/* * netsniff-ng - the packet sniffing beast * Copyright (C) 2009, 2010 Daniel Borkmann * Copyright (C) 2012 Christoph Jaeger * Subject to the GPL, version 2. */ #include #include #include /* for ntohs() */ #include /* for inet_ntop() */ #include "proto.h" #include "csum.h" #include "dissector_eth.h" #include "ipv4.h" #include "geoip.h" #include "pkt_buff.h" #include "built_in.h" #define FRAG_OFF_RESERVED_FLAG(x) ((x) & 0x8000) #define FRAG_OFF_NO_FRAGMENT_FLAG(x) ((x) & 0x4000) #define FRAG_OFF_MORE_FRAGMENT_FLAG(x) ((x) & 0x2000) #define FRAG_OFF_FRAGMENT_OFFSET(x) ((x) & 0x1fff) /* IP Option Numbers (http://www.iana.org/assignments/ip-parameters) */ #define IP_OPT_EOOL 0x00 #define IP_OPT_NOP 0x01 #define IP_OPT_COPIED_FLAG(x) ((x) & 0x80) #define IP_OPT_CLASS(x) (((x) & 0x60) >> 5) #define IP_OPT_NUMBER(x) ((x) & 0x1F) static void ipv4(struct pkt_buff *pkt) { uint16_t csum, frag_off, h_tot_len; char src_ip[INET_ADDRSTRLEN]; char dst_ip[INET_ADDRSTRLEN]; struct ipv4hdr *ip = (struct ipv4hdr *) pkt_pull(pkt, sizeof(*ip)); uint8_t *opt, *trailer; unsigned int trailer_len = 0; ssize_t opts_len, opt_len; struct sockaddr_in sas, sad; const char *city, *region, *country; if (!ip) return; frag_off = ntohs(ip->h_frag_off); h_tot_len = ntohs(ip->h_tot_len); csum = calc_csum(ip, ip->h_ihl * 4); inet_ntop(AF_INET, &ip->h_saddr, src_ip, sizeof(src_ip)); inet_ntop(AF_INET, &ip->h_daddr, dst_ip, sizeof(dst_ip)); if ((pkt_len(pkt) + sizeof(*ip)) > h_tot_len) { trailer_len = pkt_len(pkt) + sizeof(*ip) - h_tot_len; trailer = pkt->data + h_tot_len + trailer_len; } if (trailer_len) { tprintf(" [ Eth trailer "); while (trailer_len--) { tprintf("%x", *(trailer - trailer_len)); } tprintf(" ]\n"); } tprintf(" [ IPv4 "); tprintf("Addr (%s => %s), ", src_ip, dst_ip); tprintf("Proto (%u), ", ip->h_protocol); tprintf("TTL (%u), ", ip->h_ttl); tprintf("TOS (%u), ", ip->h_tos); tprintf("Ver (%u), ", ip->h_version); tprintf("IHL (%u), ", ip->h_ihl); tprintf("Tlen (%u), ", ntohs(ip->h_tot_len)); tprintf("ID (%u), ", ntohs(ip->h_id)); tprintf("Res (%u), NoFrag (%u), MoreFrag (%u), FragOff (%u), ", FRAG_OFF_RESERVED_FLAG(frag_off) ? 1 : 0, FRAG_OFF_NO_FRAGMENT_FLAG(frag_off) ? 1 : 0, FRAG_OFF_MORE_FRAGMENT_FLAG(frag_off) ? 1 : 0, FRAG_OFF_FRAGMENT_OFFSET(frag_off)); tprintf("CSum (0x%.4x) is %s", ntohs(ip->h_check), csum ? colorize_start_full(black, red) "bogus (!)" colorize_end() : "ok"); if (csum) tprintf("%s should be 0x%.4x%s", colorize_start_full(black, red), csum_expected(ip->h_check, csum), colorize_end()); tprintf(" ]\n"); memset(&sas, 0, sizeof(sas)); sas.sin_family = PF_INET; sas.sin_addr.s_addr = ip->h_saddr; memset(&sad, 0, sizeof(sad)); sad.sin_family = PF_INET; sad.sin_addr.s_addr = ip->h_daddr; if (geoip_working()) { tprintf("\t[ Geo ("); if ((country = geoip4_country_name(&sas))) { tprintf("%s", country); if ((region = geoip4_region_name(&sas))) tprintf(" / %s", region); if ((city = geoip4_city_name(&sas))) tprintf(" / %s", city); } else { tprintf("local"); } tprintf(" => "); if ((country = geoip4_country_name(&sad))) { tprintf("%s", country); if ((region = geoip4_region_name(&sad))) tprintf(" / %s", region); if ((city = geoip4_city_name(&sad))) tprintf(" / %s", city); } else { tprintf("local"); } tprintf(") ]\n"); } opts_len = max_t(uint8_t, ip->h_ihl, sizeof(*ip) / sizeof(uint32_t)) * sizeof(uint32_t) - sizeof(*ip); for (opt = pkt_pull(pkt, opts_len); opt && opts_len > 0; opt++) { tprintf(" [ Option Copied (%u), Class (%u), Number (%u)", IP_OPT_COPIED_FLAG(*opt) ? 1 : 0, IP_OPT_CLASS(*opt), IP_OPT_NUMBER(*opt)); switch (*opt) { case IP_OPT_EOOL: case IP_OPT_NOP: tprintf(" ]\n"); opts_len--; break; default: /* * Assuming that EOOL and NOP are the only single-byte * options, treat all other options as variable in * length with a minimum of 2. * * TODO: option length might be incorrect in malformed packets, * check and handle that */ opt_len = *(++opt); if (opt_len > opts_len) { tprintf(", Len (%zd, invalid) ]\n", opt_len); goto out; } else tprintf(", Len (%zd) ]\n", opt_len); opts_len -= opt_len; tprintf(" [ Data hex "); for (opt_len -= 2; opt_len > 0; opt_len--) tprintf(" %.2x", *(++opt)); tprintf(" ]\n"); break; } } out: /* cut off everything that is not part of IPv4 payload */ /* XXX there could still be an Ethernet trailer included or others */ pkt_trim(pkt, pkt_len(pkt) - min(pkt_len(pkt), (ntohs(ip->h_tot_len) - ip->h_ihl * sizeof(uint32_t)))); pkt_set_dissector(pkt, ð_lay3, ip->h_protocol); } static void ipv4_less(struct pkt_buff *pkt) { char src_ip[INET_ADDRSTRLEN]; char dst_ip[INET_ADDRSTRLEN]; struct ipv4hdr *ip = (struct ipv4hdr *) pkt_pull(pkt, sizeof(*ip)); if (!ip) return; inet_ntop(AF_INET, &ip->h_saddr, src_ip, sizeof(src_ip)); inet_ntop(AF_INET, &ip->h_daddr, dst_ip, sizeof(dst_ip)); tprintf(" %s/%s Len %u", src_ip, dst_ip, ntohs(ip->h_tot_len)); /* cut off IP options and everything that is not part of IPv4 payload */ pkt_pull(pkt, max_t(uint8_t, ip->h_ihl, sizeof(*ip) / sizeof(uint32_t)) * sizeof(uint32_t) - sizeof(*ip)); /* XXX there could still be an Ethernet trailer included or others */ #if 0 pkt_trim(pkt, pkt_len(pkt) - min(pkt_len(pkt), (ntohs(ip->h_tot_len) - ip->h_ihl * sizeof(uint32_t)))); #endif pkt_set_dissector(pkt, ð_lay3, ip->h_protocol); } struct protocol ipv4_ops = { .key = 0x0800, .print_full = ipv4, .print_less = ipv4_less, }; a> /Documentation/vm/numa parentf3de082c12e5e9ff43c58a7561f6ec3272d03a48 (diff)parent36f671be1db1b17d3d4ab0c8b47f81ccb1efcb75 (diff)
Merge tag 'docs-4.10-rc1-fix' of git://git.lwn.net/linux
Pull documentation fixes from Jonathan Corbet: "Two small fixes: - A merge error on my part broke the DocBook build. I've requisitioned one of tglx's frozen sharks for appropriate disciplinary action and resolved to be more careful about testing the DocBook stuff as long as it's still around. - Fix an error in unaligned-memory-access.txt" * tag 'docs-4.10-rc1-fix' of git://git.lwn.net/linux: Documentation/unaligned-memory-access.txt: fix incorrect comparison operator docs: Fix build failure
Diffstat (limited to 'Documentation/vm/numa')