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dhcpv6: Use for loop instead of goto to avoid false positive cppcheck warning

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cppcheck 2.16.0 reports:

dhcpv6.c:334:14: style: The comparison 'ia_type == 3' is always true. [knownConditionTrueFalse]
 if (ia_type == OPT_IA_NA) {
             ^
dhcpv6.c:306:12: note: 'ia_type' is assigned value '3' here.
 ia_type = OPT_IA_NA;
           ^
dhcpv6.c:334:14: note: The comparison 'ia_type == 3' is always true.
 if (ia_type == OPT_IA_NA) {
             ^

this is not really the case as we set ia_type to OPT_IA_TA and then
jump back.

Anyway, there's no particular reason to use a goto here: add a trivial
foreach() macro to go through elements of an array and use it instead.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefano Brivio 2024-11-07 17:47:08 +01:00
parent 78da088f7b
commit 5f5e814cfc
2 changed files with 26 additions and 28 deletions
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51
dhcpv6.c
View file

@ -296,47 +296,42 @@ static struct opt_hdr *dhcpv6_opt(const struct pool *p, size_t *offset,
static struct opt_hdr *dhcpv6_ia_notonlink(const struct pool *p,
struct in6_addr *la)
{
int ia_types[2] = { OPT_IA_NA, OPT_IA_TA }, *ia_type;
const struct opt_ia_addr *opt_addr;
char buf[INET6_ADDRSTRLEN];
struct in6_addr req_addr;
const struct opt_hdr *h;
struct opt_hdr *ia;
size_t offset;
int ia_type;
ia_type = OPT_IA_NA;
ia_ta:
offset = 0;
while ((ia = dhcpv6_opt(p, &offset, ia_type))) {
if (ntohs(ia->l) < OPT_VSIZE(ia_na))
return NULL;
offset += sizeof(struct opt_ia_na);
while ((h = dhcpv6_opt(p, &offset, OPT_IAAADR))) {
const struct opt_ia_addr *opt_addr;
if (ntohs(h->l) != OPT_VSIZE(ia_addr))
foreach(ia_type, ia_types) {
offset = 0;
while ((ia = dhcpv6_opt(p, &offset, *ia_type))) {
if (ntohs(ia->l) < OPT_VSIZE(ia_na))
return NULL;
opt_addr = (const struct opt_ia_addr *)h;
req_addr = opt_addr->addr;
if (!IN6_ARE_ADDR_EQUAL(la, &req_addr)) {
info("DHCPv6: requested address %s not on link",
inet_ntop(AF_INET6, &req_addr,
buf, sizeof(buf)));
return ia;
}
offset += sizeof(struct opt_ia_na);
offset += sizeof(struct opt_ia_addr);
while ((h = dhcpv6_opt(p, &offset, OPT_IAAADR))) {
if (ntohs(h->l) != OPT_VSIZE(ia_addr))
return NULL;
opt_addr = (const struct opt_ia_addr *)h;
req_addr = opt_addr->addr;
if (!IN6_ARE_ADDR_EQUAL(la, &req_addr))
goto err;
offset += sizeof(struct opt_ia_addr);
}
}
}
if (ia_type == OPT_IA_NA) {
ia_type = OPT_IA_TA;
goto ia_ta;
}
return NULL;
err:
info("DHCPv6: requested address %s not on link",
inet_ntop(AF_INET6, &req_addr, buf, sizeof(buf)));
return ia;
}
/**

3
util.h
View file

@ -102,6 +102,9 @@
#define ARRAY_SIZE(a) ((int)(sizeof(a) / sizeof((a)[0])))
#define foreach(item, array) \
for ((item) = (array); (item) - (array) < ARRAY_SIZE(array); (item)++)
#define IN_INTERVAL(a, b, x) ((x) >= (a) && (x) <= (b))
#define FD_PROTO(x, proto) \
(IN_INTERVAL(c->proto.fd_min, c->proto.fd_max, (x)))