Commit 8f840e47 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

sctp: add the sctp_diag.c file 



This one will implement all the interface of inet_diag, inet_diag_handler.
which includes sctp_diag_dump, sctp_diag_dump_one and sctp_diag_get_info.

It will work as a module, and register inet_diag_handler when loading.

v2->v3:
- fix the mistake in inet_assoc_attr_size().

- change inet_diag_msg_laddrs_fill() name to inet_diag_msg_sctpladdrs_fill.

- change inet_diag_msg_paddrs_fill() name to inet_diag_msg_sctpaddrs_fill.

- add inet_diag_msg_sctpinfo_fill() to make asoc/ep fill code clearer.

- add inet_diag_msg_sctpasoc_fill() to make asoc fill code clearer.

- merge inet_asoc_diag_fill() and inet_ep_diag_fill() to
  inet_sctp_diag_fill().

- call sctp_diag_get_info() directly, instead by handler, cause the caller
  is in the same file with it.

- call lock_sock in sctp_tsp_dump_one() to make sure we call get sctp info
  safely.

- after lock_sock(sk), we should check sk != assoc->base.sk.

- change mem[SK_MEMINFO_WMEM_ALLOC] to asoc->sndbuf_used for asoc dump when
  asoc->ep->sndbuf_policy is set. don't use INET_DIAG_MEMINFO attr any more.

Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cb2050a7

include/uapi/linux/inet_diag.h

+2 −0
Original line number Diff line number Diff line
@@ -113,6 +113,8 @@ enum { 
	INET_DIAG_DCTCPINFO,

	INET_DIAG_PROTOCOL,  /* response attribute only */

	INET_DIAG_SKV6ONLY,

	INET_DIAG_LOCALS,

	INET_DIAG_PEERS,

};



#define INET_DIAG_MAX INET_DIAG_SKV6ONLY

net/sctp/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -99,5 +99,9 @@ config SCTP_COOKIE_HMAC_SHA1 
	select CRYPTO_HMAC if SCTP_COOKIE_HMAC_SHA1

	select CRYPTO_SHA1 if SCTP_COOKIE_HMAC_SHA1



config INET_SCTP_DIAG

	depends on INET_DIAG

	def_tristate INET_DIAG





endif # IP_SCTP

net/sctp/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 


obj-$(CONFIG_IP_SCTP) += sctp.o

obj-$(CONFIG_NET_SCTPPROBE) += sctp_probe.o

obj-$(CONFIG_INET_SCTP_DIAG) += sctp_diag.o



sctp-y := sm_statetable.o sm_statefuns.o sm_sideeffect.o \

	  protocol.o endpointola.o associola.o \

net/sctp/sctp_diag.c

0 → 100644
+497 −0
Original line number Diff line number Diff line 
#include <linux/module.h>

#include <linux/inet_diag.h>

#include <linux/sock_diag.h>

#include <net/sctp/sctp.h>



extern void inet_diag_msg_common_fill(struct inet_diag_msg *r,

				      struct sock *sk);

extern int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,

				    struct inet_diag_msg *r, int ext,

				    struct user_namespace *user_ns);



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;



	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;

	r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;

	r->idiag_retrans = asoc->rtx_data_chunks;

#define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)

	r->idiag_expires =

		EXPIRES_IN_MS(asoc->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX]);

#undef EXPIRES_IN_MS

}



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, addrlen);

		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, addrlen);

		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)

{

	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))

		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;

		mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);

		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(skb, INET_DIAG_INFO,

				   sizeof(struct sctp_info));

		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;

};



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(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);

	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_tsp_dump(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 sk_buff *skb = commp->skb;

	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);

	int err = 0;



	/* 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;



	lock_sock(sk);

	if (sk != assoc->base.sk)

		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) < 0) {

			cb->args[3] = 1;

			err = 2;

			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) < 0) {

			err = 2;

			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);

	return err;

out:

	cb->args[2]++;

	return err;

}



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->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) < 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,

	};



	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, 64);

		laddr.v6.sin6_family = AF_INET6;



		paddr.v6.sin6_port = req->id.idiag_dport;

		memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst, 64);

		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,

	};



	/* 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

	 */

	if (!(idiag_states & ~TCPF_LISTEN))

		goto done;

	sctp_for_each_transport(sctp_tsp_dump, net, cb->args[2], &commp);

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);

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