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np_ip.c
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np_ip.c
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/*****************************************************************************
@(#) File: src/drivers/np_ip.c
-----------------------------------------------------------------------------
Copyright (c) 2008-2020 Monavacon Limited <http://www.monavacon.com/>
Copyright (c) 2001-2008 OpenSS7 Corporation <http://www.openss7.com/>
Copyright (c) 1997-2001 Brian F. G. Bidulock <bidulock@openss7.org>
All Rights Reserved.
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU Affero General Public License as published by the Free
Software Foundation, version 3 of the license.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>, or
write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA
02139, USA.
-----------------------------------------------------------------------------
U.S. GOVERNMENT RESTRICTED RIGHTS. If you are licensing this Software on
behalf of the U.S. Government ("Government"), the following provisions apply
to you. If the Software is supplied by the Department of Defense ("DoD"), it
is classified as "Commercial Computer Software" under paragraph 252.227-7014
of the DoD Supplement to the Federal Acquisition Regulations ("DFARS") (or any
successor regulations) and the Government is acquiring only the license rights
granted herein (the license rights customarily provided to non-Government
users). If the Software is supplied to any unit or agency of the Government
other than DoD, it is classified as "Restricted Computer Software" and the
Government's rights in the Software are defined in paragraph 52.227-19 of the
Federal Acquisition Regulations ("FAR") (or any successor regulations) or, in
the cases of NASA, in paragraph 18.52.227-86 of the NASA Supplement to the FAR
(or any successor regulations).
-----------------------------------------------------------------------------
Commercial licensing and support of this software is available from OpenSS7
Corporation at a fee. See http://www.openss7.com/
*****************************************************************************/
static char const ident[] = "src/drivers/np_ip.c (" PACKAGE_ENVR ") " PACKAGE_DATE;
/*
* This driver provides the functionality of an IP (Internet Protocol) hook similar to raw sockets,
* with the exception that the hook acts as a port bound intercept for IP packets for the bound
* protocol ids. This dirver is used primarily by OpenSS7 protocol test module (e.g. for SCTP) and
* for applications where entire ranges of port numbers for an existing protocol id must be
* intercepted (e.g. for RTP/RTCP). This driver uses hook into the Linux IP protocol tables and
* passes packets tranparently on to the underlying protocol in which it is not interested (bound).
* The driver uses the NPI (Network Provider Interface) API.
*/
#define _SVR4_SOURCE 1
#include <sys/os7/compat.h>
#ifdef LINUX
#undef ASSERT
#include <linux/bitops.h>
#define np_tst_bit(nr,addr) test_bit(nr,addr)
#define np_set_bit(nr,addr) __set_bit(nr,addr)
#define np_clr_bit(nr,addr) __clear_bit(nr,addr)
#include <linux/interrupt.h>
#ifdef HAVE_KINC_LINUX_BRLOCK_H
#include <linux/brlock.h>
#endif
#include <linux/udp.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/route.h>
#include <net/inet_ecn.h>
#include <net/snmp.h>
#include <net/udp.h>
#ifdef HAVE_KINC_NET_DST_H
#include <net/dst.h>
#endif
#include <net/protocol.h>
#include <linux/skbuff.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#endif /* LINUX */
#include "net_hooks.h"
#include <sys/npi.h>
#include <sys/npi_ip.h>
#define NP_DESCRIP "Internet Protocol (IP) Network Provider (NP_IP) STREAMS Driver"
#define NP_EXTRA "Part of the OpenSS7 stack for Linux Fast-STREAMS"
#define NP_COPYRIGHT "Copyright (c) 2008-2020 Monavacon Limited. All Rights Reserved."
#define NP_REVISION "OpenSS7 src/drivers/np_ip.c (" PACKAGE_ENVR ") " PACKAGE_DATE
#define NP_DEVICE "SVR 4.2 MP STREAMS NPI NP_IP Network Provider"
#define NP_CONTACT "Brian Bidulock <bidulock@openss7.org>"
#define NP_LICENSE "GPL"
#define NP_BANNER NP_DESCRIP "\n" \
NP_EXTRA "\n" \
NP_REVISION "\n" \
NP_COPYRIGHT "\n" \
NP_DEVICE "\n" \
NP_CONTACT
#define NP_SPLASH NP_DESCRIP "\n" \
NP_REVISION
#ifdef LINUX
MODULE_AUTHOR(NP_CONTACT);
MODULE_DESCRIPTION(NP_DESCRIP);
MODULE_SUPPORTED_DEVICE(NP_DEVICE);
#ifdef MODULE_LICENSE
MODULE_LICENSE(NP_LICENSE);
#endif /* MODULE_LICENSE */
#ifdef MODULE_ALIAS
MODULE_ALIAS("streams-np_ip");
#endif /* MODULE_ALIAS */
#ifdef MODULE_VERSION
MODULE_VERSION(PACKAGE_ENVR);
#endif
#endif /* LINUX */
#define NP_DRV_ID CONFIG_STREAMS_NP_IP_MODID
#define NP_DRV_NAME CONFIG_STREAMS_NP_IP_NAME
#define NP_CMAJORS CONFIG_STREAMS_NP_IP_NMAJORS
#define NP_CMAJOR_0 CONFIG_STREAMS_NP_IP_MAJOR
#define NP_UNITS CONFIG_STREAMS_NP_IP_NMINORS
#ifdef LINUX
#ifdef MODULE_ALIAS
MODULE_ALIAS("streams-modid-" __stringify(CONFIG_STREAMS_NP_IP_MODID));
MODULE_ALIAS("streams-driver-np_ip");
MODULE_ALIAS("streams-major-" __stringify(CONFIG_STREAMS_NP_IP_MAJOR));
MODULE_ALIAS("/dev/streams/np_ip");
MODULE_ALIAS("/dev/streams/np_ip/*");
MODULE_ALIAS("/dev/streams/clone/np_ip");
MODULE_ALIAS("char-major-" __stringify(CONFIG_STREAMS_CLONE_MAJOR) "-" __stringify(NP_CMAJOR_0));
MODULE_ALIAS("/dev/np_ip");
//MODULE_ALIAS("devname:np_ip");
#endif /* defined MODULE_ALIAS */
#endif /* defined LINUX */
/*
* ==========================================================================
*
* STREAMS Definitions
*
* ==========================================================================
*/
#define DRV_ID NP_DRV_ID
#define DRV_NAME NP_DRV_NAME
#define CMAJORS NP_CMAJORS
#define CMAJOR_0 NP_CMAJOR_0
#define UNITS NP_UNITS
#ifdef MODULE
#define DRV_BANNER NP_BANNER
#else /* MODULE */
#define DRV_BANNER NP_SPLASH
#endif /* MODULE */
STATIC struct module_info np_minfo = {
.mi_idnum = DRV_ID, /* Module ID number */
.mi_idname = DRV_NAME, /* Module name */
.mi_minpsz = 0, /* Min packet size accepted */
.mi_maxpsz = (1 << 16), /* Max packet size accepted */
.mi_hiwat = (1 << 18), /* Hi water mark */
.mi_lowat = (1 << 16), /* Lo water mark */
};
STATIC struct module_stat np_rstat __attribute__ ((__aligned__(SMP_CACHE_BYTES)));
STATIC struct module_stat np_wstat __attribute__ ((__aligned__(SMP_CACHE_BYTES)));
/* Upper multiplex is a N provider following the NPI. */
STATIC streamscall int np_qopen(queue_t *, dev_t *, int, int, cred_t *);
STATIC streamscall int np_qclose(queue_t *, int, cred_t *);
streamscall int np_rput(queue_t *, mblk_t *);
streamscall int np_rsrv(queue_t *);
STATIC struct qinit np_rinit = {
.qi_putp = np_rput, /* Read put procedure (message from below) */
.qi_srvp = np_rsrv, /* Read service procedure */
.qi_qopen = np_qopen, /* Each open */
.qi_qclose = np_qclose, /* Last close */
.qi_minfo = &np_minfo, /* Module information */
.qi_mstat = &np_rstat, /* Module statistics */
};
streamscall int np_wput(queue_t *, mblk_t *);
streamscall int np_wsrv(queue_t *);
STATIC struct qinit np_winit = {
.qi_putp = np_wput, /* Write put procedure (message from above) */
.qi_srvp = np_wsrv, /* Write service procedure */
.qi_minfo = &np_minfo, /* Module information */
.qi_mstat = &np_wstat, /* Module statistics */
};
MODULE_STATIC struct streamtab np_info = {
.st_rdinit = &np_rinit, /* Upper read queue */
.st_wrinit = &np_winit, /* Upper write queue */
};
#if !defined HAVE_KMEMB_STRUCT_SK_BUFF_TRANSPORT_HEADER
#if !defined HAVE_KFUNC_SKB_TRANSPORT_HEADER
static inline unsigned char *
skb_tail_pointer(const struct sk_buff *skb)
{
return skb->tail;
}
static inline unsigned char *
skb_end_pointer(const struct sk_buff *skb)
{
return skb->end;
}
static inline unsigned char *
skb_transport_header(const struct sk_buff *skb)
{
return skb->h.raw;
}
static inline unsigned char *
skb_network_header(const struct sk_buff *skb)
{
return skb->nh.raw;
}
static inline unsigned char *
skb_mac_header(const struct sk_buff *skb)
{
return skb->mac.raw;
}
static inline void
skb_reset_tail_pointer(struct sk_buff *skb)
{
skb->tail = skb->data;
}
static inline void
skb_reset_end_pointer(struct sk_buff *skb)
{
skb->end = skb->data;
}
static inline void
skb_reset_transport_header(struct sk_buff *skb)
{
skb->h.raw = skb->data;
}
static inline void
skb_reset_network_header(struct sk_buff *skb)
{
skb->nh.raw = skb->data;
}
static inline void
skb_reset_mac_header(struct sk_buff *skb)
{
skb->mac.raw = skb->data;
}
static inline void
skb_set_tail_pointer(struct sk_buff *skb, const int offset)
{
skb_reset_tail_pointer(skb);
skb->tail += offset;
}
static inline void
skb_set_transport_header(struct sk_buff *skb, const int offset)
{
skb_reset_transport_header(skb);
skb->h.raw += offset;
}
static inline void
skb_set_network_header(struct sk_buff *skb, const int offset)
{
skb_reset_network_header(skb);
skb->nh.raw += offset;
}
static inline void
skb_set_mac_header(struct sk_buff *skb, const int offset)
{
skb_reset_mac_header(skb);
skb->mac.raw += offset;
}
#endif /* !defined HAVE_KFUNC_SKB_TRANSPORT_HEADER */
#endif /* !defined HAVE_KMEMB_STRUCT_SK_BUFF_TRANSPORT_HEADER */
/*
* Primary data structures.
*/
struct np_bhash_bucket;
struct np_chash_bucket;
struct np_daddr {
uint32_t addr; /* IP address this destination */
uint32_t saddr; /* current source address */
unsigned char ttl; /* time to live, this destination */
unsigned char tos; /* type of service, this destination */
unsigned short mtu; /* maximum transfer unit this destination */
struct dst_entry *dst; /* route for this destination */
int oif; /* current interface */
};
struct np_saddr {
uint32_t addr; /* IP address this source */
};
struct np_baddr {
uint32_t addr; /* IP address this bind */
};
/* Private structure */
typedef struct np {
STR_DECLARATION (struct np); /* Stream declaration */
struct np *bnext; /* linkage for bind/list hash */
struct np **bprev; /* linkage for bind/list hash */
struct np_bhash_bucket *bhash; /* linkage for bind/list hash */
struct np *cnext; /* linkage for conn hash */
struct np **cprev; /* linkage for conn hash */
struct np_chash_bucket *chash; /* linkage for conn hash */
N_info_ack_t info; /* service provider information */
unsigned int BIND_flags; /* bind flags */
unsigned int CONN_flags; /* connect flags */
unsigned int CONIND_number; /* maximum number of outstanding connection indications */
bufq_t conq; /* connection indication queue */
bufq_t datq; /* data indication queue */
bufq_t resq; /* reset indication queue */
unsigned short pnum; /* number of bound protocol ids */
uint8_t protoids[16]; /* bound protocol ids */
unsigned short bnum; /* number of bound addresses */
unsigned short bport; /* bound port number (network order) */
struct np_baddr baddrs[8]; /* bound addresses */
unsigned short snum; /* number of source (connected) addresses */
unsigned short sport; /* source (connected) port number (network order) */
struct np_saddr saddrs[8]; /* source (connected) addresses */
unsigned short dnum; /* number of destination (connected) addresses */
unsigned short dport; /* destination (connected) port number (network order) */
struct np_daddr daddrs[8]; /* destination (connected) addresses */
struct N_qos_sel_info_ip qos; /* network service provider quality of service */
struct N_qos_range_info_ip qor; /* network service provider quality of service range */
} np_t;
#define PRIV(__q) (((__q)->q_ptr))
#define NP_PRIV(__q) ((struct np *)((__q)->q_ptr))
typedef struct df {
rwlock_t lock; /* structure lock */
SLIST_HEAD (np, np); /* master list of np (open) structures */
} df_t;
#if defined __RW_LOCK_UNLOCKED
static struct df master = {.lock = __RW_LOCK_UNLOCKED(master.lock), };
#elif defined RW_LOCK_UNLOCKED
static struct df master = {.lock = RW_LOCK_UNLOCKED, };
#else
#error cannot initialize read-write locks
#endif
/*
* Bind buckets, caches and hashes.
*/
struct np_bind_bucket {
struct np_bind_bucket *next; /* linkage of bind buckets for hash slot */
struct np_bind_bucket **prev; /* linkage of bind buckets for hash slot */
unsigned char proto; /* IP protocol identifier */
unsigned short port; /* port number (host order) */
struct np *owners; /* list of owners of this protocol/port combination */
struct np *dflt; /* default listeners/destinations for this protocol */
};
struct np_conn_bucket {
struct np_conn_bucket *next; /* linkage of conn buckets for hash slot */
struct np_conn_bucket **prev; /* linkage of conn buckets for hash slot */
unsigned char proto; /* IP protocol identifier */
unsigned short sport; /* source port number (network order) */
unsigned short dport; /* destination port number (network order) */
struct np *owners; /* list of owners of this protocol/sport/dport combination */
};
struct np_bhash_bucket {
rwlock_t lock;
struct np *list;
};
struct np_chash_bucket {
rwlock_t lock;
struct np *list;
};
STATIC struct np_bhash_bucket *np_bhash;
STATIC size_t np_bhash_size = 0;
STATIC size_t np_bhash_order = 0;
STATIC struct np_chash_bucket *np_chash;
STATIC size_t np_chash_size = 0;
STATIC size_t np_chash_order = 0;
STATIC INLINE fastcall __hot_in int
np_bhashfn(unsigned char proto, unsigned short bport)
{
return ((np_bhash_size - 1) & (proto + bport));
}
STATIC INLINE fastcall __unlikely int
np_chashfn(unsigned char proto, unsigned short sport, unsigned short dport)
{
return ((np_chash_size - 1) & (proto + sport + dport));
}
#if defined HAVE_KTYPE_STRUCT_NET_PROTOCOL
#define mynet_protocol net_protocol
#endif /* defined HAVE_KTYPE_STRUCT_NET_PROTOCOL */
#if defined HAVE_KTYPE_STRUCT_INET_PROTOCOL
#define mynet_protocol inet_protocol
#endif /* defined HAVE_KTYPE_STRUCT_INET_PROTOCOL */
struct ipnet_protocol {
struct mynet_protocol proto;
struct mynet_protocol *next;
struct module *kmod;
};
struct np_prot_bucket {
unsigned char proto; /* protocol number */
int refs; /* reference count */
int corefs; /* N_CONS references */
int clrefs; /* N_CLNS references */
struct ipnet_protocol prot; /* Linux registration structure */
};
#if defined DEFINE_RWLOCK
STATIC DEFINE_RWLOCK(np_prot_lock);
#elif defined __RW_LOCK_UNLOCKED
STATIC rwlock_t np_prot_lock = __RW_LOCK_UNLOCKED(np_prot_lock);
#elif defined RW_LOCK_UNLOCKED
STATIC rwlock_t np_prot_lock = RW_LOCK_UNLOCKED;
#else
#error cannot initialize read-write locks
#endif
STATIC struct np_prot_bucket *np_prots[256];
STATIC kmem_cachep_t np_prot_cachep;
STATIC kmem_cachep_t np_priv_cachep;
static INLINE struct np *
np_get(struct np *np)
{
dassert(np != NULL);
atomic_inc(&np->refcnt);
return (np);
}
static INLINE __hot void
np_put(struct np *np)
{
dassert(np != NULL);
if (atomic_dec_and_test(&np->refcnt)) {
kmem_cache_free(np_priv_cachep, np);
}
}
static INLINE fastcall __hot void
np_release(struct np **npp)
{
struct np *np;
dassert(npp != NULL);
if (likely((np = XCHG(npp, NULL)) != NULL))
np_put(np);
}
static INLINE struct np *
np_alloc(void)
{
struct np *np;
if ((np = kmem_cache_alloc(np_priv_cachep, GFP_ATOMIC))) {
bzero(np, sizeof(*np));
atomic_set(&np->refcnt, 1);
spin_lock_init(&np->lock); /* "np-lock" */
np->priv_put = &np_put;
np->priv_get = &np_get;
// np->type = 0;
// np->id = 0;
// np->state = 0;
// np->flags = 0;
}
return (np);
}
/*
* Locking
*/
/* Must always be bottom-half versions to avoid lock badness. But give these
* different names to avoid conflict with generic definitions. */
//#if defined CONFIG_STREAMS_NOIRQ || defined CONFIG_STREAMS_TEST
#if 1
#define spin_lock_str2(__lkp, __flags) \
do { (void)__flags; spin_lock_bh(__lkp); } while (0)
#define spin_unlock_str2(__lkp, __flags) \
do { (void)__flags; spin_unlock_bh(__lkp); } while (0)
#define write_lock_str2(__lkp, __flags) \
do { (void)__flags; write_lock_bh(__lkp); } while (0)
#define write_unlock_str2(__lkp, __flags) \
do { (void)__flags; write_unlock_bh(__lkp); } while (0)
#define read_lock_str2(__lkp, __flags) \
do { (void)__flags; read_lock_bh(__lkp); } while (0)
#define read_unlock_str2(__lkp, __flags) \
do { (void)__flags; read_unlock_bh(__lkp); } while (0)
#define local_save_str2(__flags) \
do { (void)__flags; local_bh_disable(); } while (0)
#define local_restore_str2(__flags) \
do { (void)__flags; local_bh_enable(); } while (0)
#else
#define spin_lock_str2(__lkp, __flags) \
spin_lock_irqsave(__lkp, __flags)
#define spin_unlock_str2(__lkp, __flags) \
spin_unlock_irqrestore(__lkp, __flags)
#define write_lock_str2(__lkp, __flags) \
write_lock_irqsave(__lkp, __flags)
#define write_unlock_str2(__lkp, __flags) \
write_unlock_irqrestore(__lkp, __flags)
#define read_lock_str2(__lkp, __flags) \
read_lock_irqsave(__lkp, __flags)
#define read_unlock_str2(__lkp, __flags) \
read_unlock_irqrestore(__lkp, __flags)
#define local_save_str2(__flags) \
local_irq_save(__flags)
#define local_restore_str2(__flags) \
local_irq_restore(__flags)
#endif
/*
* Buffer allocation
*/
STATIC streamscall __unlikely void
np_bufsrv(long data)
{
str_t *s;
queue_t *q;
q = (queue_t *) data;
ensure(q, return);
s = STR_PRIV(q);
ensure(s, return);
if (q == s->iq) {
if (xchg(&s->ibid, 0) != 0)
atomic_dec(&s->refcnt);
qenable(q);
return;
}
if (q == s->oq) {
if (xchg(&s->obid, 0) != 0)
atomic_dec(&s->refcnt);
qenable(q);
return;
}
return;
}
noinline fastcall __unlikely void
np_unbufcall(str_t * s)
{
bufcall_id_t bid;
if ((bid = xchg(&s->ibid, 0))) {
unbufcall(bid);
atomic_dec(&s->refcnt);
}
if ((bid = xchg(&s->obid, 0))) {
unbufcall(bid);
atomic_dec(&s->refcnt);
}
}
noinline fastcall __unlikely void
np_bufcall(queue_t *q, size_t size, int prior)
{
if (q) {
str_t *s = STR_PRIV(q);
bufcall_id_t bid, *bidp = NULL;
if (q == s->iq)
bidp = &s->ibid;
if (q == s->oq)
bidp = &s->obid;
if (bidp) {
atomic_inc(&s->refcnt);
if ((bid = xchg(bidp, bufcall(size, prior, &np_bufsrv, (long) q)))) {
unbufcall(bid); /* Unsafe on LiS without atomic exchange above. */
atomic_dec(&s->refcnt);
}
return;
}
}
swerr();
return;
}
STATIC INLINE fastcall __unlikely mblk_t *
np_allocb(queue_t *q, size_t size, int prior)
{
mblk_t *mp;
if (likely((mp = allocb(size, prior)) != NULL))
return (mp);
rare();
np_bufcall(q, size, prior);
return (mp);
}
STATIC INLINE fastcall __unlikely mblk_t *
np_dupmsg(queue_t *q, mblk_t *bp)
{
mblk_t *mp;
if (likely((mp = dupmsg(bp)) != NULL))
return (mp);
rare();
np_bufcall(q, msgsize(bp), BPRI_MED);
return (mp);
}
/*
* =========================================================================
*
* State Changes
*
* =========================================================================
*/
/* State flags */
#ifndef NSF_UNBND
#define NSF_UNBND (1 << NS_UNBND )
#define NSF_WACK_BREQ (1 << NS_WACK_BREQ )
#define NSF_WACK_UREQ (1 << NS_WACK_UREQ )
#define NSF_IDLE (1 << NS_IDLE )
#ifdef NS_WACK_OPTREQ
#define NSF_WACK_OPTREQ (1 << NS_WACK_OPTREQ )
#endif
#define NSF_WACK_RRES (1 << NS_WACK_RRES )
#define NSF_WCON_CREQ (1 << NS_WCON_CREQ )
#define NSF_WRES_CIND (1 << NS_WRES_CIND )
#define NSF_WACK_CRES (1 << NS_WACK_CRES )
#define NSF_DATA_XFER (1 << NS_DATA_XFER )
#define NSF_WCON_RREQ (1 << NS_WCON_RREQ )
#define NSF_WRES_RIND (1 << NS_WRES_RIND )
#define NSF_WACK_DREQ6 (1 << NS_WACK_DREQ6 )
#define NSF_WACK_DREQ7 (1 << NS_WACK_DREQ7 )
#define NSF_WACK_DREQ9 (1 << NS_WACK_DREQ9 )
#define NSF_WACK_DREQ10 (1 << NS_WACK_DREQ10 )
#define NSF_WACK_DREQ11 (1 << NS_WACK_DREQ11 )
#define NSF_NOSTATES (1 << NS_NOSTATES )
#endif
/* State masks */
#define NSM_ALLSTATES (NSF_NOSTATES - 1)
#define NSM_WACK_DREQ (NSF_WACK_DREQ6 \
|NSF_WACK_DREQ7 \
|NSF_WACK_DREQ9 \
|NSF_WACK_DREQ10 \
|NSF_WACK_DREQ11)
#define NSM_LISTEN (NSF_IDLE \
|NSF_WRES_CIND)
#define NSM_CONNECTED (NSF_WCON_CREQ\
|NSF_WRES_CIND\
|NSF_DATA_XFER\
|NSF_WCON_RREQ\
|NSF_WRES_RIND)
#define NSM_DISCONN (NSF_IDLE\
|NSF_UNBND)
#define NSM_INDATA (NSF_DATA_XFER\
|NSF_WCON_RREQ)
#define NSM_OUTDATA (NSF_DATA_XFER\
|NSF_WRES_RIND)
#ifndef N_PROVIDER
#define N_PROVIDER 0
#define N_USER 1
#endif
#ifdef CONFIG_STREAMS_DEBUG
STATIC const char *
np_state_name(np_ulong state)
{
switch (state) {
case NS_UNBND:
return ("NS_UNBND");
case NS_WACK_BREQ:
return ("NS_WACK_BREQ");
case NS_WACK_UREQ:
return ("NS_WACK_UREQ");
case NS_IDLE:
return ("NS_IDLE");
case NS_WACK_OPTREQ:
return ("NS_WACK_OPTREQ");
case NS_WACK_RRES:
return ("NS_WACK_RRES");
case NS_WCON_CREQ:
return ("NS_WCON_CREQ");
case NS_WRES_CIND:
return ("NS_WRES_CIND");
case NS_WACK_CRES:
return ("NS_WACK_CRES");
case NS_DATA_XFER:
return ("NS_DATA_XFER");
case NS_WCON_RREQ:
return ("NS_WCON_RREQ");
case NS_WRES_RIND:
return ("NS_WRES_RIND");
case NS_WACK_DREQ6:
return ("NS_WACK_DREQ6");
case NS_WACK_DREQ7:
return ("NS_WACK_DREQ7");
case NS_WACK_DREQ9:
return ("NS_WACK_DREQ9");
case NS_WACK_DREQ10:
return ("NS_WACK_DREQ10");
case NS_WACK_DREQ11:
return ("NS_WACK_DREQ11");
case NS_NOSTATES:
return ("NS_NOSTATES");
default:
return ("(unknown)");
}
}
#endif /* CONFIG_STREAMS_DEBUG */
/* State functions */
STATIC INLINE fastcall __unlikely void
np_set_state(struct np *np, const np_ulong state)
{
_printd(("%s: %p: %s <- %s\n", DRV_NAME, np, np_state_name(state),
np_state_name(np->info.CURRENT_state)));
np->info.CURRENT_state = state;
}
STATIC INLINE fastcall __unlikely np_ulong
np_get_state(const struct np *np)
{
return (np->info.CURRENT_state);
}
STATIC INLINE fastcall __unlikely np_ulong
np_chk_state(const struct np *np, const np_ulong mask)
{
return (((1 << np->info.CURRENT_state) & (mask)) != 0);
}
STATIC INLINE fastcall __unlikely np_ulong
np_not_state(const struct np *np, const np_ulong mask)
{
return (((1 << np->info.CURRENT_state) & (mask)) == 0);
}
#if 0
STATIC INLINE fastcall __unlikely long
np_get_statef(const struct np *np)
{
return (1 << np_get_state(np));
}
#endif
/*
* =========================================================================
*
* IP Local Management
*
* =========================================================================
*/
STATIC int np_v4_rcv(struct sk_buff *skb);
#if defined HAVE_NET_PROTOCOL_ERR_HANDLER_RETURNS_INT
STATIC int np_v4_err(struct sk_buff *skb, u32 info);
#else
STATIC void np_v4_err(struct sk_buff *skb, u32 info);
#endif
/*
* IP subsystem management
*/
#ifdef LINUX
/**
* np_v4_rcv_next - pass a socket buffer to the next handler
* @skb: socket buffer to pass
*
* In the Linux packet handler, if the packet is not for us, pass it to the next handler. If there
* is no next handler, free the packet and return. Note that we do not have to lock the hash
* because we own it and are also holding a reference to any module owning the next handler. This
* function returns zero (0) if the packet has not or will not be seen by another packet handler,
* and one (1) if the packet has or will be seen by another packet handler. This return value is
* used to determine whether to generate ICMP errors or not.
*/
STATIC INLINE fastcall __hot_in int
np_v4_rcv_next(struct sk_buff *skb)
{
struct np_prot_bucket *pb;
struct mynet_protocol *pp;
struct iphdr *iph;
unsigned char proto;
iph = (typeof(iph)) skb_network_header(skb);
proto = iph->protocol;
if ((pb = np_prots[proto]) && (pp = pb->prot.next)) {
pp->handler(skb);
return (1);
}
kfree_skb(skb);
return (0);
}
/**
* np_v4_err_next - pass a socket buffer to the next error handler
* @skb: socket buffer to pass
*
* In the Linux packet error handler, if the packet is not for us, pass it to the next error
* handler. If there is no next error handler, simply return.
*/
STATIC INLINE fastcall __hot_in void
np_v4_err_next(struct sk_buff *skb, __u32 info)
{
struct np_prot_bucket *pb;
struct mynet_protocol *pp;
unsigned char proto;
proto = ((struct iphdr *) skb->data)->protocol;
if ((pb = np_prots[proto]) && (pp = pb->prot.next))
pp->err_handler(skb, info);
return;
}
/**
* np_init_nproto - initialize network protocol override
* @proto: the protocol to register or override
*
* This is the network protocol override function.
*
* This is complicated because we hack the inet protocol tables. If no other protocol was
* previously registered, this reduces to inet_add_protocol(). If there is a protocol previously
* registered, we take a reference on the kernel module owning the entry, if possible, and replace
* the entry with our own, saving a pointer to the previous entry for passing sk_bufs along that we
* are not interested in. Taking a module reference is particularly for things like SCTP, where
* unloading the module after protocol override would break things horribly. Taking the reference
* keeps the module from unloading (this works for OpenSS7 SCTP as well as lksctp).
*/
STATIC INLINE fastcall __unlikely struct np_prot_bucket *
np_init_nproto(unsigned char proto, unsigned int type)
{
struct np_prot_bucket *pb;
struct ipnet_protocol *pp;
struct mynet_protocol **ppp;
int hash = proto & (MAX_INET_PROTOS - 1);
write_lock_bh(&np_prot_lock);
if ((pb = np_prots[proto]) != NULL) {
pb->refs++;
switch (type) {
case N_CONS:
++pb->corefs;
break;
case N_CLNS:
++pb->clrefs;
break;
default:
swerr();
break;
}
} else if ((pb = kmem_cache_alloc(np_prot_cachep, GFP_ATOMIC))) {
bzero(pb, sizeof(*pb));
pb->refs = 1;
switch (type) {
case N_CONS:
pb->corefs = 1;
break;
case N_CLNS:
pb->clrefs = 1;
break;
default:
swerr();
break;
}
pp = &pb->prot;
#ifdef HAVE_KMEMB_STRUCT_INET_PROTOCOL_PROTOCOL
pp->proto.protocol = proto;
pp->proto.name = "streams-np_ip";
#endif
#if defined HAVE_KTYPE_STRUCT_NET_PROTOCOL_PROTO
pp->proto.proto = proto;
#endif /* defined HAVE_KTYPE_STRUCT_NET_PROTOCOL_PROTO */
#if defined HAVE_KMEMB_STRUCT_NET_PROTOCOL_NO_POLICY || defined HAVE_KMEMB_STRUCT_INET_PROTOCOL_NO_POLICY
pp->proto.no_policy = 1;
#endif
pp->proto.handler = &np_v4_rcv;
pp->proto.err_handler = &np_v4_err;
ppp = &inet_protosp[hash];
{
net_protocol_lock();
#ifdef HAVE_OLD_STYLE_INET_PROTOCOL
while (*ppp && (*ppp)->protocol != proto)
ppp = &(*ppp)->next;
#endif /* HAVE_OLD_STYLE_INET_PROTOCOL */
if (*ppp != NULL) {
#ifdef HAVE_KMEMB_STRUCT_INET_PROTOCOL_COPY
/* can only override last entry */
if ((*ppp)->copy != 0) {
__ptrace(("Cannot override copy entry\n"));
net_protocol_unlock();
write_unlock_bh(&np_prot_lock);
kmem_cache_free(np_prot_cachep, pb);
return (NULL);
}
#endif /* HAVE_KMEMB_STRUCT_INET_PROTOCOL_COPY */
if ((pp->kmod = streams_module_address((ulong) *ppp))
&& pp->kmod != THIS_MODULE) {
if (!try_module_get(pp->kmod)) {
__ptrace(("Cannot acquire module\n"));
net_protocol_unlock();
write_unlock_bh(&np_prot_lock);
kmem_cache_free(np_prot_cachep, pb);
return (NULL);
}
}
#if defined HAVE_KMEMB_STRUCT_NET_PROTOCOL_NEXT || defined HAVE_KMEMB_STRUCT_INET_PROTOCOL_NEXT
pp->proto.next = (*ppp)->next;
#endif
}
pp->next = xchg(ppp, &pp->proto);
net_protocol_unlock();
}
/* link into hash slot */
np_prots[proto] = pb;
}
write_unlock_bh(&np_prot_lock);
return (pb);
}
/**
* np_term_nproto - terminate network protocol override
* @proto: network protocol to terminate
*
* This is the network protocol restoration function.
*
* This is complicated and brittle. The module stuff here is just for ourselves (other kernel
* modules pulling the same trick) as Linux IP protocols are normally kernel resident. If a
* protocol was previously registered, restore the protocol's entry and drop the reference to its
* owning kernel module. If there was no protocol previously registered, this reduces to
* inet_del_protocol().
*/
STATIC INLINE fastcall __unlikely void
np_term_nproto(unsigned char proto, unsigned int type)
{
struct np_prot_bucket *pb;
write_lock_bh(&np_prot_lock);
if ((pb = np_prots[proto]) != NULL) {
switch (type) {
case N_CONS:
assure(pb->corefs > 0);
--pb->corefs;
break;
case N_CLNS:
assure(pb->clrefs > 0);
--pb->clrefs;
break;