sctp: Add socket option operation for Auto-ASCONF.
This patch allows the application to operate Auto-ASCONF on/off behavior via setsockopt() and getsockopt(). Signed-off-by: Michio Honda <micchie@sfc.wide.ad.jp> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Acked-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -92,6 +92,7 @@ typedef __s32 sctp_assoc_t;
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#define SCTP_LOCAL_AUTH_CHUNKS 27 /* Read only */
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#define SCTP_GET_ASSOC_NUMBER 28 /* Read only */
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#define SCTP_GET_ASSOC_ID_LIST 29 /* Read only */
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#define SCTP_AUTO_ASCONF 30
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/* Internal Socket Options. Some of the sctp library functions are
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* implemented using these socket options.
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@ -3356,6 +3356,46 @@ static int sctp_setsockopt_del_key(struct sock *sk,
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}
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/*
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* 8.1.23 SCTP_AUTO_ASCONF
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*
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* This option will enable or disable the use of the automatic generation of
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* ASCONF chunks to add and delete addresses to an existing association. Note
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* that this option has two caveats namely: a) it only affects sockets that
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* are bound to all addresses available to the SCTP stack, and b) the system
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* administrator may have an overriding control that turns the ASCONF feature
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* off no matter what setting the socket option may have.
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* This option expects an integer boolean flag, where a non-zero value turns on
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* the option, and a zero value turns off the option.
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* Note. In this implementation, socket operation overrides default parameter
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* being set by sysctl as well as FreeBSD implementation
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*/
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static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
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unsigned int optlen)
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{
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int val;
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struct sctp_sock *sp = sctp_sk(sk);
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if (optlen < sizeof(int))
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return -EINVAL;
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if (get_user(val, (int __user *)optval))
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return -EFAULT;
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if (!sctp_is_ep_boundall(sk) && val)
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return -EINVAL;
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if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
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return 0;
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if (val == 0 && sp->do_auto_asconf) {
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list_del(&sp->auto_asconf_list);
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sp->do_auto_asconf = 0;
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} else if (val && !sp->do_auto_asconf) {
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list_add_tail(&sp->auto_asconf_list,
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&sctp_auto_asconf_splist);
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sp->do_auto_asconf = 1;
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}
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return 0;
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}
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/* API 6.2 setsockopt(), getsockopt()
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*
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@ -3503,6 +3543,9 @@ SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
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case SCTP_AUTH_DELETE_KEY:
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retval = sctp_setsockopt_del_key(sk, optval, optlen);
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break;
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case SCTP_AUTO_ASCONF:
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retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
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break;
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default:
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retval = -ENOPROTOOPT;
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break;
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@ -5308,6 +5351,28 @@ static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
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return 0;
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}
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/*
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* 8.1.23 SCTP_AUTO_ASCONF
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* See the corresponding setsockopt entry as description
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*/
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static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
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char __user *optval, int __user *optlen)
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{
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int val = 0;
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if (len < sizeof(int))
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return -EINVAL;
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len = sizeof(int);
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if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
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val = 1;
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if (put_user(len, optlen))
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return -EFAULT;
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if (copy_to_user(optval, &val, len))
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return -EFAULT;
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return 0;
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}
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/*
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* 8.2.6. Get the Current Identifiers of Associations
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* (SCTP_GET_ASSOC_ID_LIST)
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@ -5492,6 +5557,9 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
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case SCTP_GET_ASSOC_ID_LIST:
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retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
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break;
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case SCTP_AUTO_ASCONF:
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retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
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break;
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default:
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retval = -ENOPROTOOPT;
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break;
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