diff options
| author | Tomasz Grobelny <tomasz@grobelny.oswiecenia.net> | 2008-09-04 05:30:19 (GMT) |
|---|---|---|
| committer | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-09-04 05:45:40 (GMT) |
| commit | 7d1af6a8d935678248d057564e75e1452409a53c (patch) | |
| tree | 06ea5f0d3e819e99609df3ef741574cdfac4aab9 | |
| parent | d6da3511d6b558d0b017777b61dc08b8fbc06ea4 (diff) | |
| download | linux-7d1af6a8d935678248d057564e75e1452409a53c.tar.xz | |
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>
| -rw-r--r-- | net/dccp/dccp.h | 1 | ||||
| -rw-r--r-- | net/dccp/proto.c | 4 | ||||
| -rw-r--r-- | net/dccp/qpolicy.c | 23 |
3 files changed, 22 insertions, 6 deletions
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h index ce2dd6f..1585fa2 100644 --- a/net/dccp/dccp.h +++ b/net/dccp/dccp.h @@ -242,6 +242,7 @@ extern bool dccp_qpolicy_full(struct sock *sk); extern void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb); extern struct sk_buff *dccp_qpolicy_top(struct sock *sk); extern struct sk_buff *dccp_qpolicy_pop(struct sock *sk); +extern bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param); /* * TX Packet Output and TX Timers diff --git a/net/dccp/proto.c b/net/dccp/proto.c index b56efdd..a3caa11 100644 --- a/net/dccp/proto.c +++ b/net/dccp/proto.c @@ -735,6 +735,10 @@ static int dccp_msghdr_parse(struct msghdr *msg, struct sk_buff *skb) if (cmsg->cmsg_level != SOL_DCCP) continue; + if (cmsg->cmsg_type <= DCCP_SCM_QPOLICY_MAX && + !dccp_qpolicy_param_ok(skb->sk, cmsg->cmsg_type)) + return -EINVAL; + switch (cmsg->cmsg_type) { case DCCP_SCM_PRIORITY: if (cmsg->cmsg_len != CMSG_LEN(sizeof(__u32))) diff --git a/net/dccp/qpolicy.c b/net/dccp/qpolicy.c index 414696b..27383f8 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) skb_unlink(skb, &sk->sk_write_queue); 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; +} |