1 // SPDX-License-Identifier: GPL-2.0 2 /* XDP sockets monitoring support 3 * 4 * Copyright(c) 2019 Intel Corporation. 5 * 6 * Author: Björn Töpel <bjorn.topel@intel.com> 7 */ 8 9 #include <linux/module.h> 10 #include <net/xdp_sock.h> 11 #include <linux/xdp_diag.h> 12 #include <linux/sock_diag.h> 13 14 #include "xsk_queue.h" 15 #include "xsk.h" 16 17 static int xsk_diag_put_info(const struct xdp_sock *xs, struct sk_buff *nlskb) 18 { 19 struct xdp_diag_info di = {}; 20 21 di.ifindex = xs->dev ? xs->dev->ifindex : 0; 22 di.queue_id = xs->queue_id; 23 return nla_put(nlskb, XDP_DIAG_INFO, sizeof(di), &di); 24 } 25 26 static int xsk_diag_put_ring(const struct xsk_queue *queue, int nl_type, 27 struct sk_buff *nlskb) 28 { 29 struct xdp_diag_ring dr = {}; 30 31 dr.entries = queue->nentries; 32 return nla_put(nlskb, nl_type, sizeof(dr), &dr); 33 } 34 35 static int xsk_diag_put_rings_cfg(const struct xdp_sock *xs, 36 struct sk_buff *nlskb) 37 { 38 int err = 0; 39 40 if (xs->rx) 41 err = xsk_diag_put_ring(xs->rx, XDP_DIAG_RX_RING, nlskb); 42 if (!err && xs->tx) 43 err = xsk_diag_put_ring(xs->tx, XDP_DIAG_TX_RING, nlskb); 44 return err; 45 } 46 47 static int xsk_diag_put_umem(const struct xdp_sock *xs, struct sk_buff *nlskb) 48 { 49 struct xdp_umem *umem = xs->umem; 50 struct xdp_diag_umem du = {}; 51 int err; 52 53 if (!umem) 54 return 0; 55 56 du.id = umem->id; 57 du.size = umem->size; 58 du.num_pages = umem->npgs; 59 du.chunk_size = umem->chunk_size_nohr + umem->headroom; 60 du.headroom = umem->headroom; 61 du.ifindex = umem->dev ? umem->dev->ifindex : 0; 62 du.queue_id = umem->queue_id; 63 du.flags = 0; 64 if (umem->zc) 65 du.flags |= XDP_DU_F_ZEROCOPY; 66 du.refs = refcount_read(&umem->users); 67 68 err = nla_put(nlskb, XDP_DIAG_UMEM, sizeof(du), &du); 69 70 if (!err && umem->fq) 71 err = xsk_diag_put_ring(umem->fq, XDP_DIAG_UMEM_FILL_RING, nlskb); 72 if (!err && umem->cq) { 73 err = xsk_diag_put_ring(umem->cq, XDP_DIAG_UMEM_COMPLETION_RING, 74 nlskb); 75 } 76 return err; 77 } 78 79 static int xsk_diag_fill(struct sock *sk, struct sk_buff *nlskb, 80 struct xdp_diag_req *req, 81 struct user_namespace *user_ns, 82 u32 portid, u32 seq, u32 flags, int sk_ino) 83 { 84 struct xdp_sock *xs = xdp_sk(sk); 85 struct xdp_diag_msg *msg; 86 struct nlmsghdr *nlh; 87 88 nlh = nlmsg_put(nlskb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*msg), 89 flags); 90 if (!nlh) 91 return -EMSGSIZE; 92 93 msg = nlmsg_data(nlh); 94 memset(msg, 0, sizeof(*msg)); 95 msg->xdiag_family = AF_XDP; 96 msg->xdiag_type = sk->sk_type; 97 msg->xdiag_ino = sk_ino; 98 sock_diag_save_cookie(sk, msg->xdiag_cookie); 99 100 mutex_lock(&xs->mutex); 101 if ((req->xdiag_show & XDP_SHOW_INFO) && xsk_diag_put_info(xs, nlskb)) 102 goto out_nlmsg_trim; 103 104 if ((req->xdiag_show & XDP_SHOW_INFO) && 105 nla_put_u32(nlskb, XDP_DIAG_UID, 106 from_kuid_munged(user_ns, sock_i_uid(sk)))) 107 goto out_nlmsg_trim; 108 109 if ((req->xdiag_show & XDP_SHOW_RING_CFG) && 110 xsk_diag_put_rings_cfg(xs, nlskb)) 111 goto out_nlmsg_trim; 112 113 if ((req->xdiag_show & XDP_SHOW_UMEM) && 114 xsk_diag_put_umem(xs, nlskb)) 115 goto out_nlmsg_trim; 116 117 if ((req->xdiag_show & XDP_SHOW_MEMINFO) && 118 sock_diag_put_meminfo(sk, nlskb, XDP_DIAG_MEMINFO)) 119 goto out_nlmsg_trim; 120 121 mutex_unlock(&xs->mutex); 122 nlmsg_end(nlskb, nlh); 123 return 0; 124 125 out_nlmsg_trim: 126 mutex_unlock(&xs->mutex); 127 nlmsg_cancel(nlskb, nlh); 128 return -EMSGSIZE; 129 } 130 131 static int xsk_diag_dump(struct sk_buff *nlskb, struct netlink_callback *cb) 132 { 133 struct xdp_diag_req *req = nlmsg_data(cb->nlh); 134 struct net *net = sock_net(nlskb->sk); 135 int num = 0, s_num = cb->args[0]; 136 struct sock *sk; 137 138 mutex_lock(&net->xdp.lock); 139 140 sk_for_each(sk, &net->xdp.list) { 141 if (!net_eq(sock_net(sk), net)) 142 continue; 143 if (num++ < s_num) 144 continue; 145 146 if (xsk_diag_fill(sk, nlskb, req, 147 sk_user_ns(NETLINK_CB(cb->skb).sk), 148 NETLINK_CB(cb->skb).portid, 149 cb->nlh->nlmsg_seq, NLM_F_MULTI, 150 sock_i_ino(sk)) < 0) { 151 num--; 152 break; 153 } 154 } 155 156 mutex_unlock(&net->xdp.lock); 157 cb->args[0] = num; 158 return nlskb->len; 159 } 160 161 static int xsk_diag_handler_dump(struct sk_buff *nlskb, struct nlmsghdr *hdr) 162 { 163 struct netlink_dump_control c = { .dump = xsk_diag_dump }; 164 int hdrlen = sizeof(struct xdp_diag_req); 165 struct net *net = sock_net(nlskb->sk); 166 167 if (nlmsg_len(hdr) < hdrlen) 168 return -EINVAL; 169 170 if (!(hdr->nlmsg_flags & NLM_F_DUMP)) 171 return -EOPNOTSUPP; 172 173 return netlink_dump_start(net->diag_nlsk, nlskb, hdr, &c); 174 } 175 176 static const struct sock_diag_handler xsk_diag_handler = { 177 .family = AF_XDP, 178 .dump = xsk_diag_handler_dump, 179 }; 180 181 static int __init xsk_diag_init(void) 182 { 183 return sock_diag_register(&xsk_diag_handler); 184 } 185 186 static void __exit xsk_diag_exit(void) 187 { 188 sock_diag_unregister(&xsk_diag_handler); 189 } 190 191 module_init(xsk_diag_init); 192 module_exit(xsk_diag_exit); 193 MODULE_LICENSE("GPL"); 194 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, AF_XDP); 195