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1 | 75020a70 | Dmitry Fleytman | /*
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2 | 75020a70 | Dmitry Fleytman | * QEMU network structures definitions and helper functions
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3 | 75020a70 | Dmitry Fleytman | *
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4 | 75020a70 | Dmitry Fleytman | * Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
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5 | 75020a70 | Dmitry Fleytman | *
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6 | 75020a70 | Dmitry Fleytman | * Developed by Daynix Computing LTD (http://www.daynix.com)
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7 | 75020a70 | Dmitry Fleytman | *
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8 | 75020a70 | Dmitry Fleytman | * Authors:
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9 | 75020a70 | Dmitry Fleytman | * Dmitry Fleytman <dmitry@daynix.com>
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10 | 75020a70 | Dmitry Fleytman | * Tamir Shomer <tamirs@daynix.com>
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11 | 75020a70 | Dmitry Fleytman | * Yan Vugenfirer <yan@daynix.com>
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12 | 75020a70 | Dmitry Fleytman | *
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13 | 75020a70 | Dmitry Fleytman | * This work is licensed under the terms of the GNU GPL, version 2 or later.
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14 | 75020a70 | Dmitry Fleytman | * See the COPYING file in the top-level directory.
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15 | 75020a70 | Dmitry Fleytman | *
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16 | 75020a70 | Dmitry Fleytman | */
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17 | 75020a70 | Dmitry Fleytman | |
18 | 75020a70 | Dmitry Fleytman | #include "net/eth.h" |
19 | 75020a70 | Dmitry Fleytman | #include "net/checksum.h" |
20 | 75020a70 | Dmitry Fleytman | #include "qemu-common.h" |
21 | 75020a70 | Dmitry Fleytman | #include "net/tap.h" |
22 | 75020a70 | Dmitry Fleytman | |
23 | 75020a70 | Dmitry Fleytman | void eth_setup_vlan_headers(struct eth_header *ehdr, uint16_t vlan_tag, |
24 | 75020a70 | Dmitry Fleytman | bool *is_new)
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25 | 75020a70 | Dmitry Fleytman | { |
26 | 75020a70 | Dmitry Fleytman | struct vlan_header *vhdr = PKT_GET_VLAN_HDR(ehdr);
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27 | 75020a70 | Dmitry Fleytman | |
28 | 75020a70 | Dmitry Fleytman | switch (be16_to_cpu(ehdr->h_proto)) {
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29 | 75020a70 | Dmitry Fleytman | case ETH_P_VLAN:
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30 | 75020a70 | Dmitry Fleytman | case ETH_P_DVLAN:
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31 | 75020a70 | Dmitry Fleytman | /* vlan hdr exists */
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32 | 75020a70 | Dmitry Fleytman | *is_new = false;
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33 | 75020a70 | Dmitry Fleytman | break;
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34 | 75020a70 | Dmitry Fleytman | |
35 | 75020a70 | Dmitry Fleytman | default:
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36 | 75020a70 | Dmitry Fleytman | /* No VLAN header, put a new one */
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37 | 75020a70 | Dmitry Fleytman | vhdr->h_proto = ehdr->h_proto; |
38 | 75020a70 | Dmitry Fleytman | ehdr->h_proto = cpu_to_be16(ETH_P_VLAN); |
39 | 75020a70 | Dmitry Fleytman | *is_new = true;
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40 | 75020a70 | Dmitry Fleytman | break;
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41 | 75020a70 | Dmitry Fleytman | } |
42 | 75020a70 | Dmitry Fleytman | vhdr->h_tci = cpu_to_be16(vlan_tag); |
43 | 75020a70 | Dmitry Fleytman | } |
44 | 75020a70 | Dmitry Fleytman | |
45 | 75020a70 | Dmitry Fleytman | uint8_t |
46 | 75020a70 | Dmitry Fleytman | eth_get_gso_type(uint16_t l3_proto, uint8_t *l3_hdr, uint8_t l4proto) |
47 | 75020a70 | Dmitry Fleytman | { |
48 | 75020a70 | Dmitry Fleytman | uint8_t ecn_state = 0;
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49 | 75020a70 | Dmitry Fleytman | |
50 | 75020a70 | Dmitry Fleytman | if (l3_proto == ETH_P_IP) {
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51 | 75020a70 | Dmitry Fleytman | struct ip_header *iphdr = (struct ip_header *) l3_hdr; |
52 | 75020a70 | Dmitry Fleytman | |
53 | 75020a70 | Dmitry Fleytman | if (IP_HEADER_VERSION(iphdr) == IP_HEADER_VERSION_4) {
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54 | 75020a70 | Dmitry Fleytman | if (IPTOS_ECN(iphdr->ip_tos) == IPTOS_ECN_CE) {
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55 | 75020a70 | Dmitry Fleytman | ecn_state = VIRTIO_NET_HDR_GSO_ECN; |
56 | 75020a70 | Dmitry Fleytman | } |
57 | 75020a70 | Dmitry Fleytman | if (l4proto == IP_PROTO_TCP) {
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58 | 75020a70 | Dmitry Fleytman | return VIRTIO_NET_HDR_GSO_TCPV4 | ecn_state;
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59 | 75020a70 | Dmitry Fleytman | } else if (l4proto == IP_PROTO_UDP) { |
60 | 75020a70 | Dmitry Fleytman | return VIRTIO_NET_HDR_GSO_UDP | ecn_state;
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61 | 75020a70 | Dmitry Fleytman | } |
62 | 75020a70 | Dmitry Fleytman | } |
63 | 75020a70 | Dmitry Fleytman | } else if (l3_proto == ETH_P_IPV6) { |
64 | 75020a70 | Dmitry Fleytman | struct ip6_header *ip6hdr = (struct ip6_header *) l3_hdr; |
65 | 75020a70 | Dmitry Fleytman | |
66 | 75020a70 | Dmitry Fleytman | if (IP6_ECN(ip6hdr->ip6_ecn_acc) == IP6_ECN_CE) {
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67 | 75020a70 | Dmitry Fleytman | ecn_state = VIRTIO_NET_HDR_GSO_ECN; |
68 | 75020a70 | Dmitry Fleytman | } |
69 | 75020a70 | Dmitry Fleytman | |
70 | 75020a70 | Dmitry Fleytman | if (l4proto == IP_PROTO_TCP) {
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71 | 75020a70 | Dmitry Fleytman | return VIRTIO_NET_HDR_GSO_TCPV6 | ecn_state;
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72 | 75020a70 | Dmitry Fleytman | } |
73 | 75020a70 | Dmitry Fleytman | } |
74 | 75020a70 | Dmitry Fleytman | |
75 | 75020a70 | Dmitry Fleytman | /* Unsupported offload */
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76 | dfc6f865 | Stefan Weil | g_assert_not_reached(); |
77 | 75020a70 | Dmitry Fleytman | |
78 | 75020a70 | Dmitry Fleytman | return VIRTIO_NET_HDR_GSO_NONE | ecn_state;
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79 | 75020a70 | Dmitry Fleytman | } |
80 | 75020a70 | Dmitry Fleytman | |
81 | 75020a70 | Dmitry Fleytman | void eth_get_protocols(const uint8_t *headers, |
82 | 75020a70 | Dmitry Fleytman | uint32_t hdr_length, |
83 | 75020a70 | Dmitry Fleytman | bool *isip4, bool *isip6, |
84 | 75020a70 | Dmitry Fleytman | bool *isudp, bool *istcp) |
85 | 75020a70 | Dmitry Fleytman | { |
86 | 75020a70 | Dmitry Fleytman | int proto;
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87 | 75020a70 | Dmitry Fleytman | size_t l2hdr_len = eth_get_l2_hdr_length(headers); |
88 | 75020a70 | Dmitry Fleytman | assert(hdr_length >= eth_get_l2_hdr_length(headers)); |
89 | 75020a70 | Dmitry Fleytman | *isip4 = *isip6 = *isudp = *istcp = false;
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90 | 75020a70 | Dmitry Fleytman | |
91 | 75020a70 | Dmitry Fleytman | proto = eth_get_l3_proto(headers, l2hdr_len); |
92 | 75020a70 | Dmitry Fleytman | if (proto == ETH_P_IP) {
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93 | 75020a70 | Dmitry Fleytman | *isip4 = true;
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94 | 75020a70 | Dmitry Fleytman | |
95 | 75020a70 | Dmitry Fleytman | struct ip_header *iphdr;
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96 | 75020a70 | Dmitry Fleytman | |
97 | 75020a70 | Dmitry Fleytman | assert(hdr_length >= |
98 | 75020a70 | Dmitry Fleytman | eth_get_l2_hdr_length(headers) + sizeof(struct ip_header)); |
99 | 75020a70 | Dmitry Fleytman | |
100 | 75020a70 | Dmitry Fleytman | iphdr = PKT_GET_IP_HDR(headers); |
101 | 75020a70 | Dmitry Fleytman | |
102 | 75020a70 | Dmitry Fleytman | if (IP_HEADER_VERSION(iphdr) == IP_HEADER_VERSION_4) {
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103 | 75020a70 | Dmitry Fleytman | if (iphdr->ip_p == IP_PROTO_TCP) {
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104 | 75020a70 | Dmitry Fleytman | *istcp = true;
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105 | 75020a70 | Dmitry Fleytman | } else if (iphdr->ip_p == IP_PROTO_UDP) { |
106 | 75020a70 | Dmitry Fleytman | *isudp = true;
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107 | 75020a70 | Dmitry Fleytman | } |
108 | 75020a70 | Dmitry Fleytman | } |
109 | 75020a70 | Dmitry Fleytman | } else if (proto == ETH_P_IPV6) { |
110 | 75020a70 | Dmitry Fleytman | uint8_t l4proto; |
111 | 75020a70 | Dmitry Fleytman | size_t full_ip6hdr_len; |
112 | 75020a70 | Dmitry Fleytman | |
113 | 75020a70 | Dmitry Fleytman | struct iovec hdr_vec;
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114 | 75020a70 | Dmitry Fleytman | hdr_vec.iov_base = (void *) headers;
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115 | 75020a70 | Dmitry Fleytman | hdr_vec.iov_len = hdr_length; |
116 | 75020a70 | Dmitry Fleytman | |
117 | 75020a70 | Dmitry Fleytman | *isip6 = true;
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118 | 75020a70 | Dmitry Fleytman | if (eth_parse_ipv6_hdr(&hdr_vec, 1, l2hdr_len, |
119 | 75020a70 | Dmitry Fleytman | &l4proto, &full_ip6hdr_len)) { |
120 | 75020a70 | Dmitry Fleytman | if (l4proto == IP_PROTO_TCP) {
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121 | 75020a70 | Dmitry Fleytman | *istcp = true;
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122 | 75020a70 | Dmitry Fleytman | } else if (l4proto == IP_PROTO_UDP) { |
123 | 75020a70 | Dmitry Fleytman | *isudp = true;
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124 | 75020a70 | Dmitry Fleytman | } |
125 | 75020a70 | Dmitry Fleytman | } |
126 | 75020a70 | Dmitry Fleytman | } |
127 | 75020a70 | Dmitry Fleytman | } |
128 | 75020a70 | Dmitry Fleytman | |
129 | 75020a70 | Dmitry Fleytman | void
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130 | 75020a70 | Dmitry Fleytman | eth_setup_ip4_fragmentation(const void *l2hdr, size_t l2hdr_len, |
131 | 75020a70 | Dmitry Fleytman | void *l3hdr, size_t l3hdr_len,
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132 | 75020a70 | Dmitry Fleytman | size_t l3payload_len, |
133 | 75020a70 | Dmitry Fleytman | size_t frag_offset, bool more_frags)
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134 | 75020a70 | Dmitry Fleytman | { |
135 | 75020a70 | Dmitry Fleytman | if (eth_get_l3_proto(l2hdr, l2hdr_len) == ETH_P_IP) {
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136 | 75020a70 | Dmitry Fleytman | uint16_t orig_flags; |
137 | 75020a70 | Dmitry Fleytman | struct ip_header *iphdr = (struct ip_header *) l3hdr; |
138 | 75020a70 | Dmitry Fleytman | uint16_t frag_off_units = frag_offset / IP_FRAG_UNIT_SIZE; |
139 | 75020a70 | Dmitry Fleytman | uint16_t new_ip_off; |
140 | 75020a70 | Dmitry Fleytman | |
141 | 75020a70 | Dmitry Fleytman | assert(frag_offset % IP_FRAG_UNIT_SIZE == 0);
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142 | 75020a70 | Dmitry Fleytman | assert((frag_off_units & ~IP_OFFMASK) == 0);
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143 | 75020a70 | Dmitry Fleytman | |
144 | 75020a70 | Dmitry Fleytman | orig_flags = be16_to_cpu(iphdr->ip_off) & ~(IP_OFFMASK|IP_MF); |
145 | 75020a70 | Dmitry Fleytman | new_ip_off = frag_off_units | orig_flags | (more_frags ? IP_MF : 0);
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146 | 75020a70 | Dmitry Fleytman | iphdr->ip_off = cpu_to_be16(new_ip_off); |
147 | 75020a70 | Dmitry Fleytman | iphdr->ip_len = cpu_to_be16(l3payload_len + l3hdr_len); |
148 | 75020a70 | Dmitry Fleytman | } |
149 | 75020a70 | Dmitry Fleytman | } |
150 | 75020a70 | Dmitry Fleytman | |
151 | 75020a70 | Dmitry Fleytman | void
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152 | 75020a70 | Dmitry Fleytman | eth_fix_ip4_checksum(void *l3hdr, size_t l3hdr_len)
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153 | 75020a70 | Dmitry Fleytman | { |
154 | 75020a70 | Dmitry Fleytman | struct ip_header *iphdr = (struct ip_header *) l3hdr; |
155 | 75020a70 | Dmitry Fleytman | iphdr->ip_sum = 0;
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156 | 75020a70 | Dmitry Fleytman | iphdr->ip_sum = cpu_to_be16(net_raw_checksum(l3hdr, l3hdr_len)); |
157 | 75020a70 | Dmitry Fleytman | } |
158 | 75020a70 | Dmitry Fleytman | |
159 | 75020a70 | Dmitry Fleytman | uint32_t |
160 | 75020a70 | Dmitry Fleytman | eth_calc_pseudo_hdr_csum(struct ip_header *iphdr, uint16_t csl)
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161 | 75020a70 | Dmitry Fleytman | { |
162 | 75020a70 | Dmitry Fleytman | struct ip_pseudo_header ipph;
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163 | 75020a70 | Dmitry Fleytman | ipph.ip_src = iphdr->ip_src; |
164 | 75020a70 | Dmitry Fleytman | ipph.ip_dst = iphdr->ip_dst; |
165 | 75020a70 | Dmitry Fleytman | ipph.ip_payload = cpu_to_be16(csl); |
166 | 75020a70 | Dmitry Fleytman | ipph.ip_proto = iphdr->ip_p; |
167 | 75020a70 | Dmitry Fleytman | ipph.zeros = 0;
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168 | 75020a70 | Dmitry Fleytman | return net_checksum_add(sizeof(ipph), (uint8_t *) &ipph); |
169 | 75020a70 | Dmitry Fleytman | } |
170 | 75020a70 | Dmitry Fleytman | |
171 | 75020a70 | Dmitry Fleytman | static bool |
172 | 75020a70 | Dmitry Fleytman | eth_is_ip6_extension_header_type(uint8_t hdr_type) |
173 | 75020a70 | Dmitry Fleytman | { |
174 | 75020a70 | Dmitry Fleytman | switch (hdr_type) {
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175 | 75020a70 | Dmitry Fleytman | case IP6_HOP_BY_HOP:
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176 | 75020a70 | Dmitry Fleytman | case IP6_ROUTING:
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177 | 75020a70 | Dmitry Fleytman | case IP6_FRAGMENT:
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178 | 75020a70 | Dmitry Fleytman | case IP6_ESP:
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179 | 75020a70 | Dmitry Fleytman | case IP6_AUTHENTICATION:
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180 | 75020a70 | Dmitry Fleytman | case IP6_DESTINATON:
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181 | 75020a70 | Dmitry Fleytman | case IP6_MOBILITY:
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182 | 75020a70 | Dmitry Fleytman | return true; |
183 | 75020a70 | Dmitry Fleytman | default:
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184 | 75020a70 | Dmitry Fleytman | return false; |
185 | 75020a70 | Dmitry Fleytman | } |
186 | 75020a70 | Dmitry Fleytman | } |
187 | 75020a70 | Dmitry Fleytman | |
188 | 75020a70 | Dmitry Fleytman | bool eth_parse_ipv6_hdr(struct iovec *pkt, int pkt_frags, |
189 | 75020a70 | Dmitry Fleytman | size_t ip6hdr_off, uint8_t *l4proto, |
190 | 75020a70 | Dmitry Fleytman | size_t *full_hdr_len) |
191 | 75020a70 | Dmitry Fleytman | { |
192 | 75020a70 | Dmitry Fleytman | struct ip6_header ip6_hdr;
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193 | 75020a70 | Dmitry Fleytman | struct ip6_ext_hdr ext_hdr;
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194 | 75020a70 | Dmitry Fleytman | size_t bytes_read; |
195 | 75020a70 | Dmitry Fleytman | |
196 | 75020a70 | Dmitry Fleytman | bytes_read = iov_to_buf(pkt, pkt_frags, ip6hdr_off, |
197 | 75020a70 | Dmitry Fleytman | &ip6_hdr, sizeof(ip6_hdr));
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198 | 75020a70 | Dmitry Fleytman | if (bytes_read < sizeof(ip6_hdr)) { |
199 | 75020a70 | Dmitry Fleytman | return false; |
200 | 75020a70 | Dmitry Fleytman | } |
201 | 75020a70 | Dmitry Fleytman | |
202 | 75020a70 | Dmitry Fleytman | *full_hdr_len = sizeof(struct ip6_header); |
203 | 75020a70 | Dmitry Fleytman | |
204 | 75020a70 | Dmitry Fleytman | if (!eth_is_ip6_extension_header_type(ip6_hdr.ip6_nxt)) {
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205 | 75020a70 | Dmitry Fleytman | *l4proto = ip6_hdr.ip6_nxt; |
206 | 75020a70 | Dmitry Fleytman | return true; |
207 | 75020a70 | Dmitry Fleytman | } |
208 | 75020a70 | Dmitry Fleytman | |
209 | 75020a70 | Dmitry Fleytman | do {
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210 | 75020a70 | Dmitry Fleytman | bytes_read = iov_to_buf(pkt, pkt_frags, ip6hdr_off + *full_hdr_len, |
211 | 75020a70 | Dmitry Fleytman | &ext_hdr, sizeof(ext_hdr));
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212 | 75020a70 | Dmitry Fleytman | *full_hdr_len += (ext_hdr.ip6r_len + 1) * IP6_EXT_GRANULARITY;
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213 | 75020a70 | Dmitry Fleytman | } while (eth_is_ip6_extension_header_type(ext_hdr.ip6r_nxt));
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214 | 75020a70 | Dmitry Fleytman | |
215 | 75020a70 | Dmitry Fleytman | *l4proto = ext_hdr.ip6r_nxt; |
216 | 75020a70 | Dmitry Fleytman | return true; |
217 | 75020a70 | Dmitry Fleytman | } |