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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303/* SPDX-License-Identifier: GPL-2.0 */#include <linux/module.h>#include <linux/netfilter/nf_tables.h>#include <net/netfilter/nf_tables.h>#include <net/netfilter/nf_tables_core.h>#include <net/netfilter/nf_socket.h>#include <net/inet_sock.h>#include <net/tcp.h>
struct nft_socket { enum nft_socket_keys key:8; u8 level; /* cgroupv2 level to extract */ u8 level_user; /* cgroupv2 level provided by userspace */ u8 len; union { u8 dreg; };};
static void nft_socket_wildcard(const struct nft_pktinfo *pkt, struct nft_regs *regs, struct sock *sk, u32 *dest){ switch (nft_pf(pkt)) { case NFPROTO_IPV4: nft_reg_store8(dest, inet_sk(sk)->inet_rcv_saddr == 0); break;#if IS_ENABLED(CONFIG_NF_TABLES_IPV6) case NFPROTO_IPV6: nft_reg_store8(dest, ipv6_addr_any(&sk->sk_v6_rcv_saddr)); break;#endif default: regs->verdict.code = NFT_BREAK; return; }}
#ifdef CONFIG_SOCK_CGROUP_DATAstatic noinline boolnft_sock_get_eval_cgroupv2(u32 *dest, struct sock *sk, const struct nft_pktinfo *pkt, u32 level){ struct cgroup *cgrp; u64 cgid;
if (!sk_fullsock(sk)) return false;
cgrp = cgroup_ancestor(sock_cgroup_ptr(&sk->sk_cgrp_data), level); if (!cgrp) return false;
cgid = cgroup_id(cgrp); memcpy(dest, &cgid, sizeof(u64)); return true;}
/* process context only, uses current->nsproxy. */static noinline int nft_socket_cgroup_subtree_level(void){ struct cgroup *cgrp = cgroup_get_from_path("/"); int level;
if (IS_ERR(cgrp)) return PTR_ERR(cgrp);
level = cgrp->level;
cgroup_put(cgrp);
if (level > 255) return -ERANGE;
if (unlikely(level < 0)) { DEBUG_NET_WARN_ON_ONCE(1); return -EINVAL; }
return level;}#endif
static struct sock *nft_socket_do_lookup(const struct nft_pktinfo *pkt){ const struct net_device *indev = nft_in(pkt); const struct sk_buff *skb = pkt->skb; struct sock *sk = NULL;
if (!indev) return NULL;
switch (nft_pf(pkt)) { case NFPROTO_IPV4: sk = nf_sk_lookup_slow_v4(nft_net(pkt), skb, indev); break;#if IS_ENABLED(CONFIG_NF_TABLES_IPV6) case NFPROTO_IPV6: sk = nf_sk_lookup_slow_v6(nft_net(pkt), skb, indev); break;#endif default: DEBUG_NET_WARN_ON_ONCE(1); break; }
return sk;}
static void nft_socket_eval(const struct nft_expr *expr, struct nft_regs *regs, const struct nft_pktinfo *pkt){ const struct nft_socket *priv = nft_expr_priv(expr); struct sk_buff *skb = pkt->skb; struct sock *sk = skb->sk; u32 *dest = ®s->data[priv->dreg];
if (sk && !net_eq(nft_net(pkt), sock_net(sk))) sk = NULL;
if (!sk) sk = nft_socket_do_lookup(pkt);
if (!sk) { regs->verdict.code = NFT_BREAK; return; }
switch(priv->key) { case NFT_SOCKET_TRANSPARENT: nft_reg_store8(dest, inet_sk_transparent(sk)); break; case NFT_SOCKET_MARK: if (sk_fullsock(sk)) { *dest = READ_ONCE(sk->sk_mark); } else { regs->verdict.code = NFT_BREAK; goto out_put_sk; } break; case NFT_SOCKET_WILDCARD: if (!sk_fullsock(sk)) { regs->verdict.code = NFT_BREAK; goto out_put_sk; } nft_socket_wildcard(pkt, regs, sk, dest); break;#ifdef CONFIG_SOCK_CGROUP_DATA case NFT_SOCKET_CGROUPV2: if (!nft_sock_get_eval_cgroupv2(dest, sk, pkt, priv->level)) { regs->verdict.code = NFT_BREAK; goto out_put_sk; } break;#endif default: DEBUG_NET_WARN_ON_ONCE(1); regs->verdict.code = NFT_BREAK; }
out_put_sk: if (sk != skb->sk) sock_gen_put(sk);}
static const struct nla_policy nft_socket_policy[NFTA_SOCKET_MAX + 1] = { [NFTA_SOCKET_KEY] = NLA_POLICY_MAX(NLA_BE32, 255), [NFTA_SOCKET_DREG] = NLA_POLICY_MAX(NLA_BE32, NFT_REG32_MAX), [NFTA_SOCKET_LEVEL] = NLA_POLICY_MAX(NLA_BE32, 255),};
static int nft_socket_init(const struct nft_ctx *ctx, const struct nft_expr *expr, const struct nlattr * const tb[]){ struct nft_socket *priv = nft_expr_priv(expr); unsigned int len;
if (!tb[NFTA_SOCKET_DREG] || !tb[NFTA_SOCKET_KEY]) return -EINVAL;
switch(ctx->family) { case NFPROTO_IPV4:#if IS_ENABLED(CONFIG_NF_TABLES_IPV6) case NFPROTO_IPV6:#endif case NFPROTO_INET: break; default: return -EOPNOTSUPP; }
priv->key = ntohl(nla_get_be32(tb[NFTA_SOCKET_KEY])); switch(priv->key) { case NFT_SOCKET_TRANSPARENT: case NFT_SOCKET_WILDCARD: len = sizeof(u8); break; case NFT_SOCKET_MARK: len = sizeof(u32); break;#ifdef CONFIG_SOCK_CGROUP_DATA case NFT_SOCKET_CGROUPV2: { unsigned int level; int err;
if (!tb[NFTA_SOCKET_LEVEL]) return -EINVAL;
level = ntohl(nla_get_be32(tb[NFTA_SOCKET_LEVEL])); if (level > 255) return -EOPNOTSUPP;
err = nft_socket_cgroup_subtree_level(); if (err < 0) return err;
priv->level_user = level;
level += err; /* Implies a giant cgroup tree */ if (level > 255) return -EOPNOTSUPP;
priv->level = level; len = sizeof(u64); break; }#endif default: return -EOPNOTSUPP; }
priv->len = len; return nft_parse_register_store(ctx, tb[NFTA_SOCKET_DREG], &priv->dreg, NULL, NFT_DATA_VALUE, len);}
static int nft_socket_dump(struct sk_buff *skb, const struct nft_expr *expr, bool reset){ const struct nft_socket *priv = nft_expr_priv(expr);
if (nla_put_be32(skb, NFTA_SOCKET_KEY, htonl(priv->key))) return -1; if (nft_dump_register(skb, NFTA_SOCKET_DREG, priv->dreg)) return -1; if (priv->key == NFT_SOCKET_CGROUPV2 && nla_put_be32(skb, NFTA_SOCKET_LEVEL, htonl(priv->level_user))) return -1; return 0;}
static int nft_socket_validate(const struct nft_ctx *ctx, const struct nft_expr *expr){ if (ctx->family != NFPROTO_IPV4 && ctx->family != NFPROTO_IPV6 && ctx->family != NFPROTO_INET) return -EOPNOTSUPP;
return nft_chain_validate_hooks(ctx->chain, (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_LOCAL_OUT));}
static struct nft_expr_type nft_socket_type;static const struct nft_expr_ops nft_socket_ops = { .type = &nft_socket_type, .size = NFT_EXPR_SIZE(sizeof(struct nft_socket)), .eval = nft_socket_eval, .init = nft_socket_init, .dump = nft_socket_dump, .validate = nft_socket_validate,};
static struct nft_expr_type nft_socket_type __read_mostly = { .name = "socket", .ops = &nft_socket_ops, .policy = nft_socket_policy, .maxattr = NFTA_SOCKET_MAX, .owner = THIS_MODULE,};
static int __init nft_socket_module_init(void){ return nft_register_expr(&nft_socket_type);}
static void __exit nft_socket_module_exit(void){ nft_unregister_expr(&nft_socket_type);}
module_init(nft_socket_module_init);module_exit(nft_socket_module_exit);
MODULE_LICENSE("GPL");MODULE_AUTHOR("Máté Eckl");MODULE_DESCRIPTION("nf_tables socket match module");MODULE_ALIAS_NFT_EXPR("socket");