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xfrm_user.c
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xfrm_user.c
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/* xfrm_user.c: User interface to configure xfrm engine.
*
* Copyright (C) 2002 David S. Miller ([email protected])
*
* Changes:
* Mitsuru KANDA @USAGI
* Kazunori MIYAZAWA @USAGI
* Kunihiro Ishiguro <[email protected]>
* 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/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>
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 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;
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;
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 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 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;
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 int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
struct xfrm_state *x;
int err;
struct km_event c;
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;
}
err = xfrm_state_delete(x);
if (err < 0) {
xfrm_state_put(x);
return err;
}
c.seq = nlh->nlmsg_seq;
c.pid = nlh->nlmsg_pid;
c.event = nlh->nlmsg_type;
km_state_notify(x, &c);
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);
}
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 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 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);
if (!(err = copy_from_user_tmpl(xp, xfrma)))
err = copy_from_user_sec_ctx(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;
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_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
{
if (xp->security) {
int ctx_size = sizeof(struct xfrm_sec_ctx) +
xp->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 = xp->security->ctx_doi;
uctx->ctx_alg = xp->security->ctx_alg;
uctx->ctx_len = xp->security->ctx_len;
memcpy(uctx + 1, xp->security->ctx_str, xp->security->ctx_len);
}
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;
if (copy_to_user_sec_ctx(xp, skb))
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);