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1253 lines
26 KiB
1253 lines
26 KiB
/* xfrm_user.c: User interface to configure xfrm engine.
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*
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* Copyright (C) 2002 David S. Miller (davem@redhat.com)
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*
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* Changes:
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* Mitsuru KANDA @USAGI
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* Kazunori MIYAZAWA @USAGI
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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* IPv6 support
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/socket.h>
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#include <linux/string.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/pfkeyv2.h>
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#include <linux/ipsec.h>
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#include <linux/init.h>
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#include <linux/security.h>
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#include <net/sock.h>
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#include <net/xfrm.h>
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#include <asm/uaccess.h>
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static struct sock *xfrm_nl;
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static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
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{
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struct rtattr *rt = xfrma[type - 1];
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struct xfrm_algo *algp;
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if (!rt)
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return 0;
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if ((rt->rta_len - sizeof(*rt)) < sizeof(*algp))
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return -EINVAL;
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algp = RTA_DATA(rt);
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switch (type) {
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case XFRMA_ALG_AUTH:
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if (!algp->alg_key_len &&
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strcmp(algp->alg_name, "digest_null") != 0)
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return -EINVAL;
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break;
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case XFRMA_ALG_CRYPT:
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if (!algp->alg_key_len &&
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strcmp(algp->alg_name, "cipher_null") != 0)
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return -EINVAL;
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break;
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case XFRMA_ALG_COMP:
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/* Zero length keys are legal. */
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break;
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default:
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return -EINVAL;
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};
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algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
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return 0;
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}
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static int verify_encap_tmpl(struct rtattr **xfrma)
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{
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struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
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struct xfrm_encap_tmpl *encap;
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if (!rt)
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return 0;
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if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
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return -EINVAL;
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return 0;
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}
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static int verify_newsa_info(struct xfrm_usersa_info *p,
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struct rtattr **xfrma)
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{
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int err;
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err = -EINVAL;
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switch (p->family) {
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case AF_INET:
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break;
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case AF_INET6:
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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break;
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#else
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err = -EAFNOSUPPORT;
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goto out;
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#endif
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default:
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goto out;
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};
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err = -EINVAL;
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switch (p->id.proto) {
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case IPPROTO_AH:
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if (!xfrma[XFRMA_ALG_AUTH-1] ||
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xfrma[XFRMA_ALG_CRYPT-1] ||
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xfrma[XFRMA_ALG_COMP-1])
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goto out;
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break;
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case IPPROTO_ESP:
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if ((!xfrma[XFRMA_ALG_AUTH-1] &&
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!xfrma[XFRMA_ALG_CRYPT-1]) ||
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xfrma[XFRMA_ALG_COMP-1])
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goto out;
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break;
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case IPPROTO_COMP:
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if (!xfrma[XFRMA_ALG_COMP-1] ||
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xfrma[XFRMA_ALG_AUTH-1] ||
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xfrma[XFRMA_ALG_CRYPT-1])
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goto out;
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break;
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default:
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goto out;
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};
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if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
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goto out;
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if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
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goto out;
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if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
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goto out;
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if ((err = verify_encap_tmpl(xfrma)))
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goto out;
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err = -EINVAL;
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switch (p->mode) {
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case 0:
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case 1:
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break;
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default:
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goto out;
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};
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err = 0;
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out:
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return err;
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}
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static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
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struct xfrm_algo_desc *(*get_byname)(char *, int),
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struct rtattr *u_arg)
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{
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struct rtattr *rta = u_arg;
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struct xfrm_algo *p, *ualg;
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struct xfrm_algo_desc *algo;
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if (!rta)
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return 0;
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ualg = RTA_DATA(rta);
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algo = get_byname(ualg->alg_name, 1);
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if (!algo)
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return -ENOSYS;
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*props = algo->desc.sadb_alg_id;
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p = kmalloc(sizeof(*ualg) + ualg->alg_key_len, GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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memcpy(p, ualg, sizeof(*ualg) + ualg->alg_key_len);
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*algpp = p;
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return 0;
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}
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static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
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{
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struct rtattr *rta = u_arg;
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struct xfrm_encap_tmpl *p, *uencap;
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if (!rta)
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return 0;
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uencap = RTA_DATA(rta);
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p = kmalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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memcpy(p, uencap, sizeof(*p));
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*encapp = p;
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return 0;
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}
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static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
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{
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memcpy(&x->id, &p->id, sizeof(x->id));
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memcpy(&x->sel, &p->sel, sizeof(x->sel));
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memcpy(&x->lft, &p->lft, sizeof(x->lft));
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x->props.mode = p->mode;
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x->props.replay_window = p->replay_window;
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x->props.reqid = p->reqid;
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x->props.family = p->family;
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x->props.saddr = p->saddr;
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x->props.flags = p->flags;
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}
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static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
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struct rtattr **xfrma,
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int *errp)
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{
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struct xfrm_state *x = xfrm_state_alloc();
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int err = -ENOMEM;
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if (!x)
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goto error_no_put;
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copy_from_user_state(x, p);
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if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
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xfrm_aalg_get_byname,
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xfrma[XFRMA_ALG_AUTH-1])))
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goto error;
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if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
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xfrm_ealg_get_byname,
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xfrma[XFRMA_ALG_CRYPT-1])))
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goto error;
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if ((err = attach_one_algo(&x->calg, &x->props.calgo,
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xfrm_calg_get_byname,
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xfrma[XFRMA_ALG_COMP-1])))
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goto error;
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if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
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goto error;
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err = -ENOENT;
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x->type = xfrm_get_type(x->id.proto, x->props.family);
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if (x->type == NULL)
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goto error;
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err = x->type->init_state(x, NULL);
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if (err)
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goto error;
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x->curlft.add_time = (unsigned long) xtime.tv_sec;
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x->km.state = XFRM_STATE_VALID;
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x->km.seq = p->seq;
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return x;
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error:
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x->km.state = XFRM_STATE_DEAD;
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xfrm_state_put(x);
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error_no_put:
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*errp = err;
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return NULL;
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}
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static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
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{
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struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
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struct xfrm_state *x;
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int err;
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err = verify_newsa_info(p, (struct rtattr **) xfrma);
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if (err)
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return err;
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x = xfrm_state_construct(p, (struct rtattr **) xfrma, &err);
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if (!x)
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return err;
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if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
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err = xfrm_state_add(x);
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else
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err = xfrm_state_update(x);
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if (err < 0) {
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x->km.state = XFRM_STATE_DEAD;
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xfrm_state_put(x);
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}
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return err;
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}
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static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
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{
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struct xfrm_state *x;
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struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
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x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
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if (x == NULL)
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return -ESRCH;
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if (xfrm_state_kern(x)) {
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xfrm_state_put(x);
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return -EPERM;
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}
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xfrm_state_delete(x);
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xfrm_state_put(x);
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return 0;
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}
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static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
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{
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memcpy(&p->id, &x->id, sizeof(p->id));
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memcpy(&p->sel, &x->sel, sizeof(p->sel));
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memcpy(&p->lft, &x->lft, sizeof(p->lft));
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memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
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memcpy(&p->stats, &x->stats, sizeof(p->stats));
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p->saddr = x->props.saddr;
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p->mode = x->props.mode;
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p->replay_window = x->props.replay_window;
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p->reqid = x->props.reqid;
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p->family = x->props.family;
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p->flags = x->props.flags;
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p->seq = x->km.seq;
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}
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struct xfrm_dump_info {
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struct sk_buff *in_skb;
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struct sk_buff *out_skb;
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u32 nlmsg_seq;
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u16 nlmsg_flags;
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int start_idx;
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int this_idx;
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};
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static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
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{
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struct xfrm_dump_info *sp = ptr;
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struct sk_buff *in_skb = sp->in_skb;
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struct sk_buff *skb = sp->out_skb;
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struct xfrm_usersa_info *p;
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struct nlmsghdr *nlh;
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unsigned char *b = skb->tail;
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if (sp->this_idx < sp->start_idx)
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goto out;
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nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
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sp->nlmsg_seq,
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XFRM_MSG_NEWSA, sizeof(*p));
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nlh->nlmsg_flags = sp->nlmsg_flags;
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p = NLMSG_DATA(nlh);
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copy_to_user_state(x, p);
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|
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if (x->aalg)
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RTA_PUT(skb, XFRMA_ALG_AUTH,
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sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
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if (x->ealg)
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RTA_PUT(skb, XFRMA_ALG_CRYPT,
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sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
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if (x->calg)
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RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
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|
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if (x->encap)
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RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
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nlh->nlmsg_len = skb->tail - b;
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out:
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|
sp->this_idx++;
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return 0;
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|
|
nlmsg_failure:
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|
rtattr_failure:
|
|
skb_trim(skb, b - skb->data);
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return -1;
|
|
}
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|
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static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct xfrm_dump_info info;
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|
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info.in_skb = cb->skb;
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info.out_skb = skb;
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info.nlmsg_seq = cb->nlh->nlmsg_seq;
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info.nlmsg_flags = NLM_F_MULTI;
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info.this_idx = 0;
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info.start_idx = cb->args[0];
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(void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info);
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cb->args[0] = info.this_idx;
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return skb->len;
|
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}
|
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|
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static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
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struct xfrm_state *x, u32 seq)
|
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{
|
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struct xfrm_dump_info info;
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struct sk_buff *skb;
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|
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skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
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if (!skb)
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|
return ERR_PTR(-ENOMEM);
|
|
|
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NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
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|
info.in_skb = in_skb;
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info.out_skb = skb;
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info.nlmsg_seq = seq;
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info.nlmsg_flags = 0;
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info.this_idx = info.start_idx = 0;
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|
|
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if (dump_one_state(x, 0, &info)) {
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kfree_skb(skb);
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|
return NULL;
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|
}
|
|
|
|
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");
|
|
|