diff options
Diffstat (limited to 'contrib/isc-dhcp/common/bpf.c')
| -rw-r--r-- | contrib/isc-dhcp/common/bpf.c | 69 |
1 files changed, 54 insertions, 15 deletions
diff --git a/contrib/isc-dhcp/common/bpf.c b/contrib/isc-dhcp/common/bpf.c index e47aa1f..ba42a43 100644 --- a/contrib/isc-dhcp/common/bpf.c +++ b/contrib/isc-dhcp/common/bpf.c @@ -3,8 +3,8 @@ BPF socket interface code, originally contributed by Archie Cobbs. */ /* - * Copyright (c) 1995, 1996 The Internet Software Consortium. - * All rights reserved. + * Copyright (c) 1995, 1996, 1998, 1999 + * The Internet Software Consortium. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -42,22 +42,31 @@ #ifndef lint static char copyright[] = -"$Id: bpf.c,v 1.19 1997/10/20 21:47:13 mellon Exp $ Copyright (c) 1995, 1996 The Internet Software Consortium. All rights reserved.\n"; +"$Id: bpf.c,v 1.19.2.6 1999/02/09 04:46:59 mellon Exp $ Copyright (c) 1995, 1996, 1998, 1999 The Internet Software Consortium. All rights reserved.\n"; #endif /* not lint */ #include "dhcpd.h" -#if defined (USE_BPF_SEND) || defined (USE_BPF_RECEIVE) -#include <sys/ioctl.h> -#include <sys/uio.h> +#if defined (USE_BPF_SEND) || defined (USE_BPF_RECEIVE) \ + || defined (USE_LPF_RECEIVE) +# if defined (USE_LPF_RECEIVE) +# include <asm/types.h> +# include <linux/filter.h> +# define bpf_insn sock_filter /* Linux: dare to be gratuitously different. */ +# else +# include <sys/ioctl.h> +# include <sys/uio.h> + +# include <net/bpf.h> +# if defined (NEED_OSF_PFILT_HACKS) +# include <net/pfilt.h> +# endif +# endif -#include <net/bpf.h> -#ifdef NEED_OSF_PFILT_HACKS -#include <net/pfilt.h> -#endif #include <netinet/in_systm.h> #include "includes/netinet/ip.h" #include "includes/netinet/udp.h" #include "includes/netinet/if_ether.h" +#endif /* Reinitializes the specified interface after an address change. This is not required for packet-filter APIs. */ @@ -80,6 +89,7 @@ void if_reinitialize_receive (info) Opens a packet filter for each interface and adds it to the select mask. */ +#if defined (USE_BPF_SEND) || defined (USE_BPF_RECEIVE) int if_register_bpf (info) struct interface_info *info; { @@ -99,6 +109,11 @@ int if_register_bpf (info) if (errno == EBUSY) { continue; } else { + if (!b) + error ("No bpf devices.%s%s%s", + " Please read the README", + " section for your operating", + " system."); error ("Can't find free bpf: %m"); } } else { @@ -137,12 +152,12 @@ void if_register_send (info) } #endif /* USE_BPF_SEND */ -#ifdef USE_BPF_RECEIVE +#if defined (USE_BPF_RECEIVE) || defined (USE_LPF_RECEIVE) /* Packet filter program... XXX Changes to the filter program may require changes to the constant offsets used in if_register_send to patch the BPF program! XXX */ -struct bpf_insn filter [] = { +struct bpf_insn dhcp_bpf_filter [] = { /* Make sure this is an IP packet... */ BPF_STMT (BPF_LD + BPF_H + BPF_ABS, 12), BPF_JUMP (BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_IP, 0, 8), @@ -169,6 +184,10 @@ struct bpf_insn filter [] = { BPF_STMT(BPF_RET+BPF_K, 0), }; +int dhcp_bpf_filter_len = sizeof dhcp_bpf_filter / sizeof (struct bpf_insn); +#endif + +#if defined (USE_BPF_RECEIVE) void if_register_receive (info) struct interface_info *info; { @@ -220,13 +239,13 @@ void if_register_receive (info) info -> rbuf_len = 0; /* Set up the bpf filter program structure. */ - p.bf_len = sizeof filter / sizeof (struct bpf_insn); - p.bf_insns = filter; + p.bf_len = dhcp_bpf_filter_len; + p.bf_insns = dhcp_bpf_filter; /* Patch the server port into the BPF program... XXX changes to filter program may require changes to the insn number(s) used below! XXX */ - filter [8].k = ntohs (local_port); + dhcp_bpf_filter [8].k = ntohs (local_port); if (ioctl (info -> rfdesc, BIOCSETF, &p) < 0) error ("Can't install packet filter program: %m"); @@ -255,6 +274,10 @@ ssize_t send_packet (interface, packet, raw, len, from, to, hto) unsigned char buf [256]; struct iovec iov [2]; + if (!strcmp (interface -> name, "fallback")) + return send_fallback (interface, packet, raw, + len, from, to, hto); + /* Assemble the headers... */ assemble_hw_header (interface, buf, &bufp, hto); assemble_udp_ip_header (interface, buf, &bufp, from.s_addr, @@ -383,4 +406,20 @@ ssize_t receive_packet (interface, buf, len, from, hfrom) } while (!length); return 0; } + +int can_unicast_without_arp () +{ + return 1; +} + +void maybe_setup_fallback () +{ + struct interface_info *fbi; + fbi = setup_fallback (); + if (fbi) { + if_register_fallback (fbi); + add_protocol ("fallback", fallback_interface -> wfdesc, + fallback_discard, fallback_interface); + } +} #endif |
