From patchwork Wed Mar 16 10:38:52 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Chen X-Patchwork-Id: 598235 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3qQ7KX4MPqz9sRB for ; Wed, 16 Mar 2016 21:40:00 +1100 (AEDT) Received: from localhost ([::1]:54666 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ag8ru-0000RY-5s for incoming@patchwork.ozlabs.org; Wed, 16 Mar 2016 06:39:58 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57952) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ag8qd-0007Vy-Du for qemu-devel@nongnu.org; Wed, 16 Mar 2016 06:39:28 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ag8ps-0006eE-0m for qemu-devel@nongnu.org; Wed, 16 Mar 2016 06:38:39 -0400 Received: from [59.151.112.132] (port=14342 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ag8pr-0006GC-18 for qemu-devel@nongnu.org; Wed, 16 Mar 2016 06:37:51 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="4638598" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 16 Mar 2016 18:37:29 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (unknown [10.167.33.80]) by cn.fujitsu.com (Postfix) with ESMTP id 8FE0C42B4B10; Wed, 16 Mar 2016 18:37:26 +0800 (CST) Received: from G08FNSTD140215.g08.fujitsu.local (10.167.226.56) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.181.6; Wed, 16 Mar 2016 18:37:26 +0800 From: Zhang Chen To: qemu devel , Jason Wang Date: Wed, 16 Mar 2016 18:38:52 +0800 Message-ID: <1458124733-13901-2-git-send-email-zhangchen.fnst@cn.fujitsu.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1458124733-13901-1-git-send-email-zhangchen.fnst@cn.fujitsu.com> References: <1458124733-13901-1-git-send-email-zhangchen.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.56] X-yoursite-MailScanner-ID: 8FE0C42B4B10.A0772 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: zhangchen.fnst@cn.fujitsu.com X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 59.151.112.132 Cc: Li Zhijian , Gui jianfeng , "eddie.dong" , zhanghailiang , "Dr. David Alan Gilbert" , Zhang Chen , Yang Hongyang Subject: [Qemu-devel] [PATCH V5 1/2] net/filter-mirror: implement filter-redirector X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Filter-redirector is a netfilter plugin. It gives qemu the ability to redirect net packet. redirector can redirect filter's net packet to outdev. and redirect indev's packet to filter. filter + redirector | +--------------+ | | | indev +-----------+ +----------> outdev | | | +--------------+ | v filter usage: -netdev user,id=hn0 -chardev socket,id=s0,host=ip_primary,port=X,server,nowait -chardev socket,id=s1,host=ip_primary,port=Y,server,nowait -filter-redirector,id=r0,netdev=hn0,queue=tx/rx/all,indev=s0,outdev=s1 Signed-off-by: Zhang Chen Signed-off-by: Wen Congyang Signed-off-by: Li Zhijian --- net/filter-mirror.c | 245 ++++++++++++++++++++++++++++++++++++++++++++++++++++ qemu-options.hx | 9 ++ vl.c | 3 +- 3 files changed, 256 insertions(+), 1 deletion(-) diff --git a/net/filter-mirror.c b/net/filter-mirror.c index 1b1ec16..7b47c60 100644 --- a/net/filter-mirror.c +++ b/net/filter-mirror.c @@ -26,12 +26,23 @@ #define FILTER_MIRROR(obj) \ OBJECT_CHECK(MirrorState, (obj), TYPE_FILTER_MIRROR) +#define FILTER_REDIRECTOR(obj) \ + OBJECT_CHECK(MirrorState, (obj), TYPE_FILTER_REDIRECTOR) + #define TYPE_FILTER_MIRROR "filter-mirror" +#define TYPE_FILTER_REDIRECTOR "filter-redirector" +#define REDIRECTOR_MAX_LEN NET_BUFSIZE typedef struct MirrorState { NetFilterState parent_obj; + char *indev; char *outdev; + CharDriverState *chr_in; CharDriverState *chr_out; + int state; /* 0 = getting length, 1 = getting data */ + unsigned int index; + unsigned int packet_len; + uint8_t buf[REDIRECTOR_MAX_LEN]; } MirrorState; static int filter_mirror_send(CharDriverState *chr_out, @@ -68,6 +79,97 @@ err: return ret < 0 ? ret : -EIO; } +static void +redirector_to_filter(NetFilterState *nf, const uint8_t *buf, int len) +{ + struct iovec iov = { + .iov_base = (void *)buf, + .iov_len = len, + }; + + if (nf->direction == NET_FILTER_DIRECTION_ALL || + nf->direction == NET_FILTER_DIRECTION_TX) { + qemu_netfilter_pass_to_next(nf->netdev, 0, &iov, 1, nf); + } + + if (nf->direction == NET_FILTER_DIRECTION_ALL || + nf->direction == NET_FILTER_DIRECTION_RX) { + qemu_netfilter_pass_to_next(nf->netdev->peer, 0, &iov, 1, nf); + } +} + +static int redirector_chr_can_read(void *opaque) +{ + return REDIRECTOR_MAX_LEN; +} + +static void redirector_chr_read(void *opaque, const uint8_t *buf, int size) +{ + NetFilterState *nf = opaque; + MirrorState *s = FILTER_REDIRECTOR(nf); + unsigned int l; + + while (size > 0) { + /* reassemble a packet from the network */ + switch (s->state) { /* 0 = getting length, 1 = getting data */ + case 0: + l = 4 - s->index; + if (l > size) { + l = size; + } + memcpy(s->buf + s->index, buf, l); + buf += l; + size -= l; + s->index += l; + if (s->index == 4) { + /* got length */ + s->packet_len = ntohl(*(uint32_t *)s->buf); + s->index = 0; + s->state = 1; + } + break; + case 1: + l = s->packet_len - s->index; + if (l > size) { + l = size; + } + if (s->index + l <= sizeof(s->buf)) { + memcpy(s->buf + s->index, buf, l); + } else { + error_report("%s, serious error: oversized packet received," + "connection terminated.", __func__); + s->index = s->state = 0; + qemu_chr_add_handlers(s->chr_in, NULL, NULL, NULL, NULL); + return; + } + + s->index += l; + buf += l; + size -= l; + if (s->index >= s->packet_len) { + s->index = 0; + s->state = 0; + redirector_to_filter(nf, s->buf, s->packet_len); + } + break; + } + } +} + +static void redirector_chr_event(void *opaque, int event) +{ + NetFilterState *nf = opaque; + MirrorState *s = FILTER_REDIRECTOR(nf); + + switch(event) { + case CHR_EVENT_CLOSED: + qemu_chr_add_handlers(s->chr_in, NULL, NULL, NULL, NULL); + break; + default: + break; + } +} + static ssize_t filter_mirror_receive_iov(NetFilterState *nf, NetClientState *sender, unsigned flags, @@ -90,6 +192,27 @@ static ssize_t filter_mirror_receive_iov(NetFilterState *nf, return 0; } +static ssize_t filter_redirector_receive_iov(NetFilterState *nf, + NetClientState *sender, + unsigned flags, + const struct iovec *iov, + int iovcnt, + NetPacketSent *sent_cb) +{ + MirrorState *s = FILTER_REDIRECTOR(nf); + int ret; + + if (s->chr_out) { + ret = filter_mirror_send(s->chr_out, iov, iovcnt); + if (ret) { + error_report("filter_mirror_send failed(%s)", strerror(-ret)); + } + return iov_size(iov, iovcnt); + } else { + return 0; + } +} + static void filter_mirror_cleanup(NetFilterState *nf) { MirrorState *s = FILTER_MIRROR(nf); @@ -99,6 +222,18 @@ static void filter_mirror_cleanup(NetFilterState *nf) } } +static void filter_redirector_cleanup(NetFilterState *nf) +{ + MirrorState *s = FILTER_REDIRECTOR(nf); + + if (s->chr_in) { + qemu_chr_fe_release(s->chr_in); + } + if (s->chr_out) { + qemu_chr_fe_release(s->chr_out); + } +} + static void filter_mirror_setup(NetFilterState *nf, Error **errp) { MirrorState *s = FILTER_MIRROR(nf); @@ -122,6 +257,48 @@ static void filter_mirror_setup(NetFilterState *nf, Error **errp) } } +static void filter_redirector_setup(NetFilterState *nf, Error **errp) +{ + MirrorState *s = FILTER_REDIRECTOR(nf); + + if (!s->indev && !s->outdev) { + error_setg(errp, "filter redirector needs 'indev' or " + "'outdev' at least one property set"); + return; + } else if (s->indev && s->outdev) { + if (!strcmp(s->indev, s->outdev)) { + error_setg(errp, "filter redirector needs 'indev' and " + "'outdev' are not same"); + return; + } + } + + s->state = s->index = 0; + + if (s->indev) { + s->chr_in = qemu_chr_find(s->indev); + if (s->chr_in == NULL) { + error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, + "IN Device '%s' not found", s->indev); + return; + } + + qemu_chr_fe_claim_no_fail(s->chr_in); + qemu_chr_add_handlers(s->chr_in, redirector_chr_can_read, + redirector_chr_read, redirector_chr_event, nf); + } + + if (s->outdev) { + s->chr_out = qemu_chr_find(s->outdev); + if (s->chr_out == NULL) { + error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, + "OUT Device '%s' not found", s->outdev); + return; + } + qemu_chr_fe_claim_no_fail(s->chr_out); + } +} + static void filter_mirror_class_init(ObjectClass *oc, void *data) { NetFilterClass *nfc = NETFILTER_CLASS(oc); @@ -131,6 +308,31 @@ static void filter_mirror_class_init(ObjectClass *oc, void *data) nfc->receive_iov = filter_mirror_receive_iov; } +static void filter_redirector_class_init(ObjectClass *oc, void *data) +{ + NetFilterClass *nfc = NETFILTER_CLASS(oc); + + nfc->setup = filter_redirector_setup; + nfc->cleanup = filter_redirector_cleanup; + nfc->receive_iov = filter_redirector_receive_iov; +} + +static char *filter_redirector_get_indev(Object *obj, Error **errp) +{ + MirrorState *s = FILTER_REDIRECTOR(obj); + + return g_strdup(s->indev); +} + +static void +filter_redirector_set_indev(Object *obj, const char *value, Error **errp) +{ + MirrorState *s = FILTER_REDIRECTOR(obj); + + g_free(s->indev); + s->indev = g_strdup(value); +} + static char *filter_mirror_get_outdev(Object *obj, Error **errp) { MirrorState *s = FILTER_MIRROR(obj); @@ -152,12 +354,36 @@ filter_mirror_set_outdev(Object *obj, const char *value, Error **errp) } } +static char *filter_redirector_get_outdev(Object *obj, Error **errp) +{ + MirrorState *s = FILTER_REDIRECTOR(obj); + + return g_strdup(s->outdev); +} + +static void +filter_redirector_set_outdev(Object *obj, const char *value, Error **errp) +{ + MirrorState *s = FILTER_REDIRECTOR(obj); + + g_free(s->outdev); + s->outdev = g_strdup(value); +} + static void filter_mirror_init(Object *obj) { object_property_add_str(obj, "outdev", filter_mirror_get_outdev, filter_mirror_set_outdev, NULL); } +static void filter_redirector_init(Object *obj) +{ + object_property_add_str(obj, "indev", filter_redirector_get_indev, + filter_redirector_set_indev, NULL); + object_property_add_str(obj, "outdev", filter_redirector_get_outdev, + filter_redirector_set_outdev, NULL); +} + static void filter_mirror_fini(Object *obj) { MirrorState *s = FILTER_MIRROR(obj); @@ -165,6 +391,24 @@ static void filter_mirror_fini(Object *obj) g_free(s->outdev); } +static void filter_redirector_fini(Object *obj) +{ + MirrorState *s = FILTER_REDIRECTOR(obj); + + qemu_chr_add_handlers(s->chr_in, NULL, NULL, NULL, NULL); + g_free(s->indev); + g_free(s->outdev); +} + +static const TypeInfo filter_redirector_info = { + .name = TYPE_FILTER_REDIRECTOR, + .parent = TYPE_NETFILTER, + .class_init = filter_redirector_class_init, + .instance_init = filter_redirector_init, + .instance_finalize = filter_redirector_fini, + .instance_size = sizeof(MirrorState), +}; + static const TypeInfo filter_mirror_info = { .name = TYPE_FILTER_MIRROR, .parent = TYPE_NETFILTER, @@ -177,6 +421,7 @@ static const TypeInfo filter_mirror_info = { static void register_types(void) { type_register_static(&filter_mirror_info); + type_register_static(&filter_redirector_info); } type_init(register_types); diff --git a/qemu-options.hx b/qemu-options.hx index 5379cb5..796d053 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -3821,6 +3821,15 @@ queue @var{all|rx|tx} is an option that can be applied to any netfilter. filter-mirror on netdev @var{netdevid},mirror net packet to chardev @var{chardevid} +@item -object filter-redirector,id=@var{id},netdev=@var{netdevid},indev=@var{chardevid}, +outdev=@var{chardevid}[,queue=@var{all|rx|tx}] + +filter-redirector on netdev @var{netdevid},redirect filter's net packet to chardev +@var{chardevid},and redirect indev's packet to filter. +Create a filter-redirector we need to differ outdev id from indev id, id can not +be the same. we can just use indev or outdev, but at least one of indev or outdev +need to be specified. + @item -object filter-dump,id=@var{id},netdev=@var{dev},file=@var{filename}][,maxlen=@var{len}] Dump the network traffic on netdev @var{dev} to the file specified by diff --git a/vl.c b/vl.c index 79bb11a..dc6e63a 100644 --- a/vl.c +++ b/vl.c @@ -2841,7 +2841,8 @@ static bool object_create_initial(const char *type) */ if (g_str_equal(type, "filter-buffer") || g_str_equal(type, "filter-dump") || - g_str_equal(type, "filter-mirror")) { + g_str_equal(type, "filter-mirror") || + g_str_equal(type, "filter-redirector")) { return false; }