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31c26852cb
linux/net/xfrm/xfrm_user.c
Herbert Xu 31c26852cb [IPSEC]: Verify key payload in verify_one_algo 
We need to verify that the payload contains enough data so that
attach_one_algo can copy alg_key_len bits from the payload.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-05-19 12:39:49 -07:00

1270 lines
27 KiB
C
Raw Blame History

/* 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/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/netlink.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 <asm/uaccess.h>
static struct sock *xfrm_nl;
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_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;
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;
err = -EINVAL;
switch (p->mode) {
case 0:
case 1:
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);
*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 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;
}
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;
err = -ENOENT;
x->type = xfrm_get_type(x->id.proto, x->props.family);
if (x->type == NULL)
goto error;
err = x->type->init_state(x, NULL);
if (err)
goto error;
x->curlft.add_time = (unsigned long) xtime.tv_sec;
x->km.state = XFRM_STATE_VALID;
x->km.seq = p->seq;
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;
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;
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);
}
return err;
}
static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
struct xfrm_state *x;
struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
if (x == NULL)
return -ESRCH;
if (xfrm_state_kern(x)) {
xfrm_state_put(x);
return -EPERM;
}
xfrm_state_delete(x);
xfrm_state_put(x);
return 0;
}
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);
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(IPSEC_PROTO_ANY, 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;
x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
err = -ESRCH;
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_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 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 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_tmpl(xp, xfrma);
if (err) {
*errp = err;
kfree(xp);
xp = NULL;
}
return xp;
}
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;
int err;
int excl;
err = verify_newpolicy_info(p);
if (err)
return err;
xp = xfrm_policy_construct(p, (struct rtattr **) xfrma, &err);
if (!xp)
return err;
excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
err = xfrm_policy_insert(p->dir, xp, excl);
if (err) {
kfree(xp);
return err;
}
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 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;
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(dump_one_policy, &info);
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;
int err;
int delete;
p = NLMSG_DATA(nlh);
delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
err = verify_policy_dir(p->dir);
if (err)
return err;
if (p->index)
xp = xfrm_policy_byid(p->dir, p->index, delete);
else
xp = xfrm_policy_bysel(p->dir, &p->sel, delete);
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);
}
}
xfrm_pol_put(xp);
return err;
}
static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
xfrm_state_flush(p->proto);
return 0;
}
static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
xfrm_policy_flush();
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),
};
#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_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
[XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
[XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
};
static int xfrm_done(struct netlink_callback *cb)
{
return 0;
}
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)) {
*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)) {
u32 rlen;
if (link->dump == NULL)
goto err_einval;
if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
link->dump,
xfrm_done)) != 0) {
return -1;
}
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
if (rlen > skb->len)
rlen = skb->len;
skb_pull(skb, rlen);
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 int xfrm_user_rcv_skb(struct sk_buff *skb)
{
int err;
struct nlmsghdr *nlh;
while (skb->len >= NLMSG_SPACE(0)) {
u32 rlen;
nlh = (struct nlmsghdr *) skb->data;
if (nlh->nlmsg_len < sizeof(*nlh) ||
skb->len < nlh->nlmsg_len)
return 0;
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
if (rlen > skb->len)
rlen = skb->len;
if (xfrm_user_rcv_msg(skb, nlh, &err) < 0) {
if (err == 0)
return -1;
netlink_ack(skb, nlh, err);
} else if (nlh->nlmsg_flags & NLM_F_ACK)
netlink_ack(skb, nlh, 0);
skb_pull(skb, rlen);
}
return 0;
}
static void xfrm_netlink_rcv(struct sock *sk, int len)
{
unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
do {
struct sk_buff *skb;
down(&xfrm_cfg_sem);
if (qlen > skb_queue_len(&sk->sk_receive_queue))
qlen = skb_queue_len(&sk->sk_receive_queue);
for (; qlen; qlen--) {
skb = skb_dequeue(&sk->sk_receive_queue);
if (xfrm_user_rcv_skb(skb)) {
if (skb->len)
skb_queue_head(&sk->sk_receive_queue,
skb);
else {
kfree_skb(skb);
qlen--;
}
break;
}
kfree_skb(skb);
}
up(&xfrm_cfg_sem);
} while (qlen);
}
static int build_expire(struct sk_buff *skb, struct xfrm_state *x, int hard)
{
struct xfrm_user_expire *ue;
struct nlmsghdr *nlh;
unsigned char *b = skb->tail;
nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_EXPIRE,
sizeof(*ue));
ue = NLMSG_DATA(nlh);
nlh->nlmsg_flags = 0;
copy_to_user_state(x, &ue->state);
ue->hard = (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_send_state_notify(struct xfrm_state *x, int hard)
{
struct sk_buff *skb;
skb = alloc_skb(sizeof(struct xfrm_user_expire) + 16, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
if (build_expire(skb, x, hard) < 0)
BUG();
NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
}
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;
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));
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_groups = XFRMGRP_ACQUIRE;
return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_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(u16 family, 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 (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;
xp = xfrm_policy_alloc(GFP_KERNEL);
if (xp == NULL) {
*dir = -ENOBUFS;
return NULL;
}
copy_from_user_policy(xp, p);
copy_templates(xp, ut, nr);
*dir = p->dir;
return xp;
}
static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
int dir, int hard)
{
struct xfrm_user_polexpire *upe;
struct nlmsghdr *nlh;
unsigned char *b = skb->tail;
nlh = NLMSG_PUT(skb, 0, 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;
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_send_policy_notify(struct xfrm_policy *xp, int dir, int hard)
{
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));
skb = alloc_skb(len, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
if (build_polexpire(skb, xp, dir, hard) < 0)
BUG();
NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, 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,
};
static int __init xfrm_user_init(void)
{
printk(KERN_INFO "Initializing IPsec netlink socket\n");
xfrm_nl = netlink_kernel_create(NETLINK_XFRM, xfrm_netlink_rcv);
if (xfrm_nl == NULL)
return -ENOMEM;
xfrm_register_km(&netlink_mgr);
return 0;
}
static void __exit xfrm_user_exit(void)
{
xfrm_unregister_km(&netlink_mgr);
sock_release(xfrm_nl->sk_socket);
}
module_init(xfrm_user_init);
module_exit(xfrm_user_exit);
MODULE_LICENSE("GPL");
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