networkd: Introduce GENEVE netdev

This work enables cration of geneve tunnel

1 files changed, 394 insertions, 0 deletions

diff --git a/src/network/netdev/geneve.c b/src/network/netdev/geneve.c
new file mode 100644
index 0000000000..bb9807b556
--- /dev/null
+++ b/src/network/netdev/geneve.c
@@ -0,0 +1,394 @@
+/***
+    This file is part of systemd.
+
+    Copyright 2017 Susant Sahani
+
+    systemd is free software; you can redistribute it and/or modify it
+    under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 2.1 of the License, or
+    (at your option) any later version.
+
+    systemd is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <net/if.h>
+
+#include "alloc-util.h"
+#include "conf-parser.h"
+#include "extract-word.h"
+#include "geneve.h"
+#include "parse-util.h"
+#include "sd-netlink.h"
+#include "string-util.h"
+#include "strv.h"
+#include "missing.h"
+#include "networkd-manager.h"
+
+#define GENEVE_FLOW_LABEL_MAX_MASK 0xFFFFFU
+#define DEFAULT_GENEVE_DESTINATION_PORT 6081
+
+/* callback for geneve netdev's created without a backing Link */
+static int geneve_netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
+        _cleanup_netdev_unref_ NetDev *netdev = userdata;
+        int r;
+
+        assert(netdev->state != _NETDEV_STATE_INVALID);
+
+        r = sd_netlink_message_get_errno(m);
+        if (r == -EEXIST)
+                log_netdev_info(netdev, "Geneve netdev exists, using existing without changing its parameters");
+        else if (r < 0) {
+                log_netdev_warning_errno(netdev, r, "Geneve netdev could not be created: %m");
+                netdev_drop(netdev);
+
+                return 1;
+        }
+
+        log_netdev_debug(netdev, "Geneve created");
+
+        return 1;
+}
+
+static int netdev_geneve_create(NetDev *netdev) {
+        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
+        Geneve *v;
+        int r;
+
+        assert(netdev);
+
+        v = GENEVE(netdev);
+
+        r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not allocate RTM_NEWLINK message: %m");
+
+        r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not append IFLA_IFNAME, attribute: %m");
+
+        if (netdev->mac) {
+                r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);
+                if (r < 0)
+                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m");
+        }
+
+        if (netdev->mtu) {
+                r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
+                if (r < 0)
+                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_MTU attribute: %m");
+        }
+
+        r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
+
+        r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
+
+        if (v->id <= GENEVE_VID_MAX) {
+                r = sd_netlink_message_append_u32(m, IFLA_GENEVE_ID, v->id);
+                if (r < 0)
+                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_ID attribute: %m");
+        }
+
+        if (!in_addr_is_null(v->remote_family, &v->remote)) {
+
+                if (v->remote_family == AF_INET)
+                        r = sd_netlink_message_append_in_addr(m, IFLA_GENEVE_REMOTE, &v->remote.in);
+                else
+                        r = sd_netlink_message_append_in6_addr(m, IFLA_GENEVE_REMOTE6, &v->remote.in6);
+
+                if (r < 0)
+                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_GROUP attribute: %m");
+
+        }
+
+        if (v->ttl) {
+                r = sd_netlink_message_append_u8(m, IFLA_GENEVE_TTL, v->ttl);
+                if (r < 0)
+                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_TTL attribute: %m");
+        }
+
+        r = sd_netlink_message_append_u8(m, IFLA_GENEVE_TOS, v->tos);
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_TOS attribute: %m");
+
+        r = sd_netlink_message_append_u8(m, IFLA_GENEVE_UDP_CSUM, v->udpcsum);
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_UDP_CSUM attribute: %m");
+
+        r = sd_netlink_message_append_u8(m, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, v->udp6zerocsumtx);
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_UDP_ZERO_CSUM6_TX attribute: %m");
+
+        r = sd_netlink_message_append_u8(m, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, v->udp6zerocsumrx);
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_UDP_ZERO_CSUM6_RX attribute: %m");
+
+        if (v->dest_port != DEFAULT_GENEVE_DESTINATION_PORT) {
+                r = sd_netlink_message_append_u16(m, IFLA_GENEVE_PORT, htobe16(v->dest_port));
+                if (r < 0)
+                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_PORT attribute: %m");
+        }
+
+        if (v->flow_label > 0) {
+                r = sd_netlink_message_append_u32(m, IFLA_GENEVE_LABEL, htobe32(v->flow_label));
+                if (r < 0)
+                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_GENEVE_LABEL attribute: %m");
+        }
+
+        r = sd_netlink_message_close_container(m);
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
+
+        r = sd_netlink_message_close_container(m);
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
+
+        r = sd_netlink_call_async(netdev->manager->rtnl, m, geneve_netdev_create_handler, netdev, 0, NULL);
+        if (r < 0)
+                return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
+
+        netdev_ref(netdev);
+
+        netdev->state = NETDEV_STATE_CREATING;
+
+        log_netdev_debug(netdev, "Creating");
+
+
+        return r;
+}
+
+int config_parse_geneve_vni(const char *unit,
+                           const char *filename,
+                           unsigned line,
+                           const char *section,
+                           unsigned section_line,
+                           const char *lvalue,
+                           int ltype,
+                           const char *rvalue,
+                           void *data,
+                           void *userdata) {
+        Geneve *v = userdata;
+        uint32_t f;
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = safe_atou32(rvalue, &f);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse Geneve VNI '%s'.", rvalue);
+                return 0;
+        }
+
+        if (f > GENEVE_VID_MAX){
+                log_syntax(unit, LOG_ERR, filename, line, r, "Geneve VNI out is of range '%s'.", rvalue);
+                return 0;
+        }
+
+        v->id = f;
+
+        return 0;
+}
+
+int config_parse_geneve_tos(const char *unit,
+                                   const char *filename,
+                                   unsigned line,
+                                   const char *section,
+                                   unsigned section_line,
+                                   const char *lvalue,
+                                   int ltype,
+                                   const char *rvalue,
+                                   void *data,
+                                   void *userdata) {
+        Geneve *v = userdata;
+        uint8_t f;
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = safe_atou8(rvalue, &f);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse Geneve TOS '%s'.", rvalue);
+                return 0;
+        }
+
+        v->tos = f;
+
+        return 0;
+}
+
+int config_parse_geneve_ttl(const char *unit,
+                            const char *filename,
+                            unsigned line,
+                            const char *section,
+                            unsigned section_line,
+                            const char *lvalue,
+                            int ltype,
+                            const char *rvalue,
+                            void *data,
+                            void *userdata) {
+        Geneve *v = userdata;
+        uint8_t f;
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = safe_atou8(rvalue, &f);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse Geneve TTL '%s'.", rvalue);
+                return 0;
+        }
+
+        if (f == 0) {
+                log_syntax(unit, LOG_ERR, filename, line, r, "Invalid Geneve TTL '%s'.", rvalue);
+                return 0;
+        }
+
+        v->ttl = f;
+
+        return 0;
+}
+
+int config_parse_geneve_address(const char *unit,
+                                const char *filename,
+                                unsigned line,
+                                const char *section,
+                                unsigned section_line,
+                                const char *lvalue,
+                                int ltype,
+                                const char *rvalue,
+                                void *data,
+                                void *userdata) {
+        Geneve *v = userdata;
+        union in_addr_union *addr = data, buffer;
+        int r, f;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = in_addr_from_string_auto(rvalue, &f, &buffer);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, r, "geneve '%s' address is invalid, ignoring assignment: %s", lvalue, rvalue);
+                return 0;
+        }
+
+        r = in_addr_is_multicast(f, &buffer);
+        if (r > 0) {
+                log_syntax(unit, LOG_ERR, filename, line, 0, "geneve invalid multicast '%s' address, ignoring assignment: %s", lvalue, rvalue);
+                return 0;
+        }
+
+        v->remote_family = f;
+        *addr = buffer;
+
+        return 0;
+}
+
+int config_parse_geneve_destination_port(const char *unit,
+                                         const char *filename,
+                                         unsigned line,
+                                         const char *section,
+                                         unsigned section_line,
+                                         const char *lvalue,
+                                         int ltype,
+                                         const char *rvalue,
+                                         void *data,
+                                         void *userdata) {
+        Geneve *v = userdata;
+        uint16_t port;
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = parse_ip_port(rvalue, &port);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse Geneve destination port '%s'.", rvalue);
+                return 0;
+        }
+
+        v->dest_port = port;
+
+        return 0;
+}
+
+int config_parse_geneve_flow_label(const char *unit,
+                                   const char *filename,
+                                   unsigned line,
+                                   const char *section,
+                                   unsigned section_line,
+                                   const char *lvalue,
+                                   int ltype,
+                                   const char *rvalue,
+                                   void *data,
+                                   void *userdata) {
+        Geneve *v = userdata;
+        uint32_t f;
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = safe_atou32(rvalue, &f);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse Geneve flow label '%s'.", rvalue);
+                return 0;
+        }
+
+        if (f & ~GENEVE_FLOW_LABEL_MAX_MASK) {
+                log_syntax(unit, LOG_ERR, filename, line, r,
+                           "Geneve flow label '%s' not valid. Flow label range should be [0-1048575].", rvalue);
+                return 0;
+        }
+
+        v->flow_label = f;
+
+        return 0;
+}
+
+static void geneve_init(NetDev *netdev) {
+        Geneve *v;
+
+        assert(netdev);
+
+        v = GENEVE(netdev);
+
+        assert(v);
+
+        v->id = GENEVE_VID_MAX + 1;
+        v->dest_port = DEFAULT_GENEVE_DESTINATION_PORT;
+        v->udpcsum = false;
+        v->udp6zerocsumtx = false;
+        v->udp6zerocsumrx = false;
+}
+
+const NetDevVTable geneve_vtable = {
+        .object_size = sizeof(Geneve),
+        .init = geneve_init,
+        .sections = "Match\0NetDev\0GENEVE\0",
+        .create = netdev_geneve_create,
+        .create_type = NETDEV_CREATE_INDEPENDENT,
+};