Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1253 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
new file mode 100644
index 000000000000..63661b0fd736
--- /dev/null
+++ b/net/xfrm/xfrm_user.c
@@ -0,0 +1,1253 @@
+/* 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;
+
+        if (!rt)
+                return 0;
+
+        if ((rt->rta_len - sizeof(*rt)) < sizeof(*algp))
+                return -EINVAL;
+
+        algp = RTA_DATA(rt);
+        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;
+
+        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;
+
+        p = kmalloc(sizeof(*ualg) + ualg->alg_key_len, GFP_KERNEL);
+        if (!p)
+                return -ENOMEM;
+
+        memcpy(p, ualg, sizeof(*ualg) + ualg->alg_key_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;
+}
+
+static const int xfrm_msg_min[(XFRM_MSG_MAX + 1 - XFRM_MSG_BASE)] = {
+        NLMSG_LENGTH(sizeof(struct xfrm_usersa_info)),  /* NEW SA */
+        NLMSG_LENGTH(sizeof(struct xfrm_usersa_id)),    /* DEL SA */
+        NLMSG_LENGTH(sizeof(struct xfrm_usersa_id)),    /* GET SA */
+        NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info)),/* NEW POLICY */
+        NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id)),  /* DEL POLICY */
+        NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id)),  /* GET POLICY */
+        NLMSG_LENGTH(sizeof(struct xfrm_userspi_info)), /* ALLOC SPI */
+        NLMSG_LENGTH(sizeof(struct xfrm_user_acquire)), /* ACQUIRE */
+        NLMSG_LENGTH(sizeof(struct xfrm_user_expire)),  /* EXPIRE */
+        NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info)),/* UPD POLICY */
+        NLMSG_LENGTH(sizeof(struct xfrm_usersa_info)),  /* UPD SA */
+        NLMSG_LENGTH(sizeof(struct xfrm_user_polexpire)), /* POLEXPIRE */
+        NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush)), /* FLUSH SA */
+        NLMSG_LENGTH(0),                                /* FLUSH POLICY */
+};
+
+static struct xfrm_link {
+        int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
+        int (*dump)(struct sk_buff *, struct netlink_callback *);
+} xfrm_dispatch[] = {
+        {       .doit   =       xfrm_add_sa,            },
+        {       .doit   =       xfrm_del_sa,            },
+        {
+                .doit   =       xfrm_get_sa,
+                .dump   =       xfrm_dump_sa,
+        },
+        {       .doit   =       xfrm_add_policy         },
+        {       .doit   =       xfrm_get_policy         },
+        {
+                .doit   =       xfrm_get_policy,
+                .dump   =       xfrm_dump_policy,
+        },
+        {       .doit   =       xfrm_alloc_userspi      },
+        {},
+        {},
+        {       .doit   =       xfrm_add_policy         },
+        {       .doit   =       xfrm_add_sa,            },
+        {},
+        {       .doit   =       xfrm_flush_sa           },
+        {       .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 == 2 || type == 5) && (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)
+{
+        do {
+                struct sk_buff *skb;
+
+                down(&xfrm_cfg_sem);
+
+                while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+                        if (xfrm_user_rcv_skb(skb)) {
+                                if (skb->len)
+                                        skb_queue_head(&sk->sk_receive_queue,
+                                                       skb);
+                                else
+                                        kfree_skb(skb);
+                                break;
+                        }
+                        kfree_skb(skb);
+                }
+
+                up(&xfrm_cfg_sem);
+
+        } while (xfrm_nl && xfrm_nl->sk_receive_queue.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");