Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
5edbb07d VY |
2 | /* |
3 | * IPV6 GSO/GRO offload support | |
4 | * Linux INET6 implementation | |
5 | * | |
5edbb07d VY |
6 | * UDPv6 GSO support |
7 | */ | |
8 | #include <linux/skbuff.h> | |
57c67ff4 | 9 | #include <linux/netdevice.h> |
028e0a47 | 10 | #include <linux/indirect_call_wrapper.h> |
5edbb07d VY |
11 | #include <net/protocol.h> |
12 | #include <net/ipv6.h> | |
13 | #include <net/udp.h> | |
d4d0d355 | 14 | #include <net/ip6_checksum.h> |
5edbb07d | 15 | #include "ip6_offload.h" |
4721031c | 16 | #include <net/gro.h> |
d457a0e3 | 17 | #include <net/gso.h> |
5edbb07d | 18 | |
0c19f846 WB |
19 | static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, |
20 | netdev_features_t features) | |
5edbb07d VY |
21 | { |
22 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
0c19f846 WB |
23 | unsigned int mss; |
24 | unsigned int unfrag_ip6hlen, unfrag_len; | |
25 | struct frag_hdr *fptr; | |
26 | u8 *packet_start, *prevhdr; | |
27 | u8 nexthdr; | |
28 | u8 frag_hdr_sz = sizeof(struct frag_hdr); | |
29 | __wsum csum; | |
30 | int tnl_hlen; | |
31 | int err; | |
32 | ||
0f4f4ffa TH |
33 | if (skb->encapsulation && skb_shinfo(skb)->gso_type & |
34 | (SKB_GSO_UDP_TUNNEL|SKB_GSO_UDP_TUNNEL_CSUM)) | |
8bce6d7d | 35 | segs = skb_udp_tunnel_segment(skb, features, true); |
0c19f846 WB |
36 | else { |
37 | const struct ipv6hdr *ipv6h; | |
38 | struct udphdr *uh; | |
39 | ||
ee80d1eb | 40 | if (!(skb_shinfo(skb)->gso_type & (SKB_GSO_UDP | SKB_GSO_UDP_L4))) |
121d57af WB |
41 | goto out; |
42 | ||
0c19f846 WB |
43 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
44 | goto out; | |
45 | ||
1fd54773 AM |
46 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4 && |
47 | !skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) | |
c3df39ac | 48 | return __udp_gso_segment(skb, features, true); |
ee80d1eb | 49 | |
3c7d4415 XL |
50 | mss = skb_shinfo(skb)->gso_size; |
51 | if (unlikely(skb->len <= mss)) | |
52 | goto out; | |
53 | ||
0c19f846 WB |
54 | /* Do software UFO. Complete and fill in the UDP checksum as HW cannot |
55 | * do checksum of UDP packets sent as multiple IP fragments. | |
56 | */ | |
57 | ||
58 | uh = udp_hdr(skb); | |
59 | ipv6h = ipv6_hdr(skb); | |
60 | ||
61 | uh->check = 0; | |
62 | csum = skb_checksum(skb, 0, skb->len, 0); | |
63 | uh->check = udp_v6_check(skb->len, &ipv6h->saddr, | |
64 | &ipv6h->daddr, csum); | |
65 | if (uh->check == 0) | |
66 | uh->check = CSUM_MANGLED_0; | |
67 | ||
68 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
69 | ||
70 | /* If there is no outer header we can fake a checksum offload | |
71 | * due to the fact that we have already done the checksum in | |
72 | * software prior to segmenting the frame. | |
73 | */ | |
74 | if (!skb->encap_hdr_csum) | |
75 | features |= NETIF_F_HW_CSUM; | |
76 | ||
77 | /* Check if there is enough headroom to insert fragment header. */ | |
78 | tnl_hlen = skb_tnl_header_len(skb); | |
79 | if (skb->mac_header < (tnl_hlen + frag_hdr_sz)) { | |
80 | if (gso_pskb_expand_head(skb, tnl_hlen + frag_hdr_sz)) | |
81 | goto out; | |
82 | } | |
83 | ||
84 | /* Find the unfragmentable header and shift it left by frag_hdr_sz | |
85 | * bytes to insert fragment header. | |
86 | */ | |
87 | err = ip6_find_1stfragopt(skb, &prevhdr); | |
88 | if (err < 0) | |
89 | return ERR_PTR(err); | |
90 | unfrag_ip6hlen = err; | |
91 | nexthdr = *prevhdr; | |
92 | *prevhdr = NEXTHDR_FRAGMENT; | |
93 | unfrag_len = (skb_network_header(skb) - skb_mac_header(skb)) + | |
94 | unfrag_ip6hlen + tnl_hlen; | |
95 | packet_start = (u8 *) skb->head + SKB_GSO_CB(skb)->mac_offset; | |
96 | memmove(packet_start-frag_hdr_sz, packet_start, unfrag_len); | |
97 | ||
98 | SKB_GSO_CB(skb)->mac_offset -= frag_hdr_sz; | |
99 | skb->mac_header -= frag_hdr_sz; | |
100 | skb->network_header -= frag_hdr_sz; | |
101 | ||
102 | fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen); | |
103 | fptr->nexthdr = nexthdr; | |
104 | fptr->reserved = 0; | |
105 | fptr->identification = ipv6_proxy_select_ident(dev_net(skb->dev), skb); | |
106 | ||
107 | /* Fragment the skb. ipv6 header and the remaining fields of the | |
108 | * fragment header are updated in ipv6_gso_segment() | |
109 | */ | |
110 | segs = skb_segment(skb, features); | |
111 | } | |
5edbb07d | 112 | |
0c19f846 | 113 | out: |
5edbb07d VY |
114 | return segs; |
115 | } | |
57c67ff4 | 116 | |
55e72988 AL |
117 | static struct sock *udp6_gro_lookup_skb(struct sk_buff *skb, __be16 sport, |
118 | __be16 dport) | |
119 | { | |
120 | const struct ipv6hdr *iph = skb_gro_network_header(skb); | |
ba6aac15 | 121 | struct net *net = dev_net(skb->dev); |
55e72988 | 122 | |
ba6aac15 | 123 | return __udp6_lib_lookup(net, &iph->saddr, sport, |
55e72988 | 124 | &iph->daddr, dport, inet6_iif(skb), |
ba6aac15 | 125 | inet6_sdif(skb), net->ipv4.udp_table, NULL); |
55e72988 AL |
126 | } |
127 | ||
028e0a47 PA |
128 | INDIRECT_CALLABLE_SCOPE |
129 | struct sk_buff *udp6_gro_receive(struct list_head *head, struct sk_buff *skb) | |
57c67ff4 TH |
130 | { |
131 | struct udphdr *uh = udp_gro_udphdr(skb); | |
55e72988 | 132 | struct sock *sk = NULL; |
9fd1ff5d | 133 | struct sk_buff *pp; |
57c67ff4 | 134 | |
9fd1ff5d | 135 | if (unlikely(!uh)) |
2abb7cdc TH |
136 | goto flush; |
137 | ||
57c67ff4 | 138 | /* Don't bother verifying checksum if we're going to flush anyway. */ |
2d8f7e2c | 139 | if (NAPI_GRO_CB(skb)->flush) |
2abb7cdc | 140 | goto skip; |
57c67ff4 | 141 | |
2abb7cdc TH |
142 | if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check, |
143 | ip6_gro_compute_pseudo)) | |
144 | goto flush; | |
145 | else if (uh->check) | |
b39c78b2 | 146 | skb_gro_checksum_try_convert(skb, IPPROTO_UDP, |
2abb7cdc TH |
147 | ip6_gro_compute_pseudo); |
148 | ||
149 | skip: | |
efc98d08 | 150 | NAPI_GRO_CB(skb)->is_ipv6 = 1; |
55e72988 AL |
151 | |
152 | if (static_branch_unlikely(&udpv6_encap_needed_key)) | |
153 | sk = udp6_gro_lookup_skb(skb, uh->source, uh->dest); | |
154 | ||
9fd1ff5d | 155 | pp = udp_gro_receive(head, skb, uh, sk); |
9fd1ff5d | 156 | return pp; |
2abb7cdc TH |
157 | |
158 | flush: | |
159 | NAPI_GRO_CB(skb)->flush = 1; | |
160 | return NULL; | |
57c67ff4 TH |
161 | } |
162 | ||
028e0a47 | 163 | INDIRECT_CALLABLE_SCOPE int udp6_gro_complete(struct sk_buff *skb, int nhoff) |
57c67ff4 TH |
164 | { |
165 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
166 | struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); | |
167 | ||
e0e3070a PA |
168 | /* do fraglist only if there is no outer UDP encap (or we already processed it) */ |
169 | if (NAPI_GRO_CB(skb)->is_flist && !NAPI_GRO_CB(skb)->encap_mark) { | |
9fd1ff5d SK |
170 | uh->len = htons(skb->len - nhoff); |
171 | ||
172 | skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4); | |
173 | skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count; | |
174 | ||
175 | if (skb->ip_summed == CHECKSUM_UNNECESSARY) { | |
176 | if (skb->csum_level < SKB_MAX_CSUM_LEVEL) | |
177 | skb->csum_level++; | |
178 | } else { | |
179 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
180 | skb->csum_level = 0; | |
181 | } | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
e20cf8d3 | 186 | if (uh->check) |
57c67ff4 TH |
187 | uh->check = ~udp_v6_check(skb->len - nhoff, &ipv6h->saddr, |
188 | &ipv6h->daddr, 0); | |
189 | ||
a6024562 | 190 | return udp_gro_complete(skb, nhoff, udp6_lib_lookup_skb); |
57c67ff4 TH |
191 | } |
192 | ||
5edbb07d | 193 | static const struct net_offload udpv6_offload = { |
f191a1d1 | 194 | .callbacks = { |
0c19f846 | 195 | .gso_segment = udp6_ufo_fragment, |
57c67ff4 TH |
196 | .gro_receive = udp6_gro_receive, |
197 | .gro_complete = udp6_gro_complete, | |
f191a1d1 | 198 | }, |
5edbb07d VY |
199 | }; |
200 | ||
a6024562 | 201 | int udpv6_offload_init(void) |
5edbb07d VY |
202 | { |
203 | return inet6_add_offload(&udpv6_offload, IPPROTO_UDP); | |
204 | } | |
a6024562 TH |
205 | |
206 | int udpv6_offload_exit(void) | |
207 | { | |
208 | return inet6_del_offload(&udpv6_offload, IPPROTO_UDP); | |
209 | } |