273 lines
7.5 KiB
C
273 lines
7.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Monitoring SMC transport protocol sockets
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/sock_diag.h>
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#include <linux/inet_diag.h>
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#include <linux/smc_diag.h>
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#include <net/netlink.h>
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#include <net/smc.h>
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#include "smc.h"
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#include "smc_core.h"
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struct smc_diag_dump_ctx {
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int pos[2];
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};
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static struct smc_diag_dump_ctx *smc_dump_context(struct netlink_callback *cb)
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{
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return (struct smc_diag_dump_ctx *)cb->ctx;
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}
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static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk)
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{
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struct smc_sock *smc = smc_sk(sk);
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memset(r, 0, sizeof(*r));
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r->diag_family = sk->sk_family;
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sock_diag_save_cookie(sk, r->id.idiag_cookie);
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if (!smc->clcsock)
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return;
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r->id.idiag_sport = htons(smc->clcsock->sk->sk_num);
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r->id.idiag_dport = smc->clcsock->sk->sk_dport;
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r->id.idiag_if = smc->clcsock->sk->sk_bound_dev_if;
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if (sk->sk_protocol == SMCPROTO_SMC) {
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r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr;
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r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr;
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#if IS_ENABLED(CONFIG_IPV6)
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} else if (sk->sk_protocol == SMCPROTO_SMC6) {
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memcpy(&r->id.idiag_src, &smc->clcsock->sk->sk_v6_rcv_saddr,
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sizeof(smc->clcsock->sk->sk_v6_rcv_saddr));
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memcpy(&r->id.idiag_dst, &smc->clcsock->sk->sk_v6_daddr,
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sizeof(smc->clcsock->sk->sk_v6_daddr));
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#endif
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}
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}
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static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
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struct smc_diag_msg *r,
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struct user_namespace *user_ns)
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{
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if (nla_put_u8(skb, SMC_DIAG_SHUTDOWN, sk->sk_shutdown))
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return 1;
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r->diag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
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r->diag_inode = sock_i_ino(sk);
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return 0;
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}
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static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
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struct netlink_callback *cb,
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const struct smc_diag_req *req,
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struct nlattr *bc)
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{
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struct smc_sock *smc = smc_sk(sk);
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struct smc_diag_fallback fallback;
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struct user_namespace *user_ns;
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struct smc_diag_msg *r;
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struct nlmsghdr *nlh;
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nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
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cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI);
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if (!nlh)
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return -EMSGSIZE;
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r = nlmsg_data(nlh);
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smc_diag_msg_common_fill(r, sk);
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r->diag_state = sk->sk_state;
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if (smc->use_fallback)
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r->diag_mode = SMC_DIAG_MODE_FALLBACK_TCP;
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else if (smc_conn_lgr_valid(&smc->conn) && smc->conn.lgr->is_smcd)
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r->diag_mode = SMC_DIAG_MODE_SMCD;
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else
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r->diag_mode = SMC_DIAG_MODE_SMCR;
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user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk);
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if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns))
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goto errout;
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fallback.reason = smc->fallback_rsn;
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fallback.peer_diagnosis = smc->peer_diagnosis;
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if (nla_put(skb, SMC_DIAG_FALLBACK, sizeof(fallback), &fallback) < 0)
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goto errout;
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if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) &&
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smc->conn.alert_token_local) {
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struct smc_connection *conn = &smc->conn;
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struct smc_diag_conninfo cinfo = {
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.token = conn->alert_token_local,
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.sndbuf_size = conn->sndbuf_desc ?
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conn->sndbuf_desc->len : 0,
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.rmbe_size = conn->rmb_desc ? conn->rmb_desc->len : 0,
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.peer_rmbe_size = conn->peer_rmbe_size,
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.rx_prod.wrap = conn->local_rx_ctrl.prod.wrap,
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.rx_prod.count = conn->local_rx_ctrl.prod.count,
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.rx_cons.wrap = conn->local_rx_ctrl.cons.wrap,
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.rx_cons.count = conn->local_rx_ctrl.cons.count,
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.tx_prod.wrap = conn->local_tx_ctrl.prod.wrap,
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.tx_prod.count = conn->local_tx_ctrl.prod.count,
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.tx_cons.wrap = conn->local_tx_ctrl.cons.wrap,
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.tx_cons.count = conn->local_tx_ctrl.cons.count,
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.tx_prod_flags =
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*(u8 *)&conn->local_tx_ctrl.prod_flags,
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.tx_conn_state_flags =
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*(u8 *)&conn->local_tx_ctrl.conn_state_flags,
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.rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags,
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.rx_conn_state_flags =
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*(u8 *)&conn->local_rx_ctrl.conn_state_flags,
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.tx_prep.wrap = conn->tx_curs_prep.wrap,
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.tx_prep.count = conn->tx_curs_prep.count,
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.tx_sent.wrap = conn->tx_curs_sent.wrap,
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.tx_sent.count = conn->tx_curs_sent.count,
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.tx_fin.wrap = conn->tx_curs_fin.wrap,
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.tx_fin.count = conn->tx_curs_fin.count,
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};
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if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0)
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goto errout;
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}
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if (smc_conn_lgr_valid(&smc->conn) && !smc->conn.lgr->is_smcd &&
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(req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) &&
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!list_empty(&smc->conn.lgr->list)) {
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struct smc_link *link = smc->conn.lnk;
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struct smc_diag_lgrinfo linfo = {
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.role = smc->conn.lgr->role,
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.lnk[0].ibport = link->ibport,
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.lnk[0].link_id = link->link_id,
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};
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memcpy(linfo.lnk[0].ibname,
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smc->conn.lgr->lnk[0].smcibdev->ibdev->name,
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sizeof(link->smcibdev->ibdev->name));
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smc_gid_be16_convert(linfo.lnk[0].gid, link->gid);
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smc_gid_be16_convert(linfo.lnk[0].peer_gid, link->peer_gid);
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if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
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goto errout;
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}
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if (smc_conn_lgr_valid(&smc->conn) && smc->conn.lgr->is_smcd &&
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(req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) &&
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!list_empty(&smc->conn.lgr->list)) {
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struct smc_connection *conn = &smc->conn;
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struct smcd_diag_dmbinfo dinfo;
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struct smcd_dev *smcd = conn->lgr->smcd;
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memset(&dinfo, 0, sizeof(dinfo));
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dinfo.linkid = *((u32 *)conn->lgr->id);
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dinfo.peer_gid = conn->lgr->peer_gid;
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dinfo.my_gid = smcd->ops->get_local_gid(smcd);
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dinfo.token = conn->rmb_desc->token;
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dinfo.peer_token = conn->peer_token;
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if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0)
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goto errout;
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}
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nlmsg_end(skb, nlh);
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return 0;
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errout:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
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struct netlink_callback *cb, int p_type)
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{
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struct smc_diag_dump_ctx *cb_ctx = smc_dump_context(cb);
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struct net *net = sock_net(skb->sk);
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int snum = cb_ctx->pos[p_type];
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struct nlattr *bc = NULL;
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struct hlist_head *head;
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int rc = 0, num = 0;
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struct sock *sk;
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read_lock(&prot->h.smc_hash->lock);
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head = &prot->h.smc_hash->ht;
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if (hlist_empty(head))
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goto out;
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sk_for_each(sk, head) {
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if (!net_eq(sock_net(sk), net))
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continue;
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if (num < snum)
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goto next;
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rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
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if (rc < 0)
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goto out;
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next:
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num++;
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}
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out:
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read_unlock(&prot->h.smc_hash->lock);
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cb_ctx->pos[p_type] = num;
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return rc;
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}
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static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
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{
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int rc = 0;
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rc = smc_diag_dump_proto(&smc_proto, skb, cb, SMCPROTO_SMC);
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if (!rc)
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smc_diag_dump_proto(&smc_proto6, skb, cb, SMCPROTO_SMC6);
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return skb->len;
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}
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static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
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{
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struct net *net = sock_net(skb->sk);
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if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
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h->nlmsg_flags & NLM_F_DUMP) {
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{
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struct netlink_dump_control c = {
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.dump = smc_diag_dump,
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.min_dump_alloc = SKB_WITH_OVERHEAD(32768),
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};
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return netlink_dump_start(net->diag_nlsk, skb, h, &c);
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}
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}
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return 0;
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}
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static const struct sock_diag_handler smc_diag_handler = {
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.family = AF_SMC,
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.dump = smc_diag_handler_dump,
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};
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static int __init smc_diag_init(void)
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{
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return sock_diag_register(&smc_diag_handler);
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}
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static void __exit smc_diag_exit(void)
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{
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sock_diag_unregister(&smc_diag_handler);
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}
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module_init(smc_diag_init);
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module_exit(smc_diag_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */);
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MODULE_ALIAS_GENL_FAMILY(SMCR_GENL_FAMILY_NAME);
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