105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
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#include <linux/module.h>
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#include <linux/sock_diag.h>
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#include <linux/net.h>
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#include <linux/packet_diag.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include "internal.h"
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static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct packet_diag_req *req,
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u32 pid, u32 seq, u32 flags, int sk_ino)
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{
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struct nlmsghdr *nlh;
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struct packet_diag_msg *rp;
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const struct packet_sock *po = pkt_sk(sk);
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nlh = nlmsg_put(skb, pid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rp), flags);
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if (!nlh)
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return -EMSGSIZE;
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rp = nlmsg_data(nlh);
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rp->pdiag_family = AF_PACKET;
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rp->pdiag_type = sk->sk_type;
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rp->pdiag_num = ntohs(po->num);
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rp->pdiag_ino = sk_ino;
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sock_diag_save_cookie(sk, rp->pdiag_cookie);
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return nlmsg_end(skb, nlh);
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}
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static int packet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
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{
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int num = 0, s_num = cb->args[0];
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struct packet_diag_req *req;
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struct net *net;
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struct sock *sk;
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struct hlist_node *node;
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net = sock_net(skb->sk);
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req = nlmsg_data(cb->nlh);
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rcu_read_lock();
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sk_for_each_rcu(sk, node, &net->packet.sklist) {
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if (!net_eq(sock_net(sk), net))
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continue;
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if (num < s_num)
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goto next;
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if (sk_diag_fill(sk, skb, req, NETLINK_CB(cb->skb).pid,
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cb->nlh->nlmsg_seq, NLM_F_MULTI,
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sock_i_ino(sk)) < 0)
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goto done;
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next:
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num++;
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}
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done:
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rcu_read_unlock();
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cb->args[0] = num;
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return skb->len;
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}
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static int packet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
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{
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int hdrlen = sizeof(struct packet_diag_req);
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struct net *net = sock_net(skb->sk);
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struct packet_diag_req *req;
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if (nlmsg_len(h) < hdrlen)
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return -EINVAL;
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req = nlmsg_data(h);
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/* Make it possible to support protocol filtering later */
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if (req->sdiag_protocol)
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return -EINVAL;
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if (h->nlmsg_flags & NLM_F_DUMP) {
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struct netlink_dump_control c = {
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.dump = packet_diag_dump,
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};
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return netlink_dump_start(net->diag_nlsk, skb, h, &c);
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} else
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return -EOPNOTSUPP;
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}
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static const struct sock_diag_handler packet_diag_handler = {
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.family = AF_PACKET,
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.dump = packet_diag_handler_dump,
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};
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static int __init packet_diag_init(void)
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{
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return sock_diag_register(&packet_diag_handler);
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}
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static void __exit packet_diag_exit(void)
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{
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sock_diag_unregister(&packet_diag_handler);
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}
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module_init(packet_diag_init);
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module_exit(packet_diag_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17 /* AF_PACKET */);
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