cregit-Linux how code gets into the kernel

Release 4.11 net/netlink/diag.c

Directory: net/netlink
#include <linux/module.h>

#include <net/sock.h>
#include <linux/netlink.h>
#include <linux/sock_diag.h>
#include <linux/netlink_diag.h>
#include <linux/rhashtable.h>

#include "af_netlink.h"


static int sk_diag_dump_groups(struct sock *sk, struct sk_buff *nlskb) { struct netlink_sock *nlk = nlk_sk(sk); if (nlk->groups == NULL) return 0; return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups), nlk->groups); }

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Andrey Vagin56100.00%1100.00%
Total56100.00%1100.00%


static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct netlink_diag_req *req, u32 portid, u32 seq, u32 flags, int sk_ino) { struct nlmsghdr *nlh; struct netlink_diag_msg *rep; struct netlink_sock *nlk = nlk_sk(sk); nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep), flags); if (!nlh) return -EMSGSIZE; rep = nlmsg_data(nlh); rep->ndiag_family = AF_NETLINK; rep->ndiag_type = sk->sk_type; rep->ndiag_protocol = sk->sk_protocol; rep->ndiag_state = sk->sk_state; rep->ndiag_ino = sk_ino; rep->ndiag_portid = nlk->portid; rep->ndiag_dst_portid = nlk->dst_portid; rep->ndiag_dst_group = nlk->dst_group; sock_diag_save_cookie(sk, rep->ndiag_cookie); if ((req->ndiag_show & NDIAG_SHOW_GROUPS) && sk_diag_dump_groups(sk, skb)) goto out_nlmsg_trim; if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) && sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO)) goto out_nlmsg_trim; nlmsg_end(skb, nlh); return 0; out_nlmsg_trim: nlmsg_cancel(skb, nlh); return -EMSGSIZE; }

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Andrey Vagin22198.66%150.00%
Johannes Berg31.34%150.00%
Total224100.00%2100.00%


static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, int protocol, int s_num) { struct rhashtable_iter *hti = (void *)cb->args[2]; struct netlink_table *tbl = &nl_table[protocol]; struct net *net = sock_net(skb->sk); struct netlink_diag_req *req; struct netlink_sock *nlsk; struct sock *sk; int num = 2; int ret = 0; req = nlmsg_data(cb->nlh); if (s_num > 1) goto mc_list; num--; if (!hti) { hti = kmalloc(sizeof(*hti), GFP_KERNEL); if (!hti) return -ENOMEM; cb->args[2] = (long)hti; } if (!s_num) rhashtable_walk_enter(&tbl->hash, hti); ret = rhashtable_walk_start(hti); if (ret == -EAGAIN) ret = 0; if (ret) goto stop; while ((nlsk = rhashtable_walk_next(hti))) { if (IS_ERR(nlsk)) { ret = PTR_ERR(nlsk); if (ret == -EAGAIN) { ret = 0; continue; } break; } sk = (struct sock *)nlsk; if (!net_eq(sock_net(sk), net)) continue; if (sk_diag_fill(sk, skb, req, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, NLM_F_MULTI, sock_i_ino(sk)) < 0) { ret = 1; break; } } stop: rhashtable_walk_stop(hti); if (ret) goto done; rhashtable_walk_exit(hti); num++; mc_list: read_lock(&nl_table_lock); sk_for_each_bound(sk, &tbl->mc_list) { if (sk_hashed(sk)) continue; if (!net_eq(sock_net(sk), net)) continue; if (num < s_num) { num++; continue; } if (sk_diag_fill(sk, skb, req, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, NLM_F_MULTI, sock_i_ino(sk)) < 0) { ret = 1; break; } num++; } read_unlock(&nl_table_lock); done: cb->args[0] = num; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Andrey Vagin23253.46%133.33%
Herbert Xu18542.63%133.33%
Thomas Graf173.92%133.33%
Total434100.00%3100.00%


static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) { struct netlink_diag_req *req; int s_num = cb->args[0]; int err = 0; req = nlmsg_data(cb->nlh); if (req->sdiag_protocol == NDIAG_PROTO_ALL) { int i; for (i = cb->args[1]; i < MAX_LINKS; i++) { err = __netlink_diag_dump(skb, cb, i, s_num); if (err) break; s_num = 0; } cb->args[1] = i; } else { if (req->sdiag_protocol >= MAX_LINKS) return -ENOENT; err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num); } return err < 0 ? err : skb->len; }

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PersonTokensPropCommitsCommitProp
Andrey Vagin11677.33%150.00%
Herbert Xu3422.67%150.00%
Total150100.00%2100.00%


static int netlink_diag_dump_done(struct netlink_callback *cb) { struct rhashtable_iter *hti = (void *)cb->args[2]; if (cb->args[0] == 1) rhashtable_walk_exit(hti); kfree(hti); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu4486.27%133.33%
Andrey Vagin611.76%133.33%
Thomas Graf11.96%133.33%
Total51100.00%3100.00%


static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) { int hdrlen = sizeof(struct netlink_diag_req); struct net *net = sock_net(skb->sk); if (nlmsg_len(h) < hdrlen) return -EINVAL; if (h->nlmsg_flags & NLM_F_DUMP) { struct netlink_dump_control c = { .dump = netlink_diag_dump, .done = netlink_diag_dump_done, }; return netlink_dump_start(net->diag_nlsk, skb, h, &c); } else return -EOPNOTSUPP; }

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Andrey Vagin9194.79%150.00%
Herbert Xu55.21%150.00%
Total96100.00%2100.00%

static const struct sock_diag_handler netlink_diag_handler = { .family = AF_NETLINK, .dump = netlink_diag_handler_dump, };
static int __init netlink_diag_init(void) { return sock_diag_register(&netlink_diag_handler); }

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Andrey Vagin16100.00%1100.00%
Total16100.00%1100.00%


static void __exit netlink_diag_exit(void) { sock_diag_unregister(&netlink_diag_handler); }

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Andrey Vagin15100.00%1100.00%
Total15100.00%1100.00%

module_init(netlink_diag_init); module_exit(netlink_diag_exit); MODULE_LICENSE("GPL"); MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);

Overall Contributors

PersonTokensPropCommitsCommitProp
Andrey Vagin81473.60%120.00%
Herbert Xu26824.23%120.00%
Thomas Graf211.90%240.00%
Johannes Berg30.27%120.00%
Total1106100.00%5100.00%
Directory: net/netlink
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