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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 V3 2/3] net/filter-mirror:Add filter-redirector func 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 --- net/filter-mirror.c | 211 ++++++++++++++++++++++++++++++++++++++++++++++++++++ qemu-options.hx | 8 ++ vl.c | 3 +- 3 files changed, 221 insertions(+), 1 deletion(-) diff --git a/net/filter-mirror.c b/net/filter-mirror.c index 4ff7619..d137168 100644 --- a/net/filter-mirror.c +++ b/net/filter-mirror.c @@ -25,11 +25,19 @@ #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 REDIRECT_HEADER_LEN sizeof(uint32_t) typedef struct MirrorState { NetFilterState parent_obj; + NetQueue *incoming_queue; + char *indev; char *outdev; + CharDriverState *chr_in; CharDriverState *chr_out; } MirrorState; @@ -67,6 +75,68 @@ err: return ret < 0 ? ret : -EIO; } +static int redirector_chr_can_read(void *opaque) +{ + return REDIRECT_HEADER_LEN; +} + +static void redirector_chr_read(void *opaque, const uint8_t *buf, int size) +{ + NetFilterState *nf = opaque; + MirrorState *s = FILTER_REDIRECTOR(nf); + uint32_t len; + int ret = 0; + uint8_t *recv_buf; + + memcpy(&len, buf, size); + if (size < REDIRECT_HEADER_LEN) { + ret = qemu_chr_fe_read_all(s->chr_in, ((uint8_t *)&len) + size, + REDIRECT_HEADER_LEN - size); + if (ret != (REDIRECT_HEADER_LEN - size)) { + error_report("filter-redirector recv size failed"); + return; + } + } + + len = ntohl(len); + + if (len > 0 && len < NET_BUFSIZE) { + recv_buf = g_malloc(len); + ret = qemu_chr_fe_read_all(s->chr_in, recv_buf, len); + if (ret != len) { + error_report("filter-redirector recv buf failed"); + g_free(recv_buf); + return; + } + + if (nf->direction == NET_FILTER_DIRECTION_ALL || + nf->direction == NET_FILTER_DIRECTION_TX) { + ret = qemu_net_queue_send(s->incoming_queue, nf->netdev, + 0, (const uint8_t *)recv_buf, len, NULL); + + if (ret < 0) { + /* + *FIXME: just report an error, let NET_FILTER_DIRECTION_RX have chance to pass + * to next filter ? + */ + error_report("filter-redirector out to guest failed"); + } + } + + if (nf->direction == NET_FILTER_DIRECTION_ALL || + nf->direction == NET_FILTER_DIRECTION_RX) { + struct iovec iov = { + .iov_base = recv_buf, + .iov_len = sizeof(recv_buf) + }; + qemu_netfilter_pass_to_next(nf->netdev->peer, 0, &iov, 1, nf); + } + g_free(recv_buf); + } else { + error_report("filter-redirector recv len failed"); + } +} + static ssize_t filter_mirror_receive_iov(NetFilterState *nf, NetClientState *sender, unsigned flags, @@ -89,6 +159,27 @@ 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); @@ -98,6 +189,18 @@ 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); @@ -121,6 +224,47 @@ 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; + } + } + + 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, NULL, nf); + s->incoming_queue = qemu_new_net_queue(qemu_netfilter_pass_to_next, 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); @@ -130,6 +274,31 @@ 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); @@ -151,12 +320,36 @@ 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); @@ -164,6 +357,23 @@ static void filter_mirror_fini(Object *obj) g_free(s->outdev); } +static void filter_redirector_fini(Object *obj) +{ + MirrorState *s = FILTER_REDIRECTOR(obj); + + 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, @@ -176,6 +386,7 @@ 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 ca27863..84584e3 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -3764,6 +3764,14 @@ 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 to be set. + @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 d68533a..c389a3f 100644 --- a/vl.c +++ b/vl.c @@ -2799,7 +2799,8 @@ 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; }