linux: also import l2tp.h from kernel-5.0

The L2TP_ATTR_UDP_ZERO_CSUM6_{TX,RX} attributes are introduced by
6b649feafe10b293f4bd5a74aca95faf625ae525, which is included in
kernel-3.16. To support older kernel, let's import the header.

Fixes #12300.

diff --git a/src/basic/linux/l2tp.h b/src/basic/linux/l2tp.h
new file mode 100644 (file)
index 0000000..61158f5
--- /dev/null
+++ b/src/basic/linux/l2tp.h
@@ -0,0 +1,201 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * L2TP-over-IP socket for L2TPv3.
+ *
+ * Author: James Chapman <jchapman@katalix.com>
+ */
+
+#ifndef _UAPI_LINUX_L2TP_H_
+#define _UAPI_LINUX_L2TP_H_
+
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+
+#define IPPROTO_L2TP           115
+
+/**
+ * struct sockaddr_l2tpip - the sockaddr structure for L2TP-over-IP sockets
+ * @l2tp_family:  address family number AF_L2TPIP.
+ * @l2tp_addr:    protocol specific address information
+ * @l2tp_conn_id: connection id of tunnel
+ */
+#define __SOCK_SIZE__  16              /* sizeof(struct sockaddr)      */
+struct sockaddr_l2tpip {
+       /* The first fields must match struct sockaddr_in */
+       __kernel_sa_family_t l2tp_family; /* AF_INET */
+       __be16          l2tp_unused;    /* INET port number (unused) */
+       struct in_addr  l2tp_addr;      /* Internet address */
+
+       __u32           l2tp_conn_id;   /* Connection ID of tunnel */
+
+       /* Pad to size of `struct sockaddr'. */
+       unsigned char   __pad[__SOCK_SIZE__ -
+                             sizeof(__kernel_sa_family_t) -
+                             sizeof(__be16) - sizeof(struct in_addr) -
+                             sizeof(__u32)];
+};
+
+/**
+ * struct sockaddr_l2tpip6 - the sockaddr structure for L2TP-over-IPv6 sockets
+ * @l2tp_family:  address family number AF_L2TPIP.
+ * @l2tp_addr:    protocol specific address information
+ * @l2tp_conn_id: connection id of tunnel
+ */
+struct sockaddr_l2tpip6 {
+       /* The first fields must match struct sockaddr_in6 */
+       __kernel_sa_family_t l2tp_family; /* AF_INET6 */
+       __be16          l2tp_unused;    /* INET port number (unused) */
+       __be32          l2tp_flowinfo;  /* IPv6 flow information */
+       struct in6_addr l2tp_addr;      /* IPv6 address */
+       __u32           l2tp_scope_id;  /* scope id (new in RFC2553) */
+       __u32           l2tp_conn_id;   /* Connection ID of tunnel */
+};
+
+/*****************************************************************************
+ *  NETLINK_GENERIC netlink family.
+ *****************************************************************************/
+
+/*
+ * Commands.
+ * Valid TLVs of each command are:-
+ * TUNNEL_CREATE       - CONN_ID, pw_type, netns, ifname, ipinfo, udpinfo, udpcsum
+ * TUNNEL_DELETE       - CONN_ID
+ * TUNNEL_MODIFY       - CONN_ID, udpcsum
+ * TUNNEL_GETSTATS     - CONN_ID, (stats)
+ * TUNNEL_GET          - CONN_ID, (...)
+ * SESSION_CREATE      - SESSION_ID, PW_TYPE, cookie, peer_cookie, l2spec
+ * SESSION_DELETE      - SESSION_ID
+ * SESSION_MODIFY      - SESSION_ID
+ * SESSION_GET         - SESSION_ID, (...)
+ * SESSION_GETSTATS    - SESSION_ID, (stats)
+ *
+ */
+enum {
+       L2TP_CMD_NOOP,
+       L2TP_CMD_TUNNEL_CREATE,
+       L2TP_CMD_TUNNEL_DELETE,
+       L2TP_CMD_TUNNEL_MODIFY,
+       L2TP_CMD_TUNNEL_GET,
+       L2TP_CMD_SESSION_CREATE,
+       L2TP_CMD_SESSION_DELETE,
+       L2TP_CMD_SESSION_MODIFY,
+       L2TP_CMD_SESSION_GET,
+       __L2TP_CMD_MAX,
+};
+
+#define L2TP_CMD_MAX                   (__L2TP_CMD_MAX - 1)
+
+/*
+ * ATTR types defined for L2TP
+ */
+enum {
+       L2TP_ATTR_NONE,                 /* no data */
+       L2TP_ATTR_PW_TYPE,              /* u16, enum l2tp_pwtype */
+       L2TP_ATTR_ENCAP_TYPE,           /* u16, enum l2tp_encap_type */
+       L2TP_ATTR_OFFSET,               /* u16 (not used) */
+       L2TP_ATTR_DATA_SEQ,             /* u16 (not used) */
+       L2TP_ATTR_L2SPEC_TYPE,          /* u8, enum l2tp_l2spec_type */
+       L2TP_ATTR_L2SPEC_LEN,           /* u8 (not used) */
+       L2TP_ATTR_PROTO_VERSION,        /* u8 */
+       L2TP_ATTR_IFNAME,               /* string */
+       L2TP_ATTR_CONN_ID,              /* u32 */
+       L2TP_ATTR_PEER_CONN_ID,         /* u32 */
+       L2TP_ATTR_SESSION_ID,           /* u32 */
+       L2TP_ATTR_PEER_SESSION_ID,      /* u32 */
+       L2TP_ATTR_UDP_CSUM,             /* u8 */
+       L2TP_ATTR_VLAN_ID,              /* u16 (not used) */
+       L2TP_ATTR_COOKIE,               /* 0, 4 or 8 bytes */
+       L2TP_ATTR_PEER_COOKIE,          /* 0, 4 or 8 bytes */
+       L2TP_ATTR_DEBUG,                /* u32, enum l2tp_debug_flags */
+       L2TP_ATTR_RECV_SEQ,             /* u8 */
+       L2TP_ATTR_SEND_SEQ,             /* u8 */
+       L2TP_ATTR_LNS_MODE,             /* u8 */
+       L2TP_ATTR_USING_IPSEC,          /* u8 */
+       L2TP_ATTR_RECV_TIMEOUT,         /* msec */
+       L2TP_ATTR_FD,                   /* int */
+       L2TP_ATTR_IP_SADDR,             /* u32 */
+       L2TP_ATTR_IP_DADDR,             /* u32 */
+       L2TP_ATTR_UDP_SPORT,            /* u16 */
+       L2TP_ATTR_UDP_DPORT,            /* u16 */
+       L2TP_ATTR_MTU,                  /* u16 (not used) */
+       L2TP_ATTR_MRU,                  /* u16 (not used) */
+       L2TP_ATTR_STATS,                /* nested */
+       L2TP_ATTR_IP6_SADDR,            /* struct in6_addr */
+       L2TP_ATTR_IP6_DADDR,            /* struct in6_addr */
+       L2TP_ATTR_UDP_ZERO_CSUM6_TX,    /* flag */
+       L2TP_ATTR_UDP_ZERO_CSUM6_RX,    /* flag */
+       L2TP_ATTR_PAD,
+       __L2TP_ATTR_MAX,
+};
+
+#define L2TP_ATTR_MAX                  (__L2TP_ATTR_MAX - 1)
+
+/* Nested in L2TP_ATTR_STATS */
+enum {
+       L2TP_ATTR_STATS_NONE,           /* no data */
+       L2TP_ATTR_TX_PACKETS,           /* u64 */
+       L2TP_ATTR_TX_BYTES,             /* u64 */
+       L2TP_ATTR_TX_ERRORS,            /* u64 */
+       L2TP_ATTR_RX_PACKETS,           /* u64 */
+       L2TP_ATTR_RX_BYTES,             /* u64 */
+       L2TP_ATTR_RX_SEQ_DISCARDS,      /* u64 */
+       L2TP_ATTR_RX_OOS_PACKETS,       /* u64 */
+       L2TP_ATTR_RX_ERRORS,            /* u64 */
+       L2TP_ATTR_STATS_PAD,
+       __L2TP_ATTR_STATS_MAX,
+};
+
+#define L2TP_ATTR_STATS_MAX            (__L2TP_ATTR_STATS_MAX - 1)
+
+enum l2tp_pwtype {
+       L2TP_PWTYPE_NONE = 0x0000,
+       L2TP_PWTYPE_ETH_VLAN = 0x0004,
+       L2TP_PWTYPE_ETH = 0x0005,
+       L2TP_PWTYPE_PPP = 0x0007,
+       L2TP_PWTYPE_PPP_AC = 0x0008,
+       L2TP_PWTYPE_IP = 0x000b,
+       __L2TP_PWTYPE_MAX
+};
+
+enum l2tp_l2spec_type {
+       L2TP_L2SPECTYPE_NONE,
+       L2TP_L2SPECTYPE_DEFAULT,
+};
+
+enum l2tp_encap_type {
+       L2TP_ENCAPTYPE_UDP,
+       L2TP_ENCAPTYPE_IP,
+};
+
+/* For L2TP_ATTR_DATA_SEQ. Unused. */
+enum l2tp_seqmode {
+       L2TP_SEQ_NONE = 0,
+       L2TP_SEQ_IP = 1,
+       L2TP_SEQ_ALL = 2,
+};
+
+/**
+ * enum l2tp_debug_flags - debug message categories for L2TP tunnels/sessions
+ *
+ * @L2TP_MSG_DEBUG: verbose debug (if compiled in)
+ * @L2TP_MSG_CONTROL: userspace - kernel interface
+ * @L2TP_MSG_SEQ: sequence numbers
+ * @L2TP_MSG_DATA: data packets
+ */
+enum l2tp_debug_flags {
+       L2TP_MSG_DEBUG          = (1 << 0),
+       L2TP_MSG_CONTROL        = (1 << 1),
+       L2TP_MSG_SEQ            = (1 << 2),
+       L2TP_MSG_DATA           = (1 << 3),
+};
+
+/*
+ * NETLINK_GENERIC related info
+ */
+#define L2TP_GENL_NAME         "l2tp"
+#define L2TP_GENL_VERSION      0x1
+#define L2TP_GENL_MCGROUP       "l2tp"
+
+#endif /* _UAPI_LINUX_L2TP_H_ */

diff --git a/src/basic/meson.build b/src/basic/meson.build
index 26c7fc42c765725a084bbb509d6cd2c5aac14a64..67f04bcbc4b9b9b4ca1d8fc83cd227f8149699c8 100644 (file)
--- a/src/basic/meson.build
+++ b/src/basic/meson.build
@@ -100,6 +100,7 @@ basic_sources = files('''
         linux/if_tunnel.h
         linux/in.h
         linux/in6.h
+        linux/l2tp.h
         linux/libc-compat.h
         linux/netdevice.h
         linux/netlink.h