Merging upstream version 6.10.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 735 insertions, 130 deletions

diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index e62d6cbdf9..427b91aca5 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -24,6 +24,7 @@
 #include <net/net_namespace.h>
 #include <net/protocol.h>
 #include <net/ip.h>
+#include <net/ipv6.h>
 #include <net/udp.h>
 #include <net/udp_tunnel.h>
 #include <net/icmp.h>
@@ -50,8 +51,14 @@ struct pdp_ctx {
 	u8			gtp_version;
 	u16			af;
 
-	struct in_addr		ms_addr_ip4;
-	struct in_addr		peer_addr_ip4;
+	union {
+		struct in_addr	addr;
+		struct in6_addr	addr6;
+	} ms;
+	union {
+		struct in_addr	addr;
+		struct in6_addr	addr6;
+	} peer;
 
 	struct sock		*sk;
 	struct net_device       *dev;
@@ -80,9 +87,15 @@ struct gtp_dev {
 };
 
 struct echo_info {
-	struct in_addr		ms_addr_ip4;
-	struct in_addr		peer_addr_ip4;
+	u16			af;
 	u8			gtp_version;
+
+	union {
+		struct in_addr	addr;
+	} ms;
+	union {
+		struct in_addr	addr;
+	} peer;
 };
 
 static unsigned int gtp_net_id __read_mostly;
@@ -121,8 +134,14 @@ static inline u32 ipv4_hashfn(__be32 ip)
 	return jhash_1word((__force u32)ip, gtp_h_initval);
 }
 
+static u32 ipv6_hashfn(const struct in6_addr *ip6)
+{
+	return jhash_2words((__force u32)ip6->s6_addr32[0],
+			    (__force u32)ip6->s6_addr32[1], gtp_h_initval);
+}
+
 /* Resolve a PDP context structure based on the 64bit TID. */
-static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid)
+static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid, u16 family)
 {
 	struct hlist_head *head;
 	struct pdp_ctx *pdp;
@@ -130,7 +149,8 @@ static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid)
 	head = &gtp->tid_hash[gtp0_hashfn(tid) % gtp->hash_size];
 
 	hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
-		if (pdp->gtp_version == GTP_V0 &&
+		if (pdp->af == family &&
+		    pdp->gtp_version == GTP_V0 &&
 		    pdp->u.v0.tid == tid)
 			return pdp;
 	}
@@ -138,7 +158,7 @@ static struct pdp_ctx *gtp0_pdp_find(struct gtp_dev *gtp, u64 tid)
 }
 
 /* Resolve a PDP context structure based on the 32bit TEI. */
-static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid)
+static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid, u16 family)
 {
 	struct hlist_head *head;
 	struct pdp_ctx *pdp;
@@ -146,7 +166,8 @@ static struct pdp_ctx *gtp1_pdp_find(struct gtp_dev *gtp, u32 tid)
 	head = &gtp->tid_hash[gtp1u_hashfn(tid) % gtp->hash_size];
 
 	hlist_for_each_entry_rcu(pdp, head, hlist_tid) {
-		if (pdp->gtp_version == GTP_V1 &&
+		if (pdp->af == family &&
+		    pdp->gtp_version == GTP_V1 &&
 		    pdp->u.v1.i_tei == tid)
 			return pdp;
 	}
@@ -163,7 +184,42 @@ static struct pdp_ctx *ipv4_pdp_find(struct gtp_dev *gtp, __be32 ms_addr)
 
 	hlist_for_each_entry_rcu(pdp, head, hlist_addr) {
 		if (pdp->af == AF_INET &&
-		    pdp->ms_addr_ip4.s_addr == ms_addr)
+		    pdp->ms.addr.s_addr == ms_addr)
+			return pdp;
+	}
+
+	return NULL;
+}
+
+/* 3GPP TS 29.060: PDN Connection: the association between a MS represented by
+ * [...] one IPv6 *prefix* and a PDN represented by an APN.
+ *
+ * Then, 3GPP TS 29.061, Section 11.2.1.3 says: The size of the prefix shall be
+ * according to the maximum prefix length for a global IPv6 address as
+ * specified in the IPv6 Addressing Architecture, see RFC 4291.
+ *
+ * Finally, RFC 4291 section 2.5.4 states: All Global Unicast addresses other
+ * than those that start with binary 000 have a 64-bit interface ID field
+ * (i.e., n + m = 64).
+ */
+static bool ipv6_pdp_addr_equal(const struct in6_addr *a,
+				const struct in6_addr *b)
+{
+	return a->s6_addr32[0] == b->s6_addr32[0] &&
+	       a->s6_addr32[1] == b->s6_addr32[1];
+}
+
+static struct pdp_ctx *ipv6_pdp_find(struct gtp_dev *gtp,
+				     const struct in6_addr *ms_addr)
+{
+	struct hlist_head *head;
+	struct pdp_ctx *pdp;
+
+	head = &gtp->addr_hash[ipv6_hashfn(ms_addr) % gtp->hash_size];
+
+	hlist_for_each_entry_rcu(pdp, head, hlist_addr) {
+		if (pdp->af == AF_INET6 &&
+		    ipv6_pdp_addr_equal(&pdp->ms.addr6, ms_addr))
 			return pdp;
 	}
 
@@ -181,34 +237,85 @@ static bool gtp_check_ms_ipv4(struct sk_buff *skb, struct pdp_ctx *pctx,
 	iph = (struct iphdr *)(skb->data + hdrlen);
 
 	if (role == GTP_ROLE_SGSN)
-		return iph->daddr == pctx->ms_addr_ip4.s_addr;
+		return iph->daddr == pctx->ms.addr.s_addr;
 	else
-		return iph->saddr == pctx->ms_addr_ip4.s_addr;
+		return iph->saddr == pctx->ms.addr.s_addr;
+}
+
+static bool gtp_check_ms_ipv6(struct sk_buff *skb, struct pdp_ctx *pctx,
+			      unsigned int hdrlen, unsigned int role)
+{
+	struct ipv6hdr *ip6h;
+	int ret;
+
+	if (!pskb_may_pull(skb, hdrlen + sizeof(struct ipv6hdr)))
+		return false;
+
+	ip6h = (struct ipv6hdr *)(skb->data + hdrlen);
+
+	if ((ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL) ||
+	    (ipv6_addr_type(&ip6h->daddr) & IPV6_ADDR_LINKLOCAL))
+		return false;
+
+	if (role == GTP_ROLE_SGSN) {
+		ret = ipv6_pdp_addr_equal(&ip6h->daddr, &pctx->ms.addr6);
+	} else {
+		ret = ipv6_pdp_addr_equal(&ip6h->saddr, &pctx->ms.addr6);
+	}
+
+	return ret;
 }
 
 /* Check if the inner IP address in this packet is assigned to any
  * 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,
+			 __u16 inner_proto)
 {
-	switch (ntohs(skb->protocol)) {
+	switch (inner_proto) {
 	case ETH_P_IP:
 		return gtp_check_ms_ipv4(skb, pctx, hdrlen, role);
+	case ETH_P_IPV6:
+		return gtp_check_ms_ipv6(skb, pctx, hdrlen, role);
 	}
 	return false;
 }
 
+static int gtp_inner_proto(struct sk_buff *skb, unsigned int hdrlen,
+			   __u16 *inner_proto)
+{
+	__u8 *ip_version, _ip_version;
+
+	ip_version = skb_header_pointer(skb, hdrlen, sizeof(*ip_version),
+					&_ip_version);
+	if (!ip_version)
+		return -1;
+
+	switch (*ip_version & 0xf0) {
+	case 0x40:
+		*inner_proto = ETH_P_IP;
+		break;
+	case 0x60:
+		*inner_proto = ETH_P_IPV6;
+		break;
+	default:
+		return -1;
+	}
+
+	return 0;
+}
+
 static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb,
-			unsigned int hdrlen, unsigned int role)
+		  unsigned int hdrlen, unsigned int role, __u16 inner_proto)
 {
-	if (!gtp_check_ms(skb, pctx, hdrlen, role)) {
+	if (!gtp_check_ms(skb, pctx, hdrlen, role, inner_proto)) {
 		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,
+	if (iptunnel_pull_header(skb, hdrlen, htons(inner_proto),
 			 !net_eq(sock_net(pctx->sk), dev_net(pctx->dev)))) {
 		pctx->dev->stats.rx_length_errors++;
 		goto err;
@@ -250,6 +357,27 @@ static struct rtable *ip4_route_output_gtp(struct flowi4 *fl4,
 	return ip_route_output_key(sock_net(sk), fl4);
 }
 
+static struct rt6_info *ip6_route_output_gtp(struct net *net,
+					     struct flowi6 *fl6,
+					     const struct sock *sk,
+					     const struct in6_addr *daddr,
+					     struct in6_addr *saddr)
+{
+	struct dst_entry *dst;
+
+	memset(fl6, 0, sizeof(*fl6));
+	fl6->flowi6_oif		= sk->sk_bound_dev_if;
+	fl6->daddr		= *daddr;
+	fl6->saddr		= *saddr;
+	fl6->flowi6_proto	= sk->sk_protocol;
+
+	dst = ipv6_stub->ipv6_dst_lookup_flow(net, sk, fl6, NULL);
+	if (IS_ERR(dst))
+		return ERR_PTR(-ENETUNREACH);
+
+	return (struct rt6_info *)dst;
+}
+
 /* GSM TS 09.60. 7.3
  * In all Path Management messages:
  * - TID: is not used and shall be set to 0.
@@ -292,13 +420,39 @@ static void gtp0_build_echo_msg(struct gtp0_header *hdr, __u8 msg_type)
 		hdr->length = 0;
 }
 
+static int gtp0_send_echo_resp_ip(struct gtp_dev *gtp, struct sk_buff *skb)
+{
+	struct iphdr *iph = ip_hdr(skb);
+	struct flowi4 fl4;
+	struct rtable *rt;
+
+	/* find route to the sender,
+	 * src address becomes dst address and vice versa.
+	 */
+	rt = ip4_route_output_gtp(&fl4, gtp->sk0, iph->saddr, iph->daddr);
+	if (IS_ERR(rt)) {
+		netdev_dbg(gtp->dev, "no route for echo response from %pI4\n",
+			   &iph->saddr);
+		return -1;
+	}
+
+	udp_tunnel_xmit_skb(rt, gtp->sk0, skb,
+			    fl4.saddr, fl4.daddr,
+			    iph->tos,
+			    ip4_dst_hoplimit(&rt->dst),
+			    0,
+			    htons(GTP0_PORT), htons(GTP0_PORT),
+			    !net_eq(sock_net(gtp->sk1u),
+				    dev_net(gtp->dev)),
+			    false);
+
+	return 0;
+}
+
 static int gtp0_send_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb)
 {
 	struct gtp0_packet *gtp_pkt;
 	struct gtp0_header *gtp0;
-	struct rtable *rt;
-	struct flowi4 fl4;
-	struct iphdr *iph;
 	__be16 seq;
 
 	gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));
@@ -325,27 +479,15 @@ static int gtp0_send_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb)
 	gtp_pkt->ie.tag = GTPIE_RECOVERY;
 	gtp_pkt->ie.val = gtp->restart_count;
 
-	iph = ip_hdr(skb);
-
-	/* find route to the sender,
-	 * src address becomes dst address and vice versa.
-	 */
-	rt = ip4_route_output_gtp(&fl4, gtp->sk0, iph->saddr, iph->daddr);
-	if (IS_ERR(rt)) {
-		netdev_dbg(gtp->dev, "no route for echo response from %pI4\n",
-			   &iph->saddr);
+	switch (gtp->sk0->sk_family) {
+	case AF_INET:
+		if (gtp0_send_echo_resp_ip(gtp, skb) < 0)
+			return -1;
+		break;
+	case AF_INET6:
 		return -1;
 	}
 
-	udp_tunnel_xmit_skb(rt, gtp->sk0, skb,
-			    fl4.saddr, fl4.daddr,
-			    iph->tos,
-			    ip4_dst_hoplimit(&rt->dst),
-			    0,
-			    htons(GTP0_PORT), htons(GTP0_PORT),
-			    !net_eq(sock_net(gtp->sk1u),
-				    dev_net(gtp->dev)),
-			    false);
 	return 0;
 }
 
@@ -360,8 +502,8 @@ static int gtp_genl_fill_echo(struct sk_buff *skb, u32 snd_portid, u32 snd_seq,
 		goto failure;
 
 	if (nla_put_u32(skb, GTPA_VERSION, echo.gtp_version) ||
-	    nla_put_be32(skb, GTPA_PEER_ADDRESS, echo.peer_addr_ip4.s_addr) ||
-	    nla_put_be32(skb, GTPA_MS_ADDRESS, echo.ms_addr_ip4.s_addr))
+	    nla_put_be32(skb, GTPA_PEER_ADDRESS, echo.peer.addr.s_addr) ||
+	    nla_put_be32(skb, GTPA_MS_ADDRESS, echo.ms.addr.s_addr))
 		goto failure;
 
 	genlmsg_end(skb, genlh);
@@ -372,12 +514,20 @@ failure:
 	return -EMSGSIZE;
 }
 
+static void gtp0_handle_echo_resp_ip(struct sk_buff *skb, struct echo_info *echo)
+{
+	struct iphdr *iph = ip_hdr(skb);
+
+	echo->ms.addr.s_addr = iph->daddr;
+	echo->peer.addr.s_addr = iph->saddr;
+	echo->gtp_version = GTP_V0;
+}
+
 static int gtp0_handle_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb)
 {
 	struct gtp0_header *gtp0;
 	struct echo_info echo;
 	struct sk_buff *msg;
-	struct iphdr *iph;
 	int ret;
 
 	gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));
@@ -385,10 +535,13 @@ static int gtp0_handle_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb)
 	if (!gtp0_validate_echo_hdr(gtp0))
 		return -1;
 
-	iph = ip_hdr(skb);
-	echo.ms_addr_ip4.s_addr = iph->daddr;
-	echo.peer_addr_ip4.s_addr = iph->saddr;
-	echo.gtp_version = GTP_V0;
+	switch (gtp->sk0->sk_family) {
+	case AF_INET:
+		gtp0_handle_echo_resp_ip(skb, &echo);
+		break;
+	case AF_INET6:
+		return -1;
+	}
 
 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 	if (!msg)
@@ -404,6 +557,21 @@ static int gtp0_handle_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb)
 				       msg, 0, GTP_GENL_MCGRP, GFP_ATOMIC);
 }
 
+static int gtp_proto_to_family(__u16 proto)
+{
+	switch (proto) {
+	case ETH_P_IP:
+		return AF_INET;
+	case ETH_P_IPV6:
+		return AF_INET6;
+	default:
+		WARN_ON_ONCE(1);
+		break;
+	}
+
+	return AF_UNSPEC;
+}
+
 /* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */
 static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
 {
@@ -411,6 +579,7 @@ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
 			      sizeof(struct gtp0_header);
 	struct gtp0_header *gtp0;
 	struct pdp_ctx *pctx;
+	__u16 inner_proto;
 
 	if (!pskb_may_pull(skb, hdrlen))
 		return -1;
@@ -433,13 +602,19 @@ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
 	if (gtp0->type != GTP_TPDU)
 		return 1;
 
-	pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid));
+	if (gtp_inner_proto(skb, hdrlen, &inner_proto) < 0) {
+		netdev_dbg(gtp->dev, "GTP packet does not encapsulate an IP packet\n");
+		return -1;
+	}
+
+	pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid),
+			     gtp_proto_to_family(inner_proto));
 	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(pctx, skb, hdrlen, gtp->role, inner_proto);
 }
 
 /* msg_type has to be GTP_ECHO_REQ or GTP_ECHO_RSP */
@@ -549,8 +724,8 @@ static int gtp1u_handle_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb)
 		return -1;
 
 	iph = ip_hdr(skb);
-	echo.ms_addr_ip4.s_addr = iph->daddr;
-	echo.peer_addr_ip4.s_addr = iph->saddr;
+	echo.ms.addr.s_addr = iph->daddr;
+	echo.peer.addr.s_addr = iph->saddr;
 	echo.gtp_version = GTP_V1;
 
 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
@@ -567,12 +742,50 @@ static int gtp1u_handle_echo_resp(struct gtp_dev *gtp, struct sk_buff *skb)
 				       msg, 0, GTP_GENL_MCGRP, GFP_ATOMIC);
 }
 
+static int gtp_parse_exthdrs(struct sk_buff *skb, unsigned int *hdrlen)
+{
+	struct gtp_ext_hdr *gtp_exthdr, _gtp_exthdr;
+	unsigned int offset = *hdrlen;
+	__u8 *next_type, _next_type;
+
+	/* From 29.060: "The Extension Header Length field specifies the length
+	 * of the particular Extension header in 4 octets units."
+	 *
+	 * This length field includes length field size itself (1 byte),
+	 * payload (variable length) and next type (1 byte). The extension
+	 * header is aligned to to 4 bytes.
+	 */
+
+	do {
+		gtp_exthdr = skb_header_pointer(skb, offset, sizeof(*gtp_exthdr),
+						&_gtp_exthdr);
+		if (!gtp_exthdr || !gtp_exthdr->len)
+			return -1;
+
+		offset += gtp_exthdr->len * 4;
+
+		/* From 29.060: "If no such Header follows, then the value of
+		 * the Next Extension Header Type shall be 0."
+		 */
+		next_type = skb_header_pointer(skb, offset - 1,
+					       sizeof(_next_type), &_next_type);
+		if (!next_type)
+			return -1;
+
+	} while (*next_type != 0);
+
+	*hdrlen = offset;
+
+	return 0;
+}
+
 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;
+	__u16 inner_proto;
 
 	if (!pskb_may_pull(skb, hdrlen))
 		return -1;
@@ -608,15 +821,25 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb)
 	if (!pskb_may_pull(skb, hdrlen))
 		return -1;
 
+	if (gtp_inner_proto(skb, hdrlen, &inner_proto) < 0) {
+		netdev_dbg(gtp->dev, "GTP packet does not encapsulate an IP packet\n");
+		return -1;
+	}
+
 	gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
 
-	pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
+	pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid),
+			     gtp_proto_to_family(inner_proto));
 	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);
+	if (gtp1->flags & GTP1_F_EXTHDR &&
+	    gtp_parse_exthdrs(skb, &hdrlen) < 0)
+		return -1;
+
+	return gtp_rx(pctx, skb, hdrlen, gtp->role, inner_proto);
 }
 
 static void __gtp_encap_destroy(struct sock *sk)
@@ -760,11 +983,17 @@ static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
 
 struct gtp_pktinfo {
 	struct sock		*sk;
-	struct iphdr		*iph;
-	struct flowi4		fl4;
-	struct rtable		*rt;
+	union {
+		struct flowi4	fl4;
+		struct flowi6	fl6;
+	};
+	union {
+		struct rtable	*rt;
+		struct rt6_info	*rt6;
+	};
 	struct pdp_ctx		*pctx;
 	struct net_device	*dev;
+	__u8			tos;
 	__be16			gtph_port;
 };
 
@@ -783,64 +1012,61 @@ static void gtp_push_header(struct sk_buff *skb, struct gtp_pktinfo *pktinfo)
 }
 
 static inline void gtp_set_pktinfo_ipv4(struct gtp_pktinfo *pktinfo,
-					struct sock *sk, struct iphdr *iph,
+					struct sock *sk, __u8 tos,
 					struct pdp_ctx *pctx, struct rtable *rt,
 					struct flowi4 *fl4,
 					struct net_device *dev)
 {
 	pktinfo->sk	= sk;
-	pktinfo->iph	= iph;
+	pktinfo->tos	= tos;
 	pktinfo->pctx	= pctx;
 	pktinfo->rt	= rt;
 	pktinfo->fl4	= *fl4;
 	pktinfo->dev	= dev;
 }
 
-static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
-			     struct gtp_pktinfo *pktinfo)
+static void gtp_set_pktinfo_ipv6(struct gtp_pktinfo *pktinfo,
+				 struct sock *sk, __u8 tos,
+				 struct pdp_ctx *pctx, struct rt6_info *rt6,
+				 struct flowi6 *fl6,
+				 struct net_device *dev)
+{
+	pktinfo->sk	= sk;
+	pktinfo->tos	= tos;
+	pktinfo->pctx	= pctx;
+	pktinfo->rt6	= rt6;
+	pktinfo->fl6	= *fl6;
+	pktinfo->dev	= dev;
+}
+
+static int gtp_build_skb_outer_ip4(struct sk_buff *skb, struct net_device *dev,
+				   struct gtp_pktinfo *pktinfo,
+				   struct pdp_ctx *pctx, __u8 tos,
+				   __be16 frag_off)
 {
-	struct gtp_dev *gtp = netdev_priv(dev);
-	struct pdp_ctx *pctx;
 	struct rtable *rt;
 	struct flowi4 fl4;
-	struct iphdr *iph;
 	__be16 df;
 	int mtu;
 
-	/* 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 (!pctx) {
-		netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n",
-			   &iph->daddr);
-		return -ENOENT;
-	}
-	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, pctx->sk, pctx->peer.addr.s_addr,
 				  inet_sk(pctx->sk)->inet_saddr);
 	if (IS_ERR(rt)) {
 		netdev_dbg(dev, "no route to SSGN %pI4\n",
-			   &pctx->peer_addr_ip4.s_addr);
+			   &pctx->peer.addr.s_addr);
 		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);
+			   &pctx->peer.addr.s_addr);
 		dev->stats.collisions++;
 		goto err_rt;
 	}
 
 	/* This is similar to tnl_update_pmtu(). */
-	df = iph->frag_off;
+	df = frag_off;
 	if (df) {
 		mtu = dst_mtu(&rt->dst) - dev->hard_header_len -
 			sizeof(struct iphdr) - sizeof(struct udphdr);
@@ -858,7 +1084,7 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
 
 	skb_dst_update_pmtu_no_confirm(skb, mtu);
 
-	if (iph->frag_off & htons(IP_DF) &&
+	if (frag_off & htons(IP_DF) &&
 	    ((!skb_is_gso(skb) && skb->len > mtu) ||
 	     (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu)))) {
 		netdev_dbg(dev, "packet too big, fragmentation needed\n");
@@ -867,7 +1093,7 @@ static int gtp_build_skb_ip4(struct sk_buff *skb, struct net_device *dev,
 		goto err_rt;
 	}
 
-	gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, iph, pctx, rt, &fl4, dev);
+	gtp_set_pktinfo_ipv4(pktinfo, pctx->sk, tos, pctx, rt, &fl4, dev);
 	gtp_push_header(skb, pktinfo);
 
 	return 0;
@@ -877,6 +1103,162 @@ err:
 	return -EBADMSG;
 }
 
+static int gtp_build_skb_outer_ip6(struct net *net, struct sk_buff *skb,
+				   struct net_device *dev,
+				   struct gtp_pktinfo *pktinfo,
+				   struct pdp_ctx *pctx, __u8 tos)
+{
+	struct dst_entry *dst;
+	struct rt6_info *rt;
+	struct flowi6 fl6;
+	int mtu;
+
+	rt = ip6_route_output_gtp(net, &fl6, pctx->sk, &pctx->peer.addr6,
+				  &inet6_sk(pctx->sk)->saddr);
+	if (IS_ERR(rt)) {
+		netdev_dbg(dev, "no route to SSGN %pI6\n",
+			   &pctx->peer.addr6);
+		dev->stats.tx_carrier_errors++;
+		goto err;
+	}
+	dst = &rt->dst;
+
+	if (rt->dst.dev == dev) {
+		netdev_dbg(dev, "circular route to SSGN %pI6\n",
+			   &pctx->peer.addr6);
+		dev->stats.collisions++;
+		goto err_rt;
+	}
+
+	mtu = dst_mtu(&rt->dst) - dev->hard_header_len -
+		sizeof(struct ipv6hdr) - sizeof(struct udphdr);
+	switch (pctx->gtp_version) {
+	case GTP_V0:
+		mtu -= sizeof(struct gtp0_header);
+		break;
+	case GTP_V1:
+		mtu -= sizeof(struct gtp1_header);
+		break;
+	}
+
+	skb_dst_update_pmtu_no_confirm(skb, mtu);
+
+	if ((!skb_is_gso(skb) && skb->len > mtu) ||
+	    (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu))) {
+		netdev_dbg(dev, "packet too big, fragmentation needed\n");
+		icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+		goto err_rt;
+	}
+
+	gtp_set_pktinfo_ipv6(pktinfo, pctx->sk, tos, pctx, rt, &fl6, dev);
+	gtp_push_header(skb, pktinfo);
+
+	return 0;
+err_rt:
+	dst_release(dst);
+err:
+	return -EBADMSG;
+}
+
+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 net *net = gtp->net;
+	struct pdp_ctx *pctx;
+	struct iphdr *iph;
+	int ret;
+
+	/* 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 (!pctx) {
+		netdev_dbg(dev, "no PDP ctx found for %pI4, skip\n",
+			   &iph->daddr);
+		return -ENOENT;
+	}
+	netdev_dbg(dev, "found PDP context %p\n", pctx);
+
+	switch (pctx->sk->sk_family) {
+	case AF_INET:
+		ret = gtp_build_skb_outer_ip4(skb, dev, pktinfo, pctx,
+					      iph->tos, iph->frag_off);
+		break;
+	case AF_INET6:
+		ret = gtp_build_skb_outer_ip6(net, skb, dev, pktinfo, pctx,
+					      iph->tos);
+		break;
+	default:
+		ret = -1;
+		WARN_ON_ONCE(1);
+		break;
+	}
+
+	if (ret < 0)
+		return ret;
+
+	netdev_dbg(dev, "gtp -> IP src: %pI4 dst: %pI4\n",
+		   &iph->saddr, &iph->daddr);
+
+	return 0;
+}
+
+static int gtp_build_skb_ip6(struct sk_buff *skb, struct net_device *dev,
+			     struct gtp_pktinfo *pktinfo)
+{
+	struct gtp_dev *gtp = netdev_priv(dev);
+	struct net *net = gtp->net;
+	struct pdp_ctx *pctx;
+	struct ipv6hdr *ip6h;
+	__u8 tos;
+	int ret;
+
+	/* Read the IP destination address and resolve the PDP context.
+	 * Prepend PDP header with TEI/TID from PDP ctx.
+	 */
+	ip6h = ipv6_hdr(skb);
+	if (gtp->role == GTP_ROLE_SGSN)
+		pctx = ipv6_pdp_find(gtp, &ip6h->saddr);
+	else
+		pctx = ipv6_pdp_find(gtp, &ip6h->daddr);
+
+	if (!pctx) {
+		netdev_dbg(dev, "no PDP ctx found for %pI6, skip\n",
+			   &ip6h->daddr);
+		return -ENOENT;
+	}
+	netdev_dbg(dev, "found PDP context %p\n", pctx);
+
+	tos = ipv6_get_dsfield(ip6h);
+
+	switch (pctx->sk->sk_family) {
+	case AF_INET:
+		ret = gtp_build_skb_outer_ip4(skb, dev, pktinfo, pctx, tos, 0);
+		break;
+	case AF_INET6:
+		ret = gtp_build_skb_outer_ip6(net, skb, dev, pktinfo, pctx, tos);
+		break;
+	default:
+		ret = -1;
+		WARN_ON_ONCE(1);
+		break;
+	}
+
+	if (ret < 0)
+		return ret;
+
+	netdev_dbg(dev, "gtp -> IP src: %pI6 dst: %pI6\n",
+		   &ip6h->saddr, &ip6h->daddr);
+
+	return 0;
+}
+
 static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	unsigned int proto = ntohs(skb->protocol);
@@ -895,6 +1277,9 @@ static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 	case ETH_P_IP:
 		err = gtp_build_skb_ip4(skb, dev, &pktinfo);
 		break;
+	case ETH_P_IPV6:
+		err = gtp_build_skb_ip6(skb, dev, &pktinfo);
+		break;
 	default:
 		err = -EOPNOTSUPP;
 		break;
@@ -904,13 +1289,11 @@ static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 	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);
+	switch (pktinfo.pctx->sk->sk_family) {
+	case AF_INET:
 		udp_tunnel_xmit_skb(pktinfo.rt, pktinfo.sk, skb,
 				    pktinfo.fl4.saddr, pktinfo.fl4.daddr,
-				    pktinfo.iph->tos,
+				    pktinfo.tos,
 				    ip4_dst_hoplimit(&pktinfo.rt->dst),
 				    0,
 				    pktinfo.gtph_port, pktinfo.gtph_port,
@@ -918,6 +1301,19 @@ static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 					    dev_net(dev)),
 				    false);
 		break;
+	case AF_INET6:
+#if IS_ENABLED(CONFIG_IPV6)
+		udp_tunnel6_xmit_skb(&pktinfo.rt6->dst, pktinfo.sk, skb, dev,
+				     &pktinfo.fl6.saddr, &pktinfo.fl6.daddr,
+				     pktinfo.tos,
+				     ip6_dst_hoplimit(&pktinfo.rt->dst),
+				     0,
+				     pktinfo.gtph_port, pktinfo.gtph_port,
+				     false);
+#else
+		goto tx_err;
+#endif
+		break;
 	}
 
 	return NETDEV_TX_OK;
@@ -936,11 +1332,11 @@ static const struct device_type gtp_type = {
 	.name = "gtp",
 };
 
+#define GTP_TH_MAXLEN	(sizeof(struct udphdr) + sizeof(struct gtp0_header))
+#define GTP_IPV4_MAXLEN	(sizeof(struct iphdr) + GTP_TH_MAXLEN)
+
 static void gtp_link_setup(struct net_device *dev)
 {
-	unsigned int max_gtp_header_len = sizeof(struct iphdr) +
-					  sizeof(struct udphdr) +
-					  sizeof(struct gtp0_header);
 	struct gtp_dev *gtp = netdev_priv(dev);
 
 	dev->netdev_ops		= &gtp_netdev_ops;
@@ -949,7 +1345,7 @@ static void gtp_link_setup(struct net_device *dev)
 
 	dev->hard_header_len = 0;
 	dev->addr_len = 0;
-	dev->mtu = ETH_DATA_LEN - max_gtp_header_len;
+	dev->mtu = ETH_DATA_LEN - GTP_IPV4_MAXLEN;
 
 	/* Zero header length. */
 	dev->type = ARPHRD_NONE;
@@ -960,7 +1356,7 @@ static void gtp_link_setup(struct net_device *dev)
 	dev->features	|= NETIF_F_LLTX;
 	netif_keep_dst(dev);
 
-	dev->needed_headroom	= LL_MAX_HEADER + max_gtp_header_len;
+	dev->needed_headroom	= LL_MAX_HEADER + GTP_IPV4_MAXLEN;
 	gtp->dev = dev;
 }
 
@@ -975,17 +1371,45 @@ static void gtp_destructor(struct net_device *dev)
 	kfree(gtp->tid_hash);
 }
 
-static struct sock *gtp_create_sock(int type, struct gtp_dev *gtp)
+static int gtp_sock_udp_config(struct udp_port_cfg *udp_conf,
+			       const struct nlattr *nla, int family)
+{
+	udp_conf->family = family;
+
+	switch (udp_conf->family) {
+	case AF_INET:
+		udp_conf->local_ip.s_addr = nla_get_be32(nla);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		udp_conf->local_ip6 = nla_get_in6_addr(nla);
+		break;
+#endif
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static struct sock *gtp_create_sock(int type, struct gtp_dev *gtp,
+				    const struct nlattr *nla, int family)
 {
 	struct udp_tunnel_sock_cfg tuncfg = {};
-	struct udp_port_cfg udp_conf = {
-		.local_ip.s_addr	= htonl(INADDR_ANY),
-		.family			= AF_INET,
-	};
+	struct udp_port_cfg udp_conf = {};
 	struct net *net = gtp->net;
 	struct socket *sock;
 	int err;
 
+	if (nla) {
+		err = gtp_sock_udp_config(&udp_conf, nla, family);
+		if (err < 0)
+			return ERR_PTR(err);
+	} else {
+		udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
+		udp_conf.family = AF_INET;
+	}
+
 	if (type == UDP_ENCAP_GTP0)
 		udp_conf.local_udp_port = htons(GTP0_PORT);
 	else if (type == UDP_ENCAP_GTP1U)
@@ -1007,16 +1431,17 @@ static struct sock *gtp_create_sock(int type, struct gtp_dev *gtp)
 	return sock->sk;
 }
 
-static int gtp_create_sockets(struct gtp_dev *gtp, struct nlattr *data[])
+static int gtp_create_sockets(struct gtp_dev *gtp, const struct nlattr *nla,
+			      int family)
 {
-	struct sock *sk1u = NULL;
-	struct sock *sk0 = NULL;
+	struct sock *sk1u;
+	struct sock *sk0;
 
-	sk0 = gtp_create_sock(UDP_ENCAP_GTP0, gtp);
+	sk0 = gtp_create_sock(UDP_ENCAP_GTP0, gtp, nla, family);
 	if (IS_ERR(sk0))
 		return PTR_ERR(sk0);
 
-	sk1u = gtp_create_sock(UDP_ENCAP_GTP1U, gtp);
+	sk1u = gtp_create_sock(UDP_ENCAP_GTP1U, gtp, nla, family);
 	if (IS_ERR(sk1u)) {
 		udp_tunnel_sock_release(sk0->sk_socket);
 		return PTR_ERR(sk1u);
@@ -1029,6 +1454,9 @@ static int gtp_create_sockets(struct gtp_dev *gtp, struct nlattr *data[])
 	return 0;
 }
 
+#define GTP_TH_MAXLEN	(sizeof(struct udphdr) + sizeof(struct gtp0_header))
+#define GTP_IPV6_MAXLEN	(sizeof(struct ipv6hdr) + GTP_TH_MAXLEN)
+
 static int gtp_newlink(struct net *src_net, struct net_device *dev,
 		       struct nlattr *tb[], struct nlattr *data[],
 		       struct netlink_ext_ack *extack)
@@ -1038,6 +1466,11 @@ static int gtp_newlink(struct net *src_net, struct net_device *dev,
 	struct gtp_net *gn;
 	int hashsize, err;
 
+#if !IS_ENABLED(CONFIG_IPV6)
+	if (data[IFLA_GTP_LOCAL6])
+		return -EAFNOSUPPORT;
+#endif
+
 	gtp = netdev_priv(dev);
 
 	if (!data[IFLA_GTP_PDP_HASHSIZE]) {
@@ -1066,13 +1499,24 @@ static int gtp_newlink(struct net *src_net, struct net_device *dev,
 	if (err < 0)
 		return err;
 
-	if (data[IFLA_GTP_CREATE_SOCKETS])
-		err = gtp_create_sockets(gtp, data);
-	else
+	if (data[IFLA_GTP_CREATE_SOCKETS]) {
+		if (data[IFLA_GTP_LOCAL6])
+			err = gtp_create_sockets(gtp, data[IFLA_GTP_LOCAL6], AF_INET6);
+		else
+			err = gtp_create_sockets(gtp, data[IFLA_GTP_LOCAL], AF_INET);
+	} else {
 		err = gtp_encap_enable(gtp, data);
+	}
+
 	if (err < 0)
 		goto out_hashtable;
 
+	if ((gtp->sk0 && gtp->sk0->sk_family == AF_INET6) ||
+	    (gtp->sk1u && gtp->sk1u->sk_family == AF_INET6)) {
+		dev->mtu = ETH_DATA_LEN - GTP_IPV6_MAXLEN;
+		dev->needed_headroom = LL_MAX_HEADER + GTP_IPV6_MAXLEN;
+	}
+
 	err = register_netdevice(dev);
 	if (err < 0) {
 		netdev_dbg(dev, "failed to register new netdev %d\n", err);
@@ -1117,6 +1561,8 @@ static const struct nla_policy gtp_policy[IFLA_GTP_MAX + 1] = {
 	[IFLA_GTP_ROLE]			= { .type = NLA_U32 },
 	[IFLA_GTP_CREATE_SOCKETS]	= { .type = NLA_U8 },
 	[IFLA_GTP_RESTART_COUNT]	= { .type = NLA_U8 },
+	[IFLA_GTP_LOCAL]		= { .type = NLA_U32 },
+	[IFLA_GTP_LOCAL6]		= { .len = sizeof(struct in6_addr) },
 };
 
 static int gtp_validate(struct nlattr *tb[], struct nlattr *data[],
@@ -1216,6 +1662,12 @@ static struct sock *gtp_encap_enable_socket(int fd, int type,
 		goto out_sock;
 	}
 
+	if (sk->sk_family == AF_INET6 &&
+	    !sk->sk_ipv6only) {
+		sk = ERR_PTR(-EADDRNOTAVAIL);
+		goto out_sock;
+	}
+
 	lock_sock(sk);
 	if (sk->sk_user_data) {
 		sk = ERR_PTR(-EBUSY);
@@ -1267,6 +1719,13 @@ static int gtp_encap_enable(struct gtp_dev *gtp, struct nlattr *data[])
 	gtp->sk0 = sk0;
 	gtp->sk1u = sk1u;
 
+	if (sk0 && sk1u &&
+	    sk0->sk_family != sk1u->sk_family) {
+		gtp_encap_disable_sock(sk0);
+		gtp_encap_disable_sock(sk1u);
+		return -EINVAL;
+	}
+
 	return 0;
 }
 
@@ -1296,14 +1755,9 @@ static struct gtp_dev *gtp_find_dev(struct net *src_net, struct nlattr *nla[])
 	return gtp;
 }
 
-static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info)
+static void gtp_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info)
 {
 	pctx->gtp_version = nla_get_u32(info->attrs[GTPA_VERSION]);
-	pctx->af = AF_INET;
-	pctx->peer_addr_ip4.s_addr =
-		nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]);
-	pctx->ms_addr_ip4.s_addr =
-		nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
 
 	switch (pctx->gtp_version) {
 	case GTP_V0:
@@ -1323,29 +1777,102 @@ static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info)
 	}
 }
 
+static void ip_pdp_peer_fill(struct pdp_ctx *pctx, struct genl_info *info)
+{
+	if (info->attrs[GTPA_PEER_ADDRESS]) {
+		pctx->peer.addr.s_addr =
+			nla_get_be32(info->attrs[GTPA_PEER_ADDRESS]);
+	} else if (info->attrs[GTPA_PEER_ADDR6]) {
+		pctx->peer.addr6 = nla_get_in6_addr(info->attrs[GTPA_PEER_ADDR6]);
+	}
+}
+
+static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info)
+{
+	ip_pdp_peer_fill(pctx, info);
+	pctx->ms.addr.s_addr =
+		nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
+	gtp_pdp_fill(pctx, info);
+}
+
+static bool ipv6_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info)
+{
+	ip_pdp_peer_fill(pctx, info);
+	pctx->ms.addr6 = nla_get_in6_addr(info->attrs[GTPA_MS_ADDR6]);
+	if (pctx->ms.addr6.s6_addr32[2] ||
+	    pctx->ms.addr6.s6_addr32[3])
+		return false;
+
+	gtp_pdp_fill(pctx, info);
+
+	return true;
+}
+
 static struct pdp_ctx *gtp_pdp_add(struct gtp_dev *gtp, struct sock *sk,
 				   struct genl_info *info)
 {
 	struct pdp_ctx *pctx, *pctx_tid = NULL;
 	struct net_device *dev = gtp->dev;
 	u32 hash_ms, hash_tid = 0;
+	struct in6_addr ms_addr6;
 	unsigned int version;
 	bool found = false;
 	__be32 ms_addr;
+	int family;
 
-	ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
-	hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size;
 	version = nla_get_u32(info->attrs[GTPA_VERSION]);
 
-	pctx = ipv4_pdp_find(gtp, ms_addr);
+	if (info->attrs[GTPA_FAMILY])
+		family = nla_get_u8(info->attrs[GTPA_FAMILY]);
+	else
+		family = AF_INET;
+
+#if !IS_ENABLED(CONFIG_IPV6)
+	if (family == AF_INET6)
+		return ERR_PTR(-EAFNOSUPPORT);
+#endif
+	if (!info->attrs[GTPA_PEER_ADDRESS] &&
+	    !info->attrs[GTPA_PEER_ADDR6])
+		return ERR_PTR(-EINVAL);
+
+	if ((info->attrs[GTPA_PEER_ADDRESS] &&
+	     sk->sk_family == AF_INET6) ||
+	    (info->attrs[GTPA_PEER_ADDR6] &&
+	     sk->sk_family == AF_INET))
+		return ERR_PTR(-EAFNOSUPPORT);
+
+	switch (family) {
+	case AF_INET:
+		if (!info->attrs[GTPA_MS_ADDRESS] ||
+		    info->attrs[GTPA_MS_ADDR6])
+			return ERR_PTR(-EINVAL);
+
+		ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);
+		hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size;
+		pctx = ipv4_pdp_find(gtp, ms_addr);
+		break;
+	case AF_INET6:
+		if (!info->attrs[GTPA_MS_ADDR6] ||
+		    info->attrs[GTPA_MS_ADDRESS])
+			return ERR_PTR(-EINVAL);
+
+		ms_addr6 = nla_get_in6_addr(info->attrs[GTPA_MS_ADDR6]);
+		hash_ms = ipv6_hashfn(&ms_addr6) % gtp->hash_size;
+		pctx = ipv6_pdp_find(gtp, &ms_addr6);
+		break;
+	default:
+		return ERR_PTR(-EAFNOSUPPORT);
+	}
 	if (pctx)
 		found = true;
 	if (version == GTP_V0)
 		pctx_tid = gtp0_pdp_find(gtp,
-					 nla_get_u64(info->attrs[GTPA_TID]));
+					 nla_get_u64(info->attrs[GTPA_TID]),
+					 family);
 	else if (version == GTP_V1)
 		pctx_tid = gtp1_pdp_find(gtp,
-					 nla_get_u32(info->attrs[GTPA_I_TEI]));
+					 nla_get_u32(info->attrs[GTPA_I_TEI]),
+					 family);
 	if (pctx_tid)
 		found = true;
 
@@ -1360,7 +1887,15 @@ static struct pdp_ctx *gtp_pdp_add(struct gtp_dev *gtp, struct sock *sk,
 		if (!pctx)
 			pctx = pctx_tid;
 
-		ipv4_pdp_fill(pctx, info);
+		switch (pctx->af) {
+		case AF_INET:
+			ipv4_pdp_fill(pctx, info);
+			break;
+		case AF_INET6:
+			if (!ipv6_pdp_fill(pctx, info))
+				return ERR_PTR(-EADDRNOTAVAIL);
+			break;
+		}
 
 		if (pctx->gtp_version == GTP_V0)
 			netdev_dbg(dev, "GTPv0-U: update tunnel id = %llx (pdp %p)\n",
@@ -1380,7 +1915,32 @@ static struct pdp_ctx *gtp_pdp_add(struct gtp_dev *gtp, struct sock *sk,
 	sock_hold(sk);
 	pctx->sk = sk;
 	pctx->dev = gtp->dev;
-	ipv4_pdp_fill(pctx, info);
+	pctx->af = family;
+
+	switch (pctx->af) {
+	case AF_INET:
+		if (!info->attrs[GTPA_MS_ADDRESS]) {
+			sock_put(sk);
+			kfree(pctx);
+			return ERR_PTR(-EINVAL);
+		}
+
+		ipv4_pdp_fill(pctx, info);
+		break;
+	case AF_INET6:
+		if (!info->attrs[GTPA_MS_ADDR6]) {
+			sock_put(sk);
+			kfree(pctx);
+			return ERR_PTR(-EINVAL);
+		}
+
+		if (!ipv6_pdp_fill(pctx, info)) {
+			sock_put(sk);
+			kfree(pctx);
+			return ERR_PTR(-EADDRNOTAVAIL);
+		}
+		break;
+	}
 	atomic_set(&pctx->tx_seq, 0);
 
 	switch (pctx->gtp_version) {
@@ -1403,13 +1963,13 @@ static struct pdp_ctx *gtp_pdp_add(struct gtp_dev *gtp, struct sock *sk,
 	switch (pctx->gtp_version) {
 	case GTP_V0:
 		netdev_dbg(dev, "GTPv0-U: new PDP ctx id=%llx ssgn=%pI4 ms=%pI4 (pdp=%p)\n",
-			   pctx->u.v0.tid, &pctx->peer_addr_ip4,
-			   &pctx->ms_addr_ip4, pctx);
+			   pctx->u.v0.tid, &pctx->peer.addr,
+			   &pctx->ms.addr, pctx);
 		break;
 	case GTP_V1:
 		netdev_dbg(dev, "GTPv1-U: new PDP ctx id=%x/%x ssgn=%pI4 ms=%pI4 (pdp=%p)\n",
 			   pctx->u.v1.i_tei, pctx->u.v1.o_tei,
-			   &pctx->peer_addr_ip4, &pctx->ms_addr_ip4, pctx);
+			   &pctx->peer.addr, &pctx->ms.addr, pctx);
 		break;
 	}
 
@@ -1442,9 +2002,7 @@ static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info)
 	int err;
 
 	if (!info->attrs[GTPA_VERSION] ||
-	    !info->attrs[GTPA_LINK] ||
-	    !info->attrs[GTPA_PEER_ADDRESS] ||
-	    !info->attrs[GTPA_MS_ADDRESS])
+	    !info->attrs[GTPA_LINK])
 		return -EINVAL;
 
 	version = nla_get_u32(info->attrs[GTPA_VERSION]);
@@ -1502,6 +2060,12 @@ static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net,
 					    struct nlattr *nla[])
 {
 	struct gtp_dev *gtp;
+	int family;
+
+	if (nla[GTPA_FAMILY])
+		family = nla_get_u8(nla[GTPA_FAMILY]);
+	else
+		family = AF_INET;
 
 	gtp = gtp_find_dev(net, nla);
 	if (!gtp)
@@ -1510,14 +2074,31 @@ static struct pdp_ctx *gtp_find_pdp_by_link(struct net *net,
 	if (nla[GTPA_MS_ADDRESS]) {
 		__be32 ip = nla_get_be32(nla[GTPA_MS_ADDRESS]);
 
+		if (family != AF_INET)
+			return ERR_PTR(-EINVAL);
+
 		return ipv4_pdp_find(gtp, ip);
+	} else if (nla[GTPA_MS_ADDR6]) {
+		struct in6_addr addr = nla_get_in6_addr(nla[GTPA_MS_ADDR6]);
+
+		if (family != AF_INET6)
+			return ERR_PTR(-EINVAL);
+
+		if (addr.s6_addr32[2] ||
+		    addr.s6_addr32[3])
+			return ERR_PTR(-EADDRNOTAVAIL);
+
+		return ipv6_pdp_find(gtp, &addr);
 	} else if (nla[GTPA_VERSION]) {
 		u32 gtp_version = nla_get_u32(nla[GTPA_VERSION]);
 
-		if (gtp_version == GTP_V0 && nla[GTPA_TID])
-			return gtp0_pdp_find(gtp, nla_get_u64(nla[GTPA_TID]));
-		else if (gtp_version == GTP_V1 && nla[GTPA_I_TEI])
-			return gtp1_pdp_find(gtp, nla_get_u32(nla[GTPA_I_TEI]));
+		if (gtp_version == GTP_V0 && nla[GTPA_TID]) {
+			return gtp0_pdp_find(gtp, nla_get_u64(nla[GTPA_TID]),
+					     family);
+		} else if (gtp_version == GTP_V1 && nla[GTPA_I_TEI]) {
+			return gtp1_pdp_find(gtp, nla_get_u32(nla[GTPA_I_TEI]),
+					     family);
+		}
 	}
 
 	return ERR_PTR(-EINVAL);
@@ -1581,10 +2162,31 @@ static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq,
 
 	if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) ||
 	    nla_put_u32(skb, GTPA_LINK, pctx->dev->ifindex) ||
-	    nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer_addr_ip4.s_addr) ||
-	    nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr))
+	    nla_put_u8(skb, GTPA_FAMILY, pctx->af))
 		goto nla_put_failure;
 
+	switch (pctx->af) {
+	case AF_INET:
+		if (nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms.addr.s_addr))
+			goto nla_put_failure;
+		break;
+	case AF_INET6:
+		if (nla_put_in6_addr(skb, GTPA_MS_ADDR6, &pctx->ms.addr6))
+			goto nla_put_failure;
+		break;
+	}
+
+	switch (pctx->sk->sk_family) {
+	case AF_INET:
+		if (nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer.addr.s_addr))
+			goto nla_put_failure;
+		break;
+	case AF_INET6:
+		if (nla_put_in6_addr(skb, GTPA_PEER_ADDR6, &pctx->peer.addr6))
+			goto nla_put_failure;
+		break;
+	}
+
 	switch (pctx->gtp_version) {
 	case GTP_V0:
 		if (nla_put_u64_64bit(skb, GTPA_TID, pctx->u.v0.tid, GTPA_PAD) ||
@@ -1811,6 +2413,9 @@ static const struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = {
 	[GTPA_NET_NS_FD]	= { .type = NLA_U32, },
 	[GTPA_I_TEI]		= { .type = NLA_U32, },
 	[GTPA_O_TEI]		= { .type = NLA_U32, },
+	[GTPA_PEER_ADDR6]	= { .len = sizeof(struct in6_addr), },
+	[GTPA_MS_ADDR6]		= { .len = sizeof(struct in6_addr), },
+	[GTPA_FAMILY]		= { .type = NLA_U8, },
 };
 
 static const struct genl_small_ops gtp_genl_ops[] = {