/* * Copyright (c) 2015 Nicira, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #include <linux/module.h>#include <linux/openvswitch.h>#include <linux/tcp.h>#include <linux/udp.h>#include <linux/sctp.h>#include <net/ip.h>#include <net/netfilter/nf_conntrack_core.h>#include <net/netfilter/nf_conntrack_helper.h>#include <net/netfilter/nf_conntrack_labels.h>#include <net/netfilter/nf_conntrack_seqadj.h>#include <net/netfilter/nf_conntrack_zones.h>#include <net/netfilter/ipv6/nf_defrag_ipv6.h> #ifdef CONFIG_NF_NAT_NEEDED#include <linux/netfilter/nf_nat.h>#include <net/netfilter/nf_nat_core.h>#include <net/netfilter/nf_nat_l3proto.h>#endif #include "datapath.h"#include "conntrack.h"#include "flow.h"#include "flow_netlink.h" struct ovs_ct_len_tbl { int maxlen; int minlen;}; /* Metadata mark for masked write to conntrack mark */struct md_mark { u32 value; u32 mask;}; /* Metadata label for masked write to conntrack label. */struct md_labels { struct ovs_key_ct_labels value; struct ovs_key_ct_labels mask;}; enum ovs_ct_nat { OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */ OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */ OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */}; /* Conntrack action context for execution. */struct ovs_conntrack_info { struct nf_conntrack_helper *helper; struct nf_conntrack_zone zone; struct nf_conn *ct; u8 commit : 1; u8 nat : 3; /* enum ovs_ct_nat */ u8 force : 1; u8 have_eventmask : 1; u16 family; u32 eventmask; /* Mask of 1 << IPCT_*. */ struct md_mark mark; struct md_labels labels;#ifdef CONFIG_NF_NAT_NEEDED struct nf_nat_range range; /* Only present for SRC NAT and DST NAT. */#endif}; static bool labels_nonzero(const struct ovs_key_ct_labels *labels); static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info); static u16 key_to_nfproto(const struct sw_flow_key *key){ switch (ntohs(key->eth.type)) { case ETH_P_IP: return NFPROTO_IPV4; case ETH_P_IPV6: return NFPROTO_IPV6; default: return NFPROTO_UNSPEC; }} /* Map SKB connection state into the values used by flow definition. */static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo){ u8 ct_state = OVS_CS_F_TRACKED; switch (ctinfo) { case IP_CT_ESTABLISHED_REPLY: case IP_CT_RELATED_REPLY: ct_state |= OVS_CS_F_REPLY_DIR; break; default: break; } switch (ctinfo) { case IP_CT_ESTABLISHED: case IP_CT_ESTABLISHED_REPLY: ct_state |= OVS_CS_F_ESTABLISHED; break; case IP_CT_RELATED: case IP_CT_RELATED_REPLY: ct_state |= OVS_CS_F_RELATED; break; case IP_CT_NEW: ct_state |= OVS_CS_F_NEW; break; default: break; } return ct_state;} static u32 ovs_ct_get_mark(const struct nf_conn *ct){#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) return ct ? ct->mark : 0;#else return 0;#endif} /* Guard against conntrack labels max size shrinking below 128 bits. */#if NF_CT_LABELS_MAX_SIZE < 16#error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes#endif static void ovs_ct_get_labels(const struct nf_conn *ct, struct ovs_key_ct_labels *labels){ struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL; if (cl) memcpy(labels, cl->bits, OVS_CT_LABELS_LEN); else memset(labels, 0, OVS_CT_LABELS_LEN);} static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key, const struct nf_conntrack_tuple *orig, u8 icmp_proto){ key->ct_orig_proto = orig->dst.protonum; if (orig->dst.protonum == icmp_proto) { key->ct.orig_tp.src = htons(orig->dst.u.icmp.type); key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code); } else { key->ct.orig_tp.src = orig->src.u.all; key->ct.orig_tp.dst = orig->dst.u.all; }} static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state, const struct nf_conntrack_zone *zone, const struct nf_conn *ct){ key->ct_state = state; key->ct_zone = zone->id; key->ct.mark = ovs_ct_get_mark(ct); ovs_ct_get_labels(ct, &key->ct.labels); if (ct) { const struct nf_conntrack_tuple *orig; /* Use the master if we have one. */ if (ct->master) ct = ct->master; orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; /* IP version must match with the master connection. */ if (key->eth.type == htons(ETH_P_IP) && nf_ct_l3num(ct) == NFPROTO_IPV4) { key->ipv4.ct_orig.src = orig->src.u3.ip; key->ipv4.ct_orig.dst = orig->dst.u3.ip; __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP); return; } else if (key->eth.type == htons(ETH_P_IPV6) && !sw_flow_key_is_nd(key) && nf_ct_l3num(ct) == NFPROTO_IPV6) { key->ipv6.ct_orig.src = orig->src.u3.in6; key->ipv6.ct_orig.dst = orig->dst.u3.in6; __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP); return; } } /* Clear 'ct_orig_proto' to mark the non-existence of conntrack * original direction key fields. */ key->ct_orig_proto = 0;} /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has * previously sent the packet to conntrack via the ct action. If * 'keep_nat_flags' is true, the existing NAT flags retained, else they are * initialized from the connection status. */static void ovs_ct_update_key(const struct sk_buff *skb, const struct ovs_conntrack_info *info, struct sw_flow_key *key, bool post_ct, bool keep_nat_flags){ const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt; enum ip_conntrack_info ctinfo; struct nf_conn *ct; u8 state = 0; ct = nf_ct_get(skb, &ctinfo); if (ct) { state = ovs_ct_get_state(ctinfo); /* All unconfirmed entries are NEW connections. */ if (!nf_ct_is_confirmed(ct)) state |= OVS_CS_F_NEW; /* OVS persists the related flag for the duration of the * connection. */ if (ct->master) state |= OVS_CS_F_RELATED; if (keep_nat_flags) { state |= key->ct_state & OVS_CS_F_NAT_MASK; } else { if (ct->status & IPS_SRC_NAT) state |= OVS_CS_F_SRC_NAT; if (ct->status & IPS_DST_NAT) state |= OVS_CS_F_DST_NAT; } zone = nf_ct_zone(ct); } else if (post_ct) { state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID; if (info) zone = &info->zone; } __ovs_ct_update_key(key, state, zone, ct);} /* This is called to initialize CT key fields possibly coming in from the local * stack. */void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key){ ovs_ct_update_key(skb, NULL, key, false, false);} #define IN6_ADDR_INITIALIZER(ADDR) \ { (ADDR).s6_addr32[0], (ADDR).s6_addr32[1], \ (ADDR).s6_addr32[2], (ADDR).s6_addr32[3] } int ovs_ct_put_key(const struct sw_flow_key *swkey, const struct sw_flow_key *output, struct sk_buff *skb){ if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state)) return -EMSGSIZE; if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone)) return -EMSGSIZE; if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark)) return -EMSGSIZE; if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels), &output->ct.labels)) return -EMSGSIZE; if (swkey->ct_orig_proto) { if (swkey->eth.type == htons(ETH_P_IP)) { struct ovs_key_ct_tuple_ipv4 orig = { output->ipv4.ct_orig.src, output->ipv4.ct_orig.dst, output->ct.orig_tp.src, output->ct.orig_tp.dst, output->ct_orig_proto, }; if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4, sizeof(orig), &orig)) return -EMSGSIZE; } else if (swkey->eth.type == htons(ETH_P_IPV6)) { struct ovs_key_ct_tuple_ipv6 orig = { IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.src), IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.dst), output->ct.orig_tp.src, output->ct.orig_tp.dst, output->ct_orig_proto, }; if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6, sizeof(orig), &orig)) return -EMSGSIZE; } } return 0;} static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key, u32 ct_mark, u32 mask){#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) u32 new_mark; new_mark = ct_mark | (ct->mark & ~(mask)); if (ct->mark != new_mark) { ct->mark = new_mark; if (nf_ct_is_confirmed(ct)) nf_conntrack_event_cache(IPCT_MARK, ct); key->ct.mark = new_mark; } return 0;#else return -ENOTSUPP;#endif} static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct){ struct nf_conn_labels *cl; cl = nf_ct_labels_find(ct); if (!cl) { nf_ct_labels_ext_add(ct); cl = nf_ct_labels_find(ct); } return cl;} /* Initialize labels for a new, yet to be committed conntrack entry. Note that * since the new connection is not yet confirmed, and thus no-one else has * access to it's labels, we simply write them over. */static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key, const struct ovs_key_ct_labels *labels, const struct ovs_key_ct_labels *mask){ struct nf_conn_labels *cl, *master_cl; bool have_mask = labels_nonzero(mask); /* Inherit master's labels to the related connection? */ master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL; if (!master_cl && !have_mask) return 0; /* Nothing to do. */ cl = ovs_ct_get_conn_labels(ct); if (!cl) return -ENOSPC; /* Inherit the master's labels, if any. */ if (master_cl) *cl = *master_cl; if (have_mask) { u32 *dst = (u32 *)cl->bits; int i; for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) dst[i] = (dst[i] & ~mask->ct_labels_32[i]) | (labels->ct_labels_32[i] & mask->ct_labels_32[i]); } /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the * IPCT_LABEL bit is set in the event cache. */ nf_conntrack_event_cache(IPCT_LABEL, ct); memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); return 0;} static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key, const struct ovs_key_ct_labels *labels, const struct ovs_key_ct_labels *mask){ struct nf_conn_labels *cl; int err; cl = ovs_ct_get_conn_labels(ct); if (!cl) return -ENOSPC; err = nf_connlabels_replace(ct, labels->ct_labels_32, mask->ct_labels_32, OVS_CT_LABELS_LEN_32); if (err) return err; memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); return 0;} /* 'skb' should already be pulled to nh_ofs. */static int ovs_ct_helper(struct sk_buff *skb, u16 proto){ const struct nf_conntrack_helper *helper; const struct nf_conn_help *help; enum ip_conntrack_info ctinfo; unsigned int protoff; struct nf_conn *ct; int err; ct = nf_ct_get(skb, &ctinfo); if (!ct || ctinfo == IP_CT_RELATED_REPLY) return NF_ACCEPT; help = nfct_help(ct); if (!help) return NF_ACCEPT; helper = rcu_dereference(help->helper); if (!helper) return NF_ACCEPT; switch (proto) { case NFPROTO_IPV4: protoff = ip_hdrlen(skb); break; case NFPROTO_IPV6: { u8 nexthdr = ipv6_hdr(skb)->nexthdr; __be16 frag_off; int ofs; ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, &frag_off); if (ofs < 0 || (frag_off & htons(~0x7)) != 0) { pr_debug("proto header not found\n"); return NF_ACCEPT; } protoff = ofs; break; } default: WARN_ONCE(1, "helper invoked on non-IP family!"); return NF_DROP; } err = helper->help(skb, protoff, ct, ctinfo); if (err != NF_ACCEPT) return err; /* Adjust seqs after helper. This is needed due to some helpers (e.g., * FTP with NAT) adusting the TCP payload size when mangling IP * addresses and/or port numbers in the text-based control connection. */ if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && !nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) return NF_DROP; return NF_ACCEPT;} /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero * value if 'skb' is freed. */static int handle_fragments(struct net *net, struct sw_flow_key *key, u16 zone, struct sk_buff *skb){ struct ovs_skb_cb ovs_cb = *OVS_CB(skb); int err; if (key->eth.type == htons(ETH_P_IP)) { enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone; memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); err = ip_defrag(net, skb, user); if (err) return err; ovs_cb.mru = IPCB(skb)->frag_max_size;#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) } else if (key->eth.type == htons(ETH_P_IPV6)) { enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone; memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); err = nf_ct_frag6_gather(net, skb, user); if (err) { if (err != -EINPROGRESS) kfree_skb(skb); return err; } key->ip.proto = ipv6_hdr(skb)->nexthdr; ovs_cb.mru = IP6CB(skb)->frag_max_size;#endifLines 1–500 of 1635. 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/* * Copyright (c) 2015 Nicira, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #include <linux/module.h> #include <linux/openvswitch.h> #include <linux/tcp.h> #include <linux/udp.h> #include <linux/sctp.h> #include <net/ip.h> #include <net/netfilter/nf_conntrack_core.h> #include <net/netfilter/nf_conntrack_helper.h> #include <net/netfilter/nf_conntrack_labels.h> #include <net/netfilter/nf_conntrack_seqadj.h> #include <net/netfilter/nf_conntrack_zones.h> #include <net/netfilter/ipv6/nf_defrag_ipv6.h> #ifdef CONFIG_NF_NAT_NEEDED #include <linux/netfilter/nf_nat.h> #include <net/netfilter/nf_nat_core.h> #include <net/netfilter/nf_nat_l3proto.h> #endif #include "datapath.h" #include "conntrack.h" #include "flow.h" #include "flow_netlink.h" struct ovs_ct_len_tbl { int maxlen; int minlen; }; /* Metadata mark for masked write to conntrack mark */ struct md_mark { u32 value; u32 mask; }; /* Metadata label for masked write to conntrack label. */ struct md_labels { struct ovs_key_ct_labels value; struct ovs_key_ct_labels mask; }; enum ovs_ct_nat { OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */ OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */ OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */ }; /* Conntrack action context for execution. */ struct ovs_conntrack_info { struct nf_conntrack_helper *helper; struct nf_conntrack_zone zone; struct nf_conn *ct; u8 commit : 1; u8 nat : 3; /* enum ovs_ct_nat */ u8 force : 1; u8 have_eventmask : 1; u16 family; u32 eventmask; /* Mask of 1 << IPCT_*. */ struct md_mark mark; struct md_labels labels; #ifdef CONFIG_NF_NAT_NEEDED struct nf_nat_range range; /* Only present for SRC NAT and DST NAT. */ #endif }; static bool labels_nonzero(const struct ovs_key_ct_labels *labels); static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info); static u16 key_to_nfproto(const struct sw_flow_key *key) { switch (ntohs(key->eth.type)) { case ETH_P_IP: return NFPROTO_IPV4; case ETH_P_IPV6: return NFPROTO_IPV6; default: return NFPROTO_UNSPEC; } } /* Map SKB connection state into the values used by flow definition. */ static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo) { u8 ct_state = OVS_CS_F_TRACKED; switch (ctinfo) { case IP_CT_ESTABLISHED_REPLY: case IP_CT_RELATED_REPLY: ct_state |= OVS_CS_F_REPLY_DIR; break; default: break; } switch (ctinfo) { case IP_CT_ESTABLISHED: case IP_CT_ESTABLISHED_REPLY: ct_state |= OVS_CS_F_ESTABLISHED; break; case IP_CT_RELATED: case IP_CT_RELATED_REPLY: ct_state |= OVS_CS_F_RELATED; break; case IP_CT_NEW: ct_state |= OVS_CS_F_NEW; break; default: break; } return ct_state; } static u32 ovs_ct_get_mark(const struct nf_conn *ct) { #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) return ct ? ct->mark : 0; #else return 0; #endif } /* Guard against conntrack labels max size shrinking below 128 bits. */ #if NF_CT_LABELS_MAX_SIZE < 16 #error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes #endif static void ovs_ct_get_labels(const struct nf_conn *ct, struct ovs_key_ct_labels *labels) { struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL; if (cl) memcpy(labels, cl->bits, OVS_CT_LABELS_LEN); else memset(labels, 0, OVS_CT_LABELS_LEN); } static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key, const struct nf_conntrack_tuple *orig, u8 icmp_proto) { key->ct_orig_proto = orig->dst.protonum; if (orig->dst.protonum == icmp_proto) { key->ct.orig_tp.src = htons(orig->dst.u.icmp.type); key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code); } else { key->ct.orig_tp.src = orig->src.u.all; key->ct.orig_tp.dst = orig->dst.u.all; } } static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state, const struct nf_conntrack_zone *zone, const struct nf_conn *ct) { key->ct_state = state; key->ct_zone = zone->id; key->ct.mark = ovs_ct_get_mark(ct); ovs_ct_get_labels(ct, &key->ct.labels); if (ct) { const struct nf_conntrack_tuple *orig; /* Use the master if we have one. */ if (ct->master) ct = ct->master; orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; /* IP version must match with the master connection. */ if (key->eth.type == htons(ETH_P_IP) && nf_ct_l3num(ct) == NFPROTO_IPV4) { key->ipv4.ct_orig.src = orig->src.u3.ip; key->ipv4.ct_orig.dst = orig->dst.u3.ip; __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP); return; } else if (key->eth.type == htons(ETH_P_IPV6) && !sw_flow_key_is_nd(key) && nf_ct_l3num(ct) == NFPROTO_IPV6) { key->ipv6.ct_orig.src = orig->src.u3.in6; key->ipv6.ct_orig.dst = orig->dst.u3.in6; __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP); return; } } /* Clear 'ct_orig_proto' to mark the non-existence of conntrack * original direction key fields. */ key->ct_orig_proto = 0; } /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has * previously sent the packet to conntrack via the ct action. If * 'keep_nat_flags' is true, the existing NAT flags retained, else they are * initialized from the connection status. */ static void ovs_ct_update_key(const struct sk_buff *skb, const struct ovs_conntrack_info *info, struct sw_flow_key *key, bool post_ct, bool keep_nat_flags) { const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt; enum ip_conntrack_info ctinfo; struct nf_conn *ct; u8 state = 0; ct = nf_ct_get(skb, &ctinfo); if (ct) { state = ovs_ct_get_state(ctinfo); /* All unconfirmed entries are NEW connections. */ if (!nf_ct_is_confirmed(ct)) state |= OVS_CS_F_NEW; /* OVS persists the related flag for the duration of the * connection. */ if (ct->master) state |= OVS_CS_F_RELATED; if (keep_nat_flags) { state |= key->ct_state & OVS_CS_F_NAT_MASK; } else { if (ct->status & IPS_SRC_NAT) state |= OVS_CS_F_SRC_NAT; if (ct->status & IPS_DST_NAT) state |= OVS_CS_F_DST_NAT; } zone = nf_ct_zone(ct); } else if (post_ct) { state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID; if (info) zone = &info->zone; } __ovs_ct_update_key(key, state, zone, ct); } /* This is called to initialize CT key fields possibly coming in from the local * stack. */ void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key) { ovs_ct_update_key(skb, NULL, key, false, false); } #define IN6_ADDR_INITIALIZER(ADDR) \ { (ADDR).s6_addr32[0], (ADDR).s6_addr32[1], \ (ADDR).s6_addr32[2], (ADDR).s6_addr32[3] } int ovs_ct_put_key(const struct sw_flow_key *swkey, const struct sw_flow_key *output, struct sk_buff *skb) { if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state)) return -EMSGSIZE; if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone)) return -EMSGSIZE; if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark)) return -EMSGSIZE; if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels), &output->ct.labels)) return -EMSGSIZE; if (swkey->ct_orig_proto) { if (swkey->eth.type == htons(ETH_P_IP)) { struct ovs_key_ct_tuple_ipv4 orig = { output->ipv4.ct_orig.src, output->ipv4.ct_orig.dst, output->ct.orig_tp.src, output->ct.orig_tp.dst, output->ct_orig_proto, }; if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4, sizeof(orig), &orig)) return -EMSGSIZE; } else if (swkey->eth.type == htons(ETH_P_IPV6)) { struct ovs_key_ct_tuple_ipv6 orig = { IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.src), IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.dst), output->ct.orig_tp.src, output->ct.orig_tp.dst, output->ct_orig_proto, }; if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6, sizeof(orig), &orig)) return -EMSGSIZE; } } return 0; } static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key, u32 ct_mark, u32 mask) { #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) u32 new_mark; new_mark = ct_mark | (ct->mark & ~(mask)); if (ct->mark != new_mark) { ct->mark = new_mark; if (nf_ct_is_confirmed(ct)) nf_conntrack_event_cache(IPCT_MARK, ct); key->ct.mark = new_mark; } return 0; #else return -ENOTSUPP; #endif } static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct) { struct nf_conn_labels *cl; cl = nf_ct_labels_find(ct); if (!cl) { nf_ct_labels_ext_add(ct); cl = nf_ct_labels_find(ct); } return cl; } /* Initialize labels for a new, yet to be committed conntrack entry. Note that * since the new connection is not yet confirmed, and thus no-one else has * access to it's labels, we simply write them over. */ static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key, const struct ovs_key_ct_labels *labels, const struct ovs_key_ct_labels *mask) { struct nf_conn_labels *cl, *master_cl; bool have_mask = labels_nonzero(mask); /* Inherit master's labels to the related connection? */ master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL; if (!master_cl && !have_mask) return 0; /* Nothing to do. */ cl = ovs_ct_get_conn_labels(ct); if (!cl) return -ENOSPC; /* Inherit the master's labels, if any. */ if (master_cl) *cl = *master_cl; if (have_mask) { u32 *dst = (u32 *)cl->bits; int i; for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) dst[i] = (dst[i] & ~mask->ct_labels_32[i]) | (labels->ct_labels_32[i] & mask->ct_labels_32[i]); } /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the * IPCT_LABEL bit is set in the event cache. */ nf_conntrack_event_cache(IPCT_LABEL, ct); memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); return 0; } static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key, const struct ovs_key_ct_labels *labels, const struct ovs_key_ct_labels *mask) { struct nf_conn_labels *cl; int err; cl = ovs_ct_get_conn_labels(ct); if (!cl) return -ENOSPC; err = nf_connlabels_replace(ct, labels->ct_labels_32, mask->ct_labels_32, OVS_CT_LABELS_LEN_32); if (err) return err; memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); return 0; } /* 'skb' should already be pulled to nh_ofs. */ static int ovs_ct_helper(struct sk_buff *skb, u16 proto) { const struct nf_conntrack_helper *helper; const struct nf_conn_help *help; enum ip_conntrack_info ctinfo; unsigned int protoff; struct nf_conn *ct; int err; ct = nf_ct_get(skb, &ctinfo); if (!ct || ctinfo == IP_CT_RELATED_REPLY) return NF_ACCEPT; help = nfct_help(ct); if (!help) return NF_ACCEPT; helper = rcu_dereference(help->helper); if (!helper) return NF_ACCEPT; switch (proto) { case NFPROTO_IPV4: protoff = ip_hdrlen(skb); break; case NFPROTO_IPV6: { u8 nexthdr = ipv6_hdr(skb)->nexthdr; __be16 frag_off; int ofs; ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, &frag_off); if (ofs < 0 || (frag_off & htons(~0x7)) != 0) { pr_debug("proto header not found\n"); return NF_ACCEPT; } protoff = ofs; break; } default: WARN_ONCE(1, "helper invoked on non-IP family!"); return NF_DROP; } err = helper->help(skb, protoff, ct, ctinfo); if (err != NF_ACCEPT) return err; /* Adjust seqs after helper. This is needed due to some helpers (e.g., * FTP with NAT) adusting the TCP payload size when mangling IP * addresses and/or port numbers in the text-based control connection. */ if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && !nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) return NF_DROP; return NF_ACCEPT; } /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero * value if 'skb' is freed. */ static int handle_fragments(struct net *net, struct sw_flow_key *key, u16 zone, struct sk_buff *skb) { struct ovs_skb_cb ovs_cb = *OVS_CB(skb); int err; if (key->eth.type == htons(ETH_P_IP)) { enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone; memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); err = ip_defrag(net, skb, user); if (err) return err; ovs_cb.mru = IPCB(skb)->frag_max_size; #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) } else if (key->eth.type == htons(ETH_P_IPV6)) { enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone; memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); err = nf_ct_frag6_gather(net, skb, user); if (err) { if (err != -EINPROGRESS) kfree_skb(skb); return err; } key->ip.proto = ipv6_hdr(skb)->nexthdr; ovs_cb.mru = IP6CB(skb)->frag_max_size; #endif