![Yossi Kuperman](/assets/img/avatar_default.png)
Current code configures the hardware with a new SA before the state has been
fully initialized. During this time interval, an incoming ESP packet can cause
a crash due to a NULL dereference. More specifically, xfrm_input() considers
the packet as valid, and yet, anti-replay mechanism is not initialized.
Move hardware configuration to the end of xfrm_state_construct(), and mark
the state as valid once the SA is fully initialized.
Fixes: d77e38e612
("xfrm: Add an IPsec hardware offloading API")
Signed-off-by: Aviad Yehezkel <aviadye@mellnaox.com>
Signed-off-by: Aviv Heller <avivh@mellanox.com>
Signed-off-by: Yossi Kuperman <yossiku@mellanox.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
3289 lines
76 KiB
C
3289 lines
76 KiB
C
/* xfrm_user.c: User interface to configure xfrm engine.
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*
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* Copyright (C) 2002 David S. Miller (davem@redhat.com)
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*
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* Changes:
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* Mitsuru KANDA @USAGI
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* Kazunori MIYAZAWA @USAGI
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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* IPv6 support
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*
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*/
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#include <linux/crypto.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/socket.h>
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#include <linux/string.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <linux/pfkeyv2.h>
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#include <linux/ipsec.h>
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#include <linux/init.h>
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#include <linux/security.h>
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#include <net/sock.h>
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#include <net/xfrm.h>
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#include <net/netlink.h>
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#include <net/ah.h>
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#include <linux/uaccess.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <linux/in6.h>
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#endif
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#include <asm/unaligned.h>
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static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
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{
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struct nlattr *rt = attrs[type];
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struct xfrm_algo *algp;
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if (!rt)
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return 0;
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algp = nla_data(rt);
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if (nla_len(rt) < (int)xfrm_alg_len(algp))
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return -EINVAL;
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switch (type) {
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case XFRMA_ALG_AUTH:
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case XFRMA_ALG_CRYPT:
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case XFRMA_ALG_COMP:
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break;
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default:
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return -EINVAL;
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}
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algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
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return 0;
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}
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static int verify_auth_trunc(struct nlattr **attrs)
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{
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struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
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struct xfrm_algo_auth *algp;
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if (!rt)
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return 0;
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algp = nla_data(rt);
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if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
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return -EINVAL;
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algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
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return 0;
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}
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static int verify_aead(struct nlattr **attrs)
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{
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struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
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struct xfrm_algo_aead *algp;
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if (!rt)
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return 0;
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algp = nla_data(rt);
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if (nla_len(rt) < (int)aead_len(algp))
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return -EINVAL;
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algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
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return 0;
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}
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static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
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xfrm_address_t **addrp)
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{
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struct nlattr *rt = attrs[type];
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if (rt && addrp)
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*addrp = nla_data(rt);
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}
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static inline int verify_sec_ctx_len(struct nlattr **attrs)
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{
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struct nlattr *rt = attrs[XFRMA_SEC_CTX];
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struct xfrm_user_sec_ctx *uctx;
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if (!rt)
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return 0;
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uctx = nla_data(rt);
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if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
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return -EINVAL;
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return 0;
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}
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static inline int verify_replay(struct xfrm_usersa_info *p,
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struct nlattr **attrs)
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{
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struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
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struct xfrm_replay_state_esn *rs;
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if (p->flags & XFRM_STATE_ESN) {
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if (!rt)
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return -EINVAL;
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rs = nla_data(rt);
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if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
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return -EINVAL;
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if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
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nla_len(rt) != sizeof(*rs))
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return -EINVAL;
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}
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if (!rt)
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return 0;
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/* As only ESP and AH support ESN feature. */
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if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
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return -EINVAL;
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if (p->replay_window != 0)
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return -EINVAL;
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return 0;
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}
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static int verify_newsa_info(struct xfrm_usersa_info *p,
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struct nlattr **attrs)
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{
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int err;
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err = -EINVAL;
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switch (p->family) {
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case AF_INET:
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break;
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case AF_INET6:
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#if IS_ENABLED(CONFIG_IPV6)
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break;
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#else
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err = -EAFNOSUPPORT;
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goto out;
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#endif
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default:
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goto out;
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}
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err = -EINVAL;
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switch (p->id.proto) {
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case IPPROTO_AH:
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if ((!attrs[XFRMA_ALG_AUTH] &&
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!attrs[XFRMA_ALG_AUTH_TRUNC]) ||
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attrs[XFRMA_ALG_AEAD] ||
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attrs[XFRMA_ALG_CRYPT] ||
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attrs[XFRMA_ALG_COMP] ||
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attrs[XFRMA_TFCPAD])
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goto out;
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break;
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case IPPROTO_ESP:
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if (attrs[XFRMA_ALG_COMP])
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goto out;
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if (!attrs[XFRMA_ALG_AUTH] &&
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!attrs[XFRMA_ALG_AUTH_TRUNC] &&
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!attrs[XFRMA_ALG_CRYPT] &&
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!attrs[XFRMA_ALG_AEAD])
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goto out;
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if ((attrs[XFRMA_ALG_AUTH] ||
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attrs[XFRMA_ALG_AUTH_TRUNC] ||
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attrs[XFRMA_ALG_CRYPT]) &&
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attrs[XFRMA_ALG_AEAD])
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goto out;
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if (attrs[XFRMA_TFCPAD] &&
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p->mode != XFRM_MODE_TUNNEL)
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goto out;
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break;
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case IPPROTO_COMP:
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if (!attrs[XFRMA_ALG_COMP] ||
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attrs[XFRMA_ALG_AEAD] ||
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attrs[XFRMA_ALG_AUTH] ||
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attrs[XFRMA_ALG_AUTH_TRUNC] ||
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attrs[XFRMA_ALG_CRYPT] ||
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attrs[XFRMA_TFCPAD] ||
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(ntohl(p->id.spi) >= 0x10000))
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goto out;
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break;
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#if IS_ENABLED(CONFIG_IPV6)
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case IPPROTO_DSTOPTS:
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case IPPROTO_ROUTING:
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if (attrs[XFRMA_ALG_COMP] ||
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attrs[XFRMA_ALG_AUTH] ||
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attrs[XFRMA_ALG_AUTH_TRUNC] ||
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attrs[XFRMA_ALG_AEAD] ||
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attrs[XFRMA_ALG_CRYPT] ||
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attrs[XFRMA_ENCAP] ||
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attrs[XFRMA_SEC_CTX] ||
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attrs[XFRMA_TFCPAD] ||
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!attrs[XFRMA_COADDR])
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goto out;
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break;
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#endif
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default:
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goto out;
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}
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if ((err = verify_aead(attrs)))
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goto out;
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if ((err = verify_auth_trunc(attrs)))
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goto out;
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if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
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goto out;
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if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
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goto out;
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if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
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goto out;
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if ((err = verify_sec_ctx_len(attrs)))
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goto out;
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if ((err = verify_replay(p, attrs)))
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goto out;
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err = -EINVAL;
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switch (p->mode) {
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case XFRM_MODE_TRANSPORT:
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case XFRM_MODE_TUNNEL:
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case XFRM_MODE_ROUTEOPTIMIZATION:
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case XFRM_MODE_BEET:
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break;
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default:
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goto out;
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}
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err = 0;
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out:
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return err;
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}
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static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
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struct xfrm_algo_desc *(*get_byname)(const char *, int),
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struct nlattr *rta)
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{
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struct xfrm_algo *p, *ualg;
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struct xfrm_algo_desc *algo;
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if (!rta)
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return 0;
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ualg = nla_data(rta);
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algo = get_byname(ualg->alg_name, 1);
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if (!algo)
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return -ENOSYS;
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*props = algo->desc.sadb_alg_id;
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p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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strcpy(p->alg_name, algo->name);
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*algpp = p;
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return 0;
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}
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static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
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{
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struct xfrm_algo *p, *ualg;
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struct xfrm_algo_desc *algo;
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if (!rta)
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return 0;
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ualg = nla_data(rta);
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algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
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if (!algo)
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return -ENOSYS;
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x->props.ealgo = algo->desc.sadb_alg_id;
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p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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strcpy(p->alg_name, algo->name);
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x->ealg = p;
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x->geniv = algo->uinfo.encr.geniv;
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return 0;
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}
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static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
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struct nlattr *rta)
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{
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struct xfrm_algo *ualg;
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struct xfrm_algo_auth *p;
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struct xfrm_algo_desc *algo;
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if (!rta)
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return 0;
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ualg = nla_data(rta);
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algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
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if (!algo)
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return -ENOSYS;
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*props = algo->desc.sadb_alg_id;
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p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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strcpy(p->alg_name, algo->name);
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p->alg_key_len = ualg->alg_key_len;
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p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
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memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
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*algpp = p;
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return 0;
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}
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static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
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struct nlattr *rta)
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{
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struct xfrm_algo_auth *p, *ualg;
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struct xfrm_algo_desc *algo;
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if (!rta)
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return 0;
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ualg = nla_data(rta);
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algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
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if (!algo)
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return -ENOSYS;
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if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
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return -EINVAL;
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*props = algo->desc.sadb_alg_id;
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p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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strcpy(p->alg_name, algo->name);
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if (!p->alg_trunc_len)
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p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
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*algpp = p;
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return 0;
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}
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static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
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{
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struct xfrm_algo_aead *p, *ualg;
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struct xfrm_algo_desc *algo;
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if (!rta)
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return 0;
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ualg = nla_data(rta);
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algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
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if (!algo)
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return -ENOSYS;
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x->props.ealgo = algo->desc.sadb_alg_id;
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p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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strcpy(p->alg_name, algo->name);
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x->aead = p;
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x->geniv = algo->uinfo.aead.geniv;
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return 0;
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}
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static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
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struct nlattr *rp)
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{
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struct xfrm_replay_state_esn *up;
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unsigned int ulen;
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if (!replay_esn || !rp)
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return 0;
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up = nla_data(rp);
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ulen = xfrm_replay_state_esn_len(up);
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/* Check the overall length and the internal bitmap length to avoid
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* potential overflow. */
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if (nla_len(rp) < (int)ulen ||
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xfrm_replay_state_esn_len(replay_esn) != ulen ||
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replay_esn->bmp_len != up->bmp_len)
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return -EINVAL;
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if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
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return -EINVAL;
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return 0;
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}
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static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
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struct xfrm_replay_state_esn **preplay_esn,
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struct nlattr *rta)
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{
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struct xfrm_replay_state_esn *p, *pp, *up;
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unsigned int klen, ulen;
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if (!rta)
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return 0;
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up = nla_data(rta);
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klen = xfrm_replay_state_esn_len(up);
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ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
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p = kzalloc(klen, GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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pp = kzalloc(klen, GFP_KERNEL);
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if (!pp) {
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kfree(p);
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return -ENOMEM;
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}
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memcpy(p, up, ulen);
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memcpy(pp, up, ulen);
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*replay_esn = p;
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*preplay_esn = pp;
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return 0;
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}
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static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
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{
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unsigned int len = 0;
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if (xfrm_ctx) {
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len += sizeof(struct xfrm_user_sec_ctx);
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len += xfrm_ctx->ctx_len;
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}
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return len;
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}
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|
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static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
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{
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memcpy(&x->id, &p->id, sizeof(x->id));
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memcpy(&x->sel, &p->sel, sizeof(x->sel));
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memcpy(&x->lft, &p->lft, sizeof(x->lft));
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x->props.mode = p->mode;
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x->props.replay_window = min_t(unsigned int, p->replay_window,
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sizeof(x->replay.bitmap) * 8);
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x->props.reqid = p->reqid;
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x->props.family = p->family;
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memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
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x->props.flags = p->flags;
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if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
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x->sel.family = p->family;
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}
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|
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/*
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* someday when pfkey also has support, we could have the code
|
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* somehow made shareable and move it to xfrm_state.c - JHS
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*
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*/
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static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
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int update_esn)
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{
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struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
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struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
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struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
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struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
|
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struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
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|
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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 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);
|
|
|
|
if (attrs[XFRMA_OUTPUT_MARK])
|
|
x->props.output_mark = nla_get_u32(attrs[XFRMA_OUTPUT_MARK]);
|
|
|
|
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;
|
|
}
|
|
|
|
/* 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;
|
|
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->props.output_mark) {
|
|
ret = nla_put_u32(skb, XFRMA_OUTPUT_MARK, x->props.output_mark);
|
|
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,
|
|
NULL);
|
|
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)
|
|
return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
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;
|
|
|
|
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 (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,
|
|
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:
|
|
break;
|
|
|
|
case AF_INET6:
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
break;
|
|
#else
|
|
return -EAFNOSUPPORT;
|
|
#endif
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = verify_policy_dir(p->dir);
|
|
if (ret)
|
|
return ret;
|
|
if (p->index && ((p->index & XFRM_POLICY_MAX) != 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;
|
|
|
|
if ((ut[i].mode == XFRM_MODE_TRANSPORT) &&
|
|
(ut[i].family != prev_family))
|
|
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;
|
|
}
|
|
|
|
switch (ut[i].id.proto) {
|
|
case IPPROTO_AH:
|
|
case IPPROTO_ESP:
|
|
case IPPROTO_COMP:
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case IPPROTO_ROUTING:
|
|
case IPPROTO_DSTOPTS:
|
|
#endif
|
|
case IPSEC_PROTO_ANY:
|
|
break;
|
|
default:
|
|
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);
|
|
|
|
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 = {
|
|
.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) {
|
|
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);
|
|
|
|
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 (p->index)
|
|
xp = xfrm_policy_byid(net, mark, 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, 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);
|
|
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;
|
|
|
|
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);
|
|
|
|
err = copy_from_user_policy_type(&type, attrs);
|
|
if (err)
|
|
return err;
|
|
|
|
err = verify_policy_dir(p->dir);
|
|
if (err)
|
|
return err;
|
|
|
|
if (p->index)
|
|
xp = xfrm_policy_byid(net, mark, 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, 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);
|
|
|
|
}
|
|
|
|
kfree(x);
|
|
kfree(xp);
|
|
|
|
return 0;
|
|
|
|
free_state:
|
|
kfree(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_OUTPUT_MARK] = { .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;
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
if (in_compat_syscall())
|
|
return -EOPNOTSUPP;
|
|
#endif
|
|
|
|
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;
|
|
|
|
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.output_mark)
|
|
l += nla_total_size(sizeof(x->props.output_mark));
|
|
|
|
/* 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;
|
|
|
|
nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
|
|
err = -EMSGSIZE;
|
|
if (nlh == NULL)
|
|
goto out_free_skb;
|
|
|
|
p = nlmsg_data(nlh);
|
|
if (c->event == XFRM_MSG_DELSA) {
|
|
struct nlattr *attr;
|
|
|
|
id = nlmsg_data(nlh);
|
|
memset(id, 0, sizeof(*id));
|
|
memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
|
|
id->spi = x->id.spi;
|
|
id->family = x->props.family;
|
|
id->proto = x->id.proto;
|
|
|
|
attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
|
|
err = -EMSGSIZE;
|
|
if (attr == NULL)
|
|
goto out_free_skb;
|
|
|
|
p = nla_data(attr);
|
|
}
|
|
err = copy_to_user_state_extra(x, p, skb);
|
|
if (err)
|
|
goto out_free_skb;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
|
|
return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
|
|
|
|
out_free_skb:
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
static int xfrm_send_state_notify(struct xfrm_state *x, const 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(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
|
|
c->event);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
|
|
struct xfrm_policy *xp)
|
|
{
|
|
return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
|
|
+ nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
|
|
+ nla_total_size(sizeof(struct xfrm_mark))
|
|
+ nla_total_size(xfrm_user_sec_ctx_size(x->security))
|
|
+ userpolicy_type_attrsize();
|
|
}
|
|
|
|
static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
|
|
struct xfrm_tmpl *xt, struct xfrm_policy *xp)
|
|
{
|
|
__u32 seq = xfrm_get_acqseq();
|
|
struct xfrm_user_acquire *ua;
|
|
struct nlmsghdr *nlh;
|
|
int err;
|
|
|
|
nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
ua = nlmsg_data(nlh);
|
|
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, XFRM_POLICY_OUT);
|
|
ua->aalgos = xt->aalgos;
|
|
ua->ealgos = xt->ealgos;
|
|
ua->calgos = xt->calgos;
|
|
ua->seq = x->km.seq = seq;
|
|
|
|
err = copy_to_user_tmpl(xp, skb);
|
|
if (!err)
|
|
err = copy_to_user_state_sec_ctx(x, skb);
|
|
if (!err)
|
|
err = copy_to_user_policy_type(xp->type, skb);
|
|
if (!err)
|
|
err = xfrm_mark_put(skb, &xp->mark);
|
|
if (err) {
|
|
nlmsg_cancel(skb, nlh);
|
|
return err;
|
|
}
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
|
|
struct xfrm_policy *xp)
|
|
{
|
|
struct net *net = xs_net(x);
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
return -ENOMEM;
|
|
|
|
err = build_acquire(skb, x, xt, xp);
|
|
BUG_ON(err < 0);
|
|
|
|
return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
|
|
}
|
|
|
|
/* 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 net *net = sock_net(sk);
|
|
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 IS_ENABLED(CONFIG_IPV6)
|
|
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 (validate_tmpl(nr, ut, p->sel.family))
|
|
return NULL;
|
|
|
|
if (p->dir > XFRM_POLICY_OUT)
|
|
return NULL;
|
|
|
|
xp = xfrm_policy_alloc(net, GFP_ATOMIC);
|
|
if (xp == NULL) {
|
|
*dir = -ENOBUFS;
|
|
return NULL;
|
|
}
|
|
|
|
copy_from_user_policy(xp, p);
|
|
xp->type = XFRM_POLICY_TYPE_MAIN;
|
|
copy_templates(xp, ut, nr);
|
|
|
|
*dir = p->dir;
|
|
|
|
return xp;
|
|
}
|
|
|
|
static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
|
|
{
|
|
return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
|
|
+ nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
|
|
+ nla_total_size(xfrm_user_sec_ctx_size(xp->security))
|
|
+ nla_total_size(sizeof(struct xfrm_mark))
|
|
+ userpolicy_type_attrsize();
|
|
}
|
|
|
|
static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
|
|
int dir, const struct km_event *c)
|
|
{
|
|
struct xfrm_user_polexpire *upe;
|
|
int hard = c->data.hard;
|
|
struct nlmsghdr *nlh;
|
|
int err;
|
|
|
|
nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
upe = nlmsg_data(nlh);
|
|
copy_to_user_policy(xp, &upe->pol, 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) {
|
|
nlmsg_cancel(skb, nlh);
|
|
return err;
|
|
}
|
|
upe->hard = !!hard;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
|
|
{
|
|
struct net *net = xp_net(xp);
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
return -ENOMEM;
|
|
|
|
err = build_polexpire(skb, xp, dir, c);
|
|
BUG_ON(err < 0);
|
|
|
|
return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
|
|
}
|
|
|
|
static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
|
|
{
|
|
unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
|
|
struct net *net = xp_net(xp);
|
|
struct xfrm_userpolicy_info *p;
|
|
struct xfrm_userpolicy_id *id;
|
|
struct nlmsghdr *nlh;
|
|
struct sk_buff *skb;
|
|
unsigned int headlen;
|
|
int err;
|
|
|
|
headlen = sizeof(*p);
|
|
if (c->event == XFRM_MSG_DELPOLICY) {
|
|
len += nla_total_size(headlen);
|
|
headlen = sizeof(*id);
|
|
}
|
|
len += userpolicy_type_attrsize();
|
|
len += nla_total_size(sizeof(struct xfrm_mark));
|
|
len += NLMSG_ALIGN(headlen);
|
|
|
|
skb = nlmsg_new(len, GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
return -ENOMEM;
|
|
|
|
nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
|
|
err = -EMSGSIZE;
|
|
if (nlh == NULL)
|
|
goto out_free_skb;
|
|
|
|
p = nlmsg_data(nlh);
|
|
if (c->event == XFRM_MSG_DELPOLICY) {
|
|
struct nlattr *attr;
|
|
|
|
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));
|
|
|
|
attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
|
|
err = -EMSGSIZE;
|
|
if (attr == NULL)
|
|
goto out_free_skb;
|
|
|
|
p = nla_data(attr);
|
|
}
|
|
|
|
copy_to_user_policy(xp, p, dir);
|
|
err = copy_to_user_tmpl(xp, skb);
|
|
if (!err)
|
|
err = copy_to_user_policy_type(xp->type, skb);
|
|
if (!err)
|
|
err = xfrm_mark_put(skb, &xp->mark);
|
|
if (err)
|
|
goto out_free_skb;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
|
|
return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
|
|
|
|
out_free_skb:
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
static int xfrm_notify_policy_flush(const struct km_event *c)
|
|
{
|
|
struct net *net = c->net;
|
|
struct nlmsghdr *nlh;
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
return -ENOMEM;
|
|
|
|
nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
|
|
err = -EMSGSIZE;
|
|
if (nlh == NULL)
|
|
goto out_free_skb;
|
|
err = copy_to_user_policy_type(c->data.type, skb);
|
|
if (err)
|
|
goto out_free_skb;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
|
|
return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
|
|
|
|
out_free_skb:
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const 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(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
|
|
c->event);
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static inline unsigned int xfrm_report_msgsize(void)
|
|
{
|
|
return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
|
|
}
|
|
|
|
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;
|
|
|
|
nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
ur = nlmsg_data(nlh);
|
|
ur->proto = proto;
|
|
memcpy(&ur->sel, sel, sizeof(ur->sel));
|
|
|
|
if (addr) {
|
|
int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
|
|
if (err) {
|
|
nlmsg_cancel(skb, nlh);
|
|
return err;
|
|
}
|
|
}
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm_send_report(struct net *net, u8 proto,
|
|
struct xfrm_selector *sel, xfrm_address_t *addr)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
return -ENOMEM;
|
|
|
|
err = build_report(skb, proto, sel, addr);
|
|
BUG_ON(err < 0);
|
|
|
|
return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
|
|
}
|
|
|
|
static inline unsigned int xfrm_mapping_msgsize(void)
|
|
{
|
|
return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
|
|
}
|
|
|
|
static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
|
|
xfrm_address_t *new_saddr, __be16 new_sport)
|
|
{
|
|
struct xfrm_user_mapping *um;
|
|
struct nlmsghdr *nlh;
|
|
|
|
nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
um = nlmsg_data(nlh);
|
|
|
|
memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
|
|
um->id.spi = x->id.spi;
|
|
um->id.family = x->props.family;
|
|
um->id.proto = x->id.proto;
|
|
memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
|
|
memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
|
|
um->new_sport = new_sport;
|
|
um->old_sport = x->encap->encap_sport;
|
|
um->reqid = x->props.reqid;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
|
|
__be16 sport)
|
|
{
|
|
struct net *net = xs_net(x);
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
if (x->id.proto != IPPROTO_ESP)
|
|
return -EINVAL;
|
|
|
|
if (!x->encap)
|
|
return -EINVAL;
|
|
|
|
skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
return -ENOMEM;
|
|
|
|
err = build_mapping(skb, x, ipaddr, sport);
|
|
BUG_ON(err < 0);
|
|
|
|
return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
|
|
}
|
|
|
|
static bool xfrm_is_alive(const struct km_event *c)
|
|
{
|
|
return (bool)xfrm_acquire_is_on(c->net);
|
|
}
|
|
|
|
static struct xfrm_mgr netlink_mgr = {
|
|
.notify = xfrm_send_state_notify,
|
|
.acquire = xfrm_send_acquire,
|
|
.compile_policy = xfrm_compile_policy,
|
|
.notify_policy = xfrm_send_policy_notify,
|
|
.report = xfrm_send_report,
|
|
.migrate = xfrm_send_migrate,
|
|
.new_mapping = xfrm_send_mapping,
|
|
.is_alive = xfrm_is_alive,
|
|
};
|
|
|
|
static int __net_init xfrm_user_net_init(struct net *net)
|
|
{
|
|
struct sock *nlsk;
|
|
struct netlink_kernel_cfg cfg = {
|
|
.groups = XFRMNLGRP_MAX,
|
|
.input = xfrm_netlink_rcv,
|
|
};
|
|
|
|
nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
|
|
if (nlsk == NULL)
|
|
return -ENOMEM;
|
|
net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
|
|
rcu_assign_pointer(net->xfrm.nlsk, nlsk);
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
|
|
{
|
|
struct net *net;
|
|
list_for_each_entry(net, net_exit_list, exit_list)
|
|
RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
|
|
synchronize_net();
|
|
list_for_each_entry(net, net_exit_list, exit_list)
|
|
netlink_kernel_release(net->xfrm.nlsk_stash);
|
|
}
|
|
|
|
static struct pernet_operations xfrm_user_net_ops = {
|
|
.init = xfrm_user_net_init,
|
|
.exit_batch = xfrm_user_net_exit,
|
|
};
|
|
|
|
static int __init xfrm_user_init(void)
|
|
{
|
|
int rv;
|
|
|
|
printk(KERN_INFO "Initializing XFRM netlink socket\n");
|
|
|
|
rv = register_pernet_subsys(&xfrm_user_net_ops);
|
|
if (rv < 0)
|
|
return rv;
|
|
rv = xfrm_register_km(&netlink_mgr);
|
|
if (rv < 0)
|
|
unregister_pernet_subsys(&xfrm_user_net_ops);
|
|
return rv;
|
|
}
|
|
|
|
static void __exit xfrm_user_exit(void)
|
|
{
|
|
xfrm_unregister_km(&netlink_mgr);
|
|
unregister_pernet_subsys(&xfrm_user_net_ops);
|
|
}
|
|
|
|
module_init(xfrm_user_init);
|
|
module_exit(xfrm_user_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
|
|
|