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authorTomasz Grobelny <tomasz@grobelny.oswiecenia.net>2010-12-04 13:39:13 +0100
committerGerrit Renker <gerrit@erg.abdn.ac.uk>2010-12-07 13:47:12 +0100
commit04910265078f08a73208beab70ed2a3cce4a919f (patch)
treecc7e1c927ceda1ddf5f86d50f8ee22a1a4e32fe6 /net/dccp/qpolicy.c
parent871a2c16c21b988688b4ab1a78eadd969765c0a3 (diff)
downloadlinux-04910265078f08a73208beab70ed2a3cce4a919f.tar.gz
dccp qpolicy: Parameter checking of cmsg qpolicy parameters
Ensure that cmsg->cmsg_type value is valid for qpolicy that is currently in use. Signed-off-by: Tomasz Grobelny <tomasz@grobelny.oswiecenia.net> Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Diffstat (limited to 'net/dccp/qpolicy.c')
-rw-r--r--net/dccp/qpolicy.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/net/dccp/qpolicy.c b/net/dccp/qpolicy.c
index 4b0fd6b11f6..63c30bfa470 100644
--- a/net/dccp/qpolicy.c
+++ b/net/dccp/qpolicy.c
@@ -73,17 +73,20 @@ static struct dccp_qpolicy_operations {
void (*push) (struct sock *sk, struct sk_buff *skb);
bool (*full) (struct sock *sk);
struct sk_buff* (*top) (struct sock *sk);
+ __be32 params;
} qpol_table[DCCPQ_POLICY_MAX] = {
[DCCPQ_POLICY_SIMPLE] = {
- .push = qpolicy_simple_push,
- .full = qpolicy_simple_full,
- .top = qpolicy_simple_top,
+ .push = qpolicy_simple_push,
+ .full = qpolicy_simple_full,
+ .top = qpolicy_simple_top,
+ .params = 0,
},
[DCCPQ_POLICY_PRIO] = {
- .push = qpolicy_simple_push,
- .full = qpolicy_prio_full,
- .top = qpolicy_prio_best_skb,
+ .push = qpolicy_simple_push,
+ .full = qpolicy_prio_full,
+ .top = qpolicy_prio_best_skb,
+ .params = DCCP_SCM_PRIORITY,
},
};
@@ -124,3 +127,11 @@ struct sk_buff *dccp_qpolicy_pop(struct sock *sk)
}
return skb;
}
+
+bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param)
+{
+ /* check if exactly one bit is set */
+ if (!param || (param & (param - 1)))
+ return false;
+ return (qpol_table[dccp_sk(sk)->dccps_qpolicy].params & param) == param;
+}