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RAdv: Extract prefix option preparation

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Put the prefix option preparation into a separate function. We're going
to reuse that bit of code.
This commit is contained in:
Michal 'vorner' Vaner 2017-08-09 16:00:16 +02:00 committed by Ondrej Zajicek (work)
parent e7ed9ecba7
commit 3ac5d1ce4c
1 changed files with 33 additions and 21 deletions
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50
proto/radv/packets.c
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@ -235,6 +235,36 @@ radv_prepare_dnssl(struct radv_iface *ifa, list *dnssl_list, char **buf, char *b
return -1; return -1;
} }
static int
radv_prepare_prefix(struct radv_iface *ifa, struct radv_prefix_config *pc,
struct ifa *addr, char **buf, char *bufend)
{
struct radv_opt_prefix *op = (void *) *buf;
if (*buf + sizeof(*op) > bufend)
{
log(L_WARN "%s: Too many prefixes on interface %s", ifa->ra->p.name,
ifa->iface->name);
return -1;
}
op->type = OPT_PREFIX;
op->length = 4;
op->pxlen = addr->pxlen;
op->flags = (pc->onlink ? OPT_PX_ONLINK : 0) |
(pc->autonomous ? OPT_PX_AUTONOMOUS : 0);
op->valid_lifetime = (ifa->ra->active || !pc->valid_lifetime_sensitive) ?
htonl(pc->valid_lifetime) : 0;
op->preferred_lifetime = (ifa->ra->active || !pc->preferred_lifetime_sensitive) ?
htonl(pc->preferred_lifetime) : 0;
op->reserved = 0;
op->prefix = addr->prefix;
ipa_hton(op->prefix);
*buf += sizeof(*op);
return 0;
}
static void static void
radv_prepare_ra(struct radv_iface *ifa) radv_prepare_ra(struct radv_iface *ifa)
{ {
@ -279,26 +309,8 @@ radv_prepare_ra(struct radv_iface *ifa)
if (!pc || pc->skip) if (!pc || pc->skip)
continue; continue;
if (buf + sizeof(struct radv_opt_prefix) > bufend) if (radv_prepare_prefix(ifa, pc, addr, &buf, bufend) < 0)
{
log(L_WARN "%s: Too many prefixes on interface %s", p->p.name, ifa->iface->name);
goto done; goto done;
}
struct radv_opt_prefix *op = (void *) buf;
op->type = OPT_PREFIX;
op->length = 4;
op->pxlen = addr->pxlen;
op->flags = (pc->onlink ? OPT_PX_ONLINK : 0) |
(pc->autonomous ? OPT_PX_AUTONOMOUS : 0);
op->valid_lifetime = (p->active || !pc->valid_lifetime_sensitive) ?
htonl(pc->valid_lifetime) : 0;
op->preferred_lifetime = (p->active || !pc->preferred_lifetime_sensitive) ?
htonl(pc->preferred_lifetime) : 0;
op->reserved = 0;
op->prefix = addr->prefix;
ipa_hton(op->prefix);
buf += sizeof(*op);
} }
if (! ic->rdnss_local) if (! ic->rdnss_local)