diff --git a/net/netfilter/xt_TPROXY.c b/net/netfilter/xt_TPROXY.c index d5f97e2302b8..19c482caf30b 100644 --- a/net/netfilter/xt_TPROXY.c +++ b/net/netfilter/xt_TPROXY.c @@ -16,15 +16,41 @@ #include #include #include - +#include #include #include -#include -#include #include +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) +#include +#include +#include #include +#endif + #include +#include + +static inline __be32 +tproxy_laddr4(struct sk_buff *skb, __be32 user_laddr, __be32 daddr) +{ + struct in_device *indev; + __be32 laddr; + + if (user_laddr) + return user_laddr; + + laddr = 0; + rcu_read_lock(); + indev = __in_dev_get_rcu(skb->dev); + for_primary_ifa(indev) { + laddr = ifa->ifa_local; + break; + } endfor_ifa(indev); + rcu_read_unlock(); + + return laddr ? laddr : daddr; +} /** * tproxy_handle_time_wait4() - handle IPv4 TCP TIME_WAIT reopen redirections @@ -75,6 +101,106 @@ tproxy_handle_time_wait4(struct sk_buff *skb, __be32 laddr, __be16 lport, return sk; } +static unsigned int +tproxy_tg4(struct sk_buff *skb, __be32 laddr, __be16 lport, + u_int32_t mark_mask, u_int32_t mark_value) +{ + const struct iphdr *iph = ip_hdr(skb); + struct udphdr _hdr, *hp; + struct sock *sk; + + hp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_hdr), &_hdr); + if (hp == NULL) + return NF_DROP; + + /* check if there's an ongoing connection on the packet + * addresses, this happens if the redirect already happened + * and the current packet belongs to an already established + * connection */ + sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), iph->protocol, + iph->saddr, iph->daddr, + hp->source, hp->dest, + skb->dev, NFT_LOOKUP_ESTABLISHED); + + laddr = tproxy_laddr4(skb, laddr, iph->daddr); + if (!lport) + lport = hp->dest; + + /* UDP has no TCP_TIME_WAIT state, so we never enter here */ + if (sk && sk->sk_state == TCP_TIME_WAIT) + /* reopening a TIME_WAIT connection needs special handling */ + sk = tproxy_handle_time_wait4(skb, laddr, lport, sk); + else if (!sk) + /* no, there's no established connection, check if + * there's a listener on the redirected addr/port */ + sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), iph->protocol, + iph->saddr, laddr, + hp->source, lport, + skb->dev, NFT_LOOKUP_LISTENER); + + /* NOTE: assign_sock consumes our sk reference */ + if (sk && nf_tproxy_assign_sock(skb, sk)) { + /* This should be in a separate target, but we don't do multiple + targets on the same rule yet */ + skb->mark = (skb->mark & ~mark_mask) ^ mark_value; + + pr_debug("redirecting: proto %hhu %pI4:%hu -> %pI4:%hu, mark: %x\n", + iph->protocol, &iph->daddr, ntohs(hp->dest), + &laddr, ntohs(lport), skb->mark); + return NF_ACCEPT; + } + + pr_debug("no socket, dropping: proto %hhu %pI4:%hu -> %pI4:%hu, mark: %x\n", + iph->protocol, &iph->saddr, ntohs(hp->source), + &iph->daddr, ntohs(hp->dest), skb->mark); + return NF_DROP; +} + +static unsigned int +tproxy_tg4_v0(struct sk_buff *skb, const struct xt_action_param *par) +{ + const struct xt_tproxy_target_info *tgi = par->targinfo; + + return tproxy_tg4(skb, tgi->laddr, tgi->lport, tgi->mark_mask, tgi->mark_value); +} + +static unsigned int +tproxy_tg4_v1(struct sk_buff *skb, const struct xt_action_param *par) +{ + const struct xt_tproxy_target_info_v1 *tgi = par->targinfo; + + return tproxy_tg4(skb, tgi->laddr.ip, tgi->lport, tgi->mark_mask, tgi->mark_value); +} + +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + +static inline const struct in6_addr * +tproxy_laddr6(struct sk_buff *skb, const struct in6_addr *user_laddr, + const struct in6_addr *daddr) +{ + struct inet6_dev *indev; + struct inet6_ifaddr *ifa; + struct in6_addr *laddr; + + if (!ipv6_addr_any(user_laddr)) + return user_laddr; + laddr = NULL; + + rcu_read_lock(); + indev = __in6_dev_get(skb->dev); + if (indev) + list_for_each_entry(ifa, &indev->addr_list, if_list) { + if (ifa->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED)) + continue; + + laddr = &ifa->addr; + break; + } + rcu_read_unlock(); + + return laddr ? laddr : daddr; +} + /** * tproxy_handle_time_wait6() - handle IPv6 TCP TIME_WAIT reopen redirections * @skb: The skb being processed. @@ -115,7 +241,7 @@ tproxy_handle_time_wait6(struct sk_buff *skb, int tproto, int thoff, sk2 = nf_tproxy_get_sock_v6(dev_net(skb->dev), tproto, &iph->saddr, - !ipv6_addr_any(&tgi->laddr.in6) ? &tgi->laddr.in6 : &iph->daddr, + tproxy_laddr6(skb, &tgi->laddr.in6, &iph->daddr), hp->source, tgi->lport ? tgi->lport : hp->dest, skb->dev, NFT_LOOKUP_LISTENER); @@ -129,74 +255,6 @@ tproxy_handle_time_wait6(struct sk_buff *skb, int tproto, int thoff, return sk; } -static unsigned int -tproxy_tg4(struct sk_buff *skb, __be32 laddr, __be16 lport, - u_int32_t mark_mask, u_int32_t mark_value) -{ - const struct iphdr *iph = ip_hdr(skb); - struct udphdr _hdr, *hp; - struct sock *sk; - - hp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_hdr), &_hdr); - if (hp == NULL) - return NF_DROP; - - /* check if there's an ongoing connection on the packet - * addresses, this happens if the redirect already happened - * and the current packet belongs to an already established - * connection */ - sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), iph->protocol, - iph->saddr, iph->daddr, - hp->source, hp->dest, - skb->dev, NFT_LOOKUP_ESTABLISHED); - - /* UDP has no TCP_TIME_WAIT state, so we never enter here */ - if (sk && sk->sk_state == TCP_TIME_WAIT) - /* reopening a TIME_WAIT connection needs special handling */ - sk = tproxy_handle_time_wait4(skb, laddr, lport, sk); - else if (!sk) - /* no, there's no established connection, check if - * there's a listener on the redirected addr/port */ - sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), iph->protocol, - iph->saddr, laddr ? laddr : iph->daddr, - hp->source, lport ? lport : hp->dest, - skb->dev, NFT_LOOKUP_LISTENER); - - /* NOTE: assign_sock consumes our sk reference */ - if (sk && nf_tproxy_assign_sock(skb, sk)) { - /* This should be in a separate target, but we don't do multiple - targets on the same rule yet */ - skb->mark = (skb->mark & ~mark_mask) ^ mark_value; - - pr_debug("redirecting: proto %hhu %pI4:%hu -> %pI4:%hu, mark: %x\n", - iph->protocol, &iph->daddr, ntohs(hp->dest), - &laddr, ntohs(lport), skb->mark); - return NF_ACCEPT; - } - - pr_debug("no socket, dropping: proto %hhu %08x:%hu -> %08x:%hu, mark: %x\n", - iph->protocol, ntohl(iph->daddr), ntohs(hp->dest), - ntohl(laddr), ntohs(lport), skb->mark); - return NF_DROP; -} - -static unsigned int -tproxy_tg4_v0(struct sk_buff *skb, const struct xt_action_param *par) -{ - const struct xt_tproxy_target_info *tgi = par->targinfo; - - return tproxy_tg4(skb, tgi->laddr, tgi->lport, tgi->mark_mask, tgi->mark_value); -} - -static unsigned int -tproxy_tg4_v1(struct sk_buff *skb, const struct xt_action_param *par) -{ - const struct xt_tproxy_target_info_v1 *tgi = par->targinfo; - - return tproxy_tg4(skb, tgi->laddr.ip, tgi->lport, tgi->mark_mask, tgi->mark_value); -} - -#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) static unsigned int tproxy_tg6_v1(struct sk_buff *skb, const struct xt_action_param *par) { @@ -204,6 +262,8 @@ tproxy_tg6_v1(struct sk_buff *skb, const struct xt_action_param *par) const struct xt_tproxy_target_info_v1 *tgi = par->targinfo; struct udphdr _hdr, *hp; struct sock *sk; + const struct in6_addr *laddr; + __be16 lport; int thoff; int tproto; @@ -228,6 +288,9 @@ tproxy_tg6_v1(struct sk_buff *skb, const struct xt_action_param *par) hp->source, hp->dest, par->in, NFT_LOOKUP_ESTABLISHED); + laddr = tproxy_laddr6(skb, &tgi->laddr.in6, &iph->daddr); + lport = tgi->lport ? tgi->lport : hp->dest; + /* UDP has no TCP_TIME_WAIT state, so we never enter here */ if (sk && sk->sk_state == TCP_TIME_WAIT) /* reopening a TIME_WAIT connection needs special handling */ @@ -236,10 +299,8 @@ tproxy_tg6_v1(struct sk_buff *skb, const struct xt_action_param *par) /* no there's no established connection, check if * there's a listener on the redirected addr/port */ sk = nf_tproxy_get_sock_v6(dev_net(skb->dev), tproto, - &iph->saddr, - !ipv6_addr_any(&tgi->laddr.in6) ? &tgi->laddr.in6 : &iph->daddr, - hp->source, - tgi->lport ? tgi->lport : hp->dest, + &iph->saddr, laddr, + hp->source, lport, par->in, NFT_LOOKUP_LISTENER); /* NOTE: assign_sock consumes our sk reference */ @@ -249,14 +310,15 @@ tproxy_tg6_v1(struct sk_buff *skb, const struct xt_action_param *par) skb->mark = (skb->mark & ~tgi->mark_mask) ^ tgi->mark_value; pr_debug("redirecting: proto %hhu %pI6:%hu -> %pI6:%hu, mark: %x\n", - tproto, &iph->saddr, ntohs(hp->dest), - &tgi->laddr.in6, ntohs(tgi->lport), skb->mark); + tproto, &iph->saddr, ntohs(hp->source), + laddr, ntohs(lport), skb->mark); return NF_ACCEPT; } pr_debug("no socket, dropping: proto %hhu %pI6:%hu -> %pI6:%hu, mark: %x\n", - tproto, &iph->saddr, ntohs(hp->dest), - &tgi->laddr.in6, ntohs(tgi->lport), skb->mark); + tproto, &iph->saddr, ntohs(hp->source), + &iph->daddr, ntohs(hp->dest), skb->mark); + return NF_DROP; }