4.3BSD - /usr/src/sys/netinet/raw_ip.c

   1: /*
   2:  * Copyright (c) 1982, 1986 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)raw_ip.c	7.1 (Berkeley) 6/5/86
   7:  */
   8: 
   9: #include "param.h"
  10: #include "mbuf.h"
  11: #include "socket.h"
  12: #include "protosw.h"
  13: #include "socketvar.h"
  14: #include "errno.h"
  15: 
  16: #include "../net/if.h"
  17: #include "../net/route.h"
  18: #include "../net/raw_cb.h"
  19: 
  20: #include "in.h"
  21: #include "in_systm.h"
  22: #include "ip.h"
  23: #include "ip_var.h"
  24: 
  25: /*
  26:  * Raw interface to IP protocol.
  27:  */
  28: 
  29: struct  sockaddr_in ripdst = { AF_INET };
  30: struct  sockaddr_in ripsrc = { AF_INET };
  31: struct  sockproto ripproto = { PF_INET };
  32: /*
  33:  * Setup generic address and protocol structures
  34:  * for raw_input routine, then pass them along with
  35:  * mbuf chain.
  36:  */
  37: rip_input(m)
  38:     struct mbuf *m;
  39: {
  40:     register struct ip *ip = mtod(m, struct ip *);
  41: 
  42:     ripproto.sp_protocol = ip->ip_p;
  43:     ripdst.sin_addr = ip->ip_dst;
  44:     ripsrc.sin_addr = ip->ip_src;
  45:     raw_input(m, &ripproto, (struct sockaddr *)&ripsrc,
  46:       (struct sockaddr *)&ripdst);
  47: }
  48: 
  49: /*
  50:  * Generate IP header and pass packet to ip_output.
  51:  * Tack on options user may have setup with control call.
  52:  */
  53: rip_output(m0, so)
  54:     struct mbuf *m0;
  55:     struct socket *so;
  56: {
  57:     register struct mbuf *m;
  58:     register struct ip *ip;
  59:     int len = 0, error;
  60:     struct rawcb *rp = sotorawcb(so);
  61:     struct sockaddr_in *sin;
  62: 
  63:     /*
  64: 	 * Calculate data length and get an mbuf
  65: 	 * for IP header.
  66: 	 */
  67:     for (m = m0; m; m = m->m_next)
  68:         len += m->m_len;
  69:     m = m_get(M_DONTWAIT, MT_HEADER);
  70:     if (m == 0) {
  71:         error = ENOBUFS;
  72:         goto bad;
  73:     }
  74: 
  75:     /*
  76: 	 * Fill in IP header as needed.
  77: 	 */
  78:     m->m_off = MMAXOFF - sizeof(struct ip);
  79:     m->m_len = sizeof(struct ip);
  80:     m->m_next = m0;
  81:     ip = mtod(m, struct ip *);
  82:     ip->ip_tos = 0;
  83:     ip->ip_off = 0;
  84:     ip->ip_p = rp->rcb_proto.sp_protocol;
  85:     ip->ip_len = sizeof(struct ip) + len;
  86:     if (rp->rcb_flags & RAW_LADDR) {
  87:         sin = (struct sockaddr_in *)&rp->rcb_laddr;
  88:         if (sin->sin_family != AF_INET) {
  89:             error = EAFNOSUPPORT;
  90:             goto bad;
  91:         }
  92:         ip->ip_src.s_addr = sin->sin_addr.s_addr;
  93:     } else
  94:         ip->ip_src.s_addr = 0;
  95:     ip->ip_dst = ((struct sockaddr_in *)&rp->rcb_faddr)->sin_addr;
  96:     ip->ip_ttl = MAXTTL;
  97:     return (ip_output(m, rp->rcb_options, &rp->rcb_route,
  98:        (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST));
  99: bad:
 100:     m_freem(m);
 101:     return (error);
 102: }
 103: 
 104: /*
 105:  * Raw IP socket option processing.
 106:  */
 107: rip_ctloutput(op, so, level, optname, m)
 108:     int op;
 109:     struct socket *so;
 110:     int level, optname;
 111:     struct mbuf **m;
 112: {
 113:     int error = 0;
 114:     register struct rawcb *rp = sotorawcb(so);
 115: 
 116:     if (level != IPPROTO_IP)
 117:         error = EINVAL;
 118:     else switch (op) {
 119: 
 120:     case PRCO_SETOPT:
 121:         switch (optname) {
 122:         case IP_OPTIONS:
 123:             return (ip_pcbopts(&rp->rcb_options, *m));
 124: 
 125:         default:
 126:             error = EINVAL;
 127:             break;
 128:         }
 129:         break;
 130: 
 131:     case PRCO_GETOPT:
 132:         switch (optname) {
 133:         case IP_OPTIONS:
 134:             *m = m_get(M_WAIT, MT_SOOPTS);
 135:             if (rp->rcb_options) {
 136:                 (*m)->m_off = rp->rcb_options->m_off;
 137:                 (*m)->m_len = rp->rcb_options->m_len;
 138:                 bcopy(mtod(rp->rcb_options, caddr_t),
 139:                     mtod(*m, caddr_t), (unsigned)(*m)->m_len);
 140:             } else
 141:                 (*m)->m_len = 0;
 142:             break;
 143:         default:
 144:             error = EINVAL;
 145:             break;
 146:         }
 147:         break;
 148:     }
 149:     if (op == PRCO_SETOPT)
 150:         (void)m_free(*m);
 151:     return (error);
 152: }

Defined functions

Defined variables