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683 lines
16 KiB
C
683 lines
16 KiB
C
/*
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* ng_source.c
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*
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* Copyright 2002 Sandvine Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Sandvine Inc.; provided,
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* however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Sandvine Inc.
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* trademarks, including the mark "SANDVINE" on advertising, endorsements,
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* or otherwise except as such appears in the above copyright notice or in
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* the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY SANDVINE "AS IS", AND TO THE MAXIMUM
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* EXTENT PERMITTED BY LAW, SANDVINE MAKES NO REPRESENTATIONS OR WARRANTIES,
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* EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, INCLUDING WITHOUT LIMITATION,
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* ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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* PURPOSE, OR NON-INFRINGEMENT. SANDVINE DOES NOT WARRANT, GUARANTEE, OR
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* MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE
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* USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY
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* OR OTHERWISE. IN NO EVENT SHALL SANDVINE BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF SANDVINE IS ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* Author: Dave Chapeskie <dchapeskie@sandvine.com>
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*
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* $FreeBSD$
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*/
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/*
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* This node is used for high speed packet geneneration. It queues
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* all data recieved on it's 'input' hook and when told to start via
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* a control message it sends the packets out it's 'output' hook. In
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* this way this node can be preloaded with a packet stream which is
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* continuously sent.
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*
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* Currently it just copies the mbufs as required. It could do various
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* tricks to try and avoid this. Probably the best performance would
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* be achieved by modifying the appropriate drivers to be told to
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* self-re-enqueue packets (e.g. the if_bge driver could reuse the same
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* transmit descriptors) under control of this node; perhaps via some
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* flag in the mbuf or some such. The node would peak at an appropriate
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* ifnet flag to see if such support is available for the connected
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* interface.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_parse.h>
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#include <netgraph/ng_ether.h>
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#include <netgraph/ng_source.h>
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#define NG_SOURCE_INTR_TICKS 1
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#define NG_SOURCE_DRIVER_IFQ_MAXLEN (4*1024)
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/* Per hook info */
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struct source_hookinfo {
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hook_p hook;
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};
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/* Per node info */
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struct privdata {
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node_p node;
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struct source_hookinfo input;
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struct source_hookinfo output;
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struct ng_source_stats stats;
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struct ifqueue snd_queue; /* packets to send */
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struct ifnet *output_ifp;
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struct callout_handle intr_ch;
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u_int64_t packets; /* packets to send */
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u_int32_t queueOctets;
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};
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typedef struct privdata *sc_p;
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/* Node flags */
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#define NG_SOURCE_ACTIVE (NGF_TYPE1)
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/* XXX */
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#if 1
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#undef KASSERT
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#define KASSERT(expr,msg) do { \
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if (!(expr)) { \
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printf msg ; \
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panic("Assertion"); \
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} \
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} while(0)
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#endif
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/* Netgraph methods */
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static ng_constructor_t ng_source_constructor;
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static ng_rcvmsg_t ng_source_rcvmsg;
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static ng_shutdown_t ng_source_rmnode;
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static ng_newhook_t ng_source_newhook;
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static ng_rcvdata_t ng_source_rcvdata;
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static ng_disconnect_t ng_source_disconnect;
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/* Other functions */
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static timeout_t ng_source_intr;
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static void ng_source_request_output_ifp (sc_p);
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static void ng_source_clr_data (sc_p);
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static void ng_source_start (sc_p);
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static void ng_source_stop (sc_p);
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static int ng_source_send (sc_p, int, int *);
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static int ng_source_store_output_ifp(sc_p sc,
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struct ng_mesg *msg);
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/* Parse type for timeval */
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static const struct ng_parse_struct_field ng_source_timeval_type_fields[] =
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{
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{ "tv_sec", &ng_parse_int32_type },
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{ "tv_usec", &ng_parse_int32_type },
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{ NULL }
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};
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const struct ng_parse_type ng_source_timeval_type = {
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&ng_parse_struct_type,
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&ng_source_timeval_type_fields
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};
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/* Parse type for struct ng_source_stats */
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static const struct ng_parse_struct_field ng_source_stats_type_fields[]
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= NG_SOURCE_STATS_TYPE_INFO;
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static const struct ng_parse_type ng_source_stats_type = {
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&ng_parse_struct_type,
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&ng_source_stats_type_fields
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};
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/* List of commands and how to convert arguments to/from ASCII */
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static const struct ng_cmdlist ng_source_cmds[] = {
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{
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NGM_SOURCE_COOKIE,
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NGM_SOURCE_GET_STATS,
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"getstats",
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NULL,
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&ng_source_stats_type
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},
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{
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NGM_SOURCE_COOKIE,
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NGM_SOURCE_CLR_STATS,
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"clrstats",
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NULL,
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NULL
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},
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{
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NGM_SOURCE_COOKIE,
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NGM_SOURCE_GETCLR_STATS,
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"getclrstats",
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NULL,
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&ng_source_stats_type
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},
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{
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NGM_SOURCE_COOKIE,
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NGM_SOURCE_START,
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"start",
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&ng_parse_uint64_type,
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NULL
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},
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{
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NGM_SOURCE_COOKIE,
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NGM_SOURCE_STOP,
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"stop",
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NULL,
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NULL
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},
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{
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NGM_SOURCE_COOKIE,
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NGM_SOURCE_CLR_DATA,
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"clrdata",
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NULL,
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NULL
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},
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{ 0 }
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};
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/* Netgraph type descriptor */
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static struct ng_type ng_source_typestruct = {
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NG_VERSION,
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NG_SOURCE_NODE_TYPE,
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NULL, /* module event handler */
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ng_source_constructor,
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ng_source_rcvmsg,
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ng_source_rmnode,
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ng_source_newhook,
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NULL, /* findhook */
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NULL,
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ng_source_rcvdata, /* rcvdata */
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ng_source_disconnect,
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ng_source_cmds
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};
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NETGRAPH_INIT(source, &ng_source_typestruct);
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/*
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* Node constructor
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*/
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static int
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ng_source_constructor(node_p node)
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{
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sc_p sc;
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MALLOC(sc, sc_p, sizeof(*sc), M_NETGRAPH, M_NOWAIT);
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if (sc == NULL)
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return (ENOMEM);
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bzero(sc, sizeof(*sc));
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NG_NODE_SET_PRIVATE(node, sc);
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sc->node = node;
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sc->snd_queue.ifq_maxlen = 2048; /* XXX not checked */
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callout_handle_init(&sc->intr_ch); /* XXX fix.. will
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cause problems. */
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return (0);
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}
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/*
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* Add a hook
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*/
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static int
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ng_source_newhook(node_p node, hook_p hook, const char *name)
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{
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sc_p sc;
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sc = NG_NODE_PRIVATE(node);
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KASSERT(sc != NULL, ("%s: null node private", __FUNCTION__));
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if (strcmp(name, NG_SOURCE_HOOK_INPUT) == 0) {
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sc->input.hook = hook;
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NG_HOOK_SET_PRIVATE(hook, &sc->input);
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} else if (strcmp(name, NG_SOURCE_HOOK_OUTPUT) == 0) {
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sc->output.hook = hook;
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NG_HOOK_SET_PRIVATE(hook, &sc->output);
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sc->output_ifp = 0;
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bzero(&sc->stats, sizeof(sc->stats));
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} else
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return (EINVAL);
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return (0);
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}
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/*
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* Receive a control message
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*/
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static int
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ng_source_rcvmsg(node_p node, item_p item, hook_p lasthook)
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{
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sc_p sc;
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struct ng_mesg *resp = NULL;
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int error = 0;
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struct ng_mesg *msg;
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sc = NG_NODE_PRIVATE(node);
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NGI_GET_MSG(item, msg);
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KASSERT(sc != NULL, ("%s: null node private", __FUNCTION__));
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switch (msg->header.typecookie) {
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case NGM_SOURCE_COOKIE:
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if (msg->header.flags & NGF_RESP) {
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error = EINVAL;
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break;
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}
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switch (msg->header.cmd) {
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case NGM_SOURCE_GET_STATS:
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case NGM_SOURCE_CLR_STATS:
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case NGM_SOURCE_GETCLR_STATS:
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{
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struct ng_source_stats *stats;
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if (msg->header.cmd != NGM_SOURCE_CLR_STATS) {
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NG_MKRESPONSE(resp, msg,
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sizeof(*stats), M_NOWAIT);
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if (resp == NULL) {
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error = ENOMEM;
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goto done;
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}
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sc->stats.queueOctets = sc->queueOctets;
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sc->stats.queueFrames = sc->snd_queue.ifq_len;
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if ((sc->node->nd_flags & NG_SOURCE_ACTIVE)
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&& !timevalisset(&sc->stats.endTime)) {
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getmicrotime(&sc->stats.elapsedTime);
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timevalsub(&sc->stats.elapsedTime,
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&sc->stats.startTime);
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}
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stats = (struct ng_source_stats *)resp->data;
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bcopy(&sc->stats, stats, sizeof(* stats));
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}
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if (msg->header.cmd != NGM_SOURCE_GET_STATS)
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bzero(&sc->stats, sizeof(sc->stats));
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}
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break;
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case NGM_SOURCE_START:
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{
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u_int64_t packets = *(u_int64_t *)msg->data;
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if (sc->output.hook == NULL) {
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printf("%s: start on node with no output hook\n"
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, __FUNCTION__);
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error = EINVAL;
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break;
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}
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/* TODO validation of packets */
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sc->packets = packets;
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ng_source_start(sc);
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}
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break;
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case NGM_SOURCE_STOP:
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ng_source_stop(sc);
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break;
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case NGM_SOURCE_CLR_DATA:
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ng_source_clr_data(sc);
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break;
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default:
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error = EINVAL;
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break;
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}
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break;
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case NGM_ETHER_COOKIE:
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if (!(msg->header.flags & NGF_RESP)) {
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error = EINVAL;
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break;
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}
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switch (msg->header.cmd) {
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case NGM_ETHER_GET_IFINDEX:
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if (ng_source_store_output_ifp(sc, msg) == 0) {
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ng_source_set_autosrc(sc, 0);
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sc->node->nd_flags |= NG_SOURCE_ACTIVE;
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timevalclear(&sc->stats.elapsedTime);
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timevalclear(&sc->stats.endTime);
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getmicrotime(&sc->stats.startTime);
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sc->intr_ch = timeout(ng_source_intr, sc, 0);
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}
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break;
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default:
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error = EINVAL;
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}
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break;
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default:
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error = EINVAL;
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break;
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}
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done:
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/* Take care of synchronous response, if any */
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NG_RESPOND_MSG(error, node, item, resp);
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/* Free the message and return */
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NG_FREE_MSG(msg);
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return (error);
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}
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/*
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* Receive data on a hook
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*
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* If data comes in the input hook, enqueue it on the send queue.
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* If data comes in the output hook, discard it.
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*/
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static int
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ng_source_rcvdata(hook_p hook, item_p item)
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{
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sc_p sc;
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struct source_hookinfo *hinfo;
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int error = 0;
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struct mbuf *m;
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sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
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NGI_GET_M(item, m);
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NG_FREE_ITEM(item);
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hinfo = NG_HOOK_PRIVATE(hook);
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KASSERT(sc != NULL, ("%s: null node private", __FUNCTION__));
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KASSERT(hinfo != NULL, ("%s: null hook info", __FUNCTION__));
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/* Which hook? */
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if (hinfo == &sc->output) {
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/* discard */
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NG_FREE_M(m);
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return (error);
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}
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KASSERT(hinfo == &sc->input, ("%s: no hook!", __FUNCTION__));
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if ((m->m_flags & M_PKTHDR) == 0) {
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printf("%s: mbuf without PKTHDR\n", __FUNCTION__);
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NG_FREE_M(m);
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return (EINVAL);
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}
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/* enque packet */
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/* XXX should we check IF_QFULL() ? */
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IF_ENQUEUE(&sc->snd_queue, m);
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sc->queueOctets += m->m_pkthdr.len;
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return (0);
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}
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/*
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* Shutdown processing
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*/
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static int
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ng_source_rmnode(node_p node)
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{
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sc_p sc;
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sc = NG_NODE_PRIVATE(node);
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KASSERT(sc != NULL, ("%s: null node private", __FUNCTION__));
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node->nd_flags |= NG_INVALID;
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ng_source_stop(sc);
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ng_source_clr_data(sc);
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NG_NODE_SET_PRIVATE(node, NULL);
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NG_NODE_UNREF(node);
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FREE(sc, M_NETGRAPH);
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return (0);
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}
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/*
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* Hook disconnection
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*/
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static int
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ng_source_disconnect(hook_p hook)
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{
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struct source_hookinfo *hinfo;
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sc_p sc;
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hinfo = NG_HOOK_PRIVATE(hook);
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sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
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KASSERT(sc != NULL, ("%s: null node private", __FUNCTION__));
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hinfo->hook = NULL;
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if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 || hinfo == &sc->output)
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ng_rmnode_self(NG_HOOK_NODE(hook));
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return (0);
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}
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/*
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*
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* Ask out neighbour on the output hook side to send us it's interface
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* information.
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*/
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static void
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ng_source_request_output_ifp(sc_p sc)
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{
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struct ng_mesg *msg;
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int error = 0;
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sc->output_ifp = NULL;
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/* Ask the attached node for the connected interface's index */
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NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_IFINDEX, 0, M_NOWAIT);
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if (msg == NULL)
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return (ENOBUFS);
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NG_SEND_MSG_HOOK(error, sc->node, msg, sc->output.hook, NULL);
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return (error);
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}
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/*
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* Set sc->output_ifp to point to the the struct ifnet of the interface
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* reached via our output hook.
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*/
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static int
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ng_source_store_output_ifp(sc_p sc, struct ng_mesg *msg)
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{
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struct ifnet *ifp;
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u_int32_t if_index;
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int s;
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if (msg->header.arglen < sizeof(u_int32_t))
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return (EINVAL);
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if_index = *(u_int32_t *)msg->data;
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/* Could use ifindex2ifnet[if_index] except that we have no
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* way of verifying if_index is valid since if_indexlim is
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* local to if_attach()
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*/
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TAILQ_FOREACH(ifp, &ifnet, if_link) {
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if (ifp->if_index == if_index)
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break;
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}
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if (ifp == NULL) {
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printf("%s: can't find interface %d\n", __FUNCTION__, if_index);
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return (EINVAL);
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}
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sc->output_ifp = ifp;
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#if 1
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/* XXX mucking with a drivers ifqueue size is ugly but we need it
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* to queue a lot of packets to get close to line rate on a gigabit
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* interface with small packets.
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* XXX we should restore the original value at stop or disconnect
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*/
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s = splimp(); /* XXX is this required? */
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if (ifp->if_snd.ifq_maxlen < NG_SOURCE_DRIVER_IFQ_MAXLEN)
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{
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printf("ng_source: changing ifq_maxlen from %d to %d\n",
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ifp->if_snd.ifq_maxlen, NG_SOURCE_DRIVER_IFQ_MAXLEN);
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ifp->if_snd.ifq_maxlen = NG_SOURCE_DRIVER_IFQ_MAXLEN;
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}
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splx(s);
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#endif
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return (0);
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}
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/*
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* Set the attached ethernet node's ethernet source address override flag.
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*/
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static int
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ng_source_set_autosrc(sc_p sc, u_int32_t flag)
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{
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struct ng_mesg *msg;
|
|
int error = 0;
|
|
|
|
NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_SET_AUTOSRC,
|
|
sizeof (u_int32_t), M_NOWAIT);
|
|
if (msg == NULL)
|
|
return(ENOBUFS);
|
|
|
|
*(u_int32_t *)msg->data = flag;
|
|
NG_SEND_MSG_HOOK(error, sc->node, msg, sc->output.hook, NULL);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Clear out the data we've queued
|
|
*/
|
|
static void
|
|
ng_source_clr_data (sc_p sc)
|
|
{
|
|
struct mbuf *m;
|
|
|
|
for (;;) {
|
|
IF_DEQUEUE(&sc->snd_queue, m);
|
|
if (m == NULL)
|
|
break;
|
|
NG_FREE_M(m);
|
|
}
|
|
sc->queueOctets = 0;
|
|
}
|
|
|
|
/*
|
|
* Start sending queued data out the output hook
|
|
*/
|
|
static void
|
|
ng_source_start (sc_p sc)
|
|
{
|
|
KASSERT(sc->output.hook != NULL,
|
|
("%s: output hook unconnected", __FUNCTION__));
|
|
if (((sc->node->nd_flags & NG_SOURCE_ACTIVE) == 0) &&
|
|
(sc->output_ifp == NULL))
|
|
ng_source_request_output_ifp(sc);
|
|
}
|
|
|
|
/*
|
|
* Stop sending queued data out the output hook
|
|
*/
|
|
static void
|
|
ng_source_stop (sc_p sc)
|
|
{
|
|
if (sc->node->nd_flags & NG_SOURCE_ACTIVE) {
|
|
untimeout(ng_source_intr, sc, sc->intr_ch);
|
|
sc->node->nd_flags &= ~NG_SOURCE_ACTIVE;
|
|
getmicrotime(&sc->stats.endTime);
|
|
sc->stats.elapsedTime = sc->stats.endTime;
|
|
timevalsub(&sc->stats.elapsedTime, &sc->stats.startTime);
|
|
/* XXX should set this to the initial value instead */
|
|
ng_source_set_autosrc(sc, 1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* While active called every NG_SOURCE_INTR_TICKS ticks.
|
|
* Sends as many packets as the interface connected to our
|
|
* output hook is able to enqueue.
|
|
*/
|
|
static void
|
|
ng_source_intr (void *arg)
|
|
{
|
|
sc_p sc = (sc_p) arg;
|
|
struct ifqueue *ifq;
|
|
int packets;
|
|
|
|
KASSERT(sc != NULL, ("%s: null node private", __FUNCTION__));
|
|
|
|
callout_handle_init(&sc->intr_ch);
|
|
if (sc->packets == 0 || sc->output.hook == NULL
|
|
|| (sc->node->nd_flags & NG_SOURCE_ACTIVE) == 0) {
|
|
ng_source_stop(sc);
|
|
return;
|
|
}
|
|
|
|
ifq = &sc->output_ifp->if_snd;
|
|
packets = ifq->ifq_maxlen - ifq->ifq_len;
|
|
ng_source_send(sc, packets, NULL);
|
|
if (sc->packets == 0) {
|
|
int s = splnet();
|
|
ng_source_stop(sc);
|
|
splx(s);
|
|
} else
|
|
sc->intr_ch = timeout(ng_source_intr, sc, NG_SOURCE_INTR_TICKS);
|
|
}
|
|
|
|
/*
|
|
* Send packets out our output hook
|
|
*/
|
|
static int
|
|
ng_source_send (sc_p sc, int tosend, int *sent_p)
|
|
{
|
|
struct ifqueue tmp_queue;
|
|
struct mbuf *m, *m2;
|
|
int sent = 0;
|
|
int error = 0;
|
|
int s, s2;
|
|
|
|
KASSERT(sc != NULL, ("%s: null node private", __FUNCTION__));
|
|
KASSERT(tosend >= 0, ("%s: negative tosend param", __FUNCTION__));
|
|
KASSERT(sc->node->nd_flags & NG_SOURCE_ACTIVE,
|
|
("%s: inactive node", __FUNCTION__));
|
|
|
|
if ((u_int64_t)tosend > sc->packets)
|
|
tosend = sc->packets;
|
|
|
|
/* Copy the required number of packets to a temporary queue */
|
|
bzero (&tmp_queue, sizeof (tmp_queue));
|
|
for (sent = 0; error == 0 && sent < tosend; ++sent) {
|
|
s = splnet();
|
|
IF_DEQUEUE(&sc->snd_queue, m);
|
|
splx(s);
|
|
if (m == NULL)
|
|
break;
|
|
|
|
/* duplicate the packet */
|
|
m2 = m_copypacket(m, M_NOWAIT);
|
|
if (m2 == NULL) {
|
|
s = splnet();
|
|
IF_PREPEND(&sc->snd_queue, m);
|
|
splx(s);
|
|
error = ENOBUFS;
|
|
break;
|
|
}
|
|
|
|
/* re-enqueue the original packet for us */
|
|
s = splnet();
|
|
IF_ENQUEUE(&sc->snd_queue, m);
|
|
splx(s);
|
|
|
|
/* queue the copy for sending at smplimp */
|
|
IF_ENQUEUE(&tmp_queue, m2);
|
|
}
|
|
|
|
sent = 0;
|
|
s = splimp();
|
|
for (;;) {
|
|
IF_DEQUEUE(&tmp_queue, m2);
|
|
if (m2 == NULL)
|
|
break;
|
|
if (error == 0) {
|
|
++sent;
|
|
sc->stats.outFrames++;
|
|
sc->stats.outOctets += m2->m_pkthdr.len;
|
|
s2 = splnet();
|
|
NG_SEND_DATA_ONLY(error, sc->output.hook, m2);
|
|
splx(s2);
|
|
} else {
|
|
NG_FREE_M(m2);
|
|
}
|
|
}
|
|
splx(s);
|
|
|
|
sc->packets -= sent;
|
|
if (sent_p != NULL)
|
|
*sent_p = sent;
|
|
return (error);
|
|
}
|