diff options
| -rw-r--r-- | conf.c | 18 | ||||
| -rw-r--r-- | ip.h | 7 | ||||
| -rw-r--r-- | util.h | 6 |
3 files changed, 22 insertions, 9 deletions
@@ -1663,9 +1663,9 @@ void conf(struct ctx *c, int argc, char **argv) if (errno || *e) die("Invalid MTU: %s", optarg); - if (mtu && (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU)) { - die("MTU %lu out of range (%u..%u)", mtu, - ETH_MIN_MTU, ETH_MAX_MTU); + if (mtu > ETH_MAX_MTU) { + die("MTU %lu too large (max %u)", + mtu, ETH_MAX_MTU); } c->mtu = mtu; @@ -1842,9 +1842,21 @@ void conf(struct ctx *c, int argc, char **argv) c->ifi4 = conf_ip4(ifi4, &c->ip4); if (!v4_only) c->ifi6 = conf_ip6(ifi6, &c->ip6); + + if (c->ifi4 && c->mtu < IPV4_MIN_MTU) { + warn("MTU %"PRIu16" is too small for IPv4 (minimum %u)", + c->mtu, IPV4_MIN_MTU); + } + if (c->ifi6 && c->mtu < IPV6_MIN_MTU) { + warn("MTU %"PRIu16" is too small for IPv6 (minimum %u)", + c->mtu, IPV6_MIN_MTU); + } + if ((*c->ip4.ifname_out && !c->ifi4) || (*c->ip6.ifname_out && !c->ifi6)) die("External interface not usable"); + + if (!c->ifi4 && !c->ifi6) { info("No external interface as template, switch to local mode"); @@ -129,4 +129,11 @@ static const struct in6_addr in6addr_ll_all_nodes = { /* IPv4 Limited Broadcast (RFC 919, Section 7), 255.255.255.255 */ static const struct in_addr in4addr_broadcast = { 0xffffffff }; +#ifndef IPV4_MIN_MTU +#define IPV4_MIN_MTU 68 +#endif +#ifndef IPV6_MIN_MTU +#define IPV6_MIN_MTU 1280 +#endif + #endif /* IP_H */ @@ -34,15 +34,9 @@ #ifndef ETH_MAX_MTU #define ETH_MAX_MTU USHRT_MAX #endif -#ifndef ETH_MIN_MTU -#define ETH_MIN_MTU 68 -#endif #ifndef IP_MAX_MTU #define IP_MAX_MTU USHRT_MAX #endif -#ifndef IPV6_MIN_MTU -#define IPV6_MIN_MTU 1280 -#endif #ifndef MIN #define MIN(x, y) (((x) < (y)) ? (x) : (y)) |