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  • xfrm_user.c 61.64 KiB
    /* 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 inline int aead_len(struct xfrm_algo_aead *alg)
    {
    	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
    }
    
    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:
    	case XFRMA_ALG_CRYPT:
    	case XFRMA_ALG_COMP:
    		break;
    
    	default:
    		return -EINVAL;
    	}
    
    	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
    	return 0;
    }
    
    static int verify_aead(struct nlattr **attrs)
    {
    	struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
    	struct xfrm_algo_aead *algp;
    
    	if (!rt)
    		return 0;
    
    	algp = nla_data(rt);
    	if (nla_len(rt) < aead_len(algp))
    		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_AEAD]	||
    		    attrs[XFRMA_ALG_CRYPT]	||
    		    attrs[XFRMA_ALG_COMP])
    			goto out;
    		break;
    
    	case IPPROTO_ESP:
    		if (attrs[XFRMA_ALG_COMP])
    			goto out;
    		if (!attrs[XFRMA_ALG_AUTH] &&
    		    !attrs[XFRMA_ALG_CRYPT] &&
    		    !attrs[XFRMA_ALG_AEAD])
    			goto out;
    		if ((attrs[XFRMA_ALG_AUTH] ||
    		     attrs[XFRMA_ALG_CRYPT]) &&
    		    attrs[XFRMA_ALG_AEAD])
    			goto out;
    		break;
    
    	case IPPROTO_COMP:
    		if (!attrs[XFRMA_ALG_COMP]	||
    		    attrs[XFRMA_ALG_AEAD]	||
    		    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_AEAD]	||
    		    attrs[XFRMA_ALG_CRYPT]	||
    		    attrs[XFRMA_ENCAP]		||
    		    attrs[XFRMA_SEC_CTX]	||
    		    !attrs[XFRMA_COADDR])
    			goto out;
    		break;
    #endif
    
    	default:
    		goto out;
    	}
    
    	if ((err = verify_aead(attrs)))
    		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 int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
    		       struct nlattr *rta)
    {
    	struct xfrm_algo_aead *p, *ualg;
    	struct xfrm_algo_desc *algo;
    
    	if (!rta)
    		return 0;
    
    	ualg = nla_data(rta);
    
    	algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
    	if (!algo)
    		return -ENOSYS;
    	*props = algo->desc.sadb_alg_id;
    
    	p = kmemdup(ualg, aead_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;
    
    	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
    		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 net *net,
    					       struct xfrm_usersa_info *p,
    					       struct nlattr **attrs,
    					       int *errp)
    {
    	struct xfrm_state *x = xfrm_state_alloc(net);
    	int err = -ENOMEM;
    
    	if (!x)
    		goto error_no_put;
    
    	copy_from_user_state(x, p);
    
    	if ((err = attach_aead(&x->aead, &x->props.ealgo,
    			       attrs[XFRMA_ALG_AEAD])))
    		goto error;
    	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 = net->xfrm.sysctl_aevent_rseqth;
    	/* sysctl_xfrm_aevent_etime is in 100ms units */
    	x->replay_maxage = (net->xfrm.sysctl_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 net *net = sock_net(skb->sk);
    	struct xfrm_usersa_info *p = nlmsg_data(nlh);
    	struct xfrm_state *x;
    	int err;
    	struct km_event c;
    	uid_t loginuid = NETLINK_CB(skb).loginuid;
    	u32 sessionid = NETLINK_CB(skb).sessionid;
    	u32 sid = NETLINK_CB(skb).sid;
    
    	err = verify_newsa_info(p, attrs);
    	if (err)
    		return err;
    
    	x = xfrm_state_construct(net, 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, loginuid, sessionid, 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 net *net,
    						 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(net, &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(net, &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 net *net = sock_net(skb->sk);
    	struct xfrm_state *x;
    	int err = -ESRCH;
    	struct km_event c;
    	struct xfrm_usersa_id *p = nlmsg_data(nlh);
    	uid_t loginuid = NETLINK_CB(skb).loginuid;
    	u32 sessionid = NETLINK_CB(skb).sessionid;
    	u32 sid = NETLINK_CB(skb).sid;
    
    	x = xfrm_user_state_lookup(net, 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, loginuid, sessionid, 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;
    };
    
    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->aead)
    		NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
    	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;
    
    	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);
    	return 0;
    
    nla_put_failure:
    	nlmsg_cancel(skb, nlh);
    	return err;
    }
    
    static int xfrm_dump_sa_done(struct netlink_callback *cb)
    {
    	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
    	xfrm_state_walk_done(walk);
    	return 0;
    }
    
    static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
    {
    	struct net *net = sock_net(skb->sk);
    	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
    	struct xfrm_dump_info info;
    
    	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
    		     sizeof(cb->args) - sizeof(cb->args[0]));
    
    	info.in_skb = cb->skb;
    	info.out_skb = skb;
    	info.nlmsg_seq = cb->nlh->nlmsg_seq;
    	info.nlmsg_flags = NLM_F_MULTI;
    
    	if (!cb->args[0]) {
    		cb->args[0] = 1;
    		xfrm_state_walk_init(walk, 0);
    	}
    
    	(void) xfrm_state_walk(net, walk, dump_one_state, &info);
    
    	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;
    
    	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 net *net = sock_net(skb->sk);
    	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(net->xfrm.nlsk, 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 net *net = sock_net(skb->sk);
    	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(net->xfrm.nlsk, r_skb, spid);
    }
    
    static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
    		struct nlattr **attrs)
    {
    	struct net *net = sock_net(skb->sk);
    	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(net, 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(net->xfrm.nlsk, 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 net *net = sock_net(skb->sk);
    	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(net, 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(net, 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(net->xfrm.nlsk, 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->security, 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;
    		/* If all masks are ~0, then we allow all algorithms. */
    		t->allalgs = !~(t->aalgos & t->ealgos & t->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 net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
    {
    	struct xfrm_policy *xp = xfrm_policy_alloc(net, 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;
    	xp->walk.dead = 1;
    	xfrm_policy_destroy(xp);
    	return NULL;
    }
    
    static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
    		struct nlattr **attrs)
    {
    	struct net *net = sock_net(skb->sk);
    	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
    	struct xfrm_policy *xp;
    	struct km_event c;
    	int err;
    	int excl;
    	uid_t loginuid = NETLINK_CB(skb).loginuid;
    	u32 sessionid = NETLINK_CB(skb).sessionid;
    	u32 sid = NETLINK_CB(skb).sid;
    
    	err = verify_newpolicy_info(p);
    	if (err)
    		return err;
    	err = verify_sec_ctx_len(attrs);
    	if (err)
    		return err;
    
    	xp = xfrm_policy_construct(net, 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, loginuid, sessionid, sid);
    
    	if (err) {
    		security_xfrm_policy_free(xp->security);
    		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;
    
    	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);
    	return 0;
    
    nlmsg_failure:
    	nlmsg_cancel(skb, nlh);
    	return -EMSGSIZE;
    }
    
    static int xfrm_dump_policy_done(struct netlink_callback *cb)
    {
    	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
    
    	xfrm_policy_walk_done(walk);
    	return 0;
    }
    
    static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
    {
    	struct net *net = sock_net(skb->sk);
    	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
    	struct xfrm_dump_info info;
    
    	BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
    		     sizeof(cb->args) - sizeof(cb->args[0]));
    
    	info.in_skb = cb->skb;
    	info.out_skb = skb;
    	info.nlmsg_seq = cb->nlh->nlmsg_seq;
    	info.nlmsg_flags = NLM_F_MULTI;
    
    	if (!cb->args[0]) {
    		cb->args[0] = 1;
    		xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
    	}
    
    	(void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
    
    	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;
    
    	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 net *net = sock_net(skb->sk);
    	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(net, type, p->dir, p->index, delete, &err);
    	else {
    		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
    		struct xfrm_sec_ctx *ctx;
    
    		err = verify_sec_ctx_len(attrs);
    		if (err)
    			return err;
    
    		ctx = NULL;
    		if (rt) {
    			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
    
    			err = security_xfrm_policy_alloc(&ctx, uctx);
    			if (err)
    				return err;
    		}
    		xp = xfrm_policy_bysel_ctx(net, type, p->dir, &p->sel, ctx,
    					   delete, &err);
    		security_xfrm_policy_free(ctx);
    	}
    	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(net->xfrm.nlsk, resp_skb,
    					    NETLINK_CB(skb).pid);
    		}
    	} else {
    		uid_t loginuid = NETLINK_CB(skb).loginuid;
    		u32 sessionid = NETLINK_CB(skb).sessionid;
    		u32 sid = NETLINK_CB(skb).sid;
    
    		xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
    					 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 net *net = sock_net(skb->sk);
    	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.sessionid = NETLINK_CB(skb).sessionid;
    	audit_info.secid = NETLINK_CB(skb).sid;
    	err = xfrm_state_flush(net, 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;
    	c.net = net;
    	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 net *net = sock_net(skb->sk);
    	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(net, &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(net->xfrm.nlsk, 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 net *net = sock_net(skb->sk);
    	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(net, &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 net *net = sock_net(skb->sk);
    	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.sessionid = NETLINK_CB(skb).sessionid;
    	audit_info.secid = NETLINK_CB(skb).sid;
    	err = xfrm_policy_flush(net, 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;
    	c.net = net;
    	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 net *net = sock_net(skb->sk);
    	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(net, type, p->dir, p->index, 0, &err);
    	else {
    		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
    		struct xfrm_sec_ctx *ctx;
    
    		err = verify_sec_ctx_len(attrs);
    		if (err)
    			return err;
    
    		ctx = NULL;
    		if (rt) {
    			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
    
    			err = security_xfrm_policy_alloc(&ctx, uctx);
    			if (err)
    				return err;
    		}
    		xp = xfrm_policy_bysel_ctx(net, type, p->dir, &p->sel, ctx, 0, &err);
    		security_xfrm_policy_free(ctx);
    	}
    	if (xp == NULL)
    		return -ENOENT;
    
    	read_lock(&xp->lock);
    	if (xp->walk.dead) {
    		read_unlock(&xp->lock);
    		goto out;
    	}
    
    	read_unlock(&xp->lock);
    	err = 0;
    	if (up->hard) {
    		uid_t loginuid = NETLINK_CB(skb).loginuid;
    		uid_t sessionid = NETLINK_CB(skb).sessionid;
    		u32 sid = NETLINK_CB(skb).sid;
    		xfrm_policy_delete(xp, p->dir);
    		xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, 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 net *net = sock_net(skb->sk);
    	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(net, &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) {
    		uid_t loginuid = NETLINK_CB(skb).loginuid;
    		uid_t sessionid = NETLINK_CB(skb).sessionid;
    		u32 sid = NETLINK_CB(skb).sid;
    		__xfrm_state_delete(x);
    		xfrm_audit_state_delete(x, 1, loginuid, sessionid, 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 net *net = sock_net(skb->sk);
    	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(net);
    	int err = -ENOMEM;
    
    	if (!x)
    		goto nomem;
    
    	err = verify_newpolicy_info(&ua->policy);
    	if (err)
    		goto bad_policy;
    
    	/*   build an XP */
    	xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
    	if (!xp)
    		goto free_state;
    
    	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;
    
    bad_policy:
    	printk("BAD policy passed\n");
    free_state:
    	kfree(x);
    nomem:
    	return err;
    }
    
    #ifdef CONFIG_XFRM_MIGRATE
    static int copy_from_user_migrate(struct xfrm_migrate *ma,
    				  struct xfrm_kmaddress *k,
    				  struct nlattr **attrs, int *num)
    {
    	struct nlattr *rt = attrs[XFRMA_MIGRATE];
    	struct xfrm_user_migrate *um;
    	int i, num_migrate;
    
    	if (k != NULL) {
    		struct xfrm_user_kmaddress *uk;
    
    		uk = nla_data(attrs[XFRMA_KMADDRESS]);
    		memcpy(&k->local, &uk->local, sizeof(k->local));
    		memcpy(&k->remote, &uk->remote, sizeof(k->remote));
    		k->family = uk->family;
    		k->reserved = uk->reserved;
    	}
    
    	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];
    	struct xfrm_kmaddress km, *kmp;
    	u8 type;
    	int err;
    	int n = 0;
    
    	if (attrs[XFRMA_MIGRATE] == NULL)
    		return -EINVAL;
    
    	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
    
    	err = copy_from_user_policy_type(&type, attrs);
    	if (err)
    		return err;
    
    	err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
    	if (err)
    		return err;
    
    	if (!n)
    		return 0;
    
    	xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
    
    	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 int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb)
    {
    	struct xfrm_user_kmaddress uk;
    
    	memset(&uk, 0, sizeof(uk));
    	uk.family = k->family;
    	uk.reserved = k->reserved;
    	memcpy(&uk.local, &k->local, sizeof(uk.local));
    	memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
    
    	return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
    }
    
    static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
    {
    	return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
    	      + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
    	      + 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_kmaddress *k,
    			 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 (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
    			goto nlmsg_failure;
    
    	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 xfrm_kmaddress *k)
    {
    	struct net *net = &init_net;
    	struct sk_buff *skb;
    
    	skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
    	if (skb == NULL)
    		return -ENOMEM;
    
    	/* build migrate */
    	if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
    		BUG();
    
    	return nlmsg_multicast(net->xfrm.nlsk, 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,
    			     struct xfrm_kmaddress *k)
    {
    	return -ENOPROTOOPT;
    }
    #endif
    
    /* For the xfrm_usersa_info cases we have to work around some 32-bit vs.
     * 64-bit compatability issues.  On 32-bit the structure is 220 bytes, but
     * for 64-bit it gets padded out to 224 bytes.  Those bytes are just
     * padding and don't have any content we care about.  Therefore as long
     * as we have enough bytes for the content we can make both cases work.
     */
    
    #define XMSGSIZE(type) sizeof(struct type)
    
    static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
    	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = 220, /* see above */
    	[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] = 220, /* see above */
    	[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_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
    	[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) },
    	[XFRMA_KMADDRESS]	= { .len = sizeof(struct xfrm_user_kmaddress) },
    };
    
    static struct xfrm_link {
    	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
    	int (*dump)(struct sk_buff *, struct netlink_callback *);
    	int (*done)(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,
    						   .done = xfrm_dump_sa_done  },
    	[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,
    						   .done = xfrm_dump_policy_done },
    	[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 net *net = sock_net(skb->sk);
    	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(net->xfrm.nlsk, skb, nlh, link->dump, link->done);
    	}
    
    	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 net *net = xs_net(x);
    	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(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
    }
    
    static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
    {
    	struct net *net = xs_net(x);
    	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(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
    }
    
    static int xfrm_notify_sa_flush(struct km_event *c)
    {
    	struct net *net = c->net;
    	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(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
    }
    
    static inline size_t xfrm_sa_len(struct xfrm_state *x)
    {
    	size_t l = 0;
    	if (x->aead)
    		l += nla_total_size(aead_len(x->aead));
    	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 x->lastused as it may become non-zero behind our back. */
    	l += nla_total_size(sizeof(u64));
    
    	return l;
    }
    
    static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
    {
    	struct net *net = xs_net(x);
    	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(net->xfrm.nlsk, 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 net *net = xs_net(x);
    	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(net->xfrm.nlsk, 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 net *net = sock_net(sk);
    	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(net, 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 net *net = xp_net(xp);
    	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(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
    }
    
    static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
    {
    	struct net *net = xp_net(xp);
    	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(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
    
    nlmsg_failure:
    	kfree_skb(skb);
    	return -1;
    }
    
    static int xfrm_notify_policy_flush(struct km_event *c)
    {
    	struct net *net = c->net;
    	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(net->xfrm.nlsk, 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(struct net *net, 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(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
    }
    
    static inline size_t xfrm_mapping_msgsize(void)
    {
    	return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
    }
    
    static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
    			 xfrm_address_t *new_saddr, __be16 new_sport)
    {
    	struct xfrm_user_mapping *um;
    	struct nlmsghdr *nlh;
    
    	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
    	if (nlh == NULL)
    		return -EMSGSIZE;
    
    	um = nlmsg_data(nlh);
    
    	memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
    	um->id.spi = x->id.spi;
    	um->id.family = x->props.family;
    	um->id.proto = x->id.proto;
    	memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
    	memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
    	um->new_sport = new_sport;
    	um->old_sport = x->encap->encap_sport;
    	um->reqid = x->props.reqid;
    
    	return nlmsg_end(skb, nlh);
    }
    
    static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
    			     __be16 sport)
    {
    	struct net *net = xs_net(x);
    	struct sk_buff *skb;
    
    	if (x->id.proto != IPPROTO_ESP)
    		return -EINVAL;
    
    	if (!x->encap)
    		return -EINVAL;
    
    	skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
    	if (skb == NULL)
    		return -ENOMEM;
    
    	if (build_mapping(skb, x, ipaddr, sport) < 0)
    		BUG();
    
    	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, 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,
    	.new_mapping	= xfrm_send_mapping,
    };
    
    static int __net_init xfrm_user_net_init(struct net *net)
    {
    	struct sock *nlsk;
    
    	nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX,
    				     xfrm_netlink_rcv, NULL, THIS_MODULE);
    	if (nlsk == NULL)
    		return -ENOMEM;
    	rcu_assign_pointer(net->xfrm.nlsk, nlsk);
    	return 0;
    }
    
    static void __net_exit xfrm_user_net_exit(struct net *net)
    {
    	struct sock *nlsk = net->xfrm.nlsk;
    
    	rcu_assign_pointer(net->xfrm.nlsk, NULL);
    	synchronize_rcu();
    	netlink_kernel_release(nlsk);
    }
    
    static struct pernet_operations xfrm_user_net_ops = {
    	.init = xfrm_user_net_init,
    	.exit = xfrm_user_net_exit,
    };
    
    static int __init xfrm_user_init(void)
    {
    	int rv;
    
    	printk(KERN_INFO "Initializing XFRM netlink socket\n");
    
    	rv = register_pernet_subsys(&xfrm_user_net_ops);
    	if (rv < 0)
    		return rv;
    	rv = xfrm_register_km(&netlink_mgr);
    	if (rv < 0)
    		unregister_pernet_subsys(&xfrm_user_net_ops);
    	return rv;
    }
    
    static void __exit xfrm_user_exit(void)
    {
    	xfrm_unregister_km(&netlink_mgr);
    	unregister_pernet_subsys(&xfrm_user_net_ops);
    }
    
    module_init(xfrm_user_init);
    module_exit(xfrm_user_exit);
    MODULE_LICENSE("GPL");
    MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);