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| author | Tomasz Grobelny <tomasz@grobelny.oswiecenia.net> | 2010-12-04 13:39:13 +0100 |
|---|---|---|
| committer | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2010-12-07 13:47:12 +0100 |
| commit | 04910265078f08a73208beab70ed2a3cce4a919f (patch) | |
| tree | cc7e1c927ceda1ddf5f86d50f8ee22a1a4e32fe6 /net/dccp | |
| parent | 871a2c16c21b988688b4ab1a78eadd969765c0a3 (diff) | |
| download | lwn-04910265078f08a73208beab70ed2a3cce4a919f.tar.gz lwn-04910265078f08a73208beab70ed2a3cce4a919f.zip | |
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')
| -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 d008da91cec2..48ad5d9da7cb 100644 --- a/net/dccp/dccp.h +++ b/net/dccp/dccp.h @@ -251,6 +251,7 @@ 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 d6a224982bb5..152975d942d9 100644 --- a/net/dccp/proto.c +++ b/net/dccp/proto.c @@ -726,6 +726,10 @@ 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 4b0fd6b11f6d..63c30bfa4703 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; +} |