sd-pppoe: drop

It is really unclear if we want to / have the resources to support this fully, so drop it
for now. It can easily be brought back if a killer usecase emerges.

Note that this code was never hooked up, so this does not remove any features.

1 files changed, 0 insertions, 813 deletions

diff --git a/src/libsystemd-network/sd-pppoe.c b/src/libsystemd-network/sd-pppoe.c
deleted file mode 100644
index 045decc46c..0000000000
--- a/src/libsystemd-network/sd-pppoe.c
+++ /dev/null
@@ -1,813 +0,0 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
-  This file is part of systemd.
-
-  Copyright (C) 2014 Tom Gundersen
-
-  systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU Lesser General Public License as published by
-  the Free Software Foundation; either version 2.1 of the License, or
-  (at your option) any later version.
-
-  systemd is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-  Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-/* See RFC 2516 */
-
-#include <net/if.h>
-#include <netinet/in.h>
-#include <sys/ioctl.h>
-#include <linux/if_pppox.h>
-#include <linux/ppp_defs.h>
-#include <linux/ppp-ioctl.h>
-
-#include "sd-pppoe.h"
-
-#include "alloc-util.h"
-#include "async.h"
-#include "event-util.h"
-#include "fd-util.h"
-#include "random-util.h"
-#include "socket-util.h"
-#include "sparse-endian.h"
-#include "string-util.h"
-#include "utf8.h"
-#include "util.h"
-
-#define PPPOE_MAX_PACKET_SIZE 1484
-#define PPPOE_MAX_PADR_RESEND 16
-
-/* TODO: move this to socket-util.h without getting into
- * a mess with the includes */
-union sockaddr_union_pppox {
-        struct sockaddr sa;
-        struct sockaddr_pppox pppox;
-};
-
-typedef enum PPPoEState {
-        PPPOE_STATE_INITIALIZING,
-        PPPOE_STATE_REQUESTING,
-        PPPOE_STATE_RUNNING,
-        PPPOE_STATE_STOPPED,
-        _PPPOE_STATE_MAX,
-        _PPPOE_STATE_INVALID = -1,
-} PPPoEState;
-
-typedef struct PPPoETags {
-                char *service_name;
-                char *ac_name;
-                uint8_t *host_uniq;
-                size_t host_uniq_len;
-                uint8_t *cookie;
-                size_t cookie_len;
-} PPPoETags;
-
-struct sd_pppoe {
-        unsigned n_ref;
-
-        PPPoEState state;
-        uint64_t host_uniq;
-
-        int ifindex;
-        char *ifname;
-
-        sd_event *event;
-        int event_priority;
-        int fd;
-        sd_event_source *io;
-        sd_event_source *timeout;
-        int padr_resend_count;
-
-        char *service_name;
-        struct ether_addr peer_mac;
-        be16_t session_id;
-
-        int pppoe_fd;
-        int channel;
-
-        sd_pppoe_cb_t cb;
-        void *userdata;
-
-        PPPoETags tags;
-};
-
-#define PPPOE_PACKET_LENGTH(header) \
-        be16toh((header)->length)
-
-#define PPPOE_PACKET_TAIL(packet)                                                                               \
-        (struct pppoe_tag*)((uint8_t*)(packet) + sizeof(struct pppoe_hdr) + PPPOE_PACKET_LENGTH(packet))
-
-#define PPPOE_TAG_LENGTH(tag)  \
-        be16toh((tag)->tag_len)
-
-#define PPPOE_TAG_TYPE(tag) \
-        (tag)->tag_type
-
-#define PPPOE_TAG_NEXT(tag)                                                                      \
-        (struct pppoe_tag *)((uint8_t *)(tag) + sizeof(struct pppoe_tag) + PPPOE_TAG_LENGTH(tag))
-
-#define PPPOE_TAGS_FOREACH(tag, header)                                                                 \
-        for (tag = (header)->tag;                                                                       \
-             ((uint8_t *)(tag) + sizeof(struct pppoe_tag) < (uint8_t*)PPPOE_PACKET_TAIL(header)) &&     \
-                (PPPOE_TAG_NEXT(tag) <= PPPOE_PACKET_TAIL(header)) &&                                   \
-                (tag >= (header)->tag) &&                                                               \
-                (PPPOE_TAG_TYPE(tag) != PTT_EOL);                                                           \
-             tag = PPPOE_TAG_NEXT(tag))
-
-static void pppoe_tags_clear(PPPoETags *tags) {
-        free(tags->service_name);
-        free(tags->ac_name);
-        free(tags->host_uniq);
-        free(tags->cookie);
-
-        zero(*tags);
-}
-
-int sd_pppoe_set_ifindex(sd_pppoe *ppp, int ifindex) {
-        assert_return(ppp, -EINVAL);
-        assert_return(ifindex > 0, -EINVAL);
-
-        ppp->ifindex = ifindex;
-
-        return 0;
-}
-
-int sd_pppoe_set_ifname(sd_pppoe *ppp, const char *ifname) {
-        char *name;
-
-        assert_return(ppp, -EINVAL);
-        assert_return(ifname, -EINVAL);
-
-        if (strlen(ifname) > IFNAMSIZ)
-                return -EINVAL;
-
-        name = strdup(ifname);
-        if (!name)
-                return -ENOMEM;
-
-        free(ppp->ifname);
-        ppp->ifname = name;
-
-        return 0;
-}
-
-int sd_pppoe_set_service_name(sd_pppoe *ppp, const char *service_name) {
-        _cleanup_free_ char *name = NULL;
-
-        assert_return(ppp, -EINVAL);
-
-        if (service_name) {
-                name = strdup(service_name);
-                if (!name)
-                        return -ENOMEM;
-        }
-
-        free(ppp->service_name);
-        ppp->service_name = name;
-        name = NULL;
-
-        return 0;
-}
-
-int sd_pppoe_attach_event(sd_pppoe *ppp, sd_event *event, int priority) {
-        int r;
-
-        assert_return(ppp, -EINVAL);
-        assert_return(!ppp->event, -EBUSY);
-
-        if (event)
-                ppp->event = sd_event_ref(event);
-        else {
-                r = sd_event_default(&ppp->event);
-                if (r < 0)
-                        return r;
-        }
-
-        ppp->event_priority = priority;
-
-        return 0;
-}
-
-int sd_pppoe_detach_event(sd_pppoe *ppp) {
-        assert_return(ppp, -EINVAL);
-
-        ppp->event = sd_event_unref(ppp->event);
-
-        return 0;
-}
-
-sd_pppoe *sd_pppoe_ref(sd_pppoe *ppp) {
-
-        if (!ppp)
-                return NULL;
-
-        assert(ppp->n_ref > 0);
-        ppp->n_ref++;
-
-        return ppp;
-}
-
-sd_pppoe *sd_pppoe_unref(sd_pppoe *ppp) {
-
-        if (!ppp)
-                return NULL;
-
-        assert(ppp->n_ref > 0);
-        ppp->n_ref--;
-
-        if (ppp->n_ref > 0)
-                return NULL;
-
-        pppoe_tags_clear(&ppp->tags);
-        free(ppp->ifname);
-        free(ppp->service_name);
-        sd_pppoe_stop(ppp);
-        sd_pppoe_detach_event(ppp);
-
-        free(ppp);
-        return NULL;
-}
-
-int sd_pppoe_new (sd_pppoe **ret) {
-        sd_pppoe *ppp;
-
-        assert_return(ret, -EINVAL);
-
-        ppp = new0(sd_pppoe, 1);
-        if (!ppp)
-                return -ENOMEM;
-
-        ppp->n_ref = 1;
-        ppp->state = _PPPOE_STATE_INVALID;
-        ppp->ifindex = -1;
-        ppp->fd = -1;
-        ppp->pppoe_fd = -1;
-        ppp->padr_resend_count = PPPOE_MAX_PADR_RESEND;
-
-        *ret = ppp;
-
-        return 0;
-}
-
-int sd_pppoe_get_channel(sd_pppoe *ppp, int *channel) {
-        assert_return(ppp, -EINVAL);
-        assert_return(channel, -EINVAL);
-        assert_return(ppp->pppoe_fd != -1, -EUNATCH);
-        assert_return(ppp->state == PPPOE_STATE_RUNNING, -EUNATCH);
-
-        *channel = ppp->channel;
-
-        return 0;
-}
-
-int sd_pppoe_set_callback(sd_pppoe *ppp, sd_pppoe_cb_t cb, void *userdata) {
-        assert_return(ppp, -EINVAL);
-
-        ppp->cb = cb;
-        ppp->userdata = userdata;
-
-        return 0;
-}
-
-static void pppoe_tag_append(struct pppoe_hdr *packet, size_t packet_size, be16_t tag_type, const void *tag_data, uint16_t tag_len) {
-        struct pppoe_tag *tag;
-
-        assert(packet);
-        assert(sizeof(struct pppoe_hdr) + PPPOE_PACKET_LENGTH(packet) + sizeof(struct pppoe_tag) + tag_len <= packet_size);
-        assert(!(!tag_data ^ !tag_len));
-
-        tag = PPPOE_PACKET_TAIL(packet);
-
-        tag->tag_len = htobe16(tag_len);
-        tag->tag_type = tag_type;
-        if (tag_data)
-                memcpy(tag->tag_data, tag_data, tag_len);
-
-        packet->length = htobe16(PPPOE_PACKET_LENGTH(packet) + sizeof(struct pppoe_tag) + tag_len);
-}
-
-static int pppoe_send(sd_pppoe *ppp, uint8_t code) {
-        union sockaddr_union link = {
-                .ll = {
-                        .sll_family = AF_PACKET,
-                        .sll_protocol = htons(ETH_P_PPP_DISC),
-                        .sll_halen = ETH_ALEN,
-                },
-        };
-        _cleanup_free_ struct pppoe_hdr *packet = NULL;
-        int r;
-
-        assert(ppp);
-        assert(ppp->fd != -1);
-        assert(IN_SET(code, PADI_CODE, PADR_CODE, PADT_CODE));
-
-        link.ll.sll_ifindex = ppp->ifindex;
-        if (code == PADI_CODE)
-                memset(&link.ll.sll_addr, 0xff, ETH_ALEN);
-        else
-                memcpy(&link.ll.sll_addr, &ppp->peer_mac, ETH_ALEN);
-
-        packet = malloc0(PPPOE_MAX_PACKET_SIZE);
-        if (!packet)
-                return -ENOMEM;
-
-        packet->ver = 0x1;
-        packet->type = 0x1;
-        packet->code = code;
-        if (code == PADT_CODE)
-                packet->sid = ppp->session_id;
-
-        /* Service-Name */
-        pppoe_tag_append(packet, PPPOE_MAX_PACKET_SIZE, PTT_SRV_NAME,
-                         ppp->service_name, ppp->service_name ? strlen(ppp->service_name) : 0);
-
-        /* AC-Cookie */
-        if (code == PADR_CODE && ppp->tags.cookie)
-                pppoe_tag_append(packet, PPPOE_MAX_PACKET_SIZE, PTT_AC_COOKIE,
-                                 ppp->tags.cookie, ppp->tags.cookie_len);
-
-        /* Host-Uniq */
-        if (code != PADT_CODE) {
-                ppp->host_uniq = random_u64();
-
-                pppoe_tag_append(packet, PPPOE_MAX_PACKET_SIZE, PTT_HOST_UNIQ,
-                                 &ppp->host_uniq, sizeof(ppp->host_uniq));
-        }
-
-        r = sendto(ppp->fd, packet, sizeof(struct pppoe_hdr) + PPPOE_PACKET_LENGTH(packet),
-                   0, &link.sa, sizeof(link.ll));
-        if (r < 0)
-                return -errno;
-
-        return 0;
-}
-
-static int pppoe_timeout(sd_event_source *s, uint64_t usec, void *userdata);
-
-static int pppoe_arm_timeout(sd_pppoe *ppp) {
-        _cleanup_event_source_unref_ sd_event_source *timeout = NULL;
-        usec_t next_timeout = 0;
-        int r;
-
-        assert(ppp);
-
-        r = sd_event_now(ppp->event, clock_boottime_or_monotonic(), &next_timeout);
-        if (r < 0)
-                return r;
-
-        next_timeout += 500 * USEC_PER_MSEC;
-
-        r = sd_event_add_time(ppp->event, &timeout, clock_boottime_or_monotonic(), next_timeout,
-                              10 * USEC_PER_MSEC, pppoe_timeout, ppp);
-        if (r < 0)
-                return r;
-
-        r = sd_event_source_set_priority(timeout, ppp->event_priority);
-        if (r < 0)
-                return r;
-
-        sd_event_source_unref(ppp->timeout);
-        ppp->timeout = timeout;
-        timeout = NULL;
-
-        return 0;
-}
-
-static int pppoe_send_initiation(sd_pppoe *ppp) {
-        int r;
-
-        r = pppoe_send(ppp, PADI_CODE);
-        if (r < 0)
-                return r;
-
-        log_debug("PPPoE: sent DISCOVER (Service-Name: %s)",
-                  strna(ppp->service_name));
-
-        pppoe_arm_timeout(ppp);
-
-        return r;
-}
-
-static int pppoe_send_request(sd_pppoe *ppp) {
-        int r;
-
-        r = pppoe_send(ppp, PADR_CODE);
-        if (r < 0)
-                return r;
-
-        log_debug("PPPoE: sent REQUEST");
-
-        ppp->padr_resend_count --;
-
-        pppoe_arm_timeout(ppp);
-
-        return 0;
-}
-
-static int pppoe_send_terminate(sd_pppoe *ppp) {
-        int r;
-
-        r = pppoe_send(ppp, PADT_CODE);
-        if (r < 0)
-                return r;
-
-        log_debug("PPPoE: sent TERMINATE");
-
-        return 0;
-}
-
-static int pppoe_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
-        sd_pppoe *ppp = userdata;
-        int r;
-
-        assert(ppp);
-
-        switch (ppp->state) {
-        case PPPOE_STATE_INITIALIZING:
-                r = pppoe_send_initiation(ppp);
-                if (r < 0)
-                        log_warning_errno(r, "PPPoE: sending PADI failed: %m");
-
-                break;
-        case PPPOE_STATE_REQUESTING:
-                if (ppp->padr_resend_count <= 0) {
-                        log_debug("PPPoE: PADR timed out, restarting PADI");
-
-                        r = pppoe_send_initiation(ppp);
-                        if (r < 0)
-                                log_warning_errno(r, "PPPoE: sending PADI failed: %m");
-
-                        ppp->padr_resend_count = PPPOE_MAX_PADR_RESEND;
-                        ppp->state = PPPOE_STATE_INITIALIZING;
-                } else {
-                        r = pppoe_send_request(ppp);
-                        if (r < 0)
-                                log_warning_errno(r, "PPPoE: sending PADR failed: %m");
-                }
-
-                break;
-        default:
-                assert_not_reached("timeout in invalid state");
-        }
-
-        return 0;
-}
-
-static int pppoe_tag_parse_binary(struct pppoe_tag *tag, uint8_t **ret, size_t *length) {
-        uint8_t *data;
-
-        assert(ret);
-        assert(length);
-
-        data = memdup(tag->tag_data, PPPOE_TAG_LENGTH(tag));
-        if (!data)
-                return -ENOMEM;
-
-        free(*ret);
-        *ret = data;
-        *length = PPPOE_TAG_LENGTH(tag);
-
-        return 0;
-}
-
-static int pppoe_tag_parse_string(struct pppoe_tag *tag, char **ret) {
-        char *string;
-
-        assert(ret);
-
-        string = strndup(tag->tag_data, PPPOE_TAG_LENGTH(tag));
-        if (!string)
-                return -ENOMEM;
-
-        free(*ret);
-        *ret = string;
-
-        return 0;
-}
-
-static int pppoe_payload_parse(PPPoETags *tags, struct pppoe_hdr *header) {
-        struct pppoe_tag *tag;
-        int r;
-
-        assert(tags);
-
-        pppoe_tags_clear(tags);
-
-        PPPOE_TAGS_FOREACH(tag, header) {
-                switch (PPPOE_TAG_TYPE(tag)) {
-                case PTT_SRV_NAME:
-                        r = pppoe_tag_parse_string(tag, &tags->service_name);
-                        if (r < 0)
-                                return r;
-
-                        break;
-                case PTT_AC_NAME:
-                        r = pppoe_tag_parse_string(tag, &tags->ac_name);
-                        if (r < 0)
-                                return r;
-
-                        break;
-                case PTT_HOST_UNIQ:
-                        r = pppoe_tag_parse_binary(tag, &tags->host_uniq, &tags->host_uniq_len);
-                        if (r < 0)
-                                return r;
-
-                        break;
-                case PTT_AC_COOKIE:
-                        r = pppoe_tag_parse_binary(tag, &tags->cookie, &tags->cookie_len);
-                        if (r < 0)
-                                return r;
-
-                        break;
-                case PTT_SRV_ERR:
-                case PTT_SYS_ERR:
-                case PTT_GEN_ERR:
-                {
-                        _cleanup_free_ char *error = NULL;
-
-                        /* TODO: do something more sensible with the error messages */
-                        r = pppoe_tag_parse_string(tag, &error);
-                        if (r < 0)
-                                return r;
-
-                        if (strlen(error) > 0 && utf8_is_valid(error))
-                                log_debug("PPPoE: error - '%s'", error);
-                        else
-                                log_debug("PPPoE: error");
-
-                        break;
-                }
-                default:
-                        log_debug("PPPoE: ignoring unknown PPPoE tag type: 0x%.2x", PPPOE_TAG_TYPE(tag));
-                }
-        }
-
-        return 0;
-}
-
-static int pppoe_open_pppoe_socket(sd_pppoe *ppp) {
-        int s;
-
-        assert(ppp);
-        assert(ppp->pppoe_fd == -1);
-
-        s = socket(AF_PPPOX, SOCK_STREAM, 0);
-        if (s < 0)
-                return -errno;
-
-        ppp->pppoe_fd = s;
-
-        return 0;
-}
-
-static int pppoe_connect_pppoe_socket(sd_pppoe *ppp) {
-        union sockaddr_union_pppox link = {
-                .pppox = {
-                        .sa_family = AF_PPPOX,
-                        .sa_protocol = PX_PROTO_OE,
-                },
-        };
-        int r, channel;
-
-        assert(ppp);
-        assert(ppp->pppoe_fd != -1);
-        assert(ppp->session_id);
-        assert(ppp->ifname);
-
-        link.pppox.sa_addr.pppoe.sid = ppp->session_id;
-        memcpy(link.pppox.sa_addr.pppoe.dev, ppp->ifname, strlen(ppp->ifname));
-        memcpy(link.pppox.sa_addr.pppoe.remote, &ppp->peer_mac, ETH_ALEN);
-
-        r = connect(ppp->pppoe_fd, &link.sa, sizeof(link.pppox));
-        if (r < 0)
-                return r;
-
-        r = ioctl(ppp->pppoe_fd, PPPIOCGCHAN, &channel);
-        if (r < 0)
-                return -errno;
-
-        ppp->channel = channel;
-
-        return 0;
-}
-
-static int pppoe_handle_message(sd_pppoe *ppp, struct pppoe_hdr *packet, struct ether_addr *mac) {
-        int r;
-
-        assert(packet);
-
-        if (packet->ver != 0x1 || packet->type != 0x1)
-                return 0;
-
-        r = pppoe_payload_parse(&ppp->tags, packet);
-        if (r < 0)
-                return 0;
-
-        switch (ppp->state) {
-        case PPPOE_STATE_INITIALIZING:
-                if (packet->code != PADO_CODE)
-                        return 0;
-
-                if (ppp->tags.host_uniq_len != sizeof(ppp->host_uniq) ||
-                    memcmp(ppp->tags.host_uniq, &ppp->host_uniq, sizeof(ppp->host_uniq)) != 0)
-                        return 0;
-
-                log_debug("PPPoE: got OFFER (Peer: "
-                  "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx; "
-                  "Service-Name: '%s'; AC-Name: '%s')",
-                  mac->ether_addr_octet[0],
-                  mac->ether_addr_octet[1],
-                  mac->ether_addr_octet[2],
-                  mac->ether_addr_octet[3],
-                  mac->ether_addr_octet[4],
-                  mac->ether_addr_octet[5],
-                  strempty(ppp->tags.service_name),
-                  strempty(ppp->tags.ac_name));
-
-                memcpy(&ppp->peer_mac, mac, ETH_ALEN);
-
-                r = pppoe_open_pppoe_socket(ppp);
-                if (r < 0) {
-                        log_warning("PPPoE: could not open socket");
-                        return r;
-                }
-
-                r = pppoe_send_request(ppp);
-                if (r < 0)
-                        return 0;
-
-                ppp->state = PPPOE_STATE_REQUESTING;
-
-                break;
-        case PPPOE_STATE_REQUESTING:
-                if (packet->code != PADS_CODE)
-                        return 0;
-
-                if (ppp->tags.host_uniq_len != sizeof(ppp->host_uniq) ||
-                    memcmp(ppp->tags.host_uniq, &ppp->host_uniq,
-                           sizeof(ppp->host_uniq)) != 0)
-                        return 0;
-
-                if (memcmp(&ppp->peer_mac, mac, ETH_ALEN) != 0)
-                        return 0;
-
-                ppp->session_id = packet->sid;
-
-                log_debug("PPPoE: got CONFIRMATION (Session ID: %"PRIu16")",
-                          be16toh(ppp->session_id));
-
-                r = pppoe_connect_pppoe_socket(ppp);
-                if (r < 0) {
-                        log_warning("PPPoE: could not connect socket");
-                        return r;
-                }
-
-                ppp->state = PPPOE_STATE_RUNNING;
-
-                ppp->timeout = sd_event_source_unref(ppp->timeout);
-                assert(ppp->cb);
-                ppp->cb(ppp, SD_PPPOE_EVENT_RUNNING, ppp->userdata);
-
-                break;
-        case PPPOE_STATE_RUNNING:
-                if (packet->code != PADT_CODE)
-                        return 0;
-
-                if (memcmp(&ppp->peer_mac, mac, ETH_ALEN) != 0)
-                        return 0;
-
-                if (ppp->session_id != packet->sid)
-                        return 0;
-
-                log_debug("PPPoE: got TERMINATE");
-
-                ppp->state = PPPOE_STATE_STOPPED;
-
-                assert(ppp->cb);
-                ppp->cb(ppp, SD_PPPOE_EVENT_STOPPED, ppp->userdata);
-
-                break;
-        case PPPOE_STATE_STOPPED:
-                break;
-        default:
-                assert_not_reached("PPPoE: invalid state when receiving message");
-        }
-
-        return 0;
-}
-
-static int pppoe_receive_message(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
-        sd_pppoe *ppp = userdata;
-        _cleanup_free_ struct pppoe_hdr *packet = NULL;
-        union sockaddr_union link = {};
-        socklen_t addrlen = sizeof(link);
-        int buflen = 0, len, r;
-
-        assert(ppp);
-        assert(fd != -1);
-
-        r = ioctl(fd, FIONREAD, &buflen);
-        if (r < 0)
-                return r;
-
-        if (buflen < 0)
-                /* this can't be right */
-                return -EIO;
-
-        packet = malloc0(buflen);
-        if (!packet)
-                return -ENOMEM;
-
-        len = recvfrom(fd, packet, buflen, 0, &link.sa, &addrlen);
-        if (len < 0) {
-                log_warning_errno(r, "PPPoE: could not receive message from raw socket: %m");
-                return 0;
-        } else if ((size_t)len < sizeof(struct pppoe_hdr))
-                return 0;
-        else if ((size_t)len != sizeof(struct pppoe_hdr) + PPPOE_PACKET_LENGTH(packet))
-                return 0;
-
-        if (link.ll.sll_halen != ETH_ALEN)
-                /* not ethernet? */
-                return 0;
-
-        r = pppoe_handle_message(ppp, packet, (struct ether_addr*)&link.ll.sll_addr);
-        if (r < 0)
-                return r;
-
-        return 1;
-}
-
-int sd_pppoe_start(sd_pppoe *ppp) {
-        union sockaddr_union link = {
-                .ll = {
-                        .sll_family = AF_PACKET,
-                        .sll_protocol = htons(ETH_P_PPP_DISC),
-                },
-        };
-        _cleanup_close_ int s = -1;
-        _cleanup_event_source_unref_ sd_event_source *io = NULL;
-        int r;
-
-        assert_return(ppp, -EINVAL);
-        assert_return(ppp->fd == -1, -EBUSY);
-        assert_return(!ppp->io, -EBUSY);
-        assert_return(ppp->ifindex > 0, -EUNATCH);
-        assert_return(ppp->ifname, -EUNATCH);
-        assert_return(ppp->event, -EUNATCH);
-        assert_return(ppp->cb, -EUNATCH);
-
-        s = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
-        if (s < 0)
-                return -errno;
-
-        link.ll.sll_ifindex = ppp->ifindex;
-
-        r = bind(s, &link.sa, sizeof(link.ll));
-        if (r < 0)
-                return r;
-
-        r = sd_event_add_io(ppp->event, &io,
-                            s, EPOLLIN, pppoe_receive_message,
-                            ppp);
-        if (r < 0)
-                return r;
-
-        r = sd_event_source_set_priority(io, ppp->event_priority);
-        if (r < 0)
-                return r;
-
-        ppp->fd = s;
-        s = -1;
-        ppp->io = io;
-        io = NULL;
-
-        r = pppoe_send_initiation(ppp);
-        if (r < 0)
-                return r;
-
-        ppp->state = PPPOE_STATE_INITIALIZING;
-
-        return 0;
-}
-
-int sd_pppoe_stop(sd_pppoe *ppp) {
-        assert_return(ppp, -EINVAL);
-
-        if (ppp->state == PPPOE_STATE_RUNNING)
-                pppoe_send_terminate(ppp);
-
-        ppp->io = sd_event_source_unref(ppp->io);
-        ppp->timeout = sd_event_source_unref(ppp->timeout);
-        ppp->fd = asynchronous_close(ppp->fd);
-        ppp->pppoe_fd = asynchronous_close(ppp->pppoe_fd);
-
-        return 0;
-}