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-rw-r--r--include/net/netns/xfrm.h7
-rw-r--r--include/net/xfrm.h36
-rw-r--r--include/uapi/linux/xfrm.h10
-rw-r--r--net/xfrm/xfrm_policy.c16
-rw-r--r--net/xfrm/xfrm_user.c52
5 files changed, 115 insertions, 6 deletions
diff --git a/include/net/netns/xfrm.h b/include/net/netns/xfrm.h
index e946366e8ba5..88c647302977 100644
--- a/include/net/netns/xfrm.h
+++ b/include/net/netns/xfrm.h
@@ -65,6 +65,13 @@ 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
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index cbff7c2a9724..2308210793a0 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1075,6 +1075,22 @@ 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);
@@ -1088,9 +1104,13 @@ 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);
- 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);
+ 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);
}
static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
@@ -1142,9 +1162,13 @@ static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
{
struct net *net = dev_net(skb->dev);
- return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
- (skb_dst(skb)->flags & DST_NOXFRM) ||
- __xfrm_route_forward(skb, family);
+ 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);
}
static inline int xfrm4_route_forward(struct sk_buff *skb)
diff --git a/include/uapi/linux/xfrm.h b/include/uapi/linux/xfrm.h
index ffc6a5391bb7..6e8095106192 100644
--- a/include/uapi/linux/xfrm.h
+++ b/include/uapi/linux/xfrm.h
@@ -213,6 +213,11 @@ 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
@@ -508,6 +513,11 @@ 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
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 827d84255021..d5cb082e11fc 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -3165,6 +3165,11 @@ 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;
@@ -3553,6 +3558,11 @@ 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);
@@ -3607,6 +3617,12 @@ 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;
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index b47d613409b7..4eafd1130c3e 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1961,6 +1961,54 @@ 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)
{
@@ -2664,6 +2712,8 @@ 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);
@@ -2743,6 +2793,8 @@ 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,
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-16 11:04:06 +0300