29a26a5680
Pass a network namespace parameter into the netfilter hooks. At the call site of the netfilter hooks the path a packet is taking through the network stack is well known which allows the network namespace to be easily and reliabily. This allows the replacement of magic code like "dev_net(state->in?:state->out)" that appears at the start of most netfilter hooks with "state->net". In almost all cases the network namespace passed in is derived from the first network device passed in, guaranteeing those paths will not see any changes in practice. The exceptions are: xfrm/xfrm_output.c:xfrm_output_resume() xs_net(skb_dst(skb)->xfrm) ipvs/ip_vs_xmit.c:ip_vs_nat_send_or_cont() ip_vs_conn_net(cp) ipvs/ip_vs_xmit.c:ip_vs_send_or_cont() ip_vs_conn_net(cp) ipv4/raw.c:raw_send_hdrinc() sock_net(sk) ipv6/ip6_output.c:ip6_xmit() sock_net(sk) ipv6/ndisc.c:ndisc_send_skb() dev_net(skb->dev) not dev_net(dst->dev) ipv6/raw.c:raw6_send_hdrinc() sock_net(sk) br_netfilter_hooks.c:br_nf_pre_routing_finish() dev_net(skb->dev) before skb->dev is set to nf_bridge->physindev In all cases these exceptions seem to be a better expression for the network namespace the packet is being processed in then the historic "dev_net(in?in:out)". I am documenting them in case something odd pops up and someone starts trying to track down what happened. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
146 lines
3 KiB
C
146 lines
3 KiB
C
/*
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* xfrm6_input.c: based on net/ipv4/xfrm4_input.c
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*
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* Authors:
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* Mitsuru KANDA @USAGI
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* Kazunori MIYAZAWA @USAGI
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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* YOSHIFUJI Hideaki @USAGI
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* IPv6 support
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv6.h>
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#include <net/ipv6.h>
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#include <net/xfrm.h>
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int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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return xfrm6_extract_header(skb);
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}
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int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
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{
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XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
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XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
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return xfrm_input(skb, nexthdr, spi, 0);
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}
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EXPORT_SYMBOL(xfrm6_rcv_spi);
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int xfrm6_transport_finish(struct sk_buff *skb, int async)
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{
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skb_network_header(skb)[IP6CB(skb)->nhoff] =
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XFRM_MODE_SKB_CB(skb)->protocol;
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#ifndef CONFIG_NETFILTER
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if (!async)
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return 1;
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#endif
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ipv6_hdr(skb)->payload_len = htons(skb->len);
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__skb_push(skb, skb->data - skb_network_header(skb));
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NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
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dev_net(skb->dev), NULL, skb, skb->dev, NULL,
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ip6_rcv_finish);
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return -1;
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}
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int xfrm6_rcv(struct sk_buff *skb)
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{
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return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
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0);
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}
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EXPORT_SYMBOL(xfrm6_rcv);
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int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
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xfrm_address_t *saddr, u8 proto)
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{
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struct net *net = dev_net(skb->dev);
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struct xfrm_state *x = NULL;
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int i = 0;
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/* Allocate new secpath or COW existing one. */
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if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
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struct sec_path *sp;
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sp = secpath_dup(skb->sp);
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if (!sp) {
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
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goto drop;
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}
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if (skb->sp)
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secpath_put(skb->sp);
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skb->sp = sp;
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}
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if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
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goto drop;
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}
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for (i = 0; i < 3; i++) {
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xfrm_address_t *dst, *src;
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switch (i) {
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case 0:
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dst = daddr;
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src = saddr;
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break;
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case 1:
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/* lookup state with wild-card source address */
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dst = daddr;
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src = (xfrm_address_t *)&in6addr_any;
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break;
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default:
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/* lookup state with wild-card addresses */
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dst = (xfrm_address_t *)&in6addr_any;
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src = (xfrm_address_t *)&in6addr_any;
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break;
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}
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x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6);
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if (!x)
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continue;
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spin_lock(&x->lock);
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if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&
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likely(x->km.state == XFRM_STATE_VALID) &&
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!xfrm_state_check_expire(x)) {
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spin_unlock(&x->lock);
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if (x->type->input(x, skb) > 0) {
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/* found a valid state */
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break;
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}
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} else
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spin_unlock(&x->lock);
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xfrm_state_put(x);
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x = NULL;
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}
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if (!x) {
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
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xfrm_audit_state_notfound_simple(skb, AF_INET6);
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goto drop;
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}
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skb->sp->xvec[skb->sp->len++] = x;
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spin_lock(&x->lock);
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x->curlft.bytes += skb->len;
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x->curlft.packets++;
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spin_unlock(&x->lock);
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return 1;
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drop:
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return -1;
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}
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EXPORT_SYMBOL(xfrm6_input_addr);
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