mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 14:41:02 +07:00
xfrm4: Add IPsec protocol multiplexer
This patch add an IPsec protocol multiplexer. With this it is possible to add alternative protocol handlers as needed for IPsec virtual tunnel interfaces. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert
parent
51adfcc333
commit
3328715e6c
@ -1347,6 +1347,18 @@ struct xfrm_algo_desc {
|
||||
struct sadb_alg desc;
|
||||
};
|
||||
|
||||
/* XFRM protocol handlers. */
|
||||
struct xfrm4_protocol {
|
||||
int (*handler)(struct sk_buff *skb);
|
||||
int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
|
||||
int encap_type);
|
||||
int (*cb_handler)(struct sk_buff *skb, int err);
|
||||
int (*err_handler)(struct sk_buff *skb, u32 info);
|
||||
|
||||
struct xfrm4_protocol __rcu *next;
|
||||
int priority;
|
||||
};
|
||||
|
||||
/* XFRM tunnel handlers. */
|
||||
struct xfrm_tunnel {
|
||||
int (*handler)(struct sk_buff *skb);
|
||||
@ -1498,13 +1510,18 @@ int xfrm4_rcv(struct sk_buff *skb);
|
||||
|
||||
static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
|
||||
{
|
||||
return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
|
||||
XFRM_SPI_SKB_CB(skb)->family = AF_INET;
|
||||
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
|
||||
return xfrm_input(skb, nexthdr, spi, 0);
|
||||
}
|
||||
|
||||
int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
|
||||
int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
|
||||
int xfrm4_output(struct sk_buff *skb);
|
||||
int xfrm4_output_finish(struct sk_buff *skb);
|
||||
int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
|
||||
int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
|
||||
int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
|
||||
int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
|
||||
int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
|
||||
void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
|
||||
@ -1752,4 +1769,16 @@ static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family,
|
||||
u8 protocol, int err)
|
||||
{
|
||||
switch(family) {
|
||||
#ifdef CONFIG_INET
|
||||
case AF_INET:
|
||||
return xfrm4_rcv_cb(skb, protocol, err);
|
||||
#endif
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif /* _NET_XFRM_H */
|
||||
|
||||
@ -55,4 +55,4 @@ obj-$(CONFIG_MEMCG_KMEM) += tcp_memcontrol.o
|
||||
obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
|
||||
|
||||
obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
|
||||
xfrm4_output.o
|
||||
xfrm4_output.o xfrm4_protocol.o
|
||||
|
||||
@ -37,15 +37,6 @@ static inline int xfrm4_rcv_encap_finish(struct sk_buff *skb)
|
||||
return NET_RX_DROP;
|
||||
}
|
||||
|
||||
int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
|
||||
int encap_type)
|
||||
{
|
||||
XFRM_SPI_SKB_CB(skb)->family = AF_INET;
|
||||
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
|
||||
return xfrm_input(skb, nexthdr, spi, encap_type);
|
||||
}
|
||||
EXPORT_SYMBOL(xfrm4_rcv_encap);
|
||||
|
||||
int xfrm4_transport_finish(struct sk_buff *skb, int async)
|
||||
{
|
||||
struct iphdr *iph = ip_hdr(skb);
|
||||
|
||||
268
net/ipv4/xfrm4_protocol.c
Normal file
268
net/ipv4/xfrm4_protocol.c
Normal file
@ -0,0 +1,268 @@
|
||||
/* xfrm4_protocol.c - Generic xfrm protocol multiplexer.
|
||||
*
|
||||
* Copyright (C) 2013 secunet Security Networks AG
|
||||
*
|
||||
* Author:
|
||||
* Steffen Klassert <steffen.klassert@secunet.com>
|
||||
*
|
||||
* Based on:
|
||||
* net/ipv4/tunnel4.c
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* as published by the Free Software Foundation; either version
|
||||
* 2 of the License, or (at your option) any later version.
|
||||
*/
|
||||
|
||||
#include <linux/init.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/skbuff.h>
|
||||
#include <net/icmp.h>
|
||||
#include <net/ip.h>
|
||||
#include <net/protocol.h>
|
||||
#include <net/xfrm.h>
|
||||
|
||||
static struct xfrm4_protocol __rcu *esp4_handlers __read_mostly;
|
||||
static struct xfrm4_protocol __rcu *ah4_handlers __read_mostly;
|
||||
static struct xfrm4_protocol __rcu *ipcomp4_handlers __read_mostly;
|
||||
static DEFINE_MUTEX(xfrm4_protocol_mutex);
|
||||
|
||||
static inline struct xfrm4_protocol __rcu **proto_handlers(u8 protocol)
|
||||
{
|
||||
switch (protocol) {
|
||||
case IPPROTO_ESP:
|
||||
return &esp4_handlers;
|
||||
case IPPROTO_AH:
|
||||
return &ah4_handlers;
|
||||
case IPPROTO_COMP:
|
||||
return &ipcomp4_handlers;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
#define for_each_protocol_rcu(head, handler) \
|
||||
for (handler = rcu_dereference(head); \
|
||||
handler != NULL; \
|
||||
handler = rcu_dereference(handler->next)) \
|
||||
|
||||
int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err)
|
||||
{
|
||||
int ret;
|
||||
struct xfrm4_protocol *handler;
|
||||
|
||||
for_each_protocol_rcu(*proto_handlers(protocol), handler)
|
||||
if ((ret = handler->cb_handler(skb, err)) <= 0)
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(xfrm4_rcv_cb);
|
||||
|
||||
int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
|
||||
int encap_type)
|
||||
{
|
||||
int ret;
|
||||
struct xfrm4_protocol *handler;
|
||||
|
||||
XFRM_SPI_SKB_CB(skb)->family = AF_INET;
|
||||
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
|
||||
|
||||
for_each_protocol_rcu(*proto_handlers(nexthdr), handler)
|
||||
if ((ret = handler->input_handler(skb, nexthdr, spi, encap_type)) != -EINVAL)
|
||||
return ret;
|
||||
|
||||
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
|
||||
|
||||
kfree_skb(skb);
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(xfrm4_rcv_encap);
|
||||
|
||||
static int xfrm4_esp_rcv(struct sk_buff *skb)
|
||||
{
|
||||
int ret;
|
||||
struct xfrm4_protocol *handler;
|
||||
|
||||
for_each_protocol_rcu(esp4_handlers, handler)
|
||||
if ((ret = handler->handler(skb)) != -EINVAL)
|
||||
return ret;
|
||||
|
||||
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
|
||||
|
||||
kfree_skb(skb);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void xfrm4_esp_err(struct sk_buff *skb, u32 info)
|
||||
{
|
||||
struct xfrm4_protocol *handler;
|
||||
|
||||
for_each_protocol_rcu(esp4_handlers, handler)
|
||||
if (!handler->err_handler(skb, info))
|
||||
break;
|
||||
}
|
||||
|
||||
static int xfrm4_ah_rcv(struct sk_buff *skb)
|
||||
{
|
||||
int ret;
|
||||
struct xfrm4_protocol *handler;
|
||||
|
||||
for_each_protocol_rcu(ah4_handlers, handler)
|
||||
if ((ret = handler->handler(skb)) != -EINVAL)
|
||||
return ret;;
|
||||
|
||||
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
|
||||
|
||||
kfree_skb(skb);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void xfrm4_ah_err(struct sk_buff *skb, u32 info)
|
||||
{
|
||||
struct xfrm4_protocol *handler;
|
||||
|
||||
for_each_protocol_rcu(ah4_handlers, handler)
|
||||
if (!handler->err_handler(skb, info))
|
||||
break;
|
||||
}
|
||||
|
||||
static int xfrm4_ipcomp_rcv(struct sk_buff *skb)
|
||||
{
|
||||
int ret;
|
||||
struct xfrm4_protocol *handler;
|
||||
|
||||
for_each_protocol_rcu(ipcomp4_handlers, handler)
|
||||
if ((ret = handler->handler(skb)) != -EINVAL)
|
||||
return ret;
|
||||
|
||||
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
|
||||
|
||||
kfree_skb(skb);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void xfrm4_ipcomp_err(struct sk_buff *skb, u32 info)
|
||||
{
|
||||
struct xfrm4_protocol *handler;
|
||||
|
||||
for_each_protocol_rcu(ipcomp4_handlers, handler)
|
||||
if (!handler->err_handler(skb, info))
|
||||
break;
|
||||
}
|
||||
|
||||
static const struct net_protocol esp4_protocol = {
|
||||
.handler = xfrm4_esp_rcv,
|
||||
.err_handler = xfrm4_esp_err,
|
||||
.no_policy = 1,
|
||||
.netns_ok = 1,
|
||||
};
|
||||
|
||||
static const struct net_protocol ah4_protocol = {
|
||||
.handler = xfrm4_ah_rcv,
|
||||
.err_handler = xfrm4_ah_err,
|
||||
.no_policy = 1,
|
||||
.netns_ok = 1,
|
||||
};
|
||||
|
||||
static const struct net_protocol ipcomp4_protocol = {
|
||||
.handler = xfrm4_ipcomp_rcv,
|
||||
.err_handler = xfrm4_ipcomp_err,
|
||||
.no_policy = 1,
|
||||
.netns_ok = 1,
|
||||
};
|
||||
|
||||
static inline const struct net_protocol *netproto(unsigned char protocol)
|
||||
{
|
||||
switch (protocol) {
|
||||
case IPPROTO_ESP:
|
||||
return &esp4_protocol;
|
||||
case IPPROTO_AH:
|
||||
return &ah4_protocol;
|
||||
case IPPROTO_COMP:
|
||||
return &ipcomp4_protocol;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int xfrm4_protocol_register(struct xfrm4_protocol *handler,
|
||||
unsigned char protocol)
|
||||
{
|
||||
struct xfrm4_protocol __rcu **pprev;
|
||||
struct xfrm4_protocol *t;
|
||||
bool add_netproto = false;
|
||||
|
||||
int ret = -EEXIST;
|
||||
int priority = handler->priority;
|
||||
|
||||
mutex_lock(&xfrm4_protocol_mutex);
|
||||
|
||||
if (!rcu_dereference_protected(*proto_handlers(protocol),
|
||||
lockdep_is_held(&xfrm4_protocol_mutex)))
|
||||
add_netproto = true;
|
||||
|
||||
for (pprev = proto_handlers(protocol);
|
||||
(t = rcu_dereference_protected(*pprev,
|
||||
lockdep_is_held(&xfrm4_protocol_mutex))) != NULL;
|
||||
pprev = &t->next) {
|
||||
if (t->priority < priority)
|
||||
break;
|
||||
if (t->priority == priority)
|
||||
goto err;
|
||||
}
|
||||
|
||||
handler->next = *pprev;
|
||||
rcu_assign_pointer(*pprev, handler);
|
||||
|
||||
ret = 0;
|
||||
|
||||
err:
|
||||
mutex_unlock(&xfrm4_protocol_mutex);
|
||||
|
||||
if (add_netproto) {
|
||||
if (inet_add_protocol(netproto(protocol), protocol)) {
|
||||
pr_err("%s: can't add protocol\n", __func__);
|
||||
ret = -EAGAIN;
|
||||
}
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(xfrm4_protocol_register);
|
||||
|
||||
int xfrm4_protocol_deregister(struct xfrm4_protocol *handler,
|
||||
unsigned char protocol)
|
||||
{
|
||||
struct xfrm4_protocol __rcu **pprev;
|
||||
struct xfrm4_protocol *t;
|
||||
int ret = -ENOENT;
|
||||
|
||||
mutex_lock(&xfrm4_protocol_mutex);
|
||||
|
||||
for (pprev = proto_handlers(protocol);
|
||||
(t = rcu_dereference_protected(*pprev,
|
||||
lockdep_is_held(&xfrm4_protocol_mutex))) != NULL;
|
||||
pprev = &t->next) {
|
||||
if (t == handler) {
|
||||
*pprev = handler->next;
|
||||
ret = 0;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (!rcu_dereference_protected(*proto_handlers(protocol),
|
||||
lockdep_is_held(&xfrm4_protocol_mutex))) {
|
||||
if (inet_del_protocol(netproto(protocol), protocol) < 0) {
|
||||
pr_err("%s: can't remove protocol\n", __func__);
|
||||
ret = -EAGAIN;
|
||||
}
|
||||
}
|
||||
|
||||
mutex_unlock(&xfrm4_protocol_mutex);
|
||||
|
||||
synchronize_net();
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(xfrm4_protocol_deregister);
|
||||
@ -108,7 +108,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
|
||||
int err;
|
||||
__be32 seq;
|
||||
__be32 seq_hi;
|
||||
struct xfrm_state *x;
|
||||
struct xfrm_state *x = NULL;
|
||||
xfrm_address_t *daddr;
|
||||
struct xfrm_mode *inner_mode;
|
||||
unsigned int family;
|
||||
@ -120,9 +120,14 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
|
||||
async = 1;
|
||||
x = xfrm_input_state(skb);
|
||||
seq = XFRM_SKB_CB(skb)->seq.input.low;
|
||||
family = x->outer_mode->afinfo->family;
|
||||
goto resume;
|
||||
}
|
||||
|
||||
daddr = (xfrm_address_t *)(skb_network_header(skb) +
|
||||
XFRM_SPI_SKB_CB(skb)->daddroff);
|
||||
family = XFRM_SPI_SKB_CB(skb)->family;
|
||||
|
||||
/* Allocate new secpath or COW existing one. */
|
||||
if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
|
||||
struct sec_path *sp;
|
||||
@ -137,10 +142,6 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
|
||||
skb->sp = sp;
|
||||
}
|
||||
|
||||
daddr = (xfrm_address_t *)(skb_network_header(skb) +
|
||||
XFRM_SPI_SKB_CB(skb)->daddroff);
|
||||
family = XFRM_SPI_SKB_CB(skb)->family;
|
||||
|
||||
seq = 0;
|
||||
if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
|
||||
XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
|
||||
@ -201,7 +202,6 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
|
||||
|
||||
if (nexthdr == -EINPROGRESS)
|
||||
return 0;
|
||||
|
||||
resume:
|
||||
spin_lock(&x->lock);
|
||||
if (nexthdr <= 0) {
|
||||
@ -263,6 +263,10 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
|
||||
}
|
||||
} while (!err);
|
||||
|
||||
err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
|
||||
if (err)
|
||||
goto drop;
|
||||
|
||||
nf_reset(skb);
|
||||
|
||||
if (decaps) {
|
||||
@ -276,6 +280,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
|
||||
drop_unlock:
|
||||
spin_unlock(&x->lock);
|
||||
drop:
|
||||
xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
|
||||
kfree_skb(skb);
|
||||
return 0;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user