diff options
Diffstat (limited to 'src/osmo_ss7.c')
| -rw-r--r-- | src/osmo_ss7.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/osmo_ss7.c b/src/osmo_ss7.c index f8633b6..e8a6918 100644 --- a/src/osmo_ss7.c +++ b/src/osmo_ss7.c @@ -838,6 +838,48 @@ void osmo_ss7_route_destroy(struct osmo_ss7_route *rt) talloc_free(rt); } +/* count number of consecutive leading (MSB) bits that are '1' */ +static unsigned int count_leading_one_bits(uint32_t inp, unsigned int nbits) +{ + unsigned int i; + + for (i = 0; i < nbits; i++) { + if (!(inp & (1 << (nbits-1-i)))) + return i; + } + return i; +} + +/* determine the mask length in number of bits; negative if non-consecutive mask */ +static int u32_masklen(uint32_t mask, unsigned int nbits) +{ + unsigned int i; + unsigned int leading_one_bits = count_leading_one_bits(mask, nbits); + + /* are there any bits set after the initial bits? */ + for (i = leading_one_bits; i < nbits; i++) { + if (mask & (1 << (nbits-1-i))) + return -1; /* not a simple prefix mask */ + } + return leading_one_bits; +} + +const char *osmo_ss7_route_print(const struct osmo_ss7_route *rt) +{ + const struct osmo_ss7_instance *inst = rt->rtable->inst; + unsigned int pc_width = osmo_ss7_pc_width(&inst->cfg.pc_fmt); + static char buf[64]; + int rc = u32_masklen(rt->cfg.mask, pc_width); + + if (rc < 0) + snprintf(buf, sizeof(buf), "%s/%s", osmo_ss7_pointcode_print(inst, rt->cfg.pc), + osmo_ss7_pointcode_print2(inst, rt->cfg.mask)); + else + snprintf(buf, sizeof(buf), "%s/%u", osmo_ss7_pointcode_print(inst, rt->cfg.pc), rc); + return buf; +} + + /*********************************************************************** * SS7 Application Server ***********************************************************************/ |