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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next

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Steffen Klassert says:

====================
pull request (net-next): ipsec-next 2020-10-02

1) Add a full xfrm compatible layer for 32-bit applications on
   64-bit kernels. From Dmitry Safonov.

Please pull or let me know if there are problems.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2020-10-02 13:16:15 -07:00
commit c16bcd70a1
11 changed files with 3066 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
MAINTAINERS
View File

@ -12158,6 +12158,7 @@ F: net/ipv6/ipcomp6.c
F: net/ipv6/xfrm*
F: net/key/
F: net/xfrm/
F: tools/testing/selftests/net/ipsec.c
NETWORKING [IPv4/IPv6]
M: "David S. Miller" <davem@davemloft.net>

33
include/net/xfrm.h
View File

@ -2000,6 +2000,39 @@ static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
return 0;
}
extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
extern const struct nla_policy xfrma_policy[XFRMA_MAX+1];
struct xfrm_translator {
/* Allocate frag_list and put compat translation there */
int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
/* Allocate nlmsg with 64-bit translaton of received 32-bit message */
struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh,
int maxtype, const struct nla_policy *policy,
struct netlink_ext_ack *extack);
/* Translate 32-bit user_policy from sockptr */
int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);
struct module *owner;
};
#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
extern int xfrm_register_translator(struct xfrm_translator *xtr);
extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
extern struct xfrm_translator *xfrm_get_translator(void);
extern void xfrm_put_translator(struct xfrm_translator *xtr);
#else
static inline struct xfrm_translator *xfrm_get_translator(void)
{
return NULL;
}
static inline void xfrm_put_translator(struct xfrm_translator *xtr)
{
}
#endif
#if IS_ENABLED(CONFIG_IPV6)
static inline bool xfrm6_local_dontfrag(const struct sock *sk)
{

47
net/netlink/af_netlink.c
View File

@ -2186,13 +2186,35 @@ EXPORT_SYMBOL(__nlmsg_put);
* It would be better to create kernel thread.
*/
static int netlink_dump_done(struct netlink_sock *nlk, struct sk_buff *skb,
struct netlink_callback *cb,
struct netlink_ext_ack *extack)
{
struct nlmsghdr *nlh;
nlh = nlmsg_put_answer(skb, cb, NLMSG_DONE, sizeof(nlk->dump_done_errno),
NLM_F_MULTI | cb->answer_flags);
if (WARN_ON(!nlh))
return -ENOBUFS;
nl_dump_check_consistent(cb, nlh);
memcpy(nlmsg_data(nlh), &nlk->dump_done_errno, sizeof(nlk->dump_done_errno));
if (extack->_msg && nlk->flags & NETLINK_F_EXT_ACK) {
nlh->nlmsg_flags |= NLM_F_ACK_TLVS;
if (!nla_put_string(skb, NLMSGERR_ATTR_MSG, extack->_msg))
nlmsg_end(skb, nlh);
}
return 0;
}
static int netlink_dump(struct sock *sk)
{
struct netlink_sock *nlk = nlk_sk(sk);
struct netlink_ext_ack extack = {};
struct netlink_callback *cb;
struct sk_buff *skb = NULL;
struct nlmsghdr *nlh;
struct module *module;
int err = -ENOBUFS;
int alloc_min_size;
@ -2258,22 +2280,19 @@ static int netlink_dump(struct sock *sk)
return 0;
}
nlh = nlmsg_put_answer(skb, cb, NLMSG_DONE,
sizeof(nlk->dump_done_errno),
NLM_F_MULTI | cb->answer_flags);
if (WARN_ON(!nlh))
if (netlink_dump_done(nlk, skb, cb, &extack))
goto errout_skb;
nl_dump_check_consistent(cb, nlh);
memcpy(nlmsg_data(nlh), &nlk->dump_done_errno,
sizeof(nlk->dump_done_errno));
if (extack._msg && nlk->flags & NETLINK_F_EXT_ACK) {
nlh->nlmsg_flags |= NLM_F_ACK_TLVS;
if (!nla_put_string(skb, NLMSGERR_ATTR_MSG, extack._msg))
nlmsg_end(skb, nlh);
#ifdef CONFIG_COMPAT_NETLINK_MESSAGES
/* frag_list skb's data is used for compat tasks
* and the regular skb's data for normal (non-compat) tasks.
* See netlink_recvmsg().
*/
if (unlikely(skb_shinfo(skb)->frag_list)) {
if (netlink_dump_done(nlk, skb_shinfo(skb)->frag_list, cb, &extack))
goto errout_skb;
}
#endif
if (sk_filter(sk, skb))
kfree_skb(skb);

11
net/xfrm/Kconfig
View File

@ -28,6 +28,17 @@ config XFRM_USER
If unsure, say Y.
config XFRM_USER_COMPAT
tristate "Compatible ABI support"
depends on XFRM_USER && COMPAT_FOR_U64_ALIGNMENT && \
HAVE_EFFICIENT_UNALIGNED_ACCESS
select WANT_COMPAT_NETLINK_MESSAGES
help
Transformation(XFRM) user configuration interface like IPsec
used by compatible Linux applications.
If unsure, say N.
config XFRM_INTERFACE
tristate "Transformation virtual interface"
depends on XFRM && IPV6

1
net/xfrm/Makefile
View File

@ -9,6 +9,7 @@ obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_hash.o \
obj-$(CONFIG_XFRM_STATISTICS) += xfrm_proc.o
obj-$(CONFIG_XFRM_ALGO) += xfrm_algo.o
obj-$(CONFIG_XFRM_USER) += xfrm_user.o
obj-$(CONFIG_XFRM_USER_COMPAT) += xfrm_compat.o
obj-$(CONFIG_XFRM_IPCOMP) += xfrm_ipcomp.o
obj-$(CONFIG_XFRM_INTERFACE) += xfrm_interface.o
obj-$(CONFIG_XFRM_ESPINTCP) += espintcp.o

625
net/xfrm/xfrm_compat.c Normal file
View File

@ -0,0 +1,625 @@
// SPDX-License-Identifier: GPL-2.0
/*
* XFRM compat layer
* Author: Dmitry Safonov <dima@arista.com>
* Based on code and translator idea by: Florian Westphal <fw@strlen.de>
*/
#include <linux/compat.h>
#include <linux/xfrm.h>
#include <net/xfrm.h>
struct compat_xfrm_lifetime_cfg {
compat_u64 soft_byte_limit, hard_byte_limit;
compat_u64 soft_packet_limit, hard_packet_limit;
compat_u64 soft_add_expires_seconds, hard_add_expires_seconds;
compat_u64 soft_use_expires_seconds, hard_use_expires_seconds;
}; /* same size on 32bit, but only 4 byte alignment required */
struct compat_xfrm_lifetime_cur {
compat_u64 bytes, packets, add_time, use_time;
}; /* same size on 32bit, but only 4 byte alignment required */
struct compat_xfrm_userpolicy_info {
struct xfrm_selector sel;
struct compat_xfrm_lifetime_cfg lft;
struct compat_xfrm_lifetime_cur curlft;
__u32 priority, index;
u8 dir, action, flags, share;
/* 4 bytes additional padding on 64bit */
};
struct compat_xfrm_usersa_info {
struct xfrm_selector sel;
struct xfrm_id id;
xfrm_address_t saddr;
struct compat_xfrm_lifetime_cfg lft;
struct compat_xfrm_lifetime_cur curlft;
struct xfrm_stats stats;
__u32 seq, reqid;
u16 family;
u8 mode, replay_window, flags;
/* 4 bytes additional padding on 64bit */
};
struct compat_xfrm_user_acquire {
struct xfrm_id id;
xfrm_address_t saddr;
struct xfrm_selector sel;
struct compat_xfrm_userpolicy_info policy;
/* 4 bytes additional padding on 64bit */
__u32 aalgos, ealgos, calgos, seq;
};
struct compat_xfrm_userspi_info {
struct compat_xfrm_usersa_info info;
/* 4 bytes additional padding on 64bit */
__u32 min, max;
};
struct compat_xfrm_user_expire {
struct compat_xfrm_usersa_info state;
/* 8 bytes additional padding on 64bit */
u8 hard;
};
struct compat_xfrm_user_polexpire {
struct compat_xfrm_userpolicy_info pol;
/* 8 bytes additional padding on 64bit */
u8 hard;
};
#define XMSGSIZE(type) sizeof(struct type)
static const int compat_msg_min[XFRM_NR_MSGTYPES] = {
[XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(compat_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(compat_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(compat_xfrm_userspi_info),
[XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_acquire),
[XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_expire),
[XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userpolicy_info),
[XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_usersa_info),
[XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_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_NEWSADINFO - XFRM_MSG_BASE] = sizeof(u32),
[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_MAPPING - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_mapping)
};
static const struct nla_policy compat_policy[XFRMA_MAX+1] = {
[XFRMA_SA] = { .len = XMSGSIZE(compat_xfrm_usersa_info)},
[XFRMA_POLICY] = { .len = XMSGSIZE(compat_xfrm_userpolicy_info)},
[XFRMA_LASTUSED] = { .type = NLA_U64},
[XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
[XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
[XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
[XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
[XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
[XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
[XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
[XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
[XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
[XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
[XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
[XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
[XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
[XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
[XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
[XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
[XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
[XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
[XFRMA_TFCPAD] = { .type = NLA_U32 },
[XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
[XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
[XFRMA_PROTO] = { .type = NLA_U8 },
[XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
[XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
[XFRMA_SET_MARK] = { .type = NLA_U32 },
[XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
[XFRMA_IF_ID] = { .type = NLA_U32 },
};
static struct nlmsghdr *xfrm_nlmsg_put_compat(struct sk_buff *skb,
const struct nlmsghdr *nlh_src, u16 type)
{
int payload = compat_msg_min[type];
int src_len = xfrm_msg_min[type];
struct nlmsghdr *nlh_dst;
/* Compat messages are shorter or equal to native (+padding) */
if (WARN_ON_ONCE(src_len < payload))
return ERR_PTR(-EMSGSIZE);
nlh_dst = nlmsg_put(skb, nlh_src->nlmsg_pid, nlh_src->nlmsg_seq,
nlh_src->nlmsg_type, payload, nlh_src->nlmsg_flags);
if (!nlh_dst)
return ERR_PTR(-EMSGSIZE);
memset(nlmsg_data(nlh_dst), 0, payload);
switch (nlh_src->nlmsg_type) {
/* Compat message has the same layout as native */
case XFRM_MSG_DELSA:
case XFRM_MSG_DELPOLICY:
case XFRM_MSG_FLUSHSA:
case XFRM_MSG_FLUSHPOLICY:
case XFRM_MSG_NEWAE:
case XFRM_MSG_REPORT:
case XFRM_MSG_MIGRATE:
case XFRM_MSG_NEWSADINFO:
case XFRM_MSG_NEWSPDINFO:
case XFRM_MSG_MAPPING:
WARN_ON_ONCE(src_len != payload);
memcpy(nlmsg_data(nlh_dst), nlmsg_data(nlh_src), src_len);
break;
/* 4 byte alignment for trailing u64 on native, but not on compat */
case XFRM_MSG_NEWSA:
case XFRM_MSG_NEWPOLICY:
case XFRM_MSG_UPDSA:
case XFRM_MSG_UPDPOLICY:
WARN_ON_ONCE(src_len != payload + 4);
memcpy(nlmsg_data(nlh_dst), nlmsg_data(nlh_src), payload);
break;
case XFRM_MSG_EXPIRE: {
const struct xfrm_user_expire *src_ue = nlmsg_data(nlh_src);
struct compat_xfrm_user_expire *dst_ue = nlmsg_data(nlh_dst);
/* compat_xfrm_user_expire has 4-byte smaller state */
memcpy(dst_ue, src_ue, sizeof(dst_ue->state));
dst_ue->hard = src_ue->hard;
break;
}
case XFRM_MSG_ACQUIRE: {
const struct xfrm_user_acquire *src_ua = nlmsg_data(nlh_src);
struct compat_xfrm_user_acquire *dst_ua = nlmsg_data(nlh_dst);
memcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos));
dst_ua->aalgos = src_ua->aalgos;
dst_ua->ealgos = src_ua->ealgos;
dst_ua->calgos = src_ua->calgos;
dst_ua->seq = src_ua->seq;
break;
}
case XFRM_MSG_POLEXPIRE: {
const struct xfrm_user_polexpire *src_upe = nlmsg_data(nlh_src);
struct compat_xfrm_user_polexpire *dst_upe = nlmsg_data(nlh_dst);
/* compat_xfrm_user_polexpire has 4-byte smaller state */
memcpy(dst_upe, src_upe, sizeof(dst_upe->pol));
dst_upe->hard = src_upe->hard;
break;
}
case XFRM_MSG_ALLOCSPI: {
const struct xfrm_userspi_info *src_usi = nlmsg_data(nlh_src);
struct compat_xfrm_userspi_info *dst_usi = nlmsg_data(nlh_dst);
/* compat_xfrm_user_polexpire has 4-byte smaller state */
memcpy(dst_usi, src_usi, sizeof(src_usi->info));
dst_usi->min = src_usi->min;
dst_usi->max = src_usi->max;
break;
}
/* Not being sent by kernel */
case XFRM_MSG_GETSA:
case XFRM_MSG_GETPOLICY:
case XFRM_MSG_GETAE:
case XFRM_MSG_GETSADINFO:
case XFRM_MSG_GETSPDINFO:
default:
WARN_ONCE(1, "unsupported nlmsg_type %d", nlh_src->nlmsg_type);
return ERR_PTR(-EOPNOTSUPP);
}
return nlh_dst;
}
static int xfrm_nla_cpy(struct sk_buff *dst, const struct nlattr *src, int len)
{
return nla_put(dst, src->nla_type, len, nla_data(src));
}
static int xfrm_xlate64_attr(struct sk_buff *dst, const struct nlattr *src)
{
switch (src->nla_type) {
case XFRMA_PAD:
/* Ignore */
return 0;
case XFRMA_ALG_AUTH:
case XFRMA_ALG_CRYPT:
case XFRMA_ALG_COMP:
case XFRMA_ENCAP:
case XFRMA_TMPL:
return xfrm_nla_cpy(dst, src, nla_len(src));
case XFRMA_SA:
return xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_usersa_info));
case XFRMA_POLICY:
return xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_userpolicy_info));
case XFRMA_SEC_CTX:
return xfrm_nla_cpy(dst, src, nla_len(src));
case XFRMA_LTIME_VAL:
return nla_put_64bit(dst, src->nla_type, nla_len(src),
nla_data(src), XFRMA_PAD);
case XFRMA_REPLAY_VAL:
case XFRMA_REPLAY_THRESH:
case XFRMA_ETIMER_THRESH:
case XFRMA_SRCADDR:
case XFRMA_COADDR:
return xfrm_nla_cpy(dst, src, nla_len(src));
case XFRMA_LASTUSED:
return nla_put_64bit(dst, src->nla_type, nla_len(src),
nla_data(src), XFRMA_PAD);
case XFRMA_POLICY_TYPE:
case XFRMA_MIGRATE:
case XFRMA_ALG_AEAD:
case XFRMA_KMADDRESS:
case XFRMA_ALG_AUTH_TRUNC:
case XFRMA_MARK:
case XFRMA_TFCPAD:
case XFRMA_REPLAY_ESN_VAL:
case XFRMA_SA_EXTRA_FLAGS:
case XFRMA_PROTO:
case XFRMA_ADDRESS_FILTER:
case XFRMA_OFFLOAD_DEV:
case XFRMA_SET_MARK:
case XFRMA_SET_MARK_MASK:
case XFRMA_IF_ID:
return xfrm_nla_cpy(dst, src, nla_len(src));
default:
BUILD_BUG_ON(XFRMA_MAX != XFRMA_IF_ID);
WARN_ONCE(1, "unsupported nla_type %d", src->nla_type);
return -EOPNOTSUPP;
}
}
/* Take kernel-built (64bit layout) and create 32bit layout for userspace */
static int xfrm_xlate64(struct sk_buff *dst, const struct nlmsghdr *nlh_src)
{
u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE;
const struct nlattr *nla, *attrs;
struct nlmsghdr *nlh_dst;
int len, remaining;
nlh_dst = xfrm_nlmsg_put_compat(dst, nlh_src, type);
if (IS_ERR(nlh_dst))
return PTR_ERR(nlh_dst);
attrs = nlmsg_attrdata(nlh_src, xfrm_msg_min[type]);
len = nlmsg_attrlen(nlh_src, xfrm_msg_min[type]);
nla_for_each_attr(nla, attrs, len, remaining) {
int err = xfrm_xlate64_attr(dst, nla);
if (err)
return err;
}
nlmsg_end(dst, nlh_dst);
return 0;
}
static int xfrm_alloc_compat(struct sk_buff *skb, const struct nlmsghdr *nlh_src)
{
u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE;
struct sk_buff *new = NULL;
int err;
if (WARN_ON_ONCE(type >= ARRAY_SIZE(xfrm_msg_min)))
return -EOPNOTSUPP;
if (skb_shinfo(skb)->frag_list == NULL) {
new = alloc_skb(skb->len + skb_tailroom(skb), GFP_ATOMIC);
if (!new)
return -ENOMEM;
skb_shinfo(skb)->frag_list = new;
}
err = xfrm_xlate64(skb_shinfo(skb)->frag_list, nlh_src);
if (err) {
if (new) {
kfree_skb(new);
skb_shinfo(skb)->frag_list = NULL;
}
return err;
}
return 0;
}
/* Calculates len of translated 64-bit message. */
static size_t xfrm_user_rcv_calculate_len64(const struct nlmsghdr *src,
struct nlattr *attrs[XFRMA_MAX+1])
{
size_t len = nlmsg_len(src);
switch (src->nlmsg_type) {
case XFRM_MSG_NEWSA:
case XFRM_MSG_NEWPOLICY:
case XFRM_MSG_ALLOCSPI:
case XFRM_MSG_ACQUIRE:
case XFRM_MSG_UPDPOLICY:
case XFRM_MSG_UPDSA:
len += 4;
break;
case XFRM_MSG_EXPIRE:
case XFRM_MSG_POLEXPIRE:
len += 8;
break;
default:
break;
}
if (attrs[XFRMA_SA])
len += 4;
if (attrs[XFRMA_POLICY])
len += 4;
/* XXX: some attrs may need to be realigned
* if !CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
*/
return len;
}
static int xfrm_attr_cpy32(void *dst, size_t *pos, const struct nlattr *src,
size_t size, int copy_len, int payload)
{
struct nlmsghdr *nlmsg = dst;
struct nlattr *nla;
if (WARN_ON_ONCE(copy_len > payload))
copy_len = payload;
if (size - *pos < nla_attr_size(payload))
return -ENOBUFS;
nla = dst + *pos;
memcpy(nla, src, nla_attr_size(copy_len));
nla->nla_len = nla_attr_size(payload);
*pos += nla_attr_size(payload);
nlmsg->nlmsg_len += nla->nla_len;
memset(dst + *pos, 0, payload - copy_len);
*pos += payload - copy_len;
return 0;
}
static int xfrm_xlate32_attr(void *dst, const struct nlattr *nla,
size_t *pos, size_t size,
struct netlink_ext_ack *extack)
{
int type = nla_type(nla);
u16 pol_len32, pol_len64;
int err;
if (type > XFRMA_MAX) {
BUILD_BUG_ON(XFRMA_MAX != XFRMA_IF_ID);
NL_SET_ERR_MSG(extack, "Bad attribute");
return -EOPNOTSUPP;
}
if (nla_len(nla) < compat_policy[type].len) {
NL_SET_ERR_MSG(extack, "Attribute bad length");
return -EOPNOTSUPP;
}
pol_len32 = compat_policy[type].len;
pol_len64 = xfrma_policy[type].len;
/* XFRMA_SA and XFRMA_POLICY - need to know how-to translate */
if (pol_len32 != pol_len64) {
if (nla_len(nla) != compat_policy[type].len) {
NL_SET_ERR_MSG(extack, "Attribute bad length");
return -EOPNOTSUPP;
}
err = xfrm_attr_cpy32(dst, pos, nla, size, pol_len32, pol_len64);
if (err)
return err;
}
return xfrm_attr_cpy32(dst, pos, nla, size, nla_len(nla), nla_len(nla));
}
static int xfrm_xlate32(struct nlmsghdr *dst, const struct nlmsghdr *src,
struct nlattr *attrs[XFRMA_MAX+1],
size_t size, u8 type, struct netlink_ext_ack *extack)
{
size_t pos;
int i;
memcpy(dst, src, NLMSG_HDRLEN);
dst->nlmsg_len = NLMSG_HDRLEN + xfrm_msg_min[type];
memset(nlmsg_data(dst), 0, xfrm_msg_min[type]);
switch (src->nlmsg_type) {
/* Compat message has the same layout as native */
case XFRM_MSG_DELSA:
case XFRM_MSG_GETSA:
case XFRM_MSG_DELPOLICY:
case XFRM_MSG_GETPOLICY:
case XFRM_MSG_FLUSHSA:
case XFRM_MSG_FLUSHPOLICY:
case XFRM_MSG_NEWAE:
case XFRM_MSG_GETAE:
case XFRM_MSG_REPORT:
case XFRM_MSG_MIGRATE:
case XFRM_MSG_NEWSADINFO:
case XFRM_MSG_GETSADINFO:
case XFRM_MSG_NEWSPDINFO:
case XFRM_MSG_GETSPDINFO:
case XFRM_MSG_MAPPING:
memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]);
break;
/* 4 byte alignment for trailing u64 on native, but not on compat */
case XFRM_MSG_NEWSA:
case XFRM_MSG_NEWPOLICY:
case XFRM_MSG_UPDSA:
case XFRM_MSG_UPDPOLICY:
memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]);
break;
case XFRM_MSG_EXPIRE: {
const struct compat_xfrm_user_expire *src_ue = nlmsg_data(src);
struct xfrm_user_expire *dst_ue = nlmsg_data(dst);
/* compat_xfrm_user_expire has 4-byte smaller state */
memcpy(dst_ue, src_ue, sizeof(src_ue->state));
dst_ue->hard = src_ue->hard;
break;
}
case XFRM_MSG_ACQUIRE: {
const struct compat_xfrm_user_acquire *src_ua = nlmsg_data(src);
struct xfrm_user_acquire *dst_ua = nlmsg_data(dst);
memcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos));
dst_ua->aalgos = src_ua->aalgos;
dst_ua->ealgos = src_ua->ealgos;
dst_ua->calgos = src_ua->calgos;
dst_ua->seq = src_ua->seq;
break;
}
case XFRM_MSG_POLEXPIRE: {
const struct compat_xfrm_user_polexpire *src_upe = nlmsg_data(src);
struct xfrm_user_polexpire *dst_upe = nlmsg_data(dst);
/* compat_xfrm_user_polexpire has 4-byte smaller state */
memcpy(dst_upe, src_upe, sizeof(src_upe->pol));
dst_upe->hard = src_upe->hard;
break;
}
case XFRM_MSG_ALLOCSPI: {
const struct compat_xfrm_userspi_info *src_usi = nlmsg_data(src);
struct xfrm_userspi_info *dst_usi = nlmsg_data(dst);
/* compat_xfrm_user_polexpire has 4-byte smaller state */
memcpy(dst_usi, src_usi, sizeof(src_usi->info));
dst_usi->min = src_usi->min;
dst_usi->max = src_usi->max;
break;
}
default:
NL_SET_ERR_MSG(extack, "Unsupported message type");
return -EOPNOTSUPP;
}
pos = dst->nlmsg_len;
for (i = 1; i < XFRMA_MAX + 1; i++) {
int err;
if (i == XFRMA_PAD)
continue;
if (!attrs[i])
continue;
err = xfrm_xlate32_attr(dst, attrs[i], &pos, size, extack);
if (err)
return err;
}
return 0;
}
static struct nlmsghdr *xfrm_user_rcv_msg_compat(const struct nlmsghdr *h32,
int maxtype, const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
/* netlink_rcv_skb() checks if a message has full (struct nlmsghdr) */
u16 type = h32->nlmsg_type - XFRM_MSG_BASE;
struct nlattr *attrs[XFRMA_MAX+1];
struct nlmsghdr *h64;
size_t len;
int err;
BUILD_BUG_ON(ARRAY_SIZE(xfrm_msg_min) != ARRAY_SIZE(compat_msg_min));
if (type >= ARRAY_SIZE(xfrm_msg_min))
return ERR_PTR(-EINVAL);
/* Don't call parse: the message might have only nlmsg header */
if ((h32->nlmsg_type == XFRM_MSG_GETSA ||
h32->nlmsg_type == XFRM_MSG_GETPOLICY) &&
(h32->nlmsg_flags & NLM_F_DUMP))
return NULL;
err = nlmsg_parse_deprecated(h32, compat_msg_min[type], attrs,
maxtype ? : XFRMA_MAX, policy ? : compat_policy, extack);
if (err < 0)
return ERR_PTR(err);
len = xfrm_user_rcv_calculate_len64(h32, attrs);
/* The message doesn't need translation */
if (len == nlmsg_len(h32))
return NULL;
len += NLMSG_HDRLEN;
h64 = kvmalloc(len, GFP_KERNEL | __GFP_ZERO);
if (!h64)
return ERR_PTR(-ENOMEM);
err = xfrm_xlate32(h64, h32, attrs, len, type, extack);
if (err < 0) {
kvfree(h64);
return ERR_PTR(err);
}
return h64;
}
static int xfrm_user_policy_compat(u8 **pdata32, int optlen)
{
struct compat_xfrm_userpolicy_info *p = (void *)*pdata32;
u8 *src_templates, *dst_templates;
u8 *data64;
if (optlen < sizeof(*p))
return -EINVAL;
data64 = kmalloc_track_caller(optlen + 4, GFP_USER | __GFP_NOWARN);
if (!data64)
return -ENOMEM;
memcpy(data64, *pdata32, sizeof(*p));
memset(data64 + sizeof(*p), 0, 4);
src_templates = *pdata32 + sizeof(*p);
dst_templates = data64 + sizeof(*p) + 4;
memcpy(dst_templates, src_templates, optlen - sizeof(*p));
kfree(*pdata32);
*pdata32 = data64;
return 0;
}
static struct xfrm_translator xfrm_translator = {
.owner = THIS_MODULE,
.alloc_compat = xfrm_alloc_compat,
.rcv_msg_compat = xfrm_user_rcv_msg_compat,
.xlate_user_policy_sockptr = xfrm_user_policy_compat,
};
static int __init xfrm_compat_init(void)
{
return xfrm_register_translator(&xfrm_translator);
}
static void __exit xfrm_compat_exit(void)
{
xfrm_unregister_translator(&xfrm_translator);
}
module_init(xfrm_compat_init);
module_exit(xfrm_compat_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dmitry Safonov");
MODULE_DESCRIPTION("XFRM 32-bit compatibility layer");

77
net/xfrm/xfrm_state.c
View File

@ -2264,6 +2264,66 @@ static bool km_is_alive(const struct km_event *c)
return is_alive;
}
#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
static DEFINE_SPINLOCK(xfrm_translator_lock);
static struct xfrm_translator __rcu *xfrm_translator;
struct xfrm_translator *xfrm_get_translator(void)
{
struct xfrm_translator *xtr;
rcu_read_lock();
xtr = rcu_dereference(xfrm_translator);
if (unlikely(!xtr))
goto out;
if (!try_module_get(xtr->owner))
xtr = NULL;
out:
rcu_read_unlock();
return xtr;
}
EXPORT_SYMBOL_GPL(xfrm_get_translator);
void xfrm_put_translator(struct xfrm_translator *xtr)
{
module_put(xtr->owner);
}
EXPORT_SYMBOL_GPL(xfrm_put_translator);
int xfrm_register_translator(struct xfrm_translator *xtr)
{
int err = 0;
spin_lock_bh(&xfrm_translator_lock);
if (unlikely(xfrm_translator != NULL))
err = -EEXIST;
else
rcu_assign_pointer(xfrm_translator, xtr);
spin_unlock_bh(&xfrm_translator_lock);
return err;
}
EXPORT_SYMBOL_GPL(xfrm_register_translator);
int xfrm_unregister_translator(struct xfrm_translator *xtr)
{
int err = 0;
spin_lock_bh(&xfrm_translator_lock);
if (likely(xfrm_translator != NULL)) {
if (rcu_access_pointer(xfrm_translator) != xtr)
err = -EINVAL;
else
RCU_INIT_POINTER(xfrm_translator, NULL);
}
spin_unlock_bh(&xfrm_translator_lock);
synchronize_rcu();
return err;
}
EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
#endif
int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
{
int err;
@ -2271,9 +2331,6 @@ int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
struct xfrm_mgr *km;
struct xfrm_policy *pol = NULL;
if (in_compat_syscall())
return -EOPNOTSUPP;
if (sockptr_is_null(optval) && !optlen) {
xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
@ -2288,6 +2345,20 @@ int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
if (IS_ERR(data))
return PTR_ERR(data);
if (in_compat_syscall()) {
struct xfrm_translator *xtr = xfrm_get_translator();
if (!xtr)
return -EOPNOTSUPP;
err = xtr->xlate_user_policy_sockptr(&data, optlen);
xfrm_put_translator(xtr);
if (err) {
kfree(data);
return err;
}
}
err = -EINVAL;
rcu_read_lock();
list_for_each_entry_rcu(km, &xfrm_km_list, list) {

104
net/xfrm/xfrm_user.c
View File

@ -975,6 +975,7 @@ 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;
@ -992,6 +993,18 @@ static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
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;
}
@ -1006,7 +1019,6 @@ static int xfrm_dump_sa_done(struct netlink_callback *cb)
return 0;
}
static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
@ -1083,12 +1095,24 @@ 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);
}
@ -1308,6 +1332,7 @@ static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
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;
@ -1358,6 +1383,17 @@ static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
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(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
out:
@ -1764,6 +1800,7 @@ static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *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;
@ -1788,6 +1825,18 @@ static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr
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;
}
@ -2533,7 +2582,7 @@ static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
#define XMSGSIZE(type) sizeof(struct type)
static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
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),
@ -2556,10 +2605,11 @@ static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
[XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
[XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
};
EXPORT_SYMBOL_GPL(xfrm_msg_min);
#undef XMSGSIZE
static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
[XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
[XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
[XFRMA_LASTUSED] = { .type = NLA_U64},
@ -2591,6 +2641,7 @@ static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
[XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
[XFRMA_IF_ID] = { .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) },
@ -2640,11 +2691,9 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
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;
if (in_compat_syscall())
return -EOPNOTSUPP;
type = nlh->nlmsg_type;
if (type > XFRM_MSG_MAX)
return -EINVAL;
@ -2656,32 +2705,55 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
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)) {
if (link->dump == NULL)
return -EINVAL;
{
struct netlink_dump_control c = {
.start = link->start,
.dump = link->dump,
.done = link->done,
};
return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
if (link->dump == NULL) {
err = -EINVAL;
goto err;
}
err = netlink_dump_start(net->xfrm.nlsk, 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->doit == NULL) {
err = -EINVAL;
goto err;
}
err = link->doit(skb, nlh, attrs);
err:
kvfree(nlh64);
return err;
if (link->doit == NULL)
return -EINVAL;
return link->doit(skb, nlh, attrs);
}
static void xfrm_netlink_rcv(struct sk_buff *skb)

1
tools/testing/selftests/net/.gitignore vendored
View File

@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
ipsec
msg_zerocopy
socket
psock_fanout

1
tools/testing/selftests/net/Makefile
View File

@ -30,6 +30,7 @@ TEST_GEN_FILES += tcp_fastopen_backup_key
TEST_GEN_FILES += fin_ack_lat
TEST_GEN_FILES += reuseaddr_ports_exhausted
TEST_GEN_FILES += hwtstamp_config rxtimestamp timestamping txtimestamp
TEST_GEN_FILES += ipsec
TEST_GEN_PROGS = reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa
TEST_GEN_PROGS += reuseport_dualstack reuseaddr_conflict tls

2195
tools/testing/selftests/net/ipsec.c Normal file
View File

File diff suppressed because it is too large Load Diff