cregit-Linux how code gets into the kernel

Release 4.8 net/x25/x25_dev.c

Directory: net/x25
 *      X.25 Packet Layer release 002
 *      This is ALPHA test software. This code may break your machine, randomly fail to work with new
 *      releases, misbehave and/or generally screw up. It might even work.
 *      This code REQUIRES 2.1.15 or higher
 *      This module:
 *              This module is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *      History
 *      X.25 001        Jonathan Naylor Started coding.
 *      2000-09-04      Henner Eisen    Prevent freeing a dangling skb.

#define pr_fmt(fmt) "X25: " fmt

#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <linux/if_arp.h>
#include <net/x25.h>
#include <net/x25device.h>

static int x25_receive_data(struct sk_buff *skb, struct x25_neigh *nb) { struct sock *sk; unsigned short frametype; unsigned int lci; if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) return 0; frametype = skb->data[2]; lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); /* * LCI of zero is always for us, and its always a link control * frame. */ if (lci == 0) { x25_link_control(skb, nb, frametype); return 0; } /* * Find an existing socket. */ if ((sk = x25_find_socket(lci, nb)) != NULL) { int queued = 1; skb_reset_transport_header(skb); bh_lock_sock(sk); if (!sock_owned_by_user(sk)) { queued = x25_process_rx_frame(sk, skb); } else { queued = !sk_add_backlog(sk, skb, sk->sk_rcvbuf); } bh_unlock_sock(sk); sock_put(sk); return queued; } /* * Is is a Call Request ? if so process it. */ if (frametype == X25_CALL_REQUEST) return x25_rx_call_request(skb, nb, lci); /* * Its not a Call Request, nor is it a control frame. * Can we forward it? */ if (x25_forward_data(lci, nb, skb)) { if (frametype == X25_CLEAR_CONFIRMATION) { x25_clear_forward_by_lci(lci); } kfree_skb(skb); return 1; } /* x25_transmit_clear_request(nb, lci, 0x0D); */ if (frametype != X25_CLEAR_CONFIRMATION) pr_debug("x25_receive_data(): unknown frame type %2x\n",frametype); return 0; }


andrew hendryandrew hendry4015.69%212.50%
matthew daleymatthew daley135.10%16.25%
arnaldo carvalho de meloarnaldo carvalho de melo83.14%212.50%
andrew mortonandrew morton62.35%16.25%
eric dumazeteric dumazet41.57%16.25%
yi zhuyi zhu41.57%212.50%
benjamin lahaisebenjamin lahaise31.18%16.25%
wang weidongwang weidong10.39%16.25%

int x25_lapb_receive_frame(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype, struct net_device *orig_dev) { struct sk_buff *nskb; struct x25_neigh *nb; if (!net_eq(dev_net(dev), &init_net)) goto drop; nskb = skb_copy(skb, GFP_ATOMIC); if (!nskb) goto drop; kfree_skb(skb); skb = nskb; /* * Packet received from unrecognised device, throw it away. */ nb = x25_get_neigh(dev); if (!nb) { pr_debug("unknown neighbour - %s\n", dev->name); goto drop; } if (!pskb_may_pull(skb, 1)) return 0; switch (skb->data[0]) { case X25_IFACE_DATA: skb_pull(skb, 1); if (x25_receive_data(skb, nb)) { x25_neigh_put(nb); goto out; } break; case X25_IFACE_CONNECT: x25_link_established(nb); break; case X25_IFACE_DISCONNECT: x25_link_terminated(nb); break; } x25_neigh_put(nb); drop: kfree_skb(skb); out: return 0; }


david s. millerdavid s. miller3317.01%214.29%
arnaldo carvalho de meloarnaldo carvalho de melo3317.01%17.14%
matthew daleymatthew daley136.70%17.14%
eric w. biedermaneric w. biederman94.64%17.14%
hideaki yoshifujihideaki yoshifuji84.12%214.29%
andrew hendryandrew hendry31.55%17.14%
wang weidongwang weidong21.03%17.14%

void x25_establish_link(struct x25_neigh *nb) { struct sk_buff *skb; unsigned char *ptr; switch (nb->dev->type) { case ARPHRD_X25: if ((skb = alloc_skb(1, GFP_ATOMIC)) == NULL) { pr_err("x25_dev: out of memory\n"); return; } ptr = skb_put(skb, 1); *ptr = X25_IFACE_CONNECT; break; #if IS_ENABLED(CONFIG_LLC) case ARPHRD_ETHER: return; #endif default: return; } skb->protocol = htons(ETH_P_X25); skb->dev = nb->dev; dev_queue_xmit(skb); }


arnaldo carvalho de meloarnaldo carvalho de melo32.80%116.67%
andrew hendryandrew hendry10.93%116.67%
igor maravicigor maravic10.93%116.67%
wang weidongwang weidong10.93%116.67%

void x25_terminate_link(struct x25_neigh *nb) { struct sk_buff *skb; unsigned char *ptr; #if IS_ENABLED(CONFIG_LLC) if (nb->dev->type == ARPHRD_ETHER) return; #endif if (nb->dev->type != ARPHRD_X25) return; skb = alloc_skb(1, GFP_ATOMIC); if (!skb) { pr_err("x25_dev: out of memory\n"); return; } ptr = skb_put(skb, 1); *ptr = X25_IFACE_DISCONNECT; skb->protocol = htons(ETH_P_X25); skb->dev = nb->dev; dev_queue_xmit(skb); }


arnaldo carvalho de meloarnaldo carvalho de melo2825.93%116.67%
wang weidongwang weidong10.93%116.67%
igor maravicigor maravic10.93%116.67%
andrew hendryandrew hendry10.93%116.67%

void x25_send_frame(struct sk_buff *skb, struct x25_neigh *nb) { unsigned char *dptr; skb_reset_network_header(skb); switch (nb->dev->type) { case ARPHRD_X25: dptr = skb_push(skb, 1); *dptr = X25_IFACE_DATA; break; #if IS_ENABLED(CONFIG_LLC) case ARPHRD_ETHER: kfree_skb(skb); return; #endif default: kfree_skb(skb); return; } skb->protocol = htons(ETH_P_X25); skb->dev = nb->dev; dev_queue_xmit(skb); }


arnaldo carvalho de meloarnaldo carvalho de melo66.06%228.57%
andrew hendryandrew hendry11.01%114.29%
igor maravicigor maravic11.01%114.29%

Overall Contributors

arnaldo carvalho de meloarnaldo carvalho de melo789.81%310.00%
andrew hendryandrew hendry496.16%310.00%
david s. millerdavid s. miller334.15%26.67%
matthew daleymatthew daley263.27%13.33%
wang weidongwang weidong121.51%13.33%
hideaki yoshifujihideaki yoshifuji91.13%310.00%
eric w. biedermaneric w. biederman91.13%13.33%
andrew mortonandrew morton60.75%13.33%
eric dumazeteric dumazet40.50%13.33%
yi zhuyi zhu40.50%26.67%
tejun heotejun heo30.38%13.33%
benjamin lahaisebenjamin lahaise30.38%13.33%
igor maravicigor maravic30.38%13.33%
Directory: net/x25
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