From 66a5b93dee386bc2f57033a150341752923b8b41 Mon Sep 17 00:00:00 2001 From: Gerard Garcia Date: Tue, 14 Jun 2016 16:45:44 +0200 Subject: [PATCH 13/13] Add printing support for vsockmon devices. Print Linux 4.12 vsockmon captures: # modprobe vsockmon # ip link add type vsockmon # ip link set vsockmon0 up # tcpdump -i vsockmon0 16:25:24.987917 VIRTIO 3.1025 > 2.1234 CONNECT, length 76 16:25:24.987963 VIRTIO 2.1234 > 3.1025 CONNECT, length 76 16:25:26.568271 VIRTIO 3.1025 > 2.1234 PAYLOAD, length 82 16:25:26.568512 VIRTIO 2.1234 > 3.1025 CONTROL, length 76 16:25:28.411335 VIRTIO 3.1025 > 2.1234 DISCONNECT, length 76 16:25:28.411628 VIRTIO 2.1234 > 3.1025 DISCONNECT, length 76 For more information about vsock see: http://wiki.qemu.org/Features/VirtioVsock --- Makefile.in | 1 + netdissect.h | 1 + print-vsock.c | 243 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ print.c | 3 + 4 files changed, 248 insertions(+) create mode 100644 print-vsock.c diff --git a/Makefile.in b/Makefile.in index 0941f0e..a301878 100644 --- a/Makefile.in +++ b/Makefile.in @@ -226,6 +226,7 @@ LIBNETDISSECT_SRC=\ print-vjc.c \ print-vqp.c \ print-vrrp.c \ + print-vsock.c \ print-vtp.c \ print-vxlan.c \ print-vxlan-gpe.c \ diff --git a/netdissect.h b/netdissect.h index 089b040..c89fcf1 100644 --- a/netdissect.h +++ b/netdissect.h @@ -444,6 +444,7 @@ extern u_int symantec_if_print IF_PRINTER_ARGS; extern u_int token_if_print IF_PRINTER_ARGS; extern u_int usb_linux_48_byte_print IF_PRINTER_ARGS; extern u_int usb_linux_64_byte_print IF_PRINTER_ARGS; +extern u_int vsock_print IF_PRINTER_ARGS; /* * Structure passed to some printers to allow them to print diff --git a/print-vsock.c b/print-vsock.c new file mode 100644 index 0000000..fc5694d --- /dev/null +++ b/print-vsock.c @@ -0,0 +1,243 @@ +/* + * Copyright (c) 2016 Gerard Garcia + * Copyright (c) 2017 Red Hat, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. The names of the authors may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +/* \summary: Linux vsock printer */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include +#include + +#include "netdissect.h" +#include "extract.h" + +static const char tstr[] = " [|vsock]"; + +enum af_vsockmon_transport { + AF_VSOCK_TRANSPORT_UNKNOWN = 0, + AF_VSOCK_TRANSPORT_NO_INFO = 1, /* No transport information */ + AF_VSOCK_TRANSPORT_VIRTIO = 2, /* Virtio transport header */ +}; + +static const struct tok vsock_transport[] = { + {AF_VSOCK_TRANSPORT_UNKNOWN, "UNKNOWN"}, + {AF_VSOCK_TRANSPORT_NO_INFO, "NO_INFO"}, + {AF_VSOCK_TRANSPORT_VIRTIO, "VIRTIO"}, + { 0, NULL } +}; + +enum af_vsockmon_op { + AF_VSOCK_OP_UNKNOWN = 0, + AF_VSOCK_OP_CONNECT = 1, + AF_VSOCK_OP_DISCONNECT = 2, + AF_VSOCK_OP_CONTROL = 3, + AF_VSOCK_OP_PAYLOAD = 4, +}; + +static const struct tok vsock_op[] = { + {AF_VSOCK_OP_UNKNOWN, "UNKNOWN"}, + {AF_VSOCK_OP_CONNECT, "CONNECT"}, + {AF_VSOCK_OP_DISCONNECT, "DISCONNECT"}, + {AF_VSOCK_OP_CONTROL, "CONTROL"}, + {AF_VSOCK_OP_PAYLOAD, "PAYLOAD"}, + { 0, NULL } +}; + +enum virtio_vsock_type { + VIRTIO_VSOCK_TYPE_STREAM = 1, +}; + +static const struct tok virtio_type[] = { + {VIRTIO_VSOCK_TYPE_STREAM, "STREAM"}, + { 0, NULL } +}; + +enum virtio_vsock_op { + VIRTIO_VSOCK_OP_INVALID = 0, + VIRTIO_VSOCK_OP_REQUEST = 1, + VIRTIO_VSOCK_OP_RESPONSE = 2, + VIRTIO_VSOCK_OP_RST = 3, + VIRTIO_VSOCK_OP_SHUTDOWN = 4, + VIRTIO_VSOCK_OP_RW = 5, + VIRTIO_VSOCK_OP_CREDIT_UPDATE = 6, + VIRTIO_VSOCK_OP_CREDIT_REQUEST = 7, +}; + +static const struct tok virtio_op[] = { + {VIRTIO_VSOCK_OP_INVALID, "INVALID"}, + {VIRTIO_VSOCK_OP_REQUEST, "REQUEST"}, + {VIRTIO_VSOCK_OP_RESPONSE, "RESPONSE"}, + {VIRTIO_VSOCK_OP_RST, "RST"}, + {VIRTIO_VSOCK_OP_SHUTDOWN, "SHUTDOWN"}, + {VIRTIO_VSOCK_OP_RW, "RW"}, + {VIRTIO_VSOCK_OP_CREDIT_UPDATE, "CREDIT UPDATE"}, + {VIRTIO_VSOCK_OP_CREDIT_REQUEST, "CREDIT REQUEST"}, + { 0, NULL } +}; + +/* All fields are little-endian */ + +struct virtio_vsock_hdr { + uint64_t src_cid; + uint64_t dst_cid; + uint32_t src_port; + uint32_t dst_port; + uint32_t len; + uint16_t type; /* enum virtio_vsock_type */ + uint16_t op; /* enum virtio_vsock_op */ + uint32_t flags; + uint32_t buf_alloc; + uint32_t fwd_cnt; +} UNALIGNED; + +struct af_vsockmon_hdr { + uint64_t src_cid; + uint64_t dst_cid; + uint32_t src_port; + uint32_t dst_port; + uint16_t op; /* enum af_vsockmon_op */ + uint16_t transport; /* enum af_vosckmon_transport */ + uint16_t len; /* size of transport header */ + uint8_t reserved[2]; +}; + +static void +vsock_virtio_hdr_print(netdissect_options *ndo, const struct virtio_vsock_hdr *hdr) +{ + uint16_t u16_v; + uint32_t u32_v; + + u32_v = EXTRACT_LE_32BITS(&hdr->len); + ND_PRINT((ndo, "len %u", u32_v)); + + u16_v = EXTRACT_LE_16BITS(&hdr->type); + ND_PRINT((ndo, ", type %s", + tok2str(virtio_type, "Invalid type (%hu)", u16_v))); + + u16_v = EXTRACT_LE_16BITS(&hdr->op); + ND_PRINT((ndo, ", op %s", + tok2str(virtio_op, "Invalid op (%hu)", u16_v))); + + u32_v = EXTRACT_LE_32BITS(&hdr->flags); + ND_PRINT((ndo, ", flags %x", u32_v)); + + u32_v = EXTRACT_LE_32BITS(&hdr->buf_alloc); + ND_PRINT((ndo, ", buf_alloc %u", u32_v)); + + u32_v = EXTRACT_LE_32BITS(&hdr->fwd_cnt); + ND_PRINT((ndo, ", fwd_cnt %u", u32_v)); +} + +static size_t +vsock_transport_hdr_size(uint16_t transport) +{ + switch (transport) { + case AF_VSOCK_TRANSPORT_VIRTIO: + return sizeof(struct virtio_vsock_hdr); + default: + return 0; + } +} + +static void +vsock_transport_hdr_print(netdissect_options *ndo, uint16_t transport, + const u_char *p, const u_int len) +{ + size_t transport_size = vsock_transport_hdr_size(transport); + const void *hdr; + + if (len < sizeof(struct af_vsockmon_hdr) + transport_size) + return; + + hdr = p + sizeof(struct af_vsockmon_hdr); + switch (transport) { + case AF_VSOCK_TRANSPORT_VIRTIO: + ND_PRINT((ndo, " (")); + vsock_virtio_hdr_print(ndo, hdr); + ND_PRINT((ndo, ")")); + break; + default: + break; + } +} + +static void +vsock_hdr_print(netdissect_options *ndo, const u_char *p, const u_int len) +{ + uint16_t hdr_transport, hdr_op; + uint32_t hdr_src_port, hdr_dst_port; + uint64_t hdr_src_cid, hdr_dst_cid; + size_t total_hdr_size; + + const struct af_vsockmon_hdr *hdr = (struct af_vsockmon_hdr *)p; + + hdr_transport = EXTRACT_LE_16BITS(&hdr->transport); + ND_PRINT((ndo, "%s", + tok2str(vsock_transport, "Invalid transport (%u)", + hdr_transport))); + + /* If verbose level is more than 0 print transport details */ + if (ndo->ndo_vflag) { + vsock_transport_hdr_print(ndo, hdr_transport, p, len); + ND_PRINT((ndo, "\n\t")); + } else + ND_PRINT((ndo, " ")); + + hdr_src_cid = EXTRACT_LE_64BITS(&hdr->src_cid); + hdr_dst_cid = EXTRACT_LE_64BITS(&hdr->dst_cid); + hdr_src_port = EXTRACT_LE_32BITS(&hdr->src_port); + hdr_dst_port = EXTRACT_LE_32BITS(&hdr->dst_port); + hdr_op = EXTRACT_LE_16BITS(&hdr->op); + ND_PRINT((ndo, "%lu.%hu > %lu.%hu %s, length %u", + hdr_src_cid, hdr_src_port, + hdr_dst_cid, hdr_dst_port, + tok2str(vsock_op, " invalid op (%u)", hdr_op), + len)); + + /* If debug level is more than 1 print payload contents */ + total_hdr_size = sizeof(struct af_vsockmon_hdr) + + vsock_transport_hdr_size(hdr_transport); + if (ndo->ndo_vflag > 1 && + hdr_op == AF_VSOCK_OP_PAYLOAD && + len > total_hdr_size) { + const u_char *payload = p + total_hdr_size; + + ND_PRINT((ndo, "\n")); + print_unknown_data(ndo, payload, "\t", len - total_hdr_size); + } +} + +u_int +vsock_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *cp) +{ + u_int len = h->len; + + if (len < sizeof(struct af_vsockmon_hdr)) + ND_PRINT((ndo, "%s", tstr)); + else + vsock_hdr_print(ndo, cp, len); + + return len; +} diff --git a/print.c b/print.c index c76f344..1945cfd 100644 --- a/print.c +++ b/print.c @@ -220,6 +220,9 @@ static const struct printer printers[] = { #ifdef DLT_PPP_SERIAL { ppp_hdlc_if_print, DLT_PPP_SERIAL }, #endif +#ifdef DLT_VSOCK + { vsock_print, DLT_VSOCK }, +#endif { NULL, 0 }, }; -- 2.13.5