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Commit | Line | Data |
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0e6fbc5b PS |
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 | ||
8b7ed2d9 | 49 | int iptunnel_xmit(struct rtable *rt, struct sk_buff *skb, |
0e6fbc5b | 50 | __be32 src, __be32 dst, __u8 proto, |
963a88b3 | 51 | __u8 tos, __u8 ttl, __be16 df, bool xnet) |
0e6fbc5b PS |
52 | { |
53 | int pkt_len = skb->len; | |
54 | struct iphdr *iph; | |
55 | int err; | |
56 | ||
963a88b3 ND |
57 | skb_scrub_packet(skb, xnet); |
58 | ||
7539fadc | 59 | skb_clear_hash(skb); |
0e6fbc5b PS |
60 | skb_dst_set(skb, &rt->dst); |
61 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
62 | ||
63 | /* Push down and install the IP header. */ | |
78a3694d | 64 | skb_push(skb, sizeof(struct iphdr)); |
0e6fbc5b PS |
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; | |
4221f405 | 77 | __ip_select_ident(iph, &rt->dst, (skb_shinfo(skb)->gso_segs ?: 1) - 1); |
0e6fbc5b PS |
78 | |
79 | err = ip_local_out(skb); | |
80 | if (unlikely(net_xmit_eval(err))) | |
81 | pkt_len = 0; | |
82 | return pkt_len; | |
83 | } | |
84 | EXPORT_SYMBOL_GPL(iptunnel_xmit); | |
3d7b46cd PS |
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); | |
7539fadc | 110 | skb_clear_hash_if_not_l4(skb); |
3d7b46cd PS |
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); | |
2d26f0a3 ED |
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); |