1336 lines
30 KiB
C
1336 lines
30 KiB
C
/* GTP according to GSM TS 09.60 / 3GPP TS 29.060 */
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/* (C) 2012-2014 by sysmocom - s.f.m.c. GmbH
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* Author: Harald Welte <hwelte@sysmocom.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/skbuff.h>
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#include <linux/udp.h>
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#include <linux/rculist.h>
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#include <linux/jhash.h>
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#include <linux/if_tunnel.h>
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#include <linux/net.h>
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#include <linux/file.h>
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#include <net/protocol.h>
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#include <net/ip.h>
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#include <net/udp.h>
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#include <net/icmp.h>
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#include <net/xfrm.h>
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#include <net/genetlink.h>
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#include "gtp.h"
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#include "gtp_nl.h"
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static u32 gtp_h_initval;
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struct pdp_ctx {
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struct hlist_node hlist_tid;
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struct hlist_node hlist_addr;
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u64 tid;
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u8 gtp_version;
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u16 af;
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union {
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struct in6_addr ip6;
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struct in_addr ip4;
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} ms_addr;
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union {
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struct in6_addr ip6;
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struct in_addr ip4;
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} sgsn_addr;
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u16 flow;
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atomic_t tx_seq;
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struct rcu_head rcu_head;
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};
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/* One local instance of the GTP code base */
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struct gtp_instance {
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struct list_head list;
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/* the socket */
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struct socket *sock0;
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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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unsigned int hash_size;
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struct hlist_head *tid_hash;
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struct hlist_head *addr_hash;
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};
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static LIST_HEAD(gtp_instance_list); /* XXX netns */
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static inline u32 gtp0_hashfn(u64 tid)
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{
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u32 *tid32 = (u32 *) &tid;
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return jhash_2words(tid32[0], tid32[1], gtp_h_initval);
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}
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static inline u32 gtp1u_hashfn(u32 tid)
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{
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return jhash_1word(tid, gtp_h_initval);
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}
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static inline u32 ipv4_hashfn(u32 ip)
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{
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return jhash_1word(ip, gtp_h_initval);
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}
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static inline u32 ipv6_hashfn(struct in6_addr *ip6)
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{
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return jhash2((const u32 *) &ip6->s6_addr32, sizeof(*ip6)/sizeof(u32),
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gtp_h_initval);
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}
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/* resolve a PDP context structure based on the 64bit TID */
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static struct pdp_ctx *gtp0_pdp_find(struct gtp_instance *gti, u64 tid)
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{
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struct hlist_head *head;
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struct pdp_ctx *pdp;
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head = >i->tid_hash[gtp0_hashfn(tid) % gti->hash_size];
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hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
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if (pdp->gtp_version == GTP_V0 && pdp->tid == tid)
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return pdp;
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}
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return NULL;
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}
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/* resolve a PDP context structure based on the 32bit TEI */
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static struct pdp_ctx *gtp1_pdp_find(struct gtp_instance *gti, u32 tid)
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{
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struct hlist_head *head;
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struct pdp_ctx *pdp;
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head = >i->tid_hash[gtp1u_hashfn(tid) % gti->hash_size];
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hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
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if (pdp->gtp_version == GTP_V1 && pdp->tid == tid)
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return pdp;
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}
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return NULL;
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}
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/* resolve a PDP context based on IPv4 address of MS */
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static struct pdp_ctx *ipv4_pdp_find(struct gtp_instance *gti,
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u32 ms_addr)
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{
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struct hlist_head *head;
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struct pdp_ctx *pdp;
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head = >i->addr_hash[ipv4_hashfn(ms_addr) % gti->hash_size];
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hlist_for_each_entry_rcu(pdp, head, hlist_addr) {
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if (pdp->af == AF_INET && pdp->ms_addr.ip4.s_addr == ms_addr)
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return pdp;
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}
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return NULL;
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}
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/* resolve a PDP context based on IPv6 address of MS */
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static struct pdp_ctx *ipv6_pdp_find(struct gtp_instance *gti,
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struct in6_addr *ms_addr)
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{
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struct hlist_head *head;
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struct pdp_ctx *pdp;
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head = >i->addr_hash[ipv6_hashfn(ms_addr) % gti->hash_size];
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hlist_for_each_entry_rcu(pdp, head, hlist_addr) {
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if (pdp->af == AF_INET6 &&
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!memcmp(&pdp->ms_addr.ip6, ms_addr, sizeof(*ms_addr)))
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return pdp;
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}
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return NULL;
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}
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/* resolve the GTP instance for a given sock */
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static inline struct gtp_instance *sk_to_gti(struct sock *sk)
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{
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struct gtp_instance *gti;
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if (!sk)
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return NULL;
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sock_hold(sk);
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gti = (struct gtp_instance *) sk->sk_user_data;
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if (!gti) {
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sock_put(sk);
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return NULL;
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}
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return gti;
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}
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/* Check if the inner IP header has the source address assigned to the
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* current MS.
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*/
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static bool gtp_check_src_ms(struct sk_buff *skb, struct pdp_ctx *pctx,
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unsigned int hdrlen)
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{
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bool ret = false;
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if (skb->protocol == ntohs(ETH_P_IP)) {
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struct iphdr *iph;
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if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr)))
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return false;
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iph = (struct iphdr *)
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(skb->data + hdrlen + sizeof(struct iphdr));
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ret = (iph->saddr != pctx->ms_addr.ip4.s_addr);
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} else if (skb->protocol == ntohs(ETH_P_IPV6)) {
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struct ipv6hdr *ip6h;
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if (!pskb_may_pull(skb, hdrlen + sizeof(struct ipv6hdr)))
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return false;
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ip6h = (struct ipv6hdr *)
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(skb->data + hdrlen + sizeof(struct ipv6hdr));
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ret = memcmp(&ip6h->saddr, &pctx->ms_addr.ip6,
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sizeof(struct in6_addr)) == 0;
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}
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return ret;
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}
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/* 1 means pass up to the stack, -1 means drop and 0 means decapsulated */
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static int gtp0_udp_encap_recv(struct gtp_instance *gti, struct sk_buff *skb)
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{
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struct gtp0_header *gtp0;
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struct pdp_ctx *pctx;
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unsigned int hdrlen = sizeof(struct udphdr) + sizeof(*gtp0);
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int ret = 0;
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/* check for sufficient header size */
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if (!pskb_may_pull(skb, hdrlen))
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return -1;
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gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));
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/* check for GTP Version 0 */
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if ((gtp0->flags >> 5) != GTP_V0)
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return 1;
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/* check if it is T-PDU. if not -> userspace */
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if (gtp0->type != GTP_TPDU)
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return 1;
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rcu_read_lock();
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/* look-up the PDP context for the Tunnel ID */
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pctx = gtp0_pdp_find(gti, be64_to_cpu(gtp0->tid));
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if (!pctx) {
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ret = -1;
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goto out_rcu;
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}
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if (!gtp_check_src_ms(skb, pctx, hdrlen)) {
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ret = -1;
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goto out_rcu;
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}
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/* get rid of the GTP + UDP headers */
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__skb_pull(skb, hdrlen);
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out_rcu:
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rcu_read_unlock();
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return ret;
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}
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static int gtp1u_udp_encap_recv(struct gtp_instance *gti, struct sk_buff *skb)
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{
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struct gtp1_header *gtp1;
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struct pdp_ctx *pctx;
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unsigned int hdrlen = sizeof(struct udphdr) + sizeof(*gtp1);
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int ret = 0;
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/* check for sufficient header size */
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if (!pskb_may_pull(skb, hdrlen))
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return -1;
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gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
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/* check for GTP Version 1 */
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if ((gtp1->flags >> 5) != GTP_V1)
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return 1;
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/* check if it is T-PDU. */
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if (gtp1->type != GTP_TPDU)
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return 1;
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/* From 29.060: "This field shall be present if and only if any one or
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* more of the S, PN and E flags are set.".
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*
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* If any of the bit is set, then the remaining ones also have to be
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* set.
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*/
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if (gtp1->flags & GTP1_F_MASK)
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hdrlen += 4;
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/* check for sufficient header size for extension */
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if (!pskb_may_pull(skb, hdrlen))
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return -1;
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/* look-up the PDP context for the Tunnel ID */
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rcu_read_lock();
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pctx = gtp1_pdp_find(gti, ntohl(gtp1->tid));
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if (!pctx) {
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ret = -1;
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goto out_rcu;
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}
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if (!gtp_check_src_ms(skb, pctx, hdrlen)) {
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ret = -1;
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goto out_rcu;
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}
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/* get rid of the UDP + GTP header + extensions */
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__skb_pull(skb, hdrlen);
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out_rcu:
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rcu_read_unlock();
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return ret;
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}
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/* UDP encapsulation receive handler. See net/ipv4/udp.c.
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* Return codes: 0: success, <0: error, >0: passed up to userspace UDP.
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*/
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static int gtp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
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{
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struct gtp_instance *gti;
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int ret;
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/* resolve the GTP instance to which the socket belongs */
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gti = sk_to_gti(sk);
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if (!gti)
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goto user;
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switch (udp_sk(sk)->encap_type) {
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case UDP_ENCAP_GTP0:
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netdev_dbg(gti->dev, "received GTP0 packet\n");
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ret = gtp0_udp_encap_recv(gti, skb);
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break;
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case UDP_ENCAP_GTP1U:
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netdev_dbg(gti->dev, "received GTP1U packet\n");
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ret = gtp1u_udp_encap_recv(gti, skb);
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break;
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default:
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ret = -1; /* shouldn't happen */
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}
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switch (ret) {
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case 1:
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netdev_dbg(gti->dev, "pass up to the process\n");
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goto user_put;
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case 0:
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netdev_dbg(gti->dev, "forwarding packet from GGSN to uplink\n");
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break;
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case -1:
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netdev_dbg(gti->dev, "GTP packet has been dropped\n");
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goto drop;
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}
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/* Now that the UDP and the GTP header have been removed, set up the
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* new network header. This is required by the upper later to
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* calculate the transport header.
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*/
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skb_reset_network_header(skb);
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/* re-submit via virtual tunnel device into regular network stack */
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secpath_reset(skb);
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skb_dst_drop(skb);
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nf_reset(skb);
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skb->dev = gti->dev;
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/* Force the upper layers to verify it. */
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skb->ip_summed = CHECKSUM_NONE;
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netif_rx(skb);
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sock_put(sk);
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return 0;
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drop:
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kfree_skb(skb);
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return 0;
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user_put:
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sock_put(sk);
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user:
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return 1;
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}
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static int gtp_dev_init(struct net_device *dev)
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{
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struct gtp_instance *gti = netdev_priv(dev);
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dev->flags = IFF_NOARP;
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gti->dev = dev;
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dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
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if (!dev->tstats)
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return -ENOMEM;
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return 0;
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}
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static void gtp_encap_disable(struct gtp_instance *gti);
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static void gtp_dev_uninit(struct net_device *dev)
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{
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struct gtp_instance *gti = netdev_priv(dev);
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gtp_encap_disable(gti);
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free_percpu(dev->tstats);
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}
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#define IP_UDP_LEN (sizeof(struct iphdr) + sizeof(struct udphdr))
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static struct rtable *
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ip4_route_output_gtp(struct net *net, struct flowi4 *fl4,
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__be32 daddr, __be32 saddr, __u8 tos, int oif)
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{
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memset(fl4, 0, sizeof(*fl4));
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fl4->flowi4_oif = oif;
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fl4->daddr = daddr;
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fl4->saddr = saddr;
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fl4->flowi4_tos = tos;
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fl4->flowi4_proto = IPPROTO_UDP;
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return ip_route_output_key(net, fl4);
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}
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static inline void
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gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx, int payload_len)
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{
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struct gtp0_header *gtp0;
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/* ensure there is sufficient headroom */
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skb_cow(skb, sizeof(*gtp0) + IP_UDP_LEN);
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gtp0 = (struct gtp0_header *) skb_push(skb, sizeof(*gtp0));
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gtp0->flags = 0x1e; /* V0, GTP-non-prime */
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gtp0->type = GTP_TPDU;
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gtp0->length = htons(payload_len);
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gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq)-1) % 0xffff);
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gtp0->flow = htonl(pctx->flow);
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gtp0->number = 0xFF;
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gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xFF;
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gtp0->tid = cpu_to_be64(pctx->tid);
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}
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static inline void
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gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx, int payload_len)
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{
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struct gtp1_header *gtp1;
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/* ensure there is sufficient headroom */
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skb_cow(skb, sizeof(*gtp1) + IP_UDP_LEN);
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gtp1 = (struct gtp1_header *) skb_push(skb, sizeof(*gtp1));
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/* Bits 8 7 6 5 4 3 2 1
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* +--+--+--+--+--+--+--+--+
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* |version |PT| 1| E| S|PN|
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* +--+--+--+--+--+--+--+--+
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* 0 0 1 1 1 0 0 0
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*/
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gtp1->flags = 0x38; /* V1, GTP-non-prime */
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gtp1->type = GTP_TPDU;
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gtp1->length = htons(payload_len);
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gtp1->tid = htonl((u32)pctx->tid);
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/* TODO: Suppport for extension header, sequence number and N-PDU.
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* Update the length field if any of them is available.
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*/
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}
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/* From Linux kernel 3.13: iptunnel_xmit_stats() */
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static inline void
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gtp_iptunnel_xmit_stats(int err, struct net_device_stats *err_stats,
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struct pcpu_sw_netstats __percpu *stats)
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{
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if (err > 0) {
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struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
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u64_stats_update_begin(&tstats->syncp);
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tstats->tx_bytes += err;
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tstats->tx_packets++;
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u64_stats_update_end(&tstats->syncp);
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} else if (err < 0) {
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err_stats->tx_errors++;
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err_stats->tx_aborted_errors++;
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} else {
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err_stats->tx_dropped++;
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}
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}
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struct gtp_pktinfo {
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union {
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struct iphdr *iph;
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struct ipv6hdr *ip6h;
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};
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union {
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struct flowi4 fl4;
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};
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struct rtable *rt;
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struct pdp_ctx *pctx;
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struct net_device *dev;
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};
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static inline void
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gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo, struct iphdr *iph,
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struct pdp_ctx *pctx, struct rtable *rt,
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struct flowi4 *fl4, struct net_device *dev)
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{
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pktinfo->iph = iph;
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pktinfo->pctx = pctx;
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pktinfo->rt = rt;
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pktinfo->fl4 = *fl4;
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pktinfo->dev = dev;
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}
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static int gtp_ip4_prepare_xmit(struct sk_buff *skb, struct net_device *dev,
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struct gtp_pktinfo *pktinfo)
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{
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struct gtp_instance *gti = netdev_priv(dev);
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struct inet_sock *inet = inet_sk(gti->sock0->sk);
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struct iphdr *iph;
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struct pdp_ctx *pctx;
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struct rtable *rt;
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struct flowi4 fl4;
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int df, mtu;
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|
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/* Read the IP destination address and resolve the PDP context.
|
|
* Prepend PDP header with TEI/TID from PDP ctx.
|
|
*/
|
|
iph = ip_hdr(skb);
|
|
pctx = ipv4_pdp_find(gti, iph->daddr);
|
|
if (!pctx) {
|
|
netdev_dbg(dev, "no PDP ctx found for this packet, skip\n");
|
|
return -ENOENT;
|
|
}
|
|
netdev_dbg(dev, "found PDP context %p\n", pctx);
|
|
|
|
/* Obtain route for the new encapsulated GTP packet */
|
|
rt = ip4_route_output_gtp(dev_net(dev), &fl4,
|
|
pctx->sgsn_addr.ip4.s_addr,
|
|
inet->inet_saddr, 0,
|
|
gti->real_dev->ifindex);
|
|
if (IS_ERR(rt)) {
|
|
netdev_dbg(dev, "no route to SSGN %pI4 from ifidx=%d\n",
|
|
&pctx->sgsn_addr.ip4.s_addr,
|
|
gti->real_dev->ifindex);
|
|
dev->stats.tx_carrier_errors++;
|
|
goto err;
|
|
}
|
|
|
|
/* There is a routing loop */
|
|
if (rt->dst.dev == dev) {
|
|
netdev_dbg(dev, "circular route to SSGN %pI4\n",
|
|
&pctx->sgsn_addr.ip4.s_addr);
|
|
dev->stats.collisions++;
|
|
goto err_rt;
|
|
}
|
|
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, &rt->dst);
|
|
|
|
/* This is similar to tnl_update_pmtu() */
|
|
df = iph->frag_off;
|
|
if (df) {
|
|
mtu = dst_mtu(&rt->dst) - gti->real_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 = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
|
|
|
|
if (skb_dst(skb))
|
|
skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
|
|
|
|
if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) &&
|
|
mtu < ntohs(iph->tot_len)) {
|
|
netdev_dbg(dev, "packet too big, fragmentation needed\n");
|
|
memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
|
|
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
|
|
htonl(mtu));
|
|
goto err_rt;
|
|
}
|
|
|
|
gtp_set_pktinfo_ipv4(pktinfo, iph, pctx, rt, &fl4, dev);
|
|
|
|
return 0;
|
|
err_rt:
|
|
ip_rt_put(rt);
|
|
err:
|
|
return -EBADMSG;
|
|
}
|
|
|
|
static int gtp_ip6_prepare_xmit(struct sk_buff *skb, struct net_device *dev,
|
|
struct gtp_pktinfo *pktinfo)
|
|
{
|
|
/* TODO IPV6 support */
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
gtp_push_ip4hdr(struct sk_buff *skb, struct gtp_pktinfo *pktinfo)
|
|
{
|
|
struct iphdr *iph;
|
|
|
|
/* Push down and install the IP header. Similar to iptunnel_xmit() */
|
|
skb_push(skb, sizeof(struct iphdr));
|
|
skb_reset_network_header(skb);
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
iph->version = 4;
|
|
iph->ihl = sizeof(struct iphdr) >> 2;
|
|
iph->frag_off = htons(IP_DF);
|
|
iph->protocol = IPPROTO_UDP;
|
|
iph->tos = pktinfo->iph->tos;
|
|
iph->daddr = pktinfo->fl4.daddr;
|
|
iph->saddr = pktinfo->fl4.saddr;
|
|
iph->ttl = ip4_dst_hoplimit(&pktinfo->rt->dst);
|
|
__ip_select_ident(iph, &pktinfo->rt->dst,
|
|
(skb_shinfo(skb)->gso_segs ?: 1) - 1);
|
|
|
|
netdev_dbg(pktinfo->dev, "gtp -> IP src: %pI4 dst: %pI4\n",
|
|
&iph->saddr, &iph->daddr);
|
|
}
|
|
|
|
static inline void
|
|
gtp_push_ip6hdr(struct sk_buff *skb, struct gtp_pktinfo *pktinfo)
|
|
{
|
|
/* TODO IPV6 support */
|
|
}
|
|
|
|
static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct udphdr *uh;
|
|
unsigned int payload_len;
|
|
struct gtp_pktinfo pktinfo;
|
|
unsigned int proto = ntohs(skb->protocol);
|
|
int gtph_len, err;
|
|
|
|
rcu_read_lock();
|
|
switch (proto) {
|
|
case ETH_P_IP:
|
|
err = gtp_ip4_prepare_xmit(skb, dev, &pktinfo);
|
|
break;
|
|
case ETH_P_IPV6:
|
|
err = gtp_ip6_prepare_xmit(skb, dev, &pktinfo);
|
|
break;
|
|
}
|
|
|
|
if (err < 0)
|
|
goto tx_error;
|
|
|
|
/* Annotate length of the encapsulated packet */
|
|
payload_len = skb->len;
|
|
|
|
/* Push down GTP header */
|
|
switch (pktinfo.pctx->gtp_version) {
|
|
case GTP_V0:
|
|
gtp0_push_header(skb, pktinfo.pctx, payload_len);
|
|
break;
|
|
case GTP_V1:
|
|
gtp1_push_header(skb, pktinfo.pctx, payload_len);
|
|
break;
|
|
}
|
|
|
|
/* Push down and install the UDP header. */
|
|
skb_push(skb, sizeof(struct udphdr));
|
|
skb_reset_transport_header(skb);
|
|
|
|
uh = udp_hdr(skb);
|
|
switch (pktinfo.pctx->gtp_version) {
|
|
case GTP_V0:
|
|
uh->source = uh->dest = htons(GTP0_PORT);
|
|
gtph_len = sizeof(struct gtp0_header);
|
|
break;
|
|
case GTP_V1:
|
|
uh->source = uh->dest = htons(GTP1U_PORT);
|
|
gtph_len = sizeof(struct gtp1_header);
|
|
break;
|
|
}
|
|
|
|
uh->len = htons(sizeof(struct udphdr) + payload_len + gtph_len);
|
|
uh->check = 0;
|
|
|
|
netdev_dbg(dev, "gtp -> UDP src: %u dst: %u (len %u)\n",
|
|
ntohs(uh->source), ntohs(uh->dest), ntohs(uh->len));
|
|
|
|
switch (proto) {
|
|
case ETH_P_IP:
|
|
gtp_push_ip4hdr(skb, &pktinfo);
|
|
break;
|
|
case ETH_P_IPV6:
|
|
gtp_push_ip6hdr(skb, &pktinfo);
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
nf_reset(skb);
|
|
|
|
netdev_dbg(dev, "Good, now packet leaving from GGSN to SGSN\n");
|
|
|
|
err = ip_local_out(skb);
|
|
gtp_iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
|
|
|
|
return NETDEV_TX_OK;
|
|
tx_error:
|
|
rcu_read_unlock();
|
|
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,
|
|
};
|
|
|
|
static void gtp_link_setup(struct net_device *dev)
|
|
{
|
|
dev->netdev_ops = >p_netdev_ops;
|
|
dev->destructor = free_netdev;
|
|
}
|
|
|
|
static int gtp_hashtable_new(struct gtp_instance *gti, int hsize);
|
|
static void gtp_hashtable_free(struct gtp_instance *gti);
|
|
static int gtp_encap_enable(struct net_device *dev, struct gtp_instance *gti,
|
|
int fd_gtp0, int fd_gtp1);
|
|
|
|
static int gtp_newlink(struct net *src_net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
struct net_device *real_dev;
|
|
struct gtp_instance *gti;
|
|
int hashsize, err, fd0, fd1;
|
|
|
|
if (!tb[IFLA_LINK])
|
|
return -EINVAL;
|
|
|
|
real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
|
|
if (!real_dev)
|
|
return -ENODEV;
|
|
|
|
dev_hold(real_dev);
|
|
|
|
if (!tb[IFLA_MTU])
|
|
dev->mtu = real_dev->mtu;
|
|
else if (dev->mtu > real_dev->mtu)
|
|
return -EINVAL;
|
|
|
|
gti = netdev_priv(dev);
|
|
gti->real_dev = real_dev;
|
|
|
|
fd0 = nla_get_u32(data[IFLA_GTP_FD0]);
|
|
fd1 = nla_get_u32(data[IFLA_GTP_FD1]);
|
|
|
|
gtp_encap_enable(dev, gti, fd0, fd1);
|
|
|
|
if (!data[IFLA_GTP_HASHSIZE])
|
|
hashsize = 1024;
|
|
else
|
|
hashsize = nla_get_u32(data[IFLA_GTP_HASHSIZE]);
|
|
|
|
err = gtp_hashtable_new(gti, hashsize);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = register_netdevice(dev);
|
|
if (err < 0)
|
|
goto err1;
|
|
|
|
list_add_rcu(>i->list, >p_instance_list);
|
|
|
|
netdev_dbg(dev, "registered new interface\n");
|
|
|
|
return 0;
|
|
err1:
|
|
netdev_dbg(dev, "failed to register new netdev %d\n", err);
|
|
gtp_hashtable_free(gti);
|
|
return err;
|
|
}
|
|
|
|
static void gtp_dellink(struct net_device *dev, struct list_head *head)
|
|
{
|
|
struct gtp_instance *gti = netdev_priv(dev);
|
|
|
|
gtp_encap_disable(gti);
|
|
gtp_hashtable_free(gti);
|
|
dev_put(gti->real_dev);
|
|
list_del_rcu(>i->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_HASHSIZE] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int gtp_validate(struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
if (!data || !data[IFLA_GTP_FD0] || !data[IFLA_GTP_FD1])
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static size_t gtp_get_size(const struct net_device *dev)
|
|
{
|
|
return nla_total_size(sizeof(__u32)); /* IFLA_GTP_HASHSIZE */
|
|
}
|
|
|
|
static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev)
|
|
{
|
|
struct gtp_instance *gti = netdev_priv(dev);
|
|
|
|
if (nla_put_u32(skb, IFLA_GTP_HASHSIZE, gti->hash_size))
|
|
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_instance),
|
|
.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_instance *gti, int hsize)
|
|
{
|
|
int i;
|
|
|
|
gti->addr_hash = kmalloc(sizeof(struct hlist_head) * hsize, GFP_KERNEL);
|
|
if (gti->addr_hash == NULL)
|
|
return -ENOMEM;
|
|
|
|
gti->tid_hash= kmalloc(sizeof(struct hlist_head) * hsize, GFP_KERNEL);
|
|
if (gti->tid_hash == NULL)
|
|
goto err1;
|
|
|
|
gti->hash_size = hsize;
|
|
|
|
for (i = 0; i < hsize; i++) {
|
|
INIT_HLIST_HEAD(>i->addr_hash[i]);
|
|
INIT_HLIST_HEAD(>i->tid_hash[i]);
|
|
}
|
|
return 0;
|
|
err1:
|
|
kfree(gti->addr_hash);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void gtp_hashtable_free(struct gtp_instance *gti)
|
|
{
|
|
struct pdp_ctx *pctx;
|
|
int i;
|
|
|
|
for (i = 0; i < gti->hash_size; i++) {
|
|
hlist_for_each_entry_rcu(pctx, >i->tid_hash[i], hlist_tid) {
|
|
hlist_del_rcu(&pctx->hlist_tid);
|
|
hlist_del_rcu(&pctx->hlist_addr);
|
|
kfree_rcu(pctx, rcu_head);
|
|
}
|
|
}
|
|
synchronize_rcu();
|
|
kfree(gti->addr_hash);
|
|
kfree(gti->tid_hash);
|
|
}
|
|
|
|
static int gtp_encap_enable(struct net_device *dev, struct gtp_instance *gti,
|
|
int fd_gtp0, int fd_gtp1)
|
|
{
|
|
int err;
|
|
struct socket *sock0, *sock1u;
|
|
struct sock *sk;
|
|
|
|
sock0 = sockfd_lookup(fd_gtp0, &err);
|
|
if (sock0 == NULL) {
|
|
netdev_dbg(dev, "socket fd=%d not found (gtp0)\n", fd_gtp0);
|
|
return -ENOENT;
|
|
}
|
|
|
|
if (sock0->sk->sk_protocol != IPPROTO_UDP) {
|
|
netdev_dbg(dev, "socket fd=%d not UDP\n", fd_gtp0);
|
|
err = -EINVAL;
|
|
goto err1;
|
|
}
|
|
|
|
sock1u = sockfd_lookup(fd_gtp1, &err);
|
|
if (sock1u == NULL) {
|
|
netdev_dbg(dev, "socket fd=%d not found (gtp1u)\n", fd_gtp1);
|
|
err = -ENOENT;
|
|
goto err1;
|
|
}
|
|
|
|
if (sock1u->sk->sk_protocol != IPPROTO_UDP) {
|
|
netdev_dbg(dev, "socket fd=%d not UDP\n", fd_gtp1);
|
|
err = -EINVAL;
|
|
goto err2;
|
|
}
|
|
|
|
gti->sock0 = sock0;
|
|
gti->sock1u = sock1u;
|
|
|
|
sk = gti->sock0->sk;
|
|
udp_sk(sk)->encap_type = UDP_ENCAP_GTP0;
|
|
udp_sk(sk)->encap_rcv = gtp_udp_encap_recv;
|
|
sk->sk_user_data = gti;
|
|
udp_encap_enable();
|
|
|
|
sk = gti->sock1u->sk;
|
|
udp_sk(sk)->encap_type = UDP_ENCAP_GTP1U;
|
|
udp_sk(sk)->encap_rcv = gtp_udp_encap_recv;
|
|
sk->sk_user_data = gti;
|
|
|
|
return 0;
|
|
err1:
|
|
sockfd_put(sock0);
|
|
err2:
|
|
sockfd_put(sock1u);
|
|
return err;
|
|
}
|
|
|
|
static void gtp_encap_disable(struct gtp_instance *gti)
|
|
{
|
|
if (gti->sock1u)
|
|
sockfd_put(gti->sock1u);
|
|
if (gti->sock0)
|
|
sockfd_put(gti->sock0);
|
|
}
|
|
|
|
static struct net_device *gtp_find_dev(int ifindex)
|
|
{
|
|
struct gtp_instance *gti;
|
|
|
|
list_for_each_entry_rcu(gti, >p_instance_list, list) {
|
|
if (ifindex == gti->dev->ifindex)
|
|
return gti->dev;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int ipv4_pdp_add(struct net_device *dev, struct genl_info *info)
|
|
{
|
|
struct gtp_instance *gti = netdev_priv(dev);
|
|
u32 hash_ms;
|
|
u32 hash_tid;
|
|
struct pdp_ctx *pctx;
|
|
u32 gtp_version, link, sgsn_addr, ms_addr, tid;
|
|
bool found = false;
|
|
|
|
gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]);
|
|
switch (gtp_version) {
|
|
case GTP_V0:
|
|
case GTP_V1:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
tid = nla_get_u64(info->attrs[GTPA_TID]);
|
|
/* GTPv1 allows 32-bits tunnel IDs */
|
|
if (gtp_version == GTP_V1 && tid > UINT_MAX)
|
|
return -EINVAL;
|
|
|
|
link = nla_get_u32(info->attrs[GTPA_LINK]);
|
|
sgsn_addr = nla_get_u32(info->attrs[GTPA_SGSN_ADDRESS]);
|
|
ms_addr = nla_get_u32(info->attrs[GTPA_MS_ADDRESS]);
|
|
|
|
hash_ms = ipv4_hashfn(ms_addr) % gti->hash_size;
|
|
|
|
hlist_for_each_entry_rcu(pctx, >i->addr_hash[hash_ms], hlist_addr) {
|
|
if (pctx->ms_addr.ip4.s_addr == ms_addr) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (found) {
|
|
if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
|
|
return -EEXIST;
|
|
if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE)
|
|
return -EOPNOTSUPP;
|
|
|
|
pctx->af = AF_INET;
|
|
pctx->gtp_version = gtp_version;
|
|
pctx->tid = tid;
|
|
pctx->sgsn_addr.ip4.s_addr = sgsn_addr;
|
|
pctx->ms_addr.ip4.s_addr = ms_addr;
|
|
|
|
netdev_dbg(dev, "update tunnel id = %u (pdp %p)\n",
|
|
tid, pctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
pctx = kmalloc(sizeof(struct pdp_ctx), GFP_KERNEL);
|
|
if (pctx == NULL)
|
|
return -ENOMEM;
|
|
|
|
pctx->af = AF_INET;
|
|
pctx->gtp_version = gtp_version;
|
|
pctx->tid = tid;
|
|
pctx->sgsn_addr.ip4.s_addr = sgsn_addr;
|
|
pctx->ms_addr.ip4.s_addr = ms_addr;
|
|
atomic_set(&pctx->tx_seq, 0);
|
|
|
|
hash_tid = ipv4_hashfn(tid) % gti->hash_size;
|
|
|
|
hlist_add_head_rcu(&pctx->hlist_addr, >i->addr_hash[hash_ms]);
|
|
hlist_add_head_rcu(&pctx->hlist_tid, >i->tid_hash[hash_tid]);
|
|
|
|
netdev_dbg(dev, "adding tunnel id = %u (pdp %p)\n", tid, pctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gtp_genl_tunnel_new(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
if (!info->attrs[GTPA_VERSION] ||
|
|
!info->attrs[GTPA_LINK] ||
|
|
!info->attrs[GTPA_SGSN_ADDRESS] ||
|
|
!info->attrs[GTPA_MS_ADDRESS] ||
|
|
!info->attrs[GTPA_TID])
|
|
return -EINVAL;
|
|
|
|
/* 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 -ENODEV;
|
|
|
|
return ipv4_pdp_add(dev, info);
|
|
}
|
|
|
|
static int gtp_genl_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct gtp_instance *gti;
|
|
struct net_device *dev;
|
|
struct pdp_ctx *pctx;
|
|
u32 gtp_version;
|
|
u64 tid;
|
|
|
|
if (!info->attrs[GTPA_VERSION] ||
|
|
!info->attrs[GTPA_LINK] ||
|
|
!info->attrs[GTPA_SGSN_ADDRESS] ||
|
|
!info->attrs[GTPA_MS_ADDRESS] ||
|
|
!info->attrs[GTPA_TID])
|
|
return -EINVAL;
|
|
|
|
gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]);
|
|
switch (gtp_version) {
|
|
case GTP_V0:
|
|
case GTP_V1:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
tid = nla_get_u64(info->attrs[GTPA_TID]);
|
|
/* GTPv1 allows 32-bits tunnel IDs */
|
|
if (gtp_version == GTP_V1 && tid > UINT_MAX)
|
|
return -EINVAL;
|
|
|
|
/* 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 -ENODEV;
|
|
|
|
gti = netdev_priv(dev);
|
|
|
|
switch (gtp_version) {
|
|
case GTP_V0:
|
|
pctx = gtp0_pdp_find(gti, nla_get_u64(info->attrs[GTPA_TID]));
|
|
break;
|
|
case GTP_V1:
|
|
pctx = gtp1_pdp_find(gti, nla_get_u64(info->attrs[GTPA_TID]));
|
|
break;
|
|
}
|
|
|
|
if (pctx == NULL)
|
|
return -ENOENT;
|
|
|
|
netdev_dbg(dev, "deleting tunnel with ID %lld\n",
|
|
(unsigned long long) nla_get_u64(info->attrs[GTPA_TID]));
|
|
|
|
hlist_del_rcu(&pctx->hlist_tid);
|
|
hlist_del_rcu(&pctx->hlist_addr);
|
|
kfree_rcu(pctx, rcu_head);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct genl_family gtp_genl_family = {
|
|
.id = GENL_ID_GENERATE,
|
|
.name = "gtp",
|
|
.version = 0,
|
|
.hdrsize = 0,
|
|
.maxattr = GTPA_MAX,
|
|
.netnsok = true,
|
|
};
|
|
|
|
static int
|
|
gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq,
|
|
u32 type, struct pdp_ctx *pctx)
|
|
{
|
|
void *genlh;
|
|
|
|
genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, 0,
|
|
type);
|
|
if (genlh == NULL)
|
|
goto nlmsg_failure;
|
|
|
|
if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) ||
|
|
nla_put_u32(skb, GTPA_SGSN_ADDRESS, pctx->sgsn_addr.ip4.s_addr) ||
|
|
nla_put_u32(skb, GTPA_MS_ADDRESS, pctx->ms_addr.ip4.s_addr) ||
|
|
nla_put_u64(skb, GTPA_TID, pctx->tid))
|
|
goto nla_put_failure;
|
|
|
|
return genlmsg_end(skb, genlh);
|
|
|
|
nlmsg_failure:
|
|
nla_put_failure:
|
|
genlmsg_cancel(skb, genlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int gtp_genl_tunnel_get(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net_device *dev;
|
|
struct gtp_instance *gti;
|
|
struct pdp_ctx *pctx = NULL;
|
|
struct sk_buff *skb2;
|
|
u32 gtp_version;
|
|
int err;
|
|
|
|
if (!info->attrs[GTPA_VERSION] ||
|
|
!info->attrs[GTPA_LINK])
|
|
return -EINVAL;
|
|
|
|
gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]);
|
|
switch (gtp_version) {
|
|
case GTP_V0:
|
|
case GTP_V1:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* 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 -ENODEV;
|
|
|
|
gti = netdev_priv(dev);
|
|
|
|
rcu_read_lock();
|
|
if (info->attrs[GTPA_TID]) {
|
|
u64 tid = nla_get_u64(info->attrs[GTPA_TID]);
|
|
|
|
/* GTPv1 allows 32-bits tunnel IDs */
|
|
if (gtp_version == GTP_V1 && tid > UINT_MAX) {
|
|
err = -EINVAL;
|
|
goto err_unlock;
|
|
}
|
|
|
|
switch (gtp_version) {
|
|
case GTP_V0:
|
|
pctx = gtp0_pdp_find(gti, tid);
|
|
break;
|
|
case GTP_V1:
|
|
pctx = gtp1_pdp_find(gti, tid);
|
|
break;
|
|
}
|
|
} else if (info->attrs[GTPA_MS_ADDRESS]) {
|
|
u32 ip = nla_get_u32(info->attrs[GTPA_MS_ADDRESS]);
|
|
|
|
pctx = ipv4_pdp_find(gti, ip);
|
|
}
|
|
|
|
if (pctx == NULL) {
|
|
err = -ENOENT;
|
|
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, 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_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int i, k = cb->args[0], ret;
|
|
unsigned long tid = cb->args[1];
|
|
struct gtp_instance *last_gti = (struct gtp_instance *)cb->args[2], *gti;
|
|
struct pdp_ctx *pctx;
|
|
|
|
if (cb->args[4])
|
|
return 0;
|
|
|
|
list_for_each_entry_rcu(gti, >p_instance_list, list) {
|
|
if (last_gti && last_gti != gti)
|
|
continue;
|
|
else
|
|
last_gti = NULL;
|
|
|
|
for (i = k; i < gti->hash_size; i++) {
|
|
hlist_for_each_entry_rcu(pctx, >i->tid_hash[i], hlist_tid) {
|
|
if (tid && tid != pctx->tid)
|
|
continue;
|
|
else
|
|
tid = 0;
|
|
|
|
ret = gtp_genl_fill_info(skb,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
cb->nlh->nlmsg_type, pctx);
|
|
if (ret < 0) {
|
|
cb->args[0] = i;
|
|
cb->args[1] = pctx->tid;
|
|
cb->args[2] = (unsigned long)gti;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
cb->args[4] = 1;
|
|
out:
|
|
return skb->len;
|
|
}
|
|
|
|
static struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = {
|
|
[GTPA_VERSION] = { .type = NLA_U32, },
|
|
[GTPA_LINK] = { .type = NLA_U32, },
|
|
[GTPA_SGSN_ADDRESS] = { .type = NLA_NESTED, },
|
|
[GTPA_MS_ADDRESS] = { .type = NLA_NESTED, },
|
|
};
|
|
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 13, 0)
|
|
static const struct genl_ops gtp_genl_ops[] = {
|
|
#else
|
|
static struct genl_ops gtp_genl_ops[] = {
|
|
#endif
|
|
{
|
|
.cmd = GTP_CMD_TUNNEL_NEW,
|
|
.doit = gtp_genl_tunnel_new,
|
|
.policy = gtp_genl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = GTP_CMD_TUNNEL_DELETE,
|
|
.doit = gtp_genl_tunnel_delete,
|
|
.policy = gtp_genl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = GTP_CMD_TUNNEL_GET,
|
|
.doit = gtp_genl_tunnel_get,
|
|
.dumpit = gtp_genl_tunnel_dump,
|
|
.policy = gtp_genl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
};
|
|
|
|
static int __init gtp_init(void)
|
|
{
|
|
int err;
|
|
|
|
get_random_bytes(>p_h_initval, sizeof(gtp_h_initval));
|
|
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 13, 0)
|
|
err = genl_register_family_with_ops(>p_genl_family, gtp_genl_ops);
|
|
if (err < 0)
|
|
return err;
|
|
#else
|
|
err = genl_register_family_with_ops(>p_genl_family,
|
|
gtp_genl_ops,
|
|
ARRAY_SIZE(gtp_genl_ops));
|
|
if (err < 0)
|
|
return err;
|
|
#endif
|
|
err = rtnl_link_register(>p_link_ops);
|
|
if (err < 0)
|
|
goto err1;
|
|
|
|
pr_info("GTP module loaded (pdp ctx size %Zd bytes)\n",
|
|
sizeof(struct pdp_ctx));
|
|
return 0;
|
|
err1:
|
|
pr_err("error loading GTP module loaded\n");
|
|
genl_unregister_family(>p_genl_family);
|
|
return err;
|
|
}
|
|
late_initcall(gtp_init);
|
|
|
|
static void __exit gtp_fini(void)
|
|
{
|
|
rtnl_link_unregister(>p_link_ops);
|
|
genl_unregister_family(>p_genl_family);
|
|
|
|
pr_info("GTP module unloaded\n");
|
|
}
|
|
module_exit(gtp_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>");
|
|
MODULE_ALIAS_RTNL_LINK("gtp");
|
|
MODULE_ALIAS_NETDEV("gtp0");
|