gtp: add GTP_CMD_CFG_* commands
This patch detaches the hashtable and the UDP setup from the
GTP_CMD_TUNNEL_* command. The gtp kernel modules needs to support
UDP socket reconfiguration.
After this patch, the steps to bring up a tunnel are:
1st) bring up the device gtp0 via rtnetlink using the "gtp" link type.
2nd) attach a configuration to the gtp0 device, it includes the
initialization of the hashes and the UDP socket, via genetlink
"gtp" family using the GTP_CMD_CFG_NEW command.
3rd) add/delete tunnels using genetlink "gtp" family and GTP_CMD_TUNNEL_*
commands.
Still unusable, but the netlink interface looks in better shape.
This commit is contained in:
Pablo Neira Ayuso
parent
fea67e726e
commit
c156be41fd
1
Makefile
1
Makefile
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@ -6,6 +6,7 @@ obj-m += gtp.o
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default:
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$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
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$(CC) -lmnl gtp-link-add.c -o gtp-link-add
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$(CC) -lmnl gtp-cfg-add.c genl.c -o gtp-cfg-add
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$(CC) -lmnl gtp-tunnel-add.c genl.c -o gtp-tunnel-add
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$(CC) -lmnl -g gtp-tunnel-get.c genl.o -o gtp-tunnel-get
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clean:
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@ -0,0 +1,63 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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#include <libmnl/libmnl.h>
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#include <linux/genetlink.h>
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#include "gtp.h"
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#include "genl.h"
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static uint32_t seq;
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static struct nlmsghdr *build_msg(int type, char *buf, uint32_t ifidx)
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{
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struct nlmsghdr *nlh;
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nlh = genl_nlmsg_build_hdr(buf, type, NLM_F_CREATE | NLM_F_ACK, ++seq,
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GTP_CMD_CFG_NEW);
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mnl_attr_put_u32(nlh, GTPA_CFG_LINK, ifidx);
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mnl_attr_put_u32(nlh, GTPA_CFG_LOCAL_ADDR_IPV4, 0);
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return nlh;
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}
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int main(int argc, char *argv[])
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{
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struct mnl_socket *nl;
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char buf[MNL_SOCKET_BUFFER_SIZE];
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struct nlmsghdr *nlh;
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struct genlmsghdr *genl;
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unsigned int portid;
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uint32_t gtp_ifidx;
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int32_t genl_id;
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if (argc != 2) {
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printf("%s <gtp device>\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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gtp_ifidx = if_nametoindex(argv[1]);
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nl = genl_socket_open();
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if (nl == NULL) {
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perror("mnl_socket_open");
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exit(EXIT_FAILURE);
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}
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genl_id = genl_lookup_family(nl, "gtp");
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if (genl_id < 0) {
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printf("not found gtp genl family\n");
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exit(EXIT_FAILURE);
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}
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nlh = build_msg(genl_id, buf, gtp_ifidx);
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if (genl_socket_talk(nl, nlh, seq, NULL, NULL) < 0)
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perror("genl_socket_talk");
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mnl_socket_close(nl);
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return 0;
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}
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320
gtp.c
320
gtp.c
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@ -108,6 +108,8 @@ struct pdp_ctx {
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struct gtp_instance {
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struct list_head list;
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bool socket_enabled;
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/* address for local UDP socket */
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struct sockaddr_in gtp0_addr;
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struct sockaddr_in gtp1u_addr;
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@ -117,6 +119,7 @@ struct gtp_instance {
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struct socket *sock1u;
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struct net_device *dev;
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struct net_device *real_dev;
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/* FIXME: hash / tree of pdp contexts */
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unsigned int hash_size;
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@ -281,7 +284,7 @@ static int gtp0_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
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skb_dst_drop(skb);
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nf_reset(skb);
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rc = dev_forward_skb(gti->dev, skb);
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rc = dev_forward_skb(gti->real_dev, skb);
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drop_put_rcu:
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rcu_read_unlock_bh();
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@ -365,7 +368,7 @@ static int gtp1u_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
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skb_dst_drop(skb);
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nf_reset(skb);
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rc = dev_forward_skb(gti->dev, skb);
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rc = dev_forward_skb(gti->real_dev, skb);
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drop_put_rcu:
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rcu_read_unlock_bh();
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@ -583,19 +586,6 @@ static const struct net_device_ops gtp_netdev_ops = {
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.ndo_start_xmit = gtp_dev_xmit,
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};
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enum {
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IFLA_GTP_UNSPEC,
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IFLA_GTP_LOCAL_ADDR_IPV4,
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IFLA_GTP_LOCAL_ADDR_IPV6,
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__IFLA_GTP_MAX,
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};
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#define IFLA_GTP_MAX (__IFLA_GTP_MAX - 1)
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static const struct nla_policy gtp_link_policy[IFLA_GTP_MAX + 1] = {
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[IFLA_GTP_LOCAL_ADDR_IPV4] = { .len = sizeof(struct in_addr) },
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[IFLA_GTP_LOCAL_ADDR_IPV6] = { .len = sizeof(struct in6_addr) },
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};
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static void gtp_link_setup(struct net_device *dev)
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{
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ether_setup(dev);
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@ -618,54 +608,45 @@ static int gtp_link_validate(struct nlattr *tb[], struct nlattr *data[])
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return -EADDRNOTAVAIL;
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}
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if (!data)
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return 0;
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if (data[IFLA_GTP_LOCAL_ADDR_IPV4] &&
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data[IFLA_GTP_LOCAL_ADDR_IPV6])
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return -EINVAL;
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if (data[IFLA_GTP_LOCAL_ADDR_IPV4])
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return 0;
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else if (data[IFLA_GTP_LOCAL_ADDR_IPV6])
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return 0;
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return -EINVAL;
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return 0;
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}
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static int gtp_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[])
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{
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struct gtp_instance *gti = netdev_priv(dev);
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struct net_device *real_dev;
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struct gtp_instance *gti;
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int err;
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pr_info("calling newlink gtp ...\n");
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pr_info("gtp_newlink\n");
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if (!tb[IFLA_LINK])
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return -EINVAL;
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gti->dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
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if (data && data[IFLA_GTP_LOCAL_ADDR_IPV4]) {
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gti->gtp0_addr.sin_addr.s_addr =
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gti->gtp1u_addr.sin_addr.s_addr =
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nla_get_u32(data[IFLA_GTP_LOCAL_ADDR_IPV4]);
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}
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real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
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if (!real_dev)
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return -ENODEV;
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if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
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dev_hold(real_dev);
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if (real_dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
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eth_hw_addr_random(dev);
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if (!tb[IFLA_MTU])
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dev->mtu = gti->dev->mtu;
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else if (dev->mtu > gti->dev->mtu)
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dev->mtu = real_dev->mtu;
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else if (dev->mtu > real_dev->mtu)
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return -EINVAL;
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err = register_netdevice(dev);
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if (err < 0)
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goto err1;
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gti = netdev_priv(dev);
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gti->dev = dev;
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gti->real_dev = real_dev;
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list_add_rcu(>i->list, >p_instance_list);
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pr_info("registered new netdev\n");
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pr_info("registered new %s interface\n", dev->name);
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return 0;
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err1:
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@ -677,51 +658,52 @@ static void gtp_dellink(struct net_device *dev, struct list_head *head)
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{
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struct gtp_instance *gti = netdev_priv(dev);
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unregister_netdevice_queue(dev, head);
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dev_put(gti->real_dev);
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list_del_rcu(>i->list);
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}
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static int gtp_changelink(struct net_device *dev, struct nlattr *tb[],
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struct nlattr *data[])
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{
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/* FIXME: local IP address for GTP UDP sockets */
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return -EOPNOTSUPP;
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}
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static size_t gtp_link_get_size(const struct net_device *dev)
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{
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return nla_total_size(sizeof(struct in_addr)) +
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nla_total_size(sizeof(struct in6_addr));
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}
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static int gtp_link_fill_info(struct sk_buff *skb, const struct net_device *dev)
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{
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struct gtp_instance *gti = netdev_priv(dev);
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if (nla_put_u32(skb, IFLA_GTP_LOCAL_ADDR_IPV4,
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gti->gtp0_addr.sin_addr.s_addr) < 0)
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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dev_hold(dev); /* XXX fix refcount problems */
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unregister_netdevice_queue(dev, head);
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}
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static struct rtnl_link_ops gtp_link_ops __read_mostly = {
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.kind = "gtp",
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.maxtype = IFLA_GTP_MAX,
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.policy = gtp_link_policy,
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.priv_size = sizeof(struct gtp_instance),
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.setup = gtp_link_setup,
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.validate = gtp_link_validate,
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.newlink = gtp_newlink,
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.dellink = gtp_dellink,
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.changelink = gtp_changelink,
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.get_size = gtp_link_get_size,
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.fill_info = gtp_link_fill_info,
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};
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static int gtp_hashtable_new(struct gtp_instance *gti, int hsize)
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{
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int i;
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gti->addr_hash = kmalloc(sizeof(struct hlist_head) * hsize, GFP_KERNEL);
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if (gti->addr_hash == NULL)
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return -ENOMEM;
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gti->tid_hash= kmalloc(sizeof(struct hlist_head) * hsize, GFP_KERNEL);
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if (gti->tid_hash == NULL)
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goto err1;
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gti->hash_size = hsize;
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for (i = 0; i < hsize; i++) {
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INIT_HLIST_HEAD(>i->addr_hash[i]);
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INIT_HLIST_HEAD(>i->tid_hash[i]);
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}
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return 0;
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err1:
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kfree(gti->addr_hash);
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return -ENOMEM;
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}
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static void gtp_hashtable_free(struct gtp_instance *gti)
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{
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/* XXX release tunnels in the hashes*/
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kfree(gti->addr_hash);
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kfree(gti->tid_hash);
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}
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static int gtp_create_bind_sock(struct gtp_instance *gti)
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{
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int rc;
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@ -777,6 +759,95 @@ static void gtp_destroy_bind_sock(struct gtp_instance *gti)
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sock_release(gti->sock0);
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}
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static struct net_device *gtp_find_dev(int ifindex)
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{
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struct gtp_instance *gti;
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list_for_each_entry_rcu(gti, >p_instance_list, list) {
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if (ifindex == gti->dev->ifindex)
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return gti->dev;
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}
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return NULL;
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}
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/* This configuration routine sets up the hashtable and it links the UDP
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* socket to the device.
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*/
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static int gtp_genl_cfg_new(struct sk_buff *skb, struct genl_info *info)
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{
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struct net_device *dev;
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struct gtp_instance *gti;
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int err;
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if (!info->attrs[GTPA_LINK])
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return -EINVAL;
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/* Check if there's an existing gtpX device to configure */
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dev = gtp_find_dev(nla_get_u32(info->attrs[GTPA_CFG_LINK]));
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if (dev == NULL)
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return -ENODEV;
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gti = netdev_priv(dev);
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/* Create the UDP socket if needed */
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if (info->nlhdr->nlmsg_flags & NLM_F_CREATE) {
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if (gti->socket_enabled)
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return -EBUSY;
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if (!info->attrs[GTPA_CFG_LOCAL_ADDR_IPV4])
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return -EINVAL;
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gti->gtp0_addr.sin_addr.s_addr =
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gti->gtp1u_addr.sin_addr.s_addr =
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nla_get_u32(info->attrs[GTPA_CFG_LOCAL_ADDR_IPV4]);
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/* XXX fix hardcoded hashtable size */
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err = gtp_hashtable_new(gti, 1024);
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if (err < 0)
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return err;
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err = gtp_create_bind_sock(gti);
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if (err < 0)
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goto err1;
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gti->socket_enabled = true;
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} else {
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/* XXX configuration updates not yet supported */
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return -EOPNOTSUPP;
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}
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return 0;
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err1:
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gtp_hashtable_free(gti);
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return err;
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}
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static int gtp_genl_cfg_get(struct sk_buff *skb, struct genl_info *info)
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{
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/* XXX */
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return 0;
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}
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static int gtp_genl_cfg_delete(struct sk_buff *skb, struct genl_info *info)
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{
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struct net_device *dev;
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struct gtp_instance *gti;
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if (!info->attrs[GTPA_LINK])
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return -EINVAL;
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/* Check if there's an existing gtpX device to configure */
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dev = gtp_find_dev(nla_get_u32(info->attrs[GTPA_CFG_LINK]));
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if (dev == NULL)
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return -ENODEV;
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gti = netdev_priv(dev);
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gtp_destroy_bind_sock(gti);
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gtp_hashtable_free(gti);
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return 0;
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}
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static int ipv4_pdp_add(struct gtp_instance *gti, uint32_t version,
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uint32_t sgsn_addr, uint32_t ms_addr, uint64_t tid)
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{
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@ -799,15 +870,11 @@ static int ipv4_pdp_add(struct gtp_instance *gti, uint32_t version,
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return 0;
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}
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static int gtp_tunnels;
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static int gtp_genl_tunnel_new(struct sk_buff *skb, struct genl_info *info)
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{
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struct net *net = sock_net(skb->sk);
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struct net_device *dev;
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struct gtp_instance *gti;
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u32 gtp_version, link, sgsn_addr, ms_addr, tid;
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int err;
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pr_info("adding new tunnel\n");
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@ -818,6 +885,16 @@ static int gtp_genl_tunnel_new(struct sk_buff *skb, struct genl_info *info)
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!info->attrs[GTPA_TID])
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return -EINVAL;
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/* Check if there's an existing gtpX device to configure */
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dev = gtp_find_dev(nla_get_u32(info->attrs[GTPA_LINK]));
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if (dev == NULL)
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return -ENODEV;
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gti = netdev_priv(dev);
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if (!gti->socket_enabled)
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return -ENETDOWN;
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gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]);
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link = nla_get_u32(info->attrs[GTPA_LINK]);
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sgsn_addr = nla_get_u32(info->attrs[GTPA_SGSN_ADDRESS]);
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@ -826,58 +903,12 @@ static int gtp_genl_tunnel_new(struct sk_buff *skb, struct genl_info *info)
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pr_info(" tunnel id = %u\n", tid);
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dev = dev_get_by_index(net, nla_get_u32(info->attrs[GTPA_LINK]));
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if (dev == NULL)
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return -ENOENT;
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if (strncmp(dev->name, "gtp", 3) != 0)
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return -EOPNOTSUPP;
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gti = netdev_priv(dev);
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if (gtp_tunnels == 0) {
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int i;
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gti->addr_hash= kmalloc(sizeof(struct hlist_head) * 1024,
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GFP_KERNEL);
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if (gti->addr_hash == NULL)
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return -ENOMEM;
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gti->tid_hash= kmalloc(sizeof(struct hlist_head) * 1024,
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GFP_KERNEL);
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if (gti->tid_hash == NULL)
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goto err1;
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gti->hash_size = 1024;
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for (i = 0; i < 1024; i++) {
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INIT_HLIST_HEAD(>i->addr_hash[i]);
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INIT_HLIST_HEAD(>i->tid_hash[i]);
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}
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err = gtp_create_bind_sock(gti);
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if (err < 0)
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goto err2;
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}
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|
||||
err = ipv4_pdp_add(gti, gtp_version, sgsn_addr, ms_addr, tid);
|
||||
if (err < 0)
|
||||
goto err3;
|
||||
|
||||
gtp_tunnels++;
|
||||
return 0;
|
||||
err3:
|
||||
gtp_destroy_bind_sock(gti);
|
||||
err2:
|
||||
kfree(gti->addr_hash);
|
||||
err1:
|
||||
kfree(gti->tid_hash);
|
||||
return err;
|
||||
return ipv4_pdp_add(gti, gtp_version, sgsn_addr, ms_addr, tid);
|
||||
}
|
||||
|
||||
static int gtp_genl_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
|
||||
{
|
||||
struct net *net = sock_net(skb->sk);
|
||||
struct gtp_instance *gti;
|
||||
struct net_device *dev;
|
||||
|
||||
pr_info("deleting tunnel\n");
|
||||
|
|
@ -889,23 +920,22 @@ static int gtp_genl_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
|
|||
!info->attrs[GTPA_TID])
|
||||
return -EINVAL;
|
||||
|
||||
dev = dev_get_by_index(net, nla_get_u32(info->attrs[GTPA_LINK]));
|
||||
/* Check if there's an existing gtpX device to configure */
|
||||
dev = gtp_find_dev(nla_get_u32(info->attrs[GTPA_LINK]));
|
||||
if (dev == NULL)
|
||||
return -ENOENT;
|
||||
return -ENODEV;
|
||||
|
||||
if (strncmp(dev->name, "gtp", 3) != 0)
|
||||
return -EOPNOTSUPP;
|
||||
gti = netdev_priv(dev);
|
||||
|
||||
if (--gtp_tunnels == 0)
|
||||
gtp_destroy_bind_sock(netdev_priv(dev));
|
||||
/* XXX not yet implemented */
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gtp_genl_tunnel_get(struct sk_buff *skb, struct genl_info *info)
|
||||
{
|
||||
struct net *net = sock_net(skb->sk);
|
||||
struct net_device *dev;
|
||||
struct gtp_instance *gti;
|
||||
|
||||
pr_info("get tunnel\n");
|
||||
|
||||
|
|
@ -913,12 +943,12 @@ static int gtp_genl_tunnel_get(struct sk_buff *skb, struct genl_info *info)
|
|||
!info->attrs[GTPA_LINK])
|
||||
return -EINVAL;
|
||||
|
||||
dev = dev_get_by_index(net, nla_get_u32(info->attrs[GTPA_LINK]));
|
||||
/* Check if there's an existing gtpX device to configure */
|
||||
dev = gtp_find_dev(nla_get_u32(info->attrs[GTPA_LINK]));
|
||||
if (dev == NULL)
|
||||
return -ENOENT;
|
||||
return -ENODEV;
|
||||
|
||||
if (strncmp(dev->name, "gtp", 3) != 0)
|
||||
return -EOPNOTSUPP;
|
||||
gti = netdev_priv(dev);
|
||||
|
||||
if (info->attrs[GTPA_TID])
|
||||
pr_info("by tid\n");
|
||||
|
|
@ -1015,6 +1045,24 @@ static struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = {
|
|||
};
|
||||
|
||||
static const struct genl_ops gtp_genl_ops[] = {
|
||||
{
|
||||
.cmd = GTP_CMD_CFG_NEW,
|
||||
.doit = gtp_genl_cfg_new,
|
||||
.policy = gtp_genl_policy,
|
||||
.flags = GENL_ADMIN_PERM,
|
||||
},
|
||||
{
|
||||
.cmd = GTP_CMD_CFG_DELETE,
|
||||
.doit = gtp_genl_cfg_delete,
|
||||
.policy = gtp_genl_policy,
|
||||
.flags = GENL_ADMIN_PERM,
|
||||
},
|
||||
{
|
||||
.cmd = GTP_CMD_CFG_GET,
|
||||
.doit = gtp_genl_cfg_get,
|
||||
.policy = gtp_genl_policy,
|
||||
.flags = GENL_ADMIN_PERM,
|
||||
},
|
||||
{
|
||||
.cmd = GTP_CMD_TUNNEL_NEW,
|
||||
.doit = gtp_genl_tunnel_new,
|
||||
|
|
|
|||
14
gtp.h
14
gtp.h
|
|
@ -1,6 +1,9 @@
|
|||
#ifndef _UAPI_LINUX_GTP_H_
|
||||
|
||||
enum gtp_genl_cmds {
|
||||
GTP_CMD_CFG_NEW,
|
||||
GTP_CMD_CFG_DELETE,
|
||||
GTP_CMD_CFG_GET,
|
||||
GTP_CMD_TUNNEL_NEW,
|
||||
GTP_CMD_TUNNEL_DELETE,
|
||||
GTP_CMD_TUNNEL_GET,
|
||||
|
|
@ -13,11 +16,20 @@ enum gtp_version {
|
|||
GTP_V1,
|
||||
};
|
||||
|
||||
enum gtp_cfg_attrs {
|
||||
GTPA_CFG_UNSPEC = 0,
|
||||
GTPA_CFG_LINK,
|
||||
GTPA_CFG_LOCAL_ADDR_IPV4,
|
||||
GTPA_CFG_HSIZE,
|
||||
__GTPA_CFG_MAX,
|
||||
};
|
||||
#define GTPA_CFG_MAX (__GTPA_CFG_MAX + 1)
|
||||
|
||||
enum gtp_attrs {
|
||||
GTPA_UNSPEC = 0,
|
||||
GTPA_LINK,
|
||||
GTPA_VERSION,
|
||||
GTPA_TID, /* 64 bits for GTPv1 */
|
||||
GTPA_LINK,
|
||||
GTPA_SGSN_ADDRESS,
|
||||
GTPA_MS_ADDRESS,
|
||||
__GTPA_MAX,
|
||||
|
|
|
|||
Loading…
Reference in New Issue