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udp_diag: Implement the get_exact dumping functionality

Browse source 
Do the same as TCP does -- lookup a socket in the given udp_table,
check cookie, fill the reply message with existing inet socket dumping
helper and send one back.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2011-12-09 06:24:06 +00:00 • committed by David S. Miller
parent 52b7c59bc3
commit a925aa00a5
1 changed files with 51 additions and 1 deletions
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52
net/ipv4/udp_diag.c
View file

@ -21,7 +21,57 @@
static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb, static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
const struct nlmsghdr *nlh, struct inet_diag_req *req) const struct nlmsghdr *nlh, struct inet_diag_req *req)
{ {
return 0; int err = -EINVAL;
struct sock *sk;
struct sk_buff *rep;
if (req->sdiag_family == AF_INET)
sk = __udp4_lib_lookup(&init_net,
req->id.idiag_src[0], req->id.idiag_sport,
req->id.idiag_dst[0], req->id.idiag_dport,
req->id.idiag_if, tbl);
else if (req->sdiag_family == AF_INET6)
sk = __udp6_lib_lookup(&init_net,
(struct in6_addr *)req->id.idiag_src,
req->id.idiag_sport,
(struct in6_addr *)req->id.idiag_dst,
req->id.idiag_dport,
req->id.idiag_if, tbl);
else
goto out_nosk;
err = -ENOENT;
if (sk == NULL)
goto out_nosk;
err = inet_diag_check_cookie(sk, req);
if (err)
goto out;
err = -ENOMEM;
rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
sizeof(struct inet_diag_meminfo) +
64)), GFP_KERNEL);
if (!rep)
goto out;
err = inet_sk_diag_fill(sk, NULL, rep, req,
NETLINK_CB(in_skb).pid,
nlh->nlmsg_seq, 0, nlh);
if (err < 0) {
WARN_ON(err == -EMSGSIZE);
kfree_skb(rep);
goto out;
}
err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
MSG_DONTWAIT);
if (err > 0)
err = 0;
out:
if (sk)
sock_put(sk);
out_nosk:
return err;
} }
static void udp_dump(struct udp_table *table, struct sk_buff *skb, struct netlink_callback *cb, static void udp_dump(struct udp_table *table, struct sk_buff *skb, struct netlink_callback *cb,