^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* GTP according to GSM TS 09.60 / 3GPP TS 29.060
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * (C) 2012-2014 by sysmocom - s.f.m.c. GmbH
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author: Harald Welte <hwelte@sysmocom.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Pablo Neira Ayuso <pablo@netfilter.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Andreas Schultz <aschultz@travelping.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/udp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/rculist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/jhash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/if_tunnel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/gtp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <net/net_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <net/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <net/udp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <net/udp_tunnel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <net/icmp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <net/xfrm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <net/genetlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <net/netns/generic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <net/gtp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /* An active session for the subscriber. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct pdp_ctx {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct hlist_node hlist_tid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct hlist_node hlist_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) u64 tid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) u16 flow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) } v0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) u32 i_tei;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) u32 o_tei;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) } v1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) } u;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) u8 gtp_version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) u16 af;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct in_addr ms_addr_ip4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct in_addr peer_addr_ip4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) atomic_t tx_seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct rcu_head rcu_head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /* One instance of the GTP device. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct gtp_dev {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct sock *sk0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct sock *sk1u;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) unsigned int role;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) unsigned int hash_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct hlist_head *tid_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct hlist_head *addr_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static unsigned int gtp_net_id __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) struct gtp_net {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) struct list_head gtp_dev_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static u32 gtp_h_initval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) static void pdp_context_delete(struct pdp_ctx *pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static inline u32 gtp0_hashfn(u64 tid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) u32 *tid32 = (u32 *) &tid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return jhash_2words(tid32[0], tid32[1], gtp_h_initval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static inline u32 gtp1u_hashfn(u32 tid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return jhash_1word(tid, gtp_h_initval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) static inline u32 ipv4_hashfn(__be32 ip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return jhash_1word((__force u32)ip, gtp_h_initval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /* Resolve a PDP context structure based on the 64bit TID. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) struct hlist_head *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) struct pdp_ctx *pdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) head = >p->tid_hash[gtp0_hashfn(tid) % gtp->hash_size];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (pdp->gtp_version == GTP_V0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) pdp->u.v0.tid == tid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return pdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /* Resolve a PDP context structure based on the 32bit TEI. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct hlist_head *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct pdp_ctx *pdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) head = >p->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (pdp->gtp_version == GTP_V1 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) pdp->u.v1.i_tei == tid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) return pdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /* Resolve a PDP context based on IPv4 address of MS. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) struct hlist_head *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct pdp_ctx *pdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) head = >p->addr_hash[ipv4_hashfn(ms_addr) % gtp->hash_size];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) hlist_for_each_entry_rcu(pdp, head, hlist_addr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (pdp->af == AF_INET &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) pdp->ms_addr_ip4.s_addr == ms_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return pdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) unsigned int hdrlen, unsigned int role)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) struct iphdr *iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (!pskb_may_pull(skb, hdrlen + sizeof(struct iphdr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) iph = (struct iphdr *)(skb->data + hdrlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (role == GTP_ROLE_SGSN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return iph->daddr == pctx->ms_addr_ip4.s_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) return iph->saddr == pctx->ms_addr_ip4.s_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) /* Check if the inner IP address in this packet is assigned to any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * existing mobile subscriber.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) static bool gtp_check_ms(struct sk_buff *skb, struct pdp_ctx *pctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) unsigned int hdrlen, unsigned int role)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) switch (ntohs(skb->protocol)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) case ETH_P_IP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) return gtp_check_ms_ipv4(skb, pctx, hdrlen, role);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) unsigned int hdrlen, unsigned int role)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (!gtp_check_ms(skb, pctx, hdrlen, role)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) netdev_dbg(pctx->dev, "No PDP ctx for this MS\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) /* Get rid of the GTP + UDP headers. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if (iptunnel_pull_header(skb, hdrlen, skb->protocol,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) !net_eq(sock_net(pctx->sk), dev_net(pctx->dev))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) /* Now that the UDP and the GTP header have been removed, set up the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) * new network header. This is required by the upper layer to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) * calculate the transport header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) skb->dev = pctx->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) dev_sw_netstats_rx_add(pctx->dev, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) netif_rx(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) unsigned int hdrlen = sizeof(struct udphdr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) sizeof(struct gtp0_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) struct gtp0_header *gtp0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) struct pdp_ctx *pctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (!pskb_may_pull(skb, hdrlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if ((gtp0->flags >> 5) != GTP_V0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (gtp0->type != GTP_TPDU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (!pctx) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) return gtp_rx(pctx, skb, hdrlen, gtp->role);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) unsigned int hdrlen = sizeof(struct udphdr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) sizeof(struct gtp1_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) struct gtp1_header *gtp1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) struct pdp_ctx *pctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) if (!pskb_may_pull(skb, hdrlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if ((gtp1->flags >> 5) != GTP_V1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) if (gtp1->type != GTP_TPDU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) /* From 29.060: "This field shall be present if and only if any one or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * more of the S, PN and E flags are set.".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * If any of the bit is set, then the remaining ones also have to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (gtp1->flags & GTP1_F_MASK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) hdrlen += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) /* Make sure the header is larger enough, including extensions. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (!pskb_may_pull(skb, hdrlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (!pctx) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return gtp_rx(pctx, skb, hdrlen, gtp->role);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) static void __gtp_encap_destroy(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) struct gtp_dev *gtp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) gtp = sk->sk_user_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) if (gtp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) if (gtp->sk0 == sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) gtp->sk0 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) gtp->sk1u = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) udp_sk(sk)->encap_type = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) rcu_assign_sk_user_data(sk, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) sock_put(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) release_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) static void gtp_encap_destroy(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) rtnl_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) __gtp_encap_destroy(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) rtnl_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) static void gtp_encap_disable_sock(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) if (!sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) __gtp_encap_destroy(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static void gtp_encap_disable(struct gtp_dev *gtp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) gtp_encap_disable_sock(gtp->sk0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) gtp_encap_disable_sock(gtp->sk1u);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) /* UDP encapsulation receive handler. See net/ipv4/udp.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) * Return codes: 0: success, <0: error, >0: pass up to userspace UDP socket.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) struct gtp_dev *gtp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) gtp = rcu_dereference_sk_user_data(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) if (!gtp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) switch (udp_sk(sk)->encap_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) case UDP_ENCAP_GTP0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) netdev_dbg(gtp->dev, "received GTP0 packet\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) ret = gtp0_udp_encap_recv(gtp, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) case UDP_ENCAP_GTP1U:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) netdev_dbg(gtp->dev, "received GTP1U packet\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) ret = gtp1u_udp_encap_recv(gtp, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) ret = -1; /* Shouldn't happen. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) netdev_dbg(gtp->dev, "pass up to the process\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) case -1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) netdev_dbg(gtp->dev, "GTP packet has been dropped\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) static int gtp_dev_init(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) struct gtp_dev *gtp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) gtp->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (!dev->tstats)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) static void gtp_dev_uninit(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) struct gtp_dev *gtp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) gtp_encap_disable(gtp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) free_percpu(dev->tstats);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) const struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) __be32 daddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) memset(fl4, 0, sizeof(*fl4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) fl4->flowi4_oif = sk->sk_bound_dev_if;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) fl4->daddr = daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) fl4->saddr = inet_sk(sk)->inet_saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) fl4->flowi4_tos = RT_CONN_FLAGS(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) fl4->flowi4_proto = sk->sk_protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return ip_route_output_key(sock_net(sk), fl4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) int payload_len = skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) struct gtp0_header *gtp0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) gtp0 = skb_push(skb, sizeof(*gtp0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) gtp0->flags = 0x1e; /* v0, GTP-non-prime. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) gtp0->type = GTP_TPDU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) gtp0->length = htons(payload_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) gtp0->seq = htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) gtp0->flow = htons(pctx->u.v0.flow);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) gtp0->number = 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) gtp0->spare[0] = gtp0->spare[1] = gtp0->spare[2] = 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) gtp0->tid = cpu_to_be64(pctx->u.v0.tid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) int payload_len = skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) struct gtp1_header *gtp1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) gtp1 = skb_push(skb, sizeof(*gtp1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) /* Bits 8 7 6 5 4 3 2 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) * +--+--+--+--+--+--+--+--+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) * |version |PT| 0| E| S|PN|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) * +--+--+--+--+--+--+--+--+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) * 0 0 1 1 1 0 0 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) gtp1->flags = 0x30; /* v1, GTP-non-prime. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) gtp1->type = GTP_TPDU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) gtp1->length = htons(payload_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) gtp1->tid = htonl(pctx->u.v1.o_tei);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) /* TODO: Suppport for extension header, sequence number and N-PDU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) * Update the length field if any of them is available.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) struct gtp_pktinfo {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) struct iphdr *iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) struct flowi4 fl4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) struct rtable *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) struct pdp_ctx *pctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) __be16 gtph_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) switch (pktinfo->pctx->gtp_version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) case GTP_V0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) pktinfo->gtph_port = htons(GTP0_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) gtp0_push_header(skb, pktinfo->pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) case GTP_V1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) pktinfo->gtph_port = htons(GTP1U_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) gtp1_push_header(skb, pktinfo->pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) struct sock *sk, struct iphdr *iph,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) struct pdp_ctx *pctx, struct rtable *rt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) struct flowi4 *fl4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) pktinfo->sk = sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) pktinfo->iph = iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) pktinfo->pctx = pctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) pktinfo->rt = rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) pktinfo->fl4 = *fl4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) pktinfo->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) struct gtp_pktinfo *pktinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) struct gtp_dev *gtp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) struct pdp_ctx *pctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) struct rtable *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) struct flowi4 fl4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) struct iphdr *iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) __be16 df;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) int mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) /* Read the IP destination address and resolve the PDP context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) * Prepend PDP header with TEI/TID from PDP ctx.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) iph = ip_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) if (gtp->role == GTP_ROLE_SGSN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) pctx = ipv4_pdp_find(gtp, iph->saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) pctx = ipv4_pdp_find(gtp, iph->daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if (!pctx) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) &iph->daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) netdev_dbg(dev, "found PDP context %p\n", pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->peer_addr_ip4.s_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) if (IS_ERR(rt)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) netdev_dbg(dev, "no route to SSGN %pI4\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) &pctx->peer_addr_ip4.s_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) dev->stats.tx_carrier_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (rt->dst.dev == dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) netdev_dbg(dev, "circular route to SSGN %pI4\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) &pctx->peer_addr_ip4.s_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) dev->stats.collisions++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) goto err_rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) skb_dst_drop(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) /* This is similar to tnl_update_pmtu(). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) df = iph->frag_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) if (df) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) mtu = dst_mtu(&rt->dst) - dev->hard_header_len -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) sizeof(struct iphdr) - sizeof(struct udphdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) switch (pctx->gtp_version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) case GTP_V0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) mtu -= sizeof(struct gtp0_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) case GTP_V1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) mtu -= sizeof(struct gtp1_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) mtu = dst_mtu(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) mtu < ntohs(iph->tot_len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) netdev_dbg(dev, "packet too big, fragmentation needed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) htonl(mtu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) goto err_rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) gtp_push_header(skb, pktinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) err_rt:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) ip_rt_put(rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) return -EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) unsigned int proto = ntohs(skb->protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) struct gtp_pktinfo pktinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) /* Ensure there is sufficient headroom. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) if (skb_cow_head(skb, dev->needed_headroom))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) goto tx_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) skb_reset_inner_headers(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) switch (proto) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) case ETH_P_IP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) err = gtp_build_skb_ip4(skb, dev, &pktinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) err = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) goto tx_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) switch (proto) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) case ETH_P_IP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) &pktinfo.iph->saddr, &pktinfo.iph->daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) pktinfo.fl4.saddr, pktinfo.fl4.daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) pktinfo.iph->tos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) ip4_dst_hoplimit(&pktinfo.rt->dst),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) pktinfo.gtph_port, pktinfo.gtph_port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) true, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) return NETDEV_TX_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) tx_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) dev->stats.tx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) dev_kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) return NETDEV_TX_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) static const struct net_device_ops gtp_netdev_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) .ndo_init = gtp_dev_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) .ndo_uninit = gtp_dev_uninit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) .ndo_start_xmit = gtp_dev_xmit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) .ndo_get_stats64 = ip_tunnel_get_stats64,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) static void gtp_link_setup(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) dev->netdev_ops = >p_netdev_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) dev->needs_free_netdev = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) dev->hard_header_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) dev->addr_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) /* Zero header length. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) dev->type = ARPHRD_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) dev->priv_flags |= IFF_NO_QUEUE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) dev->features |= NETIF_F_LLTX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) netif_keep_dst(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) /* Assume largest header, ie. GTPv0. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) dev->needed_headroom = LL_MAX_HEADER +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) sizeof(struct iphdr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) sizeof(struct udphdr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) sizeof(struct gtp0_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) static void gtp_destructor(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) struct gtp_dev *gtp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) kfree(gtp->addr_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) kfree(gtp->tid_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) static int gtp_newlink(struct net *src_net, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) struct nlattr *tb[], struct nlattr *data[],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) struct gtp_dev *gtp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) struct gtp_net *gn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) int hashsize, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) gtp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) if (!data[IFLA_GTP_PDP_HASHSIZE]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) hashsize = 1024;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) hashsize = nla_get_u32(data[IFLA_GTP_PDP_HASHSIZE]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) if (!hashsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) hashsize = 1024;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) err = gtp_hashtable_new(gtp, hashsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) err = gtp_encap_enable(gtp, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) goto out_hashtable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) err = register_netdevice(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) netdev_dbg(dev, "failed to register new netdev %d\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) goto out_encap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) gn = net_generic(dev_net(dev), gtp_net_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) list_add_rcu(>p->list, &gn->gtp_dev_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) dev->priv_destructor = gtp_destructor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) netdev_dbg(dev, "registered new GTP interface\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) out_encap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) gtp_encap_disable(gtp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) out_hashtable:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) kfree(gtp->addr_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) kfree(gtp->tid_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) static void gtp_dellink(struct net_device *dev, struct list_head *head)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) struct gtp_dev *gtp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) struct pdp_ctx *pctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) for (i = 0; i < gtp->hash_size; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) pdp_context_delete(pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) list_del_rcu(>p->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) unregister_netdevice_queue(dev, head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) [IFLA_GTP_FD0] = { .type = NLA_U32 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) [IFLA_GTP_FD1] = { .type = NLA_U32 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) [IFLA_GTP_ROLE] = { .type = NLA_U32 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) static int gtp_validate(struct nlattr *tb[], struct nlattr *data[],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) static size_t gtp_get_size(const struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) return nla_total_size(sizeof(__u32)); /* IFLA_GTP_PDP_HASHSIZE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) struct gtp_dev *gtp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) goto nla_put_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) nla_put_failure:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) static struct rtnl_link_ops gtp_link_ops __read_mostly = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) .kind = "gtp",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) .maxtype = IFLA_GTP_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) .policy = gtp_policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) .priv_size = sizeof(struct gtp_dev),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) .setup = gtp_link_setup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) .validate = gtp_validate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) .newlink = gtp_newlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) .dellink = gtp_dellink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) .get_size = gtp_get_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) .fill_info = gtp_fill_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) gtp->addr_hash = kmalloc_array(hsize, sizeof(struct hlist_head),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) GFP_KERNEL | __GFP_NOWARN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) if (gtp->addr_hash == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) gtp->tid_hash = kmalloc_array(hsize, sizeof(struct hlist_head),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) GFP_KERNEL | __GFP_NOWARN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) if (gtp->tid_hash == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) goto err1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) gtp->hash_size = hsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) for (i = 0; i < hsize; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) INIT_HLIST_HEAD(>p->addr_hash[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) INIT_HLIST_HEAD(>p->tid_hash[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) err1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) kfree(gtp->addr_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) static struct sock *gtp_encap_enable_socket(int fd, int type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) struct gtp_dev *gtp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) struct udp_tunnel_sock_cfg tuncfg = {NULL};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) struct socket *sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) pr_debug("enable gtp on %d, %d\n", fd, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) sock = sockfd_lookup(fd, &err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) if (!sock) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) pr_debug("gtp socket fd=%d not found\n", fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) sk = sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) if (sk->sk_protocol != IPPROTO_UDP ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) sk->sk_type != SOCK_DGRAM ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) pr_debug("socket fd=%d not UDP\n", fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) sk = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) goto out_sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) if (sk->sk_user_data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) sk = ERR_PTR(-EBUSY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) goto out_rel_sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) sock_hold(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) tuncfg.sk_user_data = gtp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) tuncfg.encap_type = type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) tuncfg.encap_rcv = gtp_encap_recv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) tuncfg.encap_destroy = gtp_encap_destroy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) setup_udp_tunnel_sock(sock_net(sock->sk), sock, &tuncfg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) out_rel_sock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) release_sock(sock->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) out_sock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) sockfd_put(sock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) return sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) struct sock *sk1u = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) struct sock *sk0 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) unsigned int role = GTP_ROLE_GGSN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) if (data[IFLA_GTP_FD0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) u32 fd0 = nla_get_u32(data[IFLA_GTP_FD0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) sk0 = gtp_encap_enable_socket(fd0, UDP_ENCAP_GTP0, gtp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) if (IS_ERR(sk0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) return PTR_ERR(sk0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) if (data[IFLA_GTP_FD1]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) u32 fd1 = nla_get_u32(data[IFLA_GTP_FD1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) sk1u = gtp_encap_enable_socket(fd1, UDP_ENCAP_GTP1U, gtp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) if (IS_ERR(sk1u)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) gtp_encap_disable_sock(sk0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) return PTR_ERR(sk1u);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) if (data[IFLA_GTP_ROLE]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) role = nla_get_u32(data[IFLA_GTP_ROLE]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) if (role > GTP_ROLE_SGSN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) gtp_encap_disable_sock(sk0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) gtp_encap_disable_sock(sk1u);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) gtp->sk0 = sk0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) gtp->sk1u = sk1u;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) gtp->role = role;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) struct gtp_dev *gtp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) struct net *net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) /* Examine the link attributes and figure out which network namespace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) * we are talking about.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) if (nla[GTPA_NET_NS_FD])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) net = get_net_ns_by_fd(nla_get_u32(nla[GTPA_NET_NS_FD]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) net = get_net(src_net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) if (IS_ERR(net))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) /* Check if there's an existing gtpX device to configure */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) dev = dev_get_by_index_rcu(net, nla_get_u32(nla[GTPA_LINK]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) if (dev && dev->netdev_ops == >p_netdev_ops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) gtp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) put_net(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) return gtp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) pctx->af = AF_INET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) pctx->peer_addr_ip4.s_addr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) pctx->ms_addr_ip4.s_addr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) switch (pctx->gtp_version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) case GTP_V0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) /* According to TS 09.60, sections 7.5.1 and 7.5.2, the flow
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) * label needs to be the same for uplink and downlink packets,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) * so let's annotate this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) pctx->u.v0.tid = nla_get_u64(info->attrs[GTPA_TID]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) pctx->u.v0.flow = nla_get_u16(info->attrs[GTPA_FLOW]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) case GTP_V1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) pctx->u.v1.i_tei = nla_get_u32(info->attrs[GTPA_I_TEI]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) pctx->u.v1.o_tei = nla_get_u32(info->attrs[GTPA_O_TEI]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) static struct pdp_ctx *gtp_pdp_add(struct gtp_dev *gtp, struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) struct genl_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) struct pdp_ctx *pctx, *pctx_tid = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) struct net_device *dev = gtp->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) u32 hash_ms, hash_tid = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) unsigned int version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) bool found = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) __be32 ms_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) version = nla_get_u32(info->attrs[GTPA_VERSION]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) pctx = ipv4_pdp_find(gtp, ms_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) if (pctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) found = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) if (version == GTP_V0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) pctx_tid = gtp0_pdp_find(gtp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) nla_get_u64(info->attrs[GTPA_TID]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) else if (version == GTP_V1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) pctx_tid = gtp1_pdp_find(gtp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) nla_get_u32(info->attrs[GTPA_I_TEI]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) if (pctx_tid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) found = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) if (found) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) return ERR_PTR(-EEXIST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) return ERR_PTR(-EOPNOTSUPP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) if (pctx && pctx_tid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) return ERR_PTR(-EEXIST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) if (!pctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) pctx = pctx_tid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) ipv4_pdp_fill(pctx, info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) if (pctx->gtp_version == GTP_V0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) pctx->u.v0.tid, pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) else if (pctx->gtp_version == GTP_V1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) netdev_dbg(dev, "GTPv1-U: update tunnel id = %x/%x (pdp %p)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) return pctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) pctx = kmalloc(sizeof(*pctx), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) if (pctx == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) sock_hold(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) pctx->sk = sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) pctx->dev = gtp->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) ipv4_pdp_fill(pctx, info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) atomic_set(&pctx->tx_seq, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) switch (pctx->gtp_version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) case GTP_V0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) /* TS 09.60: "The flow label identifies unambiguously a GTP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) * flow.". We use the tid for this instead, I cannot find a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) * situation in which this doesn't unambiguosly identify the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) * PDP context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) hash_tid = gtp0_hashfn(pctx->u.v0.tid) % gtp->hash_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) case GTP_V1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) hash_tid = gtp1u_hashfn(pctx->u.v1.i_tei) % gtp->hash_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) hlist_add_head_rcu(&pctx->hlist_addr, >p->addr_hash[hash_ms]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) hlist_add_head_rcu(&pctx->hlist_tid, >p->tid_hash[hash_tid]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) switch (pctx->gtp_version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) case GTP_V0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) pctx->u.v0.tid, &pctx->peer_addr_ip4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) &pctx->ms_addr_ip4, pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) case GTP_V1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) pctx->u.v1.i_tei, pctx->u.v1.o_tei,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) &pctx->peer_addr_ip4, &pctx->ms_addr_ip4, pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) return pctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) static void pdp_context_free(struct rcu_head *head)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) struct pdp_ctx *pctx = container_of(head, struct pdp_ctx, rcu_head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) sock_put(pctx->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) kfree(pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) static void pdp_context_delete(struct pdp_ctx *pctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) hlist_del_rcu(&pctx->hlist_tid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) hlist_del_rcu(&pctx->hlist_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) call_rcu(&pctx->rcu_head, pdp_context_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) static int gtp_tunnel_notify(struct pdp_ctx *pctx, u8 cmd, gfp_t allocation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) unsigned int version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) struct pdp_ctx *pctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) struct gtp_dev *gtp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) if (!info->attrs[GTPA_VERSION] ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) !info->attrs[GTPA_LINK] ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) !info->attrs[GTPA_PEER_ADDRESS] ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) !info->attrs[GTPA_MS_ADDRESS])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) version = nla_get_u32(info->attrs[GTPA_VERSION]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) switch (version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) case GTP_V0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) if (!info->attrs[GTPA_TID] ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) !info->attrs[GTPA_FLOW])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) case GTP_V1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) if (!info->attrs[GTPA_I_TEI] ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) !info->attrs[GTPA_O_TEI])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) rtnl_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) gtp = gtp_find_dev(sock_net(skb->sk), info->attrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) if (!gtp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) if (version == GTP_V0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) sk = gtp->sk0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) else if (version == GTP_V1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) sk = gtp->sk1u;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) sk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) if (!sk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) pctx = gtp_pdp_add(gtp, sk, info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) if (IS_ERR(pctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) err = PTR_ERR(pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) gtp_tunnel_notify(pctx, GTP_CMD_NEWPDP, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) rtnl_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) struct nlattr *nla[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) struct gtp_dev *gtp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) gtp = gtp_find_dev(net, nla);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) if (!gtp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) return ERR_PTR(-ENODEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) if (nla[GTPA_MS_ADDRESS]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) __be32 ip = nla_get_be32(nla[GTPA_MS_ADDRESS]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) return ipv4_pdp_find(gtp, ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) } else if (nla[GTPA_VERSION]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) u32 gtp_version = nla_get_u32(nla[GTPA_VERSION]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) if (gtp_version == GTP_V0 && nla[GTPA_TID])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) return gtp0_pdp_find(gtp, nla_get_u64(nla[GTPA_TID]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) else if (gtp_version == GTP_V1 && nla[GTPA_I_TEI])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) return gtp1_pdp_find(gtp, nla_get_u32(nla[GTPA_I_TEI]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) struct pdp_ctx *pctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) if (nla[GTPA_LINK])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) pctx = gtp_find_pdp_by_link(net, nla);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) pctx = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) if (!pctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) pctx = ERR_PTR(-ENOENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) return pctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) struct pdp_ctx *pctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) if (!info->attrs[GTPA_VERSION])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) if (IS_ERR(pctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) err = PTR_ERR(pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) if (pctx->gtp_version == GTP_V0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) netdev_dbg(pctx->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) pctx->u.v0.tid, pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) else if (pctx->gtp_version == GTP_V1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) netdev_dbg(pctx->dev, "GTPv1-U: deleting tunnel id = %x/%x (pdp %p)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) pctx->u.v1.i_tei, pctx->u.v1.o_tei, pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) gtp_tunnel_notify(pctx, GTP_CMD_DELPDP, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) pdp_context_delete(pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) static struct genl_family gtp_genl_family;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) enum gtp_multicast_groups {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) GTP_GENL_MCGRP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) static const struct genl_multicast_group gtp_genl_mcgrps[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) [GTP_GENL_MCGRP] = { .name = GTP_GENL_MCGRP_NAME },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) int flags, u32 type, struct pdp_ctx *pctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) void *genlh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) genlh = genlmsg_put(skb, snd_portid, snd_seq, >p_genl_family, flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) if (genlh == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) goto nlmsg_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) nla_put_u32(skb, GTPA_LINK, pctx->dev->ifindex) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer_addr_ip4.s_addr) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) goto nla_put_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) switch (pctx->gtp_version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) case GTP_V0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) nla_put_u16(skb, GTPA_FLOW, pctx->u.v0.flow))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) goto nla_put_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) case GTP_V1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) if (nla_put_u32(skb, GTPA_I_TEI, pctx->u.v1.i_tei) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) nla_put_u32(skb, GTPA_O_TEI, pctx->u.v1.o_tei))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) goto nla_put_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) genlmsg_end(skb, genlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) nlmsg_failure:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) nla_put_failure:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) genlmsg_cancel(skb, genlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) static int gtp_tunnel_notify(struct pdp_ctx *pctx, u8 cmd, gfp_t allocation)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) struct sk_buff *msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) msg = nlmsg_new(NLMSG_DEFAULT_SIZE, allocation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) if (!msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) ret = gtp_genl_fill_info(msg, 0, 0, 0, cmd, pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) nlmsg_free(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) ret = genlmsg_multicast_netns(>p_genl_family, dev_net(pctx->dev), msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) 0, GTP_GENL_MCGRP, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) struct pdp_ctx *pctx = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) struct sk_buff *skb2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) if (!info->attrs[GTPA_VERSION])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) pctx = gtp_find_pdp(sock_net(skb->sk), info->attrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) if (IS_ERR(pctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) err = PTR_ERR(pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) goto err_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) if (skb2 == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) goto err_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid, info->snd_seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) 0, info->nlhdr->nlmsg_type, pctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) goto err_unlock_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) return genlmsg_unicast(genl_info_net(info), skb2, info->snd_portid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) err_unlock_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) kfree_skb(skb2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) err_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) static int gtp_genl_dump_pdp(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) struct netlink_callback *cb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) struct gtp_dev *last_gtp = (struct gtp_dev *)cb->args[2], *gtp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) int i, j, bucket = cb->args[0], skip = cb->args[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) struct net *net = sock_net(skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) struct pdp_ctx *pctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) struct gtp_net *gn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) gn = net_generic(net, gtp_net_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) if (cb->args[4])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) list_for_each_entry_rcu(gtp, &gn->gtp_dev_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) if (last_gtp && last_gtp != gtp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) last_gtp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) for (i = bucket; i < gtp->hash_size; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) j = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) hlist_for_each_entry_rcu(pctx, >p->tid_hash[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) hlist_tid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) if (j >= skip &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) gtp_genl_fill_info(skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) NETLINK_CB(cb->skb).portid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) cb->nlh->nlmsg_seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) NLM_F_MULTI,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) cb->nlh->nlmsg_type, pctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) cb->args[0] = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) cb->args[1] = j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) cb->args[2] = (unsigned long)gtp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) j++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) skip = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) bucket = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) cb->args[4] = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) return skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) static const struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) [GTPA_LINK] = { .type = NLA_U32, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) [GTPA_VERSION] = { .type = NLA_U32, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) [GTPA_TID] = { .type = NLA_U64, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) [GTPA_PEER_ADDRESS] = { .type = NLA_U32, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) [GTPA_MS_ADDRESS] = { .type = NLA_U32, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) [GTPA_FLOW] = { .type = NLA_U16, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) [GTPA_NET_NS_FD] = { .type = NLA_U32, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) [GTPA_I_TEI] = { .type = NLA_U32, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) [GTPA_O_TEI] = { .type = NLA_U32, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) static const struct genl_small_ops gtp_genl_ops[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) .cmd = GTP_CMD_NEWPDP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) .doit = gtp_genl_new_pdp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) .flags = GENL_ADMIN_PERM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) .cmd = GTP_CMD_DELPDP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344) .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) .doit = gtp_genl_del_pdp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) .flags = GENL_ADMIN_PERM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) .cmd = GTP_CMD_GETPDP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) .doit = gtp_genl_get_pdp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) .dumpit = gtp_genl_dump_pdp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) .flags = GENL_ADMIN_PERM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) static struct genl_family gtp_genl_family __ro_after_init = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) .name = "gtp",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) .version = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) .hdrsize = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) .maxattr = GTPA_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) .policy = gtp_genl_policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) .netnsok = true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) .module = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) .small_ops = gtp_genl_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) .n_small_ops = ARRAY_SIZE(gtp_genl_ops),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) .mcgrps = gtp_genl_mcgrps,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) .n_mcgrps = ARRAY_SIZE(gtp_genl_mcgrps),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) static int __net_init gtp_net_init(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) struct gtp_net *gn = net_generic(net, gtp_net_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) INIT_LIST_HEAD(&gn->gtp_dev_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) static void __net_exit gtp_net_exit(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) struct gtp_net *gn = net_generic(net, gtp_net_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) struct gtp_dev *gtp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) LIST_HEAD(list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) rtnl_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) list_for_each_entry(gtp, &gn->gtp_dev_list, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) gtp_dellink(gtp->dev, &list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) unregister_netdevice_many(&list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) rtnl_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) static struct pernet_operations gtp_net_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) .init = gtp_net_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) .exit = gtp_net_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) .id = >p_net_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) .size = sizeof(struct gtp_net),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) static int __init gtp_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) get_random_bytes(>p_h_initval, sizeof(gtp_h_initval));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) err = rtnl_link_register(>p_link_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) goto error_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) err = genl_register_family(>p_genl_family);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) goto unreg_rtnl_link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) err = register_pernet_subsys(>p_net_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) goto unreg_genl_family;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) pr_info("GTP module loaded (pdp ctx size %zd bytes)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) sizeof(struct pdp_ctx));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) unreg_genl_family:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) genl_unregister_family(>p_genl_family);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) unreg_rtnl_link:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) rtnl_link_unregister(>p_link_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) error_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) pr_err("error loading GTP module loaded\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) late_initcall(gtp_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) static void __exit gtp_fini(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) genl_unregister_family(>p_genl_family);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) rtnl_link_unregister(>p_link_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) unregister_pernet_subsys(>p_net_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) pr_info("GTP module unloaded\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) module_exit(gtp_fini);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) MODULE_AUTHOR("Harald Welte <hwelte@sysmocom.de>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) MODULE_DESCRIPTION("Interface driver for GTP encapsulated traffic");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) MODULE_ALIAS_RTNL_LINK("gtp");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) MODULE_ALIAS_GENL_FAMILY("gtp");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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