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1 | /* |
2 | * Copyright (c) 2013 Nicira, Inc. |
3 | * |
4 | * This program is free software; you can redistribute it and/or |
5 | * modify it under the terms of version 2 of the GNU General Public |
6 | * License as published by the Free Software Foundation. |
7 | * |
8 | * This program is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * General Public License for more details. |
12 | * |
13 | * You should have received a copy of the GNU General Public License |
14 | * along with this program; if not, write to the Free Software |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301, USA |
17 | */ |
18 | |
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
20 | |
21 | #include <linux/types.h> |
22 | #include <linux/kernel.h> |
23 | #include <linux/skbuff.h> |
24 | #include <linux/netdevice.h> |
25 | #include <linux/in.h> |
26 | #include <linux/if_arp.h> |
27 | #include <linux/mroute.h> |
28 | #include <linux/init.h> |
29 | #include <linux/in6.h> |
30 | #include <linux/inetdevice.h> |
31 | #include <linux/netfilter_ipv4.h> |
32 | #include <linux/etherdevice.h> |
33 | #include <linux/if_ether.h> |
34 | #include <linux/if_vlan.h> |
35 | |
36 | #include <net/ip.h> |
37 | #include <net/icmp.h> |
38 | #include <net/protocol.h> |
39 | #include <net/ip_tunnels.h> |
40 | #include <net/arp.h> |
41 | #include <net/checksum.h> |
42 | #include <net/dsfield.h> |
43 | #include <net/inet_ecn.h> |
44 | #include <net/xfrm.h> |
45 | #include <net/net_namespace.h> |
46 | #include <net/netns/generic.h> |
47 | #include <net/rtnetlink.h> |
48 | |
49 | int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, |
50 | __be32 src, __be32 dst, __u8 proto, |
51 | __u8 tos, __u8 ttl, __be16 df, bool xnet) |
52 | { |
53 | int pkt_len = skb->len; |
54 | struct iphdr *iph; |
55 | int err; |
56 | |
57 | skb_scrub_packet(skb, xnet); |
58 | |
59 | skb_clear_hash(skb); |
60 | skb_dst_set(skb, &rt->dst); |
61 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
62 | |
63 | /* Push down and install the IP header. */ |
64 | skb_push(skb, sizeof(struct iphdr)); |
65 | skb_reset_network_header(skb); |
66 | |
67 | iph = ip_hdr(skb); |
68 | |
69 | iph->version = 4; |
70 | iph->ihl = sizeof(struct iphdr) >> 2; |
71 | iph->frag_off = df; |
72 | iph->protocol = proto; |
73 | iph->tos = tos; |
74 | iph->daddr = dst; |
75 | iph->saddr = src; |
76 | iph->ttl = ttl; |
77 | __ip_select_ident(iph, &rt->dst, (skb_shinfo(skb)->gso_segs ?: 1) - 1); |
78 | |
79 | err = ip_local_out_sk(sk, skb); |
80 | if (unlikely(net_xmit_eval(err))) |
81 | pkt_len = 0; |
82 | return pkt_len; |
83 | } |
84 | EXPORT_SYMBOL_GPL(iptunnel_xmit); |
85 | |
86 | int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto) |
87 | { |
88 | if (unlikely(!pskb_may_pull(skb, hdr_len))) |
89 | return -ENOMEM; |
90 | |
91 | skb_pull_rcsum(skb, hdr_len); |
92 | |
93 | if (inner_proto == htons(ETH_P_TEB)) { |
94 | struct ethhdr *eh = (struct ethhdr *)skb->data; |
95 | |
96 | if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) |
97 | return -ENOMEM; |
98 | |
99 | if (likely(ntohs(eh->h_proto) >= ETH_P_802_3_MIN)) |
100 | skb->protocol = eh->h_proto; |
101 | else |
102 | skb->protocol = htons(ETH_P_802_2); |
103 | |
104 | } else { |
105 | skb->protocol = inner_proto; |
106 | } |
107 | |
108 | nf_reset(skb); |
109 | secpath_reset(skb); |
110 | skb_clear_hash_if_not_l4(skb); |
111 | skb_dst_drop(skb); |
112 | skb->vlan_tci = 0; |
113 | skb_set_queue_mapping(skb, 0); |
114 | skb->pkt_type = PACKET_HOST; |
115 | return 0; |
116 | } |
117 | EXPORT_SYMBOL_GPL(iptunnel_pull_header); |
118 | |
119 | struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, |
120 | bool csum_help, |
121 | int gso_type_mask) |
122 | { |
123 | int err; |
124 | |
125 | if (likely(!skb->encapsulation)) { |
126 | skb_reset_inner_headers(skb); |
127 | skb->encapsulation = 1; |
128 | } |
129 | |
130 | if (skb_is_gso(skb)) { |
131 | err = skb_unclone(skb, GFP_ATOMIC); |
132 | if (unlikely(err)) |
133 | goto error; |
134 | skb_shinfo(skb)->gso_type |= gso_type_mask; |
135 | return skb; |
136 | } |
137 | |
138 | if (skb->ip_summed == CHECKSUM_PARTIAL && csum_help) { |
139 | err = skb_checksum_help(skb); |
140 | if (unlikely(err)) |
141 | goto error; |
142 | } else if (skb->ip_summed != CHECKSUM_PARTIAL) |
143 | skb->ip_summed = CHECKSUM_NONE; |
144 | |
145 | return skb; |
146 | error: |
147 | kfree_skb(skb); |
148 | return ERR_PTR(err); |
149 | } |
150 | EXPORT_SYMBOL_GPL(iptunnel_handle_offloads); |
151 | |
152 | /* Often modified stats are per cpu, other are shared (netdev->stats) */ |
153 | struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, |
154 | struct rtnl_link_stats64 *tot) |
155 | { |
156 | int i; |
157 | |
158 | for_each_possible_cpu(i) { |
159 | const struct pcpu_sw_netstats *tstats = |
160 | per_cpu_ptr(dev->tstats, i); |
161 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
162 | unsigned int start; |
163 | |
164 | do { |
165 | start = u64_stats_fetch_begin_irq(&tstats->syncp); |
166 | rx_packets = tstats->rx_packets; |
167 | tx_packets = tstats->tx_packets; |
168 | rx_bytes = tstats->rx_bytes; |
169 | tx_bytes = tstats->tx_bytes; |
170 | } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); |
171 | |
172 | tot->rx_packets += rx_packets; |
173 | tot->tx_packets += tx_packets; |
174 | tot->rx_bytes += rx_bytes; |
175 | tot->tx_bytes += tx_bytes; |
176 | } |
177 | |
178 | tot->multicast = dev->stats.multicast; |
179 | |
180 | tot->rx_crc_errors = dev->stats.rx_crc_errors; |
181 | tot->rx_fifo_errors = dev->stats.rx_fifo_errors; |
182 | tot->rx_length_errors = dev->stats.rx_length_errors; |
183 | tot->rx_frame_errors = dev->stats.rx_frame_errors; |
184 | tot->rx_errors = dev->stats.rx_errors; |
185 | |
186 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
187 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; |
188 | tot->tx_dropped = dev->stats.tx_dropped; |
189 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; |
190 | tot->tx_errors = dev->stats.tx_errors; |
191 | |
192 | tot->collisions = dev->stats.collisions; |
193 | |
194 | return tot; |
195 | } |
196 | EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64); |
197 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9