linux/net/xfrm/xfrm_interface.c

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// SPDX-License-Identifier: GPL-2.0
/*
* XFRM virtual interface
*
* Copyright (C) 2018 secunet Security Networks AG
*
* Author:
* Steffen Klassert <steffen.klassert@secunet.com>
*/
#include <linux/module.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/sockios.h>
#include <linux/icmp.h>
#include <linux/if.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/if_link.h>
#include <linux/if_arp.h>
#include <linux/icmpv6.h>
#include <linux/init.h>
#include <linux/route.h>
#include <linux/rtnetlink.h>
#include <linux/netfilter_ipv6.h>
#include <linux/slab.h>
#include <linux/hash.h>
#include <linux/uaccess.h>
#include <linux/atomic.h>
#include <net/icmp.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/xfrm.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <linux/etherdevice.h>
static int xfrmi_dev_init(struct net_device *dev);
static void xfrmi_dev_setup(struct net_device *dev);
static struct rtnl_link_ops xfrmi_link_ops __read_mostly;
static unsigned int xfrmi_net_id __read_mostly;
struct xfrmi_net {
/* lists for storing interfaces in use */
struct xfrm_if __rcu *xfrmi[1];
};
#define for_each_xfrmi_rcu(start, xi) \
for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next))
static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x)
{
struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
struct xfrm_if *xi;
for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {
if (x->if_id == xi->p.if_id &&
(xi->dev->flags & IFF_UP))
return xi;
}
return NULL;
}
static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb)
{
struct xfrmi_net *xfrmn;
int ifindex;
struct xfrm_if *xi;
if (!secpath_exists(skb) || !skb->dev)
return NULL;
xfrmn = net_generic(xs_net(xfrm_input_state(skb)), xfrmi_net_id);
ifindex = skb->dev->ifindex;
for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {
if (ifindex == xi->dev->ifindex &&
(xi->dev->flags & IFF_UP))
return xi;
}
return NULL;
}
static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
{
struct xfrm_if __rcu **xip = &xfrmn->xfrmi[0];
rcu_assign_pointer(xi->next , rtnl_dereference(*xip));
rcu_assign_pointer(*xip, xi);
}
static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
{
struct xfrm_if __rcu **xip;
struct xfrm_if *iter;
for (xip = &xfrmn->xfrmi[0];
(iter = rtnl_dereference(*xip)) != NULL;
xip = &iter->next) {
if (xi == iter) {
rcu_assign_pointer(*xip, xi->next);
break;
}
}
}
static void xfrmi_dev_free(struct net_device *dev)
{
struct xfrm_if *xi = netdev_priv(dev);
gro_cells_destroy(&xi->gro_cells);
free_percpu(dev->tstats);
}
static int xfrmi_create2(struct net_device *dev)
{
struct xfrm_if *xi = netdev_priv(dev);
struct net *net = dev_net(dev);
struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
int err;
dev->rtnl_link_ops = &xfrmi_link_ops;
err = register_netdevice(dev);
if (err < 0)
goto out;
strcpy(xi->p.name, dev->name);
dev_hold(dev);
xfrmi_link(xfrmn, xi);
return 0;
out:
return err;
}
static struct xfrm_if *xfrmi_create(struct net *net, struct xfrm_if_parms *p)
{
struct net_device *dev;
struct xfrm_if *xi;
char name[IFNAMSIZ];
int err;
if (p->name[0]) {
strlcpy(name, p->name, IFNAMSIZ);
} else {
err = -EINVAL;
goto failed;
}
dev = alloc_netdev(sizeof(*xi), name, NET_NAME_UNKNOWN, xfrmi_dev_setup);
if (!dev) {
err = -EAGAIN;
goto failed;
}
dev_net_set(dev, net);
xi = netdev_priv(dev);
xi->p = *p;
xi->net = net;
xi->dev = dev;
xi->phydev = dev_get_by_index(net, p->link);
if (!xi->phydev) {
err = -ENODEV;
goto failed_free;
}
err = xfrmi_create2(dev);
if (err < 0)
goto failed_dev_put;
return xi;
failed_dev_put:
dev_put(xi->phydev);
failed_free:
free_netdev(dev);
failed:
return ERR_PTR(err);
}
static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p,
int create)
{
struct xfrm_if __rcu **xip;
struct xfrm_if *xi;
struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
for (xip = &xfrmn->xfrmi[0];
(xi = rtnl_dereference(*xip)) != NULL;
xip = &xi->next) {
if (xi->p.if_id == p->if_id) {
if (create)
return ERR_PTR(-EEXIST);
return xi;
}
}
if (!create)
return ERR_PTR(-ENODEV);
return xfrmi_create(net, p);
}
static void xfrmi_dev_uninit(struct net_device *dev)
{
struct xfrm_if *xi = netdev_priv(dev);
struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id);
xfrmi_unlink(xfrmn, xi);
dev_put(xi->phydev);
dev_put(dev);
}
static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet)
{
skb->tstamp = 0;
skb->pkt_type = PACKET_HOST;
skb->skb_iif = 0;
skb->ignore_df = 0;
skb_dst_drop(skb);
nf_reset(skb);
nf_reset_trace(skb);
if (!xnet)
return;
ipvs_reset(skb);
secpath_reset(skb);
skb_orphan(skb);
skb->mark = 0;
}
static int xfrmi_rcv_cb(struct sk_buff *skb, int err)
{
struct pcpu_sw_netstats *tstats;
struct xfrm_mode *inner_mode;
struct net_device *dev;
struct xfrm_state *x;
struct xfrm_if *xi;
bool xnet;
if (err && !secpath_exists(skb))
return 0;
x = xfrm_input_state(skb);
xi = xfrmi_lookup(xs_net(x), x);
if (!xi)
return 1;
dev = xi->dev;
skb->dev = dev;
if (err) {
dev->stats.rx_errors++;
dev->stats.rx_dropped++;
return 0;
}
xnet = !net_eq(xi->net, dev_net(skb->dev));
if (xnet) {
inner_mode = x->inner_mode;
if (x->sel.family == AF_UNSPEC) {
inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
if (inner_mode == NULL) {
XFRM_INC_STATS(dev_net(skb->dev),
LINUX_MIB_XFRMINSTATEMODEERROR);
return -EINVAL;
}
}
if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb,
inner_mode->family))
return -EPERM;
}
xfrmi_scrub_packet(skb, xnet);
tstats = this_cpu_ptr(dev->tstats);
u64_stats_update_begin(&tstats->syncp);
tstats->rx_packets++;
tstats->rx_bytes += skb->len;
u64_stats_update_end(&tstats->syncp);
return 0;
}
static int
xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
{
struct xfrm_if *xi = netdev_priv(dev);
struct net_device_stats *stats = &xi->dev->stats;
struct dst_entry *dst = skb_dst(skb);
unsigned int length = skb->len;
struct net_device *tdev;
struct xfrm_state *x;
int err = -1;
int mtu;
if (!dst)
goto tx_err_link_failure;
dst_hold(dst);
dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id);
if (IS_ERR(dst)) {
err = PTR_ERR(dst);
dst = NULL;
goto tx_err_link_failure;
}
x = dst->xfrm;
if (!x)
goto tx_err_link_failure;
if (x->if_id != xi->p.if_id)
goto tx_err_link_failure;
tdev = dst->dev;
if (tdev == dev) {
stats->collisions++;
net_warn_ratelimited("%s: Local routing loop detected!\n",
xi->p.name);
goto tx_err_dst_release;
}
mtu = dst_mtu(dst);
if (!skb->ignore_df && skb->len > mtu) {
skb_dst_update_pmtu(skb, mtu);
if (skb->protocol == htons(ETH_P_IPV6)) {
if (mtu < IPV6_MIN_MTU)
mtu = IPV6_MIN_MTU;
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
} else {
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
htonl(mtu));
}
dst_release(dst);
return -EMSGSIZE;
}
xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev)));
skb_dst_set(skb, dst);
skb->dev = tdev;
err = dst_output(xi->net, skb->sk, skb);
if (net_xmit_eval(err) == 0) {
struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
u64_stats_update_begin(&tstats->syncp);
tstats->tx_bytes += length;
tstats->tx_packets++;
u64_stats_update_end(&tstats->syncp);
} else {
stats->tx_errors++;
stats->tx_aborted_errors++;
}
return 0;
tx_err_link_failure:
stats->tx_carrier_errors++;
dst_link_failure(skb);
tx_err_dst_release:
dst_release(dst);
return err;
}
static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct xfrm_if *xi = netdev_priv(dev);
struct net_device_stats *stats = &xi->dev->stats;
struct flowi fl;
int ret;
memset(&fl, 0, sizeof(fl));
switch (skb->protocol) {
case htons(ETH_P_IPV6):
xfrm_decode_session(skb, &fl, AF_INET6);
memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
break;
case htons(ETH_P_IP):
xfrm_decode_session(skb, &fl, AF_INET);
memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
break;
default:
goto tx_err;
}
fl.flowi_oif = xi->phydev->ifindex;
ret = xfrmi_xmit2(skb, dev, &fl);
if (ret < 0)
goto tx_err;
return NETDEV_TX_OK;
tx_err:
stats->tx_errors++;
stats->tx_dropped++;
kfree_skb(skb);
return NETDEV_TX_OK;
}
static int xfrmi4_err(struct sk_buff *skb, u32 info)
{
const struct iphdr *iph = (const struct iphdr *)skb->data;
struct net *net = dev_net(skb->dev);
int protocol = iph->protocol;
struct ip_comp_hdr *ipch;
struct ip_esp_hdr *esph;
struct ip_auth_hdr *ah ;
struct xfrm_state *x;
struct xfrm_if *xi;
__be32 spi;
switch (protocol) {
case IPPROTO_ESP:
esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
spi = esph->spi;
break;
case IPPROTO_AH:
ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
spi = ah->spi;
break;
case IPPROTO_COMP:
ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
spi = htonl(ntohs(ipch->cpi));
break;
default:
return 0;
}
switch (icmp_hdr(skb)->type) {
case ICMP_DEST_UNREACH:
if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
return 0;
case ICMP_REDIRECT:
break;
default:
return 0;
}
x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
spi, protocol, AF_INET);
if (!x)
return 0;
xi = xfrmi_lookup(net, x);
if (!xi) {
xfrm_state_put(x);
return -1;
}
if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
ipv4_update_pmtu(skb, net, info, 0, protocol);
else
ipv4_redirect(skb, net, 0, protocol);
xfrm_state_put(x);
return 0;
}
static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
u8 type, u8 code, int offset, __be32 info)
{
const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
struct net *net = dev_net(skb->dev);
int protocol = iph->nexthdr;
struct ip_comp_hdr *ipch;
struct ip_esp_hdr *esph;
struct ip_auth_hdr *ah;
struct xfrm_state *x;
struct xfrm_if *xi;
__be32 spi;
switch (protocol) {
case IPPROTO_ESP:
esph = (struct ip_esp_hdr *)(skb->data + offset);
spi = esph->spi;
break;
case IPPROTO_AH:
ah = (struct ip_auth_hdr *)(skb->data + offset);
spi = ah->spi;
break;
case IPPROTO_COMP:
ipch = (struct ip_comp_hdr *)(skb->data + offset);
spi = htonl(ntohs(ipch->cpi));
break;
default:
return 0;
}
if (type != ICMPV6_PKT_TOOBIG &&
type != NDISC_REDIRECT)
return 0;
x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
spi, protocol, AF_INET6);
if (!x)
return 0;
xi = xfrmi_lookup(net, x);
if (!xi) {
xfrm_state_put(x);
return -1;
}
if (type == NDISC_REDIRECT)
ip6_redirect(skb, net, skb->dev->ifindex, 0,
sock_net_uid(net, NULL));
else
ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
xfrm_state_put(x);
return 0;
}
static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p)
{
if (xi->p.link != p->link)
return -EINVAL;
xi->p.if_id = p->if_id;
return 0;
}
static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p)
{
struct net *net = dev_net(xi->dev);
struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
int err;
xfrmi_unlink(xfrmn, xi);
synchronize_net();
err = xfrmi_change(xi, p);
xfrmi_link(xfrmn, xi);
netdev_state_change(xi->dev);
return err;
}
static void xfrmi_get_stats64(struct net_device *dev,
struct rtnl_link_stats64 *s)
{
int cpu;
for_each_possible_cpu(cpu) {
struct pcpu_sw_netstats *stats;
struct pcpu_sw_netstats tmp;
int start;
stats = per_cpu_ptr(dev->tstats, cpu);
do {
start = u64_stats_fetch_begin_irq(&stats->syncp);
tmp.rx_packets = stats->rx_packets;
tmp.rx_bytes = stats->rx_bytes;
tmp.tx_packets = stats->tx_packets;
tmp.tx_bytes = stats->tx_bytes;
} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
s->rx_packets += tmp.rx_packets;
s->rx_bytes += tmp.rx_bytes;
s->tx_packets += tmp.tx_packets;
s->tx_bytes += tmp.tx_bytes;
}
s->rx_dropped = dev->stats.rx_dropped;
s->tx_dropped = dev->stats.tx_dropped;
}
static int xfrmi_get_iflink(const struct net_device *dev)
{
struct xfrm_if *xi = netdev_priv(dev);
return xi->phydev->ifindex;
}
static const struct net_device_ops xfrmi_netdev_ops = {
.ndo_init = xfrmi_dev_init,
.ndo_uninit = xfrmi_dev_uninit,
.ndo_start_xmit = xfrmi_xmit,
.ndo_get_stats64 = xfrmi_get_stats64,
.ndo_get_iflink = xfrmi_get_iflink,
};
static void xfrmi_dev_setup(struct net_device *dev)
{
dev->netdev_ops = &xfrmi_netdev_ops;
dev->type = ARPHRD_NONE;
dev->hard_header_len = ETH_HLEN;
dev->min_header_len = ETH_HLEN;
dev->mtu = ETH_DATA_LEN;
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = ETH_DATA_LEN;
dev->addr_len = ETH_ALEN;
dev->flags = IFF_NOARP;
dev->needs_free_netdev = true;
dev->priv_destructor = xfrmi_dev_free;
netif_keep_dst(dev);
}
static int xfrmi_dev_init(struct net_device *dev)
{
struct xfrm_if *xi = netdev_priv(dev);
struct net_device *phydev = xi->phydev;
int err;
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!dev->tstats)
return -ENOMEM;
err = gro_cells_init(&xi->gro_cells, dev);
if (err) {
free_percpu(dev->tstats);
return err;
}
dev->features |= NETIF_F_LLTX;
dev->needed_headroom = phydev->needed_headroom;
dev->needed_tailroom = phydev->needed_tailroom;
if (is_zero_ether_addr(dev->dev_addr))
eth_hw_addr_inherit(dev, phydev);
if (is_zero_ether_addr(dev->broadcast))
memcpy(dev->broadcast, phydev->broadcast, dev->addr_len);
return 0;
}
static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
return 0;
}
static void xfrmi_netlink_parms(struct nlattr *data[],
struct xfrm_if_parms *parms)
{
memset(parms, 0, sizeof(*parms));
if (!data)
return;
if (data[IFLA_XFRM_LINK])
parms->link = nla_get_u32(data[IFLA_XFRM_LINK]);
if (data[IFLA_XFRM_IF_ID])
parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]);
}
static int xfrmi_newlink(struct net *src_net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct net *net = dev_net(dev);
struct xfrm_if_parms *p;
struct xfrm_if *xi;
xi = netdev_priv(dev);
p = &xi->p;
xfrmi_netlink_parms(data, p);
if (!tb[IFLA_IFNAME])
return -EINVAL;
nla_strlcpy(p->name, tb[IFLA_IFNAME], IFNAMSIZ);
xi = xfrmi_locate(net, p, 1);
return PTR_ERR_OR_ZERO(xi);
}
static void xfrmi_dellink(struct net_device *dev, struct list_head *head)
{
unregister_netdevice_queue(dev, head);
}
static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct xfrm_if *xi = netdev_priv(dev);
struct net *net = dev_net(dev);
xfrmi_netlink_parms(data, &xi->p);
xi = xfrmi_locate(net, &xi->p, 0);
if (IS_ERR_OR_NULL(xi)) {
xi = netdev_priv(dev);
} else {
if (xi->dev != dev)
return -EEXIST;
}
return xfrmi_update(xi, &xi->p);
}
static size_t xfrmi_get_size(const struct net_device *dev)
{
return
/* IFLA_XFRM_LINK */
nla_total_size(4) +
/* IFLA_XFRM_IF_ID */
nla_total_size(4) +
0;
}
static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
struct xfrm_if *xi = netdev_priv(dev);
struct xfrm_if_parms *parm = &xi->p;
if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) ||
nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id))
goto nla_put_failure;
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static struct net *xfrmi_get_link_net(const struct net_device *dev)
{
struct xfrm_if *xi = netdev_priv(dev);
return dev_net(xi->phydev);
}
static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = {
[IFLA_XFRM_LINK] = { .type = NLA_U32 },
[IFLA_XFRM_IF_ID] = { .type = NLA_U32 },
};
static struct rtnl_link_ops xfrmi_link_ops __read_mostly = {
.kind = "xfrm",
.maxtype = IFLA_XFRM_MAX,
.policy = xfrmi_policy,
.priv_size = sizeof(struct xfrm_if),
.setup = xfrmi_dev_setup,
.validate = xfrmi_validate,
.newlink = xfrmi_newlink,
.dellink = xfrmi_dellink,
.changelink = xfrmi_changelink,
.get_size = xfrmi_get_size,
.fill_info = xfrmi_fill_info,
.get_link_net = xfrmi_get_link_net,
};
static void __net_exit xfrmi_destroy_interfaces(struct xfrmi_net *xfrmn)
{
struct xfrm_if *xi;
LIST_HEAD(list);
xi = rtnl_dereference(xfrmn->xfrmi[0]);
if (!xi)
return;
unregister_netdevice_queue(xi->dev, &list);
unregister_netdevice_many(&list);
}
static int __net_init xfrmi_init_net(struct net *net)
{
return 0;
}
static void __net_exit xfrmi_exit_net(struct net *net)
{
struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
rtnl_lock();
xfrmi_destroy_interfaces(xfrmn);
rtnl_unlock();
}
static struct pernet_operations xfrmi_net_ops = {
.init = xfrmi_init_net,
.exit = xfrmi_exit_net,
.id = &xfrmi_net_id,
.size = sizeof(struct xfrmi_net),
};
static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = {
.handler = xfrm6_rcv,
.cb_handler = xfrmi_rcv_cb,
.err_handler = xfrmi6_err,
.priority = 10,
};
static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = {
.handler = xfrm6_rcv,
.cb_handler = xfrmi_rcv_cb,
.err_handler = xfrmi6_err,
.priority = 10,
};
static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = {
.handler = xfrm6_rcv,
.cb_handler = xfrmi_rcv_cb,
.err_handler = xfrmi6_err,
.priority = 10,
};
static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = {
.handler = xfrm4_rcv,
.input_handler = xfrm_input,
.cb_handler = xfrmi_rcv_cb,
.err_handler = xfrmi4_err,
.priority = 10,
};
static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = {
.handler = xfrm4_rcv,
.input_handler = xfrm_input,
.cb_handler = xfrmi_rcv_cb,
.err_handler = xfrmi4_err,
.priority = 10,
};
static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = {
.handler = xfrm4_rcv,
.input_handler = xfrm_input,
.cb_handler = xfrmi_rcv_cb,
.err_handler = xfrmi4_err,
.priority = 10,
};
static int __init xfrmi4_init(void)
{
int err;
err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP);
if (err < 0)
goto xfrm_proto_esp_failed;
err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH);
if (err < 0)
goto xfrm_proto_ah_failed;
err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
if (err < 0)
goto xfrm_proto_comp_failed;
return 0;
xfrm_proto_comp_failed:
xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
xfrm_proto_ah_failed:
xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
xfrm_proto_esp_failed:
return err;
}
static void xfrmi4_fini(void)
{
xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
}
static int __init xfrmi6_init(void)
{
int err;
err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP);
if (err < 0)
goto xfrm_proto_esp_failed;
err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH);
if (err < 0)
goto xfrm_proto_ah_failed;
err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
if (err < 0)
goto xfrm_proto_comp_failed;
return 0;
xfrm_proto_comp_failed:
xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
xfrm_proto_ah_failed:
xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
xfrm_proto_esp_failed:
return err;
}
static void xfrmi6_fini(void)
{
xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
}
static const struct xfrm_if_cb xfrm_if_cb = {
.decode_session = xfrmi_decode_session,
};
static int __init xfrmi_init(void)
{
const char *msg;
int err;
pr_info("IPsec XFRM device driver\n");
msg = "tunnel device";
err = register_pernet_device(&xfrmi_net_ops);
if (err < 0)
goto pernet_dev_failed;
msg = "xfrm4 protocols";
err = xfrmi4_init();
if (err < 0)
goto xfrmi4_failed;
msg = "xfrm6 protocols";
err = xfrmi6_init();
if (err < 0)
goto xfrmi6_failed;
msg = "netlink interface";
err = rtnl_link_register(&xfrmi_link_ops);
if (err < 0)
goto rtnl_link_failed;
xfrm_if_register_cb(&xfrm_if_cb);
return err;
rtnl_link_failed:
xfrmi6_fini();
xfrmi6_failed:
xfrmi4_fini();
xfrmi4_failed:
unregister_pernet_device(&xfrmi_net_ops);
pernet_dev_failed:
pr_err("xfrmi init: failed to register %s\n", msg);
return err;
}
static void __exit xfrmi_fini(void)
{
xfrm_if_unregister_cb();
rtnl_link_unregister(&xfrmi_link_ops);
xfrmi4_fini();
xfrmi6_fini();
unregister_pernet_device(&xfrmi_net_ops);
}
module_init(xfrmi_init);
module_exit(xfrmi_fini);
MODULE_LICENSE("GPL");
MODULE_ALIAS_RTNL_LINK("xfrm");
MODULE_ALIAS_NETDEV("xfrm0");
MODULE_AUTHOR("Steffen Klassert");
MODULE_DESCRIPTION("XFRM virtual interface");