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xfrm_user.c

/* xfrm_user.c: User interface to configure xfrm engine.
 *
 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
 *
 * Changes:
 *    Mitsuru KANDA @USAGI
 *    Kazunori MIYAZAWA @USAGI
 *    Kunihiro Ishiguro <kunihiro@ipinfusion.com>
 *          IPv6 support
 *
 */

#include <linux/crypto.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
#include <linux/init.h>
#include <linux/security.h>
#include <net/sock.h>
#include <net/xfrm.h>
#include <net/netlink.h>
#include <asm/uaccess.h>
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
#include <linux/in6.h>
#endif

static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
{
      struct nlattr *rt = attrs[type];
      struct xfrm_algo *algp;

      if (!rt)
            return 0;

      algp = nla_data(rt);
      if (nla_len(rt) < xfrm_alg_len(algp))
            return -EINVAL;

      switch (type) {
      case XFRMA_ALG_AUTH:
            if (!algp->alg_key_len &&
                strcmp(algp->alg_name, "digest_null") != 0)
                  return -EINVAL;
            break;

      case XFRMA_ALG_CRYPT:
            if (!algp->alg_key_len &&
                strcmp(algp->alg_name, "cipher_null") != 0)
                  return -EINVAL;
            break;

      case XFRMA_ALG_COMP:
            /* Zero length keys are legal.  */
            break;

      default:
            return -EINVAL;
      }

      algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
      return 0;
}

static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
                     xfrm_address_t **addrp)
{
      struct nlattr *rt = attrs[type];

      if (rt && addrp)
            *addrp = nla_data(rt);
}

static inline int verify_sec_ctx_len(struct nlattr **attrs)
{
      struct nlattr *rt = attrs[XFRMA_SEC_CTX];
      struct xfrm_user_sec_ctx *uctx;

      if (!rt)
            return 0;

      uctx = nla_data(rt);
      if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
            return -EINVAL;

      return 0;
}


static int verify_newsa_info(struct xfrm_usersa_info *p,
                       struct nlattr **attrs)
{
      int err;

      err = -EINVAL;
      switch (p->family) {
      case AF_INET:
            break;

      case AF_INET6:
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
            break;
#else
            err = -EAFNOSUPPORT;
            goto out;
#endif

      default:
            goto out;
      }

      err = -EINVAL;
      switch (p->id.proto) {
      case IPPROTO_AH:
            if (!attrs[XFRMA_ALG_AUTH]    ||
                attrs[XFRMA_ALG_CRYPT]    ||
                attrs[XFRMA_ALG_COMP])
                  goto out;
            break;

      case IPPROTO_ESP:
            if ((!attrs[XFRMA_ALG_AUTH] &&
                 !attrs[XFRMA_ALG_CRYPT]) ||
                attrs[XFRMA_ALG_COMP])
                  goto out;
            break;

      case IPPROTO_COMP:
            if (!attrs[XFRMA_ALG_COMP]    ||
                attrs[XFRMA_ALG_AUTH]     ||
                attrs[XFRMA_ALG_CRYPT])
                  goto out;
            break;

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
      case IPPROTO_DSTOPTS:
      case IPPROTO_ROUTING:
            if (attrs[XFRMA_ALG_COMP]     ||
                attrs[XFRMA_ALG_AUTH]     ||
                attrs[XFRMA_ALG_CRYPT]    ||
                attrs[XFRMA_ENCAP]        ||
                attrs[XFRMA_SEC_CTX]      ||
                !attrs[XFRMA_COADDR])
                  goto out;
            break;
#endif

      default:
            goto out;
      }

      if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
            goto out;
      if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
            goto out;
      if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
            goto out;
      if ((err = verify_sec_ctx_len(attrs)))
            goto out;

      err = -EINVAL;
      switch (p->mode) {
      case XFRM_MODE_TRANSPORT:
      case XFRM_MODE_TUNNEL:
      case XFRM_MODE_ROUTEOPTIMIZATION:
      case XFRM_MODE_BEET:
            break;

      default:
            goto out;
      }

      err = 0;

out:
      return err;
}

static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
                     struct xfrm_algo_desc *(*get_byname)(char *, int),
                     struct nlattr *rta)
{
      struct xfrm_algo *p, *ualg;
      struct xfrm_algo_desc *algo;

      if (!rta)
            return 0;

      ualg = nla_data(rta);

      algo = get_byname(ualg->alg_name, 1);
      if (!algo)
            return -ENOSYS;
      *props = algo->desc.sadb_alg_id;

      p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
      if (!p)
            return -ENOMEM;

      strcpy(p->alg_name, algo->name);
      *algpp = p;
      return 0;
}

static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
{
      int len = 0;

      if (xfrm_ctx) {
            len += sizeof(struct xfrm_user_sec_ctx);
            len += xfrm_ctx->ctx_len;
      }
      return len;
}

static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
{
      memcpy(&x->id, &p->id, sizeof(x->id));
      memcpy(&x->sel, &p->sel, sizeof(x->sel));
      memcpy(&x->lft, &p->lft, sizeof(x->lft));
      x->props.mode = p->mode;
      x->props.replay_window = p->replay_window;
      x->props.reqid = p->reqid;
      x->props.family = p->family;
      memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
      x->props.flags = p->flags;

      /*
       * Set inner address family if the KM left it as zero.
       * See comment in validate_tmpl.
       */
      if (!x->sel.family)
            x->sel.family = p->family;
}

/*
 * someday when pfkey also has support, we could have the code
 * somehow made shareable and move it to xfrm_state.c - JHS
 *
*/
static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
{
      struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
      struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
      struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
      struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];

      if (rp) {
            struct xfrm_replay_state *replay;
            replay = nla_data(rp);
            memcpy(&x->replay, replay, sizeof(*replay));
            memcpy(&x->preplay, replay, sizeof(*replay));
      }

      if (lt) {
            struct xfrm_lifetime_cur *ltime;
            ltime = nla_data(lt);
            x->curlft.bytes = ltime->bytes;
            x->curlft.packets = ltime->packets;
            x->curlft.add_time = ltime->add_time;
            x->curlft.use_time = ltime->use_time;
      }

      if (et)
            x->replay_maxage = nla_get_u32(et);

      if (rt)
            x->replay_maxdiff = nla_get_u32(rt);
}

static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
                                     struct nlattr **attrs,
                                     int *errp)
{
      struct xfrm_state *x = xfrm_state_alloc();
      int err = -ENOMEM;

      if (!x)
            goto error_no_put;

      copy_from_user_state(x, p);

      if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
                           xfrm_aalg_get_byname,
                           attrs[XFRMA_ALG_AUTH])))
            goto error;
      if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
                           xfrm_ealg_get_byname,
                           attrs[XFRMA_ALG_CRYPT])))
            goto error;
      if ((err = attach_one_algo(&x->calg, &x->props.calgo,
                           xfrm_calg_get_byname,
                           attrs[XFRMA_ALG_COMP])))
            goto error;

      if (attrs[XFRMA_ENCAP]) {
            x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
                           sizeof(*x->encap), GFP_KERNEL);
            if (x->encap == NULL)
                  goto error;
      }

      if (attrs[XFRMA_COADDR]) {
            x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
                            sizeof(*x->coaddr), GFP_KERNEL);
            if (x->coaddr == NULL)
                  goto error;
      }

      err = xfrm_init_state(x);
      if (err)
            goto error;

      if (attrs[XFRMA_SEC_CTX] &&
          security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
            goto error;

      x->km.seq = p->seq;
      x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
      /* sysctl_xfrm_aevent_etime is in 100ms units */
      x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
      x->preplay.bitmap = 0;
      x->preplay.seq = x->replay.seq+x->replay_maxdiff;
      x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;

      /* override default values from above */

      xfrm_update_ae_params(x, attrs);

      return x;

error:
      x->km.state = XFRM_STATE_DEAD;
      xfrm_state_put(x);
error_no_put:
      *errp = err;
      return NULL;
}

static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct xfrm_usersa_info *p = nlmsg_data(nlh);
      struct xfrm_state *x;
      int err;
      struct km_event c;

      err = verify_newsa_info(p, attrs);
      if (err)
            return err;

      x = xfrm_state_construct(p, attrs, &err);
      if (!x)
            return err;

      xfrm_state_hold(x);
      if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
            err = xfrm_state_add(x);
      else
            err = xfrm_state_update(x);

      xfrm_audit_state_add(x, err ? 0 : 1, NETLINK_CB(skb).loginuid,
                       NETLINK_CB(skb).sid);

      if (err < 0) {
            x->km.state = XFRM_STATE_DEAD;
            __xfrm_state_put(x);
            goto out;
      }

      c.seq = nlh->nlmsg_seq;
      c.pid = nlh->nlmsg_pid;
      c.event = nlh->nlmsg_type;

      km_state_notify(x, &c);
out:
      xfrm_state_put(x);
      return err;
}

static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
                                     struct nlattr **attrs,
                                     int *errp)
{
      struct xfrm_state *x = NULL;
      int err;

      if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
            err = -ESRCH;
            x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
      } else {
            xfrm_address_t *saddr = NULL;

            verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
            if (!saddr) {
                  err = -EINVAL;
                  goto out;
            }

            err = -ESRCH;
            x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
                                   p->family);
      }

 out:
      if (!x && errp)
            *errp = err;
      return x;
}

static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct xfrm_state *x;
      int err = -ESRCH;
      struct km_event c;
      struct xfrm_usersa_id *p = nlmsg_data(nlh);

      x = xfrm_user_state_lookup(p, attrs, &err);
      if (x == NULL)
            return err;

      if ((err = security_xfrm_state_delete(x)) != 0)
            goto out;

      if (xfrm_state_kern(x)) {
            err = -EPERM;
            goto out;
      }

      err = xfrm_state_delete(x);

      if (err < 0)
            goto out;

      c.seq = nlh->nlmsg_seq;
      c.pid = nlh->nlmsg_pid;
      c.event = nlh->nlmsg_type;
      km_state_notify(x, &c);

out:
      xfrm_audit_state_delete(x, err ? 0 : 1, NETLINK_CB(skb).loginuid,
                        NETLINK_CB(skb).sid);
      xfrm_state_put(x);
      return err;
}

static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
{
      memcpy(&p->id, &x->id, sizeof(p->id));
      memcpy(&p->sel, &x->sel, sizeof(p->sel));
      memcpy(&p->lft, &x->lft, sizeof(p->lft));
      memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
      memcpy(&p->stats, &x->stats, sizeof(p->stats));
      memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
      p->mode = x->props.mode;
      p->replay_window = x->props.replay_window;
      p->reqid = x->props.reqid;
      p->family = x->props.family;
      p->flags = x->props.flags;
      p->seq = x->km.seq;
}

struct xfrm_dump_info {
      struct sk_buff *in_skb;
      struct sk_buff *out_skb;
      u32 nlmsg_seq;
      u16 nlmsg_flags;
      int start_idx;
      int this_idx;
};

static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
{
      struct xfrm_user_sec_ctx *uctx;
      struct nlattr *attr;
      int ctx_size = sizeof(*uctx) + s->ctx_len;

      attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
      if (attr == NULL)
            return -EMSGSIZE;

      uctx = nla_data(attr);
      uctx->exttype = XFRMA_SEC_CTX;
      uctx->len = ctx_size;
      uctx->ctx_doi = s->ctx_doi;
      uctx->ctx_alg = s->ctx_alg;
      uctx->ctx_len = s->ctx_len;
      memcpy(uctx + 1, s->ctx_str, s->ctx_len);

      return 0;
}

/* Don't change this without updating xfrm_sa_len! */
static int copy_to_user_state_extra(struct xfrm_state *x,
                            struct xfrm_usersa_info *p,
                            struct sk_buff *skb)
{
      copy_to_user_state(x, p);

      if (x->coaddr)
            NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);

      if (x->lastused)
            NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);

      if (x->aalg)
            NLA_PUT(skb, XFRMA_ALG_AUTH, xfrm_alg_len(x->aalg), x->aalg);
      if (x->ealg)
            NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
      if (x->calg)
            NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);

      if (x->encap)
            NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);

      if (x->security && copy_sec_ctx(x->security, skb) < 0)
            goto nla_put_failure;

      return 0;

nla_put_failure:
      return -EMSGSIZE;
}

static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
{
      struct xfrm_dump_info *sp = ptr;
      struct sk_buff *in_skb = sp->in_skb;
      struct sk_buff *skb = sp->out_skb;
      struct xfrm_usersa_info *p;
      struct nlmsghdr *nlh;
      int err;

      if (sp->this_idx < sp->start_idx)
            goto out;

      nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
                  XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
      if (nlh == NULL)
            return -EMSGSIZE;

      p = nlmsg_data(nlh);

      err = copy_to_user_state_extra(x, p, skb);
      if (err)
            goto nla_put_failure;

      nlmsg_end(skb, nlh);
out:
      sp->this_idx++;
      return 0;

nla_put_failure:
      nlmsg_cancel(skb, nlh);
      return err;
}

static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
{
      struct xfrm_dump_info info;

      info.in_skb = cb->skb;
      info.out_skb = skb;
      info.nlmsg_seq = cb->nlh->nlmsg_seq;
      info.nlmsg_flags = NLM_F_MULTI;
      info.this_idx = 0;
      info.start_idx = cb->args[0];
      (void) xfrm_state_walk(0, dump_one_state, &info);
      cb->args[0] = info.this_idx;

      return skb->len;
}

static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
                                struct xfrm_state *x, u32 seq)
{
      struct xfrm_dump_info info;
      struct sk_buff *skb;

      skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
      if (!skb)
            return ERR_PTR(-ENOMEM);

      info.in_skb = in_skb;
      info.out_skb = skb;
      info.nlmsg_seq = seq;
      info.nlmsg_flags = 0;
      info.this_idx = info.start_idx = 0;

      if (dump_one_state(x, 0, &info)) {
            kfree_skb(skb);
            return NULL;
      }

      return skb;
}

static inline size_t xfrm_spdinfo_msgsize(void)
{
      return NLMSG_ALIGN(4)
             + nla_total_size(sizeof(struct xfrmu_spdinfo))
             + nla_total_size(sizeof(struct xfrmu_spdhinfo));
}

static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
{
      struct xfrmk_spdinfo si;
      struct xfrmu_spdinfo spc;
      struct xfrmu_spdhinfo sph;
      struct nlmsghdr *nlh;
      u32 *f;

      nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
      if (nlh == NULL) /* shouldnt really happen ... */
            return -EMSGSIZE;

      f = nlmsg_data(nlh);
      *f = flags;
      xfrm_spd_getinfo(&si);
      spc.incnt = si.incnt;
      spc.outcnt = si.outcnt;
      spc.fwdcnt = si.fwdcnt;
      spc.inscnt = si.inscnt;
      spc.outscnt = si.outscnt;
      spc.fwdscnt = si.fwdscnt;
      sph.spdhcnt = si.spdhcnt;
      sph.spdhmcnt = si.spdhmcnt;

      NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
      NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);

      return nlmsg_end(skb, nlh);

nla_put_failure:
      nlmsg_cancel(skb, nlh);
      return -EMSGSIZE;
}

static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct sk_buff *r_skb;
      u32 *flags = nlmsg_data(nlh);
      u32 spid = NETLINK_CB(skb).pid;
      u32 seq = nlh->nlmsg_seq;

      r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
      if (r_skb == NULL)
            return -ENOMEM;

      if (build_spdinfo(r_skb, spid, seq, *flags) < 0)
            BUG();

      return nlmsg_unicast(xfrm_nl, r_skb, spid);
}

static inline size_t xfrm_sadinfo_msgsize(void)
{
      return NLMSG_ALIGN(4)
             + nla_total_size(sizeof(struct xfrmu_sadhinfo))
             + nla_total_size(4); /* XFRMA_SAD_CNT */
}

static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
{
      struct xfrmk_sadinfo si;
      struct xfrmu_sadhinfo sh;
      struct nlmsghdr *nlh;
      u32 *f;

      nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
      if (nlh == NULL) /* shouldnt really happen ... */
            return -EMSGSIZE;

      f = nlmsg_data(nlh);
      *f = flags;
      xfrm_sad_getinfo(&si);

      sh.sadhmcnt = si.sadhmcnt;
      sh.sadhcnt = si.sadhcnt;

      NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
      NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);

      return nlmsg_end(skb, nlh);

nla_put_failure:
      nlmsg_cancel(skb, nlh);
      return -EMSGSIZE;
}

static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct sk_buff *r_skb;
      u32 *flags = nlmsg_data(nlh);
      u32 spid = NETLINK_CB(skb).pid;
      u32 seq = nlh->nlmsg_seq;

      r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
      if (r_skb == NULL)
            return -ENOMEM;

      if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
            BUG();

      return nlmsg_unicast(xfrm_nl, r_skb, spid);
}

static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct xfrm_usersa_id *p = nlmsg_data(nlh);
      struct xfrm_state *x;
      struct sk_buff *resp_skb;
      int err = -ESRCH;

      x = xfrm_user_state_lookup(p, attrs, &err);
      if (x == NULL)
            goto out_noput;

      resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
      if (IS_ERR(resp_skb)) {
            err = PTR_ERR(resp_skb);
      } else {
            err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
      }
      xfrm_state_put(x);
out_noput:
      return err;
}

static int verify_userspi_info(struct xfrm_userspi_info *p)
{
      switch (p->info.id.proto) {
      case IPPROTO_AH:
      case IPPROTO_ESP:
            break;

      case IPPROTO_COMP:
            /* IPCOMP spi is 16-bits. */
            if (p->max >= 0x10000)
                  return -EINVAL;
            break;

      default:
            return -EINVAL;
      }

      if (p->min > p->max)
            return -EINVAL;

      return 0;
}

static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct xfrm_state *x;
      struct xfrm_userspi_info *p;
      struct sk_buff *resp_skb;
      xfrm_address_t *daddr;
      int family;
      int err;

      p = nlmsg_data(nlh);
      err = verify_userspi_info(p);
      if (err)
            goto out_noput;

      family = p->info.family;
      daddr = &p->info.id.daddr;

      x = NULL;
      if (p->info.seq) {
            x = xfrm_find_acq_byseq(p->info.seq);
            if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
                  xfrm_state_put(x);
                  x = NULL;
            }
      }

      if (!x)
            x = xfrm_find_acq(p->info.mode, p->info.reqid,
                          p->info.id.proto, daddr,
                          &p->info.saddr, 1,
                          family);
      err = -ENOENT;
      if (x == NULL)
            goto out_noput;

      err = xfrm_alloc_spi(x, p->min, p->max);
      if (err)
            goto out;

      resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
      if (IS_ERR(resp_skb)) {
            err = PTR_ERR(resp_skb);
            goto out;
      }

      err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);

out:
      xfrm_state_put(x);
out_noput:
      return err;
}

static int verify_policy_dir(u8 dir)
{
      switch (dir) {
      case XFRM_POLICY_IN:
      case XFRM_POLICY_OUT:
      case XFRM_POLICY_FWD:
            break;

      default:
            return -EINVAL;
      }

      return 0;
}

static int verify_policy_type(u8 type)
{
      switch (type) {
      case XFRM_POLICY_TYPE_MAIN:
#ifdef CONFIG_XFRM_SUB_POLICY
      case XFRM_POLICY_TYPE_SUB:
#endif
            break;

      default:
            return -EINVAL;
      }

      return 0;
}

static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
{
      switch (p->share) {
      case XFRM_SHARE_ANY:
      case XFRM_SHARE_SESSION:
      case XFRM_SHARE_USER:
      case XFRM_SHARE_UNIQUE:
            break;

      default:
            return -EINVAL;
      }

      switch (p->action) {
      case XFRM_POLICY_ALLOW:
      case XFRM_POLICY_BLOCK:
            break;

      default:
            return -EINVAL;
      }

      switch (p->sel.family) {
      case AF_INET:
            break;

      case AF_INET6:
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
            break;
#else
            return  -EAFNOSUPPORT;
#endif

      default:
            return -EINVAL;
      }

      return verify_policy_dir(p->dir);
}

static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
{
      struct nlattr *rt = attrs[XFRMA_SEC_CTX];
      struct xfrm_user_sec_ctx *uctx;

      if (!rt)
            return 0;

      uctx = nla_data(rt);
      return security_xfrm_policy_alloc(pol, uctx);
}

static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
                     int nr)
{
      int i;

      xp->xfrm_nr = nr;
      for (i = 0; i < nr; i++, ut++) {
            struct xfrm_tmpl *t = &xp->xfrm_vec[i];

            memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
            memcpy(&t->saddr, &ut->saddr,
                   sizeof(xfrm_address_t));
            t->reqid = ut->reqid;
            t->mode = ut->mode;
            t->share = ut->share;
            t->optional = ut->optional;
            t->aalgos = ut->aalgos;
            t->ealgos = ut->ealgos;
            t->calgos = ut->calgos;
            t->encap_family = ut->family;
      }
}

static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
{
      int i;

      if (nr > XFRM_MAX_DEPTH)
            return -EINVAL;

      for (i = 0; i < nr; i++) {
            /* We never validated the ut->family value, so many
             * applications simply leave it at zero.  The check was
             * never made and ut->family was ignored because all
             * templates could be assumed to have the same family as
             * the policy itself.  Now that we will have ipv4-in-ipv6
             * and ipv6-in-ipv4 tunnels, this is no longer true.
             */
            if (!ut[i].family)
                  ut[i].family = family;

            switch (ut[i].family) {
            case AF_INET:
                  break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
            case AF_INET6:
                  break;
#endif
            default:
                  return -EINVAL;
            }
      }

      return 0;
}

static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
{
      struct nlattr *rt = attrs[XFRMA_TMPL];

      if (!rt) {
            pol->xfrm_nr = 0;
      } else {
            struct xfrm_user_tmpl *utmpl = nla_data(rt);
            int nr = nla_len(rt) / sizeof(*utmpl);
            int err;

            err = validate_tmpl(nr, utmpl, pol->family);
            if (err)
                  return err;

            copy_templates(pol, utmpl, nr);
      }
      return 0;
}

static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
{
      struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
      struct xfrm_userpolicy_type *upt;
      u8 type = XFRM_POLICY_TYPE_MAIN;
      int err;

      if (rt) {
            upt = nla_data(rt);
            type = upt->type;
      }

      err = verify_policy_type(type);
      if (err)
            return err;

      *tp = type;
      return 0;
}

static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
{
      xp->priority = p->priority;
      xp->index = p->index;
      memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
      memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
      xp->action = p->action;
      xp->flags = p->flags;
      xp->family = p->sel.family;
      /* XXX xp->share = p->share; */
}

static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
{
      memcpy(&p->sel, &xp->selector, sizeof(p->sel));
      memcpy(&p->lft, &xp->lft, sizeof(p->lft));
      memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
      p->priority = xp->priority;
      p->index = xp->index;
      p->sel.family = xp->family;
      p->dir = dir;
      p->action = xp->action;
      p->flags = xp->flags;
      p->share = XFRM_SHARE_ANY; /* XXX xp->share */
}

static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
{
      struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
      int err;

      if (!xp) {
            *errp = -ENOMEM;
            return NULL;
      }

      copy_from_user_policy(xp, p);

      err = copy_from_user_policy_type(&xp->type, attrs);
      if (err)
            goto error;

      if (!(err = copy_from_user_tmpl(xp, attrs)))
            err = copy_from_user_sec_ctx(xp, attrs);
      if (err)
            goto error;

      return xp;
 error:
      *errp = err;
      kfree(xp);
      return NULL;
}

static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
      struct xfrm_policy *xp;
      struct km_event c;
      int err;
      int excl;

      err = verify_newpolicy_info(p);
      if (err)
            return err;
      err = verify_sec_ctx_len(attrs);
      if (err)
            return err;

      xp = xfrm_policy_construct(p, attrs, &err);
      if (!xp)
            return err;

      /* shouldnt excl be based on nlh flags??
       * Aha! this is anti-netlink really i.e  more pfkey derived
       * in netlink excl is a flag and you wouldnt need
       * a type XFRM_MSG_UPDPOLICY - JHS */
      excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
      err = xfrm_policy_insert(p->dir, xp, excl);
      xfrm_audit_policy_add(xp, err ? 0 : 1, NETLINK_CB(skb).loginuid,
                        NETLINK_CB(skb).sid);

      if (err) {
            security_xfrm_policy_free(xp);
            kfree(xp);
            return err;
      }

      c.event = nlh->nlmsg_type;
      c.seq = nlh->nlmsg_seq;
      c.pid = nlh->nlmsg_pid;
      km_policy_notify(xp, p->dir, &c);

      xfrm_pol_put(xp);

      return 0;
}

static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
{
      struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
      int i;

      if (xp->xfrm_nr == 0)
            return 0;

      for (i = 0; i < xp->xfrm_nr; i++) {
            struct xfrm_user_tmpl *up = &vec[i];
            struct xfrm_tmpl *kp = &xp->xfrm_vec[i];

            memcpy(&up->id, &kp->id, sizeof(up->id));
            up->family = kp->encap_family;
            memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
            up->reqid = kp->reqid;
            up->mode = kp->mode;
            up->share = kp->share;
            up->optional = kp->optional;
            up->aalgos = kp->aalgos;
            up->ealgos = kp->ealgos;
            up->calgos = kp->calgos;
      }

      return nla_put(skb, XFRMA_TMPL,
                   sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
}

static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
{
      if (x->security) {
            return copy_sec_ctx(x->security, skb);
      }
      return 0;
}

static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
{
      if (xp->security) {
            return copy_sec_ctx(xp->security, skb);
      }
      return 0;
}
static inline size_t userpolicy_type_attrsize(void)
{
#ifdef CONFIG_XFRM_SUB_POLICY
      return nla_total_size(sizeof(struct xfrm_userpolicy_type));
#else
      return 0;
#endif
}

#ifdef CONFIG_XFRM_SUB_POLICY
static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
{
      struct xfrm_userpolicy_type upt = {
            .type = type,
      };

      return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
}

#else
static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
{
      return 0;
}
#endif

static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
{
      struct xfrm_dump_info *sp = ptr;
      struct xfrm_userpolicy_info *p;
      struct sk_buff *in_skb = sp->in_skb;
      struct sk_buff *skb = sp->out_skb;
      struct nlmsghdr *nlh;

      if (sp->this_idx < sp->start_idx)
            goto out;

      nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
                  XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
      if (nlh == NULL)
            return -EMSGSIZE;

      p = nlmsg_data(nlh);
      copy_to_user_policy(xp, p, dir);
      if (copy_to_user_tmpl(xp, skb) < 0)
            goto nlmsg_failure;
      if (copy_to_user_sec_ctx(xp, skb))
            goto nlmsg_failure;
      if (copy_to_user_policy_type(xp->type, skb) < 0)
            goto nlmsg_failure;

      nlmsg_end(skb, nlh);
out:
      sp->this_idx++;
      return 0;

nlmsg_failure:
      nlmsg_cancel(skb, nlh);
      return -EMSGSIZE;
}

static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
{
      struct xfrm_dump_info info;

      info.in_skb = cb->skb;
      info.out_skb = skb;
      info.nlmsg_seq = cb->nlh->nlmsg_seq;
      info.nlmsg_flags = NLM_F_MULTI;
      info.this_idx = 0;
      info.start_idx = cb->args[0];
      (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
#ifdef CONFIG_XFRM_SUB_POLICY
      (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
#endif
      cb->args[0] = info.this_idx;

      return skb->len;
}

static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
                                struct xfrm_policy *xp,
                                int dir, u32 seq)
{
      struct xfrm_dump_info info;
      struct sk_buff *skb;

      skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
      if (!skb)
            return ERR_PTR(-ENOMEM);

      info.in_skb = in_skb;
      info.out_skb = skb;
      info.nlmsg_seq = seq;
      info.nlmsg_flags = 0;
      info.this_idx = info.start_idx = 0;

      if (dump_one_policy(xp, dir, 0, &info) < 0) {
            kfree_skb(skb);
            return NULL;
      }

      return skb;
}

static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct xfrm_policy *xp;
      struct xfrm_userpolicy_id *p;
      u8 type = XFRM_POLICY_TYPE_MAIN;
      int err;
      struct km_event c;
      int delete;

      p = nlmsg_data(nlh);
      delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;

      err = copy_from_user_policy_type(&type, attrs);
      if (err)
            return err;

      err = verify_policy_dir(p->dir);
      if (err)
            return err;

      if (p->index)
            xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
      else {
            struct nlattr *rt = attrs[XFRMA_SEC_CTX];
            struct xfrm_policy tmp;

            err = verify_sec_ctx_len(attrs);
            if (err)
                  return err;

            memset(&tmp, 0, sizeof(struct xfrm_policy));
            if (rt) {
                  struct xfrm_user_sec_ctx *uctx = nla_data(rt);

                  if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
                        return err;
            }
            xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
                                 delete, &err);
            security_xfrm_policy_free(&tmp);
      }
      if (xp == NULL)
            return -ENOENT;

      if (!delete) {
            struct sk_buff *resp_skb;

            resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
            if (IS_ERR(resp_skb)) {
                  err = PTR_ERR(resp_skb);
            } else {
                  err = nlmsg_unicast(xfrm_nl, resp_skb,
                                  NETLINK_CB(skb).pid);
            }
      } else {
            xfrm_audit_policy_delete(xp, err ? 0 : 1,
                               NETLINK_CB(skb).loginuid,
                               NETLINK_CB(skb).sid);

            if (err != 0)
                  goto out;

            c.data.byid = p->index;
            c.event = nlh->nlmsg_type;
            c.seq = nlh->nlmsg_seq;
            c.pid = nlh->nlmsg_pid;
            km_policy_notify(xp, p->dir, &c);
      }

out:
      xfrm_pol_put(xp);
      return err;
}

static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct km_event c;
      struct xfrm_usersa_flush *p = nlmsg_data(nlh);
      struct xfrm_audit audit_info;
      int err;

      audit_info.loginuid = NETLINK_CB(skb).loginuid;
      audit_info.secid = NETLINK_CB(skb).sid;
      err = xfrm_state_flush(p->proto, &audit_info);
      if (err)
            return err;
      c.data.proto = p->proto;
      c.event = nlh->nlmsg_type;
      c.seq = nlh->nlmsg_seq;
      c.pid = nlh->nlmsg_pid;
      km_state_notify(NULL, &c);

      return 0;
}

static inline size_t xfrm_aevent_msgsize(void)
{
      return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
             + nla_total_size(sizeof(struct xfrm_replay_state))
             + nla_total_size(sizeof(struct xfrm_lifetime_cur))
             + nla_total_size(4) /* XFRM_AE_RTHR */
             + nla_total_size(4); /* XFRM_AE_ETHR */
}

static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
{
      struct xfrm_aevent_id *id;
      struct nlmsghdr *nlh;

      nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
      if (nlh == NULL)
            return -EMSGSIZE;

      id = nlmsg_data(nlh);
      memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
      id->sa_id.spi = x->id.spi;
      id->sa_id.family = x->props.family;
      id->sa_id.proto = x->id.proto;
      memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
      id->reqid = x->props.reqid;
      id->flags = c->data.aevent;

      NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
      NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);

      if (id->flags & XFRM_AE_RTHR)
            NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);

      if (id->flags & XFRM_AE_ETHR)
            NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
                      x->replay_maxage * 10 / HZ);

      return nlmsg_end(skb, nlh);

nla_put_failure:
      nlmsg_cancel(skb, nlh);
      return -EMSGSIZE;
}

static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct xfrm_state *x;
      struct sk_buff *r_skb;
      int err;
      struct km_event c;
      struct xfrm_aevent_id *p = nlmsg_data(nlh);
      struct xfrm_usersa_id *id = &p->sa_id;

      r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
      if (r_skb == NULL)
            return -ENOMEM;

      x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
      if (x == NULL) {
            kfree_skb(r_skb);
            return -ESRCH;
      }

      /*
       * XXX: is this lock really needed - none of the other
       * gets lock (the concern is things getting updated
       * while we are still reading) - jhs
      */
      spin_lock_bh(&x->lock);
      c.data.aevent = p->flags;
      c.seq = nlh->nlmsg_seq;
      c.pid = nlh->nlmsg_pid;

      if (build_aevent(r_skb, x, &c) < 0)
            BUG();
      err = nlmsg_unicast(xfrm_nl, r_skb, NETLINK_CB(skb).pid);
      spin_unlock_bh(&x->lock);
      xfrm_state_put(x);
      return err;
}

static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct xfrm_state *x;
      struct km_event c;
      int err = - EINVAL;
      struct xfrm_aevent_id *p = nlmsg_data(nlh);
      struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
      struct nlattr *lt = attrs[XFRMA_LTIME_VAL];

      if (!lt && !rp)
            return err;

      /* pedantic mode - thou shalt sayeth replaceth */
      if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
            return err;

      x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
      if (x == NULL)
            return -ESRCH;

      if (x->km.state != XFRM_STATE_VALID)
            goto out;

      spin_lock_bh(&x->lock);
      xfrm_update_ae_params(x, attrs);
      spin_unlock_bh(&x->lock);

      c.event = nlh->nlmsg_type;
      c.seq = nlh->nlmsg_seq;
      c.pid = nlh->nlmsg_pid;
      c.data.aevent = XFRM_AE_CU;
      km_state_notify(x, &c);
      err = 0;
out:
      xfrm_state_put(x);
      return err;
}

static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct km_event c;
      u8 type = XFRM_POLICY_TYPE_MAIN;
      int err;
      struct xfrm_audit audit_info;

      err = copy_from_user_policy_type(&type, attrs);
      if (err)
            return err;

      audit_info.loginuid = NETLINK_CB(skb).loginuid;
      audit_info.secid = NETLINK_CB(skb).sid;
      err = xfrm_policy_flush(type, &audit_info);
      if (err)
            return err;
      c.data.type = type;
      c.event = nlh->nlmsg_type;
      c.seq = nlh->nlmsg_seq;
      c.pid = nlh->nlmsg_pid;
      km_policy_notify(NULL, 0, &c);
      return 0;
}

static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct xfrm_policy *xp;
      struct xfrm_user_polexpire *up = nlmsg_data(nlh);
      struct xfrm_userpolicy_info *p = &up->pol;
      u8 type = XFRM_POLICY_TYPE_MAIN;
      int err = -ENOENT;

      err = copy_from_user_policy_type(&type, attrs);
      if (err)
            return err;

      if (p->index)
            xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
      else {
            struct nlattr *rt = attrs[XFRMA_SEC_CTX];
            struct xfrm_policy tmp;

            err = verify_sec_ctx_len(attrs);
            if (err)
                  return err;

            memset(&tmp, 0, sizeof(struct xfrm_policy));
            if (rt) {
                  struct xfrm_user_sec_ctx *uctx = nla_data(rt);

                  if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
                        return err;
            }
            xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
                                 0, &err);
            security_xfrm_policy_free(&tmp);
      }

      if (xp == NULL)
            return -ENOENT;
      read_lock(&xp->lock);
      if (xp->dead) {
            read_unlock(&xp->lock);
            goto out;
      }

      read_unlock(&xp->lock);
      err = 0;
      if (up->hard) {
            xfrm_policy_delete(xp, p->dir);
            xfrm_audit_policy_delete(xp, 1, NETLINK_CB(skb).loginuid,
                               NETLINK_CB(skb).sid);

      } else {
            // reset the timers here?
            printk("Dont know what to do with soft policy expire\n");
      }
      km_policy_expired(xp, p->dir, up->hard, current->pid);

out:
      xfrm_pol_put(xp);
      return err;
}

static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct xfrm_state *x;
      int err;
      struct xfrm_user_expire *ue = nlmsg_data(nlh);
      struct xfrm_usersa_info *p = &ue->state;

      x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);

      err = -ENOENT;
      if (x == NULL)
            return err;

      spin_lock_bh(&x->lock);
      err = -EINVAL;
      if (x->km.state != XFRM_STATE_VALID)
            goto out;
      km_state_expired(x, ue->hard, current->pid);

      if (ue->hard) {
            __xfrm_state_delete(x);
            xfrm_audit_state_delete(x, 1, NETLINK_CB(skb).loginuid,
                              NETLINK_CB(skb).sid);
      }
      err = 0;
out:
      spin_unlock_bh(&x->lock);
      xfrm_state_put(x);
      return err;
}

static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
            struct nlattr **attrs)
{
      struct xfrm_policy *xp;
      struct xfrm_user_tmpl *ut;
      int i;
      struct nlattr *rt = attrs[XFRMA_TMPL];

      struct xfrm_user_acquire *ua = nlmsg_data(nlh);
      struct xfrm_state *x = xfrm_state_alloc();
      int err = -ENOMEM;

      if (!x)
            return err;

      err = verify_newpolicy_info(&ua->policy);
      if (err) {
            printk("BAD policy passed\n");
            kfree(x);
            return err;
      }

      /*   build an XP */
      xp = xfrm_policy_construct(&ua->policy, attrs, &err);
      if (!xp) {
            kfree(x);
            return err;
      }

      memcpy(&x->id, &ua->id, sizeof(ua->id));
      memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
      memcpy(&x->sel, &ua->sel, sizeof(ua->sel));

      ut = nla_data(rt);
      /* extract the templates and for each call km_key */
      for (i = 0; i < xp->xfrm_nr; i++, ut++) {
            struct xfrm_tmpl *t = &xp->xfrm_vec[i];
            memcpy(&x->id, &t->id, sizeof(x->id));
            x->props.mode = t->mode;
            x->props.reqid = t->reqid;
            x->props.family = ut->family;
            t->aalgos = ua->aalgos;
            t->ealgos = ua->ealgos;
            t->calgos = ua->calgos;
            err = km_query(x, t, xp);

      }

      kfree(x);
      kfree(xp);

      return 0;
}

#ifdef CONFIG_XFRM_MIGRATE
static int copy_from_user_migrate(struct xfrm_migrate *ma,
                          struct nlattr **attrs, int *num)
{
      struct nlattr *rt = attrs[XFRMA_MIGRATE];
      struct xfrm_user_migrate *um;
      int i, num_migrate;

      um = nla_data(rt);
      num_migrate = nla_len(rt) / sizeof(*um);

      if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
            return -EINVAL;

      for (i = 0; i < num_migrate; i++, um++, ma++) {
            memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
            memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
            memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
            memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));

            ma->proto = um->proto;
            ma->mode = um->mode;
            ma->reqid = um->reqid;

            ma->old_family = um->old_family;
            ma->new_family = um->new_family;
      }

      *num = i;
      return 0;
}

static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
                     struct nlattr **attrs)
{
      struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
      struct xfrm_migrate m[XFRM_MAX_DEPTH];
      u8 type;
      int err;
      int n = 0;

      if (attrs[XFRMA_MIGRATE] == NULL)
            return -EINVAL;

      err = copy_from_user_policy_type(&type, attrs);
      if (err)
            return err;

      err = copy_from_user_migrate((struct xfrm_migrate *)m,
                             attrs, &n);
      if (err)
            return err;

      if (!n)
            return 0;

      xfrm_migrate(&pi->sel, pi->dir, type, m, n);

      return 0;
}
#else
static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
                     struct nlattr **attrs)
{
      return -ENOPROTOOPT;
}
#endif

#ifdef CONFIG_XFRM_MIGRATE
static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
{
      struct xfrm_user_migrate um;

      memset(&um, 0, sizeof(um));
      um.proto = m->proto;
      um.mode = m->mode;
      um.reqid = m->reqid;
      um.old_family = m->old_family;
      memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
      memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
      um.new_family = m->new_family;
      memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
      memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));

      return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
}

static inline size_t xfrm_migrate_msgsize(int num_migrate)
{
      return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
             + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
             + userpolicy_type_attrsize();
}

static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
                   int num_migrate, struct xfrm_selector *sel,
                   u8 dir, u8 type)
{
      struct xfrm_migrate *mp;
      struct xfrm_userpolicy_id *pol_id;
      struct nlmsghdr *nlh;
      int i;

      nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
      if (nlh == NULL)
            return -EMSGSIZE;

      pol_id = nlmsg_data(nlh);
      /* copy data from selector, dir, and type to the pol_id */
      memset(pol_id, 0, sizeof(*pol_id));
      memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
      pol_id->dir = dir;

      if (copy_to_user_policy_type(type, skb) < 0)
            goto nlmsg_failure;

      for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
            if (copy_to_user_migrate(mp, skb) < 0)
                  goto nlmsg_failure;
      }

      return nlmsg_end(skb, nlh);
nlmsg_failure:
      nlmsg_cancel(skb, nlh);
      return -EMSGSIZE;
}

static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
                       struct xfrm_migrate *m, int num_migrate)
{
      struct sk_buff *skb;

      skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate), GFP_ATOMIC);
      if (skb == NULL)
            return -ENOMEM;

      /* build migrate */
      if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
            BUG();

      return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
}
#else
static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
                       struct xfrm_migrate *m, int num_migrate)
{
      return -ENOPROTOOPT;
}
#endif

#define XMSGSIZE(type) sizeof(struct type)

static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
      [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
      [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
      [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
      [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
      [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
      [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
      [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
      [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
      [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
      [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
      [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
      [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
      [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
      [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
      [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
      [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
      [XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
      [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
      [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
      [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
};

#undef XMSGSIZE

static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
      [XFRMA_ALG_AUTH]  = { .len = sizeof(struct xfrm_algo) },
      [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
      [XFRMA_ALG_COMP]  = { .len = sizeof(struct xfrm_algo) },
      [XFRMA_ENCAP]           = { .len = sizeof(struct xfrm_encap_tmpl) },
      [XFRMA_TMPL]            = { .len = sizeof(struct xfrm_user_tmpl) },
      [XFRMA_SEC_CTX]         = { .len = sizeof(struct xfrm_sec_ctx) },
      [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
      [XFRMA_REPLAY_VAL]      = { .len = sizeof(struct xfrm_replay_state) },
      [XFRMA_REPLAY_THRESH]   = { .type = NLA_U32 },
      [XFRMA_ETIMER_THRESH]   = { .type = NLA_U32 },
      [XFRMA_SRCADDR]         = { .len = sizeof(xfrm_address_t) },
      [XFRMA_COADDR]          = { .len = sizeof(xfrm_address_t) },
      [XFRMA_POLICY_TYPE]     = { .len = sizeof(struct xfrm_userpolicy_type)},
      [XFRMA_MIGRATE]         = { .len = sizeof(struct xfrm_user_migrate) },
};

static struct xfrm_link {
      int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
      int (*dump)(struct sk_buff *, struct netlink_callback *);
} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
      [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
      [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
      [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
                                       .dump = xfrm_dump_sa       },
      [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
      [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
      [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
                                       .dump = xfrm_dump_policy   },
      [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
      [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
      [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
      [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
      [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
      [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
      [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
      [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
      [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
      [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
      [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
      [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
      [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
};

static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
      struct nlattr *attrs[XFRMA_MAX+1];
      struct xfrm_link *link;
      int type, err;

      type = nlh->nlmsg_type;
      if (type > XFRM_MSG_MAX)
            return -EINVAL;

      type -= XFRM_MSG_BASE;
      link = &xfrm_dispatch[type];

      /* All operations require privileges, even GET */
      if (security_netlink_recv(skb, CAP_NET_ADMIN))
            return -EPERM;

      if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
           type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
          (nlh->nlmsg_flags & NLM_F_DUMP)) {
            if (link->dump == NULL)
                  return -EINVAL;

            return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL);
      }

      err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
                    xfrma_policy);
      if (err < 0)
            return err;

      if (link->doit == NULL)
            return -EINVAL;

      return link->doit(skb, nlh, attrs);
}

static void xfrm_netlink_rcv(struct sk_buff *skb)
{
      mutex_lock(&xfrm_cfg_mutex);
      netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
      mutex_unlock(&xfrm_cfg_mutex);
}

static inline size_t xfrm_expire_msgsize(void)
{
      return NLMSG_ALIGN(sizeof(struct xfrm_user_expire));
}

static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
{
      struct xfrm_user_expire *ue;
      struct nlmsghdr *nlh;

      nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
      if (nlh == NULL)
            return -EMSGSIZE;

      ue = nlmsg_data(nlh);
      copy_to_user_state(x, &ue->state);
      ue->hard = (c->data.hard != 0) ? 1 : 0;

      return nlmsg_end(skb, nlh);
}

static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
{
      struct sk_buff *skb;

      skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
      if (skb == NULL)
            return -ENOMEM;

      if (build_expire(skb, x, c) < 0)
            BUG();

      return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
}

static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
{
      struct sk_buff *skb;

      skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
      if (skb == NULL)
            return -ENOMEM;

      if (build_aevent(skb, x, c) < 0)
            BUG();

      return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
}

static int xfrm_notify_sa_flush(struct km_event *c)
{
      struct xfrm_usersa_flush *p;
      struct nlmsghdr *nlh;
      struct sk_buff *skb;
      int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));

      skb = nlmsg_new(len, GFP_ATOMIC);
      if (skb == NULL)
            return -ENOMEM;

      nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
      if (nlh == NULL) {
            kfree_skb(skb);
            return -EMSGSIZE;
      }

      p = nlmsg_data(nlh);
      p->proto = c->data.proto;

      nlmsg_end(skb, nlh);

      return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
}

static inline size_t xfrm_sa_len(struct xfrm_state *x)
{
      size_t l = 0;
      if (x->aalg)
            l += nla_total_size(xfrm_alg_len(x->aalg));
      if (x->ealg)
            l += nla_total_size(xfrm_alg_len(x->ealg));
      if (x->calg)
            l += nla_total_size(sizeof(*x->calg));
      if (x->encap)
            l += nla_total_size(sizeof(*x->encap));
      if (x->security)
            l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
                            x->security->ctx_len);
      if (x->coaddr)
            l += nla_total_size(sizeof(*x->coaddr));

      /* Must count this as this may become non-zero behind our back. */
      l += nla_total_size(sizeof(x->lastused));

      return l;
}

static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
{
      struct xfrm_usersa_info *p;
      struct xfrm_usersa_id *id;
      struct nlmsghdr *nlh;
      struct sk_buff *skb;
      int len = xfrm_sa_len(x);
      int headlen;

      headlen = sizeof(*p);
      if (c->event == XFRM_MSG_DELSA) {
            len += nla_total_size(headlen);
            headlen = sizeof(*id);
      }
      len += NLMSG_ALIGN(headlen);

      skb = nlmsg_new(len, GFP_ATOMIC);
      if (skb == NULL)
            return -ENOMEM;

      nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
      if (nlh == NULL)
            goto nla_put_failure;

      p = nlmsg_data(nlh);
      if (c->event == XFRM_MSG_DELSA) {
            struct nlattr *attr;

            id = nlmsg_data(nlh);
            memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
            id->spi = x->id.spi;
            id->family = x->props.family;
            id->proto = x->id.proto;

            attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
            if (attr == NULL)
                  goto nla_put_failure;

            p = nla_data(attr);
      }

      if (copy_to_user_state_extra(x, p, skb))
            goto nla_put_failure;

      nlmsg_end(skb, nlh);

      return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);

nla_put_failure:
      /* Somebody screwed up with xfrm_sa_len! */
      WARN_ON(1);
      kfree_skb(skb);
      return -1;
}

static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
{

      switch (c->event) {
      case XFRM_MSG_EXPIRE:
            return xfrm_exp_state_notify(x, c);
      case XFRM_MSG_NEWAE:
            return xfrm_aevent_state_notify(x, c);
      case XFRM_MSG_DELSA:
      case XFRM_MSG_UPDSA:
      case XFRM_MSG_NEWSA:
            return xfrm_notify_sa(x, c);
      case XFRM_MSG_FLUSHSA:
            return xfrm_notify_sa_flush(c);
      default:
             printk("xfrm_user: Unknown SA event %d\n", c->event);
             break;
      }

      return 0;

}

static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
                                struct xfrm_policy *xp)
{
      return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
             + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
             + nla_total_size(xfrm_user_sec_ctx_size(x->security))
             + userpolicy_type_attrsize();
}

static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
                   struct xfrm_tmpl *xt, struct xfrm_policy *xp,
                   int dir)
{
      struct xfrm_user_acquire *ua;
      struct nlmsghdr *nlh;
      __u32 seq = xfrm_get_acqseq();

      nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
      if (nlh == NULL)
            return -EMSGSIZE;

      ua = nlmsg_data(nlh);
      memcpy(&ua->id, &x->id, sizeof(ua->id));
      memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
      memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
      copy_to_user_policy(xp, &ua->policy, dir);
      ua->aalgos = xt->aalgos;
      ua->ealgos = xt->ealgos;
      ua->calgos = xt->calgos;
      ua->seq = x->km.seq = seq;

      if (copy_to_user_tmpl(xp, skb) < 0)
            goto nlmsg_failure;
      if (copy_to_user_state_sec_ctx(x, skb))
            goto nlmsg_failure;
      if (copy_to_user_policy_type(xp->type, skb) < 0)
            goto nlmsg_failure;

      return nlmsg_end(skb, nlh);

nlmsg_failure:
      nlmsg_cancel(skb, nlh);
      return -EMSGSIZE;
}

static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
                       struct xfrm_policy *xp, int dir)
{
      struct sk_buff *skb;

      skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
      if (skb == NULL)
            return -ENOMEM;

      if (build_acquire(skb, x, xt, xp, dir) < 0)
            BUG();

      return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
}

/* User gives us xfrm_user_policy_info followed by an array of 0
 * or more templates.
 */
static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
                                     u8 *data, int len, int *dir)
{
      struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
      struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
      struct xfrm_policy *xp;
      int nr;

      switch (sk->sk_family) {
      case AF_INET:
            if (opt != IP_XFRM_POLICY) {
                  *dir = -EOPNOTSUPP;
                  return NULL;
            }
            break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
      case AF_INET6:
            if (opt != IPV6_XFRM_POLICY) {
                  *dir = -EOPNOTSUPP;
                  return NULL;
            }
            break;
#endif
      default:
            *dir = -EINVAL;
            return NULL;
      }

      *dir = -EINVAL;

      if (len < sizeof(*p) ||
          verify_newpolicy_info(p))
            return NULL;

      nr = ((len - sizeof(*p)) / sizeof(*ut));
      if (validate_tmpl(nr, ut, p->sel.family))
            return NULL;

      if (p->dir > XFRM_POLICY_OUT)
            return NULL;

      xp = xfrm_policy_alloc(GFP_KERNEL);
      if (xp == NULL) {
            *dir = -ENOBUFS;
            return NULL;
      }

      copy_from_user_policy(xp, p);
      xp->type = XFRM_POLICY_TYPE_MAIN;
      copy_templates(xp, ut, nr);

      *dir = p->dir;

      return xp;
}

static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
{
      return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
             + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
             + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
             + userpolicy_type_attrsize();
}

static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
                     int dir, struct km_event *c)
{
      struct xfrm_user_polexpire *upe;
      struct nlmsghdr *nlh;
      int hard = c->data.hard;

      nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
      if (nlh == NULL)
            return -EMSGSIZE;

      upe = nlmsg_data(nlh);
      copy_to_user_policy(xp, &upe->pol, dir);
      if (copy_to_user_tmpl(xp, skb) < 0)
            goto nlmsg_failure;
      if (copy_to_user_sec_ctx(xp, skb))
            goto nlmsg_failure;
      if (copy_to_user_policy_type(xp->type, skb) < 0)
            goto nlmsg_failure;
      upe->hard = !!hard;

      return nlmsg_end(skb, nlh);

nlmsg_failure:
      nlmsg_cancel(skb, nlh);
      return -EMSGSIZE;
}

static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
{
      struct sk_buff *skb;

      skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
      if (skb == NULL)
            return -ENOMEM;

      if (build_polexpire(skb, xp, dir, c) < 0)
            BUG();

      return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
}

static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
{
      struct xfrm_userpolicy_info *p;
      struct xfrm_userpolicy_id *id;
      struct nlmsghdr *nlh;
      struct sk_buff *skb;
      int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
      int headlen;

      headlen = sizeof(*p);
      if (c->event == XFRM_MSG_DELPOLICY) {
            len += nla_total_size(headlen);
            headlen = sizeof(*id);
      }
      len += userpolicy_type_attrsize();
      len += NLMSG_ALIGN(headlen);

      skb = nlmsg_new(len, GFP_ATOMIC);
      if (skb == NULL)
            return -ENOMEM;

      nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
      if (nlh == NULL)
            goto nlmsg_failure;

      p = nlmsg_data(nlh);
      if (c->event == XFRM_MSG_DELPOLICY) {
            struct nlattr *attr;

            id = nlmsg_data(nlh);
            memset(id, 0, sizeof(*id));
            id->dir = dir;
            if (c->data.byid)
                  id->index = xp->index;
            else
                  memcpy(&id->sel, &xp->selector, sizeof(id->sel));

            attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
            if (attr == NULL)
                  goto nlmsg_failure;

            p = nla_data(attr);
      }

      copy_to_user_policy(xp, p, dir);
      if (copy_to_user_tmpl(xp, skb) < 0)
            goto nlmsg_failure;
      if (copy_to_user_policy_type(xp->type, skb) < 0)
            goto nlmsg_failure;

      nlmsg_end(skb, nlh);

      return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);

nlmsg_failure:
      kfree_skb(skb);
      return -1;
}

static int xfrm_notify_policy_flush(struct km_event *c)
{
      struct nlmsghdr *nlh;
      struct sk_buff *skb;

      skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
      if (skb == NULL)
            return -ENOMEM;

      nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
      if (nlh == NULL)
            goto nlmsg_failure;
      if (copy_to_user_policy_type(c->data.type, skb) < 0)
            goto nlmsg_failure;

      nlmsg_end(skb, nlh);

      return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);

nlmsg_failure:
      kfree_skb(skb);
      return -1;
}

static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
{

      switch (c->event) {
      case XFRM_MSG_NEWPOLICY:
      case XFRM_MSG_UPDPOLICY:
      case XFRM_MSG_DELPOLICY:
            return xfrm_notify_policy(xp, dir, c);
      case XFRM_MSG_FLUSHPOLICY:
            return xfrm_notify_policy_flush(c);
      case XFRM_MSG_POLEXPIRE:
            return xfrm_exp_policy_notify(xp, dir, c);
      default:
            printk("xfrm_user: Unknown Policy event %d\n", c->event);
      }

      return 0;

}

static inline size_t xfrm_report_msgsize(void)
{
      return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
}

static int build_report(struct sk_buff *skb, u8 proto,
                  struct xfrm_selector *sel, xfrm_address_t *addr)
{
      struct xfrm_user_report *ur;
      struct nlmsghdr *nlh;

      nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
      if (nlh == NULL)
            return -EMSGSIZE;

      ur = nlmsg_data(nlh);
      ur->proto = proto;
      memcpy(&ur->sel, sel, sizeof(ur->sel));

      if (addr)
            NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);

      return nlmsg_end(skb, nlh);

nla_put_failure:
      nlmsg_cancel(skb, nlh);
      return -EMSGSIZE;
}

static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
                      xfrm_address_t *addr)
{
      struct sk_buff *skb;

      skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
      if (skb == NULL)
            return -ENOMEM;

      if (build_report(skb, proto, sel, addr) < 0)
            BUG();

      return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
}

static struct xfrm_mgr netlink_mgr = {
      .id         = "netlink",
      .notify           = xfrm_send_state_notify,
      .acquire    = xfrm_send_acquire,
      .compile_policy   = xfrm_compile_policy,
      .notify_policy    = xfrm_send_policy_notify,
      .report           = xfrm_send_report,
      .migrate    = xfrm_send_migrate,
};

static int __init xfrm_user_init(void)
{
      struct sock *nlsk;

      printk(KERN_INFO "Initializing XFRM netlink socket\n");

      nlsk = netlink_kernel_create(&init_net, NETLINK_XFRM, XFRMNLGRP_MAX,
                             xfrm_netlink_rcv, NULL, THIS_MODULE);
      if (nlsk == NULL)
            return -ENOMEM;
      rcu_assign_pointer(xfrm_nl, nlsk);

      xfrm_register_km(&netlink_mgr);

      return 0;
}

static void __exit xfrm_user_exit(void)
{
      struct sock *nlsk = xfrm_nl;

      xfrm_unregister_km(&netlink_mgr);
      rcu_assign_pointer(xfrm_nl, NULL);
      synchronize_rcu();
      sock_release(nlsk->sk_socket);
}

module_init(xfrm_user_init);
module_exit(xfrm_user_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);


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