interface-ip: route proto config support (FS#170)

Route proto support is usefull when using route distribution
via a routing daemon.
The route proto parameter can be specified via the route proto
uci config parameter, it can hold a numerical value or the string
values unspec, kernel, boot, static or a string present in
/etc/iproute2/rt_protos.

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

diff --git a/interface-ip.c b/interface-ip.c
index 24ea054..f8dab84 100644 (file)
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -40,6 +40,7 @@ enum {
        ROUTE_SOURCE,
        ROUTE_ONLINK,
        ROUTE_TYPE,
+       ROUTE_PROTO,
        __ROUTE_MAX
 };
 
@@ -54,7 +55,8 @@ static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
        [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
        [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
        [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
-       [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING }
+       [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
+       [ROUTE_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
 };
 
 const struct uci_blob_param_list route_attr_list = {
@@ -405,6 +407,14 @@ interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
                route->flags |= DEVROUTE_TYPE;
        }
 
+       if ((cur = tb[ROUTE_PROTO]) != NULL) {
+               if (!system_resolve_rt_proto(blobmsg_data(cur), &route->proto)) {
+                       DPRINTF("Failed to resolve proto type: %s\n", (char *) blobmsg_data(cur));
+                       goto error;
+               }
+               route->flags |= DEVROUTE_PROTO;
+       }
+
        interface_set_route_info(iface, route);
        vlist_add(&ip->route, &route->node, route);
        return;
@@ -478,10 +488,13 @@ interface_handle_subnet_route(struct interface *iface, struct device_addr *addr,
        memcpy(&r->addr, &addr->addr, sizeof(r->addr));
        clear_if_addr(&r->addr, r->mask);
 
-       r->flags |= DEVADDR_KERNEL;
+       if (!system_resolve_rt_proto("kernel", &r->proto))
+               return;
+
+       r->flags |= DEVROUTE_PROTO;
        system_del_route(dev, r);
 
-       r->flags &= ~DEVADDR_KERNEL;
+       r->flags &= ~DEVROUTE_PROTO;
        interface_set_route_info(iface, r);
 
        system_add_route(dev, r);
@@ -634,7 +647,7 @@ interface_update_proto_route(struct vlist_tree *tree,
        if (node_old && node_new)
                keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
                        (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
-                       !route_old->failed;
+                       (route_old->proto == route_new->proto) && !route_old->failed;
 
        if (node_old) {
                if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)

diff --git a/interface-ip.h b/interface-ip.h
index bbef62c..01727c9 100644 (file)
--- a/interface-ip.h
+++ b/interface-ip.h
@@ -31,8 +31,8 @@ enum device_addr_flags {
        /* route overrides the default interface mtu */
        DEVROUTE_MTU            = (1 << 4),
 
-       /* route automatically added by kernel */
-       DEVADDR_KERNEL          = (1 << 5),
+       /* route overrides the default proto type */
+       DEVROUTE_PROTO          = (1 << 5),
 
        /* address is off-link (no subnet-route) */
        DEVADDR_OFFLINK         = (1 << 6),
@@ -92,6 +92,7 @@ struct device_route {
        union if_addr nexthop;
        int mtu;
        unsigned int type;
+       unsigned int proto;
        time_t valid_until;
 
        /* must be last */

diff --git a/system-dummy.c b/system-dummy.c
index 9c734ea..2ea25ac 100644 (file)
--- a/system-dummy.c
+++ b/system-dummy.c
@@ -202,6 +202,12 @@ bool system_resolve_rt_type(const char *type, unsigned int *id)
        return true;
 }
 
+bool system_resolve_rt_proto(const char *type, unsigned int *id)
+{
+       *id = 0;
+       return true;
+}
+
 bool system_resolve_rt_table(const char *name, unsigned int *id)
 {
        *id = 0;

diff --git a/system-linux.c b/system-linux.c
index 2f15bf1..fcd1b2e 100644 (file)
--- a/system-linux.c
+++ b/system-linux.c
@@ -52,7 +52,6 @@
 #define IFA_FLAGS (IFA_MULTICAST + 1)
 #endif
 
-
 #include <string.h>
 #include <fcntl.h>
 #include <glob.h>
@@ -1782,7 +1781,7 @@ static int system_rt(struct device *dev, struct device_route *route, int cmd)
                .rtm_dst_len = route->mask,
                .rtm_src_len = route->sourcemask,
                .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
-               .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC,
+               .rtm_protocol = (route->flags & DEVROUTE_PROTO) ? route->proto : RTPROT_STATIC,
                .rtm_scope = RT_SCOPE_NOWHERE,
                .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
                .rtm_flags = (route->flags & DEVROUTE_ONLINK) ? RTNH_F_ONLINK : 0,
@@ -1900,6 +1899,45 @@ bool system_resolve_rt_type(const char *type, unsigned int *id)
        return system_rtn_aton(type, id);
 }
 
+bool system_resolve_rt_proto(const char *type, unsigned int *id)
+{
+       FILE *f;
+       char *e, buf[128];
+       unsigned int n, proto = 256;
+
+       if ((n = strtoul(type, &e, 0)) >= 0 && !*e && e != type)
+               proto = n;
+       else if (!strcmp(type, "unspec"))
+               proto = RTPROT_UNSPEC;
+       else if (!strcmp(type, "kernel"))
+               proto = RTPROT_KERNEL;
+       else if (!strcmp(type, "boot"))
+               proto = RTPROT_BOOT;
+       else if (!strcmp(type, "static"))
+               proto = RTPROT_STATIC;
+       else if ((f = fopen("/etc/iproute2/rt_protos", "r")) != NULL) {
+               while (fgets(buf, sizeof(buf) - 1, f) != NULL) {
+                       if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
+                               continue;
+
+                       n = strtoul(e, NULL, 10);
+                       e = strtok(NULL, " \t\n");
+
+                       if (e && !strcmp(e, type)) {
+                               proto = n;
+                               break;
+                       }
+               }
+               fclose(f);
+       }
+
+       if (proto > 255)
+               return false;
+
+       *id = proto;
+       return true;
+}
+
 bool system_resolve_rt_table(const char *name, unsigned int *id)
 {
        FILE *f;

diff --git a/system.h b/system.h
index d5cb4e3..e810ed9 100644 (file)
--- a/system.h
+++ b/system.h
@@ -146,6 +146,7 @@ int system_del_route(struct device *dev, struct device_route *route);
 int system_flush_routes(void);
 
 bool system_resolve_rt_type(const char *type, unsigned int *id);
+bool system_resolve_rt_proto(const char *type, unsigned int *id);
 bool system_resolve_rt_table(const char *name, unsigned int *id);
 bool system_is_default_rt_table(unsigned int id);
 bool system_resolve_rpfilter(const char *filter, unsigned int *id);

diff --git a/ubus.c b/ubus.c
index 29924c1..0123b17 100644 (file)
--- a/ubus.c
+++ b/ubus.c
@@ -486,6 +486,9 @@ interface_ip_dump_route_list(struct interface_ip_settings *ip, bool enabled)
                if (route->flags & DEVROUTE_TYPE)
                        blobmsg_add_u32(&b, "type", route->type);
 
+               if (route->flags & DEVROUTE_PROTO)
+                       blobmsg_add_u32(&b, "proto", route->proto);
+
                if (route->flags & DEVROUTE_MTU)
                        blobmsg_add_u32(&b, "mtu", route->mtu);