--- a/include/net/netns/ipv6.h +++ b/include/net/netns/ipv6.h @@ -55,6 +55,7 @@ struct netns_ipv6 { unsigned long ip6_rt_last_gc; #ifdef CONFIG_IPV6_MULTIPLE_TABLES struct rt6_info *ip6_prohibit_entry; + struct rt6_info *ip6_failed_policy_entry; struct rt6_info *ip6_blk_hole_entry; struct fib6_table *fib6_local_tbl; struct fib_rules_ops *fib6_rules_ops; --- a/include/uapi/linux/fib_rules.h +++ b/include/uapi/linux/fib_rules.h @@ -64,6 +64,10 @@ enum { FR_ACT_BLACKHOLE, /* Drop without notification */ FR_ACT_UNREACHABLE, /* Drop with ENETUNREACH */ FR_ACT_PROHIBIT, /* Drop with EACCES */ + FR_ACT_RES9, + FR_ACT_RES10, + FR_ACT_RES11, + FR_ACT_FAILED_POLICY, /* Drop with EPERM */ __FR_ACT_MAX, }; --- a/include/uapi/linux/rtnetlink.h +++ b/include/uapi/linux/rtnetlink.h @@ -203,6 +203,7 @@ enum { RTN_THROW, /* Not in this table */ RTN_NAT, /* Translate this address */ RTN_XRESOLVE, /* Use external resolver */ + RTN_FAILED_POLICY, /* Failed ingress/egress policy */ __RTN_MAX }; --- a/net/ipv4/fib_rules.c +++ b/net/ipv4/fib_rules.c @@ -84,6 +84,10 @@ static int fib4_rule_action(struct fib_r err = -EACCES; goto errout; + case FR_ACT_FAILED_POLICY: + err = -EPERM; + goto errout; + case FR_ACT_BLACKHOLE: default: err = -EINVAL; --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -138,6 +138,10 @@ const struct fib_prop fib_props[RTN_MAX .error = -EINVAL, .scope = RT_SCOPE_NOWHERE, }, + [RTN_FAILED_POLICY] = { + .error = -EPERM, + .scope = RT_SCOPE_UNIVERSE, + }, }; static void rt_fibinfo_free(struct rtable __rcu **rtp) --- a/net/ipv4/fib_trie.c +++ b/net/ipv4/fib_trie.c @@ -2331,6 +2331,7 @@ static const char *const rtn_type_names[ [RTN_THROW] = "THROW", [RTN_NAT] = "NAT", [RTN_XRESOLVE] = "XRESOLVE", + [RTN_FAILED_POLICY] = "FAILED_POLICY", }; static inline const char *rtn_type(char *buf, size_t len, unsigned int t) --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -184,6 +184,7 @@ static int ipmr_rule_action(struct fib_r case FR_ACT_UNREACHABLE: return -ENETUNREACH; case FR_ACT_PROHIBIT: + case FR_ACT_FAILED_POLICY: return -EACCES; case FR_ACT_BLACKHOLE: default: --- a/net/ipv6/fib6_rules.c +++ b/net/ipv6/fib6_rules.c @@ -69,6 +69,9 @@ static int fib6_rule_action(struct fib_r case FR_ACT_PROHIBIT: rt = net->ipv6.ip6_prohibit_entry; goto discard_pkt; + case FR_ACT_FAILED_POLICY: + rt = net->ipv6.ip6_failed_policy_entry; + goto discard_pkt; } table = fib6_get_table(net, rule->table); --- a/net/ipv6/ip6mr.c +++ b/net/ipv6/ip6mr.c @@ -169,6 +169,8 @@ static int ip6mr_rule_action(struct fib_ return -ENETUNREACH; case FR_ACT_PROHIBIT: return -EACCES; + case FR_ACT_FAILED_POLICY: + return -EPERM; case FR_ACT_BLACKHOLE: default: return -EINVAL; --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -250,6 +250,24 @@ static const struct rt6_info ip6_prohibi .rt6i_ref = ATOMIC_INIT(1), }; +static int ip6_pkt_failed_policy(struct sk_buff *skb); +static int ip6_pkt_failed_policy_out(struct sk_buff *skb); + +static const struct rt6_info ip6_failed_policy_entry_template = { + .dst = { + .__refcnt = ATOMIC_INIT(1), + .__use = 1, + .obsolete = DST_OBSOLETE_FORCE_CHK, + .error = -EPERM, + .input = ip6_pkt_failed_policy, + .output = ip6_pkt_failed_policy_out, + }, + .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), + .rt6i_protocol = RTPROT_KERNEL, + .rt6i_metric = ~(u32) 0, + .rt6i_ref = ATOMIC_INIT(1), +}; + static const struct rt6_info ip6_blk_hole_entry_template = { .dst = { .__refcnt = ATOMIC_INIT(1), @@ -1510,6 +1528,11 @@ int ip6_route_add(struct fib6_config *cf rt->dst.output = ip6_pkt_prohibit_out; rt->dst.input = ip6_pkt_prohibit; break; + case RTN_FAILED_POLICY: + rt->dst.error = -EPERM; + rt->dst.output = ip6_pkt_failed_policy_out; + rt->dst.input = ip6_pkt_failed_policy; + break; case RTN_THROW: default: rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN @@ -2089,6 +2112,17 @@ static int ip6_pkt_prohibit_out(struct s return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); } +static int ip6_pkt_failed_policy(struct sk_buff *skb) +{ + return ip6_pkt_drop(skb, ICMPV6_POLICY_FAIL, IPSTATS_MIB_INNOROUTES); +} + +static int ip6_pkt_failed_policy_out(struct sk_buff *skb) +{ + skb->dev = skb_dst(skb)->dev; + return ip6_pkt_drop(skb, ICMPV6_POLICY_FAIL, IPSTATS_MIB_OUTNOROUTES); +} + /* * Allocate a dst for local (unicast / anycast) address. */ @@ -2291,7 +2325,8 @@ static int rtm_to_fib6_config(struct sk_ if (rtm->rtm_type == RTN_UNREACHABLE || rtm->rtm_type == RTN_BLACKHOLE || rtm->rtm_type == RTN_PROHIBIT || - rtm->rtm_type == RTN_THROW) + rtm->rtm_type == RTN_THROW || + rtm->rtm_type == RTN_FAILED_POLICY) cfg->fc_flags |= RTF_REJECT; if (rtm->rtm_type == RTN_LOCAL) @@ -2493,6 +2528,9 @@ static int rt6_fill_node(struct net *net case -EACCES: rtm->rtm_type = RTN_PROHIBIT; break; + case -EPERM: + rtm->rtm_type = RTN_FAILED_POLICY; + break; case -EAGAIN: rtm->rtm_type = RTN_THROW; break; @@ -2743,6 +2781,8 @@ static int ip6_route_dev_notify(struct n #ifdef CONFIG_IPV6_MULTIPLE_TABLES net->ipv6.ip6_prohibit_entry->dst.dev = dev; net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); + net->ipv6.ip6_failed_policy_entry->dst.dev = dev; + net->ipv6.ip6_failed_policy_entry->rt6i_idev = in6_dev_get(dev); net->ipv6.ip6_blk_hole_entry->dst.dev = dev; net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); #endif @@ -3003,6 +3043,17 @@ static int __net_init ip6_route_net_init net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, ip6_template_metrics, true); + + net->ipv6.ip6_failed_policy_entry = + kmemdup(&ip6_failed_policy_entry_template, + sizeof(*net->ipv6.ip6_failed_policy_entry), GFP_KERNEL); + if (!net->ipv6.ip6_failed_policy_entry) + goto out_ip6_blk_hole_entry; + net->ipv6.ip6_failed_policy_entry->dst.path = + (struct dst_entry *)net->ipv6.ip6_failed_policy_entry; + net->ipv6.ip6_failed_policy_entry->dst.ops = &net->ipv6.ip6_dst_ops; + dst_init_metrics(&net->ipv6.ip6_failed_policy_entry->dst, + ip6_template_metrics, true); #endif net->ipv6.sysctl.flush_delay = 0; @@ -3021,6 +3072,8 @@ out: return ret; #ifdef CONFIG_IPV6_MULTIPLE_TABLES +out_ip6_blk_hole_entry: + kfree(net->ipv6.ip6_blk_hole_entry); out_ip6_prohibit_entry: kfree(net->ipv6.ip6_prohibit_entry); out_ip6_null_entry: @@ -3038,6 +3091,7 @@ static void __net_exit ip6_route_net_exi #ifdef CONFIG_IPV6_MULTIPLE_TABLES kfree(net->ipv6.ip6_prohibit_entry); kfree(net->ipv6.ip6_blk_hole_entry); + kfree(net->ipv6.ip6_failed_policy_entry); #endif dst_entries_destroy(&net->ipv6.ip6_dst_ops); } @@ -3134,6 +3188,9 @@ int __init ip6_route_init(void) init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); + init_net.ipv6.ip6_failed_policy_entry->dst.dev = init_net.loopback_dev; + init_net.ipv6.ip6_failed_policy_entry->rt6i_idev = + in6_dev_get(init_net.loopback_dev); #endif ret = fib6_init(); if (ret)