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authorXin Long <lucien.xin@gmail.com>2020-06-22 16:40:29 +0800
committerSteffen Klassert <steffen.klassert@secunet.com>2020-06-24 09:13:13 +0200
commit4f47e8ab6ab796b5380f74866fa5287aca4dcc58 (patch)
treeaf80bc6678344ec8fd3592d566ac66c268923faf /net/xfrm
parent0275875530f692c725c6f993aced2eca2d6ac50c (diff)
xfrm: policy: match with both mark and mask on user interfaces
In commit ed17b8d377ea ("xfrm: fix a warning in xfrm_policy_insert_list"), it would take 'priority' to make a policy unique, and allow duplicated policies with different 'priority' to be added, which is not expected by userland, as Tobias reported in strongswan. To fix this duplicated policies issue, and also fix the issue in commit ed17b8d377ea ("xfrm: fix a warning in xfrm_policy_insert_list"), when doing add/del/get/update on user interfaces, this patch is to change to look up a policy with both mark and mask by doing: mark.v == pol->mark.v && mark.m == pol->mark.m and leave the check: (mark & pol->mark.m) == pol->mark.v for tx/rx path only. As the userland expects an exact mark and mask match to manage policies. v1->v2: - make xfrm_policy_mark_match inline and fix the changelog as Tobias suggested. Fixes: 295fae568885 ("xfrm: Allow user space manipulation of SPD mark") Fixes: ed17b8d377ea ("xfrm: fix a warning in xfrm_policy_insert_list") Reported-by: Tobias Brunner <tobias@strongswan.org> Tested-by: Tobias Brunner <tobias@strongswan.org> Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm')
-rw-r--r--net/xfrm/xfrm_policy.c39
-rw-r--r--net/xfrm/xfrm_user.c18
2 files changed, 27 insertions, 30 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 564aa6492e7c..6847b3579f54 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1433,14 +1433,10 @@ static void xfrm_policy_requeue(struct xfrm_policy *old,
spin_unlock_bh(&pq->hold_queue.lock);
}
-static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
- struct xfrm_policy *pol)
+static inline bool xfrm_policy_mark_match(const struct xfrm_mark *mark,
+ struct xfrm_policy *pol)
{
- if (policy->mark.v == pol->mark.v &&
- policy->priority == pol->priority)
- return true;
-
- return false;
+ return mark->v == pol->mark.v && mark->m == pol->mark.m;
}
static u32 xfrm_pol_bin_key(const void *data, u32 len, u32 seed)
@@ -1503,7 +1499,7 @@ static void xfrm_policy_insert_inexact_list(struct hlist_head *chain,
if (pol->type == policy->type &&
pol->if_id == policy->if_id &&
!selector_cmp(&pol->selector, &policy->selector) &&
- xfrm_policy_mark_match(policy, pol) &&
+ xfrm_policy_mark_match(&policy->mark, pol) &&
xfrm_sec_ctx_match(pol->security, policy->security) &&
!WARN_ON(delpol)) {
delpol = pol;
@@ -1538,7 +1534,7 @@ static struct xfrm_policy *xfrm_policy_insert_list(struct hlist_head *chain,
if (pol->type == policy->type &&
pol->if_id == policy->if_id &&
!selector_cmp(&pol->selector, &policy->selector) &&
- xfrm_policy_mark_match(policy, pol) &&
+ xfrm_policy_mark_match(&policy->mark, pol) &&
xfrm_sec_ctx_match(pol->security, policy->security) &&
!WARN_ON(delpol)) {
if (excl)
@@ -1610,9 +1606,8 @@ int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
EXPORT_SYMBOL(xfrm_policy_insert);
static struct xfrm_policy *
-__xfrm_policy_bysel_ctx(struct hlist_head *chain, u32 mark, u32 if_id,
- u8 type, int dir,
- struct xfrm_selector *sel,
+__xfrm_policy_bysel_ctx(struct hlist_head *chain, const struct xfrm_mark *mark,
+ u32 if_id, u8 type, int dir, struct xfrm_selector *sel,
struct xfrm_sec_ctx *ctx)
{
struct xfrm_policy *pol;
@@ -1623,7 +1618,7 @@ __xfrm_policy_bysel_ctx(struct hlist_head *chain, u32 mark, u32 if_id,
hlist_for_each_entry(pol, chain, bydst) {
if (pol->type == type &&
pol->if_id == if_id &&
- (mark & pol->mark.m) == pol->mark.v &&
+ xfrm_policy_mark_match(mark, pol) &&
!selector_cmp(sel, &pol->selector) &&
xfrm_sec_ctx_match(ctx, pol->security))
return pol;
@@ -1632,11 +1627,10 @@ __xfrm_policy_bysel_ctx(struct hlist_head *chain, u32 mark, u32 if_id,
return NULL;
}
-struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
- u8 type, int dir,
- struct xfrm_selector *sel,
- struct xfrm_sec_ctx *ctx, int delete,
- int *err)
+struct xfrm_policy *
+xfrm_policy_bysel_ctx(struct net *net, const struct xfrm_mark *mark, u32 if_id,
+ u8 type, int dir, struct xfrm_selector *sel,
+ struct xfrm_sec_ctx *ctx, int delete, int *err)
{
struct xfrm_pol_inexact_bin *bin = NULL;
struct xfrm_policy *pol, *ret = NULL;
@@ -1703,9 +1697,9 @@ struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
}
EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
-struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id,
- u8 type, int dir, u32 id, int delete,
- int *err)
+struct xfrm_policy *
+xfrm_policy_byid(struct net *net, const struct xfrm_mark *mark, u32 if_id,
+ u8 type, int dir, u32 id, int delete, int *err)
{
struct xfrm_policy *pol, *ret;
struct hlist_head *chain;
@@ -1720,8 +1714,7 @@ struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id,
ret = NULL;
hlist_for_each_entry(pol, chain, byidx) {
if (pol->type == type && pol->index == id &&
- pol->if_id == if_id &&
- (mark & pol->mark.m) == pol->mark.v) {
+ pol->if_id == if_id && xfrm_policy_mark_match(mark, pol)) {
xfrm_pol_hold(pol);
if (delete) {
*err = security_xfrm_policy_delete(
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index e6cfaa680ef3..fbb7d9d06478 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1863,7 +1863,6 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
struct km_event c;
int delete;
struct xfrm_mark m;
- u32 mark = xfrm_mark_get(attrs, &m);
u32 if_id = 0;
p = nlmsg_data(nlh);
@@ -1880,8 +1879,11 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
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, mark, if_id, type, p->dir, p->index, delete, &err);
+ 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;
@@ -1898,8 +1900,8 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err)
return err;
}
- xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir, &p->sel,
- ctx, delete, &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)
@@ -2166,7 +2168,6 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
u8 type = XFRM_POLICY_TYPE_MAIN;
int err = -ENOENT;
struct xfrm_mark m;
- u32 mark = xfrm_mark_get(attrs, &m);
u32 if_id = 0;
err = copy_from_user_policy_type(&type, attrs);
@@ -2180,8 +2181,11 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
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, mark, if_id, type, p->dir, p->index, 0, &err);
+ 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;
@@ -2198,7 +2202,7 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err)
return err;
}
- xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir,
+ xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
&p->sel, ctx, 0, &err);
security_xfrm_policy_free(ctx);
}