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 | |
Willem de Bruijn | 89add40 | 2024-07-29 16:10:12 -0400 | [diff] [blame] | 281 | if (unlikely(skb_checksum_start(gso_skb) != |
Felix Fietkau | b128ed5 | 2024-08-19 17:06:21 +0200 | [diff] [blame] | 282 | skb_transport_header(gso_skb) && |
| 283 | !(skb_shinfo(gso_skb)->gso_type & SKB_GSO_FRAGLIST))) |
Willem de Bruijn | 89add40 | 2024-07-29 16:10:12 -0400 | [diff] [blame] | 284 | return ERR_PTR(-EINVAL); |
| 285 | |
Jakub Sitnicki | 30b03f2 | 2024-08-08 11:56:22 +0200 | [diff] [blame] | 286 | /* We don't know if egress device can segment and checksum the packet |
| 287 | * when IPv6 extension headers are present. Fall back to software GSO. |
| 288 | */ |
| 289 | if (gso_skb->ip_summed != CHECKSUM_PARTIAL) |
| 290 | features &= ~(NETIF_F_GSO_UDP_L4 | NETIF_F_CSUM_MASK); |
| 291 | |
Yan Zhai | 9840036 | 2023-07-13 10:28:00 -0700 | [diff] [blame] | 292 | if (skb_gso_ok(gso_skb, features | NETIF_F_GSO_ROBUST)) { |
| 293 | /* Packet is from an untrusted source, reset gso_segs. */ |
| 294 | skb_shinfo(gso_skb)->gso_segs = DIV_ROUND_UP(gso_skb->len - sizeof(*uh), |
| 295 | mss); |
| 296 | return NULL; |
| 297 | } |
| 298 | |
| 299 | if (skb_shinfo(gso_skb)->gso_type & SKB_GSO_FRAGLIST) |
| 300 | return __udp_gso_segment_list(gso_skb, features, is_ipv6); |
| 301 | |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 302 | skb_pull(gso_skb, sizeof(*uh)); |
| 303 | |
Willem de Bruijn | ad40585 | 2018-04-26 13:42:18 -0400 | [diff] [blame] | 304 | /* clear destructor to avoid skb_segment assigning it to tail */ |
Alexander Duyck | 04d55b2 | 2018-05-07 11:08:52 -0700 | [diff] [blame] | 305 | copy_dtor = gso_skb->destructor == sock_wfree; |
| 306 | if (copy_dtor) |
| 307 | gso_skb->destructor = NULL; |
Willem de Bruijn | ad40585 | 2018-04-26 13:42:18 -0400 | [diff] [blame] | 308 | |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 309 | segs = skb_segment(gso_skb, features); |
Enrico Weigelt | 88e235b | 2019-06-05 23:09:05 +0200 | [diff] [blame] | 310 | if (IS_ERR_OR_NULL(segs)) { |
Alexander Duyck | 04d55b2 | 2018-05-07 11:08:52 -0700 | [diff] [blame] | 311 | if (copy_dtor) |
| 312 | gso_skb->destructor = sock_wfree; |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 313 | return segs; |
Willem de Bruijn | ad40585 | 2018-04-26 13:42:18 -0400 | [diff] [blame] | 314 | } |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 315 | |
Alexander Duyck | 6053d0f | 2018-05-07 11:08:46 -0700 | [diff] [blame] | 316 | /* GSO partial and frag_list segmentation only requires splitting |
| 317 | * the frame into an MSS multiple and possibly a remainder, both |
| 318 | * cases return a GSO skb. So update the mss now. |
| 319 | */ |
| 320 | if (skb_is_gso(segs)) |
| 321 | mss *= skb_shinfo(segs)->gso_segs; |
| 322 | |
Alexander Duyck | 0ad6509 | 2018-05-07 11:08:40 -0700 | [diff] [blame] | 323 | seg = segs; |
| 324 | uh = udp_hdr(seg); |
Alexander Duyck | 9a0d41b | 2018-05-07 11:08:34 -0700 | [diff] [blame] | 325 | |
Fred Klassen | 76e2153 | 2019-06-17 12:05:07 -0700 | [diff] [blame] | 326 | /* preserve TX timestamp flags and TS key for first segment */ |
| 327 | skb_shinfo(seg)->tskey = skb_shinfo(gso_skb)->tskey; |
| 328 | skb_shinfo(seg)->tx_flags |= |
| 329 | (skb_shinfo(gso_skb)->tx_flags & SKBTX_ANY_TSTAMP); |
| 330 | |
Alexander Duyck | 9a0d41b | 2018-05-07 11:08:34 -0700 | [diff] [blame] | 331 | /* compute checksum adjustment based on old length versus new */ |
| 332 | newlen = htons(sizeof(*uh) + mss); |
| 333 | check = csum16_add(csum16_sub(uh->check, uh->len), newlen); |
| 334 | |
Alexander Duyck | 0ad6509 | 2018-05-07 11:08:40 -0700 | [diff] [blame] | 335 | for (;;) { |
Alexander Duyck | 04d55b2 | 2018-05-07 11:08:52 -0700 | [diff] [blame] | 336 | if (copy_dtor) { |
| 337 | seg->destructor = sock_wfree; |
| 338 | seg->sk = sk; |
| 339 | sum_truesize += seg->truesize; |
| 340 | } |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 341 | |
Alexander Duyck | 0ad6509 | 2018-05-07 11:08:40 -0700 | [diff] [blame] | 342 | if (!seg->next) |
| 343 | break; |
Willem de Bruijn | ad40585 | 2018-04-26 13:42:18 -0400 | [diff] [blame] | 344 | |
Alexander Duyck | 9a0d41b | 2018-05-07 11:08:34 -0700 | [diff] [blame] | 345 | uh->len = newlen; |
| 346 | uh->check = check; |
| 347 | |
Alexander Duyck | 6053d0f | 2018-05-07 11:08:46 -0700 | [diff] [blame] | 348 | if (seg->ip_summed == CHECKSUM_PARTIAL) |
| 349 | gso_reset_checksum(seg, ~check); |
| 350 | else |
| 351 | uh->check = gso_make_checksum(seg, ~check) ? : |
| 352 | CSUM_MANGLED_0; |
| 353 | |
Alexander Duyck | 0ad6509 | 2018-05-07 11:08:40 -0700 | [diff] [blame] | 354 | seg = seg->next; |
| 355 | uh = udp_hdr(seg); |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 356 | } |
| 357 | |
Alexander Duyck | 0ad6509 | 2018-05-07 11:08:40 -0700 | [diff] [blame] | 358 | /* last packet can be partial gso_size, account for that in checksum */ |
| 359 | newlen = htons(skb_tail_pointer(seg) - skb_transport_header(seg) + |
| 360 | seg->data_len); |
| 361 | check = csum16_add(csum16_sub(uh->check, uh->len), newlen); |
| 362 | |
| 363 | uh->len = newlen; |
| 364 | uh->check = check; |
| 365 | |
Alexander Duyck | 6053d0f | 2018-05-07 11:08:46 -0700 | [diff] [blame] | 366 | if (seg->ip_summed == CHECKSUM_PARTIAL) |
| 367 | gso_reset_checksum(seg, ~check); |
| 368 | else |
| 369 | uh->check = gso_make_checksum(seg, ~check) ? : CSUM_MANGLED_0; |
| 370 | |
Jakub Sitnicki | 10154db | 2024-06-26 19:51:26 +0200 | [diff] [blame] | 371 | /* On the TX path, CHECKSUM_NONE and CHECKSUM_UNNECESSARY have the same |
| 372 | * meaning. However, check for bad offloads in the GSO stack expects the |
| 373 | * latter, if the checksum was calculated in software. To vouch for the |
| 374 | * segment skbs we actually need to set it on the gso_skb. |
| 375 | */ |
| 376 | if (gso_skb->ip_summed == CHECKSUM_NONE) |
| 377 | gso_skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 378 | |
Alexander Duyck | 0ad6509 | 2018-05-07 11:08:40 -0700 | [diff] [blame] | 379 | /* update refcount for the packet */ |
Eric Dumazet | 575b65b | 2018-05-10 19:07:13 -0700 | [diff] [blame] | 380 | if (copy_dtor) { |
| 381 | int delta = sum_truesize - gso_skb->truesize; |
| 382 | |
| 383 | /* In some pathological cases, delta can be negative. |
| 384 | * We need to either use refcount_add() or refcount_sub_and_test() |
| 385 | */ |
| 386 | if (likely(delta >= 0)) |
| 387 | refcount_add(delta, &sk->sk_wmem_alloc); |
| 388 | else |
| 389 | WARN_ON_ONCE(refcount_sub_and_test(-delta, &sk->sk_wmem_alloc)); |
| 390 | } |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 391 | return segs; |
| 392 | } |
| 393 | EXPORT_SYMBOL_GPL(__udp_gso_segment); |
| 394 | |
Willem de Bruijn | 0c19f846 | 2017-11-21 10:22:25 -0500 | [diff] [blame] | 395 | static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb, |
| 396 | netdev_features_t features) |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 397 | { |
| 398 | struct sk_buff *segs = ERR_PTR(-EINVAL); |
Willem de Bruijn | 0c19f846 | 2017-11-21 10:22:25 -0500 | [diff] [blame] | 399 | unsigned int mss; |
| 400 | __wsum csum; |
| 401 | struct udphdr *uh; |
| 402 | struct iphdr *iph; |
Wei-Chun Chao | 7a7ffba | 2013-12-26 13:10:22 -0800 | [diff] [blame] | 403 | |
| 404 | if (skb->encapsulation && |
Tom Herbert | 0f4f4ff | 2014-06-04 17:20:16 -0700 | [diff] [blame] | 405 | (skb_shinfo(skb)->gso_type & |
Willem de Bruijn | 0c19f846 | 2017-11-21 10:22:25 -0500 | [diff] [blame] | 406 | (SKB_GSO_UDP_TUNNEL|SKB_GSO_UDP_TUNNEL_CSUM))) { |
Tom Herbert | 8bce6d7 | 2014-09-29 20:22:29 -0700 | [diff] [blame] | 407 | segs = skb_udp_tunnel_segment(skb, features, false); |
Willem de Bruijn | 0c19f846 | 2017-11-21 10:22:25 -0500 | [diff] [blame] | 408 | goto out; |
| 409 | } |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 410 | |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 411 | 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] | 412 | goto out; |
| 413 | |
Willem de Bruijn | 0c19f846 | 2017-11-21 10:22:25 -0500 | [diff] [blame] | 414 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
| 415 | goto out; |
| 416 | |
Yan Zhai | 9840036 | 2023-07-13 10:28:00 -0700 | [diff] [blame] | 417 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) |
Dongseok Yi | c3df39a | 2021-01-30 08:13:27 +0900 | [diff] [blame] | 418 | return __udp_gso_segment(skb, features, false); |
Willem de Bruijn | ee80d1e | 2018-04-26 13:42:16 -0400 | [diff] [blame] | 419 | |
Willem de Bruijn | 0c19f846 | 2017-11-21 10:22:25 -0500 | [diff] [blame] | 420 | mss = skb_shinfo(skb)->gso_size; |
| 421 | if (unlikely(skb->len <= mss)) |
| 422 | goto out; |
| 423 | |
| 424 | /* Do software UFO. Complete and fill in the UDP checksum as |
| 425 | * HW cannot do checksum of UDP packets sent as multiple |
| 426 | * IP fragments. |
| 427 | */ |
| 428 | |
| 429 | uh = udp_hdr(skb); |
| 430 | iph = ip_hdr(skb); |
| 431 | |
| 432 | uh->check = 0; |
| 433 | csum = skb_checksum(skb, 0, skb->len, 0); |
| 434 | uh->check = udp_v4_check(skb->len, iph->saddr, iph->daddr, csum); |
| 435 | if (uh->check == 0) |
| 436 | uh->check = CSUM_MANGLED_0; |
| 437 | |
| 438 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 439 | |
| 440 | /* If there is no outer header we can fake a checksum offload |
| 441 | * due to the fact that we have already done the checksum in |
| 442 | * software prior to segmenting the frame. |
| 443 | */ |
| 444 | if (!skb->encap_hdr_csum) |
| 445 | features |= NETIF_F_HW_CSUM; |
| 446 | |
| 447 | /* Fragment the skb. IP headers of the fragments are updated in |
| 448 | * inet_gso_segment() |
| 449 | */ |
| 450 | segs = skb_segment(skb, features); |
| 451 | out: |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 452 | return segs; |
| 453 | } |
| 454 | |
Eric Dumazet | 0b935d7 | 2021-11-15 09:05:52 -0800 | [diff] [blame] | 455 | |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 456 | #define UDP_GRO_CNT_MAX 64 |
| 457 | static struct sk_buff *udp_gro_receive_segment(struct list_head *head, |
| 458 | struct sk_buff *skb) |
| 459 | { |
Alexander Lobakin | 4b1a862 | 2020-11-11 20:45:25 +0000 | [diff] [blame] | 460 | struct udphdr *uh = udp_gro_udphdr(skb); |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 461 | struct sk_buff *pp = NULL; |
| 462 | struct udphdr *uh2; |
| 463 | struct sk_buff *p; |
Eric Dumazet | 4dd2b82 | 2019-05-01 18:56:28 -0700 | [diff] [blame] | 464 | unsigned int ulen; |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 465 | int ret = 0; |
Richard Gobert | 5babae7 | 2024-04-30 16:35:55 +0200 | [diff] [blame] | 466 | int flush; |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 467 | |
| 468 | /* requires non zero csum, for symmetry with GSO */ |
| 469 | if (!uh->check) { |
| 470 | NAPI_GRO_CB(skb)->flush = 1; |
| 471 | return NULL; |
| 472 | } |
| 473 | |
Eric Dumazet | 4dd2b82 | 2019-05-01 18:56:28 -0700 | [diff] [blame] | 474 | /* Do not deal with padded or malicious packets, sorry ! */ |
| 475 | ulen = ntohs(uh->len); |
| 476 | if (ulen <= sizeof(*uh) || ulen != skb_gro_len(skb)) { |
| 477 | NAPI_GRO_CB(skb)->flush = 1; |
| 478 | return NULL; |
| 479 | } |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 480 | /* pull encapsulating udp header */ |
| 481 | skb_gro_pull(skb, sizeof(struct udphdr)); |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 482 | |
| 483 | list_for_each_entry(p, head, list) { |
| 484 | if (!NAPI_GRO_CB(p)->same_flow) |
| 485 | continue; |
| 486 | |
| 487 | uh2 = udp_hdr(p); |
| 488 | |
| 489 | /* Match ports only, as csum is always non zero */ |
| 490 | if ((*(u32 *)&uh->source != *(u32 *)&uh2->source)) { |
| 491 | NAPI_GRO_CB(p)->same_flow = 0; |
| 492 | continue; |
| 493 | } |
| 494 | |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 495 | if (NAPI_GRO_CB(skb)->is_flist != NAPI_GRO_CB(p)->is_flist) { |
| 496 | NAPI_GRO_CB(skb)->flush = 1; |
| 497 | return p; |
| 498 | } |
| 499 | |
Richard Gobert | 4b0ebbc | 2024-05-09 21:08:18 +0200 | [diff] [blame] | 500 | flush = gro_receive_network_flush(uh, uh2, p); |
Richard Gobert | 5babae7 | 2024-04-30 16:35:55 +0200 | [diff] [blame] | 501 | |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 502 | /* Terminate the flow on len mismatch or if it grow "too much". |
| 503 | * Under small packet flood GRO count could elsewhere grow a lot |
Eric Dumazet | 4dd2b82 | 2019-05-01 18:56:28 -0700 | [diff] [blame] | 504 | * leading to excessive truesize values. |
Paolo Abeni | 21f1b8a | 2019-04-26 12:50:44 +0200 | [diff] [blame] | 505 | * On len mismatch merge the first packet shorter than gso_size, |
| 506 | * otherwise complete the GRO packet. |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 507 | */ |
Richard Gobert | 5babae7 | 2024-04-30 16:35:55 +0200 | [diff] [blame] | 508 | if (ulen > ntohs(uh2->len) || flush) { |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 509 | pp = p; |
| 510 | } else { |
| 511 | if (NAPI_GRO_CB(skb)->is_flist) { |
| 512 | if (!pskb_may_pull(skb, skb_gro_offset(skb))) { |
| 513 | NAPI_GRO_CB(skb)->flush = 1; |
| 514 | return NULL; |
| 515 | } |
| 516 | if ((skb->ip_summed != p->ip_summed) || |
| 517 | (skb->csum_level != p->csum_level)) { |
| 518 | NAPI_GRO_CB(skb)->flush = 1; |
| 519 | return NULL; |
| 520 | } |
| 521 | ret = skb_gro_receive_list(p, skb); |
| 522 | } else { |
| 523 | skb_gro_postpull_rcsum(skb, uh, |
| 524 | sizeof(struct udphdr)); |
| 525 | |
| 526 | ret = skb_gro_receive(p, skb); |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | if (ret || ulen != ntohs(uh2->len) || |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 531 | NAPI_GRO_CB(p)->count >= UDP_GRO_CNT_MAX) |
| 532 | pp = p; |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 533 | |
| 534 | return pp; |
| 535 | } |
| 536 | |
| 537 | /* mismatch, but we never need to flush */ |
| 538 | return NULL; |
| 539 | } |
| 540 | |
David Miller | d4546c2 | 2018-06-24 14:13:49 +0900 | [diff] [blame] | 541 | 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] | 542 | struct udphdr *uh, struct sock *sk) |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 543 | { |
David Miller | d4546c2 | 2018-06-24 14:13:49 +0900 | [diff] [blame] | 544 | struct sk_buff *pp = NULL; |
| 545 | struct sk_buff *p; |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 546 | struct udphdr *uh2; |
| 547 | unsigned int off = skb_gro_offset(skb); |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 548 | int flush = 1; |
| 549 | |
Antoine Tenart | 3d010c8 | 2024-03-26 12:33:58 +0100 | [diff] [blame] | 550 | /* We can do L4 aggregation only if the packet can't land in a tunnel |
| 551 | * otherwise we could corrupt the inner stream. Detecting such packets |
| 552 | * cannot be foolproof and the aggregation might still happen in some |
| 553 | * cases. Such packets should be caught in udp_unexpected_gso later. |
Paolo Abeni | 18f25dc | 2021-03-30 12:28:50 +0200 | [diff] [blame] | 554 | */ |
Xin Long | bde1b56 | 2020-03-30 23:31:45 +0800 | [diff] [blame] | 555 | NAPI_GRO_CB(skb)->is_flist = 0; |
Paolo Abeni | 18f25dc | 2021-03-30 12:28:50 +0200 | [diff] [blame] | 556 | if (!sk || !udp_sk(sk)->gro_receive) { |
Antoine Tenart | 64235ea | 2024-03-26 12:34:01 +0100 | [diff] [blame] | 557 | /* If the packet was locally encapsulated in a UDP tunnel that |
| 558 | * wasn't detected above, do not GRO. |
| 559 | */ |
| 560 | if (skb->encapsulation) |
| 561 | goto out; |
| 562 | |
Paolo Abeni | 18f25dc | 2021-03-30 12:28:50 +0200 | [diff] [blame] | 563 | if (skb->dev->features & NETIF_F_GRO_FRAGLIST) |
Eric Dumazet | e1dc0615 | 2023-09-12 09:17:24 +0000 | [diff] [blame] | 564 | 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] | 565 | |
Paolo Abeni | 18f25dc | 2021-03-30 12:28:50 +0200 | [diff] [blame] | 566 | if ((!sk && (skb->dev->features & NETIF_F_GRO_UDP_FWD)) || |
Eric Dumazet | e1dc0615 | 2023-09-12 09:17:24 +0000 | [diff] [blame] | 567 | (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] | 568 | return call_gro_receive(udp_gro_receive_segment, head, skb); |
| 569 | |
| 570 | /* no GRO, be sure flush the current packet */ |
| 571 | goto out; |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 572 | } |
| 573 | |
Paolo Abeni | 18f25dc | 2021-03-30 12:28:50 +0200 | [diff] [blame] | 574 | if (NAPI_GRO_CB(skb)->encap_mark || |
Daniel Borkmann | 89e5c58 | 2021-02-26 22:22:48 +0100 | [diff] [blame] | 575 | (uh->check && skb->ip_summed != CHECKSUM_PARTIAL && |
Tom Herbert | 662880f | 2014-08-27 21:26:56 -0700 | [diff] [blame] | 576 | NAPI_GRO_CB(skb)->csum_cnt == 0 && |
Paolo Abeni | 18f25dc | 2021-03-30 12:28:50 +0200 | [diff] [blame] | 577 | !NAPI_GRO_CB(skb)->csum_valid)) |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 578 | goto out; |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 579 | |
Jesse Gross | fac8e0f | 2016-03-19 09:32:01 -0700 | [diff] [blame] | 580 | /* mark that this skb passed once through the tunnel gro layer */ |
| 581 | NAPI_GRO_CB(skb)->encap_mark = 1; |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 582 | |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 583 | flush = 0; |
| 584 | |
David Miller | d4546c2 | 2018-06-24 14:13:49 +0900 | [diff] [blame] | 585 | list_for_each_entry(p, head, list) { |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 586 | if (!NAPI_GRO_CB(p)->same_flow) |
| 587 | continue; |
| 588 | |
| 589 | uh2 = (struct udphdr *)(p->data + off); |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 590 | |
| 591 | /* Match ports and either checksums are either both zero |
| 592 | * or nonzero. |
| 593 | */ |
| 594 | if ((*(u32 *)&uh->source != *(u32 *)&uh2->source) || |
| 595 | (!uh->check ^ !uh2->check)) { |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 596 | NAPI_GRO_CB(p)->same_flow = 0; |
| 597 | continue; |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | skb_gro_pull(skb, sizeof(struct udphdr)); /* pull encapsulating udp header */ |
Tom Herbert | 6bae1d4 | 2014-06-10 18:54:26 -0700 | [diff] [blame] | 602 | skb_gro_postpull_rcsum(skb, uh, sizeof(struct udphdr)); |
Sabrina Dubroca | fcd91dd | 2016-10-20 15:58:02 +0200 | [diff] [blame] | 603 | 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] | 604 | |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 605 | out: |
Sabrina Dubroca | 603d4cf | 2018-06-30 17:38:55 +0200 | [diff] [blame] | 606 | skb_gro_flush_final(skb, pp, flush); |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 607 | return pp; |
| 608 | } |
Tom Herbert | a602456 | 2016-04-05 08:22:51 -0700 | [diff] [blame] | 609 | EXPORT_SYMBOL(udp_gro_receive); |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 610 | |
Alexander Lobakin | 55e7298 | 2020-11-11 20:45:38 +0000 | [diff] [blame] | 611 | static struct sock *udp4_gro_lookup_skb(struct sk_buff *skb, __be16 sport, |
| 612 | __be16 dport) |
| 613 | { |
| 614 | const struct iphdr *iph = skb_gro_network_header(skb); |
Kuniyuki Iwashima | ba6aac1 | 2022-11-14 13:57:56 -0800 | [diff] [blame] | 615 | struct net *net = dev_net(skb->dev); |
Richard Gobert | 7938cd1 | 2023-07-27 17:33:56 +0200 | [diff] [blame] | 616 | int iif, sdif; |
| 617 | |
| 618 | inet_get_iif_sdif(skb, &iif, &sdif); |
Alexander Lobakin | 55e7298 | 2020-11-11 20:45:38 +0000 | [diff] [blame] | 619 | |
Kuniyuki Iwashima | ba6aac1 | 2022-11-14 13:57:56 -0800 | [diff] [blame] | 620 | return __udp4_lib_lookup(net, iph->saddr, sport, |
Richard Gobert | 7938cd1 | 2023-07-27 17:33:56 +0200 | [diff] [blame] | 621 | iph->daddr, dport, iif, |
| 622 | sdif, net->ipv4.udp_table, NULL); |
Alexander Lobakin | 55e7298 | 2020-11-11 20:45:38 +0000 | [diff] [blame] | 623 | } |
| 624 | |
Paolo Abeni | 028e0a4 | 2018-12-14 11:51:59 +0100 | [diff] [blame] | 625 | INDIRECT_CALLABLE_SCOPE |
| 626 | 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] | 627 | { |
| 628 | struct udphdr *uh = udp_gro_udphdr(skb); |
Alexander Lobakin | 55e7298 | 2020-11-11 20:45:38 +0000 | [diff] [blame] | 629 | struct sock *sk = NULL; |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 630 | struct sk_buff *pp; |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 631 | |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 632 | if (unlikely(!uh)) |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 633 | goto flush; |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 634 | |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 635 | /* Don't bother verifying checksum if we're going to flush anyway. */ |
Scott Wood | 2d8f7e2 | 2014-09-10 21:23:18 -0500 | [diff] [blame] | 636 | if (NAPI_GRO_CB(skb)->flush) |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 637 | goto skip; |
| 638 | |
| 639 | if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check, |
| 640 | inet_gro_compute_pseudo)) |
| 641 | goto flush; |
| 642 | else if (uh->check) |
Li RongQing | b39c78b | 2020-01-03 11:51:00 +0800 | [diff] [blame] | 643 | skb_gro_checksum_try_convert(skb, IPPROTO_UDP, |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 644 | inet_gro_compute_pseudo); |
| 645 | skip: |
Tom Herbert | efc98d0 | 2014-10-03 15:48:08 -0700 | [diff] [blame] | 646 | NAPI_GRO_CB(skb)->is_ipv6 = 0; |
Alexander Lobakin | 55e7298 | 2020-11-11 20:45:38 +0000 | [diff] [blame] | 647 | |
| 648 | if (static_branch_unlikely(&udp_encap_needed_key)) |
| 649 | sk = udp4_gro_lookup_skb(skb, uh->source, uh->dest); |
| 650 | |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 651 | pp = udp_gro_receive(head, skb, uh, sk); |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 652 | return pp; |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 653 | |
| 654 | flush: |
| 655 | NAPI_GRO_CB(skb)->flush = 1; |
| 656 | return NULL; |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 657 | } |
| 658 | |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 659 | static int udp_gro_complete_segment(struct sk_buff *skb) |
| 660 | { |
| 661 | struct udphdr *uh = udp_hdr(skb); |
| 662 | |
| 663 | skb->csum_start = (unsigned char *)uh - skb->head; |
| 664 | skb->csum_offset = offsetof(struct udphdr, check); |
| 665 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 666 | |
| 667 | skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count; |
| 668 | skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_L4; |
Jakub Sitnicki | d51c590 | 2021-07-29 15:48:20 +0200 | [diff] [blame] | 669 | |
| 670 | if (skb->encapsulation) |
| 671 | skb->inner_transport_header = skb->transport_header; |
| 672 | |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 673 | return 0; |
| 674 | } |
| 675 | |
Tom Herbert | a602456 | 2016-04-05 08:22:51 -0700 | [diff] [blame] | 676 | int udp_gro_complete(struct sk_buff *skb, int nhoff, |
| 677 | udp_lookup_t lookup) |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 678 | { |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 679 | __be16 newlen = htons(skb->len - nhoff); |
| 680 | struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); |
Tom Herbert | a602456 | 2016-04-05 08:22:51 -0700 | [diff] [blame] | 681 | struct sock *sk; |
Menglong Dong | cef2119 | 2020-11-09 21:57:58 -0500 | [diff] [blame] | 682 | int err; |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 683 | |
| 684 | uh->len = newlen; |
| 685 | |
Paolo Abeni | 4f24ed7 | 2018-12-14 11:52:00 +0100 | [diff] [blame] | 686 | sk = INDIRECT_CALL_INET(lookup, udp6_lib_lookup_skb, |
| 687 | udp4_lib_lookup_skb, skb, uh->source, uh->dest); |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 688 | if (sk && udp_sk(sk)->gro_complete) { |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 689 | skb_shinfo(skb)->gso_type = uh->check ? SKB_GSO_UDP_TUNNEL_CSUM |
| 690 | : SKB_GSO_UDP_TUNNEL; |
| 691 | |
Paolo Abeni | e0e3070 | 2021-03-30 12:28:51 +0200 | [diff] [blame] | 692 | /* clear the encap mark, so that inner frag_list gro_complete |
| 693 | * can take place |
| 694 | */ |
| 695 | NAPI_GRO_CB(skb)->encap_mark = 0; |
| 696 | |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 697 | /* Set encapsulation before calling into inner gro_complete() |
| 698 | * functions to make them set up the inner offsets. |
| 699 | */ |
| 700 | skb->encapsulation = 1; |
Tom Herbert | a602456 | 2016-04-05 08:22:51 -0700 | [diff] [blame] | 701 | err = udp_sk(sk)->gro_complete(sk, skb, |
| 702 | nhoff + sizeof(struct udphdr)); |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 703 | } else { |
| 704 | err = udp_gro_complete_segment(skb); |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 705 | } |
Tom Herbert | 6db93ea | 2015-02-10 16:30:29 -0800 | [diff] [blame] | 706 | |
| 707 | if (skb->remcsum_offload) |
| 708 | skb_shinfo(skb)->gso_type |= SKB_GSO_TUNNEL_REMCSUM; |
| 709 | |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 710 | return err; |
| 711 | } |
Tom Herbert | a602456 | 2016-04-05 08:22:51 -0700 | [diff] [blame] | 712 | EXPORT_SYMBOL(udp_gro_complete); |
Or Gerlitz | b582ef0 | 2014-01-20 13:59:19 +0200 | [diff] [blame] | 713 | |
Paolo Abeni | 028e0a4 | 2018-12-14 11:51:59 +0100 | [diff] [blame] | 714 | 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] | 715 | { |
Richard Gobert | 5ef31ea | 2024-04-30 16:35:54 +0200 | [diff] [blame] | 716 | const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation]; |
| 717 | const struct iphdr *iph = (struct iphdr *)(skb->data + offset); |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 718 | struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); |
| 719 | |
Paolo Abeni | e0e3070 | 2021-03-30 12:28:51 +0200 | [diff] [blame] | 720 | /* do fraglist only if there is no outer UDP encap (or we already processed it) */ |
| 721 | 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] | 722 | uh->len = htons(skb->len - nhoff); |
| 723 | |
| 724 | skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4); |
| 725 | skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count; |
| 726 | |
Antoine Tenart | f0b8c30 | 2024-03-26 12:34:00 +0100 | [diff] [blame] | 727 | __skb_incr_checksum_unnecessary(skb); |
Steffen Klassert | 9fd1ff5 | 2020-01-25 11:26:45 +0100 | [diff] [blame] | 728 | |
| 729 | return 0; |
| 730 | } |
| 731 | |
Paolo Abeni | e20cf8d | 2018-11-07 12:38:29 +0100 | [diff] [blame] | 732 | if (uh->check) |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 733 | uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr, |
| 734 | iph->daddr, 0); |
| 735 | |
Tom Herbert | a602456 | 2016-04-05 08:22:51 -0700 | [diff] [blame] | 736 | return udp_gro_complete(skb, nhoff, udp4_lib_lookup_skb); |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 737 | } |
| 738 | |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 739 | int __init udpv4_offload_init(void) |
| 740 | { |
Eric Dumazet | 6a55ca6 | 2024-03-06 16:00:24 +0000 | [diff] [blame] | 741 | net_hotdata.udpv4_offload = (struct net_offload) { |
| 742 | .callbacks = { |
| 743 | .gso_segment = udp4_ufo_fragment, |
| 744 | .gro_receive = udp4_gro_receive, |
| 745 | .gro_complete = udp4_gro_complete, |
| 746 | }, |
| 747 | }; |
| 748 | return inet_add_offload(&net_hotdata.udpv4_offload, IPPROTO_UDP); |
Daniel Borkmann | da5bab0 | 2013-06-08 12:56:03 +0200 | [diff] [blame] | 749 | } |