[mirror_ubuntu-bionic-kernel.git] / net / packet / diag.c

#include <linux/module.h>
#include <linux/sock_diag.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/packet_diag.h>
#include <net/net_namespace.h>
#include <net/sock.h>

#include "internal.h"

static int pdiag_put_info(const struct packet_sock *po, struct sk_buff *nlskb)
{
	struct packet_diag_info pinfo;

	pinfo.pdi_index = po->ifindex;
	pinfo.pdi_version = po->tp_version;
	pinfo.pdi_reserve = po->tp_reserve;
	pinfo.pdi_copy_thresh = po->copy_thresh;
	pinfo.pdi_tstamp = po->tp_tstamp;

	pinfo.pdi_flags = 0;
	if (po->running)
		pinfo.pdi_flags |= PDI_RUNNING;
	if (po->auxdata)
		pinfo.pdi_flags |= PDI_AUXDATA;
	if (po->origdev)
		pinfo.pdi_flags |= PDI_ORIGDEV;
	if (po->has_vnet_hdr)
		pinfo.pdi_flags |= PDI_VNETHDR;
	if (po->tp_loss)
		pinfo.pdi_flags |= PDI_LOSS;

	return nla_put(nlskb, PACKET_DIAG_INFO, sizeof(pinfo), &pinfo);
}

static int pdiag_put_mclist(const struct packet_sock *po, struct sk_buff *nlskb)
{
	struct nlattr *mca;
	struct packet_mclist *ml;

	mca = nla_nest_start(nlskb, PACKET_DIAG_MCLIST);
	if (!mca)
		return -EMSGSIZE;

	rtnl_lock();
	for (ml = po->mclist; ml; ml = ml->next) {
		struct packet_diag_mclist *dml;

		dml = nla_reserve_nohdr(nlskb, sizeof(*dml));
		if (!dml) {
			rtnl_unlock();
			nla_nest_cancel(nlskb, mca);
			return -EMSGSIZE;
		}

		dml->pdmc_index = ml->ifindex;
		dml->pdmc_type = ml->type;
		dml->pdmc_alen = ml->alen;
		dml->pdmc_count = ml->count;
		BUILD_BUG_ON(sizeof(dml->pdmc_addr) != sizeof(ml->addr));
		memcpy(dml->pdmc_addr, ml->addr, sizeof(ml->addr));
	}

	rtnl_unlock();
	nla_nest_end(nlskb, mca);

	return 0;
}

static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct packet_diag_req *req,
		u32 pid, u32 seq, u32 flags, int sk_ino)
{
	struct nlmsghdr *nlh;
	struct packet_diag_msg *rp;
	const struct packet_sock *po = pkt_sk(sk);

	nlh = nlmsg_put(skb, pid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rp), flags);
	if (!nlh)
		return -EMSGSIZE;

	rp = nlmsg_data(nlh);
	rp->pdiag_family = AF_PACKET;
	rp->pdiag_type = sk->sk_type;
	rp->pdiag_num = ntohs(po->num);
	rp->pdiag_ino = sk_ino;
	sock_diag_save_cookie(sk, rp->pdiag_cookie);

	if ((req->pdiag_show & PACKET_SHOW_INFO) &&
			pdiag_put_info(po, skb))
		goto out_nlmsg_trim;

	if ((req->pdiag_show & PACKET_SHOW_MCLIST) &&
			pdiag_put_mclist(po, skb))
		goto out_nlmsg_trim;

	return nlmsg_end(skb, nlh);

out_nlmsg_trim:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

static int packet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	int num = 0, s_num = cb->args[0];
	struct packet_diag_req *req;
	struct net *net;
	struct sock *sk;
	struct hlist_node *node;

	net = sock_net(skb->sk);
	req = nlmsg_data(cb->nlh);

	rcu_read_lock();
	sk_for_each_rcu(sk, node, &net->packet.sklist) {
		if (!net_eq(sock_net(sk), net))
			continue;
		if (num < s_num)
			goto next;

		if (sk_diag_fill(sk, skb, req, NETLINK_CB(cb->skb).pid,
					cb->nlh->nlmsg_seq, NLM_F_MULTI,
					sock_i_ino(sk)) < 0)
			goto done;
next:
		num++;
	}
done:
	rcu_read_unlock();
	cb->args[0] = num;

	return skb->len;
}

static int packet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
{
	int hdrlen = sizeof(struct packet_diag_req);
	struct net *net = sock_net(skb->sk);
	struct packet_diag_req *req;

	if (nlmsg_len(h) < hdrlen)
		return -EINVAL;

	req = nlmsg_data(h);
	/* Make it possible to support protocol filtering later */
	if (req->sdiag_protocol)
		return -EINVAL;

	if (h->nlmsg_flags & NLM_F_DUMP) {
		struct netlink_dump_control c = {
			.dump = packet_diag_dump,
		};
		return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	} else
		return -EOPNOTSUPP;
}

static const struct sock_diag_handler packet_diag_handler = {
	.family = AF_PACKET,
	.dump = packet_diag_handler_dump,
};

static int __init packet_diag_init(void)
{
	return sock_diag_register(&packet_diag_handler);
}

static void __exit packet_diag_exit(void)
{
	sock_diag_unregister(&packet_diag_handler);
}

module_init(packet_diag_init);
module_exit(packet_diag_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17 /* AF_PACKET */);
Commit	Line	Data
96ec6327 PE	1	#include <linux/module.h>
	2	#include <linux/sock_diag.h>
	3	#include <linux/net.h>
eea68e2f	4	#include <linux/netdevice.h>
96ec6327 PE	5	#include <linux/packet_diag.h>
	6	#include <net/net_namespace.h>
	7	#include <net/sock.h>
	8
	9	#include "internal.h"
	10
8a360be0 PE	11	static int pdiag_put_info(const struct packet_sock po, struct sk_buff nlskb)
	12	{
	13	struct packet_diag_info pinfo;
	14
	15	pinfo.pdi_index = po->ifindex;
	16	pinfo.pdi_version = po->tp_version;
	17	pinfo.pdi_reserve = po->tp_reserve;
	18	pinfo.pdi_copy_thresh = po->copy_thresh;
	19	pinfo.pdi_tstamp = po->tp_tstamp;
	20
	21	pinfo.pdi_flags = 0;
	22	if (po->running)
	23	pinfo.pdi_flags \|= PDI_RUNNING;
	24	if (po->auxdata)
	25	pinfo.pdi_flags \|= PDI_AUXDATA;
	26	if (po->origdev)
	27	pinfo.pdi_flags \|= PDI_ORIGDEV;
	28	if (po->has_vnet_hdr)
	29	pinfo.pdi_flags \|= PDI_VNETHDR;
	30	if (po->tp_loss)
	31	pinfo.pdi_flags \|= PDI_LOSS;
	32
	33	return nla_put(nlskb, PACKET_DIAG_INFO, sizeof(pinfo), &pinfo);
	34	}
	35
eea68e2f PE	36	static int pdiag_put_mclist(const struct packet_sock po, struct sk_buff nlskb)
	37	{
	38	struct nlattr *mca;
	39	struct packet_mclist *ml;
	40
	41	mca = nla_nest_start(nlskb, PACKET_DIAG_MCLIST);
	42	if (!mca)
	43	return -EMSGSIZE;
	44
	45	rtnl_lock();
	46	for (ml = po->mclist; ml; ml = ml->next) {
	47	struct packet_diag_mclist *dml;
	48
	49	dml = nla_reserve_nohdr(nlskb, sizeof(*dml));
	50	if (!dml) {
	51	rtnl_unlock();
	52	nla_nest_cancel(nlskb, mca);
	53	return -EMSGSIZE;
	54	}
	55
	56	dml->pdmc_index = ml->ifindex;
	57	dml->pdmc_type = ml->type;
	58	dml->pdmc_alen = ml->alen;
	59	dml->pdmc_count = ml->count;
	60	BUILD_BUG_ON(sizeof(dml->pdmc_addr) != sizeof(ml->addr));
	61	memcpy(dml->pdmc_addr, ml->addr, sizeof(ml->addr));
	62	}
	63
	64	rtnl_unlock();
	65	nla_nest_end(nlskb, mca);
	66
	67	return 0;
	68	}
	69
96ec6327 PE	70	static int sk_diag_fill(struct sock sk, struct sk_buff skb, struct packet_diag_req *req,
	71	u32 pid, u32 seq, u32 flags, int sk_ino)
	72	{
	73	struct nlmsghdr *nlh;
	74	struct packet_diag_msg *rp;
	75	const struct packet_sock *po = pkt_sk(sk);
	76
	77	nlh = nlmsg_put(skb, pid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rp), flags);
	78	if (!nlh)
	79	return -EMSGSIZE;
	80
	81	rp = nlmsg_data(nlh);
	82	rp->pdiag_family = AF_PACKET;
	83	rp->pdiag_type = sk->sk_type;
	84	rp->pdiag_num = ntohs(po->num);
	85	rp->pdiag_ino = sk_ino;
	86	sock_diag_save_cookie(sk, rp->pdiag_cookie);
	87
8a360be0 PE	88	if ((req->pdiag_show & PACKET_SHOW_INFO) &&
	89	pdiag_put_info(po, skb))
	90	goto out_nlmsg_trim;
	91
eea68e2f PE	92	if ((req->pdiag_show & PACKET_SHOW_MCLIST) &&
	93	pdiag_put_mclist(po, skb))
	94	goto out_nlmsg_trim;
	95
96ec6327	96	return nlmsg_end(skb, nlh);
8a360be0 PE	97
	98	out_nlmsg_trim:
	99	nlmsg_cancel(skb, nlh);
	100	return -EMSGSIZE;
96ec6327 PE	101	}
	102
	103	static int packet_diag_dump(struct sk_buff skb, struct netlink_callback cb)
	104	{
	105	int num = 0, s_num = cb->args[0];
	106	struct packet_diag_req *req;
	107	struct net *net;
	108	struct sock *sk;
	109	struct hlist_node *node;
	110
	111	net = sock_net(skb->sk);
	112	req = nlmsg_data(cb->nlh);
	113
	114	rcu_read_lock();
	115	sk_for_each_rcu(sk, node, &net->packet.sklist) {
	116	if (!net_eq(sock_net(sk), net))
	117	continue;
	118	if (num < s_num)
	119	goto next;
	120
	121	if (sk_diag_fill(sk, skb, req, NETLINK_CB(cb->skb).pid,
	122	cb->nlh->nlmsg_seq, NLM_F_MULTI,
	123	sock_i_ino(sk)) < 0)
	124	goto done;
	125	next:
	126	num++;
	127	}
	128	done:
	129	rcu_read_unlock();
	130	cb->args[0] = num;
	131
	132	return skb->len;
	133	}
	134
	135	static int packet_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
	136	{
	137	int hdrlen = sizeof(struct packet_diag_req);
	138	struct net *net = sock_net(skb->sk);
	139	struct packet_diag_req *req;
	140
	141	if (nlmsg_len(h) < hdrlen)
	142	return -EINVAL;
	143
	144	req = nlmsg_data(h);
	145	/* Make it possible to support protocol filtering later */
	146	if (req->sdiag_protocol)
	147	return -EINVAL;
	148
	149	if (h->nlmsg_flags & NLM_F_DUMP) {
	150	struct netlink_dump_control c = {
	151	.dump = packet_diag_dump,
	152	};
	153	return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	154	} else
	155	return -EOPNOTSUPP;
	156	}
	157
	158	static const struct sock_diag_handler packet_diag_handler = {
	159	.family = AF_PACKET,
	160	.dump = packet_diag_handler_dump,
	161	};
	162
	163	static int __init packet_diag_init(void)
	164	{
165	return sock_diag_register(&packet_diag_handler);
166	}
167
168	static void __exit packet_diag_exit(void)
169	{
170	sock_diag_unregister(&packet_diag_handler);
171	}
172
173	module_init(packet_diag_init);
174	module_exit(packet_diag_exit);
175	MODULE_LICENSE("GPL");
176	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17 /* AF_PACKET */);