Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 2 | /* |
| 3 | * IPV4 GSO/GRO offload support |
| 4 | * Linux INET implementation |
| 5 | * |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 6 | * UDPv4 GSO support |
| 7 | */ |
| 8 | |
| 9 | #include <linux/skbuff.h> |
Eric Dumazet | 4721031 | 2021-11-15 09:05:51 -0800 | [diff] [blame] | 10 | #include <net/gro.h> |
Eric Dumazet | d457a0e | 2023-06-08 19:17:37 +0000 | [diff] [blame] | 11 | #include <net/gso.h> |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 12 | #include <net/udp.h> |
| 13 | #include <net/protocol.h> |
Paolo Abeni | 028e0a4 | 2018-12-14 11:51:59 +0100 | [diff] [blame] | 14 | #include <net/inet_common.h> |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 15 | |
Tom Herbert | 8bce6d7 | 2014-09-29 20:22:29 -0700 | [diff] [blame] | 16 | static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb, |
| 17 | netdev_features_t features, |
| 18 | struct sk_buff *(*gso_inner_segment)(struct sk_buff *skb, |
| 19 | netdev_features_t features), |
Tom Herbert | 4bcb877 | 2014-11-04 09:06:52 -0800 | [diff] [blame] | 20 | __be16 new_protocol, bool is_ipv6) |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 21 | { |
Alexander Duyck | dbef491 | 2016-02-05 15:28:20 -0800 | [diff] [blame] | 22 | int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb); |
David S. Miller | 880388a | 2017-07-03 07:29:12 -0700 | [diff] [blame] | 23 | bool remcsum, need_csum, offload_csum, gso_partial; |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 24 | struct sk_buff *segs = ERR_PTR(-EINVAL); |
Alexander Duyck | dbef491 | 2016-02-05 15:28:20 -0800 | [diff] [blame] | 25 | struct udphdr *uh = udp_hdr(skb); |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 26 | u16 mac_offset = skb->mac_header; |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 27 | __be16 protocol = skb->protocol; |
Alexander Duyck | dbef491 | 2016-02-05 15:28:20 -0800 | [diff] [blame] | 28 | u16 mac_len = skb->mac_len; |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 29 | int udp_offset, outer_hlen; |
Alexander Duyck | 0833482 | 2016-03-11 14:05:47 -0800 | [diff] [blame] | 30 | __wsum partial; |
Ansis Atteka | b40c5f4 | 2017-04-21 15:23:05 -0700 | [diff] [blame] | 31 | bool need_ipsec; |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 32 | |
| 33 | if (unlikely(!pskb_may_pull(skb, tnl_hlen))) |
| 34 | goto out; |
| 35 | |
Alexander Duyck | 0833482 | 2016-03-11 14:05:47 -0800 | [diff] [blame] | 36 | /* Adjust partial header checksum to negate old length. |
| 37 | * We cannot rely on the value contained in uh->len as it is |
| 38 | * possible that the actual value exceeds the boundaries of the |
| 39 | * 16 bit length field due to the header being added outside of an |
| 40 | * IP or IPv6 frame that was already limited to 64K - 1. |
| 41 | */ |
Alexander Duyck | 802ab55 | 2016-04-10 21:45:03 -0400 | [diff] [blame] | 42 | if (skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) |
| 43 | partial = (__force __wsum)uh->len; |
| 44 | else |
| 45 | partial = (__force __wsum)htonl(skb->len); |
| 46 | partial = csum_sub(csum_unfold(uh->check), partial); |
Alexander Duyck | dbef491 | 2016-02-05 15:28:20 -0800 | [diff] [blame] | 47 | |
| 48 | /* setup inner skb. */ |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 49 | skb->encapsulation = 0; |
Alexander Duyck | 5197f34 | 2016-03-22 16:18:07 -0700 | [diff] [blame] | 50 | SKB_GSO_CB(skb)->encap_level = 0; |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 51 | __skb_pull(skb, tnl_hlen); |
| 52 | skb_reset_mac_header(skb); |
| 53 | skb_set_network_header(skb, skb_inner_network_offset(skb)); |
Xin Long | 527beb8 | 2020-10-29 15:04:57 +0800 | [diff] [blame] | 54 | skb_set_transport_header(skb, skb_inner_transport_offset(skb)); |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 55 | skb->mac_len = skb_inner_network_offset(skb); |
Tom Herbert | 8bce6d7 | 2014-09-29 20:22:29 -0700 | [diff] [blame] | 56 | skb->protocol = new_protocol; |
Alexander Duyck | fdaefd6 | 2016-02-05 15:28:14 -0800 | [diff] [blame] | 57 | |
| 58 | need_csum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM); |
Tom Herbert | 4bcb877 | 2014-11-04 09:06:52 -0800 | [diff] [blame] | 59 | skb->encap_hdr_csum = need_csum; |
Alexander Duyck | fdaefd6 | 2016-02-05 15:28:14 -0800 | [diff] [blame] | 60 | |
| 61 | remcsum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TUNNEL_REMCSUM); |
Tom Herbert | e585f23 | 2014-11-04 09:06:54 -0800 | [diff] [blame] | 62 | skb->remcsum_offload = remcsum; |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 63 | |
Ansis Atteka | b40c5f4 | 2017-04-21 15:23:05 -0700 | [diff] [blame] | 64 | need_ipsec = skb_dst(skb) && dst_xfrm(skb_dst(skb)); |
Tom Herbert | 4bcb877 | 2014-11-04 09:06:52 -0800 | [diff] [blame] | 65 | /* Try to offload checksum if possible */ |
| 66 | offload_csum = !!(need_csum && |
Ansis Atteka | b40c5f4 | 2017-04-21 15:23:05 -0700 | [diff] [blame] | 67 | !need_ipsec && |
Alexander Duyck | fdaefd6 | 2016-02-05 15:28:14 -0800 | [diff] [blame] | 68 | (skb->dev->features & |
| 69 | (is_ipv6 ? (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM) : |
| 70 | (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM)))); |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 71 | |
Alexander Duyck | bef3c6c | 2016-02-05 15:27:31 -0800 | [diff] [blame] | 72 | features &= skb->dev->hw_enc_features; |
Xin Long | 4eb5d4a | 2021-01-16 13:59:17 +0800 | [diff] [blame] | 73 | if (need_csum) |
| 74 | features &= ~NETIF_F_SCTP_CRC; |
Alexander Duyck | bef3c6c | 2016-02-05 15:27:31 -0800 | [diff] [blame] | 75 | |
Alexander Duyck | 7fbeffe | 2016-02-05 15:27:43 -0800 | [diff] [blame] | 76 | /* The only checksum offload we care about from here on out is the |
| 77 | * outer one so strip the existing checksum feature flags and |
| 78 | * instead set the flag based on our outer checksum offload value. |
| 79 | */ |
David S. Miller | 880388a | 2017-07-03 07:29:12 -0700 | [diff] [blame] | 80 | if (remcsum) { |
Alexander Duyck | 7fbeffe | 2016-02-05 15:27:43 -0800 | [diff] [blame] | 81 | features &= ~NETIF_F_CSUM_MASK; |
Alexander Duyck | 2246387 | 2016-02-24 16:46:21 -0800 | [diff] [blame] | 82 | if (!need_csum || offload_csum) |
Alexander Duyck | 7fbeffe | 2016-02-05 15:27:43 -0800 | [diff] [blame] | 83 | features |= NETIF_F_HW_CSUM; |
| 84 | } |
| 85 | |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 86 | /* segment inner packet. */ |
Alexander Duyck | bef3c6c | 2016-02-05 15:27:31 -0800 | [diff] [blame] | 87 | segs = gso_inner_segment(skb, features); |
Himangi Saraogi | 2744644 | 2014-07-27 12:38:38 +0530 | [diff] [blame] | 88 | if (IS_ERR_OR_NULL(segs)) { |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 89 | skb_gso_error_unwind(skb, protocol, tnl_hlen, mac_offset, |
| 90 | mac_len); |
| 91 | goto out; |
| 92 | } |
| 93 | |
Steffen Klassert | 07b26c9 | 2016-09-19 12:58:47 +0200 | [diff] [blame] | 94 | gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); |
| 95 | |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 96 | outer_hlen = skb_tnl_header_len(skb); |
| 97 | udp_offset = outer_hlen - tnl_hlen; |
| 98 | skb = segs; |
| 99 | do { |
Alexander Duyck | 802ab55 | 2016-04-10 21:45:03 -0400 | [diff] [blame] | 100 | unsigned int len; |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 101 | |
Alexander Duyck | fdaefd6 | 2016-02-05 15:28:14 -0800 | [diff] [blame] | 102 | if (remcsum) |
Tom Herbert | 4bcb877 | 2014-11-04 09:06:52 -0800 | [diff] [blame] | 103 | skb->ip_summed = CHECKSUM_NONE; |
Alexander Duyck | fdaefd6 | 2016-02-05 15:28:14 -0800 | [diff] [blame] | 104 | |
| 105 | /* Set up inner headers if we are offloading inner checksum */ |
| 106 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Tom Herbert | 4bcb877 | 2014-11-04 09:06:52 -0800 | [diff] [blame] | 107 | skb_reset_inner_headers(skb); |
| 108 | skb->encapsulation = 1; |
| 109 | } |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 110 | |
| 111 | skb->mac_len = mac_len; |
Tom Herbert | 4bcb877 | 2014-11-04 09:06:52 -0800 | [diff] [blame] | 112 | skb->protocol = protocol; |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 113 | |
Alexander Duyck | dbef491 | 2016-02-05 15:28:20 -0800 | [diff] [blame] | 114 | __skb_push(skb, outer_hlen); |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 115 | skb_reset_mac_header(skb); |
| 116 | skb_set_network_header(skb, mac_len); |
| 117 | skb_set_transport_header(skb, udp_offset); |
Alexander Duyck | 802ab55 | 2016-04-10 21:45:03 -0400 | [diff] [blame] | 118 | len = skb->len - udp_offset; |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 119 | uh = udp_hdr(skb); |
Alexander Duyck | 802ab55 | 2016-04-10 21:45:03 -0400 | [diff] [blame] | 120 | |
| 121 | /* If we are only performing partial GSO the inner header |
| 122 | * will be using a length value equal to only one MSS sized |
| 123 | * segment instead of the entire frame. |
| 124 | */ |
Alexey Kodanev | 3d0241d | 2017-10-06 19:02:35 +0300 | [diff] [blame] | 125 | if (gso_partial && skb_is_gso(skb)) { |
Alexander Duyck | 802ab55 | 2016-04-10 21:45:03 -0400 | [diff] [blame] | 126 | uh->len = htons(skb_shinfo(skb)->gso_size + |
| 127 | SKB_GSO_CB(skb)->data_offset + |
| 128 | skb->head - (unsigned char *)uh); |
| 129 | } else { |
| 130 | uh->len = htons(len); |
| 131 | } |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 132 | |
Tom Herbert | 4bcb877 | 2014-11-04 09:06:52 -0800 | [diff] [blame] | 133 | if (!need_csum) |
| 134 | continue; |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 135 | |
Alexander Duyck | 802ab55 | 2016-04-10 21:45:03 -0400 | [diff] [blame] | 136 | uh->check = ~csum_fold(csum_add(partial, |
| 137 | (__force __wsum)htonl(len))); |
Alexander Duyck | fdaefd6 | 2016-02-05 15:28:14 -0800 | [diff] [blame] | 138 | |
| 139 | if (skb->encapsulation || !offload_csum) { |
| 140 | uh->check = gso_make_checksum(skb, ~uh->check); |
| 141 | if (uh->check == 0) |
| 142 | uh->check = CSUM_MANGLED_0; |
| 143 | } else { |
Tom Herbert | 4bcb877 | 2014-11-04 09:06:52 -0800 | [diff] [blame] | 144 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 145 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 146 | skb->csum_offset = offsetof(struct udphdr, check); |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 147 | } |
Tom Herbert | 155e010 | 2014-07-13 19:49:56 -0700 | [diff] [blame] | 148 | } while ((skb = skb->next)); |
| 149 | out: |
| 150 | return segs; |
| 151 | } |
| 152 | |
Tom Herbert | 8bce6d7 | 2014-09-29 20:22:29 -0700 | [diff] [blame] | 153 | struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb, |
| 154 | netdev_features_t features, |
| 155 | bool is_ipv6) |
| 156 | { |
Eric Dumazet | 8d65cd8 | 2021-08-30 20:26:08 -0700 | [diff] [blame] | 157 | const struct net_offload __rcu **offloads; |
Tom Herbert | 8bce6d7 | 2014-09-29 20:22:29 -0700 | [diff] [blame] | 158 | __be16 protocol = skb->protocol; |
Tom Herbert | 8bce6d7 | 2014-09-29 20:22:29 -0700 | [diff] [blame] | 159 | const struct net_offload *ops; |
| 160 | struct sk_buff *segs = ERR_PTR(-EINVAL); |
| 161 | struct sk_buff *(*gso_inner_segment)(struct sk_buff *skb, |
| 162 | netdev_features_t features); |
| 163 | |
| 164 | rcu_read_lock(); |
| 165 | |
| 166 | switch (skb->inner_protocol_type) { |
| 167 | case ENCAP_TYPE_ETHER: |
| 168 | protocol = skb->inner_protocol; |
| 169 | gso_inner_segment = skb_mac_gso_segment; |
| 170 | break; |
| 171 | case ENCAP_TYPE_IPPROTO: |
| 172 | offloads = is_ipv6 ? inet6_offloads : inet_offloads; |
| 173 | ops = rcu_dereference(offloads[skb->inner_ipproto]); |
| 174 | if (!ops || !ops->callbacks.gso_segment) |
| 175 | goto out_unlock; |
| 176 | gso_inner_segment = ops->callbacks.gso_segment; |
| 177 | break; |
| 178 | default: |
| 179 | goto out_unlock; |
| 180 | } |
| 181 | |
| 182 | segs = __skb_udp_tunnel_segment(skb, features, gso_inner_segment, |
Tom Herbert | 4bcb877 | 2014-11-04 09:06:52 -0800 | [diff] [blame] | 183 | protocol, is_ipv6); |
Tom Herbert | 8bce6d7 | 2014-09-29 20:22:29 -0700 | [diff] [blame] | 184 | |
| 185 | out_unlock: |
| 186 | rcu_read_unlock(); |
| 187 | |
| 188 | return segs; |
| 189 | } |
Tom Herbert | a602456 | 2016-04-05 08:22:51 -0700 | [diff] [blame] | 190 | EXPORT_SYMBOL(skb_udp_tunnel_segment); |
Tom Herbert | 8bce6d7 | 2014-09-29 20:22:29 -0700 | [diff] [blame] | 191 | |
Dongseok Yi | c3df39a | 2021-01-30 08:13:27 +0900 | [diff] [blame] | 192 | static void __udpv4_gso_segment_csum(struct sk_buff *seg, |
| 193 | __be32 *oldip, __be32 *newip, |
| 194 | __be16 *oldport, __be16 *newport) |
| 195 | { |
| 196 | struct udphdr *uh; |
| 197 | struct iphdr *iph; |
| 198 | |
| 199 | if (*oldip == *newip && *oldport == *newport) |
| 200 | return; |
| 201 | |
| 202 | uh = udp_hdr(seg); |
| 203 | iph = ip_hdr(seg); |
| 204 | |
| 205 | if (uh->check) { |
| 206 | inet_proto_csum_replace4(&uh->check, seg, *oldip, *newip, |
| 207 | true); |
| 208 | inet_proto_csum_replace2(&uh->check, seg, *oldport, *newport, |
| 209 | false); |
| 210 | if (!uh->check) |
| 211 | uh->check = CSUM_MANGLED_0; |
| 212 | } |
| 213 | *oldport = *newport; |
| 214 | |
| 215 | csum_replace4(&iph->check, *oldip, *newip); |
| 216 | *oldip = *newip; |
| 217 | } |
| 218 | |
| 219 | static struct sk_buff *__udpv4_gso_segment_list_csum(struct sk_buff *segs) |
| 220 | { |
| 221 | struct sk_buff *seg; |
| 222 | struct udphdr *uh, *uh2; |
| 223 | struct iphdr *iph, *iph2; |
| 224 | |
| 225 | seg = segs; |
| 226 | uh = udp_hdr(seg); |
| 227 | iph = ip_hdr(seg); |
| 228 | |
| 229 | if ((udp_hdr(seg)->dest == udp_hdr(seg->next)->dest) && |
| 230 | (udp_hdr(seg)->source == udp_hdr(seg->next)->source) && |
| 231 | (ip_hdr(seg)->daddr == ip_hdr(seg->next)->daddr) && |
| 232 | (ip_hdr(seg)->saddr == ip_hdr(seg->next)->saddr)) |
| 233 | return segs; |
| 234 | |
| 235 | while ((seg = seg->next)) { |
| 236 | uh2 = udp_hdr(seg); |
| 237 | iph2 = ip_hdr(seg); |
| 238 | |
| 239 | __udpv4_gso_segment_csum(seg, |
| 240 | &iph2->saddr, &iph->saddr, |
| 241 | &uh2->source, &uh->source); |
| 242 | __udpv4_gso_segment_csum(seg, |
| 243 | &iph2->daddr, &iph->daddr, |
| 244 | &uh2->dest, &uh->dest); |
| 245 | } |
| 246 | |
| 247 | return segs; |
| 248 | } |
| 249 | |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 250 | static struct sk_buff *__udp_gso_segment_list(struct sk_buff *skb, |
Dongseok Yi | c3df39a | 2021-01-30 08:13:27 +0900 | [diff] [blame] | 251 | netdev_features_t features, |
| 252 | bool is_ipv6) |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 253 | { |
| 254 | unsigned int mss = skb_shinfo(skb)->gso_size; |
| 255 | |
| 256 | skb = skb_segment_list(skb, features, skb_mac_header_len(skb)); |
| 257 | if (IS_ERR(skb)) |
| 258 | return skb; |
| 259 | |
| 260 | udp_hdr(skb)->len = htons(sizeof(struct udphdr) + mss); |
| 261 | |
Dongseok Yi | c3df39a | 2021-01-30 08:13:27 +0900 | [diff] [blame] | 262 | return is_ipv6 ? skb : __udpv4_gso_segment_list_csum(skb); |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 263 | } |
| 264 | |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 265 | struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb, |
Dongseok Yi | c3df39a | 2021-01-30 08:13:27 +0900 | [diff] [blame] | 266 | netdev_features_t features, bool is_ipv6) |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 267 | { |
Willem de Bruijn | ad40585 | 2018-04-26 13:42:18 -0400 | [diff] [blame] | 268 | struct sock *sk = gso_skb->sk; |
| 269 | unsigned int sum_truesize = 0; |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 270 | struct sk_buff *segs, *seg; |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 271 | struct udphdr *uh; |
Alexander Duyck | b21c034 | 2018-05-07 11:08:28 -0700 | [diff] [blame] | 272 | unsigned int mss; |
Alexander Duyck | 04d55b2 | 2018-05-07 11:08:52 -0700 | [diff] [blame] | 273 | bool copy_dtor; |
Alexander Duyck | 9a0d41b | 2018-05-07 11:08:34 -0700 | [diff] [blame] | 274 | __sum16 check; |
| 275 | __be16 newlen; |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 276 | |
Alexander Duyck | b21c034 | 2018-05-07 11:08:28 -0700 | [diff] [blame] | 277 | mss = skb_shinfo(gso_skb)->gso_size; |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 278 | if (gso_skb->len <= sizeof(*uh) + mss) |
| 279 | return ERR_PTR(-EINVAL); |
| 280 | |
Yan Zhai | 9840036 | 2023-07-13 10:28:00 -0700 | [diff] [blame] | 281 | if (skb_gso_ok(gso_skb, features | NETIF_F_GSO_ROBUST)) { |
| 282 | /* Packet is from an untrusted source, reset gso_segs. */ |
| 283 | skb_shinfo(gso_skb)->gso_segs = DIV_ROUND_UP(gso_skb->len - sizeof(*uh), |
| 284 | mss); |
| 285 | return NULL; |
| 286 | } |
| 287 | |
| 288 | if (skb_shinfo(gso_skb)->gso_type & SKB_GSO_FRAGLIST) |
| 289 | return __udp_gso_segment_list(gso_skb, features, is_ipv6); |
| 290 | |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 291 | skb_pull(gso_skb, sizeof(*uh)); |
| 292 | |
Willem de Bruijn | ad40585 | 2018-04-26 13:42:18 -0400 | [diff] [blame] | 293 | /* clear destructor to avoid skb_segment assigning it to tail */ |
Alexander Duyck | 04d55b2 | 2018-05-07 11:08:52 -0700 | [diff] [blame] | 294 | copy_dtor = gso_skb->destructor == sock_wfree; |
| 295 | if (copy_dtor) |
| 296 | gso_skb->destructor = NULL; |
Willem de Bruijn | ad40585 | 2018-04-26 13:42:18 -0400 | [diff] [blame] | 297 | |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 298 | segs = skb_segment(gso_skb, features); |
Enrico Weigelt | 88e235b | 2019-06-05 23:09:05 +0200 | [diff] [blame] | 299 | if (IS_ERR_OR_NULL(segs)) { |
Alexander Duyck | 04d55b2 | 2018-05-07 11:08:52 -0700 | [diff] [blame] | 300 | if (copy_dtor) |
| 301 | gso_skb->destructor = sock_wfree; |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 302 | return segs; |
Willem de Bruijn | ad40585 | 2018-04-26 13:42:18 -0400 | [diff] [blame] | 303 | } |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 304 | |
Alexander Duyck | 6053d0f | 2018-05-07 11:08:46 -0700 | [diff] [blame] | 305 | /* GSO partial and frag_list segmentation only requires splitting |
| 306 | * the frame into an MSS multiple and possibly a remainder, both |
| 307 | * cases return a GSO skb. So update the mss now. |
| 308 | */ |
| 309 | if (skb_is_gso(segs)) |
| 310 | mss *= skb_shinfo(segs)->gso_segs; |
| 311 | |
Alexander Duyck | 0ad6509 | 2018-05-07 11:08:40 -0700 | [diff] [blame] | 312 | seg = segs; |
| 313 | uh = udp_hdr(seg); |
Alexander Duyck | 9a0d41b | 2018-05-07 11:08:34 -0700 | [diff] [blame] | 314 | |
Fred Klassen | 76e2153 | 2019-06-17 12:05:07 -0700 | [diff] [blame] | 315 | /* preserve TX timestamp flags and TS key for first segment */ |
| 316 | skb_shinfo(seg)->tskey = skb_shinfo(gso_skb)->tskey; |
| 317 | skb_shinfo(seg)->tx_flags |= |
| 318 | (skb_shinfo(gso_skb)->tx_flags & SKBTX_ANY_TSTAMP); |
| 319 | |
Alexander Duyck | 9a0d41b | 2018-05-07 11:08:34 -0700 | [diff] [blame] | 320 | /* compute checksum adjustment based on old length versus new */ |
| 321 | newlen = htons(sizeof(*uh) + mss); |
| 322 | check = csum16_add(csum16_sub(uh->check, uh->len), newlen); |
| 323 | |
Alexander Duyck | 0ad6509 | 2018-05-07 11:08:40 -0700 | [diff] [blame] | 324 | for (;;) { |
Alexander Duyck | 04d55b2 | 2018-05-07 11:08:52 -0700 | [diff] [blame] | 325 | if (copy_dtor) { |
| 326 | seg->destructor = sock_wfree; |
| 327 | seg->sk = sk; |
| 328 | sum_truesize += seg->truesize; |
| 329 | } |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 330 | |
Alexander Duyck | 0ad6509 | 2018-05-07 11:08:40 -0700 | [diff] [blame] | 331 | if (!seg->next) |
| 332 | break; |
Willem de Bruijn | ad40585 | 2018-04-26 13:42:18 -0400 | [diff] [blame] | 333 | |
Alexander Duyck | 9a0d41b | 2018-05-07 11:08:34 -0700 | [diff] [blame] | 334 | uh->len = newlen; |
| 335 | uh->check = check; |
| 336 | |
Alexander Duyck | 6053d0f | 2018-05-07 11:08:46 -0700 | [diff] [blame] | 337 | if (seg->ip_summed == CHECKSUM_PARTIAL) |
| 338 | gso_reset_checksum(seg, ~check); |
| 339 | else |
| 340 | uh->check = gso_make_checksum(seg, ~check) ? : |
| 341 | CSUM_MANGLED_0; |
| 342 | |
Alexander Duyck | 0ad6509 | 2018-05-07 11:08:40 -0700 | [diff] [blame] | 343 | seg = seg->next; |
| 344 | uh = udp_hdr(seg); |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 345 | } |
| 346 | |
Alexander Duyck | 0ad6509 | 2018-05-07 11:08:40 -0700 | [diff] [blame] | 347 | /* last packet can be partial gso_size, account for that in checksum */ |
| 348 | newlen = htons(skb_tail_pointer(seg) - skb_transport_header(seg) + |
| 349 | seg->data_len); |
| 350 | check = csum16_add(csum16_sub(uh->check, uh->len), newlen); |
| 351 | |
| 352 | uh->len = newlen; |
| 353 | uh->check = check; |
| 354 | |
Alexander Duyck | 6053d0f | 2018-05-07 11:08:46 -0700 | [diff] [blame] | 355 | if (seg->ip_summed == CHECKSUM_PARTIAL) |
| 356 | gso_reset_checksum(seg, ~check); |
| 357 | else |
| 358 | uh->check = gso_make_checksum(seg, ~check) ? : CSUM_MANGLED_0; |
| 359 | |
Jakub Sitnicki | 10154db | 2024-06-26 19:51:26 +0200 | [diff] [blame] | 360 | /* On the TX path, CHECKSUM_NONE and CHECKSUM_UNNECESSARY have the same |
| 361 | * meaning. However, check for bad offloads in the GSO stack expects the |
| 362 | * latter, if the checksum was calculated in software. To vouch for the |
| 363 | * segment skbs we actually need to set it on the gso_skb. |
| 364 | */ |
| 365 | if (gso_skb->ip_summed == CHECKSUM_NONE) |
| 366 | gso_skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 367 | |
Alexander Duyck | 0ad6509 | 2018-05-07 11:08:40 -0700 | [diff] [blame] | 368 | /* update refcount for the packet */ |
Eric Dumazet | 575b65b | 2018-05-10 19:07:13 -0700 | [diff] [blame] | 369 | if (copy_dtor) { |
| 370 | int delta = sum_truesize - gso_skb->truesize; |
| 371 | |
| 372 | /* In some pathological cases, delta can be negative. |
| 373 | * We need to either use refcount_add() or refcount_sub_and_test() |
| 374 | */ |
| 375 | if (likely(delta >= 0)) |
| 376 | refcount_add(delta, &sk->sk_wmem_alloc); |
| 377 | else |
| 378 | WARN_ON_ONCE(refcount_sub_and_test(-delta, &sk->sk_wmem_alloc)); |
| 379 | } |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 380 | return segs; |
| 381 | } |
| 382 | EXPORT_SYMBOL_GPL(__udp_gso_segment); |
| 383 | |
Willem de Bruijn | 0c19f846 | 2017-11-21 10:22:25 -0500 | [diff] [blame] | 384 | static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb, |
| 385 | netdev_features_t features) |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 386 | { |
| 387 | struct sk_buff *segs = ERR_PTR(-EINVAL); |
Willem de Bruijn | 0c19f846 | 2017-11-21 10:22:25 -0500 | [diff] [blame] | 388 | unsigned int mss; |
| 389 | __wsum csum; |
| 390 | struct udphdr *uh; |
| 391 | struct iphdr *iph; |
Wei-Chun Chao | 7a7ffba | 2013-12-26 13:10:22 -0800 | [diff] [blame] | 392 | |
| 393 | if (skb->encapsulation && |
Tom Herbert | 0f4f4ff | 2014-06-04 17:20:16 -0700 | [diff] [blame] | 394 | (skb_shinfo(skb)->gso_type & |
Willem de Bruijn | 0c19f846 | 2017-11-21 10:22:25 -0500 | [diff] [blame] | 395 | (SKB_GSO_UDP_TUNNEL|SKB_GSO_UDP_TUNNEL_CSUM))) { |
Tom Herbert | 8bce6d7 | 2014-09-29 20:22:29 -0700 | [diff] [blame] | 396 | segs = skb_udp_tunnel_segment(skb, features, false); |
Willem de Bruijn | 0c19f846 | 2017-11-21 10:22:25 -0500 | [diff] [blame] | 397 | goto out; |
| 398 | } |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 399 | |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 400 | if (!(skb_shinfo(skb)->gso_type & (SKB_GSO_UDP | SKB_GSO_UDP_L4))) |
Willem de Bruijn | 121d57a | 2018-01-19 09:29:18 -0500 | [diff] [blame] | 401 | goto out; |
| 402 | |
Willem de Bruijn | 0c19f846 | 2017-11-21 10:22:25 -0500 | [diff] [blame] | 403 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
| 404 | goto out; |
| 405 | |
Yan Zhai | 9840036 | 2023-07-13 10:28:00 -0700 | [diff] [blame] | 406 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) |
Dongseok Yi | c3df39a | 2021-01-30 08:13:27 +0900 | [diff] [blame] | 407 | return __udp_gso_segment(skb, features, false); |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 408 | |
Willem de Bruijn | 0c19f846 | 2017-11-21 10:22:25 -0500 | [diff] [blame] | 409 | mss = skb_shinfo(skb)->gso_size; |
| 410 | if (unlikely(skb->len <= mss)) |
| 411 | goto out; |
| 412 | |
| 413 | /* Do software UFO. Complete and fill in the UDP checksum as |
| 414 | * HW cannot do checksum of UDP packets sent as multiple |
| 415 | * IP fragments. |
| 416 | */ |
| 417 | |
| 418 | uh = udp_hdr(skb); |
| 419 | iph = ip_hdr(skb); |
| 420 | |
| 421 | uh->check = 0; |
| 422 | csum = skb_checksum(skb, 0, skb->len, 0); |
| 423 | uh->check = udp_v4_check(skb->len, iph->saddr, iph->daddr, csum); |
| 424 | if (uh->check == 0) |
| 425 | uh->check = CSUM_MANGLED_0; |
| 426 | |
| 427 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 428 | |
| 429 | /* If there is no outer header we can fake a checksum offload |
| 430 | * due to the fact that we have already done the checksum in |
| 431 | * software prior to segmenting the frame. |
| 432 | */ |
| 433 | if (!skb->encap_hdr_csum) |
| 434 | features |= NETIF_F_HW_CSUM; |
| 435 | |
| 436 | /* Fragment the skb. IP headers of the fragments are updated in |
| 437 | * inet_gso_segment() |
| 438 | */ |
| 439 | segs = skb_segment(skb, features); |
| 440 | out: |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 441 | return segs; |
| 442 | } |
| 443 | |
Eric Dumazet | 0b935d7 | 2021-11-15 09:05:52 -0800 | [diff] [blame] | 444 | |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 445 | #define UDP_GRO_CNT_MAX 64 |
| 446 | static struct sk_buff *udp_gro_receive_segment(struct list_head *head, |
| 447 | struct sk_buff *skb) |
| 448 | { |
Alexander Lobakin | 4b1a862 | 2020-11-11 20:45:25 +0000 | [diff] [blame] | 449 | struct udphdr *uh = udp_gro_udphdr(skb); |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 450 | struct sk_buff *pp = NULL; |
| 451 | struct udphdr *uh2; |
| 452 | struct sk_buff *p; |
Eric Dumazet | 4dd2b82 | 2019-05-01 18:56:28 -0700 | [diff] [blame] | 453 | unsigned int ulen; |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 454 | int ret = 0; |
Richard Gobert | 5babae7 | 2024-04-30 16:35:55 +0200 | [diff] [blame] | 455 | int flush; |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 456 | |
| 457 | /* requires non zero csum, for symmetry with GSO */ |
| 458 | if (!uh->check) { |
| 459 | NAPI_GRO_CB(skb)->flush = 1; |
| 460 | return NULL; |
| 461 | } |
| 462 | |
Eric Dumazet | 4dd2b82 | 2019-05-01 18:56:28 -0700 | [diff] [blame] | 463 | /* Do not deal with padded or malicious packets, sorry ! */ |
| 464 | ulen = ntohs(uh->len); |
| 465 | if (ulen <= sizeof(*uh) || ulen != skb_gro_len(skb)) { |
| 466 | NAPI_GRO_CB(skb)->flush = 1; |
| 467 | return NULL; |
| 468 | } |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 469 | /* pull encapsulating udp header */ |
| 470 | skb_gro_pull(skb, sizeof(struct udphdr)); |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 471 | |
| 472 | list_for_each_entry(p, head, list) { |
| 473 | if (!NAPI_GRO_CB(p)->same_flow) |
| 474 | continue; |
| 475 | |
| 476 | uh2 = udp_hdr(p); |
| 477 | |
| 478 | /* Match ports only, as csum is always non zero */ |
| 479 | if ((*(u32 *)&uh->source != *(u32 *)&uh2->source)) { |
| 480 | NAPI_GRO_CB(p)->same_flow = 0; |
| 481 | continue; |
| 482 | } |
| 483 | |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 484 | if (NAPI_GRO_CB(skb)->is_flist != NAPI_GRO_CB(p)->is_flist) { |
| 485 | NAPI_GRO_CB(skb)->flush = 1; |
| 486 | return p; |
| 487 | } |
| 488 | |
Richard Gobert | 4b0ebbc | 2024-05-09 21:08:18 +0200 | [diff] [blame] | 489 | flush = gro_receive_network_flush(uh, uh2, p); |
Richard Gobert | 5babae7 | 2024-04-30 16:35:55 +0200 | [diff] [blame] | 490 | |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 491 | /* Terminate the flow on len mismatch or if it grow "too much". |
| 492 | * Under small packet flood GRO count could elsewhere grow a lot |
Eric Dumazet | 4dd2b82 | 2019-05-01 18:56:28 -0700 | [diff] [blame] | 493 | * leading to excessive truesize values. |
Paolo Abeni | 21f1b8a | 2019-04-26 12:50:44 +0200 | [diff] [blame] | 494 | * On len mismatch merge the first packet shorter than gso_size, |
| 495 | * otherwise complete the GRO packet. |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 496 | */ |
Richard Gobert | 5babae7 | 2024-04-30 16:35:55 +0200 | [diff] [blame] | 497 | if (ulen > ntohs(uh2->len) || flush) { |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 498 | pp = p; |
| 499 | } else { |
| 500 | if (NAPI_GRO_CB(skb)->is_flist) { |
| 501 | if (!pskb_may_pull(skb, skb_gro_offset(skb))) { |
| 502 | NAPI_GRO_CB(skb)->flush = 1; |
| 503 | return NULL; |
| 504 | } |
| 505 | if ((skb->ip_summed != p->ip_summed) || |
| 506 | (skb->csum_level != p->csum_level)) { |
| 507 | NAPI_GRO_CB(skb)->flush = 1; |
| 508 | return NULL; |
| 509 | } |
| 510 | ret = skb_gro_receive_list(p, skb); |
| 511 | } else { |
| 512 | skb_gro_postpull_rcsum(skb, uh, |
| 513 | sizeof(struct udphdr)); |
| 514 | |
| 515 | ret = skb_gro_receive(p, skb); |
| 516 | } |
| 517 | } |
| 518 | |
| 519 | if (ret || ulen != ntohs(uh2->len) || |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 520 | NAPI_GRO_CB(p)->count >= UDP_GRO_CNT_MAX) |
| 521 | pp = p; |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 522 | |
| 523 | return pp; |
| 524 | } |
| 525 | |
| 526 | /* mismatch, but we never need to flush */ |
| 527 | return NULL; |
| 528 | } |
| 529 | |
David Miller | d4546c2 | 2018-06-24 14:13:49 +0900 | [diff] [blame] | 530 | struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb, |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 531 | struct udphdr *uh, struct sock *sk) |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 532 | { |
David Miller | d4546c2 | 2018-06-24 14:13:49 +0900 | [diff] [blame] | 533 | struct sk_buff *pp = NULL; |
| 534 | struct sk_buff *p; |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 535 | struct udphdr *uh2; |
| 536 | unsigned int off = skb_gro_offset(skb); |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 537 | int flush = 1; |
| 538 | |
Antoine Tenart | 3d010c8 | 2024-03-26 12:33:58 +0100 | [diff] [blame] | 539 | /* We can do L4 aggregation only if the packet can't land in a tunnel |
| 540 | * otherwise we could corrupt the inner stream. Detecting such packets |
| 541 | * cannot be foolproof and the aggregation might still happen in some |
| 542 | * cases. Such packets should be caught in udp_unexpected_gso later. |
Paolo Abeni | 18f25dc | 2021-03-30 12:28:50 +0200 | [diff] [blame] | 543 | */ |
Xin Long | bde1b56 | 2020-03-30 23:31:45 +0800 | [diff] [blame] | 544 | NAPI_GRO_CB(skb)->is_flist = 0; |
Paolo Abeni | 18f25dc | 2021-03-30 12:28:50 +0200 | [diff] [blame] | 545 | if (!sk || !udp_sk(sk)->gro_receive) { |
Antoine Tenart | 64235ea | 2024-03-26 12:34:01 +0100 | [diff] [blame] | 546 | /* If the packet was locally encapsulated in a UDP tunnel that |
| 547 | * wasn't detected above, do not GRO. |
| 548 | */ |
| 549 | if (skb->encapsulation) |
| 550 | goto out; |
| 551 | |
Paolo Abeni | 18f25dc | 2021-03-30 12:28:50 +0200 | [diff] [blame] | 552 | if (skb->dev->features & NETIF_F_GRO_FRAGLIST) |
Eric Dumazet | e1dc0615 | 2023-09-12 09:17:24 +0000 | [diff] [blame] | 553 | NAPI_GRO_CB(skb)->is_flist = sk ? !udp_test_bit(GRO_ENABLED, sk) : 1; |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 554 | |
Paolo Abeni | 18f25dc | 2021-03-30 12:28:50 +0200 | [diff] [blame] | 555 | if ((!sk && (skb->dev->features & NETIF_F_GRO_UDP_FWD)) || |
Eric Dumazet | e1dc0615 | 2023-09-12 09:17:24 +0000 | [diff] [blame] | 556 | (sk && udp_test_bit(GRO_ENABLED, sk)) || NAPI_GRO_CB(skb)->is_flist) |
Paolo Abeni | b43c890 | 2021-07-03 00:38:43 +0200 | [diff] [blame] | 557 | return call_gro_receive(udp_gro_receive_segment, head, skb); |
| 558 | |
| 559 | /* no GRO, be sure flush the current packet */ |
| 560 | goto out; |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 561 | } |
| 562 | |
Paolo Abeni | 18f25dc | 2021-03-30 12:28:50 +0200 | [diff] [blame] | 563 | if (NAPI_GRO_CB(skb)->encap_mark || |
Daniel Borkmann | 89e5c58 | 2021-02-26 22:22:48 +0100 | [diff] [blame] | 564 | (uh->check && skb->ip_summed != CHECKSUM_PARTIAL && |
Tom Herbert | 662880f | 2014-08-27 21:26:56 -0700 | [diff] [blame] | 565 | NAPI_GRO_CB(skb)->csum_cnt == 0 && |
Paolo Abeni | 18f25dc | 2021-03-30 12:28:50 +0200 | [diff] [blame] | 566 | !NAPI_GRO_CB(skb)->csum_valid)) |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 567 | goto out; |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 568 | |
Jesse Gross | fac8e0f | 2016-03-19 09:32:01 -0700 | [diff] [blame] | 569 | /* mark that this skb passed once through the tunnel gro layer */ |
| 570 | NAPI_GRO_CB(skb)->encap_mark = 1; |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 571 | |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 572 | flush = 0; |
| 573 | |
David Miller | d4546c2 | 2018-06-24 14:13:49 +0900 | [diff] [blame] | 574 | list_for_each_entry(p, head, list) { |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 575 | if (!NAPI_GRO_CB(p)->same_flow) |
| 576 | continue; |
| 577 | |
| 578 | uh2 = (struct udphdr *)(p->data + off); |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 579 | |
| 580 | /* Match ports and either checksums are either both zero |
| 581 | * or nonzero. |
| 582 | */ |
| 583 | if ((*(u32 *)&uh->source != *(u32 *)&uh2->source) || |
| 584 | (!uh->check ^ !uh2->check)) { |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 585 | NAPI_GRO_CB(p)->same_flow = 0; |
| 586 | continue; |
| 587 | } |
| 588 | } |
| 589 | |
| 590 | skb_gro_pull(skb, sizeof(struct udphdr)); /* pull encapsulating udp header */ |
Tom Herbert | 6bae1d4 | 2014-06-10 18:54:26 -0700 | [diff] [blame] | 591 | skb_gro_postpull_rcsum(skb, uh, sizeof(struct udphdr)); |
Sabrina Dubroca | fcd91dd | 2016-10-20 15:58:02 +0200 | [diff] [blame] | 592 | pp = call_gro_receive_sk(udp_sk(sk)->gro_receive, sk, head, skb); |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 593 | |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 594 | out: |
Sabrina Dubroca | 603d4cf | 2018-06-30 17:38:55 +0200 | [diff] [blame] | 595 | skb_gro_flush_final(skb, pp, flush); |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 596 | return pp; |
| 597 | } |
Tom Herbert | a602456 | 2016-04-05 08:22:51 -0700 | [diff] [blame] | 598 | EXPORT_SYMBOL(udp_gro_receive); |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 599 | |
Alexander Lobakin | 55e7298 | 2020-11-11 20:45:38 +0000 | [diff] [blame] | 600 | static struct sock *udp4_gro_lookup_skb(struct sk_buff *skb, __be16 sport, |
| 601 | __be16 dport) |
| 602 | { |
| 603 | const struct iphdr *iph = skb_gro_network_header(skb); |
Kuniyuki Iwashima | ba6aac1 | 2022-11-14 13:57:56 -0800 | [diff] [blame] | 604 | struct net *net = dev_net(skb->dev); |
Richard Gobert | 7938cd1 | 2023-07-27 17:33:56 +0200 | [diff] [blame] | 605 | int iif, sdif; |
| 606 | |
| 607 | inet_get_iif_sdif(skb, &iif, &sdif); |
Alexander Lobakin | 55e7298 | 2020-11-11 20:45:38 +0000 | [diff] [blame] | 608 | |
Kuniyuki Iwashima | ba6aac1 | 2022-11-14 13:57:56 -0800 | [diff] [blame] | 609 | return __udp4_lib_lookup(net, iph->saddr, sport, |
Richard Gobert | 7938cd1 | 2023-07-27 17:33:56 +0200 | [diff] [blame] | 610 | iph->daddr, dport, iif, |
| 611 | sdif, net->ipv4.udp_table, NULL); |
Alexander Lobakin | 55e7298 | 2020-11-11 20:45:38 +0000 | [diff] [blame] | 612 | } |
| 613 | |
Paolo Abeni | 028e0a4 | 2018-12-14 11:51:59 +0100 | [diff] [blame] | 614 | INDIRECT_CALLABLE_SCOPE |
| 615 | struct sk_buff *udp4_gro_receive(struct list_head *head, struct sk_buff *skb) |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 616 | { |
| 617 | struct udphdr *uh = udp_gro_udphdr(skb); |
Alexander Lobakin | 55e7298 | 2020-11-11 20:45:38 +0000 | [diff] [blame] | 618 | struct sock *sk = NULL; |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 619 | struct sk_buff *pp; |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 620 | |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 621 | if (unlikely(!uh)) |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 622 | goto flush; |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 623 | |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 624 | /* Don't bother verifying checksum if we're going to flush anyway. */ |
Scott Wood | 2d8f7e2 | 2014-09-10 21:23:18 -0500 | [diff] [blame] | 625 | if (NAPI_GRO_CB(skb)->flush) |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 626 | goto skip; |
| 627 | |
| 628 | if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check, |
| 629 | inet_gro_compute_pseudo)) |
| 630 | goto flush; |
| 631 | else if (uh->check) |
Li RongQing | b39c78b | 2020-01-03 11:51:00 +0800 | [diff] [blame] | 632 | skb_gro_checksum_try_convert(skb, IPPROTO_UDP, |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 633 | inet_gro_compute_pseudo); |
| 634 | skip: |
Tom Herbert | efc98d0 | 2014-10-03 15:48:08 -0700 | [diff] [blame] | 635 | NAPI_GRO_CB(skb)->is_ipv6 = 0; |
Alexander Lobakin | 55e7298 | 2020-11-11 20:45:38 +0000 | [diff] [blame] | 636 | |
| 637 | if (static_branch_unlikely(&udp_encap_needed_key)) |
| 638 | sk = udp4_gro_lookup_skb(skb, uh->source, uh->dest); |
| 639 | |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 640 | pp = udp_gro_receive(head, skb, uh, sk); |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 641 | return pp; |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 642 | |
| 643 | flush: |
| 644 | NAPI_GRO_CB(skb)->flush = 1; |
| 645 | return NULL; |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 646 | } |
| 647 | |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 648 | static int udp_gro_complete_segment(struct sk_buff *skb) |
| 649 | { |
| 650 | struct udphdr *uh = udp_hdr(skb); |
| 651 | |
| 652 | skb->csum_start = (unsigned char *)uh - skb->head; |
| 653 | skb->csum_offset = offsetof(struct udphdr, check); |
| 654 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 655 | |
| 656 | skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count; |
| 657 | skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_L4; |
Jakub Sitnicki | d51c590 | 2021-07-29 15:48:20 +0200 | [diff] [blame] | 658 | |
| 659 | if (skb->encapsulation) |
| 660 | skb->inner_transport_header = skb->transport_header; |
| 661 | |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 662 | return 0; |
| 663 | } |
| 664 | |
Tom Herbert | a602456 | 2016-04-05 08:22:51 -0700 | [diff] [blame] | 665 | int udp_gro_complete(struct sk_buff *skb, int nhoff, |
| 666 | udp_lookup_t lookup) |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 667 | { |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 668 | __be16 newlen = htons(skb->len - nhoff); |
| 669 | struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); |
Tom Herbert | a602456 | 2016-04-05 08:22:51 -0700 | [diff] [blame] | 670 | struct sock *sk; |
Menglong Dong | cef2119 | 2020-11-09 21:57:58 -0500 | [diff] [blame] | 671 | int err; |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 672 | |
| 673 | uh->len = newlen; |
| 674 | |
Paolo Abeni | 4f24ed7 | 2018-12-14 11:52:00 +0100 | [diff] [blame] | 675 | sk = INDIRECT_CALL_INET(lookup, udp6_lib_lookup_skb, |
| 676 | udp4_lib_lookup_skb, skb, uh->source, uh->dest); |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 677 | if (sk && udp_sk(sk)->gro_complete) { |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 678 | skb_shinfo(skb)->gso_type = uh->check ? SKB_GSO_UDP_TUNNEL_CSUM |
| 679 | : SKB_GSO_UDP_TUNNEL; |
| 680 | |
Paolo Abeni | e0e3070 | 2021-03-30 12:28:51 +0200 | [diff] [blame] | 681 | /* clear the encap mark, so that inner frag_list gro_complete |
| 682 | * can take place |
| 683 | */ |
| 684 | NAPI_GRO_CB(skb)->encap_mark = 0; |
| 685 | |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 686 | /* Set encapsulation before calling into inner gro_complete() |
| 687 | * functions to make them set up the inner offsets. |
| 688 | */ |
| 689 | skb->encapsulation = 1; |
Tom Herbert | a602456 | 2016-04-05 08:22:51 -0700 | [diff] [blame] | 690 | err = udp_sk(sk)->gro_complete(sk, skb, |
| 691 | nhoff + sizeof(struct udphdr)); |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 692 | } else { |
| 693 | err = udp_gro_complete_segment(skb); |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 694 | } |
Tom Herbert | 6db93ea | 2015-02-10 16:30:29 -0800 | [diff] [blame] | 695 | |
| 696 | if (skb->remcsum_offload) |
| 697 | skb_shinfo(skb)->gso_type |= SKB_GSO_TUNNEL_REMCSUM; |
| 698 | |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 699 | return err; |
| 700 | } |
Tom Herbert | a602456 | 2016-04-05 08:22:51 -0700 | [diff] [blame] | 701 | EXPORT_SYMBOL(udp_gro_complete); |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 702 | |
Paolo Abeni | 028e0a4 | 2018-12-14 11:51:59 +0100 | [diff] [blame] | 703 | INDIRECT_CALLABLE_SCOPE int udp4_gro_complete(struct sk_buff *skb, int nhoff) |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 704 | { |
Richard Gobert | 5ef31ea | 2024-04-30 16:35:54 +0200 | [diff] [blame] | 705 | const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation]; |
| 706 | const struct iphdr *iph = (struct iphdr *)(skb->data + offset); |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 707 | struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); |
| 708 | |
Paolo Abeni | e0e3070 | 2021-03-30 12:28:51 +0200 | [diff] [blame] | 709 | /* do fraglist only if there is no outer UDP encap (or we already processed it) */ |
| 710 | if (NAPI_GRO_CB(skb)->is_flist && !NAPI_GRO_CB(skb)->encap_mark) { |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 711 | uh->len = htons(skb->len - nhoff); |
| 712 | |
| 713 | skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4); |
| 714 | skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count; |
| 715 | |
Antoine Tenart | f0b8c30 | 2024-03-26 12:34:00 +0100 | [diff] [blame] | 716 | __skb_incr_checksum_unnecessary(skb); |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 717 | |
| 718 | return 0; |
| 719 | } |
| 720 | |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 721 | if (uh->check) |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 722 | uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr, |
| 723 | iph->daddr, 0); |
| 724 | |
Tom Herbert | a602456 | 2016-04-05 08:22:51 -0700 | [diff] [blame] | 725 | return udp_gro_complete(skb, nhoff, udp4_lib_lookup_skb); |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 726 | } |
| 727 | |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 728 | int __init udpv4_offload_init(void) |
| 729 | { |
Eric Dumazet | 6a55ca6 | 2024-03-06 16:00:24 +0000 | [diff] [blame] | 730 | net_hotdata.udpv4_offload = (struct net_offload) { |
| 731 | .callbacks = { |
| 732 | .gso_segment = udp4_ufo_fragment, |
| 733 | .gro_receive = udp4_gro_receive, |
| 734 | .gro_complete = udp4_gro_complete, |
| 735 | }, |
| 736 | }; |
| 737 | return inet_add_offload(&net_hotdata.udpv4_offload, IPPROTO_UDP); |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 738 | } |