/*-
* Copyright (c) 2025 Emmanuel Nyarko
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#ifdef _KERNEL
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: npf_socket.c,v 1.3 2025/06/02 13:19:27 joe Exp $");

#include <sys/param.h>
#include <sys/types.h>

#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/in_pcb.h>
#include <sys/socketvar.h>

#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_pcb.h>
#endif

#include "npf_impl.h"

extern  struct inpcbtable tcbtable;     /* head of queue of active tcpcb's */
extern  struct inpcbtable udbtable;

#if defined(INET6)
static struct socket *  npf_ip6_socket(npf_cache_t *, int);
#endif
static struct socket *  npf_ip_socket(npf_cache_t *, int);
static int              npf_match(uint8_t, uint32_t, uint32_t, uint32_t);

/*
* NPF process socket module
*/

int
npf_match_rid(rid_t *rid, uint32_t uid_lookup)
{
   return npf_match(rid->op, rid->id[0], rid->id[1], uid_lookup);
}

static int
npf_match(uint8_t op, uint32_t rid1, uint32_t rid2, uint32_t id_lp)
{
   switch (op) {
   case NPF_OP_IRG:
       return id_lp > rid1 && id_lp < rid2;
   case NPF_OP_XRG:
       return id_lp < rid1 || id_lp > rid2;
   case NPF_OP_EQ:
       return id_lp == rid1;
   case NPF_OP_NE:
       return id_lp != rid1;
   case NPF_OP_LT:
       return id_lp < rid1;
   case NPF_OP_LE:
       return id_lp <= rid1;
   case NPF_OP_GT:
       return id_lp > rid1;
   case NPF_OP_GE:
       return id_lp >= rid1;
   }
   return 0; /* never reached */
}

int
npf_socket_lookup_rid(npf_cache_t *npc, get_rid_t get_rid, uint32_t *rid, int dir)
{
   struct socket       *so = NULL;

   KASSERT(npf_iscached(npc, NPC_IP46));

   if (npf_iscached(npc, NPC_IP4)) {
       so = npf_ip_socket(npc, dir);
#if defined(INET6)
   } else if (npf_iscached(npc, NPC_IP6)) {
       so = npf_ip6_socket(npc, dir);
#endif
   }

   if (so == NULL || so->so_cred == NULL)
       return -1;

   *rid = get_rid(so->so_cred);
   return 0;
}

static struct socket *
npf_ip_socket(npf_cache_t *npc, int dir)
{
   struct inpcbtable   *tb = NULL;
   struct in_addr      saddr, daddr;
   uint16_t            sport, dport;
   struct socket               *so = NULL;
   struct inpcb                *inp = NULL;

#define in_pcbhashlookup(tbl, saddr, sport, daddr, dport) \
   inpcb_lookup(tbl, saddr, sport, daddr, dport, NULL)
#define in_pcblookup_listen(tbl, addr, port) \
   inpcb_lookup_bound(tbl, addr, port)

   KASSERT(npf_iscached(npc, NPC_LAYER4));
   KASSERT(npf_iscached(npc, NPC_IP4));

   struct tcphdr *tcp = npc->npc_l4.tcp;
   struct udphdr *udp = npc->npc_l4.udp;
   struct ip *ip = npc->npc_ip.v4;

   switch(npc->npc_proto) {
       case IPPROTO_TCP:
           sport = tcp->th_sport;
           dport = tcp->th_dport;
           tb = &tcbtable;
           break;
       case IPPROTO_UDP:
           sport = udp->uh_sport;
           dport = udp->uh_dport;
           tb = &udbtable;
           break;
       default:
           return NULL;
   }

   if (dir == PFIL_IN) {
       saddr = ip->ip_src;
       daddr = ip->ip_dst;
   } else {
       uint16_t p_temp;
       /* swap ports and addresses */
       p_temp = sport;
       sport = dport;
       dport = p_temp;
       saddr = ip->ip_dst;
       daddr = ip->ip_src;
   }

   inp = in_pcbhashlookup(tb, saddr, sport, daddr, dport);
   if (inp == NULL) {
       inp = in_pcblookup_listen(tb, daddr, dport);
       if (inp == NULL) {
           return NULL;
       }
   }

   so = inp->inp_socket;
   return so;
}

#if defined(INET6)
static struct socket *
npf_ip6_socket(npf_cache_t *npc, int dir)
{
   struct inpcbtable   *tb = NULL;
   const struct in6_addr       *s6addr, *d6addr;
   uint16_t    sport, dport;
   struct inpcb                *in6p = NULL;
   struct socket               *so = NULL;

#define in6_pcbhashlookup(tbl, saddr, sport, daddr, dport) \
   in6pcb_lookup(tbl, saddr, sport, daddr, dport, 0, NULL)

#define in6_pcblookup_listen(tbl, addr, port) \
   in6pcb_lookup_bound(tbl, addr, port, 0)

   KASSERT(npf_iscached(npc, NPC_LAYER4));
   KASSERT(npf_iscached(npc, NPC_IP6));

   struct tcphdr *tcp = npc->npc_l4.tcp;
   struct udphdr *udp = npc->npc_l4.udp;
   struct ip6_hdr *ip6 = npc->npc_ip.v6;

   switch(npc->npc_proto) {
       case IPPROTO_TCP:
           sport = tcp->th_sport;
           dport = tcp->th_dport;
           tb = &tcbtable;
           break;
       case IPPROTO_UDP:
           sport = udp->uh_sport;
           dport = udp->uh_dport;
           tb = &udbtable;
           break;
       default:
           return NULL;
   }

   if (dir == PFIL_IN) {
       s6addr = &ip6->ip6_src;
       d6addr = &ip6->ip6_dst;
   } else {
       uint16_t p_temp;
       /* swap ports and addresses */
       p_temp = sport;
       sport = dport;
       dport = p_temp;
       s6addr = &ip6->ip6_dst;
       d6addr = &ip6->ip6_src;
   }
   in6p = in6_pcbhashlookup(tb, s6addr, sport, d6addr,
       dport);
   if (in6p == NULL) {
       in6p = in6_pcblookup_listen(tb, d6addr, dport);
       if (in6p == NULL)
           return NULL;
   }
   so = in6p->inp_socket;
   return so;
}
#endif

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