/**
* Fill in the msg ancillary data buffer with all control messages
* according to cmsg_flags the user has set beforehand.
*/
void ci_ip_cmsg_recv(ci_netif* ni, ci_udp_state* us, const ci_ip_pkt_fmt *pkt,
struct msghdr *msg, int netif_locked)
{
unsigned flags = us->s.cmsg_flags;
struct cmsg_state cmsg_state;
cmsg_state.msg = msg;
cmsg_state.cmsg_bytes_used = 0;
cmsg_state.cm = CMSG_FIRSTHDR(msg);
if( pkt->flags & CI_PKT_FLAG_RX_INDIRECT )
pkt = PKT_CHK_NML(ni, pkt->frag_next, netif_locked);
if (flags & CI_IP_CMSG_PKTINFO) {
++us->stats.n_rx_pktinfo;
ip_cmsg_recv_pktinfo(ni, pkt, &cmsg_state);
}
if (flags & CI_IP_CMSG_TTL)
ip_cmsg_recv_ttl(pkt, &cmsg_state);
if (flags & CI_IP_CMSG_TOS)
ip_cmsg_recv_tos(pkt, &cmsg_state);
if( flags & CI_IP_CMSG_TIMESTAMPNS )
ip_cmsg_recv_timestampns(ni, pkt->pf.udp.rx_stamp, &cmsg_state);
else /* SO_TIMESTAMP gets ignored when SO_TIMESTAMPNS one is set */
if( flags & CI_IP_CMSG_TIMESTAMP )
ip_cmsg_recv_timestamp(ni, pkt->pf.udp.rx_stamp, &cmsg_state);
if( flags & CI_IP_CMSG_TIMESTAMPING ) {
int flags = us->s.timestamping_flags;
if( flags & (ONLOAD_SOF_TIMESTAMPING_RAW_HARDWARE
| ONLOAD_SOF_TIMESTAMPING_SYS_HARDWARE
| ONLOAD_SOF_TIMESTAMPING_SOFTWARE) ) {
struct timespec rx_hw_stamp;
rx_hw_stamp.tv_sec = pkt->pf.udp.rx_hw_stamp.tv_sec;
rx_hw_stamp.tv_nsec = pkt->pf.udp.rx_hw_stamp.tv_nsec;
if( ! (rx_hw_stamp.tv_nsec & CI_IP_PKT_HW_STAMP_FLAG_IN_SYNC) )
flags &= ~ONLOAD_SOF_TIMESTAMPING_SYS_HARDWARE;
ip_cmsg_recv_timestamping(ni, pkt->pf.udp.rx_stamp, &rx_hw_stamp,
flags, &cmsg_state);
}
}
ci_ip_cmsg_finish(&cmsg_state);
}
static int ci_udp_recvmsg_socklocked_slowpath(ci_udp_iomsg_args* a,
ci_msghdr* msg,
ci_iovec_ptr *piov, int flags)
{
int rc = 0;
ci_netif* ni = a->ni;
ci_udp_state* us = a->us;
if(CI_UNLIKELY( ni->state->rxq_low ))
ci_netif_rxq_low_on_recv(ni, &us->s,
1 /* assume at least one pkt freed */);
/* In the kernel recv() with flags is not called.
* only read(). So flags may only contain MSG_DONTWAIT */
#ifdef __KERNEL__
ci_assert_equal(flags, 0);
#endif
#ifndef __KERNEL__
if( flags & MSG_ERRQUEUE_CHK ) {
if( OO_PP_NOT_NULL(us->timestamp_q.extract) ) {
ci_ip_pkt_fmt* pkt;
struct timespec ts[3];
struct cmsg_state cmsg_state;
ci_udp_hdr* udp;
int paylen;
/* TODO is this necessary? - mirroring ci_udp_recvmsg_get() */
ci_rmb();
pkt = PKT_CHK_NNL(ni, us->timestamp_q.extract);
if( pkt->tx_hw_stamp.tv_sec == CI_PKT_TX_HW_STAMP_CONSUMED ) {
if( OO_PP_IS_NULL(pkt->tsq_next) )
goto errqueue_empty;
us->timestamp_q.extract = pkt->tsq_next;
pkt = PKT_CHK_NNL(ni, us->timestamp_q.extract);
ci_assert(pkt->tx_hw_stamp.tv_sec != CI_PKT_TX_HW_STAMP_CONSUMED);
}
udp = oo_ip_data(pkt);
paylen = CI_BSWAP_BE16(oo_ip_hdr(pkt)->ip_tot_len_be16) -
sizeof(ci_ip4_hdr) - sizeof(udp);
msg->msg_flags = 0;
cmsg_state.msg = msg;
cmsg_state.cm = msg->msg_control;
cmsg_state.cmsg_bytes_used = 0;
ci_iovec_ptr_init_nz(piov, msg->msg_iov, msg->msg_iovlen);
memset(ts, 0, sizeof(ts));
if( us->s.timestamping_flags & ONLOAD_SOF_TIMESTAMPING_RAW_HARDWARE ) {
ts[2].tv_sec = pkt->tx_hw_stamp.tv_sec;
ts[2].tv_nsec = pkt->tx_hw_stamp.tv_nsec;
}
if( (us->s.timestamping_flags & ONLOAD_SOF_TIMESTAMPING_SYS_HARDWARE) &&
(pkt->tx_hw_stamp.tv_nsec & CI_IP_PKT_HW_STAMP_FLAG_IN_SYNC) ) {
ts[1].tv_sec = pkt->tx_hw_stamp.tv_sec;
ts[1].tv_nsec = pkt->tx_hw_stamp.tv_nsec;
}
ci_put_cmsg(&cmsg_state, SOL_SOCKET, ONLOAD_SCM_TIMESTAMPING,
sizeof(ts), &ts);
oo_offbuf_set_start(&pkt->buf, udp + 1);
oo_offbuf_set_len(&pkt->buf, paylen);
rc = oo_copy_pkt_to_iovec_no_adv(ni, pkt, piov, paylen);
/* Mark this packet/timestamp as consumed */
pkt->tx_hw_stamp.tv_sec = CI_PKT_TX_HW_STAMP_CONSUMED;
ci_ip_cmsg_finish(&cmsg_state);
msg->msg_flags |= MSG_ERRQUEUE_CHK;
return rc;
}
errqueue_empty:
/* ICMP is handled via OS, so get OS error */
rc = oo_os_sock_recvmsg(ni, SC_SP(&us->s), msg, flags);
if( rc < 0 ) {
ci_assert(-rc == errno);
return -1;
}
else
return rc;
}
#endif
if( (rc = ci_get_so_error(&us->s)) != 0 ) {
CI_SET_ERROR(rc, rc);
return rc;
}
if( msg->msg_iovlen > 0 && msg->msg_iov == NULL ) {
CI_SET_ERROR(rc, EFAULT);
return rc;
}
#if MSG_OOB_CHK
if( flags & MSG_OOB_CHK ) {
CI_SET_ERROR(rc, EOPNOTSUPP);
return rc;
}
#endif
#if CI_CFG_POSIX_RECV
if( ! udp_lport_be16(us)) {
LOG_UV(log("%s: -1 (ENOTCONN)", __FUNCTION__));
CI_SET_ERROR(rc, ENOTCONN);
return rc;
}
#endif
if( msg->msg_iovlen == 0 ) {
/* We have a difference in behaviour from the Linux stack here. When
** msg_iovlen is 0 Linux 2.4.21-15.EL does not set MSG_TRUNC when a
** datagram has non-zero length. We do. */
CI_IOVEC_LEN(&piov->io) = piov->iovlen = 0;
return IOVLEN_WORKAROUND_RC_VALUE;
}
return 0;
}
