Message-ID: <4AE0C64A.9080400@hp.com>
Date:	Thu, 22 Oct 2009 16:53:30 -0400
From:	Vlad Yasevich <vladislav.yasevich@...com>
To:	Amerigo Wang <amwang@...hat.com>
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [Patch] sctp: remove deprecated SCTP_GET_*_OLD stuffs


Amerigo Wang wrote:
> SCTP_GET_*_OLD stuffs are schedlued to be removed.
> 
> Cc: Vlad Yasevich <vladislav.yasevich@...com>
> Signed-off-by: WANG Cong <amwang@...hat.com>
> 
> 
> ---
> diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
> index 04e6c81..0b0eee5 100644
> --- a/Documentation/feature-removal-schedule.txt
> +++ b/Documentation/feature-removal-schedule.txt
> @@ -302,18 +302,6 @@ Who:	ocfs2-devel@....oracle.com
>  
>  ---------------------------
>  
> -What:	SCTP_GET_PEER_ADDRS_NUM_OLD, SCTP_GET_PEER_ADDRS_OLD,
> -	SCTP_GET_LOCAL_ADDRS_NUM_OLD, SCTP_GET_LOCAL_ADDRS_OLD
> -When: 	June 2009
> -Why:    A newer version of the options have been introduced in 2005 that
> -	removes the limitions of the old API.  The sctp library has been
> -        converted to use these new options at the same time.  Any user
> -	space app that directly uses the old options should convert to using
> -	the new options.
> -Who:	Vlad Yasevich <vladislav.yasevich@...com>
> -
> ----------------------------
> -
>  What:	Ability for non root users to shm_get hugetlb pages based on mlock
>  	resource limits
>  When:	2.6.31
> diff --git a/include/net/sctp/user.h b/include/net/sctp/user.h
> index be2334a..0991f1b 100644
> --- a/include/net/sctp/user.h
> +++ b/include/net/sctp/user.h
> @@ -131,14 +131,6 @@ enum sctp_optname {
>  #define SCTP_SOCKOPT_BINDX_REM	SCTP_SOCKOPT_BINDX_REM
>  	SCTP_SOCKOPT_PEELOFF, 	/* peel off association. */
>  #define SCTP_SOCKOPT_PEELOFF	SCTP_SOCKOPT_PEELOFF
> -	SCTP_GET_PEER_ADDRS_NUM_OLD, 	/* Get number of peer addresss. */
> -#define SCTP_GET_PEER_ADDRS_NUM_OLD	SCTP_GET_PEER_ADDRS_NUM_OLD
> -	SCTP_GET_PEER_ADDRS_OLD, 	/* Get all peer addresss. */
> -#define SCTP_GET_PEER_ADDRS_OLD	SCTP_GET_PEER_ADDRS_OLD
> -	SCTP_GET_LOCAL_ADDRS_NUM_OLD, 	/* Get number of local addresss. */
> -#define SCTP_GET_LOCAL_ADDRS_NUM_OLD	SCTP_GET_LOCAL_ADDRS_NUM_OLD
> -	SCTP_GET_LOCAL_ADDRS_OLD, 	/* Get all local addresss. */
> -#define SCTP_GET_LOCAL_ADDRS_OLD	SCTP_GET_LOCAL_ADDRS_OLD
>  	SCTP_SOCKOPT_CONNECTX_OLD, /* CONNECTX old requests. */

After running the regression suite against this patch I find that we can't
remove the enum values.  Removing the enums changes the value for the remainder
of the definitions and breaks binary compatibility for applications that use
those trailing options.

You should be ok with removing the #defines and actual code that uses them,
but not the enums.  You can even rename the enums, but we must preserve
numeric ordering.

Can you resubmit a corrected patch.

-vlad

>  #define SCTP_SOCKOPT_CONNECTX_OLD	SCTP_SOCKOPT_CONNECTX_OLD
>  	SCTP_GET_PEER_ADDRS, 	/* Get all peer addresss. */
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index c8d0575..1732a70 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -4339,90 +4339,6 @@ static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval
>  	return 0;
>  }
>  
> -static int sctp_getsockopt_peer_addrs_num_old(struct sock *sk, int len,
> -					      char __user *optval,
> -					      int __user *optlen)
> -{
> -	sctp_assoc_t id;
> -	struct sctp_association *asoc;
> -	struct list_head *pos;
> -	int cnt = 0;
> -
> -	if (len < sizeof(sctp_assoc_t))
> -		return -EINVAL;
> -
> -	if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
> -		return -EFAULT;
> -
> -	printk(KERN_WARNING "SCTP: Use of SCTP_GET_PEER_ADDRS_NUM_OLD "
> -			    "socket option deprecated\n");
> -	/* For UDP-style sockets, id specifies the association to query.  */
> -	asoc = sctp_id2assoc(sk, id);
> -	if (!asoc)
> -		return -EINVAL;
> -
> -	list_for_each(pos, &asoc->peer.transport_addr_list) {
> -		cnt ++;
> -	}
> -
> -	return cnt;
> -}
> -
> -/*
> - * Old API for getting list of peer addresses. Does not work for 32-bit
> - * programs running on a 64-bit kernel
> - */
> -static int sctp_getsockopt_peer_addrs_old(struct sock *sk, int len,
> -					  char __user *optval,
> -					  int __user *optlen)
> -{
> -	struct sctp_association *asoc;
> -	int cnt = 0;
> -	struct sctp_getaddrs_old getaddrs;
> -	struct sctp_transport *from;
> -	void __user *to;
> -	union sctp_addr temp;
> -	struct sctp_sock *sp = sctp_sk(sk);
> -	int addrlen;
> -
> -	if (len < sizeof(struct sctp_getaddrs_old))
> -		return -EINVAL;
> -
> -	len = sizeof(struct sctp_getaddrs_old);
> -
> -	if (copy_from_user(&getaddrs, optval, len))
> -		return -EFAULT;
> -
> -	if (getaddrs.addr_num <= 0) return -EINVAL;
> -
> -	printk(KERN_WARNING "SCTP: Use of SCTP_GET_PEER_ADDRS_OLD "
> -			    "socket option deprecated\n");
> -
> -	/* For UDP-style sockets, id specifies the association to query.  */
> -	asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
> -	if (!asoc)
> -		return -EINVAL;
> -
> -	to = (void __user *)getaddrs.addrs;
> -	list_for_each_entry(from, &asoc->peer.transport_addr_list,
> -				transports) {
> -		memcpy(&temp, &from->ipaddr, sizeof(temp));
> -		sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
> -		addrlen = sctp_get_af_specific(sk->sk_family)->sockaddr_len;
> -		if (copy_to_user(to, &temp, addrlen))
> -			return -EFAULT;
> -		to += addrlen ;
> -		cnt ++;
> -		if (cnt >= getaddrs.addr_num) break;
> -	}
> -	getaddrs.addr_num = cnt;
> -	if (put_user(len, optlen))
> -		return -EFAULT;
> -	if (copy_to_user(optval, &getaddrs, len))
> -		return -EFAULT;
> -
> -	return 0;
> -}
>  
>  static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
>  				      char __user *optval, int __user *optlen)
> @@ -4475,81 +4391,6 @@ static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
>  	return 0;
>  }
>  
> -static int sctp_getsockopt_local_addrs_num_old(struct sock *sk, int len,
> -					       char __user *optval,
> -					       int __user *optlen)
> -{
> -	sctp_assoc_t id;
> -	struct sctp_bind_addr *bp;
> -	struct sctp_association *asoc;
> -	struct sctp_sockaddr_entry *addr;
> -	int cnt = 0;
> -
> -	if (len < sizeof(sctp_assoc_t))
> -		return -EINVAL;
> -
> -	if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
> -		return -EFAULT;
> -
> -	printk(KERN_WARNING "SCTP: Use of SCTP_GET_LOCAL_ADDRS_NUM_OLD "
> -			    "socket option deprecated\n");
> -
> -	/*
> -	 *  For UDP-style sockets, id specifies the association to query.
> -	 *  If the id field is set to the value '0' then the locally bound
> -	 *  addresses are returned without regard to any particular
> -	 *  association.
> -	 */
> -	if (0 == id) {
> -		bp = &sctp_sk(sk)->ep->base.bind_addr;
> -	} else {
> -		asoc = sctp_id2assoc(sk, id);
> -		if (!asoc)
> -			return -EINVAL;
> -		bp = &asoc->base.bind_addr;
> -	}
> -
> -	/* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
> -	 * addresses from the global local address list.
> -	 */
> -	if (sctp_list_single_entry(&bp->address_list)) {
> -		addr = list_entry(bp->address_list.next,
> -				  struct sctp_sockaddr_entry, list);
> -		if (sctp_is_any(sk, &addr->a)) {
> -			rcu_read_lock();
> -			list_for_each_entry_rcu(addr,
> -						&sctp_local_addr_list, list) {
> -				if (!addr->valid)
> -					continue;
> -
> -				if ((PF_INET == sk->sk_family) &&
> -				    (AF_INET6 == addr->a.sa.sa_family))
> -					continue;
> -
> -				if ((PF_INET6 == sk->sk_family) &&
> -				    inet_v6_ipv6only(sk) &&
> -				    (AF_INET == addr->a.sa.sa_family))
> -					continue;
> -
> -				cnt++;
> -			}
> -			rcu_read_unlock();
> -		} else {
> -			cnt = 1;
> -		}
> -		goto done;
> -	}
> -
> -	/* Protection on the bound address list is not needed,
> -	 * since in the socket option context we hold the socket lock,
> -	 * so there is no way that the bound address list can change.
> -	 */
> -	list_for_each_entry(addr, &bp->address_list, list) {
> -		cnt ++;
> -	}
> -done:
> -	return cnt;
> -}
>  
>  /* Helper function that copies local addresses to user and returns the number
>   * of addresses copied.
> @@ -4637,112 +4478,6 @@ static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
>  	return cnt;
>  }
>  
> -/* Old API for getting list of local addresses. Does not work for 32-bit
> - * programs running on a 64-bit kernel
> - */
> -static int sctp_getsockopt_local_addrs_old(struct sock *sk, int len,
> -					   char __user *optval, int __user *optlen)
> -{
> -	struct sctp_bind_addr *bp;
> -	struct sctp_association *asoc;
> -	int cnt = 0;
> -	struct sctp_getaddrs_old getaddrs;
> -	struct sctp_sockaddr_entry *addr;
> -	void __user *to;
> -	union sctp_addr temp;
> -	struct sctp_sock *sp = sctp_sk(sk);
> -	int addrlen;
> -	int err = 0;
> -	void *addrs;
> -	void *buf;
> -	int bytes_copied = 0;
> -
> -	if (len < sizeof(struct sctp_getaddrs_old))
> -		return -EINVAL;
> -
> -	len = sizeof(struct sctp_getaddrs_old);
> -	if (copy_from_user(&getaddrs, optval, len))
> -		return -EFAULT;
> -
> -	if (getaddrs.addr_num <= 0 ||
> -	    getaddrs.addr_num >= (INT_MAX / sizeof(union sctp_addr)))
> -		return -EINVAL;
> -
> -	printk(KERN_WARNING "SCTP: Use of SCTP_GET_LOCAL_ADDRS_OLD "
> -			    "socket option deprecated\n");
> -
> -	/*
> -	 *  For UDP-style sockets, id specifies the association to query.
> -	 *  If the id field is set to the value '0' then the locally bound
> -	 *  addresses are returned without regard to any particular
> -	 *  association.
> -	 */
> -	if (0 == getaddrs.assoc_id) {
> -		bp = &sctp_sk(sk)->ep->base.bind_addr;
> -	} else {
> -		asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
> -		if (!asoc)
> -			return -EINVAL;
> -		bp = &asoc->base.bind_addr;
> -	}
> -
> -	to = getaddrs.addrs;
> -
> -	/* Allocate space for a local instance of packed array to hold all
> -	 * the data.  We store addresses here first and then put write them
> -	 * to the user in one shot.
> -	 */
> -	addrs = kmalloc(sizeof(union sctp_addr) * getaddrs.addr_num,
> -			GFP_KERNEL);
> -	if (!addrs)
> -		return -ENOMEM;
> -
> -	/* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
> -	 * addresses from the global local address list.
> -	 */
> -	if (sctp_list_single_entry(&bp->address_list)) {
> -		addr = list_entry(bp->address_list.next,
> -				  struct sctp_sockaddr_entry, list);
> -		if (sctp_is_any(sk, &addr->a)) {
> -			cnt = sctp_copy_laddrs_old(sk, bp->port,
> -						   getaddrs.addr_num,
> -						   addrs, &bytes_copied);
> -			goto copy_getaddrs;
> -		}
> -	}
> -
> -	buf = addrs;
> -	/* Protection on the bound address list is not needed since
> -	 * in the socket option context we hold a socket lock and
> -	 * thus the bound address list can't change.
> -	 */
> -	list_for_each_entry(addr, &bp->address_list, list) {
> -		memcpy(&temp, &addr->a, sizeof(temp));
> -		sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
> -		addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
> -		memcpy(buf, &temp, addrlen);
> -		buf += addrlen;
> -		bytes_copied += addrlen;
> -		cnt ++;
> -		if (cnt >= getaddrs.addr_num) break;
> -	}
> -
> -copy_getaddrs:
> -	/* copy the entire address list into the user provided space */
> -	if (copy_to_user(to, addrs, bytes_copied)) {
> -		err = -EFAULT;
> -		goto error;
> -	}
> -
> -	/* copy the leading structure back to user */
> -	getaddrs.addr_num = cnt;
> -	if (copy_to_user(optval, &getaddrs, len))
> -		err = -EFAULT;
> -
> -error:
> -	kfree(addrs);
> -	return err;
> -}
>  
>  static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
>  				       char __user *optval, int __user *optlen)
> @@ -5593,22 +5328,6 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
>  	case SCTP_INITMSG:
>  		retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
>  		break;
> -	case SCTP_GET_PEER_ADDRS_NUM_OLD:
> -		retval = sctp_getsockopt_peer_addrs_num_old(sk, len, optval,
> -							    optlen);
> -		break;
> -	case SCTP_GET_LOCAL_ADDRS_NUM_OLD:
> -		retval = sctp_getsockopt_local_addrs_num_old(sk, len, optval,
> -							     optlen);
> -		break;
> -	case SCTP_GET_PEER_ADDRS_OLD:
> -		retval = sctp_getsockopt_peer_addrs_old(sk, len, optval,
> -							optlen);
> -		break;
> -	case SCTP_GET_LOCAL_ADDRS_OLD:
> -		retval = sctp_getsockopt_local_addrs_old(sk, len, optval,
> -							 optlen);
> -		break;
>  	case SCTP_GET_PEER_ADDRS:
>  		retval = sctp_getsockopt_peer_addrs(sk, len, optval,
>  						    optlen);
> 
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