X-Git-Url: https://git.tcpdump.org/libpcap/blobdiff_plain/2dd3e0acd6d7e40d046113d562efea81b876f6fd..c980b57bc984223ff6b44f70b51e02ef8edea4cd:/pcap-dag.c diff --git a/pcap-dag.c b/pcap-dag.c index 03ba11af..ea1c0959 100644 --- a/pcap-dag.c +++ b/pcap-dag.c @@ -1,5 +1,5 @@ /* - * pcap-dag.c: Packet capture interface for Endace DAG card. + * pcap-dag.c: Packet capture interface for Emulex EndaceDAG cards. * * The functionality of this code attempts to mimic that of pcap-linux as much * as possible. This code is compiled in several different ways depending on @@ -10,14 +10,11 @@ * called as required from their pcap-linux/bpf equivalents. * * Authors: Richard Littin, Sean Irvine ({richard,sean}@reeltwo.com) - * Modifications: Jesper Peterson, Koryn Grant + * Modifications: Jesper Peterson + * Koryn Grant + * Stephen Donnelly */ -#ifndef lint -static const char rcsid[] _U_ = - "@(#) $Header: /tcpdump/master/libpcap/pcap-dag.c,v 1.20 2005-01-21 10:11:39 guy Exp $ (LBL)"; -#endif - #ifdef HAVE_CONFIG_H #include "config.h" #endif @@ -43,12 +40,127 @@ struct rtentry; /* declarations in */ #include "dagnew.h" #include "dagapi.h" +#include "dagpci.h" + +#include "pcap-dag.h" + +/* + * DAG devices have names beginning with "dag", followed by a number + * from 0 to DAG_MAX_BOARDS, then optionally a colon and a stream number + * from 0 to DAG_STREAM_MAX. + */ +#ifndef DAG_MAX_BOARDS +#define DAG_MAX_BOARDS 32 +#endif + + +#ifndef TYPE_AAL5 +#define TYPE_AAL5 4 +#endif + +#ifndef TYPE_MC_HDLC +#define TYPE_MC_HDLC 5 +#endif + +#ifndef TYPE_MC_RAW +#define TYPE_MC_RAW 6 +#endif + +#ifndef TYPE_MC_ATM +#define TYPE_MC_ATM 7 +#endif + +#ifndef TYPE_MC_RAW_CHANNEL +#define TYPE_MC_RAW_CHANNEL 8 +#endif + +#ifndef TYPE_MC_AAL5 +#define TYPE_MC_AAL5 9 +#endif + +#ifndef TYPE_COLOR_HDLC_POS +#define TYPE_COLOR_HDLC_POS 10 +#endif + +#ifndef TYPE_COLOR_ETH +#define TYPE_COLOR_ETH 11 +#endif + +#ifndef TYPE_MC_AAL2 +#define TYPE_MC_AAL2 12 +#endif + +#ifndef TYPE_IP_COUNTER +#define TYPE_IP_COUNTER 13 +#endif + +#ifndef TYPE_TCP_FLOW_COUNTER +#define TYPE_TCP_FLOW_COUNTER 14 +#endif + +#ifndef TYPE_DSM_COLOR_HDLC_POS +#define TYPE_DSM_COLOR_HDLC_POS 15 +#endif + +#ifndef TYPE_DSM_COLOR_ETH +#define TYPE_DSM_COLOR_ETH 16 +#endif + +#ifndef TYPE_COLOR_MC_HDLC_POS +#define TYPE_COLOR_MC_HDLC_POS 17 +#endif + +#ifndef TYPE_AAL2 +#define TYPE_AAL2 18 +#endif + +#ifndef TYPE_COLOR_HASH_POS +#define TYPE_COLOR_HASH_POS 19 +#endif + +#ifndef TYPE_COLOR_HASH_ETH +#define TYPE_COLOR_HASH_ETH 20 +#endif + +#ifndef TYPE_INFINIBAND +#define TYPE_INFINIBAND 21 +#endif + +#ifndef TYPE_IPV4 +#define TYPE_IPV4 22 +#endif + +#ifndef TYPE_IPV6 +#define TYPE_IPV6 23 +#endif + +#ifndef TYPE_RAW_LINK +#define TYPE_RAW_LINK 24 +#endif + +#ifndef TYPE_INFINIBAND_LINK +#define TYPE_INFINIBAND_LINK 25 +#endif + +#ifndef TYPE_PAD +#define TYPE_PAD 48 +#endif -#define MIN_DAG_SNAPLEN 12 -#define MAX_DAG_SNAPLEN 2040 #define ATM_CELL_SIZE 52 #define ATM_HDR_SIZE 4 +/* + * A header containing additional MTP information. + */ +#define MTP2_SENT_OFFSET 0 /* 1 byte */ +#define MTP2_ANNEX_A_USED_OFFSET 1 /* 1 byte */ +#define MTP2_LINK_NUMBER_OFFSET 2 /* 2 bytes */ +#define MTP2_HDR_LEN 4 /* length of the header */ + +#define MTP2_ANNEX_A_NOT_USED 0 +#define MTP2_ANNEX_A_USED 1 +#define MTP2_ANNEX_A_USED_UNKNOWN 2 + /* SunATM pseudo header */ struct sunatm_hdr { unsigned char flags; /* destination and traffic type */ @@ -56,6 +168,27 @@ struct sunatm_hdr { unsigned short vci; /* VCI */ }; +/* + * Private data for capturing on DAG devices. + */ +struct pcap_dag { + struct pcap_stat stat; +#ifdef HAVE_DAG_STREAMS_API + u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */ + u_char *dag_mem_top; /* DAG card current memory top pointer */ +#else /* HAVE_DAG_STREAMS_API */ + void *dag_mem_base; /* DAG card memory base address */ + u_int dag_mem_bottom; /* DAG card current memory bottom offset */ + u_int dag_mem_top; /* DAG card current memory top offset */ +#endif /* HAVE_DAG_STREAMS_API */ + int dag_fcs_bits; /* Number of checksum bits from link layer */ + int dag_offset_flags; /* Flags to pass to dag_offset(). */ + int dag_stream; /* DAG stream number */ + int dag_timeout; /* timeout specified to pcap_open_live. + * Same as in linux above, introduce + * generally? */ +}; + typedef struct pcap_dag_node { struct pcap_dag_node *next; pcap_t *p; @@ -68,28 +201,9 @@ static const unsigned short endian_test_word = 0x0100; #define IS_BIGENDIAN() (*((unsigned char *)&endian_test_word)) -/* - * Swap byte ordering of unsigned long long timestamp on a big endian - * machine. - */ -#define SWAP_TS(ull) ((ull & 0xff00000000000000LL) >> 56) | \ - ((ull & 0x00ff000000000000LL) >> 40) | \ - ((ull & 0x0000ff0000000000LL) >> 24) | \ - ((ull & 0x000000ff00000000LL) >> 8) | \ - ((ull & 0x00000000ff000000LL) << 8) | \ - ((ull & 0x0000000000ff0000LL) << 24) | \ - ((ull & 0x000000000000ff00LL) << 40) | \ - ((ull & 0x00000000000000ffLL) << 56) - - -#ifdef DAG_ONLY -/* This code is required when compiling for a DAG device only. */ -#include "pcap-dag.h" +#define MAX_DAG_PACKET 65536 -/* Replace dag function names with pcap equivalent. */ -#define dag_open_live pcap_open_live -#define dag_platform_finddevs pcap_platform_finddevs -#endif /* DAG_ONLY */ +static unsigned char TempPkt[MAX_DAG_PACKET]; static int dag_setfilter(pcap_t *p, struct bpf_program *fp); static int dag_stats(pcap_t *p, struct pcap_stat *ps); @@ -121,27 +235,27 @@ delete_pcap_dag(pcap_t *p) */ static void -dag_platform_close(pcap_t *p) +dag_platform_cleanup(pcap_t *p) { + struct pcap_dag *pd = p->priv; -#ifdef linux - if (p != NULL && p->md.device != NULL) { - if(dag_stop(p->fd) < 0) - fprintf(stderr,"dag_stop %s: %s\n", p->md.device, strerror(errno)); - if(dag_close(p->fd) < 0) - fprintf(stderr,"dag_close %s: %s\n", p->md.device, strerror(errno)); - - free(p->md.device); - } +#ifdef HAVE_DAG_STREAMS_API + if(dag_stop_stream(p->fd, pd->dag_stream) < 0) + fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno)); + + if(dag_detach_stream(p->fd, pd->dag_stream) < 0) + fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno)); #else - if (p != NULL) { - if(dag_stop(p->fd) < 0) - fprintf(stderr,"dag_stop: %s\n", strerror(errno)); + if(dag_stop(p->fd) < 0) + fprintf(stderr,"dag_stop: %s\n", strerror(errno)); +#endif /* HAVE_DAG_STREAMS_API */ + if(p->fd != -1) { if(dag_close(p->fd) < 0) fprintf(stderr,"dag_close: %s\n", strerror(errno)); + p->fd = -1; } -#endif delete_pcap_dag(p); + pcap_cleanup_live_common(p); /* Note: don't need to call close(p->fd) here as dag_close(p->fd) does this. */ } @@ -150,7 +264,8 @@ atexit_handler(void) { while (pcap_dags != NULL) { if (pcap_dags->pid == getpid()) { - dag_platform_close(pcap_dags->p); + if (pcap_dags->p != NULL) + dag_platform_cleanup(pcap_dags->p); } else { delete_pcap_dag(pcap_dags->p); } @@ -180,6 +295,38 @@ new_pcap_dag(pcap_t *p) return 0; } +static unsigned int +dag_erf_ext_header_count(uint8_t * erf, size_t len) +{ + uint32_t hdr_num = 0; + uint8_t hdr_type; + + /* basic sanity checks */ + if ( erf == NULL ) + return 0; + if ( len < 16 ) + return 0; + + /* check if we have any extension headers */ + if ( (erf[8] & 0x80) == 0x00 ) + return 0; + + /* loop over the extension headers */ + do { + + /* sanity check we have enough bytes */ + if ( len < (24 + (hdr_num * 8)) ) + return hdr_num; + + /* get the header type */ + hdr_type = erf[(16 + (hdr_num * 8))]; + hdr_num++; + + } while ( hdr_type & 0x80 ); + + return hdr_num; +} + /* * Read at most max_packets from the capture stream and call the callback * for each of them. Returns the number of packets handled, -1 if an @@ -188,90 +335,217 @@ new_pcap_dag(pcap_t *p) static int dag_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) { + struct pcap_dag *pd = p->priv; unsigned int processed = 0; - int flags = p->md.dag_offset_flags; + int flags = pd->dag_offset_flags; unsigned int nonblocking = flags & DAGF_NONBLOCK; + unsigned int num_ext_hdr = 0; + unsigned int ticks_per_second; - for (;;) - { - /* Get the next bufferful of packets (if necessary). */ - while (p->md.dag_mem_top - p->md.dag_mem_bottom < dag_record_size) { - + /* Get the next bufferful of packets (if necessary). */ + while (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size) { + + /* + * Has "pcap_breakloop()" been called? + */ + if (p->break_loop) { /* - * Has "pcap_breakloop()" been called? + * Yes - clear the flag that indicates that + * it has, and return -2 to indicate that + * we were told to break out of the loop. */ - if (p->break_loop) { - /* - * Yes - clear the flag that indicates that - * it has, and return -2 to indicate that - * we were told to break out of the loop. - */ - p->break_loop = 0; - return -2; - } + p->break_loop = 0; + return -2; + } - p->md.dag_mem_top = dag_offset(p->fd, &(p->md.dag_mem_bottom), flags); - if (nonblocking && (p->md.dag_mem_top - p->md.dag_mem_bottom < dag_record_size)) - { - /* Pcap is configured to process only available packets, and there aren't any. */ - return 0; - } +#ifdef HAVE_DAG_STREAMS_API + /* dag_advance_stream() will block (unless nonblock is called) + * until 64kB of data has accumulated. + * If to_ms is set, it will timeout before 64kB has accumulated. + * We wait for 64kB because processing a few packets at a time + * can cause problems at high packet rates (>200kpps) due + * to inefficiencies. + * This does mean if to_ms is not specified the capture may 'hang' + * for long periods if the data rate is extremely slow (<64kB/sec) + * If non-block is specified it will return immediately. The user + * is then responsible for efficiency. + */ + if ( NULL == (pd->dag_mem_top = dag_advance_stream(p->fd, pd->dag_stream, &(pd->dag_mem_bottom))) ) { + return -1; + } +#else + /* dag_offset does not support timeouts */ + pd->dag_mem_top = dag_offset(p->fd, &(pd->dag_mem_bottom), flags); +#endif /* HAVE_DAG_STREAMS_API */ + + if (nonblocking && (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size)) + { + /* Pcap is configured to process only available packets, and there aren't any, return immediately. */ + return 0; + } + + if(!nonblocking && + pd->dag_timeout && + (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size)) + { + /* Blocking mode, but timeout set and no data has arrived, return anyway.*/ + return 0; } - - /* Process the packets. */ - while (p->md.dag_mem_top - p->md.dag_mem_bottom >= dag_record_size) { - - unsigned short packet_len = 0; - int caplen = 0; - struct pcap_pkthdr pcap_header; - - dag_record_t *header = (dag_record_t *)(p->md.dag_mem_base + p->md.dag_mem_bottom); - u_char *dp = ((u_char *)header) + dag_record_size; - unsigned short rlen; - + + } + + /* Process the packets. */ + while (pd->dag_mem_top - pd->dag_mem_bottom >= dag_record_size) { + + unsigned short packet_len = 0; + int caplen = 0; + struct pcap_pkthdr pcap_header; + +#ifdef HAVE_DAG_STREAMS_API + dag_record_t *header = (dag_record_t *)(pd->dag_mem_bottom); +#else + dag_record_t *header = (dag_record_t *)(pd->dag_mem_base + pd->dag_mem_bottom); +#endif /* HAVE_DAG_STREAMS_API */ + + u_char *dp = ((u_char *)header); /* + dag_record_size; */ + unsigned short rlen; + + /* + * Has "pcap_breakloop()" been called? + */ + if (p->break_loop) { /* - * Has "pcap_breakloop()" been called? + * Yes - clear the flag that indicates that + * it has, and return -2 to indicate that + * we were told to break out of the loop. */ - if (p->break_loop) { - /* - * Yes - clear the flag that indicates that - * it has, and return -2 to indicate that - * we were told to break out of the loop. - */ - p->break_loop = 0; - return -2; + p->break_loop = 0; + return -2; + } + + rlen = ntohs(header->rlen); + if (rlen < dag_record_size) + { + strncpy(p->errbuf, "dag_read: record too small", PCAP_ERRBUF_SIZE); + return -1; + } + pd->dag_mem_bottom += rlen; + + /* Count lost packets. */ + switch((header->type & 0x7f)) { + /* in these types the color value overwrites the lctr */ + case TYPE_COLOR_HDLC_POS: + case TYPE_COLOR_ETH: + case TYPE_DSM_COLOR_HDLC_POS: + case TYPE_DSM_COLOR_ETH: + case TYPE_COLOR_MC_HDLC_POS: + case TYPE_COLOR_HASH_ETH: + case TYPE_COLOR_HASH_POS: + break; + + default: + if (header->lctr) { + if (pd->stat.ps_drop > (UINT_MAX - ntohs(header->lctr))) { + pd->stat.ps_drop = UINT_MAX; + } else { + pd->stat.ps_drop += ntohs(header->lctr); + } } - - rlen = ntohs(header->rlen); - if (rlen < dag_record_size) - { - strncpy(p->errbuf, "dag_read: record too small", PCAP_ERRBUF_SIZE); - return -1; + } + + if ((header->type & 0x7f) == TYPE_PAD) { + continue; + } + + num_ext_hdr = dag_erf_ext_header_count(dp, rlen); + + /* ERF encapsulation */ + /* The Extensible Record Format is not dropped for this kind of encapsulation, + * and will be handled as a pseudo header by the decoding application. + * The information carried in the ERF header and in the optional subheader (if present) + * could be merged with the libpcap information, to offer a better decoding. + * The packet length is + * o the length of the packet on the link (header->wlen), + * o plus the length of the ERF header (dag_record_size), as the length of the + * pseudo header will be adjusted during the decoding, + * o plus the length of the optional subheader (if present). + * + * The capture length is header.rlen and the byte stuffing for alignment will be dropped + * if the capture length is greater than the packet length. + */ + if (p->linktype == DLT_ERF) { + packet_len = ntohs(header->wlen) + dag_record_size; + caplen = rlen; + switch ((header->type & 0x7f)) { + case TYPE_MC_AAL5: + case TYPE_MC_ATM: + case TYPE_MC_HDLC: + case TYPE_MC_RAW_CHANNEL: + case TYPE_MC_RAW: + case TYPE_MC_AAL2: + case TYPE_COLOR_MC_HDLC_POS: + packet_len += 4; /* MC header */ + break; + + case TYPE_COLOR_HASH_ETH: + case TYPE_DSM_COLOR_ETH: + case TYPE_COLOR_ETH: + case TYPE_ETH: + packet_len += 2; /* ETH header */ + break; + } /* switch type */ + + /* Include ERF extension headers */ + packet_len += (8 * num_ext_hdr); + + if (caplen > packet_len) { + caplen = packet_len; } - p->md.dag_mem_bottom += rlen; + } else { + /* Other kind of encapsulation according to the header Type */ - switch(header->type) { - case TYPE_AAL5: + /* Skip over generic ERF header */ + dp += dag_record_size; + /* Skip over extension headers */ + dp += 8 * num_ext_hdr; + + switch((header->type & 0x7f)) { case TYPE_ATM: + case TYPE_AAL5: if (header->type == TYPE_AAL5) { - packet_len = ntohs(header->wlen); + packet_len = ntohs(header->wlen); caplen = rlen - dag_record_size; - } else { + } + case TYPE_MC_ATM: + if (header->type == TYPE_MC_ATM) { + caplen = packet_len = ATM_CELL_SIZE; + dp+=4; + } + case TYPE_MC_AAL5: + if (header->type == TYPE_MC_AAL5) { + packet_len = ntohs(header->wlen); + caplen = rlen - dag_record_size - 4; + dp+=4; + } + /* Skip over extension headers */ + caplen -= (8 * num_ext_hdr); + + if (header->type == TYPE_ATM) { caplen = packet_len = ATM_CELL_SIZE; } if (p->linktype == DLT_SUNATM) { struct sunatm_hdr *sunatm = (struct sunatm_hdr *)dp; unsigned long rawatm; - - rawatm = ntohl(*((unsigned long *)dp)); - sunatm->vci = htons((rawatm >> 4) & 0xffff); + + rawatm = ntohl(*((unsigned long *)dp)); + sunatm->vci = htons((rawatm >> 4) & 0xffff); sunatm->vpi = (rawatm >> 20) & 0x00ff; - sunatm->flags = ((header->flags.iface & 1) ? 0x80 : 0x00) | + sunatm->flags = ((header->flags.iface & 1) ? 0x80 : 0x00) | ((sunatm->vpi == 0 && sunatm->vci == htons(5)) ? 6 : - ((sunatm->vpi == 0 && sunatm->vci == htons(16)) ? 5 : - ((dp[ATM_HDR_SIZE] == 0xaa && - dp[ATM_HDR_SIZE+1] == 0xaa && - dp[ATM_HDR_SIZE+2] == 0x03) ? 2 : 1))); + ((sunatm->vpi == 0 && sunatm->vci == htons(16)) ? 5 : + ((dp[ATM_HDR_SIZE] == 0xaa && + dp[ATM_HDR_SIZE+1] == 0xaa && + dp[ATM_HDR_SIZE+2] == 0x03) ? 2 : 1))); } else { packet_len -= ATM_HDR_SIZE; @@ -280,85 +554,145 @@ dag_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) } break; + case TYPE_COLOR_HASH_ETH: + case TYPE_DSM_COLOR_ETH: + case TYPE_COLOR_ETH: case TYPE_ETH: - packet_len = ntohs(header->wlen); - packet_len -= (p->md.dag_fcs_bits >> 3); + packet_len = ntohs(header->wlen); + packet_len -= (pd->dag_fcs_bits >> 3); caplen = rlen - dag_record_size - 2; + /* Skip over extension headers */ + caplen -= (8 * num_ext_hdr); if (caplen > packet_len) { caplen = packet_len; } dp += 2; break; + case TYPE_COLOR_HASH_POS: + case TYPE_DSM_COLOR_HDLC_POS: + case TYPE_COLOR_HDLC_POS: case TYPE_HDLC_POS: - packet_len = ntohs(header->wlen); - packet_len -= (p->md.dag_fcs_bits >> 3); + packet_len = ntohs(header->wlen); + packet_len -= (pd->dag_fcs_bits >> 3); caplen = rlen - dag_record_size; + /* Skip over extension headers */ + caplen -= (8 * num_ext_hdr); if (caplen > packet_len) { caplen = packet_len; } break; - } - - if (caplen > p->snapshot) - caplen = p->snapshot; - /* Count lost packets. */ - if (header->lctr) { - if (p->md.stat.ps_drop > (UINT_MAX - ntohs(header->lctr))) { - p->md.stat.ps_drop = UINT_MAX; - } else { - p->md.stat.ps_drop += ntohs(header->lctr); + case TYPE_COLOR_MC_HDLC_POS: + case TYPE_MC_HDLC: + packet_len = ntohs(header->wlen); + packet_len -= (pd->dag_fcs_bits >> 3); + caplen = rlen - dag_record_size - 4; + /* Skip over extension headers */ + caplen -= (8 * num_ext_hdr); + if (caplen > packet_len) { + caplen = packet_len; } - } - - /* Run the packet filter if there is one. */ - if ((p->fcode.bf_insns == NULL) || bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen)) { - - /* convert between timestamp formats */ - register unsigned long long ts; - - if (IS_BIGENDIAN()) { - ts = SWAP_TS(header->ts); - } else { - ts = header->ts; + /* jump the MC_HDLC_HEADER */ + dp += 4; +#ifdef DLT_MTP2_WITH_PHDR + if (p->linktype == DLT_MTP2_WITH_PHDR) { + /* Add the MTP2 Pseudo Header */ + caplen += MTP2_HDR_LEN; + packet_len += MTP2_HDR_LEN; + + TempPkt[MTP2_SENT_OFFSET] = 0; + TempPkt[MTP2_ANNEX_A_USED_OFFSET] = MTP2_ANNEX_A_USED_UNKNOWN; + *(TempPkt+MTP2_LINK_NUMBER_OFFSET) = ((header->rec.mc_hdlc.mc_header>>16)&0x01); + *(TempPkt+MTP2_LINK_NUMBER_OFFSET+1) = ((header->rec.mc_hdlc.mc_header>>24)&0xff); + memcpy(TempPkt+MTP2_HDR_LEN, dp, caplen); + dp = TempPkt; } +#endif + break; - pcap_header.ts.tv_sec = ts >> 32; - ts = (ts & 0xffffffffULL) * 1000000; - ts += 0x80000000; /* rounding */ - pcap_header.ts.tv_usec = ts >> 32; - if (pcap_header.ts.tv_usec >= 1000000) { - pcap_header.ts.tv_usec -= 1000000; - pcap_header.ts.tv_sec++; + case TYPE_IPV4: + case TYPE_IPV6: + packet_len = ntohs(header->wlen); + caplen = rlen - dag_record_size; + /* Skip over extension headers */ + caplen -= (8 * num_ext_hdr); + if (caplen > packet_len) { + caplen = packet_len; } + break; - /* Fill in our own header data */ - pcap_header.caplen = caplen; - pcap_header.len = packet_len; - - /* Count the packet. */ - p->md.stat.ps_recv++; - - /* Call the user supplied callback function */ - callback(user, &pcap_header, dp); - - /* Only count packets that pass the filter, for consistency with standard Linux behaviour. */ - processed++; - if (processed == cnt) - { - /* Reached the user-specified limit. */ - return cnt; - } + /* These types have no matching 'native' DLT, but can be used with DLT_ERF above */ + case TYPE_MC_RAW: + case TYPE_MC_RAW_CHANNEL: + case TYPE_IP_COUNTER: + case TYPE_TCP_FLOW_COUNTER: + case TYPE_INFINIBAND: + case TYPE_RAW_LINK: + case TYPE_INFINIBAND_LINK: + default: + /* Unhandled ERF type. + * Ignore rather than generating error + */ + continue; + } /* switch type */ + + } /* ERF encapsulation */ + + if (caplen > p->snapshot) + caplen = p->snapshot; + + /* Run the packet filter if there is one. */ + if ((p->fcode.bf_insns == NULL) || bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen)) { + + /* convert between timestamp formats */ + register unsigned long long ts; + + if (IS_BIGENDIAN()) { + ts = SWAPLL(header->ts); + } else { + ts = header->ts; } - } - if (nonblocking || processed) - { - return processed; + switch (p->opt.tstamp_precision) { + case PCAP_TSTAMP_PRECISION_NANO: + ticks_per_second = 1000000000; + break; + case PCAP_TSTAMP_PRECISION_MICRO: + default: + ticks_per_second = 1000000; + break; + + } + pcap_header.ts.tv_sec = ts >> 32; + ts = (ts & 0xffffffffULL) * ticks_per_second; + ts += 0x80000000; /* rounding */ + pcap_header.ts.tv_usec = ts >> 32; + if (pcap_header.ts.tv_usec >= ticks_per_second) { + pcap_header.ts.tv_usec -= ticks_per_second; + pcap_header.ts.tv_sec++; + } + + /* Fill in our own header data */ + pcap_header.caplen = caplen; + pcap_header.len = packet_len; + + /* Count the packet. */ + pd->stat.ps_recv++; + + /* Call the user supplied callback function */ + callback(user, &pcap_header, dp); + + /* Only count packets that pass the filter, for consistency with standard Linux behaviour. */ + processed++; + if (processed == cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) + { + /* Reached the user-specified limit. */ + return cnt; + } } } - + return processed; } @@ -373,270 +707,429 @@ dag_inject(pcap_t *p, const void *buf _U_, size_t size _U_) /* * Get a handle for a live capture from the given DAG device. Passing a NULL * device will result in a failure. The promisc flag is ignored because DAG - * cards are always promiscuous. The to_ms parameter is also ignored as it is - * not supported in hardware. - * + * cards are always promiscuous. The to_ms parameter is used in setting the + * API polling parameters. + * + * snaplen is now also ignored, until we get per-stream slen support. Set + * slen with approprite DAG tool BEFORE pcap_activate(). + * * See also pcap(3). */ -pcap_t * -dag_open_live(const char *device, int snaplen, int promisc, int to_ms, char *ebuf) +static int dag_activate(pcap_t* handle) { + struct pcap_dag *handlep = handle->priv; +#if 0 char conf[30]; /* dag configure string */ - pcap_t *handle; +#endif char *s; int n; daginf_t* daginf; - + char * newDev = NULL; + char * device = handle->opt.device; +#ifdef HAVE_DAG_STREAMS_API + uint32_t mindata; + struct timeval maxwait; + struct timeval poll; +#endif + if (device == NULL) { - snprintf(ebuf, PCAP_ERRBUF_SIZE, "device is NULL: %s", pcap_strerror(errno)); - return NULL; + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "device is NULL: %s", pcap_strerror(errno)); + return -1; } - /* Allocate a handle for this session. */ - handle = malloc(sizeof(*handle)); - if (handle == NULL) { - snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc %s: %s", device, pcap_strerror(errno)); - return NULL; - } - /* Initialize some components of the pcap structure. */ - - memset(handle, 0, sizeof(*handle)); - - if (strstr(device, "/dev") == NULL) { - char * newDev = (char *)malloc(strlen(device) + 6); - newDev[0] = '\0'; - strcat(newDev, "/dev/"); - strcat(newDev,device); - device = newDev; - } else { - device = strdup(device); + +#ifdef HAVE_DAG_STREAMS_API + newDev = (char *)malloc(strlen(device) + 16); + if (newDev == NULL) { + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate string for device name: %s", pcap_strerror(errno)); + goto fail; } - if (device == NULL) { - snprintf(ebuf, PCAP_ERRBUF_SIZE, "str_dup: %s\n", pcap_strerror(errno)); + /* Parse input name to get dag device and stream number if provided */ + if (dag_parse_name(device, newDev, strlen(device) + 16, &handlep->dag_stream) < 0) { + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: %s", pcap_strerror(errno)); goto fail; } + device = newDev; + + if (handlep->dag_stream%2) { + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: tx (even numbered) streams not supported for capture"); + goto fail; + } +#else + if (strncmp(device, "/dev/", 5) != 0) { + newDev = (char *)malloc(strlen(device) + 5); + if (newDev == NULL) { + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate string for device name: %s", pcap_strerror(errno)); + goto fail; + } + strcpy(newDev, "/dev/"); + strcat(newDev, device); + device = newDev; + } +#endif /* HAVE_DAG_STREAMS_API */ /* setup device parameters */ if((handle->fd = dag_open((char *)device)) < 0) { - snprintf(ebuf, PCAP_ERRBUF_SIZE, "dag_open %s: %s", device, pcap_strerror(errno)); + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_open %s: %s", device, pcap_strerror(errno)); goto fail; } +#ifdef HAVE_DAG_STREAMS_API + /* Open requested stream. Can fail if already locked or on error */ + if (dag_attach_stream(handle->fd, handlep->dag_stream, 0, 0) < 0) { + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_attach_stream: %s", pcap_strerror(errno)); + goto failclose; + } + + /* Set up default poll parameters for stream + * Can be overridden by pcap_set_nonblock() + */ + if (dag_get_stream_poll(handle->fd, handlep->dag_stream, + &mindata, &maxwait, &poll) < 0) { + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_get_stream_poll: %s", pcap_strerror(errno)); + goto faildetach; + } + + if (handle->opt.immediate) { + /* Call callback immediately. + * XXX - is this the right way to handle this? + */ + mindata = 0; + } else { + /* Amount of data to collect in Bytes before calling callbacks. + * Important for efficiency, but can introduce latency + * at low packet rates if to_ms not set! + */ + mindata = 65536; + } + + /* Obey opt.timeout (was to_ms) if supplied. This is a good idea! + * Recommend 10-100ms. Calls will time out even if no data arrived. + */ + maxwait.tv_sec = handle->opt.timeout/1000; + maxwait.tv_usec = (handle->opt.timeout%1000) * 1000; + + if (dag_set_stream_poll(handle->fd, handlep->dag_stream, + mindata, &maxwait, &poll) < 0) { + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_set_stream_poll: %s", pcap_strerror(errno)); + goto faildetach; + } + +#else + if((handlep->dag_mem_base = dag_mmap(handle->fd)) == MAP_FAILED) { + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,"dag_mmap %s: %s", device, pcap_strerror(errno)); + goto failclose; + } + +#endif /* HAVE_DAG_STREAMS_API */ + + /* XXX Not calling dag_configure() to set slen; this is unsafe in + * multi-stream environments as the gpp config is global. + * Once the firmware provides 'per-stream slen' this can be supported + * again via the Config API without side-effects */ +#if 0 /* set the card snap length to the specified snaplen parameter */ - if (snaplen == 0 || snaplen > MAX_DAG_SNAPLEN) { - snaplen = MAX_DAG_SNAPLEN; + /* This is a really bad idea, as different cards have different + * valid slen ranges. Should fix in Config API. */ + if (handle->snapshot == 0 || handle->snapshot > MAX_DAG_SNAPLEN) { + handle->snapshot = MAX_DAG_SNAPLEN; } else if (snaplen < MIN_DAG_SNAPLEN) { - snaplen = MIN_DAG_SNAPLEN; + handle->snapshot = MIN_DAG_SNAPLEN; } /* snap len has to be a multiple of 4 */ - snprintf(conf, 30, "varlen slen=%d", (snaplen + 3) & ~3); + pcap_snprintf(conf, 30, "varlen slen=%d", (snaplen + 3) & ~3); if(dag_configure(handle->fd, conf) < 0) { - snprintf(ebuf, PCAP_ERRBUF_SIZE,"dag_configure %s: %s\n", device, pcap_strerror(errno)); - goto fail; + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,"dag_configure %s: %s", device, pcap_strerror(errno)); + goto faildetach; } - - if((handle->md.dag_mem_base = dag_mmap(handle->fd)) == MAP_FAILED) { - snprintf(ebuf, PCAP_ERRBUF_SIZE,"dag_mmap %s: %s\n", device, pcap_strerror(errno)); - goto fail; +#endif + +#ifdef HAVE_DAG_STREAMS_API + if(dag_start_stream(handle->fd, handlep->dag_stream) < 0) { + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_start_stream %s: %s", device, pcap_strerror(errno)); + goto faildetach; } - +#else if(dag_start(handle->fd) < 0) { - snprintf(ebuf, PCAP_ERRBUF_SIZE, "dag_start %s: %s\n", device, pcap_strerror(errno)); - goto fail; + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_start %s: %s", device, pcap_strerror(errno)); + goto failclose; } +#endif /* HAVE_DAG_STREAMS_API */ /* * Important! You have to ensure bottom is properly * initialized to zero on startup, it won't give you * a compiler warning if you make this mistake! */ - handle->md.dag_mem_bottom = 0; - handle->md.dag_mem_top = 0; - handle->md.dag_fcs_bits = 32; + handlep->dag_mem_bottom = 0; + handlep->dag_mem_top = 0; - /* Query the card first for special cases. */ + /* + * Find out how many FCS bits we should strip. + * First, query the card to see if it strips the FCS. + */ daginf = dag_info(handle->fd); - if ((0x4200 == daginf->device_code) || (0x4230 == daginf->device_code)) - { + if ((0x4200 == daginf->device_code) || (0x4230 == daginf->device_code)) { /* DAG 4.2S and 4.23S already strip the FCS. Stripping the final word again truncates the packet. */ - handle->md.dag_fcs_bits = 0; - } + handlep->dag_fcs_bits = 0; - /* Then allow an environment variable to override. */ - if ((s = getenv("ERF_FCS_BITS")) != NULL) { - if ((n = atoi(s)) == 0 || n == 16|| n == 32) { - handle->md.dag_fcs_bits = n; - } else { - snprintf(ebuf, PCAP_ERRBUF_SIZE, - "pcap_open_live %s: bad ERF_FCS_BITS value (%d) in environment\n", device, n); - goto fail; + /* Note that no FCS will be supplied. */ + handle->linktype_ext = LT_FCS_DATALINK_EXT(0); + } else { + /* + * Start out assuming it's 32 bits. + */ + handlep->dag_fcs_bits = 32; + + /* Allow an environment variable to override. */ + if ((s = getenv("ERF_FCS_BITS")) != NULL) { + if ((n = atoi(s)) == 0 || n == 16 || n == 32) { + handlep->dag_fcs_bits = n; + } else { + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, + "pcap_activate %s: bad ERF_FCS_BITS value (%d) in environment", device, n); + goto failstop; + } + } + + /* + * Did the user request that they not be stripped? + */ + if ((s = getenv("ERF_DONT_STRIP_FCS")) != NULL) { + /* Yes. Note the number of bytes that will be + supplied. */ + handle->linktype_ext = LT_FCS_DATALINK_EXT(handlep->dag_fcs_bits/16); + + /* And don't strip them. */ + handlep->dag_fcs_bits = 0; } } - handle->snapshot = snaplen; - /*handle->md.timeout = to_ms; */ + handlep->dag_timeout = handle->opt.timeout; handle->linktype = -1; - if (dag_get_datalink(handle) < 0) { - strcpy(ebuf, handle->errbuf); - goto fail; - } - + if (dag_get_datalink(handle) < 0) + goto failstop; + handle->bufsize = 0; if (new_pcap_dag(handle) < 0) { - snprintf(ebuf, PCAP_ERRBUF_SIZE, "new_pcap_dag %s: %s\n", device, pcap_strerror(errno)); - goto fail; + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "new_pcap_dag %s: %s", device, pcap_strerror(errno)); + goto failstop; } /* - * "select()" and "poll()" don't (yet) work on DAG device descriptors. + * "select()" and "poll()" don't work on DAG device descriptors. */ handle->selectable_fd = -1; -#ifdef linux - handle->md.device = (char *)device; -#else - free((char *)device); - device = NULL; -#endif + if (newDev != NULL) { + free((char *)newDev); + } handle->read_op = dag_read; handle->inject_op = dag_inject; handle->setfilter_op = dag_setfilter; + handle->setdirection_op = NULL; /* Not implemented.*/ handle->set_datalink_op = dag_set_datalink; handle->getnonblock_op = pcap_getnonblock_fd; handle->setnonblock_op = dag_setnonblock; handle->stats_op = dag_stats; - handle->close_op = dag_platform_close; + handle->cleanup_op = dag_platform_cleanup; + handlep->stat.ps_drop = 0; + handlep->stat.ps_recv = 0; + handlep->stat.ps_ifdrop = 0; + return 0; + +#ifdef HAVE_DAG_STREAMS_API +failstop: + if (dag_stop_stream(handle->fd, handlep->dag_stream) < 0) { + fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno)); + } - return handle; +faildetach: + if (dag_detach_stream(handle->fd, handlep->dag_stream) < 0) + fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno)); +#else +failstop: + if (dag_stop(handle->fd) < 0) + fprintf(stderr,"dag_stop: %s\n", strerror(errno)); +#endif /* HAVE_DAG_STREAMS_API */ + +failclose: + if (dag_close(handle->fd) < 0) + fprintf(stderr,"dag_close: %s\n", strerror(errno)); + delete_pcap_dag(handle); fail: - if (device != NULL) { - free((char *)device); + pcap_cleanup_live_common(handle); + if (newDev != NULL) { + free((char *)newDev); } - if (handle != NULL) { - /* - * Get rid of any link-layer type list we allocated. - */ - if (handle->dlt_list != NULL) { - free(handle->dlt_list); - } - free(handle); + + return PCAP_ERROR; +} + +pcap_t *dag_create(const char *device, char *ebuf, int *is_ours) +{ + const char *cp; + char *cpend; + long devnum; + pcap_t *p; +#ifdef HAVE_DAG_STREAMS_API + long stream = 0; +#endif + + /* Does this look like a DAG device? */ + cp = strrchr(device, '/'); + if (cp == NULL) + cp = device; + /* Does it begin with "dag"? */ + if (strncmp(cp, "dag", 3) != 0) { + /* Nope, doesn't begin with "dag" */ + *is_ours = 0; + return NULL; + } + /* Yes - is "dag" followed by a number from 0 to DAG_MAX_BOARDS-1 */ + cp += 3; + devnum = strtol(cp, &cpend, 10); +#ifdef HAVE_DAG_STREAMS_API + if (*cpend == ':') { + /* Followed by a stream number. */ + stream = strtol(++cpend, &cpend, 10); + } +#endif + if (cpend == cp || *cpend != '\0') { + /* Not followed by a number. */ + *is_ours = 0; + return NULL; + } + if (devnum < 0 || devnum >= DAG_MAX_BOARDS) { + /* Followed by a non-valid number. */ + *is_ours = 0; + return NULL; + } +#ifdef HAVE_DAG_STREAMS_API + if (stream <0 || stream >= DAG_STREAM_MAX) { + /* Followed by a non-valid stream number. */ + *is_ours = 0; + return NULL; } +#endif - return NULL; + /* OK, it's probably ours. */ + *is_ours = 1; + + p = pcap_create_common(ebuf, sizeof (struct pcap_dag)); + if (p == NULL) + return NULL; + + p->activate_op = dag_activate; + + /* + * We claim that we support microsecond and nanosecond time + * stamps. + * + * XXX Our native precision is 2^-32s, but libpcap doesn't support + * power of two precisions yet. We can convert to either MICRO or NANO. + */ + p->tstamp_precision_count = 2; + p->tstamp_precision_list = malloc(2 * sizeof(u_int)); + if (p->tstamp_precision_list == NULL) { + pcap_snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", + pcap_strerror(errno)); + pcap_close(p); + return NULL; + } + p->tstamp_precision_list[0] = PCAP_TSTAMP_PRECISION_MICRO; + p->tstamp_precision_list[1] = PCAP_TSTAMP_PRECISION_NANO; + return p; } static int dag_stats(pcap_t *p, struct pcap_stat *ps) { + struct pcap_dag *pd = p->priv; + /* This needs to be filled out correctly. Hopefully a dagapi call will provide all necessary information. */ - /*p->md.stat.ps_recv = 0;*/ - /*p->md.stat.ps_drop = 0;*/ - - *ps = p->md.stat; - + /*pd->stat.ps_recv = 0;*/ + /*pd->stat.ps_drop = 0;*/ + + *ps = pd->stat; + return 0; } /* - * Get from "/proc/dag" all interfaces listed there; if they're - * already in the list of interfaces we have, that won't add another - * instance, but if they're not, that'll add them. - * - * We don't bother getting any addresses for them. + * Previously we just generated a list of all possible names and let + * pcap_add_if() attempt to open each one, but with streams this adds up + * to 81 possibilities which is inefficient. * - * We also don't fail if we couldn't open "/proc/dag"; we just leave - * the list of interfaces as is. + * Since we know more about the devices we can prune the tree here. + * pcap_add_if() will still retest each device but the total number of + * open attempts will still be much less than the naive approach. */ int -dag_platform_finddevs(pcap_if_t **devlistp, char *errbuf) +dag_findalldevs(pcap_if_t **devlistp, char *errbuf) { - FILE *proc_dag_f; - char linebuf[512]; - int linenum; - unsigned char *p; - char name[512]; /* XXX - pick a size */ - char *q; + char name[12]; /* XXX - pick a size */ int ret = 0; - - /* Quick exit if /proc/dag not readable */ - proc_dag_f = fopen("/proc/dag", "r"); - if (proc_dag_f == NULL) - { - int i; - char dev[16] = "dagx"; - - for (i = '0'; ret == 0 && i <= '9'; i++) { - dev[3] = i; - if (pcap_add_if(devlistp, dev, 0, NULL, errbuf) == -1) { + int c; + char dagname[DAGNAME_BUFSIZE]; + int dagstream; + int dagfd; + dag_card_inf_t *inf; + char *description; + + /* Try all the DAGs 0-DAG_MAX_BOARDS */ + for (c = 0; c < DAG_MAX_BOARDS; c++) { + pcap_snprintf(name, 12, "dag%d", c); + if (-1 == dag_parse_name(name, dagname, DAGNAME_BUFSIZE, &dagstream)) + { + return -1; + } + description = NULL; + if ( (dagfd = dag_open(dagname)) >= 0 ) { + if ((inf = dag_pciinfo(dagfd))) + description = dag_device_name(inf->device_code, 1); + if (pcap_add_if(devlistp, name, 0, description, errbuf) == -1) { /* * Failure. */ ret = -1; } +#ifdef HAVE_DAG_STREAMS_API + { + int stream, rxstreams; + rxstreams = dag_rx_get_stream_count(dagfd); + for(stream=0;streamerrbuf, sizeof(p->errbuf), - "malloc: %s", pcap_strerror(errno)); + if (install_bpf_program(p, fp) < 0) return -1; - } - - p->md.use_bpf = 0; return (0); } @@ -680,86 +1168,212 @@ dag_set_datalink(pcap_t *p, int dlt) static int dag_setnonblock(pcap_t *p, int nonblock, char *errbuf) { + struct pcap_dag *pd = p->priv; + /* * Set non-blocking mode on the FD. * XXX - is that necessary? If not, don't bother calling it, * and have a "dag_getnonblock()" function that looks at - * "p->md.dag_offset_flags". + * "pd->dag_offset_flags". */ if (pcap_setnonblock_fd(p, nonblock, errbuf) < 0) return (-1); +#ifdef HAVE_DAG_STREAMS_API + { + uint32_t mindata; + struct timeval maxwait; + struct timeval poll; + + if (dag_get_stream_poll(p->fd, pd->dag_stream, + &mindata, &maxwait, &poll) < 0) { + pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "dag_get_stream_poll: %s", pcap_strerror(errno)); + return -1; + } + /* Amount of data to collect in Bytes before calling callbacks. + * Important for efficiency, but can introduce latency + * at low packet rates if to_ms not set! + */ + if(nonblock) + mindata = 0; + else + mindata = 65536; + + if (dag_set_stream_poll(p->fd, pd->dag_stream, + mindata, &maxwait, &poll) < 0) { + pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "dag_set_stream_poll: %s", pcap_strerror(errno)); + return -1; + } + } +#endif /* HAVE_DAG_STREAMS_API */ if (nonblock) { - p->md.dag_offset_flags |= DAGF_NONBLOCK; + pd->dag_offset_flags |= DAGF_NONBLOCK; } else { - p->md.dag_offset_flags &= ~DAGF_NONBLOCK; + pd->dag_offset_flags &= ~DAGF_NONBLOCK; } return (0); } - + static int dag_get_datalink(pcap_t *p) { - int daglinktype; + struct pcap_dag *pd = p->priv; + int index=0, dlt_index=0; + uint8_t types[255]; + + memset(types, 0, 255); + + if (p->dlt_list == NULL && (p->dlt_list = malloc(255*sizeof(*(p->dlt_list)))) == NULL) { + (void)pcap_snprintf(p->errbuf, sizeof(p->errbuf), "malloc: %s", pcap_strerror(errno)); + return (-1); + } + + p->linktype = 0; + +#ifdef HAVE_DAG_GET_STREAM_ERF_TYPES + /* Get list of possible ERF types for this card */ + if (dag_get_stream_erf_types(p->fd, pd->dag_stream, types, 255) < 0) { + pcap_snprintf(p->errbuf, sizeof(p->errbuf), "dag_get_stream_erf_types: %s", pcap_strerror(errno)); + return (-1); + } + + while (types[index]) { - if (p->dlt_list == NULL && (p->dlt_list = malloc(2*sizeof(*(p->dlt_list)))) == NULL) { - (void)snprintf(p->errbuf, sizeof(p->errbuf), "malloc: %s", pcap_strerror(errno)); +#elif defined HAVE_DAG_GET_ERF_TYPES + /* Get list of possible ERF types for this card */ + if (dag_get_erf_types(p->fd, types, 255) < 0) { + pcap_snprintf(p->errbuf, sizeof(p->errbuf), "dag_get_erf_types: %s", pcap_strerror(errno)); return (-1); } + while (types[index]) { +#else /* Check the type through a dagapi call. */ - daglinktype = dag_linktype(p->fd); + types[index] = dag_linktype(p->fd); - switch(daglinktype) { + { +#endif + switch((types[index] & 0x7f)) { - case TYPE_HDLC_POS: - if (p->dlt_list != NULL) { - p->dlt_count = 2; - p->dlt_list[0] = DLT_CHDLC; - p->dlt_list[1] = DLT_PPP_SERIAL; - } - p->linktype = DLT_CHDLC; - break; + case TYPE_HDLC_POS: + case TYPE_COLOR_HDLC_POS: + case TYPE_DSM_COLOR_HDLC_POS: + case TYPE_COLOR_HASH_POS: - case TYPE_ETH: - /* - * This is (presumably) a real Ethernet capture; give it a - * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so - * that an application can let you choose it, in case you're - * capturing DOCSIS traffic that a Cisco Cable Modem - * Termination System is putting out onto an Ethernet (it - * doesn't put an Ethernet header onto the wire, it puts raw - * DOCSIS frames out on the wire inside the low-level - * Ethernet framing). - */ - if (p->dlt_list != NULL) { - p->dlt_count = 2; - p->dlt_list[0] = DLT_EN10MB; - p->dlt_list[1] = DLT_DOCSIS; - } - p->linktype = DLT_EN10MB; - break; - - case TYPE_AAL5: - case TYPE_ATM: - if (p->dlt_list != NULL) { - p->dlt_count = 2; - p->dlt_list[0] = DLT_ATM_RFC1483; - p->dlt_list[1] = DLT_SUNATM; - } - p->linktype = DLT_ATM_RFC1483; - break; + if (p->dlt_list != NULL) { + p->dlt_list[dlt_index++] = DLT_CHDLC; + p->dlt_list[dlt_index++] = DLT_PPP_SERIAL; + p->dlt_list[dlt_index++] = DLT_FRELAY; + } + if(!p->linktype) + p->linktype = DLT_CHDLC; + break; + + case TYPE_ETH: + case TYPE_COLOR_ETH: + case TYPE_DSM_COLOR_ETH: + case TYPE_COLOR_HASH_ETH: + /* + * This is (presumably) a real Ethernet capture; give it a + * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so + * that an application can let you choose it, in case you're + * capturing DOCSIS traffic that a Cisco Cable Modem + * Termination System is putting out onto an Ethernet (it + * doesn't put an Ethernet header onto the wire, it puts raw + * DOCSIS frames out on the wire inside the low-level + * Ethernet framing). + */ + if (p->dlt_list != NULL) { + p->dlt_list[dlt_index++] = DLT_EN10MB; + p->dlt_list[dlt_index++] = DLT_DOCSIS; + } + if(!p->linktype) + p->linktype = DLT_EN10MB; + break; + case TYPE_ATM: + case TYPE_AAL5: + case TYPE_MC_ATM: + case TYPE_MC_AAL5: + if (p->dlt_list != NULL) { + p->dlt_list[dlt_index++] = DLT_ATM_RFC1483; + p->dlt_list[dlt_index++] = DLT_SUNATM; + } + if(!p->linktype) + p->linktype = DLT_ATM_RFC1483; + break; - case TYPE_LEGACY: - p->linktype = DLT_NULL; - break; + case TYPE_COLOR_MC_HDLC_POS: + case TYPE_MC_HDLC: + if (p->dlt_list != NULL) { + p->dlt_list[dlt_index++] = DLT_CHDLC; + p->dlt_list[dlt_index++] = DLT_PPP_SERIAL; + p->dlt_list[dlt_index++] = DLT_FRELAY; + p->dlt_list[dlt_index++] = DLT_MTP2; + p->dlt_list[dlt_index++] = DLT_MTP2_WITH_PHDR; + p->dlt_list[dlt_index++] = DLT_LAPD; + } + if(!p->linktype) + p->linktype = DLT_CHDLC; + break; - default: - snprintf(p->errbuf, sizeof(p->errbuf), "unknown DAG linktype %d\n", daglinktype); - return (-1); + case TYPE_IPV4: + case TYPE_IPV6: + if(!p->linktype) + p->linktype = DLT_RAW; + break; + case TYPE_LEGACY: + case TYPE_MC_RAW: + case TYPE_MC_RAW_CHANNEL: + case TYPE_IP_COUNTER: + case TYPE_TCP_FLOW_COUNTER: + case TYPE_INFINIBAND: + case TYPE_RAW_LINK: + case TYPE_INFINIBAND_LINK: + default: + /* Libpcap cannot deal with these types yet */ + /* Add no 'native' DLTs, but still covered by DLT_ERF */ + break; + + } /* switch */ + index++; } + p->dlt_list[dlt_index++] = DLT_ERF; + + p->dlt_count = dlt_index; + + if(!p->linktype) + p->linktype = DLT_ERF; + return p->linktype; } + +#ifdef DAG_ONLY +/* + * This libpcap build supports only DAG cards, not regular network + * interfaces. + */ + +/* + * There are no regular interfaces, just DAG interfaces. + */ +int +pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf) +{ + *alldevsp = NULL; + return (0); +} + +/* + * Attempts to open a regular interface fail. + */ +pcap_t * +pcap_create_interface(const char *device, char *errbuf) +{ + pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, + "This version of libpcap only supports DAG cards"); + return NULL; +} +#endif