From fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204 Mon Sep 17 00:00:00 2001 From: Timothy Pearson Date: Wed, 23 Aug 2017 14:45:25 -0500 Subject: Initial import of modified Linux 2.6.28 tree Original upstream URL: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y --- net/ipv4/xfrm4_input.c | 168 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 168 insertions(+) create mode 100644 net/ipv4/xfrm4_input.c (limited to 'net/ipv4/xfrm4_input.c') diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c new file mode 100644 index 0000000..390dcb1 --- /dev/null +++ b/net/ipv4/xfrm4_input.c @@ -0,0 +1,168 @@ +/* + * xfrm4_input.c + * + * Changes: + * YOSHIFUJI Hideaki @USAGI + * Split up af-specific portion + * Derek Atkins + * Add Encapsulation support + * + */ + +#include +#include +#include +#include +#include +#include + +int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb) +{ + return xfrm4_extract_header(skb); +} + +static inline int xfrm4_rcv_encap_finish(struct sk_buff *skb) +{ + if (skb->dst == NULL) { + const struct iphdr *iph = ip_hdr(skb); + + if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, + skb->dev)) + goto drop; + } + return dst_input(skb); +drop: + kfree_skb(skb); + return NET_RX_DROP; +} + +int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, + int encap_type) +{ + XFRM_SPI_SKB_CB(skb)->family = AF_INET; + XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); + return xfrm_input(skb, nexthdr, spi, encap_type); +} +EXPORT_SYMBOL(xfrm4_rcv_encap); + +int xfrm4_transport_finish(struct sk_buff *skb, int async) +{ + struct iphdr *iph = ip_hdr(skb); + + iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol; + +#ifndef CONFIG_NETFILTER + if (!async) + return -iph->protocol; +#endif + + __skb_push(skb, skb->data - skb_network_header(skb)); + iph->tot_len = htons(skb->len); + ip_send_check(iph); + + NF_HOOK(PF_INET, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, + xfrm4_rcv_encap_finish); + 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 xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) +{ + struct udp_sock *up = udp_sk(sk); + struct udphdr *uh; + struct iphdr *iph; + int iphlen, len; + int ret; + + __u8 *udpdata; + __be32 *udpdata32; + __u16 encap_type = 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_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) + goto drop; + + /* Now we can update and verify the packet length... */ + iph = ip_hdr(skb); + iphlen = iph->ihl << 2; + iph->tot_len = htons(ntohs(iph->tot_len) - len); + if (skb->len < iphlen + 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 */ + ret = xfrm4_rcv_encap(skb, IPPROTO_ESP, 0, encap_type); + return ret; + +drop: + kfree_skb(skb); + return 0; +} + +int xfrm4_rcv(struct sk_buff *skb) +{ + return xfrm4_rcv_spi(skb, ip_hdr(skb)->protocol, 0); +} + +EXPORT_SYMBOL(xfrm4_rcv); -- cgit v1.1