aboutgitcodebugslistschat
path: root/conf.c
diff options
context:
space:
mode:
Diffstat (limited to 'conf.c')
-rw-r--r--conf.c97
1 files changed, 76 insertions, 21 deletions
diff --git a/conf.c b/conf.c
index d342c8a..c6bffc4 100644
--- a/conf.c
+++ b/conf.c
@@ -48,6 +48,20 @@
#define NETNS_RUN_DIR "/run/netns"
+#define IP4_LL_GUEST_ADDR (struct in_addr){ htonl_constant(0xa9fe0201) }
+ /* 169.254.2.1, libslirp default: 10.0.2.1 */
+
+#define IP4_LL_GUEST_GW (struct in_addr){ htonl_constant(0xa9fe0202) }
+ /* 169.254.2.2, libslirp default: 10.0.2.2 */
+
+#define IP4_LL_PREFIX_LEN 16
+
+#define IP6_LL_GUEST_GW (struct in6_addr) \
+ {{{ 0xfe, 0x80, 0, 0, 0, 0, 0, 0, \
+ 0, 0, 0, 0, 0, 0, 0, 0x01 }}}
+
+const char *pasta_default_ifn = "tap0";
+
/**
* next_chunk - Return the next piece of a string delimited by a character
* @s: String to search
@@ -631,7 +645,7 @@ static unsigned int conf_ip4(unsigned int ifi, struct ip4_ctx *ip4)
ifi = nl_get_ext_if(nl_sock, AF_INET);
if (!ifi) {
- info("Couldn't pick external interface: disabling IPv4");
+ debug("Failed to detect external interface for IPv4");
return 0;
}
@@ -639,8 +653,8 @@ static unsigned int conf_ip4(unsigned int ifi, struct ip4_ctx *ip4)
int rc = nl_route_get_def(nl_sock, ifi, AF_INET,
&ip4->guest_gw);
if (rc < 0) {
- err("Couldn't discover IPv4 gateway address: %s",
- strerror(-rc));
+ debug("Couldn't discover IPv4 gateway address: %s",
+ strerror(-rc));
return 0;
}
}
@@ -649,8 +663,8 @@ static unsigned int conf_ip4(unsigned int ifi, struct ip4_ctx *ip4)
int rc = nl_addr_get(nl_sock, ifi, AF_INET,
&ip4->addr, &ip4->prefix_len, NULL);
if (rc < 0) {
- err("Couldn't discover IPv4 address: %s",
- strerror(-rc));
+ debug("Couldn't discover IPv4 address: %s",
+ strerror(-rc));
return 0;
}
}
@@ -678,6 +692,19 @@ static unsigned int conf_ip4(unsigned int ifi, struct ip4_ctx *ip4)
}
/**
+ * conf_ip4_local() - Configure IPv4 addresses and attributes for local mode
+ * @ip4: IPv4 context (will be written)
+ */
+static void conf_ip4_local(struct ip4_ctx *ip4)
+{
+ ip4->addr_seen = ip4->addr = IP4_LL_GUEST_ADDR;
+ ip4->our_tap_addr = ip4->guest_gw = IP4_LL_GUEST_GW;
+ ip4->prefix_len = IP4_LL_PREFIX_LEN;
+
+ ip4->no_copy_addrs = ip4->no_copy_routes = true;
+}
+
+/**
* conf_ip6() - Verify or detect IPv6 support, get relevant addresses
* @ifi: Host interface to attempt (0 to determine one)
* @ip6: IPv6 context (will be written)
@@ -693,15 +720,15 @@ static unsigned int conf_ip6(unsigned int ifi, struct ip6_ctx *ip6)
ifi = nl_get_ext_if(nl_sock, AF_INET6);
if (!ifi) {
- info("Couldn't pick external interface: disabling IPv6");
+ debug("Failed to detect external interface for IPv6");
return 0;
}
if (IN6_IS_ADDR_UNSPECIFIED(&ip6->guest_gw)) {
rc = nl_route_get_def(nl_sock, ifi, AF_INET6, &ip6->guest_gw);
if (rc < 0) {
- err("Couldn't discover IPv6 gateway address: %s",
- strerror(-rc));
+ debug("Couldn't discover IPv6 gateway address: %s",
+ strerror(-rc));
return 0;
}
}
@@ -710,7 +737,7 @@ static unsigned int conf_ip6(unsigned int ifi, struct ip6_ctx *ip6)
IN6_IS_ADDR_UNSPECIFIED(&ip6->addr) ? &ip6->addr : NULL,
&prefix_len, &ip6->our_tap_ll);
if (rc < 0) {
- err("Couldn't discover IPv6 address: %s", strerror(-rc));
+ debug("Couldn't discover IPv6 address: %s", strerror(-rc));
return 0;
}
@@ -727,6 +754,17 @@ static unsigned int conf_ip6(unsigned int ifi, struct ip6_ctx *ip6)
}
/**
+ * conf_ip6_local() - Configure IPv6 addresses and attributes for local mode
+ * @ip6: IPv6 context (will be written)
+ */
+static void conf_ip6_local(struct ip6_ctx *ip6)
+{
+ ip6->our_tap_ll = ip6->guest_gw = IP6_LL_GUEST_GW;
+
+ ip6->no_copy_addrs = ip6->no_copy_routes = true;
+}
+
+/**
* usage() - Print usage, exit with given status code
* @name: Executable name
* @f: Stream to print usage info to
@@ -948,12 +986,14 @@ static void conf_print(const struct ctx *c)
char bufmac[ETH_ADDRSTRLEN], ifn[IFNAMSIZ];
int i;
- info("Template interface: %s%s%s%s%s",
- c->ifi4 ? if_indextoname(c->ifi4, ifn) : "",
- c->ifi4 ? " (IPv4)" : "",
- (c->ifi4 && c->ifi6) ? ", " : "",
- c->ifi6 ? if_indextoname(c->ifi6, ifn) : "",
- c->ifi6 ? " (IPv6)" : "");
+ if (c->ifi4 > 0 || c->ifi6 > 0) {
+ info("Template interface: %s%s%s%s%s",
+ c->ifi4 > 0 ? if_indextoname(c->ifi4, ifn) : "",
+ c->ifi4 > 0 ? " (IPv4)" : "",
+ (c->ifi4 && c->ifi6) ? ", " : "",
+ c->ifi6 > 0 ? if_indextoname(c->ifi6, ifn) : "",
+ c->ifi6 > 0 ? " (IPv6)" : "");
+ }
if (*c->ip4.ifname_out || *c->ip6.ifname_out) {
info("Outbound interface: %s%s%s%s%s",
@@ -1024,9 +1064,9 @@ static void conf_print(const struct ctx *c)
if (!c->no_ndp && !c->no_dhcpv6)
info("NDP/DHCPv6:");
- else if (!c->no_ndp)
- info("DHCPv6:");
else if (!c->no_dhcpv6)
+ info("DHCPv6:");
+ else if (!c->no_ndp)
info("NDP:");
else
goto dns6;
@@ -1733,10 +1773,23 @@ 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->ifi6) ||
- (*c->ip4.ifname_out && !c->ifi4) ||
+ 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");
+
+ conf_ip4_local(&c->ip4);
+ c->ifi4 = -1;
+
+ conf_ip6_local(&c->ip6);
+ c->ifi6 = -1;
+
+ if (!*c->pasta_ifn) {
+ strncpy(c->pasta_ifn, pasta_default_ifn,
+ sizeof(c->pasta_ifn) - 1);
+ }
+ }
if (c->ifi4 && !no_map_gw &&
IN4_IS_ADDR_UNSPECIFIED(&c->ip4.map_host_loopback))
@@ -1840,6 +1893,8 @@ void conf(struct ctx *c, int argc, char **argv)
if (!c->ifi6) {
c->no_ndp = 1;
c->no_dhcpv6 = 1;
+ } else if (IN6_IS_ADDR_UNSPECIFIED(&c->ip6.addr)) {
+ c->no_dhcpv6 = 1;
}
if (!c->mtu)
@@ -1848,9 +1903,9 @@ void conf(struct ctx *c, int argc, char **argv)
get_dns(c);
if (!*c->pasta_ifn) {
- if (c->ifi4)
+ if (c->ifi4 > 0)
if_indextoname(c->ifi4, c->pasta_ifn);
- else
+ else if (c->ifi6 > 0)
if_indextoname(c->ifi6, c->pasta_ifn);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-23 08:22:57 +0000