53cb501a13
This work add support to generic netlink to sd-netlink. See https://lwn.net/Articles/208755/ networkd: add support FooOverUDP support to IPIP tunnel netdev https://lwn.net/Articles/614348/ Example conf: /lib/systemd/network/1-fou-tunnel.netdev ``` [NetDev] Name=fou-tun Kind=fou [FooOverUDP] Port=5555 Protocol=4 ``` /lib/systemd/network/ipip-tunnel.netdev ``` [NetDev] Name=ipip-tun Kind=ipip [Tunnel] Independent=true Local=10.65.208.212 Remote=10.65.208.211 FooOverUDP=true FOUDestinationPort=5555 ``` $ ip -d link show ipip-tun ``` 5: ipip-tun@NONE: <POINTOPOINT,NOARP> mtu 1472 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ipip 10.65.208.212 peer 10.65.208.211 promiscuity 0 ipip remote 10.65.208.211 local 10.65.208.212 ttl inherit pmtudisc encap fou encap-sport auto encap-dport 5555 noencap-csum noencap-csum6 noencap-remcsum numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535 ```
98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
#include <linux/genetlink.h>
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#include "sd-netlink.h"
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#include "netlink-internal.h"
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#include "alloc-util.h"
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typedef struct {
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const char* name;
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uint8_t version;
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} genl_family;
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static const genl_family genl_families[] = {
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[SD_GENL_ID_CTRL] = { .name = "", .version = 1 },
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[SD_GENL_WIREGUARD] = { .name = "wireguard", .version = 1 },
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[SD_GENL_FOU] = { .name = "fou", .version = 1 },
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};
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int sd_genl_socket_open(sd_netlink **ret) {
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return netlink_open_family(ret, NETLINK_GENERIC);
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}
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static int lookup_id(sd_netlink *nl, sd_genl_family family, uint16_t *id);
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static int genl_message_new(sd_netlink *nl, sd_genl_family family, uint16_t nlmsg_type, uint8_t cmd, sd_netlink_message **ret) {
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int r;
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struct genlmsghdr *genl;
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const NLType *genl_cmd_type, *nl_type;
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const NLTypeSystem *type_system;
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size_t size;
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
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assert_return(nl->protocol == NETLINK_GENERIC, -EINVAL);
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r = type_system_get_type(&genl_family_type_system_root, &genl_cmd_type, family);
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if (r < 0)
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return r;
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r = message_new_empty(nl, &m);
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if (r < 0)
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return r;
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size = NLMSG_SPACE(sizeof(struct genlmsghdr));
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m->hdr = malloc0(size);
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if (!m->hdr)
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return -ENOMEM;
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m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
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type_get_type_system(genl_cmd_type, &type_system);
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r = type_system_get_type(type_system, &nl_type, cmd);
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if (r < 0)
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return r;
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m->hdr->nlmsg_len = size;
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m->hdr->nlmsg_type = nlmsg_type;
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type_get_type_system(nl_type, &m->containers[0].type_system);
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genl = NLMSG_DATA(m->hdr);
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genl->cmd = cmd;
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genl->version = genl_families[family].version;
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*ret = TAKE_PTR(m);
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return 0;
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}
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int sd_genl_message_new(sd_netlink *nl, sd_genl_family family, uint8_t cmd, sd_netlink_message **ret) {
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int r;
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uint16_t id = GENL_ID_CTRL;
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if (family != SD_GENL_ID_CTRL) {
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r = lookup_id(nl, family, &id);
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if (r < 0)
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return r;
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}
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return genl_message_new(nl, family, id, cmd, ret);
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}
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static int lookup_id(sd_netlink *nl, sd_genl_family family, uint16_t *id) {
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int r;
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
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r = sd_genl_message_new(nl, SD_GENL_ID_CTRL, CTRL_CMD_GETFAMILY, &req);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(req, CTRL_ATTR_FAMILY_NAME, genl_families[family].name);
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if (r < 0)
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return r;
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r = sd_netlink_call(nl, req, 0, &reply);
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if (r < 0)
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return r;
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return sd_netlink_message_read_u16(reply, CTRL_ATTR_FAMILY_ID, id);
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}
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