From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- net/ipv6/xfrm6_input.c | 258 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 258 insertions(+) create mode 100644 net/ipv6/xfrm6_input.c (limited to 'net/ipv6/xfrm6_input.c') diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c new file mode 100644 index 000000000..415638724 --- /dev/null +++ b/net/ipv6/xfrm6_input.c @@ -0,0 +1,258 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * xfrm6_input.c: based on net/ipv4/xfrm4_input.c + * + * Authors: + * Mitsuru KANDA @USAGI + * Kazunori MIYAZAWA @USAGI + * Kunihiro Ishiguro + * YOSHIFUJI Hideaki @USAGI + * IPv6 support + */ + +#include +#include +#include +#include +#include +#include + +int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, + struct ip6_tnl *t) +{ + XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t; + XFRM_SPI_SKB_CB(skb)->family = AF_INET6; + XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); + return xfrm_input(skb, nexthdr, spi, 0); +} +EXPORT_SYMBOL(xfrm6_rcv_spi); + +static int xfrm6_transport_finish2(struct net *net, struct sock *sk, + struct sk_buff *skb) +{ + if (xfrm_trans_queue(skb, ip6_rcv_finish)) { + kfree_skb(skb); + return NET_RX_DROP; + } + + return 0; +} + +int xfrm6_transport_finish(struct sk_buff *skb, int async) +{ + struct xfrm_offload *xo = xfrm_offload(skb); + int nhlen = skb->data - skb_network_header(skb); + + skb_network_header(skb)[IP6CB(skb)->nhoff] = + XFRM_MODE_SKB_CB(skb)->protocol; + +#ifndef CONFIG_NETFILTER + if (!async) + return 1; +#endif + + __skb_push(skb, nhlen); + ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); + skb_postpush_rcsum(skb, skb_network_header(skb), nhlen); + + if (xo && (xo->flags & XFRM_GRO)) { + skb_mac_header_rebuild(skb); + skb_reset_transport_header(skb); + return 0; + } + + NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, + dev_net(skb->dev), NULL, skb, skb->dev, NULL, + xfrm6_transport_finish2); + return 0; +} + +/* If it's a keepalive packet, then just eat it. + * If it's an encapsulated packet, then pass it to the + * IPsec xfrm input. + * Returns 0 if skb passed to xfrm or was dropped. + * Returns >0 if skb should be passed to UDP. + * Returns <0 if skb should be resubmitted (-ret is protocol) + */ +int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) +{ + struct udp_sock *up = udp_sk(sk); + struct udphdr *uh; + struct ipv6hdr *ip6h; + int len; + int ip6hlen = sizeof(struct ipv6hdr); + __u8 *udpdata; + __be32 *udpdata32; + u16 encap_type; + + if (skb->protocol == htons(ETH_P_IP)) + return xfrm4_udp_encap_rcv(sk, skb); + + encap_type = READ_ONCE(up->encap_type); + /* if this is not encapsulated socket, then just return now */ + if (!encap_type) + return 1; + + /* If this is a paged skb, make sure we pull up + * whatever data we need to look at. */ + len = skb->len - sizeof(struct udphdr); + if (!pskb_may_pull(skb, sizeof(struct udphdr) + min(len, 8))) + return 1; + + /* Now we can get the pointers */ + uh = udp_hdr(skb); + udpdata = (__u8 *)uh + sizeof(struct udphdr); + udpdata32 = (__be32 *)udpdata; + + switch (encap_type) { + default: + case UDP_ENCAP_ESPINUDP: + /* Check if this is a keepalive packet. If so, eat it. */ + if (len == 1 && udpdata[0] == 0xff) { + goto drop; + } else if (len > sizeof(struct ip_esp_hdr) && udpdata32[0] != 0) { + /* ESP Packet without Non-ESP header */ + len = sizeof(struct udphdr); + } else + /* Must be an IKE packet.. pass it through */ + return 1; + break; + case UDP_ENCAP_ESPINUDP_NON_IKE: + /* Check if this is a keepalive packet. If so, eat it. */ + if (len == 1 && udpdata[0] == 0xff) { + goto drop; + } else if (len > 2 * sizeof(u32) + sizeof(struct ip_esp_hdr) && + udpdata32[0] == 0 && udpdata32[1] == 0) { + + /* ESP Packet with Non-IKE marker */ + len = sizeof(struct udphdr) + 2 * sizeof(u32); + } else + /* Must be an IKE packet.. pass it through */ + return 1; + break; + } + + /* At this point we are sure that this is an ESPinUDP packet, + * so we need to remove 'len' bytes from the packet (the UDP + * header and optional ESP marker bytes) and then modify the + * protocol to ESP, and then call into the transform receiver. + */ + if (skb_unclone(skb, GFP_ATOMIC)) + goto drop; + + /* Now we can update and verify the packet length... */ + ip6h = ipv6_hdr(skb); + ip6h->payload_len = htons(ntohs(ip6h->payload_len) - len); + if (skb->len < ip6hlen + len) { + /* packet is too small!?! */ + goto drop; + } + + /* pull the data buffer up to the ESP header and set the + * transport header to point to ESP. Keep UDP on the stack + * for later. + */ + __skb_pull(skb, len); + skb_reset_transport_header(skb); + + /* process ESP */ + return xfrm6_rcv_encap(skb, IPPROTO_ESP, 0, encap_type); + +drop: + kfree_skb(skb); + return 0; +} + +int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t) +{ + return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff], + 0, t); +} +EXPORT_SYMBOL(xfrm6_rcv_tnl); + +int xfrm6_rcv(struct sk_buff *skb) +{ + return xfrm6_rcv_tnl(skb, NULL); +} +EXPORT_SYMBOL(xfrm6_rcv); +int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, + xfrm_address_t *saddr, u8 proto) +{ + struct net *net = dev_net(skb->dev); + struct xfrm_state *x = NULL; + struct sec_path *sp; + int i = 0; + + sp = secpath_set(skb); + if (!sp) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); + goto drop; + } + + if (1 + sp->len == XFRM_MAX_DEPTH) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); + goto drop; + } + + for (i = 0; i < 3; i++) { + xfrm_address_t *dst, *src; + + switch (i) { + case 0: + dst = daddr; + src = saddr; + break; + case 1: + /* lookup state with wild-card source address */ + dst = daddr; + src = (xfrm_address_t *)&in6addr_any; + break; + default: + /* lookup state with wild-card addresses */ + dst = (xfrm_address_t *)&in6addr_any; + src = (xfrm_address_t *)&in6addr_any; + break; + } + + x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6); + if (!x) + continue; + + spin_lock(&x->lock); + + if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) && + likely(x->km.state == XFRM_STATE_VALID) && + !xfrm_state_check_expire(x)) { + spin_unlock(&x->lock); + if (x->type->input(x, skb) > 0) { + /* found a valid state */ + break; + } + } else + spin_unlock(&x->lock); + + xfrm_state_put(x); + x = NULL; + } + + if (!x) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); + xfrm_audit_state_notfound_simple(skb, AF_INET6); + goto drop; + } + + sp->xvec[sp->len++] = x; + + spin_lock(&x->lock); + + x->curlft.bytes += skb->len; + x->curlft.packets++; + + spin_unlock(&x->lock); + + return 1; + +drop: + return -1; +} +EXPORT_SYMBOL(xfrm6_input_addr); -- cgit v1.2.3