^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * IPV4 GSO/GRO offload support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Linux INET implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * UDPv4 GSO support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <net/udp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <net/inet_common.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) netdev_features_t features,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) struct sk_buff *(*gso_inner_segment)(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) netdev_features_t features),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) __be16 new_protocol, bool is_ipv6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) bool remcsum, need_csum, offload_csum, gso_partial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct sk_buff *segs = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct udphdr *uh = udp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) u16 mac_offset = skb->mac_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) __be16 protocol = skb->protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) u16 mac_len = skb->mac_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int udp_offset, outer_hlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) __wsum partial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) bool need_ipsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if (unlikely(!pskb_may_pull(skb, tnl_hlen)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /* Adjust partial header checksum to negate old length.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * We cannot rely on the value contained in uh->len as it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * possible that the actual value exceeds the boundaries of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * 16 bit length field due to the header being added outside of an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * IP or IPv6 frame that was already limited to 64K - 1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) partial = (__force __wsum)uh->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) partial = (__force __wsum)htonl(skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) partial = csum_sub(csum_unfold(uh->check), partial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) /* setup inner skb. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) skb->encapsulation = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) SKB_GSO_CB(skb)->encap_level = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) __skb_pull(skb, tnl_hlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) skb_reset_mac_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) skb_set_network_header(skb, skb_inner_network_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) skb->mac_len = skb_inner_network_offset(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) skb->protocol = new_protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) need_csum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) skb->encap_hdr_csum = need_csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) remcsum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TUNNEL_REMCSUM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) skb->remcsum_offload = remcsum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) need_ipsec = skb_dst(skb) && dst_xfrm(skb_dst(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /* Try to offload checksum if possible */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) offload_csum = !!(need_csum &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) !need_ipsec &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) (skb->dev->features &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) (is_ipv6 ? (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM) :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM))));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) features &= skb->dev->hw_enc_features;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /* The only checksum offload we care about from here on out is the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * outer one so strip the existing checksum feature flags and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * instead set the flag based on our outer checksum offload value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (remcsum) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) features &= ~NETIF_F_CSUM_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (!need_csum || offload_csum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) features |= NETIF_F_HW_CSUM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /* segment inner packet. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) segs = gso_inner_segment(skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (IS_ERR_OR_NULL(segs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) skb_gso_error_unwind(skb, protocol, tnl_hlen, mac_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) mac_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) outer_hlen = skb_tnl_header_len(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) udp_offset = outer_hlen - tnl_hlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) skb = segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (remcsum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) skb->ip_summed = CHECKSUM_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /* Set up inner headers if we are offloading inner checksum */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (skb->ip_summed == CHECKSUM_PARTIAL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) skb_reset_inner_headers(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) skb->encapsulation = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) skb->mac_len = mac_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) skb->protocol = protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) __skb_push(skb, outer_hlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) skb_reset_mac_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) skb_set_network_header(skb, mac_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) skb_set_transport_header(skb, udp_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) len = skb->len - udp_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) uh = udp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /* If we are only performing partial GSO the inner header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * will be using a length value equal to only one MSS sized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * segment instead of the entire frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (gso_partial && skb_is_gso(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) uh->len = htons(skb_shinfo(skb)->gso_size +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) SKB_GSO_CB(skb)->data_offset +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) skb->head - (unsigned char *)uh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) uh->len = htons(len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (!need_csum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) uh->check = ~csum_fold(csum_add(partial,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) (__force __wsum)htonl(len)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (skb->encapsulation || !offload_csum) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) uh->check = gso_make_checksum(skb, ~uh->check);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (uh->check == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) uh->check = CSUM_MANGLED_0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) skb->ip_summed = CHECKSUM_PARTIAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) skb->csum_start = skb_transport_header(skb) - skb->head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) skb->csum_offset = offsetof(struct udphdr, check);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) } while ((skb = skb->next));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) netdev_features_t features,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) bool is_ipv6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) __be16 protocol = skb->protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) const struct net_offload **offloads;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) const struct net_offload *ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) struct sk_buff *segs = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) struct sk_buff *(*gso_inner_segment)(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) netdev_features_t features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) switch (skb->inner_protocol_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) case ENCAP_TYPE_ETHER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) protocol = skb->inner_protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) gso_inner_segment = skb_mac_gso_segment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) case ENCAP_TYPE_IPPROTO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) offloads = is_ipv6 ? inet6_offloads : inet_offloads;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) ops = rcu_dereference(offloads[skb->inner_ipproto]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) if (!ops || !ops->callbacks.gso_segment)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) gso_inner_segment = ops->callbacks.gso_segment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) segs = __skb_udp_tunnel_segment(skb, features, gso_inner_segment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) protocol, is_ipv6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) EXPORT_SYMBOL(skb_udp_tunnel_segment);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) static void __udpv4_gso_segment_csum(struct sk_buff *seg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) __be32 *oldip, __be32 *newip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) __be16 *oldport, __be16 *newport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) struct udphdr *uh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) struct iphdr *iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (*oldip == *newip && *oldport == *newport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) uh = udp_hdr(seg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) iph = ip_hdr(seg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (uh->check) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) inet_proto_csum_replace4(&uh->check, seg, *oldip, *newip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) inet_proto_csum_replace2(&uh->check, seg, *oldport, *newport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if (!uh->check)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) uh->check = CSUM_MANGLED_0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) *oldport = *newport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) csum_replace4(&iph->check, *oldip, *newip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) *oldip = *newip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) static struct sk_buff *__udpv4_gso_segment_list_csum(struct sk_buff *segs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) struct sk_buff *seg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) struct udphdr *uh, *uh2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) struct iphdr *iph, *iph2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) seg = segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) uh = udp_hdr(seg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) iph = ip_hdr(seg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if ((udp_hdr(seg)->dest == udp_hdr(seg->next)->dest) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) (udp_hdr(seg)->source == udp_hdr(seg->next)->source) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) (ip_hdr(seg)->daddr == ip_hdr(seg->next)->daddr) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) (ip_hdr(seg)->saddr == ip_hdr(seg->next)->saddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) while ((seg = seg->next)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) uh2 = udp_hdr(seg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) iph2 = ip_hdr(seg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) __udpv4_gso_segment_csum(seg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) &iph2->saddr, &iph->saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) &uh2->source, &uh->source);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) __udpv4_gso_segment_csum(seg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) &iph2->daddr, &iph->daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) &uh2->dest, &uh->dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) static struct sk_buff *__udp_gso_segment_list(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) netdev_features_t features,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) bool is_ipv6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) unsigned int mss = skb_shinfo(skb)->gso_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) skb = skb_segment_list(skb, features, skb_mac_header_len(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (IS_ERR(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) udp_hdr(skb)->len = htons(sizeof(struct udphdr) + mss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return is_ipv6 ? skb : __udpv4_gso_segment_list_csum(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) netdev_features_t features, bool is_ipv6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) struct sock *sk = gso_skb->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) unsigned int sum_truesize = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) struct sk_buff *segs, *seg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) struct udphdr *uh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) unsigned int mss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) bool copy_dtor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) __sum16 check;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) __be16 newlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (skb_shinfo(gso_skb)->gso_type & SKB_GSO_FRAGLIST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) return __udp_gso_segment_list(gso_skb, features, is_ipv6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) mss = skb_shinfo(gso_skb)->gso_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (gso_skb->len <= sizeof(*uh) + mss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) skb_pull(gso_skb, sizeof(*uh));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) /* clear destructor to avoid skb_segment assigning it to tail */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) copy_dtor = gso_skb->destructor == sock_wfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (copy_dtor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) gso_skb->destructor = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) segs = skb_segment(gso_skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) if (IS_ERR_OR_NULL(segs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) if (copy_dtor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) gso_skb->destructor = sock_wfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) return segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) /* GSO partial and frag_list segmentation only requires splitting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) * the frame into an MSS multiple and possibly a remainder, both
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) * cases return a GSO skb. So update the mss now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) if (skb_is_gso(segs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) mss *= skb_shinfo(segs)->gso_segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) seg = segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) uh = udp_hdr(seg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) /* preserve TX timestamp flags and TS key for first segment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) skb_shinfo(seg)->tskey = skb_shinfo(gso_skb)->tskey;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) skb_shinfo(seg)->tx_flags |=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) (skb_shinfo(gso_skb)->tx_flags & SKBTX_ANY_TSTAMP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) /* compute checksum adjustment based on old length versus new */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) newlen = htons(sizeof(*uh) + mss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) check = csum16_add(csum16_sub(uh->check, uh->len), newlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) if (copy_dtor) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) seg->destructor = sock_wfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) seg->sk = sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) sum_truesize += seg->truesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (!seg->next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) uh->len = newlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) uh->check = check;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) if (seg->ip_summed == CHECKSUM_PARTIAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) gso_reset_checksum(seg, ~check);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) uh->check = gso_make_checksum(seg, ~check) ? :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) CSUM_MANGLED_0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) seg = seg->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) uh = udp_hdr(seg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) /* last packet can be partial gso_size, account for that in checksum */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) newlen = htons(skb_tail_pointer(seg) - skb_transport_header(seg) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) seg->data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) check = csum16_add(csum16_sub(uh->check, uh->len), newlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) uh->len = newlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) uh->check = check;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (seg->ip_summed == CHECKSUM_PARTIAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) gso_reset_checksum(seg, ~check);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) uh->check = gso_make_checksum(seg, ~check) ? : CSUM_MANGLED_0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) /* update refcount for the packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) if (copy_dtor) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) int delta = sum_truesize - gso_skb->truesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) /* In some pathological cases, delta can be negative.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * We need to either use refcount_add() or refcount_sub_and_test()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if (likely(delta >= 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) refcount_add(delta, &sk->sk_wmem_alloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) WARN_ON_ONCE(refcount_sub_and_test(-delta, &sk->sk_wmem_alloc));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) return segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) EXPORT_SYMBOL_GPL(__udp_gso_segment);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) struct sk_buff *segs = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) unsigned int mss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) __wsum csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) struct udphdr *uh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) struct iphdr *iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) if (skb->encapsulation &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) (skb_shinfo(skb)->gso_type &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) (SKB_GSO_UDP_TUNNEL|SKB_GSO_UDP_TUNNEL_CSUM))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) segs = skb_udp_tunnel_segment(skb, features, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (!(skb_shinfo(skb)->gso_type & (SKB_GSO_UDP | SKB_GSO_UDP_L4)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) if (!pskb_may_pull(skb, sizeof(struct udphdr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) return __udp_gso_segment(skb, features, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) mss = skb_shinfo(skb)->gso_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) if (unlikely(skb->len <= mss))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) /* Do software UFO. Complete and fill in the UDP checksum as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) * HW cannot do checksum of UDP packets sent as multiple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) * IP fragments.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) uh = udp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) iph = ip_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) uh->check = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) csum = skb_checksum(skb, 0, skb->len, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) uh->check = udp_v4_check(skb->len, iph->saddr, iph->daddr, csum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) if (uh->check == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) uh->check = CSUM_MANGLED_0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) skb->ip_summed = CHECKSUM_UNNECESSARY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) /* If there is no outer header we can fake a checksum offload
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) * due to the fact that we have already done the checksum in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) * software prior to segmenting the frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) if (!skb->encap_hdr_csum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) features |= NETIF_F_HW_CSUM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) /* Fragment the skb. IP headers of the fragments are updated in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * inet_gso_segment()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) segs = skb_segment(skb, features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) return segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) #define UDP_GRO_CNT_MAX 64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) static struct sk_buff *udp_gro_receive_segment(struct list_head *head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) struct udphdr *uh = udp_gro_udphdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) struct sk_buff *pp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) struct udphdr *uh2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) struct sk_buff *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) unsigned int ulen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) /* requires non zero csum, for symmetry with GSO */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) if (!uh->check) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) NAPI_GRO_CB(skb)->flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) /* Do not deal with padded or malicious packets, sorry ! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) ulen = ntohs(uh->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) if (ulen <= sizeof(*uh) || ulen != skb_gro_len(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) NAPI_GRO_CB(skb)->flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) /* pull encapsulating udp header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) skb_gro_pull(skb, sizeof(struct udphdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) list_for_each_entry(p, head, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) if (!NAPI_GRO_CB(p)->same_flow)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) uh2 = udp_hdr(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) /* Match ports only, as csum is always non zero */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) if ((*(u32 *)&uh->source != *(u32 *)&uh2->source)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) NAPI_GRO_CB(p)->same_flow = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (NAPI_GRO_CB(skb)->is_flist != NAPI_GRO_CB(p)->is_flist) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) NAPI_GRO_CB(skb)->flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) /* Terminate the flow on len mismatch or if it grow "too much".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) * Under small packet flood GRO count could elsewhere grow a lot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) * leading to excessive truesize values.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) * On len mismatch merge the first packet shorter than gso_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) * otherwise complete the GRO packet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) if (ulen > ntohs(uh2->len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) pp = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) if (NAPI_GRO_CB(skb)->is_flist) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (!pskb_may_pull(skb, skb_gro_offset(skb))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) NAPI_GRO_CB(skb)->flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) if ((skb->ip_summed != p->ip_summed) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) (skb->csum_level != p->csum_level)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) NAPI_GRO_CB(skb)->flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) ret = skb_gro_receive_list(p, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) skb_gro_postpull_rcsum(skb, uh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) sizeof(struct udphdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) ret = skb_gro_receive(p, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) if (ret || ulen != ntohs(uh2->len) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) NAPI_GRO_CB(p)->count >= UDP_GRO_CNT_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) pp = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) return pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) /* mismatch, but we never need to flush */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) struct udphdr *uh, struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) struct sk_buff *pp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) struct sk_buff *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) struct udphdr *uh2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) unsigned int off = skb_gro_offset(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) int flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) NAPI_GRO_CB(skb)->is_flist = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) if (skb->dev->features & NETIF_F_GRO_FRAGLIST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) NAPI_GRO_CB(skb)->is_flist = sk ? !udp_sk(sk)->gro_enabled: 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) if ((sk && udp_sk(sk)->gro_enabled) || NAPI_GRO_CB(skb)->is_flist) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) pp = call_gro_receive(udp_gro_receive_segment, head, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) return pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) if (!sk || NAPI_GRO_CB(skb)->encap_mark ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) (uh->check && skb->ip_summed != CHECKSUM_PARTIAL &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) NAPI_GRO_CB(skb)->csum_cnt == 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) !NAPI_GRO_CB(skb)->csum_valid) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) !udp_sk(sk)->gro_receive)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) /* mark that this skb passed once through the tunnel gro layer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) NAPI_GRO_CB(skb)->encap_mark = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) flush = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) list_for_each_entry(p, head, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) if (!NAPI_GRO_CB(p)->same_flow)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) uh2 = (struct udphdr *)(p->data + off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) /* Match ports and either checksums are either both zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) * or nonzero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) if ((*(u32 *)&uh->source != *(u32 *)&uh2->source) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) (!uh->check ^ !uh2->check)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) NAPI_GRO_CB(p)->same_flow = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) skb_gro_pull(skb, sizeof(struct udphdr)); /* pull encapsulating udp header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) skb_gro_postpull_rcsum(skb, uh, sizeof(struct udphdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) pp = call_gro_receive_sk(udp_sk(sk)->gro_receive, sk, head, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) skb_gro_flush_final(skb, pp, flush);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) return pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) EXPORT_SYMBOL(udp_gro_receive);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) static struct sock *udp4_gro_lookup_skb(struct sk_buff *skb, __be16 sport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) __be16 dport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) const struct iphdr *iph = skb_gro_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) return __udp4_lib_lookup(dev_net(skb->dev), iph->saddr, sport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) iph->daddr, dport, inet_iif(skb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) inet_sdif(skb), &udp_table, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) INDIRECT_CALLABLE_SCOPE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) struct sk_buff *udp4_gro_receive(struct list_head *head, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) struct udphdr *uh = udp_gro_udphdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) struct sock *sk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) struct sk_buff *pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) if (unlikely(!uh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) goto flush;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) /* Don't bother verifying checksum if we're going to flush anyway. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) if (NAPI_GRO_CB(skb)->flush)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) goto skip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) inet_gro_compute_pseudo))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) goto flush;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) else if (uh->check)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) skb_gro_checksum_try_convert(skb, IPPROTO_UDP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) inet_gro_compute_pseudo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) skip:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) NAPI_GRO_CB(skb)->is_ipv6 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) if (static_branch_unlikely(&udp_encap_needed_key))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) sk = udp4_gro_lookup_skb(skb, uh->source, uh->dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) pp = udp_gro_receive(head, skb, uh, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) return pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) flush:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) NAPI_GRO_CB(skb)->flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) static int udp_gro_complete_segment(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) struct udphdr *uh = udp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) skb->csum_start = (unsigned char *)uh - skb->head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) skb->csum_offset = offsetof(struct udphdr, check);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) skb->ip_summed = CHECKSUM_PARTIAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_L4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) if (skb->encapsulation)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) skb->inner_transport_header = skb->transport_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) int udp_gro_complete(struct sk_buff *skb, int nhoff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) udp_lookup_t lookup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) __be16 newlen = htons(skb->len - nhoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) int err = -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) uh->len = newlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) sk = INDIRECT_CALL_INET(lookup, udp6_lib_lookup_skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) udp4_lib_lookup_skb, skb, uh->source, uh->dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) if (sk && udp_sk(sk)->gro_complete) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) skb_shinfo(skb)->gso_type = uh->check ? SKB_GSO_UDP_TUNNEL_CSUM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) : SKB_GSO_UDP_TUNNEL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) /* Set encapsulation before calling into inner gro_complete()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) * functions to make them set up the inner offsets.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) skb->encapsulation = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) err = udp_sk(sk)->gro_complete(sk, skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) nhoff + sizeof(struct udphdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) err = udp_gro_complete_segment(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) if (skb->remcsum_offload)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) skb_shinfo(skb)->gso_type |= SKB_GSO_TUNNEL_REMCSUM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) EXPORT_SYMBOL(udp_gro_complete);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) INDIRECT_CALLABLE_SCOPE int udp4_gro_complete(struct sk_buff *skb, int nhoff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) const struct iphdr *iph = ip_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) if (NAPI_GRO_CB(skb)->is_flist) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) uh->len = htons(skb->len - nhoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) if (skb->csum_level < SKB_MAX_CSUM_LEVEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) skb->csum_level++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) skb->ip_summed = CHECKSUM_UNNECESSARY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) skb->csum_level = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) if (uh->check)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) iph->daddr, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) return udp_gro_complete(skb, nhoff, udp4_lib_lookup_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) static const struct net_offload udpv4_offload = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) .callbacks = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) .gso_segment = udp4_ufo_fragment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) .gro_receive = udp4_gro_receive,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) .gro_complete = udp4_gro_complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) int __init udpv4_offload_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) return inet_add_offload(&udpv4_offload, IPPROTO_UDP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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