/* xfrm_user.c: User interface to configure xfrm engine. * * Copyright (C) 2002 David S. Miller (davem@redhat.com) * * Changes: * Mitsuru KANDA @USAGI * Kazunori MIYAZAWA @USAGI * Kunihiro Ishiguro <kunihiro@ipinfusion.com> * IPv6 support * */ #include <linux/crypto.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/slab.h> #include <linux/socket.h> #include <linux/string.h> #include <linux/net.h> #include <linux/skbuff.h> #include <linux/rtnetlink.h> #include <linux/pfkeyv2.h> #include <linux/ipsec.h> #include <linux/init.h> #include <linux/security.h> #include <net/sock.h> #include <net/xfrm.h> #include <net/netlink.h> #include <asm/uaccess.h> #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) #include <linux/in6.h> #endif static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type) { struct rtattr *rt = xfrma[type - 1]; struct xfrm_algo *algp; int len; if (!rt) return 0; len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp); if (len < 0) return -EINVAL; algp = RTA_DATA(rt); len -= (algp->alg_key_len + 7U) / 8; if (len < 0) return -EINVAL; switch (type) { case XFRMA_ALG_AUTH: if (!algp->alg_key_len && strcmp(algp->alg_name, "digest_null") != 0) return -EINVAL; break; case XFRMA_ALG_CRYPT: if (!algp->alg_key_len && strcmp(algp->alg_name, "cipher_null") != 0) return -EINVAL; break; case XFRMA_ALG_COMP: /* Zero length keys are legal. */ break; default: return -EINVAL; }; algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; return 0; } static int verify_encap_tmpl(struct rtattr **xfrma) { struct rtattr *rt = xfrma[XFRMA_ENCAP - 1]; struct xfrm_encap_tmpl *encap; if (!rt) return 0; if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap)) return -EINVAL; return 0; } static int verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type, xfrm_address_t **addrp) { struct rtattr *rt = xfrma[type - 1]; if (!rt) return 0; if ((rt->rta_len - sizeof(*rt)) < sizeof(**addrp)) return -EINVAL; if (addrp) *addrp = RTA_DATA(rt); return 0; } static inline int verify_sec_ctx_len(struct rtattr **xfrma) { struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1]; struct xfrm_user_sec_ctx *uctx; int len = 0; if (!rt) return 0; if (rt->rta_len < sizeof(*uctx)) return -EINVAL; uctx = RTA_DATA(rt); len += sizeof(struct xfrm_user_sec_ctx); len += uctx->ctx_len; if (uctx->len != len) return -EINVAL; return 0; } static int verify_newsa_info(struct xfrm_usersa_info *p, struct rtattr **xfrma) { int err; err = -EINVAL; switch (p->family) { case AF_INET: break; case AF_INET6: #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) break; #else err = -EAFNOSUPPORT; goto out; #endif default: goto out; }; err = -EINVAL; switch (p->id.proto) { case IPPROTO_AH: if (!xfrma[XFRMA_ALG_AUTH-1] || xfrma[XFRMA_ALG_CRYPT-1] || xfrma[XFRMA_ALG_COMP-1]) goto out; break; case IPPROTO_ESP: if ((!xfrma[XFRMA_ALG_AUTH-1] && !xfrma[XFRMA_ALG_CRYPT-1]) || xfrma[XFRMA_ALG_COMP-1]) goto out; break; case IPPROTO_COMP: if (!xfrma[XFRMA_ALG_COMP-1] || xfrma[XFRMA_ALG_AUTH-1] || xfrma[XFRMA_ALG_CRYPT-1]) goto out; break; #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) case IPPROTO_DSTOPTS: case IPPROTO_ROUTING: if (xfrma[XFRMA_ALG_COMP-1] || xfrma[XFRMA_ALG_AUTH-1] || xfrma[XFRMA_ALG_CRYPT-1] || xfrma[XFRMA_ENCAP-1] || xfrma[XFRMA_SEC_CTX-1] || !xfrma[XFRMA_COADDR-1]) goto out; break; #endif default: goto out; }; if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH))) goto out; if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT))) goto out; if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP))) goto out; if ((err = verify_encap_tmpl(xfrma))) goto out; if ((err = verify_sec_ctx_len(xfrma))) goto out; if ((err = verify_one_addr(xfrma, XFRMA_COADDR, NULL))) goto out; err = -EINVAL; switch (p->mode) { case XFRM_MODE_TRANSPORT: case XFRM_MODE_TUNNEL: case XFRM_MODE_ROUTEOPTIMIZATION: break; default: goto out; }; err = 0; out: return err; } static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, struct xfrm_algo_desc *(*get_byname)(char *, int), struct rtattr *u_arg) { struct rtattr *rta = u_arg; struct xfrm_algo *p, *ualg; struct xfrm_algo_desc *algo; int len; if (!rta) return 0; ualg = RTA_DATA(rta); algo = get_byname(ualg->alg_name, 1); if (!algo) return -ENOSYS; *props = algo->desc.sadb_alg_id; len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8; p = kmalloc(len, GFP_KERNEL); if (!p) return -ENOMEM; memcpy(p, ualg, len); strcpy(p->alg_name, algo->name); *algpp = p; return 0; } static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg) { struct rtattr *rta = u_arg; struct xfrm_encap_tmpl *p, *uencap; if (!rta) return 0; uencap = RTA_DATA(rta); p = kmalloc(sizeof(*p), GFP_KERNEL); if (!p) return -ENOMEM; memcpy(p, uencap, sizeof(*p)); *encapp = p; return 0; } static inline int xfrm_user_sec_ctx_size(struct xfrm_policy *xp) { struct xfrm_sec_ctx *xfrm_ctx = xp->security; int len = 0; if (xfrm_ctx) { len += sizeof(struct xfrm_user_sec_ctx); len += xfrm_ctx->ctx_len; } return len; } static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg) { struct xfrm_user_sec_ctx *uctx; if (!u_arg) return 0; uctx = RTA_DATA(u_arg); return security_xfrm_state_alloc(x, uctx); } static int attach_one_addr(xfrm_address_t **addrpp, struct rtattr *u_arg) { struct rtattr *rta = u_arg; xfrm_address_t *p, *uaddrp; if (!rta) return 0; uaddrp = RTA_DATA(rta); p = kmalloc(sizeof(*p), GFP_KERNEL); if (!p) return -ENOMEM; memcpy(p, uaddrp, sizeof(*p)); *addrpp = 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; } /* * someday when pfkey also has support, we could have the code * somehow made shareable and move it to xfrm_state.c - JHS * */ static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma) { int err = - EINVAL; struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1]; struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1]; struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1]; struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1]; if (rp) { struct xfrm_replay_state *replay; if (RTA_PAYLOAD(rp) < sizeof(*replay)) goto error; replay = RTA_DATA(rp); memcpy(&x->replay, replay, sizeof(*replay)); memcpy(&x->preplay, replay, sizeof(*replay)); } if (lt) { struct xfrm_lifetime_cur *ltime; if (RTA_PAYLOAD(lt) < sizeof(*ltime)) goto error; ltime = RTA_DATA(lt); x->curlft.bytes = ltime->bytes; x->curlft.packets = ltime->packets; x->curlft.add_time = ltime->add_time; x->curlft.use_time = ltime->use_time; } if (et) { if (RTA_PAYLOAD(et) < sizeof(u32)) goto error; x->replay_maxage = *(u32*)RTA_DATA(et); } if (rt) { if (RTA_PAYLOAD(rt) < sizeof(u32)) goto error; x->replay_maxdiff = *(u32*)RTA_DATA(rt); } return 0; error: return err; } static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p, struct rtattr **xfrma, int *errp) { struct xfrm_state *x = xfrm_state_alloc(); int err = -ENOMEM; if (!x) goto error_no_put; copy_from_user_state(x, p); if ((err = attach_one_algo(&x->aalg, &x->props.aalgo, xfrm_aalg_get_byname, xfrma[XFRMA_ALG_AUTH-1]))) goto error; if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, xfrm_ealg_get_byname, xfrma[XFRMA_ALG_CRYPT-1]))) goto error; if ((err = attach_one_algo(&x->calg, &x->props.calgo, xfrm_calg_get_byname, xfrma[XFRMA_ALG_COMP-1]))) goto error; if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1]))) goto error; if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1]))) goto error; err = xfrm_init_state(x); if (err) goto error; if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1]))) goto error; x->km.seq = p->seq; x->replay_maxdiff = sysctl_xfrm_aevent_rseqth; /* sysctl_xfrm_aevent_etime is in 100ms units */ x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M; x->preplay.bitmap = 0; x->preplay.seq = x->replay.seq+x->replay_maxdiff; x->preplay.oseq = x->replay.oseq +x->replay_maxdiff; /* override default values from above */ err = xfrm_update_ae_params(x, (struct rtattr **)xfrma); if (err < 0) goto error; return x; error: x->km.state = XFRM_STATE_DEAD; xfrm_state_put(x); error_no_put: *errp = err; return NULL; } static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) { struct xfrm_usersa_info *p = NLMSG_DATA(nlh); struct xfrm_state *x; int err; struct km_event c; err = verify_newsa_info(p, (struct rtattr **)xfrma); if (err) return err; x = xfrm_state_construct(p, (struct rtattr **)xfrma, &err); if (!x) return err; xfrm_state_hold(x); if (nlh->nlmsg_type == XFRM_MSG_NEWSA) err = xfrm_state_add(x); else err = xfrm_state_update(x); if (err < 0) { x->km.state = XFRM_STATE_DEAD; __xfrm_state_put(x); goto out; } c.seq = nlh->nlmsg_seq; c.pid = nlh->nlmsg_pid; c.event = nlh->nlmsg_type; km_state_notify(x, &c); out: xfrm_state_put(x); return err; } static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p, struct rtattr **xfrma, int *errp) { struct xfrm_state *x = NULL; int err; if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { err = -ESRCH; x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family); } else { xfrm_address_t *saddr = NULL; err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr); if (err) goto out; if (!saddr) { err = -EINVAL; goto out; } x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto, p->family); } out: if (!x && errp) *errp = err; return x; } static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) { struct xfrm_state *x; int err = -ESRCH; struct km_event c; struct xfrm_usersa_id *p = NLMSG_DATA(nlh); x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err); if (x == NULL) return err; if ((err = security_xfrm_state_delete(x)) != 0) goto out; if (xfrm_state_kern(x)) { err = -EPERM; goto out; } err = xfrm_state_delete(x); if (err < 0) goto out; c.seq = nlh->nlmsg_seq; c.pid = nlh->nlmsg_pid; c.event = nlh->nlmsg_type; km_state_notify(x, &c); out: xfrm_state_put(x); return err; } static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) { memcpy(&p->id, &x->id, sizeof(p->id)); memcpy(&p->sel, &x->sel, sizeof(p->sel)); memcpy(&p->lft, &x->lft, sizeof(p->lft)); memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); memcpy(&p->stats, &x->stats, sizeof(p->stats)); p->saddr = x->props.saddr; p->mode = x->props.mode; p->replay_window = x->props.replay_window; p->reqid = x->props.reqid; p->family = x->props.family; p->flags = x->props.flags; p->seq = x->km.seq; } struct xfrm_dump_info { struct sk_buff *in_skb; struct sk_buff *out_skb; u32 nlmsg_seq; u16 nlmsg_flags; int start_idx; int this_idx; }; static int dump_one_state(struct xfrm_state *x, int count, void *ptr) { struct xfrm_dump_info *sp = ptr; struct sk_buff *in_skb = sp->in_skb; struct sk_buff *skb = sp->out_skb; struct xfrm_usersa_info *p; struct nlmsghdr *nlh; unsigned char *b = skb->tail; if (sp->this_idx < sp->start_idx) goto out; nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, XFRM_MSG_NEWSA, sizeof(*p)); nlh->nlmsg_flags = sp->nlmsg_flags; p = NLMSG_DATA(nlh); copy_to_user_state(x, p); if (x->aalg) RTA_PUT(skb, XFRMA_ALG_AUTH, sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg); if (x->ealg) RTA_PUT(skb, XFRMA_ALG_CRYPT, sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg); if (x->calg) RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); if (x->encap) RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); if (x->security) { int ctx_size = sizeof(struct xfrm_sec_ctx) + x->security->ctx_len; struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size); struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); uctx->exttype = XFRMA_SEC_CTX; uctx->len = ctx_size; uctx->ctx_doi = x->security->ctx_doi; uctx->ctx_alg = x->security->ctx_alg; uctx->ctx_len = x->security->ctx_len; memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len); } if (x->coaddr) RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); if (x->lastused) RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused); 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(0, 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 = -ESRCH; x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err); 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_policy_type(__u8 type) { switch (type) { case XFRM_POLICY_TYPE_MAIN: #ifdef CONFIG_XFRM_SUB_POLICY case XFRM_POLICY_TYPE_SUB: #endif break; default: return -EINVAL; }; return 0; } static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) { switch (p->share) { case XFRM_SHARE_ANY: case XFRM_SHARE_SESSION: case XFRM_SHARE_USER: case XFRM_SHARE_UNIQUE: break; default: return -EINVAL; }; switch (p->action) { case XFRM_POLICY_ALLOW: case XFRM_POLICY_BLOCK: break; default: return -EINVAL; }; switch (p->sel.family) { case AF_INET: break; case AF_INET6: #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) break; #else return -EAFNOSUPPORT; #endif default: return -EINVAL; }; return verify_policy_dir(p->dir); } static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma) { struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1]; struct xfrm_user_sec_ctx *uctx; if (!rt) return 0; uctx = RTA_DATA(rt); return security_xfrm_policy_alloc(pol, uctx); } static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, int nr) { int i; xp->xfrm_nr = nr; for (i = 0; i < nr; i++, ut++) { struct xfrm_tmpl *t = &xp->xfrm_vec[i]; memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); memcpy(&t->saddr, &ut->saddr, sizeof(xfrm_address_t)); t->reqid = ut->reqid; t->mode = ut->mode; t->share = ut->share; t->optional = ut->optional; t->aalgos = ut->aalgos; t->ealgos = ut->ealgos; t->calgos = ut->calgos; } } static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma) { struct rtattr *rt = xfrma[XFRMA_TMPL-1]; struct xfrm_user_tmpl *utmpl; int nr; if (!rt) { pol->xfrm_nr = 0; } else { nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl); if (nr > XFRM_MAX_DEPTH) return -EINVAL; copy_templates(pol, RTA_DATA(rt), nr); } return 0; } static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma) { struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1]; struct xfrm_userpolicy_type *upt; __u8 type = XFRM_POLICY_TYPE_MAIN; int err; if (rt) { if (rt->rta_len < sizeof(*upt)) return -EINVAL; upt = RTA_DATA(rt); type = upt->type; } err = verify_policy_type(type); if (err) return err; *tp = type; 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_policy_type(&xp->type, xfrma); if (err) goto error; if (!(err = copy_from_user_tmpl(xp, xfrma))) err = copy_from_user_sec_ctx(xp, xfrma); if (err) goto error; return xp; error: *errp = err; kfree(xp); return NULL; } static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) { struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh); struct xfrm_policy *xp; struct km_event c; int err; int excl; err = verify_newpolicy_info(p); if (err) return err; err = verify_sec_ctx_len((struct rtattr **)xfrma); if (err) return err; xp = xfrm_policy_construct(p, (struct rtattr **)xfrma, &err); if (!xp) return err; /* shouldnt excl be based on nlh flags?? * Aha! this is anti-netlink really i.e more pfkey derived * in netlink excl is a flag and you wouldnt need * a type XFRM_MSG_UPDPOLICY - JHS */ excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; err = xfrm_policy_insert(p->dir, xp, excl); if (err) { security_xfrm_policy_free(xp); kfree(xp); return err; } c.event = nlh->nlmsg_type; c.seq = nlh->nlmsg_seq; c.pid = nlh->nlmsg_pid; km_policy_notify(xp, p->dir, &c); xfrm_pol_put(xp); return 0; } static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) { struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; int i; if (xp->xfrm_nr == 0) return 0; for (i = 0; i < xp->xfrm_nr; i++) { struct xfrm_user_tmpl *up = &vec[i]; struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; memcpy(&up->id, &kp->id, sizeof(up->id)); up->family = xp->family; memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); up->reqid = kp->reqid; up->mode = kp->mode; up->share = kp->share; up->optional = kp->optional; up->aalgos = kp->aalgos; up->ealgos = kp->ealgos; up->calgos = kp->calgos; } RTA_PUT(skb, XFRMA_TMPL, (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr), vec); return 0; rtattr_failure: return -1; } static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) { int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len; struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size); struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); uctx->exttype = XFRMA_SEC_CTX; uctx->len = ctx_size; uctx->ctx_doi = s->ctx_doi; uctx->ctx_alg = s->ctx_alg; uctx->ctx_len = s->ctx_len; memcpy(uctx + 1, s->ctx_str, s->ctx_len); return 0; rtattr_failure: return -1; } static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) { if (x->security) { return copy_sec_ctx(x->security, skb); } return 0; } static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) { if (xp->security) { return copy_sec_ctx(xp->security, skb); } return 0; } #ifdef CONFIG_XFRM_SUB_POLICY static int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb) { struct xfrm_userpolicy_type upt; memset(&upt, 0, sizeof(upt)); upt.type = xp->type; RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); return 0; rtattr_failure: return -1; } #else static inline int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb) { return 0; } #endif static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) { struct xfrm_dump_info *sp = ptr; struct xfrm_userpolicy_info *p; struct sk_buff *in_skb = sp->in_skb; struct sk_buff *skb = sp->out_skb; struct nlmsghdr *nlh; unsigned char *b = skb->tail; if (sp->this_idx < sp->start_idx) goto out; nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, XFRM_MSG_NEWPOLICY, sizeof(*p)); p = NLMSG_DATA(nlh); nlh->nlmsg_flags = sp->nlmsg_flags; copy_to_user_policy(xp, p, dir); if (copy_to_user_tmpl(xp, skb) < 0) goto nlmsg_failure; if (copy_to_user_sec_ctx(xp, skb)) goto nlmsg_failure; if (copy_to_user_policy_type(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(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info); #ifdef CONFIG_XFRM_SUB_POLICY (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info); #endif 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; __u8 type = XFRM_POLICY_TYPE_MAIN; int err; struct km_event c; int delete; p = NLMSG_DATA(nlh); delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma); if (err) return err; err = verify_policy_dir(p->dir); if (err) return err; if (p->index) xp = xfrm_policy_byid(type, p->dir, p->index, delete); else { struct rtattr **rtattrs = (struct rtattr **)xfrma; struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1]; struct xfrm_policy tmp; err = verify_sec_ctx_len(rtattrs); if (err) return err; memset(&tmp, 0, sizeof(struct xfrm_policy)); if (rt) { struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); if ((err = security_xfrm_policy_alloc(&tmp, uctx))) return err; } xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, delete); security_xfrm_policy_free(&tmp); } 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); } } else { if ((err = security_xfrm_policy_delete(xp)) != 0) goto out; c.data.byid = p->index; c.event = nlh->nlmsg_type; c.seq = nlh->nlmsg_seq; c.pid = nlh->nlmsg_pid; km_policy_notify(xp, p->dir, &c); } xfrm_pol_put(xp); out: return err; } static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) { struct km_event c; struct xfrm_usersa_flush *p = NLMSG_DATA(nlh); xfrm_state_flush(p->proto); c.data.proto = p->proto; c.event = nlh->nlmsg_type; c.seq = nlh->nlmsg_seq; c.pid = nlh->nlmsg_pid; km_state_notify(NULL, &c); return 0; } static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) { struct xfrm_aevent_id *id; struct nlmsghdr *nlh; struct xfrm_lifetime_cur ltime; unsigned char *b = skb->tail; nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id)); id = NLMSG_DATA(nlh); nlh->nlmsg_flags = 0; id->sa_id.daddr = x->id.daddr; id->sa_id.spi = x->id.spi; id->sa_id.family = x->props.family; id->sa_id.proto = x->id.proto; id->flags = c->data.aevent; RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay); ltime.bytes = x->curlft.bytes; ltime.packets = x->curlft.packets; ltime.add_time = x->curlft.add_time; ltime.use_time = x->curlft.use_time; RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), <ime); if (id->flags&XFRM_AE_RTHR) { RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff); } if (id->flags&XFRM_AE_ETHR) { u32 etimer = x->replay_maxage*10/HZ; RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer); } nlh->nlmsg_len = skb->tail - b; return skb->len; rtattr_failure: nlmsg_failure: skb_trim(skb, b - skb->data); return -1; } static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) { struct xfrm_state *x; struct sk_buff *r_skb; int err; struct km_event c; struct xfrm_aevent_id *p = NLMSG_DATA(nlh); int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id)); struct xfrm_usersa_id *id = &p->sa_id; len += RTA_SPACE(sizeof(struct xfrm_replay_state)); len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur)); if (p->flags&XFRM_AE_RTHR) len+=RTA_SPACE(sizeof(u32)); if (p->flags&XFRM_AE_ETHR) len+=RTA_SPACE(sizeof(u32)); r_skb = alloc_skb(len, GFP_ATOMIC); if (r_skb == NULL) return -ENOMEM; x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family); if (x == NULL) { kfree(r_skb); return -ESRCH; } /* * XXX: is this lock really needed - none of the other * gets lock (the concern is things getting updated * while we are still reading) - jhs */ spin_lock_bh(&x->lock); c.data.aevent = p->flags; c.seq = nlh->nlmsg_seq; c.pid = nlh->nlmsg_pid; if (build_aevent(r_skb, x, &c) < 0) BUG(); err = netlink_unicast(xfrm_nl, r_skb, NETLINK_CB(skb).pid, MSG_DONTWAIT); spin_unlock_bh(&x->lock); xfrm_state_put(x); return err; } static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) { struct xfrm_state *x; struct km_event c; int err = - EINVAL; struct xfrm_aevent_id *p = NLMSG_DATA(nlh); struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1]; struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1]; if (!lt && !rp) return err; /* pedantic mode - thou shalt sayeth replaceth */ if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) return err; x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); if (x == NULL) return -ESRCH; if (x->km.state != XFRM_STATE_VALID) goto out; spin_lock_bh(&x->lock); err = xfrm_update_ae_params(x,(struct rtattr **)xfrma); spin_unlock_bh(&x->lock); if (err < 0) goto out; c.event = nlh->nlmsg_type; c.seq = nlh->nlmsg_seq; c.pid = nlh->nlmsg_pid; c.data.aevent = XFRM_AE_CU; km_state_notify(x, &c); err = 0; out: xfrm_state_put(x); return err; } static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) { struct km_event c; __u8 type = XFRM_POLICY_TYPE_MAIN; int err; err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma); if (err) return err; xfrm_policy_flush(type); c.data.type = type; c.event = nlh->nlmsg_type; c.seq = nlh->nlmsg_seq; c.pid = nlh->nlmsg_pid; km_policy_notify(NULL, 0, &c); return 0; } static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) { struct xfrm_policy *xp; struct xfrm_user_polexpire *up = NLMSG_DATA(nlh); struct xfrm_userpolicy_info *p = &up->pol; __u8 type = XFRM_POLICY_TYPE_MAIN; int err = -ENOENT; err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma); if (err) return err; if (p->index) xp = xfrm_policy_byid(type, p->dir, p->index, 0); else { struct rtattr **rtattrs = (struct rtattr **)xfrma; struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1]; struct xfrm_policy tmp; err = verify_sec_ctx_len(rtattrs); if (err) return err; memset(&tmp, 0, sizeof(struct xfrm_policy)); if (rt) { struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); if ((err = security_xfrm_policy_alloc(&tmp, uctx))) return err; } xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, 0); security_xfrm_policy_free(&tmp); } if (xp == NULL) return err; read_lock(&xp->lock); if (xp->dead) { read_unlock(&xp->lock); goto out; } read_unlock(&xp->lock); err = 0; if (up->hard) { xfrm_policy_delete(xp, p->dir); } else { // reset the timers here? printk("Dont know what to do with soft policy expire\n"); } km_policy_expired(xp, p->dir, up->hard, current->pid); out: xfrm_pol_put(xp); return err; } static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) { struct xfrm_state *x; int err; struct xfrm_user_expire *ue = NLMSG_DATA(nlh); struct xfrm_usersa_info *p = &ue->state; x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family); err = -ENOENT; if (x == NULL) return err; err = -EINVAL; spin_lock_bh(&x->lock); if (x->km.state != XFRM_STATE_VALID) goto out; km_state_expired(x, ue->hard, current->pid); if (ue->hard) __xfrm_state_delete(x); out: spin_unlock_bh(&x->lock); xfrm_state_put(x); return err; } static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) { struct xfrm_policy *xp; struct xfrm_user_tmpl *ut; int i; struct rtattr *rt = xfrma[XFRMA_TMPL-1]; struct xfrm_user_acquire *ua = NLMSG_DATA(nlh); struct xfrm_state *x = xfrm_state_alloc(); int err = -ENOMEM; if (!x) return err; err = verify_newpolicy_info(&ua->policy); if (err) { printk("BAD policy passed\n"); kfree(x); return err; } /* build an XP */ xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err); if (!xp) { kfree(x); return err; } memcpy(&x->id, &ua->id, sizeof(ua->id)); memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); ut = RTA_DATA(rt); /* extract the templates and for each call km_key */ for (i = 0; i < xp->xfrm_nr; i++, ut++) { struct xfrm_tmpl *t = &xp->xfrm_vec[i]; memcpy(&x->id, &t->id, sizeof(x->id)); x->props.mode = t->mode; x->props.reqid = t->reqid; x->props.family = ut->family; t->aalgos = ua->aalgos; t->ealgos = ua->ealgos; t->calgos = ua->calgos; err = km_query(x, t, xp); } kfree(x); kfree(xp); return 0; } #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type)) static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0), [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), }; #undef XMSGSIZE static struct xfrm_link { int (*doit)(struct sk_buff *, struct nlmsghdr *, void **); int (*dump)(struct sk_buff *, struct netlink_callback *); } xfrm_dispatch[XFRM_NR_MSGTYPES] = { [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, .dump = xfrm_dump_sa }, [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, .dump = xfrm_dump_policy }, [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, }; 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, CAP_NET_ADMIN)) { *errp = -EPERM; return -1; } if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && (nlh->nlmsg_flags & NLM_F_DUMP)) { if (link->dump == NULL) goto err_einval; if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL)) != 0) { return -1; } netlink_queue_skip(nlh, skb); 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 void xfrm_netlink_rcv(struct sock *sk, int len) { unsigned int qlen = 0; do { mutex_lock(&xfrm_cfg_mutex); netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg); mutex_unlock(&xfrm_cfg_mutex); } while (qlen); } static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) { struct xfrm_user_expire *ue; struct nlmsghdr *nlh; unsigned char *b = skb->tail; nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue)); ue = NLMSG_DATA(nlh); nlh->nlmsg_flags = 0; copy_to_user_state(x, &ue->state); ue->hard = (c->data.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_exp_state_notify(struct xfrm_state *x, struct km_event *c) { struct sk_buff *skb; int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire)); skb = alloc_skb(len, GFP_ATOMIC); if (skb == NULL) return -ENOMEM; if (build_expire(skb, x, c) < 0) BUG(); NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE; return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); } static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c) { struct sk_buff *skb; int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id)); len += RTA_SPACE(sizeof(struct xfrm_replay_state)); len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur)); skb = alloc_skb(len, GFP_ATOMIC); if (skb == NULL) return -ENOMEM; if (build_aevent(skb, x, c) < 0) BUG(); NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS; return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); } static int xfrm_notify_sa_flush(struct km_event *c) { struct xfrm_usersa_flush *p; struct nlmsghdr *nlh; struct sk_buff *skb; unsigned char *b; int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush)); skb = alloc_skb(len, GFP_ATOMIC); if (skb == NULL) return -ENOMEM; b = skb->tail; nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p)); nlh->nlmsg_flags = 0; p = NLMSG_DATA(nlh); p->proto = c->data.proto; nlh->nlmsg_len = skb->tail - b; NETLINK_CB(skb).dst_group = XFRMNLGRP_SA; return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); nlmsg_failure: kfree_skb(skb); return -1; } static int inline xfrm_sa_len(struct xfrm_state *x) { int l = 0; if (x->aalg) l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8); if (x->ealg) l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8); if (x->calg) l += RTA_SPACE(sizeof(*x->calg)); if (x->encap) l += RTA_SPACE(sizeof(*x->encap)); return l; } static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c) { struct xfrm_usersa_info *p; struct xfrm_usersa_id *id; struct nlmsghdr *nlh; struct sk_buff *skb; unsigned char *b; int len = xfrm_sa_len(x); int headlen; headlen = sizeof(*p); if (c->event == XFRM_MSG_DELSA) { len += RTA_SPACE(headlen); headlen = sizeof(*id); } len += NLMSG_SPACE(headlen); skb = alloc_skb(len, GFP_ATOMIC); if (skb == NULL) return -ENOMEM; b = skb->tail; nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen); nlh->nlmsg_flags = 0; p = NLMSG_DATA(nlh); if (c->event == XFRM_MSG_DELSA) { id = NLMSG_DATA(nlh); memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); id->spi = x->id.spi; id->family = x->props.family; id->proto = x->id.proto; p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p))); } 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; NETLINK_CB(skb).dst_group = XFRMNLGRP_SA; return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); nlmsg_failure: rtattr_failure: kfree_skb(skb); return -1; } static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c) { switch (c->event) { case XFRM_MSG_EXPIRE: return xfrm_exp_state_notify(x, c); case XFRM_MSG_NEWAE: return xfrm_aevent_state_notify(x, c); case XFRM_MSG_DELSA: case XFRM_MSG_UPDSA: case XFRM_MSG_NEWSA: return xfrm_notify_sa(x, c); case XFRM_MSG_FLUSHSA: return xfrm_notify_sa_flush(c); default: printk("xfrm_user: Unknown SA event %d\n", c->event); break; } return 0; } 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; if (copy_to_user_state_sec_ctx(x, skb)) goto nlmsg_failure; if (copy_to_user_policy_type(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)); len += RTA_SPACE(xfrm_user_sec_ctx_size(xp)); 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_group = XFRMNLGRP_ACQUIRE; return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_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(struct sock *sk, 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 (sk->sk_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; if (p->dir > XFRM_POLICY_OUT) return NULL; xp = xfrm_policy_alloc(GFP_KERNEL); if (xp == NULL) { *dir = -ENOBUFS; return NULL; } copy_from_user_policy(xp, p); xp->type = XFRM_POLICY_TYPE_MAIN; copy_templates(xp, ut, nr); if (!xp->security) { int err = security_xfrm_sock_policy_alloc(xp, sk); if (err) { kfree(xp); *dir = err; return NULL; } } *dir = p->dir; return xp; } static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, int dir, struct km_event *c) { struct xfrm_user_polexpire *upe; struct nlmsghdr *nlh; int hard = c->data.hard; unsigned char *b = skb->tail; nlh = NLMSG_PUT(skb, c->pid, 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; if (copy_to_user_sec_ctx(xp, skb)) goto nlmsg_failure; if (copy_to_user_policy_type(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_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) { 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)); len += RTA_SPACE(xfrm_user_sec_ctx_size(xp)); skb = alloc_skb(len, GFP_ATOMIC); if (skb == NULL) return -ENOMEM; if (build_polexpire(skb, xp, dir, c) < 0) BUG(); NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE; return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); } static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) { struct xfrm_userpolicy_info *p; struct xfrm_userpolicy_id *id; struct nlmsghdr *nlh; struct sk_buff *skb; unsigned char *b; int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); int headlen; headlen = sizeof(*p); if (c->event == XFRM_MSG_DELPOLICY) { len += RTA_SPACE(headlen); headlen = sizeof(*id); } len += NLMSG_SPACE(headlen); skb = alloc_skb(len, GFP_ATOMIC); if (skb == NULL) return -ENOMEM; b = skb->tail; nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen); p = NLMSG_DATA(nlh); if (c->event == XFRM_MSG_DELPOLICY) { id = NLMSG_DATA(nlh); memset(id, 0, sizeof(*id)); id->dir = dir; if (c->data.byid) id->index = xp->index; else memcpy(&id->sel, &xp->selector, sizeof(id->sel)); p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p))); } nlh->nlmsg_flags = 0; copy_to_user_policy(xp, p, dir); if (copy_to_user_tmpl(xp, skb) < 0) goto nlmsg_failure; if (copy_to_user_policy_type(xp, skb) < 0) goto nlmsg_failure; nlh->nlmsg_len = skb->tail - b; NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY; return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); nlmsg_failure: rtattr_failure: kfree_skb(skb); return -1; } static int xfrm_notify_policy_flush(struct km_event *c) { struct nlmsghdr *nlh; struct sk_buff *skb; unsigned char *b; #ifdef CONFIG_XFRM_SUB_POLICY struct xfrm_userpolicy_type upt; #endif int len = NLMSG_LENGTH(0); skb = alloc_skb(len, GFP_ATOMIC); if (skb == NULL) return -ENOMEM; b = skb->tail; nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0); nlh->nlmsg_flags = 0; #ifdef CONFIG_XFRM_SUB_POLICY memset(&upt, 0, sizeof(upt)); upt.type = c->data.type; RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); #endif nlh->nlmsg_len = skb->tail - b; NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY; return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); nlmsg_failure: #ifdef CONFIG_XFRM_SUB_POLICY rtattr_failure: #endif kfree_skb(skb); return -1; } static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) { switch (c->event) { case XFRM_MSG_NEWPOLICY: case XFRM_MSG_UPDPOLICY: case XFRM_MSG_DELPOLICY: return xfrm_notify_policy(xp, dir, c); case XFRM_MSG_FLUSHPOLICY: return xfrm_notify_policy_flush(c); case XFRM_MSG_POLEXPIRE: return xfrm_exp_policy_notify(xp, dir, c); default: printk("xfrm_user: Unknown Policy event %d\n", c->event); } return 0; } static int build_report(struct sk_buff *skb, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) { struct xfrm_user_report *ur; struct nlmsghdr *nlh; unsigned char *b = skb->tail; nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur)); ur = NLMSG_DATA(nlh); nlh->nlmsg_flags = 0; ur->proto = proto; memcpy(&ur->sel, sel, sizeof(ur->sel)); if (addr) RTA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr); nlh->nlmsg_len = skb->tail - b; return skb->len; nlmsg_failure: rtattr_failure: skb_trim(skb, b - skb->data); return -1; } static int xfrm_send_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) { struct sk_buff *skb; size_t len; len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report))); skb = alloc_skb(len, GFP_ATOMIC); if (skb == NULL) return -ENOMEM; if (build_report(skb, proto, sel, addr) < 0) BUG(); NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT; return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, 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, .report = xfrm_send_report, }; static int __init xfrm_user_init(void) { struct sock *nlsk; printk(KERN_INFO "Initializing XFRM netlink socket\n"); nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX, xfrm_netlink_rcv, THIS_MODULE); if (nlsk == NULL) return -ENOMEM; rcu_assign_pointer(xfrm_nl, nlsk); xfrm_register_km(&netlink_mgr); return 0; } static void __exit xfrm_user_exit(void) { struct sock *nlsk = xfrm_nl; xfrm_unregister_km(&netlink_mgr); rcu_assign_pointer(xfrm_nl, NULL); synchronize_rcu(); sock_release(nlsk->sk_socket); } module_init(xfrm_user_init); module_exit(xfrm_user_exit); MODULE_LICENSE("GPL"); MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);