1 /* GTP according to GSM TS 09.60 / 3GPP TS 29.060
3 * (C) 2012-2014 by sysmocom - s.f.m.c. GmbH
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18 #include <linux/module.h>
19 #include <linux/version.h>
20 #include <linux/skbuff.h>
21 #include <linux/udp.h>
22 #include <linux/rculist.h>
23 #include <linux/jhash.h>
24 #include <linux/if_tunnel.h>
25 #include <linux/net.h>
26 #include <linux/file.h>
27 #include <linux/gtp.h>
29 #include <net/net_namespace.h>
30 #include <net/protocol.h>
33 #include <net/udp_tunnel.h>
36 #include <net/genetlink.h>
37 #include <net/netns/generic.h>
40 /* An active session for the subscriber. */
42 struct hlist_node hlist_tid;
43 struct hlist_node hlist_addr;
59 struct in_addr ms_addr_ip4;
60 struct in_addr sgsn_addr_ip4;
63 struct rcu_head rcu_head;
66 /* One instance of the GTP device. */
68 struct list_head list;
71 struct socket *sock1u;
74 struct net_device *dev;
76 unsigned int hash_size;
77 struct hlist_head *tid_hash;
78 struct hlist_head *addr_hash;
81 static int gtp_net_id __read_mostly;
84 struct list_head gtp_dev_list;
87 static u32 gtp_h_initval;
89 static inline u32 gtp0_hashfn(u64 tid)
91 u32 *tid32 = (u32 *) &tid;
92 return jhash_2words(tid32[0], tid32[1], gtp_h_initval);
95 static inline u32 gtp1u_hashfn(u32 tid)
97 return jhash_1word(tid, gtp_h_initval);
100 static inline u32 ipv4_hashfn(__be32 ip)
102 return jhash_1word((__force u32)ip, gtp_h_initval);
105 /* Resolve a PDP context structure based on the 64bit TID. */
106 static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid)
108 struct hlist_head *head;
111 head = >p->tid_hash[gtp0_hashfn(tid) % gtp->hash_size];
113 hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
114 if (pdp->gtp_version == GTP_V0 &&
115 pdp->u.v0.tid == tid)
121 /* Resolve a PDP context structure based on the 32bit TEI. */
122 static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid)
124 struct hlist_head *head;
127 head = >p->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size];
129 hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
130 if (pdp->gtp_version == GTP_V1 &&
131 pdp->u.v1.i_tei == tid)
137 /* Resolve a PDP context based on IPv4 address of MS. */
138 static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr)
140 struct hlist_head *head;
143 head = >p->addr_hash[ipv4_hashfn(ms_addr) % gtp->hash_size];
145 hlist_for_each_entry_rcu(pdp, head, hlist_addr) {
146 if (pdp->af == AF_INET &&
147 pdp->ms_addr_ip4.s_addr == ms_addr)
154 static bool gtp_check_src_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx,
159 if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr)))
162 iph = (struct iphdr *)(skb->data + hdrlen + sizeof(struct iphdr));
164 return iph->saddr != pctx->ms_addr_ip4.s_addr;
167 /* Check if the inner IP source address in this packet is assigned to any
168 * existing mobile subscriber.
170 static bool gtp_check_src_ms(struct sk_buff *skb, struct pdp_ctx *pctx,
173 switch (ntohs(skb->protocol)) {
175 return gtp_check_src_ms_ipv4(skb, pctx, hdrlen);
180 /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */
181 static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
184 unsigned int hdrlen = sizeof(struct udphdr) +
185 sizeof(struct gtp0_header);
186 struct gtp0_header *gtp0;
187 struct pdp_ctx *pctx;
190 if (!pskb_may_pull(skb, hdrlen))
193 gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));
195 if ((gtp0->flags >> 5) != GTP_V0)
198 if (gtp0->type != GTP_TPDU)
202 pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid));
204 netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
209 if (!gtp_check_src_ms(skb, pctx, hdrlen)) {
210 netdev_dbg(gtp->dev, "No PDP ctx for this MS\n");
216 /* Get rid of the GTP + UDP headers. */
217 return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet);
223 static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
226 unsigned int hdrlen = sizeof(struct udphdr) +
227 sizeof(struct gtp1_header);
228 struct gtp1_header *gtp1;
229 struct pdp_ctx *pctx;
232 if (!pskb_may_pull(skb, hdrlen))
235 gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
237 if ((gtp1->flags >> 5) != GTP_V1)
240 if (gtp1->type != GTP_TPDU)
243 /* From 29.060: "This field shall be present if and only if any one or
244 * more of the S, PN and E flags are set.".
246 * If any of the bit is set, then the remaining ones also have to be
249 if (gtp1->flags & GTP1_F_MASK)
252 /* Make sure the header is larger enough, including extensions. */
253 if (!pskb_may_pull(skb, hdrlen))
256 gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
259 pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
261 netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
266 if (!gtp_check_src_ms(skb, pctx, hdrlen)) {
267 netdev_dbg(gtp->dev, "No PDP ctx for this MS\n");
273 /* Get rid of the GTP + UDP headers. */
274 return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet);
280 static void gtp_encap_disable(struct gtp_dev *gtp)
282 if (gtp->sock0 && gtp->sock0->sk) {
283 udp_sk(gtp->sock0->sk)->encap_type = 0;
284 rcu_assign_sk_user_data(gtp->sock0->sk, NULL);
286 if (gtp->sock1u && gtp->sock1u->sk) {
287 udp_sk(gtp->sock1u->sk)->encap_type = 0;
288 rcu_assign_sk_user_data(gtp->sock1u->sk, NULL);
295 static void gtp_encap_destroy(struct sock *sk)
299 gtp = rcu_dereference_sk_user_data(sk);
301 gtp_encap_disable(gtp);
304 /* UDP encapsulation receive handler. See net/ipv4/udp.c.
305 * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket.
307 static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb)
309 struct pcpu_sw_netstats *stats;
314 gtp = rcu_dereference_sk_user_data(sk);
318 netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk);
320 xnet = !net_eq(gtp->net, dev_net(gtp->dev));
322 switch (udp_sk(sk)->encap_type) {
324 netdev_dbg(gtp->dev, "received GTP0 packet\n");
325 ret = gtp0_udp_encap_recv(gtp, skb, xnet);
327 case UDP_ENCAP_GTP1U:
328 netdev_dbg(gtp->dev, "received GTP1U packet\n");
329 ret = gtp1u_udp_encap_recv(gtp, skb, xnet);
332 ret = -1; /* Shouldn't happen. */
337 netdev_dbg(gtp->dev, "pass up to the process\n");
340 netdev_dbg(gtp->dev, "forwarding packet from GGSN to uplink\n");
343 netdev_dbg(gtp->dev, "GTP packet has been dropped\n");
348 /* Now that the UDP and the GTP header have been removed, set up the
349 * new network header. This is required by the upper layer to
350 * calculate the transport header.
352 skb_reset_network_header(skb);
356 stats = this_cpu_ptr(gtp->dev->tstats);
357 u64_stats_update_begin(&stats->syncp);
359 stats->rx_bytes += skb->len;
360 u64_stats_update_end(&stats->syncp);
367 static int gtp_dev_init(struct net_device *dev)
369 struct gtp_dev *gtp = netdev_priv(dev);
373 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
380 static void gtp_dev_uninit(struct net_device *dev)
382 struct gtp_dev *gtp = netdev_priv(dev);
384 gtp_encap_disable(gtp);
385 free_percpu(dev->tstats);
388 static struct rtable *ip4_route_output_gtp(struct net *net, struct flowi4 *fl4,
389 const struct sock *sk, __be32 daddr)
391 memset(fl4, 0, sizeof(*fl4));
392 fl4->flowi4_oif = sk->sk_bound_dev_if;
394 fl4->saddr = inet_sk(sk)->inet_saddr;
395 fl4->flowi4_tos = RT_CONN_FLAGS(sk);
396 fl4->flowi4_proto = sk->sk_protocol;
398 return ip_route_output_key(net, fl4);
401 static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
403 int payload_len = skb->len;
404 struct gtp0_header *gtp0;
406 gtp0 = (struct gtp0_header *) skb_push(skb, sizeof(*gtp0));
408 gtp0->flags = 0x1e; /* v0, GTP-non-prime. */
409 gtp0->type = GTP_TPDU;
410 gtp0->length = htons(payload_len);
411 gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff);
412 gtp0->flow = htons(pctx->u.v0.flow);
414 gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xff;
415 gtp0->tid = cpu_to_be64(pctx->u.v0.tid);
418 static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
420 int payload_len = skb->len;
421 struct gtp1_header *gtp1;
423 gtp1 = (struct gtp1_header *) skb_push(skb, sizeof(*gtp1));
425 /* Bits 8 7 6 5 4 3 2 1
426 * +--+--+--+--+--+--+--+--+
427 * |version |PT| 1| E| S|PN|
428 * +--+--+--+--+--+--+--+--+
431 gtp1->flags = 0x38; /* v1, GTP-non-prime. */
432 gtp1->type = GTP_TPDU;
433 gtp1->length = htons(payload_len);
434 gtp1->tid = htonl(pctx->u.v1.o_tei);
436 /* TODO: Suppport for extension header, sequence number and N-PDU.
437 * Update the length field if any of them is available.
446 struct pdp_ctx *pctx;
447 struct net_device *dev;
451 static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo)
453 switch (pktinfo->pctx->gtp_version) {
455 pktinfo->gtph_port = htons(GTP0_PORT);
456 gtp0_push_header(skb, pktinfo->pctx);
459 pktinfo->gtph_port = htons(GTP1U_PORT);
460 gtp1_push_header(skb, pktinfo->pctx);
465 static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo,
466 struct sock *sk, struct iphdr *iph,
467 struct pdp_ctx *pctx, struct rtable *rt,
469 struct net_device *dev)
473 pktinfo->pctx = pctx;
479 static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
480 struct gtp_pktinfo *pktinfo)
482 struct gtp_dev *gtp = netdev_priv(dev);
483 struct pdp_ctx *pctx;
491 /* Read the IP destination address and resolve the PDP context.
492 * Prepend PDP header with TEI/TID from PDP ctx.
495 pctx = ipv4_pdp_find(gtp, iph->daddr);
497 netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n",
501 netdev_dbg(dev, "found PDP context %p\n", pctx);
503 switch (pctx->gtp_version) {
512 sk = gtp->sock1u->sk;
521 netdev_dbg(dev, "no userspace socket is available, skip\n");
525 rt = ip4_route_output_gtp(sock_net(sk), &fl4, gtp->sock0->sk,
526 pctx->sgsn_addr_ip4.s_addr);
528 netdev_dbg(dev, "no route to SSGN %pI4\n",
529 &pctx->sgsn_addr_ip4.s_addr);
530 dev->stats.tx_carrier_errors++;
534 if (rt->dst.dev == dev) {
535 netdev_dbg(dev, "circular route to SSGN %pI4\n",
536 &pctx->sgsn_addr_ip4.s_addr);
537 dev->stats.collisions++;
543 /* This is similar to tnl_update_pmtu(). */
546 mtu = dst_mtu(&rt->dst) - dev->hard_header_len -
547 sizeof(struct iphdr) - sizeof(struct udphdr);
548 switch (pctx->gtp_version) {
550 mtu -= sizeof(struct gtp0_header);
553 mtu -= sizeof(struct gtp1_header);
557 mtu = dst_mtu(&rt->dst);
560 rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu);
562 if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) &&
563 mtu < ntohs(iph->tot_len)) {
564 netdev_dbg(dev, "packet too big, fragmentation needed\n");
565 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
566 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
571 gtp_set_pktinfo_ipv4(pktinfo, sk, iph, pctx, rt, &fl4, dev);
572 gtp_push_header(skb, pktinfo);
581 static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
583 unsigned int proto = ntohs(skb->protocol);
584 struct gtp_pktinfo pktinfo;
587 /* Ensure there is sufficient headroom. */
588 if (skb_cow_head(skb, dev->needed_headroom))
591 skb_reset_inner_headers(skb);
593 /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */
597 err = gtp_build_skb_ip4(skb, dev, &pktinfo);
610 netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n",
611 &pktinfo.iph->saddr, &pktinfo.iph->daddr);
612 udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb,
613 pktinfo.fl4.saddr, pktinfo.fl4.daddr,
615 ip4_dst_hoplimit(&pktinfo.rt->dst),
617 pktinfo.gtph_port, pktinfo.gtph_port,
624 dev->stats.tx_errors++;
629 static const struct net_device_ops gtp_netdev_ops = {
630 .ndo_init = gtp_dev_init,
631 .ndo_uninit = gtp_dev_uninit,
632 .ndo_start_xmit = gtp_dev_xmit,
633 .ndo_get_stats64 = ip_tunnel_get_stats64,
636 static void gtp_link_setup(struct net_device *dev)
638 dev->netdev_ops = >p_netdev_ops;
639 dev->destructor = free_netdev;
641 dev->hard_header_len = 0;
644 /* Zero header length. */
645 dev->type = ARPHRD_NONE;
646 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
648 dev->priv_flags |= IFF_NO_QUEUE;
649 dev->features |= NETIF_F_LLTX;
652 /* Assume largest header, ie. GTPv0. */
653 dev->needed_headroom = LL_MAX_HEADER +
654 sizeof(struct iphdr) +
655 sizeof(struct udphdr) +
656 sizeof(struct gtp0_header);
659 static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize);
660 static void gtp_hashtable_free(struct gtp_dev *gtp);
661 static int gtp_encap_enable(struct net_device *dev, struct gtp_dev *gtp,
662 int fd_gtp0, int fd_gtp1, struct net *src_net);
664 static int gtp_newlink(struct net *src_net, struct net_device *dev,
665 struct nlattr *tb[], struct nlattr *data[])
667 int hashsize, err, fd0, fd1;
671 if (!data[IFLA_GTP_FD0] || !data[IFLA_GTP_FD1])
674 gtp = netdev_priv(dev);
676 fd0 = nla_get_u32(data[IFLA_GTP_FD0]);
677 fd1 = nla_get_u32(data[IFLA_GTP_FD1]);
679 err = gtp_encap_enable(dev, gtp, fd0, fd1, src_net);
683 if (!data[IFLA_GTP_PDP_HASHSIZE])
686 hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]);
688 err = gtp_hashtable_new(gtp, hashsize);
692 err = register_netdevice(dev);
694 netdev_dbg(dev, "failed to register new netdev %d\n", err);
698 gn = net_generic(dev_net(dev), gtp_net_id);
699 list_add_rcu(>p->list, &gn->gtp_dev_list);
701 netdev_dbg(dev, "registered new GTP interface\n");
706 gtp_hashtable_free(gtp);
708 gtp_encap_disable(gtp);
713 static void gtp_dellink(struct net_device *dev, struct list_head *head)
715 struct gtp_dev *gtp = netdev_priv(dev);
717 gtp_encap_disable(gtp);
718 gtp_hashtable_free(gtp);
719 list_del_rcu(>p->list);
720 unregister_netdevice_queue(dev, head);
723 static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = {
724 [IFLA_GTP_FD0] = { .type = NLA_U32 },
725 [IFLA_GTP_FD1] = { .type = NLA_U32 },
726 [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 },
729 static int gtp_validate(struct nlattr *tb[], struct nlattr *data[])
737 static size_t gtp_get_size(const struct net_device *dev)
739 return nla_total_size(sizeof(__u32)); /* IFLA_GTP_PDP_HASHSIZE */
742 static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev)
744 struct gtp_dev *gtp = netdev_priv(dev);
746 if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size))
747 goto nla_put_failure;
755 static struct rtnl_link_ops gtp_link_ops __read_mostly = {
757 .maxtype = IFLA_GTP_MAX,
758 .policy = gtp_policy,
759 .priv_size = sizeof(struct gtp_dev),
760 .setup = gtp_link_setup,
761 .validate = gtp_validate,
762 .newlink = gtp_newlink,
763 .dellink = gtp_dellink,
764 .get_size = gtp_get_size,
765 .fill_info = gtp_fill_info,
768 static struct net *gtp_genl_get_net(struct net *src_net, struct nlattr *tb[])
772 /* Examine the link attributes and figure out which network namespace
773 * we are talking about.
775 if (tb[GTPA_NET_NS_FD])
776 net = get_net_ns_by_fd(nla_get_u32(tb[GTPA_NET_NS_FD]));
778 net = get_net(src_net);
783 static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize)
787 gtp->addr_hash = kmalloc(sizeof(struct hlist_head) * hsize, GFP_KERNEL);
788 if (gtp->addr_hash == NULL)
791 gtp->tid_hash = kmalloc(sizeof(struct hlist_head) * hsize, GFP_KERNEL);
792 if (gtp->tid_hash == NULL)
795 gtp->hash_size = hsize;
797 for (i = 0; i < hsize; i++) {
798 INIT_HLIST_HEAD(>p->addr_hash[i]);
799 INIT_HLIST_HEAD(>p->tid_hash[i]);
803 kfree(gtp->addr_hash);
807 static void gtp_hashtable_free(struct gtp_dev *gtp)
809 struct pdp_ctx *pctx;
812 for (i = 0; i < gtp->hash_size; i++) {
813 hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) {
814 hlist_del_rcu(&pctx->hlist_tid);
815 hlist_del_rcu(&pctx->hlist_addr);
816 kfree_rcu(pctx, rcu_head);
820 kfree(gtp->addr_hash);
821 kfree(gtp->tid_hash);
824 static int gtp_encap_enable(struct net_device *dev, struct gtp_dev *gtp,
825 int fd_gtp0, int fd_gtp1, struct net *src_net)
827 struct udp_tunnel_sock_cfg tuncfg = {NULL};
828 struct socket *sock0, *sock1u;
831 netdev_dbg(dev, "enable gtp on %d, %d\n", fd_gtp0, fd_gtp1);
833 sock0 = sockfd_lookup(fd_gtp0, &err);
835 netdev_dbg(dev, "socket fd=%d not found (gtp0)\n", fd_gtp0);
839 if (sock0->sk->sk_protocol != IPPROTO_UDP) {
840 netdev_dbg(dev, "socket fd=%d not UDP\n", fd_gtp0);
845 sock1u = sockfd_lookup(fd_gtp1, &err);
846 if (sock1u == NULL) {
847 netdev_dbg(dev, "socket fd=%d not found (gtp1u)\n", fd_gtp1);
852 if (sock1u->sk->sk_protocol != IPPROTO_UDP) {
853 netdev_dbg(dev, "socket fd=%d not UDP\n", fd_gtp1);
858 netdev_dbg(dev, "enable gtp on %p, %p\n", sock0, sock1u);
861 gtp->sock1u = sock1u;
864 tuncfg.sk_user_data = gtp;
865 tuncfg.encap_rcv = gtp_encap_recv;
866 tuncfg.encap_destroy = gtp_encap_destroy;
868 tuncfg.encap_type = UDP_ENCAP_GTP0;
869 setup_udp_tunnel_sock(sock_net(gtp->sock0->sk), gtp->sock0, &tuncfg);
871 tuncfg.encap_type = UDP_ENCAP_GTP1U;
872 setup_udp_tunnel_sock(sock_net(gtp->sock1u->sk), gtp->sock1u, &tuncfg);
882 static struct net_device *gtp_find_dev(struct net *net, int ifindex)
884 struct gtp_net *gn = net_generic(net, gtp_net_id);
887 list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) {
888 if (ifindex == gtp->dev->ifindex)
894 static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info)
896 pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]);
898 pctx->sgsn_addr_ip4.s_addr =
899 nla_get_be32(info->attrs[GTPA_SGSN_ADDRESS]);
900 pctx->ms_addr_ip4.s_addr =
901 nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
903 switch (pctx->gtp_version) {
905 /* According to TS 09.60, sections 7.5.1 and 7.5.2, the flow
906 * label needs to be the same for uplink and downlink packets,
907 * so let's annotate this.
909 pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]);
910 pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]);
913 pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]);
914 pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]);
921 static int ipv4_pdp_add(struct net_device *dev, struct genl_info *info)
923 struct gtp_dev *gtp = netdev_priv(dev);
924 u32 hash_ms, hash_tid = 0;
925 struct pdp_ctx *pctx;
929 ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
930 hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size;
932 hlist_for_each_entry_rcu(pctx, >p->addr_hash[hash_ms], hlist_addr) {
933 if (pctx->ms_addr_ip4.s_addr == ms_addr) {
940 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
942 if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE)
945 ipv4_pdp_fill(pctx, info);
947 if (pctx->gtp_version == GTP_V0)
948 netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n",
949 pctx->u.v0.tid, pctx);
950 else if (pctx->gtp_version == GTP_V1)
951 netdev_dbg(dev, "GTPv1-U: update tunnel id = %x/%x (pdp %p)\n",
952 pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx);
958 pctx = kmalloc(sizeof(struct pdp_ctx), GFP_KERNEL);
962 ipv4_pdp_fill(pctx, info);
963 atomic_set(&pctx->tx_seq, 0);
965 switch (pctx->gtp_version) {
967 /* TS 09.60: "The flow label identifies unambiguously a GTP
968 * flow.". We use the tid for this instead, I cannot find a
969 * situation in which this doesn't unambiguosly identify the
972 hash_tid = gtp0_hashfn(pctx->u.v0.tid) % gtp->hash_size;
975 hash_tid = gtp1u_hashfn(pctx->u.v1.i_tei) % gtp->hash_size;
979 hlist_add_head_rcu(&pctx->hlist_addr, >p->addr_hash[hash_ms]);
980 hlist_add_head_rcu(&pctx->hlist_tid, >p->tid_hash[hash_tid]);
982 switch (pctx->gtp_version) {
984 netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n",
985 pctx->u.v0.tid, &pctx->sgsn_addr_ip4,
986 &pctx->ms_addr_ip4, pctx);
989 netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n",
990 pctx->u.v1.i_tei, pctx->u.v1.o_tei,
991 &pctx->sgsn_addr_ip4, &pctx->ms_addr_ip4, pctx);
998 static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info)
1000 struct net_device *dev;
1003 if (!info->attrs[GTPA_VERSION] ||
1004 !info->attrs[GTPA_LINK] ||
1005 !info->attrs[GTPA_SGSN_ADDRESS] ||
1006 !info->attrs[GTPA_MS_ADDRESS])
1009 switch (nla_get_u32(info->attrs[GTPA_VERSION])) {
1011 if (!info->attrs[GTPA_TID] ||
1012 !info->attrs[GTPA_FLOW])
1016 if (!info->attrs[GTPA_I_TEI] ||
1017 !info->attrs[GTPA_O_TEI])
1025 net = gtp_genl_get_net(sock_net(skb->sk), info->attrs);
1027 return PTR_ERR(net);
1029 /* Check if there's an existing gtpX device to configure */
1030 dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK]));
1037 return ipv4_pdp_add(dev, info);
1040 static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info)
1042 struct net_device *dev;
1043 struct pdp_ctx *pctx;
1044 struct gtp_dev *gtp;
1047 if (!info->attrs[GTPA_VERSION] ||
1048 !info->attrs[GTPA_LINK])
1051 net = gtp_genl_get_net(sock_net(skb->sk), info->attrs);
1053 return PTR_ERR(net);
1055 /* Check if there's an existing gtpX device to configure */
1056 dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK]));
1063 gtp = netdev_priv(dev);
1065 switch (nla_get_u32(info->attrs[GTPA_VERSION])) {
1067 if (!info->attrs[GTPA_TID])
1069 pctx = gtp0_pdp_find(gtp, nla_get_u64(info->attrs[GTPA_TID]));
1072 if (!info->attrs[GTPA_I_TEI])
1074 pctx = gtp1_pdp_find(gtp, nla_get_u64(info->attrs[GTPA_I_TEI]));
1084 if (pctx->gtp_version == GTP_V0)
1085 netdev_dbg(dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n",
1086 pctx->u.v0.tid, pctx);
1087 else if (pctx->gtp_version == GTP_V1)
1088 netdev_dbg(dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n",
1089 pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx);
1091 hlist_del_rcu(&pctx->hlist_tid);
1092 hlist_del_rcu(&pctx->hlist_addr);
1093 kfree_rcu(pctx, rcu_head);
1098 static struct genl_family gtp_genl_family = {
1099 .id = GENL_ID_GENERATE,
1103 .maxattr = GTPA_MAX,
1107 static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq,
1108 u32 type, struct pdp_ctx *pctx)
1112 genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, 0,
1117 if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) ||
1118 nla_put_be32(skb, GTPA_SGSN_ADDRESS, pctx->sgsn_addr_ip4.s_addr) ||
1119 nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr))
1120 goto nla_put_failure;
1122 switch (pctx->gtp_version) {
1124 if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) ||
1125 nla_put_u16(skb, GTPA_FLOW, pctx->u.v0.flow))
1126 goto nla_put_failure;
1129 if (nla_put_u32(skb, GTPA_I_TEI, pctx->u.v1.i_tei) ||
1130 nla_put_u32(skb, GTPA_O_TEI, pctx->u.v1.o_tei))
1131 goto nla_put_failure;
1134 genlmsg_end(skb, genlh);
1139 genlmsg_cancel(skb, genlh);
1143 static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info)
1145 struct pdp_ctx *pctx = NULL;
1146 struct net_device *dev;
1147 struct sk_buff *skb2;
1148 struct gtp_dev *gtp;
1153 if (!info->attrs[GTPA_VERSION] ||
1154 !info->attrs[GTPA_LINK])
1157 gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]);
1158 switch (gtp_version) {
1166 net = gtp_genl_get_net(sock_net(skb->sk), info->attrs);
1168 return PTR_ERR(net);
1170 /* Check if there's an existing gtpX device to configure */
1171 dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK]));
1178 gtp = netdev_priv(dev);
1181 if (gtp_version == GTP_V0 &&
1182 info->attrs[GTPA_TID]) {
1183 u64 tid = nla_get_u64(info->attrs[GTPA_TID]);
1185 pctx = gtp0_pdp_find(gtp, tid);
1186 } else if (gtp_version == GTP_V1 &&
1187 info->attrs[GTPA_I_TEI]) {
1188 u32 tid = nla_get_u32(info->attrs[GTPA_I_TEI]);
1190 pctx = gtp1_pdp_find(gtp, tid);
1191 } else if (info->attrs[GTPA_MS_ADDRESS]) {
1192 __be32 ip = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
1194 pctx = ipv4_pdp_find(gtp, ip);
1202 skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
1208 err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid,
1209 info->snd_seq, info->nlhdr->nlmsg_type, pctx);
1211 goto err_unlock_free;
1214 return genlmsg_unicast(genl_info_net(info), skb2, info->snd_portid);
1223 static int gtp_genl_dump_pdp(struct sk_buff *skb,
1224 struct netlink_callback *cb)
1226 struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp;
1227 struct net *net = sock_net(skb->sk);
1228 struct gtp_net *gn = net_generic(net, gtp_net_id);
1229 unsigned long tid = cb->args[1];
1230 int i, k = cb->args[0], ret;
1231 struct pdp_ctx *pctx;
1236 list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) {
1237 if (last_gtp && last_gtp != gtp)
1242 for (i = k; i < gtp->hash_size; i++) {
1243 hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) {
1244 if (tid && tid != pctx->u.tid)
1249 ret = gtp_genl_fill_info(skb,
1250 NETLINK_CB(cb->skb).portid,
1252 cb->nlh->nlmsg_type, pctx);
1255 cb->args[1] = pctx->u.tid;
1256 cb->args[2] = (unsigned long)gtp;
1267 static struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = {
1268 [GTPA_LINK] = { .type = NLA_U32, },
1269 [GTPA_VERSION] = { .type = NLA_U32, },
1270 [GTPA_TID] = { .type = NLA_U64, },
1271 [GTPA_SGSN_ADDRESS] = { .type = NLA_U32, },
1272 [GTPA_MS_ADDRESS] = { .type = NLA_U32, },
1273 [GTPA_FLOW] = { .type = NLA_U16, },
1274 [GTPA_NET_NS_FD] = { .type = NLA_U32, },
1275 [GTPA_I_TEI] = { .type = NLA_U32, },
1276 [GTPA_O_TEI] = { .type = NLA_U32, },
1279 static const struct genl_ops gtp_genl_ops[] = {
1281 .cmd = GTP_CMD_NEWPDP,
1282 .doit = gtp_genl_new_pdp,
1283 .policy = gtp_genl_policy,
1284 .flags = GENL_ADMIN_PERM,
1287 .cmd = GTP_CMD_DELPDP,
1288 .doit = gtp_genl_del_pdp,
1289 .policy = gtp_genl_policy,
1290 .flags = GENL_ADMIN_PERM,
1293 .cmd = GTP_CMD_GETPDP,
1294 .doit = gtp_genl_get_pdp,
1295 .dumpit = gtp_genl_dump_pdp,
1296 .policy = gtp_genl_policy,
1297 .flags = GENL_ADMIN_PERM,
1301 static int __net_init gtp_net_init(struct net *net)
1303 struct gtp_net *gn = net_generic(net, gtp_net_id);
1305 INIT_LIST_HEAD(&gn->gtp_dev_list);
1309 static void __net_exit gtp_net_exit(struct net *net)
1311 struct gtp_net *gn = net_generic(net, gtp_net_id);
1312 struct gtp_dev *gtp;
1316 list_for_each_entry(gtp, &gn->gtp_dev_list, list)
1317 gtp_dellink(gtp->dev, &list);
1319 unregister_netdevice_many(&list);
1323 static struct pernet_operations gtp_net_ops = {
1324 .init = gtp_net_init,
1325 .exit = gtp_net_exit,
1327 .size = sizeof(struct gtp_net),
1330 static int __init gtp_init(void)
1334 get_random_bytes(>p_h_initval, sizeof(gtp_h_initval));
1336 err = rtnl_link_register(>p_link_ops);
1340 err = genl_register_family_with_ops(>p_genl_family, gtp_genl_ops);
1342 goto unreg_rtnl_link;
1344 err = register_pernet_subsys(>p_net_ops);
1346 goto unreg_genl_family;
1348 pr_info("GTP module loaded (pdp ctx size %Zd bytes)\n",
1349 sizeof(struct pdp_ctx));
1353 genl_unregister_family(>p_genl_family);
1355 rtnl_link_unregister(>p_link_ops);
1357 pr_err("error loading GTP module loaded\n");
1360 late_initcall(gtp_init);
1362 static void __exit gtp_fini(void)
1364 unregister_pernet_subsys(>p_net_ops);
1365 genl_unregister_family(>p_genl_family);
1366 rtnl_link_unregister(>p_link_ops);
1368 pr_info("GTP module unloaded\n");
1370 module_exit(gtp_fini);
1372 MODULE_LICENSE("GPL");
1374 MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic");
1375 MODULE_ALIAS_RTNL_LINK("gtp");