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Message-ID: <CAOrHB_BtMHbCbiMKzxOLjLy9tJMcm9VpXSzXaxBZh1uW+MS+wA@mail.gmail.com>
Date: Fri, 11 Dec 2020 20:39:18 -0800
From: Pravin Shelar <pravin.ovn@...il.com>
To: Jonas Bonn <jonas@...rbonn.se>
Cc: Pravin B Shelar <pbshelar@...com>,
Linux Kernel Network Developers <netdev@...r.kernel.org>,
Pablo Neira Ayuso <pablo@...filter.org>, laforge@...monks.org
Subject: Re: [PATCH net-next] GTP: add support for flow based tunneling API
On Fri, Dec 11, 2020 at 6:15 AM Jonas Bonn <jonas@...rbonn.se> wrote:
>
> Hi Pravin,
>
> On 11/12/2020 07:56, Pravin B Shelar wrote:
> > Following patch add support for 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.
>
> This is a big patch that would be well-served to break into a series of
> smaller changes.
>
> I've added some further commentary below...
>
Thanks for the review.
> /Jonas
>
> >
> > Signed-off-by: Pravin B Shelar <pbshelar@...com>
> > ---
> > drivers/net/gtp.c | 541 ++++++++++++++++++++---------
> > include/uapi/linux/gtp.h | 10 +
> > 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, 398 insertions(+), 156 deletions(-)
> >
> > diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
> > index 4c04e271f184..bdb4d7c319be 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 flow based tunnel. */
> > + bool collect_md;
> > + struct socket *collect_md_sock;
> > };
> >
> > static unsigned int gtp_net_id __read_mostly;
> > @@ -151,7 +155,7 @@ static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr)
> > }
> >
> > static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx,
> > - unsigned int hdrlen, unsigned int role)
> > + unsigned int hdrlen, unsigned int role)
>
> This is quite a big patch, so try to keep unnecessary churn out of it in
> order to ease review. These sorts of "cleanups" can be submitted as a
> secondary patch, if necessary.
>
I have removed these changes from this patch. I will post it in a
separate patch.
> > {
> > struct iphdr *iph;
> >
> > @@ -170,7 +174,7 @@ static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx,
> > * existing mobile subscriber.
> > */
> > static bool gtp_check_ms(struct sk_buff *skb, struct pdp_ctx *pctx,
> > - unsigned int hdrlen, unsigned int role)
> > + unsigned int hdrlen, unsigned int role)
>
> Ditto.
>
> > {
> > switch (ntohs(skb->protocol)) {
> > case ETH_P_IP:
> > @@ -179,33 +183,116 @@ 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_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 (!gtp_check_ms(skb, pctx, hdrlen, role)) {
> > - netdev_dbg(pctx->dev, "No PDP ctx for this MS\n");
> > - return 1;
> > - }
> > + int err;
> >
> > - /* 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;
> > + if (ip_tunnel_collect_metadata() || gtp->collect_md) {
> > + struct metadata_dst *tun_dst;
> > + int opts_len = 0;
> > +
> > + if (unlikely(flags & 0x07))
> > + opts_len = sizeof(struct gtpu_metadata);
> >
> > - netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n");
> > + tun_dst =
> > + udp_tun_rx_dst(skb, gtp->sk1u->sk_family, TUNNEL_KEY, tid, opts_len);
>
> You shouldn't assume this is a GTPv1 tunnel. That's why the pctx was
> holding a reference to the correct sk earlier.
>
Flow based GTP socket is associated with GTP_ENCAP_GTP1U. There is a
check for GTP version in gtp1u_udp_encap_recv(), so this code would
only receive GTPv1 packets.
I will have a look at adding support for v0 later. it is tricky due to
the seq number in the header.
> > + if (!tun_dst) {
> > + err = -ENOMEM;
> > + 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 = ip_tunnel_info_opts(&tun_dst->u.tun_info);
> > + struct gtp1_header *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 = 0xffff; /* Unknown */
> > + }
> > + /* Get rid of the GTP + UDP headers. */
> > + err = iptunnel_pull_header(skb, hdrlen, skb->protocol,
> > + !net_eq(sock_net(gtp->sk1u), dev_net(gtp->dev)));
> > + if (err) {
> > + gtp->dev->stats.rx_length_errors++;
> > + goto err;
> > + }
> > +
> > + skb_dst_set(skb, &tun_dst->dst);
> > + } else {
> > + struct pdp_ctx *pctx;
> > +
> > + if (flags & GTP1_F_MASK)
> > + hdrlen += 4;
> > +
> > + if (type != GTP_TPDU)
> > + return 1;
> > +
> > + if (gtp_version == GTP_V0) {
> > + pctx = gtp0_pdp_find(gtp, be64_to_cpu(tid));
> > + if (!pctx) {
> > + netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
> > + return 1;
> > + }
> > + } 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. */
> > + err = iptunnel_pull_header(skb, hdrlen, skb->protocol,
> > + !net_eq(sock_net(pctx->sk), dev_net(gtp->dev)));
> > + if (err) {
> > + 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 err;
> > }
> >
> > /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */
> > @@ -214,7 +301,6 @@ 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 +310,7 @@ 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 +318,30 @@ 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 +381,11 @@ 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 +400,7 @@ 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:
> > @@ -350,7 +421,7 @@ static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb)
> > break;
> > case 0:
> > break;
> > - case -1:
> > + default:
>
> It really is -1, though, right?
>
The function can return error code. But now I have reverted back to -1
to indicate dropped packet.
> > netdev_dbg(gtp->dev, "GTP packet has been dropped\n");
> > kfree_skb(skb);
> > ret = 0;
> > @@ -383,12 +454,13 @@ 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;
> >
> > @@ -400,7 +472,7 @@ static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
> > int payload_len = skb->len;
> > struct gtp0_header *gtp0;
> >
> > - gtp0 = skb_push(skb, sizeof(*gtp0));
> > + gtp0 = (struct gtp0_header *)skb_push(skb, sizeof(*gtp0));
> >
> > gtp0->flags = 0x1e; /* v0, GTP-non-prime. */
> > gtp0->type = GTP_TPDU;
> > @@ -412,12 +484,12 @@ 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;
> >
> > - gtp1 = skb_push(skb, sizeof(*gtp1));
> > + gtp1 = (struct gtp1_header *)skb_push(skb, sizeof(*gtp1));
>
> That cast shouldn't be necessary...
>
ok.
> >
> > /* Bits 8 7 6 5 4 3 2 1
> > * +--+--+--+--+--+--+--+--+
> > @@ -428,89 +500,164 @@ 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 = (struct gtp1_header *)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->rt = rt;
> > - pktinfo->fl4 = *fl4;
> > - pktinfo->dev = dev;
> > + pktinfo->sk = sk;
> > + pktinfo->tos = tos;
> > + pktinfo->rt = rt;
> > + pktinfo->fl4 = *fl4;
> > + pktinfo->dev = dev;
>
> These whitespace changes make the patch difficult to read and
> unnecessarily large. If you must do this, resubmit in a separate patch
> in order to keep real changes easier to spot.
>
reverted.
> > }
> >
> > 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 ip_tunnel_info *info = NULL;
> > + struct sock *sk = NULL;
> > + __be32 tun_id;
> > + __be32 daddr;
> > + __be32 saddr;
> > + u8 gtp_version;
> > int mtu;
> > + __u8 tos;
> > + __be16 df = 0;
> > +
> > + /* flow-based GTP1U encap */
> > + info = skb_tunnel_info(skb);
> > + if (gtp->collect_md) {
> > + if (!info) {
> > + netdev_dbg(dev, "missing tunnel info");
> > + return -ENOENT;
> > + }
> > + if (ntohs(info->key.tp_dst) != GTP1U_PORT) {
> > + netdev_dbg(dev, "unexpect 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;
> >
> > - /* 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 (ntohs(skb->protocol) != ETH_P_IP)
> > + return -EOPNOTSUPP;
> >
> > - if (!pctx) {
> > - netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n",
> > - &iph->daddr);
> > - return -ENOENT;
> > + 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 +665,10 @@ 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 +682,38 @@ 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");
>
> Not sure this is correct. Submit as a separate patch explaining why you
> are making this change.
>
There is no change in functionality, for flow based tunneling, DF flag
is defined in tunnel info. therefore it is using a locally defined
variable.
>
> > 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);
>
> The symmetry between gtp0_* and gtp1_push_header is unnecessarily broken
> here.
>
flow based tunnel does not make use of pctx, the context is coming
from tunnel_info.
>
> > + break;
> > + }
> >
> > return 0;
> > err_rt:
> > @@ -557,7 +724,6 @@ 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 +735,22 @@ 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);
>
> This changes the return value in the case the packet isn't IPv4 which
> might break things for somebody expecting this value.
>
That check is done in gtp_build_skb_ip4() function. no change in return value.
>
> > 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,
> > + false,
>
> You should check the net here, not just assume it's the same. Also, you
> are making a change to the parameter that might break functionality for
> other users; this would be better submitted as a separate patch with an
> explanation for why this is necessary.
>
ok, I will submit a separate patch.
> > + false);
> >
> > return NETDEV_TX_OK;
> > tx_err:
> > @@ -610,6 +766,19 @@ 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 = >p_netdev_ops;
> > @@ -634,7 +803,7 @@ 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 +821,24 @@ 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] || data[IFLA_GTP_FD1]) {
> > + netdev_dbg(dev, "flow based device does not support setting socket");
> > + return -EINVAL;
> > + }
> > + if (gtp_find_flow_based_dev(src_net)) {
> > + netdev_dbg(dev, "flow based device already exist");
> > + return -EBUSY;
> > + }
> > + gtp->collect_md = true;
> > + }
> > +
> > if (!data[IFLA_GTP_PDP_HASHSIZE]) {
> > hashsize = 1024;
> > } else {
> > @@ -669,7 +851,7 @@ 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 +865,7 @@ static int gtp_newlink(struct net *src_net, struct net_device *dev,
> > list_add_rcu(>p->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 +888,7 @@ static void gtp_dellink(struct net_device *dev, struct list_head *head)
> > pdp_context_delete(pctx);
> >
> > list_del_rcu(>p->list);
> > +
> > unregister_netdevice_queue(dev, head);
> > }
> >
> > @@ -714,6 +897,7 @@ 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 +921,9 @@ 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 +969,24 @@ 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 +997,58 @@ 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 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 nlattr *data[])
> > +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 +1072,21 @@ static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[])
> > }
> > }
> >
> > + if (data[IFLA_GTP_COLLECT_METADATA]) {
> > + struct socket *sock;
> > +
> > + sock = gtp_create_gtp_socket(gtp, dev);
> > + if (IS_ERR(sock))
> > + return PTR_ERR(sock);
> > +
> > + gtp->collect_md_sock = sock;
> > + sk1u = sock->sk;
>
> This kind of breaks the userspace API... what happens to the sk1u that
> the user passes in? I think if it's not NULL, this needs to error out.
>
It is not supported, gtp_newlink() rejects create requests if any of
FD is passed for flow based tunneling device.
> > + }
> > +
> > 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 +1645,7 @@ 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..b1498049d6e6 100644
> > --- a/include/uapi/linux/gtp.h
> > +++ b/include/uapi/linux/gtp.h
> > @@ -34,4 +34,14 @@ 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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