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Revert "xfrm: Add possibility to set the default to block if we have no policy"

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This reverts commit 5b7f84b1f9 which is
commit 2d151d39073aff498358543801fca0f670fea981 upstream.

It breaks the Android kernel ABI and if this really needs to be added to
Android, it must come back in a format in the future that does not break
the abi.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ic222a9dfeaa3775f1173b4cd13de7e9ae959ccd9
This commit is contained in:
Greg Kroah-Hartman
2022-06-24 10:03:05 +02:00
parent e21944a82a
commit 73c2a811f6
5 changed files with 6 additions and 115 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
include/net/netns/xfrm.h
View File

@@ -65,13 +65,6 @@ struct netns_xfrm {
u32 sysctl_aevent_rseqth;
int sysctl_larval_drop;
u32 sysctl_acq_expires;
u8 policy_default;
#define XFRM_POL_DEFAULT_IN 1
#define XFRM_POL_DEFAULT_OUT 2
#define XFRM_POL_DEFAULT_FWD 4
#define XFRM_POL_DEFAULT_MASK 7
#ifdef CONFIG_SYSCTL
struct ctl_table_header *sysctl_hdr;
#endif

36
include/net/xfrm.h
View File

@@ -1083,22 +1083,6 @@ xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, un
}
#ifdef CONFIG_XFRM
static inline bool
xfrm_default_allow(struct net *net, int dir)
{
u8 def = net->xfrm.policy_default;
switch (dir) {
case XFRM_POLICY_IN:
return def & XFRM_POL_DEFAULT_IN ? false : true;
case XFRM_POLICY_OUT:
return def & XFRM_POL_DEFAULT_OUT ? false : true;
case XFRM_POLICY_FWD:
return def & XFRM_POL_DEFAULT_FWD ? false : true;
}
return false;
}
int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
unsigned short family);
@@ -1112,13 +1096,9 @@ static inline int __xfrm_policy_check2(struct sock *sk, int dir,
if (sk && sk->sk_policy[XFRM_POLICY_IN])
return __xfrm_policy_check(sk, ndir, skb, family);
if (xfrm_default_allow(net, dir))
return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
(skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) ||
__xfrm_policy_check(sk, ndir, skb, family);
else
return (skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) ||
__xfrm_policy_check(sk, ndir, skb, family);
return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
(skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) ||
__xfrm_policy_check(sk, ndir, skb, family);
}
static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
@@ -1170,13 +1150,9 @@ static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
{
struct net *net = dev_net(skb->dev);
if (xfrm_default_allow(net, XFRM_POLICY_FWD))
return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
(skb_dst(skb)->flags & DST_NOXFRM) ||
__xfrm_route_forward(skb, family);
else
return (skb_dst(skb)->flags & DST_NOXFRM) ||
__xfrm_route_forward(skb, family);
return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
(skb_dst(skb)->flags & DST_NOXFRM) ||
__xfrm_route_forward(skb, family);
}
static inline int xfrm4_route_forward(struct sk_buff *skb)

10
include/uapi/linux/xfrm.h
View File

@@ -213,11 +213,6 @@ enum {
XFRM_MSG_GETSPDINFO,
#define XFRM_MSG_GETSPDINFO XFRM_MSG_GETSPDINFO
XFRM_MSG_SETDEFAULT,
#define XFRM_MSG_SETDEFAULT XFRM_MSG_SETDEFAULT
XFRM_MSG_GETDEFAULT,
#define XFRM_MSG_GETDEFAULT XFRM_MSG_GETDEFAULT
XFRM_MSG_MAPPING,
#define XFRM_MSG_MAPPING XFRM_MSG_MAPPING
__XFRM_MSG_MAX
@@ -519,11 +514,6 @@ struct xfrm_user_offload {
#define XFRM_OFFLOAD_IPV6 1
#define XFRM_OFFLOAD_INBOUND 2
struct xfrm_userpolicy_default {
__u8 dirmask;
__u8 action;
};
#ifndef __KERNEL__
/* backwards compatibility for userspace */
#define XFRMGRP_ACQUIRE 1

16
net/xfrm/xfrm_policy.c
View File

@@ -3166,11 +3166,6 @@ ok:
return dst;
nopol:
if (!(dst_orig->dev->flags & IFF_LOOPBACK) &&
!xfrm_default_allow(net, dir)) {
err = -EPERM;
goto error;
}
if (!(flags & XFRM_LOOKUP_ICMP)) {
dst = dst_orig;
goto ok;
@@ -3618,11 +3613,6 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
}
if (!pol) {
if (!xfrm_default_allow(net, dir)) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
return 0;
}
if (sp && secpath_has_nontransport(sp, 0, &xerr_idx)) {
xfrm_secpath_reject(xerr_idx, skb, &fl);
XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
@@ -3677,12 +3667,6 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
tpp[ti++] = &pols[pi]->xfrm_vec[i];
}
xfrm_nr = ti;
if (!xfrm_default_allow(net, dir) && !xfrm_nr) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
goto reject;
}
if (npols > 1) {
xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
tpp = stp;

52
net/xfrm/xfrm_user.c
View File

@@ -1901,54 +1901,6 @@ static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
return skb;
}
static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr **attrs)
{
struct net *net = sock_net(skb->sk);
struct xfrm_userpolicy_default *up = nlmsg_data(nlh);
u8 dirmask = (1 << up->dirmask) & XFRM_POL_DEFAULT_MASK;
u8 old_default = net->xfrm.policy_default;
net->xfrm.policy_default = (old_default & (0xff ^ dirmask))
| (up->action << up->dirmask);
rt_genid_bump_all(net);
return 0;
}
static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr **attrs)
{
struct sk_buff *r_skb;
struct nlmsghdr *r_nlh;
struct net *net = sock_net(skb->sk);
struct xfrm_userpolicy_default *r_up, *up;
int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));
u32 portid = NETLINK_CB(skb).portid;
u32 seq = nlh->nlmsg_seq;
up = nlmsg_data(nlh);
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->action = ((net->xfrm.policy_default & (1 << up->dirmask)) >> up->dirmask);
r_up->dirmask = up->dirmask;
nlmsg_end(r_skb, r_nlh);
return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid);
}
static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr **attrs)
{
@@ -2656,8 +2608,6 @@ const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
[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);
@@ -2737,8 +2687,6 @@ static const struct xfrm_link {
.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_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,