/*
* Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
* Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
- * Copyright (c) 2016-2017 The strace developers.
+ * Copyright (c) 2016-2018 The strace developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
*/
#include "defs.h"
+#include <endian.h>
#include "netlink.h"
+#include "nlattr.h"
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <linux/sock_diag.h>
+#include "static_assert.h"
+
+#include "xlat/netlink_sk_meminfo_indices.h"
static bool
fetch_nlattr(struct tcb *const tcp, struct nlattr *const nlattr,
- const kernel_ulong_t addr, const kernel_ulong_t len)
+ const kernel_ulong_t addr, const unsigned int len,
+ const bool in_array)
{
if (len < sizeof(struct nlattr)) {
- printstrn(tcp, addr, len);
+ printstr_ex(tcp, addr, len, QUOTE_FORCE_HEX);
return false;
}
- if (umove_or_printaddr(tcp, addr, nlattr))
- return false;
+ if (tfetch_obj(tcp, addr, nlattr))
+ return true;
- return true;
+ if (in_array) {
+ tprints("...");
+ printaddr_comment(addr);
+ } else {
+ printaddr(addr);
+ }
+
+ return false;
}
static void
const struct xlat *const table,
const char *const dflt)
{
+ static_assert(NLA_TYPE_MASK == ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER),
+ "wrong NLA_TYPE_MASK");
+
tprintf("{nla_len=%u, nla_type=", nla->nla_len);
- if (nla->nla_type & NLA_F_NESTED)
- tprints("NLA_F_NESTED|");
- if (nla->nla_type & NLA_F_NET_BYTEORDER)
- tprints("NLA_F_NET_BYTEORDER|");
+ if (nla->nla_type & NLA_F_NESTED) {
+ print_xlat(NLA_F_NESTED);
+ tprints("|");
+ }
+ if (nla->nla_type & NLA_F_NET_BYTEORDER) {
+ print_xlat(NLA_F_NET_BYTEORDER);
+ tprints("|");
+ }
printxval(table, nla->nla_type & NLA_TYPE_MASK, dflt);
tprints("}");
}
static void
-decode_nlattr_with_data(struct tcb *tcp,
+decode_nlattr_with_data(struct tcb *const tcp,
const struct nlattr *const nla,
- kernel_ulong_t addr,
- kernel_ulong_t len,
+ const kernel_ulong_t addr,
+ const unsigned int len,
const struct xlat *const table,
- const char *const dflt)
+ const char *const dflt,
+ const nla_decoder_t *const decoders,
+ const unsigned int size,
+ const void *const opaque_data)
{
- const unsigned int nla_len = nla->nla_len > len ? len : nla->nla_len;
+ const unsigned int nla_len = MIN(nla->nla_len, len);
if (nla_len > NLA_HDRLEN)
tprints("{");
print_nlattr(nla, table, dflt);
if (nla_len > NLA_HDRLEN) {
+ const unsigned int idx = size ? nla->nla_type : 0;
+
tprints(", ");
- printstrn(tcp, addr + NLA_HDRLEN, nla_len - NLA_HDRLEN);
+ if (!decoders
+ || (size && idx >= size)
+ || !decoders[idx]
+ || !decoders[idx](
+ tcp, addr + NLA_HDRLEN,
+ nla_len - NLA_HDRLEN,
+ size ? opaque_data
+ : (const void *) (uintptr_t) nla->nla_type)
+ )
+ printstr_ex(tcp, addr + NLA_HDRLEN,
+ nla_len - NLA_HDRLEN, QUOTE_FORCE_HEX);
tprints("}");
}
}
void
decode_nlattr(struct tcb *const tcp,
kernel_ulong_t addr,
- kernel_ulong_t len,
+ unsigned int len,
const struct xlat *const table,
- const char *const dflt)
+ const char *const dflt,
+ const nla_decoder_t *const decoders,
+ const unsigned int size,
+ const void *const opaque_data)
{
struct nlattr nla;
- bool print_array = false;
+ bool is_array = false;
unsigned int elt;
- for (elt = 0; fetch_nlattr(tcp, &nla, addr, len); elt++) {
+ if (decoders && !size && opaque_data)
+ error_func_msg("[xlat %p, dflt \"%s\", decoders %p] "
+ "size is zero (going to pass nla_type as "
+ "decoder argument), but opaque data (%p) is not "
+ "- will be ignored",
+ table, dflt, decoders, opaque_data);
+
+ for (elt = 0; fetch_nlattr(tcp, &nla, addr, len, is_array); elt++) {
if (abbrev(tcp) && elt == max_strlen) {
tprints("...");
break;
}
- const unsigned long nla_len = NLA_ALIGN(nla.nla_len);
+ const unsigned int nla_len = NLA_ALIGN(nla.nla_len);
kernel_ulong_t next_addr = 0;
- kernel_ulong_t next_len = 0;
+ unsigned int next_len = 0;
if (nla.nla_len >= NLA_HDRLEN) {
next_len = (len >= nla_len) ? len - nla_len : 0;
next_addr = addr + nla_len;
}
- if (!print_array && next_addr) {
+ if (!is_array && next_addr) {
tprints("[");
- print_array = true;
+ is_array = true;
}
- decode_nlattr_with_data(tcp, &nla, addr, len, table, dflt);
+ decode_nlattr_with_data(tcp, &nla, addr, len, table, dflt,
+ decoders, size, opaque_data);
if (!next_addr)
break;
len = next_len;
}
- if (print_array) {
+ if (is_array) {
tprints("]");
}
}
+
+bool
+decode_nla_str(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+ printstr_ex(tcp, addr, len, QUOTE_0_TERMINATED);
+
+ return true;
+}
+
+bool
+decode_nla_strn(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+ printstrn(tcp, addr, len);
+
+ return true;
+}
+
+bool
+decode_nla_meminfo(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+ uint32_t mem;
+ const size_t nmemb = len / sizeof(mem);
+
+ if (!nmemb)
+ return false;
+
+ unsigned int count = 0;
+ print_array_ex(tcp, addr, nmemb, &mem, sizeof(mem),
+ tfetch_mem, print_uint32_array_member, &count,
+ PAF_PRINT_INDICES | PAF_INDEX_XLAT_VALUE_INDEXED
+ | XLAT_STYLE_FMT_U,
+ ARRSZ_PAIR(netlink_sk_meminfo_indices),
+ "SK_MEMINFO_???");
+
+ return true;
+}
+
+bool
+decode_nla_fd(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+ int fd;
+
+ if (len < sizeof(fd))
+ return false;
+ else if (!umove_or_printaddr(tcp, addr, &fd))
+ printfd(tcp, fd);
+
+ return true;
+}
+
+bool
+decode_nla_ifindex(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+ uint32_t ifindex;
+
+ if (len < sizeof(ifindex))
+ return false;
+ else if (!umove_or_printaddr(tcp, addr, &ifindex))
+ print_ifindex(ifindex);
+
+ return true;
+}
+
+bool
+decode_nla_xval(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+ const struct decode_nla_xlat_opts * const opts = opaque_data;
+ union {
+ uint64_t val;
+ uint8_t bytes[sizeof(uint64_t)];
+ } data;
+ const size_t bytes_offs = is_bigendian ? sizeof(data) - len : 0;
+
+ data.val = 0;
+
+ if (len > sizeof(data))
+ return false;
+ else if (!umoven_or_printaddr(tcp, addr, len, data.bytes + bytes_offs))
+ {
+ if (opts->process_fn)
+ data.val = opts->process_fn(data.val);
+ if (opts->prefix)
+ tprints(opts->prefix);
+ printxval_dispatch_ex(opts->xlat, opts->xlat_size, data.val,
+ opts->dflt, opts->xt, opts->style);
+ if (opts->suffix)
+ tprints(opts->suffix);
+ }
+
+ return true;
+}
+
+static uint64_t
+process_host_order(uint64_t val)
+{
+ return ntohs(val);
+}
+
+bool
+decode_nla_ether_proto(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+ const struct decode_nla_xlat_opts opts = {
+ .xlat = ethernet_protocols,
+ .xlat_size = ethernet_protocols_size,
+ .dflt = "ETHER_P_???",
+ .xt = XT_SORTED,
+ .prefix = "htons(",
+ .suffix = ")",
+ .process_fn = process_host_order,
+ };
+
+ return decode_nla_xval(tcp, addr, len, &opts);
+}
+
+bool
+decode_nla_ip_proto(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+ const struct decode_nla_xlat_opts opts = {
+ .xlat = inet_protocols,
+ .xlat_size = inet_protocols_size,
+ .xt = XT_SORTED,
+ .dflt = "IPPROTO_???",
+ };
+
+ return decode_nla_xval(tcp, addr, len, &opts);
+}
+
+bool
+decode_nla_flags(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+ const struct decode_nla_xlat_opts * const opts = opaque_data;
+ union {
+ uint64_t flags;
+ uint8_t bytes[sizeof(uint64_t)];
+ } data = { .flags = 0 };
+ const size_t bytes_offs = is_bigendian ? sizeof(data) - len : 0;
+
+ if (opts->xt == XT_INDEXED)
+ error_func_msg("indexed xlats are currently incompatible with "
+ "printflags");
+
+ if (len > sizeof(data))
+ return false;
+ else if (!umoven_or_printaddr(tcp, addr, len, data.bytes + bytes_offs))
+ {
+ if (opts->process_fn)
+ data.flags = opts->process_fn(data.flags);
+ if (opts->prefix)
+ tprints(opts->prefix);
+ printflags_ex(data.flags, opts->dflt, opts->style, opts->xlat,
+ NULL);
+ if (opts->suffix)
+ tprints(opts->suffix);
+ }
+
+ return true;
+}
+
+bool
+decode_nla_be16(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+ uint16_t num;
+
+ if (len < sizeof(num))
+ return false;
+ else if (!umove_or_printaddr(tcp, addr, &num))
+ tprintf("htons(%u)", ntohs(num));
+
+ return true;
+}
+
+bool
+decode_nla_be64(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+#if defined HAVE_BE64TOH || defined be64toh
+ uint64_t num;
+
+ if (len < sizeof(num))
+ return false;
+ else if (!umove_or_printaddr(tcp, addr, &num))
+ tprintf("htobe64(%" PRIu64 ")", be64toh(num));
+
+ return true;
+#else
+ return false;
+#endif
+}
+
+#define DECODE_NLA_INTEGER(name, type, fmt) \
+bool \
+decode_nla_ ## name(struct tcb *const tcp, \
+ const kernel_ulong_t addr, \
+ const unsigned int len, \
+ const void *const opaque_data) \
+{ \
+ type num; \
+ \
+ if (len < sizeof(num)) \
+ return false; \
+ if (!umove_or_printaddr(tcp, addr, &num)) \
+ tprintf(fmt, num); \
+ return true; \
+}
+
+DECODE_NLA_INTEGER(x8, uint8_t, "%#" PRIx8)
+DECODE_NLA_INTEGER(x16, uint16_t, "%#" PRIx16)
+DECODE_NLA_INTEGER(x32, uint32_t, "%#" PRIx32)
+DECODE_NLA_INTEGER(x64, uint64_t, "%#" PRIx64)
+DECODE_NLA_INTEGER(u8, uint8_t, "%" PRIu8)
+DECODE_NLA_INTEGER(u16, uint16_t, "%" PRIu16)
+DECODE_NLA_INTEGER(u32, uint32_t, "%" PRIu32)
+DECODE_NLA_INTEGER(u64, uint64_t, "%" PRIu64)
+DECODE_NLA_INTEGER(s8, int8_t, "%" PRId8)
+DECODE_NLA_INTEGER(s16, int16_t, "%" PRId16)
+DECODE_NLA_INTEGER(s32, int32_t, "%" PRId32)
+DECODE_NLA_INTEGER(s64, int64_t, "%" PRId64)
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