diff options
Diffstat (limited to 'net/sctp/socket.c')
| -rw-r--r-- | net/sctp/socket.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c index fa29eae83e9..bdd8bd428b6 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -2746,6 +2746,46 @@ static int sctp_setsockopt_adaption_layer(struct sock *sk, char __user *optval, return 0; } +/* + * 7.1.29. Set or Get the default context (SCTP_CONTEXT) + * + * The context field in the sctp_sndrcvinfo structure is normally only + * used when a failed message is retrieved holding the value that was + * sent down on the actual send call. This option allows the setting of + * a default context on an association basis that will be received on + * reading messages from the peer. This is especially helpful in the + * one-2-many model for an application to keep some reference to an + * internal state machine that is processing messages on the + * association. Note that the setting of this value only effects + * received messages from the peer and does not effect the value that is + * saved with outbound messages. + */ +static int sctp_setsockopt_context(struct sock *sk, char __user *optval, + int optlen) +{ + struct sctp_assoc_value params; + struct sctp_sock *sp; + struct sctp_association *asoc; + + if (optlen != sizeof(struct sctp_assoc_value)) + return -EINVAL; + if (copy_from_user(¶ms, optval, optlen)) + return -EFAULT; + + sp = sctp_sk(sk); + + if (params.assoc_id != 0) { + asoc = sctp_id2assoc(sk, params.assoc_id); + if (!asoc) + return -EINVAL; + asoc->default_rcv_context = params.assoc_value; + } else { + sp->default_rcv_context = params.assoc_value; + } + + return 0; +} + /* API 6.2 setsockopt(), getsockopt() * * Applications use setsockopt() and getsockopt() to set or retrieve @@ -2857,6 +2897,9 @@ SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname, case SCTP_ADAPTION_LAYER: retval = sctp_setsockopt_adaption_layer(sk, optval, optlen); break; + case SCTP_CONTEXT: + retval = sctp_setsockopt_context(sk, optval, optlen); + break; default: retval = -ENOPROTOOPT; @@ -3016,6 +3059,8 @@ SCTP_STATIC int sctp_init_sock(struct sock *sk) sp->default_context = 0; sp->default_timetolive = 0; + sp->default_rcv_context = 0; + /* Initialize default setup parameters. These parameters * can be modified with the SCTP_INITMSG socket option or * overridden by the SCTP_INIT CMSG. @@ -4421,6 +4466,42 @@ static int sctp_getsockopt_mappedv4(struct sock *sk, int len, } /* + * 7.1.29. Set or Get the default context (SCTP_CONTEXT) + * (chapter and verse is quoted at sctp_setsockopt_context()) + */ +static int sctp_getsockopt_context(struct sock *sk, int len, + char __user *optval, int __user *optlen) +{ + struct sctp_assoc_value params; + struct sctp_sock *sp; + struct sctp_association *asoc; + + if (len != sizeof(struct sctp_assoc_value)) + return -EINVAL; + + if (copy_from_user(¶ms, optval, len)) + return -EFAULT; + + sp = sctp_sk(sk); + + if (params.assoc_id != 0) { + asoc = sctp_id2assoc(sk, params.assoc_id); + if (!asoc) + return -EINVAL; + params.assoc_value = asoc->default_rcv_context; + } else { + params.assoc_value = sp->default_rcv_context; + } + + if (put_user(len, optlen)) + return -EFAULT; + if (copy_to_user(optval, ¶ms, len)) + return -EFAULT; + + return 0; +} + +/* * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG) * * This socket option specifies the maximum size to put in any outgoing @@ -4558,6 +4639,9 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname, retval = sctp_getsockopt_adaption_layer(sk, len, optval, optlen); break; + case SCTP_CONTEXT: + retval = sctp_getsockopt_context(sk, len, optval, optlen); + break; default: retval = -ENOPROTOOPT; break; |