xfrm_user.c 55.5 KB
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/* 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
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 *
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 */

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#include <linux/crypto.h>
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#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/rtnetlink.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>
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#include <net/netlink.h>
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#include <asm/uaccess.h>
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
#include <linux/in6.h>
#endif
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#include <linux/audit.h>
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static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
{
	struct rtattr *rt = xfrma[type - 1];
	struct xfrm_algo *algp;
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	int len;
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	if (!rt)
		return 0;

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	len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
	if (len < 0)
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		return -EINVAL;

	algp = RTA_DATA(rt);
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	len -= (algp->alg_key_len + 7U) / 8;
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	if (len < 0)
		return -EINVAL;

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	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 int verify_encap_tmpl(struct rtattr **xfrma)
{
	struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
	struct xfrm_encap_tmpl *encap;

	if (!rt)
		return 0;

	if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
		return -EINVAL;

	return 0;
}

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static int verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
			   xfrm_address_t **addrp)
{
	struct rtattr *rt = xfrma[type - 1];

	if (!rt)
		return 0;

	if ((rt->rta_len - sizeof(*rt)) < sizeof(**addrp))
		return -EINVAL;

	if (addrp)
		*addrp = RTA_DATA(rt);

	return 0;
}
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static inline int verify_sec_ctx_len(struct rtattr **xfrma)
{
	struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1];
	struct xfrm_user_sec_ctx *uctx;
	int len = 0;

	if (!rt)
		return 0;

	if (rt->rta_len < sizeof(*uctx))
		return -EINVAL;

	uctx = RTA_DATA(rt);

	len += sizeof(struct xfrm_user_sec_ctx);
	len += uctx->ctx_len;

	if (uctx->len != len)
		return -EINVAL;

	return 0;
}


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static int verify_newsa_info(struct xfrm_usersa_info *p,
			     struct rtattr **xfrma)
{
	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 (!xfrma[XFRMA_ALG_AUTH-1]	||
		    xfrma[XFRMA_ALG_CRYPT-1]	||
		    xfrma[XFRMA_ALG_COMP-1])
			goto out;
		break;

	case IPPROTO_ESP:
		if ((!xfrma[XFRMA_ALG_AUTH-1] &&
		     !xfrma[XFRMA_ALG_CRYPT-1])	||
		    xfrma[XFRMA_ALG_COMP-1])
			goto out;
		break;

	case IPPROTO_COMP:
		if (!xfrma[XFRMA_ALG_COMP-1]	||
		    xfrma[XFRMA_ALG_AUTH-1]	||
		    xfrma[XFRMA_ALG_CRYPT-1])
			goto out;
		break;

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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	case IPPROTO_DSTOPTS:
	case IPPROTO_ROUTING:
		if (xfrma[XFRMA_ALG_COMP-1]	||
		    xfrma[XFRMA_ALG_AUTH-1]	||
		    xfrma[XFRMA_ALG_CRYPT-1]	||
		    xfrma[XFRMA_ENCAP-1]	||
		    xfrma[XFRMA_SEC_CTX-1]	||
		    !xfrma[XFRMA_COADDR-1])
			goto out;
		break;
#endif

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	default:
		goto out;
	};

	if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
		goto out;
	if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
		goto out;
	if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
		goto out;
	if ((err = verify_encap_tmpl(xfrma)))
		goto out;
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	if ((err = verify_sec_ctx_len(xfrma)))
		goto out;
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	if ((err = verify_one_addr(xfrma, XFRMA_COADDR, NULL)))
		goto out;
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	err = -EINVAL;
	switch (p->mode) {
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	case XFRM_MODE_TRANSPORT:
	case XFRM_MODE_TUNNEL:
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	case XFRM_MODE_ROUTEOPTIMIZATION:
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	case XFRM_MODE_BEET:
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		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 rtattr *u_arg)
{
	struct rtattr *rta = u_arg;
	struct xfrm_algo *p, *ualg;
	struct xfrm_algo_desc *algo;
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	int len;
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	if (!rta)
		return 0;

	ualg = RTA_DATA(rta);

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

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	len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
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	p = kmemdup(ualg, len, GFP_KERNEL);
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	if (!p)
		return -ENOMEM;

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

static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
{
	struct rtattr *rta = u_arg;
	struct xfrm_encap_tmpl *p, *uencap;

	if (!rta)
		return 0;

	uencap = RTA_DATA(rta);
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	p = kmemdup(uencap, sizeof(*p), GFP_KERNEL);
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	if (!p)
		return -ENOMEM;

	*encapp = p;
	return 0;
}

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static inline int xfrm_user_sec_ctx_size(struct xfrm_policy *xp)
{
	struct xfrm_sec_ctx *xfrm_ctx = xp->security;
	int len = 0;

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

static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
{
	struct xfrm_user_sec_ctx *uctx;

	if (!u_arg)
		return 0;

	uctx = RTA_DATA(u_arg);
	return security_xfrm_state_alloc(x, uctx);
}

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static int attach_one_addr(xfrm_address_t **addrpp, struct rtattr *u_arg)
{
	struct rtattr *rta = u_arg;
	xfrm_address_t *p, *uaddrp;

	if (!rta)
		return 0;

	uaddrp = RTA_DATA(rta);
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	p = kmemdup(uaddrp, sizeof(*p), GFP_KERNEL);
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	if (!p)
		return -ENOMEM;

	*addrpp = p;
	return 0;
}

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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;
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	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
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	x->props.flags = p->flags;
}

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/*
 * someday when pfkey also has support, we could have the code
 * somehow made shareable and move it to xfrm_state.c - JHS
 *
*/
static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
{
	int err = - EINVAL;
	struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
	struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
	struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
	struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];

	if (rp) {
		struct xfrm_replay_state *replay;
		if (RTA_PAYLOAD(rp) < sizeof(*replay))
			goto error;
		replay = RTA_DATA(rp);
		memcpy(&x->replay, replay, sizeof(*replay));
		memcpy(&x->preplay, replay, sizeof(*replay));
	}

	if (lt) {
		struct xfrm_lifetime_cur *ltime;
		if (RTA_PAYLOAD(lt) < sizeof(*ltime))
			goto error;
		ltime = RTA_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) {
		if (RTA_PAYLOAD(et) < sizeof(u32))
			goto error;
		x->replay_maxage = *(u32*)RTA_DATA(et);
	}

	if (rt) {
		if (RTA_PAYLOAD(rt) < sizeof(u32))
			goto error;
		x->replay_maxdiff = *(u32*)RTA_DATA(rt);
	}

	return 0;
error:
	return err;
}

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static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
					       struct rtattr **xfrma,
					       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,
				   xfrma[XFRMA_ALG_AUTH-1])))
		goto error;
	if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
				   xfrm_ealg_get_byname,
				   xfrma[XFRMA_ALG_CRYPT-1])))
		goto error;
	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
				   xfrm_calg_get_byname,
				   xfrma[XFRMA_ALG_COMP-1])))
		goto error;
	if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
		goto error;
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	if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
		goto error;
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	err = xfrm_init_state(x);
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	if (err)
		goto error;

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	if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
		goto error;

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	x->km.seq = p->seq;
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	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 */

	err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
	if (err	< 0)
		goto error;
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	return x;

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

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static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
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{
	struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
	struct xfrm_state *x;
	int err;
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	struct km_event c;
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	err = verify_newsa_info(p, xfrma);
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	if (err)
		return err;

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

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

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	xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
		       AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x);

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

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

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static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
						 struct rtattr **xfrma,
						 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;

		err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
		if (err)
			goto out;

		if (!saddr) {
			err = -EINVAL;
			goto out;
		}

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

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

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

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	x = xfrm_user_state_lookup(p, xfrma, &err);
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	if (x == NULL)
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		return err;
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	if ((err = security_xfrm_state_delete(x)) != 0)
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		goto out;

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

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	err = xfrm_state_delete(x);
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	if (err < 0)
		goto out;
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	c.seq = nlh->nlmsg_seq;
	c.pid = nlh->nlmsg_pid;
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	c.event = nlh->nlmsg_type;
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	km_state_notify(x, &c);
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out:
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	xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
		       AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);
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	xfrm_state_put(x);
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	return err;
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}

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));
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	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
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	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 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;
	unsigned char *b = skb->tail;

	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));
	nlh->nlmsg_flags = sp->nlmsg_flags;

	p = NLMSG_DATA(nlh);
	copy_to_user_state(x, p);

	if (x->aalg)
		RTA_PUT(skb, XFRMA_ALG_AUTH,
			sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
	if (x->ealg)
		RTA_PUT(skb, XFRMA_ALG_CRYPT,
			sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
	if (x->calg)
		RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);

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

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	if (x->security) {
		int ctx_size = sizeof(struct xfrm_sec_ctx) +
				x->security->ctx_len;
		struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
		struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);

		uctx->exttype = XFRMA_SEC_CTX;
		uctx->len = ctx_size;
		uctx->ctx_doi = x->security->ctx_doi;
		uctx->ctx_alg = x->security->ctx_alg;
		uctx->ctx_len = x->security->ctx_len;
		memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
	}
618 619 620 621

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

622 623 624
	if (x->lastused)
		RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused);

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	nlh->nlmsg_len = skb->tail - b;
out:
	sp->this_idx++;
	return 0;

nlmsg_failure:
rtattr_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

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];
646
	(void) xfrm_state_walk(0, dump_one_state, &info);
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	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 = alloc_skb(NLMSG_GOODSIZE, 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;
}

676 677
static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
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{
	struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
	struct xfrm_state *x;
	struct sk_buff *resp_skb;
682
	int err = -ESRCH;
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684
	x = xfrm_user_state_lookup(p, xfrma, &err);
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	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 = netlink_unicast(xfrm_nl, resp_skb,
				      NETLINK_CB(skb).pid, MSG_DONTWAIT);
	}
	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;
}

723 724
static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
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{
	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;

	resp_skb = ERR_PTR(-ENOENT);

	spin_lock_bh(&x->lock);
	if (x->km.state != XFRM_STATE_DEAD) {
		xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
		if (x->id.spi)
			resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
	}
	spin_unlock_bh(&x->lock);

	if (IS_ERR(resp_skb)) {
		err = PTR_ERR(resp_skb);
		goto out;
	}

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

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

783
static int verify_policy_dir(u8 dir)
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{
	switch (dir) {
	case XFRM_POLICY_IN:
	case XFRM_POLICY_OUT:
	case XFRM_POLICY_FWD:
		break;

	default:
		return -EINVAL;
	};

	return 0;
}

798
static int verify_policy_type(u8 type)
799 800 801 802 803 804 805 806 807 808 809 810 811 812 813
{
	switch (type) {
	case XFRM_POLICY_TYPE_MAIN:
#ifdef CONFIG_XFRM_SUB_POLICY
	case XFRM_POLICY_TYPE_SUB:
#endif
		break;

	default:
		return -EINVAL;
	};

	return 0;
}

L
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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);
}

854 855 856 857 858 859 860 861 862 863 864 865
static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
{
	struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
	struct xfrm_user_sec_ctx *uctx;

	if (!rt)
		return 0;

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

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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;
885
		t->encap_family = ut->family;
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	}
}

889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921
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;
}

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static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
{
	struct rtattr *rt = xfrma[XFRMA_TMPL-1];

	if (!rt) {
		pol->xfrm_nr = 0;
	} else {
929 930 931
		struct xfrm_user_tmpl *utmpl = RTA_DATA(rt);
		int nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
		int err;
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933 934 935
		err = validate_tmpl(nr, utmpl, pol->family);
		if (err)
			return err;
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		copy_templates(pol, RTA_DATA(rt), nr);
	}
	return 0;
}

942 943 944 945
static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
{
	struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
	struct xfrm_userpolicy_type *upt;
946
	u8 type = XFRM_POLICY_TYPE_MAIN;
947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964
	int err;

	if (rt) {
		if (rt->rta_len < sizeof(*upt))
			return -EINVAL;

		upt = RTA_DATA(rt);
		type = upt->type;
	}

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

	*tp = type;
	return 0;
}

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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 rtattr **xfrma, 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);
1002

1003 1004 1005 1006
	err = copy_from_user_policy_type(&xp->type, xfrma);
	if (err)
		goto error;

1007 1008
	if (!(err = copy_from_user_tmpl(xp, xfrma)))
		err = copy_from_user_sec_ctx(xp, xfrma);
1009 1010
	if (err)
		goto error;
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	return xp;
1013 1014 1015 1016
 error:
	*errp = err;
	kfree(xp);
	return NULL;
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}

1019 1020
static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
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{
	struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
	struct xfrm_policy *xp;
1024
	struct km_event c;
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	int err;
	int excl;

	err = verify_newpolicy_info(p);
1029 1030
	if (err)
		return err;
1031
	err = verify_sec_ctx_len(xfrma);
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	if (err)
		return err;

1035
	xp = xfrm_policy_construct(p, xfrma, &err);
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1036 1037 1038
	if (!xp)
		return err;

1039 1040 1041 1042
	/* 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 */
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1043 1044
	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
	err = xfrm_policy_insert(p->dir, xp, excl);
J
Joy Latten 已提交
1045 1046 1047
	xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
		       AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);

L
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1048
	if (err) {
1049
		security_xfrm_policy_free(xp);
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		kfree(xp);
		return err;
	}

1054
	c.event = nlh->nlmsg_type;
1055 1056 1057 1058
	c.seq = nlh->nlmsg_seq;
	c.pid = nlh->nlmsg_pid;
	km_policy_notify(xp, p->dir, &c);

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	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));
1077
		up->family = kp->encap_family;
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		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;
	}
	RTA_PUT(skb, XFRMA_TMPL,
		(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
		vec);

	return 0;

rtattr_failure:
	return -1;
}

1097
static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1098
{
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
	int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
	struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
	struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);

	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);
1109
	return 0;
1110

1111 1112 1113 1114 1115 1116 1117 1118
 rtattr_failure:
	return -1;
}

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);
1119 1120
	}
	return 0;
1121
}
1122

1123 1124 1125 1126 1127 1128
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;
1129 1130
}

1131
#ifdef CONFIG_XFRM_SUB_POLICY
1132
static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1133 1134 1135 1136
{
	struct xfrm_userpolicy_type upt;

	memset(&upt, 0, sizeof(upt));
1137
	upt.type = type;
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147

	RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);

	return 0;

rtattr_failure:
	return -1;
}

#else
1148
static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1149 1150 1151 1152 1153
{
	return 0;
}
#endif

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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;
	unsigned char *b = skb->tail;

	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));
	p = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = sp->nlmsg_flags;

	copy_to_user_policy(xp, p, dir);
	if (copy_to_user_tmpl(xp, skb) < 0)
		goto nlmsg_failure;
1175 1176
	if (copy_to_user_sec_ctx(xp, skb))
		goto nlmsg_failure;
1177
	if (copy_to_user_policy_type(xp->type, skb) < 0)
1178
		goto nlmsg_failure;
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	nlh->nlmsg_len = skb->tail - b;
out:
	sp->this_idx++;
	return 0;

nlmsg_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

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];
1200 1201 1202 1203
	(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
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	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 = alloc_skb(NLMSG_GOODSIZE, 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;
}

1234 1235
static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
L
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1236 1237 1238
{
	struct xfrm_policy *xp;
	struct xfrm_userpolicy_id *p;
1239
	u8 type = XFRM_POLICY_TYPE_MAIN;
L
Linus Torvalds 已提交
1240
	int err;
1241
	struct km_event c;
L
Linus Torvalds 已提交
1242 1243 1244 1245 1246
	int delete;

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

1247
	err = copy_from_user_policy_type(&type, xfrma);
1248 1249 1250
	if (err)
		return err;

L
Linus Torvalds 已提交
1251 1252 1253 1254 1255
	err = verify_policy_dir(p->dir);
	if (err)
		return err;

	if (p->index)
1256
		xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
1257
	else {
1258
		struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
1259 1260
		struct xfrm_policy tmp;

1261
		err = verify_sec_ctx_len(xfrma);
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271
		if (err)
			return err;

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

			if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
				return err;
		}
1272 1273
		xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
					   delete, &err);
1274 1275
		security_xfrm_policy_free(&tmp);
	}
L
Linus Torvalds 已提交
1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289
	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 = netlink_unicast(xfrm_nl, resp_skb,
					      NETLINK_CB(skb).pid,
					      MSG_DONTWAIT);
		}
1290
	} else {
1291 1292 1293 1294
		xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
			       AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);

		if (err != 0)
C
Catherine Zhang 已提交
1295
			goto out;
1296

1297
		c.data.byid = p->index;
1298
		c.event = nlh->nlmsg_type;
1299 1300 1301
		c.seq = nlh->nlmsg_seq;
		c.pid = nlh->nlmsg_pid;
		km_policy_notify(xp, p->dir, &c);
L
Linus Torvalds 已提交
1302 1303
	}

C
Catherine Zhang 已提交
1304
out:
1305
	xfrm_pol_put(xp);
L
Linus Torvalds 已提交
1306 1307 1308
	return err;
}

1309 1310
static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
L
Linus Torvalds 已提交
1311
{
1312
	struct km_event c;
L
Linus Torvalds 已提交
1313
	struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
J
Joy Latten 已提交
1314
	struct xfrm_audit audit_info;
L
Linus Torvalds 已提交
1315

J
Joy Latten 已提交
1316 1317 1318
	audit_info.loginuid = NETLINK_CB(skb).loginuid;
	audit_info.secid = NETLINK_CB(skb).sid;
	xfrm_state_flush(p->proto, &audit_info);
1319
	c.data.proto = p->proto;
1320
	c.event = nlh->nlmsg_type;
1321 1322 1323 1324
	c.seq = nlh->nlmsg_seq;
	c.pid = nlh->nlmsg_pid;
	km_state_notify(NULL, &c);

L
Linus Torvalds 已提交
1325 1326 1327
	return 0;
}

J
Jamal Hadi Salim 已提交
1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339

static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
{
	struct xfrm_aevent_id *id;
	struct nlmsghdr *nlh;
	struct xfrm_lifetime_cur ltime;
	unsigned char *b = skb->tail;

	nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
	id = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = 0;

1340
	memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
J
Jamal Hadi Salim 已提交
1341 1342 1343
	id->sa_id.spi = x->id.spi;
	id->sa_id.family = x->props.family;
	id->sa_id.proto = x->id.proto;
1344 1345
	memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
	id->reqid = x->props.reqid;
J
Jamal Hadi Salim 已提交
1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374
	id->flags = c->data.aevent;

	RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);

	ltime.bytes = x->curlft.bytes;
	ltime.packets = x->curlft.packets;
	ltime.add_time = x->curlft.add_time;
	ltime.use_time = x->curlft.use_time;

	RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);

	if (id->flags&XFRM_AE_RTHR) {
		RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
	}

	if (id->flags&XFRM_AE_ETHR) {
		u32 etimer = x->replay_maxage*10/HZ;
		RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
	}

	nlh->nlmsg_len = skb->tail - b;
	return skb->len;

rtattr_failure:
nlmsg_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

1375 1376
static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
J
Jamal Hadi Salim 已提交
1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400
{
	struct xfrm_state *x;
	struct sk_buff *r_skb;
	int err;
	struct km_event c;
	struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
	int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
	struct xfrm_usersa_id *id = &p->sa_id;

	len += RTA_SPACE(sizeof(struct xfrm_replay_state));
	len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));

	if (p->flags&XFRM_AE_RTHR)
		len+=RTA_SPACE(sizeof(u32));

	if (p->flags&XFRM_AE_ETHR)
		len+=RTA_SPACE(sizeof(u32));

	r_skb = alloc_skb(len, GFP_ATOMIC);
	if (r_skb == NULL)
		return -ENOMEM;

	x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
	if (x == NULL) {
P
Patrick McHardy 已提交
1401
		kfree_skb(r_skb);
J
Jamal Hadi Salim 已提交
1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423
		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 = netlink_unicast(xfrm_nl, r_skb,
			      NETLINK_CB(skb).pid, MSG_DONTWAIT);
	spin_unlock_bh(&x->lock);
	xfrm_state_put(x);
	return err;
}

1424 1425
static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
J
Jamal Hadi Salim 已提交
1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448
{
	struct xfrm_state *x;
	struct km_event c;
	int err = - EINVAL;
	struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
	struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
	struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];

	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);
1449
	err = xfrm_update_ae_params(x, xfrma);
J
Jamal Hadi Salim 已提交
1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464
	spin_unlock_bh(&x->lock);
	if (err	< 0)
		goto out;

	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;
}

1465 1466
static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
L
Linus Torvalds 已提交
1467
{
1468
	struct km_event c;
1469
	u8 type = XFRM_POLICY_TYPE_MAIN;
1470
	int err;
J
Joy Latten 已提交
1471
	struct xfrm_audit audit_info;
1472

1473
	err = copy_from_user_policy_type(&type, xfrma);
1474 1475
	if (err)
		return err;
1476

J
Joy Latten 已提交
1477 1478 1479
	audit_info.loginuid = NETLINK_CB(skb).loginuid;
	audit_info.secid = NETLINK_CB(skb).sid;
	xfrm_policy_flush(type, &audit_info);
1480
	c.data.type = type;
1481
	c.event = nlh->nlmsg_type;
1482 1483 1484
	c.seq = nlh->nlmsg_seq;
	c.pid = nlh->nlmsg_pid;
	km_policy_notify(NULL, 0, &c);
L
Linus Torvalds 已提交
1485 1486 1487
	return 0;
}

1488 1489
static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
1490 1491 1492 1493
{
	struct xfrm_policy *xp;
	struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
	struct xfrm_userpolicy_info *p = &up->pol;
1494
	u8 type = XFRM_POLICY_TYPE_MAIN;
1495 1496
	int err = -ENOENT;

1497
	err = copy_from_user_policy_type(&type, xfrma);
1498 1499 1500
	if (err)
		return err;

1501
	if (p->index)
1502
		xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
1503
	else {
1504
		struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
1505 1506
		struct xfrm_policy tmp;

1507
		err = verify_sec_ctx_len(xfrma);
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517
		if (err)
			return err;

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

			if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
				return err;
		}
1518 1519
		xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
					   0, &err);
1520 1521 1522 1523
		security_xfrm_policy_free(&tmp);
	}

	if (xp == NULL)
1524 1525
		return -ENOENT;
	read_lock(&xp->lock);
1526 1527 1528 1529 1530 1531 1532 1533 1534
	if (xp->dead) {
		read_unlock(&xp->lock);
		goto out;
	}

	read_unlock(&xp->lock);
	err = 0;
	if (up->hard) {
		xfrm_policy_delete(xp, p->dir);
J
Joy Latten 已提交
1535 1536 1537
		xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
				AUDIT_MAC_IPSEC_DELSPD, 1, xp, NULL);

1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548
	} 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;
}

1549 1550
static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
1551 1552 1553 1554 1555 1556 1557 1558
{
	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);

1559
	err = -ENOENT;
1560 1561 1562 1563
	if (x == NULL)
		return err;

	spin_lock_bh(&x->lock);
1564
	err = -EINVAL;
1565 1566 1567 1568
	if (x->km.state != XFRM_STATE_VALID)
		goto out;
	km_state_expired(x, ue->hard, current->pid);

J
Joy Latten 已提交
1569
	if (ue->hard) {
1570
		__xfrm_state_delete(x);
J
Joy Latten 已提交
1571 1572 1573
		xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
			       AUDIT_MAC_IPSEC_DELSA, 1, NULL, x);
	}
1574
	err = 0;
1575 1576 1577 1578 1579 1580
out:
	spin_unlock_bh(&x->lock);
	xfrm_state_put(x);
	return err;
}

1581 1582
static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603
{
	struct xfrm_policy *xp;
	struct xfrm_user_tmpl *ut;
	int i;
	struct rtattr *rt = xfrma[XFRMA_TMPL-1];

	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 */
1604 1605
	xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err);
	if (!xp) {
1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634
		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 = RTA_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;
}

1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804
#ifdef CONFIG_XFRM_MIGRATE
static int verify_user_migrate(struct rtattr **xfrma)
{
	struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
	struct xfrm_user_migrate *um;

	if (!rt)
		return -EINVAL;

	if ((rt->rta_len - sizeof(*rt)) < sizeof(*um))
		return -EINVAL;

	return 0;
}

static int copy_from_user_migrate(struct xfrm_migrate *ma,
				  struct rtattr **xfrma, int *num)
{
	struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
	struct xfrm_user_migrate *um;
	int i, num_migrate;

	um = RTA_DATA(rt);
	num_migrate = (rt->rta_len - sizeof(*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 rtattr **xfrma)
{
	struct xfrm_userpolicy_id *pi = NLMSG_DATA(nlh);
	struct xfrm_migrate m[XFRM_MAX_DEPTH];
	u8 type;
	int err;
	int n = 0;

	err = verify_user_migrate((struct rtattr **)xfrma);
	if (err)
		return err;

	err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
	if (err)
		return err;

	err = copy_from_user_migrate((struct xfrm_migrate *)m,
				     (struct rtattr **)xfrma, &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 rtattr **xfrma)
{
	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));

	RTA_PUT(skb, XFRMA_MIGRATE, sizeof(um), &um);
	return 0;

rtattr_failure:
	return -1;
}

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;
	unsigned char *b = skb->tail;
	int i;

	nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id));
	pol_id = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = 0;

	/* 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;
	}

	nlh->nlmsg_len = skb->tail - b;
	return skb->len;
nlmsg_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

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

	len = RTA_SPACE(sizeof(struct xfrm_user_migrate) * num_migrate);
	len += NLMSG_SPACE(sizeof(struct xfrm_userpolicy_id));
#ifdef CONFIG_XFRM_SUB_POLICY
	len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
#endif
	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;

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

	NETLINK_CB(skb).dst_group = XFRMNLGRP_MIGRATE;
	return netlink_broadcast(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
J
Jamal Hadi Salim 已提交
1805

1806 1807 1808 1809 1810 1811 1812 1813 1814 1815
#define XMSGSIZE(type) NLMSG_LENGTH(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),
1816
	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1817
	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1818 1819
	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1820
	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1821 1822
	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
J
Jamal Hadi Salim 已提交
1823 1824
	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1825
	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1826
	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
L
Linus Torvalds 已提交
1827 1828
};

1829 1830
#undef XMSGSIZE

L
Linus Torvalds 已提交
1831
static struct xfrm_link {
1832
	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct rtattr **);
L
Linus Torvalds 已提交
1833
	int (*dump)(struct sk_buff *, struct netlink_callback *);
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843
} 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 },
1844
	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
1845
	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1846 1847
	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
1848
	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1849 1850
	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
J
Jamal Hadi Salim 已提交
1851 1852
	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
1853
	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
L
Linus Torvalds 已提交
1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878
};

static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
{
	struct rtattr *xfrma[XFRMA_MAX];
	struct xfrm_link *link;
	int type, min_len;

	if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
		return 0;

	type = nlh->nlmsg_type;

	/* A control message: ignore them */
	if (type < XFRM_MSG_BASE)
		return 0;

	/* Unknown message: reply with EINVAL */
	if (type > XFRM_MSG_MAX)
		goto err_einval;

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

	/* All operations require privileges, even GET */
1879
	if (security_netlink_recv(skb, CAP_NET_ADMIN)) {
L
Linus Torvalds 已提交
1880 1881 1882 1883
		*errp = -EPERM;
		return -1;
	}

1884 1885 1886
	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
L
Linus Torvalds 已提交
1887 1888 1889 1890
		if (link->dump == NULL)
			goto err_einval;

		if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
1891
						link->dump, NULL)) != 0) {
L
Linus Torvalds 已提交
1892 1893
			return -1;
		}
1894 1895

		netlink_queue_skip(nlh, skb);
L
Linus Torvalds 已提交
1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920
		return -1;
	}

	memset(xfrma, 0, sizeof(xfrma));

	if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
		goto err_einval;

	if (nlh->nlmsg_len > min_len) {
		int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
		struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);

		while (RTA_OK(attr, attrlen)) {
			unsigned short flavor = attr->rta_type;
			if (flavor) {
				if (flavor > XFRMA_MAX)
					goto err_einval;
				xfrma[flavor - 1] = attr;
			}
			attr = RTA_NEXT(attr, attrlen);
		}
	}

	if (link->doit == NULL)
		goto err_einval;
1921
	*errp = link->doit(skb, nlh, xfrma);
L
Linus Torvalds 已提交
1922 1923 1924 1925 1926 1927 1928 1929 1930 1931

	return *errp;

err_einval:
	*errp = -EINVAL;
	return -1;
}

static void xfrm_netlink_rcv(struct sock *sk, int len)
{
1932
	unsigned int qlen = 0;
1933

L
Linus Torvalds 已提交
1934
	do {
A
Arjan van de Ven 已提交
1935
		mutex_lock(&xfrm_cfg_mutex);
1936
		netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
A
Arjan van de Ven 已提交
1937
		mutex_unlock(&xfrm_cfg_mutex);
L
Linus Torvalds 已提交
1938

1939
	} while (qlen);
L
Linus Torvalds 已提交
1940 1941
}

J
Jamal Hadi Salim 已提交
1942
static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
L
Linus Torvalds 已提交
1943 1944 1945 1946 1947
{
	struct xfrm_user_expire *ue;
	struct nlmsghdr *nlh;
	unsigned char *b = skb->tail;

J
Jamal Hadi Salim 已提交
1948
	nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
L
Linus Torvalds 已提交
1949 1950 1951 1952 1953
			sizeof(*ue));
	ue = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = 0;

	copy_to_user_state(x, &ue->state);
J
Jamal Hadi Salim 已提交
1954
	ue->hard = (c->data.hard != 0) ? 1 : 0;
L
Linus Torvalds 已提交
1955 1956 1957 1958 1959 1960 1961 1962 1963

	nlh->nlmsg_len = skb->tail - b;
	return skb->len;

nlmsg_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

1964
static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
L
Linus Torvalds 已提交
1965 1966
{
	struct sk_buff *skb;
1967
	int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
L
Linus Torvalds 已提交
1968

1969
	skb = alloc_skb(len, GFP_ATOMIC);
L
Linus Torvalds 已提交
1970 1971 1972
	if (skb == NULL)
		return -ENOMEM;

J
Jamal Hadi Salim 已提交
1973
	if (build_expire(skb, x, c) < 0)
L
Linus Torvalds 已提交
1974 1975
		BUG();

1976 1977
	NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
L
Linus Torvalds 已提交
1978 1979
}

J
Jamal Hadi Salim 已提交
1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997
static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
{
	struct sk_buff *skb;
	int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));

	len += RTA_SPACE(sizeof(struct xfrm_replay_state));
	len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;

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

	NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
}

1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015
static int xfrm_notify_sa_flush(struct km_event *c)
{
	struct xfrm_usersa_flush *p;
	struct nlmsghdr *nlh;
	struct sk_buff *skb;
	unsigned char *b;
	int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));

	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
	b = skb->tail;

	nlh = NLMSG_PUT(skb, c->pid, c->seq,
			XFRM_MSG_FLUSHSA, sizeof(*p));
	nlh->nlmsg_flags = 0;

	p = NLMSG_DATA(nlh);
2016
	p->proto = c->data.proto;
2017 2018 2019

	nlh->nlmsg_len = skb->tail - b;

2020 2021
	NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2022 2023 2024 2025 2026 2027

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

D
Dave Jones 已提交
2028
static inline int xfrm_sa_len(struct xfrm_state *x)
2029
{
2030
	int l = 0;
2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045
	if (x->aalg)
		l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
	if (x->ealg)
		l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
	if (x->calg)
		l += RTA_SPACE(sizeof(*x->calg));
	if (x->encap)
		l += RTA_SPACE(sizeof(*x->encap));

	return l;
}

static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
{
	struct xfrm_usersa_info *p;
2046
	struct xfrm_usersa_id *id;
2047 2048 2049 2050
	struct nlmsghdr *nlh;
	struct sk_buff *skb;
	unsigned char *b;
	int len = xfrm_sa_len(x);
2051 2052 2053 2054 2055 2056 2057 2058
	int headlen;

	headlen = sizeof(*p);
	if (c->event == XFRM_MSG_DELSA) {
		len += RTA_SPACE(headlen);
		headlen = sizeof(*id);
	}
	len += NLMSG_SPACE(headlen);
2059 2060 2061 2062 2063 2064

	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
	b = skb->tail;

2065
	nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2066 2067 2068
	nlh->nlmsg_flags = 0;

	p = NLMSG_DATA(nlh);
2069 2070 2071 2072 2073 2074 2075 2076 2077 2078
	if (c->event == XFRM_MSG_DELSA) {
		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;

		p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
	}

2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094
	copy_to_user_state(x, p);

	if (x->aalg)
		RTA_PUT(skb, XFRMA_ALG_AUTH,
			sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
	if (x->ealg)
		RTA_PUT(skb, XFRMA_ALG_CRYPT,
			sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
	if (x->calg)
		RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);

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

	nlh->nlmsg_len = skb->tail - b;

2095 2096
	NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107

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

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

	switch (c->event) {
2108
	case XFRM_MSG_EXPIRE:
2109
		return xfrm_exp_state_notify(x, c);
J
Jamal Hadi Salim 已提交
2110 2111
	case XFRM_MSG_NEWAE:
		return xfrm_aevent_state_notify(x, c);
2112 2113 2114
	case XFRM_MSG_DELSA:
	case XFRM_MSG_UPDSA:
	case XFRM_MSG_NEWSA:
2115
		return xfrm_notify_sa(x, c);
2116
	case XFRM_MSG_FLUSHSA:
2117 2118 2119 2120 2121 2122 2123 2124 2125 2126
		return xfrm_notify_sa_flush(c);
	default:
		 printk("xfrm_user: Unknown SA event %d\n", c->event);
		 break;
	}

	return 0;

}

L
Linus Torvalds 已提交
2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151
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;
	unsigned char *b = skb->tail;
	__u32 seq = xfrm_get_acqseq();

	nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
			sizeof(*ua));
	ua = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = 0;

	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;
2152
	if (copy_to_user_state_sec_ctx(x, skb))
2153
		goto nlmsg_failure;
2154
	if (copy_to_user_policy_type(xp->type, skb) < 0)
2155
		goto nlmsg_failure;
L
Linus Torvalds 已提交
2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172

	nlh->nlmsg_len = skb->tail - b;
	return skb->len;

nlmsg_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

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

	len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
	len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
2173
	len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
2174 2175 2176
#ifdef CONFIG_XFRM_SUB_POLICY
	len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
#endif
L
Linus Torvalds 已提交
2177 2178 2179 2180 2181 2182 2183
	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;

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

2184 2185
	NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
L
Linus Torvalds 已提交
2186 2187 2188 2189 2190
}

/* User gives us xfrm_user_policy_info followed by an array of 0
 * or more templates.
 */
2191
static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
L
Linus Torvalds 已提交
2192 2193 2194 2195 2196 2197 2198
					       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;

2199
	switch (sk->sk_family) {
L
Linus Torvalds 已提交
2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225
	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));
2226
	if (validate_tmpl(nr, ut, p->sel.family))
L
Linus Torvalds 已提交
2227 2228
		return NULL;

2229 2230 2231
	if (p->dir > XFRM_POLICY_OUT)
		return NULL;

L
Linus Torvalds 已提交
2232 2233 2234 2235 2236 2237 2238
	xp = xfrm_policy_alloc(GFP_KERNEL);
	if (xp == NULL) {
		*dir = -ENOBUFS;
		return NULL;
	}

	copy_from_user_policy(xp, p);
2239
	xp->type = XFRM_POLICY_TYPE_MAIN;
L
Linus Torvalds 已提交
2240 2241 2242 2243 2244 2245 2246 2247
	copy_templates(xp, ut, nr);

	*dir = p->dir;

	return xp;
}

static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
J
Jamal Hadi Salim 已提交
2248
			   int dir, struct km_event *c)
L
Linus Torvalds 已提交
2249 2250 2251
{
	struct xfrm_user_polexpire *upe;
	struct nlmsghdr *nlh;
J
Jamal Hadi Salim 已提交
2252
	int hard = c->data.hard;
L
Linus Torvalds 已提交
2253 2254
	unsigned char *b = skb->tail;

J
Jamal Hadi Salim 已提交
2255
	nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
L
Linus Torvalds 已提交
2256 2257 2258 2259 2260 2261
	upe = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = 0;

	copy_to_user_policy(xp, &upe->pol, dir);
	if (copy_to_user_tmpl(xp, skb) < 0)
		goto nlmsg_failure;
2262 2263
	if (copy_to_user_sec_ctx(xp, skb))
		goto nlmsg_failure;
2264
	if (copy_to_user_policy_type(xp->type, skb) < 0)
2265
		goto nlmsg_failure;
L
Linus Torvalds 已提交
2266 2267 2268 2269 2270 2271 2272 2273 2274 2275
	upe->hard = !!hard;

	nlh->nlmsg_len = skb->tail - b;
	return skb->len;

nlmsg_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

2276
static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
L
Linus Torvalds 已提交
2277 2278 2279 2280 2281 2282
{
	struct sk_buff *skb;
	size_t len;

	len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
	len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
2283
	len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
2284 2285 2286
#ifdef CONFIG_XFRM_SUB_POLICY
	len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
#endif
L
Linus Torvalds 已提交
2287 2288 2289 2290
	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;

J
Jamal Hadi Salim 已提交
2291
	if (build_polexpire(skb, xp, dir, c) < 0)
L
Linus Torvalds 已提交
2292 2293
		BUG();

2294 2295
	NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
L
Linus Torvalds 已提交
2296 2297
}

2298 2299 2300
static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
{
	struct xfrm_userpolicy_info *p;
2301
	struct xfrm_userpolicy_id *id;
2302 2303 2304 2305
	struct nlmsghdr *nlh;
	struct sk_buff *skb;
	unsigned char *b;
	int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2306 2307 2308 2309 2310 2311 2312
	int headlen;

	headlen = sizeof(*p);
	if (c->event == XFRM_MSG_DELPOLICY) {
		len += RTA_SPACE(headlen);
		headlen = sizeof(*id);
	}
2313 2314 2315
#ifdef CONFIG_XFRM_SUB_POLICY
	len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
#endif
2316
	len += NLMSG_SPACE(headlen);
2317 2318 2319 2320 2321 2322

	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
	b = skb->tail;

2323
	nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2324 2325

	p = NLMSG_DATA(nlh);
2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336
	if (c->event == XFRM_MSG_DELPOLICY) {
		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));

		p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
	}
2337 2338 2339 2340 2341 2342

	nlh->nlmsg_flags = 0;

	copy_to_user_policy(xp, p, dir);
	if (copy_to_user_tmpl(xp, skb) < 0)
		goto nlmsg_failure;
2343
	if (copy_to_user_policy_type(xp->type, skb) < 0)
2344
		goto nlmsg_failure;
2345 2346 2347

	nlh->nlmsg_len = skb->tail - b;

2348 2349
	NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2350 2351

nlmsg_failure:
2352
rtattr_failure:
2353 2354 2355 2356 2357 2358 2359 2360 2361
	kfree_skb(skb);
	return -1;
}

static int xfrm_notify_policy_flush(struct km_event *c)
{
	struct nlmsghdr *nlh;
	struct sk_buff *skb;
	unsigned char *b;
2362
	int len = 0;
2363
#ifdef CONFIG_XFRM_SUB_POLICY
2364
	len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2365
#endif
2366
	len += NLMSG_LENGTH(0);
2367 2368 2369 2370 2371 2372 2373 2374

	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
	b = skb->tail;


	nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
2375
	nlh->nlmsg_flags = 0;
2376 2377
	if (copy_to_user_policy_type(c->data.type, skb) < 0)
		goto nlmsg_failure;
2378 2379 2380

	nlh->nlmsg_len = skb->tail - b;

2381 2382
	NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2383 2384 2385 2386 2387 2388 2389 2390 2391 2392

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) {
2393 2394 2395
	case XFRM_MSG_NEWPOLICY:
	case XFRM_MSG_UPDPOLICY:
	case XFRM_MSG_DELPOLICY:
2396
		return xfrm_notify_policy(xp, dir, c);
2397
	case XFRM_MSG_FLUSHPOLICY:
2398
		return xfrm_notify_policy_flush(c);
2399
	case XFRM_MSG_POLEXPIRE:
2400 2401 2402 2403 2404 2405 2406 2407 2408
		return xfrm_exp_policy_notify(xp, dir, c);
	default:
		printk("xfrm_user: Unknown Policy event %d\n", c->event);
	}

	return 0;

}

2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452
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;
	unsigned char *b = skb->tail;

	nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur));
	ur = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = 0;

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

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

	nlh->nlmsg_len = skb->tail - b;
	return skb->len;

nlmsg_failure:
rtattr_failure:
	skb_trim(skb, b - skb->data);
	return -1;
}

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

	len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report)));
	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;

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

	NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
}

L
Linus Torvalds 已提交
2453 2454 2455 2456 2457 2458
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,
2459
	.report		= xfrm_send_report,
2460
	.migrate	= xfrm_send_migrate,
L
Linus Torvalds 已提交
2461 2462 2463 2464
};

static int __init xfrm_user_init(void)
{
2465 2466
	struct sock *nlsk;

2467
	printk(KERN_INFO "Initializing XFRM netlink socket\n");
L
Linus Torvalds 已提交
2468

2469
	nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
2470
				     xfrm_netlink_rcv, THIS_MODULE);
2471
	if (nlsk == NULL)
L
Linus Torvalds 已提交
2472
		return -ENOMEM;
2473
	rcu_assign_pointer(xfrm_nl, nlsk);
L
Linus Torvalds 已提交
2474 2475 2476 2477 2478 2479 2480 2481

	xfrm_register_km(&netlink_mgr);

	return 0;
}

static void __exit xfrm_user_exit(void)
{
2482 2483
	struct sock *nlsk = xfrm_nl;

L
Linus Torvalds 已提交
2484
	xfrm_unregister_km(&netlink_mgr);
2485 2486 2487
	rcu_assign_pointer(xfrm_nl, NULL);
	synchronize_rcu();
	sock_release(nlsk->sk_socket);
L
Linus Torvalds 已提交
2488 2489 2490 2491 2492
}

module_init(xfrm_user_init);
module_exit(xfrm_user_exit);
MODULE_LICENSE("GPL");
2493
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2494