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5146d1f151
IPCB may contain data from previous layers (in the observed case the
qdisc layer). In the observed scenario, the data was misinterpreted as
ip header options, which later caused the ihl to be set to an invalid
value (<5). This resulted in an infinite loop in the mips implementation
of ip_fast_csum.
This patch clears IPCB(skb)->opt before dst_link_failure can be called for
various types of tunnels. This change only applies to encapsulated ipv4
packets.
The code introduced in 11c21a30 which clears all of IPCB has been removed
to be consistent with these changes, and instead the opt field is cleared
unconditionally in ip_tunnel_xmit. The change in ip_tunnel_xmit applies to
SIT, GRE, and IPIP tunnels.
The relevant vti, l2tp, and pptp functions already contain similar code for
clearing the IPCB.
Signed-off-by: Bernie Harris <bernie.harris@alliedtelesis.co.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>
131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/socket.h>
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#include <linux/udp.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <net/dst_metadata.h>
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#include <net/net_namespace.h>
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#include <net/udp.h>
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#include <net/udp_tunnel.h>
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int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
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struct socket **sockp)
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{
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int err;
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struct socket *sock = NULL;
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struct sockaddr_in udp_addr;
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err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
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if (err < 0)
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goto error;
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udp_addr.sin_family = AF_INET;
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udp_addr.sin_addr = cfg->local_ip;
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udp_addr.sin_port = cfg->local_udp_port;
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err = kernel_bind(sock, (struct sockaddr *)&udp_addr,
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sizeof(udp_addr));
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if (err < 0)
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goto error;
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if (cfg->peer_udp_port) {
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udp_addr.sin_family = AF_INET;
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udp_addr.sin_addr = cfg->peer_ip;
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udp_addr.sin_port = cfg->peer_udp_port;
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err = kernel_connect(sock, (struct sockaddr *)&udp_addr,
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sizeof(udp_addr), 0);
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if (err < 0)
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goto error;
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}
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sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
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*sockp = sock;
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return 0;
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error:
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if (sock) {
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kernel_sock_shutdown(sock, SHUT_RDWR);
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sock_release(sock);
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}
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*sockp = NULL;
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return err;
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}
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EXPORT_SYMBOL(udp_sock_create4);
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void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
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struct udp_tunnel_sock_cfg *cfg)
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{
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struct sock *sk = sock->sk;
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/* Disable multicast loopback */
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inet_sk(sk)->mc_loop = 0;
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/* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
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inet_inc_convert_csum(sk);
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rcu_assign_sk_user_data(sk, cfg->sk_user_data);
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udp_sk(sk)->encap_type = cfg->encap_type;
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udp_sk(sk)->encap_rcv = cfg->encap_rcv;
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udp_sk(sk)->encap_destroy = cfg->encap_destroy;
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udp_tunnel_encap_enable(sock);
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}
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EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
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void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
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__be32 src, __be32 dst, __u8 tos, __u8 ttl,
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__be16 df, __be16 src_port, __be16 dst_port,
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bool xnet, bool nocheck)
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{
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struct udphdr *uh;
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__skb_push(skb, sizeof(*uh));
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skb_reset_transport_header(skb);
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uh = udp_hdr(skb);
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uh->dest = dst_port;
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uh->source = src_port;
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uh->len = htons(skb->len);
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memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
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udp_set_csum(nocheck, skb, src, dst, skb->len);
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iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, xnet);
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}
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EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
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void udp_tunnel_sock_release(struct socket *sock)
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{
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rcu_assign_sk_user_data(sock->sk, NULL);
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kernel_sock_shutdown(sock, SHUT_RDWR);
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sock_release(sock);
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}
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EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
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struct metadata_dst *udp_tun_rx_dst(struct sk_buff *skb, unsigned short family,
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__be16 flags, __be64 tunnel_id, int md_size)
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{
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struct metadata_dst *tun_dst;
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struct ip_tunnel_info *info;
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if (family == AF_INET)
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tun_dst = ip_tun_rx_dst(skb, flags, tunnel_id, md_size);
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else
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tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id, md_size);
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if (!tun_dst)
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return NULL;
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info = &tun_dst->u.tun_info;
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info->key.tp_src = udp_hdr(skb)->source;
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info->key.tp_dst = udp_hdr(skb)->dest;
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if (udp_hdr(skb)->check)
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info->key.tun_flags |= TUNNEL_CSUM;
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return tun_dst;
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}
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EXPORT_SYMBOL_GPL(udp_tun_rx_dst);
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MODULE_LICENSE("GPL");
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