[linux-block.git] / net / sctp / diag.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* SCTP kernel implementation
 * (C) Copyright Red Hat Inc. 2017
 *
 * This file is part of the SCTP kernel implementation
 *
 * These functions implement sctp diag support.
 *
 * Please send any bug reports or fixes you make to the
 * email addresched(es):
 *    lksctp developers <linux-sctp@vger.kernel.org>
 *
 * Written or modified by:
 *    Xin Long <lucien.xin@gmail.com>
 */

#include <linux/module.h>
#include <linux/inet_diag.h>
#include <linux/sock_diag.h>
#include <net/sctp/sctp.h>

static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
			       void *info);

/* define some functions to make asoc/ep fill look clean */
static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
					struct sock *sk,
					struct sctp_association *asoc)
{
	union sctp_addr laddr, paddr;
	struct dst_entry *dst;
	struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer;

	laddr = list_entry(asoc->base.bind_addr.address_list.next,
			   struct sctp_sockaddr_entry, list)->a;
	paddr = asoc->peer.primary_path->ipaddr;
	dst = asoc->peer.primary_path->dst;

	r->idiag_family = sk->sk_family;
	r->id.idiag_sport = htons(asoc->base.bind_addr.port);
	r->id.idiag_dport = htons(asoc->peer.port);
	r->id.idiag_if = dst ? dst->dev->ifindex : 0;
	sock_diag_save_cookie(sk, r->id.idiag_cookie);

#if IS_ENABLED(CONFIG_IPV6)
	if (sk->sk_family == AF_INET6) {
		*(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr;
		*(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr;
	} else
#endif
	{
		memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
		memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));

		r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
		r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
	}

	r->idiag_state = asoc->state;
	if (timer_pending(t3_rtx)) {
		r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
		r->idiag_retrans = asoc->rtx_data_chunks;
		r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies);
	}
}

static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
					 struct list_head *address_list)
{
	struct sctp_sockaddr_entry *laddr;
	int addrlen = sizeof(struct sockaddr_storage);
	int addrcnt = 0;
	struct nlattr *attr;
	void *info = NULL;

	list_for_each_entry_rcu(laddr, address_list, list)
		addrcnt++;

	attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
	if (!attr)
		return -EMSGSIZE;

	info = nla_data(attr);
	list_for_each_entry_rcu(laddr, address_list, list) {
		memcpy(info, &laddr->a, sizeof(laddr->a));
		memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a));
		info += addrlen;
	}

	return 0;
}

static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
					struct sctp_association *asoc)
{
	int addrlen = sizeof(struct sockaddr_storage);
	struct sctp_transport *from;
	struct nlattr *attr;
	void *info = NULL;

	attr = nla_reserve(skb, INET_DIAG_PEERS,
			   addrlen * asoc->peer.transport_count);
	if (!attr)
		return -EMSGSIZE;

	info = nla_data(attr);
	list_for_each_entry(from, &asoc->peer.transport_addr_list,
			    transports) {
		memcpy(info, &from->ipaddr, sizeof(from->ipaddr));
		memset(info + sizeof(from->ipaddr), 0,
		       addrlen - sizeof(from->ipaddr));
		info += addrlen;
	}

	return 0;
}

/* sctp asoc/ep fill*/
static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc,
			       struct sk_buff *skb,
			       const struct inet_diag_req_v2 *req,
			       struct user_namespace *user_ns,
			       int portid, u32 seq, u16 nlmsg_flags,
			       const struct nlmsghdr *unlh,
			       bool net_admin)
{
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
	struct list_head *addr_list;
	struct inet_diag_msg *r;
	struct nlmsghdr  *nlh;
	int ext = req->idiag_ext;
	struct sctp_infox infox;
	void *info = NULL;

	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
			nlmsg_flags);
	if (!nlh)
		return -EMSGSIZE;

	r = nlmsg_data(nlh);
	BUG_ON(!sk_fullsock(sk));

	r->idiag_timer = 0;
	r->idiag_retrans = 0;
	r->idiag_expires = 0;
	if (asoc) {
		inet_diag_msg_sctpasoc_fill(r, sk, asoc);
	} else {
		inet_diag_msg_common_fill(r, sk);
		r->idiag_state = sk->sk_state;
	}

	if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
		goto errout;

	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
		u32 mem[SK_MEMINFO_VARS];
		int amt;

		if (asoc && asoc->ep->sndbuf_policy)
			amt = asoc->sndbuf_used;
		else
			amt = sk_wmem_alloc_get(sk);
		mem[SK_MEMINFO_WMEM_ALLOC] = amt;
		if (asoc && asoc->ep->rcvbuf_policy)
			amt = atomic_read(&asoc->rmem_alloc);
		else
			amt = sk_rmem_alloc_get(sk);
		mem[SK_MEMINFO_RMEM_ALLOC] = amt;
		mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
		mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
		mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
		mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
		mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
		mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
		mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);

		if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
			goto errout;
	}

	if (ext & (1 << (INET_DIAG_INFO - 1))) {
		struct nlattr *attr;

		attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
					 sizeof(struct sctp_info),
					 INET_DIAG_PAD);
		if (!attr)
			goto errout;

		info = nla_data(attr);
	}
	infox.sctpinfo = (struct sctp_info *)info;
	infox.asoc = asoc;
	sctp_diag_get_info(sk, r, &infox);

	addr_list = asoc ? &asoc->base.bind_addr.address_list
			 : &ep->base.bind_addr.address_list;
	if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
		goto errout;

	if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
		if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
			goto errout;

	if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
		goto errout;

	nlmsg_end(skb, nlh);
	return 0;

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

/* callback and param */
struct sctp_comm_param {
	struct sk_buff *skb;
	struct netlink_callback *cb;
	const struct inet_diag_req_v2 *r;
	const struct nlmsghdr *nlh;
	bool net_admin;
};

static size_t inet_assoc_attr_size(struct sctp_association *asoc)
{
	int addrlen = sizeof(struct sockaddr_storage);
	int addrcnt = 0;
	struct sctp_sockaddr_entry *laddr;

	list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
				list)
		addrcnt++;

	return	  nla_total_size(sizeof(struct sctp_info))
		+ nla_total_size(addrlen * asoc->peer.transport_count)
		+ nla_total_size(addrlen * addrcnt)
		+ nla_total_size(sizeof(struct inet_diag_msg))
		+ inet_diag_msg_attrs_size()
		+ nla_total_size(sizeof(struct inet_diag_meminfo))
		+ 64;
}

static int sctp_sock_dump_one(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p)
{
	struct sctp_association *assoc = tsp->asoc;
	struct sctp_comm_param *commp = p;
	struct sock *sk = ep->base.sk;
	const struct inet_diag_req_v2 *req = commp->r;
	struct sk_buff *skb = commp->skb;
	struct sk_buff *rep;
	int err;

	err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
	if (err)
		return err;

	rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
	if (!rep)
		return -ENOMEM;

	lock_sock(sk);
	if (ep != assoc->ep) {
		err = -EAGAIN;
		goto out;
	}

	err = inet_sctp_diag_fill(sk, assoc, rep, req, sk_user_ns(NETLINK_CB(skb).sk),
				  NETLINK_CB(skb).portid, commp->nlh->nlmsg_seq, 0,
				  commp->nlh, commp->net_admin);
	if (err < 0) {
		WARN_ON(err == -EMSGSIZE);
		goto out;
	}
	release_sock(sk);

	return nlmsg_unicast(sock_net(skb->sk)->diag_nlsk, rep, NETLINK_CB(skb).portid);

out:
	release_sock(sk);
	kfree_skb(rep);
	return err;
}

static int sctp_sock_dump(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p)
{
	struct sctp_comm_param *commp = p;
	struct sock *sk = ep->base.sk;
	struct sk_buff *skb = commp->skb;
	struct netlink_callback *cb = commp->cb;
	const struct inet_diag_req_v2 *r = commp->r;
	struct sctp_association *assoc;
	int err = 0;

	lock_sock(sk);
	if (ep != tsp->asoc->ep)
		goto release;
	list_for_each_entry(assoc, &ep->asocs, asocs) {
		if (cb->args[4] < cb->args[1])
			goto next;

		if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
		    r->id.idiag_sport)
			goto next;
		if (r->id.idiag_dport != htons(assoc->peer.port) &&
		    r->id.idiag_dport)
			goto next;

		if (!cb->args[3] &&
		    inet_sctp_diag_fill(sk, NULL, skb, r,
					sk_user_ns(NETLINK_CB(cb->skb).sk),
					NETLINK_CB(cb->skb).portid,
					cb->nlh->nlmsg_seq,
					NLM_F_MULTI, cb->nlh,
					commp->net_admin) < 0) {
			err = 1;
			goto release;
		}
		cb->args[3] = 1;

		if (inet_sctp_diag_fill(sk, assoc, skb, r,
					sk_user_ns(NETLINK_CB(cb->skb).sk),
					NETLINK_CB(cb->skb).portid,
					cb->nlh->nlmsg_seq, 0, cb->nlh,
					commp->net_admin) < 0) {
			err = 1;
			goto release;
		}
next:
		cb->args[4]++;
	}
	cb->args[1] = 0;
	cb->args[3] = 0;
	cb->args[4] = 0;
release:
	release_sock(sk);
	return err;
}

static int sctp_sock_filter(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p)
{
	struct sctp_comm_param *commp = p;
	struct sock *sk = ep->base.sk;
	const struct inet_diag_req_v2 *r = commp->r;

	/* find the ep only once through the transports by this condition */
	if (!list_is_first(&tsp->asoc->asocs, &ep->asocs))
		return 0;

	if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
		return 0;

	return 1;
}

static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
{
	struct sctp_comm_param *commp = p;
	struct sock *sk = ep->base.sk;
	struct sk_buff *skb = commp->skb;
	struct netlink_callback *cb = commp->cb;
	const struct inet_diag_req_v2 *r = commp->r;
	struct net *net = sock_net(skb->sk);
	struct inet_sock *inet = inet_sk(sk);
	int err = 0;

	if (!net_eq(sock_net(sk), net))
		goto out;

	if (cb->args[4] < cb->args[1])
		goto next;

	if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
		goto next;

	if (r->sdiag_family != AF_UNSPEC &&
	    sk->sk_family != r->sdiag_family)
		goto next;

	if (r->id.idiag_sport != inet->inet_sport &&
	    r->id.idiag_sport)
		goto next;

	if (r->id.idiag_dport != inet->inet_dport &&
	    r->id.idiag_dport)
		goto next;

	if (inet_sctp_diag_fill(sk, NULL, skb, r,
				sk_user_ns(NETLINK_CB(cb->skb).sk),
				NETLINK_CB(cb->skb).portid,
				cb->nlh->nlmsg_seq, NLM_F_MULTI,
				cb->nlh, commp->net_admin) < 0) {
		err = 2;
		goto out;
	}
next:
	cb->args[4]++;
out:
	return err;
}

/* define the functions for sctp_diag_handler*/
static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
			       void *info)
{
	struct sctp_infox *infox = (struct sctp_infox *)info;

	if (infox->asoc) {
		r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
		r->idiag_wqueue = infox->asoc->sndbuf_used;
	} else {
		r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog);
		r->idiag_wqueue = READ_ONCE(sk->sk_max_ack_backlog);
	}
	if (infox->sctpinfo)
		sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
}

static int sctp_diag_dump_one(struct netlink_callback *cb,
			      const struct inet_diag_req_v2 *req)
{
	struct sk_buff *skb = cb->skb;
	struct net *net = sock_net(skb->sk);
	const struct nlmsghdr *nlh = cb->nlh;
	union sctp_addr laddr, paddr;
	int dif = req->id.idiag_if;
	struct sctp_comm_param commp = {
		.skb = skb,
		.r = req,
		.nlh = nlh,
		.net_admin = netlink_net_capable(skb, CAP_NET_ADMIN),
	};

	if (req->sdiag_family == AF_INET) {
		laddr.v4.sin_port = req->id.idiag_sport;
		laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
		laddr.v4.sin_family = AF_INET;

		paddr.v4.sin_port = req->id.idiag_dport;
		paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
		paddr.v4.sin_family = AF_INET;
	} else {
		laddr.v6.sin6_port = req->id.idiag_sport;
		memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
		       sizeof(laddr.v6.sin6_addr));
		laddr.v6.sin6_family = AF_INET6;

		paddr.v6.sin6_port = req->id.idiag_dport;
		memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
		       sizeof(paddr.v6.sin6_addr));
		paddr.v6.sin6_family = AF_INET6;
	}

	return sctp_transport_lookup_process(sctp_sock_dump_one,
					     net, &laddr, &paddr, &commp, dif);
}

static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
			   const struct inet_diag_req_v2 *r)
{
	u32 idiag_states = r->idiag_states;
	struct net *net = sock_net(skb->sk);
	struct sctp_comm_param commp = {
		.skb = skb,
		.cb = cb,
		.r = r,
		.net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
	};
	int pos = cb->args[2];

	/* eps hashtable dumps
	 * args:
	 * 0 : if it will traversal listen sock
	 * 1 : to record the sock pos of this time's traversal
	 * 4 : to work as a temporary variable to traversal list
	 */
	if (cb->args[0] == 0) {
		if (!(idiag_states & TCPF_LISTEN))
			goto skip;
		if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
			goto done;
skip:
		cb->args[0] = 1;
		cb->args[1] = 0;
		cb->args[4] = 0;
	}

	/* asocs by transport hashtable dump
	 * args:
	 * 1 : to record the assoc pos of this time's traversal
	 * 2 : to record the transport pos of this time's traversal
	 * 3 : to mark if we have dumped the ep info of the current asoc
	 * 4 : to work as a temporary variable to traversal list
	 * 5 : to save the sk we get from travelsing the tsp list.
	 */
	if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
		goto done;

	sctp_transport_traverse_process(sctp_sock_filter, sctp_sock_dump,
					net, &pos, &commp);
	cb->args[2] = pos;

done:
	cb->args[1] = cb->args[4];
	cb->args[4] = 0;
}

static const struct inet_diag_handler sctp_diag_handler = {
	.owner		 = THIS_MODULE,
	.dump		 = sctp_diag_dump,
	.dump_one	 = sctp_diag_dump_one,
	.idiag_get_info  = sctp_diag_get_info,
	.idiag_type	 = IPPROTO_SCTP,
	.idiag_info_size = sizeof(struct sctp_info),
};

static int __init sctp_diag_init(void)
{
	return inet_diag_register(&sctp_diag_handler);
}

static void __exit sctp_diag_exit(void)
{
	inet_diag_unregister(&sctp_diag_handler);
}

module_init(sctp_diag_init);
module_exit(sctp_diag_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SCTP socket monitoring via SOCK_DIAG");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);
Commit	Line	Data
47505b8b	1	// SPDX-License-Identifier: GPL-2.0-or-later
6f68dc99 XL	2	/* SCTP kernel implementation
	3	* (C) Copyright Red Hat Inc. 2017
	4	*
	5	* This file is part of the SCTP kernel implementation
	6	*
	7	* These functions implement sctp diag support.
	8	*
6f68dc99 XL	9	* Please send any bug reports or fixes you make to the
	10	* email addresched(es):
	11	* lksctp developers <linux-sctp@vger.kernel.org>
	12	*
	13	* Written or modified by:
	14	* Xin Long <lucien.xin@gmail.com>
	15	*/
	16
8f840e47 XL	17	#include <linux/module.h>
	18	#include <linux/inet_diag.h>
	19	#include <linux/sock_diag.h>
	20	#include <net/sctp/sctp.h>
	21
8f840e47 XL	22	static void sctp_diag_get_info(struct sock sk, struct inet_diag_msg r,
	23	void *info);
	24
	25	/* define some functions to make asoc/ep fill look clean */
	26	static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
	27	struct sock *sk,
	28	struct sctp_association *asoc)
	29	{
	30	union sctp_addr laddr, paddr;
	31	struct dst_entry *dst;
12474e8e	32	struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer;
8f840e47 XL	33
	34	laddr = list_entry(asoc->base.bind_addr.address_list.next,
	35	struct sctp_sockaddr_entry, list)->a;
	36	paddr = asoc->peer.primary_path->ipaddr;
	37	dst = asoc->peer.primary_path->dst;
	38
	39	r->idiag_family = sk->sk_family;
	40	r->id.idiag_sport = htons(asoc->base.bind_addr.port);
	41	r->id.idiag_dport = htons(asoc->peer.port);
	42	r->id.idiag_if = dst ? dst->dev->ifindex : 0;
	43	sock_diag_save_cookie(sk, r->id.idiag_cookie);
	44
	45	#if IS_ENABLED(CONFIG_IPV6)
	46	if (sk->sk_family == AF_INET6) {
	47	(struct in6_addr )r->id.idiag_src = laddr.v6.sin6_addr;
	48	(struct in6_addr )r->id.idiag_dst = paddr.v6.sin6_addr;
	49	} else
	50	#endif
	51	{
	52	memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
	53	memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
	54
	55	r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
	56	r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
	57	}
	58
	59	r->idiag_state = asoc->state;
12474e8e PS	60	if (timer_pending(t3_rtx)) {
	61	r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
	62	r->idiag_retrans = asoc->rtx_data_chunks;
	63	r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies);
12474e8e	64	}
8f840e47 XL	65	}
	66
	67	static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
	68	struct list_head *address_list)
	69	{
	70	struct sctp_sockaddr_entry *laddr;
	71	int addrlen = sizeof(struct sockaddr_storage);
	72	int addrcnt = 0;
	73	struct nlattr *attr;
	74	void *info = NULL;
	75
	76	list_for_each_entry_rcu(laddr, address_list, list)
	77	addrcnt++;
	78
	79	attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
	80	if (!attr)
	81	return -EMSGSIZE;
	82
	83	info = nla_data(attr);
	84	list_for_each_entry_rcu(laddr, address_list, list) {
ee6c88bb SB	85	memcpy(info, &laddr->a, sizeof(laddr->a));
ee6c88bb SB	86	memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a));
8f840e47 XL	87	info += addrlen;
	88	}
	89
	90	return 0;
	91	}
	92
	93	static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
	94	struct sctp_association *asoc)
	95	{
	96	int addrlen = sizeof(struct sockaddr_storage);
	97	struct sctp_transport *from;
	98	struct nlattr *attr;
	99	void *info = NULL;
	100
	101	attr = nla_reserve(skb, INET_DIAG_PEERS,
	102	addrlen * asoc->peer.transport_count);
	103	if (!attr)
	104	return -EMSGSIZE;
	105
	106	info = nla_data(attr);
	107	list_for_each_entry(from, &asoc->peer.transport_addr_list,
	108	transports) {
ee6c88bb SB	109	memcpy(info, &from->ipaddr, sizeof(from->ipaddr));
	110	memset(info + sizeof(from->ipaddr), 0,
	111	addrlen - sizeof(from->ipaddr));
8f840e47 XL	112	info += addrlen;
	113	}
	114
	115	return 0;
	116	}
	117
	118	/* sctp asoc/ep fill*/
	119	static int inet_sctp_diag_fill(struct sock sk, struct sctp_association asoc,
	120	struct sk_buff *skb,
	121	const struct inet_diag_req_v2 *req,
	122	struct user_namespace *user_ns,
	123	int portid, u32 seq, u16 nlmsg_flags,
d545caca LC	124	const struct nlmsghdr *unlh,
d545caca LC	125	bool net_admin)
8f840e47 XL	126	{
	127	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
	128	struct list_head *addr_list;
	129	struct inet_diag_msg *r;
	130	struct nlmsghdr *nlh;
	131	int ext = req->idiag_ext;
	132	struct sctp_infox infox;
	133	void *info = NULL;
	134
	135	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
	136	nlmsg_flags);
	137	if (!nlh)
	138	return -EMSGSIZE;
	139
	140	r = nlmsg_data(nlh);
	141	BUG_ON(!sk_fullsock(sk));
	142
633593a8 ED	143	r->idiag_timer = 0;
	144	r->idiag_retrans = 0;
	145	r->idiag_expires = 0;
8f840e47 XL	146	if (asoc) {
	147	inet_diag_msg_sctpasoc_fill(r, sk, asoc);
	148	} else {
	149	inet_diag_msg_common_fill(r, sk);
	150	r->idiag_state = sk->sk_state;
8f840e47 XL	151	}
8f840e47 XL	152
d545caca	153	if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
8f840e47 XL	154	goto errout;
	155
	156	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
	157	u32 mem[SK_MEMINFO_VARS];
	158	int amt;
	159
	160	if (asoc && asoc->ep->sndbuf_policy)
	161	amt = asoc->sndbuf_used;
	162	else
	163	amt = sk_wmem_alloc_get(sk);
	164	mem[SK_MEMINFO_WMEM_ALLOC] = amt;
f052f20a XL	165	if (asoc && asoc->ep->rcvbuf_policy)
	166	amt = atomic_read(&asoc->rmem_alloc);
	167	else
	168	amt = sk_rmem_alloc_get(sk);
	169	mem[SK_MEMINFO_RMEM_ALLOC] = amt;
8f840e47 XL	170	mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
	171	mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
	172	mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
	173	mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
	174	mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
70c26558	175	mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
8f840e47 XL	176	mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
	177
	178	if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
	179	goto errout;
	180	}
	181
	182	if (ext & (1 << (INET_DIAG_INFO - 1))) {
	183	struct nlattr *attr;
	184
6ed46d12 ND	185	attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
	186	sizeof(struct sctp_info),
	187	INET_DIAG_PAD);
8f840e47 XL	188	if (!attr)
	189	goto errout;
	190
	191	info = nla_data(attr);
	192	}
	193	infox.sctpinfo = (struct sctp_info *)info;
	194	infox.asoc = asoc;
	195	sctp_diag_get_info(sk, r, &infox);
	196
	197	addr_list = asoc ? &asoc->base.bind_addr.address_list
	198	: &ep->base.bind_addr.address_list;
	199	if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
	200	goto errout;
	201
	202	if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
	203	if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
	204	goto errout;
	205
	206	if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
	207	goto errout;
	208
	209	nlmsg_end(skb, nlh);
	210	return 0;
	211
	212	errout:
	213	nlmsg_cancel(skb, nlh);
	214	return -EMSGSIZE;
	215	}
	216
	217	/* callback and param */
	218	struct sctp_comm_param {
	219	struct sk_buff *skb;
	220	struct netlink_callback *cb;
	221	const struct inet_diag_req_v2 *r;
	222	const struct nlmsghdr *nlh;
d545caca	223	bool net_admin;
8f840e47 XL	224	};
	225
	226	static size_t inet_assoc_attr_size(struct sctp_association *asoc)
	227	{
	228	int addrlen = sizeof(struct sockaddr_storage);
	229	int addrcnt = 0;
	230	struct sctp_sockaddr_entry *laddr;
	231
	232	list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
	233	list)
	234	addrcnt++;
	235
	236	return nla_total_size(sizeof(struct sctp_info))
8f840e47 XL	237	+ nla_total_size(addrlen * asoc->peer.transport_count)
8f840e47 XL	238	+ nla_total_size(addrlen * addrcnt)
8f840e47	239	+ nla_total_size(sizeof(struct inet_diag_msg))
83f73c5b DY	240	+ inet_diag_msg_attrs_size()
83f73c5b DY	241	+ nla_total_size(sizeof(struct inet_diag_meminfo))
8f840e47 XL	242	+ 64;
	243	}
	244
f9d31c4c	245	static int sctp_sock_dump_one(struct sctp_endpoint ep, struct sctp_transport tsp, void *p)
8f840e47 XL	246	{
8f840e47 XL	247	struct sctp_association *assoc = tsp->asoc;
8f840e47	248	struct sctp_comm_param *commp = p;
f9d31c4c	249	struct sock *sk = ep->base.sk;
8f840e47	250	const struct inet_diag_req_v2 *req = commp->r;
f9d31c4c	251	struct sk_buff *skb = commp->skb;
8f840e47 XL	252	struct sk_buff *rep;
	253	int err;
	254
	255	err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
	256	if (err)
f9d31c4c	257	return err;
8f840e47	258
8f840e47 XL	259	rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
8f840e47 XL	260	if (!rep)
f9d31c4c	261	return -ENOMEM;
8f840e47 XL	262
8f840e47 XL	263	lock_sock(sk);
f9d31c4c XL	264	if (ep != assoc->ep) {
	265	err = -EAGAIN;
	266	goto out;
8f840e47	267	}
f9d31c4c XL	268
	269	err = inet_sctp_diag_fill(sk, assoc, rep, req, sk_user_ns(NETLINK_CB(skb).sk),
	270	NETLINK_CB(skb).portid, commp->nlh->nlmsg_seq, 0,
	271	commp->nlh, commp->net_admin);
8f840e47 XL	272	if (err < 0) {
8f840e47 XL	273	WARN_ON(err == -EMSGSIZE);
8f840e47 XL	274	goto out;
8f840e47 XL	275	}
f9d31c4c	276	release_sock(sk);
8f840e47	277
f9d31c4c	278	return nlmsg_unicast(sock_net(skb->sk)->diag_nlsk, rep, NETLINK_CB(skb).portid);
01757f53	279
8f840e47	280	out:
f9d31c4c XL	281	release_sock(sk);
f9d31c4c XL	282	kfree_skb(rep);
8f840e47 XL	283	return err;
	284	}
	285
5ec7d18d	286	static int sctp_sock_dump(struct sctp_endpoint ep, struct sctp_transport tsp, void *p)
8f840e47	287	{
8f840e47	288	struct sctp_comm_param *commp = p;
d25adbeb	289	struct sock *sk = ep->base.sk;
8f840e47 XL	290	struct sk_buff *skb = commp->skb;
	291	struct netlink_callback *cb = commp->cb;
	292	const struct inet_diag_req_v2 *r = commp->r;
1cceda78	293	struct sctp_association *assoc;
8f840e47 XL	294	int err = 0;
8f840e47 XL	295
8f840e47	296	lock_sock(sk);
5ec7d18d XL	297	if (ep != tsp->asoc->ep)
5ec7d18d XL	298	goto release;
d25adbeb	299	list_for_each_entry(assoc, &ep->asocs, asocs) {
8f840e47 XL	300	if (cb->args[4] < cb->args[1])
	301	goto next;
	302
	303	if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
	304	r->id.idiag_sport)
	305	goto next;
	306	if (r->id.idiag_dport != htons(assoc->peer.port) &&
	307	r->id.idiag_dport)
	308	goto next;
	309
	310	if (!cb->args[3] &&
	311	inet_sctp_diag_fill(sk, NULL, skb, r,
	312	sk_user_ns(NETLINK_CB(cb->skb).sk),
	313	NETLINK_CB(cb->skb).portid,
	314	cb->nlh->nlmsg_seq,
d545caca LC	315	NLM_F_MULTI, cb->nlh,
d545caca LC	316	commp->net_admin) < 0) {
1cceda78	317	err = 1;
8f840e47 XL	318	goto release;
	319	}
	320	cb->args[3] = 1;
	321
	322	if (inet_sctp_diag_fill(sk, assoc, skb, r,
	323	sk_user_ns(NETLINK_CB(cb->skb).sk),
	324	NETLINK_CB(cb->skb).portid,
d545caca LC	325	cb->nlh->nlmsg_seq, 0, cb->nlh,
d545caca LC	326	commp->net_admin) < 0) {
1cceda78	327	err = 1;
8f840e47 XL	328	goto release;
	329	}
	330	next:
	331	cb->args[4]++;
	332	}
	333	cb->args[1] = 0;
8f840e47 XL	334	cb->args[3] = 0;
	335	cb->args[4] = 0;
	336	release:
	337	release_sock(sk);
	338	return err;
1cceda78 XL	339	}
1cceda78 XL	340
5ec7d18d	341	static int sctp_sock_filter(struct sctp_endpoint ep, struct sctp_transport tsp, void *p)
1cceda78	342	{
1cceda78 XL	343	struct sctp_comm_param *commp = p;
1cceda78 XL	344	struct sock *sk = ep->base.sk;
1cceda78	345	const struct inet_diag_req_v2 *r = commp->r;
1cceda78 XL	346
1cceda78 XL	347	/* find the ep only once through the transports by this condition */
a1221703	348	if (!list_is_first(&tsp->asoc->asocs, &ep->asocs))
d25adbeb	349	return 0;
1cceda78 XL	350
1cceda78 XL	351	if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
d25adbeb	352	return 0;
1cceda78 XL	353
1cceda78 XL	354	return 1;
8f840e47 XL	355	}
	356
	357	static int sctp_ep_dump(struct sctp_endpoint ep, void p)
	358	{
	359	struct sctp_comm_param *commp = p;
	360	struct sock *sk = ep->base.sk;
	361	struct sk_buff *skb = commp->skb;
	362	struct netlink_callback *cb = commp->cb;
	363	const struct inet_diag_req_v2 *r = commp->r;
	364	struct net *net = sock_net(skb->sk);
	365	struct inet_sock *inet = inet_sk(sk);
	366	int err = 0;
	367
	368	if (!net_eq(sock_net(sk), net))
	369	goto out;
	370
	371	if (cb->args[4] < cb->args[1])
	372	goto next;
	373
1ba8d77f	374	if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
bed187b5 XL	375	goto next;
bed187b5 XL	376
8f840e47 XL	377	if (r->sdiag_family != AF_UNSPEC &&
	378	sk->sk_family != r->sdiag_family)
	379	goto next;
	380
	381	if (r->id.idiag_sport != inet->inet_sport &&
	382	r->id.idiag_sport)
	383	goto next;
	384
	385	if (r->id.idiag_dport != inet->inet_dport &&
	386	r->id.idiag_dport)
	387	goto next;
	388
	389	if (inet_sctp_diag_fill(sk, NULL, skb, r,
	390	sk_user_ns(NETLINK_CB(cb->skb).sk),
	391	NETLINK_CB(cb->skb).portid,
	392	cb->nlh->nlmsg_seq, NLM_F_MULTI,
d545caca	393	cb->nlh, commp->net_admin) < 0) {
8f840e47 XL	394	err = 2;
	395	goto out;
	396	}
	397	next:
	398	cb->args[4]++;
	399	out:
	400	return err;
	401	}
	402
	403	/* define the functions for sctp_diag_handler*/
	404	static void sctp_diag_get_info(struct sock sk, struct inet_diag_msg r,
	405	void *info)
	406	{
	407	struct sctp_infox infox = (struct sctp_infox )info;
	408
	409	if (infox->asoc) {
	410	r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
	411	r->idiag_wqueue = infox->asoc->sndbuf_used;
	412	} else {
288efe86	413	r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog);
099ecf59	414	r->idiag_wqueue = READ_ONCE(sk->sk_max_ack_backlog);
8f840e47 XL	415	}
	416	if (infox->sctpinfo)
	417	sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
	418	}
	419
5682d393	420	static int sctp_diag_dump_one(struct netlink_callback *cb,
8f840e47 XL	421	const struct inet_diag_req_v2 *req)
8f840e47 XL	422	{
f9d31c4c XL	423	struct sk_buff *skb = cb->skb;
f9d31c4c XL	424	struct net *net = sock_net(skb->sk);
5682d393	425	const struct nlmsghdr *nlh = cb->nlh;
8f840e47	426	union sctp_addr laddr, paddr;
0af03170	427	int dif = req->id.idiag_if;
8f840e47	428	struct sctp_comm_param commp = {
f9d31c4c	429	.skb = skb,
8f840e47 XL	430	.r = req,
8f840e47 XL	431	.nlh = nlh,
f9d31c4c	432	.net_admin = netlink_net_capable(skb, CAP_NET_ADMIN),
8f840e47 XL	433	};
	434
	435	if (req->sdiag_family == AF_INET) {
	436	laddr.v4.sin_port = req->id.idiag_sport;
	437	laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
	438	laddr.v4.sin_family = AF_INET;
	439
	440	paddr.v4.sin_port = req->id.idiag_dport;
	441	paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
	442	paddr.v4.sin_family = AF_INET;
	443	} else {
	444	laddr.v6.sin6_port = req->id.idiag_sport;
232cb53a LR	445	memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
232cb53a LR	446	sizeof(laddr.v6.sin6_addr));
8f840e47 XL	447	laddr.v6.sin6_family = AF_INET6;
	448
	449	paddr.v6.sin6_port = req->id.idiag_dport;
232cb53a LR	450	memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
232cb53a LR	451	sizeof(paddr.v6.sin6_addr));
8f840e47 XL	452	paddr.v6.sin6_family = AF_INET6;
	453	}
	454
f9d31c4c	455	return sctp_transport_lookup_process(sctp_sock_dump_one,
0af03170	456	net, &laddr, &paddr, &commp, dif);
8f840e47 XL	457	}
	458
	459	static void sctp_diag_dump(struct sk_buff skb, struct netlink_callback cb,
0df6d328	460	const struct inet_diag_req_v2 *r)
8f840e47 XL	461	{
	462	u32 idiag_states = r->idiag_states;
	463	struct net *net = sock_net(skb->sk);
	464	struct sctp_comm_param commp = {
	465	.skb = skb,
	466	.cb = cb,
	467	.r = r,
d545caca	468	.net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
8f840e47	469	};
c2cc187e	470	int pos = cb->args[2];
8f840e47 XL	471
	472	/* eps hashtable dumps
	473	* args:
	474	* 0 : if it will traversal listen sock
	475	* 1 : to record the sock pos of this time's traversal
	476	* 4 : to work as a temporary variable to traversal list
	477	*/
	478	if (cb->args[0] == 0) {
	479	if (!(idiag_states & TCPF_LISTEN))
	480	goto skip;
	481	if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
	482	goto done;
	483	skip:
	484	cb->args[0] = 1;
	485	cb->args[1] = 0;
	486	cb->args[4] = 0;
	487	}
	488
	489	/* asocs by transport hashtable dump
	490	* args:
	491	* 1 : to record the assoc pos of this time's traversal
	492	* 2 : to record the transport pos of this time's traversal
	493	* 3 : to mark if we have dumped the ep info of the current asoc
	494	* 4 : to work as a temporary variable to traversal list
1cceda78	495	* 5 : to save the sk we get from travelsing the tsp list.
8f840e47	496	*/
1ba8d77f	497	if (!(idiag_states & ~(TCPF_LISTEN \| TCPF_CLOSE)))
8f840e47	498	goto done;
1cceda78	499
5ec7d18d XL	500	sctp_transport_traverse_process(sctp_sock_filter, sctp_sock_dump,
5ec7d18d XL	501	net, &pos, &commp);
c2cc187e	502	cb->args[2] = pos;
1cceda78	503
8f840e47 XL	504	done:
	505	cb->args[1] = cb->args[4];
	506	cb->args[4] = 0;
	507	}
	508
	509	static const struct inet_diag_handler sctp_diag_handler = {
db591469	510	.owner = THIS_MODULE,
8f840e47 XL	511	.dump = sctp_diag_dump,
	512	.dump_one = sctp_diag_dump_one,
	513	.idiag_get_info = sctp_diag_get_info,
	514	.idiag_type = IPPROTO_SCTP,
	515	.idiag_info_size = sizeof(struct sctp_info),
	516	};
	517
	518	static int __init sctp_diag_init(void)
	519	{
	520	return inet_diag_register(&sctp_diag_handler);
	521	}
	522
	523	static void __exit sctp_diag_exit(void)
	524	{
	525	inet_diag_unregister(&sctp_diag_handler);
	526	}
	527
	528	module_init(sctp_diag_init);
	529	module_exit(sctp_diag_exit);
	530	MODULE_LICENSE("GPL");
938dbead	531	MODULE_DESCRIPTION("SCTP socket monitoring via SOCK_DIAG");
8f840e47	532	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);