net/xfrm/xfrm_user.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /* xfrm_user.c: User interface to configure xfrm engine.
0003  *
0004  * Copyright (C) 2002 David S. Miller (davem@redhat.com)
0005  *
0006  * Changes:
0007  *  Mitsuru KANDA @USAGI
0008  *  Kazunori MIYAZAWA @USAGI
0009  *  Kunihiro Ishiguro <kunihiro@ipinfusion.com>
0010  *      IPv6 support
0011  *
0012  */
0013
0014 #include <linux/compat.h>
0015 #include <linux/crypto.h>
0016 #include <linux/module.h>
0017 #include <linux/kernel.h>
0018 #include <linux/types.h>
0019 #include <linux/slab.h>
0020 #include <linux/socket.h>
0021 #include <linux/string.h>
0022 #include <linux/net.h>
0023 #include <linux/skbuff.h>
0024 #include <linux/pfkeyv2.h>
0025 #include <linux/ipsec.h>
0026 #include <linux/init.h>
0027 #include <linux/security.h>
0028 #include <net/sock.h>
0029 #include <net/xfrm.h>
0030 #include <net/netlink.h>
0031 #include <net/ah.h>
0032 #include <linux/uaccess.h>
0033 #if IS_ENABLED(CONFIG_IPV6)
0034 #include <linux/in6.h>
0035 #endif
0036 #include <asm/unaligned.h>
0037
0038 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
0039 {
0040     struct nlattr *rt = attrs[type];
0041     struct xfrm_algo *algp;
0042
0043     if (!rt)
0044         return 0;
0045
0046     algp = nla_data(rt);
0047     if (nla_len(rt) < (int)xfrm_alg_len(algp))
0048         return -EINVAL;
0049
0050     switch (type) {
0051     case XFRMA_ALG_AUTH:
0052     case XFRMA_ALG_CRYPT:
0053     case XFRMA_ALG_COMP:
0054         break;
0055
0056     default:
0057         return -EINVAL;
0058     }
0059
0060     algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
0061     return 0;
0062 }
0063
0064 static int verify_auth_trunc(struct nlattr **attrs)
0065 {
0066     struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
0067     struct xfrm_algo_auth *algp;
0068
0069     if (!rt)
0070         return 0;
0071
0072     algp = nla_data(rt);
0073     if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
0074         return -EINVAL;
0075
0076     algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
0077     return 0;
0078 }
0079
0080 static int verify_aead(struct nlattr **attrs)
0081 {
0082     struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
0083     struct xfrm_algo_aead *algp;
0084
0085     if (!rt)
0086         return 0;
0087
0088     algp = nla_data(rt);
0089     if (nla_len(rt) < (int)aead_len(algp))
0090         return -EINVAL;
0091
0092     algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
0093     return 0;
0094 }
0095
0096 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
0097                xfrm_address_t **addrp)
0098 {
0099     struct nlattr *rt = attrs[type];
0100
0101     if (rt && addrp)
0102         *addrp = nla_data(rt);
0103 }
0104
0105 static inline int verify_sec_ctx_len(struct nlattr **attrs)
0106 {
0107     struct nlattr *rt = attrs[XFRMA_SEC_CTX];
0108     struct xfrm_user_sec_ctx *uctx;
0109
0110     if (!rt)
0111         return 0;
0112
0113     uctx = nla_data(rt);
0114     if (uctx->len > nla_len(rt) ||
0115         uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
0116         return -EINVAL;
0117
0118     return 0;
0119 }
0120
0121 static inline int verify_replay(struct xfrm_usersa_info *p,
0122                 struct nlattr **attrs)
0123 {
0124     struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
0125     struct xfrm_replay_state_esn *rs;
0126
0127     if (!rt)
0128         return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
0129
0130     rs = nla_data(rt);
0131
0132     if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
0133         return -EINVAL;
0134
0135     if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
0136         nla_len(rt) != sizeof(*rs))
0137         return -EINVAL;
0138
0139     /* As only ESP and AH support ESN feature. */
0140     if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
0141         return -EINVAL;
0142
0143     if (p->replay_window != 0)
0144         return -EINVAL;
0145
0146     return 0;
0147 }
0148
0149 static int verify_newsa_info(struct xfrm_usersa_info *p,
0150                  struct nlattr **attrs)
0151 {
0152     int err;
0153
0154     err = -EINVAL;
0155     switch (p->family) {
0156     case AF_INET:
0157         break;
0158
0159     case AF_INET6:
0160 #if IS_ENABLED(CONFIG_IPV6)
0161         break;
0162 #else
0163         err = -EAFNOSUPPORT;
0164         goto out;
0165 #endif
0166
0167     default:
0168         goto out;
0169     }
0170
0171     switch (p->sel.family) {
0172     case AF_UNSPEC:
0173         break;
0174
0175     case AF_INET:
0176         if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
0177             goto out;
0178
0179         break;
0180
0181     case AF_INET6:
0182 #if IS_ENABLED(CONFIG_IPV6)
0183         if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
0184             goto out;
0185
0186         break;
0187 #else
0188         err = -EAFNOSUPPORT;
0189         goto out;
0190 #endif
0191
0192     default:
0193         goto out;
0194     }
0195
0196     err = -EINVAL;
0197     switch (p->id.proto) {
0198     case IPPROTO_AH:
0199         if ((!attrs[XFRMA_ALG_AUTH] &&
0200              !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
0201             attrs[XFRMA_ALG_AEAD]   ||
0202             attrs[XFRMA_ALG_CRYPT]  ||
0203             attrs[XFRMA_ALG_COMP]   ||
0204             attrs[XFRMA_TFCPAD])
0205             goto out;
0206         break;
0207
0208     case IPPROTO_ESP:
0209         if (attrs[XFRMA_ALG_COMP])
0210             goto out;
0211         if (!attrs[XFRMA_ALG_AUTH] &&
0212             !attrs[XFRMA_ALG_AUTH_TRUNC] &&
0213             !attrs[XFRMA_ALG_CRYPT] &&
0214             !attrs[XFRMA_ALG_AEAD])
0215             goto out;
0216         if ((attrs[XFRMA_ALG_AUTH] ||
0217              attrs[XFRMA_ALG_AUTH_TRUNC] ||
0218              attrs[XFRMA_ALG_CRYPT]) &&
0219             attrs[XFRMA_ALG_AEAD])
0220             goto out;
0221         if (attrs[XFRMA_TFCPAD] &&
0222             p->mode != XFRM_MODE_TUNNEL)
0223             goto out;
0224         break;
0225
0226     case IPPROTO_COMP:
0227         if (!attrs[XFRMA_ALG_COMP]  ||
0228             attrs[XFRMA_ALG_AEAD]   ||
0229             attrs[XFRMA_ALG_AUTH]   ||
0230             attrs[XFRMA_ALG_AUTH_TRUNC] ||
0231             attrs[XFRMA_ALG_CRYPT]  ||
0232             attrs[XFRMA_TFCPAD]     ||
0233             (ntohl(p->id.spi) >= 0x10000))
0234             goto out;
0235         break;
0236
0237 #if IS_ENABLED(CONFIG_IPV6)
0238     case IPPROTO_DSTOPTS:
0239     case IPPROTO_ROUTING:
0240         if (attrs[XFRMA_ALG_COMP]   ||
0241             attrs[XFRMA_ALG_AUTH]   ||
0242             attrs[XFRMA_ALG_AUTH_TRUNC] ||
0243             attrs[XFRMA_ALG_AEAD]   ||
0244             attrs[XFRMA_ALG_CRYPT]  ||
0245             attrs[XFRMA_ENCAP]      ||
0246             attrs[XFRMA_SEC_CTX]    ||
0247             attrs[XFRMA_TFCPAD]     ||
0248             !attrs[XFRMA_COADDR])
0249             goto out;
0250         break;
0251 #endif
0252
0253     default:
0254         goto out;
0255     }
0256
0257     if ((err = verify_aead(attrs)))
0258         goto out;
0259     if ((err = verify_auth_trunc(attrs)))
0260         goto out;
0261     if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
0262         goto out;
0263     if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
0264         goto out;
0265     if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
0266         goto out;
0267     if ((err = verify_sec_ctx_len(attrs)))
0268         goto out;
0269     if ((err = verify_replay(p, attrs)))
0270         goto out;
0271
0272     err = -EINVAL;
0273     switch (p->mode) {
0274     case XFRM_MODE_TRANSPORT:
0275     case XFRM_MODE_TUNNEL:
0276     case XFRM_MODE_ROUTEOPTIMIZATION:
0277     case XFRM_MODE_BEET:
0278         break;
0279
0280     default:
0281         goto out;
0282     }
0283
0284     err = 0;
0285
0286     if (attrs[XFRMA_MTIMER_THRESH])
0287         if (!attrs[XFRMA_ENCAP])
0288             err = -EINVAL;
0289
0290 out:
0291     return err;
0292 }
0293
0294 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
0295                struct xfrm_algo_desc *(*get_byname)(const char *, int),
0296                struct nlattr *rta)
0297 {
0298     struct xfrm_algo *p, *ualg;
0299     struct xfrm_algo_desc *algo;
0300
0301     if (!rta)
0302         return 0;
0303
0304     ualg = nla_data(rta);
0305
0306     algo = get_byname(ualg->alg_name, 1);
0307     if (!algo)
0308         return -ENOSYS;
0309     *props = algo->desc.sadb_alg_id;
0310
0311     p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
0312     if (!p)
0313         return -ENOMEM;
0314
0315     strcpy(p->alg_name, algo->name);
0316     *algpp = p;
0317     return 0;
0318 }
0319
0320 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
0321 {
0322     struct xfrm_algo *p, *ualg;
0323     struct xfrm_algo_desc *algo;
0324
0325     if (!rta)
0326         return 0;
0327
0328     ualg = nla_data(rta);
0329
0330     algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
0331     if (!algo)
0332         return -ENOSYS;
0333     x->props.ealgo = algo->desc.sadb_alg_id;
0334
0335     p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
0336     if (!p)
0337         return -ENOMEM;
0338
0339     strcpy(p->alg_name, algo->name);
0340     x->ealg = p;
0341     x->geniv = algo->uinfo.encr.geniv;
0342     return 0;
0343 }
0344
0345 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
0346                struct nlattr *rta)
0347 {
0348     struct xfrm_algo *ualg;
0349     struct xfrm_algo_auth *p;
0350     struct xfrm_algo_desc *algo;
0351
0352     if (!rta)
0353         return 0;
0354
0355     ualg = nla_data(rta);
0356
0357     algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
0358     if (!algo)
0359         return -ENOSYS;
0360     *props = algo->desc.sadb_alg_id;
0361
0362     p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
0363     if (!p)
0364         return -ENOMEM;
0365
0366     strcpy(p->alg_name, algo->name);
0367     p->alg_key_len = ualg->alg_key_len;
0368     p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
0369     memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
0370
0371     *algpp = p;
0372     return 0;
0373 }
0374
0375 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
0376                  struct nlattr *rta)
0377 {
0378     struct xfrm_algo_auth *p, *ualg;
0379     struct xfrm_algo_desc *algo;
0380
0381     if (!rta)
0382         return 0;
0383
0384     ualg = nla_data(rta);
0385
0386     algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
0387     if (!algo)
0388         return -ENOSYS;
0389     if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
0390         return -EINVAL;
0391     *props = algo->desc.sadb_alg_id;
0392
0393     p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
0394     if (!p)
0395         return -ENOMEM;
0396
0397     strcpy(p->alg_name, algo->name);
0398     if (!p->alg_trunc_len)
0399         p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
0400
0401     *algpp = p;
0402     return 0;
0403 }
0404
0405 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
0406 {
0407     struct xfrm_algo_aead *p, *ualg;
0408     struct xfrm_algo_desc *algo;
0409
0410     if (!rta)
0411         return 0;
0412
0413     ualg = nla_data(rta);
0414
0415     algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
0416     if (!algo)
0417         return -ENOSYS;
0418     x->props.ealgo = algo->desc.sadb_alg_id;
0419
0420     p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
0421     if (!p)
0422         return -ENOMEM;
0423
0424     strcpy(p->alg_name, algo->name);
0425     x->aead = p;
0426     x->geniv = algo->uinfo.aead.geniv;
0427     return 0;
0428 }
0429
0430 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
0431                      struct nlattr *rp)
0432 {
0433     struct xfrm_replay_state_esn *up;
0434     unsigned int ulen;
0435
0436     if (!replay_esn || !rp)
0437         return 0;
0438
0439     up = nla_data(rp);
0440     ulen = xfrm_replay_state_esn_len(up);
0441
0442     /* Check the overall length and the internal bitmap length to avoid
0443      * potential overflow. */
0444     if (nla_len(rp) < (int)ulen ||
0445         xfrm_replay_state_esn_len(replay_esn) != ulen ||
0446         replay_esn->bmp_len != up->bmp_len)
0447         return -EINVAL;
0448
0449     if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
0450         return -EINVAL;
0451
0452     return 0;
0453 }
0454
0455 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
0456                        struct xfrm_replay_state_esn **preplay_esn,
0457                        struct nlattr *rta)
0458 {
0459     struct xfrm_replay_state_esn *p, *pp, *up;
0460     unsigned int klen, ulen;
0461
0462     if (!rta)
0463         return 0;
0464
0465     up = nla_data(rta);
0466     klen = xfrm_replay_state_esn_len(up);
0467     ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
0468
0469     p = kzalloc(klen, GFP_KERNEL);
0470     if (!p)
0471         return -ENOMEM;
0472
0473     pp = kzalloc(klen, GFP_KERNEL);
0474     if (!pp) {
0475         kfree(p);
0476         return -ENOMEM;
0477     }
0478
0479     memcpy(p, up, ulen);
0480     memcpy(pp, up, ulen);
0481
0482     *replay_esn = p;
0483     *preplay_esn = pp;
0484
0485     return 0;
0486 }
0487
0488 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
0489 {
0490     unsigned int len = 0;
0491
0492     if (xfrm_ctx) {
0493         len += sizeof(struct xfrm_user_sec_ctx);
0494         len += xfrm_ctx->ctx_len;
0495     }
0496     return len;
0497 }
0498
0499 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
0500 {
0501     memcpy(&x->id, &p->id, sizeof(x->id));
0502     memcpy(&x->sel, &p->sel, sizeof(x->sel));
0503     memcpy(&x->lft, &p->lft, sizeof(x->lft));
0504     x->props.mode = p->mode;
0505     x->props.replay_window = min_t(unsigned int, p->replay_window,
0506                     sizeof(x->replay.bitmap) * 8);
0507     x->props.reqid = p->reqid;
0508     x->props.family = p->family;
0509     memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
0510     x->props.flags = p->flags;
0511
0512     if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
0513         x->sel.family = p->family;
0514 }
0515
0516 /*
0517  * someday when pfkey also has support, we could have the code
0518  * somehow made shareable and move it to xfrm_state.c - JHS
0519  *
0520 */
0521 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
0522                   int update_esn)
0523 {
0524     struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
0525     struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
0526     struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
0527     struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
0528     struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
0529     struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH];
0530
0531     if (re) {
0532         struct xfrm_replay_state_esn *replay_esn;
0533         replay_esn = nla_data(re);
0534         memcpy(x->replay_esn, replay_esn,
0535                xfrm_replay_state_esn_len(replay_esn));
0536         memcpy(x->preplay_esn, replay_esn,
0537                xfrm_replay_state_esn_len(replay_esn));
0538     }
0539
0540     if (rp) {
0541         struct xfrm_replay_state *replay;
0542         replay = nla_data(rp);
0543         memcpy(&x->replay, replay, sizeof(*replay));
0544         memcpy(&x->preplay, replay, sizeof(*replay));
0545     }
0546
0547     if (lt) {
0548         struct xfrm_lifetime_cur *ltime;
0549         ltime = nla_data(lt);
0550         x->curlft.bytes = ltime->bytes;
0551         x->curlft.packets = ltime->packets;
0552         x->curlft.add_time = ltime->add_time;
0553         x->curlft.use_time = ltime->use_time;
0554     }
0555
0556     if (et)
0557         x->replay_maxage = nla_get_u32(et);
0558
0559     if (rt)
0560         x->replay_maxdiff = nla_get_u32(rt);
0561
0562     if (mt)
0563         x->mapping_maxage = nla_get_u32(mt);
0564 }
0565
0566 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
0567 {
0568     if (attrs[XFRMA_SET_MARK]) {
0569         m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
0570         if (attrs[XFRMA_SET_MARK_MASK])
0571             m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
0572         else
0573             m->m = 0xffffffff;
0574     } else {
0575         m->v = m->m = 0;
0576     }
0577 }
0578
0579 static struct xfrm_state *xfrm_state_construct(struct net *net,
0580                            struct xfrm_usersa_info *p,
0581                            struct nlattr **attrs,
0582                            int *errp)
0583 {
0584     struct xfrm_state *x = xfrm_state_alloc(net);
0585     int err = -ENOMEM;
0586
0587     if (!x)
0588         goto error_no_put;
0589
0590     copy_from_user_state(x, p);
0591
0592     if (attrs[XFRMA_ENCAP]) {
0593         x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
0594                    sizeof(*x->encap), GFP_KERNEL);
0595         if (x->encap == NULL)
0596             goto error;
0597     }
0598
0599     if (attrs[XFRMA_COADDR]) {
0600         x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
0601                     sizeof(*x->coaddr), GFP_KERNEL);
0602         if (x->coaddr == NULL)
0603             goto error;
0604     }
0605
0606     if (attrs[XFRMA_SA_EXTRA_FLAGS])
0607         x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
0608
0609     if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
0610         goto error;
0611     if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
0612                      attrs[XFRMA_ALG_AUTH_TRUNC])))
0613         goto error;
0614     if (!x->props.aalgo) {
0615         if ((err = attach_auth(&x->aalg, &x->props.aalgo,
0616                        attrs[XFRMA_ALG_AUTH])))
0617             goto error;
0618     }
0619     if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
0620         goto error;
0621     if ((err = attach_one_algo(&x->calg, &x->props.calgo,
0622                    xfrm_calg_get_byname,
0623                    attrs[XFRMA_ALG_COMP])))
0624         goto error;
0625
0626     if (attrs[XFRMA_TFCPAD])
0627         x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
0628
0629     xfrm_mark_get(attrs, &x->mark);
0630
0631     xfrm_smark_init(attrs, &x->props.smark);
0632
0633     if (attrs[XFRMA_IF_ID])
0634         x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
0635
0636     err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
0637     if (err)
0638         goto error;
0639
0640     if (attrs[XFRMA_SEC_CTX]) {
0641         err = security_xfrm_state_alloc(x,
0642                         nla_data(attrs[XFRMA_SEC_CTX]));
0643         if (err)
0644             goto error;
0645     }
0646
0647     if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
0648                            attrs[XFRMA_REPLAY_ESN_VAL])))
0649         goto error;
0650
0651     x->km.seq = p->seq;
0652     x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
0653     /* sysctl_xfrm_aevent_etime is in 100ms units */
0654     x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
0655
0656     if ((err = xfrm_init_replay(x)))
0657         goto error;
0658
0659     /* override default values from above */
0660     xfrm_update_ae_params(x, attrs, 0);
0661
0662     /* configure the hardware if offload is requested */
0663     if (attrs[XFRMA_OFFLOAD_DEV]) {
0664         err = xfrm_dev_state_add(net, x,
0665                      nla_data(attrs[XFRMA_OFFLOAD_DEV]));
0666         if (err)
0667             goto error;
0668     }
0669
0670     return x;
0671
0672 error:
0673     x->km.state = XFRM_STATE_DEAD;
0674     xfrm_state_put(x);
0675 error_no_put:
0676     *errp = err;
0677     return NULL;
0678 }
0679
0680 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
0681         struct nlattr **attrs)
0682 {
0683     struct net *net = sock_net(skb->sk);
0684     struct xfrm_usersa_info *p = nlmsg_data(nlh);
0685     struct xfrm_state *x;
0686     int err;
0687     struct km_event c;
0688
0689     err = verify_newsa_info(p, attrs);
0690     if (err)
0691         return err;
0692
0693     x = xfrm_state_construct(net, p, attrs, &err);
0694     if (!x)
0695         return err;
0696
0697     xfrm_state_hold(x);
0698     if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
0699         err = xfrm_state_add(x);
0700     else
0701         err = xfrm_state_update(x);
0702
0703     xfrm_audit_state_add(x, err ? 0 : 1, true);
0704
0705     if (err < 0) {
0706         x->km.state = XFRM_STATE_DEAD;
0707         xfrm_dev_state_delete(x);
0708         __xfrm_state_put(x);
0709         goto out;
0710     }
0711
0712     if (x->km.state == XFRM_STATE_VOID)
0713         x->km.state = XFRM_STATE_VALID;
0714
0715     c.seq = nlh->nlmsg_seq;
0716     c.portid = nlh->nlmsg_pid;
0717     c.event = nlh->nlmsg_type;
0718
0719     km_state_notify(x, &c);
0720 out:
0721     xfrm_state_put(x);
0722     return err;
0723 }
0724
0725 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
0726                          struct xfrm_usersa_id *p,
0727                          struct nlattr **attrs,
0728                          int *errp)
0729 {
0730     struct xfrm_state *x = NULL;
0731     struct xfrm_mark m;
0732     int err;
0733     u32 mark = xfrm_mark_get(attrs, &m);
0734
0735     if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
0736         err = -ESRCH;
0737         x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
0738     } else {
0739         xfrm_address_t *saddr = NULL;
0740
0741         verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
0742         if (!saddr) {
0743             err = -EINVAL;
0744             goto out;
0745         }
0746
0747         err = -ESRCH;
0748         x = xfrm_state_lookup_byaddr(net, mark,
0749                          &p->daddr, saddr,
0750                          p->proto, p->family);
0751     }
0752
0753  out:
0754     if (!x && errp)
0755         *errp = err;
0756     return x;
0757 }
0758
0759 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
0760         struct nlattr **attrs)
0761 {
0762     struct net *net = sock_net(skb->sk);
0763     struct xfrm_state *x;
0764     int err = -ESRCH;
0765     struct km_event c;
0766     struct xfrm_usersa_id *p = nlmsg_data(nlh);
0767
0768     x = xfrm_user_state_lookup(net, p, attrs, &err);
0769     if (x == NULL)
0770         return err;
0771
0772     if ((err = security_xfrm_state_delete(x)) != 0)
0773         goto out;
0774
0775     if (xfrm_state_kern(x)) {
0776         err = -EPERM;
0777         goto out;
0778     }
0779
0780     err = xfrm_state_delete(x);
0781
0782     if (err < 0)
0783         goto out;
0784
0785     c.seq = nlh->nlmsg_seq;
0786     c.portid = nlh->nlmsg_pid;
0787     c.event = nlh->nlmsg_type;
0788     km_state_notify(x, &c);
0789
0790 out:
0791     xfrm_audit_state_delete(x, err ? 0 : 1, true);
0792     xfrm_state_put(x);
0793     return err;
0794 }
0795
0796 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
0797 {
0798     memset(p, 0, sizeof(*p));
0799     memcpy(&p->id, &x->id, sizeof(p->id));
0800     memcpy(&p->sel, &x->sel, sizeof(p->sel));
0801     memcpy(&p->lft, &x->lft, sizeof(p->lft));
0802     memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
0803     put_unaligned(x->stats.replay_window, &p->stats.replay_window);
0804     put_unaligned(x->stats.replay, &p->stats.replay);
0805     put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
0806     memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
0807     p->mode = x->props.mode;
0808     p->replay_window = x->props.replay_window;
0809     p->reqid = x->props.reqid;
0810     p->family = x->props.family;
0811     p->flags = x->props.flags;
0812     p->seq = x->km.seq;
0813 }
0814
0815 struct xfrm_dump_info {
0816     struct sk_buff *in_skb;
0817     struct sk_buff *out_skb;
0818     u32 nlmsg_seq;
0819     u16 nlmsg_flags;
0820 };
0821
0822 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
0823 {
0824     struct xfrm_user_sec_ctx *uctx;
0825     struct nlattr *attr;
0826     int ctx_size = sizeof(*uctx) + s->ctx_len;
0827
0828     attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
0829     if (attr == NULL)
0830         return -EMSGSIZE;
0831
0832     uctx = nla_data(attr);
0833     uctx->exttype = XFRMA_SEC_CTX;
0834     uctx->len = ctx_size;
0835     uctx->ctx_doi = s->ctx_doi;
0836     uctx->ctx_alg = s->ctx_alg;
0837     uctx->ctx_len = s->ctx_len;
0838     memcpy(uctx + 1, s->ctx_str, s->ctx_len);
0839
0840     return 0;
0841 }
0842
0843 static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb)
0844 {
0845     struct xfrm_user_offload *xuo;
0846     struct nlattr *attr;
0847
0848     attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
0849     if (attr == NULL)
0850         return -EMSGSIZE;
0851
0852     xuo = nla_data(attr);
0853     memset(xuo, 0, sizeof(*xuo));
0854     xuo->ifindex = xso->dev->ifindex;
0855     if (xso->dir == XFRM_DEV_OFFLOAD_IN)
0856         xuo->flags = XFRM_OFFLOAD_INBOUND;
0857
0858     return 0;
0859 }
0860
0861 static bool xfrm_redact(void)
0862 {
0863     return IS_ENABLED(CONFIG_SECURITY) &&
0864         security_locked_down(LOCKDOWN_XFRM_SECRET);
0865 }
0866
0867 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
0868 {
0869     struct xfrm_algo *algo;
0870     struct xfrm_algo_auth *ap;
0871     struct nlattr *nla;
0872     bool redact_secret = xfrm_redact();
0873
0874     nla = nla_reserve(skb, XFRMA_ALG_AUTH,
0875               sizeof(*algo) + (auth->alg_key_len + 7) / 8);
0876     if (!nla)
0877         return -EMSGSIZE;
0878     algo = nla_data(nla);
0879     strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
0880
0881     if (redact_secret && auth->alg_key_len)
0882         memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8);
0883     else
0884         memcpy(algo->alg_key, auth->alg_key,
0885                (auth->alg_key_len + 7) / 8);
0886     algo->alg_key_len = auth->alg_key_len;
0887
0888     nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth));
0889     if (!nla)
0890         return -EMSGSIZE;
0891     ap = nla_data(nla);
0892     memcpy(ap, auth, sizeof(struct xfrm_algo_auth));
0893     if (redact_secret && auth->alg_key_len)
0894         memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
0895     else
0896         memcpy(ap->alg_key, auth->alg_key,
0897                (auth->alg_key_len + 7) / 8);
0898     return 0;
0899 }
0900
0901 static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb)
0902 {
0903     struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead));
0904     struct xfrm_algo_aead *ap;
0905     bool redact_secret = xfrm_redact();
0906
0907     if (!nla)
0908         return -EMSGSIZE;
0909
0910     ap = nla_data(nla);
0911     memcpy(ap, aead, sizeof(*aead));
0912
0913     if (redact_secret && aead->alg_key_len)
0914         memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8);
0915     else
0916         memcpy(ap->alg_key, aead->alg_key,
0917                (aead->alg_key_len + 7) / 8);
0918     return 0;
0919 }
0920
0921 static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb)
0922 {
0923     struct xfrm_algo *ap;
0924     bool redact_secret = xfrm_redact();
0925     struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT,
0926                      xfrm_alg_len(ealg));
0927     if (!nla)
0928         return -EMSGSIZE;
0929
0930     ap = nla_data(nla);
0931     memcpy(ap, ealg, sizeof(*ealg));
0932
0933     if (redact_secret && ealg->alg_key_len)
0934         memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8);
0935     else
0936         memcpy(ap->alg_key, ealg->alg_key,
0937                (ealg->alg_key_len + 7) / 8);
0938
0939     return 0;
0940 }
0941
0942 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
0943 {
0944     int ret = 0;
0945
0946     if (m->v | m->m) {
0947         ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
0948         if (!ret)
0949             ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
0950     }
0951     return ret;
0952 }
0953
0954 /* Don't change this without updating xfrm_sa_len! */
0955 static int copy_to_user_state_extra(struct xfrm_state *x,
0956                     struct xfrm_usersa_info *p,
0957                     struct sk_buff *skb)
0958 {
0959     int ret = 0;
0960
0961     copy_to_user_state(x, p);
0962
0963     if (x->props.extra_flags) {
0964         ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
0965                   x->props.extra_flags);
0966         if (ret)
0967             goto out;
0968     }
0969
0970     if (x->coaddr) {
0971         ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
0972         if (ret)
0973             goto out;
0974     }
0975     if (x->lastused) {
0976         ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
0977                     XFRMA_PAD);
0978         if (ret)
0979             goto out;
0980     }
0981     if (x->aead) {
0982         ret = copy_to_user_aead(x->aead, skb);
0983         if (ret)
0984             goto out;
0985     }
0986     if (x->aalg) {
0987         ret = copy_to_user_auth(x->aalg, skb);
0988         if (ret)
0989             goto out;
0990     }
0991     if (x->ealg) {
0992         ret = copy_to_user_ealg(x->ealg, skb);
0993         if (ret)
0994             goto out;
0995     }
0996     if (x->calg) {
0997         ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
0998         if (ret)
0999             goto out;
1000     }
1001     if (x->encap) {
1002         ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
1003         if (ret)
1004             goto out;
1005     }
1006     if (x->tfcpad) {
1007         ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
1008         if (ret)
1009             goto out;
1010     }
1011     ret = xfrm_mark_put(skb, &x->mark);
1012     if (ret)
1013         goto out;
1014
1015     ret = xfrm_smark_put(skb, &x->props.smark);
1016     if (ret)
1017         goto out;
1018
1019     if (x->replay_esn)
1020         ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1021                   xfrm_replay_state_esn_len(x->replay_esn),
1022                   x->replay_esn);
1023     else
1024         ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1025                   &x->replay);
1026     if (ret)
1027         goto out;
1028     if(x->xso.dev)
1029         ret = copy_user_offload(&x->xso, skb);
1030     if (ret)
1031         goto out;
1032     if (x->if_id) {
1033         ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
1034         if (ret)
1035             goto out;
1036     }
1037     if (x->security) {
1038         ret = copy_sec_ctx(x->security, skb);
1039         if (ret)
1040             goto out;
1041     }
1042     if (x->mapping_maxage)
1043         ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage);
1044 out:
1045     return ret;
1046 }
1047
1048 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
1049 {
1050     struct xfrm_dump_info *sp = ptr;
1051     struct sk_buff *in_skb = sp->in_skb;
1052     struct sk_buff *skb = sp->out_skb;
1053     struct xfrm_translator *xtr;
1054     struct xfrm_usersa_info *p;
1055     struct nlmsghdr *nlh;
1056     int err;
1057
1058     nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1059             XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
1060     if (nlh == NULL)
1061         return -EMSGSIZE;
1062
1063     p = nlmsg_data(nlh);
1064
1065     err = copy_to_user_state_extra(x, p, skb);
1066     if (err) {
1067         nlmsg_cancel(skb, nlh);
1068         return err;
1069     }
1070     nlmsg_end(skb, nlh);
1071
1072     xtr = xfrm_get_translator();
1073     if (xtr) {
1074         err = xtr->alloc_compat(skb, nlh);
1075
1076         xfrm_put_translator(xtr);
1077         if (err) {
1078             nlmsg_cancel(skb, nlh);
1079             return err;
1080         }
1081     }
1082
1083     return 0;
1084 }
1085
1086 static int xfrm_dump_sa_done(struct netlink_callback *cb)
1087 {
1088     struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1089     struct sock *sk = cb->skb->sk;
1090     struct net *net = sock_net(sk);
1091
1092     if (cb->args[0])
1093         xfrm_state_walk_done(walk, net);
1094     return 0;
1095 }
1096
1097 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1098 {
1099     struct net *net = sock_net(skb->sk);
1100     struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1101     struct xfrm_dump_info info;
1102
1103     BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1104              sizeof(cb->args) - sizeof(cb->args[0]));
1105
1106     info.in_skb = cb->skb;
1107     info.out_skb = skb;
1108     info.nlmsg_seq = cb->nlh->nlmsg_seq;
1109     info.nlmsg_flags = NLM_F_MULTI;
1110
1111     if (!cb->args[0]) {
1112         struct nlattr *attrs[XFRMA_MAX+1];
1113         struct xfrm_address_filter *filter = NULL;
1114         u8 proto = 0;
1115         int err;
1116
1117         err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1118                          xfrma_policy, cb->extack);
1119         if (err < 0)
1120             return err;
1121
1122         if (attrs[XFRMA_ADDRESS_FILTER]) {
1123             filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1124                      sizeof(*filter), GFP_KERNEL);
1125             if (filter == NULL)
1126                 return -ENOMEM;
1127         }
1128
1129         if (attrs[XFRMA_PROTO])
1130             proto = nla_get_u8(attrs[XFRMA_PROTO]);
1131
1132         xfrm_state_walk_init(walk, proto, filter);
1133         cb->args[0] = 1;
1134     }
1135
1136     (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1137
1138     return skb->len;
1139 }
1140
1141 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1142                       struct xfrm_state *x, u32 seq)
1143 {
1144     struct xfrm_dump_info info;
1145     struct sk_buff *skb;
1146     int err;
1147
1148     skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1149     if (!skb)
1150         return ERR_PTR(-ENOMEM);
1151
1152     info.in_skb = in_skb;
1153     info.out_skb = skb;
1154     info.nlmsg_seq = seq;
1155     info.nlmsg_flags = 0;
1156
1157     err = dump_one_state(x, 0, &info);
1158     if (err) {
1159         kfree_skb(skb);
1160         return ERR_PTR(err);
1161     }
1162
1163     return skb;
1164 }
1165
1166 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1167  * Must be called with RCU read lock.
1168  */
1169 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1170                        u32 pid, unsigned int group)
1171 {
1172     struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1173     struct xfrm_translator *xtr;
1174
1175     if (!nlsk) {
1176         kfree_skb(skb);
1177         return -EPIPE;
1178     }
1179
1180     xtr = xfrm_get_translator();
1181     if (xtr) {
1182         int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1183
1184         xfrm_put_translator(xtr);
1185         if (err) {
1186             kfree_skb(skb);
1187             return err;
1188         }
1189     }
1190
1191     return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1192 }
1193
1194 static inline unsigned int xfrm_spdinfo_msgsize(void)
1195 {
1196     return NLMSG_ALIGN(4)
1197            + nla_total_size(sizeof(struct xfrmu_spdinfo))
1198            + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1199            + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1200            + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1201 }
1202
1203 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1204              u32 portid, u32 seq, u32 flags)
1205 {
1206     struct xfrmk_spdinfo si;
1207     struct xfrmu_spdinfo spc;
1208     struct xfrmu_spdhinfo sph;
1209     struct xfrmu_spdhthresh spt4, spt6;
1210     struct nlmsghdr *nlh;
1211     int err;
1212     u32 *f;
1213     unsigned lseq;
1214
1215     nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1216     if (nlh == NULL) /* shouldn't really happen ... */
1217         return -EMSGSIZE;
1218
1219     f = nlmsg_data(nlh);
1220     *f = flags;
1221     xfrm_spd_getinfo(net, &si);
1222     spc.incnt = si.incnt;
1223     spc.outcnt = si.outcnt;
1224     spc.fwdcnt = si.fwdcnt;
1225     spc.inscnt = si.inscnt;
1226     spc.outscnt = si.outscnt;
1227     spc.fwdscnt = si.fwdscnt;
1228     sph.spdhcnt = si.spdhcnt;
1229     sph.spdhmcnt = si.spdhmcnt;
1230
1231     do {
1232         lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1233
1234         spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1235         spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1236         spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1237         spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1238     } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1239
1240     err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1241     if (!err)
1242         err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1243     if (!err)
1244         err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1245     if (!err)
1246         err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1247     if (err) {
1248         nlmsg_cancel(skb, nlh);
1249         return err;
1250     }
1251
1252     nlmsg_end(skb, nlh);
1253     return 0;
1254 }
1255
1256 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1257                 struct nlattr **attrs)
1258 {
1259     struct net *net = sock_net(skb->sk);
1260     struct xfrmu_spdhthresh *thresh4 = NULL;
1261     struct xfrmu_spdhthresh *thresh6 = NULL;
1262
1263     /* selector prefixlen thresholds to hash policies */
1264     if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1265         struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1266
1267         if (nla_len(rta) < sizeof(*thresh4))
1268             return -EINVAL;
1269         thresh4 = nla_data(rta);
1270         if (thresh4->lbits > 32 || thresh4->rbits > 32)
1271             return -EINVAL;
1272     }
1273     if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1274         struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1275
1276         if (nla_len(rta) < sizeof(*thresh6))
1277             return -EINVAL;
1278         thresh6 = nla_data(rta);
1279         if (thresh6->lbits > 128 || thresh6->rbits > 128)
1280             return -EINVAL;
1281     }
1282
1283     if (thresh4 || thresh6) {
1284         write_seqlock(&net->xfrm.policy_hthresh.lock);
1285         if (thresh4) {
1286             net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1287             net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1288         }
1289         if (thresh6) {
1290             net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1291             net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1292         }
1293         write_sequnlock(&net->xfrm.policy_hthresh.lock);
1294
1295         xfrm_policy_hash_rebuild(net);
1296     }
1297
1298     return 0;
1299 }
1300
1301 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1302         struct nlattr **attrs)
1303 {
1304     struct net *net = sock_net(skb->sk);
1305     struct sk_buff *r_skb;
1306     u32 *flags = nlmsg_data(nlh);
1307     u32 sportid = NETLINK_CB(skb).portid;
1308     u32 seq = nlh->nlmsg_seq;
1309     int err;
1310
1311     r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1312     if (r_skb == NULL)
1313         return -ENOMEM;
1314
1315     err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1316     BUG_ON(err < 0);
1317
1318     return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1319 }
1320
1321 static inline unsigned int xfrm_sadinfo_msgsize(void)
1322 {
1323     return NLMSG_ALIGN(4)
1324            + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1325            + nla_total_size(4); /* XFRMA_SAD_CNT */
1326 }
1327
1328 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1329              u32 portid, u32 seq, u32 flags)
1330 {
1331     struct xfrmk_sadinfo si;
1332     struct xfrmu_sadhinfo sh;
1333     struct nlmsghdr *nlh;
1334     int err;
1335     u32 *f;
1336
1337     nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1338     if (nlh == NULL) /* shouldn't really happen ... */
1339         return -EMSGSIZE;
1340
1341     f = nlmsg_data(nlh);
1342     *f = flags;
1343     xfrm_sad_getinfo(net, &si);
1344
1345     sh.sadhmcnt = si.sadhmcnt;
1346     sh.sadhcnt = si.sadhcnt;
1347
1348     err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1349     if (!err)
1350         err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1351     if (err) {
1352         nlmsg_cancel(skb, nlh);
1353         return err;
1354     }
1355
1356     nlmsg_end(skb, nlh);
1357     return 0;
1358 }
1359
1360 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1361         struct nlattr **attrs)
1362 {
1363     struct net *net = sock_net(skb->sk);
1364     struct sk_buff *r_skb;
1365     u32 *flags = nlmsg_data(nlh);
1366     u32 sportid = NETLINK_CB(skb).portid;
1367     u32 seq = nlh->nlmsg_seq;
1368     int err;
1369
1370     r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1371     if (r_skb == NULL)
1372         return -ENOMEM;
1373
1374     err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1375     BUG_ON(err < 0);
1376
1377     return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1378 }
1379
1380 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1381         struct nlattr **attrs)
1382 {
1383     struct net *net = sock_net(skb->sk);
1384     struct xfrm_usersa_id *p = nlmsg_data(nlh);
1385     struct xfrm_state *x;
1386     struct sk_buff *resp_skb;
1387     int err = -ESRCH;
1388
1389     x = xfrm_user_state_lookup(net, p, attrs, &err);
1390     if (x == NULL)
1391         goto out_noput;
1392
1393     resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1394     if (IS_ERR(resp_skb)) {
1395         err = PTR_ERR(resp_skb);
1396     } else {
1397         err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1398     }
1399     xfrm_state_put(x);
1400 out_noput:
1401     return err;
1402 }
1403
1404 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1405         struct nlattr **attrs)
1406 {
1407     struct net *net = sock_net(skb->sk);
1408     struct xfrm_state *x;
1409     struct xfrm_userspi_info *p;
1410     struct xfrm_translator *xtr;
1411     struct sk_buff *resp_skb;
1412     xfrm_address_t *daddr;
1413     int family;
1414     int err;
1415     u32 mark;
1416     struct xfrm_mark m;
1417     u32 if_id = 0;
1418
1419     p = nlmsg_data(nlh);
1420     err = verify_spi_info(p->info.id.proto, p->min, p->max);
1421     if (err)
1422         goto out_noput;
1423
1424     family = p->info.family;
1425     daddr = &p->info.id.daddr;
1426
1427     x = NULL;
1428
1429     mark = xfrm_mark_get(attrs, &m);
1430
1431     if (attrs[XFRMA_IF_ID])
1432         if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1433
1434     if (p->info.seq) {
1435         x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1436         if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1437             xfrm_state_put(x);
1438             x = NULL;
1439         }
1440     }
1441
1442     if (!x)
1443         x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1444                   if_id, p->info.id.proto, daddr,
1445                   &p->info.saddr, 1,
1446                   family);
1447     err = -ENOENT;
1448     if (x == NULL)
1449         goto out_noput;
1450
1451     err = xfrm_alloc_spi(x, p->min, p->max);
1452     if (err)
1453         goto out;
1454
1455     resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1456     if (IS_ERR(resp_skb)) {
1457         err = PTR_ERR(resp_skb);
1458         goto out;
1459     }
1460
1461     xtr = xfrm_get_translator();
1462     if (xtr) {
1463         err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1464
1465         xfrm_put_translator(xtr);
1466         if (err) {
1467             kfree_skb(resp_skb);
1468             goto out;
1469         }
1470     }
1471
1472     err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1473
1474 out:
1475     xfrm_state_put(x);
1476 out_noput:
1477     return err;
1478 }
1479
1480 static int verify_policy_dir(u8 dir)
1481 {
1482     switch (dir) {
1483     case XFRM_POLICY_IN:
1484     case XFRM_POLICY_OUT:
1485     case XFRM_POLICY_FWD:
1486         break;
1487
1488     default:
1489         return -EINVAL;
1490     }
1491
1492     return 0;
1493 }
1494
1495 static int verify_policy_type(u8 type)
1496 {
1497     switch (type) {
1498     case XFRM_POLICY_TYPE_MAIN:
1499 #ifdef CONFIG_XFRM_SUB_POLICY
1500     case XFRM_POLICY_TYPE_SUB:
1501 #endif
1502         break;
1503
1504     default:
1505         return -EINVAL;
1506     }
1507
1508     return 0;
1509 }
1510
1511 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1512 {
1513     int ret;
1514
1515     switch (p->share) {
1516     case XFRM_SHARE_ANY:
1517     case XFRM_SHARE_SESSION:
1518     case XFRM_SHARE_USER:
1519     case XFRM_SHARE_UNIQUE:
1520         break;
1521
1522     default:
1523         return -EINVAL;
1524     }
1525
1526     switch (p->action) {
1527     case XFRM_POLICY_ALLOW:
1528     case XFRM_POLICY_BLOCK:
1529         break;
1530
1531     default:
1532         return -EINVAL;
1533     }
1534
1535     switch (p->sel.family) {
1536     case AF_INET:
1537         if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1538             return -EINVAL;
1539
1540         break;
1541
1542     case AF_INET6:
1543 #if IS_ENABLED(CONFIG_IPV6)
1544         if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1545             return -EINVAL;
1546
1547         break;
1548 #else
1549         return  -EAFNOSUPPORT;
1550 #endif
1551
1552     default:
1553         return -EINVAL;
1554     }
1555
1556     ret = verify_policy_dir(p->dir);
1557     if (ret)
1558         return ret;
1559     if (p->index && (xfrm_policy_id2dir(p->index) != p->dir))
1560         return -EINVAL;
1561
1562     return 0;
1563 }
1564
1565 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1566 {
1567     struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1568     struct xfrm_user_sec_ctx *uctx;
1569
1570     if (!rt)
1571         return 0;
1572
1573     uctx = nla_data(rt);
1574     return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1575 }
1576
1577 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1578                int nr)
1579 {
1580     int i;
1581
1582     xp->xfrm_nr = nr;
1583     for (i = 0; i < nr; i++, ut++) {
1584         struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1585
1586         memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1587         memcpy(&t->saddr, &ut->saddr,
1588                sizeof(xfrm_address_t));
1589         t->reqid = ut->reqid;
1590         t->mode = ut->mode;
1591         t->share = ut->share;
1592         t->optional = ut->optional;
1593         t->aalgos = ut->aalgos;
1594         t->ealgos = ut->ealgos;
1595         t->calgos = ut->calgos;
1596         /* If all masks are ~0, then we allow all algorithms. */
1597         t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1598         t->encap_family = ut->family;
1599     }
1600 }
1601
1602 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1603 {
1604     u16 prev_family;
1605     int i;
1606
1607     if (nr > XFRM_MAX_DEPTH)
1608         return -EINVAL;
1609
1610     prev_family = family;
1611
1612     for (i = 0; i < nr; i++) {
1613         /* We never validated the ut->family value, so many
1614          * applications simply leave it at zero.  The check was
1615          * never made and ut->family was ignored because all
1616          * templates could be assumed to have the same family as
1617          * the policy itself.  Now that we will have ipv4-in-ipv6
1618          * and ipv6-in-ipv4 tunnels, this is no longer true.
1619          */
1620         if (!ut[i].family)
1621             ut[i].family = family;
1622
1623         switch (ut[i].mode) {
1624         case XFRM_MODE_TUNNEL:
1625         case XFRM_MODE_BEET:
1626             break;
1627         default:
1628             if (ut[i].family != prev_family)
1629                 return -EINVAL;
1630             break;
1631         }
1632         if (ut[i].mode >= XFRM_MODE_MAX)
1633             return -EINVAL;
1634
1635         prev_family = ut[i].family;
1636
1637         switch (ut[i].family) {
1638         case AF_INET:
1639             break;
1640 #if IS_ENABLED(CONFIG_IPV6)
1641         case AF_INET6:
1642             break;
1643 #endif
1644         default:
1645             return -EINVAL;
1646         }
1647
1648         if (!xfrm_id_proto_valid(ut[i].id.proto))
1649             return -EINVAL;
1650     }
1651
1652     return 0;
1653 }
1654
1655 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1656 {
1657     struct nlattr *rt = attrs[XFRMA_TMPL];
1658
1659     if (!rt) {
1660         pol->xfrm_nr = 0;
1661     } else {
1662         struct xfrm_user_tmpl *utmpl = nla_data(rt);
1663         int nr = nla_len(rt) / sizeof(*utmpl);
1664         int err;
1665
1666         err = validate_tmpl(nr, utmpl, pol->family);
1667         if (err)
1668             return err;
1669
1670         copy_templates(pol, utmpl, nr);
1671     }
1672     return 0;
1673 }
1674
1675 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1676 {
1677     struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1678     struct xfrm_userpolicy_type *upt;
1679     u8 type = XFRM_POLICY_TYPE_MAIN;
1680     int err;
1681
1682     if (rt) {
1683         upt = nla_data(rt);
1684         type = upt->type;
1685     }
1686
1687     err = verify_policy_type(type);
1688     if (err)
1689         return err;
1690
1691     *tp = type;
1692     return 0;
1693 }
1694
1695 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1696 {
1697     xp->priority = p->priority;
1698     xp->index = p->index;
1699     memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1700     memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1701     xp->action = p->action;
1702     xp->flags = p->flags;
1703     xp->family = p->sel.family;
1704     /* XXX xp->share = p->share; */
1705 }
1706
1707 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1708 {
1709     memset(p, 0, sizeof(*p));
1710     memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1711     memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1712     memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1713     p->priority = xp->priority;
1714     p->index = xp->index;
1715     p->sel.family = xp->family;
1716     p->dir = dir;
1717     p->action = xp->action;
1718     p->flags = xp->flags;
1719     p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1720 }
1721
1722 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1723 {
1724     struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1725     int err;
1726
1727     if (!xp) {
1728         *errp = -ENOMEM;
1729         return NULL;
1730     }
1731
1732     copy_from_user_policy(xp, p);
1733
1734     err = copy_from_user_policy_type(&xp->type, attrs);
1735     if (err)
1736         goto error;
1737
1738     if (!(err = copy_from_user_tmpl(xp, attrs)))
1739         err = copy_from_user_sec_ctx(xp, attrs);
1740     if (err)
1741         goto error;
1742
1743     xfrm_mark_get(attrs, &xp->mark);
1744
1745     if (attrs[XFRMA_IF_ID])
1746         xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1747
1748     return xp;
1749  error:
1750     *errp = err;
1751     xp->walk.dead = 1;
1752     xfrm_policy_destroy(xp);
1753     return NULL;
1754 }
1755
1756 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1757         struct nlattr **attrs)
1758 {
1759     struct net *net = sock_net(skb->sk);
1760     struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1761     struct xfrm_policy *xp;
1762     struct km_event c;
1763     int err;
1764     int excl;
1765
1766     err = verify_newpolicy_info(p);
1767     if (err)
1768         return err;
1769     err = verify_sec_ctx_len(attrs);
1770     if (err)
1771         return err;
1772
1773     xp = xfrm_policy_construct(net, p, attrs, &err);
1774     if (!xp)
1775         return err;
1776
1777     /* shouldn't excl be based on nlh flags??
1778      * Aha! this is anti-netlink really i.e  more pfkey derived
1779      * in netlink excl is a flag and you wouldn't need
1780      * a type XFRM_MSG_UPDPOLICY - JHS */
1781     excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1782     err = xfrm_policy_insert(p->dir, xp, excl);
1783     xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1784
1785     if (err) {
1786         security_xfrm_policy_free(xp->security);
1787         kfree(xp);
1788         return err;
1789     }
1790
1791     c.event = nlh->nlmsg_type;
1792     c.seq = nlh->nlmsg_seq;
1793     c.portid = nlh->nlmsg_pid;
1794     km_policy_notify(xp, p->dir, &c);
1795
1796     xfrm_pol_put(xp);
1797
1798     return 0;
1799 }
1800
1801 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1802 {
1803     struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1804     int i;
1805
1806     if (xp->xfrm_nr == 0)
1807         return 0;
1808
1809     for (i = 0; i < xp->xfrm_nr; i++) {
1810         struct xfrm_user_tmpl *up = &vec[i];
1811         struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1812
1813         memset(up, 0, sizeof(*up));
1814         memcpy(&up->id, &kp->id, sizeof(up->id));
1815         up->family = kp->encap_family;
1816         memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1817         up->reqid = kp->reqid;
1818         up->mode = kp->mode;
1819         up->share = kp->share;
1820         up->optional = kp->optional;
1821         up->aalgos = kp->aalgos;
1822         up->ealgos = kp->ealgos;
1823         up->calgos = kp->calgos;
1824     }
1825
1826     return nla_put(skb, XFRMA_TMPL,
1827                sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1828 }
1829
1830 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1831 {
1832     if (x->security) {
1833         return copy_sec_ctx(x->security, skb);
1834     }
1835     return 0;
1836 }
1837
1838 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1839 {
1840     if (xp->security)
1841         return copy_sec_ctx(xp->security, skb);
1842     return 0;
1843 }
1844 static inline unsigned int userpolicy_type_attrsize(void)
1845 {
1846 #ifdef CONFIG_XFRM_SUB_POLICY
1847     return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1848 #else
1849     return 0;
1850 #endif
1851 }
1852
1853 #ifdef CONFIG_XFRM_SUB_POLICY
1854 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1855 {
1856     struct xfrm_userpolicy_type upt;
1857
1858     /* Sadly there are two holes in struct xfrm_userpolicy_type */
1859     memset(&upt, 0, sizeof(upt));
1860     upt.type = type;
1861
1862     return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1863 }
1864
1865 #else
1866 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1867 {
1868     return 0;
1869 }
1870 #endif
1871
1872 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1873 {
1874     struct xfrm_dump_info *sp = ptr;
1875     struct xfrm_userpolicy_info *p;
1876     struct sk_buff *in_skb = sp->in_skb;
1877     struct sk_buff *skb = sp->out_skb;
1878     struct xfrm_translator *xtr;
1879     struct nlmsghdr *nlh;
1880     int err;
1881
1882     nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1883             XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1884     if (nlh == NULL)
1885         return -EMSGSIZE;
1886
1887     p = nlmsg_data(nlh);
1888     copy_to_user_policy(xp, p, dir);
1889     err = copy_to_user_tmpl(xp, skb);
1890     if (!err)
1891         err = copy_to_user_sec_ctx(xp, skb);
1892     if (!err)
1893         err = copy_to_user_policy_type(xp->type, skb);
1894     if (!err)
1895         err = xfrm_mark_put(skb, &xp->mark);
1896     if (!err)
1897         err = xfrm_if_id_put(skb, xp->if_id);
1898     if (err) {
1899         nlmsg_cancel(skb, nlh);
1900         return err;
1901     }
1902     nlmsg_end(skb, nlh);
1903
1904     xtr = xfrm_get_translator();
1905     if (xtr) {
1906         err = xtr->alloc_compat(skb, nlh);
1907
1908         xfrm_put_translator(xtr);
1909         if (err) {
1910             nlmsg_cancel(skb, nlh);
1911             return err;
1912         }
1913     }
1914
1915     return 0;
1916 }
1917
1918 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1919 {
1920     struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1921     struct net *net = sock_net(cb->skb->sk);
1922
1923     xfrm_policy_walk_done(walk, net);
1924     return 0;
1925 }
1926
1927 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1928 {
1929     struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1930
1931     BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1932
1933     xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1934     return 0;
1935 }
1936
1937 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1938 {
1939     struct net *net = sock_net(skb->sk);
1940     struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1941     struct xfrm_dump_info info;
1942
1943     info.in_skb = cb->skb;
1944     info.out_skb = skb;
1945     info.nlmsg_seq = cb->nlh->nlmsg_seq;
1946     info.nlmsg_flags = NLM_F_MULTI;
1947
1948     (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1949
1950     return skb->len;
1951 }
1952
1953 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1954                       struct xfrm_policy *xp,
1955                       int dir, u32 seq)
1956 {
1957     struct xfrm_dump_info info;
1958     struct sk_buff *skb;
1959     int err;
1960
1961     skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1962     if (!skb)
1963         return ERR_PTR(-ENOMEM);
1964
1965     info.in_skb = in_skb;
1966     info.out_skb = skb;
1967     info.nlmsg_seq = seq;
1968     info.nlmsg_flags = 0;
1969
1970     err = dump_one_policy(xp, dir, 0, &info);
1971     if (err) {
1972         kfree_skb(skb);
1973         return ERR_PTR(err);
1974     }
1975
1976     return skb;
1977 }
1978
1979 static int xfrm_notify_userpolicy(struct net *net)
1980 {
1981     struct xfrm_userpolicy_default *up;
1982     int len = NLMSG_ALIGN(sizeof(*up));
1983     struct nlmsghdr *nlh;
1984     struct sk_buff *skb;
1985     int err;
1986
1987     skb = nlmsg_new(len, GFP_ATOMIC);
1988     if (skb == NULL)
1989         return -ENOMEM;
1990
1991     nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0);
1992     if (nlh == NULL) {
1993         kfree_skb(skb);
1994         return -EMSGSIZE;
1995     }
1996
1997     up = nlmsg_data(nlh);
1998     up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
1999     up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2000     up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2001
2002     nlmsg_end(skb, nlh);
2003
2004     rcu_read_lock();
2005     err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2006     rcu_read_unlock();
2007
2008     return err;
2009 }
2010
2011 static bool xfrm_userpolicy_is_valid(__u8 policy)
2012 {
2013     return policy == XFRM_USERPOLICY_BLOCK ||
2014            policy == XFRM_USERPOLICY_ACCEPT;
2015 }
2016
2017 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2018                 struct nlattr **attrs)
2019 {
2020     struct net *net = sock_net(skb->sk);
2021     struct xfrm_userpolicy_default *up = nlmsg_data(nlh);
2022
2023     if (xfrm_userpolicy_is_valid(up->in))
2024         net->xfrm.policy_default[XFRM_POLICY_IN] = up->in;
2025
2026     if (xfrm_userpolicy_is_valid(up->fwd))
2027         net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd;
2028
2029     if (xfrm_userpolicy_is_valid(up->out))
2030         net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out;
2031
2032     rt_genid_bump_all(net);
2033
2034     xfrm_notify_userpolicy(net);
2035     return 0;
2036 }
2037
2038 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2039                 struct nlattr **attrs)
2040 {
2041     struct sk_buff *r_skb;
2042     struct nlmsghdr *r_nlh;
2043     struct net *net = sock_net(skb->sk);
2044     struct xfrm_userpolicy_default *r_up;
2045     int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));
2046     u32 portid = NETLINK_CB(skb).portid;
2047     u32 seq = nlh->nlmsg_seq;
2048
2049     r_skb = nlmsg_new(len, GFP_ATOMIC);
2050     if (!r_skb)
2051         return -ENOMEM;
2052
2053     r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0);
2054     if (!r_nlh) {
2055         kfree_skb(r_skb);
2056         return -EMSGSIZE;
2057     }
2058
2059     r_up = nlmsg_data(r_nlh);
2060     r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2061     r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2062     r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2063     nlmsg_end(r_skb, r_nlh);
2064
2065     return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid);
2066 }
2067
2068 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2069         struct nlattr **attrs)
2070 {
2071     struct net *net = sock_net(skb->sk);
2072     struct xfrm_policy *xp;
2073     struct xfrm_userpolicy_id *p;
2074     u8 type = XFRM_POLICY_TYPE_MAIN;
2075     int err;
2076     struct km_event c;
2077     int delete;
2078     struct xfrm_mark m;
2079     u32 if_id = 0;
2080
2081     p = nlmsg_data(nlh);
2082     delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
2083
2084     err = copy_from_user_policy_type(&type, attrs);
2085     if (err)
2086         return err;
2087
2088     err = verify_policy_dir(p->dir);
2089     if (err)
2090         return err;
2091
2092     if (attrs[XFRMA_IF_ID])
2093         if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2094
2095     xfrm_mark_get(attrs, &m);
2096
2097     if (p->index)
2098         xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
2099                       p->index, delete, &err);
2100     else {
2101         struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2102         struct xfrm_sec_ctx *ctx;
2103
2104         err = verify_sec_ctx_len(attrs);
2105         if (err)
2106             return err;
2107
2108         ctx = NULL;
2109         if (rt) {
2110             struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2111
2112             err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2113             if (err)
2114                 return err;
2115         }
2116         xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2117                        &p->sel, ctx, delete, &err);
2118         security_xfrm_policy_free(ctx);
2119     }
2120     if (xp == NULL)
2121         return -ENOENT;
2122
2123     if (!delete) {
2124         struct sk_buff *resp_skb;
2125
2126         resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
2127         if (IS_ERR(resp_skb)) {
2128             err = PTR_ERR(resp_skb);
2129         } else {
2130             err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
2131                         NETLINK_CB(skb).portid);
2132         }
2133     } else {
2134         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2135
2136         if (err != 0)
2137             goto out;
2138
2139         c.data.byid = p->index;
2140         c.event = nlh->nlmsg_type;
2141         c.seq = nlh->nlmsg_seq;
2142         c.portid = nlh->nlmsg_pid;
2143         km_policy_notify(xp, p->dir, &c);
2144     }
2145
2146 out:
2147     xfrm_pol_put(xp);
2148     return err;
2149 }
2150
2151 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2152         struct nlattr **attrs)
2153 {
2154     struct net *net = sock_net(skb->sk);
2155     struct km_event c;
2156     struct xfrm_usersa_flush *p = nlmsg_data(nlh);
2157     int err;
2158
2159     err = xfrm_state_flush(net, p->proto, true, false);
2160     if (err) {
2161         if (err == -ESRCH) /* empty table */
2162             return 0;
2163         return err;
2164     }
2165     c.data.proto = p->proto;
2166     c.event = nlh->nlmsg_type;
2167     c.seq = nlh->nlmsg_seq;
2168     c.portid = nlh->nlmsg_pid;
2169     c.net = net;
2170     km_state_notify(NULL, &c);
2171
2172     return 0;
2173 }
2174
2175 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2176 {
2177     unsigned int replay_size = x->replay_esn ?
2178                   xfrm_replay_state_esn_len(x->replay_esn) :
2179                   sizeof(struct xfrm_replay_state);
2180
2181     return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2182            + nla_total_size(replay_size)
2183            + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2184            + nla_total_size(sizeof(struct xfrm_mark))
2185            + nla_total_size(4) /* XFRM_AE_RTHR */
2186            + nla_total_size(4); /* XFRM_AE_ETHR */
2187 }
2188
2189 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2190 {
2191     struct xfrm_aevent_id *id;
2192     struct nlmsghdr *nlh;
2193     int err;
2194
2195     nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2196     if (nlh == NULL)
2197         return -EMSGSIZE;
2198
2199     id = nlmsg_data(nlh);
2200     memset(&id->sa_id, 0, sizeof(id->sa_id));
2201     memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2202     id->sa_id.spi = x->id.spi;
2203     id->sa_id.family = x->props.family;
2204     id->sa_id.proto = x->id.proto;
2205     memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2206     id->reqid = x->props.reqid;
2207     id->flags = c->data.aevent;
2208
2209     if (x->replay_esn) {
2210         err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2211                   xfrm_replay_state_esn_len(x->replay_esn),
2212                   x->replay_esn);
2213     } else {
2214         err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2215                   &x->replay);
2216     }
2217     if (err)
2218         goto out_cancel;
2219     err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2220                 XFRMA_PAD);
2221     if (err)
2222         goto out_cancel;
2223
2224     if (id->flags & XFRM_AE_RTHR) {
2225         err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2226         if (err)
2227             goto out_cancel;
2228     }
2229     if (id->flags & XFRM_AE_ETHR) {
2230         err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2231                   x->replay_maxage * 10 / HZ);
2232         if (err)
2233             goto out_cancel;
2234     }
2235     err = xfrm_mark_put(skb, &x->mark);
2236     if (err)
2237         goto out_cancel;
2238
2239     err = xfrm_if_id_put(skb, x->if_id);
2240     if (err)
2241         goto out_cancel;
2242
2243     nlmsg_end(skb, nlh);
2244     return 0;
2245
2246 out_cancel:
2247     nlmsg_cancel(skb, nlh);
2248     return err;
2249 }
2250
2251 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2252         struct nlattr **attrs)
2253 {
2254     struct net *net = sock_net(skb->sk);
2255     struct xfrm_state *x;
2256     struct sk_buff *r_skb;
2257     int err;
2258     struct km_event c;
2259     u32 mark;
2260     struct xfrm_mark m;
2261     struct xfrm_aevent_id *p = nlmsg_data(nlh);
2262     struct xfrm_usersa_id *id = &p->sa_id;
2263
2264     mark = xfrm_mark_get(attrs, &m);
2265
2266     x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2267     if (x == NULL)
2268         return -ESRCH;
2269
2270     r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2271     if (r_skb == NULL) {
2272         xfrm_state_put(x);
2273         return -ENOMEM;
2274     }
2275
2276     /*
2277      * XXX: is this lock really needed - none of the other
2278      * gets lock (the concern is things getting updated
2279      * while we are still reading) - jhs
2280     */
2281     spin_lock_bh(&x->lock);
2282     c.data.aevent = p->flags;
2283     c.seq = nlh->nlmsg_seq;
2284     c.portid = nlh->nlmsg_pid;
2285
2286     err = build_aevent(r_skb, x, &c);
2287     BUG_ON(err < 0);
2288
2289     err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2290     spin_unlock_bh(&x->lock);
2291     xfrm_state_put(x);
2292     return err;
2293 }
2294
2295 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2296         struct nlattr **attrs)
2297 {
2298     struct net *net = sock_net(skb->sk);
2299     struct xfrm_state *x;
2300     struct km_event c;
2301     int err = -EINVAL;
2302     u32 mark = 0;
2303     struct xfrm_mark m;
2304     struct xfrm_aevent_id *p = nlmsg_data(nlh);
2305     struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2306     struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2307     struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2308     struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2309     struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2310
2311     if (!lt && !rp && !re && !et && !rt)
2312         return err;
2313
2314     /* pedantic mode - thou shalt sayeth replaceth */
2315     if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2316         return err;
2317
2318     mark = xfrm_mark_get(attrs, &m);
2319
2320     x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2321     if (x == NULL)
2322         return -ESRCH;
2323
2324     if (x->km.state != XFRM_STATE_VALID)
2325         goto out;
2326
2327     err = xfrm_replay_verify_len(x->replay_esn, re);
2328     if (err)
2329         goto out;
2330
2331     spin_lock_bh(&x->lock);
2332     xfrm_update_ae_params(x, attrs, 1);
2333     spin_unlock_bh(&x->lock);
2334
2335     c.event = nlh->nlmsg_type;
2336     c.seq = nlh->nlmsg_seq;
2337     c.portid = nlh->nlmsg_pid;
2338     c.data.aevent = XFRM_AE_CU;
2339     km_state_notify(x, &c);
2340     err = 0;
2341 out:
2342     xfrm_state_put(x);
2343     return err;
2344 }
2345
2346 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2347         struct nlattr **attrs)
2348 {
2349     struct net *net = sock_net(skb->sk);
2350     struct km_event c;
2351     u8 type = XFRM_POLICY_TYPE_MAIN;
2352     int err;
2353
2354     err = copy_from_user_policy_type(&type, attrs);
2355     if (err)
2356         return err;
2357
2358     err = xfrm_policy_flush(net, type, true);
2359     if (err) {
2360         if (err == -ESRCH) /* empty table */
2361             return 0;
2362         return err;
2363     }
2364
2365     c.data.type = type;
2366     c.event = nlh->nlmsg_type;
2367     c.seq = nlh->nlmsg_seq;
2368     c.portid = nlh->nlmsg_pid;
2369     c.net = net;
2370     km_policy_notify(NULL, 0, &c);
2371     return 0;
2372 }
2373
2374 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2375         struct nlattr **attrs)
2376 {
2377     struct net *net = sock_net(skb->sk);
2378     struct xfrm_policy *xp;
2379     struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2380     struct xfrm_userpolicy_info *p = &up->pol;
2381     u8 type = XFRM_POLICY_TYPE_MAIN;
2382     int err = -ENOENT;
2383     struct xfrm_mark m;
2384     u32 if_id = 0;
2385
2386     err = copy_from_user_policy_type(&type, attrs);
2387     if (err)
2388         return err;
2389
2390     err = verify_policy_dir(p->dir);
2391     if (err)
2392         return err;
2393
2394     if (attrs[XFRMA_IF_ID])
2395         if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2396
2397     xfrm_mark_get(attrs, &m);
2398
2399     if (p->index)
2400         xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2401                       0, &err);
2402     else {
2403         struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2404         struct xfrm_sec_ctx *ctx;
2405
2406         err = verify_sec_ctx_len(attrs);
2407         if (err)
2408             return err;
2409
2410         ctx = NULL;
2411         if (rt) {
2412             struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2413
2414             err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2415             if (err)
2416                 return err;
2417         }
2418         xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2419                        &p->sel, ctx, 0, &err);
2420         security_xfrm_policy_free(ctx);
2421     }
2422     if (xp == NULL)
2423         return -ENOENT;
2424
2425     if (unlikely(xp->walk.dead))
2426         goto out;
2427
2428     err = 0;
2429     if (up->hard) {
2430         xfrm_policy_delete(xp, p->dir);
2431         xfrm_audit_policy_delete(xp, 1, true);
2432     }
2433     km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2434
2435 out:
2436     xfrm_pol_put(xp);
2437     return err;
2438 }
2439
2440 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2441         struct nlattr **attrs)
2442 {
2443     struct net *net = sock_net(skb->sk);
2444     struct xfrm_state *x;
2445     int err;
2446     struct xfrm_user_expire *ue = nlmsg_data(nlh);
2447     struct xfrm_usersa_info *p = &ue->state;
2448     struct xfrm_mark m;
2449     u32 mark = xfrm_mark_get(attrs, &m);
2450
2451     x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2452
2453     err = -ENOENT;
2454     if (x == NULL)
2455         return err;
2456
2457     spin_lock_bh(&x->lock);
2458     err = -EINVAL;
2459     if (x->km.state != XFRM_STATE_VALID)
2460         goto out;
2461     km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2462
2463     if (ue->hard) {
2464         __xfrm_state_delete(x);
2465         xfrm_audit_state_delete(x, 1, true);
2466     }
2467     err = 0;
2468 out:
2469     spin_unlock_bh(&x->lock);
2470     xfrm_state_put(x);
2471     return err;
2472 }
2473
2474 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2475         struct nlattr **attrs)
2476 {
2477     struct net *net = sock_net(skb->sk);
2478     struct xfrm_policy *xp;
2479     struct xfrm_user_tmpl *ut;
2480     int i;
2481     struct nlattr *rt = attrs[XFRMA_TMPL];
2482     struct xfrm_mark mark;
2483
2484     struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2485     struct xfrm_state *x = xfrm_state_alloc(net);
2486     int err = -ENOMEM;
2487
2488     if (!x)
2489         goto nomem;
2490
2491     xfrm_mark_get(attrs, &mark);
2492
2493     err = verify_newpolicy_info(&ua->policy);
2494     if (err)
2495         goto free_state;
2496     err = verify_sec_ctx_len(attrs);
2497     if (err)
2498         goto free_state;
2499
2500     /*   build an XP */
2501     xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2502     if (!xp)
2503         goto free_state;
2504
2505     memcpy(&x->id, &ua->id, sizeof(ua->id));
2506     memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2507     memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2508     xp->mark.m = x->mark.m = mark.m;
2509     xp->mark.v = x->mark.v = mark.v;
2510     ut = nla_data(rt);
2511     /* extract the templates and for each call km_key */
2512     for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2513         struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2514         memcpy(&x->id, &t->id, sizeof(x->id));
2515         x->props.mode = t->mode;
2516         x->props.reqid = t->reqid;
2517         x->props.family = ut->family;
2518         t->aalgos = ua->aalgos;
2519         t->ealgos = ua->ealgos;
2520         t->calgos = ua->calgos;
2521         err = km_query(x, t, xp);
2522
2523     }
2524
2525     xfrm_state_free(x);
2526     kfree(xp);
2527
2528     return 0;
2529
2530 free_state:
2531     xfrm_state_free(x);
2532 nomem:
2533     return err;
2534 }
2535
2536 #ifdef CONFIG_XFRM_MIGRATE
2537 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2538                   struct xfrm_kmaddress *k,
2539                   struct nlattr **attrs, int *num)
2540 {
2541     struct nlattr *rt = attrs[XFRMA_MIGRATE];
2542     struct xfrm_user_migrate *um;
2543     int i, num_migrate;
2544
2545     if (k != NULL) {
2546         struct xfrm_user_kmaddress *uk;
2547
2548         uk = nla_data(attrs[XFRMA_KMADDRESS]);
2549         memcpy(&k->local, &uk->local, sizeof(k->local));
2550         memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2551         k->family = uk->family;
2552         k->reserved = uk->reserved;
2553     }
2554
2555     um = nla_data(rt);
2556     num_migrate = nla_len(rt) / sizeof(*um);
2557
2558     if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2559         return -EINVAL;
2560
2561     for (i = 0; i < num_migrate; i++, um++, ma++) {
2562         memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2563         memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2564         memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2565         memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2566
2567         ma->proto = um->proto;
2568         ma->mode = um->mode;
2569         ma->reqid = um->reqid;
2570
2571         ma->old_family = um->old_family;
2572         ma->new_family = um->new_family;
2573     }
2574
2575     *num = i;
2576     return 0;
2577 }
2578
2579 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2580                struct nlattr **attrs)
2581 {
2582     struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2583     struct xfrm_migrate m[XFRM_MAX_DEPTH];
2584     struct xfrm_kmaddress km, *kmp;
2585     u8 type;
2586     int err;
2587     int n = 0;
2588     struct net *net = sock_net(skb->sk);
2589     struct xfrm_encap_tmpl  *encap = NULL;
2590     u32 if_id = 0;
2591
2592     if (attrs[XFRMA_MIGRATE] == NULL)
2593         return -EINVAL;
2594
2595     kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2596
2597     err = copy_from_user_policy_type(&type, attrs);
2598     if (err)
2599         return err;
2600
2601     err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2602     if (err)
2603         return err;
2604
2605     if (!n)
2606         return 0;
2607
2608     if (attrs[XFRMA_ENCAP]) {
2609         encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2610                 sizeof(*encap), GFP_KERNEL);
2611         if (!encap)
2612             return -ENOMEM;
2613     }
2614
2615     if (attrs[XFRMA_IF_ID])
2616         if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2617
2618     err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap, if_id);
2619
2620     kfree(encap);
2621
2622     return err;
2623 }
2624 #else
2625 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2626                struct nlattr **attrs)
2627 {
2628     return -ENOPROTOOPT;
2629 }
2630 #endif
2631
2632 #ifdef CONFIG_XFRM_MIGRATE
2633 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2634 {
2635     struct xfrm_user_migrate um;
2636
2637     memset(&um, 0, sizeof(um));
2638     um.proto = m->proto;
2639     um.mode = m->mode;
2640     um.reqid = m->reqid;
2641     um.old_family = m->old_family;
2642     memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2643     memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2644     um.new_family = m->new_family;
2645     memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2646     memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2647
2648     return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2649 }
2650
2651 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2652 {
2653     struct xfrm_user_kmaddress uk;
2654
2655     memset(&uk, 0, sizeof(uk));
2656     uk.family = k->family;
2657     uk.reserved = k->reserved;
2658     memcpy(&uk.local, &k->local, sizeof(uk.local));
2659     memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2660
2661     return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2662 }
2663
2664 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2665                         int with_encp)
2666 {
2667     return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2668           + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2669           + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2670           + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2671           + userpolicy_type_attrsize();
2672 }
2673
2674 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2675              int num_migrate, const struct xfrm_kmaddress *k,
2676              const struct xfrm_selector *sel,
2677              const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2678 {
2679     const struct xfrm_migrate *mp;
2680     struct xfrm_userpolicy_id *pol_id;
2681     struct nlmsghdr *nlh;
2682     int i, err;
2683
2684     nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2685     if (nlh == NULL)
2686         return -EMSGSIZE;
2687
2688     pol_id = nlmsg_data(nlh);
2689     /* copy data from selector, dir, and type to the pol_id */
2690     memset(pol_id, 0, sizeof(*pol_id));
2691     memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2692     pol_id->dir = dir;
2693
2694     if (k != NULL) {
2695         err = copy_to_user_kmaddress(k, skb);
2696         if (err)
2697             goto out_cancel;
2698     }
2699     if (encap) {
2700         err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2701         if (err)
2702             goto out_cancel;
2703     }
2704     err = copy_to_user_policy_type(type, skb);
2705     if (err)
2706         goto out_cancel;
2707     for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2708         err = copy_to_user_migrate(mp, skb);
2709         if (err)
2710             goto out_cancel;
2711     }
2712
2713     nlmsg_end(skb, nlh);
2714     return 0;
2715
2716 out_cancel:
2717     nlmsg_cancel(skb, nlh);
2718     return err;
2719 }
2720
2721 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2722                  const struct xfrm_migrate *m, int num_migrate,
2723                  const struct xfrm_kmaddress *k,
2724                  const struct xfrm_encap_tmpl *encap)
2725 {
2726     struct net *net = &init_net;
2727     struct sk_buff *skb;
2728     int err;
2729
2730     skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2731             GFP_ATOMIC);
2732     if (skb == NULL)
2733         return -ENOMEM;
2734
2735     /* build migrate */
2736     err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2737     BUG_ON(err < 0);
2738
2739     return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2740 }
2741 #else
2742 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2743                  const struct xfrm_migrate *m, int num_migrate,
2744                  const struct xfrm_kmaddress *k,
2745                  const struct xfrm_encap_tmpl *encap)
2746 {
2747     return -ENOPROTOOPT;
2748 }
2749 #endif
2750
2751 #define XMSGSIZE(type) sizeof(struct type)
2752
2753 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2754     [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2755     [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2756     [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2757     [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2758     [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2759     [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2760     [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2761     [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2762     [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2763     [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2764     [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2765     [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2766     [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2767     [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2768     [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2769     [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2770     [XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2771     [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2772     [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2773     [XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2774     [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2775     [XFRM_MSG_SETDEFAULT  - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
2776     [XFRM_MSG_GETDEFAULT  - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
2777 };
2778 EXPORT_SYMBOL_GPL(xfrm_msg_min);
2779
2780 #undef XMSGSIZE
2781
2782 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2783     [XFRMA_SA]      = { .len = sizeof(struct xfrm_usersa_info)},
2784     [XFRMA_POLICY]      = { .len = sizeof(struct xfrm_userpolicy_info)},
2785     [XFRMA_LASTUSED]    = { .type = NLA_U64},
2786     [XFRMA_ALG_AUTH_TRUNC]  = { .len = sizeof(struct xfrm_algo_auth)},
2787     [XFRMA_ALG_AEAD]    = { .len = sizeof(struct xfrm_algo_aead) },
2788     [XFRMA_ALG_AUTH]    = { .len = sizeof(struct xfrm_algo) },
2789     [XFRMA_ALG_CRYPT]   = { .len = sizeof(struct xfrm_algo) },
2790     [XFRMA_ALG_COMP]    = { .len = sizeof(struct xfrm_algo) },
2791     [XFRMA_ENCAP]       = { .len = sizeof(struct xfrm_encap_tmpl) },
2792     [XFRMA_TMPL]        = { .len = sizeof(struct xfrm_user_tmpl) },
2793     [XFRMA_SEC_CTX]     = { .len = sizeof(struct xfrm_sec_ctx) },
2794     [XFRMA_LTIME_VAL]   = { .len = sizeof(struct xfrm_lifetime_cur) },
2795     [XFRMA_REPLAY_VAL]  = { .len = sizeof(struct xfrm_replay_state) },
2796     [XFRMA_REPLAY_THRESH]   = { .type = NLA_U32 },
2797     [XFRMA_ETIMER_THRESH]   = { .type = NLA_U32 },
2798     [XFRMA_SRCADDR]     = { .len = sizeof(xfrm_address_t) },
2799     [XFRMA_COADDR]      = { .len = sizeof(xfrm_address_t) },
2800     [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2801     [XFRMA_MIGRATE]     = { .len = sizeof(struct xfrm_user_migrate) },
2802     [XFRMA_KMADDRESS]   = { .len = sizeof(struct xfrm_user_kmaddress) },
2803     [XFRMA_MARK]        = { .len = sizeof(struct xfrm_mark) },
2804     [XFRMA_TFCPAD]      = { .type = NLA_U32 },
2805     [XFRMA_REPLAY_ESN_VAL]  = { .len = sizeof(struct xfrm_replay_state_esn) },
2806     [XFRMA_SA_EXTRA_FLAGS]  = { .type = NLA_U32 },
2807     [XFRMA_PROTO]       = { .type = NLA_U8 },
2808     [XFRMA_ADDRESS_FILTER]  = { .len = sizeof(struct xfrm_address_filter) },
2809     [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2810     [XFRMA_SET_MARK]    = { .type = NLA_U32 },
2811     [XFRMA_SET_MARK_MASK]   = { .type = NLA_U32 },
2812     [XFRMA_IF_ID]       = { .type = NLA_U32 },
2813 };
2814 EXPORT_SYMBOL_GPL(xfrma_policy);
2815
2816 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2817     [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2818     [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2819 };
2820
2821 static const struct xfrm_link {
2822     int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2823     int (*start)(struct netlink_callback *);
2824     int (*dump)(struct sk_buff *, struct netlink_callback *);
2825     int (*done)(struct netlink_callback *);
2826     const struct nla_policy *nla_pol;
2827     int nla_max;
2828 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2829     [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2830     [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2831     [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2832                            .dump = xfrm_dump_sa,
2833                            .done = xfrm_dump_sa_done  },
2834     [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2835     [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2836     [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2837                            .start = xfrm_dump_policy_start,
2838                            .dump = xfrm_dump_policy,
2839                            .done = xfrm_dump_policy_done },
2840     [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2841     [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2842     [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2843     [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2844     [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2845     [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2846     [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2847     [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2848     [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2849     [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2850     [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2851     [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2852     [XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2853                            .nla_pol = xfrma_spd_policy,
2854                            .nla_max = XFRMA_SPD_MAX },
2855     [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2856     [XFRM_MSG_SETDEFAULT  - XFRM_MSG_BASE] = { .doit = xfrm_set_default   },
2857     [XFRM_MSG_GETDEFAULT  - XFRM_MSG_BASE] = { .doit = xfrm_get_default   },
2858 };
2859
2860 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2861                  struct netlink_ext_ack *extack)
2862 {
2863     struct net *net = sock_net(skb->sk);
2864     struct nlattr *attrs[XFRMA_MAX+1];
2865     const struct xfrm_link *link;
2866     struct nlmsghdr *nlh64 = NULL;
2867     int type, err;
2868
2869     type = nlh->nlmsg_type;
2870     if (type > XFRM_MSG_MAX)
2871         return -EINVAL;
2872
2873     type -= XFRM_MSG_BASE;
2874     link = &xfrm_dispatch[type];
2875
2876     /* All operations require privileges, even GET */
2877     if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2878         return -EPERM;
2879
2880     if (in_compat_syscall()) {
2881         struct xfrm_translator *xtr = xfrm_get_translator();
2882
2883         if (!xtr)
2884             return -EOPNOTSUPP;
2885
2886         nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
2887                         link->nla_pol, extack);
2888         xfrm_put_translator(xtr);
2889         if (IS_ERR(nlh64))
2890             return PTR_ERR(nlh64);
2891         if (nlh64)
2892             nlh = nlh64;
2893     }
2894
2895     if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2896          type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2897         (nlh->nlmsg_flags & NLM_F_DUMP)) {
2898         struct netlink_dump_control c = {
2899             .start = link->start,
2900             .dump = link->dump,
2901             .done = link->done,
2902         };
2903
2904         if (link->dump == NULL) {
2905             err = -EINVAL;
2906             goto err;
2907         }
2908
2909         err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2910         goto err;
2911     }
2912
2913     err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2914                      link->nla_max ? : XFRMA_MAX,
2915                      link->nla_pol ? : xfrma_policy, extack);
2916     if (err < 0)
2917         goto err;
2918
2919     if (link->doit == NULL) {
2920         err = -EINVAL;
2921         goto err;
2922     }
2923
2924     err = link->doit(skb, nlh, attrs);
2925
2926     /* We need to free skb allocated in xfrm_alloc_compat() before
2927      * returning from this function, because consume_skb() won't take
2928      * care of frag_list since netlink destructor sets
2929      * sbk->head to NULL. (see netlink_skb_destructor())
2930      */
2931     if (skb_has_frag_list(skb)) {
2932         kfree_skb(skb_shinfo(skb)->frag_list);
2933         skb_shinfo(skb)->frag_list = NULL;
2934     }
2935
2936 err:
2937     kvfree(nlh64);
2938     return err;
2939 }
2940
2941 static void xfrm_netlink_rcv(struct sk_buff *skb)
2942 {
2943     struct net *net = sock_net(skb->sk);
2944
2945     mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2946     netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2947     mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2948 }
2949
2950 static inline unsigned int xfrm_expire_msgsize(void)
2951 {
2952     return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2953            + nla_total_size(sizeof(struct xfrm_mark));
2954 }
2955
2956 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2957 {
2958     struct xfrm_user_expire *ue;
2959     struct nlmsghdr *nlh;
2960     int err;
2961
2962     nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2963     if (nlh == NULL)
2964         return -EMSGSIZE;
2965
2966     ue = nlmsg_data(nlh);
2967     copy_to_user_state(x, &ue->state);
2968     ue->hard = (c->data.hard != 0) ? 1 : 0;
2969     /* clear the padding bytes */
2970     memset_after(ue, 0, hard);
2971
2972     err = xfrm_mark_put(skb, &x->mark);
2973     if (err)
2974         return err;
2975
2976     err = xfrm_if_id_put(skb, x->if_id);
2977     if (err)
2978         return err;
2979
2980     nlmsg_end(skb, nlh);
2981     return 0;
2982 }
2983
2984 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2985 {
2986     struct net *net = xs_net(x);
2987     struct sk_buff *skb;
2988
2989     skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2990     if (skb == NULL)
2991         return -ENOMEM;
2992
2993     if (build_expire(skb, x, c) < 0) {
2994         kfree_skb(skb);
2995         return -EMSGSIZE;
2996     }
2997
2998     return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2999 }
3000
3001 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
3002 {
3003     struct net *net = xs_net(x);
3004     struct sk_buff *skb;
3005     int err;
3006
3007     skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
3008     if (skb == NULL)
3009         return -ENOMEM;
3010
3011     err = build_aevent(skb, x, c);
3012     BUG_ON(err < 0);
3013
3014     return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
3015 }
3016
3017 static int xfrm_notify_sa_flush(const struct km_event *c)
3018 {
3019     struct net *net = c->net;
3020     struct xfrm_usersa_flush *p;
3021     struct nlmsghdr *nlh;
3022     struct sk_buff *skb;
3023     int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
3024
3025     skb = nlmsg_new(len, GFP_ATOMIC);
3026     if (skb == NULL)
3027         return -ENOMEM;
3028
3029     nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
3030     if (nlh == NULL) {
3031         kfree_skb(skb);
3032         return -EMSGSIZE;
3033     }
3034
3035     p = nlmsg_data(nlh);
3036     p->proto = c->data.proto;
3037
3038     nlmsg_end(skb, nlh);
3039
3040     return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3041 }
3042
3043 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
3044 {
3045     unsigned int l = 0;
3046     if (x->aead)
3047         l += nla_total_size(aead_len(x->aead));
3048     if (x->aalg) {
3049         l += nla_total_size(sizeof(struct xfrm_algo) +
3050                     (x->aalg->alg_key_len + 7) / 8);
3051         l += nla_total_size(xfrm_alg_auth_len(x->aalg));
3052     }
3053     if (x->ealg)
3054         l += nla_total_size(xfrm_alg_len(x->ealg));
3055     if (x->calg)
3056         l += nla_total_size(sizeof(*x->calg));
3057     if (x->encap)
3058         l += nla_total_size(sizeof(*x->encap));
3059     if (x->tfcpad)
3060         l += nla_total_size(sizeof(x->tfcpad));
3061     if (x->replay_esn)
3062         l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
3063     else
3064         l += nla_total_size(sizeof(struct xfrm_replay_state));
3065     if (x->security)
3066         l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
3067                     x->security->ctx_len);
3068     if (x->coaddr)
3069         l += nla_total_size(sizeof(*x->coaddr));
3070     if (x->props.extra_flags)
3071         l += nla_total_size(sizeof(x->props.extra_flags));
3072     if (x->xso.dev)
3073          l += nla_total_size(sizeof(struct xfrm_user_offload));
3074     if (x->props.smark.v | x->props.smark.m) {
3075         l += nla_total_size(sizeof(x->props.smark.v));
3076         l += nla_total_size(sizeof(x->props.smark.m));
3077     }
3078     if (x->if_id)
3079         l += nla_total_size(sizeof(x->if_id));
3080
3081     /* Must count x->lastused as it may become non-zero behind our back. */
3082     l += nla_total_size_64bit(sizeof(u64));
3083
3084     if (x->mapping_maxage)
3085         l += nla_total_size(sizeof(x->mapping_maxage));
3086
3087     return l;
3088 }
3089
3090 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
3091 {
3092     struct net *net = xs_net(x);
3093     struct xfrm_usersa_info *p;
3094     struct xfrm_usersa_id *id;
3095     struct nlmsghdr *nlh;
3096     struct sk_buff *skb;
3097     unsigned int len = xfrm_sa_len(x);
3098     unsigned int headlen;
3099     int err;
3100
3101     headlen = sizeof(*p);
3102     if (c->event == XFRM_MSG_DELSA) {
3103         len += nla_total_size(headlen);
3104         headlen = sizeof(*id);
3105         len += nla_total_size(sizeof(struct xfrm_mark));
3106     }
3107     len += NLMSG_ALIGN(headlen);
3108
3109     skb = nlmsg_new(len, GFP_ATOMIC);
3110     if (skb == NULL)
3111         return -ENOMEM;
3112
3113     nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3114     err = -EMSGSIZE;
3115     if (nlh == NULL)
3116         goto out_free_skb;
3117
3118     p = nlmsg_data(nlh);
3119     if (c->event == XFRM_MSG_DELSA) {
3120         struct nlattr *attr;
3121
3122         id = nlmsg_data(nlh);
3123         memset(id, 0, sizeof(*id));
3124         memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
3125         id->spi = x->id.spi;
3126         id->family = x->props.family;
3127         id->proto = x->id.proto;
3128
3129         attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
3130         err = -EMSGSIZE;
3131         if (attr == NULL)
3132             goto out_free_skb;
3133
3134         p = nla_data(attr);
3135     }
3136     err = copy_to_user_state_extra(x, p, skb);
3137     if (err)
3138         goto out_free_skb;
3139
3140     nlmsg_end(skb, nlh);
3141
3142     return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3143
3144 out_free_skb:
3145     kfree_skb(skb);
3146     return err;
3147 }
3148
3149 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
3150 {
3151
3152     switch (c->event) {
3153     case XFRM_MSG_EXPIRE:
3154         return xfrm_exp_state_notify(x, c);
3155     case XFRM_MSG_NEWAE:
3156         return xfrm_aevent_state_notify(x, c);
3157     case XFRM_MSG_DELSA:
3158     case XFRM_MSG_UPDSA:
3159     case XFRM_MSG_NEWSA:
3160         return xfrm_notify_sa(x, c);
3161     case XFRM_MSG_FLUSHSA:
3162         return xfrm_notify_sa_flush(c);
3163     default:
3164         printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3165                c->event);
3166         break;
3167     }
3168
3169     return 0;
3170
3171 }
3172
3173 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3174                         struct xfrm_policy *xp)
3175 {
3176     return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3177            + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3178            + nla_total_size(sizeof(struct xfrm_mark))
3179            + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3180            + userpolicy_type_attrsize();
3181 }
3182
3183 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3184              struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3185 {
3186     __u32 seq = xfrm_get_acqseq();
3187     struct xfrm_user_acquire *ua;
3188     struct nlmsghdr *nlh;
3189     int err;
3190
3191     nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3192     if (nlh == NULL)
3193         return -EMSGSIZE;
3194
3195     ua = nlmsg_data(nlh);
3196     memcpy(&ua->id, &x->id, sizeof(ua->id));
3197     memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3198     memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3199     copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3200     ua->aalgos = xt->aalgos;
3201     ua->ealgos = xt->ealgos;
3202     ua->calgos = xt->calgos;
3203     ua->seq = x->km.seq = seq;
3204
3205     err = copy_to_user_tmpl(xp, skb);
3206     if (!err)
3207         err = copy_to_user_state_sec_ctx(x, skb);
3208     if (!err)
3209         err = copy_to_user_policy_type(xp->type, skb);
3210     if (!err)
3211         err = xfrm_mark_put(skb, &xp->mark);
3212     if (!err)
3213         err = xfrm_if_id_put(skb, xp->if_id);
3214     if (err) {
3215         nlmsg_cancel(skb, nlh);
3216         return err;
3217     }
3218
3219     nlmsg_end(skb, nlh);
3220     return 0;
3221 }
3222
3223 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3224                  struct xfrm_policy *xp)
3225 {
3226     struct net *net = xs_net(x);
3227     struct sk_buff *skb;
3228     int err;
3229
3230     skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3231     if (skb == NULL)
3232         return -ENOMEM;
3233
3234     err = build_acquire(skb, x, xt, xp);
3235     BUG_ON(err < 0);
3236
3237     return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3238 }
3239
3240 /* User gives us xfrm_user_policy_info followed by an array of 0
3241  * or more templates.
3242  */
3243 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3244                            u8 *data, int len, int *dir)
3245 {
3246     struct net *net = sock_net(sk);
3247     struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3248     struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3249     struct xfrm_policy *xp;
3250     int nr;
3251
3252     switch (sk->sk_family) {
3253     case AF_INET:
3254         if (opt != IP_XFRM_POLICY) {
3255             *dir = -EOPNOTSUPP;
3256             return NULL;
3257         }
3258         break;
3259 #if IS_ENABLED(CONFIG_IPV6)
3260     case AF_INET6:
3261         if (opt != IPV6_XFRM_POLICY) {
3262             *dir = -EOPNOTSUPP;
3263             return NULL;
3264         }
3265         break;
3266 #endif
3267     default:
3268         *dir = -EINVAL;
3269         return NULL;
3270     }
3271
3272     *dir = -EINVAL;
3273
3274     if (len < sizeof(*p) ||
3275         verify_newpolicy_info(p))
3276         return NULL;
3277
3278     nr = ((len - sizeof(*p)) / sizeof(*ut));
3279     if (validate_tmpl(nr, ut, p->sel.family))
3280         return NULL;
3281
3282     if (p->dir > XFRM_POLICY_OUT)
3283         return NULL;
3284
3285     xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3286     if (xp == NULL) {
3287         *dir = -ENOBUFS;
3288         return NULL;
3289     }
3290
3291     copy_from_user_policy(xp, p);
3292     xp->type = XFRM_POLICY_TYPE_MAIN;
3293     copy_templates(xp, ut, nr);
3294
3295     *dir = p->dir;
3296
3297     return xp;
3298 }
3299
3300 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3301 {
3302     return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3303            + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3304            + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3305            + nla_total_size(sizeof(struct xfrm_mark))
3306            + userpolicy_type_attrsize();
3307 }
3308
3309 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3310                int dir, const struct km_event *c)
3311 {
3312     struct xfrm_user_polexpire *upe;
3313     int hard = c->data.hard;
3314     struct nlmsghdr *nlh;
3315     int err;
3316
3317     nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3318     if (nlh == NULL)
3319         return -EMSGSIZE;
3320
3321     upe = nlmsg_data(nlh);
3322     copy_to_user_policy(xp, &upe->pol, dir);
3323     err = copy_to_user_tmpl(xp, skb);
3324     if (!err)
3325         err = copy_to_user_sec_ctx(xp, skb);
3326     if (!err)
3327         err = copy_to_user_policy_type(xp->type, skb);
3328     if (!err)
3329         err = xfrm_mark_put(skb, &xp->mark);
3330     if (!err)
3331         err = xfrm_if_id_put(skb, xp->if_id);
3332     if (err) {
3333         nlmsg_cancel(skb, nlh);
3334         return err;
3335     }
3336     upe->hard = !!hard;
3337
3338     nlmsg_end(skb, nlh);
3339     return 0;
3340 }
3341
3342 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3343 {
3344     struct net *net = xp_net(xp);
3345     struct sk_buff *skb;
3346     int err;
3347
3348     skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3349     if (skb == NULL)
3350         return -ENOMEM;
3351
3352     err = build_polexpire(skb, xp, dir, c);
3353     BUG_ON(err < 0);
3354
3355     return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3356 }
3357
3358 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3359 {
3360     unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3361     struct net *net = xp_net(xp);
3362     struct xfrm_userpolicy_info *p;
3363     struct xfrm_userpolicy_id *id;
3364     struct nlmsghdr *nlh;
3365     struct sk_buff *skb;
3366     unsigned int headlen;
3367     int err;
3368
3369     headlen = sizeof(*p);
3370     if (c->event == XFRM_MSG_DELPOLICY) {
3371         len += nla_total_size(headlen);
3372         headlen = sizeof(*id);
3373     }
3374     len += userpolicy_type_attrsize();
3375     len += nla_total_size(sizeof(struct xfrm_mark));
3376     len += NLMSG_ALIGN(headlen);
3377
3378     skb = nlmsg_new(len, GFP_ATOMIC);
3379     if (skb == NULL)
3380         return -ENOMEM;
3381
3382     nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3383     err = -EMSGSIZE;
3384     if (nlh == NULL)
3385         goto out_free_skb;
3386
3387     p = nlmsg_data(nlh);
3388     if (c->event == XFRM_MSG_DELPOLICY) {
3389         struct nlattr *attr;
3390
3391         id = nlmsg_data(nlh);
3392         memset(id, 0, sizeof(*id));
3393         id->dir = dir;
3394         if (c->data.byid)
3395             id->index = xp->index;
3396         else
3397             memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3398
3399         attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3400         err = -EMSGSIZE;
3401         if (attr == NULL)
3402             goto out_free_skb;
3403
3404         p = nla_data(attr);
3405     }
3406
3407     copy_to_user_policy(xp, p, dir);
3408     err = copy_to_user_tmpl(xp, skb);
3409     if (!err)
3410         err = copy_to_user_policy_type(xp->type, skb);
3411     if (!err)
3412         err = xfrm_mark_put(skb, &xp->mark);
3413     if (!err)
3414         err = xfrm_if_id_put(skb, xp->if_id);
3415     if (err)
3416         goto out_free_skb;
3417
3418     nlmsg_end(skb, nlh);
3419
3420     return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3421
3422 out_free_skb:
3423     kfree_skb(skb);
3424     return err;
3425 }
3426
3427 static int xfrm_notify_policy_flush(const struct km_event *c)
3428 {
3429     struct net *net = c->net;
3430     struct nlmsghdr *nlh;
3431     struct sk_buff *skb;
3432     int err;
3433
3434     skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3435     if (skb == NULL)
3436         return -ENOMEM;
3437
3438     nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3439     err = -EMSGSIZE;
3440     if (nlh == NULL)
3441         goto out_free_skb;
3442     err = copy_to_user_policy_type(c->data.type, skb);
3443     if (err)
3444         goto out_free_skb;
3445
3446     nlmsg_end(skb, nlh);
3447
3448     return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3449
3450 out_free_skb:
3451     kfree_skb(skb);
3452     return err;
3453 }
3454
3455 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3456 {
3457
3458     switch (c->event) {
3459     case XFRM_MSG_NEWPOLICY:
3460     case XFRM_MSG_UPDPOLICY:
3461     case XFRM_MSG_DELPOLICY:
3462         return xfrm_notify_policy(xp, dir, c);
3463     case XFRM_MSG_FLUSHPOLICY:
3464         return xfrm_notify_policy_flush(c);
3465     case XFRM_MSG_POLEXPIRE:
3466         return xfrm_exp_policy_notify(xp, dir, c);
3467     default:
3468         printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3469                c->event);
3470     }
3471
3472     return 0;
3473
3474 }
3475
3476 static inline unsigned int xfrm_report_msgsize(void)
3477 {
3478     return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3479 }
3480
3481 static int build_report(struct sk_buff *skb, u8 proto,
3482             struct xfrm_selector *sel, xfrm_address_t *addr)
3483 {
3484     struct xfrm_user_report *ur;
3485     struct nlmsghdr *nlh;
3486
3487     nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3488     if (nlh == NULL)
3489         return -EMSGSIZE;
3490
3491     ur = nlmsg_data(nlh);
3492     ur->proto = proto;
3493     memcpy(&ur->sel, sel, sizeof(ur->sel));
3494
3495     if (addr) {
3496         int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3497         if (err) {
3498             nlmsg_cancel(skb, nlh);
3499             return err;
3500         }
3501     }
3502     nlmsg_end(skb, nlh);
3503     return 0;
3504 }
3505
3506 static int xfrm_send_report(struct net *net, u8 proto,
3507                 struct xfrm_selector *sel, xfrm_address_t *addr)
3508 {
3509     struct sk_buff *skb;
3510     int err;
3511
3512     skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3513     if (skb == NULL)
3514         return -ENOMEM;
3515
3516     err = build_report(skb, proto, sel, addr);
3517     BUG_ON(err < 0);
3518
3519     return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3520 }
3521
3522 static inline unsigned int xfrm_mapping_msgsize(void)
3523 {
3524     return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3525 }
3526
3527 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3528              xfrm_address_t *new_saddr, __be16 new_sport)
3529 {
3530     struct xfrm_user_mapping *um;
3531     struct nlmsghdr *nlh;
3532
3533     nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3534     if (nlh == NULL)
3535         return -EMSGSIZE;
3536
3537     um = nlmsg_data(nlh);
3538
3539     memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3540     um->id.spi = x->id.spi;
3541     um->id.family = x->props.family;
3542     um->id.proto = x->id.proto;
3543     memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3544     memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3545     um->new_sport = new_sport;
3546     um->old_sport = x->encap->encap_sport;
3547     um->reqid = x->props.reqid;
3548
3549     nlmsg_end(skb, nlh);
3550     return 0;
3551 }
3552
3553 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3554                  __be16 sport)
3555 {
3556     struct net *net = xs_net(x);
3557     struct sk_buff *skb;
3558     int err;
3559
3560     if (x->id.proto != IPPROTO_ESP)
3561         return -EINVAL;
3562
3563     if (!x->encap)
3564         return -EINVAL;
3565
3566     skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3567     if (skb == NULL)
3568         return -ENOMEM;
3569
3570     err = build_mapping(skb, x, ipaddr, sport);
3571     BUG_ON(err < 0);
3572
3573     return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3574 }
3575
3576 static bool xfrm_is_alive(const struct km_event *c)
3577 {
3578     return (bool)xfrm_acquire_is_on(c->net);
3579 }
3580
3581 static struct xfrm_mgr netlink_mgr = {
3582     .notify     = xfrm_send_state_notify,
3583     .acquire    = xfrm_send_acquire,
3584     .compile_policy = xfrm_compile_policy,
3585     .notify_policy  = xfrm_send_policy_notify,
3586     .report     = xfrm_send_report,
3587     .migrate    = xfrm_send_migrate,
3588     .new_mapping    = xfrm_send_mapping,
3589     .is_alive   = xfrm_is_alive,
3590 };
3591
3592 static int __net_init xfrm_user_net_init(struct net *net)
3593 {
3594     struct sock *nlsk;
3595     struct netlink_kernel_cfg cfg = {
3596         .groups = XFRMNLGRP_MAX,
3597         .input  = xfrm_netlink_rcv,
3598     };
3599
3600     nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3601     if (nlsk == NULL)
3602         return -ENOMEM;
3603     net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3604     rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3605     return 0;
3606 }
3607
3608 static void __net_exit xfrm_user_net_pre_exit(struct net *net)
3609 {
3610     RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3611 }
3612
3613 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3614 {
3615     struct net *net;
3616
3617     list_for_each_entry(net, net_exit_list, exit_list)
3618         netlink_kernel_release(net->xfrm.nlsk_stash);
3619 }
3620
3621 static struct pernet_operations xfrm_user_net_ops = {
3622     .init       = xfrm_user_net_init,
3623     .pre_exit   = xfrm_user_net_pre_exit,
3624     .exit_batch = xfrm_user_net_exit,
3625 };
3626
3627 static int __init xfrm_user_init(void)
3628 {
3629     int rv;
3630
3631     printk(KERN_INFO "Initializing XFRM netlink socket\n");
3632
3633     rv = register_pernet_subsys(&xfrm_user_net_ops);
3634     if (rv < 0)
3635         return rv;
3636     xfrm_register_km(&netlink_mgr);
3637     return 0;
3638 }
3639
3640 static void __exit xfrm_user_exit(void)
3641 {
3642     xfrm_unregister_km(&netlink_mgr);
3643     unregister_pernet_subsys(&xfrm_user_net_ops);
3644 }
3645
3646 module_init(xfrm_user_init);
3647 module_exit(xfrm_user_exit);
3648 MODULE_LICENSE("GPL");
3649 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);