osmocom-net-gprs January 2021

osmocom-net-gprs@lists.osmocom.org

3 participants
3 discussions

by morteza ali Ahmadi

Hi Osmocom team We have a basic question about libgtpnl (Linux Kernel GTP-U). We receive a lot of GTP <DNS> packets which are sent from MS to our HNB and from HNB to our SGSN (a screenshot is attached in this email). As you can see in the one of these packets in the attached image, our MS IP is 10.250.0.114 and our SGSN IP is 172.60.3.154. Also, our TEID is 100 which is set in RAB-Assignment Request sending from SGSN to HNB. In order to put these GTP packets in our GTP tunnel, we use libgtpnl and the two following commands: gtp-link add gtp1 gtp-tunnel add gtp1 v1 100 1 10.250.0.114 172.60.3.154 But when we monitor the gtp1 interface in the wireshark, there is no packet on this interface. Could you please help us to know the reason for this problem? (It is worth mentioning that after receiving these GTP <DNS> packets from MS to SGSN and using netstat, we see that Recv-Q (bytes in UDP port 2152 which are ready to read) is increased to a value more than 0) Best regards -- *When there is much light, The shadow is deep...*

3 years, 2 months

Question about establishing an internet connection between MS and network core

by morteza ali Ahmadi

Hi Osmocom team. We are sorry to disturb you. We have a question about establishing a stable internet connection (IuPS_PS) between MS and our developed network core system using our home nodeB (HNB). We set *Primary DNS Address: 172.60.3.154 *(core IP) and *Secondary DNS Address: 8.8.8.8* in *Activate PDP Context Accept.* At this step, we can see the MS packets in the interface between HNB and core using wireshark. The protocol is *GTP <DNS>* and the stacked layers are *DNS / UDP / IP / GTP / UDP / IP* which I attached a screenshot of the wireshark log. As you can see in the attached image, our query in the MS is *server.hnb* *(http://server.hnb <http://server.hnb>)*. In order to show our default page to the user query, we set up a DNS server and HTTP server (Apache) in 172.60.3.154 and *BIND9* is configured as the primary server for the domain *server.hnb*. The command *dig @localhost server.hnb* outputs the following: ; <<>> DiG 9.16.1-Ubuntu <<>> @localhost server.hnb ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49532 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ; COOKIE: 15821f64047895870100000060070fb921a17af91fd22f9f (good) ;; QUESTION SECTION: ;server.hnb. IN A ;; ANSWER SECTION: server.hnb. 604800 IN A 172.60.3.154 ;; Query time: 0 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Jan 19 20:28:33 +0330 2021 ;; MSG SIZE rcvd: 83 and also when we query *http://server.hnb <http://server.hnb> *in the browser of the core system (172.60.3.154), we see the * Apache2 Ubuntu Default Page* but this default page is not shown in the MS. Furthermore, we think that a GTP tunnel may be required and we set up a GTP tunnel using *libgtpnl* and the two following commands: gtp-link add gtp1 gtp-tunnel add gtp1 v1 1 100 10.250.0.114 172.60.3.154 where 1 is the gTP-TEI obtained in *RAB-Assignment Response *and 100 is the similar field in *RAB-Assignment Request. *Also, 10.250.0.114 is the MS IP and 172.60.3.154 is the core IP. But there is no captured package in this tunnel (using wireshark). Could you please help us to solve this problem which is mentioned in the following questions? Is the above procedure performed in the correct way? We want to show our default page in MS when the user query is* http://server.hnb <http://server.hnb>*, but we think that a GTP manager is required to split the (( DNS / UDP / IP )) layers from (( DNS / UDP / IP / GTP / UDP / IP )) to send to DNS server. How can it be solved, if this assumption is correct? Thank you again for spending time with us. Best regards, Morteza Ali Ahmadi -- *When there is much light, The shadow is deep...*

3 years, 3 months

Re: [PATCH net-next v4] GTP: add support for flow based tunneling API

by Jakub Kicinski

On Tue, 5 Jan 2021 20:45:05 -0800 Pravin B Shelar wrote: > Following patch add support for LWT flow based tunneling API > to send and recv GTP tunnel packet over tunnel metadata API. > This would allow this device integration with OVS or eBPF using > flow based tunneling APIs. > > Signed-off-by: Pravin B Shelar <pbshelar(a)fb.com> GTP folks please review. > v3-v4: > - add check for non-zero dst port > v2-v3: > - Fixed coding style > - changed IFLA_GTP_FD1 to optional param for LWT dev. > v1-v2: > - Fixed according to comments from Jonas Bonn > > drivers/net/gtp.c | 528 +++++++++++++++++++++-------- > include/uapi/linux/gtp.h | 12 + > include/uapi/linux/if_link.h | 1 + > include/uapi/linux/if_tunnel.h | 1 + > tools/include/uapi/linux/if_link.h | 1 + > 5 files changed, 399 insertions(+), 144 deletions(-) > > diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c > index 4c04e271f184..fc9d843df736 100644 > --- a/drivers/net/gtp.c > +++ b/drivers/net/gtp.c > @@ -21,6 +21,7 @@ > #include <linux/file.h> > #include <linux/gtp.h> > > +#include <net/dst_metadata.h> > #include <net/net_namespace.h> > #include <net/protocol.h> > #include <net/ip.h> > @@ -73,6 +74,9 @@ struct gtp_dev { > unsigned int hash_size; > struct hlist_head *tid_hash; > struct hlist_head *addr_hash; > + /* Used by LWT tunnel. */ > + bool collect_md; > + struct socket *collect_md_sock; > }; > > static unsigned int gtp_net_id __read_mostly; > @@ -179,33 +183,121 @@ static bool gtp_check_ms(struct sk_buff *skb, struct pdp_ctx *pctx, > return false; > } > > -static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb, > - unsigned int hdrlen, unsigned int role) > +static int gtp_set_tun_dst(struct gtp_dev *gtp, struct sk_buff *skb, > + unsigned int hdrlen, u8 gtp_version, > + __be64 tid, u8 flags) > { > - if (!gtp_check_ms(skb, pctx, hdrlen, role)) { > - netdev_dbg(pctx->dev, "No PDP ctx for this MS\n"); > - return 1; > + struct metadata_dst *tun_dst; > + int opts_len = 0; > + > + if (unlikely(flags & GTP1_F_MASK)) > + opts_len = sizeof(struct gtpu_metadata); > + > + tun_dst = udp_tun_rx_dst(skb, gtp->sk1u->sk_family, TUNNEL_KEY, tid, opts_len); > + if (!tun_dst) { > + netdev_dbg(gtp->dev, "Failed to allocate tun_dst"); > + goto err; > } > > + netdev_dbg(gtp->dev, "attaching metadata_dst to skb, gtp ver %d hdrlen %d\n", > + gtp_version, hdrlen); > + if (unlikely(opts_len)) { > + struct gtpu_metadata *opts; > + struct gtp1_header *gtp1; > + > + opts = ip_tunnel_info_opts(&tun_dst->u.tun_info); > + gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); > + opts->ver = GTP_METADATA_V1; > + opts->flags = gtp1->flags; > + opts->type = gtp1->type; > + netdev_dbg(gtp->dev, "recved control pkt: flag %x type: %d\n", > + opts->flags, opts->type); > + tun_dst->u.tun_info.key.tun_flags |= TUNNEL_GTPU_OPT; > + tun_dst->u.tun_info.options_len = opts_len; > + skb->protocol = htons(0xffff); /* Unknown */ > + } > /* Get rid of the GTP + UDP headers. */ > if (iptunnel_pull_header(skb, hdrlen, skb->protocol, > - !net_eq(sock_net(pctx->sk), dev_net(pctx->dev)))) > - return -1; > + !net_eq(sock_net(gtp->sk1u), dev_net(gtp->dev)))) { > + gtp->dev->stats.rx_length_errors++; > + goto err; > + } > + > + skb_dst_set(skb, &tun_dst->dst); > + return 0; > +err: > + return -1; > +} > + > +static int gtp_rx(struct gtp_dev *gtp, struct sk_buff *skb, > + unsigned int hdrlen, u8 gtp_version, unsigned int role, > + __be64 tid, u8 flags, u8 type) > +{ > + if (ip_tunnel_collect_metadata() || gtp->collect_md) { > + int err; > + > + err = gtp_set_tun_dst(gtp, skb, hdrlen, gtp_version, tid, flags); > + if (err) > + goto err; > + } else { > + struct pdp_ctx *pctx; > + > + if (flags & GTP1_F_MASK) > + hdrlen += 4; > > - netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n"); > + if (type != GTP_TPDU) > + return 1; > + > + if (gtp_version == GTP_V0) > + pctx = gtp0_pdp_find(gtp, be64_to_cpu(tid)); > + else > + pctx = gtp1_pdp_find(gtp, be64_to_cpu(tid)); > + if (!pctx) { > + netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); > + return 1; > + } > + > + if (!gtp_check_ms(skb, pctx, hdrlen, role)) { > + netdev_dbg(pctx->dev, "No PDP ctx for this MS\n"); > + return 1; > + } > + /* Get rid of the GTP + UDP headers. */ > + if (iptunnel_pull_header(skb, hdrlen, skb->protocol, > + !net_eq(sock_net(pctx->sk), dev_net(gtp->dev)))) { > + gtp->dev->stats.rx_length_errors++; > + goto err; > + } > + } > + netdev_dbg(gtp->dev, "forwarding packet from GGSN to uplink\n"); > > /* Now that the UDP and the GTP header have been removed, set up the > * new network header. This is required by the upper layer to > * calculate the transport header. > */ > skb_reset_network_header(skb); > + if (pskb_may_pull(skb, sizeof(struct iphdr))) { > + struct iphdr *iph; > + > + iph = ip_hdr(skb); > + if (iph->version == 4) { > + netdev_dbg(gtp->dev, "inner pkt: ipv4"); > + skb->protocol = htons(ETH_P_IP); > + } else if (iph->version == 6) { > + netdev_dbg(gtp->dev, "inner pkt: ipv6"); > + skb->protocol = htons(ETH_P_IPV6); > + } else { > + netdev_dbg(gtp->dev, "inner pkt error: Unknown type"); > + } > + } > > - skb->dev = pctx->dev; > - > - dev_sw_netstats_rx_add(pctx->dev, skb->len); > - > + skb->dev = gtp->dev; > + dev_sw_netstats_rx_add(gtp->dev, skb->len); > netif_rx(skb); > return 0; > + > +err: > + gtp->dev->stats.rx_dropped++; > + return -1; > } > > /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */ > @@ -214,7 +306,6 @@ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) > unsigned int hdrlen = sizeof(struct udphdr) + > sizeof(struct gtp0_header); > struct gtp0_header *gtp0; > - struct pdp_ctx *pctx; > > if (!pskb_may_pull(skb, hdrlen)) > return -1; > @@ -224,16 +315,7 @@ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) > if ((gtp0->flags >> 5) != GTP_V0) > return 1; > > - if (gtp0->type != GTP_TPDU) > - return 1; > - > - pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid)); > - if (!pctx) { > - netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); > - return 1; > - } > - > - return gtp_rx(pctx, skb, hdrlen, gtp->role); > + return gtp_rx(gtp, skb, hdrlen, GTP_V0, gtp->role, gtp0->tid, gtp0->flags, gtp0->type); > } > > static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) > @@ -241,41 +323,30 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb) > unsigned int hdrlen = sizeof(struct udphdr) + > sizeof(struct gtp1_header); > struct gtp1_header *gtp1; > - struct pdp_ctx *pctx; > > if (!pskb_may_pull(skb, hdrlen)) > return -1; > > gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); > > + netdev_dbg(gtp->dev, "GTPv1 recv: flags %x\n", gtp1->flags); > if ((gtp1->flags >> 5) != GTP_V1) > return 1; > > - if (gtp1->type != GTP_TPDU) > - return 1; > - > /* From 29.060: "This field shall be present if and only if any one or > * more of the S, PN and E flags are set.". > * > * If any of the bit is set, then the remaining ones also have to be > * set. > */ > - if (gtp1->flags & GTP1_F_MASK) > - hdrlen += 4; > - > /* Make sure the header is larger enough, including extensions. */ > if (!pskb_may_pull(skb, hdrlen)) > return -1; > > gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr)); > > - pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid)); > - if (!pctx) { > - netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb); > - return 1; > - } > - > - return gtp_rx(pctx, skb, hdrlen, gtp->role); > + return gtp_rx(gtp, skb, hdrlen, GTP_V1, gtp->role, > + key32_to_tunnel_id(gtp1->tid), gtp1->flags, gtp1->type); > } > > static void __gtp_encap_destroy(struct sock *sk) > @@ -315,6 +386,11 @@ static void gtp_encap_disable(struct gtp_dev *gtp) > { > gtp_encap_disable_sock(gtp->sk0); > gtp_encap_disable_sock(gtp->sk1u); > + if (gtp->collect_md_sock) { > + udp_tunnel_sock_release(gtp->collect_md_sock); > + gtp->collect_md_sock = NULL; > + netdev_dbg(gtp->dev, "GTP socket released.\n"); > + } > } > > /* UDP encapsulation receive handler. See net/ipv4/udp.c. > @@ -329,7 +405,8 @@ static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) > if (!gtp) > return 1; > > - netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk); > + netdev_dbg(gtp->dev, "encap_recv sk=%p type %d\n", > + sk, udp_sk(sk)->encap_type); > > switch (udp_sk(sk)->encap_type) { > case UDP_ENCAP_GTP0: > @@ -383,12 +460,13 @@ static void gtp_dev_uninit(struct net_device *dev) > > static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4, > const struct sock *sk, > - __be32 daddr) > + __be32 daddr, > + __be32 saddr) > { > memset(fl4, 0, sizeof(*fl4)); > fl4->flowi4_oif = sk->sk_bound_dev_if; > fl4->daddr = daddr; > - fl4->saddr = inet_sk(sk)->inet_saddr; > + fl4->saddr = saddr; > fl4->flowi4_tos = RT_CONN_FLAGS(sk); > fl4->flowi4_proto = sk->sk_protocol; > > @@ -412,7 +490,7 @@ static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) > gtp0->tid = cpu_to_be64(pctx->u.v0.tid); > } > > -static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) > +static inline void gtp1_push_header(struct sk_buff *skb, __be32 tid) > { > int payload_len = skb->len; > struct gtp1_header *gtp1; > @@ -428,46 +506,63 @@ static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx) > gtp1->flags = 0x30; /* v1, GTP-non-prime. */ > gtp1->type = GTP_TPDU; > gtp1->length = htons(payload_len); > - gtp1->tid = htonl(pctx->u.v1.o_tei); > + gtp1->tid = tid; > > /* TODO: Suppport for extension header, sequence number and N-PDU. > * Update the length field if any of them is available. > */ > } > > -struct gtp_pktinfo { > - struct sock *sk; > - struct iphdr *iph; > - struct flowi4 fl4; > - struct rtable *rt; > - struct pdp_ctx *pctx; > - struct net_device *dev; > - __be16 gtph_port; > -}; > - > -static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo) > +static inline int gtp1_push_control_header(struct sk_buff *skb, > + __be32 tid, > + struct gtpu_metadata *opts, > + struct net_device *dev) > { > - switch (pktinfo->pctx->gtp_version) { > - case GTP_V0: > - pktinfo->gtph_port = htons(GTP0_PORT); > - gtp0_push_header(skb, pktinfo->pctx); > - break; > - case GTP_V1: > - pktinfo->gtph_port = htons(GTP1U_PORT); > - gtp1_push_header(skb, pktinfo->pctx); > - break; > + struct gtp1_header *gtp1c; > + int payload_len; > + > + if (opts->ver != GTP_METADATA_V1) > + return -ENOENT; > + > + if (opts->type == 0xFE) { > + /* for end marker ignore skb data. */ > + netdev_dbg(dev, "xmit pkt with null data"); > + pskb_trim(skb, 0); > } > + if (skb_cow_head(skb, sizeof(*gtp1c)) < 0) > + return -ENOMEM; > + > + payload_len = skb->len; > + > + gtp1c = skb_push(skb, sizeof(*gtp1c)); > + > + gtp1c->flags = opts->flags; > + gtp1c->type = opts->type; > + gtp1c->length = htons(payload_len); > + gtp1c->tid = tid; > + netdev_dbg(dev, "xmit control pkt: ver %d flags %x type %x pkt len %d tid %x", > + opts->ver, opts->flags, opts->type, skb->len, tid); > + return 0; > } > > +struct gtp_pktinfo { > + struct sock *sk; > + __u8 tos; > + struct flowi4 fl4; > + struct rtable *rt; > + struct net_device *dev; > + __be16 gtph_port; > +}; > + > static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo, > - struct sock *sk, struct iphdr *iph, > - struct pdp_ctx *pctx, struct rtable *rt, > + struct sock *sk, > + __u8 tos, > + struct rtable *rt, > struct flowi4 *fl4, > struct net_device *dev) > { > pktinfo->sk = sk; > - pktinfo->iph = iph; > - pktinfo->pctx = pctx; > + pktinfo->tos = tos; > pktinfo->rt = rt; > pktinfo->fl4 = *fl4; > pktinfo->dev = dev; > @@ -477,40 +572,99 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, > struct gtp_pktinfo *pktinfo) > { > struct gtp_dev *gtp = netdev_priv(dev); > + struct gtpu_metadata *opts = NULL; > struct pdp_ctx *pctx; > struct rtable *rt; > struct flowi4 fl4; > - struct iphdr *iph; > - __be16 df; > + struct sock *sk = NULL; > + __be32 tun_id; > + __be32 daddr; > + __be32 saddr; > + u8 gtp_version; > int mtu; > + __u8 tos; > + __be16 df = 0; > > - /* Read the IP destination address and resolve the PDP context. > - * Prepend PDP header with TEI/TID from PDP ctx. > - */ > - iph = ip_hdr(skb); > - if (gtp->role == GTP_ROLE_SGSN) > - pctx = ipv4_pdp_find(gtp, iph->saddr); > - else > - pctx = ipv4_pdp_find(gtp, iph->daddr); > + if (gtp->collect_md) { > + /* LWT GTP1U encap */ > + struct ip_tunnel_info *info = NULL; > > - if (!pctx) { > - netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n", > - &iph->daddr); > - return -ENOENT; > + info = skb_tunnel_info(skb); > + if (!info) { > + netdev_dbg(dev, "missing tunnel info"); > + return -ENOENT; > + } > + if (info->key.tp_dst && ntohs(info->key.tp_dst) != GTP1U_PORT) { > + netdev_dbg(dev, "unexpected GTP dst port: %d", ntohs(info->key.tp_dst)); > + return -EOPNOTSUPP; > + } > + pctx = NULL; > + gtp_version = GTP_V1; > + tun_id = tunnel_id_to_key32(info->key.tun_id); > + daddr = info->key.u.ipv4.dst; > + saddr = info->key.u.ipv4.src; > + sk = gtp->sk1u; > + if (!sk) { > + netdev_dbg(dev, "missing tunnel sock"); > + return -EOPNOTSUPP; > + } > + tos = info->key.tos; > + if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) > + df = htons(IP_DF); > + > + if (info->options_len != 0) { > + if (info->key.tun_flags & TUNNEL_GTPU_OPT) { > + opts = ip_tunnel_info_opts(info); > + } else { > + netdev_dbg(dev, "missing tunnel metadata for control pkt"); > + return -EOPNOTSUPP; > + } > + } > + netdev_dbg(dev, "flow-based GTP1U encap: tunnel id %d\n", > + be32_to_cpu(tun_id)); > + } else { > + struct iphdr *iph; > + > + if (ntohs(skb->protocol) != ETH_P_IP) > + return -EOPNOTSUPP; > + > + iph = ip_hdr(skb); > + > + /* Read the IP destination address and resolve the PDP context. > + * Prepend PDP header with TEI/TID from PDP ctx. > + */ > + if (gtp->role == GTP_ROLE_SGSN) > + pctx = ipv4_pdp_find(gtp, iph->saddr); > + else > + pctx = ipv4_pdp_find(gtp, iph->daddr); > + > + if (!pctx) { > + netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n", > + &iph->daddr); > + return -ENOENT; > + } > + sk = pctx->sk; > + netdev_dbg(dev, "found PDP context %p\n", pctx); > + > + gtp_version = pctx->gtp_version; > + tun_id = htonl(pctx->u.v1.o_tei); > + daddr = pctx->peer_addr_ip4.s_addr; > + saddr = inet_sk(sk)->inet_saddr; > + tos = iph->tos; > + df = iph->frag_off; > + netdev_dbg(dev, "gtp -> IP src: %pI4 dst: %pI4\n", > + &iph->saddr, &iph->daddr); > } > - netdev_dbg(dev, "found PDP context %p\n", pctx); > > - rt = ip4_route_output_gtp(&fl4, pctx->sk, pctx->peer_addr_ip4.s_addr); > + rt = ip4_route_output_gtp(&fl4, sk, daddr, saddr); > if (IS_ERR(rt)) { > - netdev_dbg(dev, "no route to SSGN %pI4\n", > - &pctx->peer_addr_ip4.s_addr); > + netdev_dbg(dev, "no route to SSGN %pI4\n", &daddr); > dev->stats.tx_carrier_errors++; > goto err; > } > > if (rt->dst.dev == dev) { > - netdev_dbg(dev, "circular route to SSGN %pI4\n", > - &pctx->peer_addr_ip4.s_addr); > + netdev_dbg(dev, "circular route to SSGN %pI4\n", &daddr); > dev->stats.collisions++; > goto err_rt; > } > @@ -518,11 +672,10 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, > skb_dst_drop(skb); > > /* This is similar to tnl_update_pmtu(). */ > - df = iph->frag_off; > if (df) { > mtu = dst_mtu(&rt->dst) - dev->hard_header_len - > sizeof(struct iphdr) - sizeof(struct udphdr); > - switch (pctx->gtp_version) { > + switch (gtp_version) { > case GTP_V0: > mtu -= sizeof(struct gtp0_header); > break; > @@ -536,17 +689,38 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, > > rt->dst.ops->update_pmtu(&rt->dst, NULL, skb, mtu, false); > > - if (!skb_is_gso(skb) && (iph->frag_off & htons(IP_DF)) && > - mtu < ntohs(iph->tot_len)) { > - netdev_dbg(dev, "packet too big, fragmentation needed\n"); > + if (!skb_is_gso(skb) && (df & htons(IP_DF)) && mtu < skb->len) { > + netdev_dbg(dev, "packet too big, fragmentation needed"); > memset(IPCB(skb), 0, sizeof(*IPCB(skb))); > icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, > htonl(mtu)); > goto err_rt; > } > > - gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev); > - gtp_push_header(skb, pktinfo); > + gtp_set_pktinfo_ipv4(pktinfo, sk, tos, rt, &fl4, dev); > + > + if (unlikely(opts)) { > + int err; > + > + pktinfo->gtph_port = htons(GTP1U_PORT); > + err = gtp1_push_control_header(skb, tun_id, opts, dev); > + if (err) { > + netdev_info(dev, "cntr pkt error %d", err); > + goto err_rt; > + } > + return 0; > + } > + > + switch (gtp_version) { > + case GTP_V0: > + pktinfo->gtph_port = htons(GTP0_PORT); > + gtp0_push_header(skb, pctx); > + break; > + case GTP_V1: > + pktinfo->gtph_port = htons(GTP1U_PORT); > + gtp1_push_header(skb, tun_id); > + break; > + } > > return 0; > err_rt: > @@ -557,7 +731,6 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev, > > static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev) > { > - unsigned int proto = ntohs(skb->protocol); > struct gtp_pktinfo pktinfo; > int err; > > @@ -569,32 +742,22 @@ static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev) > > /* PDP context lookups in gtp_build_skb_*() need rcu read-side lock. */ > rcu_read_lock(); > - switch (proto) { > - case ETH_P_IP: > - err = gtp_build_skb_ip4(skb, dev, &pktinfo); > - break; > - default: > - err = -EOPNOTSUPP; > - break; > - } > + err = gtp_build_skb_ip4(skb, dev, &pktinfo); > rcu_read_unlock(); > > if (err < 0) > goto tx_err; > > - switch (proto) { > - case ETH_P_IP: > - netdev_dbg(pktinfo.dev, "gtp -> IP src: %pI4 dst: %pI4\n", > - &pktinfo.iph->saddr, &pktinfo.iph->daddr); > - udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb, > - pktinfo.fl4.saddr, pktinfo.fl4.daddr, > - pktinfo.iph->tos, > - ip4_dst_hoplimit(&pktinfo.rt->dst), > - 0, > - pktinfo.gtph_port, pktinfo.gtph_port, > - true, false); > - break; > - } > + udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb, > + pktinfo.fl4.saddr, > + pktinfo.fl4.daddr, > + pktinfo.tos, > + ip4_dst_hoplimit(&pktinfo.rt->dst), > + 0, > + pktinfo.gtph_port, > + pktinfo.gtph_port, > + true, > + false); > > return NETDEV_TX_OK; > tx_err: > @@ -610,6 +773,19 @@ static const struct net_device_ops gtp_netdev_ops = { > .ndo_get_stats64 = dev_get_tstats64, > }; > > +static struct gtp_dev *gtp_find_flow_based_dev(struct net *net) > +{ > + struct gtp_net *gn = net_generic(net, gtp_net_id); > + struct gtp_dev *gtp; > + > + list_for_each_entry(gtp, &gn->gtp_dev_list, list) { > + if (gtp->collect_md) > + return gtp; > + } > + > + return NULL; > +} > + > static void gtp_link_setup(struct net_device *dev) > { > dev->netdev_ops = &gtp_netdev_ops; > @@ -634,7 +810,7 @@ static void gtp_link_setup(struct net_device *dev) > } > > static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize); > -static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]); > +static int gtp_encap_enable(struct gtp_dev *gtp, struct net_device *dev, struct nlattr *data[]); > > static void gtp_destructor(struct net_device *dev) > { > @@ -652,11 +828,24 @@ static int gtp_newlink(struct net *src_net, struct net_device *dev, > struct gtp_net *gn; > int hashsize, err; > > - if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1]) > + if (!data[IFLA_GTP_FD0] && !data[IFLA_GTP_FD1] && > + !data[IFLA_GTP_COLLECT_METADATA]) > return -EINVAL; > > gtp = netdev_priv(dev); > > + if (data[IFLA_GTP_COLLECT_METADATA]) { > + if (data[IFLA_GTP_FD0]) { > + netdev_dbg(dev, "LWT device does not support setting v0 socket"); > + return -EINVAL; > + } > + if (gtp_find_flow_based_dev(src_net)) { > + netdev_dbg(dev, "LWT device already exist"); > + return -EBUSY; > + } > + gtp->collect_md = true; > + } > + > if (!data[IFLA_GTP_PDP_HASHSIZE]) { > hashsize = 1024; > } else { > @@ -669,7 +858,7 @@ static int gtp_newlink(struct net *src_net, struct net_device *dev, > if (err < 0) > return err; > > - err = gtp_encap_enable(gtp, data); > + err = gtp_encap_enable(gtp, dev, data); > if (err < 0) > goto out_hashtable; > > @@ -683,7 +872,7 @@ static int gtp_newlink(struct net *src_net, struct net_device *dev, > list_add_rcu(&gtp->list, &gn->gtp_dev_list); > dev->priv_destructor = gtp_destructor; > > - netdev_dbg(dev, "registered new GTP interface\n"); > + netdev_dbg(dev, "registered new GTP interface %s\n", dev->name); > > return 0; > > @@ -706,6 +895,7 @@ static void gtp_dellink(struct net_device *dev, struct list_head *head) > pdp_context_delete(pctx); > > list_del_rcu(&gtp->list); > + > unregister_netdevice_queue(dev, head); > } > > @@ -714,6 +904,7 @@ static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = { > [IFLA_GTP_FD1] = { .type = NLA_U32 }, > [IFLA_GTP_PDP_HASHSIZE] = { .type = NLA_U32 }, > [IFLA_GTP_ROLE] = { .type = NLA_U32 }, > + [IFLA_GTP_COLLECT_METADATA] = { .type = NLA_FLAG }, > }; > > static int gtp_validate(struct nlattr *tb[], struct nlattr *data[], > @@ -737,6 +928,9 @@ static int gtp_fill_info(struct sk_buff *skb, const struct net_device *dev) > if (nla_put_u32(skb, IFLA_GTP_PDP_HASHSIZE, gtp->hash_size)) > goto nla_put_failure; > > + if (gtp->collect_md && nla_put_flag(skb, IFLA_GTP_COLLECT_METADATA)) > + goto nla_put_failure; > + > return 0; > > nla_put_failure: > @@ -782,35 +976,24 @@ static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize) > return -ENOMEM; > } > > -static struct sock *gtp_encap_enable_socket(int fd, int type, > - struct gtp_dev *gtp) > +static int __gtp_encap_enable_socket(struct socket *sock, int type, > + struct gtp_dev *gtp) > { > struct udp_tunnel_sock_cfg tuncfg = {NULL}; > - struct socket *sock; > struct sock *sk; > - int err; > - > - pr_debug("enable gtp on %d, %d\n", fd, type); > - > - sock = sockfd_lookup(fd, &err); > - if (!sock) { > - pr_debug("gtp socket fd=%d not found\n", fd); > - return NULL; > - } > > sk = sock->sk; > if (sk->sk_protocol != IPPROTO_UDP || > sk->sk_type != SOCK_DGRAM || > (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)) { > - pr_debug("socket fd=%d not UDP\n", fd); > - sk = ERR_PTR(-EINVAL); > - goto out_sock; > + pr_debug("socket not UDP\n"); > + return -EINVAL; > } > > lock_sock(sk); > if (sk->sk_user_data) { > - sk = ERR_PTR(-EBUSY); > - goto out_rel_sock; > + release_sock(sock->sk); > + return -EBUSY; > } > > sock_hold(sk); > @@ -821,15 +1004,58 @@ static struct sock *gtp_encap_enable_socket(int fd, int type, > tuncfg.encap_destroy = gtp_encap_destroy; > > setup_udp_tunnel_sock(sock_net(sock->sk), sock, &tuncfg); > - > -out_rel_sock: > release_sock(sock->sk); > -out_sock: > + return 0; > +} > + > +static struct sock *gtp_encap_enable_socket(int fd, int type, > + struct gtp_dev *gtp) > +{ > + struct socket *sock; > + int err; > + > + pr_debug("enable gtp on %d, %d\n", fd, type); > + > + sock = sockfd_lookup(fd, &err); > + if (!sock) { > + pr_debug("gtp socket fd=%d not found\n", fd); > + return NULL; > + } > + err = __gtp_encap_enable_socket(sock, type, gtp); > sockfd_put(sock); > - return sk; > + if (err) > + return ERR_PTR(err); > + > + return sock->sk; > } > > -static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]) > +static struct socket *gtp_create_gtp_socket(struct gtp_dev *gtp, struct net_device *dev) > +{ > + struct udp_port_cfg udp_conf; > + struct socket *sock; > + int err; > + > + memset(&udp_conf, 0, sizeof(udp_conf)); > + udp_conf.family = AF_INET; > + udp_conf.local_ip.s_addr = htonl(INADDR_ANY); > + udp_conf.local_udp_port = htons(GTP1U_PORT); > + > + err = udp_sock_create(dev_net(dev), &udp_conf, &sock); > + if (err < 0) { > + pr_debug("create gtp sock failed: %d\n", err); > + return ERR_PTR(err); > + } > + err = __gtp_encap_enable_socket(sock, UDP_ENCAP_GTP1U, gtp); > + if (err) { > + pr_debug("enable gtp sock encap failed: %d\n", err); > + udp_tunnel_sock_release(sock); > + return ERR_PTR(err); > + } > + pr_debug("create gtp sock done\n"); > + return sock; > +} > + > +static int gtp_encap_enable(struct gtp_dev *gtp, struct net_device *dev, struct nlattr *data[]) > { > struct sock *sk1u = NULL; > struct sock *sk0 = NULL; > @@ -853,11 +1079,25 @@ static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[]) > } > } > > + if (data[IFLA_GTP_COLLECT_METADATA]) { > + struct socket *sock; > + > + if (!sk1u) { > + sock = gtp_create_gtp_socket(gtp, dev); > + if (IS_ERR(sock)) > + return PTR_ERR(sock); > + > + gtp->collect_md_sock = sock; > + sk1u = sock->sk; > + } else { > + gtp->collect_md_sock = NULL; > + } > + } > + > if (data[IFLA_GTP_ROLE]) { > role = nla_get_u32(data[IFLA_GTP_ROLE]); > if (role > GTP_ROLE_SGSN) { > - gtp_encap_disable_sock(sk0); > - gtp_encap_disable_sock(sk1u); > + gtp_encap_disable(gtp); > return -EINVAL; > } > } > @@ -1416,7 +1656,7 @@ static int __init gtp_init(void) > if (err < 0) > goto unreg_genl_family; > > - pr_info("GTP module loaded (pdp ctx size %zd bytes)\n", > + pr_info("GTP module loaded (pdp ctx size %zd bytes) with tnl-md support\n", > sizeof(struct pdp_ctx)); > return 0; > > diff --git a/include/uapi/linux/gtp.h b/include/uapi/linux/gtp.h > index 79f9191bbb24..62aff78b7c56 100644 > --- a/include/uapi/linux/gtp.h > +++ b/include/uapi/linux/gtp.h > @@ -2,6 +2,8 @@ > #ifndef _UAPI_LINUX_GTP_H_ > #define _UAPI_LINUX_GTP_H_ > > +#include <linux/types.h> > + > #define GTP_GENL_MCGRP_NAME "gtp" > > enum gtp_genl_cmds { > @@ -34,4 +36,14 @@ enum gtp_attrs { > }; > #define GTPA_MAX (__GTPA_MAX + 1) > > +enum { > + GTP_METADATA_V1 > +}; > + > +struct gtpu_metadata { > + __u8 ver; > + __u8 flags; > + __u8 type; > +}; > + > #endif /* _UAPI_LINUX_GTP_H_ */ > diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h > index 874cc12a34d9..15117fead4b1 100644 > --- a/include/uapi/linux/if_link.h > +++ b/include/uapi/linux/if_link.h > @@ -808,6 +808,7 @@ enum { > IFLA_GTP_FD1, > IFLA_GTP_PDP_HASHSIZE, > IFLA_GTP_ROLE, > + IFLA_GTP_COLLECT_METADATA, > __IFLA_GTP_MAX, > }; > #define IFLA_GTP_MAX (__IFLA_GTP_MAX - 1) > diff --git a/include/uapi/linux/if_tunnel.h b/include/uapi/linux/if_tunnel.h > index 7d9105533c7b..802da679fab1 100644 > --- a/include/uapi/linux/if_tunnel.h > +++ b/include/uapi/linux/if_tunnel.h > @@ -176,6 +176,7 @@ enum { > #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000) > #define TUNNEL_NOCACHE __cpu_to_be16(0x2000) > #define TUNNEL_ERSPAN_OPT __cpu_to_be16(0x4000) > +#define TUNNEL_GTPU_OPT __cpu_to_be16(0x8000) > > #define TUNNEL_OPTIONS_PRESENT \ > (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT | TUNNEL_ERSPAN_OPT) > diff --git a/tools/include/uapi/linux/if_link.h b/tools/include/uapi/linux/if_link.h > index d208b2af697f..28d649bda686 100644 > --- a/tools/include/uapi/linux/if_link.h > +++ b/tools/include/uapi/linux/if_link.h > @@ -617,6 +617,7 @@ enum { > IFLA_GTP_FD1, > IFLA_GTP_PDP_HASHSIZE, > IFLA_GTP_ROLE, > + IFLA_GTP_COLLECT_METADATA, > __IFLA_GTP_MAX, > }; > #define IFLA_GTP_MAX (__IFLA_GTP_MAX - 1)

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osmocom-net-gprs January 2021