router: use enum to specify order and index of iov struct

Improve code maintainability by using enum to order and index iov struct

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

diff --git a/src/router.c b/src/router.c
index 85ca6b0ef66f31e53718ec14a6b94c2bd42f8aa3..0463d6875eef211b66e51f6168889fbbb0e473b6 100644 (file)
--- a/src/router.c
+++ b/src/router.c
@@ -38,7 +38,6 @@ static void sigusr1_refresh(int signal);
 static struct odhcpd_event router_event = {.uloop = {.fd = -1}, .handle_dgram = handle_icmpv6, };
 
 static FILE *fp_route = NULL;
-#define RA_IOV_LEN 7
 
 #define TIME_LEFT(t1, now) ((t1) != UINT32_MAX ? (t1) - (now) : UINT32_MAX)
 
@@ -255,6 +254,17 @@ static uint16_t calc_ra_lifetime(struct interface *iface, uint32_t maxival)
        return lifetime;
 }
 
+enum {
+       IOV_RA_ADV=0,
+       IOV_RA_PFXS,
+       IOV_RA_ROUTES,
+       IOV_RA_DNS,
+       IOV_RA_DNS_ADDR,
+       IOV_RA_SEARCH,
+       IOV_RA_ADV_INTERVAL,
+       IOV_RA_TOTAL,
+};
+
 // Router Advert server mode
 static uint64_t send_router_advert(struct interface *iface, const struct in6_addr *from)
 {
@@ -529,14 +539,14 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add
                .data = {0, 0, (maxival*1000) >> 24, (maxival*1000) >> 16, (maxival*1000) >> 8, maxival*1000}
        };
 
-       struct iovec iov[RA_IOV_LEN] = {
-                       {&adv, sizeof(adv)},
-                       {pfxs, pfxs_cnt * sizeof(*pfxs)},
-                       {routes, routes_cnt * sizeof(*routes)},
-                       {&dns, (dns_cnt) ? sizeof(dns) : 0},
-                       {dns_addr, dns_cnt * sizeof(*dns_addr)},
-                       {search, search->len * 8},
-                       {&adv_interval, adv_interval.len * 8}};
+       struct iovec iov[IOV_RA_TOTAL] = {
+                       [IOV_RA_ADV] = {&adv, sizeof(adv)},
+                       [IOV_RA_PFXS] = {pfxs, pfxs_cnt * sizeof(*pfxs)},
+                       [IOV_RA_ROUTES] = {routes, routes_cnt * sizeof(*routes)},
+                       [IOV_RA_DNS] = {&dns, (dns_cnt) ? sizeof(dns) : 0},
+                       [IOV_RA_DNS_ADDR] = {dns_addr, dns_cnt * sizeof(*dns_addr)},
+                       [IOV_RA_SEARCH] = {search, search->len * 8},
+                       [IOV_RA_ADV_INTERVAL] = {&adv_interval, adv_interval.len * 8}};
        struct sockaddr_in6 dest = {AF_INET6, 0, 0, ALL_IPV6_NODES, 0};
 
        if (from && !IN6_IS_ADDR_UNSPECIFIED(from))