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inet_diag: factorize code in new inet_diag_msg_common_fill() helper
Now the three type of sockets share a common base, we can factorize code in inet_diag_msg_common_fill(). inet_diag_entry no longer requires saddr_storage & daddr_storage and the extra copies. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -44,10 +44,6 @@ struct inet_diag_entry {
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u16 dport;
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u16 family;
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u16 userlocks;
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#if IS_ENABLED(CONFIG_IPV6)
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struct in6_addr saddr_storage; /* for IPv4-mapped-IPv6 addresses */
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struct in6_addr daddr_storage; /* for IPv4-mapped-IPv6 addresses */
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#endif
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};
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static DEFINE_MUTEX(inet_diag_table_mutex);
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@ -70,6 +66,30 @@ static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
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mutex_unlock(&inet_diag_table_mutex);
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}
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static void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
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{
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r->idiag_family = sk->sk_family;
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r->id.idiag_sport = htons(sk->sk_num);
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r->id.idiag_dport = sk->sk_dport;
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r->id.idiag_if = sk->sk_bound_dev_if;
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sock_diag_save_cookie(sk, r->id.idiag_cookie);
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#if IS_ENABLED(CONFIG_IPV6)
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if (sk->sk_family == AF_INET6) {
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*(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
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*(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
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} else
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#endif
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{
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memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
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memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
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r->id.idiag_src[0] = sk->sk_rcv_saddr;
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r->id.idiag_dst[0] = sk->sk_daddr;
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}
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}
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int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
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struct sk_buff *skb, const struct inet_diag_req_v2 *req,
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struct user_namespace *user_ns,
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@ -95,22 +115,11 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
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r = nlmsg_data(nlh);
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BUG_ON((1 << sk->sk_state) & (TCPF_TIME_WAIT | TCPF_NEW_SYN_RECV));
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r->idiag_family = sk->sk_family;
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inet_diag_msg_common_fill(r, sk);
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r->idiag_state = sk->sk_state;
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r->idiag_timer = 0;
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r->idiag_retrans = 0;
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r->id.idiag_if = sk->sk_bound_dev_if;
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sock_diag_save_cookie(sk, r->id.idiag_cookie);
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r->id.idiag_sport = inet->inet_sport;
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r->id.idiag_dport = inet->inet_dport;
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memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
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memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
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r->id.idiag_src[0] = inet->inet_rcv_saddr;
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r->id.idiag_dst[0] = inet->inet_daddr;
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if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
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goto errout;
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@ -124,9 +133,6 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
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#if IS_ENABLED(CONFIG_IPV6)
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if (r->idiag_family == AF_INET6) {
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*(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
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*(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
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if (ext & (1 << (INET_DIAG_TCLASS - 1)))
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if (nla_put_u8(skb, INET_DIAG_TCLASS,
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inet6_sk(sk)->tclass) < 0)
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@ -244,21 +250,9 @@ static int inet_twsk_diag_fill(struct sock *sk,
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if (tmo < 0)
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tmo = 0;
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r->idiag_family = tw->tw_family;
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inet_diag_msg_common_fill(r, sk);
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r->idiag_retrans = 0;
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r->id.idiag_if = tw->tw_bound_dev_if;
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sock_diag_save_cookie(sk, r->id.idiag_cookie);
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r->id.idiag_sport = tw->tw_sport;
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r->id.idiag_dport = tw->tw_dport;
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memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
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memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
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r->id.idiag_src[0] = tw->tw_rcv_saddr;
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r->id.idiag_dst[0] = tw->tw_daddr;
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r->idiag_state = tw->tw_substate;
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r->idiag_timer = 3;
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r->idiag_expires = jiffies_to_msecs(tmo);
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@ -266,12 +260,6 @@ static int inet_twsk_diag_fill(struct sock *sk,
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r->idiag_wqueue = 0;
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r->idiag_uid = 0;
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r->idiag_inode = 0;
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#if IS_ENABLED(CONFIG_IPV6)
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if (tw->tw_family == AF_INET6) {
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*(struct in6_addr *)r->id.idiag_src = tw->tw_v6_rcv_saddr;
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*(struct in6_addr *)r->id.idiag_dst = tw->tw_v6_daddr;
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}
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#endif
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nlmsg_end(skb, nlh);
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return 0;
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@ -485,6 +473,23 @@ static int inet_diag_bc_run(const struct nlattr *_bc,
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return len == 0;
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}
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/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
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*/
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static void entry_fill_addrs(struct inet_diag_entry *entry,
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const struct sock *sk)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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if (sk->sk_family == AF_INET6) {
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entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
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entry->daddr = sk->sk_v6_daddr.s6_addr32;
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} else
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#endif
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{
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entry->saddr = &sk->sk_rcv_saddr;
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entry->daddr = &sk->sk_daddr;
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}
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}
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int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
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{
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struct inet_sock *inet = inet_sk(sk);
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@ -494,16 +499,7 @@ int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
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return 1;
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entry.family = sk->sk_family;
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#if IS_ENABLED(CONFIG_IPV6)
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if (entry.family == AF_INET6) {
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entry.saddr = sk->sk_v6_rcv_saddr.s6_addr32;
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entry.daddr = sk->sk_v6_daddr.s6_addr32;
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} else
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#endif
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{
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entry.saddr = &inet->inet_rcv_saddr;
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entry.daddr = &inet->inet_daddr;
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}
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entry_fill_addrs(&entry, sk);
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entry.sport = inet->inet_num;
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entry.dport = ntohs(inet->inet_dport);
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entry.userlocks = (sk->sk_state != TCP_TIME_WAIT) ? sk->sk_userlocks : 0;
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@ -681,36 +677,6 @@ static int inet_twsk_diag_dump(struct sock *sk,
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cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
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}
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/* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
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* from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
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*/
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static void inet_diag_req_addrs(const struct sock *sk,
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const struct request_sock *req,
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struct inet_diag_entry *entry)
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{
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const struct inet_request_sock *ireq = inet_rsk(req);
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#if IS_ENABLED(CONFIG_IPV6)
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if (sk->sk_family == AF_INET6) {
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if (req->rsk_ops->family == AF_INET6) {
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entry->saddr = ireq->ir_v6_loc_addr.s6_addr32;
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entry->daddr = ireq->ir_v6_rmt_addr.s6_addr32;
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} else if (req->rsk_ops->family == AF_INET) {
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ipv6_addr_set_v4mapped(ireq->ir_loc_addr,
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&entry->saddr_storage);
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ipv6_addr_set_v4mapped(ireq->ir_rmt_addr,
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&entry->daddr_storage);
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entry->saddr = entry->saddr_storage.s6_addr32;
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entry->daddr = entry->daddr_storage.s6_addr32;
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}
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} else
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#endif
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{
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entry->saddr = &ireq->ir_loc_addr;
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entry->daddr = &ireq->ir_rmt_addr;
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}
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}
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static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
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struct request_sock *req,
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struct user_namespace *user_ns,
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@ -728,44 +694,23 @@ static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
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return -EMSGSIZE;
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r = nlmsg_data(nlh);
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r->idiag_family = ireq->ireq_family;
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inet_diag_msg_common_fill(r, (struct sock *)ireq);
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r->idiag_state = TCP_SYN_RECV;
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r->idiag_timer = 1;
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r->idiag_retrans = req->num_retrans;
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r->id.idiag_if = ireq->ir_iif;
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BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
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offsetof(struct sock, sk_cookie));
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sock_diag_save_cookie((struct sock *)ireq, r->id.idiag_cookie);
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tmo = req->expires - jiffies;
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if (tmo < 0)
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tmo = 0;
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r->id.idiag_sport = htons(ireq->ir_num);
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r->id.idiag_dport = ireq->ir_rmt_port;
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memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
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memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
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r->id.idiag_src[0] = ireq->ir_loc_addr;
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r->id.idiag_dst[0] = ireq->ir_rmt_addr;
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r->idiag_expires = jiffies_to_msecs(tmo);
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r->idiag_rqueue = 0;
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r->idiag_wqueue = 0;
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r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
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r->idiag_inode = 0;
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#if IS_ENABLED(CONFIG_IPV6)
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if (r->idiag_family == AF_INET6) {
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struct inet_diag_entry entry;
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inet_diag_req_addrs(sk, req, &entry);
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memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
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memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
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}
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#endif
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nlmsg_end(skb, nlh);
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return 0;
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@ -816,7 +761,8 @@ static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
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continue;
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if (bc) {
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inet_diag_req_addrs(sk, req, &entry);
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/* Note: entry.sport and entry.userlocks are already set */
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entry_fill_addrs(&entry, (struct sock *)req);
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entry.dport = ntohs(ireq->ir_rmt_port);
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if (!inet_diag_bc_run(bc, &entry))
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