rtnl: add support for routes

3 files changed, 133 insertions, 15 deletions

diff --git a/src/libsystemd-rtnl/rtnl-message.c b/src/libsystemd-rtnl/rtnl-message.c
index eae73a65b4..9a40a75a9f 100644
--- a/src/libsystemd-rtnl/rtnl-message.c
+++ b/src/libsystemd-rtnl/rtnl-message.c
@@ -67,6 +67,42 @@ static int message_new(sd_rtnl_message **ret, size_t initial_size) {
         return 0;
 }
 
+int sd_rtnl_message_route_new(uint16_t nlmsg_type, unsigned char rtm_family,
+                              unsigned char rtm_dst_len, unsigned char rtm_src_len,
+                              unsigned char rtm_tos, unsigned char rtm_table,
+                              unsigned char rtm_scope, unsigned char rtm_protocol,
+                              unsigned char rtm_type, unsigned rtm_flags, sd_rtnl_message **ret) {
+        struct rtmsg *rtm;
+        int r;
+
+        assert_return(nlmsg_type == RTM_NEWROUTE || nlmsg_type == RTM_DELROUTE ||
+                      nlmsg_type == RTM_GETROUTE, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        r = message_new(ret, NLMSG_SPACE(sizeof(struct rtmsg)));
+        if (r < 0)
+                return r;
+
+        (*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
+        (*ret)->hdr->nlmsg_type = nlmsg_type;
+        if (nlmsg_type == RTM_NEWROUTE)
+                (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
+
+        rtm = NLMSG_DATA((*ret)->hdr);
+
+        rtm->rtm_family = rtm_family;
+        rtm->rtm_dst_len = rtm_dst_len;
+        rtm->rtm_src_len = rtm_src_len;
+        rtm->rtm_tos = rtm_tos;
+        rtm->rtm_table = rtm_table;
+        rtm->rtm_protocol = rtm_protocol;
+        rtm->rtm_scope = rtm_scope;
+        rtm->rtm_type = rtm_type;
+        rtm->rtm_flags = rtm_flags;
+
+        return 0;
+}
+
 int sd_rtnl_message_link_new(uint16_t nlmsg_type, int index, unsigned int type, unsigned int flags, sd_rtnl_message **ret) {
         struct ifinfomsg *ifi;
         int r;
@@ -189,6 +225,7 @@ static int add_rtattr(sd_rtnl_message *m, unsigned short type, const void *data,
 int sd_rtnl_message_append(sd_rtnl_message *m, unsigned short type, const void *data) {
         uint16_t rtm_type;
         struct ifaddrmsg *ifa;
+        struct rtmsg *rtm;
 
         assert_return(m, -EINVAL);
         assert_return(data, -EINVAL);
@@ -204,9 +241,9 @@ int sd_rtnl_message_append(sd_rtnl_message *m, unsigned short type, const void *
                                 case IFLA_QDISC:
                                         return add_rtattr(m, type, data, strlen(data) + 1);
                                 case IFLA_MTU:
-                                        return add_rtattr(m, type, data, sizeof(unsigned int));
+                                        return add_rtattr(m, type, data, sizeof(uint32_t));
                                 case IFLA_LINK:
-                                        return add_rtattr(m, type, data, sizeof(int));
+                                        return add_rtattr(m, type, data, sizeof(uint32_t));
                                 case IFLA_STATS:
                                         return add_rtattr(m, type, data, sizeof(struct rtnl_link_stats));
                                 case IFLA_ADDRESS:
@@ -237,6 +274,30 @@ int sd_rtnl_message_append(sd_rtnl_message *m, unsigned short type, const void *
                                 default:
                                         return -ENOTSUP;
                         }
+                case RTM_NEWROUTE:
+                case RTM_DELROUTE:
+                case RTM_GETROUTE:
+                        switch (type) {
+                                case RTA_DST:
+                                case RTA_SRC:
+                                case RTA_GATEWAY:
+                                        rtm = NLMSG_DATA(m->hdr);
+                                        switch (rtm->rtm_family) {
+                                                case AF_INET:
+                                                        return add_rtattr(m, type, data, sizeof(struct in_addr));
+                                                case AF_INET6:
+                                                        return add_rtattr(m, type, data, sizeof(struct in6_addr));
+                                                default:
+                                                        return -EINVAL;
+                                        }
+                                case RTA_TABLE:
+                                case RTA_PRIORITY:
+                                case RTA_IIF:
+                                case RTA_OIF:
+                                        return add_rtattr(m, type, data, sizeof(uint32_t));
+                                default:
+                                        return -ENOTSUP;
+                        }
                 default:
                         return -ENOTSUP;
         }
@@ -275,7 +336,7 @@ int sd_rtnl_message_read(sd_rtnl_message *m, unsigned short *type, void **data)
                                 m->next_rta = IFLA_RTA(ifi);
                                 m->remaining_size = IFLA_PAYLOAD(m->hdr);
                         }
-                        break;;
+                        break;
                 case RTM_NEWADDR:
                 case RTM_DELADDR:
                 case RTM_GETADDR:
@@ -283,9 +344,19 @@ int sd_rtnl_message_read(sd_rtnl_message *m, unsigned short *type, void **data)
                                 struct ifaddrmsg *ifa = NLMSG_DATA(m->hdr);
 
                                 m->next_rta = IFA_RTA(ifa);
-                                m->remaining_size = IFLA_PAYLOAD(m->hdr);
+                                m->remaining_size = IFA_PAYLOAD(m->hdr);
+                        }
+                        break;
+                case RTM_NEWROUTE:
+                case RTM_DELROUTE:
+                case RTM_GETROUTE:
+                        if (!m->next_rta) {
+                                struct rtmesg *rtm = NLMSG_DATA(m->hdr);
+
+                                m->next_rta = RTM_RTA(rtm);
+                                m->remaining_size = RTM_PAYLOAD(m->hdr);
                         }
-                        break;;
+                        break;
                 default:
                         return -ENOTSUP;
         }
@@ -415,22 +486,22 @@ int socket_read_message(sd_rtnl *nl, sd_rtnl_message **ret) {
                         case NLMSG_ERROR:
                                 if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
                                         k = -EIO;
-                                break;;
+                                break;
                         case RTM_NEWLINK:
                         case RTM_DELLINK:
                         case RTM_GETLINK:
                                 if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifinfomsg)))
                                         k = -EIO;
-                                break;;
+                                break;
                         case RTM_NEWADDR:
                         case RTM_DELADDR:
                         case RTM_GETADDR:
                                 if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifaddrmsg)))
                                         k = -EIO;
-                                break;;
+                                break;
                         case NLMSG_NOOP:
                                 k = 0;
-                                break;;
+                                break;
                         default:
                                 k = 0; /* ignoring message of unknown type */
                 }
diff --git a/src/libsystemd-rtnl/test-rtnl.c b/src/libsystemd-rtnl/test-rtnl.c
index 601548b786..2d2b2373b6 100644
--- a/src/libsystemd-rtnl/test-rtnl.c
+++ b/src/libsystemd-rtnl/test-rtnl.c
@@ -54,6 +54,43 @@ static void test_link_configure(sd_rtnl *rtnl, int ifindex) {
         assert(sd_rtnl_send_with_reply_and_block(rtnl, message, 0, NULL) == 0);
 }
 
+static void test_route(void) {
+        _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req;
+        uint32_t addr = htonl(INADDR_LOOPBACK);
+        uint32_t index = 2;
+        uint16_t type;
+        void *data;
+        int r;
+
+        r = sd_rtnl_message_route_new(RTM_NEWROUTE, AF_INET, 0, 0, 0,
+                                      RT_TABLE_MAIN, RT_SCOPE_UNIVERSE, RTPROT_BOOT,
+                                      RTN_UNICAST, 0, &req);
+        if (r < 0) {
+                log_error("Could not create RTM_NEWROUTE message: %s", strerror(-r));
+                return;
+        }
+
+        r = sd_rtnl_message_append(req, RTA_GATEWAY, &addr);
+        if (r < 0) {
+                log_error("Could not append RTA_GATEWAY attribute: %s", strerror(-r));
+                return;
+        }
+
+        r = sd_rtnl_message_append(req, RTA_OIF, &index);
+        if (r < 0) {
+                log_error("Could not append RTA_OIF attribute: %s", strerror(-r));
+                return;
+        }
+
+        assert(sd_rtnl_message_read(req, &type, &data) > 0);
+        assert(type == RTA_GATEWAY);
+        assert(*(uint32_t *) data == addr);
+
+        assert(sd_rtnl_message_read(req, &type, &data) > 0);
+        assert(type == RTA_OIF);
+        assert(*(uint32_t *) data == index);
+}
+
 static void test_multiple(void) {
         sd_rtnl *rtnl1, *rtnl2;
 
@@ -76,6 +113,8 @@ int main(void) {
 
         test_multiple();
 
+        test_route();
+
         assert(sd_rtnl_open(0, &rtnl) >= 0);
         assert(rtnl);
 
@@ -115,17 +154,17 @@ int main(void) {
         assert(sd_rtnl_message_read(m, &type, data) == 0);
 
         assert(sd_rtnl_send_with_reply_and_block(rtnl, m, -1, &r) >= 0);
-        while (sd_rtnl_message_read(r, &type, &data)) {
+        while (sd_rtnl_message_read(r, &type, &data) > 0) {
                 switch (type) {
 //                        case IFLA_MTU:
 //                                assert(*(unsigned int *) data == 65536);
-//                                break;;
+//                                break;
 //                        case IFLA_QDISC:
 //                                assert(streq((char *) data, "noqueue"));
-//                                break;;
+//                                break;
                         case IFLA_IFNAME:
                                 assert(streq((char *) data, "lo"));
-                                break;;
+                                break;
                 }
         }
 
diff --git a/src/systemd/sd-rtnl.h b/src/systemd/sd-rtnl.h
index ae0dcd803e..5c964a39b2 100644
--- a/src/systemd/sd-rtnl.h
+++ b/src/systemd/sd-rtnl.h
@@ -38,8 +38,16 @@ sd_rtnl *sd_rtnl_unref(sd_rtnl *nl);
 int sd_rtnl_send_with_reply_and_block(sd_rtnl *nl, sd_rtnl_message *message, uint64_t timeout, sd_rtnl_message **reply);
 
 /* messages */
-int sd_rtnl_message_link_new(uint16_t msg_type, int index, unsigned int type, unsigned int flags, sd_rtnl_message **ret);
-int sd_rtnl_message_addr_new(uint16_t msg_type, int index, unsigned char family, unsigned char prefixlen, unsigned char flags, unsigned char scope, sd_rtnl_message **ret);
+int sd_rtnl_message_link_new(uint16_t msg_type, int index, unsigned int type,
+                             unsigned int flags, sd_rtnl_message **ret);
+int sd_rtnl_message_addr_new(uint16_t msg_type, int index, unsigned char family,
+                             unsigned char prefixlen, unsigned char flags,
+                             unsigned char scope, sd_rtnl_message **ret);
+int sd_rtnl_message_route_new(uint16_t nlmsg_type, unsigned char rtm_family,
+                              unsigned char rtm_dst_len, unsigned char rtm_src_len,
+                              unsigned char rtm_tos, unsigned char rtm_table,
+                              unsigned char rtm_scope, unsigned char rtm_protocol,
+                              unsigned char rtm_type, unsigned flags, sd_rtnl_message **ret);
 sd_rtnl_message *sd_rtnl_message_ref(sd_rtnl_message *m);
 sd_rtnl_message *sd_rtnl_message_unref(sd_rtnl_message *m);