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Diff for /src/sys/netinet/ip_input.c between version 1.353 and 1.354

version 1.353, 2017/03/31 06:42:19 version 1.354, 2017/03/31 06:49:44
Line 253  EVCNT_ATTACH_STATIC(ip_swcsum);
Line 253  EVCNT_ATTACH_STATIC(ip_swcsum);
 #endif /* INET_CSUM_COUNTERS */  #endif /* INET_CSUM_COUNTERS */
   
 /*  /*
  * We need to save the IP options in case a protocol wants to respond   * Used to save the IP options in case a protocol wants to respond
  * to an incoming packet over the same route if the packet got here   * to an incoming packet over the same route if the packet got here
  * using IP source routing.  This allows connection establishment and   * using IP source routing.  This allows connection establishment and
  * maintenance when the remote end is on a network that is not known   * maintenance when the remote end is on a network that is not known
  * to us.   * to us.
  */   */
   struct ip_srcrt {
 static int      ip_nhops = 0;          int             isr_nhops;                 /* number of hops */
           struct in_addr  isr_dst;                   /* final destination */
 static  struct ip_srcrt {          char            isr_nop;                   /* one NOP to align */
         struct  in_addr dst;                    /* final destination */          char            isr_hdr[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN & OFFSET */
         char    nop;                            /* one NOP to align */          struct in_addr  isr_routes[MAX_IPOPTLEN/sizeof(struct in_addr)];
         char    srcopt[IPOPT_OFFSET + 1];       /* OPTVAL, OLEN and OFFSET */  };
         struct  in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];  
 } ip_srcrt;  
   
 static int ip_drainwanted;  static int ip_drainwanted;
   
 static void save_rte(u_char *, struct in_addr);  static void save_rte(struct mbuf *, u_char *, struct in_addr);
   
 #ifdef MBUFTRACE  #ifdef MBUFTRACE
 struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");  struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
Line 664  ip_input(struct mbuf *m)
Line 662  ip_input(struct mbuf *m)
          * error was detected (causing an icmp message           * error was detected (causing an icmp message
          * to be sent and the original packet to be freed).           * to be sent and the original packet to be freed).
          */           */
         ip_nhops = 0;           /* for source routed packets */  
         if (hlen > sizeof (struct ip) && ip_dooptions(m)) {          if (hlen > sizeof (struct ip) && ip_dooptions(m)) {
                 m = NULL;                  m = NULL;
                 goto out;                  goto out;
Line 987  ip_dooptions(struct mbuf *m)
Line 984  ip_dooptions(struct mbuf *m)
                                 /*                                  /*
                                  * End of source route.  Should be for us.                                   * End of source route.  Should be for us.
                                  */                                   */
                                 save_rte(cp, ip->ip_src);                                  save_rte(m, cp, ip->ip_src);
                                 break;                                  break;
                         }                          }
                         /*                          /*
Line 1226  ip_rtaddr(struct in_addr dst, struct psr
Line 1223  ip_rtaddr(struct in_addr dst, struct psr
  * up later by ip_srcroute if the receiver is interested.   * up later by ip_srcroute if the receiver is interested.
  */   */
 static void  static void
 save_rte(u_char *option, struct in_addr dst)  save_rte(struct mbuf *m, u_char *option, struct in_addr dst)
 {  {
           struct ip_srcrt *isr;
           struct m_tag *mtag;
         unsigned olen;          unsigned olen;
   
         olen = option[IPOPT_OLEN];          olen = option[IPOPT_OLEN];
         if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))          if (olen > sizeof(isr->isr_hdr) + sizeof(isr->isr_routes))
                   return;
   
           mtag = m_tag_get(PACKET_TAG_SRCROUTE, sizeof(*isr), M_NOWAIT);
           if (mtag == NULL)
                 return;                  return;
         memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);          isr = (struct ip_srcrt *)(mtag + 1);
         ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);  
         ip_srcrt.dst = dst;          memcpy(isr->isr_hdr, option, olen);
           isr->isr_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
           isr->isr_dst = dst;
           m_tag_prepend(m, mtag);
 }  }
   
 /*  /*
Line 1244  save_rte(u_char *option, struct in_addr 
Line 1250  save_rte(u_char *option, struct in_addr 
  * The first hop is placed before the options, will be removed later.   * The first hop is placed before the options, will be removed later.
  */   */
 struct mbuf *  struct mbuf *
 ip_srcroute(void)  ip_srcroute(struct mbuf *m0)
 {  {
         struct in_addr *p, *q;          struct in_addr *p, *q;
         struct mbuf *m;          struct mbuf *m;
           struct ip_srcrt *isr;
           struct m_tag *mtag;
   
           mtag = m_tag_find(m0, PACKET_TAG_SRCROUTE, NULL);
           if (mtag == NULL)
                   return NULL;
           isr = (struct ip_srcrt *)(mtag + 1);
   
         if (ip_nhops == 0)          if (isr->isr_nhops == 0)
                 return NULL;                  return NULL;
   
         m = m_get(M_DONTWAIT, MT_SOOPTS);          m = m_get(M_DONTWAIT, MT_SOOPTS);
         if (m == 0)          if (m == NULL)
                 return NULL;                  return NULL;
   
         MCLAIM(m, &inetdomain.dom_mowner);          MCLAIM(m, &inetdomain.dom_mowner);
 #define OPTSIZ  (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))  #define OPTSIZ  (sizeof(isr->isr_nop) + sizeof(isr->isr_hdr))
   
         /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */          /* length is (nhops+1)*sizeof(addr) + sizeof(nop + header) */
         m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +          m->m_len = (isr->isr_nhops + 1) * sizeof(struct in_addr) + OPTSIZ;
             OPTSIZ;  
   
         /*          /*
          * First save first hop for return route           * First save first hop for return route
          */           */
         p = &ip_srcrt.route[ip_nhops - 1];          p = &(isr->isr_routes[isr->isr_nhops - 1]);
         *(mtod(m, struct in_addr *)) = *p--;          *(mtod(m, struct in_addr *)) = *p--;
   
         /*          /*
          * Copy option fields and padding (nop) to mbuf.           * Copy option fields and padding (nop) to mbuf.
          */           */
         ip_srcrt.nop = IPOPT_NOP;          isr->isr_nop = IPOPT_NOP;
         ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;          isr->isr_hdr[IPOPT_OFFSET] = IPOPT_MINOFF;
         memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,          memmove(mtod(m, char *) + sizeof(struct in_addr), &isr->isr_nop,
             OPTSIZ);              OPTSIZ);
         q = (struct in_addr *)(mtod(m, char *) +          q = (struct in_addr *)(mtod(m, char *) +
             sizeof(struct in_addr) + OPTSIZ);              sizeof(struct in_addr) + OPTSIZ);
Line 1282  ip_srcroute(void)
Line 1295  ip_srcroute(void)
          * Record return path as an IP source route,           * Record return path as an IP source route,
          * reversing the path (pointers are now aligned).           * reversing the path (pointers are now aligned).
          */           */
         while (p >= ip_srcrt.route) {          while (p >= isr->isr_routes) {
                 *q++ = *p--;                  *q++ = *p--;
         }          }
         /*          /*
          * Last hop goes to final destination.           * Last hop goes to final destination.
          */           */
         *q = ip_srcrt.dst;          *q = isr->isr_dst;
         return (m);          m_tag_delete(m0, mtag);
           return m;
 }  }
   
 const int inetctlerrmap[PRC_NCMDS] = {  const int inetctlerrmap[PRC_NCMDS] = {

Legend:
Removed from v.1.353  
changed lines
  Added in v.1.354

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