err log: fully log MS supported A5 algos on mismatch

Change-Id: Icb18e0f0bb420de066e7eb8fc683f192ba2a7368
changes/04/12404/13
Neels Hofmeyr 4 years ago committed by Harald Welte
parent a725970d85
commit 5769d36b44
  1. 40
      src/libmsc/gsm_04_08.c

@ -118,6 +118,41 @@ static bool classmark_is_r99(struct gsm_classmark *cm)
return classmark2_is_r99(cm->classmark2, cm->classmark2_len);
}
static const char *classmark_a5_name(const struct gsm_classmark *cm)
{
static char buf[128];
char cm1[42];
char cm2[42];
char cm3[42];
if (cm->classmark1_set)
snprintf(cm1, sizeof(cm1), "cm1{a5/1=%s}",
cm->classmark1.a5_1 ? "not-supported":"supported" /* inverted logic */);
else
snprintf(cm1, sizeof(cm1), "no-cm1");
if (cm->classmark2_len >= 3)
snprintf(cm2, sizeof(cm2), " cm2{0x%x=%s%s}",
cm->classmark2[2],
cm->classmark2[2] & 0x1 ? " A5/2" : "",
cm->classmark2[2] & 0x2 ? " A5/3" : "");
else
snprintf(cm2, sizeof(cm2), " no-cm2");
if (cm->classmark3_len >= 1)
snprintf(cm3, sizeof(cm3), " cm3{0x%x=%s%s%s%s}",
cm->classmark3[0],
cm->classmark3[0] & (1 << 0) ? " A5/4" : "",
cm->classmark3[0] & (1 << 1) ? " A5/5" : "",
cm->classmark3[0] & (1 << 2) ? " A5/6" : "",
cm->classmark3[0] & (1 << 3) ? " A5/7" : "");
else
snprintf(cm3, sizeof(cm3), " no-cm3");
snprintf(buf, sizeof(buf), "%s%s%s", cm1, cm2, cm3);
return buf;
}
/* Determine if the given CLASSMARK (1/2/3) value permits a given A5/n cipher.
* Return 1 when the given A5/n is permitted, 0 when not, and negative if the respective MS CLASSMARK is
* not known, where the negative number indicates the classmark type: -2 means Classmark 2 is not
@ -1617,8 +1652,9 @@ int ran_conn_geran_set_cipher_mode(struct ran_conn *conn, bool umts_aka, bool re
if (ei.perm_algo_len == 0) {
LOGP(DMM, LOGL_ERROR, "%s: cannot start ciphering, no intersection "
"between MSC-configured and MS-supported A5 algorithms\n",
vlr_subscr_name(conn->vsub));
"between MSC-configured and MS-supported A5 algorithms. MSC: %x MS: %s\n",
vlr_subscr_name(conn->vsub), net->a5_encryption_mask,
classmark_a5_name(&conn->vsub->classmark));
return -ENOTSUP;
}

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