/src/suricata7/src/util-checksum.c
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1 | | /* Copyright (C) 2011-2012 Open Information Security Foundation |
2 | | * |
3 | | * You can copy, redistribute or modify this Program under the terms of |
4 | | * the GNU General Public License version 2 as published by the Free |
5 | | * Software Foundation. |
6 | | * |
7 | | * This program is distributed in the hope that it will be useful, |
8 | | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
9 | | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
10 | | * GNU General Public License for more details. |
11 | | * |
12 | | * You should have received a copy of the GNU General Public License |
13 | | * version 2 along with this program; if not, write to the Free Software |
14 | | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
15 | | * 02110-1301, USA. |
16 | | */ |
17 | | |
18 | | /** |
19 | | * \file |
20 | | * |
21 | | * \author Eric Leblond <eric@regit.org> |
22 | | * |
23 | | * Util functions for checksum. |
24 | | */ |
25 | | |
26 | | #include "suricata-common.h" |
27 | | #include "util-checksum.h" |
28 | | |
29 | | int ReCalculateChecksum(Packet *p) |
30 | 0 | { |
31 | 0 | if (PKT_IS_IPV4(p)) { |
32 | 0 | if (PKT_IS_TCP(p)) { |
33 | | /* TCP */ |
34 | 0 | p->tcph->th_sum = 0; |
35 | 0 | p->tcph->th_sum = TCPChecksum(p->ip4h->s_ip_addrs, |
36 | 0 | (uint16_t *)p->tcph, (p->payload_len + TCP_GET_HLEN(p)), 0); |
37 | 0 | } else if (PKT_IS_UDP(p)) { |
38 | 0 | p->udph->uh_sum = 0; |
39 | 0 | p->udph->uh_sum = UDPV4Checksum(p->ip4h->s_ip_addrs, |
40 | 0 | (uint16_t *)p->udph, (p->payload_len + UDP_HEADER_LEN), 0); |
41 | 0 | } |
42 | | /* IPV4 */ |
43 | 0 | p->ip4h->ip_csum = 0; |
44 | 0 | p->ip4h->ip_csum = IPV4Checksum((uint16_t *)p->ip4h, |
45 | 0 | IPV4_GET_RAW_HLEN(p->ip4h), 0); |
46 | 0 | } else if (PKT_IS_IPV6(p)) { |
47 | | /* just TCP for IPV6 */ |
48 | 0 | if (PKT_IS_TCP(p)) { |
49 | 0 | p->tcph->th_sum = 0; |
50 | 0 | p->tcph->th_sum = TCPV6Checksum(p->ip6h->s_ip6_addrs, |
51 | 0 | (uint16_t *)p->tcph, (p->payload_len + TCP_GET_HLEN(p)), 0); |
52 | 0 | } else if (PKT_IS_UDP(p)) { |
53 | 0 | p->udph->uh_sum = 0; |
54 | 0 | p->udph->uh_sum = UDPV6Checksum(p->ip6h->s_ip6_addrs, |
55 | 0 | (uint16_t *)p->udph, (p->payload_len + UDP_HEADER_LEN), 0); |
56 | 0 | } |
57 | 0 | } |
58 | |
|
59 | 0 | return 0; |
60 | 0 | } |
61 | | |
62 | | /** |
63 | | * \brief Check if the number of invalid checksums indicate checksum |
64 | | * offloading in place. |
65 | | * |
66 | | * \retval 1 yes, offloading in place |
67 | | * \retval 0 no, no offloading used |
68 | | */ |
69 | | int ChecksumAutoModeCheck(uint64_t thread_count, |
70 | | uint64_t iface_count, uint64_t iface_fail) |
71 | 0 | { |
72 | 0 | if (thread_count == CHECKSUM_SAMPLE_COUNT) { |
73 | 0 | if (iface_fail != 0) { |
74 | 0 | if ((iface_count / iface_fail) < CHECKSUM_INVALID_RATIO) { |
75 | 0 | SCLogInfo("More than 1/%dth of packets have an invalid " |
76 | 0 | "checksum, assuming checksum offloading is used " |
77 | 0 | "(%"PRIu64"/%"PRIu64")", |
78 | 0 | CHECKSUM_INVALID_RATIO, iface_fail, iface_count); |
79 | 0 | return 1; |
80 | 0 | } else { |
81 | 0 | SCLogInfo("Less than 1/%dth of packets have an invalid " |
82 | 0 | "checksum, assuming checksum offloading is NOT used " |
83 | 0 | "(%"PRIu64"/%"PRIu64")", CHECKSUM_INVALID_RATIO, |
84 | 0 | iface_fail, iface_count); |
85 | 0 | } |
86 | 0 | } else { |
87 | 0 | SCLogInfo("No packets with invalid checksum, assuming " |
88 | 0 | "checksum offloading is NOT used"); |
89 | 0 | } |
90 | 0 | } |
91 | 0 | return 0; |
92 | 0 | } |