/* xfrm_user.c: User interface to configure xfrm engine.
*
* Copyright (C) 2002 David S. Miller (davem@redhat.com)
*
* Changes:
* Mitsuru KANDA @USAGI
* Kazunori MIYAZAWA @USAGI
* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
* IPv6 support
*
*/
#include <linux/crypto.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
#include <linux/init.h>
#include <linux/security.h>
#include <net/sock.h>
#include <net/xfrm.h>
#include <net/netlink.h>
#include <asm/uaccess.h>
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
#include <linux/in6.h>
#endif
static inline int aead_len(struct xfrm_algo_aead *alg)
{
return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
}
static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
{
struct nlattr *rt = attrs[type];
struct xfrm_algo *algp;
if (!rt)
return 0;
algp = nla_data(rt);
if (nla_len(rt) < xfrm_alg_len(algp))
return -EINVAL;
switch (type) {
case XFRMA_ALG_AUTH:
case XFRMA_ALG_CRYPT:
case XFRMA_ALG_COMP:
break;
default:
return -EINVAL;
}
algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
return 0;
}
static int verify_aead(struct nlattr **attrs)
{
struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
struct xfrm_algo_aead *algp;
if (!rt)
return 0;
algp = nla_data(rt);
if (nla_len(rt) < aead_len(algp))
return -EINVAL;
algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
return 0;
}
static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
xfrm_address_t **addrp)
{
struct nlattr *rt = attrs[type];
if (rt && addrp)
*addrp = nla_data(rt);
}
static inline int verify_sec_ctx_len(struct nlattr **attrs)
{
struct nlattr *rt = attrs[XFRMA_SEC_CTX];
struct xfrm_user_sec_ctx *uctx;
if (!rt)
return 0;
uctx = nla_data(rt);
if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
return -EINVAL;
return 0;
}
static int verify_newsa_info(struct xfrm_usersa_info *p,
struct nlattr **attrs)
{
int err;
err = -EINVAL;
switch (p->family) {
case AF_INET:
break;
case AF_INET6:
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
break;
#else
err = -EAFNOSUPPORT;
goto out;
#endif
default:
goto out;
}
err = -EINVAL;
switch (p->id.proto) {
case IPPROTO_AH:
if (!attrs[XFRMA_ALG_AUTH] ||
attrs[XFRMA_ALG_AEAD] ||
attrs[XFRMA_ALG_CRYPT] ||
attrs[XFRMA_ALG_COMP])
goto out;
break;
case IPPROTO_ESP:
if (attrs[XFRMA_ALG_COMP])
goto out;
if (!attrs[XFRMA_ALG_AUTH] &&
!attrs[XFRMA_ALG_CRYPT] &&
!attrs[XFRMA_ALG_AEAD])
goto out;
if ((attrs[XFRMA_ALG_AUTH] ||
attrs[XFRMA_ALG_CRYPT]) &&
attrs[XFRMA_ALG_AEAD])
goto out;
break;
case IPPROTO_COMP:
if (!attrs[XFRMA_ALG_COMP] ||
attrs[XFRMA_ALG_AEAD] ||
attrs[XFRMA_ALG_AUTH] ||
attrs[XFRMA_ALG_CRYPT])
goto out;
break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case IPPROTO_DSTOPTS:
case IPPROTO_ROUTING:
if (attrs[XFRMA_ALG_COMP] ||
attrs[XFRMA_ALG_AUTH] ||
attrs[XFRMA_ALG_AEAD] ||
attrs[XFRMA_ALG_CRYPT] ||
attrs[XFRMA_ENCAP] ||
attrs[XFRMA_SEC_CTX] ||
!attrs[XFRMA_COADDR])
goto out;
break;
#endif
default:
goto out;
}
if ((err = verify_aead(attrs)))
goto out;
if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
goto out;
if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
goto out;
if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
goto out;
if ((err = verify_sec_ctx_len(attrs)))
goto out;
err = -EINVAL;
switch (p->mode) {
case XFRM_MODE_TRANSPORT:
case XFRM_MODE_TUNNEL:
case XFRM_MODE_ROUTEOPTIMIZATION:
case XFRM_MODE_BEET:
break;
default:
goto out;
}
err = 0;
out:
return err;
}
static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
struct xfrm_algo_desc *(*get_byname)(char *, int),
struct nlattr *rta)
{
struct xfrm_algo *p, *ualg;
struct xfrm_algo_desc *algo;
if (!rta)
return 0;
ualg = nla_data(rta);
algo = get_byname(ualg->alg_name, 1);
if (!algo)
return -ENOSYS;
*props = algo->desc.sadb_alg_id;
p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
if (!p)
return -ENOMEM;
strcpy(p->alg_name, algo->name);
*algpp = p;
return 0;
}
static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
struct nlattr *rta)
{
struct xfrm_algo_aead *p, *ualg;
struct xfrm_algo_desc *algo;
if (!rta)
return 0;
ualg = nla_data(rta);
algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
if (!algo)
return -ENOSYS;
*props = algo->desc.sadb_alg_id;
p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
if (!p)
return -ENOMEM;
strcpy(p->alg_name, algo->name);
*algpp = p;
return 0;
}
static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
{
int len = 0;
if (xfrm_ctx) {
len += sizeof(struct xfrm_user_sec_ctx);
len += xfrm_ctx->ctx_len;
}
return len;
}
static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
{
memcpy(&x->id, &p->id, sizeof(x->id));
memcpy(&x->sel, &p->sel, sizeof(x->sel));
memcpy(&x->lft, &p->lft, sizeof(x->lft));
x->props.mode = p->mode;
x->props.replay_window = p->replay_window;
x->props.reqid = p->reqid;
x->props.family = p->family;
memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
x->props.flags = p->flags;
if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
x->sel.family = p->family;
}
/*
* someday when pfkey also has support, we could have the code
* somehow made shareable and move it to xfrm_state.c - JHS
*
*/
static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
{
struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
if (rp) {
struct xfrm_replay_state *replay;
replay = nla_data(rp);
memcpy(&x->replay, replay, sizeof(*replay));
memcpy(&x->preplay, replay, sizeof(*replay));
}
if (lt) {
struct xfrm_lifetime_cur *ltime;
ltime = nla_data(lt);
x->curlft.bytes = ltime->bytes;
x->curlft.packets = ltime->packets;
x->curlft.add_time = ltime->add_time;
x->curlft.use_time = ltime->use_time;
}
if (et)
x->replay_maxage = nla_get_u32(et);
if (rt)
x->replay_maxdiff = nla_get_u32(rt);
}
static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
struct nlattr **attrs,
int *errp)
{
struct xfrm_state *x = xfrm_state_alloc();
int err = -ENOMEM;
if (!x)
goto error_no_put;
copy_from_user_state(x, p);
if ((err = attach_aead(&x->aead, &x->props.ealgo,
attrs[XFRMA_ALG_AEAD])))
goto error;
if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
xfrm_aalg_get_byname,
attrs[XFRMA_ALG_AUTH])))
goto error;
if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
xfrm_ealg_get_byname,
attrs[XFRMA_ALG_CRYPT])))
goto error;
if ((err = attach_one_algo(&x->calg, &x->props.calgo,
xfrm_calg_get_byname,
attrs[XFRMA_ALG_COMP])))
goto error;
if (attrs[XFRMA_ENCAP]) {
x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
sizeof(*x->encap), GFP_KERNEL);
if (x->encap == NULL)
goto error;
}
if (attrs[XFRMA_COADDR]) {
x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
sizeof(*x->coaddr), GFP_KERNEL);
if (x->coaddr == NULL)
goto error;
}
err = xfrm_init_state(x);
if (err)
goto error;
if (attrs[XFRMA_SEC_CTX] &&
security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
goto error;
x->km.seq = p->seq;
x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
/* sysctl_xfrm_aevent_etime is in 100ms units */
x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
x->preplay.bitmap = 0;
x->preplay.seq = x->replay.seq+x->replay_maxdiff;
x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
/* override default values from above */
xfrm_update_ae_params(x, attrs);
return x;
error:
x->km.state = XFRM_STATE_DEAD;
xfrm_state_put(x);
error_no_put:
*errp = err;
return NULL;
}
static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr **attrs)
{
struct xfrm_usersa_info *p = nlmsg_data(nlh);
struct xfrm_state *x;
int err;
struct km_event c;
uid_t loginuid = NETLINK_CB(skb).loginuid;
u32 sessionid = NETLINK_CB(skb).sessionid;
u32 sid = NETLINK_CB(skb).sid;
err = verify_newsa_info(p, attrs);
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