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linux/net/xfrm/xfrm_user.c
Venkat Yekkirala 5b368e61c2 IPsec: correct semantics for SELinux policy matching 
Currently when an IPSec policy rule doesn't specify a security
context, it is assumed to be "unlabeled" by SELinux, and so
the IPSec policy rule fails to match to a flow that it would
otherwise match to, unless one has explicitly added an SELinux
policy rule allowing the flow to "polmatch" to the "unlabeled"
IPSec policy rules. In the absence of such an explicitly added
SELinux policy rule, the IPSec policy rule fails to match and
so the packet(s) flow in clear text without the otherwise applicable
xfrm(s) applied.

The above SELinux behavior violates the SELinux security notion of
"deny by default" which should actually translate to "encrypt by
default" in the above case.

This was first reported by Evgeniy Polyakov and the way James Morris
was seeing the problem was when connecting via IPsec to a
confined service on an SELinux box (vsftpd), which did not have the
appropriate SELinux policy permissions to send packets via IPsec.

With this patch applied, SELinux "polmatching" of flows Vs. IPSec
policy rules will only come into play when there's a explicit context
specified for the IPSec policy rule (which also means there's corresponding
SELinux policy allowing appropriate domains/flows to polmatch to this context).

Secondly, when a security module is loaded (in this case, SELinux), the
security_xfrm_policy_lookup() hook can return errors other than access denied,
such as -EINVAL.  We were not handling that correctly, and in fact
inverting the return logic and propagating a false "ok" back up to
xfrm_lookup(), which then allowed packets to pass as if they were not
associated with an xfrm policy.

The solution for this is to first ensure that errno values are
correctly propagated all the way back up through the various call chains
from security_xfrm_policy_lookup(), and handled correctly.

Then, flow_cache_lookup() is modified, so that if the policy resolver
fails (typically a permission denied via the security module), the flow
cache entry is killed rather than having a null policy assigned (which
indicates that the packet can pass freely).  This also forces any future
lookups for the same flow to consult the security module (e.g. SELinux)
for current security policy (rather than, say, caching the error on the
flow cache entry).

This patch: Fix the selinux side of things.

This makes sure SELinux polmatching of flow contexts to IPSec policy
rules comes into play only when an explicit context is associated
with the IPSec policy rule.

Also, this no longer defaults the context of a socket policy to
the context of the socket since the "no explicit context" case
is now handled properly.

Signed-off-by: Venkat Yekkirala <vyekkirala@TrustedCS.com>
Signed-off-by: James Morris <jmorris@namei.org>
2006-10-11 23:59:37 -07:00

2247 lines
49 KiB
C
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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
*
*/
#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/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>
#include <net/netlink.h>
#include <asm/uaccess.h>
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
#include <linux/in6.h>
#endif
static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
{
struct rtattr *rt = xfrma[type - 1];
struct xfrm_algo *algp;
int len;
if (!rt)
return 0;
len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
if (len < 0)
return -EINVAL;
algp = RTA_DATA(rt);
len -= (algp->alg_key_len + 7U) / 8;
if (len < 0)
return -EINVAL;
switch (type) {
case XFRMA_ALG_AUTH:
if (!algp->alg_key_len &&
strcmp(algp->alg_name, "digest_null") != 0)
return -EINVAL;
break;
case XFRMA_ALG_CRYPT:
if (!algp->alg_key_len &&
strcmp(algp->alg_name, "cipher_null") != 0)
return -EINVAL;
break;
case XFRMA_ALG_COMP:
/* Zero length keys are legal. */
break;
default:
return -EINVAL;
};
algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
return 0;
}
static 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;
}
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;
}
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;
}
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;
#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
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;
if ((err = verify_sec_ctx_len(xfrma)))
goto out;
if ((err = verify_one_addr(xfrma, XFRMA_COADDR, NULL)))
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 rtattr *u_arg)
{
struct rtattr *rta = u_arg;
struct xfrm_algo *p, *ualg;
struct xfrm_algo_desc *algo;
int len;
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;
len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
p = kmalloc(len, GFP_KERNEL);
if (!p)
return -ENOMEM;
memcpy(p, ualg, len);
strcpy(p->alg_name, algo->name);
*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);
p = kmalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return -ENOMEM;
memcpy(p, uencap, sizeof(*p));
*encapp = p;
return 0;
}
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);
}
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);
p = kmalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return -ENOMEM;
memcpy(p, uaddrp, sizeof(*p));
*addrpp = p;
return 0;
}
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;
x->props.saddr = p->saddr;
x->props.flags = p->flags;
}
/*
* 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;
}
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;
if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
goto error;
err = xfrm_init_state(x);
if (err)
goto error;
if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
goto error;
x->km.seq = p->seq;
x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
/* sysctl_xfrm_aevent_etime is in 100ms units */
x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
x->preplay.bitmap = 0;
x->preplay.seq = x->replay.seq+x->replay_maxdiff;
x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
/* override default values from above */
err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
if (err < 0)
goto error;
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, void **xfrma)
{
struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
struct xfrm_state *x;
int err;
struct km_event c;
err = verify_newsa_info(p, (struct rtattr **)xfrma);
if (err)
return err;
x = xfrm_state_construct(p, (struct rtattr **)xfrma, &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);
if (err < 0) {
x->km.state = XFRM_STATE_DEAD;
__xfrm_state_put(x);
goto out;
}
c.seq = nlh->nlmsg_seq;
c.pid = nlh->nlmsg_pid;
c.event = nlh->nlmsg_type;
km_state_notify(x, &c);
out:
xfrm_state_put(x);
return err;
}
static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
struct 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;
}
x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
p->family);
}
out:
if (!x && errp)
*errp = err;
return x;
}
static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
struct xfrm_state *x;
int err = -ESRCH;
struct km_event c;
struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &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_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));
p->saddr = x->props.saddr;
p->mode = x->props.mode;
p->replay_window = x->props.replay_window;
p->reqid = x->props.reqid;
p->family = x->props.family;
p->flags = x->props.flags;
p->seq = x->km.seq;
}
struct xfrm_dump_info {
struct sk_buff *in_skb;
struct sk_buff *out_skb;
u32 nlmsg_seq;
u16 nlmsg_flags;
int start_idx;
int this_idx;
};
static int 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);
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);
}
if (x->coaddr)
RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
if (x->lastused)
RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused);
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];
(void) xfrm_state_walk(0, dump_one_state, &info);
cb->args[0] = info.this_idx;
return skb->len;
}
static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
struct xfrm_state *x, u32 seq)
{
struct xfrm_dump_info info;
struct sk_buff *skb;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb)
return ERR_PTR(-ENOMEM);
NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
info.in_skb = in_skb;
info.out_skb = skb;
info.nlmsg_seq = seq;
info.nlmsg_flags = 0;
info.this_idx = info.start_idx = 0;
if (dump_one_state(x, 0, &info)) {
kfree_skb(skb);
return NULL;
}
return skb;
}
static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
struct xfrm_state *x;
struct sk_buff *resp_skb;
int err = -ESRCH;
x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &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 = 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;
}
static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
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;
}
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 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);
}
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;
}
}
static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
{
struct rtattr *rt = xfrma[XFRMA_TMPL-1];
struct xfrm_user_tmpl *utmpl;
int nr;
if (!rt) {
pol->xfrm_nr = 0;
} else {
nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
if (nr > XFRM_MAX_DEPTH)
return -EINVAL;
copy_templates(pol, RTA_DATA(rt), nr);
}
return 0;
}
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;
__u8 type = XFRM_POLICY_TYPE_MAIN;
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;
}
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);
err = copy_from_user_policy_type(&xp->type, xfrma);
if (err)
goto error;
if (!(err = copy_from_user_tmpl(xp, xfrma)))
err = copy_from_user_sec_ctx(xp, xfrma);
if (err)
goto error;
return xp;
error:
*errp = err;
kfree(xp);
return NULL;
}
static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
struct xfrm_policy *xp;
struct km_event c;
int err;
int excl;
err = verify_newpolicy_info(p);
if (err)
return err;
err = verify_sec_ctx_len((struct rtattr **)xfrma);
if (err)
return err;
xp = xfrm_policy_construct(p, (struct rtattr **)xfrma, &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);
if (err) {
security_xfrm_policy_free(xp);
kfree(xp);
return err;
}
c.event = nlh->nlmsg_type;
c.seq = nlh->nlmsg_seq;
c.pid = nlh->nlmsg_pid;
km_policy_notify(xp, p->dir, &c);
xfrm_pol_put(xp);
return 0;
}
static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
{
struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
int i;
if (xp->xfrm_nr == 0)
return 0;
for (i = 0; i < xp->xfrm_nr; i++) {
struct xfrm_user_tmpl *up = &vec[i];
struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
memcpy(&up->id, &kp->id, sizeof(up->id));
up->family = xp->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;
}
RTA_PUT(skb, XFRMA_TMPL,
(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
vec);
return 0;
rtattr_failure:
return -1;
}
static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
{
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);
return 0;
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);
}
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;
}
#ifdef CONFIG_XFRM_SUB_POLICY
static int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb)
{
struct xfrm_userpolicy_type upt;
memset(&upt, 0, sizeof(upt));
upt.type = xp->type;
RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
return 0;
rtattr_failure:
return -1;
}
#else
static inline int copy_to_user_policy_type(struct xfrm_policy *xp, 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;
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;
if (copy_to_user_sec_ctx(xp, skb))
goto nlmsg_failure;
if (copy_to_user_policy_type(xp, skb) < 0)
goto nlmsg_failure;
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];
(void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
#ifdef CONFIG_XFRM_SUB_POLICY
(void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
#endif
cb->args[0] = info.this_idx;
return skb->len;
}
static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
struct xfrm_policy *xp,
int dir, u32 seq)
{
struct xfrm_dump_info info;
struct sk_buff *skb;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return ERR_PTR(-ENOMEM);
NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
info.in_skb = in_skb;
info.out_skb = skb;
info.nlmsg_seq = seq;
info.nlmsg_flags = 0;
info.this_idx = info.start_idx = 0;
if (dump_one_policy(xp, dir, 0, &info) < 0) {
kfree_skb(skb);
return NULL;
}
return skb;
}
static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
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, (struct rtattr **)xfrma);
if (err)
return err;
err = verify_policy_dir(p->dir);
if (err)
return err;
if (p->index)
xp = xfrm_policy_byid(type, p->dir, p->index, delete);
else {
struct rtattr **rtattrs = (struct rtattr **)xfrma;
struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
struct xfrm_policy tmp;
err = verify_sec_ctx_len(rtattrs);
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;
}
xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, delete);
security_xfrm_policy_free(&tmp);
}
if (xp == NULL)
return -ENOENT;
if (!delete) {
struct sk_buff *resp_skb;
resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
if (IS_ERR(resp_skb)) {
err = PTR_ERR(resp_skb);
} else {
err = netlink_unicast(xfrm_nl, resp_skb,
NETLINK_CB(skb).pid,
MSG_DONTWAIT);
}
} else {
if ((err = security_xfrm_policy_delete(xp)) != 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);
}
xfrm_pol_put(xp);
out:
return err;
}
static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
struct km_event c;
struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
xfrm_state_flush(p->proto);
c.data.proto = p->proto;
c.event = nlh->nlmsg_type;
c.seq = nlh->nlmsg_seq;
c.pid = nlh->nlmsg_pid;
km_state_notify(NULL, &c);
return 0;
}
static 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;
id->sa_id.daddr = x->id.daddr;
id->sa_id.spi = x->id.spi;
id->sa_id.family = x->props.family;
id->sa_id.proto = x->id.proto;
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;
}
static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
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) {
kfree(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 = netlink_unicast(xfrm_nl, r_skb,
NETLINK_CB(skb).pid, MSG_DONTWAIT);
spin_unlock_bh(&x->lock);
xfrm_state_put(x);
return err;
}
static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
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);
err = xfrm_update_ae_params(x,(struct rtattr **)xfrma);
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;
}
static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
struct km_event c;
__u8 type = XFRM_POLICY_TYPE_MAIN;
int err;
err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
if (err)
return err;
xfrm_policy_flush(type);
c.data.type = type;
c.event = nlh->nlmsg_type;
c.seq = nlh->nlmsg_seq;
c.pid = nlh->nlmsg_pid;
km_policy_notify(NULL, 0, &c);
return 0;
}
static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
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, (struct rtattr **)xfrma);
if (err)
return err;
if (p->index)
xp = xfrm_policy_byid(type, p->dir, p->index, 0);
else {
struct rtattr **rtattrs = (struct rtattr **)xfrma;
struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
struct xfrm_policy tmp;
err = verify_sec_ctx_len(rtattrs);
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;
}
xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, 0);
security_xfrm_policy_free(&tmp);
}
if (xp == NULL)
return err;
read_lock(&xp->lock);
if (xp->dead) {
read_unlock(&xp->lock);
goto out;
}
read_unlock(&xp->lock);
err = 0;
if (up->hard) {
xfrm_policy_delete(xp, p->dir);
} 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, void **xfrma)
{
struct xfrm_state *x;
int err;
struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
struct xfrm_usersa_info *p = &ue->state;
x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
err = -ENOENT;
if (x == NULL)
return err;
err = -EINVAL;
spin_lock_bh(&x->lock);
if (x->km.state != XFRM_STATE_VALID)
goto out;
km_state_expired(x, ue->hard, current->pid);
if (ue->hard)
__xfrm_state_delete(x);
out:
spin_unlock_bh(&x->lock);
xfrm_state_put(x);
return err;
}
static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
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 */
xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err); if (!xp) {
kfree(x);
return err;
}
memcpy(&x->id, &ua->id, sizeof(ua->id));
memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
ut = 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;
}
#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),
[XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
[XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
[XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
[XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
[XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
[XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(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),
};
#undef XMSGSIZE
static struct xfrm_link {
int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
int (*dump)(struct sk_buff *, struct netlink_callback *);
} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
[XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
[XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
[XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
.dump = xfrm_dump_sa },
[XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
[XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
[XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
.dump = xfrm_dump_policy },
[XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
[XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
[XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
[XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
[XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
[XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
[XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
[XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
[XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
};
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 */
if (security_netlink_recv(skb, CAP_NET_ADMIN)) {
*errp = -EPERM;
return -1;
}
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)
goto err_einval;
if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
link->dump, NULL)) != 0) {
return -1;
}
netlink_queue_skip(nlh, skb);
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;
*errp = link->doit(skb, nlh, (void **) &xfrma);
return *errp;
err_einval:
*errp = -EINVAL;
return -1;
}
static void xfrm_netlink_rcv(struct sock *sk, int len)
{
unsigned int qlen = 0;
do {
mutex_lock(&xfrm_cfg_mutex);
netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
mutex_unlock(&xfrm_cfg_mutex);
} while (qlen);
}
static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
{
struct xfrm_user_expire *ue;
struct nlmsghdr *nlh;
unsigned char *b = skb->tail;
nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
sizeof(*ue));
ue = NLMSG_DATA(nlh);
nlh->nlmsg_flags = 0;
copy_to_user_state(x, &ue->state);
ue->hard = (c->data.hard != 0) ? 1 : 0;
nlh->nlmsg_len = skb->tail - b;
return skb->len;
nlmsg_failure:
skb_trim(skb, b - skb->data);
return -1;
}
static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
{
struct sk_buff *skb;
int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
skb = alloc_skb(len, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
if (build_expire(skb, x, c) < 0)
BUG();
NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
}
static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
{
struct sk_buff *skb;
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);
}
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);
p->proto = c->data.proto;
nlh->nlmsg_len = skb->tail - b;
NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
nlmsg_failure:
kfree_skb(skb);
return -1;
}
static int inline xfrm_sa_len(struct xfrm_state *x)
{
int l = 0;
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;
struct xfrm_usersa_id *id;
struct nlmsghdr *nlh;
struct sk_buff *skb;
unsigned char *b;
int len = xfrm_sa_len(x);
int headlen;
headlen = sizeof(*p);
if (c->event == XFRM_MSG_DELSA) {
len += RTA_SPACE(headlen);
headlen = sizeof(*id);
}
len += NLMSG_SPACE(headlen);
skb = alloc_skb(len, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
b = skb->tail;
nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
nlh->nlmsg_flags = 0;
p = NLMSG_DATA(nlh);
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)));
}
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;
NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
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) {
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 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;
if (copy_to_user_state_sec_ctx(x, skb))
goto nlmsg_failure;
if (copy_to_user_policy_type(xp, 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_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));
len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
skb = alloc_skb(len, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
if (build_acquire(skb, x, xt, xp, dir) < 0)
BUG();
NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
}
/* User gives us xfrm_user_policy_info followed by an array of 0
* or more templates.
*/
static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
u8 *data, int len, int *dir)
{
struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
struct xfrm_policy *xp;
int nr;
switch (sk->sk_family) {
case AF_INET:
if (opt != IP_XFRM_POLICY) {
*dir = -EOPNOTSUPP;
return NULL;
}
break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case AF_INET6:
if (opt != IPV6_XFRM_POLICY) {
*dir = -EOPNOTSUPP;
return NULL;
}
break;
#endif
default:
*dir = -EINVAL;
return NULL;
}
*dir = -EINVAL;
if (len < sizeof(*p) ||
verify_newpolicy_info(p))
return NULL;
nr = ((len - sizeof(*p)) / sizeof(*ut));
if (nr > XFRM_MAX_DEPTH)
return NULL;
if (p->dir > XFRM_POLICY_OUT)
return NULL;
xp = xfrm_policy_alloc(GFP_KERNEL);
if (xp == NULL) {
*dir = -ENOBUFS;
return NULL;
}
copy_from_user_policy(xp, p);
xp->type = XFRM_POLICY_TYPE_MAIN;
copy_templates(xp, ut, nr);
*dir = p->dir;
return xp;
}
static 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;
unsigned char *b = skb->tail;
nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
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;
if (copy_to_user_sec_ctx(xp, skb))
goto nlmsg_failure;
if (copy_to_user_policy_type(xp, skb) < 0)
goto nlmsg_failure;
upe->hard = !!hard;
nlh->nlmsg_len = skb->tail - b;
return skb->len;
nlmsg_failure:
skb_trim(skb, b - skb->data);
return -1;
}
static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
{
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));
len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
skb = alloc_skb(len, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
if (build_polexpire(skb, xp, dir, c) < 0)
BUG();
NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
}
static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
{
struct xfrm_userpolicy_info *p;
struct xfrm_userpolicy_id *id;
struct nlmsghdr *nlh;
struct sk_buff *skb;
unsigned char *b;
int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
int headlen;
headlen = sizeof(*p);
if (c->event == XFRM_MSG_DELPOLICY) {
len += RTA_SPACE(headlen);
headlen = sizeof(*id);
}
len += NLMSG_SPACE(headlen);
skb = alloc_skb(len, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
b = skb->tail;
nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
p = NLMSG_DATA(nlh);
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)));
}
nlh->nlmsg_flags = 0;
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, skb) < 0)
goto nlmsg_failure;
nlh->nlmsg_len = skb->tail - b;
NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
nlmsg_failure:
rtattr_failure:
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;
#ifdef CONFIG_XFRM_SUB_POLICY
struct xfrm_userpolicy_type upt;
#endif
int len = NLMSG_LENGTH(0);
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);
nlh->nlmsg_flags = 0;
#ifdef CONFIG_XFRM_SUB_POLICY
memset(&upt, 0, sizeof(upt));
upt.type = c->data.type;
RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
#endif
nlh->nlmsg_len = skb->tail - b;
NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
nlmsg_failure:
#ifdef CONFIG_XFRM_SUB_POLICY
rtattr_failure:
#endif
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 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);
}
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,
};
static int __init xfrm_user_init(void)
{
struct sock *nlsk;
printk(KERN_INFO "Initializing XFRM netlink socket\n");
nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
xfrm_netlink_rcv, THIS_MODULE);
if (nlsk == NULL)
return -ENOMEM;
rcu_assign_pointer(xfrm_nl, nlsk);
xfrm_register_km(&netlink_mgr);
return 0;
}
static void __exit xfrm_user_exit(void)
{
struct sock *nlsk = xfrm_nl;
xfrm_unregister_km(&netlink_mgr);
rcu_assign_pointer(xfrm_nl, NULL);
synchronize_rcu();
sock_release(nlsk->sk_socket);
}
module_init(xfrm_user_init);
module_exit(xfrm_user_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
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