[mirror_ubuntu-artful-kernel.git] / net / sctp / sctp_diag.c

#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);
	} else {
		r->idiag_timer = 0;
		r->idiag_retrans = 0;
		r->idiag_expires = 0;
	}
}

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));

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

	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] = 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(1) /* INET_DIAG_SHUTDOWN */
		+ nla_total_size(1) /* INET_DIAG_TOS */
		+ nla_total_size(1) /* INET_DIAG_TCLASS */
		+ nla_total_size(4) /* INET_DIAG_MARK */
		+ nla_total_size(addrlen * asoc->peer.transport_count)
		+ nla_total_size(addrlen * addrcnt)
		+ nla_total_size(sizeof(struct inet_diag_meminfo))
		+ nla_total_size(sizeof(struct inet_diag_msg))
		+ 64;
}

static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
{
	struct sctp_association *assoc = tsp->asoc;
	struct sock *sk = tsp->asoc->base.sk;
	struct sctp_comm_param *commp = p;
	struct sk_buff *in_skb = commp->skb;
	const struct inet_diag_req_v2 *req = commp->r;
	const struct nlmsghdr *nlh = commp->nlh;
	struct net *net = sock_net(in_skb->sk);
	struct sk_buff *rep;
	int err;

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

	err = -ENOMEM;
	rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
	if (!rep)
		goto out;

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

	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
			      MSG_DONTWAIT);
	if (err > 0)
		err = 0;
out:
	return err;
}

static int sctp_sock_dump(struct sock *sk, void *p)
{
	struct sctp_comm_param *commp = p;
	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 (!sctp_sk(sk)->ep)
		goto release;
	list_for_each_entry(assoc, &sctp_sk(sk)->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) {
			cb->args[3] = 1;
			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[2]++;
	cb->args[3] = 0;
	cb->args[4] = 0;
release:
	release_sock(sk);
	sock_put(sk);
	return err;
}

static int sctp_get_sock(struct sctp_transport *tsp, void *p)
{
	struct sctp_endpoint *ep = tsp->asoc->ep;
	struct sctp_comm_param *commp = p;
	struct sock *sk = ep->base.sk;
	struct netlink_callback *cb = commp->cb;
	const struct inet_diag_req_v2 *r = commp->r;
	struct sctp_association *assoc =
		list_entry(ep->asocs.next, struct sctp_association, asocs);

	/* find the ep only once through the transports by this condition */
	if (tsp->asoc != assoc)
		goto out;

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

	sock_hold(sk);
	cb->args[5] = (long)sk;

	return 1;

out:
	cb->args[2]++;
	return 0;
}

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 = sk->sk_ack_backlog;
		r->idiag_wqueue = sk->sk_max_ack_backlog;
	}
	if (infox->sctpinfo)
		sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
}

static int sctp_diag_dump_one(struct sk_buff *in_skb,
			      const struct nlmsghdr *nlh,
			      const struct inet_diag_req_v2 *req)
{
	struct net *net = sock_net(in_skb->sk);
	union sctp_addr laddr, paddr;
	struct sctp_comm_param commp = {
		.skb = in_skb,
		.r = req,
		.nlh = nlh,
		.net_admin = netlink_net_capable(in_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_tsp_dump_one,
					     net, &laddr, &paddr, &commp);
}

static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
			   const struct inet_diag_req_v2 *r, struct nlattr *bc)
{
	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),
	};

	/* 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;

next:
	cb->args[5] = 0;
	sctp_for_each_transport(sctp_get_sock, net, cb->args[2], &commp);

	if (cb->args[5] && !sctp_sock_dump((struct sock *)cb->args[5], &commp))
		goto next;

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

static const struct inet_diag_handler sctp_diag_handler = {
	.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_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);
Commit	Line	Data
8f840e47 XL	1	#include <linux/module.h>
	2	#include <linux/inet_diag.h>
	3	#include <linux/sock_diag.h>
	4	#include <net/sctp/sctp.h>
	5
8f840e47 XL	6	static void sctp_diag_get_info(struct sock sk, struct inet_diag_msg r,
	7	void *info);
	8
	9	/* define some functions to make asoc/ep fill look clean */
	10	static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
	11	struct sock *sk,
	12	struct sctp_association *asoc)
	13	{
	14	union sctp_addr laddr, paddr;
	15	struct dst_entry *dst;
12474e8e	16	struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer;
8f840e47 XL	17
	18	laddr = list_entry(asoc->base.bind_addr.address_list.next,
	19	struct sctp_sockaddr_entry, list)->a;
	20	paddr = asoc->peer.primary_path->ipaddr;
	21	dst = asoc->peer.primary_path->dst;
	22
	23	r->idiag_family = sk->sk_family;
	24	r->id.idiag_sport = htons(asoc->base.bind_addr.port);
	25	r->id.idiag_dport = htons(asoc->peer.port);
	26	r->id.idiag_if = dst ? dst->dev->ifindex : 0;
	27	sock_diag_save_cookie(sk, r->id.idiag_cookie);
	28
	29	#if IS_ENABLED(CONFIG_IPV6)
	30	if (sk->sk_family == AF_INET6) {
	31	(struct in6_addr )r->id.idiag_src = laddr.v6.sin6_addr;
	32	(struct in6_addr )r->id.idiag_dst = paddr.v6.sin6_addr;
	33	} else
	34	#endif
	35	{
	36	memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
	37	memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
	38
	39	r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
	40	r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
	41	}
	42
	43	r->idiag_state = asoc->state;
12474e8e PS	44	if (timer_pending(t3_rtx)) {
	45	r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
	46	r->idiag_retrans = asoc->rtx_data_chunks;
	47	r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies);
	48	} else {
	49	r->idiag_timer = 0;
	50	r->idiag_retrans = 0;
	51	r->idiag_expires = 0;
	52	}
8f840e47 XL	53	}
	54
	55	static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
	56	struct list_head *address_list)
	57	{
	58	struct sctp_sockaddr_entry *laddr;
	59	int addrlen = sizeof(struct sockaddr_storage);
	60	int addrcnt = 0;
	61	struct nlattr *attr;
	62	void *info = NULL;
	63
	64	list_for_each_entry_rcu(laddr, address_list, list)
	65	addrcnt++;
	66
	67	attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
	68	if (!attr)
	69	return -EMSGSIZE;
	70
	71	info = nla_data(attr);
	72	list_for_each_entry_rcu(laddr, address_list, list) {
ee6c88bb SB	73	memcpy(info, &laddr->a, sizeof(laddr->a));
ee6c88bb SB	74	memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a));
8f840e47 XL	75	info += addrlen;
	76	}
	77
	78	return 0;
	79	}
	80
	81	static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
	82	struct sctp_association *asoc)
	83	{
	84	int addrlen = sizeof(struct sockaddr_storage);
	85	struct sctp_transport *from;
	86	struct nlattr *attr;
	87	void *info = NULL;
	88
	89	attr = nla_reserve(skb, INET_DIAG_PEERS,
	90	addrlen * asoc->peer.transport_count);
	91	if (!attr)
	92	return -EMSGSIZE;
	93
	94	info = nla_data(attr);
	95	list_for_each_entry(from, &asoc->peer.transport_addr_list,
	96	transports) {
ee6c88bb SB	97	memcpy(info, &from->ipaddr, sizeof(from->ipaddr));
	98	memset(info + sizeof(from->ipaddr), 0,
	99	addrlen - sizeof(from->ipaddr));
8f840e47 XL	100	info += addrlen;
	101	}
	102
	103	return 0;
	104	}
	105
	106	/* sctp asoc/ep fill*/
	107	static int inet_sctp_diag_fill(struct sock sk, struct sctp_association asoc,
	108	struct sk_buff *skb,
	109	const struct inet_diag_req_v2 *req,
	110	struct user_namespace *user_ns,
	111	int portid, u32 seq, u16 nlmsg_flags,
d545caca LC	112	const struct nlmsghdr *unlh,
d545caca LC	113	bool net_admin)
8f840e47 XL	114	{
	115	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
	116	struct list_head *addr_list;
	117	struct inet_diag_msg *r;
	118	struct nlmsghdr *nlh;
	119	int ext = req->idiag_ext;
	120	struct sctp_infox infox;
	121	void *info = NULL;
	122
	123	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
	124	nlmsg_flags);
	125	if (!nlh)
	126	return -EMSGSIZE;
	127
	128	r = nlmsg_data(nlh);
	129	BUG_ON(!sk_fullsock(sk));
	130
	131	if (asoc) {
	132	inet_diag_msg_sctpasoc_fill(r, sk, asoc);
	133	} else {
	134	inet_diag_msg_common_fill(r, sk);
	135	r->idiag_state = sk->sk_state;
	136	r->idiag_timer = 0;
	137	r->idiag_retrans = 0;
	138	}
	139
d545caca	140	if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
8f840e47 XL	141	goto errout;
	142
	143	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
	144	u32 mem[SK_MEMINFO_VARS];
	145	int amt;
	146
	147	if (asoc && asoc->ep->sndbuf_policy)
	148	amt = asoc->sndbuf_used;
	149	else
	150	amt = sk_wmem_alloc_get(sk);
	151	mem[SK_MEMINFO_WMEM_ALLOC] = amt;
f052f20a XL	152	if (asoc && asoc->ep->rcvbuf_policy)
	153	amt = atomic_read(&asoc->rmem_alloc);
	154	else
	155	amt = sk_rmem_alloc_get(sk);
	156	mem[SK_MEMINFO_RMEM_ALLOC] = amt;
8f840e47 XL	157	mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
	158	mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
	159	mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
	160	mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
	161	mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
	162	mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
	163	mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
	164
	165	if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
	166	goto errout;
	167	}
	168
	169	if (ext & (1 << (INET_DIAG_INFO - 1))) {
	170	struct nlattr *attr;
	171
6ed46d12 ND	172	attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
	173	sizeof(struct sctp_info),
	174	INET_DIAG_PAD);
8f840e47 XL	175	if (!attr)
	176	goto errout;
	177
	178	info = nla_data(attr);
	179	}
	180	infox.sctpinfo = (struct sctp_info *)info;
	181	infox.asoc = asoc;
	182	sctp_diag_get_info(sk, r, &infox);
	183
	184	addr_list = asoc ? &asoc->base.bind_addr.address_list
	185	: &ep->base.bind_addr.address_list;
	186	if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
	187	goto errout;
	188
	189	if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
	190	if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
	191	goto errout;
	192
	193	if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
	194	goto errout;
	195
	196	nlmsg_end(skb, nlh);
	197	return 0;
	198
	199	errout:
	200	nlmsg_cancel(skb, nlh);
	201	return -EMSGSIZE;
	202	}
	203
	204	/* callback and param */
	205	struct sctp_comm_param {
	206	struct sk_buff *skb;
	207	struct netlink_callback *cb;
	208	const struct inet_diag_req_v2 *r;
	209	const struct nlmsghdr *nlh;
d545caca	210	bool net_admin;
8f840e47 XL	211	};
	212
	213	static size_t inet_assoc_attr_size(struct sctp_association *asoc)
	214	{
	215	int addrlen = sizeof(struct sockaddr_storage);
	216	int addrcnt = 0;
	217	struct sctp_sockaddr_entry *laddr;
	218
	219	list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
	220	list)
	221	addrcnt++;
	222
	223	return nla_total_size(sizeof(struct sctp_info))
	224	+ nla_total_size(1) /* INET_DIAG_SHUTDOWN */
	225	+ nla_total_size(1) /* INET_DIAG_TOS */
	226	+ nla_total_size(1) /* INET_DIAG_TCLASS */
d545caca	227	+ nla_total_size(4) /* INET_DIAG_MARK */
8f840e47 XL	228	+ nla_total_size(addrlen * asoc->peer.transport_count)
	229	+ nla_total_size(addrlen * addrcnt)
	230	+ nla_total_size(sizeof(struct inet_diag_meminfo))
	231	+ nla_total_size(sizeof(struct inet_diag_msg))
	232	+ 64;
	233	}
	234
	235	static int sctp_tsp_dump_one(struct sctp_transport tsp, void p)
	236	{
	237	struct sctp_association *assoc = tsp->asoc;
	238	struct sock *sk = tsp->asoc->base.sk;
	239	struct sctp_comm_param *commp = p;
	240	struct sk_buff *in_skb = commp->skb;
	241	const struct inet_diag_req_v2 *req = commp->r;
	242	const struct nlmsghdr *nlh = commp->nlh;
	243	struct net *net = sock_net(in_skb->sk);
	244	struct sk_buff *rep;
	245	int err;
	246
	247	err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
	248	if (err)
	249	goto out;
	250
	251	err = -ENOMEM;
	252	rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
	253	if (!rep)
	254	goto out;
	255
	256	lock_sock(sk);
	257	if (sk != assoc->base.sk) {
	258	release_sock(sk);
	259	sk = assoc->base.sk;
	260	lock_sock(sk);
	261	}
	262	err = inet_sctp_diag_fill(sk, assoc, rep, req,
	263	sk_user_ns(NETLINK_CB(in_skb).sk),
	264	NETLINK_CB(in_skb).portid,
d545caca LC	265	nlh->nlmsg_seq, 0, nlh,
d545caca LC	266	commp->net_admin);
8f840e47 XL	267	release_sock(sk);
	268	if (err < 0) {
	269	WARN_ON(err == -EMSGSIZE);
	270	kfree_skb(rep);
	271	goto out;
	272	}
	273
	274	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
	275	MSG_DONTWAIT);
	276	if (err > 0)
	277	err = 0;
	278	out:
	279	return err;
	280	}
	281
1cceda78	282	static int sctp_sock_dump(struct sock sk, void p)
8f840e47	283	{
8f840e47	284	struct sctp_comm_param *commp = p;
8f840e47 XL	285	struct sk_buff *skb = commp->skb;
	286	struct netlink_callback *cb = commp->cb;
	287	const struct inet_diag_req_v2 *r = commp->r;
1cceda78	288	struct sctp_association *assoc;
8f840e47 XL	289	int err = 0;
8f840e47 XL	290
8f840e47	291	lock_sock(sk);
86fdb344 XL	292	if (!sctp_sk(sk)->ep)
	293	goto release;
	294	list_for_each_entry(assoc, &sctp_sk(sk)->ep->asocs, asocs) {
8f840e47 XL	295	if (cb->args[4] < cb->args[1])
	296	goto next;
	297
	298	if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
	299	r->id.idiag_sport)
	300	goto next;
	301	if (r->id.idiag_dport != htons(assoc->peer.port) &&
	302	r->id.idiag_dport)
	303	goto next;
	304
	305	if (!cb->args[3] &&
	306	inet_sctp_diag_fill(sk, NULL, skb, r,
	307	sk_user_ns(NETLINK_CB(cb->skb).sk),
	308	NETLINK_CB(cb->skb).portid,
	309	cb->nlh->nlmsg_seq,
d545caca LC	310	NLM_F_MULTI, cb->nlh,
d545caca LC	311	commp->net_admin) < 0) {
8f840e47	312	cb->args[3] = 1;
1cceda78	313	err = 1;
8f840e47 XL	314	goto release;
	315	}
	316	cb->args[3] = 1;
	317
	318	if (inet_sctp_diag_fill(sk, assoc, skb, r,
	319	sk_user_ns(NETLINK_CB(cb->skb).sk),
	320	NETLINK_CB(cb->skb).portid,
d545caca LC	321	cb->nlh->nlmsg_seq, 0, cb->nlh,
d545caca LC	322	commp->net_admin) < 0) {
1cceda78	323	err = 1;
8f840e47 XL	324	goto release;
	325	}
	326	next:
	327	cb->args[4]++;
	328	}
	329	cb->args[1] = 0;
	330	cb->args[2]++;
	331	cb->args[3] = 0;
	332	cb->args[4] = 0;
	333	release:
	334	release_sock(sk);
1cceda78	335	sock_put(sk);
8f840e47	336	return err;
1cceda78 XL	337	}
	338
	339	static int sctp_get_sock(struct sctp_transport tsp, void p)
	340	{
	341	struct sctp_endpoint *ep = tsp->asoc->ep;
	342	struct sctp_comm_param *commp = p;
	343	struct sock *sk = ep->base.sk;
	344	struct netlink_callback *cb = commp->cb;
	345	const struct inet_diag_req_v2 *r = commp->r;
	346	struct sctp_association *assoc =
	347	list_entry(ep->asocs.next, struct sctp_association, asocs);
	348
	349	/* find the ep only once through the transports by this condition */
	350	if (tsp->asoc != assoc)
	351	goto out;
	352
	353	if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
	354	goto out;
	355
	356	sock_hold(sk);
	357	cb->args[5] = (long)sk;
	358
	359	return 1;
	360
8f840e47 XL	361	out:
8f840e47 XL	362	cb->args[2]++;
1cceda78	363	return 0;
8f840e47 XL	364	}
	365
	366	static int sctp_ep_dump(struct sctp_endpoint ep, void p)
	367	{
	368	struct sctp_comm_param *commp = p;
	369	struct sock *sk = ep->base.sk;
	370	struct sk_buff *skb = commp->skb;
	371	struct netlink_callback *cb = commp->cb;
	372	const struct inet_diag_req_v2 *r = commp->r;
	373	struct net *net = sock_net(skb->sk);
	374	struct inet_sock *inet = inet_sk(sk);
	375	int err = 0;
	376
	377	if (!net_eq(sock_net(sk), net))
	378	goto out;
	379
	380	if (cb->args[4] < cb->args[1])
	381	goto next;
	382
1ba8d77f	383	if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
bed187b5 XL	384	goto next;
bed187b5 XL	385
8f840e47 XL	386	if (r->sdiag_family != AF_UNSPEC &&
	387	sk->sk_family != r->sdiag_family)
	388	goto next;
	389
	390	if (r->id.idiag_sport != inet->inet_sport &&
	391	r->id.idiag_sport)
	392	goto next;
	393
	394	if (r->id.idiag_dport != inet->inet_dport &&
	395	r->id.idiag_dport)
	396	goto next;
	397
	398	if (inet_sctp_diag_fill(sk, NULL, skb, r,
	399	sk_user_ns(NETLINK_CB(cb->skb).sk),
	400	NETLINK_CB(cb->skb).portid,
	401	cb->nlh->nlmsg_seq, NLM_F_MULTI,
d545caca	402	cb->nlh, commp->net_admin) < 0) {
8f840e47 XL	403	err = 2;
	404	goto out;
	405	}
	406	next:
	407	cb->args[4]++;
	408	out:
	409	return err;
	410	}
	411
	412	/* define the functions for sctp_diag_handler*/
	413	static void sctp_diag_get_info(struct sock sk, struct inet_diag_msg r,
	414	void *info)
	415	{
	416	struct sctp_infox infox = (struct sctp_infox )info;
	417
	418	if (infox->asoc) {
	419	r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
	420	r->idiag_wqueue = infox->asoc->sndbuf_used;
	421	} else {
	422	r->idiag_rqueue = sk->sk_ack_backlog;
	423	r->idiag_wqueue = sk->sk_max_ack_backlog;
	424	}
	425	if (infox->sctpinfo)
	426	sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
	427	}
	428
	429	static int sctp_diag_dump_one(struct sk_buff *in_skb,
	430	const struct nlmsghdr *nlh,
	431	const struct inet_diag_req_v2 *req)
	432	{
	433	struct net *net = sock_net(in_skb->sk);
	434	union sctp_addr laddr, paddr;
	435	struct sctp_comm_param commp = {
	436	.skb = in_skb,
	437	.r = req,
	438	.nlh = nlh,
d545caca	439	.net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN),
8f840e47 XL	440	};
	441
	442	if (req->sdiag_family == AF_INET) {
	443	laddr.v4.sin_port = req->id.idiag_sport;
	444	laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
	445	laddr.v4.sin_family = AF_INET;
	446
	447	paddr.v4.sin_port = req->id.idiag_dport;
	448	paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
	449	paddr.v4.sin_family = AF_INET;
	450	} else {
	451	laddr.v6.sin6_port = req->id.idiag_sport;
232cb53a LR	452	memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
232cb53a LR	453	sizeof(laddr.v6.sin6_addr));
8f840e47 XL	454	laddr.v6.sin6_family = AF_INET6;
	455
	456	paddr.v6.sin6_port = req->id.idiag_dport;
232cb53a LR	457	memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
232cb53a LR	458	sizeof(paddr.v6.sin6_addr));
8f840e47 XL	459	paddr.v6.sin6_family = AF_INET6;
	460	}
	461
	462	return sctp_transport_lookup_process(sctp_tsp_dump_one,
	463	net, &laddr, &paddr, &commp);
	464	}
	465
	466	static void sctp_diag_dump(struct sk_buff skb, struct netlink_callback cb,
	467	const struct inet_diag_req_v2 r, struct nlattr bc)
	468	{
	469	u32 idiag_states = r->idiag_states;
	470	struct net *net = sock_net(skb->sk);
	471	struct sctp_comm_param commp = {
	472	.skb = skb,
	473	.cb = cb,
	474	.r = r,
d545caca	475	.net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
8f840e47 XL	476	};
	477
	478	/* eps hashtable dumps
	479	* args:
	480	* 0 : if it will traversal listen sock
	481	* 1 : to record the sock pos of this time's traversal
	482	* 4 : to work as a temporary variable to traversal list
	483	*/
	484	if (cb->args[0] == 0) {
	485	if (!(idiag_states & TCPF_LISTEN))
	486	goto skip;
	487	if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
	488	goto done;
	489	skip:
	490	cb->args[0] = 1;
	491	cb->args[1] = 0;
	492	cb->args[4] = 0;
	493	}
	494
	495	/* asocs by transport hashtable dump
	496	* args:
	497	* 1 : to record the assoc pos of this time's traversal
	498	* 2 : to record the transport pos of this time's traversal
	499	* 3 : to mark if we have dumped the ep info of the current asoc
	500	* 4 : to work as a temporary variable to traversal list
1cceda78	501	* 5 : to save the sk we get from travelsing the tsp list.
8f840e47	502	*/
1ba8d77f	503	if (!(idiag_states & ~(TCPF_LISTEN \| TCPF_CLOSE)))
8f840e47	504	goto done;
1cceda78 XL	505
	506	next:
	507	cb->args[5] = 0;
	508	sctp_for_each_transport(sctp_get_sock, net, cb->args[2], &commp);
	509
	510	if (cb->args[5] && !sctp_sock_dump((struct sock *)cb->args[5], &commp))
	511	goto next;
	512
8f840e47 XL	513	done:
	514	cb->args[1] = cb->args[4];
	515	cb->args[4] = 0;
	516	}
	517
	518	static const struct inet_diag_handler sctp_diag_handler = {
	519	.dump = sctp_diag_dump,
	520	.dump_one = sctp_diag_dump_one,
	521	.idiag_get_info = sctp_diag_get_info,
	522	.idiag_type = IPPROTO_SCTP,
	523	.idiag_info_size = sizeof(struct sctp_info),
	524	};
	525
	526	static int __init sctp_diag_init(void)
	527	{
	528	return inet_diag_register(&sctp_diag_handler);
	529	}
	530
	531	static void __exit sctp_diag_exit(void)
	532	{
	533	inet_diag_unregister(&sctp_diag_handler);
	534	}
	535
	536	module_init(sctp_diag_init);
	537	module_exit(sctp_diag_exit);
	538	MODULE_LICENSE("GPL");
	539	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);