| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* GTP according to GSM TS 09.60 / 3GPP TS 29.060 |
| * |
| * (C) 2012-2014 by sysmocom - s.f.m.c. GmbH |
| * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org> |
| * |
| * Author: Harald Welte <hwelte@sysmocom.de> |
| * Pablo Neira Ayuso <pablo@netfilter.org> |
| * Andreas Schultz <aschultz@travelping.com> |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/skbuff.h> |
| #include <linux/udp.h> |
| #include <linux/rculist.h> |
| #include <linux/jhash.h> |
| #include <linux/if_tunnel.h> |
| #include <linux/net.h> |
| #include <linux/file.h> |
| #include <linux/gtp.h> |
| |
| #include <net/net_namespace.h> |
| #include <net/protocol.h> |
| #include <net/ip.h> |
| #include <net/udp.h> |
| #include <net/udp_tunnel.h> |
| #include <net/icmp.h> |
| #include <net/xfrm.h> |
| #include <net/genetlink.h> |
| #include <net/netns/generic.h> |
| #include <net/gtp.h> |
| |
| /* An active session for the subscriber. */ |
| struct pdp_ctx { |
| struct hlist_node hlist_tid; |
| struct hlist_node hlist_addr; |
| |
| union { |
| struct { |
| u64 tid; |
| u16 flow; |
| } v0; |
| struct { |
| u32 i_tei; |
| u32 o_tei; |
| } v1; |
| } u; |
| u8 gtp_version; |
| u16 af; |
| |
| struct in_addr ms_addr_ip4; |
| struct in_addr peer_addr_ip4; |
| |
| struct sock *sk; |
| struct net_device *dev; |
| |
| atomic_t tx_seq; |
| struct rcu_head rcu_head; |
| }; |
| |
| /* One instance of the GTP device. */ |
| struct gtp_dev { |
| struct list_head list; |
| |
| struct sock *sk0; |
| struct sock *sk1u; |
| |
| struct net_device *dev; |
| |
| unsigned int role; |
| unsigned int hash_size; |
| struct hlist_head *tid_hash; |
| struct hlist_head *addr_hash; |
| }; |
| |
| static unsigned int gtp_net_id __read_mostly; |
| |
| struct gtp_net { |
| struct list_head gtp_dev_list; |
| }; |
| |
| static u32 gtp_h_initval; |
| |
| static void pdp_context_delete(struct pdp_ctx *pctx); |
| |
| static inline u32 gtp0_hashfn(u64 tid) |
| { |
| u32 *tid32 = (u32 *) &tid; |
| return jhash_2words(tid32[0], tid32[1], gtp_h_initval); |
| } |
| |
| static inline u32 gtp1u_hashfn(u32 tid) |
| { |
| return jhash_1word(tid, gtp_h_initval); |
| } |
| |
| static inline u32 ipv4_hashfn(__be32 ip) |
| { |
| return jhash_1word((__force u32)ip, gtp_h_initval); |
| } |
| |
| /* Resolve a PDP context structure based on the 64bit TID. */ |
| static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid) |
| { |
| struct hlist_head *head; |
| struct pdp_ctx *pdp; |
| |
| head = >p->tid_hash[gtp0_hashfn(tid) % gtp->hash_size]; |
| |
| hlist_for_each_entry_rcu(pdp, head, hlist_tid) { |
| if (pdp->gtp_version == GTP_V0 && |
| pdp->u.v0.tid == tid) |
| return pdp; |
| } |
| return NULL; |
| } |
| |
| /* Resolve a PDP context structure based on the 32bit TEI. */ |
| static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid) |
| { |
| struct hlist_head *head; |
| struct pdp_ctx *pdp; |
| |
| head = >p->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size]; |
| |
| hlist_for_each_entry_rcu(pdp, head, hlist_tid) { |
| if (pdp->gtp_version == GTP_V1 && |
| pdp->u.v1.i_tei == tid) |
| return pdp; |
| } |
| return NULL; |
| } |
| |
| /* Resolve a PDP context based on IPv4 address of MS. */ |
| static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr) |
| { |
| struct hlist_head *head; |
| struct pdp_ctx *pdp; |
| |
| head = >p->addr_hash[ipv4_hashfn(ms_addr) % gtp->hash_size]; |
| |
| hlist_for_each_entry_rcu(pdp, head, hlist_addr) { |
| if (pdp->af == AF_INET && |
| pdp->ms_addr_ip4.s_addr == ms_addr) |
| return pdp; |
| } |
| |
| return NULL; |
| } |
| |
| static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx, |
| unsigned int hdrlen, unsigned int role) |
| { |
| struct iphdr *iph; |
| |
| if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr))) |
| return false; |
| |
| iph = (struct iphdr *)(skb->data + hdrlen); |
| |
| if (role == GTP_ROLE_SGSN) |
| return iph->daddr == pctx->ms_addr_ip4.s_addr; |
| else |
| return iph->saddr == pctx->ms_addr_ip4.s_addr; |
| } |
| |
| /* Check if the inner IP address in this packet is assigned to any |
| * existing mobile subscriber. |
| */ |
| static bool gtp_check_ms(struct sk_buff *skb, struct pdp_ctx *pctx, |
| unsigned int hdrlen, unsigned int role) |
| { |
| switch (ntohs(skb->protocol)) { |
| case ETH_P_IP: |
| return gtp_check_ms_ipv4(skb, pctx, hdrlen, role); |
| } |
| return false; |
| } |
| |
| static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb, |
| unsigned int hdrlen, unsigned int role) |
| { |
| if (!gtp_check_ms(skb, pctx, hdrlen, role)) { |
| netdev_dbg(pctx->dev, "No PDP ctx for this MS\n"); |
| return 1; |
| } |
| |
| /* Get rid of the GTP + UDP headers. */ |
| if (iptunnel_pull_header(skb, hdrlen, skb->protocol, |
| !net_eq(sock_net(pctx->sk), dev_net(pctx->dev)))) { |
| pctx->dev->stats.rx_length_errors++; |
| goto err; |
| } |
| |
| netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n"); |
| |
| /* Now that the UDP and the GTP header have been removed, set up the |
| * new network header. This is required by the upper layer to |
| * calculate the transport header. |
| */ |
| skb_reset_network_header(skb); |
| skb_reset_mac_header(skb); |
| |
| skb->dev = pctx->dev; |
| |
| dev_sw_netstats_rx_add(pctx->dev, skb->len); |
| |
| netif_rx(skb); |
| return 0; |
| |
| err: |
| pctx->dev->stats.rx_dropped++; |
| return -1; |
| } |
| |
| /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */ |
| static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) |
| { |
| unsigned int hdrlen = sizeof(struct udphdr) + |
| sizeof(struct gtp0_header); |
| struct gtp0_header *gtp0; |
| struct pdp_ctx *pctx; |
| |
| if (!pskb_may_pull(skb, hdrlen)) |
| return -1; |
| |
| gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr)); |
| |
| if ((gtp0->flags >> 5) != GTP_V0) |
| return 1; |
| |
| if (gtp0->type != GTP_TPDU) |
| return 1; |
| |
| pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid)); |
| if (!pctx) { |
| netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); |
| return 1; |
| } |
| |
| return gtp_rx(pctx, skb, hdrlen, gtp->role); |
| } |
| |
| static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) |
| { |
| unsigned int hdrlen = sizeof(struct udphdr) + |
| sizeof(struct gtp1_header); |
| struct gtp1_header *gtp1; |
| struct pdp_ctx *pctx; |
| |
| if (!pskb_may_pull(skb, hdrlen)) |
| return -1; |
| |
| gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); |
| |
| if ((gtp1->flags >> 5) != GTP_V1) |
| return 1; |
| |
| if (gtp1->type != GTP_TPDU) |
| return 1; |
| |
| /* From 29.060: "This field shall be present if and only if any one or |
| * more of the S, PN and E flags are set.". |
| * |
| * If any of the bit is set, then the remaining ones also have to be |
| * set. |
| */ |
| if (gtp1->flags & GTP1_F_MASK) |
| hdrlen += 4; |
| |
| /* Make sure the header is larger enough, including extensions. */ |
| if (!pskb_may_pull(skb, hdrlen)) |
| return -1; |
| |
| gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); |
| |
| pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid)); |
| if (!pctx) { |
| netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); |
| return 1; |
| } |
| |
| return gtp_rx(pctx, skb, hdrlen, gtp->role); |
| } |
| |
| static void __gtp_encap_destroy(struct sock *sk) |
| { |
| struct gtp_dev *gtp; |
| |
| lock_sock(sk); |
| gtp = sk->sk_user_data; |
| if (gtp) { |
| if (gtp->sk0 == sk) |
| gtp->sk0 = NULL; |
| else |
| gtp->sk1u = NULL; |
| udp_sk(sk)->encap_type = 0; |
| rcu_assign_sk_user_data(sk, NULL); |
| release_sock(sk); |
| sock_put(sk); |
| return; |
| } |
| release_sock(sk); |
| } |
| |
| static void gtp_encap_destroy(struct sock *sk) |
| { |
| rtnl_lock(); |
| __gtp_encap_destroy(sk); |
| rtnl_unlock(); |
| } |
| |
| static void gtp_encap_disable_sock(struct sock *sk) |
| { |
| if (!sk) |
| return; |
| |
| __gtp_encap_destroy(sk); |
| } |
| |
| static void gtp_encap_disable(struct gtp_dev *gtp) |
| { |
| gtp_encap_disable_sock(gtp->sk0); |
| gtp_encap_disable_sock(gtp->sk1u); |
| } |
| |
| /* UDP encapsulation receive handler. See net/ipv4/udp.c. |
| * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket. |
| */ |
| static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) |
| { |
| struct gtp_dev *gtp; |
| int ret = 0; |
| |
| gtp = rcu_dereference_sk_user_data(sk); |
| if (!gtp) |
| return 1; |
| |
| netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk); |
| |
| switch (udp_sk(sk)->encap_type) { |
| case UDP_ENCAP_GTP0: |
| netdev_dbg(gtp->dev, "received GTP0 packet\n"); |
| ret = gtp0_udp_encap_recv(gtp, skb); |
| break; |
| case UDP_ENCAP_GTP1U: |
| netdev_dbg(gtp->dev, "received GTP1U packet\n"); |
| ret = gtp1u_udp_encap_recv(gtp, skb); |
| break; |
| default: |
| ret = -1; /* Shouldn't happen. */ |
| } |
| |
| switch (ret) { |
| case 1: |
| netdev_dbg(gtp->dev, "pass up to the process\n"); |
| break; |
| case 0: |
| break; |
| case -1: |
| netdev_dbg(gtp->dev, "GTP packet has been dropped\n"); |
| kfree_skb(skb); |
| ret = 0; |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static int gtp_dev_init(struct net_device *dev) |
| { |
| struct gtp_dev *gtp = netdev_priv(dev); |
| |
| gtp->dev = dev; |
| |
| dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| if (!dev->tstats) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void gtp_dev_uninit(struct net_device *dev) |
| { |
| struct gtp_dev *gtp = netdev_priv(dev); |
| |
| gtp_encap_disable(gtp); |
| free_percpu(dev->tstats); |
| } |
| |
| static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4, |
| const struct sock *sk, |
| __be32 daddr) |
| { |
| memset(fl4, 0, sizeof(*fl4)); |
| fl4->flowi4_oif = sk->sk_bound_dev_if; |
| fl4->daddr = daddr; |
| fl4->saddr = inet_sk(sk)->inet_saddr; |
| fl4->flowi4_tos = RT_CONN_FLAGS(sk); |
| fl4->flowi4_proto = sk->sk_protocol; |
| |
| return ip_route_output_key(sock_net(sk), fl4); |
| } |
| |
| static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) |
| { |
| int payload_len = skb->len; |
| struct gtp0_header *gtp0; |
| |
| gtp0 = skb_push(skb, sizeof(*gtp0)); |
| |
| gtp0->flags = 0x1e; /* v0, GTP-non-prime. */ |
| gtp0->type = GTP_TPDU; |
| gtp0->length = htons(payload_len); |
| gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff); |
| gtp0->flow = htons(pctx->u.v0.flow); |
| gtp0->number = 0xff; |
| gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xff; |
| gtp0->tid = cpu_to_be64(pctx->u.v0.tid); |
| } |
| |
| static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) |
| { |
| int payload_len = skb->len; |
| struct gtp1_header *gtp1; |
| |
| gtp1 = skb_push(skb, sizeof(*gtp1)); |
| |
| /* Bits 8 7 6 5 4 3 2 1 |
| * +--+--+--+--+--+--+--+--+ |
| * |version |PT| 0| E| S|PN| |
| * +--+--+--+--+--+--+--+--+ |
| * 0 0 1 1 1 0 0 0 |
| */ |
| gtp1->flags = 0x30; /* v1, GTP-non-prime. */ |
| gtp1->type = GTP_TPDU; |
| gtp1->length = htons(payload_len); |
| gtp1->tid = htonl(pctx->u.v1.o_tei); |
| |
| /* TODO: Support for extension header, sequence number and N-PDU. |
| * Update the length field if any of them is available. |
| */ |
| } |
| |
| struct gtp_pktinfo { |
| struct sock *sk; |
| struct iphdr *iph; |
| struct flowi4 fl4; |
| struct rtable *rt; |
| struct pdp_ctx *pctx; |
| struct net_device *dev; |
| __be16 gtph_port; |
| }; |
| |
| static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo) |
| { |
| switch (pktinfo->pctx->gtp_version) { |
| case GTP_V0: |
| pktinfo->gtph_port = htons(GTP0_PORT); |
| gtp0_push_header(skb, pktinfo->pctx); |
| break; |
| case GTP_V1: |
| pktinfo->gtph_port = htons(GTP1U_PORT); |
| gtp1_push_header(skb, pktinfo->pctx); |
| break; |
| } |
| } |
| |
| static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo, |
| struct sock *sk, struct iphdr *iph, |
| struct pdp_ctx *pctx, struct rtable *rt, |
| struct flowi4 *fl4, |
| struct net_device *dev) |
| { |
| pktinfo->sk = sk; |
| pktinfo->iph = iph; |
| pktinfo->pctx = pctx; |
| pktinfo->rt = rt; |
| pktinfo->fl4 = *fl4; |
| pktinfo->dev = dev; |
| } |
| |
| static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, |
| struct gtp_pktinfo *pktinfo) |
| { |
| struct gtp_dev *gtp = netdev_priv(dev); |
| struct pdp_ctx *pctx; |
| struct rtable *rt; |
| struct flowi4 fl4; |
| struct iphdr *iph; |
| __be16 df; |
| int mtu; |
| |
| /* Read the IP destination address and resolve the PDP context. |
| * Prepend PDP header with TEI/TID from PDP ctx. |
| */ |
| iph = ip_hdr(skb); |
| if (gtp->role == GTP_ROLE_SGSN) |
| pctx = ipv4_pdp_find(gtp, iph->saddr); |
| else |
| pctx = ipv4_pdp_find(gtp, iph->daddr); |
| |
| if (!pctx) { |
| netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n", |
| &iph->daddr); |
| return -ENOENT; |
| } |
| netdev_dbg(dev, "found PDP context %p\n", pctx); |
| |
| rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->peer_addr_ip4.s_addr); |
| if (IS_ERR(rt)) { |
| netdev_dbg(dev, "no route to SSGN %pI4\n", |
| &pctx->peer_addr_ip4.s_addr); |
| dev->stats.tx_carrier_errors++; |
| goto err; |
| } |
| |
| if (rt->dst.dev == dev) { |
| netdev_dbg(dev, "circular route to SSGN %pI4\n", |
| &pctx->peer_addr_ip4.s_addr); |
| dev->stats.collisions++; |
| goto err_rt; |
| } |
| |
| /* This is similar to tnl_update_pmtu(). */ |
| df = iph->frag_off; |
| if (df) { |
| mtu = dst_mtu(&rt->dst) - dev->hard_header_len - |
| sizeof(struct iphdr) - sizeof(struct udphdr); |
| switch (pctx->gtp_version) { |
| case GTP_V0: |
| mtu -= sizeof(struct gtp0_header); |
| break; |
| case GTP_V1: |
| mtu -= sizeof(struct gtp1_header); |
| break; |
| } |
| } else { |
| mtu = dst_mtu(&rt->dst); |
| } |
| |
| rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu, false); |
| |
| if (iph->frag_off & htons(IP_DF) && |
| ((!skb_is_gso(skb) && skb->len > mtu) || |
| (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu)))) { |
| netdev_dbg(dev, "packet too big, fragmentation needed\n"); |
| icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
| htonl(mtu)); |
| goto err_rt; |
| } |
| |
| gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev); |
| gtp_push_header(skb, pktinfo); |
| |
| return 0; |
| err_rt: |
| ip_rt_put(rt); |
| err: |
| return -EBADMSG; |
| } |
| |
| static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| unsigned int proto = ntohs(skb->protocol); |
| struct gtp_pktinfo pktinfo; |
| int err; |
| |
| /* Ensure there is sufficient headroom. */ |
| if (skb_cow_head(skb, dev->needed_headroom)) |
| goto tx_err; |
| |
| skb_reset_inner_headers(skb); |
| |
| /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */ |
| rcu_read_lock(); |
| switch (proto) { |
| case ETH_P_IP: |
| err = gtp_build_skb_ip4(skb, dev, &pktinfo); |
| break; |
| default: |
| err = -EOPNOTSUPP; |
| break; |
| } |
| rcu_read_unlock(); |
| |
| if (err < 0) |
| goto tx_err; |
| |
| switch (proto) { |
| case ETH_P_IP: |
| netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n", |
| &pktinfo.iph->saddr, &pktinfo.iph->daddr); |
| udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb, |
| pktinfo.fl4.saddr, pktinfo.fl4.daddr, |
| pktinfo.iph->tos, |
| ip4_dst_hoplimit(&pktinfo.rt->dst), |
| 0, |
| pktinfo.gtph_port, pktinfo.gtph_port, |
| !net_eq(sock_net(pktinfo.pctx->sk), |
| dev_net(dev)), |
| false); |
| break; |
| } |
| |
| return NETDEV_TX_OK; |
| tx_err: |
| dev->stats.tx_errors++; |
| dev_kfree_skb(skb); |
| return NETDEV_TX_OK; |
| } |
| |
| static const struct net_device_ops gtp_netdev_ops = { |
| .ndo_init = gtp_dev_init, |
| .ndo_uninit = gtp_dev_uninit, |
| .ndo_start_xmit = gtp_dev_xmit, |
| .ndo_get_stats64 = dev_get_tstats64, |
| }; |
| |
| static const struct device_type gtp_type = { |
| .name = "gtp", |
| }; |
| |
| static void gtp_link_setup(struct net_device *dev) |
| { |
| unsigned int max_gtp_header_len = sizeof(struct iphdr) + |
| sizeof(struct udphdr) + |
| sizeof(struct gtp0_header); |
| |
| dev->netdev_ops = >p_netdev_ops; |
| dev->needs_free_netdev = true; |
| SET_NETDEV_DEVTYPE(dev, >p_type); |
| |
| dev->hard_header_len = 0; |
| dev->addr_len = 0; |
| dev->mtu = ETH_DATA_LEN - max_gtp_header_len; |
| |
| /* Zero header length. */ |
| dev->type = ARPHRD_NONE; |
| dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
| |
| dev->priv_flags |= IFF_NO_QUEUE; |
| dev->features |= NETIF_F_LLTX; |
| netif_keep_dst(dev); |
| |
| dev->needed_headroom = LL_MAX_HEADER + max_gtp_header_len; |
| } |
| |
| static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize); |
| static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]); |
| |
| static void gtp_destructor(struct net_device *dev) |
| { |
| struct gtp_dev *gtp = netdev_priv(dev); |
| |
| kfree(gtp->addr_hash); |
| kfree(gtp->tid_hash); |
| } |
| |
| static int gtp_newlink(struct net *src_net, struct net_device *dev, |
| struct nlattr *tb[], struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| struct gtp_dev *gtp; |
| struct gtp_net *gn; |
| int hashsize, err; |
| |
| if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1]) |
| return -EINVAL; |
| |
| gtp = netdev_priv(dev); |
| |
| if (!data[IFLA_GTP_PDP_HASHSIZE]) { |
| hashsize = 1024; |
| } else { |
| hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]); |
| if (!hashsize) |
| hashsize = 1024; |
| } |
| |
| err = gtp_hashtable_new(gtp, hashsize); |
| if (err < 0) |
| return err; |
| |
| err = gtp_encap_enable(gtp, data); |
| if (err < 0) |
| goto out_hashtable; |
| |
| err = register_netdevice(dev); |
| if (err < 0) { |
| netdev_dbg(dev, "failed to register new netdev %d\n", err); |
| goto out_encap; |
| } |
| |
| gn = net_generic(dev_net(dev), gtp_net_id); |
| list_add_rcu(>p->list, &gn->gtp_dev_list); |
| dev->priv_destructor = gtp_destructor; |
| |
| netdev_dbg(dev, "registered new GTP interface\n"); |
| |
| return 0; |
| |
| out_encap: |
| gtp_encap_disable(gtp); |
| out_hashtable: |
| kfree(gtp->addr_hash); |
| kfree(gtp->tid_hash); |
| return err; |
| } |
| |
| static void gtp_dellink(struct net_device *dev, struct list_head *head) |
| { |
| struct gtp_dev *gtp = netdev_priv(dev); |
| struct pdp_ctx *pctx; |
| int i; |
| |
| for (i = 0; i < gtp->hash_size; i++) |
| hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) |
| pdp_context_delete(pctx); |
| |
| list_del_rcu(>p->list); |
| unregister_netdevice_queue(dev, head); |
| } |
| |
| static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = { |
| [IFLA_GTP_FD0] = { .type = NLA_U32 }, |
| [IFLA_GTP_FD1] = { .type = NLA_U32 }, |
| [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 }, |
| [IFLA_GTP_ROLE] = { .type = NLA_U32 }, |
| }; |
| |
| static int gtp_validate(struct nlattr *tb[], struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| if (!data) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static size_t gtp_get_size(const struct net_device *dev) |
| { |
| return nla_total_size(sizeof(__u32)) + /* IFLA_GTP_PDP_HASHSIZE */ |
| nla_total_size(sizeof(__u32)); /* IFLA_GTP_ROLE */ |
| } |
| |
| static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| { |
| struct gtp_dev *gtp = netdev_priv(dev); |
| |
| if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size)) |
| goto nla_put_failure; |
| if (nla_put_u32(skb, IFLA_GTP_ROLE, gtp->role)) |
| goto nla_put_failure; |
| |
| return 0; |
| |
| nla_put_failure: |
| return -EMSGSIZE; |
| } |
| |
| static struct rtnl_link_ops gtp_link_ops __read_mostly = { |
| .kind = "gtp", |
| .maxtype = IFLA_GTP_MAX, |
| .policy = gtp_policy, |
| .priv_size = sizeof(struct gtp_dev), |
| .setup = gtp_link_setup, |
| .validate = gtp_validate, |
| .newlink = gtp_newlink, |
| .dellink = gtp_dellink, |
| .get_size = gtp_get_size, |
| .fill_info = gtp_fill_info, |
| }; |
| |
| static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize) |
| { |
| int i; |
| |
| gtp->addr_hash = kmalloc_array(hsize, sizeof(struct hlist_head), |
| GFP_KERNEL | __GFP_NOWARN); |
| if (gtp->addr_hash == NULL) |
| return -ENOMEM; |
| |
| gtp->tid_hash = kmalloc_array(hsize, sizeof(struct hlist_head), |
| GFP_KERNEL | __GFP_NOWARN); |
| if (gtp->tid_hash == NULL) |
| goto err1; |
| |
| gtp->hash_size = hsize; |
| |
| for (i = 0; i < hsize; i++) { |
| INIT_HLIST_HEAD(>p->addr_hash[i]); |
| INIT_HLIST_HEAD(>p->tid_hash[i]); |
| } |
| return 0; |
| err1: |
| kfree(gtp->addr_hash); |
| return -ENOMEM; |
| } |
| |
| static struct sock *gtp_encap_enable_socket(int fd, int type, |
| struct gtp_dev *gtp) |
| { |
| struct udp_tunnel_sock_cfg tuncfg = {NULL}; |
| struct socket *sock; |
| struct sock *sk; |
| int err; |
| |
| pr_debug("enable gtp on %d, %d\n", fd, type); |
| |
| sock = sockfd_lookup(fd, &err); |
| if (!sock) { |
| pr_debug("gtp socket fd=%d not found\n", fd); |
| return NULL; |
| } |
| |
| sk = sock->sk; |
| if (sk->sk_protocol != IPPROTO_UDP || |
| sk->sk_type != SOCK_DGRAM || |
| (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) { |
| pr_debug("socket fd=%d not UDP\n", fd); |
| sk = ERR_PTR(-EINVAL); |
| goto out_sock; |
| } |
| |
| lock_sock(sk); |
| if (sk->sk_user_data) { |
| sk = ERR_PTR(-EBUSY); |
| goto out_rel_sock; |
| } |
| |
| sock_hold(sk); |
| |
| tuncfg.sk_user_data = gtp; |
| tuncfg.encap_type = type; |
| tuncfg.encap_rcv = gtp_encap_recv; |
| tuncfg.encap_destroy = gtp_encap_destroy; |
| |
| setup_udp_tunnel_sock(sock_net(sock->sk), sock, &tuncfg); |
| |
| out_rel_sock: |
| release_sock(sock->sk); |
| out_sock: |
| sockfd_put(sock); |
| return sk; |
| } |
| |
| static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]) |
| { |
| struct sock *sk1u = NULL; |
| struct sock *sk0 = NULL; |
| unsigned int role = GTP_ROLE_GGSN; |
| |
| if (data[IFLA_GTP_FD0]) { |
| u32 fd0 = nla_get_u32(data[IFLA_GTP_FD0]); |
| |
| sk0 = gtp_encap_enable_socket(fd0, UDP_ENCAP_GTP0, gtp); |
| if (IS_ERR(sk0)) |
| return PTR_ERR(sk0); |
| } |
| |
| if (data[IFLA_GTP_FD1]) { |
| u32 fd1 = nla_get_u32(data[IFLA_GTP_FD1]); |
| |
| sk1u = gtp_encap_enable_socket(fd1, UDP_ENCAP_GTP1U, gtp); |
| if (IS_ERR(sk1u)) { |
| gtp_encap_disable_sock(sk0); |
| return PTR_ERR(sk1u); |
| } |
| } |
| |
| if (data[IFLA_GTP_ROLE]) { |
| role = nla_get_u32(data[IFLA_GTP_ROLE]); |
| if (role > GTP_ROLE_SGSN) { |
| gtp_encap_disable_sock(sk0); |
| gtp_encap_disable_sock(sk1u); |
| return -EINVAL; |
| } |
| } |
| |
| gtp->sk0 = sk0; |
| gtp->sk1u = sk1u; |
| gtp->role = role; |
| |
| return 0; |
| } |
| |
| static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[]) |
| { |
| struct gtp_dev *gtp = NULL; |
| struct net_device *dev; |
| struct net *net; |
| |
| /* Examine the link attributes and figure out which network namespace |
| * we are talking about. |
| */ |
| if (nla[GTPA_NET_NS_FD]) |
| net = get_net_ns_by_fd(nla_get_u32(nla[GTPA_NET_NS_FD])); |
| else |
| net = get_net(src_net); |
| |
| if (IS_ERR(net)) |
| return NULL; |
| |
| /* Check if there's an existing gtpX device to configure */ |
| dev = dev_get_by_index_rcu(net, nla_get_u32(nla[GTPA_LINK])); |
| if (dev && dev->netdev_ops == >p_netdev_ops) |
| gtp = netdev_priv(dev); |
| |
| put_net(net); |
| return gtp; |
| } |
| |
| static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info) |
| { |
| pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]); |
| pctx->af = AF_INET; |
| pctx->peer_addr_ip4.s_addr = |
| nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]); |
| pctx->ms_addr_ip4.s_addr = |
| nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); |
| |
| switch (pctx->gtp_version) { |
| case GTP_V0: |
| /* According to TS 09.60, sections 7.5.1 and 7.5.2, the flow |
| * label needs to be the same for uplink and downlink packets, |
| * so let's annotate this. |
| */ |
| pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]); |
| pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]); |
| break; |
| case GTP_V1: |
| pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]); |
| pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static struct pdp_ctx *gtp_pdp_add(struct gtp_dev *gtp, struct sock *sk, |
| struct genl_info *info) |
| { |
| struct pdp_ctx *pctx, *pctx_tid = NULL; |
| struct net_device *dev = gtp->dev; |
| u32 hash_ms, hash_tid = 0; |
| unsigned int version; |
| bool found = false; |
| __be32 ms_addr; |
| |
| ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]); |
| hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size; |
| version = nla_get_u32(info->attrs[GTPA_VERSION]); |
| |
| pctx = ipv4_pdp_find(gtp, ms_addr); |
| if (pctx) |
| found = true; |
| if (version == GTP_V0) |
| pctx_tid = gtp0_pdp_find(gtp, |
| nla_get_u64(info->attrs[GTPA_TID])); |
| else if (version == GTP_V1) |
| pctx_tid = gtp1_pdp_find(gtp, |
| nla_get_u32(info->attrs[GTPA_I_TEI])); |
| if (pctx_tid) |
| found = true; |
| |
| if (found) { |
| if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) |
| return ERR_PTR(-EEXIST); |
| if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE) |
| return ERR_PTR(-EOPNOTSUPP); |
| |
| if (pctx && pctx_tid) |
| return ERR_PTR(-EEXIST); |
| if (!pctx) |
| pctx = pctx_tid; |
| |
| ipv4_pdp_fill(pctx, info); |
| |
| if (pctx->gtp_version == GTP_V0) |
| netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n", |
| pctx->u.v0.tid, pctx); |
| else if (pctx->gtp_version == GTP_V1) |
| netdev_dbg(dev, "GTPv1-U: update tunnel id = %x/%x (pdp %p)\n", |
| pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); |
| |
| return pctx; |
| |
| } |
| |
| pctx = kmalloc(sizeof(*pctx), GFP_ATOMIC); |
| if (pctx == NULL) |
| return ERR_PTR(-ENOMEM); |
| |
| sock_hold(sk); |
| pctx->sk = sk; |
| pctx->dev = gtp->dev; |
| ipv4_pdp_fill(pctx, info); |
| atomic_set(&pctx->tx_seq, 0); |
| |
| switch (pctx->gtp_version) { |
| case GTP_V0: |
| /* TS 09.60: "The flow label identifies unambiguously a GTP |
| * flow.". We use the tid for this instead, I cannot find a |
| * situation in which this doesn't unambiguosly identify the |
| * PDP context. |
| */ |
| hash_tid = gtp0_hashfn(pctx->u.v0.tid) % gtp->hash_size; |
| break; |
| case GTP_V1: |
| hash_tid = gtp1u_hashfn(pctx->u.v1.i_tei) % gtp->hash_size; |
| break; |
| } |
| |
| hlist_add_head_rcu(&pctx->hlist_addr, >p->addr_hash[hash_ms]); |
| hlist_add_head_rcu(&pctx->hlist_tid, >p->tid_hash[hash_tid]); |
| |
| switch (pctx->gtp_version) { |
| case GTP_V0: |
| netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n", |
| pctx->u.v0.tid, &pctx->peer_addr_ip4, |
| &pctx->ms_addr_ip4, pctx); |
| break; |
| case GTP_V1: |
| netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n", |
| pctx->u.v1.i_tei, pctx->u.v1.o_tei, |
| &pctx->peer_addr_ip4, &pctx->ms_addr_ip4, pctx); |
| break; |
| } |
| |
| return pctx; |
| } |
| |
| static void pdp_context_free(struct rcu_head *head) |
| { |
| struct pdp_ctx *pctx = container_of(head, struct pdp_ctx, rcu_head); |
| |
| sock_put(pctx->sk); |
| kfree(pctx); |
| } |
| |
| static void pdp_context_delete(struct pdp_ctx *pctx) |
| { |
| hlist_del_rcu(&pctx->hlist_tid); |
| hlist_del_rcu(&pctx->hlist_addr); |
| call_rcu(&pctx->rcu_head, pdp_context_free); |
| } |
| |
| static int gtp_tunnel_notify(struct pdp_ctx *pctx, u8 cmd, gfp_t allocation); |
| |
| static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info) |
| { |
| unsigned int version; |
| struct pdp_ctx *pctx; |
| struct gtp_dev *gtp; |
| struct sock *sk; |
| int err; |
| |
| if (!info->attrs[GTPA_VERSION] || |
| !info->attrs[GTPA_LINK] || |
| !info->attrs[GTPA_PEER_ADDRESS] || |
| !info->attrs[GTPA_MS_ADDRESS]) |
| return -EINVAL; |
| |
| version = nla_get_u32(info->attrs[GTPA_VERSION]); |
| |
| switch (version) { |
| case GTP_V0: |
| if (!info->attrs[GTPA_TID] || |
| !info->attrs[GTPA_FLOW]) |
| return -EINVAL; |
| break; |
| case GTP_V1: |
| if (!info->attrs[GTPA_I_TEI] || |
| !info->attrs[GTPA_O_TEI]) |
| return -EINVAL; |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| |
| rtnl_lock(); |
| |
| gtp = gtp_find_dev(sock_net(skb->sk), info->attrs); |
| if (!gtp) { |
| err = -ENODEV; |
| goto out_unlock; |
| } |
| |
| if (version == GTP_V0) |
| sk = gtp->sk0; |
| else if (version == GTP_V1) |
| sk = gtp->sk1u; |
| else |
| sk = NULL; |
| |
| if (!sk) { |
| err = -ENODEV; |
| goto out_unlock; |
| } |
| |
| pctx = gtp_pdp_add(gtp, sk, info); |
| if (IS_ERR(pctx)) { |
| err = PTR_ERR(pctx); |
| } else { |
| gtp_tunnel_notify(pctx, GTP_CMD_NEWPDP, GFP_KERNEL); |
| err = 0; |
| } |
| |
| out_unlock: |
| rtnl_unlock(); |
| return err; |
| } |
| |
| static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net, |
| struct nlattr *nla[]) |
| { |
| struct gtp_dev *gtp; |
| |
| gtp = gtp_find_dev(net, nla); |
| if (!gtp) |
| return ERR_PTR(-ENODEV); |
| |
| if (nla[GTPA_MS_ADDRESS]) { |
| __be32 ip = nla_get_be32(nla[GTPA_MS_ADDRESS]); |
| |
| return ipv4_pdp_find(gtp, ip); |
| } else if (nla[GTPA_VERSION]) { |
| u32 gtp_version = nla_get_u32(nla[GTPA_VERSION]); |
| |
| if (gtp_version == GTP_V0 && nla[GTPA_TID]) |
| return gtp0_pdp_find(gtp, nla_get_u64(nla[GTPA_TID])); |
| else if (gtp_version == GTP_V1 && nla[GTPA_I_TEI]) |
| return gtp1_pdp_find(gtp, nla_get_u32(nla[GTPA_I_TEI])); |
| } |
| |
| return ERR_PTR(-EINVAL); |
| } |
| |
| static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[]) |
| { |
| struct pdp_ctx *pctx; |
| |
| if (nla[GTPA_LINK]) |
| pctx = gtp_find_pdp_by_link(net, nla); |
| else |
| pctx = ERR_PTR(-EINVAL); |
| |
| if (!pctx) |
| pctx = ERR_PTR(-ENOENT); |
| |
| return pctx; |
| } |
| |
| static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct pdp_ctx *pctx; |
| int err = 0; |
| |
| if (!info->attrs[GTPA_VERSION]) |
| return -EINVAL; |
| |
| rcu_read_lock(); |
| |
| pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs); |
| if (IS_ERR(pctx)) { |
| err = PTR_ERR(pctx); |
| goto out_unlock; |
| } |
| |
| if (pctx->gtp_version == GTP_V0) |
| netdev_dbg(pctx->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n", |
| pctx->u.v0.tid, pctx); |
| else if (pctx->gtp_version == GTP_V1) |
| netdev_dbg(pctx->dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n", |
| pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx); |
| |
| gtp_tunnel_notify(pctx, GTP_CMD_DELPDP, GFP_ATOMIC); |
| pdp_context_delete(pctx); |
| |
| out_unlock: |
| rcu_read_unlock(); |
| return err; |
| } |
| |
| static struct genl_family gtp_genl_family; |
| |
| enum gtp_multicast_groups { |
| GTP_GENL_MCGRP, |
| }; |
| |
| static const struct genl_multicast_group gtp_genl_mcgrps[] = { |
| [GTP_GENL_MCGRP] = { .name = GTP_GENL_MCGRP_NAME }, |
| }; |
| |
| static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq, |
| int flags, u32 type, struct pdp_ctx *pctx) |
| { |
| void *genlh; |
| |
| genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, flags, |
| type); |
| if (genlh == NULL) |
| goto nlmsg_failure; |
| |
| if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) || |
| nla_put_u32(skb, GTPA_LINK, pctx->dev->ifindex) || |
| nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer_addr_ip4.s_addr) || |
| nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr)) |
| goto nla_put_failure; |
| |
| switch (pctx->gtp_version) { |
| case GTP_V0: |
| if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) || |
| nla_put_u16(skb, GTPA_FLOW, pctx->u.v0.flow)) |
| goto nla_put_failure; |
| break; |
| case GTP_V1: |
| if (nla_put_u32(skb, GTPA_I_TEI, pctx->u.v1.i_tei) || |
| nla_put_u32(skb, GTPA_O_TEI, pctx->u.v1.o_tei)) |
| goto nla_put_failure; |
| break; |
| } |
| genlmsg_end(skb, genlh); |
| return 0; |
| |
| nlmsg_failure: |
| nla_put_failure: |
| genlmsg_cancel(skb, genlh); |
| return -EMSGSIZE; |
| } |
| |
| static int gtp_tunnel_notify(struct pdp_ctx *pctx, u8 cmd, gfp_t allocation) |
| { |
| struct sk_buff *msg; |
| int ret; |
| |
| msg = nlmsg_new(NLMSG_DEFAULT_SIZE, allocation); |
| if (!msg) |
| return -ENOMEM; |
| |
| ret = gtp_genl_fill_info(msg, 0, 0, 0, cmd, pctx); |
| if (ret < 0) { |
| nlmsg_free(msg); |
| return ret; |
| } |
| |
| ret = genlmsg_multicast_netns(>p_genl_family, dev_net(pctx->dev), msg, |
| 0, GTP_GENL_MCGRP, GFP_ATOMIC); |
| return ret; |
| } |
| |
| static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct pdp_ctx *pctx = NULL; |
| struct sk_buff *skb2; |
| int err; |
| |
| if (!info->attrs[GTPA_VERSION]) |
| return -EINVAL; |
| |
| rcu_read_lock(); |
| |
| pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs); |
| if (IS_ERR(pctx)) { |
| err = PTR_ERR(pctx); |
| goto err_unlock; |
| } |
| |
| skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); |
| if (skb2 == NULL) { |
| err = -ENOMEM; |
| goto err_unlock; |
| } |
| |
| err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid, info->snd_seq, |
| 0, info->nlhdr->nlmsg_type, pctx); |
| if (err < 0) |
| goto err_unlock_free; |
| |
| rcu_read_unlock(); |
| return genlmsg_unicast(genl_info_net(info), skb2, info->snd_portid); |
| |
| err_unlock_free: |
| kfree_skb(skb2); |
| err_unlock: |
| rcu_read_unlock(); |
| return err; |
| } |
| |
| static int gtp_genl_dump_pdp(struct sk_buff *skb, |
| struct netlink_callback *cb) |
| { |
| struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp; |
| int i, j, bucket = cb->args[0], skip = cb->args[1]; |
| struct net *net = sock_net(skb->sk); |
| struct pdp_ctx *pctx; |
| struct gtp_net *gn; |
| |
| gn = net_generic(net, gtp_net_id); |
| |
| if (cb->args[4]) |
| return 0; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) { |
| if (last_gtp && last_gtp != gtp) |
| continue; |
| else |
| last_gtp = NULL; |
| |
| for (i = bucket; i < gtp->hash_size; i++) { |
| j = 0; |
| hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], |
| hlist_tid) { |
| if (j >= skip && |
| gtp_genl_fill_info(skb, |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| NLM_F_MULTI, |
| cb->nlh->nlmsg_type, pctx)) { |
| cb->args[0] = i; |
| cb->args[1] = j; |
| cb->args[2] = (unsigned long)gtp; |
| goto out; |
| } |
| j++; |
| } |
| skip = 0; |
| } |
| bucket = 0; |
| } |
| cb->args[4] = 1; |
| out: |
| rcu_read_unlock(); |
| return skb->len; |
| } |
| |
| static const struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = { |
| [GTPA_LINK] = { .type = NLA_U32, }, |
| [GTPA_VERSION] = { .type = NLA_U32, }, |
| [GTPA_TID] = { .type = NLA_U64, }, |
| [GTPA_PEER_ADDRESS] = { .type = NLA_U32, }, |
| [GTPA_MS_ADDRESS] = { .type = NLA_U32, }, |
| [GTPA_FLOW] = { .type = NLA_U16, }, |
| [GTPA_NET_NS_FD] = { .type = NLA_U32, }, |
| [GTPA_I_TEI] = { .type = NLA_U32, }, |
| [GTPA_O_TEI] = { .type = NLA_U32, }, |
| }; |
| |
| static const struct genl_small_ops gtp_genl_ops[] = { |
| { |
| .cmd = GTP_CMD_NEWPDP, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .doit = gtp_genl_new_pdp, |
| .flags = GENL_ADMIN_PERM, |
| }, |
| { |
| .cmd = GTP_CMD_DELPDP, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .doit = gtp_genl_del_pdp, |
| .flags = GENL_ADMIN_PERM, |
| }, |
| { |
| .cmd = GTP_CMD_GETPDP, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .doit = gtp_genl_get_pdp, |
| .dumpit = gtp_genl_dump_pdp, |
| .flags = GENL_ADMIN_PERM, |
| }, |
| }; |
| |
| static struct genl_family gtp_genl_family __ro_after_init = { |
| .name = "gtp", |
| .version = 0, |
| .hdrsize = 0, |
| .maxattr = GTPA_MAX, |
| .policy = gtp_genl_policy, |
| .netnsok = true, |
| .module = THIS_MODULE, |
| .small_ops = gtp_genl_ops, |
| .n_small_ops = ARRAY_SIZE(gtp_genl_ops), |
| .mcgrps = gtp_genl_mcgrps, |
| .n_mcgrps = ARRAY_SIZE(gtp_genl_mcgrps), |
| }; |
| |
| static int __net_init gtp_net_init(struct net *net) |
| { |
| struct gtp_net *gn = net_generic(net, gtp_net_id); |
| |
| INIT_LIST_HEAD(&gn->gtp_dev_list); |
| return 0; |
| } |
| |
| static void __net_exit gtp_net_exit(struct net *net) |
| { |
| struct gtp_net *gn = net_generic(net, gtp_net_id); |
| struct gtp_dev *gtp; |
| LIST_HEAD(list); |
| |
| rtnl_lock(); |
| list_for_each_entry(gtp, &gn->gtp_dev_list, list) |
| gtp_dellink(gtp->dev, &list); |
| |
| unregister_netdevice_many(&list); |
| rtnl_unlock(); |
| } |
| |
| static struct pernet_operations gtp_net_ops = { |
| .init = gtp_net_init, |
| .exit = gtp_net_exit, |
| .id = >p_net_id, |
| .size = sizeof(struct gtp_net), |
| }; |
| |
| static int __init gtp_init(void) |
| { |
| int err; |
| |
| get_random_bytes(>p_h_initval, sizeof(gtp_h_initval)); |
| |
| err = rtnl_link_register(>p_link_ops); |
| if (err < 0) |
| goto error_out; |
| |
| err = genl_register_family(>p_genl_family); |
| if (err < 0) |
| goto unreg_rtnl_link; |
| |
| err = register_pernet_subsys(>p_net_ops); |
| if (err < 0) |
| goto unreg_genl_family; |
| |
| pr_info("GTP module loaded (pdp ctx size %zd bytes)\n", |
| sizeof(struct pdp_ctx)); |
| return 0; |
| |
| unreg_genl_family: |
| genl_unregister_family(>p_genl_family); |
| unreg_rtnl_link: |
| rtnl_link_unregister(>p_link_ops); |
| error_out: |
| pr_err("error loading GTP module loaded\n"); |
| return err; |
| } |
| late_initcall(gtp_init); |
| |
| static void __exit gtp_fini(void) |
| { |
| genl_unregister_family(>p_genl_family); |
| rtnl_link_unregister(>p_link_ops); |
| unregister_pernet_subsys(>p_net_ops); |
| |
| pr_info("GTP module unloaded\n"); |
| } |
| module_exit(gtp_fini); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>"); |
| MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic"); |
| MODULE_ALIAS_RTNL_LINK("gtp"); |
| MODULE_ALIAS_GENL_FAMILY("gtp"); |