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ee3b84be JM |
1 | /* |
2 | * Received Data frame processing for IPv4 packets | |
3 | * Copyright (c) 2010, Jouni Malinen <j@w1.fi> | |
4 | * | |
0f3d578e JM |
5 | * This software may be distributed under the terms of the BSD license. |
6 | * See README for more details. | |
ee3b84be JM |
7 | */ |
8 | ||
9 | #include "utils/includes.h" | |
10 | #include <netinet/ip.h> | |
11 | #include <netinet/ip_icmp.h> | |
12 | ||
13 | #include "utils/common.h" | |
14 | #include "wlantest.h" | |
15 | ||
16 | ||
244c9303 JM |
17 | static void ping_update(struct wlantest_sta *sta, int req, u32 src, u32 dst, |
18 | u16 id, u16 seq) | |
19 | { | |
20 | if (req) { | |
21 | sta->icmp_echo_req_src = src; | |
22 | sta->icmp_echo_req_dst = dst; | |
23 | sta->icmp_echo_req_id = id; | |
24 | sta->icmp_echo_req_seq = seq; | |
25 | return; | |
26 | } | |
27 | ||
28 | if (sta->icmp_echo_req_src == dst && | |
29 | sta->icmp_echo_req_dst == src && | |
30 | sta->icmp_echo_req_id == id && | |
31 | sta->icmp_echo_req_seq == seq) { | |
32 | sta->counters[WLANTEST_STA_COUNTER_PING_OK]++; | |
33 | if (sta->counters[WLANTEST_STA_COUNTER_ASSOCREQ_TX] == 0 && | |
34 | sta->counters[WLANTEST_STA_COUNTER_REASSOCREQ_TX] == 0) | |
35 | sta->counters[ | |
36 | WLANTEST_STA_COUNTER_PING_OK_FIRST_ASSOC]++; | |
37 | wpa_printf(MSG_DEBUG, "ICMP echo (ping) match for STA " MACSTR, | |
38 | MAC2STR(sta->addr)); | |
39 | } | |
40 | } | |
41 | ||
42 | ||
ee3b84be JM |
43 | static void rx_data_icmp(struct wlantest *wt, const u8 *bssid, |
44 | const u8 *sta_addr, u32 dst, u32 src, | |
244c9303 | 45 | const u8 *data, size_t len, const u8 *peer_addr) |
ee3b84be JM |
46 | { |
47 | struct in_addr addr; | |
48 | char buf[20]; | |
49 | const struct icmphdr *hdr; | |
50 | u16 id, seq; | |
51 | struct wlantest_bss *bss; | |
52 | struct wlantest_sta *sta; | |
53 | ||
54 | hdr = (const struct icmphdr *) data; | |
55 | if (len < 4) | |
56 | return; | |
57 | ||
58 | /* TODO: check hdr->checksum */ | |
59 | ||
60 | if (hdr->type != ICMP_ECHOREPLY && hdr->type != ICMP_ECHO) | |
61 | return; | |
62 | if (len < 8) | |
63 | return; | |
64 | ||
65 | id = ntohs(hdr->un.echo.id); | |
66 | seq = ntohs(hdr->un.echo.sequence); | |
67 | ||
68 | addr.s_addr = dst; | |
69 | snprintf(buf, sizeof(buf), "%s", inet_ntoa(addr)); | |
70 | addr.s_addr = src; | |
244c9303 | 71 | wpa_printf(MSG_DEBUG, "ICMP echo %s %s -> %s id=%04x seq=%u len=%u%s", |
ee3b84be | 72 | hdr->type == ICMP_ECHO ? "request" : "response", |
244c9303 JM |
73 | inet_ntoa(addr), buf, id, seq, (unsigned) len - 8, |
74 | peer_addr ? " [DL]" : ""); | |
ee3b84be JM |
75 | |
76 | bss = bss_find(wt, bssid); | |
77 | if (bss == NULL) { | |
78 | wpa_printf(MSG_INFO, "No BSS " MACSTR " known for ICMP packet", | |
79 | MAC2STR(bssid)); | |
80 | return; | |
81 | } | |
82 | ||
83 | if (sta_addr == NULL) | |
84 | return; /* FromDS broadcast ping */ | |
85 | ||
86 | sta = sta_find(bss, sta_addr); | |
87 | if (sta == NULL) { | |
88 | wpa_printf(MSG_INFO, "No STA " MACSTR " known for ICMP packet", | |
89 | MAC2STR(sta_addr)); | |
90 | return; | |
91 | } | |
92 | ||
244c9303 JM |
93 | ping_update(sta, hdr->type == ICMP_ECHO, src, dst, id, seq); |
94 | if (peer_addr && (sta = sta_find(bss, peer_addr))) | |
95 | ping_update(sta, hdr->type == ICMP_ECHO, src, dst, id, seq); | |
ee3b84be JM |
96 | } |
97 | ||
98 | ||
99 | void rx_data_ip(struct wlantest *wt, const u8 *bssid, const u8 *sta_addr, | |
244c9303 JM |
100 | const u8 *dst, const u8 *src, const u8 *data, size_t len, |
101 | const u8 *peer_addr) | |
ee3b84be JM |
102 | { |
103 | const struct iphdr *ip; | |
104 | const u8 *payload; | |
105 | size_t plen; | |
106 | u16 frag_off, tot_len; | |
107 | ||
108 | ip = (const struct iphdr *) data; | |
109 | if (len < sizeof(*ip)) | |
110 | return; | |
111 | if (ip->version != 4) { | |
112 | wpa_printf(MSG_DEBUG, "Unexpected IP protocol version %u in " | |
113 | "IPv4 packet (bssid=" MACSTR " str=" MACSTR | |
114 | " dst=" MACSTR ")", ip->version, MAC2STR(bssid), | |
115 | MAC2STR(src), MAC2STR(dst)); | |
116 | return; | |
117 | } | |
118 | if (ip->ihl * 4 < sizeof(*ip)) { | |
119 | wpa_printf(MSG_DEBUG, "Unexpected IP header length %u in " | |
120 | "IPv4 packet (bssid=" MACSTR " str=" MACSTR | |
121 | " dst=" MACSTR ")", ip->ihl, MAC2STR(bssid), | |
122 | MAC2STR(src), MAC2STR(dst)); | |
123 | return; | |
124 | } | |
125 | if (ip->ihl * 4 > len) { | |
126 | wpa_printf(MSG_DEBUG, "Truncated IP header (ihl=%u len=%u) in " | |
127 | "IPv4 packet (bssid=" MACSTR " str=" MACSTR | |
128 | " dst=" MACSTR ")", ip->ihl, (unsigned) len, | |
129 | MAC2STR(bssid), MAC2STR(src), MAC2STR(dst)); | |
130 | return; | |
131 | } | |
132 | ||
133 | /* TODO: check header checksum in ip->check */ | |
134 | ||
135 | frag_off = be_to_host16(ip->frag_off); | |
136 | if (frag_off & 0x1fff) { | |
137 | wpa_printf(MSG_EXCESSIVE, "IP fragment reassembly not yet " | |
138 | "supported"); | |
139 | return; | |
140 | } | |
141 | ||
142 | tot_len = be_to_host16(ip->tot_len); | |
143 | if (tot_len > len) | |
144 | return; | |
145 | if (tot_len < len) | |
146 | len = tot_len; | |
147 | ||
148 | payload = data + 4 * ip->ihl; | |
149 | plen = len - 4 * ip->ihl; | |
150 | ||
151 | switch (ip->protocol) { | |
152 | case IPPROTO_ICMP: | |
153 | rx_data_icmp(wt, bssid, sta_addr, ip->daddr, ip->saddr, | |
244c9303 | 154 | payload, plen, peer_addr); |
ee3b84be JM |
155 | break; |
156 | } | |
157 | } |