1 files changed, 275 insertions, 54 deletions

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 429899689408..634a2abb5f3a 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -254,7 +254,7 @@ static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
         if (id_asoc && (id_asoc != addr_asoc))
                 return NULL;
 
-        sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
+        sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
                                                 (union sctp_addr *)addr);
 
         return transport;
@@ -396,7 +396,7 @@ static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
         /* Copy back into socket for getsockname() use. */
         if (!ret) {
                 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
-                af->to_sk_saddr(addr, sk);
+                sp->pf->to_sk_saddr(addr, sk);
         }
 
         return ret;
@@ -1053,7 +1053,6 @@ static int __sctp_connect(struct sock *sk,
         struct sctp_association *asoc2;
         struct sctp_transport *transport;
         union sctp_addr to;
-        struct sctp_af *af;
         sctp_scope_t scope;
         long timeo;
         int err = 0;
@@ -1081,6 +1080,8 @@ static int __sctp_connect(struct sock *sk,
         /* Walk through the addrs buffer and count the number of addresses. */
         addr_buf = kaddrs;
         while (walk_size < addrs_size) {
+                struct sctp_af *af;
+
                 if (walk_size + sizeof(sa_family_t) > addrs_size) {
                         err = -EINVAL;
                         goto out_free;
@@ -1205,8 +1206,7 @@ static int __sctp_connect(struct sock *sk,
 
         /* Initialize sk's dport and daddr for getpeername() */
         inet_sk(sk)->inet_dport = htons(asoc->peer.port);
-        af = sctp_get_af_specific(sa_addr->sa.sa_family);
-        af->to_sk_daddr(sa_addr, sk);
+        sp->pf->to_sk_daddr(sa_addr, sk);
         sk->sk_err = 0;
 
         /* in-kernel sockets don't generally have a file allocated to them
@@ -1602,12 +1602,13 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
         struct sctp_initmsg *sinit;
         sctp_assoc_t associd = 0;
         sctp_cmsgs_t cmsgs = { NULL };
-        int err;
         sctp_scope_t scope;
-        long timeo;
-        __u16 sinfo_flags = 0;
+        bool fill_sinfo_ttl = false;
         struct sctp_datamsg *datamsg;
         int msg_flags = msg->msg_flags;
+        __u16 sinfo_flags = 0;
+        long timeo;
+        int err;
 
         err = 0;
         sp = sctp_sk(sk);
@@ -1648,10 +1649,21 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
                 msg_name = msg->msg_name;
         }
 
-        sinfo = cmsgs.info;
         sinit = cmsgs.init;
+        if (cmsgs.sinfo != NULL) {
+                memset(&default_sinfo, 0, sizeof(default_sinfo));
+                default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
+                default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
+                default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
+                default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
+                default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
 
-        /* Did the user specify SNDRCVINFO?  */
+                sinfo = &default_sinfo;
+                fill_sinfo_ttl = true;
+        } else {
+                sinfo = cmsgs.srinfo;
+        }
+        /* Did the user specify SNDINFO/SNDRCVINFO? */
         if (sinfo) {
                 sinfo_flags = sinfo->sinfo_flags;
                 associd = sinfo->sinfo_assoc_id;
@@ -1858,8 +1870,8 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
         pr_debug("%s: we have a valid association\n", __func__);
 
         if (!sinfo) {
-                /* If the user didn't specify SNDRCVINFO, make up one with
-                 * some defaults.
+                /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
+                 * one with some defaults.
                  */
                 memset(&default_sinfo, 0, sizeof(default_sinfo));
                 default_sinfo.sinfo_stream = asoc->default_stream;
@@ -1868,7 +1880,13 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
                 default_sinfo.sinfo_context = asoc->default_context;
                 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
                 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
+
                 sinfo = &default_sinfo;
+        } else if (fill_sinfo_ttl) {
+                /* In case SNDINFO was specified, we still need to fill
+                 * it with a default ttl from the assoc here.
+                 */
+                sinfo->sinfo_timetolive = asoc->default_timetolive;
         }
 
         /* API 7.1.7, the sndbuf size per association bounds the
@@ -2042,8 +2060,6 @@ static int sctp_skb_pull(struct sk_buff *skb, int len)
  *  flags   - flags sent or received with the user message, see Section
  *            5 for complete description of the flags.
  */
-static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
-
 static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
                         struct msghdr *msg, size_t len, int noblock,
                         int flags, int *addr_len)
@@ -2094,9 +2110,16 @@ static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
                 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
         }
 
+        /* Check if we allow SCTP_NXTINFO. */
+        if (sp->recvnxtinfo)
+                sctp_ulpevent_read_nxtinfo(event, msg, sk);
+        /* Check if we allow SCTP_RCVINFO. */
+        if (sp->recvrcvinfo)
+                sctp_ulpevent_read_rcvinfo(event, msg);
         /* Check if we allow SCTP_SNDRCVINFO. */
         if (sp->subscribe.sctp_data_io_event)
                 sctp_ulpevent_read_sndrcvinfo(event, msg);
+
 #if 0
         /* FIXME: we should be calling IP/IPv6 layers.  */
         if (sk->sk_protinfo.af_inet.cmsg_flags)
@@ -2182,8 +2205,13 @@ static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
         if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
                 return -EFAULT;
 
-        /*
-         * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
+        if (sctp_sk(sk)->subscribe.sctp_data_io_event)
+                pr_warn_ratelimited(DEPRECATED "%s (pid %d) "
+                                    "Requested SCTP_SNDRCVINFO event.\n"
+                                    "Use SCTP_RCVINFO through SCTP_RECVRCVINFO option instead.\n",
+                                    current->comm, task_pid_nr(current));
+
+        /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
          * if there is no data to be sent or retransmit, the stack will
          * immediately send up this notification.
          */
@@ -2747,19 +2775,22 @@ static int sctp_setsockopt_default_send_param(struct sock *sk,
                                               char __user *optval,
                                               unsigned int optlen)
 {
-        struct sctp_sndrcvinfo info;
-        struct sctp_association *asoc;
         struct sctp_sock *sp = sctp_sk(sk);
+        struct sctp_association *asoc;
+        struct sctp_sndrcvinfo info;
 
-        if (optlen != sizeof(struct sctp_sndrcvinfo))
+        if (optlen != sizeof(info))
                 return -EINVAL;
         if (copy_from_user(&info, optval, optlen))
                 return -EFAULT;
+        if (info.sinfo_flags &
+            ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
+              SCTP_ABORT | SCTP_EOF))
+                return -EINVAL;
 
         asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
         if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
                 return -EINVAL;
-
         if (asoc) {
                 asoc->default_stream = info.sinfo_stream;
                 asoc->default_flags = info.sinfo_flags;
@@ -2777,6 +2808,44 @@ static int sctp_setsockopt_default_send_param(struct sock *sk,
         return 0;
 }
 
+/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
+ * (SCTP_DEFAULT_SNDINFO)
+ */
+static int sctp_setsockopt_default_sndinfo(struct sock *sk,
+                                           char __user *optval,
+                                           unsigned int optlen)
+{
+        struct sctp_sock *sp = sctp_sk(sk);
+        struct sctp_association *asoc;
+        struct sctp_sndinfo info;
+
+        if (optlen != sizeof(info))
+                return -EINVAL;
+        if (copy_from_user(&info, optval, optlen))
+                return -EFAULT;
+        if (info.snd_flags &
+            ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
+              SCTP_ABORT | SCTP_EOF))
+                return -EINVAL;
+
+        asoc = sctp_id2assoc(sk, info.snd_assoc_id);
+        if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
+                return -EINVAL;
+        if (asoc) {
+                asoc->default_stream = info.snd_sid;
+                asoc->default_flags = info.snd_flags;
+                asoc->default_ppid = info.snd_ppid;
+                asoc->default_context = info.snd_context;
+        } else {
+                sp->default_stream = info.snd_sid;
+                sp->default_flags = info.snd_flags;
+                sp->default_ppid = info.snd_ppid;
+                sp->default_context = info.snd_context;
+        }
+
+        return 0;
+}
+
 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
  *
  * Requests that the local SCTP stack use the enclosed peer address as
@@ -3523,7 +3592,6 @@ static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
         return 0;
 }
 
-
 /*
  * SCTP_PEER_ADDR_THLDS
  *
@@ -3574,6 +3642,38 @@ static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
         return 0;
 }
 
+static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
+                                       char __user *optval,
+                                       unsigned int optlen)
+{
+        int val;
+
+        if (optlen < sizeof(int))
+                return -EINVAL;
+        if (get_user(val, (int __user *) optval))
+                return -EFAULT;
+
+        sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
+
+        return 0;
+}
+
+static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
+                                       char __user *optval,
+                                       unsigned int optlen)
+{
+        int val;
+
+        if (optlen < sizeof(int))
+                return -EINVAL;
+        if (get_user(val, (int __user *) optval))
+                return -EFAULT;
+
+        sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
+
+        return 0;
+}
+
 /* API 6.2 setsockopt(), getsockopt()
  *
  * Applications use setsockopt() and getsockopt() to set or retrieve
@@ -3671,6 +3771,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
                 retval = sctp_setsockopt_default_send_param(sk, optval,
                                                             optlen);
                 break;
+        case SCTP_DEFAULT_SNDINFO:
+                retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
+                break;
         case SCTP_PRIMARY_ADDR:
                 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
                 break;
@@ -3725,6 +3828,12 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
         case SCTP_PEER_ADDR_THLDS:
                 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
                 break;
+        case SCTP_RECVRCVINFO:
+                retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
+                break;
+        case SCTP_RECVNXTINFO:
+                retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
+                break;
         default:
                 retval = -ENOPROTOOPT;
                 break;
@@ -3971,6 +4080,9 @@ static int sctp_init_sock(struct sock *sk)
         /* Enable Nagle algorithm by default.  */
         sp->nodelay           = 0;
 
+        sp->recvrcvinfo = 0;
+        sp->recvnxtinfo = 0;
+
         /* Enable by default. */
         sp->v4mapped          = 1;
 
@@ -4131,7 +4243,7 @@ static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
         transport = asoc->peer.primary_path;
 
         status.sstat_assoc_id = sctp_assoc2id(asoc);
-        status.sstat_state = asoc->state;
+        status.sstat_state = sctp_assoc_to_state(asoc);
         status.sstat_rwnd =  asoc->peer.rwnd;
         status.sstat_unackdata = asoc->unack_data;
 
@@ -4143,7 +4255,7 @@ static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
         memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
                         transport->af_specific->sockaddr_len);
         /* Map ipv4 address into v4-mapped-on-v6 address.  */
-        sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
+        sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
                 (union sctp_addr *)&status.sstat_primary.spinfo_address);
         status.sstat_primary.spinfo_state = transport->state;
         status.sstat_primary.spinfo_cwnd = transport->cwnd;
@@ -4301,8 +4413,8 @@ static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optv
 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
 {
         struct sctp_association *asoc = sctp_id2assoc(sk, id);
+        struct sctp_sock *sp = sctp_sk(sk);
         struct socket *sock;
-        struct sctp_af *af;
         int err = 0;
 
         if (!asoc)
@@ -4324,8 +4436,7 @@ int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
         /* Make peeled-off sockets more like 1-1 accepted sockets.
          * Set the daddr and initialize id to something more random
          */
-        af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
-        af->to_sk_daddr(&asoc->peer.primary_addr, sk);
+        sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
 
         /* Populate the fields of the newsk from the oldsk and migrate the
          * asoc to the newsk.
@@ -4709,8 +4820,8 @@ static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
         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(temp.sa.sa_family)->sockaddr_len;
+                addrlen = sctp_get_pf_specific(sk->sk_family)
+                              ->addr_to_user(sp, &temp);
                 if (space_left < addrlen)
                         return -ENOMEM;
                 if (copy_to_user(to, &temp, addrlen))
@@ -4754,9 +4865,9 @@ static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
                 if (!temp.v4.sin_port)
                         temp.v4.sin_port = htons(port);
 
-                sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
-                                                                &temp);
-                addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
+                addrlen = sctp_get_pf_specific(sk->sk_family)
+                              ->addr_to_user(sctp_sk(sk), &temp);
+
                 if (space_left < addrlen) {
                         cnt =  -ENOMEM;
                         break;
@@ -4844,8 +4955,8 @@ static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
          */
         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;
+                addrlen = sctp_get_pf_specific(sk->sk_family)
+                              ->addr_to_user(sp, &temp);
                 if (space_left < addrlen) {
                         err =  -ENOMEM; /*fixme: right error?*/
                         goto out;
@@ -4904,7 +5015,7 @@ static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
         memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
                 asoc->peer.primary_path->af_specific->sockaddr_len);
 
-        sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
+        sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
                         (union sctp_addr *)&prim.ssp_addr);
 
         if (put_user(len, optlen))
@@ -4964,14 +5075,14 @@ static int sctp_getsockopt_default_send_param(struct sock *sk,
                                         int len, char __user *optval,
                                         int __user *optlen)
 {
-        struct sctp_sndrcvinfo info;
-        struct sctp_association *asoc;
         struct sctp_sock *sp = sctp_sk(sk);
+        struct sctp_association *asoc;
+        struct sctp_sndrcvinfo info;
 
-        if (len < sizeof(struct sctp_sndrcvinfo))
+        if (len < sizeof(info))
                 return -EINVAL;
 
-        len = sizeof(struct sctp_sndrcvinfo);
+        len = sizeof(info);
 
         if (copy_from_user(&info, optval, len))
                 return -EFAULT;
@@ -4979,7 +5090,6 @@ static int sctp_getsockopt_default_send_param(struct sock *sk,
         asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
         if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
                 return -EINVAL;
-
         if (asoc) {
                 info.sinfo_stream = asoc->default_stream;
                 info.sinfo_flags = asoc->default_flags;
@@ -5002,6 +5112,48 @@ static int sctp_getsockopt_default_send_param(struct sock *sk,
         return 0;
 }
 
+/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
+ * (SCTP_DEFAULT_SNDINFO)
+ */
+static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
+                                           char __user *optval,
+                                           int __user *optlen)
+{
+        struct sctp_sock *sp = sctp_sk(sk);
+        struct sctp_association *asoc;
+        struct sctp_sndinfo info;
+
+        if (len < sizeof(info))
+                return -EINVAL;
+
+        len = sizeof(info);
+
+        if (copy_from_user(&info, optval, len))
+                return -EFAULT;
+
+        asoc = sctp_id2assoc(sk, info.snd_assoc_id);
+        if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
+                return -EINVAL;
+        if (asoc) {
+                info.snd_sid = asoc->default_stream;
+                info.snd_flags = asoc->default_flags;
+                info.snd_ppid = asoc->default_ppid;
+                info.snd_context = asoc->default_context;
+        } else {
+                info.snd_sid = sp->default_stream;
+                info.snd_flags = sp->default_flags;
+                info.snd_ppid = sp->default_ppid;
+                info.snd_context = sp->default_context;
+        }
+
+        if (put_user(len, optlen))
+                return -EFAULT;
+        if (copy_to_user(optval, &info, len))
+                return -EFAULT;
+
+        return 0;
+}
+
 /*
  *
  * 7.1.5 SCTP_NODELAY
@@ -5752,6 +5904,46 @@ static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
         return 0;
 }
 
+static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
+                                       char __user *optval,
+                                       int __user *optlen)
+{
+        int val = 0;
+
+        if (len < sizeof(int))
+                return -EINVAL;
+
+        len = sizeof(int);
+        if (sctp_sk(sk)->recvrcvinfo)
+                val = 1;
+        if (put_user(len, optlen))
+                return -EFAULT;
+        if (copy_to_user(optval, &val, len))
+                return -EFAULT;
+
+        return 0;
+}
+
+static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
+                                       char __user *optval,
+                                       int __user *optlen)
+{
+        int val = 0;
+
+        if (len < sizeof(int))
+                return -EINVAL;
+
+        len = sizeof(int);
+        if (sctp_sk(sk)->recvnxtinfo)
+                val = 1;
+        if (put_user(len, optlen))
+                return -EFAULT;
+        if (copy_to_user(optval, &val, len))
+                return -EFAULT;
+
+        return 0;
+}
+
 static int sctp_getsockopt(struct sock *sk, int level, int optname,
                            char __user *optval, int __user *optlen)
 {
@@ -5821,6 +6013,10 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname,
                 retval = sctp_getsockopt_default_send_param(sk, len,
                                                             optval, optlen);
                 break;
+        case SCTP_DEFAULT_SNDINFO:
+                retval = sctp_getsockopt_default_sndinfo(sk, len,
+                                                         optval, optlen);
+                break;
         case SCTP_PRIMARY_ADDR:
                 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
                 break;
@@ -5895,6 +6091,12 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname,
         case SCTP_GET_ASSOC_STATS:
                 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
                 break;
+        case SCTP_RECVRCVINFO:
+                retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
+                break;
+        case SCTP_RECVNXTINFO:
+                retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
+                break;
         default:
                 retval = -ENOPROTOOPT;
                 break;
@@ -6390,8 +6592,7 @@ static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
         struct cmsghdr *cmsg;
         struct msghdr *my_msg = (struct msghdr *)msg;
 
-        for (cmsg = CMSG_FIRSTHDR(msg);
-             cmsg != NULL;
+        for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL;
              cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
                 if (!CMSG_OK(my_msg, cmsg))
                         return -EINVAL;
@@ -6404,7 +6605,7 @@ static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
                 switch (cmsg->cmsg_type) {
                 case SCTP_INIT:
                         /* SCTP Socket API Extension
-                         * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
+                         * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
                          *
                          * This cmsghdr structure provides information for
                          * initializing new SCTP associations with sendmsg().
@@ -6416,15 +6617,15 @@ static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
                          * ------------  ------------   ----------------------
                          * IPPROTO_SCTP  SCTP_INIT      struct sctp_initmsg
                          */
-                        if (cmsg->cmsg_len !=
-                            CMSG_LEN(sizeof(struct sctp_initmsg)))
+                        if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
                                 return -EINVAL;
-                        cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
+
+                        cmsgs->init = CMSG_DATA(cmsg);
                         break;
 
                 case SCTP_SNDRCV:
                         /* SCTP Socket API Extension
-                         * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
+                         * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
                          *
                          * This cmsghdr structure specifies SCTP options for
                          * sendmsg() and describes SCTP header information
@@ -6434,24 +6635,44 @@ static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
                          * ------------  ------------   ----------------------
                          * IPPROTO_SCTP  SCTP_SNDRCV    struct sctp_sndrcvinfo
                          */
-                        if (cmsg->cmsg_len !=
-                            CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
+                        if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
                                 return -EINVAL;
 
-                        cmsgs->info =
-                                (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
+                        cmsgs->srinfo = CMSG_DATA(cmsg);
 
-                        /* Minimally, validate the sinfo_flags. */
-                        if (cmsgs->info->sinfo_flags &
+                        if (cmsgs->srinfo->sinfo_flags &
                             ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
                               SCTP_ABORT | SCTP_EOF))
                                 return -EINVAL;
                         break;
 
+                case SCTP_SNDINFO:
+                        /* SCTP Socket API Extension
+                         * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
+                         *
+                         * This cmsghdr structure specifies SCTP options for
+                         * sendmsg(). This structure and SCTP_RCVINFO replaces
+                         * SCTP_SNDRCV which has been deprecated.
+                         *
+                         * cmsg_level    cmsg_type      cmsg_data[]
+                         * ------------  ------------   ---------------------
+                         * IPPROTO_SCTP  SCTP_SNDINFO    struct sctp_sndinfo
+                         */
+                        if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
+                                return -EINVAL;
+
+                        cmsgs->sinfo = CMSG_DATA(cmsg);
+
+                        if (cmsgs->sinfo->snd_flags &
+                            ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
+                              SCTP_ABORT | SCTP_EOF))
+                                return -EINVAL;
+                        break;
                 default:
                         return -EINVAL;
                 }
         }
+
         return 0;
 }
 
@@ -6518,8 +6739,8 @@ out:
  * Note: This is pretty much the same routine as in core/datagram.c
  * with a few changes to make lksctp work.
  */
-static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
-                                              int noblock, int *err)
+struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
+                                       int noblock, int *err)
 {
         int error;
         struct sk_buff *skb;