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/*
* Copyright (c) 2016 Gerard Garcia <nouboh@gmail.com>
* 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 "netdissect-stdinc.h"
#include <stddef.h>
#define ND_LONGJMP_FROM_TCHECK
#include "netdissect.h"
#include "extract.h"
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 {
nd_uint64_t src_cid;
nd_uint64_t dst_cid;
nd_uint32_t src_port;
nd_uint32_t dst_port;
nd_uint32_t len;
nd_uint16_t type; /* enum virtio_vsock_type */
nd_uint16_t op; /* enum virtio_vsock_op */
nd_uint32_t flags;
nd_uint32_t buf_alloc;
nd_uint32_t fwd_cnt;
};
struct af_vsockmon_hdr {
nd_uint64_t src_cid;
nd_uint64_t dst_cid;
nd_uint32_t src_port;
nd_uint32_t dst_port;
nd_uint16_t op; /* enum af_vsockmon_op */
nd_uint16_t transport; /* enum af_vosckmon_transport */
nd_uint16_t len; /* size of transport header */
nd_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 = GET_LE_U_4(hdr->len);
ND_PRINT("len %u", u32_v);
u16_v = GET_LE_U_2(hdr->type);
ND_PRINT(", type %s",
tok2str(virtio_type, "Invalid type (%hu)", u16_v));
u16_v = GET_LE_U_2(hdr->op);
ND_PRINT(", op %s",
tok2str(virtio_op, "Invalid op (%hu)", u16_v));
u32_v = GET_LE_U_4(hdr->flags);
ND_PRINT(", flags %x", u32_v);
u32_v = GET_LE_U_4(hdr->buf_alloc);
ND_PRINT(", buf_alloc %u", u32_v);
u32_v = GET_LE_U_4(hdr->fwd_cnt);
ND_PRINT(", fwd_cnt %u", u32_v);
}
/*
* This size had better fit in a u_int.
*/
static u_int
vsock_transport_hdr_size(uint16_t transport)
{
switch (transport) {
case AF_VSOCK_TRANSPORT_VIRTIO:
return (u_int)sizeof(struct virtio_vsock_hdr);
default:
return 0;
}
}
/* Returns 0 on success, -1 on truncation */
static int
vsock_transport_hdr_print(netdissect_options *ndo, uint16_t transport,
const u_char *p, const u_int caplen)
{
u_int transport_size = vsock_transport_hdr_size(transport);
const void *hdr;
if (caplen < sizeof(struct af_vsockmon_hdr) + transport_size) {
return -1;
}
hdr = p + sizeof(struct af_vsockmon_hdr);
switch (transport) {
case AF_VSOCK_TRANSPORT_VIRTIO:
ND_PRINT(" (");
vsock_virtio_hdr_print(ndo, hdr);
ND_PRINT(")");
break;
default:
break;
}
return 0;
}
static void
vsock_hdr_print(netdissect_options *ndo, const u_char *p, const u_int caplen)
{
const struct af_vsockmon_hdr *hdr = (const struct af_vsockmon_hdr *)p;
uint16_t hdr_transport, hdr_op;
uint32_t hdr_src_port, hdr_dst_port;
uint64_t hdr_src_cid, hdr_dst_cid;
u_int total_hdr_size;
int ret = 0;
hdr_transport = GET_LE_U_2(hdr->transport);
ND_PRINT("%s",
tok2str(vsock_transport, "Invalid transport (%u)",
hdr_transport));
/* If verbose level is more than 0 print transport details */
if (ndo->ndo_vflag) {
ret = vsock_transport_hdr_print(ndo, hdr_transport, p, caplen);
if (ret == 0)
ND_PRINT("\n\t");
} else
ND_PRINT(" ");
hdr_src_cid = GET_LE_U_8(hdr->src_cid);
hdr_dst_cid = GET_LE_U_8(hdr->dst_cid);
hdr_src_port = GET_LE_U_4(hdr->src_port);
hdr_dst_port = GET_LE_U_4(hdr->dst_port);
hdr_op = GET_LE_U_2(hdr->op);
ND_PRINT("%" PRIu64 ".%u > %" PRIu64 ".%u %s, length %u",
hdr_src_cid, hdr_src_port,
hdr_dst_cid, hdr_dst_port,
tok2str(vsock_op, " invalid op (%u)", hdr_op),
caplen);
if (ret < 0)
goto trunc;
/* If debug level is more than 1 print payload contents */
/* This size had better fit in a u_int */
total_hdr_size = (u_int)sizeof(struct af_vsockmon_hdr) +
vsock_transport_hdr_size(hdr_transport);
if (ndo->ndo_vflag > 1 && hdr_op == AF_VSOCK_OP_PAYLOAD) {
if (caplen > total_hdr_size) {
const u_char *payload = p + total_hdr_size;
ND_PRINT("\n");
print_unknown_data(ndo, payload, "\t",
caplen - total_hdr_size);
} else
goto trunc;
}
return;
trunc:
nd_print_trunc(ndo);
}
void
vsock_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
const u_char *cp)
{
ndo->ndo_protocol = "vsock";
ND_TCHECK_LEN(cp, sizeof(struct af_vsockmon_hdr));
ndo->ndo_ll_hdr_len += sizeof(struct af_vsockmon_hdr);
vsock_hdr_print(ndo, cp, h->caplen);
}
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