diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/filter-mirror.c | 248 |
1 files changed, 246 insertions, 2 deletions
diff --git a/net/filter-mirror.c b/net/filter-mirror.c index 78969e8026..c0c4dc60b6 100644 --- a/net/filter-mirror.c +++ b/net/filter-mirror.c @@ -27,12 +27,23 @@ #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, @@ -69,6 +80,96 @@ 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("serious error: oversized packet received."); + 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, @@ -91,6 +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); @@ -100,13 +222,26 @@ 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_add_handlers(s->chr_in, NULL, NULL, NULL, NULL); + 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); if (!s->outdev) { error_setg(errp, "filter filter mirror needs 'outdev' " - "property set"); + "property set"); return; } @@ -123,6 +258,48 @@ 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, "'indev' and 'outdev' could not be same " + "for filter redirector"); + 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); @@ -132,6 +309,31 @@ 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); @@ -148,17 +350,41 @@ filter_mirror_set_outdev(Object *obj, const char *value, Error **errp) s->outdev = g_strdup(value); if (!s->outdev) { error_setg(errp, "filter filter mirror needs 'outdev' " - "property set"); + "property set"); return; } } +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); @@ -166,6 +392,23 @@ 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, @@ -178,6 +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); |