| /* 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/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 <net/ah.h> |
| #include <linux/uaccess.h> |
| #if IS_ENABLED(CONFIG_IPV6) |
| #include <linux/in6.h> |
| #endif |
| #include <asm/unaligned.h> |
| |
| static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) |
| { |
| struct nlattr *rt = attrs[type]; |
| struct xfrm_algo *algp; |
| |
| if (!rt) |
| return 0; |
| |
| algp = nla_data(rt); |
| if (nla_len(rt) < (int)xfrm_alg_len(algp)) |
| return -EINVAL; |
| |
| switch (type) { |
| case XFRMA_ALG_AUTH: |
| case XFRMA_ALG_CRYPT: |
| case XFRMA_ALG_COMP: |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| |
| algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; |
| return 0; |
| } |
| |
| static int verify_auth_trunc(struct nlattr **attrs) |
| { |
| struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; |
| struct xfrm_algo_auth *algp; |
| |
| if (!rt) |
| return 0; |
| |
| algp = nla_data(rt); |
| if (nla_len(rt) < (int)xfrm_alg_auth_len(algp)) |
| return -EINVAL; |
| |
| algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; |
| return 0; |
| } |
| |
| static int verify_aead(struct nlattr **attrs) |
| { |
| struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; |
| struct xfrm_algo_aead *algp; |
| |
| if (!rt) |
| return 0; |
| |
| algp = nla_data(rt); |
| if (nla_len(rt) < (int)aead_len(algp)) |
| return -EINVAL; |
| |
| algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; |
| return 0; |
| } |
| |
| static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, |
| xfrm_address_t **addrp) |
| { |
| struct nlattr *rt = attrs[type]; |
| |
| if (rt && addrp) |
| *addrp = nla_data(rt); |
| } |
| |
| static inline int verify_sec_ctx_len(struct nlattr **attrs) |
| { |
| struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
| struct xfrm_user_sec_ctx *uctx; |
| |
| if (!rt) |
| return 0; |
| |
| uctx = nla_data(rt); |
| if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static inline int verify_replay(struct xfrm_usersa_info *p, |
| struct nlattr **attrs) |
| { |
| struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; |
| struct xfrm_replay_state_esn *rs; |
| |
| if (!rt) |
| return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0; |
| |
| rs = nla_data(rt); |
| |
| if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) |
| return -EINVAL; |
| |
| if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) && |
| nla_len(rt) != sizeof(*rs)) |
| return -EINVAL; |
| |
| /* As only ESP and AH support ESN feature. */ |
| if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) |
| return -EINVAL; |
| |
| if (p->replay_window != 0) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int verify_newsa_info(struct xfrm_usersa_info *p, |
| struct nlattr **attrs) |
| { |
| int err; |
| |
| err = -EINVAL; |
| switch (p->family) { |
| case AF_INET: |
| if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) |
| goto out; |
| |
| break; |
| |
| case AF_INET6: |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) |
| goto out; |
| |
| break; |
| #else |
| err = -EAFNOSUPPORT; |
| goto out; |
| #endif |
| |
| default: |
| goto out; |
| } |
| |
| err = -EINVAL; |
| switch (p->id.proto) { |
| case IPPROTO_AH: |
| if ((!attrs[XFRMA_ALG_AUTH] && |
| !attrs[XFRMA_ALG_AUTH_TRUNC]) || |
| attrs[XFRMA_ALG_AEAD] || |
| attrs[XFRMA_ALG_CRYPT] || |
| attrs[XFRMA_ALG_COMP] || |
| attrs[XFRMA_TFCPAD]) |
| goto out; |
| break; |
| |
| case IPPROTO_ESP: |
| if (attrs[XFRMA_ALG_COMP]) |
| goto out; |
| if (!attrs[XFRMA_ALG_AUTH] && |
| !attrs[XFRMA_ALG_AUTH_TRUNC] && |
| !attrs[XFRMA_ALG_CRYPT] && |
| !attrs[XFRMA_ALG_AEAD]) |
| goto out; |
| if ((attrs[XFRMA_ALG_AUTH] || |
| attrs[XFRMA_ALG_AUTH_TRUNC] || |
| attrs[XFRMA_ALG_CRYPT]) && |
| attrs[XFRMA_ALG_AEAD]) |
| goto out; |
| if (attrs[XFRMA_TFCPAD] && |
| p->mode != XFRM_MODE_TUNNEL) |
| goto out; |
| break; |
| |
| case IPPROTO_COMP: |
| if (!attrs[XFRMA_ALG_COMP] || |
| attrs[XFRMA_ALG_AEAD] || |
| attrs[XFRMA_ALG_AUTH] || |
| attrs[XFRMA_ALG_AUTH_TRUNC] || |
| attrs[XFRMA_ALG_CRYPT] || |
| attrs[XFRMA_TFCPAD] || |
| (ntohl(p->id.spi) >= 0x10000)) |
| goto out; |
| break; |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| case IPPROTO_DSTOPTS: |
| case IPPROTO_ROUTING: |
| if (attrs[XFRMA_ALG_COMP] || |
| attrs[XFRMA_ALG_AUTH] || |
| attrs[XFRMA_ALG_AUTH_TRUNC] || |
| attrs[XFRMA_ALG_AEAD] || |
| attrs[XFRMA_ALG_CRYPT] || |
| attrs[XFRMA_ENCAP] || |
| attrs[XFRMA_SEC_CTX] || |
| attrs[XFRMA_TFCPAD] || |
| !attrs[XFRMA_COADDR]) |
| goto out; |
| break; |
| #endif |
| |
| default: |
| goto out; |
| } |
| |
| if ((err = verify_aead(attrs))) |
| goto out; |
| if ((err = verify_auth_trunc(attrs))) |
| goto out; |
| if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) |
| goto out; |
| if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) |
| goto out; |
| if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) |
| goto out; |
| if ((err = verify_sec_ctx_len(attrs))) |
| goto out; |
| if ((err = verify_replay(p, attrs))) |
| goto out; |
| |
| err = -EINVAL; |
| switch (p->mode) { |
| case XFRM_MODE_TRANSPORT: |
| case XFRM_MODE_TUNNEL: |
| case XFRM_MODE_ROUTEOPTIMIZATION: |
| case XFRM_MODE_BEET: |
| 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)(const char *, int), |
| struct nlattr *rta) |
| { |
| struct xfrm_algo *p, *ualg; |
| struct xfrm_algo_desc *algo; |
| |
| if (!rta) |
| return 0; |
| |
| ualg = nla_data(rta); |
| |
| algo = get_byname(ualg->alg_name, 1); |
| if (!algo) |
| return -ENOSYS; |
| *props = algo->desc.sadb_alg_id; |
| |
| p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); |
| if (!p) |
| return -ENOMEM; |
| |
| strcpy(p->alg_name, algo->name); |
| *algpp = p; |
| return 0; |
| } |
| |
| static int attach_crypt(struct xfrm_state *x, struct nlattr *rta) |
| { |
| struct xfrm_algo *p, *ualg; |
| struct xfrm_algo_desc *algo; |
| |
| if (!rta) |
| return 0; |
| |
| ualg = nla_data(rta); |
| |
| algo = xfrm_ealg_get_byname(ualg->alg_name, 1); |
| if (!algo) |
| return -ENOSYS; |
| x->props.ealgo = algo->desc.sadb_alg_id; |
| |
| p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); |
| if (!p) |
| return -ENOMEM; |
| |
| strcpy(p->alg_name, algo->name); |
| x->ealg = p; |
| x->geniv = algo->uinfo.encr.geniv; |
| return 0; |
| } |
| |
| static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, |
| struct nlattr *rta) |
| { |
| struct xfrm_algo *ualg; |
| struct xfrm_algo_auth *p; |
| struct xfrm_algo_desc *algo; |
| |
| if (!rta) |
| return 0; |
| |
| ualg = nla_data(rta); |
| |
| algo = xfrm_aalg_get_byname(ualg->alg_name, 1); |
| if (!algo) |
| return -ENOSYS; |
| *props = algo->desc.sadb_alg_id; |
| |
| p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); |
| if (!p) |
| return -ENOMEM; |
| |
| strcpy(p->alg_name, algo->name); |
| p->alg_key_len = ualg->alg_key_len; |
| p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; |
| memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); |
| |
| *algpp = p; |
| return 0; |
| } |
| |
| static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, |
| struct nlattr *rta) |
| { |
| struct xfrm_algo_auth *p, *ualg; |
| struct xfrm_algo_desc *algo; |
| |
| if (!rta) |
| return 0; |
| |
| ualg = nla_data(rta); |
| |
| algo = xfrm_aalg_get_byname(ualg->alg_name, 1); |
| if (!algo) |
| return -ENOSYS; |
| if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) |
| return -EINVAL; |
| *props = algo->desc.sadb_alg_id; |
| |
| p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); |
| if (!p) |
| return -ENOMEM; |
| |
| strcpy(p->alg_name, algo->name); |
| if (!p->alg_trunc_len) |
| p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; |
| |
| *algpp = p; |
| return 0; |
| } |
| |
| static int attach_aead(struct xfrm_state *x, struct nlattr *rta) |
| { |
| struct xfrm_algo_aead *p, *ualg; |
| struct xfrm_algo_desc *algo; |
| |
| if (!rta) |
| return 0; |
| |
| ualg = nla_data(rta); |
| |
| algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); |
| if (!algo) |
| return -ENOSYS; |
| x->props.ealgo = algo->desc.sadb_alg_id; |
| |
| p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); |
| if (!p) |
| return -ENOMEM; |
| |
| strcpy(p->alg_name, algo->name); |
| x->aead = p; |
| x->geniv = algo->uinfo.aead.geniv; |
| return 0; |
| } |
| |
| static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, |
| struct nlattr *rp) |
| { |
| struct xfrm_replay_state_esn *up; |
| unsigned int ulen; |
| |
| if (!replay_esn || !rp) |
| return 0; |
| |
| up = nla_data(rp); |
| ulen = xfrm_replay_state_esn_len(up); |
| |
| /* Check the overall length and the internal bitmap length to avoid |
| * potential overflow. */ |
| if (nla_len(rp) < (int)ulen || |
| xfrm_replay_state_esn_len(replay_esn) != ulen || |
| replay_esn->bmp_len != up->bmp_len) |
| return -EINVAL; |
| |
| if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, |
| struct xfrm_replay_state_esn **preplay_esn, |
| struct nlattr *rta) |
| { |
| struct xfrm_replay_state_esn *p, *pp, *up; |
| unsigned int klen, ulen; |
| |
| if (!rta) |
| return 0; |
| |
| up = nla_data(rta); |
| klen = xfrm_replay_state_esn_len(up); |
| ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up); |
| |
| p = kzalloc(klen, GFP_KERNEL); |
| if (!p) |
| return -ENOMEM; |
| |
| pp = kzalloc(klen, GFP_KERNEL); |
| if (!pp) { |
| kfree(p); |
| return -ENOMEM; |
| } |
| |
| memcpy(p, up, ulen); |
| memcpy(pp, up, ulen); |
| |
| *replay_esn = p; |
| *preplay_esn = pp; |
| |
| return 0; |
| } |
| |
| static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) |
| { |
| unsigned int len = 0; |
| |
| if (xfrm_ctx) { |
| len += sizeof(struct xfrm_user_sec_ctx); |
| len += xfrm_ctx->ctx_len; |
| } |
| return len; |
| } |
| |
| 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 = min_t(unsigned int, p->replay_window, |
| sizeof(x->replay.bitmap) * 8); |
| x->props.reqid = p->reqid; |
| x->props.family = p->family; |
| memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); |
| x->props.flags = p->flags; |
| |
| if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) |
| x->sel.family = p->family; |
| } |
| |
| /* |
| * someday when pfkey also has support, we could have the code |
| * somehow made shareable and move it to xfrm_state.c - JHS |
| * |
| */ |
| static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, |
| int update_esn) |
| { |
| struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; |
| struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; |
| struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; |
| struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; |
| struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; |
| |
| if (re) { |
| struct xfrm_replay_state_esn *replay_esn; |
| replay_esn = nla_data(re); |
| memcpy(x->replay_esn, replay_esn, |
| xfrm_replay_state_esn_len(replay_esn)); |
| memcpy(x->preplay_esn, replay_esn, |
| xfrm_replay_state_esn_len(replay_esn)); |
| } |
| |
| if (rp) { |
| struct xfrm_replay_state *replay; |
| replay = nla_data(rp); |
| memcpy(&x->replay, replay, sizeof(*replay)); |
| memcpy(&x->preplay, replay, sizeof(*replay)); |
| } |
| |
| if (lt) { |
| struct xfrm_lifetime_cur *ltime; |
| ltime = nla_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) |
| x->replay_maxage = nla_get_u32(et); |
| |
| if (rt) |
| x->replay_maxdiff = nla_get_u32(rt); |
| } |
| |
| static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m) |
| { |
| if (attrs[XFRMA_SET_MARK]) { |
| m->v = nla_get_u32(attrs[XFRMA_SET_MARK]); |
| if (attrs[XFRMA_SET_MARK_MASK]) |
| m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]); |
| else |
| m->m = 0xffffffff; |
| } else { |
| m->v = m->m = 0; |
| } |
| } |
| |
| static struct xfrm_state *xfrm_state_construct(struct net *net, |
| struct xfrm_usersa_info *p, |
| struct nlattr **attrs, |
| int *errp) |
| { |
| struct xfrm_state *x = xfrm_state_alloc(net); |
| int err = -ENOMEM; |
| |
| if (!x) |
| goto error_no_put; |
| |
| copy_from_user_state(x, p); |
| |
| if (attrs[XFRMA_SA_EXTRA_FLAGS]) |
| x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); |
| |
| if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD]))) |
| goto error; |
| if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, |
| attrs[XFRMA_ALG_AUTH_TRUNC]))) |
| goto error; |
| if (!x->props.aalgo) { |
| if ((err = attach_auth(&x->aalg, &x->props.aalgo, |
| attrs[XFRMA_ALG_AUTH]))) |
| goto error; |
| } |
| if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT]))) |
| goto error; |
| if ((err = attach_one_algo(&x->calg, &x->props.calgo, |
| xfrm_calg_get_byname, |
| attrs[XFRMA_ALG_COMP]))) |
| goto error; |
| |
| if (attrs[XFRMA_ENCAP]) { |
| x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), |
| sizeof(*x->encap), GFP_KERNEL); |
| if (x->encap == NULL) |
| goto error; |
| } |
| |
| if (attrs[XFRMA_TFCPAD]) |
| x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); |
| |
| if (attrs[XFRMA_COADDR]) { |
| x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), |
| sizeof(*x->coaddr), GFP_KERNEL); |
| if (x->coaddr == NULL) |
| goto error; |
| } |
| |
| xfrm_mark_get(attrs, &x->mark); |
| |
| xfrm_smark_init(attrs, &x->props.smark); |
| |
| if (attrs[XFRMA_IF_ID]) |
| x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); |
| |
| err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]); |
| if (err) |
| goto error; |
| |
| if (attrs[XFRMA_SEC_CTX]) { |
| err = security_xfrm_state_alloc(x, |
| nla_data(attrs[XFRMA_SEC_CTX])); |
| if (err) |
| goto error; |
| } |
| |
| if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, |
| attrs[XFRMA_REPLAY_ESN_VAL]))) |
| goto error; |
| |
| x->km.seq = p->seq; |
| x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; |
| /* sysctl_xfrm_aevent_etime is in 100ms units */ |
| x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; |
| |
| if ((err = xfrm_init_replay(x))) |
| goto error; |
| |
| /* override default values from above */ |
| xfrm_update_ae_params(x, attrs, 0); |
| |
| /* configure the hardware if offload is requested */ |
| if (attrs[XFRMA_OFFLOAD_DEV]) { |
| err = xfrm_dev_state_add(net, x, |
| nla_data(attrs[XFRMA_OFFLOAD_DEV])); |
| if (err) |
| 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, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct xfrm_usersa_info *p = nlmsg_data(nlh); |
| struct xfrm_state *x; |
| int err; |
| struct km_event c; |
| |
| err = verify_newsa_info(p, attrs); |
| if (err) |
| return err; |
| |
| x = xfrm_state_construct(net, p, attrs, &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); |
| |
| xfrm_audit_state_add(x, err ? 0 : 1, true); |
| |
| if (err < 0) { |
| x->km.state = XFRM_STATE_DEAD; |
| xfrm_dev_state_delete(x); |
| __xfrm_state_put(x); |
| goto out; |
| } |
| |
| if (x->km.state == XFRM_STATE_VOID) |
| x->km.state = XFRM_STATE_VALID; |
| |
| c.seq = nlh->nlmsg_seq; |
| c.portid = 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 net *net, |
| struct xfrm_usersa_id *p, |
| struct nlattr **attrs, |
| int *errp) |
| { |
| struct xfrm_state *x = NULL; |
| struct xfrm_mark m; |
| int err; |
| u32 mark = xfrm_mark_get(attrs, &m); |
| |
| if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { |
| err = -ESRCH; |
| x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); |
| } else { |
| xfrm_address_t *saddr = NULL; |
| |
| verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); |
| if (!saddr) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| err = -ESRCH; |
| x = xfrm_state_lookup_byaddr(net, mark, |
| &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, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct xfrm_state *x; |
| int err = -ESRCH; |
| struct km_event c; |
| struct xfrm_usersa_id *p = nlmsg_data(nlh); |
| |
| x = xfrm_user_state_lookup(net, p, attrs, &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.portid = nlh->nlmsg_pid; |
| c.event = nlh->nlmsg_type; |
| km_state_notify(x, &c); |
| |
| out: |
| xfrm_audit_state_delete(x, err ? 0 : 1, true); |
| xfrm_state_put(x); |
| return err; |
| } |
| |
| static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) |
| { |
| memset(p, 0, sizeof(*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)); |
| put_unaligned(x->stats.replay_window, &p->stats.replay_window); |
| put_unaligned(x->stats.replay, &p->stats.replay); |
| put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed); |
| memcpy(&p->saddr, &x->props.saddr, sizeof(p->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; |
| }; |
| |
| static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) |
| { |
| struct xfrm_user_sec_ctx *uctx; |
| struct nlattr *attr; |
| int ctx_size = sizeof(*uctx) + s->ctx_len; |
| |
| attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); |
| if (attr == NULL) |
| return -EMSGSIZE; |
| |
| uctx = nla_data(attr); |
| 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; |
| } |
| |
| static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb) |
| { |
| struct xfrm_user_offload *xuo; |
| struct nlattr *attr; |
| |
| attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo)); |
| if (attr == NULL) |
| return -EMSGSIZE; |
| |
| xuo = nla_data(attr); |
| memset(xuo, 0, sizeof(*xuo)); |
| xuo->ifindex = xso->dev->ifindex; |
| xuo->flags = xso->flags; |
| |
| return 0; |
| } |
| |
| static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) |
| { |
| struct xfrm_algo *algo; |
| struct nlattr *nla; |
| |
| nla = nla_reserve(skb, XFRMA_ALG_AUTH, |
| sizeof(*algo) + (auth->alg_key_len + 7) / 8); |
| if (!nla) |
| return -EMSGSIZE; |
| |
| algo = nla_data(nla); |
| strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); |
| memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); |
| algo->alg_key_len = auth->alg_key_len; |
| |
| return 0; |
| } |
| |
| static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m) |
| { |
| int ret = 0; |
| |
| if (m->v | m->m) { |
| ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v); |
| if (!ret) |
| ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m); |
| } |
| return ret; |
| } |
| |
| /* Don't change this without updating xfrm_sa_len! */ |
| static int copy_to_user_state_extra(struct xfrm_state *x, |
| struct xfrm_usersa_info *p, |
| struct sk_buff *skb) |
| { |
| int ret = 0; |
| |
| copy_to_user_state(x, p); |
| |
| if (x->props.extra_flags) { |
| ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, |
| x->props.extra_flags); |
| if (ret) |
| goto out; |
| } |
| |
| if (x->coaddr) { |
| ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); |
| if (ret) |
| goto out; |
| } |
| if (x->lastused) { |
| ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, |
| XFRMA_PAD); |
| if (ret) |
| goto out; |
| } |
| if (x->aead) { |
| ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); |
| if (ret) |
| goto out; |
| } |
| if (x->aalg) { |
| ret = copy_to_user_auth(x->aalg, skb); |
| if (!ret) |
| ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, |
| xfrm_alg_auth_len(x->aalg), x->aalg); |
| if (ret) |
| goto out; |
| } |
| if (x->ealg) { |
| ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); |
| if (ret) |
| goto out; |
| } |
| if (x->calg) { |
| ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); |
| if (ret) |
| goto out; |
| } |
| if (x->encap) { |
| ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); |
| if (ret) |
| goto out; |
| } |
| if (x->tfcpad) { |
| ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); |
| if (ret) |
| goto out; |
| } |
| ret = xfrm_mark_put(skb, &x->mark); |
| if (ret) |
| goto out; |
| |
| ret = xfrm_smark_put(skb, &x->props.smark); |
| if (ret) |
| goto out; |
| |
| if (x->replay_esn) |
| ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, |
| xfrm_replay_state_esn_len(x->replay_esn), |
| x->replay_esn); |
| else |
| ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), |
| &x->replay); |
| if (ret) |
| goto out; |
| if(x->xso.dev) |
| ret = copy_user_offload(&x->xso, skb); |
| if (ret) |
| goto out; |
| if (x->if_id) { |
| ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id); |
| if (ret) |
| goto out; |
| } |
| if (x->security) |
| ret = copy_sec_ctx(x->security, skb); |
| out: |
| return ret; |
| } |
| |
| 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; |
| int err; |
| |
| nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, |
| XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); |
| if (nlh == NULL) |
| return -EMSGSIZE; |
| |
| p = nlmsg_data(nlh); |
| |
| err = copy_to_user_state_extra(x, p, skb); |
| if (err) { |
| nlmsg_cancel(skb, nlh); |
| return err; |
| } |
| nlmsg_end(skb, nlh); |
| return 0; |
| } |
| |
| static int xfrm_dump_sa_done(struct netlink_callback *cb) |
| { |
| struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; |
| struct sock *sk = cb->skb->sk; |
| struct net *net = sock_net(sk); |
| |
| if (cb->args[0]) |
| xfrm_state_walk_done(walk, net); |
| return 0; |
| } |
| |
| static const struct nla_policy xfrma_policy[XFRMA_MAX+1]; |
| static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; |
| struct xfrm_dump_info info; |
| |
| BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > |
| sizeof(cb->args) - sizeof(cb->args[0])); |
| |
| info.in_skb = cb->skb; |
| info.out_skb = skb; |
| info.nlmsg_seq = cb->nlh->nlmsg_seq; |
| info.nlmsg_flags = NLM_F_MULTI; |
| |
| if (!cb->args[0]) { |
| struct nlattr *attrs[XFRMA_MAX+1]; |
| struct xfrm_address_filter *filter = NULL; |
| u8 proto = 0; |
| int err; |
| |
| err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy, |
| cb->extack); |
| if (err < 0) |
| return err; |
| |
| if (attrs[XFRMA_ADDRESS_FILTER]) { |
| filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), |
| sizeof(*filter), GFP_KERNEL); |
| if (filter == NULL) |
| return -ENOMEM; |
| } |
| |
| if (attrs[XFRMA_PROTO]) |
| proto = nla_get_u8(attrs[XFRMA_PROTO]); |
| |
| xfrm_state_walk_init(walk, proto, filter); |
| cb->args[0] = 1; |
| } |
| |
| (void) xfrm_state_walk(net, walk, dump_one_state, &info); |
| |
| 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; |
| int err; |
| |
| skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
| if (!skb) |
| return ERR_PTR(-ENOMEM); |
| |
| info.in_skb = in_skb; |
| info.out_skb = skb; |
| info.nlmsg_seq = seq; |
| info.nlmsg_flags = 0; |
| |
| err = dump_one_state(x, 0, &info); |
| if (err) { |
| kfree_skb(skb); |
| return ERR_PTR(err); |
| } |
| |
| return skb; |
| } |
| |
| /* A wrapper for nlmsg_multicast() checking that nlsk is still available. |
| * Must be called with RCU read lock. |
| */ |
| static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, |
| u32 pid, unsigned int group) |
| { |
| struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); |
| |
| if (!nlsk) { |
| kfree_skb(skb); |
| return -EPIPE; |
| } |
| |
| return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); |
| } |
| |
| static inline unsigned int xfrm_spdinfo_msgsize(void) |
| { |
| return NLMSG_ALIGN(4) |
| + nla_total_size(sizeof(struct xfrmu_spdinfo)) |
| + nla_total_size(sizeof(struct xfrmu_spdhinfo)) |
| + nla_total_size(sizeof(struct xfrmu_spdhthresh)) |
| + nla_total_size(sizeof(struct xfrmu_spdhthresh)); |
| } |
| |
| static int build_spdinfo(struct sk_buff *skb, struct net *net, |
| u32 portid, u32 seq, u32 flags) |
| { |
| struct xfrmk_spdinfo si; |
| struct xfrmu_spdinfo spc; |
| struct xfrmu_spdhinfo sph; |
| struct xfrmu_spdhthresh spt4, spt6; |
| struct nlmsghdr *nlh; |
| int err; |
| u32 *f; |
| unsigned lseq; |
| |
| nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); |
| if (nlh == NULL) /* shouldn't really happen ... */ |
| return -EMSGSIZE; |
| |
| f = nlmsg_data(nlh); |
| *f = flags; |
| xfrm_spd_getinfo(net, &si); |
| spc.incnt = si.incnt; |
| spc.outcnt = si.outcnt; |
| spc.fwdcnt = si.fwdcnt; |
| spc.inscnt = si.inscnt; |
| spc.outscnt = si.outscnt; |
| spc.fwdscnt = si.fwdscnt; |
| sph.spdhcnt = si.spdhcnt; |
| sph.spdhmcnt = si.spdhmcnt; |
| |
| do { |
| lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); |
| |
| spt4.lbits = net->xfrm.policy_hthresh.lbits4; |
| spt4.rbits = net->xfrm.policy_hthresh.rbits4; |
| spt6.lbits = net->xfrm.policy_hthresh.lbits6; |
| spt6.rbits = net->xfrm.policy_hthresh.rbits6; |
| } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); |
| |
| err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); |
| if (!err) |
| err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); |
| if (!err) |
| err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); |
| if (!err) |
| err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); |
| if (err) { |
| nlmsg_cancel(skb, nlh); |
| return err; |
| } |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| } |
| |
| static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct xfrmu_spdhthresh *thresh4 = NULL; |
| struct xfrmu_spdhthresh *thresh6 = NULL; |
| |
| /* selector prefixlen thresholds to hash policies */ |
| if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { |
| struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; |
| |
| if (nla_len(rta) < sizeof(*thresh4)) |
| return -EINVAL; |
| thresh4 = nla_data(rta); |
| if (thresh4->lbits > 32 || thresh4->rbits > 32) |
| return -EINVAL; |
| } |
| if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { |
| struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; |
| |
| if (nla_len(rta) < sizeof(*thresh6)) |
| return -EINVAL; |
| thresh6 = nla_data(rta); |
| if (thresh6->lbits > 128 || thresh6->rbits > 128) |
| return -EINVAL; |
| } |
| |
| if (thresh4 || thresh6) { |
| write_seqlock(&net->xfrm.policy_hthresh.lock); |
| if (thresh4) { |
| net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; |
| net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; |
| } |
| if (thresh6) { |
| net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; |
| net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; |
| } |
| write_sequnlock(&net->xfrm.policy_hthresh.lock); |
| |
| xfrm_policy_hash_rebuild(net); |
| } |
| |
| return 0; |
| } |
| |
| static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct sk_buff *r_skb; |
| u32 *flags = nlmsg_data(nlh); |
| u32 sportid = NETLINK_CB(skb).portid; |
| u32 seq = nlh->nlmsg_seq; |
| int err; |
| |
| r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); |
| if (r_skb == NULL) |
| return -ENOMEM; |
| |
| err = build_spdinfo(r_skb, net, sportid, seq, *flags); |
| BUG_ON(err < 0); |
| |
| return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); |
| } |
| |
| static inline unsigned int xfrm_sadinfo_msgsize(void) |
| { |
| return NLMSG_ALIGN(4) |
| + nla_total_size(sizeof(struct xfrmu_sadhinfo)) |
| + nla_total_size(4); /* XFRMA_SAD_CNT */ |
| } |
| |
| static int build_sadinfo(struct sk_buff *skb, struct net *net, |
| u32 portid, u32 seq, u32 flags) |
| { |
| struct xfrmk_sadinfo si; |
| struct xfrmu_sadhinfo sh; |
| struct nlmsghdr *nlh; |
| int err; |
| u32 *f; |
| |
| nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); |
| if (nlh == NULL) /* shouldn't really happen ... */ |
| return -EMSGSIZE; |
| |
| f = nlmsg_data(nlh); |
| *f = flags; |
| xfrm_sad_getinfo(net, &si); |
| |
| sh.sadhmcnt = si.sadhmcnt; |
| sh.sadhcnt = si.sadhcnt; |
| |
| err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); |
| if (!err) |
| err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); |
| if (err) { |
| nlmsg_cancel(skb, nlh); |
| return err; |
| } |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| } |
| |
| static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct sk_buff *r_skb; |
| u32 *flags = nlmsg_data(nlh); |
| u32 sportid = NETLINK_CB(skb).portid; |
| u32 seq = nlh->nlmsg_seq; |
| int err; |
| |
| r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); |
| if (r_skb == NULL) |
| return -ENOMEM; |
| |
| err = build_sadinfo(r_skb, net, sportid, seq, *flags); |
| BUG_ON(err < 0); |
| |
| return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); |
| } |
| |
| static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| 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(net, p, attrs, &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 = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); |
| } |
| xfrm_state_put(x); |
| out_noput: |
| return err; |
| } |
| |
| static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct xfrm_state *x; |
| struct xfrm_userspi_info *p; |
| struct sk_buff *resp_skb; |
| xfrm_address_t *daddr; |
| int family; |
| int err; |
| u32 mark; |
| struct xfrm_mark m; |
| u32 if_id = 0; |
| |
| p = nlmsg_data(nlh); |
| err = verify_spi_info(p->info.id.proto, p->min, p->max); |
| if (err) |
| goto out_noput; |
| |
| family = p->info.family; |
| daddr = &p->info.id.daddr; |
| |
| x = NULL; |
| |
| mark = xfrm_mark_get(attrs, &m); |
| |
| if (attrs[XFRMA_IF_ID]) |
| if_id = nla_get_u32(attrs[XFRMA_IF_ID]); |
| |
| if (p->info.seq) { |
| x = xfrm_find_acq_byseq(net, mark, p->info.seq); |
| if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { |
| xfrm_state_put(x); |
| x = NULL; |
| } |
| } |
| |
| if (!x) |
| x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, |
| if_id, p->info.id.proto, daddr, |
| &p->info.saddr, 1, |
| family); |
| err = -ENOENT; |
| if (x == NULL) |
| goto out_noput; |
| |
| err = xfrm_alloc_spi(x, p->min, p->max); |
| if (err) |
| goto out; |
| |
| resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); |
| if (IS_ERR(resp_skb)) { |
| err = PTR_ERR(resp_skb); |
| goto out; |
| } |
| |
| err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); |
| |
| 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) |
| { |
| int ret; |
| |
| 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: |
| if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) |
| return -EINVAL; |
| |
| break; |
| |
| case AF_INET6: |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) |
| return -EINVAL; |
| |
| break; |
| #else |
| return -EAFNOSUPPORT; |
| #endif |
| |
| default: |
| return -EINVAL; |
| } |
| |
| ret = verify_policy_dir(p->dir); |
| if (ret) |
| return ret; |
| if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) |
| { |
| struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
| struct xfrm_user_sec_ctx *uctx; |
| |
| if (!rt) |
| return 0; |
| |
| uctx = nla_data(rt); |
| return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); |
| } |
| |
| 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; |
| /* If all masks are ~0, then we allow all algorithms. */ |
| t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); |
| t->encap_family = ut->family; |
| } |
| } |
| |
| static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) |
| { |
| u16 prev_family; |
| int i; |
| |
| if (nr > XFRM_MAX_DEPTH) |
| return -EINVAL; |
| |
| prev_family = family; |
| |
| for (i = 0; i < nr; i++) { |
| /* We never validated the ut->family value, so many |
| * applications simply leave it at zero. The check was |
| * never made and ut->family was ignored because all |
| * templates could be assumed to have the same family as |
| * the policy itself. Now that we will have ipv4-in-ipv6 |
| * and ipv6-in-ipv4 tunnels, this is no longer true. |
| */ |
| if (!ut[i].family) |
| ut[i].family = family; |
| |
| switch (ut[i].mode) { |
| case XFRM_MODE_TUNNEL: |
| case XFRM_MODE_BEET: |
| break; |
| default: |
| if (ut[i].family != prev_family) |
| return -EINVAL; |
| break; |
| } |
| if (ut[i].mode >= XFRM_MODE_MAX) |
| return -EINVAL; |
| |
| prev_family = ut[i].family; |
| |
| switch (ut[i].family) { |
| case AF_INET: |
| break; |
| #if IS_ENABLED(CONFIG_IPV6) |
| case AF_INET6: |
| break; |
| #endif |
| default: |
| return -EINVAL; |
| } |
| |
| if (!xfrm_id_proto_valid(ut[i].id.proto)) |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) |
| { |
| struct nlattr *rt = attrs[XFRMA_TMPL]; |
| |
| if (!rt) { |
| pol->xfrm_nr = 0; |
| } else { |
| struct xfrm_user_tmpl *utmpl = nla_data(rt); |
| int nr = nla_len(rt) / sizeof(*utmpl); |
| int err; |
| |
| err = validate_tmpl(nr, utmpl, pol->family); |
| if (err) |
| return err; |
| |
| copy_templates(pol, utmpl, nr); |
| } |
| return 0; |
| } |
| |
| static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) |
| { |
| struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; |
| struct xfrm_userpolicy_type *upt; |
| u8 type = XFRM_POLICY_TYPE_MAIN; |
| int err; |
| |
| if (rt) { |
| upt = nla_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) |
| { |
| memset(p, 0, sizeof(*p)); |
| 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 net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) |
| { |
| struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); |
| int err; |
| |
| if (!xp) { |
| *errp = -ENOMEM; |
| return NULL; |
| } |
| |
| copy_from_user_policy(xp, p); |
| |
| err = copy_from_user_policy_type(&xp->type, attrs); |
| if (err) |
| goto error; |
| |
| if (!(err = copy_from_user_tmpl(xp, attrs))) |
| err = copy_from_user_sec_ctx(xp, attrs); |
| if (err) |
| goto error; |
| |
| xfrm_mark_get(attrs, &xp->mark); |
| |
| if (attrs[XFRMA_IF_ID]) |
| xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); |
| |
| return xp; |
| error: |
| *errp = err; |
| xp->walk.dead = 1; |
| xfrm_policy_destroy(xp); |
| return NULL; |
| } |
| |
| static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| 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(attrs); |
| if (err) |
| return err; |
| |
| xp = xfrm_policy_construct(net, p, attrs, &err); |
| if (!xp) |
| return err; |
| |
| /* shouldn't 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); |
| xfrm_audit_policy_add(xp, err ? 0 : 1, true); |
| |
| if (err) { |
| security_xfrm_policy_free(xp->security); |
| kfree(xp); |
| return err; |
| } |
| |
| c.event = nlh->nlmsg_type; |
| c.seq = nlh->nlmsg_seq; |
| c.portid = 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]; |
| |
| memset(up, 0, sizeof(*up)); |
| memcpy(&up->id, &kp->id, sizeof(up->id)); |
| up->family = kp->encap_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; |
| } |
| |
| return nla_put(skb, XFRMA_TMPL, |
| sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); |
| } |
| |
| 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; |
| } |
| static inline unsigned int userpolicy_type_attrsize(void) |
| { |
| #ifdef CONFIG_XFRM_SUB_POLICY |
| return nla_total_size(sizeof(struct xfrm_userpolicy_type)); |
| #else |
| return 0; |
| #endif |
| } |
| |
| #ifdef CONFIG_XFRM_SUB_POLICY |
| static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) |
| { |
| struct xfrm_userpolicy_type upt; |
| |
| /* Sadly there are two holes in struct xfrm_userpolicy_type */ |
| memset(&upt, 0, sizeof(upt)); |
| upt.type = type; |
| |
| return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); |
| } |
| |
| #else |
| static inline int copy_to_user_policy_type(u8 type, 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; |
| int err; |
| |
| nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, |
| XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); |
| if (nlh == NULL) |
| return -EMSGSIZE; |
| |
| p = nlmsg_data(nlh); |
| copy_to_user_policy(xp, p, dir); |
| err = copy_to_user_tmpl(xp, skb); |
| if (!err) |
| err = copy_to_user_sec_ctx(xp, skb); |
| if (!err) |
| err = copy_to_user_policy_type(xp->type, skb); |
| if (!err) |
| err = xfrm_mark_put(skb, &xp->mark); |
| if (!err) |
| err = xfrm_if_id_put(skb, xp->if_id); |
| if (err) { |
| nlmsg_cancel(skb, nlh); |
| return err; |
| } |
| nlmsg_end(skb, nlh); |
| return 0; |
| } |
| |
| static int xfrm_dump_policy_done(struct netlink_callback *cb) |
| { |
| struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; |
| struct net *net = sock_net(cb->skb->sk); |
| |
| xfrm_policy_walk_done(walk, net); |
| return 0; |
| } |
| |
| static int xfrm_dump_policy_start(struct netlink_callback *cb) |
| { |
| struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; |
| |
| BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args)); |
| |
| xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); |
| return 0; |
| } |
| |
| static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; |
| 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; |
| |
| (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); |
| |
| 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; |
| int err; |
| |
| skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| if (!skb) |
| return ERR_PTR(-ENOMEM); |
| |
| info.in_skb = in_skb; |
| info.out_skb = skb; |
| info.nlmsg_seq = seq; |
| info.nlmsg_flags = 0; |
| |
| err = dump_one_policy(xp, dir, 0, &info); |
| if (err) { |
| kfree_skb(skb); |
| return ERR_PTR(err); |
| } |
| |
| return skb; |
| } |
| |
| static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct xfrm_policy *xp; |
| struct xfrm_userpolicy_id *p; |
| u8 type = XFRM_POLICY_TYPE_MAIN; |
| int err; |
| struct km_event c; |
| int delete; |
| struct xfrm_mark m; |
| u32 mark = xfrm_mark_get(attrs, &m); |
| u32 if_id = 0; |
| |
| p = nlmsg_data(nlh); |
| delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; |
| |
| err = copy_from_user_policy_type(&type, attrs); |
| if (err) |
| return err; |
| |
| err = verify_policy_dir(p->dir); |
| if (err) |
| return err; |
| |
| if (attrs[XFRMA_IF_ID]) |
| if_id = nla_get_u32(attrs[XFRMA_IF_ID]); |
| |
| if (p->index) |
| xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, delete, &err); |
| else { |
| struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
| struct xfrm_sec_ctx *ctx; |
| |
| err = verify_sec_ctx_len(attrs); |
| if (err) |
| return err; |
| |
| ctx = NULL; |
| if (rt) { |
| struct xfrm_user_sec_ctx *uctx = nla_data(rt); |
| |
| err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); |
| if (err) |
| return err; |
| } |
| xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir, &p->sel, |
| ctx, delete, &err); |
| security_xfrm_policy_free(ctx); |
| } |
| 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 = nlmsg_unicast(net->xfrm.nlsk, resp_skb, |
| NETLINK_CB(skb).portid); |
| } |
| } else { |
| xfrm_audit_policy_delete(xp, err ? 0 : 1, true); |
| |
| if (err != 0) |
| goto out; |
| |
| c.data.byid = p->index; |
| c.event = nlh->nlmsg_type; |
| c.seq = nlh->nlmsg_seq; |
| c.portid = nlh->nlmsg_pid; |
| km_policy_notify(xp, p->dir, &c); |
| } |
| |
| out: |
| xfrm_pol_put(xp); |
| return err; |
| } |
| |
| static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct km_event c; |
| struct xfrm_usersa_flush *p = nlmsg_data(nlh); |
| int err; |
| |
| err = xfrm_state_flush(net, p->proto, true, false); |
| if (err) { |
| if (err == -ESRCH) /* empty table */ |
| return 0; |
| return err; |
| } |
| c.data.proto = p->proto; |
| c.event = nlh->nlmsg_type; |
| c.seq = nlh->nlmsg_seq; |
| c.portid = nlh->nlmsg_pid; |
| c.net = net; |
| km_state_notify(NULL, &c); |
| |
| return 0; |
| } |
| |
| static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x) |
| { |
| unsigned int replay_size = x->replay_esn ? |
| xfrm_replay_state_esn_len(x->replay_esn) : |
| sizeof(struct xfrm_replay_state); |
| |
| return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) |
| + nla_total_size(replay_size) |
| + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) |
| + nla_total_size(sizeof(struct xfrm_mark)) |
| + nla_total_size(4) /* XFRM_AE_RTHR */ |
| + nla_total_size(4); /* XFRM_AE_ETHR */ |
| } |
| |
| static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) |
| { |
| struct xfrm_aevent_id *id; |
| struct nlmsghdr *nlh; |
| int err; |
| |
| nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); |
| if (nlh == NULL) |
| return -EMSGSIZE; |
| |
| id = nlmsg_data(nlh); |
| memset(&id->sa_id, 0, sizeof(id->sa_id)); |
| memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); |
| id->sa_id.spi = x->id.spi; |
| id->sa_id.family = x->props.family; |
| id->sa_id.proto = x->id.proto; |
| memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); |
| id->reqid = x->props.reqid; |
| id->flags = c->data.aevent; |
| |
| if (x->replay_esn) { |
| err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, |
| xfrm_replay_state_esn_len(x->replay_esn), |
| x->replay_esn); |
| } else { |
| err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), |
| &x->replay); |
| } |
| if (err) |
| goto out_cancel; |
| err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, |
| XFRMA_PAD); |
| if (err) |
| goto out_cancel; |
| |
| if (id->flags & XFRM_AE_RTHR) { |
| err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); |
| if (err) |
| goto out_cancel; |
| } |
| if (id->flags & XFRM_AE_ETHR) { |
| err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, |
| x->replay_maxage * 10 / HZ); |
| if (err) |
| goto out_cancel; |
| } |
| err = xfrm_mark_put(skb, &x->mark); |
| if (err) |
| goto out_cancel; |
| |
| err = xfrm_if_id_put(skb, x->if_id); |
| if (err) |
| goto out_cancel; |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| |
| out_cancel: |
| nlmsg_cancel(skb, nlh); |
| return err; |
| } |
| |
| static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct xfrm_state *x; |
| struct sk_buff *r_skb; |
| int err; |
| struct km_event c; |
| u32 mark; |
| struct xfrm_mark m; |
| struct xfrm_aevent_id *p = nlmsg_data(nlh); |
| struct xfrm_usersa_id *id = &p->sa_id; |
| |
| mark = xfrm_mark_get(attrs, &m); |
| |
| x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); |
| if (x == NULL) |
| return -ESRCH; |
| |
| r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); |
| if (r_skb == NULL) { |
| xfrm_state_put(x); |
| return -ENOMEM; |
| } |
| |
| /* |
| * 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.portid = nlh->nlmsg_pid; |
| |
| err = build_aevent(r_skb, x, &c); |
| BUG_ON(err < 0); |
| |
| err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); |
| spin_unlock_bh(&x->lock); |
| xfrm_state_put(x); |
| return err; |
| } |
| |
| static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct xfrm_state *x; |
| struct km_event c; |
| int err = -EINVAL; |
| u32 mark = 0; |
| struct xfrm_mark m; |
| struct xfrm_aevent_id *p = nlmsg_data(nlh); |
| struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; |
| struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; |
| struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; |
| struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; |
| struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; |
| |
| if (!lt && !rp && !re && !et && !rt) |
| return err; |
| |
| /* pedantic mode - thou shalt sayeth replaceth */ |
| if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) |
| return err; |
| |
| mark = xfrm_mark_get(attrs, &m); |
| |
| x = xfrm_state_lookup(net, mark, &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; |
| |
| err = xfrm_replay_verify_len(x->replay_esn, re); |
| if (err) |
| goto out; |
| |
| spin_lock_bh(&x->lock); |
| xfrm_update_ae_params(x, attrs, 1); |
| spin_unlock_bh(&x->lock); |
| |
| c.event = nlh->nlmsg_type; |
| c.seq = nlh->nlmsg_seq; |
| c.portid = 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, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct km_event c; |
| u8 type = XFRM_POLICY_TYPE_MAIN; |
| int err; |
| |
| err = copy_from_user_policy_type(&type, attrs); |
| if (err) |
| return err; |
| |
| err = xfrm_policy_flush(net, type, true); |
| if (err) { |
| if (err == -ESRCH) /* empty table */ |
| return 0; |
| return err; |
| } |
| |
| c.data.type = type; |
| c.event = nlh->nlmsg_type; |
| c.seq = nlh->nlmsg_seq; |
| c.portid = nlh->nlmsg_pid; |
| c.net = net; |
| km_policy_notify(NULL, 0, &c); |
| return 0; |
| } |
| |
| static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| 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; |
| struct xfrm_mark m; |
| u32 mark = xfrm_mark_get(attrs, &m); |
| u32 if_id = 0; |
| |
| err = copy_from_user_policy_type(&type, attrs); |
| if (err) |
| return err; |
| |
| err = verify_policy_dir(p->dir); |
| if (err) |
| return err; |
| |
| if (attrs[XFRMA_IF_ID]) |
| if_id = nla_get_u32(attrs[XFRMA_IF_ID]); |
| |
| if (p->index) |
| xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, 0, &err); |
| else { |
| struct nlattr *rt = attrs[XFRMA_SEC_CTX]; |
| struct xfrm_sec_ctx *ctx; |
| |
| err = verify_sec_ctx_len(attrs); |
| if (err) |
| return err; |
| |
| ctx = NULL; |
| if (rt) { |
| struct xfrm_user_sec_ctx *uctx = nla_data(rt); |
| |
| err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); |
| if (err) |
| return err; |
| } |
| xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir, |
| &p->sel, ctx, 0, &err); |
| security_xfrm_policy_free(ctx); |
| } |
| if (xp == NULL) |
| return -ENOENT; |
| |
| if (unlikely(xp->walk.dead)) |
| goto out; |
| |
| err = 0; |
| if (up->hard) { |
| xfrm_policy_delete(xp, p->dir); |
| xfrm_audit_policy_delete(xp, 1, true); |
| } |
| km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); |
| |
| out: |
| xfrm_pol_put(xp); |
| return err; |
| } |
| |
| static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct xfrm_state *x; |
| int err; |
| struct xfrm_user_expire *ue = nlmsg_data(nlh); |
| struct xfrm_usersa_info *p = &ue->state; |
| struct xfrm_mark m; |
| u32 mark = xfrm_mark_get(attrs, &m); |
| |
| x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); |
| |
| err = -ENOENT; |
| if (x == NULL) |
| return err; |
| |
| spin_lock_bh(&x->lock); |
| err = -EINVAL; |
| if (x->km.state != XFRM_STATE_VALID) |
| goto out; |
| km_state_expired(x, ue->hard, nlh->nlmsg_pid); |
| |
| if (ue->hard) { |
| __xfrm_state_delete(x); |
| xfrm_audit_state_delete(x, 1, true); |
| } |
| err = 0; |
| out: |
| spin_unlock_bh(&x->lock); |
| xfrm_state_put(x); |
| return err; |
| } |
| |
| static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct xfrm_policy *xp; |
| struct xfrm_user_tmpl *ut; |
| int i; |
| struct nlattr *rt = attrs[XFRMA_TMPL]; |
| struct xfrm_mark mark; |
| |
| struct xfrm_user_acquire *ua = nlmsg_data(nlh); |
| struct xfrm_state *x = xfrm_state_alloc(net); |
| int err = -ENOMEM; |
| |
| if (!x) |
| goto nomem; |
| |
| xfrm_mark_get(attrs, &mark); |
| |
| err = verify_newpolicy_info(&ua->policy); |
| if (err) |
| goto free_state; |
| |
| /* build an XP */ |
| xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); |
| if (!xp) |
| goto free_state; |
| |
| 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)); |
| xp->mark.m = x->mark.m = mark.m; |
| xp->mark.v = x->mark.v = mark.v; |
| ut = nla_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); |
| |
| } |
| |
| xfrm_state_free(x); |
| kfree(xp); |
| |
| return 0; |
| |
| free_state: |
| xfrm_state_free(x); |
| nomem: |
| return err; |
| } |
| |
| #ifdef CONFIG_XFRM_MIGRATE |
| static int copy_from_user_migrate(struct xfrm_migrate *ma, |
| struct xfrm_kmaddress *k, |
| struct nlattr **attrs, int *num) |
| { |
| struct nlattr *rt = attrs[XFRMA_MIGRATE]; |
| struct xfrm_user_migrate *um; |
| int i, num_migrate; |
| |
| if (k != NULL) { |
| struct xfrm_user_kmaddress *uk; |
| |
| uk = nla_data(attrs[XFRMA_KMADDRESS]); |
| memcpy(&k->local, &uk->local, sizeof(k->local)); |
| memcpy(&k->remote, &uk->remote, sizeof(k->remote)); |
| k->family = uk->family; |
| k->reserved = uk->reserved; |
| } |
| |
| um = nla_data(rt); |
| num_migrate = nla_len(rt) / sizeof(*um); |
| |
| if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) |
| return -EINVAL; |
| |
| for (i = 0; i < num_migrate; i++, um++, ma++) { |
| memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); |
| memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); |
| memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); |
| memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); |
| |
| ma->proto = um->proto; |
| ma->mode = um->mode; |
| ma->reqid = um->reqid; |
| |
| ma->old_family = um->old_family; |
| ma->new_family = um->new_family; |
| } |
| |
| *num = i; |
| return 0; |
| } |
| |
| static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); |
| struct xfrm_migrate m[XFRM_MAX_DEPTH]; |
| struct xfrm_kmaddress km, *kmp; |
| u8 type; |
| int err; |
| int n = 0; |
| struct net *net = sock_net(skb->sk); |
| struct xfrm_encap_tmpl *encap = NULL; |
| |
| if (attrs[XFRMA_MIGRATE] == NULL) |
| return -EINVAL; |
| |
| kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; |
| |
| err = copy_from_user_policy_type(&type, attrs); |
| if (err) |
| return err; |
| |
| err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); |
| if (err) |
| return err; |
| |
| if (!n) |
| return 0; |
| |
| if (attrs[XFRMA_ENCAP]) { |
| encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), |
| sizeof(*encap), GFP_KERNEL); |
| if (!encap) |
| return 0; |
| } |
| |
| err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap); |
| |
| kfree(encap); |
| |
| return err; |
| } |
| #else |
| static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct nlattr **attrs) |
| { |
| return -ENOPROTOOPT; |
| } |
| #endif |
| |
| #ifdef CONFIG_XFRM_MIGRATE |
| static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) |
| { |
| struct xfrm_user_migrate um; |
| |
| memset(&um, 0, sizeof(um)); |
| um.proto = m->proto; |
| um.mode = m->mode; |
| um.reqid = m->reqid; |
| um.old_family = m->old_family; |
| memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); |
| memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); |
| um.new_family = m->new_family; |
| memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); |
| memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); |
| |
| return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); |
| } |
| |
| static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) |
| { |
| struct xfrm_user_kmaddress uk; |
| |
| memset(&uk, 0, sizeof(uk)); |
| uk.family = k->family; |
| uk.reserved = k->reserved; |
| memcpy(&uk.local, &k->local, sizeof(uk.local)); |
| memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); |
| |
| return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); |
| } |
| |
| static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma, |
| int with_encp) |
| { |
| return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) |
| + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) |
| + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0) |
| + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) |
| + userpolicy_type_attrsize(); |
| } |
| |
| static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, |
| int num_migrate, const struct xfrm_kmaddress *k, |
| const struct xfrm_selector *sel, |
| const struct xfrm_encap_tmpl *encap, u8 dir, u8 type) |
| { |
| const struct xfrm_migrate *mp; |
| struct xfrm_userpolicy_id *pol_id; |
| struct nlmsghdr *nlh; |
| int i, err; |
| |
| nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); |
| if (nlh == NULL) |
| return -EMSGSIZE; |
| |
| pol_id = nlmsg_data(nlh); |
| /* copy data from selector, dir, and type to the pol_id */ |
| memset(pol_id, 0, sizeof(*pol_id)); |
| memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); |
| pol_id->dir = dir; |
| |
| if (k != NULL) { |
| err = copy_to_user_kmaddress(k, skb); |
| if (err) |
| goto out_cancel; |
| } |
| if (encap) { |
| err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap); |
| if (err) |
| goto out_cancel; |
| } |
| err = copy_to_user_policy_type(type, skb); |
| if (err) |
| goto out_cancel; |
| for (i = 0, mp = m ; i < num_migrate; i++, mp++) { |
| err = copy_to_user_migrate(mp, skb); |
| if (err) |
| goto out_cancel; |
| } |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| |
| out_cancel: |
| nlmsg_cancel(skb, nlh); |
| return err; |
| } |
| |
| static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
| const struct xfrm_migrate *m, int num_migrate, |
| const struct xfrm_kmaddress *k, |
| const struct xfrm_encap_tmpl *encap) |
| { |
| struct net *net = &init_net; |
| struct sk_buff *skb; |
| int err; |
| |
| skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap), |
| GFP_ATOMIC); |
| if (skb == NULL) |
| return -ENOMEM; |
| |
| /* build migrate */ |
| err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type); |
| BUG_ON(err < 0); |
| |
| return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); |
| } |
| #else |
| static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
| const struct xfrm_migrate *m, int num_migrate, |
| const struct xfrm_kmaddress *k, |
| const struct xfrm_encap_tmpl *encap) |
| { |
| return -ENOPROTOOPT; |
| } |
| #endif |
| |
| #define XMSGSIZE(type) 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] = 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), |
| [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), |
| [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), |
| [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), |
| [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), |
| }; |
| |
| #undef XMSGSIZE |
| |
| static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { |
| [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, |
| [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, |
| [XFRMA_LASTUSED] = { .type = NLA_U64}, |
| [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, |
| [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, |
| [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, |
| [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, |
| [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, |
| [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, |
| [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, |
| [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, |
| [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, |
| [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, |
| [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, |
| [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, |
| [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, |
| [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, |
| [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, |
| [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, |
| [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, |
| [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, |
| [XFRMA_TFCPAD] = { .type = NLA_U32 }, |
| [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, |
| [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, |
| [XFRMA_PROTO] = { .type = NLA_U8 }, |
| [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, |
| [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, |
| [XFRMA_SET_MARK] = { .type = NLA_U32 }, |
| [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 }, |
| [XFRMA_IF_ID] = { .type = NLA_U32 }, |
| }; |
| |
| static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { |
| [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, |
| [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, |
| }; |
| |
| static const struct xfrm_link { |
| int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); |
| int (*start)(struct netlink_callback *); |
| int (*dump)(struct sk_buff *, struct netlink_callback *); |
| int (*done)(struct netlink_callback *); |
| const struct nla_policy *nla_pol; |
| int nla_max; |
| } 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, |
| .done = xfrm_dump_sa_done }, |
| [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, |
| .start = xfrm_dump_policy_start, |
| .dump = xfrm_dump_policy, |
| .done = xfrm_dump_policy_done }, |
| [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 }, |
| [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, |
| [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, |
| [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, |
| .nla_pol = xfrma_spd_policy, |
| .nla_max = XFRMA_SPD_MAX }, |
| [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, |
| }; |
| |
| static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, |
| struct netlink_ext_ack *extack) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct nlattr *attrs[XFRMA_MAX+1]; |
| const struct xfrm_link *link; |
| int type, err; |
| |
| if (in_compat_syscall()) |
| return -EOPNOTSUPP; |
| |
| type = nlh->nlmsg_type; |
| if (type > XFRM_MSG_MAX) |
| return -EINVAL; |
| |
| type -= XFRM_MSG_BASE; |
| link = &xfrm_dispatch[type]; |
| |
| /* All operations require privileges, even GET */ |
| if (!netlink_net_capable(skb, CAP_NET_ADMIN)) |
| return -EPERM; |
| |
| 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) |
| return -EINVAL; |
| |
| { |
| struct netlink_dump_control c = { |
| .start = link->start, |
| .dump = link->dump, |
| .done = link->done, |
| }; |
| return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); |
| } |
| } |
| |
| err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, |
| link->nla_max ? : XFRMA_MAX, |
| link->nla_pol ? : xfrma_policy, extack); |
| if (err < 0) |
| return err; |
| |
| if (link->doit == NULL) |
| return -EINVAL; |
| |
| return link->doit(skb, nlh, attrs); |
| } |
| |
| static void xfrm_netlink_rcv(struct sk_buff *skb) |
| { |
| struct net *net = sock_net(skb->sk); |
| |
| mutex_lock(&net->xfrm.xfrm_cfg_mutex); |
| netlink_rcv_skb(skb, &xfrm_user_rcv_msg); |
| mutex_unlock(&net->xfrm.xfrm_cfg_mutex); |
| } |
| |
| static inline unsigned int xfrm_expire_msgsize(void) |
| { |
| return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) |
| + nla_total_size(sizeof(struct xfrm_mark)); |
| } |
| |
| static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) |
| { |
| struct xfrm_user_expire *ue; |
| struct nlmsghdr *nlh; |
| int err; |
| |
| nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); |
| if (nlh == NULL) |
| return -EMSGSIZE; |
| |
| ue = nlmsg_data(nlh); |
| copy_to_user_state(x, &ue->state); |
| ue->hard = (c->data.hard != 0) ? 1 : 0; |
| /* clear the padding bytes */ |
| memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard)); |
| |
| err = xfrm_mark_put(skb, &x->mark); |
| if (err) |
| return err; |
| |
| err = xfrm_if_id_put(skb, x->if_id); |
| if (err) |
| return err; |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| } |
| |
| static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) |
| { |
| struct net *net = xs_net(x); |
| struct sk_buff *skb; |
| |
| skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); |
| if (skb == NULL) |
| return -ENOMEM; |
| |
| if (build_expire(skb, x, c) < 0) { |
| kfree_skb(skb); |
| return -EMSGSIZE; |
| } |
| |
| return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); |
| } |
| |
| static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) |
| { |
| struct net *net = xs_net(x); |
| struct sk_buff *skb; |
| int err; |
| |
| skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); |
| if (skb == NULL) |
| return -ENOMEM; |
| |
| err = build_aevent(skb, x, c); |
| BUG_ON(err < 0); |
| |
| return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); |
| } |
| |
| static int xfrm_notify_sa_flush(const struct km_event *c) |
| { |
| struct net *net = c->net; |
| struct xfrm_usersa_flush *p; |
| struct nlmsghdr *nlh; |
| struct sk_buff *skb; |
| int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); |
| |
| skb = nlmsg_new(len, GFP_ATOMIC); |
| if (skb == NULL) |
| return -ENOMEM; |
| |
| nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); |
| if (nlh == NULL) { |
| kfree_skb(skb); |
| return -EMSGSIZE; |
| } |
| |
| p = nlmsg_data(nlh); |
| p->proto = c->data.proto; |
| |
| nlmsg_end(skb, nlh); |
| |
| return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); |
| } |
| |
| static inline unsigned int xfrm_sa_len(struct xfrm_state *x) |
| { |
| unsigned int l = 0; |
| if (x->aead) |
| l += nla_total_size(aead_len(x->aead)); |
| if (x->aalg) { |
| l += nla_total_size(sizeof(struct xfrm_algo) + |
| (x->aalg->alg_key_len + 7) / 8); |
| l += nla_total_size(xfrm_alg_auth_len(x->aalg)); |
| } |
| if (x->ealg) |
| l += nla_total_size(xfrm_alg_len(x->ealg)); |
| if (x->calg) |
| l += nla_total_size(sizeof(*x->calg)); |
| if (x->encap) |
| l += nla_total_size(sizeof(*x->encap)); |
| if (x->tfcpad) |
| l += nla_total_size(sizeof(x->tfcpad)); |
| if (x->replay_esn) |
| l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); |
| else |
| l += nla_total_size(sizeof(struct xfrm_replay_state)); |
| if (x->security) |
| l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + |
| x->security->ctx_len); |
| if (x->coaddr) |
| l += nla_total_size(sizeof(*x->coaddr)); |
| if (x->props.extra_flags) |
| l += nla_total_size(sizeof(x->props.extra_flags)); |
| if (x->xso.dev) |
| l += nla_total_size(sizeof(x->xso)); |
| if (x->props.smark.v | x->props.smark.m) { |
| l += nla_total_size(sizeof(x->props.smark.v)); |
| l += nla_total_size(sizeof(x->props.smark.m)); |
| } |
| if (x->if_id) |
| l += nla_total_size(sizeof(x->if_id)); |
| |
| /* Must count x->lastused as it may become non-zero behind our back. */ |
| l += nla_total_size_64bit(sizeof(u64)); |
| |
| return l; |
| } |
| |
| static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) |
| { |
| struct net *net = xs_net(x); |
| struct xfrm_usersa_info *p; |
| struct xfrm_usersa_id *id; |
| struct nlmsghdr *nlh; |
| struct sk_buff *skb; |
| unsigned int len = xfrm_sa_len(x); |
| unsigned int headlen; |
| int err; |
| |
| headlen = sizeof(*p); |
| if (c->event == XFRM_MSG_DELSA) { |
| len += nla_total_size(headlen); |
| headlen = sizeof(*id); |
| len += nla_total_size(sizeof(struct xfrm_mark)); |
| } |
| len += NLMSG_ALIGN(headlen); |
| |
| skb = nlmsg_new(len, GFP_ATOMIC); |
| if (skb == NULL) |
| return -ENOMEM; |
| |