net: sctp: implement rfc6458, 5.3.5. SCTP_RCVINFO cmsg support
This patch implements section 5.3.5. of RFC6458, that is, support
for 'SCTP Receive Information Structure' (SCTP_RCVINFO) which is
placed into ancillary data cmsghdr structure for each recvmsg()
call.
This option can be enabled/disabled via setsockopt(2) on SOL_SCTP
level by setting an int value with 1/0 for SCTP_RECVRCVINFO in user
space applications as per RFC6458, section 8.1.29.
The sctp_rcvinfo structure is defined as per RFC as below ...
struct sctp_rcvinfo {
uint16_t rcv_sid;
uint16_t rcv_ssn;
uint16_t rcv_flags;
<-- 2 bytes hole -->
uint32_t rcv_ppid;
uint32_t rcv_tsn;
uint32_t rcv_cumtsn;
uint32_t rcv_context;
sctp_assoc_t rcv_assoc_id;
};
... and provided under cmsg_level IPPROTO_SCTP, cmsg_type
SCTP_RCVINFO, while cmsg_data[] contains struct sctp_rcvinfo.
An sctp_rcvinfo item always corresponds to the data in msg_iov.
Joint work with Daniel Borkmann.
Signed-off-by: Geir Ola Vaagland <geirola@gmail.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geir Ola Vaagland
David S. Miller
parent
63b949382c
commit
0d3a421d28
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@ -207,7 +207,9 @@ struct sctp_sock {
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struct sctp_paddrparams paddrparam;
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struct sctp_event_subscribe subscribe;
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struct sctp_assocparams assocparams;
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int user_frag;
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__u32 autoclose;
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__u8 nodelay;
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__u8 disable_fragments;
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@ -215,6 +217,7 @@ struct sctp_sock {
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__u8 frag_interleave;
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__u32 adaptation_ind;
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__u32 pd_point;
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__u8 recvrcvinfo;
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atomic_t pd_mode;
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/* Receive to here while partial delivery is in effect. */
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@ -130,6 +130,9 @@ struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
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void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
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struct msghdr *);
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void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
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struct msghdr *);
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__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event);
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/* Is this event type enabled? */
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@ -95,6 +95,7 @@ typedef __s32 sctp_assoc_t;
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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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#define SCTP_PEER_ADDR_THLDS 31
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#define SCTP_RECVRCVINFO 32
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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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@ -110,8 +111,7 @@ typedef __s32 sctp_assoc_t;
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#define SCTP_SOCKOPT_CONNECTX3 111 /* CONNECTX requests (updated) */
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#define SCTP_GET_ASSOC_STATS 112 /* Read only */
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/*
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* 5.2.1 SCTP Initiation Structure (SCTP_INIT)
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/* 5.3.1 SCTP Initiation Structure (SCTP_INIT)
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*
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* This cmsghdr structure provides information for initializing new
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* SCTP associations with sendmsg(). The SCTP_INITMSG socket option
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@ -121,7 +121,6 @@ typedef __s32 sctp_assoc_t;
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* cmsg_level cmsg_type cmsg_data[]
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* ------------ ------------ ----------------------
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* IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
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*
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*/
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struct sctp_initmsg {
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__u16 sinit_num_ostreams;
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@ -130,8 +129,7 @@ struct sctp_initmsg {
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__u16 sinit_max_init_timeo;
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};
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/*
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* 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
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/* 5.3.2 SCTP Header Information Structure (SCTP_SNDRCV)
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*
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* This cmsghdr structure specifies SCTP options for sendmsg() and
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* describes SCTP header information about a received message through
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@ -140,7 +138,6 @@ struct sctp_initmsg {
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* cmsg_level cmsg_type cmsg_data[]
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* ------------ ------------ ----------------------
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* IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
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*
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*/
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struct sctp_sndrcvinfo {
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__u16 sinfo_stream;
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@ -170,13 +167,32 @@ struct sctp_sndinfo {
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sctp_assoc_t snd_assoc_id;
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};
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/* 5.3.5 SCTP Receive Information Structure (SCTP_RCVINFO)
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*
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* This cmsghdr structure describes SCTP receive information
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* about a received message through recvmsg().
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*
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* cmsg_level cmsg_type cmsg_data[]
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* ------------ ------------ -------------------
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* IPPROTO_SCTP SCTP_RCVINFO struct sctp_rcvinfo
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*/
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struct sctp_rcvinfo {
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__u16 rcv_sid;
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__u16 rcv_ssn;
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__u16 rcv_flags;
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__u32 rcv_ppid;
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__u32 rcv_tsn;
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__u32 rcv_cumtsn;
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__u32 rcv_context;
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sctp_assoc_t rcv_assoc_id;
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};
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/*
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* sinfo_flags: 16 bits (unsigned integer)
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*
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* This field may contain any of the following flags and is composed of
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* a bitwise OR of these values.
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*/
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enum sctp_sinfo_flags {
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SCTP_UNORDERED = 1, /* Send/receive message unordered. */
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SCTP_ADDR_OVER = 2, /* Override the primary destination. */
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@ -199,6 +215,8 @@ typedef enum sctp_cmsg_type {
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#define SCTP_SNDRCV SCTP_SNDRCV
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SCTP_SNDINFO, /* 5.3.4 SCTP Send Information Structure */
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#define SCTP_SNDINFO SCTP_SNDINFO
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SCTP_RCVINFO, /* 5.3.5 SCTP Receive Information Structure */
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#define SCTP_RCVINFO SCTP_RCVINFO
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} sctp_cmsg_t;
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/*
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@ -2112,9 +2112,13 @@ static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
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sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
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}
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/* Check if we allow SCTP_RCVINFO. */
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if (sp->recvrcvinfo)
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sctp_ulpevent_read_rcvinfo(event, msg);
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/* Check if we allow SCTP_SNDRCVINFO. */
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if (sp->subscribe.sctp_data_io_event)
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sctp_ulpevent_read_sndrcvinfo(event, msg);
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#if 0
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/* FIXME: we should be calling IP/IPv6 layers. */
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if (sk->sk_protinfo.af_inet.cmsg_flags)
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@ -3541,7 +3545,6 @@ static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
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return 0;
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}
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/*
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* SCTP_PEER_ADDR_THLDS
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*
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@ -3592,6 +3595,22 @@ static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
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return 0;
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}
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static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
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char __user *optval,
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unsigned int optlen)
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{
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int val;
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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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sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
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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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* Applications use setsockopt() and getsockopt() to set or retrieve
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@ -3743,6 +3762,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
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case SCTP_PEER_ADDR_THLDS:
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retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
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break;
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case SCTP_RECVRCVINFO:
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retval = sctp_setsockopt_recvrcvinfo(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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@ -3989,6 +4011,8 @@ static int sctp_init_sock(struct sock *sk)
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/* Enable Nagle algorithm by default. */
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sp->nodelay = 0;
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sp->recvrcvinfo = 0;
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/* Enable by default. */
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sp->v4mapped = 1;
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@ -5770,6 +5794,26 @@ static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
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return 0;
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}
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static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
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char __user *optval,
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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)->recvrcvinfo)
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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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static int sctp_getsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int __user *optlen)
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{
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@ -5913,6 +5957,9 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname,
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case SCTP_GET_ASSOC_STATS:
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retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
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break;
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case SCTP_RECVRCVINFO:
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retval = sctp_getsockopt_recvrcvinfo(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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@ -886,6 +886,31 @@ void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
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sizeof(sinfo), &sinfo);
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}
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/* RFC6458, Section 5.3.5 SCTP Receive Information Structure
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* (SCTP_SNDRCV)
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*/
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void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
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struct msghdr *msghdr)
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{
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struct sctp_rcvinfo rinfo;
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if (sctp_ulpevent_is_notification(event))
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return;
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memset(&rinfo, 0, sizeof(struct sctp_rcvinfo));
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rinfo.rcv_sid = event->stream;
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rinfo.rcv_ssn = event->ssn;
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rinfo.rcv_ppid = event->ppid;
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rinfo.rcv_flags = event->flags;
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rinfo.rcv_tsn = event->tsn;
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rinfo.rcv_cumtsn = event->cumtsn;
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rinfo.rcv_assoc_id = sctp_assoc2id(event->asoc);
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rinfo.rcv_context = event->asoc->default_rcv_context;
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put_cmsg(msghdr, IPPROTO_SCTP, SCTP_RCVINFO,
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sizeof(rinfo), &rinfo);
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}
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/* Do accounting for bytes received and hold a reference to the association
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* for each skb.
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*/
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