diff options
| author | Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2013-04-25 06:53:54 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-04-29 13:21:30 -0400 |
| commit | e8d9612c181b1a68ba5f71384629343466f1bd13 (patch) | |
| tree | 16093300e9da78c1c3e272283ae4886d7b3984e8 /net | |
| parent | 76d0eeb1a1579453cfd7c4da22004d4b34187ab4 (diff) | |
sock_diag: allow to dump bpf filters
This patch allows to dump BPF filters attached to a socket with
SO_ATTACH_FILTER.
Note that we check CAP_SYS_ADMIN before allowing to dump this info.
For now, only AF_PACKET sockets use this feature.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/sock_diag.c | 33 | ||||
| -rw-r--r-- | net/packet/diag.c | 4 |
2 files changed, 37 insertions, 0 deletions
diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c index a29e90cf36b..d5bef0b0f63 100644 --- a/net/core/sock_diag.c +++ b/net/core/sock_diag.c @@ -49,6 +49,39 @@ int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype) } EXPORT_SYMBOL_GPL(sock_diag_put_meminfo); +int sock_diag_put_filterinfo(struct user_namespace *user_ns, struct sock *sk, + struct sk_buff *skb, int attrtype) +{ + struct nlattr *attr; + struct sk_filter *filter; + unsigned int len; + int err = 0; + + if (!ns_capable(user_ns, CAP_NET_ADMIN)) { + nla_reserve(skb, attrtype, 0); + return 0; + } + + rcu_read_lock(); + + filter = rcu_dereference(sk->sk_filter); + len = filter ? filter->len * sizeof(struct sock_filter) : 0; + + attr = nla_reserve(skb, attrtype, len); + if (attr == NULL) { + err = -EMSGSIZE; + goto out; + } + + if (filter) + memcpy(nla_data(attr), filter->insns, len); + +out: + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(sock_diag_put_filterinfo); + void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) { mutex_lock(&sock_diag_table_mutex); diff --git a/net/packet/diag.c b/net/packet/diag.c index 822fe9b33a4..a9584a2f6d6 100644 --- a/net/packet/diag.c +++ b/net/packet/diag.c @@ -170,6 +170,10 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, sock_diag_put_meminfo(sk, skb, PACKET_DIAG_MEMINFO)) goto out_nlmsg_trim; + if ((req->pdiag_show & PACKET_SHOW_FILTER) && + sock_diag_put_filterinfo(user_ns, sk, skb, PACKET_DIAG_FILTER)) + goto out_nlmsg_trim; + return nlmsg_end(skb, nlh); out_nlmsg_trim: |