diff options
Diffstat (limited to 'net/ipv4/raw_diag.c')
| -rw-r--r-- | net/ipv4/raw_diag.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/net/ipv4/raw_diag.c b/net/ipv4/raw_diag.c new file mode 100644 index 000000000000..ef3bea061b75 --- /dev/null +++ b/net/ipv4/raw_diag.c @@ -0,0 +1,261 @@ +#include <linux/module.h> + +#include <linux/inet_diag.h> +#include <linux/sock_diag.h> + +#include <net/raw.h> +#include <net/rawv6.h> + +#ifdef pr_fmt +# undef pr_fmt +#endif + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +static struct raw_hashinfo * +raw_get_hashinfo(const struct inet_diag_req_v2 *r) +{ + if (r->sdiag_family == AF_INET) { + return &raw_v4_hashinfo; +#if IS_ENABLED(CONFIG_IPV6) + } else if (r->sdiag_family == AF_INET6) { + return &raw_v6_hashinfo; +#endif + } else { + pr_warn_once("Unexpected inet family %d\n", + r->sdiag_family); + WARN_ON_ONCE(1); + return ERR_PTR(-EINVAL); + } +} + +/* + * Due to requirement of not breaking user API we can't simply + * rename @pad field in inet_diag_req_v2 structure, instead + * use helper to figure it out. + */ + +static struct sock *raw_lookup(struct net *net, struct sock *from, + const struct inet_diag_req_v2 *req) +{ + struct inet_diag_req_raw *r = (void *)req; + struct sock *sk = NULL; + + if (r->sdiag_family == AF_INET) + sk = __raw_v4_lookup(net, from, r->sdiag_raw_protocol, + r->id.idiag_dst[0], + r->id.idiag_src[0], + r->id.idiag_if); +#if IS_ENABLED(CONFIG_IPV6) + else + sk = __raw_v6_lookup(net, from, r->sdiag_raw_protocol, + (const struct in6_addr *)r->id.idiag_src, + (const struct in6_addr *)r->id.idiag_dst, + r->id.idiag_if); +#endif + return sk; +} + +static struct sock *raw_sock_get(struct net *net, const struct inet_diag_req_v2 *r) +{ + struct raw_hashinfo *hashinfo = raw_get_hashinfo(r); + struct sock *sk = NULL, *s; + int slot; + + if (IS_ERR(hashinfo)) + return ERR_CAST(hashinfo); + + read_lock(&hashinfo->lock); + for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) { + sk_for_each(s, &hashinfo->ht[slot]) { + sk = raw_lookup(net, s, r); + if (sk) { + /* + * Grab it and keep until we fill + * diag meaage to be reported, so + * caller should call sock_put then. + * We can do that because we're keeping + * hashinfo->lock here. + */ + sock_hold(sk); + break; + } + } + } + read_unlock(&hashinfo->lock); + + return sk ? sk : ERR_PTR(-ENOENT); +} + +static int raw_diag_dump_one(struct sk_buff *in_skb, + const struct nlmsghdr *nlh, + const struct inet_diag_req_v2 *r) +{ + struct net *net = sock_net(in_skb->sk); + struct sk_buff *rep; + struct sock *sk; + int err; + + sk = raw_sock_get(net, r); + if (IS_ERR(sk)) + return PTR_ERR(sk); + + rep = nlmsg_new(sizeof(struct inet_diag_msg) + + sizeof(struct inet_diag_meminfo) + 64, + GFP_KERNEL); + if (!rep) { + sock_put(sk); + return -ENOMEM; + } + + err = inet_sk_diag_fill(sk, NULL, rep, r, + sk_user_ns(NETLINK_CB(in_skb).sk), + NETLINK_CB(in_skb).portid, + nlh->nlmsg_seq, 0, nlh, + netlink_net_capable(in_skb, CAP_NET_ADMIN)); + sock_put(sk); + + if (err < 0) { + kfree_skb(rep); + return err; + } + + err = netlink_unicast(net->diag_nlsk, rep, + NETLINK_CB(in_skb).portid, + MSG_DONTWAIT); + if (err > 0) + err = 0; + return err; +} + +static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, + struct netlink_callback *cb, + const struct inet_diag_req_v2 *r, + struct nlattr *bc, bool net_admin) +{ + if (!inet_diag_bc_sk(bc, sk)) + return 0; + + return inet_sk_diag_fill(sk, NULL, skb, r, + sk_user_ns(NETLINK_CB(cb->skb).sk), + NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, NLM_F_MULTI, + cb->nlh, net_admin); +} + +static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, + const struct inet_diag_req_v2 *r, struct nlattr *bc) +{ + bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); + struct raw_hashinfo *hashinfo = raw_get_hashinfo(r); + struct net *net = sock_net(skb->sk); + int num, s_num, slot, s_slot; + struct sock *sk = NULL; + + if (IS_ERR(hashinfo)) + return; + + s_slot = cb->args[0]; + num = s_num = cb->args[1]; + + read_lock(&hashinfo->lock); + for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) { + num = 0; + + sk_for_each(sk, &hashinfo->ht[slot]) { + struct inet_sock *inet = inet_sk(sk); + + if (!net_eq(sock_net(sk), net)) + continue; + if (num < s_num) + goto next; + if (sk->sk_family != r->sdiag_family) + goto next; + if (r->id.idiag_sport != inet->inet_sport && + r->id.idiag_sport) + goto next; + if (r->id.idiag_dport != inet->inet_dport && + r->id.idiag_dport) + goto next; + if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) + goto out_unlock; +next: + num++; + } + } + +out_unlock: + read_unlock(&hashinfo->lock); + + cb->args[0] = slot; + cb->args[1] = num; +} + +static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r, + void *info) +{ + r->idiag_rqueue = sk_rmem_alloc_get(sk); + r->idiag_wqueue = sk_wmem_alloc_get(sk); +} + +#ifdef CONFIG_INET_DIAG_DESTROY +static int raw_diag_destroy(struct sk_buff *in_skb, + const struct inet_diag_req_v2 *r) +{ + struct net *net = sock_net(in_skb->sk); + struct sock *sk; + + sk = raw_sock_get(net, r); + if (IS_ERR(sk)) + return PTR_ERR(sk); + return sock_diag_destroy(sk, ECONNABORTED); +} +#endif + +static const struct inet_diag_handler raw_diag_handler = { + .dump = raw_diag_dump, + .dump_one = raw_diag_dump_one, + .idiag_get_info = raw_diag_get_info, + .idiag_type = IPPROTO_RAW, + .idiag_info_size = 0, +#ifdef CONFIG_INET_DIAG_DESTROY + .destroy = raw_diag_destroy, +#endif +}; + +static void __always_unused __check_inet_diag_req_raw(void) +{ + /* + * Make sure the two structures are identical, + * except the @pad field. + */ +#define __offset_mismatch(m1, m2) \ + (offsetof(struct inet_diag_req_v2, m1) != \ + offsetof(struct inet_diag_req_raw, m2)) + + BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) != + sizeof(struct inet_diag_req_raw)); + BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family)); + BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol)); + BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext)); + BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol)); + BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states)); + BUILD_BUG_ON(__offset_mismatch(id, id)); +#undef __offset_mismatch +} + +static int __init raw_diag_init(void) +{ + return inet_diag_register(&raw_diag_handler); +} + +static void __exit raw_diag_exit(void) +{ + inet_diag_unregister(&raw_diag_handler); +} + +module_init(raw_diag_init); +module_exit(raw_diag_exit); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */); +MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */); |