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Diffstat (limited to 'net/xfrm/xfrm_user.c')
-rw-r--r--net/xfrm/xfrm_user.c1253
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");