cregit-Linux how code gets into the kernel

Release 4.8 net/l2tp/l2tp_netlink.c

Directory: net/l2tp
/*
 * L2TP netlink layer, for management
 *
 * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
 *
 * Partly based on the IrDA nelink implementation
 * (see net/irda/irnetlink.c) which is:
 * Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org>
 * which is in turn partly based on the wireless netlink code:
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <net/sock.h>
#include <net/genetlink.h>
#include <net/udp.h>
#include <linux/in.h>
#include <linux/udp.h>
#include <linux/socket.h>
#include <linux/module.h>
#include <linux/list.h>
#include <net/net_namespace.h>

#include <linux/l2tp.h>

#include "l2tp_core.h"



static struct genl_family l2tp_nl_family = {
	.id		= GENL_ID_GENERATE,
	.name		= L2TP_GENL_NAME,
	.version	= L2TP_GENL_VERSION,
	.hdrsize	= 0,
	.maxattr	= L2TP_ATTR_MAX,
	.netnsok	= true,
};


static const struct genl_multicast_group l2tp_multicast_group[] = {
	{
		.name = L2TP_GENL_MCGROUP,
        },
};

static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
			       int flags, struct l2tp_tunnel *tunnel, u8 cmd);
static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq,
				int flags, struct l2tp_session *session,
				u8 cmd);

/* Accessed under genl lock */

static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];


static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info) { u32 tunnel_id; u32 session_id; char *ifname; struct l2tp_tunnel *tunnel; struct l2tp_session *session = NULL; struct net *net = genl_info_net(info); if (info->attrs[L2TP_ATTR_IFNAME]) { ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); session = l2tp_session_find_by_ifname(net, ifname); } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) && (info->attrs[L2TP_ATTR_CONN_ID])) { tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); tunnel = l2tp_tunnel_find(net, tunnel_id); if (tunnel) session = l2tp_session_find(net, tunnel, session_id); } return session; }

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static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info) { struct sk_buff *msg; void *hdr; int ret = -ENOBUFS; msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); if (!msg) { ret = -ENOMEM; goto out; } hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &l2tp_nl_family, 0, L2TP_CMD_NOOP); if (!hdr) { ret = -EMSGSIZE; goto err_out; } genlmsg_end(msg, hdr); return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid); err_out: nlmsg_free(msg); out: return ret; }

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eric w. biedermaneric w. biederman21.59%125.00%
thomas grafthomas graf10.79%125.00%
Total126100.00%4100.00%


static int l2tp_tunnel_notify(struct genl_family *family, struct genl_info *info, struct l2tp_tunnel *tunnel, u8 cmd) { struct sk_buff *msg; int ret; msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); if (!msg) return -ENOMEM; ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq, NLM_F_ACK, tunnel, cmd); if (ret >= 0) { ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC); /* We don't care if no one is listening */ if (ret == -ESRCH) ret = 0; return ret; } nlmsg_free(msg); return ret; }

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static int l2tp_session_notify(struct genl_family *family, struct genl_info *info, struct l2tp_session *session, u8 cmd) { struct sk_buff *msg; int ret; msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); if (!msg) return -ENOMEM; ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq, NLM_F_ACK, session, cmd); if (ret >= 0) { ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC); /* We don't care if no one is listening */ if (ret == -ESRCH) ret = 0; return ret; } nlmsg_free(msg); return ret; }

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bill hongbill hong9883.76%150.00%
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static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info) { u32 tunnel_id; u32 peer_tunnel_id; int proto_version; int fd; int ret = 0; struct l2tp_tunnel_cfg cfg = { 0, }; struct l2tp_tunnel *tunnel; struct net *net = genl_info_net(info); if (!info->attrs[L2TP_ATTR_CONN_ID]) { ret = -EINVAL; goto out; } tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) { ret = -EINVAL; goto out; } peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]); if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) { ret = -EINVAL; goto out; } proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]); if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) { ret = -EINVAL; goto out; } cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]); fd = -1; if (info->attrs[L2TP_ATTR_FD]) { fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]); } else { #if IS_ENABLED(CONFIG_IPV6) if (info->attrs[L2TP_ATTR_IP6_SADDR] && info->attrs[L2TP_ATTR_IP6_DADDR]) { cfg.local_ip6 = nla_data( info->attrs[L2TP_ATTR_IP6_SADDR]); cfg.peer_ip6 = nla_data( info->attrs[L2TP_ATTR_IP6_DADDR]); } else #endif if (info->attrs[L2TP_ATTR_IP_SADDR] && info->attrs[L2TP_ATTR_IP_DADDR]) { cfg.local_ip.s_addr = nla_get_in_addr( info->attrs[L2TP_ATTR_IP_SADDR]); cfg.peer_ip.s_addr = nla_get_in_addr( info->attrs[L2TP_ATTR_IP_DADDR]); } else { ret = -EINVAL; goto out; } if (info->attrs[L2TP_ATTR_UDP_SPORT]) cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]); if (info->attrs[L2TP_ATTR_UDP_DPORT]) cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]); if (info->attrs[L2TP_ATTR_UDP_CSUM]) cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]); #if IS_ENABLED(CONFIG_IPV6) if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]) cfg.udp6_zero_tx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]); if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]) cfg.udp6_zero_rx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]); #endif } if (info->attrs[L2TP_ATTR_DEBUG]) cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); tunnel = l2tp_tunnel_find(net, tunnel_id); if (tunnel != NULL) { ret = -EEXIST; goto out; } ret = -EINVAL; switch (cfg.encap) { case L2TP_ENCAPTYPE_UDP: case L2TP_ENCAPTYPE_IP: ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id, peer_tunnel_id, &cfg, &tunnel); break; } if (ret >= 0) ret = l2tp_tunnel_notify(&l2tp_nl_family, info, tunnel, L2TP_CMD_TUNNEL_CREATE); out: return ret; }

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chris elstonchris elston7012.28%116.67%
tom herberttom herbert549.47%116.67%
bill hongbill hong203.51%116.67%
jiri bencjiri benc20.35%116.67%
Total570100.00%6100.00%


static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info) { struct l2tp_tunnel *tunnel; u32 tunnel_id; int ret = 0; struct net *net = genl_info_net(info); if (!info->attrs[L2TP_ATTR_CONN_ID]) { ret = -EINVAL; goto out; } tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); tunnel = l2tp_tunnel_find(net, tunnel_id); if (tunnel == NULL) { ret = -ENODEV; goto out; } l2tp_tunnel_notify(&l2tp_nl_family, info, tunnel, L2TP_CMD_TUNNEL_DELETE); (void) l2tp_tunnel_delete(tunnel); out: return ret; }

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bill hongbill hong129.92%150.00%
Total121100.00%2100.00%


static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info) { struct l2tp_tunnel *tunnel; u32 tunnel_id; int ret = 0; struct net *net = genl_info_net(info); if (!info->attrs[L2TP_ATTR_CONN_ID]) { ret = -EINVAL; goto out; } tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); tunnel = l2tp_tunnel_find(net, tunnel_id); if (tunnel == NULL) { ret = -ENODEV; goto out; } if (info->attrs[L2TP_ATTR_DEBUG]) tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); ret = l2tp_tunnel_notify(&l2tp_nl_family, info, tunnel, L2TP_CMD_TUNNEL_MODIFY); out: return ret; }

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Total138100.00%2100.00%


static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags, struct l2tp_tunnel *tunnel, u8 cmd) { void *hdr; struct nlattr *nest; struct sock *sk = NULL; struct inet_sock *inet; #if IS_ENABLED(CONFIG_IPV6) struct ipv6_pinfo *np = NULL; #endif hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd); if (!hdr) return -EMSGSIZE; if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) || nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) || nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) || nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) || nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap)) goto nla_put_failure; nest = nla_nest_start(skb, L2TP_ATTR_STATS); if (nest == NULL) goto nla_put_failure; if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS, atomic_long_read(&tunnel->stats.tx_packets), L2TP_ATTR_STATS_PAD) || nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES, atomic_long_read(&tunnel->stats.tx_bytes), L2TP_ATTR_STATS_PAD) || nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS, atomic_long_read(&tunnel->stats.tx_errors), L2TP_ATTR_STATS_PAD) || nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS, atomic_long_read(&tunnel->stats.rx_packets), L2TP_ATTR_STATS_PAD) || nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES, atomic_long_read(&tunnel->stats.rx_bytes), L2TP_ATTR_STATS_PAD) || nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS, atomic_long_read(&tunnel->stats.rx_seq_discards), L2TP_ATTR_STATS_PAD) || nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS, atomic_long_read(&tunnel->stats.rx_oos_packets), L2TP_ATTR_STATS_PAD) || nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS, atomic_long_read(&tunnel->stats.rx_errors), L2TP_ATTR_STATS_PAD)) goto nla_put_failure; nla_nest_end(skb, nest); sk = tunnel->sock; if (!sk) goto out; #if IS_ENABLED(CONFIG_IPV6) if (sk->sk_family == AF_INET6) np = inet6_sk(sk); #endif inet = inet_sk(sk); switch (tunnel->encap) { case L2TP_ENCAPTYPE_UDP: if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) || nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)) || nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx)) goto nla_put_failure; /* NOBREAK */ case L2TP_ENCAPTYPE_IP: #if IS_ENABLED(CONFIG_IPV6) if (np) { if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR, &np->saddr) || nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR, &sk->sk_v6_daddr)) goto nla_put_failure; } else #endif if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) || nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr)) goto nla_put_failure; break; } out: genlmsg_end(skb, hdr); return 0; nla_put_failure: genlmsg_cancel(skb, hdr); return -1; }

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chris elstonchris elston7814.61%18.33%
tom parkintom parkin488.99%18.33%
david s. millerdavid s. miller468.61%18.33%
nicolas dichtelnicolas dichtel244.49%18.33%
bill hongbill hong40.75%18.33%
jiri bencjiri benc40.75%18.33%
johannes bergjohannes berg30.56%18.33%
wei yongjunwei yongjun30.56%18.33%
tom herberttom herbert20.37%18.33%
eric dumazeteric dumazet20.37%18.33%
eric w. biedermaneric w. biederman20.37%18.33%
Total534100.00%12100.00%


static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info) { struct l2tp_tunnel *tunnel; struct sk_buff *msg; u32 tunnel_id; int ret = -ENOBUFS; struct net *net = genl_info_net(info); if (!info->attrs[L2TP_ATTR_CONN_ID]) { ret = -EINVAL; goto out; } tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); tunnel = l2tp_tunnel_find(net, tunnel_id); if (tunnel == NULL) { ret = -ENODEV; goto out; } msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); if (!msg) { ret = -ENOMEM; goto out; } ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq, NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET); if (ret < 0) goto err_out; return genlmsg_unicast(net, msg, info->snd_portid); err_out: nlmsg_free(msg); out: return ret; }

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james chapmanjames chapman17597.22%125.00%
bill hongbill hong21.11%125.00%
eric w. biedermaneric w. biederman21.11%125.00%
thomas grafthomas graf10.56%125.00%
Total180100.00%4100.00%


static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb) { int ti = cb->args[0]; struct l2tp_tunnel *tunnel; struct net *net = sock_net(skb->sk); for (;;) { tunnel = l2tp_tunnel_find_nth(net, ti); if (tunnel == NULL) goto out; if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, NLM_F_MULTI, tunnel, L2TP_CMD_TUNNEL_GET) < 0) goto out; ti++; } out: cb->args[0] = ti; return skb->len; }

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james chapmanjames chapman11696.67%125.00%
bill hongbill hong21.67%125.00%
johannes bergjohannes berg10.83%125.00%
eric w. biedermaneric w. biederman10.83%125.00%
Total120100.00%4100.00%


static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info) { u32 tunnel_id = 0; u32 session_id; u32 peer_session_id; int ret = 0; struct l2tp_tunnel *tunnel; struct l2tp_session *session; struct l2tp_session_cfg cfg = { 0, }; struct net *net = genl_info_net(info); if (!info->attrs[L2TP_ATTR_CONN_ID]) { ret = -EINVAL; goto out; } tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); tunnel = l2tp_tunnel_find(net, tunnel_id); if (!tunnel) { ret = -ENODEV; goto out; } if (!info->attrs[L2TP_ATTR_SESSION_ID]) { ret = -EINVAL; goto out; } session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); session = l2tp_session_find(net, tunnel, session_id); if (session) { ret = -EEXIST; goto out; } if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) { ret = -EINVAL; goto out; } peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]); if (!info->attrs[L2TP_ATTR_PW_TYPE]) { ret = -EINVAL; goto out; } cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]); if (cfg.pw_type >= __L2TP_PWTYPE_MAX) { ret = -EINVAL; goto out; } if (tunnel->version > 2) { if (info->attrs[L2TP_ATTR_OFFSET]) cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]); if (info->attrs[L2TP_ATTR_DATA_SEQ]) cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT; if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]); cfg.l2specific_len = 4; if (info->attrs[L2TP_ATTR_L2SPEC_LEN]) cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]); if (info->attrs[L2TP_ATTR_COOKIE]) { u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]); if (len > 8) { ret = -EINVAL; goto out; } cfg.cookie_len = len; memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len); } if (info->attrs[L2TP_ATTR_PEER_COOKIE]) { u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]); if (len > 8) { ret = -EINVAL; goto out; } cfg.peer_cookie_len = len; memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len); } if (info->attrs[L2TP_ATTR_IFNAME]) cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); if (info->attrs[L2TP_ATTR_VLAN_ID]) cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]); } if (info->attrs[L2TP_ATTR_DEBUG]) cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); if (info->attrs[L2TP_ATTR_RECV_SEQ]) cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); if (info->attrs[L2TP_ATTR_SEND_SEQ]) cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); if (info->attrs[L2TP_ATTR_LNS_MODE]) cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); if (info->attrs[