 1927 | static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
| 1928 | { |
| 1929 | |
| 1930 | switch (c->event) { |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 1931 | case XFRM_MSG_NEWPOLICY: |
| 1932 | case XFRM_MSG_UPDPOLICY: |
| 1933 | case XFRM_MSG_DELPOLICY: |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1934 | return xfrm_notify_policy(xp, dir, c); |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 1935 | case XFRM_MSG_FLUSHPOLICY: |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1936 | return xfrm_notify_policy_flush(c); |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 1937 | case XFRM_MSG_POLEXPIRE: |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 1938 | return xfrm_exp_policy_notify(xp, dir, c); |
| 1939 | default: |
| 1940 | printk("xfrm_user: Unknown Policy event %d\n", c->event); |
| 1941 | } |
| 1942 | |
| 1943 | return 0; |
| 1944 | |
| 1945 | } |
| 1946 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | static struct xfrm_mgr netlink_mgr = { |
| 1948 | .id = "netlink", |
| 1949 | .notify = xfrm_send_state_notify, |
| 1950 | .acquire = xfrm_send_acquire, |
| 1951 | .compile_policy = xfrm_compile_policy, |
| 1952 | .notify_policy = xfrm_send_policy_notify, |
| 1953 | }; |
| 1954 | |
| 1955 | static int __init xfrm_user_init(void) |
| 1956 | { |
Patrick McHardy | be33690 | 2006-03-20 22:40:54 -0800 | [diff] [blame] | 1957 | struct sock *nlsk; |
| 1958 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1959 | printk(KERN_INFO "Initializing IPsec netlink socket\n"); |
| 1960 | |
Patrick McHardy | be33690 | 2006-03-20 22:40:54 -0800 | [diff] [blame] | 1961 | nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX, |
| 1962 | xfrm_netlink_rcv, THIS_MODULE); |
| 1963 | if (nlsk == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | return -ENOMEM; |
Patrick McHardy | be33690 | 2006-03-20 22:40:54 -0800 | [diff] [blame] | 1965 | rcu_assign_pointer(xfrm_nl, nlsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | |
| 1967 | xfrm_register_km(&netlink_mgr); |
| 1968 | |
| 1969 | return 0; |
| 1970 | } |
| 1971 | |
| 1972 | static void __exit xfrm_user_exit(void) |
| 1973 | { |
Patrick McHardy | be33690 | 2006-03-20 22:40:54 -0800 | [diff] [blame] | 1974 | struct sock *nlsk = xfrm_nl; |
| 1975 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | xfrm_unregister_km(&netlink_mgr); |
Patrick McHardy | be33690 | 2006-03-20 22:40:54 -0800 | [diff] [blame] | 1977 | rcu_assign_pointer(xfrm_nl, NULL); |
| 1978 | synchronize_rcu(); |
| 1979 | sock_release(nlsk->sk_socket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1980 | } |
| 1981 | |
| 1982 | module_init(xfrm_user_init); |
| 1983 | module_exit(xfrm_user_exit); |
| 1984 | MODULE_LICENSE("GPL"); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1985 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); |
Jamal Hadi Salim | f8cd548 | 2006-03-20 19:15:11 -0800 | [diff] [blame] | 1986 | |