#include <linux/compat.h>
#include <linux/crypto.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
#include <linux/init.h>
#include <linux/security.h>
#include <net/sock.h>
#include <net/xfrm.h>
#include <net/netlink.h>
#include <net/ah.h>
#include <linux/uaccess.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <linux/in6.h>
#endif
#include <linux/unaligned.h>
static struct sock *xfrm_net_nlsk(const struct net *net, const struct sk_buff *skb)
{
const struct sock *sk = NETLINK_CB(skb).sk;
return rcu_dereference_protected(net->xfrm.nlsk, sk->sk_net_refcnt);
}
static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type,
struct netlink_ext_ack *extack)
{
struct nlattr *rt = attrs[type];
struct xfrm_algo *algp;
if (!rt)
return 0;
algp = nla_data(rt);
if (nla_len(rt) < (int)xfrm_alg_len(algp)) {
NL_SET_ERR_MSG(extack, "Invalid AUTH/CRYPT/COMP attribute length");
return -EINVAL;
}
switch (type) {
case XFRMA_ALG_AUTH:
case XFRMA_ALG_CRYPT:
case XFRMA_ALG_COMP:
break;
default:
NL_SET_ERR_MSG(extack, "Invalid algorithm attribute type");
return -EINVAL;
}
algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
return 0;
}
static int verify_auth_trunc(struct nlattr **attrs,
struct netlink_ext_ack *extack)
{
struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
struct xfrm_algo_auth *algp;
if (!rt)
return 0;
algp = nla_data(rt);
if (nla_len(rt) < (int)xfrm_alg_auth_len(algp)) {
NL_SET_ERR_MSG(extack, "Invalid AUTH_TRUNC attribute length");
return -EINVAL;
}
algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
return 0;
}
static int verify_aead(struct nlattr **attrs, struct netlink_ext_ack *extack)
{
struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
struct xfrm_algo_aead *algp;
if (!rt)
return 0;
algp = nla_data(rt);
if (nla_len(rt) < (int)aead_len(algp)) {
NL_SET_ERR_MSG(extack, "Invalid AEAD attribute length");
return -EINVAL;
}
algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
return 0;
}
static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
xfrm_address_t **addrp)
{
struct nlattr *rt = attrs[type];
if (rt && addrp)
*addrp = nla_data(rt);
}
static inline int verify_sec_ctx_len(struct nlattr **attrs, struct netlink_ext_ack *extack)
{
struct nlattr *rt = attrs[XFRMA_SEC_CTX];
struct xfrm_user_sec_ctx *uctx;
if (!rt)
return 0;
uctx = nla_data(rt);
if (uctx->len > nla_len(rt) ||
uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) {
NL_SET_ERR_MSG(extack, "Invalid security context length");
return -EINVAL;
}
return 0;
}
static inline int verify_replay(struct xfrm_usersa_info *p,
struct nlattr **attrs, u8 sa_dir,
struct netlink_ext_ack *extack)
{
struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
struct xfrm_replay_state_esn *rs;
if (!rt) {
if (p->flags & XFRM_STATE_ESN) {
NL_SET_ERR_MSG(extack, "Missing required attribute for ESN");
return -EINVAL;
}
return 0;
}
rs = nla_data(rt);
if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) {
NL_SET_ERR_MSG(extack, "ESN bitmap length must be <= 128");
return -EINVAL;
}
if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
nla_len(rt) != sizeof(*rs)) {
NL_SET_ERR_MSG(extack, "ESN attribute is too short to fit the full bitmap length");
return -EINVAL;
}
if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) {
NL_SET_ERR_MSG(extack, "ESN only supported for ESP and AH");
return -EINVAL;
}
if (p->replay_window != 0) {
NL_SET_ERR_MSG(extack, "ESN not compatible with legacy replay_window");
return -EINVAL;
}
if (sa_dir == XFRM_SA_DIR_OUT) {
if (rs->replay_window) {
NL_SET_ERR_MSG(extack, "Replay window should be 0 for output SA");
return -EINVAL;
}
if (rs->seq || rs->seq_hi) {
NL_SET_ERR_MSG(extack,
"Replay seq and seq_hi should be 0 for output SA");
return -EINVAL;
}
if (!(p->flags & XFRM_STATE_ESN)) {
if (rs->oseq_hi) {
NL_SET_ERR_MSG(
extack,
"Replay oseq_hi should be 0 in non-ESN mode for output SA");
return -EINVAL;
}
if (rs->oseq == U32_MAX) {
NL_SET_ERR_MSG(
extack,
"Replay oseq should be less than 0xFFFFFFFF in non-ESN mode for output SA");
return -EINVAL;
}
} else {
if (rs->oseq == U32_MAX && rs->oseq_hi == U32_MAX) {
NL_SET_ERR_MSG(
extack,
"Replay oseq and oseq_hi should be less than 0xFFFFFFFF for output SA");
return -EINVAL;
}
}
if (rs->bmp_len) {
NL_SET_ERR_MSG(extack, "Replay bmp_len should 0 for output SA");
return -EINVAL;
}
}
if (sa_dir == XFRM_SA_DIR_IN) {
if (rs->oseq || rs->oseq_hi) {
NL_SET_ERR_MSG(extack,
"Replay oseq and oseq_hi should be 0 for input SA");
return -EINVAL;
}
if (!(p->flags & XFRM_STATE_ESN)) {
if (rs->seq_hi) {
NL_SET_ERR_MSG(
extack,
"Replay seq_hi should be 0 in non-ESN mode for input SA");
return -EINVAL;
}
if (rs->seq == U32_MAX) {
NL_SET_ERR_MSG(
extack,
"Replay seq should be less than 0xFFFFFFFF in non-ESN mode for input SA");
return -EINVAL;
}
} else {
if (rs->seq == U32_MAX && rs->seq_hi == U32_MAX) {
NL_SET_ERR_MSG(
extack,
"Replay seq and seq_hi should be less than 0xFFFFFFFF for input SA");
return -EINVAL;
}
}
}
return 0;
}
static int verify_newsa_info(struct xfrm_usersa_info *p,
struct nlattr **attrs,
struct netlink_ext_ack *extack)
{
int err;
u8 sa_dir = nla_get_u8_default(attrs[XFRMA_SA_DIR], 0);
u16 family = p->sel.family;
err = -EINVAL;
switch (p->family) {
case AF_INET:
break;
case AF_INET6:
#if IS_ENABLED(CONFIG_IPV6)
break;
#else
err = -EAFNOSUPPORT;
NL_SET_ERR_MSG(extack, "IPv6 support disabled");
goto out;
#endif
default:
NL_SET_ERR_MSG(extack, "Invalid address family");
goto out;
}
if (!family && !(p->flags & XFRM_STATE_AF_UNSPEC))
family = p->family;
switch (family) {
case AF_UNSPEC:
break;
case AF_INET:
if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
goto out;
}
break;
case AF_INET6:
#if IS_ENABLED(CONFIG_IPV6)
if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
goto out;
}
break;
#else
NL_SET_ERR_MSG(extack, "IPv6 support disabled");
err = -EAFNOSUPPORT;
goto out;
#endif
default:
NL_SET_ERR_MSG(extack, "Invalid address family in selector");
goto out;
}
err = -EINVAL;
switch (p->id.proto) {
case IPPROTO_AH:
if (!attrs[XFRMA_ALG_AUTH] &&
!attrs[XFRMA_ALG_AUTH_TRUNC]) {
NL_SET_ERR_MSG(extack, "Missing required attribute for AH: AUTH_TRUNC or AUTH");
goto out;
}
if (attrs[XFRMA_ALG_AEAD] ||
attrs[XFRMA_ALG_CRYPT] ||
attrs[XFRMA_ALG_COMP] ||
attrs[XFRMA_TFCPAD]) {
NL_SET_ERR_MSG(extack, "Invalid attributes for AH: AEAD, CRYPT, COMP, TFCPAD");
goto out;
}
break;
case IPPROTO_ESP:
if (attrs[XFRMA_ALG_COMP]) {
NL_SET_ERR_MSG(extack, "Invalid attribute for ESP: COMP");
goto out;
}
if (!attrs[XFRMA_ALG_AUTH] &&
!attrs[XFRMA_ALG_AUTH_TRUNC] &&
!attrs[XFRMA_ALG_CRYPT] &&
!attrs[XFRMA_ALG_AEAD]) {
NL_SET_ERR_MSG(extack, "Missing required attribute for ESP: at least one of AUTH, AUTH_TRUNC, CRYPT, AEAD");
goto out;
}
if ((attrs[XFRMA_ALG_AUTH] ||
attrs[XFRMA_ALG_AUTH_TRUNC] ||
attrs[XFRMA_ALG_CRYPT]) &&
attrs[XFRMA_ALG_AEAD]) {
NL_SET_ERR_MSG(extack, "Invalid attribute combination for ESP: AEAD can't be used with AUTH, AUTH_TRUNC, CRYPT");
goto out;
}
if (attrs[XFRMA_TFCPAD] &&
p->mode != XFRM_MODE_TUNNEL) {
NL_SET_ERR_MSG(extack, "TFC padding can only be used in tunnel mode");
goto out;
}
if ((attrs[XFRMA_IPTFS_DROP_TIME] ||
attrs[XFRMA_IPTFS_REORDER_WINDOW] ||
attrs[XFRMA_IPTFS_DONT_FRAG] ||
attrs[XFRMA_IPTFS_INIT_DELAY] ||
attrs[XFRMA_IPTFS_MAX_QSIZE] ||
attrs[XFRMA_IPTFS_PKT_SIZE]) &&
p->mode != XFRM_MODE_IPTFS) {
NL_SET_ERR_MSG(extack, "IP-TFS options can only be used in IP-TFS mode");
goto out;
}
break;
case IPPROTO_COMP:
if (!attrs[XFRMA_ALG_COMP]) {
NL_SET_ERR_MSG(extack, "Missing required attribute for COMP: COMP");
goto out;
}
if (attrs[XFRMA_ALG_AEAD] ||
attrs[XFRMA_ALG_AUTH] ||
attrs[XFRMA_ALG_AUTH_TRUNC] ||
attrs[XFRMA_ALG_CRYPT] ||
attrs[XFRMA_TFCPAD]) {
NL_SET_ERR_MSG(extack, "Invalid attributes for COMP: AEAD, AUTH, AUTH_TRUNC, CRYPT, TFCPAD");
goto out;
}
if (ntohl(p->id.spi) >= 0x10000) {
NL_SET_ERR_MSG(extack, "SPI is too large for COMP (must be < 0x10000)");
goto out;
}
break;
#if IS_ENABLED(CONFIG_IPV6)
case IPPROTO_DSTOPTS:
case IPPROTO_ROUTING:
if (attrs[XFRMA_ALG_COMP] ||
attrs[XFRMA_ALG_AUTH] ||
attrs[XFRMA_ALG_AUTH_TRUNC] ||
attrs[XFRMA_ALG_AEAD] ||
attrs[XFRMA_ALG_CRYPT] ||
attrs[XFRMA_ENCAP] ||
attrs[XFRMA_SEC_CTX] ||
attrs[XFRMA_TFCPAD]) {
NL_SET_ERR_MSG(extack, "Invalid attributes for DSTOPTS/ROUTING");
goto out;
}
if (!attrs[XFRMA_COADDR]) {
NL_SET_ERR_MSG(extack, "Missing required COADDR attribute for DSTOPTS/ROUTING");
goto out;
}
break;
#endif
default:
NL_SET_ERR_MSG(extack, "Unsupported protocol");
goto out;
}
if ((err = verify_aead(attrs, extack)))
goto out;
if ((err = verify_auth_trunc(attrs, extack)))
goto out;
if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH, extack)))
goto out;
if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT, extack)))
goto out;
if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP, extack)))
goto out;
if ((err = verify_sec_ctx_len(attrs, extack)))
goto out;
if ((err = verify_replay(p, attrs, sa_dir, extack)))
goto out;
err = -EINVAL;
switch (p->mode) {
case XFRM_MODE_TRANSPORT:
case XFRM_MODE_TUNNEL:
case XFRM_MODE_ROUTEOPTIMIZATION:
case XFRM_MODE_BEET:
break;
case XFRM_MODE_IPTFS:
if (p->id.proto != IPPROTO_ESP) {
NL_SET_ERR_MSG(extack, "IP-TFS mode only supported with ESP");
goto out;
}
if (sa_dir == 0) {
NL_SET_ERR_MSG(extack, "IP-TFS mode requires in or out direction attribute");
goto out;
}
break;
default:
NL_SET_ERR_MSG(extack, "Unsupported mode");
goto out;
}
err = 0;
if (attrs[XFRMA_MTIMER_THRESH]) {
if (!attrs[XFRMA_ENCAP]) {
NL_SET_ERR_MSG(extack, "MTIMER_THRESH attribute can only be set on ENCAP states");
err = -EINVAL;
goto out;
}
if (sa_dir == XFRM_SA_DIR_OUT) {
NL_SET_ERR_MSG(extack,
"MTIMER_THRESH attribute should not be set on output SA");
err = -EINVAL;
goto out;
}
}
if (sa_dir == XFRM_SA_DIR_OUT) {
if (p->flags & XFRM_STATE_DECAP_DSCP) {
NL_SET_ERR_MSG(extack, "Flag DECAP_DSCP should not be set for output SA");
err = -EINVAL;
goto out;
}
if (p->flags & XFRM_STATE_ICMP) {
NL_SET_ERR_MSG(extack, "Flag ICMP should not be set for output SA");
err = -EINVAL;
goto out;
}
if (p->flags & XFRM_STATE_WILDRECV) {
NL_SET_ERR_MSG(extack, "Flag WILDRECV should not be set for output SA");
err = -EINVAL;
goto out;
}
if (p->replay_window) {
NL_SET_ERR_MSG(extack, "Replay window should be 0 for output SA");
err = -EINVAL;
goto out;
}
if (attrs[XFRMA_IPTFS_DROP_TIME]) {
NL_SET_ERR_MSG(extack, "IP-TFS drop time should not be set for output SA");
err = -EINVAL;
goto out;
}
if (attrs[XFRMA_IPTFS_REORDER_WINDOW]) {
NL_SET_ERR_MSG(extack, "IP-TFS reorder window should not be set for output SA");
err = -EINVAL;
goto out;
}
if (attrs[XFRMA_REPLAY_VAL]) {
struct xfrm_replay_state *replay;
replay = nla_data(attrs[XFRMA_REPLAY_VAL]);
if (replay->seq || replay->bitmap) {
NL_SET_ERR_MSG(extack,
"Replay seq and bitmap should be 0 for output SA");
err = -EINVAL;
goto out;
}
}
}
if (sa_dir == XFRM_SA_DIR_IN) {
if (p->flags & XFRM_STATE_NOPMTUDISC) {
NL_SET_ERR_MSG(extack, "Flag NOPMTUDISC should not be set for input SA");
err = -EINVAL;
goto out;
}
if (attrs[XFRMA_SA_EXTRA_FLAGS]) {
u32 xflags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
if (xflags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP) {
NL_SET_ERR_MSG(extack, "Flag DONT_ENCAP_DSCP should not be set for input SA");
err = -EINVAL;
goto out;
}
if (xflags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP) {
NL_SET_ERR_MSG(extack, "Flag OSEQ_MAY_WRAP should not be set for input SA");
err = -EINVAL;
goto out;
}
}
if (attrs[XFRMA_IPTFS_DONT_FRAG]) {
NL_SET_ERR_MSG(extack, "IP-TFS don't fragment should not be set for input SA");
err = -EINVAL;
goto out;
}
if (attrs[XFRMA_IPTFS_INIT_DELAY]) {
NL_SET_ERR_MSG(extack, "IP-TFS initial delay should not be set for input SA");
err = -EINVAL;
goto out;
}
if (attrs[XFRMA_IPTFS_MAX_QSIZE]) {
NL_SET_ERR_MSG(extack, "IP-TFS max queue size should not be set for input SA");
err = -EINVAL;
goto out;
}
if (attrs[XFRMA_IPTFS_PKT_SIZE]) {
NL_SET_ERR_MSG(extack, "IP-TFS packet size should not be set for input SA");
err = -EINVAL;
goto out;
}
}
if (!sa_dir && attrs[XFRMA_SA_PCPU]) {
NL_SET_ERR_MSG(extack, "SA_PCPU only supported with SA_DIR");
err = -EINVAL;
goto out;
}
out:
return err;
}
static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
struct xfrm_algo_desc *(*get_byname)(const char *, int),
struct nlattr *rta, struct netlink_ext_ack *extack)
{
struct xfrm_algo *p, *ualg;
struct xfrm_algo_desc *algo;
if (!rta)
return 0;
ualg = nla_data(rta);
algo = get_byname(ualg->alg_name, 1);
if (!algo) {
NL_SET_ERR_MSG(extack, "Requested COMP algorithm not found");
return -ENOSYS;
}
*props = algo->desc.sadb_alg_id;
p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
if (!p)
return -ENOMEM;
strscpy(p->alg_name, algo->name);
*algpp = p;
return 0;
}
static int attach_crypt(struct xfrm_state *x, struct nlattr *rta,
struct netlink_ext_ack *extack)
{
struct xfrm_algo *p, *ualg;
struct xfrm_algo_desc *algo;
if (!rta)
return 0;
ualg = nla_data(rta);
algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
if (!algo) {
NL_SET_ERR_MSG(extack, "Requested CRYPT algorithm not found");
return -ENOSYS;
}
x->props.ealgo = algo->desc.sadb_alg_id;
p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
if (!p)
return -ENOMEM;
strscpy(p->alg_name, algo->name);
x->ealg = p;
x->geniv = algo->uinfo.encr.geniv;
return 0;
}
static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
struct nlattr *rta, struct netlink_ext_ack *extack)
{
struct xfrm_algo *ualg;
struct xfrm_algo_auth *p;
struct xfrm_algo_desc *algo;
if (!rta)
return 0;
ualg = nla_data(rta);
algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
if (!algo) {
NL_SET_ERR_MSG(extack, "Requested AUTH algorithm not found");
return -ENOSYS;
}
*props = algo->desc.sadb_alg_id;
p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
if (!p)
return -ENOMEM;
strscpy(p->alg_name, algo->name);
p->alg_key_len = ualg->alg_key_len;
p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
*algpp = p;
return 0;
}
static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
struct nlattr *rta, struct netlink_ext_ack *extack)
{
struct xfrm_algo_auth *p, *ualg;
struct xfrm_algo_desc *algo;
if (!rta)
return 0;
ualg = nla_data(rta);
algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
if (!algo) {
NL_SET_ERR_MSG(extack, "Requested AUTH_TRUNC algorithm not found");
return -ENOSYS;
}
if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) {
NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
return -EINVAL;
}
*props = algo->desc.sadb_alg_id;
p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
if (!p)
return -ENOMEM;
strscpy(p->alg_name, algo->name);
if (!p->alg_trunc_len)
p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
*algpp = p;
return 0;
}
static int attach_aead(struct xfrm_state *x, struct nlattr *rta,
struct netlink_ext_ack *extack)
{
struct xfrm_algo_aead *p, *ualg;
struct xfrm_algo_desc *algo;
if (!rta)
return 0;
ualg = nla_data(rta);
algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
if (!algo) {
NL_SET_ERR_MSG(extack, "Requested AEAD algorithm not found");
return -ENOSYS;
}
x->props.ealgo = algo->desc.sadb_alg_id;
p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
if (!p)
return -ENOMEM;
strscpy(p->alg_name, algo->name);
x->aead = p;
x->geniv = algo->uinfo.aead.geniv;
return 0;
}
static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
struct nlattr *rp,
struct netlink_ext_ack *extack)
{
struct xfrm_replay_state_esn *up;
unsigned int ulen;
if (!replay_esn || !rp)
return 0;
up = nla_data(rp);
ulen = xfrm_replay_state_esn_len(up);
if (nla_len(rp) < (int)ulen) {
NL_SET_ERR_MSG(extack, "ESN attribute is too short");
return -EINVAL;
}
if (xfrm_replay_state_esn_len(replay_esn) != ulen) {
NL_SET_ERR_MSG(extack, "New ESN size doesn't match the existing SA's ESN size");
return -EINVAL;
}
if (replay_esn->bmp_len != up->bmp_len) {
NL_SET_ERR_MSG(extack, "New ESN bitmap size doesn't match the existing SA's ESN bitmap");
return -EINVAL;
}
if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) {
NL_SET_ERR_MSG(extack, "ESN replay window is longer than the bitmap");
return -EINVAL;
}
return 0;
}
static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
struct xfrm_replay_state_esn **preplay_esn,
struct nlattr *rta)
{
struct xfrm_replay_state_esn *p, *pp, *up;
unsigned int klen, ulen;
if (!rta)
return 0;
up = nla_data(rta);
klen = xfrm_replay_state_esn_len(up);
ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
p = kzalloc(klen, GFP_KERNEL);
if (!p)
return -ENOMEM;
pp = kzalloc(klen, GFP_KERNEL);
if (!pp) {
kfree(p);
return -ENOMEM;
}
memcpy(p, up, ulen);
memcpy(pp, up, ulen);
*replay_esn = p;
*preplay_esn = pp;
return 0;
}
static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
{
unsigned int len = 0;
if (xfrm_ctx) {
len += sizeof(struct xfrm_user_sec_ctx);
len += xfrm_ctx->ctx_len;
}
return len;
}
static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
{
memcpy(&x->id, &p->id, sizeof(x->id));
memcpy(&x->sel, &p->sel, sizeof(x->sel));
memcpy(&x->lft, &p->lft, sizeof(x->lft));
x->props.mode = p->mode;
x->props.replay_window = min_t(unsigned int, p->replay_window,
sizeof(x->replay.bitmap) * 8);
x->props.reqid = p->reqid;
x->props.family = p->family;
memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
x->props.flags = p->flags;
if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
x->sel.family = p->family;
}
static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
int update_esn)
{
struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH];
if (re && x->replay_esn && x->preplay_esn) {
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);
if (mt)
x->mapping_maxage = nla_get_u32(mt);
}
static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
{
if (attrs[XFRMA_SET_MARK]) {
m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
m->m = nla_get_u32_default(attrs[XFRMA_SET_MARK_MASK],
0xffffffff);
} else {
m->v = m->m = 0;
}
}
static struct xfrm_state *xfrm_state_construct(struct net *net,
struct xfrm_usersa_info *p,
struct nlattr **attrs,
int *errp,
struct netlink_ext_ack *extack)
{
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_ENCAP]) {
x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
sizeof(*x->encap), GFP_KERNEL);
if (x->encap == NULL)
goto error;
}
if (attrs[XFRMA_COADDR]) {
x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
sizeof(*x->coaddr), GFP_KERNEL);
if (x->coaddr == NULL)
goto error;
}
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], extack)))
goto error;
if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
attrs[XFRMA_ALG_AUTH_TRUNC], extack)))
goto error;
if (!x->props.aalgo) {
if ((err = attach_auth(&x->aalg, &x->props.aalgo,
attrs[XFRMA_ALG_AUTH], extack)))
goto error;
}
if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT], extack)))
goto error;
if ((err = attach_one_algo(&x->calg, &x->props.calgo,
xfrm_calg_get_byname,
attrs[XFRMA_ALG_COMP], extack)))
goto error;
if (attrs[XFRMA_TFCPAD])
x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
xfrm_mark_get(attrs, &x->mark);
xfrm_smark_init(attrs, &x->props.smark);
if (attrs[XFRMA_IF_ID])
x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
if (attrs[XFRMA_SA_DIR])
x->dir = nla_get_u8(attrs[XFRMA_SA_DIR]);
if (attrs[XFRMA_NAT_KEEPALIVE_INTERVAL])
x->nat_keepalive_interval =
nla_get_u32(attrs[XFRMA_NAT_KEEPALIVE_INTERVAL]);
if (attrs[XFRMA_SA_PCPU]) {
x->pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
if (x->pcpu_num >= num_possible_cpus()) {
err = -ERANGE;
NL_SET_ERR_MSG(extack, "pCPU number too big");
goto error;
}
}
err = __xfrm_init_state(x, extack);
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;
x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
if ((err = xfrm_init_replay(x, extack)))
goto error;
xfrm_update_ae_params(x, attrs, 0);
xfrm_set_type_offload(x, attrs[XFRMA_OFFLOAD_DEV]);
if (attrs[XFRMA_OFFLOAD_DEV]) {
err = xfrm_dev_state_add(net, x,
nla_data(attrs[XFRMA_OFFLOAD_DEV]),
extack);
if (err)
goto error;
}
if (x->mode_cbs && x->mode_cbs->user_init) {
err = x->mode_cbs->user_init(net, x, attrs, extack);
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 netlink_ext_ack *extack)
{
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, extack);
if (err)
return err;
x = xfrm_state_construct(net, p, attrs, &err, extack);
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 netlink_ext_ack *extack)
{
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)) {
NL_SET_ERR_MSG(extack, "SA is in use by tunnels");
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));
if (x->xso.dev)
xfrm_dev_state_update_stats(x);
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_dev_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;
if (xso->dir == XFRM_DEV_OFFLOAD_IN)
xuo->flags = XFRM_OFFLOAD_INBOUND;
if (xso->type == XFRM_DEV_OFFLOAD_PACKET)
xuo->flags |= XFRM_OFFLOAD_PACKET;
return 0;
}
static bool xfrm_redact(void)
{
return IS_ENABLED(CONFIG_SECURITY) &&
security_locked_down(LOCKDOWN_XFRM_SECRET);
}
static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
{
struct xfrm_algo *algo;
struct xfrm_algo_auth *ap;
struct nlattr *nla;
bool redact_secret = xfrm_redact();
nla = nla_reserve(skb, XFRMA_ALG_AUTH,
sizeof(*algo) + (auth->alg_key_len + 7) / 8);
if (!nla)
return -EMSGSIZE;
algo = nla_data(nla);
strscpy_pad(algo->alg_name, auth->alg_name);
if (redact_secret && auth->alg_key_len)
memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8);
else
memcpy(algo->alg_key, auth->alg_key,
(auth->alg_key_len + 7) / 8);
algo->alg_key_len = auth->alg_key_len;
nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth));
if (!nla)
return -EMSGSIZE;
ap = nla_data(nla);
strscpy_pad(ap->alg_name, auth->alg_name);
ap->alg_key_len = auth->alg_key_len;
ap->alg_trunc_len = auth->alg_trunc_len;
if (redact_secret && auth->alg_key_len)
memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
else
memcpy(ap->alg_key, auth->alg_key,
(auth->alg_key_len + 7) / 8);
return 0;
}
static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb)
{
struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead));
struct xfrm_algo_aead *ap;
bool redact_secret = xfrm_redact();
if (!nla)
return -EMSGSIZE;
ap = nla_data(nla);
strscpy_pad(ap->alg_name, aead->alg_name);
ap->alg_key_len = aead->alg_key_len;
ap->alg_icv_len = aead->alg_icv_len;
if (redact_secret && aead->alg_key_len)
memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8);
else
memcpy(ap->alg_key, aead->alg_key,
(aead->alg_key_len + 7) / 8);
return 0;
}
static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb)
{
struct xfrm_algo *ap;
bool redact_secret = xfrm_redact();
struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT,
xfrm_alg_len(ealg));
if (!nla)
return -EMSGSIZE;
ap = nla_data(nla);
strscpy_pad(ap->alg_name, ealg->alg_name);
ap->alg_key_len = ealg->alg_key_len;
if (redact_secret && ealg->alg_key_len)
memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8);
else
memcpy(ap->alg_key, ealg->alg_key,
(ealg->alg_key_len + 7) / 8);
return 0;
}
static int copy_to_user_calg(struct xfrm_algo *calg, struct sk_buff *skb)
{
struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_COMP, sizeof(*calg));
struct xfrm_algo *ap;
if (!nla)
return -EMSGSIZE;
ap = nla_data(nla);
strscpy_pad(ap->alg_name, calg->alg_name);
ap->alg_key_len = 0;
return 0;
}
static int copy_to_user_encap(struct xfrm_encap_tmpl *ep, struct sk_buff *skb)
{
struct nlattr *nla = nla_reserve(skb, XFRMA_ENCAP, sizeof(*ep));
struct xfrm_encap_tmpl *uep;
if (!nla)
return -EMSGSIZE;
uep = nla_data(nla);
memset(uep, 0, sizeof(*uep));
uep->encap_type = ep->encap_type;
uep->encap_sport = ep->encap_sport;
uep->encap_dport = ep->encap_dport;
uep->encap_oa = ep->encap_oa;
return 0;
}
static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
{
int ret = 0;
if (m->v | m->m) {
ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
if (!ret)
ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
}
return ret;
}
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 = copy_to_user_aead(x->aead, skb);
if (ret)
goto out;
}
if (x->aalg) {
ret = copy_to_user_auth(x->aalg, skb);
if (ret)
goto out;
}
if (x->ealg) {
ret = copy_to_user_ealg(x->ealg, skb);
if (ret)
goto out;
}
if (x->calg) {
ret = copy_to_user_calg(x->calg, skb);
if (ret)
goto out;
}
if (x->encap) {
ret = copy_to_user_encap(x->encap, skb);
if (ret)
goto out;
}
if (x->tfcpad) {
ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
if (ret)
goto out;
}
ret = xfrm_mark_put(skb, &x->mark);
if (ret)
goto out;
ret = xfrm_smark_put(skb, &x->props.smark);
if (ret)
goto out;
if (x->replay_esn)
ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
xfrm_replay_state_esn_len(x->replay_esn),
x->replay_esn);
else
ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
&x->replay);
if (ret)
goto out;
if(x->xso.dev)
ret = copy_user_offload(&x->xso, skb);
if (ret)
goto out;
if (x->if_id) {
ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
if (ret)
goto out;
}
if (x->security) {
ret = copy_sec_ctx(x->security, skb);
if (ret)
goto out;
}
if (x->mode_cbs && x->mode_cbs->copy_to_user)
ret = x->mode_cbs->copy_to_user(x, skb);
if (ret)
goto out;
if (x->mapping_maxage) {
ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage);
if (ret)
goto out;
}
if (x->pcpu_num != UINT_MAX) {
ret = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
if (ret)
goto out;
}
if (x->dir)
ret = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
if (x->nat_keepalive_interval) {
ret = nla_put_u32(skb, XFRMA_NAT_KEEPALIVE_INTERVAL,
x->nat_keepalive_interval);
if (ret)
goto out;
}
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_translator *xtr;
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);
xtr = xfrm_get_translator();
if (xtr) {
err = xtr->alloc_compat(skb, nlh);
xfrm_put_translator(xtr);
if (err) {
nlmsg_cancel(skb, nlh);
return err;
}
}
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 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_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
xfrma_policy, cb->extack);
if (err < 0)
return err;
if (attrs[XFRMA_ADDRESS_FILTER]) {
filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
sizeof(*filter), GFP_KERNEL);
if (filter == NULL)
return -ENOMEM;
if (filter->splen > (sizeof(xfrm_address_t) << 3) ||
filter->dplen > (sizeof(xfrm_address_t) << 3)) {
kfree(filter);
return -EINVAL;
}
}
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;
}
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);
struct xfrm_translator *xtr;
if (!nlsk) {
kfree_skb(skb);
return -EPIPE;
}
xtr = xfrm_get_translator();
if (xtr) {
int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
xfrm_put_translator(xtr);
if (err) {
kfree_skb(skb);
return err;
}
}
return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
}
static inline unsigned int xfrm_spdinfo_msgsize(void)
{
return NLMSG_ALIGN(4)
+ nla_total_size(sizeof(struct xfrmu_spdinfo))
+ nla_total_size(sizeof(struct xfrmu_spdhinfo))
+ nla_total_size(sizeof(struct xfrmu_spdhthresh))
+ nla_total_size(sizeof(struct xfrmu_spdhthresh));
}
static int build_spdinfo(struct sk_buff *skb, struct net *net,
u32 portid, u32 seq, u32 flags)
{
struct xfrmk_spdinfo si;
struct xfrmu_spdinfo spc;
struct xfrmu_spdhinfo sph;
struct xfrmu_spdhthresh spt4, spt6;
struct nlmsghdr *nlh;
int err;
u32 *f;
unsigned lseq;
nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
if (nlh == NULL)
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 netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct xfrmu_spdhthresh *thresh4 = NULL;
struct xfrmu_spdhthresh *thresh6 = NULL;
if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
if (nla_len(rta) < sizeof(*thresh4)) {
NL_SET_ERR_MSG(extack, "Invalid SPD_IPV4_HTHRESH attribute length");
return -EINVAL;
}
thresh4 = nla_data(rta);
if (thresh4->lbits > 32 || thresh4->rbits > 32) {
NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 32 for IPv4)");
return -EINVAL;
}
}
if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
if (nla_len(rta) < sizeof(*thresh6)) {
NL_SET_ERR_MSG(extack, "Invalid SPD_IPV6_HTHRESH attribute length");
return -EINVAL;
}
thresh6 = nla_data(rta);
if (thresh6->lbits > 128 || thresh6->rbits > 128) {
NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 128 for IPv6)");
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 netlink_ext_ack *extack)
{
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(xfrm_net_nlsk(net, skb), 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);
}
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)
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 netlink_ext_ack *extack)
{
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(xfrm_net_nlsk(net, skb), r_skb, sportid);
}
static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr **attrs, struct netlink_ext_ack *extack)
{
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(xfrm_net_nlsk(net, skb), 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 netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct xfrm_state *x;
struct xfrm_userspi_info *p;
struct xfrm_translator *xtr;
struct sk_buff *resp_skb;
xfrm_address_t *daddr;
int family;
int err;
u32 mark;
struct xfrm_mark m;
u32 if_id = 0;
u32 pcpu_num = UINT_MAX;
p = nlmsg_data(nlh);
err = verify_spi_info(p->info.id.proto, p->min, p->max, extack);
if (err)
goto out_noput;
family = p->info.family;
daddr = &p->info.id.daddr;
x = NULL;
mark = xfrm_mark_get(attrs, &m);
if (attrs[XFRMA_IF_ID])
if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
if (attrs[XFRMA_SA_PCPU]) {
pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
if (pcpu_num >= num_possible_cpus()) {
err = -EINVAL;
NL_SET_ERR_MSG(extack, "pCPU number too big");
goto out_noput;
}
}
if (p->info.seq) {
x = xfrm_find_acq_byseq(net, mark, p->info.seq, pcpu_num);
if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
xfrm_state_put(x);
x = NULL;
}
}
if (!x)
x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
if_id, pcpu_num, p->info.id.proto, daddr,
&p->info.saddr, 1,
family);
err = -ENOENT;
if (!x) {
NL_SET_ERR_MSG(extack, "Target ACQUIRE not found");
goto out_noput;
}
err = xfrm_alloc_spi(x, p->min, p->max, extack);
if (err)
goto out;
if (attrs[XFRMA_SA_DIR])
x->dir = nla_get_u8(attrs[XFRMA_SA_DIR]);
resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
if (IS_ERR(resp_skb)) {
err = PTR_ERR(resp_skb);
goto out;
}
xtr = xfrm_get_translator();
if (xtr) {
err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
xfrm_put_translator(xtr);
if (err) {
kfree_skb(resp_skb);
goto out;
}
}
err = nlmsg_unicast(xfrm_net_nlsk(net, skb), resp_skb, NETLINK_CB(skb).portid);
out:
xfrm_state_put(x);
out_noput:
return err;
}
static int verify_policy_dir(u8 dir, struct netlink_ext_ack *extack)
{
switch (dir) {
case XFRM_POLICY_IN:
case XFRM_POLICY_OUT:
case XFRM_POLICY_FWD:
break;
default:
NL_SET_ERR_MSG(extack, "Invalid policy direction");
return -EINVAL;
}
return 0;
}
static int verify_policy_type(u8 type, struct netlink_ext_ack *extack)
{
switch (type) {
case XFRM_POLICY_TYPE_MAIN:
#ifdef CONFIG_XFRM_SUB_POLICY
case XFRM_POLICY_TYPE_SUB:
#endif
break;
default:
NL_SET_ERR_MSG(extack, "Invalid policy type");
return -EINVAL;
}
return 0;
}
static int verify_newpolicy_info(struct xfrm_userpolicy_info *p,
struct netlink_ext_ack *extack)
{
int ret;
switch (p->share) {
case XFRM_SHARE_ANY:
case XFRM_SHARE_SESSION:
case XFRM_SHARE_USER:
case XFRM_SHARE_UNIQUE:
break;
default:
NL_SET_ERR_MSG(extack, "Invalid policy share");
return -EINVAL;
}
switch (p->action) {
case XFRM_POLICY_ALLOW:
case XFRM_POLICY_BLOCK:
break;
default:
NL_SET_ERR_MSG(extack, "Invalid policy action");
return -EINVAL;
}
switch (p->sel.family) {
case AF_INET:
if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
return -EINVAL;
}
break;
case AF_INET6:
#if IS_ENABLED(CONFIG_IPV6)
if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
return -EINVAL;
}
break;
#else
NL_SET_ERR_MSG(extack, "IPv6 support disabled");
return -EAFNOSUPPORT;
#endif
default:
NL_SET_ERR_MSG(extack, "Invalid selector family");
return -EINVAL;
}
ret = verify_policy_dir(p->dir, extack);
if (ret)
return ret;
if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) {
NL_SET_ERR_MSG(extack, "Policy index doesn't match direction");
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;
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,
int dir, struct netlink_ext_ack *extack)
{
u16 prev_family;
int i;
if (nr > XFRM_MAX_DEPTH) {
NL_SET_ERR_MSG(extack, "Template count must be <= XFRM_MAX_DEPTH (" __stringify(XFRM_MAX_DEPTH) ")");
return -EINVAL;
}
prev_family = family;
for (i = 0; i < nr; i++) {
if (!ut[i].family)
ut[i].family = family;
switch (ut[i].mode) {
case XFRM_MODE_TUNNEL:
case XFRM_MODE_BEET:
if (ut[i].optional && dir == XFRM_POLICY_OUT) {
NL_SET_ERR_MSG(extack, "Mode in optional template not allowed in outbound policy");
return -EINVAL;
}
break;
case XFRM_MODE_IPTFS:
break;
default:
if (ut[i].family != prev_family) {
NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change");
return -EINVAL;
}
break;
}
if (ut[i].mode >= XFRM_MODE_MAX) {
NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")");
return -EINVAL;
}
prev_family = ut[i].family;
switch (ut[i].family) {
case AF_INET:
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
break;
#endif
default:
NL_SET_ERR_MSG(extack, "Invalid family in template");
return -EINVAL;
}
if (!xfrm_id_proto_valid(ut[i].id.proto)) {
NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template");
return -EINVAL;
}
}
return 0;
}
static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs,
int dir, struct netlink_ext_ack *extack)
{
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, dir, extack);
if (err)
return err;
copy_templates(pol, utmpl, nr);
}
return 0;
}
static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs,
struct netlink_ext_ack *extack)
{
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, extack);
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;
}
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;
}
static struct xfrm_policy *xfrm_policy_construct(struct net *net,
struct xfrm_userpolicy_info *p,
struct nlattr **attrs,
int *errp,
struct netlink_ext_ack *extack)
{
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, extack);
if (err)
goto error;
if (!(err = copy_from_user_tmpl(xp, attrs, p->dir, extack)))
err = copy_from_user_sec_ctx(xp, attrs);
if (err)
goto error;
xfrm_mark_get(attrs, &xp->mark);
if (attrs[XFRMA_IF_ID])
xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
if (attrs[XFRMA_OFFLOAD_DEV]) {
err = xfrm_dev_policy_add(net, xp,
nla_data(attrs[XFRMA_OFFLOAD_DEV]),
p->dir, extack);
if (err)
goto error;
}
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 netlink_ext_ack *extack)
{
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, extack);
if (err)
return err;
err = verify_sec_ctx_len(attrs, extack);
if (err)
return err;
xp = xfrm_policy_construct(net, p, attrs, &err, extack);
if (!xp)
return err;
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) {
xfrm_dev_policy_delete(xp);
xfrm_dev_policy_free(xp);
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;
if (xp->xfrm_nr > XFRM_MAX_DEPTH)
return -ENOBUFS;
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;
memset(&upt, 0, sizeof(upt));
upt.type = type;
return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
}
#else
static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
{
return 0;
}
#endif
static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
{
struct xfrm_dump_info *sp = ptr;
struct xfrm_userpolicy_info *p;
struct sk_buff *in_skb = sp->in_skb;
struct sk_buff *skb = sp->out_skb;
struct xfrm_translator *xtr;
struct nlmsghdr *nlh;
int err;
nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
if (nlh == NULL)
return -EMSGSIZE;
p = nlmsg_data(nlh);
copy_to_user_policy(xp, p, dir);
err = copy_to_user_tmpl(xp, skb);
if (!err)
err = copy_to_user_sec_ctx(xp, skb);
if (!err)
err = copy_to_user_policy_type(xp->type, skb);
if (!err)
err = xfrm_mark_put(skb, &xp->mark);
if (!err)
err = xfrm_if_id_put(skb, xp->if_id);
if (!err && xp->xdo.dev)
err = copy_user_offload(&xp->xdo, skb);
if (err) {
nlmsg_cancel(skb, nlh);
return err;
}
nlmsg_end(skb, nlh);
xtr = xfrm_get_translator();
if (xtr) {
err = xtr->alloc_compat(skb, nlh);
xfrm_put_translator(xtr);
if (err) {
nlmsg_cancel(skb, nlh);
return err;
}
}
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_notify_userpolicy(struct net *net)
{
struct xfrm_userpolicy_default *up;
int len = NLMSG_ALIGN(sizeof(*up));
struct nlmsghdr *nlh;
struct sk_buff *skb;
int err;
skb = nlmsg_new(len, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0);
if (nlh == NULL) {
kfree_skb(skb);
return -EMSGSIZE;
}
up = nlmsg_data(nlh);
up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
nlmsg_end(skb, nlh);
rcu_read_lock();
err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
rcu_read_unlock();
return err;
}
static bool xfrm_userpolicy_is_valid(__u8 policy)
{
return policy == XFRM_USERPOLICY_BLOCK ||
policy == XFRM_USERPOLICY_ACCEPT;
}
static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr **attrs, struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct xfrm_userpolicy_default *up = nlmsg_data(nlh);
if (xfrm_userpolicy_is_valid(up->in))
net->xfrm.policy_default[XFRM_POLICY_IN] = up->in;
if (xfrm_userpolicy_is_valid(up->fwd))
net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd;
if (xfrm_userpolicy_is_valid(up->out))
net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out;
rt_genid_bump_all(net);
xfrm_notify_userpolicy(net);
return 0;
}
static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr **attrs, struct netlink_ext_ack *extack)
{
struct sk_buff *r_skb;
struct nlmsghdr *r_nlh;
struct net *net = sock_net(skb->sk);
struct xfrm_userpolicy_default *r_up;
int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));
u32 portid = NETLINK_CB(skb).portid;
u32 seq = nlh->nlmsg_seq;
r_skb = nlmsg_new(len, GFP_ATOMIC);
if (!r_skb)
return -ENOMEM;
r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0);
if (!r_nlh) {
kfree_skb(r_skb);
return -EMSGSIZE;
}
r_up = nlmsg_data(r_nlh);
r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
nlmsg_end(r_skb, r_nlh);
return nlmsg_unicast(xfrm_net_nlsk(net, skb), r_skb, portid);
}
static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr **attrs,
struct netlink_ext_ack *extack)
{
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 if_id = 0;
p = nlmsg_data(nlh);
delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
err = copy_from_user_policy_type(&type, attrs, extack);
if (err)
return err;
err = verify_policy_dir(p->dir, extack);
if (err)
return err;
if (attrs[XFRMA_IF_ID])
if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
xfrm_mark_get(attrs, &m);
if (p->index)
xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
p->index, delete, &err);
else {
struct nlattr *rt = attrs[XFRMA_SEC_CTX];
struct xfrm_sec_ctx *ctx;
err = verify_sec_ctx_len(attrs, extack);
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, &m, if_id, type, p->dir,
&p->sel, ctx, delete, &err);
security_xfrm_policy_free(ctx);
}
if (xp == NULL)
return -ENOENT;
if (!delete) {
struct sk_buff *resp_skb;
resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
if (IS_ERR(resp_skb)) {
err = PTR_ERR(resp_skb);
} else {
err = nlmsg_unicast(xfrm_net_nlsk(net, skb), 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 netlink_ext_ack *extack)
{
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)
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)
+ nla_total_size(4)
+ nla_total_size(sizeof(x->dir))
+ nla_total_size(4);
}
static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
{
struct xfrm_aevent_id *id;
struct nlmsghdr *nlh;
int err;
nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
if (nlh == NULL)
return -EMSGSIZE;
id = nlmsg_data(nlh);
memset(&id->sa_id, 0, sizeof(id->sa_id));
memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
id->sa_id.spi = x->id.spi;
id->sa_id.family = x->props.family;
id->sa_id.proto = x->id.proto;
memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
id->reqid = x->props.reqid;
id->flags = c->data.aevent;
if (x->replay_esn) {
err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
xfrm_replay_state_esn_len(x->replay_esn),
x->replay_esn);
} else {
err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
&x->replay);
}
if (err)
goto out_cancel;
err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
XFRMA_PAD);
if (err)
goto out_cancel;
if (id->flags & XFRM_AE_RTHR) {
err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
if (err)
goto out_cancel;
}
if (id->flags & XFRM_AE_ETHR) {
err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
x->replay_maxage * 10 / HZ);
if (err)
goto out_cancel;
}
err = xfrm_mark_put(skb, &x->mark);
if (err)
goto out_cancel;
err = xfrm_if_id_put(skb, x->if_id);
if (err)
goto out_cancel;
if (x->pcpu_num != UINT_MAX) {
err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
if (err)
goto out_cancel;
}
if (x->dir) {
err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
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 netlink_ext_ack *extack)
{
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;
}
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(xfrm_net_nlsk(net, skb), 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 netlink_ext_ack *extack)
{
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) {
NL_SET_ERR_MSG(extack, "Missing required attribute for AE");
return err;
}
if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) {
NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required");
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) {
NL_SET_ERR_MSG(extack, "SA must be in VALID state");
goto out;
}
err = xfrm_replay_verify_len(x->replay_esn, re, extack);
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 netlink_ext_ack *extack)
{
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, extack);
if (err)
return err;
err = xfrm_policy_flush(net, type, true);
if (err) {
if (err == -ESRCH)
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 netlink_ext_ack *extack)
{
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 if_id = 0;
err = copy_from_user_policy_type(&type, attrs, extack);
if (err)
return err;
err = verify_policy_dir(p->dir, extack);
if (err)
return err;
if (attrs[XFRMA_IF_ID])
if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
xfrm_mark_get(attrs, &m);
if (p->index)
xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
0, &err);
else {
struct nlattr *rt = attrs[XFRMA_SEC_CTX];
struct xfrm_sec_ctx *ctx;
err = verify_sec_ctx_len(attrs, extack);
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, &m, if_id, type, p->dir,
&p->sel, ctx, 0, &err);
security_xfrm_policy_free(ctx);
}
if (xp == NULL)
return -ENOENT;
if (unlikely(xp->walk.dead))
goto out;
err = 0;
if (up->hard) {
xfrm_policy_delete(xp, p->dir);
xfrm_audit_policy_delete(xp, 1, true);
}
km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
out:
xfrm_pol_put(xp);
return err;
}
static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr **attrs,
struct netlink_ext_ack *extack)
{
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) {
NL_SET_ERR_MSG(extack, "SA must be in VALID state");
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 netlink_ext_ack *extack)
{
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);
if (attrs[XFRMA_SA_PCPU]) {
x->pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
err = -EINVAL;
if (x->pcpu_num >= num_possible_cpus()) {
NL_SET_ERR_MSG(extack, "pCPU number too big");
goto free_state;
}
}
err = verify_newpolicy_info(&ua->policy, extack);
if (err)
goto free_state;
err = verify_sec_ctx_len(attrs, extack);
if (err)
goto free_state;
xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack);
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);
for (i = 0; i < xp->xfrm_nr; i++, ut++) {
struct xfrm_tmpl *t = &xp->xfrm_vec[i];
memcpy(&x->id, &t->id, sizeof(x->id));
x->props.mode = t->mode;
x->props.reqid = t->reqid;
x->props.family = ut->family;
t->aalgos = ua->aalgos;
t->ealgos = ua->ealgos;
t->calgos = ua->calgos;
err = km_query(x, t, xp);
}
xfrm_state_free(x);
xfrm_dev_policy_delete(xp);
xfrm_dev_policy_free(xp);
security_xfrm_policy_free(xp->security);
kfree(xp);
return 0;
free_state:
xfrm_state_free(x);
nomem:
return err;
}
#ifdef CONFIG_XFRM_MIGRATE
static int copy_from_user_migrate(struct xfrm_migrate *ma,
struct xfrm_kmaddress *k,
struct nlattr **attrs, int *num,
struct netlink_ext_ack *extack)
{
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) {
NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)");
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 netlink_ext_ack *extack)
{
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;
struct xfrm_user_offload *xuo = NULL;
u32 if_id = 0;
if (!attrs[XFRMA_MIGRATE]) {
NL_SET_ERR_MSG(extack, "Missing required MIGRATE attribute");
return -EINVAL;
}
kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
err = copy_from_user_policy_type(&type, attrs, extack);
if (err)
return err;
err = copy_from_user_migrate(m, kmp, attrs, &n, extack);
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 -ENOMEM;
}
if (attrs[XFRMA_IF_ID])
if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
if (attrs[XFRMA_OFFLOAD_DEV]) {
xuo = kmemdup(nla_data(attrs[XFRMA_OFFLOAD_DEV]),
sizeof(*xuo), GFP_KERNEL);
if (!xuo) {
err = -ENOMEM;
goto error;
}
}
err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap,
if_id, extack, xuo);
error:
kfree(encap);
kfree(xuo);
return err;
}
#else
static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr **attrs, struct netlink_ext_ack *extack)
{
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);
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;
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)
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),
[XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
[XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
};
EXPORT_SYMBOL_GPL(xfrm_msg_min);
#undef XMSGSIZE
const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
[XFRMA_UNSPEC] = { .strict_start_type = XFRMA_SA_DIR },
[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_user_sec_ctx) },
[XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
[XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
[XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
[XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
[XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
[XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
[XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
[XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
[XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
[XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
[XFRMA_TFCPAD] = { .type = NLA_U32 },
[XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
[XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
[XFRMA_PROTO] = { .type = NLA_U8 },
[XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
[XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
[XFRMA_SET_MARK] = { .type = NLA_U32 },
[XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
[XFRMA_IF_ID] = { .type = NLA_U32 },
[XFRMA_MTIMER_THRESH] = { .type = NLA_U32 },
[XFRMA_SA_DIR] = NLA_POLICY_RANGE(NLA_U8, XFRM_SA_DIR_IN, XFRM_SA_DIR_OUT),
[XFRMA_NAT_KEEPALIVE_INTERVAL] = { .type = NLA_U32 },
[XFRMA_SA_PCPU] = { .type = NLA_U32 },
[XFRMA_IPTFS_DROP_TIME] = { .type = NLA_U32 },
[XFRMA_IPTFS_REORDER_WINDOW] = { .type = NLA_U16 },
[XFRMA_IPTFS_DONT_FRAG] = { .type = NLA_FLAG },
[XFRMA_IPTFS_INIT_DELAY] = { .type = NLA_U32 },
[XFRMA_IPTFS_MAX_QSIZE] = { .type = NLA_U32 },
[XFRMA_IPTFS_PKT_SIZE] = { .type = NLA_U32 },
};
EXPORT_SYMBOL_GPL(xfrma_policy);
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 **,
struct netlink_ext_ack *);
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 },
[XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default },
[XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default },
};
static int xfrm_reject_unused_attr(int type, struct nlattr **attrs,
struct netlink_ext_ack *extack)
{
if (attrs[XFRMA_SA_DIR]) {
switch (type) {
case XFRM_MSG_NEWSA:
case XFRM_MSG_UPDSA:
case XFRM_MSG_ALLOCSPI:
break;
default:
NL_SET_ERR_MSG(extack, "Invalid attribute SA_DIR");
return -EINVAL;
}
}
if (attrs[XFRMA_SA_PCPU]) {
switch (type) {
case XFRM_MSG_NEWSA:
case XFRM_MSG_UPDSA:
case XFRM_MSG_ALLOCSPI:
case XFRM_MSG_ACQUIRE:
break;
default:
NL_SET_ERR_MSG(extack, "Invalid attribute SA_PCPU");
return -EINVAL;
}
}
return 0;
}
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;
struct nlmsghdr *nlh64 = NULL;
int type, err;
type = nlh->nlmsg_type;
if (type > XFRM_MSG_MAX)
return -EINVAL;
type -= XFRM_MSG_BASE;
link = &xfrm_dispatch[type];
if (!netlink_net_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (in_compat_syscall()) {
struct xfrm_translator *xtr = xfrm_get_translator();
if (!xtr)
return -EOPNOTSUPP;
nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
link->nla_pol, extack);
xfrm_put_translator(xtr);
if (IS_ERR(nlh64))
return PTR_ERR(nlh64);
if (nlh64)
nlh = nlh64;
}
if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
(nlh->nlmsg_flags & NLM_F_DUMP)) {
struct netlink_dump_control c = {
.start = link->start,
.dump = link->dump,
.done = link->done,
};
if (link->dump == NULL) {
err = -EINVAL;
goto err;
}
err = netlink_dump_start(xfrm_net_nlsk(net, skb), skb, nlh, &c);
goto err;
}
err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
link->nla_max ? : XFRMA_MAX,
link->nla_pol ? : xfrma_policy, extack);
if (err < 0)
goto err;
if (!link->nla_pol || link->nla_pol == xfrma_policy) {
err = xfrm_reject_unused_attr((type + XFRM_MSG_BASE), attrs, extack);
if (err < 0)
goto err;
}
if (link->doit == NULL) {
err = -EINVAL;
goto err;
}
err = link->doit(skb, nlh, attrs, extack);
if (skb_has_frag_list(skb)) {
kfree_skb(skb_shinfo(skb)->frag_list);
skb_shinfo(skb)->frag_list = NULL;
}
err:
kvfree(nlh64);
return err;
}
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)) +
nla_total_size(sizeof_field(struct xfrm_state, dir)) +
nla_total_size(4);
}
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;
memset_after(ue, 0, hard);
err = xfrm_mark_put(skb, &x->mark);
if (err)
return err;
err = xfrm_if_id_put(skb, x->if_id);
if (err)
return err;
if (x->pcpu_num != UINT_MAX) {
err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
if (err)
return err;
}
if (x->dir) {
err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
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(struct xfrm_user_offload));
if (x->props.smark.v | x->props.smark.m) {
l += nla_total_size(sizeof(x->props.smark.v));
l += nla_total_size(sizeof(x->props.smark.m));
}
if (x->if_id)
l += nla_total_size(sizeof(x->if_id));
if (x->pcpu_num != UINT_MAX)
l += nla_total_size(sizeof(x->pcpu_num));
l += nla_total_size_64bit(sizeof(u64));
if (x->mapping_maxage)
l += nla_total_size(sizeof(x->mapping_maxage));
if (x->dir)
l += nla_total_size(sizeof(x->dir));
if (x->nat_keepalive_interval)
l += nla_total_size(sizeof(x->nat_keepalive_interval));
if (x->mode_cbs && x->mode_cbs->sa_len)
l += x->mode_cbs->sa_len(x);
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))
+ nla_total_size(4)
+ 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)
err = xfrm_if_id_put(skb, xp->if_id);
if (!err && xp->xdo.dev)
err = copy_user_offload(&xp->xdo, skb);
if (!err && x->pcpu_num != UINT_MAX)
err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
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);
}
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, NULL))
return NULL;
nr = ((len - sizeof(*p)) / sizeof(*ut));
if (validate_tmpl(nr, ut, p->sel.family, p->dir, NULL))
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)
err = xfrm_if_id_put(skb, xp->if_id);
if (!err && xp->xdo.dev)
err = copy_user_offload(&xp->xdo, skb);
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)
err = xfrm_if_id_put(skb, xp->if_id);
if (!err && xp->xdo.dev)
err = copy_user_offload(&xp->xdo, 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_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;
rcu_assign_pointer(net->xfrm.nlsk, nlsk);
return 0;
}
static void __net_exit xfrm_user_net_pre_exit(struct net *net)
{
RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
}
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)
netlink_kernel_release(net->xfrm.nlsk_stash);
}
static struct pernet_operations xfrm_user_net_ops = {
.init = xfrm_user_net_init,
.pre_exit = xfrm_user_net_pre_exit,
.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;
xfrm_register_km(&netlink_mgr);
return 0;
}
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_DESCRIPTION("XFRM User interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
