cregit-Linux how code gets into the kernel

Release 4.11 net/dccp/proto.c

Directory: net/dccp
/*
 *  net/dccp/proto.c
 *
 *  An implementation of the DCCP protocol
 *  Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *
 *      This program is free software; you can redistribute it and/or modify it
 *      under the terms of the GNU General Public License version 2 as
 *      published by the Free Software Foundation.
 */

#include <linux/dccp.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/in.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <net/checksum.h>

#include <net/inet_sock.h>
#include <net/sock.h>
#include <net/xfrm.h>

#include <asm/ioctls.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/poll.h>

#include "ccid.h"
#include "dccp.h"
#include "feat.h"

DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly;


EXPORT_SYMBOL_GPL(dccp_statistics);


struct percpu_counter dccp_orphan_count;

EXPORT_SYMBOL_GPL(dccp_orphan_count);


struct inet_hashinfo dccp_hashinfo;

EXPORT_SYMBOL_GPL(dccp_hashinfo);

/* the maximum queue length for tx in packets. 0 is no limit */

int sysctl_dccp_tx_qlen __read_mostly = 5;

#ifdef CONFIG_IP_DCCP_DEBUG



static const char *dccp_state_name(const int state)
{
	static const char *const dccp_state_names[] = {
	[DCCP_OPEN]		= "OPEN",
	[DCCP_REQUESTING]	= "REQUESTING",
	[DCCP_PARTOPEN]		= "PARTOPEN",
	[DCCP_LISTEN]		= "LISTEN",
	[DCCP_RESPOND]		= "RESPOND",
	[DCCP_CLOSING]		= "CLOSING",
	[DCCP_ACTIVE_CLOSEREQ]	= "CLOSEREQ",
	[DCCP_PASSIVE_CLOSE]	= "PASSIVE_CLOSE",
	[DCCP_PASSIVE_CLOSEREQ]	= "PASSIVE_CLOSEREQ",
	[DCCP_TIME_WAIT]	= "TIME_WAIT",
	[DCCP_CLOSED]		= "CLOSED",
        };

	if (state >= DCCP_MAX_STATES)
		return "INVALID STATE!";
	else
		return dccp_state_names[state];
}

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#endif




void dccp_set_state(struct sock *sk, const int state)
{
	const int oldstate = sk->sk_state;

	dccp_pr_debug("%s(%p)  %s  -->  %s\n", dccp_role(sk), sk,
		      dccp_state_name(oldstate), dccp_state_name(state));
	WARN_ON(state == oldstate);

	switch (state) {
	case DCCP_OPEN:
		if (oldstate != DCCP_OPEN)
			DCCP_INC_STATS(DCCP_MIB_CURRESTAB);
		/* Client retransmits all Confirm options until entering OPEN */
		if (oldstate == DCCP_PARTOPEN)
			dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg);
		break;

	case DCCP_CLOSED:
		if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ ||
		    oldstate == DCCP_CLOSING)
			DCCP_INC_STATS(DCCP_MIB_ESTABRESETS);

		sk->sk_prot->unhash(sk);
		if (inet_csk(sk)->icsk_bind_hash != NULL &&
		    !(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
			inet_put_port(sk);
		/* fall through */
	default:
		if (oldstate == DCCP_OPEN)
			DCCP_DEC_STATS(DCCP_MIB_CURRESTAB);
	}

	/* Change state AFTER socket is unhashed to avoid closed
         * socket sitting in hash tables.
         */
	sk->sk_state = state;
}


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EXPORT_SYMBOL_GPL(dccp_set_state);




static void dccp_finish_passive_close(struct sock *sk)
{
	switch (sk->sk_state) {
	case DCCP_PASSIVE_CLOSE:
		/* Node (client or server) has received Close packet. */
		dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED);
		dccp_set_state(sk, DCCP_CLOSED);
		break;
	case DCCP_PASSIVE_CLOSEREQ:
		/*
                 * Client received CloseReq. We set the `active' flag so that
                 * dccp_send_close() retransmits the Close as per RFC 4340, 8.3.
                 */
		dccp_send_close(sk, 1);
		dccp_set_state(sk, DCCP_CLOSING);
	}
}


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void dccp_done(struct sock *sk)
{
	dccp_set_state(sk, DCCP_CLOSED);
	dccp_clear_xmit_timers(sk);

	sk->sk_shutdown = SHUTDOWN_MASK;

	if (!sock_flag(sk, SOCK_DEAD))
		sk->sk_state_change(sk);
	else
		inet_csk_destroy_sock(sk);
}


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EXPORT_SYMBOL_GPL(dccp_done);




const char *dccp_packet_name(const int type)
{
	static const char *const dccp_packet_names[] = {
		[DCCP_PKT_REQUEST]  = "REQUEST",
		[DCCP_PKT_RESPONSE] = "RESPONSE",
		[DCCP_PKT_DATA]	    = "DATA",
		[DCCP_PKT_ACK]	    = "ACK",
		[DCCP_PKT_DATAACK]  = "DATAACK",
		[DCCP_PKT_CLOSEREQ] = "CLOSEREQ",
		[DCCP_PKT_CLOSE]    = "CLOSE",
		[DCCP_PKT_RESET]    = "RESET",
		[DCCP_PKT_SYNC]	    = "SYNC",
		[DCCP_PKT_SYNCACK]  = "SYNCACK",
        };

	if (type >= DCCP_NR_PKT_TYPES)
		return "INVALID";
	else
		return dccp_packet_names[type];
}


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EXPORT_SYMBOL_GPL(dccp_packet_name);




int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized)
{
	struct dccp_sock *dp = dccp_sk(sk);
	struct inet_connection_sock *icsk = inet_csk(sk);

	icsk->icsk_rto		= DCCP_TIMEOUT_INIT;
	icsk->icsk_syn_retries	= sysctl_dccp_request_retries;
	sk->sk_state		= DCCP_CLOSED;
	sk->sk_write_space	= dccp_write_space;
	icsk->icsk_sync_mss	= dccp_sync_mss;
	dp->dccps_mss_cache	= 536;
	dp->dccps_rate_last	= jiffies;
	dp->dccps_role		= DCCP_ROLE_UNDEFINED;
	dp->dccps_service	= DCCP_SERVICE_CODE_IS_ABSENT;
	dp->dccps_tx_qlen	= sysctl_dccp_tx_qlen;

	dccp_init_xmit_timers(sk);

	INIT_LIST_HEAD(&dp->dccps_featneg);
	/* control socket doesn't need feat nego */
	if (likely(ctl_sock_initialized))
		return dccp_feat_init(sk);
	return 0;
}


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EXPORT_SYMBOL_GPL(dccp_init_sock);




void dccp_destroy_sock(struct sock *sk)
{
	struct dccp_sock *dp = dccp_sk(sk);

	/*
         * DCCP doesn't use sk_write_queue, just sk_send_head
         * for retransmissions
         */
	if (sk->sk_send_head != NULL) {
		kfree_skb(sk->sk_send_head);
		sk->sk_send_head = NULL;
	}

	/* Clean up a referenced DCCP bind bucket. */
	if (inet_csk(sk)->icsk_bind_hash != NULL)
		inet_put_port(sk);

	kfree(dp->dccps_service_list);
	dp->dccps_service_list = NULL;

	if (dp->dccps_hc_rx_ackvec != NULL) {
		dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
		dp->dccps_hc_rx_ackvec = NULL;
	}
	ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
	ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
	dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;

	/* clean up feature negotiation state */
	dccp_feat_list_purge(&dp->dccps_featneg);
}


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EXPORT_SYMBOL_GPL(dccp_destroy_sock);




static inline int dccp_listen_start(struct sock *sk, int backlog)
{
	struct dccp_sock *dp = dccp_sk(sk);

	dp->dccps_role = DCCP_ROLE_LISTEN;
	/* do not start to listen if feature negotiation setup fails */
	if (dccp_feat_finalise_settings(dp))
		return -EPROTO;
	return inet_csk_listen_start(sk, backlog);
}


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static inline int dccp_need_reset(int state)
{
	return state != DCCP_CLOSED && state != DCCP_LISTEN &&
	       state != DCCP_REQUESTING;
}


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int dccp_disconnect(struct sock *sk, int flags)
{
	struct inet_connection_sock *icsk = inet_csk(sk);
	struct inet_sock *inet = inet_sk(sk);
	int err = 0;
	const int old_state = sk->sk_state;

	if (old_state != DCCP_CLOSED)
		dccp_set_state(sk, DCCP_CLOSED);

	/*
         * This corresponds to the ABORT function of RFC793, sec. 3.8
         * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted".
         */
	if (old_state == DCCP_LISTEN) {
		inet_csk_listen_stop(sk);
	} else if (dccp_need_reset(old_state)) {
		dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED);
		sk->sk_err = ECONNRESET;
	} else if (old_state == DCCP_REQUESTING)
		sk->sk_err = ECONNRESET;

	dccp_clear_xmit_timers(sk);

	__skb_queue_purge(&sk->sk_receive_queue);
	__skb_queue_purge(&sk->sk_write_queue);
	if (sk->sk_send_head != NULL) {
		__kfree_skb(sk->sk_send_head);
		sk->sk_send_head = NULL;
	}

	inet->inet_dport = 0;

	if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
		inet_reset_saddr(sk);

	sk->sk_shutdown = 0;
	sock_reset_flag(sk, SOCK_DONE);

	icsk->icsk_backoff = 0;
	inet_csk_delack_init(sk);
	__sk_dst_reset(sk);

	WARN_ON(inet->inet_num && !icsk->icsk_bind_hash);

	sk->sk_error_report(sk);
	return err;
}


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Total226100.00%5100.00%




EXPORT_SYMBOL_GPL(dccp_disconnect);

/*
 *      Wait for a DCCP event.
 *
 *      Note that we don't need to lock the socket, as the upper poll layers
 *      take care of normal races (between the test and the event) and we don't
 *      go look at any of the socket buffers directly.
 */



unsigned int dccp_poll(struct file *file, struct socket *sock,
		       poll_table *wait)
{
	unsigned int mask;
	struct sock *sk = sock->sk;

	sock_poll_wait(file, sk_sleep(sk), wait);
	if (sk->sk_state == DCCP_LISTEN)
		return inet_csk_listen_poll(sk);

	/* Socket is not locked. We are protected from async events
           by poll logic and correct handling of state changes
           made by another threads is impossible in any case.
         */

	mask = 0;
	if (sk->sk_err)
		mask = POLLERR;

	if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED)
		mask |= POLLHUP;
	if (sk->sk_shutdown & RCV_SHUTDOWN)
		mask |= POLLIN | POLLRDNORM | POLLRDHUP;

	/* Connected? */
	if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) {
		if (atomic_read(&sk->sk_rmem_alloc) > 0)
			mask |= POLLIN | POLLRDNORM;

		if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
			if (sk_stream_is_writeable(sk)) {
				mask |= POLLOUT | POLLWRNORM;
			} else {  /* send SIGIO later */
				sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
				set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);

				/* Race breaker. If space is freed after
                                 * wspace test but before the flags are set,
                                 * IO signal will be lost.
                                 */
				if (sk_stream_is_writeable(sk))
					mask |= POLLOUT | POLLWRNORM;
			}
		}
	}
	return mask;
}


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Total214100.00%6100.00%




EXPORT_SYMBOL_GPL(dccp_poll);




int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg)
{
	int rc = -ENOTCONN;

	lock_sock(sk);

	if (sk->sk_state == DCCP_LISTEN)
		goto out;

	switch (cmd) {
	case SIOCINQ: {
		struct sk_buff *skb;
		unsigned long amount = 0;

		skb = skb_peek(&sk->sk_receive_queue);
		if (skb != NULL) {
			/*
                         * We will only return the amount of this packet since
                         * that is all that will be read.
                         */
			amount = skb->len;
		}
		rc = put_user(amount, (int __user *)arg);
	}
		break;
	default:
		rc = -ENOIOCTLCMD;
		break;
	}
out:
	release_sock(sk);
	return rc;
}


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EXPORT_SYMBOL_GPL(dccp_ioctl);




static int dccp_setsockopt_service(struct sock *sk, const __be32 service,
				   char __user *optval, unsigned int optlen)
{
	struct dccp_sock *dp = dccp_sk(sk);
	struct dccp_service_list *sl = NULL;

	if (service == DCCP_SERVICE_INVALID_VALUE ||
	    optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32))
		return -EINVAL;

	if (optlen > sizeof(service)) {
		sl = kmalloc(optlen, GFP_KERNEL);
		if (sl == NULL)
			return -ENOMEM;

		sl->dccpsl_nr = optlen / sizeof(u32) - 1;
		if (copy_from_user(sl->dccpsl_list,
				   optval + sizeof(service),
				   optlen - sizeof(service)) ||
		    dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) {
			kfree(sl);
			return -EFAULT;
		}
	}

	lock_sock(sk);
	dp->dccps_service = service;

	kfree(dp->dccps_service_list);

	dp->dccps_service_list = sl;
	release_sock(sk);
	return 0;
}


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static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx)
{
	u8 *list, len;
	int i, rc;

	if (cscov < 0 || cscov > 15)
		return -EINVAL;
	/*
         * Populate a list of permissible values, in the range cscov...15. This
         * is necessary since feature negotiation of single values only works if
         * both sides incidentally choose the same value. Since the list starts
         * lowest-value first, negotiation will pick the smallest shared value.
         */
	if (cscov == 0)
		return 0;
	len = 16 - cscov;

	list = kmalloc(len, GFP_KERNEL);
	if (list == NULL)
		return -ENOBUFS;

	for (i = 0; i < len; i++)
		list[i] = cscov++;

	rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len);

	if (rc == 0) {
		if (rx)
			dccp_sk(sk)->dccps_pcrlen = cscov;
		else
			dccp_sk(sk)->dccps_pcslen = cscov;
	}
	kfree(list);
	return rc;
}


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static int dccp_setsockopt_ccid(struct sock *sk, int type,
				char __user *optval, unsigned int optlen)
{
	u8 *val;
	int rc = 0;

	if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS)
		return -EINVAL;

	val = memdup_user(optval, optlen);
	if (IS_ERR(val))
		return PTR_ERR(val);

	lock_sock(sk);
	if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID)
		rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen);

	if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID))
		rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen);
	release_sock(sk);

	kfree(val);
	return rc;
}


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static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
		char __user *optval, unsigned int optlen)
{
	struct dccp_sock *dp = dccp_sk(sk);
	int val, err = 0;

	switch (optname) {
	case DCCP_SOCKOPT_PACKET_SIZE:
		DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
		return 0;
	case DCCP_SOCKOPT_CHANGE_L:
	case DCCP_SOCKOPT_CHANGE_R:
		DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n");
		return 0;
	case DCCP_SOCKOPT_CCID:
	case DCCP_SOCKOPT_RX_CCID:
	case DCCP_SOCKOPT_TX_CCID:
		return dccp_setsockopt_ccid(sk, optname, optval, optlen);
	}

	if (optlen < (int)sizeof(int))
		return -EINVAL;

	if (get_user(val, (int __user *)optval))
		return -EFAULT;

	if (optname == DCCP_SOCKOPT_SERVICE)
		return dccp_setsockopt_service(sk, val, optval, optlen);

	lock_sock(sk);
	switch (optname) {
	case DCCP_SOCKOPT_SERVER_TIMEWAIT:
		if (dp->dccps_role != DCCP_ROLE_SERVER)
			err = -EOPNOTSUPP;
		else
			dp->dccps_server_timewait = (val != 0);
		break;
	case DCCP_SOCKOPT_SEND_CSCOV:
		err = dccp_setsockopt_cscov(sk, val, false);
		break;
	case DCCP_SOCKOPT_RECV_CSCOV:
		err = dccp_setsockopt_cscov(sk, val, true);
		break;
	case DCCP_SOCKOPT_QPOLICY_ID:
		if (sk->sk_state != DCCP_CLOSED)
			err = -EISCONN;
		else if (val < 0 || val >= DCCPQ_POLICY_MAX)
			err = -EINVAL;
		else
			dp->dccps_qpolicy = val;
		break;
	case DCCP_SOCKOPT_QPOLICY_TXQLEN:
		if (val < 0)
			err = -EINVAL;
		else
			dp->dccps_tx_qlen = val;
		break;
	default:
		err = -ENOPROTOOPT;
		break;
	}
	release_sock(sk);

	return err;
}


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David S. Miller10.34%17.14%


Total293100.00%14100.00%






int dccp_setsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, unsigned int optlen)
{
	if (level != SOL_DCCP)
		return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level,
							     optname, optval,
							     optlen);
	return do_dccp_setsockopt(sk, level, optname, optval, optlen);
}


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EXPORT_SYMBOL_GPL(dccp_setsockopt);

#ifdef CONFIG_COMPAT



int compat_dccp_setsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, unsigned int optlen)
{
	if (level != SOL_DCCP)
		return inet_csk_compat_setsockopt(sk, level, optname,
						  optval, optlen);
	return do_dccp_setsockopt(sk, level, optname, optval, optlen);
}


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EXPORT_SYMBOL_GPL(compat_dccp_setsockopt);
#endif




static int dccp_getsockopt_service(struct sock *sk, int len,
				   __be32 __user *optval,
				   int __user *optlen)
{
	const struct dccp_sock *dp = dccp_sk(sk);
	const struct dccp_service_list *sl;
	int err = -ENOENT, slen = 0, total_len = sizeof(u32);

	lock_sock(sk);
	if ((sl = dp->dccps_service_list) != NULL) {
		slen = sl->dccpsl_nr * sizeof(u32);
		total_len += slen;
	}

	err = -EINVAL;
	if (total_len > len)
		goto out;

	err = 0;
	if (put_user(total_len, optlen) ||
	    put_user(dp->dccps_service, optval) ||
	    (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen)))
		err = -EFAULT;
out:
	release_sock(sk);
	return err;
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo16199.38%150.00%


Andrea Bittau10.62%150.00%


Total162100.00%2100.00%






static int do_dccp_getsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, int __user *optlen)
{
	struct dccp_sock *dp;
	int val, len;

	if (get_user(len, optlen))
		return -EFAULT;

	if (len < (int)sizeof(int))
		return -EINVAL;

	dp = dccp_sk(sk);

	switch (optname) {
	case DCCP_SOCKOPT_PACKET_SIZE:
		DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
		return 0;
	case DCCP_SOCKOPT_SERVICE:
		return dccp_getsockopt_service(sk, len,
					       (__be32 __user *)optval, optlen);
	case DCCP_SOCKOPT_GET_CUR_MPS:
		val = dp->dccps_mss_cache;
		break;
	case DCCP_SOCKOPT_AVAILABLE_CCIDS:
		return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen);
	case DCCP_SOCKOPT_TX_CCID:
		val = ccid_get_current_tx_ccid(dp);
		if (val < 0)
			return -ENOPROTOOPT;
		break;
	case DCCP_SOCKOPT_RX_CCID:
		val = ccid_get_current_rx_ccid(dp);
		if (val < 0)
			return -ENOPROTOOPT;
		break;
	case DCCP_SOCKOPT_SERVER_TIMEWAIT:
		val = dp->dccps_server_timewait;
		break;
	case DCCP_SOCKOPT_SEND_CSCOV:
		val = dp->dccps_pcslen;
		break;
	case DCCP_SOCKOPT_RECV_CSCOV:
		val = dp->dccps_pcrlen;
		break;
	case DCCP_SOCKOPT_QPOLICY_ID:
		val = dp->dccps_qpolicy;
		break;
	case DCCP_SOCKOPT_QPOLICY_TXQLEN:
		val = dp->dccps_tx_qlen;
		break;
	case 128 ... 191:
		return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname,
					     len, (u32 __user *)optval, optlen);
	case 192 ... 255:
		return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname,
					     len, (u32 __user *)optval, optlen);
	default:
		return -ENOPROTOOPT;
	}

	len = sizeof(val);
	if (put_user(len, optlen) || copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo19059.19%741.18%


Gerrit Renker10833.64%741.18%


Tomasz Grobelny206.23%15.88%


Dmitry Mishin20.62%15.88%


Andrea Bittau10.31%15.88%


Total321100.00%17100.00%






int dccp_getsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, int __user *optlen)
{
	if (level != SOL_DCCP)
		return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level,
							     optname, optval,
							     optlen);
	return do_dccp_getsockopt(sk, level