1190 lines
31 KiB
C
1190 lines
31 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 2011-2016 Universita` di Pisa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* $FreeBSD$
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*
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* Functions and macros to manipulate netmap structures and packets
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* in userspace. See netmap(4) for more information.
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*
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* The address of the struct netmap_if, say nifp, is computed from the
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* value returned from ioctl(.., NIOCREG, ...) and the mmap region:
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* ioctl(fd, NIOCREG, &req);
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* mem = mmap(0, ... );
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* nifp = NETMAP_IF(mem, req.nr_nifp);
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* (so simple, we could just do it manually)
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*
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* From there:
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* struct netmap_ring *NETMAP_TXRING(nifp, index)
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* struct netmap_ring *NETMAP_RXRING(nifp, index)
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* we can access ring->cur, ring->head, ring->tail, etc.
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*
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* ring->slot[i] gives us the i-th slot (we can access
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* directly len, flags, buf_idx)
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*
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* char *buf = NETMAP_BUF(ring, x) returns a pointer to
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* the buffer numbered x
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*
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* All ring indexes (head, cur, tail) should always move forward.
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* To compute the next index in a circular ring you can use
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* i = nm_ring_next(ring, i);
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*
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* To ease porting apps from pcap to netmap we supply a few functions
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* that can be called to open, close, read and write on netmap in a way
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* similar to libpcap. Note that the read/write function depend on
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* an ioctl()/select()/poll() being issued to refill rings or push
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* packets out.
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*
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* In order to use these, include #define NETMAP_WITH_LIBS
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* in the source file that invokes these functions.
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*/
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#ifndef _NET_NETMAP_USER_H_
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#define _NET_NETMAP_USER_H_
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#define NETMAP_DEVICE_NAME "/dev/netmap"
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#ifdef __CYGWIN__
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/*
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* we can compile userspace apps with either cygwin or msvc,
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* and we use _WIN32 to identify windows specific code
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*/
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#ifndef _WIN32
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#define _WIN32
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#endif /* _WIN32 */
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#endif /* __CYGWIN__ */
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#ifdef _WIN32
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#undef NETMAP_DEVICE_NAME
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#define NETMAP_DEVICE_NAME "/proc/sys/DosDevices/Global/netmap"
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#include <windows.h>
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#include <WinDef.h>
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#include <sys/cygwin.h>
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#endif /* _WIN32 */
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#include <stdint.h>
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#include <sys/socket.h> /* apple needs sockaddr */
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#include <net/if.h> /* IFNAMSIZ */
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#include <ctype.h>
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#include <string.h> /* memset */
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#include <sys/time.h> /* gettimeofday */
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#ifndef likely
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#define likely(x) __builtin_expect(!!(x), 1)
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#endif /* likely and unlikely */
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#include <net/netmap.h>
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/* helper macro */
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#define _NETMAP_OFFSET(type, ptr, offset) \
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((type)(void *)((char *)(ptr) + (offset)))
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#define NETMAP_IF(_base, _ofs) _NETMAP_OFFSET(struct netmap_if *, _base, _ofs)
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#define NETMAP_TXRING(nifp, index) _NETMAP_OFFSET(struct netmap_ring *, \
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nifp, (nifp)->ring_ofs[index] )
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#define NETMAP_RXRING(nifp, index) _NETMAP_OFFSET(struct netmap_ring *, \
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nifp, (nifp)->ring_ofs[index + (nifp)->ni_tx_rings + \
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(nifp)->ni_host_tx_rings] )
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#define NETMAP_BUF(ring, index) \
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((char *)(ring) + (ring)->buf_ofs + ((size_t)(index)*(ring)->nr_buf_size))
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#define NETMAP_BUF_IDX(ring, buf) \
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( ((char *)(buf) - ((char *)(ring) + (ring)->buf_ofs) ) / \
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(ring)->nr_buf_size )
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/* read the offset field in a ring's slot */
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#define NETMAP_ROFFSET(ring, slot) \
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((slot)->ptr & (ring)->offset_mask)
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/* update the offset field in a ring's slot */
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#define NETMAP_WOFFSET(ring, slot, offset) \
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do { (slot)->ptr = ((slot)->ptr & ~(ring)->offset_mask) | \
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((offset) & (ring)->offset_mask); } while (0)
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/* obtain the start of the buffer pointed to by a ring's slot, taking the
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* offset field into account
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*/
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#define NETMAP_BUF_OFFSET(ring, slot) \
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(NETMAP_BUF(ring, (slot)->buf_idx) + NETMAP_ROFFSET(ring, slot))
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static inline uint32_t
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nm_ring_next(struct netmap_ring *r, uint32_t i)
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{
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return ( unlikely(i + 1 == r->num_slots) ? 0 : i + 1);
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}
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/*
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* Return 1 if we have pending transmissions in the tx ring.
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* When everything is complete ring->head = ring->tail + 1 (modulo ring size)
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*/
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static inline int
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nm_tx_pending(struct netmap_ring *r)
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{
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return nm_ring_next(r, r->tail) != r->head;
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}
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/* Compute the number of slots available in the netmap ring. We use
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* ring->head as explained in the comment above nm_ring_empty(). */
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static inline uint32_t
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nm_ring_space(struct netmap_ring *ring)
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{
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int ret = ring->tail - ring->head;
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if (ret < 0)
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ret += ring->num_slots;
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return ret;
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}
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#ifndef ND /* debug macros */
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/* debug support */
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#define ND(_fmt, ...) do {} while(0)
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#define D(_fmt, ...) \
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do { \
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struct timeval _t0; \
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gettimeofday(&_t0, NULL); \
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fprintf(stderr, "%03d.%06d %s [%d] " _fmt "\n", \
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(int)(_t0.tv_sec % 1000), (int)_t0.tv_usec, \
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__FUNCTION__, __LINE__, ##__VA_ARGS__); \
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} while (0)
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/* Rate limited version of "D", lps indicates how many per second */
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#define RD(lps, format, ...) \
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do { \
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static int __t0, __cnt; \
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struct timeval __xxts; \
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gettimeofday(&__xxts, NULL); \
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if (__t0 != __xxts.tv_sec) { \
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__t0 = __xxts.tv_sec; \
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__cnt = 0; \
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} \
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if (__cnt++ < lps) { \
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D(format, ##__VA_ARGS__); \
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} \
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} while (0)
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#endif
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/*
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* this is a slightly optimized copy routine which rounds
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* to multiple of 64 bytes and is often faster than dealing
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* with other odd sizes. We assume there is enough room
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* in the source and destination buffers.
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*/
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static inline void
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nm_pkt_copy(const void *_src, void *_dst, int l)
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{
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const uint64_t *src = (const uint64_t *)_src;
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uint64_t *dst = (uint64_t *)_dst;
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if (unlikely(l >= 1024 || l % 64)) {
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memcpy(dst, src, l);
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return;
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}
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for (; likely(l > 0); l-=64) {
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*dst++ = *src++;
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*dst++ = *src++;
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*dst++ = *src++;
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*dst++ = *src++;
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*dst++ = *src++;
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*dst++ = *src++;
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*dst++ = *src++;
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*dst++ = *src++;
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}
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}
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#ifdef NETMAP_WITH_LIBS
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/*
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* Support for simple I/O libraries.
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* Include other system headers required for compiling this.
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*/
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#ifndef HAVE_NETMAP_WITH_LIBS
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#define HAVE_NETMAP_WITH_LIBS
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#include <stdio.h>
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#include <sys/time.h>
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#include <sys/mman.h>
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#include <sys/ioctl.h>
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#include <sys/errno.h> /* EINVAL */
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#include <fcntl.h> /* O_RDWR */
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#include <unistd.h> /* close() */
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#include <signal.h>
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#include <stdlib.h>
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struct nm_pkthdr { /* first part is the same as pcap_pkthdr */
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struct timeval ts;
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uint32_t caplen;
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uint32_t len;
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uint64_t flags; /* NM_MORE_PKTS etc */
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#define NM_MORE_PKTS 1
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struct nm_desc *d;
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struct netmap_slot *slot;
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uint8_t *buf;
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};
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struct nm_stat { /* same as pcap_stat */
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u_int ps_recv;
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u_int ps_drop;
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u_int ps_ifdrop;
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#ifdef WIN32 /* XXX or _WIN32 ? */
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u_int bs_capt;
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#endif /* WIN32 */
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};
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#define NM_ERRBUF_SIZE 512
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struct nm_desc {
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struct nm_desc *self; /* point to self if netmap. */
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int fd;
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void *mem;
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size_t memsize;
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int done_mmap; /* set if mem is the result of mmap */
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struct netmap_if * const nifp;
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uint16_t first_tx_ring, last_tx_ring, cur_tx_ring;
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uint16_t first_rx_ring, last_rx_ring, cur_rx_ring;
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struct nmreq req; /* also contains the nr_name = ifname */
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struct nm_pkthdr hdr;
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/*
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* The memory contains netmap_if, rings and then buffers.
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* Given a pointer (e.g. to nm_inject) we can compare with
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* mem/buf_start/buf_end to tell if it is a buffer or
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* some other descriptor in our region.
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* We also store a pointer to some ring as it helps in the
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* translation from buffer indexes to addresses.
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*/
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struct netmap_ring * const some_ring;
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void * const buf_start;
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void * const buf_end;
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/* parameters from pcap_open_live */
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int snaplen;
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int promisc;
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int to_ms;
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char *errbuf;
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/* save flags so we can restore them on close */
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uint32_t if_flags;
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uint32_t if_reqcap;
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uint32_t if_curcap;
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struct nm_stat st;
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char msg[NM_ERRBUF_SIZE];
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};
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/*
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* when the descriptor is open correctly, d->self == d
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* Eventually we should also use some magic number.
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*/
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#define P2NMD(p) ((const struct nm_desc *)(p))
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#define IS_NETMAP_DESC(d) ((d) && P2NMD(d)->self == P2NMD(d))
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#define NETMAP_FD(d) (P2NMD(d)->fd)
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/*
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* The callback, invoked on each received packet. Same as libpcap
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*/
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typedef void (*nm_cb_t)(u_char *, const struct nm_pkthdr *, const u_char *d);
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/*
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*--- the pcap-like API ---
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*
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* nm_open() opens a file descriptor, binds to a port and maps memory.
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*
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* ifname (netmap:foo or vale:foo) is the port name
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* a suffix can indicate the following:
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* ^ bind the host (sw) ring pair
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* * bind host and NIC ring pairs
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* -NN bind individual NIC ring pair
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* {NN bind master side of pipe NN
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* }NN bind slave side of pipe NN
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* a suffix starting with / and the following flags,
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* in any order:
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* x exclusive access
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* z zero copy monitor (both tx and rx)
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* t monitor tx side (copy monitor)
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* r monitor rx side (copy monitor)
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* R bind only RX ring(s)
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* T bind only TX ring(s)
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*
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* req provides the initial values of nmreq before parsing ifname.
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* Remember that the ifname parsing will override the ring
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* number in nm_ringid, and part of nm_flags;
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* flags special functions, normally 0
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* indicates which fields of *arg are significant
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* arg special functions, normally NULL
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* if passed a netmap_desc with mem != NULL,
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* use that memory instead of mmap.
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*/
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static struct nm_desc *nm_open(const char *ifname, const struct nmreq *req,
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uint64_t flags, const struct nm_desc *arg);
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/*
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* nm_open can import some fields from the parent descriptor.
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* These flags control which ones.
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* Also in flags you can specify NETMAP_NO_TX_POLL and NETMAP_DO_RX_POLL,
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* which set the initial value for these flags.
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* Note that the 16 low bits of the flags are reserved for data
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* that may go into the nmreq.
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*/
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enum {
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NM_OPEN_NO_MMAP = 0x040000, /* reuse mmap from parent */
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NM_OPEN_IFNAME = 0x080000, /* nr_name, nr_ringid, nr_flags */
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NM_OPEN_ARG1 = 0x100000,
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NM_OPEN_ARG2 = 0x200000,
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NM_OPEN_ARG3 = 0x400000,
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NM_OPEN_RING_CFG = 0x800000, /* tx|rx rings|slots */
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};
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/*
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* nm_close() closes and restores the port to its previous state
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*/
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static int nm_close(struct nm_desc *);
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/*
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* nm_mmap() do mmap or inherit from parent if the nr_arg2
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* (memory block) matches.
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*/
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static int nm_mmap(struct nm_desc *, const struct nm_desc *);
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/*
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* nm_inject() is the same as pcap_inject()
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* nm_dispatch() is the same as pcap_dispatch()
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* nm_nextpkt() is the same as pcap_next()
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*/
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static int nm_inject(struct nm_desc *, const void *, size_t);
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static int nm_dispatch(struct nm_desc *, int, nm_cb_t, u_char *);
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static u_char *nm_nextpkt(struct nm_desc *, struct nm_pkthdr *);
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#ifdef _WIN32
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intptr_t _get_osfhandle(int); /* defined in io.h in windows */
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/*
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* In windows we do not have yet native poll support, so we keep track
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* of file descriptors associated to netmap ports to emulate poll on
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* them and fall back on regular poll on other file descriptors.
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*/
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struct win_netmap_fd_list {
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struct win_netmap_fd_list *next;
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int win_netmap_fd;
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HANDLE win_netmap_handle;
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};
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/*
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* list head containing all the netmap opened fd and their
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* windows HANDLE counterparts
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*/
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static struct win_netmap_fd_list *win_netmap_fd_list_head;
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static void
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win_insert_fd_record(int fd)
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{
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struct win_netmap_fd_list *curr;
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for (curr = win_netmap_fd_list_head; curr; curr = curr->next) {
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if (fd == curr->win_netmap_fd) {
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return;
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}
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}
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curr = calloc(1, sizeof(*curr));
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curr->next = win_netmap_fd_list_head;
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curr->win_netmap_fd = fd;
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curr->win_netmap_handle = IntToPtr(_get_osfhandle(fd));
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win_netmap_fd_list_head = curr;
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}
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void
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win_remove_fd_record(int fd)
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{
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struct win_netmap_fd_list *curr = win_netmap_fd_list_head;
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struct win_netmap_fd_list *prev = NULL;
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for (; curr ; prev = curr, curr = curr->next) {
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if (fd != curr->win_netmap_fd)
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continue;
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/* found the entry */
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if (prev == NULL) { /* we are freeing the first entry */
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win_netmap_fd_list_head = curr->next;
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} else {
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prev->next = curr->next;
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}
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free(curr);
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break;
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}
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}
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HANDLE
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win_get_netmap_handle(int fd)
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{
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struct win_netmap_fd_list *curr;
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for (curr = win_netmap_fd_list_head; curr; curr = curr->next) {
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if (fd == curr->win_netmap_fd) {
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return curr->win_netmap_handle;
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}
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}
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return NULL;
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}
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/*
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* we need to wrap ioctl and mmap, at least for the netmap file descriptors
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*/
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/*
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* use this function only from netmap_user.h internal functions
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* same as ioctl, returns 0 on success and -1 on error
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*/
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static int
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win_nm_ioctl_internal(HANDLE h, int32_t ctlCode, void *arg)
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{
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DWORD bReturn = 0, szIn, szOut;
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BOOL ioctlReturnStatus;
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void *inParam = arg, *outParam = arg;
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switch (ctlCode) {
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case NETMAP_POLL:
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szIn = sizeof(POLL_REQUEST_DATA);
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szOut = sizeof(POLL_REQUEST_DATA);
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break;
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case NETMAP_MMAP:
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szIn = 0;
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szOut = sizeof(void*);
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inParam = NULL; /* nothing on input */
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break;
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case NIOCTXSYNC:
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case NIOCRXSYNC:
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szIn = 0;
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szOut = 0;
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break;
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case NIOCREGIF:
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szIn = sizeof(struct nmreq);
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szOut = sizeof(struct nmreq);
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break;
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case NIOCCONFIG:
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D("unsupported NIOCCONFIG!");
|
|
return -1;
|
|
|
|
default: /* a regular ioctl */
|
|
D("invalid ioctl %x on netmap fd", ctlCode);
|
|
return -1;
|
|
}
|
|
|
|
ioctlReturnStatus = DeviceIoControl(h,
|
|
ctlCode, inParam, szIn,
|
|
outParam, szOut,
|
|
&bReturn, NULL);
|
|
// XXX note windows returns 0 on error or async call, 1 on success
|
|
// we could call GetLastError() to figure out what happened
|
|
return ioctlReturnStatus ? 0 : -1;
|
|
}
|
|
|
|
/*
|
|
* this function is what must be called from user-space programs
|
|
* same as ioctl, returns 0 on success and -1 on error
|
|
*/
|
|
static int
|
|
win_nm_ioctl(int fd, int32_t ctlCode, void *arg)
|
|
{
|
|
HANDLE h = win_get_netmap_handle(fd);
|
|
|
|
if (h == NULL) {
|
|
return ioctl(fd, ctlCode, arg);
|
|
} else {
|
|
return win_nm_ioctl_internal(h, ctlCode, arg);
|
|
}
|
|
}
|
|
|
|
#define ioctl win_nm_ioctl /* from now on, within this file ... */
|
|
|
|
/*
|
|
* We cannot use the native mmap on windows
|
|
* The only parameter used is "fd", the other ones are just declared to
|
|
* make this signature comparable to the FreeBSD/Linux one
|
|
*/
|
|
static void *
|
|
win32_mmap_emulated(void *addr, size_t length, int prot, int flags, int fd, int32_t offset)
|
|
{
|
|
HANDLE h = win_get_netmap_handle(fd);
|
|
|
|
if (h == NULL) {
|
|
return mmap(addr, length, prot, flags, fd, offset);
|
|
} else {
|
|
MEMORY_ENTRY ret;
|
|
|
|
return win_nm_ioctl_internal(h, NETMAP_MMAP, &ret) ?
|
|
NULL : ret.pUsermodeVirtualAddress;
|
|
}
|
|
}
|
|
|
|
#define mmap win32_mmap_emulated
|
|
|
|
#include <sys/poll.h> /* XXX needed to use the structure pollfd */
|
|
|
|
static int
|
|
win_nm_poll(struct pollfd *fds, int nfds, int timeout)
|
|
{
|
|
HANDLE h;
|
|
|
|
if (nfds != 1 || fds == NULL || (h = win_get_netmap_handle(fds->fd)) == NULL) {;
|
|
return poll(fds, nfds, timeout);
|
|
} else {
|
|
POLL_REQUEST_DATA prd;
|
|
|
|
prd.timeout = timeout;
|
|
prd.events = fds->events;
|
|
|
|
win_nm_ioctl_internal(h, NETMAP_POLL, &prd);
|
|
if ((prd.revents == POLLERR) || (prd.revents == STATUS_TIMEOUT)) {
|
|
return -1;
|
|
}
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
#define poll win_nm_poll
|
|
|
|
static int
|
|
win_nm_open(char* pathname, int flags)
|
|
{
|
|
|
|
if (strcmp(pathname, NETMAP_DEVICE_NAME) == 0) {
|
|
int fd = open(NETMAP_DEVICE_NAME, O_RDWR);
|
|
if (fd < 0) {
|
|
return -1;
|
|
}
|
|
|
|
win_insert_fd_record(fd);
|
|
return fd;
|
|
} else {
|
|
return open(pathname, flags);
|
|
}
|
|
}
|
|
|
|
#define open win_nm_open
|
|
|
|
static int
|
|
win_nm_close(int fd)
|
|
{
|
|
if (fd != -1) {
|
|
close(fd);
|
|
if (win_get_netmap_handle(fd) != NULL) {
|
|
win_remove_fd_record(fd);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#define close win_nm_close
|
|
|
|
#endif /* _WIN32 */
|
|
|
|
static int
|
|
nm_is_identifier(const char *s, const char *e)
|
|
{
|
|
for (; s != e; s++) {
|
|
if (!isalnum(*s) && *s != '_') {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
#define MAXERRMSG 80
|
|
static int
|
|
nm_parse(const char *ifname, struct nm_desc *d, char *err)
|
|
{
|
|
int is_vale;
|
|
const char *port = NULL;
|
|
const char *vpname = NULL;
|
|
u_int namelen;
|
|
uint32_t nr_ringid = 0, nr_flags;
|
|
char errmsg[MAXERRMSG] = "", *tmp;
|
|
long num;
|
|
uint16_t nr_arg2 = 0;
|
|
enum { P_START, P_RNGSFXOK, P_GETNUM, P_FLAGS, P_FLAGSOK, P_MEMID } p_state;
|
|
|
|
errno = 0;
|
|
|
|
is_vale = (ifname[0] == 'v');
|
|
if (is_vale) {
|
|
port = index(ifname, ':');
|
|
if (port == NULL) {
|
|
snprintf(errmsg, MAXERRMSG,
|
|
"missing ':' in vale name");
|
|
goto fail;
|
|
}
|
|
|
|
if (!nm_is_identifier(ifname + 4, port)) {
|
|
snprintf(errmsg, MAXERRMSG, "invalid bridge name");
|
|
goto fail;
|
|
}
|
|
|
|
vpname = ++port;
|
|
} else {
|
|
ifname += 7;
|
|
port = ifname;
|
|
}
|
|
|
|
/* scan for a separator */
|
|
for (; *port && !index("-*^{}/@", *port); port++)
|
|
;
|
|
|
|
if (is_vale && !nm_is_identifier(vpname, port)) {
|
|
snprintf(errmsg, MAXERRMSG, "invalid bridge port name");
|
|
goto fail;
|
|
}
|
|
|
|
namelen = port - ifname;
|
|
if (namelen >= sizeof(d->req.nr_name)) {
|
|
snprintf(errmsg, MAXERRMSG, "name too long");
|
|
goto fail;
|
|
}
|
|
memcpy(d->req.nr_name, ifname, namelen);
|
|
d->req.nr_name[namelen] = '\0';
|
|
|
|
p_state = P_START;
|
|
nr_flags = NR_REG_ALL_NIC; /* default for no suffix */
|
|
while (*port) {
|
|
switch (p_state) {
|
|
case P_START:
|
|
switch (*port) {
|
|
case '^': /* only SW ring */
|
|
nr_flags = NR_REG_SW;
|
|
p_state = P_RNGSFXOK;
|
|
break;
|
|
case '*': /* NIC and SW */
|
|
nr_flags = NR_REG_NIC_SW;
|
|
p_state = P_RNGSFXOK;
|
|
break;
|
|
case '-': /* one NIC ring pair */
|
|
nr_flags = NR_REG_ONE_NIC;
|
|
p_state = P_GETNUM;
|
|
break;
|
|
case '{': /* pipe (master endpoint) */
|
|
nr_flags = NR_REG_PIPE_MASTER;
|
|
p_state = P_GETNUM;
|
|
break;
|
|
case '}': /* pipe (slave endpoint) */
|
|
nr_flags = NR_REG_PIPE_SLAVE;
|
|
p_state = P_GETNUM;
|
|
break;
|
|
case '/': /* start of flags */
|
|
p_state = P_FLAGS;
|
|
break;
|
|
case '@': /* start of memid */
|
|
p_state = P_MEMID;
|
|
break;
|
|
default:
|
|
snprintf(errmsg, MAXERRMSG, "unknown modifier: '%c'", *port);
|
|
goto fail;
|
|
}
|
|
port++;
|
|
break;
|
|
case P_RNGSFXOK:
|
|
switch (*port) {
|
|
case '/':
|
|
p_state = P_FLAGS;
|
|
break;
|
|
case '@':
|
|
p_state = P_MEMID;
|
|
break;
|
|
default:
|
|
snprintf(errmsg, MAXERRMSG, "unexpected character: '%c'", *port);
|
|
goto fail;
|
|
}
|
|
port++;
|
|
break;
|
|
case P_GETNUM:
|
|
num = strtol(port, &tmp, 10);
|
|
if (num < 0 || num >= NETMAP_RING_MASK) {
|
|
snprintf(errmsg, MAXERRMSG, "'%ld' out of range [0, %d)",
|
|
num, NETMAP_RING_MASK);
|
|
goto fail;
|
|
}
|
|
port = tmp;
|
|
nr_ringid = num & NETMAP_RING_MASK;
|
|
p_state = P_RNGSFXOK;
|
|
break;
|
|
case P_FLAGS:
|
|
case P_FLAGSOK:
|
|
if (*port == '@') {
|
|
port++;
|
|
p_state = P_MEMID;
|
|
break;
|
|
}
|
|
switch (*port) {
|
|
case 'x':
|
|
nr_flags |= NR_EXCLUSIVE;
|
|
break;
|
|
case 'z':
|
|
nr_flags |= NR_ZCOPY_MON;
|
|
break;
|
|
case 't':
|
|
nr_flags |= NR_MONITOR_TX;
|
|
break;
|
|
case 'r':
|
|
nr_flags |= NR_MONITOR_RX;
|
|
break;
|
|
case 'R':
|
|
nr_flags |= NR_RX_RINGS_ONLY;
|
|
break;
|
|
case 'T':
|
|
nr_flags |= NR_TX_RINGS_ONLY;
|
|
break;
|
|
default:
|
|
snprintf(errmsg, MAXERRMSG, "unrecognized flag: '%c'", *port);
|
|
goto fail;
|
|
}
|
|
port++;
|
|
p_state = P_FLAGSOK;
|
|
break;
|
|
case P_MEMID:
|
|
if (nr_arg2 != 0) {
|
|
snprintf(errmsg, MAXERRMSG, "double setting of memid");
|
|
goto fail;
|
|
}
|
|
num = strtol(port, &tmp, 10);
|
|
if (num <= 0) {
|
|
snprintf(errmsg, MAXERRMSG, "invalid memid %ld, must be >0", num);
|
|
goto fail;
|
|
}
|
|
port = tmp;
|
|
nr_arg2 = num;
|
|
p_state = P_RNGSFXOK;
|
|
break;
|
|
}
|
|
}
|
|
if (p_state != P_START && p_state != P_RNGSFXOK && p_state != P_FLAGSOK) {
|
|
snprintf(errmsg, MAXERRMSG, "unexpected end of port name");
|
|
goto fail;
|
|
}
|
|
ND("flags: %s %s %s %s",
|
|
(nr_flags & NR_EXCLUSIVE) ? "EXCLUSIVE" : "",
|
|
(nr_flags & NR_ZCOPY_MON) ? "ZCOPY_MON" : "",
|
|
(nr_flags & NR_MONITOR_TX) ? "MONITOR_TX" : "",
|
|
(nr_flags & NR_MONITOR_RX) ? "MONITOR_RX" : "");
|
|
|
|
d->req.nr_flags |= nr_flags;
|
|
d->req.nr_ringid |= nr_ringid;
|
|
d->req.nr_arg2 = nr_arg2;
|
|
|
|
d->self = d;
|
|
|
|
return 0;
|
|
fail:
|
|
if (!errno)
|
|
errno = EINVAL;
|
|
if (err)
|
|
strncpy(err, errmsg, MAXERRMSG);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Try to open, return descriptor if successful, NULL otherwise.
|
|
* An invalid netmap name will return errno = 0;
|
|
* You can pass a pointer to a pre-filled nm_desc to add special
|
|
* parameters. Flags is used as follows
|
|
* NM_OPEN_NO_MMAP use the memory from arg, only XXX avoid mmap
|
|
* if the nr_arg2 (memory block) matches.
|
|
* NM_OPEN_ARG1 use req.nr_arg1 from arg
|
|
* NM_OPEN_ARG2 use req.nr_arg2 from arg
|
|
* NM_OPEN_RING_CFG user ring config from arg
|
|
*/
|
|
static struct nm_desc *
|
|
nm_open(const char *ifname, const struct nmreq *req,
|
|
uint64_t new_flags, const struct nm_desc *arg)
|
|
{
|
|
struct nm_desc *d = NULL;
|
|
const struct nm_desc *parent = arg;
|
|
char errmsg[MAXERRMSG] = "";
|
|
uint32_t nr_reg;
|
|
|
|
if (strncmp(ifname, "netmap:", 7) &&
|
|
strncmp(ifname, NM_BDG_NAME, strlen(NM_BDG_NAME))) {
|
|
errno = 0; /* name not recognised, not an error */
|
|
return NULL;
|
|
}
|
|
|
|
d = (struct nm_desc *)calloc(1, sizeof(*d));
|
|
if (d == NULL) {
|
|
snprintf(errmsg, MAXERRMSG, "nm_desc alloc failure");
|
|
errno = ENOMEM;
|
|
return NULL;
|
|
}
|
|
d->self = d; /* set this early so nm_close() works */
|
|
d->fd = open(NETMAP_DEVICE_NAME, O_RDWR);
|
|
if (d->fd < 0) {
|
|
snprintf(errmsg, MAXERRMSG, "cannot open /dev/netmap: %s", strerror(errno));
|
|
goto fail;
|
|
}
|
|
|
|
if (req)
|
|
d->req = *req;
|
|
|
|
if (!(new_flags & NM_OPEN_IFNAME)) {
|
|
if (nm_parse(ifname, d, errmsg) < 0)
|
|
goto fail;
|
|
}
|
|
|
|
d->req.nr_version = NETMAP_API;
|
|
d->req.nr_ringid &= NETMAP_RING_MASK;
|
|
|
|
/* optionally import info from parent */
|
|
if (IS_NETMAP_DESC(parent) && new_flags) {
|
|
if (new_flags & NM_OPEN_ARG1)
|
|
D("overriding ARG1 %d", parent->req.nr_arg1);
|
|
d->req.nr_arg1 = new_flags & NM_OPEN_ARG1 ?
|
|
parent->req.nr_arg1 : 4;
|
|
if (new_flags & NM_OPEN_ARG2) {
|
|
D("overriding ARG2 %d", parent->req.nr_arg2);
|
|
d->req.nr_arg2 = parent->req.nr_arg2;
|
|
}
|
|
if (new_flags & NM_OPEN_ARG3)
|
|
D("overriding ARG3 %d", parent->req.nr_arg3);
|
|
d->req.nr_arg3 = new_flags & NM_OPEN_ARG3 ?
|
|
parent->req.nr_arg3 : 0;
|
|
if (new_flags & NM_OPEN_RING_CFG) {
|
|
D("overriding RING_CFG");
|
|
d->req.nr_tx_slots = parent->req.nr_tx_slots;
|
|
d->req.nr_rx_slots = parent->req.nr_rx_slots;
|
|
d->req.nr_tx_rings = parent->req.nr_tx_rings;
|
|
d->req.nr_rx_rings = parent->req.nr_rx_rings;
|
|
}
|
|
if (new_flags & NM_OPEN_IFNAME) {
|
|
D("overriding ifname %s ringid 0x%x flags 0x%x",
|
|
parent->req.nr_name, parent->req.nr_ringid,
|
|
parent->req.nr_flags);
|
|
memcpy(d->req.nr_name, parent->req.nr_name,
|
|
sizeof(d->req.nr_name));
|
|
d->req.nr_ringid = parent->req.nr_ringid;
|
|
d->req.nr_flags = parent->req.nr_flags;
|
|
}
|
|
}
|
|
/* add the *XPOLL flags */
|
|
d->req.nr_ringid |= new_flags & (NETMAP_NO_TX_POLL | NETMAP_DO_RX_POLL);
|
|
|
|
if (ioctl(d->fd, NIOCREGIF, &d->req)) {
|
|
snprintf(errmsg, MAXERRMSG, "NIOCREGIF failed: %s", strerror(errno));
|
|
goto fail;
|
|
}
|
|
|
|
nr_reg = d->req.nr_flags & NR_REG_MASK;
|
|
|
|
if (nr_reg == NR_REG_SW) { /* host stack */
|
|
d->first_tx_ring = d->last_tx_ring = d->req.nr_tx_rings;
|
|
d->first_rx_ring = d->last_rx_ring = d->req.nr_rx_rings;
|
|
} else if (nr_reg == NR_REG_ALL_NIC) { /* only nic */
|
|
d->first_tx_ring = 0;
|
|
d->first_rx_ring = 0;
|
|
d->last_tx_ring = d->req.nr_tx_rings - 1;
|
|
d->last_rx_ring = d->req.nr_rx_rings - 1;
|
|
} else if (nr_reg == NR_REG_NIC_SW) {
|
|
d->first_tx_ring = 0;
|
|
d->first_rx_ring = 0;
|
|
d->last_tx_ring = d->req.nr_tx_rings;
|
|
d->last_rx_ring = d->req.nr_rx_rings;
|
|
} else if (nr_reg == NR_REG_ONE_NIC) {
|
|
/* XXX check validity */
|
|
d->first_tx_ring = d->last_tx_ring =
|
|
d->first_rx_ring = d->last_rx_ring = d->req.nr_ringid & NETMAP_RING_MASK;
|
|
} else { /* pipes */
|
|
d->first_tx_ring = d->last_tx_ring = 0;
|
|
d->first_rx_ring = d->last_rx_ring = 0;
|
|
}
|
|
|
|
/* if parent is defined, do nm_mmap() even if NM_OPEN_NO_MMAP is set */
|
|
if ((!(new_flags & NM_OPEN_NO_MMAP) || parent) && nm_mmap(d, parent)) {
|
|
snprintf(errmsg, MAXERRMSG, "mmap failed: %s", strerror(errno));
|
|
goto fail;
|
|
}
|
|
|
|
|
|
#ifdef DEBUG_NETMAP_USER
|
|
{ /* debugging code */
|
|
int i;
|
|
|
|
D("%s tx %d .. %d %d rx %d .. %d %d", ifname,
|
|
d->first_tx_ring, d->last_tx_ring, d->req.nr_tx_rings,
|
|
d->first_rx_ring, d->last_rx_ring, d->req.nr_rx_rings);
|
|
for (i = 0; i <= d->req.nr_tx_rings; i++) {
|
|
struct netmap_ring *r = NETMAP_TXRING(d->nifp, i);
|
|
D("TX%d %p h %d c %d t %d", i, r, r->head, r->cur, r->tail);
|
|
}
|
|
for (i = 0; i <= d->req.nr_rx_rings; i++) {
|
|
struct netmap_ring *r = NETMAP_RXRING(d->nifp, i);
|
|
D("RX%d %p h %d c %d t %d", i, r, r->head, r->cur, r->tail);
|
|
}
|
|
}
|
|
#endif /* debugging */
|
|
|
|
d->cur_tx_ring = d->first_tx_ring;
|
|
d->cur_rx_ring = d->first_rx_ring;
|
|
return d;
|
|
|
|
fail:
|
|
nm_close(d);
|
|
if (errmsg[0])
|
|
D("%s %s", errmsg, ifname);
|
|
if (errno == 0)
|
|
errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static int
|
|
nm_close(struct nm_desc *d)
|
|
{
|
|
/*
|
|
* ugly trick to avoid unused warnings
|
|
*/
|
|
static void *__xxzt[] __attribute__ ((unused)) =
|
|
{ (void *)nm_open, (void *)nm_inject,
|
|
(void *)nm_dispatch, (void *)nm_nextpkt } ;
|
|
|
|
if (d == NULL || d->self != d)
|
|
return EINVAL;
|
|
if (d->done_mmap && d->mem)
|
|
munmap(d->mem, d->memsize);
|
|
if (d->fd != -1) {
|
|
close(d->fd);
|
|
}
|
|
|
|
bzero(d, sizeof(*d));
|
|
free(d);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
nm_mmap(struct nm_desc *d, const struct nm_desc *parent)
|
|
{
|
|
if (d->done_mmap)
|
|
return 0;
|
|
|
|
if (IS_NETMAP_DESC(parent) && parent->mem &&
|
|
parent->req.nr_arg2 == d->req.nr_arg2) {
|
|
/* do not mmap, inherit from parent */
|
|
D("do not mmap, inherit from parent");
|
|
d->memsize = parent->memsize;
|
|
d->mem = parent->mem;
|
|
} else {
|
|
/* XXX TODO: check if memsize is too large (or there is overflow) */
|
|
d->memsize = d->req.nr_memsize;
|
|
d->mem = mmap(0, d->memsize, PROT_WRITE | PROT_READ, MAP_SHARED,
|
|
d->fd, 0);
|
|
if (d->mem == MAP_FAILED) {
|
|
goto fail;
|
|
}
|
|
d->done_mmap = 1;
|
|
}
|
|
{
|
|
struct netmap_if *nifp = NETMAP_IF(d->mem, d->req.nr_offset);
|
|
struct netmap_ring *r = NETMAP_RXRING(nifp, d->first_rx_ring);
|
|
if ((void *)r == (void *)nifp) {
|
|
/* the descriptor is open for TX only */
|
|
r = NETMAP_TXRING(nifp, d->first_tx_ring);
|
|
}
|
|
|
|
*(struct netmap_if **)(uintptr_t)&(d->nifp) = nifp;
|
|
*(struct netmap_ring **)(uintptr_t)&d->some_ring = r;
|
|
*(void **)(uintptr_t)&d->buf_start = NETMAP_BUF(r, 0);
|
|
*(void **)(uintptr_t)&d->buf_end =
|
|
(char *)d->mem + d->memsize;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
return EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Same prototype as pcap_inject(), only need to cast.
|
|
*/
|
|
static int
|
|
nm_inject(struct nm_desc *d, const void *buf, size_t size)
|
|
{
|
|
u_int c, n = d->last_tx_ring - d->first_tx_ring + 1,
|
|
ri = d->cur_tx_ring;
|
|
|
|
for (c = 0; c < n ; c++, ri++) {
|
|
/* compute current ring to use */
|
|
struct netmap_ring *ring;
|
|
uint32_t i, j, idx;
|
|
size_t rem;
|
|
|
|
if (ri > d->last_tx_ring)
|
|
ri = d->first_tx_ring;
|
|
ring = NETMAP_TXRING(d->nifp, ri);
|
|
rem = size;
|
|
j = ring->cur;
|
|
while (rem > ring->nr_buf_size && j != ring->tail) {
|
|
rem -= ring->nr_buf_size;
|
|
j = nm_ring_next(ring, j);
|
|
}
|
|
if (j == ring->tail && rem > 0)
|
|
continue;
|
|
i = ring->cur;
|
|
while (i != j) {
|
|
idx = ring->slot[i].buf_idx;
|
|
ring->slot[i].len = ring->nr_buf_size;
|
|
ring->slot[i].flags = NS_MOREFRAG;
|
|
nm_pkt_copy(buf, NETMAP_BUF(ring, idx), ring->nr_buf_size);
|
|
i = nm_ring_next(ring, i);
|
|
buf = (const char *)buf + ring->nr_buf_size;
|
|
}
|
|
idx = ring->slot[i].buf_idx;
|
|
ring->slot[i].len = rem;
|
|
ring->slot[i].flags = 0;
|
|
nm_pkt_copy(buf, NETMAP_BUF(ring, idx), rem);
|
|
ring->head = ring->cur = nm_ring_next(ring, i);
|
|
d->cur_tx_ring = ri;
|
|
return size;
|
|
}
|
|
return 0; /* fail */
|
|
}
|
|
|
|
|
|
/*
|
|
* Same prototype as pcap_dispatch(), only need to cast.
|
|
*/
|
|
static int
|
|
nm_dispatch(struct nm_desc *d, int cnt, nm_cb_t cb, u_char *arg)
|
|
{
|
|
int n = d->last_rx_ring - d->first_rx_ring + 1;
|
|
int c, got = 0, ri = d->cur_rx_ring;
|
|
d->hdr.buf = NULL;
|
|
d->hdr.flags = NM_MORE_PKTS;
|
|
d->hdr.d = d;
|
|
|
|
if (cnt == 0)
|
|
cnt = -1;
|
|
/* cnt == -1 means infinite, but rings have a finite amount
|
|
* of buffers and the int is large enough that we never wrap,
|
|
* so we can omit checking for -1
|
|
*/
|
|
for (c=0; c < n && cnt != got; c++, ri++) {
|
|
/* compute current ring to use */
|
|
struct netmap_ring *ring;
|
|
|
|
if (ri > d->last_rx_ring)
|
|
ri = d->first_rx_ring;
|
|
ring = NETMAP_RXRING(d->nifp, ri);
|
|
for ( ; !nm_ring_empty(ring) && cnt != got; got++) {
|
|
u_int idx, i;
|
|
u_char *oldbuf;
|
|
struct netmap_slot *slot;
|
|
if (d->hdr.buf) { /* from previous round */
|
|
cb(arg, &d->hdr, d->hdr.buf);
|
|
}
|
|
i = ring->cur;
|
|
slot = &ring->slot[i];
|
|
idx = slot->buf_idx;
|
|
/* d->cur_rx_ring doesn't change inside this loop, but
|
|
* set it here, so it reflects d->hdr.buf's ring */
|
|
d->cur_rx_ring = ri;
|
|
d->hdr.slot = slot;
|
|
oldbuf = d->hdr.buf = (u_char *)NETMAP_BUF(ring, idx);
|
|
// __builtin_prefetch(buf);
|
|
d->hdr.len = d->hdr.caplen = slot->len;
|
|
while (slot->flags & NS_MOREFRAG) {
|
|
u_char *nbuf;
|
|
u_int oldlen = slot->len;
|
|
i = nm_ring_next(ring, i);
|
|
slot = &ring->slot[i];
|
|
d->hdr.len += slot->len;
|
|
nbuf = (u_char *)NETMAP_BUF(ring, slot->buf_idx);
|
|
if (oldbuf != NULL && nbuf - oldbuf == ring->nr_buf_size &&
|
|
oldlen == ring->nr_buf_size) {
|
|
d->hdr.caplen += slot->len;
|
|
oldbuf = nbuf;
|
|
} else {
|
|
oldbuf = NULL;
|
|
}
|
|
}
|
|
d->hdr.ts = ring->ts;
|
|
ring->head = ring->cur = nm_ring_next(ring, i);
|
|
}
|
|
}
|
|
if (d->hdr.buf) { /* from previous round */
|
|
d->hdr.flags = 0;
|
|
cb(arg, &d->hdr, d->hdr.buf);
|
|
}
|
|
return got;
|
|
}
|
|
|
|
static u_char *
|
|
nm_nextpkt(struct nm_desc *d, struct nm_pkthdr *hdr)
|
|
{
|
|
int ri = d->cur_rx_ring;
|
|
|
|
do {
|
|
/* compute current ring to use */
|
|
struct netmap_ring *ring = NETMAP_RXRING(d->nifp, ri);
|
|
if (!nm_ring_empty(ring)) {
|
|
u_int i = ring->cur;
|
|
u_int idx = ring->slot[i].buf_idx;
|
|
u_char *buf = (u_char *)NETMAP_BUF(ring, idx);
|
|
|
|
// __builtin_prefetch(buf);
|
|
hdr->ts = ring->ts;
|
|
hdr->len = hdr->caplen = ring->slot[i].len;
|
|
ring->cur = nm_ring_next(ring, i);
|
|
/* we could postpone advancing head if we want
|
|
* to hold the buffer. This can be supported in
|
|
* the future.
|
|
*/
|
|
ring->head = ring->cur;
|
|
d->cur_rx_ring = ri;
|
|
return buf;
|
|
}
|
|
ri++;
|
|
if (ri > d->last_rx_ring)
|
|
ri = d->first_rx_ring;
|
|
} while (ri != d->cur_rx_ring);
|
|
return NULL; /* nothing found */
|
|
}
|
|
|
|
#endif /* !HAVE_NETMAP_WITH_LIBS */
|
|
|
|
#endif /* NETMAP_WITH_LIBS */
|
|
|
|
#endif /* _NET_NETMAP_USER_H_ */
|