^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * File: af_phonet.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Phonet protocols family
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2008 Nokia Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Authors: Sakari Ailus <sakari.ailus@nokia.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Rémi Denis-Courmont
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/if_phonet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/phonet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <net/phonet/phonet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <net/phonet/pn_dev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) /* Transport protocol registration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static const struct phonet_protocol *proto_tab[PHONET_NPROTO] __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static const struct phonet_protocol *phonet_proto_get(unsigned int protocol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) const struct phonet_protocol *pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if (protocol >= PHONET_NPROTO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) pp = rcu_dereference(proto_tab[protocol]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) if (pp && !try_module_get(pp->prot->owner))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) pp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static inline void phonet_proto_put(const struct phonet_protocol *pp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) module_put(pp->prot->owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) /* protocol family functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static int pn_socket_create(struct net *net, struct socket *sock, int protocol,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) int kern)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct pn_sock *pn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) const struct phonet_protocol *pnp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (protocol == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /* Default protocol selection */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) switch (sock->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) case SOCK_DGRAM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) protocol = PN_PROTO_PHONET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) case SOCK_SEQPACKET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) protocol = PN_PROTO_PIPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return -EPROTONOSUPPORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) pnp = phonet_proto_get(protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (pnp == NULL &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) request_module("net-pf-%d-proto-%d", PF_PHONET, protocol) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) pnp = phonet_proto_get(protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (pnp == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return -EPROTONOSUPPORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (sock->type != pnp->sock_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) err = -EPROTONOSUPPORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) sk = sk_alloc(net, PF_PHONET, GFP_KERNEL, pnp->prot, kern);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (sk == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) sock_init_data(sock, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) sock->state = SS_UNCONNECTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) sock->ops = pnp->ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) sk->sk_protocol = protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) pn = pn_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) pn->sobject = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) pn->dobject = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) pn->resource = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) sk->sk_prot->init(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) phonet_proto_put(pnp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static const struct net_proto_family phonet_proto_family = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) .family = PF_PHONET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) .create = pn_socket_create,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /* Phonet device header operations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static int pn_header_create(struct sk_buff *skb, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) unsigned short type, const void *daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) const void *saddr, unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) u8 *media = skb_push(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (type != ETH_P_PHONET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (!saddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) saddr = dev->dev_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) *media = *(const u8 *)saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static int pn_header_parse(const struct sk_buff *skb, unsigned char *haddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) const u8 *media = skb_mac_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) *haddr = *media;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) const struct header_ops phonet_header_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .create = pn_header_create,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) .parse = pn_header_parse,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) EXPORT_SYMBOL(phonet_header_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * Prepends an ISI header and sends a datagram.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) static int pn_send(struct sk_buff *skb, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) u16 dst, u16 src, u8 res, u8 irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct phonethdr *ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (skb->len + 2 > 0xffff /* Phonet length field limit */ ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) skb->len + sizeof(struct phonethdr) > dev->mtu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) err = -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) /* Broadcast sending is not implemented */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) if (pn_addr(dst) == PNADDR_BROADCAST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) err = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) skb_reset_transport_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) WARN_ON(skb_headroom(skb) & 1); /* HW assumes word alignment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) skb_push(skb, sizeof(struct phonethdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) ph = pn_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) ph->pn_rdev = pn_dev(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) ph->pn_sdev = pn_dev(src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) ph->pn_res = res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) ph->pn_length = __cpu_to_be16(skb->len + 2 - sizeof(*ph));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) ph->pn_robj = pn_obj(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) ph->pn_sobj = pn_obj(src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) skb->protocol = htons(ETH_P_PHONET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) skb->priority = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) skb->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (skb->pkt_type == PACKET_LOOPBACK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) skb_reset_mac_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) skb_orphan(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) err = (irq ? netif_rx(skb) : netif_rx_ni(skb)) ? -ENOBUFS : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) err = dev_hard_header(skb, dev, ntohs(skb->protocol),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) NULL, NULL, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) err = -EHOSTUNREACH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) err = dev_queue_xmit(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (unlikely(err > 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) err = net_xmit_errno(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static int pn_raw_send(const void *data, int len, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) u16 dst, u16 src, u8 res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) struct sk_buff *skb = alloc_skb(MAX_PHONET_HEADER + len, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (skb == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (phonet_address_lookup(dev_net(dev), pn_addr(dst)) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) skb->pkt_type = PACKET_LOOPBACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) skb_reserve(skb, MAX_PHONET_HEADER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) __skb_put(skb, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) skb_copy_to_linear_data(skb, data, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) return pn_send(skb, dev, dst, src, res, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) * Create a Phonet header for the skb and send it out. Returns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) * non-zero error code if failed. The skb is freed then.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) int pn_skb_send(struct sock *sk, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) const struct sockaddr_pn *target)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) struct net *net = sock_net(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) struct pn_sock *pn = pn_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) u16 src, dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) u8 daddr, saddr, res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) src = pn->sobject;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (target != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) dst = pn_sockaddr_get_object(target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) res = pn_sockaddr_get_resource(target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) dst = pn->dobject;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) res = pn->resource;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) daddr = pn_addr(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) err = -EHOSTUNREACH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (sk->sk_bound_dev_if)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) dev = dev_get_by_index(net, sk->sk_bound_dev_if);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) else if (phonet_address_lookup(net, daddr) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) dev = phonet_device_get(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) skb->pkt_type = PACKET_LOOPBACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) } else if (dst == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) /* Resource routing (small race until phonet_rcv()) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) struct sock *sk = pn_find_sock_by_res(net, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if (sk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) sock_put(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) dev = phonet_device_get(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) skb->pkt_type = PACKET_LOOPBACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) dev = phonet_route_output(net, daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) dev = phonet_route_output(net, daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) if (!dev || !(dev->flags & IFF_UP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) saddr = phonet_address_get(dev, daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) if (saddr == PN_NO_ADDR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) if (!pn_addr(src))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) src = pn_object(saddr, pn_obj(src));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) err = pn_send(skb, dev, dst, src, res, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if (dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) EXPORT_SYMBOL(pn_skb_send);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) /* Do not send an error message in response to an error message */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) static inline int can_respond(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) const struct phonethdr *ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) const struct phonetmsg *pm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) u8 submsg_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (!pskb_may_pull(skb, 3))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) ph = pn_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) if (ph->pn_res == PN_PREFIX && !pskb_may_pull(skb, 5))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) if (ph->pn_res == PN_COMMGR) /* indications */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) ph = pn_hdr(skb); /* re-acquires the pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) pm = pn_msg(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) if (pm->pn_msg_id != PN_COMMON_MESSAGE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) submsg_id = (ph->pn_res == PN_PREFIX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) ? pm->pn_e_submsg_id : pm->pn_submsg_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (submsg_id != PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) pm->pn_e_submsg_id != PN_COMM_SERVICE_NOT_IDENTIFIED_RESP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) static int send_obj_unreachable(struct sk_buff *rskb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) const struct phonethdr *oph = pn_hdr(rskb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) const struct phonetmsg *opm = pn_msg(rskb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) struct phonetmsg resp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) memset(&resp, 0, sizeof(resp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) resp.pn_trans_id = opm->pn_trans_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) resp.pn_msg_id = PN_COMMON_MESSAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) if (oph->pn_res == PN_PREFIX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) resp.pn_e_res_id = opm->pn_e_res_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) resp.pn_e_submsg_id = PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) resp.pn_e_orig_msg_id = opm->pn_msg_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) resp.pn_e_status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) resp.pn_submsg_id = PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) resp.pn_orig_msg_id = opm->pn_msg_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) resp.pn_status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) return pn_raw_send(&resp, sizeof(resp), rskb->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) pn_object(oph->pn_sdev, oph->pn_sobj),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) pn_object(oph->pn_rdev, oph->pn_robj),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) oph->pn_res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) static int send_reset_indications(struct sk_buff *rskb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) struct phonethdr *oph = pn_hdr(rskb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) static const u8 data[4] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 0x00 /* trans ID */, 0x10 /* subscribe msg */,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 0x00 /* subscription count */, 0x00 /* dummy */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) return pn_raw_send(data, sizeof(data), rskb->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) pn_object(oph->pn_sdev, 0x00),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) pn_object(oph->pn_rdev, oph->pn_robj),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) PN_COMMGR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) /* packet type functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) * Stuff received packets to associated sockets.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) * On error, returns non-zero and releases the skb.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) static int phonet_rcv(struct sk_buff *skb, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) struct packet_type *pkttype,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) struct net_device *orig_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) struct net *net = dev_net(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) struct phonethdr *ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) struct sockaddr_pn sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) u16 len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) skb = skb_share_check(skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) /* check we have at least a full Phonet header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if (!pskb_pull(skb, sizeof(struct phonethdr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) /* check that the advertised length is correct */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) ph = pn_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) len = get_unaligned_be16(&ph->pn_length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) if (len < 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) len -= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) if ((len > skb->len) || pskb_trim(skb, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) skb_reset_transport_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) pn_skb_get_dst_sockaddr(skb, &sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) /* check if this is broadcasted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) if (pn_sockaddr_get_addr(&sa) == PNADDR_BROADCAST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) pn_deliver_sock_broadcast(net, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) /* resource routing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) if (pn_sockaddr_get_object(&sa) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) struct sock *sk = pn_find_sock_by_res(net, sa.spn_resource);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) if (sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) return sk_receive_skb(sk, skb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) /* check if we are the destination */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) if (phonet_address_lookup(net, pn_sockaddr_get_addr(&sa)) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) /* Phonet packet input */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) struct sock *sk = pn_find_sock_by_sa(net, &sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) if (sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) return sk_receive_skb(sk, skb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (can_respond(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) send_obj_unreachable(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) send_reset_indications(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) } else if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) goto out; /* Race between address deletion and loopback */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) /* Phonet packet routing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) struct net_device *out_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) out_dev = phonet_route_output(net, pn_sockaddr_get_addr(&sa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) if (!out_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) net_dbg_ratelimited("No Phonet route to %02X\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) pn_sockaddr_get_addr(&sa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) __skb_push(skb, sizeof(struct phonethdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) skb->dev = out_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) if (out_dev == dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) net_dbg_ratelimited("Phonet loop to %02X on %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) pn_sockaddr_get_addr(&sa),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) dev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) goto out_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) /* Some drivers (e.g. TUN) do not allocate HW header space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) if (skb_cow_head(skb, out_dev->hard_header_len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) goto out_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (dev_hard_header(skb, out_dev, ETH_P_PHONET, NULL, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) skb->len) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) goto out_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) dev_queue_xmit(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) dev_put(out_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) return NET_RX_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) out_dev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) dev_put(out_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) static struct packet_type phonet_packet_type __read_mostly = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) .type = cpu_to_be16(ETH_P_PHONET),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) .func = phonet_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) static DEFINE_MUTEX(proto_tab_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) int __init_or_module phonet_proto_register(unsigned int protocol,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) const struct phonet_protocol *pp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if (protocol >= PHONET_NPROTO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) err = proto_register(pp->prot, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) mutex_lock(&proto_tab_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) if (proto_tab[protocol])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) err = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) rcu_assign_pointer(proto_tab[protocol], pp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) mutex_unlock(&proto_tab_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) EXPORT_SYMBOL(phonet_proto_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) void phonet_proto_unregister(unsigned int protocol,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) const struct phonet_protocol *pp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) mutex_lock(&proto_tab_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) BUG_ON(proto_tab[protocol] != pp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) RCU_INIT_POINTER(proto_tab[protocol], NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) mutex_unlock(&proto_tab_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) synchronize_rcu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) proto_unregister(pp->prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) EXPORT_SYMBOL(phonet_proto_unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) /* Module registration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) static int __init phonet_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) err = phonet_device_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) pn_sock_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) err = sock_register(&phonet_proto_family);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) printk(KERN_ALERT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) "phonet protocol family initialization failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) goto err_sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) dev_add_pack(&phonet_packet_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) phonet_sysctl_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) err = isi_register();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) phonet_sysctl_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) sock_unregister(PF_PHONET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) dev_remove_pack(&phonet_packet_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) err_sock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) phonet_device_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) static void __exit phonet_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) isi_unregister();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) phonet_sysctl_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) sock_unregister(PF_PHONET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) dev_remove_pack(&phonet_packet_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) phonet_device_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) module_init(phonet_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) module_exit(phonet_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) MODULE_DESCRIPTION("Phonet protocol stack for Linux");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) MODULE_ALIAS_NETPROTO(PF_PHONET);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags